Quanxu SS-907 Silica Matting Agent

SS-907 Silicon Dioxide

Usually, silica particles must be able to adhere to the surface of the main base particles to affect the physical properties of the main base particles.

The degree of this adhesion can be from covering the entire surface of the particles to covering part of the surface of the particles in spots. But in

any case, there is an affinity between silica particles and the main base particles, and they will form an orderly mixture. Today, the editor will take you

to understand the mechanism of silica's anti-caking effect, and hope it will be helpful to you.

(1) Provide physical barrier effect. When the surface of the main base particles is completely covered by silica particles, due to the mall interaction between

silica particles, the silica layer formed naturally becomes a physical barrier that blocks the interaction betweenthe main base particles. This physical barrier

will lead to several results. First, silica blocks the hydrophilic substances on the surface of the main base material, forming liquid bridges between particles

due to moisture absorption or free water remaining during preparation.

Second, after silica is adsorbed on the surface of the main base material, it makes it smoother, thereby reducing the friction between particles and increasing the

fluidity of the particles. This effect is often called lubrication. Since various silicas have different properties, the lubrication they provide is also different.

(2) By competing with the main base material particles for moisture absorption, the main base material's tendency to absorb moisture and agglomerate is improved.

Generally speaking, silica itself has a large moisture absorption capacity, so when competing with the main base material for moisture absorption, it will reduce the main base

material's tendency to agglomerate due to hygroscopicity.

(3) By eliminating the static charge and molecular forces on the surface of the main base material, its fluidity is improved. Microencapsulated powder particles generally have

the same charge, so they will repel each other and prevent agglomeration. However, the static charge on these products often interacts with the frictional electrostatics of

production equipment or packaging materials, causing many troubles. When silicon dioxide is added, it neutralizes the charge on the surface of the main base material particles,

thereby improving the fluidity of the main base material powder. This effect is often used to explain why when the affinity between silicon dioxide and the main base material

particles is not very strong and silicon dioxide is only scattered on the surface of the main base material particles, it can improve its fluidity very well.

(4) By changing the crystal lattice of the main base material crystals, a fragile crystal structure is formed. When silicon dioxide exists in the aqueous solution of the crystallizable

substance in the main base material or on the surface of the crystallized particles, it can not only inhibit thegrowth of the crystals, but also change its crystal structure, thereby

producing a crystal that is very fragile under the action of external force. It reduces the agglomeration phenomenon of the main base material that is prone to forming hard lumps

and improves its fluidity.