Reference

Organic hydroxy silicate compounds and their condensation products

Blount, David H. (USA ). U.S. US 4139549 13 Feb 1979,5 pp. Cont.-in-part of U.S. 4,011,253. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07F007-18; C07F007-04. NCL: 260448800R. APPLICATION: US 75-589626 23 Jun 1975. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Section cross-reference(s): 29 A dry granular alkali metal metasilicate is treated with a concd. acid or acidic H-contg. salt to produce white granular silicic acid (I) [1343-98-2] compds. which react chem. with polyols in the presence of alk. compd. catalysts to give products useful in coatings and foams. Thus, Na metasilicate pentahydrate [10213-79-3] was treated with H2SO4 [7664-93-9] to give I, which was treated with glycerol (II) [56-81-5] in the presence of Na2CO3 [497-19-8] to give glycerol silicate (III) [69279-64-7]. Heating III just below the b.p. of II for 10-30 min gave a brown polymer (IV) [70234-86-5]. Heating III with phthalic anhydride have a copolymer [70234-88-7] useful as a protective coating for wood. Treating IV with TDI at 90° for 30-90 min gave a foam; dissoln. of this foam in HOAc and application to wood also gave a protective coating.

Continuous manufacture of sodium metasilicates

Continuous manufacture of sodium metasilicates. Villarroya Palomar, Alejandro; Cola Palau, Luis; Perez Villarroya, Antonio (Industrias Quimicas del Ebro S. A., Spain). Span. ES 549886 A1 16 Apr 1986, 13 pp. (Spain) CODEN: SPXXAD. CLASS: ICM: C01B033-32. APPLICATION: ES 85-549886 12 Dec 1985. DOCUMENT TYPE: Patent CA Section: 49 (Industrial Inorganic Chemicals) A soln. of Na metasilicate pentahydrate (I) is powd. at 80-90° on a powder of the same metasilicate in a small drum app. with smooth lower side and contg. a finned device in the mouth of the outlet to facilitate release of the product. Crystals with different amts. of crystn. water are crystd. and cooled on transport sieves depending on soln. concn. and temp. 10213-79-3 is the cas registry number of certain chemical which is used as reagents here. I crystals with particle size <0.2 mm were sprayed from a distance of 0.6 m with a soln. at 80-90° of I with compn. SiO2 28.75, Na2O 29.35, and water 41.9-42.1%, mixed in a drum, and collected on a sieve moving at 1 m/16 s to crystallize as I at 50° and cool to room temp. The crystals with the desired size are removed and the remaining crystals are recycled. .