Let's review the previous article, in which we gave a simple overview of the cycloaliphatic epoxy resin, but we did not provide a comparative introduction to its different types and applications. As China's largest cycloaliphatic epoxy resin manufacturer, Synasia will give you an introduction of different cycloaliphatic epoxy resins and their UV curing applications in this article. Welcome all of you to brainstorm and give us more advice.
Let's start with a table list to show you some of our typical cycloaliphatic epoxy resins.
As a high-purity, low-viscosity, low-halogen cycloaliphatic epoxy resin, S-06E is highly transparent and its total chlorine content (VOC) can be controlled within 50ppm. Besides, it has excellent UV resistance and anti-radiation properties. This product is UV curable or thermal curable with anhydride (methyl tetrahydrobenzene, methyl hexahydrogenbenzene). It can be cured with aliphatic amine in the presence of a catalyst. S-06E is often used in UV coatings, electronic adhesives, insulation materials, LED encapsulants, 3D printing and other industries. Especially when used in electronic industries, e.g., LED encapsulation, it plays an outstanding electrical insulation performance.
S-21 and S-06E share the same CAS number, but S-21 is cheaper and its purity is slightly lower. This product is often used in industries like UV inks, UV coatings, UV adhesives, composites, etc., where the halogen content is not highly demanded.
S-28 is a highly flexible cycloaliphatic epoxy resin, which is suitable for many applications that require higher viscosity or more flexible films. It can be UV cured or thermally cured with anhydride. Typical applications include metal decorative coatings, overprint varnish, flexible packaging and laminating adhesives.
Likewise, S-28E and S-28 share the same CAS number. Because we have strictly controlled the halogen content of S-28E, the total chlorine content can reach less than 50ppm. Main applications include LED encapsulant, UV curing ink/coating, high-voltage electrical component, capacitor oil, transformer oil and other fields.
UV (Ultraviolet) curing material is formed under ultraviolet light, where a chemically active liquid formulation can be rapidly changed into a solid coating film on substrate surface. This innovative UV-curing technology has the characteristics of "5E": Efficiency, because UV curing equipment is compactly structured and it can realize continuous production for increased efficiency; Economy, because UV curing process can save raw materials and it can effectively reduce costs; Energy, because short curing time and no heating can save energy; Ecology, due to low VOC content and no excessive harmful gas in production; Enabling, because it is suitable for processing on surface of many kinds of substrate such as wood, metal, plastic, etc.
UV Coating / Ink Application
Epoxy resins are most widely used in coatings of different characteristics and applications. Their common features include:
Excellent chemical resistance, especially for alkali and acid.
Strong adhesion to paint film, especially for metal.
Bisphenol A type epoxy resin coatings feature poor weatherability. Their paint film is easily powdered and lack of fullness, which makes them not suitable for use in outdoor coatings or highly decorative coatings. Thus ordinary epoxy resin coatings are mainly used for anti-corrosion paint, metal primer and insulating paint. However the coatings which are made of heterocyclic or cycloaliphatic epoxy resins can be used outdoors.
Ultraviolet (UV) curing coatings become increasingly emphasized due to their advantages of fast cure, good film gloss, no bubble, no need for high temperature, etc. The coating which uses cycloaliphatic epoxy resin as main ingredient provides strong weatherability, high hardness, good adhesion, as well as good resistance to abrasion, impact and chemical corrosion. It can be used for PCB inks, optical disc coatings, as well as metal or plastic cover protection, etc
Due to its characteristics of low viscosity, low swelling ratio, low shrinkage rate, fast cure and high photosensitivity, cycloaliphatic epoxy resin has an extremely board application prospect in UV curing field. Especially in 3D printing emerging market, where customers seek for high-performance formulation and the government has raised demand for environmental protection, it will undoubtedly drive a significant increase in demand for cycloaliphatic epoxy resins.
Cycloaliphatic epoxy resin is usually applied in SLA (Stereo Lithography Appearance) cationic photosensitive system. Typical applications include:
Electronic product mold development
Test model for engineering design
3D human body and organ replication for auxiliary diagnosis, assisted surgery, etc.
Nantong Synasia New Material Co., Ltd. is mainly engaged in R&D and production of specialty epoxy resins for high-end markets. After several years of market investigation, we have developed two categories of more than 20 specialty epoxy resins. They are cycloaliphatic epoxy resins and multifunctional epoxy resins. Scan the QR code to follow us on Wechat. We have more to show you, awaiting for your coming!