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Waterproof and moisture permeable polyethylene film and preparation method thereof

A waterproof and moisture-permeable membrane and polyethylene technology, applied in the field of waterproof and moisture-permeable membrane materials, can solve the problems of pore size stability and poor waterproof performance, and achieve excellent hydrostatic pressure resistance, low production cost, and good moisture permeability. Effect

Inactive Publication Date: 2019-03-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the final film product has poor performance in terms of pore size stability and waterproof performance, so it can only be used in sanitary materials and baby diapers

Method used

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  • Waterproof and moisture permeable polyethylene film and preparation method thereof
  • Waterproof and moisture permeable polyethylene film and preparation method thereof

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preparation example Construction

[0023] The invention provides a method for preparing a polyethylene waterproof and moisture-permeable membrane, comprising the following steps:

[0024] S1. The polyethylene raw material is mixed with white oil, melted and extruded, and cast and cooled to obtain a cast oil film; the polyethylene raw material has a weight average molecular weight of 600,000 to 800,000. The mass ratio of oil is 1: (1.5~2.5);

[0025] S2. After heating the cast oil film to 90-110°C, perform asynchronous biaxial stretching, and then undergo heat setting and cooling to obtain a biaxially stretched oil film; the longitudinal ratio of the biaxial stretching is 3-5, and the transverse Rabbi is 5~8;

[0026] S3. Ultrasonic extraction is performed on the biaxially stretched oil film. The extraction agent used in the ultrasonic extraction is n-hexane or methylene chloride, and then the extracted film is dried to obtain a polyethylene waterproof and moisture-permeable film.

[0027] The polyethylene wat...

Embodiment 1

[0041] (1) Take 1.5kg polyethylene raw material (weight average molecular weight is 600,000, density is 0.96g / cm 3 ), mixed evenly with solvent white oil 68# in a mass ratio of 1:2, added 0.5% BHT type antioxidant, and then put the obtained polyethylene solution into a preheating kettle with a temperature of 100°C for preheating, preheating The time is 1h;

[0042] (2) Melt and extrude the preheated polyethylene solution through a twin-screw extruder at 235 ° C and a screw speed of 60 rpm, and then rapidly cool it through a casting roll at 20 ° C and a roll speed of 5 rpm to obtain a stream extended oil film;

[0043] (3) Fix the casting oil film obtained above on the fixture in the biaxial stretching device, then push the fixture to the preheating furnace for preheating, the preheating temperature is 68°C, then transport the fixture to the heating furnace, and the heating time 2min, the temperature is 100°C;

[0044] (4) Carry out the asynchronous two-way stretching of ver...

Embodiment 2

[0051] (1) Take 1.5kg polyethylene raw material (weight average molecular weight is 800,000, density is 0.96g / cm 3 ), mixed evenly with solvent white oil 70# at a ratio of 1:2, added 0.5% BHT type antioxidant, and then put the obtained polyethylene solution into a preheating kettle with a temperature of 100°C for preheating, and the preheating time for 1h;

[0052] (2) Melt and extrude the preheated polyethylene solution through a twin-screw extruder at 235 ° C and a screw speed of 60 rpm, and then rapidly cool it through a casting roll at 20 ° C and a roll speed of 5 rpm to obtain a stream extended oil film;

[0053] (3) Fix the casting oil film obtained above on the fixture in the biaxial stretching device, then push the fixture to the preheating furnace for preheating, the preheating temperature is 68°C, then transport the fixture to the heating furnace, and the heating time 2min, the temperature is 100°C;

[0054] (4) Carry out the asynchronous two-way stretching of ver...

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Abstract

The invention provides a waterproof and moisture permeable polyethylene film and a preparation method thereof. The method comprises the following steps: S1, mixing a polyethylene raw material and white oil, performing melt extrusion, casting and cooling to obtain a cast oil film, wherein the weight-average molecular weight of the polyethylene raw material is 600000-800000, and a mass ratio of thepolyethylene raw material to the white oil is 1:(1.5-2.5); S2, heating the cast oil film to 90-110 DEG C, performing asynchronous bidirectional stretching, and performing heat setting and cooling so as to obtain a bidirectional stretched oil film, wherein a longitudinal stretching ratio of bidirectional stretching is 3-5, and a transverse stretching ratio of bidirectional stretching is 5-8; and S3, performing ultrasonic extraction on the bidirectional stretched oil film, wherein the extraction agent used for ultrasonic extraction is normal hexane or dichloromethane; and drying the extracted film, thereby obtaining the waterproof and moisture permeable polyethylene film. The waterproof and moisture permeable polyethylene film disclosed by the invention has excellent waterproof property andexcellent moisture permeability, and can be applied to the fields of medical health work, protective clothing, building safety protecting and the like.

Description

technical field [0001] The invention relates to the technical field of waterproof and moisture-permeable membrane materials, and more specifically relates to a polyethylene waterproof and moisture-permeable membrane and a preparation method thereof. Background technique [0002] As a new type of waterproof material, the waterproof and moisture-permeable membrane can prevent water droplets from penetrating while allowing water vapor with a smaller diameter to pass through, so that the waterproof and moisture-permeable membrane has "breathable" characteristics, so it is widely used in Medical and health, building protection and outdoor protective clothing and other fields. [0003] At present, waterproof and moisture-permeable membranes are mainly divided into polytetrafluoroethylene (PTFE) microporous membranes, non-porous hydrophilic polyurethane films and polyethylene (PE) microporous membranes. PTFE microporous membrane is generally made of PTFE resin through paste extrus...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L23/06
CPCC08J9/28C08J2323/06
Inventor 李良彬万彩霞孟令蒲王道亮陈晓伟
Owner UNIV OF SCI & TECH OF CHINA
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