柔性基材用水性UV导电油墨的研制

以水合肼(N2H4·H2O)为还原剂,聚乙烯吡咯烷酮(PVP)为保护剂,通过液相还原硝酸银溶液制备纳米银粉。以制备的银粉纳米粒子为导电填料,以水性聚氨酯丙烯酸树脂为连接料,以乙醇和去离子水为溶剂,并辅以其他助剂,制备出水性UV导电油墨。经TEM表征和马尔文粒度仪测试,纳米银粉的平均粒径为5nm。最后用300目的涤纶丝网版在铜版纸基上印刷,在105℃下处理15min,用UV固化干燥后,测试墨层的电导率和附着力,并用SEM表征了墨层烧结后的形貌特征,结果表明:研制的用于柔性基材的水性UV导电油墨经190℃低温烧结2min,电导率为1.84×104S/m,经3M胶带撕拉,墨层不发生脱落现象。

水性UV导电油墨的研制

以水合肼(N2H4·H2O)为还原剂,PVP(聚乙烯吡咯烷酮)为分散剂,通过液相化学还原硝酸银溶液制备用于导电填料的纳米银粉。以制备的银粉为填料,水性聚氨酯丙烯酸树脂为连接料,乙醇和去离子水为稀释剂并辅以其他助剂,制备出水性UV导电油墨。经SEM表征和纳米粒度及电位分析仪测试,纳米银粉的平均粒径为23.67 nm。最后测试了油墨的导电性能、耐摩擦性能以及附着力。结果表明:所研制的水性UV导电油墨的电阻率为3.5×10-4Ω·m,印制的电路板经过2 500次以上的反复摩擦后,导电性能无明显变化,印刷后墨膜经3M胶带撕拉,不发生脱落现象。

水性UV固化油墨电导率和吸光度研究

本文研究了水性UV固化油墨连结料溶液中颜料与溶液电导率及吸光度的关系。结果发现,不同颜料的加入均导致水性UV油墨连结料溶液电导率和吸光度的增加。吸光度的增加可以认为是由于颜料颗粒在该体系的竞争性吸附中优先吸附了水,而颜料大量吸附水,有利于提高印刷后墨膜的干燥效率。电导率增大是由于颜料中存在杂质。如果颜料中含有大量杂质,可能会产生色差,这一点对于高档印刷应该加以注意。

Rational design and evaluation of UV curable nano-silver ink applied in highly conductive textile-based electrodes and flexible silver-zinc batteries

The possibility of printing conductive ink on textiles is progressively researched due to its potential benefits in manufacturing functional wearable electronics and improving wearing comfort.However,few studies have reported the effect of conductive ink formulation on electrodes directly screen-printed on flexible substrates,especially printing UV curable conductive ink on common textiles.In this work,a novel UV curable nano-silver ink with short-time curing and low temperature features was developed to manufacture the fully flexible and washable textile-based electrodes by screen printing.The aim of this study was to determine the influence of ink formulation on UV-curing speed,degree of conversion,morphology and electrical properties of printed electrodes.Besides,the application demonstration was highlighted.The curing speed and adhesion of ink was found depending dominantly on the type of prepolymer and the functionality of monomer,and the type of photoinitiator had a decisive effect on the curing speed,degree of double bond conversion and morphology of printed patterns.The nano-silver content is key to guarantee the suitable screen-printability of conductive ink and therefore the uniformity and high conductivity of textile-based electrodes.Optimally,an ink formulation with 60 wt%nano-silver meets the potential application requirements.The electrode with 1.0 mm width showed significantly high electrical conductivity of 2.47×10^(6)S/m,outstanding mechanical durability and satisfactory washability.The high-performance of electrodes screen-printed on different fabrics proved the feasibility and utility of UV curable nano-silver ink.In addition,the application potential of the conductive ink in fabricating electronic textiles(e-textiles)was confirmed by using the textile-based electrodes as the cathodes of silverzinc batteries.We anticipate the developed UV curable conductive ink for screen-printing on textiles can provide a novel design opportunity for flexible and wearable e-textile applications.

Rheological properties and screen printability of UV curable conductive ink for flexible and washable E-textiles

As a critical component for the realization of flexible electronics,multifunctional electronic textiles(etextiles)still struggle to achieve controllable printing accuracy,excellent flexibility,decent washability and simple manufacturing.The printing process of conductive ink plays an important role in manufacturing e-textiles and meanwhile is also the main source of printing defects.In this work,we report the preparation of fully flexible and washable textile-based conductive circuits with screen-printing method based on novel-developed UV-curing conductive ink that contains low temperature and fast cure features.This work systematically investigated the correlation between ink formulation,rheological properties,screen printability on fabric substrates,and the electrical properties of the e-textile made thereafter.The rheological behaviors,including the thixotropic behavior and oscillatory stress sweep of the conductive inks was found depending heavily on the polymer to diluent ratio in the formulation.Subsequently,the rheological response of the inks during screen printing showed determining influence to their printability on textile,that the proper control of ink base viscosity,recovery time and storage/loss modulus is key to ensure the uniformity of printed conductive lines and therefore the electrical conductivity of fabricated e-textiles.A formulation with 24 wt%polymer and 10.8 wt%diluent meets all these stringent requirements.The conductive lines with 1.0 mm width showed exceptionally low resistivity of 2.06×10^(-5)Ωcm Moreover,the conductive lines presented excellent bending tolerance,and there was no significant change in the sample electrical resistance during 10 cycles of washing and drying processes.It is believed that these novel findings and the promising results of the prepared product will provide the basic guideline to the ink formulation design and applications for screen-printing electronics textiles.

基于原位体积加成制备导电线路的研究

本文提出一种制备导电电路的方法。以纳米铜为导电填料,以光固化树脂为连接剂,制备含铜光固化油墨,利用丝网印刷方法获得含有纳米铜的图案,利用铜与银盐间的置换反应,将铜纳米粒子图案通过原位体积加成转化为导电银图案。研究结果表明,铜图案不具有导电性,而置换反应生成的银图案具有导电性,且导电能力受铜含量、银盐浓度、光照时间、浸泡反应时间等因素影响,本实验中获得的最高电导率为1.25×105 S/m,导电线路具有良好的耐弯曲、耐疲劳性能,同时兼具优异的可修复性能,为导电线路的制备提供了常温下简单有效、成本低廉的实现方法,具有重要的参考价值。

光固化导电喷墨油墨的固化过程和导电性能(英文)

为了满足目前精细电路板制作的需要,研制了一种含纳米银的光固化导电油墨,并研究了纳米银对双重固化和电导率的影响。通过将均一分散的纳米银溶液与光固化树脂、光引发剂和热引发剂混合来配制油墨。固化过程包括光固化和热固化两步。纳米银粉的添加量以及热处理的条件对电子率都有影响。结果表明:纳米银粉为固含量的70%时制得的导电油墨在200℃下处理5min,电阻率可达5×10-6Ω·cm。