How to detect the viscosity of hydroxypropylmethylcellulose?

Special hydroxypropylmethylcellulose for construction needs to avoid the infiltration of moisture into the wall. The presence of an appropriate amount of moisture in the mortar can make the cement fully produce good properties for water and water. The viscosity of hydroxypropylmethylcellulose in the mortar can be proportional, and the higher the viscosity, the better the water retention of hydroxypropylmethylcellulose.Once the moisture content of hydroxypropylmethylcellulose is too high, the water retention of hydroxypropylmethylcellulose will decrease, which will directly lead to a decrease in the construction efficiency of hydroxypropylmethylcellulose.The more familiar things we are, the easier it will be to make mistakes. We should always keep them fresh and we will receive unexpected results.

The apparent viscosity is an important indicator of hydroxypropylmethylcellulose.The usual measurement methods are rotary viscosity measurement method, capillary viscosity measurement method and falling autumn viscosity measurement method.In the past, the determination method of hydroxypropylmethylcellulose was capillary viscometer, which used a Wu's viscometer.Usually the measurement solution is an aqueous solution of 2, and the formula is: V=Kdt.V represents the viscosity, the unit is, K is the constant of the viscometer, d represents the density at constant temperature, and t refers to the time from top to bottom through the viscometer, the unit is s in seconds.This method is more cumbersome to operate. If there are insolubles, it is easy to cause errors, and it is difficult to identify the quality of hydroxypropylmethylcellulose.The problem of stratification of construction glue is a big problem encountered by customers. First of all, the problem of raw materials should be considered for the stratification of construction glue. The main reason for the stratification of construction glue is caused by the incompatible polyvinyl alcohol (PVA) and hydroxypropylmethylcellulose (HPMC).The second is because the stirring time is not enough; there is also the poor thickening performance of construction glue.

In construction glue, instant-soluble hydroxypropylmethylcellulose (HPMC) must be used, because hydroxypropylmethylcellulose (HPMC) is only dispersed in water and does not really dissolve.After about 2 minutes, the viscosity of the liquid slowly becomes larger, forming a transparent viscous colloid.Hot-soluble products, clumping in cold water, can quickly disperse in hot water and disappear in hot water. When the temperature drops to a certain temperature, the viscosity slowly appears until a transparent viscous colloid is formed.The recommended amount of hydroxypropylmethylcellulose (HPMC) to be added to construction glue is 2-4kg.Hydroxypropylmethylcellulose (HPMC) has stable chemical properties, mildew resistance, good water retention effect in construction glue, and is not affected by changes in pH value, and its viscosity can be used from 100,000S to 200,000S.However, in production, it is not that the higher the viscosity, the better. The viscosity is inversely proportional to the bond strength. The higher the viscosity, the smaller the strength. Generally, the viscosity of 100,000S is appropriate.