Wet-method production process for micro-porous membrane

A technology of microporous film and production process, which is applied in the field of production process of wet microporous film, which can solve the problems of poor low temperature performance, large wet resistance, poor water-splashing processability, etc., and achieve good surface strength and small wet resistance Effect

Inactive Publication Date: 2019-08-30
JIAXING DEYONG TEXTILES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its melting point is low (about 120°C), its wet resistance is large, its low-temperature performance is not good, and its water-splashing processability after compounding is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The production process of a kind of wet-process microporous membrane involved in this embodiment comprises the following steps:

[0025] (1) According to the PU resin of 100 mass parts, the hydrophobic powder of 5 mass parts, the bridging agent of 1 mass part, the hygroscopic agent of 2 mass parts, the DMF of 100 mass parts evenly mixes and prepares mixed solution, in The viscosity of the mixed solution at 30°C is 2500 cps. The hydrophobic powder used was silica with a particle size of 2 μm. The PU resin used is specifically polyether polyurethane resin. The bridging agent is also called curing agent, which is a closed water-based curing agent, and its main component is blocked polyisocyanate. The hygroscopic agent used was polyethylene glycol. DMF is N,N-dimethylformamide, miscible with water and most organic solvents, a colorless liquid with a faint special odor, stable in nature, with a melting point of -61°C and a boiling point of 152.8°C. Mainly used in industr...

Embodiment 2

[0034]The production process of a kind of wet-process microporous membrane involved in this embodiment comprises the following steps:

[0035] (1) According to the PU resin of 100 mass parts, the hydrophobic powder of 9 mass parts, the bridging agent of 1.5 mass parts, the hygroscopic agent of 3 mass parts, the DMF of 110 mass parts evenly mix and prepare mixed solution, in The viscosity of the mixed solution at 30°C is 2800 cps. The hydrophobic powder used was silica with a particle size of 2 μm.

[0036] The preparation of the mixed solution is as follows: mix and stir 9 parts by mass of hydrophobic powder and 110 parts by mass of DMF, filter through a 120-mesh filter, then add 67 parts by mass of PU resin to mix and stir, and filter with 80-mesh Net filtration, then add the remaining PU resin, 1.5 parts by mass of bridging agent, and 3 parts by mass of hygroscopic agent, stir and filter with an 80-mesh filter, and degas under a closed vacuum environment with a reduced pres...

Embodiment 3

[0043] The production process of a kind of wet-process microporous membrane involved in this embodiment comprises the following steps:

[0044] (1) According to the PU resin of 100 parts by mass, the hydrophobic powder of 10 parts by mass, the bridging agent of 2 parts by mass, the hygroscopic agent of 5 parts by mass, the DMF of 120 parts by mass uniformly mix and prepare mixed solution, in The viscosity of the mixed solution at 30°C is 3000 cps.

[0045] The preparation of the mixed solution is as follows: mix and stir 10 parts by mass of hydrophobic powder and 120 parts by mass of DMF, filter with a 120-mesh filter, then add 80 parts by mass of PU resin to mix and stir, and filter with an 80-mesh filter Net filtration, then add the remaining PU resin, 2 parts by mass of bridging agent, 2-5 parts by mass of hygroscopic agent, stir and filter with 80 mesh filter, and carry out under the condition of a closed vacuum environment with a reduced pressure of 0.08Mpa Degassing for...

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Abstract

The invention discloses a wet-method production process for a micro-porous membrane. The process comprises the steps of firstly, preparing a mixed solution of a DMF system according to a set ratio andset operating steps, coating PP or PET release paper with the mixed solution, dipping the coated PP or PET release paper in a DMF aqueous solution and clear water, and separating out silicon dioxidefrom a coating through a gel state of PU-DMF-H2O; and carrying out pressurizing through a pressurizing roller, replacing DMF remaining in the coating in a replacement tank, and carrying out three-stepdrying to completely evaporate the DMF in the coating. The micro-porous membrane prepared by the process has the air permeability (JIS standard cc) of 0.205 to 0.226 and the moisture permeability B-1of 21,423 g / m<2> / 24h to 32,769 g / m<2> / 24h. The water pressure resistance (JIS standard) is higher than 15,000mm and can meet the requirements of a majority of functional clothing on waterproofing andmoisture permeability. The micro-porous membrane has a micro-porous structure with uniform diameter and low wet impedance. The micro-porous membrane has no swelling property and good film surface strength. A film mentioned in the invention is made from a polyurethane material, and the material is naturally decomposed in 3 to 5 years due to action of humidity and microbes when the material is buried in soil.

Description

technical field [0001] The invention relates to the technical field of microporous membranes, in particular to a production process of wet microporous membranes. Background technique [0002] In recent years, with the vigorous development of outdoor sports such as mountaineering, skiing, and sailing, and the special needs of some powerful departments (such as the army, police, etc.) for clothing fabrics, a variety of functional waterproof and moisture-permeable films have been developed and applied to textiles. Composite to produce clothing fabrics with waterproof and moisture-permeable functions, which are applied to functional clothing. Polyurethane waterproof and moisture-permeable film is one of the representative products. TPU waterproof and moisture-permeable film is a homogeneous and non-porous film. It uses polyurethane elastomer TPU with hydrophilic groups as the main material, and uses salivation or blow molding process processing. The film has high water pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08L75/08C08L75/04
CPCC08J5/18C08J9/28C08J2375/04C08J2375/08
Inventor 李雪峰
Owner JIAXING DEYONG TEXTILES CO LTD
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