5 results about "Interfacial polycondensation" patented technology

A method for producing α-amino acid poly(ester amides), poly(ester ureas), and copolymers thereof by interfacial polycondensation comprises the following steps: (a) preparing a first solution by mixing bis(α-amino acid)-, ω-alkylene diester di-p- toluenesulfonate salt, and anhydrous sodium carbonate in water; (b) preparing a second solution by dissolving an aliphatic dicarboxylic acid chloride, or triphosgene, or a mixture of triphosgene with aliphatic dicarboxylic acid chlorides and / or a mixture of triphosgene with aliphatic diisocyanates in methylene chloride; (c) cooling both the first and the second solutions; (d) adding the second solution to the first at a rate of 2350–2400 mL / min under stirring at 680–700 rpm; (e) adding 4.0–4.5 L of distilled water to the resulting reaction mixture in the reactor; (f) adding 10–12 L of distilled water to the polymer solution in the distillation / washing unit while simultaneously performing azeotropic distillation of methylene chloride and washing the polymer; and (g) drying the obtained polymer.

This invention discloses a method for preparing recycled polyarylate from waste polyester and polycarbonate. The recycling and reprocessing method includes the following steps: (1) Under a protective gas atmosphere, polyester and polycarbonate, along with a catalyst, are mixed uniformly in an alcohol solution, heated, and then catalytically alcoholyzed to obtain diester terephthalate and bisphenol A, respectively. (2) The diester terephthalate obtained from the alcoholysis of diester terephthalate is subjected to acyl chloride treatment to obtain the corresponding terephthaloyl chloride. (3) Finally, without separating the end-capping agent from the recycled monomers, terephthaloyl chloride and bisphenol A are co-polymerized and upgraded to polyarylate under mild conditions using interfacial polycondensation technology. This invention eliminates the need for additional purification techniques to remove the end-capping agent from the recycled monomers, simplifies the waste polymer recycling process, and achieves "upgraded recycling" of polyester and polycarbonate plastics, resulting in better economic benefits.