PET composite material

Abstract

The invention discloses a PET composite material, which comprises the following components in parts by weight: 34 to 55 parts of PET, 25 to 45 parts of enhanced filling material, 3 to 8 parts of composite nucleating agent, and 0 to 3 parts of flexibilizer; wherein the composite nucleating agent comprises a chemical nucleating agent and a plasticizer, the weight ratio of the plasticizer to PET resin is 3.5-7:100, the plasticizer is prepared by compounding a benzsulfamide plasticizer with other plasticizers, other plasticizers can be one or more of polyethylene glycol-diethyl hexyl alcohol, neopentyl glycol diphenyl ester, tribenzyl propylidene ether diethyl hexyl alcohol, and triethylene glycol diphenyl ester, the structural formula of the benzsulfamide plasticizer is represented in the description, and in the structural formula, R represents a branched alkyl group or a straight chain alkyl group. The composite material is injection-moulded at a mould temperature of 85 DEG C, the crystallization is complete, the moulding period is short, and the PET composite material can be used to produce large moulded goods or precision thin-wall moulded goods.

Description

technical field [0001] The invention relates to the field of polymer material preparation, in particular to a glass fiber-reinforced PET composite material with excellent high-temperature dimensional stability and rapid injection molding at low mold temperature. Background technique [0002] As one of the five general-purpose engineering plastics, polyethylene terephthalate (PET) has outstanding toughness, aging resistance, creep resistance, friction and wear resistance, and its glass fiber reinforced products (PET / GF) have Excellent physical and chemical properties, heat resistance and electrical properties. Compared with similar polybutylene terephthalate (PBT) and nylon (PA) materials, the overall performance of glass fiber reinforced PET is better than PBT, close to PA, The price is even more advantageous, attracting a large number of researchers to devote themselves to the research of PET plastic engineering. [0003] However, the PET molecular chain is relatively rigi...

AI Technical Summary

Problems solved by technology

[0005] Over the years, a large number of researches and inventions have focused on adding various nucleating agents (including inorganic, organic and polymers, etc.) to increase the thermal crystallization peak temperature of PET to around 220°C, shortening the crystallization cycle, but such methods have no The effect of reducing the cold crystallization temperature is not obvious, and it is impossible to ensure that low mold temperature injection molding products have a high degree of crystallinity, and PET cannot be adapted to the existing water cooling system technology of injection molding machines

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