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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 improve the safety and comfort of products in continuous working environments, and provides a preparation method of low-deformation polyurethane shock-absorbing buffer blocks

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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Effect test

Embodiment 1

[0032] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare -NCO group content 25% diphenylmethane diisocyanate with a certain degree of crosslinking; ℃ for 120 minutes to form a prepolymer with a -NCO group content of 10%; the molecular weight is 2000 polyether polyol is heated to 100 degrees, and the mass fraction of polyether polyol with a molecular weight of 2000 is 5% and the molecular weight is 4000. Propylene oxide polyol, adding accounted for molecular weight is 2000 polyether polyol mass fractions and is 3% water foaming agent, tin dioctoate and DC193 to obtain chain extender; Wherein the mass ratio of water foaming agent, dioctoate and DC193 3:1:5; use a low-pressure foaming machine to mix the prepolymer and chain extender at a mass ratio of 100:80; quickly inject the prepared mixture into a 70°C vulcanizer, quickly close the mold, and vulcanize for 15 minutes , demoulding; place the poured sample in an oven at 100°C and vulcanize for 24 h...

Embodiment 2

[0035] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare -NCO group content 20% diphenylmethane diisocyanate with a certain degree of crosslinking; ℃ for 120 minutes to form a prepolymer with a -NCO group content of 8%; the molecular weight is 2200 polyether polyol is heated up to 100 degrees, and the mass fraction of 2200 polyether polyol is added and the molecular weight is 5000. Propylene oxide polyol, adding accounted for molecular weight is 2200 and the mass fraction of polyether polyol is 2.5% water blowing agent, triethylenediamine and 3042 to obtain chain extender; Wherein water blowing agent, triethylenediamine The mass ratio of 3042 and 3042 is 3:1:5; use a low-pressure foaming machine to mix the prepolymer and chain extender in a mass ratio of 100:90; the prepared mixed material is quickly injected into the 70°C vulcanizing machine, and quickly Close the mold, vulcanize for 15 minutes, and demould; place the poured sample in an oven at...

Embodiment 3

[0038] Excessive diphenylmethane diisocyanate (MDI) reacts with carbodiimide to prepare -NCO group content 26% diphenylmethane diisocyanate with a certain degree of crosslinking; ℃ for 60 minutes to form a prepolymer with a -NCO group content of 6%; the molecular weight is 1800 polyether polyol is heated up to 100 degrees, and the mass fraction of 1800 polyether polyol is added, and the molecular weight is 10000 trifunctional polyol Tetrahydrofuran polyol, adding accounted for molecular weight is 1800 the mass fraction of polyether polyol and is 3.5% water blowing agent, triethylenediamine and 3042 to obtain chain extender; Wherein water blowing 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 mixed material is quickly injected into the 40°C vulcanizer, and the mold is quickly closed , vulcanized for 30 minutes, and demolded; place the poured sampl...

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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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