c*s
发帖数: 2145 | 1 我用的IPDI和PPG1K做水性PU，还加入了DMPA和BDO 扩链，怎么做出来的膜那么软阿？
完全没有强度
具体条件：NCO：OH（FROM PPG）= 5：1，NCO：OH（ALL）=1.3
20个包子伺候 |
b**********r
发帖数: 10 | 2 For 20个包子, let me help you on this:
The film is soft is due to the low Tg of PPG. Use some other diols:
polyester or polycarbonate...............
【在 c*s 的大作中提到】
: 我用的IPDI和PPG1K做水性PU，还加入了DMPA和BDO 扩链，怎么做出来的膜那么软阿？
: 完全没有强度
: 具体条件：NCO：OH（FROM PPG）= 5：1，NCO：OH（ALL）=1.3
: 20个包子伺候
|
c*s
发帖数: 2145 | 3 为什么没有强度？
【在 b**********r 的大作中提到】
: For 20个包子, let me help you on this:
: The film is soft is due to the low Tg of PPG. Use some other diols:
: polyester or polycarbonate...............
|
r***y
发帖数: 187 | 4 我觉得要点不在于 Tg。PTHF Tg 也很低，不信你可以试试其他的diols，实施方法有问
题，感觉你的分子量太小。具体不好评价，不知道你具体做的。
【在 b**********r 的大作中提到】
: For 20个包子, let me help you on this:
: The film is soft is due to the low Tg of PPG. Use some other diols:
: polyester or polycarbonate...............
|
b**********r
发帖数: 10 | 5 I guess that it is difficult to make 20个包子
Anyhow, If I am right, you want high tensile strength. The simplest way to
get what you want is to go to the companies which sell PUDs, and check out
their product series and look for high tensile strength samples. You will
find what you need. Companies like:
http://www.bayermaterialsciencenafta.com/index.html
http://worldaccount.basf.com/wa/Startpage~en_US
http://www.dsm.com/en_US/html/dnr/home.htm
For the high tensile strength, many of polyester, po
【在 c*s 的大作中提到】
: 为什么没有强度？
|
k***l
发帖数: 25 | 6 NCO:total OH =1.3? How can you build molecular weight? You are still
expecting some mechanical properties for oligomers?
【在 c*s 的大作中提到】
: 我用的IPDI和PPG1K做水性PU，还加入了DMPA和BDO 扩链，怎么做出来的膜那么软阿？
: 完全没有强度
: 具体条件：NCO：OH（FROM PPG）= 5：1，NCO：OH（ALL）=1.3
: 20个包子伺候
|
c*s
发帖数: 2145 | 7 继续增大硬软比例，今天把膜揭开了，手使劲拽也拽不动， 以前做的7MA的还能动点，
哈哈
【在 k***l 的大作中提到】
: NCO:total OH =1.3? How can you build molecular weight? You are still
: expecting some mechanical properties for oligomers?
|
w********h
发帖数: 12367 | 8 祝贺你终于硬了。
【在 c*s 的大作中提到】
: 继续增大硬软比例，今天把膜揭开了，手使劲拽也拽不动， 以前做的7MA的还能动点，
: 哈哈
|
a*i
发帖数: 1652 | 9 嗯，膜也开了。
【在 w********h 的大作中提到】
: 祝贺你终于硬了。
|
k****l
发帖数: 377 | 10 agreed. PU is easy to make but hard to get the properties looking for.
materials,
【在 b**********r 的大作中提到】
: I guess that it is difficult to make 20个包子
: Anyhow, If I am right, you want high tensile strength. The simplest way to
: get what you want is to go to the companies which sell PUDs, and check out
: their product series and look for high tensile strength samples. You will
: find what you need. Companies like:
: http://www.bayermaterialsciencenafta.com/index.html
: http://worldaccount.basf.com/wa/Startpage~en_US
: http://www.dsm.com/en_US/html/dnr/home.htm
: For the high tensile strength, many of polyester, po
|
