Preparation method of rubber plasticizer dioctyl sebacate

Abstract

The invention discloses a preparation method of a rubber plasticizing agent dioctyl sebacate. The method includes the following steps: 1, adding sebacic acid, 2-ethyl hexanol and a catalyst stannous oxide into a four-neck flask equipped with a thermometer, a reflux distributor and an agitator, introducing nitrogen, and conducting esterification reaction under 200 DEG C-230 DEG C; 2, after the reaction, cooling to 90 DEG C, adding lye water for neutralization, washing, standing for layering, releasing lye water, conducting reduced pressure distillation, and finally add activated carbon for adsorption and filleting to obtain the dioctyl sebacate product. The preparation method provided by the invention employs a non-solid acid catalyst stannous oxide for catalytic synthesis of dioctyl sebacate, and has the advantages of high catalytic activity, short reaction time, small amount of catalyst, light color of the obtained product, simple post treatment process, no corrosion of the catalyst on the equipment, no waste liquid produced, green, and environment-friendliness.

Description

[0001] technical field [0002] The invention relates to a method for preparing a rubber plasticizer, in particular to a method for preparing dioctyl sebacate. [0003] Background technique [0004] Dioctyl sebacate is a typical cold-resistant plasticizer, suitable for polyvinyl chloride, vinyl chloride copolymer, nitrocellulose, ethyl cellulose and synthetic rubber. High plasticizing efficiency, low volatility, excellent cold resistance, good heat resistance, light resistance and electrical insulation, and good lubricity when heated, making the product appearance and feel good, especially suitable for Used in the production of cold-resistant wire and cable materials, artificial leather, film, plate, sheet, etc. At present, the production process mostly uses concentrated sulfuric acid as a catalyst, and esterification is carried out under reduced pressure. Because sulfuric acid is prone to cause more side reactions at higher temperatures, resulting in darker product color,...

AI Technical Summary

Problems solved by technology

At present, the production process mostly uses concentrated sulfuric acid as a catalyst, and esterification is carried out under reduced pressure. Because sulfuric acid is prone to cause more side reactions at higher temperatures, resulting in darker product color, complex post-treatment procedures, and large wastewater discharge , Moreover, the equipment is severely corroded, and at the same time, a large amount of waste liquid is produced to pollute the environment