CN114409950A - High-conductivity graphene modified polystyrene foam board and preparation method thereof - Google Patents
High-conductivity graphene modified polystyrene foam board and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 90
- 229920006327 polystyrene foam Polymers 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims description 7
- 239000004793 Polystyrene Substances 0.000 claims abstract description 51
- 229920002223 polystyrene Polymers 0.000 claims abstract description 51
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims abstract description 40
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 27
- -1 amino free radical Chemical class 0.000 claims abstract description 26
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 20
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 27
- 239000000839 emulsion Substances 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000004156 Azodicarbonamide Substances 0.000 claims description 18
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 18
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 18
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 18
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 18
- 239000004088 foaming agent Substances 0.000 claims description 18
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 18
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 18
- 239000002562 thickening agent Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 238000000967 suction filtration Methods 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 9
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000003760 magnetic stirring Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000012046 mixed solvent Substances 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 3
- 239000006260 foam Substances 0.000 abstract description 3
- 230000000977 initiatory effect Effects 0.000 abstract description 3
- 238000010382 chemical cross-linking Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229920000620 organic polymer Polymers 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/10—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to inorganic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention relates to the technical field of polystyrene and discloses a high-conductivity graphene modified polystyrene foam board, wherein oxidized graphene reacts with hexamethylenediamine to obtain aminated graphene, the aminated graphene forms an amino free radical on the surface of the graphene under the action of ammonium persulfate, the amino free radical on the surface of the graphene and a hydrogen sulfate free radical generated by decomposition of ammonium persulfate form an oxidation-reduction initiation system, a styrene monomer is initiated to carry out in-situ polymerization on the surface of the graphene to obtain the high-conductivity graphene modified polystyrene foam board, the stably dispersed graphene forms a chemical cross-linking point in a polystyrene matrix to form a stable conductive network, the conductivity of the polystyrene is effectively improved, when external force is applied, the stress applied to the polystyrene is transferred to the graphene, and the graphene can absorb energy brought by a part of the stress, thereby improving the mechanical property of the composite foam board.
Description
Technical Field
The invention relates to the technical field of polystyrene, in particular to a high-conductivity graphene modified polystyrene foam board and a preparation method thereof.
Background
Graphene is a two-dimensional crystal nano material composed of a single layer of carbon atoms, has excellent properties such as thermal conductivity, electrical conductivity, high hardness and high strength, has irreplaceable effects in various fields such as electricity, optics and energy storage, and has been developed since the beginning, a large number of oxygen-containing functional groups are contained on the surface of graphene after oxidation, so that graphene has strong hydrophilicity, but secondary agglomeration is very easy to form in organic polymer materials such as polyurethane and polystyrene, so that graphene cannot be used as functional reinforcing filler to functionally reinforce organic polymers such as polyurethane and polystyrene, so that graphene needs to be modified to improve the dispersibility of graphene in organic polymer materials such as polyurethane and polystyrene, and the excellent properties of graphene are combined into the organic polymer materials, the comprehensive properties of the organic polymer material such as mechanics, conductivity and the like are improved.
Polystyrene has the advantages of innocuity, easy coloring, easy processing, good electrical insulation property and the like, has extremely important function in the fields of paint, daily decoration, electrical insulating materials, heat insulating materials and the like, but the traditional polystyrene has poor conductivity and mechanical property, under the current environment of rapid social development, the defects are gradually difficult to meet the requirements of people, therefore, a modification method of polystyrene is urgently needed, and with the progress of research, it is found that inorganic nano materials such as carbon nanotubes and graphene with excellent performance are filled in polystyrene, the excellent performance of inorganic nano-fillers such as carbon nano-tubes, graphene and the like can be organically integrated into polystyrene, and through the mode, can achieve the aim of modifying the polystyrene and effectively improve the comprehensive properties of the polystyrene, such as the conductivity, the mechanical property and the like.
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the high-conductivity graphene modified polystyrene foam board and the preparation method thereof, so that the problem of poor graphene dispersibility is solved, and the problems of poor conductivity and mechanical property of polystyrene are solved.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a high-conductivity graphene modified polystyrene foam board comprises the following steps:
(1) adding deionized water, graphene oxide and hexamethylenediamine into a reactor, carrying out ultrasonic magnetic stirring, adding ammonia water to adjust the pH of the solution to 9-10, carrying out reaction, cooling the product, carrying out suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, styrene and aminated graphene, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 20-40 ℃, continuously adding ammonium persulfate, reacting, cooling a product, performing suction filtration, and purifying by using a Soxhlet extractor to obtain graphene modified polystyrene emulsion;
(3) adding the graphene modified polystyrene emulsion, the foaming agent azodicarbonamide, the thickening agent polyvinyl alcohol and the flatting agent epoxypropane modified polydimethylsiloxane into a reactor, uniformly mixing, pouring into a mould for curing, and pressing into a plate for molding to obtain the high-conductivity graphene modified polystyrene foam plate.
Preferably, the mass ratio of the graphene oxide to the hexamethylene diamine in the step (1) is 100: 300-400.
Preferably, the reaction temperature in the step (1) is 70-90 ℃, and the reaction time is 2-4 h.
Preferably, the mass ratio of the styrene to the aminated graphene to the ammonium persulfate in the step (2) is 100:0.5-5: 2-8.
Preferably, the reaction temperature in the step (2) is 70-95 ℃, and the reaction time is 45-55 h.
Preferably, the mass ratio of the graphene modified polystyrene emulsion, the foaming agent azodicarbonamide, the thickening agent polyvinyl alcohol and the leveling agent propylene oxide modified polydimethylsiloxane in the step (3) is 100:5-25:1-4: 1-6.
Preferably, the temperature for curing in the step (3) is 100-120 ℃, and the time is 1-3 h.
(III) advantageous technical effects
Compared with the prior art, the invention has the following beneficial technical effects:
according to the high-conductivity graphene modified polystyrene foam board, hydroxyl on the surface of graphene oxide reacts with amino of hexamethylene diamine in an alkaline environment to obtain aminated graphene, the aminated graphene forms amino free radicals on the surface of graphene under the action of ammonium persulfate, the amino free radicals on the surface of graphene and hydrogen sulfate free radicals generated by decomposition of ammonium persulfate form an oxidation-reduction initiation system, and styrene monomers are initiated to carry out in-situ polymerization on the surface of graphene to finally obtain the high-conductivity graphene modified polystyrene foam board, the graphene is connected to polystyrene through chemical bonds by the surface initiation grafting method, the interfacial affinity of the graphene and the polystyrene is effectively improved, the dispersion stability of the graphene is enhanced, and secondary agglomeration of the graphene in a polystyrene matrix is avoided, make the even dispersion of graphite alkene in the polystyrene base member, simultaneously, the graphite alkene of stable dispersion can form chemical crosslinking point in the polystyrene base member, improve polystyrene's cross-linking degree, can form stable electrically conductive network again, through the electric conductivity that graphite alkene is excellent, polystyrene's electric conductivity has been improved effectively, when the syntactic foam board receives the exogenic action, the stress that polystyrene received can shift to graphite alkene on, and the super high strength that graphite alkene possessed and the energy that some stress can be absorbed and bring, thereby improve the mechanical properties of syntactic foam board.
Detailed Description
To achieve the above object, the present invention provides the following embodiments and examples: a preparation method of a high-conductivity graphene modified polystyrene foam board comprises the following steps:
(1) adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100: 300-;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 20-40 ℃, continuously adding ammonium persulfate, wherein the mass ratio of styrene to the aminated graphene to the ammonium persulfate is 100:0.5-5:2-8, reacting at 70-95 ℃ for 45-55h, cooling the product, performing suction filtration, and purifying by using a Soxhlet extractor to obtain graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, a foaming agent azodicarbonamide, a thickening agent polyvinyl alcohol and a flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:5-25:1-4:1-6, uniformly mixing, pouring into a mold for curing and pressing for molding, and curing at the temperature of 100 ℃ and 120 ℃ for 1-3h to obtain the high-conductivity graphene modified polystyrene foam board.
Example 1
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:300, adding ammonia water to adjust the pH of a solution to 9 after ultrasonic magnetic stirring, reacting for 2 hours at 70 ℃, cooling a product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 20 ℃, continuously adding ammonium persulfate, wherein the mass ratio of styrene to aminated graphene to ammonium persulfate is 100:0.5:2, reacting for 45 hours at 70 ℃, cooling and carrying out suction filtration on a product, and purifying the product by using a Soxhlet extractor to obtain a graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, foaming agent azodicarbonamide, thickening agent polyvinyl alcohol and flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:5:1:1, uniformly mixing, pouring into a mould for curing and pressing into a plate for forming, and curing at 100 ℃ for 1h to obtain the high-conductivity graphene modified polystyrene foam plate.
Example 2
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:325, adding ammonia water to adjust the pH of a solution to 9 after ultrasonic magnetic stirring, reacting at 75 ℃ for 2.5 hours, cooling a product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 25 ℃, and continuously adding ammonium persulfate, wherein the mass ratio of styrene to aminated graphene to ammonium persulfate is 100:1.6:3.5, reacting for 48 hours at 75 ℃, cooling the product, performing suction filtration, and purifying by using a Soxhlet extractor to obtain graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, foaming agent azodicarbonamide, thickening agent polyvinyl alcohol and flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:10:1.75:2.25, uniformly mixing, pouring into a mold for curing and pressing for molding, and curing at 105 ℃ for 1.5 hours to obtain the high-conductivity graphene modified polystyrene foam board.
Example 3
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:350, adding ammonia water to adjust the pH of a solution to 9 after ultrasonic magnetic stirring, reacting for 3 hours at 80 ℃, cooling a product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 30 ℃, continuously adding ammonium persulfate, wherein the mass ratio of styrene to aminated graphene to ammonium persulfate is 100:2.7:5, reacting for 50 hours at 80 ℃, cooling and carrying out suction filtration on the product, and purifying the product by using a Soxhlet extractor to obtain graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, foaming agent azodicarbonamide, thickening agent polyvinyl alcohol and flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 10015:2.5:3.5, uniformly mixing, pouring into a mold for curing and pressing into a plate for molding, and curing at 110 ℃ for 2.5 hours to obtain the high-conductivity graphene modified polystyrene foam plate.
Example 4
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:375, performing ultrasonic magnetic stirring, adding ammonia water to adjust the pH of the solution to 10, reacting at 85 ℃ for 3.5 hours, cooling the product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 35 ℃, and continuously adding ammonium persulfate, wherein the mass ratio of styrene to aminated graphene to ammonium persulfate is 100:3.8:6.5, reacting for 52 hours at 90 ℃, cooling the product, performing suction filtration, and purifying by using a Soxhlet extractor to obtain graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, a foaming agent azodicarbonamide, a thickening agent polyvinyl alcohol and a flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:20:3.25:4.75, uniformly mixing, pouring into a mold for curing and pressing for molding, and curing at 115 ℃ for 2.5 hours to obtain the high-conductivity graphene modified polystyrene foam board.
Example 5
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:400, adding ammonia water to adjust the pH of a solution to 10 after ultrasonic magnetic stirring, reacting for 4 hours at 90 ℃, cooling a product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, adding styrene and aminated graphene, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 40 ℃, continuously adding ammonium persulfate, wherein the mass ratio of the styrene to the aminated graphene to the ammonium persulfate is 100:5:8, reacting for 55 hours at 95 ℃, cooling and then carrying out suction filtration on a product, and purifying the product by using a Soxhlet extractor to obtain a graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, foaming agent azodicarbonamide, thickening agent polyvinyl alcohol and flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:25:4:6, uniformly mixing, pouring into a mould for curing and pressing into a plate for forming, and curing at 120 ℃ for 3h to obtain the high-conductivity graphene modified polystyrene foam plate.
Comparative example 1
(1) Adding deionized water, graphene oxide and hexamethylene diamine into a reactor, wherein the mass ratio of the graphene oxide to the hexamethylene diamine is 100:425, performing ultrasonic magnetic stirring, adding ammonia water to adjust the pH value of the solution to 11, reacting at 90 ℃ for 5 hours, cooling the product, performing suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding N, N-dimethylformamide and deionized water in a volume ratio of 1:1 into a reactor, mixing, introducing nitrogen to remove oxygen after ultrasonic dispersion is uniform, raising the temperature to 40 ℃, continuously adding ammonium persulfate, wherein the mass ratio of styrene to aminated graphene to ammonium persulfate is 100:6:9.5, reacting for 60 hours at 95 ℃, cooling and carrying out suction filtration on a product, and purifying the product by using a Soxhlet extractor to obtain a graphene modified polystyrene emulsion;
(3) adding graphene modified polystyrene emulsion, foaming agent azodicarbonamide, thickening agent polyvinyl alcohol and flatting agent propylene oxide modified polydimethylsiloxane into a reactor, wherein the mass ratio of the graphene modified polystyrene emulsion to the foaming agent azodicarbonamide to the thickening agent polyvinyl alcohol to the flatting agent propylene oxide modified polydimethylsiloxane is 100:30:4.75:7.25, uniformly mixing, pouring into a mold for curing and pressing for molding, and curing at 120 ℃ for 4 hours to obtain the high-conductivity graphene modified polystyrene foam board.
The conductivity of the high-conductivity graphene-modified polystyrene foam board was measured using a SIN-TDS210 conductivity tester.
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 |
| Conductivity (S/m) | 66.7 | 75.0 | 83.3 | 106.8 | 102.5 | 71.2 |
The compressive strength and tensile strength of the highly conductive graphene-modified polystyrene foam board were tested using a ZB-HY3000 compressive strength tester.
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 |
| Compressive Strength (KPa) | 107.5 | 118.3 | 100.7 | 91.1 | 80.6 | 38.0 |
| Tensile strength (MPa) | 0.122 | 0.161 | 0.195 | 0.136 | 0.109 | 0.004 |
Claims (7)
1. A high-conductivity graphene modified polystyrene foam board is characterized in that: the preparation method of the high-conductivity graphene modified polystyrene foam board comprises the following steps:
(1) adding graphene oxide and hexamethylenediamine into a deionized water solvent, carrying out ultrasonic magnetic stirring, adding ammonia water to adjust the pH value of the solution to 9-10, carrying out reaction, cooling a product, carrying out suction filtration, repeatedly washing and drying to obtain aminated graphene;
(2) adding styrene and aminated graphene into a mixed solvent of N, N-dimethylformamide and deionized water in a volume ratio of 1:1, introducing nitrogen to remove oxygen after uniform ultrasonic dispersion, raising the temperature to 20-40 ℃, continuously adding ammonium persulfate to perform reaction, cooling a product, performing suction filtration, and purifying by using a Soxhlet extractor to obtain a graphene modified polystyrene emulsion;
(3) adding the graphene modified polystyrene emulsion, the foaming agent azodicarbonamide, the thickening agent polyvinyl alcohol and the flatting agent epoxypropane modified polydimethylsiloxane into a reactor, uniformly mixing, pouring into a mould for curing, and pressing into a plate for molding to obtain the high-conductivity graphene modified polystyrene foam plate.
2. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: the mass ratio of the graphene oxide to the hexamethylene diamine in the step (1) is 100: 300-400.
3. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: the reaction temperature in the step (1) is 70-90 ℃, and the reaction time is 2-4 h.
4. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: in the step (2), the mass ratio of the styrene to the aminated graphene to the ammonium persulfate is 100:0.5-5: 2-8.
5. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: the reaction temperature in the step (2) is 70-95 ℃, and the reaction time is 45-55 h.
6. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: the mass ratio of the graphene modified polystyrene emulsion, the foaming agent azodicarbonamide, the thickening agent polyvinyl alcohol and the flatting agent epoxypropane modified polydimethylsiloxane in the step (3) is 100:5-25:1-4: 1-6.
7. The graphene-modified polystyrene foam board with high conductivity as claimed in claim 1, wherein: the curing temperature in the step (3) is 100-120 ℃, and the curing time is 1-3 h.
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