Curing phenolic resin in conventional oven
Curing phenolic resin in conventional oven
(OP)
Hi. I'm making some phenolic resol resin but the problem is, it generates a lot of voids. The water has been eliminated under reduced pressure but still when I cure it using oven, I got highly porous materials. Is there anyone can share tips, cure cycle or processing conditions that I can try on? I even tried the slow cure which took 4 days in the oven but failed! The samples came out very fragile and cracked! I did in autoclave too at 7 bar pressure but still got bubbles in it. Please anyone can help me, I'm dying to get good samples. Thank you.





RE: Curing phenolic resin in conventional oven
RE: Curing phenolic resin in conventional oven
RE: Curing phenolic resin in conventional oven
Are you using a forced convection oven, which has a fan to circulate air inside? Many lab ovens are gravity convection with no fan. These are okay for keeping small samples at a constant temperature, but perform poorly in quickly heating samples to the target temperature.
RE: Curing phenolic resin in conventional oven
B.E.
You are judged not by what you know, but by what you can do.
RE: Curing phenolic resin in conventional oven
Hi Berkshire, I couldn't find the book. Do you have the copy of it? Thanks in advance.
RE: Curing phenolic resin in conventional oven
I do have a copy That I bought from John a few months before he died.
B.E.
You are judged not by what you know, but by what you can do.
RE: Curing phenolic resin in conventional oven
RE: Curing phenolic resin in conventional oven
Compositepro: Just to make sure, I used liquified phenol, formaldehyde, sodium hydroxide, and hydrochloric acid (for neutralisation). There is no solvent, right? Thanks!
Thank you so much everyone. Need to work out what's best as been spending 10 months tryin' to produce good resin!
RE: Curing phenolic resin in conventional oven
How many books have you read about phenolic resins in those 10 months? Phenolics are one of the first plastics used commercially. There has been a lot published about them but most of the literature is well over 50 years old. The old books tend to be very descriptive compared to those of today. You may need to go to a research library to find them.
Phenolic parts are most often made by compression molding using over 1000 psi. Good parts are pretty easy to make this way. Non-pressurized cure is much more challenging.
RE: Curing phenolic resin in conventional oven
Since you seem to be in the UK and I am in the USA that would be a little difficult.
Since this resin originated in Europe , you might see what you can find on Bakelite
Check out Blagden Cellobond ( formerly B-P performance Plastics) Sully South Glamorgan CF645YU They used to sell Phenolic resins.
They may also offer support.
B.E.
You are judged not by what you know, but by what you can do.