Ag+-Zn2+-zeolite antimicrobial (AZZA) with high antibacterial efficiency and good color stability was prepared by ion-exchange method in water phase, followed by surface modification. Taking the modified AZZA as raw material, antibacterial polyethylene (PE) master batch was prepared and applied in PE plastic. In this paper, the technological parameters to prepare AZZA were optimized, and the effect of antimicrobial addition on the mechanical property and antibacterial property of PE plastic was studied as well. As shown in SEM analysis, AZZA particles were distributed homogeneously in PE plastic, and was compatible with the PE matrix well. The mechanical property of PE sample was not influenced notably when the adding amount of modified AZZA was less than 6%.
Surface modification is very important to industrial application of the magnesium hydroxide (MDH) powder, which is used as a kind of environment-friendly flame-retardant. In this paper, a kind of MDH powder surface-modified with silicane coupling agent and stearic acid is synthesized, and its potential usage in the flame-retardant treatment of flexible PVC is studied. The influence of the surface treatment to the dispersion of the powder in PVC, the flame-retardant and other physical properties of the MDH flame-retardant treated flexible PVC are discussed in detail. The surface modification mechanism of MDH is studied by the FTIR analysis, and then the surface modification model is established. Results show that molecules between the surface of the particle and these two modifiers form stable chemical bonds, and this kind of surface modification can improve the MDH’s dispersion and the compatibility of the flexible PVC. When the flame-retardant flexible PVC is produced according to the mass composition of PVC/DOP/MDH=100:50:80 and a few other additives, its oxygen index is 31.5, the elongation at break is 240%, the tensile strength is 13.0MPa, the hypothermia tendering is +30/-0, the volume resistivity at 20°C is 3.2×1011Ω•m. These index are just correspondent with requires of the halogen-free fire-retardant flexible PVC.
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