TWI703034B - Wear-resistant layer structure of braking track and reinforced prepreg thereof - Google Patents

Abstract

The present disclosure provides a reinforced prepreg which is applied to form a wear-resistant layer structure of a braking track and includes a fiber fabric and a mixture. The mixture is mixed with the fiber fabric and includes a resin and a plurality of needle-shaped crystals with micro- or nano-scale. The needle-shaped crystals are mixed with the resin. Therefore, the wear resistance of the wear-resistant layer structure of the braking track formed by the reinforced prepreg is increased.

Description

Brake edge wear-resistant layer structure and its reinforced prepreg material

The invention relates to a brake rim wear-resistant layer structure and its reinforced prepreg material, and more particularly to a brake rim wear-resistant layer structure and its reinforced pre-impregnated material applied to composite rims (ie rims made of composite materials) Dip material.

Bicycle braking methods can be divided into two types: disc brakes and caliper brakes. The difference between the two is the mechanism that generates braking force. The mechanism of the disc brake is to make the disc clamp the disc by the brake, and then slow down and stop the moving bicycle; the mechanism of the caliper brake is to clamp the brake edge of the rim with rubber brake pads. The friction between the brake block and the rim slows down the speed. For carbon fiber products for bicycles that are constantly pursuing extreme light weight, the mechanical structure included in the disc brake mechanism is relatively complex and the weight advantage must be sacrificed. In contrast, the caliper brake does not require such a complicated structure. And it has absolute advantages in weight and cost.

The mechanism of the caliper brake is as described above. The brake pads of rubber material directly clamp the brake edge of the rim surface, and then generate friction force to slow down and stop the bicycle rim in the traveling state. However, in the process of contact and wear between the brake shoes and the rim, both of them produce great wear. Over time, they will cause irreversible damage to the structure of the carbon fiber rim, such as carbon fiber exposure and gouge marks on the appearance of the carbon fiber rim, or Defects such as the damage to the strength of the carbon fiber rim body, which in turn causes consumers to have safety concerns when using brakes.

In addition, when riding under more severe weather conditions such as rainy weather, the sand entrained in the muddy water is likely to be caught between the brake block and the rim. In this situation, using the brake is equivalent to using sharp sand to cut the carbon fiber rim. The surface of the rim, often after riding in the rain, can be observed to be covered with deep grooves on the brake side of the rim.

At present, the common reinforcement method is to add a certain thickness (approximately 0.1 mm to 0.3 mm) of carbon fiber, glass fiber or basalt fiber prepreg surface layer to the position of the brake side in the area that is susceptible to wear, although this surface layer and carbon fiber rim It is integrally formed, but these fiber materials are not inherently more wear-resistant than the carbon fiber of the rim body. Therefore, it is necessary to increase the thickness of the prepreg to delay the occurrence of obvious damage to the brake side, but this method is not a good solution the way. On the other hand, although the carbon fiber cloth on the main surface of the rim can provide basic protection of the main structure, it also adds a lot of weight, and the improvement of the damage to the appearance of the rim by these structural layers is extremely limited, even if it is worn The resulting problems such as yarn shedding, wear marks, and gouge marks will not immediately cause damage to the strength of the rim, but it may still bring bad feelings to consumers, and even lead to customer complaints or make consumers unwilling to buy such The result of products with safety concerns.

In view of this, how to effectively improve the wear resistance of the brake rim of carbon fiber rims while maintaining the demand for lightweight has become the goal of the relevant industry.

The invention provides a brake rim wear-resistant layer structure and its reinforcing prepreg material. Through the addition of needle-shaped crystals, the abrasion resistance of the brake rim wear-resistant layer structure can be improved.

According to an embodiment of the present invention, a reinforced prepreg material is provided for a brake edge wear-resistant layer structure and includes a fiber fabric and a mixture. The mixture is mixed with the fiber fabric and includes a resin and a plurality of needles. Crystals, needle-like crystals are mixed with resin, and each needle-like crystal is micron or nanometer size.

In this way, the needle-like crystals can improve the problem of poor abrasion resistance of the resin itself, and can also increase the bonding effect of the resin and the fiber fabric, and can avoid the exposed damage of the fiber fabric and improve the abrasion resistance.

According to the plural embodiments of the aforementioned reinforced prepreg material, the ratio of needle-like crystals to the mixture can be 5-50 phr; preferably, the ratio of needle-like crystals to the mixture is 10-25 phr. Or the material of each needle-shaped crystal may be an inorganic non-metallic material. Or the material of each needle crystal can be zinc oxide, magnesium oxide or zinc sulfide. Or each needle-shaped crystal may have a needle diameter and a needle length, the needle diameter is between 0.5 μm and 10 μm, and the needle length is between 10 μm and 100 μm. Alternatively, each needle-shaped crystal may have a single needle, double needle, three needle, or four needle cone structure.

According to the foregoing plural embodiments of the reinforced prepreg material, the weight percentage of the mixture in the reinforced prepreg material can be 30% to 60%; preferably, the weight percentage of the mixture in the reinforced prepreg material can be 35% to 45%. Or the material of the fiber fabric can be liquid crystal polymer fiber.

Another embodiment according to one aspect of the present invention provides a brake rim wear-resistant layer structure, which is used on the surface of a composite rim, and includes a fiber fabric and a mixture, the mixture is mixed with the fiber fabric and includes a resin and Multiple needle-like crystals, needle-like crystals are mixed with resin, and each needle-like crystal is micron or nanometer size.

According to the foregoing plural embodiments of the brake rim wear-resistant layer structure, the material of each needle-shaped crystal can be zinc oxide, magnesium oxide or zinc sulfide. Or each needle-shaped crystal may have a needle diameter and a needle length, the needle diameter is between 0.5 μm and 10 μm, and the needle length is between 10 μm and 100 μm. Alternatively, each needle-shaped crystal may have a single needle, double needle, three needle, or four needle cone structure. Or the material of the fiber fabric can be liquid crystal polymer fiber. The thickness of the brake rim wear layer structure is between 0.1 mm and 0.5 mm. Or the radial outer part of the composite rim may have a first radial width, the brake rim wear-resistant layer structure has a second radial width on the surface of the composite rim, and the second radial width is less than or equal to the first radial width.

100‧‧‧Reinforced prepreg material

110‧‧‧Fiber fabric

120‧‧‧Mixture

121‧‧‧Resin

122‧‧‧Needle crystal

200‧‧‧Brake edge wear-resistant layer structure

200a‧‧‧Brake edge wear-resistant layer structure

200b‧‧‧Brake edge wear-resistant layer structure

200c‧‧‧Brake edge wear-resistant layer structure

210‧‧‧Fiber fabric

220‧‧‧mixture

221‧‧‧Resin

222‧‧‧Needle crystal

300, 300a‧‧‧Main body

300b, 300c‧‧‧Main body

310a, 310b, 310c‧‧‧Rim flange

400, 400a‧‧‧Composite wheel

400b, 400c‧‧‧Composite wheel

D1‧‧‧Needle diameter

L1‧‧‧Needle length

W1‧‧‧First radial width

W2‧‧‧Second radial width

Y1‧‧‧Height

B1‧‧‧Brake block

R1‧‧‧Virtual Centerline

Figure 1 shows a schematic cross-sectional view of a reinforced prepreg material according to an embodiment of the present invention; Figure 2 shows a three-dimensional schematic diagram of the needle-shaped crystal of Figure 1; Figure 3 shows another embodiment according to the present invention A schematic partial cross-sectional view of a brake-side wear-resistant layer structure applied to a composite rim; Figure 4A illustrates a partial cross-sectional schematic view of a brake-side wear-resistant layer structure applied to a composite rim according to another embodiment of the present invention; Figure 4B shows a schematic partial cross-sectional view of a brake rim wear layer structure applied to a composite rim according to another embodiment of the present invention; Figure 4C shows a brake rim wear resistance according to another embodiment of the present invention A partial cross-sectional schematic diagram of the layer structure applied to a composite rim; Figure 5A shows the general wear resistance test result of the first comparative example of the brake edge wear layer structure; Figure 5B shows the brake edge wear of the present invention Fig. 5C shows the general abrasion resistance test results of the second experimental example of the brake rim wear layer structure of the present invention; Fig. 6 shows the brake rim resistance (A) The second comparative example of the abrasive layer structure, (B) the first comparative example, (C) the second experimental example of the brake edge wear-resistant layer structure of the present invention and (D) the sand wear resistance of the third comparative example Test result diagram; Figure 7A shows the sand abrasion resistance test result of the second comparative example of the brake edge wear layer structure; Figure 7B shows the sand abrasion resistance of the first comparative example of the brake edge wear layer structure Test result diagram; Figure 7C shows the sand abrasion test result of the second experimental example of the brake rim wear layer structure of the present invention; Figure 7D shows the mud of the third comparative example of the brake rim wear layer structure Figure 8A shows an enlarged view of the sand abrasion test result of the second comparative example of the brake rim wear layer structure; Figure 8B shows the first comparative example of the brake rim wear layer structure An enlarged view of the results of the sand abrasion test; Figure 8C shows an enlarged view of the results of the sand abrasion test of the second experimental example of the brake side wear layer structure of the present invention; Figure 8D shows the brake side wear resistance An enlarged view of the sand abrasion test result of the third comparative example of the layer structure; Fig. 9A shows the general abrasion test result of the fourth comparative example of the composite rim; and Fig. 9B shows the application of the brake edge of the present invention The general abrasion test results of the third experimental example of a composite rim with a wear layer structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. For the sake of clarity, many practical details will be explained in the following description. However, the reader should understand that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be drawn in a simple schematic manner in the drawings, and repeated elements may be represented by the same or similar numbers.

In addition, when a component (or mechanism or module, etc.) is “connected”, “configured” or “coupled” to another component in this document, it can mean that the component is directly connected, directly disposed, or directly coupled to another component It can also mean that an element is indirectly connected, indirectly disposed, or indirectly coupled to another element, that is, there are other elements between the element and another element. When it is clearly stated that a certain element is "directly connected", "directly arranged" or "directly coupled" to another element, it means that there is no other element between the element and another element. The terms first, second, third, etc. are only used to describe different elements or components, and there are no restrictions on the elements/components themselves. Therefore, the first element/component can also be referred to as the second element/component. And the combination of components/components/mechanisms/modules in this article is not a combination of general well-known, conventional or conventional in this field. It cannot be judged whether the combination relationship is based on whether the component/component/mechanism/module itself is conventional It can be easily completed by ordinary knowledgeable persons in the technical field.

Please refer to FIGS. 1 and 2. FIG. 1 is a schematic cross-sectional view of a reinforced prepreg material 100 according to an embodiment of the present invention, and FIG. 2 is a three-dimensional schematic view of the needle-shaped crystal 122 of FIG. . The reinforced prepreg material 100 is used for a brake rim wear-resistant layer structure and includes a fiber fabric 110 and a mixture 120. The mixture 120 is mixed with the fiber fabric 110 and includes a resin 121 and a plurality of needle-shaped crystals 122, and the needle-shaped crystals 122 and resin 121 is mixed, and each needle-shaped crystal 122 is of micrometer or nanometer size.

In this way, the needle-shaped crystal 122 can improve the problem of poor wear resistance of the resin 121 itself, and can increase the bonding effect of the resin 121 and the fiber fabric 110, prevent the fiber fabric 110 from being exposed and damaged, and improve the wear resistance. The details of the reinforcing prepreg material 100 will be detailed later.

The material of the fiber fabric 110 may be liquid crystal polymer fiber (LCP fiber), that is, the fiber fabric 110 is woven from liquid crystal polymer fiber, and has high wear resistance and scratch resistance. In other embodiments, the fiber fabric 110 can also be made of materials such as carbon fiber, glass fiber, and basalt fiber.

The resin 121 in the mixture 120 preferably uses the same resin material as the composite rim to be combined. For example, when the composite rim to be combined is a carbon fiber and epoxy resin rim, the resin 121 is epoxy resin. . The material of each needle-shaped crystal 122 may be an inorganic nonmetal crystal, such as zinc oxide (ZnO), magnesium oxide (MgO) or zinc sulfide (ZnS), or the material of each needle-shaped crystal 122 may be an organic material (organic), metal material or ceramic material, such as aluminum oxide (Al ₂ O ₃ ), silicon carbide (SiC) or silicon nitride (SiN). In this embodiment, the needle-shaped crystals 122 are zinc oxide and have a tetrapod-shaped structure. Each needle-shaped crystal 122 may have a needle diameter D1 and a needle length L1, and the needle diameter D1 is between Between 0.5 microns and 10 microns, the needle length L1 is between 10 microns and 100 microns. In other embodiments, the needle-shaped crystal 122 may have a single-needle, double-needle, three-needle, or multi-needle structure, and is not limited to the foregoing disclosure.

In addition to the problem of poor abrasion resistance of the reinforced resin 121, the needle-shaped crystal 122 has a mutual riveting effect (meaning that the needle-shaped structure can strengthen the combination of the resin 121 and the fiber fabric 110). It is used to improve the problem of poor bonding between the resin 121 and the fiber fabric 110, thereby significantly improving the wear resistance.

In addition, the weight percentage of the mixture 120 in the reinforced prepreg material 100 may be 30% to 60%; preferably, the weight percentage of the mixture 120 in the reinforced prepreg material 100 may be 35% to 45%. The ratio of the needle-shaped crystal 122 to the mixture 120 can be 5-50 phr, where phr represents the amount of the needle-shaped crystal 122 to be added per hundred parts of the resin 121. Preferably, the ratio of the needle-shaped crystal 122 to the mixture 120 may be 10-25 phr.

In other words, in one embodiment, a plurality of needle-shaped crystals 122 can be added to the resin 121 first, and mixed uniformly to form the mixture 120, and the ratio of the needle-shaped crystals 122 to the mixture 120 is 15 phr; then, the mixture 120 It is impregnated with the fiber fabric 110 to form the reinforced prepreg material 100, and the weight percentage of the mixture 120 in the reinforced prepreg material 100 is 45%, and the weight percentage of the fiber fabric 110 in the reinforced prepreg material 100 is 55%. Not limited to this.

Please refer to FIG. 3, which illustrates a partial cross-sectional schematic diagram of a brake rim wear layer structure 200 applied to a composite rim 400 according to another embodiment of the present invention. The composite rim 400 includes a main body 300 which can be made of carbon fiber and epoxy resin. The brake rim wear layer structure 200 is disposed on the main body 300 and includes a fiber fabric 210 and a mixture 220, the mixture 220 and the fiber fabric 210 It is mixed and includes a resin 221 and a plurality of needle-shaped crystals 222. The needle-shaped crystals 222 are mixed with the resin 221, and each needle-shaped crystal 222 has a micrometer or nanometer size.

In the manufacturing process, the reinforced prepreg material 100 can be used to make the brake edge wear-resistant layer structure 200. More specifically, the reinforcing prepreg material 100 can be attached to the carbon fiber prepreg cloth to be made into the main body 300, and the two are cured by heat and pressure to form the main body 300 of the composite rim 400. Therefore, the formed brake rim wear layer structure 200 is located on the surface of the main body 300, and the thickness of the brake rim wear layer structure 200 can be between 0.1 mm and 0.5 mm. The brake edge wear-resistant layer structure 200 produced by this process does not require additional plating or laser post-processing procedures for the brake edge, so it has the advantage of simple manufacturing process. More preferably, the thickness of the brake rim wear-resistant layer structure 200 can be between 0.1 mm and 0.2 mm, which has advantages in thickness and weight.

In addition, please refer to FIG. 4A, FIG. 4B, and FIG. 4C. FIG. 4A illustrates a partial cross-sectional view of a brake edge wear layer structure 200a applied to a composite rim 400a according to another embodiment of the present invention. Fig. 4B shows a partial cross-sectional view of a brake rim wear layer structure 200b applied to a composite rim 400b according to another embodiment of the present invention, and Fig. 4C shows a brake rim structure according to still another embodiment of the present invention. A schematic partial cross-sectional view of the grinding layer structure 200c applied to a composite rim 400c.

As shown in Figure 4A, the radially outer portion of the composite rim 400a may have a first radial width W1, the brake rim wear layer structure 200a has a second radial width W2 on the surface of the composite rim 400a, and the second radial The width W2 is less than or equal to the first radial width W1. In detail, the brake side wear-resistant layer structure 200a is located on the surface of the main body 300a. The composite rim 400a has a left-right symmetrical structure with respect to a virtual center line R1. The outer surfaces of the left and right rims are located in a radial direction, and the brake side is resistant to The second radial width W2 of the grinding layer structure 200a in the radial direction is less than or equal to the first radial width W1 of the composite rim 400a in the radial direction. In other words, the brake rim wear-resistant layer structure 200a covers the surface of the left and right sides of the part of the main body 300 and is adjacent to the rim flange 310a, and when the composite rim 400a is assembled on a bicycle (not shown) and is fitted with two brake blocks B1 , The two side brake edge wear-resistant layer structure 200a will respectively correspond to the two brake blocks B1, and can provide the brake block B1 to rub, so as to achieve the purpose of braking. More preferably, the height Y1 from the center line of the brake rim wear layer structure 200a to the rim flange 310a is equal to the height Y1 from the center line of the brake block B1 to the rim flange 310a.

As shown in Figure 4B, the brake rim wear layer structure 200b is located on the surface of the main body 300b and covers the rim flange 310b. Preferably, the second radial width W2 of the brake rim wear-resistant layer structure 200b in the radial direction is less than or equal to the first radial width W1 of the composite rim 400b in the radial direction. As shown in FIG. 4C, the brake rim wear-resistant layer structure 200c is located on the main body 300c of the composite rim 400c and covers all surfaces except the rim flange 310c. It can be seen that the brake rim wear-resistant layer structure of the present invention can be configured at different positions on the composite rim according to different requirements, and has the advantage of flexible configuration.

Please refer to Figure 5A, Figure 5B and Figure 5C. Figure 5A shows the general wear resistance test results of the first comparative example of the brake edge wear layer structure, and Figure 5B shows the brake edge resistance of the present invention. The general abrasion resistance test result diagram of the first experimental example of the abrasive layer structure, and Figure 5C shows the general abrasion resistance test result diagram of the second experimental example of the brake edge wear layer structure of the present invention.

The brake edge wear-resistant layer structure of the first comparative example is composed of fiber fabric and resin, wherein the material of the fiber fabric is glass fiber, and the material of the resin is epoxy resin. The brake edge wear-resistant layer structure of the first experimental example of the present invention is composed of fiber fabric and a mixture. The fiber fabric is made of glass fiber, and the resin is made of epoxy resin. The needle-shaped crystals are zinc oxide and are contained in the mixture. The ratio is 20phr. The brake edge wear-resistant layer structure of the second experimental example of the present invention is composed of fiber fabric and a mixture. The material of the fiber fabric is liquid crystal polymer fiber, the material of the resin is epoxy resin, and the needle-shaped crystal is zinc oxide and the mixture is The ratio in is 20phr. The test parameters of the general wear resistance test are: a general brake shoe as a friction object, a load of 10 kg, a friction frequency of 6 Hz, and a friction stroke (stroke) of 85 mm. After 2,900 friction cycles, the brake edge wear layer structure of the first comparative example has obvious fiber damage as shown in Figure 5A. In addition, after more than 25,000 friction cycles, the first experimental example and the first 2 The brake edge wear-resistant layer structure of the experimental example showed obvious fiber abrasion as shown in Figure 5B and Figure 5C. It can be seen that since the brake rim wear layer structure of the present invention is a mixture of needle-shaped crystals and resin, the first comparative example without any needle-shaped crystals in the abrasion test has improved abrasion resistance by about 8 times or more. degree.

Please refer to Fig. 6, Fig. 7A, Fig. 7B, Fig. 7C, Fig. 7D, Fig. 8A, Fig. 8B, Fig. 8C and Fig. 8D. Fig. 6 shows the structure of the brake rim wear layer (A) the second comparative example, (B) the first comparative example, (C) the second experimental example of the brake edge wear layer structure of the present invention, and (D) the wetland sediment in the third comparative example (such as rain Road conditions) Abrasion resistance test results, Figure 7A shows the wetland sand abrasion resistance test results of the second comparative example of the brake side wear layer structure, and Figure 7B shows the first comparison of the brake side wear layer structure Example of the wetland sand abrasion test results, Figure 7C shows the second test example of the brake edge wear layer structure, and Figure 7D shows the brake edge wear layer structure The results of the wetland sand abrasion test of the third comparative example. Figure 8A shows the enlarged view of the wetland sand abrasion test results of the second comparative example of the brake edge wear layer structure. Figure 8B shows the brake An enlarged view of the wetland sand abrasion test results of the first comparative example of the side wear layer structure. Figure 8C shows the wetland sand wear test of the second experimental example of the brake side wear layer structure of the present invention An enlarged view of the results, Figure 8D shows an enlarged view of the wetland sand abrasion test results of the third comparative example of the brake edge wear layer structure.

The brake rim wear layer structure of the second comparative example is composed of unidirectional fibers and resin, wherein the unidirectional fiber material is carbon fiber, and the resin material is epoxy resin. The brake rim wear layer structure of the third comparative example is composed of fiber fabric and resin, wherein the material of the fiber fabric is carbon fiber, and the material of the resin is epoxy resin. In Figure 6, (A) is the wetland sand abrasion test result of the second comparative example, (B) is the wetland sand abrasion test result of the first comparative example, (C) is the second comparative example The wetland sand abrasion test result of the experimental example, (D) is the wetland sand abrasion test result of the third comparative example. The test parameters of the wetland sand abrasion test are: general brake pads are used as the friction material, the load is 10 kg, the friction frequency is 3 Hz, and the sand and water are mixed for the test. The size of the sand is 120 microns, and the test is 10,000 cycles .

From the test results of Fig. 6, Fig. 7A, Fig. 7B, Fig. 7C, Fig. 7D, Fig. 8A, Fig. 8B, Fig. 8C and Fig. 8D, it can be seen that the first comparative example, the second comparative example and The brake edge wear layer structure of the third comparative example all showed severe scratches. Only the brake edge wear layer structure of the second embodiment of the present invention did not show obvious scratches, so it can be proved that the brake edge wear layer structure of the present invention Has good scratch resistance.

Please refer to Figures 9A and 9B. The fourth comparative example shown in Figure 9A is a general wear resistance test result diagram of a composite rim, and Figure 9B shows the third application of the brake edge wear layer structure of the present invention. General abrasion test results of the composite rim of the experimental example. The composite rim of the fourth comparative example is a general carbon fiber composite rim without any brake rim wear layer structure, and the third experimental example of the brake rim wear layer structure of the present invention has the surface of the composite rim of the present invention Brake edge wear-resistant layer structure. The brake edge wear-resistant layer structure is composed of fiber fabric and mixture. The material of the fiber fabric is liquid crystal polymer fiber, the resin material is epoxy resin, and the needle-like crystals are zinc oxide and are in the mixture. The ratio is 20phr. The test conditions are: braking with a gripping force of 180 Newtons for 7.5 seconds at a speed of 25 kilometers per hour, with an interval of 60 seconds between each braking cycle.

After 1 cycle of testing, the composite rim of Comparative Example 4 has been damaged in a small area. After 2 cycles of testing, as shown in Figure 9A, the composite rim of Comparative Example 4 has a large area of damage. damage. On the other hand, as shown in Figure 9B, the composite rim of the third experimental example using the brake edge wear layer structure of the present invention has no damage after up to 10 cycles of testing, which proves that the brake edge of the present invention is wear resistant. The layer structure has good scratch resistance.

From the above-mentioned embodiments and many experimental examples, it can be known that the brake edge wear-resistant layer structure and the reinforcing prepreg material of the present invention do have better wear resistance. Compared with the conventional bonding interface between fiber fabric and resin, the strength is not good. When the brake edge of the composite rim is rubbed by the brake pads, even if the fiber fabric itself is not easily damaged, it may cause both fiber fabric and resin. The condition of peeling and disintegration from the interface will eventually lead to fiber exposure or structural damage; the present invention forms a mixture of needle-like crystals and resin, and the needle-like structure of the needle-like crystals produces a mutual riveting effect between the two , Can greatly improve the problem of poor bonding between resin and fiber fabric interface.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone who is familiar with this technique can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be the one defined by the scope of patent application attached hereafter.

100‧‧‧Reinforced prepreg material

110‧‧‧Fiber fabric

120‧‧‧Mixture

121‧‧‧Resin

122‧‧‧Needle crystal

Claims (13)

A reinforced prepreg material used in a brake edge wear-resistant layer structure. The reinforced prepreg material includes: a fiber fabric, the material of which is liquid crystal polymer fiber; and a mixture, mixed with the fiber fabric and including: a resin And a plurality of multi-needle crystals, mixed with the resin, and each of the multi-needle crystals is micron or nanometer size, wherein the ratio of the multi-needle crystals to the mixture is 10-25phr. In the reinforced prepreg material described in item 1 of the scope of patent application, the material of each of the multi-needle crystals is an inorganic non-metallic material. As for the reinforced prepreg material described in item 2 of the scope of patent application, the material of each of the multi-needle crystals is zinc oxide, magnesium oxide or zinc sulfide. The reinforced prepreg material as described in item 1 of the scope of patent application, wherein each of the multi-needle crystals has a needle diameter and a needle length, the needle diameter is between 0.5 μm and 10 μm, and the needle length is between 10 μm To 100 microns. The reinforced prepreg material described in item 1 of the scope of patent application, wherein each of the multi-needle crystals has a double-needle, three-needle, or four-needle cone structure. The reinforced prepreg material described in item 1 of the scope of patent application, wherein the weight percentage of the mixture in the reinforced prepreg material is 30% to 60%. The reinforced prepreg material described in item 6 of the scope of patent application, wherein the weight percentage of the mixture in the reinforced prepreg material is 35% to 45%. A brake rim wear-resistant layer structure used on the surface of a composite wheel rim. The brake rim wear-resistant layer structure comprises: a fiber fabric, the material of which is liquid crystal polymer fiber; and a mixture, which is mixed with the fiber fabric and contains : A resin; and a plurality of multi-needle crystals mixed with the resin, and each of the multi-needle crystals has a micron or nanometer size, wherein the ratio of the multi-needle crystals to the mixture is 10-25 phr. In the brake rim wear-resistant layer structure described in item 8 of the scope of patent application, the material of each of the multi-needle crystals is zinc oxide, magnesium oxide or zinc sulfide. As described in item 8 of the scope of patent application, each of the multi-needle crystals has a needle diameter and a needle length, the needle diameter is between 0.5 microns and 10 microns, and the needle length is between Between 10 microns and 100 microns. The brake rim wear-resistant layer structure described in item 8 of the scope of patent application, wherein each of the multi-needle crystals has a double-needle, three-needle or four-needle cone structure. In the brake rim wear layer structure described in item 8 of the scope of patent application, the thickness of the brake rim wear layer structure is between 0.1 mm and 0.5 mm. The brake rim wear layer structure described in item 8 of the scope of patent application, wherein the radial outer portion of the composite rim has a first radial width, and the brake rim wear layer structure has a second radial width on the surface of the composite rim The radial width, the second radial width is less than or equal to the first radial width.

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