Preparation of urea formaldehyde resin/layered silicate nanocomposites

Abstract

Purpose -The purpose of the research was as follows. In situ modified urea formaldehyde resins were prepared from clay (montmorillonite) and organoclay in the presence of base catalyst. Different clay contents (1 wt%, 3 wt%, 6 wt%) were used to produce clay modified nanocomposite resins. These nanocomposites were characterized with FT-IR, XRD as structural analysis and DSC as thermal analysis and their hardness was evaluated as mechanical analysis. The thermal results was compatible with hardness measurements and showed that using clay/organoclay added resin as a surface coating material provides significant improvement. Design/methodology/approach -During synthesis of the resin, modification was carried out using urea/formaldehyde with molar ratio of 1/1.6, under basic medium with pH ¼ 10 and with temperature of 708C by loading pristine and organomodified layered silicates. Findings -X-ray diffraction (XRD) results indicate that the interlayer space of pristine clay was increased significantly by one step, seeing that one step processes are crucial for industrial applications.Research limitations/implications -The reaction mixture must be stirred continuously. Temperature should be controlled in order to prevent the thermal curing of urea formaldehyde resin.Practical implications -This study provides technical information for the synthesis of nanocomposite resins. The clay or organoclay modified resins may also promote the adhesive strength of coating and also inhibit corrosion effects to metal surfaces of the coated area. Social implications -This resin will be used for the coating material. Originality/value -As T g -T m region of some nanocomposites is enhanced, and by assessing the results of hardness measurements, it is concluded that these samples have further improved mechanical properties as a coating material than urea formaldehyde resin has.

Effect of a novel environmentally friendly additive of polyaspartic acid on the properties of urea formaldehyde resins/montmorillonite

“…The bands at 525 and 466 cm −1 are attributed to the stretching vibrations of SiOAl and bending vibrations, respectively . According to Figure (e), the absorption band at approximately 3348 cm −1 is associated with NH stretching vibrations, the band at around 2964 cm −1 is ascribed to the CH stretching vibrations, and the strong band at 1640 cm −1 is assigned to the CO stretching vibration in NHCO group . The band at 1550 cm −1 is attributed to the NH bending vibrations.…”

Effects of adding nano-clay (montmorillonite) on performance of polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives in Carapa guianensis, a tropical species

“…Organo-clays derived from natural montmorillonite and modified with quaternary ammonium salt (dimethyl benzyl hydrogenated tallow ammonium) have been shown to improve the properties of polyvinyl acetate [2,[7][8][9] and urea-formaldehyde adhesives [10][11][12][13]. However, the effect of nanoparticle incorporation on the performance of adhesives used with tropical wood is still unknown.…”

Effect of nanoclay-treated UF resin on the physical and mechanical properties of plywood manufactured with wood from tropical fast growth plantations

“…The addition of nanoclay to various types of adhesive has been shown to improve mechanical properties at the glue line (Lei et al 2008, Kaboorani and Riedl 2011, Kaboorani et al 2012, Kaboorani et al 2013, Pique et al 2013, Pirayesh et al 2013, Xian et al 2013, Ates et al 2013. A similar result was obtained in Moya et al (2015b), wherein shear strength at the glue line of Carapa guianensis hardwood was improved by using nanoclay-modified UF resin.…”

“…Universidad del B í o -B í o Maderas. Ciencia y tecnología 20(1): 11 -24, 2018 Developments in nanotechnology, specifically the use of nanoparticles, have led to improvements of the properties of adhesives and the resistance at the glue line between the lumber and adhesive (Cai et al 2007, Lei et al 2008, Ashori and Nourbakhsh 2009, Kaboorani et al 2011, Ates et al 2013, Xian et al 2013, Bardak et al 2017. However, behaviour of nano-modified adhesives in tropical species is, as of yet, not well known (Moya et al 2015a, Moya et al 2015b.…”