Accelerator M is a light yellow or yellow powder, bitter in taste and non-toxic.

Accelerator DM is a light yellow or white powder that is irritating to breathing and skin.

Main uses: tires, rubber shoes, cables and other industrial products.

M:

Property description: Light yellow monoclinic needle-shaped or leaf-shaped crystal. Melting point 180.2-181.7℃, relative density 1.42. Solubility at 25℃ (g/100ml): ethanol 2.0, diethyl ether 1.0, acetone 10.0, benzene 1.0, carbon tetrachloride lt; 0.2. Still soluble in glacial acetic acid, soluble in alkali and carbonate alkali solutions, insoluble in water. It has a bitter taste and an unpleasant odor.

Production methods: 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 raw material usually reacts aniline, carbon disulfide and sulfur directly in an autoclave. Fatty amines, dimethylformamide, trithiazolidine and formaldehyde can also be used instead of carbon disulfide to make aniline and sulfur under pressure. reaction. The reaction pressure of the method using aniline as raw material is relatively high, generally above 4MPa, and as high as 15MPa, so it is also called the high-pressure method. 2. Using o-nitrochlorobenzene as raw material, o-nitrochlorobenzene reacts with the reducing agent sodium hydrosulfide; sodium polysulfide or hydrogen sulfide can be reduced to o-aminothiophenol. It further reacts with carbon disulfide to prepare accelerator M. Some of these methods have longer reaction times (sodium hydrosulfide takes about 20 hours), but they can all be carried out under normal pressure or lower pressure, also known as the normal pressure method. 3. Using diphenylthiourea as the raw material, the reaction pressure of this method is between the two aforementioned methods, below 4MPa, and is generally called the medium pressure method.

Usage: As a general vulcanization accelerator, this product is widely used in various rubbers. It has a rapid accelerating effect on natural rubber and synthetic rubber usually vulcanized with sulfur. But its use requires zinc oxide; fatty acid and other activation. Often used in combination with other accelerator systems, such as thiuram dithiocarbamate and tellurium dithiocarbamate, it can be used as an accelerator for butyl rubber; it can be used with tribasic lead maleate for light-colored, water-resistant applications. of chlorosulfonated polyethylene rubber. It is often used together with dithiocarbamates in latex, and when used together with diethyldithiocarbamate diethylamine, it can be vulcanized at room temperature. This product is easily dispersed 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 accelerator MZ, DM, NS, DIBS, CA, DZ, NOBS, MDB, etc., 2-mercaptobenzothiazole and 1-amino-4-nitroanthraquinone and potassium carbonate in dimethyl Reflux in formamide for 3 hours to prepare the dye disperse red S-GL (C.I.Disperse Red 121). This dye is used for dyeing polyester and its blended fabrics. 2-Mercaptobenzothiazole is also called acidic copper plating brightener M when used as an electroplating additive. It is used as a spreading aid brightener in bright copper plating with copper sulfate as the main salt. In addition, this product is also used to prepare pesticides and fungicides; nitrogen fertilizer synergists; cutting oil and lubricating additives; organic anti-ashing agents in photographic chemistry; metal corrosion inhibitors, etc. In addition, it is a reagent for chemical analysis. This product has low toxicity and is irritating to skin and mucous membranes.

DM:

Chemical name dibenzothiazole disulfide (accelerator DM)

Molecular formula C14H8N2S4

1. Technical indicators GB 11408-89

High-quality first-class qualified product

Appearance (visual inspection) White or light yellow powder or granular form

Initial melting point ℃ ≥ 170.0 165.0 160.0

Heating loss ≤ 0.30 0.40 0.50

Ash ≤ 0.30 0.50 0.70

Screen residue (150μm) ≤ - 0.10 0.10

2 , white or light yellow powder, bitter and non-toxic, insoluble in water, soluble in alcohol, ether, etc.

3. Use as a general accelerator for natural rubber, synthetic rubber and reclaimed rubber. Its critical vulcanization temperature is relatively high (130°C), and its activity increases above 140°C. It has significant aftereffects and is safe to operate. It can be used as a retardant and plasticizer in G-type chloroprene rubber, and as a vulcanization modifier in W-type chloroprene rubber. When used in latex, the vulcanization speed is slow, but it can reduce the tendency of early vulcanization of EZ latex materials containing accelerator. This product is easily dispersed in rubber materials and does not pollute, but it has a bitter taste and is not suitable for use in products that come into contact with food. It is mainly used in the manufacture of tires, hoses, tapes, rubber shoes, tapes and general industrial products. It is also used in white and light-colored products. products.