针状矿粉的表面复合改性及应用

Surface Organic and Inorganic Modification of Needle-like Mineral Powder and Its Application in PP and PA6

通过在硅灰石表面包覆硅酸铝对硅灰石进行无机改性,用硅烷对无机改性粉体进行表面有机改性后得到一种硅灰石复合改性粉体.将复合改性粉体填充PP和PA6制备了PP和PA6基复合材料;采用SEM,XRD,EDX,FT-IR等方法对复合改性硅灰石粉体以及填充PP和PA6复合材料的冲击断面进行了表征.结果表明,硅灰石表面的纳米硅酸铝粒子包覆及硅烷的有机改性可显著改善硅灰石和PP,PA6的结合界面,填充40%(ω)的复合改性粉体可使纯PP的拉伸强度由17.81MPa提高到21.97MPa,弯曲强度由23.72MPa提高到39.2MPa,热变形温度由65.7℃提高到94.3℃;填充30%(ω)的这种复合改性粉体可使纯PA6的拉伸强度由63.16MPa提高到80.26MPa,弯曲强度由84.02MPa提高到114.68MPa,弯曲模量由2296.23MPa提高到3893.99MPa,热变形温度由72.5℃提高到165.2℃.

A new complexed modified powder was obtained firstly by coating with aluminium silicate and then modified with silane.The PP and PA6 composites were obtained by filling it in PP and PA6.The modified wollastonite powder and its impact section in filling PP and PA6 were characterized by SEM,XRD,EDX,and FT-IR.The results showed that surface nano-modification of aluminium silicate and silane treatment notably improved the joint interface between wollastonite and PP as well as PA6,filling 40% of this modified powder in PP,the tensile strength,bending strength,and heating distortion temperature of the material were increased from 17.81 to 21.97 MPa,23.72 to 39.2 MPa,and 65.7℃ to 94.3℃,respectively,filling 30% of it in PA6,the tensile strength,bending strength,bending modulus,and heating distortion temperature of the material were increased from 63.16 to 80.26 MPa,84.02 to 114.68 MPa,2296.23 to 3893.99 MPa,and 72.5℃ to 165.2℃,respectively.