Salt-fog-resistant aluminum coating fabric and production process

Abstract

The invention relates to the technical field of coatings, in particular to a salt-fog-resistant aluminum coating fabric and a production process. The salt-fog-resistant aluminum coating fabric comprises the following raw materials in parts by weight: a basic fabric: 15-32 parts of polyester fibers, 12-28 parts of nylon fibers, 8-22 parts of glass beads and 25-65 parts of modified water-based acrylate emulsion; the spraying solution comprises the following components in parts by weight: 15-30 parts of graphene zinc powder, 12-23 parts of modified epoxy resin, 8-16 parts of an epoxy curing agent, 5-12 parts of polyether alcohol, 2-4 parts of a silane coupling agent, 21-36 parts of aluminum powder and 4-16 parts of hydroxyethyl cellulose. The prepared salt-fog-resistant aluminum coating fabric has excellent high-temperature oxidation resistance and stripping resistance, is excellent in performance as a roller shutter in a severe environment, and is good in scene penetrating effect, high in adhesion, good in reflection effect and good in corrosion resistance when being applied to the roller shutter.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and more particularly to a salt spray resistant aluminum coating fabric and a production process thereof. Background Art

[0002] Highly reflective fabric is a material that improves visibility and protection by reflecting light. It is a functional auxiliary blackout fabric and is usually used together with other fabrics to cover objects to avoid contact with strong light. It has the effect of blocking strong light and ultraviolet rays. Highly reflective fabric usually has a reflectivity of more than 90%, which can reflect most of the light back to the direction of the light source, thereby providing higher visibility in low-light environments. This type of fabric often uses advanced materials such as high-refractive index glass beads, reflective coatings or micro-beaded glass to ensure that it can effectively reflect light under various lighting conditions. Highly reflective fabrics usually have good wear resistance and aging resistance, and can maintain their reflective properties even after multiple washings or long-term use. Highly reflective fabrics are widely used in construction, automobiles, railways, roads, industry and other fields for thermal insulation and cooling, reducing heat transfer and improving safety.

[0003] In the existing technology, high reflective fabrics usually use nano-scale titanium dioxide, aluminum oxide, zinc oxide and other reflective particles. These materials have high refractive index and high reflectivity and can effectively reflect light. At present, there is a problem that the adhesion performance of different substrates is limited, resulting in the limited applicability of the coating in different application scenarios. Aluminum is attached to the fabric in the form of aluminum atoms, such as Figure 1 As shown, the adhesion effect is relatively poor and it can be scraped off by just scraping. The aluminum atoms are easily oxidized and the surface becomes dark over time. Summary of the Invention

[0004] The present invention provides a salt-fog-resistant aluminum-coated fabric and production process. The resulting salt-fog-resistant aluminum-coated fabric effectively isolates the aluminum substrate from salt-fog corrosion, extending its service life. The resulting salt-fog-resistant aluminum-coated fabric exhibits excellent high-temperature oxidation resistance and peeling resistance, making it an excellent performer for use as a roller blind in harsh environments. The salt-fog-resistant aluminum-coated fabric exhibits excellent transparency, strong adhesion, good reflectivity, and excellent corrosion resistance.

[0005] In a first aspect, the present invention provides a salt spray resistant aluminum coated fabric, comprising the following raw materials in parts by weight: Base fabric: 15-32 parts polyester fiber, 12-28 parts nylon fiber, 8-22 parts glass microbeads, 25-65 parts modified water-based acrylic emulsion; Spraying solution: 15-30 parts of graphene zinc powder, 12-23 parts of modified epoxy resin, 8-16 parts of epoxy curing agent, 5-12 parts of polyether alcohol, 2-4 parts of silane coupling agent, 21-36 parts of aluminum powder, 4-16 parts of hydroxyethyl cellulose.

[0006] The spray solution is prepared using graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder, and hydroxyethyl cellulose. The graphene zinc powder coating, leveraging graphene's high conductivity and shielding effect, effectively reduces the penetration rate of corrosive media, thereby improving the coating's corrosion resistance. Graphene acts as a "conductive bridge" within the coating, forming a conductive network with the zinc powder, ensuring the zinc powder's ability to provide sustained cathodic protection as a sacrificial anode. When the zinc powder corrodes, the graphene-connected zinc powder continues to provide an electron transport pathway, maintaining the coating's protective properties. The epoxy groups (-O-CH2-CH2-O) in the epoxy resin undergo a ring-opening reaction with the active groups in the curing agent to form an intermediate. This intermediate further cross-links with other curing agent molecules or epoxy resin molecules to form a three-dimensional network structure. This process typically involves the formation of covalent CO and C-N bonds, enhancing the material's mechanical properties and heat resistance. As a surfactant, polyether alcohol contains both hydrophobic and hydrophilic groups in its molecular structure, which can reduce the surface tension of the solution, thereby increasing the solubility of organic matter in the solution and making the spray material more uniform. Polyether alcohol adjusts the viscosity of the spray solution, improving its fluidity and thixotropic properties during the spraying process, thereby ensuring spray uniformity.

[0007] Silane coupling agents are added to the spray solution. Their interface modification mechanism in the spray solution is primarily based on their "amphiphilic" structure and chemical reactivity. Silane coupling agents typically possess both hydrophilic groups (such as alkoxy groups) and hydrophobic groups (such as organic groups). They react chemically with hydroxyl groups on the surface of inorganic materials to form stable covalent bonds, thereby enhancing the interfacial bonding between the inorganic and organic materials. The silane coupling agent allows aluminum powder and graphene zinc powder to bond more tightly to the organic material, increasing the peel strength of the aluminum powder.

[0008] Aluminum powder added to the spray solution forms a dense protective film on surfaces, effectively isolating them from air and moisture, enhancing their corrosion resistance. Aluminum powder also exhibits excellent heat-reflecting properties, reflecting infrared sunlight, providing insulation and heat dissipation, making it suitable for protection in high-temperature environments. This makes salt-spray-resistant aluminum-coated fabrics particularly reflective when used in roller blinds.

[0009] The rheological properties of hydroxyethyl cellulose in spray solutions are primarily reflected in its unique rheological properties. Hydroxyethyl cellulose is a nonionic, water-soluble polymer with excellent thickening, suspension, and rheological control capabilities. During the spraying process, hydroxyethyl cellulose forms a network structure, improving the fluidity and leveling of the solution, thereby reducing spatter and improving coating uniformity. Hydroxyethyl cellulose can be combined with polyether alcohols, which improve wettability. This combination achieves high atomization efficiency and low spatter in spray solutions.

[0010] Preferably, the modified aqueous acrylate emulsion is prepared by reacting menthol and acryloyl chloride to obtain menthol-structured acrylate, and then the menthol-structured acrylate and styrene monomer are polymerized and stirred under the emulsification action of sodium lauryl sulfate to obtain a polyacrylate nanoparticle modified emulsion, wherein the mass ratio of menthol to acryloyl chloride is 1-3:1-8.

[0011] Through the above scheme, the acrylate monomer in the modified waterborne acrylate emulsion is typically produced by the reaction of acryloyl chloride and menthol in the presence of a catalyst (such as triethylamine), exhibiting high reactivity. Acrylate monomers are highly reactive and can react with a wide range of compounds, such as amines, alcohols, and acids, exhibiting typical acyl chloride reactivity. Menthol and acryloyl chloride undergo an esterification reaction to produce an acrylate ester with a menthol structure. The hydroxyl group (-OH) of menthol and the acyl chloride group (-COCl) of acryloyl chloride undergo a nucleophilic substitution reaction catalyzed by triethylamine (Et3N) to produce the acrylate monomer.

[0012] Preferably, the particle size of the glass microbeads is 20-45 μm.

[0013] Through the above scheme, glass microbeads are mixed with an adhesive to form a coating slurry, which is then applied to the fabric surface to form a reflective layer. Glass microbeads are often used as reinforcing fillers in textile materials due to their high hardness and wear resistance. Acrylic ester emulsion can be used as a binder to evenly disperse the glass microbeads in the fiber matrix to form a composite material. Acrylic ester emulsion can improve the interfacial bonding between the glass microbeads and the fibers, thereby enhancing the overall mechanical properties of the composite material. The acrylic ester emulsion acts as a binder, tightly bonding the glass microbeads and fibers, improving the material's strength and wear resistance. The acrylic ester emulsion imparts good transparency, flexibility, and weather resistance to the material, while the glass microbeads and polyester / nylon fibers provide structural support and wear resistance.

[0014] Preferably, the graphene zinc powder is prepared by mixing graphene oxide with zinc powder, and the mass ratio of the graphene to the zinc powder is 1-5:1-2.

[0015] Through this approach, graphene's two-dimensional sheet structure and high conductivity form a conductive network that synergizes with zinc powder to provide long-lasting cathodic protection and significantly enhance the coating's salt spray resistance. Graphene's strong conductivity and physical shielding properties effectively block the penetration of corrosive media, while forming a conductive pathway with the zinc powder, enhancing the coating's corrosion resistance. Graphene's excellent interfacial adhesion allows for a better bond with epoxy resin, thereby increasing the coating's density, reducing porosity, and enhancing its permeability resistance.

[0016] Preferably, the modified epoxy resin is prepared by mixing 1,4-dichlorobenzyl and 4-vinylbenzyl chloride with epoxy resin, and the mass ratio of the 1,4-dichlorobenzyl and 4-vinylbenzyl chloride is 1:1-2.

[0017] The above scheme reveals that the reaction mechanism of 1,4-(p-dichlorobenzyl) chloride with epoxy resins primarily relates to its properties as an organic synthesis intermediate. 1,4-(p-dichlorobenzyl) chloride is an aromatic compound containing two chloromethyl groups and can participate in organic synthesis through substitution or condensation reactions. During the curing process of epoxy resins, the epoxy group typically undergoes a ring-opening reaction with a nucleophilic reagent (such as an amine or alcohol). 1,4-(p-dichlorobenzyl) chloride may participate in the crosslinking reaction of epoxy resins through its chloromethyl group, acting as a reactive center. The two chloromethyl groups of 1,4-(p-dichlorobenzyl) chloride act as nucleophiles, undergoing nucleophilic substitution reactions with the epoxy groups in the epoxy resin, forming stable carbon-carbon bonds and promoting curing and crosslinking of the epoxy resin. Furthermore, 1,4-(p-dichlorobenzyl) chloride can act as a hydrogen bond acceptor or ligand, participating in the construction of supramolecular structures and further enhancing the properties of the epoxy resin. The reaction mechanism of 4-vinylbenzyl chloride with epoxy resins primarily relates to the chemical properties of its vinyl and benzyl chloride groups. 4-Vinylbenzyl chloride has a polymerization-reactive vinyl group and a benzyl chloride group that acts as a good leaving group in nucleophilic substitution reactions. When reacting with epoxy resin, the epoxy group in the epoxy resin typically acts as an electrophile, undergoing nucleophilic substitution with the chlorine atom in 4-vinylbenzyl chloride, forming a new carbon-chlorine bond and releasing HCl. Furthermore, the vinyl group of 4-vinylbenzyl chloride may further participate in the polymerization reaction, thereby enhancing the crosslinking and performance of the epoxy resin. By synergistically modifying the processing conditions of epoxy resins, 1,4-(p-dichlorobenzyl)chloride and 4-vinylbenzyl chloride can be introduced to improve their properties. First, as an organic synthesis intermediate, 1,4-(p-dichlorobenzyl)chloride can be used to synthesize products such as p-phenylenediol. Furthermore, it can serve as a structural group in epoxy resin modification, enhancing its chemical stability and thermal properties. Second, as a vinyl monomer, 4-vinylbenzyl chloride can improve the wettability and adhesion of epoxy resins to polyethylene fibers, modifying processing techniques, and thus improving the performance of composite materials.

[0018] Preferably, the epoxy curing agent is one or more of aliphatic diamine, organic acid anhydride, diethylenetriamine, 2-ethyl-4-methylimidazole and hexahydrophthalic anhydride.

[0019] The epoxy curing agent is a chemical substance used to promote the curing of epoxy resins. Its main function is to chemically react with the epoxy groups in the epoxy resin to form a cross-linked polymer with a three-dimensional network structure, thereby imparting good physical and mechanical properties, chemical stability, and bonding properties to the epoxy resin. By cross-linking with the epoxy groups in the epoxy resin to form a cross-linked structure, the epoxy resin's strength, hardness, and corrosion resistance are improved.

[0020] Preferably, the aluminum powder is in the form of flakes with a particle size of 40-50 μm.

[0021] Through this approach, the scaly structure of the aluminum powder, once dispersed in the carrier, allows it to align parallel to the substrate, forming a continuous metal film, providing excellent hiding power and shielding effects. Aluminum powder exhibits excellent light and heat reflectivity, reflecting visible, ultraviolet, and infrared light. Its scaly structure forms a continuous shielding layer, blocking the intrusion of moisture, oxygen, and ultraviolet light, thereby improving the coating's weather resistance, corrosion resistance, and aging resistance.

[0022] In a second aspect, the present invention provides a production process for a salt spray resistant aluminum coated fabric, comprising the following steps: (1) Polyester fiber and nylon fiber are mixed to prepare a base fabric, and then glass microbeads are attached to the base fabric through a modified water-based acrylic emulsion to prepare a base fabric; (2) mixing graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder and hydroxyethyl cellulose to prepare a spray solution; (3) The spray solution is sprayed on the base fabric by a special spraying method, and the spraying is uniform to obtain a salt spray resistant aluminum coating fabric.

[0023] The above-mentioned method of preparing a matrix by mixing polyester and nylon fibers typically involves combining the two fibers through physical or chemical means to leverage their respective strengths. Polyester fibers offer high wear resistance and dimensional stability, while nylon fibers possess high elongation at break and good fatigue resistance. By combining these two fibers, composite materials with both high strength and high resilience can be prepared. Certain monomers in modified water-based acrylic emulsions possess unique bridged ring structures that form stable hydrogen bonds with the substrate, significantly improving the adhesion of the coating. Furthermore, the introduction of carboxyl functional groups can enhance the electrostatic interaction between the emulsion and the substrate, improving adhesion.

[0024] Preferably, the spraying method is to use a fine needle-type spraying, the nozzle diameter is 1-2mm, the spray gun pressure is 0.25-0.8MPA, the drying conditions are to stand at 80-100℃ for 30-50min, then heat to 200-240℃ and stand for 40-60min, and naturally cure indoors for 20-24h. The special spraying method is to spray in a dot-like layer.

[0025] Through the above scheme, silane coupling agents have a significant positive impact on coating adhesion. By reacting with hydroxyl groups or water on the substrate surface to form silanol groups, silane coupling agents can form covalent bonds (such as Si—O—M) or hydrogen bonds with inorganic materials, thereby strengthening the adhesion between the coating and the substrate. The organic functional groups of silane coupling agents can also react with polymer resins to form stable chemical bonds, further improving the adhesion of the coating. Aluminum powder preferentially undergoes oxidation in corrosive environments, forming a dense aluminum oxide film (Al2O3). This film has excellent corrosion resistance and can slow the progress of corrosion reactions.

[0026] In a third aspect, the present invention provides an application of a salt spray resistant aluminum coating fabric in a high-reflective energy-saving roller blind.

[0027] In summary, the present invention has the following beneficial effects: 1. Menthol is added to the modified water-based acrylate emulsion of this invention. The triterpene ring structure in the menthol molecule imparts strong hydrophobicity. After the acrylate is introduced through an esterification reaction, the resulting product (e.g., L-menthol acrylate) exhibits both hydrophobicity and reactivity. This structural property enhances the emulsion's film-forming properties and imparts additional functions such as antibacterial and cooling properties to base fabrics.

[0028] 2. The graphene zinc powder of the present invention can be combined with the modified epoxy resin to achieve synergistic effects. The graphene has an ultra-high aspect ratio, excellent electrical conductivity, excellent chemical stability, and ultra-high density. The ultra-high aspect ratio creates a "maze effect" in the coating, increasing the density of the coating. The excellent electrical conductivity forms a conductive loop with the zinc powder in the coating, improving the utilization rate of the zinc powder.

[0029] 3. The salt-fog-resistant aluminum-coated fabric produced by the present invention effectively isolates the aluminum substrate from salt-fog corrosion, extending its service life. The resulting salt-fog-resistant aluminum-coated fabric exhibits excellent high-temperature oxidation resistance and peeling resistance, performing well as a roller blind in harsh environments. The salt-fog-resistant aluminum-coated fabric exhibits excellent transparency, strong adhesion, good reflectivity, and excellent corrosion resistance.

[0030] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not intended to limit the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an effect diagram of aluminum being attached to the fabric in the form of aluminum atoms in the prior art; Figure 2 This is a product diagram of the salt spray resistant aluminum coating fabric produced by the present invention; Figure 3 This is a rendering of the salt spray resistant aluminum coating fabric prepared by the present invention being applied to a roller blind; Figure 4 It is a schematic diagram of the spraying method of the salt spray resistant aluminum coating prepared by the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the examples. It is particularly noted that if no specific conditions are specified in the following examples, the reactions were carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources. Example

[0033] Example 1, a salt spray resistant aluminum coating fabric, comprising the following raw materials in parts by weight: Base fabric: 15 parts polyester fiber, 12 parts nylon fiber, 8 parts glass microbeads, 25 parts modified water-based acrylic emulsion; Spraying solution: 15 parts of graphene zinc powder, 12 parts of modified epoxy resin, 8 parts of epoxy curing agent, 5 parts of polyether alcohol, 2 parts of silane coupling agent, 21 parts of aluminum powder, and 4 parts of hydroxyethyl cellulose.

[0034] The modified water-based acrylate emulsion is prepared by reacting menthol and acryloyl chloride to obtain menthol-structured acrylate, and then the menthol-structured acrylate and styrene monomer are polymerized and stirred under the emulsification action of sodium lauryl sulfate to obtain a polyacrylate nanoparticle modified emulsion. The mass ratio of sodium lauryl sulfate, menthol and acryloyl chloride is 1:1:2.

[0035] The particle size of the glass microbeads is 20 μm; the graphene zinc powder is prepared by mixing graphene oxide and zinc powder, and the mass ratio of graphene to zinc powder is 1:1.

[0036] The modified epoxy resin is prepared by mixing 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride with epoxy resin, wherein the mass ratio of the epoxy resin, 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride is 1:1:2.

[0037] The epoxy curing agent is an aliphatic diamine.

[0038] A production process for salt spray resistant aluminum coating fabric comprises the following steps: (1) Polyester fiber and nylon fiber are mixed to prepare a base fabric, and then glass microbeads are attached to the base fabric through a modified water-based acrylic emulsion to prepare a base fabric; (2) mixing graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder and hydroxyethyl cellulose to prepare a spray solution; (3) The spray solution is sprayed onto the base fabric by a special spraying method, and the spraying is uniform to obtain a salt spray resistant aluminum coating fabric. The spraying method is to use a fine needle spray, the nozzle diameter is 1.2mm, the spray gun pressure is 0.25MPA, and the drying conditions are to stand at 80℃ for 30min, then heat to 200℃ and stand for 40min, and naturally cure indoors for 20h.

[0039] Example 2, a salt spray resistant aluminum coating fabric, comprising the following raw materials in parts by weight: Base fabric: 28 parts polyester fiber, 20 parts nylon fiber, 16 parts glass microbeads, 48 ​​parts modified water-based acrylic emulsion; Spraying solution: 25 parts of graphene zinc powder, 18 parts of modified epoxy resin, 12 parts of epoxy curing agent, 8 parts of polyether alcohol, 3 parts of silane coupling agent, 22 parts of aluminum powder, and 9 parts of hydroxyethyl cellulose.

[0040] The modified water-based acrylate emulsion is prepared by reacting menthol and acryloyl chloride to obtain menthol-structured acrylate, and then the menthol-structured acrylate and styrene monomer are polymerized and stirred under the emulsification action of sodium lauryl sulfate to obtain a polyacrylate nanoparticle modified emulsion. The mass ratio of sodium lauryl sulfate, menthol and acryloyl chloride is 1:2:5.

[0041] The particle size of the glass microbeads is 35 μm; the graphene zinc powder is prepared by mixing graphene oxide and zinc powder, and the mass ratio of graphene to zinc powder is 2:1.

[0042] The modified epoxy resin is prepared by mixing 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride with epoxy resin, wherein the mass ratio of the epoxy resin, 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride is 3:1:2.

[0043] The epoxy curing agent is an aliphatic diamine.

[0044] A production process for salt spray resistant aluminum coating fabric comprises the following steps: (1) Polyester fiber and nylon fiber are mixed to prepare a base fabric, and then glass microbeads are attached to the base fabric through a modified water-based acrylic emulsion to prepare a base fabric; (2) mixing graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder and hydroxyethyl cellulose to prepare a spray solution; (3) The spray solution is sprayed onto the base fabric by a special spraying method, and the spraying is uniform to obtain a salt spray resistant aluminum coating fabric. The spraying method is to use a fine needle spray, the nozzle diameter is 1.5mm, the spray gun pressure is 0.5MPA, and the drying conditions are to stand at 90℃ for 50min, then heat to 220℃ and stand for 60min, and naturally cure indoors for 24h.

[0045] Example 3, a salt spray resistant aluminum coating fabric, comprising the following raw materials in parts by weight: Base fabric: 32 parts polyester fiber, 28 parts nylon fiber, 22 parts glass microbeads, 65 parts modified water-based acrylic emulsion; Spraying solution: 30 parts of graphene zinc powder, 23 parts of modified epoxy resin, 16 parts of epoxy curing agent, 12 parts of polyether alcohol, 4 parts of silane coupling agent, 36 parts of aluminum powder, and 16 parts of hydroxyethyl cellulose.

[0046] The modified water-based acrylate emulsion is prepared by reacting menthol and acryloyl chloride to obtain menthol-structured acrylate, and then the menthol-structured acrylate and styrene monomer are polymerized and stirred under the emulsification action of sodium lauryl sulfate to obtain a polyacrylate nanoparticle modified emulsion. The mass ratio of sodium lauryl sulfate, menthol and acryloyl chloride is 1:3:8.

[0047] The particle size of the glass microbeads is 45 μm; the graphene zinc powder is prepared by mixing graphene oxide and zinc powder, and the mass ratio of graphene to zinc powder is 5:2.

[0048] The modified epoxy resin is prepared by mixing 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride with epoxy resin, wherein the mass ratio of the epoxy resin, 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride is 5:1:2.

[0049] The epoxy curing agent is an aliphatic diamine.

[0050] A production process for salt spray resistant aluminum coating fabric comprises the following steps: (1) Polyester fiber and nylon fiber are mixed to prepare a base fabric, and then glass microbeads are attached to the base fabric through a modified water-based acrylic emulsion to prepare a base fabric; (2) mixing graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder and hydroxyethyl cellulose to prepare a spray solution; (3) The spray solution is sprayed onto the base fabric by a special spraying method, and the spraying is uniform to obtain a salt spray resistant aluminum coating fabric. The spraying method is to use a fine needle spray, the nozzle diameter is 1.8mm, the spray gun pressure is 0.8MPA, and the drying conditions are to stand at 100℃ for 50min, then heat to 240℃ and stand for 60min, and naturally cure indoors for 24h.

[0051] Comparative Example 1 is different from Example 1 in that the modified water-based acrylic emulsion is not added to the base fabric.

[0052] Comparative Example 2 is different from Example 1 in that no graphene zinc powder is added to the spraying solution.

[0053] Comparative Example 3 is different from Example 1 in that no modified epoxy resin is added to the spraying solution.

[0054] Spraying method such as Figure 4 As shown, the first spraying is at the overlapping part of the yarn, and the spraying amount is a1; the second spraying is at the yarn connection part, and the spraying amount is a2, a1>a2, the gas pressure is 2.0 MPa, the temperature is 28℃, the particle speed is 800m / s, helium drive, and the nozzle distance is 15mm. During the spraying process, the viscosity, spraying pressure, curing temperature and time parameters of the coating need to be controlled to ensure the adhesion and performance of the coating. Spraying distances that are too close or too far will affect the coating quality and efficiency. Reasonable spraying distances help ensure that the spraying particles obtain sufficient energy and temperature during flight, thereby forming a high-quality coating.

[0055] The preferred solution is: the first spraying is at the yarn connection part, and the spraying amount is a1; the second spraying is at the yarn overlapping part, and the spraying amount is a2, a1>a2, the gas pressure is 2.0 MPa, the temperature is 28°C, the particle speed is 800m / s, helium drive, and the nozzle distance is 15mm. During the spray drying process, the temperature in the tower is usually controlled at around 200°C to ensure uniform drying of the material and formation of powder. The spray flow rate has an important influence on the uniformity and density of the coating. Excessive flow rate may cause the coating to be loose, while too small flow rate may affect the coverage and quality of the coating.

[0056] Performance testing: The test method is as follows: (1) Salt spray resistance: Refer to the national standard "GB / T 10125-2021 Artificial atmosphere corrosion test salt spray test".

[0057] (2) Cyclic aging resistance: Refer to the international standard "ISO 12944 Paints and varnishes-Protective coating systems for corrosion protection of steel structures".

[0058] (3) The thermal insulation test is as follows: simulate a glass sunroom and conduct a thermal insulation performance test (same fully enclosed glass space, same brand and power heater, same thermometer, same glass). The ambient temperature is 20℃, the heater temperature rises to 40℃ and maintains irradiation for 30 minutes, and the ambient temperature in the glass box is monitored. The thermal insulation test result is the heater temperature minus the ambient temperature in the glass box. The larger the thermal insulation test result (temperature difference), the better the thermal insulation performance.

[0059] (4) Adhesion test: GB / T9286 is used to measure the adhesion level.

[0060] (5) Water resistance test: Use GB / T1733, soak it in water for 7 days and then take it out to observe whether the appearance of the coating has not changed.

[0061] Table 1 Performance test results

[0062] As shown in Table 1, the salt spray resistant aluminum coated fabric prepared in Example 1 has better salt spray resistance than that prepared in Comparative Example 1, with a cyclic aging resistance time of up to 3000h, good thermal insulation and water resistance, and strong adhesion. In Comparative Example 1, no modified water-based acrylic emulsion was added to the base fabric, which significantly reduced the adhesion of the spray solution to the base fabric, resulting in insufficient bonding between the base fabric and the spray solution. The modified water-based acrylic emulsion was added to the base fabric. Certain monomers in the modified water-based acrylic emulsion have a unique bridged ring structure that can form a stable connection with the substrate through hydrogen bonds, thereby significantly improving the adhesion of the coating film. The difference in data between the comparative example and the example illustrates that the salt spray resistant aluminum coated fabric prepared in the present invention has excellent high temperature oxidation resistance and anti-peeling ability, and performs well as a roller blind in harsh environments. The salt spray resistant aluminum coated fabric used in the roller blind has good transparency, strong adhesion, good reflective effect, and good corrosion resistance.

[0063] The foregoing description is merely an exemplary embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A salt spray resistant aluminum coated fabric, characterized in that: The invention comprises the following raw materials in parts by weight: Base fabric: 15-32 parts polyester fiber, 12-28 parts nylon fiber, 8-22 parts glass microbeads, 25-65 parts modified water-based acrylic emulsion; Spraying solution: 15-30 parts of graphene zinc powder, 12-23 parts of modified epoxy resin, 8-16 parts of epoxy curing agent, 5-12 parts of polyether alcohol, 2-4 parts of silane coupling agent, 21-36 parts of aluminum powder, 4-16 parts of hydroxyethyl cellulose.

2. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The modified water-based acrylic ester emulsion is prepared by reacting menthol and acryloyl chloride to obtain menthol-structured acrylic ester, and then the menthol-structured acrylic ester and styrene monomer are polymerized and stirred under the emulsification effect of sodium lauryl sulfate to obtain a polyacrylate nanoparticle modified emulsion. The mass ratio of menthol to acryloyl chloride is 1-3:1-8.

3. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The particle size of the glass microbeads is 20-45 μm.

4. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The graphene zinc powder is prepared by mixing graphene oxide with zinc powder, and the mass ratio of the graphene to the zinc powder is 1-5:1-2.

5. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The modified epoxy resin is prepared by mixing 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride with epoxy resin, wherein the mass ratio of the 1,4-p-dichlorobenzyl and 4-vinylbenzyl chloride is 1:1-2.

6. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The epoxy curing agent is one or more of aliphatic diamine, organic acid anhydride, diethylenetriamine, 2-ethyl-4-methylimidazole and hexahydrophthalic anhydride.

7. The salt spray resistant aluminum coated fabric according to claim 1, characterized in that: The aluminum powders are all in the form of flakes, with a particle size of 40-50 μm.

8. The production process of the salt spray resistant aluminum coated fabric according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Polyester fiber and nylon fiber are mixed to prepare a base fabric, and then glass microbeads are attached to the base fabric through a modified water-based acrylic emulsion to prepare a base fabric; (2) mixing graphene zinc powder, modified epoxy resin, epoxy curing agent, polyether alcohol, silane coupling agent, aluminum powder and hydroxyethyl cellulose to prepare a spray solution; (3) The spray solution is sprayed on the base fabric by a special spraying method, and the spraying is uniform to obtain a salt spray resistant aluminum coating fabric.

9. The production process of the salt spray resistant aluminum coated fabric according to claim 8, characterized in that: The spraying method is to use a fine needle spray, the nozzle diameter is 1-2mm, the spray gun pressure is 0.25-0.8MPA, the drying conditions are to stand at 80-100℃ for 30-50min, then heat to 200-240℃ and stand for 40-60min, and naturally cure indoors for 20-24h. The special spraying method is to spray in a dot-like layer.

10. Use of the salt spray resistant aluminum coating fabric according to any one of claims 1 to 9 in a high-reflective energy-saving roller blind.

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