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A kind of preparation method of rubber accelerator diethyldithiocarbamate selenium

A technology of diethyldithiocarbamic acid and rubber accelerator, applied in the direction of organic chemistry, etc., to achieve the effects of simple operation, avoidance of waste water and short reaction time

Active Publication Date: 2021-02-23
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a congener element of tellurium, selenium has similar electronic structure and chemical properties with tellurium. The price of selenium oxide currently available on the market is much lower than that of tellurium oxide, and the reactivity of selenium is also greater than that of tellurium. Therefore, diethyl disulfide Selenium substituted carbamate (SEDC) is a promising accelerator, but there is no literature or patent report on the synthesis of selenium diethyldithiocarbamate

Method used

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  • A kind of preparation method of rubber accelerator diethyldithiocarbamate selenium
  • A kind of preparation method of rubber accelerator diethyldithiocarbamate selenium
  • A kind of preparation method of rubber accelerator diethyldithiocarbamate selenium

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Effect test

Embodiment 1

[0038] Dissolve 5.548g of selenium oxide (0.05mol) in 100mL of absolute ethanol under 300rpm stirring condition, then add 20.56mL of diethylamine (0.2mol), control the reaction temperature at 8°C, and stir for 20min to obtain solution A; Mix mL of carbon disulfide (0.2mol) with 13 mL of ethylene glycol, stir to make it evenly mixed to obtain a mixture, add 25.06 mL of the mixture dropwise to 120.56 mL of solution A, and keep warm for 2 hours after the addition; The rubber accelerator selenium diethyldithiocarbamate is obtained by drying, pulverizing and sieving. The yield of the obtained product is 89.5%, the melting point of the product is 111°C, and the decomposition temperature is 193°C.

Embodiment 2

[0040] Dissolve 5.548g of selenium oxide (0.05mol) in 150mL of absolute ethanol under 300rpm stirring condition, then add 25.7mL of diethylamine (0.25mol), control the reaction temperature at 8°C, stir for 20min to obtain solution A; Mix mL of carbon disulfide (0.25mol) with 16 mL of dimethyl sulfoxide, stir to make it evenly mixed to obtain a mixture, add 28.08 mL of the mixture dropwise to 175.7 mL of solution A, and keep warm for 2 hours after the addition; The rubber accelerator selenium diethyldithiocarbamate is obtained by filtering, drying, pulverizing and sieving. The yield of the obtained product is 91.3%, the melting point of the product is 113°C, and the decomposition temperature is 193°C.

Embodiment 3

[0042] Dissolve 5.548g of selenium oxide (0.05mol) in 150mL of absolute ethanol under 300rpm stirring condition, then add 30.84mL of diethylamine (0.3mol), control the reaction temperature at 8°C, and stir for 20min to obtain solution A; Mix mL of carbon disulfide (0.3mol) with 19 mL of ethyl acetate, stir to make it evenly mixed to obtain a mixture, add 31.09 mL of the mixture dropwise to 180.84 mL of solution A, and keep warm for 2 hours after the addition; The rubber accelerator selenium diethyldithiocarbamate is obtained by drying, pulverizing and sieving. The yield of the obtained product is 88.4%, the melting point of the product is 112°C, and the decomposition temperature is 192°C.

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Abstract

The invention relates to the field of rubber vulcanization accelerators, in particular to a preparation method of a rubber accelerator selenium diethyldithiocarbamate. The present invention specifically comprises the following steps: dissolving selenium oxide in an organic solvent under stirring conditions, then adding diethylamine, controlling the reaction temperature at 0-20°C, and stirring for 20-30 minutes to obtain solution A; mixing carbon disulfide with a polarity greater than The organic solvent of 2 is mixed, stirred to make it evenly mixed to obtain a mixture, the mixture is added to solution A, and after the addition is completed, the heat preservation reaction is carried out; after the reaction is completed, the rubber accelerator II is obtained by suction filtration, drying, pulverization, and sieving. Selenium ethyl dithiocarbamate. The invention is environment-friendly and pollution-free, has low cost, and has better vulcanization acceleration effect than existing accelerators.

Description

technical field [0001] The invention relates to the field of rubber vulcanization accelerators, in particular to a preparation method of a rubber accelerator selenium diethyldithiocarbamate. Background technique [0002] Vulcanization is the last and most important step in the production process of rubber products. In this step, the rubber and the vulcanizing agent undergo a series of cross-linking reactions, so that the rubber forms macromolecules with a three-dimensional network structure from linear macromolecules, thus showing the unique high elastic properties of rubber elastomers and Excellent mechanical and other physical and chemical properties. [0003] Rubber vulcanization accelerator is a general term for substances that can accelerate the vulcanization speed of rubber, shorten the vulcanization time, and reduce the amount of vulcanizing agent in rubber without reducing the physical and mechanical properties of rubber. Dithiocarbamate accelerators were first stu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C391/00
CPCC07C391/00
Inventor 朱立新侯玙杰吴良辉余翀石川
Owner SOUTH CHINA UNIV OF TECH
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