A production process for lightweight waterproof membrane and the waterproof membrane obtained

Abstract

This application relates to the field of waterproof membranes, and more specifically, to a manufacturing process and the resulting lightweight waterproof membrane. The membrane is prepared by the following method: 1) Heating a PE-PP composite material to 295-305℃ and holding it at that temperature for 28-35 minutes to obtain a molten material; 2) Extruding the molten material onto the surface of a PP nonwoven fabric to form a first coating layer to be fully cured; 3) Laying a PP woven fabric onto the surface of the fully cured coating layer, and then extruding the molten material onto the surface of the PP nonwoven fabric to form a second coating layer to be fully cured, obtaining a semi-finished product; 4) Pressing the semi-finished product together and cooling it until the first and second coating layers are fully cured and bonded, obtaining a lightweight waterproof membrane. The above process yields a waterproof membrane that combines excellent lightweight properties, waterproofness, and mechanical properties.

Description

Technical Field

[0001] This application relates to the field of waterproof membranes, and more specifically, it relates to a manufacturing process for a lightweight waterproof membrane and the resulting waterproof membrane. Background Technology

[0002] Waterproof membranes, as an important functional material, are widely used in construction, transportation, water conservancy, and other fields. With the increasing demand for environmentally friendly and high-efficiency materials, waterproof membranes not only need to possess excellent waterproof performance but also meet requirements for lightweighting, durability, and mechanical properties to adapt to complex and changing environments. Currently, waterproof membrane technology has developed to the stage of multi-layer composite structures. This structure can effectively improve the overall performance of the material, but it also brings technical challenges.

[0003] In existing technologies, multi-layer composite structures are typically used to address the waterproofing and mechanical properties of waterproof membranes. For example, different fabric layers are bonded to the waterproof layer using adhesives, or multiple layers are laminated together using methods such as hot pressing. Additionally, methods to improve the performance of waterproof membranes include altering material ratios or adding functional additives. These methods primarily include: using multi-layer composite structures such as polypropylene nonwoven fabric and ethylene woven fabric, connecting the layers with adhesives; adjusting the proportions of materials in each layer, such as increasing the thickness of the waterproof layer; and adding auxiliary components such as inorganic fillers to the materials.

[0004] However, the aforementioned conventional methods have significant drawbacks: while multi-layer structures can enhance performance, they often lead to an increase in the weight of the waterproof membrane, affecting its lightweight characteristics; at the same time, the bonding method is prone to causing unstable interlayer bonding, especially in high-temperature and high-humidity environments, which can easily lead to cracking or delamination, thereby reducing the waterproof effect and mechanical properties. Therefore, there is an urgent need for a solution that can maintain lightweight while improving waterproof and mechanical properties. Summary of the Invention

[0005] In order to maintain lightweight while improving waterproofness and mechanical properties, this application provides a manufacturing process for a lightweight waterproof membrane and the resulting waterproof membrane.

[0006] In a first aspect, this application provides a manufacturing process for a lightweight waterproof membrane, which is obtained by the following method:

[0007] 1) Heat the PE-PP composite material to 295-305℃, then keep it at that temperature for 28-35 minutes to obtain the molten material;

[0008] 2) The molten material is extruded and coated onto the surface of the PP nonwoven fabric to form the first coating layer that will be fully cured on the PP nonwoven fabric;

[0009] 3) Next, the PP woven fabric is bonded to the surface of the coating layer to be fully cured, and the molten material is extruded and coated onto the surface of the PP nonwoven fabric to form a second coating layer to be fully cured on the surface of the PP nonwoven fabric, thus obtaining a semi-finished product.

[0010] 4) Press the semi-finished products together and cool them until the first and second coating layers are completely cured and bonded to obtain a lightweight waterproof membrane;

[0011] In every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is (10-20):(10-20):(50-60):15; the pressing pressure during the pressing process is 4-8 kg / cm². 2 The pressing temperature is 280-305℃.

[0012] By adopting the above technical solution, this production process can produce a lightweight waterproof membrane with excellent waterproof and mechanical properties. The specific effects are as follows: First, precise heating and constant temperature treatment of the PE-PP composite material ensures complete melting of the material, thereby improving the uniformity of the subsequent lamination process and enhancing waterproof performance. Second, by controlling the weight ratio between the first lamination layer, the second lamination layer, the PP woven fabric, and the PP non-woven fabric, the connection stability of each layer is optimized, significantly improving the overall performance of the waterproof membrane while maintaining lightweight construction. Finally, pressing under specific pressure and temperature conditions further strengthens the adhesion between the layers, effectively preventing delamination or cracking in harsh environments such as high temperature and high humidity, thus greatly improving the durability and overall performance of the waterproof membrane.

[0013] Preferably, the screw temperature in the extrusion process is set as follows: Zone 1 165-175℃, Zone 2 250-270℃, Zone 3 275-285℃, Zone 4 295-305℃, and Zone 5 295-305℃, and the die temperature in the extrusion process is 295-305℃.

[0014] By adopting the above technical solution and precisely controlling the temperature of each zone of the screw and the die temperature during the extrusion process, the melting state and fluidity of the PE-PP composite material at different stages can be ensured, thereby improving the uniformity and stability of the coating. Specifically, the temperature gradient design of zones one to five helps the material to gradually melt and fully plasticize, while the die temperature setting ensures the stability and coating performance of the molten material during extrusion, further enhancing the bonding strength and overall performance between the layers of the waterproof membrane.

[0015] Preferably, in the PE-PP composite material, the weight ratio of PE to PP is 1:(2.5-3.5).

[0016] By adopting the above technical solution, the weight ratio of PE to PP is set to 1:(2.5-3.5), which gives the PE-PP composite material better fluidity and uniformity in the molten state. This allows for better coating onto the surface of PP nonwoven fabric and PP woven fabric during the lamination process, forming a uniform first and second lamination layer. This ratio optimizes the bonding force between the layers, improves the overall waterproof performance and mechanical properties of the waterproof membrane, and reduces interlayer cracking or separation caused by improper material ratios, further enhancing the durability and stability of the waterproof membrane.

[0017] Preferably, the specific process in step 1) is as follows: heating the PE-PP composite material for 85-95 minutes to raise its temperature to 295-305℃, and then holding it at a constant temperature for 28-35 minutes to obtain the molten material.

[0018] By adopting the above technical solution, the PE-PP composite material, after being heated for 85-95 minutes to 295-305℃ and then held at that temperature for 28-35 minutes, ensures complete melting of the composite material and exhibits excellent flow properties. These process conditions help improve the uniformity of the molten material, making it easier to coat the surface of PP nonwoven and PP woven fabrics, forming a uniform first and second coating layer. A uniform coating layer enhances the connection stability of the waterproof membrane's layer structure in different areas, thereby improving the overall waterproof and mechanical properties. Simultaneously, these process parameters also reduce the occurrence of layer structure cracking under long-term high temperature and high humidity environments, improving the durability of the waterproof membrane.

[0019] Preferably, the number-average molecular weight of the PP is 100,000 to 300,000.

[0020] By adopting the above technical solution, the number-average molecular weight of PP is limited to 100,000-300,000, which optimizes the melting performance and flowability of PE-PP composite materials. This makes it easier for the molten material to be evenly coated onto the surface of PP nonwoven fabric and PP woven fabric during the coating process, thereby forming a first and second coating layer of uniform thickness. This not only improves the bonding stability between the layers of the waterproof membrane but also further enhances the overall waterproof performance and mechanical properties of the waterproof membrane. In addition, during long-term use, PP within this molecular weight range helps reduce interlayer cracking and improves the durability of the waterproof membrane.

[0021] Preferably, the number-average molecular weight of the PE is 200,000 to 500,000.

[0022] By adopting the above technical solution and controlling the number-average molecular weight of PE to 200,000-500,000, the performance of PE material can be optimized, giving it better fluidity and coating uniformity in the molten state, thereby improving the formation quality of the first and second coating layers. This helps to enhance the bonding stability between the layers of the waterproof membrane, further improving waterproof performance and mechanical properties, while reducing problems such as layer structure cracking under high humidity and high temperature environments, and improving the overall durability of the waterproof membrane.

[0023] Preferably, the PP nonwoven fabric has a strength of 10-100 g / m². 2 The PP fiber diameter is 3-5D and the length is 50-60mm; the PP woven fabric has a weight of 30-120g / m². 2 .

[0024] By adopting the above technical solution, the basis weight of PP nonwoven fabric is set to 10-100 g / m². 2 The fiber diameter is 3-5D and the length is 50-60mm, ensuring that the PP nonwoven fabric has good air permeability and structural stability. It also forms a tighter bond with the first and second coating layers, improving the overall performance of the waterproof membrane. Furthermore, the weight of the PP woven fabric is set at 30-120g / m². 2 While ensuring lightweight design, the mechanical properties of the waterproof membrane are further enhanced, reducing the risk of aging or delamination in high humidity and high temperature environments.

[0025] Preferably, the PE-PP composite material further includes 3-8 wt% anti-aging particles, which are obtained by mixing UV-994 and / or anti-aging additives.

[0026] By adopting the above technical solution, adding 3-8 wt% anti-aging particles can effectively improve the anti-aging performance of the waterproof membrane, reduce performance degradation under high temperature, high humidity and ultraviolet radiation environments, thereby improving the durability of the waterproof membrane. The anti-aging particles are composed of UV-994 and / or anti-aging additives, further enhancing the waterproof membrane's resistance to harsh environments and ensuring that it maintains good waterproof and mechanical properties during long-term use.

[0027] Preferably, the anti-aging additive is composed of anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin in the following weight ratios: (1-3):(2-5):(5-8):1.

[0028] By adopting the above technical solution, an anti-aging additive composed of anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin in a specific weight ratio can further improve the waterproof membrane's resistance to high temperature, high humidity, and UV environments. While maintaining excellent waterproof performance and mechanical properties, it significantly enhances its durability. Specific effects include: reducing performance degradation caused by aging during long-term use, strengthening the connection stability between different layers, and reducing the risk of interlayer cracking or delamination under high humidity and high temperature environments, thereby ensuring the comprehensive performance of the waterproof membrane under harsh conditions.

[0029] Specifically, PTW compatibilizer enhances the interfacial bonding between PP and PE, reducing phase separation between the two phases and providing a basis for the uniform dispersion of anhydride-modified PP, silicone PC, and boron-modified phenolic resin.

[0030] The organosilicon segments of silicone PC endow the composite membrane with low surface energy, reducing the initial adsorption of water molecules. The addition of boron-modified phenolic resin further strengthens the cross-linked network structure of the composite membrane, forming a multi-layered physical barrier and synergistically enhancing waterproof performance with silicone PC. Furthermore, silicone PC and boron-modified phenolic resin significantly improve the mechanical properties of the composite membrane, reducing the formation of microcracks caused by external forces, thereby lowering the risk of moisture penetration.

[0031] In summary, the combination of silicone PC and boron-modified phenolic resin has a synergistic effect, and with the synergistic effect of acid anhydride-modified PP and PTW compatibilizer, the material system is fully and uniformly mixed, thereby improving the overall performance of the waterproof membrane.

[0032] Secondly, a lightweight waterproof membrane is provided with PP nonwoven fabric, a first coating layer, PP woven fabric and a second coating layer sequentially arranged from the upper surface to the lower surface. The waterproof membrane is produced by a lightweight waterproof membrane manufacturing process.

[0033] The lightweight waterproof membrane obtained by adopting the above technical solution has the following effects:

[0034] 1. By optimizing the melting process of PE-PP composite material, the heating temperature is controlled at 295-305℃ and held at a constant temperature for 28-35 minutes to ensure that the material is fully melted and has good flow properties, thereby improving the uniformity of the first and second coating layers, enhancing the interlayer connection stability, and improving the overall waterproof performance and mechanical properties.

[0035] 2. By setting a specific weight ratio (first coating layer, second coating layer, PP woven fabric, PP nonwoven fabric is (10-20): (10-20): (50-60): 15), while ensuring lightweight, a stable combination of each layer structure is achieved, reducing the risk of aging or delamination in high humidity and high temperature environments;

[0036] 3. The screw temperature zoning setting and die temperature control in the extrusion process further improve coating uniformity and enhance the overall performance of the waterproof membrane;

[0037] 4. The weight ratio of PE to PP is 1:(2.5-3.5), and the limitation on the number-average molecular weight of PP and PE helps to improve the compatibility and mechanical properties of the materials;

[0038] 5. Adding anti-aging particles to PE-PP composites, especially anti-aging additives composed of acid anhydride modified PP, PTW compatibilizer, silicone PC, and boron modified phenolic resin, and blending them with UV-994, significantly improves the waterproof membrane's resistance to high temperature, high humidity, and UV environments, maintaining better waterproof performance and mechanical properties.

[0039] 6. Parameter optimization of PP non-woven fabric and PP woven fabric ensures the matching of substrate performance and coating performance, further improving the overall performance of the waterproof membrane.

[0040] The waterproof membrane produced by the manufacturing process described in this application has superior performance.

[0041] In summary, this application includes at least one of the following beneficial technical effects:

[0042] 1. By heating the PE-PP composite material to 295-305℃ and holding it at that temperature for 28-35 minutes, the material is fully melted and has good flow properties, which can be uniformly coated onto the surface of PP non-woven fabric and PP woven fabric to form a stable first coating layer and second coating layer, thereby improving the overall layer structure stability and waterproof performance of the waterproof membrane.

[0043] 2. By using a specific weight ratio of first coating layer, second coating layer, PP woven fabric and PP nonwoven fabric (1-3:1-3:10-14:3), the bonding stability between each layer is optimized while ensuring lightweight, reducing aging and delamination under high temperature and high humidity environments, and significantly improving the durability of the waterproof membrane.

[0044] 3. Use 4-8 kg / cm² during the pressing process. 2 The pressure and temperature of 280-305℃ promote tight adhesion between the layers of materials, further enhancing the mechanical properties and waterproofing effect of the waterproof membrane, while avoiding material damage or performance degradation caused by improper pressing parameters. Detailed Implementation

[0045] Silicon PC is silicon copolymer PC, and its manufacturer's model number is SABIC PC EXL1414T toughened grade.

[0046] PTW compatibilizer: DuPont ELvaloy PTW ethylene terpolymer;

[0047] Anhydride-modified PP manufacturer and model: DowDuPont 50E571;

[0048] The boron-modified phenolic resin is a boron-cashew oil-modified phenolic resin, and the preferred manufacturer is Jining Tangyi Chemical Co., Ltd., model 064.

[0049] Example

[0050] Example 1

[0051] 1) Heat the PE-PP composite material to 300℃ and hold it at that temperature for 30 minutes to obtain the molten material;

[0052] 2) The molten material is extruded and coated onto the surface of the PP nonwoven fabric to form the first coating layer that will be fully cured on the PP nonwoven fabric;

[0053] 3) Next, the PP woven fabric is bonded to the surface of the coating layer to be fully cured, and the molten material is extruded and coated onto the surface of the PP nonwoven fabric to form a second coating layer to be fully cured on the surface of the PP nonwoven fabric, thus obtaining a semi-finished product.

[0054] 4) Press the semi-finished products together and cool them until the first and second coating layers are completely cured and bonded to obtain a lightweight waterproof membrane;

[0055] In every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is 15:15:55:15; the pressing pressure during the pressing process is 7kg / cm. 2 The pressing temperature is 300℃.

[0056] The screw temperature settings for the extrusion process are: Zone 1 170℃, Zone 2 260℃, Zone 3 280℃, Zone 4 300℃, Zone 5 300℃, and the die temperature for the extrusion process is 300℃.

[0057] In PE-PP composite materials, the weight ratio of PE to PP is 1:2.5.

[0058] The number-average molecular weight of PP is 200,000; the number-average molecular weight of PE is 300,000.

[0059] PP nonwoven fabric is 15g / m 2 The PP fiber diameter is 3-5D and the length is 50-60mm; in this embodiment, it is 5D and the length is 51mm, and the PP woven fabric is 55g / m². 2 Monofilament 0.08mm; lightweight waterproof membrane products with a basis weight of 30-300g / m². 2 In this embodiment, the concentration is 100±1g / m³. 2 Since the actual weight is difficult to be very precise at a certain value, this application controls it to 100g / m³. 2 about.

[0060] Example 2

[0061] The difference between Example 2 and Example 1 lies in the process parameters, as detailed below:

[0062] In every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is 10:20:55:15.

[0063] The pressing pressure during the pressing process is 8 kg / cm². 2 The pressing temperature is 280℃.

[0064] The screw temperature settings for the extrusion process are: Zone 1 165℃, Zone 2 250℃, Zone 3 285℃, Zone 4 305℃, and Zone 5 305℃. The die temperature for the extrusion process is 295℃.

[0065] In PE-PP composite materials, the weight ratio of PE to PP is 1:2.5.

[0066] The number-average molecular weight of PP is 100,000; the number-average molecular weight of PE is 500,000.

[0067] The PP fiber has a diameter of 3D and a length of 60mm.

[0068] Example 3

[0069] The difference between Example 3 and Example 1 lies in the process parameters, as detailed below:

[0070] In every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is 20:10:55:15; the pressing pressure during the pressing process is 4kg / cm. 2 The pressing temperature is 305℃.

[0071] The screw temperature settings for the extrusion process are: Zone 1 175℃, Zone 2 270℃, Zone 3 275℃, Zone 4 295℃, and Zone 5 295℃. The die temperature for the extrusion process is 305℃.

[0072] In PE-PP composite materials, the weight ratio of PE to PP is 1:(2.5-3.5).

[0073] The number-average molecular weight of PP is 300,000; the number-average molecular weight of PE is 200,000.

[0074] The PP fiber has a diameter of 5D and a length of 50mm.

[0075] Example 4

[0076] The difference between Example 4 and Example 1 is that the PE-PP composite material also includes 0.3wt% anti-aging particles. For example, when using 99.7kg of PE-PP composite material, 0.3kg of anti-aging particles should be added. The anti-aging particles are UV-994.

[0077] Example 5

[0078] The difference between Example 5 and Example 1 is that the PE-PP composite material also includes 5.3 wt% anti-aging particles. For example, when using 94.7 kg of PE-PP composite material, 5.3 kg of anti-aging particles should be added. The anti-aging particles are anti-aging additives, which are composed of anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin in the following weight ratio of 1:2:5:1.

[0079] Example 6

[0080] The difference between Example 6 and Example 5 is that the anti-aging particles are obtained by mixing UV-994 and anti-aging additives in a weight ratio of 0.3:5.

[0081] Example 7

[0082] The difference between Example 7 and Example 6 is that the anti-aging additive is composed of anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin in the following weight ratio: 1:5:7:1.

[0083] Example 8

[0084] The difference between Example 8 and Example 6 is that the anti-aging additive is composed of anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin in the following weight ratio of 3:4:8:1.

[0085] Example 9

[0086] The difference between Example 9 and Example 6 is that the silicon PC is replaced with boron-modified phenolic resin in equal amounts.

[0087] Example 10

[0088] The difference between Example 10 and Example 6 is that the boron-modified phenolic resin is replaced with an equal amount of silicon PC.

[0089] Example 11

[0090] The difference between Example 11 and Example 6 is that the PTW compatible dose is replaced with anhydride-modified PP.

[0091] Comparative Example

[0092] Comparative Example 1

[0093] The difference between Comparative Example 1 and Example 1 is that the heating in step 1) is to 250°C.

[0094] Comparative Example 2

[0095] The difference between Comparative Example 2 and Example 1 is that the heating temperature in step 1) is 295°C, and then the temperature is kept constant for 5 minutes.

[0096] Comparative Example 3

[0097] The difference between Comparative Example 3 and Example 1 is that both Step 2 and Step 3 are fully cured first coating layers.

[0098] Comparative Example 4

[0099] The difference between Comparative Example 4 and Example 1 is that the pressing temperature in step 4) is 250°C.

[0100] Comparative Example 5

[0101] The difference between Comparative Example 5 and Example 1 is that the amount of the first and second coating layers is smaller. For example, in every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is 5:5:55:35, where the PP nonwoven fabric is 35g / m². 2 PP woven fabric is 45g / m² 2 .

[0102] Comparative Example 6

[0103] The difference between Comparative Example 6 and Example 1 is that the amount of the first and second coating layers is smaller. For example, in every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is 30:30:25:15, where the PP nonwoven fabric is 25g / m². 2 PP woven fabric is 15g / m 2 .

[0104] Performance testing

[0105] Test method / test method for water resistance performance: ISO 15106-3:2003 (plastics. films and sheets. determination of water vapor transmission rate) Part 3: electrolytic detection sensor method, to test water vapor transmission rate.

[0106] Mechanical properties: Refer to GB / T 23457-2017 to test the maximum tensile force in the longitudinal and transverse directions, and take their average value.

[0107] Anti-aging test: Place the sample in an experimental test chamber and test it for 1000 hours at a temperature of 85℃, humidity of 85%, and ultraviolet light intensity [lamp UVA-340nm, power of 0.63W / (m2·nm)]. First, check whether there is delamination in the layer structure of the sample. If there is no delamination, then test the waterproof performance and tensile strength.

[0108] The specific experimental data are shown in Table 1.

[0109] Table 1. Experimental data of Examples 1-11 and Comparative Examples 1-6

[0110]

[0111]

[0112] Combining Example 1 and Comparative Examples 1-5 with Table 1, it can be seen that the average maximum pressure of Comparative Examples 1-5 is lower than that of Example 1. Furthermore, the increase in water vapor transmission rate and the decrease in average maximum tensile strength of Comparative Examples 1-5 after aging are greater than those of Example 1. This indicates that by heating at 295-305℃ and holding the temperature for 28-35 minutes in step 1) of this application, compared to heating to 250℃ and holding the temperature for 10 minutes, the PE-PP composite material can be fully melted and has better flow properties. This facilitates uniform coating onto the surface of PP nonwoven fabric and PP woven fabric, forming a uniform first and second coating layer. This ensures the connection stability of the layer structure in each area of ​​the waterproof membrane, improves the overall layer structure stability, and further enhances the waterproof performance and mechanical properties. Simultaneously, under long-term high temperature and high humidity conditions, it reduces the occurrence of layer structure cracking, thus improving the durability of the waterproof membrane.

[0113] However, when the heating temperature is too high, such as above 305°C, the temperature is difficult to control, the processing cost is high, and the material begins to decompose.

[0114] In Comparative Example 3, steps 2 and 3 are both fully cured first coating layers. At this time, the adhesion between the first coating layer and the PP woven fabric is reduced. Even if hot pressing is performed later, it is difficult to ensure stable adhesion between the first coating layer and the PP woven fabric. As a result, the overall physical properties are reduced. Therefore, under high humidity, high temperature and UV conditions, the membrane structure is prone to delamination.

[0115] In Comparative Example 4, the pressing temperature in step 4) is only 250°C. At this temperature, the mechanical and waterproof properties are lower than those obtained in Example 1 using 295°C. This indicates that using the pressing process parameters of this application can promote the connection stability of the waterproof membrane structure, improve its waterproof and mechanical properties, and reduce the phenomenon of loosening and delamination of the layer structure under long-term high temperature and high humidity, which would otherwise lead to a decrease in waterproof and mechanical properties. When the pressing temperature is too high, it can also easily cause the material to mature or stick to the pressing machine.

[0116] In Comparative Example 5, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric in every 100g of waterproof membrane is 1:1:20:5. Compared with the method used in this application, the amount of the first and second coating layers is reduced, indicating that within the dosage range of this application, the connection between each layer structure can be stabilized, reducing aging and layer peeling under high humidity and high temperature, and improving durability. However, when the amount of the first and second coating layers is large and the amount of PP woven fabric is small, such as in Comparative Example 6 compared to Example 1, the waterproof performance of Comparative Example 6 is improved, but the overall average maximum tensile strength is significantly reduced, making it prone to tearing during use.

[0117] Comparing Example 1 and Example 4, Example 1 shows a greater increase in water vapor transmission rate and water vapor transmission rate after aging, as well as a greater decrease in average maximum tensile strength than Example 4. This indicates that the addition of anti-aging particles effectively improves the anti-aging effect, reduces the occurrence of aging properties, and improves durability.

[0118] When anti-aging additives and UV-994 are used together, the waterproof membrane's resistance to high temperature, high humidity, and UV environments can be further improved, allowing it to maintain better waterproof and mechanical properties.

[0119] Compared with Example 6, Examples 1, 5, and 9-11 show that Example 6 exhibits a smaller increase in water vapor permeability and a smaller decrease in average maximum pressure. Furthermore, Example 6 has a higher average maximum tensile strength and a lower water vapor permeability, indicating that the waterproof membrane obtained in these examples has better resistance. This further demonstrates that the anti-aging additive, obtained by compounding anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin, further improves waterproof performance, mechanical properties, and maintains better performance after being blended with UV-994.

[0120] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A manufacturing process for a lightweight waterproof membrane, characterized in that, It is prepared by the following method: 1) Heat the PE-PP composite material to 295-305℃, then keep it at that temperature for 28-35 minutes to obtain the molten material; 2) The molten material is extruded and coated onto the surface of the PP nonwoven fabric to form the first coating layer to be fully cured on the PP nonwoven fabric; 3) Next, the PP woven fabric is bonded to the surface of the coating layer to be fully cured, and then the molten material is extruded and coated onto the surface of the PP woven fabric to form a second coating layer to be fully cured on the surface of the PP woven fabric, thus obtaining a semi-finished product; 4) Press the semi-finished products together and cool them until the first and second coating layers are completely cured and bonded to obtain a lightweight waterproof membrane; In every 100g of waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP nonwoven fabric is (10-20):(10-20):(50-60):15; the pressing pressure during the pressing process is 4-8kg / cm. 2 The pressing temperature is 280-305℃; The PE-PP composite material also includes 3-8 wt% anti-aging particles, which are obtained by mixing UV-994 and anti-aging additives; the anti-aging additives are composed of anhydride modified PP, PTW compatibilizer, silicone PC, and boron modified phenolic resin in the following weight ratio (1-3):(2-5):(5-8):

1.

2. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that, The screw temperature in the extrusion process is set as follows: Zone 1 165-175℃, Zone 2 250-270℃, Zone 3 275-285℃, Zone 4 295-305℃, and Zone 5 295-305℃. The die temperature in the extrusion process is 295-305℃.

3. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that: In the PE-PP composite material, the weight ratio of PE to PP is 1:(2.5-3.5).

4. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that, The specific process in step 1) is as follows: heat the PE-PP composite material for 85-95 minutes to raise its temperature to 295-305℃, and then keep it at a constant temperature for 28-35 minutes to obtain the molten material.

5. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that: The number-average molecular weight of the PP is 100,000 to 300,000.

6. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that: The number-average molecular weight of the PE is 200,000 to 500,000.

7. The manufacturing process of a lightweight waterproof membrane according to claim 1, characterized in that: The PP nonwoven fabric has a strength of 10-100g / m². 2 The PP fiber diameter is 3-5D and the length is 50-60mm; the PP woven fabric has a weight of 30-120g / m². 2 .

8. A lightweight waterproof membrane, characterized in that: The waterproof membrane is provided with PP nonwoven fabric, a first coating layer, PP woven fabric and a second coating layer in sequence from the top surface to the bottom surface. The waterproof membrane is made by the manufacturing process of a lightweight waterproof membrane as described in any one of claims 1-7.

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