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Process for preparing hygroscopic vapor transmission polyurethane membrane

A technology of polyurethane film and production method, which is applied in the direction of coating, etc., can solve the problems of expensive solvent, complicated microporous film processing technology, difficult demoulding and use, etc., and achieves easy industrialization promotion, good moisture absorption and breathable effect, and processing route Simple and convenient effect

Inactive Publication Date: 2008-09-24
WUHAN TEXTILE UNIV
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  • 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

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 A moisture-absorbing and breathable polyurethane film that uses ammonium bicarbonate as a modifier for feather ultrafine powder and polyurethane blending

[0019] The processing steps are as follows:

[0020] 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.

[0021] B. Add the dry modified down superfine powder into 210 ml of tetracyanofuran solvent, and disperse it by ultrasonic wave for 10 minutes, so that the down superfine powder is uniformly mixed in the tetracyanofuran solvent.

[0022] 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....

Embodiment 2

[0025] Example 2 A moisture-absorbing and breathable polyurethane film made by blending wool ultrafine powder and polyurethane with ammonium carbonate as a modifier

[0026] The processing steps are as follows:

[0027] 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.

[0028]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.

[0029] 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.

[0030] D Add the mod...

Embodiment 3

[0032] Example 3 A moisture-absorbing and breathable polyurethane film that uses sodium bicarbonate as a modifier for silk ultrafine powder and polyurethane blending

[0033] The processing steps are as follows:

[0034] 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.

[0035] 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.

[0036] 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%.

[0037] D Add the modi...

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PUM

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Abstract

The invention belongs to the filed 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 organic polymer 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 polymer 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 breathable 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 polyurethan...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J5/10C08L75/04C08K13/02B29C41/36B29C41/16
Inventor 徐卫林崔卫钢李文斌郭维祺
Owner WUHAN TEXTILE UNIV
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