奈米化塗料級絹雲母顏料研磨之探討

Preparation for the Nano-Sericite Coating Colors Pigment through Mechanical Grinding

林曉洪(Sheau-Horng Lin) ； 賴仁堯(Jen-Yao Lai) ； 王秀華(Hsiu-Hwa Wang)

《中華林學季刊》 39卷1期 (2006/03) Pp. 93-102

https://doi.org/10.30064/QJCF.200603.0008

摘要

塗布紙所用塗料中占最大比例者非顏料莫屬，其特質若何對輕塗紙性質之影響至大。本研究以攪拌式研磨機研磨產自台灣台東絹雲母水洗原礦，研製具高比表面積、微小粒徑及形狀平比等特質之奈米絹雲母，測試其粒徑變化，探討與他種顏料使用結果之異同，並分析研磨後之污染物種類、含量及去除途徑。絹雲母之粒徑隨研磨時間延長而減小。較大粒徑磨球(1mm)對絹雲母粒徑之縮減效果，不如小粒徑者(0.3mm)。礦漿中鉀離子之游離量隨絹雲母粒徑減少而增加。本研究所得絹雲母最小粒徑約101.9nm，厚2-3nm，顯示可以傳統式研磨獲致奈米級顏料。研磨後主要污染物為鐵及鉻，次要污染物為鈦及鎳。以草酸與硝酸溶液皆可除去鐵污染物，而0.5M 草酸之效果優於5%硝酸溶液者。鐵含量可由3.5%降至0.3%；鉻離子含量則由0.20%降至0.043%。

關鍵字

機械研磨 ； 奈米級絹雲母 ； 顏料 ； 粒徑 ； 絹雲母

並列摘要

Pigments are major component of the coating colors. The objective of this study is to develop nano-grade sericite as a new pigment for light weight coated (LWC) paper. The grade sericite, originally produced in Taitung, Taiwan, was grinded in a conventional ball mill to achieve nano-grade particles of high specific surface area, high aspect ratio. Variation of particle size and contaminants derived from milling were analyzed before implementing the pollutant elimination process. Milling balls with larger diameter (1mm) displayed less significant effect on size reducing than the smaller ones (0.3mm). The amount of free potassium ion in the slurry increased with reducing particle size of sericite. The smallest particle size obtained in this study is approximately 102nm, with thickness of about 2-3nm. Nano-grade sericite can be produced through the mechanical grinding process used in this study. Iron and chromium were the major contaminants found in the mill used, followed by titanium and nickel. Oxalic acid and nitric acid solution were found capable of removing iron and chromium. Oxalic acid of 0.5M showed better removing result than 5% nitric acid solution. Iron remnant was found decreasing from 3.5% to 0.31%, while chromium decreased from 0.2% to 0.043%.

並列關鍵字

Mechanical grinding ； Nano-sericite ； Pigment ； Particle size ； Sericite