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[Chemical Knowledge]：The nature and use of TDI

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The properties and uses of TDI are of great significance in the field of raw materials for chemical production. This article will detail the basic nature of TDI, production methods, main uses and safety and health requirements, so that readers can fully understand the relevant knowledge and application of TDI.

1. the basic properties of TDI

Toluene diisocyanate (TDI) is an important organic chemical raw material. It is a colorless or slightly yellow transparent liquid at room temperature and has a strong pungent odor. TDI is chemically active and can react with a variety of compounds to generate the corresponding polyurethane, polyurea, polyamide and other polymer compounds. TDI has a high boiling point, is not volatile, and has good stability.

2. TDI production method

TDI production method mainly has two kinds of phosgenation method and nitrification method. The phosgenation method is the reaction of toluene and phosgene to form TDI under the action of catalyst, the production process is mature and the product quality is stable, but a large number of by-products and waste are produced in the production process, which causes some pollution to the environment. The nitration method is the reaction of toluene and nitric acid under the catalysis of sulfuric acid to produce dinitrotoluene, which is then reduced to TDI. The production process of this method is simple, but the product yield is low and the production cost is high. The main purpose of

3. TDI

TDI is widely used in polyurethane foam, coatings, elastomers, adhesives and other fields. In the field of polyurethane foam, polyurethane foam produced by the reaction of TDI and polyol has excellent heat insulation, heat preservation, shock absorption and other properties, and is widely used in construction, home appliances, automobiles and other industries. In the field of coatings, TDI can be used as a curing agent to improve the weather resistance and chemical resistance of coatings. In the field of elastomers, polyurethane elastomers formed by the reaction of TDI with polyether or polyester and other polymer compounds have excellent wear resistance, impact resistance, oil resistance and other properties, and can be used to make tires, seals and the like. In the field of adhesives, TDI can be used as a curing agent for adhesives to improve the bonding strength and weather resistance of adhesives. Safety and health requirements of

4. TDI

TDI is irritating to human skin and eyes, and long-term exposure may cause occupational diseases. Therefore, safety and health requirements need to be strictly observed during production and use. Production enterprises should establish a sound occupational health management system and operating procedures, provide employees with labor protection products that meet national occupational health standards, and conduct regular occupational health inspections. Enterprises using TDI should strengthen ventilation, reduce the concentration of TDI in the workplace, and avoid long-term exposure to TDI causing harm to the human body.

In short, TDI as an important chemical raw material has been widely used in the fields of polyurethane foam, coatings, elastomers and adhesives. Understanding the nature and use of TDI is of great significance to the rational use of resources, the improvement of product quality and the protection of the environment. In the use process should strictly abide by the safety and health requirements to ensure the health of workers and enterprise production safety.

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