Abstract:
본 발명은 고강성 및 내열성이 우수한 폴리프로필렌-폴리유산 복합재료 조성물에 관한 것으로서, 더욱 상세하게는 폴리프로필렌 수지와 L- 혹은 D-폴리유산 수지가 일정 함량비로 포함된 수지성분에, 첨가제로서 충격보강제, 유리섬유, 핵제 및 상용화제가 일정 함량비로 포함되어 있음으로써 폴리유산의 내열성, 내충격성, 인장강도 및 굴곡강도 등의 물성을 크게 보강하게 되므로 범용 고분자 소재의 대체가 가능한 폴리프로필렌-폴리유산 복합재료 조성물에 관한 것이다.
Abstract:
본 기술은 용매를 이용한 락타이드 제조방법으로서, 락타이드를 제조할 때 두번째 단계에서 이온성 액체를 용매로 사용하여 반응물의 모빌러티를 확보하여 반응 온도를 낮추고 반응 중 발생하는 수분을 이온성 액체에서 흡수하여 수분에 취약한 락타이드가 분해가 일어나지 않도록 할 수 있다. 뿐만 아니라 지속적인 올리고머 투입에 의한 연속적인 락타이드 제조가 가능하게 된다. 이온성 액체에 의해 반응 부산물에 의한 반응기 오염이 최소화되어 반응기 세척을 위한 용매가 불필요하게 된다. 더불어 이온성 액체의 높은 끓는점으로 인해 이온성 액체의 회수 및 재활용도 용이한 장점이 있다.
Abstract:
The present invention relates to a polylactic acid resin composition for a hot-melt adhesive film, more specifically, to a polylactic acid resin composition for a hot-melt adhesive film, wherein the composition reduces foul odor and improves adhesion by mixing a linear low density polyethylene resin, an acrylate comonomer resin with good adhesion to a fiber material, and a low carbon polylactic acid resin obtained from biomass at an optimal ratio and can be utilized in environment-friendly automotive parts by containing 20% or more biomass.
Abstract:
PURPOSE: A method for preparing D-type lactic acids is provided to obtain high purity D-type lactic acids of high yield by separating generated lactic acids through selective absorption/desorption using an activated carbon stick and to largely save time and costs. CONSTITUTION: A method for preparing D-type lactic acids from sugar through fermentation comprises the steps of: adding microorganisms to sugar in a fermentation reactor and preparing a fermented liquid; adding a sterilized stick to the fermentation reactor and adsorbing lactic acids; isolating the lactic acid-adsorbed activated carbon stick from the fermentation reactor and precipitating the lactic acid-adsorbed activated carbon stick in a collection reactor; and desorbing lactic acids in an acetic solvent contained in the collection reactor and collecting D-type lactic acids. [Reference numerals] (AA) Fermentation reactor; (BB) Move after taking out
Abstract:
PURPOSE: A manufacturing method for a polylactide stereoisomeric composite is provided to have excellent heat resistance and mechanical stability using a small amount of an organic solvent. CONSTITUTION: A manufacturing method for a polylactide stereoisomeric composite comprises: a step of putting a poly D-lactide-caprolactone copolymer and a poly L-lactide type polymer into a reactor; and a step of adding an organic solvent into the reactor, and putting a supercritical fluid in order to polymerize the two polymers to the polylactide stereoisomeric composite. The copolymerizing ratio of the poly D-lactide-caprolactone copolymer and the poly L-lactide type polymer is 99.5:0.5-70:30, and the poly D-caprolactone copolymer has a weight-average molecular weight of 70,000-300,000 Da.
Abstract:
PURPOSE: A manufacturing method of a polylactic acid film is provided to stably and effectively manufacture a film with stereocomplex crystals without homo polylactic acid. CONSTITUTION: A manufacturing method of a polylactic acid film comprises: a step of manufacturing poly-L-lactic acid and poly-D-lactic acid in a solvent; and a step of evaporating the solvent to cast a polylactic acid mixture solution. The solvent satisfies formula 1:y=0.0042x^2-0.2769x+10+/-5. In the formula 1, x is the boiling point of the solvent, and y is the time to evaporate the solvent. The comprised amount of the poly-L-lactic acid and poly-D-lactic acid are 5-10 parts by weight. [Reference numerals] (AA) L-type PLA resin; (BB) D-type PLA resin; (CC) Collecting solvent; (DD) Spraying L, D type LPA resin + solvent molten resin; (EE) Nitrogen
Abstract:
PURPOSE: A method for preparing type D lactic acid is provided to quickly and cheaply prepare the type D lactic acid. CONSTITUTION: A method for preparing type D lactic acid with high optical purity comprises a step of culturing E.coli(KCTC 2223) at constant temperature and pH. The pH concentration is controlled by supplying an ammonium solution(NH_4OH). The optical purity of the type D lactic acid is 99% or more. The E.coli is cultured by batch culture or continuous culture under an anaerobic condition. [Reference numerals] (AA) Stain; (BB) Glucose; (CC) Fermenter; (DD) Fungus body separation; (EE) Culture medium; (FF) D lactic acid