CN117855669B - High noise reduction type PET composite material for computer battery and preparation method thereof - Google Patents
High noise reduction type PET composite material for computer battery and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 230000009467 reduction Effects 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 50
- 239000010439 graphite Substances 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 37
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- 238000003756 stirring Methods 0.000 claims abstract description 33
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims abstract description 18
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000004033 plastic Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 9
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- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 112
- 229910052757 nitrogen Inorganic materials 0.000 claims description 56
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 238000004321 preservation Methods 0.000 claims description 31
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 229920005862 polyol Polymers 0.000 claims description 21
- 150000003077 polyols Chemical class 0.000 claims description 21
- 229920005610 lignin Polymers 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 238000003763 carbonization Methods 0.000 claims description 17
- MSTZGVRUOMBULC-UHFFFAOYSA-N 2-amino-4-[2-(3-amino-4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl]phenol Chemical compound C1=C(O)C(N)=CC(C(C=2C=C(N)C(O)=CC=2)(C(F)(F)F)C(F)(F)F)=C1 MSTZGVRUOMBULC-UHFFFAOYSA-N 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 14
- 229920005575 poly(amic acid) Polymers 0.000 claims description 14
- 238000001291 vacuum drying Methods 0.000 claims description 14
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 13
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims description 11
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 11
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 claims description 9
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 9
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
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Abstract
The invention discloses a high noise reduction type PET composite material for a computer battery and a preparation method thereof. The preparation method of the high noise reduction type PET composite material for the computer battery comprises the following steps: step (1): mixing PET plastic, polyalcohol and hexamethylene diisocyanate together, stirring and mixing uniformly, then adding a curing agent, stirring continuously to obtain a PET mixture, and heating the PET mixture to a temperature above the melting point to enable the PET mixture to be in a molten state; step (2): and (3) placing the PET mixture in a molten state in an extruder, extruding into a film, uniformly attaching a modified heat-dissipating graphite layer on the surface of the PET mixture film, pressing and shaping, and cooling to obtain the high noise reduction type PET composite material for the computer battery. Firstly, preparing a foam structure with a noise reduction effect, and then adding modified heat dissipation graphene into a PET composite mixture, so that the temperature of a computer battery is reduced, and meanwhile, the generation of noise is further reduced.
Description
Technical Field
The invention belongs to the technical field of PET materials, and particularly relates to a high noise reduction type PET composite material for a computer battery and a preparation method thereof.
Background
With the rapid development of technology, computers have become an indispensable tool in our daily life and work. However, with the improvement of the performance and the wide application of the computer, the noise problem generated by the computer is also increasingly prominent. To solve this problem, researchers have come to pay attention to the application of the high noise reduction type PET composite material in the field of computer battery packaging. PET is a common plastic material with excellent mechanical property, heat resistance and chemical stability, and is widely applied in a plurality of fields, however, the traditional PET material has poor noise reduction performance and cannot meet the requirement of computer battery packaging. By introducing the material with excellent noise reduction performance and the preparation process, the noise reduction performance and the mechanical performance of the PET composite material can be remarkably improved, and the requirements of computer battery packaging are met.
Patent CN 102924878B discloses a PET composite material, and a preparation method and application thereof. The PET composite material comprises PET, a light shielding agent, a light stabilizer, a reinforcing agent, a nucleating agent, a coupling agent and the like, wherein the PET is modified by the light shielding agent and the stabilizing agent, so that the mechanical property and the high temperature resistance of the composite material are obviously improved; the coupling agent is used to greatly increase the compatibility between PET and each filler, greatly increase the mechanical property and high temperature resistance of the PET composite material, and is completely suitable for being used as a light guide plate material, but the noise reduction performance and the heat dissipation performance of the PET composite material produced by the process are still to be improved.
Disclosure of Invention
The invention aims to provide a high noise reduction type PET composite material for a computer battery and a preparation method thereof, which are used for solving the technical problems of poor noise reduction performance and poor heat dissipation performance of the composite PET material in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 34-42 parts of PET plastic, 1-2 parts of polyalcohol, 1.4-2.8 parts of hexamethylene diisocyanate and 1-2 parts of curing agent; the modified heat dissipation graphite layer is obtained by high-temperature carbonization treatment of polyamide acid and lignin.
Preferably, the preparation method of the polyol comprises the following steps:
q1: sequentially adding trimethylolpropane, phthalic anhydride and dimethylbenzene into a four-necked flask, introducing nitrogen, and raising the temperature of the system under the protection of the nitrogen to react;
Q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding diethylene glycol into the system, and heating for reaction under the protection of nitrogen;
Q3: and after the reaction is finished, reducing the temperature of the system, stopping introducing nitrogen, vacuumizing and dehydrating, stopping the reaction, and standing to obtain the polyol.
Preferably, in Q1, the purity of trimethylolpropane is 98%, the purity of phthalic anhydride is 99%, and the molar ratio of trimethylolpropane to phthalic anhydride is (0.9-1.1): (0.8-1.1), a four-neck flask is provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, after nitrogen is introduced for 5-7min, the temperature is raised to 140-150 ℃, and the reaction time is 4-6h; in the Q2, the mol ratio of diethylene glycol to trimethylolpropane is (1-1.2): (0.9-1.1), the temperature is 220-230 ℃, and the reaction time is 5-6h; in the Q3, the temperature is reduced to 120-160 ℃, the vacuum dehydration time is 1-2h, and the standing time is 2-4h.
Preferably, the preparation method of the modified heat dissipation graphite layer comprises the following steps:
S1: placing dimethylacetamide in a three-necked flask, adding bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding pyromellitic dianhydride after vacuum drying into the flask for reaction, stopping introducing nitrogen, continuing the reaction, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
s2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the glass sheet in a vacuum drying oven, gradually heating and preserving heat to obtain a composite film;
S3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating and preserving heat to obtain an oxide film; and transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, and heating and preserving heat to obtain the modified heat-dissipating graphite layer.
In the process, polyamide acid is selected as a base material, lignin is used as a filler, after the polyamide acid and the lignin are uniformly mixed and subjected to high-temperature carbonization treatment, an aromatic ring and a side chain structure in the lignin are decomposed to generate carbon and other small molecular compounds, the carbon materials can be further reacted through cracking, recombination and the like to form a modified heat dissipation graphite layer with excellent toughness and heat dissipation effect, and the preparation process of the modified heat dissipation graphite layer is as follows:
Lignin is a renewable aromatic chemical substance with rich content in nature and is a byproduct in the digestion process of the paper industry, most of lignin is burnt to provide heat energy for paper factories or is treated as waste, and high-value utilization is difficult to obtain. The graphite layer is formed by arranging carbon atoms in a layered structure, has excellent heat conduction performance, can effectively transfer heat from the inside of the battery to the outside, and improves the heat dissipation effect; the lignin interacts with polyimide in the compounding process, so that the toughness of the polyimide is improved, and strong covalent bonding exists between carbon atoms in a graphite layer, so that external force can be effectively absorbed and dispersed, and the toughness of the composite material is improved.
Preferably, in the S1, the mass ratio of dimethylacetamide, bis (3-amino-4-hydroxyphenyl) hexafluoropropane and pyromellitic dianhydride is (92-96): (12-16): (8-9), stirring at a low temperature of 4-7 ℃, reacting for 2-3h, stopping introducing nitrogen, and continuing the reaction for 8-10h.
Preferably, in the step S2, the ultrasonic time is 30-40min, and the gradual heating and heat preservation treatment is as follows: the temperature is kept at 80 ℃ for 2 hours, 120 ℃ for 1 hour, 150 ℃ for 1 hour, 200 ℃ for 1 hour and 235 ℃ for 1 hour.
Preferably, in the step S3, the temperature is 1300-1400 ℃, the heat preservation time is 4-5h, and after argon is introduced, the temperature is 2500-2900 ℃ and the heat preservation time is 6-8h.
Preferably, the preparation method of the high noise reduction type PET composite material for the computer battery comprises the following steps:
step (1): mixing PET plastic, polyalcohol and hexamethylene diisocyanate together, stirring and mixing uniformly, then adding a curing agent, stirring continuously to obtain a PET mixture, and heating the PET mixture to a temperature above the melting point to enable the PET mixture to be in a molten state;
Step (2): and (3) placing the PET mixture in a molten state in an extruder, extruding into a film, uniformly attaching a modified heat-dissipating graphite layer on the surface of the PET mixture film, pressing and shaping, and cooling to obtain the high noise reduction type PET composite material for the computer battery.
In the above process, a curing reaction occurs between the polyol and the hexamethylene diisocyanate, and in the curing process, hydroxyl groups in the polyol react with isocyanate groups in the hexamethylene diisocyanate to form a polymer.
The mass spectrum analysis results are as follows: m/z 950.56 (100.0%), 951.56 (52.3%), 952.56 (16.7%), 953.57 (3.7%), 951.55 (2.2%). The formed polymer is of a foam structure, so that noise generated in the using process of the computer battery is reduced, the foam has porosity, vibration and impact inside the battery can be effectively absorbed and buffered, the foam structure has good heat insulation performance, the heat transfer speed and heat loss inside the battery can be reduced, and the noise is further reduced.
Preferably, in the step (1), the stirring and mixing time is 30-50min, and the heating temperature is 270-280 ℃.
Preferably, in the step (2), the specification of the modified heat dissipation graphite layer is 2×2×0.1mm, the spacing between the patches is 2mm, and the applied pressure is 1-2MPa.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the invention, firstly, the polyol is prepared, and then, the polyol and the hexamethylene diisocyanate are subjected to a curing reaction to generate foam with a porous structure, so that noise generated in the use process of the computer battery is effectively reduced, the foam has good heat insulation performance, heat transfer in the battery can be reduced, the noise is reduced, and meanwhile, the prepared modified heat-dissipation graphite layer with a heat-dissipation effect can reduce the temperature of the computer battery, so that the thermal expansion and contraction phenomena in the battery are reduced, and the reduction of mechanical vibration and noise generated in the working process of the battery is facilitated.
2. The polyol and the hexamethylene diisocyanate prepared in the invention react to form a foam structure, and the foam structure can effectively absorb and buffer vibration and impact in the battery, reduce the speed and loss of heat transfer and effectively reduce noise generated in the use process of the computer battery.
3. According to the invention, polyimide and lignin are used as raw materials, a modified heat-dissipating graphite layer is obtained after high-temperature treatment, lignin is a renewable resource with abundant content in nature, and is widely available and low in price, so that the lignin becomes an ideal choice for high-value utilization, the formed modified heat-dissipating graphite layer is formed by arranging carbon atoms in a layered structure, has excellent heat conducting property, can effectively transfer heat from the inside of a battery to the outside, improves the heat-dissipating effect, and the lignin and polyimide interact and covalent bonding exists between the carbon atoms in the graphite layer, so that the modified heat-dissipating graphite layer has excellent toughness, can absorb and disperse external force, improve the shock resistance and impact resistance of a computer battery, and reduce noise generated by vibration and impact in the running process of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a high noise reduction type PET composite material for a computer battery, which is prepared by the invention.
Description of the drawings: 1. modified heat dissipation graphite layer, 2.PET mixture film.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment discloses a method for preparing polyol, which comprises the following steps:
Q1: sequentially adding 1.89g of trimethylolpropane with the purity of 98%, 1.15g of phthalic anhydride with the purity of 99% and dimethylbenzene into a four-neck flask provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, introducing nitrogen for 5min, raising the temperature of the system to 150 ℃, and reacting for 4h;
Q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding 0.99g of diethylene glycol into the system, and heating to 230 ℃ for reaction for 6 hours under the protection of nitrogen;
q3: after the reaction is finished, the temperature of the system is reduced to 140 ℃, the nitrogen is stopped being introduced, the reaction is stopped after the vacuum dehydration is carried out for 1h, and the polyol is obtained after the standing for 4 h.
The embodiment discloses a preparation method of a modified heat dissipation graphite layer, which comprises the following steps:
S1: putting 94g of dimethylacetamide into a three-necked flask, adding 14g of bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature of 6 ℃ for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding 8.5g of pyromellitic dianhydride after vacuum drying into the flask, reacting for 3 hours, stopping introducing nitrogen, continuing to react for 10 hours, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
S2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment for 30min to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the high-temperature-resistant glass sheet in a vacuum drying oven, gradually heating and preserving heat, wherein the gradual heating and preserving heat treatment is as follows: heat preservation at 80 ℃ for 2h, heat preservation at 120 ℃ for 1h, heat preservation at 150 ℃ for 1h, heat preservation at 200 ℃ for 1h, and heat preservation at 235 ℃ for 1h to obtain a composite film;
s3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating to 1300 ℃ for 4 hours to obtain an oxide film; transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, heating to 2800 ℃ and preserving heat for 6 hours to obtain the modified heat-dissipating graphite layer.
The embodiment discloses a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 38g of PET plastic, 1.5g of polyalcohol, 2.1g of hexamethylene diisocyanate and 1.5g of curing agent.
The embodiment discloses a preparation method of a high noise reduction type PET composite material for a computer battery, which comprises the following steps:
Step (1): mixing PET plastic, polyalcohol and hexamethylene diisocyanate together, stirring for 40min, adding a curing agent, stirring continuously to obtain a PET mixture, heating the PET mixture to a temperature above the melting point, and enabling the PET mixture to be in a molten state at a heating temperature of 280 ℃;
Step (2): placing the PET mixture in a molten state into an extruder, extruding into a film, referring to FIG. 1, uniformly attaching a modified heat-dissipating graphite layer with the specification of 2X 0.1mm to the surface of the PET mixture film, wherein 1 in FIG. 1 represents the modified heat-dissipating graphite layer with the specification of 2X 0.1mm, 2 represents the PET mixture film, applying pressure of 2MPa for shaping, and cooling to obtain the high noise reduction type PET composite material for the computer battery.
Example 2
The embodiment discloses a method for preparing polyol, which comprises the following steps:
Q1: sequentially adding 1.75g of trimethylolpropane with the purity of 98%, 1.02g of phthalic anhydride with the purity of 99% and dimethylbenzene into a four-neck flask provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, introducing nitrogen for 5min, raising the temperature of the system to 150 ℃, and reacting for 4h;
Q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding 0.95g of diethylene glycol into the system, and heating to 230 ℃ for reaction for 6 hours under the protection of nitrogen;
q3: after the reaction is finished, the temperature of the system is reduced to 140 ℃, the nitrogen is stopped being introduced, the reaction is stopped after the vacuum dehydration is carried out for 1h, and the polyol is obtained after the standing for 4 h.
The embodiment discloses a preparation method of a modified heat dissipation graphite layer, which comprises the following steps:
S1: putting 92g of dimethylacetamide into a three-necked flask, adding 12g of bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature of 6 ℃ for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding 8g of pyromellitic dianhydride after vacuum drying into the flask, reacting for 3 hours, stopping introducing nitrogen, continuing to react for 10 hours, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
S2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment for 30min to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the high-temperature-resistant glass sheet in a vacuum drying oven, gradually heating and preserving heat, wherein the gradual heating and preserving heat treatment is as follows: heat preservation at 80 ℃ for 2h, heat preservation at 120 ℃ for 1h, heat preservation at 150 ℃ for 1h, heat preservation at 200 ℃ for 1h, and heat preservation at 235 ℃ for 1h to obtain a composite film;
s3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating to 1300 ℃ for 4 hours to obtain an oxide film; transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, heating to 2800 ℃ and preserving heat for 6 hours to obtain the modified heat-dissipating graphite layer.
The embodiment discloses a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 34g of PET plastic, 1g of polyol, 1.4g of hexamethylene diisocyanate and 1.1g of curing agent.
The preparation method of the high noise reduction type PET composite material for the computer battery adopted in the embodiment is the same as that in the embodiment 1.
Example 3
The embodiment discloses a method for preparing polyol, which comprises the following steps:
Q1: sequentially adding 1.79g of trimethylolpropane with the purity of 98%, 1.33g of phthalic anhydride with the purity of 99% and dimethylbenzene into a four-neck flask provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, introducing nitrogen for 5min, raising the temperature of the system to 150 ℃, and reacting for 4h;
Q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding 1.05g of diethylene glycol into the system, and heating to 230 ℃ for reaction for 6 hours under the protection of nitrogen;
q3: after the reaction is finished, the temperature of the system is reduced to 140 ℃, the nitrogen is stopped being introduced, the reaction is stopped after the vacuum dehydration is carried out for 1h, and the polyol is obtained after the standing for 4 h.
The embodiment discloses a preparation method of a modified heat dissipation graphite layer, which comprises the following steps:
S1: putting 96g of dimethylacetamide into a three-necked flask, adding 13g of bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature of 6 ℃ for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding 9g of pyromellitic dianhydride after vacuum drying into the flask, reacting for 3 hours, stopping introducing nitrogen, continuing to react for 10 hours, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
S2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment for 30min to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the high-temperature-resistant glass sheet in a vacuum drying oven, gradually heating and preserving heat, wherein the gradual heating and preserving heat treatment is as follows: heat preservation at 80 ℃ for 2h, heat preservation at 120 ℃ for 1h, heat preservation at 150 ℃ for 1h, heat preservation at 200 ℃ for 1h, and heat preservation at 235 ℃ for 1h to obtain a composite film;
s3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating to 1300 ℃ for 4 hours to obtain an oxide film; transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, heating to 2800 ℃ and preserving heat for 6 hours to obtain the modified heat-dissipating graphite layer.
The embodiment discloses a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 42g of PET plastic, 2g of polyol, 2.8g of hexamethylene diisocyanate and 1.9g of curing agent.
The preparation method of the high noise reduction type PET composite material for the computer battery adopted in the embodiment is the same as that in the embodiment 1.
Example 4
The embodiment discloses a method for preparing polyol, which comprises the following steps:
Q1: sequentially adding 1.99g of trimethylolpropane with the purity of 98%, 1.09g of phthalic anhydride with the purity of 99% and dimethylbenzene into a four-neck flask provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, introducing nitrogen for 5min, raising the temperature of the system to 150 ℃, and reacting for 4h;
q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding 1.07g of diethylene glycol into the system, and heating to 230 ℃ for reaction for 6 hours under the protection of nitrogen;
q3: after the reaction is finished, the temperature of the system is reduced to 140 ℃, the nitrogen is stopped being introduced, the reaction is stopped after the vacuum dehydration is carried out for 1h, and the polyol is obtained after the standing for 4 h.
The embodiment discloses a preparation method of a modified heat dissipation graphite layer, which comprises the following steps:
s1: placing 93g of dimethylacetamide into a three-necked flask, adding 16g of bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature of 6 ℃ for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding 8.7g of pyromellitic dianhydride after vacuum drying into the flask, reacting for 3 hours, stopping introducing nitrogen, continuing to react for 10 hours, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
S2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment for 30min to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the high-temperature-resistant glass sheet in a vacuum drying oven, gradually heating and preserving heat, wherein the gradual heating and preserving heat treatment is as follows: heat preservation at 80 ℃ for 2h, heat preservation at 120 ℃ for 1h, heat preservation at 150 ℃ for 1h, heat preservation at 200 ℃ for 1h, and heat preservation at 235 ℃ for 1h to obtain a composite film;
s3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating to 1300 ℃ for 4 hours to obtain an oxide film; transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, heating to 2800 ℃ and preserving heat for 6 hours to obtain the modified heat-dissipating graphite layer.
The embodiment discloses a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 39g of PET plastic, 1.3g of polyalcohol, 1.9g of hexamethylene diisocyanate and 1.7g of curing agent.
The preparation method of the high noise reduction type PET composite material for the computer battery adopted in the embodiment is the same as that in the embodiment 1.
Example 5
The embodiment discloses a method for preparing polyol, which comprises the following steps:
Q1: 2.07g of trimethylolpropane with the purity of 98 percent, 1.29g of phthalic anhydride with the purity of 99 percent and dimethylbenzene are sequentially added into a four-neck flask provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water knockout drum, nitrogen is introduced, after the nitrogen is introduced for 5min, the temperature of the system is raised to 150 ℃ and the reaction is carried out for 4h;
q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding 0.90g of diethylene glycol into the system, and heating to 230 ℃ for reaction for 6 hours under the protection of nitrogen;
q3: after the reaction is finished, the temperature of the system is reduced to 140 ℃, the nitrogen is stopped being introduced, the reaction is stopped after the vacuum dehydration is carried out for 1h, and the polyol is obtained after the standing for 4 h.
The embodiment discloses a preparation method of a modified heat dissipation graphite layer, which comprises the following steps:
S1: placing 95g of dimethylacetamide into a three-necked flask, adding 15g of bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature of 6 ℃ for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding 8.3g of pyromellitic dianhydride after vacuum drying into the flask, reacting for 3 hours, stopping introducing nitrogen, continuing to react for 10 hours, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
S2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment for 30min to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the high-temperature-resistant glass sheet in a vacuum drying oven, gradually heating and preserving heat, wherein the gradual heating and preserving heat treatment is as follows: heat preservation at 80 ℃ for 2h, heat preservation at 120 ℃ for 1h, heat preservation at 150 ℃ for 1h, heat preservation at 200 ℃ for 1h, and heat preservation at 235 ℃ for 1h to obtain a composite film;
s3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating to 1300 ℃ for 4 hours to obtain an oxide film; transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, heating to 2800 ℃ and preserving heat for 6 hours to obtain the modified heat-dissipating graphite layer.
The embodiment discloses a high noise reduction type PET composite material for a computer battery, which consists of a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film consists of 41g of PET plastic, 1.7g of polyalcohol, 2.4g of hexamethylene diisocyanate and 1.3g of curing agent.
The preparation method of the high noise reduction type PET composite material for the computer battery adopted in the embodiment is the same as that in the embodiment 1.
Comparative example 1
Comparative example 1 in comparison with example 1, comparative example 1 was prepared without adding a modified heat-dissipating graphite layer, and the other conditions were unchanged.
Comparative example 2
Comparative example 2 in comparison with example 1, comparative example 2 was prepared without addition of hexamethylene diisocyanate, and the other conditions were unchanged.
Experimental example
The performance of the high noise reduction type PET composite material for computer batteries prepared in examples 1 to 5 and comparative examples 1 to 2 was tested.
1. Noise reduction performance test
The thickness of the obtained untreated PET plastic was the same as that of the PET composite material in the examples, the treated and untreated films were uniformly wrapped on the battery surface of the computer, the noise level of the computer was measured by a noise detector (Shanghai Liyin technology Co., ltd.) during the operation, the computer operation program was kept the same during the measurement, and the calculation results were shown in Table 1 according to the noise reduction ratio = [ (untreated-treated)/untreated ]. Times.100%:
TABLE 1
| Project | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 |
| Noise reduction rate/% | 79.4 | 76.5 | 78.2 | 77.1 | 77.6 | 65.8 | 53.4 |
As can be seen from the test results in Table 1, the high noise reduction type PET composite materials for computer batteries prepared in examples 1 to 5 of the present invention have excellent noise reduction rate. As can be seen from comparison of comparative example 1 and examples 1 to 5, the addition of the modified heat-dissipating graphite layer can improve the noise reduction rate of the high noise reduction type PET composite material for computer batteries; as can be seen from comparison of comparative example 2 and examples 1-5, the addition of hexamethylene diisocyanate effectively increases the noise reduction rate of the high noise reduction type PET composite material for computer batteries.
2. Test of heat dissipation performance
The thickness of the obtained untreated PET plastic was the same as that of the PET composite material in the example, the untreated PET plastic and the treated PET plastic were uniformly wrapped on the battery surface of the computer, the noise of the computer was measured by a temperature sensor, the computer was kept in the same operation procedure during the measurement, and the calculation result was shown in Table 1 according to the heat dissipation rate = [ (untreated-treated)/untreated ]. Times.100%:
TABLE 2
| Project | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 |
| Heat dissipation rate/% | 84.6 | 83.2 | 82.9 | 81.1 | 80.9 | 56.7 | 64.9 |
As shown in the test results of Table 2, the high noise reduction type PET composite material for computer battery prepared in examples 1 to 5 of the present invention has excellent heat dissipation rate. As can be seen from comparison of comparative example 1 and examples 1-5, the addition of the modified heat dissipation graphite layer can effectively improve the heat dissipation rate of the high noise reduction type PET composite material for the computer battery; as can be seen from comparison of comparative example 2 and examples 1-5, the addition of hexamethylene diisocyanate can increase the heat dissipation rate of the high noise reduction type PET composite material for computer batteries.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. The high noise reduction type PET composite material for the computer battery is characterized by comprising a PET mixture film and a modified heat dissipation graphite layer, wherein the PET mixture film comprises 34-42 parts of PET plastic, 1-2 parts of polyalcohol, 1.4-2.8 parts of hexamethylene diisocyanate and 1-2 parts of curing agent; the modified heat dissipation graphite layer is obtained by high-temperature carbonization treatment of polyamide acid and lignin; wherein, the preparation method of the polyol comprises the following steps:
q1: sequentially adding trimethylolpropane, phthalic anhydride and dimethylbenzene into a four-necked flask, introducing nitrogen, and raising the temperature of the system under the protection of the nitrogen to react;
Q2: after the reaction is finished, maintaining the temperature of the system unchanged, adding diethylene glycol into the system, and heating for reaction under the protection of nitrogen;
q3: after the reaction is finished, reducing the temperature of the system, stopping introducing nitrogen, vacuumizing and dehydrating, stopping the reaction, and standing to obtain polyol;
the preparation method of the modified heat dissipation graphite layer comprises the following steps:
S1: placing dimethylacetamide in a three-necked flask, adding bis (3-amino-4-hydroxyphenyl) hexafluoropropane into the three-necked flask, stirring at a low temperature for dissolution, introducing nitrogen after the bis (3-amino-4-hydroxyphenyl) hexafluoropropane is completely dissolved, simultaneously adding pyromellitic dianhydride after vacuum drying into the flask for reaction, stopping introducing nitrogen, continuing the reaction, and stopping stirring after the reaction is finished to obtain a polyamic acid solution;
s2: placing lignin in a polyamic acid solution, removing bubbles by an ultrasonic cleaner, performing ultrasonic treatment to ensure uniform mixing, then coating the mixed solution on a high-temperature-resistant glass sheet by a tape casting method, placing the glass sheet in a vacuum drying oven, gradually heating and preserving heat to obtain a composite film;
S3: fixing the composite film by using a graphite clamping piece, introducing nitrogen protection into a continuous carbonization furnace for carbonization, and heating and preserving heat to obtain an oxide film; and transferring the carbonized film into a horizontal graphitizing furnace, introducing argon, and heating and preserving heat to obtain the modified heat-dissipating graphite layer.
2. The high noise reduction type PET composite material for a computer battery according to claim 1, wherein in Q1, the purity of trimethylolpropane is 98%, the purity of phthalic anhydride is 99%, and the molar ratio of trimethylolpropane to phthalic anhydride is (0.9-1.1): (0.8-1.1), a four-neck flask is provided with a nitrogen inlet pipe, a thermometer, a stirring device, a condensing reflux pipe and a water separator, after nitrogen is introduced for 5-7min, the temperature is raised to 140-150 ℃, and the reaction time is 4-6h; in the Q2, the mol ratio of diethylene glycol to trimethylolpropane is (1-1.2): (0.9-1.1), the temperature is 220-230 ℃, and the reaction time is 5-6h; in the Q3, the temperature is reduced to 120-160 ℃, the vacuum dehydration time is 1-2h, and the standing time is 2-4h.
3. The high noise reduction type PET composite material for a computer battery according to claim 1, wherein in S1, the mass ratio of dimethylacetamide, bis (3-amino-4-hydroxyphenyl) hexafluoropropane and pyromellitic dianhydride is (92-96): (12-16): (8-9), stirring at a low temperature of 4-7 ℃, reacting for 2-3h, stopping introducing nitrogen, and continuing the reaction for 8-10h.
4. The high noise reduction type PET composite material for the computer battery according to claim 1, wherein in the S2, the ultrasonic time is 30-40min, and the gradual heating and heat preservation treatment is as follows: the temperature is kept at 80 ℃ for 2 hours, 120 ℃ for 1 hour, 150 ℃ for 1 hour, 200 ℃ for 1 hour and 235 ℃ for 1 hour.
5. The high noise reduction type PET composite material for a computer battery according to claim 1, wherein in S3, the temperature rise is 1300-1400 ℃, the heat preservation time is 4-5h, and after argon is introduced, the temperature rise is 2500-2900 ℃, and the heat preservation time is 6-8h.
6. A method for preparing the high noise reduction type PET composite material for computer batteries according to any one of claims 1 to 5, comprising the steps of:
Step (1): mixing PET plastic, polyalcohol and hexamethylene diisocyanate together, stirring and mixing uniformly, then adding a curing agent, stirring continuously to obtain a PET mixture, and heating the PET mixture to a temperature above the melting point to enable the PET mixture to be in a molten state;
step (2): and (3) placing the PET mixture in a molten state in an extruder, extruding into a film, uniformly attaching a modified heat-dissipating graphite layer on the surface of the PET mixture film, pressing and shaping, and cooling to obtain the high noise reduction type PET composite material for the computer battery.
7. The method for preparing a high noise reduction type PET composite material for a computer battery according to claim 6, wherein in the step (1), the stirring and mixing time is 30-50min, and the heating temperature is 270-280 ℃.
8. The method for preparing a high noise reduction type PET composite material for a computer battery according to claim 6, wherein in the step (2), the specification of the modified heat dissipation graphite layer is 2 x 0.1mm, the spacing between the patches is 2mm, and the applied pressure is 1 to 2MPa.
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