Exposed water-based asphalt-based waterproof coating material and preparation method therefor, and waterproof laminate

Abstract

The present invention relates to an exposed water-based asphalt-based waterproof coating material and a preparation method therefor, and a waterproof laminate. The exposed water-based asphalt-based waterproof coating material comprises anionic emulsified asphalt, a polymer emulsion, a filler, and an auxiliary agent, wherein the anionic emulsified asphalt is prepared by melt-blending matrix asphalt with a composite weather-resistant additive and then emulsifying the resulting blend. The composite weather-resistant additive is a combination of an antioxidant and an ultraviolet absorbent in a mass ratio of 0.5-2:1, and the polymer emulsion is one of or a combination of more than one of a weather-resistant styrene-acrylic emulsion, a weather-resistant pure acrylic emulsion, and a weather-resistant silicone acrylic emulsion. By introducing the antioxidant and the ultraviolet absorbent into the anionic emulsified asphalt, the present invention improves the stability of a waterproof coating material system and avoids a demulsification phenomenon; moreover, by using a weather-resistant polymer emulsion in combination with a filler and an auxiliary agent, the weather resistance of the prepared waterproof coating material is greatly improved; furthermore, by means of the protective effect and the sunlight reflecting effect of white sintered sand adhered to a surface of the coating material, the waterproof system can be used as an exposed product for waterproof construction of buildings that have been in exposed environments for a long time.

Description

An exposed water-based bitumen-based waterproof coating and its preparation method, and a waterproof laminate. Technical Field

[0001] This invention belongs to the field of building waterproofing materials technology, specifically relating to an exposed water-based asphalt-based waterproof coating and its preparation method, as well as a waterproof laminate. Background Technology

[0002] Single-component water-based asphalt waterproof coatings are increasingly favored by users due to their simple construction, stable performance, ease of use, and wide applicability. However, asphalt itself has poor weather resistance, resulting in generally poor weather resistance for conventional water-based asphalt waterproof coatings. Long-term exposure to the natural environment exposes them to rain, snow, wind, frost, ultraviolet radiation, and air pollutants, severely impacting the performance of the waterproof layer material and significantly shortening the service life of building waterproofing. Therefore, they can only be used indoors or in non-exposed environments, severely limiting their application scope.

[0003] Patent CN114989728A discloses an exposed water-based rubber asphalt waterproof coating and its preparation method. The waterproof coating comprises anionic emulsified asphalt, SBR rubber latex, emulsifier, heavy calcium carbonate, fumed silica, antioxidant, UV-resistant additive, defoamer, Kathon preservative, thickener, and water. This patent utilizes the synergistic effect of fumed silica and heavy calcium carbonate with specific surface areas, along with anionic emulsified asphalt, SBR rubber latex with appropriate solid content, and components such as antioxidants, UV-resistant additives, and Kathon preservative, to improve the mechanical properties and adhesive strength of the waterproof coating film, further enhancing its anti-slip properties, heat resistance, and aging resistance. However, the shortcomings of this patent are as follows: the raw material, anionic emulsified asphalt, is a commercially available conventional product. Only by adding additives such as fumed silica, antioxidants, and UV stabilizers to improve the weather resistance of the product, the improvement effect is not good. In addition, antioxidants and UV stabilizers are all organic additives, and their direct addition to the aqueous system may cause the product system to become less stable, or even cause demulsification. Summary of the Invention

[0004] The technical problem actually solved by this invention is that the weather resistance of existing exposed water-based asphalt waterproof coatings still needs to be improved, and that an exposed water-based asphalt waterproof coating with better weather resistance and its preparation method are provided.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An exposed water-based asphalt-based waterproof coating includes anionic emulsified asphalt, polymer emulsion, filler and additives. The anionic emulsified asphalt is obtained by emulsifying a base asphalt and a composite weather-resistant additive after melt blending. The composite weather-resistant additive is a combination of an antioxidant and an ultraviolet absorber in a mass ratio of 0.5 to 2:1.

[0007] The polymer emulsion is one or more of the following: weather-resistant styrene-acrylic emulsion, weather-resistant pure acrylic emulsion, and weather-resistant silicone-acrylic emulsion.

[0008] The mass ratio of the anionic emulsified asphalt, polymer emulsion, filler and additives is 20-50:20-50:5-25:0.1-5.

[0009] By adopting the above technical solution, this invention introduces antioxidants and ultraviolet absorbers into anionic emulsified asphalt, which not only improves the stability of the waterproof coating system and avoids demulsification, but also, combined with the use of weather-resistant polymer emulsions, fillers, and additives, greatly enhances the weather resistance of the prepared waterproof coating. During construction, the white sintered sand adhering to the coating surface further reflects and protects against sunlight, making it suitable as an exposed product for waterproofing buildings in long-term exposed environments.

[0010] In some specific embodiments, the polymer emulsion is selected from weather-resistant polymer emulsions such as those from BADEFU and POLIGAZ.

[0011] In some embodiments, the mass ratio of the base asphalt to the composite weather-resistant additive is 40-65:1-5.

[0012] Furthermore, the base asphalt is 70# petroleum asphalt produced by Jingbo Petrochemical's atmospheric and vacuum distillation.

[0013] In some embodiments, the method for preparing the anionic emulsified asphalt includes the following steps:

[0014] (1) The base asphalt and the composite weather-resistant additive are melt-mixed at 120-140°C to obtain a rubber compound;

[0015] (2) Dissolve the anionic emulsifier in water to obtain soap solution;

[0016] (3) The rubber compound and soap solution are ground at 60-90°C to obtain the anionic emulsified asphalt.

[0017] Furthermore, in step (1), the mixture is melt-mixed at 125–135°C.

[0018] Furthermore, the anionic emulsifier is a slow-cracking, slow-coagulation composite anionic emulsifier.

[0019] Further, in step (2), the temperature of the soap solution is controlled at 40-70°C and the dissolution time is 1-4 hours; even further, the temperature of the soap solution is controlled at 50-60°C and the dissolution time is 2-3 hours.

[0020] Furthermore, in step (3), the grinding temperature is 65-85℃, or 70-80℃, or 75℃.

[0021] Furthermore, the mass ratio of the base asphalt, composite weather-resistant additive, anionic emulsifier, and water is 40-65:1-5:1-5:30-60.

[0022] In some embodiments, the antioxidant is one or more of antioxidant 1076, antioxidant 1010, antioxidant 168 and antioxidant 1098; the ultraviolet absorber is selected from one or more of UV-326, UV-328, UV-329, UV-928 and UV-400.

[0023] In some embodiments, the filler is a hydrophobic filler selected from one or more combinations of hydrophobic modified nano-calcium carbonate, hydrophobic modified nano-talc, and hydrophobic modified nano-silica.

[0024] In some embodiments, the solid content of the anionic emulsified bitumen is 50-60%, the solid content of the polymer emulsion is 45-55%, the exposed water-based bitumen-based waterproof coating further contains water, and the mass ratio of the anionic emulsified bitumen, polymer emulsion, hydrophobic filler, additives and water is 20-50:20-50:5-25:0.1-5:5-40.

[0025] Furthermore, the amount of solids in the polymer emulsion is greater than the amount of solids in the anionic emulsified asphalt.

[0026] In some embodiments, the additives include one or a combination of thickeners, defoamers, and bactericides and preservatives.

[0027] Furthermore, the mass ratio of the thickener, defoamer, and bactericide / preservative is 1-3:0.1-1:0.1-1.

[0028] Furthermore, the thickener is selected from one or a combination of two of polyurethane thickeners and alkali-swellable thickeners. The alkali-swellable thickener is selected from associative alkali-swellable thickeners.

[0029] Furthermore, the water is selected from one or more combinations of distilled water, deionized water, and tap water.

[0030] The second technical solution adopted by the present invention is: a method for preparing the above-mentioned exposed water-based asphalt-based waterproof coating, comprising dispersing filler with water, and then grinding and mixing it with anionic emulsified asphalt, polymer emulsion and additives to obtain the exposed water-based asphalt-based waterproof coating.

[0031] Furthermore, the preparation method of the exposed water-based asphalt-based waterproof coating includes dispersing the filler with water, then grinding and mixing it with defoamer, bactericide and preservative, polymer emulsion and anionic emulsified asphalt at 15-30°C for 10-30 minutes, then adding a thickener and mixing to obtain the exposed water-based asphalt-based waterproof coating.

[0032] In this invention, the viscosity of the exposed water-based asphalt-based waterproof coating is 10000-15000 mPa·s.

[0033] Furthermore, the stirring and mixing temperature is 20–25°C, and the time is 15–20 min.

[0034] The third technical solution adopted in this invention is: a waterproof laminate, comprising a base layer, an asphalt waterproof membrane layer, an exposed waterproof coating and sintered sand arranged sequentially, wherein the exposed waterproof coating is formed by the above-mentioned exposed water-based asphalt waterproof coating.

[0035] Furthermore, the sintered sand is 2-16 mesh and white. Immediately after the final coat of the exposed water-based asphalt-based waterproof coating is applied, the sintered sand is evenly spread on the coating surface. This allows the sintered sand to embed well into the exposed water-based asphalt-based coating, firmly fixing it to the coating surface after the coating dries. This sintered sand layer not only provides protection but also reflects sunlight, reducing the temperature of the waterproofing system. Therefore, this waterproofing system can be better used in exposed environments, greatly extending the service life of the building's waterproofing system.

[0036] In some embodiments of the present invention, if the bitumen waterproof membrane layer has a removable release liner, the release liner must be removed before the waterproof coating is applied; if it is a non-removable PE membrane or has sand on its surface, no treatment is required and the exposed waterproof coating system can be applied directly.

[0037] Furthermore, the base layer is a building surface. For example, the building surface may be a roof.

[0038] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art:

[0039] This invention involves first uniformly mixing antioxidants and ultraviolet absorbers with the base asphalt, and then introducing them into the anionic emulsified asphalt through emulsification and grinding using a colloid mill. This not only improves the stability of the waterproof coating system and prevents demulsification, but also, combined with the use of weather-resistant polymer emulsions, fillers, and additives, significantly enhances the weather resistance of the prepared waterproof coating. Furthermore, the white sintered sand adhering to the coating surface reflects and protects against sunlight, making it suitable as an exposed product for waterproofing projects in buildings exposed to long-term outdoor environments.

[0040] The water-based asphalt-based waterproof coating of the present invention can be firmly bonded to the surface of different types of asphalt-based waterproof membrane products (waterproof membrane with non-removable PE film, waterproof membrane with removable release film, and sand-attached waterproof membrane), and firmly fixes the sintered sand, and is not afraid of environmental erosion.

[0041] The water-based asphalt-based waterproof coating of this invention does not stick to the feet after it dries completely, so people can walk on it directly without the need for a protective layer.

[0042] The water-based asphalt-based waterproof coating of this invention can be applied to the waterproofing construction of new buildings, applied to the upper layer of asphalt-based waterproof membranes. The skin-like 100% full adhesion of the waterproof coating can effectively solve the problem of water leakage caused by weak bonding at the overlapping edges of the waterproof membrane, and greatly extend the waterproof life of the waterproof system. It can also be applied to the waterproofing repair of old buildings. It can be applied directly to the cement base or to the aged waterproof membrane, which is simple, convenient and efficient. Attached Figure Description

[0043] Figure 1 shows the bonding effect between the waterproof coating with white sintered sand and the asphalt-based waterproof membrane (with a non-removable PE film) in Example 1.

[0044] Figure 2 shows a comparison of the waterproof coatings of Example 1 and Comparative Examples 1 and 3 after artificial climate aging test.

[0045] Figure 3 is a schematic diagram of the application of the waterproof coating of Example 1 on the asphalt-based waterproof membrane;

[0046] In the diagram: 1. White sintered sand layer; 2. Exposed waterproof coating; 3. Asphalt-based waterproof membrane layer; 4. Building cement base layer. Detailed Implementation

[0047] The technical solutions of the present invention will be described in detail below with reference to specific embodiments, so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not limited to the scope of the examples described. Example 1

[0048] The exposed water-based bitumen-based waterproof coating provided in this embodiment has the raw material formula shown in Table 1, and the preparation method is as follows:

[0049] (1) Preparation of anionic emulsified asphalt

[0050] Dissolve 3 parts of anionic emulsifier (slow-cracking and slow-setting composite anionic emulsifier) ​​in 37 parts of water to prepare soap solution, stir to dissolve for 1.5 hours, and heat to 50°C for later use;

[0051] Mix 56 parts of base asphalt (70# petroleum asphalt) and 4 parts of composite weather-resistant additive (antioxidant 1076 and ultraviolet absorber UV-326 in a mass ratio of 0.5:1) and heat to 120°C, stir evenly to obtain rubber compound;

[0052] Rubber compound and soap solution are added to a colloid mill for grinding, and the grinding temperature is controlled at 75℃. The mixture is ground in one pass to obtain weather-resistant anionic emulsified asphalt.

[0053] (2) Preparation of waterproof coating

[0054] The filler was dispersed in water, and then mixed with defoamer, bactericide and preservative, weather-resistant polymer emulsion and weather-resistant anionic emulsified asphalt for 20 minutes while controlling the temperature at 25°C. Then, a thickener was added to prepare a waterproof coating with a viscosity of 13000 mPa·s.

[0055] In this example, the weather-resistant polymer emulsion was purchased from Badifu, model FS-830.

[0056] The filler is hydrophobically modified nano-calcium carbonate.

[0057] The thickener is an associative alkali-swellable thickener. Example 2

[0058] The raw material formula of the exposed water-based asphalt-based waterproof coating provided in this embodiment is shown in Table 1, and the rest is the same as in Embodiment 1.

[0059] In this example, the raw materials for anionic emulsified asphalt are 45 parts base asphalt (70# petroleum asphalt), 1 part antioxidant 1010, 1 part ultraviolet absorber UV-328, 5 parts anionic emulsifier (slow-cracking and slow-setting composite anionic emulsifier) ​​and 48 parts water.

[0060] The filler is hydrophobically modified nano-silica. Example 3

[0061] The raw material formula of the exposed water-based asphalt-based waterproof coating provided in this embodiment is shown in Table 1, and the rest is the same as in Embodiment 1. Example 4

[0062] The raw material formula of the exposed water-based asphalt-based waterproof coating provided in this embodiment is shown in Table 1, and the rest is the same as in Embodiment 1. Example 5

[0063] The raw material formula of the exposed water-based asphalt-based waterproof coating provided in this embodiment is shown in Table 1, and the rest is the same as in Embodiment 3.

[0064] In this example, the weather-resistant polymer emulsion was purchased from Polymer, model BLJ-600, with a solid content of 50%.

[0065] Comparative Example 1

[0066] The water-based asphalt-based waterproof coating provided in this comparative example differs from that in Example 1 in that no composite weather-resistant additives are added when preparing the anionic emulsified asphalt.

[0067] Comparative Example 2

[0068] The water-based asphalt-based waterproof coating provided in this comparative example differs from that in Example 1 in that it uses a conventional polymer emulsion purchased from Badifu, model FS-670.

[0069] Comparative Example 3

[0070] The water-based asphalt-based waterproof coating provided in this comparative example differs from that in Example 1 in that no composite weather-resistant additives are added when preparing the anionic emulsified asphalt, and the polymer emulsion used in Comparative Example 2 is used instead of the polymer emulsion used in Comparative Example 2.

[0071] Comparative Example 4

[0072] The water-based waterproof coating provided in this comparative example differs from that in Example 1 in that: when preparing anionic emulsified asphalt, no composite weather-resistant additive is added; instead, the composite weather-resistant additive is added to the system together with additives such as defoamers.

[0073] Table 1 shows the raw material formulations (by weight) of the waterproof coatings in Examples 1-5.

[0074]

[0075]

[0076] The waterproof coating of Example 1 was applied to an asphalt-based waterproof membrane (with a non-removable PE film) with a coating thickness of 1.0 mm, and the result is shown in Figure 1.

[0077] As shown in Figure 1, the waterproof coating of Example 1 can adhere well to the bitumen-based waterproof membrane, forming a two-layer composite waterproof system of waterproof coating and waterproof membrane.

[0078] The performance of the waterproof coatings in Examples 1-5 and Comparative Examples 1-4 was tested according to the standard JCT408-2005 "Water-emulsified Bitumen-based Waterproof Coatings". The artificial climate aging treatment test was conducted according to the standard GBT16777-2008 "Test Methods for Waterproof Coatings for Buildings". The results are shown in Tables 2-3.

[0079] Table 2 Performance test results of waterproof coatings in Examples 1-5

[0080]

[0081] Table 3 shows the performance test results of the waterproof coatings in Comparative Examples 1–4.

[0082]

[0083]

[0084] As can be seen from Tables 2-3, the waterproof coatings of Examples 1-5 have excellent weather resistance, elongation properties and high and low temperature resistance, and can be used for waterproofing projects of exposed buildings.

[0085] In addition, Figure 2 shows a comparison of the waterproof coatings of Example 1, Comparative Example 1 and Comparative Example 3 after artificial climate aging test. It can be seen that only the coating surface of Example 1 is smooth and does not show cracks, and its weather resistance is the best.

[0086] When the waterproof coating described in the above embodiment is applied to the waterproofing construction of a building, as shown in Figure 3, an asphalt-based waterproof membrane layer 3 is laid on the building cement base layer 4, and then an asphalt-based waterproof coating is applied on the asphalt-based waterproof membrane layer 3 to form an exposed waterproof coating 2. Then, a 2-16 mesh white sintered sand layer 1 is laid on top of the coating. A skin-like 100% full adhesion effect can be formed between the exposed waterproof coating 2 and the asphalt-based waterproof membrane layer 3, which can effectively solve the problem of water leakage and water seepage caused by weak bonding at the overlapping edges of the waterproof membrane, and greatly extend the waterproof life of the waterproof system.

[0087] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0088] 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.

Claims

1. An exposed water-based bitumen-based waterproof coating, comprising anionic emulsified bitumen, polymer emulsion, filler, and additives, characterized in that: The anionic emulsified asphalt is obtained by emulsifying the melt-blended base asphalt and composite weather-resistant additive. The composite weather-resistant additive is a combination of antioxidant and ultraviolet absorber in a mass ratio of 0.5 to 2:

1. The polymer emulsion is one or more of the following: weather-resistant styrene-acrylic emulsion, weather-resistant pure acrylic emulsion, and weather-resistant silicone-acrylic emulsion. The mass ratio of the anionic emulsified asphalt, polymer emulsion, filler and additives is 20-50:20-50:5-25:0.1-5.

2. The exposed water-based bitumen-based waterproof coating according to claim 1, characterized in that: The mass ratio of the base asphalt to the composite weather-resistant additive is 40-65:1-5.

3. The exposed water-based bitumen-based waterproof coating according to claim 1 or 2, characterized in that, The preparation method of the anionic emulsified asphalt includes the following steps: (1) The base asphalt and the composite weather-resistant additive are melt-mixed at 120-140°C to obtain a rubber compound; (2) Dissolve the anionic emulsifier in water to obtain soap solution; (3) The rubber compound and soap solution are ground at 60-90°C to obtain the anionic emulsified asphalt.

4. The exposed water-based bitumen-based waterproof coating according to claim 3, characterized in that, In step (2), the temperature of the soap solution is controlled at 40-70°C and the dissolution time is 1-4 hours; and / or, the mass ratio of the base asphalt, composite weather-resistant additive, anionic emulsifier and water is 40-65:1-5:1-5:30-60.

5. The exposed water-based bitumen-based waterproof coating according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 1076, antioxidant 1010, antioxidant 168 and antioxidant 1098; and / or, the ultraviolet absorber is selected from one or more of UV-326, UV-328, UV-329, UV-928 and UV-400.

6. The exposed water-based bitumen-based waterproof coating according to claim 1, characterized in that: The filler is a hydrophobic filler, which is selected from one or more combinations of hydrophobic modified nano calcium carbonate, hydrophobic modified nano talc, and hydrophobic modified nano silica.

7. The exposed water-based bitumen-based waterproof coating according to claim 1, characterized in that: The anionic emulsified asphalt has a solid content of 50-60%, the polymer emulsion has a solid content of 45-55%, and the exposed water-based asphalt-based waterproof coating also contains water. The mass ratio of the anionic emulsified asphalt, polymer emulsion, hydrophobic filler, additives and water is 20-50:20-50:5-25:0.1-5:5-40.

8. The exposed water-based bitumen-based waterproof coating according to claim 7, characterized in that: The amount of solids in the polymer emulsion is greater than the amount of solids in the anionic emulsified asphalt.

9. The exposed water-based bitumen-based waterproof coating according to claim 1, characterized in that: The additives include one or a combination of thickeners, defoamers, and bactericides and preservatives.

10. The exposed water-based bitumen-based waterproof coating according to claim 9, characterized in that: The mass ratio of the thickener, defoamer, and bactericide / preservative is 1-3:0.1-1:0.1-1.

11. A method for preparing an exposed water-based bitumen-based waterproof coating according to any one of claims 1 to 10, characterized in that: The process involves dispersing fillers in water, then mixing them with anionic emulsified asphalt, polymer emulsion, and additives to obtain the exposed water-based asphalt-based waterproof coating.

12. A waterproof laminate, characterized in that: It includes a base layer, an asphalt waterproof membrane layer, an exposed waterproof coating, and sintered sand arranged in sequence, wherein the exposed waterproof coating is formed using any one of the exposed water-based asphalt waterproof coatings according to claims 1 to 10.

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