A waterproof board and a method for manufacturing the same

Abstract

The application relates to the technical field of plastic plates, and discloses a waterproof plate and a preparation method thereof. The waterproof plate is prepared from 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 and 1-naphthalenecarboxylic acid to obtain pretreated polyester; and S2, mixing the pretreated polyester with polyethylene glycol and carrying out pelletizing treatment to obtain the reinforcing agent. Through the technical scheme, the problem of low tensile strength at break of the waterproof plate in the related art 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:

[0007] 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;

[0008] The preparation method of the reinforcing agent comprises the following steps:

[0009] S1, mixing polyester with 1-naphthoic acid to obtain pretreated polyester;

[0010] S2. Mixing the pretreated polyester and polyethylene glycol and performing pelletization treatment to obtain the reinforcing agent.

[0011] As a further technical solution, the mass ratio of the polyester to 1-naphthoic acid is 35:5~6.

[0012] 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.

[0013] The mass ratio of the polyester and 1-naphthoic acid in the waterproof board 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, 35:6, and preferably 35:6.

[0014] As a further technical solution, the mass ratio of the polyester and polyethylene glycol is 65:1-2.

[0015] As a further technical solution, in step S1, the temperature of the mixing is 170-180 DEG C, and the time is 30-60 min.

[0016] The temperature of the pellet treatment is 130-140 DEG C, and the time is 45-60 min.

[0017] In the waterproof board, when the filler is added, the filler is dispersed in the polymer matrix, on the one hand, there is a physical interaction between the filler and the polymer molecular chain, which limits the movement of the molecular chain, ensures the hardness and rigidity of the waterproof board, and on the other hand, the presence of the filler increases the density of the material, which ensures the dimensional stability of the waterproof board.

[0018] In the waterproof board, when the plasticizer is added, the plasticizer can improve the processing performance of the raw material, reduce the melt viscosity, make the raw material mixing more uniform, and ensure the processing flowability of the polymer.

[0019] In the waterproof board, when the antioxidant is added, the antioxidant can capture the 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 the performance stability of the waterproof board.

[0020] As a further technical solution, after the pellet treatment, plasma treatment is further carried out.

[0021] The gas for the plasma treatment is a mixed gas of argon and ethylene.

[0022] In the waterproof board, during the plasma treatment, a mixed gas of argon and ethylene is used, the use of argon improves the roughness of the polyester surface, and the use of ethylene reduces the surface polarity of the polyester, thus 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 between the polyester and other materials in the system is improved, and the two mechanisms synergistically further improve the tensile strength at break of the waterproof board.

[0023] As a further technical solution, the volume ratio of the argon and ethylene is 2:7-8.

[0024] As a further technical solution, the power of the plasma treatment is 150-160 W, and the time is 5-7 min.

[0025] As a further technical solution, the filler includes one or both of silica and calcium carbonate.

[0026] In the waterproof board, the filler can be any one or more of the conventional fillers, can be one or more of talc, kaolin, barium sulfate, wollastonite, mica powder, silica, calcium carbonate, preferably one or both of silica and calcium carbonate.

[0027] As a further technical solution, the antioxidant includes one or both of antioxidant 1010 and antioxidant 168.

[0028] In the waterproof board, the antioxidant can be any one or more of the conventional antioxidants, can be one or more of antioxidant 3114, antioxidant 245, antioxidant 1076, antioxidant 1098, antioxidant 1010, antioxidant 168, preferably one or both of antioxidant 1010 and antioxidant 168.

[0029] As a further technical solution, the plasticizer includes one or both of dibutyl phthalate and dioctyl phthalate.

[0030] In the waterproof board, the plasticizer can be any one or more of the conventional plasticizers, can be one or more of dioctyl sebacate, dioctyl adipate, tributyl citrate, dioctyl terephthalate, dibutyl phthalate, dioctyl phthalate, preferably one or both of dibutyl phthalate and dioctyl phthalate.

[0031] The application also provides a preparation method of the waterproof board, for preparing the waterproof board, comprising the following steps:

[0032] Mixing the raw materials of the waterproof board uniformly, extruding, molding, to obtain the waterproof board.

[0033] The working principle and beneficial effects of the application are as follows:

[0034] In the application, the reinforcing agent is prepared by mixing polyester and 1-naphthoic acid and then performing pelletizing treatment, thereby improving the tensile strength at break of the waterproof board. Unlike the case of directly adding polyester as a reinforcing agent in the prior art, the application focuses on the poor compatibility of polyester in the material system. Therefore, 1-naphthoic acid is used to mix with polyester for preliminary compounding, and then pelletizing treatment is performed. After the interaction of 1-naphthoic acid molecules with polyester through polar groups, the non-polar groups on the surface of polyester are increased due to the non-polar groups in the 1-naphthoic acid molecules, thereby improving the compatibility of polyester with other materials of the waterproof board and improving the tensile strength at break of the waterproof board. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work, are within the scope of protection of the present application.

[0036] In the following examples and comparative examples, the type of ethylene-vinyl acetate copolymer is EV180, the type of high-density polyethylene is DMDA8008H, the type of low-density polyethylene is 2426H, the particle size of silicon dioxide is 1 μm, the particle size of calcium carbonate is 1 μm, the polyester is purchased from Zhejiang Jinxia New Material Technology Co., Ltd., the type is DTY, the fineness is 100D, and the length is 2 mm, and the type of polyethylene glycol is PEG-8000.

[0037] Example 1

[0038] A waterproof board, the raw materials comprising the following components in parts by weight: ethylene-vinyl acetate copolymer 38 parts, high-density polyethylene 25 parts, low-density polyethylene 14 parts, silicon dioxide 14 parts, antioxidant 1010 2 parts, dibutyl phthalate 7 parts, reinforcing agent 12 parts;

[0039] The preparation method of the reinforcing agent comprises the following steps:

[0040] The polyester and 1-naphthoic acid are mixed at a mass ratio of 35:8 at 180°C for 30 min, and then the polyethylene glycol is uniformly mixed (the mass ratio of the polyester to the polyethylene glycol is 65:2), and the granulation treatment is performed at 140°C for 45 min to obtain the reinforcing agent;

[0041] The preparation method of the waterproof board comprises the following steps:

[0042] The raw materials of the waterproof board are uniformly mixed, extruded, and molded to obtain the waterproof board.

[0043] Example 2

[0044] A waterproof board, the raw materials comprising the following components in parts by weight: ethylene-vinyl acetate copolymer 30 parts, high-density polyethylene 15 parts, low-density polyethylene 7 parts, calcium carbonate 8 parts, antioxidant 168 1 part, dioctyl phthalate 3 parts, reinforcing agent 7 parts;

[0045] The preparation method of the reinforcing agent comprises the following steps:

[0046] The polyester and 1-naphthoic acid are mixed at a mass ratio of 35:7 at 170°C for 60 min, and then the polyethylene glycol is uniformly mixed (the mass ratio of the polyester to the polyethylene glycol is 65:1), and the granulation treatment is performed at 130°C for 60 min to obtain the reinforcing agent;

[0047] The preparation method of the waterproof plate comprises the following steps:

[0048] The raw materials of the waterproof plate are uniformly mixed, extruded, and formed to obtain the waterproof plate.

[0049] Example 3

[0050] The difference between this example and Example 2 is that the mass ratio of polyester to 1-naphthoic acid in this example is 35:4.

[0051] Example 4

[0052] The difference between this example and Example 2 is that the mass ratio of polyester to 1-naphthoic acid in this example is 35:5.

[0053] Example 5

[0054] The difference between this example and Example 2 is that the mass ratio of polyester to 1-naphthoic acid in this example is 35:6.

[0055] Example 6

[0056] The difference between this example and Example 5 is that the preparation method of the reinforcing agent in this example comprises the following steps:

[0057] Polyester and 1-naphthoic acid with a mass ratio of 35:6 are mixed at 170℃ for 60min, then uniformly mixed with polyethylene glycol (the mass ratio of polyester to polyethylene glycol is 65:1), pelletized at 130℃ for 60min, and subjected to plasma treatment (power is 160W, time is 5min) to obtain the reinforcing agent;

[0058] The gas for plasma treatment is a mixed gas of argon and ethylene with a volume ratio of 1:4.

[0059] Example 7

[0060] The difference between this example and Example 5 is that the preparation method of the reinforcing agent in this example comprises the following steps:

[0061] Polyester and 1-naphthoic acid with a mass ratio of 35:6 are mixed at 170℃ for 60min, then uniformly mixed with polyethylene glycol (the mass ratio of polyester to polyethylene glycol is 65:1), pelletized at 130℃ for 60min, and subjected to plasma treatment (power is 150W, time is 7min) to obtain the reinforcing agent;

[0062] The gas for plasma treatment is a mixed gas of argon and ethylene with a volume ratio of 2:7.

[0063] Comparative Example 1

[0064] 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:

[0065] 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.

[0066] Comparative Example 2

[0067] 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.

[0068] Comparative Example 3

[0069] 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:

[0070] 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.

[0071] Experimental Example 1

[0072] 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.

[0073] Table 1 Test results of tensile strength at break

[0074]

[0075] 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.

[0076] 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.

[0077] Experimental Example 2

[0078] 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.

[0079] Table 2 Puncture strength, elongation at break, Shore A test results

[0080]

[0081] The above merely provides the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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 with polyethylene glycol and performing pelletizing treatment to obtain the reinforcing agent; The mass ratio of the polyester to 1-naphthoic acid is 35:5-6; 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.

2. A waterproof board according to claim 1, 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.

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

4. A waterproof board according to claim 2, characterized in that: The power of the plasma treatment is 150-160 W, and the time is 5-7 minutes.

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

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

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

8. A method for preparing a waterproof board, for preparing a waterproof board according to any one of claims 1 to 7, 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.

Images