Good quality 2-Mercaptobenzimidazole CAS 583-39-1
Basic Info
Model No.: CAS NO 583-39-1
Product Description
Good quality 2-Mercaptobenzimidazole CAS 583-39-1
production method
1. Preparation of o-Nitroaniline The molten o-nitrochlorobenzene was sucked into the autoclave, and then 28% of ammonia water was added. The temperature was increased to 170-175° C., and the reaction was stirred for 7 hours. The pressure was 3.5-4 MPa. After the completion of the reaction, ammonia is released and pressure is reduced, and ammonia is cooled and absorbed to produce ammonia water for recycling. When the temperature in the autoclave drops to 100°C, the pressure in the autoclave is reduced to 1000 liters of water prepared in the coagulation tank by using the residual pressure. Cooled to below 30 °C, filtered, filter cake washed with a small amount of cold water, namely o-nitroaniline. The yield is 95% to 96%.
2. Preparation of antioxidant MB In the reduction tank, add o-nitroaniline and 21% sodium sulfide solution, raise the temperature to 90 °C, and then seal the temperature to 105 ~ 110 °C, the pressure is self-elevation to 0.1 ~ 0.2MPa, stirring and reduction 5h After cooling to below 30°C, carbon disulfide was added to carry out the reaction. The temperature was kept at about 40°C. After a few hours of reaction, the temperature was raised to recover carbon disulfide. Then put a proper amount of sodium bicarbonate solution, add activated carbon to decolorize and filter, the filtrate is acidified with dilute hydrochloric acid or dilute sulfuric acid, 2-mercaptobenzimidazole is precipitated as solid. After centrifugation, washing, drying and crushing, the finished product is obtained.
3. 64 kg of o-phenylenediamine, 18 kg of potassium hydroxide, and 52 kg of carbon disulfide were sequentially added to the reactor. The stirring was started, 480 kg of alcohol was added, and 190 kg of distilled water was slowly heated to dissolve it, followed by heating and refluxing for 3 h. Cooling, stop boiling, add 24kg activated carbon reflux for 20min, decolorize. Then the activated carbon was removed by filtration. The filtrate was placed in a crystallization bath, heated to 60-70°C, and heated to 300 parts. Aqueous acetic acid (30% to 32%) was added with stirring to complete the crystallization. Centrifugal filtration, collecting crystals in 4...
use
The product is used as an antioxidant for natural rubber, diene synthetic rubber and latex, and also for polyethylene. It is a so-called secondary antioxidant that can be used in combination with other antioxidants (such as DNP, AP, and other non-polluting antioxidants) to achieve significant synergistic effects. The product is easy to disperse in rubber and does not change color under sunlight. Slightly polluting. When used alone, the amount is 1-1.5 parts. When the amount is more than 2 parts, the frost phenomenon will occur. The amount used in the latex foam rubber is 0.5-1 parts, and the amount used in the transparent rubber product is 0.5 parts. Because this product is bitter, it should not be used in rubber products that come in contact with food. 2-Mercaptobenzimidazole is a new drug against leprosy in medicine. Its toxicity is lower than that of sulfone, but its efficacy is also at the end. It can produce drug resistance without accumulation effect. Can be used in patients who do not apply sulfone drugs. The 2-mercaptoimidazolium alkali metal salt aqueous solution reacts with the water-soluble zinc salt solution to obtain the 2-mercaptobenzimidazole zinc salt, namely the antioxidant MBZ (C14H10N4S2Zn). The product is non-toxic.
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Services
1.Cooperate with research institutions, we strictly control the process from raw material to finished product.
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5.Warm after sale service, we will help to solve the problems in your usage.
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Product expansion
1> Cosmetic Raw Materials: Cosmetics is a variety of raw materials through a reasonable deployment of processing from the compound mixture. Cosmetics with a wide range of raw materials, different performance. According to the raw material properties and uses of cosmetics, can be divided into matrix materials and auxiliary raw materials in two categories. The former is a class of cosmetics in the main raw materials, cosmetics in the possession of a large proportion of the cosmetics play a major role in the role of the material. The latter is the formation of cosmetics, stability or to give color, smell and other characteristics of the role of these substances in the cosmetic formula is not used, but it is extremely important. Cosmetics are natural, synthetic or extracted from the role of different substances as raw materials, by heating, mixing and emulsification and other production processes processed from the chemical mixture.
2> Active Pharmaceutical Ingredients(API): API refers to the raw materials in the production of various types of preparations, which is the active ingredient in powder,crystal and paste for medicine use through chemical synthesis,plant extract, and preparations of biotechnology institute.It is one substance or mixture during the medicine making period uut it can not be taken directly by patients.
3> Fragrance And Spices: Spice is a substance that can be scented by smelling or scented by taste, and is the raw material for the preparation of the fragrance. Spices are an important part of fine chemicals, it is composed of natural spices, synthetic spices and single fragrance.
4> Organic Raw Material: Intermediates are also known as organic intermediates. The use of coal tar or petroleum products as raw materials to produce dyes, pesticides, pharmaceuticals, resins, additives, and other intermediates.
5> Chemicals Used In Paints: Paint, the traditional Chinese name is paint. So-called coating is coated on the surface of the object that be protected or be adornment, and with the continuous film coating to form strong adhesion, usually in resin, or oil, or emulsion is given priority to, add or not add pigment, filler, add the corresponding additives, organic solvents or water preparation of viscous liquid.
Product Categories : Quaternary Ammonium Salts