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Bifunctional Acrylate Reactive Diluent (I)

Bifunctional Acrylate Reactive Diluent (I)

Bifunctional acrylate-based reactive diluents are a commonly used class of compounds in UV-curable systems. Their molecules contain two acrylate groups that can participate in the UV curing reaction. During the UV curing process, these diluents not only serve to dilute the formulation and adjust its viscosity but also undergo photoinitiated polymerization via their double bonds, forming a crosslinked structure that significantly enhances the physical and mechanical properties as well as the resistance of the cured film. Due to the presence of two reactive functional groups, their curing speed is faster than that of monofunctional diluents, thereby greatly improving production efficiency.

05

2024

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09

Vinyl-based reactive diluent

Vinyl-based reactive diluent

The core characteristic of vinyl-based reactive diluents is the presence of vinyl functional groups, which can participate in a variety of chemical reactions, such as free-radical polymerization, cationic polymerization, or anionic polymerization. This enables them to crosslink with other resins or monomers during the curing process, forming a robust cured film. Moreover, due to their electron-rich nature, these vinyl groups readily form stable carbocations, making them highly susceptible to cationic polymerization—a process characterized by fast polymerization rates and high conversion yields. In addition to their functions of diluting and adjusting viscosity, vinyl-based reactive diluents can also act as reactive monomers, incorporating themselves into the curing process and becoming an integral part of the cured film. For this reason, vinyl-based reactive diluents are also referred to as functional monomers or crosslinking monomers.

03

2024

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09

A Brief Discussion on Acrylate- and Methacrylate-Based Active Diluents

A Brief Discussion on Acrylate- and Methacrylate-Based Active Diluents

Acrylate-based reactive diluents are compounds containing acrylate functional groups that can participate in photocuring reactions, thereby becoming an integral part of the cured product. Methyl methacrylate-based reactive diluents are a subclass of acrylate-based reactive diluents; their molecular structure includes a methyl methacrylate functional group—a acrylate group with a methyl substituent. Like acrylate-based reactive diluents, they also possess the ability to participate in photocuring reactions and play an important role in photocurable materials. Methyl methacrylate-based reactive diluents and acrylate-based reactive diluents share a close relationship in terms of chemical structure and application fields, yet they also exhibit several distinct differences. In methyl methacrylate-based compounds, the functional group is the methyl methacrylate group (an acrylate group bearing a methyl substituent); whereas in acrylate-based compounds, the functional group is simply the acrylate group (without a methyl substituent). The primary difference between methyl methacrylate-based reactive diluents and acrylate-based reactive diluents lies in the presence of the methyl group. The introduction of the methyl group can influence the compound's physical properties, chemical behavior, and application performance.

03

2024

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09

Vinyl ether-based monofunctional reactive diluents

Vinyl ether-based monofunctional reactive diluents

The basic structure of monofunctional vinyl ether-based reactive diluents includes one or more vinyl (C=C double bond) ether groups, which are attached either at one end or in the middle of a hydrocarbon chain. This structural feature enables them to react with other components in the resin system via free-radical polymerization or cationic polymerization during the curing process, thereby forming a stable crosslinked network.

02

2024

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09

Epoxy Diluents in Monofunctional Active Diluents (Part 3)

Epoxy Diluents in Monofunctional Active Diluents (Part 3)

Active epoxy diluents play a crucial role in epoxy resin systems, and these roles are indispensable for enhancing the processing efficiency of resins, optimizing the performance of cured products, and meeting diverse application requirements. By effectively reducing the viscosity of the system, they facilitate the dissolution, dispersion, and dilution of coatings, thereby significantly improving the flowability and uniformity of the adhesive solution, making operations simpler and more efficient. In the previous article, we introduced several monofunctional epoxy active diluents. In this installment, we will focus on two representatives from the same category: C12-14 alcohol aliphatic glycidyl ethers and neodecanoic acid glycidyl esters.

02

2024

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09

Epoxy Diluents in Monofunctional Active Diluents (Part II)

Epoxy Diluents in Monofunctional Active Diluents (Part II)

A monofunctional epoxy reactive diluent is a special type of epoxy diluent that features a single epoxy group and can chemically react with the epoxy resin during the curing process, forming a network structure linked by covalent bonds. Such diluents not only reduce the viscosity of the epoxy resin and improve its application performance but also become an integral part of the epoxy resin system after curing, thereby enhancing the overall performance of the final product. The primary characteristic of monofunctional epoxy reactive diluents is that they contain only one reactive epoxy group in their molecular structure. This allows them to participate effectively in the curing reaction without interfering with the curing process of the epoxy resin itself.

30

2024

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08

Epoxy Diluents in Monofunctional Active Diluents (I)

Epoxy Diluents in Monofunctional Active Diluents (I)

A monofunctional reactive diluent is a class of low-molecular-weight compounds containing a single reactive functional group. These functional groups can participate in crosslinking or polymerization reactions of polymeric materials, thereby diluting the polymers and improving their processability. In epoxy resin systems, monofunctional reactive diluents specifically refer to compounds that contain a single epoxy group. These epoxy groups can directly take part in the curing reaction of epoxy resins, forming a crosslinked structure that becomes an integral part of the cured material’s network, thus enhancing the final product’s physical and mechanical properties as well as its resistance to chemicals. Monofunctional epoxy diluents are commonly used in fields such as coatings, adhesives, and composite materials, particularly in applications requiring low-temperature curing, rapid curing, or improved flexibility of the coating film. Common examples of monofunctional epoxy diluents include glycidyl ethers and glycidyl esters.

30

2024

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08

Monofunctional Acrylate-Based Active Diluent (II)

Monofunctional Acrylate-Based Active Diluent (II)

A monofunctional acrylate reactive diluent is a unique compound characterized by the presence of only one acrylate group in each molecular structure. This single acrylate group actively participates in the subsequent curing reaction process. In ultraviolet (UV) curing systems, these diluents play a dual and critical role: on the one hand, they serve as diluents, effectively reducing the overall viscosity of the system and facilitating processing operations; on the other hand, they directly take part in the curing reaction, thereby exerting a certain influence on the physical and chemical properties of the final cured product.

29

2024

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08

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