A method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane

Abstract

A method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane; the waterproof membrane has a four-layer structure: a bottom layer containing a degrading agent EPDM waterproof layer, a middle layer containing a modified polymer waterproof layer with recycled particles, a reinforcing waterproof layer without recycled particles, and a cement mortar surface layer. This invention improves the service life of recycled materials. By using an EPDM waterproof layer containing a degrading agent, the waterproof membrane begins to degrade after 50-70 years, giving the product durability, flexibility, and environmental friendliness.

Description

Technical Field

[0001] This application relates to the field of waterproof membrane processing technology, and more specifically, to a method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane. Background Technology

[0002] On October 24, 2022, the Ministry of Housing and Urban-Rural Development issued a document approving the "General Specification for Waterproofing of Buildings and Municipal Engineering" (GB55030-2022), which will be implemented from April 1, 2023. The specification stipulates that the design life of underground engineering projects shall not be less than the design life of the engineering structure, and that pre-laid reverse-adhesive waterproof membranes for underground structures must be changed from one layer to two layers to extend the service life of the waterproofing, making it the same as the lifespan of the underground structure. However, adopting two layers of waterproofing not only increases costs but also adds the need for handling the pre-laid waterproof membrane after its service life expires.

[0003] Recycled materials can be recycled and reused multiple times, but their lifespan is short, increasing carbon emissions. Recycled materials used in underground pre-laid waterproof membranes typically have a lifespan of 50-70 years, reducing carbon emissions. The final disposal methods for both recycled and virgin plastic materials are landfill or incineration, which pollute the environment and result in large carbon emissions over their entire life cycle.

[0004] Therefore, it is necessary for the inventors to develop a new type of waterproof membrane to overcome the above problems. Summary of the Invention

[0005] The main purpose of this application is to provide a method for preparing a biodegradable pre-laid reverse adhesive polymer waterproof membrane, which has durability, flexibility and environmental friendliness.

[0006] To achieve the above objectives, in a first aspect, this application provides a method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane, comprising the following steps:

[0007] S1. Processing technology of the bottom waterproof layer: 30.0~40.0 parts of EPDM rubber, 5.0~15.0 parts of TPR thermoplastic rubber, 5.0~10.0 parts of pretreatment degradation agent, 5.0~10.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture is fed into the extruder to prepare the bottom waterproof layer.

[0008] S2. Intermediate waterproof layer processing technology: 60.0~80.0 parts of pretreated recycled PE, 20.0~30.0 parts of polyethylene, 1.0~5.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture is fed into the extruder to prepare the intermediate waterproof layer.

[0009] S3. Enhanced waterproof layer processing technology: 50.0~70.0 parts of first polyethylene, 20.0~30.0 parts of second polyethylene, 5.0~10.0 parts of polypropylene, 5.0~10.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture enters the extruder to prepare the enhanced waterproof layer. The density of the first polyethylene is less than the density of the second polyethylene.

[0010] S4. Composite sheet forming process: The bottom waterproof layer, the middle waterproof layer and the reinforcing waterproof layer are sequentially laminated together by a calendering machine to prepare a polymer composite sheet.

[0011] S5. Apply adhesive and sprinkle sand: Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the polymer composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.3mm~0.4mm. Then, sprinkle cement sand on the adhesive layer.

[0012] A further improvement is that the preparation method of the pretreatment degradation agent includes mixing polyhydroxy fatty acid ester, polycaprolactone, and dodecyltriethoxysilane in a container at a weight percentage of 60:30:10, and allowing the mixture to stand for 1 day.

[0013] A further improvement is that the preparation method of the pretreated PE recycled material includes mixing the PE recycled material and silane coupling agent in a container at a weight percentage of 95:5, and allowing the mixture to stand for 1 day.

[0014] A further improvement is that the method for preparing the cement sand includes adding 40.0~50.0 parts of white cement, 10.0~15.0 parts of penetrating crystallizing masterbatch, and 20.0~30.0 parts of 800-mesh quartz sand by weight percentage to a mortar mixer, mixing for 30 minutes, and then discharging to produce cement sand.

[0015] A further improvement is that the surface of the reinforced waterproof layer of the polymer composite sheet is completely coated with pressure-sensitive hot melt adhesive, the area covered by the cement mortar is smaller than the surface area of ​​the polymer composite sheet, and the distance between the edge of the cement mortar and the edge of the polymer composite sheet is 80mm.

[0016] A further improvement is that the extrusion process of the extruder in steps S1, S2, and S3 includes using a twin-screw extruder, controlling the barrel temperature at 190℃~210℃, controlling the die temperature of the extruded material at 190℃~200℃, and the traction speed at 5m / min.

[0017] A further improvement is that the thickness of the bottom waterproof layer is 0.3mm~0.4mm, the thickness of the middle waterproof layer is 0.3mm~0.4mm, and the thickness of the reinforced waterproof layer is 0.3mm~0.4mm.

[0018] A further improvement is that in step S4, the bottom waterproof layer, the middle waterproof layer, and the reinforced waterproof layer are laminated together by a three-roll calender.

[0019] A further improvement is that in step S5, cement sand is spread at a rate of 500g per square meter.

[0020] The present invention provides a method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane, which, compared with the prior art, has the following advantages:

[0021] (1) Improved waterproofing effect: The excellent properties of polymer materials can effectively prevent water penetration and improve the waterproofing performance of buildings.

[0022] (2) Increased service life: By adding high-strength polypropylene and antioxidants, the puncture and tear resistance of the roll material is improved, thus extending its service life.

[0023] (3) Improve carbon fixation life: By using recycled materials in a polymer pre-laid reverse adhesive waterproof membrane with a service life of 50-70 years, the carbon fixation life of PE recycled materials is improved.

[0024] (4) Environmentally friendly and biodegradable: The composite use of biodegradable agent (polyhydroxyalkanoate PHA) and hydrolytic degradable agent (polycaprolactone PCL) allows the polymer material to undergo biological and water degradation after the waterproof membrane reaches its service life. This is environmentally friendly and meets the requirements of sustainable development.

[0025] (5) Inorganic rigid self-waterproofing: After the service life of the pre-laid waterproof membrane, the membrane has degraded or begun to degrade, and its performance has declined. At this time, underground waterproofing mainly relies on the formation of a dense inorganic waterproof layer and structural self-waterproofing concrete. The service life of underground structure waterproofing is the same as that of underground structure. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0027] Figure 1 This is a schematic diagram of waterproof membrane.

[0028] The structure consists of: 1. bottom waterproof layer; 2. middle waterproof layer; 3. reinforced waterproof layer; and 4. cement mortar surface layer. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] In addition, the term "multiple" should mean two or more.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figure 1As shown, the waterproof membrane prepared by the present invention comprises a four-layer structure: a bottom waterproof layer 1 containing a degradation agent EPDM waterproof layer, an intermediate waterproof layer 2 containing a modified polymer waterproof layer with recycled particles, a reinforcing waterproof layer 3 containing a modified polymer waterproof layer without recycled particles, and a cement mortar surface layer 4.

[0036] The technical principle is as follows:

[0037] (1) The degradation agent can only be placed in EPDM. EPDM itself is a material with good weather resistance and aging resistance. Its general service life is 70 years. The degradation agent modified by macromolecular silane is placed in the bottom layer. After 70 years, the performance of the bottom waterproofing begins to decline. The degradation agent degrades the pre-laid waterproof membrane through the process of degrading the bottom layer, the middle layer and the reinforced waterproof layer.

[0038] (2) The bottom layer contains a EPDM waterproof layer containing a degradation agent, and a combination of a biodegradable agent (polyhydroxyalkanoate PHA) and a hydrolytic degradation agent (polycaprolactone PCL) is used. The degradation agent is surface-sealed with hydrophobic treatment by macromolecular silane to prolong the time for the degradation agent to start to take effect.

[0039] (3) The intermediate layer contains a modified polymer waterproof layer with recycled particles. The recycled particles are PE-type recycled materials. Since the performance of recycled materials is unstable, we use silane coupling agent to pretreat the recycled materials. The recycled materials and silane coupling agent can react chemically to form chemical bonds, thereby improving the performance stability of the recycled materials. At the same time, it also improves the adhesion between the bottom layer and the reinforced waterproof layer.

[0040] (4) Strengthen the waterproof layer with modified polymer waterproof layer containing native particles. By using high-strength polypropylene, the impact resistance and puncture resistance of the sheet are improved, and the roll is prevented from being punctured by steel bars during construction and punctured by plant roots during use.

[0041] (5) The cement mortar layer uses white cement containing penetrating crystallizing masterbatch and 800-mesh quartz sand. Its function is to act as a separating material to prevent the adhesive roll from sticking to the surface. The white cement mortar containing penetrating crystallizing masterbatch reacts with the post-poured concrete to form a dense inorganic waterproof layer.

[0042] (6) The purpose of using recycled particles and plastic degrading agents in this invention is to slowly degrade these polymer plastic sheets after the service life of the pre-laid waterproof membrane, while meeting the underground waterproof requirements. At the same time, the use of recycled particles increases the carbon fixation time of the recycled particles.

[0043] (7) After the service life of the pre-laid waterproof membrane has expired, the membrane has degraded or begun to degrade, and its performance has declined. At this time, underground waterproofing mainly relies on the formation of a dense inorganic waterproof layer and structural self-waterproofing concrete.

[0044] The specific preparation method is as follows:

[0045] Example 1:

[0046] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and dodecyltriethoxysilane (60:30:10) evenly in a container. Then, let the mixture stand for 1 day to complete the silane end-capping pretreatment of the degradation agent.

[0047] 30.0 parts of EPDM rubber, 15.0 parts of TPR thermoplastic rubber, 10.0 parts of pretreatment degradation agent, 5.0 parts of calcium carbonate masterbatch, 1.0 part of color masterbatch and 5.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0048] Intermediate waterproof layer forming steps: First, mix PE recycled material and KH-560 silane coupling agent in a container at a ratio of 95:5. Then, let the mixture stand for 1 day to complete the pretreatment of PE recycled material.

[0049] 60.0 parts of pretreated recycled PE, 25.0 parts of 6098 high-density polyethylene, 5.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch and 1.0 part of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~210℃, the die temperature of the extruded material was controlled at 190℃~200℃, and the traction speed was 5m / min.

[0050] Strengthening the waterproof layer molding process: Add 60.0 parts of 7042 linear low-density polyethylene, 20.0 parts of 6098 high-density polyethylene, 5.0 parts of 1102K high-strength polypropylene, 8.0 parts of calcium carbonate masterbatch, 1.0 part of color masterbatch, and 5.0 parts of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0051] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.3mm bottom waterproof layer, a 0.3mm middle waterproof layer, and a 0.3mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 0.9mm pre-laid reverse-adhesive polymer composite sheet.

[0052] Glue application and sanding steps:

[0053] The first step is the preparation of cement sand. 40.0 parts white cement, 15.0 parts penetrating crystallizing masterbatch, and 30.0 parts 800 mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0054] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 0.9mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.3mm. The roll thickness is 1.2mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0055] Example 2:

[0056] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and dodecyltriethoxysilane (60:30:10) evenly in a container. Then, let the mixture stand for 1 day to complete the silane end-capping pretreatment of the degradation agent.

[0057] 35.0 parts of EPDM rubber, 5.0 parts of TPR thermoplastic rubber, 8.0 parts of pretreatment degradation agent, 10.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch and 1.0 part of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0058] Intermediate waterproof layer forming steps: First, mix PE recycled material and KH-560 silane coupling agent in a container at a ratio of 95:5. Then, let the mixture stand for 1 day to complete the pretreatment of PE recycled material.

[0059] 70.0 parts of pretreated recycled PE, 30.0 parts of 6098 high-density polyethylene, 1.0 part of calcium carbonate masterbatch, 1.0 part of color masterbatch and 3.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~210℃, the die temperature of the extruded material was controlled at 190℃~200℃, and the traction speed was 5m / min.

[0060] Strengthening the waterproof layer molding process: Add 50.0 parts of 7042 linear low-density polyethylene, 30.0 parts of 6098 high-density polyethylene, 8.0 parts of 1102K high-strength polypropylene, 10.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch, and 1.0 part of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0061] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.3mm bottom waterproof layer, a 0.3mm middle waterproof layer, and a 0.4mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 1.0mm pre-laid reverse-adhesive polymer composite sheet.

[0062] Glue application and sanding steps:

[0063] The first step is the preparation of cement sand. 50.0 parts of white cement, 12.0 parts of penetrating crystallizing masterbatch, and 25.0 parts of 800-mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0064] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 1.0mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.4mm. The roll thickness is 1.4mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0065] Example 3:

[0066] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and dodecyltriethoxysilane (60:30:10) evenly in a container. Then, let the mixture stand for 1 day to complete the silane end-capping pretreatment of the degradation agent.

[0067] 40.0 parts of EPDM rubber, 10.0 parts of TPR thermoplastic rubber, 5.0 parts of pretreatment degradation agent, 8.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch and 3.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0068] Intermediate waterproof layer forming steps: First, mix PE recycled material and KH-560 silane coupling agent in a container at a ratio of 95:5. Then, let the mixture stand for 1 day to complete the pretreatment of PE recycled material.

[0069] 80.0 parts of pretreated recycled PE, 20.0 parts of 6098 high-density polyethylene, 3.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch and 5.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~210℃, the die temperature of the extruded material was controlled at 190℃~200℃, and the traction speed was 5m / min.

[0070] Strengthening the waterproof layer molding process: Add 70.0 parts of 7042 linear low-density polyethylene, 25.0 parts of 6098 high-density polyethylene, 10.0 parts of 1102K high-strength polypropylene, 5.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch, and 4.0 parts of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0071] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.4mm bottom waterproof layer, a 0.4mm middle waterproof layer, and a 0.4mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 1.2mm pre-laid reverse-adhesive polymer composite sheet.

[0072] Glue application and sanding steps:

[0073] The first step is the preparation of cement sand. 45.0 parts of white cement, 10.0 parts of penetrating crystallizing masterbatch, and 20.0 parts of 800-mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0074] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 1.2mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.4mm. The roll thickness is 1.6mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0075] The performance of the biodegradable pre-laid reverse-adhesive polymer waterproof membrane prepared in Examples 1-3 was tested, and the results are shown in Table 1:

[0076] Table 1 Performance test results of Examples 1-3

[0077]

[0078] Comparative Example 1

[0079] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA) and polycaprolactone (PCL) in a container at a ratio of 60:40. Then, let the mixture stand for 1 day to complete the pretreatment of the degradation agent.

[0080] 0.0 parts of EPDM rubber, 45.0 parts of TPR thermoplastic rubber, 10.0 parts of pretreatment degradation agent, 5.0 parts of calcium carbonate masterbatch, 1.0 part of color masterbatch and 5.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0081] Intermediate waterproof layer forming steps: First, mix PE recycled material and KH-560 silane coupling agent in a container at a ratio of 95:5. Then, let the mixture stand for 1 day to complete the pretreatment of PE recycled material.

[0082] 60.0 parts of pretreated recycled PE, 25.0 parts of 6098 high-density polyethylene, 5.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch and 1.0 part of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~210℃, the die temperature of the extruded material was controlled at 190℃~200℃, and the traction speed was 5m / min.

[0083] Strengthening the waterproof layer molding process: Add 60.0 parts of 7042 linear low-density polyethylene, 20.0 parts of 6098 high-density polyethylene, 5.0 parts of 1102K high-strength polypropylene, 8.0 parts of calcium carbonate masterbatch, 1.0 part of color masterbatch, and 5.0 parts of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0084] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.3mm bottom waterproof layer, a 0.3mm middle waterproof layer, and a 0.3mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 0.9mm pre-laid reverse-adhesive polymer composite sheet.

[0085] Glue application and sanding steps:

[0086] The first step is the preparation of cement sand. 40.0 parts white cement, 15.0 parts penetrating crystallizing masterbatch, and 30.0 parts 800 mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0087] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 0.9mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.3mm. The roll thickness is 1.2mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0088] Comparative Example 2

[0089] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and dodecyltriethoxysilane (60:30:10) evenly in a container. Then, let the mixture stand for 1 day to complete the silane end-capping pretreatment of the degradation agent.

[0090] 35.0 parts of EPDM rubber, 5.0 parts of TPR thermoplastic rubber, 8.0 parts of pretreatment degradation agent, 10.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch and 0.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0091] Intermediate waterproof layer forming steps: Add 70.0 parts of recycled PE material, 30.0 parts of 6098 high-density polyethylene, 1.0 part of calcium carbonate masterbatch, 1.0 part of color masterbatch and 3.0 parts of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0092] Strengthening the waterproof layer molding process: Add 50.0 parts of 7042 linear low-density polyethylene, 30.0 parts of 6098 high-density polyethylene, 8.0 parts of 1102K high-strength polypropylene, 10.0 parts of calcium carbonate masterbatch, 2.0 parts of color masterbatch, and 1.0 part of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0093] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.3mm bottom waterproof layer, a 0.3mm middle waterproof layer, and a 0.4mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 1.0mm pre-laid reverse-adhesive polymer composite sheet.

[0094] Glue application and sanding steps:

[0095] The first step is the preparation of cement sand. 50.0 parts of white cement, 12.0 parts of penetrating crystallizing masterbatch, and 25.0 parts of 800-mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0096] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 1.0mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.4mm. The roll thickness is 1.4mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0097] Comparative Example 3

[0098] The bottom waterproof layer forming steps are as follows: First, mix polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and dodecyltriethoxysilane (60:30:10) evenly in a container. Then, let the mixture stand for 1 day to complete the silane end-capping pretreatment of the degradation agent.

[0099] 40.0 parts of EPDM rubber, 10.0 parts of TPR thermoplastic rubber, 5.0 parts of pretreatment degradation agent, 8.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch and 3.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~200℃, the die temperature of the extruded material was controlled at 180℃~190℃, and the traction speed was 5m / min.

[0100] Intermediate waterproof layer forming steps: First, mix PE recycled material and KH-560 silane coupling agent in a container at a ratio of 95:5. Then, let the mixture stand for 1 day to complete the pretreatment of PE recycled material.

[0101] 80.0 parts of pretreated recycled PE, 20.0 parts of 6098 high-density polyethylene, 3.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch and 5.0 parts of antioxidant were added to the mixer. After mixing for 1 hour, the material entered the twin-screw extruder. The barrel temperature was controlled at 190℃~210℃, the die temperature of the extruded material was controlled at 190℃~200℃, and the traction speed was 5m / min.

[0102] Strengthening the waterproof layer molding process: Add 70.0 parts of 7042 linear low-density polyethylene, 25.0 parts of 6098 high-density polyethylene, 0.0 parts of 1102K high-strength polypropylene, 5.0 parts of calcium carbonate masterbatch, 3.0 parts of color masterbatch, and 4.0 parts of antioxidant to the mixer. After mixing for 1 hour, the material enters the twin-screw extruder. The barrel temperature is controlled at 190℃~210℃, the die temperature of the extruded material is controlled at 190℃~200℃, and the traction speed is 5m / min.

[0103] Composite sheet forming steps: Three twin-screw extruders simultaneously form a 0.4mm bottom waterproof layer, a 0.4mm middle waterproof layer, and a 0.4mm reinforced waterproof layer. Then, a three-roll calender is used to calender and bond the biodegradable bottom layer, the middle recycled material layer, and the reinforced puncture-resistant layer together. Cooling rollers, traction rollers, and winding rollers are used to produce a 1.2mm pre-laid reverse-adhesive polymer composite sheet.

[0104] Glue application and sanding steps:

[0105] The first step is the preparation of cement sand. 45.0 parts of white cement, 10.0 parts of penetrating crystallizing masterbatch, and 20.0 parts of 800-mesh quartz sand are added to a mortar mixer and mixed for 30 minutes. The mixture is then discharged to produce cement sand.

[0106] Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the 1.2mm thick composite sheet. Control the adhesive application temperature at 160℃~170℃ and the adhesive thickness at 0.4mm. The roll thickness is 1.6mm. Sprinkle 500g of self-made cement mortar per square meter. Apply adhesive only to the edge of the sheet up to 80mm, without sprinkling cement mortar.

[0107] Performance tests were conducted on a biodegradable pre-laid reverse-adhesive polymer waterproof membrane prepared in Comparative Examples 1-3. The results are shown in Table 2.

[0108] Table 2 Performance test results for comparative examples 1-3

[0109]

[0110] The difference between Comparative Example 1 and Example 1 is that EPDM rubber was not used and the degradation agent was not silane-terminated. The degradation agent reacted directly with the polymer material, leading to the breakage of the polymer chains and the generation of degradation products. These degradation products can be small molecule compounds, low molecular weight polymers, or soluble substances, significantly reducing the performance of the polymer sheet. The difference between Comparative Example 2 and Example 2 is that antioxidants were not used and the recycled PE material was not pretreated with a silane coupling agent. Due to the unstable performance of the recycled PE material, the short-term nail tear strength and puncture strength did not decrease significantly, but the retention rate of performance under 28-day, 80°C damp heat aging was poor, and the performance degradation was relatively large. Therefore, the recycled material needs to be able to react chemically with the silane coupling agent to form chemical bonds, thereby improving the performance stability of the recycled material. It also needs to be used in combination with antioxidants. The difference between Comparative Example 3 and Example 3 is that a reinforced waterproof layer was not used and high-strength polypropylene was not used, resulting in a certain degree of decrease in the puncture strength and nail tear strength of the roll material.

[0111] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a biodegradable pre-laid reverse-adhesive polymer waterproof membrane, characterized in that: Includes the following steps: S1. Processing technology of the bottom waterproof layer: 30.0~40.0 parts of EPDM rubber, 5.0~15.0 parts of TPR thermoplastic rubber, 5.0~10.0 parts of pretreatment degradation agent, 5.0~10.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture is fed into the extruder to prepare the bottom waterproof layer. S2. Intermediate waterproof layer processing technology: 60.0~80.0 parts of pretreated recycled PE, 20.0~30.0 parts of polyethylene, 1.0~5.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture is fed into the extruder to prepare the intermediate waterproof layer. S3. Enhanced waterproof layer processing technology: 50.0~70.0 parts of first polyethylene, 20.0~30.0 parts of second polyethylene, 5.0~10.0 parts of polypropylene, 5.0~10.0 parts of calcium carbonate masterbatch, 1.0~3.0 parts of color masterbatch and 1.0~5.0 parts of antioxidant are added to the mixer according to the weight percentage. After mixing, the mixture enters the extruder to prepare the enhanced waterproof layer. The density of the first polyethylene is less than the density of the second polyethylene. S4. Composite sheet forming process: The bottom waterproof layer, the middle waterproof layer and the reinforcing waterproof layer are sequentially laminated together by a calendering machine to prepare a polymer composite sheet. S5. Apply adhesive and sprinkle sand: Apply pressure-sensitive hot melt adhesive to the surface of the reinforced waterproof layer of the polymer composite sheet. The application temperature is controlled at 160℃~170℃ and the thickness is controlled at 0.3mm~0.4mm. Then, sprinkle cement sand on the surface of the adhesive layer. The preparation method of the pretreatment degradation agent includes mixing polyhydroxy fatty acid ester, polycaprolactone, and dodecyltriethoxysilane in a container at a weight percentage of 60:30:10, and allowing the mixture to stand for 1 day.

2. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: The method for preparing the pretreated PE recycled material includes mixing the PE recycled material and silane coupling agent in a container at a weight ratio of 95:5, and allowing the mixture to stand for 1 day.

3. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: The method for preparing the cement sand includes adding 40.0~50.0 parts of white cement, 10.0~15.0 parts of penetrating crystallizing masterbatch, and 20.0~30.0 parts of 800-mesh quartz sand by weight percentage to a mortar mixer, mixing for 30 minutes, and then discharging to produce cement sand.

4. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: The surface of the reinforced waterproof layer of the polymer composite sheet is completely coated with pressure-sensitive hot melt adhesive. The area covered by the cement mortar is smaller than the surface area of ​​the polymer composite sheet, and the distance between the edge of the cement mortar and the edge of the polymer composite sheet is 80mm.

5. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: The extrusion process of the extruder in steps S1, S2, and S3 includes using a twin-screw extruder, controlling the barrel temperature at 190℃~210℃, controlling the die temperature of the extruded material at 190℃~200℃, and the traction speed at 5m / min.

6. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: The thickness of the bottom waterproof layer is 0.3mm~0.4mm, the thickness of the middle waterproof layer is 0.3mm~0.4mm, and the thickness of the reinforced waterproof layer is 0.3mm~0.4mm.

7. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: In step S4, the bottom waterproof layer, the middle waterproof layer, and the reinforced waterproof layer are laminated together by a three-roll calender.

8. The preparation method of a biodegradable pre-laid reverse-adhesive polymer waterproof membrane as described in claim 1, characterized in that: In step S5, cement sand is spread at a rate of 500g per square meter.

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