Production Method:

Polyvinyl alcohol (PVA) fibers utilize raw materials with an average molecular weight ranging from 60,000 to 150,000, a thermal decomposition temperature of 200 to 220°C, and a melting point of 225 to 230°C. PVA fibers can be produced through both wet spinning and dry spinning methods. After heat treatment, PVA fibers can be further processed through acetalization to obtain PVA-acetal fibers. The acetalization process involves washing the fibers with water to remove sodium sulfate, passing them through an acetalizing solution (comprising formaldehyde as the acetalizing agent, water as the diluent, sulfuric acid as the catalyst, and sodium sulfate as the antisolvent swelling agent), and then washing them again. Alternatively, the fiber bundle can be cut into short fibers, transported to the post-treatment machine via air flow, and subjected to acetalization on a stainless steel mesh. To enhance fiber properties, PVA solutions containing cross-linking agent boric acid (16% concentration) can be wet spun, with the resulting primary fibers凝固ed in an alkaline coagulation bath. After neutralization, water washing, and multi-stage high-temperature stretching and heat treatment, long fibers with strengths of 106 to 115 cN/dtex can be obtained.

Performance:

It boasts excellent mechanical properties, with high strength, high modulus, and low elongation.

2. Strong resistance to acidity, alkalinity, and chemicals.

3. Lightfastness: Low fiber strength loss rate under prolonged sunlight exposure.

4. Corrosion Resistance: The fiber remains mold-free, rot-free, and insect-proof when buried underground for extended periods.

5. The fiber exhibits excellent dispersibility: it doesn't stick together and disperses well in water.

6. The fiber has good affinity with cement, plastic, and other materials, featuring high bonding strength.

7. Non-toxic and harmless to humans and the environment.