High-property polycarbonate composition containing SAG compatibilizer which has special structure, and preparation method of polycarbonate composition

Abstract

The invention discloses a high-property polycarbonate composition containing an SAG compatibilizer which has a special structure. The polycarbonate composition comprises PC resin, PET resin, a compatibilizer, a toughening agent, a fire retardant, an antioxidant and other auxiliary agent, wherein the compatbilizer is an SAG copolymer which is prepared from 50-85 wt% of styrene monomers, 10-40 wt% of acrylonitrile monomers and 0.5-30 wt% of glycidyl methacrylate in a water medium by using a suspension polymerization process. In the preparation of the composition, a specially prepared compatibilizer is selected, so that the compatibility of PC resin and PET resin is increased, the transesterification between the PC resin and the PET resin is notably inhibited, and the stability and toughness of the blend products are increased. In addition, a proper amount of a dispersing agent is selectively added in the preparing process of the compatibilizer, so that the long-term influence on PC / PET alloy by damp and hot conditions is deceased to a low level. The initial mechanical properties and long-term aging resistance in damp and hot conditions of the polycarbonate composition provided by the invention are both optimized greatly, so that the polycarbonate composition is especially suitable for occasions with high requirements of using environment.

Description

technical field [0001] The invention relates to a high-performance polycarbonate composition and a preparation method thereof, in particular to a high-performance polycarbonate composition containing a special-structure SAG compatibilizer and a preparation method thereof, and belongs to the technical field of composite polymers. Background technique [0002] Polycarbonate resin (PC resin) is a colorless and transparent amorphous thermoplastic material, because it is easy to process and suitable for injection, extrusion, blow molding and other molding methods, and has good mechanical and optical properties, Therefore, it is widely used in many fields such as packaging, daily necessities, electronic appliances, toys, instruments, transportation and machine manufacturing. However, pure PC resin has high melt viscosity, poor solvent resistance, high sensitivity to notches, and high cost. [0003] Polyethylene terephthalate resin (PET resin) is a translucent crystalline thermopla...

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Problems solved by technology

[0004] However, since PET resin is a crystalline polymer and PC resin is an amorphous polymer, the alloy compatibility between PC resin and PET resin is very poor, and the mixing of the two will also lead to a significant drop in the mechanical properties of the composite material.

In addition, since the PC resin contains terminal hydroxyl groups, it is very easy to undergo a two-phase reaction with the residual carboxyl groups and hydroxyl groups in the PET resin at high temperatures and the presence of titanium-based residual catalysts, although the reaction can improve compatibility. With great uncertainty, the above reactions will also cause a sharp deterioration in the performance of the composite material during later use, greatly reducing the practicability of PC / PET alloy applications

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