The viscosity properties and application fields of low-viscosity hydroxypropyl methylcellulose Hydroxypropyl methylcellulose HPMC is a white to slightly yellow powder or granular substance, odorless, odorless, and non-toxic.
According to the viscosity size, it can be divided into low viscosity and high viscosity.
Scosity is one of the intrinsic properties of polymer materials and is formed by the resistance of intermolecular interaction of liquid during flow
Scocosity behavior refers to the change and adaptability of solution viscosity with environmental conditions.
This is significantly different from the general natural polymer materials (such as starch) that form gels under cooling conditions.
During the process of hydrogel change, the viscosity of hydroxypropyl methylcellulose solution changes greatly.
Viscosity behavior is influenced by multiple factors. 1. Materials and Methods
1.1 Main raw materials and equipment hydroxypropyl methyl cellulose, low viscosity.
1.2 Test scheme mainly examines the quality score, temperature, pH, procoagulant, salt mass and other hydroxypropyl methyl red Effects of viscosity of Vin solution.
The mass fraction of hydroxypropyl methylcellulose is designed to be 1%~8%;
the temperature change range is 20~60℃: pH is 2~12: the knot jelly mass fraction is 010% -0 ~ 0.40%; the salt mass fraction is 0.1%~0.9%。
1.3 Test method 131 Preparation of hydroxylmethylcellulose solution.
Heat a certain amount of deionized water to 70~75℃, and dissolve a certain amount of raw material according to the test scheme.
Cellulose dissolution should be performed on a magnetic heating mixer with a stirring speed of 300 r/min, dissolved for 10 min, stand still to eliminate air bubbles, cool to room temperature, and set up.
1.4 Determination of the viscosity of hydroxypropyl methylcellulose solution.
2. Results and analysis
2.1 The effect of the hydroxymethylmethyl cellulose mass fraction on the solution viscosity, which has a direct effect on the solution viscosity.
The viscosity change trend was increased with the increase of the hydroxypropyl methylcellulose mass fraction.
With the increase of hydroxypropyl methylcellulose concentration, the intermolecular friction force, interaction and arrest force increase, and the fluidity decreases.
From the curve analysis, the viscosity and the mass fraction change exponentially