Sweating phenomenon appears in polyurethane casting

Oily liquid seeps from the product surface over a long period. This problem is relatively common in casting molding production and requires comprehensive analysis and solution from multiple aspects of material, process, and equipment.

(1) Process factor: Plasticizers or unreacted low molecular weight components migrate and exude to the surface, This factor affects the '2079851475616104453 and final quality of the product. (2) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (3) Process aspect: Control deviation of key process parameters causes the '2079851475616104453 to deviate from optimal conditions. (4) Equipment aspect: Equipment precision and maintenance status affect the stable execution of process parameters.

(1) Formulation adjustment: Reduce the plasticizer dosage, Adjust gradually and verify the effect, ensuring that other performance indicators of the product are not affected. (2) Process optimization: Extend the post-curing time so that small molecules fully react, Determine a reasonable time according to product wall thickness and material characteristics, balancing production efficiency and quality. (3) Material selection: Select high molecular weight plasticizers or non-migrating plasticizers., Establish material selection evaluation criteria, and determine the optimal solution through comparative tests. (4) Preventive measure: Establish sound process control standards and a quality inspection system, and regularly review process data for continuous optimization.

This problem requires comprehensive analysis from multiple dimensions of material, process, equipment, and operation, and should be solved by systematically optimizing process parameters and the quality control system.