Corrosion-resistant waterproof aluminum foil glass fabric and preparation method thereof
By forming a dense waterproof coating and a high-temperature resistant adhesive layer on aluminum foil fiberglass cloth, the corrosion and waterproofing problems of aluminum foil fiberglass cloth in high temperature and high humidity environments are solved, achieving excellent high temperature resistance, corrosion resistance and waterproof performance, which is suitable for heating network pipeline systems.
Patent Information
- Application Number
- CN202511698230.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-01-23
AI Technical Summary
Existing aluminum foil fiberglass cloth is prone to corrosion in high temperature and high humidity environments, resulting in decreased reflectivity, structural damage, and insufficient waterproof performance, making it difficult to meet the long-term durability and safety requirements of modern heating network systems.
Waterproof fiberglass cloth and high-temperature resistant adhesive layer are used to form a dense coating through silane coupling agent and polyimide adhesive prepolymer. Combined with Schiff base structure to enhance interfacial bonding force, a corrosion-resistant and waterproof aluminum foil fiberglass cloth is formed.
It significantly improves the high temperature resistance, corrosion resistance and waterproof performance of aluminum foil fiberglass cloth, meeting the long-term stable service requirements under harsh working conditions such as heating network pipelines.
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Figure SMS_1
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of aluminum foil composite glass fiber cloth, in particular to a corrosion-resistant and waterproof aluminum foil glass fiber cloth and a preparation method thereof. BACKGROUND
[0002] In the central heating system, the heat network pipeline widely uses aluminum foil glass fiber cloth as the reflective layer material covered by the thermal insulation layer to achieve heat radiation reflection, energy saving and insulation, and certain moisture and water resistance. The aluminum foil glass fiber cloth is usually composed of aluminum foil and glass fiber cloth, wherein the glass fiber cloth is mainly composed of glass fiber and short-line needle-punched non-woven fabric, and is an inorganic non-metallic material with excellent performance. According to the different contents of alkali metal oxides (such as Na2O), the glass fiber cloth can be divided into three types: high-alkali cloth, medium-alkali cloth and non-alkali cloth. At present, the aluminum foil glass fiber cloth suitable for the heat network pipeline system mostly uses medium-alkali cloth, because it has moderate cost and certain mechanical strength and heat resistance.
[0003] However, in the actual operation process, the environment of the heat network pipeline often has conditions of high temperature, high humidity, and even contains corrosive media (such as chloride ions and sulfides). Under this environment, the aluminum foil layer in the aluminum foil glass fiber cloth is prone to electrochemical corrosion or chemical corrosion, which leads to a decrease in reflective performance and structural damage, thereby affecting the long-term stability and service life of the entire thermal insulation system. It is particularly worth noting that the alkali metal oxides (such as Na2O) contained in the medium-alkali glass fiber cloth may be precipitated and form an alkaline environment in a humid environment, further accelerating the corrosion process of the aluminum foil. The mechanism of action is similar to the corrosion behavior of alkaline glass wool on metal materials, that is, the alkaline components promote the oxidation and dissolution of aluminum in the presence of moisture, causing spots, perforations, and even peeling on the surface of the aluminum foil.
[0004] In addition, the traditional aluminum foil glass fiber cloth also has problems of insufficient water resistance, poor thermal stability, and the like under alternating high temperature and high humidity or extreme temperature changes, and it is difficult to meet the higher requirements of modern heat network systems on material long-term durability, safety, and energy saving. Therefore, it is urgent to develop an aluminum foil glass fiber cloth with excellent high-temperature resistance, corrosion resistance, and water resistance. SUMMARY
[0005] The purpose of the present application is to provide a corrosion-resistant and waterproof aluminum foil glass fiber cloth and a preparation method thereof to solve the technical problems mentioned in the background.
[0006] The technical solution to achieve the purpose of the present application is: In a first aspect, the present application provides a corrosion-resistant and waterproof aluminum foil glass fiber cloth, which comprises, from top to bottom, a waterproof glass fiber cloth, a high-temperature-resistant adhesive layer, and an aluminum foil. The waterproof glass fiber cloth is obtained by dip padding with a waterproof finishing agent. The high-temperature-resistant adhesive layer is obtained by curing a polyimide-based adhesive prepolymer.
[0007] Further, the waterproof finishing agent mainly comprises, in terms of mass fraction, 0.7-2.1 mass fraction of a silane coupling agent, 2.12-2.15 mass fraction of a perfluoropolyether diol, 29.1 mass fraction of isophorone diisocyanate, and 41.66-42.57 mass fraction of polycaprolactone.
[0008] Further, the silane coupling agent comprises N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane.
[0009] Further, the polyimide-based adhesive prepolymer raw material component mainly comprises 4,4'-oxybisphthalic anhydride, 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine.
[0010] In a second aspect, the present application provides a preparation method of the corrosion-resistant waterproof aluminum foil glass fiber cloth as described in the first aspect, and the preparation steps comprise: (1) polishing and acid treating one side of the aluminum foil to obtain a pretreated aluminum foil; (2) coating a polyimide-based adhesive on the polished and acid-treated side of the pretreated aluminum foil to form a high-temperature-resistant adhesive layer, then laying waterproof glass fiber cloth on the high-temperature-resistant adhesive layer, and finally heating and curing to obtain the corrosion-resistant waterproof aluminum foil glass fiber cloth.
[0011] Further, the preparation steps of the polyimide-based adhesive prepolymer are as follows: A1. dissolving o-phenylenediamine in methanol, then adding a methanol solution of 4-amino-2-hydroxybenzaldehyde dropwise, stirring at 75-85°C for 11-13h, filtering, washing, and drying after cooling to room temperature to obtain a diamino-containing intermediate; A2. dissolving 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, the diamino-containing intermediate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane in N-methyl pyrrolidone, then adding 4,4'-oxybisphthalic anhydride, and reacting at room temperature for 5-7h to obtain the polyimide-based adhesive prepolymer.
[0012] Further, the molar ratio of 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, 4,4'-oxybisphthalic anhydride, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine is (9-11):(9-11):(6-10):(29-33):(4.5-6.5):(2-3).
[0013] Further, the preparation steps of the waterproof glass fiber cloth are as follows: after two-dip-two-nip in the waterproof finishing agent, the waterproof glass fiber cloth is first baked at 75~85℃ for 170~190s, and then baked at 135℃ for 80~100s to obtain the waterproof glass fiber cloth; wherein, the finishing concentration is 2~4%owf, and the pick-up rate is 25~35%.
[0014] Further, the preparation steps of the waterproof finishing agent are as follows: B1. The raw material components are weighed and prepared; B2. Under nitrogen protection, isophorone diisocyanate, polycaprolactone, perfluoropolyether diol, silane coupling agent are stirred and mixed, then the catalyst dibutyltin dilaurate is added while stirring, then N,N-dimethylacetamide is added, after stirring at 78~82℃ for 2~4h, the crosslinking agent trimethylolpropane is added and stirred for 1~2h, then the temperature is lowered to 40℃, and the viscosity is adjusted to 2000~3000mPa·s by adding acetone, then triethylamine is added at a neutralization degree of 100% and stirred for 14~16min, finally deionized water is added and high-speed stirred to disperse and emulsify, and acetone is removed by reduced pressure distillation to obtain the waterproof finishing agent.
[0015] Further, the mass ratio of the perfluoropolyether diol, dibutyltin dilaurate, N,N-dimethylacetamide, and trimethylolpropane is (2.12~2.15):(0.03~0.05):(23~25):(1.6~1.7); and the solid content of the waterproof finishing agent is 30~40%.
[0016] By adopting the above technical scheme, the present application has the following beneficial effects: (1) The corrosion-resistant waterproof aluminum foil glass fiber cloth comprises, from top to bottom, a waterproof glass fiber cloth, a high-temperature-resistant adhesive layer, and an aluminum foil; wherein the waterproof glass fiber cloth is obtained by impregnation with a waterproof finishing agent; the high-temperature-resistant adhesive layer is obtained by curing a polyimide-based adhesive prepolymer; and the prepared corrosion-resistant waterproof aluminum foil glass fiber cloth exhibits excellent performance in terms of high-temperature resistance, corrosion resistance, and waterproofness.
[0017] (2) The raw material components of the waterproof finishing agent mainly include a silane coupling agent, a perfluoropolyether diol, isophorone diisocyanate, and polycaprolactone; the perfluoropolyether diol has a strong electronegative fluorine atom in its molecular structure, extremely low surface energy, and excellent hydrophobic and oleophobic properties, can form a dense and stable low-surface-energy coating on the surface of the glass fiber cloth, and significantly improves the waterproofness of the material; meanwhile, the C-F bond has high bond energy and good thermal stability, which effectively enhances the high-temperature resistance of the waterproof glass fiber cloth; the silane coupling agent forms a firm Si-O-Si chemical bond through the condensation reaction between the silicon hydroxyl group generated after hydrolysis and the hydroxyl group on the surface of the glass fiber cloth, not only improves the interfacial bonding force between the waterproof coating and the glass fiber substrate, but also further enhances the high-temperature resistance of the waterproof glass fiber cloth.
[0018] (3) The polyimide adhesive prepolymer raw material components of the application mainly include 4,4'-oxybisphthalic anhydride, 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diaminodiphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine. In the preparation process, first, the 4-amino-2-hydroxybenzaldehyde and the o-phenylenediamine are pre-reacted, the aldehyde group on the 4-amino-2-hydroxybenzaldehyde and the amino group of the o-phenylenediamine undergo condensation reaction, and a Schiff base unit with rigidity and thermal stability is generated in situ. This structure not only improves the conjugation degree and rigidity of the prepolymer main chain, but also helps to enhance the heat resistance of the final high-temperature-resistant adhesive layer. Then, the above pre-reaction product and other aromatic dianhydride and multifunctional diamine monomers are added into the system to form a fluorine-containing, silicon-containing and Schiff base structure-containing polyimide precursor through step-by-step polymerization, and a high-temperature-resistant adhesive layer is obtained after high-temperature curing. The hexafluoroisopropyl structure endows the material with excellent thermal stability and low dielectric properties, the siloxane segment improves the flexibility and interfacial compatibility of the adhesive layer, and the Schiff base structure further strengthens the thermal decomposition temperature of the molecular chain.
[0019] (4) In the preparation of the corrosion-resistant and waterproof aluminum foil glass fiber cloth, one side of the aluminum foil is first polished and acid-treated to remove the surface oxide film and impurities, and to form a micro-nano rough structure and rich active hydroxyl groups and exposed metal aluminum active sites on the surface of the aluminum foil. Then, a polyimide adhesive is coated on the pretreated surface to form a high-temperature-resistant adhesive layer. The adhesive contains a Schiff base structure generated in situ from 4-amino-2-hydroxybenzaldehyde and o-phenylenediamine. The nitrogen atom in the molecule has a lone pair of electrons, which can coordinate with the exposed metal aluminum active sites on the surface of the aluminum foil after acid treatment, and form a stable Schiff base-aluminum complex interface layer in situ. This not only significantly enhances the chemical bonding strength between the adhesive layer and the aluminum foil, but also effectively passivates the aluminum surface, inhibits its electrochemical corrosion in a humid or corrosive environment, thereby improving the corrosion resistance of the overall structure. Then, a waterproof glass fiber cloth is laid on the high-temperature-resistant adhesive layer, and finally heated and cured. The polyimide precursor is cyclized and crosslinked to form a three-dimensional network with high aromaticity, fluorine content, silicon content and Schiff base structure. This network has excellent thermal stability, low surface energy and strong interfacial bonding force. The finally obtained corrosion-resistant and waterproof aluminum foil glass fiber cloth has significantly improved performance in high-temperature resistance, corrosion resistance, waterproofness and interlayer interfacial bonding force, etc. due to the synergistic effect of the Schiff base-aluminum complex layer formed on the surface of the aluminum foil, the high thermal stability of the high-temperature-resistant adhesive layer and the low surface energy and hydrophobic properties of the waterproof glass fiber cloth. It can meet the long-term stable service requirements under harsh working conditions such as hot water pipelines. DETAILED DESCRIPTION
[0020] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with specific embodiments.
[0021] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0022] The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.
[0023] The aluminum foil adopts 1235-O type rolled aluminum, adopts double-rolling process, one side is bright, one side is dark (hereinafter referred to as dark side), and the thickness is 6.5 μm.
[0024] The glass fiber cloth is 170 g / m 2 Slightly alkaline glass fiber cloth.
[0025] The silane coupling agent adopts N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane. Example 1
[0026] A preparation method of a corrosion-resistant waterproof aluminum foil glass fiber cloth, the preparation steps comprising: (1) polishing the dark side of the aluminum foil with 80 mesh sandpaper, then spraying 100 mL / m 2 of 10% hydrochloric acid on the polished dark side for acid treatment for 5 min and drying to obtain a pretreated aluminum foil; (2) coating a layer of polyimide adhesive with a grammage of 50 g / m 2 on the polished and acid-treated side of the pretreated aluminum foil, then laying a layer of waterproof glass fiber cloth, and finally heating to 180°C for constant temperature curing for 30 min, then heating to 280°C for curing for 10 min to obtain a corrosion-resistant waterproof aluminum foil glass fiber cloth.
[0027] The preparation steps of the polyimide adhesive prepolymer are as follows: A1. Dissolve o-phenylenediamine in methanol with a mass of 200 times that of o-phenylenediamine, then add dropwise a solution of 4-amino-2-hydroxybenzaldehyde in methanol with a mass of 200 times that of o-phenylenediamine, stir at 75°C for 11 h, cool to room temperature, filter, wash with cold methanol solution at 0°C, and dry at 50°C for 24 h to obtain a diamino-containing intermediate; A2. 4,4-(hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, diamin-containing intermediate, 1,3-bis (3-aminopropyl) -1,1,3,3-tetramethyl disiloxane are dissolved in N-methyl pyrrolidone, then 4,4'-oxybisphthalic anhydride is added, and the reaction is carried out at room temperature for 6h to obtain a polyimide-based adhesive prepolymer with a solid content of 30%; wherein the molar ratio of 4,4-(hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis (3-aminopropyl) -1,1,3,3-tetramethyl disiloxane, 4,4'-oxybisphthalic anhydride, 4-amino-2-hydroxybenzaldehyde, o-phenylenediamine is 9:11:6:29:4.5:2.
[0028] The preparation steps of the waterproof glass fiber cloth are as follows: after two-dip-two-rolling of the waterproof glass fiber cloth in the waterproof finishing agent, first baking at 75℃ for 170s, and then baking at 135℃ for 80s to obtain; wherein the finishing concentration is 2%owf, and the pick-up rate is 25%.
[0029] The preparation steps of the waterproof finishing agent are as follows: Under the protection of nitrogen, 29.1 parts by mass of isophorone diisocyanate, 41.66 parts by mass of polycaprolactone, 2.12 parts by mass of perfluoropolyether diol, 0.7 parts by mass of silane coupling agent are stirred and mixed, then 0.03 parts by mass of catalyst dibutyltin dilaurate is added dropwise while stirring, then 23 parts by mass of N,N-dimethylacetamide is added, after stirring at 78℃ for 2h, 1.6 parts by mass of crosslinking agent trimethylolpropane is added and continues to stir for 1h, then the temperature is lowered to 40℃, and the viscosity is adjusted to 2000mPa·s by adding acetone, then triethylamine is added with a neutralization degree of 100% and stirred for 14min, finally deionized water is added and stirred and dispersed at 3000rpm to emulsify, and acetone is removed by reduced pressure distillation to obtain a waterproof finishing agent with a solid content of 30%. Example 2
[0030] A preparation method of a corrosion-resistant waterproof aluminum foil glass fiber cloth, the preparation steps include: (1) The black surface of the aluminum foil is polished with 80 mesh sandpaper, then 100mL / m 2 After acid treatment for 5min, the pre-treated aluminum foil is dried; (2) A layer of polyimide-based adhesive with a grammage of 50g / m 2 is coated on the polished and acid-treated side of the pre-treated aluminum foil, then a layer of waterproof glass fiber cloth is laid, and finally the temperature is raised to 180℃ for constant temperature curing for 30min, and then the temperature is raised to 280℃ for heating and curing for 10min to obtain the corrosion-resistant waterproof aluminum foil glass fiber cloth.
[0031] The preparation steps of the polyimide-based adhesive prepolymer are as follows: A1. Dissolve o-phenylenediamine in 200 times the mass of methanol, then add a solution of 4-amino-2-hydroxybenzaldehyde dissolved in 200 times the mass of methanol, stir at 80℃ for 12h, cool to room temperature, then filter, wash with cold methanol solution at 0℃, and dry at 50℃ for 24h to obtain a diamino-containing intermediate; A2. Dissolve 4,4-(hexafluoroisopropyl)bis(p-phenyloxy)diphenylamine, 3,3'-diaminodiphenyl sulfone, the diamino-containing intermediate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane in N-methylpyrrolidone, then add 4,4'-oxybisphthalic anhydride, and react at room temperature for 6h to obtain a polyimide-based adhesive prepolymer with a solid content of 30%; wherein the molar ratio of 4,4-(hexafluoroisopropyl)bis(p-phenyloxy)diphenylamine, 3,3'-diaminodiphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, 4,4'-oxybisphthalic anhydride, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine is 10:10:8:11:5.5:2.5.
[0032] The preparation steps of the waterproof glass fiber cloth are as follows: after two-dip-two-rolling in the waterproof finishing agent, first dry at 80℃ for 180s, and then bake at 135℃ for 90s to obtain the waterproof glass fiber cloth; wherein the finishing concentration is 3%owf, and the pick-up rate is 30%.
[0033] The preparation steps of the waterproof finishing agent are as follows: Under nitrogen protection, 29.1 parts by mass of isophorone diisocyanate, 42.1 parts by mass of polycaprolactone, 2.13 parts by mass of perfluoropolyether diol, and 1.4 parts by mass of silane coupling agent are stirred and mixed, then 0.04 parts by mass of catalyst dibutyltin dilaurate is added dropwise while stirring, followed by the addition of 24 parts by mass of N,N-dimethylacetamide, and the mixture is stirred at 80℃ for 3h, then 1.65 parts by mass of crosslinking agent trimethylolpropane is added and stirring is continued for 1.5h, then the temperature is lowered to 40℃, and the viscosity is adjusted to 3000mPa·s by adding acetone, then triethylamine is added at a neutralization degree of 100% and stirred for 15min, finally deionized water is added and stirred at 3000rpm for dispersion and emulsification, and acetone is removed by distillation under reduced pressure to obtain a waterproof finishing agent with a solid content of 35%. Example 3
[0034] A preparation method of a corrosion-resistant waterproof aluminum foil glass fiber cloth, the preparation steps comprising: (1) The black surface of the aluminum foil is polished flat with 80 mesh sandpaper, then 100mL / m 2 After acid treatment for 5min, the polished black surface is dried to obtain a pretreated aluminum foil. (2) coating a layer of 50 g / m 2 polyimide adhesive, then laying a waterproof glass fiber cloth, and finally heating to 180℃ for constant temperature curing for 30 min, and then heating to 280℃ for curing for 10 min to obtain the corrosion-resistant waterproof aluminum foil glass fiber cloth.
[0035] The preparation steps of the polyimide adhesive prepolymer are as follows: A1. Dissolve o-phenylenediamine in 200 times the mass of methanol, then add a solution of 4-amino-2-hydroxybenzaldehyde in 200 times the mass of methanol in o-phenylenediamine, stir at 85℃ for 13h, cool to room temperature, then filter, wash with cold methanol solution at 0℃, and dry at 50℃ for 24h to obtain a diamino-containing intermediate; A2. Dissolve 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, the diamino-containing intermediate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane in N-methyl pyrrolidone, then add 4,4'-oxybisphthalic anhydride, and react at room temperature for 7h to obtain a polyimide adhesive prepolymer with a solid content of 30%; wherein the molar ratio of 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, 4,4'-oxybisphthalic anhydride, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine is 11:9:10:33:6.5:3.
[0036] The preparation steps of the waterproof glass fiber cloth are as follows: after two dips and two rolls in the waterproof finishing agent, first dry at 85℃ for 190s, and then bake at 135℃ for 100s to obtain the waterproof glass fiber cloth; wherein the finishing concentration is 4% owf and the roll liquid rate is 35%.
[0037] The preparation steps of the waterproof finishing agent are as follows: Under nitrogen protection, stir and mix 29.1 parts by mass of isophorone diisocyanate, 42.57 parts by mass of polycaprolactone, 2.15 parts by mass of perfluoropolyether diol, and 2.1 parts by mass of silane coupling agent, then add 0.05 parts by mass of catalyst dibutyltin dilaurate dropwise while stirring, then add 25 parts by mass of N,N-dimethylacetamide, stir and react at 82℃ for 4h, then add 1.7 parts by mass of crosslinking agent trimethylolpropane and continue stirring for 2h, then cool to 40℃, add acetone to adjust the viscosity to 3000 mPa·s, then add triethylamine with a neutralization degree of 100% and stir for 16 min, finally add deionized water to stir and disperse emulsify at 3000 rpm, remove the acetone by reduced pressure distillation, and obtain a waterproof finishing agent with a solid content of 40%. Comparative Example 1
[0038] Comparative Example 1 and Example 2 differ in that the corrosion-resistant waterproof aluminum foil glass cloth uses glass cloth instead of waterproof glass cloth, and the remaining steps are the same as Example 2. Comparative Example 2
[0039] Comparative Example 2 and Example 2 differ in that the main components of the polyimide adhesive prepolymer raw materials include 4,4'-oxydiphthalic anhydride, 4,4- (hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3- bis (3-aminopropyl) -1,1,3,3-tetramethyl disiloxane, o-phenylenediamine; the remaining steps are the same as Example 2. Comparative Example 3
[0040] Comparative Example 3 and Example 2 differ in that the main components of the polyimide adhesive prepolymer raw materials include 4,4'-oxydiphthalic anhydride, 4,4- (hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3- bis (3-aminopropyl) -1,1,3,3-tetramethyl disiloxane, and the remaining steps are the same as Example 2. Comparative Example 4
[0041] Comparative Example 4 and Example 2 differ in that the polyimide adhesive prepolymer preparation step is as follows: 4,4- (hexafluoroisopropyl) bis (p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 4-amino-2-hydroxybenzaldehyde, o-phenylenediamine, 1,3- bis (3-aminopropyl) -1,1,3,3-tetramethyl disiloxane are dissolved in N-methyl pyrrolidone, then 4,4'-oxydiphthalic anhydride is added, and the reaction is carried out at room temperature for 6h to obtain a polyimide adhesive prepolymer with a solid content of 30%; the remaining steps are the same as Example 2. Comparative Example 5
[0042] Comparative Example 5 and Example 2 differ in step (1), which is as follows: (1) the black surface of the aluminum foil is ground flat with 80-mesh sandpaper to obtain a pretreated aluminum foil; the remaining steps are the same as Example 2. Effect Example
[0043] Waterproofness: The hydrophobic properties of the corrosion-resistant waterproof aluminum foil glass cloth prepared in Examples 1-3 and Comparative Examples 1-5 were tested using a dynamic contact angle measuring instrument with model number DSA30; the water contact angle on the surface of the corrosion-resistant waterproof aluminum foil glass cloth was characterized by the fixed titration method, and each sample was measured 5 times, and the group closest to the average value was selected.
[0044] High temperature resistance: The corrosion-resistant waterproof aluminum foil glass fiber cloth prepared from Examples 1-3 and Comparative Examples 1-5 was cut into a size of 2 cm x 2 cm, and was kept at 370°C, 375°C, 380°C, and 390°C for 4 h, respectively, and then was powered off. After the sample was naturally cooled to room temperature, it was taken out and observed to determine whether the aluminum foil and the glass fiber cloth were bonded after heating.
[0045] Corrosion resistance: The corrosion-resistant waterproof aluminum foil glass fiber cloth prepared from Examples 1-3 and Comparative Examples 1-5 was placed at 60°C, and the relative humidity was controlled at 96% for 90 min. The corrosion of the aluminum foil was observed, and the waterproof glass fiber cloth layer was in contact with the environment.
[0046] Table 1 below shows the performance test results of the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared from Examples 1-3 and Comparative Examples 1-5: Table 1
[0047] As shown in Table 1, the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared from Examples 1-3 has good waterproofness, high temperature resistance, and corrosion resistance.
[0048] Comparative Example 1 and Example 2 differ in that the corrosion-resistant waterproof aluminum foil glass fiber cloth uses a glass fiber cloth instead of a waterproof glass fiber cloth, and the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared has weak waterproofness and high temperature resistance.
[0049] Comparative Example 2 and Example 2 differ in that the polyimide adhesive prepolymer raw material component does not contain 4-amino-2-hydroxybenzaldehyde, and the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared has weak high temperature resistance and corrosion resistance.
[0050] Comparative Example 3 and Example 2 differ in that the polyimide adhesive prepolymer raw material component does not contain 4-amino-2-hydroxybenzaldehyde and o-phenylenediamine, and the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared has weak high temperature resistance and corrosion resistance.
[0051] Comparative Example 4 and Example 2 differ in that the polyimide adhesive prepolymer is prepared by directly mixing and reacting the raw material components without pre-reaction, and the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared has weak high temperature resistance and corrosion resistance.
[0052] Comparative Example 5 and Example 2 differ in that the aluminum foil is not acid treated after polishing, and the corrosion-resistant waterproof aluminum foil glass fiber cloth prepared has weak high temperature resistance and corrosion resistance.
[0053] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A corrosion-resistant, waterproof aluminum foil glass cloth, characterized by, From top to bottom, it comprises waterproof glass fiber cloth, high-temperature resistant adhesive layer, aluminum foil; the waterproof glass fiber cloth is obtained by dip padding with waterproof finishing agent; the high-temperature resistant adhesive layer is obtained by curing polyimide adhesive prepolymer.
2. The corrosion-resistant, waterproof, aluminum foil fiberglass cloth according to claim 1, wherein, The waterproof finishing agent mainly comprises 0.7-2.1 parts by mass of silane coupling agent, 2.12-2.15 parts by mass of perfluoropolyether diol, 29.1 parts by mass of isophorone diisocyanate, and 41.66-42.57 parts by mass of polycaprolactone.
3. The corrosion-resistant, waterproof, aluminum foil fiberglass cloth of claim 2, wherein, The silane coupling agent comprises N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane.
4. The corrosion-resistant, waterproof, aluminum foil fiberglass cloth of claim 1, wherein, The polyimide adhesive prepolymer mainly comprises 4,4'-oxybisphthalic anhydride, 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine.
5. A method of producing the corrosion-resistant waterproof aluminum foil glass cloth according to any one of claims 1 to 4, characterized by, The preparation steps include: (1) polishing and acid treating one side of the aluminum foil to obtain pretreated aluminum foil; (2) coating polyimide adhesive on the polished and acid treated side of the pretreated aluminum foil to form a high-temperature resistant adhesive layer, then laying waterproof glass fiber cloth on the high-temperature resistant adhesive layer, and finally heating and curing to obtain the corrosion-resistant waterproof aluminum foil glass fiber cloth.
6. The method of claim 5, wherein the corrosion-resistant waterproof aluminum foil glass fabric is prepared by the steps of: (a) preparing a glass fabric; (b) coating the glass fabric with an aluminum foil; (c) coating the aluminum foil with a primer; (d) coating the primer with a top coat; and (e) curing the top coat. The preparation steps of the polyimide adhesive prepolymer are as follows: A1. dissolving o-phenylenediamine in methanol, then adding dropwise a methanol solution of 4-amino-2-hydroxybenzaldehyde, stirring at 75-85°C for 11-13h, cooling to room temperature, and then filtering, washing, and drying to obtain a diamino-containing intermediate; A2. dissolving 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, the diamino-containing intermediate, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane in N-methyl pyrrolidone, then adding 4,4'-oxybisphthalic anhydride, and reacting at room temperature for 5-7h to obtain the polyimide adhesive prepolymer.
7. The method for preparing corrosion-resistant and waterproof aluminum foil fiberglass cloth according to claim 6, characterized in that, The molar ratio of 4,4-(hexafluoroisopropyl) bis(p-phenoxy) diphenylamine, 3,3'-diamino diphenyl sulfone, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyl disiloxane, 4,4'-oxybisphthalic anhydride, 4-amino-2-hydroxybenzaldehyde, and o-phenylenediamine is (9-11):(9-11):(6-10):(29-33):(4.5-6.5):(2-3).
8. The method of claim 5, wherein the corrosion-resistant waterproof aluminum foil glass fabric is prepared by the steps of: (a) preparing a glass fabric; (b) coating the glass fabric with an aluminum foil; (c) coating the aluminum foil with a primer; (d) coating the primer with a top coat; and (e) curing the top coat. The preparation steps of the waterproof glass fiber cloth are as follows: after dip-padding and dip-padding again in the waterproof finishing agent, first baking at 75-85°C for 170-190s, and then baking at 135°C for 80-100s to obtain the waterproof glass fiber cloth; wherein the finishing concentration is 2-4% owf, and the pick-up rate is 25-35%.
9. The method of claim 8, wherein the corrosion-resistant, waterproof aluminum foil glass cloth is prepared by the steps of: (a) preparing a glass cloth; (b) coating the glass cloth with an aluminum foil; (c) coating the aluminum foil with a primer; (d) coating the primer with a top coat; and (e) curing the top coat. The preparation steps of the waterproof finishing agent are as follows: B1. weighing each raw material component for preparation; B2. Under nitrogen protection, isophorone diisocyanate, polycaprolactone, perfluoropolyether diol, silane coupling agent are stirred and mixed, then a catalyst dibutyltin dilaurate is added dropwise while stirring, followed by adding N,N-dimethylacetamide, stirring and reacting at 78-82 DEG C for 2-4 h, then a crosslinking agent trimethylolpropane is added and stirred for 1-2 h, then cooled to 40 DEG C, adding acetone to adjust the viscosity to 2000-3000 mPa·s, then adding triethylamine at a neutralization degree of 100% and stirring for 14-16 min, finally adding deionized water and high-speed stirring to disperse and emulsify, removing acetone by distillation under reduced pressure to obtain a waterproof finishing agent.
10. The method of claim 9, wherein the corrosion-resistant waterproof aluminum foil glass fabric is prepared by the steps of: (a) preparing a glass fabric; (b) coating the glass fabric with an aluminum foil; (c) coating the aluminum foil with a primer; (d) coating the primer with a top coat; and (e) curing the top coat. The mass ratio of the perfluoropolyether diol, dibutyltin dilaurate, N,N-dimethylacetamide, trimethylolpropane is (2.12-2.15):(0.03-0.05):(23-25):(1.6-1.7); the solid content of the waterproof finishing agent is 30-40%.