CN110305277B - Preparation method of modified graphene oxide polyurethane coating material - Google Patents
Preparation method of modified graphene oxide polyurethane coating material Download PDFInfo
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- CN110305277B CN110305277B CN201810256168.7A CN201810256168A CN110305277B CN 110305277 B CN110305277 B CN 110305277B CN 201810256168 A CN201810256168 A CN 201810256168A CN 110305277 B CN110305277 B CN 110305277B
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- 239000011527 polyurethane coating Substances 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 21
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims abstract description 47
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000011259 mixed solution Substances 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 7
- -1 isophorone diisocyanate modified graphene Chemical class 0.000 claims abstract description 7
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
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- HJOVHMDZYOCNQW-UHFFFAOYSA-N Isophorone Natural products CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims 1
- 238000002679 ablation Methods 0.000 abstract description 12
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- 238000002156 mixing Methods 0.000 description 12
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- 230000000052 comparative effect Effects 0.000 description 8
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- 239000011256 inorganic filler Substances 0.000 description 4
- 229910003475 inorganic filler Inorganic materials 0.000 description 4
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- 230000008023 solidification Effects 0.000 description 4
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- 239000002518 antifoaming agent Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
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- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
- C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
- C08G18/0847—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers
- C08G18/0852—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers the solvents being organic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention discloses a preparation method of a modified graphene oxide polyurethane coating material. Adding isophorone diisocyanate modified graphene oxide into a component A of a polyurethane coating, adding butyl acetate, performing ultrasonic dispersion to obtain a mixed solution of MGO/A components, drying the mixed solution to remove the butyl acetate, adding a component B, adding 10-15% of the butyl acetate in total mass of A, B, uniformly stirring, vacuumizing, pouring into a mold, and curing to obtain the modified graphene oxide polyurethane coating material. According to the invention, the Young modulus of the coating material is improved by introducing the modified graphene oxide, and the prepared modified graphene oxide polyurethane coating material not only has a remarkably reduced residue rate, but also shows good ablation resistance.
Description
Technical Field
The invention belongs to the technical field of preparation of coating materials, and relates to a preparation method of a modified graphene oxide polyurethane coating material.
Background
The coating layer is an important component of solid rocket propellant charge and is a decisive factor influencing the working state and the service life of a rocket engine. The coating has effects such as limited combustion, adiabatic and buffering, can restrict the burning area of powder charge surface combustion in order to control the grain, satisfies rocket engine's interior trajectory performance, prevents that high temperature gas from damaging the combustion chamber casing, buffers the stress transfer between casing and the propellant. The coating layer has higher requirements on the ablation resistance, the bonding strength, the small molecule migration resistance, the mechanical property and the combustion residues of the material.
The polyurethane has higher strength and good elasticity, and can keep higher elasticity, higher bearing capacity, excellent wear resistance, cutting resistance and bonding performance in a wider hardness range. The polyurethane has excellent oil resistance and chemical resistance, excellent radiation resistance, oxygen resistance and ozone resistance, good fatigue resistance and shock resistance, and is suitable for high-frequency deflection application. The polyurethane has the advantages of high impact resistance, good low-temperature flexibility, good elastic memory and aging resistance, high temperature resistance by adopting a special formula, convenient processing, easy forming and low cost, and can be widely applied to a coating layer of solid propellant charge and a shell bonding type charge lining layer. The polyurethane coating layer becomes an important variety for charging and coating at home and abroad.
When the existing gas generator adopts a coating layer which takes polyurethane as a main body to carry out a combined test, residues exist in filters of a front cabin and a rear cabin, so that the filters are blocked and cannot work normally. Therefore, the existing polyurethane coating formula system needs to be improved, so that the novel polyurethane coating meets the requirements of stable combustion, good gas forming property and less combustion residues.
Graphene is a benzene ring-shaped structural material formed by closely arranging carbon atoms in a two-dimensional space, and has excellent mechanical properties, electrical conductivity and heat conductivity. Due to the unique crystal structure and electronic structure, the graphene has excellent electrical, magnetic, thermal and mechanical properties, and has great application potential in the fields of high-performance nano electronic devices, composite materials, field emission materials, sensors, transparent electrodes, energy storage and the like.
Disclosure of Invention
Aiming at the problems that the high-temperature performance of the existing polyurethane is poor, inorganic filler (such as aluminum hydroxide and the like) needs to be added into a polyurethane coating component in the practical application process to improve the ablation resistance, but the residue rate is increased due to the addition of the filler, a filter is blocked and the like, the invention provides a preparation method of a modified graphene oxide polyurethane coating material with reduced combustion residue rate and bubble content and improved Young modulus and ablation resistance.
The technical scheme for realizing the purpose of the invention is as follows:
the preparation method of the modified graphene oxide polyurethane coating material comprises the following steps of firstly preparing MGO/A component mixed solution by an ultrasonic re-drying method, and then adding a component B and a proper amount of butyl acetate to prepare the modified graphene oxide polyurethane coating material, wherein the specific steps are as follows:
step 1, adding isophorone diisocyanate (IPDI) Modified Graphene Oxide (MGO) into a component A of a polyurethane coating, adding butyl acetate, stirring, and performing ultrasonic dispersion to obtain an MGO/A component mixed solution, wherein the component A is a hydroxyl-containing polyurethane component;
and 2, drying the MGO/A component mixed solution, removing butyl acetate, adding a component B, adding 10-15% of butyl acetate of the total mass of the A and the B, uniformly stirring, keeping the mixed solution under the vacuum degree of 0.09-0.1 MPa for more than 5min, pouring the mixed solution into a mold, and curing to obtain the modified graphene oxide polyurethane coating material, wherein the component B is a polyurethane component containing isocyanate groups, and the IPDI Modified Graphene Oxide (MGO) accounts for 2-5% of the total mass of the A and the B.
The preparation method of the IPDI modified graphene oxide refers to the [ Houyan, Wuminghua, Yudehang, et al ] functionalized graphene modified waterborne polyurethane and the performance [ J ] of the polyurethane, 2015,36(10):80-85 ], but does not use hydrazine hydrate to reduce the graphene oxide.
In the step 1, the mass ratio of butyl acetate to MGO is 100: 1.
in the step 1, the ultrasonic dispersion time is 0.5-1 h.
In the step 2, the drying condition is drying for 48 hours at 50 ℃.
In the step 2, the mass ratio of the component A to the component B is 1: 1.1.
In the step 2, the vacuum degree is 0.098 MPa.
In the step 2, the curing temperature is 45-50 ℃, and the curing time is 24-48 h.
Compared with the prior art, the invention has the following advantages:
according to the modified graphene oxide polyurethane coating material, the ablation resistance of the coating material is improved by utilizing the good thermal stability of graphene; the excellent mechanical property of the graphene is utilized, so that the Young modulus of the material is improved; the viscosity is reduced by adopting a solvent and a vacuumizing method is adopted, so that the bubble content in the sample is reduced; meanwhile, the MGO can completely react with oxygen at high temperature, so that the residue rate of the system is reduced.
Drawings
FIG. 1 is an infrared spectrum of MGO and GO.
FIG. 2 is a Raman spectrum of MGO and GO.
Fig. 3 is a stress-strain plot of polyurethane cladding materials with different MGO contents.
Detailed Description
The present invention will be described in more detail with reference to the following examples and the accompanying drawings. The A, B components described below refer to the A, B components of the polyurethane coating, respectively, and the contents described below are the fractions of MGO in the total mass of A, B.
Example 1 preparation of a polyurethane coating with 2% MGO content
(1) Weighing 2g of the component A and 84mg of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.42g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
Example 2 preparation of a polyurethane coating with a MGO content of 3%
(1) Weighing 2g of the component A and 126mg of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.42g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
Example 3 preparation of a polyurethane coating with 5% MGO content
(1) Weighing 2g of the component A and 0.21g of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.42g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
Example 4 preparation of a polyurethane coating with 5% MGO content
(1) Weighing 2g of the component A and 0.21g of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.63g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
Comparative example 1 preparation of a polyurethane coating with a MGO content of 0%
(1) Weighing 2gA components and 2.2gB components;
(2) a, B components are mixed, 0.42g of butyl acetate is added, and the mixture is fully stirred;
(3) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(4) pouring into a mold, and curing for 24 hours at 45 ℃ to obtain a sample.
Comparative example 2 preparation of a polyurethane coating with 8% MGO content
(1) Weighing 2g of the component A and 0.336g of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) weighing 2.2g of the component B and 0.42g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
In this case, the addition amount of MGO is relatively large, and the viscosity of the mixed liquid is large, so that the defoaming effect of the vacuuming is poor; the bubbles remained in the mixed solution can float slowly in the solidification process, so that the surface of the sample presents an orange peel phenomenon, and a certain amount of bubbles exist in the sample.
Comparative example 3 preparation of a polyurethane coating with 5% MGO content (without butyl acetate, without evacuation)
(1) Weighing 2g A components and 0.21g MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B, mixing and stirring uniformly;
(5) pouring the mixed solution into a mould, and curing at 45 ℃ for 24h to obtain a sample.
In this case, the viscosity of the system is very high, and a large amount of bubbles are introduced in the mechanical stirring process; poor fluidity due to high viscosity, so that the workability is extremely poor; in the curing process, because the viscosity is too high, bubbles in the system are difficult to float upwards, so that the surface of the sample presents a dense small-hole appearance, and a large amount of bubbles are distributed in the sample.
Comparative example 4 preparation of a polyurethane coating with 5% MGO content (without evacuation)
(1) Weighing 2g A components and 0.21g MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g B components and 0.42g butyl acetate, and stirring uniformly;
(5) pouring the mixed solution into a mould, and curing at 45 ℃ for 24h to obtain a sample.
In this case, the viscosity of the system is low, bubbles in the system can float up automatically, the surface of the sample is relatively smooth, but the initial bubbles are more, and the bubbles cannot float up completely in the solidification process, so that a plurality of small bubbles still remain in the sample.
Comparative example 5 preparation of a polyurethane coating with 5% MGO content (without butyl acetate)
(1) Weighing 2g A components and 0.21g MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g B components, mixing and stirring uniformly;
(5) keeping the vacuum degree of 0.098MPa for 5 min;
(6) pouring the mixed solution into a mould, and curing at 45 ℃ for 24h to obtain a sample.
Under the condition, the viscosity of the system is high, the system is not favorable for vacuumizing and bubble removal, bubbles in the system can still be pumped out after the vacuum degree is kept for 5min under 0.098MPa, the interior of a cured sample is basically free of bubbles, but poor leveling property caused by high viscosity causes a large number of small holes on the surface of the sample; the poor fluidity due to the high viscosity makes the workability extremely poor.
COMPARATIVE EXAMPLE 6 preparation of polyurethane coating (5% butyl acetate) with 5% MGO content
(1) Weighing 2g of the component A and 0.21g of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.21g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
In this case, the amount of solvent added is small, the reduction of system viscosity is limited, the effect of vacuumizing to remove bubbles is poor, and a small amount of small bubbles still exist in the cured sample.
COMPARATIVE EXAMPLE 7 preparation of polyurethane coating (20% butyl acetate) with 5% MGO content
(1) Weighing 2g of the component A and 0.21g of MGO powder, and mixing;
(2) adding a proper amount of butyl acetate, uniformly stirring, and performing ultrasonic dispersion for 30 min;
(3) keeping the temperature of the mixed solution at 50 ℃ for 48h, and removing butyl acetate;
(4) adding 2.2g of the component B and 0.84g of butyl acetate, and uniformly stirring;
(5) keeping the mixed solution at vacuum degree of 0.098MPa for 5 min;
(6) pouring into a mold, and curing at 45 ℃ for 24 hours to obtain a sample.
Under the condition, the addition amount of the solvent is large, the viscosity of the system is low, the filler sedimentation phenomenon appears in the mixed solution, and the obvious filler deposition appearance at the bottom of the sample can be observed after solidification.
In summary, although the polyurethane component has a high degree of polymerization which is beneficial for curing at normal temperature, the high viscosity easily causes a problem of bubbles, and affects the mechanical properties and ablation resistance of the material. Because the polyurethane system does not generate gas in the curing process, the bubbles in the sample are mainly generated by the fact that the bubbles brought in by the stirring stage cannot float upwards before the curing stage is completed. The main solution is as follows: reducing the viscosity of the system to enable bubbles to float up automatically; secondly, the bubbles are forced to float upwards or break by external force, such as vacuum pumping and defoaming agent. Butyl acetate is used for reducing viscosity, and the butyl acetate has moderate polarity, strong dissolving capacity for polyurethane and is beneficial to the curing reaction.
As is clear from the above examples and comparative examples, the following problems are present when only route (i) is employed: (1) when the viscosity is reduced more, the inorganic filler in the system can be settled in the curing process, so that the components are not uniform, the inorganic filler deposition part is easy to become a crack source, and the mechanical property of the material is seriously influenced; (2) when the viscosity is reduced a little, the floating rate of the bubbles is slow, and the bubbles can not float completely before the solidification is finished, so that a large amount of small bubbles which are dispersed are still distributed.
When only the approach of the second embodiment is adopted, the following problems exist: (1) when only vacuum pumping is carried out, bubbles in the system can be forced to float upwards, but the problem of poor construction performance caused by high viscosity of the system is not changed, and meanwhile, a large number of small holes are formed in the surface of the prepared sample, so that the mechanical property test is not facilitated; (2) when only the defoaming agent is adopted, the large bubbles are broken into small bubbles due to the problem of viscosity, and only the effect of foam homogenizing can be achieved.
After the approaches of the first and the second are combined, on the basis of slightly reducing the viscosity, a vacuumizing mode is adopted, so that bubbles are eliminated, the surface of a sample is smooth, the sedimentation of inorganic filler can be prevented, and the construction performance is improved.
Example 5 application Properties of modified graphene oxide polyurethane coating Material
1. Residue rate test
Residue rate test conditions: raising the temperature to 800 ℃ at the speed of 5 ℃/min in a muffle furnace in air atmosphere, preserving the temperature for 1h, and then slowly reducing the temperature to the normal temperature.
Residue rate formula: the residue ratio (initial sample mass-sample weight loss)/initial sample mass × 100%.
As is clear from the above table, the addition of MGO significantly reduced the residue rate.
2. Ablation Performance testing
According to the GJB323A-96 ablation material ablation experimental method, oxygen-acetylene flame flow is used as a pyrogen, the material is vertically burned on a sample, the material is ablated, and the thickness change of the sample before and after the test is measured, so that the line ablation rate of a coating layer sample is calculated.
As can be seen from the above table, the wire ablation rate was significantly reduced and the ablation resistance was significantly improved after MGO was added.
Claims (7)
1. The preparation method of the modified graphene oxide polyurethane coating material is characterized by comprising the following specific steps of:
step 1, adding isophorone diisocyanate modified graphene oxide into a component A of a polyurethane coating layer, adding butyl acetate, stirring, and performing ultrasonic dispersion to obtain an MGO/A component mixed solution, wherein the component A is a hydroxyl-containing polyurethane component;
and 2, drying the MGO/A component mixed solution, removing butyl acetate, adding a component B, adding 10-15% of butyl acetate of the total mass of the A and the B, uniformly stirring, keeping the mixed solution at a vacuum degree of 0.09-0.1 MPa for more than 5min, pouring the mixed solution into a mold, and curing to obtain the modified graphene oxide polyurethane coating material, wherein the component B is a polyurethane component containing isocyanate groups, and the isophorone diisocyanate modified graphene oxide accounts for 2-5% of the total mass of the A and the B.
2. The preparation method according to claim 1, wherein in the step 1, the mass ratio of the butyl acetate to the isophorone diisocyanate-modified graphene oxide is 100: 1.
3. the preparation method according to claim 1, wherein in the step 1, the ultrasonic dispersion time is 0.5-1 h.
4. The method according to claim 1, wherein the drying condition in step 2 is 50 ℃ for 48 hours.
5. The method according to claim 1, wherein in step 2, the mass ratio of the component A to the component B is 1: 1.1.
6. The method according to claim 1, wherein the degree of vacuum in step 2 is 0.098 MPa.
7. The preparation method according to claim 1, wherein in the step 2, the curing temperature is 45-50 ℃ and the curing time is 24-48 h.
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