Hyundai Motor Company

Korea Institute of Science and Technology

Kia Motors Corporation

Korea University of Technology and Education Industry-university Cooperation Foundation

Do Suck Han

Chae Hwan Hong

Jin Woo Kwak

Kyong Hwa Song

Si Hwan Kim

Soo Hyun Kim

Han Saem Lee

Chi Hoon Choi

Young Mee Jung

Jiyoun Seo

Chi-Hoon Choi

Young-Ho Choi

Hyuk Kang

Byung Jin Choi

Gun Goo Lee

Jeong Hun Seo

Byung Sam Choi

Hyun Min Kang

Woo Min Kyoung

Ji Yeon Seo

Byeong Uk Nam

A device for indirectly cooling a battery module of an eco-friendly vehicle is provided that cools the battery module using an interfacial plate into which a heat pipe is inserted to maximize battery heat emission performance and simultaneously prevent degradation of battery performance. A thermally-conductive interfacial plate in which a heat pipe is embedded by over-molding is disposed between battery cells and a heat sink, which is a condensation unit, integrally connected to an upper end of the heat pipe is disposed in a cooling air flow path to improve contact strength between the interfacial plate and the battery cells. A planar heat emitter is disposed between the battery cells where the interfacial plate is not disposed to heat the battery to a proper-level temperature in a cold-start environment and a low-temperature environment, thereby improving battery performance and preventing degradation in vehicle power.

Device for indirectly cooling battery module of eco-friendly vehicle

Disclosed is a method for manufacturing a polylactic acid film. More specifically, the present invention relates to a method for stably and effectively obtaining optimized stereocomplex crystals through specified boiling point and evaporation time of a solvent allowing the content of stereocomplex crystals to be 100%.

Manufacturing method of poly lactic acid stereocomplex using solvent casting method

Disclosed is a micro particle for a thermal control material capable of being applied as a highly thermal conductive material for thermal control, and an apparatus and a method of producing the micro particle for the thermal control material by using an ultrasonic high-temperature vibration scheme. More specifically, a Boron Nitride (BN) particle having a plate shape and an excellent thermal conductivity is coated on a PCM having a shape of a micro bead, to increase the thermal conduction to the inside PCM, so that a phase change is easily generated, and which allows an easy treatment of the PCM in a liquid state at a temperature equal to or higher than a melting point of the PCM.

Micro particle for thermal control material and device and method of producing the same using ultrasonic high-temperature vibration scheme

Disclosed is a method for preparing hollow carbon fibers having an empty space in the cross section thereof. More specifically, the disclosed method includes preparing a spinning solution of an acrylonitrile-based polymer having a viscosity ranging from 2000 to 5000 poise at room temperature; spinning the prepared spinning solution using a spinneret designed for spinning hollow fibers; super-drawing and drawing spun fibers to prepare hollow precursor fibers; and stabilizing and carbonizing the hollow precursor fibers to prepare the hollow carbon fibers. The hollow carbon fibers obtained by the disclosed method have a lower specific gravity by 10 to 50% than conventional hollow carbon fibers (solid), but have similar mechanical properties to the conventional fibers. Furthermore, in the method, the diameter of carbon fibers can be adjusted. Thus, it is possible to widen the application of hollow carbon fibers.

Preparation method for hollow carbon fiber

Disclosed is a method for preparing lactide by using a solvent. According to the method, since an ionic liquid is used as a solvent in a second step in the course of preparing lactide, it is possible to secure mobility of the resulting reactant, and decrease a reaction temperature. In addition, the ionic liquid absorbs moisture generated during the reaction, and thus prevents degradation of lactide which is susceptible to moisture. Furthermore, to the present method allows for the preparation of lactide successively through the continuous supply of lactic acid oligomers. Because the use of an ionic liquid minimizes the contamination of a reactive group with by-products, the use of a solvent for reactor washing is unnecessary. Further, owing to a high boiling point of the ionic liquid, the ionic liquid can be easily harvested and recycled.

Method for preparing lactide using an ionic solvent

Disclosed are a polylactide stereocomplex with improved thermal stability and thus improved processability and a method for preparing the same. In order to confer flexibility to polymer chains,-type polylactide polymer containing a small amount of caprolactone (poly-lactide-caprolactone copolymer) is synthesized and it is uniformly mixed with-type single-phase polylactide to prepare a flexible polylactide stereocomplex. Since the polylactide stereocomplex having flexible polymer chains has superior heat resistance and mechanical stability and experiences little decrease of the degree of stereocomplex formation even after thermal processing, the polylactide stereocomplex having improved thermal stability can be advantageously used for engineering plastics requiring high strength and good thermal stability, alternative materials for general-use plastics, high-performance medical materials, or the like because of its remarkably improved processability.

Preparation method of flexible polylactide stereocomplex and the compound thereof

The present invention provides a method of preparing lactide with a high yield from lactate obtained through a fermentation process. In certain embodiments, the invention provides a method of preparing high-purity lactide with a high yield, wherein the method comprises treating lactate with a specific solvent, using a catalyst, and phase-separating the resultant. In accordance with the invention, costs for manufacturing polylactic acid can be considerably reduced.

Method of preparing lactide from lactate

Disclosed is an apparatus and a method for producing lactic acid, wherein only lactic acid is selectively absorbed and separated from fermentation liquor using a lactic acid absorption resin and wherein a neutralizing agent is not used. The present invention does not include a neutralizing process and a process of converting lactate to lactic acid. The method comprises: adding and mixing a culture medium, microorganism and sugar in a fermenter; passing a fermentation liquor through a microorganism filtration unit to remove microorganisms; and selectively absorbing and separating lactic acid from filtered liquid using a lactic acid absorption resin. The apparatus includes a fermenter for lactic acid fermentation; a filtration unit for removing a microorganisms from the fermentation liquor; and a lactic acid absorption resin for selectively absorbing lactic acid from the filtered liquid.

Method and apparatus for producing lactic acid

Disclosed is a method for preparing hollow carbon fibers having an empty space in the cross section thereof. More specifically, the disclosed method includes melt-spinning an acrylonitrile-based polymer by using a supercritical fluid as a plasticizer; drawing spun fibers to prepare hollow precursor fibers; and stabilizing and carbonizing the hollow precursor fibers to prepare the hollow carbon fibers. The hollow carbon fibers obtained by the disclosed method have at least a 10 to 50% lower specific gravity than conventional hollow carbon fibers (solid), but have similar mechanical properties to the conventional fibers. Furthermore, the diameter of carbon fibers can be adjusted, thereby making it possible to widen the application of hollow carbon fibers.

Preparation method for hollow carbon fiber using supercritical fluid

Disclosed is a corrugated plastic composite spring for a vehicle suspension and an apparatus and method for manufacturing the same. The apparatus includes a corrugated extrusion part, a braiding part, and a pultrusion part. The corrugated extrusion part forms a preform having a hollow corrugated structure. The braiding part weaves a three-dimensional woven fabric on the preform. The pultrusion part impregnates the three-dimensional woven fabric with thermosetting resin.

Plastic composite spring for vehicle suspension and apparatus and method for manufacturing the same

Disclosed is a method for manufacturing a polylactic acid composite composition, and a polylactic acid composite composition formed thereby. More particularly, there is disclosed a method for manufacturing a polylactic acid composite composition including: melting and blending a composition containing 60-80 wt % of a poly(-lactic acid) resin, 15-30 wt % of a poly(-lactic acid) resin and 5-10 wt % of a poly(ethylene-alkyl acrylate-glycidyl methacrylate) resin at 190-195&#xb0; C.; and injecting the resulting melt in a mold whose surface temperature is 100-110&#xb0; C. The present invention provides a material having superior heat resistance, impact strength and tensile strength by blending the PLLA resin, the PDLA resin and the poly(ethylene-alkyl acrylate-glycidyl methacrylate) resin at specific proportion, under controlled processing and molding conditions. The polylactic acid composite composition prepared according to the present invention can replace the petroleum-based general-use polymer resins and engineering plastic materials that have been used for automobile parts with the environment-friendly biomass-based biomaterials, and may be usefully utilized for automobile interior and exterior parts.

Manufacturing method of polylactic acid composite composition

The present invention relates to a polypropylene-polylactic acid composite composition comprising a mixture of polypropylene resin and polylactic acid resin, wherein ethylene-octene copolymer grafted by anhyrdrous maleic acid, polylactic acid resin grafted by anhydrous maleic acid, polyethylene-glycidyl methacrylate resin and talc particles are added thereto. The composition reduces COemission and improve mechanical strength and heat resistance, thereby being suitable as a material for the interior and exterior parts of a vehicle as well as construction.

Eco-friendly polypropylene-polylactic acid composite composition

The present invention features polylactic acid composite compositions, more particularly a composite composition. The provided polylactic acid composite composition preferably includes the biomaterial polylactic acid resin and, accordingly, it is capable of effectively reducing carbon dioxide emission. Hence, it goes along with the low-carbon, green growth initiative. Further, with improved mechanical strength and heat resistance, it is usefully applicable to automotive interiors/exteriors, construction interiors, etc.

Growing community of inventors

Gyeonggi-do, South Korea

Do Suck Han