Transfer adhesive composition for aluminum layer transfer and preparation process
By preparing a transfer adhesive composition comprising waterborne acrylic-modified epoxy resin and imidazole-blocked waterborne polyurethane dispersion, the problems of adhesion and folding endurance of metallized transfer paper during aluminum layer transfer process were solved, achieving improved adhesion, folding endurance and gloss, and possessing anti-reflective properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGXI ZHEWEI NEW MATERIALS TECH CO LTD
- Filing Date
- 2026-03-04
- Publication Date
- 2026-06-05
AI Technical Summary
Existing aluminized transfer adhesives suffer from problems such as poor adhesion, peeling of aluminum foil from paper, poor folding resistance, and complex coating processes during the aluminum layer transfer process, resulting in unstable performance of environmentally friendly packaging materials.
A transfer adhesive composition for aluminum layer transfer printing was prepared by using a specific ratio of waterborne acrylic modified epoxy resin, imidazole blocked waterborne polyurethane dispersion, defoamer and additives, and by controlling the dispersion process and pretreatment of the imidazole blocked waterborne polyurethane dispersion.
It improves the stability and adhesion of the adhesive, enhances the folding endurance and gloss of the paper, improves the tensile strength of the transferred pattern, and has anti-glare capability, thus solving the performance defects in the existing technology.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of adhesives, and more specifically to a transfer adhesive composition and preparation process for aluminum layer transfer printing. Background Technology
[0002] Currently, most gold and silver cardboard used for packaging cigarettes, food, cosmetics, and gifts is made by directly laminating aluminum foil or aluminized plastic film onto the cardboard. The aluminum foil or plastic film on the surface of the cardboard cannot be directly recycled, creating environmental pressure. In recent years, aluminized transfer paper has been widely used as a new type of environmentally friendly packaging material. The main uses of aluminized transfer paper include aluminized transfer beer labels, aluminized transfer cigarette liners, aluminized transfer packaging cardboard, and aluminized transfer food packaging paper. It utilizes the peelability of the aluminized transfer layer to transfer aluminum layers with various aesthetic effects, vapor-deposited on a plastic film, onto the paper using adhesives, forming paper with various aesthetically pleasing effects.
[0003] Existing metallized transfer adhesives have certain defects in product performance and coating processes. Some have poor adhesion, causing the aluminum foil to peel off from the paper during use, or the aluminum layer to detach during the next processing step; some transfer paper has poor folding resistance and is prone to breakage; some have complex coating processes, are inconvenient to use, easily lead to waste, or have poor compatibility with coating laminating machines, causing sticking to the rollers during application. To avoid these problems, some companies use physical mixing methods to prepare modified latexes, but this can easily lead to phase separation, emulsion instability, and other performance defects. Summary of the Invention
[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a transfer adhesive composition and preparation process for aluminum layer transfer printing.
[0005] The technical solution of the present invention is as follows: A transfer adhesive composition for aluminum layer transfer printing comprises the following raw materials in parts by weight: 200-500 parts of waterborne acrylic modified epoxy resin, 0.2-5 parts of alkyl polyoxyethylene ether, 100-500 parts of imidazole blocked waterborne polyurethane dispersion, 0.2-0.25 parts of defoamer, and 0.1-0.9 parts of additives.
[0006] Preferably, the defoamer is an organosilicone defoamer.
[0007] Preferably, the additives include at least one of leveling agents and wetting agents.
[0008] Preferably, the leveling agent comprises polyether-modified polydimethylsiloxane; The wetting agent includes polyoxyethylene fatty alcohol ether.
[0009] The present invention also provides a preparation process for a transfer adhesive composition for aluminum layer transfer printing. In this process, 200-500 parts of acrylic-modified waterborne epoxy resin and OP-10 (alkylphenol polyoxyethylene ether) are first dispersed at 10-30°C. Then, 100-500 parts of imidazole-blocked waterborne polyurethane dispersion and defoamer are added for a second dispersion. Finally, additives are added, and the mixture is dispersed evenly to obtain the finished product.
[0010] Preferably, the first dispersion time is 10-20 min; the second dispersion time is 20-30 min.
[0011] Preferably, the first dispersion and the second dispersion are performed using the following methods: First, ultrasound was performed at 20-30℃, and then at 15-20℃; the ultrasound frequency was 30-40kHz.
[0012] Preferably, the imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: Add the composite solution to the imidazole-blocked aqueous polyurethane dispersion and neutralize it within the pH range of 7.5-9; The compound solution is a mixture of dimethylolpropionic acid and triethylamine.
[0013] Preferably, the mass ratio of dimethylolpropionic acid to triethylamine is 1:1-3.
[0014] The beneficial effects of this invention are: This invention, by controlling the dispersion process and pretreating the imidazole-blocked waterborne polyurethane dispersion, can maintain phase separation for 12 months at 40°C, greatly improving the stability of the adhesive. It also has excellent properties such as high adhesion, folding resistance, and high gloss, improves the tensile strength of the transferred pattern, and has anti-reflective properties. Detailed Implementation
[0015] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.
[0016] All fractions below are by weight.
[0017] Example 1 A process for preparing a transfer adhesive composition for aluminum layer transfer printing involves first dispersing 300 parts of acrylic-modified waterborne epoxy resin and 0.3 parts of alkylphenol polyoxyethylene ether at 25°C, then adding 300 parts of imidazole-blocked waterborne polyurethane dispersion and 0.2 parts of defoamer (BYK-025) for a second dispersion; finally adding 0.1 parts of leveling agent (BYK-33) and 0.3 parts of wetting agent (HYDRAPOL RP50), and dispersing evenly to obtain the finished product.
[0018] The first dispersion time was 10 minutes; the second dispersion time was 20 minutes.
[0019] The first dispersion was carried out using the following method: First, sonicate at 20℃ for 5 minutes, then sonicate at 15℃ for 5 minutes; the sonication frequency was 35kHz.
[0020] The second dispersion is performed using the following method: First, sonicate at 25℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0021] The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: A composite solution was added to the imidazole-blocked aqueous polyurethane dispersion and neutralized within a pH range of 8; the composite solution consisted of a mixture of dimethylolpropionic acid and triethylamine in a mass ratio of 1:1.
[0022] Example 2 A process for preparing a transfer adhesive composition for aluminum layer transfer printing involves first dispersing 300 parts of acrylic-modified waterborne epoxy resin and 0.3 parts of alkylphenol polyoxyethylene ether at 25°C, then adding 300 parts of imidazole-blocked waterborne polyurethane dispersion and 0.2 parts of defoamer (BYK-025) for a second dispersion; finally adding 0.1 parts of leveling agent (BYK-33) and 0.3 parts of wetting agent (HYDRAPOL RP50), and dispersing evenly to obtain the finished product.
[0023] The first dispersion time was 15 minutes; the second dispersion time was 25 minutes.
[0024] The first dispersion was carried out using the following method: First, sonicate at 20℃ for 5 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0025] The second dispersion is performed using the following method: First, sonicate at 25℃ for 10 minutes, then sonicate at 15℃ for 15 minutes; the sonication frequency was 35kHz.
[0026] The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: A composite solution was added to the imidazole-blocked aqueous polyurethane dispersion and neutralized within a pH range of 8; the composite solution consisted of a mixture of dimethylolpropionic acid and triethylamine in a mass ratio of 1:1.
[0027] Example 3 A process for preparing a transfer adhesive composition for aluminum layer transfer printing involves first dispersing 300 parts of acrylic-modified waterborne epoxy resin and 0.3 parts of alkylphenol polyoxyethylene ether at 25°C, then adding 300 parts of imidazole-blocked waterborne polyurethane dispersion and 0.2 parts of defoamer (BYK-025) for a second dispersion; finally adding 0.1 parts of leveling agent (BYK-33) and 0.3 parts of wetting agent (HYDRAPOL RP50), and dispersing evenly to obtain the finished product.
[0028] The first dispersion time is 20 minutes; the second dispersion time is 20 minutes.
[0029] The first dispersion was carried out using the following method: First, sonicate at 20℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0030] The second dispersion is performed using the following method: First, sonicate at 25℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0031] The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: A composite solution was added to the imidazole-blocked aqueous polyurethane dispersion and neutralized within a pH range of 8; the composite solution consisted of a mixture of dimethylolpropionic acid and triethylamine in a mass ratio of 1:1.
[0032] Example 4 A process for preparing a transfer adhesive composition for aluminum layer transfer printing involves first dispersing 300 parts of acrylic-modified waterborne epoxy resin and 0.3 parts of alkylphenol polyoxyethylene ether at 25°C, then adding 300 parts of imidazole-blocked waterborne polyurethane dispersion and 0.2 parts of defoamer (BYK-025) for a second dispersion; finally adding 0.1 parts of leveling agent (BYK-33) and 0.3 parts of wetting agent (HYDRAPOL RP50), and dispersing evenly to obtain the finished product.
[0033] The first dispersion time is 20 minutes; the second dispersion time is 20 minutes.
[0034] The first dispersion was carried out using the following method: First, sonicate at 20℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0035] The second dispersion is performed using the following method: First, sonicate at 25℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0036] The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: A composite solution was added to the imidazole-blocked aqueous polyurethane dispersion and neutralized within a pH range of 8; the composite solution consisted of a mixture of dimethylolpropionic acid and triethylamine in a mass ratio of 1:2.
[0037] Example 5 A process for preparing a transfer adhesive composition for aluminum layer transfer printing involves first dispersing 300 parts of acrylic-modified waterborne epoxy resin and 0.3 parts of alkylphenol polyoxyethylene ether at 25°C, then adding 300 parts of imidazole-blocked waterborne polyurethane dispersion and 0.2 parts of defoamer (BYK-025) for a second dispersion; finally adding 0.1 parts of leveling agent (BYK-33) and 0.3 parts of wetting agent (HYDRAPOL RP50), and dispersing evenly to obtain the finished product.
[0038] The first dispersion time is 20 minutes; the second dispersion time is 20 minutes.
[0039] The first dispersion was carried out using the following method: First, sonicate at 20℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0040] The second dispersion is performed using the following method: First, sonicate at 25℃ for 10 minutes, then sonicate at 15℃ for 10 minutes; the sonication frequency was 35kHz.
[0041] The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: A composite solution was added to the imidazole-blocked aqueous polyurethane dispersion and neutralized within a pH range of 8; the composite solution consisted of a mixture of dimethylolpropionic acid and triethylamine in a mass ratio of 1:3.
[0042] Comparative Example 1 Unlike Example 2, the first dispersion time was 15 min; the second dispersion time was 25 min. The dispersion temperature was 20°C, the ultrasonic frequency was 35 kHz, and the rest remained unchanged.
[0043] Comparative Example 2 Unlike Example 2, the imidazole-blocked aqueous polyurethane dispersion was not pretreated, and all other aspects remained unchanged.
[0044] The transfer adhesives from the above examples and comparative examples were applied to white cardboard using a coating method such as a screen roller or doctor blade, and then laminated with a PET metallized film. The laminated film was then unsealed at 70°C for 5-10 seconds and cured at 130°C for 35 seconds to obtain the transferred finished product. Its adhesion, folding endurance, gloss, and anti-reflection properties were tested. The test results are shown in Table 1.
[0045] (1) Stability: Observe and record whether the emulsion separates into layers at 40℃ for 12 months.
[0046] (2) Adhesion: Refer to GB / T2791-1995.
[0047] (3) Folding resistance: The MIT folding resistance tester (vertical, 135° bending angle, 175 times / min) was used to observe whether there was any peeling or exposure of the bottom after 175 folds.
[0048] (4) Gloss: GB / T 8807-1988 (incident angle 45°).
[0049] (5) Anti-reflection property: Take 10 layers of transfer film, stack them, and apply pressure (e.g., 1 kg / cm²). 2 (24h) Observe whether adhesion, transfer layer migration or local gloss decay occurs on the contact surface.
[0050] Table 1 Performance test results of the examples and comparative examples
[0051] As can be seen from the table above, the performance of the embodiments is better than that of the comparative examples. The main reason may be that the embodiments, by controlling the dispersion process and pretreating the imidazole-blocked waterborne polyurethane dispersion, maintain it at 40°C for 12 months without phase separation, which greatly improves the stability of the adhesive and gives it excellent properties such as high adhesion, folding resistance, and high gloss. It also improves the tensile strength of the transferred pattern and has anti-reflective properties.
[0052] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of the present invention.
Claims
1. A transfer adhesive composition for aluminum layer transfer printing, characterized in that, The ingredients include the following parts by weight: 200-500 parts of waterborne acrylic modified epoxy resin, 0.2-5 parts of alkyl polyoxyethylene ether, 100-500 parts of imidazole blocked waterborne polyurethane dispersion, 0.2-0.25 parts of defoamer, and 0.1-0.9 parts of additives.
2. The transfer adhesive composition for aluminum layer transfer printing according to claim 1, characterized in that, The defoamer used is an organosilicone defoamer.
3. The transfer adhesive composition for aluminum layer transfer printing according to claim 1, characterized in that, The additives include at least one leveling agent and a wetting agent.
4. The transfer adhesive composition for aluminum layer transfer printing according to claim 1, characterized in that, The leveling agent includes polyether-modified polydimethylsiloxane; The wetting agent includes polyoxyethylene fatty alcohol ether.
5. A process for preparing a transfer adhesive composition for aluminum layer transfer printing, characterized in that, At 10-30℃, 200-500 parts of acrylic-modified waterborne epoxy resin and alkylphenol polyoxyethylene ether are first dispersed, then 100-500 parts of imidazole blocked waterborne polyurethane dispersion and defoamer are added for a second dispersion; finally, additives are added and the product is obtained after uniform dispersion.
6. The preparation process of the transfer adhesive composition for aluminum layer transfer printing according to claim 5, characterized in that, The first dispersion time is 10-20 minutes; the second dispersion time is 20-30 minutes.
7. The preparation process of the transfer adhesive composition for aluminum layer transfer printing according to claim 5, characterized in that, The first and second dispersions are performed using the following methods: First, ultrasound was performed at 20-30℃, and then at 15-20℃; the ultrasound frequency was 30-40kHz.
8. The preparation process of the transfer adhesive composition for aluminum layer transfer printing according to claim 5, characterized in that, The imidazole-blocked aqueous polyurethane dispersion undergoes the following pretreatment: Add the composite solution to the imidazole-blocked aqueous polyurethane dispersion and neutralize it within the pH range of 7.5-9; The compound solution is a mixture of dimethylolpropionic acid and triethylamine.
9. The preparation process of a transfer adhesive composition for aluminum layer transfer printing according to claim 8, characterized in that, The mass ratio of dimethylolpropionic acid to triethylamine is 1:1-3.