Hydrophilic polyphenylene sulfide short fiber filament composite yarn for diaphragm and spinning method of hydrophilic polyphenylene sulfide short fiber filament composite yarn

Abstract

The invention is applicable to the technical field of spinning, and provides a hydrophilic polyphenylene sulfide short fiber and filament composite yarn for a diaphragm, the British count of the composite yarn is 10-20S, and the composite yarn is prepared by carrying out composite spinning on hydrophilic polyphenylene sulfide short fibers and hydrophilic polyphenylene sulfide filaments; the fineness of the hydrophilic polyphenylene sulfide short fiber is 0.89 to 6.67 dtex, and the length of the hydrophilic polyphenylene sulfide short fiber is 38 to 51 mm; the fineness of the hydrophilic polyphenylene sulfide filaments ranges from 66 dtex to 444 dtex. The invention also provides a spinning method of the hydrophilic polyphenylene sulfide short fiber filament composite yarn for the diaphragm, which comprises the following steps of: preparing the hydrophilic polyphenylene sulfide short fiber into hydrophilic polyphenylene sulfide short fiber roving through the processes of curing, blowing, carding, drawing and roving; and the hydrophilic polyphenylene sulfide short fiber roving and the hydrophilic polyphenylene sulfide filaments are subjected to a spinning process and a spooling process. The yarn prepared by the invention has the characteristics of uniform evenness, less hairiness, high strength, stable weaving tension, high production efficiency and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a hydrophilic polyphenylene sulfide staple filament composite yarn for a diaphragm and a spinning method thereof. Background Art

[0002] Alkaline aqueous solution electrolysis hydrogen production technology is a mature and widely used technology with high efficiency and low cost. The main materials used include diaphragm, metal alloy electrode and KOH electrolyte. The principle is to use alkaline water electrolysis cell to generate H at the cathode by electrolyzing water. 2 , the anode produces O 2 In this process, the two gases need to be separated, otherwise H 2 and O 2 Mixing, this will not only fail to produce H 2 The purpose of the diaphragm is to connect H 2 and O 2 The key material for separation is to ensure that hydrogen and oxygen molecules cannot pass through the diaphragm, but allow electrolyte ions to pass through. The performance of the diaphragm not only affects the purity of the prepared gas but also has a great impact on the energy consumption of the electrolyzer. The ideal diaphragm material should have the following characteristics: good ion conductivity, high porosity, low resistivity; high gas barrier, high hydrophilicity, high corrosion resistance; thin thickness, small pore size, high mechanical strength, good dimensional stability; low cost, long service life, etc.

[0003] PPS (polyphenylene sulfide) diaphragm, also known as fabric diaphragm, is a diaphragm cloth made of polyphenylene sulfide fiber through weaving, spunlace and other processes. It can maintain stable performance under alkaline conditions and high temperature conditions. Therefore, it is widely used to prepare alkaline hydrogen production diaphragms and is also the mainstream diaphragm for alkaline water electrolysis hydrogen production. Due to the different materials used in weaving, it is divided into short fiber yarn diaphragms and filament diaphragms. The surface of filament diaphragms is relatively flat, the strips are even, the surface hairiness is less, and the air tightness is high. Compared with short fiber diaphragms, the advantages are very obvious, but the filament tension is difficult to control during weaving, which can easily cause uneven tension, seriously affecting the air tightness of the filament diaphragm, and there are safety hazards, so that PPS filament diaphragms cannot be widely used.

[0004] In addition, the hydrophilicity of PPS fabric is too weak, resulting in excessive internal resistance of the electrolytic cell, so the PPS fabric needs to be modified to enhance its hydrophilicity. In the prior art, the hydrophilicity of PPS diaphragm is generally enhanced by post-treatment, that is, PPS diaphragm is used as the substrate, and inorganic substances are coated on the surface to ensure the mechanical properties of the diaphragm, improve the hydrophilicity of the diaphragm, improve the compatibility of the diaphragm with the electrolyte, and reduce the internal resistance of the electrolytic cell. However, the price of composite diaphragm is more than twice that of PPS diaphragm, and the high price restricts the promotion of composite diaphragm. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a hydrophilic polyphenylene sulfide staple filament composite yarn for a diaphragm, aiming to solve the problems existing in the above-mentioned background technology.

[0006] The embodiment of the present invention is implemented as follows: a hydrophilic polyphenylene sulfide staple fiber filament composite yarn for a diaphragm, the composite yarn having an English count of 10-20S, which is made by composite spinning of hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments;

[0007] Wherein, the hydrophilic polyphenylene sulfide staple fiber has a fineness of 0.89-6.67 dtex and a length of 38-51 mm;

[0008] The fineness of the hydrophilic polyphenylene sulfide filaments is 66-444 dtex.

[0009] Another object of an embodiment of the present invention is to provide a spinning method for hydrophilic polyphenylene sulfide staple fiber filament composite yarn for diaphragm, comprising the following steps: subjecting the hydrophilic polyphenylene sulfide staple fibers to a curing process, a cleaning process, a carding process, a drawing process, and a roving process to make hydrophilic polyphenylene sulfide staple fiber roving, and then subjecting the hydrophilic polyphenylene sulfide staple fiber roving and the hydrophilic polyphenylene sulfide filaments to a spinning process and a winding process.

[0010] Preferably, the curing step comprises: mixing water, an antistatic agent, and crude oil, spraying the mixture on the hydrophilic polyphenylene sulfide staple fibers, and placing the mixture in an environment of 25-30° C. and 55%-65% humidity for 24 hours, wherein the mass ratio of the hydrophilic polyphenylene sulfide staple fibers to water, the antistatic agent, and the crude oil is 1:0.08:0.04:0.015.

[0011] Preferably, the steps of the cotton cleaning process are specifically: the cured hydrophilic polyphenylene sulfide staple fibers are sequentially passed through a disc plucking machine, a multi-bin cotton blending machine, a vertical baling machine, a disc plucking machine, a multi-bin cotton blending machine, a combing needle cotton opening machine, a vibrating cotton box feeding machine, and a cotton combing machine for cotton cleaning.

[0012] Preferably, the steps of the carding process are specifically as follows: during carding, the rotation speeds of the cylinder and the doffer are increased to increase the sliver quantity and reduce the sliver output speed to obtain the sliver.

[0013] Preferably, the steps of the drawing process and the roving process are specifically as follows: the raw sliver is made into ready sliver by two-pass drawing and then made into roving, the ambient humidity of the drawing process is 45%-55%, and the twist of the roving process is controlled to be 15% larger.

[0014] Preferably, the steps of the spinning process and the winding process are specifically as follows: a siro compact spinning device is added to the spinning process, and coarse yarn made of hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments are compositely spun on a siro compact spinning machine to form short fiber-filament composite tube yarn, which is then made into tube yarn to obtain the hydrophilic polyphenylene sulfide short fiber-filament composite yarn for the diaphragm.

[0015] The embodiment of the present invention provides a hydrophilic polyphenylene sulfide staple fiber and hydrophilic polyphenylene sulfide filament composite yarn for a diaphragm, wherein hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments are compositely spun to achieve complementary advantages of filaments and staple fibers, which can enhance the hydrophilicity of the finished diaphragm on the one hand, and improve the yarn evenness of the staple fiber and reduce the yarn hairiness on the other hand, thereby improving the strength, air tightness and practical performance of the finished diaphragm, and at the same time, avoid the problem of difficult control of tension in the manufacture of polyphenylene sulfide filaments, unstable air tightness and other safety hazards, and the yarn manufactured by the embodiment of the present invention has the characteristics of uniform evenness, less hairiness, high strength, stable weaving tension, high production efficiency, etc.

[0016] The diaphragm made of this yarn has the characteristics of good hydrophilicity, few diaphragm defects, high yield, high air tightness, strong ion permeability, low resistance and long service life. The service life of the diaphragm is increased by 15%-20%, and the diaphragm resistance is reduced by 10%-15%, which can help alkaline water electrolysis hydrogen production enterprises to reduce costs and increase efficiency. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] A hydrophilic polyphenylene sulfide staple fiber composite yarn for a diaphragm is prepared by using hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments. The hydrophilic polyphenylene sulfide staple fibers have a specification of 0.89-6.67 dtex*38-51 mm, and the hydrophilic polyphenylene sulfide filaments have a specification of 66-444 dtex. The spinning method comprises the following steps:

[0019] (1) Health of hydrophilic polyphenylene sulfide staple fibers: 8% water with an equal fiber mass fraction, 4% antistatic agent, and 1.5% crude oil are uniformly mixed and sprayed on the hydrophilic polyphenylene sulfide staple fibers through an atomizer, and placed in a crude oil bin at a temperature of 25-30°C and a humidity of 55%-65% for 24 hours to improve the spinnability of the hydrophilic polyphenylene sulfide staple fibers;

[0020] (2) Blowing process: the hydrophilic polyphenylene sulfide staple fibers after curing are passed through a disc plucker → FA022-6 multi-bin blender → vertical baler → disc plucker → multi-bin blender → combing needle opener → vibrating cotton box feeder → combing machine;

[0021] (3) Combing process: The combing process of hydrophilic polyphenylene sulfide staple fibers needs to follow the process principle of "large gauge, large quantity, and slow speed", appropriately increase the speed of the cylinder and doffer, increase the quantity of the raw sliver, and reduce the speed of the sliver;

[0022] (4) Drawing process: The drawing process uses two steps of drawing. Compared with ordinary polyphenylene sulfide fibers, hydrophilic polyphenylene sulfide staple fibers are more prone to entanglement, sticking, and eye blocking. In addition to health treatment of the raw materials, the smoothness and softness of the fibers are improved. In the drawing process, the rollers and rubber rollers need to be treated with antistatic treatment, and the ambient humidity should be reduced to 45%-55%.

[0023] (5) Roving process: The roving process is controlled with a low quantitative control, the twist is controlled to be about 15% larger, and the roving is wound around the duck's foot three times;

[0024] (6) Spinning process: A sirofil spinning device is installed in the spinning process, and the hydrophilic polyphenylene sulfide staple fiber roving enters the four-roller drafting and gathering area through the bell mouth, and is output by the output roller after passing through the drafting area and the gathering area; a filament bracket and a built-in aluminum tube are installed above the spinning frame, and the filament is placed on the bracket. After being unwound by the built-in aluminum tube, it passes through a tension device, an unwinding rubber roller, and a tension compensation and position control device (existing technology), and is fed to the rear end of the output roller with a fixed spacing of 3-4 mm from the roving. After being output, it is twisted with the staple whiskers to form a polyphenylene sulfide staple fiber filament composite yarn;

[0025] (7) Winding process: The winding process strictly controls the long thin sections and long thick sections to avoid the problems of missing or excess yarns that may exist in the spinning process, ensure that the yarn channel is smooth, avoid scratching, and reduce the generation of hairiness.

[0026] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] Embodiment 1: A hydrophilic polyphenylene sulfide short fiber filament composite yarn for a diaphragm, wherein the spinning method comprises the following steps:

[0028] (1) Polyphenylene sulfide staple fiber filament composite yarn, the yarn count is 20Ne, the hydrophilic polyphenylene sulfide staple fiber specification is 1.56dtex*38mm, and the hydrophilic polyphenylene sulfide filament specification is 111dtex;

[0029] (2) The process flow is:

[0030]

[0031] (3) Process of each process:

[0032] Blow-drying: The equipment configuration is FA002A disc plucker → FA022-6 multi-bin cotton mixer → ZF1102A needle opener → FA046A vibrating cotton box feeder; the main process parameters are: ZFA1102A needle beater speed 600rpm, roller and needle beater spacing 12mm, comprehensive beater speed 700rpm;

[0033] Carding: FA224D carding machine is used, equipped with a fully fixed flat plate. The main process parameters are: sliver weight 25g / 5m, sliver delivery speed 50m / min, cylinder speed 300rpm, licker-in speed 564rpm, flat plate speed 195mm / min, cylinder and flat plate spacing 9 / 8 / 8 / 8 / 9 (1inch‰);

[0034] Drawing: The drawing process adopts two draws, and the number of draws is six. The equipment is JWF1310 drawing frame (one draw) → RSB-D22C drawing frame (final draw). The main process parameters are: the first draw is 25g / 5m, the total draft is 6.0 times, the rear draft is 1.75 times, the roller gauge (front zone × rear zone) is 10×20mm, and the strip speed is 350m / min; the final draw is 6, the weight is 25g / 5m, the total draft is 6.0 times, the rear draft is 1.3 times, the roller gauge (front zone × rear zone) is 13.5×22mm, and the strip speed is 350m / min.

[0035] Roving: The roving process is produced by FA497 roving machine, and the main process parameters are: roving weight 7g / 10m, twist 2.7 twist / 10cm, total draft 7.14 times, rear draft 1.19 times, roller gauge (front

[0036] × middle × rear) 11 × 26 × 36mm, jaw spacing block 7mm, spindle speed 700rpm;

[0037] Spinning: The spinning process is produced on a JWF1510 four-roller Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving and the hydrophilic polyphenylene sulfide filament are composite spun on the Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving enters the four-roller drafting and gathering area through the bell mouth, and is output by the output roller after passing through the drafting area and the gathering area; a filament bracket and a built-in aluminum tube are installed above the spinning frame, and the filament is placed on the bracket. After being unwound from the built-in aluminum tube, it passes through the tension device, unwinding rubber roller, tension compensation and positioning. A control device is installed (refer to the prior art), and the yarn is fed at the rear end of the output roller at a fixed distance of 3 to 4 mm from the roving, and twisted with the staple fiber strips after output to form a polyphenylene sulfide staple filament composite yarn; the main process parameters are: yarn count 20Ne in English, total drafting multiple 40.9 times, rear zone drafting multiple 1.212 times, jaw spacing block 5.0mm, twist 30 twists / 10cm, roller spacing (front×rear) 20×40mm, special-shaped tube negative pressure of about 45mbar, spindle speed 12000rpm;

[0038] Winding: SAVIO Polar L-type automatic winder was used for production, with a winding speed of 600 m / min and electronic yarn clearer channel settings as follows: N: 5.8, DS×LS: 3.3×3.4, DL×LL: 1.4×14, -D×-L: -18%×10.

[0039] The composite yarn obtained by spinning in Example 1 was made into a diaphragm according to the prior art, and compared with the ordinary PPS short fiber diaphragm, the relevant performance data were shown in Table 1:

[0040] Table 1

[0041]

[0042]

[0043] Embodiment 2: A hydrophilic polyphenylene sulfide short fiber filament composite yarn for a diaphragm, wherein the spinning method comprises the following steps:

[0044] (1) Polyphenylene sulfide staple fiber filament composite yarn, the yarn count is 16Ne, the hydrophilic polyphenylene sulfide staple fiber specification is 2.22dtex*51mm, and the hydrophilic polyphenylene sulfide filament specification is 222dtex;

[0045] (2) The process flow is:

[0046]

[0047] (3) Process of each process:

[0048] Blow-drying: The equipment configuration is FA002A disc plucker → FA022-6 multi-bin cotton mixer → ZF1102A needle opener → FA046A vibrating cotton box feeder; the main process parameters are: ZFA1102A needle beater speed 600rpm, roller and needle beater spacing 12mm, comprehensive beater speed 700rpm;

[0049] Carding: FA224D carding machine is used, equipped with a fully fixed flat plate. The main process parameters are: sliver weight 25g / 5m, sliver delivery speed 50m / min, cylinder speed 300rpm, licker-in speed 564rpm, flat plate speed 195mm / min, cylinder and flat plate spacing 10 / 9 / 9 / 9 / 10 (1inch‰);

[0050] Drawing: The drawing process adopts two draws, and the number of draws is six. The equipment is JWF1310 drawing frame (one draw) → RSB-D22C drawing frame (final draw). The main process parameters are: the first draw is 25g / 5m, the total draft is 6.0 times, the rear draft is 1.75 times, the roller gauge (front zone × rear zone) is 10×20mm, and the strip speed is 350m / min; the final draw is 6, the weight is 23g / 5m, the total draft is 6.52 times, the rear draft is 1.3 times, the roller gauge (front zone × rear zone) is 23.5×32mm, and the strip speed is 350m / min.

[0051] Roving: The roving process is produced by FA497 roving machine, and the main process parameters are: roving quantity 6.5g / 10m, twist 3.0 twist / 10cm, total draft 7.08 times, rear draft 1.19 times, roller gauge (front

[0052] ×, remove the second roller) 50×60mm, jaw spacing block 7mm, spindle speed 800rpm;

[0053] Spinning: The spinning process is produced on a JWF1510 four-roller Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving and the hydrophilic polyphenylene sulfide filament are composite spun on the Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving enters the four-roller drafting and gathering area through the bell mouth, and is output by the output roller after passing through the drafting area and the gathering area; a filament bracket and a built-in aluminum tube are installed above the spinning frame, and the filament is placed on the bracket. After being unwound from the built-in aluminum tube, it passes through the tension device, unwinding rubber roller, tension compensation and positioning. A control device is installed (refer to the prior art), and the yarn is fed at the rear end of the output roller at a fixed distance of 3 to 4 mm from the roving, and twisted with the staple fiber strips after output to form a polyphenylene sulfide staple filament composite yarn; the main process parameters are: yarn count 16Ne in English, total drafting multiple 47.6 times, rear zone drafting multiple 1.136 times, jaw spacing block 5.0mm, twist 30 twists / 10cm, roller spacing (front×rear) 26×41mm, special-shaped tube negative pressure of about 45mbar, spindle speed 12000rpm;

[0054] Winding: SAVIO Polar L-type automatic winder was used for production, with a winding speed of 600 m / min and electronic yarn clearer channel settings as follows: N: 5.8, DS×LS: 3.4×3.5, DL×LL: 1.4×14, -D×-L: -18%×10.

[0055] The composite yarn obtained by spinning in Example 2 was made into a diaphragm according to the prior art, and compared with the ordinary PPS short fiber diaphragm, the relevant performance data were obtained as shown in Table 2:

[0056] Table 2

[0057]

[0058]

[0059] Embodiment 3: A hydrophilic polyphenylene sulfide short fiber filament composite yarn for a diaphragm, wherein the spinning method comprises the following steps:

[0060] (1) Polyphenylene sulfide staple fiber composite yarn, the yarn count is 10Ne, the hydrophilic polyphenylene sulfide staple fiber specification is 0.89dtex*51mm, and the hydrophilic polyphenylene sulfide filament specification is 333dtex;

[0061] (2) The process flow is:

[0062]

[0063] (3) Process of each process:

[0064] Blow-drying: The equipment configuration is FA002A disc plucker → FA022-6 multi-bin cotton mixer → ZF1102A needle opener → FA046A vibrating cotton box feeder; the main process parameters are: ZFA1102A needle beater speed 600rpm, roller and needle beater spacing 12mm, comprehensive beater speed 700rpm;

[0065] Carding: FA224D carding machine is used, equipped with a fully fixed flat plate. The main process parameters are: sliver weight 30g / 5m, sliver delivery speed 50m / min, cylinder speed 300rpm, licker-in speed 564rpm, flat plate speed 195mm / min, cylinder and flat plate spacing 8 / 7 / 7 / 7 / 8 (1inch‰);

[0066] Drawing: The drawing process adopts two draws, and the number of draws is six. The equipment is JWF1310 drawing frame (one draw) → RSB-D22C drawing frame (final draw). The main process parameters are: the first draw is 25g / 5m, the total draft is 7.2 times, the rear draft is 1.75 times, the roller gauge (front zone × rear zone) is 10×20mm, and the strip speed is 350m / min; the final draw is 6, the weight is 25g / 5m, the total draft is 5.98 times, the rear draft is 1.3 times, the roller gauge (front zone × rear zone) is 23.5×32mm, and the strip speed is 350m / min.

[0067] Roving: The roving process is produced by FA497 roving machine, and the main process parameters are: roving quantity 8.0g / 10m, twist 2.1 twist / 10cm, total draft 6.25 times, rear draft 1.19 times, roller gauge (front

[0068] ×, remove the second roller) 50×60mm, jaw spacing block 8mm, spindle speed 600rpm;

[0069] Spinning: The spinning process is produced on a JWF1510 four-roller Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving and the hydrophilic polyphenylene sulfide filament are composite spun on the Siro compact spinning spinning frame. The hydrophilic polyphenylene sulfide staple fiber roving enters the four-roller drafting and gathering area through the bell mouth, and is output by the output roller after passing through the drafting area and the gathering area; a filament bracket and a built-in aluminum tube are installed above the spinning frame, and the filament is placed on the bracket. After being unwound from the built-in aluminum tube, it passes through the tension device, unwinding rubber roller, tension compensation and positioning. A control device is installed (refer to the prior art), and the yarn is fed at the rear end of the output roller at a fixed distance of 3 to 4 mm from the roving, and twisted with the staple fiber strips after output to form a polyphenylene sulfide staple filament composite yarn; the main process parameters are: yarn count 10Ne in English, total drafting multiple 33.4 times, back zone drafting multiple 1.212 times, jaw gauge block 6.0mm, twist 24 twists / 10cm, roller gauge (front×back) 26×41mm, special-shaped tube negative pressure about 52mbar, spindle speed 10500rpm;

[0070] Winding: SAVIO Polar L-type automatic winder was used for production, with a winding speed of 600 m / min and electronic yarn clearer channel settings as follows: N: 6.0, DS×LS: 3.5×3.6, DL×LL: 1.4×14, -D×-L: -18%×10.

[0071] The composite yarn obtained by spinning in Example 3 was made into a diaphragm according to the prior art, and compared with the ordinary PPS short fiber diaphragm, the relevant performance data were obtained as shown in Table 3:

[0072] Table 3

[0073]

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrophilic polyphenylene sulfide staple filament composite yarn for a diaphragm, characterized in that: The composite yarn has an imperial count of 10-20S, and is made by spinning a composite yarn of hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments; Wherein, the hydrophilic polyphenylene sulfide staple fiber has a fineness of 0.89-6.67 dtex and a length of 38-51 mm; The fineness of the hydrophilic polyphenylene sulfide filaments is 66-444 dtex.

2. A spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm as claimed in claim 1, characterized in that: The following steps are involved: The hydrophilic polyphenylene sulfide staple fibers are processed through curing, cleaning, carding, drawing and roving processes to produce hydrophilic polyphenylene sulfide staple fiber rovings, and then the hydrophilic polyphenylene sulfide staple fiber rovings and hydrophilic polyphenylene sulfide filaments are processed through spinning and winding processes.

3. The spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm according to claim 2, characterized in that: The curing step specifically comprises: mixing water, an antistatic agent, and crude oil and spraying the mixture on the hydrophilic polyphenylene sulfide staple fibers by atomization, and placing the mixture for 24 hours in an environment with a temperature of 25-30° C. and a humidity of 55%-65%, wherein the mass ratio of the hydrophilic polyphenylene sulfide staple fibers to the water, the antistatic agent, and the crude oil is 1:0.08:0.04:0.

015.

4. The spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm according to claim 3, characterized in that: The steps of the cotton cleaning process are specifically as follows: the cured hydrophilic polyphenylene sulfide staple fibers are sequentially passed through a disc plucker, a multi-bin cotton mixer, a vertical baler, a disc plucker, a multi-bin cotton mixer, a combing needle opener, a vibrating cotton box feeder, and a combing machine for cotton cleaning.

5. The spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm according to claim 4, characterized in that: The steps of the carding process are specifically as follows: during carding, the rotation speeds of the cylinder and the doffer are increased, the sliver quantity is increased, and the sliver output speed is reduced to obtain the sliver.

6. The spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm according to claim 5, characterized in that: The steps of the drawing process and the roving process are specifically as follows: the raw sliver is drawn in two steps to make ready sliver, and then made into roving, the ambient humidity of the drawing process is 45%-55%, and the twist of the roving process is controlled to be 15% larger.

7. The spinning method of the hydrophilic polyphenylene sulfide short fiber and long fiber composite yarn for diaphragm according to claim 6, characterized in that: The steps of the spinning process and the winding process are specifically as follows: a siro compact spinning device is added to the spinning process, and coarse yarn made of hydrophilic polyphenylene sulfide staple fibers and hydrophilic polyphenylene sulfide filaments are compositely spun on a siro compact spinning machine to form a short fiber-filament composite tube yarn, which is then made into a tube yarn to obtain the hydrophilic polyphenylene sulfide short fiber-filament composite yarn for the diaphragm.

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