Multi-channel composite polyethylene polypropylene fiber waterproof coiled material and preparation method thereof

Abstract

The invention relates to the technical field of waterproof coiled materials, and provides a multi-channel composite polyethylene polypropylene fiber waterproof coiled material and a preparation method thereof. A multi-channel composite polyethylene polypropylene fiber waterproof coiled material is composed of two or more polyethylene polypropylene fiber waterproof coiled materials, and each polyethylene polypropylene fiber waterproof coiled material is formed by compounding a polyethylene sheet layer and polypropylene fiber cloth. The polyethylene sheet layer comprises the following raw materials in parts by weight: polyethylene, polyvinyl alcohol fibers, an antioxidant, an ultraviolet light absorber, a lubricant and a plasticizer, the polyvinyl alcohol fibers are composed of first polyvinyl alcohol fibers and second polyvinyl alcohol fibers, and the first polyvinyl alcohol fibers and the second polyvinyl alcohol fibers are different in linear density. According to the technical scheme, the problems of low waterproof performance and low mechanical strength of the waterproof roll in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coiled materials, and in particular to a multi-channel composite polyethylene polypropylene waterproof coiled material and a preparation method thereof. Background Art

[0002] In the field of construction and civil engineering, waterproofing membranes play a key role in ensuring the waterproofing and anti-leakage of buildings, and their performance is directly related to the service life and use function of the building. Traditional waterproofing membranes, such as asphalt-based waterproofing membranes, are widely used, but they have disadvantages such as easy aging, poor durability, and high environmental pollution during construction. Polyvinyl chloride waterproofing membranes have also exposed problems such as poor weather resistance and easy deformation in long-term use, making it difficult to meet the increasingly stringent performance and environmental requirements of modern buildings for waterproof layers.

[0003] Polyethylene polypropylene waterproofing membrane stands out among many waterproofing membranes due to its excellent weather resistance, corrosion resistance, good mechanical properties, and relatively low cost, becoming a representative material with broad application prospects. However, with the continuous development of construction technology and the gradual improvement of waterproofing requirements, the waterproof performance and mechanical strength of a single-layer polyethylene polypropylene waterproof layer are still limited when facing some special environments or projects with high waterproofing requirements. Therefore, it is necessary to develop a multi-layer composite polyethylene polypropylene waterproofing membrane with high waterproof performance and high mechanical strength. Summary of the invention

[0004] The invention provides a multi-layer composite polyethylene polypropylene waterproof coiled material and a preparation method thereof, which solves the problems of low waterproof performance and low mechanical strength of the waterproof coiled material in the related art.

[0005] The technical solution of the present invention is as follows: The present invention proposes a multi-channel composite polyethylene polypropylene waterproof roll, which is composed of two or more polyethylene polypropylene waterproof rolls, one side of the polyethylene polypropylene waterproof roll has an insertion gap, and the insertion gap is used for the partial insertion of another polyethylene polypropylene waterproof roll; the polyethylene polypropylene waterproof roll includes, from top to bottom, a first polyethylene polypropylene layer, a first polymer adhesive layer, a second polyethylene polypropylene layer, a second polymer adhesive layer, a first isolation layer, and also includes a second isolation layer, the insertion gap is arranged between the first polymer adhesive layer and the second polyethylene polypropylene layer, and the second isolation layer is arranged The lower surface of the first polymer bonding layer is arranged in the insertion gap, and the first polyethylene polypropylene layer and the second polyethylene polypropylene layer are both composited by polyethylene sheets and polypropylene cloth; the polyethylene sheets include the following component raw materials in parts by weight: 80-90 parts of polyethylene, 5-10 parts of polyvinyl alcohol fibers, 0.2-0.5 parts of antioxidants, 0.1-0.3 parts of ultraviolet absorbers, 0.1-0.3 parts of lubricants, and 1-3 parts of plasticizers. The polyvinyl alcohol fibers are composed of first polyvinyl alcohol fibers and second polyvinyl alcohol fibers, and the first polyvinyl alcohol fibers and the second polyvinyl alcohol fibers have different linear densities.

[0006] As a further technical solution, after a part of another polyethylene polypropylene waterproof membrane is inserted, the first isolation layer and the second isolation layer are removed, and the first polyethylene polypropylene layer of the other polyethylene polypropylene waterproof membrane is compounded with the first polymer adhesive layer, and the second polyethylene polypropylene layer is compounded with the second polymer adhesive layer.

[0007] As a further technical solution, the linear density of the first polyvinyl alcohol fiber is 0.91 g / cm 3 The linear density of the second polyvinyl alcohol fiber is 1.3 g / cm 3 The mass ratio of the first polyvinyl alcohol fiber to the second polyvinyl alcohol fiber is 1:3~4.

[0008] As a further technical solution, the raw material of the polyethylene sheet layer also includes calcium carbonate, and the mass ratio of the polyvinyl alcohol fiber to the calcium carbonate is 2:4-5.

[0009] In the present invention, polyvinyl alcohol fiber and calcium carbonate are added simultaneously to exert the synergistic effect of the two, fill the tiny gaps, and further enhance the mechanical strength of the multi-layer composite polyethylene polypropylene waterproof coiled material.

[0010] As a further technical solution, the calcium carbonate is modified calcium carbonate, and the modified calcium carbonate is obtained by modifying calcium carbonate with a modifier, and the modifier is a fluoroalkyl alcohol compound.

[0011] In the present invention, the calcium carbonate is modified by using a fluoroalkyl alcohol compound, the compatibility of the calcium carbonate with the polyethylene matrix is ​​improved, the uniform dispersion of the calcium carbonate is promoted, and the mechanical strength of the multi-layer composite polyethylene polypropylene waterproof membrane is further enhanced.

[0012] As a further technical solution, the raw materials of the modified calcium carbonate include a modifier and calcium carbonate in a mass ratio of 2 to 3:30.

[0013] As a further technical solution, the preparation method of the modified calcium carbonate comprises the following steps: dispersing the modifier in a solution, adding calcium carbonate, stirring, filtering and drying to obtain the modified calcium carbonate.

[0014] As a further technical solution, the solution is anhydrous ethanol, and the mass ratio of the solution to the calcium carbonate is 10:1.

[0015] As a further technical solution, the stirring time is 2 hours.

[0016] As a further technical solution, the fluoroalkyl alcohol compound includes one or more of 5-fluoropentane-1-ol, 2-fluoropropane-1-ol, and 10-fluorodecane-1-ol.

[0017] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

[0018] As a further technical solution, the ultraviolet absorber includes one or more of UV-531, UV-326, and UV-328.

[0019] As a further technical solution, the lubricant includes one or both of stearic acid and calcium stearate.

[0020] As a further technical solution, the plasticizer includes one or both of dioctyl phthalate and dibutyl phthalate.

[0021] As a further technical solution, the first polymer adhesive layer and the second polymer adhesive layer independently include the following component raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 20-30 parts of tackifying resin, 10-20 parts of paraffin wax, and 0.5-1 part of antioxidant.

[0022] As a further technical solution, the tackifying resin includes one or more of rosin resin, petroleum resin, and coumarone resin.

[0023] As a further technical solution, the antioxidant includes one or more of antioxidant 1010 , antioxidant 168 , and antioxidant 1076 .

[0024] The present invention also provides a method for preparing a multi-layer composite polyethylene polypropylene waterproof coiled material, comprising the following steps: S1, weighing the raw materials of the polyethylene sheet layer of the components in parts by weight, mixing, melting, and extruding, and then hot-pressing and compounding with the polypropylene cloth to obtain a polyethylene polypropylene layer; S2, weighing the polymer adhesive layer raw materials of the components in parts by weight, mixing, melting and then extruding to form, respectively obtaining a first polymer adhesive layer material and a second polymer adhesive layer material; S3, applying the first polymer adhesive layer material between the first polyethylene polypropylene layer and the second polyethylene polypropylene layer, and between the first polyethylene polypropylene layer and the second isolation layer to form a first polymer adhesive layer; applying the second polymer layer material between the second polyethylene polypropylene layer and the first isolation layer to form a second polymer adhesive layer, and obtaining a polyethylene polypropylene waterproof coiled material; S4. Overlap two or more polyethylene polypropylene waterproof membranes in the gap between the polyethylene polypropylene waterproof membranes according to the insertion method, so as to obtain multiple composite polyethylene polypropylene waterproof membranes.

[0025] As a further technical solution, the method for preparing the polypropylene cloth in S1 comprises the following steps: melt-spinning polypropylene particles in a spinning machine to form polypropylene cloth.

[0026] As a further technical solution, the overlap width in S4 is 8-10 cm, and the overlap position is located on the long side of the polyethylene polypropylene waterproof membrane.

[0027] As a further technical solution, the thickness of the first polymer adhesive layer and the second polymer adhesive layer are independently 0.1-2 mm.

[0028] As a further technical solution, the thickness of the polypropylene cloth is 0.1 mm.

[0029] As a further technical solution, the thickness of the polyethylene sheet layer is 0.5-0.9 mm.

[0030] As a further technical solution, the thickness of the isolation layer is 0.01 mm.

[0031] As a further technical solution, the isolation layer is a release paper or a release film coated with silicone oil.

[0032] The working principle and beneficial effects of the present invention are: In the present invention, a multi-layer polyethylene polypropylene waterproof material layer is composited with a polymer adhesive layer to prepare a waterproof roll material, and each layer is tightly fitted to enhance the overall waterproof performance and mechanical strength of the waterproof roll material. Polyvinyl alcohol fibers with different linear densities are added to the multi-layer polyethylene polypropylene waterproof material layer to exert the synergistic effect of the two, enhance the density of the polyethylene polypropylene waterproof material layer, reduce the channels for water penetration, and improve the waterproof performance and mechanical strength of the multi-layer composite polyethylene polypropylene waterproof roll material. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the following examples and comparative examples: Calcium carbonate: average particle size is 5000 mesh; The first polyvinyl alcohol fiber: linear density is 0.91g / cm 3 , length is 12mm; Second polyvinyl alcohol fiber: linear density 1.3g / cm 3 , length is 12mm; Polyethylene: High-density polyethylene, model 5000S; Ethylene-vinyl acetate copolymer: model FL 00328, purchased from ExxonMobil Chemical Co., Ltd. Rosin resin: model 424#; Petroleum resin: C9 petroleum resin; Coumarone resin: model C-120; The first isolation layer and the second isolation layer: a release film coated with silicone oil, with a thickness of 0.01 mm; The first polymer adhesive layer and the second polymer adhesive layer: thickness is 1 mm; Polyethylene sheet: thickness 0.6mm; Polypropylene cloth: thickness 0.1mm; Polypropylene particles: density is 0.9g / cm 3 , purchased from Dongguan Xinlei Plastic Co., Ltd.

[0035] Example 1 A method for preparing a multi-layer composite polyethylene polypropylene waterproof coiled material comprises the following steps: S1, weighing 80 parts of polyethylene, 5 parts of polyvinyl alcohol fiber, 0.2 parts of antioxidant 1010, 0.1 parts of ultraviolet absorber UV-531, 0.1 parts of stearic acid, and 1 part of dioctyl phthalate, forming a polyethylene sheet after mixing, melting, and extruding, melt-spinning polypropylene particles in a spinning machine to form a polypropylene cloth, and hot-pressing the polyethylene sheet and the polypropylene cloth to obtain a polyethylene polypropylene waterproof material layer, wherein the polyvinyl alcohol fiber is composed of a first polyvinyl alcohol fiber and a second polyvinyl alcohol fiber in a mass ratio of 1:2; S2, weighing 40 parts of ethylene-vinyl acetate copolymer, 20 parts of rosin resin, 10 parts of paraffin wax, and 0.5 parts of antioxidant 1010, mixing, melting, and then extruding to obtain a first polymer adhesive layer material and a second polymer adhesive layer material, respectively; S3, applying the first polymer adhesive layer material between the first polyethylene polypropylene layer and the second polyethylene polypropylene layer, and between the first polyethylene polypropylene layer and the second isolation layer to form a first polymer adhesive layer; applying the second polymer layer material between the second polyethylene polypropylene layer and the first isolation layer to form a second polymer adhesive layer, and obtaining a polyethylene polypropylene waterproof coiled material; S4. Overlap two polyethylene polypropylene waterproof membranes in the gap between them according to the insertion method of the plug-in interlocking overlap structure. After heating and pressing, cooling, shaping, rolling and packaging, multiple composite polyethylene polypropylene waterproof membranes are obtained, wherein the overlap width is 8 cm, and the edges selected for the overlap are the long side edges of the two polyethylene polypropylene waterproof membranes.

[0036] Example 2 A method for preparing a multi-layer composite polyethylene polypropylene waterproof coiled material comprises the following steps: S1. Weigh 85 parts of polyethylene, 8 parts of polyvinyl alcohol fiber, 0.4 parts of antioxidant 168, 0.2 parts of ultraviolet absorber UV-326, 0.2 parts of stearic acid, and 2 parts of dioctyl phthalate, mix, melt, and extrude to form a polyethylene sheet, melt-spin polypropylene particles in a spinning machine to form a polypropylene filament cloth, and hot-press and composite the polyethylene sheet with the polypropylene filament cloth to obtain a polyethylene polypropylene waterproof material layer, wherein the polyvinyl alcohol fiber is composed of a first polyvinyl alcohol fiber and a second polyvinyl alcohol fiber in a mass ratio of 1:2; S2, weighing 50 parts of ethylene-vinyl acetate copolymer, 25 parts of coumarone resin, 15 parts of paraffin wax, and 1680.8 parts of antioxidant, mixing, melting, and then extruding to obtain a first polymer adhesive layer material and a second polymer adhesive layer material, respectively; S3, applying the first polymer adhesive layer material between the first polyethylene polypropylene layer and the second polyethylene polypropylene layer, and between the first polyethylene polypropylene layer and the second isolation layer to form a first polymer adhesive layer; applying the second polymer layer material between the second polyethylene polypropylene layer and the first isolation layer to form a second polymer adhesive layer, and obtaining a polyethylene polypropylene waterproof coiled material; S4. Overlap two polyethylene polypropylene waterproof membranes in the gap between them according to the insertion method of the plug-in interlocking overlap structure. After heating and pressing, cooling, shaping, rolling and packaging, multiple composite polyethylene polypropylene waterproof membranes are obtained, wherein the overlap width is 9 cm, and the edges selected for the overlap are the long side edges of the two polyethylene polypropylene waterproof membranes.

[0037] Example 3 A method for preparing a multi-layer composite polyethylene polypropylene waterproof coiled material comprises the following steps: S1, weighing 90 parts of polyethylene, 10 parts of polyvinyl alcohol fiber, 0.5 parts of antioxidant 1076, 0.3 parts of ultraviolet absorber UV-328, 0.3 parts of calcium stearate, and 3 parts of dibutyl phthalate, mixing, melting, and extruding to form a polyethylene sheet, melt-spinning polypropylene particles in a spinning machine to form a polypropylene filament cloth, and hot-pressing the polyethylene sheet and the polypropylene filament cloth to obtain a polyethylene polypropylene waterproof material layer, wherein the polyvinyl alcohol fiber is composed of a first polyvinyl alcohol fiber and a second polyvinyl alcohol fiber in a mass ratio of 1:2; S2, weighing 60 parts of ethylene-vinyl acetate copolymer, 30 parts of petroleum resin, 20 parts of paraffin wax, and 1 part of antioxidant 1076, mixing, melting, and then extruding to obtain a first polymer adhesive layer material and a second polymer adhesive layer material, respectively; S3, applying the first polymer adhesive layer material between the first polyethylene polypropylene layer and the second polyethylene polypropylene layer, and between the first polyethylene polypropylene layer and the second isolation layer to form a first polymer adhesive layer; applying the second polymer layer material between the second polyethylene polypropylene layer and the first isolation layer to form a second polymer adhesive layer, and obtaining a polyethylene polypropylene waterproof coiled material; S4. Overlap two polyethylene polypropylene waterproof membranes in the gap between them according to the insertion method of the plug-in interlocking overlap structure. After heating and pressing, cooling, shaping, rolling and packaging, multiple composite polyethylene polypropylene waterproof membranes are obtained, wherein the overlap width is 10 cm, and the edges selected for the overlap are the long side edges of the two polyethylene polypropylene waterproof membranes.

[0038] Example 4 Compared with Example 1, Example 4 is different in that the polyvinyl alcohol fiber consists of a first polyvinyl alcohol fiber and a second polyvinyl alcohol fiber in a mass ratio of 1:3.

[0039] Example 5 Compared with Example 1, the difference of Example 5 is that the polyvinyl alcohol fiber consists of the first polyvinyl alcohol fiber and the second polyvinyl alcohol fiber in a mass ratio of 1:4.

[0040] Example 6 Compared with Example 1, Example 6 is different in that the polyvinyl alcohol fiber consists of a first polyvinyl alcohol fiber and a second polyvinyl alcohol fiber in a mass ratio of 1:5.

[0041] Example 7 Compared with Example 5, the difference of Example 7 is that the raw material of the polyethylene sheet layer also includes 10 parts of calcium carbonate.

[0042] Example 8 Compared with Example 5, the difference of Example 8 is that the raw material of the polyethylene sheet layer also includes 12.5 parts of calcium carbonate.

[0043] Example 9 The preparation method of modified calcium carbonate comprises the following steps: dispersing 2 parts of 2-fluoropropane-1-ol in 200 parts of anhydrous ethanol, adding 20 parts of calcium carbonate, stirring for 2 hours, filtering and drying to obtain modified calcium carbonate; Compared with Example 8, the difference of Example 9 is that calcium carbonate is replaced by modified calcium carbonate obtained by the above preparation method.

[0044] Example 10 Compared with Example 9, the difference in Example 10 is that the added amount of 2-fluoropropane-1-ol is 3 parts.

[0045] Embodiment 11 Compared with Example 10, Example 11 is different in that 2-fluoropropane-1-ol is replaced with an equal amount of 5-fluoropentane-1-ol.

[0046] Example 12 Compared with Example 10, Example 12 is different in that 2-fluoropropane-1-ol is replaced by an equal amount of 10-fluorodecane-1-ol.

[0047] Comparative Example 1 Compared with Example 1, the difference in Comparative Example 1 is that the polyvinyl alcohol fiber is the first polyvinyl alcohol fiber.

[0048] Comparative Example 2 Compared with Example 1, the difference in Comparative Example 2 is that the polyvinyl alcohol fiber is a second polyvinyl alcohol fiber.

[0049] Comparative Example 3 Compared with Example 5, the difference in Comparative Example 3 is that the polyvinyl alcohol fiber is replaced by an equal amount of calcium carbonate.

[0050] The multi-layer composite polyethylene polypropylene waterproof membranes prepared in Examples 1 to 12 and Comparative Examples 1 to 3 were tested according to the following method: 1. Waterproofness: According to the test method specified in GB / T 23457-2017 "Pre-laid waterproof membrane", the water-impermeability of the sample is tested. The test conditions are: 0.6MPa, 120min.

[0051] 2. Tensile strength: Test the tensile strength of the sample according to the test method specified in GB 18173.1-2012 "Polymer Waterproof Materials Part 1: Sheet Materials".

[0052] 3. Tear strength: Test the tear strength of the sample according to the test method specified in GB 18173.1-2012 "Polymer Waterproof Materials Part 1: Sheet Materials".

[0053] The test results are shown in the following table: Table 1 Performance test results of the single-layer polyethylene polypropylene waterproof membrane prepared in Example 11

[0054] Table 2 Performance test results of multi-layer composite polyethylene polypropylene waterproof membranes prepared in Examples 1 to 12 and Comparative Examples 1 to 3

[0055] Compared with Comparative Examples 1 and 2, Example 1 adds the first polyvinyl alcohol fiber and the second polyvinyl alcohol fiber at the same time. As a result, the water impermeability, tensile strength and tear strength of Example 1 are better than those of Comparative Examples 1 and 2, indicating that the first polyvinyl alcohol fiber and the second polyvinyl alcohol fiber play a synergistic role in improving the waterproof performance and mechanical strength of the multi-channel composite polyethylene polypropylene waterproof membrane.

[0056] Compared with Example 1, Examples 4 to 6 added the first polyvinyl alcohol fiber and the second polyvinyl alcohol fiber in different mass ratios. As a result, the tensile strength and tear strength of Examples 4 and 5 were better than those of Examples 1 and 6, indicating that when the mass ratio of the first polyvinyl alcohol fiber to the second polyvinyl alcohol fiber is 1:3 to 4, the mechanical strength of the multi-channel composite polyethylene polypropylene waterproof membrane can be further improved.

[0057] Compared with Example 5 and Comparative Example 3, Examples 7 and 8 simultaneously added polyvinyl alcohol fiber and calcium carbonate. As a result, the tensile strength and tear strength of Examples 7 and 8 were better than those of Example 5 and Comparative Example 3, indicating that polyvinyl alcohol fiber and calcium carbonate play a synergistic role and can further improve the mechanical strength of the multi-layer composite polyethylene polypropylene waterproof membrane.

[0058] Compared with Example 8, Examples 9 to 12 added modified calcium carbonate. As a result, the tensile strength and tear strength of Examples 9 to 12 were better than those of Example 8, indicating that when modified calcium carbonate was added, the mechanical strength of the obtained multi-channel composite polyethylene polypropylene waterproof membrane was higher.

[0059] In Examples 10 to 12, different types of modifiers were added. As a result, the tensile strength and tear strength of Example 11 were better than those of Examples 10 and 12, indicating that when the modifier was 5-fluoropentan-1-ol, the mechanical strength of the multi-layer composite polyethylene polypropylene waterproof membrane could be further improved.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-layer composite polyethylene polypropylene waterproof coiled material, characterized in that: The invention is composed of two or more polyethylene polypropylene waterproofing coiled materials, one side of which is provided with an insertion gap, and the insertion gap is used for partially inserting another polyethylene polypropylene waterproofing coiled material; the polyethylene polypropylene waterproofing coiled material comprises, from top to bottom, a first polyethylene polypropylene layer, a first polymer adhesive layer, a second polyethylene polypropylene layer, a second polymer adhesive layer, a first isolation layer, and a second isolation layer, the insertion gap is arranged between the first polymer adhesive layer and the second polyethylene polypropylene layer, the second isolation layer is arranged on the lower surface of the first polymer adhesive layer in the insertion gap, the first polyethylene polypropylene layer and the second polyethylene polypropylene layer are both composited by polyethylene sheets and polypropylene cloth; the polyethylene sheets comprise the following component raw materials in parts by weight: 80-90 parts of polyethylene, 5-10 parts of polyvinyl alcohol fibers, 0.2-0.5 parts of antioxidants, 0.1-0.3 parts of ultraviolet absorbers, 0.1-0.3 parts of lubricants, and 1-3 parts of plasticizers, the polyvinyl alcohol fibers consist of first polyvinyl alcohol fibers and second polyvinyl alcohol fibers, and the first polyvinyl alcohol fibers and the second polyvinyl alcohol fibers have different linear densities.

2. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 1, characterized in that: The linear density of the first polyvinyl alcohol fiber is 0.91 g / cm 3 The linear density of the second polyvinyl alcohol fiber is 1.3 g / cm 3 The mass ratio of the first polyvinyl alcohol fiber to the second polyvinyl alcohol fiber is 1:3~4.

3. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 1, characterized in that: The raw material of the polyethylene sheet layer also includes calcium carbonate, and the mass ratio of the polyvinyl alcohol fiber to the calcium carbonate is 2:4-5.

4. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 1, characterized in that: The calcium carbonate is modified calcium carbonate, which is obtained by modifying calcium carbonate with a modifier, and the modifier is a fluoroalkyl alcohol compound.

5. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 4, characterized in that: The raw materials of the modified calcium carbonate include a modifier and calcium carbonate in a mass ratio of 2 to 3:

30.

6. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 4, characterized in that: The fluoroalkyl alcohol compound includes one or more of 5-fluoropentane-1-ol, 2-fluoropropane-1-ol, and 10-fluorodecane-1-ol.

7. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 1, characterized in that: It also includes at least one of the following technical features: The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076; The ultraviolet absorber includes one or more of UV-531, UV-326, and UV-328; The lubricant includes one or both of stearic acid and calcium stearate; The plasticizer includes one or both of dioctyl phthalate and dibutyl phthalate.

8. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 1, characterized in that: The first polymer adhesive layer and the second polymer adhesive layer independently include the following component raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 20-30 parts of tackifying resin, 10-20 parts of paraffin wax, and 0.5-1 part of antioxidant.

9. The multi-layer composite polyethylene polypropylene waterproofing membrane according to claim 8, characterized in that: The tackifying resin includes one or more of rosin resin, petroleum resin and coumarone resin.

10. The method for preparing a multi-layer composite polyethylene polypropylene waterproofing membrane according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, weighing the raw materials of the polyethylene sheet layer of the components in parts by weight, mixing, melting, and extruding, and then hot-pressing and compounding with the polypropylene cloth to obtain a polyethylene polypropylene layer; S2, weighing the polymer adhesive layer raw materials of the components in parts by weight, mixing, melting and then extruding to form, respectively obtaining a first polymer adhesive layer material and a second polymer adhesive layer material; S3, applying the first polymer adhesive layer material between the first polyethylene polypropylene layer and the second polyethylene polypropylene layer, and between the first polyethylene polypropylene layer and the second isolation layer to form a first polymer adhesive layer; applying the second polymer layer material between the second polyethylene polypropylene layer and the first isolation layer to form a second polymer adhesive layer, and obtaining a polyethylene polypropylene waterproof coiled material; S4. Overlap two or more polyethylene polypropylene waterproof membranes in the gap between the polyethylene polypropylene waterproof membranes according to the insertion method, so as to obtain multiple composite polyethylene polypropylene waterproof membranes.

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