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Effect of curing agent and accelerator addition on curing of resin

Feb 28, 2019

In order to improve the construction progress and the stability of the performance of the products afterwards, we always hope that we always hope that the resin can be cured as soon as possible. For a certain reactive resin, the amount of the curing agent and the accelerator added has a great influence on the curing speed of the resin and the degree of curing thereafter.

Through theory and practice, we summarize the following curing laws

1. A sufficient amount of curing agent should be added to ensure a sufficient exothermic peak temperature to achieve a higher degree of curing. (The amount of curing agent is too small may cause permanent under curing)

2. The amount of accelerator added can be appropriately reduced under high ambient temperature conditions to obtain a sufficiently long gel time and a more complete degree of curing.

3. The molar ratio of the general accelerator to the curing agent (peroxide) must be less than 1, (this can only be calculated if the cobalt salt is selected as the accelerator), otherwise the reaction speed of the promoter and the primary radical is reversed. It will be greater than the rate at which the primary radical initiates the monomer, with the result that the conversion is reduced. Therefore, excessive use of the accelerator does not achieve the effect of accelerating the curing, but the performance of the product is degraded.

4. For the curing of low reactivity unsaturated polyester resin, a low activity curing system should be used.