• Journal of the Korean Wood Science and Technology
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• 제23권3호
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• pp.33-39
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• 1995

To accelerate the cure of phenolic resin adhesives for plywood, the complexation with melamine resin and the addition of cure-accelerating agents were discussed. The hot-pressing temperature and time of phenol resin could be decreased by complexation with melamine resin. but the wet glue-joints strength of phenol melamine resin was lower than that of ordinary phenol resin in case of plywood using spruce veneer at core layer. Among the tested cure-accelerating agents. the sodium carbonate showed the greatest effect on shortening gelation time of phenolic resin. In addition, in the manufacturing scale test, the hot-pressing time of phenol resin with the addition of 5 parts sodium carbonate could be shortened about 20% compared with ordinary phenol resin which had same glue-joints properties.

• 한국재료학회지
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• 제26권9호
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• pp.472-477
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• 2016

Microstructure evolutions of thermosetting resin coating layers fabricated by electrostatic spray deposition (ESD) at various processing conditions were investigated. Two different typical polymer systems, a thermosetting phenol-formaldehyde resin and a thermoplastic polyvinylpyrrolidone (PVP), were employed for a comparative study. Precursor solutions of the phenol-formaldehyde resin and of the PVP were electro-sprayed on heated silicon substrates. Fundamental differences in the thermomechanical properties of the polymers resulted in distinct ways of microstructure evolution of the electro-sprayed polymer films. For the thermosetting polymer, phenol-formaldehyde resin, vertically aligned micro-rod structures developed when it was deposited by ESD under controlled processing conditions. Through extensive microstructure and thermal analyses, it was found that the vertically aligned micro-rod structures of phenol-formaldehyde resin were formed as a result of the rheological behavior of the thermosetting phenol-formaldehyde resin and the preferential landing phenomenon of the ESD method.

• Bulletin of the Korean Chemical Society
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• 제33권10호
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• pp.3413-3416
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• 2012

Phenol-free resin was synthesized and its printing ink properties were investigated. The phenol-free resin was produced by esterification of poly phthalate and Diels-Alder adduct of rosin anhydride. Compared to rosin modified phenolic resin, eco-friendly phenol-free resin showed better vehicle properties in terms of gloss, yellowing, runability, and storage stability. The results suggest the utility of phenol-free resin instead of conventional rosin modified phenolic resin.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 C
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• pp.965-967
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• 1999

In order to solve to instability in air and to format dentrite, we used carbonized phenol resin electrode which is amorphous carbon. The structure and properties of deeply Li-doped carbonized phenol resin have been investigated in association with their utilization as electrodes in rechargeable batteries. Resol type phenol resin used as starting material. The doped lithium was found neither in metallic nor in ionic states even in the most deeply doped state($C_{2.2}$Li stage). It has also been confirmed that the carbonized phenol resin electrode has a large capacity with good stability and reversibility. These results strongly suggest that the carbonized phenol resin can make an excellent anode material for secondary batteries. Finally, we discuss that the carbonized phenol resin doped up to the $C_2Li$ stage can exhibit an energy density per volume as high as lithium metal. We know that carbonized phenol resin can used as cathode as well as anode by cyclic voltammogram.

• Journal of the Korean Wood Science and Technology
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• 제21권1호
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• pp.51-58
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• 1993

The phenol resorcinol formaldehyde resin (PRF) adhesives which are curing at ambient temperature for structural purposes were synthesized. A PRF resin is produced according to the two-stage reaction system. In first stage, a low-condensed resol or methylolated phenol were prepared from phenol by reaction with a formaldehyde in alkaline condition. The molar ratio of phenol to formaldehyde was 1.0~1.4. And in second-stage, resorcinol was added to combine with the methylol group of a low-condensed resol(R/P molar ratio 0.3). The glue-joint strength, pot-life and workability of this synthetic PRF resin were superior to conventional ambient temperature setting adhesives such as oilic urethane or water based polymer-isocyanate resin for wood adhesives.

• Korean Chemical Engineering Research
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• 제55권2호
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• pp.220-224
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• 2017

본 논문에서는 전기절연판이나 접착제로 널리 사용되는 페놀수지를 초임계 유체를 이용하여 카본입자로 재활용 하는방법을 연구 하였다. 폐페놀수지는 불융/불용 특성으로 대부분 매립하거나 소각처리하고 있으며, 환경오염 방지차원에서 페놀수지의 새로운 재활용 기술 개발이 매우 필요한 실정이다. 폐페놀수지를 재활용하기 위해 다양한 아/초임계 용매(에탄올, 아세톤, 물, 메탄올)를 선정하여 처리하였다. 그 결과 기존의 카본입자의 제조 방법들 보다 훨씬 낮은 온도 조건($350{\sim}380^{\circ}C$)에서 카본입자를 제조할 수 있었다. 본 연구에서는 재활용된 카본입자의 FT-IR, XRD, TGA, SEM, EDS 분석을 통하여 반응용매에 따른 카본입자의 특성을 고찰하였으며, 모든 용매에 대해 동일한 화학구조 및 비정질 구조를 가지는 카본입자를 제조 할 수 있었다.

• Journal of the Korean Wood Science and Technology
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• 제15권1호
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• pp.1-11
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• 1987

소나무 크라프트 펄프제조과정중 회수된 폐액으로 Black liquor-phenol formaldehyde. Methylolated kraft lignin-phenol formaldehyde 및 Lignin cake-phenol rein 세 종류의 접착제가 제조되었다. Black liquor-phenol formaldehyde resin 제조시 Phenol의 약 60%를 크라프트 폐액으로 대치할 수 있다. 본 접착제의 최적압착조건은 $160^{\circ}C$에서 7분간이였다.(상태접착력 : 15.77kg/$cm^2$ 내수접착력 : 8.54kg/$cm^2$). Methylolated kraft lignin-pheno] formaldehyde resin 제조시 Phenol의 약 80~90%를 Methylolated kraft lignin으로 대용할 수 있었다. 본 접착제 제조시 pH를 2.6 용매로서 Methanol, 접착제 1g 당 $0.2m\ell$ Formaldehyde를 첨가하는 것이 접착력이 가장 높았다(상대접착력 : 18.54kg/$cm^2$, 내수 접착력 : 10.08kg/$cm^2$. Lignin cake-phenol ressin에서 Phenol양과 Kraft lignin양이 1 : 1일 경우에 접착력이 높았다. 본 접착제의 최적 압착조건은 $150^{\circ}C$에서 4분간이었다.(상태 접착력 : 18.46kg/$cm^2$, 내수접착력 : 12.3kg/$cm^2$).

• Journal of the Korean Wood Science and Technology
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• 제12권1호
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• pp.38-43
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• 1984

Water soluble urea-melamine-phenol copolymer adhesive manufactured with 80 percent of urea resin contents was manufactured by different molar ratio for a high temperature curing type, and their properties and strengthes were examined through manufactures of plywood with Kapur (Dryobalanops spp.) veneers. The results are summarized as follows: 1. Specific gravities of air dried plywood manufactured from each adhesive ranged from 0.78 to 0.84 and their moisture contents met the KS requirement. 2. In dry and wet shear strength, $U_{80}M_{10}P_{10}$ copolymer resin showed the highest value and urea resin was the lowest, indicating that melamine and phenol were effective for increasing glue shear strength of urea resin. 3. In case of glue shear strength after boiling test, phenolic resin was the nest and melamine was not so effective as phenol on reinforcement of boiling water resistance of urea resin.

• 한국염색가공학회지
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• 제28권4호
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• pp.239-245
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• 2016

In this study, carbon/phenol composites were prepared from carbon fiber preform and phenol resin by RTM(resin transfer molding) process. And changes in the properties of the composite according to the pre-treatment of phenol resin was mainly studied. RTM process conditions were deduced from viscosity and thermal analysis of phenol resin which were rheometer and thermogravimetric analyzer(TGA). RTM process was performed under various injection and molding temperature. Characterization of the prepared C/P composites were evaluated by various analysis. Morphology of composites was analyzed by Micro-CT(MCT), Mechanical properties of composites were measured through the flexural properties. As results, volatile impurities of phenol resin were effectively removed at resin pre-treatment temperature of $100^{\circ}C$ and composite was sufficiently cured at molding temperature of $180^{\circ}C$.

• 한국해양공학회지
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• 제14권4호
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• pp.49-55
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• 2000

This study has been investigated to apply fiber reinforced composites instead of asbestos as a friction material. the reinforced used was E-glass fiber and binder resin was phenol having good mechanical properties and heat resistance. And it has been also investigated the effect of molding conditions and some additives such and carbon black, alumina and rubber powder in E-glass fiber/phenol resin composite on the friction on the friction and wear characteristics. As a result, it was found that the molding conditions of E-glass fiber/phenol resin composites for friction materials had to be different from those of phenol resin and was found that the wear rate of E-glass fiber/phenol resin composites added alumina powder was higher than of composites added carbon black in the same wear distance. And it was found that friction coefficient of E-glass/phenol resin composites added carbon black was decreased and that of the composites added the powder of natural rubber and ABS rubber were increased compared to the composites.