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Wearing resistance enhanced pouring type urethane elastomer composition

A polyurethane elastomer and composition technology, applied in the field of cast polyurethane elastomer composition, can solve the problems of high vapor pressure, hazards, high volatility, etc., and achieve the effect of improving mechanical properties and wear resistance, and good process performance

Inactive Publication Date: 2009-01-21
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the high vapor pressure of TDI (1.33Pa at 20°C), high volatility and high toxicity, it will cause great harm to the human body during production and processing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepolymer: 75% polyester polyol (CMA1024) with molecular weight of 1000, 8.5% diphenylmethane diisocyanate (MDI-100), 16.5% toluene diisocyanate (TDI-80), react at 70°C for 2 to 3 hours, vacuum (-0.095MPa) The air bubbles are removed, and a prepolymer with an isocyanate content of 5% is obtained. .

[0026] The curing agent is selected from 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA)

[0027] Prepolymer and MOCA with 0.9 NH 2 / NCO equivalent ratio for mixing reaction, mixing temperature is 80 ℃, product vulcanization temperature is 100 ℃, vulcanization 40 minutes demoulding, after vulcanization at 110 ℃ for 10 hours, a polyurethane elastomer product is obtained.

Embodiment 2

[0029] Prepolymer: 80% polyester polyol (ODX150) with a molecular weight of 1500, 7% diphenylmethane diisocyanate (MDI-50), 13% toluene diisocyanate (TDI-80) react at 70℃~90℃ 2~ The bubbles were removed by vacuum (-0.095MPa) for 3 hours, and a prepolymer with an isocyanate content of 4.1% was obtained.

[0030] The curing agent is selected from 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA)

[0031] Prepolymer and MOCA with 0.9 NH 2 / NCO equivalent ratio for mixing reaction, mixing temperature is 90 ℃, product vulcanization temperature is 115 ℃, vulcanization 60 minutes demoulding, after vulcanization at 100 ℃ for 8 hours to obtain polyurethane elastomer products.

Embodiment 3

[0033] Prepolymer: Polyester polyol (ODX218) with molecular weight 2000 85%, diphenylmethane diisocyanate (liquefied MDI) 3.2%, toluene diisocyanate (TDI-80) 11.3%, react at 80°C for 2 to 3 hours, vacuum ( -0.095MPa) Remove air bubbles to obtain a prepolymer with an isocyanate content of 3%.

[0034] The curing agent is selected from 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA)

[0035] Prepolymer and MOCA with 0.9 NH 2 / NCO equivalent ratio for mixing reaction, mixing temperature is 80°C, product vulcanization temperature is 100°C, vulcanized for 30 minutes and demolded, and vulcanized at 110°C for 9 hours to obtain polyurethane elastomer products.

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PUM

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Abstract

A cast type polyurethane elastomer compound with improved abrasion resistance consists of two constituents of a prepolymer and an aroma diamine curing agent. MDI / TDI-80 cross blending diisocyanate reacts with polyester polyol at a temperature of between 70 to 90 DEG C to obtain a prepolymer containing 3 to 5 percent of isocyanic acid radical. The invention adopts the MDI / TDI-80 cross blending diisocyanate to replace TDI-80, thereby improving the abrasion resistance of a TDI-80 type polyurethane elastomer.

Description

Technical field [0001] The invention relates to a cast polyurethane elastomer composition. Background technique [0002] Polyurethane elastomer is a block copolymer composed of soft and hard segments. It is characterized by a wide adjustment range of product hardness, both rubber elasticity and plastic hardness, and has good mechanical properties. In recent years, it has penetrated into the national economy and people's lives and has become a new synthetic material. The prepolymers used to produce polyurethane elastomers are usually made by the reaction of TDI or MDI with polyols. The former usually uses MOCA as a chain extender, and the latter uses glycols such as 1,4-butanediol, etc. As a chain extender, but glycol as a chain extender, due to its strong water absorption, the product is easy to foam, and the processability is worse than that of MOCA. [0003] TDI polyurethane prepolymer includes two types: TDI-100 and TDI-80. Since TDI-100 contains more than 98.5% of 2,4-toluene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/10
Inventor 陈海良张芳贾雪芹朱光宁宋淑芳
Owner SHANDONG INOV POLYURETHANE
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