Decorative mortar, decorative slurry for forming lychee face, preparation and forming method

Abstract

The application provides a decorative mortar, a decorative slurry, a preparation and forming method for forming a lychee face. The decorative mortar comprises, in mass parts, 18-22 parts of white cement, 9-11 parts of heavy calcium, 16-20 parts of first quartz sand, 13-15 parts of second quartz sand, 11-13 parts of third quartz sand, 21-25 parts of calcium sand, 1.5-2.5 parts of glue powder, 0.18-0.22 parts of water retaining agent, 0.28-0.32 parts of wood cellulose and 0.0019-0.0021 parts of air entraining agent. The decorative mortar for forming a lychee face, by reasonably setting the components and the ratio, on the one hand, makes the quartz sand and the calcium sand form a continuous gradation, which helps to form a uniform distribution of the uneven texture of the finish, on the other hand, makes the decorative mortar form a decorative slurry that meets the conditions of spraying construction, thereby reducing the influence of the construction method of the construction personnel on the formation of the lychee face.

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 lychee finish. Background Technology

[0002] Decorative mortar refers to mortar used for building finishes. Decorative mortar can be processed to achieve special finishes.

[0003] Among various finishes, one type is called "lychee finish" because its surface has an uneven, granular texture resembling the grain of a lychee peel. However, finishes created with ordinary decorative mortar tend to have uneven distribution of texture and cannot achieve the desired lychee finish 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 lychee 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 lychee surface.

[0005] To achieve the above objectives, this application provides a decorative mortar for forming a lychee-like surface, comprising, by weight: 18-22 parts white cement, 9-11 parts heavy calcium carbonate, 16-20 parts first quartz sand, 13-15 parts second quartz sand, 11-13 parts third quartz sand, 21-25 parts 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 particle size of the first type of quartz sand is 1.18–2.36 mm. The particle size of the second type of quartz sand is 0.6–1.18 mm. The particle size of the third type of quartz sand is 0.3–0.16 mm. The particle size of the calcium sand is 70–140 mesh.

[0007] According to the embodiments of this application, the mass ratio of the first quartz sand, the second quartz sand, the third quartz sand and the calcium sand is 18:14:12:23.

[0008] According to the embodiments of this application, the mass ratio of white cement to adhesive powder is 20:2.

[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, 20 parts white cement, 10 parts heavy calcium carbonate, 18 parts first quartz sand, 14 parts second quartz sand, 12 parts third quartz sand, 23 parts calcium sand, 2 parts adhesive powder, 0.2 parts water-retaining agent, 0.3 parts wood cellulose 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, 0.12 parts of sodium gluconate and 0.03 parts of starch ether.

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

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

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

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

[0017] This application also provides a decorative paste for forming a litchi surface, comprising water and the above-mentioned decorative mortar, wherein the mass of water is 21-23% of the mass of the decorative mortar.

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

[0019] The decorative slurry is sprayed onto the target substrate to create a bush-hammered finish. The decorative slurry comprises water and the aforementioned decorative mortar, with the water comprising 21-23% of the mass of the decorative mortar.

[0020] According to the embodiments of this application, the decorative paste is sprayed onto the target substrate under the conditions of spraying air pressure of 1.2 bar and nozzle diameter of 8 mm.

[0021] The aforementioned decorative mortar for creating a bushy finish, through the rational setting of its components and proportions, ensures, on the one hand, that the quartz sand and calcium sand form a continuous gradation, contributing to a uniformly distributed, uneven texture on the surface. On the other hand, it ensures that the decorative mortar meets the conditions for spray application, thereby reducing the impact of the construction worker's techniques on the formation of the bushy finish. As a result, the aforementioned decorative mortar for creating a bushy finish produces a uniformly distributed, consistent texture, and a superior bushy finish appearance. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a flowchart of a method for preparing decorative mortar for forming a lychee-like surface according to an embodiment of this application;

[0024] Figure 2 This is a physical image of a litchi surface formed according to one embodiment of this application.

[0025] 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

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The applicant's research found that there are at least two reasons why decorative mortar finishes cannot achieve a bushy finish. Firstly, the mortar's gradation is unreasonable, preventing the finish from displaying a uniformly distributed texture. Secondly, the construction technique also affects the finish. For example, when using a plastering process, the decorative mortar is easily affected by inconsistent application techniques, leading to inconsistent textures and preventing the finish from achieving a bushy finish.

[0031] This application provides a decorative mortar for forming a lychee-like surface, comprising, by weight: 18-22 parts white cement, 9-11 parts heavy calcium carbonate, 16-20 parts first quartz sand, 13-15 parts second quartz sand, 11-13 parts third quartz sand, 21-25 parts 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 quartz sand has a particle size of 1.18-2.36 mm. The second quartz sand has a particle size of 0.6-1.18 mm. The third quartz sand has a particle size of 0.3-0.16 mm. The calcium sand has a particle size of 70-140 mesh.

[0032] Specifically, 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).

[0033] 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.

[0034] Quartz sand is a hard, wear-resistant, and chemically stable silicate mineral, whose main mineral component is silicon dioxide. In this embodiment, since the raw materials of the decorative mortar include several types of quartz sand with different particle sizes, for ease of description, the quartz sand is named as first quartz sand, second quartz sand, and third quartz sand according to the difference in particle size. The particle size of first quartz sand is 1.18–2.36 mm. The particle size of second quartz sand is 0.6–1.18 mm. The particle size of third quartz sand is 0.3–0.16 mm.

[0035] Calcium sand is brittle and, compared to quartz sand, will break into particles at a lower stress level.

[0036] Taking into account the particle size of the sand (i.e., quartz sand and calcium sand), the sand gradation is adjusted so that the mass ratio of the first quartz sand, the second quartz sand, the third quartz sand and the calcium sand is 16-20:13-15:11-13:21-25. Under this condition, the sand is in a continuous gradation state, the decorative mortar is fully compacted, and the initial wind crack resistance performance meets the requirements.

[0037] Furthermore, under this gradation condition, the surface of the hardened decorative mortar (hereinafter referred to as hardened mortar for ease of description) exhibits a uniformly distributed, uneven texture with a consistent feel, presenting a good decorative effect of the lychee surface.

[0038] The adhesive powder is a redispersible latex powder, such as a binary or terpolymer formed by emulsion polymerization of acrylic compound monomers such as methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methacrylic acid, methyl methacrylate, and hydroxyethyl methacrylate.

[0039] 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.

[0040] 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.

[0041] 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 ensuring it meets the requirement of more than 60 minutes. Water-retaining agents can be cellulose ethers, such as one or more of methylcellulose ether, carboxymethylcellulose ether, hydroxypropyl methylcellulose ether, starch ether, or carboxyethylcellulose ether.

[0042] To minimize the impact of construction workers' techniques on the formation of the bush-hammered finish and ensure a uniform texture, the decorative mortar in this embodiment can be applied using a spraying process. Specifically, the decorative mortar must meet the pumpability requirements of the spraying process. Furthermore, using a spraying process for the decorative mortar improves construction efficiency.

[0043] Air-entraining agents, also known as air-binding agents, are hydrophobic surfactants. During construction, decorative mortar is mixed with water to form a decorative slurry. During the mixing process, the air-entraining agent reacts with water to generate numerous tiny air bubbles, giving the decorative slurry good fluidity and thus meeting the requirements for mortar pumpability.

[0044] However, the introduction of air-entraining agents can lead to a decrease in the flexural strength, compressive strength, original tensile bond strength, and aged tensile bond strength of decorative mortar. Therefore, through analysis and experiments on the dosage of air-entraining agents, and to ensure that the decorative mortar meets the requirements for pumpability while maintaining its own performance, the final mass fraction of air-entraining agent dosage was determined to be 0.0019–0.0021 parts.

[0045] The aforementioned decorative mortar for creating a bushy finish, through the rational setting of its components and proportions, ensures, on the one hand, that the quartz sand and calcium sand form a continuous gradation, contributing to a uniformly distributed, uneven texture on the surface. On the other hand, it ensures that the decorative mortar meets the conditions for spray application, thereby reducing the impact of the construction worker's techniques on the formation of the bushy finish. As a result, the surface texture created by the aforementioned decorative mortar for forming a bushy finish is evenly distributed, has a uniform texture, and presents a good bushy finish effect. Furthermore, the surface itself formed by the aforementioned decorative mortar for forming a bushy finish has good properties.

[0046] In some embodiments, the mass ratio of the first quartz sand, the second quartz sand, the third quartz sand, and the calcium sand is 18:14:12:23. The decorative slurry described above for forming a lychee-like surface exhibits a more uniform distribution of uneven surface particles, a more consistent texture, and a better overall lychee-like finish.

[0047] In some embodiments, the mass ratio of white cement to adhesive powder is 20:2. In this embodiment, the strength of the decorative mortar is further improved.

[0048] In some embodiments, the water-retaining agent comprises 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. 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.

[0049] Experiments have shown that the mutual blending of the two types of methylcellulose ethers with the above-mentioned viscosity, under the synergistic effect of the two, enables the decorative mortar to meet both the requirement of an operating time of more than 60 minutes and the requirement of initial drying crack resistance.

[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 some embodiments, the decorative mortar comprises, by weight, 20 parts white cement, 10 parts heavy calcium carbonate, 18 parts first quartz sand, 14 parts second quartz sand, 12 parts third quartz sand, 23 parts calcium sand, 2 parts adhesive powder, 0.2 parts water-retaining agent, 0.3 parts wood cellulose and 0.002 parts air-entraining agent.

[0053] 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 surface texture of the hardened mortar has a more uniform distribution of uneven particles, resulting in a more consistent texture and a better presentation of the lychee-like finish.

[0054] In some embodiments, the decorative mortar further comprises, by weight, 0.3 parts of thixotropic lubricant, 0.2 parts of water repellent, 0.12 parts of sodium gluconate, and 0.03 parts of starch ether.

[0055] 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: 20 parts white cement, 10 parts heavy calcium carbonate, 18 parts first quartz sand, 14 parts second quartz sand, 12 parts third quartz sand, 23 parts 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, 0.12 parts sodium gluconate, and 0.03 parts starch ether.

[0056] 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 uniformity of the uneven texture distribution on the hardened mortar surface has been further improved, resulting in a more consistent texture and a better finish.

[0057] This application also provides a method for preparing decorative mortar for forming a lychee-like surface, see [link to relevant documentation]. Figure 1 This includes the following steps:

[0058] S11: Prepare the raw materials according to the components and proportions of the decorative mortar used to form the litchi surface as described above.

[0059] 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.

[0060] S12: Mix the raw materials other than the first quartz sand, the second quartz sand, the third quartz sand and calcium sand according to the proportion, and mix them for 160-200s under the conditions of mixing by a mixing mechanism and a flying knife to obtain an intermediate slurry.

[0061] 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.

[0062] Specifically, raw materials other than the first quartz sand, second quartz sand, third quartz sand, and calcium sand 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 the 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.

[0063] S13: Decorative mortar is obtained by mixing intermediate slurry, first quartz sand, second quartz sand, third quartz sand and calcium sand in a mixing mechanism for 110-130s.

[0064] In this step, the intermediate slurry and sand need to be mixed. The intermediate slurry is located inside the mixer. For ease of operation, the first, second, and third quartz sands, as well as calcium sand, can be added to the mixing mechanism for further mixing. The mixing time can be 110–130 seconds (with the cutting blades off), for example, 110 seconds, 113 seconds, 120 seconds, 127 seconds, 130 seconds, etc. Therefore, the components in the decorative mortar are mixed evenly.

[0065] This application also provides a decorative paste for forming a litchi surface, comprising water and the above-mentioned decorative mortar, wherein the mass of water is 21-23% of the mass of the decorative mortar.

[0066] Decorative mortar used to form a bushy finish can be understood as mortar that does not contain water, i.e., dry decorative mortar. Decorative paste used to form a bushy finish can be understood as mortar that includes water, i.e., wet decorative mortar. The water content is 21-23% (e.g., 22%) of the total mass of the decorative mortar.

[0067] Decorative slurry can be obtained by mixing decorative mortar and water. For example, add 21-23% water by its own weight to the decorative mortar and stir until the materials are evenly mixed to obtain decorative slurry.

[0068] The above-mentioned decorative slurry has qualified properties, good pumpability, and is suitable for the construction requirements of spraying process. Spraying can form a lychee surface.

[0069] This application also provides a method for forming litchi-like surface, comprising the following steps:

[0070] The decorative slurry is sprayed onto the target substrate to form a lychee finish. The decorative slurry includes water and the aforementioned decorative mortar, with the water comprising 21-23% (e.g., 22%) of the mass of the decorative mortar.

[0071] Decorative mortar can be purchased pre-mixed or prepared on-site using decorative mortar and water. The target substrate is the building surface to be formed into a bushy finish, such as exterior or interior walls. Applying the decorative mortar via spraying, such as placing it in a spraying device, reduces the impact of the application technique on the bushy finish formation, thus increasing the success rate of achieving the desired effect. It also ensures a uniform distribution of the uneven texture on the hardened mortar surface, resulting in a consistent and aesthetically pleasing bushy finish.

[0072] In some embodiments, the decorative paste is sprayed onto the target substrate at a spraying air pressure of 1.2 bar and a nozzle diameter of 8 mm.

[0073] The decorative slurry was placed in a spraying device (such as the M-TEC-Speed-MP model). After adjusting the parameters of the spraying device, the process parameters for achieving the desired lychee-finish decorative effect were determined. After multiple sprays, the air pressure for the mortar spraying was determined to be 1.2 bar. When the nozzle diameter of the spray gun was 8 mm, the uneven texture of the hardened mortar surface was more evenly distributed, the texture was more uniform, and the lychee-finish effect was better presented.

[0074] The technical solution of this application will be described in detail below with reference to specific embodiments and comparative examples.

[0075] Example 1

[0076] The decorative mortar used to form the lychee-like surface comprises, by weight parts: 20 parts white cement, 10 parts heavy calcium carbonate, 18 parts first quartz sand, 14 parts second quartz sand, 12 parts third quartz sand, 23 parts calcium sand, 2 parts adhesive powder, 0.3 parts wood cellulose, 0.002 parts air-entraining agent, 0.17 parts first cellulose ether, 0.03 parts second cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.12 parts sodium gluconate, and 0.03 parts starch ether.

[0077] The method for preparing the decorative mortar used to form a lychee-like surface includes the following steps:

[0078] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the litchi surface as described above.

[0079] S102: Mix the raw materials other than the first quartz sand, the second quartz sand, the third quartz sand and 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.

[0080] S103: The intermediate slurry, first quartz sand, second quartz sand, third quartz sand and calcium sand are mixed in a mixing mechanism for 120 seconds to obtain a decorative mortar for forming a litchi surface.

[0081] The construction method for the decorative mortar used to create a lychee-like finish includes the following steps:

[0082] S110: Add water to the decorative mortar used to form the lychee-like surface and stir until the materials are evenly mixed to obtain a decorative slurry. The mass of water is 22% of the mass of the decorative mortar used to form the lychee-like surface.

[0083] S120: Decorative mortar is placed in a spraying device, sprayed onto the wall surface at a spraying air pressure of 1.2 bar and a spray gun diameter of 8 mm. After hardening, hardened mortar is obtained. The surface of the hardened mortar is the finishing layer.

[0084] Example 2

[0085] The decorative mortar used to form the lychee-like surface comprises, by weight parts: 18 parts white cement, 11 parts heavy calcium carbonate, 16 parts first quartz sand, 15 parts second quartz sand, 11 parts third quartz sand, 25 parts calcium sand, 1.5 parts adhesive powder, 0.32 parts lignocellulose, 0.0021 parts air-entraining agent, 0.16 parts first cellulose ether, 0.04 parts second cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.12 parts sodium gluconate, and 0.03 parts starch ether.

[0086] The method for preparing the decorative mortar used to form a lychee-like surface includes the following steps:

[0087] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the litchi surface as described above.

[0088] S102: Mix the raw materials other than the first quartz sand, the second quartz sand, the third quartz sand and 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.

[0089] S103: The intermediate slurry, first quartz sand, second quartz sand, third quartz sand and calcium sand are mixed in a mixing mechanism for 110 seconds to obtain a decorative mortar for forming a litchi surface.

[0090] The construction method for the decorative mortar used to create a lychee-like finish includes the following steps:

[0091] S110: Add water to the decorative mortar used to form the lychee-like surface and stir until the materials are evenly mixed to obtain a decorative slurry. The mass of water is 21% of the mass of the decorative mortar used to form the lychee-like surface.

[0092] S120: Decorative mortar is placed in a spraying device, sprayed onto the wall surface at a spraying air pressure of 1.2 bar and a spray gun diameter of 8 mm. After hardening, hardened mortar is obtained. The surface of the hardened mortar is the finishing layer.

[0093] Example 3

[0094] The decorative mortar used to form the lychee-like surface comprises, by weight: 22 parts white cement, 9 parts heavy calcium carbonate, 20 parts first quartz sand, 13 parts second quartz sand, 13 parts third quartz sand, 21 parts calcium sand, 1.5 parts adhesive powder, 0.32 parts lignocellulose, 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, 0.12 parts sodium gluconate, and 0.03 parts starch ether.

[0095] The method for preparing the decorative mortar used to form a lychee-like surface includes the following steps:

[0096] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the litchi surface as described above.

[0097] S102: Mix the raw materials other than the first quartz sand, the second quartz sand, the third quartz sand and 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.

[0098] S103: The intermediate slurry, first quartz sand, second quartz sand, third quartz sand and calcium sand are mixed in a mixing mechanism for 130 seconds to obtain a decorative mortar for forming a litchi surface.

[0099] The construction method for the decorative mortar used to create a lychee-like finish includes the following steps:

[0100] S110: Add water to the decorative mortar used to form the lychee-like surface and stir until the materials are evenly mixed to obtain a decorative slurry. The mass of water is 22% of the mass of the decorative mortar used to form the lychee-like surface.

[0101] S120: Decorative mortar is placed in a spraying device, sprayed onto the wall surface at a spraying air pressure of 1.2 bar and a spray gun diameter of 8 mm. After hardening, hardened mortar is obtained. The surface of the hardened mortar is the finishing layer.

[0102] Example 4

[0103] The decorative mortar used to form the lychee-like surface comprises, by weight, 19 parts white cement, 10 parts heavy calcium carbonate, 17 parts first quartz sand, 15 parts second quartz sand, 14 parts third quartz sand, 22 parts calcium sand, 1.8 parts adhesive powder, 0.31 parts lignocellulose, 0.002 parts air-entraining agent, 0.18 parts first cellulose ether, 0.04 parts second cellulose ether, 0.3 parts thixotropic lubricant, 0.2 parts water-repellent agent, 0.12 parts sodium gluconate, and 0.03 parts starch ether.

[0104] The method for preparing the decorative mortar used to form a lychee-like surface includes the following steps:

[0105] S101: Prepare raw materials according to the components and proportions of the decorative mortar used to form the litchi surface as described above.

[0106] S102: Mix the raw materials other than the first quartz sand, the second quartz sand, the third quartz sand and 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.

[0107] S103: The intermediate slurry, first quartz sand, second quartz sand, third quartz sand and calcium sand are mixed in a mixing mechanism for 120 seconds to obtain a decorative mortar for forming a litchi surface.

[0108] The construction method for the decorative mortar used to create a lychee-like finish includes the following steps:

[0109] S110: Add water to the decorative mortar used to form the lychee-like surface and stir until the materials are evenly mixed to obtain a decorative slurry. The mass of water is 22% of the mass of the decorative mortar used to form the lychee-like surface.

[0110] S120: Decorative mortar is placed in a spraying device, sprayed onto the wall surface at a spraying air pressure of 1.2 bar and a spray gun diameter of 8 mm. After hardening, hardened mortar is obtained. The surface of the hardened mortar is the finishing layer.

[0111] Comparative Example 1

[0112] The only difference from Example 1 is that the decorative mortar used to form the lychee finish contains 17 parts white cement and 3 parts adhesive powder. The remaining components and steps are exactly the same.

[0113] Comparative Example 2

[0114] The only difference from Example 1 is that in the decorative mortar used to form the lychee surface, the first quartz sand is 15 parts, the second quartz sand is 16 parts, the third quartz sand is 14 parts, and the calcium sand is 27 parts. The remaining components and steps are exactly the same.

[0115] Comparative Example 3

[0116] The only difference from Example 1 is that the decorative mortar used to form the lychee surface contains 21 parts of first quartz sand, 12 parts of second quartz sand, 10 parts of third quartz sand, and 20 parts of calcium sand. The remaining components and steps are exactly the same.

[0117] Comparative Example 4

[0118] The only difference from Example 1 is that the decorative mortar used to form the lychee finish contains only 0.016 parts of the first cellulose ether. The remaining components and steps are exactly the same.

[0119] Performance testing

[0120] 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.

[0121] The requirements for the above indicators are as follows:

[0122] 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.

[0123] The test results are shown in Table 1.

[0124] Table 1 Performance test results of various decorative mortars

[0125]

[0126] As shown in Table 1, the 28-day flexural strength and 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.

[0127] In Comparative Example 2, the improper ratio of quartz sand and calcium sand resulted in the decorative mortar failing to meet the requirements of JC / T1024-2019 for initial drying crack resistance, 28-day flexural strength, 28-day flexural strength, and aging cycle tensile bond strength.

[0128] In Comparative Example 3, the improper ratio of quartz sand and calcium sand resulted in the initial drying crack resistance of the corresponding decorative mortar failing to meet the requirements of JC / T1024-2019.

[0129] In Comparative Example 4, the air-entraining agent ratio was not appropriate, resulting in the corresponding decorative mortar's workability and initial drying crack resistance failing to meet the requirements of JC / T1024-2019.

[0130] The decorative mortars provided in Examples 1-4 for forming a bushy finish all passed the following tests: 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), meeting the requirements of JC / T1024-2019. The bushy finish obtained by the construction method of the decorative mortar in Example 1, as shown... Figure 2 As shown. Figure 2 The surface texture is evenly distributed, with a consistent feel, and the lychee finish has a good presentation.

[0131] 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 lychee-like surface, characterized in that, The composition by weight is as follows: 18-22 parts white cement, 9-11 parts heavy calcium carbonate, 16-20 parts first quartz sand, 13-15 parts second quartz sand, 11-13 parts third quartz sand, 21-25 parts 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 quartz sand has a particle size of 1.18~2.36mm, the second quartz sand has a particle size of 0.6~1.18mm, the third quartz sand has a particle size of 0.3~0.16mm, and the calcium sand has a particle size of 70~140 mesh. The water-retaining agent comprises 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). 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. The mass ratio of the first quartz sand, the second quartz sand, the third quartz sand, and the calcium sand is 18:14:12:23; The mass ratio of the white cement to the adhesive powder is 20:

2.

2. The decorative mortar according to claim 1, characterized in that, The decorative mortar comprises, by weight, 20 parts white cement, 10 parts heavy calcium carbonate, 18 parts first quartz sand, 14 parts second quartz sand, 12 parts third quartz sand, 23 parts 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, 0.12 parts of sodium gluconate, and 0.03 parts of starch ether.

4. A method for preparing decorative mortar for forming a lychee-textured 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 lychee-like surface as described in any one of claims 1 to 3; The raw materials, excluding the first quartz sand, the second quartz sand, the third quartz sand and calcium sand, are mixed according to the proportions 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 quartz sand, the second quartz sand, the third quartz sand, and the calcium sand under the condition of mixing by a mixing mechanism.

5. A decorative paste for forming a lychee-like 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 21 to 23% of the mass of the decorative mortar.

6. A method for forming lychee-like surface, characterized in that, Includes the following steps: A decorative slurry is sprayed onto a target substrate to form a lychee finish; the decorative slurry comprises water and decorative mortar as described in any one of claims 1 to 3, wherein the mass of the water is 21 to 23% of the mass of the decorative mortar.

7. The method for forming the litchi surface according to claim 6, characterized in that, The decorative paste is sprayed onto the target substrate under a spraying air pressure of 1.2 bar and a nozzle diameter of 8 mm.

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