Process can be expres sioh 2 o si2ohto 2 h20sioh5 of

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Unformatted text preview: es [Si(OH) 2 O [ Si2(OH)to]-2 [(H20)Si(OH)5]-+ of soluble metasilicate may be represented as follows: 6] " OH [(H- 2 O)Si(OH) 5 ] - + [Si(OH) 62] -2 +2H2O (6) (7) following way: polymerization process can be expr OH (pH = 13 .6) [(H ~ ''Ys[Si2(OH)5 ]_ +H 0 2 0)Si(OH) 5 ] - OH Si(OH)4 + OH - + +H [(H 2 O)Si(OH) 52 ]O + [Si(OH) 6] -2OH- 2O (6) 13 .6) following''Ys[Si2(OH)5 ]_2 +H2 0 way: OH (pH = [Si(OH)6] -2 + H [(H20)Si(OH)5]-+ (7) On the other hand, when a solution of a soluble 2[S i(OH)6]-2 [ 10 OH [(H 2 0)Si(OH) 5 ] - ~ Si(OH)42 + OH - + H 2O (pH—Si2(.9) )to]-2 + [Si(OH)6]-2)x +OHO 0H 1 /x(S iO2 --sp.- 2 H O silicate,13 .6)otheris always highly alkaline, is which hand, when a solution of a soluble On the OH- (pH = ''Ys[Si2(OH)5 ]_ +H2 0 [(H 2(7) 0)Si(OH) 5 ] -2[S i(OH)6]-2 ~ OH, Si(OH)4 + OH - +l OH, OH OHis neutralized by acid to a pH below 10 .5, the silicate OH OH silicate, which is always highly alkaline, OH iO2)x + H2O OH H 2O (pH— 10.9) 1 /x(S above th [ ions decompose to a pH below 10which silicate(8) theOH,0H and next formulations, for ;S silicic4 acid,- + the then In + OH .5, neutralized 5 ] - acid to OH [(H 2 0)Si(OH)by ~ Si(OH) OH 1 OH OH iO2)x + .OHOH Si H explanation (pH 1 /x(S "OWphenomena in t (8) Si 2O OH — 10.9) of polymerizationH2O OH' polymerizes to silica. to silicic acid, which then The OH neutralization of a solution OH, OH, l OH, .OH'OH` 2 +OH 20H ions decompose 1 O the + H2system, the coordination number O In metasilicate maynext x + H2O as follows: for of soluble10.9) be H 2O (pH— theto silicaSi 1 /x(S iO2)formulations, (8) OH OH ] 2 + ] -2 ,O polymerizes above .and OH represented ofSi solution [ ;Si, The neutralization a silica-water " OH for the 20H In OH OH the above and next explanation of polymerization phenomena in the proposed to "OW formulations, silicon is OH' be of soluble metasilicate may be represented as follows: 'OH` OH 6. OH " OH OH OH of of polymerization phenomena in 'OH silica-water H 2 O and next coordinationfor the Further studies [6], show that abovethe 13 number 20W In ] -2 above formulations, explanation [Si(OH)6the+ system, the[(H20)Si(OH)5]-+ OH OH OH OH OH ,OH pH OH Liquid sodium of polymerization phenomena silica-water system, the coordination number of explanation +silicate in the silicon is ]p...
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