Production process of lightweight waterproof membrane and prepared waterproof membrane

Abstract

The invention relates to the field of waterproof membranes, in particular to a production process of a lightweight waterproof membrane and the prepared waterproof membrane. The preparation method comprises the following steps: 1) heating a PE-PP composite material to 295-305 DEG C, and keeping the temperature constant for 28-35 minutes to obtain a molten material; (2) feeding and discharging the molten material, extruding and laminating on the surface of the PP non-woven fabric, and forming a first laminating layer to be completely cured on the PP non-woven fabric; (3) the PP woven cloth is attached to the surface of the to-be-completely-cured lamination layer, the molten material is extruded and laminated on the surface of the PP non-woven fabric, a to-be-completely-cured second lamination layer is formed on the surface of the PP non-woven fabric, and a semi-finished product is obtained; and 4) pressing the semi-finished product, and cooling until the first lamination layer and the second lamination layer are completely cured and bonded to obtain the light-weight waterproof membrane.The waterproof membrane obtained by the process has better light weight, waterproofness and mechanical properties.

Description

Technical Field

[0001] The present application relates to the field of waterproof membranes, and more specifically, to a production process of a lightweight waterproof membrane and the obtained waterproof membrane. Background Art

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

[0003] In the prior art, to solve the waterproof performance and mechanical properties of waterproof membranes, multi-layer composite structures are usually used for treatment. For example, different material fabric layers are combined with the waterproof layer through adhesives, or multiple layers of materials are laminated together through hot pressing or other methods. In addition, there are methods to improve the performance of waterproof membranes by changing the material ratio or adding functional additives. These means mainly include: using multi-layer structures such as polypropylene non-woven fabric and ethylene woven fabric in combination, connecting each layer through adhesives; adjusting the proportion of each layer of material, such as increasing the thickness of the waterproof layer; and adding auxiliary components such as inorganic fillers to the material.

[0004] However, the above conventional means have obvious defects: although 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 unstable interlayer bonding, especially in high-temperature and high-humidity environments, where cracking or delamination is likely to occur, thus reducing the waterproof effect and mechanical properties. Therefore, there is an urgent need for a solution that can maintain lightweight while improving waterproofness and mechanical properties. Summary of the Invention

[0005] In order to maintain lightweight while improving waterproofness and mechanical properties, the present application provides a production process of a lightweight waterproof membrane and the obtained waterproof membrane.

[0006] In a first aspect, the present application provides a production process of a lightweight waterproof membrane, which is obtained by the following method: 1) Heat the PE-PP composite material to 295 - 305 °C, and then keep it at a constant temperature for 28 - 35 minutes to obtain a molten material; 2) Extrude and apply the molten material onto the surface of the PP non-woven fabric to form a first coating layer to be completely cured on the PP non-woven fabric; 3) Then laminate the PP woven fabric onto the surface of the coating layer to be completely cured, and then extrude and apply the molten material onto the surface of the PP non-woven fabric to form a second coating layer to be completely cured on the surface of the PP non-woven fabric to obtain a semi-finished product; 4) Press the semi-finished product and cool it until the first coating layer and the second coating layer are completely cured and adhered to obtain a lightweight waterproof film; In every 100 g of the waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is (10 - 20) : (10 - 20) : (50 - 60) : 15; the pressing pressure during the pressing process is 4 - 8 kg / cm 2 , and the pressing temperature is 280 - 305 °C.

[0007] By adopting the above technical solutions, this production process can prepare a lightweight waterproof film with excellent waterproof performance and mechanical properties. The specific effects are as follows: First, through precise heating and constant temperature treatment of the PE-PP composite material, it ensures that the material is fully melted, thereby improving the uniformity during the subsequent coating process and further enhancing the waterproof performance. Second, by controlling the weight ratio among the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric, the connection stability of each layer structure is optimized, enabling the overall performance of the waterproof film to be significantly improved while ensuring lightweight. Finally, under specific pressing pressure and temperature conditions, the pressing treatment further strengthens the bonding strength between layers, effectively preventing problems such as delamination or cracking under harsh environments such as high temperature and high humidity, thus greatly improving the durability and comprehensive performance of the waterproof film.

[0008] Preferably, the screw temperature during the extrusion process is set as follows: Zone 1: 165 - 175 °C, Zone 2: 250 - 270 °C, Zone 3: 275 - 285 °C, Zone 4: 295 - 305 °C, Zone 5: 295 - 305 °C, and the die temperature during the extrusion process is 295 - 305 °C.

[0009] By adopting the above technical solutions, through precise control of the temperatures of each zone of the screw and the die temperature during the extrusion process, it can ensure the melting state and fluidity of the PE-PP composite material at different stages, thereby improving the uniformity and stability of the coating. Specifically, the temperature gradient design from Zone 1 to Zone 5 helps the material to be gradually melted and fully plasticized, and the setting of the die temperature ensures the stability and coating performance of the molten material during extrusion, further enhancing the bonding strength between layers and the overall performance of the waterproof film.

[0010] Preferably, in the PE-PP composite material, the weight ratio of PE to PP is 1 : (2.5 - 3.5).

[0011] By adopting the above technical solution, the weight ratio of PE to PP is set to 1:(2.5 - 3.5), enabling the PE-PP composite material to have better fluidity and uniformity in the molten state. As a result, during the film laminating process, it can be better coated on the surfaces of PP non-woven fabric and PP woven fabric, forming uniform first and second film laminating layers. This ratio optimizes the bonding force between layers, improves the overall waterproof performance and mechanical properties of the waterproof film, and simultaneously reduces the phenomena of interlayer cracking or separation caused by improper material ratio, further enhancing the durability and stability of the waterproof film.

[0012] Preferably, the specific process in step 1) is as follows: The PE-PP composite material is heated for 85 - 95 min to raise its temperature to 295 - 305 °C, and then kept at a constant temperature for 28 - 35 min to obtain a molten material.

[0013] By adopting the above technical solution, after the PE-PP composite material is heated for 85 - 95 min and the temperature is raised to 295 - 305 °C, and then kept at a constant temperature for 28 - 35 min, it can ensure that the composite material is fully melted and has good fluidity. This process condition helps to improve the uniformity of the molten material, making it easier to be film laminated on the surfaces of PP non-woven fabric and PP woven fabric, forming first and second film laminating layers with uniform thickness. The uniform film laminating layers can enhance the connection stability of the layer structures in each area of the waterproof film, thereby improving the overall waterproof performance and mechanical properties. At the same time, this process parameter can also reduce the phenomena such as layer structure cracking in the long-term high-temperature and high-humidity environment, improving the durability of the waterproof film.

[0014] Preferably, the number-average molecular weight of the PP is 100,000 - 300,000.

[0015] By adopting the above technical solution, the number-average molecular weight of the PP is limited to 100,000 - 300,000, which can optimize the melting performance and fluidity of the PE-PP composite material, making the molten material more easily and uniformly coated on the surfaces of PP non-woven fabric and PP woven fabric during the film laminating process, thus forming first and second film laminating layers with uniform thickness. This not only improves the bonding stability between the layers of the waterproof film, but also further enhances the overall waterproof performance and mechanical properties of the waterproof film. In addition, during long-term use, the PP within this molecular weight range helps to reduce the interlayer cracking phenomenon and improve the durability of the waterproof film.

[0016] Preferably, the number-average molecular weight of the PE is 200,000 - 500,000.

[0017] By adopting the above technical solution, the number-average molecular weight of the PE is controlled to be 200,000 - 500,000, which can optimize the performance of the PE material, making it have better fluidity and coating uniformity in the molten state, thereby improving the formation quality of the first coating layer and the second coating layer. This helps to enhance the bonding stability between the layers of the waterproof membrane, further improving the waterproof performance and mechanical properties, while reducing problems such as layer structure cracking in high-humidity and high-temperature environments, and improving the overall durability of the waterproof membrane.

[0018] Preferably, the PP non-woven fabric is 10 - 100 g / m 2 , the PP fiber has a linear diameter of 3 - 5 D and a length of 50 - 60 mm; the PP woven fabric is 30 - 120 g / m 2 .

[0019] By adopting the above technical solution, the gram weight of the PP non-woven fabric is set to 10 - 100 g / m 2 , the fiber linear diameter is 3 - 5 D and the length is 50 - 60 mm, which can ensure that the PP non-woven fabric has good air permeability and structural stability, and at the same time forms a tighter bond with the first coating layer and the second coating layer, improving the overall performance of the waterproof membrane. In addition, the gram weight of the PP woven fabric is set to 30 - 120 g / m 2 , while ensuring light weight, further enhancing the mechanical properties of the waterproof membrane and reducing the risk of aging or delamination in high-humidity and high-temperature environments.

[0020] Preferably, the PE-PP composite material further includes 3 - 8 wt% anti-aging particles, and the anti-aging particles are obtained by mixing UV-994 and / or anti-aging additives.

[0021] By adopting the above technical solution, adding 3 - 8 wt% of anti-aging particles can effectively improve the anti-aging performance of the waterproof membrane, reduce the performance attenuation in high-temperature, high-humidity and ultraviolet environments, thereby enhancing the durability of the waterproof membrane. Among them, the anti-aging particles are composed of UV-994 and / or anti-aging additives, further enhancing the tolerance of the waterproof membrane to harsh environments and ensuring that it maintains good waterproof performance and mechanical properties during long-term use.

[0022] Preferably, the anti-aging additive is composed of acid anhydride-modified PP, PTW compatibilizer, silicon PC, and boron-modified phenolic resin in the following weight ratio of (1 - 3) : (2 - 5) : (5 - 8) : 1.

[0023] By adopting the above technical solution, the anti-aging aid composed of acid anhydride-modified PP, PTW compatibilizer, silicone PC, and boron-modified phenolic resin compounded according to a specific weight ratio can further improve the tolerance of the waterproof membrane to high temperature, high humidity, and UV environment, and significantly enhance its durability while maintaining good waterproof performance and mechanical properties. The specific effects include: reducing the performance degradation of the waterproof membrane caused by aging during long-term use, enhancing the connection stability between layers, reducing the risk of interlayer cracking or delamination in high humidity and high temperature environments, and thus ensuring the comprehensive performance of the waterproof membrane under harsh conditions.

[0024] Specifically, the PTW compatibilizer provides a basis for the uniform dispersion of acid anhydride-modified PP, silicone PC, and boron-modified phenolic resin by enhancing the interfacial bonding force between PP and PE and reducing the phase separation between the two phases.

[0025] The silicone chain segment of silicone PC endows the composite membrane with low surface energy characteristics, 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, forms a multi-layer physical barrier, and synergistically improves the waterproof performance with silicone PC. Moreover, silicone PC and boron-modified phenolic resin significantly improve the mechanical properties of the composite membrane, reduce the formation of microcracks caused by external forces, and thus reduce the risk of water penetration.

[0026] In summary, the compounding of silicone PC and boron-modified phenolic resin plays a synergistic role, and under the synergistic action of acid anhydride-modified PP and PTW compatibilizer, the material system is fully mixed and homogenized, improving the overall performance of the waterproof membrane.

[0027] In the second aspect, a lightweight waterproof membrane is provided, which is sequentially provided with a PP non-woven fabric, a first coating layer, a PP woven fabric, and a second coating layer from the upper surface to the lower surface, and the waterproof membrane is prepared by a production process of a lightweight waterproof membrane.

[0028] By adopting the above technical solution, the obtained lightweight waterproof membrane has the following effects: 1. By optimizing the melting process of the PE-PP composite material, the heating temperature is controlled at 295-305 °C and kept constant for 28-35 min, ensuring that the material is fully melted and has good fluidity, thereby improving the uniformity of the first coating layer and the second coating layer, enhancing the interlayer connection stability, and improving the overall waterproof performance and mechanical properties; 2. By setting a specific weight ratio ((10-20):(10-20):(50-60):15 for the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric), while ensuring lightweight, the stable combination of each layer structure is achieved, reducing the risk of aging or delamination in high humidity and high temperature environments; 3. The setting of the screw temperature zone and the die orifice temperature control during the extrusion process further improve the coating uniformity and enhance the comprehensive performance of the waterproof membrane. 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 material; 5. Adding anti-aging particles to the PE-PP composite material, especially using the anti-aging agent compounded by anhydride-modified PP, PTW compatibilizer, silicon PC, and boron-modified phenolic resin blended with UV-994, significantly improves the tolerance of the waterproof membrane in high-temperature, high-humidity, and UV environments, and maintains better waterproof performance and mechanical properties; 6. Optimizing the parameters of PP non-woven fabric and PP woven fabric to ensure the matching of the substrate performance and the coating performance, and further improving the overall performance of the waterproof membrane.

[0029] The waterproof membrane produced by the production process of this application has better performance.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. By heating the PE-PP composite material to 295 - 305 °C and maintaining a constant temperature for 28 - 35 min, the material is fully melted and has better flow performance, and can be uniformly coated on the surfaces of PP non-woven fabric and PP woven fabric to form stable first and second coating layers, thereby improving the overall layer structure stability and waterproof performance of the waterproof membrane; 2. Using the first coating layer, the second coating layer, PP woven fabric, and PP non-woven fabric with a specific weight ratio (1 - 3:1 - 3:10 - 14:3), while ensuring lightweight, optimizing the bonding stability between layers, reducing aging and delamination phenomena in high-temperature and high-humidity environments, and significantly improving the durability of the waterproof membrane; 3. During the pressing process, a pressure of 4 - 8 kg / cm 2 and a temperature of 280 - 305 °C are used to promote the tight bonding between the materials of each layer, further enhancing the mechanical properties and waterproof effect of the waterproof membrane, and at the same time avoiding material damage or performance degradation caused by improper pressing parameters. Detailed implementation method

[0031] Silicon PC is silicon copolymerized PC, and its manufacturer model is Sabic PC EXL1414T toughened grade of Sabic; PTW compatibilizer is DuPont ELvaloy PTW ethylene terpolymer; The manufacturer model of anhydride-modified PP is DowDuPont 50E571; The boron-modified phenolic resin is boron-cashew oil double-modified phenolic resin, and the manufacturer is preferably Jining Tangyi Chemical Co., Ltd., model 064. Example

[0032] Example 1 1) Heat the PE-PP composite material to 300 °C and then keep it at a constant temperature for 30 minutes to obtain a molten material; 2) Extrude and apply the molten material onto the surface of the PP non-woven fabric to form a first coating layer to be fully cured on the PP non-woven fabric; 3) Then laminate the PP woven fabric onto the surface of the coating layer to be fully cured, and then extrude and apply the molten material onto the surface of the PP non-woven fabric to form a second coating layer to be fully cured on the surface of the PP non-woven fabric, obtaining a semi-finished product; 4) Press the semi-finished product and cool it until the first coating layer and the second coating layer are fully cured and bonded to obtain a lightweight waterproof membrane; In every 100 g of the waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 15:15:55:15; the pressing pressure during the pressing process is 7 kg / cm 2 , and the pressing temperature is 300 °C.

[0033] The screw temperature during the extrusion process is set as follows: zone 1 is 170 °C, zone 2 is 260 °C, zone 3 is 280 °C, zone 4 is 300 °C, zone 5 is 300 °C, and the die temperature during the extrusion process is 300 °C.

[0034] In the PE-PP composite material, the weight ratio of PE to PP is 1:2.5.

[0035] The number-average molecular weight of PP is 200,000; the number-average molecular weight of PE is 300,000.

[0036] The PP non-woven fabric is 15 g / m 2 , the PP fiber linear density is 3 - 5 D and the length is 50 - 60 mm; in this embodiment, it is 5 D and the length is 51 mm, and the PP woven fabric is 55 g / m 2 , the monofilament is 0.08 mm; the gram weight of the lightweight waterproof membrane product is 30 - 300 g / m 2 , in this embodiment, it is 100 ± 1 g / m 2 , it is difficult for the actual gram weight to be very accurate at a certain value, and in this application, it is controlled at 100 g / m 2 or so.

[0037] Example 2 The difference between Example 2 and Example 1 lies in: different process parameters, specifically as follows: In every 100 g of the waterproof membrane, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 10:20:55:15.

[0038] The pressing pressure during the pressing process is 8 kg / cm 2 , and the pressing temperature is 280 °C.

[0039] The screw temperatures during the extrusion process are set as follows: Zone 1 at 165°C, Zone 2 at 250°C, Zone 3 at 285°C, Zone 4 at 305°C, Zone 5 at 305°C, and the die temperatures during the extrusion process are all 295°C.

[0040] In the PE-PP composite, the weight ratio of PE to PP is 1:2.5.

[0041] The number-average molecular weight of PP is 100,000; the number-average molecular weight of PE is 500,000.

[0042] The PP fiber has a linear diameter of 3D and a length of 60 mm.

[0043] Example 3 The difference between Example 3 and Example 1 lies in: different process parameters, specifically as follows: In every 100 g of the waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 20:10:55:15; the pressing pressure during the pressing process is 4 kg / cm 2 , and the pressing temperature is 305°C.

[0044] The screw temperatures during the extrusion process are set as follows: Zone 1 at 175°C, Zone 2 at 270°C, Zone 3 at 275°C, Zone 4 at 295°C, Zone 5 at 295°C, and the die temperatures during the extrusion process are all 305°C.

[0045] In the PE-PP composite, the weight ratio of PE to PP is 1:(2.5 - 3.5).

[0046] The number-average molecular weight of PP is 300,000; the number-average molecular weight of PE is 200,000.

[0047] The PP fiber has a linear diameter of 5D and a length of 50 mm.

[0048] Example 4 The difference between Example 4 and Example 1 lies in: the PE-PP composite also includes 0.3 wt% anti-aging particles. For example, when using 99.7 kg of the PE-PP composite, 0.3 kg of anti-aging particles need to be added, and the anti-aging particles are UV-994.

[0049] Example 5 The difference between Example 5 and Example 1 lies in: the PE-PP composite also includes 5.3 wt% anti-aging particles. For example, when using 94.7 kg of the PE-PP composite, 5.3 kg of anti-aging particles need to be added, and the anti-aging particles are anti-aging additives, and the anti-aging additives are composed of acid anhydride-modified PP, PTW compatibilizer, silicon PC, and boron-modified phenolic resin in the following weight ratio of 1:2:5:1.

[0050] Example 6 Example 6 is different from Example 5 in that the anti-aging particles are obtained by mixing UV-994 and an anti-aging aid in a weight ratio of 0.3:5.

[0051] Example 7 Example 7 is different from Example 6 in that the anti-aging aid consists of maleic anhydride modified PP, PTW compatibilizer, silicone PC, and boron modified phenolic resin in the following weight ratio of 1:5:7:1.

[0052] Example 8 Example 8 is different from Example 6 in that the anti-aging aid consists of maleic anhydride modified PP, PTW compatibilizer, silicone PC, and boron modified phenolic resin in the following weight ratio of 3:4:8:1.

[0053] Example 9 Example 9 is different from Example 6 in that silicone PC is replaced with boron modified phenolic resin in equal amounts.

[0054] Example 10 Example 10 is different from Example 6 in that boron modified phenolic resin is replaced with silicone PC in equal amounts.

[0055] Example 11 Example 11 is different from Example 6 in that the amount of PTW compatibilizer is replaced with maleic anhydride modified PP.

[0056] Comparative Example Comparative Example 1 Comparative Example 1 is different from Example 1 in that in step 1), it is heated to 250 °C.

[0057] Comparative Example 2 Comparative Example 2 is different from Example 1 in that in step 1), the heating temperature is 295 °C and then held at a constant temperature for 5 min.

[0058] Comparative Example 3 Comparative Example 3 is different from Example 1 in that both step 2 and step 3 are a completely cured first coating layer.

[0059] Comparative Example 4 Comparative Example 4 is different from Example 1 in that in step 4), the lamination temperature is 250 °C.

[0060] Comparative Example 5 Comparative Example 5 is different from Example 1 in that the amounts of the first coating layer and the second coating layer are less. For example, in every 100 g of the waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 5:5:55:35, where the PP non-woven fabric is 35 g / m 2 , and the PP woven fabric is 45 g / m 2。

[0061] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that the amounts of the first coating layer and the second coating layer are less. For example, in every 100 g of the waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 30:30:25:15, where the PP non-woven fabric is 25 g / m 2 , and the PP woven fabric is 15 g / m 2 。

[0062] Performance detection test Detection method / Test method Waterproof performance: ISO 15106-3:2003 (Plastics - Films and sheeting - Determination of water vapour transmission rate) Part 3: Electrolytic detection sensor method, to test the water vapour transmission rate.

[0063] Mechanical properties: Refer to GB / T 23457-2017 to detect the maximum tensile force in the longitudinal and transverse directions and take the average value.

[0064] Anti-aging test: Put it into an experimental test chamber and conduct the test for 1000 h at a temperature of 85 °C, a humidity of 85%, and an ultraviolet light intensity [lamp UVA-340 nm, power 0.63 W / (m2·nm)]. First, check whether there is delamination in the layer structure of the sample. For those without delamination, then detect the waterproof performance and tensile force.

[0065] The above experimental data are specifically shown in Table 1; Table 1 Experimental data of Examples 1-11 and Comparative Examples 1-6 Combining Example 1 and Comparative Examples 1-5 and combining with Table 1, it can be seen that the average maximum pressure of Comparative Examples 1-5 is lower than that of Example 1, and the improvement amplitude of the water vapour transmission rate and the water vapour transmission rate after aging, as well as the reduction amplitude of the average maximum tensile force of Comparative Examples 1-5 are all larger than those of Example 1. It shows that in the heating temperature of 295-305 °C and the constant temperature of 28-35 min in step 1) of the present application, compared with heating to 250 °C and the constant temperature time of 10 min, the PE-PP composite material can be fully melted and has better flowability, and then it is easy to uniformly coat on the surfaces of the PP non-woven fabric and the PP woven fabric to form a uniform first coating layer and a second coating layer, ensuring the connection stability of the layer structure in each region of each waterproof film, improving the overall layer structure stability, and further improving the waterproof performance and mechanical properties. At the same time, when being in high temperature, high humidity, etc. for a long time, the phenomenon of layer structure cracking is reduced, and the durability of the waterproof film is improved.

[0066] When the heating temperature is too high, such as higher than 305 °C, the temperature is difficult to control, the processing cost is high, and at the same time, the material begins to decompose.

[0067] In Comparative Example 3, both Step 2 and Step 3 are fully cured first coating layers. At this time, the bonding force between the first coating layer and the PP woven fabric is reduced. Even if hot pressing is carried out later, it is very difficult to ensure the stable bonding between the first coating layer and the PP woven fabric. Therefore, the overall physical properties are reduced. Therefore, when under high humidity, high temperature, and UV, the film structure is prone to delamination.

[0068] The pressing temperature in Step 4) of Comparative Example 4 is only 250 °C. At this temperature, the mechanical properties and waterproof properties are lower than those of Example 1 using 295 °C. It shows that adopting the pressing process parameters of the present application can promote the connection stability of the waterproof film layer structure, improve its waterproof properties and mechanical properties, and reduce the phenomenon of loosening and delamination of the layer structure under high temperature and high humidity for a long time, resulting in a decrease in waterproof properties and mechanical properties. When the pressing temperature is too high, it is also easy to cause the material to be cooked or stick to the press.

[0069] In Comparative Example 5, in every 100 g of the waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is 1:1:20:5. Compared with the present application, the amounts of the first coating layer and the second coating layer are reduced, indicating that within the dosage range of the present application, the connection of each layer structure can be made stable, and the phenomena of aging and layer peeling can be reduced under high humidity and high temperature, improving the durability. When the amounts of the first coating layer and the second coating layer are relatively large and the amount of the PP woven fabric is relatively small, such as comparing Comparative Example 6 with Example 1, the waterproof performance of Comparative Example 6 is improved, but the overall average maximum tensile force is significantly reduced, and tearing and other phenomena are prone to occur during use.

[0070] Comparing Example 1 and Example 4, the improvement amplitude of the water vapor transmission rate and the water vapor transmission rate after aging and the reduction amplitude of the average maximum tensile force in Example 1 are both larger than those in Example 4, indicating that adding anti-aging particles can effectively improve the anti-aging effect, reduce its aging performance, and improve the durability.

[0071] When the anti-aging additive and UV-994 are used in combination, the tolerance of the waterproof film to high temperature, high humidity, UV environment, etc. can be further improved, and it can maintain better waterproof properties and mechanical properties.

[0072] Compared with Example 1, Example 5, Examples 9 - 11 and Example 6, the improvement amplitude of the water vapor transmission rate and the reduction amplitude of the average maximum pressure in Example 6 are relatively small. Moreover, Example 6 has a relatively high average maximum tensile force and a relatively low water vapor transmission rate, indicating that the waterproof film obtained in the example has better tolerance. Furthermore, it shows that the anti-aging aid obtained by compounding anhydride-modified PP, PTW compatibilizer, silicon PC, and boron-modified phenolic resin, after being blended with UV-994, further improves the waterproof performance, mechanical properties, and maintains better performance.

[0073] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A production process for a lightweight waterproof membrane, characterized in that: Prepared by the following method: 1) Heat the PE-PP compound to 295-305°C and keep the temperature constant for 28-35 minutes to obtain a molten material; 2) Extruding and coating the molten material on the surface of the PP non-woven fabric to form a first coating layer to be fully cured on the PP non-woven fabric; 3) The PP woven fabric is then laminated to the surface of the coating layer to be fully cured, and the molten material is extruded and coated on the surface of the PP non-woven fabric to form a second coating layer to be fully cured on the surface of the PP non-woven fabric to obtain a semi-finished product; 4) Press the semi-finished product together and cool it until the first coating layer and the second coating layer are completely solidified and bonded to obtain a lightweight waterproof membrane; In every 100g of waterproof film, the weight ratio of the first coating layer, the second coating layer, the PP woven fabric, and the PP non-woven fabric is (10-20): (10-20): (50-60): 15; the lamination pressure of the lamination process is 4-8kg / cm 2 , the pressing temperature is 280-305℃.

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

3. The production 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 production process of a lightweight waterproof membrane according to claim 1, characterized in that: The specific process in step 1) is as follows: the PE-PP composite material is heated for 85-95 minutes to raise its temperature to 295-305° C., and then kept at the constant temperature for 28-35 minutes to obtain a molten material.

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

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

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

8. The production process of a lightweight waterproof membrane according to claim 1, characterized in that: The PE-PP composite material also includes 3-8wt% of anti-aging particles, and the anti-aging particles are obtained by mixing UV-994 and / or anti-aging additives.

9. The production process of a lightweight waterproof membrane according to claim 8, characterized in that: The anti-aging additive is composed of anhydride modified PP, PTW compatibilizer, silicon PC, and boron modified phenolic resin in the following weight ratio: (1-3): (2-5): (5-8):

1.

10. A lightweight waterproof membrane, characterized in that: A PP non-woven fabric, a first coating layer, a PP woven fabric, and a second coating layer are sequentially arranged from the upper surface to the lower surface. The waterproof membrane is produced by the production process of a lightweight waterproof membrane according to any one of claims 1 to 9.

Images