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Preparation method of moisture-absorbing and breathable polyurethane membrane

A polyurethane film and polyurethane technology, which is applied in the field of preparation of moisture-absorbing and breathable polyurethane films, can solve the problems of poor comfort in use, poor moisture absorption and breathability, and poor affinity of finished products, so as to improve moisture absorption and moisture permeability, improve moisture absorption, and improve use comfort performance effect

Inactive Publication Date: 2016-06-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solvent-based dry-process polyurethane film has excellent mechanical properties, the surface of the film is dense, it is difficult for water vapor to pass through, and there are few hydrophilic groups in the molecular chain segment, which has poor affinity for water and poor moisture absorption and air permeability, resulting in the failure of the finished product. poor comfort

Method used

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  • Preparation method of moisture-absorbing and breathable polyurethane membrane
  • Preparation method of moisture-absorbing and breathable polyurethane membrane
  • Preparation method of moisture-absorbing and breathable polyurethane membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Dissolve polytetrahydrofuran ether diol in N,N-dimethylformamide, the mass ratio of the two is 1:1.5, and add isophorone diisocyanate dropwise under the condition of nitrogen protection, wherein; The molar ratio of -NCO and -OH in tetrahydrofuran ether diol and isophorone diisocyanate is 2.0:1, with dibutyltin dilaurate catalyst, and the amount of catalyst added is polytetrahydrofuran ether diol and isophorone 0.07% of the total mass of diisocyanate, stirred and reacted at 80°C for 1.5h; The molar ratio of -OH and -OH is 2.0:1, stirred and reacted at 80°C for 2.5h, and chain extension is carried out; finally adding an end-capping agent absolute ethanol; making polytetrahydrofuran ether diol and isophorone diisocyanate The molar ratio of -NCO and -OH is 1:0.5, stirred and reacted at 80°C for 1 hour, and partially blocked to obtain a linear polyurethane prepolymer;

[0025] Step 2: Mix the linear polyurethane prepolymer obtained in step 1 with the amino-terminate...

Embodiment 2

[0029] Step 1: Dissolve polytetrahydrofuran ether diol in N,N-dimethylformamide, the mass ratio of the two is 1:1.6, and add isophorone diisocyanate dropwise under the condition of nitrogen protection, wherein; The molar ratio of -NCO and -OH in tetrahydrofuran ether diol and isophorone diisocyanate is 2.5:1, with dibutyltin dilaurate as a catalyst, and the amount of catalyst added is polytetrahydrofuran ether diol and isophorone 0.08% of the total mass of diisocyanate, stirred and reacted at 75°C for 2h; then added small molecule chain extender 1,4-butanediol, so that polytetrahydrofuran ether diol and -NCO in isophorone diisocyanate and The molar ratio of -OH is 2:1, and the reaction is stirred at 85°C for 2.5h to carry out chain extension; finally, the end-capping agent absolute ethanol is added; so that polytetrahydrofuran ether glycol and isophorone diisocyanate - The molar ratio of NCO and -OH is 1:0.5, stirred and reacted at 75°C for 2 hours, and partially blocked to ob...

Embodiment 3

[0034]Step 1: Dissolve polytetrahydrofuran ether diol in N,N-dimethylformamide, the mass ratio of the two is 1:1.6, and add isophorone diisocyanate dropwise under the condition of nitrogen protection, wherein; The molar ratio of -NCO and -OH in tetrahydrofuran ether diol and isophorone diisocyanate is 2.3:1, with dibutyltin dilaurate catalyst, and the amount of catalyst added is polytetrahydrofuran ether diol and isophorone 0.09% of the total mass of diisocyanate, stirred and reacted at 70°C for 2h; then added small molecule chain extender 1,4-butanediol, so that polytetrahydrofuran ether diol and -NCO in isophorone diisocyanate and The molar ratio of -OH is 2.5:1, and the reaction is stirred at 75°C for 3 hours to carry out chain extension; finally, the end-capping agent absolute ethanol is added; the -NCO in polytetrahydrofuran ether diol and isophorone diisocyanate The molar ratio of -OH to -OH is 1:0.6, stirred and reacted at 75°C for 1.5h, and partially blocked to obtain ...

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Abstract

A method for preparing a moisture-absorbing and breathable polyurethane film. First, using isophorone diisocyanate, polytetrahydrofuran ether glycol, 1,4-butanediol and absolute ethanol as raw materials, and using dibutyltin dilaurate as a catalyst, the A linear polyurethane prepolymer is obtained; then a linear polyurethane prepolymer is copolymerized with an amino-terminated hyperbranched polymer to obtain a hyperbranched polyurethane containing active amino groups; then the hyperbranched polyurethane is added to the N, N-dimethyl The casting solution is obtained in the base formamide solution, and the casting solution is dried on a polytetrafluoroethylene glass plate to obtain a polyurethane / hyperbranched polyurethane blend film; the blend film prepared by the present invention is due to the hyperbranched The addition of polyurethane increases the number of hydrophilic groups in the components of the composite film, which is conducive to improving the moisture absorption and moisture permeability of the blend film. It is used in the production of PU synthetic leather, leather finishing agents and textile coatings. It can improve the moisture absorption and breathability of the product.

Description

technical field [0001] The invention belongs to the technical field of polyurethane material processing, and in particular relates to a method for preparing a moisture-absorbing and breathable polyurethane film. Background technique [0002] Hyperbranched polymers have attracted much attention due to their unique structure and physical and chemical properties, and have been widely used in coatings, resin modification aids and processing agents, cross-linking agents, drugs and gene carriers, nanotechnology, field of supramolecular science. [0003] Polyurethane (PU) is a macromolecular compound containing repeated urethane groups in the main chain. It has high strength, wear resistance, low temperature resistance, chemical resistance, and excellent resilience. It has been widely used in PU synthetic leather. , Leather finishing agent and textile coating. Although the solvent-based dry-process polyurethane film has excellent mechanical properties, the surface of the film is ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L75/04C08L75/08C08G18/75C08G18/66C08G18/48C08G18/32C08G18/28C08G18/12D06N3/14
CPCC08J5/18C08G18/12C08G18/282C08G18/3206C08G18/4009C08G18/4854C08G18/6674C08G18/755C08J2375/04C08J2375/08D06N3/14
Inventor 任龙芳陈婷强涛涛王学川
Owner SHAANXI UNIV OF SCI & TECH