Since the 1990s, there have been many new features in the development trend of epoxy resin curing agents in the world, mainly in the following aspects.
Curing agent type
① New varieties emerge in an endless stream, the amines are still in the first place, followed by the anhydrides.
② The "semi inorganic polymer" curing agent containing P, Si, B, F, Mg and other elements has attracted people 's attention due to its unique properties.
③ The modified mercaptan system and the modified phenol system curing agent also have different degrees of development.
④ A large number of new block copolymers with thiol groups at the end are put on the market.
① The functional curing agent has become a hot spot of research and development.
(1) Multifunctional (with curing, toughening, flame-retardant, promoting and other functions) curing agent has become the ideal product that people pursue. Because the development of epoxy resin with new structure and excellent performance has not made much progress, the functional auxiliaries to meet the requirements of resin modification have become the goal of people's pursuit.
(2) Curing agents with fast curing, low temperature curing and minimum water absorption have developed rapidly.
(3) Curing agents with special functions have also made great progress, such as elastic curing agents.
② The curing agent is low toxic and non-toxic.
One of the characteristics of the development of modern curing agent is that people not only pay attention to the toxicity and environmental pollution of curing agent in the process of production and use, but also pay attention to the environmental pollution of waste epoxy resin products. In developed countries, the primary polyene, polyene and aromatic amines have all been replaced by non-toxic or low toxic modified amines.
③ Curing agents suitable for special environment (wet, underwater, outdoor, etc.) are popular.
④ In order to meet the high performance requirements of epoxy resin, curing agents with excellent electrical, mechanical and mechanical properties will be greatly developed.
⑤ More and more attention has been paid to electron beam and light curing agent.
⑥ The curing agent for powder coating, water-soluble solid ratio agent for water-based epoxy resin coating and one-component adhesive are widely used.
① The modification technology is widely used, such as the modification of aliphatic amine, the modification of epoxy resin (especially the modification of m-phenylenediamine and m-phenylenedimethylamine), the modification and liquation of acid, the modification and liquation of Dicyandiamide (the annual demand for liquid dicyandiamide in China is about 1000 tons), the modification and liquation of imidazole, and the modification of low molecular weight polyamine.
② The technology of compounding efficiency and containerization is in the ascendant. Restricted by toxicity, environmental regulations, cost, efficiency and other factors, the development of new structure curing agent is more and more difficult.
③ The technology of liquefying solid curing agent has a bright future. For example, anhydrides and dicyandiamide which are solid at room temperature can not only improve their operation and use performance, but also save energy.
④ Curing agent production operation and packaging refinement