Polyurethane pot life question

- Z
- Zhangmz
  
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posted
18 years ago

Tue, Jan 10, 2006 2:47 AM

Hi, I have a strange problem with the PU potlife. I mixed some polyols, molecular seive, coulourants and catlyst together and then mixed with iso, the pot life is kind of what I wanted. However, after about a week, when I tested the polyols prepared a week ago with the same iso, I found that the time from 25 0C to 40 0C decreased about 6 minutes, and the time from 40 to zero flow decreased 3 minutes. This really bothers me a lot. Is there anyone can give me some idea about this problem? Thanks a lot.

- I
- infinitum
  
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posted
18 years ago

Wed, Jan 11, 2006 2:52 PM

Activation of catalyst by adsorption or complexation on the molecular sieve? a écrit dans le message de news: snipped-for-privacy@g47g2000cwa.googlegroups.com...

- S
- Simon Kay
  
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posted
18 years ago

Thu, Jan 12, 2006 5:12 AM

Depends on the catalyst package you're using.

If the pigment is not designed for PU systems (dispersed in polyol) then I've come across wierd effects on cataysis before as well. Check your pigment - maybe make up a blend without pigment in it.

What are you storing the blend in? I've also had problems in the past if you use tins (system picks up tin from the solder in the tin joints).

Rgds,

Simon