Drying of ceramic bodies is a critical step in the ceramic production process, directly impacting the strength, deformation, and cracking risk of the body. While plasticizers are primarily used to improve the workability of the body, they also significantly affect the drying performance. This article explores the mechanisms by which plasticizers influence the drying process and how to optimize plasticizer selection to achieve ideal drying performance.
I. Mechanisms of Plasticizers Affecting the Drying Process
Reducing Drying Shrinkage: Some plasticizers can form a flexible film within the body, reducing drying shrinkage and the risk of cracking. Increasing Body Toughness: Plasticizers can enhance the toughness of the body, enabling it to withstand stresses generated during drying, reducing deformation and cracking. Regulating Moisture Diffusion Rate: Plasticizers can alter the rate of moisture diffusion within the body, controlling the drying speed and preventing excessive internal stress due to rapid surface drying. |  | |
Influencing Body Surface Tension: Plasticizers affect the surface tension of the body, influencing the evaporation rate of water and capillary forces, thereby affecting the drying process. | ||
II. Impact of Different Types of Plasticizers on Drying Performance
PEG (Polyethylene Glycol): PEG has good water retention, which can delay water evaporation and reduce drying shrinkage, but excessive use may prolong drying time.
PAAS (Polyacrylic Acid Sodium): PAAS can increase the toughness of the body and enhance its crack resistance, but may increase drying shrinkage.
Glycerol: Glycerol has good wetting properties, which can promote uniform evaporation of water, but its water retention is poor, which can lead to rapid surface drying.
Starch and its Derivatives: Starch-based plasticizers can reduce drying shrinkage, but are prone to leaving carbon residue, affecting product quality.
Bio-based Plasticizers: Bio-based plasticizers are environmentally friendly and biodegradable, and have a relatively mild effect on drying performance.
III. Optimizing Plasticizer Selection and Formulation Design
Select Plasticizers Based on Ceramic Type: Choose the appropriate plasticizer type and dosage based on the specific ceramic material.
Control Plasticizer Dosage: Minimize plasticizer dosage while meeting workability requirements to reduce its impact on drying performance.
Compound Plasticizers: Combine different types of plasticizers to leverage their respective advantages and optimize drying performance.
Optimize Drying Process: Combine the use of plasticizers with optimized drying parameters such as temperature, humidity, and air velocity to achieve the best drying effect.
TopTime Ceramics is committed to providing customers with comprehensive ceramic material solutions. We have a professional R&D team that can provide customized plasticizer formulations and drying process guidance based on customer-specific needs, helping customers optimize production processes and improve product quality.