Artificial stone plate for outer wall and preparation method of artificial stone plate

Abstract

The invention discloses an artificial stone plate for an outer wall and a preparation method of the artificial stone plate, and relates to the field of artificial stone plates, and the preparation method of the artificial stone plate for the outer wall comprises the steps of artificial stone base material surface treatment, silane coupling agent spraying, primer spraying, pattern printing with ink, finish-coat paint spraying and the like. A connecting layer, a transition layer, a pattern decoration layer and a cover surface protection layer are sequentially arranged on the surface of the artificial stone base material; the bonding strength, weather resistance and other properties between the artificial stone base material and the primer are improved through the connecting layer; the color of the artificial stone base material is covered by the transition layer to form a ground color, so that color development of the pattern decoration layer is facilitated. Through cooperation of the connecting layer and the transition layer, the transition layer has good adhesive force, can be attached to the artificial stone base material and can be connected with the pattern decoration layer, the stain resistance and aging resistance of the artificial stone plate can be enhanced, and the artificial stone plate can adapt to the outdoor use environment; and the problems of pattern distortion and color fading of the artificial stone plate due to an outdoor use environment are avoided.

Description

Technical Field

[0001] The invention relates to the field of artificial stone plates, and in particular to an artificial stone plate for exterior walls and a preparation method thereof. Background Art

[0002] Stone is divided into natural stone and artificial stone. With the vigorous development of the construction industry, the amount of stone used is growing. Natural stone is a non-renewable resource and has been mined on a large scale. The natural stone suitable for building decoration panels is gradually depleted. In addition, natural stone has radiation, which affects human health and is difficult to process. The construction and decoration industry has begun to use artificial stone to replace natural stone.

[0003] Artificial stone panels in the prior art are made by pressing, and the panels have a full-body effect. However, the existing artificial stone panels mainly form corresponding decorative effects by matching different particles with each other, and the surface decorative effect is relatively monotonous, and the expression of textures and patterns is poor. Summary of the invention

[0004] The purpose of the present invention is to provide an artificial stone plate for exterior walls and a preparation method thereof, so as to solve the problem that the surface decoration effect of the artificial stone plate is relatively monotonous.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preparing an artificial stone plate for an exterior wall, comprising the following steps:

[0007] S1: mixing artificial stone raw materials and pressing and molding to obtain an artificial stone substrate;

[0008] S2: performing surface treatment on the surface of the artificial stone substrate to obtain a substrate to be sprayed;

[0009] S3: spraying a silane coupling agent on the surface of the substrate to be sprayed and drying the silane coupling agent to form a connecting layer on the surface of the substrate to be sprayed, thereby obtaining an artificial stone substrate with a connecting layer;

[0010] S4: spraying a primer on the surface of the artificial stone substrate with the connecting layer, and after the first surface drying, forming a transition layer on the surface of the connecting layer to obtain an artificial stone substrate with a base color;

[0011] S5: using inorganic ink to print a pattern on the surface of an artificial stone substrate having a base color, and after a second surface drying, forming a pattern decoration layer on the surface of the transition layer to obtain an artificial stone substrate with a pattern;

[0012] S6: spraying a finishing paint on the surface of the patterned artificial stone substrate, and after the surface is dried for the third time, forming a finishing layer on the surface of the patterned decorative layer to obtain an artificial stone plate for exterior wall.

[0013] In the method for preparing the artificial stone plate for exterior wall, in step S2, the surface treatment includes:

[0014] Sanding the surface of the artificial stone substrate;

[0015] Use filling materials to fill the holes on the surface of the artificial stone substrate.

[0016] In the method for preparing the artificial stone plate for exterior wall, the filling material is putty powder and / or atomic ash.

[0017] In the preparation method of the artificial stone plate for exterior wall, the primer is a two-component epoxy white primer, including a main paint and a curing agent. The main paint includes the following components calculated by weight: 38 to 45 parts of epoxy resin, 10 to 12 parts of polyamide resin, 12 to 18 parts of titanium dioxide, 0.5 to 1 part of auxiliary agent and 12 to 15 parts of solvent; the primer includes 18 to 22 parts of curing agent calculated by weight;

[0018] The curing agent includes an amine curing agent, the auxiliary agent includes one of an organosilicon leveling agent and a polyether defoaming agent; and the solvent includes one of acetone, xylene, toluene and butyl acetate.

[0019] In the method for preparing the artificial stone plate for exterior wall, in step S5, the inorganic ink comprises the following components in parts by weight:

[0020] 5 to 10 parts of epoxy resin, 10 to 20 parts of fluorocarbon resin, 15 to 25 parts of polyurethane acrylic resin, 5 to 10 parts of polymer monomers, 20 to 30 parts of inorganic pigments and 20 to 30 parts of diluents; the polymer monomers include methacrylate and / or hydroxy acrylate.

[0021] In the preparation method of the artificial stone board for exterior wall, in the step S3, the drying temperature of the silane coupling agent is 80-90°C, and the drying time is 1-2h; in the step S4, the temperature of the first surface drying is 80-85°C, and the first surface drying time is 30-45h; in the step S5, the temperature of the second surface drying is 80-85°C, and the second surface drying time is 1-2h; in the step S6, the temperature of the third surface drying is 80-85°C, and the third surface drying time is 2-3h.

[0022] In the method for preparing the artificial stone plate for exterior wall, in step S3, the amount of the silane coupling agent is 20 to 30 g / m 2 .

[0023] In the method for preparing the artificial stone plate for exterior wall, in step S4, the amount of the primer is 20-30 g / m 2 .

[0024] The present invention also provides an artificial stone plate for exterior walls, which is prepared by the above-mentioned method for preparing the artificial stone plate for exterior walls.

[0025] A technical solution in the present invention can have the following beneficial effects:

[0026] The preparation method of the artificial stone plate for exterior wall changes the base color of the artificial stone plate by setting the transition layer, reduces the processing requirements of the raw materials of the artificial stone plate, does not require special color matching, and the artificial stone plate can be mixed with materials of different sizes and colors under the requirements of physical properties. In addition, the connection layer can enhance the adhesion of the primer and the pattern decoration layer, and the inorganic ink used in the pattern decoration layer also has the performance of anti-aging. When combined with the topcoat layer, the anti-fouling performance and anti-aging performance of the artificial stone plate can be enhanced, so that the artificial stone plate can adapt to the outdoor use environment, and avoid the problem of pattern distortion and fading of the artificial stone plate when it is exposed to the sun, strong wind or rain outdoors; in addition, the use of inorganic ink for ink printing can simulate the texture and pattern of natural stone, and the pattern design can be carried out according to personalization, and the decorative effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an appearance diagram of Example 1 after artificial weathering resistance and gloss loss tests in the present invention;

[0028] Figure 2 This is an appearance diagram of a comparative example after artificial weathering resistance and gloss loss tests in the present invention. DETAILED DESCRIPTION

[0029] The technical scheme of the present invention is further illustrated by specific embodiments below. In order to facilitate understanding of the present invention, the present invention is described more comprehensively below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

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

[0032] The present invention provides a method for preparing an artificial stone plate for an exterior wall, comprising the following steps:

[0033] S1: mixing artificial stone raw materials and pressing and molding to obtain an artificial stone substrate;

[0034] S2: performing surface treatment on the surface of the artificial stone substrate to obtain a substrate to be sprayed;

[0035] S3: spraying a silane coupling agent on the surface of the substrate to be sprayed and drying the silane coupling agent to form a connecting layer on the surface of the substrate to be sprayed, thereby obtaining an artificial stone substrate with a connecting layer;

[0036] S4: spraying a primer on the surface of the artificial stone substrate with the connecting layer, and after the first surface drying, forming a transition layer on the surface of the connecting layer to obtain an artificial stone substrate with a base color;

[0037] S5: using inorganic ink to print a pattern on the surface of an artificial stone substrate having a base color, and after a second surface drying, forming a pattern decoration layer on the surface of the transition layer to obtain an artificial stone substrate with a pattern;

[0038] S6: spraying a finishing paint on the surface of the patterned artificial stone substrate, and after the surface is dried for the third time, forming a finishing layer on the surface of the patterned decorative layer to obtain an artificial stone plate for exterior wall.

[0039] The preparation method of the artificial stone plate for exterior wall comprises the steps of treating the surface of the artificial stone substrate, spraying a silane coupling agent, spraying a primer, printing a pattern with ink, and spraying a topcoat, and sequentially arranging a connection layer, a transition layer, a pattern decoration layer, and a topcoat protection layer on the surface of the artificial stone substrate; the connection layer is used to improve the bonding strength, water resistance, and weather resistance between the artificial stone substrate and the primer; and the transition layer is used to cover the color of the artificial stone substrate to form a base color, which is more conducive to the color development of the pattern decoration layer. The cooperation of the connection layer and the transition layer enables the transition layer to have good adhesion, be able to adhere to the artificial stone substrate, and be able to connect the pattern decoration layer. In addition, a topcoat layer is arranged on the surface of the pattern decoration layer to protect the pattern decoration layer from being easily damaged.

[0040] The preparation method of the artificial stone plate for exterior wall changes the base color of the artificial stone plate by setting the transition layer, reduces the processing requirements of the raw materials of the artificial stone plate, does not require special color matching, and the artificial stone plate can be mixed with materials of different sizes and colors under the requirements of physical properties. In addition, the connection layer can enhance the adhesion of the primer and the pattern decoration layer, and the inorganic ink used in the pattern decoration layer also has the performance of anti-aging. When combined with the topcoat layer, the anti-fouling performance and anti-aging performance of the artificial stone plate can be enhanced, so that the artificial stone plate can adapt to the outdoor use environment, and avoid the problem of pattern distortion and fading of the artificial stone plate when it is exposed to the sun, strong wind or rain outdoors; in addition, the use of inorganic ink for ink printing can simulate the texture and pattern of natural stone, and the pattern design can be carried out according to personalization, and the decorative effect is better.

[0041] The silane coupling agent includes an amino-based silane coupling agent and / or an epoxy-based silane coupling agent.

[0042] Specifically, in step S2, the surface treatment includes:

[0043] Sanding the surface of the artificial stone substrate;

[0044] Use filling materials to fill the holes on the surface of the artificial stone substrate.

[0045] Sanding can make the surface of the artificial stone substrate smooth and uniform, remove the flaws and unevenness on the surface of the artificial stone substrate, and remove the protruding artificial stone raw materials from the rough surface to ensure the quality and appearance of the final product. Subsequently, the holes on the surface of the artificial stone substrate are filled with filling materials to avoid the appearance of concave holes on the surface of the artificial stone substrate, which affects the appearance and decorative effect of subsequent products.

[0046] By adopting the above steps, the surface of the artificial stone substrate can be ensured to be smooth, and the unevenness of the artificial stone substrate can be prevented from affecting the printing effect of the inorganic ink, thereby avoiding affecting the appearance and decorative effect of subsequent products.

[0047] Specifically, the filling material is putty powder and / or atomic putty.

[0048] The main components of putty powder are talcum powder and glue, which are inorganic filling materials. Atomic putty is also called unsaturated polyester resin putty. Unsaturated polyester resin is the main body of atomic putty, which is an organic filling material. It polymerizes after initiation, quickly forms and solidifies, and adheres to the surface of the object.

[0049] By using the filling material, the holes on the surface of the artificial stone substrate can be quickly filled, making the surface of the artificial stone substrate smooth.

[0050] Specifically, the primer is a two-component epoxy white primer, including a main paint and a curing agent. The main paint, calculated by weight, includes the following components: 38 to 45 parts of epoxy resin, 10 to 12 parts of polyamide resin, 12 to 18 parts of titanium dioxide, 0.5 to 1 part of auxiliary agent and 12 to 15 parts of solvent; the primer, calculated by weight, includes 18 to 22 parts of the curing agent.

[0051] The curing agent includes an amine curing agent, the auxiliary agent includes one or two of an organosilicon leveling agent and a polyether defoaming agent; and the solvent includes one of acetone, xylene, toluene and butyl acetate.

[0052] In a specific application, the curing agent is one of ethylenediamine, cyclohexylamine and polyetheramine.

[0053] Artificial stone substrates contain a large amount of silicates. When silicates encounter water vapor in the air or walls, they undergo hydrolysis reactions. The generated hydroxyl radicals combine with metal ions to form hydroxides with lower solubility. Hydroxides are alkaline. When the temperature rises, water vapor evaporates, and hydroxides are precipitated from the wall. As the water gradually evaporates, hydroxides are precipitated on the surface of the artificial stone substrate. Over time, the original decorative coatings or paints are lifted up and no longer adhere to the wall, resulting in whitening, peeling, and shedding. This process is called alkali efflorescence.

[0054] The main body of the main paint is epoxy resin and polyamide resin, which belongs to the film-forming and curing of the multi-phase system. When mixed with the curing agent, it is tightly and firmly formed after curing. The epoxy group of the epoxy resin can also react with the alkaline substances in the artificial stone substrate, effectively preventing the migration of salts and alkaline substances in the artificial stone substrate. Therefore, through the reaction of the active functional groups of the epoxy resin and the surface coupling agent of the substrate with the precipitated substances such as hydroxide, it plays a role in sealing the moisture absorbed from the outside and the migration of internal moisture. Moreover, the transition layer can reduce the alkali phenomenon of the artificial stone substrate when used outdoors, thereby delaying the shedding of the pattern decoration layer. The transition layer plays the role of connecting the pattern decoration layer and the connecting layer. At the same time, the epoxy resin contains hydroxyl groups, which can form hydrogen bonds in the primer layer, thereby increasing the sealing and adhesion of the pattern decoration layer.

[0055] Epoxy resin and polyamide resin have similar active functional groups to amino silane coupling agents and epoxy silane coupling agents, which makes the main paint and curing agent react more fully. Since silane coupling agent is a transparent liquid, it will not affect the color of the substrate after being applied on the surface of the substrate. If it is directly printed, the color of the artificial stone substrate and the color of the ink will be superimposed, which will cause color difference. Therefore, using titanium dioxide as a whitening agent to make the transition layer white can enhance the color printing effect and avoid the problem of color difference.

[0056] When spraying primer, spray the main paint first. After the main paint is completely sprayed, spray the curing agent.

[0057] Specifically, in step S5, the inorganic ink comprises the following components in parts by weight:

[0058] 5 to 10 parts of epoxy resin, 10 to 20 parts of fluorocarbon resin, 15 to 25 parts of polyurethane acrylic resin, 5 to 10 parts of polymer monomers, 20 to 30 parts of inorganic pigments and 20 to 30 parts of diluents; the polymer monomers include methacrylate and / or hydroxy acrylate.

[0059] The inorganic ink has good aging resistance and belongs to a non-burning ink. It can be cured by heating or naturally curing and has good stain resistance. It is compatible with the transition layer of this patent and will not have the phenomenon of blooming. Through the above components, the situation that the primer and the inorganic ink are not well matched, causing the ink to diffuse laterally, can be avoided, thereby avoiding the problem of blurred and distorted patterns. Inorganic pigments can be seen in the pigments of existing inkjet printing inks, and can be selected according to specific needs. The polymer monomer plays a role in improving the wettability of the surface of the color filler, and prevents the problem of blooming in the pattern after spraying the topcoat. The diluent is an ether ester diluent. In a specific application, the diluent includes one of ethylene glycol monoethyl ether, ethylene glycol propyl ether and ethylene glycol butyl ether. The types of inorganic pigments include one or more of titanium white, chrome yellow, iron blue, cadmium red, cadmium yellow, carbon black, iron oxide red and iron oxide yellow.

[0060] Specifically, in the step S3, the drying temperature of the silane coupling agent is 80-90°C, and the drying time is 1-2h; in the step S4, the temperature of the first surface drying is 80-85°C, and the first surface drying time is 30-45h; in the step S5, the temperature of the second surface drying is 80-85°C, and the second surface drying time is 1-2h; in the step S6, the temperature of the third surface drying is 80-85°C, and the third surface drying time is 2-3h.

[0061] The above-mentioned drying temperature can ensure that the silane coupling agent is completely dried and forms a connecting layer. Similarly, the above-mentioned first surface drying temperature, second surface drying temperature and third surface drying temperature can ensure that the surfaces of the primer, printing ink and topcoat are completely dry, avoiding the problem of printing ink deviation.

[0062] Specifically, in step S3, the thickness of the connecting layer is 26 to 30 μm. In a specific embodiment of the present invention, the silane coupling agent is diluted by 1% to 3% before spraying, and then sprayed after dilution. The amount of the diluted silane coupling agent is 30 to 50 g / m 2 .

[0063] The above dosage can ensure that a connection layer of sufficient thickness is formed on the surface of the artificial stone base. 2 When the connection layer is too thin, it cannot enhance the adhesion. When the amount of silane coupling agent is greater than 50 / m 2 When the silane coupling agent is used excessively, it will cause waste and increase production costs.

[0064] Specifically, in step S4, the thickness of the primer is 36-40 um.

[0065] In a specific embodiment of the present invention, the amount of primer used is 125-135 g / m 2 The above dosage can ensure that a transition layer of sufficient thickness is formed on the surface of the connecting layer. When the amount of primer is less than 125 / m 2 When the amount of primer is greater than 135 / m 2 When the primer is used excessively, it will cause waste and increase production costs.

[0066] The present invention also provides an artificial stone plate for exterior walls, which is prepared by the above-mentioned method for preparing the artificial stone plate for exterior walls.

[0067] The artificial stone slab for exterior wall is prepared by the above-mentioned preparation method, and can simulate the texture and pattern of natural stone. At the same time, the pattern can be designed according to personalization, and the decorative effect is better. In addition, it has good stain resistance and aging resistance, and can adapt to outdoor use environment, avoiding the problem of pattern distortion, fading, and even shedding of the pattern decorative layer of the artificial stone slab due to exposure, strong wind or rain erosion outdoors.

[0068] Example Group A

[0069] A method for preparing an artificial stone plate for an exterior wall comprises the following steps:

[0070] Mixing artificial stone raw materials and pressing them into shape to obtain an artificial stone substrate;

[0071] The surface of the artificial stone substrate is subjected to surface treatment, wherein the surface treatment comprises: sanding the surface of the artificial stone substrate; filling holes on the surface of the artificial stone substrate with putty powder; and obtaining a substrate to be sprayed;

[0072] Spraying a silane coupling agent on the surface of the substrate to be sprayed and drying the agent to form a connecting layer on the surface of the substrate to be sprayed, thereby obtaining an artificial stone substrate with a connecting layer;

[0073] The primer is sprayed on the surface of the artificial stone substrate with the connecting layer, and after the surface is dried for the first time, a transition layer is formed on the surface of the connecting layer to obtain an artificial stone substrate with a base color;

[0074] A pattern is printed on the surface of an artificial stone substrate having a base color using an inorganic ink, and after the surface is dried for the second time, a pattern decoration layer is formed on the surface of the transition layer to obtain an artificial stone substrate with a pattern;

[0075] A finishing paint is sprayed on the surface of the patterned artificial stone substrate, and after the surface is dried for the third time, a finishing layer is formed on the surface of the patterned decorative layer to obtain an artificial stone plate for exterior walls.

[0076] Among them, the main paint components and the components of the inorganic ink in the primer are shown in Table 1. The specific parameters are shown in Table 2.

[0077] Table 1 - Main paint components and inorganic ink components in primer

[0078]

[0079] The solvent of Examples 1 and 2 is acetone, the auxiliary agent is an organosilicon leveling agent, the curing agent is ethylenediamine, and the diluent is ethylene glycol monoethyl ether. The solvent of Examples 3 and 4 is toluene, the auxiliary agent is an organosilicon leveling agent and a polyether defoaming agent, the curing agent is cyclohexylamine, and the diluent is ethylene glycol propyl ether.

[0080] Table 2-Specific parameters

[0081]

[0082] Comparative Example 1

[0083] The specific parameters and inorganic ink components of Comparative Example 1 are the same as those of Example 1, except that the silane coupling agent and primer are not sprayed, and the pattern is directly printed on the surface of the artificial stone substrate using inorganic ink. The temperature and time of the second surface drying are the same as those of Example 1. The temperature and time of the third surface drying are the same as those of Example 1.

[0084] Comparative Example 2

[0085] The specific parameters and inorganic ink components of Comparative Example 2 are the same as those of Example 1, except that the primer is not sprayed, and the pattern is directly printed on the surface of the connecting layer using inorganic ink. The drying temperature and time, the temperature and time of the second surface drying are the same as those of Example 1, and the temperature and time of the third surface drying are the same as those of Example 1.

[0086] Comparative Example 3

[0087] The specific parameters and steps of Comparative Example 3 are the same as those of Example 1, except that the pattern is printed using UV curable ink, and the UV curable ink is irradiated by a UV lamp to react and cure the active free radicals in the ink with the resin to form a pattern decoration layer. The steps for forming the overcoat layer are the same as those of Example 1.

[0088] The artificial stone plates obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were subjected to artificial weathering aging resistance and gloss loss tests and acid and alkali resistance tests, and the pattern clarity of the artificial stone plates was observed.

[0089] Performance Testing

[0090] 1. Artificial weathering and gloss loss test

[0091] Reference standard GB / T 1865-2009, test conditions are as follows:

[0092] Test temperature: 38℃;

[0093] Test humidity: 50%;

[0094] Test irradiation intensity: 0.51W / m2 (340nm) or 50W / m2 (300-400nm);

[0095] Blackboard temperature: 63°C;

[0096] Test procedure: 18 minutes of spraying followed by 102 minutes of continuous lighting.

[0097] The test results of each embodiment and comparative example are shown in Table 3, wherein the evaluation grade standards are as follows:

[0098] A is good, that is, there is no blistering, peeling, cracking, or yellowing on the surface;

[0099] B is fair, with a small amount of blistering, peeling and cracking, and slight yellowing;

[0100] C is poor, with a lot of blistering, peeling and cracking, and obvious yellowing.

[0101] Table 3: Test results of artificial weathering resistance and gloss loss of various embodiments and comparative examples

[0102] sample 300h 700h 1100h 1500h Example 1 A A A A Example 2 A A A A Example 3 A A A A Example 4 A A A A Comparative Example 1 B B C C Comparative Example 2 B C C C Comparative Example 3 B C C C

[0103] 2. Acid and alkali resistance test

[0104] Refer to GB / T 9265-2009, the test time is 168 hours, and the paint film is damaged. The test results are shown in Table 4.

[0105] Table 4 - Acid and alkali resistance test results of each embodiment and comparative example

[0106]

[0107]

[0108] 3. Pattern clarity

[0109] Observe the accuracy of the sample pattern and whether it is clear. The observation results are shown in Table 5.

[0110] Table 5 - Clarity results of various embodiments and comparative examples

[0111] sample Is it clear? Example 1 yes Example 2 yes Example 3 yes Example 4 yes Comparative Example 1 Yes, but there is a color difference problem Comparative Example 2 Yes, but there is a color difference problem Comparative Example 3 no

[0112] By comparing Comparative Example 1, Comparative Example 2 and Example 1, the lack of a transition layer makes it easy for the base color of the artificial stone plate to affect the color development effect of the ink, resulting in color difference problems, and the lack of a transition layer and a connecting layer significantly weakens the adhesion.

[0113] By comparing Comparative Example 3 with Example 1, UV ink can be cured by UV lamp with high curing efficiency and bright and delicate patterns, but it has the problem of poor aging resistance and is not suitable for outdoor use.

[0114] 4. Wet-dry cycle test

[0115] The artificial stone plates of Example 1 and the comparative examples were immersed in water at room temperature for 18 hours, and then placed in a 60°C oven for heating for 6 hours. The immersion at room temperature for 18 hours and the oven heating for 6 hours were considered as one cycle. The cycle was repeated 7 times, and the conditions of the artificial stone plates were observed. The observation results are shown in Table 6, where the evaluation grade standards are as follows:

[0116] A is good, that is, there is no blistering, peeling, cracking, or yellowing on the surface;

[0117] B is fair, with a small amount of blistering, peeling and cracking, and slight yellowing;

[0118] C is poor, with a lot of blistering, peeling and cracking, and obvious yellowing.

[0119] Table 6 - Clarity results of Example 1 and Comparative Examples

[0120] sample Is it clear? Example 1 yes Comparative Example 1 Yes, but there is a color difference problem Comparative Example 2 Yes, but there is a color difference problem Comparative Example 3 no

[0121] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific embodiments of the present invention without creative work, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for preparing an artificial stone plate for exterior wall, characterized in that: The following steps are involved: S1: mixing artificial stone raw materials and pressing and molding to obtain an artificial stone substrate; S2: performing surface treatment on the surface of the artificial stone substrate to obtain a substrate to be sprayed; S3: spraying a silane coupling agent on the surface of the substrate to be sprayed and drying the silane coupling agent to form a connecting layer on the surface of the substrate to be sprayed, thereby obtaining an artificial stone substrate with a connecting layer; S4: spraying a primer on the surface of the artificial stone substrate with the connecting layer, and after the first surface drying, forming a transition layer on the surface of the connecting layer to obtain an artificial stone substrate with a base color; S5: using inorganic ink to print a pattern on the surface of an artificial stone substrate having a base color, and after a second surface drying, forming a pattern decoration layer on the surface of the transition layer to obtain an artificial stone substrate with a pattern; S6: spraying a finishing paint on the surface of the patterned artificial stone substrate, and after the surface is dried for the third time, forming a finishing layer on the surface of the patterned decorative layer to obtain an artificial stone plate for exterior wall.

2. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: In the step S2, the surface treatment includes: Sanding the surface of the artificial stone substrate; Use filling materials to fill the holes on the surface of the artificial stone substrate.

3. The method for preparing an artificial stone plate for exterior wall according to claim 2, characterized in that: The filling material is putty powder and / or atomic putty.

4. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: The primer is a two-component epoxy white primer, including a main paint and a curing agent. The main paint includes the following components by weight: 38 to 45 parts of epoxy resin, 10 to 12 parts of polyamide resin, 12 to 18 parts of titanium dioxide, 0.5 to 1 part of auxiliary agent and 12 to 15 parts of solvent; the primer includes 18 to 22 parts of curing agent by weight. The curing agent includes an amine curing agent, the auxiliary agent includes one of an organosilicon leveling agent and a polyether defoaming agent; and the solvent includes one of acetone, xylene, toluene and butyl acetate.

5. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: In the step S5, the inorganic ink comprises the following components in parts by weight: 5 to 10 parts of epoxy resin, 10 to 20 parts of fluorocarbon resin, 15 to 25 parts of polyurethane acrylic resin, 5 to 10 parts of polymer monomers, 20 to 30 parts of inorganic pigments and 20 to 30 parts of diluents; the polymer monomers include methacrylate and / or hydroxy acrylate.

6. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: In the step S3, the drying temperature of the silane coupling agent is 80-90°C, and the drying time is 1-2h; in the step S4, the temperature of the first surface drying is 80-85°C, and the first surface drying time is 30-45h; in the step S5, the temperature of the second surface drying is 80-85°C, and the second surface drying time is 1-2h; in the step S6, the temperature of the third surface drying is 80-85°C, and the third surface drying time is 2-3h.

7. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: In the step S3, the thickness of the connection layer is 26-30 um.

8. The method for preparing an artificial stone plate for exterior wall according to claim 1, characterized in that: In the step S4, the thickness of the primer is 36-40 um.

9. An artificial stone plate for exterior wall, characterized in that: The artificial stone plate for exterior wall is prepared by the method for preparing the artificial stone plate for exterior wall as claimed in any one of claims 1 to 8.

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