| abstract |
In a method of synthesizing a polyglycerol sulfide resin, a solution of sodium hydrogen sulfide and p-dichlorobenzene as a raw material, N-methyl-2-pyrrolidone as a solvent, C5 to C6 C5 to C6 fatty acid salts formed when dehydration of fatty acids together with sodium hydroxide are used as a polycondensation reaction aid, and synthesized by polycondensation reaction. The reaction liquid was subjected to acid treatment and washing to obtain a white PPS resin. The product melt index was less than 125 g / 10 min. The GPC measurement had a weight average molecular weight of more than 4.2 X 10 4 , a whiteness degree of more than 90, Meets the criteria; The C5 to C6 fatty acid salt employed in the method of the present invention has good solubility in NMP and can further promote the polycondensation reaction; After the reaction and filtration, all of the filtrate is subjected to a hydrochloric acid treatment to become a free fatty acid again; Since the C5 to C6 fatty acids form an azeotropic mixture with water and have low solubility in water, the C5 to C6 fatty acids can be recovered in the filtrate through an azeotropic method with water, so that the auxiliary agent and sodium chloride are both dissolved in water, It solves a problem that can not be solved. |