Resin compositions and methods of use thereof
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Embodiment 1
[0105] A functionalized colloidal silica (FCS) pre-dispersion was prepared. A functionalized colloidal silica pre-dispersion was prepared by combining the following steps: 935 g of isopropanol (Aldrich) was slowly added with stirring to 675 g of 34 wt %, 20 nm SiO 2 Granular hydrous colloidal silica (Nalco 1034A, Nalco Chemical Company). Subsequently, 58.5 g of phenyltrimethoxysilane (PTS) (Aldrich) dissolved in 100 g of isopropanol were added to the stirred mixture. The mixture was then heated to 80°C for 1-2 hours to obtain a clear suspension. The resulting suspension of functionalized colloidal silica was stored at room temperature. Preparation of various SiO 2 The dispersion was used in Example 2 at a content (10% to 30%).
Embodiment 2
[0107] A dispersion of functionalized colloidal silica in epoxy resin was prepared. 540 g of each predispersion prepared in Example 1 was charged into a 2000 ml round bottom flask. Table 1 below shows other pre-dispersion compositions. 1-Methoxy-2-propanol (750 g) was then added to each flask. The resulting functionalized colloidal silica dispersion was vacuum stripped at 60°C and 60 mmHg to remove 1 L of solvent. The vacuum was slowly reduced and the solvent was continuously removed with good stirring until the weight of the dispersion reached 140 g. Transparent phenyl-functionalized colloidal silica dispersion containing 50% SiO 2 And no precipitated silica. The dispersion is stable for more than three months at room temperature. The results in Table 1 show that in order to prepare concentrated and stable FCS dispersions in 1-methoxy-2-propanol (Dispersions 1-5), a certain amount of phenyl functionality is required. The content of functional groups can be adjusted to o...
Embodiment 3
[0113] A dispersion of capped functionalized colloidal silica in epoxy resin was prepared. 5.33 g of epoxy cresol novolac (ECN 195XL-25, obtained from Sumitomo Chemical Co.), 2.6 g of novolac hardener (Tamanol 758, obtained from Arakawa Chemical Industries) was heated to about 50°C. To 10.0 g of the FCS dispersion was added dropwise 7.28 g of a portion of the solution (see Table 1 above, item #3, 50% SiO in methoxypropanol) at 50°C while stirring 2). The clear suspension was cooled and a catalyst solution of N-methylimidazole, 60 microliters of a 50% w / w solution in methoxypropanol was added under stirring. The clear solution was directly used to cast a resin film for characterization or stored at -10°C. Other films were prepared using different amounts of different catalysts and certain variables of epoxides, as listed in Table 2 below showing the final resin composition.
[0114] Films were cast by dispersing a portion of the epoxy-silica dispersion on a glass plate, the...
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