Water-based environment-friendly blister varnish and preparation method thereof

Abstract

The invention belongs to the technical field of plastic uptake oil preparation, and particularly relates to water-based environment-friendly plastic uptake oil and a preparation method thereof. The plastic uptake oil comprises the following components in parts by weight: a weather-resistant polyurethane dispersion, a core-shell acrylic emulsion, a silane coupling agent, diacetone acrylamide, adipic dihydrazide, nano silicon dioxide, nano zinc oxide, a coalescing agent, an ultraviolet light absorber, a light stabilizer and deionized water, and can also comprise a defoaming agent, a wetting agent and a thickening agent. The preparation method comprises the steps of pre-dispersing the filler, compounding the main body and adding the auxiliary agent. The weather-resistant polyurethane and the core-shell acrylic emulsion are compounded, and the nano filler, the silane coupling agent, the cross-linking agent and the weather-resistant additive are combined, so that a weather-resistant system with synergistic structure shielding, nano reflection and additive absorption is constructed, and the synergistic improvement of ultraviolet yellowing resistance, low-temperature flexibility, high specular glossiness and food-grade environmental protection property is realized; the water-based blister varnish overcomes the defects of traditional water-based blister varnish in the aspects of gloss, weather resistance, low temperature and adhesive force, and can be used in the field of high-end packaging.

Description

Technical Field

[0001] The invention belongs to the technical field of blister oil preparation, and particularly relates to a water-based environmentally friendly blister oil and a preparation method thereof. Background Art

[0002] As a core material for bonding paper and plastic sheets in the packaging and printing industry, blister oil's performance directly determines the quality and application scope of blister packaging. However, in applications such as high-end cold beverage packaging (such as ice cream and frozen foods), the performance shortcomings of traditional water-based blister oils are gradually becoming apparent, making it difficult to meet increasingly stringent usage requirements.

[0003] In terms of weather resistance, traditional water-based blister packaging oils often use polyurethanes containing aromatic structures (such as those synthesized from pure toluene diisocyanate (TDI)). Long-term exposure to sunlight in display cases in supermarkets and other places can cause the packaging graphics to yellow. This yellowing not only diminishes the product's visual appeal but can also cause consumers to misjudge the food's freshness, further impacting brand trust.

[0004] In terms of low-temperature adaptability, the glass transition temperature of traditional water-based blister coatings in frozen environments is higher than the operating temperature, and the incidence of brittle cracking defects is significantly higher than in room-temperature environments. For example, during the transportation of frozen pizza packaging, the blister film and cardboard may separate due to cracking of the coating. Air infiltration can cause oxidation and deterioration of the food, and even lead to packaging damage and soup leakage, seriously affecting the end-user experience and food safety.

[0005] In terms of balancing gloss and adhesion, high-end cold drink packaging typically requires a mirror-like finish with a 60° gloss of ≥80 to create an "icy" and "highly transparent" effect. However, traditional water-based systems suffer from uneven dispersion of nanofillers and a mismatch between resin particle size (>100nm) and filler particle size (20-50nm), resulting in enhanced light scattering and a gloss generally below 75. Furthermore, in low-temperature environments, insufficient interfacial crosslinking leads to low peel strength, making the blister film prone to falling off or leaving a residual adhesive layer when opened, compromising the user experience and packaging integrity.

[0006] Furthermore, in terms of balancing environmental performance with performance, packaging for baby food and high-end cold drinks must meet the GB 38507-2020 environmental standards for food contact materials. However, some traditional water-based blister packing oils rely on solvent-based additives (such as toluene solvents) or single-ingredient modifications (such as adding only UV absorbers) to improve weather resistance or adhesion, resulting in excessive VOC levels or insufficient weather resistance. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention provides a water-based, environmentally friendly blister oil and its preparation method. The purpose of this invention is to address the pain points of high-end packaging scenarios by developing a water-based blister oil that combines light yellowing resistance, low-temperature flexibility, high specular gloss, and food-grade environmental friendliness. This approach addresses the technical bottlenecks of traditional products in maintaining appearance, adaptability to low temperatures, durability, and safety, and meets the long-term reliability requirements of high-end blister packaging in the food, pharmaceutical, and other fields.

[0008] The first aspect of the present invention is to provide an environmentally friendly water-based blister oil.

[0009] Water-based environmentally friendly blister oil includes the following components by weight:

[0010] 30-50 parts of weather-resistant polyurethane dispersion (A-1);

[0011] 30-50 parts of core-shell acrylic emulsion (B-1);

[0012] 0.8-1.2 parts of silane coupling agent;

[0013] 1.0-2.0 parts of diacetone acrylamide (DAAM);

[0014] 1.0-2.0 parts of adipic acid dihydrazide (ADH);

[0015] 1.5-2.5 parts of nano-silicon dioxide;

[0016] 0.8-1.2 parts of nano zinc oxide;

[0017] 3.0-5.0 parts of film-forming aid;

[0018] 0.5-1.0 parts of ultraviolet absorber;

[0019] 0.3-0.7 parts of light stabilizer;

[0020] 6.0-12.5 parts of deionized water

[0021] As a further optimization scheme for water-based environmentally friendly blister oil, the weather-resistant polyurethane dispersion (A-1) is prepared by reacting toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), polyethylene adipate glycol, polytetramethylene ether glycol (PTMEG) and dihydroxymethylbutyric acid (DMBA).

[0022] As a further optimization scheme for water-based environmentally friendly blister oil, the core layer of the core-shell acrylic emulsion (B-1) is a copolymer of methyl methacrylate and butyl acrylate; the shell layer is a copolymer of ethyl acrylate, methacrylic acid and γ-methacryloyloxypropyltrimethoxysilane.

[0023] As a further optimization solution for the water-based environmentally friendly blister oil, the particle size of the nano-silicon dioxide is 10-30 nm, the particle size of the nano-zinc oxide is 35-55 nm, and the total amount of the two is 2.5 to 3.5 parts.

[0024] As a further optimization scheme for the water-based environmentally friendly blister oil, the silane coupling agent is γ-methacryloxypropyltrimethoxysilane (KH-570); the film-forming aid is dipropylene glycol butyl ether (DPnB); the ultraviolet absorber is Tinuvin 1130; and the light stabilizer is the hindered amine light stabilizer Chimassorb 944.

[0025] As a further optimization solution for water-based environmentally friendly blister oil, it also includes:

[0026] Defoaming agent 0.1-0.3 parts;

[0027] Wetting agent 0.2-0.4 parts;

[0028] Thickener 0.4-0.7 parts.

[0029] The second aspect of the present invention is to provide a method for preparing an environmentally friendly water-based blister oil, comprising the following steps:

[0030] Step S1: pre-dispersing fillers, adding nano-silicon dioxide and nano-zinc oxide into a portion of deionized water, and dispersing them to form a uniform slurry;

[0031] Step S2: Compounding the main body: adding the weather-resistant polyurethane dispersion (A-1) and the core-shell acrylic emulsion (B-1) into a dispersion kettle, stirring, and then adding the pre-hydrolyzed silane coupling agent and the pre-mixed DAAM / ADH crosslinking agent, stirring evenly;

[0032] Step S3: Adding an auxiliary agent: adding the filler slurry prepared in step S1 to the mixture prepared in step S2, adding an auxiliary agent, and mixing evenly to obtain the water-based environmentally friendly blister oil.

[0033] As a further optimization scheme for the preparation method of the water-based environmentally friendly blister oil, in step S1, the material is ultrasonically dispersed for 20-40 minutes at an ultrasonic power of 300-500 W to form a uniform slurry.

[0034] As a further optimization scheme for the preparation method of water-based environmentally friendly blister oil, in step S2:

[0035] The preparation method of the weather-resistant polyurethane dispersion (A-1) comprises: adding toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), polyethylene adipate, polytetramethylene ether glycol (PTMEG), dimethylolbutyric acid (DMBA) and acetone into a reaction kettle; heating the mixture to 95-105° C. under nitrogen protection and performing vacuum dehydration for 1-3 hours; cooling the mixture to 65-75° C. and reacting the mixture for 2-4 hours until the NCO% reaches 3.4%-3.6%; adding acetone for dilution, cooling the mixture to 35-45° C., adding triethylamine for neutralization for 3-8 minutes, slowly pouring deionized water into the mixture, performing high-speed shear dispersion at 8000-12000 rpm for 20-40 minutes, and recovering the acetone by vacuum distillation to obtain a dispersion having a solid content of 40±2% and a particle size of ≤80 nm;

[0036] The preparation method of the core-shell acrylic emulsion (B-1) comprises: pre-emulsifying methyl methacrylate (MMA), butyl acrylate (BA), deionized water and part of the initiator at 65-75°C for 20-40 minutes, heating to 80-90°C and polymerizing for 1.5-2.5 hours to form a core-layer emulsion with a particle size of 40-60 nm; and dropwise adding ethyl acrylate (EA), methacrylic acid (MAA), γ-methacryloyloxypropyltrimethoxysilane (KH-570), deionized water and the initiator into the core-layer emulsion, reacting at 75-85°C for 2.5-3.5 hours to obtain a core-shell emulsion with a solid content of 45±2% and a particle size of ≤90 nm.

[0037] As a further optimization scheme for the preparation method of water-based environmentally friendly blister oil, in step S3, filler slurry, film-forming aid DPnB, ultraviolet absorber, light stabilizer, defoamer, and wetting agent are added to the mixture prepared in step S2 in sequence, stirred evenly, and finally a thickener is added to adjust the viscosity to coat four cups for 30 seconds (25°C).

[0038] Beneficial effects

[0039] The water-based, environmentally friendly blister oil provided by the present invention has excellent comprehensive performance: a weather-resistant polyurethane is compounded with a core-shell acrylic emulsion, combined with an aliphatic isocyanate, nano-silica / zinc oxide, and a weathering additive to create a "structural shielding-nano-reflection-additive absorption" weathering system, significantly improving UV yellowing resistance and low-temperature flexibility. Silane coupling agents and DAAM / ADH crosslinkers synergistically enhance interfacial adhesion, significantly improving PET peel strength. Nanofillers are matched to resin particle size to achieve excellent gloss and a mirror-like effect. Furthermore, the water-based system and low-VOC additives ensure environmental friendliness (VOC ≤ 50g / L), addressing the shortcomings of traditional products in gloss, weathering resistance, low-temperature resistance, and adhesion, making it suitable for high-end packaging applications. DETAILED DESCRIPTION

[0040] The present invention is further illustrated below by means of specific examples. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0041] 1. Weather-resistant polyurethane dispersion (A-1) and its preparation method

[0042] Raw materials (parts by weight):

[0043] Toluene diisocyanate (TDI-80): 60 parts;

[0044] Hexamethylene diisocyanate (HDI): 40 parts;

[0045] Polyethylene adipate (number average molecular weight 2000): 70 parts;

[0046] Polytetramethylene ether glycol (PTMEG, number average molecular weight 1000): 30 parts;

[0047] Dimethylolbutyric acid (DMBA): 8 parts;

[0048] Triethylamine: 7.2 parts;

[0049] Deionized water: 420 parts;

[0050] Acetone (reaction solvent): 200 parts (recovered by subsequent distillation).

[0051] Preparation steps:

[0052] TDI, HDI, polyethylene adipate, PTMEG, DMBA and acetone were added to the reactor, heated to 100°C under nitrogen protection, vacuum dehydrated for 2 hours, then cooled to 70°C and reacted for 3 hours until the NCO% was 3.5% (theoretical value 3.6%).

[0053] 100 parts of acetone was added to dilute the mixture, the temperature was lowered to 40° C., triethylamine was added to neutralize the mixture for 5 minutes, deionized water was slowly poured into the mixture, and high-speed shear dispersion (10,000 rpm) was performed for 30 minutes to form a milky white dispersion.

[0054] Acetone was recovered by distillation under reduced pressure (60° C., −0.09 MPa) to obtain a dispersion with a solid content of 40% and a particle size of 72 nm (measured by a laser particle size analyzer) and a minimum film forming temperature (MFFT) of −5° C.

[0055] 2. Core-shell acrylic emulsion (B-1) and its preparation method

[0056] Raw materials (parts by weight):

[0057] Core layer monomers: 50 parts of methyl methacrylate (MMA), 30 parts of butyl acrylate (BA), and 1 part of ammonium persulfate.

[0058] Shell monomers: 40 parts of ethyl acrylate (EA), 10 parts of methacrylic acid (MAA), 5 parts of γ-methacryloxypropyltrimethoxysilane (KH-570), and 0.5 parts of ammonium persulfate.

[0059] Deionized water: 500 parts.

[0060] Preparation steps:

[0061] Core layer polymerization: MMA, BA, 50% deionized water and 0.5 parts of ammonium persulfate were added to the reactor, pre-emulsified at 70°C for 30 minutes, heated to 85°C for polymerization for 2 hours to form a core layer seed emulsion (particle size 50 nm).

[0062] Shell coating: EA, MAA, KH-570, the remaining deionized water, and 0.5 parts of ammonium persulfate were added dropwise and reacted at 80°C for 3 hours to form a core-shell structure emulsion with a solid content of 45%, a particle size of 85 nm, and a minimum film forming temperature (MFFT) of -15°C.

[0063] Example 1

[0064] A water-based environmentally friendly blister oil, the formula includes the following components (by weight):

[0065] Table 1

[0066]

[0067]

[0068] Preparation steps:

[0069] Pre-dispersed filler: Add nano-silica and zinc oxide to 5 parts of deionized water and ultrasonically disperse for 30 minutes (power 400W) to form a uniform slurry.

[0070] Main body compounding: Add polyurethane dispersion A-1 and acrylic emulsion B-1 into a dispersion kettle and stir at 200 rpm for 10 minutes; add silane coupling agent (preliminarily hydrolyzed with ethanol: water = 1:1 for 5 minutes) and DAAM / ADH (premixed in 1:1) and continue stirring for 20 minutes.

[0071] Addition of additives: add filler slurry, film-forming additive DPnB, weathering additive (UV absorber + light stabilizer), defoamer, and wetting agent in sequence, stir at 500 rpm for 30 minutes, and finally add thickener to adjust the viscosity to coat four cups for 30 seconds (25°C).

[0072] Example 2-3

[0073] Adjust the ratio of polyurethane to acrylic emulsion and the amount of filler (as shown in the table below). The amounts of other components and the steps are the same as in Example 1:

[0074] Table 2

[0075] project Example 1 Example 2 Example 3 Polyurethane dispersion A-1 40 50 30 Core-shell acrylic emulsion B-1 40 30 50 Nanosilica 2.0 1.5 2.5 Deionized water 8.2 12.5 6.0

[0076] Comparative Example 1: No weathering modification was introduced (only the polyurethane structure was changed)

[0077] This preparation differed from Example 1 in that a purely aromatic polyurethane dispersion (containing only TDI, without HDI or PTMEG) was used. Specifically, the HDI in Preparation Example 1 was replaced with an equal molar amount of TDI, and only polyethylene adipate (without PTMEG) was used as the polyol. All other raw materials and processes remained unchanged. The resulting polyurethane dispersion had a particle size of 90 nm, a minimum film-forming temperature (MFFT) of 5°C, and contained no aliphatic segments or flexible ether bonds.

[0078] Comparative Example 2: No core-shell structure (only the acrylic emulsion structure is changed)

[0079] The difference from Example 1 is that a homopolymerized acrylic emulsion (non-core-shell structure) is used, that is, the acrylic emulsion is directly polymerized from a copolymer of methyl methacrylate (MMA), butyl acrylate (BA), and ethyl acrylate (EA) (without core-shell delamination), has a particle size of 150 nm, a minimum film forming temperature (MFFT) of 10° C., and no KH-570 silane coupling agent is introduced to modify the shell layer.

[0080] Comparative Example 3: Omitting DAAM (Only missing crosslinker component 1)

[0081] The difference from Example 1 is that no diacetone acrylamide (DAAM) is added, and only an equimolar amount of adipic acid dihydrazide (ADH) is used as a cross-linking agent (no cross-linking reaction actually occurs because DAAM / ADH need to be used in pairs), and the other auxiliary agents and their amounts remain unchanged.

[0082] Comparative Example 4: Omitting ADH (Only missing cross-linker component 2)

[0083] The difference from Example 1 is that adipic acid dihydrazide (ADH) was not added, and only an equimolar amount of diacetone acrylamide (DAAM) was used as a cross-linking agent (no cross-linking reaction actually occurred because DAAM needs to react with ADH to form double bond cross-links), and the other auxiliary agents and their amounts remained unchanged.

[0084] Comparative Example 5: Omitting some functional additives

[0085] The difference from Example 1 is that the silane coupling agent KH-570, nano-silicon dioxide, nano-zinc oxide, ultraviolet absorber and hindered amine light stabilizer are omitted, and the other components and amounts remain unchanged.

[0086] Performance testing methods

[0087] 60° gloss: According to GB / T 9754-2007, use MN268 gloss meter and test after drying for 24 hours after coating.

[0088] UV yellowing resistance: According to GB / T 16422.3-2021, UV aging box (340nm wavelength, 60℃, 500h), ΔE value before and after test (ΔE≤2.0 is qualified).

[0089] -20℃ low temperature flexibility: According to GB / T 16779-2021, bend the coating 180° around a 2mm rod and observe whether it cracks (no cracks are considered to meet the standard).

[0090] PET peel strength: According to GB / T 2792-2020, 180° peel test, speed 300mm / min, substrate is 300g / m2 cardboard and PET sheet (thickness 0.2mm).

[0091] VOC content: determined by gas chromatography in accordance with GB / T 37884-2019. Limit: ≤50g / L.

[0092] Table 3

[0093]

[0094] Table 4

[0095] Group PET peel strength (N / cm) VOC content (g / L) Example 1 5.5 48.0 Example 2 5.3 47.5 Example 3 5.2 48.5 Comparative Example 1 4.0 49.0 Comparative Example 2 4.6 48.8 Comparative Example 3 3.8 48.2 Comparative Example 4 3.8 48.2 Comparative Example 5 4.6 49.5

[0096] According to the above test results, in terms of glossiness, Examples 1-3 form a uniformly dispersed nanoscale coating structure by compounding nano-silica (20nm) with a weather-resistant polyurethane dispersion (A-1) and a core-shell acrylic emulsion (B-1) with matching particle size (50-90nm), achieving a mirror effect of 60° glossiness ≥ 80, which is significantly better than traditional water-based blister oil. Comparative Example 1 uses pure aromatic polyurethane (particle size 90nm and no nanofiller), which enhances the light scattering effect and reduces the glossiness to 72.0; the homopolymerized acrylic emulsion of Comparative Example 2 has an uneven particle size (150nm), which further exacerbates light scattering and has a glossiness of 76.0; after omitting the nanofiller in Comparative Example 5, the glossiness depends on the resin structure itself and is only 75.0.

[0097] In terms of UV yellowing resistance, the example introduces aliphatic hexamethylene diisocyanate (HDI), nano-zinc oxide (50nm), and the UV absorber Tinuvin 1130 / hindered amine light stabilizer Chimassorb 944 to form a triple weathering system of "structural shielding-nano-reflection-additive absorption." After 500 hours of UV aging, ΔE ≤ 2.0, achieving the weathering grade of automotive paint. Comparative Example 1 uses pure aromatic polyurethane (containing a benzene ring structure), and due to UV-induced oxidative degradation, ΔE = 4.5 (visible yellowing to the naked eye); Comparative Example 5 lacks weathering-modifying components and nanofillers, and exhibits moderate yellowing, with ΔE rising to 3.2. This shows that the synergistic effect of the aliphatic isocyanate, nanofiller, and weathering additive in this system is the core of inhibiting UV yellowing. Simply relying on the resin structure or additive alone cannot meet high weathering requirements.

[0098] In terms of low-temperature flexibility, the example utilizes the flexible ether bonds of polytetramethylene ether glycol (PTMEG, Tg = -30°C) and a core-shell emulsion soft shell (Tg = -20°C). Bendable around a 2mm rod at -20°C, the coating exhibits excellent low-temperature adaptability without cracking. Comparative Example 1 lacks the flexible PTMEG segment, resulting in microcracks caused by the aggregation of hard segments at low temperatures. Comparative Example 2 utilizes a homopolymer acrylic emulsion (Tg = 10°C), lacking a soft component in the shell and resulting in brittle cracking. This demonstrates that the flexible ether bonds and the soft shell structure of the core-shell emulsion in this system are essential for achieving low-temperature flexibility. Relying solely on a resin matrix or lacking a core-shell layered structure significantly reduces the coating's resistance to low-temperature cracking.

[0099] In terms of peel strength, the embodiment achieves a peel strength of ≥5N / cm (100% paper breaks when tearing the film, cohesive failure) through the chemical anchoring effect of the silane coupling agent (KH-570) and the network structure formed by the DAAM / ADH cross-linking agent. Comparative Example 3 / 4 lacks any cross-linking agent component and cannot form a complete cross-linked network, and the peel strength drops sharply to 3.8N / cm (cohesive failure of the film layer); Comparative Example 5 mainly relies on physical adsorption, with a strength of 4.6N / cm, and part of the film layer falls off. It can be seen that the interfacial chemical bonding of the silane coupling agent and the cross-linking synergistic effect of DAAM / ADH in this system are the key to improving the peel strength. The lack of a cross-linking agent or a coupling agent will lead to insufficient interfacial adhesion, affecting the film tearing effect in practical applications.

[0100] In terms of environmental protection, the VOC content of all groups is ≤50g / L, meeting the environmental protection requirements of GB 38507-2020, indicating that the present invention achieves high performance while ensuring environmental protection through the combination of a water-based system and a low-VOC additive.

[0101] In summary, a comparative analysis of the examples and comparative examples demonstrates that the high performance of the environmentally friendly water-based blister oil described herein stems from the synergistic effect of multiple components: the combination of weather-resistant polyurethane and core-shell acrylic emulsion achieves a balance between film mechanical properties and weather resistance; the matching of nanofillers and resin particle size enhances gloss; the silane coupling agent and DAAM / ADH crosslinking system enhance interfacial adhesion; the combination of aliphatic structure, nanofillers, and weathering additives imparts excellent UV stability; and the flexible ether bonds and core-shell layered design ensure low-temperature adaptability. These synergistic features address the shortcomings of traditional water-based blister oils in gloss, weather resistance, low-temperature performance, and adhesion, providing an effective solution for high-performance water-based packaging materials.

[0102] The above embodiments are exemplary and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A water-based environmentally friendly blister oil, characterized in that: The following components are included by weight: Weather-resistant polyurethane dispersion (A-1) 30-50 parts; Core-shell acrylic emulsion (B-1) 30-50 parts; 0.8-1.2 parts of silane coupling agent; Diacetone acrylamide (DAAM) 1.0-2.0 parts; Adipic acid dihydrazide (ADH) 1.0-2.0 parts; 1.5-2.5 parts of nano-silicon dioxide; 0.8-1.2 parts of nano zinc oxide; 3.0-5.0 parts of film-forming aid; 0.5-1.0 parts of ultraviolet absorber; 0.3-0.7 parts of light stabilizer; 6.0-12.5 parts of deionized water 2. The water-based environmentally friendly blister oil according to claim 1, characterized in that: The weather-resistant polyurethane dispersion (A-1) is prepared by reacting toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), polyethylene adipate glycol, polytetramethylene ether glycol (PTMEG) and dimethylolbutyric acid (DMBA).

3. The water-based environmentally friendly blister oil according to claim 1, characterized in that: The core layer of the core-shell acrylic emulsion (B-1) is a copolymer of methyl methacrylate and butyl acrylate; the shell layer is a copolymer of ethyl acrylate, methacrylic acid and γ-methacryloyloxypropyltrimethoxysilane.

4. The water-based environmentally friendly blister oil according to claim 1, characterized in that: The particle size of the nano silicon dioxide is 10-30 nm, the particle size of the nano zinc oxide is 35-55 nm, and the total amount of the two is 2.5-3.5 parts.

5. The water-based environmentally friendly blister oil according to claim 1, characterized in that: The silane coupling agent is γ-methacryloxypropyltrimethoxysilane (KH-570); the film-forming aid is dipropylene glycol butyl ether (DPnB); the ultraviolet absorber is Tinuvin 1130; and the light stabilizer is the hindered amine light stabilizer Chimassorb 944.

6. The water-based environmentally friendly blister oil according to any one of claims 1 to 5, characterized in that: Also includes: Defoaming agent 0.1-0.3 parts; Wetting agent 0.2-0.4 parts; Thickener 0.4-0.7 parts.

7. The method for preparing the water-based environmentally friendly blister oil according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1: pre-dispersing fillers, adding nano-silicon dioxide and nano-zinc oxide into a portion of deionized water, and dispersing them to form a uniform slurry; Step S2: Compounding the main body: Add the weather-resistant polyurethane dispersion (A-1) and the core-shell acrylic emulsion (B-1) into a dispersion kettle, stir, then add the pre-hydrolyzed silane coupling agent and the pre-mixed DAAM / ADH crosslinking agent, and stir evenly; Step S3: Adding an auxiliary agent: adding the filler slurry prepared in step S1 to the mixture prepared in step S2, adding an auxiliary agent, and mixing evenly to obtain the water-based environmentally friendly blister oil.

8. The method for preparing the water-based environmentally friendly blister oil according to claim 7, characterized in that: In step S1, the material is ultrasonically dispersed for 20-40 minutes at an ultrasonic power of 300-500W to form a uniform slurry.

9. The method for preparing the water-based environmentally friendly blister oil according to claim 7, characterized in that: In step S2: The preparation method of the weather-resistant polyurethane dispersion (A-1) comprises: adding toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), polyethylene adipate, polytetramethylene ether glycol (PTMEG), dimethylolbutyric acid (DMBA), and acetone into a reaction kettle; heating the mixture to 95-105° C. under nitrogen protection and performing vacuum dehydration for 1-3 hours; cooling the mixture to 65-75° C. and reacting the mixture for 2-4 hours until the NCO% reaches 3.4%-3.6%; adding acetone for dilution, cooling the mixture to 35-45° C., adding triethylamine for neutralization for 3-8 minutes, slowly pouring deionized water into the mixture, performing high-speed shear dispersion at 8000-12000 rpm for 20-40 minutes, and recovering the acetone by vacuum distillation to obtain a dispersion having a solid content of 40±2% and a particle size of ≤80 nm; The preparation method of the core-shell acrylic emulsion (B-1) comprises: pre-emulsifying methyl methacrylate (MMA), butyl acrylate (BA), deionized water and part of the initiator at 65-75°C for 20-40 minutes, heating to 80-90°C and polymerizing for 1.5-2.5 hours to form a core-layer emulsion with a particle size of 40-60 nm; and dropwise adding ethyl acrylate (EA), methacrylic acid (MAA), γ-methacryloyloxypropyltrimethoxysilane (KH-570), deionized water and the initiator into the core-layer emulsion, reacting at 75-85°C for 2.5-3.5 hours to obtain a core-shell emulsion with a solid content of 45±2% and a particle size of ≤90 nm.

10. The method for preparing the water-based environmentally friendly blister oil according to claim 7, characterized in that: In step S3, filler slurry, film-forming aid DPnB, ultraviolet absorber, light stabilizer, defoamer, and wetting agent are sequentially added to the mixture prepared in step S2, and stirred evenly. Finally, a thickener is added to adjust the viscosity to coat four cups for 30 seconds (25°C).

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