Showing papers on "Sodium silicate published in 1976"

Manufacture of olefin polymers

Abstract: This invention relates to a process for the manufacture of olefin polymers by polymerization of monoolefins with the aid of a silicic xerogel/chromium trioxide catalyst obtained by (1) synthesizing a particulate silicic xerogel, (2) doping this xerogel with chromium trioxide or a chromium compound which converts to chromium trioxide under conditions of stage (3) and (3) maintaining the resulting product at an elevated temperature in a water-free oxygen-containing stream of gas. The characteristic feature of the process of the invention is that the silicic xerogel/chromium trioxide catalyst used is one obtained by (1) synthesizing the silicic xerogel in the first stage as follows: (1.1) taking an aqueous solution of a sodium silicate, (1.2) substituting substantially all of the sodium ions contained in said solution by hydrogen ions by means of an ion exchanger, (1.3) introducing a water-soluble aluminum salt into the resulting aqueous silicic acid solution, (1.4) adjusting the pH of the solution obtained in stage (1.3) to from 0.1 to 3.5, if necessary, (1.5) adjusting the solution obtained in (1.3) or (1.4) to a pH of from 4 to 12 by means of a nitrogen-base compound, (1.6) extracting the product forming the solid phase in stage (1.5) (silicic hydrogel) by means of an alkanol and/or alkanone until the organic liquid absorbs no more water and, finally, (1.7) drying the dehydrated gel saturated with organic liquid resulting from stage (1.6) (xerogel formation). This process makes it possible to obtain polymers having a satisfactory particle size distribution and a favorable melt index.

Contact lens cleaning solution

Abstract: Silicone and/or hydrophilic soft contact lenses are freed of proteinaceous and other deposits by rubbing them with a buffered, aqueous solution of a crystalline sodium silicate, and rinsing. Heavy encrustations or deposits remaining after the above treatment may be removed from the lenses by heating them in said solution, removing them and rinsing.

Enhanced oil recovery using alkaline sodium silicate solutions

Abstract: An enhanced oil recovery process for subterranean reservoirs wherein there is injected into the reservoir a relatively large slug of a dilute aqueous alkali metal silicate solution. It is optional to follow the said silicate solution with an aqueous drive fluid. In treating heterogeneous reservoirs, it is further optional to also inject a small slug of a dilute aqueous solution of an agent that reacts with the alkali metal silicate to form a gelatinous precipitate. In the latter instance a small spacer slug of water is injected between successive slugs of the reactant solutions to separate the reactants during injection.

Thermal barrier compositions

Abstract: A composition which is particularly adapted for coating structural surfaces to provide them with a thermal carrier to protect them from the detrimental effects of fire comprises an aqueous mixture of (a) lithium mica, (b) wollastonite, (c) aluminum trihydrate, (d) nepheline syenite, and (e) soda bicarbonate. The composition may be diluted with water to facilitate application. The composition may also contain raw vermiculite, sodium aluminum sulfate, borax, calcium sulfate, sodium silicate and other additives to improve the fireproofing, insulating and/or structural strength properties of the material.

Release coating for glass manufacture

Abstract: A composition and method of preparation are herein described for molten release and parting compositions adaptable for use in glass-forming operations. The novel composition comprises an aqueous dispersion of a mixture of a solid lubricant, a water-soluble silicate binder, a setting agent, and a water-soluble phosphate. A preferred composition comprises a mixture of flake graphite, boron nitride, sodium silicate, zinc oxide and potassium phosphate tribasic.

Built detergent compositions

Abstract: Dry powder laundry detergent compositions which contain an anionic, nonionic, ampholytic or zwitterionic synthetic detergent, a sodium carbonate, bicarbonate or sesquicarbonate, amorphous sodium silicate and sodium sulfate, used in certain ranges of proportions.

X-ray spectroscopic investigation of the structure of silica, silicates and oxides in the crystalline and vitreous state

Abstract: The Si Kα1,2 emission lines and their satellite lines α′, α3 and α4 were measured for several samples of vitreous silica (Suprasil W, Infrasil, Suprasil), sodium silicate glasses (8, 15, 20 and 25 wt% Na2O), and crystalline Mg2SiO4 (Forsterite). The observed shifts of the peak positions indicate a systematic increase of the electron density on the silicon atoms with increasing break-up of the SiO2 network by OH− or alkali ions. These results are compared with information from the corresponding Si Kβ and O K emission bands and also with the O K emission bands from quartz, MgO and Al2O3. They are discussed on the basis of the MO theory and are compared with the characteristic physical properties and structure of silica and silicate glasses. Both the O K and Si Kβ emission bands are closely related to the electronegativities of the relevant metal atoms of the oxides and glasses.

Foundry moulding materials

Abstract: A composition for making foundry moulds and cores of improved strength comprises a mixture of a granular refractory material, a sodium silicate binder and a polymeric resin material. The polymeric resin material is formed by heating together phenol, a carbohydrate and formaldehyde in the presence of a catalyst.

Forming highly absorbent, low bulk density sodium silicate by contacting with H{HD 2{B O{HD 2 {B and heating to about 45{20 {0 to 60{20 C

Abstract: Spheroidal aggregates of highly absorbent, low bulk density, readily soluble, high surface area, hydrated, amorphous alkali metal silicate are provided by contacting discrete alkali metal silicate particles with an aqueous solution of hydrogen peroxide, absorbing the peroxide into the alkali metal silicate hydrated structure and heating the silicate to destroy substantially all of the hydrogen peroxide.

Process for producing fluidized mordenite particles

Abstract: Process for forming a zeolite particle in the fluidizable size range from 20 to 150 micrometers. Acid-stable, molecular sieve zeolite mordenite is formed by mixing silica-alumina gel particles in the fluidized size range with sodium silicate, sodium hydroxide, sodium chloride, and mordenite seed crystals. For example, the mixture is reacted under autogenous pressure at 180° C for 24 hours.

Method of preparing shaped articles from polymerizable compositions

Abstract: A method for preparing polymerized products by spraying unsaturated polyester resin syrup, aqueous sodium silicate and a polymerization initiator for the unsaturated polyester resin syrup. The ingredients preferably are formed into sprays which are mixed by impingement. Alternatively the ingredients may be combined into a single spray. These sprays may include inert fillers in spray form. Preferably the sprays are impinged upon inert fillers including chopped fibrous reinforcements such as glass fibers.

Refractory furnace wall coating

Abstract: Refractory furnace wall coating composition comprising from about 45 to about 65% by weight of silicon carbide, from about 10 to about 15% by weight of stabilized zirconium oxide or bentonite, from about 5 to about 10% by weight of silicon dioxide, from about 3 to about 5% by weight of hydrolyzate of poly(ethyl silicate), from about 10 to about 20% by weight of sodium silicate or aluminum phosphate, the balance being water, is disclosed.

Method for treating lightweight, non-cementitious building material

Abstract: A method for treating a lightweight building material, the material comprising sodium silicate as a binder and an expanded inorganic aggregate. The building material is contacted with a reactive organo silane, the resulting treated building material is nonefflorescent.

Method of manufacturing granular detergents

Abstract: The present invention relates to a method of manufacturing granular detergents having good biodegradability, mildness to the skin, an appropriate breaking strength of the granules, a desired bulk density and a satisfactory free-flowability, by heating a detergent slurry and atomizing it in an ambient or cold atmosphere, wherein the detergent slurry employed is a mixture consisting of 10 to 30 wt.% of olefin sulfonate having 10 to 22 carbon atoms, 60 to 90 wt.% of sodium carbonate, sodium silicate and water and 0 to 30 wt.% of other well-known additives, and the ratio of said sodium carbonate, sodium silicate and water is in a specific range.

Glass formation and structure of Na2SSiO2 and Na2SB2O3 glasses

Abstract: Glass-forming regions of the systems Na 2 SSiO 2 and Na 2 SB 2 O 3 have been investigated in order to clarify whether Na 2 S could be substituted for Na 2 O in sodium silicate or borate glasses, and the results were interpreted in terms of the structures of silicate and borate glasses No difference was found in the glass-forming range of SiO 2 content between the Na 2 SSiO 2 and Na 2 OSiO 2 systems, and the red color of Na 2 SSiO 2 glasses suggests that the formation of polysulfides in the glass structure is probably due to the entrance of sulfur ions in the non-bridging sites of the glass network On the other hand, not all of the sulfur added to the glass batches could be retained in the Na 2 SB 2 O 3 glasses and the amount remaining in the glass products changed depending upon the amount of sodium ions in the glasses Only a trace of sulfur was observed in the glasses containing less than 13 mol% of Na 2 S in the batches, but the sulfur content in the glasses increased steeply with sodium content up to 35 mol%, reached the maximum and then decreased slowly with sodium content The insolubility of sulfur in the glasses with low sodium content was interpreted based on the compositional dependence of basicity of alkali-borate glasses, and the change in solubility of sulfur with sodium concentration was explained based on the well-known boron anomaly caused by the change in the coordination state of boron and on the formation of non-bridging oxygens or sulfurs in the glass structure

Thermal analysis of chromium(III) and chromium(VI) systems with silica and sodium silicate

Abstract: Sodium silicate, or a mixture of silica and sodium carbonate, reacts with chromium(III) oxide in the presence of oxygen to give sodium chromate, within the approximate temperature range 300–900°. Above 900° the reaction is reversed and chromium(III) oxide regenerated.

Process for selectively measuring sodium ions in solution

Abstract: The present invention concerns sodium silicate and sodium aluminosilicate glass compositions which contain specified proportions of tantalum oxide and glass electrodes made thereform, which are particularly sensitive to sodium ions in aqueous solutions containing sodium ions and other monovalent cations. These glasses represent an improvement over sodium aluminosilicate glass electrodes of the type disclosed in U.S. Pat. No. 2,829,090.

Sodium specific glass compositions and electrodes

Abstract: The present invention concerns sodium silicate and sodium aluminosilicate glass compositions which contain specified proportions of tantalum oxide and glass electrodes made therefrom, which are particularly sensitive to sodium ions in aqueous solutions containing sodium ions and other monovalent cations. These glasses represent an improvement over sodium aluminosilicate glass electrodes of the type disclosed in U.S. Pat. No. 2,829,090.

Sodium silicate hydrate prodn. - by adding an insoluble pigment to the solution prior to crystallisation

Abstract: Modified Na silicate hydrate of mole ratio Na2O:SiO2 = 1:1 to 1.5:1 is produced by crystallising the Na silicate hydrate in the presence of fine particles of pigments and or zeolite, which are insoluble in the hydrate. The prod. contains 0.01-1 wt.% of these fine particulate pigments and/or zeolites. Prod. is used for detergents and cleaning agents. Method does not require a costly drying treatment and the product is opaque, of white colour, if required, and does not tend to bake together. The pigments incorporated are of white colour such as TiO2, or of a mixt. of colours present in the modified Na silicate hydrate in an amt. of 0.01-1 wt.%. The rate of crystallisation is higher than that of known Na silicate solns. and the finely distributed pigment affects nucleation and growth of the nuclei. The product is easier to grind to powder.

Treating method of waste liquor of sodium silicate solution containing oils

Abstract: PURPOSE:A practical treating method wherein fixing treatment of silicic acid is applied to a sodium silicate-containing waste solutions in which machine oils and the like are admixed. After the treatment, both liquid and solid can be used effectively as alkali materials.

Gas-shielded-type coated arc welding electrode

Abstract: This invention relates to a gas shielded-type coated arc welding electrode, more particularly to the coated electrode consisting of a mild steel core and coating material which comprises 20 - 40% organic material by weight of a total coating material, and 5 - 25% anhydrous sodium silicate by weight of said of organic material wherein the molar ratio of SiO 2 /Na 2 O within said of anhydrous sodium silicate is 2.5 - 3.5. Such an electrode displays improved coating material moisture resistance and usability.