Wave-shaped waterproof board produced by using waste rigid polyvinyl chloride as raw material

Abstract

The present invention relates to the field of building materials, and in particular to a wave-shaped waterproof board produced by using waste rigid polyvinyl chloride as a raw material. The raw material comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 6-15 parts of ethylene-propylene rubber, 3-10 parts of polycarbonate, 10-18 parts of a filler, and 3-6 parts of a stabilizer. The waterproof board of the present invention can improve the low temperature resistance while ensuring the existing performance such as longitudinal tension and bearing capacity.

Description

A corrugated waterproof board produced with waste rigid polyvinyl chloride as raw material Technical Field

[0001] The invention relates to the field of building materials, in particular to a corrugated waterproof board produced by taking waste rigid polyvinyl chloride as raw material. Background Art

[0002] Corrugated asphalt waterproofing sheets, popular in the market in recent years, are made of fiber-reinforced asphalt. As a permanent underlay for hard pitched roofs, they offer dry-work, ventilation, dehumidification, insulation, simplified roofing layers, and are suitable for construction sites in all weather conditions. They are also resistant to trampling and external forces. They can be paired with various synthetic resin tiles, clay tiles, cement tiles, slate tiles, metal tiles, and corrugated three-dimensional asphalt tiles to create a three-dimensional waterproof and drainage-resistant system for pitched roofs. However, due to the base asphalt, traditional fiber-reinforced corrugated asphalt waterproofing sheets have limitations in longitudinal tensile strength, high-temperature flow resistance, low-temperature brittleness, and combustion resistance, as well as high production costs.

[0003] Polyvinyl chloride (PVC) is a polymer formed by the free radical polymerization of vinyl chloride monomer (VCM) in the presence of initiators such as peroxides and azo compounds, or under the influence of light or heat. Vinyl chloride homopolymers and copolymers are collectively referred to as vinyl chloride resins. PVC exhibits excellent chemical properties such as flame retardancy, insulation, and abrasion resistance, making it widely used in building materials, light industry, agriculture, and other fields. PVC products can be categorized into hard and soft products based on their main properties. Hard products are primarily used in construction materials such as pipes and profiles, while soft products are primarily used in films, cables, and artificial leather.

[0004] Therefore, PVC is also applied to the corrugated waterproof board to improve the comprehensive performance of the corrugated waterproof board.

[0005] For example, the applicant's previously submitted patent application 2020108384486, a preparation and application of a corrugated unplasticized polyvinyl chloride modified waterproof board, is composed of 60-70 parts of PVC, 8-13 parts of chlorinated polyethylene, 20-30 parts of calcium carbonate, 3-5 parts of stabilizer, and 1-2 parts of processing aid. This combination of formulas, combined with process adjustments, produces a waterproof board with a longitudinal tensile force of no less than 800N, flexibility: 10°C, bending around a radius of 35mm, no surface cracks, heat resistance: 100°C, 2h, no flow, and a load-bearing capacity of 700 / m 2 Load, deflection should not exceed 3.1mm, combustion performance: not less than B1 level.

[0006] However, the above-mentioned waterproof board still has some defects in actual use, especially low-temperature brittleness, and its low-temperature resistance needs to be improved, especially in the north where the temperature is low in winter and it is under the heavy pressure of snow for a long time, which makes the waterproof board easy to crack or even break. Summary of the Invention

[0007] The purpose of the present invention is to solve the above-mentioned technical problems existing in the existing corrugated waterproof board with PVC as the main raw material, and to provide a corrugated waterproof board produced with waste rigid polyvinyl chloride as raw material, which can improve the low-temperature resistance while ensuring the existing longitudinal tension, bearing capacity and other performance.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0010] 100 parts of polyvinyl chloride, 6-15 parts of EPDM rubber, 3-10 parts of polycarbonate, 10-18 parts of filler, and 3-6 parts of stabilizer.

[0011] The present invention addresses the problem of poor low-temperature performance and insufficient load-bearing capacity of waterproof boards during actual use. The present invention improves the components of corrugated waterproof boards. While using polyvinyl chloride as the main raw material, EPDM rubber and polycarbonate are introduced, and suitable fillers and stabilizers are used. The resulting waterproof board has longitudinal tension, flexibility, heat resistance, deflection, and combustion performance that at least reach the same level as existing waterproof boards. The board also reduces brittleness at low temperatures, and its low-temperature impact strength at -30°C can reach 50 kJ / m 2 , the brittle temperature can be obtained at minus 40℃ or below.

[0012] Polyvinyl chloride is the main raw material for waterproof boards after asphalt waterproof boards, such as 2020108384486 mentioned in the background technology. Using polyvinyl chloride as the main raw material for waterproof boards can obtain corrugated waterproof boards with relatively good bearing capacity, longitudinal tension, flexibility, heat resistance, deflection, and combustion performance.

[0013] However, the existing technology does not consider the performance of corrugated waterproof boards in low temperature and overload environments. After testing, the existing waterproof boards are prone to low-temperature brittle cracking in low-temperature environments, and their load-bearing performance is insufficient at low temperatures, making it difficult to meet the low-temperature and high-load usage conditions in certain situations.

[0014] Preferably, the polyvinyl chloride is waste rigid polyvinyl chloride.

[0015] In this proposal, the applicant, in order to fully utilize waste PVC resources, is exploring the use of waste rigid PVC in the production of waterproofing sheets. This approach not only reduces environmental pollution caused by waste rigid PVC but also allows for resource reuse. However, waste rigid PVC may suffer wear, aging, or damage from prolonged use or exposure to the environment, leading to a decrease in its physical properties. It may also be affected by chemical substances, causing changes in its chemical properties. Therefore, using waste rigid PVC as the primary raw material for corrugated waterproofing sheets can reduce the low-temperature performance of the sheets, including low-temperature impact strength and brittle temperature.

[0016] Therefore, in this solution, preferably, 3-8 parts by weight of styrene-butadiene rubber is added to the components of the corrugated waterproof board. The addition of styrene-butadiene rubber can optimize the performance of waste rigid polyvinyl chloride as the main raw material. After adding styrene-butadiene rubber, the low-temperature impact strength at -30°C can reach 65KJ / m 2 , the brittle temperature can be obtained at minus 49°C or below.

[0017] Preferably, the filler is a mixture of mica and calcium carbonate.

[0018] Preferably, the mica and calcium carbonate are mixed in a weight ratio of 1:3.

[0019] Preferably, the stabilizer is one or more of zinc stearate, magnesium stearate, and calcium stearate.

[0020] On the other hand, the present invention also improves the structure of the corrugated waterproof board to achieve better supporting performance at low temperatures, and provides a corrugated waterproof board, including a crest area, a trough area and a connecting area. The connecting area connects the crest area and the trough area, a thickened portion is provided in the connecting area, and a flat area is provided at the bottom of the trough area.

[0021] Preferably, the length of the thickened portion is the middle of the length of the connecting area.

[0022] Preferably, the length of the thickened portion is at least half of the length of the connecting region.

[0023] The present invention also provides a method for preparing the above-mentioned corrugated waterproof board, comprising the following steps:

[0024] S1. The raw materials were mixed in parts by weight, added to a blender, the temperature was raised to 115 to 125°C, and stirred at 400 to 450 rpm to obtain a mixture;

[0025] S2 S1 obtained mixture was transferred to a low-speed mixer, rubber oil was added, 120-180 rpm stirring to obtain an extrudate;

[0026] S3 S2 obtained by extrusion material was transferred to a twin-screw extruder, extruded to obtain a parison; twin-screw extruder barrel zone plasticizing temperature of 180 ℃ ~ 200 ℃;

[0027] S4. The parison is corrugated by a corrugated forming traction block whose linear speed is synchronized with the dual rollers, and then cooled to form the corrugated waterproofing board. Sawing to set lengths involves sawing the continuously formed corrugated waterproofing board product to the desired length.

[0028] The dimensions of the corrugated waterproof board are usually 20mm-25mm in wave height, 40mm-80mm in wave distance, and 2.5-3mm in wall thickness. Large or small wave waterproof boards can be produced according to customer needs.

[0029] The corrugated waterproof board obtained by using the raw materials of the above-mentioned corrugated waterproof board in combination with the above-mentioned preparation method has the following properties:

[0030] The low-temperature impact strength at -30°C can reach 35KJ / m 2 The brittle temperature can be below -40°C, which has better low-temperature performance and load-bearing performance at low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of a first corrugated waterproof board manufactured according to an embodiment of the present invention;

[0032] FIG2 is a schematic diagram of a second corrugated waterproof board manufactured according to an embodiment of the present invention.

[0033] In the figure, 100 is the peak area, 200 is the trough area, 300 is the connection area, 301 is the thickened part, and 201 is the flat area. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0035] Example 1

[0036] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0037] 100 parts of waste rigid polyvinyl chloride, 10 parts of EPDM rubber, 6 parts of polycarbonate, 15 parts of filler, and 5 parts of stabilizer.

[0038] Waste rigid polyvinyl chloride can be but not limited to the following:

[0039] Product cutting waste: cutting waste generated during the production process of pipes, plates, profiles, etc.

[0040] Building demolition waste: waste PVC products generated during the demolition of buildings, such as window frames, doors, and wall panels.

[0041] Plastic packaging waste: PVC packaging materials such as plastic bags, plastic bottles, etc.

[0042] Electronic and electrical waste: insulation layers and casings of electronic and electrical products, such as wires and cables, plugs and sockets, and television casings.

[0043] Automobile waste: such as automobile interior parts, seat covers, etc.

[0044] Recycled waste PVC products need to be sorted, cleaned, crushed and processed to remove pollutants and impurities before being recycled.

[0045] The filler is calcium carbonate and the stabilizer is calcium stearate.

[0046] Example 2

[0047] The difference from Example 1 is that the filler is a composition of calcium carbonate and mica in a weight ratio of 1:3.

[0048] Example 3

[0049] The difference from Example 2 is that the filler is a composition of calcium carbonate and mica in a weight ratio of 1:2.

[0050] Example 4

[0051] The difference from Example 2 is that the filler is a composition of calcium carbonate and mica in a weight ratio of 1:1.

[0052] Example 5

[0053] The difference from Example 2 is that 3 parts by weight of styrene-butadiene rubber is added to the raw materials, and the filler is a composition of calcium carbonate and mica in a weight ratio of 1:3.

[0054] Example 6

[0055] The difference from Example 5 is that the added weight portions of each component are different. This example is as follows:

[0056] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0057] 100 parts of waste rigid polyvinyl chloride, 10 parts of EPDM rubber, 6 parts of polycarbonate, 15 parts of filler, 5 parts of stabilizer, and 4 parts of styrene-butadiene rubber.

[0058] Example 7

[0059] The difference from Example 5 is that the added weight portions of each component are different. This example is as follows:

[0060] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0061] 100 parts of waste rigid polyvinyl chloride, 12 parts of EPDM rubber, 10 parts of polycarbonate, 10 parts of filler, 3 parts of stabilizer, and 6 parts of styrene-butadiene rubber.

[0062] Example 8

[0063] The difference from Example 5 is that the added weight portions of each component are different. This example is as follows:

[0064] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0065] 100 parts of waste rigid polyvinyl chloride, 8 parts of EPDM rubber, 3 parts of polycarbonate, 18 parts of filler, 6 parts of stabilizer, and 5 parts of styrene-butadiene rubber.

[0066] Example 9

[0067] The difference from Example 5 is that the added weight portions of each component are different. This example is as follows:

[0068] A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, the raw material comprising the following components in parts by weight:

[0069] 100 parts of waste rigid polyvinyl chloride, 8 parts of EPDM rubber, 5 parts of polycarbonate, 12 parts of filler, 4 parts of stabilizer, and 8 parts of styrene-butadiene rubber.

[0070] Comparative Example 1

[0071] The difference from Example 1 is that the raw material composition is different. This comparative example is as follows:

[0072] PVC 70 parts, chlorinated polyethylene 8 parts, calcium carbonate 20 parts, complex calcium zinc 5 parts; acrylic resin 2 parts.

[0073] Comparative Example 2

[0074] The difference from Example 1 is that the raw material composition is different. This comparative example is as follows:

[0075] 100 parts of waste rigid polyvinyl chloride, 10 parts of EPDM rubber, 15 parts of filler, and 5 parts of stabilizer.

[0076] In this comparative example, no polycarbonate was added.

[0077] Comparative Example 3

[0078] The difference from Example 1 is that the raw material composition is different. This comparative example is as follows:

[0079] 100 parts of waste rigid polyvinyl chloride, 6 parts of polycarbonate, 15 parts of filler, and 5 parts of stabilizer.

[0080] In this comparative example, no EPDM rubber was added.

[0081] Comparative Example 4

[0082] The difference from Example 5 is that the raw material composition is different. This comparative example is as follows:

[0083] 100 parts of waste rigid polyvinyl chloride, 10 parts of EPDM rubber, 6 parts of polycarbonate, 15 parts of filler, 5 parts of stabilizer, and 3 parts of styrene-butadiene rubber.

[0084] In this comparative example, the EPDM rubber in Example 5 was replaced by EPDM rubber.

[0085] Comparative Example 5

[0086] This comparative example differs from Example 5 in the raw material composition: 100 parts waste rigid polyvinyl chloride, 10 parts EPDM rubber, 6 parts polycarbonate, 15 parts filler, 5 parts stabilizer, and 3 parts nitrile rubber. The filler is a composition of calcium carbonate and mica in a weight ratio of 1:3. The stabilizer is calcium stearate. In this comparative example, the styrene-butadiene rubber in Example 5 is replaced with nitrile rubber.

[0087] Comparative Example 6

[0088] This comparative example differs from Example 5 in the raw material composition: 100 parts waste rigid polyvinyl chloride, 10 parts EPDM rubber, 6 parts polycarbonate, 15 parts filler, 5 parts stabilizer, and 3 parts butyl rubber. The filler is a composition of calcium carbonate and mica in a weight ratio of 1:3. The stabilizer is calcium stearate. In this comparative example, the styrene-butadiene rubber in Example 5 is replaced with butyl rubber.

[0089] Comparative Example 7

[0090] The difference from Example 1 is that the ratio of the raw materials is different. This comparative example is as follows:

[0091] 100 parts of waste rigid polyvinyl chloride, 20 parts of EPDM rubber, 6 parts of polycarbonate, 15 parts of filler, and 5 parts of stabilizer.

[0092] Comparative Example 8

[0093] The difference from Example 1 is that the ratio of the raw materials is different. This comparative example is as follows:

[0094] 100 parts of waste rigid polyvinyl chloride, 10 parts of EPDM rubber, 15 parts of polycarbonate, 15 parts of filler, and 5 parts of stabilizer.

[0095] Comparative Example 9

[0096] The difference from Example 1 is that the ratio of the raw materials is different. This comparative example is as follows:

[0097] 100 parts of waste rigid polyvinyl chloride, 5 parts of EPDM rubber, 2 parts of polycarbonate, 15 parts of filler, and 5 parts of stabilizer.

[0098] Example 10

[0099] A method for preparing a corrugated waterproof board comprises the following steps:

[0100] S1. The raw materials were mixed in parts by weight, added to a blender, the temperature was raised to 120°C, stirred at a speed of 450 rpm to obtain a mixture;

[0101] S2 S1 obtained mixture was transferred to a low-speed mixer, rubber oil was added, stirred at a speed of 150 rpm to obtain an extrudate;

[0102] S3. The extrudate obtained in S2 was transferred to a twin-screw extruder to obtain a parison; the plasticizing temperature of the twin-screw extruder barrel zone was 200 ° C;

[0103] S4. The parison is corrugated by a corrugated forming traction block whose linear speed is synchronized with the dual rollers, and then cooled to form the corrugated waterproofing board. Sawing to set lengths involves sawing the continuously formed corrugated waterproofing board product to the desired length.

[0104] By designing the extrusion head of the extruder, three corrugated waterproof boards with different structures are obtained.

[0105] The first type of corrugated waterproof board obtained, see Figure 1, includes a crest area 100, a trough area 200 and a connecting area 300. The connecting area connects the crest area and the trough area. It has a conventional corrugated structure with dimensions of 25mm in wave height, 50mm in wave distance and 2.5mm in wall thickness.

[0106] The resulting second corrugated waterproofing sheet, as shown in Figure 2, includes a crest region 100, a trough region 200, and a connecting region 300. The connecting region connects the crest and trough regions and has a thickened portion 301. A flat region 201 is located at the bottom of the trough region. The thickened portion is half the length of the connecting region. Dimensions include a wave height of 25 mm, a wave pitch of 50 mm, a wall thickness of 2.5 mm, a thickened portion wall thickness of 3.5 mm, and a flat region width of 5 mm.

[0107] Examples 1-9 and Comparative Examples 1-9 used the preparation method of Example 10 to prepare two types of corrugated waterproofing sheets, respectively. The properties of the resulting corrugated waterproofing sheets were tested, and the test items and test results are shown in Table 1 (first corrugated waterproofing sheet) and Table 2 (second corrugated waterproofing sheet).

[0108] The test method is as follows:

[0109] Longitudinal tension (N): GB / T2843-2008 standard.

[0110] Low temperature impact strength (KJ / m 2 ): GB / T2843-2008 standard.

[0111] Brittle temperature / ℃: GBT5470-2008 standard.

[0112] Table 1 Performance test results of the first corrugated waterproof board obtained in each embodiment and comparative example

[0113]

[0114] From Table 1, it can be seen that the longitudinal tensile strength, low-temperature impact strength and brittle temperature of the corrugated waterproofing sheets obtained in each embodiment of the present invention are superior to those of the comparative examples. Specifically, Examples 1 to 4 are the basic solutions of the present invention, using waste rigid polyvinyl chloride as the main raw material, and the longitudinal tensile strength reaches 870N or above, and the low-temperature impact strength at -30℃ reaches 36KJ / m 2 As shown above, the brittle temperature reaches below -40°C. Among them, Example 2 and Example 3 optimize the composition of the filler. Although the longitudinal tension does not change significantly compared with Example 1, they have better low-temperature performance. It can be seen that the filler has an impact on the low-temperature performance of the corrugated waterproof board.

[0115] Example 5 is an optimized solution using waste rigid polyvinyl chloride as the main raw material, which overcomes the shortcomings brought by waste rigid polyvinyl chloride as the main raw material. Compared with the basic solution of Example 2, the longitudinal tensile force, low-temperature impact strength and brittle temperature of the corrugated waterproof board are significantly improved.

[0116] Examples 6 to 9 are based on Example 5, but the added weight of each component is adjusted, and all of them can achieve the same performance as Example 5.

[0117] By comparing the comparative examples, it can be seen that the various features of the present invention affect each other. The solution of the present invention is a whole. Changing any one of them will affect the product performance. Specifically:

[0118] Comparative Example 1 does not use the solution of the present invention. Instead, acrylic resin is added to the components with PVC as the main raw material. The performance of the waterproof board obtained is comparable in longitudinal tensile strength, but the low-temperature performance reflected by low-temperature impact strength and brittle temperature is significantly reduced. The low-temperature impact strength is only 19.8KJ / m 2 , the brittle temperature reaches minus 14°C.

[0119] In Comparative Example 2, no polycarbonate was added, and in Comparative Example 3, no EPDM rubber was added. The results showed that the longitudinal tensile force decreased to a certain extent, and the low-temperature performance decreased more significantly, with the low-temperature impact strength being only 16.9 KJ / m 2 and 19.8KJ / m 2 , and the brittle temperatures reach -21°C and -18°C respectively. It can be seen that both polycarbonate and EPDM rubber are indispensable in the present invention.

[0120] Comparative Examples 4, 5, and 6 are experiments conducted with other alternative substances during the study of polycarbonate and EPDM rubber. The results ultimately show that polycarbonate and EPDM rubber, when added as additives to a formulation with waste rigid polyvinyl chloride as the main raw material, have the best low-temperature performance. A large number of substances were selected in the experiment, and several relatively close ones were selected for comparison in this description. Comparative Example 4 replaces EPDM rubber with EPDM rubber. The results show that the longitudinal tensile force is comparable to that of Example 1, but the low-temperature performance (low-temperature impact strength and brittle temperature) is significantly reduced. Comparative Example 5 replaces styrene-butadiene rubber with nitrile rubber, and Comparative Example 6 replaces styrene-butadiene rubber with butyl rubber. The results show that both the longitudinal tensile force and the low-temperature performance (low-temperature impact strength and brittle temperature) are significantly reduced.

[0121] The flammability rating of the corrugated waterproof boards was also tested according to the GB8624-2012 standard. The results showed that the corrugated waterproof boards obtained in Examples 1-9 all reached Class B1.

[0122] The present invention also combines the formula composition of the corrugated waterproof board to improve the structure of the waterproof board. The relevant performances of the first corrugated waterproof board and the second corrugated waterproof board as mentioned above are tested, and the test results are shown in Table 2. The results show that the longitudinal tensile force of the second corrugated waterproof board is better than the longitudinal tensile force corresponding to the first corrugated waterproof board shown in Table 1, and the low-temperature impact strength is also significantly better than the low-temperature impact strength corresponding to the first corrugated waterproof board shown in Table 1, while the brittle temperature is consistent with the first corrugated waterproof board. It can be seen that the structure of the corrugated waterproof board will also affect the mechanical properties of the waterproof board. The brittle temperature is related to the material forming the waterproof board and has nothing to do with the structural relationship. The longitudinal tensile force and low-temperature impact strength are affected by the structure of the waterproof board. The second type of waterproof board with a special structure adopted by the present invention has better longitudinal tensile force and low-temperature impact strength, and is more suitable for use as a waterproof board in low-temperature environments, especially suitable for use as a waterproof board in low-temperature and snowy weather in the north.

[0123] Table 2 Performance test results of the second corrugated waterproof board obtained in each embodiment

[0124] .

Claims

1. A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material, characterized in that: The raw materials include the following components in parts by weight: 100 parts of waste rigid polyvinyl chloride, 6-15 parts of ethylene propylene rubber, 3-10 parts of polycarbonate, 10-18 parts of filler and 3-6 parts of stabilizer.

2. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1, characterized in that: The components of the corrugated waterproof board also include 3-8 parts by weight of styrene-butadiene rubber.

3. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1 or 2, characterized in that: The filler is a mixture of mica and calcium carbonate.

4. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 3, characterized in that: The mica and calcium carbonate are mixed in a weight ratio of 1:

3.

5. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1 or 2, characterized in that: The stabilizer is one or more of zinc stearate, magnesium stearate and calcium stearate.

6. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1, characterized in that: The structure includes a crest region, a trough region and a connection region. The connection region connects the crest region and the trough region. A thickened portion is arranged in the connection region, and a flat region is provided at the bottom of the trough region.

7. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 6, characterized in that: The length of the thickened portion is the middle of the length of the connecting area.

8. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 6, characterized in that: The length of the thickened portion is at least half of the length of the connecting region.

9. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 6, characterized in that: The wave peak height is 20mm~25mm, the wave distance is 40mm~80mm, and the wall thickness is 2.5-3mm.

10. A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to any one of claims 1 to 9, characterized in that: The steps include: S1. The raw materials were mixed in parts by weight, added to a mixer, the temperature was raised to 115 to 125°C, and stirred at 400 to 450 rpm to obtain a mixture; S2 S1 obtained mixture was transferred to a low-speed mixer, rubber oil was added, 120-180 rpm stirring to obtain an extrudate; S3. The extrudate obtained in S2 is transferred to a twin-screw extruder and extruded to obtain a parison; S4. The parison is subjected to corrugated pressing and shaping by a corrugated forming traction block whose linear speed is synchronized with the double rollers and cooled to form the corrugated waterproof board.

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