Abstract:
PURPOSE: An A1-CNT composite and a manufacturing method thereof are provided to secure elasticity equivalent to cast iron by enhancing elastic modulus to 120GPa. CONSTITUTION: An A1-CNT composite has CNT which is vertically stood up by a magnetic field effect and is embedded in an aluminum alloy. The surface of CNT is coated with metallic oxide. The surface of metallic oxide is coated with Fe-Co-Ni based metallic oxide and has enhanced elastic modulus. CNT is coated with metallic oxide and then is coated in FeSO4, CoSO4, NiSO4, H3Bo3 solutions in an electroless plating method. [Reference numerals] (AA) Metal oxide; (BB) Fe-Co-Ni based metal compound
Abstract:
PURPOSE: A pleated plastic composites spring for suspension of a vehicle, a manufacturing device thereof, and a manufacturing method thereof are provided to simplify structure by omitting components such as a dust cover of a metal coil shape spring, an upper spring pad, and a lower spring pad and to reduce an assembling process. CONSTITUTION: A manufacturing device of a pleated plastic composites spring for suspension of a vehicle comprises a wrinkle extrusion molding unit(10), a blading unit(20), and a pultrusion unit(30). The wrinkle extrusion molding unit molds a preform(15) in a hollow wrinkle structure. The blading unit weaves three dimensional fabrics on the preform. The pultrusion unit impregnates thermosetting resin into the three dimensional fabrics and hardens. [Reference numerals] (31) Low-temperature immersion bath; (32) Continuous process oven
Abstract:
PURPOSE: A manufacturing method of D type polylactic acid is provided not to need a post treatment process collecting and separating solvent after reactions, and to manufacture the D type polylactic acid from D type lactide, which is obtained through microbe fermentation of biomass. CONSTITUTION: A manufacturing method of D type polylactic acid comprises: a step of manufacturing D type polylactic acid from D type lactide through solvent-free polymerization method by using stannuous octoate and 1-hexanol. The molar ratio of the D type lactide and the stannuous octoate is 1 : 1.05 × 10^(-4) - 1.20 × 10^(-4). The molar ratio of the stannuous octoate and the 1-hexanol is 1: 7.5-9.0.
Abstract:
PURPOSE: A manufacturing method of a nylon is provided to obtain a nylon 4 in which the yield of a nylon4 and physical properties are excellent and to reduce the emission of a carbon dioxide. CONSTITUTION: A manufacturing method of a nylon 4 comprises the following steps: a step of manufacturing a 4-aminobutyric acid from a glutamic acid or a glutamic acid sodium by using a glutamic acid dicarboxylase; a step of manufacturing 2-pyrrolidone from the 4-aminobutyric acid by using a catalyst or a desiccant; a step of reacting pyrrolidone and the potassium hydroxide to a molar ratio of 0.01-0.1; and a step of adding the reactant to the mixture of a carbon dioxide and a crown ether in which the molar ratio of the carbon dioxide is 0.05-0.5 relative to the 2-pyrroidone, and the molar ratio of the crown ether is 0.5-20 relative to the 2-pyrroidone.
Abstract:
본 발명은 폴리유산-나노클레이 복합재 조성물 및 이를 포함하는 친환경 자동차 내장재에 관한 것으로서, 더욱 상세하게는 2가지 타입의 광학이성질체를 특정 중량비로 함유한 폴리유산 수지를 사용하여 내열성을 확보하고, 유기화 층상 나노클레이와 폴리(에틸렌-글리시딜 메타크릴레이트) 수지를 도입하여 내충격성을 향상시킨 복합재 조성물에 관한 것이다. 본 발명은 기존 석유자원에서 합성되는 범용수지 및 엔지니어링 플라스틱 소재 (폴리프로필렌 및 폴리에스터, 아크릴로나이트릴부타디엔스타이렌)와 동등 또는 그 이상의 기계적 물성을 갖기 때문에, 자동차 내장재 등을 포함한 다양한 산업용 부품에 적용할 수 있다. 폴리유산, 나노클레이, 폴리(에틸렌-글리시딜 메타크릴레이트)
Abstract:
PURPOSE: A polylactic acid-nano clay composite composition is provided to ensure excellent heat resistance, shock resistance, and biodegradation property, and to enable use as automobile interior materials. CONSTITUTION: A polylactic acid-nano clay composite composition comprises (A) 100 parts by weight of polylactic acid resins containing 65~85 weight% of optical isomer L type polylactic acid and 15~35 weight% of optical isomer D type polylactic acid, (B) 0.5~5 parts by weight of organic layered nanoclay, (C) 5~10 parts by weight of poly(ethylene-glycidyl methacrylate) resin, and (D) 2~5 parts by weight of triaryl isocyanate.
Abstract:
PURPOSE: An aluminum alloy for cylinder head of diesel engine is provided to improve heat resistance and fatigue life time of the cylinder head by increasing hardness of parts such as cylinder head of high pressure high power diesel engine at which severe thermal load is applied. CONSTITUTION: The aluminum alloy for cylinder head of diesel engine comprises 7 to 10 wt.% of silicon, 0.5 to 2.0 wt.% of copper, 0.4 to 1.0 wt.% of magnesium, 0.15 wt.% or less of Fe, 0.5 to 1.0 wt.% of titanium, 0.05 to 0.1 wt.% of manganese, 50 to 300 ppm of strontium, 0.15 wt.% or less of other inevitable impurities and a balance of aluminum.
Abstract:
PURPOSE: An apparatus for evaluating formability of semi-solid materials is provided to reduce energy consumption, simplify estimation procedures and shorten estimation time, while allowing the evaluation to be performed by using a small amount of specimen. CONSTITUTION: An apparatus comprises a heating furnace(22); a specimen holder(24) arranged within the heating furnace, and which accommodates a specimen(1) and transfers heat from the heating furnace to the specimen; a temperature sensor(26) for measuring temperature of the specimen; a lower compression plate(32) arranged within the specimen holder, and on which the specimen is disposed; an upper compression plate(34) disposed in parallel to the lower compression plate, and which compresses downward the upper surface of the specimen; a press rod(38) having a lower end formed integrally with the upper compression plate, and which is connected to a press member(36) for moving the upper compression plate downward; a strain measuring member(40) for measuring strain of height of the specimen; and a controller(50) connected to the temperature sensor and the heating furnace so as to control the heating furnace in accordance with the temperature of the specimen, and connected to the strain measuring member so as to calculate at least one of the true strain, true strain rate and the true stress from the strain of height of the specimen.
Abstract:
Si 9.5-10.5중량%, Cu 0.2중량% 이하, Mg 0.75-1.2중량%, Mn 0.03중량% 이하, Fe 0.3중량% 이하, Zn 0.03중량% 이하, Ti 0.2중량% 이하, SiC 15.0-25.0중량%, Al 4.75-2.54중량%로 이루어진 알루미늄합금 조성물은 강성 및 내마모성이 탁월하여 자동차 제동장치인 브레이크 드럼 및 브레이크 디스크의 재료로서 우수한 소재이다.