2、Chemical modification method
Chemical modification introduces new functional groups or changes the molecular structure through chemical reaction, so as to fundamentally improve the performance of epoxy resin.
Selection of curing agent: The selection of curing agent has a vital influence on the performance of epoxy resin. Different types of curing agents can have different chemical reactions with epoxy resin to form curing products with different properties. For example, aromatic amine curing agent has higher reactivity and curing temperature, suitable for the preparation of high-strength, high heat-resistant epoxy resin materials; and fatty amine curing agent has a lower curing temperature and better toughness, suitable for low-temperature performance requirements of the occasion.
Add reactive diluents: reactive diluents are a class of low-viscosity monomers or oligomers containing functional groups that can participate in the curing reaction. They can not reduce the performance of the epoxy resin curing material under the premise of significantly reducing the viscosity of the resin system, improve its processing performance. At the same time, reactive diluents can also participate in the curing reaction, increase the crosslinking density and improve the performance of the cured product.
Introduction of crosslinking structure: The strength and heat resistance of epoxy resin can be significantly improved by introducing crosslinking structure. For example, by using hyperbranched polymers or nanoparticles as cross-linking points, more cross-linking bonds can be formed in the three-dimensional network of the epoxy resin, thus improving its mechanical properties and heat resistance. In addition, the toughness of the epoxy resin can be improved by introducing flexible chain segments, such as polyether and polyester, into the epoxy resin.
3, composite material modification method
Composite material modification is to compound epoxy resin with other materials (e.g., fibers, nanoparticles, etc.) to form a new material with excellent properties.
Fiber Reinforcement: Fiber reinforcement is one of the most common methods in epoxy resin composites. By adding high-strength, high-modulus fibers (e.g., carbon fibers, glass fibers, etc.) to the epoxy resin matrix, the mechanical properties and fatigue resistance of the composite material can be significantly improved. The interfacial bonding strength between the fiber and the epoxy resin matrix has an important impact on the performance of the composite material, so it is necessary to improve the bonding strength between the fiber and the resin through surface treatment and other methods.
Nanoparticle modification: Nanoparticles show great potential in epoxy resin modification due to their unique surface effect and quantum size effect. The uniform dispersion of nanoparticles (such as nano-silica, nano-calcium carbonate, etc.) in the epoxy resin matrix can significantly improve the mechanical, thermal and electrical properties of composites. In addition, nanoparticles can also improve the processing performance and wear resistance of epoxy resin.
4、New modification technology
With the development of science and technology, some new modification techniques are also applied to the modification of epoxy resin.
Interpenetrating network polymer (IPN) technology: IPN technology is a kind of composite material formed by interpenetrating two or more polymer networks. Through IPN technology, epoxy resin and other polymer materials (such as polyurethane, polyacrylate, etc.) composite, the formation of IPN materials with excellent performance, IPN materials not only have the advantages of the component polymers, but also through the interaction between the components to produce a synergistic effect, to further improve the performance of the material.
Hyperbranched polymer modification: Hyperbranched polymer is a new type of polymer material with highly branched structure. Its unique molecular structure makes hyperbranched polymers show unique advantages in epoxy resin modification. By introducing hyperbranched polymers as crosslinking points or toughening agents, the mechanical properties and toughness of epoxy resin can be significantly improved.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.