复配型钛酸酯及其对超细碳酸钙/PP复合材料的性能影响

Compound Titanate and Its Effect on the Properties of Ultrafine Calcium Carbonate/PP Composites

为了改善超细碳酸钙在PP中的分散性,将钛酸酯TMC-105与硬脂酸进行不同比例的复配,研究了不同复配比例对超细碳酸钙干法改性效果的影响,并通过吸油值、活化度和接触角测量仪及傅立叶变换红外光谱仪、热重分析仪和场发射扫描电子显微镜对碳酸钙的改性效果和改性机理进行分析;改性后的碳酸钙填充PP制备碳酸钙/PP复合材料,研究了单一和复配改性对复合材料力学性能的影响,并用扫描电镜观察碳酸钙在PP中的分散性。结果表明:钛酸酯TMC-105和硬脂酸单一改性的最佳用量为碳酸钙质量的1.5%和3%,复配改性的最佳配比为35%硬脂酸+65%TMC-105。单一改性及复配改性碳酸钙填充PP后,复合材料的力学性能均有提高,复配改性的力学性能最好,其拉伸、弯曲和冲击强度比未改性碳酸钙/PP复合材料提高了19.4%、22.6%和51.5%。复配改性的超细碳酸钙在PP中的分散性最好,基本不发生团聚。

In order to improve the dispersibility of superfine calcium carbonate in PP,titanium titanate TMC-105 and stearic acid were compounded in different proportions,and the effect of different compounding ratios on the dry modification effect of ultrafine calcium carbonate was studied.And through the oil absorption value,activation degree and contact angle measuring instrument,Fourier transform infrared spectrometer,thermogravimetric analyzer and field emission scanning electron microscope to analyze the modification effect and modification mechanism of calcium carbonate;modified calcium carbonate filled PP Calcium carbonate/PP composites were prepared,the effects of single and compound modification on the mechanical properties of the composites were studied,and the dispersibility of calcium carbonate in PP was observed with a scanning electron microscope.The results show that the optimal dosage of single modification of titanate TMC-105 and stearic acid is 1.5%and 3%of the mass of calcium carbonate,and the optimal ratio of compound modification is 35%stearic acid+65%TMC-105.After the single modified and compound modified calcium carbonate filled PP,the mechanical properties of the composite materials were improved,and the compound modified mechanical properties were the best.Its tensile,bending and impact strengths were higher than those of the unmodified calcium carbonate/PP compound.Materials improved by 19.4%,22.6%and 51.5%.The compounded modified ultrafine calcium carbonate has the best dispersibility in PP,and basically no agglomeration occurs.