CN104818653B - The ultraviolet light induced reusable paper of discoloration - Google Patents
The ultraviolet light induced reusable paper of discoloration Download PDFInfo
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Abstract
The present invention relates to the ultraviolet light induced reusable paper of discoloration of one kind, the paper is made by ultraviolet light induced reversible color material and paper are compound；The ultraviolet light induced reversible color material is by polyacrylamide or polyvinyl alcohol and many acids compound groups into and many acid compounds constitute Donor acceptor charge transfer compound with polyacrylamide, and the ratio of many acid compounds and polyacrylamide is 10~2:1；Wherein many acid compounds are at least one of structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid.The paper quickly can be changed into blue-black, black or pure blue in ultraviolet light from colourless, the nondiscolouring under natural lighting or no light, original color can be still arrived after placing 6~30 hours in the presence of oxygen again, and this coloring colour fading process can be repeatedly, use cost of the present invention is low, degradable and recycles, print fineness height, can be used as writing or print paper.
Description
Technical field
The invention belongs to paper Development Techniques field, it is related to a kind of ultraviolet light induced reusable paper of discoloration.
Background technology
Papermaking technology is to influence one of most great invention of development of world civilization, and paper gives people as word, cultural carrier
Work, study bring great convenience, make culture propagation more facilitate, promote the development of human civilization.
Traditional paper-making industry energy consumption is huge, seriously polluted, and the routine use of paper wastes serious.It is aobvious according to relevant survey data
Show, in the paper document through printing or duplicating, 45% or so is " disposable ", as long as the RT of some files is short several
Minute, wastepaper basket is just sent to after reading once, utilization rate is extremely low, and the waste of paper makes people startling, by changing people
Custom could not take effect in short term to reduce paper consumption.Paper how is allowed to reuseLot of domestic and international research institution and enterprise
Industry all once carried out research, but have that use cost is high, thoroughly scrap after paper difficult degradation and recycling, manufacturing process
Energy consumption is big and prints the low problem of fineness, does not obtain extensive popularization and application.
Paper is reused to be developed extensively, it is below that technological overview is as follows：
Chemical College, Jilin Univ. develops " the inkless printing of water spray " technology for 2014, and its correlative study achievement is in Britain
《It is natural》The communication network periodical of magazine《Naturally communicate》On deliver, and cause overseas numerous colleagues, expert to pay high attention to.This
The core of technology is printing paper, can realize that paper recovers colourless after 22 hours at present.Principle is that water is caused into chromotropic dye
It is carried on paper substrate, color is shown when paper runs into water, when water volatilization is dry, paper returns to no color state again, so as to realize
Reuse.But there are the following problems for the technology：1st, No. 5 words of minimum printing, it is impossible to realize fine printing.2nd, paper production cost
It is high, it is difficult to promote.3rd, high is required to use environment, is easily made a fault using process.
The technology that Japanese letterpress company releases.This paper can be erased in printing after word or picture, and can be again
Secondary printing new word or picture, such Reusability is up to more than 500 times.This paper is colourless at normal temperatures, and there is light on surface
Pool, it is more thick than general paper.Paper can be heated to 180 degrees Celsius by the warmer that printer is especially equipped with moment --- so
At a high temperature of, the dyestuff in the recording layer of paper is just combined with pigment catalyst shows color and luster.But the technology exists as follows
Problem：1st, multi-ply paper, cost is high.2nd, it is difficult to repeatedly print fine word and picture.3rd, there is dirt using chemical dye preparation process
Dye.4th, print speed is slow compared with conventional printer.
Chemical and Molecular Engineering College of Beijing Univ. develops under pressure off-color material and is manufactured into reuse paper, this
Paper is more thick than general paper.The controllable micro pressure head of printer, which taps paper, can leave writing, can be disappeared again after processing
Printing.But there are the following problems for the technology：1st, writing poor definition resolution ratio is low, and print speed is slow.2nd, printer has pin type
Printer noise, and cycle-index is few.
The ecological printer (Eco Printer) of Taiwan Guang Bao groups design, is especially suitable for needing often printing rough draft
Place, a piece of paper is reused, cost-effective and environmental protection.A kind of ink to ultraviolet-sensitive is equipped with, can be as common
Ink is used and printed like that, it is necessary to when recovery, printing paper is placed under uviol lamp and irradiated, ink " will disappear ".But
There are the following problems for the technology：1st, it is of poor quality when printing is with previous lap.2nd, repeat with special equipment is needed, the cycle is long.3、
Current ink is expensive.
Develop within 2011 a kind of liquid crystal paper (e-Paper) in Taiwan industrial technology research institute.This liquid crystal paper uses temperature-sensitive
Type printer is manufactured with cholesterol liquid crystal, can be repeatedly used.But there are the following problems for the technology：1st, cost is high, one
About 14 yuans or so of A4 paper cost.2nd, reclaim difficult, not environmentally
Toshiba Corp 2013 year releases a repeatable erasable multi-function printer and list marketing for 2 months.It makes
A kind of special carbon dust is manufactured with the microcapsules encapsulation technology of temperature-sensitive colouring agent, in normal temperature in normal color, but high temperature
Heating can make word and pattern fade, and become the repeatable new paper utilized.But there are the following problems for the technology：1st, printer into
This height.2nd, rear ink powder superposition, which is used for multiple times, declines print quality.3rd, at most repeat 5-8 times.4th, consumables cost is high.
Reuse paper is developed in 2014 in California, USA university streamside branch school, can ensure that definition, contrast are constant
In the case of repeat erasable 20 times.Currently make great efforts to improve the erasable number of times of material and apply scale.By laminated plastics and glass
Glass is constituted, and surface scribbles photoactive material, under ultraviolet irradiation, and oxidation ink can be arrived material surface by " print ", and then produce
New word mark；And a period of time in the environment of dropping it off 115 DEG C, writing just all disappearances.But still there are the following problems：1st, mould
Material and glass are made, and non-degradable hardly possible is reclaimed.2nd, cost is high, and energy consumption is big.3rd, sheet-fed thickness is big, and " paper " is partially hard, is not suitable for
Printing.4th, the color of " paper " is blueness.There is presently no develop workable Method of printing, it is necessary to by the mode of photocopy simultaneously
Realize printing.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of use cost it is low, degradable and recycle, printing it is fine
The high reusable paper of ultraviolet light induced discoloration of degree.
In order to solve the above-mentioned technical problem, the reusable paper of ultraviolet light induced discoloration of the invention uses following two kinds of technologies
Scheme.
Technical scheme one：
The reusable paper of ultraviolet light induced discoloration of the present invention is made by ultraviolet light induced reversible color material and paper are compound；
The ultraviolet light induced reversible color material is by polyacrylamide and many acids compound groups into and many acid compounds and polypropylene
Acid amides constitutes donor-receiver charge transfer compound, and the ratio of many acid compounds and polyacrylamide is 10~2:1；Wherein
Many acid compounds are at least one of structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid.
The ultraviolet light induced reusable paper of discoloration is shone after shining 5~200ms through wavelength for 300~405nm light sources are auxiliary
Penetrate partially change into place 6~30 hours naturally in blue-black, black or pure blue, air after fade completely.
The above-mentioned ultraviolet light induced reusable paper of discoloration can be prepared using following methods：
By the dissolving of the Polyacrylamide Powder of certain mass in deionized water or ethanol, it is configured to certain mass percent
The polyacrylamide solution of concentration；Take a certain amount of many acid compounds to be dissolved in deionized water or ethanol, be configured to certain
Many acids compound solutions of mass percent concentration；It is in 50~80 ° that many acids compound solutions are slow under agitation
Instill polyacrylamide solution；React after more than 1h, solution is cooled to room temperature, transparent composite solution is obtained；Paper is used
Dried after transparent composite solution immersion.
The light source is 200~405nm laser, and its power is 50~200mW.
Wherein Polyacrylamide Powder is pure to analyze, and structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid are through secondary
Obtained after recrystallization purification.
The ultraviolet light induced reversible color material, which can also be mixed into paper pulp to be directly prepared into ultraviolet light induced discoloration and repeat, to be made
Use paper.
Technical scheme two：
The reusable paper of ultraviolet light induced discoloration of the present invention is made by ultraviolet light induced reversible color material and paper are compound；
The ultraviolet light induced reversible color material is polyvinyl alcohol and many acids compound groups into and many acid compounds and polyvinyl alcohol
Donor-receiver charge transfer compound is constituted, the ratio of many acid compounds and polyvinyl alcohol is 10~2:1；Wherein many acids
Compound is at least one of structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid.
The ultraviolet light induced reusable paper of discoloration is that the auxiliary 5~200ms that shines of 200-405nm light sources is changed into blue through wavelength
Black, black or pure blue, fade completely after placing 6-30 hours naturally.
The above-mentioned ultraviolet light induced reusable Preparation Method made of paper of discoloration is as follows：
The pva powder of certain mass is dissolved in deionized water or ethanol, certain mass percent is configured to dense
The poly-vinyl alcohol solution of degree；Take a certain amount of many acid compounds to be dissolved in deionized water or ethanol, be configured to certain mass
Many acids compound solutions of percent concentration；Many acids compound solutions are slowly dropped into 50~80 ° under agitation
Poly-vinyl alcohol solution；React after more than 1h, solution is cooled to room temperature, transparent composite solution is obtained；By paper with transparent multiple
Dried after polymer solution immersion.
The light source is 200~405nm laser, and its power is 30-200mW.
Wherein Polyacrylamide Powder is pure to analyze, and structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid are through secondary
Obtained after recrystallization purification.
The ultraviolet light induced reversible color material, which can also be mixed into paper pulp to be directly prepared into ultraviolet light induced discoloration and repeat, to be made
Use paper.
The present invention using the organic compound of many acid compounds and hydroxyl, amido isoreactivity group constitute donor-by
The property of the ultraviolet light induced reversible color material of electric charge transfer of body, the ultraviolet light induced reversible color material and paper are combined and are made
Reusable paper.Reusable paper quickly can be changed into blue-black, black or pure blue in ultraviolet light from colourless, certainly
Nondiscolouring under right illumination or no light, original color can be still arrived again after placing 6~30 hours in the presence of oxygen, and this
Coloring-colour fading process can be repeatedly.
Found in experimentation, laser power crosses conference scaling loss paper, cause irreversible impression, but the too small change of power
Color is not obvious.By control experiment repeatedly, it is clear to determine to realize character pattern when laser output power is between 50-150mW
Easily differentiate, and without impression during paper recycling.
The present invention is write or printed using UV light-induced color changing method, without consuming carbon dust or ink, is reused super
The printing writing effect for remaining to keep good after 10 times is crossed, use cost is low；Degradable and recycling after paper is discarded；Printing
Change colour during writing fast, writing fades slow；Printing writing is clear, high resolution, and writing minimum feature is amplified for 0.05mm part
It is still clear afterwards to differentiate, and data is shown, in place of the standard distance of distinct vision (25cm), the resolution distance of normal eye is 0.073mm；
Ultraviolet light induced reversible color material non-toxic is harmless.The present invention can be used as writing or print paper, to substitute traditional paper.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the relation schematic diagram of ultraviolet light induced reversible color material prescription system and excitation wavelength.
Fig. 2 is the TEM photos of PMoA/PEG/SAL (phosphomolybdic acid/polyethylene glycol/styrene-acrylic emulsion) composite membrane.
Fig. 3 a, 3b, 3c are pure phase PVA (polyvinyl alcohol) film, the laminated film added after heteropoly acid respectively, after illumination
Laminated film surface topography AFM figure.
Fig. 4 a, 4b, 4c be respectively pure PVA film, 0.002M PWA/PVA (phosphotungstic acid/polyvinyl alcohol) composite membrane illumination before,
AFM photos after 0.002M PWA/PVA (phosphotungstic acid/polyvinyl alcohol) composite membrane illumination.
Fig. 5 a, 5b are phosphotungstic acid/polyacrylamide (abbreviation PWP) and phosphomolybdic acid/polyacrylamide (abbreviation PMoP) respectively
Composite membrane with ultraviolet lighting time change coloring uv-visible absorption spectra.
Fig. 6 is absorption peak strength change curve of the two kinds of composite membranes of PWP, PMoP with light application time.
Fig. 7 a, 7b are respectively the PWA/PVA composite membrane light under the coloring and same molar ratio of PMoA/PVA laminated films
Cause discoloration curve map.
Fig. 8 for same molar ratio (0.002M) PWA/PVA, PMoA/PVA composite membrane at 735nm absorption peak strength
With the comparison diagram of ultraviolet lighting time change.
Fig. 9 a, 9b are the UV-visible spectrum of PWP composite membranes and PMoP colour fading processes respectively.
Figure 10 a, 10b are the blue laminated films of 0.002M PMOA/PVA and the blue THIN COMPOSITEs of 0.002M PWA/PVA respectively
Film colour killing process schematic.
Figure 11 a, 11b are PWA/PVA composite membranes, the discoloration of PMoA/PVA composite membranes, colour fading circulation experiment situation respectively.
Embodiment
Embodiment 1
The reusable paper of ultraviolet light induced discoloration of the present invention is made by ultraviolet light induced reversible color material and paper are compound,
Specific preparation method is as follows：
It is m by quality under the conditions of lucifuge1M powder be dissolved in volume for L1In deionized water, certain mass is configured to
The M solution of percent concentration；It is m to take quality2P be dissolved in volume for L2In deionized water, certain mass percent is configured to dense
The P solution of degree；P solution is slowly dropped into M solution in 50~80 ° under agitation；, will after being reacted 1 hour under stirring condition
Solution is cooled to room temperature, obtains transparent composite solution；Dried after paper transparent composite solution is soaked.
The mass percentage concentration of M and P compounds is more than 2% in the transparent composite solution.
Reagent dosage is shown in Table one.
Table one
Note：In table one, P1 is polyacrylamide, and P2 is polyvinyl alcohol, M1, M2 be respectively structure with Keggin phosphotungstic acid and
Structure with Keggin phosphomolybdic acid.Wherein Polyacrylamide Powder is analysis pure, structure with Keggin phosphotungstic acid and structure with Keggin phosphorus molybdenum
Acid is obtained after being purified through secondary recrystallization.
The ratio optimum value of wherein many acid compounds and polyacrylamide (or polyvinyl alcohol) is 4:1.
The ultraviolet light induced reusable paper of discoloration is shone after shining 5~200ms through wavelength for 300~405nm light sources are auxiliary
Penetrate partially change into place 6~30 hours naturally in blue-black, black or pure blue, air after fade completely.
Embodiment 2
Data is shown, in many property of many acid compounds, and one of its property the most significant is that it can be with crowd
Many hydroxyls, the organic compound of amido isoreactivity group constitute the charge transfer compound of donor-receiver.Such compound exists
It is changed into blueness from colourless under ultraviolet light, dark place placement can still return to original color to reduction species in the presence of oxygen,
And this coloring-colour fading process can be repeatedly.
As shown in figure 1, the light excitation wavelength of the Photochromic of four kinds of formula systems exist it is significantly different, for
For Polymer Systems of the same race, the excitation wavelength of phosphomolybdic acid system is above phosphotungstic acid system.And for many acid systems of the same race
For, P1 excitation wavelength is slightly less than P2 systems.In general, the excitation wavelength of the four classes formula system is in purple
In outside-visible excitation wavelength range.
Embodiment 3
Fig. 2 is the TEM photos of PMoA/PEG/SAL (phosphomolybdic acid/polyethylene glycol/styrene-acrylic emulsion) composite membrane.Phosphorus molybdenum in photo
Acid shows spherical surface pattern, is to help in the polyethylene glycol organic substrates of film with the addition of styrene-acrylic emulsion, phosphomolybdic acid with
50nm small size nano particles are evenly dispersed in polymer matrix.
Fig. 3 a scheme for the AFM of polyvinyl alcohol (PVA) polymeric membrane before being combined, as seen from the figure pure phase PVA film table
Face shows the peak shape structure of comparison rule.Add after heteropoly acid, PVA surfaces are left by the size of numerous dispersed arrangements about 100nm
Right globular complex covering (Fig. 3 b).This result reflects due to there is strong phase interaction between heteropoly acid and macromolecule substrate
With, so as to destroy the original arrangement mode of macromolecule, cause it is compound before and after pattern change.Laminated film surface after illumination
There are significant changes in pattern, and globular complex generates aggregation (Fig. 3 c).
Change for the pattern that compares composite film surface, we illustrate pure PVA film and 0.002M PWA/PVA (phosphotungstic acid/
Polyvinyl alcohol) AFM photos such as Fig. 4 a, 4b, 4c before and after composite membrane illumination.From the figure, it can be seen that pure PVA film show it is regular
Crest surface, size and pattern are more homogeneous.After PVA (polyvinyl alcohol) and PWA (phosphotungstic acid) is compound, the surface peak shape of film becomes
It is blunt, become hills shape from sharp mountain peak shape.This is probably PWA particles and high score after being dispersed to due to PWA particles in PVA
Caused by generating strong interaction between sub- substrate.Composite membrane is after ultraviolet light, and the size of the particle of compound is from 30
~40nm, which becomes, turns to 50~60nm, and the accumulation degree of composite inorganic membranes also significantly strengthens.
It can consider that off-color material exists and and base with nanoscale micronized form after composite preparation by above-mentioned experiment
Bottom continuous film forming, can be uniformly distributed in paper surface, change colour using particulate as unit, it is ensured that accurate word in print procedure from now on
The resolution ratio of image.
Embodiment 4
Change colour response intensity experiment
Fig. 5 a, 5b are phosphotungstic acid/polyacrylamide (abbreviation PWP) and phosphomolybdic acid/polyacrylamide (abbreviation PMoP) respectively
Composite membrane with ultraviolet lighting time change coloring uv-visible absorption spectra.Two kinds of films without illumination 350~
Do not occur obvious absworption peak in 1100nm wave-length coverages.PWP films after ultraviolet light occur with one in visual field
Two wide absworption peaks of individual acromion (at 490nm), respectively positioned at 802 and 625nm.And PMoP films occur one only at 721nm
Individual wide characteristic absorption peak, and be blue shifted to the extension of light application time at 709nm.In blue PMoP Thin Films UV-vis
Acromion at 490nm is not observed in spectrum, because the d-d transition of molybdenum system heteropoly blue is covered by IVCT transition sometimes.
The appearance of IVCT transition demonstrates phosphotungstic acid and phosphomolybdic acid under the irradiation of ultraviolet light and there occurs light also in two kinds of composite membranes
Original reaction, generates heteropoly blue.
Upper two kinds of composite membranes of figure are as shown in Figure 6 with the absorption peak strength change curve of light application time.As seen from the figure, PMoP films
With very strong photochromic response power.PMoP films after the illumination 70min absorption peak strength at 720nm, which becomes, turns to 0.546, and
It is only 0.251 absorption peak strength changes at 626nm with the PWP films under PMoP film the same terms.Therefore, PMoP films are identical
Absorption intensity change under shooting condition is higher than about 2.17 times of PWP films.
PWA/PVA under our existing colorings and discoloration and same molar ratio by above-mentioned PMoA/PVA laminated films
The photochromic situation of composite membrane is compared, and finds the light-induced variable to laminated film with mutually isostructural heteropoly acid not of the same race
Color performance, which has, significantly to be influenceed (as shown in 7a, 7b).Fig. 8 is multiple for PWA/PVA, PMoA/PVA of same molar ratio (0.002M)
Close film at 735nm absorption peak strength with ultraviolet lighting time change comparison diagram.As seen from Figure 8, with the ultraviolet lighting time
Extension, absorption peak strength of the PMoA/PVA composite membranes at 735nm increase quickly, and 0.347 saturation is just reached in 5min
Value, is 1.74 times of now (0.199) of the absorption peak strength of PWA/PVA composite membranes.PWA/PVA composite membrane absorption peak strengths exist
Saturation is reached after 8min.Compared with PWA/PVA composite membranes, PMoA/PVA composite membranes show faster speed of photoresponse and high
Photochromic efficiency.
Embodiment 5
Fade and test
Fig. 9 a, 9b give the ultraviolet-visible spectrum of two kinds of composite membrane colour fading processes.It is multiple after ultraviolet light is stopped
Film is closed to start gradually to fade in atmosphere.Compare Fig. 9 a and 9b it can be found that the fading rate of PWP films will be faster than PMoP films.PWP
Film completed colour fading process in 30 days, and the absorption intensity that PMoP films are reached when fading 30 days (at 720nm)
5/6ths still for coloring saturated absorption intensity.
As shown in Figure 10 a, 10b, stop after ultraviolet lighting, by the blue laminated films of 0.002M PMOA/PVA and 0.002M
PWA/PVA bluenesss laminated film in atmosphere and at room temperature place by dark place, blue gradually fading.And blue membrane is empty in isolation
Gas or in nitrogen environment room temperature dark place for a long time place it is colour-fast, illustrate that oxygen is served during colour killing by W5+It is oxidized to
W6+Effect.During 0.002M PWA/PVA laminated film colour killings (as shown in fig. lob), early stage of the blue membrane in colour killing
Fading rate is very fast, and absorption peak strength at 700nm is located at after 6h just reduces 50%.With the extension of fading time, colour killing
Journey gradually slows down, until it is complete to be faded after 72h.
Embodiment 6
Add lustre to-fade circulation experiment
Figure 11 a are the natural colour killings, then colour in atmosphere by after PWA/PVA composite membrane ultraviolet lighting saturations, then are disappeared
Color, is so repeatedly available coloring-colour fading circulation figure of composite membrane.As seen from the figure, with the increase of illumination number of times, corresponding coloring
Saturation absorbance is gradually reduced.Illustrate that the photochromic invertibity of the composite membrane is poor.The result of infrared spectrum display that with
The increase of color-colour fading cycle-index, the interaction between PWA and PVA gradually weakens, so as to reduce the light-induced variable of laminated film
Colour efficiency, result in the relatively low fatigue resistance of laminated film.
Figure 11 b are the natural colour killings, then colour in atmosphere by the PMoP composite membranes after ultraviolet lighting saturation, then colour killing, such as
This is repeatedly available coloring-colour killing circulation figure of PMoP composite membranes.As seen from the figure, composite membrane has well photochromic reversible
Property.Due between the absorbance and original state after first time colour killing and second colour saturation absorbance and initial coloring it is full
There is little difference between absorbance, illustrated in transfer process between the two states at film performance good weight
Renaturation.
Embodiment 7
Poison and tested with contamination analysis
Labelled respectively on fish jar, be respectively put into the water 4000ml by sufficient standing, ultraviolet light induced by the present invention can
Inverse off-color material 100ml is dissolved in water, selects a fish jar else as control, insoluble filmogen.Again 10 are respectively put into each fish jar
Bar health, the size of the same race goldfish close with body weight, timing is fed and record case, after observing 2 days, finds filmogen not
Have an impact normal existence and the growth of fish (100ml filmogens can about prepare 60-80 A4 size UVPRP).
Because galvanometer scanning system has been used widely in laser marking industry, control system is not required to special exploitation,
But to adapt to the optical maser wavelength that the present invention is selected, marking machine scanner (surface coating material needed for reflection different wavelengths of light need to be changed
It is different), special customized galvanometer can be made into suitable for ultraviolet light mutagens of the present invention to being installed to transformation on original marking machine
The device of the reusable paper printing of color.The control system of laser marking can use NPD projects Changchun, Changchun NPD projects photoelectricity skill
The control card and laser marking machine control software of art Co., Ltd exploitation can meet printing as experiment software and require.After printing
Visually with conventional printer printing effect without significant difference, writing is clear, and high resolution does not have the phenomenons such as ghost image, towing.
To examine the recycling number of times of the ultraviolet light induced reusable paper of discoloration of the present invention, paper is being prepared with laser pen
On write, paper is accelerated to fade after (being put into 100 DEG C of baking ovens) and write and faded repeatedly the experiment write in same position again.
It is demonstrated experimentally that：Reusable at least 10 times of paper.Experiment shows, is being heated in the case of 100 DEG C, former fading time 9 hours
Paper can be faded completely in 30 minutes, and do not influence recycle.
Claims (4)
1. a kind of ultraviolet light induced reusable paper of discoloration, it is characterised in that be combined by ultraviolet light induced reversible color material with paper
It is made；The ultraviolet light induced reversible color material by polyacrylamide and many acids compound groups into, and many acid compounds with
Polyacrylamide constitutes donor-receiver charge transfer compound, and the ratio of many acid compounds and polyacrylamide is 10~2:
1；Wherein many acid compounds are at least one of structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid；The reuse
Paper is that 300~405nm light sources are auxiliary through wavelength to be partially changed into blue-black, black or pure blue, air according to illuminated after 5~200ms
Naturally faded completely after placing 6~30 hours；The light source is 200~405nm laser, and its power is 50~150mW.
2. the reusable paper of ultraviolet light induced discoloration according to claim 1, it is characterised in that the Polyacrylamide Powder
Pure to analyze, structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid are obtained after being purified through secondary recrystallization.
3. a kind of ultraviolet light induced reusable paper of discoloration, it is characterised in that be combined by ultraviolet light induced reversible color material with paper
It is made；The ultraviolet light induced reversible color material be polyvinyl alcohol and many acids compound groups into, and many acid compounds with it is poly-
Vinyl alcohol constitutes donor-receiver charge transfer compound, and the ratio of many acid compounds and polyvinyl alcohol is 10~2:1；Wherein
Many acid compounds are at least one of structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid；The ultraviolet light induced discoloration
Reusable paper is that the auxiliary 5~200ms that shines of 200-405nm light sources is changed into blue-black, black or pure blue through wavelength, and 6- is placed naturally
Faded completely after 30 hours；The light source is 200~405nm laser, and its power is 50-150mW.
4. the ultraviolet light induced reusable paper of discoloration according to claim 3, it is characterised in that the polyacrylamide powder
End is pure to analyze, and structure with Keggin phosphotungstic acid and structure with Keggin phosphomolybdic acid are obtained after being purified through secondary recrystallization.
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| CN109823090A (en) * | 2019-03-20 | 2019-05-31 | 深圳大学 | It is a kind of to be set with based on photochromic erasable written record |
| CN110591687B (en) * | 2019-08-19 | 2023-04-18 | 中国人民解放军军事科学院国防工程研究院 | Polyacid-based photochromic material and preparation method thereof |
| CN110470389B (en) * | 2019-09-06 | 2022-06-21 | 京东方科技集团股份有限公司 | Ultraviolet sensor, intelligent device and preparation method |
| CN115262284A (en) * | 2022-07-27 | 2022-11-01 | 华南理工大学 | Intelligent waterproof photochromic paper and preparation method thereof |
| CN116688885A (en) * | 2023-04-25 | 2023-09-05 | 湖北三峡实验室 | Irreversible ultraviolet photochromic microcapsule and preparation method thereof |
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