• 제목/요약/키워드: UV-curing

검색결과 283건 처리시간 0.026초

UV-curing Behaviors and Mechanical Properties of UV-cured Polylactic Acid (PLA)

  • Lee, Seung-Woo;Park, Ji-Won;Park, Cho-Hee;Kim, Hyun-Joong;Eom, Young-Geun
    • Journal of the Korean Wood Science and Technology
    • /
    • 제41권2호
    • /
    • pp.134-140
    • /
    • 2013
  • UV curing was introduced via a chemical treatment by adding small amounts of a hexafunctional acrylic monomer and a photoinitiator to improve the mechanical properties of PLA. This study also employed a semi-interpenetrated structured polymer network through the process of UV-curing. The UV curing behaviors were investigated using FTIR-ATR spectroscopy and gel fraction determination. Also, the tensile strength was investigated with different hexafunctional acrylic monomer contents and UV doses. The results showed that the crosslinking of UV-induced chemically treated PLA started at a low content of hexafunctional acrylic monomer, resulting in a significant improvement of the mechanical properties compared to those of neat PLA due to crosslinking.

Temporary Bonding and Debonding 공정용 UV 경화형 접착 소재의 코팅 두께에 따른 물성 및 경화거동 (Properties and Curing Behaviors of UV Curable Adhesives with Different Coating Thickness in Temporary Bonding and Debonding Process)

  • 이승우;이태형;박지원;박초희;김현중
    • 한국정밀공학회지
    • /
    • 제31권10호
    • /
    • pp.873-879
    • /
    • 2014
  • UV curable adhesives with different acrylic functionalities were synthesized for temporary bonding and debonding process in 3D multi-chip packaging process. The aim is to study various factors which have an influence on UV curing. The properties and curing behaviors were investigated by gel fraction, peel strength, probe tack, and shear adhesion failure temperature. The results show that the properties and curing behaviors are dependent on not only acrylic functionalities of binders but also UV doses and coating thickness.

다중 집광성 UV-LED 경화형 코팅의 경화특성에 관한 연구 (A study on the curing characteristics of multi-concentrating UV-LED Curable Coating)

  • 정찬권;김범수;박대희
    • 한국산학기술학회논문지
    • /
    • 제19권10호
    • /
    • pp.339-345
    • /
    • 2018
  • 본 논문은 기존의 단일 파장의 UV(Ultraviolet: 자외선)-LED(Light-Emitting Diode) 경화형 코팅 방법과 달리 UV 파장에서 동작되는 LED를 중첩한 다중 집광성 UV-LED 경화형 코팅의 경화 특성에 대해 연구하였다. 각각 365nm, 395nm, 420nm, 450nm 단일 파장의 UV-LED 광원을 선정하여 광원의 광속, 지향각 등 광 특성을 분석하였으며, 또한 UV-LED 광원의 파장별 경화 특성에 대해 분석을 통하여 복합 파장에 대한 LED를 최적화를 진행하였다. 다파장 UV 광원이 중첩되었을 경우 경화 성능 상태를 전산모의 실험을 통해 예측하였으며 실제 설계 및 제작을 하였다. 내부 고속경화도 향상을 위해 각각의 LED를 집광시켜 동일한 위치에서 다파장이 합성, 집광되는 multi-spot 방식 모듈을 제작하여 파장 조합 조건을 달리하여 경화제의 접착력 및 표면, 내부 경화도를 실험하였다. 경도계와 FT-IR 분석 장비를 이용하여 표면 경화와 내부 경화 상태를 비교 분석하였다. 그 결과, 단일 파장보다 UV-LED 4파장을 중첩한 multi-spot방식이 표면 및 내부 경화도의 특성이 높아짐을 확인할 수 있었다.

플라스틱용 자외선경화형 도료의 물성연구 (Physical Properties of UV curable coating on plastic)

  • 김일재;문명준
    • 한국인쇄학회지
    • /
    • 제16권3호
    • /
    • pp.61-80
    • /
    • 1998
  • To investigate in influence of photosensitizer used with benzophenone(BP) in the curing rate and physical properties of UV curable hard coating on plastic, we prepared UV curable clear and pigmented coatings with DEA, DMA, NPM and TEA as photosensitizer, respectively. The curing rate calculated from the decrease of the absorbance of acrylic double bond measured by FT-IR spectroscopy increased s follows; DEA>DMA>NPM>TEA. this order could be explained by the reactivity of diethylamino group of DEA and the ease of formation of activated complex between BP and photosensitizer during the curing process. In UV curable pigmented coatings, the order of curing rate increased as follows; DEA>DMA>TEA>NPM. It was found that the curing rate of the pigmented coating can be increased by light scattering of TiO$_2$. The hardness of coating film cured by photosensitization of DEA and DMA is higher than other photosensitizers due to the crosslinking reaction of DEA and DMA radical bound to polymer backbone.

  • PDF

Durable Press Finish of Cotton via Dual Curing Using UV Light and Heat

  • Jang, Jinho;Yoon, Ki-Cheol;Ko, Sohk-Won
    • Fibers and Polymers
    • /
    • 제2권4호
    • /
    • pp.184-189
    • /
    • 2001
  • Continuous photografting/crosslinking of polyethyleneglycol dimethacrylate oligomers onto cotton using a water-soluble benzophenone photoinitiator was investigated. Photografting increased with increasing irradiation dose, oligomer concentration and photoinitiator concentration. Maximum grafting efficiency of DM 400 and 600 were 83% and 79%, respectively. the photografting increased the wrinkle resistance of cotton implying surface crosslinking of cotton. bothsurface crosslinking and bulk crosslinking of cotton were accomplished via dual curing of a mixed formulation containing both a thermally curable component (BTCCA/SHP) and a UV-curable component. The wrinkle resistance of the crosslinked cotton was found to be higher when cured by thermal curing due to the facile post-polymerization of the UV active component. The presence of crosslinks in the dually crosslinked cotton was verified with FT-IR and thermogravimetric analysis.

  • PDF

전기적 특성을 이용한 UV 경화 프로세스에 대한 새로운 평가방법(II) (A new evaluation method of UV curing process by using electrical properties(II))

  • 이문학;김성빈;이태훈;류정이;김태훈;손세모
    • 한국인쇄학회지
    • /
    • 제22권1호
    • /
    • pp.39-52
    • /
    • 2004
  • A novel evaluation method is investigated for measuring the ability of acid amplification of acid amplifier. The method is based on the measurement of conductivity change by the acid generation according to UV radiation. It is found that the decrease of conductivity is caused by photopolymerization of epoxy monomer during UV curing process of ink film and the by the rate of UV curing. In this paper, the novel acid amplifiers were synthesized and measured thermal stability by means of DSC. It was found that mono-type acid amplifiers were more stable than di-type. It is possible to make the dynamical evaluation the curing rate of UV curable ink in curing process by this method.

  • PDF

무용제 타입 UV경화형 실버 페이스트 개발 (Development of Solvent-Free Type for UV-Curable Silver Paste)

  • 장민용;남현진;남수용
    • 마이크로전자및패키징학회지
    • /
    • 제29권2호
    • /
    • pp.107-112
    • /
    • 2022
  • 본 연구에서는 용제를 전혀 사용하지않고 UV경화가 가능한 실버 페이스트를 개발하였다. 무용제(solvent-free) 타입으로 개발한 실버 페이스트의 점도 및 점탄성 측정하였다. 그리고 스크린인쇄로 패턴을 인쇄한 후에 UV경화로 전극도막을 형성시켰다. 형성된 전극도막의 전도성, 연필경도, 접착력에 대해서 평가하였다. 마지막으로 전극도막의 경화특성은 TGA 및 FT-IR로 평가하였다. 이러한 결과를 정리하면 전도성, 접착력, 경화특성에 대해서는 Paste(4), 즉 1.2 ㎛의 구형 실버 파우더와 50 nm 실버 파우더를 72:8%로 혼합한 실버 페이스트가 가장 우수한 물성이 얻어짐을 알 수 있었다.

UV 경화 수지의 화학적 기계적 경화특성 분석 (Analysis of Chemical and Mechanical Properties of UV Curing Resin)

  • 장용수;김정근;고선호;곽이구
    • 한국기계가공학회지
    • /
    • 제19권6호
    • /
    • pp.88-95
    • /
    • 2020
  • Currently, Fiber-Reinforced Plastic (FRP) composite materials are used in many industrial fields, owing to their superior stiffness and specific strength compared to metals. However, there are issues with FRP inefficiency, due to low productivity of such materials, environmental problems they pose and long curing times needed. Trying to address these issues, research was conducted towards the development of a FRP composite material with excellent properties and short production time, introducing a curing method using a UV lamp. Four types of composite materials were prepared, cured with catalyst or UV (CZ: Catalyst + ZNT 6345, CR: Catalyst + RF 1001 MV, UVZ: Photoinitiator + ZNT 6345, and UVR: Photoinitiator + RF 1001 MV). Examination of the chemical and mechanical properties of these composites showed that UV-cured materials performed better than the catalyst-cured ones. These results indicate that the production process of FRP composite materials can be simplified by using a UV lamp for curing, resulting in composite materials with the same quality, but reduced production time by about 70% compared to currently used practices. This advancement will contribute greatly to the composite material industry.

자외선 경화에 의한 PET 니트직물의 편면 발수발유 가공 (Preferential face coating of knitted PET fabrics via UV curing for water- and oil-repellent finish)

  • 정용균;정영진;장진호
    • 한국염색가공학회지
    • /
    • 제17권6호
    • /
    • pp.27-35
    • /
    • 2005
  • Conventional pad- dry-cure(thermo-fixation) process usually produces functional performance on both sides of a fabric. UV curing technique was applied to impart water- and oil-repellent finish effective only on the face of a PET knitted fabric. The preferential one-side coating, by virtue of the limited penetration of UV light, was achieved by W curing after padding of a fluorocarbon agent without special coating or printing equipments. The difference in the functional property of face and back sides was examined by measuring water and oil repellency at each side of the treated fabric. The influence of pre/post-irradiation dose and agent concentration on the performance of the finished fabrics were investigated. While increase in both resin concentration and post-irradiation did not have significant effect on the finish, UV pre-irradiation of PET fabrics caused remarkable influence presumably due to appropriate surface modification of PET fabrics required for facile wetting of the resin. The dimensional stability and color change of the UV cured fabrics measured by FAST and reflectance spectrophotometry showed significantly decreased color difference and increased percent extension compared with the samples pre-irradiated without agent application.

DLP 공정을 이용한 정밀 치아모델 제작에서 UV 조사량과 후경화 수축률의 상관관계 분석 (Correlation between UV-dose and Shrinkage amounts of Post-curing Process for Precise Fabrication of Dental Model using DLP 3D Printer)

  • 신동훈;박영민;박상후
    • 한국기계가공학회지
    • /
    • 제17권2호
    • /
    • pp.47-53
    • /
    • 2018
  • Nowadays, additive manufacturing (AM) technology is a promising process to fabricate complex shaped devices applied in medical and dental services. Among the AM processes, a DLP (digital light processing) type 3D printing process has some advantages, such as high precision, relatively low cost, etc. In this work, we propose a simple method to fabricate precise dental models using a DLP 3D printer. After 3D printing, a part is commonly post-cured using secondary UV-curing equipment for complete polymerization. However, some shrinkage occurs during the post-curing process, so we adaptively control the UV-exposure time on each layer for over- or under-curing to change the local shape-size of a part in the DLP process. From the results, the shrinkage amounts in the post-curing process vary due to the UV-dose in 3D printing. We believe that the proposed method can be utilized to fabricate dental models precisely, even with a change of the 3D CAD model.