Methylnaphthalene condensate of naphthalenesulfonic acid
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Hello everyone, I’m facing a problem: when I carry out high-temperature sealing of aluminum profiles, an oxidized aluminum film is formed, and at high temperatures this turns into hydrated alumina powder that adheres to the surface of the workpiece. In Japan, there is a product that can effectively disperse this substance in an aqueous medium, preventing it from sticking to the surface; magnetic resonance analysis shows that it is a naphthalenesulfonic acid formaldehyde condensation product. However, since it’s in a condensed state, I’m not sure how its molecular weight distribution affects its dispersing ability. I’ve tried various naphthalene-based dispersing agents from both domestic and foreign manufacturers, but none of them perform as well as the Japanese product (although I don’t know which company makes it). Could anyone provide some information on this? Thank you! (I’ve also tried domestic products such as Shuanghuan and BASF8906.) 9401, Kao 100. 910. 2746. Chuangsheng, Shanghai Reagents, and more than a dozen other brands – how are the naphthalenesulfonic acid methylnaphthyl condensates? Which one is better? *aoqihai@126.com 13286008318 QQ357544737. Thank you!
Since a GPC test was not conducted, MRI and IR tests were performed instead. Upon comparison, it was found that sodium naphthalenesulfonate with a higher amount of monomers exhibits better dispersion ability, followed by those with a lower amount of monomers; while the case with no monomers shows the worst dispersion ability. Can it be said then that lower molecular weight and lower sulfonation degree lead to better dispersion ability? Thank you. Which one has a low degree of sulfonation, such as 2?
Under normal conditions, the sulfonation degree is 1; the polymerization degree is around 10. I can provide you with samples.
This post was last edited by luzn2008 on 2010-1-30 18:54. We can give it a try. luzn2008@yahoo.com.cn