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Application of thermal reversible piezo-chromic dye in inkless printing technology

A piezochromic, ink-free printing technology, applied in the direction of color-changing fluorescent materials, organic dyes, styrene-based dyes, etc., can solve the problems of restricting rewritability and readability, and insufficient contrast of color changes, etc. Effects of reusability and readability, ease of implementation, and readily available raw materials

Active Publication Date: 2022-03-29
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0007] However, most of the usual piezochromic materials have the defect of insufficient contrast of color change caused by mechanical force. Generally, high color contrast can only be observed under ultraviolet light, which restricts its use in sunlight or office environments. rewritable and readable

Method used

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  • Application of thermal reversible piezo-chromic dye in inkless printing technology
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  • Application of thermal reversible piezo-chromic dye in inkless printing technology

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Embodiment

[0041] Application of thermoreversible piezochromic dyes in inkless printing technology. The present invention firstly designs and synthesizes a class of anthracene derivatives with thermally reversible piezochromic properties with high sensitivity, high stability and high contrast, and selects the best ones after measuring their piezofluorochromic properties, and then sprays them into It is loaded on the filter paper to make thermally reversible printing carbon paper, and finally the edited pattern is printed by a dot matrix printer with the ribbon removed, and the pattern can be erased by heating to achieve the purpose of reuse.

[0042] The preparation steps are as follows:

[0043]1) Synthesis of 9,10-bis(4-formyl styryl)anthracene: under argon protection and ice bath conditions, add dropwise to t-BuOK (595mg, 5.3mmol) in THF solution (10mL) A mixed solution of 9,10-bis(diethylphosphinomethyl)anthracene (950 mg, 2 mmol) and terephthalaldehyde (670 mg, 5 mmol) in THF (30 m...

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Abstract

The invention relates to application of a thermally reversible piezochromic dye in an ink-free printing technology. The molecular structural formula of the prepared anthracene derivative with the thermal reversible piezochromic property is as follows: 9, 10-bis (diethyl phosphinomethyl) anthracene is taken as a raw material, and an intermediate 9, 10-bis (4-formyl styryl) anthracene is obtained through a wittig-horner reaction; the preparation method comprises the following steps: carrying out a wittig-harner reaction on 9, 10-bis (4-formyl styryl) anthracene to obtain DSA1; the preparation method comprises the following steps: carrying out Knoevenagel condensation reaction on 2, 4, 6, 9, 10-bis (4-formyl styryl) anthracene to obtain DSA-CN0-6. The preparation method has the advantages that the preparation method is simple in process, the raw materials are easy to obtain and easy to implement, and the prepared reversible printing carbon paper has the characteristics of high sensitivity, high stability and high contrast ratio, meets the requirements of reusability and readability in daily life scenes and has very high application value.

Description

[0001] technology neighborhood [0002] The invention belongs to the technical field of new materials, and in particular relates to the synthesis of a series of anthracene derivatives with piezochromic properties and making them into reusable thermoreversible printing copy paper. Background technique [0003] The invention of paper has greatly contributed to the development and spread of civilization, and even in today's digitalized world, paper still plays a key role in socio-economic growth. Unfortunately, the use of paper comes at the cost of depleting natural resources. Therefore, there is an urgent need for an environmentally friendly and cost-effective technology to achieve paper reuse. In recent years, the discovery of a class of "smart materials" with color conversion under external stimuli (such as heat, light, mechanical stress, etc.) has given people new inspiration. [0004] The phenomenon that materials change color in response to mechanical stimulation is calle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/10C09B23/14C09K9/02
CPCB41M5/10C09K9/02C09B23/141C09B23/143C09K2211/1007C09K2211/1011
Inventor 王秋生余子安张宇乾
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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