Halogen-free flame retardant cold-resistant conductive polycarbonate/carbon fiber composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant cold-resistant conductive polycarbonate / carbon fiber composite material and a preparation method of the halogen-free flame retardant cold-resistant conductive polycarbonate / carbon fiber composite material. The halogen-free flame retardant cold-resistant conductive polycarbonate / carbon fiber composite material comprises 55-85 parts of PC resin, 10-30 parts of carbon fiber, 5-10 parts of cold-resistant flexibilizer, 0.08-1 part of fire retardant, 0.5-5 parts of synergistic fire retardant, 0.4-2 parts of antioxygen, 0.2-0.5 part of ultraviolet light absorber and 0.3-1 part of lubricant, wherein the melt flow rate MFR of the PC resin is 10-40g / 10min, and the carbon fiber is subjected to surface modification and is a chopped carbon fiber with the length of 3-12mm. The preparation method provided by the invention is simple and is easy in processing, the low-temperature impact property, the flame retardant property, the conductive property and the mechanical property of the product are further improved under the condition that the original properties of the PC resin are kept, and the halogen-free flame retardant cold-resistant conductive polycarbonate / carbon fiber composite material and the preparation method of the halogen-free flame retardant cold-resistant conductive polycarbonate / carbon fiber composite material are applicable to the fields of industries, transportation, military projects, areospace and the like with severe requirements.

Description

technical field [0001] The invention relates to the field of conductive plastics, in particular to a halogen-free flame-retardant and cold-resistant conductive polycarbonate / carbon fiber composite material, and also relates to a preparation method of the composite material. Background technique [0002] Conductive plastics are functional polymer materials obtained by processing conductive media and resins by plastic processing methods. They have conductive or antistatic functions, which can release harmful static charges and avoid losses caused by static electricity. Conductive polycarbonate plastic is one of the commonly used conductive plastics, usually by adding conductive additives such as carbon black, metal powder, carbon fiber, stainless steel fiber or nickel-plated fiber to achieve a certain conductive or antistatic effect. Due to the high glass transition temperature of polycarbonate, the mechanical properties of the product are poor in low temperature environments,...

AI Technical Summary

Problems solved by technology

Due to the high glass transition temperature of polycarbonate, the mechanical properties of the product are poor in low temperature environments, especially the impact performance is greatly reduced. Now it is also possible to modify the low temperature toughness by adding a toughening agent. By adding a flame retardant However, the addition of tougheners and flame retardants will seriously affect other mechanical properties of the product, especially the reduction of tensile strength, flexural strength and flexural modulus. This problem has not been resolved.

[0003] For example, the patent number is 201310054073.4, and the name is a Chinese invention patent for a special flame-retardant conductive polycarbonate material and its preparation method. The invention patent is to improve the toughness and resistance of conductive polycarbonate plastics by adding toughening agents and flame retardants. Flammability, although the flame retardancy reaches the UL94 V-0 level, the addition of a large amount of flame retardants has a certain impact on the physical properties of the product. The tensile strength, flexural strength and flexural modulus of the obtained product are all low, and at the same time It will also increase the cost of the enterprise, which is not conducive to the long-term development of the enterprise. In addition, the addition of conductive carbon black will also affect the processing performance of the material