Room-temperature-cured laminated products deforming under sunlight exposure

FRP products placed under the sun deform. Deformation usually gradually intensifies after demolding, especially in asymmetric structures or parts with large wall thickness differences. This problem causes product dimensions to exceed the tolerance range, affecting assembly accuracy and product function.

(1) Process factor: resin Tg relatively low; this factor affects the '2079851475616104453 and final quality of the product. (2) Temperature parameter aspect: sunlight exposure raising temperature above Tg causing thermal deformation; temperature deviation directly affects the physicochemical state and reaction progress of the material. (3) Process aspect: uneven cooling causing shrinkage differences in various regions producing thermal stress. (4) Design aspect: asymmetric structure or uneven wall thickness distribution causing anisotropic shrinkage. (5) Material aspect: differences in molecular chain orientation or fiber alignment direction causing different shrinkage in each direction.

(1) Material selection: use high Tg resin systems; establish material selection evaluation standards and determine the optimal solution through comparative tests. (2) Implementation measures: cure the product on the mold to maintain shape; formulate specific operation plans based on actual production conditions and verify implementation effects. (3) Formulation adjustment: apply sunlight-reflective coating to reduce heat absorption., adjust gradually and verify the effect, ensuring that other performance indicators of the product are not affected. (4) Preventive measures: perform shrinkage and warpage simulation analysis during the product design stage to optimize structure and process plans in advance.

Deformation problems originate from internal stress caused by uneven shrinkage or heating in various parts of the product, and need to be systematically solved from three aspects: structural design, process parameters, and post-treatment.