Thickening and thixotropy of hydroxypropyl methyl cellulose


The second action of the hydroxypropyl methylcellulose-thickening effect depends on hydroxypropyl methylcellulose polymerization degree, solution concentration, shear rate, temperature and other conditions. The gelation properties of solutions are unique to alkyl cellulose and its modified derivatives. Gelation characteristics are related to the degree of substitution, solution concentration and additive. For hydroxyl-alkyl-modified products, gel properties are also associated with the degree of hydroxyl-alkyl modification. For the solution concentration of low viscosity MC and HPMC can be prepared 10%-15% concentration solution, medium viscosity MC and HPMC can be designed 5%-10% solution and high viscosity MC and HPMC can only prepare 2%-3% solution, and usually the viscosity of hydroxypropyl methylcellulose is also graded with 1%-2% solution. High molecular weight hydroxypropyl methylcellulose thickening efficiency is high, the same concentration of explanation, different molecular weight polymers have different viscosity, between the density and molecular weight can be expressed as follows, [η]=2.92×10-2 (DPn) 0.905, DPn is the average degree of polymerization high. Low molecular weight hydroxypropyl methylcellulose adds more to achieve the target viscosity. Its viscosity has little dependence on shear rate, high density can reach the target viscosity, and the amount of addition is less. The thickening efficiency determines the size of the thickness. So to achieve sure consistency, hydroxypropyl methylcellulose must have a certain amount of expansion (solution concentration) and solution viscosity. The gel temperature of the solution also decreases linearly with the increase of the attention of the resolution and gels at room temperature after reaching a specific concentration. HPMC gel concentration is higher at room temperature. If you are looking for high quality, high purity and cost-effective Hydroxypropyl methylcellulose, or if you require the latest price of Hydroxypropyl methylcellulose, please feel free to email contact mis-asia.

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