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Biaxially oriented polypropylene waterproof breathable film and preparation method thereof

A waterproof and breathable film, two-way stretching technology, applied in the field of film manufacturing, can solve the problems of poor toughness and adhesion of the film, uneven hole formation on the surface of the film, and difficult non-woven composite, etc., to achieve good electrical insulation, vertical and horizontal The effect of uniform and stable performance and easy molding

Inactive Publication Date: 2019-02-01
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The PP waterproof and breathable film processed by the above-mentioned patented processing technology still has certain shortcomings: in terms of the process method, its preparation process only carries out longitudinal stretching, the surface of the film is unevenly formed, and the breathable effect is not good.
Judging from the product formula, the amount of polypropylene added in the film formula is very small, and the toughness and adhesion of the film produced are poor, and it is not easy to compound with non-woven fabrics.

Method used

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  • Biaxially oriented polypropylene waterproof breathable film and preparation method thereof
  • Biaxially oriented polypropylene waterproof breathable film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] The preparation method of the biaxially stretched polypropylene waterproof breathable membrane of the present embodiment comprises the following steps:

[0026] S1. Take 30 parts of homopolypropylene resin, 50 parts of heavy calcium carbonate powder, 1 part of coupling agent, 10 parts of linear low-density polyethylene resin and 12 parts of low-density polyethylene, mix and extrude to make pellets, Then it is added to the twin-screw extruder; in the twin-screw extruder, it is heated at 240-242°C to become a molten state, and the resulting melt is filtered through a 400-mesh filter and extruded into a film through a single-layer die. A high-pressure air knife attaches the diaphragm to a chilled roller for rapid cooling to form a cast sheet.

[0027] S2. The cast sheet prepared in step S1 is preheated at 130-132° C., and then longitudinally stretched 4.5 times at 120-122° C. to obtain a thick film.

[0028] S3. After the thick film prepared in step S2 is preheated at 175...

Embodiment 2

[0031] The preparation method of the biaxially stretched polypropylene waterproof breathable membrane of the present embodiment comprises the following steps:

[0032] S1, get 31 parts of homopolypropylene resin, 51 parts of heavy calcium carbonate powder, 1 part of coupling agent, 8 parts of linear low density polyethylene resin and 10 parts of low density polyethylene and mix and extrude to make pellets, then Add it to the twin-screw extruder; in the twin-screw extruder, it is heated at 242-246°C to become a molten state, and the obtained melt is filtered through a 400-mesh filter, and then extruded into a film through a single-layer die. The air knife attaches the film to the chilled roller and quenches it to form a cast sheet.

[0033] S2. The cast sheet obtained in step S1 is preheated at 132-136° C., and then longitudinally stretched 4.8 times at 122-126° C. to obtain a thick film.

[0034] S3. After the thick film prepared in step S2 is preheated at 177-178°C, it is tr...

Embodiment 3

[0037] The preparation method of the biaxially stretched polypropylene waterproof breathable membrane of the present embodiment comprises the following steps:

[0038] S1, get 32 ​​parts of homopolypropylene resin, 52 parts of heavy calcium carbonate powder, 2 parts of coupling agent, 5 parts of linear low-density polyethylene resin and 6 parts of low-density polyethylene and mix and extrude to make pellets, then Add it to the twin-screw extruder; in the twin-screw extruder, heat it to a molten state at 246-250 ° C, and the resulting melt is filtered through a 400-mesh filter, and then extruded into a film through a single-layer die. The air knife attaches the film to the chilled roller and quenches it to form a cast sheet.

[0039] S2. The cast sheet obtained in step S1 is preheated at 136-140° C., and stretched longitudinally at 126-130° C. by 5.2 times to obtain a thick film.

[0040] S3. After the thick film prepared in step S2 is preheated at 178-180°C, it is transversel...

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Abstract

The invention relates to a biaxially oriented polypropylene waterproof breathable film and a preparation method thereof. The waterproof breathable film is composed of the following components in partsby weight: 30-32 parts of homo-polypropylene resin, 50-52 parts of heavy calcium carbonate powder, 1-2 parts of a coupling agent, 5-10 parts of linear low-density polyethylene resin and 6-12 parts oflow-density polyethylene. The biaxially oriented polypropylene waterproof and breathable film prepared according to the formula and the method disclosed by the invention is more excellent in mechanical property and better in toughness, has more uniform and stable longitudinal and transverse properties, has moisture permeability obviously superior to moisture permeability of a similar product prepared by a tape casting method, can be applied to medical sanitary product packaging, food packaging, daily-use products and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of film production, in particular to a biaxially stretched polypropylene waterproof and breathable film and a preparation method thereof. Background technique [0002] Highly breathable polyolefin film is a new type of polymer material product, which is a product of high-grade synthetic resin development and deep processing projects. This product has a wide range of applications, mainly used in medical and sanitary product packaging, food packaging and daily packaging, etc. It has a broad market space and strong demand. [0003] At present, the breathable films on the market are basically made by casting method. On the one hand, the production capacity is low; Difference. For example, the patent CN103978653A discloses a PP waterproof and breathable film processing technology. According to the mass parts, 4 parts of polypropylene, 5 parts of calcium carbonate powder, and 0.5 parts of coupling agent are mixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/08C08L23/06C08K3/26C08J5/18B29C55/14B29L7/00
CPCB29C55/143B29L2007/00C08J5/18C08J2323/12C08J2423/06C08J2423/08C08K2003/265
Inventor 彭超
Owner ANHUI GUOFENG PLASTIC
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