Viscosity of latex mixes using a full two-level factorial design

Lai P. F., . Viscosity of latex mixes using a full two-level factorial design. pp. 257-266. ISSN 0127-7065

Good viscosity stability of latex compounds is important for production processes. The effect of additions of potassium laurate zinc oxide and ammonium sulphate on the viscosity of a natural rubber latex concentrate were investigated using a full two-level factorial design. The main and interaction effects were found to be large and significant as calculated by Yates Algorithm. Thus all three variables jointly influenced the viscosity stability of latex compounds. When potassium laurate and ammonium sulphate were at the 1 levels (he increases in viscosity of the latex compounds were found to be large and gelation took place on overnight maturation. The destabilising effect of the laurate has been interpreted based on the results of radiotracer investigations on l4C-laurate soap adsorption on latex particles which showed appreciable surface protein displacement by the added soap at high soap concentrations. A similar interpretation is made - albeit less conclusively - when the nitrogen values of the cream fraction of latex which was treated with high laurate concentrations were examined. Further the destabilising influence of ammonium sulphate on latex compounds is discussed together with some data showing the relationship between ammonia/ammonium concentrations and zinc oxide solubility as measured by a 65Zn-radiotracer method.

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Abstract

Good viscosity stability of latex compounds is important for production processes. The effect of additions of potassium laurate zinc oxide and ammonium sulphate on the viscosity of a natural rubber latex concentrate were investigated using a full two-level factorial design. The main and interaction effects were found to be large and significant as calculated by Yates Algorithm. Thus all three variables jointly influenced the viscosity stability of latex compounds. When potassium laurate and ammonium sulphate were at the 1 levels (he increases in viscosity of the latex compounds were found to be large and gelation took place on overnight maturation. The destabilising effect of the laurate has been interpreted based on the results of radiotracer investigations on l4C-laurate soap adsorption on latex particles which showed appreciable surface protein displacement by the added soap at high soap concentrations. A similar interpretation is made - albeit less conclusively - when the nitrogen values of the cream fraction of latex which was treated with high laurate concentrations were examined. Further the destabilising influence of ammonium sulphate on latex compounds is discussed together with some data showing the relationship between ammonia/ammonium concentrations and zinc oxide solubility as measured by a 65Zn-radiotracer method.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Hevea rubber
AGROVOC Term:	Latex
AGROVOC Term:	Factorial analysis
AGROVOC Term:	Potassium chloride
AGROVOC Term:	Ammonium sulphate
AGROVOC Term:	Nitrogen content
AGROVOC Term:	Atomic absorption spectrometry
AGROVOC Term:	Viscosity
AGROVOC Term:	Stability
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 04:43
URI:	http://webagris.upm.edu.my/id/eprint/23490

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