Preparation method of low-smoke-density halogen-free flame retardant cable material

Abstract

The invention discloses a preparation method of a low-smoke-density halogen-free flame retardant cable material. The method comprises the following steps: after an inorganic flame retardant aluminum hydroxide is mixed with an antioxidant, a dispersant and other additives, and adding the obtained mixture and a certain amount of polyethylene resin into a single-screw extruder in proportion through different feeders, wherein the weight percentage of polyethylene is not more than 3%; after the added materials are fully mixed, carrying out granulating extrusion on the obtained mixture so as to prepare polyethylene coated aluminum hydroxide flame retardant particles; and adding the polyethylene coated aluminum hydroxide flame retardant particles, polyethylene, polyvinyl acetate and polypropylene resin into a twin-screw extruder in proportion through different feeders, and carrying out mixing and granulation on the obtained mixture so as to obtain the low-smoke-density halogen-free flame retardant cable material. The method disclosed by the invention is simple and effective, the prepared low-smoke-density halogen-free flame retardant cable material is good in flame retardant and mechanical properties, and after the low-smoke-density halogen-free flame retardant cable material is prepared into a cable, the cable can pass a wire smoke density test.

Description

technical field

[0001] The invention belongs to the field of cable material and its manufacture, and in particular relates to a preparation method of a cable material satisfying low smoke density and having good mechanical properties. Background technique

[0002] As people continue to pay attention to environmental health and sustainable development, the use of green materials to replace burning toxic polyvinyl chloride (PVC) materials has attracted more and more attention. In the field of wire and cable, a large number of halogen-free flame-retardant cable materials have been developed to meet the needs of different types of wires. However, in the European Union's wire and cable standard EN61034-2, wires also need to meet the requirements of low smoke density. Most of the flame retardants currently used, including phosphates, etc., and the resins used, such as polyester, polyphenylene ether, etc., have benzene rings in their molecular structures, which produce a lot of sm...

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