Preparation method of inorganic coating for wall coating

Abstract

The invention relates to the technical field of inorganic coatings, and discloses a preparation method of an inorganic coating for wall coating, which comprises the following preparation steps: 1) obtaining a modified inorganic filler; 2) adding the modified inorganic filler mixed water body into a stirring barrel to form a filler solution; 3) adding potassium silicate, water-based silane sol, colloidal silicon dioxide, a thickening agent, a dispersing agent and a water-based wetting agent into the filler solution, and stirring and mixing to form a mixed solution; and 4) adjusting the pH value of the mixed solution to 9-12, and stirring and mixing the mixed solution for a set time to form the inorganic coating. Two stirring shafts which are arranged in parallel at an interval are arranged in the stirring barrel, and a plurality of stirring blades are arranged on the stirring shafts; the periphery of the stirring shaft is sleeved with a sleeve which reciprocates up and down along the stirring shaft, the end of the sleeve is connected with a spring, and a limiting structure for limiting the sleeve to rotate circumferentially relative to the stirring shaft is arranged between the sleeve and the stirring shaft; stirring and mixing are more uniform, and the performance of the inorganic coating is greatly improved.

Description

Technical Field

[0001] The invention patent relates to the technical field of inorganic coatings, specifically, to a method for preparing inorganic coatings for wall painting. Background Art

[0002] As society's requirements for environmental protection, health and sustainable development are increasing, the choice of building decoration materials is also undergoing a profound change. Inorganic coatings, as a new type of green and environmentally friendly building materials, are gradually gaining attention and favor from the market.

[0003] There are significant differences between inorganic paint and traditional latex paint in terms of performance characteristics, environmental impact, and long-term use effects. Since the 20th century, latex paint has dominated the wall painting of buildings due to its advantages such as easy construction, quick drying, rich colors, and good water resistance.

[0004] At present, latex paint is mainly composed of synthetic resins, pigments, solvents and other additives. Volatile organic compounds (VOCs) may be released during its production process. In addition, it is difficult to handle after the end of its service life, which has potential impacts on the environment.

[0005] Inorganic coatings are derived from natural mineral resources, with silicates as the main film-forming substances, combined with inorganic minerals and other additives. Inorganic coatings not only have excellent weather resistance, acid and alkali resistance, fire retardancy, antibacterial and mildew resistance, but also do not contain volatile organic compounds, which is in line with today's green building and zero pollution environmental protection concepts.

[0006] In addition, the unique chemical bonding method of inorganic coatings allows them to penetrate and integrate with the substrate, improving the durability of the coating and the air permeability of the wall, thereby extending the service life of the coating and reducing maintenance costs. At present, inorganic coatings are widely used in the fields of building walls, bridges and roads, and steel structure anti-corrosion.

[0007] In the prior art, various raw materials need to be stirred and mixed during the preparation of inorganic coatings. However, due to the phenomenon of rotation during the stirring and mixing, the stirring and mixing of the raw materials is uneven, which greatly reduces the performance of the prepared inorganic coating. Summary of the invention

[0008] The purpose of the present invention is to provide a method for preparing an inorganic coating for wall painting, aiming to solve the problem of uneven stirring and mixing in the preparation process of the inorganic coating in the prior art.

[0009] The present invention is achieved by a method for preparing an inorganic coating for wall coating, comprising the following preparation steps:

[0010] 1) Compounding kaolin and calcium carbonate to obtain composite powder, and modifying the composite powder to obtain a modified inorganic filler;

[0011] 2) Add the modified inorganic filler mixed with water into a mixing drum, and stir the modified inorganic filler in the water until it is dispersed to form a filler solution;

[0012] 3) adding potassium silicate, aqueous silane sol, colloidal silicon dioxide, a thickener, a dispersant and an aqueous wetting agent to the filler solution, and stirring and mixing to form a mixed solution;

[0013] 4) After adjusting the pH value of the mixed solution to 9-12, the mixed solution is stirred for a set time to form the inorganic coating;

[0014] The mixing drum is provided with two stirring shafts arranged in parallel at intervals, and the stirring shafts are provided with a plurality of stirring blades, the plurality of stirring blades are arranged at intervals along the circumference and axial direction of the stirring shafts, and the stirring blades on adjacent stirring shafts are arranged in an up-and-down staggered manner;

[0015] The outer periphery of the stirring shaft is sleeved with a sleeve that reciprocates up and down along the stirring shaft, a plurality of stirring blades are arranged on the outer periphery of the sleeve, the ends of the sleeve are respectively connected to springs, one end of the spring is movably abutted against the end of the sleeve, and the other end of the spring is fixedly connected to the stirring shaft, and a limiting structure is provided between the sleeve and the stirring shaft to limit the sleeve from rotating in a circle relative to the stirring shaft;

[0016] The two stirring shafts rotate in opposite directions, driving the stirring blades on the two sleeves to rotate in opposite directions. In the process that the sleeves rotate with the stirring shafts, the sleeves reciprocate along the axial direction of the stirring shafts.

[0017] Furthermore, in the preparation step 3), the thickener is hydroxyethyl cellulose.

[0018] Furthermore, in the preparation step 1), the preparation steps of the modified inorganic filler are as follows:

[0019] 1.1) Add the composite powder and water into a mixing drum;

[0020] 1.2) Adding 3-glycidyloxypropyltriethoxysilane surface treatment agent into the mixing drum, heating the mixing drum to 60°C to 80°C, and then driving a plurality of stirring blades to stir for a set time to form a dispersed mixture;

[0021] 1.3), placing the mixed material in a filter to filter out water to form a filter material, and placing the filter material in a dryer for drying;

[0022] 1.4) Place the dried filtered material in a grinder for grinding to form a grind;

[0023] 1.5) placing the ground material in a sifter for sieving to form the modified inorganic filler.

[0024] Furthermore, the sleeve and the stirring shaft are arranged eccentrically, and in the preparation steps 2), 3), and 4), the stirring shaft drives the sleeve to rotate eccentrically synchronously, so that the multiple stirring blades on the sleeve rotate eccentrically synchronously.

[0025] Further, the sleeve has a through hole that is arranged vertically, the stirring shaft passes through the through hole, the limiting structure includes a plurality of rails formed on the outer periphery of the stirring shaft and a plurality of rail grooves formed on the inner side wall of the sleeve, the rails are arranged along the axial direction of the stirring shaft, and the plurality of rails are arranged at intervals along the circumferential direction of the stirring shaft, the rail grooves are arranged along the axial direction of the sleeve and pass through the end of the sleeve, and the plurality of rail grooves are arranged at intervals along the circumferential direction of the sleeve;

[0026] The multiple rails are correspondingly and movably embedded in the multiple rail grooves. When the stirring shaft drives the sleeve to rotate, the multiple stirring blades on the sleeve are subjected to uneven force, driving the sleeve to move back and forth up and down along the stirring shaft, and the rail grooves move back and forth up and down relative to the rails.

[0027] Further, the filter comprises a flexible filter bag, wherein the filter bag has a filter cavity with a top opening, the top of the filter bag has a top edge arranged in a surrounding shape, and the middle of the bottom of the filter bag forms a bottom area; the top edge is fixedly connected to the vibration ring, and the top opening of the filter cavity is arranged upward; a lifter that reciprocates up and down is provided below the filter bag;

[0028] In the preparation step 1.3), during the process of injecting the mixed material into the filter cavity through the top opening for filtration, the lifter lifts the bottom area and moves it vertically up and down to keep the filter bag in an active state.

[0029] Furthermore, the vibration ring is arranged horizontally, and a driver is connected to the vibration ring, and the driver drives the vibration ring to vibrate longitudinally; in the preparation step 1.3), during the process of injecting the mixture into the filter chamber through the top opening for filtration, the driver drives the vibration ring to vibrate longitudinally, and the lifter lifts the bottom area to move longitudinally up and down, and the moving direction of the vibration ring is different from the moving direction of the lifter.

[0030] Furthermore, a lifting end surface is formed on the top of the lifting device, and the lifting end surface is arranged in a spherical shape.

[0031] Furthermore, a plurality of elastic sheets are connected to the outer periphery of the lifting end surface, the inner ends of the elastic sheets are butted against the outer periphery of the lifting end surface, the outer ends of the elastic sheets are arranged away from the lifting end surface and extend outward, and the plurality of elastic sheets are arranged around the lifting end surface at intervals along the circumference;

[0032] Along the direction from the inside to the outside of the elastic sheet, the elastic sheet is arranged to be arched upward, and the top of the elastic sheet is arranged lower than the top of the lifting end surface; in the preparation step 1.3), during the longitudinal reciprocating movement of the lifting end surface against the bottom area, the elastic sheet is elastically deformed reciprocatingly under the pressure of the filter bag.

[0033] Furthermore, in the preparation step 1.5), the sifter comprises two metal sieves arranged at an interval up and down, a sifting interval is provided between the two sieves, a plurality of balls are provided in the sifting interval, and the balls abut against the two sieves respectively;

[0034] After the abrasive is poured onto the screen, the two screens move back and forth in different directions. After the abrasive is screened for the first time by the screen, it falls into the screening interval. Driven by the two screens, the balls in the screening interval roll in the screening interval, squeezing and driving the abrasive in the screening interval to pass through the screen downward.

[0035] Compared with the prior art, the method for preparing inorganic coatings for wall painting provided by the present invention arranges two parallel stirring shafts in a stirring drum, and the two stirring shafts rotate in opposite directions. When the two stirring shafts rotate and mix, the raw materials in the stirring drum can be prevented from rotating, so that the stirring and mixing of various raw materials are more uniform; secondly, during the rotation of the stirring shaft, the stirring blades are subjected to uneven force, so that the entire sleeve moves back and forth up and down relative to the stirring shaft. While the stirring blades rotate and stir, their stirring range changes back and forth, and the raw materials being stirred can be disturbed longitudinally, so that the stirring and mixing are more uniform, greatly improving the performance of the inorganic coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic flow chart of a method for preparing an inorganic coating for wall coating provided by the present invention;

[0037] Figure 2 It is a schematic diagram of the interior of the mixing drum provided by the present invention;

[0038] Figure 3 It is a cross-sectional schematic diagram of the cooperation between the stirring shaft and the sleeve provided by the present invention;

[0039] Figure 4 It is a front view schematic diagram of the cooperation between the filter bag and the jacking device provided by the present invention;

[0040] Figure 5 It is a front view schematic diagram of the sifter provided by the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0043] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0044] Reference Figure 1-5 The figure shows a preferred embodiment of the present invention.

[0045] The method for preparing an inorganic coating for wall coating comprises the following preparation steps:

[0046] 1) Compounding kaolin and calcium carbonate to obtain composite powder, and modifying the composite powder to obtain a modified inorganic filler;

[0047] 2) Adding the modified inorganic filler mixed with water into the mixing drum 100, stirring the modified inorganic filler in the water until it is dispersed to form a filler solution;

[0048] 3) Add potassium silicate, aqueous silane sol, colloidal silicon dioxide, thickener, dispersant and aqueous wetting agent to the filler solution, and stir and mix to form a mixed solution;

[0049] 4) After adjusting the pH value of the mixed solution to 9-12, the mixed solution is stirred for a set time to form an inorganic coating;

[0050] Two stirring shafts 200 are arranged in parallel at intervals in the stirring drum 100 . A plurality of stirring blades 201 are arranged on the stirring shafts 200 . The plurality of stirring blades 201 are arranged at intervals along the circumference and axial direction of the stirring shafts 200 . The stirring blades 201 on adjacent stirring shafts 200 are arranged in an up-and-down staggered manner.

[0051] The outer periphery of the stirring shaft 200 is provided with a sleeve 203 which reciprocates up and down along the stirring shaft 200, and a plurality of stirring blades 201 are arranged on the outer periphery of the sleeve 203. The ends of the sleeve 203 are respectively connected to springs 202. One end of the spring 202 is movably abutted against the end of the sleeve 203, and the other end of the spring 202 is fixedly connected to the stirring shaft 200. A limiting structure is provided between the sleeve 203 and the stirring shaft 200 for limiting the circular rotation of the sleeve 203 relative to the stirring shaft 200.

[0052] The two stirring shafts 200 rotate in different directions, driving the stirring blades 201 on the two sleeves 203 to rotate in different directions. In the process of the sleeves 203 rotating with the stirring shafts 200 , the sleeves 203 reciprocate along the axial direction of the stirring shafts 200 .

[0053] The above-mentioned method for preparing inorganic coatings for wall painting arranges two parallel stirring shafts 200 in the stirring drum 100, and the two stirring shafts 200 rotate in opposite directions. When the two stirring shafts 200 rotate and mix, the raw materials in the stirring drum 100 can be prevented from rotating, so that the stirring and mixing of various raw materials are more uniform; secondly, during the rotation of the stirring shaft 200, the stirring blades 201 are subjected to uneven force, so that the entire sleeve 203 moves back and forth relative to the stirring shaft 200. While the stirring blades 201 rotate and stir, their stirring range changes back and forth, and the raw materials being stirred can be disturbed longitudinally, so that the stirring and mixing are more uniform, greatly improving the performance of the inorganic coating.

[0054] In this embodiment, in the preparation step 3), the thickener is hydroxyethyl cellulose. The aqueous silane sol can be one of the coupling agents HYDROSIL1151 and HYDROSIL2776 of Evonik Degussa of Germany or a mixture of the two, the aqueous dispersant can be the dispersant SN 5027 of Nopco of Japan, and the aqueous wetting agent can be the aqueous coating wetting agent Hydropalat 875 of BASF.

[0055] By weight, potassium silicate 5-20 parts, aqueous silane sol 3-10 parts, colloidal silicon dioxide 10-25 parts, modified inorganic filler 40-60 parts, thickener 1-3 parts, dispersant 0-2 parts, aqueous wetting agent 0.5-1.2 parts, water 150-200 parts. Other colors of pigments can also be added according to requirements to prepare inorganic coatings of different colors.

[0056] In this embodiment, in the preparation step 1), the preparation steps of the modified inorganic filler are as follows:

[0057] 1.1) Add the composite powder and water into the mixing drum 100;

[0058] 1.2) Add 3-glycidyloxypropyltriethoxysilane surface treatment agent into the mixing drum 100, heat the mixing drum 100 to 60°C to 80°C, and drive the stirring shaft 200 to drive the plurality of stirring blades 201 to stir for a set time to form a dispersed mixture;

[0059] 1.3) Place the mixture in a filter to filter out water to form filter material, and place the filter material in a dryer for drying;

[0060] 1.4) Place the dried filtered material in a grinder for grinding to form a grind;

[0061] 1.5) Place the ground material in a sifter for sieving to form a modified inorganic filler.

[0062] The process of compounding kaolin and calcium carbonate is as follows: kaolin dispersion and calcium carbonate dispersion are mixed, ultrasonically treated and dried, and then solid ground and sieved to obtain composite powder.

[0063] 3 Glycidyloxypropyltriethoxysilane is the result of a large number of experimental optimization. It can not only significantly improve the water resistance of coatings, enhance the adhesion and bonding strength of inorganic coatings on the wall, but also the modified inorganic fillers after modification are stable in storage and will not turn yellow or discolor even after long-term storage.

[0064] In addition, the surface of the modified inorganic filler modified with 3-glycidyloxypropyltriethoxysilane also has epoxy groups, which will react with the amino groups of the preferred aqueous silane sol during the preparation process, thereby further improving the dispersibility and compatibility of the inorganic particles in the system, improving the brittleness of the interior wall inorganic architectural coatings, and improving the bonding strength and water resistance of the interior wall coatings.

[0065] In this embodiment, the sleeve 203 and the stirring shaft 200 are eccentrically arranged. In the preparation steps 2), 3), and 4), the stirring shaft 200 drives the sleeve 203 to rotate eccentrically synchronously, so that the multiple stirring blades 201 on the sleeve 203 rotate eccentrically synchronously. In this way, the stirring blades 201 can achieve reciprocating changes in the stirring range during the rotation and stirring process, thereby improving the stirring efficiency.

[0066] In this embodiment, the sleeve 203 has a through hole that is arranged vertically, and the stirring shaft 200 passes through the through hole. The limiting structure includes a plurality of rails formed on the outer periphery of the stirring shaft 200 and a plurality of rail grooves formed on the inner wall of the sleeve 203. The rails are arranged to extend along the axial direction of the stirring shaft 200, and the plurality of rails are arranged at intervals along the circumference of the stirring shaft 200. The rail grooves are arranged to extend along the axial direction of the sleeve 203 and pass through the end of the sleeve 203. The plurality of rail grooves are arranged at intervals along the circumference of the sleeve 203.

[0067] Multiple rails are correspondingly and movably embedded in multiple rail grooves. When the stirring shaft 200 drives the sleeve 203 to rotate, the multiple stirring blades 201 on the sleeve 203 are subjected to uneven force, driving the sleeve 203 to move back and forth up and down along the stirring shaft 200, and the rail grooves move back and forth up and down relative to the rails.

[0068] The rail is embedded in the rail groove, so that the circumferential relative movement of the sleeve 203 relative to the stirring shaft 200 can be limited, but the axial movement of the sleeve 203 relative to the stirring shaft 200 will not be limited, and the cooperation between the rail and the rail groove can guide the axial movement between the sleeve 203 and the stirring shaft 200.

[0069] In this embodiment, the filter includes a flexible filter bag 300, wherein the filter bag 300 has a filter cavity 302 with a top opening, the top of the filter bag 300 has a top edge arranged in a surrounding shape, and the middle of the bottom of the filter bag 300 forms a bottom area 305; the top edge is fixedly connected to the vibration ring 301, and the top opening of the filter cavity 302 is arranged upward; a lifter 400 that reciprocates up and down is provided below the filter bag 300;

[0070] In the preparation step 1.3), during the process of injecting the mixed material into the filter cavity 302 through the top opening for filtering, the lifter 400 lifts the bottom area 305 and moves it vertically up and down to make the filter bag 300 active.

[0071] The longitudinal reciprocating movement of the lifter 400 can drive the bottom area 305 to move longitudinally, so that the mixture placed in the filter bag 300 is in a vibrating state, so that the water in the mixture can be better filtered out through the filter bag 300, and the filtering effect is better.

[0072] In this embodiment, the vibration ring 301 is arranged horizontally, and a driver is connected to the vibration ring 301, and the driver drives the vibration ring 301 to vibrate longitudinally; in the preparation step 1.3), during the process of injecting the mixture into the filter chamber 302 through the top opening for filtration, the driver drives the vibration ring 301 to vibrate longitudinally, and the lifter 400 lifts the bottom area 305 to move vertically up and down, and the moving direction of the vibration ring 301 is different from the moving direction of the lifter 400.

[0073] The vibration ring 301 moves back and forth longitudinally, and the lifter 400 moves back and forth longitudinally in different directions, thereby realizing the vibration of the top and bottom of the filter bag 300, driving the entire filter bag 300 to vibrate as a whole, and the mixture in the filter bag 300 is in a tumbling state, so as to achieve more efficient filtration of water in the mixture.

[0074] In this embodiment, a lifting end surface 401 is formed on the top of the lifter 400, and the lifting end surface 401 is arranged in a spherical shape. In this way, a better lifting effect can be achieved and a larger lifting area contact can be achieved.

[0075] In this embodiment, a plurality of elastic sheets 402 are connected to the periphery of the lifting end surface 401, the inner ends of the elastic sheets 402 are butt-jointed to the periphery of the lifting end surface 401, the outer ends of the elastic sheets 402 extend outward away from the lifting end surface 401, and the plurality of elastic sheets 402 are arranged at intervals along the circumference of the lifting end surface 401.

[0076] Along the direction from the inside to the outside of the elastic sheet 402, the elastic sheet 402 is curved upward, and the top of the elastic sheet 402 is arranged lower than the top of the lifting end surface 401; in the preparation step 1.3), when the lifting end surface 401 abuts against the bottom area 305 and moves back and forth longitudinally, the elastic sheet 402 is elastically deformed reciprocatingly under the pressure of the filter bag 300.

[0077] By arranging a plurality of elastic sheets 402, during the longitudinal movement of the lifter 400, the plurality of elastic sheets 402 synchronously elastically stir the bottom of the filter bag 300, thereby stirring the filter bag 300 in a wider range without hindering the filtration of water in the mixture.

[0078] In this embodiment, in the preparation step 1.5), the screener includes two screens 500 spaced apart from each other and made of metal, a screening gap 501 is provided between the two screens 500, a plurality of balls 502 are provided in the screening gap 501, and the balls 502 respectively abut against the two screens 500.

[0079] After the abrasive is poured onto the screen 500, the two screens 500 move back and forth in different directions. After the abrasive is screened for the first time by the screen 500, it falls into the screening gap 501. Driven by the two screens 500, the balls 502 in the screening gap 501 roll in the screening gap 501, squeezing and driving the abrasive in the screening gap 501 to pass through the screen 500 downward.

[0080] By arranging two screens 500, during the screening of the abrasive, the abrasive placed in the screening interval 501 can be laterally squeezed, etc., to achieve further grinding and squeezing of the abrasive, so as to screen the abrasive more efficiently.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an inorganic coating for wall painting, characterized in that: The method comprises the following preparation steps: 1) Compounding kaolin and calcium carbonate to obtain composite powder, and modifying the composite powder to obtain a modified inorganic filler; 2) Add the modified inorganic filler mixed with water into a mixing drum, and stir the modified inorganic filler in the water until it is dispersed to form a filler solution; 3) adding potassium silicate, aqueous silane sol, colloidal silicon dioxide, a thickener, a dispersant and an aqueous wetting agent to the filler solution, and stirring and mixing to form a mixed solution; 4) After adjusting the pH value of the mixed solution to 9-12, the mixed solution is stirred for a set time to form the inorganic coating; The mixing drum is provided with two stirring shafts arranged in parallel at intervals, and the stirring shafts are provided with a plurality of stirring blades, the plurality of stirring blades are arranged at intervals along the circumference and axial direction of the stirring shafts, and the stirring blades on adjacent stirring shafts are arranged in an up-and-down staggered manner; The outer periphery of the stirring shaft is sleeved with a sleeve that reciprocates up and down along the stirring shaft, a plurality of stirring blades are arranged on the outer periphery of the sleeve, the ends of the sleeve are respectively connected to springs, one end of the spring is movably abutted against the end of the sleeve, and the other end of the spring is fixedly connected to the stirring shaft, and a limiting structure is provided between the sleeve and the stirring shaft to limit the sleeve from rotating in a circle relative to the stirring shaft; The two stirring shafts rotate in opposite directions, driving the stirring blades on the two sleeves to rotate in opposite directions. In the process that the sleeves rotate with the stirring shafts, the sleeves reciprocate along the axial direction of the stirring shafts.

2. The method for preparing an inorganic coating for wall painting according to claim 1, characterized in that: In the preparation step 3), the thickener is hydroxyethyl cellulose.

3. The method for preparing an inorganic coating for wall painting according to claim 1 or 2, characterized in that: In the preparation step 1), the preparation steps of the modified inorganic filler are as follows: 1.1) Add the composite powder and water into a mixing drum; 1.2) Adding 3-glycidyloxypropyltriethoxysilane surface treatment agent into the mixing drum, heating the mixing drum to 60°C to 80°C, and then driving a plurality of stirring blades to stir for a set time to form a dispersed mixture; 1.3), placing the mixed material in a filter to filter out water to form a filter material, and placing the filter material in a dryer for drying; 1.4) Place the dried filtered material in a grinder for grinding to form a grind; 1.5) placing the ground material in a sifter for sieving to form the modified inorganic filler.

4. The method for preparing an inorganic coating for wall painting according to claim 4, characterized in that: The sleeve and the stirring shaft are arranged eccentrically. In the preparation steps 2), 3) and 4), the stirring shaft drives the sleeve to rotate eccentrically synchronously, so that the multiple stirring blades on the sleeve rotate eccentrically synchronously.

5. The method for preparing an inorganic coating for wall painting according to claim 4, characterized in that: The sleeve has a through hole that is arranged vertically and vertically, the agitator shaft passes through the through hole, the limiting structure includes a plurality of rails formed on the outer periphery of the agitator shaft and a plurality of rail grooves formed on the inner side wall of the sleeve, the rails are arranged along the axial direction of the agitator shaft, and the plurality of rails are arranged at intervals along the circumference of the agitator shaft, the rail grooves are arranged along the axial direction of the sleeve and pass through the end of the sleeve, and the plurality of rail grooves are arranged at intervals along the circumference of the sleeve; The multiple rails are correspondingly and movably embedded in the multiple rail grooves. When the stirring shaft drives the sleeve to rotate, the multiple stirring blades on the sleeve are subjected to uneven force, driving the sleeve to move back and forth up and down along the stirring shaft, and the rail grooves move back and forth up and down relative to the rails.

6. The method for preparing an inorganic coating for wall painting according to claim 1, characterized in that: The filter comprises a flexible filter bag, wherein the filter bag has a filter cavity with a top opening, the top of the filter bag has a top edge arranged in a surrounding shape, and the middle of the bottom of the filter bag forms a bottom area; the top edge is fixedly connected to the vibration ring, and the top opening of the filter cavity is arranged upward; a lifter that reciprocates up and down is provided below the filter bag; In the preparation step 1.3), during the process of injecting the mixed material into the filter cavity through the top opening for filtration, the lifter lifts the bottom area and moves it vertically up and down to keep the filter bag in an active state.

7. The method for preparing an inorganic coating for wall painting according to claim 3, characterized in that: The vibration ring is arranged horizontally, and a driver is connected to the vibration ring, and the driver drives the vibration ring to vibrate longitudinally; in the preparation step 1.3), during the process of injecting the mixture into the filter chamber through the top opening for filtration, the driver drives the vibration ring to vibrate longitudinally, and the lifter lifts the bottom area to move longitudinally up and down, and the moving direction of the vibration ring is different from the moving direction of the lifter.

8. The method for preparing an inorganic coating for wall painting according to claim 7, characterized in that: A lifting end surface is formed on the top of the lifter, and the lifting end surface is arranged in a spherical shape.

9. The method for preparing an inorganic coating for wall painting according to claim 8, characterized in that: The outer periphery of the lifting end surface is connected with a plurality of elastic sheets, the inner ends of the elastic sheets are butted against the outer periphery of the lifting end surface, the outer ends of the elastic sheets are arranged away from the lifting end surface and extend outward, and the plurality of elastic sheets are arranged around the lifting end surface at intervals along the circumference; Along the direction from the inside to the outside of the elastic sheet, the elastic sheet is arranged to be arched upward, and the top of the elastic sheet is arranged lower than the top of the lifting end surface; in the preparation step 1.3), during the longitudinal reciprocating movement of the lifting end surface against the bottom area, the elastic sheet is elastically deformed reciprocatingly under the pressure of the filter bag.

10. The method for preparing an inorganic coating for wall painting according to claim 3, characterized in that: In the preparation step 1.5), the sifter comprises two metal sieves arranged at an interval up and down, a sifting interval is provided between the two sieves, a plurality of balls are provided in the sifting interval, and the balls abut against the two sieves respectively; After the abrasive is poured onto the screen, the two screens move back and forth in different directions. After the abrasive is screened for the first time by the screen, it falls into the screening interval. Driven by the two screens, the balls in the screening interval roll in the screening interval, squeezing and driving the abrasive in the screening interval to pass through the screen downward.

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