Water-repellent films cleaning

It had been demonstrated [39] early on that in hydrogen sulfide corrosion the inhibitor has to be in contact with a sulfided (precorroded) surface in order to show inhibition. This observation rendered useless all those test procedures in which the inhibitor is applied to a clean metal surface in so-called film persistency tests. While it is well established that certain chemicals, such as high molecular weight fatty acids, have an affinity for metal surfaces and can form a water repellent film, they are readily replaced by other compounds that have a stronger affinity, for instance H2S. Fatty amines, on the other hand, adsorb strongly on iron sulfide, and their desorption from sulfided surfaces takes much longer them the desorption of fatty acids from bare metal surfaces in the presence of H2S. 

Besides such electrical applications as water-repellent surface films, there are many applications where water repellency is an end in itself. Treated glass windowpanes or windshields are not wet by muddy water, and so they stay clean longer and are easier to clean whenever washing is required. Rain docs not flood the surface of a treated windshield but stands in small droplets when the car is in motion the air stream blows the droplets off, leaving the glass clear. Treated tumblers are easier to wash and dry treated chemical glassware holds water with a flat meniscus treated vitreous enamel does not stain easily and has improved luster. Cloth and paper may be made water-repellent for protection against rain, and it is possible that all clothes could be so treated. 

Application Dedusting agent for dry cleaning detergent, alkaline powders, water-repellent fabric finishes. Used in emulsion polymerization for formation of polyvinyl acetate and acrylic films. 

Uses Dry cleaning detergent internal lubricant, slip agent for plastics, coatings, films foam/visc. stabilizer water repellent for textiles emulsifier, emulsion stabilizer, surfactant, vise, control agent in cosmetics in closure-sealing gaskets for food containers defoamer in food-contact paper/paperboard... 

The corresponding polymers are obtained in the usual way by vapor phase deposition and condensation polymerization. A copolymer with ordinary parylene forms an insoluble film having a measured contact angle, against water, of about 105°. Thus, the polymeric coating exhibits a high water repellency and self-cleaning behavior [38]. 

The water-repellent coating film is produced by the following procedure. After sol-gel derived Si02 intermediate film having the thickness of 100 nm is applied on the clean surface of the glass substrate, two or three layers of FAS (RfSi(NCO)3) and RS (-(Si(CH3)20) -(Si(CH3)(Rf)0)TO-(Si(CH3)(X)) -) are applied and cured at room temperature. 

Chem. Descrip. Phosphated nonylphenol ethoxylate Uses Film-former in metalworking applies. surfactant for dry cleaning, PVAc emui-sion polymerization, heavy-duty cleaners, textiles (water repellent finishes) Features Reacts readily with alkalinity sources, making it easily incorporated into water-based fluids when exposed to temps, common in metal-forming operations, its f Im-forming props, reduce heat and improve tool life Properties Yel. si. hazy liq. sp.gr. 1.108 vise. 13,200 cp pH 2.16 (10%) 2.8% P Use Level 1-15%... 

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