HANGZHOU HENMA ELECTRIC POWER TECHNOLOGY CO., LTD

Hangzhou Henma Power Technology Co., Ltd.

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Selection of curing agent

Release time:

2020-12-14

Curing agents are a class of substances or mixtures that enhance or control curing reactions. Resin curing is the process of irreversible changes in thermosetting resins through chemical reactions such as condensation, ring closure, addition or catalysis. Curing is completed by adding curing (crosslinking) agent, curing agent is an essential additive, whether for adhesives, coatings, potting compound need to add curing agent, otherwise epoxy resin can not be cured, the variety of curing agent on the mechanical properties of the cured material, heat resistance, water resistance, corrosion resistance and so on have a great impact.

　　curing agentA class of substances or mixtures that enhance or control curing reactions. Resin curing is the process of irreversible changes in thermosetting resins through chemical reactions such as condensation, ring closure, addition or catalysis. Curing is completed by adding curing (crosslinking) agent, curing agent is an essential additive, whether for bonding agents, coatings, castables need to add curing agent, otherwise epoxy resin can not be cured, curing agent varieties of curing agent on the mechanical properties of the cured material, heat, water, corrosion, etc. have a great impact.

　（1）think overcuring agentVarieties and Properties

　　The variety of curing agent has a great influence on the mechanical properties, heat resistance, water resistance and corrosion resistance of the cured material. For example, aromatic polyamine, imidazole, acid anhydride curing epoxy resin heat resistance is higher than aliphatic polyamine, low molecular polyamide curing agent. Aromatic anhydride cured epoxy resin water resistance is better than aromatic diamine and aliphatic polyamine curing agent, triethylenetetramine curing agent alkali resistance is good, but acid resistance and resistance to formaldehyde solution is poor, alicyclic polyamine (such as isophorone diamine) cured epoxy resin drug resistance is excellent, anhydride curing agent cured epoxy resin alkali resistance is better than acid resistance, should be based on the different uses and performance requirements to choose the appropriate curing agent.

　　（2）several differentcuring agentCompound use

　　Several kinds of curing agent composite use, can receive complementary effect, for example, low molecular polyamide curing agent with a small amount of meso-Urse D curing agent, both room temperature curing, but also can make the curing material toughness increase at the same time to improve heat resistance appropriately, trimellitic anhydride (TMA) and methyl tetrahydrophthalic anhydride composite use, the eutectic mixture viscosity is low (25 ℃, 200 ~ 250 mPa-s), easy to mix with epoxy resins each other and improve the manufacturability.

　　（3）focuscuring agentenvironmental friendliness

　　The selected curing agent should be non-hazardous to human body and non-polluting to the environment. Diaminoethane should never be used as curing agent alone, and modified amine curing agent should be used as much as possible.