Research Of The Polyurethane Anti-skid Deck Coatings Reinforced By SiC Fibers

Currently, the domestic anti-skid deck coatings are faced with the problems of low adhesion, inclination to aging and poor performance under low temperatures. To alleviate these problems, this research develops a new type of Si C fibers reinforced anti-skid deck coatings. Specifically, this research focuses on the influence of the polyurethane matrix on modified epoxy resin, the production and modification of Si C short fibers, the design and optimization of the new type of Si C fiber reinforced anti-skid deck coatings. Finally, an optimal formula of these Polyurethane coatings would be proposed and determined.Research shows that the performance of synthesized epoxy/polyurethane?PUE?matrix was obviously improved by using E44 epoxy resin modified PTMG/MDI type polyurethane as pre-polymer.The optimal synthetic conditions for epoxy-modified polyurethane matrix was researched: at 80?, the one-step addition process is adopted to mix the MDI-100 LL and the PTMG-1000 with the mass ratio of 5:5. After chemical reaction for two hours. Then, 6% E44 were added at 60? to modify the characteristics of pre polymer for an hour, some procedures were applied to control the final percentage of-NCO between 6 and 7. The properties of polyurethane-modified epoxy matrix were experimented, with the tensile strength 7.36 MPa, elongation at break270.12%, adhesion 5.63 MPa and the amount of wear 5.3mg.After modification with KH570?silane coupling agent?, the surface of Si C fiber was grafted with organic functional groups, resulted in the decrease of particles adsorption and the improved dispersion in the matrix. The impact of 2.5% KH570 on the adhesion and viscosity of coatings were the lowest while the modification effect was the optimum with 9% amount of Si C fiber.The friction coefficient of coating could be effectively improved by the mixture of Si C fibers and Al₂O₃ as the additives of antiskid agent. The friction coefficients under dry, wet and oil state were corresponding to 0.83,0.70 and 0.68 with the abrasion amounts of 6.95 mg while the adhesion decreased slightly to 5.53 MPa.Pigments and fillers could effectively improve coating properties with decreased cost and increased solid contents. The optimal amount of pigments and fillers was determined through orthogonal experiments, the precipitate Ba SO4 8-9%, 9-11%titanium dioxide and 2-3% talc. Performances correspondingly were: the abrasion quantity be 1.1 mg, the friction coefficients 0.86, 0.73, 0.68 under dry, wet and oil state,and the adhesion of 6.38 MPa.Defoaming agent and smoothing agent could effectively reduce the defects of bubbles and shrinkage cavities, etc. lessening the difficulty in coating construction. Theoptimal amount of BYK-066 N and BYK-330 was 0.4 % and 0.3 % of the whole system, respectively.The present polyurethane anti-skid deck coating reinforced with Si C fiber exhibits excellent comprehensive performance. The performance indicators were that the abrasion quantity be 1.1mg, the friction coefficient be 0.86?dry state?, 0.73?wet state?and 0.69?oil state?, the adhesion strength be 6.38 MPa, and the no-volatile content be74.1%.In summary, the mixture of Si C fiber and Al₂O₃ particles was used to reinforce the epoxy modified polyurethane anti-skid deck coating. The skid resistance and abrasion resistance of the studied coating were effectively improved. Besides, the developed coating in this paper had strong adhesion strength and good flexibility, be resistance to acid, alkali and salt, and could be solidified at room temperature. Thus it pave a new way for fiber reinforced antiskid deck coating research in domestic and is worth for further research and widespread application.