A kind of foamable pet resin and its preparation method and application

Abstract

The present invention discloses a foamable PET resin, a preparation method and uses thereof. The preparation method comprises: (1) uniformly mixing raw material components, wherein the raw material components comprise 985-995 parts of physically recycled PET bottle flakes, 1-9 parts of a chain extender, 1-3 parts of an antioxidant, and 1-3 parts of a thermal stabilizer, and a three-functional-group chain extension monomer and a multi-functional-group chain extension monomer having a functional group number of 4-6 are compounded according to a mass ratio of 1:3-5:1 to prepare the chain extender; (2) carrying out melt extrusion granulation; and (3) carrying out solid phase condensation polymerization on the obtained material for 1-5 h at a temperature of 210-230 DEG C under a vacuum degree of 5-100 Pa so as to obtain the foamable PET resin. According to the present invention, the foamed PET resin has characteristics of high molecular weight, wide molecular weight distribution, high melt strength, physically recycled PET degrading use changing, low raw material cost, and simple preparation process; and with the combination of the chain extender, the reaction extrusion and the solid phase condensation polymerization are combined, such that the reaction period is shortened, and the industrial production is easily achieved.

Description

A kind of foamable PET resin and its preparation method and application technical field The invention relates to a polyester foam material, in particular to a foamable PET resin and its preparation method and application. Background technique Polyethylene terephthalate (PET) is the thermoplastic polyester with the largest output and the cheapest price. It has excellent physical, chemical and mechanical properties and is widely used in synthetic fibers, biaxially stretched films and polyesters. In recent years, it has also shown broad application prospects in the field of foam materials. PET polyester foam has the advantages of light weight, high specific strength, high rigidity, good electrical insulation and heat and sound insulation. It can be used in food packaging, building materials, wire insulation, microwave containers, refrigerator inner panels, sports equipment, Automotive, aerospace and other fields. At present, the total output of PET polyester in my country i...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to overcome the low molecular weight and poor melt strength of the existing physical recovery PET polyester, which is difficult to normally foam in the reaction extrusion and the simple toughening agent chemically modified PET molecular structure is not suitable for foaming Defects, provide a kind of foamable PET resin and its preparation method and use

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