TAILIEUCHUNG - Handbook of Plastics Technologies Part 10

Tham khảo tài liệu 'handbook of plastics technologies part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PLASTICS ADDITIVES PLASTICS ADDITIVES FIGURE CIE chromaticity diagram. and quinacridones produce reds disazos isoindolines and isoindolinones produce reds to yellows anilines produce orange monoazos produce orange to yellows anthraquinones diarylides and nickel azos produce yellows and phthalocyanines produce greens to blues. Overall there is a trend to give up inorganics of suspected toxicity and replace them by organics but the organics must be chosen carefully to retain the heat and light stability required in processing and using plastics. Criteria in Choosing Colorants A typical checklist includes dispersability rheology plate-out thermal stability appearance light fastness weathering migration and toxicity in both processing and use particularly in leaching from solid waste. Market Analysis In worldwide tonnage titanium dioxide is about 8 billion pounds. In plastics inorganic white pigments were 72 percent of the total market inorganic colored pigments 8 percent Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2006 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. PLASTICS ADDITIVES CHAPTER 5 FIGURE Organic colorants. carbon black 13 percent organic pigments 5 percent and dyes 2 percent. But recent trends have probably favored the replacement of inorganic by organic colorants. Prices for inorganic colorants are mostly 1 to 3 per pound and 3 to 30 for organic colorants. Compounding Techniques Powdered Color Pigments. The primary particles are individual crystals. These are firmly bonded into tight clumps called aggregates. These are further bonded into loose clumps called agglomerates. It takes skill and energy to disperse these into molten plastics and this is best done by experts. The average compounder processor may waste much time looking for the optimum technique. Colored Compound. .

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