How to Use CELLOSIZE™
Hydroxyethylcellulose polymers are hygroscopic powders that will agglomerate and clump when exposed to water if they are not dispersed properly. This can lead to lumpy inconsistent solutions. In order to prevent this CELLOSIZE™ polymers are crosslinked to delay hydration and allow for proper dispersion. The procedure outlined below is recommended for producing stable homogeneous solutions of CELLOSIZE™.
- CELLOSIZE™ should be added under agitation to a solution of pH 7.0 or less
- Allow CELLOSIZE™ to be thoroughly dispersed in the solution
- Once dispersion is achieved the hydration can be accelerated by adjusting the pH to the alkaline range or by increasing the temperature.
- Once hydration is complete and the target viscosity is achieved the solution can be adjusted to a pH between pH 2-12 without any significant effect on viscosity
Selecting a Grade of CELLOSIZE™
CELLOSIZE™ hydroxyethylcellulose polymers range in molecular weight and should be selected based on the desired viscosity and the flow properties of the solution. The Brookfield viscosity of various CELLOSIZE™ grades at 2% in water are listed below.
The concentration of CELLOSIZE™ can be adjusted to meet exact viscosity requirements of a formulation. In addition, the same target viscosity can be reached using different concentrations of various grades.For example, a one percent solution of QP-30000H and a three percent solution of QP-300 both provide a viscosity of 1500 cP, however, the flow properties of the solutions are dramatically different. In general, solutions of large molecular weight grades of CELLOSIZE™ produce solutions with a more pseudoplastic rheology.