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Dipentaerythritol hexaacrylate

Release time:

2024-09-14 16:37

Dipentaerythritol hexaacrylate
Dipentaerythritol hexaacrylate

Dipentaerythritol hexaacrylate (DPHA), as a multifunctional reactive diluent, features a unique polyfunctional structure that not only reduces the viscosity of the formulation system, making the application process smoother, but also actively participates in the curing reaction, ensuring that the cured product exhibits outstanding overall performance. At the same time, DPHA’s multifunctionality enables it to deeply engage in the curing reaction, forming a tight and stable crosslinked network with other components in the system, thereby endowing these materials with enhanced adhesion, superior abrasion resistance, and exceptional chemical corrosion resistance. This comprehensive performance enhancement makes DPHA an indispensable key material in numerous high-end light-curing applications.

I. Dipentaerythritol Hexaacrylate (DPHA)

Dipentaerythritol hexaacrylate, also known as polydipentaerythritol hexaacrylate, typically appears as a colorless or pale yellow transparent liquid. As an acrylate compound, DPHA exhibits relatively high polarity. Consequently, it may dissolve more readily in polar solvents such as alcohols, ketones, esters, and certain highly polar aprotic solvents; however, its solubility in water is not very strong.

The chemical structure of DPHA consists primarily of a pentaerythritol backbone and multiple acrylate groups. Specifically, it comprises two pentaerythritol molecular backbones, with several hydroxyl groups on these backbones replaced by acrylate groups, resulting in six acrylate side chains.

DPHA has a relatively high viscosity and exhibits excellent chemical stability as well as outstanding photocuring performance. Its key characteristics include a high reaction rate, superior abrasion resistance, and strong adhesion to both metal and plastic substrates. However, DPHA has a relatively high glass transition temperature, and excessive use may lead to undesirable effects. With its exceptionally high reactivity, DPHA serves as a highly functional monomer in UV-curable systems. It can rapidly participate in the curing reaction, forming a stable crosslinked network structure. Thanks to its polyfunctional molecular structure, DPHA enables the formation of a densely crosslinked network during curing, endowing coatings or materials with exceptional physical properties and chemical stability. The coatings or materials cured from DPHA demonstrate outstanding abrasion resistance, effectively resisting wear and scratches caused by external mechanical forces. At the same time, they also exhibit excellent chemical resistance, capable of withstanding the erosion and degradation induced by a wide range of chemicals.

II. DPHA-80 and DPHA-90

DPHA-80 and DPHA-90 are two specialty products that we have successfully developed through different chemical modification approaches, based on the fundamental material—dipentaerythritol hexaacrylate (DPHA).

1. DPHA-80

DPHA-80 appears as a transparent liquid. After chemical modification, the functionality of DPHA-80 is adjusted to 5.5. A reduction in functionality typically means a decrease in the number of reactive groups available between molecules. This adjustment can optimize certain material properties, such as reducing viscosity, enhancing processability, or improving compatibility with other materials. The lower viscosity makes DPHA-80 easier to flow and mix during processing, thereby improving its processability.

Adjusting the functionality can affect the crosslinking density of DPHA-80. A lower functionality may imply a lower crosslinking density, but it could also bring advantages in other aspects. For example, a lower crosslinking density might endow the material with better flexibility and crack resistance, which can be more advantageous in certain applications. However, this should be evaluated based on the specific requirements of the application.

2. DPHA-90

DPHA-90 appears as a transparent liquid. As a modified derivative of DPHA, despite undergoing a modification process, it still retains the six acrylate groups originally present in DPHA, meaning that DPHA-90 also maintains its hexafunctional chemical characteristics. This retention of hexafunctionality enables DPHA-90 to form a highly dense and intricate crosslinked network structure during the curing reaction, thereby endowing its cured product with exceptional hardness, outstanding abrasion resistance, and superior chemical resistance.

Compared to DPHA, certain specific physical parameters of DPHA-90—such as molecular weight, viscosity, density, and refractive index—may differ slightly. However, these minor differences do not significantly affect the overall performance of DPHA-90. Thanks to the complete preservation of key functional groups, DPHA-90 generally maintains a high degree of similarity in performance to DPHA, thereby ensuring its stability and reliability across a wide range of applications.

III. Diethylene Glycol Hexaacrylate (6EO-DPHA)

Bis(pentaerythritol) hexaacrylate ethoxylate is typically a clear or semi-transparent liquid with poor solubility in water but good solubility in a variety of organic solvents.

6EO-DPHA retains the core structure of DPHA, namely the acrylate groups attached to the dipentaerythritol backbone. Building on DPHA, ethoxylation reactions were used to introduce ethoxy (EO) chain segments into the acrylate groups. Since 6EO-DPHA retains the acrylate groups found in DPHA, it still exhibits high reactivity. It can participate in polymerization reactions via various methods, including UV curing and thermal curing, thereby forming a highly crosslinked network structure.

The introduction of ethoxy segments has a certain impact on the crosslinking density and rate of 6EO-DPHA, but overall, its crosslinking capability remains strong. This highly crosslinked network structure imparts excellent physical properties to the cured product, such as high hardness, wear resistance, and chemical resistance.

IV. Conclusion

In summary, dipentaerythritol hexaacrylate (DPHA) and its modified products—DPHA-80, DPHA-90, and ethoxylated dipentaerythritol hexaacrylate (6EO-DPHA)—are all high-performance, multifunctional reactive diluents. The modifications made to these products have enhanced their overall performance, preserving the core properties of DPHA while introducing new functional characteristics, thereby broadening their application scope. These materials have demonstrated outstanding advantages in UV-curing and other high-end applications, driving further advancements in UV-curing technology and making significant innovative contributions to the fields of modern industry and materials science.

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Principle and Method of Propoxy Modification of Active Diluents

Propoxy modification of reactive diluents is a chemical modification approach aimed at altering the physical and chemical properties of reactive diluents by introducing propoxy groups (or their related functional groups), thereby meeting specific application requirements. The introduction of propoxy groups can increase the number of active sites in the diluent, influence its ability to undergo cross-linking reactions, and consequently fine-tune the performance of the cured product—such as hardness, abrasion resistance, and chemical resistance. Moreover, reactive diluents modified with propoxy groups may exhibit broader adaptability, enabling them to meet the specialized material-performance demands of various industries.

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