Highlight paper as well as preparation method and application thereof

Abstract

The invention provides high-gloss paper as well as a preparation method and application thereof. The preparation method of the high-gloss paper comprises the following steps: S1, coating the surface of the paper subjected to corona treatment with a high-gloss coating, and heating or drying to cure the high-gloss coating to generate a high-gloss film; and S2, coating the surface of the paper subjected to corona treatment with an adhesive, then hot-pressing and covering a highlight film, and cooling and sizing to obtain the highlight paper. According to the method, firstly, paper is pretreated, the roughness and activity of the surface of the paper are improved through corona treatment, the adsorption capacity of the paper to a film covering material is improved, then the film covering material and the paper are attached through a hot-pressing film covering technology, in the hot-pressing process, an adhesive is rapidly cured, and a film layer is tightly attached to the surface of the paper; and then cooling and sizing are carried out, the paper temperature is rapidly reduced, and the stability and glossiness curing of a film layer are ensured.

Description

Technical Field

[0001] The present invention relates to a high-gloss paper, a preparation method thereof, and an application of a high-gloss paper. Background Art

[0002] At present, high-gloss papers are widely used in the fields of decoration, packaging, frames, etc. There are many problems in the conventional high-gloss frame paper laminating process. For example, the gloss of the paper after applying the high-gloss coating is uneven, which affects the aesthetics. Therefore, in the prior art, a high-gloss coating that can be applied is designed to obtain a paper with uniform gloss.

[0003] Taking the Chinese patent CN109183500A as an example, the high-gloss coating includes the following components by mass percentage: kaolin + titanium dioxide 30%-50%, polysiloxane 10%-20%, polyacrylamide 10%-30%, nanocellulose + polyvinyl alcohol 5%-10%, defoamer 0.1%-0.5%, and other auxiliaries 14%-44.9%. The high-gloss coating of this patent can be directly applied to the surface of the paper sheet to make the gloss of the paper uniform. Although this coating can achieve uniform gloss, its adhesion is poor, which easily causes the coating to fall off.

[0004] Therefore, it is necessary to develop a new scheme for preparing high-gloss paper to improve the adhesion between the paper and the high-gloss coating. Summary of the Invention

[0005] The present invention aims to solve the problem of poor adhesion of the high-gloss coating to the paper in the prior art, and provides a high-gloss paper, a preparation method thereof, and an application.

[0006] The technical method of the present invention is as follows:

[0007] A preparation method of a high-gloss paper, the preparation method comprising: S1, coating a high-gloss coating on the surface of the corona-treated paper, heating or drying to cure the high-gloss coating to form a high-gloss film; S2, coating an adhesive on the surface of the corona-treated paper, and then hot-pressing and laminating the high-gloss film, and cooling and shaping to obtain the high-gloss paper.

[0008] Preferably, the high-gloss coating is composed of the following components:

[0009]

[0010]

[0011] Preferably, the high-gloss coating is obtained by mixing high-gloss varnish, non-film-forming acrylate copolymer, film-forming acrylate copolymer, polyethylene, polyethylene wax, sodium dodecyl sulfate, triethanolamine, sodium dioctyl sulfosuccinate, hydroxyl-terminated polydimethylsiloxane, ethanol, and water.

[0012] Preferably, the time of the corona treatment is 1 - 100 seconds, and the frequency of the corona treatment is 20 - 40 kHz.

[0013] Preferably, in the hot - pressed high - gloss film, the pressure is 14 10 -18 10 N, the temperature is 70 - 90 °C, and the time of the hot pressing is 10 - 20 seconds.

[0014] Preferably, the cooling is carried out by air cooling and / or water cooling. Among them, air cooling uses a fan and / or an air conditioner. For example, when using a fan, the wind speed of the fan is 5 - 15 m / s.

[0015] Preferably, the adhesive is an acrylic emulsion.

[0016] The present invention also provides a high - gloss paper, which is prepared by the above - mentioned preparation method of the high - gloss paper.

[0017] The present invention also provides an application of the high - gloss paper, and the high - gloss paper is used on a frame.

[0018] The beneficial effects of the present invention are as follows:

[0019] First, the invention adopts a film - covering transfer process: First, the paper is pretreated. The corona treatment is carried out to increase the roughness and activity of the paper surface, improve its adsorption ability to the film - covering material. Then, the hot - pressed film - covering technology is used to bond the film - covering material to the paper. During the hot - pressing process, the adhesive quickly solidifies, making the film layer tightly adhere to the paper surface. Then, cooling and shaping are carried out to quickly reduce the temperature of the paper, ensuring the stability of the film layer and the solidification of the gloss.

[0020] Second, the high - gloss coating of the present invention includes high - gloss varnish, non - film - forming acrylate copolymer, film - forming acrylate copolymer, polyethylene, polyethylene wax, sodium dodecyl sulfate, triethanolamine, sodium dioctyl sulfosuccinate, hydroxyl - terminated polydimethylsiloxane, ethanol and water. Through the synergistic effect of each component, the gloss of the high - gloss coating is effectively improved. Compared with the gloss of the white card in the prior art within the range of 20 - 30 gloss units, the gloss of the high - gloss paper of the present invention can reach 60 - 90 gloss units, which is significantly increased by 3 - 4 times.

[0021] Third, the use of the high - gloss coating in the present invention can reduce costs, improve production efficiency, and conform to the industrial development trend of energy conservation, environmental protection and high - efficiency production.

[0022] Fourth, the adhesive of the present invention is an acrylic emulsion. Because of its good adhesion, it can adhere well to the surface of the paper, making the high - gloss coating firmly adhere to the paper; because of its good flexibility, when bent or stretched by an external force, it can deform accordingly and is not easily broken, which improves the service life of the high - gloss paper.

[0023] 5. The high-gloss paper of the present invention has a wide range of applications and can be used on items such as frames, decorative articles, and packaging boxes. Detailed Embodiment

[0024] The technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The present invention provides a method for preparing high-gloss paper, and the preparation method includes: S1. Coating a high-gloss coating on the surface of corona-treated paper, heating or drying to cure the high-gloss coating to form a high-gloss film; S2. Coating an adhesive on the surface of corona-treated paper, and then hot-pressing and laminating the high-gloss film, and cooling and shaping to obtain high-gloss paper.

[0026] In step S1:

[0027] In one embodiment, the high-gloss coating is composed of the following components: 30-55 parts by mass of high-gloss varnish, 25-40 parts by mass of non-film-forming acrylate copolymer, 1-5 parts by mass of film-forming acrylate copolymer, 1-5 parts by mass of polyethylene, 1-5 parts by mass of polyethylene wax, 0-1 part by mass of sodium dodecyl sulfate, 0-2 parts by mass of triethanolamine, 0-1 part by mass of sodium dioctyl sulfosuccinate, 0-1 part by mass of hydroxyl-terminated polydimethylsiloxane, 10-20 parts by mass of ethanol, and 10-20 parts by mass of water.

[0028] In one embodiment, the high-gloss varnish can improve the gloss of the product, make the surface of the product present a bright and smooth effect, and at the same time can also play a protective role to prevent the erosion of external factors on the surface of the product.

[0029] Specifically, within the range of 30-55 parts by mass of the high-gloss varnish, sufficient varnish can be ensured to form a good high-gloss effect. For example, the high-gloss varnish can be 35 parts by mass, 40 parts by mass, 45 parts by mass, or 50 parts by mass. When the high-gloss varnish is less than 30 parts by mass, the glossiness will be insufficient. When the high-gloss varnish is higher than 55 parts by mass, the cost will increase and other properties will be affected. For example, the drying time will be too long and the adhesion will decrease.

[0030] In one embodiment, the non-film-forming acrylate copolymer can improve the flexibility, adhesiveness, and pigment dispersibility of the product, etc., enable the product to better adhere to the surface of the object during application, and help improve the stability and storage performance of the product.

[0031] Specifically, the non-film-forming acrylate copolymer within the range of 25 - 40 parts by mass can ensure the properties such as flexibility and adhesiveness of the product. For example, the non-film-forming acrylate copolymer can be 30 parts by mass, 35 parts by mass, or 40 parts by mass. When the non-film-forming acrylate copolymer is less than 25 parts by mass, it will lead to insufficient flexibility and adhesiveness of the product. When the non-film-forming acrylate copolymer is more than 40 parts by mass, the product will be too soft and lack hardness, affecting its service performance.

[0032] In one embodiment, the film-forming acrylate copolymer can form a continuous film during the drying or curing process of the product, providing good adhesion, water resistance, chemical resistance, etc., while enhancing the protective performance of the product.

[0033] Specifically, the film-forming acrylate copolymer within the range of 1 - 5 parts by mass can effectively improve the film-forming performance and protective performance of the product. For example, the film-forming acrylate copolymer can be 2 parts by mass, 3 parts by mass, or 4 parts by mass. When the film-forming acrylate copolymer is less than 1 part by mass, the film-forming effect will be poor and the protective performance will be weak. When the film-forming acrylate copolymer is more than 5 parts by mass, it will cause an increase in the cost of the product and at the same time lead to a decrease in the flexibility of the product, resulting in problems such as cracking.

[0034] In one embodiment, polyethylene can enhance the toughness, water resistance, and impact resistance of the product, while helping to improve the processing performance of the product, making the product easier to operate during production and use.

[0035] Specifically, when polyethylene is within the range of 1 - 5 parts by mass, it can effectively improve the toughness and water resistance of the product without affecting other properties. For example, polyethylene can be 2 parts by mass, 3 parts by mass, or 4 parts by mass. When polyethylene is less than 1 part by mass, the improvement in performance is not obvious. When polyethylene is more than 5 parts by mass, it will affect the gloss and drying speed of the product, and may also reduce the adhesiveness of the product, affecting the adhesion.

[0036] In one embodiment, polyethylene wax mainly plays the roles of lubrication and anti-sticking, can reduce the friction coefficient during the processing of the product, making the product easier to coat and form, and at the same time can also improve the surface smoothness and wear resistance of the product.

[0037] Specifically, polyethylene wax within the range of 1 - 5 parts by mass can ensure good lubrication and anti-sticking effects while not having an adverse impact on other properties of the product. For example, polyethylene wax can be 2 parts by mass, 3 parts by mass, or 4 parts by mass. When polyethylene wax is less than 1 part by mass, the lubrication and anti-sticking effects are not obvious. When polyethylene wax is more than 5 parts by mass, it may lead to a decrease in the adhesiveness of the product and may form wax spots on the surface, affecting the appearance.

[0038] In one embodiment, sodium dodecyl sulfate is a surfactant that has functions such as emulsification, dispersion, and foaming. It can make each component mix more evenly, improving the stability and uniformity of the product.

[0039] Specifically, within the range of 0 - 1 part by mass of sodium dodecyl sulfate, it can play a good role in emulsification and dispersion. For example, the sodium dodecyl sulfate can be 0.1 part by mass, 0.5 part by mass, or 0.9 part by mass. When the mass part of sodium dodecyl sulfate is higher than 1 part by mass, it may generate excessive foam, affecting the use and storage of the product, and may also have a negative impact on the performance of the product, such as reducing the adhesion.

[0040] In one embodiment, triethanolamine can be used as a pH regulator to adjust the acidity and alkalinity of the product, making the product within a stable pH range. At the same time, it can also play a certain neutralizing role, improving the storage stability of the product.

[0041] Specifically, within the range of 0 - 2 parts by mass of triethanolamine, it can effectively adjust the pH value of the product to ensure the stability of the product. For example, the triethanolamine can be 1 part by mass, 1.5 parts by mass, or 1.9 parts by mass. When the triethanolamine is less than 0 part by mass, the pH adjustment effect is not obvious. When the triethanolamine is higher than 2 parts by mass, it may make the pH value of the product too high, affecting the performance and stability of the product, and may also have a certain impact on the environment.

[0042] In one embodiment, sodium dioctyl sulfosuccinate is a surfactant that has good wetting and penetration properties. It can make the product better wet the surface of the object, improving the adhesion and coating performance of the product.

[0043] Specifically, within the range of 0 - 1 part by mass of sodium dioctyl sulfosuccinate, it can effectively improve the wetting and penetration properties of the product without affecting other properties of the product. For example, the sodium dioctyl sulfosuccinate can be 0.1 part by mass, 0.5 part by mass, or 0.9 part by mass. When the sodium dioctyl sulfosuccinate is higher than 1 part by mass, it may cause the surface tension of the product to be too low, resulting in problems such as sagging, affecting the coating effect of the product.

[0044] In one embodiment, hydroxy-terminated polydimethylsiloxane can improve the softness, smoothness, and gloss of the product. At the same time, it also has a certain defoaming effect, which can prevent the product from generating foam during production and use.

[0045] Specifically, within the range of 0 - 1 part by mass of hydroxy-terminated polydimethylsiloxane, it can play obvious roles in softening, smoothing, and defoaming. For example, the hydroxy-terminated polydimethylsiloxane can be 0.1 part by mass, 0.5 part by mass, or 0.9 part by mass. When the hydroxy-terminated polydimethylsiloxane is higher than 1 part by mass, it may make the surface of the product too smooth, affecting the adhesion, and may also lead to an increase in cost.

[0046] In one embodiment, ethanol is used as a solvent, which can dissolve some components, enabling the components to be better mixed together. At the same time, it can also adjust the viscosity of the product, facilitating the coating and construction of the product.

[0047] Specifically, within the range of 10 - 20 parts by mass of ethanol, there can be enough solvent to dissolve the components and adjust the viscosity. For example, the ethanol can be 12 parts by mass, 15 parts by mass, 18 parts by mass, or 19 parts by mass. When the ethanol is less than 10 parts by mass, the effects of dissolution and viscosity adjustment are not good. When the ethanol is more than 20 parts by mass, there may be residual solvent odor after the product dries, and it will increase the cost and safety risks during the production process.

[0048] In one embodiment, water is used as a solvent or diluent, which acts together with ethanol, etc., to adjust the viscosity and drying speed of the product, and is also a carrier for some water-soluble components.

[0049] Specifically, within the range of 10 - 20 parts by mass of water, it can cooperate with other components to make the product reach an appropriate viscosity and drying speed. For example, the water can be 12 parts by mass, 15 parts by mass, 18 parts by mass, or 19 parts by mass. When the water is less than 10 parts by mass, it cannot effectively adjust the viscosity and drying speed. When the water is more than 10 parts by mass, it may cause a decline in the performance of the product, such as reduced adhesion and too long drying time.

[0050] In addition, non-film-forming acrylate copolymers and film-forming acrylate copolymers mainly differ in molecular structure, film-forming property, and performance.

[0051] In terms of molecular structure, non-film-forming acrylate copolymers will not form a continuous film under normal use conditions, and mainly play an auxiliary role in the system, such as improving flexibility, adhesiveness, etc. Film-forming acrylate copolymers have good film-forming properties. During the drying or curing process, the molecular chains will crosslink or entangle with each other to form a continuous film with certain strength and performance, thereby providing properties such as protection and adhesion for the product.

[0052] In terms of film-forming property, non-film-forming acrylate copolymers will not form a continuous film under normal use conditions, and mainly play an auxiliary role in the system, such as improving flexibility, adhesiveness, etc. Film-forming acrylate copolymers have good film-forming properties. During the drying or curing process, the molecular chains will crosslink or entangle with each other to form a continuous film with certain strength and performance, thereby providing properties such as protection and adhesion for the product.

[0053] Among the performance characteristics, the non-film-forming acrylate copolymer features outstanding flexibility and adhesiveness, enabling the product to have good spreadability and adhesiveness when not dried or cured, which facilitates the construction and application of the product. The main performance of the film-forming acrylate copolymer lies in the protective performance after film formation, such as good water resistance, chemical resistance, and mechanical strength, etc., which can effectively protect the object surface from the influence of the external environment.

[0054] In summary, the high-gloss coating of the present invention includes high-gloss varnish, non-film-forming acrylate copolymer, film-forming acrylate copolymer, polyethylene, polyethylene wax, sodium dodecyl sulfate, triethanolamine, sodium dioctyl sulfosuccinate, hydroxyl-terminated polydimethylsiloxane, ethanol, and water. Through the synergistic effect of each component, the gloss of the high-gloss coating is effectively improved. Compared with the gloss of the white card in the prior art within the range of 20 - 30 gloss units, the gloss of the high-gloss paper of the present invention can reach 60 - 90 gloss units, which is significantly increased by 3 - 4 times.

[0055] The use of the high-gloss coating in the present invention can reduce costs and improve production efficiency, which conforms to the industrial development trend of energy conservation, environmental protection, and high-efficiency production.

[0056] Compared with the gloss of the white card in the prior art within the range of 20 - 30 gloss units, the gloss of the high-gloss paper of the present invention can reach 60 - 90 gloss units, which is significantly increased by 3 - 4 times.

[0057] The high-gloss coating of the present invention is obtained by mixing high-gloss varnish, non-film-forming acrylate copolymer, film-forming acrylate copolymer, polyethylene, polyethylene wax, sodium dodecyl sulfate, triethanolamine, sodium dioctyl sulfosuccinate, hydroxyl-terminated polydimethylsiloxane, ethanol, and water.

[0058] Specifically, the mixing steps include:

[0059] A1. Mix ethanol and water evenly to obtain the first mixture; wherein, the mixing time is 5 - 10 minutes;

[0060] A2. Add non-film-forming acrylate copolymer, film-forming acrylate copolymer, polyethylene, and polyethylene wax to the first mixture and stir to obtain the second mixture; wherein, the stirring time is 30 - 60 minutes to ensure complete dispersion of the high molecular polymer;

[0061] A3. Add sodium dodecyl sulfate, sodium dioctyl sulfosuccinate, and hydroxyl-terminated polydimethylsiloxane to the second mixture and stir to obtain the third mixture; wherein, the stirring time is 20 - 30 minutes to enable the surfactant to fully play its role;

[0062] A4. Add high-gloss varnish and triethanolamine to the third mixture and stir to obtain a high-gloss coating; wherein, the stirring time is 30 - 60 minutes to make the whole system uniform and stable.

[0063] In addition, the high-gloss coating of the present invention can also be composed of film-forming substances, pigments, fillers, additives, and solvents. Here, pigments such as white pigments like titanium dioxide are used to provide high whiteness and covering power, and other colored pigments can also be added. Fillers such as calcium carbonate, kaolin, etc. Additives such as dispersants, leveling agents, defoaming agents, etc. Solvents such as organic solvents, water, etc. depending on the type of coating. Stir and mix the film-forming substances, pigments, fillers, additives, and solvents thoroughly to make the pigments and fillers uniformly dispersed in the film-forming substances.

[0064] In one embodiment, the high-gloss coating is evenly coated on the surface of the corona-treated paper by a coating device (such as by scraping, roll coating, spraying, etc.). The coating thickness needs to be adjusted according to the required high-gloss effect and the properties of the paper. For example, a thicker coating may obtain a higher glossiness, but it may also affect the flexibility and other properties of the paper.

[0065] In one embodiment, after coating, the solvents (such as water and ethanol) in the coating are volatilized by heating or natural drying, etc., and the film-forming substances gradually solidify to form a continuous high-gloss film. When heating and drying, the temperature and time need to be controlled well. Too high a temperature may cause the paper to deform or the coating performance to decline, and too low a temperature will result in too slow a drying speed, affecting production efficiency.

[0066] In one embodiment, the corona treatment time is 1 - 100 seconds, preferably, the corona treatment time is 5 - 30 seconds. Here, the specific corona treatment time depends on factors such as the thickness and material of the white cardboard and the required treatment effect. The corona treatment frequency is 20 - 40 kHz, and in special cases, special electrodes can be used for treatment. The voltage is 5000 - 15000 V. The high-frequency alternating voltage can cause corona discharge on the surface of the white cardboard to form plasma, thereby changing its surface properties.

[0067] The present invention can adjust the key parameters (voltage, frequency, time, etc.) during the corona treatment of the paper, affecting the roughness and activity degree of the paper surface, thereby improving its adsorption ability to the laminating material.

[0068] In step S2:

[0069] In one embodiment, the adhesive is an acrylic emulsion. Among them, the acrylic emulsion is a mixture composed of multiple components, including methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA), methacrylic acid (MAA), acrylamide (AM), and other additives. Here, the additives can be organic solutions or water.

[0070] Here, the content of the acrylic emulsion is 40 ± 2%. Here, the acrylic emulsion has multiple advantages as an adhesive: First, it has good bonding performance. It can adhere well to the surfaces of various materials, such as paper, wood, fabric, etc., because it can form strong intermolecular forces with the molecules on the surfaces of these materials, thus firmly bonding them together. Second, the acrylic emulsion has good flexibility. When the bonded materials are bent or stretched by external forces, it can deform accordingly without being easily broken, enabling the bonded area to still maintain a good connection state, which is very important for bonding some materials that require a certain amount of elastic deformation, such as the bonding between soft plastics or leathers. In addition, it is an aqueous emulsion and is more environmentally friendly than some solvent-based adhesives. During use, it does not release a large amount of organic solvents like solvent-based adhesives, thus reducing the impact on indoor air quality and potential harm to human health. Moreover, the film formed after drying is relatively transparent and does not affect the appearance of the bonded materials.

[0071] In the hot pressing and laminating treatment of the present invention, the pressure is 14 10 -18 10 N, the temperature is 70 - 90 °C, and the hot pressing time should also be controlled within 10 - 20 seconds. Here, the hot pressing and laminating adheres the laminating material to the paper under precisely controlled temperature, pressure, and time conditions, causing the adhesive to cure rapidly, so that the film layer tightly adheres to the paper surface. The hot pressing of the high-gloss film uses any one of a flat hot press, a roller hot press, and a vacuum hot press. Here, the hot pressing of the high-gloss film can ensure that the high-gloss paper has uniform gloss under certain conditions.

[0072] The cooling of the present invention adopts air cooling and / or water cooling. Here, the combined method of air cooling and water cooling is adopted to rapidly reduce the temperature of the paper, ensuring the stability of the film layer and the curing of the gloss.

[0073] Among them, air cooling uses a fan and / or an air conditioner to rapidly cool the paper. For example, when using a fan, the wind speed and direction of the fan need to be adjusted. The wind speed of the fan is 5 - 15 m / s, so that the cold air evenly blows over the paper surface. During the cooling process, the combination of the paper and the film gradually takes shape to form the finished high-gloss paper.

[0074] After the cooling of the present invention, the surface quality of the paper is inspected, such as whether the gloss is uniform, whether there are bubbles or wrinkles in the film, etc. Post-treatment processes such as cutting and packaging are carried out on the finished product to make it meet the specifications and requirements of actual applications.

[0075] In summary, the present invention adopts a film laminating transfer process: First, the paper is pretreated, and the surface roughness and activity of the paper are increased through corona treatment to improve its adsorption capacity for the laminating material. Then, a hot-pressing laminating technology is used to bond the laminating material to the paper. During the hot pressing process, the adhesive quickly cures, enabling the film layer to adhere tightly to the paper surface. Next, cooling and shaping are carried out to rapidly reduce the temperature of the paper, ensuring the stability of the film layer and the curing of the gloss.

[0076] The present invention also provides a high-gloss paper, which is prepared by the preparation method of the above-mentioned high-gloss paper. The high-gloss paper of the present invention is not easily damaged, has a low cost, and the gloss can reach 60 - 90 gloss units.

[0077] The present invention also provides an application of the high-gloss paper, and the high-gloss paper is used on a frame. Here, it is mainly used as a high-gloss frame paper. In addition, the high-gloss paper can also be used on wrapping paper, boxes for ornaments, etc.

[0078] Next, in combination with specific embodiments, some embodiments of the present invention will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0079] Example 1

[0080] This example provides a preparation method of a high-gloss coating, including the following steps:

[0081] A1. Mix 10 parts by mass of ethanol and 10 parts by mass of water for 5 - 10 minutes to obtain a first mixture;

[0082] A2. Add 25 parts by mass of a non-film-forming acrylate copolymer, 1 part by mass of a film-forming acrylate copolymer, 1 part by mass of polyethylene, and 1 part by mass of polyethylene wax to the first mixture, and stir for 30 - 60 minutes to obtain a second mixture;

[0083] A3. Add 1 part by mass of sodium dodecyl sulfate, 1 part by mass of sodium dioctyl sulfosuccinate, and 1 part by mass of hydroxyl-terminated polydimethylsiloxane to the second mixture, and stir for 20 - 30 minutes to obtain a third mixture;

[0084] A4. Add 35 parts by mass of high-gloss varnish and 2 parts by mass of triethanolamine to the third mixture, and stir for 30 - 60 minutes to obtain a high-gloss coating.

[0085] Example 2

[0086] This example provides a preparation method of a high-gloss coating, including the following steps:

[0087] A1. Mix 20 parts by mass of ethanol and 20 parts by mass of water for 5 - 10 minutes to obtain a first mixture;

[0088] A2. Add 38 parts by mass of a non - film - forming acrylate copolymer, 4 parts by mass of a film - forming acrylate copolymer, 3 parts by mass of polyethylene, and 4 parts by mass of polyethylene wax to the first mixture, and stir for 30 - 60 minutes to obtain a second mixture;

[0089] A3. Add 0.5 part by mass of sodium dodecyl sulfate, 0.5 part by mass of sodium dioctyl sulfosuccinate, and 0.7 part by mass of hydroxyl - terminated polydimethylsiloxane to the second mixture, and stir for 20 - 30 minutes to obtain a third mixture;

[0090] A4. Add 45 parts by mass of high - gloss varnish and 1.5 parts by mass of triethanolamine to the third mixture, and stir for 30 - 60 minutes to obtain a high - gloss coating.

[0091] Application Example 1

[0092] This application example provides a method for preparing high - gloss paper, which includes the following steps:

[0093] S1. Perform corona treatment on the paper, where the corona time is 30 seconds, the corona treatment frequency is 20 kHz, and the voltage is 5000 V / m 2 ;

[0094] S2. Uniformly coat the high - gloss coating on the surface of the corona - treated paper through a coating device, and dry it naturally to cure the high - gloss coating to form a high - gloss film;

[0095] S3. Coat the surface of the corona - treated paper with acrylic emulsion, then hot - press and laminate the high - gloss film, and cool and shape it to obtain high - gloss paper.

[0096] Application Example 2

[0097] This application example provides a method for preparing high - gloss paper, which includes the following steps:

[0098] S1. Perform corona treatment on the paper, where the corona time is 30 seconds, the corona treatment frequency is 20 kHz, and the voltage is 5000 V / m 2 ;

[0099] S2. Uniformly coat the high - gloss coating of Example 2 on the surface of the corona - treated paper through a coating device, and dry it naturally to cure the high - gloss coating to form a high - gloss film;

[0100] S3. Coat the surface of the corona - treated paper with acrylic emulsion, then hot - press and laminate the high - gloss film, and cool and shape it to obtain high - gloss paper.

[0101] Compared with the glossiness of white cards in the prior art within the range of 20 - 30 gloss, the glossiness of the high-gloss paper in Application Example 1 and Application Example 2 can reach 60 - 90 gloss, and the high-gloss paper is not easy to fall off.

[0102] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing high-gloss paper, characterized in that, The preparation method includes: S1. Coating the corona-treated paper surface with a high-gloss coating, and heating or drying to cure the high-gloss coating to form a high-gloss film; S2. Coating the corona-treated paper surface with an adhesive, and then thermocompression laminating the high-gloss film, followed by cooling and shaping to obtain the high-gloss paper.

2. The preparation method according to claim 1, characterized in that, The high-gloss coating consists of the following components:

3. The preparation method according to claim 2, characterized in that, The high-gloss coating is obtained by mixing high-gloss varnish, non-film-forming acrylate copolymer, film-forming acrylate copolymer, polyethylene, polyethylene wax, sodium dodecyl sulfate, triethanolamine, sodium dioctyl sulfosuccinate, hydroxyl-terminated polydimethylsiloxane, ethanol, and water.

4. The preparation method according to claim 1, wherein The time of the corona treatment is 1 - 100 seconds, and the frequency of the corona treatment is 20 - 40 kHz.

5. The preparation method according to claim 1, characterized in that, In the hot-pressed and high-gloss film, the pressure is 14 10 -18 10 N, the temperature is 70 - 90 °C, and the hot-pressing time is 10 - 20 seconds.

6. The preparation method according to claim 1, wherein The cooling is performed by air cooling and / or water cooling, wherein the air cooling uses a fan and / or an air conditioner.

7. The preparation method according to claim 6, characterized in that, When using a fan, the wind speed of the fan is 5 - 15 m / s.

8. The preparation method according to claim 1, wherein The adhesive is an acrylic emulsion.

9. A high-gloss paper, characterized in that, The high-gloss paper is prepared by the preparation method of the high-gloss paper according to any one of claims 1 - 8.

10. Application of a high-gloss paper, characterized in that, The high-gloss paper according to claim 9 is used on a frame.

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