A kind of halogen-free flame-retardant high shading PC composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant high shading PC composite material and a preparation method thereof. The halogen-free flame-retardant high shading PC composite material is prepared from the following raw materials in percent by mass: 1.5-75% of PC resin, 6-12% of a halogen-free flame retardant, 0.2-0.8% of a chain extender, 10-16% of titanium dioxide, 5-14% of washed montmorillonite, 2-5% of a flexibilizer, 0.1-0.3% of an antioxidant, 0.2-0.4% of a lubricant and 0.1-0.3% of an ultraviolet absorbent. The invention also discloses a preparation method of the halogen-free flame-retardant high shading PC composite material. The PC composite material also has the characteristics of being flame-retardant, high in toughness and easy to form while having an extremely high shading rate. The preparation method is simple, and the production cost is low. The obtained PC composite material can be used for producing parts of electric products such as an LED display, a liquid crystal backlight part and an LCD display.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant high-light-shielding PC composite material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] PC resin is polycarbonate resin, which not only has excellent mechanical properties, electrical properties, transparency, dimensional stability and heat resistance, but also has good impact resistance and high refractive index. Therefore, PC resin can be widely used in white cover materials of light guide plates, LED lamp holders, charger shells or other electronic and electrical accessories. [0003] Although PC materials have many advantages, they still cannot meet the special needs in the field of electronic lighting. For example, some parts of LED displays and LCD displays require high shading properties. There are also gradually flame retardant requirements, and halogen-free flame retardant is required, so PC needs to be modified. ...

AI Technical Summary

Problems solved by technology

[0003] Although PC materials have many advantages, they still cannot meet the special needs in the field of electronic lighting. For example, some parts of LED displays and LCD displays require high shading properties. There are also gradually flame retardant requirements, and halogen-free flame retardant is required, so PC needs to be modified

At present, most of the shading PC materials on the market are realized by filling a large amount of titanium dioxide. Usually, the filling amount of titanium dioxide is more than 20%. The single material obtained by adding titanium dioxide has a low shading effect and a large amount of Titanium dioxide has a great destructive effect on the toughness and rigidity of PC materials, making the molded products fragile. Even adding a toughening agent can not improve the toughness, and cannot meet some products that require toughness.

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