Rodys R is an aqueous solution of sodium salt of naphthalene sulfonic acid formaldehyde (NSF) polycondensates with a dry substance content of 40%, and a low content of calcium and iron ions. The production technology of Rodys R allows obtaining a product that neither has an environmental classification, nor does it contribute to increase of the concentration of polycyclic aromatic hydrocarbons in finished products. As a dispersant, it is especially dedicated to emulsion polymerization of styrene-butadiene rubber (SBR), and can be an alternative to Rodys K.
Rodys R is a surfactant in which the hydrophobic group is an organic chain, and the sulfone groups form a hydrophilic part. This structure implies its dispersing properties. Polycondensate, adsorbing onto solid particles, forms a layer on them of unipolar electrical charges. Their mutual repulsion causes both the disintegration of agglomerates of these particles, and even dispersion in the water continuous phase of the system.
Rodys R was designed for the needs of the rubber industry, and its main application is in the emulsion polymerization process of styrene and butadiene leading to the production of styrene-butadiene rubber (SBR). The chemical structure and physicochemical parameters of this polymer favour the formation of colloidal systems in the liquid phase, creating time-stable dispersion. The product is compatible with other additives used in the process.
Rodys R used in a small amount causes a very good dispersion of latex particles formed in the production process, in the aqueous phase. This prevents the formation of its coagulates during both polymerization and degasification. It also does not adversely affect the physicochemical (e.g. Mooney viscosity, polydispersity, vitrification temperature) and mechanical (tensile strength, elongation at break) properties of the obtained styrene-butadiene rubber, or the speed of the polymerization reaction. An additional advantage of using Rodys R is saving time spent on cleaning the production system due to the very low concentration of latex coagulates.
The main application of R-Dispersant is emulsion polymerization of styrene with butadiene. Still, it can also be used in emulsion polymerization processes of other types of rubbers, as well as various types of aqueous suspensions.