A modified TPO coil and its preparation method and application

Abstract

The present invention discloses a modified TPO roll, a preparation method thereof, and an application thereof. The modified TPO roll comprises a first layer, a second layer, and a third layer arranged in sequence. The raw material of the first layer comprises a first thermoplastic polyolefin resin; the first thermoplastic polyolefin resin accounts for more than 70% of the raw material of the first layer in terms of mass percentage; the raw material of the second layer comprises a second thermoplastic polyolefin resin, an active filler, and cement; and the raw material of the third layer comprises polyvinyl alcohol, hydroxyalkyl cellulose, and water. In the process of preparing the modified TPO roll, the first and second layers are first extruded and compounded, and the third layer is formed by mixing the raw materials thereof, applying the mixed materials to the second layer having a preset temperature, and controlling the preset temperature to evaporate and remove water in the raw material of the third layer. The modified TPO roll of the present invention can not only achieve excellent bonding with a concrete matrix, but also improve the performance of the concrete matrix.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof materials, and in particular to a modified TPO coiled material and a preparation method and application thereof. Background Art

[0002] TPO waterproof membrane is thermoplastic polyolefin waterproof membrane. Usually, it is a waterproof membrane made of thermoplastic polyolefin (TPO) synthetic resin as the base material and antioxidants and other additives. It has the characteristics of both rubber and thermoplastic plastics. It shows high elasticity of rubber at room temperature and can be plasticized and formed at high temperature. It has the characteristics of anti-aging, construction on wet roofs, and easy construction. It is a commonly used waterproof layer for environmentally friendly buildings in the domestic building waterproofing industry in recent years.

[0003] At present, thermoplastic polyolefin (TPO) waterproof membranes are usually fixed to concrete using hot melt adhesive or rivets. However, practice has found that the hot melt adhesive fixation method not only places high demands on the bonding strength of the hot melt adhesive, but also the durability of the bond is limited by the life of the hot melt adhesive. Generally, hot melt adhesives have the defect of a short service life. The rivet fixation method is difficult to use rivets in all positions. Even if rivets are used in most positions, not only is the construction cost high, but the surrounding parts of the rivet fixing positions are difficult to achieve close fit with the concrete, which poses a natural risk of water leakage. Summary of the Invention

[0004] The object of the present invention is to overcome one or more deficiencies in the prior art and to provide an improved modified TPO membrane that can achieve excellent bonding with concrete without using hot melt adhesive or rivets.

[0005] The present invention also provides a method for preparing the modified TPO coil.

[0006] The present invention also provides an application of the modified TPO membrane in waterproof construction.

[0007] In order to achieve the above object, a technical solution adopted by the present invention is:

[0008] A modified TPO coiled material, comprising a first layer, a second layer and a third layer arranged in sequence;

[0009] The raw material of the first layer comprises a first thermoplastic polyolefin resin; the amount of the first thermoplastic polyolefin resin added accounts for more than 70% of the raw material of the first layer in terms of mass percentage;

[0010] The raw materials of the second layer include a second thermoplastic polyolefin resin, an active filler and cement;

[0011] The raw materials of the third layer include polyvinyl alcohol (PVA), hydroxyalkyl cellulose and water;

[0012] In the process of preparing the modified TPO membrane, the third layer is formed by mixing the raw materials thereof and then applying the mixed materials onto the second layer at a preset temperature, and controlling the preset temperature to evaporate and remove water in the raw materials of the third layer.

[0013] In some embodiments of the present invention, the preset temperature is controlled to evaporate and remove water in the raw material of the third layer within 10 seconds.

[0014] Furthermore, the preset temperature is controlled to evaporate and remove water in the raw materials of the third layer within 5 seconds, and further controlled to be within 3 seconds.

[0015] According to some preferred aspects of the present invention, the preset temperature is greater than 110°C, more preferably greater than 120°C, and further preferably greater than 130°C.

[0016] In some preferred embodiments of the present invention, the preset temperature is 135-150°C.

[0017] According to a specific aspect of the present invention, the preset temperature is 140°C.

[0018] According to some preferred aspects of the present invention, before applying the raw materials of the third layer onto the second layer, the mixed liquid of the raw materials of the third layer is controlled to be at a temperature of 85-95°C.

[0019] Furthermore, before applying the raw materials of the third layer onto the second layer, the mixed liquid of the raw materials of the third layer is controlled to be at a temperature of 90-95°C.

[0020] According to some preferred and specific aspects of the present invention, in terms of mass percentage, the raw materials of the third layer comprise 4%-29% polyvinyl alcohol, 0.1%-2% hydroxyalkyl cellulose, and 70%-95% water.

[0021] Furthermore, in terms of percentage by mass, the raw materials of the third layer comprise 10%-25% of polyvinyl alcohol, 0.3%-1.0% of hydroxyalkyl cellulose, and 74%-90% of water.

[0022] According to some preferred and specific aspects of the present invention, in terms of mass percentage, the raw materials of the second layer include 30%-55% of the second thermoplastic polyolefin resin, 5%-15% of the active filler, 30%-55% of the cement, 0-0.5% of the air entraining agent, and 0-2.0% of the antioxidant.

[0023] Furthermore, in terms of mass percentage, the raw materials of the second layer include 30%-55% of the second thermoplastic polyolefin resin, 5%-15% of the active filler, 30%-55% of the cement, 0.1%-0.25% of the air entraining agent, and 0.3%-2.0% of the antioxidant.

[0024] According to some preferred and specific aspects of the present invention, the raw materials for the first layer further comprise titanium dioxide, a light stabilizer and an antioxidant;

[0025] In terms of mass percentage, the raw materials of the first layer include 80%-90% of the first thermoplastic polyolefin resin, 5%-18% of titanium dioxide, 0.5%-2.5% of light stabilizer, and 0.3%-2.5% of antioxidant.

[0026] In some embodiments of the present invention, the modified TPO membrane further includes an overlapping edge provided on the second layer.

[0027] In some embodiments of the present invention, the hydroxyalkyl cellulose is hydroxyethyl cellulose.

[0028] According to some preferred and specific aspects of the present invention, the active filler is metakaolin. Further, in some embodiments, the mesh size of the metakaolin can be 2000-4000 mesh, or 2500-3500 mesh.

[0029] In some embodiments, the cement may be PII Portland cement, and its mesh size may be 800-2000 mesh, or 1000-1500 mesh.

[0030] In some embodiments, the air entraining agent is an anionic surfactant, a nonionic surfactant, or a combination of both. In some embodiments, the light stabilizer includes one or more of carbon black, hindered amine derivatives, zinc dioxide, and metal complexes.

[0031] In some embodiments, the antioxidant in the raw materials of the first layer or the second layer includes: amine antioxidants, phenolic antioxidants, etc.

[0032] In some embodiments, the modified TPO membrane of the present invention is preferably sealed and stored to remove moisture.

[0033] In the present invention, the first layer can be exposed or combined with other roll materials.

[0034] Another technical solution provided by the present invention is a method for preparing the modified TPO coil described above, the method comprising:

[0035] heating the water in the raw material of the third layer, then adding the polyvinyl alcohol, mixing, and then adding the hydroxyalkyl cellulose, mixing, and keeping warm to obtain a mixed solution;

[0036] After the raw materials of the first layer and the raw materials of the second layer are extruded and compounded, an intermediate body composed of the first layer and the second layer is formed, the temperature of the intermediate body is controlled to be at the preset temperature, and then the obtained mixed liquid is applied to the intermediate body at the preset temperature. The preset temperature can evaporate and remove the water in the raw materials of the third layer, thereby forming the third layer on the second layer.

[0037] In some embodiments of the present invention, the water in the raw material of the third layer may be deionized water.

[0038] In some embodiments of the present invention, the method for preparing the mixed solution includes:

[0039] Add water to the heating kettle, raise the temperature to 85-95°C, add polyvinyl alcohol, stir and mix, add hydroxyalkyl cellulose, maintain the temperature during the process, disperse evenly and keep warm for use.

[0040] In some embodiments of the present invention, the raw materials for the first layer and the second layer are simultaneously extruded and composited on a three-roll calender to form an intermediate composite of the first and second layers. Furthermore, in actual operation, since the temperature of the immediately extruded intermediate is relatively high, the preset temperature can be substantially reached without heating (sometimes cooling may be necessary).

[0041] In some embodiments of the present invention, the amount of the mixed liquid applied to the second layer is 0.1-0.5 kg / m 2 .

[0042] In some embodiments of the present invention, after the obtained mixed liquid is applied to the intermediate at the preset temperature, it is cooled by air supply and then rolled up for packaging.

[0043] Another technical solution provided by the present invention is: an application of the modified TPO membrane described above in waterproofing construction, the application comprising: wet-laying the modified TPO membrane described above on a concrete substrate; during the wet-laying process, the polyvinyl alcohol and hydroxyalkyl cellulose in the third layer independently penetrate into the second layer and the concrete substrate under the action of water added during the wet-laying process, until the second layer is in contact with the concrete substrate.

[0044] Furthermore, in some embodiments of the present invention, when in use, concrete can be poured on the third layer to achieve bonding between the waterproof membrane and the concrete substrate; or the waterproof membrane can be wet-laid on a freshly poured concrete substrate.

[0045] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0046] Based on the defects in the prior art that thermoplastic polyolefin (TPO) waterproof membranes are usually fixed to concrete using hot melt adhesives or rivets, the inventors of the present invention have innovatively provided an improved TPO membrane to solve the defects in the prior art. The TPO membrane includes a first layer that can be used for exposure and / or combination with other membranes, a cement-modified TPO layer - a second layer for direct contact with concrete in the later stage, and a third layer for temporarily sealing the second layer. In the present invention, the third layer uses polyvinyl alcohol and hydroxyalkyl cellulose as film-forming materials, which can be mixed in water in the initial stage and then evenly applied to the second layer. After rapid water loss, a sealing layer is formed. Since the second layer contains powders such as cement and metakaolin, one of the functions of the sealing layer at this time is to better seal the second layer. The sealing effect is achieved by sealing the second layer, thereby keeping the second layer stable and preventing powder from falling off. During later construction and use, since the polyvinyl alcohol and hydroxyalkyl cellulose in the third layer are both soluble in water, wet construction can be adopted. Under the action of water, the polyvinyl alcohol and hydroxyalkyl cellulose in the third layer can be brought into the concrete matrix and the second layer until the third layer is substantially or completely disappeared (i.e., substantially entered into the concrete matrix and the second layer). The third layer loses its sealing effect, and the second layer is exposed and can directly contact the concrete matrix. The raw materials of the second layer of the present invention contain cement and active fillers, which will gel under the action of water and eventually form a concrete structure. Excellent bonding and fixation can be achieved between the two concrete structures, that is, the purpose of fixing the coiled material to the concrete matrix is ​​achieved.

[0047] In particular, in the present invention, firstly, by fixing the coiled material on the concrete base as described above, a close fit and combination of the coiled material and the concrete base can be achieved, the combination life is long, and the hidden danger of water leakage existing in the rivet fixing method can be avoided;

[0048] Second, the polyvinyl alcohol and hydroxyalkyl cellulose that penetrate into the second layer and the concrete matrix are polymers themselves, which can further increase the bonding stability inside the concrete and effectively prevent the occurrence of micro cracks;

[0049] Third, the present invention innovatively uses polyvinyl alcohol and hydroxyalkyl cellulose as composite film-forming agents. Since hydroxyalkyl cellulose can be quickly dissolved in water, while polyvinyl alcohol dissolves relatively slowly in water at relatively low temperatures, the present invention proposes for the first time to utilize the ability of hydroxyalkyl cellulose to dissolve quickly in water, so that it can dissolve quickly in water under the action of water, and then open the path closed by it, so that water and subsequent polyvinyl alcohol can enter the concrete matrix or the second layer to develop a channel, which is conducive to the penetration of water and polyvinyl alcohol. Polyvinyl alcohol has a water-retaining effect. After entering the concrete, it can slowly release water, making the hydration inside the concrete more thorough. DETAILED DESCRIPTION

[0050] The above scheme is further described below in conjunction with specific examples; it should be understood that these examples are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following examples; the implementation conditions adopted in the examples can be further adjusted according to specific requirements, and the implementation conditions not specified are generally the conditions in routine experiments.

[0051] Unless otherwise specified in the following examples, all raw materials were purchased from commercial sources or prepared by conventional methods in the art.

[0052] In the following, the first and second thermoplastic polyolefin resins are added to distinguish different layers, and are thermoplastic polyolefin resins purchased from Basel, brand CA10A; titanium dioxide is purchased from Longman, brand Longman Billions R996; the light stabilizer is a hindered amine light stabilizer purchased from BASF, brand HS-944; the antioxidant is 2,6-di-tert-butyl-4-methylphenol, purchased from Shanghai Lingrui Chemical Co., Ltd., brand antioxidant 264; 3000 mesh kaolin Soil was purchased from Shanxi Jinyu Kelin Technology Co., Ltd. with the brand name BRITEX-95; 1200 mesh PII silicate cement was purchased from Guangzhou Jinyang Cement with the brand name PII42.5R silicate cement; the air-entraining agent was a composite of anionic surfactant and nonionic surfactant, purchased from Nanjing Qinghai Trading Co., Ltd. with the brand name Solvay powdered air-entraining agent 1420; polyvinyl alcohol PVA0588 was purchased from Sichuan Wei Chemical with the brand name PVA0588; and hydroxyethyl cellulose was purchased from Aqualon with the brand name 250HBR.

[0053] Example 1

[0054] This example provides a modified TPO coil and a preparation method thereof, wherein the modified TPO coil comprises a first layer, a second layer and a third layer arranged in sequence;

[0055] Calculated by mass percentage, the raw material of the first layer comprises 80% of a first thermoplastic polyolefin resin, 15.5% of titanium dioxide, 2.5% of a light stabilizer, and 2% of an antioxidant;

[0056] Calculated by mass percentage, the raw materials of the second layer include 45% of a second thermoplastic polyolefin resin, 10% of 3000 mesh metakaolin, 42.9% of 1200 mesh PII Portland cement, 0.1% of an air entraining agent, and 2% of an antioxidant;

[0057] Calculated by mass percentage, the raw materials of the third layer include 15% PVA0588, 0.3% hydroxyethyl cellulose, and 84.7% water.

[0058] The preparation method of the modified TPO coil comprises the following steps: adding water to a heating kettle, heating the kettle to 95° C., adding PVA0588 and stirring for 2 hours, adding hydroxyethyl cellulose, maintaining the temperature between 90° C. and 95° C., uniformly dispersing the mixture to obtain a mixed solution, and keeping the mixture warm for later use; simultaneously extruding and compounding the raw materials of the first layer and the second layer on a three-roll calender (extrusion process parameters: material zone temperature 180° C., main machine die head temperature controlled at 200° C., first roller temperature 140° C., second roller temperature 160° C., and third roller temperature 140° C.), aligning one end of the first layer with that of the second layer, and leaving a 10 cm overlap edge on the second layer to form an intermediate composite of the first and second layers, wherein the temperature of the intermediate is approximately 140° C.; then directly spraying the mixed solution at a temperature of approximately 90° C. onto the second layer, with a dosage of 0.3 kg per square meter; passing through a 3-meter air supply cooling and volatilization zone, and then winding and packaging.

[0059] Performance test: The prepared modified TPO membrane product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017, and the performance requirements of Class P were met. The results are shown in Table 1.

[0060] Example 2

[0061] This example provides a modified TPO coil and a preparation method thereof, wherein the modified TPO coil comprises a first layer, a second layer and a third layer arranged in sequence;

[0062] Calculated by mass percentage, the raw material of the first layer comprises 90% of a first thermoplastic polyolefin resin, 5.5% of titanium dioxide, 2.5% of a light stabilizer, and 2% of an antioxidant;

[0063] Calculated by mass percentage, the raw materials of the second layer include 30% of a second thermoplastic polyolefin resin, 13.75% of 3000 mesh metakaolin, 55% of 1200 mesh PII Portland cement, 0.25% of an air entraining agent, and 1% of an antioxidant;

[0064] Calculated by mass percentage, the raw materials of the third layer include 25% PVA0588, 1% hydroxyethyl cellulose, and 74% water.

[0065] The preparation method of the modified TPO coil is the same as that of Example 1.

[0066] Performance test: The prepared modified TPO membrane product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017, and the performance requirements of Class P were met. The results are shown in Table 1.

[0067] Example 3

[0068] This example provides a modified TPO coil and a preparation method thereof, wherein the modified TPO coil comprises a first layer, a second layer and a third layer arranged in sequence;

[0069] Calculated by weight percentage, the raw material of the first layer comprises 85% of a first thermoplastic polyolefin resin, 12.5% ​​of titanium dioxide, 1.5% of a light stabilizer, and 1% of an antioxidant;

[0070] Calculated by mass percentage, the raw materials of the second layer include 55% of a second thermoplastic polyolefin resin, 12.75% of 3000 mesh metakaolin, 30% of 1200 mesh PII Portland cement, 0.25% of an air entraining agent, and 2% of an antioxidant;

[0071] Calculated by mass percentage, the raw materials of the third layer include 10% PVA0588, 1% hydroxyethyl cellulose, and 89% water.

[0072] The preparation method of the modified TPO coil is the same as that of Example 1.

[0073] Performance test: The prepared modified TPO membrane product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017, and the performance requirements of Class P were met. The results are shown in Table 1.

[0074] Comparative Example 1

[0075] This example provides a TPO coiled material, which is basically the same as Example 3, except that it does not have a third sealing treatment layer.

[0076] Performance test: After the coil comes off the line, there is severe powder loss, and the products off the line are damaged and cannot meet the process requirements of the production site.

[0077] Comparative Example 2

[0078] This example provides a TPO membrane, which is basically the same as Example 3, except that there is no third layer and no 3000 mesh metakaolin is added to the second layer. Accordingly, the addition amount of the second thermoplastic polyolefin resin is adjusted to 77.75%, and the addition amount of 1200 mesh PII Portland cement is adjusted to 20%.

[0079] Performance test: The prepared product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017. The product could not effectively bond with the cement mortar and did not meet the P-type performance requirements. The results are shown in Table 1.

[0080] Comparative Example 3

[0081] This example provides a TPO membrane, which is basically the same as Example 3, except that the third layer is replaced with 50% acrylic emulsion FS-7056 (solid content 54±1%, purchased from Badfu Industrial Co., Ltd.) and 50% water.

[0082] Performance test: The prepared product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017. The adhesion was greatly reduced and did not meet the P-type performance requirements. The results are shown in Table 1.

[0083] Comparative Example 4

[0084] This example provides a TPO membrane, essentially the same as Example 3, except that hydroxyethyl cellulose was omitted from the raw materials for the third layer, and the PVA0588 dosage was adjusted to 11%. Using the minimum sealant dosage of 0.3 kg / m2, spraying resulted in the sealant layer (the third layer) flowing during production, failing to meet production process requirements.

[0085] Comparative Example 5

[0086] This example provides a TPO membrane, essentially the same as Example 3, differing only in that PVA0588 is omitted from the raw materials for the third layer, and the hydroxyethyl cellulose content is adjusted to 3%. The material for the sealing layer (the third layer) has a high viscosity, making spraying difficult during production. Furthermore, the low material content prevents effective sealing, resulting in powder shedding after production.

[0087] Performance test: The prepared product was wet-laid with a polymer-modified cement-based waterproof coating that meets the GB / T23445 standard or the JC / T2090 and JC / T984 standards to prepare samples. The peeling strength with the post-poured concrete was tested according to GBT23457-2017. The adhesion was greatly reduced and did not meet the P-type performance requirements. The results are shown in Table 1.

[0088] Performance Testing

[0089] The modified TPO membranes prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to the following performance tests, and the specific results are shown in Table 1.

[0090] Table 1

[0091]

[0092]

[0093] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

[0094] The endpoints of the ranges and any values ​​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 endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

Claims

1. A modified TPO coil, characterized in that: The modified TPO coil comprises a first layer, a second layer and a third layer which are arranged in sequence; The raw material of the first layer comprises a first thermoplastic polyolefin resin; the amount of the first thermoplastic polyolefin resin added accounts for more than 70% of the raw material of the first layer in terms of mass percentage; The raw materials of the second layer include a second thermoplastic polyolefin resin, an active filler and cement; The raw materials of the third layer include polyvinyl alcohol, hydroxyalkyl cellulose and water; In the process of preparing the modified TPO membrane, the third layer is formed by mixing the raw materials thereof and then applying the mixed materials onto the second layer at a preset temperature, and controlling the preset temperature to evaporate and remove water in the raw materials of the third layer.

2. The modified TPO coil according to claim 1, characterized in that: The preset temperature is controlled to evaporate and remove water in the raw material of the third layer within 10 seconds.

3. The modified TPO coil according to claim 2, characterized in that: The preset temperature is controlled to evaporate and remove water in the raw material of the third layer within 5 seconds.

4. The modified TPO coil according to claim 3, characterized in that: The preset temperature is controlled to evaporate and remove water in the raw material of the third layer within 3 seconds.

5. The modified TPO membrane according to any one of claims 1 to 4, characterized in that: The preset temperature is greater than 110°C.

6. The modified TPO coil according to claim 5, characterized in that: The preset temperature is greater than 120°C.

7. The modified TPO coil according to claim 6, characterized in that: The preset temperature is greater than 130°C.

8. The modified TPO coil according to claim 1, characterized in that: The preset temperature is 135-150°C.

9. The modified TPO coil according to claim 1, characterized in that: Before applying the raw materials of the third layer onto the second layer, the mixed liquid of the raw materials of the third layer is controlled to be at a temperature of 85-95°C.

10. The modified TPO membrane according to claim 9, characterized in that: Before applying the raw materials of the third layer onto the second layer, the mixed liquid of the raw materials of the third layer is controlled to be at a temperature of 90-95°C.

11. The modified TPO membrane according to claim 1, characterized in that: Calculated by mass percentage, in the raw materials of the third layer, polyvinyl alcohol accounts for 4%-29%, hydroxyalkyl cellulose accounts for 0.1%-2%, and water accounts for 70%-95%.

12. The modified TPO membrane according to claim 11, characterized in that: Calculated by mass percentage, in the raw materials of the third layer, polyvinyl alcohol accounts for 10%-25%, hydroxyalkyl cellulose accounts for 0.3%-1.0%, and water accounts for 74%-89%.

13. The modified TPO membrane according to claim 1, characterized in that: Calculated by mass percentage, the raw materials of the second layer include 30%-55% of the second thermoplastic polyolefin resin, 5%-15% of the active filler, 30%-55% of the cement, 0-0.5% of the air entraining agent, and 0-2.0% of the antioxidant.

14. The modified TPO membrane according to claim 13, characterized in that: Calculated by mass percentage, the raw materials of the second layer include 30%-55% of the second thermoplastic polyolefin resin, 5%-15% of the active filler, 30%-55% of the cement, 0.1%-0.25% of the air entraining agent, and 0.3%-2.0% of the antioxidant.

15. The modified TPO membrane according to claim 1, characterized in that: The raw materials of the first layer also include titanium dioxide, light stabilizer and antioxidant; In terms of mass percentage, the raw materials of the first layer include 80%-90% of the first thermoplastic polyolefin resin, 5%-18% of titanium dioxide, 0.5%-2.5% of the light stabilizer, and 0.3%-2.5% of the antioxidant.

16. The modified TPO membrane according to claim 1, characterized in that: The modified TPO membrane further includes an overlapping edge arranged on the second layer.

17. The modified TPO membrane according to claim 1, characterized in that: The hydroxyalkyl cellulose is hydroxyethyl cellulose.

18. The modified TPO membrane according to claim 1, characterized in that: The active filler is metakaolin.

19. A method for preparing the modified TPO coil according to any one of claims 1 to 18, characterized in that: The preparation method comprises: heating the water in the raw material of the third layer, then adding the polyvinyl alcohol, mixing, and then adding the hydroxyalkyl cellulose, mixing, and keeping warm to obtain a mixed solution; After the raw materials of the first layer and the raw materials of the second layer are extruded and compounded, an intermediate body composed of the first layer and the second layer is formed, the temperature of the intermediate body is controlled to be at the preset temperature, and then the obtained mixed liquid is applied to the intermediate body at the preset temperature. The preset temperature can evaporate and remove the water in the raw materials of the third layer, thereby forming the third layer on the second layer.

20. Use of the modified TPO membrane according to any one of claims 1 to 18 in waterproof construction, characterized in that: The application comprises: wet-laying the modified TPO membrane according to any one of claims 1 to 18 on a concrete substrate; during the wet-laying process, the polyvinyl alcohol and hydroxyalkyl cellulose in the third layer independently penetrate into the second layer and the concrete substrate under the action of water added during the wet-laying process, until the second layer is in contact with the concrete substrate.

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