Effect of DMPA Content on Colloidal Stability of Jatropha Oil-based waterborne Polyurethane Dispersion

Abstract

Driven by the increase of oil price in the market as well as environmental concerns by the society, a renewable raw material such as vegetable oil becomes the alternative to produce bio-based polyol to replace non-renewable polyols in polyurethane production. The recent development of aqueous polyurethane dispersion proves that environmentally waterborne PUD offers an efficient alternative to the solvent-borne PUD for the application in ink, adhesives, and coatings. In this study, the jatropha oil has been successfully functionalized to polyol (JOL) by epoxidation and oxirane ring opening steps. Jatropha oil-based waterborne polyurethane (JPU) dispersions were produced by polymerizing the JOL with isophorone diisocyanate (IPDI) and dimethylolpropionic acid (DMPA). The colloidal stability of JPU dispersions was studied in terms of particle size and zeta potential. Varying DMPA content from 5.0-7.0 wt.% resulted in small average particle size of dispersion from 39.40 nm to 133.2 nm. High zeta potential obtained in a range of -52 mV to -65 mV indicates the particles in the dispersion are sufficiently separated and therefore stable. Eventually, the study provides an overview of vegetable oil-based waterborne polyurethane dispersion with good stability for surface coating application.

Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

“…In the meantime, a doublet band associated with the epoxy group (C-O-C) in the EJO was observed at 842 and 819 cm −1 , indicating that the Jatropha oil was successfully converted to epoxidized Jatropha oil. During the oxirane ring-opening, the doublet bands of the epoxy group disappeared and new absorption bands at 3425 cm −1 , corresponding to the stretching vibration of the OH group, were formed, indicating that JOL was produced [ 5 , 26 ]. No absorption band of the OH group vibration was found in the WBPU spectra, indicating that all isocyanate was completely reacted to WBPU production by the OH group of JOL, 1,6 HDO, and DMPA [ 22 ].…”

Eco-Friendly Castor Oil-Based Delivery System with Sustained Pesticide Release and Enhanced Retention

“…Overall, no precipitates were observed at the different storage temperatures evaluated. Furthermore, the absolute ζ potential values of samples stored at different temperatures were higher than 30 mV, indicating the excellent physical stability of these WPU-ACT emulsions. , …”

“…Furthermore, the absolute ζ potential values of samples stored at different temperatures were higher than 30 mV, indicating the excellent physical stability of these WPU-ACT emulsions. 46,47 ACT is a good alternative to conventional insecticides, displaying no resistance problems due to its chemical complexity and nontoxic nature to mammals, beneficial arthropods, and warm-blooded vertebrates. 48 Unfortunately, ACT has a rapid biodegradability, especially in regard to photothermal factors that would accelerate its decomposition, 17,49,50 which greatly limits its application ranges in the agricultural field.…”

Síntesis y caracterización de sistemas poliméricos compuestos a base de poliuretanos empleando recursos naturales y nanopartículas

“…Por el lado de los polioles, su síntesis a partir de biomasa y, en particular, de aceites vegetales, está ampliamente desarrollada, a punto tal de que existen ya en el mercado biopolioles de origen vegetal. En los últimos años se han empleado diversas estrategias de síntesis utilizando aceites vegetales, entre las que se cuentan las reacciones de hidrogenación (15), ozonólisis (16), hidroformilación (17), transesterificación (18), tioleno (19) y la epoxidación y posterior apertura de anillos oxirano (20). Esta última vía (esquematizada en la Figura 1.5) ha ganado notoriedad porque la epoxidación de aceites vegetales a escala industrial se lleva a cabo para su utilización dual como plastificante y estabilizante en la industria de los materiales termoplásticos (por ejemplo, PVC), por lo que su disponibilidad es alta, a la vez que su costo es relativamente bajo.…”

“…Con respecto a la relación entre equivalentes alcohol del poliol o los polioles y el DMPA, se trata de un parámetro que repercute directamente en la cantidad relativa de ácido carboxílico en la estructura polimérica, lo cual afecta a algunas propiedades de las dispersiones, como la estabilidad coloidal, el tamaño de partícula y la densidad de carga (20), así como a sus propiedades reológicas (94). Además, incide también sobre algunas propiedades de los materiales, como por ejemplo ocurre con las películas: se ha señalado que ocurre un efecto adverso sobre las propiedades mecánicas con la utilización de relativamente altos contenidos de DMPA, producto de una reducción de la cristalinidad (94), pero, por el contrario, también puede haber un aumento significativo del grado de hinchamiento (94,95), lo que podría ser relevante si se desea una capacidad liberación controlada o la degradación del material en medio acuoso.…”