Preparation method of halogen-free low-smoke and flame retardant cable

Abstract

Belonging to the field of electric power facilities, the invention discloses a preparation method of a halogen-free low-smoke and flame retardant cable. The cable includes a cable core and an insulating layer. The preparation method of the insulating layer comprises the steps of: (1) melt blending; (2) crosslinking; and (3) granulation pipe making. The cable insulating layer prepared from special components in proportion has excellent impact resistance, and at the same time has excellent flame retardance and low smoke performance, an oxygen index of more than 38 and flame retardance up to A level. The cable does not produce toxic gas or heavy metal after combustion, and is very environment-friendly. In addition, the cable also has excellent water blocking and moisture resistant performance.

Description

[0001] This application is a Chinese patent: Application number: 2014101720495; Invention name: Cable for construction; Application date: 2014.04.28 divisional application technical field [0002] The invention relates to the field of electric facilities, in particular to a halogen-free low-smoke flame-retardant cable. Background technique [0003] Construction cables generally refer to cables laid in buildings. Since buildings are often places where people live and gather, the requirements for safety are very important. For construction cables, the corresponding requirements are: first, it has strong strength, rigidity and crack resistance, because the service life of the building is generally required to be more than 50 years. If there is a problem with the cable during the service life of the building, it is very troublesome to replace it. ; Second, it is required to be flame-retardant, low-smoke and non-toxic. At present, fires in buildings are often caused by burning c...

AI Technical Summary

Problems solved by technology

For construction cables, the corresponding requirements are: first, it has strong strength, rigidity and crack resistance, because the service life of the building is generally required to be more than 50 years. If there is a problem with the cable during the service life of the building, it is very troublesome to replace it. ; Second, it is required to be flame-retardant, low-smoke and non-toxic. At present, fires in buildings are often caused by burning cables. During the burning of cables, a large amount of smoke is often produced, which brings difficulties to rescue and increases the mortality rate of fires. When burning, a large amount of poisonous gas is often produced, mainly halogen. For example, cables made of PVC and other materials have such shortcomings. Although cables made of PE materials are non-toxic and tasteless, they do not have flame retardancy; The performance of water, because the cable is composed of multi-strand conductors and multi-core cables, there must be a certain gap in the middle. Once water enters one end of the cable, due to the adsorption of the capillary, water vapor will permeate along the axial direction of the cable, which may cause the instrument to fail. Water, in order to make the cable have long-term stable performance, the cable used in a humid environment must have good water resistance and moisture resistance, and the cables used in construction are often in a humid environment