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Waterproof breathable film and preparation method thereof

A waterproof and breathable film technology, which is applied in the field of plastic films, can solve the problems of poor compatibility between inorganic fillers and polyethylene, inability to guarantee the waterproof and breathable ability of the film, and poor quality of micropore forming, so as to improve the waterproof and breathable performance and ensure waterproof and breathable Performance, the effect of improving binding ability

Active Publication Date: 2021-11-05
SHANGHAI ZIHUA FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inorganic filler and polyethylene in the above technology are simply mixed under heating conditions, and the compatibility between the inorganic filler and polyethylene is poor, and The binding force is weak, and then in the subsequent process of stretching the film, the quality of the micropore formation is poor, and then the good waterproof and breathable ability of the film cannot be guaranteed

Method used

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  • Waterproof breathable film and preparation method thereof
  • Waterproof breathable film and preparation method thereof
  • Waterproof breathable film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0062] An activated inorganic ultrafine filler is prepared by the following preparation steps:

[0063] a. Pretreatment: Preheat the inorganic ultrafine filler to 90°C, and vacuum stir and dry the inorganic ultrafine filler at a speed of 2000r / min. After the water content is lower than 0.3%, press 1:0.01 The weight ratio is added to the coupling agent, and the pretreatment is carried out for 6 minutes;

[0064] Wherein the coupling agent is a titanate coupling agent;

[0065] The particle size of the inorganic ultrafine filler is 1000-2000 mesh;

[0066] Inorganic superfine filler is light calcium carbonate;

[0067] b. Activation treatment: Activate the pretreated inorganic ultrafine filler and the activated sol at a weight ratio of 1:0.2 for 15 minutes at a pH of 7, a temperature of 140°C, and a rotational speed of 300r / min;

[0068] The activated sol is composed of sodium bicarbonate and amino resin in a weight ratio of 1:1.

preparation example 2

[0070] An activated inorganic ultra-fine filler, the difference from Preparation Example 1 is that the specific treatment steps of a are as follows: first preheat the inorganic ultra-fine filler to 100 ° C, and conduct the inorganic ultra-fine filler at a speed of 3000r / min Vacuum stirring and drying, after the water content is lower than 0.3%, then add coupling agent according to the weight ratio of 1:0.02, and carry out pretreatment for 8 minutes.

preparation example 3

[0072] An activated inorganic ultra-fine filler, the difference from Preparation Example 1 is that the specific treatment steps of a are as follows: first preheat the inorganic ultra-fine filler to 110 ° C, and conduct the inorganic ultra-fine filler at a speed of 4000r / min Vacuum stirring and drying, after the water content is lower than 0.3%, then add coupling agent according to the weight ratio of 1:0.025, and carry out pretreatment for 9 minutes.

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Abstract

The invention relates to the technical field of plastic packaging, in particular to a waterproof breathable film and a preparation method thereof. A waterproof breathable film comprises the following components by weight: 50-60 parts of low density polyethylene; 80-120 parts of linear low density polyethylene; 50-60 parts of medium density polyethylene; 100-150 parts of high density polyethylene; and 200-300 parts of activated inorganic superfine filler. The preparation method of the activated inorganic superfine filler comprises the following steps of: preheating inorganic superfine filler, stirring and drying in vacuum, and adding a coupling agent after drying; and heating and mixing the inorganic superfine filler and activated sol under an alkaline condition to obtain the activated inorganic superfine filler. The preparation method of the waterproof breathable film comprises the following steps of: S1, master batch preparing; S2, film casting; S3, preheating and stretching; S4, surface treatment; and S5, cutting and forming. The waterproof breathable film can be used for waterproof layers in sanitary products such as sanitary napkins and paper diapers, and has the advantages of being waterproof and breathable.

Description

technical field [0001] The application relates to the technical field of plastic films, more specifically, it relates to a waterproof and breathable film and a preparation method thereof. Background technique [0002] Nowadays, with the improvement of people's living standards, in order to meet people's more needs, various sanitary products appear in people's daily life, including baby diapers, sanitary napkins, sanitary pads, adult diapers and Take incontinence products, for example. The quality of the above-mentioned sanitary products depends on the waterproof and breathable ability of the waterproof layer. The existing waterproof layer is mainly made of waterproof and breathable film, which is a kind of inorganic filler filled polymer composite film material with a fine pore structure. The micropores allow The gas passes through, but it is blocked because the diameter of the liquid is larger than the diameter of the micropores, so it has the characteristics of "breathabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06C08L61/20C08L71/02C08K9/04C08K3/26C08K3/04C08K3/08C08J5/18
CPCC08J5/18C08J2323/08C08J2423/06C08J2461/20C08J2471/02C08K9/04C08K2003/265C08K2201/005C08K3/042C08K2003/0806C08K2201/011
Inventor 王冬梅许雍黄国华俞军耀何刚张爱华施祥陆军秦彦王晓云余佳奇
Owner SHANGHAI ZIHUA FILM TECH CO LTD
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