Ethylene-Vinyl Alcohol Copolymer Chips for Plant Cultivation

The patent uses polyvinyl alcohol resin as a binding agent to bind inorganic particles (such as clay, sand, or gravel) to form a composite medium. The inorganic particles provide structural stability and resistance to dissolution, while the polyvinyl alcohol resin provides water retentivity and binding functionality. This composite structure allows the medium to maintain both high water retentivity and long-term stability, as the inorganic framework prevents complete dissolution even though the resin itself is water-soluble.

The patent employs polyvinyl alcohol resin, which is biodegradable and environmentally friendly, as the binding agent. Although the medium has a limited service life due to gradual resin dissolution, this short lifespan is advantageous for recyclability. After use, the medium can be easily disposed of through biodegradation or incineration, eliminating the disposal problems associated with rock wool. The inorganic particles can be recovered and reused, further enhancing recyclability.

The patent combines completely saponified polyvinyl alcohol resin (which provides excellent wettability) with water-insoluble inorganic particles. The resin coating on the particle surfaces enhances water absorption and distribution, while the inorganic core structure prevents dissolution. This composite approach allows the medium to achieve high wettability without sacrificing long-term stability, as the inorganic framework remains intact even when the resin gradually dissolves.