High heat dissipating lubricated aluminum sheet and method of making same

Abstract

The application relates to the technical field of heat-dissipating lubricated aluminum sheets, and discloses a high-heat-dissipating lubricated aluminum sheet and a preparation method thereof. The high-heat-dissipating lubricated aluminum sheet is prepared by uniformly coating a functional coating on the surface of an aluminum sheet, and the functional coating comprises the following raw materials in parts by weight: polyacrylate 45-55 parts, boron nitride nanosheet 6-10 parts, cellulose hydrogel 12-18 parts, polyethylene imine 3-6 parts, modified sodium alginate 5-10 parts and leveling agent 0.2-0.5 parts. The functional coating has excellent adhesion and heat conductivity, can quickly disperse the heat of a drill bit during drilling and does not crack, and has lubricity, can reduce the friction and abrasion of the drill bit, prolongs the service life of the drill bit, reduces the roughness of drilling, and improves the drilling quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat-dissipating lubricated aluminum sheet, in particular to a high-heat-dissipating lubricated aluminum sheet and a preparation method thereof. BACKGROUND

[0002] With the rapid development of electronic equipment, computers, intelligent automobiles and other fields, the development of PCB board as one of the key parts is increasingly valued. In recent years, circuit board design and manufacturing gradually tend to be multi-layered, laminated, functional, integrated, and light, thin, short, and small, and PCB drilling technology is also constantly progressing. Among them, the microporated, high-precision and high-quality, diversified development of PCB drilling technology is the current main trend.

[0003] In the PCB drilling process, a cover plate (aluminum sheet, coated aluminum sheet, etc.) is generally used to protect the PCB material and improve the drilling quality. Compared with ordinary aluminum sheet, the coated aluminum sheet can improve the drilling quality by utilizing the synergistic effect of the coating on the surface of the aluminum sheet and the aluminum sheet. The coating on the surface of the coated aluminum sheet at the present stage is a viscous resin. These resins have poor heat dissipation and poor lubricity, and cannot effectively dissipate the heat generated by the drill bit and reduce the friction between the drill bit and the workpiece, which leads to the influence of the drill bit on the drilling quality and hole position accuracy due to high temperature and friction damage. In addition, due to the smooth surface of the aluminum sheet, the coating will fall off from the surface of the aluminum sheet after a long time of use, greatly reducing the service life of the coated aluminum sheet. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a high-heat-dissipating lubricated aluminum sheet and a preparation method thereof.

[0005] The object of the present application can be achieved by the following technical solutions:

[0006] A high-heat-dissipating lubricated aluminum sheet, comprising a functional coating and an aluminum sheet; the functional coating is formed by uniformly coating a functional coating on the surface of the aluminum sheet;

[0007] The functional coating comprises the following raw materials by weight: polyacrylate 45-55 parts, boron nitride nanosheet 6-10 parts, cellulose hydrogel 12-18 parts, polyethyleneimine 3-6 parts, modified sodium alginate 5-10 parts, and leveling agent 0.2-0.5 parts;

[0008] The leveling agent is a polyether-modified organosiloxane;

[0009] The cellulose hydrogel is prepared by the following steps:

[0010] Step A1, the nano calcium carbonate, ethanol and sodium dodecyl sulfate were mixed and stirred uniformly, then KH-570 (silane coupling agent) and deionized water were added and stirred for 24 hours, centrifuged, washed, dried, and the precipitate was collected; then sodium dodecyl sulfate and sodium bicarbonate were stirred in deionized water for 30-60 minutes, then n-hexadecane, precipitate, acrylic acid and azobisisobutyronitrile were added and stirred uniformly, ultrasonic treatment was carried out under ice water bath for 10 minutes, heated to 60-80℃ under nitrogen condition, and stirred for 3-5 hours to obtain modified calcium carbonate;

[0011] Further, in the precipitation of step A1, the amount ratio of nano calcium carbonate, ethanol, sodium dodecyl sulfate, KH-570 and deionized water was 5g:40mL:0.02-0.05g:0.5-1.5mL:10mL;

[0012] Further, in the modified calcium carbonate of step A1, the amount ratio of sodium dodecyl sulfate, sodium bicarbonate, deionized water, n-hexadecane, precipitate, acrylic acid and azobisisobutyronitrile was 0.01-0.03g:0.005-0.01g:20mL:0.5-1mL:3-5g:2-4g:0.002-0.005g;

[0013] Step A2, sodium dodecyl sulfate, sodium chloride and deionized water were mixed and stirred uniformly, then modified cellulose and modified calcium carbonate were added and stirred for 1.5-2.5 hours, then potassium persulfate and N,N,N',N'-tetramethyl ethylenediamine were added and stirred for 20-30 minutes, then ultrasonic treatment was carried out for 5-10 minutes, and then the temperature was increased to 40-50℃ and the mixture was left to stand for 5-8 hours to obtain cellulose hydrogel;

[0014] Further, in step A2, the amount ratio of sodium dodecyl sulfate, sodium chloride, deionized water, modified cellulose, modified calcium carbonate, potassium persulfate and N,N,N',N'-tetramethyl ethylenediamine was 0.5-1.5g:0.3-0.9g:20-60mL:6-10g:0.1-0.2g:0.012-0.02g:0.0001g;

[0015] Further, in step A2, the modified cellulose was prepared by the following steps: nano cellulose was uniformly dispersed in N,N-dimethylformamide, then 6-bromo-1-hexene and sodium hydroxide were added, and the temperature was increased to 30-40℃ and the mixture was stirred for 18-24 hours, then centrifuged and purified to obtain modified cellulose;

[0016] Further, in the modified cellulose, the amount ratio of nano cellulose, N,N-dimethylformamide, 6-bromo-1-hexene and sodium hydroxide was 2-3g:100mL:3-5g:1.5-3g.

[0017] The modified sodium alginate was prepared by the following steps:

[0018] Step B1: Sodium alginate is added to deionized water and stirred in a 45°C water bath. EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide) and NHS (N-hydroxysuccinimide) are then added and stirred for 2-3 hours. Dopamine hydrochloride is then added and stirred for 8-12 hours. The mixture is allowed to stand for 24 hours, filtered, and dried to obtain modified sodium alginate.

[0019] Furthermore, in step B1, the usage ratio of sodium alginate, deionized water, EDC, NHS and dopamine hydrochloride is 5-10 g:100 mL:1.25-2.5 g:1-2 g:2-4 g.

[0020] A method for preparing a lubricating aluminum sheet with high heat dissipation performance comprises the following steps:

[0021] Step S1, weighing raw materials by weight, adding polyacrylate, boron nitride nanosheets, cellulose hydrogel, polyethyleneimine, modified sodium alginate and leveling agent into a stirrer and stirring evenly to obtain a functional coating;

[0022] Step S2: evenly apply the functional coating on the aluminum sheet to form a coating with a thickness of 0.2 mm, and dry it to obtain a lubricating aluminum sheet with high heat dissipation.

[0023] Beneficial effects of the present invention:

[0024] The high-heat dissipation lubricating aluminum sheet of the present invention is made by uniformly coating the surface of the aluminum sheet with a functional coating. The functional coating has excellent adhesion and thermal conductivity, can quickly disperse the heat of the drill bit during drilling without cracking, and also has lubricity, can reduce the friction and wear of the drill bit, increase the service life of the drill bit, reduce the roughness of the drill hole, and improve the drilling quality.

[0025] The functional coating in the present invention dissipates heat on the surface of the aluminum sheet, lubricates the drill bit, reduces the drill bit temperature, and improves the quality of the drill hole wall. The cellulose hydrogel introduced into the functional coating is first surface-treated with KH-570 on calcium carbonate to obtain a precipitate containing a double bond structure. Then, polyacrylic acid is synthesized on the surface of the precipitate using acrylic acid as a raw material and azobisisobutyronitrile as an initiator to obtain modified calcium carbonate. Then, 6-bromo-1-hexene is used to modify the cellulose. Finally, the double bonds introduced in the modified cellulose and the modified calcium carbonate are subjected to free radical polymerization to synthesize the cellulose hydrogel.

[0026] The cellulose hydrogel significantly improves the lubricity of the coating, because the hydrogel can form a lubricating film between the drill needle and the hydrogel, effectively reducing the friction coefficient, and the hydrogel can also replenish the water in the lubricating layer during the friction process through the water absorption and water retention capacity, ensuring the persistence of the lubricating effect, thereby reducing the friction and wear of the drill needle, prolonging the service life of the drill needle, reducing the frequency of replacing the drill needle, and reducing the production cost. In addition, the modified calcium carbonate contained in the hydrogel is uniformly distributed in the hydrogel network, forming new crosslinking points, which can enhance the mechanical properties of the hydrogel, and further enhance the mechanical properties of the coating, reduce the vibration and shaking of the drill needle during drilling, and further reduce the occurrence of drill needle breakage and other phenomena. At the same time, the hydrogel also plays the role of an adhesive in the matrix, can adsorb water in the matrix to form adhesion, enhance the bonding force between the coating and the aluminum sheet substrate, and improve the durability and service life of the coating.

[0027] The modified sodium alginate introduced into the functional coating is prepared by reacting sodium alginate and dopamine hydrochloride. The catechol structure introduced into the modified sodium alginate can interact with the hydroxyl groups on the surface of the aluminum sheet through hydrogen bonding, thereby realizing intermolecular adhesion and improving the adhesion between the functional coating and the aluminum sheet substrate, reducing cracking and peeling of the coating during drilling, and increasing the service life of the aluminum sheet. In addition, sodium alginate itself has a three-dimensional network structure, which can synergize with high molecular polymers such as polyacrylate after the coating is formed, and can support the drill needle during drilling, reduce deflection, and improve hole position accuracy. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Example 1: The modified cellulose is prepared by the following steps: uniformly dispersing 2g of nanocellulose in 100mL of N,N-dimethylformamide, then adding 3g of 6-bromo-1-hexene and 1.5g of sodium hydroxide, and stirring at 30℃ for 18h, centrifuging, and purifying to obtain the modified cellulose.

[0030] The cellulose hydrogel is prepared by the following steps:

[0031] Step A1, 5 g nano calcium carbonate, 40 mL ethanol and 0.02 g sodium dodecyl sulfate were mixed and stirred uniformly, then 0.5 mL KH-570 and 10 mL deionized water were added and stirred for 24 h, centrifuged, washed, dried, and the precipitate was collected; 0.01 g sodium dodecyl sulfate and 0.005 g sodium bicarbonate were stirred in 20 mL deionized water for 30 min, then 0.5 mL n-hexadecane, 3 g precipitate, 2 g acrylic acid and 0.002 g azobisisobutyronitrile were added and stirred uniformly, ultrasonic treatment was carried out under ice water bath for 10 min, heated to 60℃ under nitrogen condition, and stirred for 3 h to obtain modified calcium carbonate;

[0032] Step A2, 0.5 g sodium dodecyl sulfate, 0.3 g sodium chloride and 20 mL deionized water were mixed and stirred uniformly, then 6 g modified cellulose and 0.1 g modified calcium carbonate were added and stirred for 1.5 h, 0.012 g potassium persulfate and 0.0001 g N,N,N',N'-tetramethyl ethylenediamine were added and stirred for 20 min, then ultrasonic treatment was carried out for 5 min, and then the temperature was increased to 40℃ and stood for 5 h to obtain cellulose hydrogel.

[0033] Modified sodium alginate was prepared by the following steps:

[0034] 5 g sodium alginate was added to 100 mL deionized water and stirred uniformly under 45℃ water bath, then 1.25 g EDC and 1 g NHS were added and stirred for 2 h, 2 g dopamine hydrochloride was added and stirred for 8 h, stood for 24 h, filtered and dried to obtain modified sodium alginate.

[0035] Example 2: Modified cellulose was prepared by the following steps: 2.5 g nano cellulose was uniformly dispersed in 100 mL N,N-dimethylformamide, then 4 g 6-bromo-1-hexene and 2.2 g sodium hydroxide were added and the temperature was increased to 35℃ and stirred for 21 h, centrifuged and purified to obtain modified cellulose.

[0036] Cellulose hydrogel was prepared by the following steps:

[0037] Step A1, 5 g nano calcium carbonate, 40 mL ethanol and 0.02 g sodium dodecyl sulfate were mixed and stirred uniformly, then 0.5 mL KH-570 and 10 mL deionized water were added and stirred for 24 h, centrifuged, washed, dried, and the precipitate was collected; 0.01 g sodium dodecyl sulfate and 0.005 g sodium bicarbonate were stirred in 20 mL deionized water for 30 min, then 0.5 mL n-hexadecane, 3 g precipitate, 2 g acrylic acid and 0.002 g azobisisobutyronitrile were added and stirred uniformly, ultrasonic treatment was carried out under ice water bath for 10 min, heated to 60℃ under nitrogen condition, and stirred for 3 h to obtain modified calcium carbonate;

[0038] Step A2, 1 g of sodium dodecyl sulfate, 0.6 g of sodium chloride and 40 mL of deionized water were mixed and stirred uniformly, then 8 g of modified cellulose and 0.15 g of modified calcium carbonate were added and stirred for 2 h, then 0.016 g of potassium persulfate and 0.0001 g of N, N, N', N'-tetramethyl ethylenediamine were added and stirred for 25 min, then ultrasonic treatment was performed for 8 min, then the temperature was increased to 45 °C and left to stand for 6.5 h to obtain the cellulose hydrogel.

[0039] The modified sodium alginate was prepared by the following steps:

[0040] 7.5 g of sodium alginate was added to 100 mL of deionized water and stirred uniformly in a 45 °C water bath, then 1.9 g of EDC and 1.5 g of NHS were added and stirred for 2.5 h, then 3 g of dopamine hydrochloride was added and stirred for 10 h, then left to stand for 24 h, then filtered and dried to obtain the modified sodium alginate.

[0041] Example 3: The modified cellulose was prepared by the following steps: 3 g of nanocellulose was uniformly dispersed in 100 mL of N, N-dimethylformamide, then 5 g of 6-bromo-1-hexene and 3 g of sodium hydroxide were added and the temperature was increased to 40 °C for stirring for 24 h, then centrifuged and purified to obtain the modified cellulose.

[0042] The cellulose hydrogel was prepared by the following steps:

[0043] Step A1, 5 g of nanometer calcium carbonate, 40 mL of ethanol and 0.05 g of sodium dodecyl sulfate were mixed and stirred uniformly, then 1.5 mL of KH-570 and 10 mL of deionized water were added and stirred for 24 h, then centrifuged, washed, dried and the precipitate was collected; then 0.03 g of sodium dodecyl sulfate and 0.01 g of sodium bicarbonate were stirred in 20 mL of deionized water for 60 min, then 1 mL of n-hexadecane, 5 g of the precipitate, 4 g of acrylic acid and 0.005 g of azobisisobutyronitrile were mixed and stirred uniformly, then ultrasonic treatment was performed for 10 min in an ice water bath, then heated to 80 °C under nitrogen and stirred for 5 h to obtain the modified calcium carbonate.

[0044] Step A2, 1.5 g of sodium dodecyl sulfate, 0.9 g of sodium chloride and 60 mL of deionized water were mixed and stirred uniformly, then 10 g of modified cellulose and 0.2 g of modified calcium carbonate were added and stirred for 2.5 h, then 0.02 g of potassium persulfate and 0.0001 g of N, N, N', N'-tetramethyl ethylenediamine were added and stirred for 30 min, then ultrasonic treatment was performed for 10 min, then the temperature was increased to 50 °C and left to stand for 8 h to obtain the cellulose hydrogel.

[0045] The modified sodium alginate was prepared by the following steps:

[0046] 10g sodium alginate was added into 100mL deionized water and stirred uniformly under 45℃ water bath, then 2.5g EDC and 2g NHS were added and stirred for 3h, 4g dopamine hydrochloride was added and stirred for 12h, and then the mixture was left to stand for 24h, and then filtered and dried to obtain the modified sodium alginate.

[0047] Example 4: a preparation method of a high-heat-dissipation lubricated aluminum sheet comprises the following steps:

[0048] polyacrylate 45 parts, boron nitride nanosheet 6 parts, cellulose hydrogel prepared in Example 1 12 parts, polyethyleneimine 3 parts, modified sodium alginate prepared in Example 1 5 parts, and polyether modified organosiloxane 0.2 parts;

[0049] Step S1, the raw materials were weighed by weight parts, and the polyacrylate, boron nitride nanosheet, cellulose hydrogel prepared in Example 1, polyethyleneimine, modified sodium alginate prepared in Example 1 and polyether modified organosiloxane were added into a stirrer and stirred uniformly to obtain a functional coating;

[0050] Step S2, the functional coating was uniformly coated on the aluminum sheet to form a coating layer with a thickness of 0.2mm, and then the coating layer was dried to obtain the high-heat-dissipation lubricated aluminum sheet.

[0051] Example 5: a preparation method of a high-heat-dissipation lubricated aluminum sheet comprises the following steps:

[0052] polyacrylate 50 parts, boron nitride nanosheet 8 parts, cellulose hydrogel prepared in Example 2 15 parts, polyethyleneimine 4.5 parts, modified sodium alginate prepared in Example 2 7.5 parts, and polyether modified organosiloxane 0.3 parts;

[0053] Step S1, the raw materials were weighed by weight parts, and the polyacrylate, boron nitride nanosheet, cellulose hydrogel prepared in Example 2, polyethyleneimine, modified sodium alginate prepared in Example 2 and polyether modified organosiloxane were added into a stirrer and stirred uniformly to obtain a functional coating;

[0054] Step S2, the functional coating was uniformly coated on the aluminum sheet to form a coating layer with a thickness of 0.2mm, and then the coating layer was dried to obtain the high-heat-dissipation lubricated aluminum sheet.

[0055] Example 6: a preparation method of a high-heat-dissipation lubricated aluminum sheet comprises the following steps:

[0056] polyacrylate 55 parts, boron nitride nanosheet 10 parts, cellulose hydrogel prepared in Example 3 18 parts, polyethyleneimine 6 parts, modified sodium alginate prepared in Example 3 10 parts, and polyether modified organosiloxane 0.5 parts;

[0057] Step S1, weighing raw materials by weight, adding polyacrylate, boron nitride nanosheets, cellulose hydrogel prepared in Example 3, polyethyleneimine, modified sodium alginate prepared in Example 3, and polyether-modified organosiloxane into a stirrer and stirring uniformly to obtain a functional coating;

[0058] Step S2: evenly apply the functional coating on the aluminum sheet to form a coating with a thickness of 0.2 mm, and dry it to obtain a lubricating aluminum sheet with high heat dissipation.

[0059] Comparative Example 1: This comparative example is a lubricating aluminum sheet. The difference from Example 6 is that the cellulose hydrogel prepared in Example 3 is replaced by commercially available cellulose hydrogel, and all other aspects are the same.

[0060] Comparative Example 2: This comparative example is a lubricating aluminum sheet. The difference from Example 6 is that sodium alginate is used instead of the modified sodium alginate prepared in Example 3, and the rest are the same.

[0061] The lubricating aluminum sheets prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests:

[0062] Adhesion test: Use a grid marker to draw 10×10 1mm squares on the coating film. Apply 3M transparent tape to the gridded area and quickly pull it 180° to observe whether there is any coating peeling off on the lubricated aluminum sheet. The coating is graded from 0 to 5 based on the degree of peeling. No peeling is the best grade 0, while peeling with a peeling area of ​​less than 10% is grade 1. Shedding of not less than 10% and less than 30% is grade 2. Shedding of not less than 30% and less than 50% is grade 3. Shedding of not less than 50% and less than 70% is grade 4. Shedding of not less than 70% is grade 5.

[0063] Drilling test: The lubricated aluminum sheet sample was drilled with a 0.25mm diameter hole to test the hole wall roughness and hole position accuracy;

[0064] Thermal conductivity test: Tested according to ASTM E1530 coating thermal conductivity test standard;

[0065] The test results are shown in Table 1:

[0066] Table 1: Performance test results

[0067]

[0068] As can be seen from Table 1, the functional coating of the present invention has excellent adhesion and heat dissipation properties on the surface of the aluminum sheet. When the aluminum sheet is used for drilling holes in PCB boards, it can effectively improve the hole wall quality and hole position accuracy during PCB drilling, while also preventing drill bit breakage during the drilling process and reducing costs.

[0069] The above merely illustrates and describes the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as the modifications or supplements or replacements do not deviate from the scope defined by the concept of the present application, and should belong to the protection scope of the present application.

Claims

1. A high heat dissipation lubricating aluminum sheet, characterized in that: It comprises a functional coating and an aluminum sheet; the functional coating is formed by uniformly coating the functional coating on the surface of the aluminum sheet; The functional coating comprises the following raw materials in parts by weight: 45-55 parts of polyacrylate, 6-10 parts of boron nitride nanosheets, 12-18 parts of cellulose hydrogel, 3-6 parts of polyethyleneimine, 5-10 parts of modified sodium alginate, and 0.2-0.5 parts of a leveling agent; The cellulose hydrogel is prepared by the following steps: Step A1: Nano-calcium carbonate, ethanol, and sodium lauryl sulfate are mixed and stirred uniformly, and then KH-570 and deionized water are added and stirred for 24 hours, centrifuged, washed, dried, and the precipitate is collected; then, sodium lauryl sulfate and sodium bicarbonate are stirred in deionized water for 30-60 minutes, and then n-hexadecane, the precipitate, acrylic acid, and azobisisobutyronitrile are added and mixed and stirred uniformly, and ultrasonically treated in an ice-water bath for 10 minutes. Under nitrogen conditions, the mixture is heated to 60-80° C. and stirred for 3-5 hours to obtain modified calcium carbonate; Step A2: Sodium lauryl sulfate, sodium chloride, and deionized water are mixed and stirred uniformly, and then modified cellulose and modified calcium carbonate are added and stirred for 1.5-2.5 hours. Potassium persulfate and N,N,N',N'-tetramethylethylenediamine are added and stirred for 20-30 minutes. The mixture is ultrasonically treated for 5-10 minutes, and then heated to 40-50° C. and allowed to stand for 5-8 hours to obtain a cellulose hydrogel. The modified sodium alginate is prepared by the following steps: Add 5-10 g of sodium alginate to 100 mL of deionized water and stir evenly in a 45°C water bath. Then add 1.25-2.5 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 1-2 g of N-hydroxysuccinimide and stir for 2-3 hours. Then add 2-4 g of dopamine hydrochloride and stir to react for 8-12 hours. Let stand for 24 hours, filter, and dry to obtain modified sodium alginate.

2. The high heat dissipation lubricating aluminum sheet according to claim 1, characterized in that: In step A1, the ratio of nano-calcium carbonate, ethanol, sodium lauryl sulfate, KH-570 and deionized water is 5 g:40 mL:0.02-0.05 g:0.5-1.5 mL:10 mL.

3. The high heat dissipation lubricating aluminum sheet according to claim 1, characterized in that: In step A1, the ratio of sodium lauryl sulfate, sodium bicarbonate, deionized water, n-hexadecane, precipitate, acrylic acid and azobisisobutyronitrile in the modified calcium carbonate is 0.01-0.03 g: 0.005-0.01 g: 20 mL: 0.5-1 mL: 3-5 g: 2-4 g: 0.002-0.005 g.

4. The high heat dissipation lubricating aluminum sheet according to claim 1, characterized in that: In step A2, the usage ratio of sodium lauryl sulfate, sodium chloride, deionized water, modified cellulose, modified calcium carbonate, potassium persulfate and N,N,N',N'-tetramethylethylenediamine is 0.5-1.5 g: 0.3-0.9 g: 20-60 mL: 6-10 g: 0.1-0.2 g: 0.012-0.02 g: 0.0001 g.

5. The high heat dissipation lubricating aluminum sheet according to claim 1, characterized in that: The modified cellulose in step A2 is prepared by the following steps: nanocellulose is evenly dispersed in N,N-dimethylformamide, 6-bromo-1-hexene and sodium hydroxide are added, and the temperature is raised to 30-40° C. and stirred for reaction for 18-24 hours, followed by centrifugation and purification to obtain the modified cellulose.

6. The high heat dissipation lubricating aluminum sheet according to claim 5, characterized in that: The dosage ratio of nanocellulose, N,N-dimethylformamide, 6-bromo-1-hexene and sodium hydroxide in the modified cellulose is 2-3 g:100 mL:3-5 g:1.5-3 g.

7. The high heat dissipation lubricating aluminum sheet according to claim 1, characterized in that: The dosage ratio of sodium alginate, deionized water, 1-ethyl-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide and dopamine hydrochloride in the modified sodium alginate is 5-10 g:100 mL:1.25-2.5 g:1-2 g:2-4 g.

8. A method for preparing the lubricating aluminum sheet with high heat dissipation according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, weighing raw materials by weight, adding polyacrylate, boron nitride nanosheets, cellulose hydrogel, polyethyleneimine, modified sodium alginate and leveling agent into a stirrer and stirring evenly to obtain a functional coating; Step S2: evenly apply the functional coating on the aluminum sheet to form a coating with a thickness of 0.2 mm, and dry it to obtain a lubricating aluminum sheet with high heat dissipation.

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