temperature affect the curing agent reaction?

industry, because of the difference in composition, the curing conditions are also different. Let's introduce the effect of temperature on the reaction of curing agent.

curing agent is different, and the heat resistance of the cured product is also very different. The curing reaction is attributed to the chemical reaction, which is greatly affected by the curing temperature, the temperature increases, the reaction speed accelerates, and the solidification time becomes shorter; the logarithmic value of the solidification time decreases with the increase of the curing temperature. However, the curing temperature is too high, which often reduces the function of the cured product, so there is an upper limit of the curing temperature. It is necessary to select the temperature that makes the curing speed and the function of the cured product compromise as the appropriate curing temperature.
According to the curing temperature, the curing agent can be divided into four categories:
The curing temperature of the low-temperature curing agent is below room temperature; the curing temperature of the room temperature curing agent is room temperature ~ 50 ℃;
medium temperature curing agent is 50~100 ℃; high temperature curing agent curing temperature above 100 ℃.
is a low-temperature curing type of curing agent varieties are few, there are polymercaptol type, polyisocyanate type, etc.; belong to the room temperature curing type of many types: aliphatic polyamines, alicyclic polyamines; low molecular polyamide and modified aromatic amines. There are some alicyclic polyamines, tertiary amines, and imidazoles that belong to the medium-temperature curing type. Among the high-temperature curing agents are aromatic polyamines, acid anhydrides, resol resins, amino resins, dicyandiamide, hydrazide, and the like.
curing agent is greatly related to the heat resistance of the cured product. In the same type of curing agent, although it has the same functional group, its properties and cured product characteristics are different due to different chemical structures. Therefore, understanding the properties and characteristics of the curing agent is very important for the selection of the curing agent. Each curing agent has a different curing temperature, and the cured product also has a completely different heat resistance, so in different time periods, different seasons, long or short curing time is normal.