Water-based 3D visual touch synergistic coating for beer paper label and manufacturing and using methods thereof

Abstract

The invention discloses a water-based 3D visual touch synergistic coating for a beer paper label as well as a preparation method and a use method of the water-based 3D visual touch synergistic coating. The coating is prepared from the following components in parts by weight: 40 parts of water-based emulsion A, 8-20 parts of water-based emulsion B, 2.8-6 parts of a synergist, 0.2-0.4 part of an alkali swelling thickener and 0.2-1 part of other auxiliaries, the water-based emulsion A is one of pure acrylic emulsion, styrene-acrylic emulsion and vinyl acetate-acrylic emulsion with controllable rheology, and the molecular weight of the resin is 100,000-500,000; the acid value is less than or equal to 60mgKOH / g, Tg is less than or equal to 30 DEG C, and the solid content is 25 The water-based emulsion B is a low-acid-value alkali-resistant self-crosslinking acrylic emulsion, the content of acrylic acid is less than or equal to 0.5%, the molecular weight of resin is 20,000-500,000, the acid value is less than or equal to 20mgKOH / g, Tg is less than or equal to 30 DEG C, and the solid content is 30-35%; the synergist is prepared from 2.5 to 5 parts of hollow glass beads and 0.3 to 1 part of polypropylene wax powder. While the requirement for quick label removal of the beer paper label in alkali liquor bottle washing is met, good 3D light and touch effects are achieved, and the visual and touch effects of the beer paper label are improved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a water-based 3D visual-tactile enhancement coating for beer paper labels and a manufacturing method and a use method thereof. Background Art

[0002] In the field of beer packaging, paper labels play an important role in identification and decoration. As consumers' requirements for the aesthetics and tactile feel of product packaging continue to increase, traditional flat paper labels can no longer meet market demand. Paper labels with 3D tactile effects can bring consumers a unique visual and tactile experience, enhancing the appeal of products on shelves.

[0003] Among the common methods of label enhancement, printing enhancement treatment is often carried out with the help of varnish, ink, etc., in order to present various effects such as snowflakes, frosting, wrinkles, etc. However, this printing enhancement method has many disadvantages. On the one hand, it cannot meet the strict requirements of rapid label removal during alkali bottle washing during beer bottle recycling. This limitation greatly restricts its application scope; on the other hand, printing enhancement is difficult in the production process. For example, in the gravure printing process, the scraper is very likely to be severely worn, which leads to frequent scratches, and the color difference problem is also quite prominent.

[0004] In order to meet the requirements of rapid label removal of beer paper labels by washing bottles with alkaline solution, CN110438837A "A method for preparing ink-retaining aluminum-coated paper capable of rapid label removal" discloses adding a non-film-forming alkali-resistant resin to the primer component and the topcoat component, which is evenly dispersed in the coating. By using its non-film-forming principle, gaps or even cracks will appear on the coating surface, promoting the rapid penetration of alkaline water into the coating, achieving label removal and ink retention effects. This patent solution is only applicable to ordinary beer labels, which are prone to small cracks in appearance, affecting the appearance, and its coating lacks 3D light and tactile effects. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a water-based 3D visual and tactile enhancement coating for beer paper labels and a manufacturing and use method, which not only meets the requirements of rapid label removal by alkali bottle washing, but also has good 3D light and tactile effects, thereby enhancing the visual and tactile experience of beer paper labels.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] The water-based 3D visual tactile synergistic coating for beer paper labels is characterized by comprising, by weight: 40 parts of water-based emulsion A, 8-20 parts of water-based emulsion B, 2.8-6 parts of synergist, 0.2-0.4 parts of alkali swelling thickener, and 0.2-1 parts of other additives;

[0008] The aqueous emulsion A is one of a pure acrylic emulsion, a styrene acrylic emulsion, and a acetic acid acrylic emulsion with controllable rheology, with a resin molecular weight of 100,000-500,000; an acid value of ≤60 mgKOH / g, a Tg of ≤30°C, and a solid content of 25-30%;

[0009] The aqueous emulsion B is a low-acid value alkali-resistant self-crosslinking acrylic emulsion, with an acrylic acid content of ≤0.5%, a resin molecular weight of 200,000-500,000, an acid value of ≤20 mgKOH / g, a Tg of ≤30°C, and a solid content of 30-35%;

[0010] The synergist comprises 2.5-5 parts of hollow glass microspheres and 0.3-1 parts of polypropylene wax powder; the hollow glass microspheres are divided into 0.5-1 parts of medium-diameter hollow glass microspheres with a particle size of 30-80 um and 2-4 parts of low-diameter hollow glass microspheres with a particle size of 20-50 um.

[0011] Preferably, the aqueous emulsion A is a styrene-acrylic emulsion.

[0012] Preferably, the resin molecular weight of the aqueous emulsion A is 200,000-300,000, the acid value is 30-50 mgKOH / g, and the Tg is 10-15°C.

[0013] Preferably, the resin molecular weight of the aqueous emulsion B is 250,000-350,000, the acid value is less than 10 mgKOH / g, and the Tg is 20-30°C.

[0014] Preferably, the particle size of the medium-sized hollow glass microspheres is 45-60 um, the particle size of the low-sized hollow glass microspheres is 25-35 um, and the particle size of the polypropylene wax powder is 30-45 um.

[0015] Preferably, the density of the hollow glass microspheres is 2.4-2.6 g / cm3, and the density of the polypropylene wax powder is 0.96-0.98 g / cm 3 .

[0016] Preferably, the other additives include 0.03-0.05 parts of defoaming agent, 0.2-0.5 parts of anti-settling agent, and 0.05-0.1 parts of wetting and leveling agent.

[0017] Preferably, the coating has a 4-cup viscosity of 20-35 seconds.

[0018] The method for manufacturing a water-based 3D visual and tactile enhancement coating for beer paper labels is characterized by comprising the following steps:

[0019] S1: Weigh 40 parts of aqueous emulsion A and 8-20 parts of aqueous emulsion B, stir them at a low speed with a stirring dispersant, the stirring speed is 500-800 rpm, stir for 5-10 minutes, and obtain S1 emulsion after uniform mixing;

[0020] S2: add alkali swelling thickener to S1 emulsion, slowly and uniformly add it under stirring, stirring speed 800-1200 rpm, fully disperse the alkali swelling thickener, and obtain S2 emulsion with a viscosity range of 15-25s (apply 4 cups);

[0021] S3: Add synergist and other additives to S2 emulsion and increase the stirring speed to 1500-2500 rpm.

[0022] min, stirring until all the synergists are completely dispersed and there is no particle agglomeration, to obtain S3 slurry;

[0023] S4: Add other additives to the S3 slurry, stir at a speed of 1500-2500 rpm for 15-20 minutes, then switch to low-speed defoaming at a speed of 300-500 rpm for 20-30 minutes to ensure that the bubbles in the coating are completely released, and obtain a water-based 3D visual tactile synergistic coating for beer paper labels.

[0024] The method for using water-based 3D visual tactile enhancement coating for beer paper labels is characterized by: using an anilox roller for coating, and the thickness of the coating dry film layer is greater than or equal to 45um.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. While meeting the requirements of rapid label removal for bottle washing with alkali solution, it also has good 3D light and tactile effects

[0027] Effect, enhance the visual and tactile effects of beer paper labels;

[0028] 2. The paint is based on a water-based formula, which is environmentally friendly and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] none DETAILED DESCRIPTION

[0030] The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] The present invention is further described below with specific embodiments:

[0033] Water-based 3D visual tactile enhancement coating for beer paper labels, the components and parts by weight are as follows:

[0034] The parts by weight include:

[0035] Aqueous emulsion A: 40 parts;

[0036] Aqueous emulsion B: 8-20 parts;

[0037] Synergist: 2.8-6 parts;

[0038] Alkali swelling thickener: 0.2-0.4 parts;

[0039] Other additives: 0.2-1 part;

[0040] The aqueous emulsion A is one of a pure acrylic emulsion, a styrene acrylic emulsion, and a acetic acid acrylic emulsion with controllable rheology, with a resin molecular weight of 100,000-500,000; an acid value of ≤60 mgKOH / g, a Tg of ≤30°C, and a solid content of 25-30%;

[0041] The aqueous emulsion B is a low-acid value alkali-resistant self-crosslinking acrylic emulsion, with an acrylic acid content of ≤0.5%, a resin molecular weight of 200,000-500,000, an acid value of ≤20 mgKOH / g, a Tg of ≤30°C, and a solid content of 30-35%;

[0042] The synergist comprises 2.5-5 parts of hollow glass microspheres and 0.3-1 parts of polypropylene wax powder; the hollow glass microspheres are divided into 0.5-1 parts of medium-diameter hollow glass microspheres with a particle size of 30-80 um and 2-4 parts of low-diameter hollow glass microspheres with a particle size of 20-50 um.

[0043] In the formula of the present invention, the aqueous emulsion A can give the coating an extremely excellent leveling effect, good glossiness and excellent glue resistance. The coating formed by the coating of the present invention has a good barrier effect on beer paper label glue (aqueous casein glue, special for beer label), and can prevent the glue from penetrating from the back of the paper through the coating formed by the coating of the present invention, thereby preventing the ammonia component in the label glue from corroding and oxidizing the aluminum plating layer, and the reaction time for the special beer label glue is not less than 15 minutes.

[0044] The water-based emulsion B resin structure contains -OH structure, which enables the emulsion itself to undergo self-crosslinking reaction, and forms a highly dense film that is not easy to deform through the self-crosslinking ability of the emulsion. Water-based emulsion B is the key to controlling alkali penetration resistance. The carboxyl content in the emulsion is strictly controlled (acrylic acid content ≤ 0.5%), thereby reducing the active ingredients that react with NaOH (alkali penetration principle: NaOH+R-COOH=R-CONa+H2O). The higher the carboxyl content in the acrylic emulsion, the easier it is for the compactness of the coating film to be destroyed by NaOH alkali solution, and the worse the alkali resistance. At the same time, the coating formed by the coating of the present invention can meet the washable bottle requirements of beer single paper labels, specifically, the dry coating alkali penetration time is required to be between 30-120 seconds (test conditions: NaOH alkali solution with a content of 2-2.5%, soaked at 75-80°C).

[0045] The coating of the present invention, through the organic combination of aqueous emulsion A, aqueous emulsion B and alkali swelling thickener, can reduce the coating from polluting alkali solution and improve the bottle washing efficiency while meeting the requirement that the beer paper label bottle washing time does not exceed 180 seconds.

[0046] Hollow glass microbeads have good transparency and will not significantly affect the transparent effect of the coating after film formation. They can create obvious height differences for the coating, so that people can feel a significant 3D frosted touch when touching it.

[0047] Polypropylene wax powder (also known as sand powder, plastic sand powder) is a specially treated high molecular weight modified polymer in the form of white powder. It has excellent acid and alkali resistance, good dispersion characteristics in water-based emulsions, and is not prone to floating, precipitation, and whitening. It can give the coating a unique texture and feel as well as a unique visual effect.

[0048] Alkali swelling thickeners and other additives are purchased from commercially available commodities.

[0049] Furthermore, the aqueous emulsion A is a styrene acrylic emulsion.

[0050] Furthermore, the resin molecular weight of the aqueous emulsion A is 200,000-300,000, the acid value is 30-50 mgKOH / g, and the Tg is 10-15°C.

[0051] Furthermore, the resin molecular weight of the aqueous emulsion B is 250,000-350,000, the acid value is less than 10 mgKOH / g, and the Tg is 20-30°C.

[0052] Furthermore, the particle size of the medium-sized hollow glass microspheres is 45-60 um, the particle size of the low-sized hollow glass microspheres is 25-35 um, and the particle size of the polypropylene wax powder is 30-45 um.

[0053] Hollow glass beads have good transparency and will not significantly affect the transparent effect of the coating after molding. They can create obvious height differences for the coating, so that people can feel a significant 3D frosted touch when touching it.

[0054] Furthermore, the density of the hollow glass microspheres is 2.4-2.6 g / cm 3 The density of the polypropylene wax powder is 0.96-0.98 g / cm 3 .

[0055] The high-density hollow glass microbeads allow the coating to form a 3D shape and light effect after film formation, and the lower-density polypropylene wax powder forms a unique texture feel on the surface of the coating after film formation, thereby obtaining good 3D light effect and touch enhancement properties on the surface of the beer paper label.

[0056] Furthermore, the other additives include 0.03-0.05 parts of defoaming agent, 0.2-0.5 parts of anti-settling agent, and 0.05-0.1 parts of wetting and leveling agent.

[0057] The defoaming agent can be selected from one or a combination of modified polysiloxane, mineral oils, modified silicone compounds or surfactants.

[0058] Furthermore, the coating has a 4-cup coating viscosity of 20-35 seconds.

[0059] The method for manufacturing water-based 3D visual tactile enhancement coating for beer paper labels is as follows:

[0060] S1: Weigh 40 parts of aqueous emulsion A and 8-20 parts of aqueous emulsion B, stir them at a low speed with a stirring dispersant, the stirring speed is 500-800 rpm, stir for 5-10 minutes, and obtain S1 emulsion after uniform mixing.

[0061] S2: Add alkali swelling thickener to S1 emulsion, slowly and evenly add it under stirring, stirring speed 800-1200 rpm, stir for 15-20 minutes to fully disperse the alkali swelling thickener, and obtain S2 emulsion with a viscosity range of 15-25s (apply 4 cups).

[0062] This step mainly controls the viscosity of the emulsion to facilitate the subsequent dispersion of the synergist, and at the same time plays a critical role in inhibiting the sedimentation of the synergist.

[0063] S3: Slowly add synergists (hollow glass microbeads, polypropylene wax powder) and other additives (leveling agent, defoaming agent) to the S2 emulsion, increase the stirring speed to 1500-2500 rpm, and stir until all synergists are completely dispersed and there is no particle agglomeration to obtain S3 slurry.

[0064] S4: Add other additives (anti-settling agents) to the S3 slurry, stir at a speed of 1500-2500 rpm for 15-20 minutes, then switch to low-speed defoaming at a speed of 300-500 rpm for 20-30 minutes to ensure that the bubbles in the coating are completely released, and obtain a water-based 3D visual tactile synergistic coating for beer paper labels with a viscosity of 20-35 seconds (apply 4 cups).

[0065] Finished coating performance test, test items include viscosity, solid content, scraping effect, alkali penetration, touch effect and dry coating brightness and other indicators. When the viscosity of the finished coating is in the range of 20-35 seconds (coating 4 cups), it can well meet the requirements of machine coating. When the viscosity is too low, it is easy to cause the problem of rapid sedimentation of hollow glass beads; when the viscosity is too high, it will cause the coating texture to be significantly substandard, seriously affecting the product quality.

[0066] The coating prepared by the above process is scraped on the paper surface with the help of RDS15# wire rod. After drying, the coating presents a bright appearance, has a very obvious three-dimensional sand feeling when touched by hand, and exhibits a unique flashing effect when observed at different angles. At the same time, the coating of the present invention can fully meet the washable bottle requirements of beer single paper labels, that is, the alkali penetration time of the dry coating is between 30-120 seconds (test conditions are 75-80℃, 2-2.5% NaOH), and the reaction time of the special labeling glue for beer labels is not less than 15 minutes.

[0067] The method of using water-based 3D visual tactile enhancement coating for beer paper labels is to use an anilox roller for coating, the anilox roller mesh depth is 45-70um, and the coating dry film thickness is greater than or equal to 45um.

[0068] The thickness of the film layer has a certain influence on the 3D touch. If the film layer is too thin, the 3D touch effect will be poor.

[0069] This patented coating can meet the requirements of rapid label removal of beer paper labels during bottle washing with alkali solution, and has a very obvious 3D matte texture and light effect, with unique visual and tactile effects. It also has alkali permeability, good alkali impregnation resistance, and excellent bonding strength with the aluminum coating (vacuum aluminum coating on the coating). Moreover, the coating can be roll-coated using anilox rollers, and its coating uniformity far exceeds that of printing, and the sandy effect is also more outstanding. In addition, the coating is a water-based system, so it can properly solve the pollution problems caused by gravure solvent inks, provide strong support for the emission reduction goals of green packaging, and actively promote the packaging industry to develop in a more environmentally friendly and sustainable direction.

[0070] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the patent claims of the present invention.

Claims

1. Water-based 3D visual and tactile synergistic coating for beer paper labels, characterized in that: The composition includes, by weight: aqueous emulsion A: 40 parts, aqueous emulsion B: 8-20 parts, synergist: 2.8-6 parts, alkali swelling thickener: 0.2-0.4 parts, other additives: 0.2-1 parts; The aqueous emulsion A is one of a pure acrylic emulsion, a styrene acrylic emulsion, and a acetic acid acrylic emulsion with controllable rheology, with a resin molecular weight of 100,000-500,000; an acid value of ≤60 mgKOH / g, a Tg of ≤30°C, and a solid content of 25-30%; The aqueous emulsion B is a low-acid value alkali-resistant self-crosslinking acrylic emulsion, with an acrylic acid content of ≤0.5%, a resin molecular weight of 200,000-500,000, an acid value of ≤20 mgKOH / g, a Tg of ≤30°C, and a solid content of 30-35%; The synergist comprises 2.5-5 parts of hollow glass microspheres and 0.3-1 parts of polypropylene wax powder; the hollow glass microspheres are divided into 0.5-1 parts of medium-diameter hollow glass microspheres with a particle size of 30-80 um and 2-4 parts of low-diameter hollow glass microspheres with a particle size of 20-50 um.

2. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The aqueous emulsion A is a styrene acrylic emulsion.

3. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The resin molecular weight of the aqueous emulsion A is 200,000-300,000, the acid value is 30-50 mgKOH / g, and the Tg is 10-15°C.

4. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The resin molecular weight of the aqueous emulsion B is 250,000-350,000, the acid value is less than 10 mgKOH / g, and the Tg is 20-30°C.

5. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The particle size of the medium-sized hollow glass microspheres is 45-60 um, the particle size of the low-sized hollow glass microspheres is 25-35 um, and the particle size of the polypropylene wax powder is 30-45 um.

6. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The density of the hollow glass microspheres is 2.4-2.6 g / cm3, and the density of the polypropylene wax powder is 0.96-0.98 g / cm 3 .

7. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The other additives include 0.03-0.05 parts of defoaming agent, 0.2-0.5 parts of anti-settling agent, and 0.05-0.1 parts of wetting and leveling agent.

8. The water-based 3D visual and tactile enhancement coating for beer paper labels according to claim 1, characterized in that: The coating has a viscosity of 20-35 seconds for 4 cups of coating.

9. A coating manufacturing method for manufacturing a water-based 3D visual and tactile enhancement coating for beer paper labels as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Weigh 40 parts of aqueous emulsion A and 8-20 parts of aqueous emulsion B, stir them at a low speed with a stirring dispersant, the stirring speed is 500-800 rpm, stir for 5-10 minutes, and obtain S1 emulsion after uniform mixing; S2: add alkali swelling thickener to S1 emulsion, slowly and uniformly add it under stirring, stirring speed 800-1200 rpm, fully disperse the alkali swelling thickener, and obtain S2 emulsion with a viscosity range of 15-25s (apply 4 cups); S3: Add synergists and other additives to the S2 emulsion, increase the stirring speed to 1500-2500 rpm, and stir until all synergists are completely dispersed and there is no particle agglomeration to obtain S3 slurry; S4: Add other additives to the S3 slurry, stir at a speed of 1500-2500 rpm for 15-20 minutes, then switch to low-speed defoaming at a speed of 300-500 rpm for 20-30 minutes to ensure that the bubbles in the coating are completely released, and obtain a water-based 3D visual tactile synergistic coating for beer paper labels.

10. A coating use method for coating the water-based 3D visual and tactile enhancement coating for beer paper labels as claimed in any one of claims 1 to 8, characterized in that: The coating is applied by an anilox roller, and the thickness of the coating dry film layer is greater than or equal to 45 um.