Hydroxypropyl methylcellulose is not harmful to the human body, hydroxypropyl methyl cellulose is safe and non-toxic, can be used as a food additive, has no heat, and has no irritation on skin and mucous membrane contact. Generally considered to be a safe daily allowable intake of 25mg / kg, protective equipment should be worn during operation.
Breastfeeding women lactate while using the drug, and no adverse reactions have been reported in infants. Therefore, there are no special contraindications for pregnant and lactating women. The use of hypromellose in children does not cause more adverse reactions compared with other age groups, so children can use this product in the same scheme as adults.
Characteristics of hydroxypropyl methylcellulose
1. The higher the degree of polymerization of cellulose ether, the larger its molecular weight, and the higher the viscosity of the aqueous solution.
2. The higher the intake (or concentration) of cellulose ether, the higher the viscosity of its aqueous solution. However, pay attention to selecting a suitable intake during application to avoid excessive intake and affect the work of mortar and concrete. characteristic.
3. As with most liquids, the viscosity of the cellulose ether solution will decrease with increasing temperature, and the higher the concentration of cellulose ether, the greater the effect of temperature.
4. Hydroxypropyl methylcellulose solution is usually a pseudoplastic body, which has the property of shear thinning. The greater the shear rate during the test, the lower the viscosity. Therefore, the cohesiveness of the mortar will decrease due to the external force, which is conducive to the scraping construction of the mortar, resulting in the mortar having both good workability and cohesiveness.
The hydroxypropyl methylcellulose solution exhibits Newtonian fluid characteristics when the concentration is very low and the viscosity is small. When the concentration is increased, the solution gradually exhibits pseudoplastic fluid characteristics, and the higher the concentration, the more obvious the pseudoplasticity.
Post time: Mar-11-2020