CN114851660B - Breathable casting film and preparation method thereof - Google Patents
Breathable casting film and preparation method thereof Download PDFInfo
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- CN114851660B CN114851660B CN202210209452.5A CN202210209452A CN114851660B CN 114851660 B CN114851660 B CN 114851660B CN 202210209452 A CN202210209452 A CN 202210209452A CN 114851660 B CN114851660 B CN 114851660B
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- 238000005266 casting Methods 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 48
- 239000012792 core layer Substances 0.000 claims abstract description 39
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 39
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 39
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 38
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 38
- 239000002344 surface layer Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims abstract description 30
- -1 polyethylene Polymers 0.000 claims abstract description 10
- 239000004698 Polyethylene Substances 0.000 claims abstract description 9
- 229920000573 polyethylene Polymers 0.000 claims abstract description 9
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 6
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000001035 drying Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 230000001788 irregular Effects 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 21
- 230000002706 hydrostatic effect Effects 0.000 description 14
- 238000001514 detection method Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- JLFNLZLINWHATN-UHFFFAOYSA-N pentaethylene glycol Chemical compound OCCOCCOCCOCCOCCO JLFNLZLINWHATN-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 229920001875 Ebonite Polymers 0.000 description 2
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Classifications
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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
- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- 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
-
- 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
- B32B27/08—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 synthetic resin
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- 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
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The application relates to the technical field of plastics, in particular to a breathable casting film and a preparation method thereof. The breathable casting film is of a layered structure and is formed by compounding a core layer and surface layers arranged on two sides of the core layer; the surface layer comprises the following components in parts by weight: 55-75 parts of metallocene linear low-density polyethylene, 20-35 parts of high-pressure polyethylene, 15-25 parts of breathable master batch, and the core layer comprises the following components in parts by weight: 16.5-20.5 parts of linear low-density polyethylene, 12-16 parts of high-pressure polyethylene and 60-65 parts of breathable master batch; the breathable master batch comprises high-density polyethylene, polyethylene glycol and butanediol; the preparation method comprises the following steps: and (3) melting and coextruding the core layer material component and the surface layer component, cooling, stretching, shaping, winding, soaking in a water tank, and drying to obtain the composite material. The breathable casting film has a large number of micropores with irregular hole arrangement, is favorable for improving air circulation, and has higher breathability.
Description
Technical Field
The application relates to the technical field of plastics, in particular to a breathable casting film and a preparation method thereof.
Background
The plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, and is widely applied to the fields of food, medicine, chemical industry, articles for daily use and the like. Wherein, the breathable film is a plastic film formed by adding incompatible inorganic particle pore-forming agent into polymer, stretching after film forming, and the structure of the breathable film is provided with a plurality of micropores like capillaries, wherein the micropores can allow gas molecules to pass through, but not liquid molecules to pass through. Breathable waterproof performance based on breathable films is widely used in the personal hygiene care and medical fields.
At present, a breathable film is formed by 15-25 parts by mass of low-density polyethylene, 25-35 parts by mass of linear low-density polyethylene, 5-15 parts by mass of metallocene linear low-density polyethylene and 35-45 parts by mass of high-density polyethylene. The breathable film was tested for breathability according to JIS P8117, and the time required for the sample to permeate 100mL of air was 7850s at minimum.
However, as the living standard of people is continuously improved, the requirements of people on quality, air permeability, comfort level and the like of daily health care products are also increasingly high, so that the air permeability of the existing air permeable film cannot well meet the needs of people, and the air permeability of the film needs to be improved.
Disclosure of Invention
In order to improve the breathability of the cast film, the present application provides a breathable cast film and a method of preparing the same.
In a first aspect, the present application provides a breathable cast film, which adopts the following technical scheme:
the breathable casting film is of a layered structure and is formed by compounding a core layer and surface layers arranged on two sides of the core layer;
the surface layer comprises the following components in parts by weight:
55-75 parts of metallocene linear low density polyethylene;
20-35 parts of high-pressure polyethylene;
15-25 parts of breathable master batch;
the core layer comprises the following components in parts by weight:
16.5-20.5 parts of linear low density polyethylene;
12-16 parts of high-pressure polyethylene;
60-65 parts of breathable master batch;
the breathable master batch comprises high-density polyethylene, polyethylene glycol and butanediol.
By adopting the technical scheme, the nonionic surfactant polyethylene glycol, the chain extender butanediol and the high-density polyethylene are compounded, and the high-density polyethylene, the polyethylene glycol and the butanediol have synergistic effect. On one hand, after the high-density polyethylene, the polyethylene glycol and the butanediol are compounded, the dispersibility among the three is strong, the synergistic effect among the high-density polyethylene, the polyethylene glycol and the butanediol is promoted, the crystallization of the high-density polyethylene can be promoted, the crystallinity and the platelet thickness of the high-density polyethylene are improved, and the breathable master batch with good dispersibility, narrow molecular weight distribution and large molecular weight is obtained. On the other hand, after the high-density polyethylene, the polyethylene glycol and the butanediol are compounded, the obtained breathable master batch has strong stability of the generated micropore structure, and the influence of other process conditions on the micropore structure of the breathable master batch can be reduced.
Therefore, the breathable master batch is added into the surface layer and the core layer, so that the crystallinity and the platelet thickness of the surface layer and the core layer are improved, the elastic recovery rate of the surface layer and the core layer is improved, the surface layer and the core layer are separated and form structurally stable micropores in the subsequent stretching treatment step, and the air permeability and the yield of the obtained casting film are improved. Meanwhile, the air-permeable master batch has better dispersibility in the surface layer and the core layer, and the pore diameter of the obtained air-permeable casting film is smaller than the particle diameter of water and larger than the particle diameter of water vapor or air. Thus, the resulting breathable cast film has good breathability and water repellency. In the subsequent cooling treatment step of the surface layer and the core layer, because the polyethylene glycol and the butanediol have good compatibility with water, the polyethylene glycol and the butanediol fall off from the surface layer and the core layer and are dissolved in the water, so that a large number of micropores with irregular hole arrangement are formed on the surfaces of the surface layer and the core layer, the air permeability of the obtained casting film can be further improved, and the time required for permeating 100mL of air of the obtained air-permeable casting film is 5525s at the shortest.
Preferably, the high density polyethylene has a melt flow rate of 8.0-10g/10min and the polyethylene glycol has a molecular weight of 400-600.
By adopting the technical scheme, the melt flow rate of the high-density polyethylene is 8.0-10g/10min, the high-density polyethylene has specific molecular weight and crystallinity, and the high-density polyethylene, the polyethylene glycol and the butanediol are compounded, so that the synergistic effect of the polyethylene glycol, the butanediol and the high-density polyethylene is improved, the crystallinity and the platelet thickness of the high-density polyethylene are further improved, and the breathable master batch with narrower molecular weight distribution and larger molecular weight is obtained. Meanwhile, the polyethylene glycol with the molecular weight can promote the mutual solubility of butanediol and water, so that the breathable master batch has good solubility in water at a lower temperature. Therefore, the breathable master batch obtained by compounding the high-density polyethylene, the polyethylene glycol and the butanediol under the conditions improves the micropore number of the breathable casting film, and is beneficial to improving the breathability of the breathable casting film.
Preferably, the breathable master batch in the surface layer is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.2-0.4) to 0.2-0.4.
Preferably, in the core layer, the breathable master batch is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.4-0.6) to 0.4-0.6.
By adopting the technical scheme, the proportion of the high-density polyethylene, the polyethylene glycol and the butanediol used for preparing the breathable master batch is optimized in the surface layer and the core layer, and finally the breathable casting film is obtained, and the holes on the surfaces of the surface layer and the core layer are staggered. Meanwhile, the pore diameter of the micropores of the core layer is larger than that of the micropores of the surface layer, so that air pressure is formed in the air-permeable casting film, air circulation is promoted, and the air permeability of the air-permeable casting film is improved.
Preferably, the metallocene linear low density polyethylene has a melt flow rate of 3.0-4.0g/10min and a density of 0.925-0.929g/cm 3 Metallocene linear low density polyethylene having a melt flow rate of 1.5 to 2.5g/10min and a density of 0.916 to 0.929g/cm 3 The metallocene linear low density polyethylene has a melt flow rate of 3.0-4.0g/10min and a density of 0.925-0.929g/cm 3 Metallocene linear low density polyethylene having a melt flow rate of 1.5 to 2.5g/10min and a density of 0.916 to 0.929g/cm 3 The weight ratio of the metallocene linear low density polyethylene is (1.5-1.7).
By adopting the technical scheme, the melt flow rate is 3.0-4.0g/10min, and the density is 0.925-0.929g/cm 3 Metallocene linear low density polyethylene having a melt flow rate of 1.5 to 2.5g/10min and a density of 0.916 to 0.929g/cm 3 The metallocene linear low-density polyethylene is compounded according to the proportion, so that the mechanical property of the obtained breathable casting film can be improved.
Preferably, the particle size of the breathable master batch is 0.2-0.8mm.
By adopting the technical scheme, as the particle size of the breathable master batch is in the range, the dispersibility in the core layer and the surface layer is good, and the breathable master batch has good separation capability, is beneficial to improving the number of micropores formed in the core layer and the surface layer and improving the breathability of the obtained casting film.
In a second aspect, the present application provides a method for preparing a breathable cast film, which adopts the following technical scheme: a method for producing a breathable cast film comprising the steps of:
and (3) carrying out melt coextrusion on the core layer material component and the surface layer component, cooling, stretching, shaping, winding, soaking in a water tank, and drying to obtain the breathable casting film.
By adopting the technical scheme, after the core layer material and the surface layer are sequentially subjected to melt coextrusion and stretching treatment, the breathable master batch in the core layer and the surface layer are separated and form micropores. Meanwhile, in the soaking process of the wound film in the water tank, the breathable master batches in the core layer and the surface layer are contacted with water and dissolved by the water, so that the number of micropores of the obtained breathable casting film is further increased, and the breathable waterproof performance of the obtained breathable casting film is improved. And then drying the film to remove the surface moisture, thus obtaining the breathable casting film.
Preferably, the stretching step comprises cold stretching and hot stretching, wherein the temperature of the cold stretching is 30-40 ℃, and the stretching ratio is 1.5-1.7; the temperature of the hot stretching is 90-110 ℃, and the stretching ratio is 1.8-1.9.
By adopting the technical scheme, the surface layer and the core layer are subjected to cold stretching under the conditions, so that the platelet structure in the breathable master batch is bent and separated into micropores; the hot stretching stage promotes the separation of the platelet structure in the breathable master batch and improves the pore diameter of micropores. Meanwhile, the lamellar crystals in the breathable master batch promote micropores to form a network structure in the hot stretching stage, so that the stability of the micropores is improved. Therefore, the breathable waterproof film obtained after cold stretching and hot stretching of the surface layer and the core layer has higher breathable waterproof performance.
In summary, the present application has the following beneficial effects:
1. because the high-density polyethylene, the polyethylene glycol and the butanediol adopted by the method have synergistic effect, the obtained breathable master batch has narrower molecular weight distribution and larger molecular weight, and is beneficial to separating and forming a large number of micropores in the stretching step, so that the breathability of the obtained casting film is improved; meanwhile, polyethylene glycol and butanediol in the breathable master batch can be mutually dissolved with water in the cooling step, so that the micropore structure of the surface of the obtained casting film is increased, and the breathability of the obtained casting film is further improved;
2. according to the method, through cold stretching and hot stretching, the change of the platelet structure in the breathable master batch is promoted, the breathable master batch is separated, a large number of micropores are formed, and the breathability of the obtained casting film is improved; meanwhile, the preparation method is simple to operate and convenient for large-scale production.
Detailed Description
The present application is described in further detail below with reference to examples.
Metallocene linear low density polyethylene with melt flow rate of 3.0-4.0g/10min and densityThe degree of refraction is 0.925-0.929g/cm 3 The metallocene linear low density polyethylene A;
metallocene linear low density polyethylene with melt flow rate of 1.5-2.5g/10min and density of 0.916-0.929g/cm 3 The metallocene linear low density polyethylene B;
high pressure polyethylene having a melt flow rate of 7.0 to 9.0g/10min and a density of 0.915 to 0.92g/cm 3 The high-pressure polyethylene C; linear low density polyethylene having a melt flow rate of 1.0 to 3.0g/10min and a density of 0.915 to 0.921g/cm 3 And is designated as linear low density polyethylene D.
The breathable cast films obtained in examples and comparative examples herein were subjected to the following detection criteria for water vapor transmission rate, air transmission rate, hydrostatic pressure resistance, elongation at break and porosity:
and (3) detecting the water vapor transmittance: reference is made to GB/T1037-88;
and (3) detecting air transmittance: reference is made to JIS P8117;
hydrostatic pressure resistance detection: reference is made to GB/T4744;
elongation at break detection: reference is made to GB/T1040.3;
porosity detection: reference is made to GB/T33052-2016.
Preparation of raw materials
Preparation example 1
The breathable master batch comprises the following components in parts by weight as shown in table 1: mixing high-density polyethylene, polyethylene glycol and butanediol, banburying at 140 ℃ for 5min, adopting a double-screw extruder, extruding and granulating at the screw speed of 60r/min and the extruder temperature of 180-230 ℃ to obtain the breathable master batch.
In this example, high density polyethylene 5361A was used, the type 5361A, and the melt flow rate of high density polyethylene 5361A was 5.4g/10min, purchased from Style plastic co-plasticization Co., ltd.
The polyethylene glycol is PEG-200 with molecular weight of 200, and is purchased from Jinan Yongfei chemical industry Co., ltd.
The particle size of the breathable master batch is 0.2-0.8mm through detection.
PREPARATION EXAMPLES 2-3
A breathable masterbatch was different from preparation example 1 in that the components and the weights thereof are shown in Table 1.
TABLE 1 Components in preparation examples 2-3 and weights (kg)
Preparation example 6
A breathable master batch is different from preparation example 3 in that equal amount of high-density polyethylene DGDA-6944 is adopted to replace high-density polyethylene 5361A, and the melt flow rate of the high-density polyethylene DGDA-6944 is 8.0g/10min; an equivalent amount of polyethylene glycol PEG400 is used instead of polyethylene glycol PEG-200, and the molecular weight of the polyethylene glycol PEG400 is 400.
Because the high-density polyethylene with the melt flow rate of 8.0-10g/10min and the polyethylene glycol with the molecular weight of 400-600 are compounded with the butanediol to obtain the breathable master batch, the breathable master batch has the same influence on the molecular weight distribution, the molecular weight, the crystallinity and the platelet thickness. Therefore, in this preparation example, only the high-density polyethylene having a melt flow rate of 8.0g/10min and polyethylene glycol having a molecular weight of 400 are briefly described, but the application of the high-density polyethylene having a melt flow rate limited in the present application is not affected.
The particle size of the breathable master batch is 0.2-0.8mm through detection.
Examples
Example 1
Breathable cast films, the components and their weights are shown in table 2, and are prepared by the following preparation steps:
s1: and respectively and uniformly mixing the components in the surface layer and the components in the core layer to obtain a surface layer mixture and a core layer mixture. Adding the surface layer mixture into an A screw extruder, adding the core layer mixture into a B screw extruder, controlling the linear speed of the extruder to be 200r/min, and extruding the fuse piece.
Wherein, the temperature of each region of the hopper A of the extruder is 185 ℃, 210 ℃, 245 ℃, 260 ℃ and 260 ℃ from the feeding section to the temperature of each region of the machine head 260 ℃, 260 ℃ and 260 DEG C260 ℃, 260 ℃;
the temperature of each region of the hopper B of the extruder is 200 ℃, 220 ℃, 250 ℃, 260 ℃ and 260 ℃ from the feeding section to the temperature of each region of the machine head 265 ℃, 260 ℃ and 260 DEG C260 ℃, 260 ℃.
S2: controlling the air flow rate at the outlet of the air knife to be 1.2m/s, cooling the fuse piece by the air knife, drawing the fuse piece to a cooling roller at 80 ℃ by a casting roller at 90 ℃, and rolling the fuse piece by a rolling roller to obtain the prefabricated film. Wherein the draw ratio of the casting rolls was 55. And (5) annealing the prefabricated film in a drying box at 130 ℃ for 120min to obtain the hard elastomer prefabricated film.
S3: firstly, cold stretching is carried out on a hard elastomer prefabricated film at a stretching strain rate of 500%/min, a stretching ratio of 1.3 and a temperature of 25 ℃, then hot stretching is carried out at a stretching strain rate of 50%/min, a stretching ratio of 1.6 and a temperature of 80 ℃, then heat setting is carried out at 140 ℃ for 20min, finally, soaking is carried out in a water tank at 50 ℃ for 5min, and after drying at 100 ℃, the breathable casting film is obtained.
In the present application, the basis weight of the obtained breathable cast film was 35g/m 2 。
Examples 2 to 3
A breathable cast film was different from example 1 in that the components and their weights are shown in table 2.
Table 2 the components and weights (kg) thereof in examples 2-3
The breathable cast films obtained in examples 1 to 3 were subjected to the detection of water vapor permeability, air permeability, hydrostatic pressure resistance, elongation at break and porosity, and the detection results are shown in the following table.
As is clear from the above table, the breathable cast films obtained in examples 1 to 3 have a water vapor transmission rate as high as 2632 to 2652 g/(m) 2 * 24h) The air permeability is as low as 5680-5685s/100mL, and the hydrostatic pressure resistance is as high as 62-65cm/H 2 O, the porosity is as high as 40-42%. Therefore, the breathable casting film obtained by the method has good breathable waterproof capability and high elongation at break.
Examples 4 to 5
A breathable cast film was the same as in example 2 except that the water-permeable master batch obtained in the different preparation examples was used for the surface layer and the core layer.
The water-permeable master batches used for the skin and core layers are shown in the following table.
The breathable cast films obtained in examples 4 to 14 were subjected to the detection of water vapor permeability, air permeability, hydrostatic pressure resistance, elongation at break and porosity, and the detection results are shown in the following table.
As is clear from the above tables, the breathable cast films obtained in examples 2, 4 to 11 and example 14 were significantly higher in water vapor permeability, air permeability, hydrostatic pressure resistance, elongation at break and porosity than the breathable cast films obtained in examples 12 and 13. Therefore, in the total raw materials of the breathable casting film, the breathable master batch is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.2-0.6) to 0.2-0.6, so that the breathable waterproof property and the elongation at break of the breathable casting film can be improved.
In particular, among the breathable cast films obtained in examples 4 to 11, the breathable cast films obtained in examples 4, 5, 7, 8, 10 and 11 were high in water vapor permeability, air permeability, hydrostatic pressure resistance, elongation at break and porosity. Therefore, in the total raw materials of the breathable casting film, the breathable master batch in the surface layer is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.2-0.4); in the core layer, the breathable master batch is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.4-0.6) to 0.4-0.6. The air-permeable waterproof ability of the finally obtained air-permeable casting film can be improved.
Among them, in the breathable cast films obtained in examples 5, 7, 8, 10, 11 and 14, the water vapor transmission rate, air transmission rate, hydrostatic pressure resistance, elongation at break and porosity of example 14 were all high.
Example 15
A breathable cast film was the same as in example 14 except that the metallocene linear low density polyethylene was composed of a blend of 4kg of the metallocene linear low density polyethylene A and 2.5kg of the metallocene linear low density polyethylene B.
Since the metallocene linear low density polyethylene obtained by the metallocene linear low density polyethylene A and the metallocene linear low density polyethylene B have the same influence on the properties of the breathable casting film according to the weight ratio (1.5-1.7): 1, in the embodiment of the application, only the mixed composition of the metallocene linear low density polyethylene A and the metallocene linear low density polyethylene B with the weight ratio of 1.6:1 is taken as an example for brief description, but other weight ratios of the metallocene linear low density polyethylene A and the metallocene linear low density polyethylene B are not influenced in the application.
The breathable cast film obtained in example 14 was subjected to water vapor transmission rate, air transmission rate, hydrostatic pressure resistance, elongation at break and porosity test, and the test results are shown in the following table.
Example 16
A breathable cast film differing from example 15 in that in the preparation step S3 of the breathable cast film, the temperature of cold stretching was 30 ℃ and the stretching ratio was 1.5; the temperature of the hot stretching was 90℃and the stretching ratio was 1.8.
The breathable cast film obtained in example 16 was subjected to water vapor transmission rate, air transmission rate, hydrostatic pressure resistance, elongation at break and porosity test, and the test results are shown in the following table.
In the preparation step S3 of the breathable casting film, the cold stretching temperature is 30-40 ℃ and the stretching ratio is 1.5-1.7; the temperature of hot stretching is 90-110 ℃, the stretching ratio is 1.8-1.9, and the influences on the water vapor transmittance, hydrostatic pressure resistance, elongation at break and porosity of the finally obtained breathable casting film are the same, so in the embodiment of the application, only the temperature of cold stretching is 30 ℃,
the draw ratio was 1.5; the temperature of the hot stretching is 90 ℃ and the stretching ratio is 1.8 for the brief description, but the application of the temperature and the stretching ratio of the hot stretching and the cold stretching in the application is not affected.
Comparative example
Comparative example 1
A breathable cast film was prepared in the same manner as in example 16 except that the same amount of polyethylene glycol PEG400 was used instead of butanediol.
Comparative example 2
A breathable cast film was prepared in the same manner as in example 16 except that the same amount of butanediol was used instead of polyethylene glycol PEG 400.
Comparative example 3
A breathable cast film was different from example 16 in that the same amount of butanediol was used instead of the breathable master batch, and the other was the same as in example 16.
Comparative example 4
A breathable cast film was different from example 16 in that the same amount of polyethylene glycol PEG400 was used instead of the breathable master batch, and the other was the same as in example 16.
Comparative example 5
A breathable cast film was different from example 16 in that the same amount of low density polyethylene LD605 was used instead of high density polyethylene DGDA-6944, except that the same amount of low density polyethylene LD605 was used as in example 16.
The breathable cast films obtained in comparative examples 1 to 5 were subjected to the detection of water vapor permeability, air permeability, hydrostatic pressure resistance, elongation at break and porosity, and the detection results are shown in the following table.
As is clear from the above table, the breathable cast films obtained in comparative examples 1 to 5 have a water vapor permeability as low as 1105-1253 g/(m) 2 * 24h) The air permeability is as high as 6500-6615s/100mL, the hydrostatic pressure resistance is as low as 50-55cm/H 2 O, the porosity is as low as 26-33%.
The breathable cast films obtained according to comparative examples 1 to 5 were reduced in water vapor permeability by 55.25 to 60.54%, improved in air permeability by 17.65 to 19.73%, reduced in hydrostatic pressure by 28.57 to 35.06%, and reduced in porosity by 36.54 to 50.00% as compared with the breathable cast film obtained according to example 14. From this, it was revealed that, among the total raw materials of the breathable cast film of the present application, high-density polyethylene, polyethylene glycol and butanediol have a synergistic effect, and the breathable waterproof property and elongation at break of the resulting breathable cast film can be improved.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (4)
1. The preparation method of the breathable casting film comprises the steps that the breathable casting film is of a layered structure and is formed by compounding a core layer and surface layers arranged on two sides of the core layer; the method is characterized in that: the method comprises the following steps:
the core layer component and the surface layer component are melted and co-extruded, cooled, stretched, shaped, wound, soaked in a water tank and dried to obtain the breathable casting film;
the surface layer comprises the following components in parts by weight:
55-75 parts of metallocene linear low density polyethylene;
20-35 parts of high-pressure polyethylene;
15-25 parts of breathable master batch;
the core layer comprises the following components in parts by weight:
16.5-20.5 parts of linear low density polyethylene;
12-16 parts of high-pressure polyethylene;
60-65 parts of breathable master batch;
the breathable master batch comprises high-density polyethylene, polyethylene glycol and butanediol;
in the surface layer components, the breathable master batch is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.2-0.4) to 0.2-0.4;
in the core layer component, the breathable master batch is formed by mixing high-density polyethylene, polyethylene glycol and butanediol according to the weight ratio of 1 (0.4-0.6) to 0.4-0.6;
the metallocene linear low density polyethylene has a melt flow rate of 3.0-4.0g/10min and a density of 0.925-0.929g/cm 3 Metallocene linear low density polyethylene and melt flow rate of 1.5-2.5g/10min, density of 0.916-0.929g/cm 3 The metallocene linear low density polyethylene has a melt flow rate of 3.0-4.0g/10min and a density of 0.925-0.929g/cm 3 Metallocene linear low density polyethylene and melt flow rate of 1.5-2.5g/10min, density of 0.916-0.929g/cm 3 The weight ratio of the metallocene linear low density polyethylene is 1.5 to 1.7;
in the process of soaking the rolled film in a water tank, the breathable master batches in the core layer and the surface layer are contacted with water, and polyethylene glycol and butanediol are dissolved by the water, so that the micropore number of the obtained breathable casting film is further increased, and the breathable waterproof performance of the obtained breathable casting film is improved.
2. The method for producing a breathable cast film according to claim 1, characterized in that: the melt flow rate of the high-density polyethylene is 8.0-10g/10min, and the molecular weight of the polyethylene glycol is 400-600.
3. The method for producing a breathable cast film according to claim 1, characterized in that: the grain diameter of the breathable master batch is 0.2-0.8mm.
4. The method for producing a breathable cast film according to claim 1, characterized in that: the stretching step comprises cold stretching and hot stretching, wherein the temperature of the cold stretching is 30-40 ℃, and the stretching ratio is 1.5-1.7; the temperature of the hot stretching is 90-110 ℃, and the stretching ratio is 1.8-1.9.
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| CN202210209452.5A CN114851660B (en) | 2022-03-03 | 2022-03-03 | Breathable casting film and preparation method thereof |
| PCT/CN2023/079090 WO2023165531A1 (en) | 2022-03-03 | 2023-03-01 | Air-permeable cast film and preparation method therefor |
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| CN202210209452.5A CN114851660B (en) | 2022-03-03 | 2022-03-03 | Breathable casting film and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009297935A (en) * | 2008-06-11 | 2009-12-24 | Toppan Printing Co Ltd | Moistureproof packaging material |
| CN103030863A (en) * | 2012-12-28 | 2013-04-10 | 广东美联新材料股份有限公司 | Air-permeable masterbatch and fabrication method of air-permeable film with masterbatch |
| CN107353485A (en) * | 2016-05-10 | 2017-11-17 | 合肥杰事杰新材料股份有限公司 | A kind of antibacterial, ventilating film master batch and preparation method thereof |
| CN109203616A (en) * | 2018-07-11 | 2019-01-15 | 汪培杰 | A kind of three-layer co-extruded casting films and preparation method thereof |
| KR20200018755A (en) * | 2018-08-10 | 2020-02-20 | 이정운 | Upper for shoes with protected high water-pressure and moisture permeability properties |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2020012010A (en) * | 2018-05-11 | 2021-01-29 | Owens Corning Intellectual Capital Llc | Reinforced breathable sheet. |
| CN112046108A (en) * | 2020-08-31 | 2020-12-08 | 广东鼎孚新材料科技有限公司 | Fresh food keeps fresh and uses ventilative bag |
| CN114851660B (en) * | 2022-03-03 | 2024-03-26 | 上海紫华薄膜科技有限公司 | Breathable casting film and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009297935A (en) * | 2008-06-11 | 2009-12-24 | Toppan Printing Co Ltd | Moistureproof packaging material |
| CN103030863A (en) * | 2012-12-28 | 2013-04-10 | 广东美联新材料股份有限公司 | Air-permeable masterbatch and fabrication method of air-permeable film with masterbatch |
| CN107353485A (en) * | 2016-05-10 | 2017-11-17 | 合肥杰事杰新材料股份有限公司 | A kind of antibacterial, ventilating film master batch and preparation method thereof |
| CN109203616A (en) * | 2018-07-11 | 2019-01-15 | 汪培杰 | A kind of three-layer co-extruded casting films and preparation method thereof |
| KR20200018755A (en) * | 2018-08-10 | 2020-02-20 | 이정운 | Upper for shoes with protected high water-pressure and moisture permeability properties |
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| CN114851660A (en) | 2022-08-05 |
| WO2023165531A1 (en) | 2023-09-07 |
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