Water-based anti-forgery ink and preparation method thereof

Abstract

The invention discloses water-based anti-forgery ink and a preparation method thereof. The water-based anti-forgery ink is prepared from the following raw materials in parts by weight: 40-47 parts of composite water-based resin, 15-20 parts of a composite photochromic material, 3-5 parts of water-based organic silicon modified acrylic resin, 2-3 parts of a composite surfactant, 1.5-2 parts of an antioxidant 1010, 0.5-1 part of a benzotriazole ultraviolet absorbent and 15-20 parts of deionized water. And carrying out step-by-step treatment by adopting the working procedures of high-pressure homogenization, high-speed stirring and high-pressure homogenization. The water-based anti-forgery ink disclosed by the invention has excellent adhesion fastness and glossiness, good color changing ability, excellent weather resistance and chemical resistance, the anti-forgery effect of the water-based anti-forgery ink is greatly improved, and the durability is good.

Description

Technical Field

[0001] The invention relates to a water-based anti-counterfeiting ink and a preparation method thereof, belonging to the technical field of inks. Background Art

[0002] Anti-counterfeiting ink is one of the important methods in the field of anti-counterfeiting today. It is used to make anti-counterfeiting labels, product packaging, etc. to protect the intellectual property rights, brand image and market competition of products. Existing anti-counterfeiting inks have poor anti-counterfeiting ability due to poor adhesion. In addition, when encountering some chemical substances or encountering harsh external environments, they lose their anti-counterfeiting effect, have poor durability and short service life. Summary of the invention

[0003] In order to address at least one problem existing in the above-mentioned prior art, the present invention provides a water-based anti-counterfeiting ink and a preparation method thereof. The water-based anti-counterfeiting ink has excellent adhesion fastness and glossiness, and its color changing ability does not turn yellow or weaken. It has good color changing ability and also has excellent weather resistance and chemical resistance.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a water-based anti-counterfeiting ink, comprising the following raw materials in parts by weight: 40-47 parts of a composite water-based resin, 15-20 parts of a composite photochromic material, 3-5 parts of a water-based silicone-modified acrylic resin, 2-3 parts of a composite surfactant, 1.5-2 parts of an antioxidant 1010, 0.5-1 parts of a benzotriazole ultraviolet absorber and 15-20 parts of deionized water; The composite water-based resin is composed of water-based polyurethane resin, water-based acrylic resin and water-based polyvinyl alcohol resin; The composite photochromic material is composed of a diarylethene organic photochromic material and nano titanium dioxide; The composite surfactant consists of sodium dodecyl diphenyl ether disulfonate and a nonionic surfactant.

[0005] Preferably, the composite water-based resin is composed of 45-50% water-based polyurethane resin, 35-40% water-based acrylic resin and 15-20% water-based polyvinyl alcohol resin, calculated by mass fraction.

[0006] Preferably, the viscosity of the waterborne polyurethane resin is 50-70 mPa·s, the viscosity of the waterborne acrylic resin is 280-320 mPa·s, and the viscosity of the waterborne polyvinyl alcohol resin is 120-150 mPa·s.

[0007] Preferably, the composite photochromic material is composed of 55-60% of diarylethene organic photochromic material and 40-45% of nano titanium dioxide, calculated by mass fraction.

[0008] Preferably, the diarylethene organic photochromic material is one of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride, 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene and the like.

[0009] Preferably, the particle size of the nano titanium dioxide is 100-200 nm.

[0010] Preferably, the composite surfactant is composed of 60-65% sodium dodecyl diphenyl ether disulfonate and 35-40% nonionic surfactant, calculated by mass fraction.

[0011] Preferably, the nonionic surfactant is one of NOVELUTION LE407K, LS-114, Dynol 604 and the like.

[0012] Preferably, the benzotriazole ultraviolet absorber is one of ultraviolet absorber UV-P, ultraviolet absorber UV-326, external absorber UV-329 and the like.

[0013] The present invention also provides a method for preparing a water-based anti-counterfeiting ink, comprising the following steps: (1) The composite surfactant and deionized water are mixed evenly, and then the composite photochromic material is added and stirred evenly, and then the first high-pressure homogenization is performed to obtain a mixture A; (2) adding water-based silicone-modified acrylic resin to mixture A and stirring evenly, then adding antioxidant 1010 and benzotriazole ultraviolet absorber and stirring evenly, and then stirring at a high speed to mix evenly to obtain mixture B; (3) Add the composite water-based resin to mixture B and stir evenly, and then perform a second high-pressure homogenization to obtain a water-based anti-counterfeiting ink.

[0014] Preferably, in step (1), the pressure of the first high-pressure homogenization is 80-100 MPa, and the homogenization time is 2-3 s.

[0015] Preferably, in step (2), the high-speed stirring rate is 1800-2200 rpm, and the stirring time is 20-30 min.

[0016] Preferably, in step (3), the pressure of the second high-pressure homogenization is 150-200 MPa, and the homogenization time is 3-5 s.

[0017] The beneficial effects of the present invention are as follows: the water-based anti-counterfeiting ink of the present invention is prepared by a composite water-based resin composed of a water-based polyurethane resin, a water-based acrylic resin and a water-based polyvinyl alcohol resin, a water-based organosilicon-modified acrylic resin and a composite surfactant. The water-based anti-counterfeiting ink does not require an organic solvent and has good adhesion, weather resistance, chemical resistance and color change ability, and is environmentally friendly and practical. The water-based organosilicon-modified acrylic resin, antioxidant and benzotriazole ultraviolet absorber of the present invention work together to make the water-based anti-counterfeiting ink have good weather resistance and color change ability, good durability and extended service life. The present invention uses diarylethenes The composite photochromic material composed of an organic photochromic material and nano titanium dioxide improves the color changing ability of the water-based anti-counterfeiting ink, has a good anti-counterfeiting effect, and further improves its durability; the present invention uses a composite surfactant composed of sodium dodecyl diphenyl ether disulfonate and a non-ionic surfactant to improve the dispersion uniformity of the composite photochromic material while also improving the wettability, uniformity and stability of the water-based anti-counterfeiting ink, thereby promoting the adhesion fastness, color changing ability and glossiness of the water-based anti-counterfeiting ink; the preparation method of the present invention uses high-pressure homogenization to make the water-based anti-counterfeiting ink more refined, effectively improving the glossiness of the ink itself and the printing. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the implementation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. If the specific conditions are not specified in the embodiments, they are carried out according to the normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents, instruments, and components used, they are all conventional products that can be purchased commercially.

[0019] Example 1 A water-based anti-counterfeiting ink comprises the following raw materials in parts by weight: 40 parts of a composite water-based resin, 15 parts of a composite photochromic material, 3 parts of a water-based silicone-modified acrylic resin, 2 parts of a composite surfactant, 1.5 parts of an antioxidant 1010, 0.5 parts of an ultraviolet absorber UV-P, and 20 parts of deionized water; The specific preparation steps are as follows: (1) A composite surfactant consisting of 1.24 parts of sodium dodecyl diphenyl ether disulfonate and 0.76 parts of NOVELUTION LE407K and 20 parts of deionized water were mixed evenly, and then a composite photochromic material consisting of 8.55 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride and 6.45 parts of nano-titanium dioxide with a particle size of 100-200 nm was added and stirred evenly, and then the first high-pressure homogenization was performed at 90 MPa for 2.5 seconds to obtain a mixture A; (2) Add 3 parts of water-based silicone-modified acrylic resin to mixture A and stir evenly, then add 1.5 parts of antioxidant 1010 and 0.5 parts of ultraviolet absorber UV-P and stir evenly, and then stir at a high speed of 2000 rpm for 25 minutes to obtain mixture B; (3) A composite aqueous resin consisting of 18.8 parts of an aqueous polyurethane resin having a viscosity of 60 mPa·s, 14.8 parts of an aqueous acrylic resin having a viscosity of 300 mPa·s, and 6.4 parts of an aqueous polyvinyl alcohol resin having a viscosity of 130 mPa·s was added to mixture B and stirred evenly, and then a second high-pressure homogenization was performed at 180 MPa for 4 seconds to obtain an aqueous anti-counterfeiting ink.

[0020] Example 2 A water-based anti-counterfeiting ink, comprising the following raw materials in parts by weight: 43 parts of a composite water-based resin, 18 parts of a composite photochromic material, 4 parts of a water-based silicone-modified acrylic resin, 2.5 parts of a composite surfactant, 1.8 parts of an antioxidant 1010, 0.8 parts of an ultraviolet absorber UV-P, and 17 parts of deionized water; The specific preparation steps are as follows: (1) A composite surfactant consisting of 1.55 parts of sodium dodecyl diphenyl ether disulfonate and 0.95 parts of NOVELUTION LE407K and 17 parts of deionized water were mixed evenly, and then a composite photochromic material consisting of 10.26 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride and 7.74 parts of nano-titanium dioxide with a particle size of 100-200 nm was added and stirred evenly, and then the mixture was subjected to a first high-pressure homogenization at 90 MPa for 2.5 seconds to obtain a mixture A; (2) Add 4 parts of waterborne silicone-modified acrylic resin to mixture A and stir evenly, then add 1.8 parts of antioxidant 1010 and 0.8 parts of ultraviolet absorber UV-P and stir evenly, and then stir at a high speed at 2000 rpm for 25 minutes to obtain mixture B; (3) A composite aqueous resin consisting of 20.21 parts of an aqueous polyurethane resin having a viscosity of 60 mPa·s, 15.91 parts of an aqueous acrylic resin having a viscosity of 300 mPa·s, and 6.88 parts of an aqueous polyvinyl alcohol resin having a viscosity of 130 mPa·s was added to mixture B and stirred evenly, followed by a second high-pressure homogenization at 180 MPa for 4 seconds to obtain an aqueous anti-counterfeiting ink.

[0021] Example 3 A water-based anti-counterfeiting ink, comprising the following raw materials in parts by weight: 47 parts of a composite water-based resin, 20 parts of a composite photochromic material, 5 parts of a water-based silicone-modified acrylic resin, 3 parts of a composite surfactant, 2 parts of an antioxidant 1010, 1 part of an ultraviolet absorber UV-P, and 15 parts of deionized water; The specific preparation steps are as follows: (1) A composite surfactant consisting of 1.55 parts of sodium dodecyl diphenyl ether disulfonate and 0.95 parts of NOVELUTION LE407K and 17 parts of deionized water were mixed evenly, and then a composite photochromic material consisting of 10.26 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride and 7.74 parts of nano-titanium dioxide with a particle size of 100-200 nm was added and stirred evenly, and then the mixture was subjected to a first high-pressure homogenization at 90 MPa for 2.5 seconds to obtain a mixture A; (2) Add 4 parts of waterborne silicone-modified acrylic resin to mixture A and stir evenly, then add 1.8 parts of antioxidant 1010 and 0.8 parts of ultraviolet absorber UV-P and stir evenly, and then stir at a high speed at 2000 rpm for 25 minutes to obtain mixture B; (3) A composite aqueous resin consisting of 22.09 parts of an aqueous polyurethane resin having a viscosity of 60 mPa·s, 17.39 parts of an aqueous acrylic resin having a viscosity of 300 mPa·s, and 7.52 parts of an aqueous polyvinyl alcohol resin having a viscosity of 130 mPa·s was added to mixture B and stirred evenly, followed by a second high-pressure homogenization at 180 MPa for 4 seconds to obtain an aqueous anti-counterfeiting ink.

[0022] Example 4 A water-based anti-counterfeiting ink, comprising the following raw materials in parts by weight: 45 parts of a composite water-based resin, 16 parts of a composite photochromic material, 3.5 parts of a water-based silicone-modified acrylic resin, 2 parts of a composite surfactant, 1.5 parts of an antioxidant 1010, 0.5 parts of an ultraviolet absorber UV-P, and 18 parts of deionized water; The specific preparation steps are as follows: (1) A composite surfactant consisting of 1.24 parts of sodium dodecyl diphenyl ether disulfonate and 0.76 parts of NOVELUTION LE407K and 18 parts of deionized water were mixed evenly, and then a composite photochromic material consisting of 9.12 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride and 6.88 parts of nano-titanium dioxide with a particle size of 100-200 nm was added and stirred evenly, and then a first high-pressure homogenization was performed at 90 MPa for 2.5 seconds to obtain a mixture A; (2) Add 4 parts of waterborne silicone-modified acrylic resin to mixture A and stir evenly, then add 1.5 parts of antioxidant 1010 and 0.5 parts of ultraviolet absorber UV-P and stir evenly, and then stir at a high speed at 2000 rpm for 25 minutes to obtain mixture B; (3) A composite aqueous resin consisting of 21.15 parts of an aqueous polyurethane resin having a viscosity of 60 mPa·s, 16.65 parts of an aqueous acrylic resin having a viscosity of 300 mPa·s, and 7.2 parts of an aqueous polyvinyl alcohol resin having a viscosity of 130 mPa·s was added to mixture B and stirred evenly, followed by a second high-pressure homogenization at 180 MPa for 4 seconds to obtain an aqueous anti-counterfeiting ink.

[0023] Example 5 The raw materials and weight proportions of a water-based anti-counterfeiting ink are exactly the same as those in Example 1, and the preparation steps are partially the same, except that: in step (1), the first high-pressure homogenization is performed at 80 MPa for 3 seconds; in step (2), high-speed stirring is performed at 2200 rpm for 30 minutes; and in step (3), the first high-pressure homogenization is performed at 150 MPa for 3 seconds.

[0024] Example 6 The raw materials and weight proportions of a water-based anti-counterfeiting ink are the same as those in Example 1, and the preparation steps are partially the same, except that: in step (1), the first high-pressure homogenization is performed at 100 MPa for 2 seconds; in step (2), high-speed stirring is performed at 1800 rpm for 20 minutes; and in step (3), the first high-pressure homogenization is performed at 200 MPa for 5 seconds.

[0025] Example 7 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that in the composite water-based resin, the viscosity of the water-based polyurethane resin is 70 mPa·s, the viscosity of the water-based acrylic resin is 320 mPa·s, and the viscosity of the water-based polyvinyl alcohol resin is 150 mPa·s.

[0026] Example 8 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that in the composite water-based resin, the viscosity of the water-based polyurethane resin is 50 mPa·s, the viscosity of the water-based acrylic resin is 280 mPa·s, and the viscosity of the water-based polyvinyl alcohol resin is 130 mPa·s.

[0027] Example 9 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: in 40 parts of the composite water-based resin, it is composed of 18 parts of a water-based polyurethane resin with a viscosity of 60 mPa·s, 14 parts of a water-based acrylic resin with a viscosity of 300 mPa·s, and 8 parts of a water-based polyvinyl alcohol resin with a viscosity of 130 mPa·s.

[0028] Example 10 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 9, and the preparation steps are the same, except that: in 15 parts of the composite photochromic material, 8.25 parts of 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene and 6.75 parts of nano titanium dioxide with a particle size of 100~200nm are used.

[0029] Embodiment 11 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 10, and the preparation steps are the same, except that: in 2 parts of the composite surfactant, it is composed of 1.2 parts of sodium dodecyl diphenyl ether disulfonate and 0.8 parts of LS-114.

[0030] Example 12 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 11, and the preparation steps are the same, except that: 0.5 parts of ultraviolet absorber UV-326.

[0031] Embodiment 13 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: in 40 parts of the composite water-based resin, 18 parts of water-based polyurethane resin with a viscosity of 60 mPa·s, 16 parts of water-based acrylic resin with a viscosity of 300 mPa·s and 6 parts of water-based polyvinyl alcohol resin with a viscosity of 130 mPa·s are used; in 15 parts of the composite photochromic material, 9 parts of 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene and 6 parts of nano titanium dioxide with a particle size of 100-200 nm are used; in 2 parts of the composite surfactant, 1.3 parts of sodium dodecyl diphenyl oxide disulfonate and 0.7 parts of Dynol 604 are used; and 0.5 parts of ultraviolet absorber UV-329 are used.

[0032] Embodiment 14 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: in 40 parts of the composite water-based resin, 20 parts of water-based polyurethane resin with a viscosity of 60 mPa·s, 14 parts of water-based acrylic resin with a viscosity of 300 mPa·s and 6 parts of water-based polyvinyl alcohol resin with a viscosity of 130 mPa·s are used; in 15 parts of the composite photochromic material, 9 parts of 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene and 6 parts of nano titanium dioxide with a particle size of 100-200 nm are used; in 2 parts of the composite surfactant, 1.3 parts of sodium dodecyl diphenyl ether disulfonate and 0.7 parts of NOVELUTION LE407K are used; and 0.5 parts of ultraviolet absorber UV-329 are used.

[0033] Comparative Example 1 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 40 parts of a water-based polyurethane resin with a viscosity of 60 mPa·s replace 40 parts of a composite water-based resin.

[0034] Comparative Example 2 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 40 parts of a water-based acrylic resin with a viscosity of 300 mPa·s replace 40 parts of a composite water-based resin.

[0035] Comparative Example 3 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 15 parts of the composite photochromic material are replaced by 15 parts of nano titanium dioxide with a particle size of 100-200 nm.

[0036] Comparative Example 4 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 15 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride replace 15 parts of the composite photochromic material.

[0037] Comparative Example 5 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 2 parts of sodium dodecyl diphenyl ether disulfonate replace 2 parts of the composite surfactant.

[0038] Comparative Example 6 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that 2 parts of NOVELUTION LE407K replace 2 parts of the composite surfactant.

[0039] Comparative Example 7 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: in 15 parts of the composite photochromic material, 8.55 parts of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride and 6.45 parts of nano titanium dioxide with a particle size of 1-2 μm are used.

[0040] Comparative Example 8 The raw materials and weight proportions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that the silane coupling agent KH550 replaces the water-based silicone-modified acrylic resin.

[0041] Comparative Example 9 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: no benzotriazole ultraviolet absorber is included, and the antioxidant 1010 is 2 parts.

[0042] Comparative Example 10 The raw materials and weight portions of a water-based anti-counterfeiting ink are partially the same as those in Example 1, and the preparation steps are the same, except that: the antioxidant 1010 is not included, and the benzotriazole ultraviolet absorber is 2 parts.

[0043] Comparative Example 11 The raw materials and weight proportions of a water-based anti-counterfeiting ink are the same as those in Example 1, and the preparation steps are partially the same, except that: in step (1), high-speed stirring is performed at 4000 rpm for 20 min; in step (2), high-speed stirring is performed at 1800 rpm for 20 min; and in step (3), a first high-pressure homogenization is performed at 200 MPa for 5 s.

[0044] Comparative Example 12 The raw materials and weight proportions of a water-based anti-counterfeiting ink are the same as those in Example 1, and the preparation steps are partially the same, except that: in step (1), high-speed stirring is performed at 4000 rpm for 20 min; in step (2), high-speed stirring is performed at 1800 rpm for 20 min; and in step (3), high-speed stirring is performed at 4000 rpm for 20 min.

[0045] The performance of the water-based anti-counterfeiting inks prepared in Examples 1 to 14 and Comparative Examples 1 to 13 was evaluated, and the results are shown in Tables 1 and 2: 1. Adhesion strength: According to national standard GB / T 13217.7-2009.

[0046] 2. Weather resistance: According to the standard GB / T22467.2-2008, evaluate the heat resistance, hot water resistance and light resistance. The evaluation criteria are: Level 1 means the anti-counterfeiting feature disappears, Level 2 means obvious changes, Level 3 means slight changes, Level 4 means basically no changes, and Level 5 means no changes.

[0047] 3. Chemical resistance: According to the standard GB / T22467.2-2008, water resistance, acid and alkali water resistance and gasoline resistance are evaluated. The evaluation criteria are: Level 1 means the anti-counterfeiting feature disappears, Level 2 means obvious changes, Level 3 means slight changes, Level 4 means basically no changes, and Level 5 means no changes.

[0048] 4. Color changing ability: Exposure to sunlight for 3 days or exposure to ultraviolet light for 2 hours.

[0049] 5. Gloss: Use a gloss meter to measure, and gloss is expressed as mirror gloss, with the unit being %; the higher the gloss percentage, the better the mirror effect and the higher the gloss.

[0050] Table 1 Performance evaluation of Examples 1 to 14

[0051] Table 2 Performance evaluation of comparative examples 1 to 12

[0052] In combination with Table 1 and Table 2, it can be seen from the comparison between Example 1 and Comparative Example 2 that, with other conditions remaining unchanged, the composite aqueous resin composed of aqueous polyurethane resin, aqueous acrylic resin and aqueous polyvinyl alcohol resin is selected, so that the aqueous anti-counterfeiting ink of the present invention has better adhesion fastness, glossiness, weather resistance and chemical resistance, and the color changing ability does not turn yellow or weaken, has good anti-counterfeiting effect and durability, and is environmentally friendly and practical.

[0053] Compared with Comparative Examples 3 and 4, Example 1 shows that, with other conditions unchanged, the composite photochromic material composed of diarylethene organic photochromic material and nano-titanium dioxide is used to improve the gloss, weather resistance and chemical resistance of the water-based anti-counterfeiting ink, and the color changing ability does not turn yellow or weaken, the color changing ability is better, the durability is good, and the service life is extended. Compared with Comparative Example 7, in Example 1, nano-grade titanium dioxide can better promote the improvement of the gloss of the water-based anti-counterfeiting ink of the present invention, and further enhance the anti-counterfeiting effect and durability.

[0054] Compared with Example 1, it can be seen that, under other conditions unchanged, Comparative Examples 5 and Comparative Examples 6 use sodium dodecyl diphenyl oxide disulfonate or NOVELUTION LE407K alone, and the adhesion fastness, glossiness, weather resistance, chemical resistance, and color change ability of the water-based anti-counterfeiting ink do not turn yellow but are weakened, and the color change ability is poor. Therefore, a composite surfactant composed of sodium dodecyl diphenyl oxide disulfonate and a non-ionic surfactant is used to make the composite photochromic material more dispersed and uniform, which can further improve the wettability, uniformity and stability of the water-based anti-counterfeiting ink, thereby promoting the improvement of the adhesion fastness, color change ability and glossiness of the water-based anti-counterfeiting ink of the present invention.

[0055] Comparing Example 1 with Comparative Examples 8 to 10, it can be seen that, with other conditions unchanged, the water-based silicone-modified acrylic resin, antioxidant, and benzotriazole ultraviolet absorber work together to make the water-based anti-counterfeiting ink of the present invention have good weather resistance and color change ability, good anti-counterfeiting effect, good durability, and extended service life.

[0056] Comparing Example 1 with Comparative Examples 11 to 12, it can be seen that, with other conditions unchanged, the water-based anti-counterfeiting ink of the present invention is processed by a process of high-pressure homogenization-high-speed stirring-high-pressure homogenization, which further improves the adhesion fastness and glossiness of the water-based anti-counterfeiting ink of the present invention, and also makes the color changing ability better, thereby making the anti-counterfeiting effect good, the durability good, and the service life extended.

[0057] In summary, the water-based anti-counterfeiting ink of the present invention has excellent adhesion fastness and glossiness, and its color changing ability does not turn yellow or weaken, and it has good color changing ability, and also has excellent weather resistance and chemical resistance, which greatly improves the anti-counterfeiting effect of the water-based anti-counterfeiting ink, has good durability, and extends the service life.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit and essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A water-based anti-counterfeiting ink, characterized in that: The invention comprises the following raw materials in parts by weight: 40-47 parts of composite water-based resin, 15-20 parts of composite photochromic material, 3-5 parts of water-based silicone-modified acrylic resin, 2-3 parts of composite surfactant, 1.5-2 parts of antioxidant 1010, 0.5-1 parts of benzotriazole ultraviolet absorber and 15-20 parts of deionized water; The composite water-based resin is composed of water-based polyurethane resin, water-based acrylic resin and water-based polyvinyl alcohol resin; The composite photochromic material is composed of a diarylethene organic photochromic material and nano titanium dioxide; The composite surfactant consists of sodium dodecyl diphenyl ether disulfonate and a nonionic surfactant.

2. The water-based anti-counterfeiting ink according to claim 1, characterized in that: The composite water-based resin is composed of 45-50% water-based polyurethane resin, 35-40% water-based acrylic resin and 15-20% water-based polyvinyl alcohol resin, calculated by mass fraction; the viscosity of the water-based polyurethane resin is 50-70 mPa·s, the viscosity of the water-based acrylic resin is 280-320 mPa·s, and the viscosity of the water-based polyvinyl alcohol resin is 120-150 mPa·s.

3. The water-based anti-counterfeiting ink according to claim 1, characterized in that: The composite photochromic material is composed of 55-60% of a diarylethene organic photochromic material and 40-45% of nano titanium dioxide, calculated by mass fraction; the diarylethene organic photochromic material is one of 2,3-bis(2,4,5-trimethyl-3-thienyl)maleic anhydride or 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene.

4. The water-based anti-counterfeiting ink according to claim 1, characterized in that: The particle size of the nano titanium dioxide is 100-200 nm.

5. The water-based anti-counterfeiting ink according to claim 1, characterized in that: The composite surfactant is composed of 60-65% of sodium dodecyl diphenyl ether disulfonate and 35-40% of a nonionic surfactant, calculated by mass fraction; the nonionic surfactant is one of NOVELUTION LE407K, LS-114 or Dynol 604.

6. The water-based anti-counterfeiting ink according to claim 1, characterized in that: The benzotriazole ultraviolet absorber is one of ultraviolet absorber UV-P, ultraviolet absorber UV-326 or external absorber UV-329.

7. A method for preparing the water-based anti-counterfeiting ink according to claim 1, characterized in that: The following steps are involved: (1) The composite surfactant and deionized water are mixed evenly, and then the composite photochromic material is added and stirred evenly, and then the first high-pressure homogenization is performed to obtain a mixture A; (2) adding water-based silicone-modified acrylic resin to mixture A and stirring evenly, then adding antioxidant 1010 and benzotriazole ultraviolet absorber and stirring evenly, and then stirring at a high speed to mix evenly to obtain mixture B; (3) Add the composite water-based resin to mixture B and stir evenly, and then perform a second high-pressure homogenization to obtain a water-based anti-counterfeiting ink.

8. The method for preparing a water-based anti-counterfeiting ink according to claim 7, characterized in that: In step (1), the pressure of the first high-pressure homogenization is 80-100 MPa, and the homogenization time is 2-3 s.

9. The method for preparing a water-based anti-counterfeiting ink according to claim 7, characterized in that: In step (2), the high-speed stirring rate is 1800-2200 rpm, and the stirring time is 20-30 min.

10. The method for preparing a water-based anti-counterfeiting ink according to claim 7, characterized in that: In step (3), the pressure of the second high-pressure homogenization is 150-200 MPa, and the homogenization time is 3-5 s.

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