Two-component wall-floor-roof integrated micro cement and preparation method thereof

Abstract

According to the double-component wall-floor-roof integrated micro cement and the preparation method thereof, the double-component wall-floor-roof integrated micro cement comprises a component A and a component B, and the weight ratio of the component A to the component B is (2-5): 1; the component A comprises Portland cement, special cement, sand, a filler, a water reducing agent, cellulose ether, a thixotropic agent, a defoaming agent, silica powder, a retarder and an anti-cracking agent; the component B is prepared from emulsion, nano silica sol, deionized water, a liquid defoaming agent and water-based color paste; the emulsion is a mixture of a water-based styrene / acrylate copolymer emulsion, an aliphatic anion fatty acid modified polyurethane dispersion and a bio-based self-extinction polyurethane dispersion in a ratio of 1: (0.1-1): (0.1-1). The micro cement disclosed by the invention can be directly brushed on a wall surface, a top surface and a ground surface, a seamless decoration effect is realized, the integrity of decoration and the continuous aesthetic feeling of space are ensured, and meanwhile, the micro cement also has high strength and good anti-cracking performance.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a two-component wall, ground and ceiling integrated microcement and a preparation method thereof. Background Art

[0002] Microcement is a new type of wall and floor decorative paint originated in Europe and the United States. It has quickly become popular in interior art decorative paints in recent years. Compared with other interior wall art paints, microcement is simple and industrial in style. Its integrated wall and floor design can create an overall seamless sense of space. At the same time, microcement has the advantages of high hardness in performance. It is mainly composed of silicate cement and polymer emulsion as the main film-forming substances, with the addition of aggregates, pigment fillers and other additives. Microcement requires the use of specific painting tools, through construction processes such as scraping, rolling, spraying, and grinding, and solidified into a film through cement hydration reaction.

[0003] However, the microcement currently on the market has the following problems:

[0004] Compared with building materials such as tiles and marble, microcement is more brittle, making its paint body more fragile. It is easily damaged when scratched or hit by heavy objects, resulting in pits and scratches that are difficult to repair.

[0005] The existing microcement products on the market have poor crack resistance and are prone to self-shrinkage during curing, resulting in imperceptible microcracks inside the microcement, which can lead to problems such as cracking and falling off during later use. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of the microcement mentioned above, and to provide a two-component wall, floor and ceiling integrated microcement and a preparation method thereof. The microcement of the present invention can be directly applied on the wall, ceiling and floor to achieve a seamless decorative effect, ensure the integrity of the decoration and the continuous aesthetic feeling of the space, and at the same time it also has high strength and good anti-cracking performance.

[0007] To solve the above problems, the present invention is implemented through the following technical solutions:

[0008] The first object of the present invention is:

[0009] Provided is a two-component wall, floor and ceiling integrated microcement, comprising component A and component B, wherein the weight ratio of component A to component B is 2 to 5:1;

[0010] Component A includes the following components by weight:

[0011] 30-60 parts of Portland cement, 5-10 parts of special cement, 10-40 parts of sand, 10-40 parts of pigments and fillers, 0.1-3 parts of water reducer, 0.1-2 parts of cellulose ether, 0.1-2 parts of thixotropic agent, 0.1-3 parts of defoaming agent, 1-10 parts of silica powder, 0.1-3 parts of retarder, and 0.1-5 parts of anti-cracking agent;

[0012] The special cement is white sulphoaluminate cement;

[0013] Component B includes the following components by weight:

[0014] 20-50 parts of emulsion, 2-10 parts of nano silica sol, 20-40 parts of deionized water, 0.05-1 part of liquid defoamer, 0-10 parts of water-based color paste;

[0015] The emulsion is a mixture of water-based styrene / acrylate copolymer emulsion, aliphatic anionic fatty acid modified polyurethane dispersion and bio-based self-matting polyurethane dispersion, and the ratio of the three is 1:0.1-1:0.1-1.

[0016] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0017] The aqueous styrene / acrylate copolymer emulsion:

[0018] Contains no APEO, no ammonia, no formaldehyde;

[0019] Solid content 47-49%, pH value 7-8.5, viscosity 10-100mPa·s, glass transition temperature -5℃.

[0020] The raw materials of water-based styrene / acrylate copolymer emulsion have low odor, do not contain formaldehyde and ammonia, and will not release ammonia when mixed with strong alkaline materials such as cement. It achieves low odor and is green and environmentally friendly. The non-ionic system is not easily affected by the high alkalinity of cement; in strong alkaline systems such as cement-based systems, the emulsion will not break or stratify, and the emulsion properties remain stable. In addition, the surfactant in the emulsion has good dispersibility for cement and low water demand, which allows a large reduction in water consumption while ensuring product performance, maintaining or even improving flexural strength; water-based styrene / acrylate copolymer emulsion has high water resistance and a high glass transition temperature; it greatly improves wear resistance and adhesion.

[0021] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0022] The aliphatic anionic fatty acid modified polyurethane dispersion:

[0023] Solid content 33.5-35.5%, pH value 7-9, viscosity ≤250mPa·s, average particle size 50-70μm, density 1.0-1.05g / ml.

[0024] Preferably, Covestro's UH2593 / 1 aliphatic anionic fatty acid modified polyurethane dispersion is used.

[0025] Aliphatic anionic fatty acid modified polyurethane dispersion is a waterborne polyurethane dispersion with high chemical crosslinking and excellent durability.

[0026] 1. Fatty acid modification: Fatty acid modification enhances flexibility and toughness while retaining the high durability of polyurethane dispersions.

[0027] 2. Anionic stability: Stable dispersion performance in aqueous environment is achieved through carboxyl or sulfonate groups.

[0028] 3. Curing potential: Contains potential reactive groups (such as hydroxyl or amine groups), which cross-link with other chemical components to form a film. It has excellent yellowing resistance (aliphatic structure); high chemical resistance and mechanical strength; excellent film-forming properties and transparency. Its film formation depends on physical cross-linking and self-cross-linking reactions. Physical cross-linking: water evaporation and particle aggregation; after coating, water gradually evaporates, the particles of the polyurethane dispersion begin to contact, deform and finally aggregate into a film, and the particles are mainly physically cross-linked through intermolecular forces (such as hydrogen bonds and van der Waals forces); anionic groups repel each other during the film-forming process to ensure uniform distribution of particles and reduce film defects; self-cross-linking reaction: the fatty acid modified part of the system introduces hydroxyl or double bond functional groups, and the hydroxyl and carboxyl groups form ester bonds. The double bond initiates polymerization through free radicals. Thus, self-reaction achieves cross-linking.

[0029] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0030] The bio-based self-matting polyurethane dispersion:

[0031] Solid content 34-36%, pH value 7.4-8.4, viscosity 200-600 mPa·s, density 1.0-1.05 g / ml, bio-based content 35% (ASTM D6866 C14 test method). The bio-based self-matting polyurethane dispersion has low VOC, excellent self-matting performance, and can provide a glossy and smooth film layer without using an additional matting agent.

[0032] Decovery sp 2022 bio-based self-matting polyurethane dispersion from Covestro is preferred.

[0033] Bio-based self-matting polyurethane dispersion is a water-based polyurethane dispersion that does not contain free isocyanate groups, so its reaction mechanism is different from that of traditional isocyanate-based polyurethane systems. Its reaction mechanism is mainly based on the following two core processes:

[0034] (1) Physical film formation and water evaporation: After the bio-based self-matting polyurethane dispersion is coated, the water content in the dispersion is gradually reduced through water evaporation. As the water evaporates, the polyurethane particles in the dispersion gradually gather and contact, and the molecular chains begin to physically crosslink and fuse. After the water evaporates, the polyurethane molecular chains move with each other, microscopic diffusion and entanglement occur on the surface, and the particles gradually contact and compact with each other, eventually forming a continuous coating film. The film formation process relies on the free movement and entanglement of the polyurethane molecular chains to achieve film formation. When the coating with self-matting properties dries on the surface and forms a film layer, the microstructure on the surface of the polyurethane particles can effectively scatter light, giving the coating a low gloss or matte effect without the need for additional matting agents.

[0035] (2) Self-crosslinking and intramolecular interaction: The dispersion contains self-crosslinking groups or functional groups (such as hydroxyl groups, carboxyl groups, etc.). After film formation, these groups interact with each other through polymer chains to enhance the mechanical strength and weather resistance of the film layer.

[0036] Internal molecular chain crosslinking: During the film formation process, the polyurethane molecular chains may be crosslinked through physical effects (such as hydrogen bonds, van der Waals forces, etc.) to enhance the overall structure of the film. At the same time, the hydrophilic or hydrophobic groups in the polyurethane chain may self-assemble or self-crosslink. This crosslinking improves the chemical resistance, water resistance and adhesion of the coating, ensuring the stability of the coating under various environmental conditions.

[0037] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0038] The nano silica sol is a translucent liquid with a solid content of 28.3-31.5%; a viscosity CPS of less than 10 at 25° C.; and a particle size of less than 50 nm.

[0039] The nano silica sol used has high purity and high stability, which ensures its excellent performance in high-precision and high-demand applications. Its particle size is less than 50 nanometers and is evenly distributed, which effectively promotes the nucleation reaction and thus improves the early strength. In addition, nano silica sol also has high dispersibility and transparency, is easy to disperse in water, and has high transparency, and has no effect on color matching.

[0040] The special cement is a white sulphoaluminate cement, preferably Ys white sulphoaluminate cement produced by Jiangxi Yinshan New Materials Co., Ltd. The main components are Ca 4 (Al 6 O 12 )(SO4 )、(2CaO·SiO 2 and CaSO 4 ; The reaction system mainly produces high-sulfur calcium sulfoaluminate hydrate (C3A·3C·H32, abbreviated as AFt), low-sulfur sulfoaluminate hydrate (C3A·C·H12 abbreviated as AFm), and aluminum hydroxide gel (AH3), which give the characteristics of rapid reaction and early strength; when the gypsum content is insufficient, a certain amount of ettringite can still be generated, which is mainly because the monosulfur calcium sulfoaluminate hydrate exists in the form of AFm-OH (C4AH13), so that CaSO 4 It can participate in the reaction to form ettringite, which can better resist cracking and compensate for shrinkage; it has high whiteness, ≥90%, and is easy to adjust the color;

[0041] The corresponding reaction equation is as follows:

[0042] (1)2Ca 4 (Al 6 O 12 )(SO 4 )+2CaSO 4 +38H 2 O→3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O(AFt)+3CaO·Al 2 O 3 ·CaSO 4 12H 2 O(AFm)+4Al(OH) 3 ;

[0043] (2) 4CaO·Al 2 O 3 ·CaSO 4 13H 2 O+2CaSO 4 +19H 2 O+OH － →3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O(AFt)+Ca(OH) 2 ;

[0044] (3)2(3CaO·SiO 2 )+6H 2 O→3CaO·2SiO 2 ·3H 2 O+3Ca(OH) 2 ;

[0045] (4)2(2CaO·SiO 2 )+4H 2 O→3CaO·2SiO 2 ·3H 2 O+Ca(OH) 2 .

[0046] In the present invention, the synergistic effect of water-based styrene / acrylate copolymer, nano-silica sol, white sulphoaluminate cement, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion is mainly reflected in the following aspects:

[0047] (1) Interface compatibility and enhancement

[0048] The mixture of water-based styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion reacts chemically with cement hydration products (such as CSH gel and calcium hydroxide) through its polar groups (such as carboxyl and hydroxyl groups), thereby improving the interfacial adhesion between the emulsion and cement and enhancing the tensile bonding strength of microcement. These chemical reactions improve the durability of microcement and avoid delamination or cracking caused by incompatibility between the emulsion and cement.

[0049] (2) Microstructure optimization

[0050] The mixture of waterborne styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion fills micropores or voids during cement hydration and forms an elastic network after hardening, further improving the density and toughness of microcement. This improves crack resistance, especially in thin layer construction, reducing cracking and peeling problems on the surface of microcement. By adjusting the ratio of emulsion to cement, a uniform microscopic distribution is formed, so that the emulsion plays a reinforcing role in the cement matrix without hindering the hydration reaction of cement. The addition of nano-silica sol can further enhance the compactness of the microstructure under the combined action of waterborne styrene / acrylate copolymer emulsion and cement.

[0051] (3) Improve rheological properties

[0052] The dispersant component in the mixture of water-based styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion can reduce the aggregation of cement particles, improve the dispersibility and construction fluidity of the slurry, and thus improve the construction performance. This improves the construction performance of microcement, especially the smoothness of operation when brushing or scraping, and reduces the problems of bubbles and uneven thickness during construction.

[0053] (4) Enhanced water resistance and protective performance

[0054] The hydrophobic groups in the mixture of waterborne styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion combine with the pore structure in the cement to significantly reduce the water absorption of microcement and enhance its waterproof performance. This improves the water resistance and chemical corrosion resistance of microcement, making it particularly suitable for humid or corrosion-prone environments and extending the service life of the microcement finishing layer.

[0055] (5) Control curing time and construction adaptability

[0056] The film-forming process in the mixed material of water-based styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion is carried out synchronously with the hydration process of cement. By adjusting the volatilization rate and film-forming properties of the emulsion, the curing time of microcement can be accurately controlled, the construction adaptability can be improved, the operation time can be extended, the construction difficulties caused by too fast curing can be reduced, and the problems of surface whitening and peeling caused by too fast volatilization of the emulsion can be avoided.

[0057] (6) Improve flexibility and wear resistance

[0058] A mixture of water-based styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion forms an elastic network that can resist the propagation of microcracks, while the hard structure of the cement matrix provides sufficient wear resistance, and the two complement each other. This improves the impact resistance and flexibility of microcement, making it particularly suitable for use in areas with high traffic loads. The polyurethane-acrylic emulsion composite system is selected to achieve optimal performance by utilizing the flexibility of polyurethane and the hardness of acrylic.

[0059] (7) Color uniformity and finishing effect

[0060] A mixture of water-based styrene / acrylate copolymer emulsion, bio-based self-matting polyurethane dispersion and aliphatic anionic fatty acid modified polyurethane dispersion has a coating and dispersion effect on the pigment particles of cement, which can improve the color uniformity of microcement and prevent color difference problems. This reduces the blooming and whitening of the finishing layer, provides a more stable color performance, and is suitable for scenes with high decorative requirements.

[0061] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0062] The A component includes one or a combination of the following features:

[0063] The silicate cement is P.O42.5 or P.O52.5 ordinary silicate cement;

[0064] The special cement is white sulphoaluminate cement produced by Jiangxi Yinshan New Materials Co., Ltd.; and / or

[0065] The white sulphoaluminate cement has the following physical properties: density 2.5-3.0 g / cm 3 , specific surface area 400~500m 2 / kg, Hunter whiteness 90-95, pH value 9-11, initial setting time 20-30 minutes, final setting time 30-40 minutes, strength grade P.O62.5;

[0066] The sand is one or a combination of 40-70 mesh crystal white sand and 70-140 mesh crystal white sand; using crystal white sand of different meshes can make the decorative material layer form a smooth and delicate or rough texture effect;

[0067] The color filler is one or a combination of kaolin, talcum powder, and titanium dioxide; by adding talcum powder and titanium dioxide, the covering power of the decorative material of the present invention can be improved, and titanium dioxide can also give the cement layer various colors to meet different consumer needs; by adding kaolin, the feel of component A mixed with component B can be increased, so that the two-component wall, floor and ceiling integrated micro-cement of the present invention is easy to construct before painting, and the operability is improved;

[0068] The water reducing agent is a polycarboxylic acid high performance water reducing agent;

[0069] The cellulose ether is one or a combination of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and carboxymethyl cellulose;

[0070] The thixotropic agent is one of the activated layered silicates;

[0071] The defoamer is one or a combination of organic silicon powder defoamers;

[0072] The retarder is one or a combination of aminotrimethylene phosphoric acid, tartaric acid, and sodium gluconate;

[0073] The anti-cracking agent is a calcium oxide-calcium sulphoaluminate composite concrete expansion agent;

[0074] The silicon micropowder is crystalline silicon micropowder, which has the characteristics of high whiteness, high hardness, high purity, ultrafineness, high weather resistance and acid and alkali resistance.

[0075] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0076] The B component includes one or a combination of the following features:

[0077] The liquid defoamer is one or a combination of siloxane defoamers, mineral oil defoamers, polyether defoamers, and organosilicon-polyether defoamers; the liquid defoamer can reduce the generation of bubbles during the use of microcement and reduce factors affecting work efficiency. In particular, the organosilicon-polyether defoamer used has both the properties of organosilicon and polyether, and thus has a lower surface tension, so that the defoamer can be dispersed and spread on the surface of the cement layer faster, giving it a faster defoaming ability and a more lasting anti-foaming performance.

[0078] The water-based color paste is at least one of carbon black paste, titanium white paste, iron red, green paste, cyan blue paste and yellow paste.

[0079] The further optimization of the two-component wall, floor and ceiling integrated microcement of the present invention is as follows:

[0080] The coating layer thickness of the two-component wall, floor and ceiling integrated microcement is ≤2mm.

[0081] The second object of the present invention is:

[0082] A method for preparing the above-mentioned two-component wall-floor-cement integrated microcement is provided, which comprises the following preparation steps:

[0083] Preparation of component A:

[0084] Add the silicate cement, special cement, sand and pigment filler into a container in proportion and mix; then add water reducing agent, cellulose ether, thixotropic agent, defoaming agent, silicon micropowder, retarder and anti-cracking agent; increase the stirring speed, stir evenly, and prepare component A;

[0085] Preparation of component B:

[0086] The deionized water, nano silica sol, emulsion, liquid defoamer and water-based color paste are mixed in proportion, and stirred at high speed until dispersed evenly to obtain component B;

[0087] Before construction, mix component A and component B evenly according to the mass ratio to make slurry to obtain two-component wall, floor and ceiling integrated microcement.

[0088] The two-component wall-floor-cement integrated microcement prepared by the present invention has the advantages of high hardness, wear resistance, crack resistance, fire resistance and ultra-low VOC. It adopts coating tools, and is subjected to construction processes such as scraping, rolling, spraying, and grinding, and is cured into a film through cement hydration reaction. The integrated wall-floor style can create a space that is more integrated and seamless.

[0089] The two-component wall, floor and ceiling integrated microcement prepared by the present invention can be directly applied to the wall, floor, ceiling or other decorative panels. There is no need to consider the joint problem when using it. It can achieve integrated seamless construction of the wall, floor and ceiling, maximize the extension of the space design, and create a continuous, flowing and integrated space vision.

[0090] The two-component wall, floor and ceiling integrated microcement prepared by the present invention has excellent fire resistance, wear resistance and weather resistance, and has better compressive and flexural strength and ultra-high workability, and is particularly suitable for application in some renovation and repair projects.

[0091] The two-component wall, floor and ceiling integrated microcement prepared by the present invention is green and environmentally friendly. The organic matter used is all water-based emulsions or water-based resins, with ultra-low VOC content, and its harmful substance content is far lower than the GB18582-2020 "Limits of Harmful Substances in Building Wall Paints" standard.

[0092] Another notable feature of the two-component wall, floor and ceiling integrated microcement prepared by the present invention is that it has a thin thickness. When the coating layer thickness is ≤2 mm, the microcement can achieve better mechanical properties, thereby making the microcement have lower use costs and better performance. Compared with the microcement in the prior art, it can have better use effects while using a smaller amount, avoiding waste of resources and being more environmentally friendly and energy-saving.

[0093] The two-component wall, floor and ceiling integrated microcement prepared by the present invention can be applied to any hard surface. It can be applied not only to putty walls, gypsum board walls, adobe walls, tile walls, cement walls, mortar walls or ceilings, but also to concrete floors and terrazzo floors. This application can improve the hardness and wear resistance of walls and floors.

[0094] The present invention optimizes the weight ratio of each raw material in the two-component wall, floor and ceiling integrated microcement, so that each raw material within the specified usage range can play a role more effectively, effectively reducing the shrinkage rate during the microcement curing process and improving its anti-cracking performance. Therefore, the microcement layer prepared by the present invention not only has better compressive and flexural strength, but also excels in waterproof, oil-proof, anti-skid, fire-proof, wear-resistant and weather-resistant properties. In addition, microcement has super high workability and can be well integrated with different decorative materials without mutual exclusion, and is particularly suitable for renovation and repair projects. In addition, the microcement also has the advantage of ultra-thin use thickness. The coating layer thickness is between 0.5 and 2 mm, which can achieve the better mechanical properties of the microcement layer. DETAILED DESCRIPTION

[0095] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention. All simple improvements to the preparation method of the present invention under the premise of the present invention's conception belong to the protection scope of the present invention.

[0096] Table 1 shows the sources of the raw materials used in the following examples.

[0097] Table 1

[0098]

[0099]

[0100] Example 1

[0101] A method for preparing a two-component wall, floor and ceiling integrated microcement, comprising component A and component B, wherein the weight ratio of component A to component B is 3:1;

[0102] Component A includes the following components by weight:

[0103] 30-60 parts of silicate cement, 5-10 parts of special cement, 10-40 parts of sand, 10-40 parts of pigments and fillers, 0.1-3 parts of water reducer, 0.1-2 parts of cellulose ether, 0.1-2 parts of thixotropic agent, 0.1-3 parts of defoaming agent, 1-10 parts of silicon micropowder, 0.1-3 parts of retarder, 0.1-5 parts of anti-cracking agent; (For the specific amount of relevant raw materials, see Table 2)

[0104] The special cement is white sulphoaluminate cement;

[0105] Component B includes the following components by weight:

[0106] 20-50 parts of emulsion, 2-10 parts of nano silica sol, 20-40 parts of deionized water, 0.05-1 part of liquid defoamer, 0-10 parts of water-based color paste; (For the specific amount of relevant raw materials, please refer to Table 2, the same below)

[0107] The emulsion is a mixture of an aqueous styrene / acrylate copolymer emulsion, an aliphatic anionic fatty acid modified polyurethane dispersion and a bio-based self-matting polyurethane dispersion, the ratio of the three being 1:0.1-1:0.1-1;

[0108] The aqueous styrene / acrylate copolymer emulsion:

[0109] Contains no APEO, no ammonia, no formaldehyde;

[0110] Solid content 47-49%, pH value 7-8.5, viscosity 10-100mPa·s, glass transition temperature -5℃.

[0111] The aliphatic anionic fatty acid modified polyurethane dispersion:

[0112] Solid content 33.5-35.5%, pH value 7-9, viscosity ≤250mPa·s, average particle size 50-70μm, density 1.0-1.05g / ml.

[0113] The bio-based self-matting polyurethane dispersion:

[0114] Solid content 34-36%, pH value 7.4-8.4, viscosity 200-600mPa·s, density 1.0-1.05g / ml, bio-based content 35% (ASTM D6866 C14 test method).

[0115] The nano silica sol is a translucent liquid with a solid content of 28.3-31.5%; a viscosity CPS of less than 10 at 25° C.; and a particle size of less than 50 nm.

[0116] The preparation method of the two-component wall, floor and ceiling integrated microcement comprises the following preparation steps:

[0117] Preparation of component A:

[0118] Add the silicate cement, special cement, sand and pigment filler into a container in proportion and mix; then add water reducing agent, cellulose ether, thixotropic agent, defoaming agent, silicon micropowder, retarder and anti-cracking agent; increase the stirring speed, stir evenly, and prepare component A;

[0119] Preparation of component B:

[0120] The deionized water, nano silica sol, emulsion, liquid defoamer and water-based color paste are mixed in proportion, and stirred at high speed until dispersed evenly to obtain component B;

[0121] Before construction, mix component A and component B evenly according to the mass ratio to make slurry to obtain two-component wall, floor and ceiling integrated microcement.

[0122] Among the A components:

[0123] The silicate cement is P.O52.5 ordinary silicate cement;

[0124] The sand is a combination of 40-70 mesh crystal white sand and 70-140 mesh crystal white sand;

[0125] The water reducing agent is a polycarboxylic acid high performance water reducing agent;

[0126] The cellulose ether is hydroxyethyl cellulose;

[0127] The thixotropic agent is one of the activated layered silicates;

[0128] The defoamer is a kind of organosilicon powder defoamer;

[0129] The retarder is aminotrimethylene phosphoric acid;

[0130] The anti-cracking agent is a calcium oxide-calcium sulphoaluminate composite concrete expansion agent;

[0131] The silicon micropowder is crystalline silicon micropowder, which has the characteristics of high whiteness, high hardness, high purity, ultrafineness, high weather resistance and acid and alkali resistance.

[0132] Among the B components:

[0133] The liquid defoamer is a combination of silicone defoamers;

[0134] The thickness of a single coating layer of the two-component wall, floor and ceiling integrated microcement is ≤1 mm.

[0135] The relevant preparation details in the above preparation method are detailed in the relevant part of the specification.

[0136] The preparation methods of Comparative Examples 1 to 3 are consistent with those of Example 1, and the main difference lies in the specific amounts of raw materials used. The specific raw materials and amounts of Example 1 and Comparative Examples 1 to 3 are detailed in Table 2.

[0137] Comparative Example 4 is a commercially available two-component microcement.

[0138] Table 2 Raw material composition of Examples and Comparative Examples (parts by weight)

[0139]

[0140] Table 3 Test results of embodiments and comparative examples

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147] It can be seen from Table 3 that, with reference to the test results of Q310115000140C095-2022 ground microcement enterprise standard, it can be seen that the two-component wall, floor and ceiling integrated microcement prepared by the present invention has reached enterprise and national standards in many aspects such as compressive and flexural strength, wear resistance, chemical resistance, and harmful substances.

[0148] According to the test results of GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products", it can be seen that the two-component wall, floor and ceiling integrated microcement prepared by the present invention meets the requirements of A (A2) grade paving materials and is an A-grade fireproof building decoration material.

[0149] According to the test results of GB / T 9779-2015 "Multi-layer Architectural Coatings", it can be seen that the physical properties of the two-component wall, floor and ceiling integrated microcement prepared by the present invention meet the technical indicators of type II thick paste type of interior wall multi-layer architectural coatings specified in GB / T 9779-2015.

[0150] According to the test results of GB / T 9779-2015 "Multi-layer Architectural Coatings", it can be seen that the two-component wall, floor and ceiling integrated microcement prepared by the present invention has a harmful substance limit that meets the interior wall coating index specified in GB 18582-2020.

[0151] The full name of the French A+ standard is NF EN 16516:2017, which is an indoor air quality evaluation standard used to measure the impact of building materials and household products (such as paint, flooring, furniture, etc.) on indoor air quality.

[0152] NF EN 16516:2017- "Test Method for Indoor Air Quality Evaluation of Volatile Organic Compounds (VOCs) Emissions from Building Products and Surface Treatment Materials"Purpose: Through this standard test, the release of volatile organic compounds (VOCs) and other harmful substances in building and interior decoration materials is evaluated. This standard aims to ensure indoor air quality and reduce the impact on human health.

[0153] A+ standard: A+ represents the highest evaluation level, indicating that the VOCs emission of the product is very low, has almost no impact on indoor air quality, and meets health requirements. The standard is divided into three levels from A to C, among which A+ is the best.

[0154] According to the NF EN 16516:2017 standard, the test is usually carried out in a sealed test chamber to measure the concentration of volatile organic compounds released by the material at room temperature over different time periods (for example, 28 days). Depending on the amount of release, the product will be assigned different ratings: A, A+, B, C, with A+ being the most environmentally friendly and safest grade.

[0155] In particular, the two-component wall, floor and ceiling integrated microcement prepared by the present invention meets the French A+ standard and is a very environmentally friendly and healthy paint suitable for indoor use.

[0156] Comparative Example 1: The components without the addition of nano-silica sol have low compressive and flexural strengths and are unqualified.

[0157] Comparative Example 2: Without adding special cement, its compressive flexural strength and tensile strength were significantly reduced and failed.

[0158] Comparative Example 3: A conventional emulsion was selected, and its compressive and flexural strength, initial crack resistance and water absorption were all unqualified. This shows that the adaptability of the emulsion is also very important.

[0159] In addition, compared with the commercially available products, that is, comparative example 4, it also fails to meet all the performance requirements of Q310115000140C095-2022 ground microcement enterprise standard and GB / T22374-2018 "Floor coating materials". In particular, the indicators such as crack resistance, compression resistance and flexural resistance cannot be passed. From the perspective of combustion performance, the competing products cannot pass Class A. Obviously, the two-component wall, floor and ceiling integrated microcement prepared by the present invention has obvious advantages over the commercially available comparative examples and competing products.

[0160] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0161] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0163] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0164] Unless otherwise indicated, percentages and parts are by weight.

[0165] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0166] Unless otherwise specified, various raw materials, reagents and components used in the present invention are corresponding raw materials commonly used in the art.

[0167] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A two-component wall, floor and ceiling integrated microcement, characterized by: It comprises component A and component B, and the weight ratio of component A to component B is 2-5:1; Component A includes the following components by weight: 30-60 parts of Portland cement, 5-10 parts of special cement, 10-40 parts of sand, 10-40 parts of pigments and fillers, 0.1-3 parts of water reducer, 0.1-2 parts of cellulose ether, 0.1-2 parts of thixotropic agent, 0.1-3 parts of defoaming agent, 1-10 parts of silica powder, 0.1-3 parts of retarder, and 0.1-5 parts of anti-cracking agent; The special cement is white sulphoaluminate cement; Component B includes the following components by weight: 20-50 parts of emulsion, 2-10 parts of nano silica sol, 20-40 parts of deionized water, 0.05-1 part of liquid defoamer, 0-10 parts of water-based color paste; The emulsion is a mixture of water-based styrene / acrylate copolymer emulsion, aliphatic anionic fatty acid modified polyurethane dispersion and bio-based self-matting polyurethane dispersion, and the ratio of the three is 1:0.1-1:0.1-1.

2. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The aqueous styrene / acrylate copolymer emulsion: Contains no APEO, no ammonia, no formaldehyde; Solid content 47-49%, pH value 7-8.5, viscosity 10-100mPa·s, glass transition temperature -5℃.

3. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The aliphatic anionic fatty acid modified polyurethane dispersion: Solid content 33.5-35.5%, pH value 7-9, viscosity ≤250mPa·s, average particle size 50-70μm, density 1.0-1.05g / ml.

4. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The bio-based self-matting polyurethane dispersion: Solid content 34-36%, pH value 7.4-8.4, viscosity 200-600mPa·s, density 1.0-1.05g / ml, bio-based content 35%.

5. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The nano silica sol is a translucent liquid with a solid content of 28.3-31.5%; a viscosity CPS of less than 10 at 25° C.; and a particle size of less than 50 nm.

6. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The A component includes one or a combination of the following features: The silicate cement is P.O42.5 or P.O52.5 ordinary silicate cement; The special cement is white sulphoaluminate cement produced by Jiangxi Yinshan New Materials Co., Ltd.; and / or The white sulphoaluminate cement has the following physical properties: density 2.5-3.0 g / cm 3 , specific surface area 400~500m 2 / kg, Hunter whiteness 90-95, pH value 9-11, initial setting time 20-30 minutes, final setting time 30-40 minutes, strength grade P.O62.5; The sand is one or a combination of 40-70 mesh crystal white sand and 70-140 mesh crystal white sand; The pigment filler is one or a combination of kaolin, talcum powder and titanium dioxide; The water reducing agent is a polycarboxylic acid high performance water reducing agent; The cellulose ether is one or a combination of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and carboxymethyl cellulose; The thixotropic agent is one of the activated layered silicates; The defoamer is one or a combination of organic silicon powder defoamers; The retarder is one or a combination of aminotrimethylene phosphoric acid, tartaric acid, and sodium gluconate; The anti-cracking agent is a calcium oxide-calcium sulphoaluminate composite concrete expansion agent; The silicon micropowder is crystalline silicon micropowder.

7. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The B component includes one or a combination of the following features: The liquid defoamer is one or a combination of silicone defoamers, mineral oil defoamers, polyether defoamers, and silicone-polyether defoamers; The water-based color paste is at least one of carbon black paste, titanium white paste, iron red, green paste, cyan blue paste and yellow paste.

8. The two-component wall, floor and ceiling integrated microcement according to claim 1, characterized in that: The coating layer thickness of the two-component wall, floor and ceiling integrated microcement is ≤2mm.

9. A method for preparing the two-component wall-floor-cement integrated microcement according to claim 1, characterized in that: It comprises the following preparation steps: Preparation of component A: Add the silicate cement, special cement, sand and pigment filler into a container in proportion and mix; then add water reducing agent, cellulose ether, thixotropic agent, defoaming agent, silicon micropowder, retarder and anti-cracking agent; increase the stirring speed, stir evenly, and prepare component A; Preparation of component B: The deionized water, nano silica sol, emulsion, liquid defoamer and water-based color paste are mixed in proportion, and stirred at high speed until dispersed evenly to obtain component B; Before construction, mix component A and component B evenly according to the mass ratio to make slurry to obtain two-component wall, floor and ceiling integrated microcement.

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