General Reference

Additives for Coatings by Johan Bieleman

By Johan Bieleman

Doubtless: an ideal coating has to seem fantastic! yet different houses of coatings also are most crucial. Coatings need to be sturdy, tricky and simply appropriate. ingredients are the major to luck achieve those features, although the quantities utilized in coating formulations are small.It isn't really trivial in any respect to choose the easiest ingredients. In perform, many sequence of exams are frequently useful, and the consequences don't clarify, why a definite additive improves the standard of a coating and one other one impairs the coating.This e-book is devoted to builders and candidates of coatings operating in learn or creation, and it truly is geared toward delivering a handbook for his or her day-by-day paintings. it is going to solution the subsequent questions: How do crucial teams of additions act? Which results might be be accomplished via their addition?Scientific theories are associated with sensible purposes. Emphasis is wear the optical facets which are most crucial for the functions in practice.This booklet is a milestone in caliber insurance within the whole box of coatings!

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5 Influence of Organoclays on Various Coating Properties Rheological processes are important during production, storage, and application of coating materials; see Fig. 2). ) the shear rates vary between approxi- 4 . 1-12. Shear rates during production and application of coatings 3 Thickeners 26 mately 102-105 s-I. During storage and transportation of the end product the relevant shear rate is quite low, below 1 s-I. Mixing and homogenizing just before the application of the paint are effected at 10-lo2 s-I.

The main functions of thickeners in paint systems can be summarized by three key terms : 1. Stability 2. Solvent retention 3. 3 these specific aspects will be considered in detail for the various products. 3 in which the various products are described individually. 2-3. [^-"] Worldwide, some 35 000 tons, a considerable volume, of non-ionic cellulose ethers are used each year as thickeners in latex paints. In this section both the traditional cellulose ethers and the associative cellulose ethers used in latex paints will be considered.

The resultant organoclay suspension is subsequently filtered off. 1-4. Production scheme for organoclays 1 Water 2 Smectite 3 Vapor 4 Centrifuge 5 Residues 6 Quaternary ammonium compound 7 Centrifuge 8 Dispersion tank 9 Mixer 10 11 12 13 Water Reaction tank Rough filter Drier 14 Filter 15 Grinder 16 Air separator 17 Packing takes place simultaneously with this step, to quantitatively remove the NaCl formed during the reaction. The filtrate paste is then dried. Finally, grinding takes place, and the organoclay is ready to be offered commercially, usually in powder form.

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