Oil-resistant and heat-resistant insulating material as well as preparation method and application thereof

Abstract

The invention discloses an oil-resistant and heat-resistant insulating material as well as a preparation method and application thereof. The insulating material is prepared from the following raw materials: a styrene elastomer, polyethylene and metallocene polyolefin, wherein the mass content of styrene in the styrene elastomer is 8-20%. According to the invention, the styrene elastomer with low styrene content and the polyethylene are blended as the base material, the styrene elastomer and the polyethylene can be cross-linked under irradiation, and the cross-linking degree is obviously increased compared with the prior art, so that the mechanical strength, heat resistance, aging resistance and other properties of the insulating material are improved. The metallocene polyolefin can effectively adjust the hardness of the system and improve the toughness of the finished product. The metallocene polyolefin is short in branch chain, small in quantity and not involved in cross-linking reaction, the toughness of a finished product can be improved, meanwhile, adverse effects on the cross-linking reaction are avoided, the insulating material does not need to be added with mineral oil plasticizers, and therefore the insulating material has the advantages of being high in mechanical strength, resistant to heat, oil, aging and cracking, low in hardness and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an oil-resistant and heat-resistant insulating material and a preparation method and application thereof. Background technique [0002] At present, most of the automotive wire insulation materials on the market are irradiated cross-linked polyethylene (XLPE). Although XLPE has the advantages of good insulation performance, high mechanical strength, heat resistance and crack resistance, and good processing performance, its hardness is too high. It is not easy to bend in some narrow spaces, which will affect the laying. There are also related technologies that use styrene-based thermoplastic elastomer (TPE) as insulating material. TPE has good mechanical strength and excellent anti-aging performance, and has the advantages of low hardness and easy laying. The temperature resistance level of cross-linked materials only reaches UL1581's 105°C, and it is difficult to meet t...

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Problems solved by technology

[0002] At present, most of the automotive wire insulation materials on the market are irradiated cross-linked polyethylene (XLPE). Although XLPE has the advantages of good insulation performance, high mechanical strength, heat resistance and crack resistance, and good processing performance, its hardness is too high. It is not easy to bend in some narrow spaces, which will affect the laying

There are also related technologies that use styrene-based thermoplastic elastomer (TPE) as insulating material. TPE has good mechanical strength and excellent anti-aging performance, and has the advantages of low hardness and easy laying. The temperature resistance level of cross-linked materials only reaches 105°C of UL1581, and it is difficult to meet the temperature resistance requirements of 125°C or higher, and non-cross-linked materials are prone to cracking of wire rods under high temperature and stress

Another related technology uses polyethylene and SEBS to blend and then irradiates. Although polyethylene is easy to cross-link, the styrene of SEBS is not easy to cross-link, and mineral oil, such as white mineral oil, must be used for plasticization. The use of mineral oil Components that affect the cross-linking reaction will be introduced, and the mineral oil itself will have a very bad impact on the material in terms of chemical resistance and heat resistance. At the same time, it will also change the Shore hardness of the product, and the oil resistance is poor Poor, not conducive to vehicle environment applications

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