DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) derivative grafted siloxane flame retardant reaction type cable material and preparation method thereof

Abstract

The invention discloses a DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) derivative grafted siloxane flame retardant reaction type cable material, which is prepared through the steps that firstly, KH-570-TiO2 particles are successfully synthesized by a sol-gel combined hydrothermal method; vinyl groups are introduced on the surfaces of the nanometer titania particles; ethenyltrimethoxysilan is used as a raw material to take a hydrolytic polycondensation reaction to prepare octavinyl polyhedral oligomeric silsesquioxane; the octavinyl polyhedral oligomeric silsesquioxane and DOPO take a nucleophilic addition reaction; an obtained DOPO derivative is used as a reaction type flame retardant; then, the flame retardant and nanometer TiO2 with double bonds are grafted on a polyethylene molecular chain by using peroxide as an initiator to obtain grafted aggregates; then, cross-linking reaction is performed in hot water to obtain the cable material. The reaction type flame retardant is connected with a polymer matrix through chemical bonds, so that the problem of compatibility is avoided; the influence on the mechanical property of the cable material is little; in addition, the flame retardant effect is durable.

Description

technical field [0001] The invention relates to the field of polyethylene materials, in particular to a DOPO derivative grafted siloxane flame-retardant reactive cable material and a preparation method thereof. Background technique [0002] Polyethylene has excellent electrical insulation, low temperature resistance, easy molding processability and sufficient mechanical strength, etc. It is a good electrical insulation material and has been widely used as the main material for wire, cable insulation and sheathing materials. raw material. However, due to its low operating temperature and poor short-circuit resistance, it is not suitable for use in fields such as wires with high heat generation and power cables above 1kV, and its market has been greatly restricted. After a long period of exploration and research, a method for cross-linking and modifying polyethylene has been found, and a silane cross-linked polyethylene (SXPE) wire and cable insulation material with excellent...

AI Technical Summary

Problems solved by technology

[0005] The flame retardant modification of polyethylene mainly starts with the addition of flame retardants. From the perspective of the preparation process of silane crosslinked polyethylene, the addition of flame retardants may affect the silane crosslinking. It is possible to cause the added flame retardant to precipitate out and fail