Halogen-free flame-retardant styrene-series resin composition and preparation method thereof

Abstract

The invention relates to a halogen-free flame-retardant styrene-series resin compound and a preparation method thereof. The resin composition comprises the following components in parts by weight: 40-80 parts of styrene system resin, 20-60 parts of a char forming agent, 0-5 parts of a compound char forming agent, 5-25 parts of a halogen-free flame retardant, 0.5-10 parts of a toughening agent, 0.1-0.5 part of an anti-falling agent, 0.1-1 part of an antioxidant and 0.2-2 parts of a lubricating agent. The preparation method comprises the following steps of: premixing the raw materials through a high mixer; performing melt extruding through a dual-screw extruder; and cooling and granulating to obtain a product. The obtained product is accordant with the requirements of halogen freeness and environmental friendliness, has superior flame retardance and mechanical performance, and can be used for office equipment such as copiers, printers, fax machines and the like, and household electrical appliance products such as displays, cameras, air conditioners, refrigerators and the like with requirements of halogen freeness and environmental friendliness.

Description

technical field [0001] The invention relates to a resin composition, in particular to a halogen-free flame-retardant styrenic resin composition and a preparation method thereof. Background technique [0002] Acrylonitrile-butadiene-styrene copolymer resin (ABS) has excellent comprehensive properties such as high impact, high heat resistance and chemical corrosion resistance, and electrical insulation performance. It has been widely used in the automotive industry, household appliances, office equipment, Electrical products and other fields. However, since ABS resin is a flammable polymer material, flame retardant modification is required when it is used in various electronic and electrical products with flame retardant requirements. At present, the flame retardant system commonly used in ABS is a synergistic system of halogenated flame retardants and antimony trioxide. With the further strengthening of people's awareness of environmental protection in recent years, the plas...

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Problems solved by technology

[0003] The flame retardant efficiency of red phosphorus is high, but the scope of its use is limited due to the problems of color and compatibility; inorganic flame retardants such as aluminum hydroxide, magnesium hydroxide, etc. are added in large amounts, and because of their polarity Large, poor compatibility with materials, which greatly reduces the mechanical properties of materials; phosphorus-nitrogen intumescent flame retardants have low flame retardant effects, and are easy to decompose during processing, resulting in serious blooming

At present, there are many reports on the use of phosphate flame retardants, but the flame retardancy of ABS is still poor when phosphate flame retardants are used alone, and the addition of a large amount of phosphate flame retardants will sharply reduce the impact strength and heat resistance of ABS. deformation temperature

[0004] The current halogen-free flame-retardant ABS products are usually achieved by adding a certain amount of char-forming agent and phosphate flame retardant. Commonly used char-forming agents include epoxy resin, polycarbonate (PC), polyphenylene ether (PPE), etc. Although epoxy resin has a high oxygen index, it often cannot reach the V0 level of flame retardancy when testing flame retardancy according to the UL94 standard, and the mechanical properties will be severely reduced due to poor compatibility with ABS matrix resin; PC or PPE will have the problems of high processing temperature and high cost, which does not meet the environmental protection trend of energy saving

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