Preparation method of water-based environment-friendly polyethylene coating

Abstract

The invention relates to the technical field of environment-friendly coatings, and discloses a preparation method of a water-based environment-friendly polyethylene coating, which comprises the following steps: preparing raw materials; the composite nano filler is treated; adding the treated composite nanofiller into a water-based acrylic resin emulsion, and uniformly stirring to obtain a mixed solution; adding a defoaming agent, an organic silicon monomer, an initiator and a water-based toughening agent into the mixed solution, continuously stirring, and then carrying out polymerization reaction, so as to obtain the water-based environment-friendly polyethylene coating after the reaction is finished, the water-based acrylic resin emulsion is used as a main film-forming substance, has good film-forming property and water resistance, can form a continuous and compact coating film on the surface of polyethylene, and provides basic protection and decoration functions for a coating. The introduced composite nano filler is composed of nano silicon carbide and nano montmorillonite according to a specific ratio, and the nano silicon carbide has high hardness and can enhance the hardness and wear resistance of the coating.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly coatings technology, specifically a method for preparing a water-based environmentally friendly polyethylene coating. Background Technology

[0002] Water-based coatings use water as a diluent and offer advantages such as environmental friendliness, safety, and zero pollution. In recent years, water-based coatings have received widespread attention and application in the coatings industry. They can effectively reduce the emission of volatile organic compounds (VOCs), thus mitigating harm to the environment and human health.

[0003] Polyethylene (PE) is a common thermoplastic with excellent chemical stability, corrosion resistance, electrical insulation, and processing properties, and is widely used in packaging, construction, electronics, and many other fields. However, the low surface polarity and low surface energy of polyethylene result in poor adhesion of ordinary coatings to its surface, making it difficult to meet practical application requirements.

[0004] Coatings applied to the surface of polyethylene primarily enhance the appearance, corrosion resistance, and abrasion resistance of polyethylene products, thereby expanding the application range of polyethylene. For example, in the food packaging industry, coatings can prevent polyethylene packaging materials from being corroded by their contents while improving the packaging's aesthetics; in the construction industry, coated polyethylene materials can enhance their weather resistance and decorative effect.

[0005] Existing solvent-based coatings have many drawbacks when used on polyethylene surfaces. On the one hand, solvent-based coatings contain a large amount of organic solvents, which will release a large amount of VOCs during use, polluting the environment, harming human health, and posing flammable and explosive safety hazards. On the other hand, solvent-based coatings have limited adhesion to polyethylene surfaces, and the coating is prone to peeling and flaking, affecting the protective effect and service life of the coating.

[0006] This invention effectively overcomes the aforementioned shortcomings by using water-based acrylic resin emulsion as the main film-forming substance, combined with specially treated composite nanofillers, and adding various functional additives such as defoamers, organosilicon monomers, initiators, and water-based toughening agents. The water-based acrylic resin emulsion possesses excellent film-forming properties and water resistance, enabling it to form a continuous and dense coating on the polyethylene surface. The treated composite nanofillers enhance the coating's hardness, abrasion resistance, and corrosion resistance. The synergistic effect of the functional additives improves the coating's adhesion to the polyethylene surface, enhances its flexibility and impact resistance, and ensures the coating's environmental friendliness. Summary of the Invention

[0007] To address the problems in the prior art, this invention provides a method for preparing a water-based environmentally friendly polyethylene coating.

[0008] The technical solution adopted by this invention to solve its technical problem is: a method for preparing a water-based environmentally friendly polyethylene coating, comprising the following steps: Prepare raw materials: by weight, prepare 62-78 parts of water-based acrylic resin emulsion, 15-18 parts of composite nanofiller, 0.2-0.3 parts of defoamer, 6-7 parts of organosilicon monomer, 0.2-0.3 parts of initiator, and 1.2-1.5 parts of water-based toughening agent; The composite nanofiller is composed of nano-silicon carbide and nano-montmorillonite in a mass ratio of 1:(5-8); The composite nanofiller was treated as follows: the composite nanofiller was dispersed in an ethanol-water mixed solution, wherein the volume ratio of ethanol to water was 1:(2-3), the mass concentration of the composite nanofiller was 7-7.8 g / L, and ultrasonically dispersed for 30-40 min; then, bis(octadecyldimethylammonium chloride) was added, wherein the mass ratio of bis(octadecyldimethylammonium chloride) to the composite nanofiller was (0.1-0.16):1, and the mixture was stirred at 55-58℃ for 2-3 h. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller. The treated composite nanofiller was added to the aqueous acrylic resin emulsion and stirred evenly to obtain a mixture. Add defoamer, organosilicon monomer, initiator and water-based toughening agent to the mixture, continue stirring, and then carry out polymerization reaction at 60-65℃ for 3-4 hours. After the reaction is completed, water-based environmentally friendly polyethylene coating is obtained. As a further technical solution, the solid content of the waterborne acrylic resin emulsion is 40-45%, and the glass transition temperature is 8℃-12℃. As a further technical solution, the particle size of the nano-silicon carbide is 10-30nm, and the thickness of the nano-montmorillonite sheets is 1-2nm. As a further technical solution, the defoamer is an organosilicone defoamer. As a further technical solution, the organosilicon monomer is γ-methacryloxypropyltrimethoxysilane, and before adding the organosilicon monomer, it is pre-reacted with a polyol containing a double bond, wherein the polyol containing the double bond is pentaerythritol triacrylate, the molar ratio of γ-methacryloxypropyltrimethoxysilane to pentaerythritol triacrylate is (1-1.8):1, the pre-reaction temperature is 45-46℃, and the pre-reaction time is 1-1.5h, so as to improve the reactivity and dispersibility of the organosilicon monomer in the system. As a further technical solution, the initiator is ammonium persulfate, and when using ammonium persulfate initiator, a co-initiator is added at the same time. The co-initiator is sodium bisulfite, and the mass ratio of ammonium persulfate to sodium bisulfite is (4-5):1, so as to promote the polymerization reaction and improve the reaction efficiency. As a further technical solution, the waterborne toughening agent is a carboxyl-terminated butadiene-acrylic rubber-acrylate copolymer with a number-average molecular weight of 5500-6500. The carboxyl-terminated butadiene-acrylic rubber-acrylate copolymer is grafted with hydroxyl-containing acrylate monomers onto its molecular chain at a grafting rate of 12-13% to enhance its interaction with the waterborne acrylic resin emulsion and further improve the flexibility and impact resistance of the coating. As a further technical solution, in the polymerization reaction process, a staged heating method is adopted, first reacting at 62℃ for 1-1.5h, then heating to 78℃ for 1.5-2h, and finally heating to 85℃ for 0.5-1h, so as to optimize the polymerization reaction process and improve the performance of the coating. As a further technical solution, after preparing the water-based environmentally friendly polyethylene coating, the coating is further post-treated. Specifically, the coating is subjected to vacuum degassing treatment at 32-38℃ for 1-1.6 hours, and then filtered through a 0.4-0.5μm microporous membrane to remove bubbles and impurities from the coating and improve the quality and stability of the coating. The beneficial effects of this invention are: This invention uses water-based acrylic resin emulsion as the main film-forming substance, which has good film-forming properties and water resistance. It can form a continuous and dense coating on the surface of polyethylene, providing basic protection and decorative functions for the coating.

[0009] The introduced composite nanofiller is composed of nano-silicon carbide and nano-montmorillonite in a specific ratio. Nano-silicon carbide has high hardness, enhancing the coating's hardness and wear resistance; nano-montmorillonite flakes have a large specific surface area and cation exchange capacity, improving the coating's barrier properties and preventing external substances from eroding the polyethylene. After special treatment, the composite nanofiller exhibits better dispersibility in the coating system and enhanced compatibility with water-based acrylic resin emulsions, further improving the overall performance of the coating. The organosilicon monomer, γ-methacryloyloxypropyltrimethoxysilane, undergoes pre-reaction with pentaerythritol triacrylate, improving its reactivity and dispersibility in the system. The organosilicon monomer can form a cross-linked structure in the coating, enhancing its adhesion and water resistance, and improving its hardness and wear resistance.

[0010] Ammonium persulfate, used as an initiator, in combination with sodium bisulfite as a co-initiator, can promote the polymerization reaction, improve reaction efficiency, and enable the water-based acrylic resin emulsion, organosilicon monomers and other monomers to fully polymerize and form a polymer coating with excellent performance.

[0011] The carboxyl-terminated butadiene-acrylic rubber-acrylate copolymer was grafted with hydroxyl-containing acrylate monomers, which enhanced its interaction with the waterborne acrylic resin emulsion, further improving the coating's flexibility and impact resistance, making the coating less prone to cracking under external force.

[0012] This invention utilizes a treated composite nanofiller uniformly dispersed in an aqueous acrylic resin emulsion to form a stable system. Organosilicon monomers, under the action of initiators and co-initiators, polymerize with the aqueous acrylic resin emulsion to form a cross-linked structure, enhancing the overall strength and adhesion of the coating. A water-based toughening agent intertwines with the aqueous acrylic resin emulsion through chemical bonds and physical interactions, improving the coating's flexibility and impact resistance. An antifoaming agent ensures the uniformity and stability of the coating system. A staged heating method is employed during the polymerization reaction to optimize the process, allowing for complete reaction of all components and further improving the coating's performance. The post-treatment process removes bubbles and impurities from the coating, improving its quality and stability. The resulting water-based environmentally friendly polyethylene coating exhibits excellent comprehensive performance. Detailed Implementation

[0013] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] This invention provides a method for preparing a water-based environmentally friendly polyethylene coating, comprising the following steps: Raw material preparation: By weight, prepare 62-78 parts of water-based acrylic resin emulsion, 15-18 parts of composite nanofiller, 0.2-0.3 parts of defoamer, 6-7 parts of organosilicon monomer, 0.2-0.3 parts of initiator, and 1.2-1.5 parts of water-based toughening agent. The composite nanofiller is composed of nano-silicon carbide and nano-montmorillonite in a mass ratio of 1:(5-8).

[0015] The composite nanofiller was treated as follows: the composite nanofiller was dispersed in an ethanol-water mixed solution, wherein the volume ratio of ethanol to water was 1:(2-3), the mass concentration of the composite nanofiller was 7-7.8 g / L, and ultrasonically dispersed for 30-40 min; then, bis(octadecyldimethylammonium chloride) was added, wherein the mass ratio of bis(octadecyldimethylammonium chloride) to the composite nanofiller was (0.1-0.16):1, and the mixture was stirred and reacted at 55-58℃ for 2-3 h. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller.

[0016] The treated composite nanofiller was added to the aqueous acrylic resin emulsion and stirred until homogeneous to obtain a mixture.

[0017] Add defoamer, organosilicon monomer, initiator and water-based toughening agent to the mixture, continue stirring, and then carry out polymerization reaction at 60-65℃ for 3-4 hours. After the reaction is completed, water-based environmentally friendly polyethylene coating is obtained.

[0018] In this invention, the solid content of the aqueous acrylic resin emulsion is 40-45%, and the glass transition temperature is 8℃-12℃; the particle size of the nano-silicon carbide is 10-30nm, and the thickness of the nano-montmorillonite sheets is 1-2nm; the defoamer is an organosilicon defoamer; the organosilicon monomer is γ-methacryloyloxypropyltrimethoxysilane, and before adding the organosilicon monomer, it is pre-reacted with pentaerythritol triacrylate, the molar ratio of γ-methacryloyloxypropyltrimethoxysilane to pentaerythritol triacrylate is (1-1.8):1, the pre-reaction temperature is 45-46℃, and the pre-reaction time is 1-1.5h; the initiator is ammonium persulfate, and when using ammonium persulfate initiator, sodium bisulfite is added simultaneously as an initiator. The agent, ammonium persulfate to sodium bisulfite, has a mass ratio of (4-5):1; the water-based toughening agent is a carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer with a number average molecular weight of 5500-6500, and the carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer is grafted modified with a grafting rate of 12-13%; in the polymerization reaction, a segmented heating method is adopted, first reacting at 62℃ for 1-1.5h, then heating to 78℃ for 1.5-2h, and finally heating to 85℃ for 0.5-1h; after preparing the water-based environmentally friendly polyethylene coating, the coating is also post-treated, specifically: the coating is vacuum degassed at 32-38℃ for 1-1.6h, and then filtered through a 0.4-0.5μm microporous membrane.

[0019] To further illustrate the present invention, the following examples provide a detailed description. The aqueous acrylic resin emulsion used in the following examples of the present invention has a solid content of 42% and a glass transition temperature of 10°C; the nano-silicon carbide particle size is 20 nm; the nano-montmorillonite sheet thickness is 1.5 nm; the number-average molecular weight of the carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer is 6000, and the grafting rate is 12.5%. Example 1

[0020] (1) Weigh out 62 parts of water-based acrylic resin emulsion, 15 parts of composite nanofiller (nano silicon carbide and nano montmorillonite in a mass ratio of 1:5), 0.2 parts of organosilicon defoamer, 6 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.2 parts of ammonium persulfate, and 1.2 parts of carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer by weight.

[0021] (2) The composite nanofiller was dispersed in an ethanol-water mixed solution (ethanol to water volume ratio of 1:2) with a mass concentration of 7 g / L and ultrasonically dispersed for 30 min. Then, bis(octadecyldimethylammonium chloride) (mass ratio of 0.1:1 to the composite nanofiller) was added and stirred at 55 °C for 2 h. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller.

[0022] (3) Add the treated composite nanofiller to the water-based acrylic resin emulsion and stir evenly to obtain a mixture.

[0023] (4) γ-Methacryloxypropyltrimethoxysilane and pentaerythritol triacrylate were pre-reacted at 45°C for 1 h at a molar ratio of 1:1. Then, the mixture was added to the pre-reaction mixture, followed by the addition of silicone defoamer, ammonium persulfate, and carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer. The mixture was stirred continuously, and sodium bisulfite co-initiator was added simultaneously. The mass ratio of ammonium persulfate to sodium bisulfite was 4:1. The polymerization reaction was carried out at 60°C for 3 h. During the reaction, the mixture was first reacted at 62°C for 1 h, then the temperature was raised to 78°C for 1.5 h, and finally the temperature was raised to 85°C for 0.5 h.

[0024] (5) After the reaction is complete, the coating is subjected to vacuum degassing treatment at 32°C for 1 hour, and then filtered through a 0.4μm microporous membrane to obtain water-based environmentally friendly polyethylene coating. Example 2

[0025] (1) Weigh out 70 parts of water-based acrylic resin emulsion, 16 parts of composite nanofiller (nano silicon carbide and nano montmorillonite in a mass ratio of 1:6), 0.25 parts of organosilicon defoamer, 6.5 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.25 parts of ammonium persulfate, and 1.3 parts of carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer by weight.

[0026] (2) The composite nanofiller was dispersed in an ethanol-water mixed solution (ethanol to water volume ratio of 1:2.5) with a mass concentration of 7.4 g / L and ultrasonically dispersed for 35 min. Then, bis(octadecyldimethylammonium chloride) (mass ratio of 0.13:1 to the composite nanofiller) was added and stirred at 56 °C for 2.5 h. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller.

[0027] (3) Add the treated composite nanofiller to the water-based acrylic resin emulsion and stir evenly to obtain a mixture.

[0028] (4) γ-Methacryloxypropyltrimethoxysilane and pentaerythritol triacrylate were pre-reacted at 45.5℃ for 1.2h in a molar ratio of 1.4:1. The mixture was then added to the pre-reaction solution, followed by the addition of an organosilicon defoamer, ammonium persulfate, and a carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer. Stirring continued, and sodium bisulfite co-initiator was added simultaneously. The mass ratio of ammonium persulfate to sodium bisulfite was 4.5:1. The polymerization reaction was carried out at 62℃ for 3.5h. During the reaction, the temperature was first raised to 62℃ for 1.2h, then increased to 78℃ for 1.6h, and finally raised to 85℃ for 0.7h.

[0029] (5) After the reaction is complete, the coating is subjected to vacuum degassing treatment at 35°C for 1.3h, and then filtered through a 0.45μm microporous membrane to obtain water-based environmentally friendly polyethylene coating. Example 3

[0030] (1) Weigh out 75 parts of water-based acrylic resin emulsion, 17 parts of composite nanofiller (nano silicon carbide and nano montmorillonite in a mass ratio of 1:7), 0.3 parts of organosilicon defoamer, 6.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.3 parts of ammonium persulfate, and 1.4 parts of carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer by weight.

[0031] (2) The composite nanofiller was dispersed in an ethanol-water mixed solution (ethanol to water volume ratio of 1:3) with a mass concentration of 7.6 g / L and ultrasonically dispersed for 38 min. Then, bis(octadecyldimethylammonium chloride) (mass ratio of 0.15:1 to the composite nanofiller) was added and stirred at 57 °C for 2.8 h. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller.

[0032] (3) Add the treated composite nanofiller to the water-based acrylic resin emulsion and stir evenly to obtain a mixture.

[0033] (4) γ-Methacryloxypropyltrimethoxysilane and pentaerythritol triacrylate were pre-reacted at 45.8℃ for 1.3h in a molar ratio of 1.6:1. The mixture was then added to the pre-reaction solution, followed by the addition of an organosilicon defoamer, ammonium persulfate, and a carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer. Stirring continued, and sodium bisulfite co-initiator was added simultaneously. The mass ratio of ammonium persulfate to sodium bisulfite was 4.2:1. The polymerization reaction was carried out at 64℃ for 3.8h. During the reaction, the temperature was first raised to 62℃ for 1.3h, then increased to 78℃ for another 1.8h, and finally raised to 85℃ for 0.7h.

[0034] (5) After the reaction is complete, the coating is subjected to vacuum degassing treatment at 36°C for 1.5 h, and then filtered through a 0.48 μm microporous membrane to obtain water-based environmentally friendly polyethylene coating. Example 4

[0035] (1) Weigh out 78 parts of water-based acrylic resin emulsion, 18 parts of composite nanofiller (nano silicon carbide and nano montmorillonite in a mass ratio of 1:8), 0.3 parts of organosilicon defoamer, 7 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.3 parts of ammonium persulfate, and 1.5 parts of carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer by weight.

[0036] (2) The composite nanofiller was dispersed in an ethanol-water mixed solution (ethanol to water volume ratio of 1:3) with a mass concentration of 7.8 g / L and ultrasonically dispersed for 40 min. Then, bis(octadecyldimethylammonium chloride) (mass ratio of 0.16:1 to the composite nanofiller) was added and stirred at 58 °C for 3 h. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller.

[0037] (3) Add the treated composite nanofiller to the water-based acrylic resin emulsion and stir evenly to obtain a mixture.

[0038] (4) γ-Methacryloxypropyltrimethoxysilane and pentaerythritol triacrylate were pre-reacted at 46°C for 1.5 h at a molar ratio of 1.8:1. The mixture was then added to the pre-reaction solution, followed by the addition of an organosilicon defoamer, ammonium persulfate, and a carboxyl-terminated butadiene-acrylic acid rubber-acrylate copolymer. Stirring continued, and sodium bisulfite co-initiator was added simultaneously. The mass ratio of ammonium persulfate to sodium bisulfite was 5:1. The polymerization reaction was carried out at 65°C for 4 h. During the reaction, the temperature was first raised to 62°C for 1.5 h, then increased to 78°C for 2 h, and finally raised to 85°C for 1 h.

[0039] (5) After the reaction is complete, the coating is subjected to vacuum degassing treatment at 38°C for 1.6 h, and then filtered through a 0.5 μm microporous membrane to obtain water-based environmentally friendly polyethylene coating.

[0040] Comparative Example 1 Based on Example 1, the difference from Example 1 is that the composite filler is conventional nano-bentonite without any treatment.

[0041] Comparative Example 2 Based on Example 1, the difference from Example 1 is that the initiator sodium bisulfite will not be added.

[0042] test Adhesion test The tests were conducted according to GB / T9286-1998 "Cross-cut test for paint and varnish films", using polyethylene sheets as the substrate. The test results for the examples and comparative samples were as follows: Table 1

[0043] As can be seen from Table 1, the adhesion of the embodiment of the present invention reached level 0, indicating that the coating is very firmly bonded to the polyethylene surface.

[0044] Abrasion resistance test The abrasion resistance of the coatings in the examples and comparative examples after curing under the same conditions was tested according to GB / T1768-2006 "Determination of Abrasion Resistance of Paints and Varnishes - Rotating Rubber Grinding Wheel Method".

[0045] As can be seen from Table 2, the coating prepared by the present invention has significantly improved wear resistance and can better resist wear.

[0046] 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.

Claims

1. A method for preparing a water-based environmentally friendly polyethylene coating, characterized in that, Includes the following steps: Prepare raw materials: by weight, prepare 62-78 parts of water-based acrylic resin emulsion, 15-18 parts of composite nanofiller, 0.2-0.3 parts of defoamer, 6-7 parts of organosilicon monomer, 0.2-0.3 parts of initiator, and 1.2-1.5 parts of water-based toughening agent; The composite nanofiller is composed of nano-silicon carbide and nano-montmorillonite in a mass ratio of 1:(5-8); The composite nanofiller was treated as follows: the composite nanofiller was dispersed in an ethanol-water mixed solution, wherein the volume ratio of ethanol to water was 1:(2-3), the mass concentration of the composite nanofiller was 7-7.8 g / L, and ultrasonically dispersed for 30-40 min; then, bis(octadecyldimethylammonium chloride) was added, wherein the mass ratio of bis(octadecyldimethylammonium chloride) to the composite nanofiller was (0.1-0.16):1, and the mixture was stirred at 55-58℃ for 2-3 h. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and dried to obtain the treated composite nanofiller. The treated composite nanofiller was added to the aqueous acrylic resin emulsion and stirred evenly to obtain a mixture. Add defoamer, organosilicon monomer, initiator and water-based toughening agent to the mixture, continue stirring, and then carry out polymerization reaction at 60-65℃ for 3-4 hours. After the reaction is completed, water-based environmentally friendly polyethylene coating is obtained.

2. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The waterborne acrylic resin emulsion has a solid content of 40-45% and a glass transition temperature of 8℃-12℃.

3. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The nano-silicon carbide has a particle size of 10-30 nm, and the nano-montmorillonite has a layer thickness of 1-2 nm.

4. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The defoamer is an organosilicone defoamer.

5. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The organosilicon monomer is γ-methacryloxypropyltrimethoxysilane, and before adding the organosilicon monomer, it is pre-reacted with a polyol containing a double bond. The polyol containing the double bond is pentaerythritol triacrylate, and the molar ratio of γ-methacryloxypropyltrimethoxysilane to pentaerythritol triacrylate is (1-1.8):

1. The pre-reaction temperature is 45-46℃, and the pre-reaction time is 1-1.5h.

6. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The initiator is ammonium persulfate, and when using ammonium persulfate initiator, a co-initiator is added at the same time. The co-initiator is sodium bisulfite, and the mass ratio of ammonium persulfate to sodium bisulfite is (4-5):

1.

7. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, The water-based toughening agent is a carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer with a number average molecular weight of 5500-6500. The carboxyl-terminated butadiene-acrylonitrile rubber-acrylate copolymer has been grafted modified, with hydroxyl-containing acrylate monomers grafted onto its molecular chain at a grafting rate of 12-13%.

8. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, In the polymerization process, a staged heating method is adopted: first, the reaction is carried out at 62°C for 1-1.5 hours, then the temperature is increased to 78°C and the reaction continues for 1.5-2 hours, and finally the temperature is increased to 85°C and the reaction is carried out for 0.5-1 hours.

9. The method for preparing a water-based environmentally friendly polyethylene coating according to claim 1, characterized in that, After preparing the water-based environmentally friendly polyethylene coating, the coating is further post-treated, specifically by vacuum degassing at 32-38℃ for 1-1.6 hours, and then filtered through a 0.4-0.5μm microporous membrane.

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