Lap joint structure of modified asphalt waterproof coiled material

Abstract

The lap joint structure comprises at least two modified asphalt waterproof coiled materials which are in lap joint with each other, each modified asphalt waterproof coiled material comprises a protective film, a self-adhesive asphalt layer and a polypropylene fiber non-woven fabric layer, and a concave edge area and a convex edge area are arranged on the two sides of the lower surface of each self-adhesive asphalt layer respectively. The polypropylene non-woven fabric layer is embedded in the self-adhesive asphalt layer, one edge part of the polypropylene non-woven fabric layer extends outwards and is exposed and connected to the surface of a concave edge area of the self-adhesive asphalt layer, and the polypropylene non-woven fabric layer is formed by weft knitting and interweaving two strands of polypropylene fibers with different single fiber numbers; compared with the prior art, the self-adhesive asphalt layers of two adjacent modified asphalt waterproof coiled materials can be better adhered together, the adhesion is tighter, the problems of separation, edge warping, cracking, leakage or poor sealing performance and the like of the lap joint part of the waterproof coiled materials can be avoided, and the waterproof coiled materials can be conveniently subjected to cold construction paving operation all the year round.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coiled materials, and more specifically to an overlapping structure of a modified asphalt waterproof coiled material. Background Art

[0002] Modified asphalt waterproofing membrane generally includes a protective film, a self-adhesive polymer modified asphalt layer and an isolation layer which are stacked in sequence. The protective film can usually be made of polymer materials such as aluminum film, HDPE cross-laminated film, PET film, etc. This type of waterproofing membrane is light in weight, can form full adhesion with the base layer, has good waterproof properties, and is widely used in building waterproofing projects.

[0003] However, existing modified asphalt waterproof membranes generally have the following shortcomings: when the edges of two modified asphalt waterproof membranes need to be overlapped together (especially in winter), the overlapped parts are prone to detachment, warping, cracking, leakage or poor sealing. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide an overlapping structure of a modified asphalt waterproof membrane that can avoid problems such as detachment, warping, cracking, leakage or poor sealing at the overlapping parts of the waterproof membrane.

[0005] To achieve the above-mentioned purpose, the present invention provides an overlap structure of a modified asphalt waterproofing membrane, comprising at least two pieces of modified asphalt waterproofing membrane overlapped with each other, each piece of modified asphalt waterproofing membrane comprising a protective film, a self-adhesive asphalt layer and a polypropylene non-woven fabric layer, the protective film is connected to the upper surface of the self-adhesive asphalt layer, one side of the lower surface of the self-adhesive asphalt layer is provided with a concave edge area extending along the length direction thereof and recessed upward, the other side of the lower surface of the self-adhesive asphalt layer is provided with a convex edge area extending along the length direction thereof and protruding outward, the polypropylene non-woven fabric layer is embedded in the interior of the self-adhesive asphalt layer, and an edge portion of the polypropylene non-woven fabric layer extends outward and protrudes outward. The polypropylene non-woven fabric layer is exposed and connected to the surface of the concave edge area of ​​the self-adhesive asphalt layer. The polypropylene non-woven fabric layer is formed by weft knitting two strands of polypropylene fibers with different single fiber numbers. The first polypropylene fiber with a smaller single fiber number is used as the outer surface of the polypropylene non-woven fabric layer to be connected to the convex edge area of ​​the self-adhesive asphalt layer of another modified asphalt waterproof membrane. The second polypropylene fiber with a larger single fiber number is used as the inner surface to be connected to the concave edge area of ​​the self-adhesive asphalt layer. When two adjacent modified asphalt waterproof membranes are overlapped with each other, the edge of the polypropylene non-woven fabric layer exposed on the concave edge area of ​​one of the modified asphalt waterproof membranes can be connected to the convex edge area of ​​the self-adhesive asphalt layer of another adjacent modified asphalt waterproof membrane.

[0006] Preferably, the first polypropylene fibers of the polypropylene non-woven fabric layer form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer form a plain weave shape.

[0007] Preferably, the number of single fibers of the first polypropylene fiber is set to 6F-32F, and the number of single fibers of the second polypropylene fiber is set to 48F-72F.

[0008] Preferably, the protective film is an aluminum film.

[0009] Preferably, the self-adhesive asphalt layer comprises the following raw materials in parts by weight: 30-35 parts of asphalt, 10-15 parts of epoxy resin, 5-10 parts of hydrogenated acrylic rosin, 5-8 parts of silicon carbide nanofibers, 10-20 parts of modified filler, 2-6 parts of plasticizer, 4-8 parts of SBS modifier, 1-5 parts of antioxidant, 1-5 parts of stabilizer, 1-5 parts of defoaming agent, 5-8 parts of catalyst, and 5-10 parts of flame retardant masterbatch.

[0010] Preferably, the asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 70# petroleum asphalt, 90# petroleum asphalt or 200# petroleum asphalt, the epoxy resin is set to bisphenol A type epoxy resin, and the melt index of the SBS modifier is 15-20g / min.

[0011] Preferably, the modified filler is prepared by the following steps: (1) dispersing aluminum silicate and a silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 20-30 minutes, heating to 70-80°C, stirring for 0.5-1h, centrifuging, and repeatedly washing with anhydrous ethanol for 2-3 times, and finally vacuum drying at 70-90°C for 1-2h, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, and then heating to 70-90°C and keeping warm for 2-4h to obtain a modified filler.

[0012] Preferably, the stabilizer is hydroxyethyl cellulose ether or calcium stearate, the plasticizer is chlorinated palm oil methyl ester, and the catalyst is an organic tin catalyst, an organic bismuth catalyst or an amine catalyst.

[0013] Preferably, the anti-aging agent is isopropylated triphenyl phosphate, and the defoaming agent is a modified polyether defoaming agent.

[0014] Preferably, the flame retardant masterbatch comprises the following raw materials in parts by weight: 10-15 parts of aluminum hydroxide, 10-15 parts of chlorinated paraffin, 30-45 parts of polyolefin resin, 4-6 parts of alkylphenol polyoxyethylene ether, 5-10 parts of 3-isocyanatepropyltrimethoxysilane, and 5-10 parts of zinc stearate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. An edge portion of the polypropylene non-woven fabric layer of the present invention extends outward and is exposed and connected to the surface of the concave edge area of ​​the self-adhesive asphalt layer. The polypropylene non-woven fabric layer is formed by weft-knitting two strands of polypropylene fibers with different single fiber numbers. The polypropylene fibers with a large single fiber number have better absorption and permeability than those with a small single fiber number. When two adjacent modified asphalt waterproof membranes are overlapped with each other, the self-adhesive asphalt layer of the rear modified asphalt waterproof membrane can penetrate more quickly from the outside of the polypropylene non-woven fabric layer of the front modified asphalt waterproof membrane to the inside of the polypropylene non-woven fabric layer under the unidirectional material guide effect of the first polypropylene fiber and the second polypropylene fiber of the polypropylene non-woven fabric layer of the front modified asphalt waterproof membrane, so that the self-adhesive asphalt layers of the two adjacent modified asphalt waterproof membranes can be better bonded to each other and the fit is more tight, which can avoid the problems of detachment, warping, cracking, leakage or poor sealing at the overlapping part of the waterproof membrane, and facilitate the cold construction and paving operation of the waterproof membrane in all seasons.

[0017] 2. The protective film of the present invention is connected to the upper surface of the self-adhesive asphalt layer, and one side of the lower surface of the self-adhesive asphalt layer is provided with a concave edge area extending along its length direction and recessed upward, and the other side of the lower surface of the self-adhesive asphalt layer is provided with a convex edge area extending along its length direction and protruding outward, and the polypropylene non-woven fabric layer is embedded in the interior of the self-adhesive asphalt layer, and an edge portion of the polypropylene non-woven fabric layer extends outward and is exposed and connected to the surface of the concave edge area of ​​the self-adhesive asphalt layer. The structural design is reasonable, the preparation is convenient, the cost is low, and it is convenient for the laying and overlapping of the waterproof membrane.

[0018] 3. The polypropylene non-woven fabric layer of the present invention is embedded in the interior of the self-adhesive asphalt layer, which can improve the tensile and tear resistance of the waterproof roll.

[0019] 4. The self-adhesive asphalt layer of the present invention is composed of asphalt, epoxy resin, hydrogenated acrylic rosin, silicon carbide nanofiber, modified filler, plasticizer, SBS modifier, anti-aging agent, stabilizer, defoamer, catalyst, and flame retardant masterbatch. It has a reasonable formula design, high self-adhesion, excellent waterproof effect, flame retardant effect and heat insulation effect, good weather resistance and high temperature resistance, excellent mechanical properties, high joint peeling strength, and long service life. After construction, the self-adhesive asphalt layer can form a gapless bond with the concrete, eliminating the hidden danger of water seepage between layers and greatly improving the waterproof performance.

[0020] 5. The asphalt, epoxy resin and hydrogenated acrylic rosin of the present invention can coordinate with each other, greatly improving the bonding strength of the self-adhesive asphalt layer, so that the waterproof membrane and concrete can be strongly bonded together.

[0021] 6. The modified filler of the present invention is a modified flame retardant and heat insulating filler, which improves the flame retardant effect and heat insulating effect of the waterproof coiled material.

[0022] 7. The present invention adds silicon carbide nanofibers, which can greatly improve the mechanical properties of the waterproof membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of a single modified asphalt waterproofing membrane provided by an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the bottom structure of a single modified asphalt waterproofing membrane provided by an embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the overlapping structure of the modified asphalt waterproof membrane provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Please refer to Figure 1 and Figure 2 The figure shows a modified asphalt waterproofing membrane, which includes a protective film 1, a self-adhesive asphalt layer 2 and a polypropylene non-woven fabric layer 3, wherein the protective film 1 is connected to the upper surface of the self-adhesive asphalt layer 2, and one side of the lower surface of the self-adhesive asphalt layer 2 is provided with a concave edge area 21 extending along its length direction and recessed upward, and the other side of the lower surface of the self-adhesive asphalt layer is provided with a convex edge area 22 extending along its length direction and protruding outward, and the polypropylene non-woven fabric layer 3 is embedded in the interior of the self-adhesive asphalt layer 2, and an edge portion of the polypropylene non-woven fabric layer 3 extends outward and is exposed and connected to the surface of the concave edge area 21 of the self-adhesive asphalt layer 2.

[0029] Example 1

[0030] Embodiment 1 of the present invention provides a modified asphalt waterproofing membrane, comprising a protective film 1, a self-adhesive asphalt layer 2 and a polypropylene non-woven fabric layer 3.

[0031] The protective film 1 is configured as an aluminum film.

[0032] The self-adhesive asphalt layer 2 includes the following raw materials in parts by weight: 30 parts of asphalt, 10 parts of epoxy resin, 5 parts of hydrogenated acrylic rosin, 5 parts of silicon carbide nanofibers, 10 parts of modified fillers, 2 parts of plasticizers, 4 parts of SBS modifiers, 1 part of antioxidants, 1 part of stabilizers, 1 part of defoaming agents, 5 parts of catalysts, and 5 parts of flame retardant masterbatches.

[0033] The asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 70# petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, and the melting index of the SBS modifier is 15g / min.

[0034] The modified filler is prepared by the following steps: (1) dispersing aluminum silicate and silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 20 minutes, heating to 70°C, stirring for 1 hour, centrifugally separating, and repeatedly washing with anhydrous ethanol twice, finally vacuum drying at 70°C for 2 hours, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, heating to 70°C, and keeping warm for 4 hours to obtain a modified filler. The silane coupling agent is vinyltrimethoxysilane.

[0035] The stabilizer is hydroxyethyl cellulose ether, the plasticizer is chlorinated palm oil methyl ester, the catalyst is an organic tin catalyst, the anti-aging agent is isopropylated triphenyl phosphate, and the defoamer is a modified polyether defoamer.

[0036] The flame retardant masterbatch includes the following raw materials in parts by weight: 10 parts of aluminum hydroxide, 10 parts of chlorinated paraffin, 30 parts of polyolefin resin, 4 parts of alkylphenol polyoxyethylene ether, 5 parts of 3-isocyanate propyltrimethoxysilane, and 5 parts of zinc stearate.

[0037] The polypropylene non-woven fabric layer 3 is formed by weft knitting two strands of polypropylene fibers with different single fiber numbers. The first polypropylene fiber with a smaller single fiber number is used as the outer surface of the polypropylene non-woven fabric layer 3 to be connected to the convex edge area 22 of the self-adhesive asphalt layer 2 of another modified asphalt waterproof membrane, and the second polypropylene fiber with a larger single fiber number is used as the inner surface to be connected to the concave edge area 21 of the self-adhesive asphalt layer 2.

[0038] The first polypropylene fibers of the polypropylene non-woven fabric layer 3 form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer 3 form a plain weave shape.

[0039] The single fiber count of the first polypropylene fiber is set to 10F, and the single fiber count of the second polypropylene fiber is set to 48F.

[0040] Example 2

[0041] Embodiment 2 of the present invention provides a modified asphalt waterproofing membrane, comprising a protective film 1, a self-adhesive asphalt layer 2 and a polypropylene non-woven fabric layer 3.

[0042] The protective film 1 is configured as an aluminum film.

[0043] The self-adhesive asphalt layer 2 includes the following raw materials in parts by weight: 32 parts of asphalt, 12 parts of epoxy resin, 8 parts of hydrogenated acrylic rosin, 6 parts of silicon carbide nanofibers, 15 parts of modified fillers, 4 parts of plasticizers, 6 parts of SBS modifiers, 3 parts of antioxidants, 3 parts of stabilizers, 3 parts of defoaming agents, 6 parts of catalysts, and 8 parts of flame retardant masterbatches.

[0044] The asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 90# petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, and the melting index of the SBS modifier is 18g / min.

[0045] The modified filler is prepared by the following steps: (1) dispersing aluminum silicate and a silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 25 minutes, heating to 78°C, stirring for 0.8 hours, centrifuging, and repeatedly washing with anhydrous ethanol for 3 times, and finally vacuum drying at 80°C for 1.5 hours, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, heating to 80°C, and keeping warm for 3 hours to obtain a modified filler.

[0046] The stabilizer is calcium stearate, the plasticizer is chlorinated palm oil methyl ester, the catalyst is an organic bismuth catalyst, the anti-aging agent is isopropylated triphenyl phosphate, and the defoamer is a modified polyether defoamer.

[0047] The flame retardant masterbatch includes the following raw materials in parts by weight: 13 parts of aluminum hydroxide, 13 parts of chlorinated paraffin, 40 parts of polyolefin resin, 5 parts of alkylphenol polyoxyethylene ether, 8 parts of 3-isocyanate propyltrimethoxysilane, and 8 parts of zinc stearate.

[0048] The polypropylene non-woven fabric layer 3 is formed by weft knitting two strands of polypropylene fibers with different single fiber counts. The first polypropylene fiber with a smaller single fiber count is used as the outer surface of the polypropylene non-woven fabric layer 3 to connect with the convex edge area 22 of the self-adhesive asphalt layer 2 of another modified asphalt waterproofing membrane, and the second polypropylene fiber with a larger single fiber count is used as the inner surface to connect with the concave edge area 21 of the self-adhesive asphalt layer 2.

[0049] The first polypropylene fibers of the polypropylene non-woven fabric layer 3 form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer 3 form a plain weave shape.

[0050] The single fiber count of the first polypropylene fiber is set to 22F, and the single fiber count of the second polypropylene fiber is set to 56F.

[0051] Example 3

[0052] Embodiment 3 of the present invention provides a modified asphalt waterproofing membrane, comprising a protective membrane 1, a self-adhesive asphalt layer 2 and a polypropylene non-woven fabric layer 3.

[0053] The protective film 1 is configured as an aluminum film.

[0054] The self-adhesive asphalt layer 2 includes the following raw materials in parts by weight: 35 parts of asphalt, 15 parts of epoxy resin, 10 parts of hydrogenated acrylic rosin, 8 parts of silicon carbide nanofibers, 20 parts of modified fillers, 6 parts of plasticizers, 8 parts of SBS modifiers, 5 parts of antioxidants, 5 parts of stabilizers, 5 parts of defoaming agents, 8 parts of catalysts, and 10 parts of flame retardant masterbatches.

[0055] The asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 200# petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, and the melting index of the SBS modifier is 20g / min.

[0056] The modified filler is prepared by the following steps: (1) dispersing aluminum silicate and a silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 30 minutes, heating to 80°C, stirring for 0.5 hours, centrifuging, and repeatedly washing with anhydrous ethanol for 3 times, and finally vacuum drying at 90°C for 1 hour, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, and then heating to 90°C and keeping warm for 2 hours to obtain a modified filler.

[0057] The stabilizer is calcium stearate, the plasticizer is chlorinated palm oil methyl ester, the catalyst is an amine catalyst, the anti-aging agent is isopropylated triphenyl phosphate, and the defoamer is a modified polyether defoamer.

[0058] The flame retardant masterbatch includes the following raw materials in parts by weight: 15 parts of aluminum hydroxide, 15 parts of chlorinated paraffin, 45 parts of polyolefin resin, 6 parts of alkylphenol polyoxyethylene ether, 10 parts of 3-isocyanate propyltrimethoxysilane, and 10 parts of zinc stearate.

[0059] The polypropylene non-woven fabric layer 3 is formed by weft knitting two strands of polypropylene fibers with different single fiber counts. The first polypropylene fiber with a smaller single fiber count is used as the outer surface of the polypropylene non-woven fabric layer 3 to connect with the convex edge area 22 of the self-adhesive asphalt layer 2 of another modified asphalt waterproofing membrane, and the second polypropylene fiber with a larger single fiber count is used as the inner surface to connect with the concave edge area 21 of the self-adhesive asphalt layer 2.

[0060] The first polypropylene fibers of the polypropylene non-woven fabric layer 3 form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer 3 form a plain weave shape.

[0061] The single fiber count of the first polypropylene fiber is set to 32F, and the single fiber count of the second polypropylene fiber is set to 72F.

[0062] Example 4

[0063] Embodiment 4 of the present invention provides a modified asphalt waterproofing membrane, comprising a protective membrane 1, a self-adhesive asphalt layer 2 and a polypropylene non-woven fabric layer 3.

[0064] The protective film 1 is configured as an aluminum film.

[0065] The self-adhesive asphalt layer 2 includes the following raw materials in parts by weight: 35 parts of asphalt, 10 parts of epoxy resin, 5 parts of hydrogenated acrylic rosin, 6 parts of silicon carbide nanofibers, 15 parts of modified fillers, 3 parts of plasticizers, 5 parts of SBS modifiers, 2 parts of anti-aging agents, 1 part of stabilizers, 4 parts of defoaming agents, 5 parts of catalysts, and 8 parts of flame retardant masterbatches.

[0066] The asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 70# petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, and the melting index of the SBS modifier is 15g / min.

[0067] The modified filler is prepared by the following steps: (1) dispersing aluminum silicate and a silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 30 minutes, heating to 80°C, stirring for 1 hour, centrifuging, and repeatedly washing with anhydrous ethanol for 3 times, and finally vacuum drying at 90°C for 1 hour, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, and then heating to 90°C and keeping warm for 2 hours to obtain a modified filler.

[0068] The stabilizer is hydroxyethyl cellulose ether, the plasticizer is chlorinated palm oil methyl ester, the catalyst is an organic tin catalyst, the anti-aging agent is isopropylated triphenyl phosphate, and the defoamer is a modified polyether defoamer.

[0069] The flame retardant masterbatch includes the following raw materials in parts by weight: 10 parts of aluminum hydroxide, 10 parts of chlorinated paraffin, 32 parts of polyolefin resin, 4 parts of alkylphenol polyoxyethylene ether, 5 parts of 3-isocyanate propyltrimethoxysilane, and 5 parts of zinc stearate.

[0070] The polypropylene non-woven fabric layer 3 is formed by weft knitting two strands of polypropylene fibers with different single fiber counts. The first polypropylene fiber with a smaller single fiber count is used as the outer surface of the polypropylene non-woven fabric layer 3 to connect with the convex edge area 22 of the self-adhesive asphalt layer 2 of another modified asphalt waterproofing membrane, and the second polypropylene fiber with a larger single fiber count is used as the inner surface to connect with the concave edge area 21 of the self-adhesive asphalt layer 2.

[0071] The first polypropylene fibers of the polypropylene non-woven fabric layer 3 form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer 3 form a plain weave shape.

[0072] The single fiber count of the first polypropylene fiber is set to 32F, and the single fiber count of the second polypropylene fiber is set to 48F.

[0073] like Figure 3 As shown in the figure, a lap joint structure of a modified asphalt waterproof membrane is shown, comprising at least two modified asphalt waterproof membranes overlapped with each other. When two adjacent modified asphalt waterproof membranes are overlapped with each other, the edge portion of the polypropylene non-woven fabric layer 3 exposed on the concave edge area 21 of one of the modified asphalt waterproof membranes can be connected to the convex edge area 22 of the self-adhesive asphalt layer 2 of another adjacent modified asphalt waterproof membrane.

[0074] The experimental test results are as follows:

[0075] 1. Sheet to sheet peel strength, 4.5-5.2N / mm;

[0076] 2. Good mechanical properties, its impact strength reaches 58-67kg / cm, elongation at break is 605-650%, and puncture strength reaches 60-75N;

[0077] 3. Good flame retardant effect, the limiting oxygen index is 36.5-39%, after burning for 10 seconds under the standard flame, the fire source is removed, the flame goes out within 2-3 seconds, and no molten droplets appear;

[0078] 4. Good thermal insulation effect, waterproof membrane with thickness of 5-9mm and thermal conductivity of 0.023-0.035W / m·k;

[0079] 5. Good waterproof effect, 0.3MPa, 120min, impermeable;

[0080] 6. Good aging resistance. After accelerated aging for 720 hours at 115°C, the maximum tensile retention rate of the waterproof membrane is 95-98%, and the elongation retention rate is 95-97%.

[0081] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A lap joint structure of a modified asphalt waterproofing membrane, comprising at least two pieces of modified asphalt waterproofing membranes overlapped with each other, characterized in that: Each modified asphalt waterproofing membrane comprises a protective film, a self-adhesive asphalt layer and a polypropylene non-woven fabric layer, wherein the protective film is connected to the upper surface of the self-adhesive asphalt layer, one side of the lower surface of the self-adhesive asphalt layer is provided with a concave edge area extending along its length direction and recessed upward, and the other side of the lower surface of the self-adhesive asphalt layer is provided with a convex edge area extending along its length direction and protruding outward, the polypropylene non-woven fabric layer is embedded in the interior of the self-adhesive asphalt layer, an edge portion of the polypropylene non-woven fabric layer extends outward and is exposed and connected to the surface of the concave edge area of ​​the self-adhesive asphalt layer, and the polypropylene non-woven fabric layer is composed of Two strands of polypropylene fibers with different single fiber numbers are interwoven by weft knitting. The first polypropylene fiber with a smaller single fiber number is used as the outer surface of the polypropylene non-woven fabric layer to be connected with the convex edge area of ​​the self-adhesive asphalt layer of another modified asphalt waterproof membrane, and the second polypropylene fiber with a larger single fiber number is used as the inner surface to be connected with the concave edge area of ​​the self-adhesive asphalt layer. When two adjacent modified asphalt waterproof membranes are overlapped with each other, the edge of the polypropylene non-woven fabric layer exposed on the concave edge area of ​​one of the modified asphalt waterproof membranes can be connected with the convex edge area of ​​the self-adhesive asphalt layer of another adjacent modified asphalt waterproof membrane.

2. The overlapping structure of a modified asphalt waterproofing membrane according to claim 1 is characterized in that: The first polypropylene fibers of the polypropylene non-woven fabric layer form a hexagonal honeycomb shape, and the second polypropylene fibers of the polypropylene non-woven fabric layer form a plain weave shape.

3. The overlapping structure of a modified asphalt waterproofing membrane according to claim 1 is characterized in that: The single fiber count of the first polypropylene fiber is set to 6F-32F, and the single fiber count of the second polypropylene fiber is set to 48F-72F.

4. The overlapping structure of a modified asphalt waterproofing membrane according to claim 1 is characterized in that: The protective film is configured as an aluminum film.

5. The overlapping structure of a modified asphalt waterproofing membrane according to claim 1 is characterized in that: The self-adhesive asphalt layer includes the following raw materials in parts by weight: 30-35 parts of asphalt, 10-15 parts of epoxy resin, 5-10 parts of hydrogenated acrylic rosin, 5-8 parts of silicon carbide nanofibers, 10-20 parts of modified fillers, 2-6 parts of plasticizers, 4-8 parts of SBS modifiers, 1-5 parts of anti-aging agents, 1-5 parts of stabilizers, 1-5 parts of defoaming agents, 5-8 parts of catalysts, and 5-10 parts of flame retardant masterbatches.

6. The overlapping structure of a modified asphalt waterproofing membrane according to claim 5 is characterized in that: The asphalt is a mixture of petroleum asphalt and natural asphalt in a weight ratio of 3:1, the petroleum asphalt is 70# petroleum asphalt, 90# petroleum asphalt or 200# petroleum asphalt, the epoxy resin is set to bisphenol A type epoxy resin, and the melting index of the SBS modifier is 15-20g / min.

7. The overlapping structure of a modified asphalt waterproofing membrane according to claim 5 is characterized in that: The modified filler is prepared by the following steps: (1) dispersing aluminum silicate and a silane coupling agent in an ethanol aqueous solution, ultrasonically treating for 20-30 minutes, heating to 70-80°C, stirring for 0.5-1h, centrifuging, and repeatedly washing with anhydrous ethanol for 2-3 times, and finally vacuum drying at 70-90°C for 1-2h, grinding, and obtaining a grafted filler; (2) mixing and stirring boric acid, hexafluorodianhydride, aminopropyl-terminated polydimethylsiloxane and the grafted filler, adding polyvinyl alcohol and mixing evenly, freeze-drying, and then heating to 70-90°C and keeping warm for 2-4h to obtain a modified filler.

8. The overlapping structure of a modified asphalt waterproofing membrane according to claim 5 is characterized in that: The stabilizer is hydroxyethyl cellulose ether or calcium stearate, the plasticizer is chlorinated palm oil methyl ester, and the catalyst is an organic tin catalyst, an organic bismuth catalyst or an amine catalyst.

9. The overlapping structure of a modified asphalt waterproofing membrane according to claim 5, characterized in that: The anti-aging agent is isopropylated triphenyl phosphate, and the defoaming agent is a modified polyether defoaming agent.

10. The overlapping structure of a modified asphalt waterproofing membrane according to claim 5, characterized in that: The flame retardant masterbatch comprises the following raw materials in parts by weight: 10-15 parts of aluminum hydroxide, 10-15 parts of chlorinated paraffin, 30-45 parts of polyolefin resin, 4-6 parts of alkylphenol polyoxyethylene ether, 5-10 parts of 3-isocyanate propyltrimethoxysilane, and 5-10 parts of zinc stearate.

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