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CN-122011815-A - Single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers and preparation method and application thereof

CN122011815ACN 122011815 ACN122011815 ACN 122011815ACN-122011815-A

Abstract

The invention discloses a single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers, and a preparation method and application thereof. The raw materials for preparing the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating comprise, by weight, 18-22% of SiC/Al 2 O 3 composite whiskers, 8-12% of nano TiO 2 , 35-38% of silica sol, 12-15% of nano ZrO 2 , 5-8% of apatite antibacterial agent, 2-3% of lithium bentonite, 1.5-2% of silane coupling agent and the balance of water. The paint solves the problems of no high temperature resistance, VOC pollution and poor weather resistance, breaks through the limit of 'high temperature curing' and realizes 0 ℃ cold coating, and meanwhile, the paint integrates the high temperature resistance and cold coating characteristics of 1500 ℃ and is more convenient for construction of a single-component system.

Inventors

  • WANG LIPING
  • MAO FEIXIONG
  • WANG ERQIANG
  • TANG JUNWU
  • ZHANG YINGXIN
  • ZHAO HAICHAO
  • JIANG JIANGBO
  • TANG ZIZHENG

Assignees

  • 中国科学院宁波材料技术与工程研究所

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. The single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing the nano whiskers is characterized by comprising, by weight, 18-22% of SiC/Al 2 O 3 composite whiskers, 8-12% of nano TiO 2 , 35-38% of silica sol, 12-15% of nano ZrO 2 , 5-8% of apatite antibacterial agent, 2-3% of lithium bentonite, 1.5-2% of silane coupling agent and the balance of water.
  2. 2. The single-component inorganic cold-coating high-temperature-resistant self-cleaning coating according to claim 1, wherein the diameter of the SiC/Al 2 O 3 composite whisker is 50-100 nm, and the length-diameter ratio is more than 50; and/or the particle size of the nano TiO 2 is less than or equal to 20nm; and/or the Na+ content in the silica sol is less than 0.1 weight percent, and the particle size of SiO 2 is 10-15 nm; And/or the grain diameter of the nano ZrO 2 is 20-100 nm, preferably 30-80 nm, and/or the phase of the nano ZrO 2 is a monoclinic phase; And/or, the SiC/Al 2 O 3 composite whisker has a core-shell structure; And/or, the SiC/Al 2 O 3 composite whisker comprises a SiC/γ -Al 2 O 3 composite whisker.
  3. 3. The single-component inorganic cold-coating high-temperature-resistant self-cleaning coating according to claim 1, wherein the preparation method of the SiC/Al 2 O 3 composite whisker comprises the following steps: carrying out surface pretreatment and plasma activation on the SiC whisker to obtain an activated SiC whisker; And growing an amorphous alumina hydrate shell layer on the surface of the activated SiC whisker in situ by adopting a sol-gel method, and then carrying out separation, drying and gradient crystallization heat treatment to obtain the SiC/Al 2 O 3 composite whisker.
  4. 4. The one-component inorganic cold-coating high-temperature-resistant self-cleaning coating according to claim 1, wherein the chemical formula of the apatite antibacterial agent is Ca 10 (PO 4 ) 6 (OH) 2 , wherein Ca/P=1.67; and/or, the thixotropic index of the lithium bentonite is >4.5; And/or the silane coupling agent comprises a silane coupling agent containing epoxy group, amino group or (methyl) acryloyloxy group, and preferably, the silane coupling agent comprises gamma-glycidoxypropyl trimethoxy silane (KH-560).
  5. 5. A method for preparing the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers according to any one of claims 1 to 4, which is characterized by comprising the following steps: Activating the SiC/Al 2 O 3 composite whisker by adopting argon plasma to obtain an activated whisker; Blending and ball milling the activated whisker and nano TiO 2 to prepare a TiO 2 coated whisker compound; And mixing silica sol and water for pre-dispersion, adding TiO 2 to coat the whisker complex, shearing at high speed, sequentially adding nano ZrO 2 and an apatite antibacterial agent for ultrasonic treatment, and finally adding an auxiliary agent for curing treatment to obtain the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating.
  6. 6. The method of claim 5, wherein the activating treatment is performed at a power of 300W for 10min; And/or the technological parameters adopted in the blending ball milling treatment comprise phi 3mm zirconia balls, wherein the ball-to-material ratio is (4-6): 1, the rotating speed is 300-500 rpm, and the time is 1.5-3 hours; and/or the rotational speed adopted by the pre-dispersion is 800-1200 rpm, and the time is 5-15 min; and/or the rotation speed adopted by the high-speed shearing is 2500-3500 rpm, and the time is 20-40 min; and/or the power adopted by the ultrasonic treatment is 35-45 kHz, and the time is 15-30 min; and/or the curing treatment time is 12-48 h.
  7. 7. The method according to claim 5, wherein the auxiliary agent comprises any one or a combination of a plurality of dispersing agents, rheology auxiliary agents, defoamers, wetting agents, pH regulators and antifreezes; And/or the auxiliary agent accounts for 0.5-5wt% of the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing the nano whisker; and/or the surface-OH density of the activated whiskers is 8.2/nm 2; And/or the viscosity of the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating is 3500+/-200 mPa.s, and the particle size distribution D90 is less than 100nm.
  8. 8. The preparation method of the high-temperature-resistant self-cleaning antibacterial mildew-proof coating is characterized by comprising the following steps of: preparing a single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers by adopting the preparation method of any one of claims 5 to 7; and applying the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating on the surface of the substrate in an environment with the temperature of more than 0 ℃ and curing to obtain the high-temperature-resistant self-cleaning antibacterial mildew-proof coating.
  9. 9. The high temperature resistant self-cleaning antimicrobial mildew-resistant coating made by the method of claim 8.
  10. 10. Use of a single-component inorganic cold-coating high-temperature resistant self-cleaning coating containing nanowhiskers according to any one of claims 1 to 4 or a high-temperature resistant self-cleaning antibacterial mildew-proof coating according to claim 9 in low-temperature environment construction, mildew-proof in humid environment, long-term fouling resistance of tunnels/bridges.

Description

Single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers and preparation method and application thereof Technical Field The invention belongs to the technical field of building coating, and in particular relates to single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers, and a preparation method and application thereof, which are particularly suitable for scenes with strict requirements on fire resistance, environmental protection, weather resistance and construction conditions. Background In the existing coating market, the organic coating has the problems of poor environmental protection, low high temperature resistance (usually lower than 200 ℃ in tolerance), easy aging and the like due to the fact that the organic coating contains organic solvents (VOC), and is easy to release harmful substances in a personnel-intensive area or a closed environment, and does not meet the requirements of high environmental protection and fire prevention, while the traditional inorganic coating has certain high temperature resistance, but needs high-temperature curing (usually more than 80 ℃), the construction is greatly limited by temperature, the function is single (for example, the coating has fire resistance only, and lacks comprehensive properties such as antibacterial property and self-cleaning property), and the requirements of complex scenes (for example, low-temperature environment construction, mildew resistance in humid environment, long-term pollution resistance of tunnels/bridges and the like) are difficult to meet. In order to solve the problems, it is needed to develop a single-component inorganic coating which does not need high-temperature curing, has high temperature resistance, self-cleaning, antibacterial and mildew-proof properties and wide applicability, and aims to solve the problems of severe construction conditions, single function, insufficient environmental protection and the like in the prior art. Disclosure of Invention The invention mainly aims to provide a single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers, and a preparation method and application thereof, so as to overcome the defects of the prior art. In order to achieve the purpose of the invention, the technical scheme adopted by the invention comprises the following steps: The embodiment of the invention provides a single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing nano whiskers, which is prepared from the following components, by weight, 18-22% of SiC/Al 2O3 composite whiskers, 8-12% of nano TiO 2, 35-38% of silica sol, 12-15% of nano ZrO 2, 5-8% of apatite antibacterial agent, 2-3% of lithium bentonite, 1.5-2% of silane coupling agent, and the balance of water. The embodiment of the invention also provides a preparation method of the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating containing the nano whisker, which comprises the following steps: Activating the SiC/Al 2O3 composite whisker by adopting argon plasma to obtain an activated whisker; Blending and ball milling the activated whisker and nano TiO 2 to prepare a TiO 2 coated whisker compound; And mixing silica sol and water for pre-dispersion, adding TiO 2 to coat the whisker complex, shearing at high speed, sequentially adding nano ZrO 2 and an apatite antibacterial agent for ultrasonic treatment, and finally adding an auxiliary agent for curing treatment to obtain the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating. . The embodiment of the invention also provides a preparation method of the high-temperature-resistant self-cleaning antibacterial mildew-proof coating, which comprises the following steps: The single-component inorganic cold-coating high-temperature-resistant self-cleaning paint containing the nano whiskers is prepared by adopting the preparation method; and applying the single-component inorganic cold-coating high-temperature-resistant self-cleaning coating on the surface of the substrate in an environment with the temperature of more than 0 ℃ and curing to obtain the high-temperature-resistant self-cleaning antibacterial mildew-proof coating. The embodiment of the invention also provides the high-temperature-resistant self-cleaning antibacterial mildew-proof coating prepared by the preparation method. The embodiment of the invention also provides application of the single-component inorganic cold-coating high-temperature-resistant self-cleaning paint or the high-temperature-resistant self-cleaning antibacterial mildew-proof coating containing the nano whiskers in construction in a low-temperature environment, mildew prevention in a humid environment and long-term pollution resistance of tunnels/bridges. Compared with the prior art, the invention has the bene