Viscosity or softening point. Phenolic polyepoxy resins Phenolic polyepoxy resins include phenol-formaldehyde type and o-cresol-formaldehyde type polyepoxy resins. Compared with diphenol-based propane type epoxy resins, the linear molecule contains more than two epoxy resins. Therefore, the cured product has a high crosslinking density, and has excellent thermal stability, mechanical properties, electrical insulation, water resistance and corrosion resistance. They are made by polycondensation of novolac resin and epichlorohydrin. Other polyhydroxyphenolic glycidyl ether type epoxy resins have practical representatives: resorcinol type epoxy resin, Ceramic Shaft resorcinol-formaldehyde type epoxy resin, tetraphenol ethane type ring Oxygen resin and trishydroxyphenylmethane type epoxy resin. These multifunctional glycidyl ether resins have high heat distortion temperature and rigidity after curing. They can be blended with general E-type resin alone or as high-performance composite materials (ACM). ), printed circuit boards and other matrix materials. Aliphatic polyol glycidyl ether type epoxy resin aliphatic polyol glycidyl ether molecule contains two or more epoxy groups, most of these resins have low viscosity; most of them are long-chain linear molecules , So it is flexible.
Compared with glycidyl ester epoxy resin, glycidyl ester epoxy resin and diphenol-based propane epoxidized resin, it has low viscosity and good processability; high reactivity; Ceramic Shaft higher adhesion than general epoxy resin, curing Good physical and mechanical properties; good electrical insulation; good weather resistance, and good ultra-low temperature resistance. Under ultra-low temperature conditions, it still has higher bonding strength than other types of epoxy resins. It has good surface gloss, good light transmission and weather resistance.
Glycidylamine epoxy resin The advantages of this type of resin are multifunctionality, high epoxy equivalent, high crosslinking density, and significantly improved heat resistance. The superior adhesion and heat resistance of glycidylamine epoxy resin have been used at home and abroad to manufacture carbon fiber reinforced composite materials (CFRP) for aircraft secondary structural materials. Cycloaliphatic epoxy resins are epoxy resins made by epoxidation of double bonds of cycloaliphatic olefins. Their molecular structure is very similar to that of diphenol-based propane epoxy resins and other epoxy resins. The difference is that the epoxy groups of the former are all directly connected to the alicyclic ring, while the epoxy groups of the latter are all connected to the benzene nucleus or aliphatic hydrocarbon with glycidyl ether. The cured product of cycloaliphatic epoxy resin has the following Ceramic Shaft characteristics: ①higher compression and tensile strength; ②long-term exposure to maintain good mechanical properties under high temperature conditions; ③arc resistance, UV aging resistance and Weather resistance is better.
Is the ceramic sticky?
2021 12/07