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Bisphenol A diacrylate

Release time:

2024-09-10 17:30

Bisphenol A diacrylate
Bisphenol A diacrylate

Bisphenol A diacrylate is an important chemical substance prepared by polycondensation of bisphenol A and diacrylate. It contains two acrylate functional groups, making it a bifunctional reactive diluent. By introducing ethoxy groups, bisphenol A diacrylate (BPADA) can be modified into various derivatives. Among these, ethoxylated bisphenol A diacrylate (4EO-BPADA) and ethoxylated bisphenol A diacrylate (10EO-BPADA) are relatively commonly used and can both serve as reactive diluents.

I. Bisphenol A diacrylate (BPADA)

Bisphenol A diacrylate (commonly referred to as BPADA) typically appears as a transparent or semi-transparent liquid or solid. BPADA generally exhibits good solubility in organic solvents such as acetone, methanol, and ethanol, but its solubility in water is relatively poor. Due to the existence of various derivatives and modified products of BPADA, its viscosity varies depending on factors such as molecular weight and degree of ethoxylation. In general, unmodified BPADA has a higher viscosity, whereas modified products that have undergone ethoxylation (such as 4EO-BPADA and 10EO-BPADA) may exhibit lower viscosities.

Bisphenol A diacrylate is synthesized through a chemical reaction between bisphenol A and acrylate groups, resulting in the formation of two polymerizable acrylate double bonds. Although the chemical structure of bisphenol A diacrylate is complex, its basic composition can be described as follows: two phenolic hydroxyl groups in the bisphenol A molecule are replaced by acrylate groups, thereby creating two active double bonds that can participate in photocuring reactions. The acrylate group contains an unsaturated carbon-carbon double bond, giving it high reactivity. This structural feature enables BPADA to undergo rapid free-radical polymerization upon exposure to a photoinitiator, ultimately forming a polymeric network structure.

Bisphenol A diacrylate can participate in a variety of chemical reactions, including free-radical polymerization and addition reactions, enabling it to form copolymers or crosslinked networks when combined with other monomers or polymers. The bisphenol A moiety provides two phenolic hydroxyl groups, which are crucial sources of its reactivity and chemical stability. The two acrylate groups contain unsaturated carbon-carbon double bonds, allowing BPADA to undergo free-radical polymerization. With its two acrylate groups, BPADA exhibits bifunctionality, enabling it to form crosslinked networks during photocuring. This not only increases the crosslink density and hardness of the cured film but also enhances its resistance to chemicals, thermal stability, and abrasion resistance. Both the phenolic hydroxyl groups and the acrylate groups are polar functional groups that can form hydrogen bonds or other intermolecular interactions with other polar molecules or groups, thereby influencing BPADA’s solubility in solvents and its distribution within the cured film. As a result, the viscosity of the entire system is reduced, making coatings and inks easier to flow and apply.

Bisphenol A diacrylate is used in UV-curable coatings as both an active diluent and a crosslinking agent. As an active diluent, it not only reduces the viscosity of the system and improves application performance but also participates in the polymerization reaction during UV curing, becoming an integral part of the cured film. This significantly accelerates the curing speed of the coating while maintaining or enhancing the performance of the cured film. Its high refractive index and excellent adhesion properties endow the coated film with outstanding gloss and durability.

II. Bisphenol A diacrylate ethoxylated with 4 moles of ethylene oxide (4EO-BPADA)

Ethoxylated bisphenol A diacrylate (4EO-BPADA) is typically a clear liquid, appearing colorless or pale yellow. 4EO-BPADA is obtained by introducing a certain number of ethoxy chains into bisphenol A diacrylate via an ethoxylation reaction. The "4EO" indicates that four ethoxy units have been incorporated into each molecule. This modification enhances the molecule's flexibility and hydrophilicity while also influencing its reactivity and physical properties. Structurally, 4EO-BPADA can be viewed as bisphenol A diacrylate to which ethoxy chains have been attached to the bisphenol A backbone through an ethoxylation reaction.

Due to the introduction of ethoxy segments, the physical properties of 4EO-BPADA—such as viscosity, solubility, and glass transition temperature—differ from those of unmodified bisphenol A diacrylate. Specifically, its viscosity decreases, its solubility improves, and its glass transition temperature is reduced. Compared to bisphenol A diacrylate, 4EO-BPADA exhibits superior physical and chemical properties. It typically features low viscosity, low volatility, and rapid curing, characteristics that give it advantages in specific applications.

III. Bisphenol A diacrylate ethoxylated with 10 moles of ethylene oxide (10EO-BPADA)

Ethoxylated bisphenol A diacrylate (10EO-BPADA) is typically a transparent liquid with high clarity and gloss. 10EO-BPADA is a compound obtained by introducing multiple ethoxy groups into bisphenol A diacrylate and then linking two acrylate groups to it.

Due to the increased number of ethoxy groups, 10EO-BPADA further enhances the molecule's flexibility and hydrophilicity. Moreover, it exhibits lower viscosity and better solubility. As the number of ethoxy groups increases, 10EO-BPADA has a lower glass transition temperature, higher flexibility, and superior impact resistance compared to 4EO-BPADA. This is because the increase in ethoxy groups reduces the intermolecular interaction forces, enabling the material to display excellent flexibility even at lower temperatures. Given that 10EO-BPADA has a higher degree of ethoxylation, it demonstrates even greater flexibility and improved impact resistance, making it particularly advantageous for applications that demand higher flexibility.

IV. Summary

Ethoxylation modification not only alters the molecular structure and molecular weight of the compound but also significantly affects its physical and chemical properties. Although these three compounds are structurally similar, differences in their degree of ethoxylation result in variations in their physical properties, chemical properties, and application areas. As the degree of ethoxylation increases, the material's flexibility and impact resistance gradually improve.

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