Bifunctional modified flame-retardant isocyanate compound and synthesis method thereof

Abstract

The invention relates to a bifunctional modified flame-retardant isocyanate compound and a synthesis method thereof, and belongs to the technical field of polyurethane materials. According to the invention, phosphorus-containing dihydric alcohol synthesized by using 2-carboxyethyl phenyl hypophosphorous acid, ethylene glycol and epoxypropane as raw materials and TDI are polymerized to obtain a bifunctional modified flame-retardant isocyanate compound. The flame-retardant isocyanate compound is a modified flame-retardant isocyanate compound containing an element P, does not contain halogen, and can greatly improve the flame retardance of polyurethane foam without reducing the environmental protection index of the foam. The modified flame-retardant isocyanate compound developed by the invention does not contain halogen, is small in combustion smoke amount, does not release corrosive or irritant halogen hydride gas, does not generate toxic cancerogenic substances such as polybrominated benzoxins and polybrominated dibenzofuran, does not contain environmental hormone substances such as halogen organic substances, and is environment-friendly and environment-friendly. The long-term influence of the material on the environment is avoided.

Description

technical field [0001] The invention relates to a difunctionality-modified flame-retardant isocyanate compound and a synthesis method thereof, belonging to the technical field of polyurethane materials. Background technique [0002] The total annual output of polyurethane in the world is about 20 million tons, and my country's output accounts for about 55% of the world's output. The most widely used and used products are foam products, accounting for about 40% of the share. The largest amount of polyurethane foam products are soft sponges for mattresses, sofas, car seats, etc., and rigid foams for building insulation in refrigerators, cold storage, and residential buildings. Many applications require polyurethane foam to have good resistance. It has good odor, TVOC and other environmental performance while burning ability. [0003] On the one hand, flame retardancy has become a bottleneck problem for the use of polyurethane foam in cold storage, passenger trains, public hom...

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Problems solved by technology

[0005] 1. Adding phosphorus or halogen liquid flame retardants to the polyol component has problems such as strong plasticizing effect and migration of flame retardants;

[0006] 2. The development of polyols with flame retardant elements such as phosphorus, nitrogen, and halogen has the problems of poor physical properties, unsatisfactory flame retardant effect, and high cost;

[0018] It can be seen from the above-mentioned published related documents that there is no related report on the improvement of flame retardancy by modifying isocyanate while avoiding flame retardants to reduce the environmental protection index of polyurethane foam.

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