Papers by Keyword: Paint

Abstract: The values of the system energy change caused by the structure formation of coatings based on paints using mineral binders are given. It is established that the process of curing coatings can be described using the first law of thermodynamics and thermodynamic potential - enthalpy. The main regularities of changes in thermodynamic parameters in the process of curing coatings on cement concretes depending on the curing time, the porosity of the substrate is revealed. It has been established that, depending on the type of coatings, there is an unequal change in the energy of structure formation, which allows predetermining the different operational durability of coatings. It is shown that the smallest change in entropy during the curing process is characteristic of coatings on substrates characterized by lower surface porosity. The increase in entropy in the process of curing coatings on substrates with high porosity suggests that the coatings are characterized by a greater defectiveness and, consequently, a greater probability of their destruction during operation. The increase in the surface porosity of the cement substrate reduces the adhesion strength of the coatings and reduces its durability during exposure to the environment.

Abstract: How to extend your lifetime before you start using it or more often during use is a matter for every investor. In this paper, we will try to assess whether the use of protective coatings on concrete floors has a positive effect on the service life. The referee in our case will be the highly abrasive test method Böhme, which determines abrasion resistance. For comparison, we chose coatings based on sodium silicate solution, ie water glass. The market for these protective coatings is very diverse, so we have chosen to select products of renowned and unknown producers in different price ranges to cover the widest possible market.

Abstract: Hot-dip galvanized steel surfaces are cleaned, pre-treated with titanium-containing solution and then painted for use. Removal of the alumina layer from galvanized steel surfaces during the cleaning process is essential before effective paint application. Bad adhesion results if the alumina layer is not completely removed, and an insufficient concentration and uneven distribution of titanium oxide is formed across the galvanized surface during pre-treatment. The alkaline cleaner concentration must be optimized to ensure effective removal of the alumina layer. Hot-dip galvanized steel samples were cleaned using typical line conditions and cleaning solutions with varying free alkalinities. The alumina layer was then measured on each sample by glow-discharge optical emission spectroscopy. Thereafter, the samples were treated with titanium-containing pre-treatment solution. The titanium oxide concentration was measured by inductively coupled plasma optical emission spectroscopy. It was found that a free alkalinity of at least 3.2 mEq/L is required to fully remove the alumina layer. The alumina-free samples also gave a titanium oxide layer after pre-treatment within the target concentration of 4–8 mg/cm². A free alkalinity of 3.5 ml was thereafter implemented commercially: analysis of samples from two galvanizing lines showed no presence of alumina, a uniform titanium oxide distribution across the widths of the line samples and acceptable titanium concentrations.

Abstract: The objective of this research is to improve process capability and reduce production cost related to thickness of paint from Electro Deposition Painting (EDP) process. To achieve the objective, Six Sigma method was applied to find out the optimal setting of significant process factors, which are concentration of pigment in EDP paint, dipping time, and dipping voltage. Design of experiment technique with Central Composite Design type helped indicate the optimal setting of the three factors, which yielded the target EDP coating thickness with a minimal production cost. With this optimal setting, the process capability index (C_pk) increased from 0.61 to 1.99, and the production cost is expected to reduce by 1,730,498 THB per year.

Abstract: In this study, the potential of rust as a pigment in paint technology via sintering process was investigated. Iron (III) nitrate was the raw material used to make rust or iron oxide. The characteristics of iron oxide were analyzed. Moreover, iron oxide was mixed with other chemical components to make paint. The properties of paint in both liquid state and solid state were determined by portable field viscometer, pH indicator, glossmeter, pencil hardness test, and tape adhesive test. The optimum ratio of paint components for this study where used iron oxide as pigment. The other properties of pigments and paints will be conducted in the analysis study.

Abstract: A New emulsion type paint was prepared by utilizing polyol for the production of polyurethane by reaction with an isocyanate was obtained by the synthesis of palm oil-based oleic acid with glycerol. Dodecylbenzene sulfonic acid (DBSA) was used as catalyst and emulsifier. The various methods for preparing Polyurethane /clay nanocomposites, but in this research the author choice by a pre-polymer method and were evaluated by fourier transform infrared (FTIR) spectra to determine micro-domain structures of segmented PU. The molecular weight (MW) of polyol was obtained by using gel permeation chromatography (GPC) and the result was about 950. The micro domain structures of the segmented PU were analyzed by FTIR by following the work of Seymour, et.al. to estimated the degree of phase separation in segmented PU. The formation of hydrogen bonding by C=O group can be determined by examining the peak position at 1709 cm^-1 for hydrogen bonded C=O and at 1731 cm^-1 for free C=O. The molecular weight (MW) of PU based on palm oil was about 3.266. The performance characteristics of materials indicate to be comparable with the corresponding industrial standard.

Abstract: In this work, a high performance, environmentally friendly and waterborne inorganic zinc-rich coating based on geopolymer was developed and applied as protective coating of steel substrate. The geopolymer was the main ingredient of the zinc-rich paint (ZRP), and the zinc powder and additives were added to geopolymer to prepare ZRP. The corrosion protection behaviors of ZRP with different kinds of zinc powder and various zinc contents were characterized by electrochemical protection performance test. The results showed that coatings with 55 wt% spherical zinc powder and 25 wt% lamellar zinc powder exhibited good corrosion resistance mainly because of the cathodic protection and barrier effect.

Abstract: An organically modified clay and a pristine clay were used to prepare biodegradable thermoplastic polyurethane (PU) paint/clay nanocomposites. In this paper, polyurethane paint /clay nanocomposites base on palm oil polyol were prepared by isocyanate, polyol and organoclay (a clay modified with Cetyl trimethyl ammonium Bromide (CTAB) and Octadecylamines (ODA). The morphologies of samples were revealed by transmission electron microscopy (TEM) and Intercalation of PU into clay galleries and crystalline structure of PU were investigated using X-ray diffraction (XRD). The morphology of the resulting composite showed a combination of intercalated and partially exfoliated clay layers with occasional clay aggregates

Abstract: The title introduced Anion anionic additive, character and application. Anionic additive can apply in paint, textile, coating, foam, plastic, etc. The structure of opal shale and the mechanism of release anion were discussed. The opal shale was comminuted by the airflow method. The average diameter of the opal shale granule was observed by granularity instrument. The result indicated that size is about 0.40-5.0μm. The printing poplin with high performance was achieved by intermingle technology and the generally printing means. The anion number (4000 ions /cm³) in printing poplin was measured.

Abstract: The development of non-hexavalent chromium conversion coating on aluminum alloy is imminent, hexavalent chromium Cr6+ compounds have serious threat to the environment. The appearances, viscosity, particle size of aluminum nitrate sol prepared by re-dissolving were tested by orthogonal experiment. The results show that a better condition for preparing sol by re-dissolving the aluminum nitrate sol is: [Al3+] of 0.3mol/L, sol at 55~85°C or 0.6mol/L, at 55°C. The pH value ranges 7~9 before re-dissolving. The salt spraying resistance for the sol-gel film prepared by sol of which viscosity ranges 4.8 ~ 6 mPa/s is better than five grade. The dry adhesion for paint film is qualified when viscosity ≤ 5.6 mPa/s and the average size of particles <920 nm for sol. In terms of sol appearance, dry adhesion and salt spray properties of the sol-gel film made by blue and white or gray sol are good. [Al3+] concentration and sol temperature for preparing sol-gel film with better corrosion resistance are equally important, secondly is pH before re-dissolved. Dry adhesion between paint film and aluminum alloy is qualified when [Al3+] ranges 0.3 ~0.6mol/L. Corrosion resistance for alumina sol-gel film of [Al3+] concentration of 0.3 and 0.77mol/L is worse than that of 0.6mol/L. The times of spray coating has no influence on corrosion resistance, while the increased frequency of coating times, and film adhesion decrease. In short, if you want that painting film adhesion and corrosion resistance are both good, Al3+ concentration should be 0.6mol/L for pure aluminum sol. The preferable prepared conditions are that aging at 55 °C, pH of sol re-dissolved with nitric acid is 4 after adding ammonia until pH reaches 8, coated one times, two or more times, the adhesion of the coating will reduce.