A method for manufacturing a coated keel

Abstract

The present invention relates to the technical field of coated keels, and in particular to a method for manufacturing a coated keel. The technical solution includes the following steps: configuring an adhesive, including the following steps: adding 8-12 parts of polyvinyl alcohol and 85-95 parts of water to a reactor according to weight parts, heating to 92-98°C while stirring until the polyvinyl alcohol is completely dissolved to form a polyvinyl alcohol aqueous solution; after the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 45-55°C. The keel surface manufactured by the present invention not only has a colorful pattern, but the color and pattern are not easy to fade, and the protective film formed on the surface can greatly improve the corrosion resistance, oxidation resistance, and high temperature resistance of the keel, extend the service life of the keel, enhance the barrier performance and mechanical strength of the coating, so that the coated keel can maintain good performance in a variety of environments.

Description

Technical Field

[0001] The invention relates to the technical field of coated keels, and in particular to a method for manufacturing a coated keel. Background Art

[0002] The preparation process of light steel keels in the prior art is: the raw steel strip is cut vertically according to the size, and the cut steel strip is processed into keels after bending and other treatments. Since keels are divided into different types, some types need to punch out various holes before bending. After that, some manufacturers will spray paint or dip paint the formed keels to color the keels. At the same time, the color and the performance of the paint, such as corrosion resistance and oxidation resistance, can be adjusted by adjusting the paint formula for spraying or dipping. So as to achieve that the manufactured keel is different from other products in color and performance.

[0003] The keel manufactured by the above manufacturing method has the following defects:

[0004] 1. The protective layer formed by paint spraying or dipping on the keel is easily scratched, and it is very easy to be scratched during transportation or loading and unloading, affecting the integrity of the overall color of the keel and the characteristics of the protective layer;

[0005] 2. Currently, only a single color of keel can be obtained by dipping or spraying, and the display of patterns cannot be achieved.

[0006] Therefore, the present application proposes a method for manufacturing a coated keel. Summary of the invention

[0007] The purpose of the present invention is to provide a method for manufacturing a coated keel in view of the problem that the protective layer formed by the existing paint spraying or dipping is easily scratched in the background technology.

[0008] The technical solution of the present invention is a method for manufacturing a coated keel, comprising the following steps:

[0009] S1. Preparing the adhesive, including the following steps:

[0010] S101, adding 8-12 parts of polyvinyl alcohol and 85-95 parts of water into a reaction kettle according to parts by weight, and heating to 92-98° C. while stirring until the polyvinyl alcohol is completely dissolved to form a polyvinyl alcohol aqueous solution;

[0011] S102, after obtaining the polyvinyl alcohol aqueous solution, lowering the temperature to 45-55° C.;

[0012] S103, adding a curing agent, ethyl acetate, silicone resin, modified glass flakes and ceramic powder into a reaction kettle, and stirring until completely mixed to obtain an adhesive;

[0013] S2. After the transparent PE film is colored or printed with patterns as required, the treated PE film is pasted onto the strip steel using an adhesive;

[0014] S3. Air-dry and solidify, cut the strip steel vertically, and then process it into keels.

[0015] Optionally, in step S101, the speed of the reactor is 100-200 rad / min, and the stirring time is 1-2 h.

[0016] Optionally, the curing agent is isocyanate, and the silicone resin is an amino-functional silicone resin.

[0017] Optionally, the silicone resin is any one of 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane.

[0018] Optionally, the preparation of the modified glass flakes comprises the following steps:

[0019] a. Surface treatment: clean and dry the glass flakes;

[0020] b. Silane coupling agent treatment: dissolve the silane coupling agent in a solvent, and then immerse the glass flakes in the solution;

[0021] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0022] Optionally, the silane coupling agent is any one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0023] Optionally, the solvent is ethanol.

[0024] Optionally, in step b, the weight ratio of the glass flakes, silane coupling agent and solvent is glass flakes: silane coupling agent: solvent = 20:1:40.

[0025] Optional, air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use hot air at 65℃-70℃ blown by a burner to air dry and cure for 36-48 hours.

[0026] Optionally, in step S103, the weight proportions of the curing agent, ethyl acetate, silicone resin, modified glass flakes and ceramic powder are 5-15 parts of the curing agent, 10-20 parts of ethyl acetate, 20-30 parts of the silicone resin, 15-25 parts of the modified glass flakes and 10-20 parts of the ceramic powder.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] By using polyvinyl alcohol as the base material, it is ensured that the adhesive has good bonding and adhesion, and can fully combine with the PE film and the surface of the strip steel. Adding the curing agent isocyanate to the adhesive can significantly improve the curing speed and bonding strength of the adhesive, which helps to improve production efficiency and product quality. Using ethyl acetate as a solvent ensures that polyvinyl alcohol can be evenly dispersed in the solution. The prepared adhesive has good stability and can maintain its performance unchanged during storage and use.

[0029] Amino-functional silicone resins may have a synergistic effect with curing agent isocyanate to enhance the curing reaction and bonding strength of the adhesive.

[0030] The modified glass flakes have a synergistic effect with the amino-functionalized silicone resin, which can improve the flexibility and heat resistance of the adhesive.

[0031] The adhesive provided in this solution adheres the processed PE film to the strip steel, replacing the traditional process of spraying or dipping paint after the strip steel is processed into the keel. The keel surface obtained by this process not only has a colorful pattern, but the color and pattern are not easy to fade. The protective film formed on the surface can greatly improve the corrosion resistance, oxidation resistance, and high temperature resistance of the keel, thereby extending the service life of the keel. At the same time, even if the protective film is scratched during transportation and loading and unloading, it will not affect the overall appearance, making the keel more widely used.

[0032] The present invention improves the corrosion resistance and wear resistance of the coating by modifying the glass flakes, and uses an adhesive with a specific ratio to enhance the bonding strength between the PE film and the steel strip; the transparent PE film can be personalized with color or printed with patterns, which increases the aesthetics and diversity.

[0033] In the ingredients, silicone resin and modified glass flakes have a synergistic effect. Silicone resin can provide good weather resistance and water repellency, while modified glass flakes further enhance the barrier properties and mechanical strength of the coating. The two work together to enable the coated keel to maintain good performance in a variety of environments. At the same time, ceramic micropowder can also increase the hardness and wear resistance of the coating, and work together with other ingredients to improve the overall performance, solving the problems of insufficient corrosion resistance, poor aesthetics, and weak bonding that may exist in existing keels. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] Example 1

[0036] The manufacturing method of the coated keel comprises the following steps:

[0037] 1) Glass flake modification:

[0038] a. Surface treatment: clean and dry the glass flakes;

[0039] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltriethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0040] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0041] 2) Preparing the adhesive, including the following steps:

[0042] 8 parts of polyvinyl alcohol and 85 parts of water were added to a reactor according to weight parts, and the temperature was raised to 92° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 100-200 rad / min, and the stirring time was 1 hour to form a polyvinyl alcohol aqueous solution;

[0043] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 45° C.;

[0044] 4) Add 5 parts of isocyanate, 10 parts of ethyl acetate, 20 parts of silicone resin, 15 parts of modified glass flakes, and 10 parts of ceramic powder to the reactor according to weight parts, and stir until completely mixed to obtain an adhesive; the silicone resin is 3-aminopropyltriethoxysilane;

[0045] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0046] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 65°C blown out by a burner to air dry and cure it for 36 hours. Cut the strip steel vertically and then process it into keels.

[0047] Example 2

[0048] The manufacturing method of the coated keel comprises the following steps:

[0049] 1) Glass flake modification:

[0050] a. Surface treatment: clean and dry the glass flakes;

[0051] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltrimethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0052] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0053] 2) Preparing the adhesive, including the following steps:

[0054] 9 parts of polyvinyl alcohol and 88 parts of water were added to a reactor according to weight parts, and the temperature was raised to 94° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 130 rad / min, and the stirring time was 1.2 h to form a polyvinyl alcohol aqueous solution;

[0055] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 48° C.;

[0056] 4) adding 8 parts of isocyanate, 13 parts of ethyl acetate, 23 parts of silicone resin, 18 parts of modified glass flakes, and 13 parts of ceramic powder to a reaction kettle according to weight parts, and stirring until completely mixed to obtain an adhesive; the silicone resin is any one of 3-aminopropyltrimethoxysilane;

[0057] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0058] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 66°C blown by a burner to air dry and cure it for 39 hours. Cut the strip steel vertically and then process it into keels.

[0059] Example 3

[0060] The manufacturing method of the coated keel comprises the following steps:

[0061] 1) Glass flake modification:

[0062] a. Surface treatment: clean and dry the glass flakes;

[0063] b. Silane coupling agent treatment: The silane coupling agent is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0064] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0065] 2) Preparing the adhesive, including the following steps:

[0066] 10 parts of polyvinyl alcohol and 90 parts of water were added to a reactor according to weight parts, and the temperature was raised to 96° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 150 rad / min, and the stirring time was 1.5 h to form a polyvinyl alcohol aqueous solution;

[0067] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 50° C.;

[0068] 4) adding 10 parts of isocyanate, 15 parts of ethyl acetate, 25 parts of silicone resin, 20 parts of modified glass flakes, and 15 parts of ceramic powder into a reaction kettle according to weight parts, and stirring until completely mixed to obtain an adhesive; the silicone resin 3-aminopropyltrimethoxysilane;

[0069] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0070] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 68°C blown out by a burner to air dry and cure it for 42 hours. Cut the strip steel vertically and then process it into keels.

[0071] Example 4

[0072] The manufacturing method of the coated keel comprises the following steps:

[0073] 1) Glass flake modification:

[0074] a. Surface treatment: clean and dry the glass flakes;

[0075] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltriethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0076] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0077] 2) Preparing the adhesive, including the following steps:

[0078] 11 parts of polyvinyl alcohol and 94 parts of water were added to a reactor according to weight parts, and the temperature was raised to 97° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 180 rad / min, and the stirring time was 1.8 h to form a polyvinyl alcohol aqueous solution;

[0079] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 52° C.;

[0080] 4) adding 12 parts of isocyanate, 18 parts of ethyl acetate, 28 parts of silicone resin, 22 parts of modified glass flakes, and 18 parts of ceramic powder to a reaction kettle according to weight parts, and stirring until completely mixed to obtain an adhesive; the silicone resin is 3-aminopropyltriethoxysilane;

[0081] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0082] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 68°C blown out by a burner to air dry and cure it for 45 hours. Cut the strip steel vertically and then process it into keels.

[0083] Example 5

[0084] The manufacturing method of the coated keel comprises the following steps:

[0085] 1) Glass flake modification:

[0086] a. Surface treatment: clean and dry the glass flakes;

[0087] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltriethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0088] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0089] 2) Preparing the adhesive, including the following steps:

[0090] 12 parts of polyvinyl alcohol and 95 parts of water were added to a reactor according to weight parts, and the temperature was raised to 98° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 200 rad / min, and the stirring time was 2 h to form a polyvinyl alcohol aqueous solution;

[0091] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 55° C.;

[0092] 4) adding 15 parts of isocyanate, 20 parts of ethyl acetate, 30 parts of silicone resin, 25 parts of modified glass flakes, and 20 parts of ceramic powder into a reaction kettle according to weight parts, and stirring until completely mixed to obtain an adhesive; the silicone resin is 3-aminopropyltriethoxysilane;

[0093] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0094] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 70°C blown out by a burner to air dry and cure it for 48 hours. Cut the strip steel vertically and then process it into keels.

[0095] Comparative Example 1

[0096] 1) Preparing the adhesive, including the following steps:

[0097] 8 parts of polyvinyl alcohol and 85 parts of water were added to a reactor according to weight parts, and the temperature was raised to 92° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 100-200 rad / min, and the stirring time was 1 hour to form a polyvinyl alcohol aqueous solution;

[0098] 2) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 45° C.;

[0099] 3) Add 5 parts of isocyanate, 10 parts of ethyl acetate, 20 parts of silicone resin, 15 parts of modified glass flakes, and 10 parts of ceramic powder to the reaction kettle according to weight parts, and stir until completely mixed to obtain an adhesive; the silicone resin is 3-aminopropyltriethoxysilane;

[0100] 4) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0101] 5) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 65°C blown out by a burner to air dry and cure for 36 hours. Cut the strip steel vertically and then process it into keels.

[0102] Comparative Example 2

[0103] The manufacturing method of the coated keel comprises the following steps:

[0104] 1) Glass flake modification:

[0105] a. Surface treatment: clean and dry the glass flakes;

[0106] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltriethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0107] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0108] 2) Preparing the adhesive, including the following steps:

[0109] 8 parts of polyvinyl alcohol and 85 parts of water were added to a reactor according to weight parts, and the temperature was raised to 92° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 100-200 rad / min, and the stirring time was 1 hour to form a polyvinyl alcohol aqueous solution;

[0110] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 45° C.;

[0111] 4) Add 5 parts of isocyanate, 10 parts of ethyl acetate, 15 parts of modified glass flakes, and 10 parts of ceramic powder into the reactor according to weight parts, and stir until completely mixed to obtain an adhesive;

[0112] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0113] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 65°C blown out by a burner to air dry and cure it for 36 hours. Cut the strip steel vertically and then process it into keels.

[0114] Comparative Example 3

[0115] The manufacturing method of the coated keel comprises the following steps:

[0116] 1) Glass flake modification:

[0117] a. Surface treatment: clean and dry the glass flakes;

[0118] b. Silane coupling agent treatment: The silane coupling agent is γ-aminopropyltriethoxysilane, which is dissolved in ethanol, and then the glass flakes are immersed in the solution. The weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:40;

[0119] c. Drying and curing: Dry the glass flakes treated with the silane coupling agent to remove the solvent and cure them to obtain modified glass flakes.

[0120] 2) Preparing the adhesive, including the following steps:

[0121] 8 parts of polyvinyl alcohol and 85 parts of water were added to a reactor according to weight parts, and the temperature was raised to 92° C. while stirring until the polyvinyl alcohol was completely dissolved. The speed of the reactor was 100-200 rad / min, and the stirring time was 1 hour to form a polyvinyl alcohol aqueous solution;

[0122] 3) After the polyvinyl alcohol aqueous solution is obtained, the temperature is lowered to 45° C.;

[0123] 4) Add 5 parts of isocyanate, 10 parts of ethyl acetate, 20 parts of silicone resin, and 15 parts of modified glass flakes to the reaction kettle according to weight parts, and stir until completely mixed to obtain an adhesive; the silicone resin is 3-aminopropyltriethoxysilane;

[0124] 5) After the transparent PE film is painted or printed with patterns as required, the treated PE film is pasted to the strip steel with adhesive;

[0125] 6) Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 65°C blown out by a burner to air dry and cure it for 36 hours. Cut the strip steel vertically and then process it into keels.

[0126] In order to verify the performance of the keel prepared by the present invention, the keels prepared in Examples 1-5 and Comparative Examples 1-3 were tested for performance:

[0127] Acid resistance: After the coated keel is canned (can type 691), the acid resistance evaluation is used to represent the corrosion resistance evaluation. The coated can is filled with 1.5% citric acid solution, capped and steamed at 121°C for 30 minutes. After cooling, the sample is taken out to observe the acid spots on the surface, and the acid resistance of the coated keel is evaluated according to "very good", "good", "average", "poor" and "poor".

[0128] Tensile strength test: DI N53 455;

[0129] Elongation test: DI N53 455;

[0130] Thermal shrinkage test: BMS TT 11.

[0131] The test results are shown in Table 1.

[0132]

[0133] It can be seen from the above table that the keel prepared by the present invention has excellent performance in terms of acid resistance, tensile strength, elongation and thermal shrinkage.

[0134] The present invention uses polyvinyl alcohol as a base material to ensure that the adhesive has good bonding force and adhesion, can be fully combined with the PE film and the surface of the strip steel, and adds a curing agent isocyanate to the adhesive, which can significantly improve the curing speed and bonding strength of the adhesive, and is helpful to improve production efficiency and product quality. Ethyl acetate is used as a solvent to ensure that the polyvinyl alcohol can be evenly dispersed in the solution, and the prepared adhesive has good stability and can keep its performance unchanged during storage and use.

[0135] Amino-functional silicone resins may have a synergistic effect with curing agent isocyanate to enhance the curing reaction and bonding strength of the adhesive.

[0136] The modified glass flakes have a synergistic effect with the amino-functionalized silicone resin, which can improve the flexibility and heat resistance of the adhesive.

[0137] The keel prepared by the invention has richer patterns, and the obtained keel is resistant to high temperature and corrosion by strong acid and alkali, and is not easy to be scratched.

[0138] The adhesive provided in this solution adheres the processed PE film to the strip steel, replacing the traditional process of spraying or dipping paint after the strip steel is processed into the keel. The keel surface obtained by this process not only has a colorful pattern, but the color and pattern are not easy to fade. The protective film formed on the surface can greatly improve the corrosion resistance, oxidation resistance, and high temperature resistance of the keel, thereby extending the service life of the keel. At the same time, even if the protective film is scratched during transportation and loading and unloading, it will not affect the overall appearance, making the keel more widely used.

[0139] The present invention improves the corrosion resistance and wear resistance of the coating by modifying the glass flakes, and uses an adhesive with a specific ratio to enhance the bonding strength between the PE film and the steel strip; the transparent PE film can be personalized with color or printed with patterns, which increases the aesthetics and diversity.

[0140] In the ingredients, silicone resin and modified glass flakes have a synergistic effect. Silicone resin can provide good weather resistance and water repellency, while modified glass flakes further enhance the barrier properties and mechanical strength of the coating. The two work together to enable the coated keel to maintain good performance in a variety of environments. At the same time, ceramic micropowder can also increase the hardness and wear resistance of the coating, and work together with other ingredients to improve the overall performance, solving the problems of insufficient corrosion resistance, poor aesthetics, and weak bonding that may exist in existing keels.

[0141] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A method for manufacturing a coated keel, characterized in that: The following steps are involved: S1. Preparing the adhesive, including the following steps: S101, adding 8-12 parts of polyvinyl alcohol and 85-95 parts of water into a reaction kettle according to parts by weight, and heating to 92-98° C. while stirring until the polyvinyl alcohol is completely dissolved to form a polyvinyl alcohol aqueous solution; S102, after obtaining the polyvinyl alcohol aqueous solution, lowering the temperature to 45-55° C.; S103, adding a curing agent, ethyl acetate, silicone resin, modified glass flakes and ceramic powder to a reaction kettle, stirring until completely mixed, to obtain an adhesive, wherein the weight proportions of the curing agent, ethyl acetate, silicone resin, modified glass flakes and ceramic powder are 5-15 parts of the curing agent, 10-20 parts of the ethyl acetate, 20-30 parts of the silicone resin, 15-25 parts of the modified glass flakes and 10-20 parts of the ceramic powder; the curing agent is an isocyanate; the silicone resin is any one of 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane; the preparation of the modified glass flakes comprises the following steps: a. surface treatment: cleaning and drying the glass flakes; b. silane coupling agent treatment: dissolving the silane coupling agent in a solvent, and then immersing the glass flakes in the solution; c. drying and curing: drying the glass flakes treated with the silane coupling agent, removing the solvent, and curing to obtain modified glass flakes; S2. After the transparent PE film is colored or printed with patterns as required, the treated PE film is pasted onto the strip steel using an adhesive; S3. Air-dry and solidify, cut the strip steel vertically, and then process it into keels.

2. The method for manufacturing a coated keel according to claim 1, characterized in that: In the step S101, the speed of the reactor is 100-200 rad / min, and the stirring time is 1-2 h.

3. The method for manufacturing a coated keel according to claim 1, characterized in that: The silane coupling agent is any one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

4. The method for manufacturing a coated keel according to claim 1, characterized in that: The solvent is ethanol.

5. The method for manufacturing a coated keel according to claim 1, characterized in that: In the step b, the weight ratio of the glass flakes, the silane coupling agent and the solvent is glass flakes: silane coupling agent: solvent = 20:1:

40.

6. The method for manufacturing a coated keel according to claim 1, characterized in that: Air drying and curing: Place the strip steel after film application in an operating room with an open ceiling, and use the hot air at 65℃-70℃ blown by a burner to air dry and cure for 36-48 hours.

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