CN113480796A - Breathable film and preparation method thereof - Google Patents
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- CN113480796A CN113480796A CN202110669006.8A CN202110669006A CN113480796A CN 113480796 A CN113480796 A CN 113480796A CN 202110669006 A CN202110669006 A CN 202110669006A CN 113480796 A CN113480796 A CN 113480796A
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- 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
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- 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
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- 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
- C08J2323/08—Copolymers of ethene
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- 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
- C08J2423/06—Polyethene
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- 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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
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- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
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- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- 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
- C08K3/02—Elements
- C08K3/04—Carbon
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- 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
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
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Abstract
The invention discloses a breathable film, which relates to the technical field of high polymer materials and comprises the following components in parts by weight: 1-6 parts of polypropylene, 40-60 parts of linear low-density polyethylene, 1-6 parts of high-density polyethylene and 1-50 parts of inorganic filler. The invention provides a breathable film, which is prepared by optimizing the material selection of the breathable film, compounding polypropylene, linear low-density polyethylene, high-density polyethylene and inorganic filler as materials for producing the breathable film, adopting a novel film blowing process and a film blowing and longitudinal stretching process, and has the advantages that the obtained final product has better air permeability, fewer holes and black spots of the produced film are few, and the quality of the product is greatly improved.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a breathable film and a preparation method thereof.
Background
The breathable film is a breathable and waterproof functional film material and is mainly used for personal hygiene care products such as baby diapers, sanitary napkins for women, medical protective clothing and the like. Traditional ventilated membrane preparation adopts the curtain coating technology, and the ventilated membrane of preparation is thin inadequately, and air permeability is relatively poor, and hydrostatic pressure and physical tensile strength are not enough, and especially transverse tensile strength is relatively poor, lead to the product to appear the phenomenon of wire drawing easily in personal hygiene care products production process, lead to stopping after the wire drawing, scrap scheduling problem, seriously influence the productivity effect.
Disclosure of Invention
Accordingly, the present invention is directed to a breathable film and method of making the same that overcomes the above-mentioned deficiencies of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a breathable film comprises the following components in parts by weight: 1-6 parts of polypropylene, 40-60 parts of linear low-density polyethylene, 1-6 parts of high-density polyethylene and 1-50 parts of inorganic filler.
The invention provides a breathable film, which is prepared by optimizing the material selection of the breathable film and compounding polypropylene, linear low-density polyethylene, high-density polyethylene and inorganic filler, so that the breathable film is better in breathability of the obtained final product, few holes and black spots of the produced film are generated, and the quality of the product is greatly improved.
Preferably, the breathable film comprises the following components in parts by weight: 1-3 parts of polypropylene, 40-55 parts of linear low-density polyethylene, 1-3 parts of high-density polyethylene and 30-45 parts of inorganic filler. The inventor of the application finds that the film obtained by adopting the selection of the components and the parts by weight has better air permeability, almost no holes and black spots of the film, high product quality and good performances in all aspects through a large amount of creative experimental researches.
Preferably, the breathable film comprises the following components in parts by weight: 2 parts of polypropylene, 50 parts of linear low-density polyethylene, 2 parts of high-density polyethylene and 44 parts of inorganic filler. The inventor of the application finds that the air permeability of the obtained film is optimal, holes and black spots of the film are almost not generated, the product quality is high, and the performances in all aspects are optimal when the specific components and the weight parts are selected.
Preferably, the polypropylene is a random copolymer polypropylene; the melt index of the random copolymerized polypropylene is 0.5 to 2.0g/10min, the melt index of the random copolymerized polypropylene is measured according to ASTM D1238 using 2.16kg weight and at a temperature of 230 ℃; the linear low density polyethylene has a melt index of 0.5 to 2.0g/10min, as measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 190 ℃; the high density polyethylene has a melt index of 0.5 to 2.0g/10min, as measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 190 ℃. The invention selects random copolymerization polypropylene, linear low density polyethylene and high density polyethylene with a certain range of melt index, and the obtained film has better final air permeability and higher strength.
Preferably, the melt index of the random copolymer polypropylene is 2.0g/10min, the melt index of the linear low density polyethylene is 1g/10min, and the melt index of the high density polyethylene is 1g/10 min. The inventor of the application finds that the final air permeability of the obtained film is optimal and the strength is highest by adopting the material with the specific melt index through a large amount of creative experimental researches.
Preferably, the inorganic filler is at least one of calcium carbonate, montmorillonite, kaolin, barium sulfate, carbon black and titanium dioxide. The inorganic filler is a compound of calcium carbonate and titanium dioxide; the weight ratio of the calcium carbonate to the titanium dioxide is as follows: calcium carbonate: titanium dioxide powder is 6-50: 1. the particle size of the calcium carbonate is 1-5 mu m, and the particle size of the titanium dioxide is 0.1-0.5 mu m. The inventor of the application discovers through a large amount of creative experimental research that when the compound of calcium carbonate and titanium dioxide is adopted, the transverse tension of the obtained film is stronger and the performances in all aspects are good by adopting the components and proportion selection.
Further preferably, the weight ratio of the calcium carbonate to the titanium dioxide is as follows: calcium carbonate: titanium dioxide 25: 1; the particle size of the calcium carbonate is 1 mu m, and the particle size of the titanium dioxide is 0.3 mu m. The inventor of the application discovers through a large amount of creative experimental research that when the compound of calcium carbonate and titanium dioxide is adopted in a specific proportion, the obtained film has the best transverse tension and the best performances in all aspects.
Preferably, the breathable film further comprises the following components in parts by weight: 0.1-5 parts of an auxiliary agent. Preferably, the auxiliary agent comprises at least one of a lubricant, a dispersant, and an antioxidant.
In addition, the application provides a preparation method of the breathable film, which is characterized by comprising the following steps:
(1) uniformly mixing polypropylene, linear low-density polyethylene, high-density polyethylene, inorganic filler and an auxiliary agent to obtain a mixed material;
(2) drying the mixed material, adding the dried mixed material into an extruder, and extruding and granulating the dried mixed material by a double-screw extruder to obtain a composite material;
(3) and (3) after the composite material is subjected to film blowing molding by using a film blowing machine, a longitudinal stretching process is adopted, and the breathable film is obtained after rolling.
Preferably, in the step (2), the temperature of the extruder is 160-240 ℃; in the step (3), the length-diameter ratio of a screw of the film blowing machine is 29: 1, the blow-up ratio during film blowing forming is 2-7; the longitudinal stretching ratio is 1.5-5.5 times.
Further preferably, in the step (3), the blow-up ratio in the blown film forming is 5; the longitudinal draw ratio was 5 times.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a breathable film, which is prepared by optimizing the material selection of the breathable film, compounding polypropylene, linear low-density polyethylene, high-density polyethylene and inorganic filler as materials for producing the breathable film, adopting a novel film blowing process and a film blowing and longitudinal stretching process, and has the advantages that the obtained final product has better air permeability, fewer holes and black spots of the produced film are few, and the quality of the product is greatly improved.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
The compositions and weight part selections of inventive arrangements examples 1-9, specific examples 1-5 are shown in table 1, the melt index of the inventive random copolymer polypropylene is measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 230 ℃, and the melt index of the linear low density polyethylene, high density polyethylene is measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 190 ℃:
TABLE 1 selection of Components and parts by weight for specific examples 1-5
The preparation method of the breathable film of the embodiment 1-5 comprises the following steps:
(1) uniformly mixing polypropylene, linear low-density polyethylene, high-density polyethylene, inorganic filler and an auxiliary agent to obtain a mixed material;
(2) drying the mixed materials in the table 1, adding the dried mixed materials into an extruder, and extruding and granulating the dried mixed materials by a double-screw extruder to obtain a composite material, wherein the temperature of the extruder is 185 ℃;
(3) after the composite material is subjected to film blowing forming by using a film blowing machine, the length-diameter ratio of a screw of the film blowing machine is 29: 1, the blow-up ratio during film blowing forming is 5; and the longitudinal stretching ratio is 5 times, and the breathable film is obtained after rolling by adopting a longitudinal stretching process.
Compared with the embodiment 5, the components and the parts by weight of the embodiments 6 to 9 of the invention are completely the same, and the preparation method is different:
example 6 the temperature of the extruder in the step (2) was 200 ℃ and the other preparation methods were completely the same as in example 5;
example 7 the temperature of the extruder in the step (2) was 240 ℃ and the other preparation methods were completely the same as in example 5;
example 8 the blow-up ratio at the time of the blown film forming in the step (3) was 2, and the other preparation methods were completely the same as those in example 5;
example 9 the longitudinal stretching ratio in step (3) was 5.5 times, and the other preparation methods were exactly the same as example 5.
Meanwhile, the invention is provided with comparative examples, and specific comparative examples are provided as shown in the following table 2:
table 2 comparative example component and part by weight selection
Comparative example 1 contains no random copolymerized polypropylene, 100 parts by weight, and is filled with inorganic filler; the rest components, the weight parts and the preparation method are completely the same as the embodiment 5;
comparative example 2 contains no high density polyethylene, 100 parts by weight, and is filled with inorganic filler; the rest components, the weight parts and the preparation method are completely the same as the embodiment 5;
in comparative example 3, the weight parts of the random copolymerization polypropylene are 8 parts, the total parts are 100 parts, and inorganic fillers are used for filling; the rest components, the weight parts and the preparation method are completely the same as the embodiment 5;
comparative example 4 the high density polyethylene was 8 parts by weight, 100 parts by weight total, filled with inorganic filler; the rest components, the weight parts and the preparation method are completely the same as the embodiment 5;
in comparative example 5, the linear low density polyethylene was used in an amount of 30 parts by weight and 100 parts by weight in total, and the components were filled with an inorganic filler; the rest components, the weight parts and the preparation method are completely the same as the embodiment 5;
in comparative example 6, the melt index of the random copolymerized polypropylene is 3, the melt index of the linear low density polyethylene is 4, and the rest components, parts by weight and preparation method are completely the same as those of example 5;
in comparative example 7, the inorganic filler is a compound of calcium carbonate and titanium dioxide; the weight ratio of the calcium carbonate to the titanium dioxide is as follows: calcium carbonate: titanium white powder 70: 1, the rest components, the parts by weight and the preparation method are completely the same as the embodiment 5;
in the comparative example 8, the inorganic filler is a compound of calcium carbonate and titanium dioxide; the weight ratio of the calcium carbonate to the titanium dioxide is as follows: calcium carbonate: titanium dioxide powder is 1: 1, the rest components, the parts by weight and the preparation method are completely the same as the embodiment 5;
in the comparative example 9, the inorganic filler is a compound of calcium carbonate and titanium dioxide; the particle size of the calcium carbonate is 8 μm, the particle size of the titanium dioxide is 1 μm, and the rest components, the parts by weight and the preparation method are completely the same as those in the embodiment 5.
Effect example 1 Performance test
And (4) testing standard: air permeability was tested according to method GB 1037-1988; the test temperature is 23 +/-0.6 ℃, and the test humidity is 90 +/-2%; the sample is flat and uniform, and has no defects of holes, pinholes, wrinkles, scratches and the like; three samples were taken for each group and the average was calculated.
The tensile strength was measured according to article 9 of the national standard 1040-.
The black spot holes are generally standardized in terms of number per square meter as follows: 0-1 black dots per square meter, 0.000002 holes per square meter, the area of the holes is less than 10 square millimeters.
And (3) testing results: as shown in tables 3 and 4 below:
TABLE 3 Performance test
Table 4 black dot hole data
As can be seen from Table 3, the breathable films prepared in the examples of the present application have good air permeability and strength, and example 5 is the best mode of the present application, in which WVT reached 3160g/m224h, the transverse tensile strength is 2.5N/inch, the longitudinal tensile strength is 11N/inch, and all the performances can well meet the requirements. Comparative examples 1-2 lack some of the components of the formulation of the present invention, comparative examples 3-5 are selected by weight out of the range provided by the present invention, comparative example 6 are selected by melt index of each component out of the range provided by the present invention, and comparative examples 7-9 are selected by filler out of the further preferred range of the present invention, and have certain differences from the examples of the present invention in view of air permeability and strength of the finally prepared breathable film, and the synergistic effect and the lack of the components of the present invention are not possible.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The breathable film is characterized by comprising the following components in parts by weight: 1-6 parts of polypropylene, 40-60 parts of linear low-density polyethylene, 1-6 parts of high-density polyethylene and 1-50 parts of inorganic filler.
2. The breathable film of claim 1, comprising the following components in parts by weight: 1-3 parts of polypropylene, 40-55 parts of linear low-density polyethylene, 1-3 parts of high-density polyethylene and 30-45 parts of inorganic filler.
3. The breathable film of claim 2, comprising the following components in parts by weight: 2 parts of polypropylene, 50 parts of linear low-density polyethylene, 2 parts of high-density polyethylene and 44 parts of inorganic filler.
4. A breathable film according to any one of claims 1 to 3, wherein said polypropylene is a random copolymer polypropylene; the melt index of the random copolymerized polypropylene is 0.5 to 2.0g/10min, the melt index of the random copolymerized polypropylene is measured according to ASTM D1238 using 2.16kg weight and at a temperature of 230 ℃;
the linear low density polyethylene has a melt index of 0.5 to 2.0g/10min, as measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 190 ℃;
the high density polyethylene has a melt index of 0.5 to 2.0g/10min, as measured according to ASTM D1238 using a weight of 2.16kg and at a temperature of 190 ℃.
5. The breathable film of claim 4, wherein the random copolymer polypropylene has a melt index of 2.0g/10min, the linear low density polyethylene has a melt index of 1g/10min, and the high density polyethylene has a melt index of 1g/10 min.
6. The breathable film of any one of claims 1-3, wherein said inorganic filler is at least one of calcium carbonate, montmorillonite, kaolin, barium sulfate, carbon black, titanium dioxide.
7. The breathable film of claim 6, wherein the inorganic filler is a blend of calcium carbonate and titanium dioxide; the weight ratio of the calcium carbonate to the titanium dioxide is as follows: calcium carbonate: titanium dioxide powder is 6-50: 1.
8. the breathable film of any of claims 1-3, further comprising the following components in parts by weight: 0.1-5 parts of an auxiliary agent; the auxiliary agent comprises at least one of a lubricant, a dispersant and an antioxidant.
9. A process for making a breathable film according to claim 6, comprising the steps of:
(1) uniformly mixing polypropylene, linear low-density polyethylene, high-density polyethylene, inorganic filler and an auxiliary agent to obtain a mixed material;
(2) drying the mixed material, adding the dried mixed material into an extruder, and extruding and granulating the dried mixed material by a double-screw extruder to obtain a composite material;
(3) and (3) after the composite material is subjected to film blowing molding by using a film blowing machine, a longitudinal stretching process is adopted, and the breathable film is obtained after rolling.
10. The method for preparing a breathable film of claim 8, wherein in step (2), the temperature of the extruder is 160 ℃ to 240 ℃; in the step (3), the length-diameter ratio of a screw of the film blowing machine is 29: 1, the blow-up ratio during film blowing forming is 2-7; the longitudinal stretching ratio is 1.5-5.5 times.
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