Glass fiber reinforced polyester-based modified bitumen waterproof membrane and its preparation method

Abstract

This application provides a glass fiber reinforced polyester-based modified bitumen waterproof membrane and its preparation method, belonging to the technical field of waterproof membranes. The glass fiber reinforced polyester-based modified bitumen waterproof membrane includes, from bottom to top, an upper isolation layer, an upper modified bitumen layer, a pre-impregnated glass fiber reinforced polyester base layer, a lower modified bitumen layer, and a lower isolation layer; wherein, the pre-impregnated glass fiber reinforced polyester base layer comprises a glass fiber reinforced polyester base, which is composed of a glass fiber mesh and a long-fiber polyester base; the intersection points of the longitudinal and transverse glass fiber lines in the glass fiber mesh are fixed by weaving.

Description

Technical Field

[0001] This application belongs to the field of waterproof membrane technology, specifically relating to a glass fiber reinforced polyester-based modified bitumen waterproof membrane and its preparation method. Background Technology

[0002] Long-fiber polyester-based modified bitumen waterproof membrane is a highly recommended waterproofing product, holding a significant market share since its introduction. Its open-flame hot-melt application method is also considered a reliable construction method in current engineering applications. However, this waterproof membrane has a significant technical defect: when a tear occurs on the surface, it is extremely prone to tearing, and the tear quickly spreads throughout the entire membrane, affecting its overall waterproofing function and increasing subsequent maintenance costs.

[0003] Analysis revealed that the core reasons for the aforementioned defects are mainly twofold: First, there are many types of existing modified asphalt with significant differences in acidity and alkalinity, and the acidic or alkaline substances contained therein can cause long-term hydrolysis and corrosion of the long-fiber polyester base; second, the processing temperature of existing modified asphalt is relatively high, and this high-temperature environment can cause irreversible damage to the adhesive of the polyester base. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a glass fiber reinforced polyester-based modified bitumen waterproof membrane and its preparation method, aiming to at least partially solve the above-mentioned technical problems. The specific technical solution provided by this application is as follows.

[0005] As a first aspect of this application, a glass fiber reinforced polyester-based modified bitumen waterproof membrane is provided, comprising, from bottom to top, an upper isolation layer, an upper modified bitumen layer, a pre-impregnated glass fiber reinforced polyester base layer, a lower modified bitumen layer, and a lower isolation layer. The pre-impregnated glass fiber reinforced polyester base layer comprises a glass fiber reinforced polyester base, which is composed of a glass fiber mesh and a long-fiber polyester base; the intersections of the longitudinal and transverse glass fiber lines in the glass fiber mesh are fixed by weaving.

[0006] As a second aspect of this application, a method for preparing a glass fiber reinforced polyester-based modified bitumen waterproof membrane is provided, comprising: coating modified bitumen on the upper and lower surfaces of a pre-impregnated glass fiber reinforced polyester base layer to obtain an upper modified bitumen layer and a lower modified bitumen layer, wherein the pre-impregnated glass fiber reinforced polyester base layer is composed of a composite of glass fiber mesh and long-fiber polyester base impregnated with modified bitumen; and covering the upper modified bitumen layer and the lower modified bitumen layer with a release material respectively away from the surface of the pre-impregnated glass fiber reinforced polyester base layer to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0007] In this application embodiment, a glass fiber reinforced polyester-based modified bitumen waterproof membrane (hereinafter referred to as waterproof membrane) is provided. The glass fiber reinforced polyester base is formed by combining a glass fiber mesh with a long-fiber polyester base. The glass fiber mesh is fixed by weaving, which effectively improves the tear strength and structural stability of the glass fiber reinforced polyester base, preventing the spread of tears after they appear in the waterproof membrane. At the same time, it eliminates the need to increase the thickness of the long-fiber polyester base, ensuring the designed thickness of the waterproof bitumen layer and balancing the oiliness and waterproof strength of the waterproof membrane during construction. Pre-impregnation treatment allows the modified bitumen to fully penetrate the interface of the glass fiber reinforced polyester base, enhancing the interlayer bonding force. Combined with a specific structure and preparation process, this significantly improves the "easily torn" defect of traditional waterproof membranes caused by bitumen corrosion and high-temperature damage, extending the service life of the waterproof membrane and reducing maintenance costs. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the mesh shape of the fiberglass mesh fabric in the embodiments of this application. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0010] In realizing the concept of this application, it was discovered that the hydrolytic corrosion effect of the difference in the acidity and alkalinity of asphalt on the long-fiber polyester base and the irreversible damage effect of the high temperature of modified asphalt processing on the polyester base adhesive are both objective factors that cannot be avoided in the production process of modified asphalt waterproof membranes. Therefore, it is necessary to improve the strength of the base itself. At present, the conventional means in the industry to enhance the tear strength of the polyester base is to increase the thickness of the polyester base. However, due to the requirement of the total thickness of the waterproof membrane, the increase in the thickness of the polyester base will inevitably lead to a corresponding reduction in the thickness of the modified asphalt layer, which will ultimately affect the oiliness and waterproof strength of the waterproof membrane during construction.

[0011] Based on this, this application provides a glass fiber reinforced polyester-based modified bitumen waterproof membrane and its preparation method. Starting from long-fiber polyester base composite with other materials, a high-strength glass fiber mesh is introduced and mechanical properties are designed to prepare a glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0012] As a first aspect of this application, a glass fiber reinforced polyester-based modified bitumen waterproof membrane is provided, comprising, from bottom to top, an upper isolation layer, an upper modified bitumen layer, a pre-impregnated glass fiber reinforced polyester base layer, a lower modified bitumen layer, and a lower isolation layer. The pre-impregnated glass fiber reinforced polyester base layer comprises a glass fiber reinforced polyester base, which is composed of a glass fiber mesh and a long-fiber polyester base; the intersections of the longitudinal and transverse glass fiber lines in the glass fiber mesh are fixed by weaving.

[0013] In this embodiment, a fiberglass reinforced polyester base is formed by combining a woven and fixed fiberglass mesh with a long-fiber polyester base. This significantly improves the tear strength and structural stability of the waterproof membrane without increasing the thickness of the long-fiber polyester base, effectively suppressing the risk of tear propagation in the waterproof membrane. At the same time, it ensures the design thickness of the modified bitumen layer, avoids reducing the oiliness and waterproof strength during construction, solves the "easily torn" defect of traditional waterproof membranes caused by bitumen corrosion and high-temperature damage, and extends the waterproof service life of the waterproof membrane.

[0014] In some embodiments, the linear density of the longitudinal glass fiber lines in the fiberglass mesh is 100tex-300tex, for example, 100tex, 150tex, 200tex, 250tex, or 300tex; the linear density of the transverse glass fiber lines in the fiberglass mesh is 100tex-300tex, for example, 100tex, 150tex, 200tex, 250tex, or 300tex. The linear density of the longitudinal glass fiber lines and the linear density of the transverse glass fiber lines can be the same or different, and can be flexibly selected according to actual application requirements; this application does not limit this.

[0015] In this embodiment, by reasonably limiting the linear density of the glass fiber lines in the longitudinal and transverse directions of the glass fiber mesh, the glass fiber mesh can have both suitable rigidity and flexibility. When combined with the long-fiber polyester base, it can form a synergistic reinforcement effect, which can not only ensure the overall tensile and tear resistance of the glass fiber reinforced polyester base, but also avoid the problem of reduced flexibility of the glass fiber mesh and poor composite performance with the long-fiber polyester base due to excessively thick glass fiber lines. At the same time, it can also prevent the glass fiber lines from being too thin and failing to achieve the expected reinforcement effect, further improving the waterproof membrane's ability to resist the spread of cracks.

[0016] In some embodiments, such as Figure 1 As shown, the mesh shape of the fiberglass mesh is quadrilateral or triangular (e.g., Figure 1 As shown in d). Preferably, the quadrilateral is a square (e.g., ...). Figure 1 (as shown in a), rhombus (as shown in a) Figure 1 (as shown in b) Parallelogram (as shown in b) Figure 1 Any one of the following (as shown in c).

[0017] Specifically, the side length of the quadrilateral grid is 4mm-12mm. For example, the side lengths of two adjacent quadrilateral grids can be 4mm×4mm, 6mm×6mm, 8mm×8mm, 10mm×10mm, or 12mm×12mm. The side length of the triangular grid is 4mm-12mm. For example, the side lengths of each side of the triangular grid can be 4mm×4mm×4mm, 6mm×6mm×6mm, 8mm×8mm×8mm, 10mm×10mm×10mm, or 12mm×12mm×12mm.

[0018] In this embodiment, by selecting quadrilateral or triangular fiberglass mesh shapes and matching appropriate mesh sizes, the fiberglass mesh fabric possesses superior structural stability and stress uniformity. Different mesh shapes can adapt to different construction scenario requirements. The regular mesh design allows for a tighter bond between the fiberglass mesh fabric and the long-fiber polyester base, smoother stress transfer, significantly improving the tear resistance and deformation resistance of the fiberglass-reinforced polyester base, effectively inhibiting the spread of cracks in the waterproof membrane, and ensuring waterproofing performance.

[0019] In some embodiments, the areal density of the fiberglass mesh is 80 g / m². 2 -120g / m 2 For example, it can be 80g / m 2 90g / m 2 100g / m 2 110g / m 2 120g / m 2 .

[0020] In this embodiment, by reasonably limiting the areal density of the fiberglass mesh, a synergistic matching effect is achieved between it and the linear density and mesh size of the fiberglass threads. This ensures that the fiberglass mesh has sufficient mechanical support strength, effectively enhancing the tear resistance of the fiberglass-reinforced polyester base. It also avoids the fiberglass mesh from becoming too thick and stiff due to excessive areal density, which would affect its compatibility with the long-fiber polyester base. At the same time, it takes into account the overall flexibility and construction performance of the waterproof membrane, further optimizing the comprehensive performance of the waterproof membrane.

[0021] In some embodiments, the fiberglass mesh is located at any of the middle, upper, or lower surfaces of the long-fiber polyester base. Preferably, when the fiberglass mesh is located on the upper or lower surface of the long-fiber polyester base, the thickness of the fiberglass mesh is ≤0.5 mm.

[0022] In this embodiment, by flexibly placing the fiberglass mesh in the middle, upper surface, or lower surface of the long-fiber polyester base, different reinforcement requirements and application scenarios can be specifically adapted. Furthermore, by reasonably limiting the thickness of the fiberglass mesh, it is possible to avoid the fiberglass mesh being too thick and affecting the overall compatibility of the fiberglass-reinforced polyester base, while ensuring that it fully exerts its reinforcing effect without increasing the total thickness. This effectively improves the tear resistance of the fiberglass-reinforced polyester base, inhibits the spread of cracks in the waterproof membrane, and guarantees the construction and use effects of the waterproof membrane.

[0023] In some embodiments, the mechanical properties of the fiberglass mesh fabric meet the requirements of 1000N / 50mm≤tensile strength≤1300N / 50mm. For example, the tensile strength of the fiberglass mesh fabric can be 1000N / 50mm, 1100N / 50mm, 1200N / 50mm, or 1300N / 50mm.

[0024] In this embodiment, by limiting the tensile properties of the fiberglass mesh, it possesses excellent tensile load-bearing capacity. When combined with long-fiber polyester base, it forms a strong and tough fiberglass-reinforced polyester base, which can effectively resist the risk of tearing under external force and prevent the spread of tears after they appear in the waterproof membrane. At the same time, this tensile property has a synergistic effect with the linear density, areal density and other parameters of the fiberglass mesh, further ensuring the structural stability of the waterproof membrane and extending its waterproof service life in practical applications.

[0025] In some embodiments, the mechanical properties of the long-fiber polyester base material meet the following requirements: tensile strength ≥ 1100 N / 50 mm, elongation ≥ 30%. The tensile strength of the fiberglass mesh is at least 50 N / 50 mm less than that of the long-fiber polyester base material.

[0026] In this embodiment, by limiting the tensile strength and elongation of the long-fiber polyester base and controlling the tensile strength of the fiberglass mesh to be lower than that of the long-fiber polyester base, a gradient stress system is formed after the two are combined. Under stress, the long-fiber polyester base bears the main tensile force, while the fiberglass mesh plays a supporting role in reinforcement and stress dispersion, avoiding local stress concentration that could lead to tearing. Simultaneously, the high elongation of the long-fiber polyester base can match the rigidity of the fiberglass mesh, improving the toughness and deformation resistance of the fiberglass-reinforced polyester base, effectively inhibiting crack propagation and ensuring the waterproof durability of the waterproof membrane.

[0027] In some embodiments, the upper isolation layer uses any one of polyethylene film, mineral particles, and fine sand as the isolation material. The lower isolation layer uses any one of polyethylene film and polypropylene film as the isolation material. The softening point of the polyethylene film or polypropylene film is 100℃-130℃, for example, 100℃, 110℃, 120℃, or 130℃. The particle size of the mineral particles is 400μm-1500μm, for example, 400μm, 800μm, 1000μm, 1200μm, or 1500μm. The particle size of the fine sand is ≤700μm, for example, 700μm, 500μm, or 300μm.

[0028] In some embodiments, the thickness of the upper modified bitumen layer is ≥0.8 mm and the thickness of the lower modified bitumen layer is ≥1.0 mm. The modified bitumen used in the glass fiber reinforced polyester-based modified bitumen waterproof membrane of this application can be a general formulation, and its preparation method can also adopt a general production process; this application does not limit this.

[0029] In summary, this application provides a glass fiber reinforced polyester-based modified bitumen waterproof membrane. By incorporating high-strength glass fiber mesh with low high-temperature influence and high deformation temperature into the polyester base, and utilizing the high yield strength of the glass fiber mesh, it can prevent the propagation of cracks in the glass fiber reinforced polyester base during tearing, achieving the "tear-resistant" characteristic of the waterproof membrane. It also ensures that the waterproof membrane has low stress absorption and release under high-temperature conditions, with a longitudinal and transverse dimensional change rate ≤0.5%. Furthermore, through targeted design of the mechanical properties of the glass fiber mesh, its maximum tensile strength is higher than the tensile strength at which the waterproof membrane tears but lower than the maximum tensile strength of the long-fiber polyester base. Ultimately, the longitudinal and transverse elongation rates of the glass fiber reinforced polyester-based waterproof membrane are ≥30%, meeting national standards.

[0030] As a second aspect of this application, a method for preparing a glass fiber reinforced polyester-based modified bitumen waterproof membrane is provided, comprising: coating modified bitumen on the upper and lower surfaces of a pre-impregnated glass fiber reinforced polyester base layer to obtain an upper modified bitumen layer and a lower modified bitumen layer, wherein the pre-impregnated glass fiber reinforced polyester base layer is composed of a composite of glass fiber mesh and long-fiber polyester base impregnated with modified bitumen; and covering the upper modified bitumen layer and the lower modified bitumen layer with a release material respectively away from the surface of the pre-impregnated glass fiber reinforced polyester base layer to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0031] In this embodiment, the fiberglass mesh is first composited with a long-fiber polyester base and then impregnated with modified bitumen. This allows the modified bitumen to fully penetrate the interfacial voids of the fiberglass-reinforced polyester base, significantly improving the interlayer bonding strength and preventing the fiberglass-reinforced polyester base from peeling off from the modified bitumen layer. The subsequent double-sided coating with modified bitumen and the covering with a release material ensure the uniformity of the waterproof membrane structure and ease of construction. The resulting waterproof membrane has both tear resistance and deformation resistance, effectively solving the technical defects of traditional waterproof membranes that are easy to tear and have cracks that spread.

[0032] The present application is further illustrated below through embodiments and related test experiments. In the detailed description below, numerous specific details are set forth for ease of explanation to provide a comprehensive understanding of the embodiments of the present application. However, it is apparent that one or more embodiments may be implemented without these specific details. Moreover, the details in the following embodiments can be arbitrarily combined to form other feasible embodiments without conflict. All instruments, consumables, and reagents used in the following embodiments are commercially available unless otherwise specified.

[0033] Comparative Example 1

[0034] Comparative Example 1 utilizes 250g / m 2 Polyester-based modified bitumen waterproof membrane was prepared using long-fiber polyester base.

[0035] The specific indicators of the long-fiber polyester base are shown in Table 1.

[0036] Table 1. Specific indicators of long-fiber polyester base material in Comparative Example 1

[0037]

[0038] The preparation method of the polyester-based modified bitumen waterproof membrane in Comparative Example 1 is as follows: the above-mentioned long-fiber polyester base is impregnated with modified bitumen to obtain a pre-impregnated polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE films are respectively covered on the upper modified bitumen layer and the lower modified bitumen layer away from the surface of the pre-impregnated polyester base to obtain the polyester-based modified bitumen waterproof membrane.

[0039] The mechanical properties of the above-mentioned polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 2.

[0040] Table 2 Test results of mechanical properties of waterproof membrane in Comparative Example 1

[0041]

[0042] As can be seen from Table 2, Comparative Example 1 is a general modified bitumen waterproof membrane formulation system with a tear strength of only 50N for trousers, which can be easily torn when there is a cut.

[0043] Comparative Example 2

[0044] Comparative Example 2 involves adding glass fibers longitudinally to a long-fiber polyester base to obtain a glass fiber reinforced polyester base, which is then further prepared into a glass fiber reinforced polyester base modified bitumen waterproof membrane.

[0045] The longitudinal unidirectional glass fiber has a linear density of 200 tex, and the spacing between two glass fibers is 8 mm. Specific parameters of the glass fiber reinforced polyester base are shown in Table 3.

[0046] Table 3 Specific indicators of glass fiber reinforced polyester base in Comparative Example 2

[0047]

[0048] The preparation method of the glass fiber reinforced polyester-based modified bitumen waterproof membrane in Comparative Example 2 is as follows: glass fibers are longitudinally distributed on the surface of long-fiber polyester base to obtain glass fiber reinforced polyester base; the glass fiber reinforced polyester base is impregnated with modified bitumen to obtain pre-impregnated glass fiber reinforced polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated glass fiber reinforced polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE films are respectively covered on the upper modified bitumen layer and the lower modified bitumen layer away from the surface of the pre-impregnated glass fiber reinforced polyester base to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0049] The mechanical properties of the above-mentioned glass fiber reinforced polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 4.

[0050] Table 4 Test results of mechanical properties of waterproof membrane in Comparative Example 2

[0051]

[0052] As shown in Table 4, Comparative Example 2, with its longitudinal glass fiber reinforced polyester base, showed no significant changes in tensile strength and elongation compared to Comparative Example 1. Due to the addition of glass fiber longitudinally, dimensional stability improved, resulting in a longitudinal dimensional change rate of 0.3%, a decrease of 0.3% compared to Comparative Example 1. The transverse tear strength of the trousers was 56N, an increase of 10N. Since there was no glass fiber composite in the transverse direction, neither the tear strength nor the dimensional change rate changed. The artificially "tear-prone" result did not meet the expected requirements.

[0053] Comparative Example 3

[0054] Comparative Example 3 utilizes longitudinal and transverse non-woven fiberglass mesh fabrics to composite with long-fiber polyester base to obtain fiberglass reinforced polyester base, and further prepares fiberglass polyester base modified bitumen waterproof membrane.

[0055] The fiberglass linear density of the non-woven fiberglass mesh fabric in both the longitudinal and transverse directions is 200 tex. The joints between the longitudinal and transverse fiberglass strands are fixed by overlapping or adhesive bonding. The mesh size is 8mm × 8mm, and the unit area mass is 90g / m². 2 The specific specifications of the glass fiber reinforced polyester base are shown in Table 5.

[0056] Table 5. Specific indicators of glass fiber reinforced polyester base in Comparative Example 3

[0057]

[0058] The preparation method of the glass fiber reinforced polyester-based modified bitumen waterproof membrane in Comparative Example 3 is as follows: a glass fiber mesh is laminated onto the surface of a long-fiber polyester base to obtain a glass fiber reinforced polyester base; the glass fiber reinforced polyester base is impregnated with modified bitumen to obtain a pre-impregnated glass fiber reinforced polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated glass fiber reinforced polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE films are respectively covered on the upper and lower modified bitumen layers away from the surface of the pre-impregnated glass fiber reinforced polyester base to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0059] The mechanical properties of the above-mentioned glass fiber reinforced polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 6.

[0060] Table 6 Test results of mechanical properties of waterproof membrane in Comparative Example 3

[0061]

[0062] As shown in Table 6, Comparative Example 3, a polyester base reinforced with glass fiber in both longitudinal and transverse directions, showed no significant changes in tensile strength and elongation compared to Comparative Example 1. Due to the increased glass fiber in both directions, dimensional stability was improved, resulting in a longitudinal dimensional change rate of 0.3%, a decrease of 0.3% compared to Comparative Example 1, and a transverse dimensional change rate of 0.1%, indicating reduced shrinkage. The transverse tear strength of the trousers was 57N, an increase of 11N, and the longitudinal tear strength was 60N, an increase of 10N. However, the lack of weaving at the fiber overlaps meant that there was no restraint on the tear, making it easily "torn" manually and failing to meet the expected requirements.

[0063] Comparative Example 4

[0064] Comparative Example 4 utilizes a composite of longitudinally and transversely woven fiberglass mesh and a long-fiber polyester base to obtain a fiberglass-reinforced polyester base, which is then further prepared to obtain a fiberglass-reinforced polyester base modified bitumen waterproof membrane.

[0065] The fiberglass linear density of the non-woven fiberglass mesh fabric in both the longitudinal and transverse directions is 100 tex, the overlapping joints of the longitudinal and transverse fiberglass lines are fixed by weaving, the mesh size is 8mm × 8mm, and the unit area mass is 70g / m². 2The specific specifications of the glass fiber reinforced polyester base are shown in Table 7.

[0066] Table 7 Specific Indicators of Glass Fiber Reinforced Polyester Base in Comparative Example 4

[0067]

[0068] The preparation method of the glass fiber reinforced polyester-based modified bitumen waterproof membrane in Comparative Example 4 is as follows: a glass fiber mesh is laminated onto the surface of a long-fiber polyester base to obtain a glass fiber reinforced polyester base; the glass fiber reinforced polyester base is impregnated with modified bitumen to obtain a pre-impregnated glass fiber reinforced polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated glass fiber reinforced polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE films are respectively covered on the upper and lower modified bitumen layers away from the surface of the pre-impregnated glass fiber reinforced polyester base to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0069] The mechanical properties of the above-mentioned glass fiber reinforced polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 8.

[0070] Table 8 Test results of mechanical properties of waterproof membrane in Comparative Example 4

[0071]

[0072] As shown in Table 6, Comparative Example 4, with its longitudinal and transverse glass fiber reinforced polyester base, exhibits improved tensile strength and elongation compared to Comparative Example 1. Due to the increased glass fiber in both directions, dimensional stability is enhanced, resulting in a longitudinal dimensional change rate of 0.2%, a decrease of 0.4% compared to Comparative Example 1, and a transverse dimensional change rate of 0, indicating reduced shrinkage. The transverse tear strength of the trousers is 90N, an increase of 44N, while the longitudinal tear strength is 96N, an increase of 46N. The longitudinal and transverse fiber overlap is woven, which provides some restraint during tearing, but the mechanical properties are relatively low, and it can be torn manually, failing to meet the expected requirements.

[0073] Comparative Example 5

[0074] Comparative Example 5 utilizes a composite of longitudinally and transversely woven fiberglass mesh and a long-fiber polyester base to obtain a fiberglass-reinforced polyester base, and further prepares a fiberglass-reinforced polyester base modified bitumen waterproof membrane.

[0075] The fiberglass linear density of the non-woven fiberglass mesh fabric in both the longitudinal and transverse directions is 250 tex. The overlapping joints of the longitudinal and transverse fiberglass lines are fixed by weaving. The mesh size is 6mm × 6mm, and the unit area mass is 130g / m². 2 The specific specifications of the glass fiber reinforced polyester base are shown in Table 9.

[0076] Table 9. Specific Indicators of Glass Fiber Reinforced Polyester Base in Comparative Example 5

[0077]

[0078] The preparation method of the glass fiber reinforced polyester-based modified bitumen waterproof membrane in Comparative Example 5 is as follows: a glass fiber mesh is laminated onto the surface of a long-fiber polyester base to obtain a glass fiber reinforced polyester base; the glass fiber reinforced polyester base is impregnated with modified bitumen to obtain a pre-impregnated glass fiber reinforced polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated glass fiber reinforced polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE films are respectively covered on the upper and lower modified bitumen layers away from the surface of the pre-impregnated glass fiber reinforced polyester base to obtain the glass fiber reinforced polyester-based modified bitumen waterproof membrane.

[0079] The mechanical properties of the above-mentioned glass fiber reinforced polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 10.

[0080] Table 10 Test results of mechanical properties of waterproof membrane in Comparative Example 5

[0081]

[0082] As shown in Table 10, Comparative Example 5, with its longitudinal and transverse glass fiber reinforced polyester base, exhibits a tensile strength increase of over 20% compared to Comparative Example 1. Due to the increased glass fiber in both directions, dimensional stability is improved, resulting in a longitudinal dimensional change rate of 0.2%, a decrease of 0.4% compared to Comparative Example 1, and a transverse dimensional change rate of 0, reducing shrinkage. The transverse tear strength (like trousers) is 145N, an increase of 99N, while the longitudinal tear strength is 140N, an increase of 90N. The longitudinal and transverse fiber overlap is woven, which helps to restrain the crack during tearing, preventing complete rupture. However, the high mechanical properties lead to a reduction of over 90% in the elongation of the waterproof membrane, failing to meet the requirements of GB 18242.

[0083] Example 1

[0084] In this embodiment 1, a fiberglass reinforced polyester base is obtained by combining a longitudinally and transversely woven fiberglass mesh with a long-fiber polyester base, and then a fiberglass polyester base modified bitumen waterproof membrane is prepared.

[0085] The fiberglass linear density of the non-woven fiberglass mesh fabric in both the longitudinal and transverse directions is 200 tex. The overlapping joints of the longitudinal and transverse fiberglass lines are fixed by weaving. The mesh size is 8mm × 8mm, and the unit area mass is 90g / m². 2 The specific specifications of the glass fiber reinforced polyester base are shown in Table 11.

[0086] Table 11 Specific Indicators of Glass Fiber Reinforced Polyester Base in Example 1

[0087]

[0088] The preparation method of the glass fiber reinforced polyester base modified bitumen waterproof membrane in Example 1 is as follows: glass fiber mesh is laminated on the surface of long fiber polyester base to obtain glass fiber reinforced polyester base; modified bitumen is impregnated on the glass fiber reinforced polyester base to obtain pre-impregnated glass fiber reinforced polyester base; modified bitumen is coated on the upper and lower surfaces of the pre-impregnated glass fiber reinforced polyester base to obtain an upper modified bitumen layer and a lower modified bitumen layer; PE film is respectively covered on the upper modified bitumen layer and the lower modified bitumen layer away from the surface of the pre-impregnated glass fiber reinforced polyester base to obtain the glass fiber reinforced polyester base modified bitumen waterproof membrane.

[0089] The mechanical properties of the above-mentioned glass fiber reinforced polyester-based modified bitumen waterproof membrane were tested. The test results are shown in Table 12.

[0090] Table 12 Test Results of Mechanical Properties of Waterproof Membrane in Example 1

[0091]

[0092] As shown in Table 12, Example 1 is a longitudinally and transversely glass fiber reinforced polyester base. Its tensile strength and elongation values ​​are comparable to Comparative Example 1. Due to the addition of glass fibers in both the longitudinal and transverse directions, dimensional stability is improved. Therefore, the longitudinal dimensional change rate is 0.2%, which is 0.4% lower than that of Comparative Example 1, and the transverse dimensional change rate is 0, reducing shrinkage. The transverse tear strength of the trousers is 125N, an increase of 76N, and the longitudinal tear strength is 120N, an increase of 70N. The longitudinal and transverse fiber overlap is woven, which has a binding effect on the crack during tearing, preventing it from tearing completely, and the elongation meets the requirements of GB 18242.

[0093] In summary, the fiberglass-reinforced polyester-based modified bitumen waterproof membrane provided in this application reduces the dimensional change rate of the waterproof membrane by more than 50% and increases the tear resistance by more than 50% by reinforcing the long-fiber polyester base with fiberglass mesh, achieving the performance goal of making the polyester base difficult to tear after impregnation with modified bitumen. Simultaneously, through targeted mechanical property design, it overcomes the technical challenge of low elongation of glass fiber, which fails to meet national standards, achieving an elongation rate of ≥30% for the waterproof membrane. This effectively solves the problem of tearing and extending damage to the waterproof membrane when there are gaps, extending the service life of the waterproof membrane under harsh construction conditions, reducing maintenance costs, and avoiding negative product reviews caused by malicious damage to the waterproof membrane, thus possessing excellent economic and social benefits.

[0094] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A glass fiber reinforced polyester-based modified bitumen waterproof membrane, characterized in that, It includes, from bottom to top, an upper isolation layer, an upper modified bitumen layer, a pre-impregnated glass fiber reinforced polyester base layer, a lower modified bitumen layer, and a lower isolation layer; The prepreg fiberglass reinforced polyester base layer comprises a fiberglass reinforced polyester base, which is composed of fiberglass mesh and long-fiber polyester base. The fiberglass mesh fabric is fixed by weaving at the intersection of the longitudinal and transverse fiberglass lines.

2. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 1, characterized in that, The linear density of the longitudinal glass fiber thread is 100tex-300tex, and the linear density of the transverse glass fiber thread is 100tex-300tex.

3. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 1, characterized in that, The fiberglass mesh is square or triangular in shape. The quadrilateral can be any one of a square, rhombus, or parallelogram.

4. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 3, characterized in that, The side length of the quadrilateral grid is 4mm-12mm; The side length of the triangular mesh is 4mm-12mm.

5. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 1, characterized in that, The areal density of the fiberglass mesh is 80 g / m². 2 -120g / m 2 .

6. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 1, characterized in that, The fiberglass mesh is located at any of the middle, upper, or lower surfaces of the long-fiber polyester base.

7. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 6, characterized in that, When the fiberglass mesh is located on the upper or lower surface of the long-fiber polyester base, the thickness of the fiberglass mesh is ≤0.5mm.

8. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to any one of claims 1-7, characterized in that, The mechanical properties of the fiberglass mesh fabric meet the requirements of 1000N / 50mm ≤ tensile strength ≤ 1300N / 50mm.

9. The glass fiber reinforced polyester-based modified bitumen waterproof membrane according to claim 1, characterized in that, The upper isolation layer uses any one of the following isolation materials: polyethylene film, mineral particles, and fine sand; The lower isolation layer uses either polyethylene film or polypropylene film as the isolation material.

10. A method for preparing a glass fiber reinforced polyester-based modified bitumen waterproof membrane as described in any one of claims 1-9, characterized in that, include: Modified asphalt is coated on the upper and lower surfaces of a pre-impregnated glass fiber reinforced polyester base layer to obtain an upper modified asphalt layer and a lower modified asphalt layer, wherein the pre-impregnated glass fiber reinforced polyester base layer is made by impregnating modified asphalt with a composite of glass fiber mesh and long-fiber polyester base. An isolation material is applied to the upper modified bitumen layer and the lower modified bitumen layer, respectively, on the surfaces of the pre-impregnated fiberglass reinforced polyester base layer, to obtain a fiberglass reinforced polyester base modified bitumen waterproof membrane.

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