Hard polyurethane casting material

A technology of rigid polyurethane and pouring materials, applied in the field of polyurethane polymer materials, can solve the problems of low hardness that cannot be used as structural materials, unfavorable manual operation, etc.

Inactive Publication Date: 2003-03-12
MARINE CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In U.S. Patent 5,234,975, fiber-reinforced rigid polyurethane pouring material is reported, but the disadvantage of the invention is that it needs to be poured at about 40-60°C, and the pourable period is about 2-3 minutes, which is not conducive to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Preparation of component A: Add 600g polymethyl polyphenyl polyisocyanate (PAPI) and 200g carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate (LMDI) to the reaction In the kettle, stir at a constant speed, heat to 50-80°C, add 200g of polypropylene oxide diol (molecular weight: 1000, functionality: 2) dropwise into the kettle, keep warm while stirring, and gradually raise the temperature to 85 ±2°C and keep it warm for 3 hours, take a sample to test that the NCO content reaches the theoretical value, then cool and discharge the material to obtain a semi-prepolymer with excess isocyanate. Tested by di-n-butylamine method, the free isocyanate content of component A was 23.5%.

[0024] Preparation of R component: 174g 330N (polyether polyol, molecular weight 4950, functionality 3, Shandong Dongda Chemical Group), 500g 210 (polyether polyol, molecular weight 1000, functionality 2, Shandong Dong Big Chemical Industry Group), 100g trimethylolpropane TMP and 2...

example 2

[0036] Preparation of component A: Add 275g of polymethyl polyphenyl polyisocyanate (PAPI) and 600g of 4,4'-diphenylmethane diisocyanate (MDI) into the reaction kettle, stir at a constant speed, and heat to 50-80°C. Add 125g of polypropylene oxide diol (molecular weight is 2000, functionality is 2) dropwise in kettle, keep warm while stirring, gradually heat up to 85±2°C after dropwise addition and keep warm for 3 hours, take samples to measure NCO content reaches After the theoretical value, the material is cooled and discharged to obtain a semi-prepolymer with excess isocyanate. The free isocyanate content of component A was 29% when tested by the di-n-butylamine method.

[0037]Preparation of R component: 224g 330N (polyether polyol, molecular weight 4950, functionality 3, Shandong Dongda Chemical Group), 500g 210 (polyether polyol, molecular weight 1000, functionality 2, Shandong Dong Big Chemical Industry Group), 100g trimethylolpropane TMP and 150g1,4 butanediol (BDO), ...

example 3

[0051] Preparation of component A: Add 950g of 2,4'-diphenylmethane diisocyanate (2,4'-MDI) into the reaction kettle, stir at a constant speed, heat to 50-80°C, and drop 50g of polycyclic Oxypropane diol (molecular weight is 2000, functionality is 2), keep warm while stirring, gradually heat up to 85±2°C after dropwise addition and keep warm for 3 hours, take samples to measure the NCO content to reach the theoretical value, then cool and discharge, That is, a semi-prepolymer with excess isocyanate is obtained. Tested by the di-n-butylamine method, the free isocyanate content of component A was 32%.

[0052] Preparation of R component: 224g 330N (polyether polyol, molecular weight 4950, functionality 3, Shandong Dongda Chemical Group), 400g 210 (polyether polyol, molecular weight 1000, functionality 2, Shandong Dong Big Chemical Industry Group), 50g 403 (polyether polyol, molecular weight is 300, functionality is 4, Nanjing Jinling Petrochemical), 150g trimethylolpropane TMP ...

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PUM

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Abstract

A hard polyurethane as pouring material contains components A, R and F. The component A is a semi-prepolymer of polyisocyanate and polyether polyol. The R is composed of chain extending agent, polyether polyol and assistant. The F is the reinforcing fibres. Its advantages are high antiwear, anticrossion, shock-damping and anti-impact performance and high size stability.

Description

technical field [0001] The invention relates to a polyurethane polymer material, in particular to a rigid polyurethane pouring material, which is suitable for making structural parts and replaces some metal materials. Background technique [0002] Commonly used polymer composite materials include epoxy resin, unsaturated polyester resin, phenolic resin, polyvinyl resin, etc., but the above materials all have different shortcomings, such as poor toughness of epoxy resin, and thermal shrinkage of unsaturated polyester resin. High rate, poor curing behavior of phenolic resin and polyvinyl resin, poor wear resistance, etc. As a new type of polymer material, polyurethane has high mechanical strength, excellent fatigue strength, thermal shock resistance, wear resistance, tear resistance, etc., and is very suitable for the production of structural parts. [0003] In US Patent No. 5,234,975, fiber-reinforced rigid polyurethane pouring material is reported, but the disadvantage of t...

Claims

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Application Information

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IPC IPC(8): C08G18/18C08G18/72
Inventor 黄微波刘培礼刘东晖王宝柱陈酒姜徐得喜
Owner MARINE CHEM RES INST
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