Yarn spreading method for carbon fibers based on ultrasound and carbon fibers

Abstract

The invention relates to the technical field of carbon fibers, in particular to a carbon fiber yarn spreading method based on ultrasound and carbon fibers, carbonized carbon fiber tows are sequentially subjected to ultrasonic concussion, extrusion and heating roller drying, and the carbon fibers are obtained. According to the yarn spreading method for the carbon fibers based on the ultrasound, the carbonized carbon fiber tows are spread and thinned through the ultrasound of the ultrasonic pool, excessive water brought by the ultrasonic pool can be extruded out of the surfaces of the carbon fiber tows through extrusion, a sizing agent on the surfaces of the carbon fiber tows is melted through heating and drying, the bonding effect between the carbon fibers is reduced, and the carbon fibers are uniformly spread; and the morphology state of the material is kept fixed and relatively unchanged. The ultrasonic-based yarn spreading method for the carbon fibers is high in production efficiency and low in cost, and the spread carbon fibers can be prepared.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fibers, and particularly relates to a method for spreading carbon fiber yarn based on ultrasound and carbon fibers. Background Art

[0002] Carbon fiber is a high-performance fiber with a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, electrical conductivity, heat transfer, shock absorption, and noise reduction. Carbon fiber composites are widely used in fields such as wind power, new energy vehicles, and sports. These fields are not sensitive to the performance of carbon fibers but are sensitive to the price of carbon fibers. Since the manufacturing cost of large tow carbon fibers is low, and their price is only 50% - 60% of that of small tow carbon fibers, in the civilian fields where carbon fiber composites are widely used, producers mostly use large tow carbon fibers. However, as the number of carbon fibers in the carbon fiber tow increases, carbon fibers are prone to phenomena such as bending and kinking. At the same time, the resin wettability of large tow carbon fibers is poor, pores are likely to appear inside the fiber bundle, the consistency of the spacing between single filaments is poor, and defects such as resin-rich areas and fiber-dense areas are likely to occur inside the composite material. On the other hand, as the diameter of the carbon fiber tow increases, in the composite material, fiber buckling and ply angle misalignment are likely to occur, resulting in a decrease in its mechanical properties and an increase in dispersion, and it cannot meet the initial design and use requirements.

[0003] Spreading yarn refers to widening and thinning the fiber bundle through a certain method while ensuring that the mechanical properties of the fiber are not damaged and no single fiber filament breaks or fuzzes occur. Spreading yarn fabric is a new product in the field of carbon fiber reinforcements. It is a biaxial carbon fiber fabric formed by crossing widened carbon fiber tows, and its surface is extremely flat. Due to its amazing flatness, spreading yarn fabric has the advantage of eliminating the texture and traces of carbon fiber weaving on the product surface and has received good evaluations in the industry. In addition to the flat and smooth outer surface of the product produced, since people have generally accepted the shape of this texture, spreading yarn carbon fiber fabric is also used in the production of carbon fiber products with unique shapes, such as the production of top models of world-famous cars, boats, and bicycles. Compared with the fabrics woven with traditional carbon yarns, spreading yarn fabrics have a small thickness, low gram weight, almost no in-plane and out-of-plane buckling. At the same time, due to the large width of the warp and weft yarns, the number of intersection points of the spreading yarn fabric per unit length is less, and the flatness of the fabric surface is further improved, ultimately improving the mechanical properties of the composite material.

[0004] Summary of the Invention

[0005] One of the purposes of the present invention is to provide a method for spreading carbon fiber yarn based on ultrasound, which can improve the widening property of carbon fiber tows and solve the problems of poor fiber buckling and dispersion of carbon fibers.

[0006] Another object of the present invention is to provide a carbon fiber with spreading characteristics.

[0007] The solution adopted by the present invention to achieve one of the objects is: a method for spreading carbon fiber yarn based on ultrasonic waves, in which the carbon fiber tow after carbonization is successively passed through ultrasonic oscillation, extrusion, and drying by a heating roller to obtain carbon fiber.

[0008] The method for spreading carbon fiber yarn based on ultrasonic waves of the present invention first makes the carbonized carbon fiber tow spread and thin through ultrasonic waves in an ultrasonic bath. Extrusion can extrude the excess water brought from the ultrasonic bath on the surface of the carbon fiber tow. Heating and drying makes the sizing agent on the surface of the carbon fiber tow melt, reducing the bonding effect between carbon fibers and keeping its morphological state relatively unchanged. The method for spreading carbon fiber yarn based on ultrasonic waves of the present invention has high production efficiency and low cost, and can obtain widened carbon fibers.

[0009] Preferably, the temperature of the heating roller is 50 - 100 °C, and the frequency of the ultrasonic bath is 100 - 120 KHz.

[0010] By making the temperature of the heating roller and the frequency of the ultrasonic rod within the above ranges, it can not only ensure that the carbon fiber tow will not break, but also make the carbon fiber tow as thin as possible.

[0011] Preferably, the specific operation of the ultrasonic oscillation is to pass the carbon fiber tow after carbonization through a spreading roller, and use an ultrasonic plate above the spreading roller to ultrasonically process the carbon fiber tow to make it spread and thin.

[0012] Ultrasonic treatment in the ultrasonic bath includes passing the carbon fiber tow through a spreading roller, and using the ultrasonic bath above the spreading roller to ultrasonically process the carbon fiber tow to make it spread and thin.

[0013] Preferably, the water outlet angle of the carbon fiber in the ultrasonic bath is 40° - 90°, and the number of spreading rollers is 6 - 16.

[0014] By making the water outlet angle within the above range, it can not only ensure that the carbon fiber tow will not break, but also make the widening effect of the carbonized carbon fiber tow reach a good threshold.

[0015] Preferably, the specific operation of the extrusion is to extrude the excess water from the carbon fiber tow that has undergone ultrasonic oscillation treatment through an extrusion roller.

[0016] Extrusion includes feeding the carbon fiber tow ultrasonically treated in the ultrasonic bath into an extrusion roller, and extruding the excess water in the carbon fiber tow by the upper extrusion.

[0017] Preferably, the surface of the extrusion roller has parallel grooves with a depth of 0.5 mm.

[0018] The groove of the present invention is for better extruding the excess water and preventing the yarn after spreading from converging significantly.

[0019] Preferably, the specific operation of drying with the heating roller is to dry the carbon fiber tow after extrusion through the heating roller to keep its fixed morphology.

[0020] Preferably, the number of tows of the carbon fiber tow is 48k.

[0021] Preferably, the following steps are further included: winding the carbon fiber after spreading through a winding bobbin, and the rotational speed of the winding bobbin motor is 100 - 600 r / min.

[0022] The solution adopted by the present invention to achieve the second object is: a carbon fiber, which is prepared by the spreading method of carbon fiber based on ultrasonic waves as described above.

[0023] The present invention has the following advantages and beneficial effects:

[0024] In the spreading method of carbon fiber based on ultrasonic waves of the present invention, the carbonized carbon fiber tow is first widened and thinned by ultrasonic waves in an ultrasonic bath, extrusion can extrude the excess water brought from the ultrasonic bath on the surface of the carbon fiber tow, and heating and drying can melt the sizing agent on the surface of the carbon fiber tow, reduce the bonding effect between carbon fibers, and keep its morphological state relatively unchanged. The spreading method of carbon fiber based on ultrasonic waves of the present invention has high production efficiency and low cost, and can produce widened carbon fibers.

[0025] The carbon fiber prepared by the method of the present invention has the characteristic of widening. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the spreading method of carbon fiber based on ultrasonic waves in an embodiment of the present application. Detailed Embodiments

[0027] The following will describe the implementation plan of the present application in detail in conjunction with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those equipment or instruments not specified in the manufacturer are all conventional products that can be obtained through commercial purchase.

[0028] The following specifically describes a carbon fiber spreading method according to an embodiment of the present application:

[0029] Please refer to Figure 1 , an embodiment of the present application provides a spreading method of carbon fiber based on ultrasonic waves, which includes the following steps:

[0030] S1. Ultrasonic wave treatment in an ultrasonic bath

[0031] In some embodiments, the number of carbon fiber winding and spreading rollers is 6 to 16.

[0032] As an example, the number of spreading rollers can be 6, 7, 10, 13, or 16.

[0033] S2. Water outlet extrusion

[0034] In some embodiments, the water outlet angle of the carbon fiber is 40° to 90°.

[0035] Optionally, the water outlet angle of the carbon fiber is 40°, 50°, 60°, 70°, 80°, or 90°.

[0036] By controlling the number of carbon fiber winding and spreading rollers and the water outlet angle of the carbon fiber within the above ranges, it is possible to ensure that the carbon fiber tow does not break and to make the carbon fiber tow after high-temperature carbonization wider and thinner.

[0037] In some embodiments, the number of tows of the carbon fiber tow is 48k.

[0038] It should be noted that the above are the specifications of the carbon fiber. The number of tows of the carbon fiber tow refers to the number of single filaments in each tow of carbon fiber, and 48k means that a tow of carbon fiber contains 48,000 raw filaments.

[0039] The widened and thinned carbon fiber tow is first immersed in the sizing solution, and the carbon fiber tow after being ultrasonically treated in the ultrasonic bath is sent into the squeezing roller, and the excess water in the carbon fiber tow is squeezed out by the upper squeezing.

[0040] S3. Drying

[0041] The carbon fiber tow after spreading is dried by a heating roller.

[0042] In some embodiments, the temperature of the heating roller is 50°C to 100°C.

[0043] As an example, the temperature of the heating roller can be 50°C, 60°C, 70°C, 80°C, 90°C, or 100°C.

[0044] The spreading method of carbon fiber based on ultrasonic waves in the present application first makes the carbon fiber tow after high-temperature carbonization wider and thinner by ultrasonic treatment in the ultrasonic bath, reduces the bonding effect between carbon fibers, and removes the excess water through the action of the squeezing roller to prevent fiber aggregation, so that the carbon fiber tow is evenly spread, and drying can remove the water in the carbon fiber. The spreading method of carbon fiber based on ultrasonic waves in the present application has high production efficiency and low cost, and can produce widened carbon fiber.

[0045] S4. Winding

[0046] The carbon fiber tow after extrusion and drying is wound by a yarn take-up reel.

[0047] In some embodiments, the rotational speed of the yarn take-up reel motor is 100 r / min to 600 r / min.

[0048] As an example, the rotational speed of the yarn take-up reel motor can be 100 r / min, 150 r / min, 300 r / min, 450 r / min, or 600 r / min.

[0049] By setting the winding speed of the yarn take-up reel within the above range, it is possible to ensure that the carbon fiber tow will not break due to vibration and, at the same time, make the carbon fiber tow as thin as possible.

[0050] The present invention also provides a carbon fiber prepared by the yarn spreading method of the carbon fiber based on ultrasound according to the above embodiments.

[0051] The carbon fiber prepared by the present invention has a spreading property.

[0052] The following further describes in detail a method for spreading carbon fiber yarn according to the present invention in conjunction with embodiments.

[0053] Example 1

[0054] This example provides a method for spreading carbon fiber yarn based on ultrasound, which includes the following steps:

[0055] S1. Ultrasonic treatment in the ultrasonic bath

[0056] Select a carbon fiber tow with high-temperature carbonization and a specification of 48k, pass the carbon fiber tow through the yarn spreading roller, and use the ultrasonic bath above the yarn spreading roller to ultrasonically spread and thin the carbon fiber tow. The number of yarn spreading rollers is 7.

[0057] S2. Extrusion after water discharge

[0058] The water discharge angle of the carbon fiber is 90°.

[0059] S3. Drying

[0060] Pass the carbon fiber tow after extrusion through the heating roller, and the temperature of the heating roller is 100 °C.

[0061] S4. Winding

[0062] Pass the carbon fiber tow after yarn spreading through the heating roller for drying, and the temperature of the heating roller is 100 °C. After drying is completed, wind and collect the yarn through the yarn take-up reel, and the rotational speed of the yarn take-up reel motor is 600 r / min.

[0063] Example 2

[0064] This example provides a method for spreading carbon fiber yarn based on ultrasound, which includes the following steps:

[0065] S1. Ultrasonic treatment in the ultrasonic bath

[0066] Select a carbon fiber tow with a high-temperature carbonized specification of 48k, pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0067] S2. Water outlet extrusion

[0068] The water outlet angle of the carbon fiber is 90°.

[0069] S3. Drying

[0070] Pass the extruded carbon fiber tow through a heating roller, and the temperature of the heating roller is 100 °C.

[0071] S4. Winding

[0072] Pass the yarn-spread carbon fiber tow through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying, wind and collect the wire through a yarn collecting disc, and the rotational speed of the yarn collecting disc motor is 600 r / min.

[0073] Example 3

[0074] This example provides a method for spreading carbon fiber based on ultrasound, which includes the following steps:

[0075] S1. Ultrasonic bath

[0076] Select a carbon fiber tow with a high-temperature carbonized specification of 48k, pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0077] S2. Water outlet extrusion

[0078] The water outlet angle of the carbon fiber is 50°.

[0079] S3. Drying

[0080] Pass the extruded carbon fiber tow through a heating roller, and the temperature of the heating roller is 100 °C.

[0081] S4. Winding

[0082] Pass the yarn-spread carbon fiber tow through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying, wind and collect the wire through a yarn collecting disc, and the rotational speed of the yarn collecting disc motor is 600 r / min.

[0083] Example 4

[0084] This example provides a method for spreading carbon fiber based on ultrasound, which includes the following steps:

[0085] S1. Ultrasonic bath

[0086] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0087] S2. Extrusion of the discharged water

[0088] The water outlet angle of the carbon fiber is 90°.

[0089] S3. Drying

[0090] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 100 °C.

[0091] S4. Winding

[0092] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying is completed, wind and collect the wire through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 600 r / min.

[0093] Example 5

[0094] This example provides a method for spreading the yarn of carbon fiber based on ultrasonic waves, which includes the following steps:

[0095] S1. Ultrasonic bath

[0096] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0097] S2. Extrusion of the discharged water

[0098] The water outlet angle of the carbon fiber is 90°.

[0099] S3. Drying

[0100] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 70 °C.

[0101] S4. Winding

[0102] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 70 °C. After drying is completed, wind and collect the wire through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 600 r / min.

[0103] Example 6

[0104] This example provides a method for spreading the yarn of carbon fiber based on ultrasonic waves, which includes the following steps:

[0105] S1. Ultrasonic bath

[0106] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0107] S2. Extrusion of the discharged water

[0108] The water outlet angle of the carbon fiber is 90°.

[0109] S3. Drying

[0110] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 90 °C.

[0111] S4. Winding

[0112] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 90 °C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 600 r / min.

[0113] Example 7

[0114] This example provides an ultrasonic-based carbon fiber yarn spreading method, which includes the following steps:

[0115] S1. Ultrasonic treatment in the ultrasonic bath

[0116] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0117] S2. Extrusion of the discharged water

[0118] The water outlet angle of the carbon fiber is 90°.

[0119] S3. Drying

[0120] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 100 °C.

[0121] S4. Winding

[0122] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 750 r / min.

[0123] Example 8

[0124] This example provides an ultrasonic-based carbon fiber yarn spreading method, which includes the following steps:

[0125] S1. Ultrasonic treatment in the ultrasonic bath

[0126] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0127] S2. Extrusion of the discharged water

[0128] The water outlet angle of the carbon fiber is 90°.

[0129] S3. Drying

[0130] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 100°C.

[0131] S4. Winding

[0132] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100°C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 450 r / min.

[0133] Comparative Example 1

[0134] This comparative example provides a carbon fiber yarn spreading method, which includes the following steps:

[0135] S1. Ultrasonic treatment in an ultrasonic bath

[0136] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 2.

[0137] S2. Extrusion of the discharged water

[0138] The water outlet angle of the carbon fiber is 90°.

[0139] S3. Drying

[0140] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 100°C.

[0141] S4. Winding

[0142] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100°C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the motor of the yarn collecting disc is 600 r / min.

[0143] Comparative Example 2

[0144] This comparative example provides a carbon fiber yarn spreading method, which includes the following steps:

[0145] S1. Ultrasonic treatment in an ultrasonic bath

[0146] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0147] S2. Extrusion of the discharged water

[0148] The water outlet angle of the carbon fiber is 30°.

[0149] S3. Drying

[0150] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 100 °C.

[0151] S4. Winding

[0152] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the yarn collecting disc motor is 600 r / min.

[0153] Comparative Example 3

[0154] This comparative example provides a carbon fiber yarn spreading method, which includes the following steps:

[0155] S1. Ultrasonic treatment in the ultrasonic bath

[0156] Select a carbon fiber tow with a specification of 48k that has been carbonized at high temperature. Pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0157] S2. Extrusion of the discharged water

[0158] The water outlet angle of the carbon fiber is 90°.

[0159] S3. Drying

[0160] Pass the carbon fiber tow after extrusion through a heating roller, and the temperature of the heating roller is 30 °C at room temperature.

[0161] S4. Winding

[0162] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 30 °C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the yarn collecting disc motor is 600 r / min.

[0163] Comparative Example 4

[0164] This comparative example of the present invention provides a carbon fiber yarn spreading method, which includes the following steps:

[0165] S1. Ultrasonic treatment in the ultrasonic bath

[0166] Select a high-temperature carbonized carbon fiber tow with a specification of 48k, pass the carbon fiber tow through a yarn spreading roller, and use an ultrasonic bath above the yarn spreading roller to ultrasonically widen and thin the carbon fiber tow. The number of yarn spreading rollers is 10.

[0167] S2. Extrusion of the discharged water

[0168] The water outlet angle of the carbon fiber is 90°.

[0169] S3. Drying

[0170] Pass the extruded carbon fiber tow through a heating roller, and the temperature of the heating roller is 100 °C.

[0171] S4. Winding

[0172] Pass the carbon fiber tow after yarn spreading through a heating roller for drying, and the temperature of the heating roller is 100 °C. After drying is completed, wind and collect the yarn through a yarn collecting disc, and the rotational speed of the yarn collecting disc motor is 900 / min.

[0173] Test Example 1

[0174] Take the carbon fibers prepared in Examples 1 to 8 and Comparative Examples 1 to 4, and measure their yarn spreading widths. The results are shown in Table 1.

[0175] The width of the carbon fiber is measured by the following method:

[0176] Measure the width after yarn spreading with a 100 mm precision steel ruler.

[0177] Table 1 Interlacing degree of carbon fibers prepared in Examples 1 to 8 and Comparative Examples 1 to 4

[0178] Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Width (mm) 19 28 22 26 20 26 18 28 Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Width (mm) 18 21 15 16

[0179] It can be seen from Examples 1 to 8 that the carbon fibers prepared by the yarn spreading method of carbon fibers based on ultrasound of the present invention have good fiber spreading effects, indicating that the carbon fibers have the property of width expansion.

[0180] It can be seen from the comparison between Example 2 and Comparative Example 1 that the number of winding yarn spreading rollers in Comparative Example 1 is small, which results in a reduction in the contact area and contact length of the prepared carbon fiber in the yarn spreading bath, and the yarn spreading width is lower than that of the carbon fiber prepared in Example 2, and the width expansion property is poor.

[0181] It can be seen from the comparison between Example 4 and Comparative Example 2 that the water outlet angle in Comparative Example 2 is small, which results in a lower yarn spreading width of the prepared carbon fiber than that of the carbon fiber prepared in Example 4, and the width expansion property is poor.

[0182] It can be seen from the comparison between Example 6 and Comparative Example 3 that the temperature of the heating roller in Comparative Example 3 is at room temperature and cannot remove the moisture of the fiber after yarn spreading, which results in the aggregation of the prepared carbon fiber and the worst width expansion property.

[0183] As can be seen from the comparison between Example 8 and Comparative Example 4, the speed of the yarn take-up reel motor in Comparative Example 4 was too high, resulting in an increase in the tensile force at both ends of the carbon fiber, causing the width of the carbon fiber after yarn spreading to become narrower before passing through the heating roller and showing poor spreading performance.

[0184] The above are the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A method for spreading carbon fiber yarn based on ultrasound, characterized in that: The carbonized carbon fiber tow is subjected to ultrasonic vibration, extrusion, and heating roller drying in sequence to obtain carbon fiber.

2. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The temperature of the heating roller is 50-100° C., and the frequency of the ultrasonic pool is 100-120 KHz.

3. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The specific operation of the ultrasonic oscillation is to pass the carbonized carbon fiber bundle through a yarn spreading roller, and use an ultrasonic plate above the yarn spreading roller to ultrasonically spread the carbon fiber bundle to make it wider and thinner.

4. The method for spreading carbon fiber based on ultrasound according to claim 3, characterized in that: The water outlet angle of the carbon fiber in the ultrasonic tank is 40° to 90°, and the number of the yarn spreading rollers is 6 to 16.

5. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The specific operation of the extrusion is to squeeze out excess water from the carbon fiber bundle after the ultra-oscillation treatment through an extrusion roller.

6. The method for spreading carbon fiber yarn based on ultrasound according to claim 5, characterized in that: The surface of the squeeze roller had parallel grooves of 0.5 mm.

7. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The specific operation of the heating roller drying is to dry the extruded carbon fiber tow through the heating roller to keep the carbon fiber tow in a fixed shape.

8. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The tow count of the carbon fiber tow is 48k.

9. The method for spreading carbon fiber yarn based on ultrasound according to claim 1, characterized in that: The following steps are also included: The carbon fiber after the yarn spreading is wound on a yarn collecting disk, and the speed of the yarn collecting disk motor is 100-600r / min.

10. A carbon fiber, characterized in that: The carbon fiber is prepared by the ultrasonic-based carbon fiber yarn spreading method according to any one of claims 1 to 9.

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