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Polyurethane microporous elastic body production method

A microcellular elastomer and polyurethane technology, applied in the field of polyurethane microcellular elastomer preparation, can solve the problems of high production and equipment costs, long in-mold time, poor product technology and material performance, and achieve fast curing and fluidity Good, optimize the effect of physical and mechanical properties

Inactive Publication Date: 2007-05-09
上海凯众聚氨酯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and propose a preparation method of polyurethane microporous elastomer to solve the problems of long time in the mold, poor product technology and material performance, and high production and equipment costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Polycaprolactone with a molecular weight of 2000 and diphenylmethane diisocyanate (MDI) were reacted at 80° C. for 2 hours to obtain an isocyanate-terminated prepolymer with an -NCO content of 20 wt %. The above-mentioned polyester polyol is mixed with diethylene glycol, water, retardation catalyst, and surfactant to form a resin mixture, wherein the amount of diethylene glycol is controlled to be 15 wt% of the polyester polyol amount. The catalyst uses a mixture of delayed tertiary amine SPF-2 and organotin DBTDL, wherein SPF-2 / DBTDL=1 / 0.1, and the total amount is 0.8wt% of the resin mixture.

[0016] Using a low-pressure foaming machine, mix the prepolymer and the resin mixture according to the ratio of the isocyanate index to 100%, inject the reaction liquid into the mold at 65°C, mature, and release the mold after 5 minutes. A high-strength damping microporous elastomer shock-absorbing block is obtained. The relevant process parameters and the physical properties o...

Embodiment 2

[0018] This example is the same as Example 1, except that: the catalyst uses a mixture of delayed tertiary amine SPF-2 and organotin DBTDL, SPF-2 / DBTDL=1 / 0.05, and the total amount is 1.2wt% of the resin mixture. The relevant process parameters and the physical parameters of the obtained microcellular elastomer are shown in the attached table.

Embodiment 3

[0020] The rest of this example is the same as Example 1, except that: the retarded tertiary amine SPF-2 is used as a catalyst, and the total amount is 1.6wt% of the resin mixture.

[0021] The process parameters of this embodiment and the physical parameters of the obtained microcellular elastomer are shown in the attached table.

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Abstract

A process for preparing the millipore polyurethane elastomer used for high-strength damping elements includes proportionally mixing prepolymer at 35-60 deg.C with polyol resin, adding delay alamine as catalyst, reaction, pouring in mould at 50-70 deg.C and ageing.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane microcellular elastomer, in particular to a preparation method of a polyurethane microcellular elastomer used as a damping element. 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 polyols, isocyanates, expansion agents, foaming agents, catalysts, additives, etc.; the preparation process mainly includes The following chemical reactions: polyol reacts with isocyanate to form urethane chain-gel reaction, isocyanate reacts with water to form urea and CO 2 - Foaming reaction. [0003] The technical improvement of polyurethane microcellular elastomers mainly focuses on two aspects: process performance improvement and material performance improvement. The improvement of process performance mainly includes: improving the fluidity of materials to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G18/72C08G18/32C08G18/24
Inventor 杨颖韬侯瑞宏李建星聂世波
Owner 上海凯众聚氨酯有限公司
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