基于显色剂/显影剂二元体系的水致变色可重复擦写材料

Hydrochromic rewritable paper and water-jet printing have attracted much attention due to their reversibility, energy conservation, emissions reduction, cleaning and environmental protection. However, the current color of water-jet prints is very limited due to structural limitation of hydrochromic dyes. Especially, the black prints for water-jet printing are not implemented. In this proposal, hydrochromic binary system of chromogenic agent / developer will be developed for hydrochromic rewritable paper, and its key factors influencing hydrochromism of the binary system will be clearly studied. Based on this binary system, methods for improving performance and preparation of hydrochromic black rewritable paper with high color purity and contrast will be explored. Further, different matched pairs of chromogenic agent / developer will be searched for obtaining a series of hydrochromic rewritable papers with colors covering the whole visible region. The implementation of this project not only promotes the theoretical research on hydrochromic system, but also greatly expands the color display range for water-jet rewritable materials, especially for black water-jet prints. It will further lay the foundation and promote the practical applications for water-jet printing.

水致变色可重复擦写纸及无墨喷水打印，因其具有可重复擦写、节能减排、清洁环保的特点，备受关注。然而，由于受水致变色染料种类的限制，一元水致变色体系实现的喷水打印颜色的种类非常有限，尤其是应用最广的黑色喷水打印仍未得到解决。本项目拟开发出显色剂/显影剂二元水致变色体系，探索影响二元体系水致变色的关键因素；基于黑色显色剂/显影剂二元水致变色体，探索高色纯度、高对比度黑色显示的水致变色可重复擦写纸的实现方法、性能调节及制备；进一步探索通过改变不同显色剂，筛选出匹配的显影剂，制备得到颜色覆盖整个可见区的一系列水致变色可重复擦写纸。本项目的实施，不仅对扩展水致变色体系的理论研究有促进作用，而且可以大大拓展水致变色可重复擦写材料的颜色显示范围，尤其有望突破黑色喷水打印显示，这将进一步为无墨喷水打印的应用推广奠定基础。

水致变色可重复擦写材料及无墨喷水打印技术，因其具有可反复擦写、绿色环保的特点，备受关注。然而，由于受染料种类的限制，基于分子开关染料的一元水致变色体系能实现的喷水打印颜色的种类非常有限，尤其是应用最广的黑色喷水打印仍未得到解决。本项目创新性地提出了基于显色剂/显影剂的二元水致变色体系构筑水致变色可重复擦写材料的策略。通过对一系列不同性质的显影剂与显色剂在固体基质上的水致变色性质的详细考察，提炼出影响二元体系水致变色的关键因素为显影剂的给质子能力、亲脂性以及与显色剂的空间构型匹配性；并成功实现了高色纯度、高对比度的黑色喷水打印可重复擦写纸的制备。进一步地，分别以常见的酸致变色荧烷类染料、三芳甲烷类染料及噁嗪类染料作为显色剂，以对羟基苯甲酸苯甲酯作为显影剂，制备得到了几乎覆盖了整个可见区的其它各颜色显示的水致变色可重复擦写纸，验证了本项目提出的显色剂/显影剂二元水致变色体系是具有普适性的。本项目的实施，不仅对扩展水致变色体系的理论研究有促进作用，而且可以大大拓展喷水打印颜色显示范围，尤其突破了黑色喷水打印显示的瓶颈，这将进一步为无墨喷水打印的应用推广奠定基础。此外，这种基于显色剂/显影剂二元体系开发水致变色材料的策略，也可为其它刺激-响应可重复擦写材料的设计与制备提供借鉴。