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[Chemical Knowledge]：Difference Analysis of Isocyanate HDI and LDI

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In the chemical industry, isocyanate is a common chemical substance, there are two types of HDI and LDI. Although they are all isocyanate compounds, there are obvious differences in characteristics and uses. This article will compare HDI and LDI from multiple perspectives to help readers understand them better.

from the chemical structure, HDI(hexamethylene diisocyanate) and LDI(laurine diisocyanate) have different molecular structures. HDI molecules contain six subunits of methane, while LDI contains 12 alkyl subunits. This difference makes the two different in physical properties, such as HDI generally has a higher vapor pressure and lower viscosity, while LDI has a lower vapor pressure and higher viscosity.

in the field of application, HDI and LDI also have their own advantages. HDI is widely used in coatings, adhesives, elastomers, etc., with excellent wear resistance and weather resistance, while LDI has unique advantages in some special fields, such as medical devices, food packaging, etc., such as its Better biocompatibility and high temperature resistance.

In addition, in terms of environmental protection, the difference between HDI and LDI is also more obvious. Due to the particularity of its molecular structure, HDI is easier to decompose and has better biodegradability, so it has been widely used in some fields with higher environmental protection requirements, while LDI is used in some products that require longer service life. More common.

Generally speaking, although HDI and LDI belong to isocyanate compounds, there are obvious differences in chemical structure, physical properties, application fields and environmental protection. In practical applications, choosing the right type has an important impact on the quality and performance of the product. It is hoped that the introduction of this article can help readers better understand HDI and LDI and provide reference for their selection in actual production.

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