Method for producing phase change sand for casting by using organic resin casting waste sand
By crushing, screening, magnetic separation, dust removal, and oxygen-limited thermal desorption of organic resin foundry waste sand, a microporous rough layer is constructed. Then, by using ethanol/water mixed solvent for coupling modification and vacuum-pressure alternating infiltration of composite phase change materials, the problems of low added value and insufficient load stability of phase change materials in the treatment of organic resin foundry waste sand are solved, and efficient phase change sand preparation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGXI YULIN YUCHAI IND CHEM CO LTD
- Filing Date
- 2026-04-15
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the treatment of organic resin foundry waste sand mainly focuses on restoring its ordinary filler properties, resulting in low product added value. Furthermore, the existing phase change materials have insufficient load stability and thermal cycling performance, making it difficult to achieve efficient utilization.
By crushing, screening, magnetic separation, dust removal, oxygen-limited thermal desorption, and chemical activation of organic resin foundry waste sand, a microporous rough layer is constructed. Then, a coupling modification is performed using an ethanol/water mixed solvent. Combined with vacuum-pressure alternating impregnation of composite phase change materials, a composite coating structure of inorganic barrier and organic flexible layer is finally formed.
It significantly improves the added value of waste sand and the thermal conductivity, impermeability and thermal cycling stability of phase change sand, making it suitable for building temperature regulation, road heat storage and energy storage backfilling.
Smart Images
Figure CN122405232A_ABST