Investigation of the Performance of ATH Powders in Organic Powder Coatings

Li, Weihong; Franco, Diego Cárdenas; Yang, Marshall Shuai; Zhu, Xinping; Zhang, Haiping; Shao, Yuanyuan; Zhang, Hui; Zhu, Jesse

doi:10.3390/coatings9020110

Cited by 9 publications

(8 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results showed that, the hardness values of the coating slightly increased with the addition of ATH (Table 1). It was reported that the incorporation of ATH into coatings resulted in an increase of the hardness value of the coating [31]. It is expected that, the addition of a filler into a UV curable PUA resin would result in a lower photopolymerization due to the screen effect of particles, reducing the penetration of UV light [32,33], which in turn may reduce the hardness value of the film.…”

Section: Hardness Analysismentioning

confidence: 99%

Enhancing the Flame Retardancy of UV Curable Polyurethane Acrylate Coated Films with Alumina Trihydrate Filling

Kalav

İşmar

Kayaoğlu

2019

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

In this study, the flame retardancy of ultra violet (UV) curable polyurethane acrylate (PU) coated films were enhanced. For this aim, alumina trihydrate (ATH) filling material was mixed with the pastes including a photoinitiator and a UV curable PU. ATH filling ratio was preciously adjusted to obtain a uniform coating. The coated films were cured with a UV curing system equipped with gallium (Ga) and mercury (Hg) lamps. The chemical changes and the curing degree of the UV cured films were examined by a Fourier Transform Infrared Spectrum (FTIR) and a pendulum hardness tester. The thermal properties of the UV cured films were evaluated using a Differential Scanning Calorimeter (DSC). Moreover, vertical flammability and limiting oxygen index (LOI) measurements were conducted in order to determine the burning behavior of the UV cured films. The successful curing of the films was evidenced by means of FTIR results. The addition of ATH slightly increased the hardness values of the films. DSC results showed that ATH addition not only increased the enthalpy values but also enhanced the flame retardant property of the coated films and maximum LOI was achieved as 31.5%.

show abstract

Section: Hardness Analysismentioning

confidence: 99%

Enhancing the Flame Retardancy of UV Curable Polyurethane Acrylate Coated Films with Alumina Trihydrate Filling

Kalav

İşmar

Kayaoğlu

2019

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

show abstract

“…Other thermosetting coating components, such as pigments [18,25] and fillers [26,27], can also influence the coating performance [5]. The addition of fillers (also called extenders) into powder coating is common in the industry.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Anti-Corrosive Performance of Zinc Phosphate in Powder Coatings

et al. 2022

Self Cite

View full text Add to dashboard Cite

Powder coatings are gaining popularity for their economic and environmental benefits. Additives (pigments) such as zinc phosphate enhance the anti-corrosive properties of coatings, but their behavior in powder coatings has not been extensively studied. In this study, zinc phosphate was incorporated into three powder coating systems: polyester clearcoat, polyester and epoxy coatings with filler BaSO4. Neutral salt spray and electrochemical tests (OCP, LPR, and EIS) confirmed that the anti-corrosive performance improved with the addition of zinc phosphate. The optimal additive dosage was determined to be 2% for all of the coating systems studied here, based on salt spray tests. Here, the time until failure increased by 1.5 to 2 times. Using electrochemical tests, an optimal additive dosage of 8% was found for the polyester clearcoat, while the other coating systems maintained an optimal additive dosage of 2%. Performance increased by as much as one order of magnitude based on resistance/impedance measurements. This suggested a synergistic effect between the additive and the filler. The passivation layer was confirmed by both X-ray diffraction and Raman spectroscopy. Based on the results and discussion presented in this article, the discrepancy was caused by different features of the two tests, such that the electrochemical tests probe the function of intact coatings, whereas salt spray measures only the corrosion spreading from the scribe. It is proposed that the two test methods characterize different aspects of the coatings, corresponding to their service conditions. This has theoretical and practical significance in the evaluation of anti-corrosive coatings. Other properties of the coatings, including adhesion, gloss, distinctness-of-image, and pencil hardness, were measured as per applicable standards and the conformance was verified.

show abstract

“…Alumina (Al 2 O 3 ) and its partial hydrates prove to be extremely valuable materials in many practical applications, usually as desiccants [1][2][3], fillers [4][5][6], adsorbents [7][8][9][10] for the removal of oil and grease from industrial waters [11], organic powder coatings [12][13][14], porous ceramics [15][16][17], high-temperature ceramic oxides [18][19][20], ceramic filtration membranes [21][22][23][24], and catalysts [25][26][27][28][29], only if the precursors are properly prepared and thermally treated [30][31][32]. Among the desired properties for these applications are a specific pore size and pore size distribution [33,34], a high specific surface area [35][36][37], and the degree of crystallinity, which also plays an essential role [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Al(OH)3 Part II—Effect of Different Thermal Treatments

Vasile

Dobra²,

Iliev

et al. 2021

Ceramics

View full text Add to dashboard Cite

In this paper, the thermal decomposition of crystalline Al(OH)3 was studied over the temperature range of 260–400 °C for particles with a size between 10 and 150 µm. The weight losses and thermal effects occurring in each of the dehydration process were assessed using thermogravimetry (TG) and differential scanning calorimetry (DSC) thermal analysis. X-ray diffraction (XRD) patterns, refined by the Rietveld method, were used for mineral phase identification, phase composition analysis, and crystallinity degree determination. Moreover, the particle size distributions and their corresponding D10, D50, and D90 numeric values were determined with a laser analyzer. We observed a strong relationship between the calcination temperature, the initial gibbsite grade particle size, and the crystallinity of the resulting powders. Hence, for all endothermic effects identified by DSC, the associated temperature values significantly decreased insofar as the particle dimensions decreased. When the gibbsite was calcined at a low temperature, we identified small amounts of boehmite phase along with amorphous new phases and unconverted gibbsite, while the powders calcined at 400 °C gradually yielded a mixture of boehmite and crystalized γ-Al2O3. The crystallinity % of all phase transition products declined with the increase in particle size or temperature for all the samples.

show abstract

Investigation of the Performance of ATH Powders in Organic Powder Coatings

Cited by 9 publications

References 19 publications

Enhancing the Flame Retardancy of UV Curable Polyurethane Acrylate Coated Films with Alumina Trihydrate Filling

Enhancing the Flame Retardancy of UV Curable Polyurethane Acrylate Coated Films with Alumina Trihydrate Filling

A Comparative Study on the Anti-Corrosive Performance of Zinc Phosphate in Powder Coatings

Thermally Activated Al(OH)3 Part II—Effect of Different Thermal Treatments

Contact Info

Product

Resources

About