相对分子质量对氨基磺酸系陶瓷浆料分散剂性能的影响

摘要

Five fractions of amino-sulfonic acid-based dispersant ASP with different relative molecular mass were obtained via ultrafiltration,and their influences on the application performances of ceramic slurry were analyzed, with the corresponding mechanism being explored by analyzing the adsorption amount and the Zeta potential of these five ASP fractions on black mud particles.The results indicate that (1 )the ceramic slurries added ASP fractions with high relative molecular mass (more than 10000)are of less outflow time,high fluidity,better dispersion and low thixotropy;(2)the adsorption amount of ASP on black mud particles may increase with the relative molecular mass of ASP,thus improving the Zeta potential between black mud particles and enhancing the steric effect,which makes ceramic particles disperse better;(3 )ASP without ultrafiltration possesses better dispersion property than each ultrafiltrated fraction,which means that the ASP fractions with different relative molecular mass work together to endow the ceramic slurry with best performance.This may be related to the improvement of adsorption amount due to the multi-layer adsorption of ASP fractions with different relative molecular mass on the ceramic particle surface.%通过超滤获得氨基磺酸系分散剂ASP的5种不同相对分子质量范围的级分，研究了不同级分对陶瓷浆料应用性能的影响，并结合黑泥颗粒上的吸附量及Zeta电位探讨其原因。研究发现：掺高相对分子质量级分（截留相对分子质量＞10000）的陶浆流出时间短，流动性和分散性好，触变性小；ASP相对分子质量的增加能提高其在黑泥颗粒表面的吸附量，使颗粒间的Zeta电位和空间位阻增大，从而能更好地分散；单一ASP超滤级分的分散性能均不如未分级的ASP，说明当不同相对分子质量ASP级分配合使用时，陶瓷浆体的性能达到最优，这可能与低、高相对分子质量ASP级分在陶瓷颗粒表面穿插多层吸附使得吸附量提高有关。