Chalking erosion appears in epoxy castings during outdoor use

The product surface chalks and peels off year by year. 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: Epoxy resin has poor ultraviolet light resistance, This factor affects the '2079851475616104453 and final quality of the product. (2) Material stability aspect: Long-term exposure to sun and rain causes photo-oxidative degradation, Molecular chain scission causes an irreversible decline in material properties. (3) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: Control deviation of key process parameters causes the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: Equipment precision and maintenance status affect the stable execution of process parameters.

(1) Implementation measure: Apply a weather-resistant topcoat on the product surface, Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (2) Formulation optimization: Add ultraviolet absorbers and hindered amine light stabilizers to the formulation, Determine the optimal addition amount through small-batch tests, and verify the effect on the overall performance of the product. (3) Material selection: Select systems with better weather resistance such as alicyclic epoxy., 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.