Process for preparing low-smoke non-toxic heat-resistant cable material

Abstract

The invention provides a process for preparing a low-smoke non-toxic heat-resistant cable material. The method comprises the following steps: mixing ethylene vinyl acetate copolymer EVA, vinyl-vinyl acetate-carbon monoxide terpolymer and copolymer of polyethylene and polyethylene grafted maleic anhydride, which are metered in a formula weight ratio, in a high-speed mixer at a high speed for 30 seconds, and mixing, plasticizing and granulating with a twin-screw granulator; and adding carbon black, an aluminum hydroxide flame retardant, a magnesium hydroxide flame retardant, a silane coupling agent, crosslinking sensitizertrimethallyl isocyanurate TMAIC prepolymer, an antioxidant 1010, an antioxidant DLTP, silicone master batches and a lubricating agent in a high-speed mixer in a formula weight ratio for 30 seconds, and kneading, plasticizing and granulating in a dual-band extruder. According to the preparation process, the defects of sticking, agglomeration and the like of high-VA-content EVM in the production process can be overcome, favorable heat resistance and low temperature performance can be maintained, and the processing difficulty and processing cost for radiation can be greatly reduced.

Description

technical field [0001] The invention relates to the field of flame-retardant cable materials, in particular to a preparation process for low-smoke, non-toxic and heat-resistant cable materials. Background technique [0002] Due to the particularity of the use environment, special cables are required to have oil resistance, mud resistance, high temperature resistance, low temperature resistance, wear resistance, high mechanical strength, halogen-free, low smoke and other properties. For cables used in oil platforms, more stringent requirements for oil resistance and sludge resistance have always been the main research problems in the cable industry. [0003] At present, there are not only few manufacturers of special cables for oil platforms in China, but also very few manufacturers with the production capacity of mud-resistant sheath materials, and they are very unstable in mud-resistant performance, so cables and materials mainly rely on imports. [0004] Most of the domes...

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Problems solved by technology

[0005] Among the published mud-resistant cable material patents, the patent with application number 201310013029.9 discloses a power cable material for oil platforms and its preparation method, which uses hydrogenated nitrile as the matrix resin, and is wear-resistant, tear-resistant, oil-resistant, ozone-resistant, and oil-resistant. Mud, high flame retardancy and other properties, and meet the requirements of the Norwegian standard NEK606 for mud resistance, but it has the problems of high cost and large amount of smoke when burning, which is not conducive to popularization and application

[0006] The patent with the application number 201110359891.6 discloses a cable sheath material for offshore platforms and its preparation method. It uses ethylene-vinyl acetate rubber EVM as the base material, and acrylate rubber (ACM) and hydrogenated nitrile rubber with better oil resistance. Rubber (HNBR) and fluororubber (FKM) are blended and vulcanized by a peroxide crosslinking system, which has good mechanical properties, flame retardancy, and sludge resistance, but also has the problems of high cost and large amount of smoke when burned , and the use of peroxide cross-linking system for vulcanization requires special extrusion equipment and huge special cross-linking pipelines. The equipment investment is large, the process is cumbersome, and the cost is high

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