Anti-crack leveling gypsum and processing technology thereof

Abstract

The anti-crack leveling gypsum comprises 25% of desulfurized gypsum, 11% of cement, 5% of graphite, 11% of rubber particles, 11% of cellosilk, 10% of molybdenum disulfide, 12% of a polyvinyl acetate emulsion, 5% of calcium lignosulphonate, 3% of a cementing agent and 7% of a conditioning agent. According to the invention, the multi-stage compounded gypsum particles are utilized, so that cracking is avoided after leveling of thick gypsum batch.

Description

Technical Field

[0001] The invention belongs to the field of building materials, and in particular relates to base treatment materials. Background Art

[0002] Gypsum leveling refers to the rough leveling of the wall surface (mainly applied on the wall surface, but can also be used for other bases that need to be leveled) by plaster scraping during the decoration process. Plaster leveling is generally carried out after the wall surface is painted with interface agent and before puttying. The main reason is that the wall and ceiling have poor flatness, and it is difficult to achieve the leveling requirements by only using putty. Therefore, in the decoration process, the current practice is to use gypsum to roughly level the base layer first, especially for caulking, filling holes, straightening corners, etc. The effect is excellent and is loved by construction parties and users.

[0003] Leveling plaster is mainly gypsum powder. When used on the construction site, the gypsum powder is mixed with water and then applied to the work surface. Gypsum powder is mainly made of high-quality natural semi-hydrated gypsum, lime lime, and heavy calcium, supplemented by a variety of polymer additives and refined according to a scientific formula. It has the characteristics of high bonding strength, no cracking, no hollowing and falling off, no sagging during construction, easy leveling, easy to shape the corners, saving time and labor, and less secondary repairs. It is also a green and environmentally friendly home decoration material and can be used with confidence.

[0004] However, the current leveling gypsum itself is brittle and prone to cracking after long-term use after thick batch construction. At the same time, it releases a lot of VOCs, which is not very friendly to environments where children are used. Summary of the invention

[0005] The present invention aims to provide a leveling plaster processing technology to solve the technical problem of insufficient flexibility of the leveling plaster after construction.

[0006] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows: A leveling gypsum, characterized in that it comprises the following components: desulfurized gypsum, cement, graphite, rubber particles, fiber filaments, molybdenum disulfide, polyvinyl acetate emulsion, calcium lignin sulfonate, a binder and a regulator.

[0007] Furthermore, the desulfurized gypsum, cement, graphite, rubber particles, fiber filaments, molybdenum disulfide, polyvinyl acetate emulsion, calcium lignin sulfonate, binder and regulator; By mass percentage: 25~47%, 7~11%, 3~5%, 5~11%, 8~15%, 8~10%, 8~12%, 3~5%, 2~3%, and 7~9%.

[0008] Furthermore, the particle size of the rubber particles is 0-0.1 mm.

[0009] Furthermore, the fiber filaments are one or more of bamboo charcoal fibers, glass fibers, carbon fibers, cotton fibers, aramid fibers, and polypropylene fibers.

[0010] Furthermore, the conditioning agent includes a mixture of polycarboxylate water reducer, gypsum retarder, water retaining agent, waterproofing agent, leveling agent and Brunei rubber; The water retaining agent is methyl cellulose ether or cellulose ether; The waterproofing agent is a compound of organic silicon powder and sodium stearate.

[0011] A leveling plaster processing process according to any one of claims 1 to 5, characterized in that it comprises the following steps: Step 1: crush the desulfurized gypsum, heat it to 80-90°C, add carbide slag and stir-fry, stir-fry evenly, cool to 40-50°C, add emulsion soybean lecithin dispersant and β-glucan, add water, and stir evenly at a speed of 300-400 r / min; Step 2: Mix the sepiolite powder, polytetrafluoroethylene emulsion and foam particles, stir evenly at 45-60°C for 0.5-1h to obtain modified sepiolite powder, add the fluorosilane coupling agent to the desulfurized gypsum, add water, and stir evenly at a speed of 650-850r / min; Step 3: After heating the flake graphite and molybdenum disulfide to 70-80°C, add them into a homogeneous mixture of fluorine-containing desulfurized gypsum and cement, and stir them evenly at a speed of 650-700 r / min to obtain premix A; Step 4: Dissolve calcium lignin sulfonate in water with a water content of 30-40%, add inorganic vitrified microspheres and stir evenly, add to gypsum, stir evenly at a speed of 400-500 r / min, and finally add cement and stir evenly to obtain premix B; Step 5: After mixing premix A, premix B, rubber particles and binder, slowly add polyvinyl acetate emulsion and regulator, stir evenly at a speed of 200-350 r / min, and finally obtain gypsum mortar.

[0012] Furthermore, in the step 1, the gypsum is crushed by a multi-stage compounding method, and the crushing operation is performed using a multi-stage compounding crushing device, and the multi-stage compounding crushing device distributes the gypsum crushing particle size into three levels.

[0013] Furthermore, the multi-stage compound pulverizing device comprises: a base, a first grading screen, a second grading screen, and a feed hopper, the base is provided with a mounting base and a pair of gantry seats, the gantry seats are connected with a gantry via pins, and the feed hopper is fixedly connected to the gantry; The first grading screen and the second grading screen are stacked together, the first grading screen is fixed on a sieve plate, the sieve plate is connected to a mounting base via a plurality of springs, a driving motor is fixed on the mounting base, a driving disc is connected to the driving motor, and the driving disc is connected to the sieve plate via a driving shaft; The feed hopper is in an hourglass shape, connected to the second grading screen at the top, and provided with a crushing shaft through a top bracket and an internal bracket, the crushing shaft is connected with a first crushing head and a second crushing head, a limiting ring is provided on the crushing shaft, a spring is provided between the limiting ring and the internal bracket, a crushing motor is provided on the internal bracket, and the crushing motor is connected to the crushing shaft; A docking plate is connected to the lower part of the feed hopper through a plurality of springs, the docking plate is connected to the second grading screen, and the docking plate is connected to the feed hopper body through a cloth bag.

[0014] Furthermore, a distribution plate is movably provided inside the first grading screen and the second grading screen, and the distribution plate is rotatably arranged by a rotating shaft, one end of the distribution plate is clamped in the clamping slot, and the other end maintains a gap with the inside of the first grading screen and the second grading screen; The first grading screen and the second grading screen are provided with grading screen plates at the bottom, wherein the grading screen plates in the first grading screen are sealing plates; the grading screen plates are arranged obliquely, with the higher side being located at a position where there is a gap between the material distribution plate and the first grading screen and the second grading screen, and the lower side being connected to the discharge openings on the sides of the first grading screen and the second grading screen; The bottom of the first grading screen is sealed, and the bottom of the second grading screen is provided with a docking port, the outer dimensions of the port are the same as the inner diameter of the second grading screen.

[0015] Furthermore, the driving disk is provided with a track groove, and a plurality of limit slots are distributed on the track groove. The driving shaft is provided with a limit snap ring, and the outer diameter of the limit snap ring is larger than the width of the track groove. The track groove is provided with a clamping head that cooperates with the limit slot.

[0016] The technical solution of the present invention has the following advantages: by adding foam and fiber, the overall flexibility is improved and the weight is reduced.

[0017] After the desulfurized gypsum is processed, its durability is improved. Combined with materials such as graphite, inorganic vitrified microspheres, molybdenum disulfide, polyvinyl acetate emulsion, calcium lignin sulfonate, binders and regulators, the molecular interaction between materials is promoted, the density of the mortar is enhanced, thereby improving the mortar's compression, flexural and impermeability performance, and further improving the mortar's high temperature resistance, corrosion resistance and friction resistance, and comprehensively improving the mortar's mechanical properties and chemical resistance.

[0018] By using multi-stage compounded gypsum particles, it is possible to prevent cracks from occurring after thick leveling gypsum is applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the present invention; Figure 2 A schematic diagram of the structure of the feed hopper of the present invention; Figure 3 A schematic diagram of the structure of the second grading screen of the present invention; Figure 4 It is a schematic structural diagram of the drive disk of the present invention. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] In practical applications, the particle size of rubber particles is 0.05mm, 0.08mm, and 0.1mm.

[0022] In practical applications, the fiber filaments are one or more of bamboo charcoal fibers, glass fibers, carbon fibers, cotton fibers, aramid fibers, and polypropylene fibers.

[0023] In practical applications, the regulator includes a mixture of polycarboxylate water reducer, gypsum retarder, water retaining agent, waterproofing agent, leveling agent and Brunei rubber; In practical applications, the water retaining agent is methyl cellulose ether or cellulose ether; In practical applications, the waterproofing agent is a compound of silicone powder and sodium stearate.

[0024] Example 1 A leveling gypsum comprises: 25% desulfurized gypsum, 11% cement, 5% graphite, 11% rubber particles, 11% fiber filaments, 10% molybdenum disulfide, 12% polyvinyl acetate emulsion, 5% calcium lignin sulfonate, 3% binder and 7% regulator.

[0025] Example 2 A leveling gypsum comprises: 47% desulfurized gypsum, 7% cement, 3% graphite, 5% rubber particles, 8% fiber filaments, 8% molybdenum disulfide, 8% polyvinyl acetate emulsion, 3% calcium lignin sulfonate, 2% binder and 9% regulator.

[0026] Example 3 A leveling gypsum comprises: 35% of desulfurized gypsum, 9% of cement, 5% of graphite, 6% of rubber particles, 14% of fiber filaments, 9% of molybdenum disulfide, 10% of polyvinyl acetate emulsion, 3% of calcium lignin sulfonate, 2% of a binder and 7% of a regulator.

[0027] Example 4 A leveling gypsum processing technology, characterized in that it comprises the following steps: Step 1: crush the desulfurized gypsum, heat it to 80-90°C, add carbide slag and stir-fry, stir-fry evenly, cool to 40-50°C, add emulsion soybean lecithin dispersant and β-glucan, add water, and stir evenly at a speed of 300-400 r / min; Step 2: Mix the sepiolite powder, polytetrafluoroethylene emulsion and foam particles, stir evenly at 45-60°C for 0.5-1h to obtain modified sepiolite powder, add the fluorosilane coupling agent to the desulfurized gypsum, add water, and stir evenly at a speed of 650-850r / min; Step 3: After heating the flake graphite and molybdenum disulfide to 70-80°C, add them into a homogeneous mixture of fluorine-containing desulfurized gypsum and cement, and stir them evenly at a speed of 650-700 r / min to obtain premix A; Step 4: Dissolve calcium lignin sulfonate in water with a water content of 30-40%, add inorganic vitrified microspheres and stir evenly, add to gypsum, stir evenly at a speed of 400-500 r / min, and finally add cement and stir evenly to obtain premix B; Step 5: After mixing premix A, premix B, rubber particles and binder, slowly add polyvinyl acetate emulsion and regulator, stir evenly at a speed of 200-350 r / min, and finally obtain gypsum mortar.

[0028] The technical solution of the present invention has the following advantages: by adding foam and fiber, the overall flexibility is improved and the weight is reduced.

[0029] Example 5 In this embodiment, in step 1, gypsum is crushed by a multi-stage compounding method, and a multi-stage compounding crushing device is used for crushing operation. The gypsum powder particle size is increased and distributed in three levels, and the gypsum crushing particle size is ground according to requirements through the multi-stage compounding crushing device.

[0030] In the specific implementation process, 2 to 4 levels of grading can be carried out as needed, and the gypsum powder particle size is distributed in four intervals: less than 3nm, 3nm to 30nm, 30nm to 65nm, and greater than 65nm.

[0031] like Figure 1~Figure 4As shown, the multi-stage compound pulverizing device comprises: a base 1, a first grading screen 5, a second grading screen 6, and a feed hopper 7. The base 1 is provided with a mounting base 3 and a pair of gantry seats 2. The gantry seats 2 are connected with a gantry 21 through pins, and the feed hopper 7 is fixedly connected to the gantry 21. The first grading screen 5 and the second grading screen 6 are stacked together, the first grading screen 5 is arranged at the bottom, and a plurality of second grading screens 6 are stacked above. Each second grading screen 6 corresponds to a different particle size, which decreases from top to bottom. The number can be adjusted according to the grading requirements, and the fixed height of the gantry 21 on the gantry seat 2 can also be adjusted according to the height.

[0032] The first grading screen 5 is fixed on the sieving plate 4, and the sieving plate 4 is connected to the mounting base 3 through a plurality of springs 8. A driving motor 11 is fixed on the mounting base 3, and a driving disc 12 is connected to the driving motor 11. The driving disc 12 is eccentrically connected to the sieving plate 4 through a driving shaft 15. When the driving shaft 15 rotates, the first grading screen 5 and the second grading screen 6 are driven to shake. The spring 8 not only ensures the connection, but also provides a shaking space and reduces the transmission of vibration.

[0033] When the technology of the present invention is implemented, the feed hopper 7 is hourglass-shaped, and the feed hopper 7 is connected to the second grading screen 6 at the top. The feed hopper 7 is provided with a crushing shaft 75 through a top bracket 76 and an internal bracket 74, and the crushing shaft 75 is connected with a first crushing head 77 and a second crushing head 78. Specifically, the first crushing head 77 and the second crushing head 78 are both conical structures, and the surface is provided with serrated lines. When the first crushing head 77 and the second crushing head 78 are installed, the two ends with smaller sizes are butted, and the installation position is located at the smallest size in the middle of the feed hopper 7, and the gypsum powder can be ground when rotating.

[0034] During the implementation of this technical solution, a limit ring 79 is provided on the crushing shaft 75, a spring is provided between the limit ring 79 and the internal bracket 74, a crushing motor 73 is provided on the internal bracket 74, and the crushing motor 73 is connected to the crushing shaft 75. During the rotation process, this structure can achieve up and down vibration through the spring, which can avoid material jamming on the one hand, and can have the functions of extrusion, impact and crushing while grinding on the other hand.

[0035] During the implementation of the technical solution, a docking plate 71 is connected to the lower part of the feed hopper 7 through a plurality of springs 8, the docking plate 71 is connected to the second grading screen 6 through the docking port 61, and the docking plate 71 is connected to the main body of the feed hopper 7 through a cloth bag 72. The springs 8 reduce the impact of vibration on the gantry 21.

[0036] Specifically, a distribution plate 63 is movably provided inside the first grading screen 5 and the second grading screen 6. The distribution plate 63 is rotatably arranged by a rotating shaft, one end of which is clamped in a clamping groove 64, and the other end of which maintains a gap with the inside of the first grading screen 5 and the second grading screen 6. In this structure, during the shaking process of the first grading screen 5 and the second grading screen 6, the distribution plate 63 also rebounds up and down in the clamping groove 64, thereby preventing the lime powder from accumulating on the distribution plate 63, and guiding the lime powder from the end to the grading screen plate 62, so that the lime powder has a longer screening stroke on the grading screen plate 62.

[0037] In the present technology, a grading screen plate 62 is provided at the bottom of the first grading screen 5 and the second grading screen 6, wherein the grading screen plate 62 in the first grading screen 5 is a sealing plate. The grading screen plate 62 is arranged obliquely, with the higher side located at a position where there is a gap between the material distribution plate 63 and the first grading screen 5 and the second grading screen 6, and the lower side connected to the discharge port 65 on the side of the first grading screen 5 and the second grading screen 6.

[0038] Specifically, the bottom of the first grading screen 5 is sealed, and the bottom of the second grading screen 6 is provided with a docking port 61, and the outer dimensions of the port 61 are the same as the inner diameter of the second grading screen 6. When the number of second grading screens 6 needs to be increased, they can be directly stacked and then locked by screw connection.

[0039] In the present technology, a track groove 13 is provided on the driving disk 12, and a plurality of limit slots 14 are distributed on the track groove 13. A limit snap ring 16 is provided on the driving shaft 15 to ensure that the driving shaft 15 does not slip, and the outer diameter of the limit snap ring 16 is greater than the width of the track groove 13. A clamping head is provided on the track groove 13 to cooperate with the limit slot 14. Through the eccentric position of the driving shaft 15, the vibration amplitude can be adjusted, and it is also convenient to match the number of stacks of different second grading screens 6.

[0040] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A crack-resistant leveling gypsum, characterized in that , including the following components: desulfurized gypsum, cement, graphite, rubber particles, fiber filaments, molybdenum disulfide, polyvinyl acetate emulsion, calcium lignin sulfonate, starch ether and regulator.

2. The leveling plaster according to claim 1, characterized in that , the desulfurized gypsum, cement, graphite, rubber particles, fiber filaments, molybdenum disulfide, polyvinyl acetate emulsion, calcium lignin sulfonate, binder and regulator; By mass percentage: 25~47%, 7~11%, 3~5%, 5~11%, 8~15%, 8~10%, 8~12%, 3~5%, 2~3%, and 7~9%.

3. The anti-cracking leveling gypsum according to claim 2 is characterized in that , the particle size of the rubber particles is 0~0.1mm.

4. The anti-cracking leveling gypsum according to claim 3 is characterized in that The fiber filaments are one or more of bamboo charcoal fiber, glass fiber, carbon fiber, cotton fiber, aramid fiber, and polypropylene fiber.

5. The anti-cracking leveling gypsum according to claim 4 is characterized in that , the conditioning agent includes a mixture of polycarboxylate water reducer, gypsum retarder, water retaining agent, waterproofing agent, leveling agent and Brunei rubber; The water retaining agent is methyl cellulose ether or cellulose ether; The waterproofing agent is a compound of organic silicon powder and sodium stearate.

6. A process for processing the anti-cracking leveling gypsum according to any one of claims 1 to 5, characterized in that , including the following steps: Step 1: crush the desulfurized gypsum, heat it to 80-90°C, add carbide slag and stir-fry, stir-fry evenly, cool to 40-50°C, add emulsion soybean lecithin dispersant and β-glucan, add water, and stir evenly at a speed of 300-400 r / min; Step 2: Mix the sepiolite powder, polytetrafluoroethylene emulsion and foam particles, stir evenly at 45-60°C for 0.5-1h to obtain modified sepiolite powder, add the fluorosilane coupling agent to the desulfurized gypsum, add water, and stir evenly at a speed of 650-850r / min; Step 3: After heating the flake graphite and molybdenum disulfide to 70-80°C, add them into a homogeneous mixture of fluorine-containing desulfurized gypsum and cement, and stir them evenly at a speed of 650-700 r / min to obtain premix A; Step 4: Dissolve calcium lignin sulfonate in water with a water content of 30-40%, add inorganic vitrified microspheres and stir evenly, add to gypsum, stir evenly at a speed of 400-500 r / min, and finally add cement and stir evenly to obtain premix B; Step 5: After mixing premix A, premix B, rubber particles and binder, slowly add polyvinyl acetate emulsion and regulator, stir evenly at a speed of 200-350 r / min, and finally obtain gypsum mortar.

7. The process for processing the anti-cracking leveling gypsum according to claim 6 is characterized in that In the step 1, the gypsum is crushed by a multi-stage compounding method, and the crushing operation is performed by a multi-stage compounding crushing device, and the multi-stage compounding crushing device distributes the gypsum crushing particle size into three levels.

8. The process for processing the anti-cracking leveling gypsum according to claim 7 is characterized in that The multi-stage compound pulverizing device comprises: a base (1), a first grading screen (5), a second grading screen (6), and a feed hopper (7); the base (1) is provided with a mounting base (3) and a pair of gantry seats (2); the gantry seats (2) are connected to a gantry (21) via pins; and the feed hopper (7) is fixedly connected to the gantry (21); The first grading screen (5) and the second grading screen (6) are stacked together; the first grading screen (5) is fixed on a sieve plate (4); the sieve plate (4) is connected to a mounting base (3) via a plurality of springs (8); a drive motor (11) is fixed to the mounting base (3); a drive disc (12) is connected to the drive motor (11); and the drive disc (12) is connected to the sieve plate (4) via a drive shaft (15); The feed hopper (7) is in the shape of an hourglass. The feed hopper (7) is connected to the second grading screen (6) at the top. The feed hopper (7) is provided with a crushing shaft (75) through a top bracket (76) and an internal bracket (74). The crushing shaft (75) is connected to a first crushing head (77) and a second crushing head (78). A limiting ring (79) is provided on the crushing shaft (75). A spring is provided between the limiting ring (79) and the internal bracket (74). A crushing motor (73) is provided on the internal bracket (74). The crushing motor (73) is butt-jointed with the crushing shaft (75). A docking plate (71) is connected below the feed hopper (7) via a plurality of springs (8); the docking plate (71) is connected to the second grading screen (6); and the docking plate (71) and the main body of the feed hopper (7) are connected via a cloth bag (72).

9. The process for processing the anti-cracking leveling gypsum according to claim 8 is characterized in that A material distribution plate (63) is movably provided inside the first grading screen (5) and the second grading screen (6); the material distribution plate (63) is rotatably arranged via a rotating shaft, one end of the material distribution plate is clamped in a clamping groove (64), and the other end maintains a gap with the inside of the first grading screen (5) and the second grading screen (6); A grading screen plate (62) is provided at the bottom of the first grading screen (5) and the second grading screen (6), wherein the grading screen plate (62) in the first grading screen (5) is a sealing plate; the grading screen plate (62) is arranged obliquely, with the higher side being located at a position where there is a gap between the material distribution plate (63) and the first grading screen (5) and the second grading screen (6), and the lower side being connected to a discharge port (65) on the side of the first grading screen (5) and the second grading screen (6); The bottom of the first grading screen (5) is sealed, and the bottom of the second grading screen (6) is provided with a docking port (61), the outer dimensions of the port (61) being the same as the inner diameter of the second grading screen (6).

10. The process for processing the anti-cracking leveling gypsum according to claim 9 is characterized in that The driving disk (12) is provided with a track groove (13), a plurality of limit slots (14) are distributed on the track groove (13), a limit snap ring (16) is provided on the driving shaft (15), the outer diameter of the limit snap ring (16) is greater than the width of the track groove (13), and a clamping head is provided on the track groove (13) to cooperate with the limit slot (14).

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