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폼알데하이드 흡착능에 대한 커피부산물의 열처리 조건 영향
안세희 ( Sye Hee Ahn ) 한국목재공학회 2015 목재공학 Vol.43 No.3
This study was conducted to examine the potential use of coffee waste (CW) as an adsorbent of HCHO by adding into fiberboard. For the purpose, CW treated with various temperatures and times was placed in desiccator with a HCHO solution and then the HCHO adsorptivity of the CW was measured by acetylacetone (ATAN) and DNPH methods. In the results of ATAN analysis, amount of HCHO adsorbed in distilled water was the lowest on the non-treated CW and steadily increased to 100℃-treated temperature. However, over the 100℃, heating temperature (H-Temp) had not an effect on the HCHO adsorptivity of CW. Amount of HCHO adsorbed on CW itself was the highest at 100℃ H-Temp, following by 50℃, 150℃, 0℃, 250℃ and 200℃. For the HCHO adsorptivity of CW measured by DNPH methods, HCHO was not detected in the distilled water stirred with non-treated CW, but detected from the distilled water stirred with heating-treated CW. The content was the highest in the CW heating-treated at 100℃ for 10 min. In addition, HCHO adsorbed on CW itself increased to the H-Temp of 100℃ regardless of heating time, but decreased or reduced greatly degree of the increase over 100℃ H-Temp. In conclusion, optimal heating conditions of CW for the HCHO adsorption might be H-Temp between 100 and 150℃ with 10 min according as technical and economical reasons. Heating-treated CW manufactured with above the conditions can be used as an adsorbent in conventional fiberboard production for reducing HCHO emssion.
안세희 ( Sye Hee Ahn ),전문장 ( Mun Jang Jeon ),엄영근 ( Young Geun Eom ),오세창 ( Sei Chang Oh ),이미림 ( Mi Rim Lee ) 한국목재공학회 2011 목재공학 Vol.39 No.1
The pine wilt disease is one of the most serious forest diseases that kill the pine trees, and the study on the invasion and movement of the pine wood nematode within the tree is very important for understanding the inhabitation of pine wood nematode. In this relation, the microscopic observation was carried out to study the place of inhabitation and movement of pine wood nematode within the infested wood. In result, the rays were mainly infested by pine wood nematode and showed dark discoloration due to their necrosis in cross, radial and tangential surface. Also, the intensive damage was found in the resin canals. On the other hand, some traumatic resin canals in tangential band were identified in the sapwood near the cambium. In the ray, the pine wood nematode occurred more commonly in the ray parenchyma cell and fusiform ray with horizontal resin canal than in the ray tracheid and uniseriate ray without horizontal resin canal, respectively. The pine wood nematode was thought to move from ray to tracheid through the large natural opening, window-like pit, in the cross-field, neither through the small natural opening, bordered pit, in the tracheid nor through the tracheid wall by creating a bore hole.
습도반복처리조건하에서의 목질재료의 내구성능평가 ( I )
안세희(Sye-hee Ahn),오세창(Sei-Chang Oh) 한국가구학회 1998 한국가구학회지 Vol.9 No.1
Bending test were carried out on nominal 15mm thick commercial Plywood, MDF and Particleboard under alternating humidity conditions (40%-80%) with constant temperature of 20 C. Specimens were prepared with a set of notched and unnotched conditions and tested using midspan loading. By the test results, retention of flexural strength, MOE and fracture toughness were calculated. Typical load-deflection curves were different in3 types of tested specimens respectively, and especially linear to fracture in PB. Time to fracture in MDF was longer than Plywood and PB. The retension of flexural strength of un notched specimens varied in each cycle, and MOE was decreased considerably in PB and MDF panels. Stress concentratjon factor and critical stress intensity factor were decreased as the cycles were repeated, especially after 3~4th cycle, The effect of alternating humidity conditions on panel performance was higher in PB panels than in plywood and MDF panels. This study will offer the convenience of comparing the behavior of wood-based panels under cyclic humidity conditions by means of fracture toughness and retention of performance.
정한섭,김호용,안세희,최인규,오세창,한규성,양인,Jeong, Han-Seob,Kim, Ho-Yong,Ahn, Sye-Hee,Choi, In-Gyu,Oh, Sei-Chang,Han, Gyu-Seong,Yang, In 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.5
두부비지를 이용한 친환경적인 목재방부제를 조제하고, 두부비지 가수분해에 사용하는 산의 농도 및 염의 구성에 따른 방부능의 영향을 조사하는 실험을 수행하였다. 두부비지 방부제는 $25^{\circ}C$에서 1시간 동안 0, 1%, 그리고 2% 황산에 의해 가수분해된 두부비지와 염화구리 또는/그리고 붕산나트륨으로 조제되었고, 목재시편 내에 감가압법으로 주입하여 주입된 시편을 $70^{\circ}C$ 열수에서 72시간 동안의 용탈실험을 거친 후, 갈색부후균 Trametes palustris 및 백색부후균 Tyromyces versicolor에 대한 내후성을 조사하였다. 실험결과 두부비지를 가수분해한 산의 농도가 높아짐에 따라 방부제의 주입능과 내후성이 증가하였고, 용탈성은 감소하였다. 두부비지산 가수분해물/구리염 또는 두부비지 산 가수분해물/구리염/붕소염으로 처리된 목재시편은 T. palustris 및 T. versicolor에 대한 우수한 방부효능을 보였으나, 두부비지 산 가수분해물/붕소염 또는 두부비지가 포함되지 않은 방부제로 처리된 목재시편은 T. palustris에 의한 부후가 관찰되었다. 상기 결과를 토대로 1% 황산에 의해 가수분해한 두부비지, 염화구리 그리고 붕산나트륨으로 조제한 목재방부제가 두부비지를 이용한 목재방부제 조제의 최적 조건으로 평가되었다. This research was carried out to formulate environmentally friendly wood preservatives with okara and to investigate the effects of the acid concentration used for the hydrolysis of okara and salt type on the decay resistance of the preservatives. Okara-based preservatives were formulated with okara hydrolyzates, which were prepared with 0, 1%, and 2% sulfuric acid at $25^{\circ}C$ for 1 hr, and salts such as copper chloride and/or sodium borate. The preservatives were treated into wood blocks by vacuum-pressure method, and then the treated wood blocks were leached in $70^{\circ}C$ hot water for 72 hrs. The fungal treatments of the leached wood blocks were conducted by brown-rot fungus, Tyromyces palustris, and white-rot fungus, Trametes versicolor, to examine the decay resistance of the preservatives. As the acid concentration used for hydrolysis of okara increased, the treat-ability and decay resistance of the preservatives were improved, which the leachability was decreased. Wood blocks treated with the okara/copper or okara/copper/borax, showed very good decay resistance against T. palustris and T. versicolor. However, wood blocks treated with the okara/borax and okara-free preservative solutions, were observed the fungal decay by T. palustris. The optimal conditions for the preparation of okara-based wood preservatives were formulated with okara hydrolyzed with 1% sulfuric acid, copper chloride and borax.
미·이용업 폐기물 인모의 목재접착제 원료화 가능성 탐색
양인 ( In Yang ),안세희 ( Sye Hee Ahn ) 한국목재공학회 2017 목재공학 Vol.45 No.5
Human hair (HH) is produced as a waste from beauty parlor and barbershop. HH-based adhesives were formulated with NaOH-hydrolyzed HH, H<sub>2</sub>SO<sub>4</sub>-hydrolyzed chicken blood (CB) and PF as a crosslinking agent. Physicochemical properties and retention rate against hot water of the adhesives were measured to investigate the potential of HH as a raw material of wood adhesives. HH was composed of keratin-type protein of 80% and over. Ash of less than 0.1% was contained in HH. Among the amino acids included in HH, glutamic acid showed the highest content, followed by cysteine, serine, arginine and threonine. Solid content of the adhesives ranged from 33.2% to 41.8% depending on hydrolysis conditions of HH and PF type. Viscosity at 25℃ ranged from 300 to 600 mPa·s resulting in a sprayable adhesive. Retention rate against hot water measured to evaluate the water resistance of adhesives was the highest in the cured resin formulated with 5% NaOH-hydrolyzed HH and 5% H<sub>2</sub>SO<sub>4</sub>-hydrolyzed CB. Meanwhile, the molar ratio of formaldehyde to phenol in PF did not have a significant impact on the retention rate of HH-based adhesives. When the retention rates of HH-based adhesives were compared to those of conventional wood adhesive resins used for the production of wood-based panels extensively, HH-based adhesives formulated with 30 wt% PF showed lower retention rate than commercial urea-formaldehyde resin. However, when PF content was increased to 35 wt%, the retention rate greatly increased and approached to that of commercial melamine-urea-formaldehyde resin. Except for the results mentioned above, the analysis of economic feasibility suggests that HH-based adhesives can be used for the production of wood-based panels if HH is hydrolyzed in proper conditions and then the HH-based adhesives are formulated by the HH hydrolyzates with 35 wt% PF.