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Cycloaliphatic epoxy resins generally refer to a type of epoxy resin with a cyclic carbon chain structure in its molecular structure. Industrially, it is usually made by oxidizing an aliphatic olefin compound containing two double bonds with a peroxide (such as peracetic acid) to form an epoxidized aliphatic olefin compound.
Cycloaliphatic epoxy resins form a cross-linking polymer network after reacting with a curing agent. Because the active groups of cycloaliphatic epoxy resins are directly connected to the aliphatic ring, its reaction activity is lower than that of ordinary Bisphenol A type epoxy resins, so an anhydride curing agent with heating is often used for the curing process. Cycloaliphatic epoxy resins also do not contain hydroxyl groups in their structure, so accelerators can be used during the reaction to increase the reaction speed.
The outstanding advantage of cycloaliphatic epoxy resins is its excellent thermal stability. Because the epoxy groups of cycloaliphatic epoxy resins are directly connected to the aliphatic ring, the cross-linking density increases after curing, and it has a compact and rigid structure, leading to a high heat resistance temperature of the cured product.
Because the structure of ordinary Bisphenol A type epoxy resin contains a benzene ring, poor weather resistance is a common defect of Bisphenol A type epoxy resin. However, cycloaliphatic epoxy resins replace the benzene ring with a stable aliphatic ring structure, giving it excellent weather resistance and anti-yellowing properties.
The synthesis of aliphatic epoxy resin does not use epichlorohydrin and does not contain by-products such as chloride ions and sodium ions, thus cycloaliphatic epoxy resins have better dielectric properties compared to Bisphenol A type epoxy resin.
Cycloaliphatic epoxy resins have a low viscosity, making it easy to pour and encapsulate, providing good processability. Aliphatic epoxy resins can be used as epoxy diluents. Due to their excellent thermal stability, they can avoid the issue of reduced heat resistance temperature of cured products, which occurs with traditional diluents at high temperatures.
Cycloaliphatic epoxy resins have good dielectric and weather resistance properties, and can be used as a potting material for outdoor high-voltage switching devices, characterized by wear resistance, good impact strength, and high heat deformation temperature.
Cycloaliphatic epoxy resins, with their low viscosity, high heat deformation temperature, and good weather resistance, are widely used in mold materials and high-temperature-resistant composite materials.
The heat resistance and weather resistance of aliphatic epoxy resin allow topcoats to maintain color consistency without yellowing. Cycloaliphatic epoxy resins feature high hardness, wear resistance, good impact resistance, chemical corrosion resistance, and good adhesion, making it suitable for use in circuit board coatings.
Cycloaliphatic epoxy resins have good adhesion properties, and as the curing temperature increases, the bonding strength also increases.
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