High-performance composite aggregate real stone paint and preparation method thereof

Abstract

The invention relates to the technical field of building coatings, in particular to a high-performance composite aggregate real stone paint and a preparation method thereof. The stone-like coating is prepared from the following materials in percentage by mass: 71.5 to 76 percent of composite aggregate, 22.7 to 27.7 percent of functional emulsion, 0.7 to 0.8 percent of additive and 0 to 0.5 percent of inorganic pigment, the stone-like coating adopts a composite aggregate system, gives consideration to the strength, light weight and recycling of materials, breaks through the performance bottleneck of single aggregate, can improve the surface strength and scratch resistance of the stone-like coating after construction, and reduces the weight of a product; meanwhile, organic-inorganic compound functional emulsion is adopted, and under the action of special organic emulsion and inorganic additives, the pollution resistance, water whitening resistance and mildew resistance of the real stone paint are improved. The problems of single aggregate performance, weak emulsion function and influence on product homogeneity due to extensive preparation process of the existing real stone paint are solved.

Description

Technical Field

[0001] This invention belongs to the field of architectural coatings technology, and particularly relates to a high-performance composite aggregate stone paint and its preparation method. Background Technology

[0002] Due to its natural stone texture and convenient construction, real stone paint has become a mainstream material for building exterior wall decoration, experiencing rapid growth and expansion in the construction market. Traditional real stone paint typically uses natural or manufactured sand (mainly limestone and marble) as aggregate and organic emulsions (such as acrylic esters and styrene-acrylic emulsions) as the binder, prepared through conventional mechanical mixing processes. However, this type of real stone paint has the following drawbacks in use: (1) Problems caused by single aggregate: Natural sand resources are scarce and have a single gradation. Although limestone aggregate is low in cost, it is not hard enough and has poor weather resistance, which can easily lead to coating powdering and reduced stain resistance. At the same time, the bonding force between aggregate and emulsion interface is weak, which can easily cause hollowing and peeling.

[0003] (2) Limitations of emulsion function: Traditional organic emulsions have poor water resistance, are prone to cracking at low temperatures, and lack additional functions such as anti-fouling and antibacterial properties, making it difficult to meet the needs of complex environments such as high cold and high humidity; in addition, the direct addition of antifungal agents is prone to migration and failure, and the long-term effect is insufficient.

[0004] (3) The crude preparation process affects the homogeneity of the product: Conventional preparation processes involve simple mixing of materials, which can easily lead to uneven dispersion of aggregates, insufficient emulsion coating, poor coating density, and the agglomeration of nanomaterials, which makes it difficult to play a reinforcing role, ultimately resulting in insufficient product stability.

[0005] Therefore, there is an urgent need to design a real stone paint that uses high-performance composite materials as aggregates to solve the problems existing in the above-mentioned technologies. Summary of the Invention

[0006] To address the problems of existing stone-like paints, such as limited aggregate properties, weak emulsion functionality, and crude preparation processes affecting product homogeneity, this invention proposes a high-performance composite aggregate stone-like paint and its preparation method. In terms of aggregates, this stone-like paint uses limestone sand as a base, combined with porous ceramsite sand, hollow microspheres, and modified multi-metal powder, balancing product strength, lightweight, texture, and chemical stability. Regarding the emulsion, an organic-inorganic functional emulsion is formulated, introducing inorganic material nano-intercalation and slow-release anti-mildew technology into the organic emulsion, improving the product's water-whitening resistance and mildew resistance. In terms of the preparation process, a gradient stirring enhanced dispersion process is employed to achieve uniform dispersion of nanomaterials and efficient bonding between the aggregate and emulsion, improving coating density and product uniformity and stability.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-performance composite aggregate stone-like paint, wherein the mass ratio of materials in the stone-like paint is: composite aggregate 71.5~76%, functional emulsion 22.7~27.7%, additives 0.7~0.8%, and inorganic pigments 0~0.5%; The composite aggregate is based on limestone sand and also includes calcined ceramsite sand, hollow microspheres and modified multi-metal powder. The functional emulsion is an organic-inorganic functional emulsion, which uses organosilicon-modified acrylate emulsion as the base emulsion and also includes nano-montmorillonite, inorganic slow-release antifungal agent and deionized water.

[0008] In a preferred embodiment of the present invention, in the composite aggregate, limestone sand accounts for 70.6-71.3% of the main aggregate by mass; calcined ceramsite sand is porous ceramsite sand with a density of 0.6-0.8 kg / m³, accounting for 19.6-21.1% of the main aggregate by mass; the hollow microspheres are fly ash hollow microspheres with a density of 0.4-0.7 kg / m³ and a particle size of 50-150 μm, accounting for 6.6-7.7% of the main aggregate by mass; and modified polymetallic powder accounts for 1.3-1.4% of the main aggregate by mass. In the limestone sand, the proportion of 30-40 mesh particles is 23.5-26.4% by mass, the proportion of 40-80 mesh particles is 54.9-59.3% by mass, and the proportion of 80-120 mesh particles is 16.7-21.6% by mass.

[0009] In a preferred embodiment of the present invention, the modified polymetallic powder is a polymetallic powder obtained by carbothermic reduction-water quenching-grinding modification of aluminum-magnesium alloy and titanium alloy waste. Its main components include aluminum, titanium and magnesium elements, with aluminum accounting for 55-65%, titanium accounting for 25-35%, and magnesium accounting for 6-10%. The powder particle size is less than 74μm.

[0010] In a preferred embodiment of the present invention, in the functional emulsion, the silicone-modified acrylate emulsion accounts for 14.5-16.7% of the mass percentage of the stone paint; nano-montmorillonite accounts for 1.1-1.8% of the mass percentage of the stone paint; inorganic slow-release antifungal agent accounts for 0.1-0.2% of the mass percentage of the stone paint; and deionized water accounts for 7-9% of the mass percentage of the stone paint.

[0011] In a preferred embodiment of the present invention, the inorganic slow-release antifungal agent is composed of at least two of nano-titanium dioxide, nano-alumina, nano-zinc oxide and silver-loaded zeolite.

[0012] In a preferred embodiment of the present invention, the additives include film-forming aids, antifreeze, defoamers, and preservatives, and their mass percentages in the real stone paint are 0.3~0.4%, 0.2~0.3%, 0.1%, and 0.1%, respectively.

[0013] In a preferred embodiment of the present invention, the film-forming aid is Eastman dodecyl alcohol ester; the antifreeze is a water-soluble alcohol antifreeze; the defoamer is a mineral oil defoamer; and the preservative is KY-LXE multi-system preservative and bactericide.

[0014] In a preferred embodiment of the present invention, the water-soluble alcohol antifreeze is one of ethylene glycol and propylene glycol.

[0015] This invention provides a second solution: a method for preparing a high-performance composite aggregate stone-like paint, comprising the following steps: (1) Weigh the materials, add the weighed deionized water to a special stirrer, add nano montmorillonite, stir at 400-500 rpm for 5-7 minutes to obtain nano montmorillonite suspension. (2) Place the silicone-modified acrylate emulsion in a special stirrer and stir slowly at 350-400 rpm. While stirring, add the nano-montmorillonite suspension and inorganic slow-release antifungal agent obtained in step (1). Then stir at 900-1000 rpm for 10-15 min to form an organic-inorganic compound functional emulsion. (3) Add additives sequentially to the organic-inorganic composite emulsion obtained in step (2), and stir at 900~1000 rpm for 10~12 min to obtain the first mixture; (4) Add 55-70% of the composite aggregate to the first mixture obtained in step (3), stir at 900-1000 rpm for 10-12 min, let stand for 4-5 min, then add the remaining composite aggregate and inorganic pigment, stir at 1100 rpm for 10-12 min, let stand for 5-6 min, and then stir at 1200-1250 rpm for 15-16 min to obtain real stone paint.

[0016] In a preferred embodiment of the present invention, the additives are added in the following order: defoamer, film-forming aid, antifreeze, and preservative.

[0017] In a preferred embodiment of the present invention, the special mixer includes a frame, and a graded mixing mechanism, a first mixing tank, and a second mixing tank mounted on the frame; the graded mixing mechanism includes a mixing motor, a first mixing component, and a second mixing component; the first mixing component is disposed below the mixing motor, connected to the mixing motor, and extends into the first mixing tank; the second mixing component is disposed at the lower end of the first mixing component and located inside the second mixing tank; the second mixing tank is located directly below the first mixing tank; The first mixing assembly includes a drive rod and a rod sleeve. The drive rod is mounted on the drive end of the stirring motor via a key shaft. The rod sleeve is movably fitted on the outside of the drive rod, and a plurality of mixing units are also provided on the drive rod. The mixing unit includes a first positioning sleeve and a mixing slurry. The first positioning sleeve is detachably installed on the outside of the rod sleeve. The mixing slurry has symmetrically arranged rectangular blades and is connected to the flange of the first positioning sleeve.

[0018] In a preferred embodiment of the present invention, the second mixing assembly includes a transmission rod and a plurality of second positioning sleeves. The transmission rod is detachably disposed inside the second mixing tank. A keyway is provided at the upper end of the transmission rod to cooperate with a key located at the lower end of the drive rod. A scraper is also provided at the lower end of the drive rod, and the scraper cooperates with the inner wall of the second mixing tank. The second positioning sleeves are detachably installed on the outside of the transmission rod, and a stirring unit is also installed on the second positioning sleeves. The stirring unit includes a flange and an adaptive stirring paddle. The flange is connected to the second positioning sleeve through a hinge support on the outside of the second positioning sleeve. The adaptive stirring paddle is an asymmetric wedge-shaped paddle located on the outside of the flange and is flange-connected to the flange. The present invention has at least the following beneficial effects: 1. The aggregate of the real stone paint provided by this invention is based on limestone sand, and is composed of porous ceramsite sand, hollow microspheres and modified multi-metal powder. It adopts a composite aggregate system, which takes into account the strength, lightweight and resource utilization of materials, and breaks through the performance bottleneck of single aggregate. It can improve the surface strength and scratch resistance of real stone paint after construction and reduce the weight of the product. Moreover, it uses sand produced as a by-product in limestone processing as the main aggregate, which can reduce the dependence of real stone paint production on natural sand and help reduce the raw material cost of real stone paint.

[0019] 2. The stone paint provided by this invention uses an organic-inorganic compound functional emulsion. Under the action of special organic emulsion and inorganic additives, the stain resistance, water whitening resistance and mildew resistance of the stone paint are improved, which can solve the problem of poor environmental adaptability of traditional emulsions.

[0020] 3. The method for preparing real stone paint provided by the present invention adopts a stepped enhanced stirring method in the process of mixing emulsion with other additives, the first mixture and composite aggregate, which promotes the efficient combination of aggregate and emulsion and the uniform dispersion of materials, and can effectively ensure the stability and uniformity of real stone paint.

[0021] 4. The agitator provided by the present invention can generate lifting force and radial thrust simultaneously during mixing, effectively suspending heavy aggregates and pressing in light components, avoiding situations such as heavy aggregates settling and light components floating.

[0022] This solves the problems of existing stone paints, such as the single aggregate properties, weak emulsion function, and the impact of crude preparation process on product homogeneity. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a diagram showing the morphology of the stone paint after stirring according to the present invention; Figure 2 This is a diagram showing the shape of the plaster after it has solidified according to the present invention. Figure 3 This is a side view of the stirrer of the present invention; Figure 4 This is a schematic diagram of the position adjustment mechanism of the present invention; Figure 5 This is a rear view of the frame of the present invention; Figure 6 This is a schematic diagram of the structure of the first mixing component of the present invention; Figure 7 This is a schematic diagram of the structure of the first mixed slurry of the present invention; Figure 8 This is a schematic diagram of the structure of the second mixing component of the present invention; Figure 9 This is a schematic diagram of the adaptive stirring impeller of the present invention; Figure 10 This is a schematic diagram of the scraper structure of the present invention; Figure 11 This is a schematic diagram of the positioning mechanism of the present invention.

[0024] The components include: 1. Frame; 2. Position adjustment mechanism; 3. Staged mixing mechanism; 31. Mixing motor; 32. First mixing assembly; 321. Drive rod; 322. Rod sleeve; 323. Pin; 324. First positioning sleeve; 325; 326. First mixing slurry; 33. Second mixing assembly; 331. Transmission rod; 332. Second positioning sleeve; 333. Flange; 334. Adaptive mixing paddle; 335. Scraper; 336. Keyway; 34. Mounting plate; 4. First mixing tank; 41. Drain pipe; 5. Second mixing tank; 6. Positioning mechanism. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1 The formulation of a high-performance composite aggregate stone paint based on limestone sand, composite porous ceramsite sand, hollow microspheres and modified multi-metal powder as aggregates; and organic-inorganic functional emulsion, in which inorganic materials are introduced into the organic emulsion through nano-intercalation and slow-release anti-mildew technology are used. The formulation is shown in Table 1.

[0027] Table 1: Formulation of High-Performance Composite Aggregate Stone Paint

[0028] Among them, in the high-performance composite aggregate stone paint formulations as shown in Table 1: (1) The self-made modified multi-metal powder is a multi-metal powder obtained by carbothermic reduction-water quenching-grinding of aluminum-magnesium alloy and titanium alloy waste. The carbothermic reduction temperature is 1200℃ and the time is 1h. The particle size of the powder after grinding is less than 74μm. The main components of the powder include aluminum, titanium and magnesium elements, with aluminum accounting for 59.5%, titanium accounting for 32.7% and magnesium accounting for 7.8%.

[0029] (2) The hollow microspheres are fly ash hollow microspheres with a density of 0.57 kg / m3 and a particle size of less than 74 μm.

[0030] (3) The functional emulsion is an organic-inorganic compound emulsion, and the base emulsion is an organosilicon modified acrylate emulsion; the nano-montmorillonite is the intercalation structure of the organic-inorganic compound emulsion, which is used to improve the water whitening resistance of the emulsion; the self-made inorganic slow-release antifungal agent is used to achieve long-term antifungal effect of the organic-inorganic compound emulsion.

[0031] The self-made inorganic slow-release antifungal agent is prepared by mixing nano-titanium dioxide and nano-silver-loaded waste rock in a ratio of 9:1.

[0032] (4) The film-forming aid is Eastman dodecyl alcohol ester; the antifreeze is a water-soluble alcohol antifreeze, preferably ethylene glycol; the defoamer is a mineral oil defoamer, preferably Nopco NXZ; the preservative is KY-LXE multi-system preservative and bactericide.

[0033] (5) The inorganic pigment is iron oxide powder of different colors with a particle size of less than 74 μm.

[0034] Example 2 Example 1: Unlike Example 1 above, the preparation of the high-performance composite aggregate stone paint with the formulation described in Example 1 of Table 1 in Example 1 includes the following steps: (1) Add the deionized water weighed according to Example 1 in Table 1 to a special stirrer, add nano-montmorillonite at a speed of 500 rpm, stir for 6 min to form a nano-montmorillonite suspension. (2) Place the silicone-modified acrylate emulsion in a special stirrer, and add the nano-montmorillonite suspension and inorganic slow-release antifungal agent obtained in step (1) while stirring at 400 rpm. Then stir at 900 rpm for 15 min to form an organic-inorganic compound functional emulsion. (3) Add additives (defoamer, film-forming aid, antifreeze and preservative in sequence) to the organic-inorganic composite emulsion obtained in step (2), and stir at 900 rpm for 10 min to obtain the first mixture; (4) Continue stirring at 900 rpm while adding 60% of the composite aggregate (limestone sand, calcined ceramsite sand, hollow microspheres and modified multi-metal powder) to the first mixture obtained in step (3), stir for 10 min, let stand for 3 min; then add the remaining 40% of the composite aggregate and inorganic pigment (iron oxide red), stir at 1100 rpm for 10 min, let stand for 5 min, and then stir at 1250 rpm for 15 min to obtain real stone paint.

[0035] Example 2: The preparation of the high-performance composite aggregate stone paint with the formulation described in Example 2 of Table 1 in Example 1 includes the following steps: (1) Add the deionized water weighed according to Example 2 in Table 1 to a special stirrer, add nano-montmorillonite at a speed of 400 rpm, stir for 7 min to form a nano-montmorillonite suspension. (2) Place the silicone-modified acrylate emulsion in a special stirrer, and add the nano-montmorillonite suspension and inorganic slow-release antifungal agent obtained in step (1) while stirring at 400 rpm. Then stir at 1000 rpm for 10 min to form an organic-inorganic compound functional emulsion. (3) Add additives (defoamer, film-forming aid, antifreeze and preservative in sequence) to the organic-inorganic composite emulsion obtained in step (2) above, and continue to stir at 1000 rpm for 10 min to obtain the first mixture; (4) Continue stirring at 1000 rpm while adding 70% of the composite aggregate (limestone sand, calcined ceramsite sand, hollow microspheres and modified multi-metal powder) to the first mixture obtained in step (3), stir for 12 min, let stand for 4 min; then add the remaining 30% of the composite aggregate and inorganic pigment (iron oxide red), stir at 1100 rpm for 10 min, let stand for 5 min, and then stir at 1200 rpm for 16 min to obtain real stone paint.

[0036] Example 3: The preparation of the high-performance composite aggregate stone paint with the formulation described in Example 3 of Table 1 in Example 1 includes the following steps: (1) Add the deionized water weighed according to Example 3 in Table 1 to a special stirrer, add nano-montmorillonite at a speed of 500 rpm, stir for 5 min to form a nano-montmorillonite suspension. (2) Place the silicone-modified acrylate emulsion in a special stirrer, and add the nano-montmorillonite suspension and inorganic slow-release antifungal agent obtained in step (1) while stirring at 350 rpm. Then stir at 900 rpm for 12 min to form an organic-inorganic compound functional emulsion. (3) Add additives (defoamer, film-forming aid, antifreeze and preservative) sequentially to the organic-inorganic composite emulsion obtained in step (2) above, and stir at 950 rpm for 12 min to obtain the first mixture; (4) Add 55% of the composite aggregate to the first mixture obtained in step (3) while stirring at 1000 rpm, stir for 10 min, let stand for 4 min, then add the remaining 45% of the composite aggregate and inorganic pigment (iron oxide red), stir at 1100 rpm for 12 min, let stand for 6 min; then stir at 1250 rpm for 15 min to obtain real stone paint.

[0037] Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that no calcined ceramsite sand is added to the aggregate, 40-80 mesh limestone sand is used to replace an equal amount of 60-100 mesh calcined ceramsite sand, and 80-120 mesh limestone sand is used to replace an equal amount of 100-150 mesh calcined ceramsite sand, while other conditions remain unchanged.

[0038] Comparative Example 2: The difference between Comparative Example 2 and Example 1 is that fly ash microspheres are not added to the aggregate, and 80-120 mesh limestone sand is used to replace an equal amount of fly ash hollow microspheres, while other conditions remain unchanged.

[0039] Comparative Example 3: The difference between Comparative Example 3 and Example 1 is that no modified multi-metal powder is added to the aggregate, and an equal amount of modified multi-metal powder is replaced with 80-120 mesh limestone sand, while other conditions remain unchanged.

[0040] Comparative Example 4: The difference between Comparative Example 4 and Example 1 is that no nano-montmorillonite was added to the emulsion, and an equal amount of organosilicon-modified acrylate emulsion was used instead of nano-montmorillonite, while other conditions remained unchanged.

[0041] Performance testing: The stone-like paints prepared in Examples 1-3 of Example 1 and Comparative Examples 1-4 of Example 2 were tested according to the methods specified in JG / T 24-2018 "Synthetic Resin Emulsion Sand-textured Architectural Coatings". The tests included drying time, initial drying crack resistance, container condition, workability, water resistance, low-temperature stability, stain resistance, alkali resistance, and bond strength. The scratch resistance of the stone-like paint was determined using the cross-cut test, and the wet density and color of the stone-like paint were also measured. The test results are shown in Table 2.

[0042] Table 2: Performance test results of the stone-like paints prepared in Examples 1-3 and Comparative Examples 1-4

[0043] As shown in Table 2, the stone-like paint prepared in Examples 1-3 of Example 1 is homogeneous and stable, has good workability, and high bonding strength; its stain resistance and scratch resistance are both grade 0, indicating good stain resistance and scratch resistance; its initial drying crack resistance, drying time, water resistance, alkali resistance, and low temperature stability are all better than the requirements of JG / T 24-2018 standard, and its overall performance is relatively good.

[0044] As can be seen from Comparative Examples 1 and 2, when calcined ceramsite sand or fly ash hollow microspheres are not added to the aggregate, the bonding strength, stain resistance and scratch resistance of the prepared stone paint are reduced compared with Example 1 due to the lack of lightweight and high-strength fine aggregate filling and stabilizing effect, and the wet density of the stone paint is higher than that of Example 1.

[0045] As shown in Comparative Example 3, the color of the aggregate is dull when no modified multi-metal powder is added. Modified multi-metal powder can enhance the surface color of the stone paint and give it a metallic luster. At the same time, the anti-oxidation and anti-deterioration properties of metal materials can improve the chemical stability of the stone paint.

[0046] As shown in Comparative Example 4, when no nano-montmorillonite is added to the emulsion, the stain resistance of the prepared stone paint is one level lower than that of Example 1.

[0047] In summary, the stone-like paint provided by this invention uses composite aggregates and functional emulsions, which improves the surface strength, gloss, stain resistance, scratch resistance, water resistance, and chemical stability of the stone-like paint, while also reducing the product weight and making it convenient to apply and use.

[0048] The method for preparing real stone paint provided by this invention can promote the uniform dispersion of materials by adopting a stepped enhanced stirring method, ensuring the stability and uniformity of the real stone paint, and thus obtaining a product with stable performance. This invention provides a new solution for the development of high-performance real stone paint through synergistic innovation of materials and processes.

[0049] Example 3: like Figures 3-11 As shown, unlike the above embodiments, the above-mentioned agitator is used to overcome the drastic viscosity change from low viscosity nano-montmorillonite suspension to high viscosity composite aggregate slurry during the production process of the real stone paint described in Embodiments 1 and 2, as well as the uniform dispersion of aggregates of different densities (such as lightweight hollow microspheres and heavy limestone sand). Traditional single impeller agitators have difficulty in taking into account the mixing efficiency of different viscosity stages and are prone to causing heavy aggregates to settle and lightweight aggregates to float.

[0050] This embodiment provides a mixer specifically designed for the production of the aforementioned stone paint, comprising a frame 1, a position adjustment mechanism 2 and a graded mixing mechanism 3, a first mixing tank 4 and a second mixing tank 5, all mounted on the frame 1. The position adjustment mechanism 2 is mounted on the frame 1 along the height direction of the support column and is used to adjust the height of the graded mixing mechanism 3. The graded mixing mechanism 3 is mounted on the position adjustment mechanism 2 and moves with the position adjustment mechanism 2. It includes a mixing motor 31, a first mixing component 32, and a second mixing component 33. The first mixing component 32 is located below the mixing motor 31, connected to the mixing motor 31, and extends into the first mixing tank 4. It is used to mix the deionized water and nano-montmorillonite added to the first mixing tank 4 during the first mixing stage. The second mixing component 33 is located at the lower end of the first mixing component 32, works in conjunction with the first mixing component 32, and is located inside the second mixing tank 5. During the second mixing stage, the second mixing component 33 is used to fully mix the nano-montmorillonite suspension, organosilicon-modified acrylate emulsion, additives, composite aggregates, and inorganic pigments added to the second mixing tank 5 to obtain a stone-like paint that meets the mixing requirements. The first mixing tank 4 is fixedly mounted on the support column by a positioning mechanism 6, and its position in the height direction of the support column can be adjusted according to usage requirements to match the first mixing component 32. The second mixing tank 5 is located directly below the first mixing tank 4 and is used in conjunction with the second mixing component 33 to fully mix the nano-montmorillonite suspension, organosilicon-modified acrylic emulsion, additives, composite aggregates and inorganic pigments added to the second mixing tank 5 to obtain a stone-like paint that meets the mixing requirements.

[0051] In one specific implementation, such as Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the stirring motor 31 is fixedly mounted on the mounting plate 34. The first mixing assembly 32 includes a drive rod 321 and a sleeve 322. The drive rod 321 is fixedly mounted on the drive end of the stirring motor 31 via a key shaft. The sleeve 322 is movably sleeved on the outside of the drive rod 321 and rotatably connected to the drive rod 321. During use, it is connected to the drive rod 321 via a pin 323, so that when the stirring motor 31 rotates, it can synchronously drive the sleeve 322 to rotate via the drive rod 321. When the pin 323 is removed, the sleeve 322 does not rotate with the drive rod 321. Several mixing units are also installed on the drive rod 321 to facilitate the mixing of materials in the first mixing tank 4 during use.

[0052] Specifically, the mixing unit includes a first positioning sleeve 324 and a mixing slurry 326. The first positioning sleeve 324 is detachably installed on the outside of the rod sleeve 322. The mixing slurry 326 is symmetrically arranged and flangedly connected to the first positioning sleeve 324, so that the installation angle of the first mixing slurry 326 can be adjusted according to the mixing requirements during use. The first mixing slurry 326 has rectangular blades, so that the nano-montmorillonite can be evenly stressed during the mixing process, ensuring the consistency of mixing.

[0053] Specifically, a drain pipe 41 is installed at the lower end of the first mixing tank 4. A control valve is installed on the drain pipe 41 to discharge the nano-montmorillonite suspension from the first mixing tank 4 after the nano-montmorillonite has been uniformly stirred and formed. Furthermore, a rubber sealing ring is installed in the lower opening of the first mixing tank 4 to cooperate with the drive rod 321, preventing leakage during the stirring process.

[0054] In one specific implementation, such as Figure 3 , Figure 8 , Figure 9 and Figure 10 As shown, the second mixing assembly 33 includes a transmission rod 331 and several second positioning sleeves 332. The transmission rod 331 is detachably engaged in the second mixing tank 5. A keyway 336 is provided at the upper end of the transmission rod 331, which cooperates with a locking key 325 provided at the lower end of the drive rod 321. When the position adjustment mechanism 2 adjusts the drive rod 321 to move downward, the locking key 325 engages with the keyway 336, realizing the power connection between the drive rod 321 and the transmission rod 331. That is, the drive rod 331 is driven to rotate under the rotation of the drive rod 321. A scraper 335 is also provided at the lower end of the drive rod 321, which cooperates with the inner wall of the second mixing tank 5. When the scraper 335 rotates with the transmission rod 331, it scrapes off the material adhering to the inner wall of the second mixing tank 5 and performs follow-up stirring to ensure the uniformity of the material in the second mixing tank 5 during stirring. The second positioning sleeve 332 is detachably installed on the outside of the transmission rod 331, and a stirring unit is also installed on the second positioning sleeve 332.

[0055] Specifically, the stirring unit includes a flange 333 and an adaptive stirring paddle 334. The flange 333 is rotatably connected to the second positioning sleeve 332 via a hinge support located outside the second positioning sleeve 332. The adaptive stirring paddle 334 is located outside the flange 333 and is flange-connected to the flange 333. In non-driven conditions, the flange 333 and the adaptive stirring paddle 334 can automatically droop under gravity, reducing the space occupied when not in use. During use, they move upwards and rotate due to centrifugal force. Furthermore, the stirring range of the adaptive stirring paddle 334 can be adjusted by regulating the speed of the stirring motor 31 according to stirring needs.

[0056] More specifically, the adaptive stirring paddle 334 has an asymmetric wedge-shaped structure, with its thin and thick ends connected by a smooth transition. During use, the difference in force between the thin and thick ends of the adaptive stirring paddle 334 creates a dynamic tilting effect, allowing it to automatically adapt to the viscosity and flowability of the stirring medium without the need for additional mechanical devices. For example, when stirring high-viscosity materials, the thick end provides stronger shear force, while the thin end reduces resistance. The overall tilt angle automatically adjusts with changes in resistance, ensuring uniform stirring.

[0057] In one specific implementation, such as Figure 3 and Figure 6 As shown, the first mixing tank 4 has a double-layer jacket structure. A resistance heating wire is wound between the inner and outer layers and filled with thermally conductive silicone grease to enhance the heat conduction efficiency. The heating wire is connected to an external power supply through a flange interface. When energized, it generates Joule heat. The heat is evenly transferred to the medium inside the tank through the inner wall of the jacket, so that the inside of the first mixing tank 4 can be heated by an external power supply during use, so that the internal temperature can be between 50 and 85°C to promote the swelling and dispersion of montmorillonite.

[0058] It should be noted that the winding method of the resistance heating wire and the specific structure for heating by an external power supply are all conventional technical means known to those skilled in the art, and this specification will not elaborate on their specific implementation details.

[0059] In one specific implementation, such as Figure 3 and Figure 8 As shown, the second mixing tank 5 is a lidless barrel-shaped structure, and a self-locking pulley for easy movement is also provided at the lower end of the second mixing tank 5.

[0060] In one specific implementation, such as Figure 3 and Figure 11As shown, the positioning mechanism 6 includes an arc-shaped positioning steel plate 61, which cooperates with a positioning groove on the outer surface of the first mixing tank 4. This facilitates the connection between the positioning mechanism 6 and the first mixing tank 4 by inserting the arc-shaped positioning steel plate 61 into the positioning groove during use. A threaded connecting post 62 is provided at the rear end of the arc-shaped positioning steel plate 61. The threaded connecting post 62 passes through a guide groove on the rear side of the slide groove and is connected to a positioning toothed plate 63 via a positioning nut. The inner side of the positioning toothed plate 63 has a slot that cooperates with a rack on the rear side of the support column, allowing for adjustment of the overall installation height of the positioning mechanism 6 as needed during use, thus facilitating the fixation of the first mixing tank 4.

[0061] The working principle of the agitator used in the production of genuine stone paint includes (taking Example 1 above as an example): Step 1: Add the deionized water weighed according to Example 1 in Table 1 to the first mixing tank 4, control the stirring motor 31 to rotate at a speed of 500 rpm, add nano-montmorillonite to the first mixing tank 4, stir for 6 minutes to form a nano-montmorillonite suspension. Step 2: Place the silicone-modified acrylate emulsion in the second mixing tank 5, remove the pin 323, and drive the drive rod 321 downward by rotating the servo motor and connecting it with the transmission rod 331 (the key 325 is inserted into the keyway 336). Then control the stirring motor 31 to rotate at a speed of 400 rpm and open the drain pipe 41 so that the nano montmorillonite suspension and inorganic slow-release antifungal agent obtained in step 1 are added to the second mixing tank 5 while stirring. Then stir at 900 rpm for 15 minutes to form an organic-inorganic compound functional emulsion. Step 3: Add additives to the organic-inorganic composite emulsion obtained in the second mixing tank 5 in Step 2 above, and stir at 900 rpm for 10 min to obtain the first mixture; Step 4: Continue stirring at 1000 rpm while adding 70% of the composite aggregate (limestone sand, calcined ceramsite sand, hollow microspheres and modified multi-metal powder) to the first mixture in the second mixing tank 5 obtained in Step 3. Stir for 12 minutes and let stand for 4 minutes. Then add the remaining 30% of the composite aggregate and inorganic pigment (iron oxide red), stir at 1100 rpm for 10 minutes, let stand for 5 minutes, and then stir at 1200 rpm for 16 minutes to obtain the real stone paint.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-performance composite aggregate stone-like paint, characterized in that, The mass ratio of materials in the real stone paint is as follows: composite aggregate 71.5~76%, functional emulsion 22.7~27.7%, additives 0.7~0.8%, and inorganic pigments 0~0.5%; The composite aggregate is based on limestone sand and also includes calcined ceramsite sand, hollow microspheres and modified multi-metal powder. The functional emulsion is an organic-inorganic functional emulsion, which uses organosilicon-modified acrylate emulsion as the base emulsion and also includes nano-montmorillonite, inorganic slow-release antifungal agent and deionized water.

2. The high-performance composite aggregate stone paint as described in claim 1, characterized in that, In the composite aggregate, limestone sand accounts for 70.6-71.3% of the main aggregate by mass; calcined ceramsite sand is porous ceramsite sand with a density of 0.6-0.8 kg / m³, accounting for 19.6-21.1% of the main aggregate by mass; the hollow microspheres are fly ash hollow microspheres with a density of 0.4-0.7 kg / m³ and a particle size of 50-150 μm, accounting for 6.6-7.7% of the main aggregate by mass; and modified polymetallic powder accounts for 1.3-1.4% of the main aggregate by mass. In the limestone sand, the proportion of 30-40 mesh particles is 23.5-26.4% by mass, the proportion of 40-80 mesh particles is 54.9-59.3% by mass, and the proportion of 80-120 mesh particles is 16.7-21.6% by mass.

3. A high-performance composite aggregate stone paint as described in claim 1 or 2, characterized in that, The modified multi-metal powder is a multi-metal powder obtained by carbothermic reduction, water quenching and grinding of aluminum-magnesium alloy and titanium alloy waste. Its main components include aluminum, titanium and magnesium elements, with aluminum accounting for 55-65%, titanium accounting for 25-35% and magnesium accounting for 6-10%, and the powder particle size is less than 74μm.

4. The high-performance composite aggregate stone paint as described in claim 1, characterized in that, In the functional emulsion, the silicone-modified acrylic emulsion accounts for 14.5-16.7% of the mass of the stone paint; nano-montmorillonite accounts for 1.1-1.8% of the mass of the stone paint; inorganic slow-release antifungal agent accounts for 0.1-0.2% of the mass of the stone paint; and deionized water accounts for 7-9% of the mass of the stone paint.

5. A high-performance composite aggregate stone paint as described in claim 1 or 4, characterized in that, The inorganic slow-release antifungal agent is composed of at least two of nano-titanium dioxide, nano-alumina, nano-zinc oxide, and silver-loaded zeolite.

6. The high-performance composite aggregate stone paint as described in claim 1, characterized in that, The additives include film-forming aids, antifreeze, defoamers, and preservatives, and their mass percentages in the stone paint are 0.3~0.4%, 0.2~0.3%, 0.1%, and 0.1%, respectively.

7. A high-performance composite aggregate stone paint as described in claim 1 or 6, characterized in that, The film-forming aid is Eastman dodecyl alcohol ester; the antifreeze is a water-soluble alcohol antifreeze, which is either ethylene glycol or propylene glycol; the defoamer is a mineral oil defoamer; and the preservative is KY-LXE multi-system preservative and bactericide.

8. A method for preparing a high-performance composite aggregate stone paint as described in any one of claims 1-7, characterized in that, Including the following steps: (1) Weigh the materials, add the weighed deionized water to a special stirrer, add nano montmorillonite, stir at 400-500 rpm for 5-7 minutes to obtain nano montmorillonite suspension. (2) Place the silicone-modified acrylate emulsion in a special stirrer and stir slowly at 350-400 rpm. While stirring, add the nano-montmorillonite suspension and inorganic slow-release antifungal agent obtained in step (1). Then stir at 900-1000 rpm for 10-15 min to form an organic-inorganic compound functional emulsion. (3) Add defoamer, film-forming aid, antifreeze and preservative to the organic-inorganic composite emulsion obtained in step (2) in sequence, and stir at 900~1000 rpm for 10~12 min to obtain the first mixture; (4) Add 55-70% of the composite aggregate to the first mixture obtained in step (3), stir at 900-1000 rpm for 10-12 min, let stand for 4-5 min, then add the remaining composite aggregate and inorganic pigment, stir at 1100 rpm for 10-12 min, let stand for 5-6 min, and then stir at 1200-1250 rpm for 15-16 min to obtain real stone paint.

9. The method for preparing a high-performance composite aggregate stone paint as described in claim 8, characterized in that, The special mixer includes a frame (1), and a graded mixing mechanism (3), a first mixing tank (4), and a second mixing tank (5) installed on the frame (1); the graded mixing mechanism (3) includes a mixing motor (31), a first mixing component (32), and a second mixing component (33); the first mixing component (32) is located below the mixing motor (31), connected to the mixing motor (31), and extends into the first mixing tank (4); the second mixing component (33) is located at the lower end of the first mixing component (32) and is located inside the second mixing tank (5); the second mixing tank (5) is located directly below the first mixing tank (4); The first mixing assembly (32) includes a drive rod (321) and a rod sleeve (322). The drive rod (321) is mounted on the drive end of the stirring motor (31) via a key shaft. The rod sleeve (322) is movably sleeved on the outside of the drive rod (321), and a plurality of mixing units are also provided on the drive rod (321). The mixing unit includes a first positioning sleeve (324) and a mixing slurry (326). The first positioning sleeve (324) is detachably mounted on the outside of the rod sleeve (322). The mixing slurry (326) consists of symmetrically arranged rectangular blades and is connected to the flange of the first positioning sleeve (324).

10. The method for preparing a high-performance composite aggregate stone paint as described in claim 9, characterized in that, The second mixing assembly (33) includes a transmission rod (331) and several second positioning sleeves (332). The transmission rod (331) is detachably disposed inside the second mixing tank (5). A keyway (336) is provided at the upper end of the transmission rod (331) to cooperate with a locking key (325) provided at the lower end of the drive rod (321). A scraper (335) is also provided at the lower end of the drive rod (321). The scraper (335) cooperates with the inner wall of the second mixing tank (5). The second positioning sleeves... The cylinder (332) is detachably installed on the outside of the transmission rod (331), and a stirring unit is also installed on the second positioning sleeve (332); the stirring unit includes a flange (333) and an adaptive stirring paddle (334). The flange (333) is connected to the second positioning sleeve (332) through a hinge support on the outside of the second positioning sleeve (332). The adaptive stirring paddle (334) is an asymmetric wedge-shaped paddle set on the outside of the flange (333) and is flanged to the flange (333).

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