• Title/Summary/Keyword: 수지 혼합비

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이온교환에 의한 Silica 제거능 연구

  • Yun, Tae-Gyeong;Lee, Gang-Chun;No, Byeong-Il
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2006.05a
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    • pp.278-279
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    • 2006
  • 본 연구에서는 수중 silica 제거에 이온교환수지의 성능이 실험되었다. 음이온 단일수지에 비해 양이온/음이온 혼합수지가 silica제거에 효과적이었고, 혼합수지에서 온도가 높을수록 교환반응속도는 빨랐다. 음이온과 양이온교환능은 용액의 pH를 변화를 측정하여 해석할 수 있었다. 용액에 공존하는 양이온인 $Na^+$는 혼합수지에서 pH변화에 영향을 주는 물질이었고, 이러한 pH의 변화는 silica의 제거능에 영향을 주었다. 각 온도에서 도달된 평형농도로부터 각 수지에 대한 silica의 선택도계수가 측정되었다.

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Effects of UF Resin and Taro Adhesive Mixture on Plywood Bonding Strength (요소수지(尿素樹脂)와 토란접착제(土卵接着劑) 혼용(混用)이 합판(合板)의 접착력(接着力)에 미치는 영향(影響))

  • Lee, Phil-Woo;Park, Heon
    • Journal of the Korean Wood Science and Technology
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    • v.12 no.1
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    • pp.3-10
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    • 1984
  • Taro-UF mixed type resin system was developed for gluing plywoods. The taro adhesive that was activated with sodium hydroxide was mixed with the definite ratios of UF resin adhesive. At the sametime, wheat-UF mixed type resin was also applied with the same method as taro-UF mixed type resin The mixing ratios of taro or wheat adhesive: UF resin were 0:100, 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 80:20, and 100:0 by weight. In addition, the UF resins extended with wheat powder at the extending ratios of wheat powder UF resin, 10:90, 20:80, 30:70, 40:60, and 50:50 by weight, were also used. The dry and wet shear strengths of the plywoods of 30:70 (taro adhesive : UF resin) mixing ratio were highest. The dry shear strengths of the plywoods manufactured with the UF resin-mixing taro adhesive were higher than those of the plywoods with the UF resin-mixing wheat adhesive at 10:90, 20:80, 30:70, 40:60, 50:50, and 60:40 (taro or wheat adhesive: UF resin) mixing ratios. At all mixing ratios, the wet shear strengths of the plywoods manufactured with the UF resin-mixing taro adhesive were higher than those of the plywoods with the UF resin-mixing wheat adhesive. The dry and wet shear strengths of the plywoods manufactured with the UF resin-mixing wheat adhesive were higher than those of the plywoods with the wheat powder-extending UF resin at the mixmg ratios, 10:90, 20:80, 30:70, and 40:60 (wheat adhesive or wheat powder: UF resin). So, it was found that the plywoods manufactured with the UF resin-mixing taro adhesive and the UF resin mixing wheat adhesive had better shear strength than the plywoods with the wheat powder-extending UF resin. It was because the taro adhesive and wheat adhesive themselves took the bonding properties after being activated with alkali.

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Wettability Evaluation of Resin on the Glass Fabric (유리섬유직물에 대한 수지의 젖음성 평가)

  • Han, Seung-Wook;Choi, Nak-Sam;Lee, Min-Soo;Ahn, Hung-Kun
    • Composites Research
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    • v.24 no.2
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    • pp.30-37
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    • 2011
  • Analysis of wettability between epoxy resin and glass fabric was studied. The mixing ratios of epoxy resin and anhydride hardener were varied as 1:0.5, l:l and l:1.2. Catalyst content was fixed as 0.1wt% of the mixed resin. A curing analysis by differential scanning calorimeter(DSC) showed a possible impregnation of the mixed resin at the room temperature. An effective contact angle of the mixed epoxy resin drop onto the glass fabric being preset on a flat glass plate was measured as a function of time. The wet area of the epoxy resin drop was also measured. Behaviors of the contact angle, the droplet height, the neat wet area and the coefficient of wettability were used to evaluate the wettability of the epoxy resin onto the glass fabric. It was concluded that the equivalent ratio of 1: 1.2 was the most suitable for the wettability.

The Effect on Mixed Ratio of Recycled Engineering plastic Resin on the Shrinkage in Molded Parts (엔지니어링 플라스틱 재료의 재활용 혼합비가 성형품 수축에 미치는 영향)

    • Resources Recycling
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    • v.13 no.3
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    • pp.43-49
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    • 2004
  • In this study. an experimental work was performed to mold tensile specimens by using the injection molding machine. Melt temperature, mold temperature and the mixed ratio of recycled resin were selected as processing parameters for studying the effect of those conditions on the shrinkage and weight of molded parts. As a result, the shrinkage was increased with the higher mold and melt temperature and it was more sensitive to the change of mold temperature. On the other hand, the weight of molded parts was decreased with the increment of mold and melt temperature.

The Research about Strength Properties of Recycled High Impact Polystyrene (재활용 고강도 폴리스틸렌(HIPS)의 강도 특성에 관한 연구)

  • Kim, Jong-Soon;Kang, Tae-Ho;Lee, Yong-Yeon;Kim, Young-Soo;Kim, In-Kwan
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2005.05a
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    • pp.113-118
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    • 2005
  • Recycle methodology was researched on the HIPS(High Impact Poly Styrene) materials which are used in modern industry widely, For the various mixing ratio between virgin pellets of HIPS and recycled ones, tensile strength and shrinkage ratio were analyzed with injection molding experiments and numerical simulations. In addition, the deviations of dimensional accuracy were observed in accordance with various molding conditions. Molding conditions such as mold and melt temperature were changed by 3 steps. Mixing ratio between virgin pellets of HIPS and recycled ones were under controlled with 15%, 30% and 45%.

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The Effect on Recycled resin Ratio of High Density Polyethylene on the Molded Parts (高密度 폴리에틸렌 材料의 再活用 混合比가 成形品에 미치는 影響)

  • Kang, Tae-Ho;Kim, In-Kwan;Kim, Young-Soo
    • Resources Recycling
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    • v.13 no.5
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    • pp.23-27
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    • 2004
  • In this study, experimental work was performed to mold tensile specimens by using the injection molding machine. Melt temperature, mold temperature and the mixed ratio of recycled resin were selected as processing parameters for studying the effect of those conditions on the shrinkage, weight, absorption, and tensile strength of molded parts. As a result, the shrinkage was increased according to the higher mold and melt temperature and it was more sensitive to the change of mold temperature. On the other hand, the weight of molded parts was decreased due to the increment of mold and melt temperature. Tensile strength was increased with mold and melt temperature, and it was also easy to change by mold temperature.

An Experimental Study on Spontaneous Combustion Risk of M.E.K (M.E.K(경화제)의 자연발화 위험성에 관한 실험적 연구)

  • Kim, Jung-Hyun;Yoo, Yong-Ho;Kweon, Oh-Sang;Yoo, Myong-Youl
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2011.11a
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    • pp.470-473
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    • 2011
  • 본 연구에서는 산업현장에서 에폭시 강화촉진제, 도로용 첨가제 등으로 많이 사용되고 있는 경화제(M.E.K)의 혼합비에 따른 자연발화 위험성을 알아보고 산업 현장의 화재 예방을 위한 기초자료로 제공하고자 하였다. M.E.K와 에포비아 수지를 각기 다른 비율로 혼합한 상태에서 시간경과에 따른 시료의 온도변화 와 유증기 발생 및 자연발화 여부를 관찰한 결과 합성수지와 경화제의 혼합시 경화제가 5% 이상으로 혼합될 경우 혼합 수지의 내부온도가 약 $40^{\circ}C$ 이상으로 상승하면서 발포 현상과 함께 다량의 유증기가 발생하였고, 유증기가 발생된 모든 조건에 대하여 자연발화 여부는 확인할 수 없었다.

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Cure Kinetics, Thermal Stabilities and Rheological Properties of Epoxy/phenol Resin Blend System Initiated by Cationic Thermal Latent Catalyst (양이온 열잠재성 개시제에 의한 에폭시/페놀 수지 브랜드 시스템의 경화 동력학.열안정성 및 유변학적 특성)

  • 박수진;서민강;이재락
    • The Korean Journal of Rheology
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    • v.11 no.2
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    • pp.135-142
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    • 1999
  • The effects of 1 wt.% N-benzylpyrazinium hexafluoroantimonate (BPH) as a thermal latent initiator and blend compositions composed of 0, 5, 10, 20 and 40 wt.% of phenol-novolac resin to epoxy resin were investigated in terms of cure kinetics, thermal stabilities and rheological properties. Thermal latent properties of BPH were measured from the conversion as a function of reaction temperature on a dynamic DSC. This cationic BPH system turned out to be an effective thermal latent initiator in the epoxy-phenol curing system. And the increase of phenol-novolac resin concentration led to the decrease in the latent temperature and to the increase of cure activation energy ($E_a$) of the blend system. The thermal stability and activation energy ($E_t$) for decomposition, gel-time and activation energy ($E_c$) for cross-linking from rheometer increased within the composition range of 20~40 wt.% of phenol-novolac resin. This implies that the three-dimensional cross-linking may take place among hydroxyl group within phenol resin, epoxide ring within epoxy resin and BPH.

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The Effect of Mixed Rate of Recycled Resin on the Shrinkage in Molded Parts (재활용 플라스틱 재료의 혼합비가 성형품 수축에 미치는 영향)

  • Kim, Young-Soo;Kim, In-Kwan;Kang, Tae-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.3
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    • pp.62-68
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    • 2003
  • In this study, an experimental work was performed to mold tensile specimens by using the injection molding machine. Melt temperature, mold temperature and the mixed rate of recycled resin were selected as processing parameters for studing the effect of those condition on the shrinkage and weight of molded parts. As a result, the shrinkage was increased with the higher mold and melt temperature and It was more senstive to the change of mold temperature. On the other hand, the weight of molded parts was decreased with the increment of mold and melt temperature.

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음이온교환수지를 이용한 백금족 금속의 분리 및 정제 연구(I) - 상용 강염기성 음이온 교환수지의 흡착연구 -

  • 김유선;이성호;안도희;김광락;백승우;강희석;이한수;정흥석
    • Proceedings of the Korean Nuclear Society Conference
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    • 1997.05b
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    • pp.345-349
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    • 1997
  • 고준위 방사성 액체폐기물에서 얻어지는 백금족 금속(Pd, Rh, Ru) 들의 분리 및 정제방법으로 강염기성 음이온교환수지를 사용하여본 결과 상용 수지중에서 Dowex 1 $\times$ 8 이 IRN-78 에 비하여 저 농도의 질산 농도에서 Pd(II) 의 분리 및 정제시 우수한 흡착성을 보여 주었으며 Rh(III) 의 흡착은 Pd(II) 의 것보다 훨씬 낮은 값을 보여 주었다. 이 수지들의 백금족 금속에 대한 흡착성을 문헌에 보고된 실험 결과들과 비교 검토하여 본 바 이온 그룹으로 3급 및 4급 Benzimidazole을 가지는 수지에 비하여 훨씬 낮은 값을 나타내었다. 따라서 실용성이 큰 강염기성 음이온수지로서는 Benzimidazole과 같은 혼합 아민 그룹을 지닌 수지가 가장 접합할 것으로 전망되었다.

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