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- 저자 : 박병대 ( Byung-dae Park ) (검색결과 24 건)
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박병대,박종영,Park Byung-Dae,Park Jong Young 한국가구학회 2004 한국가구학회지 Vol.15 No.2
This paper attempted to review measuring methods of formaldehyde emission from wood-based panel products. Methods included for the discussion were desiccator methods, extraction method, and various chamber methods. First, the procedures and testing conditions of 24-hour desiccator method was critically reviewed, and an improvement of this method was proposed to meet international standards. Two different small chamber methods ($20\ell$ and $1m^3$ chamber methods) were also compared in terms of their advantages and disadvantages. In addition, the regulation levels of formaldehyde emission of wood-based composite panels were compared for different countries. The selection of a reference method of measuring formaldehyde emission of wood panel products should consider the ease of conducting test and cost required. Results should be exchangeable for different methods.
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나노피브릴화 셀룰로오스와 마이크로피브릴화 셀룰로오스의 무용매 아세틸화
박성수 ( Seongsu Park ),박병대 ( Byung-dae Park ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
Nanocellulose has advantages such as hydrophilicity, low density, high strength property and surface area. But, its hydrophilicity become a problem when it contact with polymer matrix in nanocomposites. So, it is necessary to modify hydrophilicity to hydrophobicity through chemical modification. This work focused on the impact of solvent-free acetylation using iodine and sulfuric acids as a catalyst and compared the properties of acetylated cellulose nanofibrils (CNFs) and cellulose microfibrils (CMFs). Various techniques such as attenuated total reflectance infrared (ATR-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and contact angle (CA) measurement were conducted to obtain degree of substitution (DS), crystallinity, thermal stability, and wettability.
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방부제 처리가 폴리우레탄 수지로 접착 된 CLT의 성능에 미치는 영향
김민석 ( Minseok Kim ),박병대 ( Byung-dae Park ),임형석 ( Hyung Seok Lim ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
Interactions between micronized copper azole - type C (MCA-C) treated southern pine and polyurethane (PU) resins for cross laminated timber (CLT) was investigated. The main objective is to study the influence of preservative systems on the performance of CLT. The preservative treatment was determined as a control (untreated), low (slightly-treated) and high (heavily-treated) level. The physical mixture was obtained by mixing PU resins with either untreated or treated wood powder at a mass ratio of 100:1, 100:2 and 100:3 (1, 2 and 3 %). The polymerization and curing behaviors between wood and PU resins were studied using differential scanning calorimetry (DSC). The bond line thickness and depth of resin penetration were also obtained by confocal laser scanning microscopy (CLSM) and field emission scanning electron microcopy (FE-SEM). As a results, the high-treated PU resins showed faster curing behavior than the control PU resins. The bond-line thickness showed the thinnest glue line at the high-treated wood. And, the depth of resin penetration also showed the deepest resin penetration at high-treated wood.
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요소 멜라민 수지 접착제의 GPC 측정변수가 분자량에 미치는 영향
김민정 ( Kim Minjeong ),박병대 ( Byung-dae Park ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
This study was conducted to understand the effect of gel permeation chromatography (GPC) parameters such as flow, column-detector temperature and sample injection temperature on the molecular mass of melamine-urea-formaldehyde (MUF) resins. Two methods were used for the synthesis of MUF resins. MUF-A resins were synthesized by reacting urea and melamine (5, 10 and 20%) and formaldehyde at the same time using the alkaline-acid-alkaline reaction. Meanwhile, MUF-B resins were synthesized by reacting urea with formaldehyde first, and then reacted with melamine. When melamine content increased from 10 to 20%, the molecular weight (MW) decreased slightly in MUF-A resins. In addition, the highest MW was detected at when the flow rate of 0.3 ml/min, the column-detector temperature of 50°C, and the injection temperature of 25°C. By contrast, the MW of MUF-B resins were usually higher than those of the MUF-A resins. When the melamine content increased, the MW increased. Furthermore, when the flow rate was 0.3 ml/min and the column-detector and injection temperature were 50°C, MUF-B resins had the highest MW. These results indicated that MUF-B resins were more branched molecules while MUF-A resins were less branched molecules.
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집성재 제조를 위한 상온경화형 요소 멜라민 수지 접착제의 성능 및 경화제의 조성
김민석 ( Minseok Kim ),박병대 ( Byung-dae Park ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
The synthesis method of cold-setting melamine-urea-formaldehyde (MUF) resin adhesives and composition of the hardener for glue laminated timber (Glulam) were investigated. Cold-setting MUF resins is synthesized in a sequential reaction process in which melamine contents (30, 40 %) and formaldehyde are first reacted, and then urea is reacted. In addition, the hardener for curing the MUF resins at room temperature was formulated using carboxymethyl cellulose (CMC) and formic acid. And, these MUF resins and the curing agent were mixed at a weight ratio of 100 : 15, respectively, and then used to manufacture of Glulam. Block shear strength, wood failure, and delamination tests were done to evaluate the adhesion performance of MUF resins. As a result, MUF resins were satisfied with the requirement of KS standard in block shear strength and wood failure, but only the MUF resins with 40% melamine content was satisfied with the requirement of KS standard in delamination test. Therefore, the cold-setting MUF resins with 40% melamine content could be used in the manufacture of Glulam.
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