Development of amino resins for emulsion paint formulation: effect of aldelhydic group and degree of substitution

Abstract

In our continuous effort to develop a paint binder from amino resins, amino resins from different aldehydic groups were synthesized to produce urea, formaldehyde (UF), urea acetaldehyde (UA), urea proparaldehyde (UP) and urea butaldehyde (UB) at different degree of substitution (Mono -tetra). Some physical properties of these resins were evaluated. The viscosity, gel time, density and refractive index of the resins (except UB) were found to increase with increase in alkyl length of the aldehydic group while turbidity (except UF) increased with increase in alkyl length of the aldehydic group. On the other hand, melting point and moisture uptake decreases with increase in alkyl length of the aldehydic group. In the case of the degree of substitution the viscosity, turbidity, melting point and moisture uptake increases with increase in the degree of substitution while the gel time and refractive index were found to decrease with increase in the degree of substitution. However, an initial rise followed by a gradual fall was recorded for density for the different degree of substitution for all the resins. Samples for UF and UA with the exception of monoethylol urea were too hard brittle and has low water resistance while those of UP and UB resins were too soft and remained as semi solid in the cured state at room temperature (30 o C). This result indicates that these resins cannot be used alone as paint binder. However, monoethylol urea seems to have sieved itself out as a compromise candidate who is neither brittle nor too soft. A comparison of monoethylol urea with some physical properties of some convectional paint binders present it as a potential binder which may be used in the coating industry.

Технология Удаления Свободного Формальдегида Из Карбамидоформальдегидных Смол

“…Konstantin V. Lipin 1 , lipinkost@mail.ru Sergey V. Fedoseev 1 , sergey.fedoseev88@gmail.com Denis A. Kizyaev 2 , denis.kizyaev@yandex.ru The relevance of the study is caused by high danger of technogenic emission of formaldehyde into the environment. The main anthropogenic source of formaldehyde is the production of particle board, which uses urea-formaldehyde resins.…”

“…Их получают поликонденсацией карбамида и формальдегида. Кроме этого, КФ смолы применяют, как эмульсионные краски [2], конденсаторы в электрохимии [3,4], для получения нанопорошков [5] и сорбен-та для удаления загрязнений из сточных вод [6]. В последние годы КФ смолы часто находят применение в агрохимии [7,8].…”

Blocked melamine–urea–formaldehyde resins and their usage in agglomerated cork panels

“…Some works can be found in literature dealing with providing formaldehyde‐based resins with some flexibility. Strategies involve introduction of plasticizers, flexible chains, and thermoplastic fillers . In the current work a different approach is followed, based on the incorporation of compounds that act as chain growth blockers.…”

“…Strategies involve introduction of plasticizers, 5,6 flexible chains, 7-9 and thermoplastic fillers. [10][11][12][13] In the current work a different approach is followed, based on the incorporation of compounds that act as chain growth blockers. The purpose is to decrease the crosslinking density of the final cured resin, allowing for greater chain mobility and thus higher flexibility.…”

Studies on the Removal of Heavy Metals From Aqueous Solution Using Immobilized Typha Angustata L.

“…As the samples were undergoing agitation on the shaker, they were removed one after the other at a predetermined time interval ranging from 0.5 to 24 hours at 30 o C. The solutions were filtered and analyzed for the residual metal ions using AAS (Chamarthy et The effect of pH on the maximum sorption capacity of the metal ions studied were 4 for Cd2+, 6 for Pb2+, and 5 for Fe3+, Cr3+, and Zn2+. The pH of the sorption media is related to the metal sorption -mechanism of the surfaces from the water and reflected the nature of the physicochemical interaction of the ions in solution and nature of the sorption sites (Osemeahon et al, 2007). Therefore, it can be suggested that the differences in the pH optima for different metal mioents aclo uld probably be due to the different solution chemistry of the metal ion (Lee et al, 2009).…”