Low-temperature toughened and reinforced PC/PBT (polycarbonate/polybenzothiazole) alloy material and preparation method thereof

Abstract

The invention relates to a low-temperature toughened and reinforced PC/PBT (polycarbonate/polybenzothiazole) alloy material and a preparation method thereof. The PC/PBT alloy material is prepared from raw materials such as PC resin, PBT, a low-temperature toughening agent, a reinforcing agent, a bulking agent and an antioxidant, wherein the toughening agent is diolefin-styrene-methyl methacrylate (MBS/MIS) which is of a core-shell structure, the reinforcing agent is non-alkali chopped glass fiber, the bulking agent is an ethylene-methyl acrylate copolymer (EMA), and the antioxidant is prepared by compounding an antioxidant 1010 and an antioxidant 168. The preparation process disclosed by the invention is implemented by using single and double screw extruders in cooperation with a two-step extrusion process, the technical characteristic is stepwise feeding, and the preset temperatures of the two extruders are differentiated. Through the implementation of the formula and the process, a low-temperature-resistant and high-strength PC/PBT alloy material which is excellent in performance and good in appearance can be prepared, and the PC/PBT alloy material can be widely used in the aspects of auto parts, bumpers, elevator parts, electrical and electronic engineering, engineering assembly parts for cold regions, and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and relates to the preparation of a low-temperature-resistant high-strength impact-resistant engineering plastic, in particular to a low-temperature (-20 to -40°C) toughened and reinforced PC / PBT alloy material and a preparation method thereof. Background technique [0002] Polycarbonate (PC) resin is an excellent thermoplastic engineering plastic with high impact strength, good transparency, good creep resistance and dimensional stability, heat resistance, low water absorption, non-toxic, excellent dielectric properties, etc. Advantages, belonging to one of the five major engineering plastics. In recent years, the growth rate of polycarbonate resin is much higher than that of other engineering plastics. So far, it has been widely used in electronics, automobile industry, medical equipment aviation, aerospace, electronic computer, optical fiber and other fields. However, due...

AI Technical Summary

Problems solved by technology

Although glass fibers have a good reinforcing effect on materials, the current preparation method in this field is to extrude toughener, compatibilizer and reinforcing agent together with PC / PBT material through extruder once , while tougheners and compatibilizers are only suitable for low-temperature blending (blending temperature 180-240°C) and glass fibers are only suitable for high-temperature blending (blending temperature 270-320°C), resulting in Both toughening and strengthening effects are affected

Although the materials prepared according to the existing technology can still achieve the various indicators at room temperature, the toughness and strength of the material cannot meet the requirements in the low temperature environment of -20 ~ -40 °C; the tensile strength value of the material's strength index decreases To 40~60MPa, far below the requirement of low temperature tensile strength ≧85MPa at -40℃, the impact strength value of the toughness index of the material is 30~60% lower than that of the system alone adding toughening agent and (phase) solvent , down to 4~6KJ / m 2 , which is much lower than -40℃ low temperature impact strength≧15KJ / m 2 requirements, thus limiting the application fields of PC / PBT alloy materials

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