Yellowing-resistant SBS polymer and preparation method thereof

Abstract

The invention discloses an anti-yellowing SBS polymer and a preparation method thereof, and relates to the technical field of high-molecular copolymers. According to the preparation method of the yellowing-resistant SBS polymer, firstly, lithium alkyl or aluminum alkyl compound is used as an impurity breaking agent at a low temperature to react with unavoidable impurities in styrene and butadiene monomers and auto-polymers to form inert substances, then the inert substances are removed through a molecular sieve bed or distillation, and the yellowing-resistant SBS polymer is obtained. The anti-yellowing SBS polymer provided by the invention has the advantages that impurities in styrene and butadiene monomers are fully removed, the situation that a block copolymer SBS cannot be formed in the polymerization process is avoided, the anti-yellowing problem of the SBS polymer is radically solved, and on the basis, the anti-yellowing SBS polymer provided by the invention can be kept not yellowing for more than 2 hours under external thermal stimulation of 180 DEG C, and the anti-yellowing SBS polymer has good anti-yellowing performance. And under the double stimulation of 50 DEG C thermal stimulation and light and heat of a 500 W xenon lamp, the product can be kept without yellowing for more than 360 hours.

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