Method for preparing microporous polyurethane elastomer

A technology of microcellular elastomer and polyurethane, which is applied in the field of preparation of polyurethane microcellular elastomer, can solve the problems of long production cycle, high cost of raw materials, and high requirements for machinery and equipment, and achieve easy operation, low price, lower storage temperature and storage cycle effect

Active Publication Date: 2011-06-15
上海凯众材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this preparation method can obtain microcellular elastomers with excellent performance, it cannot avoid the shortcomings of NDI prepolymers such as short storage time, long production cycle, high raw material costs, and high requirements for machinery and equipment.

Method used

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  • Method for preparing microporous polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After melting 100 parts by weight of polyethylene glycol adipate polyol with a number average molecular weight Mn of 2000 and a hydroxyl value of 56 mgKOH / g at 127° C., add 21 parts by weight of NDI (active component NCO / OH molar ratio For 2), after keeping this temperature for 15min, a clear and transparent polyurethane prepolymer was obtained. Then 26.4 parts by weight of TODI (TODI / NDI molar ratio is 1) was added and cooled to 60°C while stirring to obtain a transparent and clear mixed prepolymer. In addition, 4 parts by weight of water, 2 parts by weight of foam stabilizer, catalyst 0.3 parts by weight, these were stirred and mixed for 2 hours to obtain a chain extender.

[0031] Under the above-mentioned temperature conditions, the mixed prepolymer and the chain extender were mixed and stirred at a weight ratio of 100:50, and a foaming reaction was carried out, and then a post-aging treatment was performed to obtain a sample for evaluation.

Embodiment 2

[0033] For Example 1, 3 parts by weight of water and 5 parts by weight of 1,4-butanediol were used instead of 4 parts by weight of water in the chain extender component.

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Abstract

The invention relates to a method for preparing a microporous polyurethane elastomer, in particular to a microporous polyurethane elastomer which is prepared through a foaming reaction that a chain extender containing a mixture of water, a high molecular weight polyalcohol, a catalyst and a foam stabilizer is stirred and blended into a mixed prepolymer prepared by stirring and blending a prepolymer containing a terminal isocyanate group and prepared by reacting a polyalcohol and 1,5-naphthalene-diisocyanate (NDI) and 3,3'-dimethyl-4,4'-diphenyldiisocyanate (TODI). The invention aims to improve the processability and the storage stability of the NDI and effectively reduce the cost of raw materials of the NDI while keeping the excellent performance of the NDI. The product prepared by the method is mainly used for bearing high-strength damping elements of dynamic fatigue, such as buffering and shock-absorbing elements of traffic tools, such as vehicles and the like, bridge shock-absorbing blocks and the like.

Description

technical field [0001] The invention relates to a preparation method of polyurethane microporous elastomer. Background technique [0002] Polyurethane elastomers with a microporous structure are excellent in vibration damping and impact absorption, and are often used as auxiliary springs for automobile suspension systems from the perspective of dynamic characteristics, durability, and low damping characteristics at high loads. . In particular, NDI-based polyurethane microcellular elastomers are excellent in bending fatigue resistance, and are often used in auxiliary spring parts that require durability. However, compared with other diisocyanate compounds, NDI has high raw material prices, high melting point (127°C), and a considerable tendency to sublimate. The resulting labor hygiene problems force the need to increase industrial expenditures, and due to high reactivity, Therefore, there is a problem that it is difficult to handle. Although NDI is prefabricated to obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/10C08G101/00
Inventor 杨颖韬侯瑞宏曹以前杨亚军
Owner 上海凯众材料科技股份有限公司
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