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Polyolefin microporous air-permeable film and preparation method thereof

The technology of polyolefin and breathable film is applied in the field of polyolefin microporous breathable film and its preparation to achieve the effects of reducing the steps of sewing and gluing and sealing, improving the process interval and achieving great economic benefits.

Active Publication Date: 2016-10-12
SHANGHAI ZIHUA FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages of high-gas-permeable film that cannot meet the high-temperature and high-pressure process environment of fusion sewing, resulting in many shortcomings after processing with needle sewing equipment, and to provide a polyolefin microporous gas-permeable film. A polyolefin microporous breathable film with high air permeability and mechanical properties, without affecting the processing performance of the product, and improving the high temperature and high pressure resistance of the film and its preparation method; the polyolefin microporous breathable film produced by the present invention mainly Applied to disposable medical and special industrial protective products, but not limited to the above applications

Method used

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  • Polyolefin microporous air-permeable film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The polyolefin microporous air-permeable film involved in this embodiment is made of polyolefin substrate filled surface with calcium carbonate filler treated by coating method, and then extruded, cast, stretched, heat-set and film-forming process. In terms of components, it consists of random copolymerized polypropylene, linear low-density polyethylene, low-density polyethylene, and calcium carbonate filler blends whose surface has been treated by coating methods; among them, the melt index of random copolymerized polypropylene 0.5~10g / 10min, density 0.890~0.915g / cm 3 ;The melt index of linear low density polyethylene is 1~4g / 10min, and the density is 0.915~0.940g / cm 3 ;The melt index of low-density polyethylene is 2-7g / 10min, and the density is 0.910-0.925g / cm 3 Concrete consumption of each component is as shown in Table 1.

[0029] The preparation process of the polyolefin microporous air-permeable membrane of this embodiment specifically includes the following ste...

Embodiment 2

[0035] The polyolefin microporous air-permeable film and its preparation method involved in this embodiment are the same as those in Embodiment 1, except that:

[0036] 1. The dosage of components is different, see Table 1 for details;

[0037]2. The air-permeable particles are extruded and melted by a casting extruder, and the melt temperature is kept at 245-250°C;

[0038] 3. The heat setting temperature is controlled at 85°C;

[0039] 4. Perform uniaxial two-step stretching on the film, and the stretching ratio is controlled at 2.0.

[0040] Relevant performance tests were carried out on the prepared microporous breathable membrane with a basis weight of 55 gsm, and the results are shown in Table 1.

Embodiment 3

[0042] The polyolefin microporous air-permeable film and its preparation method involved in this embodiment are the same as those in Embodiment 1, except that:

[0043] 1. The dosage of components is different, see Table 1 for details;

[0044] 2. The air-permeable particles are extruded and melted by a casting extruder, and the melt temperature is kept at 250-255°C;

[0045] 3. The heat setting temperature is controlled at 70°C;

[0046] 4. Perform uniaxial two-step stretching on the film, and the stretching ratio is controlled at 2.5.

[0047] Relevant performance tests were carried out on the prepared microporous breathable membrane with a basis weight of 55 gsm, and the results are shown in Table 1.

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Abstract

The invention discloses a polyolefin microporous air-permeable membrane and a preparation method thereof. The microporous air-permeable membrane is prepared from a polyolefin substrate filled with a calcium carbonate filler with processed surface by means of casting extruding, stretching, and heat setting and film-forming. During the preparation, the polyolefin and the calcium carbonate filler with the processed surface are blended, extruded and pelletized, so as to prepare air-permeable particles; the air-permeable particles are extruded and molten by a casting extruder; the melt temperature is kept at 240-255 DEG C; the melt is continuously extruded to form a film through a die lip clearance of a T-shaped die head of a casting machine; the film is subjected to one-step or two-step stretching in a uniaxial manner; the draw ratio is controlled to be 1.5-2.5; the film obtained in the stretching manner is subjected to heat setting treatment at the heat setting temperature of 70-85 DEG C. The polyolefin microporous air-permeable membrane disclosed by the invention can ensure high air permeability and mechanical property of the microporous air-permeable membrane, meanwhile, the processing performance of the product is not affected, and the resistance to high temperature and high pressure of the film is also improved.

Description

technical field [0001] The invention relates to the technical field of production technology of air-permeable microporous membranes, in particular to a polyolefin microporous air-permeable membrane with high air permeability and high temperature and high pressure resistance and a preparation method thereof. The materials produced by the present invention are mainly used in disposable medical and special industrial protection products, but not limited to the above applications. Background technique [0002] With the advancement of medical and special industrial protection technology, the amount and scope of use of disposable protective products have gradually expanded. In order to meet the requirements of liquid barrier properties, solid dust barrier properties, and user comfort greater than that allowed by air-tight materials while controlling product costs, multi-layer PP non-woven fabrics and high-breathability films are sprayed with glue. The production process of making...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L23/08C08L23/06C08K9/04C08K3/26B29C69/00
CPCB29C48/0018B29C48/11C08J5/18C08J2323/14C08J2423/06C08J2423/08C08L23/14C08L2201/08C08L2203/14C08L2203/16C08L2205/03C08L2207/066C08L2207/14C08L23/0815C08L23/06C08K9/04C08K2003/265
Inventor 许雍张爱华汪洋
Owner SHANGHAI ZIHUA FILM TECH CO LTD
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