UV photochromic reusable paper

A technology of ultraviolet light and color change, applied in paper, papermaking, special paper, etc., can solve the problems of low resolution, poor handwriting clarity, high cost, etc., and achieve the effect of clear printed handwriting, slow handwriting fading, and low cost of use

Active Publication Date: 2017-10-27
李冠纯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has the following problems: 1. The minimum printing size is 5, and fine printing cannot be achieved
2. The production cost of paper is high and it is difficult to popularize
3. It has high requirements on the use environment, and mistakes are prone to occur in the use process
But this technology has the following problems: 1, multi-layer paper, high cost
2. It is difficult to print fine text and pictures many times
3. There is pollution in the preparation process of chemical dyes
4. The printing speed is slower than traditional printers
But this technology has the following problems: 1. The writing clarity is poor, the resolution is low, and the printing speed is slow
2. The printer will have dot matrix printer noise, and the number of cycles is small
But this technology has the following problems: 1. The quality of printing i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The ultraviolet photochromic reusable paper of the present invention is made by compounding ultraviolet photochromic reversible material and paper, and the specific preparation method is as follows:

[0047] Under dark conditions, the mass is m 1 The M powder is dissolved in a volume of L 1 In deionized water, prepare the M solution with a certain mass percentage concentration; take the mass as m 2 P dissolved in a volume of L 2 Prepare a P solution with a certain mass percentage concentration in deionized water; slowly drop the P solution into the M solution at 50-80° under stirring conditions; after reacting for 1 hour under stirring conditions, cool the solution to room temperature to obtain a transparent compound solution; soak paper in clear compound solution and allow to dry.

[0048] The mass percent concentration of the M and P complexes in the transparent complex solution is above 2%.

[0049] See Table 1 for reagent dosage.

[0050] Table I

[0051]

...

Embodiment 2

[0057] The data show that among the many properties of polyacid compounds, one of the most remarkable properties is that it can form a donor-acceptor charge transfer compound with many organic compounds containing active groups such as hydroxyl and amine groups. This kind of compound changes from colorless to blue under ultraviolet light irradiation, and the reduced species can still return to the original color when placed in a dark place in the presence of oxygen, and this coloring-fading process can be repeated many times.

[0058] Such as figure 1 It can be seen that the excitation wavelengths of the photochromic composite films of the four formulation systems are significantly different. For the same polymer system, the excitation wavelengths of the phosphomolybdic acid system are higher than those of the phosphotungstic acid system. But for the same polyacid system, the excitation wavelength of P1 is slightly lower than that of P2 system. Generally speaking, the excitat...

Embodiment 3

[0060] figure 2 It is a TEM photo of PMoA / PEG / SAL (phosphomolybdic acid / polyethylene glycol / styrene-acrylic emulsion) composite film. In the photo, phosphomolybdic acid shows a spherical surface morphology. In the polyethylene glycol organic substrate added with styrene-acrylic emulsion as a membrane aid, phosphomolybdic acid is uniformly dispersed in the polymer matrix with small-sized nanoparticles of 50nm.

[0061] Figure 3a It is the AFM picture of the polyvinyl alcohol (PVA) polymer film before compounding. It can be seen from the picture that the surface of the pure phase PVA film shows a relatively regular peak-shaped structure. After adding the heteropoly acid, the surface of PVA was covered by many spherical complexes with a size of about 100 nm dispersedly arranged ( Figure 3b ). This result reflects that there is a strong interaction between the heteropoly acid and the polymer substrate, which destroys the original arrangement of the polymer, resulting in a ch...

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Abstract

The invention relates to an ultraviolet photochromic reusable paper, which is made of a composite of ultraviolet photoreversible discoloration material and paper; the ultraviolet photoreversible discoloration material is composed of polyacrylamide or polyvinyl alcohol and Composed of polyacid compounds, and polyacid compounds and polyacrylamide constitute a donor-acceptor charge transfer compound, the ratio of polyacid compounds to polyacrylamide is 10-2:1; the polyacid compound is Keggin structure At least one of phosphotungstic acid and Keggin structure phosphomolybdic acid. The paper can quickly change from colorless to blue-black, black or pure blue under ultraviolet light irradiation, does not change color under natural light or no light, and can still return to the original color after being placed in the presence of oxygen for 6 to 30 hours. And this coloring-fading process can be repeated many times, the present invention is low in use cost, degradable and recyclable, has high printing fineness, and can be used as writing or printing paper.

Description

technical field [0001] The invention belongs to the technical field of paper development and relates to an ultraviolet photochromic reusable paper. Background technique [0002] Papermaking is one of the greatest inventions affecting the development of world civilization. As the carrier of characters and culture, paper brings great convenience to people's work and study, makes the spread of culture more convenient, and promotes the development of human civilization. [0003] The traditional paper industry consumes a lot of energy, causes serious pollution, and wastes paper in daily use. According to relevant survey data, about 45% of printed or copied paper documents are "disposable". Extremely low, the waste of paper is shocking, and reducing paper consumption by changing people's habits has not been effective in the short term. How to make paper reusable? Many research institutions and enterprises at home and abroad have conducted research, but there are problems such a...

Claims

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Application Information

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IPC IPC(8): D21H27/00D21H21/14D21H17/36
Inventor 李冠纯
Owner 李冠纯
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