- Synthetic method of linear dihydric alcohol
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The invention discloses a synthetic method of linear dihydric alcohol. The synthetic method comprises the following steps: (1) carrying out hydrosilylation reaction on alpha-olefin and siloxane to obtain alkyl siloxane; (2) carrying out hydroxymethylation reaction on alkyl siloxane, organic metal alkali and a hydrogen acceptor to obtain silyl alcohol; and (3) carrying out oxidation reaction on the silyl alcohol, fluorine-containing metal salt and peroxide to obtain the linear dihydric alcohol. The method has the advantages of mild process, easily available raw material sources, no need of post-treatment after the reaction is completed, capability of being directly used for the next reaction, simplification of the process flow, high conversion rate, high selectivity, low cost and suitability for large-scale production.
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Paragraph 0104-0106; 0125-0130
(2021/09/01)
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- N-propyl silicate water-proof method for the preparation of
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The invention discloses a preparation method for a propyl silicate waterproof agent and belongs to the technical field of waterproof agents. According to the preparation method disclosed by the invention, a by-product, namely, propyltrichlorosilane in a process for producing a silane coupling agent, namely, gamma-chloropropyl trichlorosilane, is reacted with methanol in a molar ratio of 1: (3 to 5) to prepare propyltrimethoxysilane, then the propyltrimethoxysilane is hydrolyzed to obtain propylsilanol, and the propylsilanol is reacted with strong base under the suppression protection of methanol to prepare the propyl silicate aqueous solution-type waterproof agent. The preparation method disclosed by the invention is simple in preparation process, short in reaction time, and adequate in reaction; the yield of propyl silicate is greater than 75%; the generation of wastewater and solid wastes in the preparation process is avoided, so that pollution to environment is avoided.
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Paragraph 0019
(2017/04/08)
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- COSMETIC TREATMENT METHOD COMPRISING THE APPLICATION OF A COATING BASED ON AN AEROGEL COMPOSITION OF LOW BULK DENSITY
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The present invention relates to a cosmetic treatment method comprising the formation of a coating on keratin fibres characterized in that it comprises: 1) the preparation of an aerogel precursor composition comprising:—at least one organic solvent chosen from acetone, C1-C4 alcohols, C1-C6 alkanes, C1-C4 ethers, which may or may not be perfluorinated, and mixtures thereof and at least one precursor compound that contains:—at least one atom chosen from silicon, titanium, aluminium and zirconium,—at least one hydroxyl or alkoxy function directly attached to the atom chosen from silicon, titanium, aluminium and zirconium by an oxygen atom, and,—optionally an organic group directly attached to the atom chosen from silicon, titanium, aluminium and zirconium by a carbon atom, 2) the removal of the solvent or solvents resulting in the formation of an aerogel composition having a bulk density less than or equal to 0.35 g/cm3, 3) the application to the keratin fibres of the aerogel composition resulting from step 2) or of the aerogel precursor composition resulting from step 1). Advantageously, the molar ratio between the precursor compounds and the solvent is at most 1/20.
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Paragraph 0067
(2014/02/15)
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- Rapid assembly of explicit, functional silicones
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The impressive surface activity of silicones can be enhanced by the incorporation of hydrophilic organic functional groups and polymers. Traditional routes to such compounds, which typically involve platinum-catalyzed hydrosilylation, suffer from incompatibility with certain functional groups. B(C6F5)3-catalyzed condensation of hydrosilanes with alkoxysilanes offers new opportunities to prepare explicit silicone structures. We demonstrate here that conversion of alcohols to silyl ethers competes unproductively with alkoxysilane conversion to disiloxanes. By contrast, a wide range of structurally complex alkyl halide and oligovinyl compounds can be readily made in high yield. Thermal 3+2-cycloadditions and thiol-ene click reactions are used to convert these compounds into surface active materials. The Royal Society of Chemistry.
- Grande, John B.,Gonzaga, Ferdinand,Brook, Michael A.
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experimental part
p. 9369 - 9378
(2011/01/07)
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- PROCESS FOR MAKING HALOORGANOALKOXYSILANES
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A haloorganoalkoxysilane is prepared by reacting an olefinic halide with an alkoxysilane in which the alkoxy group(s) contain at least two carbon atoms in a reaction medium to which has been added a catalytically effective amount of ruthenium-containing catalyst and a reaction-promoting effective amount of an electron-donating aromatic compound promoter. The process can be used to prepare, inter alia, chloropropyltriethoxysilane, which is a key intermediate in the manufacture of silane coupling agents.
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Page/Page column 11-12; 18
(2008/06/13)
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- Process for making haloorganoalkoxysilanes
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A haloorganoalkoxysilane is prepared by reacting an olefinic halide with an alkoxysilane in which the alkoxy group(s) contain at least two carbon atoms in a reaction medium to which has been added a catalytically effective amount of ruthenium-containing catalyst and a reaction-promoting effective amount of an electron-donating aromatic compound promoter. The process can be used to prepare, inter alia, chloropropyltriethoxysilane, which is a key intermediate in the manufacture of silane coupling agents.
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- Process for preparing low-chloride or chloride-free alkoxysilanes
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A process for preparing an alkoxysilane with an acidic chloride content of less than 10 ppm by weight, comprising: reacting a chlorosilane with an alcohol in a water-free and solvent-free phase to form a product mixture containing alkoxysilane and residual acidic chloride, with removal of resultant hydrogen chloride from the product mixture, then adding liquid or gaseous ammonia, in an amount corresponding to a stoichiometric excess, based on the content of acidic chloride, to form an ammonia-containing product mixture, treating the ammonia-containing product mixture at a temperature between 10 and 50 DEG C., wherein the ammonia and acidic chloride undergo neutralization, to form a crude product, and optionally, then separating off a salt formed in the course of neutralization, from the crude product, and recovering the alkoxysilane by distilling the crude product.
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- Organosilicon compound and acryl compound
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An organosilicon compound represented by the general formula: STR1 where R1 represents a substituted or non-substituted monovalent hydrocarbon group, X represents a chloromethyl group, (meth)acryloxymethyl group, glycidoxymethyl group or aminomethyl group, Y represents a hydrolyzable group or hydroxyl group, n represents a number of 1, 2 or 3. The compound is useful, for example, for the improvement of adhesion between the organic and inorganic materials.
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