Acrylic fiber as well as preparation method and application thereof

Abstract

The invention relates to the technical field of fibers, and particularly discloses an acrylic fiber and a preparation method and application thereof. The preparation method of the acrylic fiber provided by the invention comprises the following steps: spinning and forming, washing and drawing, oiling, drying, curling and shaping. An acrylic fiber spinning oil agent is applied to the tows subjected to water washing and traction, and the adding amount of the acrylic fiber spinning oil agent accounts for 0.22-0.54% of the total weight of the tows; the acrylic fiber spinning oil agent is prepared from the following components in parts by weight: 20 to 30 parts of polyoxyethylene stearate, 12 to 20 parts of emulsifier SOPE-10, 10 to 20 parts of iso-tridecanol polyoxyethylene ether sodium sulfate, 20 to 30 parts of castor oil / IPDI copolymer, 6 to 15 parts of polyoxyethylene sorbitan monooleate and 0 to 10 parts of alkyl phenyl phosphorothioate. The invention also provides the acrylic fiber obtained by the preparation method. According to the preparation method of the acrylic fiber, the surface roughness and the softness of the acrylic fiber can be improved, and the acrylic fiber with good smoothness and good softness is obtained.

Description

Technical Field

[0001] The present application relates to the field of fiber technology, and in particular to an acrylic fiber and a preparation method and application thereof. Background Art

[0002] As an important synthetic fiber, acrylic is widely used in the production of strong ropes, bulletproof vests, fishing lines and other products due to its good acid and alkali resistance, strong weather resistance, high strength and elasticity, and excellent heat resistance. However, acrylic fiber has a high hardness and is prone to fuzzing during the spinning process, so spinning oil is often used to improve its lubrication properties.

[0003] Traditional spinning oils mostly use a single surfactant, which can improve certain properties of the fiber to a certain extent, but the overall effect is not good. In recent years, the market has mostly used composite oils made of mineral oil or synthetic oil as the base oil, and a certain amount of antistatic agent, lubricant and other auxiliary ingredients as acrylic spinning oils, but the above oils are easy to volatilize during high-temperature spinning, resulting in unstable fiber performance, and the effect of the above oils in improving the softness of acrylic fibers and the processing silk rate still needs to be improved. Summary of the invention

[0004] In order to improve the smoothness and softness of acrylic fiber, the present application provides an acrylic fiber and a preparation method and application thereof.

[0005] In a first aspect, the present application provides a method for preparing acrylic fiber, using the following technical solution: A method for preparing acrylic fiber, comprising the following steps: spinning, washing, drawing, oiling, drying, curling and shaping; Oiling: applying acrylic spinning oil to the washed and drawn tow, wherein the amount of acrylic spinning oil added is 0.22-0.54% of the total weight of the tow; The acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 10-20 parts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate, 20-30 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, and 0-10 parts of alkylphenyl thiophosphate.

[0006] The present application provides a method for preparing acrylic fiber. The above-mentioned preparation method uses an acrylic spinning oil to oil the bundled yarn after washing and traction. On the one hand, it gives the acrylic fiber good softness, which can be comparable to the softness of natural cotton; on the other hand, it can also reduce the friction coefficient of the fiber surface, improve the smoothness of the acrylic fiber, and reduce the lint rate of the acrylic fiber in the subsequent processing process. Therefore, the acrylic fiber prepared by the preparation method of acrylic fiber provided by the present application has the advantages of good smoothness, good softness, low processing lint rate, etc., and can be widely used in the production of products such as strong ropes, bulletproof vests, fishing lines, etc., and has a good prospect of use.

[0007] In the acrylic spinning oil used in the present application, polyoxyethylene stearate and polyoxyethylene sorbitan monooleate belong to nonionic surfactants, both of which have good lubricity, can reduce the friction between fibers, make the fibers easier to slide in the subsequent processing process, thereby reducing the silk rate of fiber processing; in addition, polyoxyethylene stearate and polyoxyethylene sorbitan monooleate also have good antistatic effect, can reduce the accumulation of static charge on the fiber surface, and prevent the fibers from sticking or producing other adverse effects due to static electricity. Isomeric tridecanol polyoxyethylene ether sodium sulfate is an anionic surfactant that can reduce the surface roughness of the fiber, improve the smoothness and comfort of the fiber, thereby giving the fiber a soft and smooth feel. Castor oil / IPDI copolymer can increase the softness and wear resistance of the fiber, thereby improving the fiber processing performance. Alkylphenyl thiophosphate has good lubricity and wear resistance. On the one hand, it can reduce the friction between the fibers and improve the softness of the fibers. On the other hand, it can alleviate the damage caused by friction, reduce the silk rate of fiber processing, and improve the processing performance of the fiber.

[0008] Optionally, the acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 12-17 parts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate, 23-28 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, and 3-8 parts of alkylphenyl thiophosphate.

[0009] In the acrylic spinning oil used in this application, the amount of each component will affect the softness and smoothness of the acrylic fiber. This application has found through experimental research that by further controlling the weight of isotridecyl polyoxyethylene ether sodium sulfate, castor oil / IPDI copolymer and alkylphenyl thiophosphate within the above range, the obtained acrylic fiber has better smoothness and softness, and the silk rate in the subsequent processing process is lower.

[0010] In some embodiments, the weight proportion of the isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate can be 10-12 parts, 10-15 parts, 10-17 parts, 10-30 parts, 12-15 parts, 12-17 parts, 12-20 parts, 15-17 parts, 15-20 parts or 17-20 parts.

[0011] In a specific embodiment, the weight proportion of the isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate can also be 10 parts, 12 parts, 15 parts, 17 parts or 20 parts.

[0012] In some embodiments, the castor oil / IPDI copolymer may be present in an amount of 20-23, 20-25, 20-28, 20-30, 23-25, 23-28, 23-30, 25-28, 25-30, or 28-30 parts by weight.

[0013] In a specific embodiment, the weight parts of the castor oil / IPDI copolymer can also be 20 parts, 23 parts, 25 parts, 28 parts or 30 parts.

[0014] In some embodiments, the castor oil / IPDI copolymer may be present in an amount of 20-23, 20-25, 20-28, 20-30, 23-25, 23-28, 23-30, 25-28, 25-30, or 28-30 parts by weight.

[0015] In a specific embodiment, the weight parts of the castor oil / IPDI copolymer can also be 20 parts, 23 parts, 25 parts, 28 parts or 30 parts.

[0016] In some embodiments, the weight proportion of the alkylphenyl thiophosphate may be 0-3 parts, 0-5 parts, 0-8 parts, 0-10 parts, 3-5 parts, 3-8 parts, 3-10 parts, 5-8 parts, 5-10 parts or 8-10 parts.

[0017] In a specific embodiment, the weight proportion of the alkylphenyl thiophosphate can also be 0 parts, 3 parts, 5 parts, 8 parts or 10 parts.

[0018] Optionally, the acrylic spinning oil is added in an amount of 0.31-0.43% of the total mass of the filament bundle.

[0019] In the present application, the amount of acrylic spinning oil added affects the softness and smoothness of the fiber. As the amount of acrylic spinning oil added increases, the softness of the obtained tow shows a trend of first increasing and then decreasing, and the dynamic friction coefficient shows a trend of first decreasing and then increasing. Therefore, taking all factors into consideration, the present application further controls the amount of acrylic spinning oil added within the above range, so as to obtain acrylic fibers with excellent softness and smoothness.

[0020] In some embodiments, the acrylic spinning oil may be added in an amount of 0.22-0.31%, 0.22-0.38%, 0.22-0.43%, 0.22-0.54%, 0.31-0.38%, 0.31-43%, 0.31-0.54%, 0.38-0.43%, 0.38-0.54% or 0.43-0.54% of the total mass of the filament bundle.

[0021] In a specific embodiment, the acrylic spinning oil may be added in an amount of 0.22%, 0.31%, 0.38%, 0.43% or 0.54% of the total mass of the filament bundle.

[0022] Optionally, the acrylic spinning oil is heated and melted at 70-80°C before use, and then prepared into an aqueous solution with a mass concentration of 2-7% and injected into a spinning oil tank; during the oiling process, the temperature in the oil tank is maintained at 70-75°C.

[0023] Optionally, the drying temperature is 150-160°C.

[0024] In a second aspect, the present application provides an acrylic fiber obtained by a method for preparing acrylic fiber.

[0025] In a third aspect, the present application provides applications of acrylic fibers in strong ropes, bulletproof vests, and fishing lines.

[0026] In summary, this application has the following beneficial effects: 1. The present application provides a method for preparing acrylic fiber, which uses an acrylic spinning oil prepared from components such as sodium isotridecyl polyoxyethylene ether sulfate, castor oil / IPDI copolymer, and polyoxyethylene sorbitan monooleate to oil the yarn bundles, thereby significantly improving the surface roughness and softness of the prepared acrylic fiber, thereby obtaining acrylic fiber with high smoothness and good flexibility. The acrylic fiber can be widely used in the production of products such as high-strength ropes, bulletproof vests, and fishing lines, and has a good prospect for use.

[0027] 2. The present application further adds alkylphenyl thiophosphate to the acrylic spinning oil, and controls the addition amount of alkylphenyl thiophosphate within the range of 3-8 parts. The obtained acrylic fiber surface is smoother and softer, and its pressurized thickness change rate A1 is greater than 70%, the residual thickness change rate A2 after pressure relief is less than 15%, and the dynamic friction coefficient is less than 0.32.

[0028] 3. Through experimental research, the present application found that by controlling the addition amount of acrylic spinning oil to be within the range of 0.31-0.43% of the total weight of the tow, the friction coefficient of the obtained acrylic fiber is lower and the softness is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of the method for preparing acrylic fiber provided in this application. DETAILED DESCRIPTION

[0030] (1) Spinning: Using polyacrylonitrile dry powder as raw material and dimethylacetamide as solvent, a polymer emulsion with a mass concentration of 20-30% is prepared, the polymer emulsion is heated to 90-100°C, and extruded from the shaped spinneret holes on the spinneret to form monofilaments, which are then formed into primary fibers through double diffusion in a coagulation bath; wherein the weight ratio of acrylonitrile to vinyl acetate in the polyacrylonitrile dry powder is (92-94):(6-8).

[0031] (2) Washing and drawing: The spun fibers are washed and then drawn by a drawing machine. The water tank temperature during washing is 70-90°C, the drawing speed of the drawing machine is 30-60 m / min, and the drawing multiple is 3-5 times.

[0032] (3) Oiling: (3-1) preparing an acrylic spinning oil according to the following ratio, heating and melting it at 70-80° C., and then preparing an aqueous solution with a mass concentration of 2-7% and injecting it into a spinning oil tank; Wherein, the acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 10-20 parts of isomeric tridecanol polyoxyethylene ether sulfate sodium, 20-30 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, 0-10 parts of alkylphenyl thiophosphate and 5-15 parts of water. Further, the acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 12-17 parts of isomeric tridecanol polyoxyethylene ether sulfate sodium, 23-28 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, 3-8 parts of alkylphenyl thiophosphate and 5-15 parts of water.

[0033] (3-2) Applying acrylic spinning oil to the washed and drawn filament bundle, maintaining the temperature in the oil tank at 70-75° C. during the oiling process, and adding 0.22-0.54% of the total weight of the filament bundle; further, adding 0.31-0.43% of the total weight of the filament bundle.

[0034] (4) Drying: The oiled filaments are dried at 150-160°C using a hot drying roller.

[0035] (5) Curling and shaping: The dried filament bundle is cooled and curled, and then sent into a shaping pot for heat shaping treatment at 130-140°C and 20-60KPa to produce acrylic fiber.

[0036] In the present application, the model of polyoxyethylene stearate is SG-6; the emulsifier SOPE-10 is purchased from Haian Sensheng Chemical Co., Ltd.; the model of isomeric tridecyl polyoxyethylene ether sodium sulfate is emulsifier E-1310SA; castor oil / IPDI copolymer is purchased from Guangzhou Naibo Biotechnology Co., Ltd.; polyoxyethylene sorbitan monooleate is polysorbate-80; the model of alkylphenyl thiophosphate is E1412, purchased from Hangzhou Shitean Chemical Co., Ltd.; the remaining raw materials, reagents, solvents, etc. of the present application can be obtained commercially.

[0037] The present application is further described in detail below in combination with preparation examples, embodiments, performance testing experiments and accompanying drawings. Preparation Example 1-9

[0038] Preparation Examples 1-9 each provide an acrylic spinning oil.

[0039] The difference between the above preparation examples is that the addition amounts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate and castor oil / IPDI copolymer in the acrylic spinning oil are specifically shown in Table 1 below.

[0040] The preparation method of the acrylic spinning oil provided in Preparation Example 1-9 comprises the following steps: 25 g of polyoxyethylene stearate, 15 g of emulsifier SOPE-10, sodium sulfate of isomeric tridecyl alcohol polyoxyethylene ether, castor oil / IPDI copolymer, 10 g of polyoxyethylene sorbitan monooleate and 10 g of water are weighed respectively, mixed evenly, stirred and heated to 60°C for full compounding, and cooled to obtain a flat acrylic spinning oil.

[0041] Table 1 Addition amount of some components in the acrylic spinning oil provided in Preparation Examples 1-9 Preparation Example 10-13

[0042] Preparation Examples 10-13 each provide an acrylic spinning oil.

[0043] The difference between the above Preparation Example and Preparation Example 3 is that the acrylic spinning oil further comprises alkylphenyl thiophosphate, and the addition amount of alkylphenyl thiophosphate is shown in Table 2.

[0044] Table 2 Addition amount of alkylphenyl thiophosphate in acrylic spinning oil of Preparation Examples 10-13 Comparative Preparation Example 1

[0045] Comparative Preparation Example 1 provides an acrylic spinning oil.

[0046] The difference between the comparative preparation example and the preparation example 3 is that the addition amount of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate in the acrylic spinning oil is 0. Comparative Preparation Example 2

[0047] Comparative Preparation Example 2 provides an acrylic spinning oil.

[0048] The difference between the comparative preparation example and the preparation example 3 is that the addition amount of the castor oil / IPDI copolymer in the acrylic spinning oil is 0. Comparative Preparation Example 3

[0049] Comparative Preparation Example 3 provides an acrylic spinning oil.

[0050] The difference between the comparative preparation example and the preparation example 3 is that the castor oil / IPDI copolymer is replaced by polyoxyethylene ricinoleate. Comparative Preparation Example 4

[0051] Comparative Preparation Example 4 provides an acrylic spinning oil.

[0052] The difference between the above comparative preparation example and preparation example 3 is that the isomeric tridecanol polyoxyethylene ether sodium sulfate is replaced by fatty alcohol polyoxyethylene ether sodium sulfate. Examples 1-13

[0053] Examples 1-13 respectively provide a method for preparing acrylic fiber.

[0054] The difference between the above embodiments is that the acrylic spinning oil used in the oiling step is derived from Preparation Examples 1-13 respectively.

[0055] The preparation method of acrylic fiber provided in Examples 1-13 is as follows: Figure 1 As shown, the following steps are included: (1) Spinning: Using polyacrylonitrile dry powder as raw material and dimethylacetamide as solvent, a polymer emulsion with a mass concentration of 20-30% is prepared, the polymer emulsion is heated to 95°C, and extruded from the shaped spinneret holes on the spinneret to form monofilaments, which are then formed into primary fibers through double diffusion in a coagulation bath; wherein the weight ratio of acrylonitrile to vinyl acetate in the polyacrylonitrile dry powder is 94:6.

[0056] (2) Washing and drawing: The spun fibers are washed and then drawn by a drawing machine. The water tank temperature during washing is 80°C, the drawing speed of the drawing machine is 50 m / min, and the drawing multiple is 4 times.

[0057] (3) Oiling: (3-1) Melting the acrylic spinning oil at 75°C, preparing a 5% aqueous solution and injecting it into the spinning oil tank; (3-2) Applying acrylic spinning oil to the washed and drawn filament bundle, maintaining the temperature in the oil tank at 75° C. during the oiling process, and adding 0.38% of the total weight of the filament bundle.

[0058] (4) Drying: The oiled filaments are dried at 155°C using a hot drying roller.

[0059] (5) Curling and shaping: The dried filament bundle is cooled and curled, and then sent into a shaping pot for heat shaping treatment at 135°C and 40KPa to produce acrylic fiber. Examples 14-17

[0060] Examples 14-17 respectively provide a method for preparing acrylic fiber.

[0061] The difference between the above embodiment and embodiment 3 is that the amount of acrylic spinning oil added is as shown in Table 3 below.

[0062] Table 3 Addition amount of acrylic spinning oil in the preparation methods of Example 3 and Examples 14-17 Comparative Examples 1-4

[0063] Comparative Examples 1-4 respectively provide a method for preparing acrylic fiber.

[0064] The difference between the above comparative example and Example 3 is that the acrylic spinning oil used in the oiling step is derived from comparative preparation examples 1-4 respectively. Comparative Example 5

[0065] Comparative Example 5 provides a method for preparing acrylic fiber.

[0066] The difference between the comparative example and Example 3 is that the amount of acrylic spinning oil added is 0.60% of the total weight of the filament bundle. Performance testing

[0067] The acrylic fibers obtained in Examples 1-17 and Comparative Examples 1-5 were subjected to performance tests, and the results are shown in Table 4 below.

[0068] (1) Softness: Mechanically comb acrylic fiber into a fiber mesh test sample with a diameter D of 50 mm and a thickness T0 of 1 cm; then place the test sample in a YG141D digital fabric thickness gauge for weighting, with a weight of 25 cN and a weighting time of 30 seconds; record the thickness T1 of the test sample after 30 seconds of weighting; then unload the pressure and rest for 5 minutes before retesting the thickness T2 of the sample. Calculate the pressure thickness change rate A1 and the thickness residual change rate A2 after unloading respectively, and the calculation formula is as follows: Pressure thickness change rate A1 = (T0-T1) / T0×100% Remaining thickness change rate after pressure relief A2 = (T0-T2) / T0×100% (2) Friction coefficient: The dynamic friction coefficient μ of acrylic fiber was tested using a Y151 fiber friction coefficient tester. Ten fibers of each type of acrylic fiber were tested in parallel and the average value was taken. Note: The smaller the friction coefficient of acrylic fiber, the lower the surface roughness of the acrylic fiber, the smoother the surface, and the lower the silkiness rate in the subsequent processing.

[0069] Table 4 Performance test results of flat acrylic fibers obtained in Examples 1-17 and Comparative Examples 1-5

[0070] According to the test results of Table 4, Examples 1-17 of the present application use an acrylic spinning oil prepared from isomeric tridecanol polyoxyethylene ether sodium sulfate, castor oil / IPDI copolymer, etc. to oil the bundles, and the amount of acrylic spinning oil added is controlled within the range of 0.22-0.54% of the total weight of the bundles. The pressurized thickness change rate A1 of the obtained acrylic fiber is 60.42-74.34%, the residual thickness change rate A2 after pressure relief is 10.34-22.46%, and the dynamic friction coefficient μ is 0.243-0.410. Therefore, it is explained that the acrylic fiber preparation method provided in the present application can prepare acrylic fibers with good smoothness and softness.

[0071] When no sodium isotridecyl polyoxyethylene ether sulfate was added to the acrylic spinning oil used in Comparative Example 1, the pressurized thickness change rate A1 of the obtained acrylic fiber was only 52.31%, the residual thickness change rate A2 after pressure relief was only 32.25%, and the dynamic friction coefficient μ was 0.478, indicating that the surface of the acrylic fiber obtained in Comparative Example 1 was rough and the softness was poor.

[0072] When castor oil / IPDI copolymer is not added to the acrylic spinning oil used in Comparative Example 2, the pressurized thickness change rate A1 of the obtained acrylic fiber is only 53.35%, the residual thickness change rate A2 after pressure relief is only 30.17%, and the dynamic friction coefficient μ is 0.453, indicating that the surface of the acrylic fiber obtained in Comparative Example 2 is rough and the softness is poor.

[0073] In Comparative Example 3, an acrylic spinning oil containing polyoxyethylene ricinoleate was used to oil the filament bundles. The pressurized thickness change rate A1 of the obtained acrylic fiber was 58.45%, the residual thickness change rate A2 after pressure relief was only 27.26%, and the dynamic friction coefficient μ was 0.434, indicating that the surface of the acrylic fiber obtained in Comparative Example 3 was rough and its softness was slightly poor.

[0074] In Comparative Example 4, an acrylic spinning oil containing sodium fatty alcohol polyoxyethylene ether sulfate was used to oil the bundle of yarns. The pressurized thickness change rate A1 of the obtained acrylic fiber was 57.23%, the residual thickness change rate A2 after pressure relief was only 28.34%, and the dynamic friction coefficient μ was 0.441, indicating that the surface of the acrylic fiber obtained in Comparative Example 4 was rough and the softness was slightly poor.

[0075] The test results of Examples 1-5 show that, with the increase in the amount of sodium sulfate of isotridecyl alcohol polyoxyethylene ether added in the acrylic spinning oil, the pressurized thickness change rate A1 of the obtained acrylic fiber shows a trend of first increasing and then remaining basically unchanged, and the residual thickness change rate A2 and the dynamic friction coefficient after pressure relief show a trend of first decreasing and then remaining basically unchanged. Therefore, taking all factors into consideration, the present application further controls the amount of sodium sulfate of isotridecyl alcohol polyoxyethylene ether added in the acrylic spinning oil to be between 12 and 17 parts, and the surface of the obtained acrylic fiber is smoother and has better softness.

[0076] The test results of Example 3 and Examples 4-9 show that, with the increase in the amount of castor oil / IPDI copolymer added in the acrylic spinning oil, the pressurized thickness change rate A1 of the obtained acrylic fiber shows a trend of first increasing and then remaining basically unchanged, and the residual thickness change rate A2 and the dynamic friction coefficient after pressure relief show a trend of first decreasing and then remaining basically unchanged. Therefore, taking all factors into consideration, the present application further controls the amount of castor oil / IPDI copolymer added in the acrylic spinning oil to between 23 and 28 parts, and the surface of the obtained acrylic fiber is smoother and softer.

[0077] From the test results of Example 3 and Examples 10-13, it can be seen that when alkylphenyl thiophosphate is also added to the acrylic spinning oil used in Examples 10-13, the pressurized thickness change rate A1 of the obtained acrylic fiber is significantly increased, and the residual thickness change rate A2 and the dynamic friction coefficient after pressure relief are significantly reduced; and with the increase in the amount of alkylphenyl thiophosphate added, the pressurized thickness change rate A1 of the obtained acrylic fiber shows a trend of first increasing and then decreasing, and the residual thickness change rate A2 and the dynamic friction coefficient after pressure relief show a trend of first decreasing and then remaining basically unchanged; among them, the pressurized thickness change rate A1 of the acrylic fiber obtained in Examples 10-12 reaches 70.25-74.34% (>70%), the residual thickness change rate A2 after pressure relief is as low as 10.37-12.46% (<15%), and the dynamic friction coefficient is only 0.243-0.318 (<0.32). Therefore, it is explained that the present application further adds alkylphenyl thiophosphate to the acrylic spinning oil, and controls the addition amount of alkylphenyl thiophosphate within the range of 3-8 parts, so that the surface of the obtained acrylic fiber is smoother and softer.

[0078] The test results of Example 3 and Examples 14-17 show that, with the increase in the amount of acrylic spinning oil added, the pressure thickness change rate A1 of the obtained acrylic fiber shows a trend of first increasing and then decreasing, and the residual thickness change rate A2 and the dynamic friction coefficient after pressure relief show a trend of first decreasing and then increasing. Therefore, the present application further controls the amount of acrylic spinning oil added to be within the range of 0.31-0.43% of the total weight of the tow, and the surface friction coefficient of the obtained acrylic fiber is lower and the softness is better.

[0079] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing acrylic fiber, characterized in that: The following steps are involved: Spinning, washing, drawing, oiling, drying, curling and shaping; Oiling: applying acrylic spinning oil to the washed and drawn tow, wherein the amount of acrylic spinning oil added is 0.22-0.54% of the total mass of the tow; The acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 10-20 parts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate, 20-30 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, and 0-10 parts of alkylphenyl thiophosphate.

2. The method for preparing acrylic fiber according to claim 1, characterized in that The acrylic spinning oil comprises the following components in parts by weight: 20-30 parts of polyoxyethylene stearate, 12-20 parts of emulsifier SOPE-10, 12-17 parts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate, 23-28 parts of castor oil / IPDI copolymer, 6-15 parts of polyoxyethylene sorbitan monooleate, and 3-8 parts of alkylphenyl thiophosphate.

3. The method for preparing acrylic fiber according to claim 1, characterized in that: The acrylic spinning oil comprises the following components in parts by weight: 25 parts of polyoxyethylene stearate, 15 parts of emulsifier SOPE-10, 15 parts of isomeric tridecyl alcohol polyoxyethylene ether sodium sulfate, 25 parts of castor oil / IPDI copolymer, 10 parts of polyoxyethylene sorbitan monooleate, and 5 parts of alkylphenyl thiophosphate.

4. The method for preparing acrylic fiber according to claim 1, characterized in that: The amount of the acrylic spinning oil added is 0.31-0.43% of the total mass of the filament bundle.

5. The method for preparing acrylic fiber according to claim 1, characterized in that: The acrylic spinning oil is heated and melted at 70-80°C before use, and then prepared into an aqueous solution with a mass concentration of 2-7% and injected into the spinning oil tank; during the oiling process, the temperature in the oil tank is maintained at 70-75°C.

6. The method for preparing acrylic fiber according to any one of claims 1 to 5, characterized in that: The drying temperature is 150-160°C.

7. An acrylic fiber obtained by the method for preparing acrylic fiber according to any one of claims 1 to 6.

8. Use of the acrylic fiber as claimed in claim 7 in strong ropes, bulletproof vests and fishing lines.

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