Preparation method and application of thermal insulation and exposed waterproof integrated material

Abstract

The present invention belongs to the technical field of thermal insulation coatings, and specifically relates to a preparation method and application of an integrated thermal insulation and exposed waterproof material. The preparation method of the integrated material includes the following steps: A. Weigh each component according to the ratio of the integrated material for use; B. Add part of the water, emulsifier and all the hydrophobic emulsion to a stirring container, stir and emulsify to obtain a pre-emulsion; C. Take another stirring container, add the remaining water and emulsifier, then add all the silica aerogel, hollow glass beads and titanium dioxide, stir evenly, then add the pre-emulsion and additives, stir evenly and filter to obtain the integrated material. The present invention improves the thermal insulation and waterproof properties of the integrated material by changing the ratio of the components of the integrated material, prevents the powdering of the surface of the formed coating, thereby increasing the performance and service life of the coating, having better weather resistance and not easy to crack.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal insulation coatings, and in particular relates to a preparation method and application of a thermal insulation and exposed waterproof integrated material. Background Art

[0002] In order to reduce the heat conduction between the interior of the building and the external environment, thermal insulation treatment is usually carried out on the roof of the building. The thermal insulation treatment is generally carried out by applying thermal insulation paint on the roof of the building. The thermal insulation paint not only has thermal insulation and heat preservation effects, but also has a certain waterproof effect.

[0003] However, the current thermal insulation coatings are prone to problems during the coating process due to their coating thickness. When the thermal insulation coating is applied thinly, it can only reflect sunlight and insulate, but cannot provide insulation for the building. When applied thickly, the roof will sink due to problems with the building itself. At this time, the roof will deform and crack, resulting in insufficient tension and elongation of the thermal insulation coating, which will cause cracks and peeling in the insulation layer, causing the roof to leak. After moisture enters the roof, the water vapor will delaminate the thermal insulation coating when it is discharged from the surface, causing hollowing. This repeated cycle will eventually lead to the failure of the thermal insulation and waterproofing effects of the thermal insulation layer. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a method for preparing and applying an integrated thermal insulation and exposed waterproof material. By changing the component ratio of the integrated material, the thermal insulation and waterproof properties of the integrated material are improved, and the surface of the formed coating is prevented from powdering, thereby increasing the performance and service life of the coating, having better weather resistance and not easy to crack.

[0005] The specific technical solution adopted by the present invention is:

[0006] The integrated material includes, by mass fraction, 60-80 parts of hydrophobic emulsion, 80-100 parts of silica aerogel, 30-40 parts of hollow glass beads, 40-60 parts of titanium dioxide, 50-60 parts of water, 5-10 parts of emulsifier, and 20-40 parts of additives;

[0007] The preparation method of the integrated material comprises the following steps:

[0008] A. Weigh each component according to the proportion of the integrated material for use;

[0009] B. Add 40-60% by weight of water, 40-60% by weight of emulsifier and all the hydrophobic emulsion into a stirring container, and stir and emulsify for 15-30 minutes to obtain a pre-emulsion;

[0010] C. Take another stirring container, add the remaining water and emulsifier, then add all the silica aerogel, hollow glass beads and titanium dioxide, stir evenly, then add the pre-emulsified liquid and additives, stir evenly and filter to obtain the integrated material.

[0011] The hydrophobic emulsion comprises 10-12 parts of acrylic emulsion and 1-1.5 parts of fluorocarbon emulsion by weight.

[0012] The auxiliary agent includes one or more of a defoamer, a bactericide, a thickener, a film-forming auxiliary agent, and a dispersant.

[0013] The silica aerogel is silica aerogel particles with a nanopore structure.

[0014] The titanium dioxide is rutile titanium dioxide.

[0015] The application of integrated materials to roof waterproofing includes the following steps:

[0016] S1. Apply the integrated material to the roof surface to form a base coat;

[0017] S2, laying a polypropylene cloth coil on the surface of the base coating, wherein a plurality of groups of groove-shaped folds are arranged at intervals on the surface of the polypropylene cloth coil, wherein the length direction of the folds is the same as the water flow direction of the roof, and the concave ends of the folds face the base coating and are embedded in the base coating;

[0018] S3. Apply the integrated material on top of the polypropylene cloth roll to form an upper coating layer. The grooves formed by the folds of the polypropylene cloth roll are filled and leveled with the help of the integrated material, thus completing the application of the integrated material in roof waterproofing.

[0019] The laying direction of the polypropylene cloth coil is perpendicular to the water flow direction of the roof. The multi-level polypropylene cloth coil is arranged step by step, and the bottom of the upper level polypropylene cloth coil is pressed above the top of the lower level polypropylene cloth coil. The overlapping part width of the upper level polypropylene cloth coil and the lower level polypropylene cloth coil is 10-15cm.

[0020] The thickness of the base coating is 6-8 mm, the thickness of the top coating is 4.5-6 mm, and the thickness of the polypropylene cloth coil is 1.2-1.5 mm.

[0021] The method for forming the folds comprises the following steps:

[0022] S201, laying the polypropylene cloth coil on the surface of the base coating, and using a scraper to flatten the surface of the polypropylene cloth coil by 20-40 cm along the unwinding direction of the polypropylene cloth coil;

[0023] S202, then using a scraper to push the polypropylene cloth coil and the integrated material to form a ridged strip, wherein the length direction of the strip is perpendicular to the unwinding direction of the polypropylene cloth coil;

[0024] S203, using a scraper to press downward along the length direction of the prefabricated strip to form a groove, the integrated material below the groove overflows to both sides of the groove and lifts up the polypropylene cloth roll to form an arched side, and the groove and the sides of the groove together form a wavy fold.

[0025] The beneficial effects of the present invention are:

[0026] 1. Compared with the traditional thermal insulation coating, the present invention first replaces the ordinary titanium dioxide in the raw material with Infrared reflective titanium dioxide has better heat insulation effect and sunlight reflectivity, while changing traditional aerogel to Nanoporous silica aerogel particles have a lower density and a small thermal conductivity coefficient, thereby playing a better role in heat insulation. In addition, the integrated material of the present invention is also added with a hydrophobic emulsion, which increases the hydrophobicity of the integrated material and reduces the water absorption rate. While giving the coating a waterproof effect, it can also prevent the surface of the formed coating from powdering, thereby increasing the performance and service life of the coating, having better weather resistance and not easy to crack.

[0027] 2. In the present invention, an integrated material is used as a primer and an upper coating, and a polypropylene cloth coil is used as a middle coating, so that the thermal insulation layer of the roof is formed into a sandwich-like three-layer structure. First, the polypropylene cloth coil is used as a splicing layer to divide the traditional thermal insulation layer into multiple layers. While increasing the thickness of the overall thermal insulation layer, the thickness of the single-layer primer and upper coating formed by the integrated material is reduced, thereby ensuring the overall thickness of the thermal insulation layer and avoiding the problems caused by the current thick coating of the thermal insulation layer; secondly, the polypropylene cloth coil itself is used as a waterproof cloth, which increases the waterproof performance of the thermal insulation layer. At the same time, due to the polypropylene cloth coil, compared with the concrete roof, the bonding force between the integrated material and the non-woven fabric is better, thereby increasing the adhesion of the integrated material and solving the problem of powdering of the coating surface.

[0028] 3. The polypropylene cloth coil in the present invention is also provided with folds. During the long-term use of the building, the roof is prone to deformation and cracking. Although the integrated material in the present invention has better elongation, the insulation layer is in the tensile deformation condition for a long time, which will accelerate the aging of the coating, resulting in coating cracks, peeling and other phenomena. Therefore, in the present invention, folds are pre-arranged to reserve deformation space for the deformation of the insulation layer. When the deformation and cracking of the roof drives the insulation layer to deform, the excess insulation layer at the fold moves to both sides or one side, thereby avoiding the generation of tensile stress inside the insulation layer and ensuring the service life of the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the structure of the thermal insulation layer;

[0030] Figure 2 The forming process of the fold 1;

[0031] Figure 3 The forming process of the fold 2;

[0032] Figure 4 The forming process of the fold 3;

[0033] Figure 5 The forming process of the fold 4;

[0034] Figure 6 The forming process of the fold 5;

[0035] In the attached drawings, 1, roof, 2, base coating, 3, polypropylene cloth coil, 4, scraper, 5, folds, 6, top coating. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0037] The silica aerogel in the present invention is from Shanghai Aorun Chemical Co., Ltd. Model silica aerogel, the specific surface area of ​​the silica aerogel is 600-800m 2 / g, bulk density is 0.04-0.06g / cm 3 , thermal conductivity is 0.016-0.02W / (m·K), porosity is 90-95%, and particle size is 50μm;

[0038] Titanium dioxide is from Shanghai Aorun Chemical Co., Ltd. Model: Infrared reflective titanium dioxide. 1. Specific embodiments

[0040] The integrated material includes, by mass fraction, 60-80 parts of hydrophobic emulsion, 80-100 parts of silica aerogel, 30-40 parts of hollow glass beads, 40-60 parts of titanium dioxide, 50-60 parts of water, 5-10 parts of emulsifier, and 20-40 parts of additives;

[0041] The preparation method of the integrated material comprises the following steps:

[0042] A. Weigh each component according to the ratio of the integrated materials for use;

[0043] B. Add 40-60% by weight of water, 40-60% by weight of emulsifier and all the hydrophobic emulsion into a stirring container, and stir and emulsify for 15-30 minutes to obtain a pre-emulsion;

[0044] C. Take another stirring container, add the remaining water and emulsifier, then add all the silica aerogel, hollow glass beads and titanium dioxide, stir evenly, then add the pre-emulsified liquid and additives, stir evenly and filter to obtain the integrated material.

[0045] The hydrophobic emulsion comprises 10-12 parts of acrylic emulsion and 1-1.5 parts of fluorocarbon emulsion by weight.

[0046] The auxiliary agent includes one or more of a defoamer, a bactericide, a thickener, a film-forming auxiliary agent, and a dispersant.

[0047] The silica aerogel is silica aerogel particles with a nanopore structure.

[0048] The titanium dioxide is rutile titanium dioxide.

[0049] Compared with the traditional thermal insulation coating, the present invention first replaces the ordinary titanium dioxide in the raw material with Infrared reflective titanium dioxide has better heat insulation effect and sunlight reflectivity, while changing traditional aerogel to Nanoporous silica aerogel particles have a lower density and a small thermal conductivity coefficient, thereby playing a better role in heat insulation. In addition, the integrated material of the present invention is also added with a hydrophobic emulsion, which increases the hydrophobicity of the integrated material and reduces the water absorption rate. While giving the coating a waterproof effect, it can also prevent the surface of the formed coating from powdering, thereby increasing the performance and service life of the coating, having better weather resistance and not easy to crack.

[0050] The integrated material is applied to the roof 1 for waterproofing, including the following steps:

[0051] S1, applying the integrated material to the surface of the roof 1 to form a base coating 2;

[0052] S2, laying a polypropylene cloth coil 3 on the surface of the base coating 2, wherein a plurality of groups of groove-shaped folds 5 are arranged at intervals on the surface of the polypropylene cloth coil 3, wherein the length direction of the folds 5 is the same as the water flow direction of the roof 1, and the concave ends of the folds 5 face the base coating 2 and are embedded in the base coating 2;

[0053] S3, applying the integrated material on the polypropylene cloth coil 3 to form an upper coating layer 6, and filling and leveling the grooves formed by the folds 5 of the polypropylene cloth coil 3 with the help of the integrated material, thereby completing the application of the integrated material in the waterproofing of the roof 1.

[0054] like Figure 1 As shown, in the present invention, an integrated material is used as a primer and an upper coating, and a polypropylene cloth coil 3 is used as a middle coating, so that the thermal insulation layer of the roof 1 is formed into a sandwich-like three-layer structure. First, the polypropylene cloth coil 3 is used as a splicing layer to divide the traditional thermal insulation layer into multiple layers. While increasing the thickness of the overall thermal insulation layer, the thickness of the single-layer primer 2 and the upper coating 6 formed by the integrated material is reduced, thereby ensuring the overall thickness of the thermal insulation layer and avoiding the problems caused by the current thick coating of the thermal insulation layer; secondly, the polypropylene cloth coil 3 itself is used as a waterproof cloth, which increases the waterproof performance of the thermal insulation layer. At the same time, due to the polypropylene cloth coil 3, compared with the roof 1 made of concrete, the bonding force between the integrated material and the non-woven fabric is better, thereby increasing the adhesion of the integrated material and solving the problem of powdering of the coating surface.

[0055] The polypropylene cloth coil 3 in the present invention is also provided with folds 5. During the long-term use of the building, the roof 1 is prone to deformation and cracking. Although the integrated material in the present invention has better elongation, the insulation layer is under the tensile deformation condition for a long time, which will accelerate the aging of the coating, resulting in coating cracks, peeling and other phenomena. Therefore, in the present invention, by pre-arranging folds 5, deformation space is reserved for the deformation of the insulation layer. When the deformation and cracking of the roof 1 drives the insulation layer to deform, the excess insulation layer at the folds 5 moves to both sides or one side, thereby avoiding the generation of tensile stress inside the insulation layer and ensuring the service life of the insulation layer.

[0056] The unwinding direction of the polypropylene cloth coil 3 is perpendicular to the water flow direction of the roof 1. The multi-level polypropylene cloth coils 3 are arranged step by step, and the bottom of the upper-level polypropylene cloth coil 3 is pressed above the top of the lower-level polypropylene cloth coil 3. The overlapping part width of the upper-level polypropylene cloth coil 3 and the lower-level polypropylene cloth coil 3 is 10-15cm. In the process of forming the fold 5, the polypropylene cloth coil 3 needs to be pressed to form a groove. If the polypropylene cloth coil 3 is unrolled along the water flow direction, that is, the length direction of the fold 5 is the same as the length direction of the polypropylene cloth coil 3, since the width direction of the polypropylene cloth coil 3 is narrow, when the polypropylene cloth coil 3 is pressed to form the fold 5, the fold 5 is close to the edge of the polypropylene cloth coil 3, which easily causes the edge of the polypropylene cloth coil 3 to curl up, affecting the flatness of the thermal insulation layer; however, the length direction of the polypropylene cloth coil 3 is long, and the distance between the fold 5 and the two sides of the length direction of the polypropylene cloth coil 3 is far, so the edge of the polypropylene cloth coil 3 is not easy to curl up, ensuring the molding quality of the thermal insulation layer.

[0057] The thickness of the base coating 2 is 6-8mm, the thickness of the upper coating 6 is 4.5-6mm, and the thickness of the polypropylene cloth coil 3 is 1.2-1.5mm. In the present invention, the thickness of the base coating 2 is greater than that of the upper coating 6. This is because the base coating 2 needs to reserve space for the grooves of the folds 5 to be embedded. The thickness of the traditional thermal insulation coating is about 10mm. When the thickness of the thermal insulation layer exceeds 10mm, deformation and cracking are prone to occur. In the present invention, the thickness of the base coating 2 and the upper coating 6 are both more than 10mm, and deformation and cracking are not prone to occur. At the same time, the sum of the thickness of the base coating 2, the upper coating 6 and the polypropylene cloth coil 3 is 1.7-5.5mm higher than the thickness of the traditional thermal insulation layer, and has better thermal insulation effect.

[0058] like Figure 2-6 The method for forming the fold 5 comprises the following steps:

[0059] S201, laying the polypropylene cloth coil 3 on the surface of the base coating 2, and using a scraper 4 to scrape the surface of the polypropylene cloth coil 3 by 20-40 cm along the unwinding direction of the polypropylene cloth coil 3;

[0060] S202, then using a scraper 4 to push the polypropylene cloth coil 3 and the integrated material to form a ridged strip, the length direction of the strip is perpendicular to the unwinding direction of the polypropylene cloth coil 3;

[0061] S203, using a scraper 4 to press downward along the length direction of the prefabricated strip to form a groove, the integrated material below the groove overflows to both sides of the groove and lifts up the polypropylene cloth coil 3 to form an arched side, and the groove and the sides of the groove together form a wavy fold 5.

[0062] Figures 2 to 6 That is the forming process of the folds 5. Compared with the V-shaped folds 5, the wavy folds 5 in the present invention reserve more deformation space for the deformation of the thermal insulation layer. At the same time, the surface area of ​​the wavy folds 5 is larger, which increases the bonding area between the polypropylene cloth coil 3 and the base coating 2 and the upper coating 6, thereby ensuring the integrity of the formed thermal insulation layer.

[0063] 2. Performance Test

[0064] Example 1

[0065] The integrated material comprises, by mass fraction, 63 parts of acrylic emulsion, 7 parts of fluorocarbon emulsion, 90 parts of silica aerogel, 35 parts of hollow glass beads, 50 parts of titanium dioxide, 55 parts of water, 8 parts of emulsifier, 2 parts of defoamer, 3 parts of bactericide, 5 parts of thickener, 5 parts of film-forming aid, and 7 parts of dispersant;

[0066] The silica aerogel Shanghai Aorun Chemical Co., Ltd. Model silica aerogel, titanium dioxide is from Shanghai Aorun Chemical Co., Ltd. Model: Infrared reflective titanium dioxide.

[0067] Example 2

[0068] An integrated material is prepared according to the ratio of Example 1, and then a heat insulation layer is formed on the roof using the method of the present invention. The specific steps are as follows:

[0069] S1. Apply the integrated material to the roof surface to form a base coat;

[0070] S2, laying a polypropylene cloth coil on the surface of the base coating, wherein a plurality of groups of groove-shaped folds are arranged at intervals on the surface of the polypropylene cloth coil, wherein the length direction of the folds is the same as the water flow direction of the roof, and the concave ends of the folds face the base coating and are embedded in the base coating;

[0071] S3. Apply an integrated material on the polypropylene cloth coil to form an upper coating layer. The grooves formed by the folds of the polypropylene cloth coil are filled and leveled with the help of the integrated material. The base coating layer, the upper coating layer and the polypropylene cloth coil together form a heat insulation layer for the roof.

[0072] The thickness of the base coating is 7 mm, the thickness of the top coating is 5 mm, the thickness of the polypropylene cloth coil is 1.2 mm, and the total thickness of the thermal insulation layer is 13.2 mm.

[0073] Example 3

[0074] An integrated material is prepared according to the ratio of Example 1, and then the integrated material is used to form a heat insulation layer on the roof. The specific steps are as follows:

[0075] S1. Apply the integrated material to the roof surface to form a base coat;

[0076] S2. Lay the polypropylene cloth coil flat on the surface of the base coating;

[0077] S3. Apply an integrated material on the polypropylene cloth coil to form an upper coating layer. The base coating layer, the upper coating layer and the polypropylene cloth coil together form a heat insulation layer of the roof;

[0078] The thickness of the base coating is 7 mm, the thickness of the top coating is 5 mm, the thickness of the polypropylene cloth coil is 1.2 mm, and the total thickness of the thermal insulation layer is 13.2 mm.

[0079] Comparative Example 1

[0080] The thermal insulation coating includes, by mass fraction, 70 parts of acrylic emulsion, 90 parts of silica aerogel, 35 parts of hollow glass beads, 50 parts of titanium dioxide, 55 parts of water, 8 parts of emulsifier, 2 parts of defoamer, 3 parts of fungicide, 5 parts of thickener, 5 parts of film-forming aid, and 7 parts of dispersant;

[0081] The silica aerogel is aerogel powder produced by Shanghai Shupeng New Materials Technology Co., Ltd., and the titanium dioxide is anatase titanium dioxide powder produced by Shanghai Hongjun New Materials Technology Co., Ltd.

[0082] Comparative Example 2

[0083] A heat-insulating coating was prepared according to the ratio of Comparative Example 1, and then the heat-insulating coating was thickly applied to the roof to form a heat-insulating layer. The thickness of the heat-insulating layer was 13.2 mm.

[0084] The performance of the heat insulation layers formed in Examples 2-3 and Comparative Example 2 was tested, and the test results are shown in Table 1.

[0085] Table 1

[0086] Example 2 Example 3 Comparative Example 2 Elongation at break % ≥1000 ≥400 ≥300 Tear strength(N / mm) ≥125 ≥50 ≥15 Solar reflectance ≥0.7 ≥0.7 ≥0.65 Hemispherical emissivity >0.95 >0.95 >0.85 Thermal conductivity 0.05-0.06w / (m·k) 0.05-0.06w / (m·k) >0.08-≤0.15w / (m·k) Infrared reflectance ≥0.85 ≥0.85 ≥0.80

[0087] It can be seen from Table 1 that compared with the thermal insulation layer formed by traditional thermal insulation coatings, the thermal insulation layer formed by the integrated material of the present invention in Example 2 and Example 3 shows better effects in various performance tests such as elongation at break, tear strength, and solar reflectance.

[0088] At the same time, from the comparison between Example 2 and Example 3, it can be seen that the elongation at break and the tear strength performance of the thermal insulation layer in Example 2 are better. This is because the presence of the folds reserves more deformation space for the deformation of the thermal insulation layer.

Claims

1. A method for preparing a thermal insulation and exposed waterproof integrated material, characterized in that: The integrated material comprises, by mass fraction, 60-80 parts of hydrophobic emulsion, 80-100 parts of silica aerogel, 30-40 parts of hollow glass beads, 40-60 parts of titanium dioxide, 50-60 parts of water, 5-10 parts of emulsifier, and 20-40 parts of additives; The preparation method of the integrated material comprises the following steps: A. Weigh each component according to the proportion of the integrated material for use; B. Add 40-60% by weight of water, 40-60% by weight of emulsifier and all the hydrophobic emulsion into a stirring container, and stir and emulsify for 15-30 minutes to obtain a pre-emulsion; C. Take another stirring container, add the remaining water and emulsifier, then add all the silica aerogel, hollow glass beads and titanium dioxide, stir evenly, then add the pre-emulsified liquid and additives, stir evenly and filter to obtain the integrated material.

2. The method for preparing a heat-insulating and exposed waterproof integrated material according to claim 1, characterized in that: The hydrophobic emulsion comprises 10-12 parts of acrylic emulsion and 1-1.5 parts of fluorocarbon emulsion by weight.

3. The method for preparing a heat-insulating and exposed waterproof integrated material according to claim 1, characterized in that: The auxiliary agent includes one or more of a defoamer, a bactericide, a thickener, a film-forming auxiliary agent, and a dispersant.

4. The method for preparing a heat-insulating and exposed waterproof integrated material according to claim 1, characterized in that: The silica aerogel is silica aerogel particles with a nanopore structure.

5. The method for preparing a heat-insulating and exposed waterproof integrated material according to claim 1, characterized in that: The titanium dioxide is rutile titanium dioxide.

6. An application method of a heat-insulating and exposed waterproof integrated material, wherein the integrated material is obtained by the preparation method of a heat-insulating and exposed waterproof integrated material as claimed in claim 1, characterized in that: The integrated material includes the following steps when applied to roof waterproofing: S1. Apply the integrated material to the roof surface to form a base coat; S2, laying a polypropylene cloth coil on the surface of the base coating, wherein a plurality of groups of groove-shaped folds are arranged at intervals on the surface of the polypropylene cloth coil, wherein the length direction of the folds is the same as the water flow direction of the roof, and the concave ends of the folds face the base coating and are embedded in the base coating; S3. Apply the integrated material on top of the polypropylene cloth roll to form an upper coating layer. The grooves formed by the folds of the polypropylene cloth roll are filled and leveled with the help of the integrated material, thus completing the application of the integrated material in roof waterproofing.

7. The application method of the heat-insulating and exposed waterproof integrated material according to claim 6 is characterized in that: The unwinding direction of the polypropylene cloth coil is perpendicular to the water flow direction of the roof. The multi-level polypropylene cloth coils are arranged step by step, and the bottom of the upper level polypropylene cloth coil is pressed above the top of the lower level polypropylene cloth coil. The overlapping part width of the upper level polypropylene cloth coil and the lower level polypropylene cloth coil is 10-15cm.

8. The application method of the heat-insulating and exposed waterproof integrated material according to claim 6, characterized in that: The thickness of the base coating is 6-8 mm, the thickness of the top coating is 4.5-6 mm, and the thickness of the polypropylene cloth coil is 1.2-1.5 mm.

9. The application method of the heat-insulating and exposed waterproof integrated material according to claim 6, characterized in that: The method for forming the folds comprises the following steps: S201, laying the polypropylene cloth coil on the surface of the base coating, and using a scraper to flatten the surface of the polypropylene cloth coil by 20-40 cm along the unwinding direction of the polypropylene cloth coil; S202, then using a scraper to push the polypropylene cloth coil and the integrated material to form a ridged strip, wherein the length direction of the strip is perpendicular to the unwinding direction of the polypropylene cloth coil; S203, using a scraper to press downward along the length direction of the prefabricated strip to form a groove, the integrated material below the groove overflows to both sides of the groove and lifts up the polypropylene cloth roll to form an arched side, and the groove and the sides of the groove together form a wavy fold.

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