摘要:
Methods for removing deposits formed in the heat exchange tube of waste heat recovery boilers for glass furnaces in which sodium aluminum silicate fine particles are introduced into the waste gases before they enter the heat exchange tubes.
摘要:
An elastomeric sealing gasket assembly comprising a sealing compound layer between a removable carrier paper and a flexible cover film can be kept permanently elastic and, at the same time, withstand condiderable surface pressure by embedding substantially imcompressible spacer in the sealing layer.
摘要:
This invention is directed to a method for preparing foam inhibitors for aqueous systems, which comprises the steps of:(a) mixing a higher-molecular branched-chain primary alcohol or from about 18 to 30 carbon atoms with hydrophobic colloidal silica in an alcohol to silica ratio of from about 100:2 to 100:20;(b) heating the mixture from step (a) under stirring to temperatures of from about 100.degree. to 240.degree. C.; and(c) allowing the heated mixture from step (b) to cool to room temperature.This invention is also directed to the suds regulators prepared and their use in aqueous detergent systems.
摘要:
Organopolysiloxanes of the formula:(CH.sub.3).sub.3 Si--(OSiCH.sub.3 R.sup.1).sub.a --(OSiCH.sub.3 R.sup.2).sub.b --OSi(CH.sub.3).sub.3wherein R.sup.1 is a C.sub.6 -C.sub.10 alkyl group and R.sup.2 is the group--(CH.sub.2).sub.d COO (CH.sub.2 CHZ--O).sub.e --R.sup.3 ; and wherein R.sup.3 is a C.sub.1 -C.sub.6 alkyl group, Z is hydrogen or methyl, a is the whole number 28 to 36, b is the whole number 5 to 12, d is the whole number 8 to 12, and e is the whole number 1 to 24. These organopolysiloxanes are useful as antifoaming agents and are especially useful in aqueous paint compositions.
摘要:
A free-flowing, substantially silicone-free, powdery antifoaming composition for use in aqueous systems comprised of:(a) a liquid homogeneous mixture of a branched-chain primary C.sub.16 -C.sub.30 alcohol and hydrophobic-reacting colloidal silicic acid with a ratio by weight of alcohol:silicic acid of 100:2 to 100:20, as obtained by heating to 100.degree. to 240.degree. C. with agitation for a time sufficient to obtain a homogeneous mixture,(b) a water-insoluble wax in a ratio by weight of (a):(b) of from 3:1 to 1:3, and(c) a water-soluble powdered carrier where the components (a) and (b) are present on the carrier in homogeneous distribution, the powdered carrier being present in such an amount that a free-flowing product results.The primary alcohol of component (a) is preferably a Guerbet alcohol of the formula: ##STR1## A natural or synthetic paraffin wax or mixture of waxes with a congealing point in the range of 40.degree. to 120.degree. C. is used preferably as the wax (b). The carrier (c) is a salt that is compatible with the aqueous system, especially an alkali metal salt from the group of the phosphates, the polymeric phosphates, the borates, carbonates, silicates, sulfates or their mixtures, preferably sodium tripolyphosphate. The product is prepared by mixing the liquid alcohol/silicic acid mixture (a) with the wax (b) and the carrier (c) at temperatures above the congealing point of the wax, cooling of the homogeneous mixture to room temperature with continued mixing and crushing into a free-flowing powder. The antifoaming agent is preferably used in washing and cleaning products in amounts from 0.15% to 15% by weight.
摘要:
This invention relates to a foam inhibiting composition comprising:(a) from about 3 to 10 percent by weight of a polysiloxane-polyether block polymer of the formula ##STR1## wherein m is 0 or 1, n is a number of from 0 to 2, x is a number of from 20 to 100, and y is a number of from 5 to 30;(b) from about 65 to 85 percent by weight of a water-immisible oily substance selected from the group consisting of mineral oils, fatty oils, and fatty alcohols;(c) from about 5 to 30 percent by weight of at least one additional substance with a foam-inhibiting effect selected from the group consisting of polypropylene glycol-polyethylene glycol block polymers with a molecular weight of from about 1000 to 4000, their monoesters or diesters with fatty acids and hydroxy-fatty acids containing from 18 to 24 carbon atoms, and the monoesters and diesters of said fatty acids and hydroxy-fatty acids with hydroxystearyl alcohol;(d) from about 1 to 6 percent by weight of at least one emulsifying agent selected from the group consisting of polyglycol ether derivatives containing from 4 to 12 ethylene glycol ether groups adducted onto alkanols or alkenols with from 12 to 20 carbon atoms or alkylphenols with from 8 to 12 alkylcarbon atoms; and(e) from about 1 to 5 percent by weight of at least one alkaline earth metal soap or aluminum soap of fatty acid containing from 16 to 20 carbon atoms,based on the weight of the total composition, and the use of said composition in aqueous dispersions of synthetic resins, lacquers, and paints.
摘要:
Hydroxyalkane diphosphonic acids having the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## and their water-soluble salts; as well as the process of preparing the same.The compounds are excellent sequestering agents, especially for alkaline earth and earth metal ions. They are stabilizers for percompounds and are useful in the delaying of the setting times for gypsum. In addition, the compounds are useful in cosmetic preparations, such as toothpastes and mouthwashes where they prevent formation of tartar and plaque and are useful in therapy in the treatment of diseases related to the abnormal deposition or dissolution of difficultly soluble calcium salts in the animal body.
摘要:
In the process for the production of a long chain silane consisting essentially of reacting a hydrogen silane with a commercial oleic acid ester with a lower alkanol in the presence of a catalyst, at a temperature above 50.degree. C. and recovering said long chain silane, the improvement consisting essentially of utilizing a commercial oleic acid ester with a lower alkanol containing less than 4% by weight of poly-unsaturated compounds, as said oleic acid ester.