Low-viscosity hydroxypropyl methyl cellulose HPMC has good water solubility, high transparency, good gel properties, strong fluidity, and surface activity. It is widely used in medicine and food, petrochemical, construction, textile and electronics industries. Industrial products such as films prepared from cellulose ether have high mechanical strength, flexibility, heat resistance and cold resistance, and have good compatibility with various resins and plasticizers, making them a good coating material .
However, the low-viscosity hydroxypropyl methylcellulose aqueous solution has a thermal gel behavior, which is soluble in cold water, and can form a gel when heated, and then dissolve again after cooling. This is significantly different from the general natural polymer materials (such as starch) that form gels under cooling conditions. In the process of thermal gel change, the viscosity of the hydroxypropyl methyl cellulose solution changes greatly.
Viscosity behavior is affected by many factors. The author investigated the law of the viscosity change of low-viscosity hydroxypropyl methylcellulose under the changing conditions of temperature, pH, concentration, tackifier, salt, etc., in order to provide reference for using its viscosity characteristics to serve the production field.