Harnessing Steric Hindrance for High-Solids LoadsWhen solid loading reaches its threshold, electrostatic repulsion alone cannot prevent particle collisions.Technical Data: Sunlets’ R&D demonstrates that utilizing modified sodium polyacrylate creates a physical barrier (the "Molecular Brush" effect). This mechanism allows a 2% increase in solid loading while simultaneously reducing apparent viscosity by 15% compared to traditional inorganic electrolytes.
Enhanced Cake Permeability: They prevent the "over-densification" of the filter cake, maintaining microscopic drainage channels.Mold Protection: Traditional salts cause "salting-out," the primary enemy of resin molds. New-generation inorganic agents utilize low-sodium technologies, which internal data shows reduce micropore clogging by over 20% compared to traditional silicates.
Organic polymers adsorb onto clay surfaces, acting like microscopic brushes that prevent re-agglomeration even under intense 1.5 MPa pressure. This creates a more permeable Filter Cake, allowing water to escape efficiently and shortening the cycle time.
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.
Modern organic decoagulants (such as sodium polyacrylate) not only play a dispersing role,The long-chain molecules can also play a certain bridging effect between the particles to improve the flexural strength of the green body.For complex types such as intelligent toilets, the use of the decoagulation system recommended by Senlant can reduce the breakage rate of green blanks by more than 5%.
We have found through long-term observation that,If the dispersant molecular weight is not properly selected, excessively long polymer chains can block the micropores of the mold (about 10-20 μm).In the high-end OEM production line, we recommend the use of medium molecular weight polyacrylic acid dispersant. This can not only ensure the stability of the slurry, but also ensure that the drainage rate of the mold is not damaged,So as to extend the service life of the mold by more than 20%.
Never put solid decoagulant directly. An aqueous solution with a specific concentration (usually 10%-20%) must be prepared in advance and added precisely by a metering pump to avoid "burning" due to excessive local charge density of the slurry ".
Polymeric organic decoagulants such as sodium polyacrylate are the first choice for modern high-end molding processes.Synergistic mechanism: In addition to electrostatic repulsion, its long-chain molecules attach to the surface of the particles to form a barrier layer, resulting in a steric effect.Stability advantage: This "dual stabilization" mechanism makes the slurry much less sensitive to temperature and shear forces. Even under the condition of high solid content,Also can maintain excellent thixotropy.
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.
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.
Achieves significant plasticizing effects at lower dosages, reducing production costs. Effectively reduces friction between particles, improving the workability and flexibility of the body. Effectively disperses particles, prevents agglomeration, and improves the uniformity and stability of the body.
Particles with the same charge have repulsive force, preventing aggregation.Particles have attractive force, promoting aggregation.Hydrated ions form an adsorbed layer on the particle surface, increasing the bonding force between particles.
Compound different types of plasticizers to take advantage of their respective advantages and achieve better flexibility. For example, a combination of PVA and CMC can balance flexibility and environmental protection. Optimize the plasticizer dosage based on the ceramic formulation and forming process, balancing flexibility and other performance indicators.
Choose the appropriate plasticizer type and dosage based on the specific ceramic material. Minimize plasticizer dosage while meeting workability requirements to reduce its impact on drying performance. Combine different types of plasticizers to leverage their respective advantages and optimize drying performance. Combine the use of plasticizers with optimized drying parameters such as temperature, humidity, and air velocity to achieve the best drying effect.
Improving Interparticle Lubricity: Plasticizers form a lubricating layer between particles, reducing interparticle friction and making particles easier to slide, reducing the plastic viscosity of the slip.Changing Particle Dispersion State: Plasticizers can promote particle dispersion, prevent particle agglomeration, and form a more uniform and stable slip system.
Reduce Interparticle Friction: Plasticizer molecules form a lubricating layer between particles, reducing interparticle friction and making the body easier to deform.Enhance Interparticle Bonding: Plasticizers interact with particle surfaces, enhancing interparticle bonding, increasing body strength and toughness.Improve Wetting: Plasticizers improve the wetting of the liquid phase (such as water) on solid particles, promoting uniform distribution between particles and increasing body plasticity.Delay Solidification Rate: Some plasticizers can delay the solidification rate of the slurry, extending processing time and improving production efficiency.
Although the cost of traditional sodium silicate (water glass) is low, the sodium ion in it is in the long-term High-Pressure grouting (High-Pressure Casting) cycle,Crystals are easily precipitated in the pores of the resin mold, resulting in mold clogging and reduced drainage performance. Sunland's recommendation: In the high-end production line, we recommend the use of low-sodium or sodium-free organic decoagulants. This can not only prolong the service life of the mold by 15%-20%, but also reduce the excessive introduction of flux in the subsequent Firing stage,Reduce the deformation rate of the product.
We recommend the use of environmentally friendly plasticizers with step decomposition characteristics. They release carbon oxides smoothly between 300 ℃ and 600 ℃, and will not break through the glaze layer on the surface. This guarantees a high pass rate for the first firing at the chemical microscopic level,Eliminates the huge hidden energy loss caused by secondary firing.
In over-dispersed systems lacking plasticizer support, the green body tends to develop microscopic closed pores during drying. During the Firing stage, trapped air within these closed pores cannot escape. As the body undergoes Vitrification, this entrapped air is sealed beneath the surface, often erupting as severe Glaze Slip application issues or post-firing Pinhole / Blister flaws.
Selecting and dosing plasticizers is an exercise in equilibrium. It requires a deep understanding of the material's behavior from the Casting Slip phase through to the final Kiln exit. For global partners seeking to optimize their yield, Sunlets provides not just the High-Pressure Casting equipment, but the chemical expertise to ensure every Green Body is a masterpiece of durability.
