By Ian R. Wheeler
There has been an upsurge of curiosity lately within the use of steel pigments. metal pigments are present in many gadgets that we use daily from home goods and activities items to the coatings on scratch playing cards. color is among the key elements that affects a buyer paying for a retail product. within the ‘fashion markets’, visible visual appeal is very vital and has a tendency to return good prior to performance. it's in those markets that steel pigments come into their own.
steel Pigments In Polymers is the proper simple consultant for someone who's approximately to begin operating with metal pigments but additionally features a wealth of knowledge in the event you already use those pigments. it really is was hoping that this booklet can assist present clients to accomplish the very best results with metal pigments and inspire those that haven't but used them to discover their power so as to add price to their products.
matters coated are:
* creation and history
* steel pigment types
* Pigment characteristics
* supply forms
* comparability of mass pigmentation and coating
* Mass pigmentation software characteristics
* movement and weld strains in mass pigmented applications
* formula of mass pigmented polymers
* Conversion processes
* purposes of steel pigmented coatings
* Powder coatings
* Non-coloristic applications
* well-being, protection and handling
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Extra info for Metallic Pigments in Polymers
Such a process can be operated more economically than that used for cut foil glitter, especially at the low particle size end of the spectrum. The apparent limitation of lack of geometric regularity is not a constraint in practice, as the eye is not easily able to detect the difference in particle shape up to about 300 µm. It is the light reflecting ability of the flake that appears to be the important factor. 15 ‘Glitter’ flake obtained by cutting aluminium foil [1 cm = approx. 50 µm] 52 Pigment Characteristics equivalent visual effect, it is generally necessary to use a wet milled flake of a rather greater diameter than a cut foil square.
This oxide surface is highly porous, with a surface area around five times that of the starting material. Although UV stable and shear resistant, the products, trade named Aloxal, are not totally water stable. They must be further protected by hydrophobic inhibitors, such as phosphates. An unusual process for creating colours on titanium particles was developed by Greening and Clegg . Fine particle size titanium is agitated in an aqueous electrolyte and subjected to a voltage of 5-100 V, preferably direct current between immersed anode and cathode.
As none of the metal pigments in significant commercial use melts below 420 °C, their physical integrity will comfortably survive the highest temperatures attained in polymer processing equipment. Visual changes that occur are associated with chemical reactions of the metal surfaces with components of the polymers or coatings in which they are incorporated. Gold bronze and copper have some deficiencies in this respect above 200 °C during polymer processing, unless they are of the coated type. Lightfastness of all metal pigments is generally good.