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In order to obtain accurate and reliable hydroxypropyl methylcellulose viscosity measurement data, several points must be noted:

1. The performance indicators of the instrument must meet the requirements of the national metrological verification regulations.

For the calculation of the insoluble content of hydroxypropyl methylcellulose, the remaining residue should not exceed 5mg (0.5%). Add 300mL of distilled water and set aside; dry the sample and the No. 1 vertical melting glass crucible in advance. The washing liquid is also added to the above glass crucible and filtered, put into a beaker,

Overview of cellulose ether: Cellulose ether is a non-ionic semi-synthetic high molecular polymer. It has two types of water-soluble and solvent-based. The effects caused by different industries are different, such as in chemical building materials. It has the following compound effects:

1. The pure HPMC is in a fluffy visual state, with a small bulk density, ranging from 0.3-0.4g/ml; adulterated HPMC has better fluidity and feels heavier, which is obviously different from the original appearance.

2. The aqueous solution is clear and has high light transmittance, and the water retention rate is ≥97%; the adulterated HPMC water solution is turbid, and the water retention rate is difficult to reach 80%.

Each cellulose ether has the basic structure of cellulose-anhydroglucose structure. In the process of producing cellulose ether, the cellulose fiber is first heated in an alkaline solution, and then treated with an etherifying agent. The fibrous reaction product is purified and ground to form a uniform powder with a certain fineness.

Wall Leveling Putty: for building paint base leveling
External wall Cement Leveling putty Advantages:

Cellulose products are all derived from natural cotton pulp or wood pulp, and are made through etherification. Different cellulose products use different etherifying agents. The etherifying agent used in hydroxyethyl cellulose (HEC) is ethylene oxide, and hydroxypropyl methylcellulose (HPMC) uses other types of etherifying agents.

Cellulose ether HPMC will prolong the setting time of cement paste or mortar and delay the hydration kinetics of cement, which is beneficial to increase the operation time of cement-based materials, improve the consistency of mortar and the loss of concrete slump over time, but it is also possible It will delay the construction progress, especially the mortar and concrete used in low temperature environment.

The rubber powder used in external wall insulation materials is mortar rubber powder. Nowadays, mortar rubber powder has also been widely used in the construction and building materials industry, and it has also been recognized by many people.