A hot-melt adhesive film for polymer pre-laid waterproofing coiled material and a preparation method thereof

Abstract

The present application relates to a kind of hot melt adhesive film for polymer pre-laid waterproofing membrane and its preparation method, and the polymer pre-laid waterproofing membrane has polymer base material layer and adhesive layer, and the hot melt adhesive film includes first adhesive layer, transition layer, barrier layer and second adhesive layer arranged in sequence, first adhesive layer is used to be bonded with polymer base material layer, and second adhesive layer is used to be bonded with adhesive layer, wherein, first adhesive layer is thermoplastic polyolefin elastomer layer, barrier layer is nylon layer, and the raw material of second adhesive layer includes styrene-ethylene-butylene-styrene block copolymer, copolyester and tackifying resin.The present application can significantly improve the dimensional stability and tensile force retention rate after heat aging of polymer pre-laid waterproofing membrane by designing a kind of multilayer structure hot melt adhesive film in polymer base material layer and adhesive layer of polymer pre-laid waterproofing membrane, and also has excellent cold and hot cycle resistance.

Description

[0001] This application is a divisional application filed on July 3, 2023, with application number 2023107992473, entitled "A Polymer Pre-laid Waterproof Membrane and Its Preparation Method and Hot Melt Adhesive Film". Technical Field

[0002] This invention belongs to the field of waterproof membrane technology, specifically relating to a hot melt adhesive film for pre-laid polymer waterproof membrane and its preparation method. Background Technology

[0003] Compared with traditional SBS bitumen-based waterproof membranes, polymer pre-laid waterproof membranes have the following advantages: 1) The waterproof layer fully adheres to the concrete, forming a skin-like bond, achieving fusion between the structure and the waterproof layer, and eliminating water seepage channels; 2) Loose-lay construction, with low requirements for the substrate; 3) The construction process is safe and environmentally friendly, with fast construction speed and short construction period. A single layer of polymer pre-laid waterproof membrane can meet the Class I waterproofing requirements. Therefore, in recent years, pre-laid waterproof membranes have developed rapidly, with increasing usage, and are widely used in engineering fields such as basements, underground pipe corridors, subways, tunnels, nuclear power plants, and military facilities.

[0004] Existing pre-laid polymer waterproof membranes typically consist of a polymer substrate layer, an adhesive layer, and a protective isolation layer (usually an inorganic sand layer or an organic coating). However, there are risks that the dimensional change rate and tensile strength retention rate after heat aging of the waterproof membrane may not meet the requirements of GB / T23457-2017. Furthermore, during construction and use, there is a risk that the adhesive layer may detach from the polymer sheet layer, reducing the reliability of the pre-laid polymer waterproof membrane.

[0005] In the field of pre-applied polymer waterproof membranes, to improve the adhesion between the adhesive layer and the polymer substrate layer, a common method is to perform online corona treatment on the polymer substrate before applying the pressure-sensitive adhesive layer to increase the surface polarity of the polymer substrate. However, in practical applications, it has been found that the surface tension of the polymer substrate decreases after corona treatment, eventually causing the adhesive layer to detach from the substrate layer. Moreover, this corona treatment method does not help improve the dimensional stability or tensile strength retention after heat aging of the polymer waterproof membrane. Some patents use a primer coating method, which can improve the dimensional stability and tensile strength retention after heat aging of the polymer waterproof membrane. However, when applied in areas with large temperature differences between winter and summer, such as northern regions where winter temperatures are extremely low and summer temperatures are extremely high, the problem of delamination still exists under these hot and cold cycles. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an improved polymer pre-laid waterproof membrane to address the shortcomings of the prior art. This polymer pre-laid waterproof membrane has good resistance to thermal cycling, as well as excellent dimensional stability and tensile strength retention after thermal aging.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A pre-laid polymer waterproof membrane includes a polymer substrate layer, an adhesive layer, and an anti-adhesive layer stacked sequentially. The pre-laid polymer waterproof membrane also includes a hot melt adhesive film disposed between the polymer substrate layer and the adhesive layer. The hot melt adhesive film includes a first adhesive layer, a transition layer, a barrier layer, and a second adhesive layer stacked sequentially. The first adhesive layer is used to bond to the polymer substrate layer, and the second adhesive layer is used to bond to the adhesive layer. The first adhesive layer is a thermoplastic polyolefin elastomer layer, the barrier layer is a nylon layer, and the raw materials of the second adhesive layer include a styrene-ethylene-butene-styrene block copolymer, a copolyester, and a tackifying resin. The mass ratio of the styrene-ethylene-butene-styrene block copolymer, the copolyester, and the tackifying resin is 40–60:10–30:10–30, and the copolyester is a thermoplastic copolyether ester.

[0009] In some specific embodiments of the present invention, the melt index of the thermoplastic copolyether ester is 10-20 g / 10 min (2.16 kg / 160 °C). For example, ES-5 from Nantong Xiexin Hot Melt Adhesive Co., Ltd. (melt index is 15 g / 10 min).

[0010] In some embodiments of the present invention, the mass ratio of the styrene-ethylene-butene-styrene block copolymer (SEBS), copolyester, and tackifying resin is 45-55:15-25:15-25.

[0011] The SEBS used may be Kraton SEBS, such as Kraton G1657 or Kraton G1726.

[0012] In some specific embodiments of the present invention, in the second adhesive layer, the tackifying resin is one or a combination of several selected from pentaerythritol rosin, terpene phenolic resin, terpene resin, and hydrogenated rosin resin. Preferably, in the second adhesive layer, the tackifying resin is pentaerythritol rosin, which has good compatibility with low-polarity SEBS and copolyesters.

[0013] In some embodiments of the present invention, the crystallinity of the nylon layer is 62% or higher. The crystallinity is measured using X-ray diffraction.

[0014] In some embodiments of the present invention, the raw materials of the first adhesive layer include thermoplastic polyolefin elastomer and tackifying resin, wherein the mass ratio of the thermoplastic polyolefin elastomer to the tackifying resin is 50-90:10-30.

[0015] In some specific embodiments of the present invention, in the first adhesive layer, the thermoplastic polyolefin elastomer is POE; the tackifying resin is one or more of hydrogenated petroleum resin, rosin resin, hydrogenated rosin resin, terpene phenolic resin, and terpene resin.

[0016] In this invention, POE refers to a random copolymer elastomer produced by in-situ polymerization of ethylene and high-carbon α-olefins (1-butene, 1-hexene, 1-octene, etc.) using a metallocene catalyst. Preferably, the POE is an ethylene-octene copolymer. Specifically, the POE may be selected from Dow Chemical's Engage series products, such as Engage 8440 and Engage 6002.

[0017] Preferably, in the first adhesive layer, the tackifying resin is a hydrogenated petroleum resin with low polarity, ensuring good adhesion to the low-polarity polymer substrate layer. Specifically, ExxonMobil's hydrogenated petroleum resins 5600 and 5400 can be used.

[0018] In some embodiments of the present invention, the raw materials of the transition layer include thermoplastic polyolefin elastomer, tackifying resin and nylon, wherein the mass ratio of the polyolefin elastomer, tackifying resin and nylon is 20-40:5-15:20-40.

[0019] In some specific embodiments of the present invention, the thermoplastic polyolefin elastomer in the transition layer is POE, and the tackifying resin is one or a combination of several of terpene phenolic resin, rosin pentaerythritol ester, and terpene resin.

[0020] Preferably, in the transition layer, the tackifying resin is a terpene phenolic resin, which has good compatibility with both polar nylon and non-polar polyolefin elastomers. Using terpene phenolic resin as an intermediate phase can greatly improve the compatibility between nylon and polyolefin elastomers and ensure the stability of the film performance.

[0021] In some specific embodiments of the present invention, the thickness of the first adhesive layer is 0.01 to 0.05 mm, the thickness of the transition layer is 0.01 to 0.05 mm, the thickness of the barrier layer is 0.01 to 0.05 mm, and the thickness of the second adhesive layer is 0.01 to 0.05 mm.

[0022] In some specific embodiments of the present invention, in the first adhesive layer, the mass ratio of the polyolefin elastomer to the tackifying resin is 60-80:15-25; in the transition layer, the mass ratio of the polyolefin elastomer, the tackifying resin, and the nylon is 25-35:10-15:25-35; and in the second adhesive layer, the mass ratio of the styrene-ethylene-butene-styrene block copolymer, the copolyester, and the tackifying resin is 45-55:15-25:15-25.

[0023] In some embodiments of the present invention, the method for preparing the hot melt adhesive film includes the following steps:

[0024] Step S1: Mix all the raw materials of the first adhesive layer, and then extrude and granulate them to obtain the first adhesive layer granules;

[0025] Step S2: Mix all the raw materials of the transition layer, and then extrude and granulate them to obtain transition layer granules;

[0026] Step S3: Mix all the raw materials of the second adhesive layer, and then extrude and granulate them to obtain the second adhesive layer granules;

[0027] Step S4: Add the first adhesive layer granules, transition layer granules, nylon, and second adhesive layer granules to a co-extrusion device and co-extrude them to obtain the hot melt adhesive film.

[0028] In some specific embodiments of the present invention, the working temperature of the first adhesive layer for extrusion granulation is 130-180°C, the working temperature of the transition layer for extrusion granulation is 140-200°C, the working temperature of the second adhesive layer for extrusion granulation is 150-180°C, and the working temperature of the co-extrusion die of the co-extrusion equipment is 140-220°C.

[0029] In some embodiments of the present invention, the polymer substrate layer is a polyethylene substrate layer or a thermoplastic elastomer substrate layer; and / or,

[0030] The adhesive layer is a styrene-isoprene-styrene block copolymer-based hot melt pressure-sensitive adhesive layer; and / or...

[0031] The anti-sticking layer is an anti-sticking particle layer.

[0032] In some specific embodiments of the present invention, the raw material formulation of the substrate layer, by weight, includes 60-130 parts of polyethylene, 0-10 parts of thermoplastic polyolefin elastomer, and 3-8 parts of additives; and / or,

[0033] By weight, the adhesive layer comprises 20-40 parts of styrene-isoprene-styrene block copolymer, 35-65 parts of tackifying resin, 15-25 parts of softening oil, and 0-1.5 parts of additives; and / or,

[0034] The anti-sticking layer is made of modified mullite.

[0035] In some specific embodiments of the present invention, in the substrate layer, the additives include one or more combinations of antioxidants, anti-aging agents, and colorants; in the adhesive layer, the additives include one or more combinations of antioxidants and ultraviolet light stabilizers.

[0036] The second technical solution adopted by the present invention is: a method for preparing the above-mentioned polymer pre-laid waterproof membrane, comprising the following steps:

[0037] A polymer substrate layer is prepared, and then the polymer substrate layer is thermally laminated with a hot melt adhesive film. An adhesive layer and an anti-adhesive layer are then prepared sequentially on the hot melt adhesive film.

[0038] In some specific embodiments of the present invention, the temperature used for thermal bonding is 170-190°C and the pressure is 0.5-0.8 MPa.

[0039] The third technical solution adopted by the present invention is: a hot melt adhesive film in a pre-laid polymer waterproof membrane as described above.

[0040] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0041] This invention designs a multi-layered hot melt adhesive film in the polymer substrate layer and the adhesive layer. The film uses a barrier layer to prevent small molecules in the adhesive layer from migrating into the polymer substrate layer, significantly improving the dimensional stability and tensile strength retention of the pre-laid polymer waterproof membrane after heat aging. In addition, by using a polyolefin elastomer layer as the first adhesive layer to bond with the polymer substrate layer and optimizing the formulation of the second adhesive layer to bond with the adhesive layer, the pre-laid polymer waterproof membrane has excellent heat and cold cycle resistance. After cold and heat cycle testing, the pre-laid polymer waterproof membrane does not delaminate, making it particularly suitable for northern regions and other areas with extremely high summer temperatures and extremely low winter temperatures. Detailed Implementation

[0042] To address the issue of existing pre-applied polymer waterproof membranes being susceptible to thermal cycling and still experiencing delamination after such cycles, this invention provides a pre-applied polymer waterproof membrane resistant to thermal cycling. This membrane can be used in regions with extremely high summer and low winter temperatures, such as northern areas, avoiding the delamination problem in these environments and significantly expanding its application range. Furthermore, this pre-applied polymer waterproof membrane exhibits excellent dimensional stability and tensile strength retention after high-temperature heat aging. Compared to traditional primer-coated pre-applied polymer waterproof membranes, it also boasts advantages such as simpler manufacturing processes and lower energy consumption.

[0043] The main concept of this invention lies in designing a hot melt adhesive film in a polymer substrate layer and an adhesive layer. This hot melt adhesive film includes a first adhesive layer for bonding to the polymer substrate layer, a transition layer, a barrier layer, and a second adhesive layer for bonding to the adhesive layer. Firstly, this hot melt adhesive film can prevent the migration of small molecules from the adhesive layer into the polymer substrate layer, significantly increasing the tensile strength retention rate of the pre-laid polymer waterproof membrane after thermal aging. Secondly, by optimizing the formulation of the second adhesive layer, the pre-laid polymer waterproof membrane exhibits excellent heat and cold cycle resistance. After thermal cycling tests, the pre-laid polymer waterproof membrane does not delaminate, making it particularly suitable for northern regions and other areas with extremely high summer temperatures and extremely low winter temperatures.

[0044] The technical solutions of the present invention will be described in detail below with reference to specific embodiments, so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not limited to the scope of the examples described.

[0045] Example 1

[0046] The pre-laid polymer waterproof membrane provided in this embodiment includes a polymer substrate layer, a hot melt adhesive film, an adhesive layer and an anti-adhesive layer stacked in sequence. The hot melt adhesive film includes a first adhesive layer, a transition layer, a barrier layer and a second adhesive layer stacked in sequence. The first adhesive layer is used to bond with the polymer substrate layer, and the second adhesive layer is used between the adhesive layers.

[0047] In this example, the raw materials for the first adhesive layer are 70 parts of POE and 20 parts of tackifying resin. The POE is selected from Dow Engage 8440 and the tackifying resin is selected from Exxon Hydrogenated Petroleum Resin 5600.

[0048] The transition layer is made of 30 parts POE, 10 parts terpene phenolic resin and 20 parts nylon. The POE is selected from Dow Engage 8440 from the United States, the terpene phenolic resin is selected from Arakawa Terpene Phenolic Resin 803L from Japan, and the nylon is selected from high crystallinity nylon A136L.

[0049] The barrier layer is a nylon layer, and the nylon layer material is high-crystallinity nylon A136L, which comes from China Hengshen Holdings Group Co., Ltd.

[0050] The second adhesive layer is made of 50 parts SEBS, 20 parts pentaerythritol rosin, and 20 parts copolyester. SEBS is selected from Kraton G1657, pentaerythritol rosin is selected from Arizona Chemicals RE100f, and copolyester is selected from Nantong Xiexin Hot Melt Adhesive Co., Ltd.'s thermoplastic copolyether ester ES-5 (melt index of 15g / 10min).

[0051] Hot melt adhesive film is prepared by the following method:

[0052] Step S1: Add all the raw materials of the first adhesive layer into a twin-screw extruder and extrude and granulate to obtain the first adhesive layer granules. The extrusion temperature is 150-160℃.

[0053] Step S2: Add all the raw materials of the transition layer into a twin-screw extruder and extrude and granulate to obtain transition layer granules. The extrusion temperature is 160-170℃.

[0054] Step S3: Add all the raw materials of the second adhesive layer into a twin-screw extruder and extrude and granulate to obtain the second adhesive layer granules. The extrusion temperature is 160-170℃.

[0055] Step S4: Add the first adhesive layer granules, transition layer granules, nylon, and second adhesive layer granules to a multilayer blown film machine, and co-extrude them to obtain a hot melt adhesive film. The temperature of the co-extrusion die is 180-190℃, the thickness of the first adhesive layer is 0.02mm, the thickness of the transition layer is 0.02mm, the thickness of the barrier layer is 0.02mm, and the thickness of the second adhesive layer is 0.02mm.

[0056] In this example, the raw materials for the polymer substrate layer are 70 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 5 parts of POE, 1 part of antioxidant, 0.5 parts of anti-aging agent, and 3 parts of colorant.

[0057] The adhesive layer is made of 30 parts of styrene-isoprene-styrene block copolymer, 40 parts of C5 petroleum resin, 20 parts of naphthenic oil, 0.4 parts of antioxidant and 0.5 parts of UV stabilizer.

[0058] The pre-laid polymer waterproof membrane in this example was prepared using the following method:

[0059] (1) Preparation of polymer substrate

[0060] All raw materials for the polymer substrate are added to a high-speed mixer and mixed at 75-85°C for 15 minutes. Then, a single-screw extruder (with the feeding section, melting section, and metering section of the single screw at 120°C, 180°C, and 210°C respectively) is used for melt extrusion. The extruded material is then pumped to the die head by a melt metering pump to form sheets, and finally calendered by a three-roll calender to obtain the polymer substrate.

[0061] (2) Preparation of composite film of polymer substrate and hot melt adhesive film

[0062] The hot melt adhesive film is laminated with a polymer substrate, and the first adhesive layer is brought into contact with the polymer substrate. The lamination is carried out for 2 seconds at a temperature of 180°C and a pressure of 0.6 MPa.

[0063] (3) Preparation of adhesive layer

[0064] A. Add naphthenic oil, set the heat transfer oil of the heating equipment to 200℃, the material temperature to 180℃, and the stirring frequency to 15Hz;

[0065] B. When the material temperature rises to 120℃, add C5 petroleum resin and hydrogenated rosin glycerol ester, and stir at a frequency of 30Hz.

[0066] C. When the material temperature rises to 140-150℃, add styrene-isoprene-styrene block copolymer, antioxidant and UV stabilizer, and stir at a frequency of 40Hz.

[0067] D. When the material temperature rises to 170℃, vacuuming begins. When the material temperature rises to 180±5℃, the adhesive is discharged.

[0068] E. Apply the adhesive to the hot melt adhesive film using an extruder to form an adhesive layer, and control the thickness of the adhesive layer to be 0.35 mm.

[0069] (4) Preparation of polymer pre-laid waterproof membrane

[0070] Mullite is evenly sprinkled onto the adhesive layer and then rolled with a rubber roller to obtain a pre-laid polymer waterproof membrane.

[0071] Example 2

[0072] The polymer pre-applied waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that:

[0073] In this example, the raw materials for the first adhesive layer are 60 parts of POE and 15 parts of tackifying resin. The POE is selected from Dow Engage 8440 and the tackifying resin is selected from Exxon C5 petroleum resin 5400.

[0074] The transition layer is made of 25 parts POE, 15 parts terpene phenolic resin and 25 parts nylon, wherein the POE is selected from Dow Engage 6002.

[0075] The second adhesive layer is made of 45 parts SEBS, 25 parts pentaerythritol rosin, and 15 parts copolyester.

[0076] Example 3

[0077] The polymer pre-applied waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that:

[0078] In this example, the raw materials for the first adhesive layer are 80 parts of POE and 25 parts of tackifying resin.

[0079] The transition layer is made of 35 parts POE, 15 parts terpene phenolic resin and 25 parts nylon.

[0080] The second adhesive layer is made of 55 parts SEBS, 15 parts pentaerythritol rosin, and 25 parts copolyester.

[0081] Example 4

[0082] The polymer pre-applied waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that:

[0083] In this example, the raw materials for the second adhesive layer are 70 parts SEBS, 10 parts pentaerythritol rosin, and 20 parts copolyester.

[0084] Example 5

[0085] The polymer pre-applied waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that:

[0086] In this example, the raw materials for the first adhesive layer are 90 parts of POE and 10 parts of tackifying resin.

[0087] The transition layer is made of 40 parts POE, 5 parts terpene phenolic resin, and 40 parts nylon.

[0088] The second adhesive layer is made of 60 parts SEBS, 10 parts pentaerythritol rosin, and 10 parts copolyester.

[0089] Example 6

[0090] The polymer pre-applied waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that:

[0091] In this example, the raw materials for the first adhesive layer are 50 parts of POE and 30 parts of tackifying resin.

[0092] The transition layer is made of 20 parts POE, 5 parts terpene phenolic resin and 20 parts nylon.

[0093] The second adhesive layer is made of 40 parts SEBS, 30 parts pentaerythritol rosin, and 30 parts copolyester.

[0094] Example 7

[0095] The polymer pre-laid waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that the copolyester used in the second adhesive layer is thermoplastic copolyether ester ES-6 (melt index of 30g / 10min) from Nantong Xiexin Hot Melt Adhesive Co., Ltd.

[0096] Comparative Example 1

[0097] The polymer pre-laid waterproof membrane provided in this embodiment differs from that in Embodiment 1 in that the copolyester used in the second adhesive layer is polyester PESD-3 (melt index of 20g / 10min) from Nantong Xiexin Hot Melt Adhesive Co., Ltd.

[0098] Comparative Example 2

[0099] The polymer pre-laid waterproof membrane provided in this comparative example differs from that in Example 1 in that it does not use hot melt adhesive film.

[0100] Comparative Example 3

[0101] The polymer pre-laid waterproof membrane provided in this comparative example differs from that in Example 1 in that nylon is used instead of copolyester in the second adhesive layer.

[0102] The performance of the pre-laid waterproof membranes of Examples 1-7 and Comparative Examples 1-3 was tested in accordance with GB / T23457-2017. The results are shown in Table 1. The test method for the delamination performance was the high and low temperature cycling method: the sample was placed in a low temperature environment of -40℃ and a high temperature environment of 85℃, with each temperature lasting 16 hours, for 8 cycles, and then the delamination was observed.

[0103] Table 1. Performance test results of polymer pre-laid waterproof membranes in Examples 1-7 and Comparative Examples 1-3

[0104] Delamination performance Dimensional change rate / % Tensile strength retention rate after heat aging / % Indicator Requirements No glue coming undone ≤±1.5 ≥90 Example 1 No glue coming undone 0.2 98 Example 2 No glue coming undone 0.3 99 Example 3 No glue coming undone 0.3 98 Example 4 No glue coming undone 0.6 91 Example 5 No glue coming undone 0.9 91 Example 6 No glue coming undone 0.2 90 Example 7 No glue coming undone 0.8 96 Comparative Example 1 glue coming undone 0.6 94 Comparative Example 2 glue coming undone 1.5 88 Comparative Example 3 glue coming undone 0.8 97

[0105] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0106] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. A hot melt adhesive film for a pre-laid polymer waterproof membrane, wherein the pre-laid polymer waterproof membrane has a polymer substrate layer and an adhesive layer stacked together, characterized in that: The hot melt adhesive film is disposed between the polymer substrate layer and the adhesive layer. The hot melt adhesive film includes a first adhesive layer, a transition layer, a barrier layer, and a second adhesive layer stacked sequentially. The first adhesive layer is used to bond to the polymer substrate layer, and the second adhesive layer is used to bond to the adhesive layer. The first adhesive layer is a thermoplastic polyolefin elastomer layer, the barrier layer is a nylon layer, and the raw materials of the second adhesive layer include styrene-ethylene-butene-styrene block copolymer, copolyester, and tackifying resin. The copolyester is a thermoplastic copolyether ester, and the mass ratio of the styrene-ethylene-butene-styrene block copolymer, copolyester, and tackifying resin is 40-60:10-30:10-30.

2. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The melt index of the copolyester is 10-20 g / 10 min; and / or the crystallinity of the nylon layer is 62% or higher.

3. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The mass ratio of the styrene-ethylene-butene-styrene block copolymer, copolyester, and tackifying resin is 45-55:15-25:15-25; and / or, in the second adhesive layer, the tackifying resin is one or a combination of several of pentaerythritol rosin, terpene phenolic resin, terpene resin, and hydrogenated rosin resin.

4. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The raw materials of the first adhesive layer include thermoplastic polyolefin elastomer and tackifying resin, wherein the mass ratio of thermoplastic polyolefin elastomer to tackifying resin is 50-90:10-30.

5. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 4, characterized in that: In the first adhesive layer, the thermoplastic polyolefin elastomer is POE; the tackifying resin is one or more of hydrogenated petroleum resin, rosin resin, hydrogenated rosin resin, terpene phenolic resin, and terpene resin.

6. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The raw materials for the transition layer include thermoplastic polyolefin elastomer, tackifying resin and nylon, and the mass ratio of the polyolefin elastomer, tackifying resin and nylon is 20-40:5-15:20-40.

7. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 6, characterized in that: In the transition layer, the thermoplastic polyolefin elastomer is POE, and the tackifying resin is one or a combination of several of the following: terpene phenolic resin, rosin pentaerythritol ester, and terpene resin.

8. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The thickness of the first adhesive layer is 0.01 to 0.05 mm, the thickness of the transition layer is 0.01 to 0.05 mm, the thickness of the barrier layer is 0.01 to 0.05 mm, and the thickness of the second adhesive layer is 0.01 to 0.05 mm.

9. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: In the first adhesive layer, the mass ratio of polyolefin elastomer to tackifying resin is 60-80:15-25; in the transition layer, the mass ratio of polyolefin elastomer, tackifying resin, and nylon is 25-35:10-15:25-35; in the second adhesive layer, the mass ratio of styrene-ethylene-butene-styrene block copolymer, copolyester, and tackifying resin is 45-55:15-25:15-25.

10. The hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 1, characterized in that: The polymer substrate layer is a polyethylene substrate layer or a thermoplastic elastomer substrate layer; and / or, the adhesive layer is a styrene-isoprene-styrene block copolymer-based hot melt pressure-sensitive adhesive layer.

11. A method for preparing a hot melt adhesive film for pre-laid polymer waterproof membrane according to any one of claims 1 to 10, characterized in that: The preparation method of the hot melt adhesive film includes the following steps: Step S1, mixing all the raw materials of the first adhesive layer, and then extruding and granulating to obtain first adhesive layer granules; Step S2, mixing all the raw materials of the transition layer, and then extruding and granulating to obtain transition layer granules; Step S3, mixing all the raw materials of the second adhesive layer, and then extruding and granulating to obtain second adhesive layer granules; Step S4, adding the first adhesive layer granules, transition layer granules, nylon, and second adhesive layer granules to a co-extrusion device and co-extruding and compounding to obtain the hot melt adhesive film.

12. The method for preparing the hot melt adhesive film for pre-laid polymer waterproof membrane according to claim 11, characterized in that: The first adhesive layer operates at an extrusion granulation temperature of 130–180°C, the transition layer operates at an extrusion granulation temperature of 140–200°C, the second adhesive layer operates at an extrusion granulation temperature of 150–180°C, and the co-extrusion die of the co-extrusion equipment operates at an temperature of 140–220°C.