Development of sustainable resource based poly(urethane-etheramide)/Fe2O3 nanocomposite as anticorrosive coating materials (original) (raw)
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Vegetable oil based eco-friendly coating materials: A review article
Arabian Journal of Chemistry, 2014
Vegetable oils (VO) constitute the single, largest, easily available, low cost, non-toxic, non-depletable, biodegradable family yielding materials that are capable of competing with fossil fuel derived petro-based products. The outstanding feature of VO is their unique chemical structure with to unsaturation sites, epoxies, hydroxyls, esters and other functional groups along with inherent fluidity characteristics. These enable them to undergo various chemical transformations producing low molecular weight polymeric materials with versatile applications, particularly as chief ingredients in paints and coatings. In this manuscript, we have briefly described important VO derived materials such as alkyds, polyesteramides, polyetheramides, polyurethanes, epoxies, polyols, along with their preparation and applications as protective coatings. A small portion of the review is also dedicated to the future perspectives in the field. Inspite of their extensive utilization in the world of coatings, literature survey revealed that in the past (from 1990s to date) no review has come up describing the chemistry and applications of VO polymer based coating materials. Crown
Vegetable oil based eco-friendly coating materials: A review
2013
Vegetable oils (VO) constitute the single, largest, easily available, low cost, non-toxic, non-depletable, biodegradable family yielding materials that are capable of competing with fossil fuel derived petro-based products. The outstanding feature of VO is their unique chemical structure with to unsaturation sites, epoxies, hydroxyls, esters and other functional groups along with inherent fluidity characteristics. These enable them to undergo various chemical transformations producing low molecular weight polymeric materials with versatile applications, particularly as chief ingredients in paints and coatings. In this manuscript, we have briefly described important VO derived materials such as alkyds, polyesteramides, polyetheramides, polyurethanes, epoxies, polyols, along with their preparation and applications as protective coatings. A small portion of the review is also dedicated to the future perspectives in the field. Inspite of their extensive utilization
Industrial Crops and Products, 2014
Polyetheramide (CPETA) resin was synthesized from N,N-bis (2-hydroxy ethyl) corn oil fatty amide (HECFA) and catechol through condensation polymerization. CPETA was further cured with isophorone diisocyanate (IPDI) in different weight percentage (20, 25, 30, 35, 40 wt.%) to obtain poly(ether amide urethane) (CPETAU). The structural elucidation of HECFA, CPETA and CPETAU was carried out by FT-IR, 1 H NMR and 13 C NMR spectroscopic techniques. Physico-chemical and physico-mechanical properties of these resins were investigated by standard methods. Thermal behavior was assessed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The corrosion resistance performance of CPETAU coatings on mild steel strips was investigated by potentiodynamic polarization studies in different corrosive media (3.5 wt.% HCl, 5.0 wt.% NaCl, tap water) at room temperature. Amongst all the compositions, CPETAU coatings showed good scratch hardness (2.20 kg), impact resistance (150 lb/inch), gloss with corrosion rate obtained as 1.377 × 10 −2 (mm/year) and 2.359 × 10 −3 (mm/year) in 3.5 wt.% HCl and 5.0 wt.% NaCl solution, respectively. CPETAU coatings can be safely used up to 250 • C.
Progress in Organic Coatings, 2017
In the present study, preparation, characterization and coating properties of plant oils based organicinorganic hybrid materials [OIHM] are described. Polyols from Castor oil [CO], Linseed oil [LO] and tetraethoxyorthosilane [TEOS] serve as organic and inorganic constituents, respectively. OIHM are prepared by "hydrolysis-condensation" reactions. The hydroxyl groups of polyols condensed with TEOS, forming silica anchored polyol based OIHM which on addition reaction with isocyanate formed polyurethane hybrids [COHM-PU and LPOHM-PU]. In FTIR spectra of OIHM, absorption bands at 800 cm −1 (Si O Si sym str) and 1090.0 cm −1 (Si-O-Si assym str) confirmed the formation of nano silica, that occurred as unagglomerated and spherical particles as observed in TEM micrographs of OIHM. Thermogravimetric analysis showed the onset of degradation at 220 • C-225 • C. OIHM showed moderate to good antibacterial behavior against E.coli and S.aureus. OIHM coatings showed good corrosion rate and inhibition efficiency in 3.5 wt% NaOH, 3.5 wt% HCl and performed well in salt fog environment. The corrosion rate and IE% values for COHM-PU were found to be 1.534 × 10 −2 mm/yr and 94.208%, and 9.923 × 10 −3 mm/yr and 95.062% for LPOHM-PU, in 3.5 wt% NaOH for 0.5 mol loading of TEOS. In 3.5 wt% HCl, corrosion rate was 9.78 × 10 −3 mm/year for COHM-PU with IE% value as 91.90% and 7.98 × 10 −3 mm/year for LPOHM-PU with IE% value as 93.44%. OIHM were developed via a synergistic approach wherein plant polyols provide matrix for the production of SiO 2 ; the latter act as reinforcements improving the performance properties in hybrid polyurethane. OIHM may serve as platform chemicals for numerous industrial products such as paints and coatings.
Surfaces and Interfaces, 2019
Tung oil (TO) based polyol was synthesized through hydroxylation and alcoholysis. Modification of synthesized polyol (purified alcoholysed hydroxylated tung oil (PAHTO)) was carried out using the definite proportion of phthalic anhydride (PA), maleic anhydride (MA) and boric acid (BA) acting as modifiers as well as cross-linkers. Modified polyurethane (PU) was prepared by reacting the modified polyol with toluene diisocyanate (TDI) in NCO/OH = 0.7 ratio. Spectroscopic studies of modified PU confirmed the modification process. Anti-corrosive properties of the modified PU on galvanized steel (GS) was found better than mild steel (MS) in aqueous (3.5 wt %) NaCl solution environment. The resultant surface hydrophobicity and roughness characterization along with its morphology were analyzed using the atomic force microscopy (AFM) and contact angle (CA). Chemical resistance properties, as well as the physical properties such as gloss, scratch hardness, adhesion and impact resistance, were evaluated using standard methods. It was observed that the cross-linking moiety in the backbone of the PU chain exhibits better physico-chemical properties compared to the unmodified PU. The thermal stability of modified PU coating was examined by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) which showed that thermal properties like decomposition and glass transition of the materials increase with PA and BA molar ratio. The potentiodynamic and electrochemical impedance spectroscopy (EIS) study inferred better corrosion resistance property of PU with the incorporation of PA and BA which prepare itself for several industrial and commercial applications.
Eco-friendly protective coatings based on poly(urethane sulfone amide) dispersions for carbon steel
Journal of Coatings Technology and Research, 2016
and T120PUA5), were formulated based on series of laboratory-synthesized poly(urethane cosulfone amide) copolymer dispersions (CPDs) as binders. The first four formulations were based on CPDs prepared by the copolymerization reaction of PU based on castor oil (CO) with aromatic polyamide sulfone (APAS) in four different concentrations (0%, 1%, 3%, and 5% solid to solid). The other four formulations were based on CPDs synthesized by the copolymerization reaction of PU based on transesterified CO with triethanolamine (CON) at different time intervals (30, 60, 90, and 120 min) with APAS at only one concentration. The effect of the degree of copolymerization and transesterification reactions on the physical, chemical, and mechanical properties of the formulated coatings was studied. The results showed that the copolymerization and transesterification reactions led to an increase in the density and viscosity of the coating formulations. Additionally, the hardness of the dried films increased with copolymerization and transesterification reactions. The transesterification reaction decreased the adhesion force of the coated films. The copolymerization process caused a decrease in the water uptake of the coated films. However, the transesterification reaction increased the water uptake. The prepared formulations were applied on carbon steel substrates to estimate their efficiency as ecofriendly protective coatings for steel. The weight loss of the coated steel panels decreased with an increase in the amount of the copolymerized APAS within the PU chains, while it increased with an increase in the transesterification time of the CON used in the preparation of the coated copolymers. From the corrosion test results, PUA5 and T30PUA5 showed the best anticorrosive performance as estimated from the degree of rusting, weight loss measurements, and failure at scribe.
ACS Applied Materials & Interfaces, 2018
Nanocomposite coatings with synergistic properties hold a potential in long-term corrosion protection for carbon steel. Polydiphenylamine (PDPA) and vanadium pentoxide (V 2 O 5) have rarely been used as a corrosion inhibitor. Moreover, oleo polyurethanes are always demanded in the field of anticorrosive coatings. In view of this, we have synthesized safflower oil polyurethane (SFPU) and their nanocomposites using V 2 O 5-enwrapped PDPA (V 2 O 5-PDPA) as nanofiller. Fourier-transform infrared spectroscopy, X-ray diffraction, nuclear magnetic resonance, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis were used to characterize the structural, morphological, and thermal properties of these coatings. Corrosion resistance performance of these coatings in 5 wt % NaCl solution was determined by electrochemical measurements and salt spray tests. These studies exhibited very low I corr (7.45 × 10 −11 A cm −2), high E corr (−0.04 V), impedance (1.69 × 10 11 Ω cm 2), and phase angle (84°) after the exposure of 30 days. An immersion test, in 1 M H 2 SO 4 solution for 24 h, was also performed to investigate the effect of oxidizing acid on the surface of coatings. These results revealed the superior anticorrosive activity of nanocomposite coatings compared to those of plain SFPU and other such reported systems. The superior anticorrosive property of the proposed nanocomposite coatings provides a new horizon in the development of highperformance anticorrosive coatings for various industries.
Open Chemistry
Jatropha oil [JO] based poly (esteramide-urethane) coatings embedded with fumed silica nanoparticles were prepared. JO was converted to N,N-bis(2-hydroxy ethyl) JO fatty amide (HEJA) and was further modified by a tetrafunctional carboxylic acid(trans 1,2 diaminocyclo-hexane-N,N,N’,N’,-tetraacetic acid) to form poly (diamino cyclohexane esteramide) (PDCEA). PDCEA was then treated with toluene 2,4-diisocynate and fumed silica to prepare poly(diamino cyclohexane urethane esteramide) (PUDCEA) nanocomposite. The formation of PDCEA and PUDCEA nanocomposites was confirmed by FTIR, 1H &13C NMR spectroscopic techniques. The thermal behavior and morphology of PUDCEA nanocomposite coatings were investigated by TGA/DTG, DSC, SEM, EDX spectroscopy. PUDCEA nanocomposites were applied on carbon steel and their coatings were produced at room temperature. The properties of these nanocomposite coatings were investigated by standard analytical methods. The PUDCEA-3 nanocomposite showed good anticorros...