Antibacterial high-elastic polyurethane foaming sole and preparation method thereof

Abstract

The invention discloses an antibacterial high-elastic polyurethane foaming shoe sole and a preparation method thereof, and relates to the field of polyurethane, and the antibacterial high-elastic polyurethane foaming shoe sole is prepared from the following raw materials by weight: 60-100 parts of polytetrahydrofuran ether glycol; 10 to 30 parts of polypropylene oxide glycol; 30 to 50 parts of modified diphenylmethane diisocyanate; 10 to 20 parts of isophorone diisocyanate; 10 to 20 parts of gelatin; 100 to 120 parts of water; 5-10 parts of a chain extender; 1-3 parts of a catalyst; and 1-5 parts of a thickening agent. The polyurethane foaming shoe sole has the effect of improving the antibacterial effect of the polyurethane foaming shoe sole.

Description

Technical Field

[0001] The invention relates to the field of polyurethane, in particular to an antibacterial high-elastic polyurethane foamed sole and a preparation method thereof. Background Art

[0002] The design concept of shoes is mainly simple and comfortable, which can meet people's daily needs. With the improvement of people's living standards, the demand for footwear products is no longer limited to wearing comfort, but more attention is paid to its health and environmental protection performance. At present, the insoles on the market are generally made of EVA, polyurethane foam sponge or silicone. Among them, polyurethane foam insoles have good comfort, light weight and good air permeability. However, polyurethane foam insoles usually do not have antibacterial properties and are prone to cause foot diseases.

[0003] Most of the products on the market directly add an appropriate amount of antibacterial agent to the raw materials during the production process to achieve the antibacterial effect. However, since isocyanate, the raw material for the preparation of polyurethane foam insoles, is easily reactive with antibacterial substances containing more active hydrogen, there is a problem of over-reaction between isocyanate and natural antibacterial substances, which leads to increased brittleness and decreased elasticity of polyurethane foam insoles, and they are easily deformed during use.

[0004] Therefore, the need to prepare and design a polyurethane foam sole that can ensure excellent antibacterial effect and good elasticity has become a key issue that needs to be solved urgently. Summary of the invention

[0005] In order to improve the antibacterial effect of polyurethane foam soles, the present application provides an antibacterial high-elastic polyurethane foam sole and a preparation method thereof.

[0006] In the first aspect, the present application provides an antibacterial high-elastic polyurethane foam sole adopts the following technical solution:

[0007] An antibacterial high-elastic polyurethane foam sole is made of the following raw materials in parts by weight: 60-100 parts of polytetramethylene ether glycol; 10-30 parts of polyoxypropylene glycol; 30-50 parts of modified diphenylmethane diisocyanate; 10-20 parts of isophorone diisocyanate; 10-20 parts of gelatin; 100-120 parts of water; 5-10 parts of chain extender; 1-3 parts of catalyst; and 1-5 parts of thickener.

[0008] By adopting the above technical scheme, the present application uses polytetramethylene glycol and polyoxypropylene glycol as soft segment materials, isophorone diisocyanate and modified diphenylmethane diisocyanate as hard segment materials, and gelatin as a compatible material to effectively improve the compatibility and flexibility of the polyurethane foam sole, and uses water as a medium for the polymerization reaction to enhance the foaming pore structure and density of the foam sole. Various raw materials cooperate with each other to improve the resilience of the foam sole.

[0009] Preferably, the preparation method of the modified diphenylmethane diisocyanate is: 10-20 parts by weight of tetramethyldisiloxane and 20-40 parts by weight of dimethylcyclosiloxane are mixed and stirred, and then 5-15 parts by weight of N,N-dimethylethanolamine, 10-20 parts by weight of nano-titanium dioxide and 20-40 parts by weight of diphenylmethane diisocyanate are added, mixed, ultrasonically vibrated, washed and then dried to obtain modified diphenylmethane diisocyanate.

[0010] By adopting the above technical scheme, tetramethylsiloxane and dimethylcyclosiloxane can improve the compatibility of diphenylmethane diisocyanate and nano-titanium dioxide, and siloxane can also react with the isocyanate group in diphenylmethane diisocyanate to form a polyurethane prepolymer terminated with a siloxane group, thereby improving the flexibility of the foamed sole; N,N-dimethylethanolamine reacts with diphenylmethane diisocyanate to form a carbamate bond, thereby increasing the cross-linking degree of the polyurethane network; and nano-titanium dioxide will form microparticles in the polyurethane network, thereby dispersing stress, thereby improving the antibacterial properties and elasticity of the polyurethane foamed sole.

[0011] Preferably, the weight ratio of tetramethyldisiloxane, dimethylcyclosiloxane, nano-titanium dioxide and diphenylmethane diisocyanate is 1:(1.2-1.4):(0.8-0.9):(1.7-1.9).

[0012] By adopting the above technical scheme, tetramethyldisiloxane and dimethylcyclosiloxane as organic silicon compounds can improve the flexibility of polyurethane; nano-titanium dioxide as filler is evenly dispersed in diphenylmethane diisocyanate, which helps to form microparticles in the polyurethane network and enhance the structural stability of the foamed sole; diphenylmethane diisocyanate as the main isocyanate source can react with other components to form a more complex polyurethane network, thereby improving the overall performance of the material.

[0013] Preferably, the gelatin is selected from one of cold water fish skin gelatin, bovine bone gelatin and modified gelatin.

[0014] By adopting the above technical solution, selecting suitable gelatin to combine with polyurethane, the covalent bond of gelatin is bonded to the surface of polyurethane, which can help improve the mechanical properties of polyurethane, thereby improving the mechanical properties of the foamed sole.

[0015] Preferably, the preparation method of the modified gelatin is: after mixing 20-40 parts by weight of cold-water fish skin gelatin with 10-20 parts by weight of deionized water, 5-15 parts by weight of 3,4-dihydroxybenzaldehyde are added and stirring is continued for 1 hour, and then 2-8 parts by weight of 2-methylpyridine-N-borane are added and stirring is continued, precipitated with ice ethanol, washed, and vacuum dried to obtain the modified gelatin.

[0016] By adopting the above technical scheme, the present application selects modified cold-water fish skin gelatin and combines it with polyurethane. 3,4-dihydroxybenzaldehyde contains two hydroxyl groups, and cold-water fish skin gelatin contains amino acids. The combination of the two can increase the cross-linking degree of cold-water fish skin gelatin. 2-methylpyridine-N-borane can promote the reaction between 3,4-dihydroxybenzaldehyde and gelatin, enhance the cross-linking structure, and thus improve the resilience and mechanical strength of the foamed sole.

[0017] Preferably, the weight ratio of the cold-water fish skin gelatin, 3,4-dihydroxybenzaldehyde and 2-methylpyridine-N-borane is (3.2-3.6):1:(0.3-0.4).

[0018] By adopting the above technical scheme, when cold-water fish skin gelatin, 3,4-dihydroxybenzaldehyde and 2-methylpyridine-N-borane are in a specific weight ratio, the three work together to improve the elasticity of the sole and also contribute to the antibacterial property of the sole, thereby increasing the service life of the sole.

[0019] Preferably, the weight ratio of the polytetramethylene ether diol, modified diphenylmethane diisocyanate and modified gelatin is (7.2-8.4):(4.2-4.8):1.

[0020] By adopting the above technical scheme, when polytetramethylene ether diol, modified diphenylmethane diisocyanate and modified gelatin are in a specific weight ratio, polytetramethylene ether diol as a soft segment material reacts with modified diphenylmethane diisocyanate and modified gelatin, which helps to improve the antibacterial property and mechanical strength of the foamed sole.

[0021] Preferably, the molecular weight of the polytetramethylene ether glycol is 1000-1200.

[0022] By adopting the above technical solution and selecting polytetramethylene ether glycol with a suitable molecular weight, the softness of the polyurethane foam sole can be improved, thereby improving the resilience of the foam sole.

[0023] Preferably, the thickener is selected from one of hydroxyethyl cellulose and methyl hydroxyethyl cellulose.

[0024] By adopting the above technical solution, the selection of a suitable thickener can be achieved by forming a network structure through the interaction between thickener molecules and the surfaces of polyurethane and dispersion, thereby increasing the viscosity of the system.

[0025] In the second aspect, the present application provides a method for preparing an antibacterial high-elastic polyurethane foam sole using the following technical solution:

[0026] A method for preparing an antibacterial high-elastic polyurethane foam sole comprises the following steps:

[0027] S1. The polytetrahydrofuran ether diol, polyoxypropylene diol and gelatin are mixed, heated and dissolved, and then cooled to obtain a prepolymer solution;

[0028] S2. The prepolymer liquid, modified diphenylmethane diisocyanate, isophorone diisocyanate, water and a catalyst are mixed and stirred, and a chain extender is added while stirring to carry out a chain extension reaction to obtain a stirred liquid;

[0029] S3. Add the thickener to the stirring liquid, stir and knead, cool and perform compression molding and vulcanization to obtain the antibacterial high-elastic polyurethane foam sole.

[0030] By adopting the above technical solution, various raw materials are mixed in steps, so that the various raw materials can be fully mixed, and then an antibacterial and highly elastic polyurethane foam sole is obtained.

[0031] In summary, this application has the following beneficial technical effects:

[0032] 1. The present application uses polytetramethylene glycol and polyoxypropylene glycol as soft segment materials, isophorone diisocyanate and modified diphenylmethane diisocyanate as hard segment materials, and gelatin as a compatible material to effectively improve the compatibility and flexibility of the polyurethane foam sole. Water is used as a medium for the polymerization reaction to enhance the foaming pore structure and density of the foam sole. Various raw materials cooperate with each other to improve the resilience of the foam sole.

[0033] 2. Tetramethylsiloxane and dimethylcyclosiloxane can improve the compatibility of diphenylmethane diisocyanate and nano-titanium dioxide. At the same time, siloxane can also react with the isocyanate group in diphenylmethane diisocyanate to form a polyurethane prepolymer terminated with a siloxane group, thereby improving the flexibility of the foamed sole. N,N-dimethylethanolamine reacts with diphenylmethane diisocyanate to form a carbamate bond, thereby increasing the cross-linking degree of the polyurethane network. Nano-titanium dioxide will form microparticles in the polyurethane network, which can disperse stress and thus improve the antibacterial properties and elasticity of the polyurethane foamed sole. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0035] Example

[0036] Example 1

[0037] A method for preparing an antibacterial high-elastic polyurethane foam sole comprises the following steps:

[0038] S1. Mix 60 g of polytetramethylene glycol, 10 g of polyoxypropylene glycol and 10 g of gelatin, heat to 60 ° C, stir and dissolve for 2 h, and then cool to room temperature to obtain a prepolymer solution;

[0039] S2. The prepolymer liquid, 30g modified diphenylmethane diisocyanate, 10g isophorone diisocyanate, 100g water and 1g catalyst were mixed and stirred at a temperature of 80 ° C and a speed of 60rad / min for 1h, and 5g of chain extender was added while stirring for chain extension reaction for 2h to obtain a stirred liquid;

[0040] S3. Add 1g of thickener into the stirring liquid, stir at a temperature of 60℃ and a rotation speed of 60rad / min for 30min, then cool to room temperature, transfer to a flat vulcanizer, and perform compression vulcanization at a temperature of 150℃ and a pressure of 40MPa. Then add 0.1kg of temperature-variable powder to obtain an antibacterial and highly elastic polyurethane foam sole.

[0041] Polytetramethylene glycol was purchased from Guangzhou Yisheng Trading Co., Ltd., with a molecular weight of 1000; polyoxypropylene glycol was purchased from Suzhou Senfida Chemical Co., Ltd.; the catalyst was dibutyltin dilaurate; the chain extender was o-aminobenzenesulfonic acid; and the plasticizer was hydroxyethyl cellulose.

[0042] The preparation method of modified diphenylmethane diisocyanate is as follows:

[0043] 10kg of tetramethyldisiloxane and 20kg of dimethylcyclosiloxane were mixed and stirred at a temperature of 50°C and a rotation speed of 90rad / min for 10 minutes, and then 5kg of N,N-dimethylethanolamine, 10kg of nano-titanium dioxide and 20kg of diphenylmethane diisocyanate were added and mixed and stirred for 30 minutes, ultrasonically oscillated for 30 minutes, washed with anhydrous ethanol and dried at a temperature of 65°C for 2 hours to obtain modified diphenylmethane diisocyanate.

[0044] Example 2

[0045] A method for preparing an antibacterial high-elastic polyurethane foam sole comprises the following steps:

[0046] S1. 100 g of polytetramethylene glycol, 30 g of polyoxypropylene glycol and 20 g of gelatin were mixed and heated to 60 ° C and stirred for 2 h to dissolve, and then cooled to room temperature to obtain a prepolymer solution;

[0047] S2. The prepolymer liquid, 50g of modified diphenylmethane diisocyanate, 20g of isophorone diisocyanate, 120g of water and 3g of catalyst were mixed and stirred at a temperature of 80 ° C and a speed of 60rad / min for 1h, and 10g of chain extender was added while stirring for chain extension reaction for 2h to obtain a stirred liquid;

[0048] S3. Add 5 g of thickener into the stirring liquid, stir at a temperature of 60°C and a rotation speed of 60 rad / min for 30 min, then cool to room temperature, transfer to a flat vulcanizer, and perform compression vulcanization at a temperature of 150°C and a pressure of 40 MPa. Then add 0.1 kg of temperature-dependent powder to obtain an antibacterial and highly elastic polyurethane foam sole.

[0049] Polytetramethylene glycol was purchased from Guangzhou Yisheng Trading Co., Ltd., with a molecular weight of 1000; polyoxypropylene glycol was purchased from Suzhou Senfida Chemical Co., Ltd.; the catalyst was dibutyltin dilaurate; the chain extender was o-aminobenzenesulfonic acid; and the plasticizer was methyl hydroxyethyl cellulose.

[0050] The preparation method of modified diphenylmethane diisocyanate is as follows:

[0051] 10kg of tetramethyldisiloxane and 20kg of dimethylcyclosiloxane were mixed and stirred at a temperature of 50°C and a rotation speed of 90rad / min for 10 minutes, and then 5kg of N,N-dimethylethanolamine, 10kg of nano-titanium dioxide and 20kg of diphenylmethane diisocyanate were added and mixed and stirred for 30 minutes, ultrasonically oscillated for 30 minutes, washed with anhydrous ethanol and dried at a temperature of 65°C for 2 hours to obtain modified diphenylmethane diisocyanate.

[0052] Example 3

[0053] A method for preparing an antibacterial high-elastic polyurethane foam sole comprises the following steps:

[0054] S1. 80 g of polytetramethylene glycol, 20 g of polyoxypropylene glycol and 15 g of gelatin were mixed and heated to 60 ° C and stirred for 2 h to dissolve, and then cooled to room temperature to obtain a prepolymer solution;

[0055] S2. The prepolymer liquid, 40g modified diphenylmethane diisocyanate, 15g isophorone diisocyanate, 110g water and 2g catalyst were mixed and stirred at a temperature of 80 ° C and a speed of 60rad / min for 1h, and a chain extender was added while stirring for chain extension reaction for 2h to obtain a stirred liquid;

[0056] S3. Add 3 g of thickener into the stirring liquid, stir at a temperature of 60°C and a rotation speed of 60 rad / min for 30 minutes, then cool to room temperature, transfer to a flat vulcanizer, and perform compression vulcanization at a temperature of 150°C and a pressure of 40 MPa. Then add 0.1 kg of temperature-dependent powder to obtain an antibacterial and highly elastic polyurethane foam sole.

[0057] Polytetramethylene glycol was purchased from Guangzhou Yisheng Trading Co., Ltd., with a molecular weight of 1000; polyoxypropylene glycol was purchased from Suzhou Senfida Chemical Co., Ltd.; the catalyst was dibutyltin dilaurate; the chain extender was o-aminobenzenesulfonic acid; and the plasticizer was hydroxyethyl cellulose.

[0058] The preparation method of modified diphenylmethane diisocyanate is as follows:

[0059] 10kg of tetramethyldisiloxane and 20kg of dimethylcyclosiloxane were mixed and stirred at a temperature of 50°C and a rotation speed of 90rad / min for 10 minutes, and then 5kg of N,N-dimethylethanolamine, 10kg of nano-titanium dioxide and 20kg of diphenylmethane diisocyanate were added and mixed and stirred for 30 minutes, ultrasonically oscillated for 30 minutes, washed with anhydrous ethanol and dried at a temperature of 65°C for 2 hours to obtain modified diphenylmethane diisocyanate.

[0060] Example 4

[0061] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that: the preparation method of modified diphenylmethane diisocyanate is:

[0062] 20kg of tetramethyldisiloxane and 40kg of dimethylcyclosiloxane were mixed and stirred at a temperature of 50°C and a rotation speed of 90rad / min for 10 minutes, and then 15kg of N,N-dimethylethanolamine, 10kg of nano-titanium dioxide and 40kg of diphenylmethane diisocyanate were added and mixed and stirred for 30 minutes, ultrasonically oscillated for 30 minutes, washed with anhydrous ethanol, and dried at a temperature of 65°C for 2 hours to obtain modified diphenylmethane diisocyanate.

[0063] Example 5

[0064] A method for preparing an antibacterial high-elastic polyurethane foam sole is different from Example 3 in that: the input amount of tetramethyldisiloxane is 20g, the input amount of dimethylcyclosiloxane is 24g, the input amount of nano-titanium dioxide is 16g, and the input amount of diphenylmethane diisocyanate is 34g.

[0065] Example 6

[0066] A method for preparing an antibacterial high-elastic polyurethane foam sole is different from Example 3 in that: the input amount of tetramethyldisiloxane is 20g, the input amount of dimethylcyclosiloxane is 28g, the input amount of nano-titanium dioxide is 18g, and the input amount of diphenylmethane diisocyanate is 38g.

[0067] Example 7

[0068] A method for preparing an antibacterial high-elastic polyurethane foamed sole is different from Example 3 in that: an equal amount of cold-water fish skin gelatin is replaced with modified gelatin, wherein the preparation method of the modified gelatin is as follows: 20g of cold-water fish skin gelatin and 10g of deionized water are mixed and stirred at a temperature of 55°C for 1h, 5g of 3,4-dihydroxybenzaldehyde is added, stirring is continued for 1h, and then 2g of 2-methylpyridine-N-borane is added, stirring is continued for 6h, precipitation is performed with ice ethanol, washing is performed, and vacuum drying is performed to obtain the modified gelatin.

[0069] Example 8

[0070] A method for preparing an antibacterial high-elastic polyurethane foamed sole, which is different from Example 3 in that: an equal amount of cold-water fish skin gelatin is replaced with modified gelatin, wherein the preparation method of the modified gelatin is as follows: 40g of cold-water fish skin gelatin and 20g of deionized water are mixed and stirred at a temperature of 55°C for 1h, 15g of 3,4-dihydroxybenzaldehyde is added, stirring is continued for 1h, 8g of 2-methylpyridine-N-borane is added, stirring is continued for 6h, precipitation is performed with ice ethanol, washing is performed, and vacuum drying is performed to obtain the modified gelatin.

[0071] Example 9

[0072] A method for preparing an antibacterial high-elastic polyurethane foam sole is different from Example 3 in that: in the process of preparing modified gelatin, the input amount of cold water fish skin gelatin is 32g, the input amount of 3,4-dihydroxybenzaldehyde is 10g, and the input amount of 2-methylpyridine-N-borane is 3g.

[0073] Example 10

[0074] A method for preparing an antibacterial high-elastic polyurethane foam sole is different from Example 3 in that: in the process of preparing modified gelatin, the input amount of cold water fish skin gelatin is 36g, the input amount of 3,4-dihydroxybenzaldehyde is 10g, and the input amount of 2-methylpyridine-N-borane is 4g.

[0075] Embodiment 11

[0076] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that: the input amount of polytetramethylene ether diol is 72g, the input amount of modified diphenylmethane diisocyanate is 42g, and the input amount of modified gelatin is 10g.

[0077] Example 12

[0078] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that: the input amount of polytetramethylene ether diol is 84g, the input amount of modified diphenylmethane diisocyanate is 48g, and the input amount of modified gelatin is 10g.

[0079] Comparative Example

[0080] Comparative Example 1

[0081] A method for preparing an antibacterial high-elastic polyurethane foam sole, which is different from Example 3 in that an equal amount of modified diphenylmethane diisocyanate is replaced by diphenylmethane diisocyanate.

[0082] Comparative Example 2

[0083] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that an equal amount of modified diphenylmethane diisocyanate is replaced by hexamethylene diisocyanate.

[0084] Comparative Example 3

[0085] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that an equal amount of gelatin is replaced by modified diphenylmethane diisocyanate.

[0086] Comparative Example 4

[0087] A method for preparing an antibacterial high-elastic polyurethane foamed shoe sole, which is different from Example 3 in that an equal amount of modified diphenylmethane diisocyanate is replaced by isophorone diisocyanate.

[0088] Performance testing:

[0089] Rebound resilience test: According to GB / T6670-97 standard, the antibacterial high-elastic polyurethane foam soles prepared in Examples 1-12 and Comparative Examples 1-4 were tested using a falling ball rebound tester and cured by adding a cross-linking agent to test the rebound performance of the antibacterial high-elastic polyurethane foam soles.

[0090] Tensile strength test: According to GB / T528-1998, the antibacterial high-elastic polyurethane foam soles prepared in Examples 1-12 and Comparative Examples 1-4 were tested using a universal tensile testing machine and then cured by adding a crosslinking agent, and then the tensile strength of the waterborne polyurethane was tested.

[0091] Antibacterial test: According to ASTM E2149-10 "Determination of the antibacterial behavior of steady-state antibacterial agents under dynamic contact conditions", the detection index is Escherichia coli ATCC25922, and the antibacterial high-elastic polyurethane foam soles prepared in Examples 1-12 and Comparative Examples 1-4 are tested to test their antibacterial effects on Escherichia coli.

[0092]

[0093]

[0094] According to the data comparison of Examples 1-4 and Comparative Examples 1-4, the present application uses polytetramethylene glycol and polyoxypropylene glycol as soft segment materials, isophorone diisocyanate and modified diphenylmethane diisocyanate as hard segment materials, and gelatin as a compatible material to effectively improve the compatibility and flexibility of the polyurethane foam sole, and water as a medium for the polymerization reaction to enhance the foaming pore structure and density of the foam sole. Various raw materials cooperate with each other to improve the resilience of the foam sole.

[0095] According to the data comparison of Examples 3-6, it can be obtained that tetramethyldisiloxane and dimethylcyclosiloxane as organic silicon compounds can improve the flexibility of polyurethane; nano-titanium dioxide as a filler is evenly dispersed in diphenylmethane diisocyanate, which helps to form microparticles in the polyurethane network and enhance the structural stability of the foamed sole; diphenylmethane diisocyanate as the main isocyanate source can react with other components to form a more complex polyurethane network, thereby improving the overall performance of the material.

[0096] According to the data comparison of Examples 6-8, the present application selects modified cold-water fish skin gelatin to be combined with polyurethane. 3,4-dihydroxybenzaldehyde contains two hydroxyl groups, and cold-water fish skin gelatin contains amino acids. The combination of the two can increase the cross-linking degree of cold-water fish skin gelatin. 2-methylpyridine-N-borane can promote the reaction between 3,4-dihydroxybenzaldehyde and gelatin, enhance the cross-linking structure, and thus improve the resilience and mechanical strength of the foamed sole.

[0097] According to the data comparison of Examples 8-10, when cold-water fish skin gelatin, 3,4-dihydroxybenzaldehyde and 2-methylpyridine-N-borane are in a specific weight ratio, the three work together to improve the elasticity of the sole and also contribute to the antibacterial properties of the sole, thereby increasing the service life of the sole.

[0098] According to the data comparison of Examples 10-12, when polytetramethylene ether diol, modified diphenylmethane diisocyanate and modified gelatin are in a specific weight ratio, polytetramethylene ether diol as a soft segment material reacts with modified diphenylmethane diisocyanate and modified gelatin, which helps to improve the antibacterial properties and mechanical strength of the foamed sole.

[0099] The embodiments of the present application are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An antibacterial high-elastic polyurethane foam sole, characterized in that: The invention comprises the following raw materials in parts by weight: 60-100 parts of polytetramethylene glycol; 10-30 parts of polyoxypropylene glycol; 30-50 parts of modified diphenylmethane diisocyanate; 10-20 parts of isophorone diisocyanate; 10-20 parts of gelatin; 100-120 parts of water; and 5-10 parts of a chain extender. Catalyst 1-3 parts; thickener 1-5 parts.

2. The antibacterial high-elastic polyurethane foam sole according to claim 1, characterized in that: The preparation method of the modified diphenylmethane diisocyanate comprises the following steps: 10-20 parts by weight of tetramethyldisiloxane and 20-40 parts by weight of dimethylcyclosiloxane are mixed and stirred, and then 5-15 parts by weight of N,N-dimethylethanolamine, 10-20 parts by weight of nano-titanium dioxide and 20-40 parts by weight of diphenylmethane diisocyanate are added, mixed, ultrasonically vibrated, washed and then dried to obtain the modified diphenylmethane diisocyanate.

3. The antibacterial high-elastic polyurethane foam sole according to claim 2, characterized in that: The weight ratio of tetramethyldisiloxane, dimethylcyclosiloxane, nano-titanium dioxide and diphenylmethane diisocyanate is 1: (1.2-1.4): (0.8-0.9): (1.7-1.9).

4. The antibacterial high-elastic polyurethane foam sole according to claim 1, characterized in that: The gelatin is selected from one of cold-water fish skin gelatin, cattle bone gelatin and modified gelatin.

5. The antibacterial high-elastic polyurethane foam sole according to claim 4, characterized in that: The preparation method of the modified gelatin comprises the following steps: mixing 20-40 parts by weight of cold-water fish skin gelatin and 10-20 parts by weight of deionized water, adding 5-15 parts by weight of 3,4-dihydroxybenzaldehyde, and continuing to stir for 1 hour, then adding 2-8 parts by weight of 2-methylpyridine-N-borane, and continuing to stir, washing after precipitation with ice ethanol, and vacuum drying to obtain the modified gelatin.

6. The antibacterial high-elastic polyurethane foam sole according to claim 4, characterized in that: The weight ratio of the cold-water fish skin gelatin, 3,4-dihydroxybenzaldehyde and 2-methylpyridine-N-borane is (3.2-3.6):1:(0.3-0.4).

7. The antibacterial high-elastic polyurethane foam sole according to claim 4, characterized in that: The weight ratio of the polytetramethylene ether diol, modified diphenylmethane diisocyanate and modified gelatin is (7.2-8.4): (4.2-4.8):

1.

8. The antibacterial high-elastic polyurethane foam sole according to claim 1, characterized in that: The molecular weight of the polytetramethylene ether glycol is 1000-1200.

9. The antibacterial high-elastic polyurethane foam sole according to claim 1, characterized in that: The thickener is selected from one of hydroxyethyl cellulose and methyl hydroxyethyl cellulose.

10. A method for preparing an antibacterial high-elastic polyurethane foam sole, characterized in that: The method for preparing the antibacterial high-elastic polyurethane foam sole according to any one of claims 1 to 9 comprises the following steps: S1. The polytetrahydrofuran ether diol, polyoxypropylene diol and gelatin are mixed, heated and dissolved, and then cooled to obtain a prepolymer solution; S2. The prepolymer liquid, modified diphenylmethane diisocyanate, isophorone diisocyanate, water and a catalyst are mixed and stirred, and a chain extender is added while stirring to carry out a chain extension reaction to obtain a stirred liquid; S3. Add the thickener to the stirring liquid, stir and knead, cool and perform compression molding and vulcanization to obtain the antibacterial high-elastic polyurethane foam sole.

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