What are the main steps in the production process of Polyacrylonitrile Fiber?
Publish Time: 2024-05-27
The production process of Polyacrylonitrile Fiber is a complex and delicate process, which mainly includes the following key steps:
Polymerization: The production of Polyacrylonitrile Fiber begins with the polymerization stage. At this stage, acrylonitrile, as the main raw material, is copolymerized with a small amount of second monomers (such as methyl acrylate, methyl methacrylate, etc.) and third monomers (such as sodium propylene sulfonate, etc.). The purpose of this step is to generate polyacrylonitrile copolymers with specific molecular structures and properties.
Spinning: After the polymerization is completed, the spinning stage is entered. Spinning is the process of stretching the polymerized polyacrylonitrile copolymer into continuous fibers through specific spinning equipment, such as spinnerets. During the spinning process, the concentration, temperature, drawing speed and other parameters of the spinning solution have a significant impact on the performance of the fiber.
Preheating and drafting: The spun fiber is first preheated to improve its stability and processability. Subsequently, the fiber is steam-drawn, which further improves the strength and elasticity of the fiber through stretching and orientation.
Washing and drying: The drawn fibers need to be washed to remove residual solvents and impurities. The fibers are then dried to remove excess moisture in preparation for subsequent processing.
Heat setting and crimping: The dried fiber undergoes heat setting treatment, and the structure of the fiber is stabilized through the heating and cooling process. Finally, the fibers are crimped, giving them good softness and bulk.
Cutting and baling: The crimped fibers are cut into required lengths and baled for easy storage and transportation.
The above steps constitute the main production process of Polyacrylonitrile Fiber. By strictly controlling the process parameters of each step, Polyacrylonitrile Fiber with excellent performance can be produced, which is widely used in clothing, decoration, industry and other fields.
