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Waterproof ventilated microporous membrane, its preparing method and use

A technology of waterproof, breathable and microporous membrane, which is applied in the field of waterproof and breathable microporous membrane, which can solve the problems of uneven distribution, large unevenness, and inconsistent size of mesopores, and achieve uniform air permeability and moisture permeability, uniform size and distribution , the effect of high tensile strength

Inactive Publication Date: 2007-05-09
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] No matter whether the above-mentioned invention adopts PTFE or olefin polymer, no matter whether it is to add inorganic filler or not to add inorganic filler, it all adopts the method of stretching to form holes. The biggest defect is that the size of the pores in the obtained microporous products cannot be accurately controlled. The size of some mesopores will be inconsistent and unevenly distributed, which further shows that the air permeability, moisture permeability, water pressure resistance and tensile strength of different parts of the same product are quite different, that is, the inhomogeneity is large
If this kind of microporous membrane with large inhomogeneity is used as waterproof and breathable clothing, it will seriously affect the comfort of clothing.

Method used

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Examples

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Effect test

preparation example Construction

[0033] In the preparation method of the present invention, the nano-scale inorganic powder and / or the non-nano-scale inorganic powder having a nano-scale microporous structure all have a micro-porous skeleton structure. Filling in synthetic resin still maintains this structure, and the added liquid substances (such as plasticizers, lubricants) are absorbed into the micropores by the inorganic powder, and the liquid substances absorbed into the micropores are cleaned out by solvent extraction , and the micropores of the powder are retained to form pores; on the other hand, some liquid substances are miscible in the synthetic resin, and this part of the liquid substances is also washed out by extraction to form pores. This completes the first step of forming a hole.

[0034] The solvent used in the first step of pore forming can be any solvent that can wash out the plasticizer and lubricant through extraction but will not cause adverse effects on the present invention. These so...

Embodiment 1

[0040] Mix the components listed in Table 1 uniformly in a high-speed mixer (Beijing Plastic Machinery Factory, GH-50DY), and then extrude them at 100-170°C in an extruder (Nanjing Keya Industrial Co., Ltd., TP-50). Go out plasticizing, be pressed into the sheet coil material that thickness is 0.8 millimeter with calender (Shanghai Rubber Machine Factory, model is the three-roller calender of XY3F-1120A). Then, it was washed with ethanol at 50° C. for 20 minutes to form a microporous material with a volume porosity of 45% and an average pore diameter of 50 nm. Then, the obtained microporous material is carried out biaxially stretched with a biaxial stretching machine (Guilin Dongchen Film Equipment Co., Ltd.), and the stretching ratio is about 5 times to obtain a microporous membrane with a volumetric porosity of 70 %, the pore diameter is 150nm, and the thickness is 0.1mm. Observing the obtained microporous membrane with an electron microscope (Shimadzu Corporation), it was ...

Embodiment 2

[0042] The components listed in Table 1 were uniformly mixed in a high-speed mixer, then extruded and plasticized in an extruder at 170-220° C., and pressed into a sheet-like coil with a thickness of 0.35 mm by a calender. Then, wash with acetone at 30° C. for 30 minutes to prepare a microporous material with a volume porosity of 30% and an average pore diameter of 30 nm. Then, the obtained microporous material was biaxially stretched with a stretching machine, and the stretching ratio was 10 times to obtain a microporous membrane. The volume porosity of the membrane was 75%, the pore diameter was 150 nm, and the thickness was 0.08 mm. Observing the obtained microporous membrane with an electron microscope, it was found that the size of the micropores was relatively consistent and evenly distributed. The content of plasticizer and lubricant in the obtained microporous membrane was measured by the aforementioned method, the plasticizer was 10 grams, and the lubricant was 11 gra...

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Abstract

The present invention discloses one kind of waterproof and air permeable microporous membrane comprising synthetic resin, inorganic matter powder, plasticizer and lubricant, with the inorganic matter powder being nanometer level inorganic matter powder and / or inorganic matter powder with nanometer level micropores. The waterproof and air permeable microporous membrane has the advantages of even thickness, homogeneous micropore size and distribution and single-way air permeability.

Description

technical field [0001] The invention relates to a waterproof and breathable microporous membrane, a preparation method and application of the membrane. Background technique [0002] Waterproof and breathable membranes have a wide range of uses, such as special clothing (such as windbreakers, diving suits, chemical protective clothing, mountaineering clothing, sports clothing, etc.), sanitary products (such as diapers, incontinence products, bandages, etc.), outdoor tents, protective clothing, etc. hood, and "breathable imitation leather". "Breathable imitation leather" refers to artificial imitation leather with a microporous structure that is breathable and moisture-permeable. [0003] At present, microporous membranes mainly include polytetrafluoroethylene (PTFE) stretched membranes and polyolefin stretched membranes, and the commercialized ones are mainly PTFE stretched membranes, which are widely used to make special clothing, tents and sanitary products; Polyolefin st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08K3/00
Inventor 孙学礼
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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