Oil-resistant low-smoke halogen-free flame-retardant flexible polyurethane cable material and preparation method thereof

Abstract

The invention discloses an oil-resistant low-smoke halogen-free flame-retardant flexible polyurethane cable material and a preparation method thereof. In the preparation method, polyol and polyisocyanate are applied to react, wherein the R value is controlled to be 2.05-2.45, and a polyurethane prepolymer with a certain molecular weight and isocyanate groups at the two ends is synthesized. The synthesized isocyanate-terminated polyurethane prepolymer is mixed with white carbon black, a flame retardant and a mineral filler, and functional inorganic particles, with polyurethane as a soft shell and filler as a hard core, are formed through a physical dispersion effect and a mechanical force chemical reaction. The hardness of the polyurethane cable material can be reduced, and the flexibilityand oil resistance of the polyurethane cable material are improved. According to the cable material, a multi-layer network structure is formed through irradiation crosslinking and secondary vulcanization processes, so that the mechanical property of the material is improved, and the size shrinkage rate of the material in the forming process is reduced. The cable material can be used for manufacturing insulation and sheaths of low-smoke halogen-free flame-retardant cables, flexible special cables, new energy automobiles and Chinese standard motor train unit lighting wires.

Description

technical field [0001] The invention belongs to the field of polymer functional modification science and polymer materials for cables, and relates to an oil-resistant, low-smoke, halogen-free, flame-retardant flexible polyurethane cable material and a preparation method thereof, in particular to a low-smoke, halogen-free, flame-retardant flexible polyurethane cable material that can be used to manufacture low-smoke, halogen-free, and flame-retardant materials. Cables, flexible special cables, new energy vehicles and Chinese standard EMU lighting cable insulation and sheath materials and their preparation methods. Background technique [0002] With the continuous improvement of the market's quality requirements for cable products, the domestic cable industry is accelerating product upgrading. Low-smoke, halogen-free and flame-retardant cables, flexible special cables, new energy vehicles and Chinese standard EMU lighting cables have stricter requirements on the performance of...

AI Technical Summary

Problems solved by technology

However, the research and development of this type of cable in my country is still in its infancy, and some core production technologies are monopolized by foreign countries, so that it is not yet possible to develop insulation and sheath materials that fully meet the above requirements at the same time.

[0003] Regarding the research and development of the above-mentioned special cables, some related invention patents have been disclosed so far, but the materials reported in these patents still cannot fully meet the requirements

Among them, the patent application publication No. CN 103214749 A prepared a thermoplastic polyurethane elastomer by compounding modified sulfonated polyethylene, maleic anhydride grafted polyolefin elastomer, thermoplastic polyurethane elastomer, flame retardant and other additives. Body cable material, the cable material can work at high temperature and has good flame retardancy and mechanical properties, but poor oil resistance

The patent application publication number is CN 102977585 A, by combining polar rubber such as chloroprene rubber and nitrile rubber with polyurethane thermoplastic elastomer, and introducing reinforcing filler and other additives into the system to prepare a polyurethane flame retardant Environmentally friendly cable material, the cable material has excellent flame retardant performance, and it has low smoke and non-toxicity during combustion, but its insulation performance is insufficient and it is easy to absorb moisture

The patent with application publication number CN 103467971 A invented a modified polyurethane cable material with high flame resistance and high weather resistance and its preparation method. The patent uses chlorinated polyethylene as a synergistic flame retardant to endow the material with excellent flame retardancy , but because the material contains halogens, it can be hazardous to the environment

In addition, there are some published related patents and materials reported in the literature that did not perform surface treatment on the filler during the preparation process, so that the mechanical properties of the material could not meet the index requirements, and the hardness was high, and the use was limited.

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