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CN-122011864-A - Invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis and preparation method thereof

CN122011864ACN 122011864 ACN122011864 ACN 122011864ACN-122011864-A

Abstract

The invention discloses a invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis and a preparation method thereof. The waterproof agent comprises a photocatalysis composite master batch and a water-based main system, wherein the photocatalysis composite master batch comprises a mixed solvent, petroleum aromatic hydrocarbon resin, molybdenum disulfide nanosheets, nano titanium dioxide, polyethylene wax micropowder, phenyl modified silicone oil and a polymer block compatilizer. According to the method, the mass ratio of the molybdenum disulfide to the titanium dioxide and the heating ultrasonic and thermal insulation curing process are accurately controlled, so that the molybdenum disulfide and the titanium dioxide are mutually embedded to form a heterojunction. The multifunctional bridging and catalysis synergistic effect of the molybdenum disulfide nanosheets not only realizes the stable compatibility of the hydrophobic component and the aqueous emulsion, but also more creatively introduces a high-efficiency visible light catalysis self-cleaning function for the waterproof coating, and solves the problem of single passive function of the traditional waterproof agent.

Inventors

  • WU JIAHUA
  • FANG LIANG
  • LIU ZIQIANG
  • GAO FENG
  • JIANG YOU

Assignees

  • 黄山华康新材料科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis is characterized by comprising a photocatalysis composite master batch and a water-based main system; The photocatalysis composite master batch comprises, by mass, 18-22 parts of a mixed solvent, 4-6 parts of petroleum aromatic hydrocarbon resin, 0.2-0.6 part of molybdenum disulfide nanosheets, 0.1-0.3 part of nano titanium dioxide, 1-2 parts of polyethylene wax micro powder, 1.5-2.5 parts of phenyl modified silicone oil and 0.2-0.4 part of a polymer block compatilizer.
  2. 2. The invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis according to claim 1 is characterized by comprising, by mass, 68-75 parts of silicone-acrylic emulsion, 1-2 parts of polyurethane hardening agent, 2-3 parts of film forming auxiliary agent, 0.5-1 part of wetting dispersant, 0.4-0.8 part of defoamer, 0.2-0.4 part of thickener and 4-8 parts of deionized water.
  3. 3. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis is characterized by comprising the following specific steps of: Adding molybdenum disulfide nanosheets and nano titanium dioxide into a mixed solvent, shearing and dispersing at a high speed at normal temperature to obtain a primary dispersion liquid, and then carrying out ultrasonic treatment on the temperature of the dispersion liquid to obtain a uniform and stable molybdenum disulfide/titanium dioxide composite dispersion liquid; step 2, heating the composite functional resin liquid, adding polyethylene wax micropowder under high-speed shearing, and stirring at a temperature and under a shearing force to completely melt and disperse the polyethylene wax; Step 3, cooling the system obtained in the step 2 to a specified temperature, sequentially adding phenyl modified silicone oil and a polymer block compatilizer under continuous high-speed shearing, and continuing shearing after the addition is finished to obtain a photocatalysis composite master batch; Step 4, placing the silicone-acrylate emulsion in a reaction kettle, sequentially adding a film forming auxiliary agent, a wetting dispersant and a defoaming agent under low-speed stirring, and stirring to obtain a dispersed emulsion; Step 5, slowly adding the photocatalysis composite master batch prepared in the step 3 into a part of dispersion emulsion under high-speed shearing to form uniform pre-emulsified slurry; step 6, slowly adding the pre-emulsified slurry into the rest of the dispersed emulsion under low-speed stirring, then adding the polyurethane hardening agent, and then stirring at a medium speed under a specified rotating speed to ensure uniform mixing; step 7, pre-dissolving the thickener with partial deionized water, adding the rest deionized water into the system, and continuously stirring at a specified rotating speed; And 8, standing and curing the obtained product at normal temperature, and filtering by a precision filter to obtain a finished product of the invisible waterproof agent.
  4. 4. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis as claimed in claim 3, wherein in the step 1, the molybdenum disulfide nanosheets are of a few-layer structure, the number of layers is 1-5, the lateral dimension of each lamellar is 0.2-1.5 μm, and the purity is not less than 99%.
  5. 5. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis according to claim 3 or 4, wherein in the step 1, the nano titanium dioxide is anatase, and the particle size is 10-50 nm.
  6. 6. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis, which is characterized in that the mass ratio of the molybdenum disulfide nanosheets to the nano titanium dioxide is (2:1) to (3:1).
  7. 7. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis of claim 6 is characterized in that the phenyl content of the phenyl modified silicone oil in the step 3 is 15% -35%, and the viscosity is 500-2000 mPa.s.
  8. 8. The method for preparing the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis according to claim 5, wherein in the step 3, the polymer block compatilizer is one or two of ethylene oxide-propylene oxide block copolymer and polyether modified polysiloxane.
  9. 9. The preparation method of the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis according to claim 5, wherein in the step 4, the solid content of the silicone-acrylic emulsion is 40% -60%, and the glass transition temperature is 15-25 ℃.
  10. 10. The method for preparing the invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis according to claim 5, wherein in step 5, the amount of the partial dispersion emulsion used for pre-emulsification is 10% -20% of the total amount of the dispersion emulsion.

Description

Invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis and preparation method thereof Technical Field The invention belongs to the technical field of waterproof coatings, and particularly relates to a invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis and a preparation method thereof. Background The building outer wall is exposed to the environment such as rainwater, ultraviolet rays, pollutants and the like for a long time, so that the problems of water seepage, cracking, weathering, algae breeding, dirt adhesion and the like are easy to occur, the beauty and sanitation are affected, the aging of building materials is accelerated, and the service life of the building is shortened. The traditional outer wall waterproof material mainly comprises organic silicon, acrylic resin and the like, has certain hydrophobicity and weather resistance, but has single passive function, and has obvious defects in the aspects of long-acting self-cleaning, biological pollution resistance, intelligent response and the like. Especially for buildings which pay attention to historical landscape protection or modern aesthetic requirements, how to endow the coating with active protection capability on the premise of not changing the appearance (namely 'invisible') is a current technical difficulty. At present, research for improving the functionality of a coating is mainly developed along two directions, namely, a super-hydrophobic surface is constructed, a lotus leaf effect is realized by utilizing a micro-nano coarse structure to repel water and prevent pollution, and a photocatalytic material (such as nano titanium dioxide) is introduced, and surface organic matters are degraded by utilizing the photooxidation capability of the photocatalytic material to realize self cleaning. However, the two paths are independently applied, namely, a simple super-hydrophobic structure is easy to damage in an outdoor complex environment (such as dust accumulation and mechanical abrasion), so that functions are fast invalid, the high roughness often sacrifices the transparency of a coating, the independently used nano titanium dioxide has high photo-generated electron-hole pair recombination rate, low quantum efficiency and limited catalytic activity under visible light, and the dispersibility and stability of the independently used nano titanium dioxide in the coating are also challenges. In recent years, two-dimensional nanomaterials (e.g., graphene oxide) have been tried as reinforcement and barrier layers for coatings due to their unique lamellar structure and controllable surface properties to improve overall performance. However, such materials provide primarily a physical barrier and passive protection, and have limited ability to impart active smart properties to the coating environment, energy conversion, and the like. Therefore, a stable and environment-friendly coating system which can organically combine high-efficiency photocatalysis self-cleaning capability with excellent invisible waterproof performance is developed, and has important practical application value. The research shows that molybdenum disulfide is taken as a typical two-dimensional transition metal sulfide, a lamellar structure similar to graphene can be taken as a physical barrier layer, a special energy band structure of the molybdenum disulfide can form a heterojunction with titanium dioxide, the separation of photon-generated carriers is effectively promoted, and the catalytic efficiency of the titanium dioxide in a visible light region is greatly improved. The synergistic effect provides a brand new material basis and technical path for constructing the next generation of active intelligent protective coating. Disclosure of Invention The invention aims to provide a molybdenum disulfide/titanium dioxide synergistic photocatalysis-based invisible waterproof agent and a preparation method thereof, which are invisible and transparent coating films, have excellent waterproof property, wear resistance and durability, and have a visible light response self-cleaning function. More specifically, the invention constructs a high-efficiency heterostructure at the interface by precisely controlling the mass ratio of molybdenum disulfide and titanium dioxide and the composite process, thereby remarkably improving the photocatalysis self-cleaning efficiency and stability of the coating. Therefore, the invention also provides a preparation method of the waterproof agent. The technical scheme adopted for solving the technical problems is as follows: the invention provides a invisible waterproof agent based on molybdenum disulfide/titanium dioxide synergistic photocatalysis, which comprises a photocatalysis composite master batch and a water-based main system. The photocatalysis composite master batch comprises, by mass, 18-22 parts of a mixed solvent, 4-6 parts of petroleum aromatic h