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印花镍网的电铸添加剂研究

作者:完美论文网  来源:www.wmlunwen.com  发布时间:2019/11/1 9:21:55  

摘要:镍网是圆网印刷机的必要组成部分,更是圆网印花技术发展的关键材料之一。目前电铸是镍网生产的主要方式,为了保证花型图案精细美观,镍网的厚径比要尽量的大,在电铸镍网工艺过程中镍网的厚度和镍网的孔径是衡量电铸液性能的重要指标。一般而言,在直流电铸过程中,由于不平的镍网结构导致从镍网表面到孔内电流密度逐渐减小,电流于镍网孔口处集中分布,造成镍网孔径减少,电铸过程中使用有机添加剂是提高镍网孔径大小非常有效且经济的办法。

本文以电铸镍网的厚径比和镍网的力学性能作为衡量指标对电铸镍网主盐浓度和工艺条件进行了优化,优化结果为:150 g·L-1硫酸镍、40 g·L-1氯化镍、35 g·L-1硼酸、0.28 g·L-11,4-丁炔二醇、0.1 g·L-1十二烷基硫酸钠,电流密度10 A·dm-2,电铸液温度为40 ℃,pH为3.5。参照添加剂官能团进行分类研究,以SH110和PPS、2-氨基乙硫醇和L-半胱氨酸、曲拉通和JGB三组不同结构添加剂作为切入点,通过研究添加剂与电铸镍网厚径比的关系,最终筛选出效果最好的三种添加剂:SH110、2-氨基乙硫醇和曲拉通。然后,选择SH110、2-氨基乙硫醇和曲拉通组成复合添加剂体系,当SH110浓度为3 mg·L-1;2-氨基乙硫醇浓度为10 mg·L-1;曲拉通浓度为10 mg·L-1时,镍网厚径比达到10.6。

在优化电铸液配方中,使用旋转圆盘电极考察不同转速下线性伏安曲线的特点,分析了添加剂对电铸液电化学行为的影响,系统研究了各种添加剂在电铸镍网中的作用机理。研究表明,1) SH110可以在强对流区促进镍离子的沉积,在弱对流区抑制镍离子的沉积;PPS主要作用在强对流区,促进镍离子在镍网表面的沉积,可以有效提高镍网的厚径比。2) L-半胱氨酸与2-氨基乙硫醇相比,分子结构上多了羧基,由于羧基容易被水分子包裹限制了L-半胱氨酸对镍离子的促进作用,使得L-半胱氨酸不利于镍网厚径比的提高;而2-氨基乙硫醇在强对流区有更强的吸附作用,促进了镍离子在镍网表面的沉积,提高了镍网的厚径比。3) 曲拉通在强对流区对镍离子的促进作用强于弱对流区的作用,这样有利于镍网孔内外镍离子沉积速度差异的增大,有利于镍网厚径比的提高;JGB在弱对流区对镍离子的促进作用比强对流区对镍离子的促进作用强,不利于镍网厚径比的提高。

The nickel mesh is an indispensablecomponent of the circular screen printing machine, and it is one of the keymaterial issue for the development of the printing and dyeing industry. Inorder to pursue precise printing pattern, higher aspect ratio of nickel mesh ishighly desired. In the electroforming process, the thickness of nickel mesh andmicrovia diameter of the nickel mesh are important criteria to measure theperformance of electroforming solution. Generally, unsmooth microvia causes thecurrent density decreases from the board surface of nickel mesh to the innersurface of microvia during direct current electroforming process. The unevenlocal current density gives rise to the shrink of the microvia. In order toimprove the aspect ratio of the nickel mesh, in an effective and economicalway, it is urgent to find out organic additives to increase the aspect ratio ofnickel mesh.

The nickel electroforming process wereoptimized to obtain the higher aspect ratio and better mechanical property andthe optimized formula was 150 g·L-1 NiSO4, 40 g·L-1 NiCl2, 35 g·L-1 H3BO3, 0.28g·L-1 C4H6O2 and 0.1 g·L-1 C12H25OSO3N, 10 A·dm-2, pH 3.5 and 40 ℃. Accordingto the molecular structure, three groups of additives with different structurewere selected, using SH110 and PPS, 2-aminoethanethiol and L-cysteine, TritonX-100 and JGB. Three kinds of additives with better effect on increasing aspectratio were identified: SH110, 2-aminoethanethiol and Triton X-100. The aspectratio of nickel mesh carried out with the optimized formula and the followingparamers, SH110 3 mg·L-1, 2-aminoethanethiol 10 mg·L-1and Triton X-100 10mg·L-1, was up to 10.62.

Linear sweep voltammetry was employed tosystematically study the function of each additive. The results indicated that:1) SH110 has a promoting effect  in highdiffusion region of plating solution and has an inhibiting effect on the nickelmesh electroforming in low diffusion region of plating solution. PPS has apromoting effect on the nickel mesh electroforming in high diffusion region,which can increase the aspect ratio of nickel mesh. 2) Compared with2-aminoethanethiol, the carboxyl group in L-Cysteine could form hydrogen bondwith H2O, and thus the transfer of electrons would be delayed by the wrappedstructure, which is against the increasing of aspect ratio. 2-aminoethanethiolshows a promoting effect on the nickel mesh electroforming in high diffusionregion, which can improve aspect ratio of nickel mesh. 3) In high diffusionregion, the promoting effect of Triton X-100 on increasing the aspect ratio isstronger than that in low diffusion region, which is beneficial to increase thedeposition rate difference between board surface and the inner surface ofmicrovia, and improve aspect ratio of nickel mesh. On the contrary, thepromoting effect of JGB in low diffusion region is greater than that in highdiffusion region, which is bad for improving aspect ratio of nickel mesh.

关键词:印花镍网;电铸;添加剂;厚径比

nickel printing mesh; electroforming;additive; aspect ratio

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