Photochromic material is that a kind of material indoline spiro-pyrans class that can change color under UV-light or other radiation exposure rapidly is the photochromic compound of fully studying, and such material is very limited on the purposes owing to the resistance to fatigue deficiency.The Luo oxazine is another kind of photochromic organism.Recently studies show that this type organic has superior chemical stability and resistance to fatigue than spiro-pyrans, so application potential is very big.Several patents (day disclosure special permission communique 87-172,075/88-196,673/88-305,181 are arranged; 90-20,576; 91-81,378) relate to and utilize the Luo oxazine to make pen or garden pearl board pen ink, or be used for the heat transfer printing of textiles, when being used for the printing of paper, because the influence of factors such as viscosity, flowability, meeting generation inadaptability photochromic compound more or less is used to make the anti-counterfeit printing material also report (EP279,600; WO88-01,288; CN1,044,860A), but used dyestuff is a fulgides, preparation process is many, processed complex, printing is still needed special light sources could variable color.
The purpose of this invention is to provide a kind of photochromism anti-forging printing-ink and manufacture method thereof, can overcome the deficiencies in the prior art part, make not only changeable colour under ultraviolet ray or other radiation exposure of printed pattern, and under common sunlight also changeable colour.
Implementation procedure of the present invention:
1, photochromism anti-forging printing-ink provided by the invention mainly is made up of photochromic dyes, low-melting ink vehicle and ancillary component thereof.
1. photochromic dyes of the present invention is the key component of anti-counterfeit printing printing ink, and it belongs to spiral shell indoline Nai Bing oxazine compounds, and its chemical structural formula is:
R wherein
1Be C
1-C
18Alkyl, aralkyl , oxazine alkyl; R
2, R
3Be methyl; R
4Be hydrogen, methyl or methoxy; R
5Be hydrogen or ethoxycarbonyl; R
6Be hydrogen hydroxyl, chlorine or bromine.Such dyestuff is low-melting white or faint yellow solid, to light, heat, air-stable, but weak acid resistant or weakly alkaline environment.Its solution changes blueness or bluish voilet rapidly under UV-light or direct sunlight, when removing ultraviolet source or breaking away from direct sunlight, restore to the original state again, and above variable color process can be carried out repeatedly, does not lose efficacy for a long time.
2. low-melting ink vehicle of the present invention is the main component of anti-counterfeit printing printing ink, and it belongs to polyolefin resin, as if the multipolymer of polyethylene, polypropylene, polystyrene and vinylbenzene and divinyl.For adapting to requirement of the present invention, several resins can be used with certain proportioning sometimes.Wherein as low-melting ink vehicle of the present invention best be styrene-butadiene block copolymer, this resin appearance colorless is transparent, good film-forming property is good with above-mentioned dyestuff intermiscibility.In order to make anti-forgery ink, these resins need to be dissolved earlier as low-melting ink vehicle.Solvent commonly used has aromatic hydrocarbons, as benzene,toluene,xylene or chlorobenzene; The ester class is as ethyl acetate, butylacetate, pentyl acetate or phthalic acid ester class; Also have paraffin hydro carbons, ethers and ketone in addition.All be to form mixed solvent as a rule, to satisfy the requirement of solvability and volatility coupling with several organism.
3. auxiliary composition of the present invention has tensio-active agent, photostabilizer and filler etc.Tensio-active agent commonly used is a non-ionic type, as sorbester p17, polysorbate40, peregal 0 etc.; Photostabilizer is thiobisphenol and nickel complex thereof, steric hindrance amine; Filler is the vitriol of calcium, magnesium or the oxide compound of carbonate and some metal etc.
2, in manufacture craft of the present invention, at first be that dyestuff and photostabilizer are mixed with dissolved low-melting ink vehicle with above-mentioned solvent solution-forming, add other ancillary component again and process.Dye dosage is the 0.1-1.0% of low-melting ink vehicle weight, and the consumption of tensio-active agent and photostabilizer and dyestuff quite or slightly lack in the ancillary component, and the add-on of filler requires to decide according to the viscosity of printing ink.Each ancillary component should be even with dyestuff, low-melting ink vehicle thorough mixing, preferably grinds on three-roller or ball mill, so far can obtain photochromism anti-forging printing-ink of the present invention.
Anti-forgery ink provided by the invention is applicable to the printing of various stocks, and as the enamelled paper of different size, newsprinting paper, gelatine printing paper, and polyethylene film and textiles etc. are most convenient with the screen printing mode.Be mainly used in trade mark, security and vital document false proof.When differentiating the true and false of these printed matters, as long as the pattern secret mark that will utilize the present invention to print places under common sunlight or the UV-light, as rapid generation variable color, very fast again recovery when leaving illumination then is a genuine piece, then is counterfeit as above-mentioned phenomenon not occurring.
Advantage of the present invention is: 1. use the pattern secret mark of ink printing of the present invention not only under specific light source such as UV-light, can develop the color, and under sunlight also changeable colour; 2. its variable color process is a reversible, and variable color speed is fast, long service life, and printed matter can be preserved more than 1 year; 3. the fastness of printed matter, sharpness etc. all can make the user satisfied; 4. starting material required for the present invention are easy to get, and the photochromic dyes manufacture method is simple, and the printing ink manufacturing is also more convenient.
The invention will be further described below by example:
Example 1, with 10 parts of benzene fourth block resin<research institute of Lan Hua company products〉be dissolved in 20 parts of mixed solvents (being lower than 250 ℃ ink oil 8 by boiling point, dimethylbenzene 6,1 part of composition of diethyl phthalate 5 and paraffin wax), obtain water white transparency heavy-gravity low-melting ink vehicle (A), with dyestuff SP-0-5 (R among the formula @
1-4Be CH
3-, R
5-6Be H), photostabilizer (thiobisphenol type) and peregal 0 each portion are dissolved in the suitable N-BUTYL ACETATE jointly, obtain the transparent liquid of oyster (B).To fully grind below 30 ℃ in A and B and 5 parts of Place grinding machines of light calcium carbonate, get white uniform jelly, anti-forgery ink promptly of the present invention.The pattern secret mark that obtains with silk screen printing is difficult for differentiating, but when placing under ultraviolet lamp or the sunlight, just demonstrates the blue marking of analysing clearly immediately.Leave light source, color disappears in can be in several seconds.Printing was preserved under usual condition more than 1 year, and its painted and colour killing performance does not have considerable change.
Example 2, not existing together with example 1 is that dyestuff is BSP-0 (R in the formula
2-3Be CH
3-, R
4-6Be H, R
1Wei the oxazine butyl, consumption is 0.5% of an amount of resin, and with N-BUTYL ACETATE/dimethylbenzene (1: 1) dissolving with preparation B, the performance of gained printing ink and printing is consistent with example 1.
Example 3, with example 1 difference be the resin polystyrene, dyestuff is with SP-0-16 (R among the formula @
1=C
16H
33, R
2-3=CH
3, R
4-6=H), dye dosage is 1% of a resin.Gained printing ink is consistent with example 1 with the printing performance