Modified SEBS composite material for automobile injection molding interior decoration, and preparation method thereof

Abstract

The invention discloses a modified SEBS composite material for automobile injection molding interior decoration, and a preparation method thereof. The material is prepared from, by weight, 50 to 80 parts of a hydrogenated styrene-butadiene segmented copolymer, 20 to 25 parts of a plasticizer, 3 to 8 parts of hydrotalcite, 2 to 5 parts of acetylated SEBS, 5 to 10 parts of hydroxylated SEBS, 0.4 to0.8 part of an antioxidant, 0.3 to 0.6 part of a weather-resistant agent, 0.5 to 1 part of a lubricant and 0 to 3 parts of an auxiliary agent. The dyne index of the material can reach 46 N / m, the tearing strength can reach 36 kN / m, the tensile strength can reach 13 Mpa, and the elongation at break is larger than 500%, so that the material is high in surface dyne index and good in flowing property,and the comprehensive performances of the material are well balanced.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a modified SEBS composite material used for injection molding of automobiles and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of modern technology and the continuous expansion of the application field of polymer materials, polymer materials have become a new type of material that is indispensable in industrial production and people's daily life. Thermoplastic elastomers (TPE) appear as intermediate materials between rubber and plastics. Among the many categories of thermoplastic elastomers, hydrogenated styrene-butadiene block copolymer (SEBS) thermoplastic elastomers in styrene-based tri-block copolymers have become more and more popular in recent years because of their excellent performance and great application value. get people's attention. In addition, due to the strengthening of people's awareness of enviro...

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Problems solved by technology

[0004] Chinese invention patent CN 103756237B discloses a modified SEBS alloy and its preparation method, which introduces the use of antimony chromate / titanium dioxide nanomaterials to modify SEBS, which improves the crystallization properties of the material, thereby improving the physical properties of the material. The photocatalytic activity of the modified SEBS alloy is improved by changing the crystal form, and the aging resistance of the material is also improved to a certain extent, but the composite material does not mention the interface bonding between the matrix SEBS and the inorganic material, and the increase of inorganic substances will affect The fluidity of materials makes it difficult for composite materials to form larger parts, which is difficult to match the current injection molding needs and market trends of large parts such as automotive interior IP and door panels.

[0005] Chinese invention patent CN 101781391B discloses a preparation method of controllable modified SEBS rubber. By designing SEBS with different degrees of chloromethylation as initiators, the synthesis reaction obtains polar SEBS with controllable graft density, molecular weight and distribution. ; This patent mainly focuses on the polarity of synthetic SEBS, and does not involve the fluidity and molding methods of SEBS, SEBS compound modification, etc.

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