• 제목/요약/키워드: Polyvinyl Chloride(PVC)

검색결과 166건 처리시간 0.023초

Development of Reagent Solution for Identifying the Chloride-based Packaging Materials (염소계 합성수지 포장재 식별용 진단시약 개발)

  • Oh, Jae Young
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • 제19권3호
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    • pp.139-141
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    • 2013
  • In respect of environmental hazard or human safety, the use of the chloride-based packaging materials like polyvinyl chloride (PVC) blister and film, Polyvinylidene chloride (PVDC) laminated film has been restricted with national regulations. In this study, I intended to develope the reagent solution for identifying the chloride-based packaging materials, so that it was made by mixing methanol ($CH_3OH$) saturated with sodium hydroxide (NaOH) and pyridine as solvent with same ratio. The efficacy of this reagent solution was verified by the analysis of chemical mechanism and experiments that showed the color change (brown) of the specimens. This analysis methode using reagent solution is so simple, convenient, inexpensive and immediate that I expect it will be useful in the field of packaging.

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A Study on the Noise and Condensation Characteristics of Complex Structure Drainage Pipe Materials (복합 구조형 배수 배관재의 소음 및 결로 특성에 관한 연구)

  • Kim, Jae-Dol
    • Journal of Power System Engineering
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    • 제20권5호
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    • pp.72-77
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    • 2016
  • The present study investigates noise and condensation characteristics of polyvinyl chloride (PVC), which is widely used for drainage piping materials, complex double structure by comparing to those of PVC single structure piping materials. In addition, effects of insulation on drainage noise has been measured experimentally. As the results of the experiments, noise reduction effect of PVC complex double structure is superior to that of PVC single structure in terms of elbow and vertical piping materials which are employed for drainage pipes of toilet bowls and bathtub. The insulation barely have effect on the noise reduction in case of the PVC single structure since there is almost no changes in noise occurrence even though the insulation is applied on both elbow and vertical piping materials. Temperature differences between inside and outside of the pipes have been measures for the PVC single and complex double structures as well. In consequence, outside temperature of the PVC complex double structure is higher than that of the PVC single structure. The condensation occurrence time of the PVC complex double structure shows a distinct difference from that of the PVC single structure, thus, the PVC complex double structure has outstanding effect on preventing the condensation.

Antistatic Finishing of PVC Film Treated with Corona Discharge (Corona방전처리에 의한 PVC film의 대전방지가공)

  • 허만우;이창재;김성일;강인규;이두현;양희삼;김삼수
    • Textile Coloration and Finishing
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    • 제10권3호
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    • pp.43-49
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    • 1998
  • Polyvinyl chloride (PVC) sheets were treated with corona discharge to produce peroxy radicals on the surfaces. The peroxy radicals formed on the PVC surfaces were subsequently used as initiators for the graft polymerization of acrylic acid or acrylamide in an aqueous solution. Introduction of acrylic acid and acrylamide on the PVC sheet could be confirmed by the observation of carbonyl and primary amine absorptions based on carboxylic acid and amide, respectively. The water contact angle$(90^\circ)$ of PVC sheet was constant, irrespective of time, while corona-treated and functional monomer-grafted PVCs were slowly increased with time, showing the rearrangement of surface polar groups in air condition. The water contact angle of PVC sheet$(90^\circ)$ was decreased by corona treatment$(78^\circ)$, and further decreased by the grafting of acrylic acid$(55^\circ)$ and acrylamide$(56^\circ)$ , indicating increased hydrophilicity of the modified surfaces. The half-life periods of surface voltage on acrylic acid- (62 sec) and acrylamide-grafted PVC (147sec) were significantly decreased when compared to those on PVC (3,115 sec) and corona-treated PVC (463sec). These results mean that acrylic acid- and acrylamide-grafted PVCs could be used as the antistatic sheets.

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Characterization of Water Vapor Transmission & Dielectric Breakdown in Insulation Materials for Jacket Compound (자켓 컴팍운드용 절연재의 수증기투과 및 절연파괴 특성)

  • 송재주;한재홍;송일근;한용희;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 한국전기전자재료학회 2001년도 추계학술대회 논문집
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    • pp.52-56
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    • 2001
  • Experiments of 2 type on insulating compounds accomplished to change PVC using in URD(Underground) power cable jacketing. one was DB(Dielectric Breakdown) test on the pure base resins and the others were WVT(Water Vapor Transmission) test on the compounds which contained C/B(Carbon Black), anti-oxidant to base resin. a kind of specimens made by pressing to resin of pellet or lump form was HDPE(High Density Polyethylene), MDPE(Medium Density Polyehylene), LDPE(Low Density Polyethylene), LLDPE(Linear Low Density Polyethylene), PVC(Polyvinyl Chloride). As a results of AC DB and WVT test, we saw that strength of Insulation was HDPE> LLDPE = MDP E> LDPE and WVT ratio was HDPE

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Elution of Plasticizer fvom PVC Sheet in Alkaline Solutions (알카리수용액중에서 PVC Sheet로부터 가소제의 추출)

  • 신선명;전석호;한오형
    • Resources Recycling
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    • 제11권2호
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    • pp.14-19
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    • 2002
  • PVC sheet was treated in O~10M NaOH solutions at $80~150^{\circ}C$ for O~7 hour, in order to study the leaching phenomena of plasticizer. The yield of phthalic acid produced by hydrolysis of DOP was increased greatly with increasing temperature and NaOH concentration by accelerating of alkali catalyst. The yield of phthalic acid was reached ca. 100% in 10M NaOH at $150^{\circ}C$ over 3 hours. Therefore, the plasticizer containing 30% in PVC sheet could be hydrolyzed in alkali solutions before the occurrence of dehydrochlorination. Besides, in the thermal reaction, the pores were produced in the PVCsheet by the hydrolysis of DOP.

Flame Retardancy and Thermal Properties of PVC/ATH Composites Prepared by a Modular Intermeshing Co-rotating Twin Screw Extruder

  • Lee, Hyeongsu;Park, Se-Ho;Lee, Jae-Yeul;Park, Yuri;Jeong, Hobin;Jhee, Kwang-Hwan;Bang, Daesuk
    • Elastomers and Composites
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    • 제51권2호
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    • pp.147-153
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    • 2016
  • Polyvinyl chloride (PVC) has been used as a general-purpose polymer because of its lower cost, good durability and mechanical properties compared to other materials. However, PVC is vulnerable to heat deformation and generates a toxic gas like hydrogen chloride. Therefore, it is important to delay or prevent the flame retardancy and thermal degradation of the PVC during the processing. It was reported that aluminum trihydroxide (ATH) improved flame retardancy as well as smoke inhibition of the virgin polymer. In this study, PVC composites by addition of ATH were compounded in a modular intermeshing co-rotating twin screw extruder. The PVC composites with different concentrations of ATH (0~5 phr) were analyzed. Flame retardancy of the PVC composite significantly increased depending on the ATH concentration. LOI of the composite also increased with the concentration of ATH. There were no significant differences for the thermal properties of the PVC composites with ATH.

Study on manufacturing mechanism of functional carbon membrane (기능성 카본막의 제조 Mechanism에 관한 연구)

  • Bae, Sang-Dae
    • The Journal of the Convergence on Culture Technology
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    • 제4권2호
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    • pp.211-216
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    • 2018
  • Separation technology combining adsorption and membrane is expected to be applied in many fields such as water treatment. In this fusion technique, a functional carbon membrane having a carbon whisker grown on the surface of the membrane was developed to inhibit membrane fouling, which is a problem in the membrane separation process. In this study, to elucidate the mechanism of manufacturing the functional carbon membrane, the membrane was pretreated with the polymer latex of each mixing ratio and the membrane was formed by the CVD (Chemical Vapor Deposition) method. The membrane was analyzed by scanning electron microscope (SEM), CHN analyzer (Elemental Analyzer), and X-ray diffraction (XRD). As a result, the diameter and density of carbon whiskers were higher in case of polyvinyl di-chloride (PVdC): polyvinyl chloride (PVC) = 4.5: 55. It seems possible to control the diameter and density of the carbon whiskers according to the hydrogen content of the polymer latex.

Removal of Sr and Cs Ions in Aqueous Solution by PVC-Zeolite Composite (PVC-Zeolite 복합체에 의한 수용액 중의 Sr 이온과 Cs 이온의 제거)

  • Lee, Chang-Han;Lee, Min-Gyu;Min, Seong-Kee
    • Journal of Environmental Science International
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    • 제24권9호
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    • pp.1145-1153
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    • 2015
  • PVC-Zeolite composite was prepared by immobilizing zeolite with polyvinyl chloride (PVC). The prepared PVC-Zeolite beads were characterized by using X-ray diffractometer (XRD), fourier transform infrared spectrometer (FTIR), thermo gravimetric analyzer (TGA), and scanning electron microscopy (SEM). The removal properties of Sr and Cs ions from aqueous solution were investigated in batch experiment. The removal efficiencies of Sr and Cs ions by the PVC-Zeolite beads were dependent on the initial pH of solution. The removal efficiencies sharply increased at below pH 4 and was kept constant at pH 4 or more. The adsorption kinetics of Sr and Cs ions by the PVC-Zeolite beads were fitted well by the pseudo-second-order model ($r^2$>0.99) more than pseudo-first-order model. The maximum adsorption capacities of Sr and Cs ions calculated from Langmuir isotherm model were 39.37 mg/g and 55.87 mg/g, respectively.

Harmful Chemicals Migrating from Plastic Hoses Using Household into Tap Water (가정용 고무호스에서의 유해화학물질 용출)

  • Bae, Seok-Mun;Son, Hee-Jong;Jeong, Hyun-Chul;Choi, Jin-Taek;Bin, Jae-Hoon
    • Journal of Korean Society of Environmental Engineers
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    • 제32권9호
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    • pp.900-904
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    • 2010
  • Polyvinyl chloride (PVC) hoses, polyethylene hose and silicone hose for tap water were tested with respect to migration of phenolic compounds to water. The highest concentrations (0.36~1.97 mg/L) of total phenolic compounds were observed in the test water from PVC hoses. Increasing residual Cl concentration from 0 to 0.5 mg/L or increasing water temperature from 4 to $25^{\circ}C$ increased 3~3.2 times and 100~104 times for migrated total phenolic compounds concentrations, in respectively. A major migrating phenolic compounds from PVC hoses were bisphenol-a (BPA) and it was observed that the concentration of migrating phenolic compounds in the order: DEHP > 2-chlorophenol > 2,4,6-trichlorophenol > 2,4-dichlorophenol from PVC hoses.

Mechanical Properties and Thermal Stability of Waste PVC/HDPE Blend Prepared by Twin-screw Extruder

  • Lee, Rami;Park, Se-Ho;Baek, Jong-sung;Kye, Hyoungsan;Jhee, Kwang-Hwan;Bang, Daesuk
    • Elastomers and Composites
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    • 제54권1호
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    • pp.7-13
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    • 2019
  • Recycling of waste polyvinyl chloride plastics has attracted much attention due to environmental problems, but the poor mechanical properties, low thermal stability, frequent breakage of strands, and melt cracking of the waste plastics have limited their widespread use. To overcome these disadvantages of waste PVC (W-PVC), recycled PVC powder blend was prepared by adding high-density polyethylene (HDPE) and ethylene vinyl acetate (EVA) as a heat stabilizer and compatibilizer, respectively. An intermeshing co-rotating twin screw extruder was used to prepare the blend, and the characteristics of the blend were analyzed by SEM and TGA, and by using a UTM and Izod impact tester. The impact strength was improved as the EVA content increased for the W-PVC/HDPE (80/20 wt%) blend. As the HDPE and EVA contents increased in the W-PVC/HDPE/EVA blend, the impact strength increased. SEM observations also revealed the improved interfacial adhesion for the EVA-containing blend.