Pregelatinized Cassava Starch possesses definite auxiliary lubricating effects on materials and serves as a cost-effective functional lubricating auxiliary. Though its lubricating intensity is lower than that of professional lubricants such as stearic acid and talc powder, it effectively improves material lubricity, fluidity and anti-sticking performance in both dry powder and wet forming systems. It is widely applicable to conventional powder processing fields including feed production, building material manufacturing, chemical tableting and powder metallurgy.
Its lubricating mechanism is divided into dry-state and wet-state modes. Under dry working conditions, refined and pulverized Pregelatinized Cassava Starch features uniform, rounded particles without sharp edges, delivering a much lower friction coefficient than irregular conventional powder particles. When blended into base materials, fine starch particles evenly distribute in inter-particle gaps and function as micro ball bearings for support and isolation. This structure reduces sliding friction and particle jamming, optimizes powder fluidity significantly, and solves common problems such as powder stagnation, wall adhesion and uneven discharging.
Under wet working conditions, Pregelatinized Cassava Starch rapidly absorbs water and gelatinizes during stirring, forming a delicate, smooth viscous colloidal film that fully encapsulates all material particles. The ductile, smooth colloidal layer eliminates rough contact surfaces and reduces internal particle friction. Meanwhile, it lowers adhesive friction between materials and the inner walls of mixers, molds and conveying equipment, realizing efficient anti-sticking and drag reduction. It streamlines forming, extrusion and tableting procedures and reduces equipment wear and material loss.
It is essential to clarify the limitations of its lubricating performance. The core functions of Pregelatinized Cassava Starch are adhesion enhancement, water retention, thickening and powder state modification, while lubrication is only a secondary auxiliary attribute. It cannot meet the high-standard requirements of professional lubricants for extreme drag reduction, demolding and wear resistance. For high-precision tableting, high-speed extrusion and ultra-low-friction industrial processes, it must be compounded with specialized lubricants.
In addition, its lubricating effect is positively correlated with dosage, yet excessive addition causes excessive material viscosity and over-high fluidity, resulting in loose forming, reduced product strength and demolding slippage. A dosage of 2% to 4% delivers optimal auxiliary lubrication in conventional scenarios, balancing processing smoothness, finished product strength and forming stability, and satisfying most industrial and civil powder processing requirements.
