27306-90-7Relevant articles and documents
Efficient concrete foam stabilizer and preparation method thereof
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, (2021/07/17)
The invention discloses an efficient concrete foam stabilizer and a preparation method thereof, according to the efficient foam stabilizer, polyol is subjected to an esterification reaction to form ester bonds, and the ester bonds are connected with amphiphilic side chains, and the number of the amphiphilic side chains is 3-7; one end of the amphiphilic side chain is a hydrophobic chain segment, and the other end of the amphiphilic side chain is a hydrophilic unit; wherein the hydrophobic chain segment is an alkyl chain (R) with 8-14 carbons, and the hydrophilic unit is 2-10 ethylene oxide units. The efficient concrete foam stabilizer is a multi-chain type surfactant, and the multi-chain type surfactant is hydrolyzed under the alkaline condition to release an air-entraining type surfactant. The efficient concrete foam stabilizer has an excellent effect of stabilizing the air content of concrete, meanwhile, hardened concrete has a better pore structure, and the hardening strength of the concrete cannot be greatly influenced.
SKIN CLEANSER COMPOSITION
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Page/Page column 0063; 0064; 0065; 0074; 0075; 0076, (2015/01/18)
A skin cleansing composition, comprising the following components (A) and (B): (A) from 0.1 to 30% by mass of an alkyl ether carboxylic acid or a salt thereof represented by the formula (1): wherein, R1 represents an alkyl group having 4 to 22 carbon atoms, n represents a number of from 0 to 20, and M represents a hydrogen atom, alkali metal, alkaline earth metal, ammonium, or organic ammonium, wherein, R1 has an average carbon number of from 10.8 to 12.8 and the average value of n is from 2.5 to 3.4, and wherein, the alkyl ether carboxylic acid or the salt thereof contains a component in which n = 0 in an amount of from 9.6 to 27% by mass, and a component in which n = 1 and a component in which n = 2 in a total amount of 20% by mass or more and less than 40% by mass, and (B) from 0.1 to 30% by mass of a potassium salt or an alkanolamine salt of a fatty acid represented by the formula (2): wherein, R2 represents an alkyl group or an alkenyl group having 9 to 22 carbon atoms, and Y represents potassium or alkanolamine. ????????R1-O-(CH2CH2O)n-CH2-COOM?????(1) ????????R2-COOY?????(2)
Ceria supported gold-platinum catalysts for the selective oxidation of alkyl ethoxylates
Heidkamp, Katharina,Aytemir, Memet,Vorlop, Klaus-Dieter,Pruesse, Ulf
, p. 2984 - 2992 (2013/11/06)
This work covers the development of a ceria based AuPt catalyst for the selective aerobic oxidation of alkyl ethoxylates to their corresponding carboxylic acids. By optimizing metal loading and the Au to Pt ratio the activity of the catalyst could be increased significantly, while maintaining total selectivity. Although the choice of ceria as a support helped to suppress intermediate metal leaching, the catalyst still showed poor long-term stability in repeated batches. The cause for deactivation could finally be identified by TPR studies as over-oxidation. These suspicions were confirmed by a long-term stability study in continuous-mode. It proved to be possible to deactivate the catalyst on purpose by employing unfavourable oxidising reaction conditions, i.e. low substrate concentrations and excess oxygen. By avoiding such unfavourable conditions either in continuous-flow mode or in repeated batches, the long-term stability of the catalyst increased tremendously. A substrate screening of various ethoxylates showed that the catalyst was very well-suited to selectively oxidize a wide range of alkyl ethoxylates.
