Abstract:
PURPOSE: A method for quantitative-analyzing the rubber content and the grafting ratio of an acrylonitrile-butadiene-styrene(ABS) resin is provided to improve the reliability of measurement with respect to the content of butadiene in the ABS resin. CONSTITUTION: A method for quantitative-analyzing the butadiene content of the ABS resin includes the following: The butadiene double bonds of an ABS resin is substituted into single bonds using iodine chloride in chemical formula 1. Remaining iodine chloride is reacted with potassium iodine to generate iodine molecules in chemical formula 2. The iodine molecules are titrated using sodium thiosulfate(Na_2S_2SO_3) in chemical formula 3. Styrene acrylonitrile(SAN) copolymer is dissolved from the ABS resin using an organic solvent. Insoluble SAN-grafted-butadiene is collected. The SAN grafting ratio of the SAN-grafted-butadiene is analyzed.
Abstract:
The present invention relates to a method for measuring a mixing rate of polyethyleneterephthalate (PET) and polytrimethyleneterephthalate (PTT) fibers. The method comprises a qualitative analysis step of checking the existence of PET and PTT fibers in a fiber blend and a quantitative analysis step of measuring a mixing rate using a microscopic count method through the color difference between the PET and PTT fibers caused by double refraction in a cross polarization state of a polarized light microscope (PLM). Thus, the present invention can conveniently and precisely calculate the mixing rate of the PET and PTT fibers in the fiber blend in which various fibers are mixed.
Abstract:
본 발명은 PVC+ABS 블렌드 소재를 TGA를 통하여 각각의 이성분의 함유량을 간단하게 산출할 수 있도록 함으로써, 이성분의 유기물로 이루어진 블렌드 소재의 정량 분석에 효과적이며, 그 분석과정이 간단하면서도 큰 신뢰도를 얻을 수 있도록 한 열분해 거동을 이용한 PVC+ABS 블렌드의 함유량 분석 방법에 관한 것이다. 이를 위해, 본 발명은 ⅰ) PVC+ABS 블렌드 시편 소재가 탑재된 TGA 장비의 로(盧)를 30℃~400℃까지 질소 분위기 하에서 20℃/min의 속도로 승온시킨 후, 다시 400℃에서 20분(min)간 등온 유지시키는 단계와; ⅱ) 5℃~20℃/min의 속도로 580℃~620℃까지 승온시킨 후, 로(盧)의 분위기를 산소로 바꿔주는 단계와; ⅲ) 산소 분위기 하의 로(盧)를 5℃~20℃/min의 속도로 850℃~870℃까지 승온시키는 단계와; ⅳ) 상기 ⅱ)단계에서, 시편소재의 PVC가 HCl로 분해되는 온도에서, 시편의 무게비를 구하여, 실제 HCl량, PVC량, PVC 및 ABS 함유비를 산출하는 PVC+ABS 블렌드의 함유량 분석 단계; 로 이루어지는 것을 특징으로 하는 열분해 거동을 이용한 PVC+ABS 블렌드의 함유량 분석 방법을 제공한다. PVC+ABS 블렌드, 함유량 분석, 승온, 등온, 분해온도, HCl량, 정량분석
Abstract:
An analytical method of the wood content of wood stock for car is provided to accurately analyze the each content of base polymer and wood of the wood stock consisting of the polypropylene and organic cellulose, thereby preventing property degradation of material. The analytical method of the wood content of car wood stock comprises the steps of: setting up the wood stock material specimen which is the composite material in which the polypropylene and Wood are contained to have the size to be installed in the thermogravimetric analyzer(TGA) equipment; and subjecting the wood stock to the temperature increase and decrease according to the pyrolysis execute procedures of the thermogravimetric analyzer equipment, and simultaneously controlling the air condition of the furnace to calculate the content of the wood stock, wherein the pyrolysis execute procedures include the steps of: increasing the temperature of the furnace from 30 deg. C to 400 deg. C under nitrogen condition at the speed of 20 deg. C/min; maintaining the temperature at 400 deg. C for 20 minutes; increasing the temperature to 580 deg. C at the speed of 20 deg. C/min; and changing the condition of furnace with oxygen, and increasing the temperature to 850 deg. C at the speed of 20 deg. C/min.
Abstract translation:提供汽车木材木材含量的分析方法,以准确分析由聚丙烯和有机纤维素组成的木材原料的基础聚合物和木材的每种含量,从而防止材料的性能下降。 汽车木材原料的木材含量分析方法包括:将热塑性分析仪(TGA)中安装有聚丙烯和木材的复合材料的木材原料样品安装成要安装的尺寸, 设备; 并根据热重分析仪设备的热解执行程序对木材料进行升温和降温,同时控制炉的空气状态以计算木材原料的含量,其中,热解执行方法包括以下步骤: :将炉子的温度从30度增加 C至400度 在氮气条件下以20度的速度。 C /分钟; 保持温度在400度。 C 20分钟; 将温度升高至580度。 C以20度的速度 C /分钟; 并用氧气改变炉子的状态,并将温度升高到850度。 C以20度的速度 ℃/分钟。
Abstract:
A gear box of a hydraulic power steering system is provided to prevent hydraulic pressure from being increased by installing a return port reducing pressure generated by external impact to a valve housing of a hydraulic control valve and by installing a reservoir diminishing oil flow in the return port, thereby minimize a hydraulic hammering noise. A gear box of a hydraulic power steering system including a valve housing(110) of a hydraulic control valve(100) installed in one side of the gear box, which includes a supply hole(112) and a discharge hole(111), an input shaft(120) installed inside the valve housing to receive external rotation force, a pinion(130) connected with the input shaft spaced by a predetermined interval in a rotation direction, which receives rotation force, a torsion bar(140), which can be twisted, installed inside the pinion and the input shaft, a valve body(150) installed to generate relative displacement with the input shaft according to torsion of the torsion bar, comprises: a return port(113) formed in a lower portion of the valve housing of the hydraulic control valve, which reduces pressure generated by external impact and a reservoir(300) installed in the return port, which diminishes oil flow.
Abstract:
A method for measuring scrap content of polypropylene composite is provided to conveniently, rapidly and accurately analyze the scrap content by using a secondary functional formula showing the relation between the elastic viscosity ratio of a formed article and the scrap content, thereby predicting quality lowering of the formed article due to over-excessive use of the scrap. The method for measuring scrap contents of polypropylene composite containing 20 wt.% of talc comprises the steps of: (a) preparing a virgin formed article sample of the composite; (b) preparing a virgin formed article sample of the composite; (c) preparing a scrap-containing formed article sample of the composite; (d) performing a dynamic frequency sweep test of advanced rheometric expansion system(ARES) on each of the sample so as to measure the ratio of the elastic viscosity of the scrap-containing formed article sample to the elastic viscosity of the virgin formed article sample; and (e) substituting the elastic viscosity ratio for X in a secondary functional formula to calculate the amount of scrap content Y, where the secondary functional formula is represented as Y = a + bX + cX^2(wherein a is constant, b is a coefficient of X and c is a coefficient of X^2).