The production method of accelerator n-tert-butyl-2-benzothiazole sulfenamide

Abstract

The present invention relates to the production method of promotor N-tert-butyl-2-benzothiazole sulfenamide, 32.5g promotor M is added in 100ml water, add 2 milliliters concentration again and be 7% and add dispersing agent total 125ml, make up water Or mother liquor to 125ml to make accelerator M slurry, put it in a container for standby; put 100ml of sodium hypochlorite with 18.4-18.6g / 100ml of available chlorine and 0.8-1g / 100ml of free alkali into the container for standby; put tert-butylamine into a 300ml reaction container , the molar ratio of the total amount of tert-butylamine to the total amount of accelerator M is 1.06:1, stir and heat up to 43-45°C; add 5ml of accelerator M slurry as a base material, and then add the accelerator M slurry in step 1) and the sodium hypochlorite in step 2) are added dropwise in a volume ratio of 5:3, and the dropwise addition needs to be completed within 45-55 minutes, and the temperature during the dropping process cannot be higher than 45°C. The invention does not need mother liquor recovery and distillation, reduces waste water discharge, lowers costs, is economical and environmentally friendly, and all technical indicators of the product meet national standards.

Description

technical field [0001] The invention relates to a new method for production of accelerator NS (N-tert-butyl-2-benzothiazole sulfenamide) (abbreviated as TBBS), and belongs to the technical field of rubber accelerator production. Background technique [0002] Accelerator NS (TBBS) is a retardation accelerator, suitable for natural rubber, butadiene rubber, isobutylene rubber, styrene-butadiene rubber and natural rubber reclaimed rubber, and is very safe at operating temperature. At present, the domestic main production methods are sodium hypochlorite oxidation method and hydrogen peroxide oxidation method. Both methods adopt the excessive addition method of tert-butylamine, that is, the quantitative accelerator M (2-mercaptobenzothiazole) and excessive tert-butylamine are put into the reactor, and The accelerator NS is generated under the action of the oxidizing agent, and the molar ratio of the accelerator M and tert-butylamine is generally 1:2.7-3. Due to the excessive amou...

AI Technical Summary

Problems solved by technology

At present, the domestic main production methods are sodium hypochlorite oxidation method and hydrogen peroxide oxidation method. Both methods adopt the excessive addition method of tert-butylamine, that is, the quantitative accelerator M (2-mercaptobenzothiazole) and excessive tert-butylamine are put into the reactor, and The accelerator NS is generated under the action of the oxidizing agent, and the molar ratio of the accelerator M and tert-butylamine is generally 1:2.7-3. Due to the excessive amount of tert-butylamine, the mother liquor needs to be recovered for distillation during post-treatment, which increases the amount of waste water and increases Cost of production

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