Rubber foam material and manufacturing method thereof

A rubber and foam technology, applied in the field of rubber foam material preparation, can solve the problems of few rubber foam materials with high thermal conductivity and high compression, uneven foam cells, and high production costs, so as to shorten the pre-vulcanization time, Ease of operation and reduced heat impact

Inactive Publication Date: 2015-12-23
LOVEPAC CONVERTING BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are few high thermal conductivity and high compression rubber foam materials
According to reports, there are high thermal conductivity foam thermal interface materials made by mixing graphite / graphene and foaming materials, but the internal cells of the foam are uneven, the foaming rate is low, and the thermal conductivity is low. , has the disadvantages of difficult control, high production cost, and difficult molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation methods used in the following examples are conventional methods unless otherwise specified.

[0026] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0027] The basic process of the preparation method of the rubber foam material of the present invention is as follows: the raw materials are rubber base material, heat-conducting filler, radiation cross-linking sensitizer, anti-aging system, plasticizer, vulcanization system and foaming system, through mixing, After cutting the pieces and pretreatment with gamma ray radiation, vulcanize and foam, and release the mold to make the rubber foam material claimed in the present invention.

Embodiment 1

[0029] Raw materials: 100 parts of EPDM rubber as the rubber substrate; 150 parts of graphene and 80 parts of alumina as thermal conductive filler; 3 parts of trimethylolpropane triacrylate as radiation cross-linking sensitizer; 2 parts of anti-aging system, 3 parts of 2,4-trimethyl-1,2-dihydroquinoline polymer; 60 parts of paraffin oil as plasticizer; 1 part of sulfur, 8 parts of vulcanization activator zinc oxide, dimethyl vulcanization accelerator 1 part of zinc dithiocarbamate; the foaming system uses 4 parts of foaming agent azodicarbonamide and 2 parts of foaming aid urea.

[0030] The raw film is made after mixing and cutting the raw materials; then use 60 Co radiated γ-rays were used to irradiate and cross-link the cut raw film, the irradiation dose was 100 kGy, and the irradiation temperature was 23°C. The purpose of irradiation cross-linking treatment is to make the raw film after radiation pretreatment have a certain degree of pre-cross-linking, for example, 30% pr...

Embodiment 2

[0036] The method of this example is the same as that of Example 1, except that: in this example, 2 parts of pentaerythritol triacrylate is used as the radiation cross-linking sensitizer; the radiation dose of gamma rays is 50 kGy. The high thermal conductivity and high compressibility rubber foam material prepared in this example has a thermal conductivity of 14 W / (m·K) and a compressibility of 55%.

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Abstract

The invention discloses a rubber foam material and a manufacturing method thereof. A rubber base material, a heat conducting filler, a radiation crosslinking sensitizing agent, an anti-aging system, a plasticizer, a vulcanization system and a foaming system are used as raw materials, mixing, piece cutting and gamma ray radiation preprocessing are performed, and then vulcanization, foaming and mold stripping are performed to obtain the rubber foam material. According to the preparation method, a film preprocessed by gamma ray radiation preprocessing has the certain pre-crosslinking degree before heat vulcanization foaming is started, the vulcanization speed and the foaming speed can be matched, and the problems that foam holes are not uniform, the foaming rate is low and the heat conductivity coefficient is low are solved. The obtained rubber foam material has excellent properties of uniform foam holes, the high foaming rate, the high heat conductivity coefficient, the high compression rate, the high rebound resilience, the low weight, good insulation, damping, sound absorption and the like, the technology is simple, operation is convenient, the prevulcanization time is shortened, and the rubber foam material can be widely applied to a heat conducting gap interface material of an electronic product.

Description

technical field [0001] The invention relates to a rubber foam material and a preparation method thereof, belonging to the technical field of rubber foam material preparation. Background technique [0002] Heat conduction has always been an important process in the electronics industry, and the operating temperature of components is often an important basis for reliability. In particular, the assembly of microelectronics is becoming more and more intensive, and its working environment is rapidly changing to high temperature. According to the data, the reliability of electronic components decreases by 10% every time the temperature rises by 2°C, and the service life at 50°C is only 1 / 6 of that at 25°C. The improvement of thermal conductivity is usually accompanied by the optimization of heat dissipation performance. Therefore, more and more attention has been paid to the thermal gap interface material, which has high thermal conductivity, good elasticity, electrical insulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/04C08L23/16C08L91/06C08K13/02C08K3/04C08K3/38C08K3/22C08K5/3437C08K5/39C08J9/10C08J3/28C08J3/24
Inventor 郑艳红张天旭王皓刘丽梅任全占张文娟程文星逯平邓毅
Owner LOVEPAC CONVERTING BEIJING
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