Water-Soluble Polyvinyl Alcohol Fiber

Water-soluble polyvinyl alcohol fiber is a type of synthetic fiber that is soluble in water, making it easy to dissolve and remove from textiles during the finishing process. As a fiber material solution provider, Alfa Chemistry provides water-soluble polyvinyl alcohol fiber products to meet specific needs.

Introduction

Preparation Method

• Wet spinning. In wet spinning, polyvinyl alcohol (PVA) is dissolved in a solvent, such as water, to form a viscous solution. The solution is then forced through a spinneret into a coagulating bath containing a nonsolvent. The coagulating bath causes the PVA to precipitate, forming fibers. The fibers are then washed, dried, and stretched to improve their mechanical properties.
• Dry spinning. In dry spinning, a high concentration of polyvinyl alcohol solution is sprayed into hot air to evaporate the solvent and solidify into filaments. Then, water-soluble polyvinyl alcohol fiber is obtained by dry heat drawing and heat treatment. The advantage of this method is that the spinning process is simple and suitable for the production of a variety of water-soluble polyvinyl alcohol filaments, especially suitable for the production of room temperature water-soluble polyvinyl alcohol fibers.
• Semi-melt spinning. In semi-melt spinning, PVA is partially melted before being extruded through a spinneret to form fibers. The fibers are then cooled and solidified to improve their mechanical properties. This method is used to produce fibers with higher tenacity and modulus compared to wet or dry spinning.
• Boric acid gel spinning. The boric acid gel spinning method is to spray the polyvinyl alcohol gel solution with boric acid added into a NaOH and Na2SO4 coagulating bath for forming and cross-linking. Then, the water-soluble polyvinyl alcohol fiber is obtained by stretching, neutralizing and washing, drying, dry heat stretching and heat treatment under wet and hot conditions. The cross-linking of the fiber can make it have good stability in the atmosphere with medium humidity, and it will be hydrolyzed and detached quickly in water, so its water solubility is not affected.
• Gel spinning. The gel spinning method is to dissolve polyvinyl alcohol in an organic solvent with relatively good solubility as a spinning solution. After the spinning solution is extruded from the spinneret, it is quickly cooled into a gel state and then gradually solidified in a low-temperature coagulation bath. This method can obtain polyvinyl alcohol fibers with low alcoholysis degree, high strength, low shrinkage, and low adhesion. The method is characterized in that there is no water in the entire process and it is completed in a closed system. The solution in the system is completely recycled and reused, no waste liquid is discharged, and the environment is not polluted.

Our products and services are for research use only.