• Title, Summary, Keyword: siloxane

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Effect of Landfill Site Characteristics on Siloxane Production in Landfill Gas (매립지 특성이 매립가스 내 siloxane 발생에 미치는 영향)

  • Nam, Sangchul;Kang, Jeong-Hee;Hur, Kwang-Beom;Lee, Nam-Hoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.19 no.3
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    • pp.44-53
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    • 2011
  • Siloxane, organo-silicon compound, is used in the various forms of products such as cosmetics and detergents due to its quality physical chemistry attributes. Siloxane included in landfill gas which is caused in the process of decomposing of such products after landfill has imposed negative impacts on the operation of landfill gas utility facilities. The objective of this study was to investigate the siloxane production characteristics depending on the features of various landfill site in Korea so that the analysis was made on the landfilling age and landfill waste by in terms of its concentration, structure and composition. As for the concentration of siloxane depending on time passage, 12 landfill sites were reviewed by landfilling age. As for production attributes change of siloxane by landfill wastes, the source of wastes, physical production ration and siloxane concentration were compared in 6 landfills. The average concentration of total-siloxane within LFG is $6.75mg/m^3$ and cyclic-siloxane out of it occupies over 93%. By element, D4 and D5 in order take the highest proportion regardless of total-siloxane concentration and landfilling age. Even though this study is not able to verify the different impact of each kind of wastes on the generation of siloxane, it is confirmed that total-siloxane and cyclic-siloxane decrease in line with the increase of landfilling age as it does in the first order decay model for landfill gas.

Characteristics of Siloxane Concentrations in Bio Gas from Anaerobic Digestion of Food Wastewater (음식물류폐기물폐수의 혐기성 소화에서 바이오가스의 실록산 농도 특성)

  • Lee, Chae-Young;Lee, Se-Wook;Park, Su-Hee;Hur, Kwang-Beom;Kim, Hae-Ryong;Lee, Nam-Hoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.19 no.4
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    • pp.60-65
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    • 2011
  • Siloxane is an organic silicon compound and is volatilized into the bio gas from anaerobic digestion. It causes failure of gas combustion engines using the bio gas. Siloxane emission characteristics should be identified to provide a proper siloxane control. This study focuses on characterizing siloxane emission in bio gas from an anaerobic digester of food wastewater operating from January to March. The concentrations of total average siloxane and cycle-siloxane D4 were detected to be 9.5 and $4.0mg\;siloxane/m^3$, respectively. The concentrations of cycle-siloxane and linear-siloxane were resulted in D4>D5>D6 and L4>L3>L5>L2, respectively. The total siloxane concentration was the lowest in January and the highest in March.

Experimental Study of the Adsorption Characteristics of Commercial Adsorbents for Mixed Siloxane Compounds using FTIR (FTIR을 이용한 상용 흡착제의 바이오가스 실록산 흡착 특성에 관한 실험적 연구)

  • Park, Jungkeuk;Hur, Kwangbeom;Lee, Jungkeun;Lee, Namhoon
    • Journal of Korea Society of Waste Management
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    • v.35 no.6
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    • pp.533-540
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    • 2018
  • Removal of siloxane compounds is very important to protecting the biogas energy conversion system from decreased efficiency and parts damage. Among various siloxane removal technologies, adsorption towers are mostly used for performance and ease of operation. However, due to the difficulty of measuring the concentration of siloxane compounds in the gas stream and the complicated matrix of siloxane compounds, adsorption characteristics are not well known. In this study, the adsorption characteristics for multi siloxane components are experimentally studied. Four siloxane components are vaporized in the nitrogen stream supplied continuously to a lab-scale adsorption tank with commercially available silica gel or activated carbon and an FTIR (Fourier-transform infrared spectroscopy) analyzer was used for the online siloxane analysis to find out the adsorption characteristics. While a mixture of L2, L5, D4 and D5 adsorption capacity of silica gel and activated carbon are similar -11.13 and 11.56wt% respectively-adsorption characteristics of each adsorbent was well distinguished in terms of breakthrough behavior. Silica gel shows sequential breakthrough for each siloxane compound and a more noticeable unique time range for Rc > 1, while relatively simultaneous breakthrough was shown for activated carbon adsorbents.

A Study on Dielectric Strength and Insulation Properly of PDMS (실리콘 폴리머의 내전압 및 절연특성에 관한 연구)

  • 지원영
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.11
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    • pp.941-946
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    • 2001
  • The fundamental study on HTV silicone for insulation material has been performed. In order to estimate the chemical behavior of siloxane under high voltage, H-NMR, GPC and vinyl contents measurement were used. As an experimental results, after high voltage stress, the molecular weight of siloxane are increased, the vinyl contents of siloxane are decreased. The dielectric strength of vinyl group containing siloxane was lower than only methyl containing siloxane.

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Synthesis and characterization of silicone-containing polyamideimide and its gas separation

  • 이용범;심진기;이영무
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.83-84
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    • 1997
  • 1. INTRODUCTION : Polyimides containing siloxane moiety(poly(imide siloxane), or polysiloxaneimide) have been synthesized because of their some merits over polyimide itseft. Polyimides have excellent thermal and mechanical properties but their poor solubility and processibility in their fullly imidized form give disadvantages in applications. Incorporation of siloxane units make it possible to increase solubility and processibility, and also impart impact resistance, low moisture uptake, low dielectric constant, thermo-oxidative resistance, good adhesion properties to substrate and etc.. Incorporation methods of siloxane groups into the polyimide was mainly copolymerization or terpolymerization between oligomeric dimethylsiloxane and aromatic dianhydride. A few methods of introducing siloxane units in functional groups of polyimide was reported. In our laboratory poly(amideimide siloxane) and poly(imide siloxane) were prepared and the study about their thermal kinetics was performed. In separation membrane area, polysiloxaneimides was utilized in pervaporation and gas separation. Polyimides in gas separation show high selectivity and very low permeability, and introduction of siloxane segments increase permeability with low decrease in selectivity. We aimed to introduce silicone segments into poly(amic acid) state and synthesize polymer partially imidized, and also show the gas separation characteristics of the synthesized polymer.

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Synthesis and Properties of Siloxane Containing Copolyimides (실록산이 함유된 폴리이미드의 합성과 물성)

  • Moon, Yoon-Duk;Lee, Young Moo
    • Applied Chemistry for Engineering
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    • v.2 no.4
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    • pp.340-347
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    • 1991
  • Siloxane containing copolyimide (SPI) was synthesized from 3, 3', 4, 4'-benzophenonetetracarboxylic dianhydride(BTDA), 4, 4'-methylene dianiline(MDA), 4, 4'-oxydianiline(ODA) and amine-terminated polydimethyl-siloxane(PDMS). Homopolyamic acid(HPAA) in tetrahydrofuran(THF) was reacted with PDMS to obtain siloxane containing polyamic acid(SPAA) followed by the thermal curing to manufacture SPI. SPAA and HPAA exhibited inherent viscosity value of 0.35~0.48dl/g. Glass transition temperature of SPI ranged in $258^{\circ}C{\sim}264^{\circ}C$. SPI had a lower $T_g$ than that of HPI. ODA based HPI and SPI showed slightly higher $T_g$ values, thermal stability, and water content.

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The Effect of Epoxy and Epoxy-Siloxane Emulsion Treatment on the Anticrease Property of Silk Fabrics (Epoxy 및 Siloxane Emulsion 처리가 견직물의 방추성에 미치는 영향)

  • 장병호;신광호;이병학
    • Textile Coloration and Finishing
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    • v.5 no.1
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    • pp.10-18
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    • 1993
  • Epoxy compound was synthesized from bisphellol-A with epichlorophydrine. Epoxy compound and siloxane were emulsified conjugative one or another. The water repellency of silk fabrics was also highly improved by the treatment of epoxy-siloxane mixed emulsions containing stannic chloride and zirconium oxychloride. The maximum wrinkle recovery was obtained from the fabrics treated under the condition 2.5%-epoxy-siloxane emulsion at 16$0^{\circ}C$. The breaking elongation, the reflectance, the tensile strength and the bending properties of silk fabrics were not degraded severely by the treatment of epoxy-siloxane emulsion.

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Synthesis of Hard Coating Solution for Plastic Display Plate (플라스틱 디스플레이 기판용UV 하드 코팅 용액의 합성)

  • Back, Sung Kyun;Jang, Sun Ho;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.1
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    • pp.45-51
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    • 2017
  • Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer netwoked nanoparticles were prepared to synthesize hard coating solution by reaction with diisocyanates. The diisocyanate combined siloxane hard coating solution showed more flexibility than the siloxane solution. In addition, diisocyanate resulted in improvement of curl property and surface hardness in the siloxane solution. Of the used diisocyanates, isophorone diisocyanate and acryloyloxy ethyl diisocyanate were good for UV hard coating solution. This effect will decrease brittleness in the siloxane solution using for plastic display plate.

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Preparation and Adhesive Properties of Acrylate Copolymer with Siloxane Group (실록산기를 함유한 아크릴 공중합체의 제조 및 점착특성)

  • Yoon, Keun-Byoung;Noh, Young-Joo;Lee, Dong-Ho
    • Applied Chemistry for Engineering
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    • v.18 no.2
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    • pp.121-125
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    • 2007
  • Siloxane monomer and oligomer were introduced to n-butyl acrylate and methyl methacrylate copolymer for improvement of water resistance and tactile sensation of acryl-type emulsion. Terpolymerimerization of n-butylacrylate, methyl methacrylate and siloxane monomer or oligomer was carried out in aqueous solution. The glass transition temperature (Tg) of terpolymer decreased with increasing siloxane monomer, however, the Tg of terpolymer increased with increasing siloxane oligomer due to the crosslinking of acrylated end group. The adhesion property and surface energy of the obtained terpolymer decreased with introducing siloxane monomer or oligomer in terpolymer. Decrement of tack and surface energy means the enhancement of water resistance and tactile sensation of the emulsion.