Is it possible to delay the curing of polyester resin by keeping it below 10-degree celsius after adding the hardener?
Hi, I am working on resins. We can slow down curing reaction by decreasing temperature. Normally polyester resin is cured at 25-30 C in 24 h. If u reduce the temperature it will cure slowly, but in the end, it might be possible all the cross-linking not happened due to limited motion of cross-linking point after considerable curing so at the end we need to provide some temperature to cure it completely.
Dear all, you can use less active curing system, for exemple a peroxide with higher decomposition temperature. My Regards
Hi . I hope the following link could help: https://support.promarinesupplies.com/hc/en-us/articles/360026647691-How-can-I-keep-Epoxy-Resin-from-becoming-warm-and-curing-too-quickly-
Dear Dr. Adeel, Thank you very much for your suggestion. We are using MEKP hardener for the polyester resin. Can you plz let me know what percentage of hardener can be used to slow the crosslinking and what temperature would be better to keep without crosslink for at least 2 hr. ?
Dear Dr. Deke, We can not stop the curing reaction completely. Whether you are using MEKP without any accelerator? If yes, then we can control the gel time of polyester more than an hour below 0 C temperature. If you are using some accelerator with MEKP then gel point will be around 30 min. You can also used Acetylacetone peroxides to prolong gel point without accelerator. Normally concentration of MEKP is about 1 to 2 %. High concentration of MEKP will speed up the curing. But keep in mind for full curing at the end you have heat up your system.
Dear Dr Adeel, thank you so much for such a clear suggestion. I am using MEKP without accelerator. However, I will follow your curing agent and let you know the results. Thank you so much !!!
Dear Dr Adeel, thank you so much for such a clear suggestion. I am using MEKP without accelerator. However, I will follow your curing agent and let you know the results. Thank you so much !!!
Dear Dr Adeel, thank you so much for such a clear suggestion. I am using MEKP without accelerator. However, I will follow your curing agent and let you know the results. Thank you so much !!!
Dear Dr Adeel, thank you so much for such a clear suggestion. I am using MEKP without accelerator. However, I will follow your curing agent and let you know the results. Thank you so much !!!
Dear Dr Adeel, thank you so much for such a clear suggestion. I am using MEKP without accelerator. However, I will follow your curing agent and let you know the results. Thank you so much !!!
respected sir thank you to all for such a meaningful discussion here. Muhammad Adeel sir, is there any effect of heating for cross linking of the resin to the final composites? and what is the temperature limit to heat the system?
Ravi normally if we cure resin at high temperature or very low temperature a perfect skeleton of composite will not form. I mean at higher temperature there will be fast settings of crosslinking point whereas it will be very slow at low temperature. The temperature limit of any system depends on cross linker and the resin you are going to use. Can you clear it what resin and crosslinker you are using?
thank you sir for your suggestions Muhammad Adeel sir. i am using bisphenol A epoxy resin with diamine hardener.
with bisphenol and diamine, the best curing temperature and time is 100 ° C for two hours and 150 ° C for two hours. If your curing agent is easily miscible to epoxy at room temperature then you can easily find a long time for curing, As per my experience. I suggest you don't use solvent it will produce some bubbles.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nanostructures
- Thin Films