离心分层距离法——一种定量表征聚合物液体中矿物填料沉降性能的方法

CENTRIFUGAL STRATIFIED DISTANCE——A METHOD OF QUANTITATIVELY CHARACTERIZING THE SETTLING PROPERTIES OF MINERAL FILLERS IN POLYMER LIQUID

研究聚合物等高粘度液体中矿物填料的沉降性能，可以为新型绝缘灌注胶以及矿物材料研究与应用提供科学依据，根据斯托克斯公式和离心沉降速度公式以及高速旋转离心实验特点，对自然沉降时间计算公式进行推导，并根据绝缘灌注胶特点以及不同粒度微晶白云母在环氧树脂中高速离心沉降实验，总结出一种能够对聚合物等高粘度液体中矿物填料的沉降性能进行快速定量表征的离心分层距离法；实验结果表明：微晶白云母在E-51环氧树脂中的沉降速度和分层比例都分别与其粒度大小呈正比关系，1000目完全沉降（分层比例100％）需要7068．7d，其自然沉降速度为0．7×10^-7mm·s^-1，若要保持3个月内不发生明显的分层现象，应当采用1000目或更细小的粒度。

In order to provide science basis for research and application of the new insulating pouring sealant and mineral materials, the settling properties of mineral fillers in high viscosity liquid, such as polymer material,was studied in reference to the Stocks settling velocity formula, the centrifugal settling velocity formula and the features of high speed rotating centrifugal test, and the natural settling time formula was deduced. On the basis of features of insulating pouring sealant and high speed centrifugal settling test with different granularity micro-crystal muscovite in epoxy resin,a method of centrifugal stratified distance to get fast quantitative characterization for the settling properties of mineral fillers in high viscosity liquid was proposed and summarized. It was showed that settling velocity and stratification proportion of the micro-crystal muscovite in epoxy resin E-51 was related directly with the proportion of particles size respectively. It took 7 068. 7 days to settle completely for 1 000 mesh micro-crystal muscovite （stratification proportion 100%）, with natural settling velocity is 0.7 × 10^-7 mm · ^-1 1 000 mesh micro-crystal muscovite or less should be used to prevent the distinctly stratified phenomenon in three months.