Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for preparing hygroscopic vapor transmission polyurethane membrane

A technology for a polyurethane film and a production method, applied in the direction of coating and the like, can solve the problems of expensive solvent, difficult demolding and use, complicated processing technology of microporous film, etc., and achieves easy industrialization promotion, simple and convenient processing route, and good moisture absorption. The effect of the vapor permeation effect

Inactive Publication Date: 2011-06-01
WUHAN TEXTILE UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the complex processing technology of microporous membranes and the high price of solvents, it is easy to cause environmental pollution, and the specific surface area increases after the formation of micropores, which is easy to be stained by dust absorption and adsorption of detergent, or to block the micropores and reduce the air permeability. The non-microporous polymer film of the hydrophilic group block polyurethane film has good air permeability, but due to the complex synthesis process, poor mechanical properties of the material, and great surface adhesion, it is not easy to release and use.

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
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 The processing steps of a moisture-absorbing and vapor-permeable polyurethane film blended with down ultrafine powder and polyurethane are as follows:

[0019] A Add 4.25 grams of ammonium bicarbonate to 11 ml of water, raise the temperature to 40°C in a closed container, then add 12.75 grams of down ultra-fine powder, the average particle size of the powder is 2 microns, cool down to room temperature while stirring, and then vacuumize Until the feather powder is dry.

[0020] B. Add the dry modified down ultrafine powder into 210 ml of tetrahydrofuran solvent, and disperse it by ultrasonic wave for 10 minutes, so that the down ultrafine powder is evenly mixed in the tetrahydrofuran solvent.

[0021] C Mix 250 grams of polyurethane solution with a solid content of 40% and 700 grams of N,N-dimethylformamide solvent, stir until the mixture is uniform, and configure a solution with a polyurethane content of 10.5%.

[0022] D Add the modified down superfine po...

Embodiment 2

[0024] Embodiment 2 The processing steps of a moisture-absorbing and vapor-permeable polyurethane film blended with wool ultrafine powder and polyurethane are as follows:

[0025] A Add 2.14 grams of ammonium carbonate to 6 milliliters of water, heat up to 40°C in a closed container, then add 4.28 grams of wool superfine powder, the average particle size of the powder is 2 microns, cool down to room temperature while stirring, and then vacuum until The wool powder is dried.

[0026] B. Add the dry modified wool superfine powder into 21 ml of acetone solvent, and disperse it by ultrasonic wave for 30 minutes, so that the wool superfine powder is evenly mixed in the acetone solvent.

[0027] C Mix 50 grams of N,N-dimethylformamide solution with a solid content of 30% polyurethane and 25 grams of N,N-dimethylformamide solvent, stir until uniformly mixed, and configure the polyurethane content to be 20% The solution.

[0028] D Add the modified wool superfine powder dispersion to ...

Embodiment 3

[0030] Example 3 The processing steps of a moisture-absorbing and vapor-permeable polyurethane film blended with silk ultrafine powder and polyurethane are as follows:

[0031] A Add 10 grams of sodium bicarbonate to 25 ml of water, heat up to 40°C in a closed container, then add 10 grams of silk superfine powder, the average particle size of the powder is 5 microns, cool down to room temperature while stirring, and then vacuumize until the silk powder is dry.

[0032] B Add the dried modified silk superfine powder into 60 ml of ethanol or ethylene glycol solvent, and disperse it by ultrasonic wave for 30 minutes, so that the silk superfine powder is evenly mixed in the ethanol or ethylene glycol solvent.

[0033] C. Add 57 grams of polyurethane into 323 grams of dimethylformamide solvent, stir evenly until the polyurethane is completely dissolved, and configure a solution with a polyurethane content of 15%.

[0034] D Add the modified silk superfine powder dispersion to the ...

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
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of polyurethane material processing, in particular to a production method of a moisture-absorbing and breathable polyurethane film. The production process of the moisture-absorbing and breathable polyurethane film includes the following steps: the superfine powder of natural polymer fiber material is modified and dispersed; polyurethane solution is prepared; the products are mixed to cast the film. The polyurethane film processed by the method not only includes natural polymer fiber material superfine powder, but also includes micro-pores which are around the superfine powder particles, go through the interface of the polyurethane film and for water vapor to go through; in the polyurethane film, the superfine powder can absorb and release the moisture by the micro-pores around, so that the polyurethane film has excellent moisture absorbing and breathable effect; meanwhile, the process of the technical proposal has simple and convenient processing route, and is easy for industrialized promotion.

Description

technical field [0001] The invention belongs to the field of polyurethane material processing, and in particular relates to a production method of a moisture-absorbing and vapor-permeable polyurethane film. technical background [0002] Polyurethane (PU) is a polymer containing carbamate (-NHCOO-) groups, usually composed of isocyanate (containing -NCO groups) or its adducts and active hydrogen (mainly active hydrogen in hydroxyl) Polypolyol reacted. Due to its high strength, abrasion resistance, flex resistance, low temperature resistance, oil resistance and excellent chemical resistance, polyurethane can be made into foam plastics, elastomers, coatings, adhesives, fibers, synthetic leather and paving Materials and other products are widely used in the fields of electromechanical, shipbuilding, civil engineering, light industry and textile, and occupy a very important proportion in the material industry. Due to the poor moisture absorption and vapor permeability of polyur...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/10B29C41/16C08J5/18C08L75/04C08K13/02B29C41/36
Inventor 徐卫林崔卫钢李文斌郭维祺
Owner WUHAN TEXTILE UNIV