An environmentally-friendly film-based super-coating for automobile polishing consumables and a preparation method thereof

Abstract

This invention discloses a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables and its preparation method, belonging to the field of supercoating coating technology. The preparation of this coating includes: ultrasonically dispersing silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micropowder, and lauroyl choline chloride in ethanol, followed by drying to obtain a core-shell structured multifunctional filler; dissolving itaconic acid-based bio-based epoxy resin, polybutyl acrylate, and bismaleimide in a mixed solvent of deionized water and ethanol, adding a non-ionic waterborne epoxy curing agent, and stirring to obtain a mixed resin; adding the core-shell filler, nano-zirconia, and a silane coupling agent to the mixed resin, dispersing, then adding tourmaline powder, nano-cellulose, and an antifoaming agent, and adjusting the fineness by roller pressing. This invention uses bio-based epoxy resin as the core, offering good environmental friendliness; through the synergistic effect of functional components such as the core-shell filler, it imparts high hardness, wear resistance, high temperature resistance, and strong adhesion to the coating, extending its service life, making it suitable for automotive polishing consumables.

Description

Technical Field

[0001] This invention belongs to the field of supercoating technology, and particularly relates to a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables and its preparation method. Background Technology

[0002] Automotive polishing consumables are indispensable key materials in the automotive manufacturing, repair, and surface treatment fields. They are mainly used for rust removal, paint removal, leveling, and polishing of automotive body parts and other workpieces. Their core function is to remove impurities and optimize surface roughness through the mechanical action of the coating on the workpiece surface, providing a base that meets the precision requirements for subsequent painting and assembly processes. Common automotive polishing consumables include sandpaper, sanding belts, polishing wheels, and polishing pads. Their performance directly affects the efficiency, processing accuracy, and final coating quality of automotive surface treatment. As the functional layer that directly participates in the polishing process, the surface coating of the consumables, its hardness, wear resistance, high temperature resistance, adhesion, and environmental friendliness are the core factors determining the overall performance of the consumables.

[0003] As the automotive industry moves towards high-end and green development, the performance requirements for automotive polishing consumables are becoming increasingly stringent. Traditional coatings are no longer sufficient to meet current demands, leading to the emergence of supercoatings. Supercoatings are high-performance coatings that achieve significant improvements over traditional coatings in terms of mechanical properties, environmental stability, and functional integration through nanotechnology, composite formulation design, and advanced manufacturing processes. Their typical characteristics include ultra-wear resistance, ultra-hardness, ultra-high temperature resistance, strong adhesion, and low environmental impact. In the field of automotive polishing consumables, the application of supercoatings can significantly improve the service life of consumables, polishing efficiency, and processing accuracy. Furthermore, supercoatings must also consider environmental friendliness, achieving a synergistic balance between high performance and low pollution.

[0004] However, existing supercoatings for automotive polishing consumables still suffer from several technical challenges: Firstly, most products are solvent-based coatings, relying on volatile organic solvents such as toluene and xylene, resulting in high VOC emissions. This not only pollutes the environment but also poses potential health hazards to operators, contradicting the trend of green industrial development. Secondly, traditional coatings often use single fillers as their functional components, leading to poor dispersibility and agglomeration. This makes it difficult to balance wear resistance and high-temperature resistance, causing the coating to peel, crack, and wear excessively under high-frequency, high-load polishing conditions, significantly shortening the lifespan of consumables and increasing production costs. Furthermore, existing coatings mostly use fossil-based resins as film-forming materials, resulting in strong resource dependence and a lack of effective application of bio-based materials, failing to meet current demands for sustainable development.

[0005] Given the shortcomings of the existing technologies, developing a thin-film-based supercoating environmentally friendly coating that combines excellent environmental performance with comprehensive performance has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a thin-film-based super-coating environmentally friendly coating that has both excellent environmental protection performance and comprehensive performance.

[0007] To achieve the above objectives, the following technical solution is adopted: This invention provides a thin-film-based super-coating environmentally friendly coating for automotive polishing consumables and its preparation method, the preparation method comprising the following steps:

[0008] S1. Silicon carbide nanowires and boron nitride nanosheets were uniformly dispersed in ethanol by ultrasonication. Polytetrafluoroethylene micro powder and lauroyl choline chloride were added, and the mixture was reacted at 50-60℃ and 300-500rpm for 24-30h. After drying, a core-shell structured multifunctional filler was obtained.

[0009] S2. Dissolve itaconic acid-based bio-based epoxy resin, polybutyl acrylate and bismaleimide in a mixed solvent of deionized water and ethanol, then add nonionic waterborne epoxy curing agent, and stir at 200-400 rpm for 10-20 min to obtain mixed resin.

[0010] S3. Add the core-shell structured multifunctional filler, nano-zirconia, and silane coupling agent KH-560 prepared in step S1 to the mixed resin prepared in step S2, and continue to disperse at 1000-1500 rpm for 30-60 min. Then add tourmaline powder, nano-cellulose, and defoamer, and feed the mixture into a roller press to adjust the fineness to below 100 μm to obtain the thin film-based super coating environmentally friendly coating.

[0011] Furthermore, the mass ratio of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micro powder and lauroyl choline chloride in step S1 is 24:(10~14):(6~10):(3~5).

[0012] Further, in step S2, the mass ratio of itaconic acid-based bio-based epoxy resin, polybutyl acrylate, bismaleimide, deionized water and ethanol is 30:(28~32):(8~12):(38~42):(43~47).

[0013] Furthermore, in step S2, the amount of the nonionic waterborne epoxy curing agent added is 45% to 55% of the weight of the itaconic acid-based bio-based epoxy resin.

[0014] Further, in step S3, the mass ratio of the core-shell multifunctional filler, nano-zirconia, silane coupling agent KH-560, mixed resin, tourmaline powder, nano-cellulose and defoamer is (42~46):(7~9):(1.8~2.2):(155~165):(6~8):(2.5~3.5):(0.4~0.6).

[0015] Furthermore, in step S1, the ultrasonic power is 800-1000W and the ultrasonic time is 30-60min.

[0016] Furthermore, in step S3, the roller gap of the roller press is 50-100μm, and the roller speed is 10-20m / min.

[0017] Furthermore, the nonionic waterborne epoxy curing agent is one or more of ethylenediamine, hexamethylenediamine, and triethylenetetramine.

[0018] Furthermore, the defoamer is at least one of ethylene carbonate, polyether-modified silicone oil, and polysiloxane.

[0019] The beneficial effects of this invention are:

[0020] The environmentally friendly film-based supercoating coating for automotive polishing consumables described in this invention combines excellent environmental performance with comprehensive performance. The coating uses itaconic acid-based bio-based epoxy resin as the core film-forming substance, combined with a mixture of deionized water, ethanol, and a non-ionic waterborne epoxy curing agent to construct a low-VOC waterborne system, reducing environmental pollutant emissions and meeting current environmental policies and green development requirements. Through core-shell structured multifunctional fillers, nano-zirconia, tourmaline powder, and other functional components, the coating is endowed with high hardness, excellent wear resistance, high-temperature resistance, and adhesion. Simultaneously, the reinforcing effect of nanocellulose and the leveling effect of defoamers ensure that the coating is not easily peeled off or cracked during polishing, significantly extending its service life. Furthermore, the introduction of tourmaline powder and bio-based components adds environmental benefits to the coating. The overall coating performance is suitable for the demanding usage scenarios of automotive polishing consumables, improving polishing efficiency and effectiveness while reducing adverse effects on the environment and operators.

[0021] This invention relates to a core-shell structured multifunctional filler prepared from silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene (PTFE) micropowder, and lauroyl choline chloride. This filler possesses outstanding characteristics such as excellent dispersibility, structural stability, and synergistic function. Silicon carbide nanowires, as the core component, provide core mechanical support and a wear-resistant, high-temperature-resistant foundation for the filler due to their high hardness, high strength, and excellent high-temperature resistance, significantly improving the coating's wear resistance and thermal stability. Boron nitride nanosheets, with their graphite-like layered structure and excellent lubricity and high-temperature resistance, complement the silicon carbide nanowires, further enhancing the filler's wear resistance and reducing the coating's surface friction coefficient, thus improving smoothness during polishing. PTFE micropowder, as… As a shell component, it possesses extremely low surface energy and excellent corrosion resistance and weather resistance. It not only improves the compatibility between the filler and the resin matrix, but also endows the coating with self-lubricating properties and anti-fouling ability, reducing the adhesion of impurities during the polishing process. Lauroyl choline chloride, as an ionic dispersant and interface modifier, promotes the uniform dispersion of silicon carbide nanowires and boron nitride nanosheets through the charge effect during ultrasonic dispersion, avoiding agglomeration. On the other hand, the polar groups in its molecular structure can enhance the binding force between the core layer and the shell layer, while improving the interfacial bonding strength between the filler and the resin matrix. This ensures the stable existence of the filler in the coating and fully utilizes the synergistic effect of each functional component, ultimately endowing the coating with balanced and excellent comprehensive performance. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0024] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels.

[0025] Example 1:

[0026] A thin-film-based supercoating environmentally friendly coating for automotive polishing consumables and its preparation method, the preparation method comprising the following steps:

[0027] S1. Silicon carbide nanowires and boron nitride nanosheets were uniformly dispersed in ethanol by ultrasonication, polytetrafluoroethylene micro powder and lauroyl choline chloride were added, and the mixture was reacted at 50℃ and 300rpm for 24h. After drying, a core-shell structured multifunctional filler was obtained.

[0028] S2. Dissolve itaconic acid-based bio-based epoxy resin, polybutyl acrylate and bismaleimide in a mixed solvent of deionized water and ethanol, then add nonionic waterborne epoxy curing agent, and stir at 200 rpm for 10 min to obtain mixed resin.

[0029] S3. Add the core-shell structured multifunctional filler, nano-zirconia, and silane coupling agent KH-560 prepared in step S1 to the mixed resin prepared in step S2, and continue to disperse at 1000 rpm for 30 min. Then add tourmaline powder, nano-cellulose, and defoamer, and feed it into a roller press to adjust the fineness to below 100 μm to obtain the film-based super coating environmentally friendly coating.

[0030] In step S1, the mass ratio of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micropowder, and lauroyl choline chloride is 24:10:6:3; in step S2, the mass ratio of itaconic acid-based bio-based epoxy resin, polybutyl acrylate, bismaleimide, deionized water, and ethanol is 30:28:8:38:43; in step S2, the amount of nonionic waterborne epoxy curing agent added is 45% of the weight of itaconic acid-based bio-based epoxy resin; in step S3... The mass ratio of the core-shell structured multifunctional filler, nano-zirconia, silane coupling agent KH-560, mixed resin, tourmaline powder, nano-cellulose, and defoamer is 42:7:1.8:155:6:2.5:0.4; the ultrasonic power in step S1 is 800W, and the ultrasonic time is 30min; the roller gap of the roller press in step S3 is 50μm, and the roller speed is 10m / min; the nonionic waterborne epoxy curing agent is ethylenediamine; and the defoamer is ethylene carbonate.

[0031] Example 2:

[0032] A thin-film-based supercoating environmentally friendly coating for automotive polishing consumables and its preparation method, the preparation method comprising the following steps:

[0033] S1. Silicon carbide nanowires and boron nitride nanosheets were uniformly dispersed in ethanol by ultrasonication, polytetrafluoroethylene micro powder and lauroyl choline chloride were added, and the mixture was reacted at 60℃ and 500rpm for 30h. After drying, a core-shell structured multifunctional filler was obtained.

[0034] S2. Dissolve itaconic acid-based bio-based epoxy resin, polybutyl acrylate and bismaleimide in a mixed solvent of deionized water and ethanol, then add nonionic waterborne epoxy curing agent, and stir at 400 rpm for 20 min to obtain mixed resin.

[0035] S3. Add the core-shell structured multifunctional filler, nano-zirconia, and silane coupling agent KH-560 prepared in step S1 to the mixed resin prepared in step S2, and continue to disperse at 1500 rpm for 60 min. Then add tourmaline powder, nano-cellulose, and defoamer, and feed it into a roller press to adjust the fineness to below 100 μm to obtain the film-based super coating environmentally friendly coating.

[0036] In step S1, the mass ratio of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micropowder, and lauroyl choline chloride is 24:14:10:5; in step S2, the mass ratio of itaconic acid-based bio-based epoxy resin, polybutyl acrylate, bismaleimide, deionized water, and ethanol is 30:32:12:42:47; in step S2, the amount of nonionic waterborne epoxy curing agent added is 55% of the weight of itaconic acid-based bio-based epoxy resin; in step S3, the core-shell structured multifunctional filler, nano-oxygen... The mass ratio of zirconium oxide, silane coupling agent KH-560, mixed resin, tourmaline powder, nanocellulose, and defoamer is 46:9:2.2:165:8:3.5:0.6; in step S1, the ultrasonic power is 1000W and the ultrasonic time is 60min; in step S3, the roller gap of the roller press is 100μm and the roller speed is 20m / min; the nonionic waterborne epoxy curing agent is ethylenediamine and hexamethylenediamine, with a mass ratio of 1:1; the defoamer is ethylene carbonate and polyether modified silicone oil, with a mass ratio of 1:1.

[0037] Example 3:

[0038] A thin-film-based supercoating environmentally friendly coating for automotive polishing consumables and its preparation method, the preparation method comprising the following steps:

[0039] S1. Silicon carbide nanowires and boron nitride nanosheets were uniformly dispersed in ethanol by ultrasonication, polytetrafluoroethylene micro powder and lauroyl choline chloride were added, and the mixture was reacted at 55℃ and 400rpm for 27h. After drying, a core-shell structured multifunctional filler was obtained.

[0040] S2. Dissolve itaconic acid-based bio-based epoxy resin, polybutyl acrylate and bismaleimide in a mixed solvent of deionized water and ethanol, then add nonionic waterborne epoxy curing agent, and stir at 300 rpm for 15 min to obtain mixed resin.

[0041] S3. Add the core-shell structured multifunctional filler, nano-zirconia, and silane coupling agent KH-560 prepared in step S1 to the mixed resin prepared in step S2, and continue to disperse at 1250 rpm for 45 min. Then add tourmaline powder, nano-cellulose, and defoamer, and feed it into a roller press to adjust the fineness to below 100 μm to obtain the film-based super coating environmentally friendly coating.

[0042] In step S1, the mass ratio of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micropowder, and lauroyl choline chloride is 24:12:8:4; in step S2, the mass ratio of itaconic acid-based bio-based epoxy resin, polybutyl acrylate, bismaleimide, deionized water, and ethanol is 30:30:10:40:45; in step S2, the amount of nonionic waterborne epoxy curing agent added is 50% of the weight of itaconic acid-based bio-based epoxy resin; in step S3, the core-shell structured multifunctional filler, nano-oxygen... The mass ratio of zirconium oxide, silane coupling agent KH-560, mixed resin, tourmaline powder, nanocellulose, and defoamer is 44:8:2.0:160:7:3.0:0.5; the ultrasonic power in step S1 is 900W, and the ultrasonic time is 45min; the roller gap of the roller press in step S3 is 75μm, and the roller speed is 15m / min; the nonionic waterborne epoxy curing agent is hexamethylenediamine and triethylenetetramine, with a mass ratio of 1:1; the defoamer is polyether-modified silicone oil and polysiloxane, with a mass ratio of 1:1.

[0043] Comparative Example 1:

[0044] In this comparative example, a toluene / xylene mixed solvent (mass ratio 1:1) was used instead of a deionized water-ethanol mixed solvent, and fossil-based bisphenol A epoxy resin was used instead of itaconic acid-based bio-based epoxy resin. The remaining components and their amounts remained unchanged.

[0045] Comparative Example 2:

[0046] In this comparative example, the preparation of the core-shell structure filler in step S1 was omitted, and equal masses of silicon carbide nanowires and boron nitride nanosheets were directly added, without polytetrafluoroethylene micropowder and lauroyl choline chloride.

[0047] Results Analysis

[0048] The following analysis was performed on the environmentally friendly coatings prepared in the various embodiments and comparative examples of the present invention:

[0049] The VOC content of the environmentally friendly coating was determined according to GB 18582-2020 "Limits of Hazardous Substances in Wall Coatings for Buildings"; the mass loss of the environmentally friendly coating was determined according to ASTM D4060 to evaluate its abrasion resistance; the pencil hardness of the environmentally friendly coating was determined according to GB / T 6739-2021 "Determination of Hardness of Paint Film by Pencil Method for Paints and Varnishes"; the adhesion of the environmentally friendly coating was determined according to GB / T 9286-1998 "Cross-cut Test of Paint Film for Paints and Varnishes"; the adhesion retention rate was tested after aging the environmentally friendly coating in a 200℃ oven for 24 hours to evaluate its high-temperature resistance; the environmentally friendly coating was applied to a substrate of 120-grit sandpaper, and the effective sanding area before complete wear of the coating was recorded in a sanding test on a car body steel plate. The results of the above tests are shown in Table 1.

[0050] Table 1 Comparison of Performance Test Results of Environmentally Friendly Coatings

[0051] Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 VOC content (g / L) 32.5 28.4 30.2 108.5 31.2 Mass loss (mg) 7.5 7.2 7.0 9.5 13.8 Pencil hardness 7H 7H 7H 6H 7H Adhesion Level 0 Level 0 Level 0 Level 1 Level 1 <![CDATA[Actual service life (m 2 )]]> 18.9 20.3 21.8 6.6 12.8

[0052] Table 1 shows that the thin-film-based supercoating environmentally friendly coatings for automotive polishing consumables prepared in Examples 1-3 of this invention are significantly superior to, or on par with, Comparative Examples 1 and 2 in terms of core performance indicators such as VOC content, wear resistance, adhesion, and actual service life. The VOC content of Examples 1-3 is all below 33 g / L (28.4~32.5 g / L), which falls into the category of low-VOC environmentally friendly coatings. This invention uses itaconic acid-based bio-based epoxy resin as the film-forming substance. Its molecular structure contains a large number of polar groups such as hydroxyl and carboxyl groups, which have excellent compatibility with mixed aqueous solvents and can achieve stable dispersion of the system without relying on highly volatile organic solvents. In contrast, the fossil-based bisphenol A epoxy resin of Comparative Example 1 is highly hydrophobic and requires the addition of solvents such as toluene and xylene to adjust the viscosity, resulting in increased VOC emissions. The mass loss in Examples 1-3 was less than 7.5 mg, indicating that the core-shell structured multifunctional filler of the present invention, through the synergistic design of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micropowder, and lauroyl choline chloride, achieved uniform dispersion of the nanofiller in the resin matrix, avoiding internal coating defects caused by the easy agglomeration of single fillers, and significantly improving wear resistance. The pencil hardness of Examples 1-3 and Comparative Example 2 all reached 7H, providing high hardness support for the environmentally friendly coating of the present invention. The pencil hardness of Examples 1-3 and Comparative Example 2 all reached 7H, while Comparative Example 1 reached 6H. This is because the itaconic acid-based bio-based epoxy resin of the present invention contains abundant polar groups in its molecular structure, which can form strong chemical bonds with the grinding consumable substrate; at the same time, the lauroyl choline chloride in the core-shell structured filler enhances the interfacial bonding force between the filler and the resin matrix through polar groups, and the fiber reinforcement effect of nanocellulose further improves the bonding strength between the coating and the substrate. The low-VOC water-based system of the embodiment does not sacrifice mechanical properties and has the advantages of high hardness, low wear and strong adhesion. Under the condition of high-frequency grinding of automotive body steel plates, the coating is not easy to peel off, crack or wear, thus significantly increasing the effective grinding area.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0054] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown are only one of the embodiments of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables, characterized in that: Includes the following steps: S1. Silicon carbide nanowires and boron nitride nanosheets were uniformly dispersed in ethanol by ultrasonication. Polytetrafluoroethylene micro powder and lauroyl choline chloride were added, and the mixture was reacted at 50-60℃ and 300-500rpm for 24-30h. After drying, a core-shell structured multifunctional filler was obtained. S2. Dissolve itaconic acid-based bio-based epoxy resin, polybutyl acrylate and bismaleimide in a mixed solvent of deionized water and ethanol, then add nonionic waterborne epoxy curing agent, and stir at 200-400 rpm for 10-20 min to obtain mixed resin. S3. Add the core-shell structured multifunctional filler, nano-zirconia, and silane coupling agent KH-560 prepared in step S1 to the mixed resin prepared in step S2, and continue to disperse at 1000-1500 rpm for 30-60 min. Then add tourmaline powder, nano-cellulose, and defoamer, and feed the mixture into a roller press to adjust the fineness to below 100 μm to obtain the thin film-based super coating environmentally friendly coating.

2. The method for preparing the thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 1, characterized in that: The mass ratio of silicon carbide nanowires, boron nitride nanosheets, polytetrafluoroethylene micro powder and lauroyl choline chloride in step S1 is 24:(10~14):(6~10):(3~5).

3. The method for preparing the thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 2, characterized in that: In step S2, the mass ratio of itaconic acid-based bio-based epoxy resin, polybutyl acrylate, bismaleimide, deionized water and ethanol is 30:(28~32):(8~12):(38~42):(43~47).

4. The method for preparing the thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 3, characterized in that: In step S2, the amount of nonionic waterborne epoxy curing agent added is 45% to 55% of the weight of itaconic acid-based bio-based epoxy resin.

5. The method for preparing the thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 4, characterized in that: In step S3, the mass ratio of the core-shell multifunctional filler, nano-zirconia, silane coupling agent KH-560, mixed resin, tourmaline powder, nano-cellulose and defoamer is (42~46):(7~9):(1.8~2.2):(155~165):(6~8):(2.5~3.5):(0.4~0.6).

6. The method for preparing the thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 5, characterized in that: In step S1, the ultrasonic power is 800-1000W and the ultrasonic time is 30-60min.

7. The method for preparing a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 6, characterized in that: In step S3, the roller gap of the roller press is 50-100μm, and the roller speed is 10-20m / min.

8. The method for preparing a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 7, characterized in that: The nonionic waterborne epoxy curing agent is one or more of ethylenediamine, hexamethylenediamine, and triethylenetetramine.

9. The method for preparing a thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to claim 8, characterized in that: The defoamer is at least one of ethylene carbonate, polyether-modified silicone oil, and polysiloxane.

10. A thin-film-based supercoating environmentally friendly coating for automotive polishing consumables, characterized in that: The coating is prepared by the method for preparing thin-film-based supercoating environmentally friendly coating for automotive polishing consumables according to any one of claims 1-9.