Optimization of Flexographic Water-Based Ink Formulation for Polymer Films

2021 ◽  
pp. 446-451
Author(s):  
Nguyen Thi Thu Ha ◽  
Duong Hong Quyen ◽  
Hoang Thi Kieu Nguyen
Keyword(s):  
Contact Angle ◽  
Factorial Design ◽  
Wetting Agent ◽  
Optimal Conditions ◽  
Polymer Substrates ◽  
Desirable Response ◽  
Water Based ◽  
Optimized Conditions ◽  
Experimental Strategies ◽  
Ink Formulation

In this study, the optimization of flexographic water-based ink formulation was carried out. The aim is to minimize the contact angle of the ink on polymer substrates. A factorial design was used to evaluate the effects and interactions of three factors, which are dispersant, wetting agent and antifoam concentration on the wettability of ink. The optimal conditions obtained from the desirable response are dispersant of 9.65%, wetting agent of 0.58% and antifoam of 0.55 %. Under these conditions, about 15O of contact angle is obtained. The validity of the statistical experimental strategies was verified by the ink samples prepared under the optimized conditions.

scholarly journals Optimization of Technical Parameters on the Color Variation in offset Printing Process

2019 ◽  
pp. 229-234
Author(s):  
Tu Thanh Nam ◽  
Hoang Thi Kieu Nguyen
Keyword(s):  
Factorial Design ◽  
Color Difference ◽  
Color Variation ◽  
Optimal Conditions ◽  
Offset Printing ◽  
Printing Process ◽  
Optimization Of Parameters ◽  
Technical Parameters ◽  
Desirable Response ◽  
Ink Transfer

In this study, the optimization of parameters of the printing process was carried out. The aim is to minimize the size of color variation in prints. A factorial design was used to evaluate the effects and interactions of three factors, that is, impression pressure, alcohol %, and press speed. The color variation is gauged by variation in ink transfer, which is governed by color difference (?E). The optimal conditions obtained from the desirable response are impression pressure of 0.15 mm, alcohol percentage of 12.2 % and press speed of 8500 sheets per hour. Under these conditions, about 0.62 of color difference is obtained.

scholarly journals Optimization of banana crop by-products solvent extraction for the production of bioactive compounds

2021 ◽  
Author(s):  
Sara Díaz ◽  
Antonio N. Benítez ◽  
Sara Ramírez-Bolaños ◽  
Lidia Robaina ◽  
Zaida Ortega
Keyword(s):  
Antioxidant Activity ◽  
Aqueous Ethanol ◽  
Ethanol Concentration ◽  
Extraction Process ◽  
Total Phenol Content ◽  
Optimal Conditions ◽  
Satisfactory Description ◽  
Optimized Conditions ◽  
By Products ◽  
Banana Crops

AbstractThe aim of this work is the optimization of phenolic compound extraction from three by-products of banana crops (rachis, discarded banana, and banana’s pseudostem pulp), as a way to valorize them through a green extraction process. The influence of the temperature and aqueous ethanol concentration (Et-OH) on extract properties (total phenol content (TPC) and antioxidant activity) was firstly analyzed. 78 ℃ and ethanol concentrations close to 50% yielded the best results for the three materials. The equations obtained by the response surface methodology gave a satisfactory description of the experimental data, allowing optimizing the extraction conditions. Under optimized conditions, time influence was then assessed, although this parameter seemed not influence results. Among the three by-products, rachis extract (60% Et-OH, 78 ℃, and 30 min) presented the highest TPC (796 mg gallic acid/100 g of dried material) and antioxidant activity (6.51 mg Trolox equivalents/g of dried material), followed by discarded banana, and pseudostem pulp. Under the optimal conditions, experiments were performed at a larger scale, allowing to determine the extraction yields (EY) and to characterize the extracts. The highest EY was obtained for the rachis (26%), but the extract with the highest activity was obtained for discarded banana (50% Et-OH, 78 ℃, and 60 min), which presented a TPC of 27.26 mg/g extract corresponding to 54.59 mg Trolox equivalents/g extract. This study contributes to the valorization of banana crops residues as a source of polyphenolic compounds with bioactive functions that can be extracted under economic extraction conditions. Graphical abstract

Preparation and Water Resistance of the New Water Epellent Agent of Paper Lunch Boxes

2011 ◽  
Vol 236-238 ◽  
pp. 1199-1202
Author(s):  
Shu Fang Zhou ◽  
Chuan Shan Zhao ◽  
Jing Jing Wang
Keyword(s):  
Contact Angle ◽  
Water Resistance ◽  
Dry Weight ◽  
Water Repellent ◽  
Optimal Conditions ◽  
Mass Ratio ◽  
Domestic Water ◽  
Oil Resistance ◽  
Effect Of Water

In this paper, a kind of sizing synergist,AKD,cationic rosin(CRS) and oil resistance agent were mixed in different proportions, we make it as a kind of new water repellent agent ,and for internal sizing. The best dosage and the composite ratio of the synergist, AKD, cationic rosin and oil resistance agent was discussed mainly in this experiment. And then the copy paper were tested of the substanceweight and contact angle, and compared with the water resistance when the domestic water repellent agent or AKD was added alone. Conclusions of this experiment are following: the optimal conditions were that the mass ratio of AKD and CRS is 6:4, the additive level of AKD and the cationic rosin is 6% (based on dry weight of pulp), the quantity of the sizing synergist is 0.5% , and no oil resistance agent was added, the effect of water resistance is best.

scholarly journals Weath ering Performance of Beech Wood Coated with Acrylic Paint Containing UV Stabilizers of Dihydroxy Benzophenone and Nano Zinc Oxide

2020 ◽  
Vol 71 (4) ◽  
pp. 403-409
Author(s):  
Mehrnaz Akbarnezhad ◽  
Davood Rasouli ◽  
Hossein Yousefi ◽  
Mahdi Mashkour
Keyword(s):  
Contact Angle ◽  
Zinc Oxide ◽  
Beech Wood ◽  
Mold Growth ◽  
Acrylic Paint ◽  
Color Changes ◽  
Acrylic Coating ◽  
Nano Zinc Oxide ◽  
Water Based ◽  
Nano Zinc

In this study, the effect of UV stabilizers (dihydroxy benzophenone and nano zinc oxide) on the weathering degradation of water-based acrylic coating on beech wood was investigated. The wood specimens were coated by brush and then weathered naturally for six months. The obtained results showed that the use of nano zinc oxide reduced color changes and mold growth on the surface of weathered samples. However, the results of contact angle, pull-off adhesion, colorimeter and FTIR revealed that the dihydroxyl benzophenone was not effective in preventing weathering degradation of coated wood.

Supercritical CO2 Extraction of Plumula nelumbinis Oil Rich in γ-Sitosterol Using Response Surface Methodology

2013 ◽  
Vol 864-867 ◽  
pp. 213-216
Author(s):  
Dong Dong Jia ◽  
Rong Lan ◽  
Yong Yue Sun
Keyword(s):  
Response Surface Methodology ◽  
Factorial Design ◽  
Response Surface ◽  
Surface Analysis ◽  
Full Factorial Design ◽  
Response Surface Analysis ◽  
Optimal Conditions ◽  
Full Factorial

Supercritical CO2extraction ofPlumula nelumbinisoil rich in γ-sitosterol was investigated with a 42full factorial design and response surface analysis. At optimal conditions (P=35 MPa,T=55 C,dp=0.22 mm,Q=2.0 L/min), the yield of the extracted oil was up to 12.2%, in which the concentration of γ-sitosterol was 7.38%, indicating that the γ-sitosterol contents inPlumula nelumbinisand its oil were much higher than that in other vegetables.

Thickness of gravity-flattened water layers (“puddles”) deposited on the polymer substrates and the hysteresis of the contact angle

2010 ◽  
Vol 372 (1-3) ◽  
pp. 135-138 ◽  
Author(s):  
Edward Bormashenko ◽  
Albina Musin ◽  
Roman Pogreb ◽  
Eitam Luz ◽  
Michael Zinigrad
Keyword(s):  
Contact Angle ◽  
Polymer Substrates ◽  
Water Layers

scholarly journals Experimental study on the influence of coal powders on the performance of water-based polymer drilling fluid

2020 ◽  
Vol 38 (5) ◽  
pp. 1515-1534
Author(s):  
Lei Zhang ◽  
Xiaoming Wu ◽  
Shuaifeng Lyu ◽  
Penglei Shen ◽  
Lulu Liu ◽  
...  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Coalbed Methane ◽  
Drilling Fluid ◽  
Wellbore Stability ◽  
Filtration Loss ◽  
Water Based ◽  
Natural Degradation ◽  
Tension Increase ◽  
Powder Content

Coal powders, as cuttings, invade the drilling fluid along a coal seam during coalbed methane development, thereby changing the properties of the drilling fluid. Therefore, this work aims to investigate the influence of coal powders on drilling fluid performance. The powders of lignite, anthracite, and contrasting shale were added to a water-based polymer drilling fluid. Then, the rheology, filtration, lubricity, and adhesiveness were measured, and the natural degradation, as well as the wettability were further evaluated. The results show that some parameters of the drilling fluid, including viscosity, lubrication coefficient, adhesion coefficient, contact angle, and surface tension, increase after adding coal powders, while other parameters, such as filtration loss and natural degradation, decrease. Compared with lignite and shale, anthracite powders, with the lowest mineral content, exhibit the smallest change in the rheological property, lubricity, adhesion, and natural degradation of the drilling fluid. Moreover, the content and size of the coal powders generally have opposing effects on the drilling fluid. When the coal powder content reaches 3 wt.%, the surface tension and contact angle of the drilling fluid show more evident changes than other parameters. Based on the analysis of the stress intensity factor, the drilling fluid with coal powders exceeding 100 mesh can reduce the capillary force in microfractures, and in combination with other factors (such as reduced filtration loss and sealing and supporting of the microfractures), improves wellbore stability. Therefore, coal powders with suitable particle sizes and concentration levels are expected to become a new drilling fluid material to protect coal field reservoirs.

Water-Based Coatings for Building Part I: Preparation and Physical Properties of Polyacrylate-Siloxane Emulsion

2012 ◽  
Vol 174-177 ◽  
pp. 520-523 ◽  
Author(s):  
Pei Wang ◽  
Xia Zhen Zhang ◽  
Li Na Heng ◽  
Teng Yu ◽  
Xie Wei Chen ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Physical Properties ◽  
Optimal Conditions ◽  
Pencil Hardness ◽  
Emulsion Copolymerization ◽  
Stirring Rate ◽  
Water Based ◽  
Acrylate Emulsion ◽  
Vinyl Triethoxysilane ◽  
Silicone Acrylate

This study is to report the synthesis of polyacrylate-siloxane latex with vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also analysized by water absorption, pencil hardness, circle adhesion method, etc.. The polymerization factors for emulsion had been discussed in several aspects. The results showed that the optimal conditions for synthesizing silicone-acrylate emulsion were of DB -151content of 6%~8%, emulsifier OP-10/SDS/ DNS-458 ratio:2/1/1, in stirring rate 450 r/min in the period of disperse and emulsification, stirring rate 200 r/min in the period of synthesis, with reaction temperature 75°C.

scholarly journals Fluvial seeding of cyanobacterial blooms in oligotrophic Lake Superior

2020 ◽  
Author(s):  
Kaitlin L. Reinl ◽  
Robert W. Sterner ◽  
Brenda Moraska Lafrancois ◽  
Sandra Brovold
Keyword(s):  
Factorial Design ◽  
Lake Superior ◽  
Cyanobacterial Blooms ◽  
Optimal Conditions ◽  
Light Conditions ◽  
Coastal Lake ◽  
Ambient Temperatures ◽  
Potential Sources ◽  
Source Zones ◽  
Growing Conditions

AbstractLake Superior has recently begun experiencing cyanobacterial blooms comprised of Dolichospermum lemmermannii near the Apostle Islands and along the southern shore of the western arm. Little is known about the origin of these blooms. Experiments were conducted during the summers of 2017 and 2018 to identify sources of propagules and characteristics of sites that were potential sources. The 2017 experiments were conducting using a factorial design with three source zones (Harbor, River, and Lake), two nutrient conditions (high and low N:P), and three temperatures (15, 20, and 25 °C). At the end of the experiment, cyanobacteria were most abundant from the ‘River’ and ‘Harbor’ zones at low N:P and 20 and 25 °C, with D. lemmermannii most abundant at 20 °C. Subsequently in 2018 we evaluated 26 specific inland locations from three waterbody types (Coastal, Lake/Pond, and River) and explored similarities among those sites that produced cyanobacteria in high abundance when samples were incubated under optimal conditions (low N:P and 25 °C). Under these growing conditions, we found high cyanobacteria abundance developed in samples from river sites with low ambient temperatures and high conductivity. Field monitoring showed that Lake Superior nearshore temperatures were higher than rivers. These observations suggest that blooms of D. lemmermannii in Lake Superior are initiated by fluvial seeding of propagules and highlight the importance of warmer temperatures and favorable nutrient and light conditions for subsequent extensive cyanobacterial growth. We argue that the watershed is an important source of biological loading of D. lemmermannii to Lake Superior, and that when those cells reach the nearshore where there is warmer water temperatures and increased light, they can grow in abundance to produce blooms.

An Analysis of how Water-Based Ink Affects the Low Energy Surface Wettability

2011 ◽  
Vol 287-290 ◽  
pp. 1383-1387
Author(s):  
Ling Jia ◽  
Bei Qing Huang ◽  
Xian Fu Wei ◽  
Na Feng
Keyword(s):  
Surface Tension ◽  
Isopropyl Alcohol ◽  
Energy Surface ◽  
Base Material ◽  
Low Energy ◽  
Wetting Agent ◽  
Surface Wettability ◽  
Surface Wetting ◽  
Water Based ◽  
Surface Contact Angle

Water-based ink in low-energy surface wetting more difficult and hinder its application. In order to solve water ink in low-energy on the surface wettability problem, change the kind of cosolvent, kind and content of surfactants prepared ink. They were tested in low-energy CD the surface contact Angle to examine wettability of ink, test the surface tension, ink affecting wettability factors were analyzed. Results show that: in water-based ink add isopropyl alcohol, flow ping agent 432 and substrate wetting agent 245, can better improve its surface wettability in low-energy, and base material wetting agent 245 content about 1.25% wet effect is good.

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