Non-blooming dry powder artistic microcement and method for its preparation

Abstract

The application discloses a dry powder artistic micro-cement without efflorescence and a preparation method thereof, and belongs to the technical field of artistic cement preparation.The dry powder artistic micro-cement without efflorescence disclosed by the application comprises the following raw materials in parts by weight: white cement 25-60 parts, artistic sand 25-50 parts, latex powder 3-8 parts, cellulose 0.2-0.8 parts, dispersing agent 0.2-0.5 parts, wetting agent 0.1-0.5 parts, defoaming agent 0.1-0.6 parts, water reducing agent 0.1-0.5 parts and wood fiber 0.2-1 part.The dispersing agent, the wetting agent and the like used in the application have special effects;after the dry powder artistic micro-cement is prepared by using a reasonable ratio, the efflorescence resistance of the micro-cement can be improved, and the artistic beauty of the artistic micro-cement, i.e., the artistic beauty of light and uneven color, can be more fully displayed.

Description

Technical Field

[0001] This invention belongs to the field of art cement preparation technology, specifically relating to a non-blooming dry powder art micro cement and its preparation method. Background Technology

[0002] In recent years, minimalist, wabi-sabi, and industrial styles have become increasingly popular among interior designers. This popularity has led to the rise of microcement, a new type of decorative material. True microcement is a new type of decorative coating composed of eco-friendly inorganic cement, mineral materials, water-based resins, and other natural and environmentally friendly materials. It is perfectly suited to the aforementioned styles and can be applied to any flat surface, including walls, floors, ceilings, and cabinets. In terms of effect, high-quality microcement is delicate and textured. When applied in batches, it creates a unique mottled effect, eliminating the need to consider seams and creating a continuous, unified visual space that enhances the sense of space and sophistication. In terms of performance, microcement boasts high hardness, wear and scratch resistance, impact resistance, good fire resistance, and high environmental performance.

[0003] However, the main component of microcement is inorganic cement. During the drying and gelation process, alkaline substances migrate to the paint film surface with the evaporation of moisture. Ca(OH)2 reacts with CO2 in the air to produce an "alkali efflorescence" phenomenon. After white microcement is tinted, the varying degrees of "alkali whitening" on the paint film will overlap with the color of the pigment. In addition, the pigment's color development in the cement-based system is poor and prone to flocculation. As a result, it is very easy to form areas of different color depths, resulting in an overall mottled appearance. For example, the existing technology CN114181555A discloses a dry powder microcement and its preparation method. This scheme adds lime, anhydrite, and lithium silicate, which can improve the wear resistance and surface hardness of the product. However, this scheme mainly uses lime cement, and the product application will have the problem of mottled appearance. If white cement is used and then tinted, there is no dispersing and wetting material in the system, the color development of the pigment is poor, and the use of lime further aggravates the occurrence of "alkali whitening" (the anti-alkali efflorescence agent has limited effect). The product application results in severe mottled appearance of the paint film (e.g., Figure 12 (As shown).

[0004] Therefore, it is particularly important to develop an artistic microcement that does not develop mottled patterns when applied, which can greatly increase the application range of microcement products and at the same time more fully showcase the artistic beauty of "light mottled" microcement. Summary of the Invention

[0005] This invention provides a non-blemishable dry powder art microcement and its preparation method, to solve the problem that existing art microcement is prone to blemish formation during tinting and application.

[0006] In a first aspect, the present invention provides a non-blooming dry powder art micro-cement, comprising, by weight, the following raw materials: 25-60 parts white cement, 25-50 parts art sand, 3-8 parts latex powder, 0.2-0.8 parts cellulose, 0.2-0.5 parts dispersant, 0.1-0.5 parts wetting agent, 0.1-0.6 parts defoamer, 0.1-0.5 parts water-reducing agent, and 0.2-1 parts wood fiber.

[0007] Preferably, by weight, it comprises the following raw materials: 30-40 parts white cement, 30-40 parts artistic sand, 4-5 parts latex powder, 0.3-0.5 parts cellulose, 0.3-0.4 parts dispersant, 0.2-0.4 parts wetting agent, 0.2-0.5 parts defoamer, 0.2-0.3 parts water-reducing agent, and 0.5-0.75 parts wood fiber.

[0008] More preferably, the raw materials, by weight, include the following: 35 parts white cement, 35 parts artistic sand, 5 parts latex powder, 0.4 parts cellulose, 0.3 parts dispersant, 0.3 parts wetting agent, 0.4 parts defoamer, 0.2 parts water-reducing agent, and 0.5 parts wood fiber.

[0009] Preferably, the dispersant is a dispersant that has a chelating effect on metal ions, including organic chelating dispersants and inorganic chelating dispersants.

[0010] Preferably, the inorganic chelating dispersant includes at least one selected from orthophosphate, pyrophosphate, metaphosphate, and polyphosphate.

[0011] More preferably, the orthophosphate includes disodium hydrogen phosphate and / or trisodium phosphate, the pyrophosphate includes sodium pyrophosphate and / or potassium pyrophosphate, the metaphosphate is sodium hexametaphosphate, and the polyphosphate includes sodium tripolyphosphate and / or potassium tripolyphosphate.

[0012] The beneficial effects of the above scheme are as follows: In this invention, the inorganic dispersant selected is an alkali metal phosphate dispersant (including orthophosphate, pyrophosphate, and metaphosphate). These dispersants have excellent dispersing effects on the system materials and greatly aid in the color development of added pigments. More importantly, they are also excellent metal chelating agents, exhibiting good chelating effects on polyvalent metal ions. In the cement system, when the dispersant adsorbs onto the surface of cement particles, it simultaneously affects the Ca in the system... 2+ It has excellent chelating properties, greatly slowing down the calcium absorption. 2+ During the drying process of the paint film, as moisture evaporates and migrates to the surface of the paint film, the appearance effect is that the "alkali whitening" phenomenon is greatly improved. For tinted micro cement, since the "alkali whitening" is slowed down, there is not much white substance on the paint film surface that overlaps with the color paste. In addition, the color paste develops well in the system, resulting in a uniform paint film color and solving the problem of blooming.

[0013] Preferably, the white cement is white silicate cement, including at least one of 32.5 white silicate cement, 42.5 white silicate cement and 52.5 white silicate cement; the artistic sand is quartz sand or calcium sand.

[0014] Preferably, the mesh size of the art sand is 70-100 mesh. When preparing the premixed material, priority is given to screening the art sand with the finer particle size.

[0015] Preferably, the wetting agent is a nonionic dry powder wetting agent and / or anionic dry powder wetting agent.

[0016] The beneficial effects of the above scheme are: the wetting agent can help the filler in the system to be quickly wetted by water, greatly shorten the mixing time, and also help the color development of the pigment in the system, thereby improving the color uniformity of the micro cement after color adjustment.

[0017] Preferably, the latex powder is a copolymer of vinyl acetate and ethylene and / or a copolymer of styrene and acrylate. More preferably, a VAE powder with a high Tg is selected.

[0018] As a secondary film-forming substance, latex powder can improve the adhesion and durability of microcement, while also enhancing its elasticity and flexibility, and improving the product's crack resistance and impact resistance (cement film is very rigid and brittle after formation). It also helps with the early hardness of microcement products (cement hardness increases relatively slowly).

[0019] Preferably, the cellulose is hydroxypropyl methylcellulose and / or hydroxyethyl cellulose, and the water-reducing agent is at least one of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, and aliphatic water-reducing agent.

[0020] Secondly, the present invention provides a method for preparing non-flowering dry powder art micro-cement as described in any of the first aspects, comprising the following steps:

[0021] Cellulose, dispersant, wetting agent, and defoamer are each mixed with 10 times their respective weight of artistic sand to obtain a premixed material;

[0022] The white cement, remaining artistic sand, adhesive powder, premixed cellulose, premixed dispersant, premixed wetting agent, premixed defoamer, premixed water-reducing agent, and wood fiber are mixed in the following order for the first time.

[0023] After the first mixing, releasing a portion of the bottom material (5wt%) and re-introducing it for a second mixing can improve the mixing effect.

[0024] Preferably, the instrument for the first and second mixing is a mixer with a mixing paddle and a high-speed dispersing blade. The mixing paddle rotates at 100-200 rpm, the high-speed dispersing blade rotates at 800-1000 rpm, and the mixing time for both mixing operations is 15-20 minutes.

[0025] A preferred method for preparing non-blooming dry powder art microcement includes the following steps:

[0026] Prepare white cement, artistic sand, latex powder, cellulose, dispersant, wetting agent, defoamer, water-reducing agent, and wood fiber according to the formula weight, and set aside;

[0027] In a small dry powder mixer, cellulose and art sand with a mass of 10 times that of cellulose are premixed to obtain premixed cellulose.

[0028] In a small dry powder mixer, the dispersant and 10 times the mass of the art sand are premixed to obtain a premixed dispersant.

[0029] In a small dry powder mixer, the wetting agent and 10 times the mass of the wetting agent art sand are premixed to obtain a premixed wetting agent.

[0030] In a small dry powder mixer, the defoamer and 10 times the mass of the defoamer art sand are premixed to obtain a premixed defoamer.

[0031] In a small dry powder mixer, the water-reducing agent and 10 times the mass of the water-reducing agent art sand are premixed to obtain a premixed water-reducing agent.

[0032] Add the white cement, remaining art sand, adhesive powder, premixed cellulose, premixed dispersant, premixed wetting agent, premixed defoamer, premixed water-reducing agent, and wood fiber in sequence into a mixer equipped with a mixing paddle and a high-speed dispersing blade. The mixing paddle speed is 100-200 rpm, and the high-speed dispersing blade speed is 800-1000 rpm. After mixing for 15-20 minutes, stop the machine, release the bottom 5 wt% of the mixture, return it to the furnace, and continue mixing for 15 minutes.

[0033] Compared with the prior art, the technical solutions provided in this application have at least the following advantages:

[0034] 1. This invention uses a dispersant with chelating properties, which on the one hand affects Ca... 2+ It has a good chelating and binding effect, weakening and slowing down Ca 2+As moisture evaporates, it migrates to the surface of the paint film, greatly reducing the occurrence of "alkali whitening" and avoiding the superposition of "alkali whitening" and pigment color. At the same time, the inorganic dispersant has good dispersion of cement and quickly adsorbs on the cement surface to form a double electric layer. The filler with adsorbed dispersant will not excessively compete with the dispersant on the surface of the pigment, enhancing the compatibility and color development of the pigment in the micro cement system. The overall color uniformity is very good, and the paint film does not bloom after trowel application. For existing dry powder micro cement technology, the blooming problem is completely solved.

[0035] 2. This invention uses a high-Tg VAE (preferably 52.5) ​​combined with white silicate cement as the film-forming material. While ensuring the final hardness, flexibility, crack resistance, and impact resistance of the product, it also improves the early hardness. The product has very high fire resistance, reaching Class A, extremely low VOCs, and high environmental performance.

[0036] 3. This invention has a high degree of construction tolerance. It uses HPMC with good water retention properties and wood fibers with cross-linking properties that can form a three-dimensional structure, ensuring that the product has a long open time and that the construction and overlapping operation time of the product is longer. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a wall surface with a floral pattern.

[0040] Figure 2 This is a diagram illustrating a mottled wall surface.

[0041] Figure 3 This is an illustration of a wall surface with a subtle mottled effect (light mottled effect).

[0042] Figure 4 A large-area rendering of a wall with floral patterns;

[0043] Figure 5 A rendering of a large area of ​​a wall with a mottled texture;

[0044] Figure 6 A large-area rendering of a wall surface with a subtle mottled effect (lightly mottled).

[0045] Figure 7This is a diagram illustrating the pattern of color formation at the overlap after brushing the paint on both the front and back.

[0046] Figure 8 Test report on hazardous substances in artistic micro-cement;

[0047] Figure 9 Test report on the combustion performance of art microcement;

[0048] Figure 10 Photographs of samples used for testing the combustion performance of art microcement;

[0049] Figure 11 Comparison images of the combustion performance of artistic microcement before and after testing;

[0050] Figure 12 This is a schematic diagram of the existing technology of dry powder micro-cement blooming. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0053] In a first aspect, this application provides a non-blooming dry powder art micro-cement, which, by weight, comprises the following raw materials: 25-60 parts white cement, 25-50 parts art sand, 3-8 parts latex powder, 0.2-0.8 parts cellulose, 0.2-0.5 parts dispersant, 0.1-0.5 parts wetting agent, 0.1-0.6 parts defoamer, 0.1-0.5 parts water-reducing agent, and 0.2-1 parts wood fiber.

[0054] In this invention, when water-based pigment paste is added to a cement system, insufficient or unsuitable amounts of wetting and dispersing agents can cause pigment and filler particles in the system to compete for the dispersant on the surface of the pigment paste, resulting in poor color development and easy flocculation. During trowel application, the trowel is used to collect the material, somewhat like "finger rubbing." Due to the poor color development of the pigment, significant color differences occur. This invention addresses this issue by introducing inorganic dispersants and dry powder wetting agents. The inorganic dispersant disperses very quickly and can rapidly adsorb onto the surface of cement particles to form a double electrical layer, preventing pigments and fillers (cement) in the system from competing for the dispersant on the surface of the pigment paste. Simultaneously, the wetting agent in the system accelerates the wetting of pigments and fillers with water, thus speeding up the aforementioned process.

[0055] In this invention, the three-dimensional network structure of wood fibers can effectively absorb and weaken the mechanical energy generated during the curing and drying process of the microcement system, resulting in excellent crack resistance. It can also improve the workability of the microcement. During application, the aqueous substances within the three-dimensional network of wood fibers are released into the system, leading to a decrease in viscosity and an increase in workability. When the shear force disappears, the system returns to its original viscosity. Furthermore, the three-dimensional network structure of wood fibers absorbs water and provides a certain degree of "overlapping" within the system. Under the same viscosity conditions, this allows for a thicker application and facilitates construction. The water absorption also slows down moisture evaporation, contributing to a longer open time.

[0056] In this invention, the inorganic film-forming material has a relatively loose and porous structure. When applying the second coat of micro-cement, the first coat of micro-cement, after drying, has a strong water-absorbing effect on the freshly applied second coat, leading to excessively fast surface drying. Since it is a trowel-applied product, this excessively fast surface drying will create overlap marks at the joints (which can also be considered a form of blooming). On the other hand, if the drying time of cement-based products is too long, the more time alkaline substances have to migrate to the paint film surface with the moisture, and the greater the degree of migration, the more severe the "alkali whitening" phenomenon becomes. Therefore, this invention uses low-molecular-weight HPMC to enhance water retention and extend the surface drying time, allowing more time for overlapping during application. Large-area application can effectively reduce overlap marks. At the same time, water-reducing agents, retarders, and early-strength agents are preferred to reduce the drying time while ensuring that the activation period meets the requirements, allowing free water to evaporate quickly after application.

[0057] Regarding the concepts of mottled, patchy, and subtle patchy appearance, the attached... Figure 1-7 It can be seen that the artistic beauty of the slightly mottled texture of artistic microcement needs to be achieved through the formulation in this invention.

[0058] Preferably, by weight, it comprises the following raw materials: 30-40 parts white cement, 30-40 parts artistic sand, 4-5 parts latex powder, 0.3-0.5 parts cellulose, 0.3-0.4 parts dispersant, 0.2-0.4 parts wetting agent, 0.2-0.5 parts defoamer, 0.2-0.3 parts water-reducing agent, and 0.5-0.75 parts wood fiber.

[0059] More preferably, the raw materials, by weight, include the following: 35 parts white cement, 35 parts artistic sand, 5 parts latex powder, 0.4 parts cellulose, 0.3 parts dispersant, 0.3 parts wetting agent, 0.4 parts defoamer, 0.2 parts water-reducing agent, and 0.5 parts wood fiber.

[0060] Preferably, the dispersant is a dispersant that has a chelating effect on metal ions, including organic chelating dispersants and inorganic chelating dispersants.

[0061] Preferably, the inorganic chelating dispersant includes at least one selected from orthophosphate, pyrophosphate, metaphosphate, and polyphosphate.

[0062] More preferably, the orthophosphate includes disodium hydrogen phosphate and / or trisodium phosphate, the pyrophosphate includes sodium pyrophosphate and / or potassium pyrophosphate, the metaphosphate is sodium hexametaphosphate, and the polyphosphate includes sodium tripolyphosphate and / or potassium tripolyphosphate.

[0063] Preferably, the white cement is white silicate cement, including at least one of 32.5 white silicate cement, 42.5 white silicate cement and 52.5 white silicate cement; the artistic sand is quartz sand or calcium sand.

[0064] Preferably, the mesh size of the art sand is 70 to 100.

[0065] Preferably, the wetting agent is a nonionic dry powder wetting agent and / or anionic dry powder wetting agent, and the latex powder is a copolymer of vinyl acetate and ethylene and / or a copolymer of styrene and acrylate.

[0066] Preferably, the cellulose is hydroxypropyl methylcellulose and / or hydroxyethyl cellulose, and the water-reducing agent is at least one of polycarboxylate water-reducing agent, naphthalene-based water-reducing agent, and aliphatic water-reducing agent.

[0067] Preferably, the wood fiber is white wood fiber or grayish-white wood fiber, preferably with a length of 200-700 mm, more preferably 500 mm.

[0068] Secondly, based on a general inventive concept, this application provides a method for preparing non-flowering dry powder art microcement, comprising the following steps:

[0069] Cellulose, dispersant, wetting agent, and defoamer are each mixed with 10 times their respective weight of artistic sand to obtain a premixed material;

[0070] The white cement, remaining artistic sand, adhesive powder, premixed cellulose, premixed dispersant, premixed wetting agent, premixed defoamer, premixed water-reducing agent, and wood fiber are mixed in the following order for the first time.

[0071] After the first mixing is completed, some material is released for a second mixing.

[0072] Preferably, the instrument for the first and second mixing is a mixer with a mixing paddle and a high-speed dispersing blade. The mixing paddle rotates at 100-200 rpm, the high-speed dispersing blade rotates at 800-1000 rpm, and the mixing time for both mixing operations is 15-20 minutes.

[0073] A preferred method for preparing non-blooming dry powder art microcement includes the following steps:

[0074] Prepare white cement, artistic sand, latex powder, cellulose, dispersant, wetting agent, defoamer, water-reducing agent, and wood fiber according to the formula weight, and set aside;

[0075] In a small dry powder mixer, cellulose and art sand with a mass of 10 times that of cellulose are premixed to obtain premixed cellulose.

[0076] In a small dry powder mixer, the dispersant and 10 times the mass of the art sand are premixed to obtain a premixed dispersant.

[0077] In a small dry powder mixer, the wetting agent and 10 times the mass of the wetting agent art sand are premixed to obtain a premixed wetting agent.

[0078] In a small dry powder mixer, the defoamer and 10 times the mass of the defoamer art sand are premixed to obtain a premixed defoamer.

[0079] In a small dry powder mixer, the water-reducing agent and 10 times the mass of the water-reducing agent art sand are premixed to obtain a premixed water-reducing agent.

[0080] Add the white cement, remaining art sand, adhesive powder, premixed cellulose, premixed dispersant, premixed wetting agent, premixed defoamer, premixed water-reducing agent, and wood fiber in sequence into a mixer equipped with a mixing paddle and a high-speed dispersing blade. The mixing paddle speed is 100-200 rpm, and the high-speed dispersing blade speed is 800-1000 rpm. After mixing for 15-20 minutes, stop the machine, release the bottom 5% of the mixture, return it to the furnace, and continue mixing for 15 minutes.

[0081] The white cement used in the following examples was purchased from Alboportland (Anqing) Co., Ltd., and is 52.5 white silicate cement. It serves as the main gelling or film-forming substance. The higher the grade, the higher the strength.

[0082] The quartz sand used in the following examples was purchased from Hongfa Pure Quartz Sand Factory in Longchuan County. It is 80-mesh or 90-mesh quartz sand. Compared with calcium sand, quartz sand has a higher hardness. The coarser the sand particles, the rougher the effect of the coating and the thicker the paint film.

[0083] The latex powder used in the following examples is preferably Wacker Chemie 5010N, Elastane FX2350, or Wacker Chemie 5044N.

[0084] The cellulose used in the following examples is preferably HPMC with a 2% aqueous solution viscosity of 10,000 to 70,000, and more preferably ME40M, all purchased from Suzhou Cellutech Chemical Co., Ltd. HPMC has better water retention properties in cement systems. Selecting HPMC with a relatively low viscosity helps improve the water retention, thixotropy, and adhesion properties of the microcement system, prolongs the open time of the paint film, and improves the workability of microcement products.

[0085] The dispersants used in the following examples are inorganic chelating dispersants and / or organic chelating dispersants, preferably orthophosphates, pyrophosphates, metaphosphates, or polyphosphates, and more preferably sodium pyrophosphate, sodium hexametaphosphate, or sodium tripolyphosphate, with sodium tripolyphosphate being the most preferred. All were purchased from Chongqing Wansheng Chuandong Chemical Co., Ltd.

[0086] The wetting agents used in the following examples are nonionic dry powder wetting agents and / or anionic dry powder wetting agents, purchased from Mingling Chemical's P588 wetting agent or Mingling Chemical's DF80 wetting agent.

[0087] The defoamers used in the following examples are organic modified siloxanes and / or polyol-type defoamers, specifically P804 or P803 defoamers purchased from Mingling Chemical, which can help the product defoam quickly during construction.

[0088] The water-reducing agents used in the following examples are polycarboxylate water-reducing agents, naphthalene-based water-reducing agents, or aliphatic water-reducing agents, preferably F-10 water-reducing agent purchased from BASF. It can extend the activation period of the microcement system. After adding water and stirring, the activation period is greater than 5 hours (after adding water and stirring, there is no clumping after 5 hours, and it can still be used normally); it can improve the strength and density of microcement, reduce the amount of water used in cement, and improve the fluidity of microcement without increasing the amount of water used in mortar.

[0089] The wood fibers used in the following examples are white wood fibers or grayish-white wood fibers, preferably with a length of 200 to 700 mm, and more preferably 500 mm long PWC540CA wood fibers purchased from JRS Company in Germany.

[0090] The principles and features of the present invention are described below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise specified, specific conditions or manufacturer-recommended conditions should be followed in the embodiments. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0091] Example 1

[0092] This embodiment provides a non-blooming dry powder art microcement, comprising the following raw materials in parts by weight:

[0093] 35 parts of 52.5 white silicate cement, 35 parts of 80-mesh quartz sand, 5 parts of 5010N latex powder, 0.4 parts of ME40M cellulose, 0.3 parts of sodium tripolyphosphate dispersant, 0.3 parts of P588 wetting agent, 0.4 parts of P804 defoamer, 0.2 parts of F-10 water-reducing agent, and 0.5 parts of PWC540CA wood fiber.

[0094] It is prepared by the following method:

[0095] Prepare white cement, artistic sand, latex powder, cellulose, dispersant, wetting agent, defoamer, water-reducing agent, and wood fiber according to the formula weight, and set aside;

[0096] In a small dry powder mixer, cellulose and art sand with a mass of 10 times that of cellulose are premixed to obtain premixed cellulose.

[0097] In a small dry powder mixer, the dispersant and 10 times the mass of the art sand are premixed to obtain a premixed dispersant.

[0098] In a small dry powder mixer, the wetting agent and 10 times the mass of the wetting agent art sand are premixed to obtain a premixed wetting agent.

[0099] In a small dry powder mixer, the defoamer and 10 times the mass of the defoamer art sand are premixed to obtain a premixed defoamer.

[0100] In a small dry powder mixer, the water-reducing agent and 10 times the mass of the water-reducing agent art sand are premixed to obtain a premixed water-reducing agent.

[0101] Add the white cement, remaining art sand, adhesive powder, premixed cellulose, premixed dispersant, premixed wetting agent, premixed defoamer, premixed water-reducing agent, and wood fiber in sequence into a mixer equipped with a mixing paddle and a high-speed dispersing blade. The mixing paddle rotates at 200 rpm and the high-speed dispersing blade rotates at 1000 rpm. After mixing for 20 minutes, stop the machine, discharge the bottom 5 wt% of the mixture, return it to the furnace, and continue mixing for 15 minutes.

[0102] Example 2

[0103] This embodiment provides a non-blooming dry powder art microcement, comprising the following raw materials in parts by weight:

[0104] 60 parts of 52.5 white silicate cement, 30 parts of 90-mesh quartz sand, 5 parts of Elaitai FX2350 latex powder, 0.4 parts of ME40M cellulose, 0.3 parts of sodium pyrophosphate dispersant, 0.25 parts of DF80 wetting agent, 0.5 parts of P803 defoamer, 0.3 parts of F-10 water-reducing agent, and 0.6 parts of PWC540CA wood fiber.

[0105] Its preparation method is the same as that in Example 1.

[0106] Example 3

[0107] This embodiment provides a non-blooming dry powder art microcement, comprising the following raw materials in parts by weight:

[0108] 25 parts of 52.5 white silicate cement, 50 parts of 90-mesh quartz sand, 8 parts of Wacker Chemie 5044N latex powder, 0.8 parts of ME40M cellulose, 0.2 parts of sodium hexametaphosphate dispersant, 0.5 parts of DF80 wetting agent, 0.1 parts of P803 defoamer, 0.1 parts of F-10 water-reducing agent, and 1 part of PWC540CA wood fiber.

[0109] Its preparation method is the same as that in Example 1.

[0110] Comparative Example 1

[0111] The difference between this comparative example and Example 1 is that no dispersant was added, resulting in severe blooming of the paint film.

[0112] Comparative Example 2

[0113] The difference between this comparative example and Example 1 is that no adhesive powder is added, resulting in a lower early hardness of the paint film.

[0114] Comparative Example 3

[0115] The difference between this comparative example and Example 1 is that 52.5 cement was replaced with 32.5 cement or white high-alumina cement. The paint film of 32.5 cement did not develop mottled appearance, but its compressive strength was reduced; the paint film of white high-alumina cement showed alkali whitening, and mottled appearance also occurred after color matching.

[0116] Test Case - Metrological Quality Inspection

[0117] The non-blooming dry powder art microcement prepared in Example 1 was sent to the Shenzhen Institute of Metrology and Quality Inspection for performance testing, fire protection testing, and sample quality testing. Specifically:

[0118] The sample, named "Artistic Micro-cement (White Medium Sand)," weighing 1 kg, was from the Product Quality Supervision and Inspection Institute. The sample was described as intact, and the judgment was based on GB 18582-2020, "Limits of Harmful Substances in Building Wall Coatings" (Water-based Wall Coatings and Putty). The test results are shown below. Figure 8 .like Figure 8 As shown, a total of 5 items were tested in this commissioned inspection, and all tested items met the requirements of the standard.

[0119] This includes a fire protection product combustion performance testing center; the sample name is micro-cement (e.g., Figure 10 (As shown), the sample quantity is 12m 2 The testing environment conditions are 20-25℃ and 50-75%RH; the judgment is based on GB8624-2012 "Classification of Combustion Performance of Cooking Materials and Products"; the testing is based on GB / T 14402-2007 "Determination of Combustion Performance and Calorific Value of Building Materials and Products" and GB / T 20284-2006 "Single Combustion Test of Building Materials or Products".

[0120] In GB / T 14402-2007, the sample is ground into powder; in GB / T 20284-2006, the sample is coated onto a substrate, with the substrate closely attached to the backing plate.

[0121] Sample description: Sample areal density 9.2 kg / m³ 2 (Including substrate), sample thickness 6.9mm (including substrate), the sample was ultimately used to coat a cement wall, and during testing it was coated on a calcium silicate substrate board, the sample exposed to fire was the cement surface.

[0122] Test results are as follows Figure 9 As shown, the photos before and after the experiment are as follows. Figure 11 As shown, Figure 11 The photo on the left is the one before the experiment, and the photo on the right is the one after the experiment.

[0123] Test conclusion: such as Figure 9As shown, the sample's combustion performance meets the requirements of GB 8624A(A2) level, with a smoke generation characteristic level of s1 and a combustion drip / particulate level of d0.

[0124] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A dry powder art micro cement that does not bloom, characterized in that, The raw materials include, in parts by weight, white cement 30-40 parts, artistic sand 30-40 parts, latex powder 4-5 parts, cellulose 0.3-0.5 parts, dispersant 0.3-0.4 parts, wetting agent 0.2-0.4 parts, defoaming agent 0.2-0.5 parts, water reducing agent 0.2-0.3 parts, and wood fiber 0.5-0.75 parts; the white cement is white portland cement; The dispersant is a chelating dispersant for metal ions, including organic chelating dispersants and inorganic chelating dispersants; The inorganic chelating dispersant includes at least one of orthophosphate, pyrophosphate, metaphosphate, and polyphosphate; The wetting agent is a non-ionic dry powder wetting agent and / or an anionic dry powder wetting agent, and the latex powder is a copolymer of vinyl acetate and ethylene and / or a styrene and acrylic ester copolymer.

2. The non-flooding dry powder art micacement according to claim 1, characterized in that, The raw materials include, in parts by weight, white cement 35 parts, artistic sand 35 parts, latex powder 5 parts, cellulose 0.4 parts, dispersant 0.3 parts, wetting agent 0.3 parts, defoaming agent 0.4 parts, water reducing agent 0.2 parts, and wood fiber 0.5 parts.

3. The non-flooding dry powder art micro cement according to claim 1, characterized in that, The white portland cement includes at least one of 32.5 white portland cement, 42.5 white portland cement, and 52.5 white portland cement; and the artistic sand is quartz sand or calcium sand.

4. The non-flooding dry powder art micro cement according to claim 1, wherein, The cellulose is hydroxypropyl methylcellulose and / or hydroxyethyl cellulose, and the water reducing agent is at least one of polycarboxylic acid water reducing agent, naphthalene series water reducing agent, and aliphatic water reducing agent.

5. The process for preparing the non-cracking dry powder artistic micro cement according to any one of claims 1 to 4, characterized in that, The method includes the following steps: The cellulose, dispersant, wetting agent, defoaming agent, and water reducing agent are respectively mixed with 10 times the weight of artistic sand to obtain pre-mixed materials; The white cement, remaining artistic sand, latex powder, pre-mixed cellulose, pre-mixed dispersant, pre-mixed wetting agent, pre-mixed defoaming agent, pre-mixed water reducing agent, and wood fiber are sequentially mixed for the first time; After the first mixing, 5wt% of the bottom layer is discharged and then re-mixed for the second time.

6. The process for preparing the non-flooding dry powder artistic micro cement according to claim 5, characterized in that, The instruments for the first and second mixing are mixers with mixing paddles and high-speed dispersing plows, the rotation speed of the mixing paddles is 100-200 rpm, the rotation speed of the high-speed dispersing plows is 800-1000 rpm, and the mixing time for the first and second mixing is 15-20 min.

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