aapirol
Tetramethylthiuram disulfide
CAS: 137-26-8
Molecular Formula: C6H12N2S4
aapirol - Names and Identifiers
aapirol - Physico-chemical Properties
| Molecular Formula | C6H12N2S4 |
| Molar Mass | 240.43 |
| Density | 1.43 |
| Melting Point | 156-158°C(lit.) |
| Boling Point | 129 °C (20 mmHg) |
| Flash Point | 89°C |
| Water Solubility | 16.5 mg/L (20 ºC) |
| Solubility | 0.0184g/l |
| Vapor Presure | 8 x 10-6 mmHg at 20 °C (NIOSH, 1997) |
| Appearance | solid |
| Exposure Limit | NIOSH REL: TWA 0.5 mg/m3, IDLH 100 mg/m3; OSHA PEL: 0.5mg/m3; ACGIH TLV: TWA 5 mg/m3. |
| Merck | 14,9371 |
| BRN | 1725821 |
| pKa | 0.87±0.50(Predicted) |
| Storage Condition | under inert gas (argon) |
| Refractive Index | 1.5500 (estimate) |
| Physical and Chemical Properties | Density 1.43 melting point 155-158°C boiling point 129°C (20 mmHg) water-soluble 16.5 mg/L (20°C) |
| Use | For rice, wheat, tobacco, sugar beet, grape and other crop pest control, can be used for seed dressing, soil treatment |
aapirol - Risk and Safety
| Risk Codes | R20/22 - Harmful by inhalation and if swallowed. R36/38 - Irritating to eyes and skin. R43 - May cause sensitization by skin contact R48/22 - Harmful danger of serious damage to health by prolonged exposure if swallowed. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37 - Wear suitable protective clothing and gloves. S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 2771/2811 |
| WGK Germany | 3 |
| RTECS | JO1400000 |
| TSCA | Yes |
| HS Code | 29303000 |
| Hazard Class | 9 |
| Packing Group | III |
| Toxicity | LD50 orally in rats: 640 mg/kg (Gaines) |
aapirol - Upstream Downstream Industry
aapirol - Introduction
This standard substance is mainly used for measuring instrument calibration, analytical method evaluation and quality control, as well as the content determination and residue detection of corresponding components in related fields such as food, hygiene, environment and agriculture. It can also be used for value traceability or as a standard liquid reserve solution. It is diluted step by step and configured into various standard solutions for work. 1. Sample Preparation This standard substance is made of thiram double pure product with accurate purity and fixed value as raw material, chromatographic methanol as solvent, and accurately configured by weight-volume method. Thiram, English name: Thiram,CAS number: 137-26-8 2. traceability and fixed value method This standard substance takes the configuration value as the standard value, and uses high performance liquid chromatography-diode array detector (HPLC-DAD) to compare this batch of standard substances and quality control control samples to verify the preparation value. By using preparation methods, measurement methods and measuring instruments that meet the requirements of metrological characteristics, the traceability of the value of the standard substance is guaranteed. 3. characteristic value and uncertainty (see certificate) number name standard value (ug/mL) relative expansion uncertainty (%)(k = 2)BW10134 The uncertainty of the standard value of the two 1003 in methanol is mainly composed of raw material purity, weighing, constant volume and uniformity, stability and other uncertainty components. 4. uniformity test and stability inspection According to the JJF1343-2012 [General Principles and Statistical Principles of Standard Substance Setting], random sampling of sub-packed samples is carried out, uniformity test of solution concentration is carried out, and stability inspection is carried out. The results show that the standard material has good uniformity and stability. The standard substance is valid for 24 months from the date of setting the value. The development unit will continue to monitor the stability of the standard substance. If the value changes are found during the validity period, the user will be notified in time. 5. packaging, transportation and storage, use and precautions 1. Packaging: This standard substance is packed in borosilicate glass ampoules, about 1.2 mL/branch. When removing or diluting, the pipette quantity shall prevail. 2. Transportation and storage: ice bags should be transported, and extrusion and collision should be avoided during transportation; storage under freezing and dark conditions. 3. Use: Balance at room temperature (20±3 ℃) before unsealing, and shake well. Once the ampoule is opened, it should be used immediately and cannot be used as a standard substance after being fused again.
Last Update：2022-10-16 17:13:39
aapirol - Reference Information
| (IARC) carcinogen classification | 3 (Vol. Sup 7, 53) 1991 |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Fungicide | Formerly is a trade name, and its chemical name is tetramethylthiuram disulfide, accelerator TMTD. Demi Shuang is the first organic synthetic fungicide species discovered by scientists. It is an organic sulfur fungicide that has been used in agricultural production for more than 80 years. Fomei Shuang is a protective fungicide, a broad-spectrum protective Fomei fungicide, and its scope of application is good for a variety of crop downy mildew, blight, anthracnose, cereal smut, and seedling yellow blight. control. Industrial synthesis mainly includes peroxide synthesis and air oxidation synthesis. In addition, the process of using sodium hypochlorite as oxidant and using electrophoresis to synthesize accelerator TMTD has also been reported. The above synthesis methods generally have the disadvantages of high cost of synthetic products. With reference to relevant literature, dimethylamine and carbon disulfide are proposed as raw materials. The process route of hydrogen peroxide as oxidant and water as solvent synthesis accelerator TMTD has obtained higher yield (98%) and better product quality (reaching the level of international first-class products), while effectively reducing environmental pollution. |
| application | currently, rubber accelerator TMTD is an excellent second accelerator for thiazole accelerators, and can also be used as an accelerator for continuous vulcanization of colloidal particles with other accelerators. it can also be used together with accelerator MBT(M), and its situation is basically similar to that of butyl rubber. The accelerator is mainly used in the manufacture of tires, inner tubes, rubber shoes, medical supplies, cables, industrial rubber products, etc. It is used as a fungicide and pesticide in agriculture, and can also be used as a lubricant additive. |
| toxicity | acute oral LD50 in rats is 780~865 mg/kg. The acute oral LD50 of mice is 1500~2000 mg/kg. It has a stimulating effect on the mucous membrane and skin, and people who have long-term contact with alcohol have an allergic reaction. Carp LC50 is 4mg/L. |
| use | the broad-spectrum protective fungicide of the two genera, with a residual effect of about 7d. It is mainly used to treat seeds and soil, prevent powdery mildew, smut, rice seedling blight of cereal crops, and can also be used for some fruit trees and vegetable diseases. If 500g of 50% wettable powder is used for seed dressing, rice blast, rice flax leaf spot, barley and wheat smut can be controlled. as a pesticide, this product is usually called famishuang, which is mainly used to treat seeds and soil and prevent cereal powdery mildew, smut and vegetable diseases. As a super accelerator of natural rubber, synthetic rubber and latex, this product is usually called accelerator TMTD. It is a representative of Tyuram vulcanization accelerator and accounts for 85% of the total amount of similar products. As a super accelerator of natural rubber, diene synthetic rubber, II, R and EPDM, it is the one with the highest utilization rate. The vulcanization promotion force is very strong, but when there is no zinc oxide, it is not vulcanized at all. suitable for natural rubber, synthetic rubber, latex, and can be used as vulcanizing agent. This product is an excellent second accelerator for thiazole accelerators, which can be used together with other accelerators as an accelerator for continuous vulcanization of rubber compounds. It is used as a super vulcanization accelerator in the rubber industry. It is often used with thiazole accelerators, and can also be used with other accelerators as a continuous rubber accelerator. Because it slowly decomposes free sulfur above 100 ℃, it can be used as a vulcanizing agent. The products have excellent aging resistance and heat resistance. Suitable for natural rubber and synthetic rubber. Mainly used in the manufacture of tires, inner tubes, rubber shoes, cables and other industrial products. It is used as a fungicide and insecticide in agriculture, and can also be used as a lubricant additive. |
| production method | ammonium dimethyl dithiocarbamate is obtained by condensation reaction of dimethylamine, carbon disulfide and ammonia water, which is then oxidized by hydrogen peroxide to the finished product. the preparation of the sodium dimethylamine hydrochloride and carbon disulfide in the presence of sodium hydroxide to produce sodium dimethylamino dithioformate (sodium), the reaction temperature of 50~55 ℃,pH value of 8~9. Preparation of Formede Sodium (or Formede ammonium) and hydrogen peroxide in the presence of sulfuric acid to generate Formede, the temperature is controlled below 10 ℃, and the end pH value is 3~4. Chlorine can also be used instead of hydrogen peroxide and sulfuric acid. The reaction is carried out in a sieve tray tower. Chlorine enters from the bottom of the tower after dilution, and the top of the tower is sprayed with 5% of the sodium frome solution, which is called chlorine-air oxidation method. Sodium nitrite oxidation or electrolytic oxidation can also be used. |
| category | toxic substances |
| toxicity classification | poisoning |
| acute toxicity | oral-rat LD50: 560 mg/kg; Oral-mouse LD50: 1250 mg/kg |
| stimulation data | eyes-rabbit 100 mg/24 hours moderate |
| flammability hazard characteristics | thermal decomposition of toxic nitrogen oxide, sulfur oxide gas |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; separate from food raw materials storage and transportation |
| fire extinguishing agent | sand, dry powder, foam |
| occupational standard | TWA 5 mg/m3; STEL 10 mg/m3 |
| auto-ignition temperature | 316 °F |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-threatening and health concentration | 100 mg/m3 |
Last Update：2024-04-10 22:29:15
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View History
Raw Materials for aapirol