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Gypsum mortar is a building material with gypsum as the main component. Gypsum accounts for 70% to 80% of the total weight of the mortar. Other components include lime, silicate, etc. The following is a summary of the effects of several mortar additives on gypsum mortar.

(1) Whiteness: Although whiteness cannot determine whether HPMC is easy to use, and if whitening agent is added in the production process, its quality will be affected. However, most good products have good whiteness.

Hydroxypropyl methyl cellulose plays three roles in the putty powder: thickening, water retention and construction.

According to different uses and performance requirements, you can refer to the recommended ratio according to the product manual and configure it as needed.

HPMC is divided into two types: instant type and hot melt type. The instant type disperses quickly in cold water and initially has no viscosity because the HPMC is only dispersed in the water without actually being dissolved. After about 2 minutes, the liquid gradually thickens and forms a transparent, viscous colloid. Hot-melt products will appear agglomerated in cold water, but will disperse quickly in hot water until the temperature drops to a certain level and the viscosity will gradually increase to form a transparent and viscous colloid. The hot-melt type is mainly used for putty powder and mortar. It may cause lumps in liquid glue and paint, so it is not suitable. The instant type is more widely used and can be used for putty powder, mortar, liquid glue and coatings without specific restrictions.

Hpmc as a water-retaining agent and retarder for cement mortar, it makes the mortar pumpable. In plastering slurry, gypsum, putty powder or other building materials, it is used as a binder to improve spreadability and prolong operation time.

The viscosity of HPMC is inversely proportional to the temperature, that is, the viscosity increases with the decrease of temperature. The viscosity of a product usually refers to the test result of its 2% aqueous solution at 20 ℃.

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HPMC with uniform reaction, methoxy and hydroxypropyl groups are uniformly distributed, and the water retention rate is high.

Excellent temperature stability: As a non-ionic thickener, the viscosity of HPMC-thickened surfactant system is relatively stable with temperature changes, while the system adding Nacl as a thickener will have a jelly phenomenon at low temperatures.

HPMC cellulose is a synthetic polymer chemically modified from natural cellulose. It is composed of part of the hydroxypropylmethyl (Hypromellose) groups in the natural polymer chain of cellulose. This compound is a white to off-white powder with good solubility in water to form a transparent colloidal solution.