Antioxidants are substances that block the adverse effects of oxygen. It is a class of substances that can help capture and neutralize free radicals, thereby eliminating the damage caused by free radicals to the human body. Antioxidants refer to food additives that can prevent or delay the oxidation of food, improve the stability of food and prolong the storage period. The correct use of antioxidants can not only prolong the storage period and shelf life of food, bring good economic benefits to producers and consumers, but also bring better food safety to consumers.

Antioxidants can be used as hydrogen donors to scavenge free radicals generated during the chain initiation stage, thereby inhibiting or reducing the oxidation of oils. Therefore, in order to delay the oxidation of fats and extend their shelf life, the most common and effective way is to add antioxidants to the fats.

Acetic acid, commonly known as acetic acid (AcOH) because it is the main component of vinegar, is one of the most important fatty acids. In nature, it occurs in many plants as free or esters. Molecular formula CH3COOH.

TDI is the abbreviation of toluene diisocyanate. TDI is a polycyanate widely used in industrial production. It is a polyurethane material and an important basic material. Mainly used to make flexible polyurethane foam, polyurethane elastomer, coatings, adhesives, etc.

Toluene diisocyanate is combustible in case of open flame and high heat. It can react with oxidants. Reacts violently with amines, alcohols, alkalis and warm water, and can cause combustion or explosion.

TDI (toluene diisocyanate) is one of the commonly used polyisocyanate, and polyisocyanate is an important base material of polyurethane (PU). The TDI commonly used in the polyurethane industry is a mixture of 2,4-TDI and 2,6-TDI isomers, including three commonly used grades.

The element in helium gas, the English name is Helium, the element symbol is He, and the atomic number is 2. Colorless and odorless inert gas, chemically inactive, usually difficult to react with other substances.

Firefighters must wear gas masks and full-body fire fighting clothes, and put out the fire in the upwind direction. Spray water to keep the fire container cool until the end of the fire extinguishing.

Hydroxypropyl toluene cellulose is a commonly used building material additive, which is widely used in industry and has a wide variety of types.

Meta-xylene is an organic compound with a molecular formula of C8H10 and a molecular weight of 106. It is a colorless and transparent liquid with an odor similar to toluene. It is insoluble in water, but miscible in most organic solvents such as ethanol, ether and chloroform. Used as solvent, medicine, dye intermediate, perfume, etc.

Antioxidant is a kind of plastic additives that can effectively reduce the self-oxidation reaction rate of plastics and promote the degradation of plastics.

In 2011, global methanol demand reached 54 million tons. In the next few years, driven by the rapid development of emerging applications, global methanol demand will soar to 85 million tons in 2015.