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Silicone-based UV-curable resins classified by curing system
Release time:
2024-12-06 17:13
Silicone photopolymer resins are silicone materials that can rapidly cure upon exposure to ultraviolet or visible light. They exhibit excellent properties such as fast curing speed, low energy consumption, zero pollution, high hardness, wear resistance, and chemical corrosion resistance. These resins are widely used in fields including electronic packaging, optical components, coatings, and printing. This article will provide a detailed introduction to the classification of silicone photopolymer resins according to their curing systems and their respective characteristics.
I. Free Radical System
The free-radical curing system is the most commonly used curing system in silicone photopolymer resins. Free-radical–initiated silicone resins primarily employ photosensitive prepolymers containing unsaturated bonds. After absorbing light energy, the photoinitiator decomposes to generate free radicals, which then initiate polymerization reactions by attacking the unsaturated bonds in the resin, thereby achieving curing.
The photoinitiators used in free-radical curing systems mainly include the following categories:
(1) α-Hydroxyketones: such as 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-phenylpropanone, which exhibit high light absorption efficiency and free-radical yield.
(2) Benzoin ethers: Such as benzoin dimethyl ether, these photoinitiators have low volatility and are suitable for thicker coatings.
(3) Aryl ketones: such as benzophenone and benzyl dimethyl acetal. These compounds have a relatively broad light-absorption range and are suitable for light sources with different wavelengths.
These resins cure relatively quickly, but their curing process can be hindered by oxygen inhibition. To overcome this drawback, methods such as nitrogen purging or the addition of antioxidants are commonly employed to enhance the curing efficiency. Free-radical-based, light-curable organosilicone resins are widely used in fields such as coatings, inks, and adhesives.
II. Cationic System
Cationic-system photocurable silicone resins utilize a specific cationic initiator. After the photoinitiator absorbs light energy, it generates cations, which in turn trigger polymerization reactions involving functional groups within the resin, thereby achieving curing.
The photoinitiators used in cationic curing systems mainly include the following categories:
(1) Sulfonium salts: such as triphenylsulfonium salts and diphenyliodonium salts, which exhibit high light absorption efficiency and cation yield.
(2) Ferrocene salts: Such as ferrocene hexafluorophosphate, these photoinitiators exhibit high thermal stability and chemical stability.
(3) Aryldiazonium salts: such as diazomethane and diphenyldiazonium, which have a relatively broad light absorption range and are suitable for light sources of different wavelengths.
These resins feature characteristics such as low volumetric shrinkage, resistance to oxygen inhibition during polymerization, and relatively slow curing rates. Cationic-system UV-curable silicone resins are particularly suitable for applications requiring high precision and low volumetric shrinkage, such as the fabrication of optical components.
III. Anionic System
An anionic curing system works by means of a photoinitiator that absorbs light energy to generate anions. These anions then initiate polymerization reactions in the functional groups of the resin, thereby achieving curing.
The photoinitiators used in anionic curing systems are relatively few and mainly include the following categories:
(1) Alkali metal salts: such as alkali metal alkoxides and alkali metal carbonates—they exhibit high light absorption efficiency and anion yield.
(2) Organic amines: Such as triethylamine and dimethylaminopyridine, these photoinitiators exhibit high reactivity.
IV. Mixed System
Hybrid-system photocurable silicone resins contain photoreactive groups that simultaneously incorporate both free-radical and cationic curing systems within the polymer matrix. By combining a free-radical curing system with either a cationic or anionic curing system, these resins leverage the advantages of both curing mechanisms to achieve more efficient curing.
These resins allow the proportions of the two systems to be adjusted according to specific needs, combining the advantages of both systems to achieve optimal performance. Hybrid-system UV-curable silicone resins hold broad application prospects in fields such as coatings, inks, and adhesives.
V. Conclusion
Free-radical curing systems, cationic curing systems, and hybrid curing systems are the primary curing systems used for organosilicon UV-curable resins. Each of these systems has distinct reaction characteristics and produces cured products with different properties, making them suitable for various application fields and scenarios. By selecting an appropriate curing system and optimizing curing parameters, it is possible to achieve rapid curing and high degree of cure in organosilicon UV-curable resins, thereby enhancing the material’s performance and reliability. Moreover, additives and fillers can be incorporated according to specific requirements to further improve the properties of the cured products, providing higher-quality solutions for a wide range of applications.
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Light-curable silicone resins, as a class of high-performance, multifunctional polymer materials, have demonstrated broad application prospects in recent years across various fields, including coatings, adhesives, electronic packaging, and optical fiber coatings. These resins feature light-sensitive groups at their core and undergo rapid curing via photopolymerization, forming coatings or bonding structures with outstanding performance.
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