EVA foamed material, preparation method and application thereof

Abstract

The present application relates to the technical field of EVA foaming material, and particularly relates to an EVA foaming material, a preparation method and application thereof, which comprises the following steps: weighing raw materials according to weight parts, mixing and kneading in a mixer for 5-8 min, mixing and kneading at a temperature of 85 DEG C, obtaining mixed sheets after mixing and kneading, and foaming treatment in a vulcanizing machine, obtaining the EVA foaming material after foaming. The EVA foaming material is prepared by mixing and foaming treatment of EVA, antistatic agent, stearic acid, calcium stearate, crosslinking agent and foaming agent, and adding both the additive based on beta-cyclodextrin-silane combination and the aluminum hydroxide agent based on end-silicone oil modification, so that the EVA foaming material has the effects of optimizing and improving the antistatic property and slip resistance of the product under the condition of low density, and the elasticity and breaking performance of the product are obviously improved under the aging condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of EVA foaming material, in particular to an EVA foaming material, a preparation method and application thereof. BACKGROUND

[0002] EVA foaming material is widely used in shoe materials due to its excellent performance. With the increasing demand of consumers for the performance of shoe products, EVA foaming material has broad development prospects in the future shoe material market. The existing EVA foaming material has poor antistatic property. In order to add an antistatic agent to optimize the antistatic property, interface problems between raw materials are prone to occur, which in turn affects the slip resistance of the product. In addition, the addition of the antistatic agent and other fillers also affects the density of the product. It is difficult to improve the antistatic property and slip resistance of the product under the condition of low density. In addition, the product has poor aging stability. The elasticity and breaking property of the product are obviously deteriorated under aging conditions, which further affects the performance of the product. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the present application is to provide an EVA foaming material, a preparation method and application thereof to solve the problems raised in the background.

[0004] The technical problem solved by the present application adopts the following technical scheme:

[0005] The present application provides a preparation method of an EVA foaming material, comprising the following steps:

[0006] Step one: weigh the raw materials according to the weight parts: 75-85 parts of EVA, 5-8 parts of an antistatic agent, 11-13 parts of an additive based on a combination of beta-cyclodextrin-silane, 5-8 parts of an aluminum hydroxide agent based on end-silicone oil modification, 2-3 parts of stearic acid, 3-5 parts of calcium stearate, 0.5-0.7 parts of a crosslinking agent and 2-3 parts of a foaming agent;

[0007] Step two: sequentially add the above raw materials into a mixing machine and mix for 5-8 minutes, and the mixing temperature is 85℃. After mixing, a mixed sheet is obtained.

[0008] Step three: foam the mixed sheet in a vulcanizing machine. After foaming, an EVA foaming material is obtained.

[0009] Preferably, the temperature of the foaming treatment is 175-180℃, the pressure is 15-20MPa, and the time is 5-8 minutes. The crosslinking agent is cumene hydroperoxide. The foaming agent is azodicarbonamide. The antistatic agent is composed of graphene and carbon fiber in a weight ratio of 3:2.

[0010] Preferably, the preparation method of the additive based on the combination of beta-cyclodextrin-silane is as follows:

[0011] S11: 2-5 parts by weight of ethanol solvent, 5-8 parts by weight of sodium citrate solution and 1-2 parts by weight of trimethoxysilane are uniformly blended to obtain a silane solution;

[0012] S12: The nanocellulose, beta-cyclodextrin and silane solution are uniformly blended and stirred according to a weight ratio of 3:(4-6):(5-8) to obtain a beta-cyclodextrin-silane modified body;

[0013] S13: A hollow glass microsphere-based additive is prepared to obtain a hollow glass microsphere-based additive;

[0014] S14: The hollow glass microsphere-based additive and the beta-cyclodextrin-silane modified body are ball milled according to a weight ratio of 7:(3-5), and after ball milling, are filtered and dried to obtain a beta-cyclodextrin-silane combined additive.

[0015] Preferably, the preparation method of the hollow glass microsphere-based additive is:

[0016] S13a: The hollow glass microspheres are preheated at 55-60°C for 1h to obtain preheated hollow glass microspheres; tetrabutyl titanate, acetone and methyl orthosilicate and triethanolamine are uniformly blended according to a weight ratio of (5-7):(13-15):(2-3):2 to obtain a composite modifier;

[0017] S13b: The preheated hollow glass microspheres and the composite modifier are ultrasonically treated according to a weight ratio of (5-8):15, and after ultrasonic treatment, are filtered and dried to obtain a hollow glass microsphere-based additive.

[0018] Preferably, the mass fraction of the sodium citrate solution is 5-8%; in S13b, the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1h; in S14, the ball milling speed is 1000-1200r / min, and the ball milling is performed for 2h.

[0019] Preferably, the preparation method of the end-silicone oil modified aluminum hydroxide agent is:

[0020] S101: Tris-HCL buffer solution and aqueous ethanol solution are uniformly blended according to a weight ratio of 3:(5-7) to obtain a Tris-alcohol solution;

[0021] Then, aluminum hydroxide, tannic acid and the Tris-alcohol solution are uniformly blended according to a weight ratio of (3-5):2:(5-8) to obtain a modified aluminum hydroxide agent;

[0022] S102: 5-8% of the total weight of the end group silicone oil is added to the end group silicone oil, and 18-22% of the total weight of the end group silicone oil is added to the modified aluminum hydroxide agent for stirring treatment, and after stirring, filtration and drying, the modified aluminum hydroxide agent based on the end group silicone oil is obtained.

[0023] Preferably, the hydrogen content of the end group silicone oil is 1.0-1.5%; the siloxane modifier is gamma-aminopropyl triethoxysilane.

[0024] Preferably, the mass fraction of the aqueous ethanol solution is 55-75%; the pH value of the Tris-HCL buffer is 7.5-8.2; the stirring temperature of the stirring treatment is 50-55℃, the stirring speed is 450-500r / min, and the stirring time is 1h.

[0025] The application also provides a preparation method of an EVA foaming material.

[0026] The application also provides an application of the EVA foaming material.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] The EVA foaming material of the application is prepared by mixing and foaming EVA with antistatic agent, stearic acid, calcium stearate, crosslinking agent and foaming agent, and adding both the beta-cyclodextrin-silane combined additive and the end group silicone oil modified aluminum hydroxide agent, which have a synergistic effect, so that the EVA foaming material has improved antistatic and slip resistance under low density conditions, and the elasticity and breaking performance of the product are also improved under aging conditions.

[0029] The beta-cyclodextrin-silane combined additive is prepared by mixing and matching nanocellulose, beta-cyclodextrin and silane liquid to form a beta-cyclodextrin-silane modified body, in which the nanocellulose is used as a base material, the beta-cyclodextrin has organic and inorganic dual affinity, and can act as a bridge between inorganic and organic substances, and the silane liquid is used as an interface agent to enhance the interface effect between raw materials. The hollow glass microsphere-based additive is prepared by preheating hollow glass microspheres, and then mixing and matching titanium tetrabutoxide, acetone, methyl silicate and triethanolamine to form a composite improved material, which is then subjected to ultrasonic treatment. Through the mixing and matching of raw materials and the mutual improvement of raw materials, the hollow glass microspheres are used as a base system, and then the beta-cyclodextrin-silane modified body is used for improvement and optimization. The beta-cyclodextrin-silane combined additive obtained in this way can enhance the interface connection between raw materials in the system, and can optimize the antistatic and slip resistance of the product under low density conditions, improve the elasticity and breaking performance of the product, and realize the coordinated improvement of performance.

[0030] The end group silicone oil modified aluminum hydroxide agent is prepared by jointly stirring end group silicone oil, siloxane modifier and modified aluminum hydroxide agent, the modified aluminum hydroxide agent is prepared by mixing and optimizing aluminum hydroxide, tannic acid and Tris-alcohol solution, and the obtained end group silicone oil modified aluminum hydroxide agent is reinforced by the additive based on the combination of β-cyclodextrin-silane in the system, and the product is further improved. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] The preparation method of the EVA foaming material in the embodiment includes the following steps:

[0033] Step one: the raw materials are weighed according to the weight parts: 75-85 parts of EVA, 5-8 parts of antistatic agent, 11-13 parts of the additive based on the combination of β-cyclodextrin-silane, 5-8 parts of the aluminum hydroxide agent modified based on end group silicone oil, 2-3 parts of stearic acid, 3-5 parts of calcium stearate, 0.5-0.7 parts of crosslinking agent and 2-3 parts of foaming agent;

[0034] Step two: the above raw materials are sequentially added to a mixer for mixing for 5-8 minutes, and the mixing temperature is 85℃, and the mixing is completed to obtain a mixed sheet;

[0035] Step three: the mixed sheet is foamed in a vulcanizing machine, and the foaming is completed to obtain the EVA foaming material.

[0036] The foaming temperature of the embodiment is 175-180℃, the pressure is 15-20MPa, and the time is 5-8 minutes; the crosslinking agent is cumene hydroperoxide; the foaming agent is azodicarbonamide; and the antistatic agent is composed of graphene and carbon fiber in a weight ratio of 3:2.

[0037] The preparation method of the additive based on the combination of β-cyclodextrin-silane in the embodiment is as follows:

[0038] S11: 2-5 parts by weight of ethanol solvent, 5-8 parts by weight of sodium citrate solution and 1-2 parts by weight of trimethoxysilane are uniformly blended to obtain a silane solution;

[0039] S12: Nanocellulose, beta-cyclodextrin, silane solution are blended and stirred fully according to the weight ratio of 3: (4-6): (5-8), to obtain a beta-cyclodextrin-silane modified body;

[0040] S13: A hollow glass microsphere-based additive body is prepared, to obtain a hollow glass microsphere-based additive body;

[0041] S14: The hollow glass microsphere-based additive body and the beta-cyclodextrin-silane modified body are ball milled according to the weight ratio of 7: (3-5), after ball milling, suction filtration and drying, to obtain a beta-cyclodextrin-silane combined additive.

[0042] The preparation method of the hollow glass microsphere-based additive body of the embodiment is as follows:

[0043] S13a: The hollow glass microspheres are preheated at 55-60°C for 1h to obtain preheated hollow glass microspheres; tetrabutyl titanate, acetone, methyl orthosilicate and triethanolamine are uniformly blended according to the weight ratio of (5-7): (13-15): (2-3): 2 to obtain a composite modifier;

[0044] S13b: The preheated hollow glass microspheres and the composite modifier are ultrasonically treated according to the weight ratio of (5-8): 15, after ultrasonic treatment, suction filtration and drying, to obtain a hollow glass microsphere-based additive body.

[0045] The mass fraction of the sodium citrate solution of the embodiment is 5-8%; the ultrasonic power in S13b is 350-400W, and the ultrasonic treatment time is 1h; the ball milling speed in S14 is 1000-1200r / min, and the ball milling time is 2h.

[0046] The preparation method of the end group silicone oil modified aluminum hydroxide agent of the embodiment is as follows:

[0047] S101: Tris-HCL buffer solution and ethanol aqueous solution are blended fully according to the weight ratio of 3: (5-7) to obtain a Tris-alcohol solution;

[0048] Then, aluminum hydroxide, tannic acid and the Tris-alcohol solution are uniformly blended according to the weight ratio of (3-5): 2: (5-8) to obtain a modified aluminum hydroxide agent;

[0049] S102: 5-8% of the total weight of the end group silicone oil of a siloxane modifier and 18-22% of the total weight of the end group silicone oil of the modified aluminum hydroxide agent are added to the end group silicone oil for stirring treatment, after stirring, suction filtration and drying, to obtain an end group silicone oil modified aluminum hydroxide agent.

[0050] The hydrogen content of the end group silicone oil of the embodiment is 1.0-1.5%; the siloxane modifier is γ-aminopropyltriethoxysilane.

[0051] The mass fraction of the ethanol aqueous solution of the embodiment is 55-75%; the pH value of the Tris-HCL buffer solution is 7.5-8.2; the stirring temperature of the stirring treatment is 50-55℃, the stirring speed is 450-500r / min, and the stirring time is 1h.

[0052] The EVA foaming material of the embodiment is prepared by the preparation method of the EVA foaming material.

[0053] The EVA foaming material of the embodiment is applied to shoes.

[0054] Embodiment 1: a preparation method of an EVA foaming material, comprising the following steps:

[0055] Step one: weigh the raw materials according to the weight parts: 75 parts of EVA, 5 parts of antistatic agent, 11 parts of additive based on β-cyclodextrin-silane combination, 5 parts of aluminum hydroxide agent based on end-silicone oil modification, 2 parts of stearic acid, 3 parts of calcium stearate, 0.5 parts of crosslinking agent, and 2 parts of foaming agent;

[0056] Step two: sequentially add them into the mixing mill and mix for 5min, the mixing temperature is 85℃, and the mixing is completed to obtain the mixed sheet;

[0057] Step three: the mixed sheet is foamed in the vulcanizing machine, and the EVA foaming material is obtained after the foaming is completed.

[0058] The foaming treatment temperature of the embodiment is 175℃, the pressure is 15MPa, and the time is 5min; the crosslinking agent is cumene hydroperoxide; the foaming agent is azodicarbonamide; and the antistatic agent is composed of graphene and carbon fiber in a weight ratio of 3:2.

[0059] The preparation method of the additive based on β-cyclodextrin-silane combination of the embodiment is as follows:

[0060] S11: uniformly blend 2 parts by weight of ethanol solvent, 5 parts by weight of sodium citrate solution, and 1 part by weight of trimethoxysilane to obtain a silane liquid;

[0061] S12: uniformly blend and stir the nanocellulose, β-cyclodextrin, and silane liquid in a weight ratio of 3:4:5 to obtain a β-cyclodextrin-silane modified body;

[0062] S13: prepare an additive based on hollow glass microbeads to obtain an additive based on hollow glass microbeads;

[0063] S14: ball mill the additive based on hollow glass microbeads and the β-cyclodextrin-silane modified body in a weight ratio of 7:3, and after the ball milling is completed, perform suction filtration and drying to obtain an additive based on β-cyclodextrin-silane combination.

[0064] The preparation method of the hollow glass microsphere-based additive of the embodiment is as follows:

[0065] S13a: preheat the hollow glass microspheres at 55℃ for 1h to obtain preheated hollow glass microspheres; blend tetrabutyl titanate, acetone, and methyl orthosilicate and triethanolamine uniformly according to a weight ratio of 5:13:2:2 to obtain a composite modifier;

[0066] S13b: ultrasonically treat the preheated hollow glass microspheres and the composite modifier according to a weight ratio of 5:15, and after the ultrasonic treatment, perform suction filtration and drying to obtain the hollow glass microsphere-based additive.

[0067] The mass fraction of the sodium citrate solution of the embodiment is 5%; the ultrasonic power in S13b is 350W, and the ultrasonic treatment lasts for 1h; the ball milling speed in S14 is 1000r / min, and the ball milling lasts for 2h.

[0068] The preparation method of the end group silicone oil-modified aluminum hydroxide agent of the embodiment is as follows:

[0069] S101: blend Tris-HCL buffer and an ethanol aqueous solution fully according to a weight ratio of 3:5 to obtain a Tris-alcohol solution;

[0070] Then, blend aluminum hydroxide, tannic acid, and the Tris-alcohol solution uniformly according to a weight ratio of 3:2:5 to obtain a modified aluminum hydroxide agent.

[0071] S102: add 5% of the total weight of the end group silicone oil of a siloxane modifier and 18% of the total weight of the end group silicone oil of the modified aluminum hydroxide agent to the end group silicone oil, and perform stirring treatment, and after the stirring treatment, perform suction filtration and drying to obtain the end group silicone oil-modified aluminum hydroxide agent.

[0072] The hydrogen content of the end group silicone oil of the embodiment is 1.0%; the siloxane modifier is γ-aminopropyl triethoxysilane.

[0073] The mass fraction of the ethanol aqueous solution of the embodiment is 55%; the pH value of the Tris-HCL buffer is 7.5; the stirring temperature is 50℃, the stirring speed is 450r / min, and the stirring lasts for 1h.

[0074] The EVA foaming material of the embodiment is prepared by the preparation method of the EVA foaming material.

[0075] The application of the EVA foaming material of the embodiment is that the EVA foaming material is applied to shoes.

[0076] Embodiment 2: a preparation method of an EVA foaming material, including the following steps:

[0077] Step one: weigh the raw materials according to the weight parts: 85 parts of EVA, 8 parts of antistatic agent, 13 parts of additive based on β-cyclodextrin-silane combination, 8 parts of additive based on end group silicone oil modified aluminum hydroxide, 3 parts of stearic acid, 5 parts of calcium stearate, 0.7 parts of crosslinking agent and 3 parts of foaming agent;

[0078] Step two: the above raw materials are sequentially added to the mixing machine and mixed for 8 min, the mixing temperature is 85℃, after mixing, the mixing sheet is obtained;

[0079] Step three: the mixing sheet is foamed in the vulcanizing machine, and the EVA foaming material is obtained after foaming.

[0080] The foaming temperature of this embodiment is 180℃, the pressure is 20MPa, and the time is 8min; the crosslinking agent is cumene hydroperoxide; the foaming agent is azodicarbonamide; the antistatic agent is composed of graphene and carbon fiber according to the weight ratio of 3:2.

[0081] The preparation method of the additive based on β-cyclodextrin-silane combination in this embodiment is:

[0082] S11: 5 parts by weight of ethanol solvent, 8 parts by weight of sodium citrate solution and 2 parts by weight of trimethoxysilane are uniformly blended to obtain a silane solution;

[0083] S12: nanocellulose, β-cyclodextrin and silane solution are uniformly blended and stirred according to the weight ratio of 3:6:8 to obtain a β-cyclodextrin-silane modified body;

[0084] S13: the additive based on hollow glass microspheres is prepared to obtain the additive based on hollow glass microspheres;

[0085] S14: the additive based on hollow glass microspheres and the β-cyclodextrin-silane modified body are ball milled according to the weight ratio of 7:5, and after ball milling, filtration and drying, the additive based on β-cyclodextrin-silane combination is obtained.

[0086] The preparation method of the additive based on hollow glass microspheres in this embodiment is:

[0087] S13a: the hollow glass microspheres are preheated at 60℃ for 1h to obtain preheated hollow glass microspheres; tetrabutyl titanate, acetone and methyl silicate and triethanolamine are uniformly blended according to the weight ratio of 7:15:3:2 to obtain a composite modifier;

[0088] S13b: the preheated hollow glass microspheres and the composite modifier are ultrasonically treated according to the weight ratio of 8:15, and after ultrasonic treatment, filtration and drying, the additive based on hollow glass microspheres is obtained.

[0089] The mass fraction of the sodium citrate solution of the embodiment is 8%; the ultrasonic power of the ultrasonic treatment in S13b is 400 W, and the ultrasonic treatment lasts for 1 h; the ball milling speed of the ball milling treatment in S14 is 1200 r / min, and the ball milling treatment lasts for 2 h.

[0090] The preparation method of the aluminum hydroxide agent modified based on end group silicone oil of the embodiment is as follows:

[0091] S101: Tris-HCL buffer solution and ethanol aqueous solution are blended in a weight ratio of 3:7 to obtain a Tris-alcohol solution;

[0092] Then, aluminum hydroxide, tannic acid and the Tris-alcohol solution are uniformly blended in a weight ratio of 5:2:8 to obtain a modified aluminum hydroxide agent;

[0093] S102: 8% of the total weight of the end group silicone oil is added to the end group silicone oil as a siloxane modifier, and 22% of the total weight of the end group silicone oil is added to the end group silicone oil as a modified aluminum hydroxide agent for stirring treatment. After the stirring treatment, the mixture is filtered and dried to obtain an aluminum hydroxide agent modified based on end group silicone oil.

[0094] The hydrogen content of the end group silicone oil of the embodiment is 1.5%, and the siloxane modifier is γ-aminopropyl triethoxysilane.

[0095] The mass fraction of the ethanol aqueous solution of the embodiment is 75%, the pH value of the Tris-HCL buffer solution is 8.2, the stirring temperature of the stirring treatment is 55°C, the stirring speed is 500 r / min, and the stirring treatment lasts for 1 h.

[0096] The EVA foaming material of the embodiment is prepared by the preparation method of the EVA foaming material.

[0097] The EVA foaming material of the embodiment is applied to shoes.

[0098] Embodiment 3: A preparation method of an EVA foaming material, comprising the following steps:

[0099] Step one: raw materials are weighed according to weight parts: 80 parts of EVA, 6.5 parts of antistatic agent, 12 parts of an additive based on β-cyclodextrin-silane combination, 6.5 parts of an aluminum hydroxide agent modified based on end group silicone oil, 2.5 parts of stearic acid, 4 parts of calcium stearate, 0.6 parts of a crosslinking agent and 2.5 parts of a foaming agent;

[0100] Step two: the above raw materials are sequentially added to a mixing machine for mixing for 6.5 min, the mixing temperature is 85°C, and after the mixing, a mixed sheet is obtained;

[0101] Step three: the mixed sheet is foamed in a vulcanizing machine, and after the foaming, an EVA foaming material is obtained.

[0102] The foaming treatment of the embodiment has a temperature of 178℃, a pressure of 18MPa, and a time of 6.5min; the crosslinking agent is cumene hydroperoxide; the foaming agent is azodicarbonamide; and the antistatic agent is a composite of graphene and carbon fiber in a weight ratio of 3:2.

[0103] The preparation method of the additive based on the combination of beta-cyclodextrin and silane of the embodiment is as follows:

[0104] S11: 3.5 parts by weight of ethanol solvent, 6.5 parts by weight of sodium citrate solution, and 1.5 parts by weight of trimethoxysilane are uniformly blended to obtain a silane solution;

[0105] S12: The nanocellulose, beta-cyclodextrin, and silane solution are uniformly blended and stirred in a weight ratio of 3:5:6.5 to obtain a beta-cyclodextrin-silane modified body;

[0106] S13: A hollow glass microsphere-based additive is prepared to obtain a hollow glass microsphere-based additive;

[0107] S14: The hollow glass microsphere-based additive and the beta-cyclodextrin-silane modified body are ball milled in a weight ratio of 7:4, and after the ball milling is completed, the mixture is suction filtered and dried to obtain an additive based on the combination of beta-cyclodextrin and silane.

[0108] The preparation method of the hollow glass microsphere-based additive of the embodiment is as follows:

[0109] S13a: The hollow glass microspheres are preheated at 58℃ for 1h to obtain preheated hollow glass microspheres; tetrabutyl titanate, acetone, methyl orthosilicate, and triethanolamine are uniformly blended in a weight ratio of 6:14:2.5:2 to obtain a composite modifier;

[0110] S13b: The preheated hollow glass microspheres and the composite modifier are ultrasonically treated in a weight ratio of 6.5:15, and after the ultrasonic treatment is completed, the mixture is suction filtered and dried to obtain a hollow glass microsphere-based additive.

[0111] The mass fraction of the sodium citrate solution of the embodiment is 6.5%; the ultrasonic power in S13b is 375W, and the ultrasonic treatment is performed for 1h; and the ball milling speed in S14 is 1100r / min, and the ball milling is performed for 2h.

[0112] The preparation method of the aluminum hydroxide agent modified based on end-silicone oil of the embodiment is as follows:

[0113] S101: Tris-HCL buffer solution and ethanol aqueous solution are uniformly blended in a weight ratio of 3:6 to obtain a Tris-alcohol solution;

[0114] Then aluminum hydroxide, tannic acid and Tris-alcohol solution were blended uniformly according to the weight ratio of 4:2:6.5 to obtain the modified aluminum hydroxide agent;

[0115] S102: 6.5% of the total weight of the end group silicone oil was added to the end group silicone oil, and 20% of the total weight of the end group silicone oil was added to the modified aluminum hydroxide agent for stirring treatment. After stirring, the filter was dried to obtain the modified aluminum hydroxide agent based on the end group silicone oil.

[0116] The hydrogen content of the end group silicone oil of the embodiment is 1.2%; the siloxane modifier is γ-aminopropyl triethoxysilane.

[0117] The mass fraction of the aqueous ethanol solution of the embodiment is 60%; the pH value of the Tris-HCL buffer is 7.9; the stirring temperature of the stirring treatment is 52.5°C, the stirring speed is 475r / min, and the stirring time is 1h.

[0118] The EVA foaming material of the embodiment is prepared by the preparation method of the EVA foaming material.

[0119] The application of the EVA foaming material of the embodiment is applied to shoes.

[0120] Comparative Example 1:

[0121] Different from Example 3 is that no additive based on β-cyclodextrin-silane combination is added.

[0122] Comparative Example 2:

[0123] Different from Example 3 is that no β-cyclodextrin-silane modified body is added in the preparation of the additive based on β-cyclodextrin-silane combination.

[0124] Comparative Example 3:

[0125] Different from Example 3 is that no nano-cellulose and β-cyclodextrin are added in the preparation of the β-cyclodextrin-silane modified body.

[0126] Comparative Example 4:

[0127] Different from Example 3 is that no additive based on hollow glass microbeads is added in the preparation of the β-cyclodextrin-silane modified body.

[0128] Comparative Example 5:

[0129] Different from Example 3 is that no preheated hollow glass microbeads are added in the preparation of the additive based on hollow glass microbeads.

[0130] Comparative Example 6:

[0131] Different from example 3 is that no composite modifier is added in the preparation of the hollow glass microsphere-based additive.

[0132] Comparative example 7:

[0133] Different from example 3 is that no tetrabutyl titanate and methyl orthosilicate are added in the composite modifier.

[0134] Comparative example 8:

[0135] Different from example 3 is that no end group silicone oil modified aluminum hydroxide agent is added.

[0136] Comparative example 9:

[0137] Different from example 3 is that no siloxane modifier is added in the preparation of the end group silicone oil modified aluminum hydroxide agent.

[0138] Comparative example 10:

[0139] Different from example 3 is that no modified aluminum hydroxide agent is added in the preparation of the end group silicone oil modified aluminum hydroxide agent.

[0140] Comparative example 11:

[0141] Different from example 3 is that no aluminum hydroxide and tannic acid are added in the preparation of the modified aluminum hydroxide agent.

[0142] Comparative example 12:

[0143] Different from example 3 is that no Tris-HCL buffer is added in the Tris-alcohol solution in the preparation of the modified aluminum hydroxide agent.

[0144] The products of examples 1-3 and comparative examples 1-12 are subjected to performance tests of density, antistatic property and skid resistance, and the test results are shown in Table 1.

[0145] Table 1: Test results of density, antistatic property and skid resistance of the products of examples 1-3 and comparative examples 1-12:

[0146]

[0147] As can be seen from comparative examples 1-12 and examples 1-3, the product of example 3 has excellent density, dry friction coefficient and volume resistivity performance, and the product can realize coordinated improvement of low density, slip resistance and antistatic property; the performance of the product is deteriorated to different degrees when one of the additive based on β-cyclodextrin-silane combination and the end group silicone oil modified aluminum hydroxide agent is not added, and the performance of the product of example 3 is the most significant.

[0148] The products of Examples 1-3 and Comparative Examples 1-12 were tested for elasticity and breaking performance under normal conditions and aging-resistant conditions, and the aging-resistant conditions were that the products were aged at 70°C and 100% relative humidity for 168 hours, according to the standard GB / T 3903.7-2019 "Shoe Test Methods Aging Treatment"; the test results are shown in Table 2.

[0149] Table 2: Test results of elasticity and breaking performance of products of Examples 1-3 and Comparative Examples 1-12:

[0150]

[0151] As can be seen from Table 2, the product of Example 3 has low density, slip resistance, and antistatic properties, as well as excellent breaking elongation and elasticity performance, and the aging-resistant stability of the product is significantly improved;

[0152] As can be seen from Comparative Examples 1-12 and Example 3, when one of the β-cyclodextrin-silane combined additive and the end group silicone oil modified aluminum hydroxide agent is not added to the product, the performance of the product deteriorates significantly, and the performance of the product is most significant when both are used in coordination;

[0153] When the β-cyclodextrin-silane modified body is not added to the preparation of the β-cyclodextrin-silane combined additive, the nano-cellulose and β-cyclodextrin are not added to the preparation of the β-cyclodextrin-silane modified body, the hollow glass microsphere-based additive body is not added to the preparation of the β-cyclodextrin-silane modified body, the preheated hollow glass microsphere is not added to the preparation of the hollow glass microsphere-based additive body, the composite improvement material is not added to the preparation of the hollow glass microsphere-based additive body, and the tetrabutyl titanate and methyl silicate are not added to the composite improvement material, the performance of the product deteriorates;

[0154] The hollow glass microsphere-based additive body made of the specific composite improvement material with the preheated hollow glass microsphere, and the β-cyclodextrin-silane combined additive made of the specific β-cyclodextrin-silane modified body, together make the performance of the product most significant;

[0155] When the siloxane modifier is not added to the preparation of the end group silicone oil modified aluminum hydroxide agent, the modified aluminum hydroxide agent is not added to the preparation of the end group silicone oil modified aluminum hydroxide agent, the aluminum hydroxide and tannic acid are not added to the preparation of the modified aluminum hydroxide agent, and the Tris-HCL buffer solution is not added to the Tris-alcohol solution in the preparation of the modified aluminum hydroxide agent, the performance of the product deteriorates, and only the end group silicone oil modified aluminum hydroxide agent made of the modified aluminum hydroxide agent prepared by the method of the present application and the siloxane modifier has the most obvious performance effect, and the preparation method of the modified aluminum hydroxide agent is unique, and other methods cannot achieve the same effect as the present application.

[0156] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

[0157] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and a person skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A method for preparing an EVA foamed material, characterized by, It comprises the following steps: Step one: according to the weight part, the raw material is weighed: 75-85 parts of EVA, 5-8 parts of antistatic agent, 11-13 parts of β-cyclodextrin-silane combined additive, 5-8 parts of end group silicone oil modified aluminum hydroxide agent, 2-3 parts of stearic acid, 3-5 parts of calcium stearate, 0.5-0.7 parts of crosslinking agent and 2-3 parts of foaming agent; The preparation method of the β-cyclodextrin-silane combined additive is: S11: 2-5 parts by weight of ethanol solvent, 5-8 parts by weight of sodium citrate solution and 1-2 parts by weight of trimethoxysilane are uniformly blended to obtain silane solution; S12: nanocellulose, β-cyclodextrin and silane solution are uniformly blended and stirred according to the weight ratio of 3:(4-6):(5-8) to obtain β-cyclodextrin-silane modified body; S13: the preparation method of the hollow glass microsphere based additive is: S13a: the hollow glass microsphere is preheated at 55-60℃ for 1h to obtain preheated hollow glass microsphere; tetrabutyl titanate, acetone and methyl silicate and triethanolamine are uniformly blended according to the weight ratio of (5-7):(13-15):(2-3):2 to obtain composite modifier; S13b: the preheated hollow glass microsphere and the composite modifier are ultrasonically treated according to the weight ratio of (5-8):15, after ultrasonic treatment, filtration and drying, the hollow glass microsphere based additive is obtained; S14: the hollow glass microsphere based additive and the β-cyclodextrin-silane modified body are ball milled according to the weight ratio of 7:(3-5), after ball milling, filtration and drying, the β-cyclodextrin-silane combined additive is obtained; The preparation method of the end group silicone oil modified aluminum hydroxide agent is: S101: Tris-HCL buffer solution and ethanol aqueous solution are uniformly blended according to the weight ratio of 3:(5-7) to obtain Tris-alcohol solution; Then, aluminum hydroxide, tannic acid and Tris-alcohol solution are uniformly blended according to the weight ratio of (3-5):2:(5-8) to obtain modified aluminum hydroxide agent; S102: 5-8% of siloxane modifier based on the total weight of end group silicone oil and 18-22% of modified aluminum hydroxide agent based on the total weight of end group silicone oil are added to the end group silicone oil and stirred, after stirring, filtration and drying, the end group silicone oil modified aluminum hydroxide agent is obtained; Step two: the above raw materials are sequentially added to the mixing machine and mixed for 5-8 minutes, the mixing temperature is 85℃, after mixing, the mixed sheet is obtained; Step three: the mixed sheet is foamed in the vulcanizing machine, after foaming, the EVA foaming material is obtained.

2. The method for preparing an EVA foam material according to claim 1, characterized in that, The foaming temperature is 175-180℃, the pressure is 15-20MPa, and the time is 5-8min.

3. The method for preparing an EVA foam material according to claim 1, characterized in that, The crosslinking agent is dicumyl peroxide; the foaming agent is azodicarbonamide; the antistatic agent is composed of graphene and carbon fiber according to the weight ratio of 3:

2.

4. The method for preparing an EVA foam material according to claim 1, characterized in that, The mass fraction of the sodium citrate solution is 5-8%; the ultrasonic power of the ultrasonic treatment in S13b is 350-400 W, and the ultrasonic treatment lasts for 1 h; the ball milling speed of the ball milling treatment in S14 is 1000-1200 r / min, and the ball milling treatment lasts for 2 h.

5. The method for preparing an EVA foam material according to claim 1, characterized in that, The stirring temperature of the stirring treatment is 50-55 DEG C, the stirring speed is 450-500 r / min, and the stirring treatment lasts for 1 h.

6. The method for preparing an EVA foam material according to claim 1, characterized in that, The hydrogen content of the end group silicon oil is 1.0-1.5%; the siloxane modifier is gamma-aminopropyl triethoxysilane.

7. The method for preparing an EVA foam material according to claim 1, characterized in that, The mass fraction of the ethanol aqueous solution is 55-75%; the pH value of the Tris-HCL buffer solution is 7.5-8.

2.

8. An EVA foamed material, characterized by, An EVA foaming material prepared by the preparation method of any one of claims 1-7.

9. Use of an EVA foamed material, characterized in that, The EVA foaming material of claim 8 is applied to shoes.

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