Copying-proof film and preparation method thereof
A copying film and anti-copying technology, which is applied in the printing process and other directions, can solve the problems of complex multi-layer anti-copying film process and increase the difficulty of reading, and achieve good reading effect, good reading effect, and good stability
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[0037] The steps of the anti-copying film preparation method of the present invention include: rapidly stirring the mixture containing photochromic agent, photosensitizer and nitrovarnish to fully mix; wet grinding for 3-10 minutes, more preferably about 4-8 minutes, most preferably 5 minutes; use 5-10% NaOH solution, preferably 10% NaOH solution, to adjust the pH value of the mixture to 8-10, and then coat it into a film with a thickness of 50-200 μm on the cellulose paper medium. It is preferably applied to a thickness of 80 to 180 μm, for example, to be applied to a thickness of 80 μm, 90 μm, 100 μm, 120 μm, 140 μm and 150 μm. In the preparation method, the weight ratio of photochromic agent, photosensitizer and nitro varnish is usually 2-5:2-20:30-90, preferably 2-3:2-10:30-60. More preferably, the photochromic agent is spiropyran or spirooxazine, the photosensitizer is 4-aminoacetophenone or diphenyl ketone, and the nitrovarnish is cellulose nitrate. The coating and film...
Embodiment 1
[0042] 2.0 g of 6,8-dibromo-1',3',3'-trimethylspiro(indoline-2,2'[2H]benzo[b]pyran), 4-aminoacetophenone 2.0g, cellulose nitrate (nitro varnish manufactured by Red Lion Paint International Co., Ltd.) 35g, 1,3-butanediol 0.5g, methyl silicone oil 0.5g and an appropriate amount of thinner are stirred quickly to fully mix, and then wet Grind for about 6 minutes, and adjust the pH value to 8-9 with 10% NaOH solution. Then coated on paper documents with SZQ wet film preparer. After curing, the coating film was orange and had a film thickness of 150 μm. After the obtained document was left at room temperature for 200 days and copied in a black and white copier, the obtained copy was unreadable and had a uniform black background. Among them, the copying effect of printing paper with printed characters is shown in figure 1 .
Embodiment 2
[0044] 6-nitro-1',3',3'-trimethylspiro(indoline-2,2'[2H]benzo[b]pyran) 1.5g, 4-aminoacetophenone 2.0g , cellulose nitrate (nitro varnish manufactured by Red Lion Paint International Co., Ltd.) 35g, 1,3-butanediol 0.5g, methyl silicone oil 0.5g and an appropriate amount of diluent were stirred quickly to fully mix, and then wet ground for 5 Minutes or so, adjust the pH value to 8-9 with 10% NaOH solution. It is then applied to paper documents using a wet film preparer. After curing, the coating film was orange and had a film thickness of 180 μm. After the obtained document was left at room temperature for 200 days and copied in a black and white copier, the obtained copy was unreadable and had a uniform black background.
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Abstract
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