PPS (polyphenylene sulfide) composite material and preparation method thereof

Abstract

The invention discloses a PPS (polyphenylene sulfide) composite material and a preparation method thereof. The PPS composite material is prepared by raw materials in percentage by weight as follows: 19%-49.5% of PPS, 50%-80% of heat conducting master batch taking PA (polyamide) 12 as a matrix and 0.5%-1.0% of a lubricating agent. According to the preparation method, the heat conducting master batch is firstly prepared by raw materials in percentage by weight as follows: 13%-19% of PA 12, 20%-65% of magnesium oxide with small particle size, 20%-65% of magnesium oxide with large particle size, 0.5%-1.0% of an antioxidant and 0.5%-1.0% of an lubricating agent; and the well prepared master batch, PPS and the lubricating agent are blended to prepare the PPS composite material. The PPS composite material prepared with the heat conducting master batch method is provided with high-filling heat conducting filler, has excellent processing property, impact strength and heat conduction property and is simple in process.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyphenylene sulfide composite material and a preparation method thereof. Background technique [0002] Polyphenylene sulfide (PPS) is a new type of high-performance thermoplastic resin. As a special engineering plastic with excellent comprehensive properties, it has excellent heat resistance, mechanical properties, flame retardancy, electrical properties and precision molding properties. , After being filled and modified, it is widely used as special engineering plastics. At the same time, PPS can also be made into various functional materials, which are widely used in the fields of electronics, aerospace, automobile transportation, chemical industry and machinery. Thermally conductive PPS is a hot spot in the functionalization of PPS. On the basis of maintaining the excellent performance of PPS, it endows it with high thermal conductivity and expands its applicati...

AI Technical Summary

Problems solved by technology

Although this invention forms a dual continuous phase structure through the addition of polyamide and process control to improve the thermal conductivity of PPS, it still has the following shortcomings: (1) The addition of too much polyamide greatly reduces the flame retardancy of the material, restricting its use in electronics and electrical (2) Twin-screw is used to prepare thermally conductive masterbatches, and the content of thermally conductive fillers is not high (50~60%), resulting in only 30~40% of thermally conductive fillers in the final thermally conductive PPS, which affects the thermal conductivity of the material

Its purpose is to form a bicontinuous structure through polyphenylene sulfide and polyamide, and the thermally conductive filler forms two independent heat conduction networks in polyphenylene sulfide and polyamide to improve the thermal conductivity of PPS, but the invention has the following disadvantages: (1) The preparation method of the masterbatch still uses a twin-screw extruder, resulting in a low filling amount; (2) Excessive addition of polyamide will affect the flame retardant performance of PPS; (3) Graphene, carbon fiber, and graphite are used Such as carbon-based thermally conductive fillers, while improving the thermal conductivity of PPS, it also greatly reduces its insulation performance

Although this invention uses different particle sizes of thermal conductive fillers to improve the thermal conductivity of PPS, there are still the following shortcomings: (1) small particle thermal conductive fillers are easy to cause dust pollution, which is not conducive to the environment and human health; (2) different particle sizes, The mixing of density powder can easily lead to uneven mixing, resulting in difficulty in feeding and processing problems; (3) A large amount of powder is directly extruded by twin-screw, which will cause great wear to the screw, and at the same time, it is prone to processing problems such as broken bars and degradation.

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