Introduction: The game between drying speed and yield
In rapid drying processes (such as microwave drying or controlled waste heat drying), the biggest challenge is the moisture gradient between the surface and the interior of the body. If the surface moisture evaporates too fast and the internal moisture cannot migrate to the surface in time, the body will crack due to uneven shrinkage.Decoagulants not only regulate viscosity, but also ".
Ⅰ、 optimization of microscopic pores
The decoagulant directly affects the permeability of the unburned body by changing the arrangement of clay particles.
From "chaos" to "order": House-of-cards structure),The pores are cluttered and incoherent. The high-efficiency coagulant can guide the particles to be parallel or densely arranged to form a uniform and coherent capillary channel.
Studies have shown that, under the same solid content, the moisture diffusion coefficient of the green body using the composite organic decoagulant can be increased by 15%-20%. This means that moisture migrates more smoothly from the inside to the surface,Support a more aggressive warming curve.
Ⅱ、 reduce the critical moisture content: Shorten the "dangerous drying period"
The most dangerous stage of the drying process is the "constant speed drying period", when the shrinkage is the most severe.
Marginal benefit of increased solids content: The decoagulant allows the slurry to increase the solids content to more than 70% while maintaining a low viscosity.According to, for every 1% reduction in initial moisture, the drying cycle can be shortened by about 5%-8%.
Good decoagulation can significantly reduce the "critical water content" of the body ". This means that the blank body can enter the "slow-down drying period" earlier, when the blank particles have contacted each other, the structure enters a stable state, and the risk of cracking is greatly reduced.
Ⅲ、 improve the toughness of the body: resist thermal stress shock
Rapid drying is usually accompanied by a higher thermal load. Sunlets found in the formulation development of supporting high-pressure grouting equipment:
Polymer "bonding" effect: Modern organic decoagulants form micro-nano-scale polymer bridges between particles during the drying process.
The drying breakage rate can be controlled within 1% by adjusting the molecular amount distribution of the condensate with precision.