The invention provides a method for preparing poly(phenylene cyanide sulfide) resin. The method comprises the following steps of: pouring an alkali metal sulfide to a polar organic solvent; stirring in the atmosphere of an inert gas and adding phenyldihalide carbonitrile and lithium chloride; raising the temperature of a reaction system to the boiling point of the polar organic solvent; continuously stirring for 2 hours to 10 hours at the temperature of the boiling point; filtering the obtained products; alternately washing a solid obtained by filtering with boiling water and the organic solvent; and drying the solid. In the method for preparing the poly(phenylene cyanide sulfide) resin, raw materials are easy to obtain, the reaction conditions are easy to realize, the production process is easy to control, the reaction activity is high, and the high molecular weight poly(phenylene cyanide sulfide) resin can be stably obtained at atmospheric pressure and is suitable for large-scale industrial production. A product obtained by the method is especially suitable for various fields of aerospace, electronics, machinery, chemical engineering, and the like.

Method for preparing poly(phenylene cyanide sulfide) resin

PURPOSE:To improve heat resistance, moldability, mechanical characteristics, chem resistance etc, by reacting a dihalogeno-benzonitrile with a specified compd CONSTITUTION:The title resin with a reduced viscosity (measured in a soln of 02g/dl in concd sulfuric acid at 30 degC) of 01dl/g or larger and repeating units of the formula is obtd by reacting a dihalogenobenzonitrile (A) (eg 2,6- dichlorobenzonitrile) with an alkali metal sulfide (a) (eg sodium sulfide) and/or an alkali metal salt of trithicarbonate (b) obtd by reacting the component (a) with CS2 in an atomic ratio of the halogen atom of the component A to the alkali metal atom of the component (a) or (b) of 085-115:1 in an aprotic polar solvent (eg N-methyl-2-pyrrolidone), if necessary, in the presence of a catalyst and a reducing agent for 1-10hr

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Papers

Polysulfide resin and preparation thereof