- Silicone sealant cross-linking agent and its preparation method and application
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The invention discloses a silicone sealant cross-linking agent, and a preparation method and an application of the silicone sealant cross-linking agent. The preparation method comprises the steps that long-chain alkyl trichlorosilane serves as a cross-linking agent precursor and reacts with a remover, and then the cross-linking agent is obtained. Long-chain alkyl trichlorosilane is C6-C18 alkyl trichlorosilane, and the cross-linking agent is applied to preparation of a silicone sealant. According to the cross-linking agent, long-chain alkyl is added and exerts a plasticizer effect, and in a silicone sealant preparation process, long-chain alkyl is bonded in a high molecular material by a chemical bond, so that the prepared sealant is free from leaked oil pollution.
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Paragraph 0029-0032
(2017/03/17)
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- An Easily Accessed Nickel Nanoparticle Catalyst for Alkene Hydrosilylation with Tertiary Silanes
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The first efficient and non-precious nanoparticle catalyst for alkene hydrosilylation with commercially relevant tertiary silanes has been developed. The nickel nanoparticle catalyst was prepared in situ from a simple nickel alkoxide precatalyst Ni(OtBu)2?x KCl. The catalyst exhibits high activity for anti-Markovnikov hydrosilylation of unactivated terminal alkenes and isomerizing hydrosilylation of internal alkenes. The catalyst can be applied to synthesize a single terminal alkyl silane from a mixture of internal and terminal alkene isomers, and to remotely functionalize an internal alkene derived from a fatty acid.
- Buslov, Ivan,Song, Fang,Hu, Xile
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supporting information
p. 12295 - 12299
(2016/10/13)
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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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- Method for Attachment of Silicon-Containing Compounds to a Surface and for Synthesis of Hypervalent Silicon-Compounds
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A method for inducing a hypervalent state within silicon-containing compounds by which they can be chemically attached to a surface or substrate and/or organized onto a surface of a substrate. The compounds when attached to or organized on the surface may have different physical and/or chemical properties compared to the starting materials.
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- METHOD FOR EXTENDING LONG-TERM ELECTRICAL POWER CABLE PERFORMANCE
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An improved method for imparting excellent long-term dielectric performance to an in-service electrical cable section having a stranded conductor surrounded by a conductor shield encased in a polymeric insulation and having an interstitial void volume in the region of the conductor, the cable section having an average operating temperature T. The method comprising injecting a dielectric enhancement fluid composition into the interstitial void volume, the composition comprising at least one component selected from: (1) a water-reactive material selected from an organosilane monomer, the above organosilane monomer wherein at least one of the water-reactive groups has been substituted with a condensable silanol group, an oligomer of the above organosilane monomer, or a co-oligomer of the above organosilane monomer, the organosilane monomer having a diffusion coefficient at least about 15 times greater than the diffusion coefficient of its corresponding tetramer;(2) a water-reactive material similar to (1) having at least one group attached to silicon comprising 7 to about 20 —CH2— units;(3) a non-water-reactive organic material which has a diffusion coefficient of less than about 10?9 cm2/sec and an equilibrium concentration of at least about 0.005 gm/cm3 in the polymeric insulation, the above mentioned diffusion coefficients and equilibrium concentration being determined at temperature T; or(4) an organic compound having an equilibrium concentration in the polymeric insulation at 55° C. which is less than 2.25 times the equilibrium concentration at 22° C.
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- Syntheses and characteristics of long-chain hydroxy-, methoxyalkylsilanes and glucopyranosides
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Syntheses of long-chain hydroxy-, methoxyalkylsilanes of the type (RSi(CH3)2OH, R(m)SiY(4-m) with R = C12H25, C18H37 and Y = OH, OMe, m = 1, 2, 3) (5, 6, 7a-c, 8a-c, 9a-c, 10a-c) and alkylsilyl glycopyranosides (13, 14, 15a-c, 16a-c) are reported. Hydroxyalkylsilanes (5, 6, 7a-c, 8a-c) were prepared by the hydrolysis of alkylchlorosilanes (1a-c, 2a-c, 3, 4) with NaHCO3-H2O in diethyl ether. Alkylchlorosilanes 1a-c and 2a-c react with KOMe in n-hexane to give methoxyalkylsilanes 9a-c and 10a-c, respectively. Alkylchlorosilanes 1a-c, 2a-c, 3 and 4react direct with 2,3,4,6-tetra-O-acetyl-α/β-D-glucopyranose 12 in CH2Cl2 to give alkylsilyl glucopyranosides 13, 14, 15a-c and 16a-c, respectively.
- Ahmed Aisa, Ali Muhamed,Richter, Heinrich
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p. 168 - 175
(2007/10/03)
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