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
  • Application Information

AI Technical Summary

Problems solved by technology

However, the final film product has poor performance in terms of pore size stability an

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

Examples

Experimental program
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Example Embodiment

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

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

[0025] S2. After heating the casting oil film to 90-110°C, perform asynchronous biaxial stretching, and then heat setting and cooling to obtain the biaxial stretching oil film; the longitudinal extension ratio of the biaxial stretching is 3 to 5, The rabbi is 5~8;

[0026] S3. Perform ultrasonic extraction on the biaxially oriented oil film, and the extractant used in the ultrasonic extraction is n-hexane or dichloromethane, and then dry the extracted film to obtain a polyethylene waterproof and moistur...

Example Embodiment

[0040] Example 1

[0041] (1) Take 1.5kg polyethylene raw material (weight average molecular weight is 600,000, density is 0.96g / cm 3 ), mixed with solvent white oil 68# in a mass ratio of 1:2, add 0.5% BHT type antioxidant, and then put the obtained polyethylene solution into a preheating kettle with a temperature of 100℃ for preheating and preheating 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 60rpm, and then pass it through a casting roll at 20°C and a roll speed of 5rpm for rapid cooling to obtain a flow 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℃, and then transport the fixture to the heating furnace, heating time 2min, temperature is 100℃;

[0044] (4) The heated casting oil film is stretched longitudinally and then transv...

Example Embodiment

[0050] Example 2

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

[0052] (2) Melt and extrude the preheated polyethylene solution through a twin-screw extruder at 235°C and a screw speed of 60rpm, and then pass it through a casting roll at 20°C and a roll speed of 5rpm for rapid cooling to obtain a flow 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℃, and then transport the fixture to the heating furnace, heating time 2min, temperature is 100℃;

[0054] (4) The heated casting oil film is stretched longitudinally and then transversely by ...

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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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