Riding self-locking sole material capable of resisting bending fatigue test and preparation method of riding self-locking sole material

Abstract

The invention discloses a bending fatigue test resistant riding self-locking sole material and a preparation method thereof. The sole material is prepared by mixing a polyamide matrix, special nylon, carbon fibers, a flexibilizer, a surface lubrication aid, a heat stabilizer and color masterbatch or toner according to a certain proportion. The preparation method comprises the following steps: carrying out main feeding on the polyamide matrix and the special nylon, carrying out side feeding on the carbon fibers, and carrying out auxiliary feeding on the flexibilizer, the surface lubricating auxiliary, the heat stabilizer and the color master batch or toner through an auxiliary feeding port; and adding the raw materials into a double-screw extruder according to a certain proportion, and carrying out melting, extrusion, granulation and drying. The polyamide riding self-locking shoe sole material takes polyamide 6, polyamide 66, polyamide 6 / 66 or a mixture thereof as a matrix and carbon fibers as a main structural support framework, so that the high bending modulus of the sole material is improved, and the sole material is ensured to pass a bending fatigue resistance test by using the flexibilizer, so that the sole material has excellent mechanical properties. The product provided by the invention meets the functionality and comfort required by the sole material of the riding self-locking shoe.

Description

Technical Field

[0001] The invention belongs to the technical field of bending fatigue test resistant materials, and relates to a bending fatigue test resistant, hard polyamide cycling self-locking shoe sole material with high bending modulus and a preparation method thereof, and specifically relates to a bending fatigue test resistant cycling self-locking shoe sole material and a preparation method thereof. Background Art

[0002] Self-locking shoes usually need to be used with self-locking pedals. They can fix the sole of the foot on the pedal, which can prevent the sole of the foot from slipping and improve stability. Self-locking shoes can improve the speed and physical efficiency of the rider, so that the force can be more fully exerted, and the foot will not be shaken off the pedal. The rider can reach the most standard pedaling position with self-locking shoes, and the foot is less likely to slip off the pedal. The force is transmitted to the pedal by riding self-locking shoes. In order to reduce the loss of force in this process, the harder the sole is, the higher the efficiency will be. If the sole is elastic or soft, part of the force will be absorbed, and the rider will have more effort when pedaling. At the same time, when riding a bicycle with self-locking shoes, when one foot is in the pedaling state, the other foot can do the lifting action because the shoe is fixed to the pedal, which is equivalent to exerting force on both legs at the same time, which will increase the pedaling efficiency to a certain extent. The self-locking function is particularly useful for competitive events such as road cycling and triathlon. Proper use of self-locking shoes can improve the pedaling efficiency by about 30%. In addition, wearing self-locking shoes can also prevent the accident of slipping caused by too high a pedaling frequency, and increase riding safety at high pedaling frequencies. Self-locking shoes have hard soles, which are convenient for force transmission and have little loss of work. If you ride a bicycle wearing ordinary sports shoes, the soles of the shoes have soft sponges, which is equivalent to stepping on springs, which will produce a large loss of force and have a relatively low efficiency of work.

[0003] The hard polyamide cycling self-locking shoe sole material uses polyamide 6, polyamide 66, polyamide 6 / 66, or a mixture thereof as a matrix and carbon fiber as a main structural support skeleton to improve the high bending modulus of the sole material and facilitate the conduction of the sole force; a toughening agent is used to ensure that the sole material passes a bending fatigue resistance test and will not break due to frequent pedaling during cycling; the product of the present invention meets the functionality and comfort requirements of the cycling self-locking shoe sole material. Summary of the invention

[0004] The invention aims to provide a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test and having high bending modulus and a preparation method thereof.

[0005] The technical solution of the present invention is:

[0006] A hard polyamide cycling self-locking shoe sole material, the sole material comprises components and the weight percentage of each component is:

[0007] Polyamide matrix 52% to 86%;

[0008]

[0009] Preferably, the polyamide matrix is ​​any one of polyamide 6, polyamide 66 or polyamide 6 / 66, or a mixture of any two or more thereof.

[0010] Preferably, the special nylon is a non-crystalline nylon (polyamide) resin having high temperature resistant structural properties, namely PA6I / 6T.

[0011] Preferably, the carbon fiber is a structural support skeleton, and the diameter of the carbon fiber is between 5 μm and 30 μm, which can increase the bending modulus of the sole material and facilitate the conduction of the sole force.

[0012] Preferably, the surface lubricating agent is any one or two of ethylene bisstearic acid amide, polar functional group grafted ethylene bisstearic acid amide, and pentaerythritol stearate.

[0013] Preferably, the toughening agent is any one of maleic anhydride grafted polyethylene octene co-elastomer, maleic anhydride grafted acrylic acid or maleic anhydride grafted ethylene propylene diene monomer.

[0014] Preferably, the stabilizer is any one of N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, tris(2,4-di-tert-butylphenyl)phosphite or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0015] Preferably, the masterbatch or toner is any one of an organic masterbatch or an organic toner.

[0016] The second invention object of the present invention is to provide a method for preparing a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test, and the preparation method is specifically: a polyamide matrix and special nylon are fed through the main feed, carbon fiber is fed through the side feed, a toughening agent, a surface lubricating agent, a heat stabilizer, and a masterbatch or color powder are fed through the auxiliary agent feeding port, and each raw material is added to a twin-screw extruder in a certain proportion for melting, extrusion, granulation, and drying.

[0017] Preferably, the melt processing temperature of the twin-screw extruder is controlled between 230 and 280°C, the aspect ratio of the twin-screw extruder is 40:1, the extrusion temperature of the twin-screw extruder head is controlled between 240 and 260°C, and the twin-screw extruder adopts zoned melting and extrusion, and the set temperature of each zone is: 230 to 250°C from zone 1 to zone 2, 240 to 260°C from zone 3 to zone 4, 245 to 265°C from zone 5 to zone 7, and 250 to 280°C from zone 8 to zone 10, and the set temperature and the melt processing temperature are both less than 10°C.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention provides a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test and a preparation method thereof. The polyamide cycling self-locking shoe sole material uses polyamide 6, polyamide 66, polyamide 6 / 66 or a mixture thereof as a matrix and carbon fiber as a main structural support skeleton to improve the high bending modulus of the sole material and facilitate the conduction of the sole force; a toughening agent is used to ensure that the sole material passes the bending fatigue test and will not break due to frequent pedaling during cycling. The product of the present invention meets the functionality and comfort requirements of the cycling self-locking shoe sole material.

[0020] 2. The sole made of the rigid polyamide cycling self-locking shoe sole material for bending fatigue resistance test of the present invention meets the following test requirements: the performance of the sole under continuous bending is measured to determine the bending fatigue resistance of the sole. Before the test, the sole is positioned through the rigid polyamide cycling self-locking shoe sole fixing holes, and the two ends of the sole specimen are fixed between the fixtures. During the test, one end of the fixture is fixed and the other end is movable, and the sole is bent due to the convex movement of the machine shaft, with a bending angle of 90°. After a certain number of tests, the sole is removed to check the bending changes.

[0021] 3. The product performance of the hard polyamide cycling self-locking shoe sole material of the present invention for bending fatigue resistance test meets the following requirements: simply supported beam notched impact ≥ 15Kj / m 2 , tensile strength ≥130MPa, flexural modulus ≥6400MPa. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The soles in the following embodiments are all prepared by using the above-mentioned specific preparation process.

[0024] Example 1

[0025] The following is a detailed description of a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test and a preparation method thereof in conjunction with an embodiment of the present invention:

[0026] A polyamide cycling self-locking shoe sole material, the sole material comprises components and the weight percentage of each component is:

[0027]

[0028] The polyamide matrix is ​​polyamide 6.

[0029] The impact modifier (toughener) is a mixture of maleic anhydride grafted ethylene acrylic acid copolymer and maleic anhydride grafted ethylene octene copolymer.

[0030] The antioxidant (stabilizer) is a compound of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2,4-di-tert-butylphenyl]phosphite.

[0031] The surface lubricant (surface lubricating aid) is ethylene bis fatty amide.

[0032] The masterbatch is an organic black masterbatch.

[0033] Among them, the melt processing temperature of the twin-screw extruder is between 230 and 260°C, the aspect ratio of the twin-screw extruder is 40:1, the extrusion temperature of the twin-screw extruder head is 240 to 250°C, and the twin-screw extruder adopts zoned melting and extrusion, and the set temperature of each zone is: 230 to 240°C from zone 1 to zone 2, 240 to 250°C from zone 3 to zone 4, 245 to 255°C from zone 5 to zone 7, and 250 to 260°C from zone 8 to zone 10, and the processing temperature is less than 10°C between the set temperature and the melt processing temperature.

[0034] Example 2

[0035] The difference from Example 1 is that the raw materials in Example 1 are replaced with raw materials with the following contents:

[0036]

[0037] Example 3

[0038] The difference from Example 2 is that the raw materials in Example 2 are replaced by raw materials with the following contents:

[0039]

[0040] Example 4

[0041] The difference from Example 3 is that the raw materials in Example 3 are replaced by raw materials with the following contents:

[0042] Example 5

[0043] The difference from Example 4 is that the raw materials in Example 4 are replaced by raw materials with the following contents:

[0044] Example 6

[0045] The difference from Example 5 is that the raw materials in Example 5 are replaced by raw materials with the following contents:

[0046] Example 7

[0047] The difference from Example 6 is that the raw materials in Example 6 are replaced by raw materials with the following contents:

[0048]

[0049]

[0050] The following table shows the test results of various properties in Examples 1 to 7.

[0051] Table 1 Performance test results

[0052]

[0053] It can be seen from Examples 1 to 7 that the sole material of the hard polyamide cycling self-locking shoe is based on polyamide 6 and uses 30% by weight of carbon fiber as the main structural support skeleton, which improves the high bending modulus of the sole material and facilitates the conduction of the sole force; the toughening agent is used to ensure that the sole material passes the bending fatigue test and will not break due to frequent pedaling during cycling; with the increase in the amount of toughening agent added, the number of 90° bending fatigue tests on the sole parts increases significantly, but the reduction in the bending modulus is not conducive to the conduction of the sole force.

[0054] Example 8

[0055] The following is a detailed description of a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test and a preparation method thereof in conjunction with an embodiment of the present invention:

[0056] A polyamide cycling self-locking shoe sole material, the sole material comprises components and the weight percentage of each component is:

[0057]

[0058] The polyamide matrix is ​​polyamide 66.

[0059] The impact modifier is a mixture of maleic anhydride grafted acrylic acid and maleic anhydride grafted ethylene propylene diene monomer.

[0060] The antioxidant is a compound of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2,4-di-tert-butylphenyl]phosphite.

[0061] The surface lubricant is modified ethylene bis fatty amide.

[0062] Among them, the melt processing temperature of the twin-screw extruder is between 250 and 280°C, the aspect ratio of the twin-screw extruder is 40:1, the extrusion temperature of the twin-screw extruder head is 260 to 270°C, and the twin-screw extruder adopts zoned melting and extrusion, and the set temperature of each zone is: 250 to 260°C from zone 1 to zone 2, 255 to 265°C from zone 3 to zone 4, 260 to 270°C from zone 5 to zone 7, and 270 to 280°C from zone 8 to zone 10, and the processing temperature is less than 10°C between the set temperature and the melt processing temperature.

[0063] Example 9

[0064] The difference from Example 8 is that the raw materials in Example 8 are replaced by raw materials with the following contents:

[0065]

[0066] Example 10

[0067] The difference from Example 9 is that the raw materials in Example 9 are replaced by raw materials with the following contents:

[0068]

[0069] Embodiment 11

[0070] The difference from Example 9 is that the raw materials in Example 9 are replaced by raw materials with the following contents:

[0071]

[0072]

[0073] Example 12

[0074] The difference from Example 9 is that the raw materials in Example 9 are replaced by raw materials with the following contents:

[0075]

[0076] The following table shows the test results of various properties in Examples 8 to 12.

[0077] Table 2 Performance test results

[0078]

[0079] It can be seen from Examples 8 to 12 that the hard polyamide cycling self-locking shoe sole material is based on polyamide 66, and a toughening agent of 4% by weight is used to ensure that the sole material passes the bending fatigue test and will not break due to frequent pedaling during cycling. Carbon glass fiber is used as the main structural support skeleton. With the increase in the amount of carbon glass fiber added, the high bending modulus of the sole material is improved, which is more convenient for the conduction of the sole force.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hard polyamide cycling shoe sole material resistant to bending fatigue test, characterized by: The components and weight percentages of the components included in the sole material are as follows:

2. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The polyamide matrix is ​​any one of polyamide 6, polyamide 66 or polyamide 6 / 66, or a mixture of any two or more thereof.

3. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The special nylon is a non-crystalline nylon (polyamide) resin having high temperature resistant structural properties, namely PA6I / 6T.

4. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The carbon fiber is a structural support skeleton.

5. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The carbon fiber has a diameter of 5 μm to 30 μm.

6. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The surface lubricating agent is any one or two of ethylene bis stearic acid amide, polar functional group grafted ethylene bis stearic acid amide, and pentaerythritol stearate.

7. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The toughening agent is any one of maleic anhydride grafted polyethylene octene co-elastomer, maleic anhydride grafted acrylic acid or maleic anhydride grafted ethylene propylene diene monomer.

8. The hard polyamide cycling shoe sole material resistant to bending fatigue test according to claim 1, characterized in that: The heat stabilizer is any one or two of N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, tris(2,4-di-tert-butylphenyl)phosphite or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

9. A method for preparing a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test, characterized in that: The method comprises the following steps: adding a polyamide matrix, special nylon, carbon fiber, toughening agent, surface lubricating agent, heat stabilizer and masterbatch or color powder into a twin-screw extruder according to a certain proportion, melting, extruding, granulating and drying.

10. The method for preparing a hard polyamide cycling self-locking shoe sole material resistant to bending fatigue test according to claim 9, characterized in that: The melting temperature is 230° C. to 280° C., and the twin-screw extruder adopts zoned melting and extrusion.

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