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Method for preparing urethane elastomer

A polyurethane elastomer and polyester diol technology, which is applied in the field of polyurethane elastomer preparation, can solve the problems of polyurethane performance limitations and inability to meet various needs

Active Publication Date: 2011-01-12
广东大盈新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The special structure of polyurethane resin makes it have excellent chemical properties and unparalleled processing properties such as unique flexibility, wear resistance, low temperature resistance, adhesion, gloss and high cohesion and curing speed, making polyurethane products in many It has been widely used in the field, but at present, most of the polyurethanes used for elastomers in China are polyester polyols produced by one-step method, so the performance of polyurethane is limited and cannot meet various needs.

Method used

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  • Method for preparing urethane elastomer
  • Method for preparing urethane elastomer
  • Method for preparing urethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 100 parts of ethylene glycol (EG) and 247 parts of adipic acid (AA) into the reaction bottle, raise the temperature to 225°C, adjust the stirring speed, strictly control the distillation temperature at 102±3°C on the way, and keep it warm for 1 hour after reaching the temperature. If the distillation temperature drops to 80°C, reduce the pressure to 0.8MPa and continue the reaction for half an hour, measure the acid value, if the acid value is 112±3mgKOH / g, lower the temperature to 160°C, put in the measured 1,4-butanediol, Raise the temperature to 230°C and react for 1 hour, add the catalyst n-tetrabutyl titanate and reduce the pressure to -1MPa to react for half an hour, measure the acid value, if the acid value is figure 1 As shown, its comparison with the original one is shown in the table below.

[0016]

[0017] Use 100 parts of the above-mentioned self-made chain-extending polyester polyol, 4.5 parts of chain extender 1,4-butanediol (BDO), and 3.1 parts of ...

Embodiment 2

[0020] Replace ethylene glycol with diethylene glycol (DEG), put 170 parts of diethylene glycol, and 247 parts of adipic acid (AA) into the reaction bottle, raise the temperature to 230°C, adjust the stirring speed, and strictly control the distillation temperature at 102±3°C on the way . After the temperature is reached, keep the reaction for 1 hour. If the distillation temperature drops to 80°C, reduce the pressure to 0.8MPa and continue the reaction for half an hour. Measure the acid value. If the acid value is 112±3mgKOH / g. Lower the temperature to 160°C, put in the measured 1,4-butanediol, raise the temperature to 230°C and react for 1 hour, add the catalyst n-tetrabutyl titanate and reduce the pressure to -1MPa to react for half an hour, measure its acid value, if the acid value is < 1mgKOH / g, measure its hydroxyl value, if the hydroxyl value is 37±3mgKOH / g, discharge. If the hydroxyl value has not reached, continue to discharge alcohol until the chain-extended polyeste...

Embodiment 3

[0023] Replace ethylene glycol diethylene glycol (DEG) with diethylene glycol (DEG), put 170 parts of diethylene glycol (DEG) and 247 parts of adipic acid (AA) into the reaction bottle, raise the temperature to 228 ° C, adjust the stirring speed, During the process, the distillation temperature was strictly controlled at 102±3°C. After the temperature is reached, keep the reaction for 1 hour. If the distillation temperature drops to 80°C, reduce the pressure to 0.8MPa and continue the reaction for half an hour. Measure the acid value. If the acid value is 112±3mgKOH / g. Cool down to 160°C, put in measured ethylene glycol (EG), heat up to 230°C and react for 1 hour, add catalyst n-tetrabutyl titanate and depressurize to -1MPa, react for half an hour, measure its acid value, if the acid value is <1mgKOH / g, measure its hydroxyl value, if the hydroxyl value is 37±3mgKOH / g, discharge. If the hydroxyl value has not reached, continue to discharge alcohol until the chain-extended pol...

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Abstract

The invention relates to a preparation method for polyurethane elastomer, which has the characteristics that the preparation method is that firstly, 28 to 30 percent of chain extension type polyester diol, 1 to 1.15 percent of 1.4- butanediol as a chain extender and 0.9 to 1.05 percent of glycol simultaneously dissolve in 57.4 to 59.4 percent N, N-dimethylformamide, and are added into a four-necked bottle to vacuumize and mechanically stir for 50 to 70 minutes and then are drained off water, then are added with 9.8 to 10.5 percent diphenylmethane diisocyanate, 0.1 thousandth catalysts and 0.25 to 0.3 percent antioxidants and heated up to 70 DEG C to 75 DEG C, react for 1.5 to 2.5 hours to observe the viscosity after the reaction is completed, and are added with the diphenylmethane diisocyanate accordingly to adjust high the viscosity and added with N, N-dimethylformamide to react for 4 to 6 hours, with the solid contented being controlled at 30 percent and the viscosity being controlled at 100000 centipoise second, then to obtain the qualified amine ester solution; secondly, 20g amine ester solution is taken to dissolve into 30g N, N-dimethylformamide to stir evenly and be placed into a glass mould after being deformed overnight for 8 to 10 hours, and then is placed in an infrared lamp box to dry membranes for 11 to 13 hours and air the membranes for 11 to 13 hours under the room temperature, and the qualified polyurethane elastomer is prepared. The polyurethane elastomer has a special performance, can be used in some special fields without the traditional polyurethane. Moreover, the preparation method is not limited by the raw materials, and can be freely collated to satisfy the performances required by the customers.

Description

technical field [0001] The invention relates to a preparation method of polyurethane elastomer. Background technique [0002] The special structure of polyurethane resin makes it have excellent chemical properties and unparalleled processing properties such as unique flexibility, wear resistance, low temperature resistance, adhesion, gloss and high cohesion and curing speed, making polyurethane products in many It has been widely used in the field, but at present, most of the polyurethanes used for elastomers in China are polyester polyols produced by one-step method, so the performance of polyurethane is limited and cannot meet various needs. In order to make polyurethane elastomers have special properties in many aspects, changing the structure of polyurethane soft segments to meet the special properties of the prepared polyurethane elastomers has become an important issue in the polyurethane industry. Contents of the invention [0003] The purpose of the present invent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/08C08G18/66C08J5/18C08L75/06
Inventor 曹永沂邓慕建罗裕杰李剑华
Owner 广东大盈新材料科技有限公司
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