A kind of graphene plastic and preparation method thereof

Abstract

The present application discloses a kind of graphene plastic and its preparation method, relates to the field of plastic technology, including the following components by weight: 100-120 parts of thermoplastic elastomer, 30-60 parts of polymer resin, 0.1-0.5 parts of modified graphene, 0.1-0.4 parts of filler; wherein, the modified graphene is isocyanate-based graphene, and the preparation of the isocyanate-based graphene includes the following steps: step 1, graphene oxide is introduced into N, N-dimethylformamide, and ultrasonic water bath treatment is 0.5-3h to obtain graphene glue; step 2, toluene solution of 1,6-hexane diisocyanate is added dropwise to the graphene glue, and a catalyst is reacted, and the reaction temperature is controlled to be 80-85°C, and the reaction time is 4-6h to obtain a reactant; step 3, isocyanate-based graphene is obtained after the reactant is washed in toluene. The present application has the effect of improving graphene dispersion performance, improving graphene plastic strength and wear resistance.

Description

Technical Field

[0001] The present application relates to the field of plastic technology, and in particular to a graphene plastic and a preparation method thereof. Background Art

[0002] With the development of productivity and the improvement of people's living standards, people have more and more leisure time. Sports are one of their favorite activities in their spare time. Therefore, scientific and humanized sports facilities are directly related to the personal safety of athletes. Plastic running tracks can be used in various gymnasiums, track and field stadiums and other indoor and outdoor venues.

[0003] Graphene plastic, as the basic core material of PGE graphene plastic track, has gradually replaced EPDM material as the traditional plastic material due to its advantages of environmental protection, non-toxicity, high weather resistance, wear resistance and strong anti-aging performance.

[0004] A Chinese patent application document with publication number CN110481113A discloses an environmentally friendly plastic runway and a method for preparing the same. The environmentally friendly plastic runway is provided with a plastic runway surface layer, a plastic runway adhesive layer, a plastic runway buffer layer, a plastic runway stabilization layer and a plastic runway bottom layer from top to bottom. The upper surface of the plastic runway buffer layer is coated with a plastic runway adhesive layer, and the plastic runway surface layer is bonded to the plastic runway adhesive layer.

[0005] The components of the plastic track surface layer are, based on weight parts, 40-50 parts of waste plastic raw materials, 20-35 parts of polyether polyols, 10-15 parts of fillers, 0.5-1 parts of graphene, 10-15 parts of polyisocyanates, 8-17 parts of stearic acid, 10-30 parts of soybean polyols, 10-20 parts of attapulgite clay, 1-2 parts of curing agents, 15-28 parts of environmentally friendly plasticizers, 1-2 parts of catalysts, 0.5-1 parts of antioxidants, 0.5-1 parts of flame retardants and 1-2 parts of pigments.

[0006] The composition of the environmentally friendly plastic track surface is complex, and there are certain organic volatiles. In addition, since the components are mainly strengthened by 0.5 to 1 parts of graphene during mutual mixing, it is difficult to evenly disperse the graphene with hexamembered rings as the basic structural unit in the composition of the plastic track surface by directly adding graphene, and thus it is difficult to achieve the strength and wear resistance requirements of the plastic track, which needs to be improved. Summary of the invention

[0007] In view of this, the purpose of this application is to provide a graphene plastic and a preparation method thereof, so as to achieve the purpose of significantly improving strength and wear resistance. The specific scheme is as follows:

[0008] A graphene plastic comprises the following components in parts by weight:

[0009] 100-120 parts of thermoplastic elastomer, 30-60 parts of polymer resin, 0.15-0.5 parts of modified graphene, 0.1-0.4 parts of filler;

[0010] Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of the isocyanate-modified graphene comprises the following steps:

[0011] Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 0.5-3h to obtain a graphene glue;

[0012] Step 2, dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and a catalyst into the graphene glue to react, controlling the reaction temperature to 80-85° C. and the reaction time to 4-6 hours to obtain a reactant;

[0013] Step 3: Wash the reactant in toluene to obtain isocyanate-modified graphene.

[0014] Preferably, the polymer resin is at least one of a copolymer of ethylene and propylene, butene, hexene or octene, and contains at least one of a hydroxyl group, a thiol group, a carboxyl group or a sulfonic acid group as an active group.

[0015] Preferably, the mass percentage of the active groups in the polymer resin is 1.3-5.8wt%, and the ethylene content is greater than 50wt%.

[0016] Preferably, the thermoplastic elastomer is a linear hydroxyl-terminated polyurethane, which is AS-737L purchased from BASF.

[0017] Preferably: the concentration of graphene in the graphene glue is 3 mg / ml; the concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4 g / ml, and the mass ratio of graphene in the graphene glue to 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 3-4:18.

[0018] Preferably, the filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%.

[0019] Preferably: the catalyst is triethylenediamine or stannous octoate.

[0020] Preferably, the invention also comprises 0.01-0.2 parts by weight of butylene carboxylic acid.

[0021] The second object of the present application is to provide a method for preparing graphene plastic, which is used to prepare the graphene plastic as described above, comprising the following steps:

[0022] Step 1, stirring and mixing the thermoplastic elastomer and the polymer resin, and slowly heating to 50° C. to obtain a combined blank;

[0023] Step 2: Add the modified graphene and the filler to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer;

[0024] Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

[0025] It can be seen from the above scheme that the present application provides a graphene plastic and a preparation method thereof, and the graphene plastic and the preparation method thereof have the following beneficial effects:

[0026] 1. Graphene plastic is prepared by using thermoplastic elastomer, polymer resin, modified graphene and filler as components. On the one hand, the amount of graphene added is controlled to effectively control the cost. On the other hand, the graphene is grafted and modified so that the -NCO at one end of the modified graphene is in an unreacted state during the grafting reaction with 1,6-hexamethylene diisocyanate, thereby having the effect of being effectively dispersed in the thermoplastic elastomer and polymer resin while avoiding the reduction in the strength of the graphene plastic due to the reduction in the amount of graphene;

[0027] 2. Through the grafting modification reaction treatment of graphene, the agglomeration of graphene after addition is avoided, so as to give full play to the physical and chemical properties of modified graphene, effectively enhance the strength of graphene plastic, and achieve the purpose of shielding corrosion to significantly reduce the risk of corrosion;

[0028] 3. The modified graphene prepared by the preparation steps of the present application has the function of avoiding the synchronous reaction of the isocyanate groups at both ends of 1,6-hexamethylene diisocyanate, while reducing the amount of hydrophilic groups such as hydroxyl groups on the surface of graphene oxide, and is used to improve the surface hydrophobicity of graphene plastic, thereby achieving the purpose of significantly improving the strength and wear resistance of graphene plastic. DETAILED DESCRIPTION

[0029] The following will be clearly and completely described in conjunction with the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be mentioned that the N,N-dimethylformamide, 1,6-hexamethylene diisocyanate, toluene, fillers and catalysts used in the examples of the present application are all commercially available and will not be described in detail here.

[0031] The following is a detailed description of a graphene plastic and a preparation method thereof according to the present application.

[0032] A graphene plastic comprises the following components in parts by weight:

[0033] 100-120 parts of thermoplastic elastomer, 30-60 parts of polymer resin, 0.15-0.5 parts of modified graphene, 0.1-0.4 parts of filler;

[0034] Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of isocyanate-modified graphene comprises the following steps:

[0035] Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 0.5-3h to obtain a graphene glue;

[0036] Step 2, dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and a catalyst into the graphene glue to react, controlling the reaction temperature to 80-85° C. and the reaction time to 4-6 hours to obtain a reactant;

[0037] Step 3: Wash the reactant in toluene to obtain isocyanate-modified graphene.

[0038] It should be noted that the polymer resin in the embodiment of the present application is at least one of a copolymer of ethylene and propylene, butene, hexene or octene, and contains at least one of a hydroxyl group, a thiol group, a carboxyl group or a sulfonic acid group as an active group. The mass percentage of the active group in the polymer resin is 1.3-5.8wt%, and the content of ethylene is greater than 50wt%.

[0039] The thermoplastic elastomer is a linear hydroxyl-terminated polyurethane, which is AS-737L purchased from BASF. Of course, it can also be other commercially available linear hydroxyl-terminated polyurethanes or polyurethane ends are terminated with linear hydroxyl monomers, which will not be described in detail here.

[0040] It should be mentioned that in the preparation step of isocyanate-based graphene in the present embodiment, the concentration of graphene in the graphene glue is controlled to be 3mg / ml; the concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4g / ml, and the mass ratio of graphene in the graphene glue to 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 3-4:18. The filler is a mixture of calcium carbonate or calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silica and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%. The catalyst is triethylenediamine or stannous octoate. Of course, the catalyst can also be a commercially available organotin catalyst, which will not be repeated here.

[0041] In order to further improve the dispersion performance of graphene in various components of the graphene plastic, the graphene plastic also includes 0.01-0.2 parts by weight of butylene formate.

[0042] A method for preparing graphene plastic, used for preparing the graphene plastic as described above, comprises the following steps:

[0043] Step 1, stirring and mixing the thermoplastic elastomer and the polymer resin, and slowly heating to 50° C. to obtain a combined blank;

[0044] Step 2: Add the modified graphene and the filler to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer;

[0045] Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

[0046] Embodiment 1

[0047] A graphene plastic comprises 100 parts by weight of AS-737L, 30 parts by weight of polymer resin, 0.15 parts by weight of modified graphene, and 0.1 parts by weight of calcium carbonate.

[0048] Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of isocyanate-modified graphene comprises the following steps:

[0049] Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 0.5 h to obtain a graphene glue;

[0050] Step 2: dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and triethylenediamine or stannous octoate into the graphene glue to react, controlling the reaction temperature to 80° C. and the reaction time to 4 h to obtain a reactant;

[0051] Step 3: Wash the reactant in toluene to obtain isocyanate-modified graphene.

[0052] It should be noted that in Example 1 of the present application, the polymer resin is a copolymer of ethylene and butene, and contains mercapto groups as active groups. The mass percentage of the active groups in the polymer resin is 2.2wt%, and the ethylene content is controlled to be 58wt%.

[0053] The thermoplastic elastomer is a linear hydroxyl-terminated polyurethane, and the linear hydroxyl-terminated polyurethane is AS-737L purchased from BASF.

[0054] It should be mentioned that in the preparation step of isocyanate-based graphene in Example 1 of the present application, the concentration of graphene in the graphene glue is controlled to be 3 mg / ml. The concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4 g / ml, and in the process of adding the toluene solution of 1,6-hexamethylene diisocyanate to the graphene glue, the amount of the toluene solution of 1,6-hexamethylene diisocyanate is controlled to be 1:6 based on the mass ratio of graphene to 1,6-hexamethylene diisocyanate.

[0055] A method for preparing a graphene plastic is provided, which is used to prepare the graphene plastic as described above, and comprises the following steps:

[0056] Step 1, mixing AS-737L and polymer resin, slowly heating to 50° C. to obtain a composite blank;

[0057] Step 2: Add modified graphene and calcium carbonate to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer;

[0058] Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

[0059] Embodiment 2

[0060] A graphene plastic comprises 110 parts by weight of AS-737L, 40 parts by weight of polymer resin, 0.3 parts by weight of modified graphene, and 0.2 parts by weight of filler.

[0061] Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of isocyanate-modified graphene comprises the following steps:

[0062] Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 1 h to obtain a graphene gel;

[0063] Step 2, dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and triethylenediamine or stannous octoate into the graphene glue to react, controlling the reaction temperature to 81° C. and the reaction time to 5 h to obtain a reactant;

[0064] Step 3: Wash the reactant in toluene to obtain isocyanate-modified graphene.

[0065] It should be noted that in Example 2 of the present application, the polymer resin is an ethylene-propylene copolymer and an ethylene-octene copolymer, and contains carboxyl and sulfonic acid groups as active groups. The mass percentage of the active groups in the polymer resin is 4.3wt%, and the ethylene content is greater than 50wt%.

[0066] It should be mentioned that in the preparation step of isocyanate-based graphene in Example 2 of the present application, the concentration of graphene in the graphene glue is controlled to be 3 mg / ml. The concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4 g / ml, and in the process of dripping the toluene solution of 1,6-hexamethylene diisocyanate into the graphene glue, the amount of the toluene solution of 1,6-hexamethylene diisocyanate is controlled to be added according to the mass ratio of graphene to 1,6-hexamethylene diisocyanate of 2:9. At the same time, the filler is a mixture of calcium carbonate and polytetrafluoroethylene powder, and the mass percentage of calcium carbonate in the filler is 98%.

[0067] A method for preparing graphene plastic, used for preparing the graphene plastic as described above, comprises the following steps:

[0068] Step 1, mixing AS-737L and polymer resin, slowly heating to 50° C. to obtain a composite blank;

[0069] Step 2: Add the modified graphene and the filler to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer;

[0070] Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

[0071] Embodiment 3

[0072] A graphene plastic comprises 120 parts by weight of AS-737L, 60 parts by weight of polymer resin, 0.5 parts by weight of modified graphene and 0.4 parts by weight of filler.

[0073] Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of isocyanate-modified graphene comprises the following steps:

[0074] Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 3 hours to obtain a graphene glue;

[0075] Step 2, dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and triethylenediamine or stannous octoate into the graphene glue to react, controlling the reaction temperature to 85° C. and the reaction time to 6 h to obtain a reactant;

[0076] Step 3: Wash the reactant in toluene to obtain isocyanate-modified graphene.

[0077] It should be noted that in Example 3 of the present application, the polymer resin is a copolymer of ethylene and hexene, and contains hydroxyl and carboxyl groups as active groups. The mass percentage of the active groups in the polymer resin is 5.4wt%, and the ethylene content is controlled to be 52wt%.

[0078] It should be mentioned that in the preparation step of isocyanate-based graphene in Example 3 of the present application, the concentration of graphene in the graphene glue is controlled to be 3 mg / ml. The concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4 g / ml, and in the process of adding the toluene solution of 1,6-hexamethylene diisocyanate to the graphene glue, the amount of the toluene solution of 1,6-hexamethylene diisocyanate is controlled to be 3.6:18 according to the mass ratio of graphene to 1,6-hexamethylene diisocyanate. At the same time, the filler is a mixture of calcium carbonate and silicon dioxide, and the mass percentage of calcium carbonate in the filler is 99%.

[0079] A method for preparing graphene plastic, used for preparing the graphene plastic as described above, comprises the following steps:

[0080] Step 1, mixing AS-737L and polymer resin, slowly heating to 50° C. to obtain a composite blank;

[0081] Step 2: Add the modified graphene and the filler to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer;

[0082] Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

[0083] Embodiment 4

[0084] The difference between the fourth embodiment and the first embodiment is that the graphene plastic in the fourth embodiment further comprises 0.03 parts by weight of butylene formate.

[0085] Embodiment 5

[0086] The difference between the fifth embodiment and the first embodiment is that the graphene plastic in the fifth embodiment further comprises 0.15 parts by weight of butylene formate.

[0087] Comparative Example 1

[0088] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, graphene oxide is used instead of modified graphene.

[0089] Comparative Example 2

[0090] The difference between Comparative Example 2 and Example 1 is that the polymer resin in Comparative Example 2 does not have an active group.

[0091] Comparative Example 3

[0092] The difference between Comparative Example 3 and Example 1 is that the polyurethane in Comparative Example 3 is a two-component polyurethane slurry purchased from Ailete of Linglite Technology Jiangsu Co., Ltd.

[0093] Performance tests were performed on Examples 1 to 5 and Comparative Examples 1 to 3:

[0094] 1. Test tear strength according to ASTMD624;

[0095] 2. Test hardness according to ASTMD2240;

[0096] 3. According to ASTMD412, test the tensile strength and elongation at break;

[0097] 4. According to the salt spray test, the temperature is controlled at 35℃ and treated with 5% NaCl aqueous solution. The corrosion resistance is evaluated based on the treatment results and divided into four levels: excellent, good, general and poor.

[0098] Table 1 Performance test results

[0099]

[0100] It can be seen from Table 1 that by adopting modified graphene and improving the binding ability of modified graphene with corresponding components, its stable lattice structure is combined with polyurethane, so as to have the effect of shielding corrosion to significantly reduce the risk of corrosion. Of course, by comparing Example 1 to Comparative Example 1, Comparative Example 2 and Comparative Example 3, it can be found that by adopting the modified graphene of the present application, compared with the existing graphene oxide, the mechanical properties are improved by more than 30%, which is specifically reflected in the significant improvement of tensile strength and elongation at break; and when the polymer resin with active groups and linear hydroxyl-terminated polyurethane of the present application are adopted, the dispersion of modified graphene is facilitated, and the modified graphene dispersed in the linear hydroxyl-terminated polyurethane and the polymer resin is combined with each component to improve the strength and toughness of the obtained graphene plastic, and then achieve the purpose of wear resistance and extended service life.

[0101] In summary, the present application provides a graphene plastic and a preparation method thereof, wherein the graphene plastic and the preparation method thereof are prepared by using thermoplastic elastomer, polymer resin, modified graphene and filler as components to obtain graphene plastic, on the one hand, the amount of graphene added is controlled to effectively control the cost, and on the other hand, the graphene is grafted and modified, so that during the grafting reaction of the modified graphene with 1,6-hexamethylene diisocyanate, one end -NCO is in an unreacted state, thereby having the effect of being effectively dispersed in the thermoplastic elastomer and polymer resin while avoiding the reduction in the strength of the graphene plastic due to the reduction in the amount of graphene. At the same time, by subjecting the graphene to a grafting modification reaction, the agglomeration phenomenon of the graphene after addition is avoided, thereby giving full play to the physical and chemical properties of the modified graphene, while effectively enhancing the strength of the graphene plastic, the purpose of shielding corrosion to significantly reduce the risk of corrosion is achieved. The modified graphene prepared by the preparation steps of the present application has the function of avoiding the synchronous reaction of the isocyanate groups at both ends of 1,6-hexamethylene diisocyanate, while reducing the amount of hydrophilic groups such as hydroxyl groups on the surface of graphene oxide, and is used to improve the surface hydrophobicity of the graphene plastic, thereby achieving the purpose of significantly improving the strength and wear resistance of the graphene plastic.

[0102] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0103] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0104] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A graphene plastic, characterized in that: The composition comprises the following components in parts by weight: 100-120 parts of thermoplastic elastomer, 30-60 parts of polymer resin, 0.15-0.5 parts of modified graphene, 0.1-0.4 parts of filler; Wherein, the modified graphene is isocyanate-modified graphene, and the preparation of the isocyanate-modified graphene comprises the following steps: Step 1, introducing graphene oxide into N,N-dimethylformamide, and treating it in an ultrasonic water bath for 0.5-3h to obtain a graphene glue; Step 2, dropwise adding a toluene solution of 1,6-hexamethylene diisocyanate and a catalyst into the graphene glue to react, controlling the reaction temperature to 80-85° C. and the reaction time to 4-6 hours to obtain a reactant; Step 3, washing the reactant in toluene to obtain isocyanate-modified graphene; The polymer resin is at least one of a copolymer of ethylene and propylene, butene, hexene or octene, and contains at least one of a hydroxyl group, a thiol group or a carboxyl group as an active group, and the mass percentage of the active group to the polymer resin is 1.3-5.8wt%, and the content of ethylene is greater than 50wt%; the thermoplastic elastomer is a linear hydroxyl-terminated polyurethane.

2. The graphene plastic according to claim 1, characterized in that: The linear hydroxyl-terminated polyurethane is AS-737L purchased from BASF.

3. The graphene plastic according to claim 1, characterized in that: The concentration of graphene in the graphene glue is 3 mg / ml; the concentration of 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 0.4 g / ml, and the mass ratio of graphene in the graphene glue to 1,6-hexamethylene diisocyanate in the toluene solution of 1,6-hexamethylene diisocyanate is 3-4:

18.

4. The graphene plastic according to claim 1, characterized in that: The filler is calcium carbonate or a mixture of calcium carbonate and at least one of polytetrafluoroethylene powder, talcum powder, silicon dioxide and hollow glass microspheres, and the mass percentage of calcium carbonate in the filler is greater than 97%.

5. The graphene plastic according to claim 1, characterized in that: The catalyst is triethylenediamine or stannous octoate.

6. The graphene plastic according to claim 1, characterized in that: It also includes 0.01-0.2 parts by weight of butylene formate.

7. A method for preparing a graphene plastic, for preparing the graphene plastic according to any one of claims 1 to 6, characterized in that: The steps include: Step 1, stirring and mixing the thermoplastic elastomer and the polymer resin, and slowly heating to 50° C. to obtain a combined blank; Step 2: Add the modified graphene and the filler to the combined blank in sequence, gradually increase the temperature to 75° C., continue stirring and react at a constant temperature for 2 hours to obtain a prepolymer; Step 3: Add butyl carboxylic acid to the prepolymer, and obtain graphene plastic after stirring and reacting.

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