A low-cost and high-fluidity halogen-free flame-retardant PC material and preparation method thereof

Abstract

The invention relates to a low-cost high-flowability halogen-free flame retardant polycarbonate (PC) material which includes, by weight, 70-100 parts of polycarbonate (PC), 0-20 parts of a flow modifying agent, 0-10 parts of a flexibilizer, 0.1-2 parts of a halogen-free flame retardant agent, 0-4 parts of a flame retardant synergist, 0.1-1 part of an anti-dropping agent, 0.1-1 part of a lubricant and 0.1-1 part of an antioxidant. The invention also provides a preparation method of the halogen-free flame retardant PC material. Compared with the prior art, the invention overcomes a defect of poor flowability in like products and significantly improve the flowability of the material by adding the flow modifying agent and employing a specially-modified anti-dropping agent. Meanwhile, the material is preferably compounded with a sulphonate (sulphonate ester) flame retardant agent which is very high in flame retardant efficiency. With a high-efficiency flame retardant synergist, the material is significantly reduced in usage amount of the flame retardant agent, and the material is further reduced in cost and is further excellent in mechanical performance. Flame retardance of the material reaches UL94V-0 grade (1.6mm). The material can completely satisfy a material requirement of device shells of injection moulded thin-wall electronic products.

Description

technical field [0001] The invention relates to the technical field of polycarbonate modification, in particular to a low-cost, high-fluidity halogen-free flame-retardant PC material and a preparation method thereof. This halogen-free flame-retardant PC material can be applied to the production of thin-walled electronic and electrical equipment casings. Background technique [0002] Polycarbonate (PC) is an engineering plastic with excellent comprehensive properties. Because of its excellent weather resistance, high impact resistance, and good electrical insulation, it is widely used in the fields of electronics, automobiles, and machinery industries. The flame retardant grade of PC is UL94V-2, but it is flammable. When it burns, it drips hot melt and causes nearby materials to catch fire. Therefore, it is difficult to meet the requirements for flame retardant performance in some fields. Therefore, it is necessary to modify PC for flame retardant. [0003] Halogenated flame...

AI Technical Summary

Problems solved by technology

The flame retardant grade of PC is UL94V-2, but it is flammable. When it burns, it drips hot melt, causing nearby materials to catch fire, so it is difficult to meet the requirements for flame retardant performance in some fields, so it is necessary to modify PC for flame retardant

[0003] Halogenated flame retardants Due to environmental pollution problems, more and more high-efficiency halogen-containing flame retardants are banned, especially in developed countries or regions such as Western Europe, Japan, and North America; organophosphates are a type of halogen-free flame retardants that are widely used Flame retardant, but its own decomposition temperature is low, although the addition of 5%-15% has a good flame retardant effect on PC, but when added alone, it will greatly damage the mechanical properties; organosilicon compounds are a class of High-efficiency, non-toxic, low-smoke, and environmentally friendly flame retardants, but they are expensive and difficult to popularize, and their flame retardant effect is not enough when used alone, so they need to be used in combination with other flame retardants; sulfonate flame retardants It is a kind of high-efficiency flame retardant suitable for PC flame retardant developed in recent years. It has high flame retardant efficiency, less addition amount, and hardly damages the mechanical properties of materials.

[0004] Unmodified medium-viscosity polycarbonate raw materials still have insufficient processing fluidity, which limits their application in thin-walled products

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