Carbon material coating for adsorbing formaldehyde, preparation method and spraying process

Abstract

The invention belongs to the technical field of coatings, and discloses a carbon material coating for adsorbing formaldehyde, a preparation method and a spraying process. The carbon material coating for adsorbing formaldehyde comprises the following components in percentage by mass: 60%-65% of a bio-based binder, 1%-3% of a water-based dispersant, 1%-2.5% of carbon material powder, 0.1%-0.5% of a defoaming agent, 30%-36.5% of water and 1%-3% of a preservative. The carbon material coating obtained by combining the bio-based binder and the biomass carbon material is uniform in film formation after ultrasonic spraying and good in formaldehyde adsorption performance.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a carbon material coating for absorbing formaldehyde, a preparation method and a spraying process. Background Art

[0002] Harmful substances in furniture include formaldehyde, volatile organic compounds (VOC), soluble heavy metals and radioactive elements. Formaldehyde is the most important harmful substance in furniture, mainly coming from artificial boards such as plywood, blockboard, medium-density fiberboard and particleboard, as well as wallpaper, chemical fiber carpets, foam linings, paints and coatings.

[0003] Formaldehyde, also known as formic aldehyde, is an organic compound with the chemical formula CH2O, which is a first-class carcinogen. Formaldehyde will continuously irritate human skin, internal organs, respiratory mucosa, and cell tissues, affect the cross-linking of DNA single strands, and damage DNA self-repair. In mild cases, it can cause symptoms such as memory loss, menstrual disorders, sore throat, hoarseness, and coughing. In severe cases, it can induce serious diseases such as leukemia, nasopharyngeal cancer, and liver / lung cancer. If people live in such a new home or buy such furniture, the indoor formaldehyde content will greatly increase or even exceed the standard, which will endanger human health.

[0004] Biomass carbon material is a porous carbon-rich solid material prepared by thermochemical conversion of waste biomass materials in anoxic or anaerobic environment. The adsorption mechanism mainly includes three types: distribution, surface adsorption and pore interception. Surface adsorption is a nonlinear competitive adsorption process, which is the process of organic pollutants forming electrostatic effects or binding through hydrogen bonds, ionic bonds, π-π bond interactions, etc. on the effective adsorption sites on the surface of biomass carbon. Electrostatic adsorption is the most common physical adsorption, which is a weak interaction between organic pollutants and oxygen-containing functional groups on the surface of biomass carbon. Pore interception is another microscopic mechanism for biomass carbon to fix organic pollutants. The distribution and adsorption of organic pollutants inside the pores are also important manifestations of the adsorption capacity of biomass carbon. Although biomass carbon materials have been widely used in the field of formaldehyde adsorption materials, the dispersibility of biomass carbon materials in formaldehyde adsorbing coatings is not ideal. Therefore, further improvement is needed to obtain carbon material coatings with better dispersibility to meet market demand.

[0005] In addition, currently, most of the binders in formaldehyde-absorbing coatings are chemical binders. Most of these binders emit formaldehyde, and in carbon material coatings, there are disadvantages such as carbon material powder easily falling off the wood board, which affects the absorption of formaldehyde by the carbon material powder. Therefore, the improvement of binders in formaldehyde-absorbing coatings is still an aspect that needs to be solved urgently. Summary of the invention

[0006] The object of the present invention is to provide a carbon material coating for adsorbing formaldehyde, a preparation method and a spraying process. The carbon material coating forms a uniform film after spraying and has good formaldehyde adsorption performance.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] The present invention provides a carbon material coating for adsorbing formaldehyde. The coating comprises the following components by mass percentage: 60%-65% of a bio-based binder, 1%-3% of an aqueous dispersant, 1%-2.5% of a carbon material powder, 0.1%-0.5% of a defoaming agent, 30%-36.5% of water, and 1%-3% of a preservative.

[0009] In some embodiments, the bio-based binder is at least one of guar gum, tragacanth gum, and xanthan gum.

[0010] In some embodiments, the aqueous dispersant is at least one of sodium lignin sulfonate and SN-5040.

[0011] In some embodiments, the carbon material in the carbon material powder is biomass carbon, and the biomass carbon is at least one of bamboo carbon and coconut shell carbon.

[0012] In some embodiments, the defoaming agent is at least one of an organosilicon defoaming agent and a polyether-modified organosilicon defoaming agent.

[0013] In some embodiments, the preservative is a wood preservative.

[0014] The present invention also provides a method for preparing the carbon material coating, comprising the following process: weighing various ingredients according to the above proportions, mixing the bio-based binder, aqueous dispersant, defoamer, water and preservative for 2-3 minutes, then adding carbon material powder and continuing to stir for 3-5 minutes to obtain the carbon material coating.

[0015] The present invention also provides a spraying process of the carbon material coating, comprising: pouring the carbon material coating into a spray gun after ultrasonic treatment and spraying it multiple times, and drying it after each spraying.

[0016] In some embodiments, the ultrasonic process in the spraying process of the carbon material coating is to place the carbon material coating in an ultrasonic cell disruptor for treatment, the ultrasonic power is 500-550W, the ultrasonic operation mode is intermittent operation, and the cumulative ultrasonic time is 10-12min.

[0017] In some embodiments, the total amount of spraying in the spraying process of the carbon material coating is 0.0009-0.0025 kg / cm 2 ; The drying method is to use a hot air gun for drying.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0019] The present invention uses biochar, which is derived from widely available waste coconut shells and bamboo, to achieve high-value and low-carbon utilization. This approach not only extends the life of resources and saves energy, but also improves environmental quality, promotes the transformation from tail-end governance to full production chain management, and is a key link in the circular economy.

[0020] The bio-based binder used in the present invention is far less harmful to the human body than chemical binders, can truly achieve no secondary pollution to the air, and can improve the dispersibility of biomass carbon materials in the coating, so that the carbon material coating forms a uniform film after spraying, thereby improving the coating's ability to adsorb formaldehyde.

[0021] The present invention uses an ultrasonic cell disruptor to perform ultrasonic treatment on the coating before spraying, thereby further improving the dispersibility of the biomass carbon material in the coating and improving the effectiveness of spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a comparison chart of formaldehyde concentration between Example 1 of the present invention and the blank group at the same time;

[0023] Figure 2 This is a comparison chart of formaldehyde concentration between Example 2 of the present invention and the blank group at the same time;

[0024] Figure 3 The photographs are of the dispersion of the carbon material powder in Example 1 of the present invention and Comparative Example 1 before and after ultrasound. DETAILED DESCRIPTION

[0025] The present invention provides a carbon material coating for adsorbing formaldehyde. The coating comprises the following components by mass percentage: 60%-65% of a bio-based binder, 1%-3% of an aqueous dispersant, 1%-2.5% of a carbon material powder, 0.1%-0.5% of a defoaming agent, 30%-36.5% of water, and 1%-3% of a preservative.

[0026] Specifically, various ingredients are weighed according to the above proportions, at least one of guar gum, tragacanth gum and xanthan gum, at least one of sodium lignin sulfonate and SN-5040, at least one of an organosilicon defoamer and a polyether-modified organosilicon defoamer, water and a wood preservative are mixed and stirred for 2-3 minutes, and then at least one of bamboo carbon and coconut shell carbon is added and stirred for 3-5 minutes to obtain a carbon material coating.

[0027] It should be noted that the bamboo carbon powder used can be commercial bamboo carbon powder, such as the KMAZ3 model of Fujian Xinsen Carbon Industry Co., Ltd., and the coconut shell carbon powder used can be commercial coconut shell activated carbon with an iodine value of 1200, such as the 1200 iodine value coconut shell activated carbon 3-5mm model of Gongyi Zhengda Environmental Protection Materials Co., Ltd. The above are not limited to the listed manufacturers and models. The carbon material powder needs to be ground before use to ensure that the purchased commercial carbon material reaches a particle size of 200 to 400 meshes.

[0028] It should be noted that the bio-based binder is preferably guar gum, such as that produced by Henan Wanbang Chemical Technology Co., Ltd.; the sodium lignin sulfonate can be produced by Shanghai MacLean Biochemical Technology Co., Ltd., and SN-5040 can be the J1803 model of Shenzhen Jitian Chemical Co., Ltd.; the defoamer is preferably an organosilicon defoamer, which can be produced by Shenzhen Fakeda Surface Treatment Technology Co., Ltd.; the preservative is preferably a wood preservative, such as the JX-439 model of Jiexin Cleaning Agent Technology Co., Ltd. The above are not limited to the listed manufacturers and models.

[0029] It should be noted that, under the condition that the addition amount of other components is consistent, by mass percentage, when the addition amount of carbon material powder is 1%, the formaldehyde adsorption performance is good, the film layer is dark gray and the surface is smooth; when the addition amount is increased to 2%, the formaldehyde adsorption performance is better and more stable, the film layer is pure black and there are a small amount of particles on the surface, but the film layer is firm and not easy to fall off; when the addition amount is increased to 2.5%, the formaldehyde adsorption performance is further improved and the film layer is more stable, the film layer is black and relatively rough, and the film layer is firm and not easy to fall off; and when the addition amount reaches 3%, although the formaldehyde adsorption performance is further improved, the performance is unstable, the film layer is ink black and relatively rough, and it is easy to fall off. Therefore, the amount of carbon material powder used in this application is 1%-2.5% by mass percentage, not limited to 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, preferably 2%.

[0030] It should be noted that, under the condition that the addition amount of other components is consistent, by mass percentage, when the addition amount of bio-based binder is 50%, the cohesion effect between carbon material powders is poor, and the coating is not viscous enough after being sprayed through the spray gun, which affects the uniformity and adhesion of the film layer to a certain extent, and it is not easy to form a continuous film layer; when the proportion of bio-based binder is increased to 55%, the cohesion effect between carbon material powders is significantly improved, and the carbon material particles can be combined together without dispersion, but the film layer is not easy to form, and due to the low concentration, the continuity of the formed film layer is poor; when the proportion of bio-based binder is increased to 60%, the cohesion effect between carbon material powders is significantly improved, and the carbon material particles can be tightly combined together without dispersion. , and the coating can quickly form a continuous and uniform film layer after being sprayed out by a spray gun, and because of its moderate viscosity, the strength and stability of the film layer are ensured; when the proportion of bio-based binder is increased to 65%, the agglomeration effect between carbon material powders is better, the carbon material particles can be more closely combined together, there is no dispersion phenomenon, and the coating can quickly form a continuous and uniform film layer after being sprayed out by a spray gun, the viscosity is relatively large, and the film layer has certain strength and stability; however, when the proportion of bio-based binder is further increased to 70%, although the agglomeration effect between carbon material powders is further enhanced, the coating is slightly viscous at this time, resulting in poor fluidity of the solution in the spray gun, and it is not easy to spray out, which not only hinders the formation of the film layer, but also may cause the spray gun to be blocked, affecting the efficiency and quality of the film layer. Therefore, the amount of bio-based binder used in this application is 60%-65% by mass percentage, not limited to 60%, 61%, 62%, 63%, 64%, 65%, preferably 60%.

[0031] The carbon material coating of the present invention can be applied to multiple fields such as new energy, home furnishing panels, construction, anti-corrosion, aerospace, etc., preferably home furnishing panels.

[0032] The present invention also provides a spraying process of the carbon material coating, comprising: pouring the carbon material coating into a spray gun after ultrasonic treatment and spraying it multiple times, and performing drying after each spraying.

[0033] Specifically, first, the carbon material coating is placed in an ultrasonic cell crusher for processing. The purpose is to use ultrasound to disperse, crush and homogenize the particles in the coating, thereby improving the stability of the coating and the spraying effect. The ultrasonic cell crusher is set as follows: the power is adjusted to 500-550W, the ultrasonic operation mode is intermittent operation, and the cumulative ultrasonic time is 10-12min. The preferred power is 550W, the amplitude rod is selected as No. 12, and the engineering number is set to 5; the preferred operation mode is intermittent operation, that is, 5 seconds on, 3 seconds off, each processing time is 2 minutes, a total of 6 treatments, and the cumulative processing time is 12 minutes.

[0034] Then, pour the ultrasonic carbon material coating into the spray gun in small amounts and multiple times. This ensures that the amount of slurry in the spray gun is appropriate each time, avoiding clogging of the spray gun or uneven spraying. Next, spray multiple times to ensure the uniformity and density of the film layer. Among them, the single spraying amount is 0.0003-0.0005kg / cm 2 The number of spraying times is 3-5 times, and the total amount of spraying is 0.0009-0.0025kg / cm 2 After each spraying, the coating needs to be semi-dried with a hot air gun. The temperature of the hot air gun is set to 300℃ to ensure that the coating can dry quickly but will not crack or fall off due to over-drying. The purpose of semi-drying treatment is to prepare for the next spraying, and it helps to improve the adhesion and overall performance of the film. After the semi-drying treatment, the last spraying is carried out, and the coating is blown dry with a hot air gun. The temperature of the hot air gun is set to 300℃.

[0035] It should be noted that if two or more sides of the material need to be coated, the carbon material coating should be sprayed at a single spraying amount of 0.0003-0.0005kg / cm 2 , spray one side of the material first under the condition of 3-5 times of spraying, and then spray the other sides of the material under the same spraying conditions. The drying treatment for each side when spraying is the same as the drying treatment method described above. The overall spraying area is the sum of the areas of multiple sides of the material.

[0036] In the present invention, unless otherwise specified, the contents of all substances mentioned refer to their mass percentages.

[0037] In the present invention, the performance test method of the home wood panel coating for adsorbing formaldehyde is as follows:

[0038] Place the sprayed board in a closed air box, add formaldehyde solution on the internal heating plate, use a formaldehyde detector to detect the formaldehyde reduction content of the blank sample and the sprayed board, and compare with the blank sample. Among them, the blank sample is an acrylic board without coating, and the formaldehyde test result of the blank sample is used as the blank group.

[0039] In the present invention, the performance test of the home wood board coating in absorbing formaldehyde also adopts the drying dish method according to the national standard GB / T 17657-2013 to conduct professional detection of the formaldehyde release of the board.

[0040] The present invention is further described in detail in conjunction with specific embodiments. The following embodiments can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0041] Embodiment 1:

[0042] This embodiment provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0043] Bamboo carbon powder 2%, guar gum 60%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0044] According to the above proportions, the bio-based binder (guar gum), aqueous dispersant (SN-5040), silicone defoamer, preservative and water were mixed and stirred for 3 minutes, and then bamboo carbon powder with a particle size of 200 mesh was added and mixed and stirred for 3 minutes to obtain a carbon material coating.

[0045] The coating was treated with ultrasonic cell disruptor (Ningbo Xinzhi Biotechnology Co., Ltd.) and then sprayed evenly on the upper and lower surfaces of a 10 cm*10 cm sample (particle board produced by Jinpai Cabinet) using a spray gun (Meite Company, model W71). Each side was sprayed 5 times, and the total amount of spraying was 0.0025 kg / cm 2 , use a hot air gun to dry after each spraying.

[0046] Place the dried sprayed plate in a closed air box, add formaldehyde solution on the internal heating plate, use a formaldehyde detector to detect the formaldehyde reduction content of the blank sample and the sprayed plate, and compare them with the blank sample. The results are as follows Figure 1 As shown, after 150 minutes of testing time, the formaldehyde concentration dropped by 1.28 ppm.

[0047] Embodiment 2:

[0048] This embodiment provides a carbon material coating for adsorbing formaldehyde.

[0049] Compared with Example 1, the aqueous dispersant is sodium lignin sulfonate, and other conditions remain unchanged.

[0050] Place the dried sprayed plate in a closed air box, add formaldehyde solution on the internal heating plate, use a formaldehyde detector to detect the formaldehyde reduction content of the blank sample and the sprayed plate, and compare them with the blank sample. The results are as follows Figure 2 As shown, after 150 minutes of testing time, the formaldehyde concentration dropped by 1.07 ppm.

[0051] Embodiment 3:

[0052] This embodiment provides a carbon material coating for adsorbing formaldehyde.

[0053] Compared with Example 1, the size of the sample for paint spraying is 50cm*50cm, and other conditions remain unchanged.

[0054] The spray-coated board after drying was professionally tested for formaldehyde release according to the drying dish method of GB / T 17657-2013, and the formaldehyde test result was 0.06mg / L. The original aldehyde board belongs to F4 star board, and the formaldehyde emission is 0.3mg / L. Therefore, the formaldehyde emission of the spray-coated board treated with carbon material decreased by 0.24mg / L, which is close to the standard of E0 grade board. In addition, compared with the formaldehyde test time of 150min in Examples 1 and 2, Example 3 can better demonstrate the adsorption performance of the product on the formaldehyde gas emitted by the aldehyde board itself under a long-term state.

[0055] Embodiment 4:

[0056] This embodiment provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0057] Bamboo carbon powder 1%, guar gum 60%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0058] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0059] The spraying method of the carbon material coating and the sample used are the same as those in Example 1. After spraying, the film layer on the sample is dark gray-black and has a smooth surface, and has good formaldehyde adsorption performance.

[0060] Embodiment 5:

[0061] This embodiment provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0062] Bamboo carbon powder 2.5%, guar gum 60%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0063] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0064] The spraying method of the carbon material coating and the sample used are the same as those in Example 1. After spraying, the film layer on the sample is black and relatively rough, the film layer is relatively stable, firm and not easy to fall off, and the formaldehyde adsorption performance is further improved than that in Example 1.

[0065] Embodiment 6:

[0066] This embodiment provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0067] Bamboo carbon powder 2%, guar gum 65%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0068] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0069] The spraying method and the sample used for the carbon material coating are consistent with those in Example 1. The obtained carbon material coating has a relatively high viscosity, and after being sprayed out by the spray gun, the coating can quickly form a continuous and uniform film layer, and the film layer has a certain strength and stability.

[0070] Comparative Example 1:

[0071] This comparative example provides a carbon material coating for adsorbing formaldehyde.

[0072] Compared with Example 1, the binder is a water-based acrylic emulsion (Shenzhen Jitian Chemical Co., Ltd., model E0503), and other conditions remain unchanged.

[0073] Comparative Example 2:

[0074] This comparative example provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0075] Bamboo carbon powder 3%, guar gum 60%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0076] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0077] The spraying method of the carbon material coating and the sample used are consistent with those in Example 1.

[0078] Comparative Example 3:

[0079] This comparative example provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0080] Bamboo carbon powder 2%, guar gum 55%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0081] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0082] The spraying method of the carbon material coating and the sample used are consistent with those in Example 1.

[0083] Comparative Example 4:

[0084] This comparative example provides a carbon material coating for adsorbing formaldehyde, comprising the following components by mass percentage:

[0085] Bamboo carbon powder 2%, guar gum 70%, SN-50402%, silicone defoamer 0.3%, preservative 0.2%, deionized water to 100%.

[0086] Following the above-mentioned ratio and keeping other conditions completely consistent with Example 1, a carbon material coating is obtained.

[0087] The spraying method of the carbon material coating and the sample used are consistent with those in Example 1.

[0088] The comparison results of the use of the binder in Example 1 and Comparative Example 1 are as follows: Figure 3 As shown, from Figure 3 It can be clearly seen that, whether before or after ultrasound, compared with chemical binders (aqueous acrylic emulsions), bio-based binders (guar gum) have better dispersibility for carbon materials. This shows that in addition to being able to truly not bring secondary pollution to the air and play a bonding role, bio-based binders also play a certain dispersing role on carbon materials, and better dispersing effects make carbon material powders dispersed more evenly in the coating. Moreover, it is difficult to achieve uniform film formation of the coating by directly brushing the biomass carbon material coating. The present invention uses ultrasonic operation before spraying, which better solves the problem of poor dispersibility of carbon materials in coatings, especially using ultrasonic cell disruptors for ultrasonic operation, which can generate high-intensity shear force and shock waves, so as to more effectively disperse carbon material particles into liquid media, and compared with ordinary ultrasonic cleaning instruments, ultrasonic operation using ultrasonic cell disruptors can make the dispersion of carbon materials in coatings more uniform. In summary, the combination of the use of bio-based binders and the ultrasonic operation of the ultrasonic cell disruptor makes the carbon material more evenly dispersed in the coating, reduces the generation of internal defects in the coating, enhances the adhesion of the coating, and makes the film formation on the board more uniform and smooth after the coating is sprayed, avoiding uneven dispersion of the carbon material in the coating and falling off the wooden board, thereby affecting the absorption of formaldehyde.

[0089] In addition, when Example 1 is compared with Comparative Examples 2-4, only when the mass percentage of carbon material powder is controlled to be 1%-2.5% and the mass percentage of bio-based binder is controlled to be 60%-65% can the carbon material coating have good film quality and formaldehyde adsorption performance after spraying. The carbon material coating prepared by the present invention using coconut shell carbon as the carbon material or tragacanth gum or xanthan gum as the binder also shows good formaldehyde adsorption performance.

[0090] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A carbon material coating for adsorbing formaldehyde, characterized in that: The coating comprises the following components by mass percentage: 60%-65% of a bio-based binder, 1%-3% of an aqueous dispersant, 1%-2.5% of a carbon material powder, 0.1%-0.5% of a defoamer, 30%-36.5% of water, and 1%-3% of a preservative.

2. The carbon material coating according to claim 1, characterized in that: The bio-based binder is at least one of guar gum, tragacanth gum and xanthan gum.

3. The carbon material coating according to claim 1, characterized in that: The aqueous dispersant is at least one of sodium lignin sulfonate and SN-5040.

4. The carbon material coating according to claim 1, characterized in that: The carbon material in the carbon material powder is biomass carbon, and the biomass carbon is at least one of bamboo carbon and coconut shell carbon.

5. The carbon material coating according to claim 1, characterized in that: The defoamer is at least one of an organosilicon defoamer and a polyether-modified organosilicon defoamer.

6. The carbon material coating according to claim 1, characterized in that: The preservative is a wood preservative.

7. A method for preparing the carbon material coating according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: weighing various ingredients, mixing and stirring the bio-based binder, aqueous dispersant, defoamer, water and preservative for 2-3 minutes, and then adding carbon material powder and continuing to stir for 3-5 minutes to obtain the carbon material coating.

8. A spraying process for the carbon material coating according to any one of claims 1 to 6, characterized in that: The carbon material coating according to any one of claims 1 to 6 is poured into a spray gun after ultrasonic treatment and sprayed multiple times, and drying treatment is required after each spraying.

9. The spraying process of the carbon material coating according to claim 8, characterized in that: The ultrasonic process is to place the carbon material coating into an ultrasonic cell disruptor for treatment, the ultrasonic power is 500-550W, the ultrasonic operation mode is intermittent operation, and the cumulative ultrasonic time is 10-12 minutes.

10. The carbon material coating spraying process according to claim 8, characterized in that: The total amount of carbon material coating sprayed is 0.0009-0.0025kg / cm 2 ; The drying method is to use a hot air gun for drying.

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