Preparation method of elastic rubber tube with heat insulating and expanding layer

Abstract

The invention discloses a preparation method of an elastic rubber tube with a heat insulating and expanding layer, and belongs to the technical field of rubber tubes. According to the preparation method disclosed by the invention, the heat conduction coefficient of expandable graphite is relatively large, so that in the heat transfer process, the surfaces of fireproof materials are quickly heated,the expanded graphite can be slightly expanded, and is converted from a crimping condition to an expanding condition, and the heat dissipation area of the of a heat insulating and fireproof layer isenlarged; PVC rubber is used as a main raw material, so that a modified aluminum silicate fiber layer for coating an inner rubber tube layer is obtained, damages generated when the inner rubber tube layer is bent are reduced; the main raw material of the PVC inner rubber tube layer is polyvinyl chloride; the polyvinyl chloride is subjected to mechanical modifying with EPDM virgin rubber; epoxy soybean oil used as an additive has favorable heat resistance and favorable flexibility at low temperature, so that the epoxy soybean oil is especially suitable for being used as a plastifier in the PVCinner rubber tube layer, active chlorine atoms on chains of the polyvinyl chloride can be stable, the hydrogen chloride generated by optothermal degrading can be quickly absorbed, and continuous degrading of the polyvinyl chloride is blocked; and therefore, the ageing resistance of the PVC inner rubber tube layer is improved.

Description

technical field [0001] The invention discloses a preparation method of an elastic rubber hose with a thermal insulation expansion layer, which belongs to the technical field of rubber hoses. Background technique [0002] Hose is a type of tubular rubber product used to transport gas, liquid, slurry or granular materials. The hose structure is usually divided into: inner rubber layer, outer rubber layer and skeleton layer (or middle layer). The inner rubber layer directly bears the abrasion and erosion of the conveying medium; the outer rubber layer protects the inner body of the rubber hose from damage and erosion of the external environment; the skeleton layer is the pressure-bearing layer of the rubber hose, giving the hose body strength and rigidity. The working pressure of the hose depends on the material and structure of the skeleton layer. The material of the skeleton layer can be cotton fiber, various synthetic fibers, carbon fiber or asbestos, steel wire and the li...

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is that at present, rubber hoses are generally poor in heat resistance and flame retardancy, and fire-resistant casings are usually added, but the thickness of the casing is constant and cannot be expanded, the heat insulation effect is limited, and the PVC rubber hose has poor elasticity and is easy to age. Defects, a preparation method for an elastic hose with a heat-insulating expansion layer is provided