CN114395160A - Graphene modified polyurethane composite material and preparation method thereof - Google Patents
Graphene modified polyurethane composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a graphene modified polyurethane composite material and a preparation method thereof, wherein the graphene modified polyurethane composite material is prepared from the following raw materials in parts by weight: 55-65 parts of polyether polyol, 35-45 parts of polyisocyanate, 2-5 parts of modified graphene, 0.5-1 part of catalyst, 3-5 parts of foaming agent, 0.5-3 parts of coupling agent and 5-15 parts of modified inorganic fiber. According to the invention, the graphene and the inorganic fiber are modified, so that the dispersibility and compatibility of the graphene in polyurethane are improved, and the prepared graphene/polyurethane composite material has high corrosion resistance, high hardness and excellent cold resistance and heat resistance; meanwhile, the added modified inorganic fiber improves the mechanical property of the polyurethane composite material after foaming. The method provided by the invention is simple to operate, low in cost and wide in application, and the prepared composite material is good in comprehensive properties such as thermal stability, mechanical property and the like.
Description
Technical Field
The invention belongs to the technical field of polyurethane composite materials, and particularly relates to a graphene modified polyurethane composite material and a preparation method thereof.
Background
The polyurethane is a block copolymer with both plasticity and elasticity, and a molecular chain contains ester groups, ether groups, carbamate groups, carbamido groups and other groups, so that the polyurethane has higher mechanical strength and elasticity and good low-temperature flexibility. The method is widely used for manufacturing microporous foam, sealing gaskets, insulating plates, tires, hard plastic parts, synthetic leather and other fields. Because polyurethane is a high molecular polymer consisting of an alternating sequence of soft and hard segments, the application of polyurethane is limited to a certain extent due to insufficient performance in the aspects of electric conduction, heat conduction and the like, and therefore the polyurethane material needs to be modified.
With the development of nano materials, the preparation of polymer composite materials by nano materials becomes a research hotspot at present. Since the graphene is found to have excellent mechanical, heat-conducting and electric-conducting properties, the graphene can be used as a filler to be compounded with a polymer, and the performance of the polymer is remarkably improved under the condition of adding a small amount of the graphene. The graphene is a layered compound which is composed of six-membered rings of carbon elements, inert in surface and stable, the thickness of single-layer graphene is less than 1nm, the area size is between several and dozens of micrometers, and the graphene sheet layers are stacked together under the action of pi-pi stacking groups and strong van der Waals force, so that the graphene sheet layers are difficult to uniformly disperse in aqueous solutions, common solvents or other polymer matrixes. Particularly in aqueous solution, due to the surface chemical inertness and hydrophobicity of graphene and the large surface area, graphene is extremely easy to agglomerate and difficult to uniformly disperse, so that the application of graphene is greatly limited. The graphene surface has large van der waals force, so that an agglomeration phenomenon can be generated, the compatibility with the polymer is poor, and the dispersion is difficult to be uniform, so that the graphene surface needs to be functionally modified, and the dispersibility in the polymer and the interface compatibility between the graphene surface and the polymer are improved.
At present, the main methods for compounding graphene and a high polymer material include a chemical method of in-situ polymerization and a physical method of solution mechanical blending, but in the methods, effective dispersion of graphene and continuity of a microstructure are technical bottlenecks which restrict development of graphene, and the performance of the obtained composite material hardly reaches the standard of industrial application. How to obtain a graphene polymer composite material which is uniformly dispersed and has a continuous microstructure conductive network is a key technology of graphene composite materials which needs to be solved urgently at present. CN 103319999A adopts hydrazine hydrate to reduce graphene oxide and then disperses in waterborne polyurethane, and then 3-methacryloxypropyl trimethoxy silane coupling agent is added to prepare the graphene/polyurethane anti-electromagnetic radiation material.
A large number of researches show that the compounding of the graphene and the polyurethane can improve the mechanical property, the antistatic property and the like of the polyurethane material. However, due to strong van der waals force (pi-pi stacking) between graphene sheets, the graphene sheets are easy to adsorb and gather together, so that the graphene sheets are poor in dispersibility in a plurality of organic solvents and high molecules, the compatibility and the dispersibility of the graphene sheets in polymers are influenced, the performance of the composite material is adversely affected, and how to improve the dispersibility of the graphene in the polyurethane composite material and the compatibility of the graphene sheets with the material is improved, so that the comprehensive performance of the polyurethane composite material is improved, and the graphene sheets become a hotspot of research in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the graphene modified polyurethane composite material and the preparation method thereof, the method is simple to operate, low in cost and wide in application, and the prepared composite material is good in comprehensive performances such as thermal stability, mechanical property and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
the graphene modified polyurethane composite material is prepared from the following raw materials in parts by weight:
preferably, the polyether polyol is one or more of polyoxypropylene diol, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerized diol; the polyisocyanate is one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, 1, 6-hexamethylene diisocyanate and dicyclohexylmethane diisocyanate; the catalyst is one or more of stannous octoate, dibutyltin dioctoate and triethylene diamine; the foaming agent is one or more of water, cyclopentane and methyl formate; the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
Preferably, the preparation method of the modified graphene comprises the following steps:
adding graphene into N, N-dimethylformamide, then adding polyvinylpyrrolidone, and performing ultrasonic dispersion to obtain a graphene dispersion liquid; and adding isophorone diisocyanate into the graphene dispersion liquid, reacting for 3-5h at 70-90 ℃, continuously adding dimethylolpropionic acid, stirring for reaction, filtering and washing after the reaction is finished, and drying a filter cake to obtain the modified graphene.
Preferably, the mass ratio of the graphene to the polyvinylpyrrolidone to the isophorone diisocyanate to the dimethylolpropionic acid is 100: 1-3: 5-10.
Preferably, the stirring reaction temperature is 60-90 ℃, and the reaction time is 1-3 h; the drying temperature is 60-80 ℃, and the drying time is 4-8 h.
Preferably, the preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing titanium dioxide fibers, glass fibers and carbon fibers, immersing the mixture in concentrated nitric acid for 1-3h, filtering and drying the mixture, adding the mixture into deionized water, then adding cellulose, uniformly mixing the mixture, performing hydrothermal reaction at the temperature of 80-95 ℃ for 1-3h, and after the reaction is finished, centrifuging, washing and drying the product to obtain cellulose modified inorganic fibers;
(b) and (b) stirring and activating the cellulose modified inorganic fiber obtained in the step (a) at a high speed, adding the cellulose modified inorganic fiber into a coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
Preferably, the mass ratio of the titanium dioxide fibers, the glass fibers, the carbon fibers and the cellulose in the step (a) is 1: 1-3; the mass ratio of the cellulose modified inorganic fiber to the KH550 in the step (b) is 100: 1-3; in the step (b), the stirring speed is 2000r/min, the stirring temperature is 60-70 ℃, and the stirring time is 1-2 h.
The invention also provides a preparation method of the graphene modified polyurethane composite material, which comprises the following steps:
(1) mixing polyether polyol, modified graphene, a catalyst, a foaming agent and a coupling agent, and stirring for reaction to obtain a mixture A;
(2) mixing modified inorganic fibers and polyisocyanate, adding the mixture into the mixture A obtained in the step (1), and stirring the mixture until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing, and demolding to obtain the graphene modified polyurethane composite material.
Preferably, the stirring reaction temperature in the step (1) is 40-50 ℃, the stirring speed is 200-400r/min, and the stirring time is 40-50 min.
Preferably, the stirring temperature in the step (2) is 25-35 ℃, and the stirring speed is 500-700 r/min.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the graphene modified polyurethane composite material provided by the invention, graphene is dispersed through polyvinylpyrrolidone, and firstly, electron pairs which are not bonded in oxygen and nitrogen atoms in a polyvinylpyrrolidone molecular structure and a conjugated structure in the graphene form a pi-pi electron effect which is adsorbed on the surface of a graphene sheet layer, so that the van der Waals effect between the graphene sheet layers is weakened; secondly, long hydrophobic chains in polyvinylpyrrolidone molecules can be wrapped on the surface of hydrophobic graphene, hydrophilic pyrrolidone faces outwards, the distance between graphene sheet layers is increased by utilizing the large steric hindrance effect of pyrrolidone groups and the mutual repulsive force between hydrophilic groups, and the graphene sheet layers are prevented from being re-aggregated, so that the uniform and stable graphene aqueous dispersion is obtained.
(2) According to the graphene modified polyurethane composite material provided by the invention, the graphene and isocyanate are subjected to ring opening and substitution reaction, oxygen-containing functional groups are introduced into the graphene, and a layer of organic matter is coated on the surface of the graphene, so that the phenomenon that the two-dimensional layer structure of the graphene is damaged by strong mechanical stirring and grinding can be avoided, and thus the complete modified graphene with a lower number of layers is prepared; the isocyanate modified graphene is subjected to surface modification to prepare the modified graphene with isocyanate connected with a pyrrolidone group, so that the low-layer modified graphene polyurethane prepared by grinding can be uniformly dispersed, and re-agglomeration is avoided; the crosslinking degree among molecules is increased in the polyurethane synthesis process by adding the modified graphene, so that linear molecules are crosslinked to form a net structure, and the prepared graphene/polyurethane composite material is high in corrosion resistance, high in hardness, and excellent in cold resistance and heat resistance.
(3) According to the graphene modified polyurethane composite material provided by the invention, the inorganic fiber is subjected to surface modification and activation treatment, so that the reactive groups on the surface of the inorganic fiber are increased, the reaction sites of the inorganic fiber and a coupling agent are increased, the compatibility of the inorganic fiber and polyurethane is obviously improved, and meanwhile, the coupling agent is added, so that the modification is realized
The inorganic fiber has better dispersibility in resin, and the problem of reduced mechanical property caused by agglomeration is reduced; particularly, the fiber particles treated by a proper coupling agent are filled into polyurethane, the fiber particles and the polyurethane are almost not separated, the combination is tighter, the winding coverage can be formed, and the mechanical property of the polyurethane composite material after foaming is improved.
(4) According to the graphene modified polyurethane composite material provided by the invention, the modified graphene and the modified inorganic fiber are used as the synergistic modifier, so that the polyurethane composite material has more excellent performances.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a graphene modified polyurethane composite material comprises the following steps:
(1) mixing 55 parts of polyoxypropylene glycol, 2 parts of modified graphene, 0.5 part of stannous octoate, 3 parts of cyclopentane and 0.5 part of silane coupling agent KH550, and stirring and reacting at 40 ℃ and 400r/min for 50min to obtain a mixture A;
(2) mixing 5 parts of modified inorganic fiber and 45 parts of isophorone diisocyanate, adding the mixture into the mixture A obtained in the step (1), and stirring at 25 ℃ and 500r/min until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing at 100 ℃ for 3h, and demolding to obtain the graphene modified polyurethane composite material.
The preparation method of the modified graphene comprises the following steps: adding 100 parts of graphene into 500 parts of N, N-dimethylformamide, then adding 1 part of polyvinylpyrrolidone, and performing ultrasonic dispersion for 1 hour to obtain a graphene dispersion liquid; and then adding 5 parts of isophorone diisocyanate into the graphene dispersion liquid, reacting for 3 hours at 70 ℃, continuously adding 5 parts of dimethylolpropionic acid, stirring and reacting for 3 hours at 60 ℃, filtering and washing after the reaction is finished, and drying a filter cake for 3 hours at 60 ℃ to obtain the modified graphene.
The preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing 10 parts of titanium dioxide fiber, 10 parts of glass fiber and 10 parts of carbon fiber, immersing the mixture in concentrated nitric acid for 1 hour, filtering and drying the mixture, adding the mixture into deionized water, then adding 10 parts of cellulose, uniformly mixing the mixture, performing hydrothermal reaction at 80 ℃ for 3 hours, and centrifuging, washing and drying the product after the reaction is finished to obtain cellulose modified inorganic fiber;
(b) and (b) stirring and activating the cellulose modified inorganic fiber (100 parts) obtained in the step (a) at a high speed for 1h at the temperature of 70 ℃ and the rotating speed of 2000r/min, adding the cellulose modified inorganic fiber into 1 part of coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
Example 2
A preparation method of a graphene modified polyurethane composite material comprises the following steps:
(1) mixing 60 parts of polytetrahydrofuran glycol, 3 parts of modified graphene, 0.7 part of triethylene diamine, 4 parts of methyl formate and 2 parts of titanic acid coupling agent CS-101, and stirring and reacting at 45 ℃ and 300r/min for 45min to obtain a mixture A;
(2) mixing 10 parts of modified inorganic fiber and 40 parts of diphenylmethane diisocyanate, and stirring at 30 ℃ and 600r/min until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing at 110 ℃ for 2h, and demolding to obtain the graphene modified polyurethane composite material.
The preparation method of the modified graphene comprises the following steps: adding 100 parts of graphene into 500 parts of N, N-dimethylformamide, then adding 2 parts of polyvinylpyrrolidone, and performing ultrasonic dispersion for 1 hour to obtain a graphene dispersion liquid; and then adding 7 parts of isophorone diisocyanate into the graphene dispersion liquid, reacting for 4 hours at 80 ℃, continuously adding 7 parts of dimethylolpropionic acid, stirring and reacting for 2 hours at 70 ℃, filtering and washing after the reaction is finished, and drying a filter cake for 2 hours at 80 ℃ to obtain the modified graphene.
The preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing 10 parts of titanium dioxide fiber, 10 parts of glass fiber and 10 parts of carbon fiber, immersing the mixture in concentrated nitric acid for 2 hours, filtering and drying the mixture, adding the mixture into deionized water, then adding 20 parts of cellulose, uniformly mixing the mixture, performing hydrothermal reaction at 90 ℃ for 2 hours, and centrifuging, washing and drying the product after the reaction is finished to obtain cellulose modified inorganic fiber;
(b) and (b) stirring and activating the cellulose modified inorganic fiber (100 parts) obtained in the step (a) at a high speed for 1.5h at the temperature of 65 ℃ and the rotating speed of 2000r/min, adding the cellulose modified inorganic fiber into 2 parts of a coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
Example 3
A preparation method of a graphene modified polyurethane composite material comprises the following steps:
(1) mixing 65 parts of tetrahydrofuran-propylene oxide copolymer glycol, 5 parts of modified graphene, 1 part of dibutyltin dioctoate, 5 parts of water and 3 parts of aluminate coupling agent DL-411, and stirring and reacting at 50 ℃ and 400r/min for 40min to obtain a mixture A;
(2) mixing 15 parts of modified inorganic fiber and 35 parts of dicyclohexylmethane diisocyanate, and stirring at 35 ℃ and 700r/min until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing at 120 ℃ for 1h, and demolding to obtain the graphene modified polyurethane composite material.
The preparation method of the modified graphene comprises the following steps: adding 100 parts of graphene into 500 parts of N, N-dimethylformamide, then adding 3 parts of polyvinylpyrrolidone, and performing ultrasonic dispersion for 1 hour to obtain a graphene dispersion liquid; and then adding 10 parts of isophorone diisocyanate into the graphene dispersion liquid, reacting for 3 hours at 90 ℃, continuously adding 10 parts of dimethylolpropionic acid, stirring and reacting for 1 hour at 90 ℃, filtering and washing after the reaction is finished, and drying a filter cake for 3 hours at 90 ℃ to obtain the modified graphene.
The preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing 10 parts of titanium dioxide fiber, 10 parts of glass fiber and 10 parts of carbon fiber, immersing the mixture in concentrated nitric acid for 3 hours, filtering and drying the mixture, adding the mixture into deionized water, then adding 30 parts of cellulose, uniformly mixing the mixture, performing hydrothermal reaction at 95 ℃ for 1 hour, and centrifuging, washing and drying the product after the reaction is finished to obtain cellulose modified inorganic fiber;
(b) and (b) stirring and activating the cellulose modified inorganic fiber (100 parts) obtained in the step (a) at a high speed for 1h at the temperature of 70 ℃ and the rotating speed of 2000r/min, adding the cellulose modified inorganic fiber into 3 parts of a coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
Comparative example 1
A preparation method of a graphene modified polyurethane composite material comprises the following steps:
(1) mixing 55 parts of polyoxypropylene glycol, 0.5 part of stannous octoate, 3 parts of cyclopentane and 0.5 part of silane coupling agent KH550, and stirring and reacting at 40 ℃ and 400r/min for 50min to obtain a mixture A;
(2) mixing 5 parts of modified inorganic fiber and 45 parts of isophorone diisocyanate, adding the mixture into the mixture A obtained in the step (1), and stirring at 25 ℃ and 500r/min until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing at 100 ℃ for 3h, and demolding to obtain the graphene modified polyurethane composite material.
The preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing 10 parts of titanium dioxide fiber, 10 parts of glass fiber and 10 parts of carbon fiber, immersing the mixture in concentrated nitric acid for 1 hour, filtering and drying the mixture, adding the mixture into deionized water, then adding 10 parts of cellulose, uniformly mixing the mixture, performing hydrothermal reaction at 80 ℃ for 3 hours, and centrifuging, washing and drying the product after the reaction is finished to obtain cellulose modified inorganic fiber;
(b) and (b) stirring and activating the cellulose modified inorganic fiber (100 parts) obtained in the step (a) at a high speed for 1h at the temperature of 70 ℃ and the rotating speed of 2000r/min, adding the cellulose modified inorganic fiber into 1 part of coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
Comparative example 2
A preparation method of a graphene modified polyurethane composite material comprises the following steps:
(1) mixing 55 parts of polyoxypropylene glycol, 2 parts of graphene, 0.5 part of stannous octoate, 3 parts of cyclopentane and 0.5 part of silane coupling agent KH550, and stirring and reacting at 40 ℃ and 400r/min for 50min to obtain a mixture A;
(2) adding 45 parts of isophorone diisocyanate to the mixture A obtained in the step (1), and stirring at 25 ℃ and 500r/min until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing at 100 ℃ for 3h, and demolding to obtain the graphene modified polyurethane composite material.
The graphene modified polyurethane composite materials prepared in examples 1-3 and comparative examples 1-2 were subjected to a performance test. The density testing method comprises the following steps: according to the national standard GBT 6343-; the test method of the compressive strength at 50% compressive strain comprises the following steps: testing by using a double-upright-column bench testing machine, wherein the foam sample is prepared into a size of 40mm by 40mm, and the compression rate is 5 mm/min; the tensile strength and the elongation at break are tested according to the regulations of GB/T528-2009, the shear strength glass transition temperature is tested according to the regulations of GB/T19466.2-2004, and the test results are shown in the following table 1:
TABLE 1 polyurethane composites Performance test results
As can be seen from the above table, the graphene reinforced polyurethane composite material is adopted, and the surface modification is performed on the graphene, so that the dispersibility and the compatibility of the graphene in the composite material are improved, and the prepared composite material has higher fracture toughness and the strength of the polyurethane composite material is improved; meanwhile, the heat resistance of the composite material is improved by adding the modified inorganic fibers and cooperating with the graphene, so that the comprehensive performance of the composite material is improved. In the comparative example 1, the mechanical property and the heat resistance are obviously reduced because the modified graphene is not added; in comparative example 2, since graphene and inorganic fibers were not added, the performance was more degraded.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The graphene modified polyurethane composite material is characterized by comprising the following raw materials in parts by weight:
2. the graphene-modified polyurethane composite material according to claim 1, wherein the polyether polyol is one or more of polyoxypropylene glycol, polytetrahydrofuran glycol and tetrahydrofuran-propylene oxide copolymerized glycol; the polyisocyanate is one or more of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, 1, 6-hexamethylene diisocyanate and dicyclohexylmethane diisocyanate; the catalyst is one or more of stannous octoate, dibutyltin dioctoate and triethylene diamine; the foaming agent is one or more of water, cyclopentane and methyl formate; the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
3. The graphene-modified polyurethane composite material according to claim 1, wherein the preparation method of the modified graphene comprises the following steps:
adding graphene into N, N-dimethylformamide, then adding polyvinylpyrrolidone, and performing ultrasonic dispersion to obtain a graphene dispersion liquid; and adding isophorone diisocyanate into the graphene dispersion liquid, reacting for 3-5h at 70-90 ℃, continuously adding dimethylolpropionic acid, stirring for reaction, filtering and washing after the reaction is finished, and drying a filter cake to obtain the modified graphene.
4. The graphene-modified polyurethane composite material of claim 3, wherein the graphene: polyvinylpyrrolidone: the mass ratio of the isophorone diisocyanate to the dimethylolpropionic acid is 100: 1-3: 5-10.
5. The graphene-modified polyurethane composite material according to claim 3, wherein the stirring reaction temperature is 60-90 ℃ and the reaction time is 1-3 h; the drying temperature is 60-80 ℃, and the drying time is 4-8 h.
6. The graphene-modified polyurethane composite material according to claim 1, wherein the preparation method of the modified inorganic fiber comprises the following steps:
(a) uniformly mixing titanium dioxide fibers, glass fibers and carbon fibers, immersing the mixture in concentrated nitric acid for 1-3h, filtering and drying the mixture, adding the mixture into deionized water, then adding cellulose, uniformly mixing the mixture, performing hydrothermal reaction at the temperature of 80-95 ℃ for 1-3h, and after the reaction is finished, centrifuging, washing and drying the product to obtain cellulose modified inorganic fibers;
(b) and (b) stirring and activating the cellulose modified inorganic fiber obtained in the step (a) at a high speed, adding the cellulose modified inorganic fiber into a coupling agent KH550, uniformly mixing, and drying to obtain the modified inorganic fiber.
7. The graphene-modified polyurethane composite material according to claim 6, wherein the mass ratio of the titanium dioxide fibers, the glass fibers, the carbon fibers and the cellulose in the step (a) is 1: 1-3; the mass ratio of the cellulose modified inorganic fiber to the KH550 in the step (b) is 100: 1-3; in the step (b), the stirring speed is 2000r/min, the stirring temperature is 60-70 ℃, and the stirring time is 1-2 h.
8. A preparation method of the graphene modified polyurethane composite material as described in any one of claims 1 to 7, comprising the following steps:
(1) mixing polyether polyol, modified graphene, a catalyst, a foaming agent and a coupling agent, and stirring for reaction to obtain a mixture A;
(2) mixing modified inorganic fibers and polyisocyanate, adding the mixture into the mixture A obtained in the step (1), and stirring the mixture until the reaction starts to obtain a mixture B;
(3) and pouring the mixture B into a mold, standing for foaming, curing, and demolding to obtain the graphene modified polyurethane composite material.
9. The method as claimed in claim 8, wherein the stirring reaction temperature in step (1) is 40-50 ℃, the stirring speed is 200-400r/min, and the stirring time is 40-50 min.
10. The method as claimed in claim 8, wherein the stirring temperature in step (2) is 25-35 ℃ and the stirring speed is 500-700 r/min.
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| CN116041945A (en) * | 2023-01-30 | 2023-05-02 | 湖州高裕家居科技有限公司 | Polyurethane material and preparation method thereof |
| CN116478528A (en) * | 2023-03-13 | 2023-07-25 | 安徽誉林新材料科技有限公司 | Graphene modified polyurethane resin material and preparation process thereof |
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