Heat-conducting rubber

Abstract

The invention relates to heat-conducting rubber. The heat-conducting rubber comprises the following components in parts by weight: 75-90 parts of butyl rubber, 10-25 parts of chloroprene rubber, 20-60 parts of carbon black, 5-30 parts of heat-conducting filler, 3-10 parts of zinc oxide, 1-3 parts of stearic acid, 3-10 parts of plasticizer and 5-15 parts of vulcanized resin. The heat-conducting rubber has the beneficial effects that the prepared heat-conducting rubber has good heat-conducting property and mechanical property, and can meet the requirements of rubber products.

Description

Technical Field

[0001] This invention belongs to the field of rubber, and specifically relates to a thermally conductive rubber. Background Technology

[0002] Polymer materials have relatively poor thermal conductivity, and their performance needs to be improved to enable their application in more fields. Currently, there are two main approaches to improving the thermal conductivity of polymer materials: one is to prepare structural thermally conductive polymer materials with good thermal conductivity, such as materials with conjugated structures like polyacetylene, or to improve the crystallinity of the polymer to achieve thermal conductivity through the phonon thermal conduction mechanism; the other is to prepare filled thermally conductive polymer composite materials by adding fillers with high thermal conductivity to the matrix, which is the more widely used method.

[0003] Currently, common high thermal conductivity fillers mainly include metal fillers, oxide fillers, and carbon-based fillers. Among them, metal fillers such as silver, copper, and aluminum have excellent thermal conductivity, but they are dense and expensive. Oxide fillers such as alumina and aluminum nitride, and carbon-based fillers such as graphite, carbon nanotubes, and graphene have good thermal conductivity and are widely used. Since the particle size of the thermally conductive filler powder has a significant impact on the thermal conductivity of composite materials, smaller particle sizes are more beneficial to improving the thermal conductivity of the composite material. However, in practical applications, smaller particle sizes of fillers may cause them to agglomerate in the polymer material, affecting the processing and mechanical properties of the thermally conductive rubber, and making it difficult to obtain ideal thermal conductivity.

[0004] The purpose of this invention is to solve the problems of poor processing performance, decreased mechanical properties, and low thermal conductivity caused by the high filler content of existing thermally conductive rubber fillers. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a thermally conductive rubber with good thermal conductivity and mechanical properties.

[0006] A thermally conductive rubber comprising the following components in parts by weight:

[0007] The thermally conductive filler is one or a combination of two or more of acetylene black, graphene, graphite, carbon nanotubes, alumina, aluminum nitride, silicon nitride, and boron nitride.

[0008] The thermally conductive filler is a silane coupling agent modified filler. The better the dispersion of the thermally conductive filler in the polymer matrix, the more complete the thermally conductive network formed, and the better the thermal conductivity of the composite material. Thermally conductive fillers are prepared by coating silane coupling agents such as KH560, KH570, KH171, and Si-902 onto the surface of filler particles through electrostatic adsorption or spraying. This process imparts excellent hydrophobicity to the filler surface, improves the interaction and compatibility between the filler and the polymer matrix, significantly enhances its dispersibility, and prevents its aggregation and accumulation in the polymer matrix, thereby improving the thermal conductivity, processability, and mechanical properties of the composite material.

[0009] The plasticizer is one or a combination of two or more of castor oil, naphthenic oil, and environmentally friendly aromatic oil.

[0010] The beneficial effect of this invention is that the thermally conductive rubber prepared using the above formula has good thermal conductivity and mechanical properties, which can meet the requirements of rubber products. Detailed Implementation

[0011] The specific embodiments of the present invention will be further described in detail below with reference to the examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions.

[0012] Comparative Example Table 1 Comparative Formulas Material Name weight Butyl rubber 90 Chloroprene rubber 10 Carbon Black N330 60 Zinc oxide 5 stearic acid 1 Environmentally friendly aromatic oil 8 Vulcanized resin 10

[0013] Example 1 Table 2 Formulation of Example 1 Material Name weight Butyl rubber 90 Chloroprene rubber 10 Carbon Black N115 35 Acetylene black 10 graphite 15 Zinc oxide 5 stearic acid 1 Environmentally friendly aromatic oil 8 Vulcanized resin 10

[0014] Example 2 Table 3 Formulation of Example 2 Material Name weight Butyl rubber 90 Chloroprene rubber 10 Carbon Black N330 45 silicon nitride 10 graphite 15 Zinc oxide 5 stearic acid 1 Environmentally friendly aromatic oil 8 Vulcanized resin 10

[0015] Example 3 Table 4 Formulation of Example 3 Material Name weight Butyl rubber 90 Chloroprene rubber 10 Carbon black N234 45 Aluminum nitride 5 graphite 15 Zinc oxide 5 stearic acid 1 Environmentally friendly aromatic oil 8 Vulcanized resin 10

[0016] Table 5 Properties of vulcanized rubber

Claims

1. A thermally conductive rubber, characterized in that, The thermally conductive rubber comprises the following components in parts by weight: Butyl rubber 75-90 Chloroprene rubber 10-25 Carbon black 20-60 Thermally conductive filler 5-30 Zinc oxide 3-10 Stearic acid 1-3 Plasticizer 3-10 Vulcanized resin 5-15; The thermally conductive filler is one or a combination of two or more of acetylene black, graphene, graphite, carbon nanotubes, alumina, aluminum nitride, silicon nitride, and boron nitride.

2. The thermally conductive rubber according to claim 1, characterized in that: The thermally conductive filler is a silane coupling agent modified filler.

3. The thermally conductive rubber according to claim 1, characterized in that: The plasticizer is one or a combination of two or more of castor oil, naphthenic oil, and environmentally friendly aromatic oil.

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