CN112778600A - Special material for polyolefin breathable film and preparation method and application thereof - Google Patents
Special material for polyolefin breathable film and preparation method and application thereof Download PDFInfo
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- CN112778600A CN112778600A CN202011588130.3A CN202011588130A CN112778600A CN 112778600 A CN112778600 A CN 112778600A CN 202011588130 A CN202011588130 A CN 202011588130A CN 112778600 A CN112778600 A CN 112778600A
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- breathable film
- polyolefin
- polyethylene
- polyolefin breathable
- film
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- 229920000098 polyolefin Polymers 0.000 title claims abstract description 122
- 239000000463 material Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 86
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 43
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 32
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 30
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 30
- 239000011342 resin composition Substances 0.000 claims abstract description 24
- 239000002270 dispersing agent Substances 0.000 claims abstract description 22
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 18
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 18
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 18
- 229920001684 low density polyethylene Polymers 0.000 claims description 27
- 239000004702 low-density polyethylene Substances 0.000 claims description 27
- 239000000155 melt Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 238000009998 heat setting Methods 0.000 claims description 14
- 230000035699 permeability Effects 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 239000003607 modifier Substances 0.000 claims description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 229920005672 polyolefin resin Polymers 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 229920001912 maleic anhydride grafted polyethylene Polymers 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 2
- 239000002245 particle Substances 0.000 abstract description 16
- 239000004698 Polyethylene Substances 0.000 abstract description 13
- -1 polyethylene Polymers 0.000 abstract description 13
- 229920000573 polyethylene Polymers 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000013386 optimize process Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 7
- 150000008301 phosphite esters Chemical class 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- HHKVOYUYPYZFHJ-SOFGYWHQSA-N (e)-3-(3,4-dihydroxyphenyl)-1-phenylprop-2-en-1-one Chemical compound C1=C(O)C(O)=CC=C1\C=C\C(=O)C1=CC=CC=C1 HHKVOYUYPYZFHJ-SOFGYWHQSA-N 0.000 description 1
- 201000004624 Dermatitis Diseases 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 208000010668 atopic eczema Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010096 film blowing Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 208000026438 poor feeding Diseases 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 208000017520 skin disease Diseases 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/12—Surgeons' or patients' gowns or dresses
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/10—Impermeable to liquids, e.g. waterproof; Liquid-repellent
- A41D31/102—Waterproof and breathable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
Abstract
The invention discloses a special material for a polyolefin breathable film, and a preparation method and application thereof. The special material for the polyolefin breathable film comprises the following components in parts by weight: 45-55 parts of a polyethylene resin composition; 45-55 parts of micron-sized surface modified heavy calcium carbonate; 0.5-2 parts of a dispersing agent; 0.5-1 part of antioxidant. The invention improves the flexibility by optimizing low-density metallocene polyethylene and linear low-density polyethylene, and can prepare polyolefin breathable films with good appearance without film surface defects such as crystal points, pinholes and the like by optimizing calcium carbonate particle size distribution and high-efficiency dispersing agent; by adopting the special material for the polyolefin breathable film, and combining optimized process settings of low stretching temperature and high shaping temperature, the ratio of polyethylene molecular chains oriented in the stretching direction in the breathable film is reduced, so that the flexibility of the breathable film is improved, and the ultra-flexible high-breathable polyolefin breathable film is well prepared.
Description
Technical Field
The invention relates to the technical field of hygienic products, and particularly relates to a special material for a polyolefin breathable film, and a preparation method and application thereof.
Background
The polyolefin breathable film is widely applied to the field of sanitary products such as paper diapers, sanitary towels, disposable operating gowns and the like due to the breathable and waterproof characteristics of the polyolefin breathable film. The preparation process of the polyolefin breathable film comprises the steps of filling polyolefin with inorganic filler mainly comprising calcium carbonate for blending modification to prepare the material special for the breathable film, and then carrying out tape casting or film blowing and stretching to prepare the breathable film. In the stretching process, polyolefin resin and inorganic filler are desorbed at an interface and form tiny pores, so that the functions of ventilation and water resistance are realized. Because the softness and the air permeability of the baby diaper directly influence the comfort of the baby in wearing, and the diaper can be red and swollen on the buttocks of the baby and has skin diseases such as eczema and the like in severe cases, the market has higher and higher requirements on the aspects of the softness, the air permeability and the like of the breathable base membrane used for the baby diaper, and how to prepare the super-soft breathable base membrane is also a technical problem which needs to be solved urgently in the field.
CN107513197A discloses a waterproof breathable casting film composite material and a preparation method thereof, wherein the waterproof breathable casting film composite material is prepared from the following components in parts by weight: 42-47 parts of metallocene polyethylene, 3-8 parts of high-pressure polyethylene, 45-55 parts of inorganic filler, 0.1-1 part of antioxidant, 0.5-1 part of lubricant and 0.2-1 part of coupling agent, and the high-pressure polyethylene is prepared by mixing, extruding and granulating. The waterproof breathable cast film composite has certain breathability and mechanical properties, but needs further improvement, especially in breathability.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect and the defect that the air permeability and the flexibility of the existing polyolefin breathable film cannot meet the requirements of related applications, and provides a special material for the polyolefin breathable film.
The invention also aims to provide a preparation method of the special material for the polyolefin breathable film.
Still another object of the present invention is to provide a method for producing a polyolefin breathable film.
It is still another object of the present invention to provide a polyolefin breathable film.
The invention also aims to provide application of the polyolefin breathable film in preparation of baby diapers.
The above purpose of the invention is realized by the following technical scheme:
the special material for the polyolefin breathable film comprises the following components in parts by weight:
45-55 parts of a polyethylene resin composition; 45-55 parts of micron-sized surface modified heavy calcium carbonate; 0.5-2 parts of a dispersing agent; 0.5 to 1 part of an antioxidant,
wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene,
the density of the low-density polyethylene is 0.91-0.93 g/cm3(ii) a The density of the metallocene polyethylene is 0.91-0.93 g/cm3；
The micron-sized surface modified heavy calcium carbonate D50 is 1-3 um, and D100 is less than or equal to 10 um.
In the special material for the polyolefin breathable film, the low-density metallocene polyethylene and the linear low-density polyethylene are preferably selected, so that the molecular chain orientation of the breathable film in the stretching process can be reduced, the elastic modulus of the breathable film is reduced, the flexibility of the breathable film is improved, the pore size formed by interface stripping in the stretching process can be increased, the air permeability is improved, and the polyolefin breathable film with good appearance and no film surface defects such as crystal points, pinholes and the like can be prepared by preferably selecting the micron-sized calcium carbonate particle size distribution and the high-efficiency dispersing agent.
Among them, it should be noted that:
the surface modification of the micron-sized surface modified heavy calcium carbonate is mainly to improve the dispersing capacity of calcium carbonate, the prepared breathable film has no defects such as crystal points and the like, and a filter screen cannot be blocked in production.
The dispersant of the invention can be one or a combination of polyethylene wax, stearate, amide and high molecular dispersant.
The antioxidant can be one or a plurality of compositions of hindered phenols, phosphites and thioethers.
Preferably, the weight ratio of the linear low density polyethylene to the metallocene polyethylene in the polyethylene resin composition is 1:3 to 3: 1.
Wherein, the low-density polyethylene is added in a conventional amount, and is controlled to be 5-15% of the special material for the whole polyolefin breathable film.
Metallocene is excellent in processability but poor in processability, while linear low density polyethylene is good in processability but poor in properties, and therefore is blended to obtain suitable processability and properties.
Preferably, the low-density polyethylene melt index is 5-10 g/10 min. The processability of the breathable film can be further improved by the preference of the melt index of the low-density polyethylene.
Preferably, the linear low density polyethylene has a melt index of 0.25 to 5.0g/10 min.
Preferably, the melt index of the metallocene polyethylene is 0.25-5.0 g/10 min.
The low-density resin is preferably selected in the invention, and comprises linear low-density polyethylene and metallocene polyethylene, so that molecular chain orientation in post processing can be reduced, the elastic modulus of the breathable film can be reduced, and the flexibility of the breathable film can be improved.
The surface modified micron-sized heavy calcium carbonate is obtained by modifying one or more combined modifiers of stearic acid, titanate, aluminate, silane coupling agent and maleic anhydride grafted polyethylene wax.
Wherein, the surface modified micron-sized heavy calcium carbonate comprises two components of micron-sized heavy calcium carbonate and a modifier, wherein the content of the modifier is 0.8 to 1.2 percent of the total weight
The surface modifier is preferably selected to achieve a better surface treatment effect and to improve the dispersibility of the treated calcium carbonate.
The invention also specifically protects a preparation method of the special material for the polyolefin breathable film, which comprises the following steps: uniformly mixing the polyolefin resin composition, the dispersing agent and the antioxidant to obtain a mixture, feeding the mixture and the micron-sized surface modified heavy calcium carbonate into a double-screw extruder, melting, plasticizing and extruding, and granulating to obtain the special material for the polyolefin breathable film.
Wherein, it is required to be noted that:
the polyolefin resin composition, the dispersant and the antioxidant can be mixed uniformly by a high-speed mixer.
Preferably, the diameter of a screw of the double-screw extruder is 58-96 mm, the length-diameter ratio of the screw is 48-56, and the double-screw extruder is provided with a main feeding port and a side feeding system respectively.
Preferably, the extruder processing temperature of the double-screw extruder is set to be 160-240 ℃.
Preferably, in the preparation method of the special material for the polyolefin breathable film, the mixture and part of the micron-sized surface modified heavy calcium carbonate are added into a double-screw extruder through a main feeding port, and the rest of the micron-sized surface modified heavy calcium carbonate is added into the double-screw extruder through a side feeding system of the extruder, and more preferably, the mass ratio of the micron-sized surface modified heavy calcium carbonate added into the double-screw extruder through the main feeding port and the side feeding system is 1: 2.5-1: 1.
Calcium carbonate has a low bulk density due to its small particle size, and thus has poor feeding ability, and its productivity can be improved by the main side feeding system.
Preferably, the polyolefin breathable film special material obtained by cutting into granules is subjected to dehumidification drying and then finished product packaging, wherein the dehumidification drying temperature is 80-90 ℃.
In the application of the polyolefin breathable film special material to preparation of the polyolefin breathable film, the invention also provides a preparation method of the polyolefin breathable film, which comprises the following steps:
s1, melting, plasticizing and extruding the special material for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit type die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 2.0-3.5, setting the preheating temperature of the film to be 70-80 ℃ and the stretching temperature to be 75-80 ℃;
and S3, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is set to 95-105 ℃, and thus obtaining the polyolefin breathable film.
In the preparation method of the polyolefin breathable film, the ratio of polyethylene molecular chains oriented along the stretching direction in the breathable film is reduced through the process setting of combining the low stretching temperature and the high shaping temperature, so that the flexibility of the breathable film is improved.
The stretching ratio is preferably capable of further controlling the air permeability, the larger the stretching ratio is, the more pores are formed, the better the air permeability is, but the smaller the transverse tension is, the larger the thermal shrinkage is, the hole breaking and film breaking are easy to occur, and the production efficiency is influenced, so that the proper stretching ratio is required.
The polyolefin breathable film prepared by the method is also within the protection range of the invention, and the moisture permeability of the polyolefin breathable film is 2100-2900 g/m224h, the longitudinal strain at 5 percent corresponds to the tensile force of 1.2-1.7N.
Furthermore, the invention also specifically protects the application of the polyolefin breathable film in the related fields requiring the polyolefin breathable film with high air permeability and high flexibility, such as the fields of sanitary products such as paper diapers and disposable operating gowns, and particularly the application in the preparation of baby paper diapers.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a special material for a polyolefin breathable film, which can improve the flexibility of the breathable film by reducing the modulus of the breathable film by preferably selecting low-density metallocene polyethylene and linear low-density polyethylene, and can prepare the polyolefin breathable film with good appearance without film surface defects such as crystal points, pinholes and the like by preferably selecting calcium carbonate particle size distribution and high-efficiency dispersing agents.
The invention also provides a preparation method of the polyolefin breathable film, and the method adopts the process setting after the special material for the polyolefin breathable film is combined with optimization and the process setting combining the low stretching temperature and the high shaping temperature to reduce the proportion of polyethylene molecular chains oriented in the stretching direction in the breathable film, thereby improving the flexibility of the breathable film and well preparing the ultra-flexible high-breathable polyolefin breathable film.
The moisture permeability of the polyolefin breathable film is 2100-2900 g/m224h, the tension corresponding to 5% strain in the longitudinal direction is 1.2-1.7N, the fabric has excellent air permeability and flexibility, and can be widely applied to the field of sanitary products such as paper diapers and disposable operating gowns, particularly in the preparation of baby paper diapers.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
The main component sources of the invention are illustrated as follows:
low density polyethylene, from dow chemistry;
linear low density polyethylene is derived from exxonmobil and dow chemistry;
the metallocene polyethylene is from exxonmobil;
the micron-sized surface modified heavy calcium carbonate is prepared from England porcelain (Wen lake) Co., Ltd and Guangdong Shenglang white stone industry Co., Ltd;
the dispersing agent is polyethylene wax and is derived from HONEYWELL;
the antioxidant is hindered phenol and phosphite ester, and is from New Tianjin Lianlong Material GmbH.
The invention specifically detects the following properties:
the moisture permeability detection method comprises the following steps: GBT 12704.2-2009, wherein the temperature is 40 +/-2 ℃ and the relative humidity is 60 +/-2 percent.
The method for detecting the longitudinal tension and the transverse tension comprises the following steps: GBT 1040.3-2006
The detection method of the tensile force corresponding to the longitudinal 5% strain comprises the following steps: GBT 1040.3-2006
Example 1
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3The melt index is 3.5g/10 min;
the metallocene polyethylene has a density of 0.912g/cm3The melt index is 3.8g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 2um, the maximum particle size (D100) is 8um, the surface modifier is stearic acid, and the content is 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film comprises the following steps:
uniformly mixing the polyolefin resin composition, the dispersing agent and the antioxidant to obtain a mixture, adding the mixture and part of the micron-sized surface modified heavy calcium carbonate into a double-screw extruder through a main feeding port, adding the rest of the micron-sized surface modified heavy calcium carbonate into the double-screw extruder through a side feeding system of the extruder, melting, plasticizing, extruding and pelletizing to obtain the special material for the polyolefin breathable film.
The diameter of a screw of the double-screw extruder is 75mm, the length-diameter ratio is 52, the processing temperature is 200 ℃, and the mass ratio of calcium carbonate added into the double-screw extruder by the main feeding port and the side feeding system is 1:2.
A polyolefin breathable film prepared from a material special for polyolefin breathable films is prepared by the following specific method:
s1, melting, plasticizing and extruding a special material for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit type die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 2.4, setting the preheating temperature of the film to be 75 ℃ and the stretching temperature to be 80 ℃;
and S3, carrying out heat setting treatment on the stretched film, and setting the heat setting temperature to be 100 ℃ to obtain the polyolefin breathable film.
Example 2
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3The melt index is 3.5g/10 min;
the metallocene polyethylene has a density of 0.912g/cm3The melt index is 3.8g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 2um, the maximum particle size (D100) is 8um, the surface modifier is stearic acid, and the content is 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film comprises the following steps:
uniformly mixing the polyolefin resin composition, the dispersing agent and the antioxidant to obtain a mixture, adding the mixture and part of the micron-sized surface modified heavy calcium carbonate into a double-screw extruder through a main feeding port, adding the rest of the micron-sized surface modified heavy calcium carbonate into the double-screw extruder through a side feeding system of the extruder, melting, plasticizing, extruding and pelletizing to obtain the special material for the polyolefin breathable film.
The diameter of a screw of the double-screw extruder is 75mm, the length-diameter ratio is 52, the processing temperature is 200 ℃, and the mass ratio of calcium carbonate added into the double-screw extruder by the main feeding port and the side feeding system is 1:2.
A polyolefin breathable film prepared from a material special for polyolefin breathable films is prepared by the following specific method:
s1, melting, plasticizing and extruding a special material for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit type die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 2.8, setting the preheating temperature of the film to be 75 ℃ and the stretching temperature to be 80 ℃;
and S3, carrying out heat setting treatment on the stretched film, and setting the heat setting temperature to be 100 ℃ to obtain the polyolefin breathable film.
Example 3
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.918g/cm3The melt index is 3.5g/10 min;
the metallocene polyethylene has a density of 0.927g/cm3The melt index is 3.5g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 2um, the maximum particle size (D100) is 8um, the surface modifier is stearic acid, and the content is 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film comprises the following steps:
uniformly mixing the polyolefin resin composition, the dispersing agent and the antioxidant to obtain a mixture, adding the mixture and part of the micron-sized surface modified heavy calcium carbonate into a double-screw extruder through a main feeding port, adding the rest of the micron-sized surface modified heavy calcium carbonate into the double-screw extruder through a side feeding system of the extruder, melting, plasticizing, extruding and pelletizing to obtain the special material for the polyolefin breathable film.
The diameter of a screw of the double-screw extruder is 75mm, the length-diameter ratio is 52, the processing temperature is 200 ℃, and the mass ratio of calcium carbonate added into the double-screw extruder by the main feeding port and the side feeding system is 1:2.
A polyolefin breathable film prepared from a material special for polyolefin breathable films is prepared by the following specific method:
s1, melting, plasticizing and extruding a special material for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit type die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 2.4, setting the preheating temperature of the film to be 75 ℃ and the stretching temperature to be 80 ℃;
and S3, carrying out heat setting treatment on the stretched film, and setting the heat setting temperature to be 100 ℃ to obtain the polyolefin breathable film.
Example 4
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene, and the specific properties of each component are the same as those of example 1.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Example 5
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene, and the specific properties of each component are the same as those of example 1.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Example 6
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene, and the specific properties of each component are the same as those of example 1.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Example 7
The special material for the polyolefin breathable film comprises the components shown in the table 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene, and the specific properties of each component are the same as those of example 1.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Example 8
The special material for the polyolefin breathable film comprises the components shown in example 1 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.927g/cm3The melt index is 3.5g/10 min;
the metallocene polyethylene has a density of 0.912g/cm3The melt index is 3.8g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 2um, the maximum particle size (D100) is 8um, the surface modifier is stearic acid, and the content is 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Example 9
The special material for the polyolefin breathable film comprises the components shown in example 1 in parts by weight.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared from a material special for polyolefin breathable films is prepared by the following specific method:
s1, melting, plasticizing and extruding a special material for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit type die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 3.5, setting the preheating temperature of the film to be 75 ℃ and the stretching temperature to be 80 ℃;
and S3, carrying out heat setting treatment on the stretched film, and setting the heat setting temperature to be 100 ℃ to obtain the polyolefin breathable film.
TABLE 1
Comparative example 1
The special material for the polyolefin breathable film comprises the components shown in the table 2 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.935g/cm3The melt index is 2.5g/10 min;
the metallocene polyethylene has a density of 0.936g/cm3The melt index is 4.5g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 2um, the maximum particle size (D100) is 8um, the surface modifier is stearic acid, and the content is 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Comparative example 2
The special material for the polyolefin breathable film comprises the components shown in the table 2 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene.
The melt index of the low-density polyethylene is 8.0g/10 min;
the linear low density polyethylene has a density of 0.915g/cm3The melt index is 3.5g/10 min;
the metallocene polyethylene has a density of 0.912g/cm3The melt index is 3.8g/10 min;
the average particle size (D50) of the micron-sized surface modified heavy calcium carbonate is 0.9um, the maximum particle size (D100) is 9um, and the surface modifier is stearic acid with the content of 1.0 wt%;
the dispersing agent is polyethylene wax, and the addition amount is 1 wt%;
the antioxidant is hindered phenol and phosphite ester, and the total addition amount is 1 wt%.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Comparative example 3
The special material for the polyolefin breathable film comprises the components shown in the table 2 in parts by weight.
Wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene, and the specific properties of each component are the same as those of example 1.
The preparation method of the special material for the polyolefin breathable film is the same as that of the example 1.
A polyolefin breathable film prepared by the special material for the polyolefin breathable film, which is specifically prepared by the method in the embodiment 1.
Comparative example 4
A polyolefin breathable film prepared from a material special for polyolefin breathable films is prepared by the following steps:
s1, melting, plasticizing and extruding the special material (same as the embodiment 1) for the polyolefin breathable film through a casting extruder, continuously extruding a melt through a slit die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 1.8, setting the preheating temperature of the film to be 75 ℃ and the stretching temperature to be 80 ℃;
and S3, carrying out heat setting treatment on the stretched film, and setting the heat setting temperature to 80 ℃ to obtain the polyolefin breathable film.
TABLE 2
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Low density polyethylene | 8 | 8 | 8 | 8 |
| Linear low density polyethylene | 20 | 20 | 25 | 20 |
| Metallocene polyethylene | 20 | 20 | 25 | 20 |
| Micron-sized surface modified heavy calcium carbonate | 50 | 50 | 40 | 50 |
| Dispersing agent | 1 | 1 | 1 | 1 |
| Antioxidant agent | 1 | 1 | 1 | 1 |
Result detection
The prepared breathable film samples were subjected to the relevant performance tests, and the results are shown in table 3.
TABLE 3
The flexibility of the breathable film is represented by tensile force corresponding to longitudinal strain of 5%, the higher the value of the tensile force is, the stiffer the breathable film is, the lower the value of the tensile force is, and the softer the breathable film is. According to the scheme provided by the invention, the polyolefin breathable film with good appearance, super flexibility and high breathability can be prepared in the examples.
The corresponding transverse and longitudinal stretching properties of the super-flexible high-permeability polyolefin breathable film meet the relevant requirements.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The special material for the polyolefin breathable film is characterized by comprising the following components in parts by weight:
45-55 parts of a polyethylene resin composition; 45-55 parts of micron-sized surface modified heavy calcium carbonate; 0.5-2 parts of a dispersing agent; 0.5 to 1 part of an antioxidant,
wherein the polyethylene resin composition is a composition of low density polyethylene, linear low density polyethylene and metallocene polyethylene,
the density of the low-density polyethylene is 0.91-0.93 g/cm3(ii) a The density of the metallocene polyethylene is 0.91-0.93 g/cm3；
The micron-sized surface modified heavy calcium carbonate D50 is 1-3 um, and D100 is less than or equal to 10 um.
2. The polyolefin breathable film of claim 1, wherein the weight ratio of linear low density polyethylene to metallocene polyethylene in the polyethylene resin composition is from 1:3 to 3: 1.
3. The polyolefin breathable film of claim 1, wherein said low density polyethylene has a melt index of 5 to 10g/10min, said linear low density polyethylene has a melt index of 0.25 to 5.0g/10min, and said metallocene polyethylene has a melt index of 0.25 to 5.0g/10 min.
4. The polyolefin breathable film of claim 1, wherein the micron-sized surface-modified heavy calcium carbonate is a micron-sized surface-modified heavy calcium carbonate modified by one or more surface modifiers selected from stearic acid, titanate, aluminate, silane coupling agent, and maleic anhydride-grafted polyethylene wax.
5. A preparation method of the special material for the polyolefin breathable film, which is characterized by comprising the following steps: uniformly mixing the polyolefin resin composition, the dispersing agent and the antioxidant to obtain a mixture, feeding the mixture and the micron-sized surface modified heavy calcium carbonate into a double-screw extruder, melting, plasticizing and extruding, and granulating to obtain the special material for the polyolefin breathable film.
6. The method for preparing the material special for the polyolefin breathable film according to claim 5, wherein the temperature for melt plasticizing extrusion is 160-240 ℃.
7. The preparation method of the special polyolefin breathable film material as claimed in claim 5, wherein the mixture and part of the micron-sized surface modified heavy calcium carbonate are added into a twin-screw extruder through a main feeding port, and the rest of the micron-sized surface modified heavy calcium carbonate is added into the twin-screw extruder through a side feeding system of the extruder, wherein the mass ratio of the micron-sized surface modified heavy calcium carbonate added into the twin-screw extruder through the main feeding port and the side feeding system is 1: 2.5-1: 1.
8. A preparation method of a polyolefin breathable film is characterized by comprising the following steps:
s1, carrying out melt plasticizing extrusion on the special material for the polyolefin breathable film according to any one of claims 1-6 through a casting extruder, continuously extruding a melt through a slit die of a T-shaped die head of a casting machine, and cooling the melt into a film through a casting roll;
s2, performing unidirectional stretching on the film, controlling the stretching ratio to be 2.0-3.5, setting the preheating temperature of the film to be 70-80 ℃ and the stretching temperature to be 75-80 ℃;
and S3, carrying out heat setting treatment on the stretched film, wherein the heat setting temperature is set to 95-105 ℃, and thus obtaining the polyolefin breathable film.
9. The polyolefin breathable film prepared by the preparation method of the polyolefin breathable film according to claim 8, wherein the moisture permeability of the polyolefin breathable film is 2100-2900 g/m224h, the longitudinal strain at 5 percent corresponds to the tensile force of 1.2-1.7N.
10. Use of the polyolefin breathable film of claim 9 in the manufacture of baby diapers and disposable surgical gowns.
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