CN113373726B - Latex and preparation method and application thereof - Google Patents
Latex and preparation method and application thereof Download PDFInfo
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- CN113373726B CN113373726B CN202110582911.XA CN202110582911A CN113373726B CN 113373726 B CN113373726 B CN 113373726B CN 202110582911 A CN202110582911 A CN 202110582911A CN 113373726 B CN113373726 B CN 113373726B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Paper (AREA)
Abstract
The invention belongs to the field of packaging materials, and discloses a latex, and a preparation method and application thereof. The latex comprises oil-proof particles A and oil-proof particles B, wherein the oil-proof particles A are at least one of polyester emulsion, polyvinyl alcohol emulsion or styrene-acrylic emulsion; the oil-proof particles B are cellulose film-forming agents and/or polymers containing benzene rings. A paper having a surface comprising a coating formed from a latex. The invention utilizes two oil-proof particles with different compatibility to form heterogeneous oil-proof latex, and can provide a passage for water vapor to pass through while preventing oil, thereby achieving the oil-proof and air-permeable performances. The glue does not contain fluorine, and is very environment-friendly; the latex is applied to the surface of paper to obtain oil-proof and breathable paper which is applied to the field of food packaging, and the paper can be directly crushed and pulped for recycling.
Description
Technical Field
The invention belongs to the field of packaging materials, and particularly relates to a latex, and a preparation method and application thereof.
Background
The grease-proof paper is a specialty paper that is grease-proof, and is generally manufactured by high-beating-degree treatment and papermaking treatment. At present, more films are coated or oil-proof agents are coated on the surface of paper, so that the paper has the function of preventing oil and fat from permeating. The oil-proof paper is widely applied to food manufacturing and packaging.
At present, high-carbon chain fluorine-containing compounds with low surface energy are mostly adopted at home and abroad as oil-proof agents to treat the surface of paper so as to achieve the oil-proof effect. However, the main component of the fluorine-containing compound is perfluorooctane sulfonyl compound, which has strong durability, is difficult to metabolize and degrade, can be durably accumulated in organisms and environment, and brings huge hidden troubles to food safety and environment.
Except for the fluorine-containing oil-proof agent, the fluorine-free oil-proof agent and the film coating process also endow the paper with oil-proof performance, but the oil-proof paper prepared by the two ways damages the air permeability of the base paper in order to obtain high oil-proof and water-proof barrier property, so that water vapor cannot permeate the barrier layer to be condensed in the packaging bag, and the color, the smell and the taste of food are changed. Particularly, when fried foods, foods to be cooked or microwave-heated are packaged, water vapor emitted from the foods fills the inside of the packaging bag, so that the outer layer of the fried foods contains moisture to become too soft, or stickiness is generated on the paper surface, resulting in a significant deterioration in taste or mouthfeel.
Therefore, it is necessary to provide a material which does not contain fluorine, has improved oil-repellent properties, and has good air permeability.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. The latex is coated on the surface of paper, so that the paper has good oil-proof and water-proof performance, water vapor can easily pass through the latex, and the latex does not contain fluorine and is very environment-friendly. Paper coated with the latex of the present invention has wide application in the field of food packaging.
In a first aspect of the invention, a latex is provided.
Specifically, the latex comprises oil-proof particles A and oil-proof particles B, wherein the oil-proof particles A are at least one of polyester emulsion, polyvinyl alcohol emulsion or styrene-acrylic emulsion; the oil-proof particles B are cellulose film-forming agents and/or polymers containing benzene rings.
Preferably, the oil-resistant particles a are selected from at least one of Polyhydroxyalkanoate (PHA) emulsion, polylactic acid (PLA) emulsion or polyvinyl alcohol (PVA) emulsion.
Preferably, the cellulose film forming agent is cellulose acetate butyrate.
Preferably, the polymer containing a benzene ring is selected from a styrene-acrylic polymer and/or a styrene-butadiene polymer.
Preferably, the latex further comprises an auxiliary agent and/or a solvent.
Preferably, the defoaming agent is selected from at least one of polysiloxane defoaming agent, polyether modified silicone oil, dialkyl phosphate or fatty alcohol.
Preferably, the auxiliary agent comprises a defoaming agent; further preferably, the defoaming agent is an oil-based defoaming agent (e.g., polyether-modified silicone oil).
Preferably, the solvent is water; further preferably, the solvent is deionized water.
Preferably, the latex comprises 12 to 36 parts of oil-proof particles A and 8 to 27 parts of oil-proof particles B; further preferably, the latex comprises 17.6 to 31.5 parts of the oil-proof particles A and 10 to 25 parts of the oil-proof particles B by weight.
Preferably, the latex further comprises 0.4-6 parts of an auxiliary agent according to parts by weight; further preferably, the latex further comprises 0.4-3.5 parts by weight of an auxiliary agent.
Preferably, the latex further comprises 30-80 parts of a solvent according to parts by weight; further preferably, the latex further comprises 40-72 parts by weight of a solvent.
In a second aspect, the present invention provides a process for the preparation of a latex.
Specifically, the preparation method of the latex comprises the following steps:
the latex is prepared by stirring and mixing the components.
Preferably, a method for preparing a latex comprises the following steps:
and mixing the oil-proof particles A with a solvent, then adding the oil-proof particles B, and stirring to obtain the latex.
Preferably, an auxiliary agent is also added in the process of mixing the oil-proof particles A and the solvent.
Preferably, the stirring speed is 700-1500 rpm; further preferably, the stirring speed is 800 to 1000 rpm. The high-speed stirring is helpful for improving the oil resistance and air permeability of the paper when the prepared latex is applied to the surface of the paper.
Preferably, the stirring time is 10-20 minutes; further preferably, the stirring time is 10 to 15 minutes.
Preferably, the stirring is performed under a closed condition at normal temperature.
In a second aspect the present invention provides the use of a latex.
A paper comprising a coating on a surface of the paper, the coating being formed from the latex of the invention.
The preparation method of the paper comprises the following steps:
taking base paper as a base material, then coating the latex on the surface of the base material, and drying to obtain the paper.
Preferably, the base paper is 180-220g/m 2 The base paper of (1); more preferably, the base paper is 180-200g/m 2 The base paper of (1).
Preferably, the coating is two-pass coating or two-pass coating of the upper surface and the lower surface of the base paper.
Preferably, the coating weight of the latex coated on the surface of the substrate is 7-14.5g/m 2 (ii) a More preferably, the coating weight of the glue coated on the surface of the base material is 10-13.5g/m 2 。
Preferably, hot air is adopted for drying during drying; the drying temperature is 102-105 ℃.
Use of the paper in the field of packaging.
Preferably, the packaging field is the field of food packaging.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention utilizes two oil-proof particles with different compatibility to form heterogeneous oil-proof latex, and can provide a passage for water vapor to pass through while preventing oil, thereby achieving the oil-proof and air-permeable performances.
(2) The latex does not contain fluorine, and is very environment-friendly.
(3) The latex is applied to the surface of paper to obtain oil-proof and breathable paper, and the paper can be directly crushed and pulped for recycling and utilization in the field of food packaging.
Drawings
FIG. 1 is a schematic structural view of paper produced in example 1 of the present invention;
FIG. 2 is a graph comparing the oil resistance of the paper prepared in example 2 with that of the base paper and the coated paper;
FIG. 3 is a diagram of recycled slurry of paper and laminated paper prepared in example 2 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
The starting materials, reagents or apparatuses used in the following examples are, unless otherwise specified, either commercially available from conventional sources or can be obtained by known methods.
Polyhydroxyalkanoate (PHA) emulsions used in embodiments of the present invention may be sold by cyanamid company.
Polylactic acid (PLA) emulsions used in the examples of the invention may be sold by Anhuifeng.
The styrene-acrylic emulsion used in the embodiment of the invention can be sold by the chemical industry of gold Zhuhai chickens, and the product model is SA618.
The polyvinyl alcohol (PVA) emulsion used in the embodiment of the invention can be sold by chemical industry of Changchun, and the product model is BF17.
Cellulose acetate butyrate used in the present examples may be sold by eastman, usa.
Example 1: latex and paper production
A latex, which comprises 17.6 parts of oil-proof particles A, 20 parts of oil-proof particles B, 2 parts of polyether modified silicone oil and 60.4 parts of deionized water; the oil-proof particles A are Polyhydroxyalkanoate (PHA) emulsion; the oil-proof particle B is cellulose acetate butyrate.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 1000 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface thereof, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was applied to the surface of a base material (upper and lower surfaces of the base material, coating weight: 10.5 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
FIG. 1 is a schematic view of the structure of paper produced in example 1 of the present invention, in which "1" represents a coating layer and "2" represents base paper. As can be seen from fig. 1, the base paper has coatings on both its upper and lower surfaces.
The paper produced in this example was tested for the following test items: KIT (KIT is a method for testing the oil repellency rating of paper, which is a conventional test method in the art) oil repellency rating, water vapor transmission rate in a high humidity environment (38 ℃, 90% relative humidity), and as a result, the paper prepared in this example had a KIT oil repellency rating of 9 and a water vapor transmission rate of 2300g/m 2 ·d。
Example 2: latex and paper production
A latex comprises 25 parts of oil-proof particles A, 25 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 47 parts of deionized water; the oil-proof particles A are Polyhydroxyalkanoate (PHA) emulsion; the oil-proof particle B is cellulose acetate butyrate.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 1000 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was applied to the surface of a base material (upper and lower surfaces of the base material, coating weight was 12.4 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2375g/m 2 ·d。
FIG. 2 is a graph comparing the oil resistance of the paper prepared in example 2 with that of base paper and laminating paper; in fig. 2, sample 2 shows the paper obtained in example 2, sample 3 is a coated paper of the prior art, sample 1 is a base paper (comparative example 4 shows a base paper). In fig. 2, the upper half is a diagram in which rapeseed oil is dropped on a sample, and the lower half is a diagram in which rapeseed oil is wiped. Rapeseed oil is dripped on the surface of the base paper, the base paper is soaked by the rapeseed oil after 10 seconds, and obvious oil penetration points are formed after wiping. The paper prepared in example 2 and the coated paper in the prior art have no oil penetration point after rapeseed oil is dripped for 1 minute, which shows that the paper prepared in example 2 has good oil resistance.
FIG. 3 is a diagram of recycled slurry of paper and laminated paper prepared in example 2 of the present invention; in fig. 3, sample 2 is the paper obtained in example 2, and sample 3 is the prior art laminated paper. The samples are beaten and rewound to obtain recycled pulp, and as can be seen from fig. 3, the laminated paper in the prior art is difficult to be pulped due to the fact that the laminated paper contains plastics, and a large number of plastic fragments (shown as sample 3 in fig. 3) exist after the laminated paper is rewound, while the paper prepared in the embodiment 2 can be directly rewound, and the obtained recycled pulp does not contain fragments (shown as sample 2 in fig. 3), so that the recycled pulp is beneficial to recycling of the paper.
Example 3: latex and paper production
A latex, which comprises 25 parts of oil-proof particles A, 20 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 52 parts of deionized water; the oil-proof particles A are Polyhydroxyalkanoate (PHA) emulsion; the oil-proof particles B are styrene-butadiene polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating weight 11.7 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a water vapor Transmission of 2361g/m 2 ·d。
Example 4: latex and paper production
A latex, which comprises 23.5 parts of oil-proof particles A, 18 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 55.5 parts of deionized water; the oil-proof particles A are Polyhydroxyalkanoate (PHA) emulsion; the oil-proof particles B are styrene-butadiene polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating amount 12.0 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2397g/m 2 ·d。
Example 5: latex and paper production
A latex comprises 19 parts of oil-proof particles A, 15 parts of oil-proof particles B, 2.5 parts of polyether modified silicone oil and 63.5 parts of deionized water; the oil-proof particles A are Polyhydroxyalkanoate (PHA) emulsion; the oil-proof particles B are styrene-butadiene polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface thereof, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating amount 10.2 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission in a high humidity Environment (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2422g/m 2 ·d。
Example 6: latex and paper preparation
A latex comprises 25 parts of oil-proof particles A, 12 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 60 parts of deionized water; the oil-proof particles A are polylactic acid (PLA) emulsion; the oil-proof particles B are styrene-acrylic acid polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating amount 12.6 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission in a high humidity Environment (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2312g/m 2 ·d。
Example 7: latex and paper production
A latex, which comprises 31.5 parts of oil-proof particles A, 18 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 47.5 parts of deionized water; the oil-proof particles A are polylactic acid (PLA) emulsion; the oil-proof particles B are styrene-butadiene polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, stirring at the stirring speed of 800 revolutions per minute for 15 minutes, and preparing the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The base paper of (2) is used as a base material, and the latex is coated on the surface of the base material (both front surfaces)Coating with a coating weight of 13.2g/m 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., relative humidity 90%), results were that the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2308g/m 2 ·d。
Example 8: latex and paper production
A latex comprising 30 parts of oil-resistant particles A, 10 parts of oil-resistant particles B, 3 parts of a polysiloxane antifoaming agent, and 57 parts of deionized water; the oil-proof particles A are polylactic acid (PLA) emulsion; the oil-proof particles B are styrene-acrylic acid polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating weight 11.4 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission in a high humidity Environment (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2451g/m 2 ·d。
Example 9: latex and paper production
A latex comprises 28 parts of oil-proof particles A, 12 parts of oil-proof particles B, 2 parts of polyether modified silicone oil and 58 parts of deionized water; the oil-proof particles A are styrene-acrylic emulsion; the oil-proof particles B are styrene-acrylic acid polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, stirring at the stirring speed of 800 revolutions per minute for 15 minutes, and preparing the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating weight 11.5 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., 90% relative humidity), the paper produced in this example exhibited a KIT oil repellency rating of 9 and a water vapor Transmission of 2426g/m 2 ·d。
Example 10: latex and paper production
A latex comprises 19 parts of oil-proof particles A, 25 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 53 parts of deionized water; the oil-proof particles A are styrene-acrylic emulsion; the oil-proof particles B are styrene-acrylic acid polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, stirring at the stirring speed of 800 revolutions per minute for 15 minutes, and preparing the latex.
A paper comprising a coating on the surface thereof, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The base paper of (4) was used as a base material, and the latex was coated on the surface of the base material (double coating on the front side, coating amount was 12.1 g/m) 2 ) Drying with hot air at 105 deg.C,and (5) preparing paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., 90% relative humidity), the paper produced in this example had a KIT oil repellency rating of 9 and a water vapor Transmission of 2417g/m 2 ·d。
Example 11: latex and paper production
A latex, which comprises 23 parts of oil-proof particles A, 23 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 51 parts of deionized water; the oil-proof particles A are styrene-acrylic emulsion; the oil-proof particles B are styrene-butadiene polymers.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface of the paper, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The latex was coated on the surface of a base material (double-coated front surface, coating amount: 13.5 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., relative humidity of 90%), the paper produced in this example had a KIT oil repellency rating of 9 and a water vapor Transmission of 2339g/m 2 ·d。
Example 12: latex and paper production
A latex comprises 15 parts of oil-proof particles A, 25 parts of oil-proof particles B, 3 parts of polyether modified silicone oil and 57 parts of deionized water; the oil-proof particles A are styrene-acrylic emulsion; the oil-proof particle B is cellulose acetate butyrate.
A method of preparing a latex comprising the steps of:
stirring and mixing the oil-proof particles A, the polyether modified silicone oil and the deionized water, then adding the oil-proof particles B, and stirring at the stirring speed of 800 revolutions per minute for 15 minutes to obtain the latex.
A paper comprising a coating on the surface thereof, the coating being formed from the above latex.
The preparation method of the paper comprises the following steps:
taking 200g/m 2 The base paper of (4) was used as a base material, and the latex was coated on the surface of the base material (double coating on the front side, coating amount was 12.7 g/m) 2 ) Drying with hot air at 105 deg.C to obtain paper.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions (38 ℃ C., relative humidity of 90%), the paper produced in this example had a KIT oil repellency rating of 9 and a water vapor Transmission of 2502g/m 2 ·d。
Example 13: latex and paper production
Example 13 is compared with example 12 except that the stirring speed is 200 rpm, and the remaining components are prepared in the same manner as in example 13.
The paper produced in this example was tested for the following test items: KIT oil repellency rating, water vapor Transmission under high humidity conditions, the paper produced in this example had a KIT oil repellency rating of 9 and a Water vapor Transmission of 2445g/m 2 ·d。
Comparative example 1
Comparative example 1 is different from example 2 only in that the latex of comparative example 1 is prepared without adding Polyhydroxyalkanoate (PHA) emulsion, and the remaining components and preparation method are the same as example 2.
The paper produced in this comparative example was tested by the following test items: KIT oil repellency rating, water vapor Transmission Rate in a high humidity Environment (38 ℃, 90% relative humidity), the paper produced in this comparative example exhibited a KIT oil repellency rating of 9 and a Water vapor Transmission Rate of 1033g/m 2 ·d。
Comparative example 2
Comparative example 2 is different from example 6 only in that the latex of comparative example 2 is prepared without addition polymerization of a lactic acid (PLA) emulsion, and the remaining components and preparation method are the same as example 6.
The paper produced in this comparative example was tested for the following test items: KIT oil repellency rating, water vapor Transmission Rate in a high humidity Environment (38 ℃, 90% relative humidity), the paper produced in this comparative example was rated 8 in KIT oil repellency rating and had a Water vapor Transmission Rate of 1086g/m 2 ·d。
Comparative example 3
Comparative example 3 is different from example 7 only in that the latex of comparative example 3 is prepared without adding a polylactic acid (PLA) emulsion, and the remaining components and preparation method are the same as example 7.
The paper produced in this comparative example was tested for the following test items: KIT oil repellency rating, water vapor Transmission Rate in a high humidity Environment (38 ℃, 90% relative humidity), the paper produced in this comparative example was 9-grade in KIT oil repellency rating and 1088g/m in Water vapor Transmission Rate 2 ·d。
Comparative example 4
Comparative example 4 is the base paper used in example 2.
The base paper of this comparative example was tested by the test items including: KIT oil repellency rating, water vapor Transmission Rate in a high humidity Environment (38 ℃, 90% relative humidity), the paper produced in this comparative example exhibited a KIT oil repellency rating of 1 and a Water vapor Transmission Rate of 3528g/m 2 ·d。
The paper prepared by the embodiment of the invention has oil-proof and air-permeable performances and can be widely applied to the field of food packaging.
Claims (7)
1. The latex capable of forming the oil-proof and breathable coating is characterized by comprising 12-36 parts of oil-proof particles A, 8-27 parts of oil-proof particles B, 0.4-6 parts of defoaming agent and 30-80 parts of deionized water in parts by weight, wherein the oil-proof particles B are cellulose acetate butyrate and/or a polymer containing benzene rings;
the oil-proof particles A are selected from at least one of polyhydroxyalkanoate emulsion and polylactic acid emulsion;
the polymer containing benzene rings is a styrene-butadiene polymer.
2. The process for the preparation of latex according to claim 1, characterized in that it comprises the following steps:
and stirring and mixing the components to prepare the latex.
3. The method of claim 2, wherein the stirring speed is 700 to 1500 rpm; the stirring time is 10-20 minutes.
4. A paper, characterized in that the surface of the paper comprises a coating formed from the latex of claim 1.
5. A method of making the paper of claim 4, comprising the steps of:
and (3) taking a base material, coating the latex on the surface of the base material, and drying to obtain the paper.
6. Use of the paper of claim 4 in the field of packaging.
7. Use according to claim 6, wherein the packaging field is the field of food packaging.
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| DE102014119572B4 (en) * | 2014-12-23 | 2017-07-06 | Delfortgroup Ag | Environmentally friendly packaging paper for food |
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| JP2015500927A (en) * | 2011-12-06 | 2015-01-08 | ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ | Paper packaging and cardboard packaging with barrier coating |
| WO2014006269A1 (en) * | 2012-07-05 | 2014-01-09 | Upm-Kymmene Corporation | Package for foodstuff |
| CN111655929A (en) * | 2017-11-14 | 2020-09-11 | Aw品牌有限公司 | Recyclable and repulpable translucent or transparent paper and packaging applications thereof |
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