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What is influence of construction environment on resin curing

Jan 26, 2019

The construction environment has a great influence on the curing of the resin. The higher the ambient temperature during construction, the shorter the gelation and curing time. Sometimes the construction temperature is increased by 10 ° C, which can shorten the gel time by nearly 1/2. If the construction environment temperature is too low, it will cause permanent under-curing. Because the resin can gel at low temperature, the macromolecule formed after gelation cannot move. Since there is not enough exothermic peak temperature to trigger the release of free radicals by the curing agent, the chain cross-linking reaction is not easy to proceed, eventually leading to permanent Under curing.


Generally, the construction temperature is not lower than 15 °C, and the relative humidity is not more than 80%.


Generally, in order to sufficiently cure the resin, it is preferred to carry out a high-temperature post-curing treatment after curing.


Post-cure treatment method: can be treated at 40 ° C for 2 hours, 60 ° C for 2 hours, 80 ° C for 4 hours, (if conditions can be treated at 100-120 ° C for 2 hours, the effect is better) and then cured at room temperature for 24 hours Put it into use again. If the construction unit has no heat treatment conditions, it can be cured at room temperature for one month after construction (and the curing time should be extended when the ambient temperature is low), so that it can be fully cured and put into use. This is especially important for resin curing for corrosion resistant applications.



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Neweco is one of the leading unsaturated polyester resin manufacturers and  suppliers,widely used in automobiles, ships, rail transit, wind power  generation, pipe cans, heat and corrosion protection, building  materials, stone repair, sanitary ware, artificial stone and other  industries. Suitable for hand lay-up, spray, pultrusion, winding,  molding, vacuum introduction / RTM, casting and other molding processes. Neweco Resin is committed to excellence and focuses on the application  of composite materials to provide customers with comprehensive  solutions.

 

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