CN107236167A - A kind of preparation method of high-performance polyethylene ventilated membrane - Google Patents

A kind of preparation method of high-performance polyethylene ventilated membrane Download PDF

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Publication number
CN107236167A
CN107236167A CN201710328973.1A CN201710328973A CN107236167A CN 107236167 A CN107236167 A CN 107236167A CN 201710328973 A CN201710328973 A CN 201710328973A CN 107236167 A CN107236167 A CN 107236167A
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polyethylene
film
ventilated membrane
preparation
plastic particles
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CN201710328973.1A
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Inventor
田小艳
杨金明
汤粤豫
王波
黄捷
任蕊
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Shaanxi Research Design Institute of Petroleum and Chemical Industry
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Shaanxi Research Design Institute of Petroleum and Chemical Industry
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Priority to CN201710328973.1A priority Critical patent/CN107236167A/en
Publication of CN107236167A publication Critical patent/CN107236167A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
    • C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The present invention relates to a kind of preparation method of high-performance polyethylene ventilated membrane, its preparing raw material includes polyvinyl resin, modified resin, foaming agent, processing aid, nucleator and dispersant, preparation process is after each raw material is mixed, mixing extrusion is carried out by double screw extruder, obtain plastic particles, plastic particles are made by film using the tape casting again, simple tension finally is carried out to casting films, polyethylene breathable films are made.Porosity height, even aperture distribution, the air penetrability of the polyethylene breathable film are good, and its water vapour permeability is not less than 4000g/m224h, the tensile strength of ventilated membrane is not less than 21/16MPa, elongation at break is not less than 310/350%, both the micro-porous permeable of polyethylene film had been ensure that, the mechanical property of film itself is improved again, the problem of solving the poor mechanical property of conventional polyethylene ventilated membrane presence, product can be widely used in the industry fields such as health care, personal nursing, building, agricultural byproducts packaging.

Description

A kind of preparation method of high-performance polyethylene ventilated membrane
Technical field
The invention belongs to the preparing technical field of high-molecular compound product, it is related to a kind of high-performance polyethylene ventilated membrane Preparation method, its product can be applied to the industry fields such as health care, personal nursing, building, agricultural byproducts packaging.
Background technology
Polyethylene breathable film is to allow water vapor diffusion to pass through but obstruct a kind of microporous barrier of liquid water leakage, main at present For manufacturing the product such as hygiene protective furnishings and gas permeability waterproof cloth, in health care, personal nursing, building, agricultural byproducts The fields such as packaging have been widely used.The preparation technology of polyethylene breathable film traditional at present is first by the nothing based on calcium carbonate Machine filler filled polyethylene, is made special breathable membrane material；Then film is made by curtain coating or blowing mode in PP Pipe Compound；Finally Acted on by applying uniaxial or biaxial stretching to film, polymeric matrix is separated with filler particles surface and in filler Interconnected microchannel is developed between grain, so as to form microporous breathable film.But the addition of inorganic filler in traditional handicraft General all up to 50% or so, so greatly reduce the mechanical performances such as the tensile strength and elongation at break of material, from without Application of the material in fields such as building, agricultural byproducts packagings can be met.
The content of the invention
The purpose of the present invention be in view of the deficienciess of the prior art, provide it is a kind of both there is good waterproof and breathable performance, High-performance polyethylene ventilated membrane of the mechanical property of materials and preparation method thereof can be improved again.
To realize that the technical scheme that the object of the invention is used is as described below.
A kind of high-performance polyethylene ventilated membrane, is made up of the raw material of substance of following matter weight part ratio：
Described polyvinyl resin is two kinds in low density polyethylene (LDPE), low density linear polyethylene, high density polyethylene (HDPE) Or three kinds of mixture, described modified resin is hydrogenated styrene-butadiene-styrene copolymer, propylene-ethylene copolymerization The mixture of one or both of thing, ethylene-vinyl acetate copolymer, the decomposition temperature of described organic foaming agent is 200 It is one kind in azodicarbonamide, ethylenediamine, N, N dinitrosopentamethylene tetramines, benzene sulfonyl hydrazide, alum, institute more than DEG C The processing aid stated be Tissuemat E, OPE, polypropylene wax, oleamide, one kind of erucyl amide, it is described into Core agent is one kind in talcum powder, calcium carbonate, calcium sulfate, sodium citrate, silica；
Method for preparing the polyethylene breathable film includes following preparation process：
1) by after polyvinyl resin, modified resin, organic foaming agent, processing aid, nucleator, dispersant, pass through Double screw extruder carries out mixing extrusion, and 200~500rpm of rotating speed, heating-up temperature is 170~200 DEG C, and extruded stock is made afterwards Grain, obtains plastic particles；
2) using the tape casting by through step 1) film is made in obtained plastic particles, and film temperature is 200~230 DEG C, together When foaming agent decompose, make occur small abscess in film；
3) will be through step 2) obtained casting films carry out simple tension, and draft temperature is 60~90 DEG C, and draw ratio is 1.5~ 4.0, draw speed is 80~120mm/min, and shape 15~40min after stretching, and polyethylene breathable films are made.
Compared with prior art, the invention has the advantages that and beneficial effect：
First, instant invention overcomes the high disadvantage of inorganic filler addition in polyethylene breathable film compound, by poly- second A small amount of organic foaming agent is added in olefine resin, modified resin, foaming agent is decomposed release in 200~230 DEG C of condition and ranges Gas, and then the polyethylene film containing a large amount of fine and closely woven micropores is obtained in the presence of a small amount of nucleator, it both ensure that polyethylene was thin The micro-porous permeable of film, improves the mechanical property of film itself again, solves the mechanical property of conventional polyethylene ventilated membrane presence Can be poor the problem of, mechanical property is reached desired combination with permeability, meet the applicable requirement of product；
2nd, the porosity height of high-performance polyethylene ventilated membrane prepared according to the methods of the invention, even aperture distribution, ventilative Rate is good, and its water vapour permeability is not less than 4000g/m224h, the tensile strength (longitudinal direction/horizontal) of ventilated membrane is not less than 21/ 16MPa, and elongation at break (longitudinal direction/laterally) it is not less than 310%/350%；
3rd, the high-performance polyethylene ventilated membrane for preparing of the present invention has a wide range of application, product can be widely used in health care, The industry fields such as personal nursing, building, agricultural byproducts packaging.
Embodiment
The present invention is described further with reference to embodiment.
Embodiment one
A kind of preparation method of high-performance polyethylene ventilated membrane, its production stage is：
1) 75 parts of low density polyethylene (LDPE) is taken, 15 parts of LLDPE, hydrogenated styrene-butadiene-styrene is common 10 parts of polymers, 2 parts of azodicarbonamide, 2 parts of Tissuemat E, 3 parts of calcium carbonate after mixing, is added in double screw extruder and mixed Extruding pelletization is refined, heating-up temperature is 170 DEG C, and rotating speed is 200rpm, obtains plastic particles；
2) above-mentioned plastic cement pellet is added on curtain coating unit and prepares casting films, film temperature is 200 DEG C, while foaming agent Decompose, make occur small abscess in film；
3) casting films are subjected to simple tension, draft temperature is 60 DEG C, and draw ratio is 1.5, and draw speed is 80mm/min, Shape 20min after stretching, and polyethylene breathable films are made.
Performance test is carried out according to GB/T1037-1988, GB13022-1991, the air penetrability of the polyethylene breathable film is 4200g/m224h, tensile strength longitudinal direction/it is laterally 26/19MPa, longitudinal/horizontal elongation at break is 310/360%, its property Industry-leading status can be in, hence it is evident that better than traditional handicraft product.
Embodiment two
A kind of preparation method of high-performance polyethylene ventilated membrane, its production stage is：
1) 75 parts of low density polyethylene (LDPE), 10 parts of high density polyethylene (HDPE), 10 parts of LLDPE, propylene-ethylene are taken 5 parts of copolymer, 2 parts of (idol) benzene sulfonyl hydrazide, 3 parts of polypropylene wax, 2 parts of talcum powder after mixing, is added in double screw extruder and mixed Extruding pelletization is refined, heating-up temperature is 180 DEG C, and rotating speed is 250rpm, obtains plastic particles；
2) above-mentioned plastic cement pellet is added on curtain coating unit and prepares casting films, film temperature is 210 DEG C, while foaming agent Decompose, gaseous volatilization makes occur small abscess in film；
3) casting films are subjected to simple tension, draft temperature is 80 DEG C, and draw ratio is 2.5, and draw speed is 90mm/min, Shape 30min after stretching, and polyethylene breathable films are made.
Performance test is carried out according to GB/T1037-1988, GB13022-1991, the air penetrability of the polyethylene breathable film is 5100g/m224h, tensile strength longitudinal direction/it is laterally 25/18MPa, longitudinal/horizontal elongation at break is 332/389%, its property Industry-leading status can be in, hence it is evident that better than traditional handicraft product.
Embodiment three
1) 75 parts of low density polyethylene (LDPE), 10 parts of high density polyethylene (HDPE), 10 parts of LLDPE, propylene-ethylene are taken 5 parts of copolymer, 2 parts of (idol) benzene sulfonyl hydrazide, 3 parts of polypropylene wax, 2 parts of talcum powder after mixing, is added in double screw extruder and mixed Extruding pelletization is refined, heating-up temperature is 190 DEG C, and rotating speed is 300rpm, obtains plastic particles；
2) above-mentioned plastic cement pellet is added on curtain coating unit and prepares casting films, film temperature is 220 DEG C, while foaming agent Decompose, gaseous volatilization makes occur small abscess in film；
3) casting films are subjected to simple tension, draft temperature is 90 DEG C, and draw ratio is 4, and draw speed is 110mm/min, Shape 30min after stretching, and polyethylene breathable films are made.
Performance test is carried out according to GB/T1037-1988, GB13022-1991, the air penetrability of the polyethylene breathable film is 5500g/m224h, tensile strength longitudinal direction/it is laterally 22/16MPa, longitudinal/horizontal elongation at break is 323/376%, its property Industry-leading status can be in, hence it is evident that better than traditional handicraft product.
The film performance of table 1
From table 1, it can be seen that the gas permeability (moisture-vapor transmission) that embodiment 1~3 is prepared is not less than 4200g/ m224h, its permeability is significantly larger than gas permeable plain film on the market, while its elongation and tensile strength are also significantly better than city Gas permeable plain film on face.Meanwhile, polyethylene breathable film prepared by the present invention is consistent with gas permeable plain film outward appearance on the market, says It is bright that the gas permeability and mechanical performance of conventional polyethylene film can be substantially improved by preparation method of the present invention.

Claims (1)

1. a kind of preparation method of high-performance polyethylene ventilated membrane, it is characterised in that the polyethylene breathable film is by following matter weight part ratio Raw material of substance be made：
Described polyvinyl resin is two kinds or three in low density polyethylene (LDPE), low density linear polyethylene, high density polyethylene (HDPE) The mixture planted, described modified resin is hydrogenated styrene-butadiene-styrene copolymer, propylene-ethylene copolymers, second The mixture of one or both of alkene-acetate ethylene copolymer, the decomposition temperature of described organic foaming agent 200 DEG C with On, it is one kind in azodicarbonamide, ethylenediamine, N, N dinitrosopentamethylene tetramines, benzene sulfonyl hydrazide, alum, it is described Processing aid is Tissuemat E, OPE, polypropylene wax, oleamide, one kind of erucyl amide, described nucleator For one kind in talcum powder, calcium carbonate, calcium sulfate, sodium citrate, silica；
Method for preparing the polyethylene breathable film includes following preparation process：
1) by after polyvinyl resin, modified resin, organic foaming agent, processing aid, nucleator, dispersant, double spiral shells are passed through Bar extruder carries out mixing extrusion, 200~500rpm of rotating speed, and heating-up temperature is 170~200 DEG C, and extruded stock is granulated afterwards, obtained To plastic particles；
2) using the tape casting by through step 1) film is made in obtained plastic particles, and film temperature is 200~230 DEG C, is sent out simultaneously Infusion is decomposed, and makes occur small abscess in film；
3) will be through step 2) obtained casting films carry out simple tension, and draft temperature is 60~90 DEG C, and draw ratio is 1.5~4.0, Draw speed is 80~120mm/min, and shape 15~40min after stretching, and polyethylene breathable films are made.
CN201710328973.1A 2017-05-11 2017-05-11 A kind of preparation method of high-performance polyethylene ventilated membrane Pending CN107236167A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108912476A (en) * 2018-07-24 2018-11-30 朱圣伟 A kind of high-strength hydrophobicity film and preparation method thereof for fabric
CN109485969A (en) * 2018-10-30 2019-03-19 南京聚隆科技股份有限公司 One kind is exempted to handle fretting map pad pasting wrapping paper material and preparation method thereof
CN110713647A (en) * 2018-07-13 2020-01-21 中国石油化工股份有限公司 Polyethylene composition with improved water vapor barrier property and preparation method thereof
CN110882634A (en) * 2018-09-07 2020-03-17 浙江省化工研究院有限公司 Formula of ethylene-chlorotrifluoroethylene copolymer microporous membrane and method for preparing microporous membrane by using formula
CN110978575A (en) * 2019-12-03 2020-04-10 晋江市兆安科技有限公司 Manufacturing process of breathable film
CN111454474A (en) * 2020-04-26 2020-07-28 福建恒安集团有限公司 Preparation method of activated carbon breathable film
CN111892761A (en) * 2020-08-17 2020-11-06 东莞市赛美塑胶制品有限公司 High-breathability cast film and preparation method thereof
CN115154044A (en) * 2022-07-05 2022-10-11 丹阳市博林医疗用品有限公司 Medical PVC foam adhesive tape

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110713647A (en) * 2018-07-13 2020-01-21 中国石油化工股份有限公司 Polyethylene composition with improved water vapor barrier property and preparation method thereof
CN108912476A (en) * 2018-07-24 2018-11-30 朱圣伟 A kind of high-strength hydrophobicity film and preparation method thereof for fabric
CN110882634A (en) * 2018-09-07 2020-03-17 浙江省化工研究院有限公司 Formula of ethylene-chlorotrifluoroethylene copolymer microporous membrane and method for preparing microporous membrane by using formula
CN109485969A (en) * 2018-10-30 2019-03-19 南京聚隆科技股份有限公司 One kind is exempted to handle fretting map pad pasting wrapping paper material and preparation method thereof
CN110978575A (en) * 2019-12-03 2020-04-10 晋江市兆安科技有限公司 Manufacturing process of breathable film
CN111454474A (en) * 2020-04-26 2020-07-28 福建恒安集团有限公司 Preparation method of activated carbon breathable film
CN111892761A (en) * 2020-08-17 2020-11-06 东莞市赛美塑胶制品有限公司 High-breathability cast film and preparation method thereof
CN115154044A (en) * 2022-07-05 2022-10-11 丹阳市博林医疗用品有限公司 Medical PVC foam adhesive tape

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Application publication date: 20171010