Polymer pre-paved waterproofing roll for tunnels

Abstract

The application relates to the technical field of waterproof coiled materials, and discloses a high-molecular pre-paved waterproof coiled material for tunnels, which comprises, from top to bottom, a magic tape hook surface layer, a magic tape hair surface layer, a high-molecular sheet layer, a glue-adhesive waterproof layer and an anti-adhesive layer; the glue-adhesive waterproof layer is hot-melt pressure-sensitive glue; the hot-melt pressure-sensitive glue comprises the following components by weight: 10-15 parts of naphthenic oil, 20-40 parts of a styrene-isoprene-styrene block copolymer, 10-15 parts of polyisobutylene, 5-10 parts of an amorphous alpha-olefin copolymer, 10-20 parts of water white hydrogenated rosin, 0.5-1.5 parts of an antioxidant, 0.5-1 part of an anti-aging agent and 0.5-1 part of a light stabilizer; the addition amount of the naphthenic oil is less than that of the polyisobutylene. The above technical scheme solves the problem of insufficient peeling strength of the glue-adhesive waterproof layer of the high-molecular pre-paved waterproof coiled material for tunnels in the related art due to the addition of the naphthenic oil.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, specifically to a pre-laid polymer waterproof membrane for tunnels. Background Technology

[0002] In recent years, the proportion of pre-laid waterproof membranes in my country's building waterproofing projects has been increasing year by year. Among them, materials represented by HDPE polymer self-adhesive film and TPO pressure-sensitive adhesive self-adhesive film are being used in more and more construction scenarios.

[0003] However, the application of TPO pre-laid membranes in tunnel waterproofing has received little research. The main reason is that tunnel waterproofing construction requires nailing the membrane onto the initial lining after the initial concrete is laid, and then forming the waterproofing layer into a whole through hot air welding before proceeding with the secondary lining construction. This process is challenging because the membrane is heavy, making nailing difficult, inefficient, and posing safety hazards. Furthermore, nailing the membrane directly onto the initial lining can cause irreversible damage to the membrane layer. Therefore, how to better utilize the superior performance of TPO pre-laid membranes to achieve their intended effect in tunnel construction is a question worthy of our discussion.

[0004] In addition, TPO pre-laid waterproof membranes still have shortcomings in peel strength. Studies have found that naphthenic oil is often added to the adhesive waterproof layer of polymer pre-laid waterproof membranes. Naphthenic oil is widely used as a plasticizer for TPO substrates due to its good compatibility and low-temperature fluidity, in order to improve the material's processing fluidity and low-temperature flexibility. However, the light components contained in naphthenic oil are prone to slowly precipitate during later use, leading to a decrease in the interfacial bonding force between the adhesive layer and the substrate, and thus causing a decrease in peel strength. If the peel strength is insufficient, the waterproofing system of the waterproof membrane will fail, and groundwater will seep through the gaps. Long-term leakage will cause a chain reaction of damage to the tunnel structure, seriously shortening the service life of the tunnel concrete structure.

[0005] Therefore, how to develop a pre-laid waterproof membrane with excellent peel strength and apply it in tunnels is an urgent problem to be solved. Summary of the Invention

[0006] This invention proposes a pre-laid polymer waterproof membrane for tunnels, which solves the problem of insufficient peel strength caused by the addition of naphthenic oil in the adhesive waterproof layer of pre-laid polymer waterproof membranes for tunnels in related technologies.

[0007] The technical solution of this invention is as follows: This invention proposes a pre-laid polymer waterproof membrane for tunnels, which, from top to bottom, includes a hook and loop fastener layer, a hook and loop rough surface layer, a polymer sheet layer, an adhesive waterproof layer, and an anti-adhesive layer. The adhesive waterproof layer is a hot-melt pressure-sensitive adhesive, which includes the following components by weight: 10-15 parts naphthenic oil, 20-40 parts styrene-isoprene-styrene block copolymer, 10-15 parts polyisobutylene, 5-10 parts amorphous α-olefin copolymer, 10-20 parts water-white hydrogenated rosin, 0.5-1.5 parts antioxidant, 0.5-1 part anti-aging agent, and 0.5-1 part light stabilizer. The amount of naphthenic oil added is less than the amount of polyisobutylene added.

[0008] As a further technical solution, an upper welded edge is provided on the upper surface of one side of the pre-laid waterproof membrane. The upper welded edge differs from the main material in that it has no hook and loop fastener layer and no loose hook and loop fastener layer. A lower welded edge is provided on the lower surface of the other side of the welded edge. The lower welded edge differs from the main material in that it has no adhesive waterproof layer and no anti-stick layer.

[0009] As a further technical solution, the width of the hook and loop layer and the loop fabric layer are the same, both being 90~95cm.

[0010] As a further technical solution, the material of the polymer sheet layer includes one of EVA, HDPE, CPE, PE, EPDM, and TPO, preferably TPO.

[0011] As a further technical solution, the width of the polymer sheet layer is 100cm and the thickness is 0.75~1.8mm.

[0012] As a further technical solution, the material of the anti-adhesion layer includes one of cloth, film, and mineral particles, preferably mineral particles, wherein the mineral particles are isolation and protective sand, and the average particle size of the isolation and protective sand is 40-70 mesh.

[0013] As a further technical solution, the width of the anti-adhesive layer is 90~95cm, and the remaining part is covered by a release film.

[0014] As a further technical solution, the adhesive waterproof layer has a width of 90~95cm and a thickness of 0.25~0.5mm.

[0015] As a further technical solution, the structure of the styrene-isoprene-styrene block copolymer includes one or more of linear, star-shaped, and star-line mixed types, and the styrene content of the styrene-isoprene-styrene block copolymer is 14wt%~29wt%.

[0016] As a further technical solution, when the structure of the styrene-isoprene-styrene block copolymer is a star-line mixed type, the styrene content is 14wt%, the diblock content is 12wt%, the melt mass flow rate is 9g / 10min, and the test conditions are 200℃ / 5kg.

[0017] As a further technical solution, the polyisobutylene is a highly active low-molecular-weight polyisobutylene, wherein the mass fraction of the α-double bond of the highly active low-molecular-weight polyisobutylene is ≥80%, and the number average molecular weight is 1200~1600.

[0018] In this invention, a pre-laid polymer waterproof membrane for tunnels incorporates highly active low-molecular-weight polyisobutylene into the hot-melt pressure-sensitive adhesive. Its high activity provides superior adhesion and toughness enhancement to the pressure-sensitive adhesive. The high-activity low-molecular-weight polyisobutylene has an α-double bond mass fraction ≥80%, exhibiting high double bond activity. This allows for more complete interaction with components such as the styrene-isoprene-styrene block copolymer in the adhesive layer, forming a tighter molecular cross-linking structure. This reduces the decrease in intermolecular forces caused by the softening of naphthenic oil, thus improving the peel resistance of the adhesive layer from within. Furthermore, with a number-average molecular weight of 1200~1600, the polyisobutylene exhibits moderate viscosity in its hot-melt state, enabling rapid penetration into the minute surface gaps of the polymer sheet layer, ensuring interfacial bonding between the adhesive layer and the sheet layer, and avoiding insufficient peel strength due to inadequate wetting.

[0019] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, and antioxidant 264.

[0020] As a further technical solution, the antioxidant includes one or more of antioxidant 4010NA, antioxidant 4020, and antioxidant RD.

[0021] As a further technical solution, the light stabilizer includes one or more of the light stabilizer UV-531, light stabilizer UV-326, and light stabilizer UV-327.

[0022] As a further technical solution, the preparation method of the hot melt pressure-sensitive adhesive includes the following steps:

[0023] S1. Add the naphthenic oil and the poly(ethylene butene) into a reaction vessel, heat to 120°C, add the aqueous hydrogenated rosin, and melt completely to obtain a mixture;

[0024] S2. When the mixture is heated to 145~150℃, the styrene-isoprene-styrene block copolymer, amorphous α-olefin copolymer, antioxidant, anti-aging agent and light stabilizer are added, and the temperature is raised to 175~185℃ to completely melt and obtain the hot melt pressure-sensitive adhesive.

[0025] The working principle and beneficial effects of this invention are as follows:

[0026] 1. In the present invention, a polymer pre-laid waterproof membrane for tunnels is provided with a Velcro layer on the polymer sheet layer. During construction, the Velcro hook layer can be directly nailed and fixed to the primary lining concrete of the tunnel. This layer is lightweight and easy to nail. After nailing, the TPO pre-laid waterproof membrane with the Velcro rough surface layer can be directly and quickly pasted onto the Velcro hook layer, and then the secondary lining concrete can be poured directly.

[0027] 2. This invention incorporates polyisobutylene into the hot-melt pressure-sensitive adhesive of the pre-laid polymer waterproof membrane for tunnels, reducing the amount of naphthenic oil used and minimizing the precipitation of light components during later use, thus ensuring material stability. Simultaneously, polyisobutylene provides superior tackification and toughening to the hot-melt pressure-sensitive adhesive, effectively improving its bonding performance. Furthermore, polyisobutylene exhibits good compatibility with amorphous α-olefin copolymers and water-white hydrogenated rosin, maximizing the tackification effect of each component. The amorphous α-olefin copolymer raises the softening point of the overall adhesive layer, exhibiting good heat resistance in the high-temperature and high-humidity tunnel environment, ensuring material stability. The synergistic effect of the raw materials enhances the peel strength of the pre-laid polymer waterproof membrane for tunnels. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a schematic diagram of the structure of the pre-laid polymer waterproof membrane for tunnels prepared in Example 2 of the present invention. In the figure, 1 is the hook and loop fastener layer, 2 is the hook and loop rough surface layer, 3 is the polymer sheet layer, 4 is the adhesive waterproof layer, 5 is the anti-adhesive layer, 6 is the upper welding edge, and 7 is the lower welding edge. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In the following examples and comparative examples:

[0032] Naphthenic oil: Model number 4006, manufactured by Hebei Oujia Lubricating Oil Co., Ltd.

[0033] Styrene-isoprene-styrene block copolymer: model number JH9620, manufacturer is Ningbo Jinhai Chenguang Chemical Co., Ltd.;

[0034] Polyisobutylene: Model number HRD-13H, manufacturer is Shandong Hongrui New Material Technology Co., Ltd.;

[0035] Amorphous α-olefin copolymer: Model number TB1403, manufacturer is Liaoyang Liaohua Qida Chemical Co., Ltd.;

[0036] Water-white hydrogenated rosin: Model number RHR-301, manufacturer is Guangxi Wuzhou Richeng Forest Products Chemical Co., Ltd.;

[0037] Velcro hook surface: 90cm wide;

[0038] Velcro loop surface layer: 90cm wide;

[0039] The polymer sheet layer is made of TPO, with a width of 100cm and a thickness of 1mm;

[0040] Adhesive waterproof layer: 90cm wide, 0.3mm thick;

[0041] Anti-stick layer: 90cm wide;

[0042] Isolation and protection sand: average particle size is 50 mesh.

[0043] Example 1

[0044] A pre-laid polymer waterproof membrane for tunnels comprises, from top to bottom, a hook and loop fastener layer, a hook and loop rough surface layer, a polymer sheet layer, an adhesive waterproof layer, and an anti-adhesive layer. An upper welded edge is provided on the upper surface of one side of the pre-laid waterproof membrane. This upper welded edge differs from the main material in that it lacks the hook and loop fastener layer and the hook and loop rough surface layer. A lower welded edge is provided on the lower surface of the other side of the welded edge. This lower welded edge differs from the main material in that it lacks the adhesive waterproof layer and the anti-adhesive layer.

[0045] The preparation method of the adhesive waterproof layer material, namely hot melt pressure-sensitive adhesive, includes the following steps:

[0046] S1. Add 10 parts naphthenic oil and 12 parts poly(ethylene butene) into a reactor, heat to 120°C, add 10 parts hydrocyanic rosin, and melt completely to obtain a mixture.

[0047] S2. When the mixture is heated to 145°C, add 20 parts of styrene-isoprene-styrene block copolymer, 5 parts of amorphous α-olefin copolymer, 0.5 parts of antioxidant 1010, 0.5 parts of anti-aging agent 4010NA and 0.5 parts of light stabilizer UV-531, and heat to 175°C until completely melted to obtain hot melt pressure-sensitive adhesive, i.e., adhesive waterproof layer material.

[0048] Example 2

[0049] A pre-laid polymer waterproof membrane for tunnels comprises, from top to bottom, a hook and loop fastener layer, a hook and loop rough surface layer, a polymer sheet layer, an adhesive waterproof layer, and an anti-adhesive layer. An upper welded edge is provided on the upper surface of one side of the pre-laid waterproof membrane. This upper welded edge differs from the main material in that it lacks the hook and loop fastener layer and the hook and loop rough surface layer. A lower welded edge is provided on the lower surface of the other side of the welded edge. This lower welded edge differs from the main material in that it lacks the adhesive waterproof layer and the anti-adhesive layer.

[0050] The preparation method of the adhesive waterproof layer material, namely hot melt pressure-sensitive adhesive, includes the following steps:

[0051] S1. Add 12 parts naphthenic oil and 13 parts poly(ethylene butene) into a reactor, heat to 120°C, add 10 parts hydrocyanic rosin, and melt completely to obtain a mixture.

[0052] S2. When the mixture is heated to 145°C, add 30 parts of styrene-isoprene-styrene block copolymer, 8 parts of amorphous α-olefin copolymer, 1 part of antioxidant 1076, 0.8 parts of anti-aging agent 4020 and 0.8 parts of light stabilizer UV-326, and heat to 180°C until completely melted to obtain hot melt pressure-sensitive adhesive, i.e., adhesive waterproof layer material;

[0053] Figure 1 This is a schematic diagram of the structure of the pre-laid polymer waterproof membrane for tunnels prepared in this embodiment.

[0054] Example 3

[0055] A pre-laid polymer waterproof membrane for tunnels comprises, from top to bottom, a hook and loop fastener layer, a hook and loop rough surface layer, a polymer sheet layer, an adhesive waterproof layer, and an anti-adhesive layer. An upper welded edge is provided on the upper surface of one side of the pre-laid waterproof membrane. This upper welded edge differs from the main material in that it lacks the hook and loop fastener layer and the hook and loop rough surface layer. A lower welded edge is provided on the lower surface of the other side of the welded edge. This lower welded edge differs from the main material in that it lacks the adhesive waterproof layer and the anti-adhesive layer.

[0056] The preparation method of the adhesive waterproof layer material, namely hot melt pressure-sensitive adhesive, includes the following steps:

[0057] S1. Add 12 parts naphthenic oil and 15 parts poly(ethylene butene) to a reaction vessel, heat to 120°C, add 10 parts hydrocyanic rosin, and melt completely to obtain a mixture.

[0058] S2. When the mixture is heated to 150°C, add 40 parts of styrene-isoprene-styrene block copolymer, 10 parts of amorphous α-olefin copolymer, 1.5 parts of antioxidant 264, 1 part of anti-aging agent RD and 1 part of light stabilizer UV-327, and heat to 185°C until completely melted to obtain hot melt pressure-sensitive adhesive, i.e., adhesive waterproof layer material.

[0059] Example 4

[0060] Compared with Example 2, Example 4 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this example, the amount of naphthenic oil added is 10 parts and the amount of poly(ethylene butene) added is 15 parts.

[0061] Example 5

[0062] Compared with Example 4, Example 5 differs in that the hot melt pressure-sensitive adhesive has different components. In this example, polyisobutylene (model HRD-13H, high-activity low-molecular-weight polyisobutylene, α-double bond mass fraction ≥80%, number average molecular weight 1200~1600) is replaced with an equal amount of polyisobutylene (model HRD-10H, high-activity low-molecular-weight polyisobutylene, α-double bond mass fraction ≥80%, number average molecular weight 900~1150), manufactured by Shandong Hongrui New Material Technology Co., Ltd.

[0063] Example 6

[0064] Compared with Example 4, Example 6 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this example, polyisobutylene (model HRD-13H, high-activity low-molecular-weight polyisobutylene, α-double bond mass fraction ≥80%, number average molecular weight 1200~1600) is replaced with an equal amount of polyisobutylene (model HRD-23H, high-activity low-molecular-weight polyisobutylene, α-double bond mass fraction ≥80%, number average molecular weight 1900~2500), manufactured by Shandong Hongrui New Material Technology Co., Ltd.

[0065] Example 7

[0066] Compared with Example 4, Example 7 differs in that the hot melt pressure-sensitive adhesive has different components. In this example, polyisobutylene (model HRD-13H, high-activity low-molecular-weight polyisobutylene, α-double bond mass fraction ≥80%, number average molecular weight 1200~1600) is replaced with an equal amount of polyisobutylene, model HRD-13, low-activity low-molecular-weight polyisobutylene, number average molecular weight 1300, manufactured by Shandong Hongrui New Material Technology Co., Ltd.

[0067] Comparative Example 1

[0068] Compared with Example 2, Comparative Example 1 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this comparative example, the amount of naphthenic oil added is 15 parts and the amount of poly(ethylene butene) added is 10 parts.

[0069] Comparative Example 2

[0070] Compared with Example 2, Comparative Example 2 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this comparative example, the amount of naphthenic oil added is 20 parts and the amount of poly(ethylene butene) added is 5 parts.

[0071] Comparative Example 3

[0072] Compared with Example 2, Comparative Example 3 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this comparative example, the amount of naphthenic oil added is 25 parts, and the amount of poly(ethylene butene) added is 0 parts.

[0073] Comparative Example 4

[0074] Compared with Example 2, Comparative Example 4 differs in that the components of the hot melt pressure-sensitive adhesive are different; in this comparative example, the amount of amorphous α-olefin copolymer added is 4 parts.

[0075] Comparative Example 5

[0076] Compared with Example 2, Comparative Example 5 differs in that the components of the hot melt pressure-sensitive adhesive are different, and the amount of amorphous α-olefin copolymer added in this comparative example is 0 parts.

[0077] Comparative Example 6

[0078] Compared with Example 2, Comparative Example 6 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this comparative example, water-white hydrogenated rosin is replaced with ordinary hydrogenated rosin.

[0079] Comparative Example 7

[0080] Compared with Example 2, Comparative Example 7 differs in that the components of the hot melt pressure-sensitive adhesive are different. In this comparative example, water-white hydrogenated rosin is replaced with ordinary rosin.

[0081] Experimental Example 1

[0082] For the pre-laid polymer waterproof membranes for tunnels prepared in Examples 1-7 and Comparative Examples 1-7, the peel strength of the samples was tested according to the test methods specified in GB / T 23457-2017 "Pre-laid Waterproof Membranes".

[0083] The test results are shown in Table 1:

[0084] Table 1 Performance test results of Examples 1-7 and Comparative Examples 1-7

[0085]

[0086] Experiment Example 2

[0087] For the pre-laid polymer waterproof membranes for tunnels prepared in Examples 1-7 and Comparative Examples 1-7, the following properties of the samples were tested according to the test methods specified in GB / T 23457-2017 "Pre-laid Waterproof Membranes".

[0088] The test results are shown in Table 2:

[0089] Table 2 Performance test results of Examples 1-7 and Comparative Examples 1-7

[0090]

[0091] As shown in Tables 1 and 2, comparing Examples 2 and 4 with Comparative Examples 1 to 3, it can be seen that as the amount of naphthenic oil decreases and the amount of polyisobutylene increases, the softening point, heat resistance, and peel strength of the pre-laid polymer waterproof membrane for tunnels all improve. This indicates that when the amount of naphthenic oil added is less than the amount of polyisobutylene added, the peel strength of the pre-laid polymer waterproof membrane for tunnels can be improved.

[0092] Compared with Comparative Examples 4 and 5, in Example 2, as the amount of amorphous α-olefin copolymer decreased, the heat resistance and softening point of the pre-laid polymer waterproof membrane for tunnels also decreased significantly, and the peel strength after heat treatment and immersion in water showed a greater decrease than that without treatment; compared with Comparative Examples 6 and 7, in Example 2, it was found that water-white hydrogenated rosin had a significantly better effect on the thickening and stabilization of the system than hydrogenated rosin and ordinary rosin.

[0093] A comparison of Examples 4 and 5-7 shows that when the polyisobutylene is a highly active low-molecular-weight polyisobutylene with a number-average molecular weight of 1200-1600, the peel strength and heat resistance of the pre-laid polymer waterproof membrane for tunnels can be further improved.

[0094] The above are merely 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 within the protection scope of the present invention.

Claims

1. A pre-laid polymer waterproof membrane for tunnels, characterized in that, From top to bottom, the layers consist of a hook and loop fastener layer, a polymer sheet layer, an adhesive waterproof layer, and an anti-stick layer. The adhesive waterproof layer is a hot-melt pressure-sensitive adhesive, which comprises the following components by weight: 10-15 parts naphthenic oil, 20-40 parts styrene-isoprene-styrene block copolymer, 10-15 parts polyisobutylene, 5-10 parts amorphous α-olefin copolymer, 10-20 parts water-white hydrogenated rosin, 0.5-1.5 parts antioxidant, 0.5-1 part anti-aging agent, and 0.5-1 part light stabilizer. The amount of naphthenic oil added is less than the amount of polyisobutylene added. The polyisobutylene is a highly active low-molecular-weight polyisobutylene, wherein the mass fraction of α-double bonds in the highly active low-molecular-weight polyisobutylene is ≥80%, and the number average molecular weight is 1200~1600.

2. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The polymer sheet layer is made of one of the following materials: EVA, HDPE, CPE, PE, EPDM, and TPO.

3. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The material of the anti-stick layer includes one of the following: cloth, film, and mineral particles.

4. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The structure of the styrene-isoprene-styrene block copolymer includes one or more of linear, star-shaped, and star-line hybrid structures, and the styrene content of the styrene-isoprene-styrene block copolymer is 14wt%~29wt%.

5. The pre-laid polymer waterproof membrane for tunnels according to claim 4, characterized in that, When the structure of the styrene-isoprene-styrene block copolymer is a star-line mixed type, the styrene content is 14wt%, the diblock content is 12wt%, the melt mass flow rate is 9g / 10min, and the test conditions are 200℃ / 5kg.

6. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The antioxidants include one or more of antioxidants 1010, antioxidant 1076, and antioxidant 264.

7. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The antioxidant includes one or more of antioxidant 4010NA, antioxidant 4020, and antioxidant RD.

8. The pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The light stabilizer includes one or more of the following: UV-531, UV-326, and UV-327.

9. A pre-laid polymer waterproof membrane for tunnels according to claim 1, characterized in that, The preparation method of the hot melt pressure-sensitive adhesive includes the following steps: S1. Add the naphthenic oil and the polyisobutylene into a reaction vessel, heat to 120°C, add the water-white hydrogenated rosin, and melt completely to obtain a mixture; S2. When the mixture is heated to 145~150℃, the styrene-isoprene-styrene block copolymer, amorphous α-olefin copolymer, antioxidant, anti-aging agent and light stabilizer are added, and the temperature is raised to 175~185℃ to completely melt and obtain the hot melt pressure-sensitive adhesive.

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