• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.185-188
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• 2002

An abrasive vitreous bonded solid mass having a vitrified abrasive structure comprising diamond grains which are held by an in inorganic bonding agent, the vitrified diamond wheel is impregnated with a composition which comprises a thermosetting synthetic resin and a surfactant. The vitrified diamond wheel is manufactured by preparing the composition including the resin and the surfactant, impregnating the abrasive structure with the composition, and curing the composition. The diamond wheel newly developed showed excellent performance in grinding carbide.

• The monthly packaging world
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• s.363
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• pp.112-115
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• 2023

• Journal of the Korean Wood Science and Technology
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• v.21 no.1
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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.

• Textile Coloration and Finishing
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• v.9 no.4
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• pp.1-6
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• 1997

Water repellent finish was carried out using water repellent agent(AG-480), melamine resin(Sumitex Resin MK), and catalyst(Sumitex Accelerator ACX). PET/nylon fabrics were treated with melamine resin by pad-dry-cure method and subsequently washed and dried. Durable water repellency was controlled by the melamine resin and catalyst. Water repellency was tested by spray rating method and durability of water repellency were measured by launder-O-meter and pilling tester. The optimum conditions of durable water repellent finish for new synthetic fabric were as follows; concentration of water repellent finishing agent 20g/l; concentration of melamine & catalyst 0.5g/l; curing condition $160^{\circ}$ ${\times}$ 30sec. Water repellency after washing and rubbing is improved by melamine resin and catalyst.

• Resources Recycling
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• v.20 no.3
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• pp.68-76
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• 2011

For the separation of aluminum and iron from platinum mixtures, extraction resins were synthesized and separation efficiencies were compared with those by commercial one, $P_{204}$. During synthesis, the suspension polymerization method was adopted with D2EHPA as an extractant. Also, benzoyl peroxide as a starter was divided into 3parts and injected for the uniform size and dispersion of resin particles. Comparison tests resulted in 100% separation of Fe and Pt for both synthetic and $P_{204}$ resins. In case of Al and Pt, synthetic and $P_{204}$ resin gave extraction efficiencies of 99.9% and 98.9%, respectively. Difference in extractant contents of synthetic resin(61.8%) and $P_{204}$(60%) was considered to give differences in separation efficiencies of aluminum and iron elements. For both resins, separation efficiencies of Al and Fe increased up to $55^{\circ}C$. According to FT-IR analyses of both resins, specific peaks of D2EHPA and crosslinked polystyrene were identified at the wavenumber of $1000cm^{-1}$ and $2900cm^{-1}$ respectively.

• Textile Coloration and Finishing
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• v.26 no.3
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• pp.187-194
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• 2014

To improve the deep coloring effect of PET fabrics, the alkali treated and black dyed PET fabrics were treated with 2 kinds of low refractive compounds such as acrylic resin and silicone resin. The color depth effect of treated PET fabrics was evaluated as lightness(L) change by UV-visible spectrophotometer. As the weight loss of PET fiber treated with alkali increased, the color depth of PET fabrics increased. Lightness(L) of PET fabrics treated with deep coloring agent was lower than that of untreated PET fabrics. The optimum concentration of treated PET with deep coloring agent was 4% o.w.s. The deep coloring effect of PET fabrics treated with silicone resin was higher than one treated with acrylic resin. PET fabrics treated with silicone resin only might be more appropriate process than PET fabrics treated with acrylic and silicone resin for giving deep coloring effect for polyester fabrics.

• Journal of the Korean Applied Science and Technology
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• v.13 no.1
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• pp.1-10
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• 1996

We have prepared diamine-benzoquinone polymer which was known to excellent water proofing, high adhesion strength and good anti-corrosive effect, and have investigate with the possibility of application as a high performance resin for coatings. First of all, the reactivity of diamine-benzoquinone has been described an example of polymer reaction with research trend. The polymer reaction was divided into the polymerization with several diamine-benzoquinone and urethane group. The synthetic resin was shown a high solubility. In case of polymer containing urethane, water absorption content, water proofing and mechanical properties were controlled with the content, water proofing and mechanical properties were controlled with the content of quinone. It was shown that an use of choice was a possible result for various coatings. Diamine-quinone polymer can be used as a new resin for coatings. In addition, the polymer containing a functional group was shown a useful applicability as a high performance resin.

• Journal of the Korean Society for Nondestructive Testing
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• v.34 no.2
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• pp.141-147
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• 2014

A nondestructive ultrasonic technique was applied to evaluate the thermal characteristics and degradation of synthetic polymer resin (plastics) with better cost-effectiveness and functionality than glass and metal. Thermoplastic and transparent acrylic resin (PMMA) specimens were annealed at below the glass transition temperature ($T_g$), and the propagation characteristics (attenuation and velocity) were measured. The attenuation increased and the velocity decreased with thermal degradation. The results showed that the thermal aging of the specimens could be evaluated quantitatively and that the Tg could be evaluated qualitatively.

• Resources Recycling
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• v.20 no.6
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• pp.28-36
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• 2011

The adsorption of nickel(Ni) from sulfuric acid solution was carried out by ion exchange method. A series of batch tests in synthetic solutions were carried out using Lewatit Monoplus TP 220 resin. The following experimental parameters, such as temperature, shaking rate, reaction time, pH, resin dosage and concentration of nickel ions etc. were investigated to establish the effective optimum conditions of nickel adsorption. The solution pH(2.0~5.0) and shaking rate had little effects on the adsorption of nickel and adsorption time of 72hours was required to reach equilibrium. The experimental results show a good agreement with Feundlich isotherm and pseudo-second order reaction. The adsorption behavior of Ni obtained from synthetic solution was compared with that of waste electroplating solution. Elution of nickel from loaded resin increased with increase in $H_2SO_4$ concentration.

• Magazine of RCR
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• v.16 no.3
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• pp.45-50
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• 2021