Composition for asphalt waterproof coiled material, asphalt waterproof coiled material as well as preparation method and application of asphalt waterproof coiled material

Abstract

The invention relates to the technical field of waterproof coiled materials, and discloses a composition for an asphalt waterproof coiled material, the asphalt waterproof coiled material and a preparation method and application of the asphalt waterproof coiled material. The composition contains a main agent and an auxiliary agent, the main agent contains matrix asphalt, SBS, a heat stabilizer, a softening agent, a nucleating agent and carbonate; the total weight of the composition is 100 parts by weight, the content of the matrix asphalt is 45-50 parts by weight, and the content of the SBS is 9.5-15 parts by weight. The asphalt waterproof coiled material provided by the invention has the advantages of light weight and high construction efficiency, greatly saves labor and mechanical cost in the aspects of production, storage, transportation, construction and the like, has high tensile strength and bonding strength and good heat preservation and sound insulation effects, and meets the waterproof requirements of special scenes.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, specifically to compositions for bituminous waterproof membranes, bituminous waterproof membranes, their preparation methods, and applications. Background Technology

[0002] The application of building waterproofing materials is a key aspect of the development of the construction industry, and modified bitumen waterproofing membranes are an important component of all building waterproofing materials.

[0003] Compared to conventional waterproof membranes, mineral-granule modified bitumen waterproof membranes, with their dense shale flakes on the upper surface, effectively block ultraviolet rays from damaging and aging the membrane itself. Therefore, they are among the few waterproof membranes that can be used outdoors. During construction, they exhibit good abrasion resistance, are not as "delicate" as conventional modified bitumen waterproof membranes, and there is no need to worry about the upper surface membrane breaking down under weathering. They also possess excellent aging resistance and are widely used in waterproofing projects for roofs and basements in industrial and civil buildings, as well as for waterproofing and damp-proofing in roofs, gardens, roads, bridges, tunnels, parking lots, and other projects.

[0004] However, existing mineral-modified bitumen waterproof membranes are quite heavy, requiring more manual labor and machinery for transportation and installation, consuming significant human and material resources. Furthermore, slow installation speeds can delay the construction period and reduce the waterproofing effect.

[0005] In addition, existing lightweight waterproof membranes have uneven cell structure or delamination due to water foaming, resulting in reduced tensile strength and adhesion, and decreased waterproofing effect.

[0006] For example, CN117922117A discloses a super-strong puncture-resistant polymer waterproof membrane and equipment. This waterproof membrane, from top to bottom, consists of an alloy laminate, an upper modified bitumen layer, a base layer, a lower modified bitumen layer, and a silicone-coated release membrane, achieving root penetration resistance. However, the waterproof membrane provided by this prior art is relatively heavy, requiring more investment in transportation and construction.

[0007] CN116987459A discloses a waterproof membrane that uses foamed microspheres instead of traditional foaming agents to foam asphalt, forming a dense microporous structure. It also uses filler microspheres and foamed microspheres as lightweight fillers to replace a small amount of existing mineral powder fillers, thus producing a lightweight waterproof membrane that improves handling and construction convenience. However, this waterproof membrane suffers from difficulty in ensuring uniform foaming, resulting in poor membrane strength and aging resistance.

[0008] Therefore, it is necessary in this field to provide a lightweight, high-strength mineral bitumen waterproof membrane. Summary of the Invention

[0009] The purpose of this invention is to overcome the problem that existing mineral bitumen waterproof membranes cannot simultaneously achieve lightweight, high tensile strength, and high adhesion.

[0010] To achieve the above objectives, a first aspect of the present invention provides a composition for asphalt waterproof membrane, the composition comprising a main agent and an additive; said main agent comprising base asphalt, SBS, a heat stabilizer, a softener, a nucleating agent, and a carbonate; Based on 100 parts by weight of the total composition, the content of the base bitumen is 45-50 parts by weight, the content of SBS is 9.5-15 parts by weight, the content of the heat stabilizer is 1-2 parts by weight, the content of the softener is 9-12 parts by weight, the content of the nucleating agent is 1-3 parts by weight, and the content of the carbonate is 0.5-2 parts by weight. The SBS is a styrene-butadiene-styrene block copolymer with a number average molecular weight of 250,000-400,000. The content of structural units provided by styrene is 30-35 wt%, the content of structural units provided by butadiene is 65-70 wt%, and the Shore A hardness is 60-95 degrees.

[0011] A second aspect of the present invention provides a method for preparing an asphalt-waterproof membrane, the method comprising using the components of the composition described in the first aspect of the present invention, including: (1) The base asphalt, SBS and softener are mixed for the first time to obtain mixture I; (2) Mix the mixture I with the heat stabilizer, nucleating agent and dispersant in the additives to obtain mixture II; (3) Mix the mixture II with the filler in the additives for a third time to obtain mixture III; (4) Mix the mixture III with carbonate and pH adjuster in the additives for the fourth time to obtain modified asphalt mixture; (5) The modified asphalt mixture is molded to obtain the asphalt waterproof membrane.

[0012] A third aspect of the present invention provides a bituminous waterproof membrane prepared by the method described in the second aspect.

[0013] The fourth aspect of the present invention provides the application of the bitumen waterproof membrane described in the third aspect in the field of exposed waterproofing of building roofs.

[0014] The technical solution of the present invention has at least the following advantages: (1) The bitumen waterproof membrane (preferably carbonate mineral modified bitumen waterproof membrane) provided by the present invention has the advantages of light weight and high construction efficiency. Compared with the existing mineral modified bitumen waterproof membrane, it greatly saves labor and machinery costs in production, storage, transportation and construction.

[0015] (2) The asphalt waterproof membrane provided by the present invention has high tensile strength and bonding strength, as well as good thermal insulation and sound insulation effects, and meets the waterproof requirements of special scenarios.

[0016] (3) The production operation of the asphalt waterproof membrane provided by the present invention is simple, and the product does not pose a risk of releasing harmful substances, which is in line with the trend of green development. Attached Figure Description

[0017] Figure 1 This is a SEM image of the microbubble structure of the cross-section of the asphalt waterproof membrane provided by this invention. Detailed Implementation

[0018] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0019] As previously described, a first aspect of the present invention provides a composition for bituminous waterproof membrane, the composition comprising a main agent and additives; said main agent comprising base bitumen, SBS, heat stabilizer, softener, nucleating agent and carbonate; Based on 100 parts by weight of the total composition, the content of the base bitumen is 45-50 parts by weight, the content of SBS is 9.5-15 parts by weight, the content of the heat stabilizer is 1-2 parts by weight, the content of the softener is 9-12 parts by weight, the content of the nucleating agent is 1-3 parts by weight, and the content of the carbonate is 0.5-2 parts by weight. The SBS is a styrene-butadiene-styrene block copolymer with a number average molecular weight of 250,000-400,000. The content of structural units provided by styrene is 30-35 wt%, the content of structural units provided by butadiene is 65-70 wt%, and the Shore A hardness is 60-95 degrees.

[0020] Preferably, the heat stabilizer has a melt viscosity of 800-1500 cP at 140°C.

[0021] Preferably, the heat stabilizer is polypropylene wax and / or polyethylene wax.

[0022] More preferably, the heat stabilizer is polyethylene wax.

[0023] Preferably, the additive contains a pH adjuster, a dispersant, and a filler; based on 100 parts by weight of the total composition, the pH adjuster contains 0.5-2 parts by weight, the dispersant contains 0.5-2 parts by weight, and the filler contains 25-35 parts by weight.

[0024] Preferably, the base bitumen is selected from at least one of AH-70, AH-90, and AH-100.

[0025] In this invention, AH-70, AH-90, and AH-110 represent different grades of asphalt; wherein, AH-70 has a penetration of 60-80 (0.1 mm) at 25°C; AH-90 has a penetration of 80-100 (0.1 mm) at 25°C; and AH-100 has a penetration of 90-110 (0.1 mm) at 25°C.

[0026] Preferably, the softener is at least one selected from naphthenic oil, base oil, and aromatic oil. More preferably, the softener is an aromatic oil.

[0027] Preferably, the nucleating agent is nano-montmorillonite, and the nano-montmorillonite sheets have a length of 50-200 nm and a width of 10-50 nm.

[0028] In a preferred embodiment, the carbonate is sodium bicarbonate.

[0029] Preferably, the pH adjuster is an organic acid, which is selected from at least one of citric acid, phosphate, and borate.

[0030] More preferably, the pH adjuster is citric acid.

[0031] Preferably, the dispersant is at least one of fatty acids, aliphatic amides, esters, paraffins, metal soaps, and low-molecular-weight waxes.

[0032] In this invention, the fatty acids may be selected from at least one of stearic acid, palmitic acid, and oleic acid; the aliphatic amides may be selected from at least one of stearamide, erucamide, and laurylamide; the esters may be selected from at least one of sorbitan monooleate, butyl stearate, and glyceryl monostearate; the paraffins may be selected from at least one of microcrystalline wax and polyethylene wax; the metal soaps may be selected from at least one of zinc stearate and calcium stearate; and the low molecular weight waxes may be selected from at least one of oxidized polyethylene wax and polypropylene wax.

[0033] More preferably, the dispersant is sorbitan monooleate.

[0034] Preferably, the filler is selected from at least one of talc and heavy calcium carbonate.

[0035] More preferably, the filler is talc.

[0036] As previously described, a second aspect of the present invention provides a method for preparing an asphalt-waterproof membrane, the method comprising using the components of the composition described in the first aspect of the present invention, including: (1) The base asphalt, SBS and softener are mixed for the first time to obtain mixture I; (2) Mix the mixture I with the heat stabilizer, nucleating agent and dispersant in the additives to obtain mixture II; (3) Mix the mixture II with the filler in the additives for a third time to obtain mixture III; (4) Mix the mixture III with carbonate and pH adjuster in the additives for the fourth time to obtain modified asphalt mixture; (5) The modified asphalt mixture is molded to obtain the asphalt waterproof membrane.

[0037] Preferably, in step (1), the conditions for the first mixing include: a stirring speed of 700-800 rpm, a temperature of 170-180°C, and a stirring time of 1-5 h.

[0038] More preferably, in step (2), the conditions for the second mixing include: a stirring speed of 800-1000 rpm, a temperature of 170-180°C, and a stirring time of 0.5-3 h.

[0039] Preferably, in step (2), during the second mixing process, the heat stabilizer is completely dissolved to ensure that the nucleating agent is uniformly dispersed without agglomeration. The inventors of this invention have found that, in this preferred embodiment, the bitumen waterproof membrane provided by this invention has higher cell uniformity and tensile strength.

[0040] Preferably, in step (3), the conditions for the third mixing include: a stirring speed of 600-800 rpm and a stirring time of 0.5-2 h.

[0041] Preferably, the method of the present invention may further include: controlling conditions such that the temperature of the third mixed system gradually decreases.

[0042] Further preferably, in step (3), the operation of gradually reducing the temperature of the third mixture system may include: adding the filler to the third mixture system in 2-4 batches, with each batch independently accounting for 20-50 wt% of the total filler; controlling the conditions such that after each batch of filler is added, the temperature of the third mixture system decreases by 3-5°C; after all the filler has been added, the temperature of the third mixture system is 160-170°C. The inventors of this invention have found that, under this preferred condition, the asphalt waterproof membrane provided by this invention has stronger tensile strength and adhesion.

[0043] In a preferred embodiment, in step (4), the conditions for the fourth mixing include: a stirring speed of 400-500 rpm, a temperature of 160-170°C, and a stirring time of 0.5-2 h.

[0044] More preferably, in step (5), the molding operation includes: S1: The modified asphalt mixture is coated on both sides of the tire base to form intermediate A; S2: A mineral granule layer is applied to one side of the surface of the intermediate A as an upper isolation layer, and A polyethylene film is applied to the other side surface of the intermediate A as a lower isolation layer.

[0045] The present invention does not have any special requirements on the specific types or forming materials of the mineral granules and the lower isolation layer. For example, the mineral granules can be shale flakes, colored sand, or ceramsite; the lower isolation layer can be polyethylene film or polypropylene film.

[0046] As previously stated, a third aspect of the present invention provides a bitumen waterproof membrane prepared by the method described in the second aspect.

[0047] As previously stated, the fourth aspect of the present invention provides the application of the bitumen waterproof membrane described in the third aspect in the field of exposed waterproofing of building roofs.

[0048] The present invention will be described in detail below through examples. In the following examples, the reagents and raw materials involved are all commercially available products, and the reagents are all analytical grade products.

[0049] Base bitumen: Grade AH-70, purchased from China National Petroleum Corporation; SBS: Grade LG411, star-shaped SBS, number average molecular weight of 250,000, 31 wt% of structural units provided by styrene, 69 wt% of structural units provided by butadiene, Shore A hardness of 84, purchased from LG Chem, South Korea. Heat stabilizer: Polyethylene wax, brand name NV-207P, purchased from Comino New Material Technology (Zhejiang) Co., Ltd., with a melt viscosity of 1000 cP at 140℃; Softener: Aromatic oil, brand name AL-09, purchased from Guangzhou Dagang Petroleum Technology Co., Ltd. Nucleating agent: The nano-montmorillonite, grade 1.44P, was purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., and its sheet length is 100nm and width is 30nm. Kaolin, grade LJ-90A, was purchased from Shanghai Liangjiang Chemical. Carbonate: Sodium bicarbonate, purchased from Weifang Chengyang Chemical Co., Ltd.; pH adjuster: citric acid, purchased from Aladdin Reagent Company; Dispersant: Sorbitan monooleate, purchased from Sigma-Aldrich; Filler: Talc powder, with an average particle diameter of 15μm, purchased from Liaoning Haicheng Talc Powder Company; Polyethylene film: purchased from Shanghai Youpus Materials Technology Co., Ltd.; Mineral granules: Shale flakes, purchased from Jiangsu Owens Colored Sand Technology Co., Ltd.

[0050] Example 1 (1) The base asphalt, SBS and softener are mixed in a reactor vessel until completely dissolved (the mass of the base asphalt is 470g) to obtain mixture I; (2) Mix the heat stabilizer, nucleating agent, and dispersant with the mixture I for the second time until the heat stabilizer is completely dissolved and the nucleating agent is evenly dispersed without agglomeration, to obtain mixture II; (3) Add the filler into the mixture II in three separate batches (each batch with equal mass) for a third mixing to obtain mixture III; (4) The carbonate, pH adjuster and the mixture III are mixed for the fourth time to obtain the modified asphalt mixture; (5) The modified asphalt mixture is molded, specifically, the steps are as follows: S1: The modified asphalt mixture is coated onto both sides of the tire base by extrusion to form intermediate A; S2: The upper and lower surfaces of the intermediate A are respectively covered with polyethylene film and mineral granules as isolation materials to obtain the asphalt waterproof membrane.

[0051] The remaining specific process parameters of this embodiment are shown in Table 1.

[0052] Examples 2-5 Examples 2-5 all adopted the same process as Example 1, and the differences are listed in Table 1.

[0053] Comparative Example 1 - Comparative Example 2 Comparative Examples 1 and 2 were carried out using the same process as in Example 1, with the differences listed in Table 1.

[0054] Table 1

[0055] Test case The physical performance test data of the examples and comparative examples are shown in Tables 2 and 3.

[0056] The softening point was determined in accordance with GB / T4507-2014 "Determination of Softening Point of Asphalt - Ring and Ball Method".

[0057] Low-temperature flexibility was determined in accordance with GB / T328.14-2007 "Test Methods for Building Waterproofing Membranes Part 14: Low-Temperature Flexibility of Bituminous Waterproofing Membranes".

[0058] Maximum peak tensile strength and maximum peak elongation were determined in accordance with GB / T328.8-2007 "Test Methods for Waterproofing Membranes - Part 8: Tensile Properties of Bituminous Waterproofing Membranes".

[0059] The joint peel strength was determined in accordance with GB / T328.20-2007 "Test Methods for Waterproofing Membranes - Part 20: Peel Performance of Joints in Asphalt Waterproofing Membranes".

[0060] The low-temperature flexibility under heat aging, the retention rate of tensile strength under heat aging, the retention rate of elongation under heat aging, and the impermeability were measured in accordance with GB18242-2008 "Elastomer Modified Bituminous Waterproof Membrane".

[0061] The density was determined according to the impregnation method in GB / T1033.1-2008 "Determination of density of plastics and non-foamed plastics - Part 1: Impregnation method, liquid specific gravity bottle method and titration method".

[0062] The thickness was determined in accordance with GB / T328.4-2007 "Test Methods for Waterproofing Membranes - Part 4: Thickness and Mass per Unit Area of ​​Bituminous Waterproofing Membranes".

[0063] Referring to GB / T16594-2008 "General Rules for Scanning Electron Microscopy Measurement of Micrometer-Scale Lengths", scanning electron microscopy was used to observe the cross-sectional microbubbles and their distribution. Based on the observation results, the state and distribution of microbubbles were qualitatively described. Specifically, "intact and uniform microbubbles" means that the microbubble structure is intact, uniformly distributed, and without obvious defects; "intact but unevenly distributed microbubbles" means that the microbubble structure is intact, but the distribution is locally dense or sparse; "partially damaged microbubbles" means that some microbubble structures have ruptured or collapsed; "mostly damaged microbubbles" means that more than half of the microbubble structures have ruptured or collapsed; and "no microbubbles" means that no obvious microbubble structure was observed in the cross-section.

[0064] Table 2

[0065] Table 3

[0066] SEM images of the microbubble structure of the asphalt waterproof membranes prepared in Embodiments 1, 4, Comparative Example 1, and Comparative Example 2 of the present invention are shown below. Figure 1 As shown. In Figure 1 In the figures, (a) is an SEM image of the microbubble structure of the cross-section of the asphalt waterproof membrane prepared in Example 1 after 60 days of placement. The microbubble structure is complete, uniformly distributed, and without obvious defects. (b) is an SEM image of the microbubble structure of the cross-section of the asphalt waterproof membrane prepared in Example 4 after 60 days of placement. The microbubble structure is complete, but the distribution is locally dense or sparse. (c) is an SEM image of the microbubble structure of the cross-section of the asphalt waterproof membrane prepared in Comparative Example 2 after 60 days of placement. More than half of the microbubble structures have ruptured or collapsed. (d) is an SEM image of the microbubble structure of the cross-section of the asphalt waterproof membrane prepared in Comparative Example 1 on the day of completion of preparation. No obvious microbubble structure is observed in the cross-section.

[0067] The results above show that the asphalt waterproof membrane provided by this invention has a low density, high bubble stability and uniformity, and its mechanical properties meet the national standard 18242-2008 "Elastomer Modified Asphalt Waterproof Membrane". It can save costs in production, transportation and application, while adapting to special scenarios such as roofs, bridges and underground projects.

[0068] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for use in asphalt waterproofing membranes, characterized in that, The composition contains a main agent and an auxiliary agent; the main agent contains base bitumen, SBS, heat stabilizer, softener, nucleating agent and carbonate; Based on 100 parts by weight of the total composition, the content of the base bitumen is 45-50 parts by weight, the content of SBS is 9.5-15 parts by weight, the content of the heat stabilizer is 1-2 parts by weight, the content of the softener is 9-12 parts by weight, the content of the nucleating agent is 1-3 parts by weight, and the content of the carbonate is 0.5-2 parts by weight. The SBS is a styrene-butadiene-styrene block copolymer with a number average molecular weight of 250,000-400,000. The content of structural units provided by styrene is 30-35 wt%, the content of structural units provided by butadiene is 65-70 wt%, and the Shore A hardness is 60-95 degrees.

2. The composition according to claim 1, characterized in that, The heat stabilizer has a melt viscosity of 800-1500 cP at 140°C; Preferably, the heat stabilizer is polypropylene wax and / or polyethylene wax.

3. The composition according to claim 1, characterized in that, The additives contain pH adjusters, dispersants, and fillers; Based on a total weight of 100 parts by weight of the composition, the content of the pH adjuster is 0.5-2 parts by weight, the content of the dispersant is 0.5-2 parts by weight, and the content of the filler is 25-35 parts by weight.

4. The composition according to any one of claims 1-3, characterized in that, The base bitumen is selected from at least one of AH-70, AH-90, and AH-100; And / or, the softener is at least one of naphthenic oil, base oil, and aromatic oil; And / or, the nucleating agent is nano-montmorillonite, wherein the length of the nano-montmorillonite sheets is 50-200 nm and the width is 10-50 nm; And / or, the carbonate is sodium bicarbonate.

5. The composition according to claim 3, characterized in that, The pH adjuster is an organic acid, and the organic acid is selected from at least one of citric acid, phosphate, and borate. And / or, the dispersant is sorbitan monooleate; And / or, the filler is selected from at least one of talc and heavy calcium carbonate.

6. A method for preparing asphalt waterproof membrane, characterized in that, This method is performed using any of the components in the composition according to any one of claims 1-5, comprising: (1) The base asphalt, SBS and softener are mixed for the first time to obtain mixture I; (2) Mix the mixture I with the heat stabilizer, nucleating agent and dispersant in the additives to obtain mixture II; (3) Mix the mixture II with the filler in the additives for a third time to obtain mixture III; (4) Mix the mixture III with carbonate and pH adjuster in the additives for the fourth time to obtain modified asphalt mixture; (5) The modified asphalt mixture is molded to obtain the asphalt waterproof membrane.

7. The method according to claim 6, characterized in that, In step (1), the conditions for the first mixing include: a stirring speed of 700-800 rpm, a temperature of 170-180℃, and a stirring time of 1-5 h; And / or, in step (2), the conditions for the second mixing include: a stirring speed of 800-1000 rpm, a temperature of 170-180°C, and a stirring time of 0.5-3 h; And / or, in step (3), the conditions for the third mixing include: a stirring speed of 600-800 rpm and a stirring time of 0.5-2 h; And / or, in step (4), the conditions for the fourth mixing include: a stirring speed of 400-500 rpm, a temperature of 160-170°C, and a stirring time of 0.5-2 h.

8. The method according to claim 6 or 7, characterized in that, In step (5), the molding operation includes: S1: The modified asphalt mixture is coated on both sides of the tire base to form intermediate A; S2: A mineral granule layer is applied to one side of the surface of the intermediate A as an upper isolation layer, and A polyethylene film is applied to the other side surface of the intermediate A as a lower isolation layer.

9. The bituminous waterproof membrane prepared by the method according to any one of claims 6-8.

10. The application of the bitumen waterproof membrane according to claim 9 in the field of exposed waterproofing of building roofs.

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