High-luster flame retardant polypropylene complex without precipitates on surface and preparation method thereof

Abstract

The invention discloses a high-luster flame retardant polypropylene complex without precipitates on a surface and a preparation method thereof. The high-luster flame retardant polypropylene complex without the precipitates on the surface comprises the following raw materials in percentage by weight: 77.0 to 95.0 percent of polypropylene (PP) resin, 3.5 to 20.0 percent of flame retardant, 0.3 to 1.5 percent of antioxidant, 0.3 to 1.5 percent of light stabilizer and 0.3 to 1.5 percent of processing aid. The high-luster flame retardant polypropylene complex without the precipitates on the surface has excellent flame retardance, high surface lustrousness, low specific gravity, excellent weather resistance and high surface hardness, rigidity and heat resistance, does not have the precipitates on the surface, is easy to machine, and can be widely applied to the field of electronic and electric products; and the flame retardant rating can reach UL94V-2 and UL94V-0, and the surface lustrousness is between 90 and 95 percent.

Description

technical field [0001] The invention relates to a modified polypropylene material, in particular to a high-gloss flame-retardant polypropylene compound without precipitation on the surface and a preparation method thereof. Background technique [0002] Polypropylene is a general-purpose thermoplastic with excellent comprehensive properties. Its density is small, and its mechanical properties such as yield strength, tensile strength, compressive strength, surface hardness and elastic modulus are relatively excellent; it also has outstanding resistance to stress cracking and wear resistance; it has good heat resistance, continuous use temperature The highest temperature can reach 120°C, and it is the fastest-growing plastic variety in recent years. However, polypropylene is extremely flammable, its oxygen index is only 17.0-18.0%, and it cannot be extinguished after being ignited. Therefore, it must be flame-retardant modified to expand its application field. [0003] The fl...

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Problems solved by technology

Flame retardants such as DBDPO / DBDPE have a high melting point (up to 350°C), and will not melt during blending with PP. They are similar to fillers, and the addition amount is high, and the surface gloss of the modified material is low; OBE, HBCD, Flame retardants such as octabromobis-S ether and TTBNP have a low melting point, melt when blended with PP, and can be well dispersed into PP resin, so they have little effect on the impact performance of the material, but will increase the strength of the material. and thermal performance are significantly reduced

In addition, for OBE flame-retardant polypropylene materials, after a period of time, the flame retardant will precipitate from the surface of the material, especially for dark-colored products, which greatly affects the appearance of the product

The flame-retardant polypropylene material of HBCD and octabromobis ether, due to the poor heat resistance of HBCD and octabromobis ether, is relatively easy to decompose and carbonize during processing, which greatly restricts the performance of the product

Although the compatibility of the two flame retardants with PP resin is better than that of OBE flame retardant, the flame retardant polypropylene material will also have a slight blooming phenomenon after being placed for a period of time; the flame retardant polypropylene material with TTBNP, the surface The effect is good, but the flame retardant performance can only achieve UL94V-2, which greatly limits the scope of use of the product

Therefore, none of the above-mentioned flame-retardant polypropylene materials can well meet the requirements for use in the field of electronic appliances.

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