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CN113492556A - Water-repellent breathable composite film, sanitary product and application - Google Patents

Water-repellent breathable composite film, sanitary product and application Download PDF

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Publication number
CN113492556A
CN113492556A CN202010189495.2A CN202010189495A CN113492556A CN 113492556 A CN113492556 A CN 113492556A CN 202010189495 A CN202010189495 A CN 202010189495A CN 113492556 A CN113492556 A CN 113492556A
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CN
China
Prior art keywords
thermoplastic resin
composite film
polytetrafluoroethylene
biaxially oriented
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010189495.2A
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Chinese (zh)
Inventor
李嘉
赵凡
李慧
杨帆
蔡醇洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhonghao Chenguang Research Institute of Chemical Industry Co Ltd
Original Assignee
Zhonghao Chenguang Research Institute of Chemical Industry Co Ltd
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Priority to CN202010189495.2A priority Critical patent/CN113492556A/en
Publication of CN113492556A publication Critical patent/CN113492556A/en
Pending legal-status Critical Current

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    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/496—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies in the form of pants or briefs
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • 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
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • 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
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • 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
    • B32B2307/726—Permeability to liquids, absorption
    • 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
    • B32B2555/00—Personal care

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention relates to the technical field of material processing, in particular to a water-repellent breathable composite film, a hygienic product and application. The water-repellent breathable composite film comprises breathable non-woven fabric and a thermoplastic resin biaxially oriented microporous film thermally compounded on the upper surface of the non-woven fabric. According to the water-repellent breathable composite film provided by the invention, the breathable non-woven fabric and the thermoplastic resin biaxially-oriented microporous film are thermally compounded, so that a framework is added to the thermoplastic resin biaxially-oriented microporous film, the elongation of micropores on the film is reduced, gas cannot be wrapped by the micropores when passing through the film, and the air permeability of the thermoplastic resin biaxially-oriented microporous film is enhanced.

Description

Water-repellent breathable composite film, sanitary product and application
Technical Field
The invention relates to the technical field of material processing, in particular to a water-repellent breathable composite film, a hygienic product and application.
Background
Paper diapers, paper urine pads, sanitary napkins, panty liners and the like are common sanitary products. Generally, sanitary articles consist of three main parts: surface coating layer, absorption core layer and bottom layer. The surface coating may also be referred to as a coating. The absorbent core layer may also be referred to as an absorbent core, or absorbent body. The bottom layer is the outermost structure of the sanitary product, has water impermeability, and can prevent water in the absorption core layer from seeping. The special non-woven fabric is comfortable to use on the bottom layer of many foreign sanitary articles such as paper diapers and sanitary towels. However, the special non-woven fabric is relatively high in price and general in water repellent function. The bottom layers of paper diapers, sanitary napkins and the like in domestic markets are generally polypropylene (PP) microporous films or Polyethylene (PE) microporous films. Typically the minimum diameter of the water droplets or mist is about 10 μm and the diameter of the water vapour molecules is about 0.4 nm. The microporous films realize that water drops cannot penetrate through but water vapor molecules can penetrate through by utilizing the size difference between the water drops and the water vapor molecules, so that the effects of water repellency and air permeability are achieved.
Patent document CN105326609A discloses an adult diaper. The paper diaper comprises a diaper, a front waist support and a rear waist support, wherein the diaper is arranged in the diaper and the like. The diaper comprises a non-woven fabric layer, an absorber layer and a polytetrafluoroethylene breathable layer, wherein the absorber layer and the polytetrafluoroethylene breathable layer are arranged in the non-woven fabric layer and are respectively connected with the non-woven fabric layer in a sewing mode.
The inventor discovers that the existing sewn and connected non-woven fabric layer and polytetrafluoroethylene breathable layer can achieve the purpose of water repellency and breathability, but due to the fact that the polytetrafluoroethylene breathable layer has high elongation, gas stretches when passing through micropores of the polytetrafluoroethylene breathable layer to wrap the gas, and then the gas passes through the micropores slowly, so that the air permeability is low, and the breathability is poor.
Disclosure of Invention
The invention aims to provide a water-repellent breathable composite film, a sanitary product and application, so as to improve the breathability of the water-repellent breathable composite material and the sanitary product.
The invention provides a water-repellent breathable composite film, which comprises a breathable non-woven fabric and a thermoplastic resin biaxially oriented microporous film thermally compounded on the upper surface of the non-woven fabric.
As a preferred embodiment, the thermoplastic resin biaxially oriented microporous film is laminated on the upper surface of the nonwoven fabric by hot pressing.
In a more preferable embodiment, the hot pressing temperature is 160-170 ℃, the drawing speed is 3-5m/min, and the hot pressing pressure is 0-0.2 MPa.
As a specific implementation scheme, the thermoplastic resin biaxially oriented microporous membrane and the non-woven fabric enter a hot press together through a guide roller for hot-pressing compounding, the temperature of the hot press is 160-170 ℃, the traction speed is 3-5m/min, the pressure of a rubber roller is 0-0.2MPa, and the composite material is coiled through a cooling roller to obtain the water-repellent breathable composite membrane.
In a preferred embodiment, the thermoplastic resin biaxially oriented microporous film has an average pore diameter of 0.1 to 2 μm and a porosity of 75 to 85%, preferably 80 to 85%.
In a preferred embodiment, the thickness of the thermoplastic resin biaxially oriented microporous film is 50 to 80 μm. The biaxially stretched microporous film of thermoplastic resin having the above characteristics has about 90 hundred million micropores per square inch.
As a preferred embodiment, the thermoplastic resin biaxially stretched microporous film has an antibacterial and/or bactericidal function. The surface of the thermoplastic resin biaxial stretching microporous membrane is modified by means of plasma treatment, electrostatic spraying and the like, or other functional substances are introduced, such as anions, so that the thermoplastic resin biaxial stretching microporous membrane has an antibacterial and/or bactericidal function.
In a specific embodiment, the thermoplastic resin biaxially oriented microporous membrane comprises polyethylene, polypropylene or polytetrafluoroethylene.
In a preferred embodiment, the thermoplastic resin biaxially oriented microporous membrane is made of polytetrafluoroethylene.
As a specific embodiment, the material of the air-permeable nonwoven fabric includes PP, PE, PTFE, etc. The air-permeable nonwoven fabric is prepared by extruding and stretching PP to form continuous filaments, laying the filaments into a web, and then bonding the web by itself, heat, chemical, or mechanical means to form the air-permeable nonwoven fabric.
As a specific embodiment, the thermoplastic resin biaxially stretched microporous film is produced by a method comprising the steps of:
mixing the liquid lubricant with the thermoplastic resin, curing, prepressing for forming, pushing and extruding, and rolling to prepare a thermoplastic resin base band;
and sequentially carrying out longitudinal stretching, transverse stretching and shaping on the thermoplastic resin base band to prepare the thermoplastic resin biaxial stretching microporous film.
As a more specific embodiment, the thermoplastic resin biaxially stretched microporous membrane is produced by a process comprising the steps of:
s1: mixing the liquid lubricant and the polytetrafluoroethylene dispersion resin in a weight ratio of 20: 80 to prepare a mixture; standing and curing the mixture for 24 hours at 55 ℃ to fully mix the resin and the liquid lubricant to obtain a cured mixture;
s2: prepressing and molding the cured mixture, and extruding the mixture into polytetrafluoroethylene bars by pushing;
s3: the polytetrafluoroethylene rod is rolled into a sheet in a rolling mill to obtain a polytetrafluoroethylene base belt, and the rolling speed of the rolling mill is 15-18 rpm;
s4: degreasing and drying the polytetrafluoroethylene base band in a degreasing oven, and processing into a degreased base band, wherein the degreasing temperature is 170 ℃, and the degreasing speed is 1-15 m/min;
s5: longitudinally stretching the degreased base belt in a longitudinal stretching oven to process the degreased base belt into a base film, wherein the longitudinal stretching temperature is 300 ℃;
s6: transversely stretching and expanding the obtained base film in a longitudinal stretching mode, and sintering and shaping to prepare a polytetrafluoroethylene biaxially oriented microporous film, wherein the transverse stretching temperature is 200 ℃, and the sintering and shaping temperature is 360 ℃;
s7: and (3) feeding the coiled porous membrane and the non-woven fabric into a hot press through a guide roller for hot-pressing compounding, wherein the temperature of the hot press is 160-170 ℃, the traction speed is 3-5m/min, and the coiled porous membrane and the non-woven fabric are coiled after compounding through a cooling roller to obtain the water-repellent breathable composite membrane.
As a preferred embodiment, the thermoplastic resin is a polytetrafluoroethylene dispersion resin.
As a preferred embodiment, the molecular weight of the polytetrafluoroethylene dispersion resin is 300 to 400 ten thousand.
Polytetrafluoroethylene dispersion resin, liquid lubricant and air-permeable nonwoven fabric used for preparing the thermoplastic resin biaxially oriented microporous film are commercially available. For example only, the polytetrafluoroethylene dispersion resin may be ptfe dispersion resin or dajin F106 from Miao Chen optical chemical research institute, Inc. For the liquid lubricant, Isopar G, an isoparaffin mineral spirit produced by Exxon Mobil may be used.
As a preferred embodiment, the composite film further comprises an absorbent core layer positioned over the thermoplastic resin biaxially stretched microporous film. After the absorption core layer absorbs liquid, such as urine or blood, due to the obstruction of the polytetrafluoroethylene biaxial stretching microporous film and the water repellent characteristic of polytetrafluoroethylene, liquid drops cannot be removed too much, water molecules and other gas molecules can pass through the micropores, and the comfort of users is improved.
As a preferred embodiment, the composite film further comprises a moisture absorption layer thermally composited between the nonwoven fabric and the thermoplastic resin biaxially oriented microporous film. The moisture-absorbing layer may be made of at least one of cotton, pulp or other natural fiber materials, etc. The hydrone through polytetrafluoroethylene biaxial stretching microporous membrane is absorbed by the hygroscopic layer after through, further gives off in the air, plays the ventilative effect of hydrofuge, takes away unnecessary heat, and is dry and comfortable, promotes the user and uses experience.
The water-repellent breathable composite film provided by the invention thermally compounds the breathable non-woven fabric and the thermoplastic resin biaxially oriented microporous film, adds a framework for the thermoplastic resin biaxially oriented microporous film, reduces the elongation of micropores on the thermoplastic resin biaxially oriented microporous film, prevents gas from being wrapped by the micropores when the gas passes through the microporous film, and enhances the air permeability of the thermoplastic resin biaxially oriented microporous film.
In a second aspect, the present invention provides the use of a composite film as described above in a hygiene article.
According to a third aspect of the invention, there is provided a sanitary article comprising a composite film as described above.
As a specific embodiment, the sanitary article includes a diaper, a diaper pad, a sanitary napkin, a panty liner, and the like.
The sanitary article provided by the invention not only can repel water, but also has high air permeability, and improves the comfort of users.
Drawings
Fig. 1 is a flow chart of a production process of the water-repellent breathable composite film provided by the invention.
FIG. 2 is an electron microscope image of the air-permeable nonwoven fabric.
FIG. 3 is an electron microscope image of a PTFE biaxially oriented microporous membrane.
Detailed Description
The present invention is further illustrated by the following examples, which should be understood as being merely illustrative of the present invention and not limiting thereof, and all simple modifications which are within the spirit of the invention are intended to be included within the scope of the invention as claimed.
Example 1
S1: the liquid lubricant (Exxon Mobil isoparaffin solvent oil Isopar G) and polytetrafluoroethylene dispersion resin (molecular weight 300-400 ten thousand, produced by Zhonghao Chenghuai research institute Co., Ltd.) were mixed in a weight ratio of 20: 80 to prepare a mixture. And standing and curing the mixture for 24 hours at the temperature of 55 ℃ to fully mix the resin and the liquid lubricant to obtain a cured mixture.
S2: and extruding the cured mixture into polytetrafluoroethylene rods by pushing, wherein the pushing compression ratio is 55.
S3: and (3) rolling the polytetrafluoroethylene rod into a sheet in a rolling mill to obtain the polytetrafluoroethylene base belt, wherein the rolling speed of the rolling mill is 18rpm, and the rolling thickness is 0.35-0.37 mm.
S4: degreasing and drying the polytetrafluoroethylene base band in a degreasing oven, and processing into a degreased base band, wherein the degreasing temperature is 170 ℃, and the degreasing speed is 3 m/min.
S5: and longitudinally stretching the degreased base tape in a longitudinal stretching oven to obtain the base film, wherein the longitudinal stretching temperature is 300 ℃, and the longitudinal stretching multiple and the longitudinal stretching speed are 4 times and 400 times.
S6: longitudinally stretching the obtained base film to perform transverse stretching and spreading and sintering and shaping to prepare the polytetrafluoroethylene biaxial stretching microporous film, wherein the transverse stretching temperature is 200 ℃, the transverse stretching multiple is 20 times, the sintering and shaping temperature is 360 ℃, and the polytetrafluoroethylene biaxial stretching microporous film is prepared, and has the thickness of 50-80 mu m, the pore diameter of 0.1-2 mu m and the porosity of 80%.
S7: referring to fig. 1, the coiled porous membrane and the breathable non-woven fabric enter a hot press together through a flattening guide roller to be subjected to hot-pressing compounding, the temperature of a heating roller is 170 ℃, the traction speed is 5m/min, and after compounding, the porous membrane and the breathable non-woven fabric are wound by a winding roller to obtain the water-repellent breathable composite membrane.
The water-repellent breathable composite film can be directly applied to the bottom layer of a hygienic product after being cut.
Example 2
S1: the liquid lubricant and the polytetrafluoroethylene dispersion resin are mixed according to the weight ratio of 20: 80 to prepare a mixture. Standing and curing the mixture for 24h at 55 ℃ to fully mix the resin and the liquid lubricant.
S2: and extruding the cured mixture into polytetrafluoroethylene rods by pushing, wherein the pushing compression ratio is 55.
S3: and (3) rolling the polytetrafluoroethylene rod into a sheet in a rolling mill to obtain the polytetrafluoroethylene base belt, wherein the rolling speed of the rolling mill is 15rpm, and the rolling thickness is 0.35-0.37 mm.
S4: degreasing and drying the polytetrafluoroethylene base band in a degreasing oven, and processing into a degreased base band, wherein the degreasing temperature is 170 ℃, and the degreasing speed is 5 m/min.
S5: and longitudinally stretching the degreased base tape in a longitudinal stretching oven to obtain the base film, wherein the longitudinal stretching temperature is 300 ℃, and the longitudinal stretching multiple and the longitudinal stretching speed are 5 times and 400 times.
S6: and longitudinally stretching the obtained base film to perform transverse stretching, spreading and sintering and shaping, wherein the transverse stretching temperature is 200 ℃, the transverse stretching multiple is 22 times, and then the sintering and shaping temperature is 360 ℃, so that the polytetrafluoroethylene biaxial stretching microporous film with the thickness of 50-80 mu m, the pore diameter of 0.1-1 mu m and the porosity of 80% is prepared.
S7: referring to fig. 1, the coiled porous membrane and the breathable non-woven fabric are fed into a hot press together through a flattening guide roller for hot-pressing compounding, the temperature of a heating roller is 165 ℃, the traction speed is 3m/min, the pressure of a rubber roller is 0.1MPa, the composite membrane is coiled through a cooling roller, and the water-repellent breathable composite membrane is obtained.
The water-repellent breathable composite film can be directly applied to the bottom layer of a hygienic product after being cut.
Example 3
S1: the liquid lubricant and the polytetrafluoroethylene dispersion resin are mixed according to the weight ratio of 20: 80 to prepare a mixture. Standing and curing the mixture for 24h at 55 ℃ to fully mix the resin and the liquid lubricant.
S2: and extruding the cured mixture into polytetrafluoroethylene rods by pushing, wherein the pushing compression ratio is 55.
S3: and (3) rolling the polytetrafluoroethylene rod into a sheet in a rolling mill to obtain the polytetrafluoroethylene base belt, wherein the rolling speed of the rolling mill is 18rpm, and the rolling thickness is 0.35-0.37 mm.
S4: degreasing and drying the polytetrafluoroethylene base band in a degreasing oven, and processing into a degreased base band, wherein the degreasing temperature is 170 ℃, and the degreasing speed is 5 m/min.
S5: and longitudinally stretching the degreased base tape in a longitudinal stretching oven to obtain the base film, wherein the longitudinal stretching temperature is 300 ℃, and the longitudinal stretching multiple and the longitudinal stretching speed are 6 times and 400 times.
S6: and longitudinally stretching the obtained base film to perform transverse stretching, spreading and sintering and shaping, wherein the transverse stretching temperature is 200 ℃, the transverse stretching multiple is 22 times, and then the sintering and shaping temperature is 360 ℃, so that the polytetrafluoroethylene biaxial stretching microporous film is prepared, and has the thickness of 50-80 mu m, the pore diameter of 0.1-1 mu m and the porosity of 85%.
S7: referring to fig. 1, the coiled porous membrane and the breathable non-woven fabric are fed into a hot press through a flattening guide roller for hot-pressing compounding, the temperature of a heating roller is 160 ℃, the traction speed is 3m/min, the pressure of a rubber roller is 0.1MPa, and after compounding, the porous membrane and the breathable non-woven fabric are wound through a cooling roller and a winding roller to obtain the water-repellent breathable composite membrane.
The water-repellent breathable composite film can be directly applied to the bottom layer of a hygienic product after being cut.
Test example
The water and air permeability of the air-permeable nonwoven fabric, the polytetrafluoroethylene biaxially oriented microporous film and the water-repellent air-permeable composite film of examples 1 to 3 were measured, and the results are shown in table 1.
Figure BDA0002415348150000071
Figure BDA0002415348150000081
The bubble point represents the pore diameter, the pore diameter is smaller when the bubble point is higher, and water molecules are less prone to pass through when the pore diameter is smaller; the air permeability represents the speed of gas passing through, and the smaller the air permeability is, the more permeable the gas is; the water resistance represents the water repellency, the larger the water repellency is, the stronger the water repellency is, and the material strength can also be indirectly represented, which indicates that the porous membrane and the water-repellent breathable composite membrane can be repeatedly cleaned and reused.
The data in table 1 show that the air permeability is the primary consideration while the water repellency is strong, the lower the air permeability value is, the more air permeable the material is, the better the air permeability is, and compared with the single use of the polytetrafluoroethylene biaxial stretching microporous membrane, the water-repellent air-permeable composite membrane of the invention not only has excellent water repellency, but also has improved air permeability.
The water-repellent breathable composite film provided by the invention can be used as a bottom layer to make paper diapers, sanitary towels or protection pads more comfortable to wear.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. A water-repellent breathable composite film is characterized by comprising breathable non-woven fabric and a thermoplastic resin biaxially oriented microporous film thermally compounded on the upper surface of the non-woven fabric.
2. The composite film according to claim 1, wherein the thermoplastic resin biaxially stretched microporous film is laminated on the upper surface of the nonwoven fabric by hot pressing;
preferably, the hot pressing temperature is 160-170 ℃, the traction speed is 3-5m/min, and the hot pressing pressure is 0-0.2 MPa.
3. The composite film according to claim 1, wherein the thermoplastic resin biaxially oriented microporous film has an average pore diameter of 0.1 to 2 μm and a porosity of 75 to 85%, preferably 80 to 85%;
preferably, the thickness of the thermoplastic resin biaxially oriented microporous membrane is 50 to 80 μm.
4. The composite film according to claim 1, wherein the thermoplastic resin biaxially stretched microporous film has an antibacterial and/or bactericidal function.
5. The composite film according to any one of claims 1 to 4, wherein the thermoplastic resin biaxially oriented microporous film is made of polyethylene, polypropylene or polytetrafluoroethylene;
preferably, the thermoplastic resin biaxially oriented microporous membrane is made of polytetrafluoroethylene.
6. A composite film according to any of claims 1 to 4 wherein said biaxially oriented microporous thermoplastic resin film is prepared by a process comprising the steps of:
mixing the liquid lubricant with the thermoplastic resin, curing, prepressing for forming, extruding and rolling to prepare a thermoplastic resin base band;
sequentially carrying out longitudinal stretching, transverse stretching and shaping on the thermoplastic resin base band to prepare the thermoplastic resin biaxial stretching microporous membrane;
preferably, the thermoplastic resin is a polytetrafluoroethylene dispersion resin;
more preferably, the molecular weight of the polytetrafluoroethylene resin is 300 to 400 ten thousand.
7. The composite film of any of claims 1-4 further comprising an absorbent core layer over the thermoplastic resin biaxially oriented microporous film.
8. The composite film according to any one of claims 1 to 4, further comprising a moisture-absorbing layer thermally laminated between the nonwoven fabric and the thermoplastic resin biaxially stretched microporous film.
9. Use of a composite film according to any one of claims 1 to 8 in hygiene articles.
10. A sanitary article, comprising the composite film according to any one of claims 1 to 8;
preferably, the sanitary article comprises a paper diaper, a paper diaper pad, a sanitary towel and a panty liner.
CN202010189495.2A 2020-03-18 2020-03-18 Water-repellent breathable composite film, sanitary product and application Pending CN113492556A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824499A (en) * 1987-07-08 1989-04-25 Tonen Sekiyukagaku K.K. Method for production of gas-pervious composite film
US4878974A (en) * 1988-02-05 1989-11-07 Tonen Sekiyukagaku Kabushiki Kaisha Method of producing a gas-permeable, waterproof composite sheet
JPH0280231A (en) * 1988-09-16 1990-03-20 Tonen Sekiyukagaku Kk Manufacture of composite sheet having water-proof properties and air permeability
JP2004136678A (en) * 1995-09-20 2004-05-13 Kao Corp Moisture permeable sheet and absorbent article using the same
CN1552757A (en) * 2003-05-28 2004-12-08 上海杰事杰新材料股份有限公司 Microporous membrane, preparing method and use
JP2010235131A (en) * 2009-03-30 2010-10-21 Asahi Kasei Fibers Corp Air-permeable mold

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4824499A (en) * 1987-07-08 1989-04-25 Tonen Sekiyukagaku K.K. Method for production of gas-pervious composite film
US4878974A (en) * 1988-02-05 1989-11-07 Tonen Sekiyukagaku Kabushiki Kaisha Method of producing a gas-permeable, waterproof composite sheet
JPH0280231A (en) * 1988-09-16 1990-03-20 Tonen Sekiyukagaku Kk Manufacture of composite sheet having water-proof properties and air permeability
JP2004136678A (en) * 1995-09-20 2004-05-13 Kao Corp Moisture permeable sheet and absorbent article using the same
CN1552757A (en) * 2003-05-28 2004-12-08 上海杰事杰新材料股份有限公司 Microporous membrane, preparing method and use
JP2010235131A (en) * 2009-03-30 2010-10-21 Asahi Kasei Fibers Corp Air-permeable mold

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Application publication date: 20211012