scholarly journals Self-crosslinking acrylic latexes containing nanoparticles ZnO with increased corrosion and chemical resistance of coating

2019 ◽  
Vol 63 (2) ◽  
pp. 94-99
Author(s):  
M. Danková ◽  
A. Kalendová ◽  
J. Machotová
Keyword(s):  
Chemical Resistance ◽  
Film Formation ◽  
Paint Film ◽  
Chemical Properties ◽  
Formation Mechanisms ◽  
Coating Materials ◽  
Shell System ◽  
Water Based ◽  
Acrylic Latexes ◽  
Paint Films

Abstract The requirements put on coating materials are more and more stringent mainly in the environmental domain, especially as regards VOC emissions. This is why water-based binders as alternatives to solvent-based binders, to provide paints possessing equally good use properties, are intensively sought. The objective of this work was to assess the anticorrosion and chemical properties of paint films based on new self-cross-linking acrylic latexes. The latexes were synthesized via two--step emulsion polymerisation to obtain a core-shell system. Nanostructural ZnO in an amount of 1.5 wt. % was added to the system during the latex binder synthesis. Paints with an enhanced corrosion resistance and chemical resistance of the films were prepared. The binders prepared were pigmented with anticorrosion pigments and their properties were compared to those of commercial water-based dispersions with either identical or different paint film formation mechanisms. The results gave evidence that if a well-selected pigment is used, the binders can be used to obtain anticorrosion coating materials for metallic substrates.

Surface Modification of Poly (alkyl/Arylphosphazene) Thin Films

2000 ◽  
Vol 629 ◽  
Author(s):  
John V. St. John ◽  
Patty Wisian-Neilson
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Chemical Resistance ◽  
Chemical Properties ◽  
Inorganic Polymers ◽  
Thin Polymer Films ◽  
Hydrophilic Interactions ◽  
Carboxylic Acid Groups ◽  
Polymer Interface ◽  
Thin Polymer

ABSTRACTPoly (methylphenylphosphazene) (PMPP) is an example of a unique class of inorganic polymers with alternating – (P=N)– backbones. Chemical modification of bulk PMPP can result in changes of physical properties such as chemical resistance, onset temperature of thermal degradation, elasticity, and flexibility. Surface modification of PMPP allows tailoring of the chemical properties at the polymer interface while maintaining the integrity of the bulk polymer. In this research, PMPP thin films were treated to form carboxylate or carboxylic acid groups at the surface. Surface modification was monitored by following changes in contact angle. The hydrophobic/hydrophilic interactions of carboxylated PMPP surfaces allow for mesoscale interactions of thin polymer films.

Substituent Effects on the Thermal Decomposition of Phosphate Esters on Ferrous Surfaces

2019 ◽  
Author(s):  
James Ewen ◽  
Carlos Ayestaran Latorre ◽  
Arash Khajeh ◽  
Joshua Moore ◽  
Joseph Remias ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Film Formation ◽  
Substituent Effects ◽  
Vapour Phase ◽  
Industrial Applications ◽  
Phosphate Esters ◽  
Antiwear Additives ◽  
Formation Mechanisms ◽  
Phosphate Ester ◽  
Wide Range

<p>Phosphate esters have a wide range of industrial applications, for example in tribology where they are used as vapour phase lubricants and antiwear additives. To rationally design phosphate esters with improved tribological performance, an atomic-level understanding of their film formation mechanisms is required. One important aspect is the thermal decomposition of phosphate esters on steel surfaces, since this initiates film formation. In this study, ReaxFF molecular dynamics simulations are used to study the thermal decomposition of phosphate esters with different substituents on several ferrous surfaces. On Fe<sub>3</sub>O<sub>4</sub>(001) and α-Fe(110), chemisorption interactions between the phosphate esters and the surfaces occur even at room temperature, and the number of molecule-surface bonds increases as the temperature is increased from 300 to 1000 K. Conversely, on hydroxylated, amorphous Fe<sub>3</sub>O<sub>4</sub>, most of the molecules are physisorbed, even at high temperature. Thermal decomposition rates were much higher on Fe<sub>3</sub>O<sub>4</sub>(001) and particularly α-Fe(110) compared to hydroxylated, amorphous Fe<sub>3</sub>O<sub>4</sub>. This suggests that water passivates ferrous surfaces and inhibits phosphate ester chemisorption, decomposition, and ultimately film formation. On Fe<sub>3</sub>O<sub>4</sub>(001), thermal decomposition proceeds mainly through C-O cleavage (to form surface alkyl and aryl groups) and C-H cleavage (to form surface hydroxyls). The onset temperature for C-O cleavage on Fe<sub>3</sub>O<sub>4</sub>(001) increases in the order: tertiary alkyl < secondary alkyl < primary linear alkyl ≈ primary branched alkyl < aryl. This order is in agreement with experimental observations for the thermal stability of antiwear additives with similar substituents. The results highlight surface and substituent effects on the thermal decomposition of phosphate esters which should be helpful for the design of new molecules with improved performance.</p>

scholarly journals Paint Film Formation Process in Spray Coating

1986 ◽  
Vol 59 (12) ◽  
pp. 711-718 ◽  
Author(s):  
Kazuyuki TACHI ◽  
Chikaaki OKUDA ◽  
Yoichi OYAMA ◽  
Shouichi SUZUKI
Keyword(s):  
Formation Process ◽  
Film Formation ◽  
Paint Film ◽  
Spray Coating

Development of Resistant Coating Systems Based on Polymer Binders

2014 ◽  
Vol 897 ◽  
pp. 262-265
Author(s):  
Michael Tupý ◽  
Vít Petranek ◽  
Jana Kosíková
Keyword(s):  
Polymer Coating ◽  
Chemical Resistance ◽  
Water Solution ◽  
Coating Materials ◽  
Polymer Binders ◽  
Physical Composition ◽  
Common Substrate ◽  
The Common ◽  
Secondary Materials ◽  
Glass Packaging

The aim of the work was to propose the application for waste secondary materials as filler in polymer coating systems. Authors decided to use two different water-based epoxide binders: Lena N141 and Lena N 121 and the waste suitable materials were chosen by its chemical and physical composition and properties. Used recycled materials were glass of windscreen, glass beads, screen, glass packaging and fluorescent glass. The particle size and scanning of grain were determined. The chemical resistance and the adhesion of coating materials to the common substrate were also tested. The chemical resistance was tested with substances: distilled water, oil, petrol, acetone, 20% water solution of NaCl, 50 % water solution of ethanol, 5 % and 30 % water solution of NaOH a 20 % water solution of H2SO4.

scholarly journals The Formation of Sulfide Scales on Carbon Steel in Saturated H2S

2020 ◽  
Author(s):  
Noora Alqahtani ◽  
Jiahui Qi ◽  
Aboubakr M. Abdullah ◽  
Nicholas J. Laycock ◽  
Mary P. Ryan
Keyword(s):  
Carbon Steel ◽  
Corrosion Product ◽  
Film Formation ◽  
Open Circuit ◽  
Iron Surface ◽  
Ion Concentration ◽  
Bulk Solution ◽  
Formation Mechanisms ◽  
Structure Thickness ◽  
Circuit Technique

There are three contributing elements of corrosion of Carbon Steel in H₂ S environment: the effect of H2S on water chemistry; electrochemical reactions of the bare iron surface (both anodic and cathodic processes); and the formation and growth of corrosion product layers. The electrochemical reaction commonly contains three stages: first, the reactant transported from the solution (bulk) to the metal surface; then the transfer of the charge reaction on the surface, followed by the reaction product transported away from the iron surface to the bulk solution or the formation and development of the corrosion product which then can decrease the corrosion rate. Development of a robust corrosion model to predict the corrosion process in H2S requires a mechanistic understanding of all these elements. An experimental study was carried out to assess the corrosion of C-steel under open-circuit technique conditions and in solutions at several ranges of time and temperatures. The effect of film composition, morphology, structure, thickness, and ion- concentration of corrosion product films formed on pipeline Carbon Steel in an acid sour solution were examined. The electrochemical behavior of the filmed steel was measured, and the film properties assessed using a range of advanced techniques including Scanning Electron Microscopy (SEM), and Raman spectroscopy (RS). The data will be discussed in terms of film formation mechanisms.

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