Hydroxypropyl Guar (HPG), also called guar ether, 2-hydroxypropyl ether, gum guar 2-hydroxypropyl ether, and propoxylated, is formed by the etherification reaction with non-ionic propylene oxide reagent with guar gum. Hydroxypropyl Guar Gum is used as an inert ingredient as a thickener in pesticide formulations applied to growing crops. It is used as an indirect food additive and as a sizing agent in textiles and in papers.
Guar gum ether shows a pseudoplastic rheological behavior: At low shear rate values, guar and cellulose are very close to each other, while, at high shear rate values, the viscosity of a solution of guar decreases more significantly. This lower viscosity gives the wet mortar good workability and a smooth surface.
Thus, guar improves the adhesion and the wet system's stability without negatively influencing neither its consistency nor its water retention and showing excellent workability and a perfect finish.
Hydroxypropyl Guar Gum has excellent water retention properties due to adequate molar substitution. Water retention is considered the most important parameter in the construction application and helps in the binder's better setting. It also reduces the effect of plastic shrinking.
Guar ether improves the consistency of the mortar. This avoids the sagging of plaster and improves the resistance to tile sagging when applied on vertical walls.
Textile industry: – sizing, finishing and printing
Paper industry: - improved sheet formation, folding and denser surface for printing
Explosives industry – as waterproofing agent mixed with ammonium nitrate, nitroglycerin, etc.
Pharmaceutical industry – as binder or as disintegrator in tablets; main ingredient in some bulk-forming laxatives
Cosmetics and toiletries industries – thickener in toothpastes, conditioner in shampoos (usually in a chemically modified version)
Personal Care - HPG may be used in bath products, hair conditioners, hair dyes, other hair care products and skin care products