Flexible low-smoke halogen-free flame-retardant wire and cable material and preparation method thereof

Abstract

The invention belongs to the technical field of materials and discloses a flexible low-smoke halogen-free flame-retardant wire and cable material and a preparation method thereof. The wire and cable material is prepared by using the following raw materials in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 1 to 70 parts of polyethylene, 30 to 100 parts of flame retardant, 5 to 20 parts of smoke suppressor, 0.1 to 5 parts of coupling agent, 1 to 20 parts of plasticizer, 0.1 to 10 parts of crosslinking agent, 3 to 15 parts of lubricant and 0.1 to 1 part of antioxidant. The wire and cable material disclosed by the invention is a thermoplastic sulfurized elastomer material, can be used for preparing insulating layers and sheath layers of wires and cables, and has the characteristics that no halogen is contained, the flame-retardant effect is good, the smoking amount is low, the surfaces of the insulating layers and sheath layers are smooth and do not stick with one another, the flexibility is good, the mechanical strength is high, the wear resistance is good, the processing fluidity is good, the process is simple and the material can be recycled.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and relates to a thermoplastic vulcanized elastomer, in particular to a material for an insulating layer or a sheath layer of a flexible low-smoke halogen-free flame-retardant wire and cable and a preparation method thereof. Background technique [0002] Traditional wire and cable materials are mostly made of PVC and halogen-containing flame retardants, but halogen-containing flame-retardant materials will produce a large amount of toxic acid gas and high smoke density when burned, causing serious harm to human safety. In order to solve these problems, in recent years, people often use polymer matrix, flame retardant filler base and other additives to make low-smoke halogen-free flame-retardant wire and cable materials. In terms of matrix selection, one or more of polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), ethylene-propylene-diene rubber (EPDM), and ethylene-octene copoly...

AI Technical Summary

Problems solved by technology

These patents use hydroxide as the flame retardant system, the flame retardant mechanism of which is different from that of intumescent flame retardants, and the added red phosphorus is flammable and explosive, and will emit irritating gas during combustion, which cannot meet the requirements. The application of wire and cable materials is limited due to low-smoke, non-toxic and environmental protection requirements.

On the other hand, it is difficult to ensure the full mixing of materials and the refinement of elastomer particles by adopting dynamic vulcanization directly in the internal mixer, so it is difficult to ensure the uniformity of product performance, so it is difficult to meet the requirements of comprehensive performance of cable materials. Online Melt fracture is prone to occur during the cable covering process, resulting in problems such as rough surface of the cable, strong graininess, and poor mechanical properties.

Images