A highly weather-resistant metal composite waterproof board and its preparation method

Abstract

The present invention relates to the technical field of waterproof boards, and provides a highly weather-resistant metal composite waterproof board and a preparation method thereof. The highly weather-resistant metal composite waterproof board sequentially comprises a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE board from top to bottom. The organic film layer comprises one of a PVC film, a TPO film, an EPDM film, a TPR film, and a fluorocarbon film. The bonding layer comprises the following components in parts by weight: 65-75 parts of SEBS, 28-36 parts of polyvinyl acetate, 5-8 parts of tackifier, 10-15 parts of filler, and 2-4 parts of stabilizer. The filler comprises zinc oxide-coated potassium titanate whiskers. Through the above technical solution, the problems of low peel strength and poor weather resistance of the metal composite waterproof board in the related art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof boards, and specifically, to a highly weather-resistant metal composite waterproof board and a preparation method thereof. Background Art

[0002] The combined use of metal plates and polymer waterproof boards is usually achieved through specific adhesives or bonding techniques, and the performance of these adhesives also directly affects the peel strength between the two. The peel strength refers to the maximum tensile force at which the heat-sealed layer does not delaminate under a certain external force. Therefore, selecting a suitable adhesive and / or the correct installation method is crucial for ensuring good bonding between the two. Existing metal composite waterproof boards also have the defect of poor interlayer bonding. Especially when used outdoors for a long time, the polymer substrate layer is not weather-resistant and is prone to aging, seriously reducing the service life of the waterproof board. Therefore, developing a metal composite waterproof board with excellent interlayer peel strength and high weather resistance will be of great significance for expanding the application fields of metal composite waterproof boards. Summary of the Invention

[0003] The present invention provides a highly weather-resistant metal composite waterproof board and a preparation method thereof, which solve the problems of low peel strength and poor weather resistance of metal composite waterproof boards in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides a highly weather-resistant metal composite waterproof board, which sequentially includes a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE board from top to bottom;

[0006] The organic film layer includes one of a PVC film, a TPO film, an EPDM film, a TPR film, and a fluorocarbon film;

[0007] The bonding layer includes the following components in parts by weight: 65 - 75 parts of SEBS, 28 - 36 parts of polyvinyl acetate, 5 - 8 parts of tackifier, 10 - 15 parts of filler, and 2 - 4 parts of stabilizer;

[0008] The filler includes potassium titanate whiskers coated with zinc oxide.

[0009] As a further technical solution, the weather-resistant coating includes the following components in parts by weight: 100 parts of resin, 1 - 3 parts of curing agent, 5 - 10 parts of weather-resistant filler, and 1 - 1.5 parts of ultraviolet absorber;

[0010] The metal plate includes one of a stainless steel plate, a stainless iron plate, an aluminum alloy plate, and a galvanized steel plate.

[0011] As a further technical solution, the stabilizer includes one or more of calcium stearate, light stabilizer 944, and light stabilizer 770; the ultraviolet absorber includes UV-1130 and / or UV-531; the weather-resistant filler includes titanium dioxide or silica; the resin includes one of epoxy resin and polyimide resin; the curing agent is a polyamine.

[0012] As a further technical solution, the thickness of the weather-resistant coating is 50~90μm, the thickness of the organic film layer is 100~200μm, the thickness of the bonding layer is 0.1~0.3mm, the thickness of the metal plate is 0.1~0.5mm, the thickness of the corrosion-resistant layer is 200~300μm, and the thickness of the PE plate is 0.2~0.4mm.

[0013] As a further technical solution, the preparation method of the zinc oxide-coated potassium titanate whiskers includes the following steps: mixing a zinc salt solution, potassium titanate whiskers, and an organic acid solution, drying, and roasting to obtain zinc oxide-coated potassium titanate whiskers.

[0014] As a further technical solution, the mass ratio of the zinc salt in the zinc salt solution to the potassium titanate whiskers is 1:1~2.

[0015] As a further technical solution, the mass-volume ratio of the zinc salt to the solvent in the zinc salt solution is 1g:5~10mL; the mass-volume ratio of the organic acid to the solvent in the organic acid solution is 1g:3~4mL; the mass-volume ratio of the zinc salt to the organic acid is 1g:4~5mL.

[0016] As a further technical solution, the zinc salt includes one or more of zinc chloride, zinc acetate, and zinc nitrate; the organic acid includes one or more of oxalic acid, acetic acid, and tartaric acid.

[0017] As a further technical solution, the filler further includes aluminum borate whiskers.

[0018] In the present invention, by compounding the zinc oxide-coated potassium titanate whiskers with the aluminum borate whiskers, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0019] As a further technical solution, the mass ratio of the aluminum borate whiskers to the zinc oxide-coated potassium titanate whiskers is 1:3~5:3.

[0020] In the present invention, by limiting the mass ratio of the aluminum borate whiskers to the zinc oxide-coated potassium titanate whiskers to 1:3~5:3, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0021] As a further technical solution, the tackifier includes hydrogenated rosin pentaerythritol ester and styrene-modified terpene resin; the mass ratio of the hydrogenated rosin pentaerythritol ester to the styrene-modified terpene resin is 4:1 to 3.

[0022] In the present invention, the tackifier includes hydrogenated rosin pentaerythritol ester and styrene-modified terpene resin, and when the mass ratio of the hydrogenated rosin pentaerythritol ester to the styrene-modified terpene resin is 4:1 to 3, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0023] The present invention also provides a method for preparing the high-weather-resistant metal composite waterproof board, including the following steps: after mixing the components of the weather-resistant coating, organic film layer, bonding layer, corrosion-resistant layer, and PE board respectively, the organic film layer and the bonding layer are extruded onto the upper surface of the metal plate from top to bottom in sequence, the corrosion-resistant layer and the PE board are extruded onto the lower surface of the metal plate from inside to outside in sequence, and then the weather-resistant coating is coated on the upper surface of the organic film layer, and hot pressing is performed to obtain the high-weather-resistant metal composite waterproof board.

[0024] The working principle and beneficial effects of the present invention are as follows:

[0025] In the present invention, the metal composite waterproof board is provided with a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE board from top to bottom in sequence. Zinc oxide-coated potassium titanate whiskers are added as fillers in the bonding layer, which significantly improves the peel strength and weather resistance of the metal composite waterproof board. Specific Embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0027] In the following embodiments and comparative examples, the model of SEBS is G1654; the weight-average molecular weight of polyvinyl acetate is 100,000; the model of epoxy resin is E51; the model of styrene-modified terpene resin is Sylvares ZT105LT.

[0028] Example 1

[0029] The high-weather-resistant metal composite waterproof board includes a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE board from top to bottom in sequence;

[0030] The thickness of the weather-resistant coating is 70 μm, the thickness of the organic film layer is 150 μm, the thickness of the bonding layer is 0.2 mm, the thickness of the metal plate is 0.3 mm, the thickness of the corrosion-resistant layer is 250 μm, and the thickness of the PE plate is 0.3 mm; the organic film layer is a PVC film and comprises the following components in parts by weight: 100 parts of PVC (model S-1000), 5 parts of calcium carbonate, and 1 part of antioxidant 1010; the metal plate is a stainless steel plate.

[0031] The weather-resistant coating comprises the following components in parts by weight: 100 parts of epoxy resin, 1 part of tetraethylenepentamine, 5 parts of titanium dioxide, and 1 part of ultraviolet absorber UV-531.

[0032] The bonding layer comprises the following components in parts by weight: 65 parts of SEBS, 28 parts of polyvinyl acetate, 5 parts of tackifier, 10 parts of filler, and 2 parts of calcium stearate; the tackifier is hydrogenated rosin pentaerythritol ester.

[0033] The filler comprises zinc oxide-coated potassium titanate whiskers, and the preparation method of the zinc oxide-coated potassium titanate whiskers comprises the following steps: mixing zinc chloride solution, potassium titanate whiskers, and oxalic acid solution, drying, and roasting to obtain zinc oxide-coated potassium titanate whiskers.

[0034] The mass-volume ratio of zinc chloride to water in the zinc chloride solution is 1 g:10 mL; the mass-volume ratio of oxalic acid to solvent water in the oxalic acid solution is 1 g:3 mL; the mass-volume ratio of zinc chloride to oxalic acid is 1 g:4 mL.

[0035] The preparation method of the highly weather-resistant metal composite waterproof board comprises the following steps: respectively mixing the components of the weather-resistant coating, the organic film layer, the bonding layer, the corrosion-resistant layer, and the PE plate, extruding the organic film layer and the bonding layer onto the upper surface of the metal plate from top to bottom in sequence, extruding the corrosion-resistant layer and the PE plate onto the lower surface of the metal plate from inside to outside in sequence, coating the weather-resistant coating on the upper surface of the organic film layer, and hot-pressing to form the highly weather-resistant metal composite waterproof board.

[0036] Example 2

[0037] The highly weather-resistant metal composite waterproof board sequentially comprises a weather-resistant coating, an organic film layer, a bonding layer, a metal plate, a corrosion-resistant layer, and a PE plate from top to bottom.

[0038] The thickness of the weather-resistant coating is 50 μm, the thickness of the organic film layer is 200 μm, the thickness of the bonding layer is 0.3 mm, the thickness of the metal plate is 0.1 mm, the thickness of the corrosion-resistant layer is 300 μm, and the thickness of the PE plate is 0.2 mm; the organic film layer is a PVC film and comprises the following components in parts by weight: 100 parts of PVC (model S-1000), 5 parts of calcium carbonate, and 1 part of antioxidant 1010; the metal plate is a stainless steel plate.

[0039] The weather-resistant coating comprises the following components in parts by weight: 100 parts of epoxy resin, 2 parts of tetraethylenepentamine, 7 parts of titanium dioxide, and 1.3 parts of ultraviolet absorber UV-1130;

[0040] The adhesive layer comprises the following components in parts by weight: 70 parts of SEBS, 32 parts of polyvinyl acetate, 6 parts of tackifier, 12 parts of filler, 2 parts of calcium stearate, and 1 part of light stabilizer 770; the tackifier is hydrogenated rosin pentaerythritol ester;

[0041] The filler comprises potassium titanate whiskers coated with zinc oxide. The preparation method of the potassium titanate whiskers coated with zinc oxide comprises the following steps: mixing zinc chloride solution, potassium titanate whiskers, and oxalic acid solution, drying, and roasting to obtain potassium titanate whiskers coated with zinc oxide;

[0042] The mass-volume ratio of zinc chloride to water in the zinc chloride solution is 1 g:5 mL; the mass-volume ratio of oxalic acid to solvent water in the oxalic acid solution is 1 g:3 mL; the mass-volume ratio of zinc chloride to oxalic acid is 1 g:4 mL;

[0043] The preparation method of the highly weather-resistant metal composite waterproof board comprises the following steps: mixing the components of the weather-resistant coating, organic film layer, adhesive layer, corrosion-resistant layer, and PE board respectively, then extruding the organic film layer and the adhesive layer onto the upper surface of the metal plate from top to bottom in sequence, and extruding the corrosion-resistant layer and the PE board onto the lower surface of the metal plate from inside to outside in sequence, and then coating the weather-resistant coating on the upper surface of the organic film layer and hot-pressing to form the highly weather-resistant metal composite waterproof board.

[0044] Example 3

[0045] The highly weather-resistant metal composite waterproof board comprises, from top to bottom in sequence, a weather-resistant coating, an organic film layer, an adhesive layer, a metal plate, a corrosion-resistant layer, and a PE board;

[0046] The thickness of the weather-resistant coating is 90 μm, the thickness of the organic film layer is 100 μm, the thickness of the adhesive layer is 0.1 mm, the thickness of the metal plate is 0.5 mm, the thickness of the corrosion-resistant layer is 200 μm, and the thickness of the PE board is 0.4 mm; the organic film layer is a PVC film and comprises the following components in parts by weight: 100 parts of PVC (model S-1000), 5 parts of calcium carbonate, and 1 part of antioxidant 101; the metal plate is a stainless steel plate;

[0047] The weather-resistant coating comprises the following components in parts by weight: 100 parts of epoxy resin, 3 parts of tetraethylenepentamine, 10 parts of titanium dioxide, and 1.5 parts of ultraviolet absorber UV-1130;

[0048] The adhesive layer comprises the following components in parts by weight: 75 parts of SEBS, 36 parts of polyvinyl acetate, 8 parts of tackifier, 15 parts of filler, and 4 parts of calcium stearate; the tackifier is hydrogenated rosin pentaerythritol ester;

[0049] The filler includes potassium titanate whiskers coated with zinc oxide. The preparation method of the potassium titanate whiskers coated with zinc oxide includes the following steps: mixing a zinc chloride solution, potassium titanate whiskers, and an oxalic acid solution, drying, and roasting to obtain potassium titanate whiskers coated with zinc oxide;

[0050] The mass-volume ratio of zinc chloride to water in the zinc chloride solution is 1 g:10 mL; the mass-volume ratio of oxalic acid to solvent water in the oxalic acid solution is 1 g:4 mL; the mass-volume ratio of zinc chloride to oxalic acid is 1 g:5 mL;

[0051] The preparation method of the highly weather-resistant metal composite waterproof board includes the following steps: after mixing the components of the weather-resistant coating, organic film layer, adhesive layer, corrosion-resistant layer, and PE board respectively, extruding the organic film layer and the adhesive layer onto the upper surface of the metal plate from top to bottom in sequence, extruding the corrosion-resistant layer and the PE board onto the lower surface of the metal plate from inside to outside in sequence, then coating the weather-resistant coating on the upper surface of the organic film layer, and hot pressing to form the highly weather-resistant metal composite waterproof board.

[0052] Example 4

[0053] The difference between this example and Example 3 is only that the potassium titanate whiskers coated with zinc oxide are replaced with aluminum borate whiskers.

[0054] Example 5

[0055] The difference between this example and Example 3 is only that the filler is aluminum borate whiskers and potassium titanate whiskers coated with zinc oxide with a mass ratio of 1:4.

[0056] Example 6

[0057] The difference between this example and Example 3 is only that the filler is aluminum borate whiskers and potassium titanate whiskers coated with zinc oxide with a mass ratio of 2:1.

[0058] Example 7

[0059] The difference between this example and Example 3 is only that the filler is aluminum borate whiskers and potassium titanate whiskers coated with zinc oxide with a mass ratio of 1:3.

[0060] Example 8

[0061] The difference between this example and Example 3 is only that the filler is aluminum borate whiskers and potassium titanate whiskers coated with zinc oxide with a mass ratio of 5:3.

[0062] Example 9

[0063] The difference between this example and Example 8 is only that the tackifier is styrene-modified terpene resin.

[0064] Example 10

[0065] The difference between this example and Example 8 is only that the tackifier is a hydrogenated rosin pentaerythritol ester and a styrene-modified terpene resin with a mass ratio of 5:1.

[0066] Example 11

[0067] The difference between this example and Example 8 is only that the tackifier is a hydrogenated rosin pentaerythritol ester and a styrene-modified terpene resin with a mass ratio of 4:4.

[0068] Example 12

[0069] The difference between this example and Example 8 is only that the tackifier is a hydrogenated rosin pentaerythritol ester and a styrene-modified terpene resin with a mass ratio of 4:1.

[0070] Example 13

[0071] The difference between this example and Example 8 is only that the tackifier is a hydrogenated rosin pentaerythritol ester and a styrene-modified terpene resin with a mass ratio of 4:3.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 3 is only that the zinc oxide-coated potassium titanate whiskers are replaced with potassium titanate whiskers.

[0074] Comparative Example 2

[0075] The difference between this comparative example and Example 3 is only that the zinc oxide-coated potassium titanate whiskers are replaced with zinc oxide.

[0076] Comparative Example 3

[0077] The difference between this comparative example and Example 3 is only that the zinc oxide-coated potassium titanate whiskers are not added.

[0078] Peel strength: Tested in accordance with the standard T-CBMCA 017-2020 "Coated Steel Sheets for Building Use";

[0079] Weather resistance: After the sample is aged by xenon lamp for 10,000 h, the peel strength test after aging is carried out in accordance with the standard T-CBMCA 017-2020 "Coated Steel Sheets for Building Use", and the peel strength change rate is calculated. The peel strength change rate = [(peel strength before aging - peel strength after aging) / peel strength before aging] × 100%;

[0080] The results are shown in Table 1.

[0081] Table 1 Performance test results

[0082]

[0083] By comparing the data of Examples 1 to 13 and Comparative Examples 1 to 3, it is found that compared with Comparative Examples 1 to 3, the interfacial peel strength between the adhesive layer and the metal plate of the metal composite waterproof board prepared in Examples 1 to 13 is higher, and the change rate of the peel strength is smaller. It shows that the metal composite waterproof board is provided with a weather-resistant coating, an organic film layer, an adhesive layer, a metal plate, a corrosion-resistant layer, and a PE plate in sequence from top to bottom. Adding zinc oxide-coated potassium titanate whiskers as a filler to the adhesive layer significantly improves the peel strength and weather resistance of the metal composite waterproof board.

[0084] By comparing the data of Examples 3 to 8, it is found that compared with Examples 3 to 4, the interfacial peel strength between the adhesive layer and the metal plate of the metal composite waterproof board prepared in Examples 5 to 8 is higher, and the change rate of the peel strength is smaller. It shows that by compounding zinc oxide-coated potassium titanate whiskers and aluminum borate whiskers, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0085] By comparing the data of Examples 5 to 8, it is found that compared with Examples 5 to 6, the interfacial peel strength between the adhesive layer and the metal plate of the metal composite waterproof board prepared in Examples 7 to 8 is higher, and the change rate of the peel strength is smaller. It shows that by limiting the mass ratio of aluminum borate whiskers to zinc oxide-coated potassium titanate whiskers to 1:3 to 5:3, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0086] By comparing the data of Examples 8 to 13, it is found that compared with Examples 8 to 11, the interfacial peel strength between the adhesive layer and the metal plate of the metal composite waterproof board prepared in Examples 12 to 13 is higher, and the change rate of the peel strength is smaller. It shows that the tackifier includes hydrogenated rosin pentaerythritol ester and styrene-modified terpene resin, and when the mass ratio of hydrogenated rosin pentaerythritol ester to styrene-modified terpene resin is 4:1 to 3, the peel strength and weather resistance of the metal composite waterproof board are further improved.

[0087] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly weather-resistant metal composite waterproof board, characterized in that, It successively includes a weather-resistant coating, an organic film layer, an adhesive layer, a metal plate, a corrosion-resistant layer, and a PE plate from top to bottom; The organic film layer includes one of a PVC film, a TPO film, an EPDM film, a TPR film, and a fluorocarbon film; The adhesive layer includes the following components in parts by weight: 65-75 parts of SEBS, 28-36 parts of polyvinyl acetate, 5-8 parts of tackifier, 10-15 parts of filler, and 2-4 parts of stabilizer; the filler includes potassium titanate whiskers coated with zinc oxide; The filler further includes aluminum borate whiskers; The mass ratio of the aluminum borate whiskers to the potassium titanate whiskers coated with zinc oxide is 1:3 to 5:3; The tackifier includes hydrogenated rosin pentaerythritol ester and styrene-modified terpene resin; the mass ratio of the hydrogenated rosin pentaerythritol ester to the styrene-modified terpene resin is 4:1 to 3.

2. The high-weather-resistant metal composite waterproof board according to claim 1, wherein The weather-resistant coating includes the following components in parts by weight: 100 parts of resin, 1-3 parts of curing agent, 5-10 parts of weather-resistant filler, and 1-1.5 parts of ultraviolet absorber; The metal plate includes one of a stainless steel plate, a non-ferrous stainless steel plate, an aluminum alloy plate, and a galvanized steel plate.

3. The high weather-resistant metal composite waterproof board according to claim 1, characterized in that, The preparation method of the potassium titanate whiskers coated with zinc oxide includes the following steps: mixing a zinc salt solution, potassium titanate whiskers, and an organic acid solution, drying, and roasting to obtain potassium titanate whiskers coated with zinc oxide.

4. The highly weather-resistant metal composite waterproof board according to claim 3, characterized in that, The mass ratio of the zinc salt in the zinc salt solution to the potassium titanate whiskers is 1:1 to 2.

5. A highly weather-resistant metal composite waterproof board according to claim 3, characterized in that, The mass-volume ratio of the zinc salt to the solvent in the zinc salt solution is 1 g:5-10 mL; the mass-volume ratio of the organic acid to the solvent in the organic acid solution is 1 g:3-4 mL; the mass-volume ratio of the zinc salt to the organic acid is 1 g:4-5 mL.

6. The high-weather-resistant metal composite waterproof board according to claim 5, characterized in that, The zinc salt includes one or more of zinc chloride, zinc acetate, and zinc nitrate; the organic acid includes one or more of oxalic acid, acetic acid, and tartaric acid.

7. A method for preparing a highly weather-resistant metal composite waterproof board according to any one of claims 1 to 6, characterized in that, It includes the following steps: After mixing the components of the weather-resistant coating, the organic film layer, the adhesive layer, the corrosion-resistant layer, and the PE plate respectively, the organic film layer and the adhesive layer are successively extruded onto the upper surface of the metal plate from top to bottom, and the corrosion-resistant layer and the PE plate are successively extruded onto the lower surface of the metal plate from inside to outside. Then, the weather-resistant coating is coated on the upper surface of the organic film layer, and hot pressing is performed to obtain a highly weather-resistant metal composite waterproof plate.

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