Preparation of hyperbranched polymer and hyperbranched epoxy resin

Abstract

The invention relates to a preparation method for a hyperbranched epoxy resin. The preparation method comprises the following steps: (1) preparing a hyperbranched polymer with a functional end group; (2) carrying out the reaction of the hyperbranched polymer and chloroepoxy propane under the action of a ring opening catalyst to obtain an addition product; and (3) carrying out the ring closing reaction of the obtained addition product in an organic solvent and under the reaction of a basic catalyst to generate the hyperbranched epoxy resin, wherein the hyperbranched polymer is prepared under the action of the catalyst through the reaction of a first monomer and a second. Polybasic amine, polyol or the mixture thereof is taken as the first monomer; polyatomic acid, anhydride or the mixture thereof is taken as the second monomer; the dosage mol ratio of the first monomer to the second monomer is 1:0.3 to 2.5; and the first monomer at least comprises a heat resistant six-membered compound which is more than or equal to 1 percent of the total mol number of the first monomer. The prepared hyperbranched epoxy resin has low viscosity, high heat resistance, and the reinforcing and plasticizing functions for a common epoxy resin. The hyperbranched epoxy resin can be widely applied to the fields of electronic packaging, functional adhesives, and the like.

Description

technical field

[0001] The invention belongs to the technical field of polymer material preparation, in particular to a preparation method of a hyperbranched polymer. Background technique

[0002] Epoxy resin has the advantages of good mechanical and electrical properties, low shrinkage, easy processing and low price, and is widely used in adhesives, coatings, and advanced composite materials. However, due to its high crosslinking density and structural characteristics of benzene ring skeleton after curing, epoxy resin has poor impact resistance and insufficient toughness.

[0003] In the prior art, the toughening methods of epoxy resin mainly include core-shell polymer toughening, IPN toughening, thermotropic liquid crystal polymer toughening, rubber-like elastomer toughening, nanoparticle toughening, and the like. However, these toughening methods will cause a significant decrease in the tensile strength and bending strength of the resin while improving the toughness of t...

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