A weather-resistant fluorocarbon coated door and window and its preparation method

Abstract

This application relates to the field of building materials, specifically disclosing a weather-resistant fluorocarbon coated door and window and its preparation method; a weather-resistant fluorocarbon coated door and window includes door and window profiles, an epoxy modified primer, and a FEVE fluorocarbon topcoat, wherein the FEVE fluorocarbon topcoat includes the following raw materials in parts by weight: 40-60 parts of fluoroethylene-vinyl ether copolymer, 5-10 parts of nano-cerium oxide, 5-10 parts of nano-titanium dioxide, 5-8 parts of coupling agent, 5-8 parts of curing agent, 0.5-1 part of defoamer, 0.5-1 part of dispersant, and 0.5-1 part of leveling agent; this application uses a combination of epoxy modified primer and FEVE fluorocarbon topcoat to synergistically enhance the weather resistance of the coating.

Description

Technical Field

[0001] This application relates to the field of building materials, and in particular to a weather-resistant fluorocarbon coated door and window and its preparation method. Background Technology

[0002] Current surface treatment technologies for building doors and windows mainly include anodizing, powder coating, and ordinary fluorocarbon coating. Anodizing technology forms an oxide film on the surface of aluminum through electrolysis, which has good hardness and corrosion resistance, but the color is limited and it is susceptible to acid and alkali corrosion. Powder coating technology uses electrostatic adsorption of powder coating and high temperature curing, which provides rich colors but has poor weather resistance and is prone to chalking and fading when exposed to ultraviolet light for a long time. Although ordinary fluorocarbon coating has good weather resistance and self-cleaning properties, the coating adhesion is weak and it is prone to cracking and peeling in environments with large temperature differences.

[0003] In existing technologies, the following three solutions are commonly used to address the weather resistance issue of door and window surfaces: First, multi-layer composite coating technology, which improves protective performance by layering primer, intermediate coat, and topcoat, but suffers from complex processes and high costs; second, modified coatings with added nanomaterials, such as nano-silica-reinforced fluorocarbon coatings, which can improve hardness but have poor dispersibility and are prone to uneven coating; and third, polyvinylidene fluoride (PVDF) resin-based coatings, which have excellent chemical corrosion resistance, but require a special primer and have a narrow application temperature range. Summary of the Invention

[0004] To address the problem of insufficient weather resistance of existing door and window surfaces, this application provides a weather-resistant fluorocarbon coated door and window and its preparation method.

[0005] In a first aspect, this application provides a weather-resistant fluorocarbon coated door and window, employing the following technical solution: A weather-resistant fluorocarbon coated door and window includes door and window profiles, an epoxy modified primer, and a FEVE fluorocarbon topcoat. The FEVE fluorocarbon topcoat comprises the following raw materials in parts by weight: 40-60 parts of fluoroethylene-vinyl ether copolymer, 5-10 parts of nano-cerium oxide, 5-10 parts of nano-titanium dioxide, 5-8 parts of coupling agent, 5-8 parts of curing agent, 0.5-1 part of defoamer, 0.5-1 part of dispersant, and 0.5-1 part of leveling agent.

[0006] By adopting the above technical solution, using modified FEVE fluorocarbon topcoat in combination with epoxy modified primer, the epoxy primer can enhance the corrosion resistance of the coating substrate, and the FEVE fluorocarbon topcoat can enhance the chemical barrier and hardness of the top layer, thereby improving the corrosion resistance and scratch resistance of the door and window coating. The prepared door and window coating system has good weather resistance and durability, and reduces the aging of the door and window coating.

[0007] Fluorinated vinyl ether copolymers enable topcoat coatings to withstand prolonged outdoor exposure, reducing degradation and yellowing of window and door coatings. Introducing nano-cerium oxide and nano-titanium dioxide into FEVE fluorocarbon topcoats, and utilizing the anchoring effect of coupling agents on chemical bonds, allows for inorganic-organic hybridization of the FEVE fluorocarbon resin, extending the UV protection performance of the topcoat.

[0008] Preferably, the epoxy modified primer includes component A and component B. Component A includes the following raw materials in parts by weight: 30-40 parts of acrylic hybrid epoxy emulsion, 10-20 parts of water, 5-8 parts of nano alumina, and 5-8 parts of glass fiber.

[0009] By adopting the above technical solution, acrylate monomers are grafted onto epoxy resin, which can enhance the adhesion and wettability of the coating to the metal substrate by utilizing epoxy groups. The acrylate segments can enhance the flexibility and impact resistance of the coating, reduce the cracking of the coating when the door and window profiles are subjected to thermal expansion and contraction, reduce the phenomenon of coating chalking, and improve the weather resistance of the coating.

[0010] Nano-alumina and glass fiber can synergistically enhance the strength and impact resistance of the primer, reduce the generation of microcracks and crazing when there are large temperature differences between day and night or between seasons, and improve the corrosion resistance and weather resistance of the coating.

[0011] Preferably, component B is a polyamide curing agent, and the mass ratio of component A to component B is (5-7):1.

[0012] By adopting the above technical solution and using polyamides as curing agents for the primer, a certain number of hydroxyl and amide groups can be retained on the primer surface, enabling cross-linking with the active groups in the topcoat system, reducing coating delamination, and enhancing the coating's density. Simultaneously, polyamides can enhance the primer's flexibility, allowing it to absorb some impact stress, reducing cracking or peeling of window and door coatings due to stress concentration, and improving the corrosion resistance and impact resistance of the coatings. Epoxy groups can form a dense three-dimensional network with amine curing agents, enhancing the coating's adhesion and corrosion resistance.

[0013] Preferably, the preparation method of the acrylic hybrid epoxy emulsion includes the following specific steps: Water, emulsifier, epoxy resin, and polypropylene glycol diglycidyl ether are mixed, heated and stirred until homogeneous. Then, acrylic monomers, initiators, and catalysts are added, and the mixture is heated further to obtain an acrylic hybrid epoxy emulsion.

[0014] Preferably, the heating and stirring temperature is 50-60℃, and the heating and reaction temperature is 80-90℃.

[0015] Preferably, the acrylic hybrid epoxy emulsion comprises the following raw materials in parts by weight: 70-80 parts water, 10-20 parts emulsifier, 50-80 parts epoxy resin, 10-15 parts polypropylene glycol diglycidyl ether, 40-70 parts acrylic monomer, 1-3 parts initiator, and 3-5 parts catalyst.

[0016] By adopting the above technical solution, acrylic monomers and epoxy resins undergo a free radical copolymerization reaction to obtain an acrylic hybrid epoxy emulsion. Polypropylene glycol diglycidyl ether can embed the long chain of polypropylene glycol into the epoxy resin network, improving the flexibility of the epoxy resin. Through the dual action of polypropylene glycol diglycidyl ether and acrylic monomers, the toughness of the primer can be effectively enhanced, preventing the coating from cracking or peeling after being subjected to impact.

[0017] Preferably, the acrylic monomer is methyl methacrylate, methacrylic acid, or glycidyl methacrylate.

[0018] Secondly, this application provides a method for preparing weather-resistant fluorocarbon coated doors and windows, using the following technical solution: A method for preparing weather-resistant fluorocarbon coated doors and windows includes the following specific steps: A FEVE fluorocarbon topcoat is formed by mixing fluoroethylene-vinyl ether copolymer, nano-cerium oxide, nano-titanium dioxide, coupling agent, curing agent, defoamer, dispersant, and leveling agent. The door and window profiles are degreased, ultrasonically cleaned, and then passivated with a passivating solution. After drying, they are first sprayed with epoxy modified primer, then with FEVE fluorocarbon topcoat, and finally heated and cured to produce weather-resistant fluorocarbon coated doors and windows.

[0019] By adopting the above technical solution, and combining passivation treatment with epoxy modified primer and FEVE fluorocarbon topcoat, the prepared coating has high adhesion to the substrate, and the phenomenon of coating peeling and delamination is reduced when exposed to the outdoors for a long time.

[0020] Preferably, the passivation solution is a potassium dichromate passivation solution.

[0021] Preferably, the heating and curing is a segmented curing process, with segmented heating and curing temperatures of 80-90℃, 140-150℃, and 180-190℃.

[0022] By adopting the above technical solution and using a gradient temperature curing process, the resin is fully cross-linked while avoiding thermal stress concentration, thereby enhancing the weather resistance and adhesion of the coating.

[0023] In summary, this application has the following beneficial effects: 1. This application combines an epoxy-modified primer and a FEVE fluorocarbon topcoat to synergistically enhance the coating's weather resistance. The fluoroethylene-vinyl ether copolymer enhances the topcoat's aging resistance, enabling the coating to withstand prolonged outdoor exposure. Introducing nano-cerium oxide and nano-titanium dioxide into the FEVE fluorocarbon topcoat creates an inorganic-organic hybrid structure, extending the topcoat's UV protection performance and reducing coating degradation and peeling.

[0024] 2. In this application, acrylic monomers are grafted onto epoxy resin, utilizing the flexible segments of acrylic acid to enhance the flexibility and impact resistance of the primer, reducing cracking of the primer during thermal expansion and contraction of door and window profiles. Nano-alumina and glass fiber can synergistically enhance the strength and impact resistance of the primer, reducing the formation of microcracks and crazing when there are large temperature differences between day and night or between seasons. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments.

[0026] All raw materials used in the examples are commercially available. Example Example 1

[0027] This embodiment provides a weather-resistant fluorocarbon coated door and window, including door and window profiles, an epoxy modified primer, and a FEVE fluorocarbon topcoat. The FEVE fluorocarbon topcoat comprises the following raw materials in parts by weight: 50 kg of fluoroethylene-vinyl ether copolymer, 8 kg of nano-cerium oxide, 8 kg of nano-titanium dioxide, 7 kg of coupling agent, 7 kg of curing agent, 0.8 kg of defoamer, 0.8 kg of dispersant, and 0.8 kg of leveling agent. The fluoroethylene-vinyl ether copolymer is purchased from Daikin Fluorochemicals (Guangzhou) Branch. The average particle size of the nano-cerium oxide is 30 nm, the average particle size of the nano-titanium dioxide is 50 nm, the coupling agent is KH570, the curing agent is [not specified], the defoamer is BYK-057, the dispersant is FC-4430, and the leveling agent is BYK-310.

[0028] The epoxy modified primer consists of component A and component B. Component A includes the following raw materials by weight: 35 kg of acrylic hybrid epoxy emulsion, 15 kg of water, and 7 kg of nano-alumina with an average particle size of 50 nm. Component B is polyamide 650. The mass ratio of component A to component B is 6:1.

[0029] The acrylic hybrid epoxy emulsion comprises the following raw materials in parts by weight: 75 kg water, 15 kg emulsifier, 65 kg epoxy resin, 13 kg polypropylene glycol diglycidyl ether, 55 kg acrylic monomers, 2 kg initiator, and 4 kg catalyst. The epoxy resin is E-51, the emulsifier is OP-10, the polypropylene glycol diglycidyl ether is PPGDGE-207, the initiator is ammonium persulfate, the catalyst is sodium bicarbonate, and the acrylic monomers are methyl methacrylate, methacrylic acid, and glycidyl methacrylate, with a mass ratio of methyl methacrylate, methacrylic acid, and glycidyl methacrylate of 1:1:1:1.

[0030] The preparation method of weather-resistant fluorocarbon coated doors and windows includes the following specific steps: S1: Mix fluoroethylene-vinyl ether copolymer, nano-cerium oxide, nano-titanium dioxide, coupling agent, curing agent, defoamer, dispersant, and leveling agent to form FEVE fluorocarbon topcoat.

[0031] S2: Mix water, emulsifier, epoxy resin, and polypropylene glycol diglycidyl ether, heat to 55°C and stir until homogeneous, then add acrylic monomer, initiator, and catalyst, and continue heating to 85°C for 2 hours to obtain acrylic hybrid epoxy emulsion. Mix the acrylic hybrid epoxy emulsion with water and nano alumina until homogeneous to obtain component A. Mix component A with component B until homogeneous to obtain epoxy modified primer.

[0032] S3: After degreasing the door and window profiles, ultrasonically clean them, then immerse them in potassium dichromate passivation solution for 90 seconds (the concentration of potassium dichromate passivation solution is 15g / L). After drying, first spray epoxy modified primer, level for 5 minutes, then spray FEVE fluorocarbon topcoat, and cure at 85℃, 145℃, and 185℃ in sequence to produce weather-resistant fluorocarbon coated doors and windows.

[0033] Example 2

[0034] The difference between Example 2 and Example 1 is that the FEVE fluorocarbon topcoat includes the following raw materials in parts by weight: 40 kg of fluoroethylene-vinyl ether copolymer, 5 kg of nano cerium oxide, 10 kg of nano titanium dioxide, 5 kg of coupling agent, 8 kg of curing agent, 0.5 kg of defoamer, 1 kg of dispersant, and 0.5 kg of leveling agent.

[0035] Example 3 The difference between Example 3 and Example 1 is that the FEVE fluorocarbon topcoat includes the following raw materials in parts by weight: 60 kg of fluoroethylene-vinyl ether copolymer, 10 kg of nano cerium oxide, 5 kg of nano titanium dioxide, 8 kg of coupling agent, 5 kg of curing agent, 1 kg of defoamer, 0.5 kg of dispersant, and 1 kg of leveling agent.

[0036] Example 4 The difference between Example 4 and Example 1 is that the epoxy modified primer component A includes the following raw materials in parts by weight: 35 kg of acrylic hybrid epoxy emulsion, 15 kg of water, 7 kg of nano alumina, and 7 kg of glass fiber with an average diameter of 5 μm.

[0037] The preparation method of weather-resistant fluorocarbon coated doors and windows includes the following specific steps: S1: Mix fluoroethylene-vinyl ether copolymer, nano-cerium oxide, nano-titanium dioxide, coupling agent, curing agent, defoamer, dispersant, and leveling agent to form FEVE fluorocarbon topcoat.

[0038] S2: Mix water, emulsifier, epoxy resin, and polypropylene glycol diglycidyl ether, heat to 55°C and stir until homogeneous, then add acrylic monomers, initiator, and catalyst, and continue heating to 85°C for 2 hours to obtain an acrylic hybrid epoxy emulsion. Mix the acrylic hybrid epoxy emulsion with water, nano-alumina, and glass fiber until homogeneous to obtain component A. Mix component A with component B until homogeneous to obtain an epoxy modified primer.

[0039] S3: After degreasing the door and window profiles, ultrasonically clean them, then immerse them in potassium dichromate passivation solution for 90 seconds (the concentration of potassium dichromate passivation solution is 15g / L). After drying, first spray epoxy modified primer, level for 5 minutes, then spray FEVE fluorocarbon topcoat, and cure at 85℃, 145℃, and 185℃ in sequence to produce weather-resistant fluorocarbon coated doors and windows.

[0040] Example 5 The difference between Example 5 and Example 4 is that the epoxy modified primer component A includes the following raw materials in parts by weight: 30 kg of acrylic hybrid epoxy emulsion, 20 kg of water, 5 kg of nano alumina, and 8 kg of glass fiber.

[0041] Example 6 The difference between Example 6 and Example 4 is that the epoxy modified primer component A includes the following raw materials in parts by weight: 40 kg of acrylic hybrid epoxy emulsion, 10 kg of water, 8 kg of nano alumina, and 5 kg of glass fiber.

[0042] Example 7 The difference between Example 7 and Example 4 is that the acrylic hybrid epoxy emulsion includes the following raw materials in parts by weight: 70 kg water, 10 kg emulsifier, 50 kg epoxy resin, 15 kg polypropylene glycol diglycidyl ether, 40 kg acrylic monomer, 1 kg initiator, and 3 kg catalyst.

[0043] Example 8 The difference between Example 8 and Example 4 is that the acrylic hybrid epoxy emulsion includes the following raw materials in parts by weight: 80 kg of water, 20 kg of emulsifier, 80 kg of epoxy resin, 10 kg of polypropylene glycol diglycidyl ether, 70 kg of acrylic monomer, 3 kg of initiator, and 5 kg of catalyst.

[0044] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the weather-resistant fluorocarbon coated doors and windows do not use epoxy modified primer.

[0045] The preparation method of weather-resistant fluorocarbon coated doors and windows includes the following specific steps: A FEVE fluorocarbon topcoat is formed by mixing fluoroethylene-vinyl ether copolymer, nano-cerium oxide, nano-titanium dioxide, coupling agent, curing agent, defoamer, dispersant, and leveling agent.

[0046] After degreasing and ultrasonic cleaning, the door and window profiles are then immersed in a potassium dichromate passivation solution with a concentration of 15 g / L for 90 seconds for passivation treatment. After drying, FEVE fluorocarbon topcoat is sprayed on and then cured sequentially at 85℃, 145℃, and 185℃ to produce weather-resistant fluorocarbon coated doors and windows.

[0047] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that nano-titanium dioxide is not used in the FEVE fluorocarbon topcoat raw material.

[0048] Performance testing The weather-resistant fluorocarbon coated doors and windows provided in Examples 1-8 and Comparative Examples 1-2 of this application were subjected to the following performance tests, and the specific test results are shown in Table 1.

[0049] Detection methods I. Weather resistance The salt spray resistance of the fluorocarbon coated doors and windows prepared in this application was tested in accordance with the standard GB / T17748-2016 "Aluminum Composite Panels for Building Curtain Walls". The water resistance of the fluorocarbon coated doors and windows prepared in this application was tested in accordance with the standard GB / T1733-1993 "Determination of Water Resistance of Paint Film".

[0050] II. Adhesion Referring to the standard GB / T9286-2021 "Cross-cut test for paints and varnishes", the adhesion effect of the fluorocarbon coated doors and windows prepared in this application was tested after 100 cycles at -40℃ and 80℃.

[0051] III. Hardness The hardness of the fluorocarbon coated door and window coating prepared in this application was tested in accordance with the standard GB / T6739—2006 "Determination of film hardness by pencil method for paints and varnishes".

[0052] Table 1: Performance Test Results Data Table

[0053] The performance test results show that the weather-resistant fluorocarbon coated doors and windows prepared in this application can maintain good weather resistance in salt spray test and water resistance test. By comparing Comparative Examples 1-2 and Example 1, it can be seen that Comparative Example 1 does not use epoxy modified primer, and Comparative Example 2 changes the raw material composition in FEVE fluorocarbon topcoat. The performance test results show that the weather resistance of the prepared coatings is significantly reduced. Although using a single FEVE fluorocarbon topcoat can maintain good hardness, the weather resistance of the coating decreases significantly after long-term outdoor exposure, and the adhesion between the coating and the substrate is also reduced.

[0054] A comparison of Example 4 and Example 1 shows that the coating prepared by the epoxy-modified primer raw material composition used in Example 4 reduces the generation of cracks and enhances the corrosion resistance and aging resistance of the coating.

[0055] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A weather-resistant fluorocarbon coated door and window, characterized in that, The product includes door and window profiles, epoxy modified primer, and FEVE fluorocarbon topcoat. The FEVE fluorocarbon topcoat comprises the following raw materials in parts by weight: 40-60 parts of fluoroethylene-vinyl ether copolymer, 5-10 parts of nano-cerium oxide, 5-10 parts of nano-titanium dioxide, 5-8 parts of coupling agent, 5-8 parts of curing agent, 0.5-1 part of defoamer, 0.5-1 part of dispersant, and 0.5-1 part of leveling agent.

2. The weather-resistant fluorocarbon coated door and window according to claim 1, characterized in that, The epoxy modified primer comprises component A and component B. Component A comprises the following raw materials in parts by weight: 30-40 parts acrylic hybrid epoxy emulsion, 10-20 parts water, 5-8 parts nano alumina, and 5-8 parts glass fiber.

3. The weather-resistant fluorocarbon coated door and window according to claim 2, characterized in that, Component B is a polyamide curing agent, and the mass ratio of component A to component B is (5-7):

1.

4. The weather-resistant fluorocarbon coated door and window according to claim 2, characterized in that, The preparation method of the acrylic hybrid epoxy emulsion includes the following specific steps: Water, emulsifier, epoxy resin, and polypropylene glycol diglycidyl ether are mixed, heated and stirred until homogeneous. Then, acrylic monomers, initiators, and catalysts are added, and the mixture is heated further to obtain an acrylic hybrid epoxy emulsion.

5. The weather-resistant fluorocarbon coated door and window according to claim 4, characterized in that, The heating and stirring temperature is 50-60℃, and the heating and reaction temperature is 80-90℃.

6. The weather-resistant fluorocarbon coated door and window according to claim 4, characterized in that, The acrylic hybrid epoxy emulsion comprises the following raw materials in parts by weight: 70-80 parts water, 10-20 parts emulsifier, 50-80 parts epoxy resin, 10-15 parts polypropylene glycol diglycidyl ether, 40-70 parts acrylic monomer, 1-3 parts initiator, and 3-5 parts catalyst.

7. The weather-resistant fluorocarbon coated door and window according to claim 6, characterized in that, The acrylic monomers are methyl methacrylate, methacrylic acid, and glycidyl methacrylate.

8. A method for preparing weather-resistant fluorocarbon coated doors and windows as described in any one of claims 1-7, characterized in that, The specific steps include the following: A FEVE fluorocarbon topcoat is formed by mixing fluoroethylene-vinyl ether copolymer, nano-cerium oxide, nano-titanium dioxide, coupling agent, curing agent, defoamer, dispersant, and leveling agent. The door and window profiles are degreased, ultrasonically cleaned, and then passivated with a passivating solution. After drying, they are first sprayed with epoxy modified primer, then with FEVE fluorocarbon topcoat, and finally heated and cured to produce weather-resistant fluorocarbon coated doors and windows.

9. The method for preparing weather-resistant fluorocarbon coated doors and windows according to claim 8, characterized in that, The passivation solution is a potassium dichromate passivation solution.

10. The method for preparing weather-resistant fluorocarbon coated doors and windows according to claim 8, characterized in that, The heating and curing process is a segmented curing process, with segmented heating and curing temperatures of 80-90℃, 140-150℃, and 180-190℃.

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