Study on the Combination Mechanism of the Water-Based UV Curable Ink and Paper

2015 ◽  
Vol 731 ◽  
pp. 488-491
Author(s):  
Fu Qiang Chu ◽  
Yu Xin Liu ◽  
Chang Li Xu
Keyword(s):  
Uv Curing ◽  
Curing Process ◽  
Double Bonds ◽  
Negative Effects ◽  
Uv Curable ◽  
Low Viscosity ◽  
Water Based ◽  
Ft Ir ◽  
Epoxy Acrylate Prepolymer

The bonding mechanism between water-based UV curable ink and active groups on paper’s fiber during curing process was studied in this paper. Low viscosity water-based UV-cured resin was synthesized by epoxy resins, epoxy diluent, acrylic acid and maleic anhydride in the presence of catalyst. The viscosity of the synthesis system and synthetic products were significantly reduced when epoxy diluent was added to replace parts of the epoxy resin. Epoxy diluent was very useful in reducing the viscosity of the product, but over-dose would have negative effects on the quality of the cured film. The water-based epoxy acrylate prepolymer was used as the substitution for the ink to investigate the binding mechanism between the active groups of prepolymer and fiber under UV irradiation. The prepolymer and photoinitiator were mixed and the mixture was diluted to an appropriate viscosity by a small amount of water, then printed on the paper by the method of analog printing and curred by UV curing machine. The printed paper was used to extract lignin by enzymatic/mild acidolysis. FT-IR was used to characterize the changes of the active groups in lignin. The results showed that the changes of active groups in lignin were founded in the existence of ultraviolet and photoinitiator, which consistent with the change of double bonds in prepolymer. The free radicals produced by photoinitiator in curing process not only promoted the double bonds to polymerize, but also accelerated the active groups of lignin binding. Experiments show that chemical bonds exist between them.

Formation of Barrier Ribs via Micro Molding Process Using UV-Curable Paste

2007 ◽  
Vol 534-536 ◽  
pp. 1029-1032
Author(s):  
Yong Seog Kim ◽  
Tae Gum Koh ◽  
Yoo Seong Kim
Keyword(s):  
Uv Curing ◽  
Processing Route ◽  
Curing Process ◽  
Plasma Display Panel ◽  
Molding Process ◽  
Uv Curable ◽  
Processing Cost ◽  
Plasma Display ◽  
Uv Curing Process ◽  
Sintering Shrinkage

In an attempt to reduce processing cost and to improve the resolution of PDPs, a micro mold transfer processing route for barrier ribs of plasma display panel was attempted. In this study, the parameters that may cause defects during the process were identified, which include the shrinkage during the UV curing process, stress due to the evaporation of organic components, and sintering shrinkage. Considering such parameters, a UV curable paste was developed and the barrier ribs of PDPs were successfully processed via the process. This work demonstrated the possibility of a build-up route in manufacturing barrier ribs of PDP

scholarly journals Isolation of Lycopene Component from Tamarillo (Solanum betaceum)

2021 ◽  
Vol 9 (2) ◽  
pp. 99-104
Author(s):  
Jeanne Dewi Damayanti ◽  
Ririn Azmilia ◽  
Zul Ainun ◽  
Nur Amin R. ◽  
M. Ilham Nurdin
Keyword(s):  
Group Analysis ◽  
Extraction Process ◽  
Premature Aging ◽  
Gas Chromatography Mass Spectrometry ◽  
Negative Effects ◽  
Bending Vibration ◽  
Ft Ir ◽  
Functional Group Analysis ◽  
Fruit Powder

Lycopene is a red pigment found in tamarillo with its function as an antioxidant that protects body cells from the negative effects of free radicals so that they do not trigger diseases, especially cancer and premature aging. This study was intended to improve the quality of tamarillo by isolating lycopene from tamarillo through an extraction process with chloroform as a solvent by maceration for 3 days at room temperature. The lycopene extract obtained was dissolved by means of a rotary evaporator at 40 oC under vacuum pressure and oven temperature at 60 oC. The lycopene obtained was analyzed by Gas Chromatography-Mass Spectrometry and the crystal structure of lycopene was characterized by Fourier Transform Infra-Red Spectroscopy. GCMS results showed that 0.21 g of lycopene was successfully isolated from 100 g of dried red tamarillo fruit powder. Functional group analysis using FT-IR at a wavelength of 978.23 cm-1 showed the R-CH=CH-R group; the -CH3- group of 1371.43 cm-1; the 1460.16 cm-1 indicates the bending vibration of -CH2-; the C=C chain of 1656.91 and 1745.64 cm-1; and the   C-H of 2856.67 and 2926.11 cm-1 of the lycopene chain.

Preparation and Characterization of UV Curable Hybrid System Based on Free Radical and Cationic Mechanism

2013 ◽  
Vol 470 ◽  
pp. 141-145 ◽  
Author(s):  
Li Juan Zhang ◽  
Chen Bo Wu ◽  
Fei Yang ◽  
Xiao Yi Geng ◽  
Meng Qian Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Free Radical ◽  
Hybrid System ◽  
Epoxy Group ◽  
Physical And Mechanical Properties ◽  
Uv Curing ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Uv Curable ◽  
Low Viscosity

A UV curable hybrid system with a dual mechanism of radical and cationic photo-polymerization, was investigated. A kind of free radical oligomer with low viscosity named hexahydrophthalic acid diglycidyl acrylate was first synthesized. The structure of the oligomer was characterization by FTIR. The UV curing processing of hybrid system was traced by real-time FTIR, and compared with free radical, cationic system. Thermal decomposition temperature and glass transition temperature of UV curing film for various system were determined by thermogravimetric analysis (TGA) and differental scanning calorimetry (DSC), respectively. And physical and mechanical properties of those curing films were analyzed and compared. The results show that the radical polymerization of double bond and cationic polymerization of epoxy group could occur simultaneously in hybrid system. The conversion rate of epoxy group for hybrid system was higher than that of epoxy group for cationic system, which demonstrated that the cationic photo-initiator (DPI·PF6) can be sensitized by the free radical photo-initiator (Irgacure 184). Compared with free radical and cationic system, the hardness and mechanical properties of hybrid system curing film were better than those of the cationic system curing film, while closed to those of free radical system.

scholarly journals Reducing of on Polymerization Shrinkage by Application of UV Curable Dental Restorative Composites

2014 ◽  
Vol 16 (3) ◽  
pp. 51-55 ◽  
Author(s):  
Jolanta Świderska ◽  
Zbigniew Czech ◽  
Waldemar Świderski ◽  
Agnieszka Kowalczyk
Keyword(s):  
Uv Curing ◽  
Polymerization Process ◽  
Dental Composites ◽  
Tetraethylene Glycol ◽  
Curing Process ◽  
Glycol Dimethacrylate ◽  
Uv Curable ◽  
Polymerization Shrinkage ◽  
Polyethylene Glycol 200 ◽  
Uv Curing Process

Abstract This manuscript describes dental compositions contain in-organic fillers, multifunctional methacrylates and photoinitiators. The main problem by application and UV curing process is the shrinkage of photoreactive dental materials during and after UV curing process. Total shrinkage of UV curable dental composites is a phenomenon of polymerization shrinkage, typical behavior for multifunctional methacrylates during polymerization process. The important factors by curing of dental composites are: kind and concentration of used methacrylates, their functionality, double bond concentration, kind and concentration of added photoinitiator and UV dose. They are investigated UV-curable dental compositions based on 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl)phenyl]propane (Bis-GMA) and containing such multifunctional monomers as 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), tetraethylene glycol dimethacrylate (T3EGDMA), trimethylolpropane trimethacrylate (TMPTMA), polyethylene glycol 200 dimethacrylate (PEG200DA). Reduction of polymerization shrinkage of dental compositions is at the moment a major problem by dental technology.

scholarly journals Enhanced thermoelectric performance of UV-curable silver (I) selenide-based composite for energy harvesting

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dabin Park ◽  
Seonmin Lee ◽  
Jooheon Kim
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Phonon Scattering ◽  
Uv Curing ◽  
Sem Images ◽  
Digital Light Processing ◽  
Uv Curable ◽  
Manufacturing Method ◽  
Low Viscosity

AbstractThermoelectric (TE) composites, with photocured resin as the matrix and Ag2Se (AS) as the filler, are synthesized by a digital-light-processing (DLP) based 3D printer. The mixture of diurethane dimethacrylate (DUDMA) and isobornyl acrylate (IBOA) is used as a UV-curable resin because of their low viscosity and high miscibility. Scanning electron microscopy (FE-SEM) images confirm that the filler retains its shape and remains after the UV-curing process. After completing curing, the mechanical and thermoelectric properties of the composite with different AS contents were measured. The addition of the AS filler increases the thermoelectric properties of the cured resin. When the AS contents increase by 30 wt.%, the maximum power factor was obtained (~ 51.5 μW/m·K2 at room temperature). Additionally, due to the phonon scattering effect between the interfaces, the thermal conductivity of composite is lower than that of pristine photoresin. The maximum thermoelectric figure of merit (ZT) is ~ 0.12, which is achieved with 30 wt.% of AS at 300 K with the enhanced power factor and reduced thermal conductivity. This study presents a novel manufacturing method for a thermoelectric composite using 3D printing.

Water-Based UV-Curable Polyurethane Based on Wheat Straw Lignin Obtained by Ethanol Extraction

2011 ◽  
Vol 295-297 ◽  
pp. 278-281
Author(s):  
Fu Qiang Chu ◽  
Xiang Jiao Wu
Keyword(s):  
Wheat Straw ◽  
Lignin Content ◽  
Average Particle Size ◽  
Uv Curing ◽  
Synthesis Process ◽  
Average Particle ◽  
Uv Curable ◽  
Ethanol Extraction ◽  
Water Based ◽  
Positive Effect

The aim of this paper is to discuss the application of ethanol-dissolved lignin in preparing high value products. Lignin was extracted from wheat straw by ethanol and used to prepare water-based UV-curable polyurethane. The preparation of water-based UV-curable polyurethane was completed by a three-step reaction. Besides lignin, toluene- 2, 4- diisocyanate (TDI), dimethylolpropionic acid (DMPA), 2-hydroxyethyl acrylate (HEA) and polyether glycol (PPG) were used. The effect of lignin content on the synthesis process was studied. The prepared lignin polyurethane was neutralized with tertiary amine (TEA) and dispersed in water. The properties of the final product, for example, rheological property, average particle size, UV-curing ability and mechanical property, etc. were characterized. Results indicated that the lignin polyurethanes could cure quickly and the presence of lignin with a proper proportion during the synthesis had a positive effect on the tensile strength of cured film.

Influence of Ink Fineness on the Performance of Water-Based Cork Paper Bobbin Gravure Ink

2011 ◽  
Vol 380 ◽  
pp. 40-43 ◽  
Author(s):  
Mao Jie Yu ◽  
Bei Qing Huang ◽  
Xian Fu Wei ◽  
Yu Bin Lv
Keyword(s):  
Abrasion Resistance ◽  
Great Influence ◽  
Low Viscosity ◽  
Printing Quality ◽  
Water Based

To survey the influence of ink fineness on the performance of the water-based cork paper bobbin gravure ink and improve the printing quality of ink, the water-based cork paper bobbin gravure inks with different pigment fineness were prepared and the viscosity of ink, glossiness of the printing proof, the abrasion resistance of ink film and other property parameters were tested. The research shows that the ink fineness has a great influence on the water-based cork paper bobbin gravure ink. If the ink fineness is bad, the ink would have a low viscosity. If the ink fineness is good, the glossiness of the printing proof and the abrasion resistance of ink film would be high.

Study of acrylic emulsion for ultraviolet curable pressure sensitive adhesives and its properties

2011 ◽  
Vol 40 (6) ◽  
pp. 374-378 ◽  
Author(s):  
Nishant Bhore ◽  
Prakash Mahanwar
Keyword(s):  
Uv Curing ◽  
Cohesive Strength ◽  
Pressure Sensitive Adhesive ◽  
Acrylic Emulsion ◽  
Uv Curable ◽  
Performance Properties ◽  
Content Type ◽  
Pressure Sensitive ◽  
Water Based ◽  
Peel Adhesion

PurposeThe purpose of this paper is to synthesise UV curable emulsion latex and to study characteristics and various performance properties such as tackiness, peel adhesion and cohesive strength for pressure sensitive adhesive (PSA) application after UV curing.Design/methodology/approachThe two component water‐based ultraviolet (UV) curable acrylate PSAs were synthesised by emulsion copolymerization. The synthesised emulsion samples were characterised and various performance properties such as tackiness, peel adhesion and cohesive strength for PSAs were tested after UV curing.FindingsThe thermal analysis showed the effect of methyl methacrylate (MMA) content on the glass transition temperature of emulsions, which had significant effect on tack. Effects of varying concentration of multifunctional monomer trimethylolpropane triacrylate (TMPTA) and UV exposure time on properties of UV curable PSA were also studied.Research limitations/implicationsThe results associated with the UV curable water based PSA has certain advantages, such as low VOC and fast curing rate and with the scope for further research by using the radiations with different intensities or other radiation systems such as electron beam curing.Practical implicationsPractically the UV water based PSAs are already in industrial use for glass lamination, silicon semiconductor dicing, and in medical use for band aids and drug delivery systems and for dental applications for cavity filling.Originality/valueThe water based UV curable PSA synthesised by emulsion polymerization had very good tackiness properties with lower MMA content. It was observed that the lower the concentration of TMPTA, the better the performance properties, such as tack and peel strength. It was also observed that with increasing TMPTA concentration the cohesive strength increased.

Can trust become a factor of economic growth? Dynamic changes in the level of trust of Russian youth

2020 ◽  
pp. 92-107 ◽  
Author(s):  
A. I. Bakhtigaraeva ◽  
A. A. Stavinskaya
Keyword(s):  
Institutional Environment ◽  
Negative Effects ◽  
Dynamic Changes ◽  
Generalized Trust ◽  
Level Of Education ◽  
Advantages And Disadvantages ◽  
The Future ◽  
Analysis Of Dynamics

The article considers the role of trust in the economy, the mechanisms of its accumulation and the possibility of using it as one of the growth factors in the future. The advantages and disadvantages of measuring the level of generalized trust using two alternative questions — about trusting people in general and trusting strangers — are analyzed. The results of the analysis of dynamics of the level of generalized trust among Russian youth, obtained within the study of the Institute for National Projects in 10 regions of Russia, are presented. It is shown that there are no significant changes in trust in people in general during the study at university. At the same time, the level of trust in strangers falls, which can negatively affect the level of trust in the country as a whole, and as a result have negative effects on the development of the economy in the future. Possible causes of the observed trends and the role of universities are discussed. Also the question about the connection between the level of education and generalized trust in countries with different quality of the institutional environment is raised.

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