Method for preparing low-deformation polyurethane damping bumper block

A polyurethane and low-deformation technology, applied in the field of polymer material preparation, can solve the problem of high deformation rate, achieve the effect of reducing deformation rate, meeting requirements, and increasing chemical crosslinking

Active Publication Date: 2015-02-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the technical problem of high deformation rate after dynamic fatigue of polyurethane buffer blocks for automobiles in the prior art to im

Method used

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  • Method for preparing low-deformation polyurethane damping bumper block
  • Method for preparing low-deformation polyurethane damping bumper block

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare diphenylmethane diisocyanate with a certain degree of crosslinking with 25% NCO group content; combine it with dehydrated polytetrahydrofuran polyol at 70 React at ℃ for 120 minutes to form a prepolymer with a content of 10% of the NCO group; heat the polyether polyol with a molecular weight of 2000 to 100 degrees, and add 5% of the polyether polyol with a molecular weight of 2000 to a trifunctional polyol with a molecular weight of 4000 Propylene oxide polyol, adding 3% water foaming agent, tin dioctanoate and DC193 with a molecular weight of 2000 polyether polyol to obtain a chain extender; the mass ratio of water foaming agent, tin dioctanoate and DC193 3:1:5; use a low-pressure foaming machine to mix the prepolymer and the chain extender at a mass ratio of 100:80; the prepared mixture is quickly injected into the 70°C vulcanizer, and the mold is quickly closed and vulcan...

Example Embodiment

[0034] Example 2

[0035] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare diphenylmethane diisocyanate with a certain degree of crosslinking with a NCO content of 20%; it is combined with dehydrated polytetrahydrofuran polyol at 70% React at ℃ for 120 minutes to form a prepolymer with a NCO content of 8%; heat the polyether polyol with a molecular weight of 2200 to 100 degrees, and add a mass fraction of the polyether polyol with a molecular weight of 2200 to 7.65% and a molecular weight of 5000 trifunctional polyol Propylene oxide polyol, adding 2.5% water foaming agent, triethylene diamine and 3042 with a molecular weight of 2200 polyether polyol to obtain a chain extender; of which water foaming agent, triethylene diamine The mass ratio with 3042 is 3:1:5; the low-pressure foaming machine is used to mix the prepolymer and the chain extender at a mass ratio of 100:90; the prepared mixture is quickly injected into the 70℃ vulcanizing machine, qui...

Example Embodiment

[0037] Example 3

[0038] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare diphenylmethane diisocyanate with a certain degree of cross-linking with 26% NCO group content; combine it with dehydrated polytetrahydrofuran polyol at 80 React at ℃ for 60 minutes to form a prepolymer with a content of -NCO group of 6%; heat the polyether polyol with a molecular weight of 1800 to 100 degrees, and add a mass fraction of the polyether polyol with a molecular weight of 1800 to 10% and a molecular weight of 10000 trifunctional polyol Tetrahydrofuran polyol, adding 3.5% water foaming agent, triethylenediamine and 3042 with a molecular weight of 1800 polyether polyol to obtain a chain extender; of which water foaming agent, triethylenediamine and 3042 The mass ratio is 3:1:5; use a low-pressure foaming machine to mix the prepolymer and the chain extender at a mass ratio of 100:80; the prepared mixture is quickly injected into the 40℃ vulcanizing machine, and the...

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Abstract

The invention relates to a method for preparing a low-deformation polyurethane damping bumper block. The method is used for solving the technical problem in the prior art that the deformation rate is high after the polyurethane bumper block for an automobile is subjected to dynamic fatigue, and is used for improving the safety and comfort of the bumper block in a continuous working environment. The method comprises the processing steps: (1) pretreating isocyanate; (2) preparing a prepolymer; (3) preparing a chain extender; (4) blending; (5) carrying out cast molding; (6) carrying out post-vulcanization. The prepared low-deformation polyurethane damping bumper block has the advantage that the deformation rate of the fatigued bumper block is lowered on the premise that the dynamic fatigue performance and comprehensive performance of the bumper block are maintained. According to the method disclosed by the invention, modified MDI and macromolecular and polyfunctional ether polyalcohol are adopted to react, and a microporous elastomer material, of which both hard segment phase and soft segment phase contain certain chemical crosslinking, is prepared, so that the requirements of current medium- and high-end automobiles on bumper blocks which have low deformation after dynamic fatigue are met.

Description

technical field [0001] The invention relates to the field of polymer material preparation, in particular to a method for preparing an MDI-type, low-deformation polyurethane shock-absorbing buffer block cross-linked with both hard and soft phases. Background technique [0002] Due to the excellent dynamic and static mechanical properties of polyurethane microcellular elastomers, it is especially suitable for use as shock absorbing buffer materials for automobiles. Its main raw materials mainly include polyols, isocyanates, catalysts, foaming agents, foam stabilizers, etc.; The preparation process mainly includes the steps of prepolymer preparation, material mixing, injection molding and post-annealing; its main chemical reaction includes gel reaction, that is, the reaction of hydroxyl and isocyanate to form carbamate; foaming reaction: water foaming agent The process of reacting with isocyanate to form allophanate and carbon dioxide. [0003] Chinese patent zl200710094632.9 ...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/48C08G18/10C08J9/08C08G101/00
CPCC08G18/10C08G18/4812C08G18/4854C08G18/78C08G2110/0083C08G18/48
Inventor 王杰郇彦周宇飞杨小牛滕腾张明远黄忆南陈丽萍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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