Sample preparation device and method for high-performance fiber performance test sample

Abstract

The invention discloses a sample preparation device and method for a high-performance fiber performance test sample, and the sample preparation device for the high-performance fiber performance test sample comprises a feeding unit for releasing a high-performance fiber multifilament bundle yarn; the resin impregnation unit is used for carrying out resin impregnation operation on the high-performance fiber multifilament bundle yarns released by the discharging unit; the curing system is used for carrying out curing operation on the high-performance fiber multifilament bundle yarn subjected to resin impregnation operation in the resin impregnation unit; the patch unit is used for carrying out patch operation on the high-performance fiber multifilament bundle yarns which are cured in the curing system; and the cutting unit is used for cutting the high-performance fiber multifilament bundle yarns subjected to the patch operation in the patch unit. According to the device and the method, the impregnation-curing-patching-curing sample preparation process can be completed at one time, the sample preparation period and unstable factors in the sample preparation process are reduced, the operation is simple, rapid and convenient, and the prepared sample is stable in quality and good in consistency.

Description

Technical Field

[0001] This invention belongs to the field of high-performance fiber performance testing technology, specifically relating to a sample preparation device and method for high-performance fiber performance testing samples. Background Technology

[0002] High-performance fibers generally refer to fibers with a strength greater than 17.6 cN / dtex and an elastic modulus greater than 440 cN / dtex. High-performance fibers are a new generation of special synthetic fibers developed by fiber science and engineering, possessing high strength, high modulus, and high-temperature resistance. They are mainly used in various fields of military and high-tech industries. In particular, they are used as reinforcements in composite materials, serving as the core component that bears the load. Common high-performance fibers include inorganic fibers such as glass fiber, carbon fiber, and basalt fiber.

[0003] Accurate measurement of the mechanical properties of high-performance fibers, such as tensile strength and modulus, is crucial for characterizing the mechanical properties of carbon fibers and is also a key basis for improving production processes and designing carbon fiber composites. Existing evaluation methods for high-performance fibers mainly include single-fiber mechanical testing and multifilament yarn impregnation sample preparation mechanical testing. Single-fiber mechanical testing is simple and convenient, but exhibits significant dispersion. Multifilament yarn impregnation often employs an impregnation-curing-slab-curing sample preparation method, resulting in a long preparation cycle, low automation, and reliance on skilled and meticulous operators. Furthermore, in traditional manual sample preparation and mechanical winding sample preparation, high-performance fibers are spirally wound during the sample preparation process, inevitably leading to some offset or angle. The fibers must be wound onto a frame before impregnation, resulting in irregular cross-sections of the sample strips after forming, ranging from near-circular to flat, with resin particles on the sample surface and unstable resin content. All of these factors make it difficult to ensure the uniformity and stability of the resin impregnation in traditional manual fiber tow impregnation methods, leading to large test fluctuations. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a sample preparation device and method for high-performance fiber performance testing samples. This method can complete the sample preparation process of impregnation-curing-patch-curing in one go, reducing the sample preparation cycle and unstable factors during the sample preparation process. It is also simple, fast, and convenient to operate, and the prepared samples have stable quality and good consistency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, a sample preparation apparatus for testing high-performance fiber performance is provided, comprising: a feeding unit for releasing high-performance fiber multifilament bundles; a resin impregnation unit for impregnating the high-performance fiber multifilament bundles released by the feeding unit with resin; a curing system for curing the high-performance fiber multifilament bundles that have completed the resin impregnation operation in the resin impregnation unit; a patching unit for patching the high-performance fiber multifilament bundles that have completed the curing operation in the curing system; and a segmentation unit for segmenting the high-performance fiber multifilament bundles that have completed the patching operation in the patching unit.

[0006] Furthermore, the feeding unit is equipped with tension control damping for adjusting the tension of high-performance fiber multifilament bundle yarn.

[0007] Furthermore, it also includes a positioning roller for adjusting the angle of the high-performance fiber multifilament bundle as it enters the resin impregnation unit.

[0008] Furthermore, it also includes a resin control drive for adjusting the resin content after the high-performance fiber multifilament bundle leaves the resin impregnation unit.

[0009] Furthermore, the curing system employs a modular fiber curing chamber.

[0010] Furthermore, the patch unit includes: a reinforcing strip; and a pre-adhesion drive for bonding the reinforcing strip to a set position on the cured high-performance fiber multifilament bundle.

[0011] Furthermore, it also includes an infrared temperature control device for curing the reinforcing strip with the high-performance fiber multifilament bundle.

[0012] Furthermore, it also includes a dual-track traction machine for driving high-performance fiber multifilament bundles to move at a set speed and along a set path.

[0013] Furthermore, the segmentation unit includes a sample slitting stage for segmenting high-performance fiber multifilament bundles.

[0014] Secondly, a method for preparing a high-performance fiber performance test sample is provided, based on the sample preparation device for the high-performance fiber performance test sample described in the first aspect. The method includes: a feeding unit releasing a high-performance fiber multifilament bundle; the high-performance fiber multifilament bundle entering a resin impregnation unit for resin impregnation; the resin-impregnated high-performance fiber multifilament bundle entering a curing system for curing; the cured high-performance fiber multifilament bundle entering a patching unit for patching; and the patched high-performance fiber multifilament bundle entering a dividing unit for sample dividing to obtain a high-performance fiber performance test sample.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, through a feeding unit for releasing high-performance fiber multifilament bundles, a resin impregnation unit for resin impregnating the high-performance fiber multifilament bundles released by the feeding unit, a curing system for curing the high-performance fiber multifilament bundles that have completed resin impregnation in the resin impregnation unit, a patching unit for patching the high-performance fiber multifilament bundles that have completed curing in the curing system, and a segmentation unit for segmenting the high-performance fiber multifilament bundles that have completed patching in the patching unit, can complete the sample preparation process of impregnation-curing-patching-curing in one go, reducing the sample preparation cycle and unstable factors in the sample preparation process. Moreover, the operation is simple, fast, and convenient, and the quality of the prepared samples is stable and consistent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the entire structure of a sample preparation device for high-performance fiber performance testing provided in an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structural principle of the intermediate curing system; Figure 3 This is a schematic diagram of the structure of the high-performance fiber performance test sample before entering the splitting unit in an embodiment of the present invention; In the diagram: 1. Fiber fixing spindle; 2. Tension control damping; 3. Positioning roller; 4. Resin impregnation unit; 5. Resin adhesive control drive; 6. Curing system; 61. Unit-type fiber curing chamber; 7. Reinforcing strip belt; 71. Reinforcing strip; 8. Pre-bonding drive; 9. Dual-track traction machine; 10. Infrared temperature control device; 11. Sample cutting table; 12. Reinforcing strip connecting belt. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] Example 1 like Figures 1-3 As shown, a sample preparation apparatus for high-performance fiber performance testing includes: a feeding unit for releasing high-performance fiber multifilament bundles; a resin impregnation unit 4 for impregnating the high-performance fiber multifilament bundles released by the feeding unit with resin; a curing system 6 for curing the high-performance fiber multifilament bundles that have completed the resin impregnation operation in the resin impregnation unit 4; a patching unit for patching the high-performance fiber multifilament bundles that have completed the curing operation in the curing system 6; and a segmentation unit for segmenting the high-performance fiber multifilament bundles that have completed the patching operation in the patching unit.

[0019] The feeding unit includes a fiber fixing spindle 1 and a tension control damper 2 for adjusting the tension of the high-performance fiber multifilament bundle. A positioning roller 3 is installed between the feeding unit and the resin impregnation unit 4 to adjust the angle of the high-performance fiber multifilament bundle as it enters the resin impregnation unit 4. A resin control drive 5 is installed between the resin impregnation unit 4 and the curing system 6 to adjust the resin content after the high-performance fiber multifilament bundle leaves the resin impregnation unit 4. The curing system 6 uses a unit-type fiber curing chamber 61. The patching unit includes a reinforcing strip 7 and a pre-adhesion drive 8 for bonding the reinforcing strip 7 to a set position on the cured high-performance fiber multifilament bundle. An infrared temperature control device 10 is used to cure the reinforcing strip 7 and the high-performance fiber multifilament bundle. A dual-track traction machine 9 drives the high-performance fiber multifilament bundle sequentially through the feeding unit, positioning roller 3, resin impregnation unit 4, resin control drive 5, curing system 6, and patching unit at a set speed. The slitting unit includes a sample slitting table 11 for slitting the high-performance fiber multifilament bundle.

[0020] The sample preparation device for high-performance fiber performance testing of the present invention has the following operating steps.

[0021] (1) Before preparing the sample, select a unit fiber curing chamber 61 of appropriate shape according to the sample to be prepared, prepare the required resin, and ensure the stable operation of the resin impregnation unit 4. Maintain a constant temperature and humidity in the sample preparation room, with a room temperature of 20℃±2℃ and a relative humidity of 45%±3%.

[0022] (2) The curing system 6 and the infrared temperature control device 10 gradually heat up to the process curing temperature, and the double tracked traction machine 9 is turned on.

[0023] (3) Set the tension control damping 2 conditions according to the type and specifications of the high-performance fiber. Draw the unimpregnated fiber from the beginning to the end according to the process.

[0024] (4) After the fiber is impregnated with resin, the resin content is adjusted by adjusting the resin control drive 5, and the sample curing speed is adjusted by adjusting the running speed, so that the surface of the prepared sample is uniformly impregnated and free from surface defects such as bubbles.

[0025] (5) The reinforcing strip 7 is initially bonded by the pre-bonding drive 8, and then cured by the double track traction machine 9 and the infrared temperature control device 10.

[0026] (6) Cut the cured carbon fiber sample strip along the middle of the two sets of reinforcing sheets 71. After completing a set of qualified sample strips, change the wire.

[0027] (7) Connect the second sample to the first sample using a yarn air splicer. At the same time, stop impregnating the fibers.

[0028] (8) After the fiber joint leaves the unit fiber curing chamber 61, prepare the second set of fiber samples again according to (4)-(7).

[0029] This invention integrates the four separate steps of impregnation, curing, patching, and curing of multifilament yarn into an automated system. The tension, impregnation degree, and fiber alignment are more stable throughout the process compared to traditional manual sample preparation. Sample preparation time is significantly reduced; traditional manual sample preparation takes more than six hours, while this invention can prepare a set of sample strips in less than ten minutes, meeting the requirements for rapid production feedback. This invention can also adjust the specifications of the unit-type fiber curing chamber to meet the different differences between testing single and multi-bundle fibers, thus achieving the purpose of evaluating the conversion rate of carbon fiber composite materials.

[0030] Example 2 Based on the sample preparation device for high-performance fiber performance testing described in Example 1, this example provides a method for preparing high-performance fiber performance testing samples, including: The feeding unit releases high-performance fiber multifilament bundles; High-performance fiber multifilament bundles enter resin impregnation unit 4 for resin impregnation. The high-performance fiber multifilament bundles that have been impregnated with resin enter the curing system 6 for curing. The high-performance fiber multifilament bundles that have completed the curing process enter the patch unit for patching. The high-performance fiber multifilament bundles that have completed the patching operation are fed into the splitting unit for sample splitting to obtain high-performance fiber performance test samples.

[0031] Example 3 Based on the sample preparation device for high-performance fiber performance testing described in Example 1 and the sample preparation method for high-performance fiber performance testing described in Example 2, this embodiment provides a specific sample preparation method for high-performance fiber performance testing.

[0032] (1) Select a circular unit-type fiber curing chamber 61 with a diameter of 1 mm. Prepare the required epoxy resin (E-44) as the main agent, triethylenetetramine as the curing agent, and acetone as the solvent. Ensure the stable operation of the resin impregnation unit 4. Maintain a constant temperature and humidity in the test room, with a room temperature of 20℃±2℃ and a relative humidity of 45%±3%.

[0033] (2) The curing system 6 is set to a temperature of 150℃, and the infrared temperature control device 10 is set to a temperature of 130℃. The temperature is gradually increased to the process curing temperature, and the dual-track traction machine 9 is turned on.

[0034] (3) Select one spindle of T700 grade 12K carbon fiber and set the tension control damping 2 condition to 500 cm. Draw the unimpregnated fiber from the beginning to the end according to the process.

[0035] (4) After the fiber is impregnated with resin, the resin content is adjusted to about 65% by adjusting the resin control drive 5, and the running speed is adjusted to 0.3m / min.

[0036] (5) The reinforcing strip 7 is initially bonded by the pre-bonding drive 8, and the reinforcing strip is cured by the double track traction machine 9 and the infrared temperature control device 10.

[0037] (6) After confirming that there are no obvious defects such as fuzz on the surface of the carbon fiber strip, cut and divide it along the middle of the two sets of reinforcing sheets 71. Figure 3 In this sample, the length of each reinforcing strip 71 is a=50mm, the sample length between two reinforcing strips 71 is b=150mm, the sample diameter is d=10mm, and the total diameter of the sample and the reinforcing strip connecting strip 12 is c=20mm. After completing a set of 10 qualified samples, the wire is changed.

[0038] (7) Connect the second set of samples to the first set of samples using a yarn air splicer. At the same time, stop impregnating the fibers. (Taking a single bundle of fibers as an example, the actual number of samples can be based on the specific number of samples, and the unit-type fiber curing chambers can be stacked together to prepare samples).

[0039] (8) After the fiber joint leaves the unit fiber curing chamber 61, repeat the preparation of the second set of fiber strips according to (4)-(7). The preparation time for each set of reinforcing fiber strips is about ten minutes.

[0040] (9) The strength of T700 grade 12K carbon fiber was tested to be 5058MPa and the modulus was 237GPa.

[0041] Example 4 (1) Select a rectangular unit-type fiber curing chamber 61 with a diameter of 2mm×3mm. Prepare the required epoxy resin (E-44) as the main agent, triethylenetetramine as the curing agent, and acetone as the solvent. Ensure the stable operation of the resin impregnation unit 4. Maintain a constant temperature and humidity in the test room, with a room temperature of 20℃±2℃ and a relative humidity of 45%±3%.

[0042] (2) The curing system 6 is set to a temperature of 160℃, and the infrared temperature control device 10 is set to a temperature of 130℃. The temperature is gradually increased to the process curing temperature, and the dual-track traction machine 9 is turned on.

[0043] (3) Select 8 spindles of T700 grade 12K carbon fiber and set the tension control damping 2 condition to 500 cm. Draw the unimpregnated fiber from the beginning to the end according to the process.

[0044] (4) After the fiber is impregnated with resin, the resin content is adjusted to about 65% by adjusting the resin control drive 5, and the running speed is adjusted to 0.2m / min.

[0045] (5) The reinforcing strip 7 is initially bonded by the pre-bonding drive 8, and the reinforcing strip is cured by the double track traction machine 9 and the infrared temperature control device 10.

[0046] (6) After confirming that there are no obvious defects such as fuzz on the surface of the carbon fiber strip, cut and divide it along the middle of the two sets of reinforcing sheets 71. After completing one set of 10 qualified strips, replace the wire.

[0047] (7) Connect the four samples of the second group to the samples of the first group using a yarn air splicer. At the same time, stop impregnating the fibers.

[0048] (8) After the fiber joint leaves the unit fiber curing chamber 61, repeat the preparation of the second set of fiber strips according to (4)-(7). The preparation time for each set of reinforcing fiber strips is about ten minutes.

[0049] (9) A small sample of T700 grade 12K carbon fiber bundle (8 bundles) was tested. The strength was 4700MPa and the modulus was 238GPa. It can be assessed that with a slight increase in the number of carbon fibers, the strength utilization rate of the carbon fiber bundle decreased, while the modulus utilization of the carbon fiber remained stable.

[0050] Example 5 (1) Select a circular unit-type fiber curing chamber 61 with a diameter of 2mm. Prepare the required epoxy resin (E-44) as the main agent, triethylenetetramine as the curing agent, and acetone as the solvent. Ensure the stable operation of the resin impregnation unit 4. Maintain a constant temperature and humidity in the test room, with a room temperature of 20℃±2℃ and a relative humidity of 45%±3%.

[0051] (2) The curing system 6 is set to a temperature of 160℃, and the infrared temperature control device 10 is set to a temperature of 130℃. The temperature is gradually increased to the process curing temperature, and the dual-track traction machine 9 is turned on.

[0052] (3) Select a spindle of untwisted roving glass fiber (4800TEX) and use the fiber inward retraction method. Draw the unimpregnated fiber from the beginning to the end according to the process.

[0053] (4) After the fiber is impregnated with resin, the resin content is adjusted to about 65% by adjusting the resin control drive 5, and the running speed is adjusted to 0.2m / min.

[0054] (5) The reinforcing strip 7 is initially bonded by the pre-bonding drive 8, and the reinforcing strip is cured by the double track traction machine 9 and the infrared temperature control device 10.

[0055] (6) After confirming that there are no obvious defects such as fuzz on the surface of the carbon fiber strip, cut and divide it along the middle of the two sets of reinforcing sheets 71. After completing one set of 10 qualified strips, replace the wire.

[0056] (7) Connect the second group of samples to the first group of samples using a yarn air splicer. At the same time, stop impregnating the fibers.

[0057] (8) After the fiber joint leaves the unit fiber curing chamber 61, repeat the preparation of the second set of fiber strips according to (4)-(7). The preparation time for each set of reinforcing fiber strips is about ten minutes.

[0058] (9) Test the untwisted roving glass fiber (4800TEX) strips. The strength is 1400MPa and the modulus is 71GPa.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sample preparation device for high-performance fiber performance testing samples, characterized in that, include: A feeding unit for releasing high-performance fiber multifilament bundles; A resin impregnation unit (4) for impregnating high-performance fiber multifilament bundles released from the feeding unit with resin. A curing system (6) for curing high-performance fiber multifilament bundles that have undergone resin impregnation in the resin impregnation unit (4). A patching unit for patching high-performance fiber multifilament bundles that have undergone curing in the curing system (6); A splitting unit for splitting high-performance fiber multifilament bundles that have undergone patching operations in a patching unit.

2. The sample preparation device for high-performance fiber performance testing according to claim 1, characterized in that, The feeding unit is equipped with a tension control damper (2) for adjusting the tension of high-performance fiber multifilament bundle yarn.

3. The sample preparation device for high-performance fiber performance testing according to claim 1, characterized in that, It also includes a positioning roller (3) for adjusting the angle when the high-performance fiber multifilament bundle enters the resin impregnation unit (4).

4. The sample preparation device for high-performance fiber performance testing samples according to claim 1, characterized in that, It also includes a resin control drive (5) for adjusting the resin content after the high-performance fiber multifilament bundle leaves the resin impregnation unit (4).

5. The sample preparation device for high-performance fiber performance testing samples according to claim 1, characterized in that, The curing system (6) adopts a unit-type fiber curing chamber (61).

6. The sample preparation apparatus for high-performance fiber performance testing samples according to claim 1, characterized in that, The surface mount unit includes: Reinforced strip (7); Pre-bonding drive (8) is used to bond the reinforcing strip (7) to the set position of the cured high-performance fiber multifilament bundle.

7. The sample preparation apparatus for high-performance fiber performance testing samples according to claim 6, characterized in that, It also includes an infrared temperature control device (10) for curing the reinforcing strip (7) with the high-performance fiber multifilament bundle yarn.

8. The sample preparation apparatus for high-performance fiber performance testing samples according to claim 1, characterized in that, It also includes a dual-track traction machine (9) for driving high-performance fiber multifilament bundles to move at a set speed and path.

9. The sample preparation device for high-performance fiber performance testing samples according to claim 1, characterized in that, The segmentation unit includes a sample cutting platform (11) for segmenting high-performance fiber multifilament bundles.

10. A method for preparing a high-performance fiber performance test sample, characterized in that, Based on the sample preparation apparatus for high-performance fiber performance test samples according to any one of claims 1 to 9, the method includes: The feeding unit releases high-performance fiber multifilament bundles; High-performance fiber multifilament bundles are introduced into the resin impregnation unit (4) for resin impregnation. The high-performance fiber multifilament bundles that have been impregnated with resin are then fed into the curing system (6) for curing. The high-performance fiber multifilament bundles that have completed the curing process enter the patch unit for patching. The high-performance fiber multifilament bundles that have completed the patching operation are fed into the splitting unit for sample splitting to obtain high-performance fiber performance test samples.

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