Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Nano-inorganic/organic Silicon Hybrid UV Curable Coatings

Author LiuShiZuo
Tutor YangBaoPing;CuiJinFeng
School Lanzhou University of Technology
Course Chemical processes
Keywords Nanomaterials Inorganic-organic hybrid Polysiloxane UV curable coatings
CLC TB383.1
Type Master's thesis
Year 2008
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Traditional hybrid method is primarily coated modified by the coupling agent on the inorganic nano-particles, the use of the coupling agent is an amphoteric chemical structure, so that the modified inorganic particles are more easily dispersed into the organic phase, and through the coupling agent organic structure and the organic phase entwined. Typically, coupling agent does not react chemically with the organic phase body, coating wear to a certain extent when the coated modified inorganic particles will be accelerated to fall off from the coating film detached. To solve this problem, we synthesize a new hybrid UV-curable material. First prepared by a hybrid method of the inorganic UV curable organic hybrid oligomer, and then use of UV curing technology, the UV curable resin and the inorganic-organic hybrid the crosslinked oligomers cured, so that the organic phase and the inorganic phase is chemically combine to form a \Silicon tetrachloride, methyl acrylate, β-hydroxy ethyl, phenyl trichlorosilane, phenyl dichlorosilane, and nano-silica as main raw materials and synthesized a novel polypropylene acyloxy β-hydroxyethyl silicon the siloxane / nano-SiO 2 hybrid materials. The hybrid material with the epoxy acrylate resin and an aliphatic urethane acrylate resin complex was prepared by UV curing the hybrid coating, and the new hybrid material to test the thermal stability and mechanical properties of the coating. The main contents include: (1) The synthetic route of the polypropylene acyloxysilane exploratory study, formulated chlorosilane of hydrolytic polycondensation Preparation of polypropylene acyloxysilane synthetic route, and their product was subjected to infrared spectroscopy characterized obvious Si-OC bond and Si-O-Si (linear polysiloxane) appears on the key characteristic vibration peaks in the infrared spectrum, indicating possible to generate a silicone chain, indirect proof synthetic product likely to be successful in the introduction of a carbon-carbon double bond, and the polysiloxane having a photocurable activity. Further, the ratio of synthetic materials, to optimize the reaction conditions. Xylene ether mixture as solvent, the hydrolysis is controlled at a temperature between 60 ~ 70 ℃ n (phenyl acryloxy dichlorosilane): the n (PhCH 3 of SiCl 2 < / sub>): n (diacrylamide acyloxy dichlorosilane) = 1:7.5:5, the GZJ an amount of 1.5%, n (H 2 O): nCl = 0.9:1, the product set the shade stationary one week did not occur the phenomenon of a gel or cross-linking, the viscosity did not change significantly, viscosity for 198mpa s. (2) discussed on the polypropylene acyloxysilane nano-silica hybrid prepared hybrid mechanism; examine the the polypropylene acyloxysilane with nano-silica in different proportions resulting hybrid hybrid materials on coating wear resistance, adhesion and curing time of polypropylene acyloxysilane nanosilica hybrid (mass ratio) of 11:2; through detection means such as IR, SEM, TG. hybrid materials were characterized. Inferred from the chemical structure and microstructure of the advantages of hybrid materials in abrasion resistance, impact resistance. (3) effects of hybrid material coating adhesion, hardness, wear resistance, temperature resistance and impact resistance, determine the best content of the hybrid materials in the composite coating system for 17 wt%, resistance the grinding performance improvement of 45.5%, the hardness of 3H, adhesion an impact resistance of 50kg · cm; explained from the chemical bond and the micro-structural properties of the hybrid materials to improve the adhesion of the coating hardness, wear resistance, heat resistance reasons and impact resistance.

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