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[Chemical Knowledge]：Properties and Uses of HDI

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HDI is an important chemical raw material, widely used in polyurethane, coatings, adhesives and other fields. This article will detail the nature and uses of HDI.

1. the properties of HDI

HDI (hexamethylene diisocyanate) is a colorless to yellowish transparent liquid with a strong pungent odor. It is a kind of alicyclic diisocyanate, which contains two isocyanate groups in the molecule and has high reactivity. HDI is chemically stable and insoluble in water, but it is miscible with many organic solvents.

HDI has the following characteristics:

1. High reactivity: The isocyanate groups in HDI molecules have high reactivity and can react with active hydrogen-containing compounds to generate the corresponding carbamate compounds.

2. Excellent chemical resistance: HDI has good resistance to acids, alkalis, salts and other chemicals, and can be used in some harsh chemical environments.

3. Good thermal stability: HDI has good thermal stability and can be used at higher temperatures.

2. the use of HDI

HDI as an important chemical raw material, widely used in polyurethane, coatings, adhesives and other fields. The following are the main uses of HDI:

1.

in the field of polyurethane HDI is one of the important raw materials for polyurethane synthesis, which can be used to produce polyurethane elastomers, polyurethane foams, polyurethane coatings, etc. In terms of polyurethane elastomers, HDI can be used to prepare polyurethane rubber with high strength and high wear resistance, which is widely used in machinery, automobiles, aerospace and other fields. In terms of polyurethane foam, HDI can be used to produce rigid foam and flexible foam, with excellent heat preservation and sound insulation properties. In terms of polyurethane coatings, HDI can be used to prepare polyurethane coatings with excellent weather resistance and chemical resistance, which are widely used in construction, automobiles, ships and other fields.

2.
in the field of coatings
HDI as a coating raw material, can be used to prepare high-performance anti-corrosion coatings, waterproof coatings, floor coatings, etc. Its coating film has excellent weather resistance, chemical resistance, wear resistance and other properties, can be widely used in construction, machinery, automobiles and other fields.

3.
in the field of adhesives
HDI can be used as one of the raw materials of adhesives for the preparation of polyurethane adhesives with high strength and high water resistance. Its adhesive has excellent bonding performance and weather resistance, and can be widely used in construction, furniture, automobiles and other fields.

In short, HDI, as an important chemical raw material, has been widely used in polyurethane, coatings, adhesives and other fields, providing important support for the development of various industries.

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