Inorganic stone with granite texture and method for preparing the same

Abstract

This invention discloses an inorganic stone with a granite-like texture and its preparation method, belonging to the field of building materials technology. The modified reinforcing fibers of this invention have higher surface active sites, effectively enhancing the interfacial bonding force between the modified reinforcing fibers and the inorganic matrix. By compounding polyvinyl alcohol fibers, silicon carbide fibers, and basalt fibers of different grades, a multi-layered, multi-dimensional spatial network structure is constructed in the matrix, working synergistically to achieve significant reinforcement. This invention uses butylated hydroxytoluene and nano-titanium dioxide to modify styrene-butadiene emulsion, improving the compatibility of the modified styrene-butadiene emulsion with inorganic hydration products. The organic-inorganic interpenetrating network structure formed after curing further enhances the toughness and impermeability of the inorganic stone. Overall, it yields a dense, smooth, low-water-absorption, high-gloss, and mechanically excellent granite-like inorganic stone, meeting the requirements for high-performance environmentally friendly imitation stone materials.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically, to an inorganic stone with a granite-like texture and its preparation method. Background Technology

[0002] Granite, as a natural decorative stone, is widely used in interior and exterior wall and floor decoration due to its rich textures, vibrant colors, high hardness, and good wear resistance. However, natural granite has the following problems: 1. Some varieties have high radiation levels, making them unsuitable for indoor environments, especially living spaces; 2. Resources are limited, resulting in high mining and processing costs; 3. Texture and color are limited by natural formation conditions, leading to poor batch-to-batch consistency; 4. It has a high water absorption rate, making it susceptible to staining and exhibiting poor freeze-thaw durability. These limitations restrict its application and prevent it from meeting market demand.

[0003] To meet market demand, existing technologies offer artificial stone products with stone-like textures, such as quartz stone and engineered stone. However, these primarily use resin as a binder, resulting in poor weather resistance, easy aging, and insufficient fire resistance. While cement-based inorganic artificial stone offers advantages in weather resistance and fire resistance, it generally suffers from low density, high water absorption, monotonous textures, and poor stone-like effects. Especially in imitating granite textures, current technologies often employ direct mixing of color powders or surface coloring, resulting in stiff textures, poor layering, and difficulty in achieving the gradient and interlocking grain effects of natural granite.

[0004] Furthermore, in terms of reinforcing materials, existing inorganic stones often incorporate steel fibers or synthetic fibers to improve mechanical properties, but this easily leads to a "floating fiber" phenomenon, affecting surface quality and polishing effects. How to achieve realistic granite textures while ensuring high strength and density, and avoiding fiber exposure, is a pressing technical problem to be solved in this field. Summary of the Invention

[0005] Based on this, in order to solve one of the above-mentioned technical problems, the present invention provides an inorganic stone with a granite-like texture and a method for preparing the same, the specific technical solution of which is as follows:

[0006] An inorganic stone with a granite-like texture, the inorganic stone comprising the following raw materials in parts by weight: 40-60 parts fine aggregate, 15-40 parts cementitious material, 0.1-1 part modified reinforcing fiber, 1-2 parts modified styrene-butadiene emulsion, 1-3 parts dispersant, 0.1-0.2 parts water-reducing agent, 0.02-0.05 parts water-retaining agent, and 0.001-0.1 parts pigment;

[0007] The modified reinforcing fiber is prepared by adding reinforcing fibers of different grades into a reaction vessel, then using plasma to activate the vaporized modified liquid, so that the modified liquid is deposited on the surface of the reinforcing fiber in gas phase, then adding sulfonic acid-grafted chitosan, and after reaction treatment under certain conditions, the modified reinforcing fiber is obtained.

[0008] Furthermore, the reinforcing fiber is a mixture of polyvinyl alcohol fiber, silicon carbide fiber and basalt fiber, and the weight ratio of the polyvinyl alcohol fiber, silicon carbide fiber and basalt fiber is (1~2):(1~5):(3~7).

[0009] Furthermore, the polyvinyl alcohol fiber has a length of 10-12 mm; the silicon carbide fiber has a length of 5-8 mm; and the basalt fiber has a length of 2-5 mm.

[0010] Furthermore, the modified liquid comprises methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of (3~5):(1~7).

[0011] Furthermore, the grafting rate of the sulfonic acid-grafted chitosan is 0.1wt%~0.5wt%.

[0012] Further, the fine aggregate includes fine sand A with a particle size of 0.075~0.15mm, fine sand B with a particle size of 0.15~0.3mm, and fine sand C with a particle size of 0.3~0.6mm, and the weight ratio of fine sand A, fine sand B and fine sand C is (1~3):(4~6):(3~5).

[0013] Furthermore, the cementitious material includes cement and mineral powder, and the weight ratio of the cement to the mineral powder is (18~30):(5~10).

[0014] Further, the modified styrene-butadiene emulsion is prepared as follows: the styrene-butadiene emulsion is heated to 60~90℃, and dibutylhydroxytoluene and nano titanium dioxide are added at a rotation speed of 50r / min~300r / min. The mixture is stirred for 1h~2h to obtain the modified styrene-butadiene emulsion.

[0015] Further, by weight, the ratio of the styrene-butadiene emulsion, butylated hydroxytoluene, and nano-titanium dioxide is (10~15):(0.1~0.5):(0.1~0.3).

[0016] In addition, the present invention also provides a method for preparing an inorganic stone with a granite-like texture, the method comprising the following steps:

[0017] S1. Modified reinforcing fiber, modified styrene-butadiene emulsion, dispersant, water-reducing agent, and water-retaining agent are added to water and stirred evenly. Then, fine aggregate and cementitious material are added, and stirring is continued. The water-cement ratio is controlled at 0.17~0.20 to obtain wet material A. S2. Under stirring conditions, pigments are added to wet material A in batches. The color superposition generated during the stirring process produces a gradient texture to obtain wet material B.

[0018] S3. The wet material B is crushed using a crusher to make the average particle size of the wet material B less than 20mm, thus obtaining wet material C;

[0019] S4. The wet material C is spread out, and water is sprayed during the spreading process. After molding, it is vacuumed and pressed.

[0020] S5. After demolding, cure for 7-10 days. After curing, saw and polish to obtain inorganic stone with imitation granite texture.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention, by adding a plasma-activated vapor deposition modification liquid, introduces surface groups that can better crosslink with sulfonic acid-grafted chitosan. The resulting modified reinforced fibers not only have higher surface active sites and better compatibility, but also effectively enhance the interfacial bonding force between the modified reinforced fibers and the inorganic matrix. The chemical bonding and physical anchoring effect formed on the fiber surface effectively promotes stress transfer and avoids the "floating fiber" phenomenon that is prone to occur in traditional fiber-reinforced materials. In addition, by compounding polyvinyl alcohol fibers, silicon carbide fibers, and basalt fibers of different grades, a multi-level, multi-dimensional spatial network structure is constructed in the matrix. Polyvinyl alcohol fibers play a bridging and toughening role, while silicon carbide fibers and basalt fibers can effectively inhibit the initiation and propagation of microcracks. At a low dosage, their synergistic effect achieves a significant reinforcement purpose.

[0023] 2. This invention uses butylated hydroxytoluene and nano-titanium dioxide to modify styrene-butadiene emulsion, thereby improving the application stability of the modified styrene-butadiene emulsion and its compatibility with inorganic hydration products; and the organic-inorganic interpenetrating network structure formed after curing further enhances the toughness and impermeability of the inorganic stone.

[0024] 3. Through optimization of composition and process, this invention can produce an inorganic stone that is dense and smooth, with low water absorption, high gloss, and a high-grade stone texture. It also has the crystalline and substantial feel of natural granite, which can meet the needs of high-performance environmentally friendly imitation stone materials. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] An embodiment of the present invention provides an inorganic stone with a granite-like texture, wherein the inorganic stone comprises the following raw materials in parts by weight: 40-60 parts fine aggregate, 15-40 parts cementitious material, 0.1-1 part modified reinforcing fiber, 1-2 parts modified styrene-butadiene emulsion, 1-3 parts dispersant, 0.1-0.2 parts water-reducing agent, 0.02-0.05 parts water-retaining agent, and 0.001-0.1 parts pigment;

[0028] The modified reinforcing fiber is prepared by adding reinforcing fibers of different grades into a reaction vessel, then using plasma to activate the vaporized modified liquid, so that the modified liquid is deposited on the surface of the reinforcing fiber in gas phase, then adding sulfonic acid-grafted chitosan, and after reaction treatment under certain conditions, the modified reinforcing fiber is obtained.

[0029] In one embodiment, the reinforcing fiber is a mixture of polyvinyl alcohol fiber, silicon carbide fiber and basalt fiber, and the weight ratio of the polyvinyl alcohol fiber, silicon carbide fiber and basalt fiber is (1~2):(1~5):(3~7).

[0030] In one embodiment, the polyvinyl alcohol fiber has a length of 10-12 mm; the silicon carbide fiber has a length of 5-8 mm; and the basalt fiber has a length of 2-5 mm.

[0031] In one embodiment, the modified liquid comprises methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of (3~5):(1~7).

[0032] In one embodiment, the grafting rate of the sulfonic acid-grafted chitosan is 0.1wt% to 0.5wt%.

[0033] In one embodiment, the ratio of the reinforcing fiber, the modified liquid, and the sulfonic acid-grafted chitosan by weight is (8~12):(1~2):(1~3).

[0034] In one embodiment, the reaction treatment under certain conditions is as follows: heating to 60℃~75℃ and stirring at a speed of 50r / min~100r / min for 30min~60min.

[0035] In one embodiment, the fine aggregate includes fine sand A with a particle size of 0.075~0.15mm, fine sand B with a particle size of 0.15~0.3mm, and fine sand C with a particle size of 0.3~0.6mm, and the weight ratio of fine sand A, fine sand B and fine sand C is (1~3):(4~6):(3~5).

[0036] In one embodiment, the cementitious material includes cement and mineral powder, and the weight ratio of the cement to the mineral powder is (18~30):(5~10).

[0037] In one embodiment, the mineral powder is at least one of montmorillonite and kaolinite.

[0038] In one embodiment, the modified styrene-butadiene emulsion is prepared as follows: the styrene-butadiene emulsion is heated to 60~90℃, and dibutylhydroxytoluene and nano-titanium dioxide are added at a rotation speed of 50r / min~300r / min. The mixture is stirred for 1h~2h to obtain the modified styrene-butadiene emulsion.

[0039] In one embodiment, the ratio of the styrene-butadiene emulsion, butylated hydroxytoluene, and nano-titanium dioxide by weight is (10~15):(0.1~0.5):(0.1~0.3).

[0040] In one embodiment, the dispersant is polyethylene glycol.

[0041] In one embodiment, the water-reducing agent is a polycarboxylate water-reducing agent.

[0042] In one embodiment, the water-retaining agent is at least one of carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose.

[0043] In one embodiment, the pigment is at least one of titanium dioxide, iron oxide red, iron oxide black, iron oxide yellow, iron oxide blue, iron oxide green, and iron oxide brown.

[0044] In addition, the present invention also provides a method for preparing an inorganic stone with a granite-like texture, the method comprising the following steps:

[0045] S1. Modified reinforcing fiber, modified styrene-butadiene emulsion, dispersant, water-reducing agent, and water-retaining agent are added to water and stirred evenly. Then, fine aggregate and cementitious material are added, and stirring is continued. The water-cement ratio is controlled at 0.17~0.20 to obtain wet material A. S2. Under stirring conditions, pigments are added to wet material A in batches. The color superposition generated during the stirring process produces a gradient texture to obtain wet material B.

[0046] S3. The wet material B is crushed using a crusher to make the average particle size of the wet material B less than 20mm, thus obtaining wet material C;

[0047] S4. The wet material C is spread out, and water is sprayed during the spreading process. After molding, it is vacuumed and pressed.

[0048] S5. After demolding, cure for 7-10 days. After curing, saw and polish to obtain inorganic stone with imitation granite texture.

[0049] In one embodiment, in step S1, the stirring speed is 500 r / min to 1000 r / min, and the stirring time is 1 h to 3 h.

[0050] In one embodiment, in step S2, the stirring conditions are: a rotation speed of 20 r / min to 50 r / min.

[0051] In one embodiment, in step S2, the pigment is added in 2 to 5 portions, and each portion is gently mixed for 1 to 3 minutes after addition.

[0052] In one embodiment, in step S4, the spray water replenishment uses an atomizing nozzle.

[0053] In one embodiment, in step S4, the vacuum degree is 0.5~1 bar, the pressure is 1MPa~5MPa, the vibration frequency is 500Hz~600Hz, and the pressing time is 1min~3min.

[0054] The inorganic stone with a granite-like texture obtained by the above method has excellent mechanical properties, excellent density, low water absorption, and superior applicability and aesthetics.

[0055] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0056] Example 1:

[0057] A method for preparing an inorganic stone with a granite-like texture, the method comprising the following steps:

[0058] S1. By weight, add 0.5 parts of modified reinforcing fiber, 2 parts of modified styrene-butadiene emulsion, 2 parts of polyethylene glycol, 0.1 parts of polycarboxylate superplasticizer, and 0.03 parts of carboxymethyl cellulose to an appropriate amount of water, stir evenly, then add 55 parts of fine aggregate and 35 parts of cementitious material, and continue stirring at 800 r / min for 2 hours, controlling the water-cement ratio to 0.20 to obtain wet material A;

[0059] The modified reinforcing fiber is prepared as follows: 2 parts by weight of polyvinyl alcohol fiber with a length of 12 mm, 3 parts by weight of silicon carbide fiber with a length of 6 mm, and 5 parts by weight of basalt fiber with a length of 3 mm are added sequentially to a reaction vessel. Then, a modified liquid (methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 3:7) is activated by plasma to deposit 2 parts of the modified liquid onto the surface of the reinforcing fiber in the gas phase. Then, 3 parts of sulfonic acid-grafted chitosan with a grafting rate of 0.3 wt% are added, and the mixture is heated to 65°C and stirred at 100 r / min for 35 min to obtain the modified reinforcing fiber.

[0060] The fine aggregate includes fine sand A with a particle size of 0.15 mm, fine sand B with a particle size of 0.3 mm, and fine sand C with a particle size of 0.5 mm, and the weight ratio of fine sand A, fine sand B and fine sand C is 2:5:3.

[0061] The cementitious material includes cement and kaolin, and the weight ratio of cement to kaolin is 25:10.

[0062] The modified styrene-butadiene emulsion is prepared as follows: 10 parts by weight of styrene-butadiene emulsion are heated to 75°C, and 0.3 parts of butylated hydroxytoluene and 0.2 parts of nano-titanium dioxide are added at a speed of 100 r / min. The mixture is stirred for 1 hour to obtain the modified styrene-butadiene emulsion; S2. Under stirring at a speed of 20 r / min, 0.1 parts of pigment are added to the wet material A in 5 portions, and each addition is gently mixed for 1 minute. The color superposition during the stirring process produces a gradient texture to obtain wet material B;

[0063] S3. The wet material B is crushed using a crusher to make the average particle size of the wet material B less than 20mm, thus obtaining wet material C;

[0064] S4. The wet material C is spread out, and water is added by atomizing nozzle during the spreading process. After molding, it is pressed for 2 minutes under vacuum of 1 bar, pressure of 5 MPa, vibration frequency of 500 Hz.

[0065] S5. After demolding the material pressed in step S4, cure it for 10 days. After curing, saw and polish it to obtain inorganic stone with imitation granite texture.

[0066] Example 2:

[0067] A method for preparing an inorganic stone with a granite-like texture, the method comprising the following steps:

[0068] S1. By weight, add 0.6 parts of modified reinforcing fiber, 2 parts of modified styrene-butadiene emulsion, 3 parts of polyethylene glycol, 0.2 parts of polycarboxylate superplasticizer, and 0.04 parts of carboxymethyl cellulose to an appropriate amount of water, stir evenly, then add 55 parts of fine aggregate and 35 parts of cementitious material, and continue stirring at 800 r / min for 2 hours, controlling the water-cement ratio to 0.20 to obtain wet material A;

[0069] The modified reinforcing fiber is prepared as follows: 2 parts by weight of polyvinyl alcohol fiber with a length of 12 mm, 3 parts by weight of silicon carbide fiber with a length of 6 mm, and 5 parts by weight of basalt fiber with a length of 3 mm are added sequentially to a reaction vessel. Then, a modified liquid (methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 3:7) activated by plasma is used to deposit 2 parts of the modified liquid onto the surface of the reinforcing fiber in the gas phase. Then, 3 parts of sulfonic acid-grafted chitosan with a grafting rate of 0.3 wt% are added, and the mixture is heated to 70°C and stirred at a speed of 100 r / min for 35 min to obtain the modified reinforcing fiber.

[0070] The fine aggregate includes fine sand A with a particle size of 0.15 mm, fine sand B with a particle size of 0.3 mm, and fine sand C with a particle size of 0.5 mm, and the weight ratio of fine sand A, fine sand B and fine sand C is 2:5:3.

[0071] The cementitious material includes cement and kaolin, and the weight ratio of cement to kaolin is 25:10.

[0072] The modified styrene-butadiene emulsion is prepared as follows: 10 parts by weight of styrene-butadiene emulsion are heated to 80°C, and 0.4 parts of butylated hydroxytoluene and 0.1 parts of nano-titanium dioxide are added at a speed of 100 r / min. The mixture is stirred for 1 hour to obtain the modified styrene-butadiene emulsion; S2. Under the condition of stirring at a speed of 20 r / min, 0.1 parts of pigment are added to the wet material A in 5 portions, and each addition is gently mixed for 1 minute. The color superposition generated during the stirring process produces a gradient texture to obtain wet material B;

[0073] S3. The wet material B is crushed using a crusher to make the average particle size of the wet material B less than 20mm, thus obtaining wet material C;

[0074] S4. The wet material C is spread out, and water is added by atomizing nozzle during the spreading process. After molding, it is pressed for 2 minutes under vacuum of 1 bar, pressure of 5 MPa, vibration frequency of 500 Hz.

[0075] S5. After demolding the material pressed in step S4, cure it for 10 days. After curing, saw and polish it to obtain inorganic stone with imitation granite texture.

[0076] Example 3:

[0077] A method for preparing an inorganic stone with a granite-like texture, the method comprising the following steps:

[0078] S1. By weight, add 0.5 parts of modified reinforcing fiber, 2 parts of modified styrene-butadiene emulsion, 3 parts of polyethylene glycol, 0.2 parts of polycarboxylate superplasticizer, and 0.05 parts of carboxymethyl cellulose to an appropriate amount of water, stir evenly, then add 58 parts of fine aggregate and 35 parts of cementitious material, and continue stirring at 1000 r / min for 2 hours, controlling the water-cement ratio to 0.20 to obtain wet material A;

[0079] The modified reinforcing fiber is prepared as follows: 2 parts by weight of polyvinyl alcohol fiber with a length of 10 mm, 3 parts by weight of silicon carbide fiber with a length of 7 mm, and 5 parts by weight of basalt fiber with a length of 3 mm are added sequentially to a reaction vessel. Then, a modified liquid (methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 3:7) is activated by plasma to vaporize the modified liquid onto the surface of the reinforcing fiber. Then, 3 parts by weight of sulfonic acid-grafted chitosan with a grafting rate of 0.3 wt% are added, and the mixture is heated to 75°C and stirred at 100 r / min for 40 min to obtain the modified reinforcing fiber.

[0080] The fine aggregate includes fine sand A with a particle size of 0.15 mm, fine sand B with a particle size of 0.3 mm, and fine sand C with a particle size of 0.5 mm, and the weight ratio of fine sand A, fine sand B and fine sand C is 2:5:3.

[0081] The cementitious material includes cement and kaolin, and the weight ratio of cement to kaolin is 25:10.

[0082] The modified styrene-butadiene emulsion is prepared as follows: 10 parts by weight of styrene-butadiene emulsion are heated to 75°C, and 0.3 parts of butylated hydroxytoluene and 0.2 parts of nano-titanium dioxide are added at a speed of 100 r / min. The mixture is stirred for 1 hour to obtain the modified styrene-butadiene emulsion; S2. Under stirring at a speed of 20 r / min, 0.1 parts of pigment are added to the wet material A in 5 portions, and each addition is gently mixed for 1 minute. The color superposition during the stirring process produces a gradient texture to obtain wet material B;

[0083] S3. The wet material B is crushed using a crusher to make the average particle size of the wet material B less than 20mm, thus obtaining wet material C;

[0084] S4. The wet material C is spread out, and water is added by atomizing nozzle during the spreading process. After molding, it is pressed for 1 minute under vacuum of 1 bar, pressure of 4 MPa, vibration frequency of 500 Hz.

[0085] S5. After demolding the material pressed in step S4, cure it for 10 days. After curing, saw and polish it to obtain inorganic stone with imitation granite texture.

[0086] Comparative Example 1:

[0087] The difference between Comparative Example 1 and Example 3 is that Comparative Example 1 contains a single polyvinyl alcohol fiber with a length of 10 mm, i.e., no silicon carbide fiber or basalt fiber is added. Otherwise, it is the same as Example 3.

[0088] Comparative Example 2:

[0089] The difference between Comparative Example 2 and Example 3 is that Comparative Example 2 added a single silicon carbide fiber with a length of 7 mm, that is, it did not add polyvinyl alcohol fiber and basalt fiber, otherwise it was the same as Example 3.

[0090] Comparative Example 3:

[0091] The difference between Comparative Example 3 and Example 3 is that Comparative Example 3 added a single basalt fiber with a length of 3 mm, that is, it did not add polyvinyl alcohol fiber and silicon carbide fiber, otherwise it was the same as Example 3.

[0092] Comparative Example 4:

[0093] The difference between Comparative Example 4 and Example 3 is that the preparation method of the modified reinforcing fiber in Comparative Example 4 is different, while the rest is the same as in Example 3.

[0094] The modified reinforcing fiber in Comparative Example 4 was prepared as follows: 2 parts by weight of polyvinyl alcohol fiber with a length of 10 mm, 3 parts by weight of silicon carbide fiber with a length of 7 mm, and 5 parts by weight of basalt fiber with a length of 3 mm were added to the reactor in sequence. Then, 2 parts by weight of modification liquid (methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 3:7) were added, and the mixture was heated to 75°C and stirred at 100 r / min for 40 min to obtain the modified reinforcing fiber.

[0095] Comparative Example 5:

[0096] The difference between Comparative Example 5 and Example 3 is that the preparation method of the modified reinforcing fiber in Comparative Example 5 is different, while the rest is the same as in Example 3.

[0097] The modified reinforcing fiber in Comparative Example 5 was prepared as follows: 2 parts by weight of polyvinyl alcohol fiber with a length of 10 mm, 3 parts by weight of silicon carbide fiber with a length of 7 mm, and 5 parts by weight of basalt fiber with a length of 3 mm were added to a reaction vessel in sequence. Then, 2 parts by weight of γ-aminopropyltriethoxysilane and 3 parts by weight of sulfonic acid-grafted chitosan with a grafting rate of 0.3 wt% were added. The mixture was heated to 75 °C and stirred at a speed of 100 r / min for 35 min to obtain the modified reinforcing fiber.

[0098] Comparative Example 6:

[0099] The difference between Comparative Example 6 and Example 3 is that the reinforcing fibers (2 parts of polyvinyl alcohol fibers with a length of 10 mm, 3 parts of silicon carbide fibers with a length of 7 mm and 5 parts of basalt fibers with a length of 3 mm) in Comparative Example 6 were not modified, but otherwise the same as in Example 3.

[0100] Comparative Example 7:

[0101] The difference between Comparative Example 7 and Example 3 is that no modified reinforcing fibers were added in Comparative Example 7, but otherwise the same as in Example 3.

[0102] Comparative Example 8:

[0103] The difference between Comparative Example 8 and Example 3 is that the styrene-butadiene emulsion in Comparative Example 8 was not modified, but otherwise it was the same as Example 3.

[0104] The inorganic stone samples with imitation granite texture prepared in Examples 1-3 and the inorganic stone samples with imitation granite texture prepared in Comparative Examples 1-8 were subjected to performance tests, and the results are shown in Table 1 below.

[0105] Among them, the flexural strength and compressive strength were tested according to JC / T2604-2021; the water absorption rate was tested according to GB / T4111-2013; and the gloss was tested according to GB / T13891-2008.

[0106] Table 1: Performance Test Results

[0107]

[0108] Analysis of the data in Table 1 shows that the addition of modified reinforcing fibers, modified styrene-butadiene emulsion, and optimization of the fine aggregate gradation in this invention significantly improves the overall mechanical properties of inorganic stone. The prepared inorganic stone exhibits excellent density and polishing effect, without any fiber floating issues. Compared to Example 3, Comparative Examples 1-3 used a single fiber, resulting in inferior mechanical properties of the inorganic stone in Comparative Examples 1-3 compared to Example 3. This indicates that the addition of three different fiber gradations in this invention provides bridging and toughening, while silicon carbide and basalt fibers inhibit microcrack propagation. Their synergistic effect constructs a spatial network structure, enhancing overall performance. The reinforcing fiber modification method in Comparative Example 4 is different; it did not undergo plasma-activated vapor deposition and did not introduce sulfonic acid-grafted chitosan, leading to insufficient fiber surface modification and decreased interfacial bonding. The modified reinforcing fiber in Comparative Example 5 was prepared using a different method, resulting in a less effective modification than in Example 3. This led to poor interfacial bonding and overall performance inferior to Example 3. The reinforcing fiber in Comparative Example 6 was not modified, resulting in poor interfacial bonding and slight agglomeration, leading to fiber floating and poor performance. Comparative Example 7 did not add any modified reinforcing fiber, resulting in poor density and mechanical properties. In Comparative Example 8, the styrene-butadiene emulsion was not modified, lacking the filling effect of nano-titanium dioxide and the antioxidant effect of butylated hydroxytoluene, resulting in slightly worse mechanical properties and impermeability than in Example 3.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An inorganic stone imitating a granite texture, characterized in that, The inorganic stone comprises the following raw materials by weight: fine aggregate 40-60 parts, cementing material 15-40 parts, modified reinforcing fiber 0.1-1 part, modified butyl styrene emulsion 1-2 parts, dispersant 1-3 parts, water reducing agent 0.1-0.2 parts, water retaining agent 0.02-0.05 parts, and pigment 0.001-0.1 parts; The preparation method of the modified reinforcing fiber comprises the following steps: adding reinforcing fibers with different gradations into a reaction kettle, then using a plasma activated gasification modification liquid to make the modification liquid gas deposit on the surface of the reinforcing fibers, then adding sulfonic acid group grafted chitosan, and obtaining the modified reinforcing fiber after reaction treatment under certain conditions; and the modification liquid comprises methyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of (3-5):(1-7). The reinforcing fiber is a mixture of polyvinyl alcohol fiber, silicon carbide fiber and basalt fiber, and the weight ratio of the polyvinyl alcohol fiber, the silicon carbide fiber and the basalt fiber is (1-2):(1-5):(3-7). The length of the polyvinyl alcohol fiber is 10-12 mm; the length of the silicon carbide fiber is 5-8 mm; and the length of the basalt fiber is 2-5 mm. The preparation method of the modified butyl styrene emulsion comprises the following steps: heating butyl styrene emulsion to 60-90°C, adding dibutyl hydroxytoluene and nano titanium dioxide at a rotating speed of 50-300 r / min, and continuing to stir for 1-2 h to obtain the modified butyl styrene emulsion; and the ratio of the butyl styrene emulsion, the dibutyl hydroxytoluene and the nano titanium dioxide is (10-15):(0.1-0.5):(0.1-0.3) by weight.

2. The inorganic stone according to claim 1, characterized in that, The grafting rate of the sulfonic acid group grafted chitosan is 0.1wt%-0.5wt%.

3. The inorganic stone according to claim 1, characterized in that, The fine aggregate comprises fine sand A with a particle size of 0.075-0.15 mm, fine sand B with a particle size of 0.15-0.3 mm, and fine sand C with a particle size of 0.3-0.6 mm, and the weight ratio of the fine sand A, the fine sand B and the fine sand C is (1-3):(4-6):(3-5).

4. The inorganic stone according to claim 1, characterized in that, The cementing material comprises cement and mineral powder, and the weight ratio of the cement and the mineral powder is (18-30):(5-10).

5. A method for producing an inorganic stone imitating a granite texture, characterized in that, The preparation method is used for preparing the inorganic stone with granite texture as claimed in any one of claims 1-4, and comprises the following steps: S1. adding modified reinforcing fiber, modified butyl styrene emulsion, dispersant, water reducing agent and water retaining agent into water, stirring uniformly, then adding fine aggregate and cementing material, and continuing to stir, so as to control the water-cement ratio to be 0.17-0.20, and obtaining wet material A; S2. adding pigment into the wet material A in batches under stirring, and generating a gradient texture by color superposition generated in the stirring process, and obtaining wet material B; S3. crushing the wet material B by using a crusher so that the average particle size of the wet material B is less than 20 mm, and obtaining wet material C; S4. distributing the wet material C, and spraying water during the distribution process, and performing vacuumizing and pressing after molding. S5. After demoulding, the product is cured for 7~10 days, and then sawn and polished to obtain inorganic stone with imitation granite texture.

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