Abstract: The present invention relates to a submerged hollow fiber membrane module that includes a partition membrane having a slanted slit-shaped opening, and thus capable of not only improving operating efficiency of a hollow fiber membrane module by accelerating the water flow, but also allowing easy discharge of highly concentrated raw water around the hollow fiber membrane to the outside of the module during a reverse wash process.

Abstract: Disclosed is a polylactic acid composition with improved heat-resistance and improved impact-resistance. Specifically, in the disclosed polylactic acid composition, both impact strength and heat-resistance are improved by mixing 30 to 80 wt % of polyketone and 10 to 40 wt % of modified rubber. The disclosed polylactic acid composition does not only exhibit excellent in heat resistance, chemical resistance, fuel permeation resistance, abrasion resistance, etc., but also has improved impact-resistance and improved heat resistance. Thus, it is possible to employ polylactic acid as a bioplastic in interior/exterior parts of a vehicle.

Abstract: Provided is a fabric for an airbag using a polyethylene terephthalate fiber, and particularly, to a fabric for an airbag having enhanced thermal resistance and instantaneous thermal strain rate, which is manufactured using a polyethylene terephthalate fiber for an airbag manufactured by controlling the strength and elongation of the polyethylene terephthalate fiber to replace a conventional fabric for an airbag using a yarn formed of nylon 66. The fabric for an airbag including a polyethylene terephthalate fiber manufactured by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3 dl/g has thermal resistances of 0.45 to 0.65 seconds at 450° C., and 0.75 to 1.0 seconds at 350° C.

Abstract: Disclosed is a polylactic acid composition with improved heat-resistance and improved impact-resistance. Specifically, in the disclosed polylactic acid composition, both impact strength and heat-resistance are improved by mixing 30 to 80 wt % of polyketone and 10 to 40 wt % of modified rubber. The disclosed polylactic acid composition does not only exhibit excellent in heat resistance, chemical resistance, fuel permeation resistance, abrasion resistance, etc., but also has improved impact-resistance and improved heat resistance. Thus, it is possible to employ polylactic acid as a bioplastic in interior/exterior parts of a vehicle.

Abstract: The present invention provides a polyketone composition having about 40˜90 wt % of polyketone, about 5˜40 wt % of polyamide, and about 5˜20 wt % of modified rubber. The composition of the present invention greatly improves the impact resistance of polyketone, which has increased heat resistance, chemical resistance, fuel permeation resistance, abrasion resistance or the like, and thus may be widely applied in various industrial fields, such as automotive parts including wheel covers, wheel caps, fuel filler necks, fuel tanks, fuel tubes, center fascias, door handles, roof rack covers, gear, junction boxes, connectors, seat backs or the like, electric/electronic parts, and household items, thereby providing durability of the parts and price competition.

Abstract: The present invention relates to an apparatus for detecting partial discharge for electric power devices, comprising: an insulator having a predetermined shape; a receiving unit arranged inside or outside the insulator to receive signals of a plurality of sub-bands; and a connection electrode which transmits signals of a receiving electrode to a coaxial cable in conjunction with the connected coaxial cable.

Abstract: The present invention relates to a Ziegler-Natta catalyst, and more specifically to a Ziegler-Natta catalyst for olefin polymerization which may use a compound of Formula 3 as an internal electron donor to obtain polymers with high activity, wide molecular weight distribution and low content of fine particle.

Abstract: The present invention provides a polyketone composition having about 40˜90 wt % of polyketone, about 5˜40 wt % of polyamide, and about 5˜20 wt % of modified rubber. The composition of the present invention greatly improves the impact resistance of polyketone, which has increased heat resistance, chemical resistance, fuel permeation resistance, abrasion resistance or the like, and thus may be widely applied in various industrial fields, such as automotive parts including wheel covers, wheel caps, fuel filler necks, fuel tanks, fuel tubes, center fascias, door handles, roof rack covers, gear, junction boxes, connectors, seat backs or the like, electric/electronic parts, and household items, thereby providing durability of the parts and price competition.

Abstract: A polyethylene terephthalate multifilament prepared by spinning polyethylene terephthalate chips having an intrinsic viscosity of 0.8 to 1.3 is provided. In order to improve the energy absorption capability of a textile for polyethylene terephthalate air bags, a textile for air bag having an improved rupture property at a welt portion in an air bag cushion deployment test can be prepared using a polyethylene terephthalate fiber by adjusting a strength/deformation curve of the polyethylene terephthalate fiber. Here, the polyethylene terephthalate fiber has a strength/deformation curve in which the polyethylene terephthalate fiber extends by less than 4% when subjected to an initial stress of 1.0 g/d at room temperature, extends by less than 12% subjected to a medium stress of 4.5 g/d and extends by 3% or more until fibers are cut at a tensile strength of at least 7.

Abstract: The present invention relates to a method for separating and refining high purity 2,6-naphthalene dicarboxylic acid having an excellent color and purity of 99.9% or more by using crude 2,6-naphthalene dicarboxylic acid. And more particularly, the present invention relates to a method for separating and refining 2,6-naphthalene dicarboxylic acid, in which adjustment of pressure and temperature during multiple-step crystallization process enables controlling nucleation and the crystal growth rate, thereby allowing a particle size distribution and form to be controlled.

Abstract: Provided are a novel microorganism and a method for purifying 2,6-naphthalene dicarboxylic acid with high purity using the microorganism. The microorganism is Pseudomonas sp. Strain HN-72 isolated from soil and has the ability to convert 2-formyl-6-naphthoic acid contained as an impurity in a crude naphthalene dicarboxylic acid, which is an oxidation product of 2,6-dimethylnaphthalene, to 2,6-naphthalene dicarboxylic acid. The Pseudomonas sp. strain HN-72 has excellent effects in producing high-purity 2,6-naphthalene dicarboxylic acid in high yield.

Abstract: Disclosed are a method of manufacturing a composite bushing and a diagnostic system for the partial discharge of the composite bushing that may provide a thin-film ultra high frequency (UHF) sensor to a composite bushing, thereby measuring a partial discharge of a composite bushing and preventing a safety accident of the composite bushing that may occur due to the partial discharge.

Abstract: This invention relates to a dehydrogenation catalyst having a macropore size and a high active density of platinum, suitable for use in dehydrogenation of a hydrocarbon gas. This dehydrogenation catalyst having a macropore size and a high active density of platinum is highly active, has high active density per unit catalytic surface area, facilitates material transfer of reactants and products, delays deactivation due to coke formation, keeps the initial activity constant after being regenerated thanks to the disposal of coke, has high strength and so is resistant to external impact, and undergoes neither structural changes due to heat nor changes in the properties of active materials.

Abstract: The present invention relates to a process for producing tetrahydrofuran polymer or tetrahydrofuran copolymer by using heteropolyacid catalyst, and more particularly, to a process for producing tetrahydrofuran polymer by using hydronium ion water having a pH of 5.5 or less as a reaction initiator in the initiation step.

Abstract: A polyethylene terephthalate monofilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3, which gives a stress-strain curve exhibiting an elongation of less than 2.5% at an initial stress of 2.0 g/d, with an initial modulus value of 80 to 160 g/d, an elongation of 7.5% or less in a stress range of from 2.0 g/d to 9.0 g/d, and an elongation of at least 2.0% or more in a stress range of from 10.0 g/d to the point of break, is provided.

Abstract: The present invention relates to a method for preparing 1,5-dimethyltetralin using a dealuminated zeolite beta catalyst. The preparation method of 1,5-dimethyltetralin according to the present invention has the effects of not only showing high conversion and high selectivity of 1,5-dimethyltetralin but also of suppressing deactivation of a zeolite beta catalyst so as to enhance the catalyst life, by using the dealuminated zeolite beta catalyst.

Abstract: An elastomeric fiber can be easily unwound from a package by way of using an OETO unwinding device which comprises a fiber package, a standby package and a static guide such that the distance from the inlet orifice of the static guide to the center of the static guide-facing side of the fiber package is in the range of 25 to 38 cm, and the distance (R) between the centers of the static guide-facing sides of the fiber package and standby package is in the range of 25 to 50 cm.

Abstract: Disclosed herein are a method for preparing a transformant which carries a gene encoding benzaldehyde dehydrogenase derived from Sphingomonas aromaticivorans KCTC 2888 and expresses the enzyme, and biological purification of the crude naphthalene dicarboxylic acid, obtained upon the oxidation of 2,6-dimethylnaphthalene with the concomitant production of 2-formyl-6-naphthoic acid, by applying a transformant for the conversion of FNA into naphthalene dicarboxylic acid.

Abstract: Disclosed is a shape memory polyamide, produced by adding a polyvalent carboxylic acid and a polyvalent amine when polyamide is polymerized from e-caprolactam or hexamethylenediamine and adipic acid, and having an aromatic component which is introduced by one or more among the polyvalent carboxylic acid and the polyvalent amine and has a total amount ranging from 0.4 mol % to 10 mol % based on the amount of the raw material for polyamide. Also, a method of producing a shape memory polyamide fabric using the shape memory polyamide is provided. The polyamide fabric produced using the shape memory polyamide is a highly functional fabric which does not easily wrinkle and easily recovers its original shape even when wrinkled, and thus may be applied as material for various kinds of clothing.

Abstract: Disclosed herein are a process for the refinement of nitrogen trifluoride gas and an adsorbent used therein. A nitrogen trifluoride (NF3) gas including carbon tetrafluoride (CF4) as an impurity is permeated into a bed of the zeolite 3 A, 4A or 5 A which is ion exchanged with alkali earth metal and is thermally treated at 150 to 600° C. for 0.5 to 100 hours so as to selectively adsorb nitrogen trifluoride onto the bed, followed by the desorption of the nitrogen trifluoride therefrom.