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Method for preparing polytetrafluoroethylene waterproof moisture permeating fabric

A polytetrafluoroethylene and polytetrafluoroethylene layer technology, which is applied in the field of preparation of waterproof and moisture-permeable fabrics, can solve the problems of dense polyurethane film or low porosity, difficult to completely volatilize solvent, and poor moisture permeability, etc. It is easy to form aurora, increase roughness, and enhance the effect of moisture permeability

Inactive Publication Date: 2010-06-09
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method has the following defects: (1) most of the polyurethane films formed after the volatilization of solvents such as dimethylformamide are dense or have low porosity, resulting in poor moisture permeability of the overall material; (2) after drying, It is difficult for the solvent to volatilize completely, and the polyurethane still has a certain viscosity, which is easy to adhere after the fabric is rolled; (3) the surface of the polyurethane is easy to form aurora

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a polytetrafluoroethylene waterproof and moisture-permeable fabric, the preparation steps of which are as follows:

[0033] (1) Apply solvent-based polyurethane dot glue to the fabric by the slurry dot method, and heat-press the biaxially stretched polytetrafluoroethylene microporous film at 120° C. for 2 minutes with a pore diameter of 0.2 microns and a thickness of 40 microns to prepare a polytetrafluoroethylene microporous film. Tetrafluoroethylene laminated fabric;

[0034] (2) Add dimethylformamide solvent in the feed tank, start the agitator to stir at a high speed, and the stirrer rotating speed is 500 rpm, so that the solvent generates a vortex in the feed tank, and gradually add polyurethane granules, the solid of the polyurethane granules The content is 20%, so that it is suspended in the solvent vortex. After the polyurethane particles are dissolved, add a diluent and dilute to 5% with methyl ethyl ketone; add 600-mesh industrial hemp c...

Embodiment 2

[0038] A method for preparing a polytetrafluoroethylene waterproof and moisture-permeable fabric, the preparation steps of which are as follows:

[0039] (1) Use the powder point method to apply hot-melt polyester dot glue to the fabric, and heat press it at 160°C for 2 minutes with a biaxially stretched polytetrafluoroethylene microporous film with a pore size of 5 microns and a thickness of 80 microns. Preparation of polytetrafluoroethylene laminated fabric;

[0040] (2) Add dimethylacetamide solvent in the feed tank, start the agitator to stir at a high speed, and the stirrer rotating speed is 1000 rpm, so that the solvent generates a vortex in the feed tank, gradually add polyurethane granules, the solids of the polyurethane granules The content is 60%, so that it is suspended in the solvent vortex. After the polyurethane particles are dissolved, add a diluent and dilute to 20% with ethyl acetate; add 300-mesh pine powder in a weight ratio of 15%, and continue to stir at a...

Embodiment 3

[0044] A preparation method for preparing polytetrafluoroethylene waterproof and moisture-permeable fabric, the preparation steps are as follows:

[0045] (1) Use the double-point method to apply hot-melt polyamide and ethylene-ethyl acetate dot glue to the fabric, and use a biaxially stretched polytetrafluoroethylene microporous film with a pore size of 4 microns and a thickness of 35 microns at 150 ° C. Under hot pressing for 2 minutes, the polytetrafluoroethylene laminated fabric is prepared;

[0046] (2) Add dimethyl sulfoxide solvent in the feed tank, start the agitator to stir at a high speed, and the stirrer rotating speed is 800 rpm, so that the solvent generates a vortex in the feed tank, and gradually add polyurethane granules, the solid of the polyurethane granules The content is 40%, so that it is suspended in the solvent vortex. After the polyurethane particles are dissolved, add a diluent and dilute to 30% with methyl ethyl ketone; add 500 mesh cork powder at a w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The present invention is preparation process of poromeric teflon fabric. Small amount of natural plant powder is added into polyurethane coating solution and the powder will retain inside the polyurethane film after the solvent is volatilized. The powder can absorb moisture to expand to reach the waterproof performance of the material, shrink in dry condition to increase the porosity of the polyurethane film and to increase the water vapor permeability, raise the harsh feeling of polyurethane film and reduce stickness. The poromeric teflon fabric may be applied widely in making various kinds of poromeric clothes.

Description

technical field [0001] The invention relates to a preparation method of a waterproof and moisture-permeable fabric, in particular to a preparation method for enhancing the moisture permeability of a polytetrafluoroethylene waterproof and moisture-permeable fabric. Background technique [0002] At present, waterproof and moisture-permeable functional fabrics include high-density fabrics, coated fabrics, and laminated fabrics. It also has multiple functions such as virus isolation and protection, so it occupies an important position in functional fabrics. The traditional processing method in our country is to first process the microporous PTFE film through biaxial stretching, and then laminate it with the fabric through point-shaped adhesives, and finally apply a moisture-permeable polyurethane solution on one side of the film, and dry it. Finally, a waterproof and moisture-permeable laminated fabric is obtained, wherein after the polyurethane solution is dried, solvents such...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/18
Inventor 郝新敏张建春郭玉海梁高勇王岩
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME