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CN-121975361-A - Micro-cement paint and preparation method thereof

CN121975361ACN 121975361 ACN121975361 ACN 121975361ACN-121975361-A

Abstract

The invention discloses a micro-cement coating, which comprises, by weight, 500-1000 parts of white silicate cement, 50-100 parts of silane coupling agent-silica sol composite modified quartz sand, 400-800 parts of styrene-acrylic emulsion, 1-5 parts of single-layer graphene dispersion liquid, 0.5-3 parts of carboxylated multi-wall carbon nanotubes, 1-5 parts of hydroxypropyl methyl cellulose ether, 1-10 parts of defoaming agent, 1-10 parts of starch ether, 50-100 parts of water, 1-20 parts of alkali-resistant coated mineral pigment, 1-2 parts of air entraining agent, 0.5-1 part of nano calcium carbonate and 0.3-0.5 part of polyacrylamide. The coating disclosed by the invention has the advantages that the synergistic effect is enhanced by controlling raw materials and utilizing the lamellar barrier and network of the carboxylated multiwall carbon nanotube and the single-layer graphene, and a three-dimensional network is constructed by the carboxylated multiwall carbon nanotube and the single-layer graphene, so that the heat conduction, electric conduction and mechanical properties are improved, and the coating is suitable for decoration of building ground walls.

Inventors

  • Wang Wusuo
  • FAN YAOHU
  • WANG HUAN
  • WANG JIANHUA
  • SHI PENGHUI

Assignees

  • 陕西秦汉恒盛新型建材科技有限责任公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (10)

  1. 1. The micro-cement coating is characterized by comprising, by weight, 500-1000 parts of white silicate cement, 50-100 parts of silane coupling agent-silica sol composite modified quartz sand, 400-800 parts of styrene-acrylic emulsion, 1-5 parts of single-layer graphene dispersion liquid, 0.5-3 parts of carboxylated multi-wall carbon nanotubes, 1-5 parts of hydroxypropyl methyl cellulose ether, 1-10 parts of defoaming agent, 1-10 parts of starch ether, 50-100 parts of water, 1-20 parts of alkali-resistant coated mineral pigment, 1-2 parts of air entraining agent, 0.5-1 part of nano calcium carbonate and 0.3-0.5 part of polyacrylamide.
  2. 2. The micro cement paint as claimed in claim 1, wherein the preparation method of the silane coupling agent-silica sol composite modified quartz sand is characterized in that 80-120 mesh quartz sand is ground to 200 mesh, then the quartz sand is soaked in a treatment liquid at 50-65 ℃ and then dried, the treatment liquid is formed by mixing a silane coupling agent KH-550 and silica sol with the mass concentration of 20-40%, and the mass ratio of the silane coupling agent KH-550 to the silica sol is 1:2.5-3.5.
  3. 3. The micro cement paint as claimed in claim 1, wherein the defoaming agent is formed by mixing polyether polymer defoaming glue and acrylic emulsion, and the mass ratio of the polyether polymer defoaming glue to the acrylic emulsion is 1:1.5-2.5.
  4. 4. The micropellet paint of claim 1, wherein the alkali-resistant coated mineral pigment is a silane-coated iron oxide-based toner.
  5. 5. A method for preparing the micro cement paint as claimed in any one of claims 1 to 4, comprising the steps of: Firstly, mixing carboxylated multi-wall carbon nanotubes with styrene-acrylic emulsion, dispersing for 6-10 min at a rotation speed of 1800-2200 r/min, and then adding single-layer graphene dispersion liquid to disperse for 4-6 min at a rotation speed of 1300-1700 r/min to obtain nano-emulsion pre-dispersion liquid; Uniformly mixing silane coupling agent-silica sol composite modified quartz sand and alkali-resistant coated mineral pigment, and then adding hydroxypropyl methyl cellulose ether and starch ether for mixing to obtain a dry powder mixture; Mixing styrene-acrylic emulsion, white silicate cement, water, nano calcium carbonate and polyacrylamide, stirring at a rotation speed of 400-600 r/min for 3min, adding the nano-emulsion pre-dispersion liquid obtained in the step one at a rate of 10-15 g/s, and stirring at a rotation speed of 1300-1700 r/min for 8-12 min to obtain composite slurry; And thirdly, stirring the dry powder mixture obtained in the first step, adding the composite slurry obtained in the second step, sequentially adding an air entraining agent and a defoaming agent to form a semi-finished coating, and screening to obtain the micro-cement coating.
  6. 6. The method for preparing a micro-cement paint according to claim 5, wherein the mass ratio of the carboxylated multi-walled carbon nanotubes to the styrene-acrylic emulsion in the first step is 0.3-1.9:100.
  7. 7. The preparation method of the micro-cement paint according to claim 5, wherein the specific process of preparing the semi-finished paint in the third step is that the dry powder mixture obtained in the first step is stirred at the rotating speed of 250-350 r/min, meanwhile, the composite slurry obtained in the second step is added, then the composite slurry is stirred at the rotating speed of 800-1000 r/min for 15-25 min, the rotating speed is reduced to 250-350 r/min, then the air entraining agent is added, the mixture is stirred for 1.5-2.5 min, and the defoaming agent is added, and the mixture is stirred for 0.5-1.5 min.
  8. 8. The method for preparing a micro cement paint according to claim 5, wherein the viscosity test is performed before the semi-finished paint is screened in the step three, if the viscosity of the semi-finished paint is 3000 mPa-s to 3500 mPa-s, the semi-finished paint is screened, and if the viscosity of the semi-finished paint is more than 3500 mPa-s, the pre-treatment is performed, and the screening is performed.
  9. 9. The method for preparing the micro-cement paint according to claim 8, wherein the pretreatment method is that the temperature of the semi-finished paint is controlled to be 25-30 ℃, the pretreatment is completed if the viscosity of the semi-finished paint is reduced to 3000-3500 mPas, and if the viscosity of the semi-finished paint is still greater than 3500 mPas, water or styrene-acrylic emulsion is added and mixed until the viscosity is 3000-3500 mPas.
  10. 10. The preparation method of the micro cement paint is characterized in that the screening method in the third step is that high-frequency vibration is adopted to enable semi-finished paint to sequentially pass through an 80-mesh filter screen and a 120-mesh filter screen, scraping plates are adopted to assist, screen residues of the 80-mesh filter screen and the 120-mesh filter screen are dispersed at the speed of 2000r/min, then the materials respectively flow back to the corresponding filter screens for screening again, the parameters of the high-frequency vibration are 45-55 Hz, the amplitude is 6-10 mm, and the filter screen is made of one of polyester, polypropylene and polyamide.

Description

Micro-cement paint and preparation method thereof Technical Field The invention belongs to the technical field of building decoration materials, and particularly relates to a micro-cement coating and a preparation method thereof. Background The micro cement is widely applied in the field of building decoration by virtue of the seamless integrated decoration effect, and is especially suitable for the requirement of modern building scenes such as a floor heating system, an intelligent building and the like on 'structure-function integration'. The core short board of the traditional micro-cement has the defects of mechanical property and function, and in order to pursue the decoration, the core short board is mostly compounded by adopting low-strength resin and common aggregate, so that the hardness and strength are low, and the cracking rate in the floor heating environment is more than 30 percent. In order to make up for the short plate, the prior art tries to add graphene and carbon nano tubes to synchronously improve functions and strength, but lacks a scientific dispersing and interface regulating scheme, so that a new problem is caused, namely, nanoparticles are easy to agglomerate (the dispersity D50 is more than or equal to 5 mu m), the bonding force with a cement-resin matrix interface is weak, the performance advantage of the nano material cannot be exerted, stress concentration points can be formed in the matrix, microscopic cracks are easy to generate, the cracking risk is further aggravated, and the performance improvement effect is limited. Meanwhile, in order to solve the problem of poor construction fluidity of micro cement paste, part of products are blindly added with high VOC solvents (the VOC mass content is more than or equal to 50 g/L) or heavy metal-containing pigments, the construction operability is improved in a short period, but the requirements of green building evaluation standards (GB/T50378-2019) on healthy building materials are not met, the cementing structure of a cement matrix is damaged, the cementing structure conflicts with the requirements of improving mechanical properties, the products generally lack of effective water-retaining component design, the water loss rate of the paste is more than or equal to 15 percent/h, and the slurry is easy to sand after construction, so that the vicious circle of environment protection-construction-mechanics is formed. In summary, the prior art fails to solve the key problem of weak bonding between nanomaterial aggregation and interfaces, and the performance improvement directions conflict with each other, so that the comprehensive requirements of high strength, multiple functions, environmental protection and construction adaptability cannot be synchronously realized. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a micro-cement coating. According to the micro-cement coating, raw material components are controlled, carboxylated multi-wall carbon nanotubes and single-layer graphene are introduced, the synergistic effect of lamellar blocking and network enhancement is utilized, the heat conduction, electric conduction and mechanical properties of the coating are synchronously improved, meanwhile, the carboxylated multi-wall carbon nanotubes and styrene-acrylic emulsion can be used for constructing a 'carbon nanotube-polymer' three-dimensional network, the strength and toughness of the coating are further improved, and the problem that the existing micro-cement coating cannot be considered in mechanical strength, functional characteristics, environmental friendliness and construction adaptability is solved. The micro cement coating is characterized by comprising, by weight, 500-1000 parts of white silicate cement, 50-100 parts of silane coupling agent-silica sol composite modified quartz sand, 400-800 parts of styrene-acrylic emulsion, 1-5 parts of single-layer graphene dispersion liquid, 0.5-3 parts of carboxylated multi-wall carbon nanotubes, 1-5 parts of hydroxypropyl methyl cellulose ether, 1-10 parts of defoamer, 1-10 parts of starch ether, 50-100 parts of water, 1-20 parts of alkali-resistant coated mineral pigment, 1-2 parts of air entraining agent, 0.5-1 part of nano calcium carbonate and 0.3-0.5 part of polyacrylamide. According to the invention, a 'one-dimensional tubular-two-dimensional sheet-shaped' complementary combination is formed by adopting nano-material carboxylated multi-wall carbon nano-tubes and single-layer graphene, the surface of the carboxylated multi-wall carbon nano-tubes contains carboxyl groups, and can form hydrogen bond action with hydroxyl groups of styrene-acrylic emulsion, so that dispersed anchoring sites are provided for the carboxylated multi-wall carbon nano-tubes, tubular particle winding agglomeration is avoided; The silane coupling agent-silica sol composite modified quartz sand is combined and introduced, the quartz sand adopts a silane coupling ag