- Method for preparing mercaptosilane in virtue of thiourea process
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The invention relates to a method for preparing mercaptosilane in virtue of a thiourea process, belonging to the technical field of fine chemical engineering. The method comprises the following steps:dropwise adding an alcoholic solution of thiourea into chloropropyl siloxy silane and dodecyl trimethyl phosphorus bromide, carrying out a condensation reaction and an aging reaction, and conductingstanding for layering to obtain a mercaptosilane product. According to the invention, an isomerization reaction is inhibited by adjusting reaction conditions; the consumption of thiourea is reduced; ethylenediamine is used as a neutralization initiator, so solid by-products can be greatly reduced; and a guanidine salt state can be changed, so a crude product and a salt can be better separated, operation is simplified, and yield is improved.
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Paragraph 0023-0025
(2020/09/30)
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- Synthesis method of 3- mercaptopropyltrialkoxysilane (by machine translation)
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The, invention belongs, to the technical, field of coupling agent synthesis, 3 - and belongs to 10%-15% the technical field of coupling agent synthesis, 3 - 3 . (by machine translation)
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Paragraph 0026; 0032-0036; 0041-0043
(2020/02/14)
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- Synthesis method of 3-mercaptopropyltrialkoxysilane
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The invention provides a synthesis method of 3-mercaptopropyltrialkoxysilane. The synthesis method of the 3-mercaptopropyltrialkoxysilane comprises the following steps: uniformly mixing sodium hydrosulfide with an ionic liquid, sequentially adding a phase transfer catalyst and chloropropyltrialkoxysilane, reacting, and removing impurities to obtain the 3-mercaptopropyltrialkoxysilane. According tothe synthesis method of the 3-mercaptopropyltrialkoxysilane, the ionic liquid is adopted as a solvent, the phase transfer catalyst is used for catalyzing sodium hydrosulfide and chloropropyltrialkoxysilane to prepare the 3-mercaptopropyltrialkoxysilane, the steps are simple, the yield is high, safety and environmental protection are achieved, industrial production is easy, and the practicabilityis high.
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Paragraph 0023-0057
(2020/12/14)
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- Method for preparing mercaptosilane coupling agent by using phase transfer catalyst
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The invention discloses a method for preparing a mercaptosilane coupling agent by using a phase transfer catalyst. Sodium hydrosulfide and halogenated alkyl alkoxy silane are used as raw materials, and a hydrocarbon organic solvent is adopted as a protective agent. The method comprises the following steps: carrying out synthetic reaction on the sodium hydrosulfide in a water phase and the halogenated organosilane dissolved in the hydrocarbon organic solvent by utilizing a phase transfer catalyst, separating a reaction product organic layer after the synthetic reaction is finished, performing distillation to remove the hydrocarbon organic solvent, and carrying out reduced pressure filtration and distillation to obtain the mercaptosilane coupling agent. The synthesis reaction is relatively complete, the product quality is relatively high, the yield of the prepared mercaptosilane coupling agent is greater than or equal to 93%, and the purity is greater than or equal to 99%; the process issimple, the synthesis reaction process is easy to control, tail gas can be recycled, and the safety of organic synthesis reaction is enhanced; the reaction requires a low temperature, and low requirements on equipment; the hydrocarbon organic solvent is recyclable; and the manufacturing cost is low.
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Paragraph 0025-0027
(2019/12/02)
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- Iridium-Catalyzed Hydrosilylation of Sulfur-Containing Olefins
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Hydrosilylation of various sulfur-containing olefins with (RO)3SiH has been achieved using iridium catalysts [IrX(cod)]2 (X = Cl, SPh). The catalysis is applicable to the chemoselective hydrosilylation of thioacetate, which enables the preparation of an industrially important silane coupling agent.
- Srinivas, Venu,Nakajima, Yumiko,Sato, Kazuhiko,Shimada, Shigeru
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supporting information
p. 12 - 15
(2018/01/12)
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- Process for manufacturing polysiloxane microcapsules that are functionalized and are not very porous
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A method is provided for encapsulating products that can have lipophilic or hydrophilic, including volatile, properties in a polysiloxane membrane that is particularly impervious. A method is also provided for evaluating the imperviousness of capsules. The present method includes the following steps: a) formation of droplets by an emulsion between an oily phase containing the product to be encapsulated and an acidic aqueous phase heated to around 50° C. and in the presence of surfactants; b) addition and hydrolysis of at least one silane in order to obtain a silanol; c) increasing the pH in order to start condensation of the silanol to form a first membrane around the droplets of the product to be encapsulated; d) lowering the pH; e) increasing the pH, optionally preceded by adding a silane, in order to obtain a new condensation of silanol around the droplets of the product to be encapsulated.
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Page/Page column 4
(2016/09/26)
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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 0070
(2014/02/15)
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- Preparation of monodispersed spherical titania-octadecylamine particles containing silane-coupling reagents
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Well-defined spherical titania-octadecylamine (titania-ODA) (titania: titanium dioxide) hybrid particles containing silane-coupling reagents including aminopropyl, sulfanylpropyl, octadecyl, and phenyl groups (molar Ti:silane-coupling reagent ratio of 50:1) were prepared by sol-gel reaction of titanium tetraisopropoxide with the aid of a flow reactor. Average particle sizes were 520, 380, 540, and 510 nm for aminopropyl, sulfanylpropyl, octadecyl, and phenyl group containing particles, respectively. ODA was removed by washing the as-synthesized products with acidic EtOH, resulting in the formation of organosilyl group containing nanoporous titania. The porosity was investigated by the nitrogen adsorption/desorption isotherms (BET surface area of 250 to 400 m2g-1) and the surface hydrophilicity/hydrophobicity is discussed based on the water and benzene vapor adsorption/desorption isotherms. Crystallization of anatase within the spherical particles is possible by postsynthetic hot water or hydrothermal treatment.
- Shiba, Kota,Sato, Soh,Ogawa, Makoto
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p. 1040 - 1047,8
(2020/08/24)
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- Catalyst for use in production of epoxide, method for producing the catalyst, and method for producing epoxide
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To provide an epoxide-production-use catalyst that is suitably used for producing an epoxide by partial oxidation of an unsaturated hydrocarbon, a catalyst in accordance with the present invention is obtained by fixing gold fine particles to a carrier containing an oxide containing at least one of titanium and zirconium, and has an acid quantity of not more than 0.1 mmol/g determined by the NH3-TPD method. Such a catalyst for epoxide producing use can be produced by, for instance, fixing gold fine particles to a carrier having an acid quantity of not more than 0.15 mmol/g. The catalyst for epoxide producing use arranged as above is preferably used as a catalyst in partial oxidation of an unsaturated hydrocarbon to produce a corresponding epoxide.
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- Nucleic acid-coupled colorimetric analyte detectors
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The present invention relates to methods and compositions for the direct detection of analytes and membrane conformational changes through the detection of color changes in biopolymeric materials. In particular, the present invention provide for the direct colorimetric detection of analytes using nucleic acid ligands at surfaces of polydiacetylene liposomes and related molecular layer systems.
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- Method of manufacturing 3-mercaptopropylalkoxy silane
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After reacting sodium sulfide anhydride and hydrogen sulfide, 3-halopropylalkoxy silane represented by the general formula is added reacted, wherein X denotes Cl or Br; R denotes a methyl, ethyl or propyl group wherein R's can be all identical or different from each other; and "a" denotes an integer 1, 2 or 3.
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- Process for the preparation of mercaptosilanes
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Mercaptosilanes are prepared from haloorganylsilyl compounds and an alkali metal hydrogen sulfide in the presence of a polar, aprotic medium.
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- ELECTRONIC SPECTRA AND ELECTRONIC STRUCTURE OF TRIALKOXYSILYLALKANETHIOLS
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The ultraviolet absorption spectra of solutions of trialkoxysilylalkanethiols (RO)3Si(CH2)nSH (R=CH3, C2H5; n=1, 2, 3) and also of CH3Si(OC2H5)3 and C2H5Si(OC2H5)2 in heptane and acetonitrile were obtained in the region of 4.0-5.3x106 m-1.Analysis of the obtained photoelectron spectra of the triorganosilylalkanethiols X3Si(CH2)nSH (X=CH3, OCH3; n=1, 3) showed that the first photo-ionization potentials of the trialkoxysilylalkanethiols are lower than the values for the corresponding methyl derivatives.This is due to the participation of the n electrons of the oxygen atom of the methoxyl groups in destabilization of the highest occupied molecular orbital.An empirical and quantumchemical interpretation of the obtained spectra is given.
- Ermakov, A. I.,Kirichenko, E. A.,Makrushin, N. A.,Vlasova, N. N.,Maroshina, M. Yu.,Voronkov, M. G.
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- Organosilicon compound having polysulfide linkages and a rubber composition comprising the same
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The novel organosilicon compound of the invention has two polysulfide linkages in a molecule and is represented by the general formula in which R1 is an alkyl group having from 1 to 4 carbon atoms, R2 is a divalent hydrocarbon group having from 1 to 10 carbon atoms, R3 is a divalent hydrocarbon group having from 2 to 10 carbon atoms or a divalent hydrocarbon group additionally containing one or more of the linking units of the formula --O-- or --CO--O-- in the structure and X is a positive integer of from 2 to 6. The compound is useful as an additive in a rubber composition based on natural rubber or a diene-based synthetic rubber and a non-carbon inorganic filler to greatly improve the mechanical properties of the vulcanizate without increasing the Mooney viscosity of the unvulcanized rubber composition.
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- Organosilane esters having glycol ether moieties
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The present invention relates to new organosilane esters which can be characterized by the formula Y-(CH2)n Si(CH3)p -Xm Z3-(m+p). In this formula, Y represents either a substituted or unsubstituted amino group, or it represents the mercapto moiety or the moiety STR1 X represents an alkoxy group with 1 to 4 carbon atoms and Z a glycol ether moiety. The index n can assume the numerical values from 1 to 3, m can be 0 or 1 and p can be 0 or 1 or 2, on the condition that m+p is equal to or less than 2. The new silanes yield very stable hydrolyzates and have good adhesion-improving properties. They are therefore particularly well suited for use in sealing compositions.
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