A polymer waterproof board and a preparation method thereof

Abstract

This invention belongs to the field of polymer materials technology, specifically relating to a polymer waterproofing membrane and its preparation method. The polymer waterproofing membrane comprises the following components by weight: 70-85 parts polymer base material, 10-15 parts non-asphalt-based self-adhesive, and 5-15 parts Velcro. This invention effectively overcomes the difficulties of hanging waterproofing membranes in tunnel construction, such as easy detachment. By bonding the membrane to the geotextile in the tunnel using Velcro, the waterproofing membrane is firmly suspended on the tunnel wall. Simultaneously, the resulting waterproofing membrane possesses excellent mechanical and waterproof properties, meeting the required usage.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a polymer waterproof board and its preparation method. Background Technology

[0002] Existing tunnel waterproofing membranes typically have two construction types: one is a pure sheet material, commonly known as a bare sheet. During tunnel construction, matching hot-melt gaskets need to be installed on the tunnel wall first, and then the waterproofing membrane is welded to the gaskets using a high-frequency magnetic welding machine. This process involves numerous steps, and because the tunnel wall is not perfectly flat in practice, the stress on the membrane can lead to localized weld detachment. The other type is a composite waterproofing membrane with a backing and slings. During tunnel construction, hooks need to be installed on the tunnel wall first, and then slings are used to secure the waterproofing membrane to the hooks one by one. Because the tunnel wall is not perfectly flat, hook positioning often deviates, resulting in some slings not being able to be secured, leading to unstable hanging of the waterproofing membrane.

[0003] Therefore, there is an urgent need to develop a waterproof membrane that can be securely suspended during tunnel construction. Summary of the Invention

[0004] This invention aims to provide a polymer waterproof membrane and its preparation method. This polymer waterproof membrane effectively overcomes the problems of difficulty in hanging and easy detachment of waterproof membranes during tunnel construction. It is firmly suspended on the tunnel wall by bonding it to the geotextile on the tunnel surface using Velcro.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a polymer waterproof board, comprising the following components by weight: 70-85 parts of polymer base material, 10-15 parts of non-asphalt-based self-adhesive, and 5-15 parts of Velcro.

[0006] Preferably, the polymer base material comprises the following components in parts by weight: 125-175 parts polyethylene, 25-75 parts ethylene-vinyl acetate, 3-8 parts UV stabilizer, 2-6 parts antioxidant, and 3-8 parts flame retardant.

[0007] Preferably, the polyethylene is linear low-density polyethylene (LLDPE), and the polyethylene is a mixture of DFDA-7042 and BG-22B02, wherein the mass ratio of DFDA-7042 to BG-22B02 is (13-15):(5-7).

[0008] Preferably, the non-asphalt-based self-adhesive comprises the following components in parts by weight: 35-50 parts naphthenic oil, 5-10 parts EVA hot melt adhesive, 6-12 parts SBS rubber, 3-8 parts SIS rubber, 15-25 parts tackifier, and 2-5 parts UV stabilizer.

[0009] Preferably, the UV stabilizer comprises zinc oxide and magnesium oxide, wherein the mass ratio of zinc oxide to magnesium oxide is (3-5):(5-7).

[0010] Preferably, the polymer waterproof membrane includes at least one of the following items (1)-(2):

[0011] (1) The naphthenic oil is a naphthenic oil with active hydroxyl groups;

[0012] (2) The tackifier includes at least one of terpene resin, petroleum resin, oil-soluble phenolic resin, rosin glycerol ester, rosin pentaerythritol ester, and terpene phenolic resin.

[0013] Preferably, the polymer waterproof membrane includes at least one of the following items (1)-(2):

[0014] (1) The antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010) and tris(2,4-di-tert-butylphenyl) phosphite;

[0015] (2) The flame retardant includes at least one of antimony trioxide and decabromodiphenyl ethane.

[0016] A method for preparing the aforementioned polymer waterproof membrane includes the following steps:

[0017] S1. Polyethylene, ethylene-vinyl acetate, UV stabilizer, antioxidant, and flame retardant are mixed evenly, and then melt-extruded, calendered, cooled, and shaped to produce a polymer base material.

[0018] S2. Add naphthenic oil, EVA hot melt adhesive, SBS rubber, SIS rubber, tackifier and UV stabilizer to the reactor, heat and stir to melt, and make non-asphalt-based self-adhesive.

[0019] S3. Using a polymer base material as the base layer, apply non-asphalt-based self-adhesive evenly on top, and then use a pressure roller to bond the Velcro together to form a polymer waterproof board.

[0020] Preferably, the Velcro is made of a nylon-polyester blend material with a surface covered with stiff, hooked bristles.

[0021] Preferably, the hook and loop length of the hook and loop fastener is 5-8mm, the width of the hook and loop fastener is 8-10cm, and they are horizontally distributed on the surface of the polymer base material at 50cm intervals.

[0022] Preferably, the preparation method includes at least one of the following (1)-(2):

[0023] (1) The melt extrusion temperature in step S1 is 185℃-220℃;

[0024] (2) In step S2, the temperature is raised to 185-195℃ and the stirring rate is 35-50Hz.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The polymer waterproof membrane prepared by this invention has good peel strength and bonding strength, and can be connected with pre-set geotextile hooks and mortises. The bonding is firm, the construction is simple, and the construction efficiency is far higher than that of traditional binding construction. It does not use high-frequency welding, which effectively avoids the material being damaged during construction. At the same time, the polymer waterproof membrane prepared by this invention has good flexibility, tensile strength, puncture resistance and other properties, which can meet the national standard requirements. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise specified, the experimental methods used in the examples and comparative examples are conventional methods, and the materials and reagents used are commercially available unless otherwise specified.

[0029] The raw materials used in the examples and comparative examples are shown in Table 1.

[0030] Table 1

[0031]

[0032] In the table above, the melt flow index was determined according to the GB / T3682-2018 standard.

[0033] Examples 1-9 and Comparative Examples 1-8

[0034] The components, weight parts, and performance parameters of the polymer waterproof membranes of Examples 1-9 and Comparative Examples 1-8 are shown in Tables 4 and 5.

[0035] The preparation methods of the polymer waterproof membranes in Examples 1-9 and Comparative Examples 1-8 include the following steps:

[0036] S1. Polyethylene, ethylene-vinyl acetate, UV stabilizer, antioxidant, and flame retardant are mixed evenly in a certain proportion, and then melt-extruded, calendered, cooled, and shaped to produce a polymer base material.

[0037] S2. Add naphthenic oil, EVA hot melt adhesive, SBS rubber, SIS rubber, tackifier and UV stabilizer to the reactor in proportion, heat and stir to melt, and make non-asphalt-based self-adhesive.

[0038] S3. Using a polymer base material as the base layer, apply non-asphalt-based self-adhesive evenly on top, and then use a pressure roller to bond the Velcro together to form a polymer waterproof board.

[0039] The hooks and loops of the Velcro are 6mm long and 10cm wide, and are horizontally distributed on the surface of the polymer base material at 50cm intervals.

[0040] Furthermore, the melt extrusion temperature in step S1 is 200°C;

[0041] Furthermore, in step S2, the temperature is raised to 185°C and the stirring rate is 50 Hz.

[0042] Table 2. Components of the polymer matrix (parts by weight)

[0043]

[0044] In the table above, the UV stabilizer is C1, and the mass ratio of zinc oxide to magnesium oxide is 4.2:6.4.

[0045] Table 3. Components of non-asphalt-based self-adhesives (parts by weight)

[0046]

[0047] In the table above, the UV stabilizer is C1, and the mass ratio of zinc oxide to magnesium oxide is 4.2:6.4.

[0048] Table 4 shows the amounts (parts by weight) of the components used in the examples.

[0049]

[0050] Table 5 shows the amounts (parts by weight) of components used in the comparative examples.

[0051]

[0052] Performance testing

[0053] The ultra-low loss polypropylene compositions prepared in Examples 1-9 and Comparative Examples 1-9 were subjected to relevant performance tests. The test methods and standards are shown in Table 6, and the performance test results are shown in Table 7.

[0054] Table 6 Performance Test Methods and Standards

[0055]

[0056] Table 7 Performance Test Results

[0057]

[0058] As can be seen from the data in Table 7, the polymer waterproof membrane prepared in the embodiments of the present invention has good peel strength and bonding strength. It can be bonded to the geotextile on the tunnel by Velcro and firmly hung on the tunnel wall, solving the problem of difficulty in hanging and easy fall-off of waterproof membrane in tunnel construction.

[0059] Specifically, by comparing Example 1 and Comparative Examples 2-3, it can be seen that when the amount of polyethylene in the polymer base material is within a certain range, the resulting polymer base material is relatively soft, with a small stress bending reaction force, and when the non-asphalt-based self-adhesive is peeled from the polymer base material, the reaction force is small, thus enabling the polymer waterproof board prepared by the present invention to have better peel strength and bonding strength.

[0060] By comparing Examples 1, 6-7 and Comparative Examples 1, 5, it can be seen that only when the two components of polyethylene, DFDA-7042 and BG-22B02, in the polymer base material are within a certain mass ratio range, the resulting polymer base material is relatively soft, with a small stress bending reaction force, and the reaction force is small when the non-asphalt-based self-adhesive is peeled from the polymer base material. Only then can the polymer waterproof board prepared by the present invention have good peel strength and bonding strength.

[0061] By comparing Example 1 and Comparative Example 4, it can be seen that when ethylene-vinyl acetate is missing in the polymer matrix, the resulting polymer matrix is ​​relatively rigid, and its stress bending reaction force is large. When the non-asphalt-based self-adhesive is peeled from the polymer matrix, the reaction force is large, which is not conducive to the polymer waterproof board prepared by the present invention having good peel strength and bonding strength.

[0062] By comparing Example 1 and Comparative Example 6, it can be seen that only when naphthenic oil with active hydroxyl groups is used in the non-asphalt-based self-adhesive can the non-asphalt-based self-adhesive have higher tack and higher adhesion to the polymer base material, so that the polymer waterproof board prepared by the present invention can have better peel strength and bonding strength.

[0063] By comparing Example 1 and Comparative Examples 7 and 9, it can be seen that only when the mass ratio of SBS rubber and SIS rubber in the non-asphalt-based self-adhesive is within a certain range can the adhesive force and cohesive force of the non-asphalt-based self-adhesive be achieved to a certain extent, so that the polymer waterproof board prepared by the present invention can have better peel strength and adhesive strength.

[0064] By comparing Example 1 and Comparative Example 8, it can be seen that the non-asphalt-based self-adhesive lacks EVA hot melt adhesive, resulting in a softer non-asphalt-based self-adhesive with lower cohesion, which is not conducive to the polymer waterproof board obtained by the present invention having better peel strength and bonding strength.

[0065] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A polymer waterproof membrane, characterized in that, The product comprises the following components by weight: 70-85 parts of polymer base material, 10-15 parts of non-asphalt self-adhesive, and 5-15 parts of hook and loop fastener. The polymer waterproof membrane is made by using polymer base material as the bottom layer, uniformly applying non-asphalt self-adhesive on top, and then bonding hook and loop fastener together with a pressure roller. The polymer base material comprises the following components by weight: 125-175 parts polyethylene, 25-75 parts ethylene-vinyl acetate, 3-8 parts UV stabilizer, 2-6 parts antioxidant, and 3-8 parts flame retardant; the polyethylene is linear low-density polyethylene, and the polyethylene is a mixture of DFDA-7042 and BG-22B02, wherein the mass ratio of DFDA-7042 to BG-22B02 is (13-15):(5-7); The non-asphalt-based self-adhesive comprises the following components by weight: 35-50 parts naphthenic oil, 5-10 parts EVA hot melt adhesive, 6-12 parts SBS rubber, 3-8 parts SIS rubber, 15-25 parts tackifier, and 2-5 parts UV stabilizer. The cycloalkane oil is a cycloalkane oil with active hydroxyl groups.

2. The polymer waterproof sheet according to claim 1, wherein The UV stabilizer comprises zinc oxide and magnesium oxide, wherein the mass ratio of zinc oxide to magnesium oxide is (3-5):(5-7).

3. The polymer waterproof membrane as described in claim 1, characterized in that, The tackifier includes at least one of terpene resin, petroleum resin, oil-soluble phenolic resin, rosin glycerol ester, rosin pentaerythritol ester, and terpene phenolic resin.

4. The polymer waterproof sheet according to claim 1, wherein It must include at least one of the following (1)-(2): (1) The antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris(2,4-di-tert-butylphenyl) phosphite; (2) The flame retardant includes at least one of antimony trioxide and decabromodiphenyl ethane.

5. A method of producing the polymer waterproof sheet according to any one of claims 1 to 4, characterized by, Includes the following steps: S1. Polyethylene, ethylene-vinyl acetate, UV stabilizer, antioxidant, and flame retardant are mixed evenly, and then melt-extruded, calendered, cooled, and shaped to produce a polymer base material. S2. Add naphthenic oil, EVA hot melt adhesive, SBS rubber, SIS rubber, tackifier and UV stabilizer to the reactor, heat and stir to melt, and make non-asphalt-based self-adhesive. S3. Using a polymer base material as the base layer, apply non-asphalt-based self-adhesive evenly on top, and then use a pressure roller to bond the Velcro together to form a polymer waterproof board.

6. The preparation method according to claim 5, characterized in that, The hook and loop fasteners have a hook and loop length of 5-8mm and a width of 8-10cm, and are horizontally distributed on the surface of the polymer base material at 50cm intervals.

7. The preparation method according to claim 5, characterized in that, The melt extrusion temperature in step S1 is 185℃-220℃.

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