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CN-122011859-A - Coating for external wall insulation and preparation method thereof

CN122011859ACN 122011859 ACN122011859 ACN 122011859ACN-122011859-A

Abstract

The invention relates to the technical field of building energy-saving materials, and discloses a coating for external wall heat preservation and a preparation method thereof. The coating for external wall insulation comprises a base layer bonding layer, a core insulation layer and a surface protection layer, wherein the base layer bonding layer, the core insulation layer and the surface protection layer are sequentially overlapped, and the preparation method of the coating comprises the following steps of S1, preparing modified vitrified micro bubbles, S2, preparing base layer bonding layer slurry, S3, preparing core insulation layer slurry, S4, preparing surface protection layer slurry, S5, coating forming, and S6, detecting a finished product. By adopting the technical scheme of preparing modified vitrified microbeads and stirring and cooperating each layer of slurry in stages, the technical effects of improving the raw material compatibility, optimizing the internal structure of the coating and enhancing the comprehensive performance of the coating are achieved, and the problems of uneven raw material mixing, easy caking and layering of the coating and poor structural stability are solved.

Inventors

  • LI RUILIN

Assignees

  • 贵州诺斯德建筑材料有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The coating for external wall insulation is characterized by comprising a base layer bonding layer, a core insulation layer and a surface protection layer, wherein the base layer bonding layer, the core insulation layer and the surface protection layer are sequentially overlapped; the core heat-insulating layer comprises, by weight, 15-25 parts of modified vitrified microbeads, 20-30 parts of aqueous acrylic emulsion, 8-15 parts of expanded perlite, 3-8 parts of basalt short fibers, 1-3 parts of silane coupling agents, 0.5-2 parts of thickening agents, 0.3-1 part of defoaming agents, 1-2 parts of antifreezing agents and 15-25 parts of deionized water.
  2. 2. The coating for external wall insulation according to claim 1, wherein the base adhesive layer comprises the following raw materials, by weight, 30-40 parts of Portland cement, 10-15 parts of acrylic resin, 15-20 parts of quartz sand, 0.5-1.5 parts of a silane coupling agent and 10-15 parts of deionized water; the surface protective layer comprises the following raw materials, by weight, 15-25 parts of fluorocarbon emulsion, 5-10 parts of titanium dioxide, 3-6 parts of talcum powder, 0.5-1.5 parts of ultraviolet resistance agent, 1-2 parts of film forming agent and 10-20 parts of deionized water.
  3. 3. The coating for external wall insulation according to claim 1, wherein the mass ratio of the modified vitrified micro bubbles to the expanded perlite in the core insulation layer is 1.5-2.5:1.
  4. 4. The coating for external wall insulation according to claim 2, wherein the basalt short fiber has a short cut length of 1-5mm and is pretreated by a silane coupling agent KH560, the thickener is hydroxypropyl methylcellulose, the defoamer is an organosilicon defoamer, the antifreeze is glycol, and the film forming agent is polyethylene glycol.
  5. 5. The coating for external wall insulation according to claim 2, wherein the quartz sand is formed by mixing 20-30 meshes and 40-60 meshes according to a mass ratio of 1:2-3, and is dried at 60-80 ℃ until the water content is less than or equal to 5%, the titanium dioxide is rutile type titanium dioxide, and the particle size of talcum powder is 100-120 meshes.
  6. 6. The preparation method of the coating for the external wall insulation is characterized by comprising the following steps of: s1, preparing modified vitrified micro bubbles, namely drying the vitrified micro bubbles, immersing the vitrified micro bubbles in a modified liquid prepared from aqueous acrylic emulsion, deionized water and gamma-methacryloxypropyl trimethoxy silane, and drying the vitrified micro bubbles again after the immersion is finished to obtain the modified vitrified micro bubbles; S2, preparing a base layer bonding layer slurry, namely mixing and stirring silicate cement, acrylic resin, quartz sand, a silane coupling agent and deionized water, and then adding other raw materials to continuously stir to obtain the base layer bonding layer slurry; S3, preparing core insulating layer slurry, namely mixing and stirring the modified vitrified microbeads, the expanded perlite and the basalt short fibers prepared in the step S1, the aqueous acrylic emulsion, the expanded perlite, the basalt short fibers, the silane coupling agent, the thickener, the defoamer, the antifreezing agent and the deionized water, and then sequentially adding the aqueous acrylic emulsion, the silane coupling agent and the residual raw materials, and stirring in stages to obtain the core insulating layer slurry; S4, preparing surface protection layer slurry, namely taking fluorocarbon emulsion, titanium dioxide, talcum powder, an ultraviolet resistance agent, a film forming agent and deionized water, firstly mixing and stirring the titanium dioxide and the talcum powder, and then adding other raw materials for continuous stirring to obtain the surface protection layer slurry; s5, coating forming, namely cleaning and polishing the building outer wall base layer, sequentially constructing the slurry prepared in the steps S2-S4 in layers, naturally curing after each layer of construction is completed, and obtaining the coating for outer wall heat preservation after all construction and curing are completed; And S6, detecting the finished product, namely detecting the performance of the external wall heat-insulating coating formed in the step S5, wherein the finished product is obtained after the detection is qualified, and if the detection is unqualified, returning to the corresponding preparation step to prepare again, and detecting again after the preparation is performed again.
  7. 7. The method for preparing the coating for external wall insulation according to claim 6, wherein in the step S1, the baking temperature of the vitrified microbeads is 105-110 ℃, and the vitrified microbeads are soaked after being baked to constant weight and cooled to room temperature; the soaking time of the modifying liquid is 2-4h, the drying temperature after the soaking is 80-90 ℃ and the drying time is 1-2h; the mass ratio of the vitrified microbeads to the aqueous acrylic emulsion to the deionized water to the gamma-methacryloxypropyl trimethoxy silane is 1:0.4-0.6:0.4-0.6:0.005-0.01.
  8. 8. The method for preparing the coating for external wall insulation according to claim 6, wherein in the step S2, quartz sand is required to be dried in advance at 60-80 ℃ until the water content is less than or equal to 5%; The stirring is divided into two stages, wherein the first stage is low-speed stirring with the rotating speed of 300-500r/min and the stirring time of 10-15min, and the second stage is high-speed stirring with the rotating speed of 800-1000r/min and the stirring time of 20-30min; In the step S3, basalt short fibers are pretreated by a silane coupling agent KH560 in advance; the stirring is divided into three stages, wherein the first stage is low-speed stirring with the rotating speed of 300-400r/min and the stirring time of 5-10min, the second stage is medium-speed stirring with the rotating speed of 600-800r/min and the stirring time of 15-20min, and the third stage is high-speed stirring with the rotating speed of 900-1100r/min and the stirring time of 25-35min.
  9. 9. The preparation method of the coating for external wall insulation according to claim 6, wherein in the step S4, titanium pigment and talcum powder are required to be crushed and sieved in advance, stirring is divided into three stages, wherein the first stage is low-speed stirring, the rotating speed is 300-400r/min, the stirring time is 8-12min, the second stage is medium-speed stirring, the rotating speed is 500-700r/min, the stirring time is 15-20min, the third stage is high-speed stirring, the rotating speed is 800-1000r/min, and the stirring time is 10-15min.
  10. 10. The preparation method of the coating for the external wall insulation according to claim 6, wherein in the step S5, the base layer is cleaned and polished to ensure that the base layer is free of floating ash, greasy dirt and hollowness, the base layer bonding layer is constructed in a brushing mode, the surface protection layer is constructed in a brushing mode, the core insulation layer is constructed in a spraying mode, and the spray gun is kept vertical to the wall surface and uniform in moving speed during spraying; the construction environment temperature is 5-35 ℃, the relative humidity is less than or equal to 80%, the rain and insolation are avoided in the construction process, the maintenance environment temperature is 10-30 ℃, the relative humidity is more than or equal to 50%, and the collision and friction of the surface of the coating are avoided during the maintenance period; The coating thickness of the base layer adhesive layer is 0.5-1mm, the curing time is 24-48h, the spraying thickness of the core heat preservation layer is 5-8mm, the curing time is 48-72h, the coating thickness of the surface protective layer is 0.3-0.5mm, and the curing time is 24-36h.

Description

Coating for external wall insulation and preparation method thereof Technical Field The invention relates to the technical field of building energy-saving materials, in particular to a coating for external wall heat preservation and a preparation method thereof. Background The coating for outer wall heat preservation is one of core materials in the field of building energy conservation, is mainly applied to the surface of an outer wall of a building, realizes the functions of heat preservation, heat insulation and wall protection through layered structure design, can effectively reduce building energy consumption, improves building living comfort, protects an outer wall structure simultaneously, and prolongs the service life of the building. The coating is generally composed of a base layer bonding layer, a core heat-insulating layer and a surface protective layer, the compatibility of raw materials of each layer and the preparation process directly determine the comprehensive performance of the coating, wherein the vitrified microbead is used as the core heat-insulating raw material, the modification effect and the mixing uniformity of the vitrified microbead and other raw materials are key factors influencing the heat insulation and the structural stability of the coating, and the vitrified microbead is widely applied to various scenes such as civil buildings, industrial buildings, high-rise buildings and the like. At present, most technical schemes do not carry out standard modification treatment on vitrified microbeads or do not control key process details although carrying out modification when preparing a coating for external wall insulation in the prior art, and meanwhile, a single stirring mode is adopted when preparing each layer of slurry, and a staged stirring process is not designed according to the characteristics of raw materials; The compatibility of the vitrified microbeads with other raw materials such as aqueous acrylic emulsion, basalt short fiber and the like is poor, the slurry is unevenly mixed, and then the prepared external wall heat insulation coating is easy to generate caking and layering phenomena, has loose internal structure and insufficient structural stability, cannot meet the use requirements of heat insulation and protection of the external wall of a building for a long time, and limits the application range of the coating. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a coating for external wall heat preservation and a preparation method thereof, and solves the problems of uneven mixing of raw materials, easy occurrence of caking and layering of the coating and poor structural stability caused by the technical scheme that vitrified microbeads are not subjected to standard modification or a single stirring mode in the prior art. The coating for external wall insulation comprises a base layer bonding layer, a core insulation layer and a surface protection layer, wherein the base layer bonding layer, the core insulation layer and the surface protection layer are sequentially overlapped; the core heat-insulating layer comprises, by weight, 15-25 parts of modified vitrified microbeads, 20-30 parts of aqueous acrylic emulsion, 8-15 parts of expanded perlite, 3-8 parts of basalt short fibers, 1-3 parts of silane coupling agents, 0.5-2 parts of thickening agents, 0.3-1 part of defoaming agents, 1-2 parts of antifreezing agents and 15-25 parts of deionized water. Preferably, the base layer bonding layer comprises the following raw materials, by weight, 30-40 parts of Portland cement, 10-15 parts of acrylic resin, 15-20 parts of quartz sand, 0.5-1.5 parts of a silane coupling agent and 10-15 parts of deionized water; the surface protective layer comprises the following raw materials, by weight, 15-25 parts of fluorocarbon emulsion, 5-10 parts of titanium dioxide, 3-6 parts of talcum powder, 0.5-1.5 parts of ultraviolet resistance agent, 1-2 parts of film forming agent and 10-20 parts of deionized water. Preferably, in the core heat-insulating layer, the mass ratio of the modified vitrified microbeads to the expanded perlite is 1.5-2.5:1. Preferably, the basalt short fiber has a short cutting length of 1-5mm and is pretreated by a silane coupling agent KH560, the thickener is hydroxypropyl methylcellulose, the defoamer is an organosilicon defoamer, the antifreezing agent is glycol, and the film forming agent is polyethylene glycol. Preferably, the quartz sand is formed by mixing 20-30 meshes and 40-60 meshes according to the mass ratio of 1:2-3, and is dried at 60-80 ℃ until the water content is less than or equal to 5%, the titanium dioxide is rutile type titanium dioxide, and the particle size of talcum powder is 100-120 meshes. The preparation method of the coating for the external wall insulation comprises the following steps: s1, preparing modified vitrified micro bubbles, namely drying the vitrified micro bubbles, immersing the vitrified