A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material

Abstract

The present invention relates to the field of building materials, in particular to a corrugated waterproof board produced with waste rigid polyvinyl chloride as raw material, the raw material comprising the following components by weight: 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. The waterproof board of the present invention can improve low temperature resistance while ensuring existing longitudinal tension, bearing capacity and other properties.

Description

Technical Field

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

[0002] The corrugated asphalt waterproof sheet popular in the market in recent years is made of fiber-reinforced asphalt. As a permanent hard slope roof underlay, it can be fully dry, ventilated, dehumidified and insulated, and simplifies the roof layer. It is suitable for construction sites in various weather and conditions, and is resistant to trampling and external damage. It is matched with various synthetic resin tiles, clay tiles, cement tiles, slate tiles, metal tiles, corrugated three-dimensional asphalt tiles, etc. to form a slope roof system that combines three-dimensional waterproofing and drainage. However, the traditional fiber-reinforced corrugated asphalt waterproof sheet is limited in longitudinal tension, high temperature flow resistance, low temperature brittleness and combustion resistance due to the base asphalt, and the production cost is relatively high.

[0003] Polyvinyl chloride (PVC) is a polymer formed by the polymerization of vinyl chloride monomer (VCM) in the presence of initiators such as peroxides and azo compounds, or by the free radical polymerization mechanism under the action of light or heat. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as vinyl chloride resins. PVC has excellent chemical properties such as flame retardancy, insulation, and wear resistance, and is widely used in building materials, light industry, agriculture and other fields. In terms of its specific application, according to the main properties of PVC products, it can be divided into hard products and soft products. Among them, hard products are mainly used in building materials such as pipes and profiles, while soft products are mainly used in films, cables, artificial leather and other aspects.

[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 patent application 2020108384486 submitted by the applicant earlier, the preparation and application of a corrugated unplasticized polyvinyl chloride modified waterproof board, the 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; 1-2 parts of processing aid. This combination formula is combined with the adjustment of the process to obtain a waterproof board with a longitudinal tension of not less than 800N, flexibility: 10℃, bending around a radius of 35mm, no cracks on the surface, heat resistance: 100℃, 2h, no flow, load-bearing capacity: 700 / m 2 Load, deflection should not exceed 3.1mm, combustion performance: not less than B1 grade.

[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 the raw material, which can improve the low temperature resistance while ensuring the existing longitudinal tension, bearing capacity and other performances.

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

[0009] A corrugated waterproof board produced with waste rigid polyvinyl chloride as raw material, the raw material comprises 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] Based on the problem that the low-temperature performance of the waterproof board is poor during actual use, resulting in insufficient bearing performance, the present invention improves the components of the corrugated waterproof board, introduces EPDM rubber and polycarbonate on the premise of using polyvinyl chloride as the main raw material, and adopts suitable fillers and stabilizers. The longitudinal tension, flexibility, heat resistance, deflection and combustion performance of the obtained waterproof board can at least reach the equivalent level of the existing waterproof board, the brittleness at low temperature is reduced, and the low-temperature impact strength at minus 30°C can reach 50KJ / 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. As mentioned in the background technology, 2020108384486, using polyvinyl chloride as the main raw material for waterproof boards can obtain corrugated waterproof boards with good bearing capacity, longitudinal tension, flexibility, heat resistance, deflection, and combustion performance.

[0013] However, the prior art does not consider the performance of corrugated waterproof boards in low temperature and overload environments. After testing, it is found that 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, in order to make full use of waste PVC resources, the applicant studies the use of waste rigid polyvinyl chloride as raw materials for the production of waterproof boards, which can not only reduce the environmental pollution caused by waste rigid polyvinyl chloride, but also recycle resources. However, waste rigid polyvinyl chloride may be worn, aged or damaged due to long-term use or exposure to the environment, resulting in a decrease in its physical properties, and may also be affected by chemical substances, resulting in changes in its chemical properties. Therefore, waste rigid polyvinyl chloride, as the main raw material of corrugated waterproof boards, will reduce the low-temperature properties of corrugated waterproof boards, 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 further improves the structure of the corrugated waterproof board to achieve better supporting performance under low temperatures, and provides a corrugated waterproof board including a crest area, a trough area and a connecting area, wherein 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 area.

[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 mixer, the temperature was raised to 115 to 125°C, and stirred at 400 to 450 rpm to obtain a mixture;

[0025] S2. The mixture obtained in S1 was transferred to a low-speed mixer, rubber oil was added, and stirred at 120-180 rpm to obtain an extrudate;

[0026] S3. The extrudate obtained in S2 is transferred to a twin-screw extruder and extruded to obtain a parison; the plasticizing temperature of the barrel zone of the twin-screw extruder is 180 ℃ to 200 ℃;

[0027] 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 then cooled and shaped to obtain the corrugated waterproof board. Sawing according to the set length means sawing the continuously formed corrugated waterproof board product according to the required length.

[0028] The corrugated waterproof board has the following dimensions: wave height 20mm-25mm, wave distance 40mm-80mm, wall thickness 2.5-3mm, and can be made into large or small wave waterproof boards according to customer needs.

[0029] The corrugated waterproof board obtained by using the raw materials of the above corrugated waterproof board and combining the above preparation method has the following properties:

[0030] The low temperature impact strength at -30℃ 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] Figure 1 This is a schematic diagram of a first corrugated waterproof board made according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of a second corrugated waterproof board made 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 is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0035] Example 1

[0036] A corrugated waterproof board produced with waste rigid polyvinyl chloride as raw material, the raw material comprises 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, wall panels, etc.

[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 TV 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. 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 with waste rigid polyvinyl chloride as raw material, the raw material comprises 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 with waste rigid polyvinyl chloride as raw material, the raw material comprises 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 with waste rigid polyvinyl chloride as raw material, the raw material comprises 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 with waste rigid polyvinyl chloride as raw material, the raw material comprises 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 is replaced by EPDM rubber.

[0085] Comparative Example 5

[0086] The difference from Example 5 is that the raw material composition is different. This comparative example is as follows: 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 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] The difference from Example 5 is that the raw material composition is different. This comparative example is as follows: 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 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 by butyl rubber.

[0089] Comparative Example 7

[0090] The difference from Example 1 is that the ratio of the raw material composition 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 material composition 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 material composition 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 mixer, the temperature was raised to 120 ° C, and stirred at a speed of 450 rpm to obtain a mixture;

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

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

[0103] 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 then cooled and shaped to obtain the corrugated waterproof board. Sawing according to the set length means sawing the continuously formed corrugated waterproof board product according to the required 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 is obtained, see Figure 1 , including a crest region 100, a trough region 200 and a connecting region 300, wherein the connecting region connects the crest region and the trough region, and has a conventional corrugated structure with dimensions of a wave height of 25 mm, a wave distance of 50 mm, and a wall thickness of 2.5 mm.

[0106] The second corrugated waterproof board obtained is shown in Figure 2, including a crest region 100, a trough region 200 and a connection region 300, the connection region connects the crest region and the trough region, a thickened portion 301 is provided in the connection region, and a flat region 201 is provided at the bottom of the trough region. The length of the thickened portion is the middle of the length of the connection region. The length of the thickened portion accounts for half of the length of the connection region. The dimensions are a wave height of 25 mm, a wave distance of 50 mm, a wall thickness of 2.5 mm, a wall thickness of the thickened portion of 3.5 mm, and a flat region width of 5 mm.

[0107] Examples 1-9 and Comparative Examples 1-9 adopt the preparation method of Example 10 to prepare two types of corrugated waterproof boards respectively. The relevant properties of the obtained corrugated waterproof boards are tested, and the test items and test results are shown in Table 1 (the first type of corrugated waterproof board) and Table 2 (the second type of corrugated waterproof board).

[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] It can be seen from Table 1 that the longitudinal tensile force, low-temperature impact strength and brittle temperature of the corrugated waterproof board obtained in each embodiment of the present invention are better than those of the comparative examples. Specifically, Embodiments 1 to 4 are the basic solutions of the present invention, using waste rigid polyvinyl chloride as the main raw material, with a longitudinal tensile force of 870N or more and a low-temperature impact strength of 36KJ / m at -30°C. 2 As shown above, the brittle temperature reaches below -40°C. Among them, Examples 2 and 3 optimize the composition of the filler. Although the longitudinal tension has no obvious change 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 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 scheme 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, but adds acrylic resin to the components with PVC as the main raw material. The performance of the waterproof board obtained is equivalent in longitudinal tensile force, 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 is added, and in Comparative Example 3, no EPDM rubber is added. The results show that the longitudinal tensile force decreases to a certain extent, and the low-temperature performance decreases more significantly. The low-temperature impact strength is only 16.9 KJ / m 2 and 19.8KJ / m 2 , the brittle temperatures reach minus 21° C. and minus 18° C., respectively. It can be seen that polycarbonate and EPDM rubber are both indispensable in the present invention.

[0120] Comparative Examples 4, 5 and 6 are experiments with other alternative substances conducted in the process of studying the two additive substances, polycarbonate and EPDM rubber. It is finally shown that polycarbonate and EPDM rubber, as additive substances, are added to the formula with waste rigid polyvinyl chloride as the main raw material, and the low-temperature performance is the best. 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 tension is equivalent 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 the longitudinal tension and low-temperature performance (low-temperature impact strength and brittle temperature) are significantly reduced.

[0121] The flammability rating of the corrugated waterproofing sheets was also tested according to the GB8624-2012 standard. The results showed that the corrugated waterproofing sheets 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 tension of the second corrugated waterproof board is better than the longitudinal tension 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 tension and low-temperature impact strength are affected by the structure of the waterproof board. The second waterproof board of the present invention adopts a special structure, which has better longitudinal tension 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 EPDM rubber, 3-10 parts of polycarbonate, 10-18 parts of filler, and 3-6 parts of stabilizer. The corrugated waterproof board structure includes 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 arranged in the connecting area, and a flat area is provided at the bottom of the trough area.

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 length of the thickened portion is the middle of the length of the connecting area.

7. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1, characterized in that: The length of the thickened portion is at least half of the length of the connecting region.

8. The corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material according to claim 1, characterized in that: The wave peak height is 20mm~25mm, the wave distance is 40mm~80mm, and the wall thickness is 2.5-3mm.

9. A corrugated waterproof board produced from waste rigid polyvinyl chloride as raw material as claimed in any one of claims 1 to 8, 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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