Preparation method of polyolefin microporous breathable film

A polyolefin and breathable film technology, applied in the field of preparation of polyolefin microporous breathable films, can solve the problems of reducing the usage of plastic products and the like

Active Publication Date: 2020-04-21
上海紫华薄膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the current environment of "plastic restriction" and "plastic reduction", the demand for re

Method used

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  • Preparation method of polyolefin microporous breathable film
  • Preparation method of polyolefin microporous breathable film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0021] The preparation process of the polyolefin microporous air-permeable membrane of the present embodiment is as follows:

[0022] Step 1), blending and extruding: mixing the polyolefin base material and the inorganic filler according to a weight ratio of 1:1, obtaining a composite material through a blending and extrusion process, and obtaining composite material particles through a granulation process;

[0023] The polyolefin substrate used in Examples 1-3 is a mixture of metallocene polyethylene and linear low-density polyethylene in a weight ratio of 1:1; wherein, the melt index of metallocene polyethylene is 1.3g / 10min, and the density is 0.927g / cm 3 , is the Exceed series product that is purchased from Exxon Company; The melt index of linear low density polyethylene is 1.0g / 10min, and density is 0.930g / cm 3 , is the DOWLEX series product purchased from DOW Company;

[0024] The inorganic filler used in Examples 1-3 is a mixture of calcium carbonate and titanium dio...

Embodiment 1

[0028] Example 1, in the above step 3), the draw ratio is about 5.5, and the obtained basis weight is a microporous air-permeable membrane of 10gsm;

Embodiment 2

[0029] Embodiment 2, in the above step 3), the draw ratio is about 4.5, and the obtained basis weight is a microporous air-permeable membrane of 12gsm;

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Abstract

The invention relates to a preparation method of a polyolefin microporous breathable film. According to the method, process improvement is conducted on the basis of the prior art, a tape casting process is changed into a film blowing process, and it is accidentally found that when a polyolefin base material of a specific formula is adopted and specific parameters are adopted in the film blowing process, the microporous breathable film which is lower in basis weight and still keeps excellent high moisture permeability can be obtained; moreover, it is also accidentally found that the hydrostaticpressure resistance of the polyolefin microporous breathable film is further improved, the anti-leakage performance is better, and the use safety of hygienic products can be more effectively guaranteed.

Description

technical field [0001] The invention relates to a preparation method of a polyolefin microporous air-permeable film, belonging to the technical field of organic polymer films. Background technique [0002] In recent years, the use of various personal hygiene products has become more and more popular; the use of polyolefin microporous breathable film, which has the function of regulating humidity, is also more and more popular in sanitary products; the main purpose is to improve the humidity and stuffiness when using sanitary products. feel. [0003] Chinese patent CN106397918B discloses a high-moisture-permeable polyolefin microporous air-permeable membrane, which achieves a basis weight range of 18-25gsm, and the water vapor transmission rate can reach more than 8000g / m2·24h in the GB / T 1037 test. The water vapor transmission rate of the film can reach 1000g / m2·h in the first hour. The high-moisture-permeable polyolefin microporous breathable film is aimed at the use envi...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K3/26C08K3/22C08J5/18C08J9/00
CPCC08J5/18C08J9/00C08J2323/06C08J2423/08C08J2323/08C08J2423/06C08K2003/265C08K2003/2241C08K2201/003C08J2205/044
Inventor 曹继刚许雍董仁金张爱华
Owner 上海紫华薄膜科技有限公司
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