Resin products In order to improve the progress of the construction process, and subsequent product function does not change the gender, shipbuilding resin plant always hope that the resin can accelerate the curing as complete as possible. For a certain reactive unsaturated resin is concerned, the amount of curing agent, accelerant resin curing rate and the subsequent curing has a significant impact.
Through theory and practice, we summarize the curing rules of unsaturated polyester resin as follows:
1, Unsaturated resin use, there should be sufficient amount of curing agent added to ensure adequate exothermic peak temperature, so as to achieve a high level of curing. (The amount of curing agent is too small may result in permanently under-cured resin crafts)
2, the use of unsaturated polyester resin in the high ambient temperature conditions may be appropriate to reduce the amount of accelerator to obtain a long enough gel time and more complete curing effect.
3, Unsaturated resin products in the general accelerator and curing agent (peroxide) molar ratio must be less than 1 (in this case, only in the choice of cobalt salt as a promoter in the case of gas only), otherwise the accelerator and The rate of reversal of the primary radicals will be greater than that of the primary radicals, resulting in a decrease in conversion. Therefore, too much application of the accelerator does not achieve the effect of accelerating the curing, but rather degrades the function of the unsaturated resin.
4, low reaction activity does not meet the maximum polyester resin curing should choose a low activity of the curing system.
5, under the adverse conditions of low temperature or high humidity curing, shipbuilding resin plant that can accept composite curing system: room temperature 25 degrees Celsius
Methyl ethyl ketone peroxide 1%
N, N-dimethylaniline 0.5%
Benzoyl peroxide 2%
The principle of curing summarized: sufficient amount of curing agent and the appropriate amount of promoter to make the unsaturated polyester resin cured completely, to achieve the desired results.