Plastering-free wall leveling construction method

Abstract

The invention provides a plastering-free wall leveling construction method which comprises the following steps: firstly scraping a thick putty layer on the surface of a to-be-leveled base body, and then scraping a leveling putty layer after the thick putty layer is completely dried, so that the leveling construction can be completed. Wherein the thick putty layer is specifically prepared from the following components in parts by weight: 70 to 85 parts of calcium carbonate, 10 to 15 parts of lime, 15 to 30 parts of lightweight aggregate, 3.5 to 4.5 parts of a water-retaining agent, 0.2 to 0.8 part of a thickening agent and 1.0 to 2.0 parts of an early strength agent; the putty leveling layer is specifically prepared from the following components in parts by weight: 75 to 85 parts of calcium carbonate, 10 to 15 parts of lime, 3.5 to 4.5 parts of a water-retaining agent, 0.2 to 0.8 part of a thickening agent and 1.0 to 2.0 parts of an early strength agent. Compared with a traditional construction method of plastering, leveling and adding putty twice, the leveling construction method has the advantages that the construction process is shortened, the decoration cost is reduced, the used raw materials are low in cost, the production energy consumption is low, and the leveling construction method is green and environmentally friendly. The obtained composite plastering-free leveling material has excellent binding power, and can be well attached to various base surfaces, including smooth base layers with high water absorption, such as cast-in-place concrete, aerated concrete and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials and construction techniques, and in particular relates to a plaster-free wall leveling construction method and a material and a preparation method thereof. Background Art

[0002] The current wall system decoration process, such as Figure 1 As shown, it usually includes the following steps: Step 1: Ensure that the wall base is flat, dry and free of cracks; Step 2: Use plaster to level the entire wall; Step 3: Use two coats of putty to fill and level the wall again to provide a smooth base surface for the coating; Step 4: Apply primer to the leveled base surface to improve the adhesion of the coating; Step 5: Apply topcoat on the primer surface and complete finishing touches such as wallpaper, tiles, etc. to achieve the desired decoration effect.

[0003] However, in the second and third steps above, the cost of plaster gypsum raw materials is relatively high, especially when used as an overall leveling material, the amount used is large, resulting in a high cost of decoration materials. Moreover, two layers of putty will be applied again in the subsequent steps, which will further increase the leveling cost. On the other hand, the leveling method of gypsum leveling plus two coats of putty requires a longer construction period. After gypsum leveling, it takes a long time to dry and firm, and each time the putty is applied, it is necessary to wait for it to dry thoroughly before proceeding to the next step. These cumbersome steps will extend the time of the entire decoration project.

[0004] Therefore, it is necessary to develop a composite plaster-free putty wall leveling construction method and its materials and preparation method that can shorten the construction period and reduce the renovation cost. Summary of the invention

[0005] The object of the present invention is to provide a plaster-free wall leveling construction method. By adopting the construction method provided by the present invention, only two layers of materials, a thick putty layer and a putty leveling layer, are used for leveling construction, which effectively shortens the leveling construction process. In addition, the leveling layer after construction is flat and has strong adhesion, and can be well attached to various base surfaces, which is convenient for the subsequent wall decoration process.

[0006] On the other hand, the leveling material used in the present invention is mainly made of calcium carbonate, lime and lightweight aggregate, without the need to add raw materials such as gypsum or cement, which greatly reduces the material cost and avoids the use of high-energy consumption materials such as cement, making the leveling material low-cost and the production process green and environmentally friendly, taking into account both economic and social benefits.

[0007] To achieve the above-mentioned purpose, the present invention provides a plaster-free wall leveling construction method, comprising the following steps: firstly applying a thick putty layer on the surface of a substrate to be leveled, and then applying a leveling putty layer after the thick putty layer is completely dried, thereby completing the leveling construction; wherein the volume ratio of the thick putty layer to the putty leveling layer is 1:(0.2-0.5).

[0008] In a preferred embodiment, the thick putty layer comprises the following components by weight: 70-85 parts of calcium carbonate, 10-15 parts of lime, 15-30 parts of lightweight aggregate, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

[0009] In a preferred embodiment, the putty leveling layer comprises the following components by weight: 75-85 parts of calcium carbonate, 10-15 parts of lime, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

[0010] In a preferred embodiment, the calcium carbonate is heavy calcium carbonate.

[0011] In a preferred embodiment, the lime is lime powder.

[0012] In a preferred embodiment, the lightweight aggregate includes expanded perlite and / or vitrified microspheres.

[0013] In a preferred embodiment, the water retaining agent includes one or more of carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose.

[0014] In a preferred embodiment, the thickener includes one or more of polyacrylate, polyurethane, etherified starch ether, and stearic acid.

[0015] In a preferred embodiment, the early strength agent includes one or more of triethanolamine, calcium formate, and polyvinyl alcohol.

[0016] In a preferred embodiment, the thick putty layer is prepared by the following method: weigh the raw materials used for the thick putty layer by weight, mix them evenly to obtain powder 1, add water to the powder 1 and stir evenly to obtain; preferably, when preparing the thick putty layer, the mass ratio of powder 1 to water is 1:(0.5-0.6).

[0017] In a preferred embodiment, the leveling putty layer is prepared by the following method: weigh the raw materials used for the leveling putty layer by weight, mix them evenly to obtain powder 2, add water to the powder 2 and stir evenly; preferably, when preparing the leveling putty layer, the mass ratio of powder 2 to water is 1:(0.4-0.5).

[0018] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0019] Compared with the construction method of plastering and leveling with two coats of putty in the prior art, the present invention only uses two layers of thick putty layer and putty leveling layer for leveling construction, which not only shortens the construction process but also reduces the decoration cost. Specifically, in the present invention, the designed thick putty leveling technology significantly improves the efficiency and quality of wall surface treatment. The thick putty can effectively cover the unevenness and defects of the base layer, realize one-time molding, thereby eliminating the cumbersome plastering and leveling steps. This not only reduces the material and labor costs, simplifies the construction process, but also shortens the construction period and improves the construction efficiency. In addition, the application of thick putty also improves the overall aesthetics and durability of the wall surface, laying a solid foundation for subsequent decoration work. The light aggregate support used to form a thick putty layer does not require high-cost and high-energy consumption raw materials such as gypsum or cement, which effectively reduces the cost of raw materials. In the present invention, the designed putty leveling layer can make the wall surface smooth and delicate, and level and protect the thick putty layer, further improving the leveling effect. Finally, by optimizing the formula design and construction steps, the thick putty layer and the putty leveling layer are closely combined to form a composite material. This not only saves the plastering and leveling process, but also makes the composite material have strong adhesion and can be well attached to various base surfaces, including smooth and high water absorption bases such as cast-in-place concrete, aerated concrete, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] These and / or other aspects and advantages of the present invention will become more clear and easier to understand from the following detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, in which:

[0021] Figure 1 This is a schematic diagram of the existing wall system decoration process, in which the putty layer is applied twice;

[0022] Figure 2 The wall photos before the wall leveling construction in Example 1 of the present invention, the photos after the thick putty layer is scraped, and the photos after the putty leveling layer is scraped;

[0023] Figure 3 These are photos of the wall before the wall leveling construction in Comparative Example 1 of the present invention, photos after scraping the leveling gypsum layer, photos after scraping the first coat of putty, and photos after scraping the second coat of putty. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods, but it should be understood that the protection scope of the present invention is not limited to the specific implementation methods.

[0025] The embodiment of the present invention solves the problems of complicated process, high cost of leveling materials or high energy consumption in the wall leveling process in the prior art by providing a plaster-free wall leveling construction method.

[0026] The technical solution in the present invention is to solve the above problems, and the overall idea is as follows:

[0027] The invention provides a plaster-free wall leveling construction method, comprising the following steps: firstly applying a thick putty layer on the surface of a substrate to be leveled, and then applying a leveling putty layer after the thick putty layer is completely dried, so as to complete the leveling construction; wherein the volume ratio of the thick putty layer to the putty leveling layer is 1:(0.2-0.5).

[0028] In the present invention, the thick putty layer mainly functions to enable the putty to be thickly applied and effectively cover the unevenness and defects of the base layer, thereby simplifying the construction process; the putty leveling layer mainly functions to provide a good finishing effect and to be closely combined with the thick putty layer to ensure the comprehensive performance of the system.

[0029] In a preferred embodiment, the thick putty layer comprises the following components by weight: 70-85 parts of calcium carbonate, 10-15 parts of lime, 15-30 parts of lightweight aggregate, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

[0030] In a preferred embodiment, the putty leveling layer comprises the following components by weight: 75-85 parts of calcium carbonate, 10-15 parts of lime, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

[0031] In the present invention, when designing a thick putty layer and a putty leveling layer, the lightweight aggregate can reduce the bulk density of the product, so that the product can meet the requirements of thick application. The water retaining agent can evenly retain water in the slurry to ensure the workability of the product. The thickener increases the plasticity of the slurry, so that it does not flow when thickly applied.

[0032] In a preferred embodiment, the calcium carbonate is heavy calcium carbonate.

[0033] In a preferred embodiment, the lime is lime powder.

[0034] In a preferred embodiment, the lightweight aggregate includes expanded perlite or vitrified microspheres.

[0035] In a preferred embodiment, the water retaining agent includes one or more of carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose; preferably, the water retaining agent is hydroxypropyl methyl cellulose with a viscosity of 400-20000 mPa.s.

[0036] In a preferred embodiment, the thickener includes one or more of polyacrylate, polyurethane, etherified starch ether, and stearic acid.

[0037] In a preferred embodiment, the early strength agent includes one or more of triethanolamine, calcium formate, and polyvinyl alcohol.

[0038] In a preferred embodiment, the thick putty layer is prepared by the following method: weigh the raw materials used for the thick putty layer by weight, mix them evenly to obtain powder 1, add water to the powder 1 and stir evenly to obtain; preferably, when preparing the thick putty layer, the mass ratio of powder 1 to water is 1:(0.5-0.6).

[0039] In a preferred embodiment, when preparing the thick putty layer, the stirring speed of adding water is above 500 r / min. Preferably, the no-load speed of the mixer is 2200 r / min, and the stirring time of adding water is 60-120 s.

[0040] In the present invention, when preparing a thick putty layer, a higher amount of water added can increase the slurry yield and reduce the amount of material used per square meter.

[0041] In a preferred embodiment, the leveling putty layer is prepared by the following method: weigh the raw materials used for the leveling putty layer by weight, mix them evenly to obtain powder 2, add water to the powder 2 and stir evenly; preferably, when preparing the leveling putty layer, the mass ratio of powder 2 to water is 1:(0.4-0.5).

[0042] In a preferred embodiment, when preparing the leveling putty layer, the stirring speed of adding water is above 500 r / min. Preferably, the no-load speed of the mixer is 2200 r / min, and the stirring time of adding water is 60-120 s.

[0043] In the present invention, in the step of preparing the leveling putty layer, a lower amount of water added can improve the strength and mechanical properties of the finishing surface layer.

[0044] The technical solution of the present application is described in detail below through specific embodiments:

[0045] If not otherwise specified, the technical means used in the present invention are conventional means well known to those skilled in the art, and the various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods. The reagents used in the present invention are analytically pure unless otherwise specified. In the embodiments of the present invention, the model of the water-retaining agent used is HPMCG9518, and the manufacturer is Chongqing Pengkai; the model of the thickener is C301, and the manufacturer is Aiweibei; the model of the early strength agent is 1788, and the manufacturer is Tangshan Electric. In the present invention, parts by weight can be weight units known in the art such as μg, mg, g, kg, etc., or multiples thereof, such as 1 / 10, 1 / 100, 10 times, 100 times, etc.

[0046] Example 1

[0047] A plaster-free wall leveling construction method comprises the following steps:

[0048] Step 1: Prepare the composite plaster-free putty wall system leveling material:

[0049] Preparation of thick putty layer: weigh 70 parts of calcium carbonate, 15 parts of lime, 15 parts of lightweight aggregate (vitrified microspheres), 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent by weight, mix them evenly in a blender and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.53 for 120 seconds to obtain a thick putty layer.

[0050] Prepare the putty leveling layer: weigh 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent by weight, mix them evenly in a blender and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain the putty leveling layer.

[0051] Step 2: Construction of composite plaster-free putty wall system leveling materials:

[0052] like Figure 2 As shown in the figure, first apply a thick layer of putty on the surface of the wall base, and then apply a leveling putty layer after it is completely dry. The volume ratio of the thick putty layer to the putty leveling layer is 1:0.3, and the wall leveling construction can be completed. It can be seen from the figure that after applying only one thick putty layer and one putty leveling layer, the wall surface can be flat and uniform, and there is no powder falling or cracking after drying.

[0053] The composite plaster-free putty wall system leveling material prepared according to the JGT 298-2010 "Building Interior Putty" standard test has the following product performance as shown in Table 1:

[0054] Table 1 Performance of composite plaster-free putty wall system leveling materials

[0055] name Drying time (surface drying), h Tensile bond strength, MPa Thick putty layer 3 0.64 Putty leveling layer 1.5 0.81

[0056] The tensile bonding strength of the entire composite system is 0.63MPa, indicating that the thick putty layer and the putty leveling layer are evenly bonded and have a high bonding strength. After drying, there is no powdering or cracking.

[0057] Example 2

[0058] A plaster-free wall leveling construction method comprises the following steps:

[0059] Step 1: Prepare the composite plaster-free putty wall system leveling material:

[0060] Prepare a thick putty layer: mix 65 parts of calcium carbonate, 15 parts of lime, 20 parts of lightweight aggregate (vitrified microspheres), 4 parts of water-retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.55 for 120 seconds to obtain a thick putty layer.

[0061] Prepare putty leveling layer: 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent, mix well in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain the putty leveling layer.

[0062] Step 2: Construction of composite plaster-free putty wall system leveling materials:

[0063] First, apply a thick layer of putty on the surface of the wall base, and then apply a leveling putty layer after it is completely dry. The volume ratio of the thick putty layer to the putty leveling layer is 1:0.3, and the wall leveling construction can be completed.

[0064] The composite plaster-free putty wall system leveling material prepared according to the JGT 298-2010 "Building Interior Putty" standard test has product performance as shown in Table 2:

[0065] Table 2 Performance of composite plaster-free putty wall system leveling materials

[0066] name Drying time (surface drying), h Tensile bond strength, MPa Thick putty layer 4 0.61 Putty leveling layer 1.5 0.81

[0067] The tensile bonding strength of the entire composite system is 0.60MPa, indicating that the thick putty layer and the putty leveling layer are evenly bonded and have a high bonding strength. After drying, there is no powdering or cracking.

[0068] Example 3

[0069] A plaster-free wall leveling construction method comprises the following steps:

[0070] Step 1: Prepare the composite plaster-free putty wall system leveling material:

[0071] Prepare a thick putty layer: mix 60 parts of calcium carbonate, 15 parts of lime, 30 parts of lightweight aggregate (vitrified microspheres), 4.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.57 for 120 seconds to obtain a thick putty layer.

[0072] Prepare putty leveling layer: 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent, mix well in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain the putty leveling layer.

[0073] Step 2: Construction of composite plaster-free putty wall system leveling materials:

[0074] First, apply a thick layer of putty on the surface of the wall base, and then apply a leveling putty layer after it is completely dry. The volume ratio of the thick putty layer to the putty leveling layer is 1:0.3, and the wall leveling construction can be completed.

[0075] The composite plaster-free putty wall system leveling material prepared according to the JGT 298-2010 "Building Interior Putty" standard test has the following product performance as shown in Table 3:

[0076] Table 3 Performance of composite plaster-free putty wall system leveling materials

[0077] name Drying time (surface drying), h Tensile bond strength, MPa Thick putty layer 4.5 0.54 Putty leveling layer 1.5 0.81

[0078] The tensile bonding strength of the entire composite system is 0.55MPa, indicating that the thick putty layer and the putty leveling layer are evenly bonded and have a high bonding strength. After drying, there is no powdering or cracking.

[0079] Example 4

[0080] A plaster-free wall leveling construction method comprises the following steps:

[0081] Step 1: Prepare the composite plaster-free putty wall system leveling material:

[0082] Preparation of thick putty layer: weigh 70 parts of calcium carbonate, 15 parts of lime, 15 parts of lightweight aggregate (expanded perlite), 3.5 parts of water retaining agent, 0.3 parts of thickener, and 1.5 parts of early strength agent by weight, mix them evenly in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.53 for 120 seconds to obtain a thick putty layer.

[0083] Prepare the putty leveling layer: weigh 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent by weight, mix them evenly in a blender and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain the putty leveling layer.

[0084] Step 2: Construction of composite plaster-free putty wall system leveling materials:

[0085] First, apply a thick layer of putty on the surface of the wall base, and then apply a leveling putty layer after it is completely dry. The volume ratio of the thick putty layer to the putty leveling layer is 1:0.3, and the wall leveling construction can be completed.

[0086] The composite plaster-free putty wall system leveling material prepared according to the JGT 298-2010 "Building Interior Putty" standard test has product performance as shown in Table 4:

[0087] Table 4 Performance of composite plaster-free putty wall system leveling materials

[0088] name Drying time (surface drying), h Tensile bond strength, MPa Thick putty layer 3.5 0.58 Putty leveling layer 1.5 0.81

[0089] The tensile bonding strength of the entire composite system is 0.57MPa, indicating that the thick putty layer and the putty leveling layer are evenly bonded and have a high bonding strength. After drying, there is no powdering or cracking.

[0090] Example 5

[0091] A plaster-free wall leveling construction method comprises the following steps:

[0092] Step 1: Prepare the composite plaster-free putty wall system leveling material:

[0093] Preparation of thick putty layer: weigh 65 parts of calcium carbonate, 15 parts of lime, 20 parts of lightweight aggregate (expanded perlite), 4 parts of water retaining agent, 0.3 parts of thickener, and 1.5 parts of early strength agent by weight, mix them evenly in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.56 for 120 seconds to obtain a thick putty layer.

[0094] Prepare the putty leveling layer: weigh 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener and 1.5 parts of early strength agent by weight, mix them evenly in a blender and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain the putty leveling layer.

[0095] Step 2: Construction of composite plaster-free putty wall system leveling materials:

[0096] First, apply a thick layer of putty on the surface of the wall base, and then apply a leveling putty layer after it is completely dry. The volume ratio of the thick putty layer to the putty leveling layer is 1:0.3, and the wall leveling construction can be completed.

[0097] The composite plaster-free putty wall system leveling material prepared according to the JGT 298-2010 "Building Interior Putty" standard test has the following product performance as shown in Table 1:

[0098] Table 1 Performance of composite plaster-free putty wall system leveling materials

[0099] name Drying time (surface drying), h Tensile bond strength, MPa Thick putty layer 4 0.55 Putty leveling layer 1.5 0.81

[0100] The tensile bonding strength of the entire composite system is 0.55MPa, and after drying, there is no powdering or cracking.

[0101] Comparative Example 1

[0102] The conventional wall leveling construction method in the prior art comprises the following steps:

[0103] Step 1, prepare a gypsum leveling layer: weigh the following raw materials by weight: 63 parts of desulfurized gypsum, 28 parts of calcium carbonate, 9 parts of lightweight aggregate (vitrified microspheres), 3.5 parts of water retaining agent, 0.3 parts of thickener, and 1 part of retarder, mix them evenly in a blender and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.58 for 120 seconds to obtain a gypsum leveling layer.

[0104] Step 2, prepare a putty leveling layer: 85 parts of calcium carbonate, 15 parts of lime, 3.5 parts of water retaining agent, 0.3 parts of thickener, and 1.5 parts of early strength agent, mix them evenly in a mixer and set aside; stir the evenly mixed powder and water in a cement mortar mixer at a ratio of 1:0.45 for 120 seconds to obtain a putty leveling layer.

[0105] Step 3: After the gypsum is leveled as a whole, two coats of putty are used for leveling:

[0106] like Figure 3 As shown in the figure, the gypsum leveling layer is first applied on the surface of the wall base, and after it is completely dry, the first leveling putty layer is applied, and after it is completely dry, the second leveling putty layer is applied. The volume ratio of the gypsum layer to the single-layer putty layer is 1:0.13. According to the standard JGT 298-2010 "Putty for Building Interiors", the tensile bonding strength of the putty layer is 0.46MPa. It can be seen from the figure that after only applying the first coat of putty, the wall surface will still be uneven and bulge. The second coat of putty needs to be applied to make the wall surface flat and uniform.

[0107] In summary, the present invention provides an effective plaster-free wall leveling construction method and a composite plaster-free putty wall system leveling material. Specifically, a thick putty layer is formed by introducing lightweight aggregate to reduce construction procedures and reduce decoration costs; the flat surface is then protected by the putty leveling layer; finally, the thick putty layer is tightly combined with the putty leveling layer through raw material design and optimized formula to form a composite material. Under the premise of ensuring excellent strength performance, the thick putty layer can effectively cover the unevenness and defects of the base layer, eliminating the process of plastering and leveling, saving costs and simplifying the construction process.

[0108] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A plaster-free wall leveling construction method, characterized in that: The following steps are involved: Firstly, a thick putty layer is applied on the surface of the substrate to be leveled, and after it is completely dry, a leveling putty layer is applied to complete the leveling construction; wherein, the volume ratio of the thick putty layer to the putty leveling layer is 1:(0.2-0.5).

2. The plaster-free wall leveling construction method according to claim 1, characterized in that: The thick putty layer comprises the following components by weight: 70-85 parts of calcium carbonate, 10-15 parts of lime, 15-30 parts of lightweight aggregate, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

3. The plaster-free wall leveling construction method according to claim 1, characterized in that: The putty leveling layer comprises the following components by weight: 75-85 parts of calcium carbonate, 10-15 parts of lime, 3.5-4.5 parts of water retaining agent, 0.2-0.8 parts of thickener, and 1.0-2.0 parts of early strength agent.

4. The plaster-free wall leveling construction method according to claim 2 or 3, characterized in that: The calcium carbonate is heavy calcium carbonate; the lime is lime powder; the water retaining agent includes one or more of carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose; the thickener includes one or more of polyacrylate, polyurethane, etherified starch ether, and stearic acid; the early strength agent includes one or more of triethanolamine, calcium formate, and polyvinyl alcohol.

5. The plaster-free wall leveling construction method as claimed in claim 2, characterized in that: The lightweight aggregate includes expanded perlite and / or vitrified microspheres.

6. The plaster-free wall leveling construction method as claimed in claim 2, characterized in that: The thick putty layer is prepared by the following method: raw materials used for the thick putty layer are weighed in parts by weight, mixed evenly to obtain a powder 1, and water is added to the powder 1 and stirred evenly to obtain the thick putty layer.

7. The plaster-free wall leveling construction method as claimed in claim 6, characterized in that: When preparing the thick putty layer, the mass ratio of powder 1 to water is 1:(0.5-0.6).

8. The plaster-free wall leveling construction method as claimed in claim 3, characterized in that: The leveling putty layer is prepared by the following method: weighing raw materials used for the leveling putty layer according to weight proportions, mixing them evenly to obtain powder 2, adding water to the powder 2 and stirring evenly to obtain the powder 2.

9. The plaster-free wall leveling construction method as claimed in claim 8, characterized in that: When preparing the leveling putty layer, the mass ratio of powder 2 to water is 1:(0.4-0.5).

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