Waterproof and moisture-permeable membrane, its preparation method and application

A technology of waterproof and moisture-permeable membrane and water repellent, which is used in textiles and papermaking, liquid repellent fibers, plant fibers, etc. It can solve the problems of poor durability and poor bonding force of hydrophobic coatings, and achieve high water pressure resistance and permeability. The effect of wet flux, small pore size, and strong structure adjustability

Active Publication Date: 2022-06-24
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber membrane prepared by the current post-finishing coating method is due to the physical combination between the waterproof agent coating and the fiber membrane, the bonding force between the waterproof agent coating and the fiber membrane is poor, and the durability of the hydrophobic coating is poor. , it is difficult to meet the practical needs

Method used

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  • Waterproof and moisture-permeable membrane, its preparation method and application
  • Waterproof and moisture-permeable membrane, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The present embodiment prepares a waterproof and moisture-permeable membrane, and the specific steps are:

[0041] (1) Preparation of electrospinning fiber membrane: The blocked solvent-based isocyanate (deblocking temperature is 80°C) and polyacrylonitrile (relative molecular mass 90000) are dissolved in the solvent N,N- A spinning solution with a mass fraction of 8 wt% was prepared in dimethylformamide, and a uniform and stable solution was obtained by mechanical stirring. The polyacrylonitrile composite fiber membrane was received on the glossy paper by electrospinning technology. The spinning voltage was 30kV, and the receiving distance is 20 cm, the perfusion rate is 3 mL / h, the temperature is 25 °C, and the relative humidity is 50%.

[0042] (2) Take 2 g of stearic acid solution with a solid content of 25%, prepare a 2 wt% stearic acid solution, fully immerse the polyacrylonitrile composite fiber film in the stearic acid solution at room temperature, and then unde...

Embodiment 2

[0047] The present embodiment prepares a waterproof and moisture-permeable membrane, and the specific steps are:

[0048] (1) Preparation of electrospinning fiber membrane: Dissolve blocked solvent-based isocyanate (deblocking temperature of 100° C.) and cellulose acetate (acetyl 39.8 wt%, hydroxyl 3.5 wt%) in a mass ratio of 2:1 A spinning solution with a mass fraction of 18 wt% was prepared in the solvent dimethyl sulfoxide and acetone, and a uniform and stable solution was obtained by mechanical stirring. The cellulose acetate composite fiber membrane was received on the glossy paper by electrospinning technology, and the spinning voltage was 30kV, the receiving distance is 20cm, the perfusion speed is 3mL / h, the temperature is 23°C, and the relative humidity is 60%.

[0049] (2) Take 1 g of a hydroxyl-terminated polysiloxane solution with a solid content of 30%, prepare a 2wt% hydroxyl-terminated polysiloxane solution, and fully immerse the cellulose acetate composite fibe...

Embodiment 3

[0052] The present embodiment prepares a waterproof and moisture-permeable membrane, and the specific steps are:

[0053] (1) Preparation of electrospinning fiber membrane: Dissolve blocked solvent-based isocyanate (deblocking temperature of 90° C.) and nylon 6 (weight average molecular weight 50000) in solvent formic acid at a mass ratio of 3:4 to prepare mass The spinning solution with a fraction of 10 wt% was mechanically stirred to obtain a uniform and stable solution. The nylon 6 composite fiber membrane was received on the glossy paper by electrospinning technology. The spinning voltage was 40 kV, the receiving distance was 20 cm, and the perfusion speed was 2 mL / h. , the temperature is 20°C, and the relative humidity is 60%.

[0054] (2) Take 2g of amino-terminated silicone oil solution with a solid content of 25%, prepare a 2wt% amino-terminated silicone oil solution, fully immerse the nylon 6 composite fiber film in the amino-terminated silicone oil solution at room t...

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Abstract

The invention provides a waterproof and moisture-permeable membrane, a preparation method and application thereof. The waterproof and moisture-permeable membrane of the present invention uses the fiber membrane as the base material and has the advantages of a wide range of spinnable raw materials, a small pore size of the fiber membrane, a high porosity, and strong structural adjustability. Compared with the waterproof and moisture-permeable fabric, it can obtain more High water pressure resistance and moisture permeability flux. The blocked solvent-based isocyanate cross-linking agent is used. After the cross-linking agent is unblocked, it reacts with the active groups in the waterproofing agent, stably covering the hydrophobic chain segment on the fiber surface, and improving the durability of the waterproofing agent coating. After 50 wear cycles, the contact angle does not change significantly, and the water pressure resistance and moisture permeability remain basically unchanged after 30 washes.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a waterproof and moisture-permeable membrane and a preparation method and application thereof. Background technique [0002] The waterproof and moisture-permeable membrane can not only prevent the penetration of external rain and snow, but also effectively discharge the sweat vapor generated by the human body. It has broad application prospects in the field of outdoor sportswear and protective clothing. [0003] In the related art, waterproof and moisture-permeable membranes mainly include two categories: hydrophobic microporous membranes and hydrophilic nonporous membranes. Due to its porous structure, hydrophobic microporous membranes have better moisture permeability and better comfort, and have received extensive attention. Electrospinning fiber membrane has the advantages of small pore size and high porosity, and is one of the effective methods for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/188D06M15/643D04H1/4382D04H1/728D06M101/28D06M101/08D06M101/34
CPCD06M13/188D06M15/643D06M15/6436D04H1/728D04H1/4382D10B2501/04D10B2401/021D06M2101/28D06M2200/12D06M2101/08D06M2101/34
Inventor 赵景王先锋陈丽霞闫建华于晖
Owner WUYI UNIV
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