Method for preparing polyester-polyester blocked copolyester

Method for preparing polyester-polyester blocked copolyester

  • CN 102,516,517 A
  • Filed: 12/13/2011
  • Published: 06/27/2012
  • Est. Priority Date: 12/13/2011
  • Status: Active Application
First Claim
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1. a method for preparing the polyester-polyester blocked copolyester is divided into hard section of polyester and soft polyester section, and its system step is following:

  • (1) the hard section of aromatic polyester is synthetic;

    under the catalyst action;

    Aromatic dicarboxylic acid esters or aromatic acid and excess glycol are carried out transesterification reaction or esterification;

    Temperature of reaction is 190~

    220 ℃

    , and the reaction times is 2-4 hour, progressively reduces to pressure below the 200Pa;

    React reaction in 1-2 hour and obtain prepolymer P1, the number-average molecular weight scope is 500-10000g/mol;

    (2) soft section of aliphatic polyester is synthetic;

    under the catalyst action;

    Esterified derivative and aliphatic dihydroxy alcohol reaction with aliphatic dibasic acid or aliphatic dibasic acid;

    Temperature of reaction is 140~

    200 ℃

    ;

    Reaction times is 2-4 hour, progressively reduces to pressure below the 200Pa, reacts reaction in 1-2 hour and obtains prepolymer P2;

    Described prepolymer P2 also can be obtained by the caprolactone monomer ring-opening polymerization, and the number-average molecular weight scope is 500-10000g/mol;

    (3) aromatic polyester oligopolymer and the polycondensation of aliphatic poly ester oligomer;

    under mixing effect;

    Mix carboxylate P1 and carboxylate P2;

    Add oxidation inhibitor, catalyzer, passivator, chainextender, temperature of reaction 220-260 ℃

    , generate polyester-polyester type block polyester elastomerics;

    Catalyzer in step (1), the step (2) is titaniferous organism.

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