• 한국기계가공학회지
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• 제2권3호
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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.

• 공업화학
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• 제16권5호
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• pp.614-619
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• 2005

폴리올, 실리콘 수지, 변성 실리콘 수지 등을 유화제로 유화시켜 수용성 소포제를 제조하였다. 제조한 소포제에 대하여 소포성, 상분리 시간, 점도 등을 측정하였다. PPG 혼합물의 상분리 시간은 PPG 400>PPG 3000>PPG 1000이었다. PPG 1000을 혼합하였을 때는 다른 것에 비하여 뛰어난 소포성을 나타내었다. 실리콘 수지 혼합물의 상분리 시간은 TSF-451-350>TSF-451-200>TSF-451-50이었다. TSF-451-50을 혼합하였을 때는 상용성 부족으로 혼합물의 부피가 증가되었다. 고분자량의 실리콘 수지를 사용할수록 소포성은 좋지 않았다. 변성 실리콘 수지는 물에 잘 분산되었지만 폴리올에 대한 상용성은 좋지 않았다. 유화제에 대한 소포성은 SPAN 20>SPAN 60>SPAN 80의 순이었다. SPAN 80은 실리콘 수지에 대하여 혼합성이 좋지 않았지만 YAS 6406이나 PPG 1000에 대해서는 좋은 혼합성을 나타내었다.

• 분석과학
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• 제17권3호
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• pp.278-281
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• 2004

The separation and concentration method of gold(III) and platium(IV) ions from other ions has been investigated using chelate resin, Amberlite IRC 718 in the mixed solution. The adsorption and desorption capacity of ions on the chelate resin in mixed solution were measured at room temperature. Using the data, gold(III) and platium(IV) ions were separated and concentrated in the ions solution.

• Nuclear Engineering and Technology
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• 제46권6호
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• pp.847-856
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• 2014

Spent resin waste containing a high concentration of $^{14}C$ radionuclide cannot be disposed of directly. A fundamental study on selective $^{14}C$ stripping, especially from the IRN-150 mixed bed resin, was carried out. In single ion-exchange equilibrium isotherm experiments, the ion adsorption capacity of the fresh resin for non-radioactive $HCO_3{^-}$ ion, as the chemical form of $^{14}C$, was evaluated as 11mg-C/g-resin. Adsorption affinity of anions to the resin was derived in order of $NO_3{^-}$ > $HCO_3{^-}{\geq}H_2PO_4{^-}$. Thus the competitive adsorption affinity of $NO_3{^-}$ ion in binary systems appeared far higher than that of $HCO_3{^-}$ or $H_2PO_4{^-}$, and the selective desorption of $HCO_3{^-}$ from the resin was very effective. On one hand, the affinity of $Co^{2+}$ and $Cs^+$ for the resin remained relatively higher than that of other cations in the same stripping solution. Desorption of $Cs^+$ was minimized when the summation of the metal ions in the spent resin and the other cations in solution was near saturation and the pH value was maintained above 4.5. Among the various solutions tested, from the view-point of the simple second waste process, $NH_4H_2PO_4$ solution was preferable for the stripping of $^{14}C$ from the spent resin.

• 한국의류학회지
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• 제13권3호
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• pp.242-251
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• 1989

The purpose of this study was to investigate the changes in easy-care and strength properties of the wet fixation processed viscose rayon fabrics. Rayon fabrics were treated with mixed resins of melamine formaldehyde (MF) and DMDHEU by one bath and two bath wet fixation processes. The MF/DMDHEU mixed resin concentrations were 50/100, 50/150, 100/100, 100/150 and 150/100(g/1). Magnasium chloride was used as a catalyst. Treated fabrics were evaluated by nitrogen content, DP rating, wrinkle recovery angle, breaking strength, tearing strength and abrasion resistance. The properties were compared to the fabrics treated by conventional Pad-Dry-Cure (PDC) method. Wet fixation processed fabrics showed DP ratings of higher than 3 and higher than 275 degrees of wrinkle recovery angles in all the mixed resin concentrations. Wet fixation processed fabrics showed increase in breaking strength and tearing strength but decrease in abrasion resistance. However, the decrease in abrasion resistance was much less than the conventional PDC treated fabrics. The one bath wet fixation processed fabrics showed better physical properties than the two bath processed fabrics in general. The optimum treatment condition was the mixed resin concentration of MF/DMDHEU, 100/100 g/l in one bath wet fixation process.

• Restorative Dentistry and Endodontics
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• 제25권3호
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• pp.313-320
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• 2000

The purpose of this study was to evaluate on the interfacial morphology between dentin and restorative materials. In this in vitro study, the cavity wall restorated with 3 different kinds of tooth colored restorative materials [resin-modified Glass Ionomer cement (Fuji II LC), composite resin (Z-100), compomer (Dyract)]. The thirty extracted human molar teeth without caries and/or restorations are used. The experimental teeth were randomly divided into three groups of ten teeth each. In each group, Wedge shaped cavities (width: 3mm, length: 2mm, depth: 1.5mm) were prepared at the cementoenamel junction on buccal and lingual surfaces. The adhesive of composite resin were mixed with rhodamine B. Primer of composite resin, Prime & Bond 2.1 of Dyract and liquid of Fuji II LC were mixed with fluorescein. In group 1, the cavity wall was treatment with dentin conditioner, and then restorated with Fuji II LC. In group 2, the cavity wall was treatment with Prime & Bond 2.1 and then restorated with Dyract. In group 3, the cavity wall was etching with 10% maleic acid, applied with primer and bonding agent and then restorated with Z-100. The interface between dentin and restorative materials was observed by fluoresence imaging with a confocal laser scanning microscope. The results were as follows : 1. In Glass ionomer group, adaptation of resin modified Glass-ionomer restoration against cavity wall is tight, but the crack formed inside of restoration were observed. 2. In Dyract group, the penetration of resin tag is shorter and the width of hybrid layer is narrower than composite resin group. 3. In Z-100 group, primer penetrated deeply through dentinal tubule. Also bonding agent was penetrated along the primer, but the penetration length is shorter than primer part, and in 3-D image, the resin tag is conical shape and lateral branch is observed.

• Elastomers and Composites
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• 제28권1호
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• pp.13-21
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• 1993

Polyurethane resin was especially mixed with polybutadiene rubbers which had each other different molecular structures and functional groups. Liquid and cure properties were tested experimentally for mixtures. Viscosity of mixtures and drying time were influenced by solubility of thinner and reactivity of rubber. Adhesive strength represented maxium at rubber content $15{\times}22%$ (Wt. % ), and rapidly decreased over 25%. DBTDL(di-n-butyltindilaurate) showed the longest stroage stability.

• Journal of the Korean Wood Science and Technology
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• 제12권1호
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• pp.3-10
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• 1984

본(本) 연구(硏究)는 토란분말(土卵粉末) 및 밀가루 분말(粉末)을 알카리와 반응(反應)시켜 제조(製造)한 접착제(接着劑)를 합판용(合板用)으로 개발(開發)코저 실시(實施)하였다. 토란(土卵) 및 밀가루 접착제(接着劑) 대(對) 요소수지(尿素樹脂)의 비(比)를 각각(各各) 0:100, 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 80:20, 100:0으로 혼합(混合)하여 합판접착(合板接着)에 적용(適用)하였으며 또한 비교실험(比較實驗)을 위하여 요소수지(尿素樹脂)에 대한 통상적(通常的)인 증량방법(增量方法)인 밀가루 분말(粉末) 대(對) 요소수지(尿素樹脂)와의 증량비(增量比)를 10:90, 20:80, 30:70, 40:60, 50:50으로 혼합(混合)한 접착제(接着劑)로 합판(合板)을 제조(製造)하여 그 접착력(接着力)을 비교(比較) 분석(分析)하였다. 토란접착제(土卵接着劑)에 요소수지(尿素樹脂)를 30:70의 비(比)로 혼합(混合)한 것이 상태(常態) 및 내수접착력(耐水接着力)에서 가장 우수한 토란접착제(土卵接着劑)에 요소수지(尿素樹脂)를 혼합(混合)하여 제조(製造)한 합판(合板)의 상태접착력(常態接着力)은 혼합비(混合比) 60:40 까지는 같은 혼합비(混合比)의 밀가루 접착제(接着劑)를 혼합(混合)한 것과 밀가루 분말(粉末)을 증량(增量)한 것보다 높은 값을 나타냈다. 밀가루 접착제(接着劑)에 요소수지(尿素樹脂)에 혼합(混合)한 합판(合板)의 상태접착력(常態接着力)은 밀가루 분말(粉末)을 증량(增量)한 것과 비교(比較)하여 혼합비(混合比) 20:80(밀가루 접착제(接着劑) : 요소수지)까지는 비슷한 값을 보이다가 혼합비(混合比) 30:70에서부터는 높은 값을 나타내고 있다. 토란접착제(土卵接着劑) 및 밀가루 접착제(接着劑)를 요소수지(尿素樹脂)에 혼합(混合)한 합판(合板)의 내수접착력(耐水接着力)은 혼합비(混合比) 40:60(토란(土卵) 및 밀가루 접착제(接着劑) : 요소수지(尿素樹脂)) 까지는 밀가루 분말(粉末)을 증량(增量)한 것보다 훨씬 높은 값을 나타내었다. 토란접착제(土卵接着劑)를 혼합(混合)한 것은 밀가루 접착제(接着劑)를 혼합(混合)한 것과 비교(比較)하여 전혼합비(全混合比)에서 높은 내수접착력(耐水接着力)을 보였다. 밀가루 분말(粉末)을 직접(直接) 증량제(增量劑)로 가용(使用)한 것보다 알카리와 반응(反應)시켜 만든 토란접착제(土卵接着劑) 및 밀가루 접착제(接着劑)를 혼합(混合)한 것이 상태(常態) 및 내수접착력(耐水接着力)을 상당(相當)히 증진(增進)시킬 수 있었는데 이것은 제조(製造)된 접착제(接着劑) 자체(自體)가 접착성(接着性)을 갖기 때문에 나타난 결과(結果)로 생각된다.

• Restorative Dentistry and Endodontics
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• 제12권1호
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• pp.155-163
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• 1986

The purpose of this study was to measure penetration of dye stuff (2% Methylene blue, 2% Hematoxylin, 2% crystal violet and 2% safranin-O) on unfilled resin (Lang Dental MFG Co.) Hipol (Boopyung Dental Chemical Co. Macrocomposite resin) Durafill (Kulzer, Co. Microfilled Composite resin) and Heliosit (Vivadent Co. Microfilled Composite resin) The unfilled resin with dough stage was inserted into plastic tuble (5mm in diameter and 4mm in height) with condensation force of 1000 gr, 2000 gr and without condensation force. Hipol mixed on the mixed pad was inserted into the plastic tube by the same method as the unfilled resin. The microfilled resins which were Durafill and Heliosit were polymerized for 60 seconds with the visible light on each surface of the plastic tube which was upper and lower, under condensation force of 1000 gr, 2000 gr and without condensation force. All specimens were stored in the air for 24 hours, then specimens were immersed in the various kind of dye solution for different period of time (1 hour and 24 hours). These dye-treated specimens were polished horizontally until removing 0.5mm of each surface on the emery paper (#1000), and the dye penetration in the polished surface was measured under the digital microscope (Japan Fosuh). Following results were obtained 1. The penetration of dyes was the most excessive in Durafill and was not influenced on the condensation force and the period of immersion time. 2. All dyes were penetrated into Hipol, and Crystal violet was penetrated most excessively in all dyes. 3. The penetration of dye in all resins was not influenced by the period of immersion time and condensation force. 4. There was no evidence of dye penetration in unfilled resin.

• 분석과학
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• 제23권5호
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• pp.429-436
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• 2010

본 연구는 다양한 종류의 음이온 교환수지와 활성탄으로 구성된 새로운 혼합 수지를 과염소산 이온의 제거에 응용할 경우, 각 흡착제들이 갖는 장점으로 인한 시너지 효과를 얻을 수 있는지 조사하였다. 특히 비군사화 과정에서 발생하는 고 농도의 과염소산 암모늄용액을 대상으로 하였는데, 혼합수지 중단일-기능기 음이온 교환수지와 활성탄의 조합에서 과염소산 이온의 흡착 효율이 향상되었다. 일반적으로는 분리된 흡착조를 이용하여 유기 오염물과 무기 음이온의 제거가 시행되는데 반해, 본 연구에서 시도한 혼합 수지를 사용할 경우 한 번에 동시 제거가 가능하여 제거과정에서 필요한 시간, 공간 및 비용을 감소시키는 효과를 얻을 수 있었다. 또한, 시료 중의 공존 음이온들에 대한 방해효과도 낮고 음이온 교환 수지에 비하여 특별한 단점이 없으며 실제시료에도 효과적으로 응용이 가능하였다.