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Water writing paper capable of being repeatedly used

A technology of water-based writing paper and color developer, which is applied in the field of water-based writing paper and can solve problems such as limited color types

Active Publication Date: 2016-04-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the types of hydrochromic dyes, the handwriting display color types are limited

Method used

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  • Water writing paper capable of being repeatedly used
  • Water writing paper capable of being repeatedly used

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] With filter paper as the matrix, the acid-base indicator phenolphthalein as the coupler, m-phenylenediamine as the developer, and polyethylene glycol as the binder, the molar mass ratio of the color-developing components phenolphthalein and m-phenylenediamine is 1: 5 are soluble in ethanol, and polyethylene glycol is soluble in water. Mix the ethanol solution of the color-developing component with the aqueous solution of polyethylene glycol in a certain proportion, coat it on the paper base and heat it to get white reusable paper. Water writing paper. The reusable water writing paper has pink handwriting after being dipped in water with a pen or brush, and the handwriting will disappear in 10 minutes under natural environment, and can be reused many times.

Embodiment 2

[0033] With filter paper as the matrix, acid-base indicator thymolphthalein as the coupler, m-phenylenediamine as the developer, polyvinyl alcohol as the binder, and sodium chloride as the humectant, the color components thymolphthalein and m-phenylene Phenylenediamine is dissolved in ethanol at a molar mass ratio of 1:5, hyaluronic acid and polyvinyl alcohol are dissolved in water, and the ethanol solution of the chromogenic component is mixed with the aqueous solution of hyaluronic acid and polyvinyl alcohol in a certain proportion, and the White reusable water writing paper can be obtained by covering on the paper base and heat-treating. The reusable water writing paper is written with a fountain pen or a brush dipped in water or printed with a water jet printer, and the handwriting is blue. Under the natural environment, the handwriting will gradually disappear after 1 hour, and can be reused many times.

Embodiment 3

[0035] With polyester film (PET) as substrate, acid-base indicator bromothymol blue as color coupler, m-phenylenediamine as color developer, gelatin as binder, color components bromothymol blue and m-Phenylenediamine is dissolved in the silane coupling agent KH560 at a molar mass ratio of 1:5, the gelatin is swollen with water and dissolved at 50°C, and the color-developing component solution and the gelatin aqueous solution are rotated at 8000-10000rpm Disperse at high speed, then add the surfactant of 1283, the anti-ultraviolet agent 2-hydroxy-4-n-octyloxybenzophenone and the leveling agent of T-6 to obtain the coating liquid, which is coated on Yellow reusable water writing paper can be obtained through heat treatment on the PET substrate. The reusable water writing paper will appear blue after being printed with a water jet printer, and the writing will disappear in half a minute when heated on a heating platform at 70 degrees, and can be reused many times.

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PUM

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Abstract

The invention relates to a writing printing material capable of being repeatedly used, in particular to water writing paper capable of being repeatedly used, and colors develop when the water writing paper encounters water. The water writing paper is composed of a base body material and a color developing component, wherein the color developing component comprises a color developing agent and a color former. The color developing agent is an organic compound or an inorganic compound, which can be alkaline when encountering water, such as an amine compound, an imine compound, a hydroxylamine compound, an amide compound, a hydrazine compound, a nitrogen heterocyclic ring compound, trinitride and an aluminosilicate inorganic polymer. The color former is an acid-base indicator which can generate a chemical reaction under the alkaline condition so as to change the color obviously; when water is removed, the color developing agent and the color former can reversibly restore to the states before reactions, and with the color restores to the initial color, repeated utilization can be achieved. The color developing speed is high, the contrast before and after color developing is high, and different colors can develop with adoption of different color formers.

Description

technical field [0001] The invention relates to a reusable writing and printing material, in particular to a reusable water writing paper which develops color when exposed to water. Background technique [0002] Traditional writing or printing paper is disposable, and the written or printed handwriting cannot be erased, and it is discarded after use. This not only brings about a huge waste of resources, but also causes serious pollution to our environment. From the perspective of protecting the environment and reusing resources, the recycling of paper is particularly important. Water-based writing paper has attracted much attention because it uses water instead of ink to write or print, and the handwriting disappears after the water dries, which can realize the reuse of paper and is in line with the sustainable development strategy of human beings. [0003] There are also a large number of reusable water-colored water writing papers on the market at present, but the existin...

Claims

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Application Information

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IPC IPC(8): B41M5/50B43L1/00D21H27/00
CPCB41M5/50B43L1/10D21H27/00
Inventor 张晓安席冠盛兰陈俏男李建华张婷
Owner JILIN UNIV
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