Preparation and properties of modified palygorskite/sappanwood hybrid pigments
Three kinds of modified palygorskite(PAL)(PCS,PDO,PKH)were prepared by organic modification of PA(chitosan,cationic surfactant dioctadecyl dimethyl ammonium chloride,silane coupling agent KH550),which were obtained from hydrochloric acid treatment of PAL,and PCS,PDO,PKH as well as PA were then loaded with sappanwoood color to synthesize four types of modified palygorskite/sappanwood hybrid pigments(short for hybrid pigment,the same below).Through FTIR,XRD,TEM,BET,TG and color characterization,the effects of different modification methods on the powder properties,stability and biosafety of hybrid pigments were further analyzed.The results showed that organic modification and sappanwoood color loading did not change the crystal structure and fiber morphology of PAL,while the hybrid pigments significantly improved the thermal stability,acid-base stability and covering power of sappanwoood color.Hybrid pigment PCSS prepared from chitosan modified PAL showed better comprehensive properties,improved thermal stability(ΔE<6 on exposure to 120℃for 6 h),the best acid-base stability(ΔE<4 on soaking in pH=5～7 solution for 24 h),the lowest water-alcohol dissolution degree(2.13 mg/g in water and 1.02 mg/g in ethanol),and high biosafety(non-irritant to vascular membrane).
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