Double screw extrusion method being suitable for extruding modified polyphenylene oxide alloy products

Abstract

The invention discloses a double-screw extruder being suitable for extruding modified polyphenylene oxide alloy products. The screw is divided into A, B and C three-section combination form of cutting and kneading blocks in sequence along material transmission direction; the double screw extruder is correspondingly divided into area A, area B and area C, wherein, the area A is the area for initially melting various materials; the area B is the area for melting various materials once again to achieve semi-melting state and for initially kneading area simultaneously; the area C is the area for composition kneading and mixing of fire retardant and various materials, and for evenly distributing various materials simultaneously; and the front part of the area A is a blanking area, the rear part of the area C is a vacuum area, the area between the area A and the area B, and the area between the area B and the area C are a decompressing area, a transmitting area and a boosting area, thus various materials of the invention can be sufficiently melted and mixed.

Description

Technical field: [0001] The invention relates to a twin-screw extruder. Background technique: [0002] Modified polyphenylene ether has excellent mechanical properties, electrical resistance, heat resistance, good dimensional stability and weather resistance. These excellent properties make the modified polyphenylene ether products widely used in many special industries. Such as high-voltage electrical industry, household appliances, office supplies, auto parts, precision instruments, textile equipment, military industry, civil or special water supply industry. [0003] There are various components in modified polyphenylene ether products, such as polyphenylene ether raw powder, polystyrene and its derivatives, tougheners, antioxidants, flame retardants and other additives, most of the current products It adopts twin-screw extrusion method to produce modified polyphenylene ether products. The uniform mixing of various raw and auxiliary materials in the product is the key ...

AI Technical Summary

Problems solved by technology

The melting temperature of various materials is different. For example, the melting temperature of PPO raw powder is above 300°C, while the melting temperature of flame retardant is only 40°C or even lower. If the melting temperature of materials is too high, decomposition and Vaporization seriously affects the composition of materials in the product and the performance of the product; the melting temperature is too low, some materials do not melt, and the dispersion of various materials in the product is not good, resulting in low performance of the product, which cannot meet the needs of customers.

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