Casting type polyurethane elastomer and its preparing method

A polyurethane elastomer and prepolymer technology, which is applied in the field of casting polyurethane elastomer and its preparation, can solve the problems of incomplete and incomplete chain extension and curing, and no increase in use temperature, so as to improve hydrolysis and temperature resistance The effect of improving resistance and wear resistance

Inactive Publication Date: 2006-09-13
宜兴市宙斯泵业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only does it not indicate that the use temperature is increased, but also because of the use of a chain extender for one-time chain extension curing, there is still incomplete and incomplete chain extension curing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Take 57 parts of polycaprolactone, dehydrate at 120-140°C, cool down to 50-60°C, add 43 parts of isocyanate (MDI), and polymerize for 1.5-2 hours under the protection of nitrogen to obtain a temperature of 80-60°C. Prepolymer at 90°C. Take the composite chain extender whose total amount is 30% of the prepolymer, first add 1,4-butanediol accounting for 15%wt of the total amount of the chain extender under stirring, and then add 1,4-butanediol accounting for 57% of the total amount of the chain extender Hydroquinone-bis(β-hydroxyethyl)ether and 28% resorcinol-bis(β-hydroxyethyl)ether are stirred and reacted within one minute, poured into a mold for molding, and then closed and pressurized for vulcanization.

Embodiment 2

[0021] Example 2: Take 60 parts of polycaprolactone, dehydrate at 120-140 ° C, cool to 50-60 ° C, add 40 parts of isocyanate (MDI), take a composite chain extender whose total amount is 13% of the prepolymer, in In the state of stirring, first add 1,4-butanediol accounting for 12% of the total amount of chain extender, and trimethylolpropane accounting for 3.6% of the total amount of chain extender, and then add hydrogen accounting for 59.4% of the total amount of chain extender Quinone-bis(β-hydroxyethyl) ether (HOEE), and 25% resorcinol-bis(β-hydroxyethyl) ether, the reaction is completed within one minute, poured into a mold for molding, clamping and adding Press vulcanization.

Embodiment 3

[0022] Embodiment 3: As mentioned above, wherein polycaprolactone is 76 parts, 4,4'-dicyclohexylmethane diisocyanate (PPDI) is 24 parts. The total amount of the compound chain extender is 18% of the prepolymer, wherein 1,4-butanediol of 28% of the total amount of the chain extender is added for the first time, and 48% of the total amount of the chain extender is added for the second time. (β-hydroxyethyl) ether and 24% resorcinol-bis(β-hydroxyethyl) ether.

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PUM

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Abstract

The invention relates to improvement of the pouring polyurethane elastomer, characterized in that the multi-alcohols is the gathering caprolactone and the enlarging chain agent accounts for the 7.5-30wt percentage of the gross of performed polymer and it includes three complex enlarging chain agent which is 1,4-butanediol, the hydroquinone-double(beta-ethoxyl) aether and the resorcin-double(beta- ethoxyl) eather at last. The composed performed polymer is carried under the inertance gas coverage; the enlarging chain agent is added twice at last and the action of the enlarging chain is finished one minute approximately. Comparing with the existing polyurethane, the polyurethane provided by the invention is advanced greatly in the temperature resistance and resistance to wear; the application temperature can be reached to the 100-150 degree and it can be improved 20-70 degree comparing the existing pouring polyurethane elastomer; the resistance to wear can be improved 30% upwards.

Description

technical field [0001] The invention is an improvement on cast polyurethane elastomer, in particular relates to a cast polyurethane elastomer with higher service temperature and better wear resistance and a preparation method. Background technique [0002] Casting polyurethane elastomer is obtained by reacting polyol polymer with isocyanate to obtain prepolymer, and then cured with a chain extender (such as MCOA). However, due to the large polarity of the polyol ester group, the imbalance of the two-terminal molecules, resulting in differences in molecular activity, and the presence of inert molecules in the polymerization reaction, the chain extension reaction is incomplete and incomplete, reducing the NCO design content of the prepolymer. , so that its physical properties (such as temperature resistance and wear resistance) are still not ideal, especially the temperature resistance, which can only guarantee its excellent performance when it is used below 80°C. When the use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08K5/04B29C39/00
Inventor 王世锋蒋龙福
Owner 宜兴市宙斯泵业有限公司
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