【作者】 朱丽霞；

【导师】 赵麦群；

【作者基本信息】 西安理工大学 ， 材料学， 2006， 硕士

【摘要】 本文针对铜金粉在水性连接料中容易产生腐蚀、色相发生变化的问题,采用物理法和化学法在铜金粉表面进行有机和无机包覆,研究了经过不同试剂包覆处理的铜金粉在弱碱性水性介质中的吸氧量,计算了缓蚀效率,并用差热分析方法研究了不同包覆处理的铜金粉在高温下的抗氧性能;针对水性铜金粉的印金光泽度低的现状,采用机械力化学法对铜金粉进行表面改性,研究了表面改性对铜金粉在水性连接料中的分散性、定向排列和漂浮性能的影响,并分析其作用机理,探讨各性能之间的关系,并对铜金粉的表面处理试剂进行了优化。主要研究成果如下:(1)水性铜金粉发生腐蚀和色相改变的根本原因是由于在弱碱性水溶液中发生了吸氧反应。有机酸和SiO2对铜金粉的包覆均能有效地抑制铜金粉的吸氧腐蚀,其中柠檬酸能够与金属生成鳌合物,缓蚀效果最佳,缓蚀效率达到95.83%,其次为抗坏血酸90.28%。(2)饱和脂肪酸及其盐和偶联剂的改性都能够提高水性铜金粉的分散稳定性,主要取决于疏水基以及阴离子的活性,分散稳定性为长链烃基优于短链烃基,阴离子活性高的优于活性低的。(3)铜金粉的漂浮性取决于所使用的表面改性剂和试剂在铜金粉表面的最外层基团的排列状况,它通过改变铜金粉的密度、润湿性等来影响铜金粉的表面性质,进而影响铜金粉的漂浮性;并非润湿性最差的点对应飘浮率最高值。(4)水性金墨的光泽度同时受铜金粉的抛光效果、改性试剂种类以及铜金粉在水性调金液中的分散性和漂浮能力的影响,当试剂为一次吸附时,光泽度主要取决于分散率,而二次吸附时,则主要取决于飘浮率。-(5)在试剂的优化中发现,抗氧剂的添加量对水性铜金粉印金光泽度的影响最大,其次为抗氧剂的种类,选择0.1%的水杨酸作为抗氧剂与表面改性剂联合使用即能有效提高水性铜金粉的印金光泽度。(6)用0.6%双烃链硬脂酸盐对铜金粉进行表面改性,能够使水性金墨的光泽度高达72.02,较未改性粉末的印金光泽度提高了91.34%,达到溶剂型金墨的水平。更多还原

【Abstract】 Bronze powder corrodes in aqueous alkaline media and changed the hue of color, Organic and inorganic coatings of the bronze powder were realized by physical and chemical methods. Study the oxygen absorption of water-borne bronze powder with different coating in the aqueous alkaline medium and calculate the inhibit rate. The inoxidizability of bronze powder with different coatings was studied by differential and thermogravimetry analysis. Aimed at the status quo that low gloss of water-borne gold ink, surface modification of bronze powder was realized though mechano-chemistry. Studied the impact of modifier on dispersion、orientation and leafing property of bronze powder in the water-borne binder, analyzed the mechanics, probed into the relationships between properties. Though the result, the surface modifier was optimized. The results showed that:(1) The essential of corrosion was bronze powder corrode in aqueous alkaline media with absorption of oxygen. Organic and inorganic coatings can inhibit the oxygen absorption corrosion of bronze powder in the aqueous alkaline medium, the inhibit ability of citric acid is best due to the formula of metal chelate, which anticorrosive rate reach to 95.83%, then is ascorbic acid, anticorrosive rate was 90.28%.(2) The dispersion stabilize of water-borne bronze powder can be improved modifying with saturated fatty acid, fatty soap and resin acceptor. It was mainly depended on hydrophobic group and activity of anion. Long-chain alkyl precede to short-chain alkyl, high activity of anion precede to low activity.(3) The leafing property of bronze powder was depended on modifier and the arrange of outermost group. They changed the surface state and reduced the specific gravity of bronze powder which has an impact on the leafing properties; The standpoint that poorest wetting property correlated to the highest leafing was not stand up.(4) The gloss of water-borne gold ink was affected simultaneity by polishing effect, the kindof modifier, and dispersion and leafing property of the powder, when modifier was primary adsorbed, the gloss was mainly depended on dispersion rate, whereas on leafing rate when modifier was secondary adsorbed.(5) The addition mount of antioxygen affect the gloss most, and then is its kind. 0.1% salicylic acid adapt with modifier can improve the printing gloss effectively.(6) The print gloss of water-borne bronze powder was 72.02 and enhanced 91.34% when added in 0.6% double hydrocarbon chain fatty soap, was superior to the advanced level of solvent base gold ink.更多还原