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

Abstract

The present invention relates to the technical field of composite waterproof boards, and proposes a highly weather-resistant multi-layer composite waterproof board and a preparation method thereof. The highly weather-resistant multi-layer composite waterproof board comprises, from top to bottom, a waterproof layer, an adhesive layer, and a metal layer. The raw materials of the waterproof layer include the following components in parts by weight: 50-60 parts of thermoplastic polyolefin resin, 10-20 parts of acrylonitrile-styrene-acrylic acid copolymer, 5-8 parts of maleic anhydride grafted polypropylene, 0.5-1.2 parts of antioxidant, 0.1-1 parts of light stabilizer, 2-6 parts of titanium dioxide, and 30-40 parts of flame retardant. The models of acrylonitrile-styrene-acrylic acid copolymer include LI918 and LI923. The mass ratio of LI918 to LI923 is 1:9 to 9:1. The above technical solution solves the problem of poor weather resistance of waterproof boards in the related art.

Description

Technical Field

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

[0002] With the booming construction industry, waterproofing has become increasingly important in various construction projects. From residential buildings to large commercial complexes, from infrastructure like bridges and tunnels to underground projects, waterproofing effectiveness is directly related to a building's structural safety, service life, and indoor comfort. Whether coping with frequent rainfall in southern China, the extreme cold and heat cycles in northern China, or the high humidity and salinity of coastal areas, the performance of waterproofing panels is extremely demanding.

[0003] Traditional waterproofing materials, such as single-material plastic waterproofing sheets and asphalt-based waterproofing membranes, exhibit numerous limitations when exposed to complex and changing climate conditions and long-term use. While plastic waterproofing sheets offer some waterproofing properties, they exhibit poor weather resistance. Under prolonged exposure to ultraviolet light, they are susceptible to aging and brittleness, leading to decreased waterproofing performance and the occurrence of cracking, leakage, and other issues. Therefore, there is a need for a highly weather-resistant composite waterproofing sheet to address the susceptibility of traditional waterproofing sheets to aging under prolonged exposure to ultraviolet light. Summary of the Invention

[0004] The present invention provides a highly weather-resistant multi-layer composite waterproof board and a preparation method thereof, which solves the problem of poor weather resistance of waterproof boards in the related art.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention provides a highly weather-resistant multi-layer composite waterproof board, which comprises, from top to bottom, a waterproof layer, an adhesive layer, and a metal layer. The raw materials of the waterproof layer include the following components in parts by weight: 50-60 parts of a thermoplastic polyolefin resin, 10-20 parts of an acrylonitrile-styrene-acrylic acid copolymer, 5-8 parts of maleic anhydride grafted polypropylene, 0.5-1.2 parts of an antioxidant, 0.1-1 parts of a light stabilizer, 2-6 parts of titanium dioxide, and 30-40 parts of a flame retardant. The models of the acrylonitrile-styrene-acrylic acid copolymer include LI918 and LI923. The mass ratio of LI918 to LI923 is 1:9-9:1.

[0007] As a further technical solution, the mass ratio of LI918 to LI923 is 1:2~5.

[0008] In the present invention, both models LI918 and LI923 have good weather resistance, LI918 has good fluidity, and LI923 has strong rigidity. By limiting the mass ratio of acrylonitrile-styrene-acrylic acid copolymer LI918 to acrylonitrile-styrene-acrylic acid copolymer LI923 to 1:2~5, the weather resistance of the waterproof board is further improved.

[0009] As a further technical solution, the raw materials of the flame retardant include aluminum hydroxide, a silane coupling agent, and cellulose acetate butyrate.

[0010] In the present invention, the flame retardant composed of aluminum hydroxide, a silane coupling agent, and cellulose acetate butyrate can enhance the interaction between aluminum hydroxide and cellulose acetate butyrate through the silane coupling agent, thereby improving the dispersibility of aluminum hydroxide. Cellulose acetate butyrate promotes the connectivity between aluminum hydroxide and the substrate, thereby improving the tensile strength of the waterproof board.

[0011] As a further technical solution, the mass ratio of the aluminum hydroxide, the silane coupling agent, and the cellulose acetate butyrate is 20:1:0.5~1.

[0012] As a further technical solution, the method for preparing the flame retardant includes the following steps: adding aluminum hydroxide, a silane coupling agent, and cellulose acetate butyrate into an ethanol aqueous solution, stirring, and drying to obtain the flame retardant.

[0013] As a further technical solution, the volume ratio of ethanol to water in the ethanol aqueous solution is 4:1.

[0014] As a further technical solution, the stirring temperature is 45-55° C., and the stirring time is 2-3 h.

[0015] As a further technical solution, the butyryl content in the cellulose acetate butyrate is 38% to 46%.

[0016] In the present invention, the tensile strength of the waterproof board is further improved by limiting the butyryl content in the cellulose acetate butyrate to 38% to 46%.

[0017] As a further technical solution, the silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-560, and silane coupling agent KH-590.

[0018] In the present invention, by adding a silane coupling agent, a hydrophobic layer can be formed on the surface of the aluminum hydroxide, and the bonding force between the aluminum hydroxide and the substrate can be improved, thereby improving the dispersibility of the aluminum hydroxide.

[0019] As a further technical solution, the antioxidant includes one or both of antioxidant B225 and antioxidant B215.

[0020] In the present invention, the antioxidant can capture free radicals generated during the oxidation process of the coiled material, prevent the destruction of the polymer chain, and enable the coiled material to maintain good flexibility, thereby slowing down the oxidation rate of the coiled material and extending its service life.

[0021] As a further technical solution, the raw materials of the adhesive layer include one or both of ethylene-methacrylic acid copolymer and surin resin.

[0022] As a further technical solution, the metal layer is a galvanized steel sheet.

[0023] As a further technical solution, the light stabilizer includes one or both of Tinuvin XT847 and Tinuvin XT850.

[0024] In the present invention, the light stabilizer can inhibit light degradation, maintain the integrity and structural stability of the polymer chain, so that the waterproof membrane can maintain good mechanical properties for a long time and ensure that it can withstand various external forces without damage during use.

[0025] The present invention also provides a method for preparing a highly weather-resistant multi-layer composite waterproof board, which comprises the following steps:

[0026] S1, mixing and co-extruding the raw materials of the waterproof layer and the bonding layer, forming them, compounding, calendering, cooling, and forming them to obtain a composite waterproof layer;

[0027] S2. Hot-pressing the composite waterproof layer and the metal layer to obtain a highly weather-resistant multi-layer composite waterproof board.

[0028] As a further technical solution, the thickness of the waterproof layer is 1~2mm.

[0029] As a further technical solution, the thickness of the adhesive layer is 0.01-0.1 mm.

[0030] As a further technical solution, the thickness of the metal layer is 0.5-1.5 mm.

[0031] The working principle and beneficial effects of the present invention are:

[0032] In the present invention, the waterproof board is obtained by compounding a waterproof layer, an adhesive layer, and a metal layer. The waterproof layer uses a thermoplastic polyolefin resin as a base material. The thermoplastic polyolefin resin has good water resistance, flexibility, and corrosion resistance, ensuring that the waterproof board can effectively waterproof in various complex environments. By adding two acrylonitrile-styrene-acrylic acid copolymers with models LI918 and LI923 and using them in combination with the thermoplastic polyolefin resin, the weather resistance of the two complements each other, further improving the weather resistance of the waterproof layer, and solving the problem of poor weather resistance of the waterproof board. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] In the following examples and comparative examples:

[0035] The model is CAB-171-15S cellulose acetate butyrate with a butyryl content of 17%; the model is CAB-531-1 cellulose acetate butyrate with a butyryl content of 50%; the model is CAB-381-2 cellulose acetate butyrate with a butyryl content of 38%; the model is CAB-553-0.4 cellulose acetate butyrate with a butyryl content of 46%; thermoplastic polyolefin resin, model: TPO H1025; maleic anhydride grafted polypropylene, model: ADMER QB510; ethylene-methacrylic acid copolymer, model: TX8030; sarin resin, model: 8940; acrylonitrile-styrene-acrylic acid copolymer, models LI918, LI923, LI910, all purchased from LG Chem.

[0036] Example 1

[0037] A method for preparing a highly weather-resistant multi-layer composite waterproof board comprises the following steps:

[0038] S1, mixing and co-extruding the raw materials of the waterproof layer and the adhesive layer respectively through a twin-screw extruder, forming, compounding, and then calendering and cooling to form a waterproof layer and an adhesive layer to obtain a composite waterproof layer;

[0039] S2, hot pressing the composite waterproof layer and the galvanized steel plate to obtain a highly weather-resistant multi-layer composite waterproof board;

[0040] Waterproof layer materials: 50 parts thermoplastic polyolefin resin, 10 parts acrylonitrile-styrene-acrylic acid copolymer, 5 parts maleic anhydride grafted polypropylene, 0.5 parts antioxidant B225, 0.1 parts light stabilizer Tinuvin XT847, 2 parts titanium dioxide, 30 parts flame retardant;

[0041] Acrylonitrile-styrene-acrylic acid copolymer is composed of LI918 and LI923 with a mass ratio of 9:1; the flame retardant is aluminum hydroxide;

[0042] Adhesive layer raw material: ethylene-methacrylic acid copolymer;

[0043] The thickness of the waterproof layer is 1mm, the thickness of the bonding layer is 0.01mm, and the thickness of the galvanized steel plate is 1.5mm.

[0044] Example 2

[0045] A method for preparing a highly weather-resistant multi-layer composite waterproof board comprises the following steps:

[0046] S1, mixing and co-extruding the raw materials of the waterproof layer and the adhesive layer respectively by twin-screw extrusion, forming, compounding, and then calendering and cooling to form the waterproof layer and the adhesive layer to obtain a composite waterproof layer;

[0047] S2, hot pressing the composite waterproof layer and the galvanized steel plate to obtain a highly weather-resistant multi-layer composite waterproof board;

[0048] Waterproof layer materials: 60 parts thermoplastic polyolefin resin, 20 parts acrylonitrile-styrene-acrylic acid copolymer, 8 parts maleic anhydride grafted polypropylene, 1.2 parts antioxidant B215, 1 part light stabilizer Tinuvin XT850, 6 parts titanium dioxide, 40 parts flame retardant;

[0049] Acrylonitrile-styrene-acrylic acid copolymer is composed of LI918 and LI923 with a mass ratio of 9:1; the flame retardant is aluminum hydroxide;

[0050] Adhesive layer raw material: Surlyn resin;

[0051] The thickness of the waterproof layer is 2mm, the thickness of the bonding layer is 0.1mm, and the thickness of the galvanized steel plate is 0.5mm.

[0052] Example 3

[0053] The only difference between this embodiment and embodiment 2 is that the acrylonitrile-styrene-acrylic acid copolymer is composed of LI918 and LI923 in a mass ratio of 1:9.

[0054] Example 4

[0055] The only difference between this embodiment and embodiment 2 is that the acrylonitrile-styrene-acrylic acid copolymer is composed of LI918 and LI923 in a mass ratio of 1:2.

[0056] Example 5

[0057] The only difference between this embodiment and embodiment 2 is that the acrylonitrile-styrene-acrylic acid copolymer is composed of LI918 and LI923 in a mass ratio of 1:5.

[0058] Example 6

[0059] The only difference between this embodiment and Example 5 is that the flame retardant is prepared by adding 60 g of aluminum hydroxide and 3 g of silane coupling agent KH-550 to 500 mL of ethanol aqueous solution (ethanol: water volume ratio of 4:1), heating to 45°C and stirring for 3 hours, and obtaining the flame retardant after drying.

[0060] Example 7

[0061] The only difference between this embodiment and Example 5 is that the flame retardant is prepared by adding 60 g of aluminum hydroxide, 3 g of silane coupling agent KH-550, and 1.5 g of cellulose acetate butyrate CAB-171-15S to 500 mL of ethanol aqueous solution (ethanol:water volume ratio of 4:1), heating to 45°C and stirring for 3 hours, and then drying to obtain the flame retardant.

[0062] Example 8

[0063] The only difference between this embodiment and embodiment 7 is that cellulose acetate butyrate CAB-171-15S is replaced with an equal amount of cellulose acetate butyrate CAB-531-1.

[0064] Example 9

[0065] The only difference between this embodiment and embodiment 7 is that cellulose acetate butyrate CAB-171-15S is replaced by an equal amount of cellulose acetate butyrate CAB-381-2.

[0066] Example 10

[0067] The only difference between this embodiment and embodiment 7 is that cellulose acetate butyrate CAB-171-15S is replaced by an equal amount of cellulose acetate butyrate CAB-553-0.4.

[0068] Comparative Example 1

[0069] The only difference between this comparative example and Example 1 is that the model of the acrylonitrile-styrene-acrylic acid copolymer is only LI918.

[0070] Comparative Example 2

[0071] The only difference between this comparative example and Example 1 is that the model of the acrylonitrile-styrene-acrylic acid copolymer is only LI923.

[0072] Comparative Example 3

[0073] The only difference between this comparative example and Example 1 is that the model of the acrylonitrile-styrene-acrylic acid copolymer is only LI910.

[0074] Experimental Example 1

[0075] The waterproof layer raw materials in Examples 1 to 5 and Comparative Examples 1 to 3 were mixed and extruded to prepare dumbbell I-type specimens with a thickness of 1.2 mm. The tensile strength and the tensile strength after accelerated aging in artificial climate (irradiation time of 1500 h) were tested according to the method in GB 27789-2011 "Thermoplastic Polyolefin (TPO) Waterproof Membrane". The test results are shown in Table 1.

[0076] Table 1 Weather resistance test results of waterproof layer

[0077]

[0078] As can be seen from Table 1, the tensile strength retention rate of the waterproof layer prepared in Examples 1 to 5 after aging is higher than that of Comparative Examples 1 to 3, indicating that the addition of acrylonitrile-styrene-acrylic acid copolymers with models LI918 and LI923 to the waterproof layer can improve the weather resistance of the waterproof board.

[0079] Experimental Example 2

[0080] The waterproof layer materials in Examples 5 to 10 were mixed and extruded to prepare dumbbell I-type specimens with a thickness of 1.2 mm. The tensile strength was tested according to the method in GB 27789-2011 "Thermoplastic Polyolefin (TPO) Waterproof Membrane". The test results are shown in Table 2.

[0081] Table 2 Waterproof layer tensile strength test results

[0082]

[0083] As can be seen from Table 2, the tensile strength of the waterproof layer prepared in Examples 9 to 10 is higher than that in Examples 5 to 8, indicating that when the butyryl content in cellulose acetate butyrate is 38% to 46%, the tensile strength of the waterproof board can be further improved.

[0084] The above are only 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly weather-resistant multi-layer composite waterproof board, characterized in that: The invention comprises, from top to bottom, a waterproof layer, an adhesive layer, and a metal layer; the raw materials of the waterproof layer include the following components in parts by weight: 50-60 parts of thermoplastic polyolefin resin, 10-20 parts of acrylonitrile-styrene-acrylic acid copolymer, 5-8 parts of maleic anhydride grafted polypropylene, 0.5-1.2 parts of antioxidant, 0.1-1 parts of light stabilizer, 2-6 parts of titanium dioxide, and 30-40 parts of flame retardant; the models of the acrylonitrile-styrene-acrylic acid copolymer include LI918 and LI923; the mass ratio of LI918 to LI923 is 1:9-9:

1.

2. The highly weather-resistant multi-layer composite waterproof board according to claim 1, characterized in that: The mass ratio of LI918 to LI923 is 1:2-5.

3. The highly weather-resistant multi-layer composite waterproof board according to claim 1, characterized in that: The raw materials of the flame retardant include aluminum hydroxide, a silane coupling agent and cellulose acetate butyrate.

4. The highly weather-resistant multi-layer composite waterproof board according to claim 3, characterized in that: The mass ratio of the aluminum hydroxide, the silane coupling agent, and the cellulose acetate butyrate is 20:1:0.5-1.

5. The highly weather-resistant multi-layer composite waterproof board according to claim 3, characterized in that: The silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-560, and silane coupling agent KH-590.

6. The highly weather-resistant multi-layer composite waterproof board according to claim 1, characterized in that: The antioxidant includes one or both of antioxidant B225 and antioxidant B215.

7. The highly weather-resistant multi-layer composite waterproof board according to claim 1, characterized in that: The raw materials of the adhesive layer include one or both of ethylene-methacrylic acid copolymer and surin resin.

8. The highly weather-resistant multi-layer composite waterproof board according to claim 1, characterized in that: The light stabilizer includes one or both of Tinuvin XT847 and Tinuvin XT850.

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