The Influence of Reactive Diluents on the Properties of UV Dual Cured Polyurethane-Modified Epoxy Monoacrylates Films

2013 ◽  
Vol 477-478 ◽  
pp. 1169-1174 ◽  
Author(s):  
Hong Bo Liu ◽  
Wu Ying Zhang ◽  
Feng Lin ◽  
Ning Qing ◽  
Ling Xu
Keyword(s):  
Epoxy Group ◽  
Degree Of Polymerization ◽  
Volume Shrinkage ◽  
Uv Curable ◽  
Excellent Thermal Stability ◽  
Gel Content ◽  
Maximum Value ◽  
Reactive Diluents ◽  
Dual Curing ◽  
Modified Epoxy

The UV-curable liquid compositions were developed with different oligomers (epoxy diacrylates, EDA; epoxy monoacrylates, EMA; or polyurethane-modified epoxy monoacrylates, PMEMA), reactive diluents and photoinitiators. Thin films were prepared by curing these mixtures using a high pressure mercury lamp. The change of absorption peaks of double bond and epoxy group were identified by Fourier Transform Infrared (FTIR) spectra during UV dual curing process. Gel content, mechanical, volume shrinkage and thermal characterizations of the UV-cured films were investigated. The gel content, youngs modulus and stress at break turned to maximum values as the degree of polymerization achieved the maximum value, except for the strain at break. The flexibility of UV dual cured films using PMEMA as oligomer was improved due to grafting of the soft chain segments (polyurethane). The volume shrinkage test indicated that the UV dual cured films exhibited lower internal stress and higher cohesive force than simple radical UV cured films. The thermogravimetric analysis of UV cured films revealed that UV dual cured films prepared from PMEMA showed excellent thermal stability.

Syntheses of allyl phenyl acrylates and their evaluation as reactive diluents in UV-curable coating compositions

1993 ◽  
Vol 21 (4) ◽  
pp. 339-352 ◽  
Author(s):  
J.N.Rupa Vani ◽  
V.Vijaya Lakshmi ◽  
B.S. Sitaramam ◽  
N. Krishnamurti
Keyword(s):  
Uv Curable ◽  
Reactive Diluents

Preparation of novel UV-curable methacrylated urethane resins from a modified epoxy resin and isocyanatoethylmethacrylate (IEM)

2002 ◽  
Vol 47 (5) ◽  
pp. 437-444 ◽  
Author(s):  
Tülay Yılmaz İnan ◽  
Ekrem Ekinci ◽  
Abdülkadir Kuyulu ◽  
Attila Güngör
Keyword(s):  
Epoxy Resin ◽  
Uv Curable ◽  
Modified Epoxy

Eco-friendly castor oil-based UV-curable urethane acrylate zinc oxide nanocomposites: Synthesis and viscoelastic behavior

2019 ◽  
Vol 54 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Abbas Madhi ◽  
Behzad S Hadavand
Keyword(s):  
Zinc Oxide ◽  
Castor Oil ◽  
Zinc Oxide Nanoparticles ◽  
Viscoelastic Behavior ◽  
Environmentally Friendly ◽  
Urethane Acrylate ◽  
Nano Zno ◽  
Uv Curable ◽  
Maximum Value

Attention to environmental problems and the importance of maintaining it have caused the researchers to pay more attention in this regard. The production of polymers and resins has increased in recent years and has affected by environmental pollution due to their long-term degradation. An appropriate solution to this problem is the synthesis of degradable and environmentally friendly polymers and resins. Using natural materials in the synthesis of polymers and resins can help them to be environmentally friendly. The purpose of this research is to synthesize urethane acrylate resins using natural resources. For this purpose, the urethane acrylate pre-polymer was synthesized with castor oil. Then, using modified zinc oxide nanoparticles with 1, 3 and 5 wt% urethane acrylate zinc oxide nanocomposites were produced. The use of castor oil as a degradable part and lack of organic solvent in radiation systems led to the creation of an environmentally friendly resin. Subsequently, the viscoelastic behavior of the prepared nanocomposite was evaluated. Spectrometry results confirm the synthesized resin structure. The morphology of nanocomposites confirmed the proper particle size distribution in a 3 wt.% sample. The results of the dynamic mechanical thermal analysis test showed that increasing the amount of modified nano ZnO could increase the glass transition temperature, and the maximum value was observed in 5 wt.% modified nano ZnO (69.7℃).

Curing behaviour and mechanical properties of pigmented UV-curable epoxy acrylate coatings

2014 ◽  
Vol 43 (4) ◽  
pp. 177-184 ◽  
Author(s):  
Pooneh Kardar ◽  
Morteza Ebrahimi ◽  
Saeed Bastani
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Chemical Structure ◽  
Epoxy Acrylate ◽  
Acrylate Monomer ◽  
Uv Curable ◽  
Content Type ◽  
Reactive Diluents ◽  
Acrylate Monomers ◽  
And Storage

Purpose – The purpose of this work was to study the effect of chemical structure of reactive diluents on the curing behaviour and physical–mechanical properties of a titanium dioxide pigmented UV-curable epoxy acrylate system. Design/methodology/approach – Two different tri-functional and two different tetra-functional acrylate monomers were used as reactive diluents in the formulations. The curing behaviour of the formulations was studied by using photo-differential scanning calorimetry analysis. The rate of curing, conversion at the maximum rate and ultimate conversion for different formulations were calculated. In addition, the physical and mechanical characteristics of the cured films, including glass transition temperature and modulus, were measured by using a dynamic mechanical analysis technique. Findings – The results showed that the ultimate conversion for non-pigmented pentaerythritol triacrylate (PETA) and trimethylol propane triacrylate (TMPTA) formulations were almost similar, but the interference effect of titanium dioxide particles on the curing of the PETA formulations was found to be more considerable in comparison to the TMPTA formulations. The extent of reaction for tetra-functional acrylate monomers was considerably less than those for tri-functional acrylate monomers. The Tg and storage modulus of non-pigmented PETA, TMPTA and pentaerythritol tetraacrylate (PE4TA) formulations were almost the same and higher than that for ditrimethylol propane tetraacrylate (DiTMP4TA) formulations. However, Tg and storage modulus of pigmented tetra-functional acrylate monomer formulations were higher than those for tri-acrylate monomer formulations. Research limitations/implications – The curing conditions (temperature and UV intensity) can affect the network formation and consequently will affect on the properties of the cured films. Practical implications – The pigmented UV-curable coatings are interested for many industries such as wood and automotive industries. The reported data can be used by the formulators working in the R&D departments. In addition, the results obtained can be used by the researchers who are active in the field of structure–property relationship for UV-curable coatings. Social implications – UV-curing systems are considered as one of the most environment-friendly coatings system. Therefore, the developing of its knowledge can help to extend its usage to different applications. Originality/value – The photopolymerisation of pigmented coatings is a great challenge and is hardly investigated in the literature. Therefore, in this research, the effect of chemical structure and functionality of different multifunctional acrylate monomers on the curing behaviour of pigmented formulations was investigated.

scholarly journals Preparation and properties studies of UV-curable silicone modified epoxy resin composite system

2018 ◽  
Vol 16 (1_suppl) ◽  
pp. 170-176 ◽  
Author(s):  
Zhouhui Yu ◽  
Aiyong Cui ◽  
Peizhong Zhao ◽  
Huakai Wei ◽  
Fangyou Hu
Keyword(s):  
Heat Resistance ◽  
Epoxy Resin ◽  
Resin Composite ◽  
Curing Kinetics ◽  
Resin Content ◽  
Silicone Resin ◽  
Two Phase ◽  
Uv Curable ◽  
Humidity Resistance ◽  
Modified Epoxy

Introduction: Modified epoxy suitable for ultraviolet (UV) curing is prepared by using organic silicon toughening. The curing kinetics of the composite are studied by dielectric analysis (DEA), and the two-phase compatibility of the composite is studied by scanning electron microscopy (SEM). Methods: The tensile properties, heat resistance, and humidity resistance of the cured product are explored by changing the composition ratio of the silicone and the epoxy resin. Results: SEM of silicone/epoxy resin shows that the degree of cross-linking of the composites decreases with an increase of silicone resin content. Differential thermal analysis indicates that the glass transition temperature and the thermal stability of the composites decrease gradually with an increase of silicone resin content. The thermal degradation rate in the high temperature region, however, first decreases and then increases. In general, after adding just 10%–15% of the silicone resin and exposing to light for 15 min, the composite can still achieve a better curing effect. Conclusions: Under such conditions, the heat resistance of the cured product decreases a little. The tensile strength is kept constant so that elongation at breakage is apparently improved. The change rate after immersion in distilled water at 60°C for seven days is small, which shows excellent humidity resistance.

Synthesis and Characterization of UV-Thermal Dual Hybrid Curable Organosilicon Modified Epoxy Monoacrylates

2012 ◽  
Vol 152-154 ◽  
pp. 657-660
Author(s):  
Hong Bo Liu ◽  
Feng Lin ◽  
Wu Ying Zhang
Keyword(s):  
Fourier Transform ◽  
Synthesis Process ◽  
Synthesis And Characterization ◽  
Titration Method ◽  
Uv Curable ◽  
Oh Groups ◽  
Acrylic Ester ◽  
Modified Epoxy ◽  
Epoxy Groups

New UV-thermal dual hybrid curable organosilicon-modified epoxy monoacrylates (OMEMA) were synthesized in this study. The changes of NCO groups during the synthesis process of OMEMA were measured by chemical titration method, and its Fourier Transform Infrared (FTIR) spectra were investigated. The results indicate that organosilicon chain segments can be grafted onto the epoxy monacrylates (EMA) by the reaction of NCO and OH groups. The FTIR of OMEMA show that it contains both double bond of acrylic ester (UV curable) and epoxy groups (thermal curable).

Synthesis and characterization of acrylic modified epoxy prepolymers for UV-curable adhesives

Rare Metals ◽  
2011 ◽  
Vol 30 (S1) ◽  
pp. 567-571 ◽  
Author(s):  
Yichi Chen ◽  
Hongmei Zhang ◽  
Liqun Zhu ◽  
Tao He ◽  
Weiping Li ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Uv Curable ◽  
Modified Epoxy

Dual curing of cationic UV-curable clear and pigmented coating systems photosensitized by thioxanthone and anthracene

2003 ◽  
Vol 22 (6) ◽  
pp. 633-645 ◽  
Author(s):  
J.-D Cho ◽  
H.-K Kim ◽  
Y.-S Kim ◽  
J.-W Hong
Keyword(s):  
Uv Curable ◽  
Dual Curing

The maleimide modified epoxy resins for the preparation of UV-curable hybrid coatings

2009 ◽  
Vol 22 (2) ◽  
pp. 270-278 ◽  
Author(s):  
Zerrin Altıntaş ◽  
Sevim Karataş ◽  
Nilhan Kayaman-Apohan ◽  
Atilla Güngör
Keyword(s):  
Epoxy Resins ◽  
Hybrid Coatings ◽  
Uv Curable ◽  
Modified Epoxy

Study on Shrinkage of Cured Volume for UV-Curing Coatings

2015 ◽  
Vol 731 ◽  
pp. 588-592 ◽  
Author(s):  
Qing Kai Wang ◽  
Bei Qing Huang ◽  
Xian Fu Wei ◽  
Hao Chen Shen
Keyword(s):  
Free Radical ◽  
Uv Light ◽  
Uv Curing ◽  
Volume Shrinkage ◽  
Curing Temperature ◽  
Shrinkage Rate ◽  
Uv Curable ◽  
Cationic Resin ◽  
Polyester Acrylate ◽  
Radical Type

UV-Curable Coatings, Have been Widely Used in Machinery, Chemical Engineering, Biology, Medicine, Electronics and so on, due to their Fast Curing, Low Curing Temperature, Low VOC Emissions and Low Energy Cost. however, the Volume Shrinkage during the Curing Process Have a Great Influence on the Performance of the Coating, which Ofen Lowering Coating Adhesive Strength and Accelerating the Aging Process of Coatings Film.The Paper Select Different Kinds of Monomers (EOEOEA, HDDA, TPGDA, NPGDA, TMPTA and EO3- TMPTA) and Light Cured Resin (free Radical Type: Polyester Acrylate Resin 5600, Polyurethane Acrylate UA VP 2396, the Pure Acrylic 6536-1,cationic Resin: Epoxy Cationic Resin Omnilance OC3005) to Prepare the UV Curing Coatings. Study on the Influence of Amount of Monomer and Polymer on Polyreaction Reaction by Using Orthogonal Experimental Design Method in Order to Choose the Monomer and Polymer that has the Least Volume Shrinkage Rate, then Develop Photocureable Coating Based on Free Radical Type and Cationic Resin above. the Results Indicate that the UV-Light Photocureable Coating Prepared by Single Functionality Monomer EOEOEA and the DPGDA that Doesn’t Have Neat Molecular Structure has the Less Volume Shrinkage Rate; however, in the Aspect of Prepolymer, the Preparation of UV-Light Photocureable Coating Based on Polyester Acrylate 5600 has the Least Volume Shrinkage Rate. Rely on the Experiment Results above, Prepare the New Kind of UV-Light Photocureable Coating that has Little Volume Shrinkage Rate.

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