In order to improve the construction progress and the stability of the subsequent product performance, 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 curing agent and accelerator added has a great influence on the curing speed of the resin and the subsequent curing degree.
Through theory and practice, we have summarized the following curing laws
1. There must be enough curing agent added to ensure sufficient exothermic peak temperature to achieve a higher degree of curing. (Too little curing agent may cause permanent undercuring)
2. Under the condition of high ambient temperature, the amount of accelerator can be reduced appropriately to obtain a sufficiently long gel time and a more complete curing degree.
3. The molar ratio of the general accelerator to the curing agent (peroxide) must be less than 1, (this case can only be calculated if the cobalt salt is selected as the accelerator), otherwise the reverse speed between the accelerator and the primary radical It will be faster than the rate at which the primary radical initiates the monomer, resulting in a decrease in conversion. Therefore, excessive use of accelerators can not achieve the effect of accelerated curing, but will reduce the performance of the product.
4. For the curing of unsaturated polyester resin with low reactivity, the curing system with low activity should be selected.