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Monofunctional Acrylate-Based Active Diluent (I)

Monofunctional Acrylate-Based Active Diluent (I)

A monofunctional acrylate reactive diluent is a compound that contains only one acrylate group per molecule, a group capable of participating in the curing reaction. These monofunctional reactive diluents play an important role in UV-curable systems: they not only dilute the resin to reduce viscosity but also take part in the curing reaction itself, thereby influencing the properties of the cured product.

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Common classification methods for reactive diluents

Common classification methods for reactive diluents

An active diluent—also known as a monomer, functional monomer, or reactive solvent—is a special type of compound widely used in the chemical and coatings industries. Active diluents are primarily small organic molecules containing polymerizable functional groups, typically including epoxy groups, acrylate groups, and others. These functional groups can participate in curing reactions and become an integral part of the cured film’s network structure. They not only dissolve or disperse film-forming substances but also take part in the film-forming process itself, becoming non-volatile components that remain in the coating film. In addition to reducing the viscosity of the system and improving application performance, active diluents can also participate in the curing reaction, thereby maintaining or enhancing the performance of the cured product.

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Polar ether-type non-reactive diluent

Polar ether-type non-reactive diluent

Polar ethers are ether compounds whose molecular structures contain polar bonds—particularly ether linkages (C-O-C) formed between oxygen and carbon atoms—and thus exhibit certain polar characteristics. Polar ethers are organic compounds formed by an oxygen atom connecting two hydrocarbon groups (which can be aliphatic or aromatic). The ether bond in their molecules imparts a degree of polarity to the entire molecule. Due to the high electronegativity of the oxygen atom, polar ethers display an uneven distribution of charge within their molecules, giving them a certain degree of polarity. However, compared with other polar solvents, ethers have relatively lower polarity. While they can dissolve some polar molecules, their ability to dissolve strongly polar substances is comparatively limited. Ether compounds possess relatively stable chemical properties and do not readily react with bases, oxidizing agents, or reducing agents.

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Special Types of Inactive Diluents (II)

Special Types of Inactive Diluents (II)

Propylene glycol monomethyl ether acetate (PMA/PGMEA), also known as propylene glycol monomethyl ether acetate, is primarily classified as a non-reactive diluent belonging to the ether ester family. Although its name includes both “ether” and “ester,” in practical applications it is often regarded as a distinct category due to its unique combined chemical properties—possessing both ether bonds and ester structures. Dimethylformamide (DMF) is an organic solvent with exceptional properties; under standard temperature and pressure conditions, it appears as a colorless, transparent liquid with a slight ammonia-like odor. DMF exhibits outstanding solvency, being completely miscible with water and most organic solvents. It demonstrates excellent dissolving power toward a wide range of organic and inorganic compounds, including fats, water, alcohols, ethers, esters, ketones, unsaturated hydrocarbons, and aromatic hydrocarbons. However, DMF is immiscible with saturated hydrocarbons such as gasoline, hexane, and cyclohexane.

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Special Types of Inactive Diluents (I)

Special Types of Inactive Diluents (I)

Non-reactive diluents based on aliphatic hydrocarbons consist primarily of linear or cyclic hydrocarbons. Common aliphatic hydrocarbon solvents include No. 200 solvent gasoline, kerosene, and diesel oil. These solvents have relatively simple molecular structures, composed mainly of carbon and hydrogen atoms, and do not contain other elements or functional groups such as oxygen, nitrogen, or sulfur. Non-reactive aliphatic hydrocarbon diluents are widely used in fields such as coatings, paints, and adhesives. They are primarily employed to reduce the viscosity of materials and improve their flowability, thereby facilitating easier application and construction.

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On Non-reactive Diluents for Aromatic Halogenated Hydrocarbons

On Non-reactive Diluents for Aromatic Halogenated Hydrocarbons

Aromatic halogenated hydrocarbons as non-reactive diluents can be classified into several types depending on the specific halogen atom involved. These compounds are formed when hydrogen atoms on the benzene ring are substituted by halogen atoms. Aromatic halogenated hydrocarbons as non-reactive diluents can be further divided into various subtypes, such as chlorobenzene, bromobenzene, and fluorobenzene. Among these, chlorobenzene derivatives (including chlorobenzene, dichlorobenzene, and trichlorobenzene) are among the most commonly encountered. In the chemical industry, these compounds are frequently used as diluents. Due to their relatively stable chemical properties and their tendency not to readily participate in reactions, they are referred to as non-reactive diluents.

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Introduction to Non-reactive Diluents for Aromatic Halogenated Hydrocarbons

Introduction to Non-reactive Diluents for Aromatic Halogenated Hydrocarbons

Alicyclic halogenated hydrocarbons, as non-reactive diluents, are primarily based on the skeletal structure of alicyclic hydrocarbons, in which one or more hydrogen atoms are replaced by halogen atoms (fluorine, chlorine, bromine, or iodine), forming halogenated hydrocarbon compounds. This structural feature endows them with both the stability characteristic of alicyclic hydrocarbons and the unique properties of halogenated hydrocarbons. Depending on the number of halogen substitutions, these diluents can be classified into monohalogenated alicyclic hydrocarbons and polyhalogenated alicyclic hydrocarbons. Furthermore, based on the number of rings in the alicyclic hydrocarbon, they can also be categorized into monocyclic, polycyclic, and types with special structural features.

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Aliphatic halogenated hydrocarbons in inactive diluents

Aliphatic halogenated hydrocarbons in inactive diluents

Halogenated hydrocarbon non-reactive diluents are characterized by the substitution of hydrogen atoms in their molecules with halogen atoms (such as fluorine, chlorine, bromine, and iodine), which endows them with unique physicochemical properties. There are numerous types of halogenated hydrocarbon non-reactive diluents, and they can be classified into various categories depending on the type of halogen atom and the position of substitution. Among the commonly used chlorinated hydrocarbon non-reactive diluents are chloromethane, dichloromethane, trichloromethane, and carbon tetrachloride; brominated hydrocarbon non-reactive diluents include bromomethane and dibromomethane.

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