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Microporous membrane modification method

A microporous membrane and modification technology, which is applied in the field of microporous membrane, can solve the problems of high processing cost, loss of moisture permeability, and difficulty in industrialization, and achieve the effects of greatly reducing water pressure resistance, low cost, and simple method

Active Publication Date: 2014-04-23
NANJING FIBERGLASS RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unique performance of the microporous membrane, its application field is too narrow, and in order to improve or broaden its application range, it is necessary to carry out appropriate modification treatment on the basis of ensuring its characteristic performance to meet its other required performance requirements.
[0003] Invention patent US5354587 discloses a modification method of prepolymer crosslinking. Several prepolymers and crosslinking agents are coated on the microporous membrane, and then crosslinked on the microporous membrane through the reaction box. Combined effect, the treatment agent is fixed on the microporous membrane through the network structure to achieve the purpose of modification, this method is complicated in process and expensive in processing cost
[0004] Invention patent CN200910098021 discloses a modification method for microporous membrane coating. The treatment liquid is made into a viscous solution and coated on the microporous membrane, the solvent is heated and dried, and the treatment agent is adsorbed on the surface of the membrane to achieve the modification effect. The method is simple in process and low in cost. Although the water pressure resistance has been improved after washing, the micropores are seriously blocked after modification, and the loss of moisture permeability is very obvious.
[0005] Invention patent CN200410017158 discloses a modification method of blending processing. The treatment agent is blended with the microporous membrane substrate raw materials, and then processed together to form a film. The treatment agent is embedded in the microporous network to achieve the purpose of modification, but this The method is more difficult to industrialize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Make 100ml (105.1g) ethyl dimethacrylate, 50ml (43.3g) toluene, 100ml (79g) absolute ethanol, 20ml (16.2g) butanone into a mixed solvent, add 10g polyether polyurethane, 0.1g containing The fluorosurfactant is stirred to form the treatment solution; the temperature of the treatment solution is lowered to 5°C, and one of the surfaces of the polytetrafluoroethylene microporous membrane passes through the treatment solution at a speed of 10m / min under the action of the moving double-track clamp, and is stretched into the ladder by tension. In a type oven, first heat at 50°C for 2 minutes, then heat at 80°C for 2 minutes, and finally heat at 100°C for 3 minutes to dry the solvent to obtain a modified microporous membrane, which is wound up. The performance comparison of microporous membranes before and after modification is shown in the table below, and the water pressure resistance of modified PTFE microporous membranes has been significantly improved after washing.

[002...

Embodiment 2

[0030] 50ml (52.5g) of ethyl dimethacrylate, 20ml (17.32g) of toluene, 20ml (15.8g) of absolute ethanol, 10ml (8.1g) of methyl ethyl ketone are made into a mixed solvent, and 10g of polyether polyurethane is added. Stir 0.1g of fluorine-containing surfactant to form a treatment solution; raise the temperature of the treatment solution to 50°C, one of the surfaces of the polypropylene microporous membrane passes through the treatment solution at a speed of 30m / min under the action of a moving double-track clamp, and stretches into the treatment solution by tension. In a stepped oven, heat at 40°C for 2 minutes, 60°C for 1 minute, and 100°C for 3 minutes to dry the solvent to obtain a modified microporous membrane, which is wound up. The performance comparison of the microporous membrane before and after modification is shown in the table below, and the water pressure resistance of the modified polypropylene microporous membrane has been significantly improved after washing.

[...

Embodiment 3

[0033] Mix 220ml of methyl dimethacrylate, 100ml (79g) of absolute ethanol, and 100ml (81g) of butanone into a mixed solvent, add 5g of polyether polyurethane, 5g of PTFE emulsion, and 1g of fluorine-containing surfactant and stir to form a treatment liquid; heat up the treatment liquid to 100°C, one of the surfaces of the polyimide microporous membrane passes through the processing liquid at a speed of 50m / min under the action of the moving double-track clamp, and enters the ladder oven through tension stretching, first at 100°C Heating for 10 minutes, heating at 120°C for 10 minutes, heating at 150°C for 10 minutes, drying the solvent to obtain a modified microporous membrane, and winding. The performance comparison of the microporous membrane before and after modification is shown in the table below, and the water pressure resistance of the modified polyimide microporous membrane has been significantly improved after washing.

[0034]

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Abstract

The invention relates to a microporous membrane modification method which includes the following steps of: (1) conducting dipping treatment to one of the surfaces of the a microporous membrane through conditioning fluid; and (2) drying the microporous membrane treated in step (1) to obtain a modified microporous membrane. The microporous membrane modification method is simple and low in cost, and the moisture permeability of the microporous membrane modified through the method barely reduces before or after the microporous membrane is rinsed. The microporous membrane modification method overcomes the disadvantage that the hydrostatic pressure resistance of the microporous membrane is greatly reduced before or after the microporous membrane is washed. The hydrostatic pressure resistance of the microporous membrane modified through the method almost remains unchanged before or after the microporous membrane is washed.

Description

technical field [0001] The invention relates to a microporous membrane, which specifically belongs to the field of modification of the microporous membrane, and mainly provides the performance characteristics required by the microporous membrane through post-treatment modification of the microporous membrane, so as to broaden the application of the microporous membrane. Background technique [0002] The microporous membrane endows the substrate with unique properties due to its special microporous structure. For example, the polyolefin microporous membrane can block the positive and negative electrodes, but it can allow the ion flow to pass through quickly; such as the polytetrafluoroethylene microporous membrane can prevent raindrops. Pass through, but allow water vapor to evaporate smoothly. However, due to the unique properties of the microporous membrane, its application field is too narrow, and in order to improve or broaden its application range, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/00C08L27/18C08L27/16C08L23/12C08L23/06C08L79/08C08L81/06
Inventor 周群郭晓蓓陈阳费传军宋尚军白耀宗
Owner NANJING FIBERGLASS RES & DESIGN INST CO LTD