A solvent-resistant and abrasion-resistant variable serial number environmentally friendly label and its preparation method

Abstract

The present invention relates to the field of label technology, and specifically to a solvent-resistant, abrasion-resistant, variable-number environmentally friendly label and a preparation method thereof. The solvent-resistant, abrasion-resistant, variable-number environmentally friendly label comprises a protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate arranged in sequence from top to bottom. The digital ink is used for spraying a variable serial number, and the relevant information of the corresponding product can be queried through the variable serial number. The first UV glue and the second UV glue have good wear resistance and solvent resistance. The digital ink has solvent resistance, and the coating liquid has strong bonding strength and solvent resistance, stable connection, and easy use. The preparation method of the solvent-resistant, abrasion-resistant, variable-number environmentally friendly label has a simple process and is easy to control in operation, which is conducive to large-scale industrial production. The obtained solvent-resistant, abrasion-resistant, variable-number environmentally friendly label has stable quality and excellent comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the technical field of labels, and in particular to a solvent-resistant, abrasion-resistant, variable-serial-number environmentally friendly label and a preparation method thereof. Background Art

[0002] Digital printing is a comprehensive technology developed based on printing. It uses electronic documents as the carrier and transmits them to digital printing equipment through network transmission to achieve direct printing. Unlike the cumbersome process of traditional printing, digital printing is characterized by the lack of plates and variable information in the printing production process. It covers a variety of technical fields such as printing, electronics, computers, networks, and communications. However, due to technical reasons, most digital inks on the market currently have problems with fragility, adhesion, solvent resistance, and curing properties. In particular, low- and mid-range digital inks are printed on thin film products with low interfacial free energy (such as PET, PP, and PVC). Due to the low bonding strength, the printed layer is very easy to fall off, which causes inconvenience in the use of labels and fails to meet the needs of consumers. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a solvent-resistant, abrasion-resistant, variable-number environmentally friendly label, which is solvent-resistant, has high wear resistance and strong bonding strength, and is highly practical.

[0004] The preparation method of the solvent-resistant, abrasion-resistant, variable-number environmentally friendly label of the present invention has a simple process, easy-to-control operation, and is conducive to large-scale industrial production. The prepared solvent-resistant, abrasion-resistant, variable-number environmentally friendly label has stable quality, is solvent-resistant, and also has the characteristics of high wear resistance and strong bonding strength, and has excellent comprehensive performance.

[0005] The purpose of the present invention is achieved through the following technical solution: a solvent-resistant and abrasion-resistant variable serial number environmentally friendly label, including a protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate arranged in sequence from top to bottom.

[0006] In the above technical solution, the protective layer includes a first protective layer and a second protective layer provided at the lower end of the first protective layer.

[0007] In the above technical solution, the digital ink surface layer and the digital ink bottom layer are both formed by coating digital ink, the first protective layer is formed by coating a first UV glue, the second protective layer is formed by coating a second UV glue, and the first coating liquid layer and the second coating liquid layer are both formed by coating a coating liquid.

[0008] The solvent-resistant and abrasion-resistant variable serial number environmentally friendly label of the present invention includes a first protective layer, a second protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate, which are arranged in sequence from top to bottom. The digital ink surface layer and the digital ink bottom layer are both formed by coating with digital ink, the second protective layer is formed by coating with a second UV glue, and the first coating liquid layer and the second coating liquid layer are both formed by coating with a coating liquid. The digital ink is used to spray a variable serial number, and the relevant information of the corresponding product can be queried through the variable serial number. The first UV glue and the second UV glue have good wear resistance and are also solvent-resistant. The digital ink has solvent resistance, and the coating liquid has strong bonding strength and solvent resistance, and the connection is stable and easy to use.

[0009] In the above technical solution, the thickness of the first protective layer is 2-4 μm, the thickness of the second protective layer is 1-3 μm, the thickness of the digital ink surface layer is 3-5 μm, the thickness of the first coating liquid layer is 2-3 μm, the thickness of the digital ink bottom layer is 2-4 μm, the thickness of the second coating liquid layer is 2-3 μm, and the thickness of the substrate is 0.1-0.3 mm.

[0010] In the above technical solution, the substrate is made of PET film or PP film.

[0011] In the above technical solution, the digital ink comprises the following raw materials in parts by weight: 7-8 parts of pigment, 15-22 parts of acrylic copolymer, 11-15 parts of fluoropolymer resin, 20-45 parts of conductive liquid and 5-10 parts of image oil.

[0012] In the above technical solution, the fluorine-containing polymer resin is polytetrafluoroethylene.

[0013] In the above technical solution, the acrylic copolymer is at least one of poly(ethylene-co-methacrylic acid) and styrene acrylic emulsion.

[0014] In the above technical solution, the pigment includes at least one of Yellow 185, Blue 15, Red 146, carbon black or titanium dioxide.

[0015] In the above technical solution, the pigment used in the surface layer of the digital ink has a high contrast with the pigment used in the bottom layer of the digital ink.

[0016] In the above technical solution, the conductive liquid is prepared by mixing C12-20 isoparaffin, barium sulfonate and alkyd aryl sulfonate in a mass ratio of 8-9:1-2:0.5-0.8.

[0017] In the above technical solution, the barium sulfonate is barium sulfonate of model T701, and the alkyd aryl sulfonate is dodecylbenzenesulfonic acid isopropylamine salt of CAS number 26264-05-1.

[0018] In the above technical solution, the image oil is a mixture of C12-20 isoparaffin and white mineral oil in a mass ratio of 17-19:1-2.

[0019] In the above technical solution, the method for preparing the digital ink comprises the following steps:

[0020] A1: At room temperature, the conductive liquid and the image oil are mixed evenly to obtain a mixture A;

[0021] A2: At room temperature, pigment, acrylic copolymer and fluoropolymer resin are added to mixture A and stirred for 1-3 hours to obtain digital ink.

[0022] In the above technical solution, the first UV glue includes the following raw materials in parts by weight: 25-30 parts of a polymer of maleic rosin, p-tert-butylphenol, formaldehyde and pentaerythritol, 8-11 parts of a polymer of linseed oil, isophthalic acid and trimethylolpropane, 6-8 parts of soybean oil, 1-2 parts of lanolin, 0.8-1.2 parts of a first photoinitiator and 0.8-1.2 parts of polyethylene wax.

[0023] Preferably, the polymer of maleic rosin, p-tert-butylphenol, formaldehyde and pentaerythritol has a CAS number of 68082-96-2; the polymer of linseed oil, isophthalic acid and trimethylolpropane has a CAS number of 67700-81-6.

[0024] In the above technical solution, the first photoinitiator is photoinitiator 1173.

[0025] In the above technical solution, the preparation method of the first UV glue includes the following steps:

[0026] B1: At room temperature, maleic rosin, a polymer of p-tert-butylphenol, formaldehyde and pentaerythritol, a polymer of linseed oil, isophthalic acid and trimethylolpropane, and soybean oil are mixed and stirred for 1-3 hours to obtain a pre-made slurry;

[0027] B2: At room temperature, add lanolin, polyethylene wax and the first photoinitiator to the prefabricated slurry while stirring, and then stir for 10-15 minutes until uniform to obtain the first UV glue.

[0028] In the above technical solution, the second UV glue comprises the following raw materials in parts by weight: 30-50 parts of dipentaerythritol hexaacrylate, 20-25 parts of pentaerythritol triacrylate, 10-20 parts of trimethylolpropane triacrylate, 5-6 parts of acrylic acid, 2.5-10 parts of a second photoinitiator and 1-2 parts of a polymerization inhibitor.

[0029] In the above technical solution, the second photoinitiator is formed by compounding photoinitiator 1173 and photoinitiator TPO in a weight ratio of 9-11:1.

[0030] In the above technical solution, the polymerization inhibitor is p-hydroxyanisole.

[0031] In the above technical solution, the preparation method of the second UV adhesive comprises the following steps: at room temperature, dipentaerythritol hexaacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, acrylic acid, a photoinitiator and an inhibitor are uniformly mixed to obtain a second UV adhesive.

[0032] In the above technical solution, the coating solution comprises the following raw materials in parts by weight: 20-30 parts of polyethyleneimine and 70-80 parts of water.

[0033] A method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0034] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 80-110°C, and keep drying at 80-110°C for 1-3 seconds to form a second coating liquid layer for standby use;

[0035] S2: Under infrared heat preservation at 80-110°C, apply digital ink on the upper surface of the second coating liquid layer under pressure, maintain 80-110°C and dry for 1-3 seconds to form a digital ink bottom layer, and set aside;

[0036] S3: applying the coating liquid on the upper surface of the intermediate product at 80-110°C, maintaining the temperature at 80-110°C and drying for 1-3 seconds to form a first coating liquid layer for later use;

[0037] S4: Under infrared heat preservation at 80-110℃, apply digital ink on the upper surface of the first coating liquid layer under pressure, maintain 80-110℃ and dry for 1-3s to form a digital ink surface layer to obtain an intermediate product for standby use

[0038] S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer and place it under UV light for 0.5-3 seconds to cure to form a second protective layer for later use;

[0039] S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 0.5-3 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0040] In the above technical solution, in step S1, the power of the corona is 1000-1200W.

[0041] In the above technical solution, in steps S2 and S4, the pressure coating is performed by applying a pressure of 180-220 kg in a Carver press to press the corresponding thickness.

[0042] In the above technical solution, in steps S5 and S6, the conditions for ultraviolet lamp irradiation are: UV energy is 80-100J.

[0043] The preparation method of the solvent-resistant, abrasion-resistant, variable-number environmentally friendly label of the present invention has a simple process, easy-to-control operation, and is conducive to large-scale industrial production. The prepared solvent-resistant, abrasion-resistant, variable-number environmentally friendly label has stable quality, is solvent-resistant, and also has the characteristics of high wear resistance and strong bonding strength, and has excellent comprehensive performance.

[0044] The beneficial effects of the present invention are as follows: the solvent-resistant and abrasion-resistant variable serial number environmental protection label of the present invention is sequentially arranged from top to bottom with a first protective layer, a second protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate, and the digital ink surface layer and the digital ink bottom layer are both formed by coating with digital ink, the second protective layer is formed by coating with a second UV glue, and the first coating liquid layer and the second coating liquid layer are both formed by coating with a coating liquid. The digital ink is used for spraying a variable serial number, and the relevant information of the corresponding product can be queried through the variable serial number. The first UV glue and the second UV glue have good wear resistance and are also solvent-resistant. The digital ink has solvent resistance, and the coating liquid has strong bonding strength and solvent resistance, and is firmly connected and easy to use.

[0045] At the same time, the preparation method of the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label has a simple process and easy controllable operation, which is conducive to large-scale industrial production. The prepared solvent-resistant and abrasion-resistant variable serial number environmentally friendly label has stable quality, is solvent-resistant, and also has the characteristics of high wear resistance and strong bonding strength, and has excellent comprehensive performance. DETAILED DESCRIPTION

[0046] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0047] Example 1

[0048] In this embodiment, a solvent-resistant and abrasion-resistant variable serial number environmentally friendly label includes a first protective layer, a second protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate arranged in sequence from top to bottom.

[0049] Furthermore, the digital ink surface layer and the digital ink bottom layer are both formed by coating digital ink, the first protective layer is formed by coating a first UV glue, the second protective layer is formed by coating a second UV glue, and the first coating liquid layer and the second coating liquid layer are both formed by coating a coating liquid.

[0050] Furthermore, the thickness of the first protective layer is 2 μm, the thickness of the second protective layer is 2 μm, the thickness of the digital ink surface layer is 4 μm, the thickness of the first coating liquid layer is 2 μm, the thickness of the digital ink bottom layer is 3 μm, the thickness of the second coating liquid layer is 2 μm, and the thickness of the substrate is 0.15 mm.

[0051] In this embodiment, the substrate is a PET film.

[0052] Furthermore, the digital ink surface layer and the digital ink bottom layer are both formed by coating digital ink, the first protective layer is formed by coating a first UV glue, the second protective layer is formed by coating a second UV glue, and the first coating liquid layer and the second coating liquid layer are both formed by coating a coating liquid.

[0053] Furthermore, the digital ink comprises the following raw materials in parts by weight: 7 parts of pigment, 20 parts of acrylic copolymer, 14 parts of fluorine-containing polymer resin, 32 parts of conductive liquid and 8 parts of image oil.

[0054] Furthermore, the fluorine-containing polymer resin is polytetrafluoroethylene.

[0055] Furthermore, the acrylic acid copolymer is poly(ethylene-co-methacrylic acid). In this embodiment, the CAS number of the poly(ethylene-co-methacrylic acid) is 25053-53-6.

[0056] Furthermore, the pigment used in the surface layer of the digital ink is yellow 185; the pigment used in the bottom layer of the digital ink is titanium dioxide.

[0057] Furthermore, the conductive liquid is prepared by mixing C12-20 isoparaffin, barium sulfonate and alkyd aryl sulfonate in a mass ratio of 8:1:0.6.

[0058] In this embodiment, the barium sulfonate is barium sulfonate of model T701, and the alkyd aryl sulfonate is dodecylbenzenesulfonic acid isopropanolamine salt of CAS number 26264-05-1.

[0059] Furthermore, the image oil is a mixture of C12-20 isoparaffin and white mineral oil in a mass ratio of 18:1.5.

[0060] Furthermore, the preparation method of the digital ink comprises the following steps:

[0061] A1: At room temperature, the conductive liquid and the image oil are mixed evenly to obtain a mixture A;

[0062] A2: Pigment, poly(ethylene-co-methacrylic acid) and polytetrafluoroethylene were added to mixture A at room temperature and stirred for 1.5 h to obtain digital ink.

[0063] Furthermore, the first UV glue includes the following raw materials in parts by weight: 28 parts of a polymer of maleic rosin, p-tert-butylphenol, formaldehyde and pentaerythritol, 10 parts of a polymer of linseed oil, isophthalic acid and trimethylolpropane, 7 parts of soybean oil, 1.5 parts of lanolin, 1 part of a first photoinitiator and 1 part of polyethylene wax.

[0064] In this embodiment, the polymer of maleic rosin, p-tert-butylphenol, formaldehyde and pentaerythritol has a CAS number of 68082-96-2; the polymer of linseed oil, isophthalic acid and trimethylolpropane has a CAS number of 67700-81-6.

[0065] Furthermore, the first photoinitiator is photoinitiator 1173.

[0066] Furthermore, the preparation method of the first UV adhesive includes the following steps:

[0067] B1: At room temperature, maleic rosin, a polymer of p-tert-butylphenol, formaldehyde and pentaerythritol, a polymer of linseed oil, isophthalic acid and trimethylolpropane, and soybean oil were mixed and stirred for 1.5 hours to obtain a pre-made slurry;

[0068] B2: At room temperature, add lanolin, polyethylene wax and the first photoinitiator to the prefabricated slurry while stirring, and then stir for 12 minutes until uniform to obtain the first UV glue.

[0069] Furthermore, the second UV adhesive comprises the following raw materials in parts by weight: 40 parts of dipentaerythritol hexaacrylate, 22 parts of pentaerythritol triacrylate, 15 parts of trimethylolpropane triacrylate, 5 parts of acrylic acid, 3 parts of a second photoinitiator, and 1.5 parts of a polymerization inhibitor.

[0070] Furthermore, the second photoinitiator is formed by compounding photoinitiator 1173 and photoinitiator TPO in a weight ratio of 10:1.

[0071] Furthermore, the polymerization inhibitor is p-hydroxyanisole.

[0072] Furthermore, the preparation method of the second UV adhesive comprises the following steps: at room temperature, dipentaerythritol hexaacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, acrylic acid, a photoinitiator and an inhibitor are uniformly mixed to obtain a second UV adhesive.

[0073] Furthermore, the coating solution comprises the following raw materials in parts by weight: 20-30 parts of polyethyleneimine and 70-80 parts of water.

[0074] A method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0075] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate, and dry it at 100°C for 2 seconds to form a second coating liquid layer for standby use;

[0076] S2: Under infrared heat preservation at 100°C, apply digital ink under pressure on the upper surface of the second coating liquid layer, keep it at 100°C and dry it for 2 seconds to form a digital ink bottom layer for later use;

[0077] S3: Coating the coating liquid on the upper surface of the intermediate product at 100°C, maintaining the temperature at 100°C and drying for 2 seconds to form a first coating liquid layer for later use;

[0078] S4: Under infrared heat preservation at 100℃, apply digital ink on the upper surface of the first coating liquid layer under pressure, keep it at 100℃ and dry for 2s to form a digital ink surface layer to obtain an intermediate product for standby use

[0079] S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer, and place it under UV light for 2 seconds to cure to form a second protective layer for later use;

[0080] S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 2 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0081] Furthermore, in step S1, the power of the corona is 1000-1200W.

[0082] Furthermore, in steps S2 and S4, the pressure coating is performed by applying a pressure of 200 kg in a Carver press to press the corresponding thickness.

[0083] Furthermore, in steps S5 and S6, the conditions for ultraviolet lamp irradiation are: UV energy is 90J.

[0084] Example 2

[0085] In this embodiment, the acrylic copolymer is a styrene acrylic emulsion having a CAS number of 25085-34-1.

[0086] Furthermore, the preparation method of the digital ink comprises the following steps:

[0087] A1: At room temperature, the conductive liquid and the image oil are mixed evenly to obtain a mixture A;

[0088] A2: At room temperature, pigment, styrene acrylic emulsion and polytetrafluoroethylene were added to mixture A and stirred for 1.5 hours to obtain digital ink.

[0089] A method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0090] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 100°C, and keep drying at 100°C for 2 seconds to form a second coating liquid layer for standby use;

[0091] S2: Under infrared heat preservation at 105°C, apply digital ink on the upper surface of the second coating liquid layer under pressure, maintain at 105°C and dry for 2 seconds to form a digital ink bottom layer for standby use;

[0092] S3: Coating the coating liquid on the upper surface of the intermediate product at 100°C, maintaining the temperature at 100°C and drying for 2 seconds to form a first coating liquid layer for later use;

[0093] S4: Under infrared heat preservation at 105°C, apply digital ink on the upper surface of the first coating liquid layer under pressure, maintain 105°C and dry for 2s to form a digital ink surface layer to obtain an intermediate product for standby use

[0094] S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer, and place it under UV light for 2 seconds to cure to form a second protective layer for later use;

[0095] S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 2 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0096] Furthermore, in steps S2 and S4, the pressure coating is performed by applying a pressure of 200 kg in a Carver press to press the corresponding thickness.

[0097] The rest of the content of this embodiment is the same as that of embodiment 1.

[0098] Comparative Example 1

[0099] The difference between this comparative example and Example 1 is that the protective layer is not divided into a first protective layer and a second protective layer, the thickness of the protective layer is 4 μm, and the protective layer is formed by coating with a third UV adhesive.

[0100] Furthermore, the third UV glue is formed by compounding the first UV glue and the second UV glue in a molar ratio of 1:1.

[0101] That is, in this comparative example, a method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0102] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 100°C, and keep drying at 100°C for 2 seconds to form a second coating liquid layer for standby use;

[0103] S2: Under infrared heat preservation at 100°C, apply digital ink under pressure on the upper surface of the second coating liquid layer, keep it at 100°C and dry it for 2 seconds to form a digital ink bottom layer for later use;

[0104] S3: Coating the coating liquid on the upper surface of the intermediate product at 100°C, maintaining the temperature at 100°C and drying for 2 seconds to form a first coating liquid layer for later use;

[0105] S4: Under infrared heat preservation at 100℃, apply digital ink on the upper surface of the first coating liquid layer under pressure, keep it at 100℃ and dry for 2s to form a digital ink surface layer to obtain an intermediate product for standby use

[0106] S5: At room temperature, a third UV adhesive is applied to the upper surface of the digital ink layer, and the layer is cured under UV light for 4 seconds to form a third protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0107] Furthermore, in step S5, the condition of ultraviolet lamp irradiation is: UV energy is 90J.

[0108] Comparative Example 2

[0109] The difference between this comparative example and Example 2 is that the digital ink is formed by coating with digital ink of Colorsir / Kasef model D-1501 on the market.

[0110] A method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0111] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 100°C, and keep drying at 100°C for 2 seconds to form a second coating liquid layer for standby use;

[0112] S2: Under infrared heat preservation at 95°C, apply digital ink on the upper surface of the second coating liquid layer under pressure, maintain at 95°C and dry for 2 seconds to form a digital ink bottom layer for standby use;

[0113] S3: Coating the coating liquid on the upper surface of the intermediate product at 100°C, maintaining the temperature at 100°C and drying for 2 seconds to form a first coating liquid layer for later use;

[0114] S4: Under infrared heat preservation at 95℃, apply digital ink on the upper surface of the first coating liquid layer under pressure, maintain 95℃ and dry for 2s to form a digital ink surface layer, and obtain an intermediate product for standby use.

[0115] S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer, and place it under UV light for 2 seconds to cure to form a second protective layer for later use;

[0116] S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 2 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0117] Comparative Example 3

[0118] The difference between this comparative example and Example 1 is that the coating liquid used is Michelman DigiPrime model 74433 coating liquid available on the market.

[0119] A method for preparing the solvent-resistant and abrasion-resistant variable serial number environmentally friendly label comprises the following steps:

[0120] S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 105°C, and keep drying at 105°C for 2 seconds to form a second coating liquid layer for standby use;

[0121] S2: Under infrared heat preservation at 100°C, apply digital ink under pressure on the upper surface of the second coating liquid layer, keep it at 100°C and dry it for 2 seconds to form a digital ink bottom layer for later use;

[0122] S3: Coating the coating liquid on the upper surface of the intermediate product at 105°C, maintaining the temperature at 105°C for 2 seconds to form a first coating liquid layer for later use;

[0123] S4: Under infrared heat preservation at 100°C, apply digital ink on the upper surface of the first coating liquid layer under pressure, keep it at 100°C and dry for 2s to form a digital ink surface layer to obtain an intermediate product for standby use.

[0124] S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer, and place it under UV light for 2 seconds to cure to form a second protective layer for later use;

[0125] S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 2 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

[0126] Performance testing

[0127] Performance tests were conducted on the intermediate products produced in Examples 1-2 and Comparative Examples 1-3, as well as the solvent-resistant, abrasion-resistant, and variable-number eco-friendly labels. The solvent resistance of the solvent-resistant, abrasion-resistant, and variable-number eco-friendly labels and the wear resistance of their protective layers were tested. The intermediate products also tested their adhesion, specifically the bonding strength of the first coating liquid layer to the digital ink surface layer. The test data are shown in Table 1 below:

[0128] Table 1

[0129]

[0130]

[0131] The bond strength test uses the 3M tape test method: Place the intermediate product horizontally and completely adhere 3M600 tape to the surface of the digital ink in the intermediate product, eliminating any bubbles. Wait for 20 seconds, then pull the tape vertically 90 degrees and remove it within 1 second to check for any paint from the digital ink surface. Test the same location multiple times.

[0132] Abrasion Resistance Test: Solvent-resistant, abrasion-resistant, variable-number eco-friendly labels were cut into the shape specified in GB / T1768-2006 and placed on a TABER abrasion resistance tester (GT-7012-T). The surface changes of the digital ink layer were observed by friction. The grinding wheel type was CS-10, the speed was set to 42 r / min, and the surface load weight was 500g. Because the coating liquid is transparent and colorless, the exposed bottom surface mentioned in Table 1 refers to the exposed bottom surface, that is, the protective layer is worn, and the digital ink surface is visible.

[0133] Solvent resistance test: Prepare solvent-resistant and abrasion-resistant variable-number eco-friendly labels cut into 25mm*25mm. After drying, place the solvent-resistant and abrasion-resistant variable-number eco-friendly labels in toluene for 30 minutes and then take them out to observe whether there is any paint peeling off from the digital ink surface and / or the digital ink bottom layer, or whether the solvent-resistant and abrasion-resistant variable-number eco-friendly labels swell. If the paint peels off, it is unqualified; if there is obvious swelling but no peeling, it is good; if there is no obvious swelling or slight swelling, it is excellent.

[0134] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A solvent-resistant, abrasion-resistant, variable-number environmental label, characterized by: The invention comprises a protective layer, a digital ink surface layer, a first coating liquid layer, a digital ink bottom layer, a second coating liquid layer and a substrate arranged in sequence from top to bottom; the protective layer comprises a first protective layer and a second protective layer arranged at the lower end of the first protective layer; the digital ink surface layer and the digital ink bottom layer are both formed by coating digital ink, the first protective layer is formed by coating a first UV adhesive, the second protective layer is formed by coating a second UV adhesive, and the first coating liquid layer and the second coating liquid layer are both formed by coating a coating liquid; the digital ink comprises the following raw materials in parts by weight: 7-8 parts of pigment, 15-22 parts of acrylic copolymer, 11-15 parts of fluoropolymer resin, 20-45 parts of conductive liquid and 5-10 parts of image oil; the first UV adhesive The invention comprises the following raw materials in parts by weight: 25-30 parts of a polymer of maleic rosin, p-tert-butylphenol, formaldehyde and pentaerythritol, 8-11 parts of a polymer of linseed oil, isophthalic acid and trimethylolpropane, 6-8 parts of soybean oil, 1-2 parts of lanolin, 0.8-1.2 parts of a first photoinitiator and 0.8-1.2 parts of polyethylene wax; the second UV adhesive comprises the following raw materials in parts by weight: 30-50 parts of dipentaerythritol hexaacrylate, 20-25 parts of pentaerythritol triacrylate, 10-20 parts of trimethylolpropane triacrylate, 5-6 parts of acrylic acid, 2.5-10 parts of a photoinitiator and 1-2 parts of a polymerization inhibitor; and the coating solution comprises the following raw materials in parts by weight: 20-30 parts of polyethyleneimine and 70-80 parts of water.

2. The solvent-resistant and abrasion-resistant variable serial number environmentally friendly label according to claim 1, characterized in that: The preparation method of the digital ink comprises the following steps: A1: Mix the conductive liquid and the image oil evenly to obtain a mixture A; A2: Add pigment, acrylic copolymer and fluoropolymer resin to mixture A and stir for 1-3 hours to obtain digital ink.

3. The solvent-resistant and abrasion-resistant variable serial number environmentally friendly label according to claim 1, characterized in that: The preparation method of the first UV adhesive comprises the following steps: B1: At room temperature, maleic rosin, a polymer of p-tert-butylphenol, formaldehyde and pentaerythritol, a polymer of linseed oil, isophthalic acid and trimethylolpropane, and soybean oil are mixed and stirred for 1-3 hours to obtain a pre-made slurry; B2: At room temperature, add lanolin, polyethylene wax and the first photoinitiator to the prefabricated slurry while stirring, and then stir evenly to obtain the first UV adhesive.

4. The solvent-resistant and abrasion-resistant variable serial number environmentally friendly label according to claim 1, characterized in that: The preparation method of the second UV adhesive comprises the following steps: at room temperature, uniformly mixing dipentaerythritol hexaacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, acrylic acid, a second photoinitiator and a polymerization inhibitor to obtain a second UV adhesive.

5. A method for preparing the solvent-resistant, abrasion-resistant, variable-number eco-friendly label according to any one of claims 1 to 4, characterized in that: The steps include: S1: Take a substrate and a coating liquid, perform corona treatment on the upper surface of the substrate at room temperature, then evenly apply the coating liquid on the upper surface of the substrate at 80-110°C, and keep drying at 80-110°C for 1-3 seconds to form a second coating liquid layer for standby use; S2: Under infrared heat preservation at 80-110°C, apply digital ink on the upper surface of the second coating liquid layer under pressure, maintain 80-110°C and dry for 1-3 seconds to form a digital ink bottom layer, and set aside; S3: Coating the coating liquid on the upper surface of the intermediate product at a temperature of 80-110°C, maintaining the temperature at 80-110°C and drying for 1-3 seconds to form a first coating liquid layer for standby use; S4: Under infrared heat preservation at 80-110°C, apply digital ink on the upper surface of the first coating liquid layer under pressure, maintain 80-110°C and dry for 1-3 seconds to form a digital ink surface layer to obtain an intermediate product for standby use; S5: At room temperature, apply a second UV adhesive on the upper surface of the digital ink layer and place it under UV light for 0.5-3 seconds to cure to form a second protective layer for later use; S6: At room temperature, coating the upper surface of the second protective layer with a first UV adhesive, and curing the adhesive under UV light for 0.5-3 seconds to form a first protective layer, thereby obtaining a solvent-resistant, abrasion-resistant, and variable-number environmentally friendly label.

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