Browsing by Author "Satharasinghe, WNN"

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item: Conference-Full-text
Locally producible castor-oil based surfactant for production of nr-latex foam
(Engineering Research Unit, Faculty of Engiennring, University of Moratuwa, 1995-03) Subramaniam, K; Satharasinghe, WNN; Dias, WPS
A surfactant plays an important role in a colloidal system such as natural(NR) latex. It decreases the surface free energy at the interface between the rubber particle and aqueous phase, thereby enhancing the stability of the latex. Of all the surfactants that are applicable in NR-latex'.the anionic types of unsaturated long chain molecules have been, found to be most suitable for the production of NR-latex foam.typically the organic compound K-oleate. Although locally producible K-soap of castor oil has been identified as an alternate surfactant to K-oleate,no detailed studies have been made on its performance in NR-latex,in relation to that of K-oleate. It is with this-concern that-this paper is presented. In this work,the K-soap of castor oil has been prepared and then compared with K-oleate for’siirfattive; performance,especially for stabilising and form promoting effects in NR-latex. The investigation of the results of the studies reveals that in respect of these effects K-soap of castor oif functions more effectively than K-oleate.
item: Thesis-Abstract
Use of some castor oil derivatives as surfactants in NR latex industry
(2014-07-07) Satharasinghe, WNN; Subramaniam, K
Surfactants which find applications in local NR latex industry are chiefly imported chemicals. With a view to replace some of these chemicals with locally producible materials, in this study, castor oil extracted in this country was converted chemically into its derivatives - castor soap (potassium ricino-leafee) and sulphated castor oil. The effects of addition of each derivative on the stability and foaming behaviour of NR latex and on emulsification of a liquid softener (paraffin oil) were investigated. Further, the derivative, sulphated castor oil was also tested for its suitability as a dispersing agent in the preparation of an accelerator (ZMBT) dispersion. To assess the performanc-es of these derivatives in the above determinations, parallel tests were also carried out using potassium oleate in the first two tests and Dispersol LN (sodium salt of naphthalene formaldehyde sulphonate ) in the third test.