Water-induced discoloring hidden writing solution and application thereof

A hydrochromic, writing liquid technology, applied in applications, household appliances, inks, etc., can solve the problems of limited color rendering, paper turning red, and easy to be oxidized by light.

Active Publication Date: 2016-08-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited types and displayed coloration of hydrochromic dyes published and reported at present (such as Chinese patent ZL201210575240.5), this greatly limits the application and promotion of reusable water writing paper.
In addition, the previously reported spiro-ring hydrochromic dyes also have the problem of being easily photooxidized, that is, if they are placed under natural light indoors for more than four days or under strong outdoor light for more than one day, the paper will turn red and the handwriting after water shallow

Method used

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  • Water-induced discoloring hidden writing solution and application thereof
  • Water-induced discoloring hidden writing solution and application thereof
  • Water-induced discoloring hidden writing solution and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The preparation of the color developer used as the hydrochromic covert writing liquid of the present invention.

[0071] Taking the color developer C12 as an example, its synthesis is as follows:

[0072] 1) Synthesis of intermediate nitroketo acid

[0073] Mix 2.95g (14.0mmol) 3-nitrophthalic anhydride and 2.50g (15.0mmol) N, N-diethyl-m-aminophenol evenly and add them to a 100mL single-necked bottle, then add 20mL toluene as a solvent , heated to reflux for 7 hours, the reaction was completed, cooled to room temperature to remove toluene under reduced pressure, dissolved with 25mL chloroform and transferred to a 100mL beaker, washed with 20mL (1N) dilute hydrochloric acid and then washed twice with 20mL water, extracted three times with 60mL saturated aqueous sodium carbonate solution, The aqueous phases were combined and acidified with hydrochloric acid to precipitate a pale yellow solid, which was suction filtered and the filter cake was washed with cold water unti...

Embodiment 2

[0077] Preparation of hydrochromic covert writing fluid.

[0078] The color developer, organic solvent, water and binder described in Example 1 are mixed and homogenized at a mass ratio of 0.0001-1:0-200:5-200:1-30 to obtain hydrochromic Covert writing fluid.

[0079] For different chromogenic agents, specific examples are as follows:

[0080] Use C12 as the developer, silane compound as the organic solvent, and polyethylene glycol as the binder: dissolve 20mg of C12 in 50ml of silane coupling agent, dissolve 20g of polyethylene glycol in 200mL of water, mix the two and use After the homogenizer disperses evenly, the hydrochromic covert writing solution is obtained. Dip the obtained hydrochromic recessive writing solution on the paper with a brush. After the water evaporates and dries up, the handwriting will not be visible. When the written position is treated with water, dark green handwriting will appear.

[0081] With C21 as the chromogenic layer and polyethylene glycol...

Embodiment 3

[0087] The hydrochromic invisible writing solution prepared in Example 2 is coated on the paper or board and dried to obtain reusable water writing paper or writing board. Use a brush or pen dipped in water to write on the surface of the above-mentioned reusable water-based writing paper or writing board, or use the above-mentioned water-based writing paper as the printing medium to print with water jets from an inkless printer, and then the writing or pattern can be displayed, and the writing will be displayed after the water evaporates and dries. Disappears, enabling reusability.

[0088] According to the needs of the use environment, one or more of the following performance-enhancing additives can also be added, such as humectants, anti-foaming agents, surfactants, antistatic agents, hardening agents, antistatic agents, antioxidants, preservatives or Leveling agent, etc.

[0089] The hydrochromic invisible writing liquid can also be coated on fibers, such as clothes or fab...

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Abstract

The invention relates to a water-induced discoloring hidden writing solution and application thereof. The water-induced discoloring hidden writing solution is a mixed solution prepared from a developer, an organic solvent, water and an adhesive in a mass ratio of (0.000001-1):(0-20000):(5-20000):(1-3000). The developer is a water-induced discoloring fluorane dye; the organic solvent is one or more of alcohol compounds, ester compounds, ketone compounds, ether compounds, amide compounds, sulfone or sulfoxide compounds and silane compounds; and the adhesive is one or more of polyethyleneglycol, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, cellulose and starch. When the water-induced discoloring hidden writing solution is dipped by a pen for writing and printed on paper by an ink-free printer, the colored writing can appear on the paper, and the writing can disappear after becoming dry; the disappearing writing can reappear when water is used for treating the surface of the disappearing writing, and the writing can disappear again after becoming dry. The water-induced discoloring hidden writing solution has abundant and pure colors, is easy for modification, and has favorable photooxidation resistance.

Description

technical field [0001] The invention relates to a class of hydrochromic covert writing fluid and its application. Background technique [0002] The waste of one-time writing or printing paper is serious. From the perspective of protecting the environment and reusing resources, the recycling of paper is particularly important. Reusable water writing paper based on hydrochromic dyes has attracted much attention due to its environmental protection. [0003] In 2013, Chinese patent ZL 201310405782.2 announced a new type of reusable water-based writing paper, which is based on hydrochromic dyes as color components. The color changes and develops, and after the water dries, the molecular structure of the dye returns to its original state, accompanied by the color fading, thereby realizing the recycling of paper. Because this new type of reusable water writing paper is not only suitable for calligraphy and painting exercises with brushes and daily writing with pens, it can also u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/17C09D11/50
CPCC09D11/17C09D11/50
Inventor 盛兰席冠张晓安张亿杜佳慧李建华
Owner JILIN UNIV
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