Comparison of Smectite Clays in Underarm Products - Elementis ...

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Viscosity Pa.s Viscosity and Yield Value of Hectorite vs Bentonite in Water Hectorite and Bentonite were compared at various concentrations in water. The results are shown in Figure 6. The smaller particle size of Hectorite clay means that there are a greater number of particles and it has a larger surface area per gram. As we would expect, due to the smaller particle size, the viscosity profile for Hectorite clay in water shows it to be much more efficient than Bentonite clay. In fact, to get the same viscosity as Hectorite, approximately twice as much Bentonite must be used. In Figure 7 we can see that the yield value for Hectorite is much higher than the yield value of Bentonite. In antiperspirant roll-ons and emulsions the higher viscosity of Hectorite means that smaller amounts of Hectorite are needed than Bentonite to achieve the same viscosity and rheological performance. The higher yield value means that Hectorite is better at preventing the settling of suspended particles in formulations than Bentonite. 180 160 140 120 100 80 60 40 20 0 2 3 Hectorite Bentonite 4 5 6 7 8 9 10 % Concentration Figure 6. Viscosity vs concentration of Hectorite and Bentonite in aqueous solution Viscosity Pa.s 1000000 100000 10000 1000 100 10 1 0.1 Yield Point = 0 Pa 0.01 10 100 Shear Stress Bentonite Yield Point = 84.02 Pa Hectorite Figure 7. Yield values of 5% Hectorite and Bentonite in aqueous solution Pa 5 1000
Viscosity Pa.s Viscosity and Yield Value Hectorite vs Bentonite Organoclays in Cyclopentasiloxane Hectorite and Bentonite organoclay (Disteardimonium Hectorite or Disteadimonium Bentonite) were compared at various concentrations in Cyclopentasiloxane. The results are shown in Figure 8. The viscosity profile for Hectorite organoclay in Cyclopentasiloxane shows it to be much more efficient than Bentonite organoclay. In Figure 9 we can see that the yield value for Hectorite organoclay is higher than that of Bentonite organoclay. In anhydrous antiperspirants the higher viscosity and yield value provided by Disteardimonium Hectorite offer a potential cost saving advantage because less organoclay is required to achieve the required suspension stability of Aluminium salts. 100 90 80 70 60 50 40 30 20 10 0 0 2 4 Hectorite Bentonite 6 8 10 12 14 16 18 % Concentration Figure 8 Viscosity vs concentration of Hectorite and Bentonite organoclay in Cyclopentasiloxane 20 100000000 Viscosity Pa.s 10000000 1000000 100000 10000 1000 100 10 1 Yield Point = 334.58 Pa 0.1 10 100 Shear Stress Bentonite Yield Point = 536.22 Pa Pa 1000 Hectorite Figure 9. Yield values of 18% Hectorite and Bentonite organoclay in Cyclopentasiloxane 6 10000
Page 2 and 3: Introduction The functionality of s
Page 4 and 5: Morphology of Hectorite and Bentoni
Page 8 and 9: Suspension of Particles in Antipers
Page 10 and 11: Low Staining Potential of Hectorite
Page 12 and 13: ∆E CIE L*a*b* Measurements of Hec
Page 14 and 15: ∆E CIE L*a*b* Measurements of Cla
Page 16: References: 1. Clarke, M. T., in 'R

Comparison of Smectite Clays in Underarm Products - Elementis ...

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