Ink, high-fullness plain color decorative paper and production process

Abstract

The invention discloses an ink, a high-fullness plain color decorative paper and a production process, which relates to the technical field of decorative paper, and comprises the following components by weight: 30-40 parts of titanium dioxide, 20-30 parts of water-based resin, 2-3 parts of dispersant, 1-2 parts of surfactant, 2-4 parts of double-layer slow-release quick-drying agent and 15-20 parts of water. The invention has the effect of improving the drying speed and uniformity of the ink during the printing process, while ensuring the effect of surface whiteness and overall visual fullness.

Description

Technical Field

[0001] The invention relates to the technical field of decorative paper, and in particular to ink, high-fullness plain decorative paper and a production process. Background Art

[0002] Water-based ink is made of water as solvent, which greatly reduces or avoids the use of organic solvents, greatly improving the environmental performance, safety performance and health protection of operators. In addition, today's water-based inks are gradually comparable to solvent-based inks in terms of printing quality and stability.

[0003] The existing water-based ink for plain paper printing is made by mixing water-based white ink with other colored water-based original inks and diluents. The pigment used in white ink is mainly titanium dioxide. The main component of titanium dioxide is a white pigment called titanium dioxide (TiO2). It has a stable lattice and is an important white pigment and porcelain glaze. Compared with other white pigments, it has superior whiteness, tinting power, hiding power, weather resistance, heat resistance and chemical stability.

[0004] However, during the printing process, the drying speed of titanium dioxide ink will affect the whiteness and saturation of titanium dioxide. If the titanium dioxide ink dries too quickly, the leveling of the ink will be reduced, which can easily lead to uneven distribution of titanium dioxide particles on the paper surface. Titanium dioxide particles cannot completely fill the pores on the paper surface, forming an uneven microstructure, thereby reducing the whiteness and saturation, and the surface gloss and uniformity appear poor. When the drying speed is too slow, titanium dioxide may settle due to gravity, resulting in uneven distribution of particles in the ink layer, affecting the overall whiteness effect. In addition, too slow drying may also cause the ink to penetrate into the paper fibers, reducing the number of titanium dioxide particles and reducing the color saturation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide an ink, a high-saturation solid color decorative paper and a production process.

[0006] The above object of the present invention is achieved through the following technical solutions: An ink comprising the following components in parts by weight: 30-40 parts of titanium dioxide; 20-30 parts of water-based resin; 2-3 parts of dispersant; 1-2 parts of surfactant; 2 to 4 parts of double-layer slow-release quick-drying agent; 15-20 parts of water.

[0007] Furthermore, the double-layer sustained-release quick-drying agent includes core particles and a surface layer covering the core particles, the core particles are sustained-release particles with ethanol as the core solvent and polylactic acid as the coating material, and the surface layer is selected from polyvinyl alcohol or polyethylene glycol.

[0008] Further, the core particles are prepared by comprising the following components in parts by weight; 5-8 parts of ethanol; Polylactic acid 5-10 parts; 100-120 parts of dichloromethane; 0.5-2 parts of polyvinyl alcohol; 100-130 parts of deionized water.

[0009] Furthermore, the preparation method of the core particles is as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: Mix polyvinyl alcohol and deionized water in proportion to obtain solution B, add solution B dropwise into solution A, and then disperse and emulsify with a high-speed stirrer or ultrasonic dispersing equipment to obtain an emulsion containing suspended emulsified particles; Step C: volatilize the emulsion at a low temperature of 10-15° C. to evaporate dichloromethane to solidify the emulsified particles into solid microcapsule particles, and obtain core particles after filtering, washing and drying.

[0010] Furthermore, the preparation steps of the double-layer slow-release quick-drying agent are as follows: Step 1: preparing core particles; Step 2: Use a spray coating method to cover the surface layer on the surface of the core particles.

[0011] The double-layer slow-release quick-drying agent added in the present invention demonstrates significant technical advantages in the printing application of titanium dioxide ink. This innovative design combines the dual slow-release properties of the core particles and the surface layer, optimizes the drying performance of the ink, and effectively improves the whiteness, fullness and uniformity of the surface of the printed paper. The core particles of the double-layer slow-release quick-drying agent are composed of ethanol as the core solvent, polylactic acid as the coating material, and then covered with polyvinyl alcohol or polyethylene glycol to form an outer layer. Its preparation method ensures that ethanol can be gradually released during application to adjust the drying process, avoiding the problem of drying too fast or too slow in traditional inks.

[0012] When the ink is printed, the surface layer dissolves quickly after contacting the paper, allowing the ink to dry quickly and be initially fixed, ensuring uniform distribution of the ink on the paper and good adhesion. This rapid initial drying avoids the phenomenon of titanium dioxide particles penetrating deep into the paper fiber when wet, thereby preventing the reduction of pigment particles in the surface ink, which is crucial for maintaining high whiteness and high fullness. After the surface layer is dissolved, the ethanol in the core particles is gradually released, continuously promoting the overall drying process of the ink, allowing the ink to maintain a uniform curing rate throughout the drying cycle. This design not only maintains the uniformity of the ink surface and avoids uneven drying, but also makes the entire drying process smoother and reduces the risk of bubbles or cracking.

[0013] The gradual release of slow-release ethanol helps to form a stable titanium dioxide pigment layer and improve the whiteness and fullness of the ink by adjusting the drying time. Due to the slow-release effect of ethanol, the ink has a longer film-forming time on the paper surface, ensuring the uniform distribution of pigment particles, and will not cause uneven particle distribution or incomplete curing due to rapid volatilization. In addition, the slow-release design avoids the surface crusting caused by too fast drying, ensuring a smooth and uniform coating on the paper surface, so that the whiteness and visual fullness reach the best state.

[0014] In traditional quick-drying inks, the rapid evaporation of solvents may cause the pigment in the ink layer to sink, affecting the optical properties and whiteness of the coating. However, through the double-layer slow-release quick-drying agent, the core ethanol in the ink can continue to be slowly released after the surface is initially dry, supporting the stability of the pigment and reducing the problem of pigment sedimentation caused by uneven drying, thereby ensuring consistent whiteness and uniform color on the printed surface. In addition, polylactic acid as a core coating material has good biodegradability, which not only provides the necessary slow-release effect, but also conforms to the trend of environmentally friendly printing materials. The solubility of the outer layer of polyvinyl alcohol or polyethylene glycol can be quickly activated when it comes into contact with water or moisture, thereby achieving the need for initial rapid drying in printing.

[0015] This slow-release structure regulates the drying rate so that the titanium dioxide particles can be evenly distributed and firmly attached in the coating, avoiding the problem of uneven coating caused by migration or imbalance of pigments during printing and drying. In addition, the continuous release effect of the core particles makes the drying time of the ink surface longer, ensuring sufficient fluidity and film-forming ability, and ultimately making the distribution of titanium dioxide more uniform, which significantly contributes to improving whiteness and fullness.

[0016] Furthermore, in step 2, the thickness of the surface layer is controlled into three types: thin layer, middle layer and thick layer, and the ratio of the core particles of the surface layer covering the thin layer, middle layer and thick layer respectively is 1:0.8-1.6:0.9-1.8; the D50 particle size of the core particles of the surface layer covering the thin layer, middle layer and thick layer respectively is 10-50μm, 100-200μm and 300-500μm.

[0017] Furthermore, the average particle size of the core particles is 2 to 6 μm, and the core particles include high ethanol content particles and low ethanol content particles. The mass ratio of ethanol to polylactic acid in the high ethanol content particles is 1:1 to 1.2, and the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:1.5 to 2.

[0018] The fine control of the thickness of the surface layer in step 2, as well as the adjustment of the ratio and particle size of different core particles, is intended to enhance the performance of the double-layer slow-release quick-drying agent in the ink, thereby achieving better quick-drying and higher whiteness uniformity and fullness during the printing process. The surface layer is divided into three types: thin layer, medium layer and thick layer, and its coverage on the core particles is precisely adjusted to ensure that the slow-release agent can flexibly adapt to different environments and application requirements during the entire drying process.

[0019] By covering the core particles with thin, medium and thick surface layers, the quick-drying agent has different release characteristics. For example, a thin layer of surface coverage can quickly dissolve and initially release the ethanol in the core, allowing the ink to begin initial drying immediately after printing, forming a rapid setting effect. This helps prevent the pigment particles from sinking into the paper fibers due to excessive flow in the early stages of the ink. The medium and thick layer coverage can delay the release time of the core ethanol, thereby maintaining the balance of the entire drying process. The slow-release design of the middle layer gradually releases ethanol after initial drying, making the ink drying process stable and uniform, avoiding crusting or cracking caused by too fast drying of the surface layer. Thick layer coverage can ensure the slow-release effect in the final stage, prolong the drying time, and make the ink as a whole present a longer uniform curing to ensure a smooth and spot-free printed surface.

[0020] The ratio of core particles covering thin, medium and thick layers of the surface layer is set at 1:0.8-1.6:0.9-1.8, which is intended to regulate the mixing ratio of different types of quick-drying agents in the ink to ensure that its drying characteristics are adapted to different printing requirements. For example, in mass production that requires fast printing, the ratio of thin layer particles can be increased to speed up the initial drying speed; while in high-quality printing that requires higher uniformity and fullness, the ratio of medium and thick layer particles is increased to ensure that the pigment particles do not lose uniformity when drying.

[0021] The D50 particle size of the core particles is divided into different types of 10-50μm, 100-200μm, and 300-500μm, which further refines the drying and film-forming behavior of the ink. Small particle size (10-50μm) particles have faster dissolution and release speeds, which are suitable for the rapid drying stage, while larger particle size (300-500μm) particles release more slowly and are suitable for the subsequent stable drying process. This multi-particle size combination not only improves the initial and later drying control in printing, but also ensures sufficient wettability before the ink is fully cured, thereby avoiding uneven color or pigment sinking caused by premature drying.

[0022] The average particle size of the core particles is 2 to 6 μm, and this range is selected based on the stability of the particle distribution in the ink and its adaptability when forming a coating on the paper surface. Too small a particle size may lead to rapid release of the core ethanol and lose the sustained release effect, while too large a particle size may affect the fluidity and uniform coating effect of the ink. Combined with the mixed design of core particles with high and low ethanol content, the mass ratio of ethanol to polylactic acid can be adjusted to 1:1 to 1.2 and 1:1.5 to 2, respectively, so that the quick-drying agent can provide an appropriate amount of ethanol release at different stages. This adjustment realizes multi-stage drying control from the initial drying of the printed surface to the complete curing process.

[0023] By properly matching high-ethanol content particles with low-ethanol content particles, the ink drying process can maintain the best state at different times. High-ethanol content particles release more ethanol in the initial stage, which can quickly reduce the surface humidity of the ink, so that the ink will not spread too quickly after contacting the paper, and maintain a certain uniformity; while low-ethanol content particles provide slowly released ethanol in the later stage to maintain the balance of drying, prevent the surface from drying too quickly, and avoid problems such as cracking or uneven curing that may occur during the printing process.

[0024] Through the above multi-level regulation, the ink not only shows fast and balanced drying performance during the printing process, but also ensures the surface whiteness and overall visual fullness. The combination of ethanol and polylactic acid materials used in the double-layer slow-release quick-drying agent not only improves the quick-drying effect, but also conforms to the current trend of green printing due to its environmentally friendly and biodegradable characteristics. By adjusting the ratio and particle size of the core particles and the surface layer, flexible application for different printing needs and paper types is achieved. Ultimately, this combination makes the use of titanium dioxide ink more ideal, and the quality stability and appearance consistency of printed products have been significantly improved, meeting the high standards for visual effects in the high-quality printing and decorative paper markets.

[0025] Furthermore, the D50 particle size of the titanium dioxide is 0.2-0.5 μm, the dispersant is polyacrylic alcohol amine salt, and the water-based resin is selected from one or more of water-based acrylic resin, water-based polyurethane resin or water-based polyamide resin.

[0026] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0027] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after the ink is applied at 70-100°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0028] Compared with the prior art, the present invention has the following beneficial effects: By adding a double-layer slow-release quick-drying agent slow-release ethanol solvent, the fullness and uniformity of the whiteness of the decorative paper after ink printing are improved. Wherein, the material used in the surface layer can be dissolved relatively quickly in the ink, so that the ink is initially dried when it contacts the surface of the paper, so that the ink is initially shaped on the decorative paper, and the ethanol in the core particles is gradually released, which further accelerates the overall drying of the ink, so that the ink is more uniform and faster and low is shaped, and too many titanium dioxide particles are avoided from infiltrating into the paper fiber, resulting in too few titanium dioxide particles in the surface ink, and causing the saturation to be too low. Therefore, after the addition of the double-layer slow-release quick-drying agent of the present invention, the ink is dried at a speed that best meets the maximum whiteness effect of the ink, thereby greatly improving the titanium dioxide ink fullness during printing. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with embodiments.

[0030] Embodiment 1, an ink disclosed in Embodiment 1, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0031] The water-based resin is a water-based acrylic resin.

[0032] The D50 particle size of titanium dioxide is 0.2 μm.

[0033] The dispersant is polyacrylic acid amine salt.

[0034] The surfactant is BYK-346 silicone surfactant.

[0035] The double-layer slow-release quick-drying agent includes a core particle and a surface layer covering the surface of the core particle. The core particle is a slow-release particle with ethanol as the core solvent and polylactic acid as the coating material, and is prepared by the following components in parts by weight: 5 parts of ethanol, 10 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared by polyvinyl alcohol.

[0036] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0037] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0038] In some other embodiments of the present invention, core particles containing different ethanol ratios can be obtained by controlling the addition amounts of polylactic acid and ethanol in step A, including particles with high ethanol content and particles with low ethanol content. The mass ratio of ethanol to polylactic acid in the particles with high ethanol content is 1:1-1.2, and the mass ratio of ethanol to polylactic acid in the particles with low ethanol content is 1:1.5-2.

[0039] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0040] In some other embodiments of the present invention, the time and concentration of the polyvinyl alcohol solution spraying can be controlled to obtain core particles covered with surface layers of different thicknesses. In the present invention, core particles covered with thin, medium and thick surface layers can be obtained, and the D50 particle sizes are 10-50 μm, 100-200 μm and 300-500 μm respectively.

[0041] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0042] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0043] Embodiment 2, an ink disclosed in Embodiment 2, comprises the following components in parts by weight: 30 parts of titanium dioxide; 20 parts of water-based resin; 2 parts of dispersant; 2 parts of surfactant; 2 parts of double-layer slow-release quick-drying agent; 15 parts water.

[0044] The water-based resin is a water-based acrylic resin.

[0045] The D50 particle size of titanium dioxide is 0.5 μm.

[0046] The dispersant is polyacrylic acid amine salt.

[0047] The surfactant is BYK-346 silicone surfactant.

[0048] The double-layer slow-release quick-drying agent includes a core particle and a surface layer covering the surface of the core particle. The core particle is a slow-release particle with ethanol as the core solvent and polylactic acid as the coating material, and is prepared by the following components in parts by weight: 8 parts of ethanol, 10 parts of polylactic acid, 1 part of polyvinyl alcohol, 120 parts of dichloromethane, and 120 parts of deionized water. The surface layer is prepared by polyvinyl alcohol.

[0049] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0050] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0051] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0052] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0053] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0054] Embodiment 3, an ink disclosed in Embodiment 3, comprises the following components in parts by weight: 35 parts of titanium dioxide; 25 parts of water-based resin; 2.5 parts of dispersant; 1.5 parts of surfactant; 3 parts of double-layer slow-release quick-drying agent; 17 parts water.

[0055] The water-based resin is a water-based acrylic resin.

[0056] The D50 particle size of titanium dioxide is 0.3 μm.

[0057] The dispersant is polyacrylic acid amine salt.

[0058] The surfactant is BYK-346 silicone surfactant.

[0059] The double-layer slow-release quick-drying agent includes a core particle and a surface layer covering the surface of the core particle. The core particle is a slow-release particle with ethanol as the core solvent and polylactic acid as the coating material, and is prepared by the following components in parts by weight: 7 parts of ethanol, 8 parts of polylactic acid, 0.5 parts of polyvinyl alcohol, 110 parts of dichloromethane, and 110 parts of deionized water. The surface layer is prepared by polyvinyl alcohol.

[0060] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0061] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0062] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, the core particles were placed in a fluidized bed, the core particles were rolled evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after the spraying was completed, it was dried at 50°C for 20 minutes; the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 200μm.

[0063] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0064] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0065] Embodiment 4, an ink disclosed in Embodiment 4, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0066] The water-based resin is a water-based polyamide resin.

[0067] The D50 particle size of titanium dioxide is 0.2 μm.

[0068] The dispersant is polyacrylic acid amine salt.

[0069] The surfactant is BYK-346 silicone surfactant.

[0070] The double-layer slow-release quick-drying agent includes a core particle and a surface layer covering the surface of the core particle. The core particle is a slow-release particle with ethanol as the core solvent and polylactic acid as the coating material, and is prepared by the following components in parts by weight: 5 parts of ethanol, 10 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared by polyethylene glycol.

[0071] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0072] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0073] In some other embodiments of the present invention, core particles containing different ethanol ratios can be obtained by controlling the addition amounts of polylactic acid and ethanol in step A, including particles with high ethanol content and particles with low ethanol content. The mass ratio of ethanol to polylactic acid in the particles with high ethanol content is 1:1-1.2, and the mass ratio of ethanol to polylactic acid in the particles with low ethanol content is 1:1.5-2.

[0074] (2) Preparation of surface layer Polyethylene glycol was dissolved in water to obtain a 5wt% polyethylene glycol solution, the core particles were placed in a fluidized bed, the core particles were rolled evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after the spraying was completed, it was dried at 50°C for 20 minutes; the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 100μm.

[0075] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0076] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0077] Embodiment 5, an ink disclosed in Embodiment 5, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0078] The water-based resin is a water-based polyurethane resin.

[0079] The D50 particle size of titanium dioxide is 0.2 μm.

[0080] The dispersant is polyacrylic acid amine salt.

[0081] The surfactant is BYK-346 silicone surfactant.

[0082] The double-layer slow-release quick-drying agent includes a core particle and a surface layer covering the surface of the core particle. The core particle is a slow-release particle with ethanol as the core solvent and polylactic acid as the coating material, and is prepared by the following components in parts by weight: 5 parts of ethanol, 10 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared by polyvinyl alcohol.

[0083] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0084] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0085] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0086] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0087] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0088] Embodiment 6, an ink disclosed in Embodiment 6, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0089] The water-based resin is a water-based acrylic resin.

[0090] The D50 particle size of titanium dioxide is 0.2 μm.

[0091] The dispersant is polyacrylic acid amine salt.

[0092] The surfactant is BYK-346 silicone surfactant.

[0093] The double-layer slow-release quick-drying agent includes core particles and a surface layer covering the surface of the core particles. The core particles are slow-release particles with ethanol as the core solvent and polylactic acid as the coating material, and the core particles include high-ethanol content particles and low-ethanol content particles. Among them, the high-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 6 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The low-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 10 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared from polyvinyl alcohol.

[0094] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0095] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0096] The mass ratio of ethanol to polylactic acid in the high ethanol content particles of the present invention is 1:1.2, and the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:2. In some other embodiments of the present invention, the mass ratio of high ethanol content particles to low ethanol content particles can also be 1:3-8.

[0097] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0098] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0099] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0100] Embodiment 7, an ink disclosed in Embodiment 7, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0101] The water-based resin is a water-based acrylic resin.

[0102] The D50 particle size of titanium dioxide is 0.2 μm.

[0103] The dispersant is polyacrylic acid amine salt.

[0104] The surfactant is BYK-346 silicone surfactant.

[0105] The double-layer slow-release quick-drying agent includes core particles and a surface layer covering the surface of the core particles. The core particles are slow-release particles with ethanol as the core solvent and polylactic acid as the coating material, and the core particles include high-ethanol content particles and low-ethanol content particles. Among them, the high-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 5 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The low-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 7.5 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared from polyvinyl alcohol.

[0106] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0107] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0108] In the present invention, the mass ratio of ethanol to polylactic acid in the high ethanol content particles is 1:1, the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:1.5. The mass ratio of the high ethanol content particles to the low ethanol content particles is 1:5.

[0109] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0110] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0111] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0112] Embodiment 8, an ink disclosed in Embodiment 8, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0113] The water-based resin is a water-based acrylic resin.

[0114] The D50 particle size of titanium dioxide is 0.2 μm.

[0115] The dispersant is polyacrylic acid amine salt.

[0116] The surfactant is BYK-346 silicone surfactant.

[0117] The double-layer slow-release quick-drying agent includes core particles and a surface layer covering the surface of the core particles. The core particles are slow-release particles with ethanol as the core solvent and polylactic acid as the coating material, and the core particles include high-ethanol content particles and low-ethanol content particles. Among them, the high-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 5.5 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The low-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 9 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared from polyvinyl alcohol.

[0118] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0119] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0120] In the present invention, the mass ratio of ethanol to polylactic acid in the high ethanol content particles is 1:1.1, the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:1.8, and the mass ratio of the high ethanol content particles to the low ethanol content particles is 1:5.

[0121] (2) Preparation of surface layer Polyvinyl alcohol was dissolved in water to obtain a 5wt% polyvinyl alcohol solution, and the core particles were placed in a fluidized bed to allow the core particles to roll evenly, and then the polyvinyl alcohol solution was sprayed onto the surface of the core particles by a pressure sprayer; after spraying, the particles were dried at 50°C for 20 minutes; and the particles with a coating completeness of less than 60% were screened out. The D50 particle size of the core particles covering the surface layer was 50μm.

[0122] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0123] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0124] Embodiment 9, an ink disclosed in Embodiment 9, comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 4 parts of double-layer slow-release quick-drying agent; 20 parts water.

[0125] The water-based resin is a water-based acrylic resin.

[0126] The D50 particle size of titanium dioxide is 0.2 μm.

[0127] The dispersant is polyacrylic acid amine salt.

[0128] The surfactant is BYK-346 silicone surfactant.

[0129] The double-layer slow-release quick-drying agent includes core particles and a surface layer covering the surface of the core particles. The core particles are slow-release particles with ethanol as the core solvent and polylactic acid as the coating material, and the core particles include high-ethanol content particles and low-ethanol content particles. Among them, the high-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 5.5 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The low-ethanol content particles include the following components in parts by weight to prepare 5 parts of ethanol, 9 parts of polylactic acid, 2 parts of polyvinyl alcohol, 100 parts of dichloromethane, and 100 parts of deionized water. The surface layer is prepared from polyvinyl alcohol.

[0130] Preparation method of double-layer slow-release quick-drying agent: The core particles are prepared by comprising the following components in parts by weight; (1) Preparation of core particles The core particles were prepared as follows: Step A: polylactic acid and dichloromethane are mixed and stirred uniformly according to a proportion, and ethanol is added thereto according to a proportion, and stirred uniformly to obtain solution A; Step B: After polyvinyl alcohol and deionized water are uniformly mixed in proportion to obtain solution B, solution B is added dropwise to solution A, and then dispersed and emulsified by a high-speed stirrer to obtain an emulsion containing suspended emulsified particles; wherein the stirring speed of the high-speed stirrer is controlled to 6000 rpm, and the emulsification time is controlled to 10 min.

[0131] Step C: reduce the rotation speed to 300 rpm, volatilize dichloromethane at low temperature at 10°C for 6 hours, solidify the emulsified particles into solid microcapsule particles, and then filter, wash and dry to obtain core particles, the average particle size of the core particles is 6 μm.

[0132] In the present invention, the mass ratio of ethanol to polylactic acid in the high ethanol content particles is 1:1.1, the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:1.8, and the mass ratio of the high ethanol content particles to the low ethanol content particles is 1:5.

[0133] (2) Preparation of surface layer Dissolve polyvinyl alcohol in water to obtain a 5wt% polyvinyl alcohol solution, place the core particles in a fluidized bed, make the core particles roll evenly, and then spray the polyvinyl alcohol solution onto the surface of the core particles by a pressure sprayer; after spraying, dry at 50°C for 20 minutes; screen out particles with a coating completeness of less than 60%. In this embodiment, the time and concentration of the polyvinyl alcohol solution spraying are controlled to obtain core particles covered with a thin layer, a middle layer and a thick layer of the surface layer, and the mass ratio is 1:1.6:1.8. In the present invention, the core particles with surface layers covered with a thin layer, a middle layer and a thick layer can be obtained, and the particle sizes of the core particles are 50μm, 200μm, and 500μm, respectively.

[0134] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0135] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0136] The difference between Example 10 and Example 9 is that the core particles are covered with a surface layer of thin, middle and thick layers in a mass ratio of 1:1.2:1.6.

[0137] The difference between Example 11 and Example 9 is that the core particles are covered with a surface layer of thin layer, middle layer and thick layer, and the mass ratio is 1:0.8:0.9.

[0138] The difference between Example 12 and Example 9 is that the 50 particle sizes of the core particles covered with the surface layers of thin, middle and thick layers are 10 μm, 100 μm and 300 μm respectively.

[0139] The difference between Example 13 and Example 9 is that the 50 particle sizes of the core particles covered with the surface layers of thin, middle and thick layers are 30 μm, 150 μm and 400 μm respectively.

[0140] Comparative Example: Comparative Example 1 An ink disclosed in Example 1 comprises the following components in parts by weight: 40 parts of titanium dioxide; 30 parts of water-based resin; 3 parts of dispersant; 1 part of surfactant; 20 parts water.

[0141] The water-based resin is a water-based acrylic resin.

[0142] The D50 particle size of titanium dioxide is 0.2 μm.

[0143] The dispersant is polyacrylic acid amine salt.

[0144] The surfactant is BYK-346 silicone surfactant.

[0145] A decorative paper prepared with the above ink comprises a fiber base paper and an ink layer printed on the fiber base paper.

[0146] A production process for decorative paper comprises the following steps: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after ink application at 70°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

[0147] Detection method: Whiteness detection Steps detailed description: Sample preparation: Cut the decorative paper sample into small pieces of 10 cm × 10 cm in size, making sure the sample is free of wrinkles or contamination.

[0148] Instrument calibration: Turn on the ISO whiteness meter and perform a standard calibration using a standard white plate (reflectivity 100%).

[0149] Once the instrument has been calibrated, set the parameters according to the standard used (e.g. CIE D65 illuminant).

[0150] Test process: Place the sample flat on the test table of the whiteness meter. Close the test area cover to reduce external light interference. Start the test and record the CIE whiteness value of the sample. Test samples in different areas (equally divided into 10 areas), record the average whiteness value and the difference between the maximum whiteness value and the minimum whiteness value, the results are shown in Table 1 below.

[0151] Table 1

[0152] Through the above whiteness test, it can be clearly seen that the decorative paper obtained after printing with the ink of the present invention has a higher and more uniform whiteness, that is, a fuller whiteness. Moreover, by controlling the parameters of the core particles and the surface layer in the double-layer slow-release quick-drying agent, the uniformity and fullness of the decorative paper obtained after printing with the ink of the present invention can be significantly improved.

[0153] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An ink, characterized in that: The composition comprises the following components in parts by weight: 30-40 parts of titanium dioxide; 20-30 parts of water-based resin; 2-3 parts of dispersant; 1-2 parts of surfactant; 2 to 4 portions of double-layer slow-release quick-drying agent; 15-20 parts of water.

2. An ink according to claim 1, characterized in that: The double-layer slow-release quick-drying agent comprises a core particle and a surface layer covering the core particle. The core particle is a slow-release particle with ethanol as a core solvent and polylactic acid as a coating material. The surface layer is selected from polyvinyl alcohol or polyethylene glycol.

3. An ink according to claim 2, characterized in that: The core particles are prepared by comprising the following components in parts by weight; 5-8 parts of ethanol; Polylactic acid 5-10 parts; 100-120 parts of dichloromethane; 0.5-2 parts of polyvinyl alcohol; 100-130 parts of deionized water.

4. An ink according to claim 3, characterized in that: The preparation method of the core particles is as follows: Step A: Mix polylactic acid and dichloromethane in proportion and stir evenly, then add ethanol in proportion. Stir evenly to obtain solution A; Step B: Mix polyvinyl alcohol and deionized water in proportion to obtain solution B, add solution B dropwise into solution A, and then disperse and emulsify with a high-speed stirrer or ultrasonic dispersing equipment to obtain an emulsion containing suspended emulsified particles; Step C: volatilize the emulsion at a low temperature of 10-15° C. to evaporate dichloromethane to solidify the emulsified particles into solid microcapsule particles, and obtain core particles after filtering, washing and drying.

5. An ink according to claim 2, characterized in that: The preparation steps of the double-layer slow-release quick-drying agent are as follows: Step 1: preparing core particles; Step 2: Use a spray coating method to cover the surface layer on the surface of the core particles.

6. An ink according to claim 5, characterized in that: In the step 2, the thickness of the surface layer is controlled to be three types: thin layer, middle layer and thick layer. The ratio of the core particles of the surface layer covering the thin layer, middle layer and thick layer respectively is 1:0.8-1.6:0.9-1.8; the D50 particle size of the core particles of the surface layer covering the thin layer, middle layer and thick layer respectively is 10-50μm, 100-200μm and 300-500μm.

7. An ink according to claim 3, characterized in that: The average particle size of the core particles is 2 to 6 μm. The core particles include high ethanol content particles and low ethanol content particles. The mass ratio of ethanol to polylactic acid in the high ethanol content particles is 1:1 to 1.2, and the mass ratio of ethanol to polylactic acid in the low ethanol content particles is 1:1.5 to 2.

8. An ink according to claim 1, characterized in that: The D50 particle size of the titanium dioxide is 0.2-0.5 μm, the dispersant is polyacrylic alcohol amine salt, and the water-based resin is selected from one or more of water-based acrylic resin, water-based polyurethane resin or water-based polyamide resin.

9. A decorative paper prepared according to the ink according to any one of claims 1 to 8, characterized in that: It includes a fiber base paper and an ink layer printed on the fiber base paper.

10. A process for producing decorative paper according to claim 9, characterized in that: The following steps are involved: S1: prepare ink; S2: Printing ink onto fiber base paper through a printing device; S3: Drying the fiber base paper after the ink is applied at 70-100°C; S4: impregnating the dried fiber base paper with melamine resin and then curing it.

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