Moistureproof breathable self-adhesive asphalt waterproof coiled material and preparation method thereof

Abstract

The invention discloses a moisture-proof breathable self-adhesive asphalt waterproof coiled material and a preparation method thereof, and relates to the technical field of waterproof materials. The self-adhesive asphalt waterproof coiled material comprises a surface protection layer, a moisture-proof barrier layer, a porous breathable layer, a modified asphalt layer, a self-adhesive layer and an isolating membrane which are arranged in sequence, wherein the moisture-proof barrier layer is a composite layer prepared from a macromolecular moisture-proof agent and a hydrophobic modifier; the porous breathable layer is made of an expanded polytetrafluoroethylene film or a porous polypropylene film. The preparation method comprises the following steps: hot-pressing and compounding the modified asphalt base material and the porous breathable layer to form a composite structure of the porous breathable layer and the modified asphalt layer; the porous breathable layer is coated with a damp-proof barrier layer, and the modified asphalt layer is coated with a self-adhesive layer; and preparing a surface protection layer on the moisture-proof barrier layer, and covering the self-adhesive layer with an isolation film. According to the self-adhesive asphalt waterproof coiled material provided by the invention, through the synergistic effect of the damp-proof barrier layer and the porous breathable layer, liquid water is effectively blocked, water vapor is allowed to be discharged, and the coiled material is prevented from bulging and delaminating.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof materials, and in particular to a moisture-proof and breathable self-adhesive asphalt waterproof coiled material and a preparation method thereof. Background Art

[0002] Self-adhesive asphalt waterproofing membranes are widely used in the field of building waterproofing due to their convenient construction, environmental protection and smoke-free features. However, existing self-adhesive asphalt waterproofing membranes have the following technical difficulties in application: (1) Insufficient moisture-proof performance: In a humid or high humidity environment, the membrane is prone to bulging, delamination and other problems due to the accumulation of water vapor, affecting the waterproofing effect. (2) Poor air permeability: The membrane has a strong barrier performance to water vapor, but at the same time it prevents the internal moisture of the structure from being discharged, increasing the risk of the structure being damp. (3) Reduced adhesion: When constructed on a damp base surface, the self-adhesive layer of the membrane is difficult to maintain good adhesion, affecting the construction quality. (4) Poor durability: When exposed to a high humidity environment for a long time, the membrane is prone to aging and performance degradation, shortening its service life. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a moisture-proof and breathable self-adhesive asphalt waterproof membrane, comprising a surface protection layer, a moisture-proof barrier layer, a porous breathable layer, a modified asphalt layer, a self-adhesive layer, and a separator arranged in sequence;

[0005] Wherein, the moisture-proof barrier layer is a composite layer made of a polymer moisture-proof agent and a hydrophobic modifier;

[0006] The porous air-permeable layer is made of expanded polytetrafluoroethylene film or porous polypropylene film.

[0007] Furthermore, the raw material composition and mass ratio of the moisture-proof barrier layer are: 60%-80% of polymer moisture-proof agent and 20%-40% of hydrophobic modifier; the thickness of the moisture-proof barrier layer is 50 μm-100 μm.

[0008] Furthermore, the polymer moisture-proofing agent is polyvinylidene fluoride, and the hydrophobic modifier is a siloxane hydrophobic modifier.

[0009] Furthermore, the micropore size of the porous breathable layer is 0.1 μm-1 μm, and the thickness of the porous breathable layer is 100 μm-300 μm.

[0010] Furthermore, the porous breathable layer is a porous polypropylene film.

[0011] Furthermore, the raw material composition and mass ratio of the modified asphalt layer are: 88%-92% medium-hard petroleum asphalt, 8%-12% styrene-butadiene-styrene block copolymer; the thickness of the modified asphalt layer is 1.5mm-2.5mm.

[0012] Furthermore, the material of the surface protection layer is selected from one of mineral particles, polyethylene film or aluminum foil;

[0013] Furthermore, the raw material composition and mass ratio of the self-adhesive layer are: 55%-65% natural rubber, 25%-35% soft petroleum asphalt, and 10%-15% organic silicon reinforcing agent containing silane groups; the thickness of the self-adhesive layer is 0.5mm-1.0mm.

[0014] The moisture-proof and breathable self-adhesive asphalt waterproof membrane is suitable for outdoor wet base waterproof buildings, and its performance includes:

[0015] The air permeability reaches 1500g / (m 2 24h)-2000g / (m 2 24 hours);

[0016] After soaking the cement mortar block in water for 24 hours, the moisture-proof and breathable self-adhesive asphalt waterproof membrane was pasted on it, compacted, and placed in an environment with a temperature of (25±2)°C and a relative humidity of (40±10)% for 7 days without bulging or delamination;

[0017] The bonding strength of the dry base reaches 2.0MPa-2.5MPa, and the bonding strength of the wet base reaches 1.8MPa-2.3MPa;

[0018] There is no obvious change after the durability test at a temperature of 70°C and a relative humidity of 95% for 500 hours.

[0019] A second aspect of the present invention provides a method for preparing a moisture-proof and breathable self-adhesive asphalt waterproof membrane. The method for preparing the moisture-proof and breathable self-adhesive asphalt waterproof membrane comprises:

[0020] Melting and mixing medium-hard petroleum asphalt and styrene-butadiene-styrene block copolymer to obtain a modified asphalt base material;

[0021] Hot-pressing the modified asphalt substrate and the porous air-permeable layer to form a composite structure of the porous air-permeable layer and the modified asphalt layer;

[0022] coating the moisture-proof barrier layer on the porous air-permeable layer, and coating the self-adhesive layer on the modified asphalt layer;

[0023] The surface protection layer is prepared on the moisture-proof barrier layer, and the isolation film is covered on the self-adhesive layer.

[0024] Furthermore, the melt mixing is carried out at a temperature of 180°C-200°C.

[0025] Furthermore, the hot pressing composite is performed at a temperature of 150° C.-180° C., a pressure of 0.3 MPa-0.5 MPa, and a time of 30 s-60 s.

[0026] The moisture-proof and breathable self-adhesive asphalt waterproof membrane provided by the present invention has at least the following beneficial effects compared to the prior art through the synergistic effect of the moisture-proof barrier layer and the porous breathable layer:

[0027] 1) Highly effective moisture-proofing: blocking liquid water penetration and reducing the direct impact of moisture on the modified asphalt layer;

[0028] 2) Breathable and moisture-wicking: Allows water vapor to escape, ensuring moisture does not remain for a long time, thus preventing the roll from bulging and delamination;

[0029] 3) Delaying aging: reducing the performance aging of the modified asphalt layer caused by long-term moisture, and significantly extending the service life of the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a moisture-proof and breathable self-adhesive asphalt waterproof membrane provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below through specific embodiments.

[0032] A first aspect of an embodiment of the present invention provides a moisture-proof and breathable self-adhesive asphalt waterproof membrane, comprising a surface protection layer 1, a moisture-proof barrier layer 2, a porous breathable layer 3, a modified asphalt layer 4, a self-adhesive layer 5, and a separator 6, which are arranged in sequence;

[0033] Wherein, the moisture-proof barrier layer 2 is a composite layer made of a polymer moisture-proof agent and a hydrophobic modifier;

[0034] The porous air-permeable layer 3 is made of expanded polytetrafluoroethylene film or porous polypropylene film.

[0035] The moisture-proof and breathable self-adhesive asphalt waterproof membrane provided in an embodiment of the present invention effectively blocks liquid water and allows water vapor to be discharged through the synergistic effect of the moisture-proof barrier layer 2 and the porous breathable layer 3. The moisture-proof barrier layer 2 reduces the direct impact of moisture on the modified asphalt layer 4, while the porous breathable layer 3 ensures that moisture will not be retained for a long time, thereby reducing the aging rate of the modified asphalt layer 4, avoiding bulging and delamination of the membrane, and extending the service life of the membrane.

[0036] In some embodiments, the raw material composition and mass ratio of the moisture-proof barrier layer 2 are: 60%-80% of polymer moisture-proof agent and 20%-40% of hydrophobic modifier.

[0037] Specifically, the moisture-proof barrier layer 2 is combined with a polymer moisture-proof agent and a hydrophobic modifier to form a composite synergistic effect, thereby further improving the moisture-proof performance. The moisture-proof barrier layer 2 is designed to block the penetration of water molecules (including liquid water and water vapor), and is composed of a composite layer made of a polymer moisture-proof agent and a hydrophobic modifier. Among them, the dense molecular structure of polyvinylidene fluoride (PVDF), as the main material of the moisture-proof barrier layer, provides a physical barrier to prevent the penetration of water molecules, and it has excellent chemical stability and good tensile strength, and can maintain stable performance over a wide temperature range. Siloxane hydrophobic modifiers, the hydrophobic groups in the siloxane molecules make the surface of the material have extremely low surface energy, and water molecules are difficult to adhere. The surface of the material is made hydrophobic through chemical modification, which further improves the moisture-proof performance, and the siloxane hydrophobic modifier can be evenly mixed with the PVDF polymer material, and the performance is stable.

[0038] We have experimented with various material compositions for the moisture-proof barrier layer 2, such as a combination of polyvinyl alcohol (PVA) and a silicone hydrophobic modifier. However, the moisture-proofing effect was limited, and some bulging occurred during experiments. Combinations of polyacrylate (PAA) and a silicone hydrophobic modifier resulted in reduced coating adhesion and even detachment. Therefore, polyvinylidene fluoride (PVDF) is the preferred polymer moisture-proofing agent, and a silicone hydrophobic modifier is the preferred hydrophobic modifier. PVDF provides excellent weather resistance and a water-resistant barrier, while silicone enhances hydrophobicity and flexibility. A high PVDF content (>80%) may increase coating brittleness and reduce durability; a low content (<60%) may compromise overall moisture-proofing effectiveness and reduce water pressure resistance. Furthermore, a high content (>40%) of silicone hydrophobic modifier may impair adhesion, while a low content (<20%) may weaken hydrophobicity. The ratio of the polymer moisture-proof agent and the hydrophobic modifier of the present application can ensure the moisture-proof effect while avoiding excessive hydrophobic agent affecting the adhesion of the coating, thereby enhancing the moisture-proof performance.

[0039] Optionally, the moisture barrier layer 2 has a thickness of 50 μm to 100 μm, preferably 70 μm to 80 μm.

[0040] Specifically, if the moisture-proof barrier layer 2 is too thin (<50μm), it may reduce the moisture-proof performance and the water pressure resistance, causing the liquid water in the base layer to pass through the breathable layer and contact the asphalt layer. Long-term immersion in water will cause the waterproof life of the asphalt layer to decrease; if the moisture-proof barrier layer 2 is too thick (>100μm), it may reduce the air permeability, affect the discharge of water vapor, and increase the risk of bulging.

[0041] Therefore, it is preferred that the moisture-proof barrier layer 2 uses polyvinylidene fluoride as a polymer moisture-proof agent, and adds a silicone hydrophobic modifier to enhance the moisture-proof performance. The mass ratio is: polyvinylidene fluoride 60%-80%, silicone hydrophobic modifier 20%-40%, and the thickness is 50μm-100μm; more preferably, the raw material composition and mass ratio of the moisture-proof barrier layer 2 are: polyvinylidene fluoride 65%-75%, silicone hydrophobic modifier 25%-35%, and the thickness is 70μm-80μm.

[0042] In some embodiments, the porous air-permeable layer 3 has a thickness of 100 μm-300 μm, preferably 150 μm-250 μm.

[0043] In some embodiments, the porous air-permeable layer 3 has a pore size of 0.1 μm-1 μm.

[0044] Specifically, the porous breathable layer 3 has a pore size of 0.1 μm to 1 μm, and utilizes a microporous structure to form a selective permeable channel, allowing water vapor to pass through but blocking liquid water, thereby achieving the dual functions of moisture-proof and breathable. Optionally, the porous breathable layer 3 is made of expanded polytetrafluoroethylene (ePTFE) membrane or porous polypropylene membrane. The thickness of the porous breathable layer 3 is controlled to be 100 μm to 300 μm, preferably 150 μm to 250 μm, which significantly improves the water vapor transmission rate and adapts to the use requirements in humid environments.

[0045] In some embodiments, the thickness of the modified asphalt layer 4 is 1.5 mm-2.5 mm. The modified asphalt layer 4 is made of SBS modified asphalt, and its raw material composition and mass ratio are: medium hard petroleum asphalt 88%-92%, styrene-butadiene-styrene block copolymer (SBS) 8%-12%.

[0046] Specifically, the SBS modified asphalt is composed of medium-hard petroleum asphalt and SBS thermoplastic elastomer. The addition of SBS thermoplastic elastomer improves the high and low temperature resistance, elasticity, and toughness of the SBS modified asphalt. Optionally, the medium-hard petroleum asphalt is No. 90 petroleum asphalt.

[0047] In some embodiments, the material of the surface protection layer 1 is selected from one of mineral particles, polyethylene film or aluminum foil.

[0048] Specifically, the surface protection layer 1 is made of mineral particles, which are spread on the surface of the moisture-proof barrier layer 2 to increase wear resistance and protection performance while preventing adhesion and curling. It can also be protected by a coating (polyethylene film or aluminum foil).

[0049] In some embodiments, the raw material composition and mass ratio of the self-adhesive layer 5 are: 55%-65% natural rubber, 25%-35% soft petroleum asphalt, and 10%-15% organic silicon reinforcing agent containing silane groups; the thickness of the self-adhesive layer 5 is 0.5mm-1.0mm.

[0050] Specifically, the self-adhesive layer 5 achieves excellent initial tack and long-lasting adhesion through the synergistic effect of the composite materials. Natural rubber has high elasticity and wear resistance, but is susceptible to aging at high temperatures. Soft petroleum asphalt has good viscosity and ductility, promoting the dissolution of the modifier while providing good ductility for the coiled material. Optionally, the soft petroleum asphalt is 200# asphalt. The silane-containing organosilicon reinforcing agent chemically reacts with the natural rubber and soft petroleum asphalt to form a cross-linked structure, thereby enhancing the material's mechanical properties.

[0051] A second aspect of the embodiments of the present invention provides a method for preparing the above-mentioned moisture-proof and breathable self-adhesive asphalt waterproof membrane, comprising:

[0052] Melting and mixing medium-hard petroleum asphalt and styrene-butadiene-styrene block copolymer to obtain a modified asphalt base material;

[0053] Hot-pressing the modified asphalt substrate and the porous air-permeable layer 3 to form a composite structure of the porous air-permeable layer 3 and the modified asphalt layer 4;

[0054] Coating the moisture-proof barrier layer 2 on the porous air-permeable layer 3, and coating the self-adhesive layer 5 on the modified asphalt layer 4;

[0055] The surface protection layer 1 is prepared on the moisture-proof barrier layer 2 , and the isolation film 6 is covered on the self-adhesive layer 5 .

[0056] In some embodiments, the melt mixing is performed at a temperature of 180° C. to 200° C.;

[0057] In some embodiments, the hot pressing composite is performed at a temperature of 150° C. to 180° C., a pressure of 0.3 MPa to 0.5 MPa, and a time of 30 s to 60 s.

[0058] Specifically, a uniform modified asphalt base material is formed by melt-mixing medium-hard petroleum asphalt and SBS thermoplastic elastomer at 180-200° C. The porous air-permeable layer 3 is firmly bonded to the moisture-proof barrier layer 2 using hot-pressing technology at a pressure of 0.3-0.5 MPa.

[0059] In summary, the present invention adds a porous, breathable layer 3 to the self-adhesive asphalt waterproofing membrane, leveraging its microporous structure to achieve dual moisture-proofing and breathability. The moisture-proof barrier layer 2, through the directional arrangement of hydrophobic modifier molecules, reduces water permeability on the membrane surface, effectively preventing moisture intrusion. The self-adhesive layer 5 maintains a strong bond to the substrate even in wet conditions. The modified asphalt layer 4 slows asphalt aging, thereby maintaining the membrane's long-term stability. The resulting moisture-proof, breathable self-adhesive asphalt waterproofing membrane is suitable for outdoor waterproofing structures with damp substrates, and its performance is as follows:

[0060] (1) Breathability: up to 1500g / (m 2 24h)-2000g / (m 2 24 hours);

[0061] (2) Moisture-proof performance: After soaking the cement mortar block in water for 24 hours, the moisture-proof and breathable self-adhesive asphalt waterproof membrane was attached, compacted, and placed in an environment with a temperature of (25±2)°C and a relative humidity of (40±10)% for 7 days. No bulging or delamination occurred.

[0062] (3) Adhesion performance: The bonding strength of the dry base reaches 2.0MPa-2.5MPa, and the bonding strength of the wet base reaches 1.8MPa-2.3MPa;

[0063] (4) Resistance to moisture and heat aging: No significant change after 500h durability test at 70℃ and 95% relative humidity.

[0064] Example 1

[0065] (1) Moisture-proof and breathable self-adhesive asphalt waterproof membrane

[0066] See also Figure 1 , comprising: a surface protection layer 1, a moisture-proof barrier layer 2, a porous air-permeable layer 3, a modified asphalt layer 4, a self-adhesive layer 5 and an isolation film 6 which are arranged in sequence;

[0067] The surface protection layer 1 is made of mineral particles, specifically 80% by weight of quartz sand and 20% of colored ceramic particles;

[0068] The thickness of the moisture-proof barrier layer 2 is 70 μm, and the raw material composition and ratio are as follows: PVDF is used as a polymer moisture-proof agent, and a silicone hydrophobic modifier is added to enhance the moisture-proof performance, and the weight ratio is: PVDF 70%, silicone hydrophobic modifier 30%;

[0069] The thickness of the porous air-permeable layer 3 is 200 μm, and the porous air-permeable layer 3 is made of a porous polypropylene film;

[0070] The thickness of the modified asphalt layer 4 is 2 mm, and the raw material composition and weight ratio are: 90% No. 90 petroleum asphalt, 10% SBS thermoplastic elastomer;

[0071] The thickness of the self-adhesive layer 5 is 0.8 mm, and the raw material composition and weight ratio are: natural rubber 60%, 200# asphalt 30%, and organic silicon reinforcing agent containing silane group 10%.

[0072] (2) Preparation method

[0073] A method for preparing a moisture-proof and breathable self-adhesive asphalt waterproof membrane comprises the following steps:

[0074] 1) No. 90 petroleum asphalt and SBS thermoplastic elastomer were melt-mixed at 180° C. for 30 minutes to obtain a uniform modified asphalt base material.

[0075] 2) Using hot pressing lamination technology, the cut porous polypropylene membrane and the modified asphalt substrate are compounded at a temperature of 160° C. and a pressure of 0.4 MPa for 40 seconds to form a porous air-permeable layer 3 and a modified asphalt layer 4.

[0076] 3) The moisture-proof barrier layer 2 is coated on the porous air-permeable layer 3 using a coater, and then dried with hot air at 80° C. for 10 minutes.

[0077] 4) Coating a self-adhesive layer 5 on the modified asphalt layer 4.

[0078] 5) Sprinkling mineral particles on the upper surface moisture-proof barrier layer 2 to form a surface protection layer 1.

[0079] 6) The self-adhesive layer 5 is covered with an isolation film 6 .

[0080] (3) Performance testing

[0081] The moisture-proof and breathable self-adhesive asphalt waterproof membrane was cut into 500mm×500mm samples for testing, see Table 1 for details.

[0082] Test basis:

[0083] 1) Breathability: According to GB / T 17146-2015.

[0084] 2) Moisture resistance: Soak a 50mm*50mm damp mortar block for 24 hours, then adhere a 50mm*50mm roll to it and compact it with a roller. Incubate at 25±2°C and 40±10% relative humidity for 7 days, observing the roll for bulging and delamination.

[0085] 3) Adhesion performance: According to GB / T 23260-2009.

[0086] 4) Moisture and heat aging test (according to GB / T 1740-2007): Set the temperature to 70°C and the relative humidity to 95% for 500 hours, and observe the changes in the performance of the coiled material.

[0087] Example 2

[0088] (1) Moisture-proof and breathable self-adhesive asphalt waterproof membrane

[0089] The difference from Example 1 is that (1) the surface protection layer 1 is made of polyethylene film; (2) the moisture-proof barrier layer 2 has a thickness of 80 μm; and (3) the self-adhesive layer 5 has a thickness of 0.7 mm.

[0090] (2) Preparation method: Same as Example 1.

[0091] (3) Performance test: Same as Example 1.

[0092] Example 3

[0093] (1) Moisture-proof and breathable self-adhesive asphalt waterproof membrane

[0094] The difference from Example 1 is that: (1) the surface protection layer 1 is made of aluminum foil; (2) the porous air-permeable layer 3 has a thickness of 250 μm; and (3) the self-adhesive layer 5 has a thickness of 1.0 mm.

[0095] (2) Preparation method: Same as Example 1.

[0096] (3) Performance test: Same as Example 1.

[0097] Comparative Example 1

[0098] (1) Self-adhesive asphalt waterproof membrane

[0099] The difference from Example 1 is that the porous air-permeable layer 3 is a common polyester base material.

[0100] (2) Preparation method: Same as Example 1.

[0101] (3) Performance test: Same as Example 1.

[0102] Comparative Example 2

[0103] (1) Self-adhesive asphalt waterproof membrane

[0104] The difference from Example 1 is that the moisture-proof barrier layer 2 is not included.

[0105] (2) Preparation method: Same as Example 1.

[0106] (3) Performance test: Same as Example 1.

[0107] Comparative Example 3

[0108] (1) Self-adhesive asphalt waterproof membrane

[0109] The difference from Example 1 is that no organosilicon reinforcing agent containing silane groups is added to the self-adhesive layer 5 .

[0110] (2) Preparation method: Same as Example 1.

[0111] (3) Performance test: Same as Example 1.

[0112] Comparative Example 4

[0113] (1) Self-adhesive asphalt waterproof membrane

[0114] The difference from Example 1 is that the raw material composition and proportion of the moisture-proof barrier layer 2 are: 70% polyvinyl alcohol + 30% silicone hydrophobic modifier.

[0115] (2) Preparation method: Same as Example 1.

[0116] (3) Performance test: Same as Example 1.

[0117] Table 1 Comparison of data between examples and comparative examples

[0118]

[0119] Results and Discussion

[0120] The performance of the waterproof membranes of Examples 1-3 is significantly better than that of the waterproof membranes of Comparative Examples 1-4 in all aspects.

[0121] Examples 1-3 use a double-layer protection of a moisture-proof barrier layer 2 and a porous breathable layer 3, which can ensure that the material has good breathability, prevent liquid water from penetrating, and allow water vapor to pass through, ensuring that the base layer is dry and will not bulge or delaminate after construction. It can extend the service life by more than 20 years while maintaining high strength and waterproof performance.

[0122] It can be seen from Comparative Examples 1-4 that if the material bulges or peels, the bonding performance will be seriously affected, thereby affecting the durability of the coiled material; in addition, the organosilicon reinforcing agent containing silane groups helps to improve the bonding strength of the self-adhesive layer 5.

[0123] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed. The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application. The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application. These improvements and variations should also be regarded as the scope of protection of the present application.

Claims

1. A moisture-proof and breathable self-adhesive asphalt waterproof membrane, characterized in that: It comprises a surface protection layer (1), a moisture-proof barrier layer (2), a porous air-permeable layer (3), a modified asphalt layer (4), a self-adhesive layer (5), and an isolation film (6) which are arranged in sequence; Wherein, the moisture-proof barrier layer (2) is a composite layer made of a polymer moisture-proof agent and a hydrophobic modifier; The porous air-permeable layer (3) is made of expanded polytetrafluoroethylene film or porous polypropylene film.

2. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 1, characterized in that: The raw material composition and mass ratio of the moisture-proof barrier layer (2) are: 60%-80% of a high molecular moisture-proof agent and 20%-40% of a hydrophobic modifier; the thickness of the moisture-proof barrier layer (2) is 50 μm-100 μm.

3. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 2, characterized in that: The polymer moisture-proof agent is polyvinylidene fluoride, and the hydrophobic modifier is a siloxane hydrophobic modifier.

4. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 1, characterized in that: The micropore size of the porous breathable layer (3) is 0.1 μm-1 μm, and the thickness of the porous breathable layer (3) is 100 μm-300 μm.

5. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 4, characterized in that: The porous air-permeable layer (3) is an expanded polytetrafluoroethylene membrane or a porous polypropylene membrane.

6. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 1, characterized in that: The raw material composition and mass ratio of the modified asphalt layer (4) are: 88%-92% medium-hard petroleum asphalt, 8%-12% styrene-butadiene-styrene block copolymer; the thickness of the modified asphalt layer (4) is 1.5mm-2.5mm.

7. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 1, characterized in that: The material of the surface protection layer (1) is selected from one of mineral particles, polyethylene film or aluminum foil; The raw material composition and mass ratio of the self-adhesive layer (5) are: 55%-65% natural rubber, 25%-35% soft petroleum asphalt, and 10%-15% organic silicon reinforcing agent containing silane groups; the thickness of the self-adhesive layer (5) is 0.5mm-1.0mm.

8. The moisture-proof and breathable self-adhesive asphalt waterproof membrane according to any one of claims 1 to 7, characterized in that: The moisture-proof and breathable self-adhesive asphalt waterproof membrane is suitable for outdoor wet base waterproof buildings, and its performance includes: The air permeability reaches 1500g / (m 2 24h)-2000g / (m 2 24 hours); After soaking the cement mortar block in water for 24 hours, the moisture-proof and breathable self-adhesive asphalt waterproof membrane was pasted on it, compacted, and placed in an environment with a temperature of (25±2)°C and a relative humidity of (40±10)% for 7 days without bulging or delamination; The bonding strength of the dry base reaches 2.0MPa-2.5MPa, and the bonding strength of the wet base reaches 1.8MPa-2.3MPa; There is no obvious change after the durability test at a temperature of 70°C and a relative humidity of 95% for 500 hours.

9. A method for preparing a moisture-proof and breathable self-adhesive asphalt waterproof membrane, characterized in that: The method for preparing the moisture-proof and breathable self-adhesive asphalt waterproof membrane according to any one of claims 1 to 8 comprises: Melting and mixing medium-hard petroleum asphalt and styrene-butadiene-styrene block copolymer to obtain a modified asphalt base material; Hot-pressing the modified asphalt substrate and the porous air-permeable layer (3) to form a composite structure of the porous air-permeable layer (3) and the modified asphalt layer (4); coating the moisture-proof barrier layer (2) on the porous air-permeable layer (3), and coating the self-adhesive layer (5) on the modified asphalt layer (4); The surface protection layer (1) is prepared on the moisture-proof barrier layer (2), and the isolation film (6) is covered on the self-adhesive layer (5).

10. The method for preparing the moisture-proof and breathable self-adhesive asphalt waterproof membrane according to claim 9, characterized in that: The temperature of the melt mixing is 180° C.-200° C.; the temperature of the hot pressing compounding is 150° C.-180° C., the pressure is 0.3 MPa-0.5 MPa, and the time is 30 seconds-60 seconds.

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