CN-119308037-B - Preparation method of hydrophilic conductive polyphenylene sulfide fiber

Abstract

The invention provides a preparation method of hydrophilic conductive polyphenylene sulfide fibers, and belongs to the technical field of textile fiber preparation. The invention utilizes a double-screw extruder to melt and blend the conductive auxiliary agent, the hydrophilic auxiliary agent and the polyphenylene sulfide resin, and then the hydrophilic conductive polyphenylene sulfide fiber is obtained by spinning. According to the invention, the double-screw multi-region high-pressure high-shear interactive in-situ grafting technology is utilized, and the fiber preparation is completed in one step through melt blending and spinning forming, so that the hydrophilic auxiliary agent is loaded on the conductive auxiliary agent, the dispersibility of the conductive auxiliary agent and the compatibility with a PPS matrix are improved, the uniformly dispersed conductive auxiliary agent can form a crosslinked network structure in the PPS matrix, and the conductivity and the hydrophilic performance of the polyphenylene sulfide fiber are improved.

Inventors

• LIAN DANDAN
• ZHANG JIAXIN
• Lan Mulinsen
• MA TENG
• LU JIANJUN

Assignees

• 太原理工大学

Dates

Publication Date

20260512

Application Date

20241126

Claims (5)

1. 1. The preparation method of the hydrophilic conductive polyphenylene sulfide fiber is characterized in that a double-screw extruder is utilized to melt and blend a conductive auxiliary agent, a hydrophilic auxiliary agent and polyphenylene sulfide resin, and then spinning is carried out to obtain the hydrophilic conductive polyphenylene sulfide fiber; the double-screw extruder is provided with ten areas, a main feeding port and an auxiliary feeding port 1 are arranged in one area, polyphenylene sulfide resin and a conductive additive are respectively added into the main feeding port and the auxiliary feeding port 1, a large-lead screw thread element is used for heating and conveying in a second area, a feeding port 2 is arranged in a third area, a hydrophilic additive is added into the feeding port 2, after materials are fully melted in a fourth area and a fifth area, 2 build-up areas are arranged in the sixth area and the seventh area by using a reverse screw thread element, a triangular kneading element and a pin-type mixing element are arranged in the build-up areas, interaction is enhanced while shearing stress is increased, a tooth-shaped kneading element is arranged in the eighth area for kneading, homogenization treatment is carried out in the ninth area, and extrusion is carried out in the tenth area; The conductive additive is a multi-wall carbon nano tube, the hydrophilic additive is sodium polyacrylate, the multi-wall carbon nano tube accounts for 2.5-4% of the total mass of the polyphenylene sulfide resin, the multi-wall carbon nano tube and the sodium polyacrylate, the sodium polyacrylate accounts for 0.1-1.5% of the total mass of the polyphenylene sulfide resin, the multi-wall carbon nano tube and the sodium polyacrylate, and the multi-wall carbon nano tube is the multi-wall carbon nano tube subjected to surface amination treatment; The temperature of each zone of the twin-screw extruder is configured to be 270 ℃ plus or minus 5 ℃ in the first zone, 282 ℃ plus or minus 5 ℃ in the second zone, 285 ℃ plus or minus 5 ℃ in the third zone, 287 ℃ plus or minus 5 ℃ in the fourth zone, 289 ℃ plus or minus 5 ℃ in the fifth zone, 291 ℃ plus or minus 5 ℃ in the sixth zone, 294 ℃ plus or minus 5 ℃ in the seventh zone, 295 ℃ plus or minus 5 ℃ in the eighth zone, 300 ℃ plus or minus 5 ℃ in the ninth zone, and 302 ℃ plus or minus 5 ℃ in the tenth zone; The melt pressures of the sixth area and the tenth area are 7-8.5 MPa; The spinning is specifically characterized in that after melt blending, melt is extruded into an elbow through ten areas, the elbow enters a metering pump, the melt enters a spinning box body after accurate metering, a spinning component enters the box body, the melt is extruded into a melt trickle through a spinneret plate, and then the melt trickle is cooled and molded, two drafting steps are formed on fibers by using a 3 hot plate and a 2 hot box, wherein the temperature of the first hot plate is 90 ℃ plus or minus 1 ℃, the temperature of the second hot plate is 92 ℃ plus or minus 2 ℃, the temperature of the third hot plate is 92 ℃ plus or minus 2 ℃, the temperature of the first hot box is 110 ℃ plus or minus 2 ℃, the temperature of the second hot box is 112 ℃ plus or minus 2 ℃, the total drafting multiple is 3-5 times, and the drafting areas are configured as small areas and big areas.
2. 2. The method for preparing hydrophilic conductive polyphenylene sulfide fibers according to claim 1, wherein the set temperatures of the elbow pipe, the metering pump and the tank are 300 ℃ + -5 ℃.
3. 3. A hydrophilic conductive polyphenylene sulfide fiber prepared by the preparation method of any one of claims 1 to 2.
4. 4. A hydrophilic conductive polyphenylene sulfide fiber fabric type alkaline water electrolysis membrane, which is characterized by being woven from the hydrophilic conductive polyphenylene sulfide fiber according to claim 3.
5. 5. Use of the hydrophilic conductive polyphenylene sulfide fiber fabric type alkaline water electrolysis membrane according to claim 4 in hydrogen production by water electrolysis.

Description

Preparation method of hydrophilic conductive polyphenylene sulfide fiber Technical Field The invention relates to the technical field of textile fiber preparation, in particular to a preparation method of hydrophilic conductive polyphenylene sulfide fibers. Background With the development and equipment research of key technologies of high-efficiency high-power alkaline water electrolytic cells, the technical attack of polyphenylene sulfide (PPS) diaphragms for hydrogen production alkaline electrolytic cells is very important. The separator material is an important component of an alkaline electrolyzer, and the main functions include 3 aspects, ① separation of the cathode and anode to form cathode and anode cells, short circuit prevention, ② prevention of mixing of the two-pole gas products, and ③ high ion conductivity, so that hydroxide ions can be transferred from the cathode to the anode. Therefore, the ideal diaphragm material has the characteristics of good ion conductivity, high porosity and low resistivity ①, high gas barrier property, high hydrophilicity and high corrosion resistance ②, thin ③ thickness, small pore diameter, high mechanical strength, good dimensional stability, low ④ cost and long service life (generally 10 years). The PPS fiber has good heat stability, chemical stability, corrosion resistance, flame retardance and other performances, and is a main raw material of the diaphragm for the hydrogen production alkaline electrolytic cell at present. However, the molecular chain of PPS does not contain polar groups, so that the hydrophilicity and conductivity of PPS are poor, the direct application can lead to high resistivity of electrolytic hydrogen production, large power consumption and serious safety accidents. Therefore, the conventional technical means for improving the hydrophilicity of the PPS fiber membrane at present is to carry out sulfonation post-treatment on the base membrane by using strong oxidizing acid, and can introduce sulfonic acid groups (-SO 3 H) on the macromolecular chain of the base membrane, SO that the hydrophilicity of the material can be improved. However, the defect is that the sulfonation reaction can swell the material while improving the hydrophilicity of PPS, the surface of the material is roughened due to strong acid etching, and the mechanical properties of the material are negatively affected by insufficient sulfonation or excessive sulfonation. And, the sulfonic acid group reacts with KOH in the alkaline electrolytic cell in the subsequent use process, and gradually loses to cause deterioration of hydrophilicity. Disclosure of Invention In view of the above, the invention aims to provide a preparation method of hydrophilic conductive polyphenylene sulfide fibers, and provides a double-screw multi-region high-pressure high-shear interaction in-situ grafting technology, which improves the dispersibility of a conductive auxiliary agent and the compatibility with a PPS matrix, and the uniformly dispersed conductive auxiliary agent can form a crosslinked network structure in the PPS matrix, so that the hydrophilic performance and the conductive performance of the polyphenylene sulfide fibers are improved. Meanwhile, the melt blending and the spinning forming are completed in one step, so that the preparation efficiency is improved, the additive materials can be effectively protected, and excessive oxidative degradation is avoided. In order to achieve the above object, the present invention provides the following technical solutions: According to one of the technical schemes, a preparation method of hydrophilic conductive polyphenylene sulfide fibers comprises the steps of carrying out melt blending on a conductive auxiliary agent, a hydrophilic auxiliary agent and polyphenylene sulfide resin by using a double-screw extruder, and then spinning to obtain the hydrophilic conductive polyphenylene sulfide fibers; The double-screw extruder is provided with ten areas, a main feeding port and an auxiliary feeding port 1 are arranged in one area, polyphenylene sulfide resin and a conductive additive are respectively added to the main feeding port and the auxiliary feeding port 1, a large-lead threaded element is used for heating and conveying in the second area, a feeding port 2 is arranged in the third area, a hydrophilic additive is added to the feeding port 2, after the materials are fully melted in the fourth area and the fifth area, high-pressure shearing is carried out in the sixth area and the seventh area, kneading is carried out in the eighth area, homogenization treatment is carried out in the ninth area, and extrusion is carried out in the tenth area. According to the second technical scheme, the hydrophilic conductive polyphenylene sulfide fiber is prepared by the preparation method. According to the third technical scheme, the hydrophilic conductive polyphenylene sulfide fiber fabric type alkaline water electrolysis diaphragm is obtained by spinning th