CN107746499B - Biaxial stretching ventilated membrane - Google Patents
Biaxial stretching ventilated membrane Download PDFInfo
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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
- C08L23/08—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
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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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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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
- 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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- 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
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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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
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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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
- 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
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention provides a biaxially oriented breathable film and a preparation method thereof, relating to the technical field of high polymer materials, wherein the biaxially oriented breathable film is prepared from the following raw materials: polyethylene, superfine calcium carbonate powder, antibacterial master batch, rheological agent and dispersing agent; the invention adopts the biaxial stretching technology of firstly blowing the film and transversely stretching and then longitudinally stretching, has simple forming process, high film forming rate, low cost, wide processing range of polyethylene resin, convenient control of processing conditions, good film forming property of the resin, easy processing and film forming, and the breathable film prepared by matching with raw materials has high strength and good air permeability.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a biaxially oriented breathable film and a preparation method thereof.
Background
In recent years, with the improvement of the consumption level of people, the popularization rate of various personal sanitary products is higher and higher; the product structure and appearance homogeneity of the sanitary product is more and more serious; in recent years, manufacturers of sanitary products have been increasing their comfort while ensuring their basic functions (i.e., no leakage after absorption of liquid). In the aspect of improving the comfort level of the product, manufacturers mainly reduce the stimulation of the fabric to the skin by using the skin-friendly and soft fabric; use of a light, thin core structure to improve comfort when worn; the use of a base film with a humidity-regulating effect, such as a polyolefin microporous breathable film, improves the damp stuffiness of the sanitary article during use.
Although the polyolefin microporous breathable film has a production history of about 20 years in China, the quality problems of low hydrostatic pressure, easy leakage in the using process and the like still exist in part of breathable film products. In order to solve the problem of permeability of the breathable film, quite a plurality of breathable film manufacturers can only realize the permeability by increasing the basis weight of the film, so that the basis weight of the polyolefin microporous breathable film product which is mainstream in the market at present is 20-35 gsm. When improving the ventilated membrane basis weight, will probably lead to the ventilated membrane moisture permeability to appear showing the decline, the vapor that permeates through in the unit interval is on the low side promptly, can't effectively promote health supplies's comfort level.
In recent years, waterproof breathable films are widely used in various fields, and the waterproof breathable films mainly adopt nano-grade calcium carbonate as a raw material and have the defects of high thickness, low hydrostatic pressure, poor air permeability and the like.
Disclosure of Invention
The invention aims to provide a biaxially oriented breathable film and a preparation method thereof, and solves the technical problems of large thickness, large longitudinal and transverse mechanical property difference and low hydrostatic pressure of the breathable film in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 30-60 parts of polyethylene, 20-70 parts of superfine calcium carbonate powder, 10-18 parts of antibacterial master batch, 1-6 parts of rheological agent and 3-7 parts of dispersing agent.
Preferably, the biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 40-50 parts of polyethylene, 25-30 parts of superfine calcium carbonate powder, 12-16 parts of antibacterial master batch, 2-5 parts of rheological agent and 4-6 parts of dispersing agent.
Preferably, the antibacterial master batch is prepared from the following components in parts by weight: 22-30 parts of organic antibacterial agent, 20-30 parts of inorganic antibacterial agent and 10-25 parts of polyolefin carrier resin.
Preferably, the linear low density polyethylene has a melt index of 0.1 to 2g/10min at a temperature of 190 ℃ and a load of 2.16kg and a molecular weight distribution of 2 to 8. The low-density linear polyethylene resin particles have a small Melt Index (MI) and thus provide a film having good physical and mechanical properties. In addition, the polyethylene has wide relative molecular weight distribution, the molecular weight distribution has direct influence on the processability of the resin, and the product with wide molecular weight distribution has better processability than the product with narrow molecular weight distribution. This is because the products with a broad molecular weight distribution contain a certain proportion of low molecular weight polymers which act as plasticizers during processing, so that the processing range is broad, the processing conditions are easy to control, and the film-forming properties of the resin are good. The polyethylene is formed by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 1.0-4.0. Preferably, the polyethylene is a mixture of low density polyethylene and linear low density polyethylene according to the weight ratio of 1: 3.5.
Preferably, the superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid; the particle size of the superfine calcium carbonate powder is 0.1-100 microns, and the particle size is preferably 1-8 microns. The powder purity of the superfine calcium carbonate powder is more than 98 percent, and the whiteness is more than 96 percent. The amount of the ultrafine calcium carbonate powder added is 40 to 70 mass%, and more preferably 50 to 65 mass%, based on the polyethylene. The resin acid is diterpene resin acid in rosin, has a tricyclic skeleton structure, contains two double bonds and two active centers of a carboxyl group in most parts, and comprises conjugated double bond type (abietic acid type) resin acid and non-conjugated double bond type (pimaric acid type) resin acid.
Preferably, the inorganic antibacterial agent is one of a nano-silica silver ion-loaded antibacterial agent, a nano-titanium dioxide silver ion-loaded antibacterial agent and a nano-zinc oxide silver ion-loaded antibacterial agent; the organic antibacterial agent is one of quaternary ammonium salt antibacterial agent, phenol antibacterial agent and imidazole antibacterial agent.
Preferably, the rheological agent is at least one of simethicone, high-molecular polysiloxane and low-molecular polyamide resin; the dispersing agent is at least one of dodecyl amine polyoxyethylene ether, stearic acid monoanhydride, ethylene bis stearamide and gamma-aminopropyl triethoxysilane.
A preparation method of a biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, extruding and granulating the mixed material prepared in the step S2 by a double-screw extruder to prepare a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine by adopting an up-blowing process, wherein the screw of the film blowing machine is in a single screw form, the length-diameter ratio of the screw is 30:1, the maximum rotating speed of the screw is 100r/min, the temperature of a cylinder of the film blowing machine is 140-200 ℃, and the temperature of a neck mold is 160-180 ℃;
s5, cooling the film blow-molded in the step S4 by air cooling, clamping by a herringbone plate, and sequentially carrying out the working procedures of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 1.5-4.0 times;
s6, carrying out heat setting treatment on the film obtained after stretching, wherein the heat setting temperature is controlled at 110-135 ℃.
Preferably, the blow-up ratio in the blown film forming of step S4 is 1.0 to 5.0;
the invention provides a biaxial stretching breathable film and a preparation method thereof, and compared with the prior art, the biaxial stretching breathable film has the advantages that:
according to the invention, the superfine calcium carbonate powder treated by resin acid is added into the raw material formula for preparing the breathable film, so that the interface compatibility of the superfine calcium carbonate powder and the polyolefin polymer is improved, the superfine calcium carbonate powder can be uniformly dispersed in the polyolefin polymer, the mechanical property of the breathable film can be improved by the superfine calcium carbonate powder, and the thickness of the breathable film can be reduced under the condition of meeting the use requirement so as to improve the breathability and the processability of the breathable film; the antibacterial property of the breathable film is increased by adding the antibacterial master batch, the processing performance is good, the material produced by using the breathable film has high air permeability, is safe and sanitary, does not irritate the skin after being contacted with a human body for a long time, and has wide popularization market in the fields of medical treatment, special industrial protection, agricultural production, industrial packaging and the like.
The polyethylene resin has wide processing range, convenient control of processing conditions, good film forming property and easy processing and film forming; in addition, the polyethylene has small melt index and wide relative molecular weight distribution, so that the performance requirement of the film can be met, the processing characteristic of the resin can be ensured, and the strength of the film after film forming is good. The raw materials are combined and proportioned, and the rheological agent and the dispersing agent are added to further improve the compatibility of the superfine calcium carbonate powder, the antibacterial master batch and the polymer, so that the superfine calcium carbonate powder, the antibacterial master batch and the polymer are uniformly dispersed in the polymer, and the produced breathable film is uniform in breathability.
The invention adopts the film blowing and stretching technology, namely, the film is firstly subjected to transverse inflation and stretching in the film blowing process, and then subjected to the working procedures of preheating, longitudinal stretching, sizing and cooling and the like after being cooled, the film is subjected to transverse inflation and stretching and longitudinal stretching, when the bonding force of the inorganic filler and the polymer around the inorganic filler is smaller than the polymer deformation force caused by stretching, the polymer can be separated along the edge of inorganic filler particles, thus generating micropores, the transverse stretching is 1.0-5.0 times, the longitudinal stretching is 1.5-4.0 times, and the micropore size is matched with the superfine calcium carbonate powder with the particle size of 0.1-100 microns, so that the controllability of the formed micropores is high, the yield of the produced product is high, and the production cost is reduced.
The biaxially oriented breathable film of the invention has the characteristic of thin thickness, and the minimum square gram weight of the film is 15g/m2Compared with the prior art, the square gram weight of the breathable film can be reduced to 8g/m2The material is reduced, the efficiency is increased, and the energy is saved; meanwhile, the breathable film disclosed by the invention is subjected to transverse and longitudinal stretching treatment, so that the breathable film is high in mechanical property and rich and developed nano pores, and has excellent water pressure resistance, high air permeability and balanced longitudinal and transverse mechanical properties.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 30 parts of polyethylene, 20 parts of superfine calcium carbonate powder, 10 parts of antibacterial master batch, 1 part of dimethyl silicone oil rheological agent and 3 parts of dodecyl amine polyoxyethylene ether dispersing agent.
Wherein the melt index of the polyethylene at the temperature of 190 ℃ and under the load of 2.16kg is 0.1-2g/10min, and the molecular weight distribution is 2-8; the polyethylene is prepared by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 3.0. The superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid. The particle size of the superfine calcium carbonate powder is 50 microns. The powder purity of the superfine calcium carbonate powder is 98.5 percent, and the whiteness is 96.5 percent.
The antibacterial master batch is prepared from the following components in parts by weight: mixing 22 parts of quaternary ammonium salt antibacterial agent, 20 parts of nano silicon dioxide silver ion-loaded antibacterial agent and 10 parts of polyolefin carrier resin to prepare antibacterial master batch;
the preparation method of the biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, preheating the extruder to 125 ℃, keeping the temperature for 10min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by using a double-screw extruder to obtain the composite material.
S4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 80r/min, the temperature of a machine barrel of the film blowing machine is 160 ℃, the temperature of a film blowing die head of the film blowing machine is 180 ℃, and the inflation ratio is 3.0 during film blowing molding.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 1.5 times.
And S6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 110 ℃.
This example gives a breathable film having a grammage of 10.2g/m2The thickness was 8.8. mu.m.
Example 2
The biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 60 parts of polyethylene, 35 parts of superfine calcium carbonate powder, 18 parts of antibacterial master batch, 6 parts of macromolecular polysiloxane rheological agent and 7 parts of stearic acid mono-anhydride dispersing agent.
Wherein the melt index of the polyethylene at 190 ℃ under the load of 2.16kg is 0.1-2g/10min, and the molecular weight distribution is 2-8. The polyethylene is prepared by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 3.5. The superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid. The grain size of the superfine calcium carbonate powder is 100 microns; the superfine calcium carbonate powder has the powder purity of 99.5% and the whiteness of 98%. The antibacterial master batch is prepared from the following components in parts by weight: 30 parts of phenol antibacterial agent, 30 parts of nano titanium dioxide loaded silver ion antibacterial agent and 25 parts of polyolefin carrier resin are mixed to prepare the antibacterial master batch.
The preparation method of the biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, preheating the extruder to the temperature of 150 ℃, keeping the temperature for 15min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by using a double-screw extruder to obtain the composite material.
S4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 18r/min, the barrel temperature of the film blowing machine is 200 ℃, the die temperature is 160 ℃, and the inflation ratio is 5 during film blowing molding.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 4.0 times.
And S6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 135 ℃.
This example gives a breathable film having a grammage of 8.1g/m2The thickness was 2.0. mu.m.
Example 3
The biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 45 parts of polyethylene, 28 parts of superfine calcium carbonate powder, 14 parts of antibacterial master batch, 3 parts of low-molecular polyamide resin rheological agent and 5 parts of ethylene bis stearamide dispersing agent.
Wherein the melt index of the polyethylene at the temperature of 190 ℃ and under the load of 2.16kg is 0.1-2g/10min, and the molecular weight distribution is 2-8; the polyethylene is formed by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 3.0; the superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid; the grain size of the superfine calcium carbonate powder is 60 microns; the powder purity of the superfine calcium carbonate powder is 99 percent, and the whiteness is 97; the antibacterial master batch is prepared from the following components in parts by weight: uniformly mixing 26 parts of imidazole antibacterial agent, 25 parts of nano zinc oxide loaded silver ion antibacterial agent and 18 parts of polyolefin carrier resin to obtain antibacterial master batch;
the preparation method of the biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, preheating the extruder to 137 ℃, keeping the temperature for 13min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by the extruder to obtain the composite material.
S4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 14r/min, the barrel temperature of the film blowing machine is 140 ℃, the die temperature is 160 ℃, and the inflation ratio during film blowing molding is 4.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 3 times.
And S6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 122 ℃.
This example gives a breathable film having a grammage of 8.6g/m2The thickness was 2.6. mu.m.
Example 4
The biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 40 parts of polyethylene, 25 parts of superfine calcium carbonate powder, 12 parts of antibacterial master batch, 2 parts of rheological agent and 4 parts of dispersing agent.
Wherein the melt index of the polyethylene at 190 ℃ under the load of 2.16kg is 0.1-2g/10min, and the molecular weight distribution is 2-8. The polyethylene is prepared by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 3.0. The superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid; the particle size of the superfine calcium carbonate powder is 20 microns. The powder purity of the superfine calcium carbonate powder is more than 98 percent, and the whiteness is more than 96 percent. The antibacterial master batch is prepared from the following components in parts by weight: 25 parts of phenol antibacterial agent, 22 parts of nano titanium dioxide supported silver ion antibacterial agent and 15 parts of polyolefin carrier resin.
The preparation method of the biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, extruding and granulating the mixed material prepared in the step S2 through a double-screw extruder to obtain the composite material.
S4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 12r/min, the barrel temperature of the film blowing machine is 170 ℃, the die temperature is 170 ℃, and the inflation ratio is 3 during film blowing molding.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 1.7 times.
And S6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 115 ℃.
This example gives a breathable film having a grammage of 9.1g/m2The thickness was 2.9. mu.m.
Example 5
The biaxially oriented breathable film is prepared from the following raw materials in parts by weight: 50 parts of polyethylene, 30 parts of superfine calcium carbonate powder, 16 parts of antibacterial master batch, 5 parts of rheological agent and 6 parts of dispersing agent.
Wherein the melt index of the polyethylene at 190 ℃ under the load of 2.16kg is 0.1-2g/10min, and the molecular weight distribution is 2-8. The polyethylene is prepared by mixing low-density polyethylene and linear low-density polyethylene according to the weight ratio of 1: 3.0. The superfine calcium carbonate powder is superfine calcium carbonate treated by resin acid; the particle size of the superfine calcium carbonate powder is 70 microns; the powder purity of the superfine calcium carbonate powder is more than 98 percent, and the whiteness is more than 96 percent; the antibacterial master batch is prepared from the following components in parts by weight: 28 parts of organic antibacterial agent, 7 parts of inorganic antibacterial agent and 20 parts of polyolefin carrier resin.
The preparation method of the biaxially oriented breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, preheating the extruder to 140 ℃, keeping the temperature for 14min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by the extruder to obtain a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 16r/min, the barrel temperature of the film blowing machine is 190 ℃, the die temperature is 170 ℃, and the inflation ratio during film blowing molding is 2.9.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 2 times.
And S6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 130 ℃.
This example gives a breathable film having a grammage of 8.3g/m2The thickness was 2.4. mu.m.
Comparative example 1:
the breathable film of the comparative example is prepared from the following raw materials in parts by weight: 45 parts of polyethylene, 28 parts of calcium carbonate powder, 14 parts of antibacterial master batch, 3 parts of low-molecular polyamide resin rheological agent and 5 parts of ethylene bis stearamide dispersing agent. Wherein, the calcium carbonate powder is a conventional material which is not processed.
The preparation method of the breathable film of the comparative example comprises the following steps:
s1, weighing the raw materials in parts by weight.
S2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; and then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material.
S3, preheating the extruder to 125 ℃, keeping the temperature for 13min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by using a double-screw extruder to obtain the composite material.
S4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 14r/min, the barrel temperature of the film blowing machine is 180 ℃, the die temperature is 170 ℃, and the inflation ratio is 4 during film blowing molding.
And S5, cooling the film formed by blowing in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and sequentially carrying out the processes of preheating, stretching and the like, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 3 times.
And S6, carrying out heat setting treatment on the composite material, wherein the heat setting temperature is controlled at 122 ℃.
Comparative example 2
The breathable film of the comparative example is prepared from the following raw materials in parts by weight: 45 parts of polyethylene, 14 parts of antibacterial master batch, 3 parts of low molecular polyamide resin rheological agent and 5 parts of ethylene bis stearamide dispersing agent.
The method for preparing the breathable film of the comparative example is the same as that of comparative example 1 except for the step of adding the raw material calcium carbonate powder.
Comparative example 3
The breathable film of the comparative example is prepared from the following raw materials in parts by weight: 45 parts of polyethylene, 3 parts of low molecular polyamide resin rheological agent and 5 parts of ethylene bis stearamide dispersing agent.
The steps of adding the raw material calcium carbonate powder and the antibacterial master batch are removed, and the preparation method of the breathable film in the comparative example is the same as that in comparative example 1.
The biaxially oriented breathable films prepared in examples 1-5 and the breathable films prepared in comparative examples 1-3 were subjected to air permeability, tensile strength, tear strength, and water pressure resistance tests, the test results are shown in table 1, and the specific test methods are as follows:
air permeability: testing according to GB1037-19887 standard. Tensile strength: the test was carried out according to item 9 of GB1040-2008, at a test temperature of 23. + -. 2 ℃ and a drawing speed of 500 mm/min. 5 samples were tested and the results averaged.
TABLE 1 results of Performance testing of various samples
As can be seen from the performance test result data in Table 1, the biaxially oriented breathable films prepared in examples 1-5 of the present invention have good tear strength, water pressure resistance, air permeability and tensile strength.
Compared with the existing casting breathable film, the square gram weight of the breathable film can be greatly reduced, and the breathable film has the technical effects of material reduction, efficiency increase and energy conservation; meanwhile, the breathable film disclosed by the invention is subjected to transverse and longitudinal stretching treatment, so that the breathable film is high in mechanical property and rich and developed nano pores, and has excellent water pressure resistance, high air permeability and balanced longitudinal and transverse mechanical properties.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; as will be readily apparent to those skilled in the art from the disclosure herein, the present invention may be practiced without these specific details; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (5)
1. A biaxially oriented breathable film, characterized in that: the biaxial stretching breathable film is prepared from the following raw materials in parts by weight: 30 parts of polyethylene, 20 parts of superfine calcium carbonate powder, 10 parts of antibacterial master batch, 1 part of dimethyl silicone oil rheological agent and 3 parts of dodecyl amine polyoxyethylene ether dispersing agent; the antibacterial master batch is prepared from the following components in parts by weight: mixing 22 parts of quaternary ammonium salt antibacterial agent, 20 parts of nano silicon dioxide silver ion-loaded antibacterial agent and 10 parts of polyolefin carrier resin to obtain the antibacterial agent; wherein the polyethylene is prepared by mixing low density polyethylene and linear low density polyethylene according to the weight ratio of 1:3.0, the melt index of the polyethylene is 0.1-2g/10min at the temperature of 190 ℃ and under the load of 2.16kg, and the molecular weight distribution is 2-8; the particle size of the superfine calcium carbonate powder is 50 microns, and the superfine calcium carbonate powder is treated by resin acid;
the method for preparing the biaxial stretching breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material;
s3, preheating the extruder to 125 ℃, keeping the temperature for 10min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by using a double-screw extruder to obtain a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 80r/min, the temperature of a machine barrel of the film blowing machine is 160 ℃, the temperature of a film blowing die head of the film blowing machine is 180 ℃, and the inflation ratio is 3.0 during film blowing molding;
s5, cooling the film formed by blowing the film in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and then sequentially carrying out preheating and stretching processes, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 1.5 times;
s6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 110 ℃;
the square gram weight of the biaxial stretching breathable film prepared by the method is 10.2g/m2The thickness is 8.8 mu m; the tear strength was 11N; the water pressure resistance is 3250mm/H2O; tensile strength in the longitudinal direction is 121MPa, and tensile strength in the transverse direction is 130 MPa.
2. A biaxially oriented breathable film, characterized in that: the biaxial stretching breathable film is prepared from the following raw materials in parts by weight: 60 parts of polyethylene, 35 parts of superfine calcium carbonate powder, 18 parts of antibacterial master batch, 6 parts of high-molecular polysiloxane rheological agent and 7 parts of stearic acid mono-anhydride dispersing agent; the antibacterial master batch is prepared from the following components in parts by weight: mixing 30 parts of phenolic antibacterial agent, 30 parts of nano titanium dioxide loaded silver ion antibacterial agent and 25 parts of polyolefin carrier resin to prepare the antibacterial agent; wherein the polyethylene is prepared by mixing low density polyethylene and linear low density polyethylene according to the weight ratio of 1:3.5, the melt index of the polyethylene is 0.1-2g/10min at the temperature of 190 ℃ and under the load of 2.16kg, and the molecular weight distribution is 2-8; the particle size of the superfine calcium carbonate powder is 100 microns, and the superfine calcium carbonate is obtained after resin acid treatment;
the method for preparing the biaxial stretching breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material;
s3, preheating the extruder to the temperature of 150 ℃, keeping the temperature for 15min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by using a double-screw extruder to prepare the composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 18r/min, the barrel temperature of the film blowing machine is 200 ℃, the die temperature is 160 ℃, and the inflation ratio is 5 during film blowing molding;
s5, cooling the film formed by blowing the film in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and then sequentially carrying out preheating and stretching processes, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 4.0 times;
s6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 135 ℃;
the square gram weight of the biaxial stretching breathable film prepared by the method is 8.1g/m2The thickness is 2.0 mu m; the tear strength was 12N; the water pressure resistance is 3263mm/H2O; the longitudinal tensile strength is 128MPa, and the transverse tensile strength is 125 MPa.
3. A biaxially oriented breathable film, characterized in that: the biaxial stretching breathable film is prepared from the following raw materials in parts by weight: 45 parts of polyethylene, 28 parts of superfine calcium carbonate powder, 14 parts of antibacterial master batch, 3 parts of low-molecular polyamide resin rheological agent and 5 parts of ethylene bis stearamide dispersing agent; the antibacterial master batch is prepared from the following components in parts by weight: uniformly mixing 26 parts of imidazole antibacterial agent, 25 parts of nano zinc oxide-loaded silver ion antibacterial agent and 18 parts of polyolefin carrier resin to obtain the nano zinc oxide-loaded silver ion antibacterial agent; wherein the polyethylene is prepared by mixing low density polyethylene and linear low density polyethylene according to the weight ratio of 1:3.0, the melt index of the polyethylene is 0.1-2g/10min at the temperature of 190 ℃ and under the load of 2.16kg, and the molecular weight distribution is 2-8; the particle size of the superfine calcium carbonate powder is 60 microns, and the superfine calcium carbonate powder is treated by resin acid;
the method for preparing the biaxial stretching breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material;
s3, preheating the extruder to 137 ℃, keeping the temperature for 13min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by the extruder to obtain a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 14r/min, the barrel temperature of the film blowing machine is 140 ℃, the die temperature is 160 ℃, and the inflation ratio is 4 during film blowing molding;
s5, cooling the film formed by blowing the film in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and then sequentially carrying out preheating and stretching processes, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 3 times;
s6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 122 ℃;
the square gram weight of the biaxial stretching breathable film prepared by the method is 8.6g/m2The thickness is 2.6 mu m; the tear strength was 15N; the water pressure resistance is 3397mm/H2O; longitudinal tensile strength 133MPa, transverse tensile strength 139 MPa.
4. A biaxially oriented breathable film, characterized in that: the biaxial stretching breathable film is prepared from the following raw materials in parts by weight: 40 parts of polyethylene, 25 parts of superfine calcium carbonate powder, 12 parts of antibacterial master batch, 2 parts of rheological agent and 4 parts of dispersing agent; the antibacterial master batch is prepared from the following components in parts by weight: 25 parts of phenol antibacterial agent, 22 parts of nano titanium dioxide silver ion-loaded antibacterial agent and 15 parts of polyolefin carrier resin; wherein the polyethylene is prepared by mixing low density polyethylene and linear low density polyethylene according to the weight ratio of 1:3.0, the melt index of the polyethylene is 0.1-2g/10min at the temperature of 190 ℃ and under the load of 2.16kg, and the molecular weight distribution is 2-8; the particle size of the superfine calcium carbonate powder is 20 microns, and the superfine calcium carbonate powder is treated by resin acid;
the method for preparing the biaxial stretching breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material;
s3, extruding and granulating the mixed material prepared in the step S2 by a double-screw extruder to prepare a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 12r/min, the barrel temperature of the film blowing machine is 170 ℃, the die temperature is 170 ℃, and the inflation ratio is 3 during film blowing molding;
s5, cooling the film formed by blowing the film in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and then sequentially carrying out preheating and stretching processes, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 1.7 times;
s6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 115 ℃;
the square gram weight of the biaxial stretching breathable film prepared by the method is 9.1g/m2The thickness is 2.9 mu m; the tear strength is 10N; the water pressure resistance is 3290mm/H2O; tensile strength 118MPa in the longitudinal direction and 121MPa in the transverse direction.
5. A biaxially oriented breathable film, characterized in that: the biaxial stretching breathable film is prepared from the following raw materials in parts by weight: 50 parts of polyethylene, 30 parts of superfine calcium carbonate powder, 16 parts of antibacterial master batch, 5 parts of rheological agent and 6 parts of dispersing agent; the antibacterial master batch is prepared from the following components in parts by weight: 28 parts of organic antibacterial agent, 7 parts of inorganic antibacterial agent and 20 parts of polyolefin carrier resin; wherein the polyethylene is prepared by mixing low density polyethylene and linear low density polyethylene according to the weight ratio of 1:3.0, the melt index of the polyethylene is 0.1-2g/10min at the temperature of 190 ℃ and under the load of 2.16kg, and the molecular weight distribution is 2-8; the particle size of the superfine calcium carbonate powder is 70 microns, and the superfine calcium carbonate powder is treated by resin acid;
the method for preparing the biaxial stretching breathable film comprises the following steps:
s1, weighing the raw materials in parts by weight;
s2, putting the superfine calcium carbonate powder and the dispersing agent into a mixer, and uniformly mixing; then adding polyethylene, the antibacterial master batch and the rheological agent for uniform mixing to obtain a mixed material;
s3, preheating the extruder to 140 ℃, keeping the temperature for 14min when the preheating temperature is reached, and extruding and granulating the mixed material prepared in the step S2 by the extruder to obtain a composite material;
s4, performing film blowing molding on the composite material prepared in the step S3 on a film blowing machine table, wherein the screw form of the film blowing machine table is a single screw, the length-diameter ratio of the screw of the film blowing machine is 30:1, the rotating speed of the screw is 16r/min, the barrel temperature of the film blowing machine is 190 ℃, the die temperature is 170 ℃, and the inflation ratio during film blowing molding is 2.9;
s5, cooling the film formed by blowing the film in the step S4 by air cooling, clamping by a herringbone plate, transiting by a transition roller, and then sequentially carrying out preheating and stretching processes, wherein the preheating temperature is 70-90 ℃, the stretching temperature is 80-95 ℃, and the longitudinal stretching ratio is 2 times;
s6, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is controlled at 130 ℃;
the square gram weight of the biaxial stretching breathable film prepared by the method is 8.3g/m2The thickness is 2.4 mu m; the tear strength was 12N; the water pressure resistance is 3302mm/H2O; tensile strength in the longitudinal direction of 119MPa and tensile strength in the transverse direction of 132 MPa.
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| CN108485235A (en) * | 2018-03-30 | 2018-09-04 | 泉州市泉港顶新日用品有限公司 | A kind of preparation method of beam mouth Breathable anti-skidding gloves |
| CN108485236A (en) * | 2018-03-30 | 2018-09-04 | 泉州市泉港顶新日用品有限公司 | A kind of beam mouth Breathable anti-skidding gloves |
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| CN110483868A (en) * | 2019-08-30 | 2019-11-22 | 重庆和泰润佳股份有限公司 | A kind of permeable resin and high-elongation are blow molded ventilated membrane |
| CN110901196A (en) * | 2019-11-26 | 2020-03-24 | 杭州明日软包装有限公司 | Tearing-resistant moisture permeable desiccant packaging material and production process thereof |
| CN112852048A (en) * | 2021-01-12 | 2021-05-28 | 中广核俊尔(浙江)新材料有限公司 | PE (polyethylene) breathable film material as well as preparation method and application thereof |
| CN113547768A (en) * | 2021-06-30 | 2021-10-26 | 平湖展鹏热熔胶膜有限公司 | Preparation method of biaxially oriented medical crack film |
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| CN114736445A (en) * | 2022-04-07 | 2022-07-12 | 上海大学 | Antibacterial flame-retardant polyethylene material and preparation method thereof, antibacterial flame-retardant polyethylene film and preparation method thereof |
| CN115093598A (en) * | 2022-06-17 | 2022-09-23 | 宁波鸿雁包装材料有限公司 | Preparation method of degradable breathable film |
| CN115322473A (en) * | 2022-09-02 | 2022-11-11 | 海塑(泉州)新材料有限公司 | Continuous production process of PE breathable film |
| CN116790123A (en) * | 2023-05-26 | 2023-09-22 | 东莞市欣荣天丽科技实业有限公司 | Food deoxidizer and preparation method thereof |
| CN116769411B (en) * | 2023-08-24 | 2023-10-17 | 广州博达医疗用品有限公司 | Disposable antibacterial surgical membrane and preparation method thereof |
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