Abstract: Disclosed is a method of preparing colloidal silica, more particularly a method of producing high-concentration (10-55 wt %) colloidal silica by reacting water with a tetraalkyl orthosilicate (TMOS), tetraethyl orthosilicate (TEOS) based silane precursor as a starting material in the presence of a basic catalyst.

Abstract: A method for producing tetraalkoxysilane includes reacting a compound represented by Chemical Formula 1 below with an alkali metal at a molar ratio ranging from 1.0:1.0 to 1.0:1.1 and in the absence of a solvent to produce a basic catalyst represented by Chemical Formula 2 below; and mixing the basic catalyst represented by Chemical Formula 2, silicon metal, and an alcohol represented by Chemical Formula 3 below to produce tetraalkoxysilane: Chemical Formula 1 R1O(CHR2CH2O)n—H, Chemical Formula 2 R1O(CHR2CH2O)n-M, and Chemical Formula 3 R3OH, where M is alkali metal, R1 represents a C1-C5 linear hydrocarbon group or a C3-C5 branched hydrocarbon group, R2 represents H or a C1-C3 linear hydrocarbon group, R3 represents a C1-C2 alkyl group, and n is an integer of 2-3. Thus, it is possible to increase the proportion of the catalyst in the process, and to minimize production of impurities caused by solvent decomposition.

Abstract: The present disclosure relates to a method for producing tetraalkoxysilane continuously through direction of silicon metal with alcohol. In the method, a basic catalyst prepared in the absence of a solvent is used. Thus, it is possible to increase the proportion of the catalyst in the process, and to minimize production of impurities caused by solvent decomposition. In addition, it is possible to improve reaction efficiency and to simplify the purification process as compared to the method based on direct reaction according to the related art, and thus to produce tetraalkoxysilane with significantly higher cost efficiency as compared to the related art.

Abstract: The present invention relates to a solar cell having a wavelength converting layer formed of a polysilazane and a manufacturing method thereof to allow for low temperature sintering, to protect a wavelength converter from oxidation, degradation, and whitening, and thereby improve efficiency of the solar cell. The present invention provides for the solar cell including the wavelength converting layer which is formed by applying a coating solution containing a solvent, a polysilazane, and a wavelength converter onto a cell and an outer surface or inside of the cell, and then curing, and a manufacturing method of.

Abstract: There is provided a phosphor powder which includes a wavelength converting material and a silica-based inorganic substance surrounding the wavelength converting material and represented by the following Formula 1, wherein a content of a hydrosilyl group (Si—H) is greater than or equal to 10 ppm by weight, based on the total weight of the silica-based inorganic substance: wherein X represents oxygen (O) or an amine group (NH), Y represents hydrogen (H), a hydroxyl group (OH), an amino group (NH2), or an alkyl group containing heteroelements, and the heteroelements include at least one selected from the group consisting of phosphorus (P), nitrogen (N), sulfur (S), oxygen (O), and a halogen element.

Abstract: There is provided a phosphor powder which includes a wavelength converting material and a silica-based inorganic substance surrounding the wavelength converting material and represented by the following Formula 1, wherein a content of a hydrosilyl group (Si—H) is greater than or equal to 10 ppm by weight, based on the total weight of the silica-based inorganic substance: wherein X represents oxygen (O) or an amine group (NH), Y represents hydrogen (H), a hydroxyl group (OH), an amino group (NH2), or an alkyl group containing heteroelements, and the heteroelements include at least one selected from the group consisting of phosphorus (P), nitrogen (N), sulfur (S), oxygen (O), and a halogen element.

Abstract: The present invention relates to a method for preparing a hydrosilane using heteroatom-containing activated carbon, more particularly to a method for economically preparing a high-purity hydrosilane by redistribution of a chlorosilane using a heteroatom-containing activated carbon catalyst.

Abstract: The present invention relates to a method for preparing a hydrosilane using heteroatom-containing activated carbon, more particularly to a method for economically preparing a high-purity hydrosilane by redistribution of a chlorosilane using a heteroatom-containing activated carbon catalyst.

Abstract: The present invention relates to a solar cell having a wavelength converting layer formed of a polysilazane and a manufacturing method thereof to allow for low temperature sintering, to protect a wavelength converter from oxidation, degradation, and whitening, and thereby improve efficiency of the solar cell. The present invention provides for the solar cell including the wavelength converting layer which is formed by applying a coating solution containing a solvent, a polysilazane, and a wavelength converter onto a cell and an outer surface or inside of the cell, and then curing, and a manufacturing method of.

Abstract: Disclosed are a functional reinforcing filler including inorganic particles surface-modified with an alkenylsilanol obtained by hydrolyzing an alkenylalkoxysilane compound, and a method for preparing the same. Since the disclosed functional reinforcing filler has a functional group having a double bond, it has good reactivity for styrene-butadiene rubber and sulfur. Thus, when used as a functional reinforcing filler in the manufacture of rubber, it allows improvement of physical properties through adjustment of the addition amount of sulfur without additional use of the coupling agent. In addition, because of superior hydrolysis reactivity, the problem of alcohol can be solved and a rubber mixture with long scorch time can be prepared. In particular, when the functional reinforcing filler of the present invention is used in the manufacture of tires, improvement in modulus, tensile strength, rotational resistance and wet traction performance can be expected.

Abstract: There are provided a coating composition having excellent visible light transmittance and photoluminescence properties, and a wavelength converting thin film prepared by using the same. The coating composition according to the present invention includes a solvent, polysilazane, and a wavelength converting agent, and has visible light transmittance of 50% or more with respect to an aqueous solution. According to the present invention, a wavelength converting thin film having excellent visible light transmittance and photoluminescence properties can be prepared.

Abstract: Disclosed herein are a surface modifier for metal oxide particles and a method of modifying the surface of metal oxide particles using the same. The surface modifier consists either of an alkylsilanepolyol containing a cyclic alkyl group capable of imparting steric hindrance or of a mixture of said alkylsilanepolyol with alkylalkoxysilane, and the method of modifying the surface of metal oxide particles comprises coating the surface modifier on the hydrophilic surface of the metal oxide particles through chemical bonding so as to impart hydrophobicity or amphiphilicity (hydrophilicity and hydrophobicity) and reactivity to the surface of the metal oxide particles.

Abstract: Provided are a saturated N-heterocyclic carbene-ligand metal complex derivative, a method for preparing the same, and a method for preparing a silane compound by hydrosilylation using the same as a catalyst. To describe in more detail, the metal complex derivative has a saturated N-heterocyclic carbene derivative and an olefin ligand at the same time. A silane compound is prepared by hydrosilylation in the presence of the metal complex derivative as a catalyst. The provided metal complex derivative of the present invention has superior stability during hydrosilylation reaction and is capable of effectively performing the hydrosilylation reaction at low temperature even with small quantity. Further, a product with superior regioselectivity may be obtained. In addition, after the hydrosilylation reaction is completed, the metal complex derivative may be recovered and recycled.

Abstract: Disclosed are a functional reinforcing filler including inorganic particles surface-modified with an alkenylsilanol obtained by hydrolyzing an alkenylalkoxysilane compound, and a method for preparing the same. Since the disclosed functional reinforcing filler has a functional group having a double bond, it has good reactivity for styrene-butadiene rubber and sulfur. Thus, when used as a functional reinforcing filler in the manufacture of rubber, it allows improvement of physical properties through adjustment of the addition amount of sulfur without additional use of the coupling agent. In addition, because of superior hydrolysis reactivity, the problem of alcohol can be solved and a rubber mixture with long scorch time can be prepared. In particular, when the functional reinforcing filler of the present invention is used in the manufacture of tires, improvement in modulus, tensile strength, rotational resistance and wet traction performance can be expected.

Abstract: Disclosed are a functional reinforcing filler including inorganic particles surface-modified with an alkenylsilanol obtained by hydrolyzing an alkenylalkoxysilane compound, and a method for preparing the same. Since the disclosed functional reinforcing filler has a functional group having a double bond, it has good reactivity for styrene-butadiene rubber and sulfur. Thus, when used as a functional reinforcing filler in the manufacture of rubber, it allows improvement of physical properties through adjustment of the addition amount of sulfur without additional use of the coupling agent. In addition, because of superior hydrolysis reactivity, the problem of alcohol can be solved and a rubber mixture with long scorch time can be prepared. In particular, when the functional reinforcing filler of the present invention is used in the manufacture of tires, improvement in modulus, tensile strength, rotational resistance and wet traction performance can be expected.

Abstract: Disclosed are a functional reinforcing filler including inorganic particles surface-modified with an alkenylsilanol obtained by hydrolyzing an alkenylalkoxysilane compound, and a method for preparing the same. Since the disclosed functional reinforcing filler has a functional group having a double bond, it has good reactivity for styrene-butadiene rubber and sulfur. Thus, when used as a functional reinforcing filler in the manufacture of rubber, it allows improvement of physical properties through adjustment of the addition amount of sulfur without additional use of the coupling agent. In addition, because of superior hydrolysis reactivity, the problem of alcohol can be solved and a rubber mixture with long scorch time can be prepared. In particular, when the functional reinforcing filler of the present invention is used in the manufacture of tires, improvement in modulus, tensile strength, rotational resistance and wet traction performance can be expected.

Abstract: Provided is a method of preparing allylchlorosilane, and more particularly, a method of preparing allylchlorosilane with high yield by Si—C coupling reaction of an allyl chloride derivativce with a hydrosilane derivative under specific reaction conditions without using a catalyst.

Abstract: Provided are a functional reinforcing filler and a method of preparing the same, and more particularly, a functional reinforcing filler including inorganic particles having a surface modified by an organic silanepolyol obtained by hydrolyzing an organic alkoxysilane compound and a method of preparing the sane. The functional reinforcing filler has hydrophobicity and reactivity. If the functional reinforcing filler is used to prepare rubber, a coupling agent is not required, and the rubber does not emit volatile organic compounds (VOCs). In particular, a tire prepared using the functional reinforcing filler may have low rolling resistance and excellent wet traction.

Abstract: Provided are a saturated N-heterocyclic carbene-ligand metal complex derivative, a method for preparing the same, and a method for preparing a silane compound by hydrosilylation using the same as a catalyst. To describe in more detail, the metal complex derivative has a saturated N-heterocyclic carbene derivative and an olefin ligand at the same time. A silane compound is prepared by hydrosilylation in the presence of the metal complex derivative as a catalyst. The provided metal complex derivative of the present invention has superior stability during hydrosilylation reaction and is capable of effectively performing the hydrosilylation reaction at low temperature even with small quantity. Further, a product with superior regioselectivity may be obtained. In addition, after the hydrosilylation reaction is completed, the metal complex derivative may be recovered and recycled.

Abstract: Provided is a method of preparing allylchlorosilane, and more particularly, a method of preparing allylchlorosilane with high yield by Si—C coupling reaction of an allyl chloride derivativce with a hydrosilane derivative under specific reaction conditions without using a catalyst.