Preparation method of moisture-permeable plasticized polyurethane rubber

A polyurethane rubber and moisture-permeable technology is applied in the field of preparation of moisture-permeable plasticized polyurethane rubber, which can solve the problems of poor moisture permeability, poor mechanical properties, poor plasticity, etc. The effect of improving low temperature plasticity

Inactive Publication Date: 2018-07-06
仇颖莹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is aimed at the fact that polyurethane rubber will be exposed to water medium in many practical applications at present, and the moisture permeability of polyurethane rubber with polyether poly

Method used

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  • Preparation method of moisture-permeable plasticized polyurethane rubber

Examples

Experimental program
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Effect test

example 1

[0026] Pass nitrogen to the three-necked flask equipped with a stirrer and a constant pressure dropping funnel to expel the air, add 20mL 1,4-butanediol, 40mL boron trifluoride ether and 30mL tetrahydrofuran to the three-necked flask, and place the three-necked flask in an ice-water bath , start the stirrer and mix and stir for 30min at a speed of 400r / min to obtain the initial mixed solution; use a constant pressure dropping funnel to drop 30mL of epichlorohydrin into the above-mentioned three-necked flask at a dropping rate of 5mL / min, keep React in a water bath for 4 hours, then add 4 mL of distilled water to the three-necked flask, and let it stand for 5 minutes to obtain the reaction product. The final reaction product was placed in a distillation flask, heated to 90°C, and distilled for 3 hours to obtain a tetrahydrofuran / epichlorohydrin copolyether; take 50mL tetrahydrofuran / epichlorohydrin copolyether, 20mL dimethyl sulfoxide, 5g Sodium azide and 2g of sodium sulfonate...

example 2

[0028] Pass nitrogen to the three-necked flask equipped with a stirrer and a constant pressure dropping funnel to exhaust the air, add 25mL 1,4-butanediol, 45mL boron trifluoride ether and 32mL tetrahydrofuran to the three-necked flask, and place the three-necked flask in an ice-water bath , start the agitator and mix and stir for 32min at a speed of 450r / min to obtain the initial mixed solution; use a constant pressure dropping funnel to drop 35mL of epichlorohydrin into the above-mentioned three-necked flask at a dropping rate of 6mL / min, keep React in a water bath for 4.5 hours, then add 4 mL of distilled water to the three-necked flask, and let it stand for 7 minutes to obtain the reaction product. The washed reaction product was placed in a distillation flask, heated to 95°C, and distilled for 3.5 hours to obtain tetrahydrofuran / epichlorohydrin copolyether; take 60mL tetrahydrofuran / epichlorohydrin copolyether, 25mL dimethyl sulfoxide , 7g of sodium azide, and 2g of sodiu...

example 3

[0030] Pass nitrogen to the three-necked flask equipped with a stirrer and a constant pressure dropping funnel to exhaust the air, add 30mL 1,4-butanediol, 50mL boron trifluoride ether and 35mL tetrahydrofuran to the three-necked flask, and place the three-necked flask in an ice-water bath , start the agitator and mix and stir for 35min at a speed of 500r / min to obtain the initial mixed solution; use a constant pressure dropping funnel to drop 40mL of epichlorohydrin into the above-mentioned three-necked flask at a dropping rate of 7mL / min, keep React in a water bath for 5 hours, then add 5 mL of distilled water to the three-necked flask, and let it stand for 10 minutes to obtain the reaction product. The final reaction product was placed in a distillation flask, heated to 100°C, and distilled for 4 hours to obtain a tetrahydrofuran / epichlorohydrin copolyether; take 70mL tetrahydrofuran / epichlorohydrin copolyether, 30mL dimethyl sulfoxide, 8g Put sodium azide and 3g sodium sul...

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Abstract

The invention discloses a preparation method of a moisture-permeable plasticized polyurethane rubber, and belongs to the technical field of rubber preparation. According to the preparation method provided by the invention, 1,4-butanediol is used as an initiator; boron trifluoride diethyl etherate is used as a catalyst; tetrahydrofuran and epoxy chloropropane are polymerized by cationic ring-opening polymerization to form a copolyether of tetrahydrofuran/epoxy chloropropane; then sodium azide is added for the azidation of the copolyether of the tetrahydrofuran/epoxy chloropropane; and a prepolymer is obtained, so that the moisture permeability of polyurethane rubber is improved. The prepolymer provided by the preparation method is a copolyether of tetrahydrofuran/glycidyl azide polymer; themain chain segment of the prepolymer is tetrahydrofuran, so that the glass transition temperature of the copolyether is reduced; the glycidyl azide polymer chain segment hinders the flexibility of the main chain segment due to azide groups on side chains, the low-temperature-resistant lower limit of the glycidyl azide polymer is lower, so that the low-temperature plasticity of the polyurethane rubber is improved; and the glycidyl azide polymer is used as an adhesive, so that the mechanical property of the polyurethane rubber is improved, and the application prospect is wide.

Description

technical field [0001] The invention discloses a method for preparing moisture-permeable plasticized polyurethane rubber, which belongs to the technical field of rubber preparation. Background technique [0002] Polyurethane rubber is a series of elastomer materials containing more carbamate groups on the polymer main chain. It is actually polyurethane rubber, referred to as polyurethane rubber or polyurethane rubber or polyurethane elastomer. In addition to carbamate groups, the polymer chain also contains ester groups, ether groups, urea groups, aryl groups and aliphatic chains. It is usually formed by the reaction of oligomer polyol, polyisocyanate and chain extender. Polyurethane rubber forms different structures and varieties with different raw materials and proportions, reaction methods and conditions. [0003] The traditional classification of polyurethane rubber is divided according to the processing method, which is divided into cast polyurethane elastomer, mixing...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/64C08G18/50C08G18/12C08G18/32C08G18/34C08F283/00C08F222/06
CPCC08G18/7614C08F283/006C08G18/12C08G18/4081C08G18/5021C08G18/5072C08G18/64C08G18/348C08G18/3206C08F222/06
Inventor 仇颖莹何伟仁陈可
Owner 仇颖莹
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