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[Chemical Knowledge]：The difference and application of pure mdi and liquefied mdi

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For many people, pure MDI and liquefied MDI are two unfamiliar terms. But in fact, in the field of chemical industry, these two substances have their own unique application value. Before we formally discuss the difference between pure MDI and liquefied MDI, let's understand their respective definitions. Pure MDI refers to dimethyl diisocyanate, which is an organic compound containing two isocyanate groups in its molecule. It has the characteristics of low solubility, higher melting point and less volatility. The liquefied mdi refers to the liquefied product of dimethyl diisocyanate, which is usually obtained by mixing pure mdi with an appropriate amount of solvent. Below we will make a detailed comparison between pure MDI and liquefied MDI in terms of production process, properties and applications.

first from the production process, pure mdi is an organic compound obtained by the heating reaction of benzene diisocyanate with methanol or ethanol, while liquefied mdi is obtained by mixing pure mdi with an appropriate amount of solvent, and the production process is relatively simple. Secondly, in terms of properties, pure mdi has the characteristics of low solubility, high melting point and low volatility, while liquefied mdi has high solubility and volatility. Finally, in terms of application, pure MDI is mainly used in the manufacture of polyurethane and its products, such as polyurethane foam, polyurethane elastomer, polyurethane elastomer, etc., while liquefied MDI is mainly used as an additive for polyurethane elastomer, which can improve the strength and toughness of polyurethane elastomer. Through the above comparison, it can be seen that there are obvious differences between pure mdi and liquefied mdi in terms of production process, properties and applications.

in addition to the above differences, pure mdi and liquefied mdi also have different application scenarios in practical applications. Because of its low volatility and high purity, pure mdi is mainly used in polyurethane products that require high purity and high stability, such as polyurethane sealants, polyurethane elastomers and other fields; while liquefied mdi is used in the manufacture of polyurethane elastomers and other fields due to its high solubility. At the same time, in some special industrial fields, there are also some new application scenarios. For example, the application of liquefied MDI in coatings, paints and other fields is gradually increasing, which is enough to show that the application prospect of liquefied MDI in the market is considerable.

to sum up, although pure mdi and liquefied mdi are dimethyl diisocyanate compounds, they are significantly different in terms of production process, properties and applications. For chemical practitioners, in-depth understanding and mastery of the properties and applications of pure MDI and liquefied MDI is of great significance for improving production efficiency and product quality. It is believed that with the continuous progress of science and technology and the continuous development of the industry, the application of pure mdi and liquefied mdi in more fields will be further expanded and inject new vitality into the chemical industry.

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