The effect of hydrophobically modified inulin on the properties of natural rubber latex concentrates

Manroshan S., . and Amir Hashim M. Y., . and Booten K., . The effect of hydrophobically modified inulin on the properties of natural rubber latex concentrates. pp. 156-165. ISSN 1511-1768

Natural rubber (NR) latex is a dispersion of rubber particles in an aqueous phase. By virtue of the naturally occurring surface active materials surrounding each particle the rubber particles are therefore prevented from coalescing together. However microbe activities in non-preserved latex may destroy the surface active properties of these natural materials. Hence NR latex is typically preserved with ammonia to maintain its alkalinity of pH 10 and above. In this study a biobased surfactant was added to the deammoniated natural rubber latex concentrate to enhance the stability of the latex. The hydrophobically modified polyfructose (Inutec SP1) thought to be similar to some of the naturally occurring surfactants on the rubber was incorporated into the latex at different ratios and its effect on some of the important properties of the latex were investigated. The addition of 0.25 p.h.r. of the surfactant increased the mechanical stability time (MST) of the latex concentrates by 500 s. Up to six weeks of storage not much change was observed in the viscosity although the volatile fatty acid number (VFA No.) of the concentrates increased slightly. However as the pH reduced further below 10 the effectiveness of the surfactant decreased. The MST reduced whereas the VFA No. and viscosity of the latex concentrates increased.

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Abstract

Natural rubber (NR) latex is a dispersion of rubber particles in an aqueous phase. By virtue of the naturally occurring surface active materials surrounding each particle the rubber particles are therefore prevented from coalescing together. However microbe activities in non-preserved latex may destroy the surface active properties of these natural materials. Hence NR latex is typically preserved with ammonia to maintain its alkalinity of pH 10 and above. In this study a biobased surfactant was added to the deammoniated natural rubber latex concentrate to enhance the stability of the latex. The hydrophobically modified polyfructose (Inutec SP1) thought to be similar to some of the naturally occurring surfactants on the rubber was incorporated into the latex at different ratios and its effect on some of the important properties of the latex were investigated. The addition of 0.25 p.h.r. of the surfactant increased the mechanical stability time (MST) of the latex concentrates by 500 s. Up to six weeks of storage not much change was observed in the viscosity although the volatile fatty acid number (VFA No.) of the concentrates increased slightly. However as the pH reduced further below 10 the effectiveness of the surfactant decreased. The MST reduced whereas the VFA No. and viscosity of the latex concentrates increased.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Latex
AGROVOC Term:	Hydrophobicity
AGROVOC Term:	Inulin
AGROVOC Term:	Surfactants
AGROVOC Term:	Volatile fatty acids
AGROVOC Term:	Preservation
AGROVOC Term:	Polymers
AGROVOC Term:	Rubber crops
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:10
URI:	http://webagris.upm.edu.my/id/eprint/23081

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