浙江化工
浙江化工
절강화공
ZHEJIANG CHEMICAL INDUSTRY
2013年
9期
18-22
,共5页
SiO2溶胶%溶胶-凝胶过程%黏度%胶粒粒径%胶凝时间%生长模式
SiO2溶膠%溶膠-凝膠過程%黏度%膠粒粒徑%膠凝時間%生長模式
SiO2용효%용효-응효과정%점도%효립립경%효응시간%생장모식
silica sol%sol-gel process%viscosity%colloidal particle size%gelation time%growth modes
以硅酸钾为硅源，用激光纳米粒度仪及乌氏黏度计分别测定了酸性（pH=4.05）条件下不同浓度的SiO2溶胶胶凝过程中黏度和粒径随时间的变化。实验结果及动力学分析表明：从溶胶到凝胶的整个胶凝过程，分散相（胶粒）生长按两种模式进行。在胶凝的前期，胶粒的生长主要是通过多聚体与胶粒之间的缩聚反应进行，由此引起的黏度随时间的变化符合线性方程η=η0+kt；在胶凝中后期，胶粒的生长主要是通过大颗粒胶粒（团簇）之间的凝胶化生长过程进行，由此引起的黏度随时间的变化符合线性方程lnη=A+k’ln|1-t/Tg|。
以硅痠鉀為硅源，用激光納米粒度儀及烏氏黏度計分彆測定瞭痠性（pH=4.05）條件下不同濃度的SiO2溶膠膠凝過程中黏度和粒徑隨時間的變化。實驗結果及動力學分析錶明：從溶膠到凝膠的整箇膠凝過程，分散相（膠粒）生長按兩種模式進行。在膠凝的前期，膠粒的生長主要是通過多聚體與膠粒之間的縮聚反應進行，由此引起的黏度隨時間的變化符閤線性方程η=η0+kt；在膠凝中後期，膠粒的生長主要是通過大顆粒膠粒（糰簇）之間的凝膠化生長過程進行，由此引起的黏度隨時間的變化符閤線性方程lnη=A+k’ln|1-t/Tg|。
이규산갑위규원，용격광납미립도의급오씨점도계분별측정료산성（pH=4.05）조건하불동농도적SiO2용효효응과정중점도화립경수시간적변화。실험결과급동역학분석표명：종용효도응효적정개효응과정，분산상（효립）생장안량충모식진행。재효응적전기，효립적생장주요시통과다취체여효립지간적축취반응진행，유차인기적점도수시간적변화부합선성방정η=η0+kt；재효응중후기，효립적생장주요시통과대과립효립（단족）지간적응효화생장과정진행，유차인기적점도수시간적변화부합선성방정lnη=A+k’ln|1-t/Tg|。
Viscosity and colloidal particle size in SiO2 sol-gel process with different concentration of potassium silicate have been measured by the Laser nanometer particle size analyzer and Ubbelohde viscometer. The experiment results and dynamic analysis indicate that the growth of dispersed phase (colloidal particle) was in accordance with two different modes. At the early stage of the gelatinzation, the growth of colloidal particles mainly through the condensation reaction between polymer and colloidal particles.And the viscosity changing with time fitted the linear equation,which isη=η0+kt. In the middle and later periods of the gelatinzation, the growth of colloidal particles was in accordane with the growth of gelation by the condensation reaction between large colloidal particles (clusters).And the viscosity changing with time fitted the linear equation,which is lnη=A+k’ln|1-t/Tg|.
