Polyurethane elastomer material and its preparation method

Abstract

The present invention discloses a polyurethane elastomer material and a preparation method thereof, belonging to the technical field of polyurethane materials, and comprising the following steps: vacuum dehydrating polytetrahydrofuran ether at 100 °C for 2 h, cooling it to 75 - 80 °C under nitrogen protection, adding isophorone diisocyanate solution, then adding dibutyltin dilaurate, keeping warm and stirring for reaction for 3 - 5 h, dropwise adding a mixed solution of a modified chain extender and modified graphitic carbon nitride and continuing the reaction for 4 h while keeping warm, then pouring it into the mold of a flat vulcanizer, heating at 80 - 100 °C for 24 h, and then drying it under vacuum at 80 °C for 24 h to obtain the polyurethane elastomer material; through the multiple synergistic effects of the modified chain extender and modified graphitic carbon nitride, the prepared polyurethane elastomer material not only has excellent mechanical properties and thermal stability, but also has excellent self-healing effect, and can meet the performance requirements under special working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane materials, and particularly relates to a polyurethane elastomer material and a preparation method thereof. Background Art

[0002] Polyurethane elastomer is copolymerized from diisocyanate and polyol. Because of its excellent properties such as high wear resistance, high strength, high elasticity, and high flexibility, it is widely used in the field of engineering materials. However, with the increasing requirements for the performance of polymer materials, the existing polyurethane elastomers are difficult to meet the usage requirements in special working environments. For example, under high-intensity impacts, cracks and damages will occur inside them. At the same time, due to the large difference in the thermodynamic properties of the hard and soft segments, a special microphase separation structure is formed, which increases the inter-chain friction during molecular movement. When subjected to vibration deformation, the vibration kinetic energy can be converted into heat energy. If the generated heat is too high and cannot be dissipated in time, the molecular chains will break, causing damage to the internal structure and leading to a decrease in the service life of the polyurethane elastomer. The application of polyurethane elastomers in high-temperature or high-load fields is restricted. Therefore, it is necessary to modify the existing polyurethane elastomers so that the modified polyurethane elastomers can meet the performance requirements in special working environments.

[0003] In the prior art, in order to improve the mechanical strength and heat resistance of polyurethane elastomers, graphene is often used as a nano-filler to modify polyurethane elastomers. However, the compatibility between graphene and polyurethane elastomers is poor, it is not easy to disperse in the polyurethane matrix, and it is easy to agglomerate, resulting in limited improvement in the performance of polyurethane elastomers. How to prepare a polyurethane elastomer material with high strength, good heat dissipation and crack self-repair ability is a technical problem that needs to be solved currently. Summary of the Invention

[0004] The purpose of the present invention is to provide a polyurethane elastomer material and a preparation method thereof to solve the problems in the background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A preparation method of a polyurethane elastomer material, comprising the following steps:

[0007] Poly(tetrahydrofuran) ether is dehydrated under vacuum at 100°C for 2 h, cooled to 75 - 80°C under nitrogen protection, then an isophorone diisocyanate solution is added, and dibutyltin dilaurate is added. It is kept warm and stirred for reaction for 3 - 5 h, a mixed solution of a modified chain extender and modified graphitic carbon nitride is added dropwise and the reaction is continued while keeping warm for 4 h, then it is poured into the mold of a flat vulcanizer, heated at 80 - 100°C for 24 h, and then vacuum dried at 80°C for 24 h to obtain the polyurethane elastomer material.

[0008] Further, the dosage ratio of the polytetrahydrofuran ether, isophorone diisocyanate solution, dibutyltin dilaurate, and the mixed solution of the modified chain extender and modified graphitic carbon nitride is 10 g: 5 - 6 mL: 0.01 - 0.02 g: 50 mL; the isophorone diisocyanate solution is composed of isophorone diisocyanate and N,N-dimethylformamide mixed in a dosage ratio of 3 - 4 g: 5 mL.

[0009] Further, the mixed solution of the modified chain extender and modified graphitic carbon nitride is composed of the modified chain extender, modified graphitic carbon nitride, and N,N-dimethylformamide mixed in a dosage ratio of 3 - 4 g: 0.02 - 0.03 g: 50 mL.

[0010] Further, the modified chain extender is prepared by the following steps:

[0011] Cystamine dihydrochloride is added to the organic mixed solution and stirred until dissolved, then ethyl acrylate and triethylamine are added, and the mixture is stirred and reacted at 35°C for 12 h, then washed with deionized water and vacuum dried at 50°C for 24 h to obtain a modified chain extender containing disulfide bonds. Under the condition of triethylamine as a catalyst, the amino group in cystamine dihydrochloride reacts with the double bond in ethyl acrylate to obtain a modified chain extender with a symmetric structure centered on disulfide bonds.

[0012] Further, the dosage ratio of the cystamine dihydrochloride, organic mixed solution, ethyl acrylate, and triethylamine is 5 - 5.5 g: 30 - 50 mL: 4.5 g: 4.5 g; the organic mixed solution is composed of anhydrous ethanol and tetrahydrofuran mixed in a volume ratio of 1:1.

[0013] Further, the modified graphitic carbon nitride is prepared by the following steps:

[0014] Step S1: Graphitic carbon nitride is added to the ammonia water solution and ultrasonically mixed for 30 min, then hydrothermal reaction is carried out at a temperature of 160 - 180°C for 2 - 4 h. After cooling to room temperature, the precipitate is centrifuged and separated, and the precipitate is washed with water and ethanol, and then dried in an oven at 60°C for 12 h to obtain hydroxy-functionalized graphitic carbon nitride; through the hydrothermal reaction, rich hydroxyl functional groups are loaded on the surface of graphitic carbon nitride, providing conditions for subsequent grafting modification.

[0015] Step S2: Ultrasonically disperse hydroxy-functionalized graphitic carbon nitride in deionized water, then add a copper nitrate solution dropwise, stir and react for 12 h under dark conditions, then centrifuge to separate the precipitate, wash the precipitate with water and ethanol, then vacuum dry at 25 °C for 12 h, and then place it in a magnetic boat in a tubular furnace, and keep it at 300 °C under nitrogen protection for 2 - 4 h to obtain copper-containing graphitic carbon nitride; the copper single atoms in the copper-containing graphitic carbon nitride are coordinated with nitrogen atoms, so that copper atoms are uniformly loaded in the graphitic carbon nitride. On the one hand, it can increase the thermal conductivity, and on the other hand, it can introduce coordination bonds into the polyurethane elastomer material.

[0016] Step S3: Add the copper-containing graphitic carbon nitride to N,N-dimethylformamide and ultrasonically disperse for 2 h, then add 4,4'-diphenylmethane diisocyanate, and then add dibutyltin dilaurate dropwise, stir and react at 55 °C for 8 h, after filtration, wash with N,N-dimethylformamide, and dry in a vacuum drying oven at 50 °C for 4 h to obtain modified graphitic carbon nitride.

[0017] Further, the dosage ratio of the graphitic carbon nitride to the ammonia water solution is 0.6 - 0.8 g:50 mL; the mass fraction of the ammonia water solution is 4%.

[0018] Further, the dosage ratio of the hydroxy-functionalized graphitic carbon nitride, deionized water and the copper nitrate solution is 5 g:50 mL:20 - 30 mL; the concentration of the copper nitrate solution is 25 - 30 mg / mL.

[0019] Further, the dosage ratio of the copper-containing graphitic carbon nitride, N,N-dimethylformamide, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate is 0.2 - 0.3 g:50 mL:8 g:0.1 - 0.2 mL; the dibutyltin dilaurate is used as a catalyst.

[0020] A polyurethane elastomer material is prepared by the above preparation method.

[0021] The beneficial effects of the present invention:

[0022] In the present invention, inexpensive cystamine dihydrochloride and ethyl acrylate are used as raw materials to synthesize a chain extender containing imine bonds and disulfide bonds. The imine bonds can react with isocyanate groups to form ureido groups, thereby realizing the chain extension of the polyurethane prepolymer. At the same time, disulfide bonds are introduced into the polyurethane elastomer material. The disulfide bonds can be cleaved into sulfur free radicals under the external stimuli of temperature and time, and then recombined into new disulfides. Through the dynamic exchange of disulfide bonds, the recombination of chemical bonds can be realized, which can endow the polyurethane elastomer material with excellent self-healing properties;

[0023] In the present invention, a large number of hydroxyl functional groups are loaded on the surface of graphitic carbon nitride through a hydrothermal reaction, and then uniformly mixed with a copper nitrate solution. After heat preservation treatment, metal copper atoms are coordinately loaded in the hydroxyl-containing graphitic carbon nitride. Finally, 4,4'-diphenylmethane diisocyanate is chemically grafted on the surface of the copper-containing graphitic carbon nitride to obtain the modified graphitic carbon nitride of the present invention. Loading hydroxyl functional groups first not only facilitates the uniform dispersion of graphitic carbon nitride in both deionized water and organic solvents, but also provides the possibility for grafting 4,4'-diphenylmethane diisocyanate on the surface of graphitic carbon nitride. The loading of metal copper atoms can, on the one hand, increase the thermal conductivity of the modified graphitic carbon nitride, thereby improving the heat dissipation performance of the polyurethane elastomer material; on the other hand, it can also introduce coordination bonds into the polyurethane elastomer material, and cooperate with hydrogen bonds to improve the tensile strength of the material. The grafting of 4,4'-diphenylmethane diisocyanate improves the reaction activity of graphitic carbon nitride and also improves the dispersion of the modified graphitic carbon nitride in the polyurethane elastomer material.

[0024] In the present invention, isophorone diisocyanate and polytetrahydrofuran ether are used as raw materials, and a polyurethane prepolymer is obtained by reacting under the catalysis of dibutyltin dilaurate. Then, a modified chain extender and modified graphitic carbon nitride are added to the polyurethane prepolymer for further reaction to obtain a polyurethane elastomer material. The hard segment of the polyurethane elastomer contains multiple urea groups and urethane groups, which have abundant hydrogen bond donors and acceptors, and the number of hydrogen bond sites increases significantly. Moreover, a flexible ester ring group is spaced between the urea group and the urethane group, and multiple hydrogen bonds can be formed between the urea group and the urethane group to crosslink the polymer segments, thus showing excellent mechanical strength. The modified graphitic carbon nitride is grafted onto the polyurethane prepolymer through isocyanate groups. As a reinforcing body, it can not only increase the mechanical properties of the polyurethane elastomer material, but also improve the thermal stability of the polyurethane elastomer material. The coordination bonds in the modified graphitic carbon nitride can cooperate with the hydrogen bonds in the polyurethane to further improve the mechanical properties of the polyurethane elastomer material, and a polyurethane elastomer material with high strength and toughness is obtained. In addition, the high-density hydrogen bonds in the hard segment can cooperate with disulfide bonds. By heating, the dynamic fracture and formation of hydrogen bond crosslinking and the fracture and formation of disulfide bonds can be activated, so that the polyurethane elastomer material prepared in the present invention has excellent self-healing effect. Detailed implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0026] Example 1

[0027] This example provides a modified chain extender, which is prepared through the following steps:

[0028] Add 5 g of cystamine dihydrochloride to 30 mL of an organic mixed solution and stir to dissolve it. The organic mixed solution is composed of anhydrous ethanol and tetrahydrofuran mixed in a volume ratio of 1:1. Then add 4.5 g of ethyl acrylate and 4.5 g of triethylamine, stir and react at 35 °C for 12 h, then wash with deionized water, and vacuum dry at 50 °C for 24 h to obtain the modified chain extender.

[0029] Example 2

[0030] This example provides a modified chain extender, which is prepared through the following steps:

[0031] Add 5.2 g of cystamine dihydrochloride to 40 mL of an organic mixed solution and stir to dissolve it. The organic mixed solution is composed of anhydrous ethanol and tetrahydrofuran mixed in a volume ratio of 1:1. Then add 4.5 g of ethyl acrylate and 4.5 g of triethylamine, stir and react at 35 °C for 12 h, then wash with deionized water, and vacuum dry at 50 °C for 24 h to obtain the modified chain extender.

[0032] Example 3

[0033] This example provides a modified chain extender, which is prepared through the following steps:

[0034] Add 5.5 g of cystamine dihydrochloride to 50 mL of an organic mixed solution and stir to dissolve it. The organic mixed solution is composed of anhydrous ethanol and tetrahydrofuran mixed in a volume ratio of 1:1. Then add 4.5 g of ethyl acrylate and 4.5 g of triethylamine, stir and react at 35 °C for 12 h, then wash with deionized water, and vacuum dry at 50 °C for 24 h to obtain the modified chain extender.

[0035] Example 4

[0036] This example provides a modified graphite phase carbon nitride, which is prepared through the following steps:

[0037] Step S1: Add 6 g of graphite phase carbon nitride to 500 mL of an ammonia water solution with a concentration of 4 wt%, ultrasonically mix for 30 min, then carry out a hydrothermal reaction at a temperature of 160 °C for 4 h. After cooling to room temperature, centrifuge to separate the precipitate, wash the precipitate with water and ethanol, and dry it in an oven at 60 °C for 12 h to obtain hydroxyl-containing graphite phase carbon nitride;

[0038] Step S2: Ultrasonically disperse 5 g of hydroxyl-containing graphitic carbon nitride in 50 mL of deionized water, then add dropwise 20 mL of a copper nitrate solution with a concentration of 30 mg / mL, stir and react for 12 h under dark conditions, then centrifuge to separate the precipitate, wash the precipitate with water and ethanol, then vacuum dry at 25 °C for 12 h, then place it in a magnetic boat in a tubular furnace, and carry out heat preservation treatment at 300 °C under nitrogen protection for 4 h to obtain copper-containing graphitic carbon nitride;

[0039] Step S3: Add 0.2 g of copper-containing graphitic carbon nitride to 50 mL of N,N-dimethylformamide and ultrasonically disperse for 2 h, then add 8 g of 4,4'-diphenylmethane diisocyanate, and then add dropwise 0.1 mL of dibutyltin dilaurate, stir and react at 55 °C for 8 h, after filtration, wash with N,N-dimethylformamide, and dry in a vacuum drying oven at 50 °C for 4 h to obtain modified graphitic carbon nitride.

[0040] Example 5

[0041] This example provides a modified graphitic carbon nitride, which is prepared through the following steps:

[0042] Step S1: Add 7 g of graphitic carbon nitride to 500 mL of an ammonia water solution with a concentration of 4 wt%, ultrasonically mix for 30 min, then carry out hydrothermal reaction at 170 °C for 3 h, after cooling to room temperature, centrifuge to separate the precipitate, wash the precipitate with water and ethanol, and dry in an oven at 60 °C for 12 h to obtain hydroxyl-containing graphitic carbon nitride;

[0043] Step S2: Ultrasonically disperse 5 g of hydroxyl-containing graphitic carbon nitride in 50 mL of deionized water, then add dropwise 25 mL of a copper nitrate solution with a concentration of 28 mg / mL, stir and react for 12 h under dark conditions, then centrifuge to separate the precipitate, wash the precipitate with water and ethanol, then vacuum dry at 25 °C for 12 h, then place it in a magnetic boat in a tubular furnace, and carry out heat preservation treatment at 300 °C under nitrogen protection for 3 h to obtain copper-containing graphitic carbon nitride;

[0044] Step S3: Add 0.25 g of copper-containing graphitic carbon nitride to 50 mL of N,N-dimethylformamide and ultrasonically disperse for 2 h, then add 8 g of 4,4'-diphenylmethane diisocyanate, and then add dropwise 0.15 mL of dibutyltin dilaurate, stir and react at 55 °C for 8 h, after filtration, wash with N,N-dimethylformamide, and dry in a vacuum drying oven at 50 °C for 4 h to obtain modified graphitic carbon nitride.

[0045] Example 6

[0046] This example provides a modified graphitic carbon nitride, which is prepared through the following steps:

[0047] Step S1: Add 8 g of graphitic carbon nitride into 500 mL of ammonia water solution with a concentration of 4 wt%, ultrasonically mix for 30 min, then carry out a hydrothermal reaction at 180 °C for 2 h. After cooling to room temperature, centrifuge to separate the precipitate, wash the precipitate with water and ethanol, and dry it in an oven at 60 °C for 12 h to obtain hydroxyl-containing graphitic carbon nitride;

[0048] Step S2: Ultrasonically disperse 5 g of hydroxyl-containing graphitic carbon nitride in 50 mL of deionized water, then dropwise add 30 mL of copper nitrate solution with a concentration of 25 mg / mL, stir and react for 12 h under dark conditions, then centrifuge to separate the precipitate, wash the precipitate with water and ethanol, and then vacuum dry at 25 °C for 12 h. Then place it in a magnetic boat in a tube furnace, and carry out heat preservation treatment at 300 °C for 2 h under nitrogen protection to obtain copper-containing graphitic carbon nitride;

[0049] Step S3: Add 0.3 g of copper-containing graphitic carbon nitride into 50 mL of N,N-dimethylformamide, ultrasonically disperse for 2 h, then add 8 g of 4,4'-diphenylmethane diisocyanate, and then dropwise add 0.2 mL of dibutyltin dilaurate, stir and react at 55 °C for 8 h. After filtration, wash with N,N-dimethylformamide, and dry in a vacuum drying oven at 50 °C for 4 h to obtain modified graphitic carbon nitride.

[0050] Example 7

[0051] This example provides a polyurethane elastomer material, which is prepared by the following preparation method:

[0052] Vacuum dehydrate 100 g of polytetrahydrofuran ether at 100 °C for 2 h, cool to 75 °C under nitrogen protection, then add 50 mL of isophorone diisocyanate solution, where the isophorone diisocyanate solution is composed of isophorone diisocyanate and N,N-dimethylformamide mixed according to a dosage ratio of 4 g:5 mL, and then add 0.1 g of dibutyltin dilaurate, keep warm and stir and react for 5 h, dropwise add 500 mL of a mixed solution of modified chain extender and modified graphitic carbon nitride, where the mixed solution of modified chain extender and modified graphitic carbon nitride is composed of the modified chain extender prepared in Example 1, the modified graphitic carbon nitride prepared in Example 4 and N,N-dimethylformamide mixed according to a dosage ratio of 3 g:0.02 g:50 mL, continue to keep warm and react for 4 h, then pour it into the mold of a flat vulcanizer, heat at 80 °C for 24 h, and then vacuum dry at 80 °C for 24 h to obtain the polyurethane elastomer material.

[0053] Example 8

[0054] This example provides a polyurethane elastomer material, which is prepared by the following preparation method:

[0055] 100 g of polytetrahydrofuran ether was dehydrated under vacuum at 100 °C for 2 h, cooled to 80 °C under nitrogen protection, and then 55 mL of isophorone diisocyanate solution was added. The isophorone diisocyanate solution was composed of isophorone diisocyanate and N,N-dimethylformamide mixed in a dosage ratio of 3.5 g:5 mL. Then, 0.15 g of dibutyltin dilaurate was added, and the mixture was kept warm and stirred for reaction for 4 h. A mixed solution of 500 mL of modified chain extender and modified graphitic carbon nitride was added dropwise. The mixed solution of modified chain extender and modified graphitic carbon nitride was composed of the modified chain extender prepared in Example 2, the modified graphitic carbon nitride prepared in Example 5, and N,N-dimethylformamide mixed in a dosage ratio of 3.5 g:0.03 g:50 mL. The reaction was continued under warm conditions for 4 h, and then the mixture was poured into the mold of a flat vulcanizer, heated at 90 °C for 24 h, and then vacuum dried at 80 °C for 24 h to obtain a polyurethane elastomer material.

[0056] Example 9

[0057] This example provides a polyurethane elastomer material, which is prepared by the following preparation method:

[0058] 100 g of polytetrahydrofuran ether was dehydrated under vacuum at 100 °C for 2 h, cooled to 80 °C under nitrogen protection, and then 60 mL of isophorone diisocyanate solution was added. The isophorone diisocyanate solution was composed of isophorone diisocyanate and N,N-dimethylformamide mixed in a dosage ratio of 4 g:5 mL. Then, 0.2 g of dibutyltin dilaurate was added, and the mixture was kept warm and stirred for reaction for 3 h. A mixed solution of 500 mL of modified chain extender and modified graphitic carbon nitride was added dropwise. The mixed solution of modified chain extender and modified graphitic carbon nitride was composed of the modified chain extender prepared in Example 3, the modified graphitic carbon nitride prepared in Example 6, and N,N-dimethylformamide mixed in a dosage ratio of 4 g:0.03 g:50 mL. The reaction was continued under warm conditions for 4 h, and then the mixture was poured into the mold of a flat vulcanizer, heated at 100 °C for 24 h, and then vacuum dried at 80 °C for 24 h to obtain a polyurethane elastomer material.

[0059] Comparative Example 1

[0060] Compared with Example 9, the difference in this comparative example is that commercially available 4,4'-diaminodiphenyl disulfide (APDS) was used to replace the modified chain extender prepared in Example 3, and the other raw materials and steps were the same.

[0061] Comparative Example 2

[0062] Compared with Example 9, the difference in this comparative example is that commercially available graphitic carbon nitride was used to replace the modified graphitic carbon nitride prepared in Example 6, and the other raw materials and steps were the same.

[0063] Comparative Example 3

[0064] This comparative example is different from Example 9 in that the copper-containing graphitic carbon nitride prepared in step S2 of Example 6 is directly used to replace the modified graphitic carbon nitride prepared in Example 6, and the remaining raw materials and steps are the same.

[0065] Perform performance tests on the polyurethane elastomer materials prepared in Examples 7 - 9 and Comparative Examples 1 - 3. Use a tensile testing machine to test the tensile strength and elongation at break of the polyurethane elastomer material samples at a tensile rate of 200 mm / min at room temperature; use a thermogravimetric analyzer to test the thermal stability under nitrogen protection; cut the polyurethane elastomer material samples in the middle position, then closely contact the cut surfaces, and keep them in an oven at 100 °C for 36 h, and then conduct tensile tests again, recording the tensile strength and elongation at break after repair; the results are shown in Table 1:

[0066] Table 1

[0067]

[0068]

[0069] It can be seen from the data in Table 1 that the polyurethane elastomer materials prepared in Examples 7 - 9 have excellent tensile mechanical properties and thermal stability. After being cut and then thermally repaired, their mechanical properties can still recover to more than 90% of the original mechanical properties, showing excellent self-healing properties.

[0070] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0071] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a polyurethane elastomer material, characterized in that: The following steps are involved: Dehydrate polytetrahydrofuran ether under vacuum at 100°C for 2h, cool to 75-80°C under nitrogen protection, add isophorone diisocyanate solution, then add dibutyltin dilaurate, keep warm and stir for 3-5h, dropwise add a mixed solution of modified chain extender and modified graphite phase carbon nitride, continue to keep warm and react for 4h, then pour into a mold of a flat vulcanizer, heat at 80-100°C for 24h, and then vacuum dry at 80°C for 24h to obtain a polyurethane elastomer material; The modified chain extender is prepared by the following steps: Cystamine dihydrochloride was added to the organic mixed solution and stirred to dissolve, and then ethyl acrylate and triethylamine were added, and the mixture was stirred and reacted at 35° C. for 12 h, and then washed with deionized water, and vacuum dried at 50° C. for 24 h to obtain a modified chain extender; The modified graphite phase carbon nitride is prepared by the following steps: Step S1, adding graphite phase carbon nitride to an ammonia solution and ultrasonically mixing for 30 minutes, performing a hydrothermal reaction at a temperature of 160-180° C. for 2-4 hours, cooling to room temperature, centrifuging and separating the precipitate, washing the precipitate with water and ethanol, and drying to obtain hydroxyl-containing graphite phase carbon nitride; Step S2, ultrasonically dispersing the hydroxyl-containing graphite phase carbon nitride in deionized water, then dropping a copper nitrate solution, stirring and reacting for 12 hours in the dark, then centrifuging and separating the precipitate, washing the precipitate with water and ethanol, vacuum drying, and then placing it in a magnetic boat in a tubular furnace, and heat-treating it at 300° C. for 2-4 hours under nitrogen protection to obtain copper-containing graphite phase carbon nitride; Step S3, adding copper-containing graphite phase carbon nitride to N,N-dimethylformamide and ultrasonically dispersing for 2 hours, then adding 4,4'-diphenylmethane diisocyanate, and then dropping dibutyltin dilaurate, stirring and reacting at 55°C for 8 hours, filtering, washing, and vacuum drying to obtain modified graphite phase carbon nitride.

2. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The dosage ratio of the mixed solution of polytetrahydrofuran ether, isophorone diisocyanate solution, dibutyltin dilaurate, modified chain extender and modified graphite phase carbon nitride is 10g:5-6mL:0.01-0.02g:50mL; the isophorone diisocyanate solution is composed of isophorone diisocyanate and N,N-dimethylformamide mixed in a dosage ratio of 3-4g:5mL.

3. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The mixed solution of the modified chain extender and modified graphite phase carbon nitride is composed of the modified chain extender, modified graphite phase carbon nitride and N,N-dimethylformamide in a dosage ratio of 3-4g: 0.02-0.03g: 50mL.

4. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The dosage ratio of cystamine dihydrochloride, organic mixed solution, ethyl acrylate and triethylamine is 5-5.5g:30-50mL:4.5g:4.5g; the organic mixed solution is composed of anhydrous ethanol and tetrahydrofuran mixed in a volume ratio of 1:

1.

5. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The usage ratio of the graphite phase carbon nitride to the ammonia solution is 0.6-0.8 g:50 mL; the mass fraction of the ammonia solution is 4%.

6. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The usage ratio of the hydroxyl-containing graphite phase carbon nitride, deionized water and copper nitrate solution is 5g:50mL:20-30mL; the concentration of the copper nitrate solution is 25-30mg / mL.

7. The method for preparing the polyurethane elastomer material according to claim 1, characterized in that: The usage ratio of the copper-containing graphite phase carbon nitride, N,N-dimethylformamide, 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate is 0.2-0.3 g: 50 mL: 8 g: 0.1-0.2 mL.

8. Polyurethane elastomer material, characterized in that: Prepared by the preparation method according to any one of claims 1 to 7.

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