Method for preparing polyacrylonitrile nano-fiber by electrolyte solution circulation high-pressure electrostatic spinning
A technology of high-voltage electrospinning and electrolyte solution, which is applied in fiber processing, rayon manufacturing, fiber chemical characteristics, etc., can solve the problems of poor quality of polymer nanofibers and easy clogging of spinning heads, etc., and achieve concentrated fiber diameter distribution, The effect of small diameter and simple preparation process
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Embodiment 1
[0022] Example 1: Single spinning of 14% w / v polyacrylonitrile (PAN)
[0023] A flattened stainless steel injection needle (inner diameter 0.3 mm) was used as the capillary for jetting fine flow, connected to a high-pressure generator (ZGF2000, Shanghai Sute Electric Co., Ltd.), and the flow of spinning solution was controlled by a micro-injection pump (USA). company) control, the fiber receiving plate 4 adopts the aluminum foil plate to receive nanofibers.
[0024] Disperse 14.0g of PAN powder in 100ml of N,N-dimethylacetamide (DMAc) at room temperature, then shake overnight in a constant temperature shaker at 50°C to prepare a yellow translucent spinning solution, which is High-voltage electrospinning was performed to prepare nanofibrous membranes. Other process parameters are as follows: the flow rate is 1.0mL / h, the distance between the receiving plate and the spinneret is 15cm, and the voltage is 12kV. The ambient temperature is (23±1)°C, and the ambient humidity is 62...
Embodiment 2
[0026] Example 2: Preparation of PAN fibers by 4% w / v lithium chloride DMAc solution circulation high voltage electrospinning
[0027] Using 4% w / v lithium chloride N,N-dimethylacetamide solution as the sheath liquid, using the PAN solution in Example 1 as the core liquid, using a coaxial spinning head, and circulating high-voltage electrospinning through the electrolyte solution PAN fibers were prepared and the flow ratio was controlled by two single-channel axial-flow syringe pumps.
[0028] The specific process parameters are as follows: the sheath / core fluid flow ratio is 0.4 / 2mL / h, the distance between the receiving plate and the spinneret is 15cm, and the voltage is 12kV. The ambient temperature is (23±1)°C, and the ambient humidity is 62±4%.
Embodiment 3
[0030] Example 3: Preparation of PAN fibers by circulating high-voltage electrospinning with 1% w / v lithium chloride DMAc solution
[0031] Using 1% w / v lithium chloride N,N-dimethylacetamide solution as the sheath liquid, using the PAN solution in Example 1 as the core liquid, using a coaxial spinning head, and circulating high-voltage electrospinning through the electrolyte solution PAN fibers were prepared, and the flow ratio was controlled by two single-channel axial-flow syringe pumps, and other conditions were the same as in Example 2.
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