• Title, Summary, Keyword: plasticizer

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Properties of hydroxyapatite sintered body added with plasticizer (Hydroxyapatite 소결체의 가소제 첨가에 따른 특성)

  • Ryu, Su Chark;Kim, Jae Kyu;Kim, Seung Hyeon
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.29 no.4
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    • pp.167-172
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    • 2019
  • The strength (MPa), hardness (Hv), shrinkage (%) and biological properties of the HAp were measured by using an organic plasticizer which facilitates the molding and heat treatment. Mechanical properties such as compressive strength, bending strength and hardness were increased with increasing amount of plasticizer, but mechanical properties were decreased when plasticizer was added more than 7 %. This is because addition of the plasticizer above the allowable value causes cracking during molding, and such cracks promote the generation of microcracks and pores at the time of sintering, resulting in a decrease in mechanical properties. As a result of the antimicrobial activity test, no bacteria were detected regardless of the addition amount of plasticizer.

A Study on the Quality Characteristics of Concrete Using Supper Plasticizer (고성능감수제를 사용한 콘크리트의 품질특성에 관한 연구)

  • 배수호;신의균;윤상대
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.132-137
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    • 1993
  • The purpose of this study is to evaluate the quality characteristics of concrete using super plasticizer which is on the market within the country. For this purpose, nine kinds of super plasticizer are compared and analyzed for the slump , air content, unit weight, water-reducing percent and ratios of compressive strength with admixture content. As a result, the optimum quantity of admixture content were obtaining for ordinary and high strength concrete using super plasticizer.

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Adsorption and Fluidity Properties of Recycled Cement Powder (재생미분말의 흡착특성과 유동특성)

  • Lee, Jong-Kyu;Chu, Yong-Sik;Jung, Suk-Jo
    • Journal of the Korean Ceramic Society
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    • v.43 no.12
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    • pp.846-851
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    • 2006
  • This paper discuss the adsorption and fluidity properties of recycled cement powder with different hydration hysteresis and particle size. Reactivity of hydrated fine powder was negligible low. Therefore, the adsorption and fluidity properties with super-plasticizer for hydrated recycled cement powder was very important for using additive material. Adsorption amount of super-plasticizer was increased by the finer hydrated recycled cement powder addition. And the fluidity of hydrated recycled cement powder was very poor than un-hydrated cement powder. To Improve the fluidity of hydrated recycled cement powder, PC super-plasticizer is the more effective than NS super-plasticizer.

Study on Property Modification with Kind and Additive Amount of Plasticizer in the Manufacture of Compounds for Cable Sheath (전선피복용 컴파운드의 제조에서 가소제의 종류와 첨가량에 따른 물성 변화 연구)

  • Li, Xiangxu;Lee, Sang Bong;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.2
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    • pp.11-16
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    • 2019
  • The four different polymer compounds were manufactured with the two kinds of plasticizers [(di-2-ethylhexyl sebacate(DOS), and di-2-butyl sebacate(DBS)] and two different additive amounts(18, 26 phr) of the same plasticizer for making cable sheath for ship. Ethylene-vinylacetate, ethylene-propylene-diene-copolymer as matrix polymers and ethylene-vinylacetate grafted maleic anhydride as coupling agent were selected for compounding with fire retardant, closslinking agent, filler, and other additives besides plasticizer. The compound including DOS showed the higher ${\Delta}T$ than that including DBS at the same additive amount in the rheology test. And with increasing plasticizer, the compounds resulted in lower tensile strength and higher elongation by lubricating effect of plasticizer. DOS yielded better aging resistance and cold resistance than DBS due to the good heat resistance and low solidifying point of DOS compared to DBS.

Nanocomposite of Ethyl Cellulose Using Environment-Friendly Plasticizer (친환경 가소제를 첨가한 에틸 셀룰로오스 나노복합체)

  • Choi Sung Heon;Cho Mi Suk;Kim Dukjoon;Kim Ji-Heung;Lee Dong Hyun;Shim Sang Joon;Nam Jae-Do;Lee Youngkwan
    • Polymer(Korea)
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    • v.29 no.4
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    • pp.399-402
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    • 2005
  • In this study, ethyl cellulose (EC)/montmorilloniote(MMT) nanocomposite films plasticized with environmental-friendly plasticizer (BET, EBN, ESO) were prepared by melt process using Hakke mixer. The $T_g$ of plasticized EC films decreased from 122 to $71^{circ}C$ with the increase in the BET content up to 30 $wt\%$. The addition of 10 $wt\%$ epoxidized soybean oil (ESO) as the second plasticizer cause the further drop of $T_g$ from 81 to $61^{circ}C$. The plasticizer-effect of BET was better than that of EBN. When the plasticizer was added into the EC films, the mechanical properties of EC films was decreased, however the addition of monotmorillonite (MMT) into the EC films or the ring opening reaction of ESO plasticizer cause enhancement of mechanical properties.

Extraction Property of Plasticizer in LPG High Pressure Rubber Hose (LPG용 고압고무호스에서 가소제 추출특성)

  • Kim, Young-Gu
    • Journal of the Korean Chemical Society
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    • v.48 no.2
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    • pp.156-160
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    • 2004
  • The extraction rates of plasticizer of LPG high pressure rubber are studied. Submerging solvents are composed of propane, n-butane, n-pentane, n-hexane, n-heptane, propylene, 1,3-butadiene, 1-pentene, 1-hexene, ethanethiol, t-butanethiol, dimethyl sulfide, methyl ethyl sulfide. The relationship between the extraction rate of plasticizer and the descriptors of submerging solvent by using multiple linear regression is as follows; PE(wt%) = 7.5193 - 0.58500Carbon${\sharp}$ + 2.3294DB + 2364SH, (N = 13, F = 24.135, R$^2$ = 0.8894, R$_{adj}^2$ = 0.8526, Variance = 7.588) Plasticizer is well extracted by LPG composed of the high vapour pressure and polarity compounds. The mass of extracted plasticizer becomes increasing in proportion to the contents of thiol sulfur compound and unsaturated hydrocarbon such as propylene and 1,3-butadiene in LPG. While the heavier hydrocarbons are, the less the quantities of plasticizer extracted from rubber are.

Mechanical and Barrier Properties of Soybean Curd Residue Protein Films (비지 단백질로 제조한 가식성필름의 기계적 및 물질투과특성)

  • Cho, Seung-Yong;Park, Jang-Woo;Rhee, Chul
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.5 no.2
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    • pp.9-16
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    • 1999
  • Edible films were prepared from proteins extracted from soybean curd residue by alkaline extraction and isoelectric precipitation. Effects of film forming solution pH and plasticizers on mechanical and barrier properties of edible films were studied. films were formed within pH $7{\sim}11$ with tensile strength (TS) of $2.9{\sim}3.3$ MPa. Films produced under pH 10 had the highest TS and Elongation (E) (3.3 MPa and 60.1%) but no significant difference was observed among water vapor permeabilities (WVP) of film. Glycerol, sorbitol and its mixture (1:1, w/w) were added as plasticizers. The concentration and mixing ratio of plasticizers also affected the TS, E and WVP of films. TS of films decreased from 15.0 MPa to 2.9 MPa as plasticizer concentration increased from 0.4 to 0.8 g plasticizer/g protein. At a plasticizer concentration, the highest TS was observed when sorbitol was used whereas the highest E was measured when mixture of glycerol and sorbitol was used as plasticizer WVP of films increased as the plasticizer concentration increased. Films plasticized with glycerol showed the highest WVP among the films with the same plasticizer concentrations. Edible films prepared from soybean curd residue protein showed very low oxygen permeabilities ($29.5{\sim}61.1aL{\cdot}m/m^2{\cdot}s{\cdot}Pa$) and oil resistance at all plasticizer concentration level tested.

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Development of an Eco-friendly Plasticizer using Crude Glycol Derived from the Biodiesel Process (바이오디젤부산물인 폐글리세롤을 이용한 친환경 가소제의 개발)

  • Kang, Soo-Jung;Bae, Sung-Jae;Jin, Dae-Eon;Kim, Jinhwan
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.24 no.3
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    • pp.365-370
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    • 2014
  • Objectives: The major objective is development of an eco-friendly non-phthalate plasticizer using crude glycol derived from the biodiesel process. Methods: Glycerol monolaurate(GML) was synthesized from glycol and triglyrcerides. Glycerol diacetomonolaurate(GDAL) was synthesized from GML and acetic acid. Results: The synthesis of the GDAL plasticizer was measured with nuclear magnetic resonance spectroscopy(NMR). Mechanical properties were measured by universal testing machine(UTM) and the experimental values were compared with phthalate plasticizers such as dioctyl phthalate(DOP). In particular, the values for tensile strength and elongations with GDAL were higher than with DOP. Conclusions: We confirmed the development of an eco-friendly non-phthalate plasticizer by NMR. Based on our results, applicability for food and drug packaging materials was found.

Characteristics of Non-plasticizer PVAc Resin for Wood Products

  • Kim, Sumin;Kim, Hyun-Joong;Choi, Youn Mee;Jang, Sung-Wook
    • Journal of the Korean Wood Science and Technology
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    • v.35 no.2
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    • pp.61-68
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    • 2007
  • The applicable scope of adhesives in the current society is broad and currently, several types of PVAc resin are sold in the market for adhesives. PVAc resin is primarily used for wood works and paper adhesion. However, the PVAc resin itself has the disadvantages that its viscosity is highly temperature- dependent and the work condition and viscosity get worse at the low temperature in the winter seasons. Although phthalate-based plasticizer is used to complement these disadvantages, adhesion strength and heat-resistance are weakened by adding the phthalate-based plasticizer and in the winter period, the amount of quantity should be increased. Also in a high-density product, it worsens the work condition by causing a rise of viscosity and delays curing and in a low-density product, it worsens the storage stability by causing separate precipitation. In addition to these, the phthalate-based plasticizer as a material of causing environmental hormones is currently restricted in the advanced countries for its amount of use and also in the domestic market, it is necessary to prepare for the situation. This study has not only eliminated the disadvantages of PVAc resin emulsion without adding a phthalate-based plasticizer of causing these problems, but also synthesized the PVAc resin for timber adhesion that is excellent in woodwork, thermal-resistance, water-resistance, storage stability, and adhesion performance. As the result, it has proven an excellent performance in thermal resistance, water resistance, storage stability, and minimum film forming temperature.

The oral dose toxicity test and skin irritation test of eco-friendly plasticizer using crude glycerol derived (폐글리세롤을 이용한 친환경 가소제의 경구투여독성 및 피부자극성 시험)

  • Kang, Soo-Jung;Kim, Heeyoung;Park, Sangwon;Sim, Eunyoung;Kim, Jinhwan
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.25 no.3
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    • pp.322-327
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    • 2015
  • Objectives: The major objective of this study is the oral dose toxicity test and skin irritation test of eco-friendly plasticizer using crude glycerol derived from the biodiesel process. Methods: Glyceroldiacetate laurate(GDL) was synthesized from glycerol monolaurat(GML) and acetic acid. The synthesis of the GDL plasticizer was measured with nuclear magnetic resonance spectroscop(NMR) and FT-IR(Fourier Transform Infrared Spectrometer). To provide information on the safety of GDL, we carried out an oral dose toxicity test for GDL in Sprague-Dawley rats. Also, we carried out a skin irritation test for GDL in New Zealand White rabbits. Results: The oral dose toxicity test in Sprague-Dawley rats showed that GDL is a non-toxic material. The result of the skin irritation test on New Zealand White rabbits showed that GDL is non-irritating. Conclusions: From the results of oral dose toxicity test and skin irritation test, we concluded that the developed plasticizer showed excellent eco-friendly property. Based on our results, we confirmed the development of an eco-friendly non-phthalate plasticizer. Applicability for PVC toys and food and drug packaging materials was found.