EVA (Ethylene-Vinyl Acetate) modified PU (Polyurethane) shape memory vehicle bumper and preparation method thereof

An automobile bumper, polyurethane technology, applied in the field of automobile materials, can solve the problems of inability to realize the reuse of bumpers, low impact resistance, lack of recovery function, etc., to improve driving safety, absorb and mitigate external impact, and improve safety. Good results

Inactive Publication Date: 2019-03-01
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the automobile bumper materials in the prior art generally have disadvantages such as low impact resistance, poor safety performance, and poor elasticity, and lack of recovery function.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Spray paraffin wax on the surface of the inner cavity of the bumper mold, then place a metal skeleton in the mold to obtain a spare mold; then mix 44kg polyoxypropylene glycol, 1kg titanium tetrachloride, 2kg dioctyl sodium sulfosuccinate and 5kg urea Obtain A component, use 48kg isocyanate as B component, and then mix A component and B component at high speed to prepare the reaction injection raw material; then put 67kg reaction injection raw material into the storage tank of the high pressure injection machine, and simultaneously inject Mix ethylene propylene rubber and 16kg ethylene-vinyl acetate and put it into another storage tank, control the temperature in the two storage tanks at 59°C for hot mixing, and then put the materials in the two storage tanks at the same time at a pressure of 25MPa Inject into the mold cavity of the spare mold, release the mold after heat preservation and curing, take out the product, and finally irradiate and crosslink the surface of th...

Embodiment 2

[0035] Spray glycerin on the surface of the inner cavity of the bumper mould, then place a metal skeleton in the mould, and obtain a spare mould; Mix to obtain component A, use 51kg of isocyanate as component B, and then mix components A and B at high speed to prepare the raw material for reaction injection; then put 71kg of raw material for reaction injection into the storage tank of the high-pressure injection machine, and simultaneously inject 17kg EPDM rubber and 12kg of ethylene-vinyl acetate are mixed and put into another storage tank. The temperature in the two storage tanks is controlled at 58°C for thermal mixing, and then the materials in the two storage tanks are simultaneously heated at 20MPa. Pressure is injected into the mold cavity of the spare mold, demolded after heat preservation and curing, and the product is taken out. Finally, during the curing process, the surface of the product is irradiated and cross-linked with a particle accelerator. The radiation dose...

Embodiment 3

[0038] Spray vaseline on the surface of the bumper mold cavity, then place a metal skeleton in the mold to obtain a spare mold; then mix 48kg tetrahydrofuran-propylene oxide copolymer glycol, 2k vanadyl trichloride, 3kg sodium glycocholate and 5kg n-pentane To obtain component A, use 42kg of isocyanate as component B, and then mix components A and B at high speed to prepare the reaction injection raw material; then put 64kg of reaction injection raw material into the storage tank of the high-pressure injection machine, and simultaneously inject 18kg of three Mix ethylene propylene rubber and 18kg ethylene-vinyl acetate and put it into another storage tank. The temperature in the two storage tanks is controlled at 62°C for hot mixing, and then the materials in the two storage tanks are simultaneously heated at a pressure of 30MPa. Inject into the mold cavity of the spare mold, release the mold after heat preservation and curing, take out the product, and finally irradiate and cr...

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PUM

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Abstract

The invention belongs to the technical field of automobile materials, and provides an EVA (Ethylene-Vinyl Acetate) modified PU (Polyurethane) shape memory vehicle bumper and a preparation method thereof. The preparation method is characterized in that when polyether polyol and isocyanate are used as raw materials for carrying out chemical polymerization to prepare PU, the polyether polyol and isocyanate together with EPDM (Ethylene Propylene Diene Monomer) rubber and EVA are subjected to hot mixing and are commonly injected into a mold for placing a metal framework, and carrying out irradiation crosslinking during a curing process after taking out a product, thus obtaining the EVA modified PU shape memory vehicle bumper. Compared with a traditional method, the EVA modified PU shape memoryvehicle bumper prepared through the preparation method disclosed by the invention has the advantages that a shape memory function is given to a vehicle bumper through modification of EVA resin, the shape recovery rate is high, the shape memory property is excellent, excellent impact resistance, good elasticity and good safety are obtained, external impact force can be effectively absorbed and buffered, a vehicle body can be protected, and the vehicle driving safety can be remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of automobile materials and provides an EVA-modified polyurethane shape-memory automobile bumper and a preparation method thereof. Background technique [0002] Automobile bumper not only has a decorative function, but more importantly is a safety device that absorbs and eases external impact, protects the body and protects the body and occupants. Many years ago, the front and rear bumpers of cars were mainly made of metal materials. With the development of the automobile industry, automobile bumpers, as an important safety device, are also on the road of innovation. In modern society, in addition to maintaining the original protective function, the front and rear bumpers of cars also need to pursue harmony and unity with the shape of the car body, and pursue their own lightweight. Therefore, plastic bumpers have become the mainstream. [0003] Plastic bumpers mainly include polypropylene, polyethylene, pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/10C08J9/14C08L75/08C08L23/16C08L23/08
CPCC08J9/104C08J9/141C08J2203/04C08J2203/14C08J2375/08C08J2423/08C08J2423/16
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD
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