Paint performance

The hot rolling of steel produces a surface layer of complex oxides known as millscale . It is unstable, losing adhesion upon weathering, and must be removed prior to painting if predictable paint performance is to be obtained. 

Comparisons of Pretreatments-. A Background to the Corrosion of Steei and its Prevention, No. 3, Effect of Surface Preparation and Paint Performance , 20, The Corrosion Advice Bureau of B.I.S.R.A. 

Figure 12 shows the HPGPC DRI traces of four high solids acrylic oligomers. The results of paint performance evaluation... 

Yebra, D.M., Kiil, S.Z., Weinell, C.E., Dam-Johansen, K. Parametric Study of Tin-Free Antifouling Model Paint Performance Using Rotary Experiments. Submitted for publication to Biofouling (2005b). 

UV and/or heat stabilized improved colour and gloss retention cold-temperature ductility and flexibility soft touch food contact low hardness conductive high stiffness high-impact ultra-high impact high modulus colourable scratch resistant paint performance electrostatic painting. .. 

Our electrochemical work differed drastically from the Groseclose work in that polymer coated metal samples were employed. Furthermore, we found that coatings can have corrosion resistance when their rest potentials are either more noble (B210/NVP) or less noble (B210/GBL) than the uncoated substrate. Leidheiser (22,23) examin zinc phosphate pretreated panels with automotive primer after 10 days exposure to the salt spray. The start and finish rest potentials of the samples with good paint performance were consistently more negative than those samples with poor paint performance ... 

Alternating Current Impedance Utility in Evaluating Phosphate Coating, Phosphorus-Chromium Rinse, and Paint Performance... 

With this paint system (CR) laboratory tests correlate quite well with the results in the atmosphere. So, in the salt fog chamber the worst paint performance is shown by this system, which is also the only one that shows slight rusting in the ASTM G 53 test. The DEF-1053 test promotes blistering in this system, as well as in the 0/A,A and V systems. 

The rate of adhesion loss in tests of paint performance can be greatly influenced by coating formulation and resin type (24) this is illustrated qualitatively by the results shown in Table II. To a first approximation, the anodic inhibitor pigments commonly used in... 

Anti-fouling tests were carried out on brush coated plastic laminate panels which had been given a primary coating of anti-corrosion paint. Performance was measured by visual observations of the panels after prolonged immersion (4 - 12 months) in a known high-fouling estuarine environment. 

The final latex paint performance properties of HMHEC polymers prepared with benzyltrimethylammonium hydroxide appear to be the same as HMHEC polymers prepared with sodium hydroxide. 

Previous research on acid deposition effects on wood coatings did not take into account the effect of the substrate but linked poor performance in acid environments to the extenders in the paint. It should be relatively easy to formulate paints to overcome this erosion problem. However, in wood it is catastrophic failure that causes most poor-paint performance. Thus, the effect of acids on this interface failure should be addressed in future work. 

The introduction of these new rheology modifiers provides paints manufacturers with a very attractive alternative to cellulosic thickeners. These rheology modifiers are the first acrylic associative thickeners that offer a similar rheology, in-can feeling, appearance, and application properties as cellulosic thickeners. They also show some key advantages compared to cellulosic thickeners. Supplied as liquids, they are easier to handle and because of their polymeric chemistry, they are less sensitive to microbial attack In application trials, professional painters found that new rheology modifier based paint performs similarly to cellulose thickened paint but with a better spattering resistance. 

Work in Spain (Guillen and Feliu, 1970) on painted, thermally sprayed zinc immersed in seawater showed that epoxy resin and polyurethane paints performed especially well. 

Paints do not penetrate the wood surface too deeply. A surface film is formed while obscuring the wood grain. Paints perform best on smooth, edge-grained lumber of light-weight species. If the wood becomes wet the paint film blisters or peels. 

Conventional thickeners - When conventional thickeners dissolve, their randomly coiled and entangled polymer chains occupy a large hydrodynamic volume immobilizing interstitial water. Although paint performance properties are a function of low and high shear viscosity, it is normally a moderate shear viscosity which guides processing quality control and the user s perception of paint consistency and quality. Moderate shear viscosity... 

Crosslinkers generally used to cure and modify the properties of alkyd/polyester resins include amino resins, phenolic resins, polyisocyanates, epoxy resins, silicone resins and vinyl monomers. In this section, the curing mechanism with amino resins and vinyl monomers will be mainly discussed. Also, the importance and influence of such curing reactions on paint performance will be briefly summarized. However, no attempt will be made here to review the structural influence of basic components in the resins on paint performance. This has recently been comprehensively reviewed. ... 

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