| 초록 |
In preparation of self-repairing polymer-modified waterproofing asphalt-montmorillonite(MMT) composite, silylation-modification characteristics of cation(Na+) exchanged K-10(Na-MMT-K) using 3-aminopropyltriethoxysilane(APS) were studied and the optimal conditions of its silylation-modification process were proposed by use of the results of XRD analysis on silylation-modified Na-MMT-K(S-Na-MMT-K) under various conditions. According to XRD results, it was confirmed that peaks of Na-MMT-K were simultaneously consistent with those of K-10 and natural or Ca-MMT modified Na-MMT. Similarly, S-Na-MMT-K was observed to have two basal spacings(d001), among which the area-ratio of a secondary (001) peak(2θ=3.9-4.2°) to a primary (001) peak(2θ～8.838°) was suggested to be a criterion to represent a degree of APS silylation-modification. Then, the optimal conditions on APS-stirring period prior to APS-MMT reaction, APS-MMT reaction period, APS concentration and reaction temperature at the highest area-ratio were turned out to be 20 min, 2-3 hr, 7.5 %w/v and 50℃, respectively. |
