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Preparation of polyurethane buffering stop block for sedan car

A polyurethane and stop block technology, which is applied in the field of preparation of polyurethane buffer blocks for cars, can solve the problems of short service life and poor weather resistance of polyurethane buffer blocks, and achieve the effects of improving weather resistance, good low temperature resistance and service life

Inactive Publication Date: 2009-07-01
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 technical problem to be solved by 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 defects of poor weather resistance and short service life of polyurethane buffer blocks for cars, especially to improve the product Excellent low temperature resistance, improve the service life of the product in low temperature natural areas

Method used

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  • Preparation of polyurethane buffering stop block for sedan car

Examples

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Embodiment 1

[0016] 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 a -NCO content of 20% (wt%). The above-mentioned polycaprolactone is mixed with diethylene glycol, water, a retardation catalyst, and a surfactant to form a resin mixture, wherein the amount of diethylene glycol is controlled to be 15% (wt%) of the polycaprolactone amount.

[0017] 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 material liquid into a mold at 65°C, mature it, and demould it after 5 minutes to prepare a buffer stop block for cars. The relevant product physical properties are shown in Table 1.

Embodiment 2

[0019] The difference between this example and Example 1 lies in that polytetrahydrofuran copolyether is used to replace polycaprolactone. The amount of diethylene glycol is 13% (wt%) of the amount of polytetrahydrofuran copolyether. The relevant physical parameters are shown in Table 1.

Embodiment 3

[0021] The difference between this embodiment and embodiment 1 is that polyether ester polyol is used instead of polycaprolactone. 1.4 The amount of butanediol is 18% (wt%) of the polyether ester polyol. The relevant physical parameters are shown in Table 1.

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Abstract

The invention discloses a method for preparing a polyurethane damping block for a sedan, and particularly relates to a method for preparing an optimized low-temperature resistant polyurethane damping stop block for a sedan. The method comprises the steps of preparing a prepolymer, preparing a polylol resin mixture, pouring and the like, so as to obtain the polyurethane damping stop block after curing. The polyurethane damping stop block prepared by the method has good low-temperature resistance, and has greatly prolonged service life in a low-temperature natural area.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane buffer block for cars, in particular to a method for preparing a polyurethane buffer stop block for cars with optimized low temperature resistance. 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 chains—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 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/10C08G101/00
Inventor 刘鸿慈杨颖韬
Owner 上海凯众聚氨酯有限公司