By G. Davison, B.C. Lane
Ingredients in Water-borne Coatings covers either present know-how and the long run analysis for the most important ingredients utilized in water-borne coatings this day. It brings jointly foreign services to supply a complete, sensible evaluation of the sector, its course, and choice of key ingredients at the moment hired for in-depth remedy in their use, behaviour and scope by way of professional practitioners in these ingredients. This well timed ebook comprises very good plenary chapters reviewing the advancements including the regulatory and legislative scene within the total box. It additionally comprises seven in-depth chapters dedicated to key additive forms, in particular; rheology modifiers, matting brokers, floor energetic brokers, dispersants, defoamers, and biocides. additionally, the publication offers: ·a systematic method of additive choice - additive principles - for the advance of a coating ·a stable realizing of the biocidal degradation results and the most important biocide strengths and weaknesses in addressing them ·the reader with a radical knowing of silica-based matting brokers and their mode of motion ·useful overviews of water borne dispersants, silicone floor lively brokers and cellulosic and associative thickener rheology modifiers This key ebook amalgamates the various newest advancements during this box and offers an authoritative resource of data for the learn neighborhood and people within the undefined, in addition to offering necessary details to graduate and postgraduate scholars.
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Extra info for Additives in Water-Borne Coatings (Special Publication)
Mixture diagrams [ 11 are a useful way of representing formulating options for all or part of the formulation and can subsequently used to display property contour plots. / Additives or Modifiers I ey Coating Properties . t ; . Dry Paint Film Pignents and Extenders Figure 1 Paint components and their relationship to Key Coating Properties In the case of compositions containing a volatile carrier or solvent, it is enough to spec@ the volume solids and pigment volume concentration in order to illustrate the essential character of the composition.
All of those problems are described in great detail elsewhere7. The development of high molecular weight polymeric dispersants has been driven by the need to improve the desirable characteristics of this additive group whilst minimising or eliminating the negative aspects. For example, stronger pigment wetting effects are found with additives containing multiple anchor groups. These are much less likely to desorb from the surface of the dispersed pigment and cause interface problems such as foam.
The relative balance of these two mechanisms depends on the type of rheology modifier. The hydrophobic groups mainly associate with emulsion particles through surface adsorption. This network formation generates a major increase in viscosity, it reduces the mobility of the particles. It also gives a uniform stable dispersion of both pigment and emulsion particles, thus contributing to greater ultimate gloss potential Their thickening efficiency will depend on the type and the number of hydrophobic groups per polymer chain and the molecular weight.