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jingjingll

木虫 (正式写手)


[交流] 关于破乳的问题

冰冻破乳是什么机理呢?非离子做乳化剂的时候能冰冻破乳吗?谢谢了
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qiuxuesha

银虫 (小有名气)



小木虫(金币+0.5):给个红包,谢谢回帖
我也下载不了, 有个文章是BASF发的,读完你就清楚里面的原因了。

http://www.springerlink.com/content/w547772337678t71/

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

espite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing.
18楼2011-07-26 11:47:00
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gyliar

新虫 (初入文坛)



jingjingll(金币+1):谢谢参与
破乳主要是因为乳液系统稳定性差造成的,冰冻稳定性又叫做冻融稳定性,做这个测试只是为了证明你体系的稳定性。
5楼2011-07-21 14:19:32
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lyf88

木虫 (正式写手)



jingjingll(金币+1):谢谢参与
引用回帖:
Originally posted by gyliar at 2011-07-21 14:19:32:
破乳主要是因为乳液系统稳定性差造成的,冰冻稳定性又叫做冻融稳定性,做这个测试只是为了证明你体系的稳定性。

楼上回答基本正确~非离子型的一般冷冻破乳,当然,稳定性不很好的机械破乳也可以,如高速离心~
6楼2011-07-21 14:40:33
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jingjingll

木虫 (正式写手)


引用回帖:
Originally posted by lyf88 at 2011-07-21 14:40:33:
楼上回答基本正确~非离子型的一般冷冻破乳,当然,稳定性不很好的机械破乳也可以,如高速离心~

我想问一下楼主 非离子型的 是不是不能用加盐的方法破乳呢 破乳的机理是什么呢
7楼2011-07-21 16:24:33
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