PET/PEB composite material and preparation method thereof

Abstract

The invention belongs to the technical field of the preparation of the high polymer material, and specifically relates to a PET / PBE composite material and a preparation method thereof. According to the method, PET, PBE and a compatilizer containing an epoxy group are blended, terminal hydroxyl and terminal carboxy of the PET react with the epoxy group in the compatilizer, the combination is tight,and the compatilizer and the PEB are good in compatibility, so that the performance of the composite material is obviously improved. Furthermore, processing is performed by utilizing high polymer material plasticization conveying equipment based on elongation rheology, the speed gradient and the flowing direction of the material melt are consistent in the elongation flow field, and clouds of dispersed phase particles suffer from greater tearing effect and cannot product rotation, so that the clouds of dispersed phase particles can be crushed and dispersed more effectively, and a blending system with smaller particle size and more uniform particle distribution can be acquired. The preparation method is simple, the notch impact strength of the obtained PET / PBE composite material is up to 44KJ / sq.m at the room temperature, and other mechanical properties of the material can be maintained at the same time; and the PET / PBT composite material has extensive application prospects at automobiles, electronic and electrical appliances, mechanical instruments, film products and other fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer materials, and in particular relates to a PET / PBE composite material and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is one of the most important engineering plastics at present. It is cheap, has excellent wear resistance, heat resistance, chemical resistance, electrical insulation, and high mechanical strength. properties, so it was developed as an engineering plastic in the 1960s. At present, PET engineering plastics have been widely used in many fields such as automobiles, electrical machinery, electronics, household appliances and machinery. [0003] However, when PET is used as an engineering plastic, it has the disadvantages of slow crystallization speed, poor impact performance, and high water absorption under the commonly used processing mold temperature (70-110°C), which seriously limits its application. Since the 1970s, pe...

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Problems solved by technology

However, the selection of raw materials for the components of the above-mentioned blending system did not make the resulting composite material achieve the desired impact toughness.

In addition, because most of the composite materials of the blending system are processed by the traditional screw, the materials are mainly affected by the shear flow field during the processing, so the velocity gradient formed by the materials is perpendicular to the flow direction of the melt, which is not conducive to the flow of the velocity gradient. The mutual diffusion and penetration of polymer molecules, and the material tends to rotate and transport in the shear flow field, which reduces the effect of external force on the fragmentation and dispersion of dispersed phase particles, so the plasticization and mixing effect of the blend is not good, and it is difficult to use Composites for optimal performance

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