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A kind of preparation method of biaxially stretched polypropylene non-woven porous fiber membrane

A technology of polypropylene non-woven fabric and two-way stretching, which is applied in the field of film materials, can solve the problems of difficult simultaneous control of pore size and thickness, difficult polypropylene porous film, etc., and achieve controllable porosity and thickness, smooth surface, large size good stability effect

Active Publication Date: 2018-01-30
沃芬非织造材料(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polypropylene non-woven fabrics directly prepared by melt-blown or spun-bonded methods can be used as a porous film, but it is difficult to control the pore size and thickness of this type of porous film at the same time, that is, it is difficult to ensure that the polypropylene porous film is thinner at the same time. , the pore size of the membrane is controlled within a small range

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

[0037] a Polypropylene non-woven fiber membrane preparation

[0038] The prepared polypropylene non-woven fabric fiber web is hot-rolled once at a temperature of 125°C and a pressure of 80MPa with a flat-plate hot rolling mill or a smooth-roll hot rolling mill, and the hot-rolling time is 1s to obtain a uniform and dense polypropylene non-woven fabric. The fiber membrane, wherein the polypropylene non-woven fiber web used is prepared by the preparation process in the literature of its Chinese patent publication number CN104005178A, and the thickness of the polypropylene non-woven fiber membrane is 20 μm.

[0039] b once two-way stretch

[0040] The polypropylene non-woven fabric fiber membrane prepared in step a is preheated by hot air at a temperature of 80°C, and then biaxially stretched at a high temperature of 130°C by a stretching machine. The stretching method is simultaneous longitudinal stretching and transverse stretching. The longitudinal stretch ratio of the propyl...

Embodiment 2

[0049] a Polypropylene non-woven fiber membrane preparation

[0050] The prepared polypropylene non-woven fabric fiber web is hot-rolled once at a temperature of 125°C and a pressure of 80MPa with a flat-plate hot rolling mill or a smooth-roll hot rolling mill, and the hot-rolling time is 1s to obtain a uniform and dense polypropylene non-woven fabric. The polypropylene non-woven fabric fiber web used in the fiber membrane is prepared by the preparation process in the literature of Chinese Patent Publication No. CN101550636A, and the thickness of the polypropylene non-woven fiber membrane is 20 μm.

[0051] b once two-way stretch

[0052] The polypropylene non-woven fabric fiber membrane prepared in step a is preheated by hot air at a temperature of 80°C, and then biaxially stretched at a high temperature of 130°C by a stretching machine. The stretching method is simultaneous longitudinal stretching and transverse stretching. The longitudinal stretch ratio of the propylene no...

Embodiment 3

[0061] a Polypropylene non-woven fiber membrane preparation

[0062] The prepared polypropylene non-woven fabric fiber web is hot-rolled once at a temperature of 150°C and a pressure of 5 MPa with a flat-plate hot rolling mill or a smooth-roll hot rolling mill, and the hot-rolling time is 10s to obtain a uniform and dense polypropylene non-woven fabric. The fiber membrane, wherein the used polypropylene non-woven fiber web is prepared by the preparation process in the literature of Chinese Patent Publication No. CN104005178A, and the thickness of the polypropylene non-woven fiber membrane is 1000 μm.

[0063] b once two-way stretch

[0064] The polypropylene non-woven fiber membrane prepared in step a is preheated by hot air at a temperature of 80°C, and then biaxially stretched at a high temperature of 130°C by a stretching machine. The stretching method is longitudinal stretching and transverse stretching step by step or Longitudinal stretching and transverse stretching are...

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Abstract

The invention relates to a preparing method of a two-way stretch polypropylene non-woven fabric porous fiber membrane, and belongs to the technical field of membrane materials. A polypropylene melt-blowing or spun-bonded non-woven fabric fiber net is subject to repeated hot rolling and repeated two-way stretching, and finally, through heat shaping, the polypropylene non-woven fabric porous fiber membrane is made. The method is suitable for polypropylene melt-blowing or spun-bonded non-woven porous fiber membranes of different marks, and the prepared polypropylene non-woven fabric porous fiber membrane has the beneficial effects of being controllable in pore diameter, porosity and thickness, bright and smooth in surface and the like and can be widely used for the fields of manufacturing of battery diaphragms, filter materials, packaging materials, agricultural protection materials and the like.

Description

technical field [0001] The invention relates to a method for preparing a polypropylene nonwoven porous fiber membrane, which belongs to the technical field of film materials. Background technique [0002] Polypropylene porous membrane can be widely used in fields such as battery separator, filtration and separation. In the prior art, the polypropylene porous film can be prepared by dry method and wet method, and the dry method can be subdivided into dry uniaxial stretching process and dry biaxial stretching process. The dry preparation process is to melt and extrude polypropylene, stretch at high temperature, cool and stretch to form slit-like micropores, and then heat-set to obtain a porous film. This process requires high precision control of the process, and it is difficult to control the porosity of the film. . Celgard of the United States owns a series of patents on the dry uniaxial stretching process, and the Institute of Chemistry of the Chinese Academy of Sciences ...

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): B29C69/02B29C55/12B29C43/24
CPCB29C43/24B29C55/12B29C69/02
Inventor 王罗新熊思维罗丹陈少华许静殷先泽王桦
Owner 沃芬非织造材料(浙江)有限公司