Process for industrialized continuous removal of alkaline impurities in SEBS rubber liquid or SBS rubber liquid

Abstract

The invention relates to a process for industrialized continuous removal of alkaline impurities in an SEBS rubber liquid or an SBS rubber liquid. An emulsifying machine for emulsifying deionized water with a rubber liquid and an emulsifying machine for emulsifying neodecanoic acid with the rubber liquid are in series operation, and thereafter, a high-speed centrifugal separator is used for separating the emulsified water and the emulsified rubber liquid, moreover, the high-speed centrifugal separator operates in a continuous feeding mode, and lithium ions and other alkaline impurities in the SEBS rubber liquid or the SBS rubber liquid are continuously and effectively removed; the process is simple and efficient, and is suitable for industrialized production for removal of the alkaline impurities in the SEBS rubber liquid or the SBS rubber liquid.

Description

technical field [0001] The invention belongs to the field of preparation technology of macromolecule SEBS or SBS materials, and in particular relates to a technology for industrialized continuous removal of alkaline impurities in SEBS glue or SBS glue. Background technique [0002] Baling brand SEBS products are developed using technology with independent intellectual property rights, which fills the gap in the domestic rubber industry. SEBS products are products after hydrogenation of styrene-butadiene block copolymers, which have excellent aging resistance and high and low temperature performance, and are widely used in wire and cable, auto parts, toys, adhesives and polymer modification, etc. multiple fields. The composite antioxidant system used in SEBS products has good thermal oxidation resistance and weather resistance, which includes a phosphite antioxidant and a phenolic antioxidant. Since the industrial production of SEBS in 2006, 2.6.4, 6.2.6, TNP, etc. have bee...

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Problems solved by technology

[0004] U.S. Patent 3,780,138 discloses a method for removing residual metal catalysts, which uses oxidant and dilute citric acid aqueous solution and lower aliphatic alcohol to extract metal ions in polymers. This method requires the use of a large amount of extractant, and the extraction time is long. difficult phase separation

The treatment process is complicated, the process is long, and it is easy to cause environmental pollution. In addition, the recovered solvent contains lower aliphatic alcohols that are difficult to remove. The latter will become a chain terminator in the polymerization reaction, which is not good for the polymerization reaction.

[0005] Chinese patent CN1027172C discloses a method for removing residual catalyst from unsaturated polymer hydrogenated glue, which uses oxidant and dibasic acid to remove hydrogenation catalyst, and the solvent used for precipitant is polyalkylene glycol A mixture of ether and water. Although this method has a high removal efficiency for residual catalyst in the polymer, it needs to use filtration separation technology. The separation efficiency of filtration method is low, the operation is complicated, and the filter cloth is easy to block, which has certain limitations.

[0006] Chemical reaction engineering and technology, Zhang Guojuan, Li Chuanqing, etc. described in the reaction series research of SEBS nickel removal, 2012, 28 (3): 275-277, using citric acid method to remove SEBS catalyst in batch or continuous operation mode, batch operation The production efficiency of the method is low; if the continuous operation mode requires a long residence time for the materials in single-pot operation, otherwise the catalyst removal efficiency will be low, and if the multi-pot continuous operation increases the reaction process and operation steps, it is not suitable for industrial production

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