A shoe sole and shoe with assisted rope descent

Abstract

The application relates to outdoor sports, and discloses a shoe sole and shoe for assisting rope descending, wherein the shoe sole comprises an outsole and an insole, and further comprises a rope descending part; the rope descending part comprises a fixing part and a plurality of alloy contacts; the fixing part comprises a fixing end and a friction end; the fixing end is clamped between the outsole and the insole; the outsole is provided with a through hole on the lateral side of an arch; the friction end is arranged in the through hole; and the plurality of alloy contacts are embedded in the friction end and protrude out of the through hole. When the arch area of the shoe sole is used to step on a rock or hold a rope, the alloy contacts have high hardness, high contact pressure and low abrasion, and the alloy contacts have high friction force on the rock and the rope, so that the stepping stability and the required friction force for rope descending can be maintained for a long time.

Description

Technical Field

[0001] This application relates to outdoor sports footwear, and more particularly to a sole and shoe for rappelling assistance. Background Technology

[0002] Extreme sports and some outdoor sports require rock climbing and rappelling. When performing these actions, the arch area of ​​the foot on the inside of the sole needs to be placed on protruding rocks or clamped on both sides of the rope. The arch area of ​​the sole needs to have a high degree of adhesion to the rocks and ropes.

[0003] Existing outdoor sports shoes have a concave arch on the inside of the sole, and the material is rubber. Therefore, although the curved shape can fit rocks and ropes well, they wear out quickly during rock climbing and rappelling, are easily damaged, and cannot maintain the stability of footing and the friction required for rappelling for a long time. Summary of the Invention

[0004] To improve the stability of the sole and increase the friction during rappelling, a sole and shoe designed to assist in rappelling have been provided.

[0005] The first inventive objective of this invention is achieved through the following technical solution: A type of rappelling aid sole, comprising an outsole and an insole. The sole also includes a rappelling system, which consists of a fixing element and multiple alloy contacts. The fastener includes a fixed end and a friction end. The fixed end is clamped between the outer sole and the inner sole. The outsole has an opening on the outer side of the arch, and the friction end is inserted into the opening. Multiple alloy contacts are embedded in the friction end and protrude through the opening.

[0006] By adopting the above technical solution, when stepping on rocks or holding ropes in the arch area of ​​the shoe sole, the alloy contact has high hardness, strong contact pressure, and is not easily worn, resulting in more friction with rocks and ropes. This can effectively maintain the stability of stepping and the friction required for rappelling.

[0007] Optionally, the fastener is made of TPU material; The cable-lowering component also includes a fixing plate, and the alloy contact is fixed to the fixing plate; The fastener is encased in plastic on the outside of the fastener plate.

[0008] By adopting the above technical solution, TPU material has good bonding strength with commonly used shoe sole materials such as rubber and EVA. Fixing components made of TPU material can be directly bonded and fixed to the shoe sole through rubber vulcanization and EVA foaming, which is convenient and stable.

[0009] Optionally, the TPU material of the fastener is a modified TPU material, and its preparation method is as follows: S1: Polyester polyol and isocyanate are added to a solvent and mixed evenly, and then polymerized to obtain a prepolymer; S2: A medium polymer is obtained by adding a polymerizing agent, which is a sulfonate or oxalate of an amino diol; S3: The medium polymer is neutralized with alkali to obtain polyurethane, which is then mixed and reacted with linear epoxy resin under inert gas protection to obtain modified TPU material.

[0010] By adopting the above technical solution, polyurethane is obtained in a two-step process. The polymerization agent added in the second step is a sulfonate of an amino diol. The resulting polyurethane contains amino groups after neutralization. Furthermore, the amino group reacts with the epoxy bonds in the linear epoxy resin, causing the linear epoxy resin to crosslink with the sides of the polyurethane polymer chain, thereby increasing the crosslinking degree of the TPU material and improving the tear resistance of the TPU. Meanwhile, epoxy resin is mixed into the polyurethane polymer chain in a cross-linking manner. The mixed-in -COC- greatly improves the bonding strength of TPU material to metal and alloy surfaces, and significantly improves the coating stability of TPU to alloy contacts and fixing plates. This makes the cable-dropping components less prone to cracking even after long-term use, especially at the interface between the alloy contact and the TPU material, where they are less likely to tear and separate. The cable-dropping components have a stable performance and a longer service life over the long term.

[0011] Optionally, the 2-amino-2-methyl-1,3-propanediol oxalate or 3-aminopropanediol oxalate may be used.

[0012] By adopting the above technical solution, the carbon chain of the diol is short, making it easier to carry out the second-step addition polymerization reaction, resulting in polyurethane with high functional group degree and good strength. Oxalate decomposes during subsequent heating, leaving little residue, and the epoxy resin has a high crosslinking rate, resulting in TPU with better tear resistance.

[0013] Optionally, the molar ratio of CN to isocyanate in the polymerization agent is (2.3~4.1):100.

[0014] By adopting the above technical solution, the resulting TPU exhibits better tear resistance. Optionally, the reaction temperature of the linear epoxy resin is 122~126℃.

[0015] By adopting the above technical solution, it is easier to mix linear epoxy resin with the polyurethane of this application, and the cross-linking of epoxy resin and polyurethane is easier to occur, the degree of cross-linking is improved, and the resulting TPU has better tear resistance and higher bonding strength to metal alloys.

[0016] Optionally, the alloy contact is a titanium alloy.

[0017] By adopting the above technical solutions, titanium alloys are lighter and have better wear resistance, making them less prone to wear and tear.

[0018] The second objective of this invention is achieved through the following technical solution: A type of shoe that uses the aforementioned rappelling aid sole.

[0019] By adopting the above technical solutions, sports such as rock climbing and rappelling become more convenient and safer.

[0020] In summary, this application has at least the following beneficial effects: 1. When stepping on rocks or holding ropes in the arch area of ​​the shoe sole, the alloy contact has high hardness, strong contact pressure, and is not easily worn, resulting in more friction with rocks and ropes. This can maintain the stability of stepping and the friction required for rappelling for a long time. 2. The fastener is made of TPU material, which can be directly bonded to the shoe sole through rubber vulcanization and EVA foaming, making the fastening method convenient and stable; 3. The modified TPU material has good tear resistance and greatly improves the bonding strength to metal and alloy surfaces, making the cable descent components less prone to cracking even after long-term use. In particular, it is not easy to tear and separate at the interface between the alloy contact and the TPU material. The cable descent components have stable performance and a longer service life in the long term. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the sole from the inner layer of the foot. Figure 2 This is a schematic diagram of the cable-dropping component; Figure 3 This is a cross-sectional view of the cable-dropping component.

[0022] Figure Labels 1. Shoe sole; 11. Outsole; 12. Insole; 13. Descent device; 131. Fixing device; 1311. Fixing end; 1312. Friction end; 132. Fixing plate; 133. Alloy contact. Detailed Implementation

[0023] raw material The polyester polyol is a mixture of polytetramethylene ether glycol and polybutylene adipate glycol in a mass ratio of 7.5:2.5. The isocyanate is toluene diisocyanate; Polytetramethylene ether glycol, polybutylene adipate glycol, toluene diisocyanate, DMF, 2-amino-2-methyl-1,3-propanediol, 3-aminopropanediol, concentrated hydrochloric acid, and oxalic acid are all commercially available industrial-grade products.

[0024] 2-Amino-2-methyl-1,3-propanediol hydrochloride Concentrated hydrochloric acid was prepared to a concentration of 30.2 wt%. 2-Amino-2-methyl-1,3-propanediol was mixed with 30.2 wt% hydrochloric acid at a mass ratio of 1:1.5, and the mixture was stirred at 10 °C for 0.8 h. Sodium chloride was added and stirred until the temperature was raised to 15°C. The temperature was maintained for 5 minutes. The amount of sodium chloride added was 0.25% of the mass of 30.2 wt% hydrochloric acid. The temperature was lowered to 10℃ and maintained for 10 min to allow 2-amino-2-methyl-1,3-propanediol hydrochloride to precipitate. After filtration and drying, 2-amino-2-methyl-1,3-propanediol hydrochloride was obtained.

[0025] 3-Aminopropanediol hydrochloride Concentrated hydrochloric acid was prepared to a concentration of 30.2 wt%. 3-Aminopropanediol and 30.2 wt% hydrochloric acid were mixed at a mass ratio of 1:1.33 and stirred at 10°C for 0.8 h. Sodium chloride was added and stirred until the temperature was raised to 15°C. The temperature was maintained for 5 minutes. The amount of sodium chloride added was 0.25% of the mass of 30.2 wt% hydrochloric acid. The temperature was lowered to 10°C and maintained for 10 minutes to allow 3-aminopropanediol hydrochloride to precipitate. After filtration and drying, 3-aminopropanediol hydrochloride was obtained.

[0026] 2-Amino-2-methyl-1,3-propanediol oxalate Oxalic acid was prepared into a 21 wt% aqueous solution. 2-Amino-2-methyl-1,3-propanediol was mixed with the 21 wt% aqueous solution of oxalic acid at a mass ratio of 1:2.1 and stirred at 10 °C for 0.8 h. Sodium chloride was added and stirred until the temperature was raised to 15°C. The temperature was maintained for 5 minutes. The amount of sodium chloride added was 0.28% of the mass of 30.2 wt% hydrochloric acid. The temperature was lowered to 10℃ and maintained for 10 min to allow 2-amino-2-methyl-1,3-propanediol hydrochloride to precipitate. After filtration and drying, 2-amino-2-methyl-1,3-propanediol hydrochloride was obtained.

[0027] 3-Aminopropanediol oxalate Concentrated hydrochloric acid was prepared into a 21 wt% oxalic acid aqueous solution. 3-aminopropanediol and the 21 wt% oxalic acid aqueous solution were mixed at a mass ratio of 1:2.35 and stirred at 10°C for 0.8 h. Sodium chloride was added and stirred until the temperature was raised to 15°C. The temperature was maintained for 5 minutes. The amount of sodium chloride added was 0.28 times the mass of the 21wt% oxalic acid aqueous solution. The temperature was lowered to 10℃ and held for 10 min to allow 2-amino-2-methyl-1,3-propanediol oxalate to precipitate. After filtration and drying, 2-amino-2-methyl-1,3-propanediol oxalate was obtained.

[0028] Example 1 As attached Figure 1 As shown, the sole 1 of an auxiliary rappelling shoe includes an insole 12 and an outsole 11 from top to bottom.

[0029] The insole 12 is made of EVA material, and the outsole 11 is made of rubber material. A descent device 13 is sandwiched between the insole 12 and the outsole 11, and the descent device 13 is located on the inside of the arch area of ​​the sole 1.

[0030] As attached Figure 2 As shown, the descent member 13 includes a fixing member 131, a fixing plate 132, and an alloy contact 133.

[0031] The fastener 131 is made of TPU material and includes an integrally molded fastening end 1311 and a friction end 1312. The fastening end 1311 faces the insole 12, and the friction end 1312 faces the outsole 11. The size of the fastening end 1311 is larger than that of the friction end 1312. The side of the fastening end 1311 facing the insole 12 is fixed to the insole 12 by bonding with EVA, and the side of the fastening end 1311 facing the outsole 11 is fixed to the outsole 11 by rubber vulcanization.

[0032] As attached Figure 1 and attached Figure 2 As shown, an opening is made on the inner side of the arch area of ​​the outsole 11, and the friction end 1312 is inserted into the opening and is flush with the ground of the sole 1.

[0033] As attached Figure 3 As shown, the fixing plate 132 is plate-shaped and is fixed in the fixing end 1311 by the fixing member 131 with plastic coating.

[0034] The alloy contact 133 is a rod integrally formed with the fixing plate 132, and it is vertically fixed to the side of the fixing plate 132 facing the friction end 1312. The end of the alloy contact 133 extends out of the friction end 1312 by a distance of 0.2~1cm.

[0035] The alloy contact 133 and the fixing plate 132 can be made of titanium alloy, steel, aluminum alloy, etc. Among them, titanium alloy has low density and good wear resistance. Using titanium alloy to make alloy contact 133 and fixing plate 132 makes the sole 1 lighter and the descent component 13 has a longer service life.

[0036] Example 2 A shoe sole for assisted rappelling, which differs from Embodiment 1 in that the fastener is made of the modified TPU material of this application.

[0037] The method for preparing the modified TPU material in this application is as follows.

[0038] S1: Add 40 kg of polyester polyol and 32 kg of toluene diisocyanate to the polymerization reactor, then add 63 kg of DMF to dissolve it. Stir and heat at 150 r / min to 125 °C and react for 3.5 h to obtain a material containing prepolymer. S2: Keep stirring, adjust the temperature to 156℃, and then add the polymerizing agent dropwise to the reactor. The polymerizing agent is 2-amino-2-methyl-1,3-propanediol oxalate, the amount of which is 1.20 kg, and the dropwise addition time is 40 min. After stirring and reacting for 1.2 h, add 0.245 kg of sodium hydroxide solution to neutralize and filter to obtain polyurethane. S3: Add polyurethane and DMF to the modified reactor according to the preparation ratio, heat to 122℃, add linear epoxy resin in an amount of 5.2 kg, mix and react for 10 min, evaporate and remove DMF, then transfer and granulate to obtain modified TPU material.

[0039] Example 3 A shoe sole for assisted descent differs from Example 2 in that the polymerizing agent is 3-aminopropanediol oxalate, the dosage is 0.833 kg, the dripping time is 40 min, and the reaction is maintained by stirring for 1.2 h.

[0040] Example 4 A shoe sole for assisted descent differs from Example 2 in that the polymerizing agent is 2-amino-2-methyl-1,3-propanediol hydrochloride, the amount is 0.866 kg, the dripping time is 40 min, and the reaction is maintained by stirring for 1.2 h.

[0041] Example 5 A shoe sole for assisted descent differs from Example 2 in that the polymerizing agent is 3-aminopropanediol hydrochloride, the amount is 0.781 kg, the dripping time is 40 min, and the reaction is maintained by stirring for 1.2 h.

[0042] Comparative Example 1 The modified TPU material of the shoe sole used for rappelling assistance is prepared as follows.

[0043] S1: Add 40 kg of polyester polyol and 32 kg of toluene diisocyanate to the polymerization reactor, then add 63 kg of DMF to dissolve it. Stir and heat at 150 r / min to 125 °C and react for 3.5 h to obtain a material containing prepolymer. S2: Keep stirring, adjust the temperature to 156℃, and then add the polymerizing agent, triethylamine, to the reactor at a rate of 0.619 kg. The addition time is 40 min. Keep stirring and react for 1.2 h. Filter to obtain TPU material.

[0044] Comparative Example 2 The modified TPU material of the shoe sole used for rappelling assistance is prepared as follows.

[0045] S1: Add 40 kg of polyester polyol and 32 kg of toluene diisocyanate to the polymerization reactor, then add 63 kg of DMF to dissolve it. Stir and heat at 150 r / min to 125 °C and react for 3.5 h to obtain a material containing prepolymer. S2: Keep stirring, adjust the temperature to 156℃, and then add the polymerizing agent, which is triethylamine, at a dosage of 0.619 kg. The addition time is 40 min. Keep stirring and react for 1.2 h. Filter to obtain polyurethane material. S3: Add polyurethane and DMF to the modification reactor at a mass ratio of 1:0.8, heat to 122℃, add linear epoxy resin at a mass ratio of 5.2 kg, mix and react for 10 min, evaporate and remove DMF, then transfer and granulate to obtain modified TPU material.

[0046] Comparative Example 3 The method for preparing the TPU material used in the fastening component of a shoe sole for rappelling assistance is as follows: S1: Add 40 kg of polyester polyol and 32 kg of toluene diisocyanate to the polymerization reactor, then add 63 kg of DMF to dissolve it. Stir and heat at 150 r / min to 125 °C and react for 3.5 h to obtain a material containing prepolymer. S2: Keep stirring, adjust the temperature to 156℃, and then add the polymerizing agent dropwise to the reactor. The polymerizing agent is 2-amino-2-methyl-1,3-propanediol, the amount of which is 0.643 kg, the dropwise addition time is 40 min, and the reaction is carried out with stirring for 1.2 h. S3: Add polyurethane and DMF to the modified reactor according to the preparation ratio, heat to 122℃, add linear epoxy resin in an amount of 5.2 kg, mix and react for 10 min, evaporate and remove DMF, then transfer and granulate to obtain modified TPU material.

[0047] Comparative Example 4 The method for preparing the TPU material used in the fastening component of a shoe sole for rappelling assistance is as follows: S1: Add 40 kg of polyester polyol and 32 kg of toluene diisocyanate to the polymerization reactor, then add 63 kg of DMF to dissolve it. Stir and heat at 150 r / min to 125 °C and react for 3.5 h to obtain a material containing prepolymer. S2: Keep stirring, adjust the temperature to 156℃, and then add the polymerizing agent dropwise to the reactor. The polymerizing agent is 3-aminopropanediol, the dosage is 0.557kg, the dropwise addition time is 40min, and the reaction is kept stirred for 1.2h. S3: Add polyurethane and DMF to the modified reactor according to the preparation ratio, heat to 122℃, add linear epoxy resin in an amount of 5.2 kg, mix and react for 10 min, evaporate and remove DMF, then transfer and granulate to obtain modified TPU material.

[0048] Samples of the TPU materials obtained in Examples 2-5 and Comparative Examples 1-4 were prepared and tested, and tensile strength was measured.

[0049] Tensile strength was tested according to GB / T1040.2-2022.

[0050] The bonding strength was tested using the sample preparation and testing methods in GB / T 13936-2014. 0Cr18Ni11Ti stainless steel was used as the metal material. The TPU material was heated and melted, then adhered to the metal sample plate for sample preparation, followed by testing.

[0051] The test results are shown in Table 1 below.

[0052] Table 1. Detection results of Examples 2-5 and Comparative Examples 1-4 Tensile strength / MPa 43.2 42.8 41.7 42.9 27.7 29.2 28.5 25.8 Bond strength / MPa 31.4 32.1 31.2 31.8 12.5 12.4 14.5 13.9 Referring to Table 1, the tensile strength and adhesion strength to metal materials of the modified TPU materials in Examples 2-5 of this application are significantly better than the tensile strength of the existing TPU material in Comparative Example 1.

[0053] Furthermore, a comparison between Example 2 and Comparative Examples 1-4 reveals that... Compared to Comparative Example 1, linear epoxy resin was added to polyurethane in Comparative Example 2, but its tensile strength and adhesion strength to metal materials did not show a significant improvement. Therefore, it can be seen that the polymer addition agent is one of the key factors in the significant improvement of Example 1 compared to Comparative Example 1. Compared with Comparative Examples 3 and 4, the polymerizing agent was the amino alcohol itself rather than its oxalate or hydrochloride. Although the TPU materials obtained in Comparative Examples 3 and 4 showed a slight improvement in the bonding strength to metal, it was far from sufficient compared with Example 2. In summary, this application uses sulfonates or oxalates of amino diols as polymerization agents to prepare polyurethane, which is then crosslinked with linear epoxy resin after neutralization. Polyurethane is obtained by a two-step method. In the second step, the polymerization agent added is a sulfonate of an amino diol. The resulting polyurethane contains amino groups after neutralization. These amino groups react with the epoxy bonds in the linear epoxy resin, causing the linear epoxy resin to crosslink with the sides of the polyurethane polymer chain. This increases the crosslinking degree of the TPU material, thereby improving the tear resistance of the TPU. At the same time, the epoxy resin is mixed into the polyurethane polymer chain in a crosslinking manner. The mixed-in -COC- greatly improves the bonding strength of the TPU material to metal and alloy surfaces. The coating stability of TPU to alloy contacts and fixing plates is significantly improved. The resulting modified TPU material exhibits significantly improved tensile strength and adhesion strength to metal materials. For cable-stayed components, cracks are less likely to occur during long-term use, especially at the interface between the alloy contact and the TPU material, where tearing and separation are less likely. The cable-stayed components have stable long-term performance and a longer service life.

[0054] Example 6 A shoe sole for assisted descent differs from Example 3 in that the polymerizing agent is 3-aminopropanediol oxalate, the dosage is 0.417 kg, the dripping time is 40 min, and the reaction is maintained by stirring for 1.2 h.

[0055] Example 7 A shoe sole for assisted descent differs from Example 3 in that the polymerizing agent is 3-aminopropanediol oxalate, the dosage is 0.575 kg, the dripping time is 40 min, and the reaction is maintained by stirring for 1.2 h.

[0056] Example 8 A shoe sole for assisted descent differs from Example 3 in that the polymerizing agent is 3-aminopropanediol oxalate, the dosage is 1.03, the dripping time is 40 min, and the reaction is maintained with stirring for 1.2 h.

[0057] Example 9 A shoe sole for assisting rappelling differs from Example 3 in that the polymerizing agent is 3-aminopropanediol oxalate, the dosage is 1.21, the dripping time is 40 min, and the reaction is maintained with stirring for 1.2 h.

[0058] Samples of the TPU materials in Examples 6-9 were prepared and tested. The test results are shown in Table 2 below.

[0059] Table 2. Detection results of Examples 6-9 Tensile strength / MPa 38.0 40.0 41.5 35.0 Bond strength / MPa 26.3 30.8 31.5 27.0 Combining Table 1 and Table 2, In Examples 6, 7, 3, 8, and 9, the amount of 3-aminopropanediol oxalate was continuously increased; The tensile strength of the TPU material used first increased and then decreased, and the TPU material used in Example 3 was the best. The bonding strength of the TPU material used first increased and then decreased, with the TPU material used in Example 3 being the best. Therefore, in this application, the amount of polymerizing agent is controlled according to the amount of CN, and the molar ratio of CN to isocyanate in the polymerizing agent is preferably (2.3~4.1):100.

[0060] Example 10 A shoe sole for assisted rappelling, which differs from Example 3 in that the reaction temperature in S3 is 122°C.

[0061] Example 11 A shoe sole for assisted rappelling, which differs from Example 3 in that the reaction temperature in S3 is 126°C.

[0062] Example 12 A shoe sole for assisted rappelling, which differs from Example 3 in that the reaction temperature in S3 is 160°C.

[0063] Samples of the TPU materials in Examples 10-12 were prepared and tested. The test results are shown in Table 3 below.

[0064] Table 3. Detection results of Examples 10-12 Tensile strength / MPa 42.5 42.9 33.3 Bond strength / MPa 30.0 28.1 20.9 As shown in Table 3, the reaction temperature in S3 not only affects the crosslinking of linear epoxy resin and polyurethane, but also the self-crosslinking of linear epoxy resin. The reaction temperature in S3 of Examples 11 to 13 is continuously increased. The reaction temperature in Examples 10 to 11 is 122℃ to 126℃, and the resulting TPU material has better tensile properties and bonding strength. However, the reaction temperature in Example 12 reaches 160℃, and the linear epoxy resin polymerizes, which changes the distribution of crystalline and non-crystalline regions in the TPU, and reduces its tensile strength and bonding strength.

[0065] In this application, the reaction temperature of S3 is preferably 122~126℃.

[0066] Example 13 A shoe includes an upper and a sole, wherein the sole is one of the embodiments 1 to 12.

[0067] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A shoe sole for assisted rappelling, comprising an outsole (11) and an insole (12), characterized in that: The sole (1) also includes a descent device (13), which includes a fastener (131) and multiple alloy contacts (133). The fastener (131) includes a fixed end (1311) and a friction end (1312). The fixed end (1311) is sandwiched between the outer bottom (11) and the inner bottom (12). The outsole (11) has an opening on the outer side of the arch, and the friction end (1312) is inserted into the opening. Multiple alloy contacts (133) are embedded in the friction end (1312) and the alloy contacts (133) protrude from the through-hole; The fastener (131) is made of TPU material; The cable descent member (13) also includes a fixing plate (132), and the alloy contact (133) is fixed to the fixing plate (132); The fastener (131) is plastic-coated outside the fixing plate (132); The TPU material of the fastener (131) is a modified TPU material, and its preparation method is as follows: S1: Polyester polyol and isocyanate are added to a solvent and mixed evenly, and then polymerized to obtain a prepolymer; S2: A medium polymer is obtained by adding a polymerizing agent, which is a sulfonate or oxalate of an amino diol; S3: The medium polymer is neutralized with alkali to obtain polyurethane, which is then mixed and reacted with linear epoxy resin under inert gas protection to obtain modified TPU material.

2. The sole of a shoe for assisting rappelling according to claim 1, characterized in that, The polymerization agent is 2-amino-2-methyl-1,3-propanediol oxalate or 3-aminopropanediol oxalate.

3. The sole of a shoe for assisting rappelling according to claim 1, characterized in that, The molar ratio of CN to isocyanate in the polymerization agent is (2.3~4.1):

100.

4. The sole of a shoe for assisting rappelling according to claim 1, characterized in that, The reaction temperature of the linear epoxy resin is 122~126℃.

5. The sole of a shoe for assisting rappelling according to claim 1, characterized in that, The alloy contact is a titanium alloy.

6. A shoe, characterized in that: The sole of the shoe used is the rappelling aid as described in any one of claims 1 to 5.

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