Self-adhesive modified asphalt building waterproofing membrane and preparation method and construction method

Abstract

The invention belongs to the field of building waterproof materials, and discloses a self-adhesive modified asphalt building waterproof roll material, a preparation method and a construction method; the self-adhesive modified asphalt building waterproof roll material comprises a modified asphalt layer, an adhesive layer and an isolation protective film applied to the adhesive layer; wherein, the adhesive layer is pre-implanted with a polyurethane prepolymer in a butyl rubber self-adhesive layer, and during construction, a layer of dispersion liquid of amino-terminated polyether and liquid amine is pre-sprayed on a building base surface, so that while the butyl rubber is bonded, the polyurethane prepolymer quickly extends the chain with the amino-terminated polyether and liquid amine on the building base surface to form a polyurea layer, the polyurea has extremely strong hydrophobicity, is insensitive to environmental humidity, and can be normally constructed under extremely harsh environmental conditions, thereby effectively bonding the waterproof roll material to the building base surface without being affected by the water content of the base surface.

Description

Technical Field

[0001] The invention belongs to the field of building waterproof materials, and specifically relates to waterproof coiled materials for construction projects, and in particular to a self-adhesive modified asphalt building waterproof coiled material and a preparation method and a construction method. Background Art

[0002] As an important construction part of current construction projects, building waterproofing has made great breakthroughs in waterproof performance and construction convenience with the development of new material technologies. For example, rigid mortar waterproofing agents, cement-based (rigid) waterproof coatings, penetrating crystalline waterproof coatings; flexible polymer waterproof coatings, and waterproof membranes are widely used in building waterproofing projects.

[0003] As a material that can be constructed over a large area and is highly effective in water-blocking, waterproofing membranes are widely used in areas with high waterproofing requirements, such as building basements and tunnels. In particular, the flexibility of waterproofing membranes can effectively prevent cracking caused by underground deformation, which is difficult to achieve with other rigid waterproofing materials. Currently, the commonly used waterproofing membranes are mainly modified asphalt waterproofing membranes, polyethylene polypropylene waterproofing membranes, PVC waterproofing membranes, EPDM rubber waterproofing membranes, etc. According to practical use, modified asphalt waterproofing membranes have become the first choice in waterproofing construction of large underground projects, tunnels, and other buildings. The main reason is that asphalt waterproofing membranes are superior in self-healing compared to other membranes, and can adapt to waterproofing caused by underground settlement deformation, etc. After the appearance of damaged microcracks, the self-flow of asphalt can achieve self-repair.

[0004] The firm bond between the asphalt membrane and the building base directly determines the waterproof effect and durability. After the membrane is tightly bonded to the building base, even if the building base is cracked, the asphalt waterproof membrane will slightly deform and densely repair the cracks; however, if the bonding is not strong, the membrane will separate from the building base to form hollows, which is easy to leak water. The biggest obstacle to the use of waterproof membranes is the bonding problem between the base and the base. The traditional asphalt waterproof membrane construction is mainly to heat the membrane with a hot spray gun to melt the surface and then bond it to the building base. Although the hot melt method is low-cost, it is easy to damage the membrane and age the surface; and it is a one-time bonding with the building base. Once the bonding contact is not tight, it will cause hollows, which are difficult to repair, and it is easy to leak water at the hollows.

[0005] Cold bonding is the main development direction of asphalt waterproofing membranes. By setting an adhesive layer on the surface of the membrane, the membrane can be self-adhesive. At present, self-adhesive modified asphalt-based waterproofing membranes are gradually being promoted and used in the market. On the one hand, the construction of self-adhesive modified asphalt-based waterproofing membranes is simple and convenient; on the other hand, they are closely bonded to the building base and will not form hollows; even if hollows are formed, they can be remedied and eliminated through later inspections.

[0006] However, the adhesive layer of existing self-adhesive modified asphalt building waterproofing membranes is mainly formed by adhesives such as butyl rubber, terpene resin, hydrogenated rosin, and cyclohexane oil. The bonding force mainly relies on the van der Waals force or secondary bonds such as hydrogen bonds between the bonding layer and the concrete surface. It is a physical force. As time goes by, the bonding force decreases, and eventually bulging and water leakage problems occur. Furthermore, self-adhesive asphalt waterproofing membranes have strict construction requirements for waterproof base surfaces. They must be constructed on a completely flat, smooth, and water-free base surface, otherwise stratification, bulging, and water leakage will occur. However, it is difficult to meet these requirements in most construction environments. In particular, most of the base surfaces contain water, which will cause a decrease in bonding strength. Summary of the invention

[0007] Aiming at the poor bonding strength between the current self-adhesive modified asphalt building waterproof membrane and the building base, and the stringent requirements on the water content of the building base during the bonding construction; in order to improve the bonding and construction adaptability of the self-adhesive modified asphalt building waterproof membrane, the present invention proposes a self-adhesive modified asphalt building waterproof membrane; further, provides a preparation method and a construction method of the self-adhesive modified asphalt building waterproof membrane.

[0008] First, the first object of the present invention is a self-adhesive modified asphalt building waterproofing membrane, which is characterized by: comprising a modified asphalt layer, an adhesive layer and an isolation protective film applied to the adhesive layer; wherein:

[0009] The modified asphalt layer is prepared by the following method:

[0010] 3-5 parts by weight of asbestos, 1-3 parts by weight of nano-silicon dioxide, 5-10 parts by weight of recycled rubber powder, 10-15 parts by weight of SBS, 1-2 parts by weight of coumarone resin, 0.01-0.03 parts by weight of maleic anhydride, 0.1-0.3 parts by weight of antioxidant, 3-5 parts by weight of bentonite, and 80-100 parts by weight of No. 90 asphalt material are added into a mixer and mixed evenly, then sent into a twin-screw extruder for melt mixing, extruded through a "T"-shaped die, and three-roll calendered to obtain a modified asphalt layer with a thickness of 1.0-2.0 mm;

[0011] The adhesive layer is prepared by the following method:

[0012] 10-15 parts by weight of polyether polyol is added to a stirring container, heated to 110°C, then vacuum dehydrated for 1 hour, cooled to 40-50°C, added with 15-20 parts by weight of polyisocyanate, reacted at 80°C for 1-2 hours, and kept at 50°C for 1-3 hours to obtain a polyurethane prepolymer; the polyurethane prepolymer is input into a colloid grinder, and then 30-40 parts by weight of No. 130 asphalt, 10-15 parts by weight of styrene-butadiene rubber, 5-10 parts by weight of rosin resin, and 15-20 parts by weight of aromatic oil are added and ground into a colloid as a bonding layer;

[0013] The isolation protective film is one of PET film, PVC film and PP film.

[0014] Preferably, the antioxidant is selected from antioxidant 1010, antioxidant 168 or a complex of the two.

[0015] Preferably, the reclaimed rubber powder is reclaimed rubber prepared by grinding waste tires with a particle size less than 100 meshes, which is mainly used to reduce costs and increase the toughness of the coiled material.

[0016] Preferably, the nano-silicon dioxide can increase the compactness of the coiled material, and the addition of nano-silicon dioxide is conducive to the combination with concrete.

[0017] The second object of the present invention is a method for preparing a self-adhesive modified asphalt building waterproof membrane, characterized in that the specific preparation method is as follows:

[0018] (1) Add 10-15 parts by weight of polyether polyol into a stirring container, heat to 110°C, then vacuum dehydrate for 1 hour, cool to 40-50°C, add 15-20 parts by weight of polyisocyanate, react at 80°C for 1-2 hours, and keep warm at 50°C for 1-3 hours to obtain a polyurethane prepolymer; input the polyurethane prepolymer into a colloid grinder, then add 30-40 parts by weight of No. 130 asphalt, 10-15 parts by weight of styrene-butadiene rubber, 5-10 parts by weight of rosin resin, and 15-20 parts by weight of aromatic oil to grind into a colloid;

[0019] (2) Add 3-5 parts by weight of asbestos, 1-3 parts by weight of nano-silicon dioxide, 5-10 parts by weight of recycled rubber powder, 10-15 parts by weight of SBS, 1-2 parts by weight of coumarone resin, 0.01-0.03 parts by weight of maleic anhydride, 0.1-0.3 parts by weight of antioxidant, 3-5 parts by weight of bentonite, and 80-100 parts by weight of No. 90 asphalt material into a mixer and mix them evenly, then send them into a twin-screw extruder for melt mixing, extrude them through a "T"-shaped die, and calender them with three rollers to obtain a modified asphalt layer with a thickness of 1.0-2.0 mm;

[0020] (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot; then an isolation protective film is applied, the layer is leveled with a roller, rolled up, and sealed and packaged to obtain a self-adhesive modified asphalt building waterproofing membrane.

[0021] Preferably, the melting and mixing temperature of the twin-screw extruder is set at 130-140° C.; the temperature of the three rollers is controlled at 50-60° C. Too high a temperature will cause roller sticking; too low a temperature will affect the adhesion of the subsequent colloid.

[0022] Further preferably, the colloid is scraped on the modified asphalt layer with a scraping thickness of 0.3-0.5 mm.

[0023] The third object of the present invention is a construction method of a self-adhesive modified asphalt building waterproof membrane, characterized in that the specific construction method is:

[0024] (1) Clean up debris, dust and water stains on the construction surface;

[0025] (2) Disperse 20-30 parts by weight of amino-terminated polyether and 10-15 parts by weight of liquid amine evenly, and spray them on the building base surface to make it wet;

[0026] (3) Remove the isolation protective film of the self-adhesive modified asphalt building waterproof membrane, quickly stick it on the base surface, compact it and complete the paving.

[0027] Preferably, the amino-terminated polyether is D-2000 amino-terminated polyether produced by BASF. D-2000 amino-terminated polyether is an active chain extender for polyurethane, which can quickly extend the chain of polyurethane prepolymer.

[0028] Preferably, the liquid amine is selected from one of diethyltoluenediamine, dimethylthiotoluenediamine, and N,N'-dialkylmethyldiphenylamine.

[0029] Different from conventional self-adhesive asphalt waterproofing membranes, in order to increase the bonding firmness between the modified asphalt waterproofing membrane and the building base surface, and to avoid the influence of the moisture contained in the building base surface on the bonding property, the present invention pre-implants a polyurethane prepolymer in the butyl rubber self-adhesive layer. During construction, a layer of dispersion of amino-terminated polyether and liquid amine is pre-sprayed on the building base surface, so that while the butyl rubber is bonded, the polyurethane prepolymer quickly extends the chain with the amino-terminated polyether and liquid amine on the building base surface to form a polyurea layer. The polyurea is extremely hydrophobic, insensitive to environmental humidity, and can even form a film on water. It can be normally constructed under extremely harsh environmental conditions, thereby effectively bonding the membrane to the building base surface without being affected by the water content of the base surface. The self-adhesive modified asphalt building waterproofing membrane obtained by the present invention has wide adaptability, is particularly suitable for construction in humid environments, and is suitable for waterproofing of underground waterproofing projects such as basements, artificial lakes, culverts, tunnels, subways, and waterproofing construction in complex environments.

[0030] A self-adhesive modified asphalt building waterproof membrane, compared with self-adhesive waterproof membrane, the outstanding technical advantages are reflected in:

[0031] (1) The present invention pre-plants a polyurethane prepolymer in the self-adhesive layer, and sprays a layer of amino-terminated polyether and liquid amine dispersion on the building base surface during construction, which can quickly make the polyurethane prepolymer form polyurea and adhere to the base surface. It has strong adaptability to humid environments and its adhesion will not be affected by environmental humidity.

[0032] (2) The self-adhesive modified asphalt building waterproofing membrane of the present invention has wide adaptability and is particularly suitable for construction in humid environments. It is suitable for waterproofing of underground waterproofing projects such as basements, artificial lakes, culverts, tunnels, subways, and waterproofing construction in complex environments. After paving, it will not bulge or leak water due to humid environments, effectively preventing water from penetrating. Even if water penetrates, it will not leak.

[0033] (3) The self-adhesive modified asphalt building waterproofing membrane of the present invention further expands the use environment of the waterproofing membrane, so that the construction no longer places stringent requirements on the building base surface, thereby greatly improving the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] Figure 1 The schematic diagram of the self-adhesive modified asphalt building waterproofing membrane of the present invention is shown in FIG. 1: modified asphalt layer; 2: adhesive layer; 3: isolation protective film. DETAILED DESCRIPTION

[0036] The following examples are intended to further describe the present invention, but are not intended to limit the scope of protection of the claims of the present invention.

[0037] Example 1

[0038] A method for preparing a self-adhesive modified asphalt building waterproofing membrane:

[0039] (1) 15 parts by weight of a polyethylene glycol ether having a molecular weight of 3000 is added to a stirring container, heated to 110°C, then vacuum dehydrated for 1 hour, cooled to 40°C, added with 20 parts by weight of 4,4'-diphenylmethane diisocyanate, reacted at 80°C for 2 hours, and kept at 50°C for 1 hour to obtain a polyurethane prepolymer; the polyurethane prepolymer is input into a colloid grinder, and then 30 parts by weight of No. 130 asphalt, 10 parts by weight of styrene-butadiene rubber, 10 parts by weight of rosin resin, and 20 parts by weight of aromatic oil are added to grind into a colloid;

[0040] (2) Add 5 parts by weight of asbestos, 1 part by weight of nano-silicon dioxide, 5 parts by weight of recycled rubber powder, 15 parts by weight of SBS, 2 parts by weight of coumarone resin, 0.01 parts by weight of maleic anhydride, 0.1 parts by weight of 1010 antioxidant, 3 parts by weight of bentonite, and 100 parts by weight of No. 90 asphalt material into a mixer and mix them evenly. Then, send them into a twin-screw extruder and melt-mix them at 130-140°C. Then, extrude them through a "T"-shaped die and calender them with three rollers. The temperature of the three rollers is controlled at 50-60°C to obtain a modified asphalt layer with a thickness of 2.0 mm.

[0041] (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot, with a coating thickness of 0.5 mm; then a PET film is applied, the film is leveled with a roller, rolled up, and sealed to obtain a self-adhesive modified asphalt building waterproof membrane.

[0042] Construction method:

[0043] (1) Clean up debris, dust and water stains on the construction surface;

[0044] (2) Disperse 30 parts by weight of D-2000 amino-terminated polyether and 15 parts by weight of diethyltoluenediamine evenly, and spray them on the building base surface to make it wet;

[0045] (3) Remove the isolation protective film of the self-adhesive modified asphalt building waterproof membrane, quickly stick it on the base surface, compact it and complete the paving.

[0046] Example 2

[0047] A method for preparing a self-adhesive modified asphalt building waterproofing membrane:

[0048] (1) 10 parts by weight of polypropylene glycol ether with a molecular weight of 2000 is added to a stirring container, heated to 110° C., then vacuum dehydrated for 1 hour, cooled to 50° C., added with 15 parts by weight of 4,4'-diphenylmethane diisocyanate, reacted at 80° C. for 1 hour, and kept at 50° C. for 1 hour to obtain a polyurethane prepolymer; the polyurethane prepolymer is input into a colloid grinder, and then 40 parts by weight of No. 130 asphalt, 15 parts by weight of styrene-butadiene rubber, 5 parts by weight of rosin resin, and 15 parts by weight of aromatic oil are added to grind into a colloid;

[0049] (2) Add 3 parts by weight of asbestos, 1 part by weight of nano-silicon dioxide, 10 parts by weight of recycled rubber powder, 15 parts by weight of SBS, 2 parts by weight of coumarone resin, 0.01 parts by weight of maleic anhydride, 0.2 parts by weight of 1010 antioxidant, 5 parts by weight of bentonite, and 90 parts by weight of No. 90 asphalt material into a mixer and mix them evenly. Then, send them into a twin-screw extruder and melt-knead them at 130-140°C. Then, extrude them through a "T"-shaped die and calender them with three rollers. The temperature of the three rollers is controlled at 50-60°C to obtain a modified asphalt layer with a thickness of 2.0 mm.

[0050] (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot, with a coating thickness of 0.4 mm; then an isolation protective film PET film is applied, the surface is leveled with a roller, rolled up, and sealed and packaged to obtain a self-adhesive modified asphalt building waterproof membrane.

[0051] Construction method:

[0052] (1) Clean up debris, dust and water stains on the construction surface;

[0053] (2) Disperse 20 parts by weight of D-2000 amino-terminated polyether and 15 parts by weight of N,N'-dialkylmethyldiphenylamine evenly, and spray them on the building base surface to wet it;

[0054] (3) Remove the isolation protective film of the self-adhesive modified asphalt building waterproof membrane, quickly stick it on the base surface, compact it and complete the paving.

[0055] Example 3

[0056] A method for preparing a self-adhesive modified asphalt building waterproofing membrane:

[0057] (1) 12 parts by weight of a polyethylene glycol ether having a molecular weight of 2000 is added to a stirring container, heated to 110°C, then vacuum-dehydrated for 1 hour, cooled to 40°C, added with 20 parts by weight of 4,4'-diphenylmethane diisocyanate, reacted at 80°C for 2 hours, and kept at 50°C for 3 hours to obtain a polyurethane prepolymer; the polyurethane prepolymer is input into a colloid grinder, and then 40 parts by weight of No. 130 asphalt, 10 parts by weight of styrene-butadiene rubber, 8 parts by weight of rosin resin, and 18 parts by weight of aromatic oil are added to grind into a colloid;

[0058] (2) Add 5 parts by weight of asbestos, 2 parts by weight of nano-silicon dioxide, 7 parts by weight of recycled rubber powder, 15 parts by weight of SBS, 2 parts by weight of coumarone resin, 0.01 parts by weight of maleic anhydride, 0.3 parts by weight of 1010 antioxidant, 3 parts by weight of bentonite, and 100 parts by weight of No. 90 asphalt material into a mixer and mix them evenly. Then, send them into a twin-screw extruder and melt-mix them at 130-140°C. Then, extrude them through a "T"-shaped die and calender them with three rollers. The temperature of the three rollers is controlled at 50-60°C to obtain a modified asphalt layer with a thickness of 2.0 mm.

[0059] (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot, with a coating thickness of 0.3 mm; then an isolation protective film PET film is applied, the surface is leveled with a roller, rolled up, and sealed and packaged to obtain a self-adhesive modified asphalt building waterproof membrane.

[0060] Construction method:

[0061] (1) Clean up debris, dust and water stains on the construction surface;

[0062] (2) Disperse 25 parts by weight of D-2000 amino-terminated polyether and 15 parts by weight of diethyltoluenediamine evenly, and spray them on the building base surface to make it wet;

[0063] (3) Remove the isolation protective film of the self-adhesive modified asphalt building waterproof membrane, quickly stick it on the base surface, compact it and complete the paving.

[0064] Comparative Example 1

[0065] A method for preparing a self-adhesive modified asphalt building waterproofing membrane:

[0066] (1) Grind 30 parts by weight of No. 130 asphalt, 10 parts by weight of styrene-butadiene rubber, 10 parts by weight of rosin resin, and 20 parts by weight of aromatic oil into a colloid;

[0067] (2) Add 5 parts by weight of asbestos, 1 part by weight of nano-silicon dioxide, 5 parts by weight of recycled rubber powder, 15 parts by weight of SBS, 2 parts by weight of coumarone resin, 0.01 parts by weight of maleic anhydride, 0.1 parts by weight of 1010 antioxidant, 3 parts by weight of bentonite, and 100 parts by weight of No. 90 asphalt material into a mixer and mix them evenly. Then, send them into a twin-screw extruder and melt-mix them at 130-140°C. Then, extrude them through a "T"-shaped die and calender them with three rollers. The temperature of the three rollers is controlled at 50-60°C to obtain a modified asphalt layer with a thickness of 2.0 mm.

[0068] (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot, with a coating thickness of 0.5 mm; then a PET film is applied, the film is leveled with a roller, rolled up, and sealed to obtain a self-adhesive modified asphalt building waterproof membrane.

[0069] Adhesion peel strength test:

[0070] The adhesiveness of the waterproof membranes obtained in Examples 1-3 and Comparative Examples 1-2 was tested with reference to the requirements of GB / T23260-2009 (waterproof membranes with self-adhesive layers).

[0071] The waterproof membranes of Examples 1-3 and Comparative Example 1 were cut into test specimens of 50×75 mm, and samples were prepared according to GB / T 328.20-2007. The membranes were pasted on a smooth aluminum plate cleaned with a solvent, and then rolled three times with a 2 kg roller with a width of 50 mm. The membranes were left to stand for 24 hours, and the peel strength was measured. The test results are shown in Table 1.

[0072] The waterproof membranes of Examples 1-3 and Comparative Example 1 were cut into test specimens of 50×75 mm, and samples were prepared according to GB / T 328.20-2007. The membranes were pasted on a smooth aluminum plate cleaned with a solvent, and then rolled 3 times with a 2 kg roller with a width of 50 mm. The membranes were allowed to stand for 24 hours, immersed in 23°C water for 7 days, then taken out, left for 24 hours, and the peel strength was measured. The test results are shown in Table 1.

[0073] The waterproof membranes of Examples 1-3 and Comparative Example 1 were cut into test samples of 50×75 mm, water stains were wiped off on a smooth aluminum plate, the membranes were pasted, and then rolled three times with a 2 kg roller with a width of 50 mm. After standing for 24 hours, the peel strength was measured. The test results are shown in Table 1.

[0074] The waterproof membranes of Examples 1-3 and Comparative Example 1 were cut into test specimens of 50×75 mm. After wiping water off a smooth aluminum plate, a dispersion of terminal amino polyether and diethyltoluenediamine was sprayed on the specimens. The membranes were pasted and then rolled three times with a 2 kg roller with a width of 50 mm. The specimens were allowed to stand for 24 hours and the peel strength was measured. The test results are shown in Table 1.

[0075] Table 1:

[0076]

[0077] Through the above tests, the self-adhesive modified asphalt building waterproofing membrane obtained by the present invention has significantly improved bonding performance on the aluminum plate wiped with water and sprayed with dispersion. Under normal circumstances, the bonding performance of the present invention is similar to that of the comparative example 1 without the pre-polymerized polyurethane bonding layer; but in a wet environment, the sprayed dispersion not only quickly forms polyurethane prepolymer into polyurea and bonds to the base surface, which is not affected by the wet environment, but also significantly improves the bonding strength. Comparative example 1 does not have pre-planted polyurethane prepolymer, and the adhesion is significantly reduced in a wet environment. It is difficult to meet the standard requirements (greater than 1.5N / mm).

[0078] It should be understood that the exemplary embodiments described herein should be considered illustrative rather than restrictive. Moreover, the description of each feature or aspect in each embodiment should be applicable to other similar features or aspects in other embodiments.

Claims

1. A self-adhesive modified asphalt building waterproofing membrane, characterized by: It includes a modified asphalt layer, an adhesive layer and an isolation protective film applied to the adhesive layer; wherein: The modified asphalt layer is prepared by the following method: 3-5 parts by weight of asbestos, 1-3 parts by weight of nano-silicon dioxide, 5-10 parts by weight of recycled rubber powder, 10-15 parts by weight of SBS, 1-2 parts by weight of coumarone resin, 0.01-0.03 parts by weight of maleic anhydride, 0.1-0.3 parts by weight of antioxidant, 3-5 parts by weight of bentonite, and 80-100 parts by weight of No. 90 asphalt material are added into a mixer and mixed evenly, then sent into a twin-screw extruder for melt mixing, extruded through a "T"-shaped die, and rolled by three rollers to obtain a modified asphalt layer with a thickness of 1.0-2.0 mm; The adhesive layer is prepared by the following method: 10-15 parts by weight of polyether polyol is added to a stirring container, heated to 110°C, then vacuum dehydrated for 1 hour, cooled to 40-50°C, added with 15-20 parts by weight of polyisocyanate, reacted at 80°C for 1-2 hours, and kept at 50°C for 1-3 hours to obtain a polyurethane prepolymer; the polyurethane prepolymer is input into a colloid grinder, and then 30-40 parts by weight of No. 130 asphalt, 10-15 parts by weight of styrene-butadiene rubber, 5-10 parts by weight of rosin resin, and 15-20 parts by weight of aromatic oil are added and ground into a colloid as a bonding layer; The isolation protective film is one of PET film, PVC film and PP film.

2. A self-adhesive modified asphalt building waterproofing membrane according to claim 1, characterized in that: The antioxidant is selected from one of antioxidant 1010 and antioxidant 168 or a composite of the two.

3. The self-adhesive modified asphalt building waterproofing membrane according to claim 1, characterized in that: The regenerated rubber powder is regenerated rubber prepared by grinding waste tires with a particle size less than 100 meshes.

4. A method for preparing the self-adhesive modified asphalt building waterproofing membrane according to any one of claims 1 to 3, characterized in that: The specific preparation method is as follows: (1) Add 10-15 parts by weight of polyether polyol into a stirring container, heat to 110°C, then vacuum dehydrate for 1 hour, cool to 40-50°C, add 15-20 parts by weight of polyisocyanate, react at 80°C for 1-2 hours, and keep warm at 50°C for 1-3 hours to obtain a polyurethane prepolymer; input the polyurethane prepolymer into a colloid grinder, then add 30-40 parts by weight of No. 130 asphalt, 10-15 parts by weight of styrene-butadiene rubber, 5-10 parts by weight of rosin resin, and 15-20 parts by weight of aromatic oil to grind into a colloid; (2) Add 3-5 parts by weight of asbestos, 1-3 parts by weight of nano-silicon dioxide, 5-10 parts by weight of recycled rubber powder, 10-15 parts by weight of SBS, 1-2 parts by weight of coumarone resin, 0.01-0.03 parts by weight of maleic anhydride, 0.1-0.3 parts by weight of antioxidant, 3-5 parts by weight of bentonite, and 80-100 parts by weight of No. 90 asphalt material into a mixer and mix them evenly, then send them into a twin-screw extruder for melt mixing, extrude them through a "T"-shaped die, and calender them with three rollers to obtain a modified asphalt layer with a thickness of 1.0-2.0 mm; (3) The modified asphalt layer rolled in step (2) is coated with the colloid obtained in step (1) while it is still hot; then an isolation protective film is applied, the layer is leveled with a roller, rolled up, and sealed and packaged to obtain a self-adhesive modified asphalt building waterproofing membrane.

5. The method for preparing the self-adhesive modified asphalt building waterproofing membrane according to claim 4, characterized in that: The melting and mixing temperature of the twin-screw extruder is set at 130-140°C; the temperature of the three rollers is controlled at 50-60°C.

6. The method for preparing the self-adhesive modified asphalt building waterproofing membrane according to claim 4, characterized in that: The colloid is scraped on the modified asphalt layer with a scraping thickness of 0.3-0.5 mm.

7. A construction method of the self-adhesive modified asphalt building waterproofing membrane as claimed in claim 1, characterized in that: The specific construction method is: (1) Clean up debris, dust and water stains on the construction surface; (2) Disperse 20-30 parts by weight of amino-terminated polyether and 10-15 parts by weight of liquid amine evenly, and spray them on the building base surface to make it wet; (3) Remove the isolation protective film of the self-adhesive modified asphalt building waterproof membrane, quickly stick it on the base surface, compact it and complete the paving.

8. The construction method of the self-adhesive modified asphalt building waterproofing membrane according to claim 7 is characterized by: The amino-terminated polyether is D-2000 amino-terminated polyether.

9. The construction method of the self-adhesive modified asphalt building waterproofing membrane according to claim 7 is characterized by: The liquid amine is selected from one of diethyltoluenediamine, dimethylthiotoluenediamine and N,N'-dialkylmethyldiphenylamine.

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