Epoxy resin performance and characteristics

Epoxy resin refers to an organic polymer compound containing two or more epoxy groups in a molecule, and their relative molecular masses are not high. The molecular structure of the epoxy resin is characterized by the presence of an active epoxy group in the molecular chain, and the epoxy group may be located at the end, in the middle or in a ring structure of the molecular chain. Since the molecular structure contains an active epoxy group, they can be cross-linked with various types of curing agents to form an insoluble, infusible polymer having a three-dimensional network structure.
1. Various forms. Various resins, curing agents, and modifier systems can be adapted to the requirements of various applications, ranging from very low viscosity to high melting point solids.
2, easy to cure. Epoxy resin system can be cured in the temperature range of 0-180 °C by using various curing agents.
3. Strong adhesion. The presence of polar hydroxyl and ether linkages inherent in the epoxy resin molecular chain provides high adhesion to a wide variety of materials. The epoxy resin has low shrinkage when cured, and generates small internal stress, which also contributes to an improvement in adhesion strength.
4. Low shrinkage. The reaction of the epoxy resin and the curing agent used is carried out by a direct addition reaction or a ring-opening polymerization reaction of an epoxy group in a resin molecule, without the release of water or other volatile by-products. They exhibit very low shrinkage during curing compared to unsaturated polyester resins and phenolic resins.
5. Mechanical properties. The cured epoxy resin system has excellent mechanical properties.
6, electrical performance. The cured epoxy resin system is an excellent insulating material with high dielectric properties, surface leakage resistance and arc resistance.
7. Chemical stability. Generally, the cured epoxy resin system has excellent alkali resistance, acid resistance, and solvent resistance. Like other properties of cured epoxy systems, chemical stability also depends on the resin and curing agent chosen. Epoxy resin and curing agent can be used appropriately to make it have special chemical stability.
8, dimensional stability. The combination of many of the above properties gives the epoxy resin system outstanding dimensional stability and durability.
The inherent disadvantage of epoxy resin is that it is poor in impact damage resistance, poor toughness is relatively brittle, and heat resistance is also low.
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