Of copper powder in an aqueous feed, there are problems such as prone to corrosion, the hue changes.
The use of physical and chemical methods in bronze powder-coated surface of organic and inorganic.It studied through different reagent-coated copper powder processing oxygen uptake in weakly alkaline aqueous medium,calculate the inhibition efficiency, and differential thermal analysis of the different treatment of copper powder coated antioxidant properties at high temperatures.For water-based gloss bronze powder of low status, the use of mechanical force chemical modifies surface of copper powder.It studied the influence of surface modification on copper powder in an aqueous dispersion of connecting compound, alignment and floating performance and analyzing its mechanism of action, exploring the relationship between the various properties, and surface treatment reagents optimized copper powder.
The main findings are as follows:
(1)root cause of aqueous copper powder corrosion and hue change is due to the oxygen reaction takes place in a weakly alkaline aqueous solution.
Organic acids and SiO2 coated copper powder can effectively inhibit oxygen corrosion of copper powder. Citric acid, which can be generated with a metal chelate, is the best corrosion inhibition efficiency reaching 95.83%, followed by ascorbic acid 90.28 %.
(2)Salt and saturated fatty acid modification and coupling are able to improve the dispersion stability of the aqueous bronze powder, which mainly depends on the activity of a hydrophobic group and anion.The long chain hydrocarbyl of the dispersion stability is better than short chain hydrocarbon group, an anionic high activity better than low activity.
(3)Copper powder floating depends on the used surface modifier and the arrangement of the copper powder in reagent outermost surface groups. It does this by changing copper powder density to affect wettability to affect the surface properties of copper
powder, thereby affecting the buoyancy.Not the worst point wettability floating rate corresponding to the maximum value.
(4)gloss water-based ink is impact by polishing of gold bronze powder,the modified reagent type and dispersion and floating capability of gold bronze powder in an aqueous liquid. When the agent is once adsorbed, the gloss depends on the rate of dispersion, while the secondary adsorption, mainly depending on the floating rate.
(5)In optimizing reagent, the amount of the antioxidant effect most on the gloss of the aqueous copper powder, followed by the type of antioxidant. Selecting 0.1% salicylic acid as an antioxidant, which is combined with
surface modifiers, can effectively improve the water-based gloss bronze powder.
(6)Using 0.6% double hydrocarbon chain modifies copper stearate powder surface , enabling water-based gold ink up to 72.02,compared with unmodified gloss powder improves 91.34%, reaching the level of solvent-based gold ink.