Amphiphobic and oleophobic artificial agglomerated stone and preparation method thereof

Abstract

The invention discloses an amphiphobic artificial agglomerated stone and a preparation method thereof, and belongs to the field of artificial stone, the amphiphobic artificial agglomerated stone comprises the following raw materials: aggregate: calcium carbonate powder and calcium carbonate granules are mixed to form the aggregate, and the aggregate accounts for 78-88% of the total raw materials; the resin accounts for 10%-17% of the total raw materials; the mass of the initiator is 0.55%-2% of the mass of the resin; the treating agent comprises an aggregate treating agent and a resin treating agent, the using amount of the aggregate treating agent is 0.35%-1.75% of the mass of the aggregate, and the using amount of the resin treating agent is 1%-3.8% of the mass of the resin. The amphiphobic artificial agglomerated stone prepared by the method participates in a resin curing reaction due to the directly added special treating agent instead of an amphiphobic effect formed by a coating mode and the like, can effectively resist erosion of water and oil, and can remarkably improve the durability and applicability by endowing the artificial agglomerated stone with the amphiphobic performance.

Description

Technical Field

[0001] The invention relates to the field of artificial stones, and in particular to an artificial granite with hydrophobic and oleophobic properties and a preparation method thereof. Background Art

[0002] Artificial granite, as a building decoration material with great creativity and practical value, has won wide recognition and application in the fields of modern architectural design and interior decoration with its unparalleled richness of colors, diversity of textures and more affordable cost advantage compared to natural stone. From high-end commercial buildings to warm home spaces, artificial granite, with its varied appearance and stable performance, adds unique visual beauty and practical decorative functions to various places.

[0003] However, although artificial granite performs well in most cases, its inherent material properties become a challenge in certain specific environments, especially in places such as kitchens and bathrooms that are frequently exposed to moisture and oil. Traditional artificial granite is mainly made of a careful mixture of natural marble fragments, finely ground stone powder, and organic resin binders. Although this combination gives it hard and wear-resistant properties, its surface material is not a naturally formed hydrophobic substance. Therefore, when faced with moisture and oil, its hydrophobicity is relatively insufficient. Water molecules are easy to spread on its surface and even penetrate into the interior of the stone, while oil substances are more likely to adhere and may gradually penetrate into the tiny pores of the stone. This will not only cause difficult-to-remove oil stains on the surface, seriously affecting the aesthetics, but also pose a potential threat to hygiene conditions, causing considerable trouble to daily cleaning and maintenance work.

[0004] In order to deal with this problem, the industry usually adopts the method of hydrophobic treatment on the surface of artificial granite, among which the most common method is to add hydrophobic coating. This method is easy to operate and can significantly improve the hydrophobic performance of the stone surface in a short period of time, effectively blocking the invasion of water and oil. However, the only drawback is that hydrophobic coatings are often fragile and not wear-resistant. With the passage of time and the friction and wear in daily use, the coating will gradually peel off, and its hydrophobic effect will be greatly reduced. It needs to be re-sprayed regularly to maintain the effect, which undoubtedly increases the cost of maintenance and replacement.

[0005] Another way to improve the hydrophobicity of artificial granite is to use a special polishing process, which can improve the smoothness and hydrophobicity of the stone surface to a certain extent and reduce the adhesion of water and oil. However, even if the granite is carefully polished, its hydrophobicity will gradually weaken with the passage of time and changes in the use environment, especially in the face of continuous water and oil erosion, its protective effect is even more difficult to last. Summary of the invention

[0006] For this reason, the object of the present invention is to provide a water- and oil-repellent artificial granite and a preparation method thereof. The water- and oil-repellent artificial granite prepared by the innovative method of the present invention benefits from the directly incorporated special treatment agent, which actively participates in the curing process of the resin, rather than merely relying on means such as surface coatings to achieve the water- and oil-repellent properties. This unique design enables the granite to effectively resist the penetration of water and oil, thereby endowing the artificial granite with excellent water- and oil-repellent performance and greatly enhancing its durability and application range.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A water- and oil-repellent artificial granite, comprising the following raw materials:

[0009] Aggregate: composed of a mixture of calcium carbonate powder and calcium carbonate granular material, and the aggregate accounts for 78%-88% of the total raw materials;

[0010] Resin: accounting for 10%-17% of the total raw materials;

[0011] Initiator: 0.55%-2% of the resin quality;

[0012] Treatment agent: including an aggregate treatment agent and a resin treatment agent, wherein the dosage of the aggregate treatment agent is 0.35%-1.75% of the aggregate quality, and the dosage of the resin treatment agent is 1%-3.8% of the resin quality.

[0013] Preferably, the mass ratio of the calcium carbonate powder: calcium carbonate granular material = 10-35:65-90.

[0014] Preferably, the calcium carbonate powder is 300-2500 mesh.

[0015] Preferably, the particle size of the calcium carbonate granular material is 1 mm-25 mm.

[0016] Preferably, the resin is UPR unsaturated polyester resin.

[0017] Preferably, the initiator includes one or more of 2-methyl butanone and boron trifluoride ethyl ether.

[0018] Preferably, the 2-methyl butanone is 0.45%-1.55% of the resin quality, and the boron trifluoride ethyl ether is 0.10%-0.45% of the resin quality.

[0019] Preferably, the aggregate treatment agent includes one or more of tridecafluorooctyltrimethoxysilane, perfluorooctylsilane, and perfluorodecylsilane.

[0020] Preferably, the resin treatment agent includes one or more of trifluoroethyl vinyl ether and fluorovinylsilane.

[0021] The present invention also provides a method for preparing the amphiphilic artificial granite, comprising the following steps:

[0022] (1) After being dried, the aggregate enters a high-speed mixer, an aggregate treatment agent is added, and the mixture is treated at a speed of 100-250 rpm for 10-20 minutes, with the temperature controlled at ≤40°C to obtain treated aggregate;

[0023] (2) The treated aggregate is transferred to a mixer, and resin is added and stirred continuously at a speed of 50-150 rpm. During the process, a styrene solution containing a resin treatment agent is added once, and then an initiator is added dropwise. The temperature is controlled at 30-50° C., and the mixture is fully mixed and stirred until all aggregates are adhered and clumps are formed, and then the mixture is stopped to obtain a mixed material;

[0024] (3) The mixed material is transferred to a mold and subjected to vacuum degassing vibration pressing and molding at a vibration frequency of 15-45 Hz and a pressure of 25-55 MPa. The temperature is controlled at 80-94° C. and the curing is performed for 18-28 hours. The mixed material is then molded to obtain an amphiphilic artificial granite.

[0025] Compared with the prior art, the present invention has the following technical innovations and advantages:

[0026] 1. Innovation of multi-aggregate composite

[0027] 300-2500 mesh calcium carbonate powder and 1mm-25mm calcium carbonate granules are mixed as the aggregate system. This combination of coarse and fine aggregates, on the one hand, the fine powder can fill the tiny gaps between the coarse particles, making the material structure more compact and improving the material's physical properties such as strength and hardness; on the other hand, the distribution of particles of different particle sizes helps to improve the stress distribution inside the material, reduce the stress concentration problem caused by a single particle size aggregate, and thus enhance the overall stability and durability of the material.

[0028] 2. Innovation in the application of special treatment agents

[0029] Aggregate treatment: Perfluorosilanes such as tridecafluorooctyltrimethoxysilane, perfluorooctylsilane, and perfluorodecylsilane are selected as aggregate treatment agents. These perfluorosilanes have extremely low surface energy and can form a stable hydrophobic and oleophobic coating on the surface of calcium carbonate aggregates. This can not only improve the water resistance, oil resistance, and stain resistance of the aggregates themselves, but also effectively improve the interfacial compatibility between the aggregates and the resin after being compounded with the resin. Through chemical bonding or physical adsorption, the bonding force between the aggregates and the resin is enhanced, making the composite material less likely to undergo phase separation during long-term use, improving the comprehensive performance and service life of the material. Resin treatment agent: Trifluorovinyl ether and fluorovinylsilane are used as resin treatment agents. The fluorine element in trifluorovinyl ether and fluorovinylsilane endows the resin treatment agent with good chemical stability and low surface energy characteristics. They can participate in the curing reaction of the resin and introduce fluorine-containing functional groups during the resin curing process, making the matrix formed by the resin have hydrophobic and oleophobic properties. At the same time, these fluorine-containing functional groups can also interact with the aggregate surface treatment agent to further strengthen the interfacial connection between the aggregates and the resin, synergistically improving the overall performance of the composite material, such as weather resistance and corrosion resistance, expanding the application fields of the material, especially suitable for environments with high requirements for waterproofing, oil resistance, and chemical corrosion resistance.

[0030] 3. The double-hydrophobic artificial granite manufactured by the technical solution provided by the present invention has achieved a 3% to 8% improvement in mechanical strength. With this unique formulation and process innovation, the present invention has successfully introduced low-surface-energy groups, which has greatly changed the surface characteristics of the material. Specifically, its hydrophobic performance has been significantly improved, and at the same time, the repulsive force to grease has also been greatly enhanced, which has optimized the adsorption mode of the material to grease to a certain extent. More strikingly, both the water contact angle and the oil contact angle have increased significantly, successfully achieving the dual effects of being both hydrophobic and oleophobic. Therefore, in various application scenarios involving oil pollution protection or oil-water separation, the artificial stone of the present invention can exhibit more excellent performance and effects. Brief Description of the Drawings

[0031] Figure 1 is the appearance diagram of the complete block artificial granite sample prepared in Example 1;

[0032] Figure 2 is the comparison diagram of the droplet state on the surface after the artificial granite is cut into strips; where the left sample C is ordinary artificial granite and the right sample D is the artificial granite of Example 1. Detailed Description of the Invention

[0033] The following is a detailed description of the specific embodiments of the present invention, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0034] In an embodiment of the present invention, a double-repellent artificial granite comprises the following formula raw materials:

[0035] Aggregate: 300-2500 mesh calcium carbonate powder is mixed with 1mm-25mm calcium carbonate granules, wherein the mass ratio of calcium carbonate powder to calcium carbonate granules is 10-35:65-90, and the aggregate accounts for 78%-88% of the total raw materials;

[0036] Resin: UPR unsaturated polyester resin, accounting for 10%-17% of the total raw materials;

[0037] Initiator: 2-methyl butanone and boron trifluoride ethyl ether, wherein 2-methyl butanone is 0.45%-1.55% of the resin mass, and boron trifluoride ethyl ether is 0.10%-0.45% of the resin mass;

[0038] Treatment agent: including aggregate treatment agent and resin treatment agent, wherein the amount of aggregate treatment agent is 0.35%-1.75% of the mass of aggregate; the amount of resin treatment agent is 1%-3.8% of the mass of resin;

[0039] Aggregate treatment agent: perfluorosilanes such as tridecafluorooctyltrimethoxysilane, perfluorooctylsilane, and perfluorodecylsilane. You can choose one or a combination of them.

[0040] Resin treating agent: trifluorovinyl ether, fluorovinyl silane, either one or a combination of them can be used.

[0041] A method for preparing an amphiphilic artificial granite comprises the following steps:

[0042] (1) After being dried, the aggregate enters a high-speed mixer, an aggregate treatment agent is added, and the mixture is treated at a speed of 100-250 rpm for 10-20 minutes, with the temperature controlled at ≤40°C to obtain treated aggregate;

[0043] (2) The treated aggregate is transferred to a mixer, and UPR unsaturated polyester resin is added and stirred continuously at a speed of 50-150 rpm. During the process, a styrene solution containing a resin treatment agent is added at one time, and then 2-methyl butanone and boron trifluoride ether are added dropwise. The temperature is controlled at 30-50° C., and the mixture is fully mixed and stirred until all aggregates are adhered and clumped, and then the mixture is stopped to obtain a mixed material;

[0044] (3) The mixed material is transferred to a mold and subjected to vacuum degassing vibration pressing and molding at a vibration frequency of 15-45 Hz and a pressure of 25-55 MPa. The temperature is controlled at 80-94° C. and the curing is performed for 18-28 hours. The mixed material is then molded to obtain an amphiphilic artificial granite.

[0045] The technical principle of preparing the double-repellent artificial granite of the present invention is as follows:

[0046] 1. Specific role of raw materials

[0047] 1. Aggregate

[0048] The present invention uses 300-2500 mesh calcium carbonate powder and 1mm-25mm calcium carbonate granules as the aggregate system. The calcium carbonate powder has a fine particle size and can fill the gaps between coarse particles, making the material structure dense, improving strength and hardness, and laying a solid foundation for the granite. Particles of different particle sizes complement each other, the coarse particles are supported by force, and the fine powder optimizes the microstructure, improves stress distribution, avoids stress concentration, and enhances material stability and durability, making the granite durable and not easy to break.

[0049] 2. Resin

[0050] UPR unsaturated polyester resin is selected as the binder, which plays an important "bridge" role in the double-phobic artificial granite. On the one hand, it can tightly bond the dispersed aggregates together, so that the aggregates form an organic whole and ensure the molding of the material; on the other hand, it has a certain flexibility, which can buffer the external force impact on the material during use, prevent the aggregate from falling off or breaking due to external forces, and cooperate with the aggregate to ensure the mechanical properties of the material. Moreover, as a matrix material, the resin lays the foundation for the subsequent introduction of hydrophobic and oleophobic properties, and through interaction with the treatment agent, the overall performance of the material is improved.

[0051] 3. Initiator

[0052] It is composed of 2-methyl butyl ketone and boron trifluoride ethyl ether. 2-methyl butyl ketone is 0.45%-1.55% of the resin mass, and boron trifluoride ethyl ether is 0.10%-0.45% of the resin mass. They play a key role as "catalysts" in the curing process of the resin. The initiator can trigger a cross-linking reaction between resin molecules, prompting the resin to quickly transform from liquid to solid, and realize the molding and curing of the material.

[0053] 4. Treatment agent

[0054] Aggregate treatment agent: Perfluorosilanes such as tridecafluorooctyltrimethoxysilane, perfluorooctylsilane, and perfluorodecylsilane are selected, and the dosage is 0.35%-1.75% of the aggregate mass. These perfluorosilanes have unique extremely low surface energy characteristics. When they come into contact with calcium carbonate aggregates, a stable hydrophobic and oleophobic coating is evenly formed on the aggregate surface. This not only significantly improves the aggregate's own resistance to external water and oil, enhances water resistance, oil resistance, and stain resistance, and avoids problems such as erosion and deterioration of the aggregate due to long-term contact with moisture or oil. More importantly, during subsequent compounding with the resin, this coating can, through chemical bonding or physical adsorption, greatly improve the originally possible interfacial incompatibility problem between the aggregate and the resin, strongly enhance the bonding force between the two, so that the composite material can always maintain a tight structural connection during long-term use, is not prone to phase separation, and ensures the durability and stability of the material properties.

[0055] Resin treatment agent: Trifluorovinyl ether and fluorovinylsilane are used, and the dosage is 1%-3.8% of the resin mass. The fluorine elements they contain endow them with good chemical stability and low surface energy characteristics. During the resin curing process, these treatment agents can deeply participate in the reaction and subtly introduce fluorine-containing functional groups into the resin matrix. On the one hand, it makes the matrix formed after resin curing have excellent hydrophobic and oleophobic properties, fundamentally improving the material's protection ability; on the other hand, these fluorine-containing functional groups can actively interact with the aggregate surface treatment agent, further strengthening the originally improved interfacial connection between the aggregate and the resin, forming a tightly intertwined synergistic action network, jointly improving the overall performance of the composite material. For example, in a complex and changeable outdoor environment, it significantly improves the material's weather resistance, enabling it to resist ultraviolet rays, wind and rain erosion, and in special places such as the chemical industry, it shows excellent corrosion resistance, greatly expanding the application field of the material and meeting the special environmental requirements with extremely high requirements for waterproof, oil-proof and chemical corrosion resistance.

[0056] II. Synergistic effect between raw materials

[0057] 1. Aggregate and resin: The coarse and fine aggregate provides a good attachment basis for the resin, and the resin binds the aggregate into a solid whole. The two cooperate closely to ensure the basic mechanical properties of the material. At the same time, a stronger chemical bonding and physical adsorption effect is formed between the aggregate treated with the treatment agent and the resin, further enhancing the bonding strength. When the material is stressed, the aggregate and the resin resist the external force synergistically, avoiding structural damage.

[0058] 2. Aggregate treatment agent and resin treatment agent: The aggregate treatment agent constructs a hydrophobic and oleophobic coating on the surface of the aggregate to improve the self-performance of the aggregate and its compatibility with the resin; the resin treatment agent introduces fluorine-containing functional groups during the resin curing process to endow the resin with hydrophobic and oleophobic properties and strengthen the interfacial connection ability. The two interact with each other, and the fluorine-containing functional groups and the aggregate treatment agent synergistically enhance the effect, forming a tight protection and connection system at the interface between the aggregate and the resin, comprehensively improving the water resistance, oil resistance, weather resistance and corrosion resistance of the material, and achieving a comprehensive performance improvement effect of 1 + 1 > 2.

[0059] 3. Initiator and resin: The initiator precisely initiates the resin curing reaction to ensure that the resin changes from a liquid state to a solid state at an appropriate time and rate and tightly combines with the aggregate to form a shape. Its dosage is perfectly matched with the resin, which not only ensures the full curing of the resin but also prevents overreaction, creating a stable matrix condition for other raw materials to play their roles synergistically and guaranteeing the final forming quality of the double-hydrophobic artificial granite.

[0060] III. Necessity and importance of process parameter optimization

[0061] 1. Control of raw material dosage

[0062] The aggregate accounts for 78% - 88% of the total raw materials, and the resin accounts for 10% - 17%. This specific proportion combination is obtained through repeated experimental optimization. If the aggregate content is too high and the resin is relatively insufficient, the resin cannot fully wrap and bond the aggregate, resulting in a loose material structure and a significant decrease in strength; conversely, if there is too much resin, the cost increases and the material is prone to problems such as excessive toughness and insufficient rigidity, affecting the actual use performance of the granite. The dosages of the initiator and the treatment agent are also strictly precise. As mentioned above, their slight changes will have a significant impact on the resin curing effect and the bonding effect between the aggregate and the resin, which is directly related to the final performance of the double-hydrophobic artificial granite.

[0063] 2. Process parameter optimization

[0064] In the aggregate treatment process, the dried aggregate enters the high-speed mixer, the rotation speed is controlled at 100 - 250 rpm, the treatment time is 10 - 20 min, and the temperature ≤ 40°C. If the rotation speed is too low or the time is too short, the aggregate treatment agent cannot uniformly and fully coat the surface of the aggregate, affecting the formation effect of the hydrophobic and oleophobic coating; if the rotation speed is too high, the time is too long or the temperature is too high, it may cause the volatilization loss of the treatment agent, and the ideal treatment effect cannot be achieved either, thus weakening the synergistic performance improvement between the aggregate and the resin.

[0065] In the mixing stage, when the treated aggregate is mixed with the resin, the speed is 50-150rpm, and the styrene solution containing the resin treatment agent is added once during the process, and then the initiator is added dropwise, and the temperature is 30-50℃. The appropriate speed ensures that the materials are fully mixed without damaging the surface coating of the treated aggregate. The precise temperature control provides the best environment for the fusion of resin and aggregate, the reaction of the resin treatment agent, and the action of the initiator, ensuring the smooth synergistic reaction of each raw material.

[0066] In the molding process, the mixture is transferred to the mold and vacuum-debubbled and vibrated to form, with a vibration frequency of 15-45Hz, a pressure of 25-55MPa, and a controlled temperature of 80-94℃ for curing for 18-28h. The synergistic effect of vibration frequency and pressure can effectively expel bubbles from the mixture, making the internal structure of the material more dense and uniform. If the parameters are inappropriate, residual bubbles will cause internal defects in the material, reducing strength and waterproof properties; curing temperature and time directly determine the degree of resin curing and the performance of the final product. If the temperature is too low and the time is too short, the resin will not be completely cured, the material will become soft and have poor performance. If the temperature is too high and the time is too long, the material may discolor, crack, and deteriorate its mechanical properties. Through the fine optimization of these process parameters, it is ensured that the raw materials in the preparation process of the double-repellent artificial granite can fully exert their synergistic effect, and an unexpected excellent technical effect far exceeding the traditional process has been achieved, and a double-repellent artificial granite product with excellent performance and wide application has been prepared.

[0067] In summary, by precisely controlling the raw material components and process parameters of the amphiphobic artificial granite, efficient synergy between the raw materials can be achieved, and amphiphobic artificial granite with excellent performance can be prepared, which has broad application prospects in the fields of architectural decoration and so on.

[0068] In order to make the disclosure of the present invention more complete, it is described below through more specific embodiments.

[0069] Example 1

[0070] A double-repellent artificial granite, comprising the following raw materials:

[0071] Aggregate: 8.8kg calcium carbonate powder, 79.2kg calcium carbonate granules, total 88kg;

[0072] UPR unsaturated polyester resin: 12kg;

[0073] Aggregate treatment agent: 0.44kg perfluorooctylsilane;

[0074] Resin treating agent: 0.012 kg trifluorovinyl ether, dispersed in styrene for later use;

[0075] Initiator: 0.054 kg-2-methyl butyl ketone and 0.024 kg-boron trifluoride etherate.

[0076] The preparation method of the double-repellent artificial granite comprises the following steps:

[0077] (1) After being dried, the aggregate enters a high-speed mixer, an aggregate treatment agent is added, and the mixture is treated at a speed of 100 rpm for 10 min and a temperature of 25°C to obtain treated aggregate;

[0078] (2) The treated aggregates are transferred to a mixer, and UPR unsaturated polyester resin is added and stirred continuously at a speed of 75 rpm. During the process, a styrene solution containing a resin treatment agent is added at one time, and then 2-methyl butanone and boron trifluoride ether are added dropwise. The temperature is controlled at 35° C. and the mixture is fully mixed and stirred until all aggregates are adhered and clumped, and then the mixture is stopped to obtain a mixed material;

[0079] (3) The mixed material is transferred to a mold and subjected to vacuum degassing vibration pressing molding at a vibration frequency of 30 Hz and a pressure of 45 MPa. The temperature is controlled at 85° C. and cured for 24 hours. The mixed material is then molded to obtain an amphiphilic artificial granite. The artificial granite is treated to obtain Figure 1 The appearance of a complete block of artificial granite sample.

[0080] Example 2

[0081] A double-repellent artificial granite, comprising the following raw materials:

[0082] Aggregate: 17kg calcium carbonate powder, 68kg calcium carbonate granules, total 85kg;

[0083] UPR unsaturated polyester resin: 15kg;

[0084] Aggregate treatment agent: 0.8kg perfluorodecylsilane;

[0085] Resin treatment agent: 0.15 kg trifluorovinyl ether and 0.15 kg fluorovinyl silane, dispersed in styrene for later use;

[0086] Initiator: 150 g of 2-methyl butyl ketone and 50 g of boron trifluoride etherate.

[0087] The preparation method of the double-repellent artificial granite comprises the following steps:

[0088] (1) After being dried, the aggregate enters a high-speed mixer, an aggregate treatment agent is added, and the mixture is treated at a speed of 100 rpm for 15 minutes and a temperature of 35°C to obtain treated aggregate;

[0089] (2) The treated aggregates are transferred to a mixer, and UPR unsaturated polyester resin is added and stirred continuously at a speed of 100 rpm. During the process, a styrene solution containing a resin treatment agent is added at one time, and then 2-methyl butanone and boron trifluoride ether are added dropwise. The temperature is controlled at 35° C. and the mixture is fully mixed and stirred until all aggregates are adhered and clumped, and then the mixture is stopped to obtain a mixed material;

[0090] (3) The mixture is transferred to a mold and formed by vibration pressing after vacuum degassing. The vibration frequency is 35 Hz, the pressure is 50 MPa, and it is cured at 90 °C for 24 h to form a double-hydrophobic artificial granite.

[0091] Comparative Example 1

[0092] Ordinary artificial granite is a commodity purchased from the market. The formula is: 100 parts of unsaturated polyester resin, 180 parts of calcium carbonate, 2 parts of curing agent, and 1.5 parts of accelerator.

[0093] Preparation method: The resin and calcium carbonate are fully stirred and mixed, the curing agent and accelerator are added and mixed continuously, and then poured into a mold, vacuum oscillated to exhaust air, and formed. After that, it is cured at a constant temperature of 90 °C for 24 h.

[0094] Performance testing of artificial granite:

[0095] 1. After cutting the artificial granite prepared in Example 1 and the artificial granite prepared in Comparative Example 1, the hydrophobic and oleophobic properties of the surface droplet state were compared. The results are shown in Figure 2 and Table 1.

[0096] 2. According to the national standard GBT 35157-2017 "Resin-type synthetic stone plates", the compressive strength, flexural strength, water contact angle, and oil contact angle of the artificial granite prepared in Examples 1 and 2 and the artificial granite prepared in Comparative Example 1 were detected. The results are shown in Table 1.

[0097] Table 1 Test results

[0098] Serial number Compressive strength Flexural strength Water-contact angle Oil-contact angle Comparative example 1 107.36 MPa 18.75 MPa 66.5° 32.7° Example 1 110.55 MPa 19.36 MPa 100.7° 61.4° Example 2 113.22 MPa 20.34 MPa 105.4° 66.8°

[0099] It can be seen from Table 1 that for the artificial granite prepared in Example 1 and Example 2 of the present invention, compared with the product of Comparative Example 1, the key performance indicators have significant advantages.

[0100] The compressive strength of the material is increased by 3.0%-5.5%, which enables it to stably bear the load in actual scenarios such as heavy object backlog and building stress, reducing the risk of compression damage and deformation, and ensuring long-term reliable use. The flexural strength is increased by 3.3%-8.5%, which allows the artificial granite to build complex shapes with excellent bending resistance in scenarios that require bending and folding, and can also ensure the structural stability, avoiding fracture and breakage during processing and use, and broadening the design application boundary.

[0101] The artificial granite of Example 1 and Example 2 of the present invention has made breakthrough progress in the key indicators of material surface characteristics such as water contact angle and oil contact angle compared with Comparative Example 1.

[0102] The water contact angle is significantly increased by 51.4% - 58.5%, and the surface of the material changes from hydrophilic to hydrophobic. It can prevent moisture and water in outdoor exterior walls, kitchens and bathrooms where it is humid and water-rich, avoid mildew and corrosion, and extend the service life and the maintenance period of aesthetics.

[0103] The oil contact angle is increased by 87.8% - 104.3%, and the repulsion of the material to oil stains is enhanced. In mechanical workshops, catering kitchens and other places, it can prevent the adhesion and penetration of oil stains, reduce the cleaning and maintenance costs, and keep the environment clean. The improvement of the surface performance is due to the unique formula and fine process, accurately introducing low surface energy groups, changing the surface properties of the material from the micro level, achieving waterproof and moisture-proof, strong oil repellency, and achieving a double-hydrophobic effect. It performs outstandingly in scenarios such as oil pollution prevention and oil-water separation, and can contribute to the development of multiple fields.

[0104] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, any improvements and adjustments made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A double-repellent artificial granite, characterized in that: Including the following ingredients: Aggregate: It is a mixture of calcium carbonate powder and calcium carbonate granules, and aggregate accounts for 78%-88% of the total raw materials; Resin: 10%-17% of total raw materials; Initiator: 0.55%-2% of the resin mass; Treatment agent: including aggregate treatment agent and resin treatment agent, wherein the amount of aggregate treatment agent is 0.35%-1.75% of the mass of aggregate, and the amount of resin treatment agent is 1%-3.8% of the mass of resin.

2. The double-repellent artificial granite according to claim 1, characterized in that: The mass ratio of the calcium carbonate powder to the calcium carbonate particles is 10-35:65-90.

3. The double-repellent artificial granite according to claim 2, characterized in that: The calcium carbonate powder has a mesh size of 300-2500.

4. The double-repellent artificial granite according to claim 2, characterized in that: The particle size of the calcium carbonate particles is 1mm-25mm.

5. The double-repellent artificial granite according to claim 1, characterized in that: The resin is UPR unsaturated polyester resin.

6. The double-repellent artificial granite according to claim 1, characterized in that: The initiator includes one or more of 2-methyl butanone and boron trifluoride etherate.

7. The double-repellent artificial granite according to claim 6, characterized in that: The 2-methyl butanone accounts for 0.45%-1.55% of the resin mass, and the boron trifluoride etherate accounts for 0.10%-0.45% of the resin mass.

8. The double-repellent artificial granite according to claim 1, characterized in that: The aggregate treating agent includes one or more of tridecafluorooctyltrimethoxysilane, perfluorooctylsilane and perfluorodecylsilane.

9. The double-repellent artificial granite according to claim 1, characterized in that: The resin treatment agent includes one or more of trifluorovinyl ether and fluorovinyl silane.

10. A method for preparing the amphiphilic artificial granite according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) After being dried, the aggregate enters a high-speed mixer, an aggregate treatment agent is added, and the mixture is treated at a speed of 100-250 rpm for 10-20 minutes, with the temperature controlled at ≤40°C to obtain treated aggregate; (2) The treated aggregate is transferred to a mixer, and resin is added and stirred continuously at a speed of 50-150 rpm. During the process, a styrene solution containing a resin treatment agent is added once, and then an initiator is added dropwise. The temperature is controlled at 30-50° C., and the mixture is fully mixed and stirred until all aggregates are adhered and clumps are formed, and then the mixture is stopped to obtain a mixed material; (3) The mixed material is transferred to a mold and subjected to vacuum degassing vibration pressing and molding at a vibration frequency of 15-45 Hz and a pressure of 25-55 MPa. The temperature is controlled at 80-94° C. and the curing is performed for 18-28 hours. The mixed material is then molded to obtain an amphiphilic artificial granite.

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