Halogen-free flame-retardant SEBS thermoplastic elastomer composition and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant SEBS (styrene-ethylene-butadiene-styrene block copolymer) thermoplastic elastomer composition and a preparation method thereof. The raw material formula of the composition is composed of the following components by mass percent: 19-30% of SEBS, 10-17% of paraffin oil, 50-60% of magnesium hydroxide, 4-10% of boron-containing phenyl phosphonate flame retardant and 0.2-0.4% of antioxidant. The composition is prepared by the steps: mixing the boron-containing phenyl phosphonate flame retardant with magnesium hydroxide in a high-speed mixer to obtain a halogen-free flame retardant complex; and sufficiently and uniformly mixing swelled SEBS, the halogen-free flame retardant complex and the antioxidant, melting, mixing and extruding by a twin-screw machine, cooling, pelleting and drying. According to the invention, the boron-containing phenyl phosphonate flame retardant not only has flame retardant synergistic action with magnesium hydroxide, but also has a effect, and can well improve the mechanical properties of the halogen-free flame-retardant SEBS thermoplastic elastomer composition, so that the processing performance of the composition is excellent.

Description

Technical field [0001] The invention relates to a halogen-free flame-retardant hydrogenated styrene-butadiene-styrene block copolymer (SEBS) thermoplastic elastomer composition and a preparation method thereof, and belongs to the technical field of polymer material modification. Background technique [0002] Thermoplastic elastomer is a kind of polymer material that exhibits rubber elasticity at room temperature and can be plasticized and formed at high temperature. It has the advantages of convenient processing and recyclability. Styrenic block copolymer type thermoplastic elastomer is one of the earliest researched thermoplastic elastomers. SEBS is a polystyrene type thermoplastic elastomer. Due to the high saturation of the main chain of the SEBS molecule, it has excellent stability, heat resistance, Oxidation resistance, weather resistance and solvent resistance, it has excellent application properties of rubber without vulcanization, and it can be thermoplastic processed lik...

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Problems solved by technology

Chinese invention patent (CN200810207538.4) discloses a halogen-free flame-retardant elastomer composite material and its preparation method. The patent uses SEBS and polypropylene as the matrix, and nitrogen-phosphorus ammonium polyphosphate as the main flame retardant. Magnesium is an auxiliary flame retardant. When the total amount of flame retardant added is 33wt%, it can reach UL94V-0 level, but the tensile strength of the obtained composite material is only 2.9MPa, and the flame retardant system has a great influence on the performance of SEBS matrix

Chinese invention patent (CN200710046721.6) discloses a halogen-free flame-retardant elastomer composite material and its preparation method. The patent uses ethylene-propylene block copolymer, SEBS, and ethylene-vinyl acetate copolymer (EVA) as the matrix. Coated red phosphorus is used as a flame retardant synergist of magnesium hydroxide. Although higher flame retardant and mechanical properties are obtained at a lower flame retardant dosage of 43wt%, the use of red phosphorus brings insurmountable defects. It can only be used for dark-colored products. In addition, it will release a pungent smell when burned, and the amount of smoke will be large, which is difficult to meet the requirements of low-smoke and non-toxic

[0004] It can be seen from the above that the use of magnesium hydroxide and other flame retardants to compound flame-retardant SEBS, while improving flame retardancy, mostly causes mechanical properties to decline or other insurmountable problems

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