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Study on Surface-Modifition and Artificial Aging of the Commercial Bronze Powder Made in China

Author: WangXiuChun
Tutor: ZhaoMaiQun
School: Xi'an University of Technology
Course: Materials Science and Engineering
Keywords: bronze powder surface-modification offset print gloss scale-up trial artificial aging
CLC: TB383.3
Type: Master's thesis
Year: 2009
Downloads: 11
Quote: 0
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Abstract


Aiming at the status quo of low print gloss of China-made bronze powder and several-month natural aging needed in industry production in order to enhance the print gloss and stabilitate hue, the relationship between floating ratio, print gloss and morphology in offset gold ink and surface modification were studied through modification of China-made bronze powder. The impacts of single modifier and composite modifiers on bronze powder were analyzed, and scale-up trial was carried out with optimal technics. Studies of artificial aging time and temperature on the hue of bronze powder and print gloss were preliminary discuss. The results showed as follow:(1) Single modifiers and composite modifiers all improve print gloss and floating ratio of China-made red-golden bronze powder, and the modification effect of composite modifiers are more prominent. The gloss value of bronze powder modified by stearic acid and polymers compounding on the ratio 1:0.3 is up to 103.9, which is improved by 40% and close to international advanced level.(2) The floating ratio and dispersion are meliorated and orientation of bronze powder in offset gold ink is improved through surface modification. The floating ratio and orientation in offset gold ink have very high correlation with print gloss.(3) A scale-up modification trial was studied on China-made green-golden bronze powder. The highest offset print gloss value of bronze powder modified can reach 83.9,which is higher by 245.3% than before modification. The biggest water covering powder is 7078.7 cm2/g,higher by 57.3%. The effect of scale-up trial is better, laying the foundation for modification of bronze powder to industrialization.(4) Artificial aging significantly improve offset print gloss, and the effects are as much as natural aging. The print gloss show parabola with aging time increasing and there are maximum value and accordingly the best time. The artificial aging could increase the reflectivity of the yellow ray and the red ray. The color of bronze powder turns from light yellow,yellow to red with higher aging temperature and longer aging time.

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