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Polyacid based erasable paper and preparation method therefor

An acid solution, polyethylene glycol technology, used in papermaking, paper coatings, textiles and papermaking, etc., can solve the problems of unstable, expensive, and short color retention time in the color changing process of rewritable paper

Active Publication Date: 2015-11-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a polyacid-based erasable paper and its preparation in order to solve the technical problems that the existing erasable paper is unstable during the discoloration process, the color retention time is short, the material is toxic and the price is expensive. method

Method used

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preparation example Construction

[0025] The present invention firstly provides a kind of preparation method based on polyacid rewritable paper, comprising:

[0026] Step 1: Mix the polyacid solution with the alcohol solution to obtain a mixed solution, add the mixed solution into a quartz cell, and irradiate the mixed solution with a high-pressure mercury lamp to obtain a reduced polyacid solution;

[0027] Step 2: Add polyethylene glycol to the reduced polyacid solution obtained in step 1 to obtain the reduced polyacid solution of polyethylene glycol, and smear the polyethylene glycol solution, polyethylene glycol reduced polyacid solution on the cellulose filter paper successively. Prototype polyacid solution and polyethylene glycol solution, and drying at 40-90°C respectively to obtain polyacid-based rewritable paper.

[0028] According to the present invention, the polyacid solution is mixed with the alcohol solution to obtain a mixed solution, the mixed solution is added in a quartz cell, and the mixed s...

Embodiment 1

[0037] Mix 10mM silicomomolybdic acid solution and isopropanol aqueous solution at a volume ratio of 1:4, add it to a 1cm quartz cell, and irradiate it under a high-pressure mercury lamp (emission light 365nm, power 10-1000W) until the color of the solution turns dark blue , to obtain the reduced polyacid;

[0038] Polyethylene glycol 2000 was added to the obtained reduced polyacid solution to obtain a 5% polyethylene glycol 2000 reduced polyacid solution, which was evenly spread on cellulose filter paper with a mass fraction of 10%. Ethylene glycol 20000 solution, and dry at 70 for 1 hour, so that the surface of the cellulose paper is uniformly covered with a layer of PEG film; then, 5% polyethylene glycol 20000 reduced polyacid solution is evenly spread on the cellulose paper surface, and dried at 70°C for 1 hour; finally, a layer of 10% polyethylene glycol 20,000 solution was uniformly applied on the surface of the above-mentioned paper as a protective layer, and dried at 7...

Embodiment 2

[0044] Mix 1mM phosphomolybdic acid solution and methanol aqueous solution at a volume ratio of 1:2, add it to a 1cm quartz cell, and irradiate it under a high-pressure mercury lamp (emitted light 365nm, power 10-1000W) until the color of the solution turns dark blue, that is get reduced polyacid;

[0045] Polyethylene glycol 2000 is added in the reduced polyacid solution that obtains, and the polyethylene glycol 2000 reduced polyacid solution that obtains mass fraction is 2%, smears mass fraction evenly on the cellulose filter paper and is 5% polyacid solution. Ethylene glycol 20,000 solution, and dried at 40°C for 3 hours, so that the surface of the cellulose paper is evenly covered with a layer of PEG film; then, the mass fraction of 2% polyethylene glycol 20,000 reduced polyacid solution is evenly spread on the fiber Plain paper surface, and dry at 40°C for 3 hours; finally, apply a layer of 5% polyethylene glycol 20,000 solution evenly on the surface of the paper obtained...

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Abstract

The invention provides polyacid based erasable paper and a preparation method therefor and belongs to the technical field of erasable paper. The polyacid based erasable paper is used for solving the technical problems of the existing erasable paper that the existing erasable paper is unstable during discoloration, the color retention time is short, materials are toxic and the price is expensive. The method comprises the steps: mixing a polyacid solution and an alcoholic solution so as to obtain a mixed solution, adding the mixed solution into a quartz tank, and irradiating the mixed solution with a high-voltage mercury lamp so as to obtain a reducing type polyacid solution; and then, adding polyethylene glycol into the reducing type polyacid solution so as to obtain a polyethylene glycol reducing type polyacid solution, smearing cellulose filter paper with a polyethylene glycol solution, the polyethylene glycol reducing type polyacid solution and the polyethylene glycol solution sequentially, and carrying out drying respectively at the temperature of 40-90 DEG C, thereby obtaining the polyacid based erasable paper. The invention also provides the polyacid based erasable paper. Chinese characters, letters and digits obtained through writing and printing the erasable paper provided by the invention are clear and can be kept to be free of obvious change for at least three months.

Description

technical field [0001] The invention belongs to the technical field of rewritable paper, and in particular relates to a polyacid-based rewritable paper and a preparation method thereof. Background technique [0002] In the process of daily communication, information transmission and storage, paper plays a very critical role. Despite today's growing popularity of electronic media, world paper consumption has tripled in the past three decades to 400 million tons per year. Unfortunately, most of the paper is only used once before being discarded, and the wasted paper and printing inks cause many environmental problems, such as forest destruction, large amounts of solid waste and chemical pollution. Erasable paper that can be reused is considered to solve the economic and environmental problems caused by the waste of paper and ink. At present, switchable organic dyes are often used to construct rewritable paper. Based on this, light-responsive, pH-responsive, humidity-responsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14D21H19/20D21H19/82
Inventor 曲晓刚孙瀚君
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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