High-strength EVA waterproof board and preparation method thereof

Abstract

The invention relates to the technical field of engineering waterproofing, and provides a high-strength EVA waterproof board and a preparation method thereof.The high-strength EVA waterproof board is prepared from, by weight, 25-35 parts of EVA, 10-20 parts of high-density polyethylene, 10-15 parts of low-density polyethylene, 5-10 parts of filler, 1-3 parts of antioxidant, 3-5 parts of plasticizer and 2-10 parts of enhancer; the reinforcing agent is a polyamine compound. According to the technical scheme, the problem of low strength of the EVA waterproof plate in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering waterproofing, and in particular to a high-strength EVA waterproofing board and a preparation method thereof. Background Art

[0002] EVA waterproof board, namely ethylene-vinyl acetate copolymer waterproof board, is a polymer waterproof barrier material. It uses EVA resin as the main raw material and is made by adding various additives through a special process. EVA waterproof board is widely used in the field of building waterproofing and water conservancy engineering due to its good flexibility, weather resistance, chemical corrosion resistance and excellent waterproof performance. However, EVA waterproof board still has some problems in terms of strength. For example, in the construction of mountain tunnels, the tunnel may pass through different geological layers, such as rock fracture zones and faults. The geological stress in these areas is complex, and the strength requirements of waterproof boards are high; and for some underground or underwater projects with greater depths, such as deep-sea tunnels and large underground pools, waterproof boards need to withstand large water pressure for a long time. If the strength of the EVA waterproof board is insufficient, it may be subjected to slight external forces during the construction process, resulting in failure of the waterproof function, damage to the engineering structure, and increase the maintenance cost of the engineering structure. Therefore, the low strength of the EVA waterproof board is a problem that needs to be solved urgently. Summary of the invention

[0003] The invention provides a high-strength EVA waterproof board and a preparation method thereof, which solves the problem of low strength of the EVA waterproof board in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a high-strength EVA waterproof board, comprising the following component raw materials in parts by weight: 25-35 parts of EVA, 10-20 parts of high-density polyethylene, 10-15 parts of low-density polyethylene, 5-10 parts of filler, 1-3 parts of antioxidant, 3-5 parts of plasticizer, and 2-10 parts of reinforcing agent; The reinforcing agent is a polyamine compound.

[0005] As a further technical solution, the mass ratio of the reinforcing agent to the EVA is 1-2:10.

[0006] As a further technical solution, the polyamine compound includes one or more of polyamide, polyacrylamide, and polyethyleneimine.

[0007] In the present invention, polyethyleneimine is preferably used as a reinforcing agent. The high polarity of the imine group can enhance the bonding strength between polyethyleneimine and the EVA matrix, and its vinyl structure can increase the flexibility and steric hindrance of the molecular chain, improve the compatibility and mutual entanglement with the EVA matrix, and further enhance the strength and toughness of the EVA waterproof board.

[0008] As a further technical solution, the filler includes one or more of kaolin, montmorillonite and talc.

[0009] As a further technical solution, when the filler is montmorillonite, the montmorillonite is modified montmorillonite, and the modifier of the modified montmorillonite is an epoxy acrylate compound.

[0010] In the present invention, the epoxy acrylate compound is used to modify the montmorillonite, and the modified montmorillonite can significantly improve its dispersibility and compatibility in the EVA matrix, thereby improving the strength and toughness of the EVA waterproof board.

[0011] As a further technical solution, the epoxy olefinic acid compound includes one or more of (2E)-3-(1,3-benzodioxolan-5-yl)-2-propenoic acid, (E)-4-(1,3-benzodioxolan-5-yl)-4-oxo-2-butenoic acid, and 8-{3-[(2E)-2-octen-1-yl]-2-oxiranyl}octanoic acid.

[0012] As a further technical solution, in the raw material of the modified montmorillonite, the mass ratio of the modifier to the montmorillonite is 1 to 2:20; The preparation method of the modified montmorillonite comprises the following steps: dissolving a modifier in a solvent, adding the montmorillonite to disperse uniformly, modifying, filtering and drying to obtain the modified montmorillonite.

[0013] As a further technical solution, the antioxidant includes one or more of antioxidant DPA, antioxidant RD, and antioxidant BLE.

[0014] As a further technical solution, the plasticizer includes one or more of dibutyl phthalate, dioctyl phthalate, and dioctyl adipate.

[0015] The present invention also provides a method for preparing a high-strength EVA waterproof board, comprising the following steps: weighing the component raw materials in parts by weight, mixing them evenly, blending and granulating, melt extruding, and molding to obtain the high-strength EVA waterproof board.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, the waterproof board uses EVA as a raw material, and a polyamine compound is added as a reinforcing agent. Through the hydrogen bonding effect and polar interaction between the reinforcing agent and the EVA matrix, the bonding strength between the two is enhanced, and the internal bonding force of the waterproof board material is enhanced, so that the EVA waterproof board forms an effective stress transfer network, thereby improving the strength of the EVA waterproof board and also improving the toughness. DETAILED DESCRIPTION

[0017] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0018] In the following examples and comparative examples: EVA: Model EV180; High-density polyethylene: model 8008H; Low-density polyethylene: model 2426H; Polyamide: model PA6 GF20; Polyacrylamide: cationic, solid content is 90%, weight average molecular weight is 12 million; Polyethyleneimine: analytical grade, manufactured by Shaoguan Chengfeng Chemical Co., Ltd. Montmorillonite, kaolin, talc: specification is 325 mesh.

[0019] Example 1 A preparation method of a high-strength EVA waterproof board comprises the following steps: weighing 25 parts of EVA, 10 parts of high-density polyethylene, 10 parts of low-density polyethylene, 5 parts of kaolin, 1 part of antioxidant DPA, 3 parts of dibutyl phthalate and 2 parts of polyamide, mixing and stirring for 30 minutes, blending and granulating through a twin-screw extruder, and melt-extruding through a single-screw extruder to form a high-strength EVA waterproof board.

[0020] Example 2 A preparation method of a high-strength EVA waterproof board comprises the following steps: weighing 30 parts of EVA, 15 parts of high-density polyethylene, 12 parts of low-density polyethylene, 8 parts of montmorillonite, 2 parts of antioxidant BLE, 4 parts of dioctyl phthalate and 3 parts of polyamide, mixing and stirring for 30 minutes, blending and granulating through a twin-screw extruder, and melt-extruding through a single-screw extruder to form a high-strength EVA waterproof board.

[0021] Example 3 A preparation method of a high-strength EVA waterproof board comprises the following steps: weighing 35 parts of EVA, 20 parts of high-density polyethylene, 15 parts of low-density polyethylene, 10 parts of talcum powder, 3 parts of antioxidant RD, 5 parts of dioctyl adipate and 10 parts of polyamide, mixing and stirring for 30 minutes, blending and granulating through a twin-screw extruder, and melt-extruding through a single-screw extruder to form a high-strength EVA waterproof board.

[0022] Example 4 Compared with Example 2, the difference of Example 4 is that the added amount of polyamide is 6 parts.

[0023] Example 5 Compared with Example 4, Example 5 is different in that polyamide is replaced by an equal amount of polyacrylamide.

[0024] Example 6 Compared with Example 4, Example 6 is different in that polyamide is replaced by an equal amount of polyethyleneimine.

[0025] Example 7 The preparation method of modified montmorillonite comprises the following steps: dissolving 1 part of 8-{3-[(2E)-2-octen-1-yl]-2-oxiranyl}octanoic acid in 200 parts of acetone, adding 20 parts of montmorillonite and dispersing the mixture evenly, heating the mixture to 50°C and performing modification for 6 hours, filtering the mixture and drying the mixture to obtain modified montmorillonite; Compared with Example 6, the difference of Example 7 is that the montmorillonite is replaced by an equal amount of modified montmorillonite obtained by the above preparation method.

[0026] Example 8 Compared with Example 7, the difference in Example 8 is that the amount of 8-{3-[(2E)-2-octen-1-yl]-2-oxiranyl}octanoic acid added is 2 parts.

[0027] Example 9 Compared with Example 8, Example 9 is different in that 8-{3-[(2E)-2-octen-1-yl]-2-oxiranyl}octanoic acid is replaced with an equal amount of (2E)-3-(1,3-benzodioxol-5-yl)-2-propenoic acid.

[0028] Comparative Example 1 Compared with Example 2, Comparative Example 1 is different in that no polyamide is added.

[0029] The EVA waterproof sheets prepared in Examples 1 to 9 and Comparative Example 1 were tested according to the following method: 1. Elongation at break: According to the test method specified in Q / CR 562.1-2018 "Railway Tunnel Drainage Materials Part 1: Waterproof Board", the elongation at break of the test sample is tested.

[0030] 2. Puncture strength: Test the puncture strength of the sample according to the test method specified in Q / CR 562.1-2018 "Railway Tunnel Drainage Materials Part 1: Waterproof Boards".

[0031] The test results are shown in the following table: Table 1 Performance test results of EVA waterproof sheets prepared in Examples 1 to 9 and Comparative Example 1

[0032] Compared with comparative example 1, polyamide, a reinforcing agent, is added in embodiment 2. As a result, the elongation at break and the puncture strength of embodiment 2 are better than those of comparative example 1, indicating that the addition of the reinforcing agent can improve the strength and toughness of the EVA waterproof board.

[0033] Compared with Example 4, Example 5 adds polyacrylamide as a reinforcing agent, and Example 6 adds polyethyleneimine as a reinforcing agent. As a result, the elongation at break and the puncture strength of Example 6 are better than those of Examples 4 and 5, indicating that when the added reinforcing agent is polyethyleneimine, the obtained EVA waterproof board has better strength and toughness.

[0034] Compared with Example 6, Examples 7 to 9 added modified montmorillonite as a filler. As a result, the elongation at break and the puncture strength of Examples 7 to 9 were better than those of Example 6, indicating that the addition of modified montmorillonite can further improve the strength and toughness of the EVA waterproof board.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength EVA waterproof board, characterized in that: The invention comprises the following raw materials in parts by weight: 25-35 parts of EVA, 10-20 parts of high-density polyethylene, 10-15 parts of low-density polyethylene, 5-10 parts of filler, 1-3 parts of antioxidant, 3-5 parts of plasticizer and 2-10 parts of reinforcing agent; the reinforcing agent is a polyamine compound.

2. A high-strength EVA waterproof board according to claim 1, characterized in that: The mass ratio of the reinforcing agent to the EVA is 1-2:

10.

3. A high-strength EVA waterproof board according to claim 1, characterized in that: The polyamine compound includes one or more of polyamide, polyacrylamide and polyethyleneimine.

4. A high-strength EVA waterproof board according to claim 1, characterized in that: The filler includes one or more of kaolin, montmorillonite and talc.

5. The high-strength EVA waterproof board according to claim 1, characterized in that: When the filler is montmorillonite, the montmorillonite is modified montmorillonite, and the modifier of the modified montmorillonite is an epoxy acrylate compound.

6. A high-strength EVA waterproof board according to claim 5, characterized in that: The epoxy olefinic acid compound includes one or more of (2E)-3-(1,3-benzodioxolan-5-yl)-2-propenoic acid, (E)-4-(1,3-benzodioxolan-5-yl)-4-oxo-2-butenoic acid, and 8-{3-[(2E)-2-octen-1-yl]-2-oxiranyl}octanoic acid.

7. A high-strength EVA waterproof board according to claim 5, characterized in that: In the raw material of the modified montmorillonite, the mass ratio of the modifier to the montmorillonite is 1-2:20; The preparation method of the modified montmorillonite comprises the following steps: dissolving a modifier in a solvent, adding the montmorillonite to disperse uniformly, modifying, filtering and drying to obtain the modified montmorillonite.

8. The high-strength EVA waterproof board according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant DPA, antioxidant RD, and antioxidant BLE.

9. The high-strength EVA waterproof board according to claim 1, characterized in that: The plasticizer includes one or more of dibutyl phthalate, dioctyl phthalate, and dioctyl adipate.

10. A method for preparing a high-strength EVA waterproof board according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: weighing the component raw materials in parts by weight, mixing them evenly, blending and granulating them, melting and extruding them, and molding them to obtain a high-strength EVA waterproof board.

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