Leather surface granite and preparation process thereof

Abstract

The invention relates to the technical field of stone surface polishing, and particularly discloses leather-surface granite and a preparation process thereof. Comprising the following steps: S1, selecting a coarse grinding abrasive, a fine grinding abrasive and a polishing abrasive according to the Mohs hardness of granite; s2, the surface of the granite is subjected to rough grinding, fine grinding and polishing in sequence; before polishing, acid pickling and polishing agent spraying are sequentially conducted on the surface of the granite subjected to fine grinding, and the polishing agent is prepared from, by weight, 15-18 parts of grinding materials, 2-5 parts of sodium dodecyl sulfate, 10-15 parts of acetic acid, 10-12 parts of sodium chromate, 20-30 parts of modified polyacrylate and 5-10 parts of water; wherein the grinding material is a mixture of silicon carbide powder and silicon dioxide powder. The leather surface granite produced by the preparation process is obvious in concave-convex feeling, relatively high in glossiness, low in surface roughness, not easy to smudge and easy to clean.

Description

Technical Field

[0001] The invention relates to the technical field of stone surface polishing, in particular to leather-faced granite and a preparation process thereof. Background Art

[0002] Granite is a common decorative stone. In the process of producing granite, the surface of granite needs to be ground and polished to form a leather surface, which has an anti-slip function. Granite leather surface production is a production technology that processes the granite surface into a leather-like surface; the leather surface of granite includes flamed surface (the surface is flamed), litchi surface (diamond head hammering), sandblasted surface or water-washed surface according to different processes.

[0003] Although the existing anti-slip treated granite has the anti-slip function, the leather surface is not concave and convex, the surface is rough, difficult to clean, easy to get dirty, and has low glossiness. At the same time, it cannot fully present the texture and beauty that granite should have. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of leather-faced granite. The leather-faced granite produced by the preparation process not only has obvious concave-convex feeling and high glossiness, but also has reduced surface roughness, is not easy to get dirty and is easy to clean.

[0005] In addition, the present invention also provides leather-faced granite prepared by the above-mentioned preparation process.

[0006] The present invention is achieved through the following technical solutions:

[0007] A preparation process of leather-faced granite comprises the following steps:

[0008] S1. Select coarse grinding abrasive, fine grinding abrasive and polishing abrasive according to the Mohs hardness of granite, and design the coarse grinding air pressure, fine grinding air pressure and polishing air pressure;

[0009] When the Mohs hardness of granite is greater than or equal to 6, the coarse grinding abrasives are No. 36 carbon silicon brush, No. 60 diamond brush and No. 120 diamond brush; the fine grinding abrasives are No. 500 diamond brush and No. 1500 diamond brush; the polishing abrasives are No. 5 polishing brush and No. 6 polishing brush;

[0010] When the Mohs hardness of granite is less than 6, use No. 60 diamond brush and No. 3 leather brush for coarse grinding; No. 4 leather brush and No. 5 leather brush for fine grinding; No. 6 leather brush for polishing.

[0011] S2. Coarse grinding, fine grinding and polishing are sequentially performed on the surface of the granite; and before polishing, the finely ground granite surface is pickled and sprayed with a polishing agent in sequence, wherein the polishing agent includes the following components in parts by weight:

[0012] 15-18 parts of abrasive, 2-5 parts of sodium dodecyl sulfonate, 10-15 parts of acetic acid, 10-12 parts of sodium chromate, 20-30 parts of modified polyacrylate, and 5-10 parts of water; wherein the abrasive is a mixture of silicon carbide powder and silicon dioxide powder.

[0013] Firstly, the present invention classifies granite based on Mohs hardness of 6, designs corresponding coarse grinding abrasives, fine grinding abrasives and polishing abrasives for granite with Mohs hardness greater than or equal to 6 and granite with Mohs hardness less than 6, and designs coarse grinding air pressure, fine grinding air pressure and polishing air pressure; the granite is coarsely ground, finely ground and polished by matching abrasives with equipment to achieve a concave-convex anti-slip effect on the surface of the granite, and the glossiness of the surface of the granite is improved, and at the same time, the surface roughness is reduced, and the granite is not easy to be dirty and easy to clean.

[0014] Secondly, the present invention sequentially pickles and sprays the polishing agent before polishing the granite. The present invention optimizes the formula of the polishing agent used, which can further improve the glossiness of the granite surface and reduce the roughness, so that the prepared granite has both obvious concave-convex feeling and smoothness, wherein the concave-convex feeling realizes anti-slip, and the smoothness can reduce the roughness and facilitate the cleaning of the granite surface; at the same time, the glossiness of the granite is improved, and the texture and beauty of the granite can be better presented.

[0015] The present invention adopts a combination of silicon carbide powder and silicon dioxide powder to improve the polishing effect, and is combined with acetic acid, sodium chromate and modified polyacrylate to effectively improve the gloss of the polished granite; wherein acetic acid is an acidic substance that can improve the gloss of granite, sodium chromate is a metal salt that can improve the gloss of granite, and modified polyacrylate is a high molecular polymer that can improve the gloss of granite. The combination of the three produces a synergistic effect, and the gloss of the granite can be significantly improved.

[0016] In summary, the leather-surface granite produced by the preparation process of the present invention not only has obvious concave-convex feeling and high glossiness, but also has reduced surface roughness, is not easy to get dirty, and is easy to clean.

[0017] In a preferred embodiment, the air pressure for coarse grinding of granite with different Mohs hardness is 0.1 MPa; the air pressure for fine grinding and polishing is 0.02-0.06 MPa.

[0018] In a preferred embodiment, when the Mohs hardness of granite is greater than or equal to 6, the preparation process of leather-faced granite is:

[0019] S21. Use a No. 36 carbon silicon brush to polish the granite surface at an air pressure of 0.1Mpa;

[0020] S22. Use a No. 60 diamond brush to polish the granite surface; the air pressure is 0.02-0.06Mpa;

[0021] S23. Use No. 120 diamond brush and No. 500 diamond brush to polish the granite surface; the air pressure is 0.02-0.06Mpa;

[0022] S24, pickling and spraying polishing agent in turn, using No. 1500 diamond brush, No. 5 polishing brush and No. 6 polishing brush to polish the granite surface, the air pressure is 0.02-0.06Mpa.

[0023] In a preferred embodiment, the usage of No. 60 diamond brush, No. 120 diamond brush, No. 500 diamond brush, No. 1500 diamond brush and No. 6 polishing brush is twice that of No. 36 carbon silicon brush; the usage of No. 5 polishing brush is 4 times that of No. 36 carbon silicon brush.

[0024] In a preferred embodiment, in step S21, if the leather surface to be processed is a litchi surface, before using a No. 36 carbon silicon brush to polish the granite surface, the granite surface is first polished with a litchi head to form a litchi surface on the granite surface, and the air pressure is 0.1 Mpa.

[0025] In a preferred embodiment, when the Mohs hardness of granite is less than 6, the leather surface granite is prepared as follows:

[0026] S2a, use a No. 60 diamond brush to polish the granite surface with an air pressure of 0.1Mpa;

[0027] S2b, use No. 3 leather brush, No. 4 leather brush and No. 5 leather brush to polish the granite surface in turn, and the air pressure is 0.02-0.06Mpa;

[0028] S2c, pickling and spraying polishing agent in turn, and polishing the granite surface with a No. 6 leather brush; the air pressure is 0.02-0.06Mpa.

[0029] In a preferred embodiment, the usage of No. 3 leather brush is 1-1.5 times that of No. 60 diamond brush; the usage of No. 4 leather brush and No. 5 leather brush is 2 times that of No. 60 diamond brush; the usage of No. 6 leather brush and No. 5 leather brush is 3 times that of No. 60 diamond brush.

[0030] In a preferred embodiment, in step S2a, if the granite surface is uneven, a No. 50 iron plate is used to grind the granite surface first, and then a No. 60 diamond brush is used to grind the granite surface after the granite surface is ground flat.

[0031] In a preferred embodiment, in step S2, the preparation process of the modified polyacrylate in the polishing agent is as follows:

[0032] Methyl methacrylate and butyl acrylate in a mass ratio of 1:1, dodecafluoroheptyl methacrylate, a nonionic surfactant and a crosslinking agent are prepared into a core layer emulsion; methyl methacrylate and butyl acrylate in a mass ratio of 1:3, dodecafluoroheptyl methacrylate, a nonionic surfactant and a crosslinking agent are prepared into a shell layer emulsion;

[0033] After ultrasonically dispersing the core layer emulsion, adjust the pH value to 8-10, heat it to 80-90°C, and drop potassium persulfate solution; keep warm for 20-30 minutes, then ultrasonically disperse the shell layer emulsion and heat it to 80-90°C, add it to the core layer emulsion, drop potassium persulfate solution, keep warm for 60-80 minutes; cool and filter to obtain modified polyacrylate.

[0034] The modified polyacrylate of the present invention is fluorine-silicon modified, which can be beneficial to improving the glossiness of the polished granite.

[0035] A leather-faced granite prepared by the above-mentioned preparation process.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] The invention classifies granite based on the Mohs hardness of 6, designs corresponding coarse grinding abrasives, fine grinding abrasives and polishing abrasives for granite with a Mohs hardness of 6 or more and granite with a Mohs hardness of less than 6, respectively, designs coarse grinding air pressure, fine grinding air pressure and polishing air pressure, and sequentially carries out pickling and spraying of polishing agent before polishing the granite, and optimizes the formula of the polishing agent used; the prepared granite has both obvious concave-convex feeling and smoothness; at the same time, the granite's glossiness is improved, and the texture and beauty of the granite can be better presented. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0039] Figure 1 This is a rendering of the lychee noodles in Example 1 of the present invention;

[0040] Figure 2 This is a rendering of the sandblasted surface in Example 1 of the present invention;

[0041] Figure 3 This is a rendering of the leather-faced granite prepared in Example 1 of the present invention;

[0042] Figure 4 The effect of the leather-faced granite prepared in Example 2 of the present invention Figure 1 ;

[0043] Figure 5 The effect of the leather-faced granite prepared in Example 2 of the present invention Figure 2 ;

[0044] Figure 6 The effect of the leather-faced granite prepared in Example 2 of the present invention Figure 1 ;

[0045] Figure 7 The effect of the leather-faced granite prepared in Example 2 of the present invention Figure 2 . DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0047] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those of ordinary skill in the art that these specific details do not have to be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described. The materials, instruments and reagents used in the following examples, unless otherwise specified, can be obtained from commercial sources. The technical means used in the examples, unless otherwise specified, are conventional means well known to those skilled in the art.

[0048] All the brush heads used in this embodiment, including the No. 36 carbon silicon brush, No. 60 diamond brush, No. 120 diamond brush, No. 500 diamond brush, No. 1500 diamond brush, No. 5 polishing brush, No. 6 polishing brush, No. 3 leather brush, No. 4 leather brush, No. 5 leather brush and No. 6 leather brush, were purchased, some of which were purchased from the auxiliary material supply department of Quanzhou Lizhongwang in Fujian. The numbers in different brush heads are well known in the art. For example, people in the industry know what kind of diamond brush No. 60 is.

[0049] A preparation process of leather-faced granite comprises the following steps:

[0050] S1. Select coarse grinding abrasive, fine grinding abrasive and polishing abrasive according to the Mohs hardness of granite, and design the coarse grinding air pressure, fine grinding air pressure and polishing air pressure. The coarse grinding air pressure of granite with different Mohs hardness is 0.1Mpa; the fine grinding air pressure and polishing air pressure are 0.02-0.06Mpa;

[0051] When the Mohs hardness of granite is greater than or equal to 6, the coarse grinding abrasives are No. 36 carbon silicon brush, No. 60 diamond brush and No. 120 diamond brush; the fine grinding abrasives are No. 500 diamond brush and No. 1500 diamond brush; the polishing abrasives are No. 5 polishing brush and No. 6 polishing brush;

[0052] When the Mohs hardness of granite is less than 6, use No. 60 diamond brush and No. 3 leather brush for coarse grinding; No. 4 leather brush and No. 5 leather brush for fine grinding; No. 6 leather brush for polishing.

[0053] S2. Coarse grinding, fine grinding and polishing are sequentially performed on the surface of the granite; and before polishing, the finely ground granite surface is pickled and sprayed with a polishing agent in sequence, wherein the polishing agent includes the following components in parts by weight:

[0054] 15-18 parts of abrasive, 2-5 parts of sodium dodecyl sulfonate, 10-15 parts of acetic acid, 10-12 parts of sodium chromate, 20-30 parts of modified polyacrylate, and 5-10 parts of water; wherein the abrasive is a mixture of silicon carbide powder and silicon dioxide powder.

[0055] The preparation process of modified polyacrylate is as follows:

[0056] A core layer emulsion is prepared by mixing methyl methacrylate and butyl acrylate in a mass ratio of 1:1, dodecafluoroheptyl methacrylate, a nonionic surfactant, glyceryl monostearate, and a crosslinking agent, 3-aminopropyl triethoxysilane; wherein the amount of dodecafluoroheptyl methacrylate is 20% of the total mass of methyl methacrylate and butyl acrylate, the amount of glyceryl monostearate is 8% of the total mass of methyl methacrylate and butyl acrylate; and the amount of 3-aminopropyl triethoxysilane is 15% of the total mass of methyl methacrylate and butyl acrylate; a shell layer emulsion is prepared by mixing methyl methacrylate and butyl acrylate in a mass ratio of 1:3, dodecafluoroheptyl methacrylate, a nonionic surfactant, and a crosslinking agent, wherein the amount of glyceryl monostearate is 8% of the total mass of methyl methacrylate and butyl acrylate; and the amount of 3-aminopropyl triethoxysilane is 15% of the total mass of methyl methacrylate and butyl acrylate;

[0057] The core layer emulsion is ultrasonically dispersed for 30 minutes, the pH value is adjusted to 9 with NaHCO3, the temperature is raised to 85°C, a potassium persulfate solution with a mass fraction of 1.5% is added dropwise, and the amount of the potassium persulfate solution is 2% based on the sum of the mass of methyl methacrylate and butyl acrylate in the shell layer emulsion; the temperature is kept for 20-30 minutes, and then the shell layer emulsion is ultrasonically dispersed and the temperature is raised to 85°C and added to the core layer emulsion, and a potassium sulfate solution with a mass fraction of 1.5% is added dropwise, and the amount of the potassium persulfate solution is 2% based on the sum of the mass of methyl methacrylate and butyl acrylate in the shell layer emulsion; the reaction is kept for 80 minutes; cooling and filtering are performed to obtain modified polyacrylate.

[0058] In this embodiment, granite is classified based on the Mohs hardness of 6, and corresponding coarse grinding abrasives, fine grinding abrasives and polishing abrasives are designed for granite with a Mohs hardness greater than or equal to 6 and granite with a Mohs hardness less than 6, and the coarse grinding air pressure, fine grinding air pressure and polishing air pressure are designed. At the same time, before the granite is polished, it is first pickled and sprayed with a polishing agent in sequence, and the formula of the polishing agent used is optimized and designed; the prepared granite has both obvious concave-convex feeling and smoothness; at the same time, the granite's glossiness is improved, and the texture and beauty of granite can be better presented.

[0059] In order to better illustrate the technical effect of this embodiment, the following specific cases are used for illustration:

[0060] Embodiment 1:

[0061] This embodiment takes lychee-faced granite with a Mohs hardness of 6 or above as an example.

[0062] A method for preparing leather-faced granite comprises the following steps:

[0063] S21. Use a litchi grinder to grind the granite to form a litchi surface. The air pressure is 0.1Mpa (for the boards with flamed and sandblasted surfaces, there is no need to use a litchi grinder. They can be directly used for rough grinding). The effect of the litchi surface is as follows: Figure 1 As shown, the effect of sandblasting surface is as follows Figure 2 As shown in the figure; the surface of the litchi surface and the sandblasted surface is rough, easy to get dirty, and dull;

[0064] Then use the No. 36 carbon silicon brush to polish the granite surface, with the air pressure of 0.1Mpa, to grind the rough particles on the granite surface, thus saving the life of the subsequent brush;

[0065] S22. Use a No. 60 diamond brush to polish the granite surface; further enhance the concave and convex feeling of the granite surface, and repair the brush marks of the lychee head polishing; the air pressure is 0.04Mpa to prevent excessive pressure from causing deformation of the abrasive or incomplete repair of the brush marks;

[0066] S23, use No. 120 diamond brush and No. 500 diamond brush to polish the granite surface and further repair the polishing marks of the lychee head; the air pressure is 0.04Mpa;

[0067] S24, pickling (20% hydrochloric acid), spraying polishing agent, using No. 1500 diamond brush, No. 5 polishing brush and No. 6 polishing brush to polish the rough position of the litchi surface, the air pressure is 0.04Mpa.

[0068] Wherein, the polishing agent is composed of the following components by weight:

[0069] 18 parts of abrasive, 4 parts of sodium dodecyl sulfonate, 12 parts of acetic acid, 12 parts of sodium chromate, 25 parts of modified polyacrylate, and 8 parts of water; wherein the abrasive is a mixture of silicon carbide powder and silicon dioxide powder in equal proportions.

[0070] In this embodiment, the usage of No. 60 diamond brush, No. 120 diamond brush, No. 500 diamond brush, No. 1500 diamond brush and No. 6 polishing brush is twice that of No. 36 carbon silicon brush; the usage of No. 5 polishing brush is 4 times that of No. 36 carbon silicon brush.

[0071] The picture of the leather surface granite prepared in this embodiment is as follows Figure 3 As shown by Figure 3 It can be seen that:

[0072] The leather-surface granite prepared in this embodiment has obvious concave-convex feeling and high gloss; Figure 3 and Figure 1 By comparison, we can see that:

[0073] In this embodiment, all abrasives and air pressure for grinding the litchi surface are reasonably designed according to the Mohs hardness of the granite, so that the litchi surface of the granite has a more obvious concave-convex feeling and improves the anti-slip effect, and the surface is warm and shiny, which ultimately improves the overall texture of the litchi surface of the granite, increases production capacity, stabilizes quality, makes the appearance effect more prominent and obvious, and presents a strong effect.

[0074] Embodiment 2:

[0075] This embodiment takes granite with a Mohs hardness of less than 6 as an example.

[0076] A method for preparing leather-faced granite comprises the following steps:

[0077] S2a, the granite surface of this embodiment is uneven, first use a No. 50 iron plate to grind the granite surface, and then use a No. 60 diamond brush to grind the granite surface; use a No. 60 diamond brush to grind the granite surface, and the air pressure is 0.1Mpa;

[0078] S2b, use No. 3 leather brush, No. 4 leather brush and No. 5 leather brush to polish the granite surface in turn, and the air pressure is 0.04Mpa;

[0079] S2c, sequentially pickling (20% hydrochloric acid), spraying polishing agent, and polishing the granite surface with a No. 6 leather brush; the air pressure is 0.04Mpa.

[0080] Wherein, the polishing agent is composed of the following components by weight:

[0081] 18 parts of abrasive, 4 parts of sodium dodecyl sulfonate, 12 parts of acetic acid, 12 parts of sodium chromate, 25 parts of modified polyacrylate, and 8 parts of water; wherein the abrasive is a mixture of silicon carbide powder and silicon dioxide powder in equal proportions.

[0082] In this embodiment, the usage of leather brush No. 3 is 1.5 times that of diamond brush No. 60; the usage of leather brush No. 4 and leather brush No. 5 is 2 times that of diamond brush No. 60; the usage of leather brush No. 6 and leather brush No. 5 is 3 times that of diamond brush No. 60.

[0083] The effect diagram of the leather surface granite prepared in this embodiment is as follows: Figure 4-Figure 5 As shown by Figure 4-Figure 5 It can be seen that:

[0084] The leather-surface granite prepared in this embodiment has obvious concave-convex feeling and high glossiness.

[0085] Comparative Example 1:

[0086] This embodiment takes granite with a Mohs hardness of less than 6 as an example.

[0087] A method for preparing leather-faced granite comprises the following steps:

[0088] S2a, the granite surface of this embodiment is uneven, first use a No. 50 iron plate to grind the granite surface, and then use a No. 60 diamond brush to grind the granite surface; use a No. 60 diamond brush to grind the granite surface, and the air pressure is 0.1Mpa;

[0089] S2b, use No. 3 leather brush to polish the granite surface, the air pressure is 0.02Mpa;

[0090] S2c. Use a No. 5 leather brush to polish the granite surface; the air pressure is 0.02Mpa.

[0091] The effect picture of the leather surface granite prepared in this comparative example is as follows Figure 6-Figure 7 As shown by Figure 6-Figure 7 It can be seen that:

[0092] The leather-surface granite prepared in this comparative example has no obvious concave-convex feeling and has low glossiness.

[0093] Comparative Example 2:

[0094] This comparative example is based on Example 1, and the difference from Example 1 is that:

[0095] In step S24, the polishing agent is not sprayed.

[0096] Comparative Example 3:

[0097] This comparative example is based on Example 1, and the difference from Example 1 is that:

[0098] The formula of the polishing agent used in step S24 is different, specifically:

[0099] The polishing agent of this comparative example is composed of the following components in parts by weight:

[0100] 18 parts of abrasive, 4 parts of sodium dodecyl sulfonate, 22 parts of acetic acid, 23 parts of sodium chromate, and 8 parts of water.

[0101] Comparative Example 4:

[0102] This comparative example is based on Example 1, and the difference from Example 1 is that:

[0103] The formula of the polishing agent used in step S24 is different, specifically:

[0104] The polishing agent of this comparative example is composed of the following components in parts by weight:

[0105] 18 parts of abrasive, 4 parts of sodium dodecyl sulfonate, 20 parts of acetic acid, 29 parts of modified polyacrylate, and 8 parts of water.

[0106] The leather-surface granites prepared in Example 1, Example 2, and Comparative Examples 1 to 4 were subjected to glossiness test, roughness scoring evaluation, and concave-convexity scoring evaluation; wherein, the glossiness test was tested with reference to GB / T 3295-1996 "Test Method for 45° Mirror Glossiness of Ceramic Products" and combined with the scoring evaluation method. The scoring evaluation criteria are shown in Table 1, and the test results are shown in Table 2, wherein the scoring adopts the average value of the evaluations of 3 people:

[0107] Table 1

[0108] Scoring Criteria 0-6 points (including 6 points) 6-8 points (8 points included) 8-10 points Glossiness Dull and matte Slightly glossy Bright and shiny Concave and convex General bumpy feeling Obvious bumpy feeling Strong bumpy feeling and high finger sliding resistance Roughness There is a noticeable scratching feeling when sliding your fingers No obvious scratching feeling Smooth and scratch-free

[0109] Table 2

[0110]

[0111]

[0112] Combined with Table 2 Figure 1-Figure 7 It can be seen that:

[0113] 1) The leather-surface granite prepared by the present invention has both high concavoconvexity and low roughness, is easy to clean, and has high gloss.

[0114] 2) When the granite is polished with the same parameters and abrasives, if no polishing agent is used, the concave-convex feeling is slightly reduced, and the glossiness and roughness are significantly reduced, indicating that the polishing agent of the present invention can be beneficial to improving the glossiness and smoothness of the prepared leather-faced granite.

[0115] 3) When the polishing agent of the present invention does not contain modified polyacrylate or sodium chromate, the concavoconvex feeling remains unchanged, and the glossiness and roughness are significantly reduced.

[0116] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A preparation process of leather-faced granite, characterized in that: The following steps are involved: S1. Select coarse grinding abrasive, fine grinding abrasive and polishing abrasive according to the Mohs hardness of granite, and design the coarse grinding air pressure, fine grinding air pressure and polishing air pressure; When the Mohs hardness of granite is greater than or equal to 6, the coarse grinding abrasives are No. 36 carbon silicon brush, No. 60 diamond brush and No. 120 diamond brush; the fine grinding abrasives are No. 500 diamond brush and No. 1500 diamond brush; the polishing abrasives are No. 5 polishing brush and No. 6 polishing brush; When the Mohs hardness of granite is less than 6, use No. 60 diamond brush and No. 3 leather brush for coarse grinding; No. 4 leather brush and No. 5 leather brush for fine grinding; No. 6 leather brush for polishing. S2. Coarse grinding, fine grinding and polishing are sequentially performed on the surface of the granite; and before polishing, the finely ground granite surface is pickled and sprayed with a polishing agent in sequence, wherein the polishing agent includes the following components in parts by weight: 15-18 parts of abrasive, 2-5 parts of sodium dodecyl sulfonate, 10-15 parts of acetic acid, 10-12 parts of sodium chromate, 20-30 parts of modified polyacrylate, and 5-10 parts of water; wherein the abrasive is a mixture of silicon carbide powder and silicon dioxide powder.

2. The process for preparing leather-faced granite according to claim 1, characterized in that: The air pressure for coarse grinding of granite with different Mohs hardness is 0.1Mpa; the air pressure for fine grinding and polishing is 0.02-0.06Mpa.

3. The preparation process of leather-faced granite according to claim 1, characterized in that: When the Mohs hardness of granite is greater than or equal to 6, the preparation process of leather-faced granite is: S21. Use a No. 36 carbon silicon brush to polish the granite surface at an air pressure of 0.1Mpa; S22. Use a No. 60 diamond brush to polish the granite surface; the air pressure is 0.02-0.06Mpa; S23. Use No. 120 diamond brush and No. 500 diamond brush to polish the granite surface; the air pressure is 0.02-0.06Mpa; S24, pickling and spraying polishing agent in turn, using No. 1500 diamond brush, No. 5 polishing brush and No. 6 polishing brush to polish the granite surface, the air pressure is 0.02-0.06Mpa.

4. The process for preparing leather-faced granite according to claim 3, characterized in that: The usage of No. 60 diamond brush, No. 120 diamond brush, No. 500 diamond brush, No. 1500 diamond brush and No. 6 polishing brush is twice that of No. 36 carbon silicon brush; the usage of No. 5 polishing brush is 4 times that of No. 36 carbon silicon brush.

5. The process for preparing leather-faced granite according to claim 3, characterized in that: In step S21, if the processed leather surface is a litchi surface, before using a No. 36 carbon silicon brush to polish the granite surface, first use a litchi head to polish the granite surface so that the granite surface forms a litchi surface, and the air pressure is 0.1Mpa.

6. The process for preparing leather-faced granite according to claim 1, characterized in that: When the Mohs hardness of granite is less than 6, the preparation process of leather-faced granite is: S2a, use a No. 60 diamond brush to polish the granite surface with an air pressure of 0.1Mpa; S2b, use No. 3 leather brush, No. 4 leather brush and No. 5 leather brush to polish the granite surface in turn, and the air pressure is 0.02-0.06Mpa; S2c, pickling and spraying polishing agent in turn, and polishing the granite surface with a No. 6 leather brush; the air pressure is 0.02-0.06Mpa.

7. The process for preparing leather-faced granite according to claim 6, characterized in that: The usage of No. 3 leather brush is 1-1.5 times that of No. 60 diamond brush; the usage of No. 4 leather brush and No. 5 leather brush is 2 times that of No. 60 diamond brush; the usage of No. 6 leather brush and No. 5 leather brush is 3 times that of No. 60 diamond brush.

8. The process for preparing leather-faced granite according to claim 6, characterized in that: In step S2a, if the granite surface is uneven, firstly grind the granite surface with a No. 50 iron plate, grind the granite surface flat, and then grind the granite surface with a No. 60 diamond brush.

9. The process for preparing leather-faced granite according to claim 1, characterized in that: In step S2, the preparation process of the modified polyacrylate in the polishing agent is as follows: Methyl methacrylate and butyl acrylate in a mass ratio of 1:1, dodecafluoroheptyl methacrylate, a nonionic surfactant and a crosslinking agent are prepared into a core layer emulsion; methyl methacrylate and butyl acrylate in a mass ratio of 1:3, dodecafluoroheptyl methacrylate, a nonionic surfactant and a crosslinking agent are prepared into a shell layer emulsion; After ultrasonic dispersion of the core layer emulsion, adjust the pH value to 8-10, heat to 80-90°C, and drop potassium persulfate solution; keep warm for 20-30 minutes, then ultrasonic dispersion of the shell layer emulsion and heat to 80-90°C, add it to the core layer emulsion, drop potassium persulfate solution, and keep warm for 60-80 minutes; Cool and filter to obtain modified polyacrylate.

10. Leather-faced granite prepared by the preparation process according to any one of claims 1 to 9.

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