• Title/Summary/Keyword: 왁스코팅

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Curing and Surface Properties of UV-curable Coating Containing Wax (왁스를 함유한 자외선 경화형 코팅제의 경화 및 표면 물성)

  • Han, A-Ram;Kim, Jong-Gu;Hong, Jin-Who;Kim, Hyun-Kyoung
    • Journal of Adhesion and Interface
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    • v.13 no.1
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    • pp.38-44
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    • 2012
  • Surface properties and curing behavior of UV-initiated photopolymerization with and without wax have been investigated by pendulum hardness, pencil hardness, gloss, photo-differential scanning calorimetry (photo-DSC) and SEM. In addition, the influence of wax type (paraffin wax, PE wax) on the various properties of UV cured films was studied. The results showed that the wax type was the significant factor affecting gloss and surface hardness of UV cured films. Specially, the photo-DSC results showed that ${\Delta}H$ for the UV cured films containing paraffin wax was higher than the corresponding values for the formulation without wax and with PE wax. The observed results clearly demonstrate that the photopolymerization of UV curing with paraffin wax in an air atmosphere is less inhibited by the oxygen compared to UV curing without wax and with PE wax.

Convergence Study on the Development and Material Property of Wax for Surface Conservation of Iron Alloy Outdoor Sculpture (야외 철제 조각 작품 표면 보존용 왁스의 개발 및 재료 특성에 관한 융합 연구)

  • Oh, Seung-Jun;Wi, Koang-Chul
    • Journal of the Korea Convergence Society
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    • v.9 no.4
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    • pp.151-160
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    • 2018
  • Waxes currently used as a coating material to preserve surfaces of outdoor iron sculptures tend to face lower coating strength and efflorescence due to the aging from air pollution and acid rains. Consequently, they are subjected to repeated corrosions shortly after the treatment. And the sculptures face the problem losing their original nature because of the changes of colors and lusters, so this convergence study aims at developing wax with better performance than the existing materials. For this reason, the study identified the effects of physical property using the environmental experiments such as the tests of salt spray and gas corrosion as well as the analysis of luster level and thermo-gravimetry. As this study result, the developed ISC wax showed the excellent blocking effect from salt water and coating durability more than five times compared with the existing waxes, better acid resistance by two-four times, sun block effect by 2-10 times, improved luster variance by 3-16 times, improved thermo-stability and durability by 0.5-5 times, and therefore demonstrating far better coating effect than the existing waxes. In the light of these findings, this study contributes for this new development which can replace the existing waxes used so far in order to preserve the outdoor iron sculptures.

A study on properties and synthesis of polyurethane compound formed hard segments by polyether polyol for lamb skin coat (Lamb skin 코팅용 polyether polyol을 이용한 hard segment를 형성하는 polyurethane compound의 합성 및 물성에 관한 연구)

  • Lee, Joo-Youb;Nam, Sang-Sung
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.2
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    • pp.296-304
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    • 2014
  • For this research, prepared polyurethane dispersion of hard segment type and polyethylene emulsion wax. Use these resin, this article has been analyzed about mechanical properties variation by increasing amount of polyethylene emulsion wax on Lam skin leather and dried film. According to measure data for solvent resistance, PUD had good property. As known in the results, increase of polyethylene wax constant did not influence to big variation of hybrid resin properties. As test of tensile strength, PUD had good tensile characteristic($1.235kg_f/mm^2$) and PUD-EW4 had lowest tensile characteristic($1.022kg_f/mm^2$). As same as tensile characteristic, abrasion test determined PUD(52.225 mg.loss) had highest properties. In elongation case, PUD showed 698 % modulus which was best properties in this experiment.

Effect of Functional Packing Materials on the Maintenance of Freshness of Cut Lily and Cut Rose (기능성 포장재가 백합과 장미의 선도유지에 미치는 효과)

  • Suh, Jeung Keun;Kim, Ji Hee
    • FLOWER RESEARCH JOURNAL
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    • v.18 no.1
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    • pp.57-61
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    • 2010
  • This study was carried out to evaluate the effect of functional packing materials on vase life and quality of Lilium Oriental hybrid 'Le Reve' and Rosa hybrida 'Fire King'. Lily and rose were stored at $5^{\circ}C$ and $20^{\circ}C$ for two days after packing of 25% calcium or 36% wax coated package. When Lilium Oriental hybrid 'Le Reve' was stored in $5^{\circ}C$ after packing of 36% wax coated package, vase life and maintenance of freshness were improved by two days. But when Rosa hybrida 'Fire King' was stored in $5^{\circ}C$ or $20^{\circ}C$after packing of 25% calcium or 36% wax coated package, vase life and maintenance of freshness were not as effective as Lily. In our opinion, functional package seems useful in the storage of cut lily.

Study on the Effect of Corrosion Gas and Acidic Falling Materials for Conservational Wax on the Copper based Sculpture (동(銅)이 주종을 이루는 조형물 보존용 왁스의 산성강하물 및 부식 가스에서의 영향성 연구)

  • Oh, Seung-Jun;Wi, Koang-Chul
    • Journal of Conservation Science
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    • v.26 no.4
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    • pp.437-443
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    • 2010
  • The influence of noxious corrosive gas, which is the product of fossil fuel, and the acidic descent material, which becomes the reason for such reaction, on wax which protects the cultural assets, and the habitat factor were researched. It could be viewed that corrosion occurred rapidly due to the acidic descent material, which have the long staying on the material, rather than harmful corrosive gas. Also, it could be figured out that such corrosion began from whitening phenomenon of coated wax. As the acidity increased, more whitening phenomenon occurred, and eventually, it could be found out that whitening effect began due to the acidic descent material, corrosive gas and various 0.1 M acid solution, which lead to the exposure of internal metal, and corrosion occurred. The wax with the greatest resistance to the acidity due to its least changing aspect seemed to be Renaissance wax, except sulfuric acid.

A Study on Preventing Cracks at the Small Hole Exit in Ultrasonic Machining Using a Wax Coating (초음파 미세구멍 관통가공에서 왁스 코팅을 이용한 출구크랙 방지에 관한 연구)

  • Li, Hang;Ko, Tae Jo;Baek, Dae Kyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.3
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    • pp.105-111
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    • 2015
  • Ultrasonic machining (USM) does not involve heating or any electrochemical effects, and subsequently causes low surface damage, has small residual stress, and does not rely on the conductivity of the workpiece. These characteristics are suitable for the machining of brittle materials, such as glass or ceramics. However, USM for brittle materials generates cracks on the workpiece while machining, especially at the hole exit with a small diameter. In this study, wax coating was used to deposit wax on the back side of the workpiece to decrease the occurrence of cracks at the exit holes in USM, and it was finally removed with a cleaning process. The experimental results show that this technique is beneficial for restricting the occurrence of cracks in glass or ceramics.

Development of Post-process for Improving the Surface Roughness of Stereolithography parts - Using Wax Coating and Grinding Post-process - (RP part 표면정도 향상을 위한 후처리 공정 개발 -왁스 코팅과 연삭 후처리 공정 이용-)

  • 안대건;김호찬;최홍태;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.659-662
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    • 2002
  • SL(Stereolithography) part is made by piling up thin layers which causes the stair stepping effect at the surface of SL parts. This effect brings about excessive surface roughness and requires additional post-process finishing such as abrasive techniques that are detrimental to part geometry and time consuming. Hence a wax coating and grinding post-process is proposed to improve the surface quality of SL part. The wax that has suitable properties for the proposed post-process is coated all over the part surface. By grinding the thin layer of coated on the SL part only, the surface roughness can be improved without any damage on the part. From the experimental results, This approach is considered to be very practical fur die casting with RT(Rapid Tooling) techniques.

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Solidify Properties of Radioactive Waste using Paraffin Wax (파라핀 왁스를 이용한 방사성 폐기물의 고화 특성)

  • Lee, Han Chul;Chang, Yoon Ho
    • Applied Chemistry for Engineering
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    • v.17 no.4
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    • pp.391-396
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    • 2006
  • When radioactive wastewater was solidified treatment by cement, the drying rate of cement and the volume reduction ratio was decreased because of boric acid component in the wastewater. In order to supplement the demerit, effects of paraffin wax investigated in this study. Paraffin wax has a hydrophobic properties and a low affinity with inorganic materials. When the radioactive wastewater was tested by a small of wax, the compressive strength of solidified waste are decreased Therefore boric acid in radioactive wastewater are first treated by alkali salt and coated by the stearic acid. During the solidification step, The amount of paraffin wax addition get the result that the compressive strength of solidification with cement was the same as that with paraffin wax. The leaching properties of radioactive waste solidified was the same CFL (cumulative fraction leached), PR (penetration rate), effective diffusivity if paraffin wax content in solidified waste was 20% or 25%.

Study on the Analytical Method and Monitoring of the Oxidized Polyethylene Wax in Foods (식품 중 oxidized polyethylene wax 분석법 연구 및 함유량 실태 조사)

  • Choi, Seung-Hyun;Kim, Jae-Min;Choi, Sun-il;Jung, Tae-Dong;Cho, Bong-Yeon;Lee, Jin-Ha;Lee, Gunyoung;Lim, Ho Soo;Yun, Sang Soon;Lee, Ok-Hwan
    • Journal of Food Hygiene and Safety
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    • v.32 no.4
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    • pp.284-289
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    • 2017
  • Oxidized polyethylene wax (OPEW) is, one of the food additives, used as a coating agent in citrus fruits and nuts. OPEW is authorized to quantum satis in EU, USA, and is acceptable less than 250 mg/kg in Australia and New Zealand. But OPEW is unauthorized as a food additive in Korea. This study was to establish the analytical method of OPEW and demonstrate the effective application of various food samples. We first conducted to compare the various analytical method including acid value (AV), high temperature gel permeation chromatography (HT-GPC), matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF/MS), gas chromatography flame ionization detector (GC-FID) and fourier transform infrared spectroscopy (FT-IR). This result indicated that FT-IR spectrum of OPEW treated food sample displayed absorption bands for carbonyl group (C=O, $1714cm^{-1}$), ester group (C-O, $1463cm^{-1}$), aliphatic group (C-H, $2916cm^{-1}$). Furthermore, IR spectrum of OPEW treated food sample showed similar tendency with IR spectrum of OPEW standard. Therefore, it is confirmed that analytical method using FT-IR can be detected on analysis of OPEW in food. As a result of monitoring of 111 samples using established analytical method, OPEW was not detected in the food samples.