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Classification of curing agents

Release time:

2021-05-06

Curing agent, also known as hardener, maturing agent or change agent, is a class of substances or mixtures to enhance or control the curing reaction, resin curing is through the condensation, ring closure, addition or catalytic chemical reaction, so that thermosetting resins undergo irreversible changes in the process of curing is accomplished through the addition of curing (cross-linking) agent, curing agent is an indispensable additives, whether for bonding agents, paints, potting compound need to be added. Curing agent, otherwise the epoxy resin can not be cured. Curing agent varieties on the mechanical properties of the cured material, heat resistance, water resistance, corrosion resistance, etc. have a great impact on the curing agent according to the use of curing agent can be divided into room temperature curing agent and heating curing agent.

　　curing agentAlso known as hardener, ripening agent or change agent, is a class of enhancement or control of the curing reaction of substances or mixtures, resin curing is after condensation, ring closure, addition or catalytic chemical reaction, so that thermosetting resins undergo irreversible changes in the process of curing is completed through the addition of curing (cross-linking) agent, the curing agent is an indispensable additives, whether for bonding agents, coatings, potting compounds need to be added to the curing agent, otherwise the epoxy resin can not be cured.curing agentThe variety of curing material mechanical properties, heat resistance, water resistance, corrosion resistance, etc. have a great impact on the curing agent according to the use can be divided into room temperature curing agent and heating curing agent.

　　Epoxy resins generally have excellent performance when cured at high temperatures, but coatings and adhesives used in civil engineering and construction need to be cured at room temperature due to heating difficulties. Therefore, most of them use aliphatic amines, alicyclic mapping, and polyamides, etc., and especially the coatings and adhesives used in winter have to be used in conjunction with polyisocyanates, or use of polyalcohols that have a bad odor.

　　As for the medium temperaturecuring agentAnd high-temperature curing agent, it is necessary to be attached to the heat resistance of the body and the cured material heat resistance, adhesion and drug resistance, etc. as the benchmark for the choice, the choice focuses on polyamines and anhydrides, due to the anhydride cured material has excellent electrical properties. So it is widely used in electronics and electrical appliances.

　　Aliphatic polyamine curing substance adhesion as well as alkali and water resistance are excellent, aromatic polyamines are also excellent in drug resistance, due to the nitrogen element of the amino acid and the metal to form hydrogen bonds. Thus, it has excellent rust prevention effect, the higher the amine mass concentration, the better the rust prevention effect, the acid anhydride curing agent and epoxy resin form ester bonding, organic and inorganic acids show high resistance, the electrical properties are generally also more than the polyamine.