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The water retention of hydroxypropyl methyl cellulose decreases with the increase of temperature, and the fineness also requires 20% to 60% of the particle size to be less than 63um, and the surface immediately dissolves to form a gel to wrap the material to prevent water molecules continue to penetrate,

According to the application, Hydroxypropyl Methyl Cellulose (HPMC) can be divided into construction grade, food-grade, and medical grade. In construction, HPMC is mainly used in putty powder, accounting for 90% of the total.

This article mainly describes the four production technologies and formulas of HPMC. Hydroxypropyl Methylcellulose (HPMC) or Hypromellose is a water-soluble non-ionic cellulose ether polymer. With good performance of thickening, dispersion, emulsification, suspension, adsorption, surface activity,

1. How to choose a suitable hydroxypropyl methylcellulose (HPMC) for different purposes?

In dry mix mortar, adding a little HPMC can significantly improve the performance of wet mortar. It can be seen that HPMC is a major additive that affects the construction performance of mortar.

In recent years, with the continuous development of external wall insulation technology, the continuous progress of cellulose production technology, and the excellent characteristics of HP cellulose itself, HP cellulose has been widely used in the construction industry.

Viscosity is an important parameter of HPMC performance. At present, different HPMC manufacturers use different methods and instruments to determine the viscosity of HPMC. The main methods are HaakeRotovisko, Hoppler, Ubbelohde and Brookfield.

The cold water instant type of hydroxypropyl methyl cellulose HPMC is surface-treated with glyoxal, and it is quickly dispersed in cold water, but it is not really dissolved. When the viscosity rises, the aqueous solution becomes clear. The hot melt type is not surface treated with glyoxal.

HPMC (Hydroxypropyl methylcellulose) is generally used in putty powder with a viscosity of 100,000 mPa.s(NDJ), while mortar requires a relatively high viscosity and should be selected with a viscosity of 150,000mPa.s to achieve the desired effect. The most important role of HPMC is water retention and thickening secondly. Therefore, in putty powder, it is okay […]