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Drying time recorder, pendulum hardness (Persoz), mandrel bending, impact, pull-off and gloss retention test re- sults.
Source publication
In the present investigation, the effect of two different mineral nano clays and a synthetic nano layered silicate on the properties of a transparent polyurethane resin has been studied. Both high rotator Torusmill and high intensity ultrasonic deagglomerator are utilized for the dispersion process. Observations by means of the X-ray diffraction te...
Contexts in source publication
Context 1
... drying time recorder, pendulum hardness (Persoz), mandrel bending, Impact, Pull-off and gloss retention tests results are listed in Table 1. The initial gloss of all samples did not change noticeably unless for the 5 wt% sample of synthetic nano layered silicate. ...
Context 2
... 7 shows microscopic images of different sam- ples after 70 double rubs of abrasive which confirms the automatic scratch resistance test results. Some gloss re- tention results obtained from these samples are listed in Table 1. In addition, samples did not show noticeable difference in case of the chipping test at the applied thickness. ...
Context 3
... order to trace the adhesion behavior of coatings, digital Pull-off test was employed. Results are listed in Table 1. In comparison with control sample (blank poly- urethane), the 1 wt% nanothix filled sample and 3 wt% Cloisite ® 30B filled polyurethane showed adhesion im- provement. ...
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Citations
... The two prominent reflections at 10.2°and 19.7°were fingerprints of chitosan and were related to the hydrated and anhydrous crystal form of chitosan (Wan et al., 2003). The XRD characteristic reflections of Mt occurred at 2θ =~5°, 9.58°, 19.72°, and 35.17°and the corresponding d-spacing values were 16.5 Å, 8.6 Å, 4.5 Å, and 2.5 Å respectively (Behdad et al., 2013;Assaedi et al., 2015). A new reflection appeared below 5°and a broad reflection appeared at 24.39°due to pPDA in CS/pPDA composites (Fig. 1c). ...
Biodegradable hybrid composites Chitosan/para-phenylenediamine (CS/pPDA), montmorillonite/chitosan/para-phenylenediamine (Mt/CS/pPDA), chitosan/ortho-phenylenediamine (CS/oPDA) and montmorillonite/chitosan/ortho-phenylenediamine (Mt/CS/oPDA) clay polymer nanocomposites (CPN) were successfully synthesized. The CPN composites were confirmed by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), UV–Vis spectroscopy and photoluminescence (PL) measurements. The nonlinear optical properties (NLO) of CPN were studied by using Z-scan technique in the picosecond (ps) and femtosecond (fs) durations. Open aperture Z-scan studies revealed reverse saturable absorption (RSA) behavior, which gives nonlinear absorption and closed aperture data revealed nonlinear refraction in both time domains. Sign and magnitude of the third order nonlinearity were evaluated. Optical limiting characteristics of the systems for optical switching were examined. Hence, the new CPN can be used as optical limiters.
... Nano inorganic substances are below 100 nm in size and because it is under visible light range, in a low amount addition, transparency does not change. The thickness of nano-layered silicate is almost 1 nm; thus, it is expected that, if in low amount, loading transparency will not change (Ahmadi et al., 2013). ...
Purpose
mechanical and chemical properties of acrylic-melamine automotive clear coat in presence of different percentages of well dispersed nano-layered sodium montmorillonite (Na-MMT) silicate particles were investigated. For this purpose, prepared dry clear coat film samples were subjected to the entire standard test series, usually carried out in automotive coating industry.
Design/methodology/approach
Effects of adding different percentages of nano-layered silicate on mechanical and chemical properties of acrylic-melamine automotive clear coat were investigated. In order to increase the compatibility of nanoclays with polymer matrix of clear coat, the surface of nanoclays was modified by Benzalkonium chloride as a cationic surfactant. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used for characterization and comparison between clays before and after modification, and also after dispersion in coating. Prepared dry clear coat film samples subjected to the test series are usually carried out in automotive coating industry.
Findings
The results indicated that incorporation of 1wt% and 2wt% of nano-layered silicate caused desired improvement in chemical and physical properties of the acrylic-melamine clear coat. Increasing the percentage of nanoclay to over 2wt% caused damage in some properties such as hardness, cupping, and gloss.
Research limitations/implications
All materials and methods were used in this research are industrial grade. Therefore the introduced modified clear coat sample has the potential for the commercial production as an automotive clear coat.
Originality/value
As far as it was searched in the literatures, effects of adding nanoclay particles on mechanical and physical properties of different clear coats such as epoxy clear coat have been investigated in a few researches but in this researchs the common and special tests which are necessary in automotive coating industry, have been ignored. In the present study for the first time acrylic-melamine clear coat was subjected to the modification with nano-clay and also most common industrial test methods were used for investigation of mechanical and chemical properties.
