High flame-retardant and high heat-resisting halogen-free expansion type fire-resistant cable material and preparation method thereof

Abstract

The invention relates to a high flame-retardant and high heat-resisting halogen-free expansion type fire-resistant cable material and a preparation method thereof. In order to solve the problem that the cable material is separated out when encountering water during processing and improve the mechanical property, the cable material adopts a polyolefin material as a matrix and also adopts an expansion-type flame retardant. The cable material comprises the following components in part by weight: 100 parts of matrix resin, 60 to 80 parts of flame retardant, 2 parts of lubricant and 1 part of antioxidant, wherein the matrix resin comprises SEBS, ethylene-vinyl acetate copolymer, ethylene-propylene-butylene terpolymer, polypropylene, high-density polyethylene and ethylene-octylene copolymer; and the flame retardant comprises ammonium polyphosphate II type, pentaerythritol and melamine. The preparation method comprises the following steps of: uniformly mixing the components on a double-roll open mill at the roll temperature of 190+ / -5DEG C for 30+ / -5minutes; and then tabletting, cold-pressing and demoulding on a flat vulcanizing press at the temperature of 190+ / -5DEG C. The cable material has the advantages of high flame retardant property, tensile strength reaching to 12 to 16MPa and the ratio of breaking elongation reaching to 400 to 500 percent; and at the same time, the problem that the material is separated out when encountering the water is improved.

Description

Technical field: The invention relates to a flame-retardant cable sheathing material and an insulating material with polyolefin as a matrix resin, in particular to a formulation of a halogen-free flame-retardant cable material. Background technique: With the development of wire and cable technology, high performance, environmental protection, and flame retardancy are the development direction of wire and cable materials. Following the RoHS directive and WEEE directive, the European Union has launched the EuP directive, namely the "Ecological Design of Energy-Using Products Directive". It is the third environmental protection directive for electronic and electrical products. According to the directive, specific implementation rules for related products were successively launched from 2007 to 2010. The EuP directive requires that certain harmful substances including halogens be prohibited for wire and cable products entering the EU market. This requires that the green manufact...

AI Technical Summary

Problems solved by technology

However, it cannot meet the requirements of high-performance cables in some aspects, and there are mainly two shortcomings: (1) The intumescent flame retardant has its fatal shortcomings, which are easy to absorb moisture and cause severe precipitation when it meets water.

It becomes sticky when it encounters water during processing, and the appearance is not good

And the problem of water precipitation is very difficult to solve; (2) The addition of intumescent flame retardants to the cable material greatly reduces the mechanical properties of the material, especially the tensile strength, which is usually difficult to exceed 12MPa