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Rapid mold stripping urethane elastomer compoistion and use method thereof

A polyurethane elastomer and composition technology, applied in the field of cast polyurethane elastomers, can solve the problems of low TDI saturated vapor pressure, environmental hazards, and long demolding time, and achieve high saturated vapor pressure, reduced energy consumption, and excellent mechanical properties. performance effect

Active Publication Date: 2009-01-28
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of such products mostly requires high temperature (110-120°C) vulcanization molding, and the demoulding time is long. After demoulding, the product needs to be heated and vulcanized at 110-120°C, which not only affects the output, but also wastes energy.
Moreover, during the production and processing of the prepolymer of the TDI system, due to the low saturated vapor pressure of TDI, high volatility and high toxicity, it will cause great harm to the human body and the surrounding environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Polymer components: 30% of polyether polyol (PPG1000) with a functionality of 2 and a molecular weight of 1000 and 34% of a polyether polyol (PPG3600) with a functionality of 3 and a molecular weight of 6000, 3,3'-dichloro- 35% of 4,4'-diaminodiphenylmethane (MOCA), 1% of organic bismuth catalyst and dehydration at 100-110°C and -0.095MPa until the water content is less than 0.05%, to obtain a polymer component.

[0024] (2) Prepolymer component: 45% polyether polyol (PPG1000) with 2 functionalities and a molecular weight of 1000, and 55% diphenylmethane diisocyanate MDI-50 were reacted at 70°C to 90°C for 2 hours to obtain isocyanate Prepolymer with 15% cyanate content.

[0025] (3) Reaction part (during product production): Mix the prepolymer component and the polymer component at a ratio of 1:1, and the mixing temperature is 30°C. Then pouring and vulcanization molding (vulcanization at 70° C. to 80° C.) according to the usual method, mold opening after 10 minut...

Embodiment 2

[0027] (1) Polymer component: 30.5% of polyether polyol (PPG2000) with functionality 2 and molecular weight 2000 and polyether polyol (PPG3600) with functionality 3 and molecular weight 6000 39, 3,3'-dichloro-4 , 30% of 4′-diaminodiphenylmethane (MOCA) and 0.5% of organic mercury catalyst are dehydrated at 100-110°C and -0.095MPa until the water content is less than 0.05%, to obtain a polymer component.

[0028] (2) Prepolymer component: polyether polyol (PPG-2000) with 2 functionalities and molecular weight of 2000 (PPG-2000) 54.5%, diphenylmethane diisocyanate MDI-100 20% and MDI-50 25.5% at 70°C Reaction at -90°C for 2 hours yielded a prepolymer with an isocyanate content of 13%.

[0029] (3) Reaction part (during product production): Mix the prepolymer component and the polymer component at a ratio of 1:1, and the mixing temperature is 30°C. Then pouring and vulcanization molding (vulcanization at 70° C. to 80° C.) according to the usual method, mold opening after 10 minu...

Embodiment 3

[0031] (1) Polymer components: polyether polyol (PPG1000) 20 with functionality 2 and molecular weight 1000 and polyether polyol (PPG3600) 59 with functionality 3 and molecular weight 6000, 3,3'-dichloro-4, 20% of 4'-diaminodiphenylmethane (MOCA) and 1% of organic lead catalyst are dehydrated at 100-110°C and -0.095MPa until the water content is less than 0.05%, to obtain a polymer component.

[0032] (2) Prepolymer component: polyether polyol (PPG2000) with 2 functionalities and molecular weight of 2000 (PPG2000) 63%, diphenylmethane diisocyanate MDI-50 24%, liquefied MDI 13%, at 70 ° C to 90 °C for 2 hours to obtain a prepolymer with an isocyanate content of 9%.

[0033] (3) Reaction part (during product production): Mix the prepolymer component and the polymer component at a ratio of 1:1, and the mixing temperature is 30°C. Then pouring and vulcanization molding (vulcanization at 70° C. to 80° C.) in the usual way, mold opening after 10 minutes, and post-vulcanization to o...

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PUM

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Abstract

The invention relates to a fast-demoulding casting type PU elastomer compound; two component systems are adopted; one is a prepolymer component; vulcabond is reacted with polylol for obtaining a prepolymer with NCO percent is equal to 9 to 15 percent (weight); polypropylene oxide ether polylol with molecular weight of 1000 to 3000 and a functionality of 2 to 3 is adopted as the polylol; the second is a polymer component which consists of the polypropylene oxide ether polylol with a molecular weight of 1000 to 3000 and a functionality of 2 to 3, an aromatic diamine firming agent and a catalyst. The prepolymer component and the polymer component are mixed according to a weight ratio of 1: 1, cast, vulcanized and shaped; a product can be demoulded in ten minutes without post-vulcanization, thus obtaining the fast-demoulding casting type PU elastomer with a product rigidity of shoreA80 to 97 and excellent mechanical properties. The fast-demoulding casting type PU elastomer compound is mainly used for manufacturing the products of PU elastomer such as polyurethane rubber wheel, polyurethane plank stuff and rubber roller, etc.

Description

technical field [0001] The invention relates to a casting type polyurethane elastic body which can be released quickly. Background technique [0002] Polyurethane is a polymer synthetic material with properties between rubber and plastic. It is characterized by a wide range of hardness adjustment. It has both the elasticity of rubber and the hardness of plastic, and has good mechanical properties, wear resistance and resilience. . The prepolymers used to produce polyurethane elastomers are usually prepared by reacting TDI or MDI with polyols. The former usually uses amine chain extenders for the production of polyurethane elastomers, such as MOCA, E-300, etc., and the latter Those usually use alcohol chain extenders such as 1,4 butanediol, HQEE and so on. Most of these products require high-temperature (110-120°C) vulcanization and molding, and the demoulding time is long. After demoulding, the products need to be heated and vulcanized at 110-120°C, which not only affects ...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/66C08G18/10B29C39/00B29C35/02B29K75/00
Inventor 李健张芳陈海良陈伟朱光宁
Owner SHANDONG INOV POLYURETHANE
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