accelerator ns
N-tert-butylbenzothiazole-2-sulphenamide
CAS: 95-31-8
Molecular Formula: C11H14N2S2
accelerator ns - Names and Identifiers
accelerator ns - Physico-chemical Properties
| Molecular Formula | C11H14N2S2 |
| Molar Mass | 238.37 |
| Density | 1,29 g/cm3 |
| Melting Point | 105°C |
| Boling Point | 344.1±25.0 °C(Predicted) |
| Flash Point | 165°C |
| Vapor Presure | 6.72E-05mmHg at 25°C |
| BRN | 158370 |
| pKa | 1.25±0.70(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Refractive Index | 1.5500 (estimate) |
| Physical and Chemical Properties | Chemical properties light yellow brown powder. Soluble in benzene, dichloromethane, carbon tetrachloride, ethyl acetate, acetone, ethanol, soluble in gasoline, insoluble in water. |
| Use | Uses This product is a natural rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and reclaimed rubber aftereffect accelerator, especially suitable for carbon black rubber with strong alkaline content. It is safe at operating temperature, strong scorch resistance, fast vulcanization speed, high constant elongation strength, and can improve the use ratio of synthetic rubber. Low toxicity and high efficiency, it is an ideal substitute for NOBS, has excellent comprehensive performance, and is called a standard accelerator. Widely used in the production of radial tires. It can be used with aldehydes, guanidines, and thiuram accelerators, and when combined with anti-scorch agent PVI, it forms a good vulcanization system. Mainly used in the manufacture of tires, rubber shoes, rubber hoses, tapes, and cables. |
accelerator ns - Risk and Safety
| Risk Codes | R43 - May cause sensitization by skin contact R53 - May cause long-term adverse effects in the aquatic environment |
| Safety Description | S36 - Wear suitable protective clothing. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S37 - Wear suitable gloves. S24 - Avoid contact with skin. |
| UN IDs | 3077 |
| RTECS | DL6200000 |
| TSCA | Yes |
| HS Code | 29342000 |
| Hazard Class | 9 |
| Packing Group | III |
accelerator ns - Upstream Downstream Industry
| Raw Materials | FUMING SULFURIC ACID Sodium chlorate tert-Butylamine 2-Mercaptobenzothiazole hypochlorous acid 2,2'-Dithiobis(benzothiazole) |
accelerator ns - Nature
| BRN | 158370 |
| NIST chemical information | 2-Benzothiazolesulfenamide, n-(1,1-dimethylethyl)-(95-31-8) |
| EPA chemical information | N-tert-Butyl-2-benzothiazolesulfenamide (95-31-8) |
Last Update：2024-04-10 22:29:15
accelerator ns - Uses and synthesis methods
Introduction
N-tert-butyl -2-benzothiazolimesulfonamide is a commonly used aftereffect accelerator. It is very safe at operating temperature, has good scorch resistance, and has high constant elongation strength, which can improve the use of synthetic glue proportion.
application
N-tert-butyl-2-benzothiazolimesulfonamide is an amine organic substance, which can increase the amount of filler carbon black. It is called "standard accelerator" and is currently the dominant type of sulfamide vulcanization accelerator One of the varieties is mainly used in natural rubber, cis-butadiene rubber, styrene butadiene rubber, isoprene rubber.
production method
It is obtained by the reaction of the sodium salt of 2-thiobenzothiazole (accelerator M) with tert-butylamine. Slowly add 0.75mol of tert-butylamine to 0.5mol of sodium salt solution of 13% accelerator M, add 0.36mol of 25% sulfuric acid solution after half an hour, and react at 45-50 ℃ for 0.5h. 0.6mol 15% sodium hypochlorite was added within 2 hours. After the reaction, it is cooled, filtered, washed, and dried below 50°C to obtain the product.
category
Toxic substances
Toxicity classification
low toxicity
Acute toxicity
oral-rat LDL0: 7940 mg/kg; Abdominal-mouse LD50: 5000 mg/kg
flammability hazard characteristics
Thermal decomposition discharges toxic nitrogen oxides and sulfur oxide smoke
storage and transportation features
Warehouse ventilation and low temperature drying
Fire extinguishing agent
Water, dry powder, dry sand, carbon dioxide, foam, 1211 fire extinguishing agent
Last Update：2024-04-09 01:59:50
accelerator ns - Security information
| toxic substance data | 95-31-8(Hazardous Substances Data) |
Last Update：2024-04-09 20:48:19
accelerator ns - Reference Information
| introduction | N-tert-butyl -2-benzothiazolimesulfonamide is a commonly used aftereffect accelerator, which is very safe at operating temperature, good scorch resistance, high elongation strength, and can improve the use ratio of synthetic glue. |
| application | N-tert-butyl -2-benzothiazole sulfamide is an amine organic substance, which can increase the dosage of filler carbon black and is called "standard accelerator". it is one of the leading varieties of sulfonic amide vulcanization accelerator at present and is mainly used in natural rubber, butadiene rubber, styrene butadiene rubber and isoprene rubber. |
| chemical properties | light yellow brown powder. Soluble in benzene, dichloromethane, carbon tetrachloride, ethyl acetate, acetone, ethanol, soluble in gasoline, insoluble in water. |
| use | used as aftereffect accelerator, suitable for reclaimed rubber of natural rubber, cis-butyl, styrene-butadiene, isoprene rubber and natural rubber aftereffect accelerator. It can be used for reclaimed rubber of natural rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and natural rubber. The use method and properties are basically similar to the accelerator CZ, but the aftereffect is slightly greater in natural gum. The product needs to be supplemented with zinc oxide and stearic acid, and can also be activated by thiuram, dithiocarbamate, aldehydes, guanidine promoters and acidic substances. The pollution is slight and there is almost no discoloration. In the total consumption of accelerators, M and DM are the largest in China, and CZ (2900t in 1990) is the third. The accelerant NOBS has developed rapidly in recent years, from 655t in 1985 to 1305t in 1990. These varieties are derivatives of accelerator M. At present, the main problem that plagues the vulcanization accelerator industry is the carcinogenicity of nitrosamines. NOBS and other secondary amine structure accelerators can produce nitrosamines that are carcinogenic to animals during vulcanization, while primary amine structure hypesulfonamide vulcanization accelerators such as NS and CZ have no carcinogenicity problem and have received widespread attention. NS in the United States has the largest production and consumption, accounting for 40% of the total amount of thiazole vulcanization chemicals (including vulcanizing agents and vulcanization accelerators). The rapid development of radial tires in China has more urgent requirements for the matching of accelerator NS, but the domestic production of tert-butylamine has not formed a scale, which has affected the industrial production of accelerator NS. Aftereffect accelerator. It can be used for reclaimed rubber of natural rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and natural rubber. The use method and properties are basically similar to the accelerator CZ, but the aftereffect is slightly greater in natural gum. The product needs to be supplemented with zinc oxide and stearic acid, and can also be activated by thiuram, dithiocarbamate, aldehydes, guanidine promoters and acidic substances. The pollution is slight and there is almost no discoloration. In the total consumption of accelerators, M and DM are the largest in China, and CZ (2900t in 1990) is the third. The accelerant NOBS has developed rapidly in recent years, from 655t in 1985 to 1305t in 1990. These varieties are derivatives of accelerator M. At present, the main problem plaguing the vulcanization accelerator industry is the carcinogenicity of nitrosamines. NOBS and other secondary amine structure accelerators can produce nitrosamines that are carcinogenic to animals during vulcanization, while primary amine structure sulfenamide vulcanization accelerators such as NS and CZ have no carcinogenicity problem and have received widespread attention. NS in the United States has the largest production and consumption, accounting for 40% of the total amount of thiazole vulcanization chemicals (including vulcanizing agents and vulcanization accelerators). The rapid development of radial tires in China has more urgent requirements for the matching of accelerator NS, but the domestic production of tert-butylamine has not formed a scale, which has affected the industrial production of accelerator NS. this product is a natural rubber, butadiene rubber, isoprene rubber, styrene butadiene rubber and reclaimed rubber aftereffect accelerator, especially suitable for carbon black rubber with strong alkaline content. It is safe at operating temperature, strong scorch resistance, fast vulcanization speed, high constant elongation strength, and can improve the use ratio of synthetic rubber. Low toxicity and high efficiency, it is an ideal substitute for NOBS, has excellent comprehensive performance, and is called a standard accelerator. Widely used in the production of radial tires. It can be used with aldehydes, guanidines, and thiuram accelerators, and when combined with anti-scorch agent PVI, it forms a good vulcanization system. Mainly used in the manufacture of tires, rubber shoes, rubber hoses, tapes, and cables. |
| Production method | The sodium salt of 2-thiobenzothiazole (accelerator M) reacts with tert-butylamine. Slowly add 0.75mol of tert-butylamine to 0.5mol of sodium salt solution of 13% accelerator M, add 0.36mol of 25% sulfuric acid solution after half an hour, and react at 45-50 ℃ for 0.5h. 0.6mol 15% sodium hypochlorite was added within 2 hours. After the reaction, it is cooled, filtered, washed, and dried below 50°C to obtain the product. |
| category | toxic substances |
| toxicity classification | low toxicity |
| acute toxicity | oral administration-rat LDL0: 7940 mg/kg; Abdominal cavity-mouse LD50: 5000 mg/kg |
| flammability hazard characteristics | thermal decomposition to discharge toxic nitrogen oxides, sulfur oxide smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | water, dry powder, dry sand, carbon dioxide, foam, 1211 fire extinguishing agent |
| NIST chemical information | The information is: webbook.nist.gov provides (external link) |
| EPA chemical information | The information is: ofmpub.epa.gov provides (external link) |
| toxic substance data | The information is: pubchem.ncbi.nlm.nih.gov Provide (external link) |
Last Update：2024-04-09 20:45:29
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View History
Raw Materials for accelerator ns
FUMING SULFURIC ACID
Sodium chlorate
tert-Butylamine
2-Mercaptobenzothiazole
hypochlorous acid
2,2'-Dithiobis(benzothiazole)
Sodium chlorate
tert-Butylamine
2-Mercaptobenzothiazole
hypochlorous acid
2,2'-Dithiobis(benzothiazole)