Water-retaining agents utilize super absorbent polymers, which are functional high molecular materials with exceptional water-absorbing capabilities. They are non-toxic and harmless, capable of repeatedly releasing and absorbing water, hence likened to "miniature reservoirs" in agriculture. Additionally, they can absorb fertilizers and pesticides and release them slowly, enhancing their efficacy. Super absorbent polymers are widely used in agriculture, forestry, horticulture, construction materials; and in industry, they are extensively applied in petrochemicals, cables, papermaking, sensors, fire extinguishers, fiber products, cosmetics, food preservation, and expandable toys.