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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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14.19.2 Recent advances in coalescing solvents 969<br />

Product group/<br />

compounds<br />

filled, reactive<br />

PUR-polymers<br />

solvent based<br />

composition,<br />

based on PVC<br />

acrylate<br />

dispersion, water<br />

dispersed<br />

adhesion,<br />

promotor<br />

Application<br />

sealants and<br />

adhesives/elastic<br />

products (floor<br />

joints, joints)<br />

coatings and<br />

corrosion prevention/impregnation,<br />

sealer<br />

coatings and<br />

corrosion protection/<br />

rigid coat (for<br />

concrete and dense<br />

mineral substrates)<br />

Hazardous ingredients,<br />

especially solvents<br />

3-isocyanatemethyl-3,5,5-trimethylcyclohexylisocyanate<br />

0,1-1%,<br />

N,N-dibenzylidenepolyoxypropylene<br />

diamine 1-2,5%,<br />

xylene 2,5-10%, ethylbenzene<br />

1-2,5%<br />

solvent naphtha 50-100%,<br />

1-methoxy-2-propanol<br />

2,5-10%,<br />

water-borne so-called<br />

solvent-free systems<br />

Relevant health and environmental<br />

risks<br />

sensitization, irritations, hazardous<br />

reactions (with amines,<br />

alcohols)<br />

irritations, flammable, neurological<br />

effects<br />

irritations (long-term contact),<br />

slightly water polluting<br />

References<br />

1 Ullmann´s Encyclopedia <strong>of</strong> Industrial Chemistry,1998.<br />

2 DIN 1045 (Deutsches Institut für Normung), Concrete and Reinforced Concrete. Beton und Stahlbeton,<br />

Beuth Verlag, Berlin (1988), part 1 (1997), part 2 (1999).<br />

3 Sika TechnoBauCD, Sika Chemie GmbH, Stuttgart (2000).<br />

14.19.2 RECENT ADVANCES IN COALESCING SOLVENTS FOR<br />

WATERBORNE COATINGS<br />

David Randall<br />

Chemoxy International pcl, Cleveland, United Kingdom<br />

14.19.2.1 Introduction<br />

The role <strong>of</strong> coalescing solvents in coating formulations, the factors which affect the choice<br />

<strong>of</strong> coalescing solvents, and the recent developments in esters <strong>of</strong> low volatility, low odor and<br />

rapid biodegradability for use in coating formulations are discussed.<br />

The term “paint” is widely used to describe a coating applied to a variety <strong>of</strong> substrates<br />

for protective or decorative purposes. “Paint” also implies a pigmented species, whereas<br />

“surface coatings” is a broader term for coating systems with or without pigments used for<br />

any coating purpose.<br />

All paint systems may be considered as a combination <strong>of</strong> a small number <strong>of</strong> constituents.<br />

These are: continuous phase or vehicle (polymer and diluent), discontinuous phase or<br />

pigment and extender, and additives.<br />

This paper is not concerned with the detail <strong>of</strong> paint formulation, but the polymer types<br />

most widely encountered are alkyds, polyurethanes and nitrocellulose in solvent based systems,<br />

and acrylics, styrene-acrylics, and copolymers <strong>of</strong> vinyl acetate in water-based coatings.

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