Reusable writing material and preparing method thereof

A matrix material and aryl technology, applied in the field of writing materials and their preparation, can solve the problems of difficult printing technology compatibility, damage to visual organs, and reduced stability of substrates, and achieve excellent reversibility, good repeatability, and damage small effect

Active Publication Date: 2018-05-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rewritable materials based on photochromism disclosed in the prior art are mainly based on the stimulation of ultraviolet light to realize color change. However, the ultraviolet laser source used is expensive, and the ultraviolet radiation produced not only has health risks (to skin damage to the visual organs), and at the same time, it will accelerate the chemical degradation of the display material and reduce the stability of the substrate used. In addition, in order to achieve different color rendering, it is necessary to design and synthesize photochromic molecules with different structures, which increases the cost of use. and difficulty, not conducive to industrial production
[0004] In 2016, Rahul Banerjee's research group in India reported rewritable materials based on metal-organic framework (MOF) compounds, but the rewritable materials obtained had poor reversibility
The YadongYin research group of the University of California, Riverside, designed a self-doped tin dioxide (SnO 2 -x) The binary system of nanocrystals and dyes, using the photocatalytic redox reaction to adjust the reversible change of the color of the system, has obtained a rewritable material stimulated by visible light. However, the system changes from colored to colorless under the stimulation of visible light. Difficult to be compatible with existing printing technologies

Method used

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  • Reusable writing material and preparing method thereof
  • Reusable writing material and preparing method thereof
  • Reusable writing material and preparing method thereof

Examples

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preparation example Construction

[0078] The present invention provides a preparation method for the reusable writing material described in the above technical solution, comprising the following steps:

[0079] The color-developing component is coated on the base material as a coating material, or is doped in the base material as a doping material, and is subjected to heat treatment to obtain a reusable writing material.

[0080] In the invention, the color-developing component is coated on the base material as a coating material and heat-treated to obtain a reusable writing material. In the present invention, there is no special limitation on the coating method and the coating amount of the color developing component, and the coating technical scheme of those skilled in the art can be adopted. In the present invention, the heat treatment temperature is preferably 40-100°C, more preferably 50-90°C, most preferably 60-80°C; the heat treatment time is preferably 1-30min, more preferably 3-20min , most preferabl...

Embodiment 1

[0088] With filter paper as the base material, methyl orange, an acid-base indicator, as the acid-changing proton acceptor, and PAH as the light-responsive proton donor, the color-developing component is obtained by mixing PAH and methyl orange at a molar ratio of 8:1. The color-developing component is coated on the filter paper, heat-treated at 80° C. for 2 minutes, and a layer of PET yellow film is covered on the outer layer of the obtained heat-treated material to obtain yellow reusable writing paper.

[0089] The reusable writing paper prepared in this embodiment utilizes a photomask and can be irradiated with blue visible light to obtain red writing (see figure 1 ), in the natural environment, the writing retention time can reach 5h, after heating at 90°C for 5s, the writing can be erased, and after this process is cycled 100 times, from the reflection spectrum, the color shows no bright line attenuation (See figure 2 ), indicating that it has excellent repeatability. ...

Embodiment 2

[0091] Using filter paper as the base material, fluoran leuco dye FH-101 as the acid-changing proton acceptor, and PAH as the light-responsive proton donor, the chromogenic component is obtained by mixing PAH and FH-101 at a molar ratio of 1:1 , after the color component was dissolved in methanol, coated on filter paper, and heat-treated at 90° C. for 1 min to obtain yellow reusable writing paper.

[0092]The reusable writing paper prepared in this example can be written with a visible light laser pen to obtain nearly black handwriting. Under the natural environment, the handwriting can be kept for about 15 minutes. After heating at 80°C for 20s, the handwriting can be erased. After the process cycled 20 times, the color display did not show bright line attenuation.

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Abstract

The invention provides a reusable writing material which comprises a base material and a developing component. The developing component comprises a photoresponse proton donor and an acid meeting colorchanging proton receptor, and the photoresponse proton donor comprises excited state photoinduced acid and / or metastable state photoinduced acid. According to the reusable writing material, the photoresponse proton donor can release protons under irradiation of the visible light, so that the acid meeting color changing proton receptor makes a chemical reaction to cause color changing, and text and pattern displaying is achieved; under the dark or heating condition, the photoresponse proton donor can recapture the protons again, the acid meeting color changing proton receptor return to the original state and color, and text and pattern erasing is achieved. By means of the reusable writing material, quick response for the visible light can be achieved, the contrast ratio of the conditions before and after developing is high, and the repeatability is good; and based on the small destructive effect of the visual light on the developing component, the reusable writing material has the excellent reversibility.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a reusable writing material and a preparation method thereof. Background technique [0002] As we all know, the paper industry is not only the main supporting industry to meet human needs, but also one of the main sources of global environmental pollution and high energy consumption. The ever-increasing human demand for paper is the main root cause of the rapid reduction of global forest coverage, the serious imbalance of the earth's carbon cycle, serious soil erosion and desertification, global warming, climate anomalies, and natural disasters. Most of the daily-used printed materials (such as newspapers, posters, etc.) are discarded after being used once, causing a serious waste of resources. In addition, due to the difficulty in deinking and regeneration of waste paper, serious energy consumption and environmental pollution, frequent replacement of ink cartridges...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L1/00C09K9/02
CPCC09K9/02B43L1/006
Inventor 盛兰张婷张晓安杜贞
Owner JILIN UNIV
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