Preparation method and application of special material for bamboo charcoal fiber insole

Abstract

The invention relates to the field of insole materials, in particular to a preparation method and application of a material special for bamboo charcoal fiber insoles, and the preparation method of the material special for the bamboo charcoal fiber insoles comprises the following steps: step 1, preparing surface-active bamboo charcoal fibers; step 2, preparing bamboo charcoal fibers with epoxidized surfaces; step 3, preparing a polysiloxane modifier; and 4, preparing the special material for the bamboo charcoal fiber insole. The bamboo charcoal fiber material suitable for the insoles is prepared, existing bamboo charcoal fibers are modified, partial hygroscopicity of the bamboo charcoal fibers is weakened, higher strength and better antibacterial and deodorant properties are achieved, wear resistance is obviously enhanced, and the bamboo charcoal fiber material suitable for the insoles is more suitable for being used as an insole material. The insole can inhibit bacteria and deodorize, and does not cover the feet, so that the wearing and using experience of people becomes better.

Description

Technical Field

[0001] The invention relates to the field of insole materials, and in particular to a preparation method and application of a special material for bamboo charcoal fiber insoles. Background Art

[0002] As the direct contact layer between the shoe and the foot, the insole not only bears the heavy responsibility of support, cushioning and comfort, but is also directly related to the health and hygiene of the foot. A good insole should be able to effectively absorb sweat discharged from the foot, prevent bacteria from growing, thereby reducing foot odor and providing the wearer with a dry and comfortable wearing experience.

[0003] Natural fibers such as bamboo charcoal fiber, bamboo fiber, cotton, etc. are widely used in the production of insoles due to their good air permeability and moisture absorption. Cotton insoles are popular for their softness, comfort, moisture absorption and breathability, but their durability and deodorization are not good. Bamboo charcoal is a natural material with good air permeability, strong moisture absorption, and can effectively absorb odor and bacteria. Bamboo charcoal fiber has a unique microporous structure that can quickly absorb and decompose moisture, while releasing negative ions to inhibit bacterial growth and achieve deodorization effects. Therefore, bamboo charcoal fiber insoles have gradually become a hot-selling item on the market.

[0004] Bamboo charcoal insoles have the characteristics of moisture absorption and perspiration, antibacterial and deodorizing, comfortable and breathable. They can not only keep the feet dry and comfortable, but also have antibacterial and deodorizing effects, effectively preventing bacterial infection and odor problems in the feet. In addition, bamboo charcoal also has the function of absorbing odor and improving air quality. It can effectively absorb odor in shoes and improve the shoe wearing environment. However, the bamboo charcoal insoles currently on the market are too hygroscopic, making it easier for bacteria to breed, which reduces the antibacterial and deodorizing effect. In addition, the strength and wear resistance of bamboo charcoal fibers are also insufficient. After a period of use, they are severely worn, resulting in a poor wearing experience. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a special material for bamboo charcoal fiber insoles and application thereof.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] In a first aspect, the present invention provides a method for preparing a special material for bamboo charcoal fiber insoles, comprising the following steps:

[0008] Step 1, surface etching of bamboo charcoal fiber:

[0009] Prepare a sodium hydroxide solution, disperse the bamboo charcoal fibers in the sodium hydroxide solution, soak them, filter, wash and dry them to obtain active bamboo charcoal fibers;

[0010] Step 2, Epoxidation of Bamboo Charcoal Fiber Surface:

[0011] The silane coupling agent KH-560 is dissolved in ethanol, and then the surface-activated bamboo charcoal fiber is immersed in the ethanol, refluxed and condensed, and then filtered, washed and dried to obtain the surface-epoxidized bamboo charcoal fiber;

[0012] Step 3, preparing a polysiloxane modifier:

[0013] Vinyl-terminated dimethylpolysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide are fully mixed, reacted for 1-3 hours under the conditions of ultraviolet light source and initiator, and the solvent is removed under reduced pressure to obtain a polysiloxane modifier;

[0014] Step 4, preparing bamboo charcoal fiber material:

[0015] The polysiloxane modifier is fully dispersed in N,N-dimethylformamide, and then the surface epoxidized bamboo charcoal fiber is added, and the mixture is stirred for 3-7 hours at 60-70°C, and the solvent is removed under reduced pressure. After washing with alcohol, the mixture is dried to obtain a special material for bamboo charcoal fiber insoles.

[0016] Preferably, in step 1, the preparation process of the sodium hydroxide solution is: dissolving sodium hydroxide in deionized water to obtain a sodium hydroxide solution with a mass fraction of 5%-15%.

[0017] Preferably, in step 1, the mass volume ratio of bamboo charcoal fiber to sodium hydroxide solution is 1 g: (10-20) mL.

[0018] Preferably, in step 1, the soaking temperature is 20-40° C., and the soaking time is 5-10 h.

[0019] Preferably, in step 2, the mass volume ratio of the surfactant bamboo charcoal fiber, the silane coupling agent KH-560 and the ethanol is 1 g: (0.1-0.3) g: (22-36) mL.

[0020] Preferably, in step 2, the reflux time is 4-8 hours and the reflux temperature is 50-70°C.

[0021] Preferably, in step 3, the viscosity of the vinyl-terminated dimethyl polysiloxane is 500-1000 mPa.s, and the vinyl content is 0.2-0.5 wt%.

[0022] Preferably, in step 3, the wavelength of the ultraviolet light source is 250-420nm (365nm) and the power is 35-55W.

[0023] Preferably, in step 3, the initiator is photoinitiator 184 or photoinitiator 754.

[0024] Preferably, in step 3, the amount of the initiator used is 2%-6% of the total mass of the vinyl-terminated dimethylpolysiloxane and 4-amino-2-mercaptopyrimidine.

[0025] Preferably, in step 3, the mass volume ratio of vinyl-terminated dimethylpolysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide is (7.2-10.8) g: (0.25-0.5) g: (40-60) mL.

[0026] Preferably, in step 4, the mass volume ratio of the surface epoxidized bamboo charcoal fiber, the polysiloxane modifier and N,N-dimethylformamide is 1 g: (0.16-0.48) g: (20-30) mL.

[0027] In a second aspect, the present invention provides a special material for bamboo charcoal fiber insoles, which is prepared by the above-mentioned preparation method.

[0028] In a third aspect, the present invention provides an application of a special material for bamboo charcoal fiber insoles in the field of insoles.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention prepares a bamboo charcoal fiber material suitable for insoles, and performs modification treatment on the existing bamboo charcoal fiber to weaken its partial hygroscopicity, thereby obtaining not only higher strength and better antibacterial and deodorizing properties, but also significantly enhancing the wear resistance, making it more suitable for use as an insole material, capable of inhibiting bacteria and deodorizing without causing stuffiness to the feet, thereby improving people's wearing experience.

[0031] 2. The texture of the bamboo charcoal fiber material prepared by the present invention is softer than that of ordinary bamboo charcoal fiber, which can ensure the comfort of the soles of the feet; when used as a material for insoles, it can effectively inhibit the growth of bacteria and prevent the generation of odor; in addition, the wear resistance is also greatly improved, and the wear resistance is good, and it is not easy to wear even after long-term wear.

[0032] 3. The process of preparing the bamboo charcoal fiber material of the present invention is to first use an alkali solution to slightly etch the bamboo charcoal fiber to enhance its surface activity, then use an epoxy silane coupling agent to treat it to epoxylate its surface, and then compound it with an amino-containing polysiloxane modifier to cross-link the amino-epoxy groups to obtain the modified bamboo charcoal fiber material.

[0033] 4. The polysiloxane modifier used in the modification process of bamboo charcoal fiber of the present invention is prepared by using vinyl-terminated dimethyl polysiloxane and 4-amino-2-mercaptopyrimidine through a thiol-double bond click reaction. The vinyl and thiol groups generate thioether groups under the action of an initiator, and a pyrimidine group is introduced at the same time, so that the obtained polysiloxane modifier has good antibacterial properties. In addition, it is found through testing that the strength and wear resistance of the bamboo charcoal fiber treated with the polysiloxane modifier are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0035] Figure 1 is a scanning electron microscope (SEM) schematic diagram of the modified bamboo charcoal fiber prepared in Example 1 of the present invention;

[0036] Figure 2 It is a physical schematic diagram of the yarn processed from the modified bamboo charcoal fiber prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0037] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0038] The present invention will be further described below in conjunction with the following examples.

[0039] Example 1

[0040] A method for preparing a special material for bamboo charcoal fiber insoles comprises the following steps:

[0041] (1) 10 g of sodium hydroxide powder was dissolved in 90 mL of deionized water to obtain a sodium hydroxide solution with a mass fraction of 10%, and then Sylon bamboo charcoal fiber with a fineness of 15±2 μm and a length of 35-40 mm was dispersed in the sodium hydroxide solution. The mass volume ratio of the bamboo charcoal fiber and the sodium hydroxide solution was 1 g:15 mL. The mixture was stirred evenly at 30° C., and then soaked for 8 h. After that, the liquid was filtered out, and the fiber was rinsed with pure water until the washing liquid was neutral. The fiber was then placed in an oven at 70° C. and dried to obtain a surface-active bamboo charcoal fiber.

[0042] (2) Add silane coupling agent KH-560 to ethanol, stir until uniform, and then immerse the surface-activated bamboo charcoal fiber in it. The mass volume ratio of the surface-activated bamboo charcoal fiber, the silane coupling agent KH-560 and the ethanol is 1g:0.2g:28mL. The condensed water is refluxed at 60°C for 6h, and then the liquid is filtered to remove, and the surface is rinsed at least three times in sequence and dried to obtain surface epoxidized bamboo charcoal fiber;

[0043] (3) Add vinyl-terminated dimethyl polysiloxane (viscosity of 820 mPa.s, vinyl content of 0.3 wt%) to N,N-dimethylformamide, stir thoroughly, then add 4-amino-2-mercaptopyrimidine, continue stirring until uniform, the mass volume ratio of vinyl-terminated dimethyl polysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide is 8.6 g:0.32 g:50 mL, then add photoinitiator 184 under inert gas protection, the amount of which is 4% of the total mass of vinyl-terminated dimethyl polysiloxane and 4-amino-2-mercaptopyrimidine, use ultraviolet lamp irradiation treatment, the wavelength of the ultraviolet lamp is 365 nm, the power is 45 W, the treatment time is 2 h, and after the reaction is completed, the solvent is removed under reduced pressure to obtain a polysiloxane modifier;

[0044] (4) The polysiloxane modifier is fully dispersed in N, N-dimethylformamide, and then the surface epoxidized bamboo charcoal fiber is added, and the surface epoxidized bamboo charcoal fiber, the mass volume ratio of the surface epoxidized bamboo charcoal fiber, the polysiloxane modifier and the N, N-dimethylformamide is 1g:0.32g:25mL, and the mixture is stirred for 5h at 65°C, and the solvent is removed under reduced pressure. After rinsing with ethanol three times, the modified bamboo charcoal fiber is dried under reduced pressure to obtain the modified bamboo charcoal fiber;

[0045] (5) The modified bamboo charcoal fiber obtained above was spun and used as a material for insoles, with a tex of 33.2 tex, a yarn count of 113*89, and a gram weight of 350±5 g / m 2 .

[0046] Example 2

[0047] A method for preparing a special material for bamboo charcoal fiber insoles comprises the following steps:

[0048] (1) Sodium hydroxide powder is dissolved in deionized water to obtain a sodium hydroxide solution with a mass fraction of 5%, and then bamboo charcoal fibers are dispersed in the sodium hydroxide solution. The mass volume ratio of bamboo charcoal fibers to sodium hydroxide solution is 1 g:10 mL. The mixture is stirred evenly at 20°C, and then immersed for 5 hours. The liquid is then filtered to remove the liquid, and the fibers are rinsed with pure water until the washing liquid is neutral. The fibers are then placed in an oven at 60°C for drying to obtain active bamboo charcoal fibers.

[0049] (2) Take silane coupling agent KH-560 and add it to ethanol. After stirring until uniform, soak the surface-activated bamboo charcoal fiber in it. The mass volume ratio of surface-activated bamboo charcoal fiber, silane coupling agent KH-560 and ethanol is 1g:0.1g:22mL. The condensed water is refluxed at 50°C for 4h, and then the liquid is filtered to remove, and the surface is rinsed at least three times in sequence and dried to obtain surface epoxidized bamboo charcoal fiber;

[0050] (3) Add vinyl-terminated dimethyl polysiloxane (viscosity of 820 mPa.s, vinyl content of 0.3 wt%) to N,N-dimethylformamide, stir thoroughly, then add 4-amino-2-mercaptopyrimidine, continue stirring until uniform, the mass volume ratio of vinyl-terminated dimethyl polysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide is 7.2 g:0.25 g:40 mL, then add photoinitiator 754 under inert gas protection, the amount of which is 2% of the total mass of vinyl-terminated dimethyl polysiloxane and 4-amino-2-mercaptopyrimidine, use ultraviolet lamp irradiation treatment, the wavelength of the ultraviolet lamp is 365 nm, the power is 35 W, the treatment time is 1 h, and after the reaction is completed, the solvent is removed under reduced pressure to obtain a polysiloxane modifier;

[0051] (4) The polysiloxane modifier is fully dispersed in N,N-dimethylformamide, and then the surface epoxidized bamboo charcoal fiber is added, and the mixture is stirred and dispersed evenly again. The mass volume ratio of the surface epoxidized bamboo charcoal fiber, the polysiloxane modifier and the N,N-dimethylformamide is 1g:0.16g:20mL. The mixture is stirred for 3h at 60°C, and the solvent is removed under reduced pressure. After rinsing three times with ethanol, the mixture is dried under reduced pressure to obtain the modified bamboo charcoal fiber.

[0052] Example 3

[0053] A method for preparing a special material for bamboo charcoal fiber insoles comprises the following steps:

[0054] (1) Sodium hydroxide powder is dissolved in deionized water to obtain a sodium hydroxide solution with a mass fraction of 5%, and then bamboo charcoal fibers are dispersed in the sodium hydroxide solution. The mass volume ratio of bamboo charcoal fibers to sodium hydroxide solution is 1 g:10 mL. The mixture is stirred evenly at 20°C, and then immersed for 5 hours. The liquid is then filtered to remove the liquid, and the fibers are rinsed with pure water until the washing liquid is neutral. The fibers are then placed in an oven at 60°C for drying to obtain active bamboo charcoal fibers.

[0055] (2) Take silane coupling agent KH-560 and add it to ethanol. After stirring until uniform, soak the surface-activated bamboo charcoal fiber in it. The mass volume ratio of surface-activated bamboo charcoal fiber, silane coupling agent KH-560 and ethanol is 1g:0.1g:22mL. The condensed water is refluxed at 50°C for 4h, and then the liquid is filtered to remove, and the surface is rinsed at least three times in sequence and dried to obtain surface epoxidized bamboo charcoal fiber;

[0056] (3) Add vinyl-terminated dimethyl polysiloxane (viscosity of 820 mPa.s, vinyl content of 0.3 wt%) to N,N-dimethylformamide, stir thoroughly, then add 4-amino-2-mercaptopyrimidine, continue stirring until uniform, the mass volume ratio of vinyl-terminated dimethyl polysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide is 7.2 g:0.25 g:40 mL, then add photoinitiator 184 under inert gas protection, the amount of which is 6% of the total mass of vinyl-terminated dimethyl polysiloxane and 4-amino-2-mercaptopyrimidine, use ultraviolet lamp irradiation treatment, the wavelength of the ultraviolet lamp is 365 nm, the power is 55 W, the treatment time is 3 h, and after the reaction is completed, the solvent is removed under reduced pressure to obtain a polysiloxane modifier;

[0057] (4) The polysiloxane modifier is fully dispersed in N,N-dimethylformamide, and then the surface epoxidized bamboo charcoal fiber is added, and the mixture is stirred and dispersed evenly again. The mass volume ratio of the surface epoxidized bamboo charcoal fiber, the polysiloxane modifier and the N,N-dimethylformamide is 1g:0.48g:30mL. The mixture is stirred at 70°C for 7h, and the solvent is removed under reduced pressure. After rinsing three times with ethanol, the mixture is dried under reduced pressure to obtain the modified bamboo charcoal fiber.

[0058] Comparative Example 1

[0059] A special material for bamboo charcoal fiber insoles, which is different from Example 1 only in that traditional bamboo charcoal fiber is used.

[0060] Comparative Example 2

[0061] A special material for bamboo charcoal fiber insoles, which is different from Example 1 only in that surface-active bamboo charcoal fiber is used, and the preparation process is the same as step (1) of Example 1.

[0062] Comparative Example 3

[0063] A special material for bamboo charcoal fiber insoles, using modified bamboo charcoal fiber, the difference from Example 1 is only that the preparation method is different:

[0064] The vinyl-terminated dimethylpolysiloxane is fully dispersed in N,N-dimethylformamide, and then bamboo charcoal fiber and azobisisobutyronitrile are added, and stirred again to be evenly dispersed. The mass volume ratio of bamboo charcoal fiber, vinyl-terminated dimethylpolysiloxane, azobisisobutyronitrile and N,N-dimethylformamide is 1g:0.32g:0.002g:25mL. Under the condition of 65°C, stirring is carried out for 5h, the solvent is removed under reduced pressure, and after rinsing with ethanol three times, it is dried under reduced pressure to obtain modified bamboo charcoal fiber.

[0065] Experimental example

[0066] In order to more clearly illustrate the content of the present invention, the present invention conducted three different control experiments for the scheme of Example 1, namely, Comparative Examples 1-3, and carried out corresponding performance tests on the bamboo charcoal fibers obtained in Example 1 and Comparative Examples 1-3, and the test results are listed in Table 1.

[0067] Among them, the test of breaking strength refers to GB / T 13835.5-2009, the test of abrasion resistance (load mass is 797±7g) refers to GB / T 21196.2-2007 to test the abrasion resistance of fabrics made of fibers, the test of moisture regain (20°C, 65RH%) refers to GB / T9994-2018, and the test of antibacterial properties (after washing 10 times) refers to QB / T 2881-2013 and T / CIAA 001-2020.

[0068] Table 1 Detection performance results display

[0069]

[0070] It can be seen from Table 1 that the special material for bamboo charcoal fiber insoles prepared in Example 1 has high strength and good toughness. Although the moisture regain is partially reduced, the wear resistance and antibacterial properties are greatly enhanced. Comparative Example 1 is a conventional fiber control; in Comparative Example 2, since the fiber surface is slightly damaged after treatment and not effectively repaired, the strength and wear resistance are reduced to a certain extent; Comparative Example 3 uses vinyl-terminated dimethyl polysiloxane to initiate polymerization on the fiber surface. Although the strength and wear resistance are slightly higher than those in Comparative Example 1, the improvement is not obvious, and the antibacterial rate and moisture regain are both on a downward trend, indicating that its antibacterial and deodorizing effects cannot be improved. In summary, it can be seen that the special material for bamboo charcoal fiber insoles prepared in Example 1 has the best comprehensive performance.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0072] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a special material for bamboo charcoal fiber insoles, characterized in that: The following steps are involved: Step 1, preparing a sodium hydroxide solution, dispersing bamboo charcoal fibers in the sodium hydroxide solution and soaking them to obtain surface-active bamboo charcoal fibers; Step 2, using silane coupling agent KH-560 to treat the surface-activated bamboo charcoal fiber to obtain surface-epoxidized bamboo charcoal fiber; Step 3, taking vinyl-terminated dimethyl polysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide and fully mixing them, reacting them under the conditions of ultraviolet light source and initiator for 1-3 hours, and removing the solvent under reduced pressure to obtain a polysiloxane modifier; Step 4, dispersing the polysiloxane modifier in N,N-dimethylformamide, and then adding the surface epoxidized bamboo charcoal fiber, stirring for 3-7 hours at 60-70° C., removing the solvent, washing and drying, to obtain the special material for bamboo charcoal fiber insoles.

2. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In step 1, the preparation process of the sodium hydroxide solution is as follows: sodium hydroxide is dissolved in deionized water to obtain a sodium hydroxide solution with a mass fraction of 5% to 15%.

3. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In the step 1, the mass volume ratio of the bamboo charcoal fiber and the sodium hydroxide solution is 1 g: (10-20) mL; the soaking temperature is 20-40° C., and the soaking time is 5-10 h.

4. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: The step 2 is treated in a condensation reflux mode, the reflux time is 4-8h, and the reflux temperature is 50-70°C.

5. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In the step 2, the mass volume ratio of the surfactant bamboo charcoal fiber, the silane coupling agent KH-560 and the ethanol is 1 g: (0.1-0.3) g: (22-36) mL.

6. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In the step 3, the initiator is photoinitiator 184 or photoinitiator 754; the amount of the initiator used is 2%-6% of the total mass of the vinyl-terminated dimethylpolysiloxane and 4-amino-2-mercaptopyrimidine.

7. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In the step 3, the mass volume ratio of vinyl-terminated dimethylpolysiloxane, 4-amino-2-mercaptopyrimidine and N,N-dimethylformamide is (7.2-10.8) g: (0.25-0.5) g: (40-60) mL.

8. The method for preparing a special material for bamboo charcoal fiber insoles according to claim 1, characterized in that: In the step 4, the mass volume ratio of the surface epoxidized bamboo charcoal fiber, the polysiloxane modifier and the N,N-dimethylformamide is 1 g: (0.16-0.48) g: (20-30) mL.

9. A special material for bamboo charcoal fiber insoles, characterized in that: The special material for bamboo charcoal fiber insoles is prepared by the preparation method described in claim 1.

10. An application of a special material for bamboo charcoal fiber insoles, characterized in that: The special bamboo charcoal fiber insole material described in claim 9 is used in the field of insole manufacturing.

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