Preparation method and application of flame retardant DDSP

Abstract

The invention provides a preparation method and application of a flame retardant DDSP, a product is prepared from neopentyl glycol and thiophosphoryl chloride in the presence of acetonitrile as a solvent without using an acid-binding agent, and no by-product inorganic salt is generated in the process. The reaction needs to be carried out under the condition of introducing air or nitrogen so as to discharge hydrogen chloride gas generated in the reaction process. According to the reaction, the defects of environmental pressure generated by using a triethylamine or pyridine acid-binding agent due to relatively strong odor and harm to production operators due to relatively strong toxicity in the traditional process are avoided, the generation of inorganic salt is avoided, and the target compound is synthesized with relatively high yield by a relatively green and energy-saving method. The method has the advantages of short reaction time, simple operation steps, simple post-treatment and less pollution, and is easy for industrial production. According to the application, the compound can be used as a flame retardant intermediate to efficiently generate the flame retardant dithio pyrophosphate.

Description

technical field [0001] The invention belongs to the technical field of flame retardant, and particularly relates to a method for preparing DDSP without an acid binding agent and its application. Background technique [0002] Flame retardants are additives used to improve the flame resistance of materials, prevent materials from being ignited and inhibit the spread of flames. They are mainly used for flame retardant polymer materials. Currently available flame retardant elements are halogen, phosphorus, nitrogen, silicon, sulfur, boron and some metal elements such as antimony, magnesium, aluminum and so on. Most of the phosphorus-based flame retardants have the advantages of low smoke, non-toxicity, low halogen, and no halogen, which are in line with the development direction of flame retardants and have good development prospects. In particular, in 1986, a Swiss research institute discovered the dioxin problem of halogenated flame retardants, which prompted researchers to d...

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Problems solved by technology

[0005] Chinese Patent Publication No. CN102186870B uses 3-picoline as an acid-binding agent and a reaction solvent to prepare a flame retardant intermediate. This invention provides a simple method for preparing a flame retardant, which does not require different solvents and will not There is the formation of by-product inorganic salts. The disadvantage is that 3-picoline will release toxic nitrogen oxide fumes when heated, and there is a danger of explosion, which will cause danger to construction workers and users.

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