Search

CN-118325369-B - Silicate antibacterial paint and preparation method thereof

CN118325369BCN 118325369 BCN118325369 BCN 118325369BCN-118325369-B

Abstract

The invention discloses a silicate antibacterial coating which comprises the following raw materials, by weight, 100 parts of inorganic silicate, 1-30 parts of an antibacterial modifier, 10-100 parts of silica sol, 1-10 parts of a dispersing agent, 0-30 parts of a thickening agent, 0-10 parts of a defoaming agent, 10-30 parts of an inorganic filler, 0-30 parts of a silicone-acrylate emulsion and 1-100 parts of water. The preparation method comprises the following steps of (1) weighing raw materials, (2) uniformly mixing inorganic silicate, an antibacterial modifier, silica sol, a dispersing agent, a thickening agent, a defoaming agent, inorganic filler and silicone-acrylic emulsion, (3) adding water, uniformly stirring, and (4) grinding and filtering to obtain the product. The invention realizes the long-acting antibacterial property of the coating, enhances the hydrophobic property of the coating, and expands the application prospect of the coating in a humid environment.

Inventors

  • NI YUNXIA
  • SUN FUQIAN
  • CHENG ZIYAO
  • ZENG GUOPING
  • ZHANG JUN
  • HU RONGJUN

Assignees

  • 江西省科学院应用化学研究所

Dates

Publication Date
20260508
Application Date
20240424

Claims (9)

  1. 1. The silicate antibacterial paint is characterized by comprising the following raw materials, by weight, 100 parts of inorganic silicate, 1-30 parts of an antibacterial modifier, 10-100 parts of silica sol, 1-10 parts of a dispersing agent, 0-30 parts of a thickening agent, 0-10 parts of a defoaming agent, 10-30 parts of an inorganic filler, 0-30 parts of a silicone-acrylate emulsion and 1-100 parts of water; the antibacterial modifier is an active silane antibacterial modifier with side chain containing sulfonium ions, and the structural formula is Wherein m=0-3, n=0-18.
  2. 2. The silicate antibacterial paint according to claim 1, which is characterized by comprising the following raw materials, by weight, 100 parts of inorganic silicate, 30 parts of an antibacterial modifier, 10 parts of silica sol, 5 parts of a dispersing agent, 20 parts of a thickening agent, 2 parts of an antifoaming agent, 10 parts of an inorganic filler, 5 parts of a silicone-acrylate emulsion and 30 parts of water.
  3. 3. A silicate antimicrobial coating according to claim 1 or 2, wherein the inorganic silicate is potassium silicate.
  4. 4. The silicate antibacterial paint according to claim 1 or 2, wherein the antibacterial modifier is prepared by the following steps: (1) Dissolving vinyl alkoxy silane and ethanethiol in tetrahydrofuran, and carrying out ultraviolet catalysis under the protection of nitrogen to obtain (2- (ethylthio) ethyl) trialkoxysilane; (2) Dissolving (2- (ethylthio) ethyl) trialkoxysilane and fluorine-containing iodoalkane in tetrahydrofuran, adding a base catalyst, and reacting overnight to obtain the antibacterial modifier.
  5. 5. The silicate antibacterial paint according to claim 4, wherein in the step (1), the mass ratio of the vinyl alkoxy silane, the ethanethiol and the tetrahydrofuran is 1.1g to 1.2g to 20mL, and the ultraviolet catalytic ultraviolet light has a wavelength of 365nm for 2 hours.
  6. 6. The silicate antibacterial paint according to claim 4, wherein in the step (2), the fluorine-containing iodoalkane is 1, 2-pentafluoro-3-iodopropane, the base catalyst is triethylamine, and the mass ratio of the (2- (ethylthio) ethyl) trialkoxysilane, the fluorine-containing iodoalkane, the tetrahydrofuran and the base catalyst is 1g to 2g to 20mL to 0.2mL.
  7. 7. The silicate antibacterial paint according to claim 1 or 2, wherein the dispersing agent is at least one of acrylic acid copolymer, sodium phosphate salt, potassium phosphate salt, sodium carboxylate salt and potassium carboxylate salt, and the thickener is at least one of alumina, bentonite, aluminum silicate, carboxymethyl cellulose, chitosan and sodium alginate.
  8. 8. The silicate antibacterial paint according to claim 1 or 2, wherein the defoaming agent is at least one of silicone oil, amino sulfate, amino acetate, sodium silicate, magnesium silicate, aluminum hydroxide, magnesia and zinc oxide, and the inorganic filler is at least one of kaolin, talcum powder, silica lime, mica, clay and asbestos.
  9. 9. The preparation method of the silicate antibacterial paint is characterized by comprising the following steps of: (1) Weighing the raw materials according to the weight parts of the silicate antibacterial paint as claimed in any one of claims 1 to 8; (2) Uniformly mixing inorganic silicate, an antibacterial modifier, silica sol, a dispersing agent, a thickening agent, a defoaming agent, inorganic filler and silicone-acrylic emulsion to obtain a mixture; (3) Adding water into the mixture, and uniformly stirring to obtain slurry; (4) Grinding and filtering the slurry to obtain the silicate antibacterial coating.

Description

Silicate antibacterial paint and preparation method thereof Technical Field The invention relates to the technical field of building coatings, in particular to a silicate antibacterial coating and a preparation method thereof. Background Inorganic silicate paint is commonly called inorganic mineral paint, and the main components are liquid potassium silicate and inorganic oxide metal. The paint uses natural inorganic minerals as raw materials, does not contain toxic and harmful substances, can decompose formaldehyde, purify air, and pollute the formaldehyde, benzene and other toxic and harmful substances in one sweep of room, and has great benefits for patients with weak resistance and medical equipment, medical experiments, assays and the like with high requirements on cleanliness. The antimicrobial properties of materials are currently a concern. In residential buildings, the wall surface area is the largest, and thus the wall surface is the final destination of bacteria and viruses in indoor air. The hospital is a bacterial gathering place, and researches show that the density of pathogenic bacteria remained in air and on the wall surface of a living room space, a hospital, a school, a kindergarten, a hotel and the like is far higher than that of an outdoor place, and if the bacteria cannot be effectively controlled, the bacteria are extremely easy to cause large-scale cross infection. Therefore, how to develop a silicate antimicrobial coating is a problem that needs to be solved by those skilled in the art. Disclosure of Invention In view of the above, the invention aims to provide a silicate antibacterial coating and a preparation method thereof, and the antibacterial property of the coating is enhanced by an organic fluorine-silicon antibacterial modifier so as to solve the problem of poor water resistance of inorganic silicate coatings in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: the silicate antibacterial paint comprises, by weight, 100 parts of inorganic silicate, 1-30 parts of an antibacterial modifier, 10-100 parts of silica sol, 1-10 parts of a dispersing agent, 0-30 parts of a thickening agent, 0-10 parts of a defoaming agent, 10-30 parts of an inorganic filler, 0-30 parts of a silicone-acrylate emulsion and 1-100 parts of water. Preferably, the composition comprises 100 parts of inorganic silicate, 30 parts of antibacterial modifier, 10 parts of silica sol, 5 parts of dispersing agent, 20 parts of thickener, 2 parts of defoamer, 10 parts of inorganic filler, 5 parts of silicone-acrylic emulsion and 30 parts of water. Further, the inorganic silicate is potassium silicate. The adoption of the above-mentioned further advantageous effect is that, among the inorganic silicate, sodium silicate is poor in water resistance and severe in salting-out phenomenon. Lithium silicate, although good in performance, is expensive. In contrast, the potassium silicate has excellent comprehensive performance and high cost performance, so the potassium silicate is selected as a film forming substance of the inorganic silicate paint. Further, the antibacterial modifier is an active silane antibacterial modifier with side chain containing sulfonium ions, and the structural formula is as followsWhere m=0-3, n=0-18, preferably m=0, n=1. The use of the above has the further beneficial effect that the sulfonium ions have more concentrated charge centers than the quaternary ammonium salts, and the antibacterial property is superior to that of the quaternary ammonium salts. Further, the preparation method of the antibacterial modifier comprises the following steps: (1) Dissolving vinyl alkoxy silane and ethanethiol in tetrahydrofuran, and carrying out ultraviolet catalysis under the protection of nitrogen to obtain (2- (ethylthio) ethyl) trialkoxysilane; (2) Further utilizing nucleophilic reaction of side group thioether and fluorine-containing iodoalkane, dissolving (2- (ethylthio) ethyl) trialkoxysilane and fluorine-containing iodoalkane in tetrahydrofuran, adding base catalyst, and making reaction overnight so as to obtain the invented antibacterial modifier. Furthermore, the mass ratio of the vinyl alkoxy silane to the ethanethiol to the tetrahydrofuran is 1.1g to 1.2g to 20mL, the ultraviolet catalytic ultraviolet wavelength is 365nm, and the time is 2h. The (2- (ethylthio) ethyl) trialkoxysilane is synthesized by taking tetrahydrofuran as a solvent, and performing click chemical reaction on vinyl alkoxy silane and ethanethiol under ultraviolet irradiation. Further, the fluorine-containing iodoalkane is 1, 2-pentafluoro-3-iodopropane, the base catalyst is triethylamine, (2- (ethylthio) ethyl) trialkoxysilane, the fluorine-containing iodoalkane, tetrahydrofuran and the base catalyst are in a mass ratio of 1g to 2g to 20mL to 0.2mL. The preparation method has the further beneficial effects that the nucleophilic reaction containing I is utilized, th