Preparation method and use for fluorine-containing microemulsion

摘要

A microemulsion consisting of water, peroxidic fluoropolyether carboxylate and oil is provided. When the microemulsion is used in homopolymerization, binary copolymerization or multi-component copolymerization of fluorine-containing olefin monomers, an emulsion with a low viscosity and a particle diameter of 30-200 nm can be obtained.

主权项

1. A microemulsion, characterized in that it comprises water, peroxidic fluoropolyether carboxylate and fluorinated alkane with carbon atoms of 5-20, wherein a weight ratio among said water, peroxidic fluoropolyether carboxylate and fluorinated alkane is x:y:z, wherein x is in the range of 95-105; y is in the range of 8-10; and z is in the range of 2-3; the average molecular weight of the peroxidic fluoropolyether carboxylate is 300-5000, and has the structure represented by the following formula (I):
A-O-(Gf-O)m(Gf-O—O)n—(CF2O)p—(CF2OO)q—(CF(CF3)O)r—B  (I) wherein Gf is —CF2CF(CF3)— or —CF(CF3)CF2—; A is —CF3, —COOM or —CF2COOM; B is —COOM or —CF2COOM; M is —H, —NH4 or alkali metal element; and m, n, p, q and r meet the following requirements: (1) m, n, p, q and r are integers not less than 1; (2) n+q≧2; (3) n+q≦m+p+r; and (4) m≧n+p+q+r.