Anticorrosive weather-resistant coating based on PVB (polyvinyl butyral) resin and preparation method of anticorrosive weather-resistant coating
By performing high acetalization, hydrophobic grafting, and crosslinking modification on PVB resin, combined with the optimization of composite fillers, the problem of water and alkali resistance of PVB resin-based anti-corrosion and weather-resistant coatings in harsh environments was solved, and the anti-corrosion and weather-resistant effects were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 江西天城高新材料有限公司
- Filing Date
- 2026-03-04
- Publication Date
- 2026-05-12
Smart Images
Figure CN122011872A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of anti-corrosion coating technology, specifically relating to an anti-corrosion and weather-resistant coating based on PVB resin and its preparation method. Background Technology
[0002] Polyvinyl butyral (PVB) resin is widely used in coatings, adhesives, photovoltaic encapsulation, and other industrial fields due to its excellent film-forming continuity, substrate adhesion compatibility, and basic weather resistance stability. In the field of anti-corrosion and weather-resistant coatings, PVB resin, with its unique film-forming toughness and good adhesion to substrates such as metals and concrete, has become a potential high-quality binder candidate. However, traditional PVB resin-based anti-corrosion and weather-resistant coatings generally suffer from poor water and alkali resistance and short anti-corrosion life when applied in harsh outdoor environments such as humid, alkaline, and high salt spray conditions, severely limiting their widespread application in high-end anti-corrosion fields such as shipbuilding and marine engineering.
[0003] The PVB resin molecular chain contains a large number of residual polar hydroxyl groups (-OH). The strong hydrophilicity of hydroxyl groups easily forms hydrogen bonds with water molecules, leading to rapid water vapor penetration and damage to the integrity of the coating film. Simultaneously, the low cross-linking density between linear PVB molecules results in a coating film with numerous micropores, providing channels for alkali penetration and causing coating swelling and peeling. Furthermore, uneven filler dispersion in the coating formulation, inappropriate selection of film-forming aids, and interfacial defects formed during film formation further exacerbate the deterioration of water and alkali resistance. Insufficient water and alkali resistance directly allows corrosive media (such as water, alkali solutions, and chloride ions) to easily penetrate the coating, causing substrate corrosion and coating aging, ultimately leading to the failure of anti-corrosion and weather-resistant effects.
[0004] Existing technologies attempt to optimize coating performance through resin compounding and filler modification, such as simply blending PVB with acrylic resin or adding a single type of hydrophobic filler. However, such improvements only enhance the surface water resistance of the coating and cannot address the hydrophilic defects and insufficient cross-linking of PVB resin itself at the molecular structure level, making it difficult to fundamentally improve water and alkali resistance. In the field of PVB modification, existing research focuses on composite binder systems, improving interfacial bonding through hydrogen bond networks, but it does not involve the synergistic design of hydrophobic group grafting and cross-linking modification, thus failing to address the hydrophilic defects at their root.
[0005] Therefore, there is an urgent need to develop a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. By improving water and alkali resistance, the anti-corrosion and weather-resistant effect can be enhanced, enabling the widespread application of PVB resin-based anti-corrosion and weather-resistant coatings in humid and alkaline environments such as ships and marine engineering. Summary of the Invention
[0006] To address the shortcomings of existing technologies, this invention provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. By performing a three-step synergistic modification of PVB resin through high acetalization, hydrophobic grafting, and crosslinking, combined with composite filler optimization and composite film-forming process, the coating's water and alkali resistance is improved to block the penetration of corrosive media, thereby enhancing its anti-corrosion and weather-resistant effects.
[0007] In a first aspect, this application provides a PVB resin-based anti-corrosion and weather-resistant coating, comprising modified PVB resin, acrylic emulsion, composite filler, silicone oil, silane coupling agent, film-forming aid, photoinitiator, and deionized water;
[0008] The composite filler is a mixture of talc, kaolin, wollastonite, montmorillonite and nano-SiO2.
[0009] Preferably, the mass ratio of the modified PVB resin, acrylic emulsion, composite filler, silicone oil, silane coupling agent, film-forming aid, photoinitiator, and deionized water is (30-40):(15-25):(18-25):(5-8):(1-2):(5-8):(3-5):(10-15); the mass ratio of talc, kaolin, wollastonite, organically modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:(2-3):(1-2); the organically modified montmorillonite is montmorillonite modified with hexadecyltrimethylammonium bromide.
[0010] Preferably, the silane coupling agent includes any one of KH-550, KH-560, and KH-570; the film-forming aid includes any one of propylene glycol methyl ether acetate, propylene glycol ethyl ether, and dipropylene glycol methyl ether; and the photoinitiator includes any one of photoinitiator 1173, photoinitiator 184, and photoinitiator TPO.
[0011] Preferably, the preparation of the modified PVB resin includes the following steps:
[0012] T1: PVA (polyvinyl alcohol) and n-butyraldehyde are added to a mixture of ethanol and water, sulfonated activated carbon solid acid is added, and the mixture is reacted at 7-9℃ for 10-12h to obtain acetal PVB resin.
[0013] T2: Methyl methacrylate, fluorinated acrylate and azobisisobutyronitrile are added sequentially to acetal PVB resin and reacted in an oil bath at 80-85℃ for 4-5 hours to obtain graft copolymer.
[0014] T3: Add an isocyanate crosslinking agent to the graft copolymer and react at 55-60℃ for 1-2 hours to obtain modified PVB resin.
[0015] Preferably, in T1, the sulfonated activated carbon solid acid is prepared by sulfonation modification of activated carbon with concentrated sulfuric acid, the sulfonic acid group loading is ≥1.0 mmol / g, and the water content is ≤1%; the mass ratio of PVA, n-butyraldehyde and sulfonated activated carbon solid acid is 100:70:(2-3); the volume ratio of ethanol to water in the ethanol solution is 1.1:1.
[0016] Preferably, in T2, the mass ratio of the acetal PVB resin, methyl methacrylate, fluorinated acrylate, and azobisisobutyronitrile is 100:30:15:(0.2-0.9); the fluorinated acrylate includes any one of tridecafluorooctyl acrylate, perfluorodecyl acrylate, and trifluoroethyl methacrylate.
[0017] Preferably, in T3, the mass ratio of the graft copolymer to the isocyanate crosslinking agent is (11-15):1; the isocyanate crosslinking agent includes any one of hexamethylene diisocyanate, toluene diisocyanate, and isophorone diisocyanate.
[0018] Secondly, this application provides a method for preparing a PVB resin-based anti-corrosion and weather-resistant coating, comprising the following steps:
[0019] S1: Add modified PVB resin and acrylic emulsion to a dispersion tank and stir to obtain a mixed base material;
[0020] S2: Add composite filler to the mixed base material, disperse under high shear, and then treat with ultrasound to obtain a premixed liquid;
[0021] S3: Add organosilicon oil, silane coupling agent, film-forming aid, photoinitiator and deionized water to the premix in sequence, continue stirring, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
[0022] Preferably, in step S1, the stirring conditions are: rotation speed 1300-1500 r / min, stirring time 30-60 min.
[0023] Preferably, in step S2, the high-shear dispersion conditions are: rotation speed 2500-3500 r / min, dispersion time 30-45 min; the ultrasonic conditions are: power 200-250 W, ultrasonic time 20-30 min; and in step S3, the stirring conditions are: rotation speed 300-500 r / min, stirring time 1-3 h.
[0024] Beneficial technical effects:
[0025] This application uses sulfonated activated carbon solid acid as a catalyst. The -SO3H groups on its surface provide protons to enhance the electrophilicity of the butyraldehyde aldehyde group, promoting a nucleophilic addition-elimination reaction between the hydroxyl groups and aldehyde groups of the PVA molecular chain. This reaction, via dehydration of the hemiacetal intermediate, generates a stable acetal bond, significantly reducing the residual hydrophilic hydroxyl groups in the PVB molecular chain, lowering the resin polarity, and laying the foundation for water and alkali resistance. Secondly, the grafting of hydrophobic groups generates free radicals through the thermal homolytic cleavage of azobisisobutyronitrile (AIBN), selectively abstracting the α-H atoms of the PVB molecule to form active sites, which then react with the carbon-carbon double bonds of acrylates and fluorinated monomers. Free radical addition reaction forms a PVB backbone with hydrophobic side chains. The steric hindrance effect prevents water molecules from contacting hydroxyl groups, while the fluorinated side chains further reduce the molecular surface energy and enhance hydrophobicity. Finally, crosslinking modification utilizes the -NCO group of hexamethylene diisocyanate to undergo a nucleophilic addition reaction with the residual hydroxyl oxygen of PVB to generate urethane bonds. This crosslinks the linear PVB molecules to construct a dense three-dimensional network structure, significantly increasing the crosslinking density, reducing coating porosity defects, and improving the coating's water and alkali resistance, thereby enhancing its anti-corrosion and weather resistance. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the preparation process of a PVB resin-based anti-corrosion and weather-resistant coating provided in this application. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.
[0028] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0029] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. The invention will be further described below with reference to embodiments, but is not limited thereto.
[0030] Example 1
[0031] This embodiment provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The PVB resin-based anti-corrosion and weather-resistant coating includes:
[0032] The modified PVB resin, acrylic emulsion, composite filler, silicone oil, KH-550, propylene glycol methyl ether acetate, photoinitiator 184, and deionized water are in a mass ratio of 35:20:22:6:1.5:6:4:13.
[0033] The mass ratio of talc, kaolin, wollastonite, cetyltrimethylammonium bromide-modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:2.5:1.5.
[0034] The preparation steps of the sulfonated activated carbon solid acid are as follows:
[0035] Activated carbon was placed in 98% concentrated sulfuric acid and sulfonated at 100°C for 4 hours. After cooling, it was filtered and washed with deionized water until the pH of the filtrate was 5. Then, it was vacuum dried at 80°C to constant weight to obtain sulfonated activated carbon solid acid with a sulfonic acid loading of ≥1.0 mmol / g and a water content of ≤1%.
[0036] The modified PVB resin preparation steps are as follows:
[0037] T1: PVA, n-butyraldehyde and sulfonated activated carbon solid acid are mixed in a mass ratio of 100:70:2.5, ethanol solution is added, and the mixture is reacted at 8°C for 11 hours to obtain acetal PVB resin.
[0038] T2: Acetal PVB resin, methyl methacrylate, tridecafluorooctyl acrylate and azobisisobutyronitrile are mixed in a mass ratio of 100:30:15:0.45 and reacted in an oil bath at 82°C for 4.5 h to obtain a graft copolymer.
[0039] T3: Add hexamethylene diisocyanate to the graft copolymer at a mass ratio of 13:1 and react at 58°C for 1.5 h to obtain modified PVB resin.
[0040] The preparation method of the PVB resin-based anti-corrosion and weather-resistant coating is as follows: Figure 1 As shown, it includes the following steps:
[0041] S1: Add modified PVB resin and acrylic emulsion to a dispersion vessel and stir at 1400 r / min for 45 min to obtain a mixed base material;
[0042] S2: Add composite filler to the mixed base material, disperse it under high shear at 3000 r / min for 38 min, and then sonicate it at 220 W for 25 min to obtain the premixed liquid;
[0043] S3: Add silicone oil, KH-550, propylene glycol methyl ether acetate, photoinitiator 184 and deionized water to the premix in sequence, stir at 400 r / min for 2 h, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
[0044] Example 2
[0045] This embodiment provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The PVB resin-based anti-corrosion and weather-resistant coating includes:
[0046] The modified PVB resin, acrylic emulsion, composite filler, silicone oil, KH-560, propylene glycol ethyl ether, photoinitiator 1173, and deionized water are in a mass ratio of 30:25:18:5:1:5:3:15.
[0047] The mass ratio of talc, kaolin, wollastonite, cetyltrimethylammonium bromide-modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:2:1.
[0048] The preparation steps of the sulfonated activated carbon solid acid are as follows:
[0049] Activated carbon was placed in 98% concentrated sulfuric acid and sulfonated at 150°C for 2 hours. After cooling, it was filtered and washed with deionized water until the pH of the filtrate was 5.5. Then, it was vacuum dried at 100°C to constant weight to obtain sulfonated activated carbon solid acid with a sulfonic acid loading of ≥1.0 mmol / g and a water content of ≤1%.
[0050] The modified PVB resin preparation steps are as follows:
[0051] T1: PVA, n-butyraldehyde and sulfonated activated carbon solid acid are mixed in a mass ratio of 100:70:2, ethanol solution is added, and the mixture is reacted at 8°C for 12 hours to obtain acetal PVB resin.
[0052] T2: Acetal PVB resin, methyl methacrylate, perfluorodecyl acrylate and azobisisobutyronitrile are mixed in a mass ratio of 100:30:15:0.2 and reacted in an oil bath at 80°C for 5 hours to obtain a graft copolymer.
[0053] T3: Toluene diisocyanate was added to the graft copolymer at a mass ratio of 11:1, and the mixture was reacted at 55°C for 2 hours to obtain the modified PVB resin.
[0054] The preparation method of the PVB resin-based anti-corrosion and weather-resistant coating is as follows: Figure 1 As shown, it includes the following steps:
[0055] S1: Add modified PVB resin and acrylic emulsion to a dispersion vessel and stir at 1300 r / min for 60 min to obtain a mixed base material;
[0056] S2: Add composite filler to the mixed base material, disperse it under high shear at 3000 r / min for 38 min, and then sonicate it at 220 W for 25 min to obtain the premixed liquid;
[0057] S3: Add silicone oil, KH-560, propylene glycol ethyl ether, photoinitiator 1173 and deionized water to the premixed solution in sequence, stir at 300 r / min for 3 h, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
[0058] Example 3
[0059] This embodiment provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The PVB resin-based anti-corrosion and weather-resistant coating includes:
[0060] The modified PVB resin, acrylic emulsion, composite filler, silicone oil, KH-570, dipropylene glycol methyl ether, photoinitiator TPO, and deionized water are in a mass ratio of 40:15:25:8:2:8:5:10.
[0061] The mass ratio of talc, kaolin, wollastonite, hexadecyltrimethylammonium bromide-modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:3:2.
[0062] The preparation steps of the sulfonated activated carbon solid acid are as follows:
[0063] Activated carbon was placed in 98% concentrated sulfuric acid and sulfonated at 130°C for 3 hours. After cooling, it was filtered and washed with deionized water until the pH of the filtrate was 6. Then, it was vacuum dried at 90°C to constant weight to obtain sulfonated activated carbon solid acid with a sulfonic acid loading of ≥1.0 mmol / g and a water content of ≤1%.
[0064] The modified PVB resin preparation steps are as follows:
[0065] T1: PVA, n-butyraldehyde and sulfonated activated carbon solid acid are mixed in a mass ratio of 100:70:3, ethanol solution is added, and the mixture is reacted at 7°C for 10 hours to obtain acetal PVB resin.
[0066] T2: Acetal PVB resin, methyl methacrylate, trifluoroethyl methacrylate and azobisisobutyronitrile are mixed in a mass ratio of 100:30:15:0.9 and reacted in an oil bath at 85°C for 4 hours to obtain a graft copolymer.
[0067] T3: Isophorone diisocyanate was added to the graft copolymer at a mass ratio of 13:1, and the mixture was reacted at 60°C for 1 hour to obtain modified PVB resin.
[0068] The preparation method of the PVB resin-based anti-corrosion and weather-resistant coating is as follows: Figure 1 As shown, it includes the following steps:
[0069] S1: Add modified PVB resin and acrylic emulsion to a dispersion vessel and stir at 1500 r / min for 30 min to obtain a mixed base material;
[0070] S2: Add composite filler to the mixed base material, disperse it under high shear at 3500 r / min for 30 min, and then sonicate it at 250 W for 20 min to obtain the premixed liquid;
[0071] S3: Add silicone oil, KH-570, dipropylene glycol methyl ether, photoinitiator TPO and deionized water to the premixed solution in sequence, stir at 400 r / min for 2 h, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
[0072] Example 4
[0073] This embodiment provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The PVB resin-based anti-corrosion and weather-resistant coating includes:
[0074] The modified PVB resin, acrylic emulsion, composite filler, silicone oil, KH-550, propylene glycol methyl ether acetate, photoinitiator 1173, and deionized water are in a mass ratio of 32:22:20:7:1.5:7:3.5:12.
[0075] The mass ratio of talc, kaolin, wollastonite, hexadecyltrimethylammonium bromide-modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:2.2:1.8.
[0076] The preparation steps of the sulfonated activated carbon solid acid are as follows:
[0077] Activated carbon was placed in 98% concentrated sulfuric acid and sulfonated at 100°C for 4 hours. After cooling, it was filtered and washed with deionized water until the pH of the filtrate was 5. Then, it was vacuum dried at 80°C to constant weight to obtain sulfonated activated carbon solid acid with a sulfonic acid loading of ≥1.0 mmol / g and a water content of ≤1%.
[0078] The modified PVB resin preparation steps are as follows:
[0079] T1: PVA, n-butyraldehyde and sulfonated activated carbon solid acid are mixed in a mass ratio of 100:70:2.3, ethanol solution is added, and the mixture is reacted at 8°C for 11 hours to obtain acetal PVB resin.
[0080] T2: Acetal PVB resin, methyl methacrylate, tridecafluorooctyl acrylate and azobisisobutyronitrile are mixed in a mass ratio of 100:30:15:0.3 and reacted in an oil bath at 82°C for 4.5 h to obtain a graft copolymer.
[0081] T3: Add hexamethylene diisocyanate to the graft copolymer at a mass ratio of 13:1 and react at 58°C for 1.5 h to obtain modified PVB resin.
[0082] The preparation method of the PVB resin-based anti-corrosion and weather-resistant coating is as follows: Figure 1 As shown, it includes the following steps:
[0083] S1: Add modified PVB resin and acrylic emulsion to a dispersion vessel and stir at 1300 r / min for 50 min to obtain a mixed base material;
[0084] S2: Add composite filler to the mixed base material, disperse it under high shear at 2800 r / min for 35 min, and then sonicate it at 210 W for 25 min to obtain the premixed liquid;
[0085] S3: Add silicone oil, KH-550, propylene glycol methyl ether acetate, photoinitiator 1173 and deionized water to the premix in sequence, stir at 400 r / min for 2 h, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
[0086] Comparative Example 1
[0087] This comparative example provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The difference from Example 1 is that the T2 hydrophobic grafting step is omitted, and the acetal PVB resin obtained in T1 is directly subjected to T3 crosslinking modification. The remaining steps and parameters are the same as in Example 1.
[0088] Comparative Example 2
[0089] This comparative example provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The difference from Example 1 is that the T3 crosslinking modification step is omitted, and the graft copolymer obtained in T2 is directly used as the modified PVB resin. The remaining steps and parameters are the same as in Example 1.
[0090] Comparative Example 3
[0091] This comparative example provides a PVB resin-based anti-corrosion and weather-resistant coating and its preparation method. The difference from Example 1 is that the hexadecyltrimethylammonium bromide-modified montmorillonite in the composite filler is replaced with an equal mass of unmodified montmorillonite, while the proportions of the remaining raw materials are the same as in Example 1.
[0092] The anti-corrosion and weather-resistant coatings prepared in Examples 1-4 and Comparative Examples 1-3 of this application were tested and compared in terms of water resistance, alkali resistance, neutral salt spray resistance, gloss retention rate, and adhesion. The results are shown in Table 1.
[0093] Test method:
[0094] Water resistance: According to the "Test Method for Water Resistance of Coating Film", the test conditions are immersion in water at room temperature (23±2)℃ for 1000h, and the test indicators are the appearance of the coating film (whether there is blistering or peeling) and the mass loss rate (%).
[0095] Alkali resistance: According to the "Determination of Alkali Resistance of Building Coatings", the test conditions are (23±2)℃, immersion in 5% (mass fraction) NaOH solution for 500h, and the test indicators are the appearance of the coating (whether there is blistering or peeling) and the adhesion reduction rate (%).
[0096] Neutral salt spray resistance: According to the "Determination of Neutral Salt Spray Resistance of Paints and Varnishes", the test conditions are continuous spraying for 1000 hours, and the test index is the appearance of the coating (whether there are rust spots or peeling).
[0097] Aging tolerance: The test conditions were 1000h xenon lamp aging (irradiance 60W / m², black standard temperature 65℃, relative humidity 50%), and the test index was gloss retention rate (%).
[0098] Adhesion: According to the "Paint and Varnish Pull-Off Test", the test substrate is carbon steel, and the test index is tensile strength (MPa), that is, coating adhesion.
[0099] Table 1 Performance test results of the anti-corrosion and weather-resistant coatings prepared in the examples and comparative examples
[0100]
[0101] As shown in Table 1, the test results of Comparative Examples 1-3 are significantly different from those of Examples 1-4 of the present invention.
[0102] This is because, in Examples 1-4, sulfonated activated carbon solid acid is used as a catalyst. Its surface -SO3H groups provide protons, which enhance the electrophilicity of the butyraldehyde aldehyde group, promoting a nucleophilic addition-elimination reaction between the hydroxyl groups and aldehyde groups of the PVA molecular chain. This leads to the dehydration of the hemiacetal intermediate to generate a stable acetal bond, significantly reducing the residual hydrophilic hydroxyl groups in the PVB molecular chain, lowering the resin polarity, and laying the foundation for water and alkali resistance. Secondly, the grafting of hydrophobic groups generates free radicals through the thermal homolytic cleavage of azobisisobutyronitrile (AIBN), selectively abstracting the α-H groups of the PVB molecule to form active sites, which then react with the carbon-carbon bonds of acrylates and fluorinated monomers. The double bonds undergo a free radical addition reaction to form a structure of PVB backbone and hydrophobic side chains. The steric hindrance effect prevents water molecules from contacting the hydroxyl groups, while the fluorinated side chains further reduce the molecular surface energy and enhance hydrophobicity. Finally, crosslinking modification utilizes the -NCO group of hexamethylene diisocyanate to undergo a nucleophilic addition reaction with the residual hydroxyl oxygen of PVB to generate urethane bonds. This crosslinks the linear PVB molecules to construct a dense three-dimensional network structure, significantly increasing the crosslinking density, reducing coating porosity defects, and improving the coating's water and alkali resistance, thereby enhancing its anti-corrosion and weather resistance. Among them, Comparative Example 1, due to the omission of hydrophobic grafting modification and the lack of introduction of fluorinated and methacrylate hydrophobic side chains, has a high surface free energy of resin and cannot form an effective hydrophobic barrier layer, resulting in easy penetration of corrosive media, accelerated coating aging, and poor compatibility with fillers; Comparative Example 2, due to the omission of crosslinking modification and the lack of formation of a three-dimensional network structure, has insufficient coating density and mechanical stability, many pores, rapid penetration of corrosive media, and is prone to swelling, powdering, and molecular chain degradation; Comparative Example 3, due to the use of unmodified montmorillonite instead of organically modified montmorillonite, has poor compatibility between hydrophilic montmorillonite and resin, is prone to agglomeration and forming penetration channels, cannot construct an effective sheet-like barrier structure, and has weak interfacial bonding. Ultimately, the water resistance, acid and alkali resistance, corrosion resistance, and weather resistance of all three examples are significantly inferior to those of the examples.
[0103] It should be understood that the above are only some embodiments of the present invention. It should be pointed out that for those skilled in the art, other modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.
Claims
1. A PVB resin-based anti-corrosion and weather-resistant coating, characterized in that, Including modified PVB resin, acrylic emulsion, composite filler, silicone oil, silane coupling agent, film-forming aid, photoinitiator and deionized water; The composite filler is a mixture of talc, kaolin, wollastonite, organically modified montmorillonite, and nano-SiO2. The modified PVB resin is obtained by using PVA as raw material, through acetalization, hydrophobic grafting of fluorinated monomers, and crosslinking with isocyanate.
2. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 1, characterized in that, The mass ratio of the modified PVB resin, acrylic emulsion, composite filler, silicone oil, silane coupling agent, film-forming aid, photoinitiator, and deionized water is (30-40):(15-25):(18-25):(5-8):(1-2):(5-8):(3-5):(10-15); the mass ratio of talc, kaolin, wollastonite, organically modified montmorillonite, and nano-SiO2 in the composite filler is 6:3:9:(2-3):(1-2); the organically modified montmorillonite is montmorillonite modified with hexadecyltrimethylammonium bromide.
3. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 1, characterized in that, The silane coupling agent includes any one of KH-550, KH-560, and KH-570; the film-forming aid includes any one of propylene glycol methyl ether acetate, propylene glycol ethyl ether, and dipropylene glycol methyl ether; and the photoinitiator includes any one of photoinitiator 1173, photoinitiator 184, and photoinitiator TPO.
4. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 1, characterized in that, The preparation of the modified PVB resin includes the following steps: T1: PVA and n-butyraldehyde are added to an ethanol solution, sulfonated activated carbon solid acid is added, and the mixture is reacted at 7-9℃ for 10-12 hours to obtain acetal PVB resin. T2: Methyl methacrylate, fluorinated acrylate and azobisisobutyronitrile are added sequentially to acetal PVB resin and reacted in an oil bath at 80-85℃ for 4-5 hours to obtain graft copolymer. T3: Add an isocyanate crosslinking agent to the graft copolymer and react at 55-60℃ for 1-2 hours to obtain modified PVB resin.
5. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 4, characterized in that, In T1, the sulfonated activated carbon solid acid is prepared by sulfonation modification of activated carbon with concentrated sulfuric acid, with a sulfonic acid group loading of ≥1.0 mmol / g and a water content of ≤1%; the mass ratio of PVA, n-butyraldehyde and sulfonated activated carbon solid acid is 100:70:(2-3); the volume ratio of ethanol to water in the ethanol solution is 1.1:
1.
6. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 4, characterized in that, In T2, the mass ratio of the acetal PVB resin, methyl methacrylate, fluorinated acrylate, and azobisisobutyronitrile is 100:30:15:(0.2-0.9); the fluorinated acrylate includes any one of tridecafluorooctyl acrylate, perfluorodecyl acrylate, and trifluoroethyl methacrylate.
7. The anti-corrosion and weather-resistant coating based on PVB resin according to claim 4, characterized in that, In T3, the mass ratio of the graft copolymer to the isocyanate crosslinking agent is (11-15):1; the isocyanate crosslinking agent includes any one of hexamethylene diisocyanate, toluene diisocyanate and isophorone diisocyanate.
8. A method for preparing a PVB resin-based anti-corrosion and weather-resistant coating as described in claim 1, characterized in that, Includes the following steps: S1: Add modified PVB resin and acrylic emulsion to a dispersion tank and stir to obtain a mixed base material; S2: Add composite filler to the mixed base material, disperse under high shear, and then treat with ultrasound to obtain a premixed liquid; S3: Add organosilicon oil, silane coupling agent, film-forming aid, photoinitiator and deionized water to the premix in sequence, continue stirring, and filter to obtain a PVB resin-based anti-corrosion and weather-resistant coating.
9. The method for preparing a PVB resin-based anti-corrosion and weather-resistant coating according to claim 8, characterized in that, In S1, the stirring conditions are: rotation speed 1300-1500 r / min, stirring time 30-60 min.
10. The method for preparing a PVB resin-based anti-corrosion and weather-resistant coating according to claim 8, characterized in that, In S2, the high-shear dispersion conditions are: rotation speed 2500-3500 r / min, dispersion time 30-45 min; the ultrasonic conditions are: power 200-250 W, ultrasonic time 20-30 min; in S3, the stirring conditions are: rotation speed 300-500 r / min, stirring time 1-3 h.