Heat-dissipating and breathable exhaust insole and preparation method thereof

Abstract

The invention relates to a heat-dissipating and breathable exhaust insole and a preparation method thereof. The insole is obtained by weaving a braided rope, the braided rope is obtained by twisting a plurality of polyamide fiber yarns, and a heat-conducting coating layer is arranged on the surface of at least one polyamide fiber yarn. The heat-conducting coating layer is prepared from the following raw materials in parts by weight: heat-conducting filler, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl double-terminated polydimethylsiloxane, silazane, maleic anhydride graft, a diluent, an inhibitor and platinum water. The dispersity and compatibility of the heat-conducting filler are promoted through silazane and aminopropyl double-terminated polydimethylsiloxane, and then the heat-conducting filler is matched with the methyl vinyl silicone rubber, the carboxyl-terminated polycaprolactone and the maleic anhydride graft, so that a heat-conducting coating layer obtained after curing is stably adhered to the surface of the polyamide fiber yarn; and meanwhile, the insole has better moisture absorption, elasticity and heat conduction performance, so that the woven insole has better air permeability, heat dissipation performance and comfort.

Description

Technical Field

[0001] The present application relates to the field of insoles, and more specifically, to a heat-dissipating and breathable venting insole and a preparation method thereof. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements for the comfort and functionality of footwear. Among them, insoles, as an important part of footwear, have a direct impact on the wearer's foot comfort due to their breathability.

[0003] Most insoles are made of foamed polyurethane, rubber, etc., which have a better cushioning effect, but they are not breathable. Since it is easy to sweat during exercise, and sweat is difficult to be discharged through the soles, it is easy to breed bacteria, affecting use.

[0004] Currently, there are insoles woven with nylon fibers, etc., which form a variety of pores. Although they have certain moisture absorption and perspiration functions, they are still difficult to meet people's needs for dry and breathable feet when worn for a long time or during high-intensity exercise. Summary of the invention

[0005] In order to further improve the air permeability and heat dissipation of the insole, the present application provides a heat-dissipating and breathable venting insole and a preparation method thereof.

[0006] In a first aspect, a heat dissipating and breathable venting insole is provided, wherein the venting insole is woven from a braided rope, wherein the braided rope is twisted from a plurality of polyamide fiber yarns, wherein a heat conductive coating layer is provided on the surface of at least one of the polyamide fiber yarns, and wherein the heat conductive coating layer is made of the following raw materials in parts by weight: Thermal conductive filler 20-30 parts Methyl vinyl silicone rubber 30-50 parts 10-20 parts of carboxyl-terminated polycaprolactone 1-5 parts of aminopropyl dicapped polydimethylsiloxane Silazane 1-8 parts Maleic anhydride grafted 1-3 parts 40-60 parts of diluent Inhibitor 0.01-0.05 parts 3-5 parts of platinum water.

[0007] Methyl vinyl silicone rubber has softness, elasticity, hygroscopicity and adhesion stability, and carboxyl-terminated polycaprolactone is compounded with methyl vinyl silicone rubber to further improve the adhesion stability, softness, hygroscopicity and antibacterial properties of methyl vinyl silicone rubber. Aminopropyl double-terminated polydimethylsiloxane can further cross-link with methyl vinyl silicone rubber to improve adhesion and mechanical properties, while also promoting the dispersion of thermally conductive fillers. Silazane not only improves the dispersion uniformity of thermally conductive fillers, but also can further react with methyl vinyl silicone rubber to further improve the adhesion stability and thermal conductivity of the thermally conductive coating on the surface of polyamide fibers.

[0008] The maleic anhydride graft can promote the compatibility of the raw material system of the thermal conductive coating layer, so that the thermal conductive coating layer can be stably adhered to the surface of the polyamide fiber yarn, reducing the possibility of falling off. And the twisted braided rope has better thermal conductivity, softness, elasticity and hygroscopicity, so that the exhaust insole has better heat dissipation and ventilation effect when worn, and has better antibacterial effect.

[0009] Platinum water is a highly active catalyst for the addition reaction of organic silicon. Its main component is platinum (O) divinyltetramethyldisiloxane solution. It can catalyze the reaction of the raw material system of the thermal conductive coating layer, and can also undergo hydrogenation reaction with organic silicon to achieve cross-linking and curing.

[0010] In summary, the present application promotes the dispersibility and compatibility of thermally conductive fillers through silazane and aminopropyl double-terminated polydimethylsiloxane, and then cooperates with methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, and maleic anhydride grafts, and with the assistance of diluents, inhibitors, and platinum water, the thermally conductive coating layer obtained after curing has stable adhesion to the surface of the polyamide fiber yarn, and has better hygroscopicity, elasticity and thermal conductivity. Therefore, the insole obtained by weaving has better air permeability, heat dissipation performance and comfort. When used in sports shoes, it has better perspiration and ventilation effects, thereby improving the wearing comfort.

[0011] Preferably, the thermally conductive filler is composed of one or more of expanded graphite powder, aluminum diboride powder, and aluminum nitride.

[0012] Expanded graphite powder, aluminum diboride powder, and aluminum nitride have good thermal conductivity, and expanded graphite powder has the functions of softness, compression resilience, adsorption, etc., can absorb moisture, and can further promote the softness of the exhaust insole. Therefore, using one of the expanded graphite powder, aluminum diboride powder, and aluminum nitride can play a role in thermal conductivity, further improve the heat dissipation and air permeability of the exhaust insole, and further improve the dryness and comfort when wearing the insole.

[0013] Preferably, the thermally conductive filler is composed of expanded graphite powder, aluminum diboride powder, and aluminum nitride in a weight ratio of (0.3-0.5):(0.1-0.3):1.

[0014] When expanded graphite powder, aluminum diboride powder and aluminum nitride play a synergistic role, the heat dissipation performance of the exhaust insole is further improved. At the same time, it also plays a better role in air permeability and elasticity, improving the comfort of wearing the insole.

[0015] The expansion multiple of expanded graphite powder is 100 times, and the bulk density of expanded graphite is 0.02-0.05g / cm 3 , thermal conductivity 108-129W / (m·K), worm length 30-50 microns.

[0016] Preferably, the mesh sizes of the expanded graphite powder, the aluminum diboride powder, and the aluminum nitride powder are all 1500-2000 meshes.

[0017] The above mesh size selection has a better dispersing effect, and is easy to adhere to the surface of the polyamide fiber line, and has good compatibility with the thermal conductive coating layer, and is combined with silazane, aminopropyl double-terminated polydimethylsiloxane, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, and maleic anhydride grafts to play a synergistic role, thereby making the thermal conductive coating layer have better softness, hygroscopicity and thermal conductivity, so that the polyamide fiber line obtained by twisting the obtained braided rope can obtain a ventilation insole with better air permeability and heat dissipation performance.

[0018] Preferably, the silazane is 1,1,3,3-tetramethyl-1,3-divinylsilazane and / or hexamethyldisilazane.

[0019] 1,1,3,3-tetramethyl-1,3-divinylsilazane and hexamethyldisilazane are used in combination with aminopropyl double-terminated polydimethylsiloxane to promote the uniform dispersion and compatibility of the thermal conductive filler in the raw material system of the thermal conductive coating layer, and further react with methyl vinyl silicone rubber, so that the prepared heat dissipation coating layer can stably adhere to the surface of the polyamide fiber yarn and play a better role in heat dissipation and breathability.

[0020] Preferably, the maleic anhydride grafted product is ethylene-acrylate-maleic anhydride copolymer and / or maleic anhydride grafted rosin.

[0021] Ethylene-acrylate-maleic anhydride copolymer or maleic anhydride grafted rosin both promote the compatibility of the raw material system of the thermal conductive coating layer, so that the thermal conductive coating layer formed therefrom has better heat dissipation and elasticity, and adheres stably to the surface of the polyamide fiber, reducing the possibility of falling off.

[0022] Preferably, the inhibitor is p-hydroxyanisole; and the diluent is ethyl acetate.

[0023] The above ethyl acetate is used as a diluent, which has a better dilution effect, and has a low boiling point, so the solvent is easy to remove, while p-hydroxyanisole has an inhibitory effect to avoid premature solidification during the sizing process, which affects the use.

[0024] In a second aspect, the present application provides a method for preparing a heat-dissipating and breathable venting insole, characterized in that the method comprises the following steps: 1) Weighing a thermal conductive filler, aminopropyl di-terminated polydimethylsiloxane, and silazane in parts by weight and mixing them uniformly to obtain a mixture A; 2) weighing methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, maleic anhydride grafted product, inhibitor, mixture A, and diluent and mixing them uniformly to obtain mixture B; 3) Weighing platinum water and mixing it evenly with all the mixture B obtained in step 2) to obtain a thermal conductive coating liquid; 4) immersing the polyamide fiber yarn in a heat-conducting coating liquid to form a heat-conducting coating liquid layer on the surface of the polyamide fiber yarn, and solidifying the liquid to form a heat-conducting coating layer on the surface of the polyamide fiber yarn to obtain a polyamide fiber yarn; 5) twisting a plurality of polyamide fiber yarns to form a braided rope, and braiding the braided rope to obtain a venting insole.

[0025] The above process can fully mix the raw materials. The thermal conductive coating liquid obtained in this step is easily sized on the surface of the polyamide yarn and adheres stably thereto after solidification. The obtained insole has better ventilation and heat dissipation effects.

[0026] Preferably, the curing temperature in step 4) is 150-180° C., and the curing time is 50-120 s.

[0027] Within this temperature range, the slurry can be completely solidified and adhered to the insole stably, so that the woven insole can have better ventilation and heat dissipation effects.

[0028] Preferably, the thermal conductive coating liquid has a sizing weight of 20-50 g / m 2 .

[0029] The above sizing humidity range enables the thermal conductive coating liquid to stably adhere to the polyamide fiber and further improve the thermal conductivity and heat dissipation performance.

[0030] In summary, this application has the following beneficial effects: 1. The present application promotes the dispersibility and compatibility of thermally conductive fillers by using silazane and aminopropyl double-terminated polydimethylsiloxane, and then cooperates with methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, and maleic anhydride grafts, and with the assistance of diluents, inhibitors, and platinum water, the thermally conductive coating layer obtained after curing has stable adhesion to the surface of polyamide fiber yarn, and has better hygroscopicity, elasticity and thermal conductivity. Therefore, the insole obtained by weaving has better air permeability, heat dissipation performance and comfort. When used in sports shoes, it has better perspiration and ventilation effects, and improves the wearing comfort.

[0031] 2. 1,1,3,3-tetramethyl-1,3-divinylsilazane and hexamethyldisilazane are used in combination with aminopropyl double-terminated polydimethylsiloxane to promote the uniform dispersion and compatibility of the thermal conductive filler in the raw material system of the thermal conductive coating layer, and further react with methyl vinyl silicone rubber, so that the prepared heat dissipation coating layer can stably adhere to the surface of the polyamide fiber yarn and play a better role in heat dissipation and breathability. DETAILED DESCRIPTION

[0032] The present application is further described in detail below with reference to the embodiments.

[0033] Some raw material description: Aminopropyl dicapped polydimethylsiloxane, average molecular weight 2000-5000; Platinum water, the manufacturer is preferably Dongguan Zhongxin Silicone Material Co., Ltd., item number ZX-T1000, 1000PPM; Methyl vinyl silicone rubber, vinyl content 0.13-0.17%, average molecular weight 50,000-100,000; Ethylene-acrylate-maleic anhydride copolymer, average molecular weight 10,000-30,000, average molecular weight 10,000-30,000, alternating copolymerization of maleic anhydride (MAn) and vinyl acetate (VAc) initiated by benzoyl peroxide (BP); The product name of maleic anhydride grafted rosin is anhydride modified esterified rosin RM100, and its manufacturer model is preferably Shenzhen Yipnuo Chemical Co., Ltd., model RM-100; The average molecular weight of carboxyl-terminated polycaprolactone is 800-2000, and its structural formula is as follows: Example

[0034] Example 1 A heat dissipating and breathable venting insole, the venting insole is obtained by crochet-knitting a braided rope, and the weight of the insole is 630g / m 2The braided rope is obtained by twisting a plurality of polyamide fiber yarns. The number of the polyamide fiber yarns can be 2, 5, 6, 10, 12, 18, 24, 30, 40, 50, etc. The present application preferably has 24 yarns, each yarn is 200D, and a thermal conductive coating layer is provided on the surface of at least one polyamide fiber yarn. In the present embodiment, preferably all polyamide fiber yarns are provided with a thermal conductive coating layer, and the thermal conductive coating layer covers the polyamide fiber yarn.

[0035] The heat dissipation and breathable exhaust insole is prepared by the following method: 1) According to parts by weight, 3 kg of thermal conductive filler, 0.5 kg of aminopropyl dicapped polydimethylsiloxane, and 0.1 kg of silazane were weighed and put into a stirring device, and stirred at a speed of 100 r / min for 10 min to fully mix them to obtain a mixture A.

[0036] 2) Weigh 3 kg of methyl vinyl silicone rubber, 2 kg of carboxyl-terminated polycaprolactone, 0.3 kg of maleic anhydride graft, 0.001 kg of inhibitor, all of the mixture A obtained in step 1), and 4 kg of diluent, put them into a stirring device, stir at a speed of 100 r / min for 20 min to mix them evenly, and obtain a mixture B.

[0037] 3) Weigh 0.3 kg of platinum water and add it to the mixture B obtained in step 2), and continue stirring for 10 minutes to fully mix it to obtain a thermal conductive coating liquid.

[0038] 4) The polyamide fiber yarn is transferred to a tank containing a thermally conductive coating liquid, and the polyamide fiber yarn is completely immersed in the thermally conductive coating liquid and fully in contact with the thermally conductive coating liquid for 10 seconds. A stirring mechanism is provided inside the tank containing the thermally conductive coating liquid to keep the thermally conductive coating liquid in a fully stirred and uniform state, so that a layer of thermally conductive coating liquid is formed on the surface of the polyamide fiber yarn by sizing. The sizing wet weight of the thermally conductive coating liquid is 20 g / m 2 , curing, the curing temperature is 150°C, and the curing time is 120s to form a thermal conductive coating layer on the surface of the polyamide fiber yarn to obtain the polyamide fiber yarn.

[0039] 5) 24-count polyamide fiber yarns are twisted with 50 twists / 10 cm to form a braided rope, and the braided rope is braided to obtain a venting insole.

[0040] The inhibitor is p-hydroxyanisole; the diluent is ethyl acetate; the maleic anhydride graft is ethylene-acrylate-maleic anhydride copolymer; the silazane is 1,1,3,3-tetramethyl-1,3-divinylsilazane; and the thermal conductive filler is expanded graphite powder with a mesh size of 2000.

[0041] Example 2-3 The difference between Example 2-3 and Example 1 is that the amount of raw materials and process parameters are different, as shown in Table 1; Table 1 Raw material dosage (kg) and process parameters of Examples 1-3 Example 4 The difference between Example 4 and Example 2 is that the thermal conductive filler is aluminum diboride powder.

[0042] Example 5 The difference between Example 5 and Example 2 is that the thermal conductive filler is aluminum nitride.

[0043] Example 6 The difference between Example 6 and Example 2 is that the thermal conductive filler is composed of expanded graphite powder and aluminum diboride powder in a weight ratio of 1:1.

[0044] Example 7 The difference between Example 7 and Example 2 is that the thermal conductive filler is composed of expanded graphite powder, aluminum diboride powder, and aluminum nitride in a weight ratio of 0.3:0.1:1.

[0045] Example 8 The difference between Example 8 and Example 2 is that the thermal conductive filler is composed of expanded graphite powder, aluminum diboride powder, and aluminum nitride in a weight ratio of 0.4:0.3:1.

[0046] Example 9 The difference between Example 9 and Example 2 is that the thermal conductive filler is composed of expanded graphite powder, aluminum diboride powder, and aluminum nitride in a weight ratio of 0.5:0.2:1.

[0047] Example 10 The difference between Example 10 and Example 8 is that the silazane is hexamethyldisilazane.

[0048] Embodiment 11 The difference between Example 11 and Example 8 is that the silazane is composed of 1,1,3,3-tetramethyl-1,3-divinylsilazane and hexamethyldisilazane in a weight ratio of 1:0.6.

[0049] Example 12 The difference between Example 12 and Example 11 is that the maleic anhydride grafted material is maleic anhydride grafted rosin.

[0050] Embodiment 13 The difference between Example 13 and Example 11 is that the maleic anhydride grafted material is composed of ethylene-acrylate-maleic anhydride copolymer and maleic anhydride grafted rosin in a weight ratio of 1:0.2.

[0051] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the aminopropyl di-terminated polydimethylsiloxane is replaced by methyl vinyl silicone rubber in an equal amount.

[0052] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that an equal amount of carboxyl-terminated polycaprolactone is replaced by methyl vinyl silicone rubber.

[0053] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that an equal amount of silazane is replaced by methyl vinyl silicone rubber.

[0054] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the maleic anhydride grafted material is replaced by methyl vinyl silicone rubber in equal amounts.

[0055] Performance testing Detection method / test method (1) Breathability The insoles obtained in Examples 1-13 and Comparative Examples 1-4 were tested for air permeability, with reference to moisture absorption and perspiration: GB / T21655.1-2008, and moisture permeability; air permeability: GB / T 5453-1997.

[0056] (2) Heat dissipation performance The thermal conductivity of the insoles obtained in Examples 1-13 and Comparative Examples 1-4 was tested, and the thermal conductivity was determined according to ASTM D7984.

[0057] (3) Adhesion stability The silicone coatings obtained in Examples 1-13 and Comparative Examples 1-4 were tested with reference to GB / T 2792-1998, wherein a 200 g / m 2 The test surface fabric is then cured on the PVC board, and the thermal conductive coating liquid is then applied on the test fabric with a wet coating weight of 100g / m 2 After complete cross-linking and curing, the curing temperature is 155°C, the curing time is 200s, and a thermal conductive coating layer is formed on the test surface fabric, and the peeling force of the thermal conductive coating layer is tested.

[0058] (4) Resilience The thermally conductive coating liquid obtained in Examples 1-13 and Comparative Examples 1-4 was placed in a mold and cured at a temperature of 160° C. for 10 minutes to form a 4 cm test product. The test product was then tested with reference to GB / T 1681-1991 Determination of the resilience of vulcanized rubber.

[0059] The above experiment was tested 3 times and the average value was taken; Table 2 Experimental data of Examples 1-13 and Comparative Examples 1-4 Combining Example 1 and Comparative Examples 1-4 and Table 2, it can be seen that the moisture permeability, air permeability, thermal conductivity, resilience and peel force of Comparative Examples 1-4 are lower than those of Examples 1-4, indicating that the thermal conductive filler, methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl di-terminated polydimethylsiloxane, silazane and maleic anhydride graft are compounded to obtain a thermally conductive coating liquid that can stably adhere to the surface of the polyamide fiber line and play a better soft filling role.

[0060] Combining Example 2 and Example 7 and Table 2, it can be seen that the thermal conductivity of Example 7 is 1.6 W / (m·K) higher than that of Example 2, and the rebound rate of Example 7 is 3.5% higher than that of Example 2. At the same time, the moisture permeability, air permeability and peeling force of Example 7 are also higher than those of Example 2, indicating that when expanded graphite powder, aluminum diboride powder and aluminum nitride are compounded, a synergistic effect is played to further improve the thermal conductivity, and methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, aminopropyl dimethylsiloxy, silazane and maleic anhydride grafts are combined to obtain a thermally conductive coating liquid. When used for surface treatment of polyamide fiber lines, it can adhere stably. When fully cured, a thermally conductive coating layer with stable adhesion is formed on the surface of the polyamide fiber, and the coating layer has better air permeability, moisture permeability and resilience.

[0061] Combining Example 8 and Example 11 and Table 2, it can be seen that the moisture permeability, air permeability, thermal conductivity, resilience, and peel force of Example 11 are all higher than those of Example 8, indicating that the compounding of 1,1,3,3-tetramethyl-1,3-divinylsilazane and hexamethyldisilazane has a synergistic effect and further improves the overall performance.

[0062] Combining Example 13 with Example 11 and Table 2, it can be seen that the moisture permeability, air permeability, thermal conductivity, resilience and peel force of Example 13 are all higher than those of Example 1, indicating that the compounding of ethylene-acrylate-maleic anhydride copolymer and maleic anhydride grafted rosin plays a synergistic role and further improves the comprehensive performance.

[0063] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A heat dissipating and breathable venting insole, characterized in that: The exhaust insole is woven from a braided rope, wherein the braided rope is twisted from a plurality of polyamide fiber yarns, and a heat-conducting coating layer is arranged on the surface of at least one of the polyamide fiber yarns, wherein the heat-conducting coating layer is made of the following raw materials in parts by weight: Thermal conductive filler 20-30 parts 30-50 parts of methyl vinyl silicone rubber 10-20 parts of carboxyl-terminated polycaprolactone 1-5 parts of aminopropyl dicapped polydimethylsiloxane Silazane 1-8 parts Maleic anhydride grafted 1-3 parts 40-60 parts of diluent Inhibitor 0.01-0.05 parts 3-5 parts of platinum water.

2. The heat dissipating and breathable venting insole according to claim 1, characterized in that: The thermal conductive filler is composed of one or more of expanded graphite powder, aluminum diboride powder, and aluminum nitride.

3. The heat dissipating and breathable venting insole according to claim 2, characterized in that: The thermal conductive filler is composed of expanded graphite powder, aluminum diboride powder and aluminum nitride in a weight ratio of (0.3-0.5): (0.1-0.3):

1.

4. The heat dissipating and breathable venting insole according to claim 1, characterized in that: The mesh numbers of the expanded graphite powder, the aluminum diboride powder and the aluminum nitride are all 1500-2000 meshes.

5. The heat dissipating and breathable venting insole according to claim 1, characterized in that: The silazane is 1,1,3,3-tetramethyl-1,3-divinylsilazane and / or hexamethyldisilazane.

6. The heat dissipating and breathable venting insole according to claim 1, characterized in that: The maleic anhydride grafted product is ethylene-acrylate-maleic anhydride copolymer and / or maleic anhydride grafted rosin.

7. The heat dissipating and breathable venting insole according to claim 1, characterized in that: The inhibitor is p-hydroxyanisole; and the diluent is ethyl acetate.

8. A method for preparing the heat dissipating and breathable venting insole according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Weigh thermal conductive filler, aminopropyl di-terminated polydimethylsiloxane, and silazane in parts by weight and mix them evenly to obtain a mixture A; 2) Weigh methyl vinyl silicone rubber, carboxyl-terminated polycaprolactone, maleic anhydride grafted product, inhibitor, mixture A, and diluent and mix them evenly to obtain mixture B; 3) Weigh platinum water and mix it evenly with all the mixture B obtained in step 2) to obtain a thermal conductive coating liquid; 4) immersing the polyamide fiber yarn in a thermally conductive coating liquid to form a thermally conductive coating liquid layer on the surface of the polyamide fiber yarn, and solidifying the liquid to form a thermally conductive coating layer on the surface of the polyamide fiber yarn to obtain a polyamide fiber yarn; 5) Twisting a plurality of polyamide fiber yarns to form a braided rope, and braiding the braided rope to obtain a venting insole.

9. The heat dissipating and breathable venting insole according to claim 8, characterized in that: The curing temperature in step 4) is 150-180° C., and the curing time is 50-120 seconds.

10. The heat dissipating and breathable venting insole according to claim 8, characterized in that: The thermal conductive coating liquid has a sizing wet weight of 20-50 g / m 2 .

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