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A kind of cross-linked hydrogenated nitrile polyurethane

A hydrogenated nitrile and polyurethane technology, which is applied in the field of cross-linked hydrogenated nitrile polyurethane and its preparation, can solve problems such as low mechanical properties, poor ozone aging resistance, and affecting product performance, so as to broaden the application range and overcome Poor aging resistance, overcoming the effect of low mechanical strength

Active Publication Date: 2018-12-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nitrile polyurethane has excellent hydrolysis resistance and low temperature flexibility, but because of the unsaturated structure containing a large amount of carbon-carbon double bonds in the molecular chain, it has poor ozone aging resistance and affects the performance of the product during long-term use
Compared with the polyurethane synthesized by polyester polyol, the main chain of nitrile polyurethane is hydrocarbon main chain because of its soft segment, so the mechanical properties of the product are not high, which limits the wide use of nitrile polyurethane

Method used

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  • A kind of cross-linked hydrogenated nitrile polyurethane
  • A kind of cross-linked hydrogenated nitrile polyurethane
  • A kind of cross-linked hydrogenated nitrile polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Get hydroxyl-terminated liquid nitrile rubber (HTBN) and be dissolved in xylene, be mixed with the solution of mass fraction 10wt%; Get 300g above-mentioned solution in the 500ml there-necked bottle, add 29.88g acetic acid, then add dropwise hydrogen peroxide solution ( Aladdin reagent, mass fraction 30%) 84.66g, stirred and reacted at 65°C for 4h. The reacted mixed solution is precipitated, washed, and dried to obtain epoxidized hydroxyl-terminated liquid nitrile rubber (EHTBN), and the epoxy degree E%=7% is calculated by nuclear magnetic detection.

[0036] (2) use xylene as solvent, EHTBN is made into the glue solution that mass concentration is 10%, adds glue solution 250g in autoclave, adds Wilkinson catalyst 0.2g again, ligand triphenylphosphine 0.6g, The temperature was 110° C. and the hydrogen pressure was 4 MPa, and the hydrogenation reaction was carried out for 8 hours. After the reaction, a hydroxyl-terminated liquid hydrogenated nitrile rubber (E-HHTBN) ...

Embodiment 2

[0040]The step (1) epoxidation time is extended to 6h, and other conditions remain unchanged, namely obtain EHTBN of E%=10%; The higher the epoxidation degree of EHTBN will make the product hydroxyl obtained by step (3) ring-opening reaction Value is higher; Therefore, the isocyanate content of step (4) gained prepolymer reduces, and its value is 5.49% after measuring, calculates according to material proportion, needs to add MOCA quality and be 2.62g.

[0041] Other operations are the same as in Example 1.

Embodiment 3

[0043] Prolong step (1) epoxidation time to 8h, other conditions remain unchanged, namely obtain the EHTBN of E%=13%; The epoxidation degree of EHTBN is higher, will make the product hydroxyl that step (3) ring-opening reaction obtains Value is higher; Therefore, the isocyanate content of step (4) gained prepolymer reduces, and its value is 4.89% after measuring, calculates according to material proportion, needs to add MOCA quality and is 2.33g.

[0044] Other operations are the same as in Example 1.

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Abstract

The invention provides cross-linked hydrogenated butyronitrile type polyurethane. The cross-linked hydrogenated butyronitrile type polyurethane is formed by cross-linking multifunctional hydrogenated terminal hydroxyl liquid nitrile rubber and isocyanato; and the multifunctional hydrogenated terminal hydroxyl liquid nitrile rubber is obtained by introducing an epoxy group in terminal hydroxyl liquid hydrogenated nitrile rubber and then introducing hydroxyl in part of the epoxy group in a ring opening manner by carboxylic acid. The invention further provides a preparation method of the cross-linked hydrogenated butyronitrile type polyurethane. By the novel cross-linked hydrogenated butyronitrile type polyurethane provided by the invention, the shortcoming that butyronitrile type polyurethane is poor in ageing resistance and not high in mechanical strength is overcome. Measurement of swelling ratio and gel fraction proves that chemical crosslink bonds are introduced in the polyurethane, and owing to introduction of the chemical crosslink bonds, the shortcoming that the mechanical property of the polyurethane is poor at high temperature due to the fact that the polyurethane is lack of the chemical crosslink bonds is also overcome.

Description

technical field [0001] The invention belongs to the field of organic polymer materials, and in particular relates to a crosslinked hydrogenated nitrile polyurethane and a preparation method thereof. Background technique [0002] The raw materials for the preparation of polyurethane include oligomer polyols, chain extenders and polyisocyanates. Oligomer polyols include polyester polyols, polyether polyols, polyolefin polyols, and other oligomeric polyols. The elastomer made of hydroxyl-terminated polybutadiene-acrylonitrile in polyolefin polyol is referred to as hydroxyl-terminated nitrile rubber (HTBN). [0003] Nitrile polyurethane has excellent hydrolysis resistance and low temperature flexibility, but because of the unsaturated structure containing a large amount of carbon-carbon double bonds in the molecular chain, it has poor ozone aging resistance and affects the performance of the product during long-term use. Compared with polyurethanes synthesized from polyester p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/69C08G18/32C08C19/02C08C19/40C08C19/06
CPCC08C19/02C08C19/06C08C19/40C08G18/3808C08G18/69C08G18/7614
Inventor 岳冬梅董建军梁璐桑海涛张立群
Owner BEIJING UNIV OF CHEM TECH
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