Preparation method of polyurethane material for tire manufacturing and product

Abstract

In the preparation method of the polyurethane material for tire manufacturing and the product, a polyurethane prepolymer, namely a material I, is prepared from dihydric alcohol and diisocyanate, the content of-NCO in the material I is 19%-30%, a material P is prepared from a chain extender, the dihydric alcohol, a catalyst, water and a heat-conducting fluid according to respective mass limits, and the material P is prepared from the polyurethane prepolymer, the material P and the heat-conducting fluid according to respective mass limits. The preparation method comprises the following steps: preparing a material I and a material P, mixing and stirring the material I and the material P to obtain a mixed system, controlling the mass ratio of the material P to the material I to be 100: (70-90) and the R value to be 0.98-1.05, immediately pouring the mixed system into a mold when the volume of the mixed system begins to expand, and curing and molding at the external environment temperature of 40-50 DEG C to obtain the polyurethane material. According to the design, not only can the heat-conducting filler be introduced into the polyurethane material, but also the viscosity of a system cannot be increased by introducing the heat-conducting filler, and the structural uniformity and the heat-conducting efficiency of the polyurethane material can be improved.

Description

Technical Field

[0001] The present invention relates to a manufacturing process of polyurethane materials, belonging to the field of polyurethane materials, and particularly relates to a preparation method and product of polyurethane materials for tire manufacturing. Background Art

[0002] As an energy-saving and environment-friendly means of transportation, electric bicycles have gradually become one of the important choices for people's daily travel. Tires are the only key components that directly contact the ground on electric bicycles, and their safety and environmental protection have always been the research directions of the tire industry.

[0003] The application of traditional pneumatic tires in electric bicycles is restricted due to problems such as repeated inflation and flat tire safety hazards. In recent years, with the rise of shared bicycles, the rapid development of non-pneumatic microcellular solid tires has been promoted. Polyurethane materials have significant advantages in the preparation of non-pneumatic microcellular solid tires due to their environmentally friendly casting process characteristics. This preparation process is environmentally friendly, produces no harmful substances, and is more in line with the concept of green development, making polyurethane materials the preferred material for preparing such tires. However, due to inherent defects such as poor heat resistance and serious dynamic heat generation in polyurethane materials, it severely restricts their practical application in the field of electric bicycles.

[0004] The Chinese patent application with the application number 202210806179.4 and the application date of July 8, 2022, discloses a modified synthesis method for suppressing the internal heat generation of polyurethane materials, including three steps: activation of inorganic particles, modification of activated inorganic particles using titanate coupling agents, and preparation of polyurethane filled with titanate coupling agent-modified inorganic particles. It mainly uses titanate coupling agent-modified inorganic particles to improve the use performance of polyurethane materials, reduce dynamic internal heat generation, improve thermal conductivity, and extend service life, but it has the following defects: When introducing inorganic nanoparticles as thermal conductive fillers in this design, due to the lack of solvent, this introduction will increase the viscosity of the entire reaction system, which will not only reduce the mobility of molecular chains, cause incomplete reactions, resulting in low molecular weight and uneven structure of the finally obtained polyurethane materials, but also make the inorganic nanoparticles prone to agglomeration, inhibit the phase separation process of polyurethane, reduce crystallinity, resulting in reduced heat resistance and dynamic performance, thus reducing the overall thermal conductivity.

[0005] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The object of the present invention is to overcome the defects and problems in the prior art that introducing heat-conducting fillers will increase the viscosity of the system and reduce the structural uniformity and heat-conducting efficiency of polyurethane materials, and to provide a preparation method and product of polyurethane materials for tire manufacturing that introducing heat-conducting fillers will not increase the viscosity of the system and can improve the structural uniformity and heat-conducting efficiency of polyurethane materials.

[0007] To achieve the above object, the technical solution of the present invention is: a preparation method of polyurethane materials for tire manufacturing, and the preparation method includes the following steps: The first step: First, vacuum dehydrate the dried oligomeric diol under a negative pressure of 100-130 °C, then cool the dehydrated diol to 40-60 °C, and then add diisocyanate under nitrogen protection for stirring reaction. After the reaction temperature rises to 65-90 °C, continue stirring reaction for 2-3 h to obtain a polyurethane prepolymer, that is, material I. The content of -NCO in this material I is 19%-30%, and during the whole stirring reaction process, the external environmental temperature is maintained at 40-60 °C; The second step: First, mix the chain extender, diol, catalyst, water, and heat-conducting fluid and stir evenly to obtain material P, then add the above-mentioned material I to material P and start stirring to obtain a mixed system. The mass ratio of material P to material I is 100:70-90, and the R value is controlled at 0.98-1.05. Then, during the stirring process, when the volume of the mixed system starts to expand, immediately pour the mixed system into a mold, and then cure and form at an external environmental temperature of 40-50 °C to obtain polyurethane materials.

[0008] In the second step, if the content of each component in material P is in parts by mass, then the chain extender is 5-15 parts, the diol is 85-95 parts, the catalyst and water together are 0.5-2 parts, and the rest is the heat-conducting fluid, and the mass of the heat-conducting fluid is 1%-50% of the mass of the polyurethane material.

[0009] In the first step, if the content of each component in material I is in parts by mass, then the diol is 60-40 parts, and the diisocyanate is 40-60 parts.

[0010] In the first step, the conditions for vacuum dehydration under negative pressure are: the negative pressure is 0.098-0.18 MPa, and the dehydration time is 2-3 h.

[0011] In the first step, the reaction time for adding diisocyanate for stirring reaction is 0.5-1.5 h.

[0012] In the second step, the preparation process of the heat-conducting fluid includes the following steps: Step A: Disperse the thermally conductive nano-fillers in water to obtain a dispersion with a mass percentage concentration of 1% - 30%. Meanwhile, dissolve DC5700 in methanol to obtain a methanol solution with a mass percentage concentration of 10% - 40%. Step B: First, add the methanol solution dropwise to the dispersion, where the mass of DC5700 is 0.1% - 20% of the mass of the thermally conductive nano-fillers. Then, stir and react until precipitates appear and no longer increase. Next, wash the precipitates and dry them at 40 - 80 °C to obtain an intermediate product of the thermally conductive filler. Step C: First, dissolve the above-mentioned intermediate product of the thermally conductive filler and NPES in chloroform, where the molar ratio of DC5700 to NPES is 1:1 - 1:3. Then, react for 3 - 24 h, and extract several times with deionized water to remove the excess NPES, presenting as upper and lower layers of water and organic solvent. Next, pour off the upper layer of water, and then dry the lower layer of organic solvent at 40 - 80 °C to obtain the thermally conductive fluid.

[0013] The thermally conductive filler is any one or any mixture of alumina, magnesia, zinc oxide, boron nitride, carbon nanotubes, and graphene. Among them, before using boron nitride, carbon nanotubes, and graphene, they need to be acidified or treated with sodium hydroxide to make their surfaces rich in hydroxyl groups.

[0014] In the first step, the diol is any one or any mixture of polypropylene glycol, polytetrahydrofuran glycol, polyethylene glycol, polyethylene adipate, polybutylene adipate, and polycarbonate diol.

[0015] In the first step, the diisocyanate is any one or any mixture of diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, p-phenylene diisocyanate, naphthalene diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate.

[0016] A polyurethane material, which is the final product prepared by the above-mentioned preparation method of the polyurethane material for tire manufacturing.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the preparation method and product of the polyurethane material for tire manufacturing of the present invention, first, a polyurethane prepolymer, namely I material, is made using diol and diisocyanate. Then, P material is made using a chain extender, diol, catalyst, water, and thermally conductive fluid. Then, the I material and P material are mixed and stirred to obtain a mixed system. When the volume of the mixed system starts to expand, immediately pour the mixed system into a mold and cure it to form a polyurethane material. The advantages of this design include: First point: This design introduces a heat-conducting fluid into the final polyurethane material, so that the heat-conducting fluid forms a heat-conducting network in the polyurethane material, which can conduct internal heat in time, thereby reducing endogenous heat while synergistically enhancing heat dissipation, thereby increasing the service life of the tire made of polyurethane material; Second point: The heat-conducting fluid used in this design has a self-lubricating effect and can flow like a liquid at room temperature. Therefore, after adding the heat-conducting fluid in the process of making polyurethane materials, it will not increase the viscosity of the reaction system, but can make the heat-conducting fluid more evenly distributed, and can make the synthesized polyurethane molecular chain structure more uniform and the performance more excellent. At the same time, the heat-conducting fluid can also be dispersed more evenly without agglomeration, making it easier to conduct heat; Third point: This design not only introduces heat-conducting fluids, but also uses polyurethane prepolymers, chain extenders, diols, catalysts, and water (the amount of water used is very low). Among them, diols constitute the soft segment of the polyurethane molecular chain, and chain extenders and diisocyanates constitute the hard segment of the polyurethane molecular chain. The hard segment or soft segment of the polyurethane molecular chain can form hydrogen bonds with the heat-conducting fluid to achieve uniform dispersion of the heat-conducting filler in the system, creating a foundation for the introduction of heat-conducting fluids. Therefore, the present invention can not only introduce thermally conductive fillers without increasing the viscosity of the system, thereby improving the structural uniformity and thermal conductivity of the polyurethane material, but also can provide a manufacturing environment basis for the introduction of thermally conductive fluids, thereby improving the reaction efficiency of the introduction.

[0018] 2. In a preparation method and product of a polyurethane material for tire manufacturing of the present invention, when preparing a heat-conducting fluid, firstly disperse the heat-conducting nanofiller in water to obtain a dispersion, and at the same time, dissolve DC5700 in methanol to obtain a methanol solution, and then add the methanol solution dropwise to the dispersion, stir to react to obtain a precipitate, and then wash and dry to obtain an intermediate product of the heat-conducting filler, and then dissolve the intermediate product of the heat-conducting filler and NPES in chloroform to react, and then extract, and then pour out the water in the upper layer after extraction, and finally dry the organic solvent in the lower layer to obtain the heat-conducting fluid. The advantages of this design include: First point: This design can produce a heat-conducting fluid, which includes a core-shell structure. The shell is composed of a long chain of organic molecules to generate fluidity, and the core is a heat-conducting nanofiller that can maintain its nano properties and heat-conducting function. Therefore, in the process of making polyurethane materials, it can not only play the effect of introducing heat-conducting function, but also will not increase the viscosity of the entire reaction system; Second point: For the heat-conducting fluid produced in this design, its core is heat-conducting filler, and its shell is a long organic molecular chain composed of DC5700 and NPES. This kind of long organic molecular chain can form hydrogen bonds with the hard segments or soft segments of polyurethane molecular chains, with a relatively high degree of fitness, so as to achieve the uniform dispersion of heat-conducting filler in the system, and will not cause an increase in the viscosity of the reaction system, nor affect the chain extension process of polyurethane; Therefore, the present invention can produce a heat-conducting fluid that is relatively compatible with polyurethane molecular chains, which is beneficial to reducing the viscosity of the entire reaction system and improving the structural uniformity and heat-conducting efficiency of the final polyurethane material.

[0019] 3. In the preparation method and product of a polyurethane material for tire manufacturing according to the present invention, it mainly includes two steps: the preparation of polyurethane prepolymer and the mixing of Material I and Material P to obtain the polyurethane material. There are not only fewer steps, but also strong connectivity between the steps. Moreover, each step is easy to operate and does not involve harsh preparation conditions such as high temperature and high pressure. It is easy to operate and is also conducive to popularization and application. Therefore, the present invention not only has clear preparation steps, but also has a low operation difficulty. Brief Description of the Drawings

[0020] Figure 1 is the preparation flow chart of the polyurethane material in the present invention.

[0021] Figure 2 is the synthesis flow chart of the heat-conducting fluid in the present invention. Detailed Embodiments

[0022] The present invention will be further described in detail below in conjunction with the description of the drawings and detailed embodiments.

[0023] See Figure 1 — Figure 2 , a preparation method of a polyurethane material for tire manufacturing, the preparation method includes the following steps: First step: First, vacuum dehydrate the dried oligomeric diol under negative pressure at 100 - 130 °C, then cool the dehydrated diol to 40 - 60 °C, and then add diisocyanate under nitrogen protection and stir for reaction. When the reaction temperature rises to 65 - 90 °C, continue to stir for reaction for 2 - 3 h to obtain a polyurethane prepolymer, that is, Material I. The content of -NCO in this Material I is 19% - 30%, and during the entire stirring reaction process, the external environmental temperature is maintained at 40 - 60 °C; Step 2: First, mix the chain extender, diol, catalyst, water, and heat-conducting fluid and stir evenly to obtain Material P. Then, add the above-mentioned Material I to Material P and start stirring to obtain a mixed system. The mass ratio of Material P to Material I is 100:70 - 90, and the R value is controlled at 0.98 - 1.05. Then, during the stirring process, when the volume of the mixed system starts to expand, immediately pour the mixed system into a mold, and then cure and form it at an external environmental temperature of 40 - 50°C to obtain a polyurethane material.

[0024] In the second step, if the content of each component in Material P is in parts by mass, the chain extender is 5 - 15 parts, the diol is 85 - 95 parts, the catalyst and water together are 0.5 - 2 parts, and the rest is the heat-conducting fluid. Moreover, the mass of the heat-conducting fluid is 1% - 50% of the mass of the polyurethane material.

[0025] In the first step, if the content of each component in Material I is in parts by mass, the diol is 60 - 40 parts, and the diisocyanate is 40 - 60 parts.

[0026] In the first step, the conditions for vacuum dehydration under negative pressure are: the negative pressure is 0.098 - 0.18 MPa, and the dehydration time is 2 - 3 h.

[0027] In the first step, the reaction time for adding diisocyanate and stirring for reaction is 0.5 - 1.5 h.

[0028] In the second step, the preparation process of the heat-conducting fluid includes the following steps: Step A: Disperse the heat-conducting nano-fillers in water to obtain a dispersion liquid, and the mass percentage concentration of this dispersion liquid is 1% - 30%. At the same time, dissolve DC5700 in methanol to obtain a methanol solution, and the mass percentage concentration of this methanol solution is 10% - 40%. Step B: First, gradually add the methanol solution dropwise to the dispersion liquid. The mass of DC5700 is 0.1% - 20% of the mass of the heat-conducting nano-fillers. Then, stir and react until precipitates appear and no longer increase. Then, wash the precipitates, and then dry them at 40 - 80°C to obtain an intermediate product of the heat-conducting filler. Step C: First, dissolve the above-mentioned intermediate product of the heat-conducting filler and NPES in chloroform together. The molar ratio of DC5700 to NPES is 1:1 - 1:3. Then, react for 3 - 24 h. Then, extract with deionized water several times to remove the excess NPES, and it shows upper and lower layers of water and organic solvent. Then, pour off the upper layer of water. Then, dry the lower layer of organic solvent at 40 - 80°C to obtain the heat-conducting fluid.

[0029] The thermal conductive filler is any one or any mixture of alumina, magnesia, zinc oxide, boron nitride, carbon nanotubes, and graphene. Among them, before using boron nitride, carbon nanotubes, and graphene, acidification or treatment with sodium hydroxide is required to make their surfaces rich in hydroxyl groups.

[0030] In the first step, the diol is any one or any mixture of polypropylene glycol, polytetrahydrofuran ether glycol, polyethylene glycol, polyethylene adipate, polybutylene adipate, and polycarbonate diol.

[0031] In the first step, the diisocyanate is any one or any mixture of diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, p-phenylene diisocyanate, naphthalene diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate.

[0032] A polyurethane material, which is the final product prepared by the above-mentioned preparation method of the polyurethane material for tire manufacturing. The supplementary technical features of the present invention are as follows: The oligomeric diol in the present invention refers to a diol with a molecular weight between 400 and 3000.

[0033] —NCO in the present invention refers to the isocyanate group, DC5700 refers to dimethyloctadecyltrimethoxysilane chloride, and NPES refers to sodium nonylphenol polyoxyethylene ether sulfonate.

[0034] The diol in the present invention is any one or any mixture of polypropylene glycol (PPG), polytetrahydrofuran ether glycol (PTMEG), polyethylene glycol (PEG), polyethylene adipate (PEA), polybutylene adipate (PBA), and polycarbonate diol (PCDL).

[0035] The diisocyanate in the present invention is any one or any mixture of diphenylmethane diisocyanate (MDI), dimethylbiphenyl diisocyanate (TODI), p-phenylene diisocyanate (PPDI), naphthalene diisocyanate (NDI), toluene diisocyanate (TDI), and hexamethylene diisocyanate (HDI). In the second step of the present invention, water molecules will also react with the diisocyanate, and at the same time generate carbon dioxide, forming a microporous structure inside the polyurethane material, and a microporous polyurethane material is prepared.

[0036] The reason for the present invention to limit the vacuum dehydration of the diol under negative pressure is that there is a strong hydrogen bond interaction between the diol and water molecules, and the dehydration is more complete under negative pressure.

[0037] The reason why the diol in the present invention must be cooled to 40 - 60 °C before adding the diisocyanate is as follows: From the perspective of the physical properties of raw materials, when the reaction temperature is lower than 40 °C, the diol is in a crystalline state and cannot react with the diisocyanate. At the same time, when the temperature is lower than 40 °C, the reaction heat of the system is insufficient and the reaction is difficult to proceed. In addition, if the temperature is higher than 60 °C, the reaction heat is too large, resulting in an overly violent initial reaction.

[0038] In the present invention, after the reaction temperature rises to 65 - 90 °C, continue stirring and reacting for 2 - 3 h... And during the entire stirring reaction process, maintaining the external environmental temperature at 40 - 60 °C means that: the environmental temperature provided by the external heating device is always 40 - 60 °C. At the same time, a large amount of heat is released during the reaction process of the diol and the diisocyanate, which will cause the temperature of the reaction system to rise to between 65 - 90 °C. At this time, after the temperature of the reaction system rises to 65 - 90 °C, start timing and reacting for 2 - 3 h to complete this step of the reaction.

[0039] Example 1: See Figure 1 — Figure 2 A preparation method of a polyurethane material for tire manufacturing, the preparation method comprising the following steps: The first step: First, vacuum dehydrate the dried oligomeric diol under negative pressure at 100 - 130 °C, then cool the dehydrated diol to 40 - 60 °C, and then add the diisocyanate under nitrogen protection for stirring reaction. After the reaction temperature rises to 65 - 90 °C, continue stirring and reacting for 2 - 3 h to obtain a polyurethane prepolymer, that is, I material. The content of -NCO in this I material is 19% - 30%, and during the entire stirring reaction process, the external environmental temperature is maintained at 40 - 60 °C; The second step: First, mix the chain extender, diol, catalyst, water, and heat-conducting fluid and stir evenly to obtain P material (preferably the stirring time is 1 - 10 min), then add the above I material to the P material and start stirring to obtain a mixed system. The mass ratio of P material to I material is 100:70 - 90, and the R value is controlled at 0.98 - 1.05. Then, during the stirring process (preferably rapid stirring for 5 s - 1 min), when the volume of the mixed system starts to expand, immediately pour the mixed system into a mold, and then cure and form at an external environmental temperature of 40 - 50 °C to obtain a polyurethane material.

[0040] Example 2: The basic content is the same as that of Example 1, the difference is that: In the first step, the oligomeric diol is fully dried in a vacuum drying oven and then placed into a three-necked flask equipped with a stirrer, a vacuum system, and a thermometer. Then, under the conditions of a temperature set at 100 - 130°C and a negative pressure of 0.098 - 0.18 MPa, vacuum dehydration is carried out for 2 - 3 h. After that, the flask and the vacuum pump are removed. Then, the dehydrated diol is cooled to 40 - 60°C, and then diisocyanate is added for stirring reaction. In addition, after the polyurethane prepolymer is prepared, it needs to be taken out and sealed for future use.

[0041] Example 3: The basic content is the same as that of Example 1, except that: In the first step, if the contents of each component in the I material are in parts by mass, then the diol is 60 - 40 parts, and the diisocyanate is 40 - 60 parts.

[0042] Example 4: The basic content is the same as that of Example 1, except that: In the second step, if the contents of each component in the P material are in parts by mass, then the chain extender is 5 - 15 parts, the diol is 85 - 95 parts, the catalyst and water together are 0.5 - 2 parts, and the rest is a heat-conducting fluid, and the mass of the heat-conducting fluid is 1% - 50% of the mass of the polyurethane material.

[0043] Example 5: The basic content is the same as that of Example 1, except that: In the second step, the preparation process of the heat-conducting fluid includes the following steps: Step A: The heat-conducting nano-filler is dispersed in water to obtain a dispersion liquid, and the mass percentage concentration of this dispersion liquid is 1% - 30%. At the same time, DC5700 is dissolved in methanol to obtain a methanol solution, and the mass percentage concentration of this methanol solution is 10% - 40%. Step B: First, the methanol solution is added dropwise to the dispersion liquid, and the mass of DC5700 is 0.1% - 20% of the mass of the heat-conducting nano-filler. Then, stirring reaction is carried out until the precipitate appears and no longer increases. Then, the precipitate is washed (preferably washed with water and ethanol three times respectively), and then dried under the condition of 40 - 80°C to obtain an intermediate product of the heat-conducting filler. Step C: First, the above-mentioned intermediate product of the heat-conducting filler and NPES are dissolved in chloroform together, and the molar ratio of DC5700 to NPES is 1:1 - 1:3. Then, reaction is carried out for 3 - 24 h. Then, it is extracted with deionized water several times to remove the excess NPES, and it shows upper and lower layers of water and organic solvent. Then, the upper layer of water is poured out, and then the lower layer of organic solvent is dried under the condition of 40 - 80°C to obtain the heat-conducting fluid.

[0044] Example 6: The basic content is the same as that of Example 5, with the difference that: The statement that the stirring reaction is continued until the precipitate appears and no longer increases means: after 24 hours of stirring reaction.

[0045] The drying temperature of 40 - 80°C is preferably 60°C.

[0046] The time for the further reaction of 3 - 24 hours is preferably 5 hours.

[0047] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those of ordinary skill in the art according to the disclosed content of the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for preparing a polyurethane material for tire manufacturing, characterized in that: The preparation method comprises the following steps: The first step: firstly, the dried oligomer diol is vacuum dehydrated under negative pressure at 100-130°C, then the dehydrated diol is cooled to 40-60°C, and then diisocyanate is added under nitrogen protection to carry out stirring reaction. When the reaction temperature rises to 65-90°C, the stirring reaction is continued for 2-3 hours to obtain a polyurethane prepolymer, i.e., material I. The content of -NCO in the material I is 19%-30%, and during the whole stirring reaction process, the external environment temperature is maintained at 40-60°C; Step 2: First, mix the chain extender, diol, catalyst, water and heat-conducting fluid and stir them evenly to obtain P material, then add the above-mentioned I material to the P material and start stirring to obtain a mixed system. The mass ratio of P material to I material is 100:70-90, and the R value is controlled at 0.98-1.

05. Then, during the stirring process, when the volume of the mixed system begins to expand, immediately pour the mixed system into a mold, and then cure it at an external ambient temperature of 40-50°C to obtain a polyurethane material.

2. The method for preparing a polyurethane material for tire manufacturing according to claim 1, characterized in that: In the second step, the content of each component in the P material is calculated by weight, that is, the chain extender is 5-15 parts, the diol is 85-95 parts, the catalyst and water are 0.5-2 parts in total, and the rest is heat-conducting fluid, and the mass of the heat-conducting fluid is 1%-50% of the mass of the polyurethane material.

3. The method for preparing a polyurethane material for tire manufacturing according to claim 2, characterized in that: In the first step, the contents of the components in the material I are calculated in parts by mass, that is, the diol is 60-40 parts, and the diisocyanate is 40-60 parts.

4. A method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3, characterized in that: In the first step, the conditions for vacuum dehydration under negative pressure are: negative pressure of 0.098-0.18 MPa, and dehydration time of 2-3 hours.

5. A method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3, characterized in that: In the first step, the reaction time of adding diisocyanate and stirring the reaction is 0.5-1.5h.

6. A method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3, characterized in that: In the second step, the preparation process of the heat-conducting fluid includes the following steps: Step A: dispersing the thermally conductive nanofiller in water to obtain a dispersion liquid, wherein the mass percentage concentration of the dispersion liquid is 1%-30%, and at the same time, dissolving DC5700 in methanol to obtain a methanol solution, wherein the mass percentage concentration of the methanol solution is 10%-40%; Step B: first, adding methanol solution dropwise into the dispersion, the mass of DC5700 being 0.1%-20% of the mass of the thermally conductive nanofiller, and then stirring the reaction until a precipitate appears and no longer increases, then washing the precipitate, and then drying at 40-80° C. to obtain an intermediate product of the thermally conductive filler; Step C: First, the intermediate product of the above-mentioned thermal conductive filler is dissolved in chloroform together with NPES, the molar ratio of DC5700 to NPES is 1:1-1:3, and then reacted for 3-24 hours, and then extracted with deionized water several times to remove excess NPES, and present as upper and lower layers of water and organic solvent, and then the upper layer of water is poured off, and then the lower layer of organic solvent is dried at 40-80°C to obtain a thermal conductive fluid.

7. The method for preparing a polyurethane material for tire manufacturing according to claim 6, characterized in that: The thermal conductive filler is any one of aluminum oxide, magnesium oxide, zinc oxide, boron nitride, carbon nanotubes, and graphene, or any mixture thereof. Before using boron nitride, carbon nanotubes, and graphene, they need to be acidified or treated with sodium hydroxide to enrich their surfaces with hydroxyl groups.

8. A method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3, characterized in that: In the first step, the diol is any one of polyoxypropylene glycol, polytetramethylene glycol, polyethylene oxide glycol, polyethylene adipate, polybutylene adipate, and polycarbonate diol, or any mixture thereof.

9. A method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3, characterized in that: In the first step, the diisocyanate is any one of diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, p-phenylene diisocyanate, naphthalene diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate, or any mixture thereof.

10. A polyurethane material, characterized in that: The polyurethane material is the final product prepared by the method for preparing a polyurethane material for tire manufacturing according to claim 1, 2 or 3.

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