High-flowability and high-toughness PC/PET (polycarbonate/polyethylene terephthalate) composite and preparation method thereof

Abstract

The invention discloses a high-flowability and high-toughness PC / PET (polycarbonate / polyethylene terephthalate) composite. The high-flowability and high-toughness PC / PET composite is prepared from PCresin, PET resin, a toughening agent, a flame retardant, an antioxidant and other aids, wherein the toughening agent is a styrene-butadiene-glycidyl methacrylate terpolymer and contains 30wt.%-40wt.%of styrene, 55wt.%-65wt.% of butadiene and 0.1wt.%-1.0wt.% of glycidyl methacrylate and has the mass average molecular weight being 18,000-25,000. On the premise that no compatibilizer or chain extender is used in the composite, the toughening agent with the special structure is selected, has very high toughening efficiency and has very small influence on the flowability of the composite, the thermal stability of the composite is improved, and the mechanical property of the composite is guaranteed. The flowability, toughness and thermal stability of the composite are greatly optimized, and thecomposite is particularly applicable to occasions with higher requirements for the flowability and the use environments.

Description

technical field [0001] The invention relates to a PC / PET composite material and a preparation method thereof, in particular to a high fluidity and high toughness PC / PET composite material and a preparation method thereof, belonging to the technical field of composite polymer materials and their processing. Background technique [0002] PC / PET composite material (polycarbonate / polyethylene terephthalate) is an engineering plastic with ideal comprehensive properties. In addition to the rigidity and heat resistance of PC resin and the solvent resistance of PET resin, It also has excellent properties that PC resin and PET resin alone do not have, so it can be used in many occasions. However, since PET resin is a crystalline polymer and PC resin is an amorphous polymer, the compatibility between the two is not good, and the mixing of the two will also lead to a decrease in the mechanical properties of the composite material. In addition, since PC resin contains terminal hydroxyl...

AI Technical Summary

Problems solved by technology

However, since PET resin is a crystalline polymer and PC resin is an amorphous polymer, the compatibility between the two is not good, and the mixing of the two will also lead to a decrease in the mechanical properties of the composite material.

In addition, because the PC resin contains terminal hydroxyl groups, it will react with the residual carboxyl and hydroxyl groups in the PET resin in the presence of titanium-based residual catalysts at high temperatures. Although this two-phase reaction can improve the compatibility of the two, it also There is a lot of uncertainty, and the reaction will also cause a sharp deterioration in the performance of the composite material in the later use process, greatly reducing the practicability of the PC / PET composite material

In order to solve the above-mentioned technical problems, there are technical personnel in the prior art to use styrene-acrylonitrile-glycidyl methacrylate as a chain extender, and the toughness and stability of the PC / PET composition obtained are all improved, but the chain extension The addition of additives will affect the fluidity and gloss of the composite material, which limits its popularization and application.

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