Use of HPMC in Industrial Applications Benefits, Properties, and Common Uses
Due to its high degree of methoxylation, MHEC is the only cellulose derivative with the best water retention, which is the only reason why MHEC is sold for use in cement-based wall putties and mortars. MHEC is also used in cement-based tile adhesives and grouts.
The working mechanism of methyl hydroxyethyl cellulose, MHEC (Mw = 2.5 · 105 g/mol, DSmethyl = 1.81, MShydroxyethyl = 0.15) as water retention agent in cement was investigated. First, the hydrocolloid was characterized and its performance as non-ionic water retention agent was determined employing the filter paper test. Also, water sorption and swelling of individual MHEC fibers under conditions of different humidities were monitored by ESEM imaging. Second, its working mechanism was established. It was found that at low dosages, MHEC achieves water retention by intramolecular sorption of water and concomitant swelling while at higher dosages, MHEC molecules agglomerate into large hydrocolloidal microgel particles (d > 1 μm) which effectively plug the pores in the mortar matrix. MHEC association was evidenced by an exponential increase in solution viscosity as concentration rises, a strong increase in the hydrodynamic diameter of solved MHEC molecules, and a noticeable reduction of surface tension.
MHEC powder is harnessed for personal care and cosmetic products due to its outstanding thickening, stabilizing, and moisturizing attributes. It features prominently in creams, lotions, shampoos, toothpaste, and gels, functioning as a rheology modifier. This enhances product consistency and ensures the even dispersion of active ingredients.
MHEC LH 4000M