Curing of epoxy resin

Curing agent plays an important role in the application of epoxy resin According to a Japanese expert, "the development of new curing agent is more important than the development of new epoxy resin, because some of the resins published in the literature, although of more academic value, have no practical significance The development of a new curing agent can solve a problem in the application of epoxy resin Epoxy resin itself is a kind of low molecular weight compound containing two (or more) active epoxy groups in the molecule Its molecular weight is between 300 and 2000, and it is thermoplastic Under normal temperature and general heating conditions, it will not cure, so it does not have good mechanical strength, electrical insulation, chemical corrosion resistance and other properties, so it cannot be directly applied Therefore, it is necessary to add a curing agent to form a formula resin, and carry out curing reaction under certain conditions to generate a product with three-dimensional network structure, so as to show various excellent properties and become a real epoxy material with use value Therefore, curing agent is indispensable in the application of epoxy resin, and even plays a decisive role to some extent; we discuss curing agent, in fact, the application of epoxy resin Of course, only adding curing agent to epoxy resin can not fully meet the requirements of practical application Thinners, fillers, tougheners, colorants, flame retardants, as well as various additives with special requirements, such as anti settling agent, thixotropic agent, etc., must also be added Various kinds of curing agents, diluents, toughening agents, fillers and other additives of different brands, according to the actual use requirements, carry out purposeful selection and combination, there will be a variety of formulas The application of these matching technologies can solve many technical problems in many fields and form a variety of materials, such as laminating materials, coatings, adhesives, casting materials (potting materials), impregnating materials, plastic sealing materials, encapsulating materials, wear-resistant materials, sealing materials, etc To solve the problem of application technology, the main problem is to choose materials to cooperate The choice of materials, first is the choice of curing agent, followed by the choice of various additives For those who have been engaged in resin application for many years, they mainly rely on their accumulated experience, refer to the latest scientific and technological data at home and abroad for selection, and then need to be determined by the test But for the new beginners, it is often difficult and needs a practical process At present, many foreign scholars apply "molecular design of polymer" technology to the selection of formula materials, and use advanced tools - microcomputer to process, so that the coordination technology can be completed in a short time, greatly improving the work efficiency However, the domestic research work in this area is still relatively backward