Waterproof board and preparation method thereof

Abstract

The invention relates to the technical field of plastic plates, and provides a waterproof plate and a preparation method thereof. The waterproof board is prepared from the following raw material components in parts by weight: 30 to 38 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of high-density polyethylene, 7 to 14 parts of low-density polyethylene, 8 to 14 parts of filler, 1 to 2 parts of antioxidant, 3 to 7 parts of plasticizer and 7 to 12 parts of reinforcing agent, the preparation method of the reinforcing agent comprises the following steps: S1, mixing polyester with 1-naphthoic acid to obtain pretreated polyester; and S2, mixing the pretreated polyester with polyethylene glycol, and carrying out aggregate treatment to obtain the reinforcing agent. Through the technical scheme, the problem of low breaking tensile strength of the waterproof plate in the related technology is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic boards, and in particular to a waterproof board and a preparation method thereof. Background Art

[0002] In engineering fields such as construction, transportation, and water conservancy, waterproofing boards are key materials to ensure the anti-seepage performance of structures, and their tensile strength at break is the core indicator that determines the long-term reliability of the project.

[0003] While traditional waterproofing sheets meet basic anti-seepage requirements, their tensile strength at break is increasingly exposed under complex working conditions. Due to inherent mechanical limitations, some materials are prone to localized tearing under sustained tension or sudden stress, leading to leakage. Polyester, with its high strength and high modulus, offers promising complementary performance with high-density polyethylene (HDPE). However, due to poor compatibility between the two materials, even adding polyester as a reinforcing agent to the raw material fails to effectively improve the tensile strength of waterproofing sheets.

[0004] Therefore, solving the existing problems of polyester and improving the tensile strength of waterproof boards have become key directions for solving the bottleneck of traditional material applications and meeting the needs of complex engineering environments. Summary of the Invention

[0005] The present invention provides a waterproof board and a preparation method thereof, which solves the problem of low tensile strength at break of waterproof boards in the related art.

[0006] The technical solutions of the present invention are as follows: The present invention provides a waterproof board, the raw materials of which include the following components in parts by weight: 30-38 parts of ethylene-vinyl acetate copolymer, 15-25 parts of high-density polyethylene, 7-14 parts of low-density polyethylene, 8-14 parts of filler, 1-2 parts of antioxidant, 3-7 parts of plasticizer, and 7-12 parts of reinforcing agent; The preparation method of the reinforcing agent comprises the following steps: S1, mixing polyester with 1-naphthoic acid to obtain pretreated polyester; S2. Mixing the pretreated polyester and polyethylene glycol and performing pelletization treatment to obtain the reinforcing agent.

[0007] As a further technical solution, the mass ratio of the polyester to 1-naphthoic acid is 35:5~6.

[0008] In the waterproof board of the present invention, when the mass ratio of polyester to 1-naphthoic acid is 35:5-6, the tensile strength at break of the waterproof board is further improved.

[0009] In the waterproof board of the present invention, the mass ratio of polyester to 1-naphthoic acid can be 35:5, 35:5.1, 35:5.2, 35:5.3, 35:5.4, 35:5.5, 35:5.6, 35:5.7, 35:5.8, 35:5.9, or 35:6, preferably 35:6.

[0010] As a further technical solution, the mass ratio of polyester to polyethylene glycol is 65:1~2.

[0011] As a further technical solution, in step S1, the mixing temperature is 170-180°C and the mixing time is 30-60 minutes; The temperature of the pelletizing treatment is 130-140° C., and the time is 45-60 minutes.

[0012] In the waterproof board of the present invention, when fillers are added, the fillers are dispersed in the polymer matrix. On the one hand, there is a physical interaction between the fillers and the polymer molecular chains, which limits the movement of the molecular chains and ensures the hardness and rigidity of the waterproof board. On the other hand, the presence of the fillers increases the density of the material and ensures the dimensional stability of the waterproof board.

[0013] When a plasticizer is added to the waterproof board of the present invention, the plasticizer can improve the processing performance of the raw materials, reduce the melt viscosity, make the raw materials more evenly mixed, and ensure the processing fluidity of the polymer.

[0014] When an antioxidant is added to the waterproof board of the present invention, the antioxidant can capture free radicals generated during the processing and use of the waterproof board, terminate the free radical chain reaction, avoid material aging and degradation, and maintain stable performance of the waterproof board.

[0015] As a further technical solution, after the pellet treatment, plasma treatment is also performed; The gas used for plasma treatment is a mixed gas of argon and ethylene.

[0016] In the waterproof board of the present invention, a mixed gas of argon and ethylene is used during the plasma treatment process. The use of argon increases the surface roughness of the polyester, while the use of ethylene reduces the surface polarity of the polyester. Therefore, on the one hand, the mechanical interlocking between the polyester and other materials in the system is improved, and on the other hand, the compatibility of the polyester with other materials in the system is improved. The two mechanisms work together to further improve the tensile strength at break of the waterproof board.

[0017] As a further technical solution, the volume ratio of argon to ethylene is 2:7~8.

[0018] As a further technical solution, the power of the plasma treatment is 150-160 W, and the time is 5-7 minutes.

[0019] As a further technical solution, the filler includes one or both of silicon dioxide and calcium carbonate.

[0020] In the waterproof board of the present invention, the filler can be any one or more of conventional fillers, and can be one or more of talc, kaolin, barium sulfate, wollastonite, mica powder, silica, and calcium carbonate, preferably one or two of silica and calcium carbonate.

[0021] As a further technical solution, the antioxidant includes one or both of antioxidant 1010 and antioxidant 168.

[0022] In the waterproof board of the present invention, the antioxidant can be any one or more conventional antioxidants, and can be one or more of antioxidant 3114, antioxidant 245, antioxidant 1076, antioxidant 1098, antioxidant 1010, and antioxidant 168, preferably one or two of antioxidant 1010 and antioxidant 168.

[0023] As a further technical solution, the plasticizer includes one or both of dibutyl phthalate and dioctyl phthalate.

[0024] In the waterproof board of the present invention, the plasticizer can be any one or more conventional plasticizers, and can be one or more of dioctyl sebacate, dioctyl adipate, tributyl citrate, dioctyl terephthalate, dibutyl phthalate, and dioctyl phthalate, preferably one or two of dibutyl phthalate and dioctyl phthalate.

[0025] The present invention also provides a method for preparing a waterproof board, which is used to prepare the waterproof board, comprising the following steps: The raw materials of the waterproof board are mixed evenly, extruded, and formed to obtain the waterproof board.

[0026] The working principle and beneficial effects of the present invention are: In the present invention, a reinforcing agent is prepared by mixing polyester with 1-naphthoic acid and then subjecting the mixture to a pelletizing treatment, thereby improving the tensile strength at break of a waterproof board. Different from the prior art in which polyester is directly added as a reinforcing agent, the present invention focuses on the poor compatibility of polyester in a material system. Therefore, 1-naphthoic acid is mixed with polyester for preliminary compounding, and then subjecting the mixture to a pelletizing treatment. After the 1-naphthoic acid molecules interact with the polyester through polar groups, the 1-naphthoic acid molecules increase the non-polar groups on the surface of the polyester with the non-polar groups in the molecules, thereby improving the compatibility of the polyester with other materials of the waterproof board and improving the tensile strength at break of the waterproof board. DETAILED DESCRIPTION

[0027] 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.

[0028] In the following examples and comparative examples, the model of ethylene-vinyl acetate copolymer is EV180, the model of high-density polyethylene is DMDA8008H, the model of low-density polyethylene is 2426H, the particle size of silicon dioxide is 1 μm, the particle size of calcium carbonate is 1 μm, polyester is purchased from Zhejiang Jinxia New Material Technology Co., Ltd., model DTY, thickness is 100D, length is 2 mm, and the model of polyethylene glycol is PEG-8000.

[0029] Example 1 A waterproof board, comprising the following components in parts by weight: 38 parts of ethylene-vinyl acetate copolymer, 25 parts of high-density polyethylene, 14 parts of low-density polyethylene, 14 parts of silicon dioxide, 2 parts of antioxidant 1010, 7 parts of dibutyl phthalate, and 12 parts of a reinforcing agent; The preparation method of the reinforcing agent comprises the following steps: The reinforcing agent was obtained by mixing polyester with 1-naphthoic acid at a mass ratio of 35:8 at 180°C for 30 minutes, then uniformly mixing with polyethylene glycol (the mass ratio of polyester to polyethylene glycol was 65:2), and pelletizing at 140°C for 45 minutes. The preparation method of the waterproof board comprises the following steps: The raw materials of the waterproof board are mixed evenly, extruded, and formed to obtain the waterproof board.

[0030] Example 2 A waterproof board, comprising the following components in parts by weight: 30 parts of ethylene-vinyl acetate copolymer, 15 parts of high-density polyethylene, 7 parts of low-density polyethylene, 8 parts of calcium carbonate, 1 part of antioxidant 168, 3 parts of dioctyl phthalate, and 7 parts of a reinforcing agent; The preparation method of the reinforcing agent comprises the following steps: The reinforcing agent was obtained by mixing polyester with 1-naphthoic acid at a mass ratio of 35:7 at 170°C for 60 minutes, then uniformly mixing with polyethylene glycol (the mass ratio of polyester to polyethylene glycol was 65:1), and pelletizing at 130°C for 60 minutes. The preparation method of the waterproof board comprises the following steps: The raw materials of the waterproof board are mixed evenly, extruded, and formed to obtain the waterproof board.

[0031] Example 3 The only difference between this embodiment and embodiment 2 is that the mass ratio of polyester to 1-naphthoic acid in this embodiment is 35:4.

[0032] Example 4 The only difference between this embodiment and embodiment 2 is that the mass ratio of polyester to 1-naphthoic acid in this embodiment is 35:5.

[0033] Example 5 The only difference between this embodiment and embodiment 2 is that the mass ratio of polyester to 1-naphthoic acid in this embodiment is 35:6.

[0034] Example 6 The only difference between this embodiment and embodiment 5 is that the preparation method of the reinforcing agent in this embodiment includes the following steps: Polyester with a mass ratio of 35:6 and 1-naphthoic acid were mixed at 170°C for 60 minutes, then mixed evenly with polyethylene glycol (the mass ratio of polyester to polyethylene glycol was 65:1), pelletized at 130°C for 60 minutes, and plasma treated (power 160W, time 5 minutes) to obtain a reinforcing agent; The gas used for plasma treatment is a mixed gas of argon and ethylene with a volume ratio of 1:4.

[0035] Example 7 The only difference between this embodiment and embodiment 5 is that the preparation method of the reinforcing agent in this embodiment includes the following steps: Polyester with a mass ratio of 35:6 and 1-naphthoic acid were mixed at 170°C for 60 minutes, then mixed evenly with polyethylene glycol (the mass ratio of polyester to polyethylene glycol was 65:1), pelletized at 130°C for 60 minutes, and plasma treated (power 150W, time 7 minutes) to obtain a reinforcing agent; The gas used for plasma treatment is a mixed gas of argon and ethylene with a volume ratio of 2:7.

[0036] Comparative Example 1 The only difference between this comparative example and Example 2 is that the preparation method of the reinforcing agent in this comparative example includes the following steps: Polyester and 1-naphthoic acid in a mass ratio of 35:6 were mixed at 170° C. for 60 minutes to obtain a reinforcing agent.

[0037] Comparative Example 2 The only difference between this comparative example and Example 2 is that the reinforcing agent in this comparative example is replaced with polyester of equal mass.

[0038] Comparative Example 3 The only difference between this comparative example and Example 2 is that the preparation method of the reinforcing agent in this comparative example includes the following steps: The polyester and polyethylene glycol were uniformly mixed (the mass ratio of polyester to polyethylene glycol was 65:1), and pelletized at 130° C. for 60 minutes to obtain a reinforcing agent.

[0039] Experimental Example 1 The waterproof boards prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were tested for tensile strength at break according to the method specified in Q CR 562.1-2018 "Railway Tunnel Drainage Materials Part 1: Waterproof Boards". The tensile speed was 250 mm / min. The test results are shown in Table 1.

[0040] Table 1 Test results of tensile strength at break

[0041] As shown in Table 1, the tensile strength at break of the waterproof boards prepared in Examples 1 to 5 of the present invention reached above 26.6 MPa. Therefore, the present invention improves the tensile strength at break of the waterproof boards by mixing 1-naphthoic acid with polyester and then performing a pelletizing process.

[0042] As can be seen from Table 1, the tensile strength at break of the waterproof boards prepared in Examples 6 to 7 of the present invention reached above 30.6 MPa. Therefore, the present invention uses a mixed gas of argon and ethylene for plasma treatment to further improve the tensile strength at break of the waterproof boards.

[0043] Experimental Example 2 The waterproof sheet produced in Example 7 was tested for puncture strength and elongation at break according to the methods specified in Q CR 562.1-2018, "Railway Tunnel Waterproofing and Drainage Materials - Part 1: Waterproof Sheets," and its Shore A hardness was tested according to the method specified in GB / T 2411-2008, "Plastics and Ebonite - Determination of Indentation Hardness (Shore Hardness) Using a Durometer." The test results are shown in Table 2.

[0044] Table 2 Puncture strength, elongation at break, and Shore A hardness test results

[0045] 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 waterproof board, characterized in that: The raw materials include the following components in parts by weight: 30-38 parts of ethylene-vinyl acetate copolymer, 15-25 parts of high-density polyethylene, 7-14 parts of low-density polyethylene, 8-14 parts of filler, 1-2 parts of antioxidant, 3-7 parts of plasticizer, and 7-12 parts of reinforcing agent; The preparation method of the reinforcing agent comprises the following steps: S1, mixing polyester with 1-naphthoic acid to obtain pretreated polyester; S2. Mixing the pretreated polyester and polyethylene glycol and performing pelletization treatment to obtain the reinforcing agent.

2. A waterproof board according to claim 1, characterized in that: The mass ratio of the polyester to 1-naphthoic acid is 35:5-6.

3. The waterproof board according to claim 1, characterized in that: In step S1, the mixing temperature is 170-180°C and the mixing time is 30-60 minutes; The temperature of the pelletizing treatment is 130-140° C., and the time is 45-60 minutes.

4. A waterproof board according to any one of claims 1 to 3, characterized in that: After the pellet treatment, plasma treatment is also performed; The gas used for plasma treatment is a mixed gas of argon and ethylene.

5. The waterproof board according to claim 4, characterized in that: The volume ratio of the argon gas to the ethylene gas is 2:7-8.

6. The waterproof board according to claim 4, characterized in that: The power of the plasma treatment is 150-160 W, and the time is 5-7 minutes.

7. The waterproof board according to claim 1, characterized in that: The filler includes one or both of silicon dioxide and calcium carbonate.

8. The waterproof board according to claim 1, characterized in that: The antioxidant includes one or both of antioxidant 1010 and antioxidant 168.

9. The waterproof board according to claim 1, characterized in that: The plasticizer includes one or both of dibutyl phthalate and dioctyl phthalate.

10. A method for preparing a waterproof board, for preparing a waterproof board according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials of the waterproof board are mixed evenly, extruded, and formed to obtain the waterproof board.

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