y****u
发帖数: 50 | 1 Tg=90, what temperature is good for compression molding? When I used 160 C it
colored. I plan to use 120 or 130, ok? For how long?
thanks a lot! | c*s
发帖数: 2145 | 2 seconds to minutes ba
it
【在 y****u 的大作中提到】
: Tg=90, what temperature is good for compression molding? When I used 160 C it
: colored. I plan to use 120 or 130, ok? For how long?
: thanks a lot!
| w********h
发帖数: 12367 | 3 100+Tg? that high?
for PS, 200C will destroy your samples
you can wait a long time at a lower T.
it | t***m
发帖数: 114 | 4
这样还有加工性么，不经济？
【在 w********h 的大作中提到】
: 100+Tg? that high?
: for PS, 200C will destroy your samples
: you can wait a long time at a lower T.
:
: it
| w********h
发帖数: 12367 | 5 if 100+Tg may ruin tha sample, what's the meaning of molding?
there is a efficient temperature to do that...
【在 t***m 的大作中提到】
:
: 这样还有加工性么，不经济？
| c*******n
发帖数: 1648 | 6 found this board this week, BM is a friend, feel excited.
bring some water here.
Those guys are right, Tg+100 should be a good processing temperature for
amorphous polymer. However, it could be lower, but 120C or 130C may not be enough
I don't know what you will do with your compression molded samples.
Generally color is usually seen for NYLON and some rubber compounds. Polyolefins
should be ok. color is not big problem for mechanical test or even rheological
test. First let your pellets sit on
【在 y****u 的大作中提到】
: Tg=90, what temperature is good for compression molding? When I used 160 C it
: colored. I plan to use 120 or 130, ok? For how long?
: thanks a lot!
| w********h
发帖数: 12367 | 7 welcome ah..
enough
Polyolefins
rheological
5-10
continually
it
【在 c*******n 的大作中提到】
: found this board this week, BM is a friend, feel excited.
: bring some water here.
: Those guys are right, Tg+100 should be a good processing temperature for
: amorphous polymer. However, it could be lower, but 120C or 130C may not be enough
: I don't know what you will do with your compression molded samples.
: Generally color is usually seen for NYLON and some rubber compounds. Polyolefins
: should be ok. color is not big problem for mechanical test or even rheological
: test. First let your pellets sit on
| y****u
发帖数: 50 | 8 Thanks for all the advices.
I used 140 C. I warmed the sample for 6 minutes (keeping small clearance),
then pumped 3-5 times (less than 1 min), compressed for 6 min. As a result,
the coloring was negligible. but still there were a few tiny bubbles inside (I
guess there were more invisible). Maybe I should pump it longer.
enough
Polyolefins
rheological
5-10
continually
it
【在 c*******n 的大作中提到】
: found this board this week, BM is a friend, feel excited.
: bring some water here.
: Those guys are right, Tg+100 should be a good processing temperature for
: amorphous polymer. However, it could be lower, but 120C or 130C may not be enough
: I don't know what you will do with your compression molded samples.
: Generally color is usually seen for NYLON and some rubber compounds. Polyolefins
: should be ok. color is not big problem for mechanical test or even rheological
: test. First let your pellets sit on
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