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CN110039839B - Laminated non-woven fabric for protective clothing and manufacturing method and application thereof - Google Patents

Laminated non-woven fabric for protective clothing and manufacturing method and application thereof Download PDF

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Publication number
CN110039839B
CN110039839B CN201810038969.6A CN201810038969A CN110039839B CN 110039839 B CN110039839 B CN 110039839B CN 201810038969 A CN201810038969 A CN 201810038969A CN 110039839 B CN110039839 B CN 110039839B
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China
Prior art keywords
woven fabric
melt
layer
fabric
blown
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CN201810038969.6A
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Chinese (zh)
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CN110039839A (en
Inventor
高冬燕
吴蓓蓓
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Toray Fibers and Textiles Research Laboratories China Co Ltd
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Toray Fibers and Textiles Research Laboratories China Co Ltd
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Priority to CN201810038969.6A priority Critical patent/CN110039839B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention discloses a laminated non-woven fabric for protective clothing, and a manufacturing method and application thereof, wherein the laminated non-woven fabric comprises a surface non-woven fabric layer, an adhesive layer, an intermediate layer, an adhesive layer and an inner non-woven fabric layer, the intermediate layer is electret charged melt-blown non-woven fabric, the electret charged melt-blown non-woven fabric accounts for 10-40 wt% of the laminated non-woven fabric, and the oil-proof grade of the laminated non-woven fabric is more than grade 3. The laminated non-woven fabric for protective clothing has the characteristics of high trapping efficiency, high ventilation degree and high oil-proof level, and can be applied to the fields of garbage disposal, steel processing, nuclear power and clean rooms.

Description

Laminated non-woven fabric for protective clothing and manufacturing method and application thereof
Technical Field
The invention relates to a laminated non-woven fabric for protective clothing, a manufacturing method and application thereof.
Background
With the rapid development of Chinese economy, people's self-protection consciousness becomes higher and higher. In some working sites such as high-risk chemical substances, pesticide scattering, oil stains and the like, people wear various types of protective clothing according to the working environment of the site. In addition, in some places where dust is concentrated, such as garbage incineration places and maintenance operations of nuclear power stations, people wear protective clothing with high-concentration dust protection performance.
However, the protective clothing is applied to the fields of equipment maintenance, such as steel processing, automobile paint spraying and the like, and is mostly non-woven fabrics for protective clothing, which are manufactured by adopting a flash evaporation method technology, but the non-woven fabrics for protective clothing have low ventilation degree, are very stuffy when worn, generate serious uncomfortable feeling for people, and particularly have the risk of heatstroke when worn in summer when the temperature is high; in addition, in the occasion with more greasy dirt, paint and the like, the common protective clothing does not have the oil-proof function, so that the protective clothing is easy to be infiltrated by the greasy dirt when being worn for operation, and further the clothes inside the protective clothing are polluted.
As disclosed in japanese laid-open patent publication No. 2008-188925, a protective material is disclosed which has dust-proof and oil-stain-proof properties, but the fiber diameter constituting one layer of the protective material is too small, which results in poor air permeability of the resulting product, and the number of layers of the protective material is relatively large, the quality of laminated cloth is high, the finished garment made is heavy, and the operation is inconvenient when the worker wears the protective material.
As another example, chinese patent publication No. CN101358410 discloses a method for producing a medical polypropylene multi-layer nonwoven fabric, which has the characteristics of higher air permeability and better oil stain resistance, but the produced nonwoven fabric has poor trapping efficiency, thus not playing a role of dust protection, and is limited in use in some high dust occasions.
Disclosure of Invention
The invention aims to provide a laminated nonwoven fabric for protective clothing with high trapping efficiency, high ventilation and high oil-proof level and a manufacturing method thereof.
The technical scheme of the invention is as follows: the laminated non-woven fabric for the protective clothing comprises a surface non-woven fabric layer, an adhesive layer, a middle layer, an adhesive layer and an inner non-woven fabric layer, wherein the middle layer is a electret charged melt-blown non-woven fabric, the electret charged melt-blown non-woven fabric accounts for 10-40 wt% of the laminated non-woven fabric, and the oil-proof grade of the laminated non-woven fabric is more than grade 3.
The content of the single fibers constituting the electret charged melt-blown nonwoven fabric is preferably 50% by weight or more, with a fiber diameter of 1 to 8 μm.
The top layer is preferably a nonwoven fabric having a 3-4 layer structure.
The oil-repellent grade of the laminated nonwoven fabric of the present invention is preferably 5 or more.
The ventilation degree of the laminated nonwoven fabric of the present invention is preferably 40cm 3 /cm 2 And/s.
The efficiency of collecting polystyrene having a particle size of 0.3 to 0.5 μm by the laminated nonwoven fabric of the present invention is preferably 90% or more at a penetration wind speed of 0.6 m/min.
The invention has the beneficial effects that: compared with the prior laminated non-woven fabric for the protective clothing, the laminated non-woven fabric for the protective clothing has the characteristics of high trapping efficiency, high ventilation and high oil-proof level, and can be applied to the fields of garbage disposal, steel processing, nuclear power and clean rooms.
Detailed Description
The laminated non-woven fabric for the protective clothing comprises a surface non-woven fabric layer, an adhesive layer, a middle layer, an adhesive layer and an inner non-woven fabric layer, wherein the middle layer is a electret charged melt-blown non-woven fabric, the electret charged melt-blown non-woven fabric accounts for 10-40 wt% of the laminated non-woven fabric, and the oil-proof grade of the laminated non-woven fabric is more than grade 3. The surface layer non-woven fabric layer of the invention must contain more than 2 layers of non-woven fabrics with structures, which can ensure that the laminated non-woven fabric for protective clothing has higher strength, and the structure of the surface layer can be one of spun-bonded/spun-bonded (SS), spun-bonded/spun-bonded (SSS), spun-bonded/melt-blown/spun-bonded (SMS), spun-bonded/melt-blown/spun-bonded (SMMS), spun-bonded/melt-blown/spun-bonded (SSMMS). The structure of the top nonwoven layer is preferably spunbond/spunbond (SS) or spunbond/spunbond (SSs) in view of the high air permeability of the final laminated nonwoven. Considering the high oil-proof performance, more M layers are selected as much as possible, and if more M layers are used, the liquid-feeding rate of the agent after oil-proof treatment is high, and the oil-proof performance is better. The surface layer of the present invention preferably contains a nonwoven fabric having a 3-4 layer structure, which is one of spunbond/meltblown/spunbond (SMS), spunbond/spunbond (SSS), spunbond/spunbond (SSSs), and has both high air permeability and oil repellency.
In order to ensure that the laminated nonwoven fabric for protective clothing of the present invention works in the presence of oil stains, the surface layer nonwoven fabric is subjected to oil-repellent treatment. The nonwoven fabric constituting the intermediate layer is a melt-blown nonwoven fabric subjected to electret charge processing, so that the laminated nonwoven fabric for protective clothing of the present invention can be ensured to have excellent dust resistance and excellent air permeability. In order to ensure that the whole laminated nonwoven fabric is not too thick, the weight of the electret charged melt-blown nonwoven fabric must be controlled within a certain range, that is, the weight of the intermediate layer electret charged melt-blown nonwoven fabric is 10 to 40% by weight of the laminated nonwoven fabric. If the weight proportion of the melt-blown non-woven fabric subjected to electret charged processing in the middle layer is less than 10 weight percent, the gram weight of the melt-blown non-woven fabric is too low, the melt-blown non-woven fabric subjected to ultralow gram weight is difficult to process, the uniformity of the finished non-woven fabric is low, and the electrification performance of the obtained electret charged melt-blown non-woven fabric is also uneven when the electret processing is further carried out, so that the collection efficiency of dust of the obtained laminated non-woven fabric is low, and the effect of high collection efficiency is difficult to achieve, and therefore, the excellent dust resistance of the laminated non-woven fabric cannot be ensured; if the weight proportion of the melt-blown non-woven fabric processed by the electret charged processing of the middle layer is higher than 40 weight percent, the processing cost can be greatly increased on one hand, the diameter of single fibers is controlled in a certain range, the number of single fibers in a certain range can be certainly increased when the gram weight is increased, the density of the melt-blown non-woven fabric in a unit area becomes dense, the ventilation degree of the obtained laminated non-woven fabric can be reduced, the laminated non-woven fabric is very hot when worn, serious uncomfortable feeling is generated to people, and the risk of heatstroke can be caused when the protective clothing is worn particularly when the air temperature in summer is high. In view of the air permeability and trapping efficiency of the laminated nonwoven fabric for protective clothing, the weight of the melt-blown nonwoven fabric processed by the intermediate layer electret charged is preferably 20 to 30% by weight of the laminated nonwoven fabric.
The electret charged melt-blown nonwoven fabric of the present invention is formed by using ultrafine fibers having a small average fiber diameter and a narrow fiber diameter distribution, and therefore the obtained laminated nonwoven fabric is excellent in both collection efficiency and air permeability. Specifically, the content of the single fibers constituting the electret charged melt-blown nonwoven fabric, the fiber diameter of which is preferably 1 to 8 μm, is 50% by weight or more. If the diameter of the single fibers constituting the electret charged melt-blown nonwoven fabric is too small, the requirement on the fiber performance is too high, the manufacturing difficulty is increased, the cost is increased, and the finer the fibers are, the denser the nonwoven fabric is manufactured, and the ventilation of the obtained laminated nonwoven fabric is reduced; if the diameter of the filaments constituting the electret charged meltblown nonwoven fabric is too large, the diameter of the filaments increases, which results in an increase in the surface pore diameter of the meltblown nonwoven fabric layer, and thus, dust tends to penetrate the nonwoven fabric, and the collecting efficiency of the meltblown nonwoven fabric layer is greatly lowered, that is, the dust-proof performance is deteriorated. In consideration of the air permeability and the collection efficiency of the laminated nonwoven fabric, the fiber diameter constituting the electret charged meltblown nonwoven fabric is more preferably 4 to 8 μm.
The content of the single fibers having a fiber diameter of 1 to 8 μm constituting the electret charged melt-blown nonwoven fabric is preferably 50% by weight or more, and if the content of the single fibers having a fiber diameter of 1 to 8 μm is too low, the surface pore diameter of the resulting melt-blown nonwoven fabric layer is not uniform due to the uneven thickness among the fibers, and the pore diameter deviation is large, so that the produced laminated nonwoven fabric cannot achieve the effect of high collecting efficiency. In view of the fact that the higher the fiber content in the range of 1 to 8 μm, the more uniform and stable the fiber distribution, and the higher the collection efficiency, the content of the single fibers constituting the electret charged meltblown nonwoven fabric of 1 to 8 μm is more preferably 80% by weight or more.
The content of the single fibers having a fiber diameter of 18 to 22 μm constituting the top nonwoven fabric is preferably 70% by weight or more. The fiber diameter of the surface layer non-woven fabric directly influences the air permeability of the base fabric, and the finer the fiber diameter is, the more the number of fibers in unit area is, the denser the base fabric is, and the smaller the air permeability is; the thicker the fiber diameter, the fewer the number of fibers per unit area, the thinner the base cloth, and the greater the air permeability. If the content of the single fibers having a fiber diameter of 18 to 22 μm constituting the top nonwoven fabric is too low, the distribution of the fibers is dispersed and the concentration is low, and the physical properties of the formed top nonwoven fabric are very uneven, so that the ventilation of the whole roll of nonwoven fabric is high and the ventilation of the laminate formed by bonding the top nonwoven fabric is low, and the ventilation of the protective clothing is also uneven, and thus the ventilation of the protective clothing is deteriorated and serious stuffy feeling is generated when the protective clothing is worn.
The air permeability of the surface layer nonwoven fabric is preferably 80-200 cm 3 /cm 2 And/s. If the ventilation of the surface layer non-woven fabric is too low, the ventilation of the whole laminated non-woven fabric is reduced after the surface layer non-woven fabric, the middle layer electret charged melt-blown non-woven fabric and the inner layer non-woven fabric are bonded through hot melt adhesive, so that the ventilation of the manufactured protective clothing is poor, and serious stuffy uncomfortable feeling is generated when the protective clothing is worn; if the air permeability of the top layer nonwoven fabric is too high, the porosity of the surface increases, and when the oil-repellent treatment is performed, the adhesion rate of the chemical is low, and the oil-repellent performance is lowered, and if the high air permeability top layer nonwoven fabric is bonded to the middle layer electret charged meltblown nonwoven fabric by the adhesive, the adhesive permeates out of the top layer nonwoven fabric more easily, and the oil-repellent performance of the resulting laminated nonwoven fabric is greatly lowered, even without oil repellency.
The structure of the inner nonwoven layer of the present invention may be spunbond (S), spunbond/spunbond (SS), spunbond/spunbond (SSS), spunbond/meltblown/spunbond (SMS) one of spunbond/meltblown/spunbond (SMMS), spunbond/meltblown/spunbond (SMMMS), spunbond/meltblown/spunbond (SSMMS). The structure of the inner nonwoven layer is preferably spunbond (S) or spunbond/spunbond (SS) in view of the high air permeability of the final laminated nonwoven. In view of strength, spunbond/spunbond (SS) is preferable, and in view of both high air permeability and strength, the inner layer of the present invention preferably contains 2 layers of nonwoven fabric having a spunbond/spunbond (SS) structure.
The inner layer non-woven fabric of the invention can be water-proof and oil-proof treated or spun-bonded non-woven fabric without water-proof and oil-proof treatment. If the inner layer non-woven fabric is subjected to water-proof and oil-proof treatment, the oil penetration prevention performance of the laminated fabric can be enhanced, and the inner garment can be more effectively prevented from being stained due to oil stain penetration. If the inner layer non-woven fabric is not subjected to the water-proof and oil-proof treatment, the laminated cloth adhered with the non-woven fabric with high oil-proof performance on the surface layer can also keep high oil-proof effect, and the cost can be reduced if the inner layer non-woven fabric is not subjected to the oil-proof treatment.
The oil-resistant grade of the laminated nonwoven fabric of the invention is 3 or more. If the oil-proof grade of the laminated non-woven fabric of the protective clothing is less than 3 grades, oil stains can easily permeate in the high oil stain occasion, especially in the parts with concentrated stress such as elbows, knees and buttocks, the oil stains can easily permeate, and the clothes inside can be polluted. In consideration of ensuring good protection in high oil stain occasions, even at the position with concentrated stress, the penetration degree is small, the protection performance is good, and the oil-proof grade of the laminated non-woven fabric for the protective clothing is preferably more than 5 grades.
The laminated non-woven fabric contains two layers of adhesive, one layer of adhesive is arranged between a surface non-woven fabric layer and a middle electret charged melt-blown non-woven fabric layer, and the other layer of adhesive is arranged between a lining non-woven fabric layer and the middle electret charged melt-blown non-woven fabric layer.
The ventilation degree of the laminated nonwoven fabric of the present invention is preferably 40cm 3 /cm 2 And/s. The air permeability of the surface layer nonwoven fabric is preferably 80cm 3 /cm 2 The aeration degree of the intermediate layer electret charged melt-blown nonwoven fabric is preferably 200cm or more 3 /cm 2 The air permeability of the inner layer nonwoven fabric is preferably 300cm or more 3 /cm 2 At least/s, so that the ventilation degree of the laminated cloth height is ensured to be 40cm 3 /cm 2 At least/s, the high trapping efficiency and the high dust-proof performance of the laminated nonwoven fabric can be ensured.
The efficiency of collecting polystyrene having a particle size of 0.3 to 0.5 μm by the laminated nonwoven fabric of the present invention is preferably 90% or more at a penetration wind speed of 0.6 m/min. If the trapping efficiency is too low, the dust-proofing property of the laminated nonwoven fabric is low, and the effect of high dust-proofing cannot be achieved, and the laminated nonwoven fabric cannot be applied to the dust-proofing field.
The invention relates to a method for manufacturing laminated non-woven fabrics for protective clothing, which comprises the following steps:
(1) Preparing surface-inner layer non-woven fabrics: preparing a spun-bonded non-woven fabric through a spun-bonded processing technology, wherein the prepared spun-bonded non-woven fabric is used as one layer of non-woven fabric in the surface layer and the inner layer respectively; the spun-bonded non-woven fabric is prepared by heating and melting a high polymer, extruding the high polymer from a spinning hole into air through an extruder melt, cooling a melt trickle in the air, stretching and thinning at a certain speed to become long (air flow or mechanical action), thinning the high polymer melt at the stage, solidifying the high polymer melt at the same time, forming fibers, and forming a net;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: the spun-bonded non-woven fabric prepared in the step (1) is subjected to padding or spraying technology to prepare the spun-bonded non-woven fabric subjected to water and oil proofing processing;
(3) Preparing a middle electret charged melt-blown non-woven fabric: preparing melt-blown non-woven fabrics through a melt-blowing processing technology, then drying the prepared melt-blown non-woven fabrics through an electrostatic electret method at the temperature of 80-100 ℃ for 30-60 seconds to prepare electret charged melt-blown non-woven fabrics;
(4) Preparation of laminated nonwoven fabric: bonding the non-woven fabrics prepared in the steps (1), (2) and (3) in the sequence of surface non-woven fabrics/middle layer electret hot melt blown non-woven fabrics/inner layer non-woven fabrics by adopting an adhesive, and finally preparing a finished product; wherein, when the surface layer non-woven fabric and the middle layer electret charged melt-blown non-woven fabric are bonded, the adhesive-coated surface of the adhesive is the middle layer electret charged melt-blown non-woven fabric.
The water-and oil-repellent agent in the step (2) is composed of a mixture of a C6-series fluorine oil-repellent agent, a penetrating agent, a bridging agent and water. The penetrating agent is preferably alcohol penetrating agent, which is prepared by mixing polyoxyalkylene alkyl ether, dipropylene glycol, surfactant and water according to a certain proportion. The bridging agent takes blocked isocyanic acid as a main component, and mainly can lead the fluorine of the oil-proofing agent to be more uniformly arranged on the surface of the base cloth and enhance the oil proofing property. The post-finishing process comprises the following steps: immersing the surface layer non-woven fabric into the mixed liquid, rolling by a rolling machine, and drying by a shaping machine, or spraying the mixed liquid and drying by the shaping machine to obtain the waterproof and oil-proof surface layer non-woven fabric. The specific composition of the mixed solution is as follows: water and oil repellent agent: penetrant: and (3) a bridging agent: water= (15-20) g/L: (4-6) g/L: (8-15) g/L: (59-73) g/L. The bridging agent is added to strengthen the functions of the waterproof and oil-proof agent and the penetrating agent, so that the waterproof and oil-proof agent can be more uniformly distributed on the surface of the non-woven fabric, and a layer of uniform waterproof and oil-proof protective film is formed on the surface of the non-woven fabric, thereby improving the oil-proof performance of the laminated non-woven fabric.
The electret charged melt-blown nonwoven fabric prepared in the step (3) is obtained by an electrostatic electret method, wherein the electrostatic electret method comprises a high-voltage electret method or a water flow charged electret method. The melt-blown non-woven fabric treated by the static electret method can collect fine dust by means of static effect due to lasting static electricity, so that the melt-blown non-woven fabric has the advantages of high collecting efficiency, low filtering resistance and the like, and can play a role in dust prevention. If the middle layer adopts the common melt-blown non-woven fabric, the trapping efficiency and the service life of the common melt-blown non-woven fabric are not as good as those of the charged melt-blown non-woven fabric, because the common melt-blown non-woven fabric has a mechanical trapping effect on dust, namely, the dust is trapped through inertia, interception, gravity and diffusion effects, and the traditional mechanical trapping effect cannot meet the requirements of the current stage. If the common melt-blown nonwoven fabric is used to achieve the high trapping effect, only the gram weight and thickness of the nonwoven fabric are increased, but not only the amount of the material used is increased, but most importantly the air permeability of the nonwoven fabric is reduced.
In the step (3), the melt-blown non-woven fabric after the electrostatic electret method is dried at the temperature of 80-100 ℃ for 30-60 s, the drying temperature and the drying time are controlled within a certain range, and the drying temperature is lower than 80 ℃ or the drying time is shorter than 30s, so that the melt-blown non-woven fabric is insufficiently dried, a wet wrapping phenomenon can be generated after winding and packaging, and the product is easy to be polluted by microorganisms; the drying temperature is higher than 100 ℃ or the drying time exceeds 60 seconds, then the charged body on the surface of the melt-blown non-woven fabric is aggravated in molecular motion under the action of long-time high temperature, so that surface charge is arranged and distributed in disorder, the charging performance of the non-woven fabric is influenced, after the charging performance is poor, the trapping efficiency of the middle-layer charged melt-blown non-woven fabric is reduced, and the dustproof performance of the non-woven fabric for protective clothing is poor, and the using effect is influenced.
The adhesive coating mode in the step (4) is a spraying mode, and the first adhesive coating surface is one surface or two surfaces of the middle-layer electret charged melt-blown non-woven fabric. If the inner layer non-woven fabric is also subjected to oil-proof treatment, the glue spraying surface must be two surfaces of the middle layer electret charged melt-blown non-woven fabric, so that the degree of exudation of the hot melt glue to the oil-proof fabric surface can be effectively prevented, and the two surfaces can be ensured to have higher oil resistance. If the inner layer non-woven fabric is not subjected to oil-proof treatment, the glue spraying surface can be one surface of the middle layer electret charged melt-blown non-woven fabric or two surfaces of the middle layer electret charged melt-blown non-woven fabric, and when the glue spraying surface is one surface, the surface which is attached to the non-woven fabric subjected to oil-proof treatment of the surface layer is required to be sprayed with glue on the middle layer melt-blown non-woven fabric. And then integrating the surface layer non-woven fabric, the middle layer electret charged melt-blown non-woven fabric and the inner layer non-woven fabric in the sequence of the surface layer non-woven fabric, the middle layer electret charged melt-blown non-woven fabric and the inner layer non-woven fabric. If the adhesive is sprayed onto the surface of the surface layer nonwoven fabric subjected to the oil-repellent treatment according to the conventional process, the oil-repellent performance of the whole laminated nonwoven fabric is lowered. Since the surface layer nonwoven fabric is oil-repellent treated, the adhesive has good fluidity at high temperature, and is likely to ooze out of the surface layer nonwoven fabric, and the oil-repellent performance is greatly reduced. And if the adhesive is sprayed on the intermediate layer electret charged melt-blown non-woven fabric, then the adhesive is attached to the surface layer non-woven fabric, so that the exudation of the adhesive to the surface can be greatly slowed down.
The adhesive preferably has a melt viscosity of 1000mPa ･ s or more at 180℃in the rubber or olefin system. If the adhesive has too low a melting viscosity at 180 ℃, the adhesive has small melting viscosity and high thin fluidity at 180 ℃, and the adhesive easily oozes out of the surface layer base fabric during bonding, thereby easily reducing the oil-repellent performance of the surface layer nonwoven fabric. Meanwhile, after the adhesive with low viscosity and high fluidity is attached, the peel strength between the non-woven fabrics is low, the attachment between the non-woven fabrics is not firm, and the strength of the final laminated non-woven fabrics is reduced while the appearance is influenced.
The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples, and the method for measuring the physical properties of the laminated nonwoven fabric for protective clothing of the present invention is as follows.
[ fiber diameter ]
The nonwoven fabric was placed under an EM (digital microscope), the lens was adjusted to 1000 times, the width of the surface layer fiber of the nonwoven fabric was measured as the fiber diameter, and each sample was measured at least 20 times, and the average value was taken.
[ content of electret charged melt-blown nonwoven fabric in laminated nonwoven fabric ]
The size of each sample was measured before bonding by JIS L1096 for nonwoven fabrics of the front and back layers and electret charged melt-blown nonwoven fabrics: 200mm×200mm, sampling position: 3 samples are taken from the left, the center and the right of the width direction respectively, the weights of the 3 samples are tested respectively by an electronic balance after the laboratory is subjected to humidity adjustment for 24 hours at 20+/-2 ℃ multiplied by 65+/-4%, and the average value is calculated. The weight of the middle layer electret charged melt-blown non-woven fabric is A, B, C, the total weight of the adhesive sprayed on the two sides is D, and the proportion of the electret charged melt-blown non-woven fabric to the laminated non-woven fabric is calculated. The calculation formula is as follows: w=c/(a+b+c+d) ×100%.
[ general terms of ventilation ]
According to JIS L1096 8.27.1A method, placing the sample in a test area under no tension by FX-3300 air permeability tester, adjusting air pressure to 125Pa, obliquely moving the sample during test to obtain test points with different warps and wefts, testing each sample at least 5 times, and taking average value.
[ oil-repellent rating ]
According to the AATCC 118 oil repellency test, 1-8 grade oil repellency test reagents were prepared, about 20cm by 20cm of sample 3 pieces were collected, laid flat on a white filter paper with the sample facing up, placed on a smooth horizontal surface, and 5 drops (about 5mm in diameter or 0.05mL in volume) were carefully added dropwise to 5 sites representing the sample, with a spacing of about 4.0cm between the drops, starting with the grade 1 reagent. The pipette port should be kept at a height of about 0.6cm from the surface of the sample during the dripping without touching the sample. The droplets were observed at 45 ° for 30±2s and the presence or absence of penetration and diffusion of the reagent was observed. The oil repellency rating of the samples was judged according to A, B, C, D states defined by the standard.
[ trapping efficiency ]
Placing the laminated nonwoven fabric material to 0.1m 2 The filter material was fixed to a machine having an opening area, and the collection efficiency of the sample was calculated by measuring the number of air particles (particle diameter 0.3 to 0.5 μm) flowing up and down through the filter material by a particle counter (manufactured by RION Co., ltd.) by passing the sample through the machine at a surface wind speed of 0.6m/min, and the calculation formula was as follows:
The collection efficiency (%) =1- (downstream particle count/upstream particle count) ×100. Samples were taken at any 5 places in the assay sample and assayed to obtain an average.
Example 1
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 2
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 30/m through a melt-blowing processing technology 2 The obtained melt-blown nonwoven fabric is processed by water flow electrification, and then is fed at 90 ℃ for 60 secondsDrying to obtain a charged melt-blown non-woven fabric, wherein the content of polypropylene fibers with the diameters of 1-8 micrometers in the charged melt-blown non-woven fabric is 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to the surface oil-proof treatment, and finally obtaining the laminated non-woven fabric which is formed by sequentially carrying out surface non-woven fabric, adhesive, middle-layer electret charged melt-blown non-woven fabric, adhesive and inner-layer non-woven fabric, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 38%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 3
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 10g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: rubber adhesive with a melt viscosity of 5200mpa ･ s at 180 DEG CFirstly, bonding the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric, and spraying glue from the charged melt-blown non-woven fabric side of the manufactured bonding fabric towards a glue spraying opening, wherein the glue spraying amount of both sides is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to the surface oil-proof treatment, and finally obtaining the laminated non-woven fabric which is formed by sequentially carrying out surface non-woven fabric, adhesive, middle-layer electret charged melt-blown non-woven fabric, adhesive and inner-layer non-woven fabric, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 17%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 4
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 100 ℃ for 35 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are firstly bonded by adopting a rubber adhesive with the melt viscosity of 480mpa ･ s at 180 ℃, the charged melt-blown non-woven fabric surface side of the manufactured bonded fabric sprays rubber towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5g/m 2 Then bonding with the non-woven fabric with oil-proof surface layer to obtainThe content of the electret charged meltblown nonwoven fabric in the laminated nonwoven fabric was measured as 24% by the laminated nonwoven fabric of the order of the surface layer nonwoven fabric/adhesive/intermediate layer electret charged meltblown nonwoven fabric/adhesive/inner layer nonwoven fabric. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 5
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 100 ℃ for 35 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 10300mpa ･ s at 180 ℃, the charged melt-blown non-woven fabric surface side of the manufactured bonded fabric sprays glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 6
(1) Preparation of surface and inner layer non-woven fabrics: the surface layer spun-bonded/spun-bonded non-woven fabric (SS) and the inner layer spun-bonded/spun-bonded non-woven fabric (SS) are prepared by a spun-bonding processing technology, and the gram weight is 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/spunbond nonwoven fabric (SS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in the mixed solution formed by 59g/L, the oil-proof grade of 5 grade and the ventilation degree of 368cm are obtained through heat setting and drying treatment 3 /cm 2 SS nonwoven fabric of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 7
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SSMMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: impregnating the spunbond/meltblown/spunbond nonwoven fabric (SSMMS) produced in step (1) with an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof product with grade 7 and air permeability of 52cm 3 /cm 2 SSMMS nonwoven fabric of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 8
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: impregnating the spunbond/meltblown/spunbond nonwoven (SMS) produced in step (1) with an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 36%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 9
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Intermediate melt blown absencePreparing spinning cloth: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 53%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 24%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 10
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/spun-bonded non-woven fabric (SSSS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by a spun-bonding processing technology, and obtaining the weight of 40g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface and inner layer non-woven fabrics: immersing the spunbond/spunbond nonwoven fabrics (SSSS) and spunbond/spunbond nonwoven fabrics (SS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof product with grade 7 and air permeability of 100cm 3 /cm 2 SSSS nonwoven fabric of/s, oil-proof grade of 4 grade, air permeability of 380cm 3 /cm 2 SS nonwoven fabric of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 Is then subjected toThe prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameters of 1-8 micrometers in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to the surface oil-proof treatment, and finally obtaining the laminated non-woven fabric which is formed by sequentially carrying out surface non-woven fabric, adhesive, middle-layer electret charged melt-blown non-woven fabric, adhesive and inner-layer non-woven fabric, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 21%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
Example 11
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by a spun-bonding processing technology, and obtaining the weight of 40g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface and inner layer non-woven fabrics: immersing the spunbond/meltblown/spunbond nonwoven (SMMS) and spunbond/spunbond nonwoven (SS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof product with grade 7 and air permeability of 58cm 3 /cm 2 SMMS nonwoven fabric with oil resistance grade of 4 and air permeability of 380cm 3 /cm 2 SS nonwoven fabric of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The obtained melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to obtain the electrified melt-blown non-woven fabricSpinning cloth, wherein the content of polypropylene fibers with the diameter of 1-8 micrometers in the charged melt-blown non-woven fabric is 86 percent;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to the surface oil-proof treatment, and finally obtaining the laminated non-woven fabric which is formed by sequentially carrying out surface non-woven fabric, adhesive, middle-layer electret charged melt-blown non-woven fabric, adhesive and inner-layer non-woven fabric, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 21%. The physical properties of the laminated nonwoven fabric for protective clothing of the present invention are shown in Table 1.
The laminated nonwoven fabrics for protective clothing prepared in examples 1 to 11 are used in the fields of garbage disposal, steel processing, nuclear power and clean rooms.
Comparative example 1
(1) Preparing upper and lower non-woven fabrics: respectively preparing an upper layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lower layer spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing processes, and respectively preparing the compositions with gram weights of 30g/m 2 Upper nonwoven fabric of (2) and having a grammage of 15g/m 2 Is a lower layer non-woven fabric of the (a);
(2) Waterproof and oil-proof processing of the upper non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of laminated nonwoven fabric: the upper layer non-woven fabric and the lower layer non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃, and the glue spraying amount of both sides is 1.5g/m 2 Finally, a laminated nonwoven fabric was obtained in which the upper layer nonwoven fabric/adhesive agent/lower layer nonwoven fabric was used as the order, and the physical properties of the laminated nonwoven fabric are shown in Table 2.
Comparative example 2
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: bonding the non-woven fabrics prepared in the steps (1), (2) and (3) in the sequence of surface non-woven fabrics/adhesive/intermediate electret charged melt-blown non-woven fabrics/adhesive/inner non-woven fabrics by using a rubber adhesive with a melt viscosity of 5200mpa ･ s at 180 ℃, respectively spraying glue towards glue spraying openings on the surface and inner spun-bonded fabric sides, and bonding the non-woven fabrics with the intermediate charged melt-blown non-woven fabrics, wherein the glue spraying amounts of the two sides are respectively 1.5g/m 2 A laminated nonwoven fabric was produced, and the content of the electret charged melt-blown nonwoven fabric in the laminated nonwoven fabric was 24%. The physical properties of the laminated nonwoven fabric are shown in Table 2.
Comparative example 3
(1) Preparation of surface and inner layer non-woven fabrics: respectively preparing a surface layer spun-bonded/melt-blown/spun-bonded non-woven fabric (SMS) and a lining spun-bonded/spun-bonded non-woven fabric (SS) by spun-bonding and melt-blowing processing technology, and obtaining the gram weight of 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a lining layer of (2)A nonwoven fabric;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/meltblown/spunbond nonwoven fabric (SMS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L mixed solution, performing heat setting and drying treatment to obtain oil-proof grade 6 and ventilation degree 123cm 3 /cm 2 SMS nonwoven of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 40g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: the inner layer non-woven fabric and the middle layer charged melt-blown non-woven fabric are bonded by adopting a rubber adhesive with the melt viscosity of 5200mpa ･ s at 180 ℃ to obtain bonded fabric, the charged melt-blown non-woven fabric surface side of the bonded fabric is sprayed with glue towards a glue spraying opening, and the glue spraying amount of both surfaces is 1.5 g/m 2 And then bonding the laminated non-woven fabric with the non-woven fabric subjected to surface oil-proof treatment, and finally obtaining the laminated non-woven fabric with the surface non-woven fabric, the adhesive, the middle layer electret charged melt-blown non-woven fabric, the adhesive and the inner layer non-woven fabric in sequence, wherein the content of the electret charged melt-blown non-woven fabric in the laminated non-woven fabric is measured to be 45%. The physical properties of the laminated nonwoven fabric are shown in Table 2.
Comparative example 4
(1) Preparation of surface and inner layer non-woven fabrics: the surface layer spun-bonded/spun-bonded non-woven fabric (SS) and the inner layer spun-bonded/spun-bonded non-woven fabric (SS) are prepared by a spun-bonding processing technology, and the gram weight is 30g/m 2 Is a surface layer nonwoven fabric having a gram weight of 15g/m 2 Is a non-woven fabric of the inner layer;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: immersing the spunbond/spunbond nonwoven fabric (SS) produced in step (1) in an oil repellent treatment: penetrant: and (3) a bridging agent: water = 20g/L:6g/L:15g/L: in 59g/L of the mixed solution, the oil-proof grade is obtained through heat setting and drying treatmentGrade 5, ventilation degree of 368cm 3 /cm 2 SS nonwoven fabric of/s;
(3) Preparation of intermediate melt-blown nonwoven fabrics: the polypropylene fiber is adopted to prepare the polypropylene fiber with the gram weight of 15g/m through a melt-blowing processing technology 2 The prepared melt-blown non-woven fabric is processed by water flow electrification, and then is dried at the temperature of 90 ℃ for 60 seconds to prepare the electrified melt-blown non-woven fabric, and the content of polypropylene fibers with the diameter of 1-8 microns in the electrified melt-blown non-woven fabric is measured to be 86%;
(4) Preparation of laminated nonwoven fabric: bonding the non-woven fabrics prepared in the steps (1), (2) and (3) in the sequence of surface non-woven fabrics/adhesive/intermediate electret charged melt-blown non-woven fabrics/adhesive/inner non-woven fabrics by using a rubber adhesive with a melt viscosity of 5200mpa ･ s at 180 ℃, respectively spraying glue towards glue spraying openings on the surface and inner spun-bonded fabric sides, and bonding the non-woven fabrics with the intermediate charged melt-blown non-woven fabrics, wherein the glue spraying amounts of the two sides are respectively 1.5g/m 2 A laminated nonwoven fabric was produced, and the content of the electret charged melt-blown nonwoven fabric in the laminated nonwoven fabric was 24%. The physical properties of the laminated nonwoven fabric are shown in Table 2.
TABLE 1
TABLE 2
。
From the above table, (1) it is clear that under the same conditions, the proportion of the charged melt-blown nonwoven fabric in the example 2 to the laminated nonwoven fabric was high, and the collection efficiency of the obtained laminated nonwoven fabric was high, but the air permeability was low, whereas the proportion of the charged melt-blown nonwoven fabric in the example 1 to the laminated nonwoven fabric was in the preferable range, and the collection efficiency and air permeability of the obtained laminated nonwoven fabric were also high.
(2) As is clear from examples 4 and 5, under the same conditions, the melt viscosity of the hot-melt adhesive at 180℃in example 4 was 480mPa ･ s and the melt viscosity of the hot-melt adhesive at 180℃in example 5 was 10300mPa ･ s, and the oil repellency rating of the resulting laminated nonwoven fabric was lower than that of the latter.
(3) As is clear from examples 1 and 6, under the same conditions, the structure of the middle layer nonwoven fabric in example 1 was 3 layers, and the structure of the middle layer nonwoven fabric in example 6 was 2 layers, and the oil repellency grade of the laminated nonwoven fabric obtained by the former was significantly better than that of the latter.
(4) As is clear from examples 1 and 7, under the same conditions, the structure of the middle layer nonwoven fabric in example 1 is 3 layers, the structure of the middle layer nonwoven fabric in example 7 is 5 layers and the melt-blown layer is 2 layers, the oil repellency grade of the laminated nonwoven fabric obtained by the former is lower than that of the latter, but the air permeability of the laminated nonwoven fabric obtained by the former is significantly higher than that of the latter.
(5) As is clear from examples 1, 8 and 9, when the content of the single fibers having a fiber diameter of 1 to 8 μm in the electret charged meltblown nonwoven fabric of example 8 was too low under the same conditions, the collecting efficiency of the obtained laminated nonwoven fabric was low.
(6) As is clear from examples 10 and 11, the structure of the middle-layer nonwoven fabric in example 10 is 4 layers, and the structure of the middle-layer nonwoven fabric in example 11 is 4 layers, and when the structures of the middle-layer nonwoven fabrics are all 4 layers, the former is preferably a spun-bonded nonwoven fabric with a 4-layer structure, so that not only a relatively high air permeability but also a relatively high oil-repellent grade can be ensured.
(7) As is clear from example 1 and comparative example 1, comparative example 1 did not have an intermediate electret charged meltblown nonwoven layer, and the collection efficiency of the resulting laminated nonwoven was significantly lower than the former.
(8) As is clear from examples 1 and 2, and examples 6 and 4, the adhesive-sprayed surface of the hot melt adhesive was a spun-bonded nonwoven fabric having a surface layer oil-repellent treated under the same conditions, and the oil-repellent rating of the resulting laminated nonwoven fabric was significantly lower than that of the former.
(9) As is clear from example 1 and comparative example 3, the proportion of the charged melt-blown nonwoven fabric in the laminated nonwoven fabric in comparative example 3 was too high under the same conditions, and not only the processing cost was increased, but also the air permeability of the resultant laminated nonwoven fabric was significantly lower than that of the former.

Claims (7)

1. A laminated nonwoven fabric for protective clothing, characterized in that: the laminated non-woven fabric comprises a surface non-woven fabric layer, an adhesive layer, a middle layer, an adhesive layer and an inner non-woven fabric layer, wherein the middle layer is a electret charged melt-blown non-woven fabric, the electret charged melt-blown non-woven fabric accounts for 10-40 wt% of the laminated non-woven fabric, the surface layer is non-woven fabric with a 3-4 layer structure, the oil-proof grade of the laminated non-woven fabric is more than 5 grades, and the air permeability of the surface layer non-woven fabric is 80-200 cm 3 /cm 2 And/s, wherein the ventilation degree of the electret charged melt-blown non-woven fabric is 200cm 3 /cm 2 Above/s, the air permeability of the inner layer non-woven fabric is 300cm 3 /cm 2 And when the surface layer non-woven fabric and the middle layer electret charged melt-blown non-woven fabric are bonded, the adhesive-coated surface of the adhesive is the middle layer electret charged melt-blown non-woven fabric, the surface layer non-woven fabric layer is one of spun-bonded/melt-blown/spun-bonded, spun-bonded/spun-bonded and spun-bonded/spun-bonded, and the oil-proof grade of the surface layer non-woven fabric is 6-7 grades.
2. The laminated nonwoven fabric for protective clothing according to claim 1, wherein: the content of the single fibers with the fiber diameter of 1-8 micrometers constituting the electret charged melt-blown non-woven fabric is more than 50 weight percent.
3. The protective laminated nonwoven fabric according to claim 1 or 2, characterized in that: the air permeability of the laminated nonwoven fabric was 40cm 3 /cm 2 And/s.
4. The protective laminated nonwoven fabric according to claim 1 or 2, characterized in that: the laminated nonwoven fabric has a collection efficiency of 90% or more for polystyrene having a particle diameter of 0.3 to 0.5 [ mu ] m at a penetration wind speed of 0.6 m/min.
5. A method of producing the laminated nonwoven fabric for protective clothing according to claim 1, characterized by: the method comprises the following steps:
(1) Preparation of surface and inner layer non-woven fabrics: preparing a spun-bonded non-woven fabric through a spun-bonded processing technology, wherein the prepared spun-bonded non-woven fabric is used as one layer of non-woven fabric in the surface layer and the inner layer respectively;
(2) Waterproof and oil-proof processing of the surface layer non-woven fabric: the surface non-woven fabric prepared in the step (1) is subjected to padding or spraying technology to prepare the surface non-woven fabric subjected to water and oil proofing processing;
(3) Preparing a middle electret charged melt-blown non-woven fabric: preparing melt-blown non-woven fabrics through a melt-blowing processing technology, then drying the prepared melt-blown non-woven fabrics through an electrostatic electret method at the temperature of 80-100 ℃ for 30-60 seconds to prepare electret charged melt-blown non-woven fabrics;
(4) Preparation of laminated nonwoven fabric: bonding the non-woven fabrics prepared in the steps (1), (2) and (3) in the sequence of surface non-woven fabrics/middle layer electret hot melt blown non-woven fabrics/inner layer non-woven fabrics by adopting an adhesive, and finally preparing a finished product; wherein, when the surface layer non-woven fabric and the middle layer electret charged melt-blown non-woven fabric are bonded, the adhesive-coated surface of the adhesive is the middle layer electret charged melt-blown non-woven fabric.
6. The method for producing a laminated nonwoven fabric for protective clothing according to claim 5, wherein: the adhesive has a melt viscosity of 1000 mPas or more at 180 ℃.
7. Use of the laminated nonwoven fabric for protective clothing according to claim 1 in the fields of refuse disposal, steel processing, nuclear power, clean room.
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CN1439328A (en) * 2002-02-19 2003-09-03 可乐丽股份有限公司 Dust-collecting bags for electric dust cleaners
CN104342927A (en) * 2013-07-24 2015-02-11 东丽纤维研究所（中国）有限公司 Waterproof oil-proof antistatic non-woven fabric and producing method thereof
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CN104342927A (en) * 2013-07-24 2015-02-11 东丽纤维研究所（中国）有限公司 Waterproof oil-proof antistatic non-woven fabric and producing method thereof
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