A stone color-enhancing primer, a preparation method thereof and application thereof

Abstract

The application relates to the technical field of stone color-enhancing primers, in particular to a stone color-enhancing primer and a preparation method and application thereof, which is prepared from the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin, 5-10 parts of water-based epoxy resin, 3-5 parts of tackifier, 2-4 parts of wetting agent, 5-10 parts of crosslinking agent, 2-3 parts of antioxidant, 4-6 parts of micro-silica powder, 1-3 parts of nano vitrified microbead, 3-5 parts of nano calcium carbonate, 0-10 parts of pigment and 10-20 parts of solvent. The color-enhancing primer is coated on the back of the stone to form a composite resin layer which is colored and optically uniform, has excellent weather resistance, light resistance and long-term color stability, does not fade, peel off or migrate and seep out, does not fade or peel off during long-term use, solves the technical defects of limited surface layer effect, limited penetration, color confusion and poor durability of the existing surface spraying, soaking dyeing and film coating technologies, and is especially suitable for high-end light-transmitting stone background walls, screens and ceiling large-area backlight decoration scenes.

Description

Technical Field

[0001] This application relates to the field of stone color-enhancing primer technology, and more specifically, to a stone color-enhancing primer, its preparation method, and its application. Background Technology

[0002] Natural stone, with its unique texture, feel, and decorative effect, has long been widely used in high-end architectural decoration, such as hotel lobbies, airport terminals, and villa clubs. However, as a natural mineral resource, the color, texture, and mineral composition of natural stone are greatly affected by the distribution of mineral layers, geological conditions, and mining batches, resulting in significant color differences within the same piece of stone or between different batches. For large-area applications, this natural color difference severely affects the overall aesthetic and visual consistency of the decoration, making it difficult to meet the stringent requirements of modern architects for high-quality, highly uniform decorative effects. This is especially true for translucent stones (such as snowflake white and jade-like stones), where the natural color difference is further amplified under backlighting. Due to the uneven distribution of minerals within the stone, lighter-colored areas have higher light transmittance, appearing as bright spots under backlighting, while darker or denser areas have lower light transmittance, forming dark areas. This results in an uneven, mottled appearance, severely damaging the soft, uniform visual effect that translucent stone should possess. This problem is particularly prominent in applications such as high-end translucent background walls, screens, and suspended ceilings. To address the issue of color variation in stone, the industry has developed various color-enhancing technologies. One widely used method is surface dyeing or spraying, which involves applying dyes or pigments to the front or back of the stone to change its color. However, this method only affects the surface layer of the stone; the dye cannot penetrate the stone's internal pores, resulting in poor wear resistance and weather resistance, and fading and peeling are likely to occur after long-term use. Another method is whole-body immersion dyeing, where the entire stone is immersed in the dye solution, allowing the dye to penetrate the stone's interior through capillary action. However, natural stone (especially dense marble and jade) has limited and uneven porosity, so the dye penetration depth is usually only a few millimeters, and the interior still retains its original color, making it impossible to achieve a true change in the base color. For high-density stone, the dyeing effect is even worse, and the dye's fixation stability inside the stone is insufficient, posing a risk of migration and seepage later. Third, the use of front-coating or film-applying technology to change the visual color by attaching a colored film to the front of the stone, but essentially changes the surface appearance rather than the color of the stone itself. Under backlighting conditions of translucent stone, the film color overlaps with the original color inside the stone after the light penetrates the stone, which exacerbates the color confusion and cannot solve the problem of uneven light transmission. Summary of the Invention

[0003] To address the aforementioned technical issues, this application provides a color-enhancing primer for stone, its preparation method, and its application.

[0004] In the first aspect, this application provides a base adhesive for enhancing the color of stone, employing the following technical solution: A color-enhancing base adhesive for stone is prepared from the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin 5-10 parts of waterborne epoxy resin 3-5 parts of tackifier 2-4 parts wetting agent 5-10 parts of crosslinking agent 2-3 parts antioxidant 4-6 parts of microsilica powder 1-3 parts of nano-vitrified microspheres 3-5 parts of nano calcium carbonate 0-10 parts of pigment Solvent 10-20 parts.

[0005] By employing the above technical solution, the color-enhancing primer is coated on the back of the stone to form a colored and optically uniform composite resin layer. The composite resin matrix is ​​constructed through the synergistic blending of water-based acrylic resin and water-based epoxy resin. The water-based acrylic resin imparts excellent flexibility, film-forming properties, and good wetting and penetration capabilities to the back of the stone, while the water-based epoxy resin provides high adhesion, chemical resistance, and a dense cross-linked network. The synergistic effect of these two components allows the primer to fully penetrate the micropores on the back of the stone and form an integral part of the stone after curing. Nano-calcium carbonate adjusts the rheological properties and optical refractive index of the system, while nano-vitrified microspheres utilize their unique light-scattering properties to convert incident directional backlight into uniform diffused light, reducing the light-transmitting blemishes caused by uneven mineral distribution within the stone. Simultaneously, pigments impart the target hue to the primer layer, ensuring that light passes through the uniformly colored primer layer before penetrating the stone, achieving an overall change in the stone's base color and a balanced visual color perception. The tackifier enhances the interfacial bonding strength between the primer and the back of the stone, the wetting agent ensures that the primer is evenly spread on the back of the stone without air bubbles, the crosslinking agent promotes the formation of a three-dimensional crosslinking network between acrylic and epoxy components to improve temperature resistance and mechanical strength, and the antioxidant reduces yellowing and aging of the primer layer. The components work together to form a dual bond of chemical bonding and physical anchoring between the primer layer and the stone, resulting in excellent weather resistance, light resistance and long-term color stability. It does not fade, peel, or migrate or seep out, and will not fade or peel after long-term use. It solves the technical defects of existing surface spraying, soaking dyeing and coating technologies, such as limited penetration, chaotic color and poor durability. It is especially suitable for large-area backlit decorative scenarios such as high-end translucent stone background walls, screens and ceilings.

[0006] Preferably, the solvent is an aqueous solvent, including at least one of water, alcohol solvents, and ether solvents.

[0007] Preferably, the alcohol solvent is ethanol and / or isopropanol.

[0008] Preferably, the ether solvent is ethylene glycol butyl ether or / and propylene glycol methyl ether.

[0009] Preferably, the antioxidant is prepared by the following method: 1) Mix nano-titanium dioxide, silane coupling agent and ethanol, reflux and heat, maintain the temperature at 50-60℃, filter and dry to obtain pretreated titanium dioxide; 2) Under ice-water bath conditions, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and dichloromethane were mixed, then diisopropylethylamine and pretreated titanium dioxide were added and stirred, and then 1-hydroxy-4-chlorobenzotriazole was added dropwise. During the dropwise addition, the temperature was kept below 2°C. The mixture was filtered, rinsed, and dried to obtain the antioxidant.

[0010] Preferably, the raw materials used to prepare the antioxidant are in the following weight proportions: 10-15 parts of nano titanium dioxide 1-2 parts of silane coupling agent 20-30 parts of ethanol 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid 3-4 parts 20-30 parts of dichloromethane 0.2-0.4 parts of diisopropylethylamine 0.5-1 part of 1-hydroxy-4-chlorobenzotriazole.

[0011] By adopting the above technical solution, nano-titanium dioxide is surface-modified with a silane coupling agent and then grafted with 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid through a 1-hydroxy-4-chlorobenzotriazole-catalyzed coupling reaction to prepare the substrate. Nano-titanium dioxide, as an inorganic UV shielding component, effectively absorbs and scatters ultraviolet light, preventing the photodegradation of organic resins and pigments in the primer layer. 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, as a hindered phenolic free radical scavenger, efficiently captures free radicals generated during thermo-oxidative aging of the primer layer, inhibiting the chain oxidation reaction. The two components are chemically bonded together. The organic-inorganic hybrid structure enables the antioxidant to have good dispersion stability and compatibility in the primer resin matrix, avoiding the defects of easy migration and precipitation of traditional physically blended antioxidants. At the same time, the introduction of silane coupling agent further enhances the interfacial bonding force between the antioxidant and waterborne acrylic resin and waterborne epoxy resin, so that the antioxidant functional components can exist stably in the primer layer for a long time and continue to play a role. This further improves the light resistance, heat and oxygen aging resistance and long-term color stability of the primer layer, ensuring that the stone color-enhancing primer does not yellow or fade under harsh use conditions such as outdoor use or strong light exposure, thus extending the service life of the primer layer and the overall stone decoration.

[0012] Preferably, the average particle size of the nano-vitrified microspheres is 100-500 nm, and the average particle size of the nano-calcium carbonate is 50-300 nm.

[0013] By adopting the above technical solution, the average particle size of nano-vitrified microspheres and nano-calcium carbonate is optimized, forming a particle size gradient combination. This improves the density and mechanical strength of the base layer, while adjusting the optical refractive index of the system to be similar to that of the stone minerals. This effectively eliminates the differences in light transmission intensity caused by uneven mineral distribution within the stone. It avoids the problems of insufficient light scattering efficiency and poor light uniformity caused by excessively small particle sizes, while also preventing the problems of decreased optical uniformity, increased surface roughness, and weakened interfacial bonding with the resin matrix caused by excessively large particle sizes. Thus, the base layer achieves excellent optical uniformity while maintaining high light transmittance, ensuring a soft and uniform visual effect for backlit stone, while maintaining good construction rheology and a strong bond with the back of the stone.

[0014] Preferably, the crosslinking agent is composed of an alicyclic amine curing agent and a blocked isocyanate curing agent in a weight ratio of 1:2-3.

[0015] By adopting the above technical solution, the cycloaliphatic amine curing agent provides rapid crosslinking and excellent epoxy curing characteristics, while the blocked isocyanate curing agent provides deep crosslinking in the later stage and enhances the acrylic resin. This allows the primer layer to form gradient crosslinking during the curing process. In the early stage, the cycloaliphatic amine achieves rapid shaping and basic strength establishment, while in the later stage, the blocking reaction of the blocked isocyanate achieves deep crosslinking and network perfection. Thus, while ensuring the workable time for construction, a highly dense three-dimensional network structure with uniform crosslinking density is ultimately formed, which greatly improves the weather resistance and mechanical strength of the primer layer. It effectively prevents the performance degradation of the primer layer due to swelling, hydrolysis, or thermal stress during long-term use, ensuring a long-term firm bond between the primer layer and the back of the stone, as well as the long-term stability of the optical homogenization function.

[0016] Preferably, the wetting agent is at least one selected from polyester-modified siloxane, fatty acid polyoxyethylene ester, and anionic surfactant.

[0017] By adopting the above technical solution, polyester-modified siloxane reduces the surface tension of the primer and improves its leveling properties, allowing the primer to fully spread and penetrate into the micropores on the back of the stone; fatty acid polyoxyethylene ester has both wetting and emulsifying functions, enhancing the compatibility between the primer and the stone interface; anionic surfactant provides excellent penetration and dispersion effects, ensuring that the nanofillers are uniformly dispersed without agglomeration. The synergistic effect of the three enables the primer to form a uniform coating on the back of the stone without bubbles or missed areas, ensuring the consistency of optical homogenization effect.

[0018] Preferably, the thickener is allyl glycidyl ether.

[0019] By adopting the above technical solutions, the interfacial bonding strength between the base adhesive and the back of the stone can be enhanced, the adhesion between the base adhesive layer and the stone can be improved, the base adhesive layer can be prevented from peeling or falling off, and the base adhesive layer can be ensured to adhere firmly to the back of the stone for a long time, thus guaranteeing the long-lasting stability of the color enhancement effect.

[0020] Preferably, the pigment is a modified metal complex dye or a modified azo dye.

[0021] By adopting the above technical solution, it has the characteristics of bright color, strong coloring power, fine particle size and good dispersibility. It can be evenly distributed in the base layer, giving the stone a soft and natural tone, while maintaining high light transmittance.

[0022] Secondly, this application provides a method for preparing a color-enhancing primer for stone, employing the following technical solution: A method for preparing a color-enhancing primer for stone includes the following preparation steps: Water-based acrylic resin, water-based epoxy resin, tackifier, wetting agent, crosslinking agent, antioxidant, microsilica powder, nano-vitrified microspheres, nano-calcium carbonate, pigment and solvent are stirred evenly to obtain a base adhesive for enhancing the color of stone.

[0023] By adopting the above technical solution, the base coat can be prepared by directly mixing and stirring water-based acrylic resin, water-based epoxy resin, functional fillers and additives. There is no need for complicated pre-reaction or multi-step synthesis process. The process is simple, convenient to operate, and has high production efficiency, making it easy to achieve large-scale industrial production. At the same time, this process ensures that each component is fully dispersed and evenly distributed in the water-based resin matrix under shear action, ensuring the uniformity and stability of the base coat system. It avoids the problems of local concentration differences and filler agglomeration caused by stepwise addition, thereby ensuring that the base coat forms a coating with consistent thickness, uniform optical properties and stable adhesion on the back of the stone, and fully exerts its color-enhancing and light-uniforming functions.

[0024] Thirdly, this application provides an application for a color-enhancing base adhesive for stone, employing the following technical solution: An application of a stone color-enhancing primer involves coating the stone color-enhancing primer described in the first aspect or the stone color-enhancing primer prepared in the second aspect onto the back of the stone, and then curing it to obtain the finished product.

[0025] By adopting the above technical solution, batches of stone with small color difference, uniform transparency and good weather resistance can be obtained.

[0026] In summary, this application has the following beneficial effects: Through the synergistic blending of water-based acrylic resin and water-based epoxy resin, excellent film-forming properties and high adhesion are achieved, allowing the primer to fully penetrate the micropores on the back of the stone and form a unified whole with the stone after curing. Nano-calcium carbonate effectively regulates the rheological properties and optical refractive index of the system, while nano-vitrified microspheres utilize their unique light scattering characteristics to convert incident directional backlight into uniform diffused light, reducing the light-transmitting blemishes caused by uneven mineral distribution within the stone. Simultaneously, pigments impart the target hue to the primer layer, ensuring that light is uniformly modulated by the colored primer layer before penetrating the stone, achieving an overall change in the stone's base color and a balanced visual color perception. Tackifiers enhance the interfacial bonding strength between the primer and the back of the stone, wetting agents ensure the primer spreads evenly on the back of the stone without air bubbles, and antioxidants effectively reduce yellowing and aging of the primer layer. The synergistic effect of each component enables the base coat to form a dual combination of chemical bonding and physical anchoring with the stone, resulting in excellent weather resistance, light resistance, and long-term color stability. It does not fade, peel, or migrate or seep out, thus solving the technical defects of existing surface spraying, soaking and dyeing, and coating technologies, such as limited surface effect, limited penetration, chaotic colors, and poor durability. It is especially suitable for large-area backlit decorative scenarios such as high-end translucent stone background walls, screens, and ceilings. Detailed Implementation Example The water-based acrylic resin is selected from product J-672 of Qingdao Jinwanli Fine Chemical Co., Ltd.

[0027] The waterborne epoxy resin was selected from Baling Petrochemical E-51.

[0028] The pigment is a modified metal complex dyeing agent, selected from SW-801 products of Suzhou Sanwei Dyestuff Chemical Co., Ltd.

[0029] Example 1 A color-enhancing primer for stone is prepared by the following method: Mix 400g of water-based acrylic resin, 50g of water-based epoxy resin, 30g of tackifier (allyl glycidyl ether), 20g of wetting agent, 50g of crosslinking agent, 10g of antioxidant (antioxidant 1010), 40g of microsilica powder, 10g of nano-vitrified microspheres, 30g of nano-calcium carbonate, 0.5g of pigment, and 100g of solvent (water and ethanol, volume ratio 3:7) until homogeneous to obtain a base adhesive for enhancing the color of stone.

[0030] The average particle size of the nano-vitrified microspheres is 100 nm, and the average particle size of the nano-calcium carbonate is 50 nm.

[0031] The crosslinking agent is composed of an alicyclic amine curing agent (isophorone diamine) and a blocked isocyanate curing agent (caprolactam-blocked HDI) in a weight ratio of 1:2.

[0032] The wetting agent is composed of polyester-modified siloxane (BYK-333), fatty acid polyoxyethylene ester (A-105), and anionic surfactant (Disponil SUS-87) in a weight ratio of 1:1:2.

[0033] Example 2 A color-enhancing primer for stone is prepared by the following method: Mix 500g of water-based acrylic resin, 80g of water-based epoxy resin, 40g of tackifier (allyl glycidyl ether), 30g of wetting agent, 80g of crosslinking agent, 25g of antioxidant (antioxidant 1010), 50g of microsilica powder, 20g of nano-vitrified microspheres, 40g of nano-calcium carbonate, 0.5g of pigment, and 150g of solvent (to ethanol, in a volume ratio of 3:7) until homogeneous to obtain a base adhesive for enhancing the color of stone.

[0034] The average particle size of the nano-vitrified microspheres is 300 nm, and the average particle size of the nano-calcium carbonate is 200 nm.

[0035] The crosslinking agent is composed of an alicyclic amine curing agent (isophorone diamine) and a blocked isocyanate curing agent (caprolactam-blocked HDI) in a weight ratio of 1:2.5.

[0036] The wetting agent is composed of polyester-modified siloxane (BYK-333), fatty acid polyoxyethylene ester (A-105), and anionic surfactant (Disponil SUS-87) in a weight ratio of 1:2:2.5.

[0037] Example 3 A color-enhancing primer for stone is prepared by the following method: Mix 600g of water-based acrylic resin, 100g of water-based epoxy resin, 50g of tackifier (allyl glycidyl ether), 40g of wetting agent, 100g of crosslinking agent, 30g of antioxidant (antioxidant 1010), 60g of microsilica powder, 30g of nano-vitrified microspheres, 60g of nano-calcium carbonate, 0.5g of pigment, and 200g of solvent (water and ethanol, volume ratio 3:7) until homogeneous to obtain a base adhesive for enhancing the color of stone.

[0038] The average particle size of the nano-vitrified microspheres is 500 nm, and the average particle size of the nano-calcium carbonate is 300 nm.

[0039] The crosslinking agent is composed of an alicyclic amine curing agent (isophorone diamine) and a blocked isocyanate curing agent (caprolactam-blocked HDI) in a weight ratio of 1:3.

[0040] The wetting agent is composed of polyester-modified siloxane (BYK-333), fatty acid polyoxyethylene ester (A-105), and anionic surfactant (Disponil SUS-87) in a weight ratio of 1:3:3.

[0041] Example 4 A color-enhancing primer for stone, the difference between this embodiment and Example 1 is that the antioxidant is prepared by the following method: 1) Mix 20g of nano titanium dioxide, 2g of silane coupling agent and 20g of ethanol, reflux and heat for 2h, maintain the temperature at 50℃, filter and dry to obtain pretreated titanium dioxide; 2) Under ice-water bath conditions, 6g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and 40g of dichloromethane were mixed, and then 0.4g of diisopropylethylamine and pretreated titanium dioxide were added and stirred. Then 1g of 1-hydroxy-4-chlorobenzotriazole was added dropwise, and the temperature was kept below 2°C during the dropwise addition. The mixture was filtered, rinsed, and dried to obtain the antioxidant.

[0042] Example 5 A color-enhancing primer for stone, the difference between this embodiment and Example 1 is that the antioxidant is prepared by the following method: 1) Mix 30g of nano titanium dioxide, 4g of silane coupling agent and 60g of ethanol, reflux and heat for 3h, maintain the temperature at 50℃, filter and dry to obtain pretreated titanium dioxide. 2) Under ice-water bath conditions, 8g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and 60g of dichloromethane were mixed, and then 0.8g of diisopropylethylamine and pretreated titanium dioxide were added and stirred. Then 2g of 1-hydroxy-4-chlorobenzotriazole was added dropwise, and the temperature was kept below 2°C during the dropwise addition. The mixture was filtered, rinsed, and dried to obtain the antioxidant.

[0043] Example 6 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the average particle size of the nano-vitrified microspheres is 50 nm and the average particle size of the nano-calcium carbonate is 50 nm.

[0044] Example 7 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the average particle size of the nano-vitrified microspheres is 100 nm and the average particle size of the nano-calcium carbonate is 300 nm.

[0045] Example 8 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the crosslinking agent is an alicyclic amine curing agent (isophorone diamine).

[0046] Example 9 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the crosslinking agent is a blocked isocyanate curing agent (caprolactam blocked HDI).

[0047] Example 10 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the wetting agent is composed of polyester modified siloxane (BYK-333) and fatty acid polyoxyethylene ester (A-105) in a weight ratio of 1:1.

[0048] Example 11 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the wetting agent is composed of polyester-modified siloxane (BYK-333) and anionic surfactant (Disponil SUS-87) in a weight ratio of 1:2.

[0049] Example 12 A base adhesive for enhancing the color of stone. The difference between this embodiment and Embodiment 1 is that the wetting agent is polyester-modified siloxane (BYK-333).

[0050] Comparative Example Comparative Example 1 A base adhesive for enhancing the color of stone. The difference between this comparative example and Example 1 is that the waterborne epoxy resin is replaced with an equal mass of waterborne polyurethane.

[0051] The waterborne polyurethane is selected from PU-919T product of Shanghai Bolino New Material Technology Co., Ltd.

[0052] Comparative Example 2 A color-enhancing base adhesive for stone is described. The difference between this comparative example and Example 1 is that the silica powder is replaced with an equal mass of talc powder.

[0053] Comparative Example 3 A color-enhancing primer for stone is described. The difference between this comparative example and Example 1 is that nano-vitrified microspheres are replaced with an equal mass of nano-silica.

[0054] Comparative Example 4 A base adhesive for enhancing the color of stone. The difference between this comparative example and Example 1 is that nano-calcium carbonate is replaced with an equal mass of nano-talc powder.

[0055] Comparative Example 5 A base adhesive for enhancing the color of stone. The difference between this comparative example and Example 1 is that no tackifier is added.

[0056] Detection methods / test methods Light transmission uniformity: Take the same piece of translucent stone with natural color difference and cut it into 18 samples of the same size. Select one stone as a blank control and leave its back untreated. Apply color-enhancing base adhesive to the back of the other 17 stones. After curing, the thickness is 0.5mm. Place the samples above the same LED backlight (color temperature 4000K, illuminance 5000lux). Set up a CCD camera 1m in front of the sample to take light transmission images. Use ImageJ image analysis software to analyze the grayscale values ​​of the light transmission images and calculate the light transmission uniformity coefficient. U = (1 - σ / μ) * 100% σ is the standard deviation of grayscale values, and μ is the average grayscale value. The closer the U value is to 100%, the more uniform the light transmission.

[0057] Color difference improvement test: 1) Select stone slabs from the same batch that have obvious natural color differences. Select one stone as a blank control and coat the back of the other stone with color-enhancing base adhesive. After curing, the thickness is 0.5mm. Prepare the sample according to the sampling requirements of GB / T 13891-2008 "Determination of Specular Gloss of Building Facing Materials". Arrange 9 measurement points on the front of the stone using a grid method (3×3 array, edge distance from the edge of the slab is 30mm, and the point spacing is about 80mm). Using a spectrophotometer (such as X-Rite Ci7800) under D65 standard light source and 10° field of view, the Lab* color values ​​of each area on the front of the stone were measured, and the maximum color difference between the nine measuring points of each sample was calculated. Aging resistance: According to ASTM G154, UVA-340 lamp tube, 8h UV (60℃) + 4h condensation (50℃) cycle for 500h, then perform color difference improvement test.

[0058] Adhesion test: Referring to GB / T 5210-2006 "Paints and Varnishes - Pull-off test for adhesion", a standard pull-out head was adhered to the surface of the primer layer. A pull-out tester was used to vertically pull the surface at a rate of 10 mm / min, and the maximum tensile force at failure was recorded. The experimental results are shown in Table 1. Table 1. Experimental data of Examples 1-12 and Comparative Examples 1-5

[0059] Based on the experimental data above, it can be seen that by using water-based acrylic resin, water-based epoxy resin, tackifier, wetting agent, crosslinking agent, antioxidant, microsilica powder, nano-vitrified microspheres, nano-calcium carbonate and pigments in combination, the color difference and light transmission unevenness between different batches of boards can be reduced, and the color retention time can be improved without peeling.

[0060] Comparing Example 1 with Comparative Examples 1-4, it is evident that the present application can significantly improve the overall effects of the primer, such as color enhancement, gloss uniformity, adhesion, and durability, through the synergistic effect of waterborne acrylic resin, waterborne epoxy resin, microsilica powder, nano-vitrified microspheres, and nano-calcium carbonate.

[0061] A comparison of Example 1 with Examples 4-5 demonstrates that the antioxidant prepared by the method described in this application can further improve the color difference improvement effect and aging resistance of the primer.

[0062] Comparing Examples 1 and 6-12, it is shown that optimizing the average particle size of the nano-vitrified microspheres and nano-calcium carbonate, the amount and type of crosslinking agent, and the amount and type of wetting agent further improves the color difference improvement effect, aging resistance, and bonding stability of the primer.

[0063] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A base adhesive for enhancing the color of stone, characterized in that, It is prepared from the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin 5-10 parts of waterborne epoxy resin 3-5 parts of tackifier 2-4 parts wetting agent 5-10 parts of crosslinking agent 2-3 parts antioxidant 4-6 parts of microsilica powder 1-3 parts of nano-vitrified microspheres 3-5 parts of nano calcium carbonate 0-10 parts of pigment Solvent 10-20 parts.

2. The stone color-enhancing primer according to claim 1, characterized in that, The antioxidant is prepared by the following method: 1) Mix nano-titanium dioxide, silane coupling agent and ethanol, reflux and heat, maintain the temperature at 50-60℃, filter and dry to obtain pretreated titanium dioxide; 2) Under ice-water bath conditions, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and dichloromethane were mixed, then diisopropylethylamine and pretreated titanium dioxide were added and stirred, and then 1-hydroxy-4-chlorobenzotriazole was added dropwise. During the dropwise addition, the temperature was kept below 2°C. The mixture was filtered, rinsed, and dried to obtain the antioxidant.

3. The color-enhancing primer for stone according to claim 2, characterized in that, The raw materials used to prepare the antioxidant are as follows by weight: 10-15 parts of nano titanium dioxide 1-2 parts of silane coupling agent 20-30 parts of ethanol 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid 3-4 parts 20-30 parts of dichloromethane 0.2-0.4 parts of diisopropylethylamine 0.5-1 part of 1-hydroxy-4-chlorobenzotriazole.

4. The stone color-enhancing primer according to claim 1, characterized in that: The average particle size of the nano-vitrified microspheres is 100-500 nm, and the average particle size of the nano-calcium carbonate is 50-300 nm.

5. The stone color-enhancing primer according to claim 1, characterized in that: The crosslinking agent is composed of an alicyclic amine curing agent and a blocked isocyanate curing agent in a weight ratio of 1:2-3.

6. The color-enhancing primer for stone according to claim 1, characterized in that: The wetting agent is composed of polyester-modified siloxane, fatty acid polyoxyethylene ester and anionic surfactant in a weight ratio of 1:1-3:2-3.

7. The color-enhancing primer for stone according to claim 1, characterized in that: The thickener is allyl glycidyl ether.

8. The color-enhancing primer for stone according to claim 1, characterized in that: The pigment is a modified metal complex dye or a modified azo dye.

9. A method for preparing a stone color-enhancing primer as described in any one of claims 1-7, characterized in that, The preparation steps include the following: Water-based acrylic resin, water-based epoxy resin, tackifier, wetting agent, crosslinking agent, antioxidant, microsilica powder, nano-vitrified microspheres, nano-calcium carbonate, pigment and solvent are stirred evenly to obtain a base adhesive for enhancing the color of stone.

10. An application of a color-enhancing primer for stone, characterized in that: Apply the stone color-enhancing primer according to any one of claims 1-8 or the stone color-enhancing primer prepared according to claim 9 to the back of the stone, and cure to obtain the finished product.

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