Abstract
Common synthetic dyes, e.g., Weak Acid Pink Red B (APRB, C.I. 18073), Mordant Blue 9 (MB, C.I.14855) and Acid Brilliant Blue 6B (ABB6B, C.I. 42660), can be removed from water by in situ hybridization with CaCO3, BaSO4 and Ca3(PO4)2 and the resulting hybrids thus prepared used as plastic colorants. All the hybrids can be processed into polypropylene (PP) at 200 °C with good color intensity, color brightness and homogeneous dispersion. The BaSO4-MB hybrid exhibits better migration resistance to acid and alkali, and stronger covering power than the BaSO4-MB mixture. The thermal stability and UV resistance of the Ca3(PO4)2-ABB6B hybrid are better than those of the Ca3(PO4)2-ABB6B mixture. The crystallinity of PP is enhanced by incorporation of these hybrids and the use of these hybrids as colorants in PP instead of the dyes alone is determined to be feasible.
Highlights
Three simulated dye effluents were treated with freshly prepared calcium carbonate, barium sulfate or calcium phosphate
The results indicated these salts all display high hybridization rates, i.e., 99% for APRB, 94% for MB and 99.98% for ABB6B (Figure 2)
The dye contents in the CaCO3-APRB hybrid, the BaSO4-MB hybrid and the Ca3(PO4)2-ABB6B hybrid were determined by elemental analysis to be 4.8, 4.1 and 23.4%, respectively
Summary
Inorganic pigments such as cadmium yellow, iron red, titanium white and copper green are often used as colorants to color plastic and rubber [1], but they lack good light transmission and they release toxic heavy metals in acidic media, which limits the availability of colours in some applications [2,3]. Organic dyes combined with inorganic materials show improved endurance [5,7]. Barium sulfate is resistant to acid and alkali, easy to disperse, and often used as a white pigment for paint [12]. Weak Acid Pink Red B (APRB, C.I. 18073), Mordant Blue 9 (MB, C.I.14855) and Acid Brilliant Blue
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