Improved asphalt waterproof coiled material and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and discloses an improved asphalt waterproof coiled material and a preparation method thereof. The improved asphalt waterproof coiled material comprises a first release film layer, a first modified asphalt layer, a tire base layer, a second modified asphalt layer and a second release film layer which are sequentially arranged from top to bottom, wherein the first modified asphalt layer and the second modified asphalt layer are respectively and independently composed of modified asphalt raw materials; the modified asphalt raw material is prepared from the following raw materials in parts by weight: 50 to 70 parts of composite modified asphalt, 35 to 50 parts of acrylate emulsion, 2 to 5 parts of modified polypropylene fiber, 11 to 18 parts of filler, 4 to 6 parts of thickening agent, 2 to 4 parts of asphalt softening oil and 1 to 3 parts of anti-aging agent. Different additives are compounded, meanwhile, the acrylate emulsion, the inorganic filler and the modified polypropylene fiber are added and interact with the composite modified asphalt, so that a uniform and stable net structure is formed, and the prepared modified asphalt layer is high in bonding capacity and toughness.

Description

Technical Field

[0001] The present application relates to the technical field of building materials, and in particular to an improved asphalt waterproofing membrane and a preparation method thereof. Background Art

[0002] Waterproof membranes are mainly used in building walls, roofs, tunnels, roads, landfills, etc. They are a kind of flexible building material product that can be rolled into a roll to resist the leakage of rainwater and groundwater from the outside. As a leak-free connection between the engineering foundation and the building, it is the first barrier to waterproofing the entire project and plays a vital role in the entire project. Asphalt waterproof membranes are a traditional and widely used waterproof membrane. They have been widely recognized worldwide for their cost-effectiveness and relatively simple construction process. However, with the continuous improvement of engineering standards and increasingly stringent environmental conditions, some disadvantages of asphalt waterproof membranes have gradually emerged in terms of bonding strength and toughness. These problems will directly affect the overall performance and durability of waterproof membranes. Summary of the invention

[0003] In order to solve the above technical problems and develop an asphalt waterproofing membrane with good bonding strength, toughness and excellent waterproofing performance, the present application provides an improved asphalt waterproofing membrane and a preparation method thereof.

[0004] In the first aspect, the present application provides an improved asphalt waterproofing membrane, which includes a first release film layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a second release film layer arranged in sequence from top to bottom, and the first modified asphalt layer and the second modified asphalt layer are each independently composed of modified asphalt raw materials; the modified asphalt raw materials include the following raw materials in parts by weight: 50-70 parts of composite modified asphalt, 35-50 parts of acrylic emulsion, 2-5 parts of modified polypropylene fiber, 11-18 parts of filler, 4-6 parts of thickener, 2-4 parts of asphalt softening oil, and 1-3 parts of antioxidant.

[0005] By adopting the above technical scheme, the present application improves the comprehensive performance of asphalt waterproofing coiled material, especially toughness, bonding strength and waterproof performance, through a multilayer structure and modified asphalt raw materials with specific components. Through the reasonable proportion of raw materials such as composite modified asphalt, modified polypropylene fiber, filler, thickener, etc., a dense waterproof layer can be formed to effectively prevent water penetration. Using composite modified asphalt as the matrix of modified asphalt raw material can improve the low-temperature brittleness and high-temperature fluidity of asphalt, so that it can maintain good elasticity and toughness in a wider temperature range; the addition of modified polypropylene fiber increases the tear resistance and tensile strength of the modified asphalt raw material, improves the toughness of the coiled material, and makes it less likely to break when subjected to external forces; acrylic emulsion has good bonding properties, which can enhance the bonding force between the asphalt layer and the tire base layer, and can also improve the bonding effect between the coiled material and the base layer.

[0006] Optionally, the method for preparing the composite modified asphalt comprises the following steps: A1. Heat the base asphalt at 150-160°C for 1-2h, then add SBS and polyurethane in sequence, and stir at 300-500rpm for 20-30min to obtain a mixture; A2. Subject the mixture obtained in step A1 to high-speed shearing at 150-160° C. for 45-55 minutes, add graphene oxide, and subject it to high-speed shearing at 150-160° C. for 30-40 minutes to obtain the composite modified asphalt.

[0007] By adopting the above technical solution, this application selects SBS, polyurethane and graphene oxide to carry out composite modification of the matrix asphalt, and heats the matrix asphalt to 150-160°C to reduce its viscosity, facilitate the subsequent addition of modifiers and ensure its uniform dispersion. SBS is an elastomer that can improve the elasticity and toughness of asphalt, especially at low temperatures; polyurethane can enhance the adhesion and wear resistance of asphalt; graphene oxide has an extremely high specific surface area and excellent mechanical properties, and its addition can form a network structure in the asphalt matrix, significantly improving the strength and toughness of asphalt.

[0008] Optionally, the rotation speed of the high-speed shearing treatment is 160-180 rpm.

[0009] Optionally, the weight ratio of the matrix asphalt, SBS, polyurethane and graphene oxide is 100:10-15:15-20:1-5.

[0010] Optionally, the SBS includes a star-shaped structure SBS and a linear structure SBS in a weight ratio of 1:(3-5).

[0011] By adopting the above technical solution, linear SBS usually has better low-temperature performance because it can maintain high elasticity at low temperatures. Star-shaped SBS may perform better in high-temperature stability because its molecular structure helps to form a more stable network structure and improve the high-temperature performance of asphalt. This application uses a star-shaped and linear SBS compound to modify asphalt, which can further improve the performance of asphalt, thereby improving the performance of asphalt waterproofing membranes.

[0012] Optionally, the preparation method of the modified polypropylene fiber comprises the following steps: soaking the polypropylene fiber in a 4% by mass NaOH solution for 4-5 hours, taking it out, washing the surface with distilled water, then soaking it in a styrene-acrylic emulsion for 30-40 minutes with stirring, taking it out and drying it for later use, so as to obtain the modified polypropylene fiber.

[0013] By adopting the above technical solution, the alkaline solution can slightly erode the fiber surface, form a microporous structure, increase the surface roughness and active sites of the fiber, and thus improve the bonding performance between the fiber and the asphalt matrix; the polymer in the styrene acrylic emulsion can further wrap the fiber surface, enhance the interfacial bonding between the fiber and the asphalt matrix, and improve the dispersion and stability of the fiber in the asphalt. The addition of modified polypropylene fiber can significantly improve the toughness of the asphalt waterproofing membrane, making it less likely to break when subjected to large deformation, and enhancing the durability and adaptability of the membrane.

[0014] Optionally, the length of the modified polypropylene fiber is 5-15 mm.

[0015] Optionally, the filler comprises talc powder and heavy calcium carbonate in a weight ratio of 1:4-8.

[0016] By adopting the above technical solution, this application selects talcum powder and heavy calcium carbonate as inorganic fillers. The addition of heavy calcium carbonate can improve the tensile strength and tear strength of the coiled material, making it tougher when subjected to external forces; the layered structure of talcum powder can form tiny interlayer slip in the asphalt matrix, improve the toughness of the coiled material, and reduce brittle fracture. The appropriate filler ratio helps to improve the dispersion of the filler in the asphalt matrix and ensure the uniformity of the coiled material performance.

[0017] Optionally, the tread base layer is polyester felt, and the thickness of the tread base layer is 0.8-1.2 mm.

[0018] Optionally, the thickness of the first modified asphalt layer and the second modified asphalt layer are both 3-6 mm.

[0019] In a second aspect, the present application provides a method for preparing the above-mentioned improved asphalt waterproofing membrane, comprising the following steps: S1, melt-blending composite modified asphalt, acrylic emulsion, modified polypropylene fiber, filler, thickener, asphalt softening oil and antioxidant to obtain modified asphalt raw material; S2, laying the modified asphalt raw material on the front and back sides of the tire base respectively, to obtain a first modified asphalt layer and a second modified asphalt layer respectively arranged on both sides of the tire base; S3, laying a first release film layer on the first modified asphalt layer, laying a second release film layer on the second modified asphalt layer, cooling, and rolling up to obtain an improved asphalt waterproofing membrane.

[0020] By adopting the above technical scheme, the preparation method adopted in the present application has a simple process, is easy to operate, improves production efficiency, and is suitable for industrial production.

[0021] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application improves the comprehensive performance of asphalt waterproofing membrane, especially toughness, bonding strength and waterproof performance, through a multi-layer structure and modified asphalt raw materials with specific ingredients. Through the reasonable proportion of composite modified asphalt, modified polypropylene fiber, filler, thickener and other raw materials, a dense waterproof layer can be formed to effectively prevent water penetration. Using composite modified asphalt as the matrix of modified asphalt raw material can improve the low-temperature brittleness and high-temperature fluidity of asphalt, so that it can maintain good elasticity and toughness in a wider temperature range; the addition of modified polypropylene fiber increases the tear resistance and tensile strength of the modified asphalt raw material, improves the toughness of the membrane, and makes it less likely to break when subjected to external forces; acrylic emulsion has good bonding properties, which can enhance the bonding force between the asphalt layer and the base layer, and also improve the bonding effect between the membrane and the base layer.

[0022] 1. The preparation method adopted in this application has a simple process, is easy to operate, improves production efficiency, and is suitable for industrial production. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to the embodiments.

[0024] The present application designs an improved asphalt waterproofing membrane, which includes a first release film layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a second release film layer, which are arranged in sequence from top to bottom, and the first modified asphalt layer and the second modified asphalt layer are each independently composed of modified asphalt raw materials; The modified asphalt raw material comprises the following raw materials in parts by weight: 50-70 parts of composite modified asphalt, 35-50 parts of acrylic emulsion, 2-5 parts of modified polypropylene fiber, 11-18 parts of filler, 4-6 parts of thickener, 2-4 parts of asphalt softening oil and 1-3 parts of antioxidant.

[0025] The improved asphalt waterproofing membrane of the present application is prepared by the following method, comprising the following steps: S1, melt-blending composite modified asphalt, acrylic emulsion, modified polypropylene fiber, filler, thickener, asphalt softening oil and antioxidant to obtain modified asphalt raw material; S2, laying the modified asphalt raw material on the front and back sides of the tire base respectively, to obtain a first modified asphalt layer and a second modified asphalt layer respectively arranged on both sides of the tire base; S3, laying a first release film layer on the first modified asphalt layer, laying a second release film layer on the second modified asphalt layer, cooling, and rolling up to obtain an improved asphalt waterproofing membrane.

[0026] This application improves the comprehensive performance of asphalt waterproofing membrane, especially toughness, bonding strength and waterproof performance, through a multi-layer structure and modified asphalt raw materials with specific components. Through the reasonable ratio of composite modified asphalt, modified polypropylene fiber, filler, thickener and other raw materials, a dense waterproof layer can be formed to effectively prevent water penetration. Using composite modified asphalt as the matrix of modified asphalt raw material can improve the low-temperature brittleness and high-temperature fluidity of asphalt, so that it can maintain good elasticity and toughness in a wider temperature range; the addition of modified polypropylene fiber increases the tear resistance and tensile strength of the modified asphalt raw material, improves the toughness of the membrane, and makes it less likely to break when subjected to external forces; acrylic emulsion has good bonding properties, which can enhance the bonding force between the asphalt layer and the tire base layer, and can also improve the bonding effect between the membrane and the base layer.

[0027] The preparation method adopted in the present application has a simple process, is easy to operate, improves production efficiency, and is suitable for industrial production.

[0028] Preparation Example 1 This preparation example provides a modified polypropylene fiber, and its preparation method includes the following steps: putting the polypropylene fiber into a 4% by mass NaOH solution and soaking it for 4.5 hours, then taking it out, washing the surface with distilled water, then putting it into a styrene-acrylic emulsion and stirring and soaking it for 35 minutes, taking it out and drying it for later use, to obtain the modified polypropylene fiber.

[0029] Wherein, the length of the modified polypropylene fiber is 10 mm.

[0030] Preparation Example 2-4 Preparation Example 2 This preparation example provides a composite modified asphalt, and the preparation method thereof comprises the following steps: A1. Heat the base asphalt at 155°C for 1.5h, then add SBS and polyurethane in sequence, and stir at 400rpm for 25min to obtain a mixture; A2. Subject the mixture obtained in step A1 to high-speed shearing at 155° C. for 50 minutes, add graphene oxide, and subject it to high-speed shearing at 155° C. for 35 minutes to obtain the composite modified asphalt.

[0031] The rotation speed of the high-speed shear treatment is 170 rpm, the weight ratio of matrix asphalt, SBS, polyurethane and graphene oxide is 100:12:18:3, and the SBS is a star-shaped structure SBS and a linear structure SBS with a weight ratio of 1:4.

[0032] The matrix asphalt is 90# petroleum asphalt, the star-shaped SBS is SBS 402, the linear-shaped SBS is SBS1401, the polyurethane is WHT-1495EC TPU from Wanhua Chemical, and graphene oxide is purchased from Beijing Bailingwei Technology Co., Ltd.

[0033] Preparation Example 3 The difference between this preparation example and preparation example 2 is that this preparation example provides a composite modified asphalt, and the preparation method thereof comprises the following steps: A1. Heat the base asphalt at 150°C for 2h, then add SBS and polyurethane in sequence, and stir at 300rpm for 30min to obtain a mixture; A2. The mixture obtained in step A1 is subjected to high-speed shearing treatment at 150° C. for 55 minutes, and then graphene oxide is added and high-speed shearing is carried out at 150° C. for 40 minutes to obtain the composite modified asphalt.

[0034] The rotation speed of the high-speed shear treatment is 180 rpm, the weight ratio of matrix asphalt, SBS, polyurethane and graphene oxide is 100:10:15:1, and the SBS is a star-shaped structure SBS and a linear structure SBS with a weight ratio of 1:3.

[0035] Preparation Example 4 The difference between this preparation example and preparation example 2 is that this preparation example provides a composite modified asphalt, and the preparation method thereof comprises the following steps: A1. Heat the base asphalt at 160°C for 1 hour, then add SBS and polyurethane in sequence, and stir at 500 rpm for 20 minutes to obtain a mixture; A2. Subject the mixture obtained in step A1 to high-speed shearing at 160° C. for 45 minutes, add graphene oxide, and subject it to high-speed shearing at 160° C. for 30 minutes to obtain the composite modified asphalt.

[0036] The rotation speed of the high-speed shear treatment is 160 rpm, the weight ratio of the matrix asphalt, SBS, polyurethane and graphene oxide is 100:15:20:5, and the SBS is a star-shaped structure SBS and a linear structure SBS with a weight ratio of 1:5.

[0037] Preparation Example 5-11 Preparation Example 5 This preparation example provides a modified asphalt raw material, including the following raw materials in parts by weight: 60 parts of composite modified asphalt, 45 parts of acrylic emulsion, 4 parts of modified polypropylene fiber, 15 parts of filler, 5 parts of thickener, 3 parts of asphalt softening oil, and 2 parts of antioxidant.

[0038] Among them, the composite modified asphalt is prepared by Preparation Example 2, the modified polypropylene fiber is prepared by Preparation Example 1, the filler is talcum powder and heavy calcium carbonate in a weight ratio of 1:6, the acrylic emulsion is purchased from Shanghai Baoliga Chemical Co., Ltd., the thickener is hydroxypropyl methylcellulose, the asphalt softening oil is cycloalkane oil, and the antioxidant is antioxidant AW.

[0039] Preparation Example 6 The difference between this preparation example and preparation example 5 is that the following raw materials are included in parts by weight: 50 parts of composite modified asphalt, 35 parts of acrylic emulsion, 2 parts of modified polypropylene fiber, 11 parts of filler, 4 parts of thickener, 2 parts of asphalt softening oil, and 1 part of antioxidant.

[0040] Preparation Example 7 The difference between this preparation example and preparation example 5 is that the following raw materials are included in parts by weight: 70 parts of composite modified asphalt, 50 parts of acrylic emulsion, 5 parts of modified polypropylene fiber, 18 parts of filler, 6 parts of thickener, 4 parts of asphalt softening oil, and 3 parts of antioxidant.

[0041] Preparation Example 8 The difference between this preparation example and preparation example 5 is that the composite modified asphalt is prepared by preparation example 3.

[0042] Preparation Example 9 The difference between this preparation example and preparation example 5 is that the composite modified asphalt is prepared by preparation example 4.

[0043] Preparation Example 10 The difference between this preparation example and preparation example 5 is that the filler is talcum powder and heavy calcium carbonate in a weight ratio of 1:4.

[0044] Preparation Example 11 The difference between this preparation example and preparation example 5 is that the filler is talcum powder and heavy calcium carbonate in a weight ratio of 1:8.

[0045] Examples 1-7 Examples 1-7 are improved asphalt waterproofing membranes made of a first modified asphalt layer and a second modified asphalt layer formed of different modified asphalt raw materials, the difference being the modified asphalt raw materials used. See Table 1 for the differences.

[0046] Table 1 The tread base layer in Example 1-8 is polyester felt, and the thickness of the tread base layer is 1 mm.

[0047] The thickness of the first modified asphalt layer and the second modified asphalt layer in Examples 1-8 are both 5 mm.

[0048] The preparation process of Examples 1-8 comprises the following steps: S1, melt-blending composite modified asphalt, acrylic emulsion, modified polypropylene fiber, filler, thickener, asphalt softening oil and antioxidant to obtain modified asphalt raw material; S2, laying the modified asphalt raw material on the front and back sides of the tire base respectively, to obtain a first modified asphalt layer and a second modified asphalt layer respectively arranged on both sides of the tire base; S3, laying a first release film layer on the first modified asphalt layer, laying a second release film layer on the second modified asphalt layer, cooling, and rolling up to obtain an improved asphalt waterproofing membrane.

[0049] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the composite modified asphalt in the modified asphalt raw material in Comparative Example 1 is replaced by 90# petroleum asphalt in an equal amount.

[0050] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the modified polypropylene fiber in Comparative Example 2 is replaced by an equal amount of unmodified polypropylene fiber.

[0051] Performance Testing 1. Toughness test: The yield elongation and yield strength of the improved asphalt waterproof membranes prepared in Examples 1-7 and Comparative Examples 1-2 were measured with reference to the standard GB / T528-2009.

[0052] 2. Waterproofness test: Referring to GB / T35467-2017 "Wet-laid waterproofing membrane", the improved asphalt waterproofing membranes prepared in Examples 1-7 and Comparative Examples 1-2 were first pre-aged to simulate a waterproofing membrane with a service life of 30 years. After that, the improved asphalt waterproofing membranes in Examples 1-7 and Comparative Examples 1-2 were placed in an environment with a water pressure of 0.3 MPa for 120 minutes to observe whether they were water permeable.

[0053] 3. Adhesion performance: The joint shearing performance and joint peeling performance of the improved asphalt waterproofing membrane 7 prepared in Examples 1-7 and Comparative Examples 1-2 were tested according to GB / T 328-2007 "Test methods for building waterproofing membranes".

[0054] The measurement results are shown in Table 2.

[0055] Table 2 By analyzing the data in Table 2, it can be obtained that the improved asphalt waterproofing coiled material provided by the present application has excellent tensile deformation performance, bonding strength and good waterproof performance. The comprehensive performance of the asphalt waterproofing coiled material, especially toughness, bonding strength and waterproof performance, is improved by the modified asphalt raw material of the multilayer structure and the specific composition. Through the reasonable proportion of raw materials such as composite modified asphalt, modified polypropylene fiber, filler, thickener, etc., a dense waterproof layer can be formed to effectively prevent water penetration. Using the composite modified asphalt as the matrix of the modified asphalt raw material can improve the low-temperature brittleness and high-temperature fluidity of the asphalt, so that it can maintain good elasticity and toughness in a wider temperature range; the addition of modified polypropylene fiber increases the tear resistance and tensile strength of the modified asphalt raw material, improves the toughness of the coiled material, and makes it difficult to break when subjected to external force; acrylic emulsion has good bonding performance, can enhance the bonding force between the asphalt layer and the tire base layer, and can also improve the bonding effect between the coiled material and the base layer.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An improved asphalt waterproofing membrane, comprising a first release film layer, a first modified asphalt layer, a base layer, a second modified asphalt layer and a second release film layer arranged in sequence from top to bottom, characterized in that: The first modified asphalt layer and the second modified asphalt layer are each independently composed of modified asphalt raw materials; The modified asphalt raw material comprises the following raw materials in parts by weight: 50-70 parts of composite modified asphalt, 35-50 parts of acrylic emulsion, 2-5 parts of modified polypropylene fiber, 11-18 parts of filler, 4-6 parts of thickener, 2-4 parts of asphalt softening oil and 1-3 parts of antioxidant.

2. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The preparation method of the composite modified asphalt comprises the following steps: A1. Heat the base asphalt at 150-160°C for 1-2h, then add SBS and polyurethane in sequence, and stir at 300-500rpm for 20-30min to obtain a mixture; A2. Subject the mixture obtained in step A1 to high-speed shearing at 150-160° C. for 45-55 minutes, add graphene oxide, and subject it to high-speed shearing at 150-160° C. for 30-40 minutes to obtain the composite modified asphalt.

3. The improved asphalt waterproofing membrane according to claim 2, characterized in that: The weight ratio of the matrix asphalt, SBS, polyurethane and graphene oxide is 100:10-15:15-20:1-5.

4. The improved asphalt waterproofing membrane according to claim 2, characterized in that: The SBS includes a star-shaped structure SBS and a linear structure SBS in a weight ratio of 1:(3-5).

5. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The preparation method of the modified polypropylene fiber comprises the following steps: soaking the polypropylene fiber in a 4% by mass NaOH solution for 4-5 hours, taking it out, washing the surface with distilled water, then soaking it in a styrene-acrylic emulsion for 30-40 minutes, taking it out and drying it for later use, so as to obtain the modified polypropylene fiber.

6. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The length of the modified polypropylene fiber is 5-15 mm.

7. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The filler comprises talc powder and heavy calcium carbonate in a weight ratio of 1:4-8.

8. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The tire base layer is polyester felt, and the thickness of the tire base layer is 0.8-1.2 mm.

9. The improved asphalt waterproofing membrane according to claim 1, characterized in that: The thickness of the first modified asphalt layer and the second modified asphalt layer are both 3-6 mm.

10. A method for preparing the improved asphalt waterproofing membrane according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, melt-blending composite modified asphalt, acrylic emulsion, modified polypropylene fiber, filler, thickener, asphalt softening oil and antioxidant to obtain modified asphalt raw material; S2, laying the modified asphalt raw material on the front and back sides of the tire base respectively, to obtain a first modified asphalt layer and a second modified asphalt layer respectively arranged on both sides of the tire base; S3, laying a first release film layer on the first modified asphalt layer, laying a second release film layer on the second modified asphalt layer, cooling, and rolling up to obtain an improved asphalt waterproofing membrane.

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