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Heat resistance of curing agent
- Jul 27, 2018 -

The curing reaction is a chemical reaction, which is greatly affected by the curing temperature. The temperature increases, the reaction speed increases, and the gel time becomes shorter. The logarithm of the gel time generally decreases linearly with the curing temperature. However, if the curing temperature is too high, the performance of the cured product is often lowered, so there is an upper limit of the curing temperature; a temperature at which the curing speed and the properties of the cured product are compromised must be selected as a suitable 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 curing agent at room temperature is room temperature to 50 ° C; the curing temperature of the medium temperature curing agent is 50 to 100 ° C; the curing temperature of the high temperature curing agent is above 100 ° C. . There are few types of curing agents which are low-temperature curing type, such as polydecyl alcohol type and polyisocyanate type; T-31 modified amine and YH-82 modified amine which are developed and put into operation in China can be cured at below 0 °C. There are many types of room temperature curing types: aliphatic polyamines, alicyclic polyamines, low molecular polyamides, and modified aromatic amines. The intermediate temperature curing type includes a part of an alicyclic polyamine, a tertiary amine, a carbazole, and a boron trifluoride complex. Examples of the high-temperature curing agent include aromatic polyamines, acid anhydrides, resole phenol resins, amino resins, dicyandiamide, and hydrazides.