What are Thiols?

In organic chemistry, a class of non-aromatic compounds containing a thiol functional group (-SH) is called a thiol. Structurally, it can be seen as the oxygen formed in ordinary alcohols is replaced by sulfur. Except for methyl mercaptan, which is a gas at room temperature, all other mercaptans are liquid or solid. Lower mercaptans generally have a bad smell and are toxic. Thiol-30L secondary rectification polythiol mercapto compound, lower odor than conventional PEMP thiol. It can be applied to the oxygen inhibition phenomenon that can obviously improve the low energy curing conditions in the light curing system. The inhibition of oxygen is mainly due to the formation of peroxy radicals by the free radicals and oxygen in the system. The relatively stable peroxy radicals cause the chain growth reaction to slow down. The active hydrogen in the thiol can react with the peroxy radicals. After being deprived of hydrogen, new free radicals are formed and continue to participate in the addition reaction.

In thiols, the sulfur atom is an unequal sp ³ hybrid, and the sp ³ occupied by two single electrons

except

The mercapto group is the main manifestation of the mercaptan chemical properties . The SH bond involves a 3s / 3p hybrid orbit with a larger sulfur and a 1s orbit with a smaller hydrogen, so the SH bond is weak and the thiol is acidic. There is also a lone pair of electrons on the sulfur, so the thiol group can also be oxidized. ^[1]

Thiols can be

Some mercaptans can be used as drugs, antidote and

1. Site emergency monitoring method: portable

   Mercaptan personnel disposal

   Quickly evacuate personnel from the leaked contaminated area to a safe area and isolate them to strictly restrict access. Cut off the fire. It is recommended that emergency handlers wear self-contained positive-pressure respirators and fire protective clothing. Cut off the source of the leak if possible. Prevent entry into restricted spaces such as sewers and flood drains. ^[6]

   Protective measures

   1. Respiratory protection: When the concentration in the air exceeds the standard, you should wear a self-absorption filtering gas mask (half face). If necessary, it is recommended to wear an air respirator.

   2. Eye protection: Wear chemical safety protective glasses.

   3. Body protection: Wear antistatic work clothes.

   4. Hand protection: Wear rubber gloves.

   5. Others: Smoking is strictly prohibited on the job site. After work, take a shower and change clothes. Pay attention to personal hygiene.

   first-aid

   1. Skin contact: Remove contaminated clothing and rinse skin thoroughly with soap and water.

   2. Eye contact: Raise eyelids and rinse with running water or saline. Seek medical attention.

   3. Inhalation: Quickly leave the scene to fresh air. Keep your airways open. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. Seek medical attention.

   4. Ingestion: Drink plenty of warm water, induce vomiting, and consult a doctor.

   5. Fire extinguishing method: Move the container from the fire field to the open space as much as possible, and keep the fire field container cool by spraying water until the fire is over. Containers in the fire area must be evacuated immediately if they have discolored or generate sound from a safety pressure relief device. Fire extinguishing agent: solvent-resistant foam, dry powder, carbon dioxide, sand. Water extinguishing is not effective. ^[1]

   Thiol pollutant treatment

   • Small leaks: Absorb with activated carbon or other inert materials. It can also be rinsed with a large amount of water and diluted into the waste water system.

   • Massive leakage: construct a dike or dig to contain; cover with foam to reduce steam disaster. Use explosion-proof pump to transfer to tanker or special collector, recycle or transport to waste disposal place for disposal. ^[6]

   Mercaptan waste disposal

   Use incineration. The gas from the incinerator must be washed with an alkaline solution. ^[6]