By Charles Tanford
Hardcover - December, 1961
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Extra so than any of the opposite significant teams of components within the periodic desk, the transition metals have formed human heritage and feature been the workhorses of undefined. the invention of metal copper ended the Stone Age and ushered within the Bronze Age. Alloys of iron (especially metal) later took over, and the Iron Age changed the Bronze Age.
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A minimum explosion limit of 156 g/ m3 has been set and the spontaneous ignition temperature is approximately 370 'C. Apart from this, the material is stable, and the LDSovalue for rats is more than 5 g of product per kg. As far as eye irritation tests are concerned, it has been reported that rabbits showed a slight lens irritation after exposure to a cellulose ether. 1 Introduction The development of polyurethane or PUR (abbreviation PU used in US literature) thickeners is one of the most important advances in the area of rheological additives.
The demand for a less pseudoplastic rheology arose. This led to the introduction of associative thickeners such as associative acrylic thickeners and polyurethane thickeners. As a response, a cellulose-based associative thickener was developed. The mode of action of such a product is shown in Fig. 2-10. 2-10. The mode of action of associative thickeners The base polymer is either hydroxyethyl cellulose or ethylhydroxyethylcellulose. The molecular weight of the base polymer is significantly lower than that of waterphase thickeners, e.
To ensure proper dispersion of the pigment and the fillers it is important that the thickener should not negatively influence the degree of dispersion. 2-3. Influence of the choice of celluloseether substituentonvariouspaint properties Poorest results Pigment dispersion Foaming Thickening efficiency Storage stability Biostability Spreadability Brush viscosity Spatter resistance Rheology Sag resistance Water retention Colour development Scrub resistance HEC HEC MHEC HEC HEC HEC MHEC MHEC MHEC HEC HEC HEC HEC Best results CMC CMC HEC EHEC EHEC EHEC CMC HEC CMC EHEC CMC CMC MHEC EHEC EHEC EHEC MHEC MHEC CMC HEC CMC HEC CMC EHEC EHEC EHEC MHEC MHEC CMC CMC CMC MHEC EHEC EHEC EHEC MHEC MHEC MHEC CMC 42 3 Thickeners are obtained with hydroxyethyl cellulose.
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