Anti poly styrene sulfonic acid additive for coatings

[Zlatomirus]

Dear Sir ,

We are searching for a additive for PVA (Poly Vinyl Alcohol) water born film which will make this film stabile in presence of poly styrene sulfonic acid.

Thank you in advance.

Zlatomir

 

[kenvlach]

To my knowledge, PVA is not resistant to any acid or other strongly polar compounds, only to organics. The H[sup]+[/sup] from an acid will dehydroxylate the PVA (tear off the alcohol’s OH group to form water). See the chemical resistance table at

http://www.ansell-edmont.com/us/pdf/Ansell_7thEditionChemicalResistanceGuide.pdf

In searching the Internet, I found that PVA and coplymers, e.g., poly (ethylene + vinyl alcohol) is sometimes layered between polyethylene. The PE+VA copolymer is a gaseous diffusion barrier, while the PE outer layers are moisture and chemically resistant.

It is possible that the makers of PVA sponges may have a modified PVA formula:

http://www.ceibatech.com/AIONMain.htm

 

[cjkfox]

PVA can be insolubilized. The water-resistance of PVA films can be improved, but I don't have any information about improving acid resistance.

An internet search of "crosslink PVA" should provide other leads. Manufacturers of PVA emulsions may have some suggestions.

DuPont manufactures one type of product to crosslink PVA.

http://www.dupont.com/tyzor/

Other suppliers: Kenrich or Johnson-Matthey catalysts businesses