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Preparation method of polyurethane microcellular elastomer

A technology of microcellular elastomer and polyurethane, applied in the field of preparation of polyurethane microcellular elastomer, can solve the problems of large influence, high production process and equipment requirements, etc.

Active Publication Date: 2018-09-25
洛阳凯众减震科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of MDI is low, which is almost one-twentieth of the price of NDI. Moreover, the NDI production process has a great impact on the environment and requires high production technology and equipment. At present, only a few multinational companies such as Bayer have monopolized Production and supply of NDI

Method used

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  • Preparation method of polyurethane microcellular elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Polyester diol with a number average molecular weight of 1000 and diphenylmethane diisocyanate (MDI) were reacted at 80°C for 2 hours to obtain an isocyanate-terminated prepolymer with a terminal-NCO group content of 20% (wt%). Then, the reaction temperature was raised to 100° C., and reacted for 30 minutes to obtain a terminal isocyanate prepolymer with a terminal-NCO group content of 18% (wt%); the above-mentioned 100 parts of polyester diol and 10 parts of 1, 4-Butanediol, 1 part of water, 0.5 part of Dabco 1027, 0.5 part of Dabco DC 2585 are mixed to form a chain extender composition.

[0021] Using a low-pressure foaming machine, according to the proportion of isocyanate index of 95%, inject the prepolymer and chain extender composition into the mold at 65°C, and release the mold after aging for 25 minutes to obtain a polyurethane microcellular elastomer. Material. The relevant product physical properties are shown in Table 1.

Embodiment 2

[0023] Polyester diol with a number average molecular weight of 6000 and diphenylmethane diisocyanate (MDI) were reacted at 80°C for 2 hours to obtain an isocyanate-terminated prepolymer with a terminal-NCO group content of 18% (wt%). Then, the reaction temperature was raised to 110° C., and reacted for 60 minutes to obtain a terminal isocyanate prepolymer with a terminal-NCO group content of 16% (wt%); the above-mentioned 100 parts of polyester diol and 15 parts of 1, 4-Butanediol, 1.5 parts of water, 1.0 part of Dabco 1027, and 1.0 part of Dabco DC 2585 were mixed to form a chain extender composition.

[0024] Using a low-pressure foaming machine, according to the proportion of isocyanate index of 105%, inject the prepolymer and chain extender composition into the mold at 65°C, and release the mold after aging for 25 minutes to obtain a polyurethane microcellular elastomer. Material. The relevant product physical properties are shown in Table 1.

Embodiment 3

[0026] Polytetrahydrofuran diol with a number average molecular weight of 1500 and diphenylmethane diisocyanate (MDI) were kept at 80°C for 2 hours to react to obtain an isocyanate-terminated prepolymer with a terminal-NCO group content of 20% (wt%). Then, the reaction temperature was raised to 105° C., and reacted for 30 minutes to obtain a terminal isocyanate prepolymer with a terminal-NCO group content of 17% (wt%); the above-mentioned 100 parts of polytetrahydrofuran diol and 50 parts of 1, 4-butanediol, 1.2 parts of water, 0.8 parts of Dabco 1027, 0.8 parts of Dabco DC 2585 are mixed to form a chain extender composition

[0027] Using a low-pressure foaming machine, according to the ratio of the isocyanate index to 102%, inject the prepolymer and chain extender composition into the mold at 65°C, and release the mold after aging for 25 minutes to obtain a polyurethane microcellular elastomer. Material. The relevant product physical properties are shown in Table 1.

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Abstract

The invention discloses a method for preparing microporous polyurethane elastomer and particularly relates to the method, which adopts a staged reaction, for preparing the microporous polyurethane elastomer. The method comprises the steps of preparing a prepolymer, preparing a polyalcohol chain extender composition, carrying out casting, and the like, and carrying out aging, thereby obtaining a microporous polyurethane elastomer material with excellent dynamic fatigue resistance. The microporous polyurethane elastomer material prepared by the method disclosed by the invention has good dynamic fatigue resistance, so that the service life of a product produced from the microporous polyurethane elastomer material is greatly prolonged. The microporous polyurethane elastomer material prepared by the method disclosed by the invention can be applied to, but not limited to, automotive buffer systems, so as to improve the riding comfort of automobiles.

Description

technical field [0001] The invention relates to a preparation method of polyurethane microporous elastomer, which is mainly used for shock absorption of automobiles, bridges and buildings. Background technique [0002] Polyurethane microcellular elastomer is a chemical system formed by pouring a liquid reaction mixture into a mold cavity. The chemical raw materials used mainly include isocyanate, polyol, chain extender, foaming agent, catalyst, foam equalizer, etc.; in the preparation process It mainly includes the following chemical reactions: polyol reacts with isocyanate to form a gel reaction of carbamate, and isocyanate reacts with water to form urea and CO 2 foaming reaction. Polyurethane materials have many excellent properties, such as good mechanical properties, wear resistance, oil resistance, tear resistance, chemical corrosion resistance, radiation resistance, adhesive properties and other excellent properties. [0003] Microcellular polyurethane elastomers cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32C08J9/08C08G101/00
Inventor 杨亚军李明英闫贺佳范春晓
Owner 洛阳凯众减震科技有限公司