Weather-resistant PC/PET (Polycarbonate/Polyethylene Terephthalate) alloy and preparation method thereof

Abstract

The invention discloses a weather-resistant PC / PET (Polycarbonate / Polyethylene Terephthalate) alloy which comprises a PC resin, a PET resin, a compatilizer, a toughening agent, a phosphate type flameretardant, an antioxidant, other aids and phosphate anions which are 3-100ppm on the basis of the total weight of the PC / PET alloy. As the phosphate type flame retardant with a trace amount of TPP (Triphenyl Phosphate) is adopted as the flame retardant, the phosphate anions which are 3-100ppm are added in the alloy, and the phosphate anions can be matched with the trace amount of the TPP left in the phosphate type flame retardant, the reaction of the PC resin and the PET resin can be inhibited to a very large extent, the ester exchange reaction in the presence of lighting and moisture can be particularly reduced, the mechanical properties and the long-term color stability of the allot are greatly optimized, and the alloy is particularly applicable to situations with relatively high use environment requirements.

Description

technical field [0001] The invention relates to a PC / PET alloy and a preparation method thereof, in particular to a weather-resistant PC / PET alloy and a preparation method thereof, belonging to the technical field of polymer composite material processing. Background technique [0002] The PC / PET alloy formed by blending PC resin and PET resin has both the rigidity and heat resistance of PC resin and the solvent resistance of PET resin, so it has been widely used. However, since PET resin is a crystalline polymer and PC resin is an amorphous polymer, the compatibility of the PC / PET alloy formed by mixing the two is not good, and the mixing of the two also leads to a decrease in the mechanical properties of the composite material; in addition, due to PC resin contains terminal hydroxyl groups, which will easily undergo a two-phase reaction with the residual carboxyl and hydroxyl groups in PET resin under the catalysis of titanium-based residual catalysts at high temperatures. ...

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Problems solved by technology

However, since PET resin is a crystalline polymer and PC resin is an amorphous polymer, the compatibility of the PC / PET alloy formed by mixing the two is not good, and the mixing of the two also leads to a decrease in the mechanical properties of the composite material; in addition, due to PC resin contains terminal hydroxyl groups, which will easily undergo a two-phase reaction with the residual carboxyl and hydroxyl groups in PET resin under the catalysis of titanium-based residual catalysts at high temperatures. Although this two-phase reaction can improve the compatibility of composite materials, but at the same time It also has uncertainty. In the later use process, the reaction also causes a sharp deterioration in performance, and the product is very prone to discoloration and other problems, which greatly reduces the practicability of PC / PET alloy applications, especially when there is light or water. The reaction among the participants will intensify

At present, although some technicians point out that a small amount of TPP contained in BDP can effectively complex titanium-based catalysts and reduce the impact of titanium-based catalysts on the two-phase reaction, in many cases, especially when the environment is harsh, PC resin and PET resin The above-mentioned two-phase reaction between them is still serious, which affects the popularization and application of PC / PET alloys.

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