Non-cured rubber asphalt waterproof coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of asphalt coatings, and particularly relates to a non-cured rubber asphalt waterproof coating as well as a preparation method and application thereof. The non-cured rubber asphalt waterproof coating is prepared from the following components in parts by weight: 90 to 120 parts of matrix asphalt, 20 to 35 parts of desulfurized rubber powder, 40 to 50 parts of softening oil, 10 to 20 parts of SBR (Styrene Butadiene Rubber), 10 to 20 parts of polyacrylic resin, 2 to 5 parts of temperature-sensitive thixotropic agent and 50 to 80 parts of filler. The non-cured rubber asphalt is obtained by adding the desulfurized rubber powder and the polyacrylic resin into the non-cured asphalt for modification, so that the viscosity, the ductility and the low-temperature flexibility of the non-cured asphalt can be remarkably improved, and the non-cured rubber asphalt is suitable for being used in dark, wet and cold environments.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt coatings, and specifically relates to a non-curing rubber asphalt waterproof coating and a preparation method and application thereof. Background Art

[0002] Non-curing rubber asphalt waterproof coating (referred to as "non-curing coating") is a type of waterproof coating that is made of asphalt and rubber as the main raw materials, mixed with additives and other materials, and has the characteristics of creep and self-adhesion, and has the properties of waterproofing, bonding, sealing, and grouting slurry. The coating maintains adhesion, self-healing, and creep properties for a long time in the application state. The coating has strong self-healing ability, sticks to the touch, and is difficult to peel off. It can be used as a waterproof layer alone, or it can be bonded to a roll to form a composite waterproof layer. Its super waterproof property is widely used in many fields such as basement exterior walls, municipal engineering, roads and bridges. However, the elongation performance and low-temperature flexibility of the existing non-curing rubber asphalt waterproof coating cannot adapt to use in dark, damp and cold environments, such as basements and other areas. Cracks will appear, resulting in the failure of the waterproof coating's waterproofness. Summary of the invention

[0003] In view of the problems existing in the existing non-curing rubber asphalt waterproof coatings mentioned in the background technology, the present invention provides a non-curing rubber asphalt waterproof coating and a preparation method and application thereof. The non-curing rubber asphalt is obtained by adding desulfurized rubber powder and polyacrylic acid resin to the non-curing asphalt for modification, which can significantly improve the viscosity, elongation and low-temperature flexibility of the non-curing asphalt, making it suitable for use in dark, wet and cold environments.

[0004] The specific technical solutions of the present invention are as follows:

[0005] First, the present invention provides a method for preparing a non-curing rubber asphalt waterproof coating, comprising the following steps:

[0006] S1: preparing desulfurized rubber powder: placing rubber powder and a desulfurizing agent in a reactor, injecting carbon dioxide gas into the reactor to replace air, and heating the reactor to obtain desulfurized rubber powder after the replacement is completed;

[0007] S2 Preparation of coating: Add base asphalt and aromatic oil into a reaction container, mix and heat, then add SBR and polyacrylic resin, add desulfurized rubber powder and thermosensitive thixotropic agent after SBR and polyacrylic resin are fully swollen, stir and keep warm and then shear, continue to stir and keep warm after shearing, add talcum powder to disperse, and after the talcum powder is dispersed, cast into a mold to obtain the coating.

[0008] Furthermore, the carbon dioxide concentration in the reactor in step S1 is 0.6 g / cm 3 The reaction temperature is 160-200°C, the heating rate is 5-10°C / min, and the reaction time is 20-30min.

[0009] Furthermore, in the step S2, the mixing heating temperature is 170-180° C., the heat preservation and stirring temperature is 170-180° C., and the heat preservation and stirring time is 30-60 min.

[0010] The present invention also provides a non-curing rubber asphalt waterproof coating, comprising the following components in parts by weight: 90 to 120 parts of base asphalt, 20 to 35 parts of desulfurized rubber powder, 40 to 50 parts of softening oil, 10 to 20 parts of SBR rubber, 10 to 20 parts of polyacrylic acid resin, 2 to 5 parts of temperature-sensitive thixotropic agent and 50 to 80 parts of filler.

[0011] Furthermore, the desulfurized rubber powder has a softening point of 70 to 105° C., a low-temperature flexibility of -30 to -25° C., an extension length of 35 to 45 mm, and a viscosity of 135° of 1 to 5 Pa·s.

[0012] Furthermore, the softening oil is aromatic oil or rubber filler oil, with a density of 0.91 to 0.96 g / cm3 and a viscosity of 4000 to 6000 mPa·s.

[0013] Furthermore, the filler is talc or kaolin, and the temperature-sensitive thixotropic agent is one or more of ethylene wax, oxidized polyethylene wax, and polyamide wax.

[0014] The invention also provides an application of a non-curing rubber asphalt waterproof coating in a basement waterproof structure.

[0015] Furthermore, the waterproof structure includes a polyethylene polypropylene upper layer, a waterproof coating middle layer and a polyethylene polypropylene lower layer, the polyethylene polypropylene upper layer has a thickness of 0.5 to 0.7 cm, the waterproof coating middle layer has a thickness of 2 to 2.5 cm, and the polyethylene polypropylene lower layer has a thickness of 0.5 to 0.7 cm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) The present invention obtains non-solidified rubber asphalt by adding desulfurized rubber powder and polyacrylic acid resin to non-solidified asphalt, and limits the degree of desulfurization of the desulfurized rubber powder. It is found that the desulfurized rubber powder and polyacrylic acid resin can significantly improve the viscosity, elongation and low-temperature flexibility of the non-solidified asphalt. At the same time, by adding polyacrylate to the non-solidified asphalt, the viscosity of the coating system can be adjusted, and the high temperature resistance and low-temperature flexibility of the coating can be further improved. The polyacrylate and desulfurized waste rubber powder can be organically combined to enhance the dispersibility of the desulfurized waste rubber powder in the asphalt. This ensures that the prepared non-solidified rubber asphalt can be used in cold and humid environments.

[0018] 2) In the application, a composite structure of polyethylene polypropylene membrane + non-curing rubber asphalt + polyethylene polypropylene membrane is adopted. The non-curing asphalt plays the main waterproofing role, while the polyethylene polypropylene plays a protective and auxiliary waterproofing role. The non-curing asphalt and the polyethylene polypropylene membrane have good bonding properties, thus being able to meet the waterproofing needs in dark, damp and cold basements. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0020] Example 1

[0021] A method for preparing a non-curing rubber asphalt waterproof coating comprises the following steps:

[0022] S1: preparing desulfurized rubber powder: placing rubber powder and a desulfurizing agent in a reactor, injecting carbon dioxide gas into the reactor to replace air, and heating the reactor to obtain desulfurized rubber powder after the replacement is completed;

[0023] Specifically, 100 g of rubber powder was placed in a high-pressure reactor, and 25 g of diphenyl disulfide and dry ice were added thereto. Carbon dioxide gas was introduced into the high-pressure reactor until the concentration of carbon dioxide gas in the reactor reached 0.6 g / cm 3 After the replacement is completed, the heating is turned on at a heating rate of 5°C / min, and the temperature is raised to 180°C for 20 minutes. After the reaction is completed, the carbon dioxide in the autoclave is released after the autoclave is naturally cooled to room temperature to obtain desulfurized rubber powder. The desulfurized rubber powder has a softening point of 76.5°C, low-temperature flexibility of -27.9°C, an extension length of 40.3mm, and a viscosity of 2.5Pa·s at 135°.

[0024] S2 Preparation of coating: Add base asphalt and aromatic oil into a reaction container and heat them, then add SBR thereto, add desulfurized rubber powder and thermosensitive thixotropic agent thereto after SBR is fully swollen, stir at heat preservation and then shear, continue to stir at heat preservation after shearing, then add talcum powder thereto to disperse, and after the talcum powder is dispersed, cast into a mold to obtain the coating.

[0025] Specifically, 100g of base asphalt and 50g of aromatic oil are added to a reaction container and mixed. After the mixture is evenly mixed, 15g of SBR and 15g of polyacrylic acid resin are added thereto after heating to 170°C. After the SBR and polyacrylic acid resin are fully swollen, 25g of desulfurized rubber powder and 2g of thermosensitive thixotropic agent prepared in step S1 are added, and the mixture is reacted at 170°C for 30min. Then, after shearing for 10min using a high-speed shear emulsifier, 60g of talcum powder is added thereto after continued heat preservation and stirring at 170°C for 30min, and the reaction is terminated after the talcum powder is completely dispersed. The casting mold is naturally cooled to obtain the coating.

[0026] The present embodiment also provides a cured rubber asphalt waterproof coating, comprising 100 parts of base asphalt, 50 parts of aromatic oil, 15 parts of SBR, 15 parts of polyacrylic resin, 25 parts of desulfurized rubber powder, 2 parts of temperature-sensitive thixotropic agent and 60 parts of filler.

[0027] This embodiment also provides an application of a cured rubber asphalt waterproof coating in a basement waterproof structure, wherein the waterproof structure comprises a polyethylene polypropylene upper layer, a waterproof coating middle layer, and a polyethylene polypropylene lower layer. The polyethylene polypropylene upper layer is 0.5 cm thick, the waterproof coating middle layer is 2 cm thick, and the polyethylene polypropylene lower layer is 0.7 cm thick.

[0028] Example 2

[0029] The difference between this embodiment and embodiment 1 is that the preparation method and performance of the desulfurized rubber powder are different. Specifically, 100 g of rubber powder is placed in a high-pressure reactor, and 20 g of diphenyl disulfide and dry ice are added thereto as a desulfurizing agent. Carbon dioxide gas is introduced into the high-pressure reactor until the concentration of carbon dioxide gas in the reactor is 0.6 g / cm 3 After the replacement is completed, the heating is turned on at a heating rate of 5°C / min, and the temperature is raised to 170°C for 30 minutes. After the reaction is completed, the carbon dioxide in the autoclave is released after the autoclave is naturally cooled to room temperature to obtain desulfurized rubber powder. The desulfurized rubber powder has a softening point of 73.6°C, low-temperature flexibility of -29.4°C, an extension length of 44.1mm, and a viscosity of 1.9Pa·s at 135°.

[0030] Example 3

[0031] The difference between this embodiment and embodiment 1 is that the components of the cured rubber asphalt waterproof coating are different in weight parts, specifically, including 100 parts of base asphalt, 50 parts of aromatic oil, 10 parts of SBR, 20 parts of polyacrylic acid resin, 30 parts of desulfurized rubber powder, 2 parts of thermosensitive thixotropic agent and 60 parts of filler.

[0032] Comparative Example 1

[0033] The difference between this comparative example and Example 1 is that the preparation method and performance of the desulfurized rubber powder are different. Specifically, 100 g of rubber powder is placed in a high-pressure reactor, and 10 g of diphenyl disulfide and dry ice are added thereto as a desulfurizing agent. Carbon dioxide gas is introduced into the high-pressure reactor until the concentration of carbon dioxide gas in the reactor is 0.6 g / cm 3 After the replacement is completed, the heating is turned on at a heating rate of 5°C / min, and the temperature is raised to 170°C for 30 minutes. After the reaction is completed, the carbon dioxide in the autoclave is released after the autoclave is naturally cooled to room temperature to obtain desulfurized rubber powder. The desulfurized rubber powder has a softening point of 121.3°C, low-temperature flexibility of -14.9°C, extension length of 11.5mm, and viscosity of 9.3Pa·s at 135°.

[0034] Comparative Example 2

[0035] The difference between this comparative example and Example 1 is that the weight parts of the components of the cured rubber asphalt waterproof coating are different, specifically, including 100 parts of base asphalt, 50 parts of aromatic oil, 15 parts of SBR, 25 parts of desulfurized rubber powder, 2 parts of thermosensitive thixotropic agent and 60 parts of filler.

[0036] The various properties of the non-curing rubber asphalt waterproof coatings prepared in the above examples and comparative examples were tested, and the test results are shown in Table 1 below:

[0037] Table 1: Test results of examples and comparative examples

[0038]

[0039] Experimental example

[0040] In 2023, in a civil air defense basement of a construction project in Hubei, the groundwater level was 5.3 meters above the floor, and the average humidity was 50-70%. The laboratory simulated the bonding test of the non-curing rubber asphalt waterproof coating under this environment. The experimental group adopted the waterproof structure in Example 1 of the present invention: the waterproof structure includes an upper layer of polyethylene polypropylene, a middle layer of waterproof coating and a lower layer of polyethylene polypropylene, wherein the thickness of the upper layer of polyethylene polypropylene is 0.5 cm, the thickness of the middle layer of waterproof coating is 2 cm, and the thickness of the lower layer of polyethylene polypropylene is 0.7 cm. The control group adopted the non-curing rubber asphalt waterproof coating prepared in Comparative Example 1 of the present invention, and the waterproof structure was the same as that of the experimental group. The test time was 50d.

[0041] The test results show that the cured rubber asphalt waterproof coating prepared in the embodiment of the present invention has good compatibility with the polyethylene polypropylene coil, and can achieve full adhesion with the ground cement without detachment during the test time. In the control group, the non-cured rubber asphalt waterproof coating prepared in Comparative Example 1 was combined with the polyethylene polypropylene coil as a waterproof structure, and the detachment phenomenon occurred after a slightly longer test time, and the detachment was irreversible. The specific reason is that although there was no obvious water seepage, it would have a serious negative impact on the waterproof effect in the actual waterproof project.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. In addition, it should be understood that although this specification is described in accordance with the embodiments, it does not contain only one technical solution. This narrative of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a non-curing rubber asphalt waterproof coating, characterized in that: The following steps are involved: S1: preparing desulfurized rubber powder: placing rubber powder and a desulfurizing agent in a reactor, injecting carbon dioxide gas into the reactor to replace air, and heating the reactor to obtain desulfurized rubber powder after the replacement is completed; S2 Preparation of coating: Add base asphalt and aromatic oil into a reaction container, mix and heat, then add SBR and polyacrylic resin, add desulfurized rubber powder and thermosensitive thixotropic agent after SBR and polyacrylic resin are fully swollen, stir and keep warm and then shear, continue to stir and keep warm after shearing, add talcum powder to disperse, and after the talcum powder is dispersed, cast into a mold to obtain the coating.

2. The method for preparing a non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The carbon dioxide concentration in the reactor in step S1 is 0.6 g / cm 3 The reaction temperature is 160-200°C, the heating rate is 5-10°C / min, and the reaction time is 20-30min.

3. The method for preparing a non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: In the step S2, the mixing heating temperature is 170-180° C., the heat preservation and stirring temperature is 170-180° C., and the heat preservation and stirring time is 30-60 min.

4. A non-curing rubber asphalt waterproof coating prepared by the method for preparing a non-curing rubber asphalt waterproof coating according to any one of claims 1 to 3, characterized in that: The invention comprises the following components by weight: 90-120 parts of base asphalt, 20-35 parts of desulfurized rubber powder, 40-50 parts of softening oil, 10-20 parts of SBR rubber, 10-20 parts of polyacrylic acid resin, 2-5 parts of temperature-sensitive thixotropic agent and 50-80 parts of filler.

5. The non-curing rubber asphalt waterproof coating according to claim 4, characterized in that: The desulfurized rubber powder has a softening point of 70 to 105° C., a low-temperature flexibility of -30 to -25° C., an extension length of 35 to 45 mm, and a viscosity of 135° of 1 to 5 Pa·s.

6. The non-curing rubber asphalt waterproof coating according to claim 4, characterized in that: The softening oil is aromatic oil or rubber filling oil, with a density of 0.91-0.96 g / cm3 and a viscosity of 4000-6000 mPa·s.

7. The non-curing rubber asphalt waterproof coating according to claim 4, characterized in that: The filler is talc or kaolin, and the temperature-sensitive thixotropic agent is one or more of ethylene wax, oxidized polyethylene wax, and polyamide wax.

8. Application of a non-curing rubber asphalt waterproof coating in a basement waterproof structure, characterized in that: The non-curing rubber asphalt waterproof coating is prepared by the preparation method of a non-curing rubber asphalt waterproof coating as described in any one of claims 1 to 3 or is a non-curing rubber asphalt waterproof coating as described in any one of claims 4 to 7.

9. The use of a non-curing rubber asphalt waterproof coating in a basement waterproof structure according to claim 8, characterized in that: The waterproof structure comprises a polyethylene polypropylene upper layer, a waterproof coating middle layer and a polyethylene polypropylene lower layer, wherein the polyethylene polypropylene upper layer has a thickness of 0.5 to 0.7 cm, the waterproof coating middle layer has a thickness of 2 to 2.5 cm, and the polyethylene polypropylene lower layer has a thickness of 0.5 to 0.7 cm.

Images