The Role of Deflocculants in High-Pressure Casting

Introduction: Rheological challenges in high-pressure environments

In traditional gypsum mold grouting, the decoagulant is mainly responsible for reducing viscosity. However, in the high-pressure grouting process, the slurry not only flows well, but also maintains the stability of the microstructure under the strong pressure of 1.0-1.5 MPa.

As the leader of domestic high pressure grouting equipment,Sunlets through thousands of grouting cycle data monitoring found that: the choice of decondifying agent directly determines the uniformity of body wall thickness and the service life of the mold.

Kinetic Core: Regulating the Permeability of Filter Cake

In the process of high-pressure grouting, the discharge of mud (Slip) moisture depends on the filtration function driven by pressure. Without the precise dispersion of high-performance decoagulants, fine particles (such as very fine clay) will first migrate to the surface of the mold under high pressure, forming a very thin but extremely dense "water barrier". This leads to a large drop in the wall formation velocity.         Experiments show that the filter cake Permeability of the slurry can be increased by 15% by using the composite organic decoagulant recommended by Senlant.This means that in the production of large-size shower room base or one-piece toilet, the molding cycle can be shortened by 10%-15%.

The Guardian of the health of the mold: the value of the non-crystalline decoagulant

The resin mold used for high-pressure grouting is expensive. Traditional inorganic decoagulants (such as sodium silicate) contain a large amount of sodium ions.

In the process of high pressure infiltration, sodium ions will enter the micropores of the mold with moisture. With the evaporation of water, salt crystallization is easy to occur inside the mold, resulting in irreversible Aperture blockage, resulting in early retirement of the mold.

When using our high-pressure grouting equipment, supporting the use of polymer organic decoagulant, can make the effective use of the mold increased 2000-3000 times,Significantly reduces the cost of mold sharing for a single product.

Improve firing stability: reduce local stress

The decoagulant makes the pore distribution inside the unfired body highly uniform by optimizing the arrangement of particles. This homogeneity is critical in the firing phase to ensure a smooth discharge of chemically bound water,Effectively avoid Glaze defects caused by uneven local shrinkage.