Enhancement of Physico-mechanical Properties of Plywood Surface with Urethane Acrylate (M-1200) by UV Curing Method
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Several UV-curable formulations containing urethane acrylate (M-1200) oligomer with a trifunctional monomer, trimethylol propane triacrylate (TMPTA), and photoinitiator Irgcure-369 were developed to improve the surface of plywood. Thin polymer films were prepared on glass plate with these formulated solutions and finally applied on polished plywood surface to modify the surface, and both were cured under UV-radiation. The properties of UV-cured thin films were studied as a function of UV-radiation intensities. Pendulum hardness (PH) and gel content were found to increase with the increase of TMPTA concentration up to a certain level and with further increase of monomer concentration the physical properties were decreased. The polymer-coated surface yielded enhanced physico-mechanical properties compared to that of unmodified surface.Keywords:
TMPTA
UV-Curing
Propane
TMPTA
Bulk polymerization
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Thioxanthone
TMPTA
Hexafluorophosphate
Acrylate polymer
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Abstract An dendritic acrylate oligomer with eight double bonds (DAO) was synthesized by Michael addition reaction of ethylene diamine (EDA) and trimethylolpropane triacrylate (TMPTA) under mild conditions, and was easily separated from the reaction system with methanol. The structure of DAO was characterized by IR, 1 H‐NMR, and elemental analysis. DAO is UV curable oligomer with low viscosity and high curing speed. Its viscosity was 10.85% of that of the linear acrylic oligomers with similar molecule weight (EBECRYL Resin 285). With Darocure 1173 as the photoinitiator, the curing speed of DAO was respectively 7.5 and 10.3 times higher than that of EBECRYL Resin 605 and EBECRYL Resin 285. Furthermore, the effect of the photoinitiator and active diluent on curing speed of DAO UV curing system was studied. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1018–1022, 2004
TMPTA
Oligomer
UV-Curing
Prepolymer
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TMPTA
Acrylate polymer
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The aim of this work was to study the effect of the components of UV varnish on the glossiness, adhesion fastness and curing time of the copper printing paper after polishing, and to develop a UV varnish formula with good performance for copper printing paper. Appropriate prepolymer, monomer and photoinitiator were selected to prepare different UV varnish by changing the contents of the components. The changes of the performance were observed. The best formula was prepolymer epoxy acrylate(30%), PUA(15%); Monomer TMPTA(36%), TPGDA(4.5%), DPGDA(4.5%);Photoinitiator Irgacure 907(3.6%),Darocure184(0.9%), BYK-320(0.5%). The glossiness and adhesion fastness of the copper printing paper were improved and the film curing time was shortened when the prepolymer EA∶PUA was 2∶1,photoinitiator 907∶184 was 4∶1, and monomer TMPTA∶TPGDA∶DPGDA was 8∶1∶1.
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Prepolymer
UV-Curing
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The popularity of using the photopolymerization reactions in various areas of science and technique is constantly gaining importance. Light-induced photopolymerization is the basic process for the production of various polymeric materials. The key role in the polymerization reaction is the photoinitiator. The huge demand for radical and cationic initiators results from the dynamic development of the medical sector, and the optoelectronic, paints, coatings, varnishes and adhesives industries. For this reason, we dealt with the subject of designing new, highly-efficient radical photoinitiators. This paper describes novel photoinitiating systems operating in UV-Vis light for radical polymerization of acrylates. The proposed photoinitiators are composed of squaraine (SQ) as a light absorber and various diphenyliodonium (Iod) salts as co-initiators. The kinetic parameters of radical polymerization of trimethylolpropane triacrylate (TMPTA), such as the degree of double bonds conversion (C
TMPTA
Cationic polymerization
Trimethylolpropane
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A facile measuring apparatus for studying filter effect on UV curing reaction of acrylate monomers was prepared. Correlation of depth of curing of the monomer and conversion of C= C double bond was examined with this apparatus. The conversion of C=C of the monomer decreased from 75.0% to 19.5%with increasing depth of curing of 2-ethyl-2-hydroxymethy1-1, 3-propanediol triacrylate (TMPTA) under UV irradiation with 40 mJ/cm2 owing to filter effect of acrylate monomer and photoinitiator. The depth of curing of the monomer increased with an decrease in the concentration of photoinitiator in monomer. The depth of curing showed the largest value by use of TMPTA for monomer and 2-methyl1-[4- (methylthio)pheny1]-2-morpholino-1-propanone for photoinitiator.
TMPTA
UV-Curing
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TMPTA
Bulk polymerization
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Photopolymerization process of UV curable coatings based on epoxy acrylate/tripropylene glycol diacrylate was monitored by Raman spectroscopy. The consumption of C=C double bond in coatings was observed under UV irradiation. Quantitative analysis of curing degree versus UV irradiation time was investigated by fitting Raman spectra. The results indicated that the initiation efficiency of cleavage type photoinitiators and Irgacure 184 are superior to that of hydrogen-abstraction type photoinitiator. High photoinitiator concentration is beneficial for achieving fast photopolymerization rate and high final conversion. However, when the concentration of photoinitiator exceeds a certain value, the polymerization rate and final conversion will not increase evidently because of initiation efficiency and free volume effect.
UV-Curing
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