MDI is a polyurethane material synthesized by isocyanate and polyol and its coordinated aid. With its excellent performance, a variety of varieties, and vast uses, it is unique in many synthetic materials and has become one of the fastest -growing materials today. As the main raw material of synthetic polyurethane materials, in the late 1930s, German chemists O. Bayer and his colleagues have developed the synthesis method and processing technology of diisyl acid ester.

-Propanol, also known as isopropanol (English: isopropanol), IUPAC name is propan-2-ol, which is equivalent to 1-methylethanol. It is a colorless, flammable liquid with a strong odor at normal temperature and pressure. It is irritating . The molecular formula is C3H8O. With methyl ethyl ether, 1-propanol (n-propanol) as isomers. Isopropanol is the simplest secondary alcohol and one of the isomers of propanol, with a CAS number of 67-63-0. [1]

Isocyanates are a class of organic compounds whose chemical formula is generally R-N=C=O, where R represents an organic group. Isocyanates are substances with volatile liquids or solids, common ones are phenyl isocyanate, methyl isocyanate and so on.

Neopentyl glycol (NPG), white crystalline solid, odorless, hygroscopic. Mainly used in the production of plasticizers, surfactants, insulating materials, printing inks, polymerization inhibitors, synthetic aviation lubricating oil additives, etc. for unsaturated resins, oil-free alkyd resins, polyurethane foams and elastomers; At the same time, neopentyl glycol is also an excellent solvent, which can be used for the selective separation of aromatic hydrocarbons and cycloalkyl hydrocarbons; its amino baking varnish has good gloss retention and no yellowing; it can also be used as a production stabilizer, insecticide The raw material of the agent.

Aniline, also known as aminozene, is an organic compound. The chemical formula is C6H7N. It is a colorless oil -shaped liquid. It is heated to 370 ° C to break down, slightly soluble in water, and is easily soluble in organic solvents such as ethanol and ether.
Aniline is one of the most important amine. It is mainly used for manufacturing dyes, drugs, resin, and can also be used as a rubber sulfide promoter. It can also be used as a black dye. Its derivative methyl orange can be used as an indicator for the fixed pH.

Tablele alkali generally refers to sodium hydroxide (Sodium Hydroxide). It is also known as harsh sodium, alkali, and porridge. It is a kind of inorganic compound. Chemical NaOH, sodium hydroxide is strong alkaline, extremely corrosive, can be used as acid neutralizer, which can be used as a neutral agent agent. In conjunction with the mask, precipitant, sedimentary masking agent, toner, saponin, peeling agent, detergent, etc., the use is very wide.

Acetic acid, also called acetic acid, is an organic compound with the chemical formula CH3COOH. It is an organic monobasic acid and is the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic liquid with a freezing point of 16.6°C (62°F). After solidification, it becomes a colorless crystal. Its aqueous solution is weakly acidic and highly corrosive, and is highly corrosive to metals. Vapor is irritating to eyes and nose.

n-Butyl acetat，Referred to as acetate for short, is an organic compound with a chemical formula for CH3COO (CH2) 3CH3. It is a liquid with a colorless fruity aroma. It is an excellent organic solvent. Vegetarian, polystyrene, methyl acrylic resin, chloride rubber, and various natural gums have good solubility. Flammable. Acute toxicity is small, but it has strong irritation to the eyes and nose.

Ethyl acetate is a colorless, transparent, flammable liquid with a fruity aroma.
Ethyl acetate has low toxicity, is volatile, has a relative density of 0.902, a melting point of -83°C, and a boiling point of 77°C. It is slightly soluble in water and soluble in most organic solvents such as alcohol, ketone, ether, and chloroform. Its vapor and air can form Explosive mixture, meeting fire, high heat can cause combustion and explosion.