Asphalt-based waterproof coating capable of being exposed and preparation method

Abstract

The invention belongs to the technical field of waterproof coatings, and particularly relates to an asphalt-based waterproof coating capable of being exposed and a preparation method thereof. The preparation method is characterized in that anionic emulsified asphalt and powder are selected, acrylic emulsion with high matching degree with the powder is added, the anionic emulsified asphalt enhances the ductility of a paint film, the powder improves the heat resistance of the paint film, and the acrylic emulsion has excellent elongation at break and can increase the elongation at break of the paint film; and multiple types of defoaming agents are sequentially adopted in the preparation process, so that bubbles formed in the production and use processes are inhibited and eliminated, the phenomenon that the performance of a paint film is reduced due to the bubbles is eliminated, the durability and safety of the waterproof paint are improved, and the purpose of long-time exposure is achieved. Therefore, the waterproof coating has a very wide application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof coatings, and particularly relates to an asphalt-based externally exposable waterproof coating and a preparation method thereof. Background Art

[0002] At present, waterproof materials are widely used in the construction field. However, in the production and use processes of traditional waterproof coiled materials, a large amount of toxic and harmful gases and suspended particulate matters are easily generated during processes such as high-temperature treatment, stirring, and impregnation of materials such as asphalt, which pose hazards to the environment and human health. In addition to waterproof coiled materials, waterproof coatings can well cover all positions on the roof during use. And as the solvent in the coating volatilizes, the waterproof layer formed by the curing of the coating into a film is very complete, without leaving gaps, and has good low-temperature resistance, and can adapt to extreme temperature conditions. In particular, emulsified asphalt-based waterproof coatings combine the advantages of asphalt and waterproof coatings and have also been widely used. However, the existing emulsified asphalt waterproof coatings on the market are easily affected by environmental factors such as light, heat, and water. When encountering water, swelling may occur, the water resistance effect becomes poor, and the ultraviolet resistance performance is relatively weak. When exposed to ultraviolet light for a long time, cracks may appear in the paint film and the performance decreases. Therefore, it is particularly important to develop an asphalt-based externally exposable waterproof coating. Summary of the Invention

[0003] In view of this, the present application provides an asphalt-based externally exposable waterproof coating and a preparation method thereof. The waterproof coating selects anionic emulsified asphalt and powder materials, and adds an acrylic emulsion with a high degree of matching with the powder materials. The anionic emulsified asphalt enhances the ductility of the paint film, the powder materials improve the heat resistance of the paint film, and the acrylic emulsion has excellent elongation at break and can increase the elongation at break of the paint film. And various types of defoamers are used in the manufacturing process to suppress and eliminate the bubbles formed during the production and use processes, eliminate the reduction of the paint film performance caused by the bubbles, improve the durability and safety of the waterproof coating, and achieve the goal of long-term external exposure.

[0004] In order to achieve the above object, the present invention includes the following technical solutions to be realized:

[0005] Technical Solution 1:

[0006] An asphalt-based externally exposable waterproof coating, characterized in that it is mainly prepared from the following components according to the following mass ratio:

[0007] Water 12.1 - 17.15 parts,

[0008] Hydroxyethyl cellulose 0.34 - 0.4 parts,

[0009] Water-based dispersant 0.5 - 0.7 parts,

[0010] Silicone defoamer 0.5 - 0.6 parts,

[0011] 0.4 - 0.6 parts of silica defoamer,

[0012] 0.2 - 0.3 parts of water-based wetting agent,

[0013] 20 - 30 parts of powder,

[0014] 30 - 50 parts of acrylic emulsion,

[0015] 20 - 30 parts of anionic emulsified asphalt,

[0016] 0.1 - 0.2 parts of mildew preventive,

[0017] 0.1 - 0.2 parts of preservative,

[0018] 0.3 - 0.5 parts of mineral oil defoamer;

[0019] Furthermore, the powder is one or any combination of two or more of titanium dioxide, barium sulfate, and heavy calcium carbonate;

[0020] Furthermore, the powder is preferably 600 - 800 mesh.

[0021] Furthermore, the asphalt-based exposed waterproof coating further comprises 0.1 - 0.15 parts of pH regulator.

[0022] Technical solution two:

[0023] The preparation method of the asphalt-based exposed waterproof coating according to Technical solution one, characterized in that: it includes the following steps:

[0024] (1) At a rotation speed of 400 - 800 rpm, add water, hydroxyethyl cellulose, water-based dispersant, silicone defoamer, silica defoamer, and water-based wetting agent into the reaction kettle, and stir for 5 - 8 min;

[0025] (2) Add the powder into the reaction kettle, increase the rotation speed to 1000 - 1200 rpm, and stir for 8 - 12 min;

[0026] (3) Keep the rotation speed and add the acrylic emulsion into the reaction kettle, and disperse for 10 - 15 min;

[0027] (4) Reduce the rotation speed to 600 - 700 rpm, add the anionic emulsified asphalt into the reaction kettle, and disperse for 10 - 15 min;

[0028] (5) Reduce the rotation speed to 500 - 600 rpm, add the mildew preventive, preservative, and mineral oil defoamer into the reaction kettle and stir for 10 - 15 min.

[0029] Further, an appropriate amount of pH regulator is added during the process of step (1) to control the pH value of the solvent to be 7-9.

[0030] The asphalt-based externally exposable waterproof coating described in the present invention selects an acrylic emulsion with a high degree of matching with the powder. Moreover, this emulsion itself has excellent elongation at break, ensuring that the powder can be better dispersed in the emulsion system, having better compatibility with emulsified asphalt, ensuring the continuity of the system, and increasing the elongation at break of the paint film; it also uses an anionic emulsified asphalt that is green, environmentally friendly, and has good stability, in combination with a high-elastic and weather-resistant acrylic emulsion. By optimizing and screening the proportions of the acrylic emulsion, powder, and emulsified asphalt, the best ratio is obtained, enhancing the ductility of the paint film and improving the heat resistance of the paint film; during the preparation process of the asphalt-based externally exposable waterproof coating, various types of defoamers are used to inhibit and eliminate the possibility of forming bubbles during production and use, avoiding the reduction of the paint film performance caused by the generation of bubbles. Therefore, this type of waterproof coating has a very broad application prospect. Specific Embodiments

[0031] The exemplary embodiments disclosed in the present invention are described in more detail below. These embodiments are for the purpose of being able to more thoroughly understand the present invention and being able to fully convey the scope of the present invention disclosed to those skilled in the art. Although the exemplary embodiments of the present invention are shown, it should be understood that the present invention should not be limited by the embodiments described herein.

[0032] The specific embodiments and examples of the present invention are as follows:

[0033] (1) Specific embodiments of the asphalt-based externally exposable waterproof coating described in the present invention:

[0034] The asphalt-based externally exposable waterproof coating is mainly prepared from the following components according to the following mass ratio:

[0035] Water 12.1 - 17.15 parts,

[0036] Hydroxyethyl cellulose 0.34 - 0.4 parts,

[0037] Water-based dispersant 0.5 - 0.7 parts,

[0038] Silicone defoamer 0.5 - 0.6 parts,

[0039] Silica defoamer 0.4 - 0.6 parts,

[0040] Water-based wetting agent 0.2 - 0.3 parts,

[0041] Powder 20 - 30 parts,

[0042] Acrylic emulsion 30 - 50 parts,

[0043] Anionic emulsified asphalt 20 - 30 parts,

[0044] 0.1 - 0.2 parts of mildew preventive

[0045] 0.1 - 0.2 parts of preservative

[0046] 0.3 - 0.5 parts of mineral oil defoamer

[0047] The powder material is one or any combination of two or more of titanium dioxide, barium sulfate, and heavy calcium carbonate with a mesh size of 600 - 800, and preferably heavy calcium carbonate.

[0048] The asphalt-based externally exposable waterproof coating may further contain 0.1 - 0.15 parts of pH regulator.

[0049] (2) Specific implementation method of the preparation method of the asphalt-based externally exposable waterproof coating in the present invention:

[0050] (1) At a rotation speed of 400 - 800 rpm, add water, hydroxyethyl cellulose, water-based dispersant, a combination defoamer using silicone defoamer and silica defoamer, and water-based wetting agent into the reaction kettle, and stir for 5 - 8 min;

[0051] (2) Add the powder material into the reaction kettle, increase the rotation speed to 1000 - 1200 rpm, and stir for 8 - 12 min;

[0052] (3) Keep the rotation speed and add acrylic emulsion into the reaction kettle, and disperse for 10 - 15 min;

[0053] (4) Reduce the rotation speed to 600 - 700 rpm, add emulsified asphalt into the reaction kettle, and disperse for 10 - 15 min;

[0054] (5) Reduce the rotation speed to 500 - 600 rpm, add mildew preventive, preservative, and mineral oil defoamer into the reaction kettle and stir for 10 - 15 min.

[0055] During the process of step (1), add an appropriate amount of pH regulator to control the pH value of the solvent to be 7 - 9.

[0056] To further illustrate the above technical solutions of the present invention, the present invention sets 3 examples for the above-mentioned various implementation methods. The preferred brands of each material in the examples are as follows. In specific implementation, it is not limited to the following brands:

[0057] The brand of the hydroxyethyl cellulose is AkzoNobel, the brand of the pH regulator is King Industries, the brand of the aqueous dispersant is Rohm and Haas, the brand of the silicone defoamer is San Nopco, the brand of the silica defoamer is San Nopco, the brand of the aqueous wetting agent is Clariant, the selected powder material is heavy calcium carbonate, the brand is Jingfu, the brand of the acrylic emulsion is Bardgefu, the brand of the anionic emulsified asphalt is Shandong Baicheng, the brand of the mildew preventive is Lonza (China), and the brand of the preservative is Lonza (China).

[0058] Example 1:

[0059] Prepare the asphalt-based exposed waterproof coating according to the following steps:

[0060] (1) At a rotation speed of 400 rpm, add 12.1 parts of water, 0.34 parts of hydroxyethyl cellulose, 0.6 parts of aqueous dispersant, 0.5 parts of silicone defoamer, 0.6 parts of silica defoamer, and 0.2 parts of aqueous wetting agent into the reaction kettle, stir for 5 min, and add 0.1 part of pH regulator during this period to control the pH value of the solvent to 7;

[0061] (2) Add 25 parts of 600-mesh heavy calcium carbonate powder to the reaction kettle, increase the rotation speed to 1000 rpm, and stir for 8 min;

[0062] (3) Keep the rotation speed and add 50 parts of acrylic emulsion to the reaction kettle, and disperse for 15 min;

[0063] (4) Reduce the rotation speed to 600 rpm, add 20 parts of anionic emulsified asphalt to the reaction kettle, and disperse for 10 min;

[0064] (5) Reduce the rotation speed to 500 rpm, add 0.1 part of mildew preventive, 0.1 part of preservative, and 0.3 part of mineral oil defoamer to the reaction kettle and stir for 10 min.

[0065] Example 2:

[0066] Prepare the asphalt-based exposed waterproof coating according to the following steps:

[0067] (1) At a rotation speed of 800 rpm, add 17.15 parts of water, 0.36 parts of hydroxyethyl cellulose, 0.5 parts of aqueous dispersant, 0.6 parts of silicone defoamer, 0.4 parts of silica defoamer, and 0.3 parts of aqueous wetting agent into the reaction kettle, stir for 8 min, and add 0.15 part of pH regulator during this period to control the pH value of the solvent to 9;

[0068] (2) Add 30 parts of 700-mesh heavy calcium carbonate powder to the reaction kettle, increase the rotation speed to 1200 rpm, and stir for 12 min;

[0069] (3) Maintain the rotational speed, add 40 parts of acrylic emulsion into the reaction kettle, and disperse for 12 min;

[0070] (4) Reduce the rotational speed to 700 rpm, add 25 parts of anionic emulsified asphalt into the reaction kettle, and disperse for 14 min;

[0071] (5) Reduce the rotational speed to 550 rpm, add 0.2 part of mildew preventive, 0.2 part of preservative, and 0.5 part of mineral oil defoamer into the reaction kettle, and stir for 15 min.

[0072] Example 3:

[0073] Prepare the asphalt-based externally exposable waterproof coating according to the following steps:

[0074] (1) At a rotational speed of 600 rpm, add 15 parts of water, 0.4 part of hydroxyethyl cellulose, 0.7 part of water-based dispersant, 0.55 part of silicone defoamer, 0.5 part of silica defoamer, and 0.25 part of water-based wetting agent into the reaction kettle, stir for 7 min, and add 0.12 part of pH regulator during this period to control the pH value of the solvent to 8;

[0075] (2) Add 20 parts of 800-mesh heavy calcium powder into the reaction kettle, increase the rotational speed to 1100 rpm, and stir for 10 min;

[0076] (3) Maintain the rotational speed, add 30 parts of acrylic emulsion into the reaction kettle, and disperse for 10 min;

[0077] (4) Reduce the rotational speed to 650 rpm, add 30 parts of anionic emulsified asphalt into the reaction kettle, and disperse for 15 min;

[0078] (5) Reduce the rotational speed to 600 rpm, add 0.15 part of mildew preventive, 0.15 part of preservative, and 0.4 part of mineral oil defoamer into the reaction kettle, and stir for 12 min.

[0079] To verify the beneficial effects of the asphalt-based externally exposable waterproof coating in the present invention, the following 2 comparative examples are set: Comparative Example 1:

[0080] Prepare the rubber compound according to the following steps:

[0081] (1) At a rotational speed of 600 rpm, successively add 15 parts of water, 0.4 part of hydroxyethyl cellulose, 0.7 part of water-based dispersant, 0.6 part of silicone defoamer, 0.6 part of silica defoamer, and 0.2 part of water-based wetting agent, add pH regulator, control the pH value of the solvent to 8, and stir for 8 min;

[0082] (2) Add 23 parts of 700-mesh heavy calcium, increase the rotational speed to 1100 rpm, and stir for 10 min;

[0083] (3) Keep the rotational speed at 1100 rpm, add 35 parts of styrene-acrylic emulsion, and disperse for 10 min;

[0084] (4) Reduce the rotational speed to 600 rpm, add 30 parts of anionic emulsified asphalt, and disperse for 15 min;

[0085] (5) Keep the rotational speed at 600 rpm, add 0.1 part of preservative, 0.1 part of mildew preventive, and 0.5 part of mineral oil defoamer in sequence, and continue stirring for 15 min.

[0086] The main difference between the above comparative example and the example is that the acrylic emulsion is replaced with styrene-acrylic emulsion, and other materials use the same brands as those in the example.

[0087] Comparative Example 2:

[0088] Prepare the rubber compound according to the following steps:

[0089] (1) At a rotational speed of 700 rpm, add 12.1 parts of water, 0.4 part of hydroxyethyl cellulose, 0.7 part of water-based dispersant, 0.6 part of silicone defoamer, 0.6 part of silica defoamer, and 0.2 part of water-based wetting agent in sequence. Add a pH regulator to control the pH value of the solvent at 8, and stir for 8 min;

[0090] (2) Add 23 parts of 700-mesh heavy calcium carbonate, increase the rotational speed to 1100 rpm, and stir for 10 min;

[0091] (3) Reduce the rotational speed to 600 rpm, add 30 parts of anionic emulsified asphalt, and disperse for 15 min;

[0092] (4) Keep the rotational speed at 600 rpm, add 0.1 part of preservative, 0.1 part of mildew preventive, and 0.5 part of mineral oil defoamer in sequence, and continue stirring for 15 min.

[0093] Comparative Example 3:

[0094] (1) At a rotational speed of 400 rpm, add 15 parts of water, 0.34 part of hydroxyethyl cellulose, 0.7 part of water-based dispersant, 0.6 part of silicone defoamer, and 0.2 part of water-based wetting agent to the reaction kettle, stir for 5 min, and add a pH regulator during this period to control the pH value of the solvent at 7;

[0095] (2) Add 30 parts of 600-mesh heavy calcium carbonate powder to the reaction kettle, increase the rotational speed to 1000 rpm, and stir for 8 min;

[0096] (3) Keep the rotational speed, add 30 parts of acrylic emulsion to the reaction kettle, and disperse for 15 min;

[0097] (4) Reduce the rotational speed to 600 rpm, add 20 parts of emulsified asphalt to the reaction kettle, and disperse for 10 min;

[0098] (5) Reduce the rotational speed to 500 rpm, add 0.1 part of mildew preventive and 0.1 part of preservative into the reaction kettle and stir for 10 min.

[0099] The main differences between the above comparative examples and the examples are as follows: in Comparative Example 1, styrene-acrylic emulsion is used instead of acrylic emulsion; in Comparative Example 2, neither acrylic emulsion nor styrene-acrylic emulsion is added; in Comparative Example 3, neither silica-based defoamer nor mineral oil-based defoamer is used, and other materials use the same brands as those in the examples.

[0100] The above examples and comparative examples were tested, and the test results are as follows:

[0101]

[0102]

[0103]

[0104] The standards of some items in the above tests are as follows:

[0105] Viscosity: GB / T 21090-2007

[0106] Solid content: GB / T 16777-2008

[0107] Heat storage: GB 6753.3-86

[0108] Low-temperature freeze-thaw resistance: GB / T 16777-2008

[0109] Water impermeability test: GB / T 16777-2008

[0110] Heat resistance test: GB / T 16777-2008

[0111] Elongation at break test / tensile strength test under different conditions: GB / T 16777-2008

[0112] Total sum of formaldehyde / VOC / benezene series: JC1066-2008

[0113] As can be seen from the above test results, the waterproof coating obtained by using the formula and preparation method of the present invention selects an acrylic emulsion with a high degree of matching with the powder. Moreover, this emulsion itself has excellent elongation at break, ensuring that the powder can be better dispersed in the emulsion system, having better compatibility with emulsified asphalt, ensuring the continuity of the system, and increasing the elongation at break of the paint film. It also uses an anionic emulsified asphalt that is green, environmentally friendly and has good stability, in combination with a high-elastic and weather-resistant acrylic emulsion. By optimizing and screening the proportions of the acrylic emulsion, powder and emulsified asphalt, the best ratio is obtained, enhancing the ductility of the paint film and improving the heat resistance of the paint film. As can be seen from the comparative examples, the elongation at break of the paint film and the low-temperature freeze-thaw effect of the waterproof coatings prepared by replacing or not using the acrylic emulsion are different, which in turn affect the test results of the water impermeability test, alkali treatment, heat treatment and xenon lamp aging of the paint film. In addition, the waterproof coating obtained by using the formula and preparation method of the present invention uses various types of defoamers in the preparation of asphalt-based exposed waterproof coatings, suppressing and eliminating the possibility of forming bubbles during production and use, and avoiding the reduction of the paint film performance caused by the generation of bubbles. Therefore, this type of waterproof coating has a very broad application prospect.

[0114] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. An asphalt-based exposed waterproof coating, characterized in that: It is mainly prepared by the following components in the following mass ratio: 12.1-17.15 parts of water, Hydroxyethyl cellulose 0.34-0.4 parts, 0.5-0.7 parts of aqueous dispersant, 0.5-0.6 parts of silicone defoamer, 0.4-0.6 parts of silicon dioxide defoamer, 0.2-0.3 parts of aqueous wetting agent, 20-30 portions of powder, 30-50 parts of acrylic emulsion, 20-30 parts of anionic emulsified asphalt, 0.1-0.2 parts of mildew inhibitor, Preservative 0.1-0.2 parts, 0.3-0.5 parts of mineral oil defoamer.

2. The asphalt-based exposed waterproof coating according to claim 1, characterized in that: The powder is one of titanium dioxide, barium sulfate and calcium sulfate or any combination of any two or more thereof.

3. The asphalt-based exposed waterproof coating according to claim 1, characterized in that: The powder is 600-800 meshes.

4. The asphalt-based exposed waterproof coating according to claim 1, characterized in that: The asphalt-based exposed waterproof coating further comprises 0.1-0.15 parts of a pH regulator.

5. The method for preparing the asphalt-based exposed waterproof coating according to any one of claims 1 to 4, characterized in that: The steps are as follows: (1) Add water, hydroxyethyl cellulose, aqueous dispersant, silicone defoamer, silica defoamer, and aqueous wetting agent into a reaction kettle at a rotation speed of 400-800 rpm and stir for 5-8 minutes; (2) Add the powder into the reactor, increase the speed to 1000-1200 rpm, and stir for 8-12 minutes; (3) Maintaining the rotation speed, add the acrylic emulsion into the reactor and disperse for 10-15 minutes; (4) Reduce the speed to 600-700 rpm, add the anionic emulsified asphalt into the reactor, and disperse for 10-15 minutes; (5) Reduce the speed to 500-600 rpm, add the mildew inhibitor, preservative, and mineral oil defoamer into the reactor and stir for 10-15 minutes.

6. The method for preparing the asphalt-based exposed waterproof coating according to claim 5, characterized in that: During step (1), an appropriate amount of pH regulator is added to control the pH value of the solvent to be 7-9.

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