CAS number:149-30-4
molecular formula：C7H5NS2
molecular weight：167.25
EINECS number：205-736-8

English synonyms

2-Benzothiazolethiol (MBT);Sulfur Accelerator M;2-mercaptobenzothialole;2-Mercaptobenzothiazole (2-MBT);2-mercaptobenzothiazole(mbt);2-Mercaptobenzthiazole;2-Mercptobenzothiazole;2-Merkaptobenzotiazol

Related categories

Biochemical reagents-other chemical reagents; standard products; heterocyclic building blocks; benzoheterocycles; pharmaceutical and chemical intermediates; biochemical reagents; fine chemicals; thiazoles and their derivatives; copper corrosion inhibitors; organic raw materials; heterocyclic compounds ;Amide herbicides;herbicide intermediates;pesticide intermediates;chemical additives;corrosion inhibitors;water treatment chemicals;electroplating chemicals;organic building blocks;thiazoles;pharmaceutical raw materials;organic chemical raw materials;chemical raw materials;raw materials; RubberChemicals;BENZOTHIAZOLE;Industrial/FineChemicals;Sulfurcompounds;SulphurDerivChemicalbookatives;Organics;Coppercorrosioninhibitor;C3toC7;BuildingBlocks;ChemicalSynthesis;HeterocyclicBuildingBlocks;Thiazoles;UltraPureMALDIMatrices;rubberaccelerator; Raw materials-catalysts;chemical reagents;chemical products-organic chemicals;chemicals;inorganic chemicals;chemicals

Introduction

2-Mercaptobenzothiazole, also known as accelerator M, is an organic compound with the chemical formula C7H5NS2, a pale yellow crystalline powder, mainly used for the determination of gold, bismuth, cadmium, cobalt, mercury, nickel, lead, thallium and Zinc sensitive reagent and rubber accelerator.

Chemical properties

Pale yellow monoclinic needles or flake crystals with unpleasant odor. Insoluble in water and gasoline, soluble in ethanol, ether, acetone, ethyl acetate, benzene, chloroform and dilute lye.

Use

●  Used as a sensitive reagent and rubber accelerator for the determination of gold, bismuth, cadmium, cobalt, mercury, nickel, lead, thallium and zinc

●  Mainly used in the manufacture of tires, inner tubes, tapes, rubber shoes and other industrial rubber products

●  This product is one of the effective corrosion inhibitors for copper or copper alloy. When the cooling system contains copper equipment and raw water contains a certain amount of copper ions, this product can be added to prevent copper corrosion.

●  2-Mercaptobenzothiazole is an intermediate of the herbicide fenthiofen, as well as a rubber accelerator and its intermediate.

●  Mainly used as brightener for bright copper sulfate. Has a good leveling effect. The general dosage is 0.05～0.10g/L. It can also be used as a brightening agent for silver cyanide plating. After adding 0.5g/L, the polarization degree of the cathode is increased, and the crystals of silver ions are oriented and arranged to form a bright silver plating layer.

●  As a general-purpose vulcanization accelerator, this product is widely used in various rubbers. Fast acceleration for natural rubber and synthetic rubbers, usually vulcanized with sulfur. However, it needs to be activated by zinc oxide, fatty acid, etc. Often used in combination with other accelerator systems, such as dithiothiuram and tellurium dithiocarbamate, it can be used as an accelerator for butyl rubber; when used in combination with tribasic lead maleate, it can be used for light-colored water resistance chlorosulfonated polyethylene compound. It is often used in combination with dithiocarbamate in latex, and when used in combination with diethylamine diethyldithiocarbamate, it can be vulcanized at room temperature. The product is easy to disperse in rubber and does not pollute. However, due to its bitter taste, it is not suitable for use in food contact rubber products. Accelerator M is an intermediate of accelerators MZ, DM, NS, DIBS, CA, DZ, NOBS, MDB, etc., 2-mercaptobenzothiazole with 1-amino-4-nitroanthraquinone and potassium carbonate in dimethyl Reflux in formamide for 3h, the dye disperse brilliant red S-GL (C.I.DisperseRed121) can be obtained. This dye is used for the dyeing of Chemicalbook polyester and its blends. When 2-mercaptobenzothiazole is used as an electroplating additive, it is also called an acid copper plating brightener M, and is used as a brightening agent for bright copper plating with copper sulfate as the main salt. In addition, the product is also used to prepare pesticides and fungicides, nitrogen fertilizer synergists, cutting oils and lubricant additives, organic anti-ashing agents in photographic chemistry, metal corrosion inhibitors, etc. In addition, it is a reagent for chemical analysis. The product is low in toxicity and has an irritating effect on the skin and mucous membranes.

●  Rubber accelerator MBT(M).

●  It is a general-purpose accelerator, mainly used in tires, rubber shoes, tapes and other rubber products. Due to its bitter taste, it cannot be used in rubber products for food packaging

●  Mainly used as a solvent for polyurethane synthetic leather, amino acid synthetic leather, resin vegetable oil, mineral oil, medicine, paint and dyestuff, as a stabilizer for 1,1,1-trichloroethane, and also as a plasticizer, antioxidant, etc.

●  WangYao is used in IR, NR, SBR, NBR, HR and EPOM systems. It is currently a main acidic vulcanizing agent with moderate vulcanization speed. It can be used in combination with other vulcanizing agents such as WILLINGDM and WILLINGTMTD and other basic vulcanizing agents to achieve higher activity. Its vulcanization temperature is low, it is easy to disperse in rubber, and it does not pollute. It is mainly used in the manufacture of tires, tapes, rubber shoes and other industrial rubber products, but cannot be used as food materials.

●  Tests for bismuth, cobalt, copper, gold, lead, mercury, nickel, thallium and zinc. Gravimetric determination of silver, cadmium, iridium, lead, platinum and rhodium. Photometric analysis for the determination of selenium and tellurium. Volumetric analysis determines silver. Rubber Vulcanization Accelerator Use Test bismuth, cobalt, copper, gold, lead, mercury, nickel, thallium and zinc. Determination of silver, cadmium, iridium, lead, platinum and rhodium. Photometric analysis for the determination of selenium and tellurium. Volumetric analysis determines silver. Rubber vulcanization accelerator.

●  Used as a rubber accelerator; used as an intermediate for cephalosporins and other drugs

Production method

●  There are many production methods for this product, but there are mainly three methods using aniline, o-nitrochlorobenzene and diphenylthiourea as raw materials. 1. Using aniline as the raw material, aniline, carbon disulfide and sulfur are usually reacted directly in the autoclave, and aliphatic amine, dimethylformamide, trithiazolidine and polyformaldehyde can also be used to replace carbon disulfide, so that under the pressure of aniline and sulfur, reaction. The method using aniline as the raw material has a high reaction pressure, generally above 4MPa, and as high as 15MPa, so it is also called high pressure method. 2. Using o-nitrochlorobenzene as raw material, o-nitrochlorobenzene can be reduced to o-aminothiophenol by reaction with reducing agent sodium hydrosulfide, sodium polysulfide or hydrogen sulfide. Accelerator M is prepared by further reacting with carbon disulfide. Some of these methods have a longer reaction time (about 20h for sodium hydrosulfide), but they can all be carried out at normal pressure or lower pressure, also known as normal pressure method. 3. Using diphenylthiourea as raw material, the reaction pressure of this method is between the above two methods, below 4MPa, which is generally called the medium pressure method.

●  See Water Treatment Agent 03301.

●  The preparation method takes o-chloronitrobenzene, sodium polysulfide and Chemicalbook carbon disulfide as raw materials, reacts at a temperature of 110 to 130 DEG C and a pressure of 343 kPa to generate 2-mercaptobenzothiazole sodium salt, and then uses sulfuric acid to acidify and wash with water to obtain the product. . It can also be reacted with aniline, carbon disulfide and sulfur at about 200 ° C, and then kept at a pressure of 7.85 MPa and 250 ~ 260 ° C for 2.5 hours to obtain 2-mercaptobenzothiazole, which is dissolved in sodium hydroxide to form a sodium salt, and then acidified to pH=9, filtered, the filtrate was acidified and neutralized at 38-40°C, washed with water, and dried to obtain the product.

●  Add aniline, carbon disulfide and sulfur to the condensation kettle in turn. The feeding ratio is (mol): 1:0.96:0.36. Heated to about 260°C under 8.1MPa. The condensation reaction ended after 2h. 2-mercaptobenzothiazole crude product was obtained. Cool down and transfer it to the neutralization kettle. Add 7～8°Bé lye to neutralize, filter, discard impurities, transfer the filtrate into acidification kettle, add 10°Bé sulfuric acid to acidify to pH 6～7. Filter, wash the filter cake twice with water, dry, pulverize, sieve and pack to get the finished product

Team Presentation