Special composite heat stabilizer for polyvinyl chloride cards and preparation method of special composite heat stabilizer

Abstract

The invention relates to a special composite heat stabilizer for polyvinyl chloride cards. The special composite heat stabilizer comprises 70-98 parts of methyl tin mercaptide, 1-30 parts of nitrate plasticizers, 0.1-5 parts of a lubrication agent and 0.01-1 part of an ultraviolet light absorber. With the adoption of the special composite heat stabilizer, the plasticization performance of polyvinyl chloride is improved in the processing process, the temperature and the energy consumption are reduced, and consumption of the heat stabilizer is reduced; the lubrication performance of a polyvinyl chloride melt is improved, the use cycle of equipment is prolonged, the heat staying time of the melt is reduced, and consumption of the heat stabilizer is reduced; the stabilizer is not prone to discoloring and deterioration under light and can be conveniently transported and stored; the oil resistance, the light resistance and the mildew resistance of polyvinyl chloride products are improved; the content of tin in the heat stabilizer containing methyl tin mercaptide is reduced, and the consumption of rare metal tin is reduced; the addition quantity and the cost of the heat stabilizer containing methyl tin mercaptide are reduced; the special composite heat stabilizer is easy to prepare and can be conveniently popularized and applied in industry, and the processing cost is low.

Description

technical field [0001] The invention belongs to the field of processing aids, in particular to a compound thermal stabilizer specially used for polyvinyl chloride cards. Background technique [0002] Polyvinyl chloride is an amorphous high polymer with a plasticizing temperature of 150-170°C and a processing temperature of 160-200°C. Its molecular structure is extremely unstable to heat, and it slightly degrades at 100°C in air. The degradation intensifies at 150°C, releasing hydrogen chloride gas, and hydrogen chloride will promote the degradation of polyvinyl chloride. If the production of hydrogen chloride is not suppressed, the decomposition will be further intensified. Due to the special structure of polyvinyl chloride, it will inevitably decompose at the processing temperature, making the product darker, reducing its physical and mechanical properties, and even losing its use value. Heat stabilizers are developed and produced to solve this problem. According to diffe...

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Problems solved by technology

And take methyl tin mercaptide, citric acid ester as the nontoxic compound heat stabilizer that main component forms, do not see report