Preparation And Properties Of Nano Photocatalyst/Organic Fluorine Silicone Modified Acrylate Latex Composite Architectural Coating

With the gradually emerging of modern architectural decoration and thecontinuous improvement of people’s living standard, people began to use a lot ofbuilding decoration materials to improve the aesthetics of the bedroom and the livingenvironment, the performance requirements of building decoration materials is alsobecome higher. However, in the process of production, construction and use buildingdecoration materials general will send out a large number of organic solvents.That demands building coating not only has good weather resistance, stainresistance, aging resistance, water resistance, low VOC, but also has theenvironmental protection function of removing indoor air pollutants andantibiosis, Therefore, it is the current research focus of the coatings industry for us toresearch and development with high performance, environmentally friendly, morefunctional architectural coatings.First, a fluorine-containing polyacrylate copolymer emulsion with core-shellstructure was synthesized by pre-emulsification and semi-continuous polymerizationmethod, in which methyl methacrylate （MMA） and butyl acrylate （BA） as mainmonomers, hexafluorobutyl methacrylate （HFMA） the fluoride modified monomer.The experimental results showed that a clear core-shell structure existed in thefluorine-containing emulsion particles, fluorine is concentrated on the surface of theshell, when the Core/shell ratio is3:2, emulsifier ratio is3%, initiator ratio is0.6%,HFMA ratio is10%, the preparation of the fluorinated acrylate emulsion is excellent,with high cost effective. The chemical components, structure and performance ofcopolymer emulsion and emulsion films were characterized, which showedthe fluorine monomer engaged in the polymerization reaction, and formed theenrichment of fluorine atoms in the shells of core-shell structured fluorinated acrylateemulsion, and as the fluoride monomer increase, emulsion films waterproofantifouling properties, heat resistance and mechanical properties are improvedobviously. By reducing fluoride monomer dosage, to improve its comprehensiveperformance and cut the cost of production. A novel unhydrolyzed organosilicone monomer γ-[tris（trimethyloxysiloxy）]propyl methacrylate was synthesized by substitution reaction betweenγ-（methacryloxypropyl）-trimethloxy silane （KH-570） and chlorotrimethylsilane. Theproduction structure was characterized by FT-IR and H-NMR spectrum, showed thatKH-570molecule-OCH₃group has been replaced by-OSi （CH₃）₃group. Thesilicone acrylate copolymer emulsion with high silicon content was prepared by seedemulsion polymerization method, in which organosilicone monomer, methylmethacrylate （MMA）, butyl acrylate （BA） and acrylic acid （AA） as reactionmonomers materials. And the performance of latex film was characterized. Theresults indicated that the film of10%new silicone acrylate compound latex presentsexcellent water resistance, heating stability and mechanical property compared withthe pure acrylate latex films.Firstly, Na-montmorillonite as a carrier, nano-TiO₂were loaded onmontmorillonite by sol-gel method, and then MMT/TiO₂/Cu₂O compositephotocatalytic materials were prepared by chemical deposition. XRD analysisindicated TiO₂crystal is anatase phase mainly, accompanied with small amounts ofrutile phase, the purity of Cu₂O is very high, the SEM test showed that TiO₂wascoverage on the surface and the pore of montmorillonite, Cu₂O was distributed inthe TiO₂and montmorillonite surface uniformly. The ultraviolet-visible diffusereflectance spectrum analysis indicated MMT/TiO₂/Cu₂O compositephotocatalytic materials have two strong peaks in300⁶00nm absorption segment, itcan absorb ultraviolet light and visible light, which greatly promoted the utilization ofsun light, and a good solution for the TiO₂and Cu₂O easy aggregated in aqueousenvironment issues.This paper respectively selected organic fluorine modified acrylate copolymeremulsion and high silicon content of organic silicone modified acrylate copolymer asthe main film-forming material, rutile titanium dioxide as pigment, talcum powder asfiller, MMT/TiO₂/Cu₂O composite photocatalytic materials was added to latexpaint in the form of filler, add the corresponding additives, the basic properties of thelatex paint was measured. And then using the above preparation architectural latexpaint, studying on the degradation of formaldehyde gas under the condition ofsimulating indoor air environment, the coatings have a relatively higher rate of degradation of formaldehyde, which can achieve the purpose of purifying theorganic pollutants in the indoor and outdoor.