• 제목/요약/키워드: Ultraviolet (UV) curing

검색결과 35건 처리시간 0.035초

Preparation of UV protective cotton fabrics by novel UV-curing technique - Using a photocrosslinkable polymer, poly(ethylene glycol) dimethacylate -

  • Kim, Sin-Hee
    • 패션비즈니스
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    • 제11권6호
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    • pp.52-61
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    • 2007
  • To increase the ultraviolet radiation (UVR) protection of cotton fabric, ultraviolet protection (UVP) materials were treated onto cotton fabric using a new technique, UV-curing. A photocrosslinkablepolymer, poly(ethylene glycol) dimethacrylate was used as a UV-curable resin in the presence of a small amount of photoinitiator. Two kinds of UVP materials were used, UV-absorber, 2,2'-dihydroxy-4-methoxy benzophenone, and UV-scatterer, $TiO_2/ZnO$ Pad-dry-cure method in employing these materials onto cotton was also conducted to compare the effectiveness and the washfastness of UVP treatment between curing methods. UVP treated cotton fabric showed a moderate increase in UVP in case of 2,2'-dihydroxy-4-methoxy benzophenone treatment and a high increase in case of $TiO_2/ZnO$. UV-curing method increased the washfastness of UVP property of $TiO_2/ZnO$ treated cotton fabrics. However, in case of 2,2'-dihydroxy-4-methoxy benzophenone, similar wash fastnesses of UV-cured and pad-dry-cured cotton were observed. It can be presumed that 2,2'-dihydroxy-4-methoxy benzophenone was not significantly affected by water since its hydrophobicity. In short, UV-curing of UVP materials onto cotton was successfully done, and treated cotton fabrics showed the increased UVP properties and an increased washfastness in some extent.

Electro-Micromechanical 시험법을 이용한 탄소섬유 강화 Epoxyacrylate 복합재료의 UV 및 열경화에 따른 비파괴적 손상 감지능 및 경화 Monitoring (Nondestructive Damage Sensing and Cure Monitoring of Carbon Fiber/Epoxyacrylate Composite with UV and Thermal Curing using Electro-Micromechanical Technique)

  • Kong, Jin-Woo;Kim, Dae-Sik;Park, Joung-Man;Lee, Jae-Rock
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2002년도 추계학술발표대회 논문집
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    • pp.261-264
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    • 2002
  • Interfacial evaluation, damage sensing and cure monitoring of single carbon fiber/thermosetting composite with different curing processes was investigated using electro-micromechanical test. After curing, residual stress was monitored by measurement of electrical resistance (ER) and then it was compared to correlate with various curing processes. In thermal curing, curing shrinkage appeared significantly by matrix shrinkage and residual stress due to the difference in thermal expansion coefficient (TEC). The change in electrical resistance (ΔR) on thermal curing was higher than that on ultraviolet (UV) curing. For thermal curing, apparent modulus was the highest and reaching time until same strain was faster. So far thermal curing shows strong durability on the IFSS after boiling test.

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Electro-Micromechanical 시험법을 이용한 탄소 섬유 강화 에폭시아크릴레이트 복합재료의 자외선과 열경화에 따른 경화 모니터링 및 비파괴적 계면 평가 (Nondestructive Interfacial Evaluation and Cure Monitoring of Carbon Fiber/Epoxyacrylate Composite with UV and Thermal Curing Using Electro-Micromechanical Technique)

  • 박종만;공진우;김대식;이재락
    • 폴리머
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    • 제27권3호
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    • pp.189-194
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    • 2003
  • Electro-micromechanical 시험법을 이용하여 탄소 섬유 강화 열경화성 수지 복합재료의 경화 방법에 따른 계면 평가와 손상 감지능 및 경화 모니터링에 대해 고찰하였다. 경화 후 잔류 응력은 전기 저항 측정을 통해 모니터링 하였으며, 경화 방법에 따라 상호 비교하였다. 기지 재료의 인장 강도, 탄성률 및 계면 전단 강도는 열 경화의 경우가 자외선 경화보다 더 크게 나타났으며, 열 경화에서 경화 수축은 열팽창 계수 차이에 의한 잔류 응력 및 기지 재료의 수축에 의해 자외선 경화와 비교하여 더 크게 나타났다. 열 경화 시의 경화 중 전기 저항은 자외선 경화보다 더 큰 범위에서 변하였으며, 기지 재료의 기계적 물성과 계면 접착력에 의해 다르게 나타나는 겉보기 탄성률 또한 더 컸고, 같은 응력까지 더 빠르게 도달하였다.

망점 형태에 따른 망점 특성에 관한 연구 (A Study of Dot Characteristics in Dot Patterns)

  • 차재영
    • 한국인쇄학회지
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    • 제15권2호
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    • pp.107-115
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    • 1997
  • The ultraviolet(UV)-curable materials are widely used in inks and coatings. In this paper is designed to develop materials having flexibility and functionality with UV-curable acrylate monomer and alkyd resin. At first, phase diagram is prepared for miscibility of UV -curable acrylate monomer with alkyd resin. Also the gel fraction and dynamic viscosity are measured to curing speed of mixing system. In results, it has been demonstrated that miscibility and curing speed are greatly influenced by alkyd resin content.

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In-mold Decoration 포일에 사용되는 경질 코팅 수지의 전자빔 경화 (Electron Beam Curing of Hard Coating Resin for In-mold Decoration Foils)

  • 심현석;윤덕우;김건석;이광희;이병철
    • 폴리머
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    • 제35권2호
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    • pp.141-145
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    • 2011
  • In-mold decoration 포일의 경질 코팅 층에 사용하는 수지를 대상으로 전자빔(electron beam, EB) 경화에 관한 연구를 수행하였다. 시료에 다른 양의 EB를 조사하고 경화 반응 정도를 Fourier transform infrared(FTIR) spectroscopy를 사용하여 관찰하였다. EB 조사선량 증가에 따른 코팅 물성의 변화를 표면 경도와 내마모성을 중심으로 알아보았다. 또한 나노 입자 첨가가 코팅 물성에 미치는 영향을 조사하였다. 본 연구로부터 얻은 실험적 결과는 자외선(ultraviolet, UV) 경화 시스템과 유사한 EB 경화 시스템의 상업적 개발에 이용될 수 있을 것으로 기대된다.

치과 3D 프린팅용 자외선 경화 레진에 광원의 두 가지 파장에 따른 경화 및 항온수조 침적에 따른 변형률의 비교 분석 (Comparative analysis of strain according to two wavelengths of light source and constant temperature bath deposition in ultraviolet-curing resin for dental three-dimensional printing)

  • 김동연;이광영;강후원;양천승
    • 대한치과기공학회지
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    • 제42권3호
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    • pp.208-212
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    • 2020
  • Purpose: This study aimed to analyze the shrinkage and expansion strain of ultraviolet (UV)-cured resin according to the wavelength of the light source and compare the shrinkage and expansion. Methods: We prepared the mold with according to the ISO 4049 specimen. The size of the circle in the mold was prepared with a height of 6.02 mm and a diameter of 4 mm. UV-curable resin for three-dimensional (3D) printing was injected into the circular mold. The control group was irradiated with a wavelength of 400~405 nm using UV-curing equipment (400 group), and the experimental group was irradiated with a wavelength of 460~465 nm (460 group). Both groups were produced ten specimens. The produced specimen was first measured with a digital micrometer. After the first measurement, the specimen was immersed in a constant temperature water bath for 15 days, after which the second measurement was performed, and the third measurement was taken after 30 days. The measured values were analyzed using the independent sample t-test (α=0.05). Results: In the non-immersion water tank, the contraction was 0.9% in the 400 group and 1.3% in the 460 group. In the constant temperature bath, the expansion was high at -0.4% in the 400 group for 15 days, and the smallest expansion was -0.03% for the 400 group for 30 days. There were significant differences between the two groups (p<0.05). Conclusion: The 400 group had a lower UV resin specimen strain than the 460 group. Therefore, it is recommended to use the wavelength required by the UV-curing resin.

Gamma radiation shielding properties of poly (methyl methacrylate) / Bi2O3 composites

  • Cao, Da;Yang, Ge;Bourham, Mohamed;Moneghan, Dan
    • Nuclear Engineering and Technology
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    • 제52권11호
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    • pp.2613-2619
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    • 2020
  • This work investigated the gamma-ray shielding performance, and the physical and mechanical properties of poly (methyl methacrylate) (PMMA) composites embedded with 0-44.0 wt% bismuth trioxide (Bi2O3) fabricated by the fast ultraviolet (UV) curing method. The results showed that the addition of Bi2O3 had significantly improved the gamma shielding ability of PMMA composites. Mass attenuation coefficient and half-value layer were examined using five gamma sources (Cs-137, Ba-133, Cd-109, Co-57, and Co-60). The high loading of Bi2O3 in the PMMA samples improved the micro-hardness to nearly seven times that of the pure PMMA. With these enhancements, it was demonstrated that PMMA/Bi2O3 composites are promising gamma shielding materials. Furthermore, the fast UV curing exerts its great potential in significantly shortening the production cycle of shielding material to enable rapid manufacturing.

약한 광중합과 열경화를 이용한 곡면 미세 표면주름 제작 (Fabrication of Microscale Wrinkles on a Curved Surface Using Weak-Polymerization and Thermal Curing Process)

  • 양정호;조지준;박상후
    • 한국정밀공학회지
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    • 제33권10호
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    • pp.875-880
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    • 2016
  • In this study, we proposed an effective and simple way to directly generate wrinkle patterns on a curved surface. A curved surface was prepared using a 3D printer and an UV (Ultraviolet)-lighting system was utilized to weakly polymerize the UV-curable thin resin layer coated on the surface, resulting in a gradient of material properties in the layer thickness. Subsequently, a thermal curing process was conducted to generate microscale wrinkles by compressive forces that were generated during complete curing. Wrinkle shapes from 5, 15, 25 sec of UV-light exposure were compared. With increasing UV-exposure, the line-width of wrinkles became thicker due to much higher strength of skin zone. The results indicated that the proposed fabrication process could be utilized for surface modification in diverse research fields.

레진의 경화 반응을 고려한 UV-NIL공정의 열특성에 관한 실험 및 수치해석 연구 (Experiment and Numerical Study on Thermal Characteristics of UV-NIL Process Considering the Cure Kinetics of Photo-polymer)

  • 김우송;박경서;남진현;임흥재;장시열;이기성;정재일;임시형;신동훈
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.1847-1850
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    • 2008
  • The process conditions during ultraviolet nanoimprint lithography (UV-NIL) process such as temperature, stamping pressure, UV irradiation, etc. are effective factors for successful imprinting of complex and fine patterns. In this study, the effects of aluminum mold on the thermal characteristics of UV-NIL process were investigated through imprinting experiments and numerical simulations. The temperature of polymer resin on mold was measured to study thermal characteristics during UV curing. From the experimental and numerical results, the importance of curing reaction control for UV-NIL process was discussed for deformation characteristics.

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