Dehumidifying Composition with pH Control and Self-Hardening

The patent converts the harmful low pH property of concentrated calcium chloride solution into a benefit by adding calcium oxide. The calcium oxide reacts with the acidic solution to raise the pH, transforming the corrosive environment into a protective alkaline environment that actually prevents corrosion of steel surfaces while maintaining the dehumidifying performance of the calcium chloride.

The patent creates a composite dehumidifying composition by combining calcium chloride (for hygroscopic performance), calcium oxide (for pH control and corrosion protection), and pozzolanic materials (for self-hardening). This composite approach allows the system to simultaneously achieve high dehumidifying productivity while eliminating corrosion risks through the synergistic interaction of components.

The patent implements self-service by incorporating pozzolanic materials that automatically react with calcium hydroxide formed during the dehumidifying process to create a self-hardening effect. This self-hardening mechanism occurs automatically as the desiccant absorbs moisture, progressively stiffening the composition to prevent leakage without requiring external intervention or complex additional systems.

The patent controls particle size parameters of all components (calcium chloride, calcium oxide, and pozzolanic materials) to optimize both the self-hardening rate and the final mechanical strength. By carefully controlling these physical parameters, the composition achieves reliable leakage prevention while keeping the formulation relatively simple and manufacturable.

The patent incorporates a pigment-based particulate indicator system that changes color based on the presence of liquid. When the composition is dry, light reflects off particle surfaces giving a lighter appearance; when saturated, the liquid coating absorbs light and the pigment appears darker. This simple optical mechanism provides clear visual saturation indication without requiring complex electronics or additional manufacturing steps.

The patent uses a simple pigment-based optical indicator system that copies the saturation state through color change rather than using complex sensors or detection devices. This approach provides reliable ease of operation for saturation detection while maintaining simplicity in manufacturing and composition.