Decorative mortar, decorative slurry for forming a fleece surface, preparation and forming method

Abstract

The application provides a decorative mortar, a decorative slurry, a preparation and forming method for forming a flocked surface. The decorative mortar comprises, in mass parts, 19-23 parts of white cement, 9-11 parts of heavy calcium, 18-22 parts of first calcium sand, 23-27 parts of second calcium sand, 18-22 parts of third calcium sand, 1.5-2.5 parts of glue powder, 0.18-0.22 parts of water retention agent, 0.28-0.32 parts of lignocellulose and 0.0019-0.0021 parts of air entraining agent. The particle size of the first calcium sand is 20-40 mesh. The particle size of the second calcium sand is 40-70 mesh. The particle size of the third calcium sand is 70-140 mesh. By reasonably setting the components and the ratio, on the one hand, the performance indexes of the hardened mortar layer formed by the construction of the decorative mortar meet the requirements, and on the other hand, the proportion of the calcium sand in the decorative mortar is appropriate, and the corresponding slurry of the decorative mortar has a suitable viscosity, so that the flocked surface is easily formed.

Description

Technical Field

[0001] This invention relates to the field of decorative mortar, and more particularly to decorative mortar, decorative paste, preparation and formation method for forming a velvety surface. Background Technology

[0002] In recent years, interior decoration has mainly relied on puttying and painting, resulting in a monotonous texture for interior wall finishes. Decorative mortar refers to mortar used for building finishes. Through processing, decorative mortar can achieve unique surface finishes.

[0003] Among various finishes, one type is called a "fluffy surface" because its surface has numerous short, shallow grooves evenly distributed on it, resembling fluffy fibers. However, finishes created using ordinary decorative mortar cannot achieve the same fluffy effect. Summary of the Invention

[0004] The main objective of this invention is to provide a decorative mortar, decorative slurry, preparation method and forming method for forming a velvety surface, so as to solve the technical problem that the surface formed by general decorative mortar construction is prone to uneven distribution of unevenness and cannot present the effect of a velvety surface.

[0005] To achieve the above objectives, this application provides a decorative mortar for forming a fluffy surface, comprising, by weight: 19-23 parts white cement, 9-11 parts heavy calcium carbonate, 18-22 parts first calcium sand, 23-27 parts second calcium sand, 18-22 parts third calcium sand, 1.5-2.5 parts adhesive powder, 0.18-0.22 parts water-retaining agent, 0.28-0.32 parts lignocellulose, and 0.0019-0.0021 parts air-entraining agent.

[0006] The first type of calcium sand has a particle size of 20-40 mesh. The second type of calcium sand has a particle size of 40-70 mesh. The third type of calcium sand has a particle size of 70-140 mesh. The water-retaining agent includes a first cellulose ether and a second cellulose ether. The first cellulose ether is a methylcellulose ether with a viscosity of 14000-16000 mPa·s, and the second cellulose ether is a methylcellulose ether with a viscosity of 3000-5000 mPa·s.

[0007] According to the embodiments of this application, the mass ratio of the first calcium sand, the second calcium sand and the third calcium sand is 4:5:4.

[0008] According to the embodiments of this application, the mass ratio of white cement to adhesive powder is 21:2.

[0009] According to an embodiment of this application, the water-retaining agent comprises a first cellulose ether and a second cellulose ether. The mass ratio of the first cellulose ether to the second cellulose ether is (12-14):(6-8).

[0010] The first cellulose ether is a methylcellulose ether with a viscosity of 14,000–16,000 mPa·s. The second cellulose ether is a methylcellulose ether with a viscosity of 3,000–5,000 mPa·s.

[0011] According to the embodiments of this application, the decorative mortar comprises, by weight, 21 parts white cement, 10 parts heavy calcium carbonate, 20 parts first calcium sand, 25 parts second calcium sand, 20 parts third calcium sand, 2 parts adhesive powder, 0.2 parts water-retaining agent, 0.3 parts lignocellulose and 0.002 parts air-entraining agent.

[0012] According to the embodiments of this application, the decorative mortar further includes, by weight, 0.3 parts of thixotropic lubricant, 0.2 parts of water repellent, 0.1 parts of sodium gluconate, and 0.02 parts of starch ether.

[0013] This application also provides a method for preparing decorative mortar for forming a fluffy surface, comprising the following steps:

[0014] Prepare the raw materials according to the components and proportions of the decorative mortar used to form the velvety surface as described above.

[0015] The raw materials, excluding the first, second, and third calcium sands, are mixed according to the specified ratio under the conditions of stirring by a mixing mechanism and flying knife stirring to obtain an intermediate slurry.

[0016] Decorative mortar is obtained by mixing intermediate slurry, first calcium sand, second calcium sand and third calcium sand under the condition of mixing mechanism.

[0017] This application also provides a decorative paste for forming a velvety surface, comprising water and the aforementioned decorative mortar, wherein the mass of water is 23-25% of the mass of the decorative mortar.

[0018] This application also provides a method for forming a fluffy surface, comprising the following steps:

[0019] The decorative slurry is sprayed or applied to the target substrate to form a mortar intermediate layer. The decorative slurry consists of water and the aforementioned decorative mortar, with the water comprising 23-25% of the mass of the decorative mortar.

[0020] Pressure is applied to the construction surface, causing the pressure area of ​​the construction surface to move, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar that is far away from the target substrate.

[0021] According to embodiments of this application, a coating agent is also applied to the velvet surface.

[0022] The decorative mortar used to form a fluffy surface, by reasonably setting the components and proportions, ensures that the various performance indicators of the hardened mortar layer formed by the construction of the decorative mortar meet the requirements. On the other hand, it ensures that the proportion of calcium sand in the decorative mortar is appropriate, the particle size of calcium sand is appropriate, and the corresponding slurry of the decorative mortar has a suitable viscosity, which facilitates the formation of a fluffy surface finish. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a flowchart of a method for preparing decorative mortar for forming a fluffy surface according to an embodiment of this application;

[0025] Figure 2 This is a flowchart of a method for forming a fluffy surface according to an embodiment of this application;

[0026] Figure 3 This is a physical image of the velvet surface formed according to one embodiment of this application.

[0027] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0031] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] This application provides a decorative mortar for forming a fluffy surface, comprising, by weight: 19-23 parts white cement, 9-11 parts heavy calcium carbonate, 18-22 parts first calcium sand, 23-27 parts second calcium sand, 18-22 parts third calcium sand, 1.5-2.5 parts adhesive powder, 0.18-0.22 parts water-retaining agent, 0.28-0.32 parts lignocellulose, and 0.0019-0.0021 parts air-entraining agent. The first calcium sand has a particle size of 20-40 mesh. The second calcium sand has a particle size of 40-70 mesh. The third calcium sand has a particle size of 70-140 mesh. The water-retaining agent includes a first cellulose ether and a second cellulose ether. The first cellulose ether is a methylcellulose ether with a viscosity of 14000-16000 mPa·s, and the second cellulose ether is a methylcellulose ether with a viscosity of 3000-5000 mPa·s.

[0033] The applicant identified three main factors affecting the effect of the velvet surface: an appropriate proportion of calcium sand, suitable calcium sand particle size, and suitable viscosity of the decorative mortar slurry. These will be explained in detail below with reference to specific raw materials.

[0034] White cement, also known as white silicate cement, is a hydraulic cementitious material made by grinding white silicate cement clinker with low iron oxide content, an appropriate amount of gypsum, and mixed materials (limestone and kiln ash).

[0035] Heavy calcium carbonate, also known as precipitated calcium carbonate, is made by grinding natural carbonate minerals such as calcite, marble, and limestone. In some embodiments, heavy calcium carbonate is 300 mesh. Heavy calcium carbonate can replace part of white cement, thereby reducing the cost of decorative mortar and decreasing its alkali content.

[0036] Calcium sand is brittle and, compared to quartz sand, breaks into smaller particles even at lower stress levels. The particle size of calcium sand is relatively easy to control. Therefore, calcium sand with a relatively narrow particle size distribution can be obtained as needed. In this embodiment, since the raw materials for the decorative mortar include several calcium sands of different particle sizes, for ease of description, the calcium sands are named first calcium sand, second calcium sand, and third calcium sand according to their particle size differences. Specifically, the first calcium sand has a particle size of 20-40 mesh, the second calcium sand has a particle size of 40-70 mesh, and the third calcium sand has a particle size of 70-140 mesh.

[0037] The proportion of calcium sand can be understood as the percentage of various types of calcium sand. Because of its relatively narrow particle size distribution, calcium sand more easily meets the particle size requirements of decorative mortar gradation. The sand gradation is adjusted so that the mass ratio of the first, second, and third calcium sands is (18–22):(23–27):(18–22). Under these conditions, the sand is in a continuous gradation state, the decorative mortar is fully compacted, and the initial wind crack resistance meets the requirements.

[0038] The velvet surface includes flat and grooved sections. During the finishing process, the fully compacted decorative mortar can effectively create a relatively flat and smooth surface. The primary calcium sand particles are larger, and the grooves are mainly formed by the movement of the primary calcium sand within the mortar during construction due to pressure (e.g., being rubbed by a wooden board). The appropriate particle size and proportion of the primary calcium sand ensures suitable depth and number of grooves. The surface texture of the decorative surface is related to the amount of primary calcium sand added. After repeated construction and texture verification, the final determined primary calcium sand content was 18–22 parts by weight.

[0039] In this way, the flat part and the grooved part are clearly distinguishable without being too different. The area ratio of the flat part and the grooved part is also moderate, so that the fluffy surface presents a uniform distribution of flat and grooved parts with a consistent texture.

[0040] Compared to quartz sand, calcium sand contains fewer impurities, resulting in a purer, predominantly white color. Quartz sand, on the other hand, contains more impurities and has a yellowish tint. Therefore, choosing calcium sand as aggregate in decorative mortar results in a more aesthetically pleasing finish.

[0041] The adhesive powder is a redispersible latex powder, such as methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate.

[0042] Dimeric or terpolymers of acrylic acid compounds, such as esters, methacrylic acid, methyl methacrylate, and hydroxyethyl methacrylate, are formed by emulsion polymerization.

[0043] After dispersion, the adhesive powder can complex some free calcium ions, such as those found in calcium sand and heavy calcium carbonate, forming polymer particles with an external polymer film. The partially porous structure of the hardened mortar is filled by these polymer particles. This reduces the porosity of the hardened mortar, thereby decreasing its water absorption and helping to inhibit alkali return. Furthermore, it reduces microcracks within the hardened mortar, thus improving its interfacial tensile bond strength, flexural strength, and compressive strength.

[0044] Based on this, the applicant conducted numerous experiments on the content of white cement and adhesive powder, confirming the ratio of the two, which resulted in high interfacial tensile bond strength, flexural strength and compressive strength of the decorative mortar, and inhibited efflorescence of the hardened mortar.

[0045] Water-retaining agents give decorative mortar excellent water retention and thickening effects, significantly improving its workability. Specifically, water-retaining agents can increase the workability of decorative mortar, such as meeting the requirement of more than 60 minutes. Water-retaining agents can be one or more of cellulose ethers, such as methylcellulose ether, carboxymethylcellulose ether, hydroxypropyl methylcellulose ether, starch ether, or carboxyethylcellulose ether.

[0046] Since the mortar intermediate layer is formed after mixing and applying it to the wall, pressure needs to be applied to the construction surface, causing the pressured area of ​​the construction surface to move and form a fluffy surface. Specifically, for example, when a wooden board is rubbed clockwise on the mortar intermediate layer, the calcium sand (including the first, second, and third calcium sand) in the mortar intermediate layer needs to slide and leave traces in the mortar intermediate layer as the wooden board is rubbed.

[0047] To ensure the intermediate layer of the mortar possesses the aforementioned workability, a water-retaining agent is introduced into the finishing mortar to reduce its viscosity, and an air-entraining agent is introduced to improve the smoothness and feel of the finishing mortar during application. Specifically, the air-entraining agent, also known as an air-adapting agent, is a hydrophobic surfactant. During construction, water is added to the decorative mortar to form a decorative slurry. During the mixing process, the air-entraining agent reacts with water to generate a large number of tiny air bubbles, giving the decorative slurry better fluidity and thus reducing the mortar viscosity.

[0048] However, the introduction of water-retaining agents, insufficient mortar working time, and the introduction of air-entraining agents can lead to a decrease in the mortar's flexural strength, compressive strength, original tensile bond strength, and aged tensile bond strength. Through laboratory analysis of the air-entraining agent dosage, ensuring its own performance meets requirements while satisfying the workability of the finishing mortar, the final determined mass fraction of the air-entraining agent dosage was 0.0019–0.0021 parts.

[0049] The water-retaining agent includes a first cellulose ether and a second cellulose ether. The first cellulose ether is a methylcellulose ether with a viscosity of 14,000 to 16,000 mPa·s, and the second cellulose ether is a methylcellulose ether with a viscosity of 3,000 to 5,000 mPa·s.

[0050] The first cellulose ether is a methylcellulose ether with a viscosity range of 14,000 to 16,000 mPa·s, such as methylcellulose ether with a viscosity of 14,000 mPa·s, methylcellulose ether with a viscosity of 15,000 mPa·s, and methylcellulose ether with a viscosity of 16,000 mPa·s.

[0051] The second cellulose ether is a methylcellulose ether with a viscosity of 3000–5000 mPa·s. Examples include methylcellulose ethers with a viscosity of 3000 mPa·s, 4000 mPa·s, and 5000 mPa·s.

[0052] In subsequent actual construction, it was found that the decorative mortar of this embodiment has good fluidity, meets the requirements for pumpability, and can be applied using a spraying process. That is, this decorative mortar can be applied by hand troweling or by spraying. Applying the decorative mortar using a spraying process can improve construction efficiency.

[0053] The aforementioned decorative mortar for forming a velvety surface, through the rational setting of its components and proportions, ensures that the performance indicators of the hardened mortar layer formed during construction meet the requirements. Furthermore, it ensures that the proportion and particle size of calcium sand in the mortar are appropriate, and that the corresponding slurry has a suitable viscosity, facilitating the formation of the velvety surface finish. In addition, the finish formed by the aforementioned decorative mortar for forming a velvety surface possesses good inherent properties.

[0054] In some embodiments, the mass ratio of the first calcium sand, the second calcium sand, and the third calcium sand is 4:5:4. The decorative paste described above for forming a velvety surface exhibits a more uniform distribution of smooth and grooved portions, resulting in a more consistent texture.

[0055] In some embodiments, the mass ratio of white cement to adhesive powder is 21:2. In these embodiments, the strength of the decorative mortar is further improved.

[0056] In some embodiments, the water-retaining agent includes a first cellulose ether and a second cellulose ether, wherein the mass ratio of the first cellulose ether to the second cellulose ether is (12-14):(6-8), such as 13:7.

[0057] Under these conditions, the two types of methylcellulose ethers of the above viscosity are mixed together. Through their synergistic effect, the decorative mortar can meet both the requirement of a working time of more than 60 minutes and the requirement of initial drying crack resistance.

[0058] In some embodiments, the decorative mortar comprises, by weight, 21 parts white cement, 10 parts heavy calcium carbonate, 20 parts first calcium sand, 25 parts second calcium sand, 20 parts third calcium sand, 2 parts adhesive powder, 0.2 parts water-retaining agent, 0.3 parts lignocellulose, and 0.002 parts air-entraining agent.

[0059] The decorative mortar of this embodiment meets the standards in terms of workability, flexural strength, 28-day flexural strength, and 28-day compressive strength. Furthermore, the velvet surface exhibits a more uniform distribution of flat and grooved sections, resulting in a more consistent texture.

[0060] In some embodiments, the decorative mortar further comprises, by weight, 0.3 parts of thixotropic lubricant, 0.2 parts of water repellent, 0.1 parts of sodium gluconate, and 0.02 parts of starch ether.

[0061] In the aforementioned decorative mortar, appropriate amounts of thixotropic lubricant, water-repellent agent, sodium gluconate, and starch ether are added. For example, a decorative mortar, by weight, comprises: 21 parts white cement, 10 parts heavy calcium carbonate, 20 parts first calcium sand, 25 parts second calcium sand, 20 parts third calcium sand, 2 parts adhesive powder, 0.13 parts methyl cellulose ether with a viscosity of 15000 mPa·s, 0.07 parts methyl cellulose ether with a viscosity of 4000 mPa·s, 0.3 parts lignocellulose, 0.002 parts air-entraining agent, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.1 parts sodium gluconate, and 0.02 parts starch ether.

[0062] The performance of this decorative mortar has been further improved. Its workability, flexural strength, 28-day flexural strength, 28-day compressive strength, tensile bond strength, aging cycle tensile bond strength, alkali resistance, stain resistance, and weather resistance all meet the requirements of JC / T1024-2019 and are deemed qualified. Furthermore, the surface of the hardened mortar is more uniformly distributed in both smooth and grooved areas, resulting in a more consistent texture and an enhanced fluffy surface effect.

[0063] This application also provides a method for preparing decorative mortar for forming a fluffy surface, see [link to relevant documentation]. Figure 1 This includes the following steps:

[0064] S11: Prepare raw materials according to the components and proportions of the decorative mortar used to form a velvety surface as described above.

[0065] In this step, all raw materials are prepared according to the composition and proportion of the decorative mortar. The proportion of any two raw materials is the ratio of their corresponding mass parts.

[0066] S12: Mix the raw materials other than the first calcium sand, the second calcium sand and the third calcium sand according to the proportion, and mix them under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0067] In this step, the decorative mortar can be prepared in a mixing device, such as a mixing vessel, which includes both a mixing mechanism and a blade. The mixing mechanism and the blade can operate independently of each other, such as operating simultaneously for mixing, or one of them operating while the other is off. For example, only the mixing mechanism mixes, while the blade is off. During mixing, the frequency of the mixing device can be 50 Hz.

[0068] Specifically, raw materials other than the first, second, and third calcium sands are first added to the mixing tank. In some embodiments, white cement, heavy calcium carbonate, adhesive powder, methyl cellulose ether with a viscosity of 15000 mPa·s, methyl cellulose ether with a viscosity of 4000 mPa·s, lignocellulose, air-entraining agent, thixotropic lubricant, water-repellent agent, sodium gluconate, and starch ether are added to the mixing tank and stirred under dual stirring conditions of a stirring mechanism and a fly knife stirring to obtain an intermediate slurry. The stirring time can be 160–200 s, exemplarily 160 s, 180 s, 195 s, 200 s, etc.

[0069] S13: Decorative mortar is obtained by mixing intermediate slurry, first calcium sand, second calcium sand and third calcium sand under the condition of mixing mechanism.

[0070] In this step, the intermediate slurry and calcium sand need to be mixed. The intermediate slurry is located inside the mixer. For ease of operation, the first, second, and third calcium sands can be added to the mixing mechanism for further mixing. The mixing time can be 110–130 seconds (with the fly knife off), for example, 110 seconds, 113 seconds, 120 seconds, 127 seconds, 130 seconds, etc. Therefore, the components in the decorative mortar are mixed evenly.

[0071] This application also provides a decorative paste for forming a velvety surface, comprising water and the aforementioned decorative mortar, wherein the mass of water is 23-25% of the mass of the decorative mortar.

[0072] Decorative mortar used to form a velvety surface can be understood as mortar whose components do not include water, i.e., dry decorative mortar. Decorative grout used to form a velvety surface can be understood as mortar whose components include water, i.e., wet decorative mortar. The water content is 23-25% (e.g., 24%) of the mass of the decorative mortar.

[0073] Decorative slurry can be obtained by mixing decorative mortar and water. For example, add 23-25% water by its own weight to the decorative mortar and stir until the materials are evenly mixed to obtain decorative slurry.

[0074] The above-mentioned decorative slurry has qualified properties, good pumpability, and is suitable for the construction requirements of spraying process. Spraying can form a fluffy surface.

[0075] This application also provides a method for forming a fluffy surface, comprising the following steps:

[0076] S21: Apply decorative slurry by spraying or troweling to the target substrate to form a mortar intermediate layer. The decorative slurry includes water and the aforementioned decorative mortar, wherein the water accounts for 23-25% (e.g., 24%) of the mass of the decorative mortar.

[0077] Decorative mortar can be purchased pre-mixed or prepared on-site using decorative mortar and water. The target substrate is the building surface used to create the velvety finish, such as exterior or interior walls.

[0078] Decorative mortar can be applied initially by spraying or troweling to form the intermediate mortar layer. Applying decorative mortar by spraying, such as by placing it in a spraying device, improves construction efficiency.

[0079] S22: Apply pressure to the construction surface and cause the pressure area of ​​the construction surface to move, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar away from the target base surface.

[0080] Apply a certain pressure to the surface of the mortar intermediate layer away from the target substrate, such as pressing a board (such as a wooden board, plastic board, or metal board) onto the construction surface, and then move the board, such as rotating it (clockwise or counterclockwise). As a result, the part of the construction surface in contact with the board and the area under pressure move along with it, leaving traces in the mortar intermediate layer, thus forming a fluffy surface.

[0081] In some embodiments, see Figure 2 This also includes applying a coating agent to the velvet surface. The coating agent can protect the velvet surface and reduce the probability of alkali return.

[0082] In some embodiments, preprocessing of the target datum surface is also included. See [link to documentation]. Figure 2 If construction preparation is required, the target substrate can be leveled. After construction preparation is completed, an alkali-resistant primer can be applied by roller.

[0083] The technical solution of this application will be described in detail below with reference to specific embodiments and comparative examples.

[0084] Example 1

[0085] The decorative mortar used to form a velvety surface comprises, by weight:

[0086] 22 parts white cement, 10 parts heavy calcium carbonate, 20 parts first calcium sand, 25 parts second calcium sand, 20 parts third calcium sand, 2 parts adhesive powder, 0.17 parts first cellulose ether, 0.03 parts second cellulose ether, 0.3 parts lignocellulose, 0.002 parts air-entraining agent, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.1 parts sodium gluconate, and 0.02 parts starch ether.

[0087] The method for preparing the decorative mortar for forming a fluffy surface includes the following steps:

[0088] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the velvety surface as described above.

[0089] S102: Mix the raw materials other than the first calcium sand, the second calcium sand and the third calcium sand according to the proportion, and mix for 180s under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0090] S103: The intermediate slurry, the first calcium sand, the second calcium sand and the third calcium sand are mixed in a mixing mechanism for 120 seconds to obtain a decorative mortar for forming a fluffy surface.

[0091] The construction method for the decorative mortar used to form a fluffy surface includes the following steps:

[0092] S110: Apply decorative slurry by spraying or troweling to the target substrate to form a mortar intermediate layer. The decorative slurry comprises water and the aforementioned decorative mortar, with the water comprising 24% of the mass of the decorative mortar.

[0093] S120: Press a wooden board onto the construction surface and rub it clockwise. The sand in the intermediate layer of mortar will slide and leave marks in the mortar as the wooden board is rubbed, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar that is far away from the target base surface.

[0094] Example 2

[0095] The decorative mortar used to form a fluffy surface comprises, by weight: 19 parts white cement, 11 parts heavy calcium carbonate, 18 parts primary calcium sand, 27 parts secondary calcium sand, 18 parts tertiary calcium sand, 2.5 parts adhesive powder, 0.32 parts wood cellulose, 0.0021 parts air-entraining agent, 0.16 parts primary cellulose ether, 0.04 parts secondary cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.1 parts sodium gluconate, and 0.02 parts starch ether.

[0096] The method for preparing the decorative mortar for forming a fluffy surface includes the following steps:

[0097] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the velvety surface as described above.

[0098] S102: Mix the raw materials other than the first calcium sand, the second calcium sand and the third calcium sand according to the proportion, and mix for 190s under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0099] S103: The intermediate slurry, the first calcium sand, the second calcium sand and the third calcium sand are mixed in a mixing mechanism for 110 seconds to obtain a decorative mortar for forming a velvety surface.

[0100] The construction method for the decorative mortar used to form a fluffy surface includes the following steps:

[0101] S110: Apply decorative slurry by spraying or troweling to the target substrate to form a mortar intermediate layer. The decorative slurry comprises water and the aforementioned decorative mortar, with the water comprising 23% of the mass of the decorative mortar.

[0102] S120: Press a wooden board onto the construction surface and rub it clockwise. The sand in the intermediate layer of mortar will slide and leave marks in the mortar as the wooden board is rubbed, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar that is far away from the target base surface.

[0103] Example 3

[0104] The decorative mortar used to form a fluffy surface comprises, by weight: 23 parts white cement, 9 parts heavy calcium carbonate, 22 parts first calcium sand, 23 parts second calcium sand, 22 parts third calcium sand, 1.5 parts adhesive powder, 0.32 parts wood cellulose, 0.0019 parts air-entraining agent, 0.18 parts first cellulose ether, 0.02 parts second cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.1 parts sodium gluconate, and 0.02 parts starch ether.

[0105] The method for preparing the decorative mortar for forming a fluffy surface includes the following steps:

[0106] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the velvety surface as described above.

[0107] S102: Mix the raw materials other than the first calcium sand, the second calcium sand and the third calcium sand according to the proportion, and mix for 170s under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0108] S103: The intermediate slurry, the first calcium sand, the second calcium sand and the third calcium sand are mixed in a mixing mechanism for 130 seconds to obtain a decorative mortar for forming a velvety surface.

[0109] The construction method for the decorative mortar used to form a fluffy surface includes the following steps:

[0110] S110: Apply decorative slurry by spraying or troweling to the target substrate to form a mortar intermediate layer. The decorative slurry comprises water and the aforementioned decorative mortar, with the water comprising 22% of the mass of the decorative mortar.

[0111] S120: Press a wooden board onto the construction surface and rub it clockwise. The sand in the intermediate layer of mortar will slide and leave marks in the mortar as the wooden board is rubbed, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar that is far away from the target base surface.

[0112] Example 4

[0113] The decorative mortar used to form a fluffy surface comprises, by weight: 22 parts white cement, 9.5 parts heavy calcium carbonate, 19 parts primary calcium sand, 25 parts secondary calcium sand, 21 parts tertiary calcium sand, 1.8 parts adhesive powder, 0.31 parts lignocellulose, 0.002 parts air-entraining agent, 0.18 parts primary cellulose ether, 0.04 parts secondary cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.1 parts sodium gluconate, and 0.02 parts starch ether.

[0114] The method for preparing the decorative mortar for forming a fluffy surface includes the following steps:

[0115] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the velvety surface as described above.

[0116] S102: Mix the raw materials other than the first calcium sand, the second calcium sand and the third calcium sand according to the proportion, and mix for 180s under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0117] S103: The intermediate slurry, the first calcium sand, the second calcium sand and the third calcium sand are mixed in a mixing mechanism for 120 seconds to obtain a decorative mortar for forming a fluffy surface.

[0118] The construction method for the decorative mortar used to form a fluffy surface includes the following steps:

[0119] S110: Apply decorative slurry by spraying or troweling to the target substrate to form a mortar intermediate layer. The decorative slurry comprises water and the aforementioned decorative mortar, with the water comprising 25% of the mass of the decorative mortar.

[0120] S120: Press a wooden board onto the construction surface and rub it clockwise. The sand in the intermediate layer of mortar will slide and leave marks in the mortar as the wooden board is rubbed, so that the intermediate layer of mortar forms a fluffy surface. The construction surface is the surface of the intermediate layer of mortar that is far away from the target base surface.

[0121] Comparative Example 1

[0122] The only difference from Example 1 is that the decorative mortar used to form the velvety surface contains 17 parts white cement and 3 parts adhesive powder. The remaining components and steps are exactly the same.

[0123] Comparative Example 2

[0124] The only difference from Example 1 is that in the decorative mortar used to form the velvety surface, the first calcium sand is 15 parts, the second calcium sand is 16 parts, and the third calcium sand is 14 parts. The remaining components and steps are exactly the same.

[0125] Comparative Example 3

[0126] The only difference from Example 1 is that in the decorative mortar used to form the velvety surface, the first calcium sand contains 24 parts, the second calcium sand contains 12 parts, and the third calcium sand contains 10 parts. The remaining components and steps are exactly the same.

[0127] Comparative Example 4

[0128] The only difference from Example 1 is that the decorative mortar used to form the velvety surface includes only 0.017 parts of the first cellulose ether. The remaining components and steps are exactly the same.

[0129] Performance testing

[0130] The decorative mortars of Examples 1-4 and Comparative Examples 1-4 were tested for various properties. Workability, initial drying crack resistance, 30-minute water absorption, 240-minute water absorption, 28-day flexural strength, 28-day compressive strength, tensile bond strength, aging cycle tensile bond strength, alkali resistance, stain resistance, and weather resistance (750h) were all tested according to the standard JC / T1024-2019.

[0131] The requirements for the above indicators are as follows:

[0132] Workable time: 60 min, unobstructed application; Initial drying crack resistance: no cracks; 30 min water absorption ≤2g; 240 min water absorption ≤5g; 28 d flexural strength ≥2.5MPa; 28 d compressive strength ≥4.5MPa; Tensile bond strength ≥0.5MPa; Aging cycle tensile bond strength ≥0.4MPa; Alkali reversion resistance: no visible alkali efflorescence, no powdering; Stain resistance ≤2; Weather resistance (750h) ≤1.

[0133] The test results are shown in Table 1.

[0134] Table 1 Performance test results of various decorative mortars

[0135]

[0136]

[0137] As shown in Table 1, the aging cycle tensile bond strength of the decorative mortar in Comparative Example 1 did not meet the requirements of JC / T1024-2019 due to the unsuitable ratio of white cement and adhesive powder.

[0138] In Comparative Example 2, the proportion of calcium sand was not appropriate, which resulted in the initial drying crack resistance of the corresponding decorative mortar not meeting the requirements of JC / T1024-2019.

[0139] In Comparative Example 3, the proportion of calcium sand was not appropriate, which resulted in the initial drying crack resistance of the corresponding decorative mortar not meeting the requirements of JC / T1024-2019.

[0140] In Comparative Example 4, the unsuitable ratio of fiber ether resulted in the decorative mortar's workability and initial drying crack resistance failing to meet the requirements of JC / T1024-2019.

[0141] The decorative mortars provided in Examples 1-4 for forming a fluffy surface all meet the requirements of JC / T1024-2019 in terms of workability, initial drying crack resistance, 30-minute water absorption, 240-minute water absorption, 28-day flexural strength, 28-day compressive strength, tensile bond strength, aging cycle tensile bond strength, alkali resistance, stain resistance, and weather resistance (750h). The fluffy surface obtained by the construction method of the decorative mortar in Example 1, as shown... Figure 3 As shown. Figure 3 The surface finish shows that the flat and grooved sections are evenly distributed, resulting in a uniform texture and a good velvety appearance.

[0142] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A decorative mortar for forming a velvety surface, characterized in that, The composition by weight is as follows: 19-23 parts white cement, 9-11 parts heavy calcium carbonate, 18-22 parts primary calcium sand, 23-27 parts secondary calcium sand, 18-22 parts tertiary calcium sand, 1.5-2.5 parts adhesive powder, 0.18-0.22 parts water-retaining agent, 0.28-0.32 parts lignocellulose, and 0.0019-0.0021 parts air-entraining agent. The first calcium sand has a particle size of 20-40 mesh, the second calcium sand has a particle size of 40-70 mesh, and the third calcium sand has a particle size of 70-140 mesh; the water-retaining agent includes a first cellulose ether and a second cellulose ether, wherein the first cellulose ether is a methylcellulose ether with a viscosity of 14000~16000 mPa·s, and the second cellulose ether is a methylcellulose ether with a viscosity of 3000~5000 mPa·s; The mass ratio of the first cellulose ether to the second cellulose ether is (12~14):(6~8); The mass ratio of the first calcium sand, the second calcium sand, and the third calcium sand is 4:5:4; The mass ratio of the white cement to the adhesive powder is 21:

2.

2. The decorative mortar according to claim 1, characterized in that, The decorative mortar comprises, by weight, 21 parts white cement, 10 parts heavy calcium carbonate, 20 parts first calcium sand, 25 parts second calcium sand, 20 parts third calcium sand, 2 parts adhesive powder, 0.2 parts water-retaining agent, 0.3 parts wood cellulose, and 0.002 parts air-entraining agent.

3. The decorative mortar according to claim 1 or 2, characterized in that, The decorative mortar also includes, by weight, 0.3 parts of thixotropic lubricant, 0.2 parts of water-repellent agent, 0.1 parts of sodium gluconate, and 0.02 parts of starch ether.

4. A method for preparing decorative mortar for forming a velvety surface, characterized in that, Includes the following steps: Raw materials are prepared according to the components and proportions of the decorative mortar for forming a velvety surface as described in any one of claims 1 to 3; The raw materials, excluding the first, second, and third calcium sands, are mixed according to the specified ratio under the conditions of mixing by a mixing mechanism and a flying knife mixing to obtain an intermediate slurry. The decorative mortar is obtained by mixing the intermediate slurry, the first calcium sand, the second calcium sand, and the third calcium sand under the condition of mixing by a mixing mechanism.

5. A decorative paste for forming a velvety surface, characterized in that, The product comprises water and the decorative mortar according to any one of claims 1 to 3, wherein the water comprises 23 to 25% of the mass of the decorative mortar.

6. A method for forming a velvety surface, characterized in that, Includes the following steps: A decorative slurry is sprayed or applied to the target substrate to form a mortar intermediate layer; the decorative slurry comprises water and the decorative mortar according to any one of claims 1 to 3, wherein the mass of the water is 23% to 25% of the mass of the decorative mortar; Pressure is applied to the construction surface, causing the pressure area of ​​the construction surface to move, so that the intermediate layer of mortar forms the fluffy surface, and the construction surface is the surface of the intermediate layer of mortar away from the target base surface.

7. The method for forming the fuzzy surface according to claim 6, characterized in that, It also includes applying a coating agent to the velvet surface.

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