Exposed quick-drying polymer cement waterproof coating and preparation method thereof

Abstract

The invention discloses an exposed quick-drying polymer cement waterproof coating and a preparation method thereof, and belongs to the field of building waterproof materials. The invention comprises an exposed quick-drying polymer cement waterproof coating and a preparation method thereof, and is characterized in that the coating is composed of a liquid material and a powder material. Wherein the liquid material is prepared from the following components in percentage by mass: 0 to 5 percent of pure acrylic emulsion, 75 to 85 percent of low-temperature flexible styrene-acrylic emulsion, 0.1 to 0.3 percent of bactericide, 0.5 to 1 percent of organic silicon defoaming agent, 0.3 to 0.5 percent of potassium salt dispersing agent, 0.1 to 0.3 percent of silane coupling agent, 1 to 2 percent of environment-friendly plasticizer, 8 to 15 percent of water, 0.2 to 0.5 percent of polyurethane thickening agent and 0.2 to 0.5 percent of anti-ultraviolet agent. The powder material comprises the following components in percentage by mass: 40%-50% of white Portland cement, 2.5%-5% of quick-hardening sulphoaluminate cement, 15%-20% of quartz sand, 10%-20% of ground calcium carbonate and 15%-20% of composite functional powder. The ratio of the liquid material to the powder material is 1: (1.25-1.5). Through the mutual synergistic effect of the waterproof emulsion and the anti-ultraviolet agent in the liquid material and the composite functional powder in the powder material, the weather resistance of a product system is improved, meanwhile, the drying time of the product after construction is shortened, the influence of weather change on the integrity of the product is reduced, and the product achieves the dual effects of long-term exposure and quick drying.

Description

Technical Field

[0001] This invention belongs to the field of building waterproofing materials, and more specifically, relates to an exposed, fast-drying polymer cement waterproof coating and its preparation method. Background Technology

[0002] Exposed roof waterproof coatings, as a new type of exposed waterproof coating, have been vigorously promoted and used in recent years.

[0003] Single-component waterproof coatings are widely used due to their ease of application. However, they have a long drying time, with surface drying taking 6-8 hours and complete drying taking over 24 hours. This can lead to peeling, wrinkling, or blistering when the weather is unstable during the rainy season and the coating is not fully dry before coming into contact with water. Patents 2025104322229 ("An Asphalt-Based Exposed Waterproof Coating and Preparation Method Thereof"), 2025100705015 ("An Ultraviolet Crosslinking Waterborne Roofing Waterproof Coating and Its Preparation and Application"), and 202310902272 X ("A Waterborne Single-Component Exposed Waterproof Coating with Excellent Weather Resistance") all belong to this type, and their disadvantages are more pronounced when rushing to complete construction during the rainy season.

[0004] Ordinary two-component polymer cement waterproof coatings are limited in use due to their poor aging resistance and inability to be used outdoors. Some manufacturers have improved and optimized two-component polymer cement waterproof coatings to give them certain weather resistance. Patents 202410106961 "A High Weather-Resistant Acrylic Polymer Cement Waterproof Coating, Preparation Method and Application", 202411072193 "A High Weather-Resistant Polymer Cement Waterproof Coating and Preparation Method", 202411154986 "An Anti-Aging Polymer Cement Waterproof Coating and Preparation Method", and 202411065295 "A Weather-Resistant Polymer Cement Waterproof Coating and Preparation Method" all aim to improve the weather resistance of the waterproof layer by changing the structure of the coating system. However, the manufacturing cost is relatively high, making large-scale promotion difficult. While patent 202311281078 "A Quick-Drying Polymer Cement Waterproof Coating" improves the drying time of the waterproof coating and reduces the coating's climate requirements, the waterproof system still cannot be used outdoors.

[0005] In view of the problems existing in the existing technology or products, it is necessary to develop a polymer cement waterproof coating that can be exposed for a long time and achieve quick drying. Summary of the Invention

[0006] To address the problems existing in current polymer waterproof coatings, this invention provides an exposed, fast-drying polymer cement waterproof coating and its preparation method. By optimizing the system formulation, the weather resistance of the waterproof layer is improved, enabling it to be exposed for a long time while also achieving rapid drying, thus reducing the dependence of waterproof coating construction on the climate environment.

[0007] The exposed, fast-drying polymer cement waterproof coating consists of liquid and powder components. The liquid component, by weight percentage, comprises: 0%–5% pure acrylic emulsion, 75%–85% low-temperature flexible styrene-acrylic emulsion, 0.1%–0.3% bactericide, 0.5%–1% silicone defoamer, 0.3%–0.5% potassium salt dispersant, 0.1%–0.3% silane coupling agent, 1%–2% environmentally friendly plasticizer, 8%–15% water, 0.2%–0.5% polyurethane thickener, and 0.2%–0.5% UV stabilizer. The powder component, by weight percentage, comprises: 40%–50% white silicate cement, 2.5%–5% rapid-hardening sulfoaluminate cement, 15%–20% quartz sand, 10%–20% heavy calcium carbonate, and 15%–20% composite functional powder. The ratio of liquid to powder is 1:1.25–1.5.

[0008] The environmentally friendly plasticizers mentioned are dioctyl phthalate, silicone defoamer, bactericide, potassium salt dispersant, UV stabilizer, and polyurethane thickener, all of which are commercially available products.

[0009] The silane coupling agent is model KH-550.

[0010] The white silicate cement has a strength grade of PW 42.5, and the rapid-hardening sulfoaluminate cement is a commercially available product.

[0011] The quartz sand has a fineness of 200 mesh, and the heavy calcium carbonate has a fineness of 800 mesh.

[0012] The composite functional powder is a self-formulated anti-aging, acid and alkali resistant, and UV resistant powder with a fineness of 3000 mesh.

[0013] The present invention also proposes a method for preparing an exposed, fast-drying polymer cement waterproof coating. The specific steps are as follows: (1) The liquid preparation process is as follows: a. Add pure acrylic emulsion, low-temperature flexible styrene-acrylic emulsion and water to the liquid mixing tank, control the stirring speed to 200~300 r / min and the stirring time to 10 min~20 min; b. Add bactericide, organosilicon defoamer, potassium salt dispersant, UV stabilizer and environmentally friendly plasticizer to the liquid mixing tank in sequence, control the stirring speed to 300~400 r / min and the stirring time to 30~45 min; c. Add silane coupling agent, control the stirring speed to 300~400 r / min and the stirring time to 30~45 min; d. Add polyurethane thickener, control the stirring speed to 400~500 r / min and the stirring time to 10~20 min; e. Discharge and package to obtain an exposed, fast-drying polymer cement waterproof coating liquid. (2) The powder preparation process is as follows: a. Add white silicate cement, quartz sand and heavy calcium carbonate to the powder mixing tank in sequence, and control the stirring speed to 30~45 r / min and the stirring time to 25~45 min; b. Add rapid hardening sulfoaluminate cement, and control the stirring speed to 40~50 r / min and the stirring time to 30~40 min; c. Add composite functional powder, and control the stirring speed to 40~50 r / min and the stirring time to 20~30 min; d. Discharge and package to obtain a powder of a quick-drying polymer cement waterproof coating that can be exposed.

[0014] Compared with the prior art, the present invention provides an exposed, fast-drying polymer cement waterproof coating and its preparation method, which has the following beneficial effects: (1) The exposed, fast-drying polymer cement waterproof coating proposed in the present invention has a unique imitation stone silver-gray appearance, does not change color after long-term exposure, has strong environmental adaptability, and does not cause glare effect. (2) The addition of UV stabilizers in the liquid material and composite functional powders in the powder material improves the weather resistance of the waterproof coating under long-term exposure, so that the coating maintains stable physical properties during the exposure process on the roof. (3) The fast-hardening sulfoaluminate cement added in the present invention reduces the drying time of the waterproof coating, reducing the drying time to 1-2 hours, which has obvious advantages in rainy season construction and rush construction. (4) The product of the present invention, through the reasonable combination of powders in the system, ensures that the waterproof layer will not crack or break while drying quickly, thus ensuring the rapid construction of the waterproof coating; at the same time, rainwater will not damage the integrity of the waterproof layer 1.5 hours after the waterproof coating is completed. Attached Figure Description

[0015] The attached diagram in the instruction manual [ Figure 1 [This refers to the appearance of an exposed, fast-drying polymer cement waterproof coating.] Detailed Implementation

[0016] Detailed Description of Embodiments To make the objectives, technical solutions, and beneficial effects of this invention clearer, the preferred embodiments of this invention are described in detail below to facilitate understanding by those skilled in the art. All products described in this invention are tested according to the relevant requirements for water-based polymer coatings in GB / T16777-2008 "Test Methods for Waterproof Coatings for Buildings".

[0017] Example 1: An exposed, fast-drying polymer cementitious waterproof coating, by weight percentage, has the following liquid component mixing ratio and preparation method: 85% low-temperature flexible styrene-acrylic emulsion and 11.35% water are added sequentially to a mixing tank, with the stirring speed controlled at 200 r / min for 10 min; 0.2% bactericide, 0.8% silicone defoamer, 0.5% potassium salt dispersant, 0.3% UV stabilizer, and 1.5% environmentally friendly plasticizer are added sequentially to the mixing tank, with the stirring speed controlled at 400 r / min for 25 min; 0.15% silane coupling agent is added, with the stirring speed controlled at 400 r / min for 30 min; and 0.2% polyurethane thickener is added, with the stirring speed controlled at 450 r / min for 20 min. The liquid component is then discharged and packaged. The powder mix proportions and preparation method, by weight percentage, are as follows: Add 45% white silicate cement, 20% quartz sand, and 17.5% heavy calcium carbonate sequentially to a powder mixing tank, controlling the mixing speed at 35 r / min and the mixing time at 35 min; add 2.5% rapid-hardening sulfoaluminate cement, controlling the mixing speed at 40 r / min and the mixing time at 30 min; add 15% composite functional powder, controlling the mixing speed at 50 r / min and the mixing time at 30 min; discharge and package to obtain the powder. Film formation testing was conducted according to a liquid-to-powder ratio of 1:1.25. The test data are shown in Table 1.

[0018] Comparative Example 1: Compared with Example 1, all proportions and processes were kept unchanged, but the liquid to powder ratio was changed to 1:1.5 for film formation testing. The test data are shown in Table 1.

[0019] Example 2: An exposed, fast-drying polymer cementitious waterproof coating, by weight percentage, has the following liquid component mixing ratio and preparation method: 5% pure acrylic emulsion, 75% low-temperature flexible styrene-acrylic emulsion, and 15.8% water are added sequentially to a mixing tank, with the stirring speed controlled at 250 r / min for 15 min; 0.1% bactericide, 0.3% organosilicon defoamer, 0.5% potassium salt dispersant, 0.5% UV stabilizer, and 2% environmentally friendly plasticizer are added sequentially to the mixing tank, with the stirring speed controlled at 400 r / min for 30 min; 0.3% silane coupling agent is added, with the stirring speed controlled at 400 r / min for 30 min; and 0.5% polyurethane thickener is added, with the stirring speed controlled at 450 r / min for 20 min. The liquid component is then discharged and packaged. The powder mix proportions and preparation method, by weight percentage, are as follows: Add 40% white silicate cement, 15% quartz sand, and 20% heavy calcium carbonate sequentially to a powder mixing tank, controlling the mixing speed at 35 r / min and the mixing time at 30 min; add 5% rapid-hardening sulfoaluminate cement, controlling the mixing speed at 40 r / min and the mixing time at 30 min; add 20% composite functional powder, controlling the mixing speed at 45 r / min and the mixing time at 30 min; discharge and package to obtain the powder. Film formation testing was conducted according to a liquid-to-powder ratio of 1:1.35. The test data are shown in Table 1.

[0020] Comparative Example 2: Compared with Example 2, all proportions and processes were kept unchanged, but the liquid to powder ratio was changed to 1:1.5 for film formation testing. The test data are shown in Table 1.

[0021] Example 3: An exposed, fast-drying polymer cementitious waterproof coating, by weight percentage, has the following liquid component mixing ratio and preparation method: 5% pure acrylic emulsion, 80% low-temperature flexible styrene-acrylic emulsion, and 10.2% water are added sequentially to a mixing tank, with the mixing speed controlled at 300 r / min for 20 min; 0.3% bactericide, 1% organosilicon defoamer, 0.5% potassium salt dispersant, 0.5% UV stabilizer, and 2% environmentally friendly plasticizer are added sequentially to the mixing tank, with the mixing speed controlled at 400 r / min for 45 min; 0.3% silane coupling agent is added, with the mixing speed controlled at 400 r / min for 45 min; and 0.2% polyurethane thickener is added, with the mixing speed controlled at 500 r / min for 20 min. The liquid component is then discharged and packaged. The powder mix proportions and preparation method, by weight percentage, are as follows: Add 50% white silicate cement, 15% quartz sand, and 12.5% ​​heavy calcium carbonate sequentially to a powder mixing tank, controlling the mixing speed at 45 r / min and the mixing time at 45 min; add 2.5% rapid-hardening sulfoaluminate cement, controlling the mixing speed at 50 r / min and the mixing time at 40 min; add 20% composite functional powder, controlling the mixing speed at 50 r / min and the mixing time at 30 min; discharge and package to obtain the powder. Film formation testing was conducted according to a liquid-to-powder ratio of 1:1.25. The test data are shown in Table 1.

[0022] Comparative Example 3: A commercially available polymer cement waterproof coating from a manufacturer, meeting national standards, with a liquid-to-powder ratio of 1:1.2. Test data are shown in Table 1.

[0023] Table 1. Performance test data for both the examples and comparative examples.

[0024] The test data shows that, as can be seen from the data of Examples 1-3 and Comparative Example 3, the tensile strength and elongation at break of the product of the present invention have high stability after immersion treatment, alkali treatment, heat treatment and ultraviolet treatment. It has good adaptability and stability to environmental changes during long-term outdoor exposure. At the same time, the product of the present invention dries more than twice as fast as ordinary national standard polymer cement waterproof coatings after construction. It can dry within 1.5 hours and is not affected by rain.

[0025] Meanwhile, during the process of increasing the liquid-to-powder ratio, the tensile strength of the product increased, but the elongation decreased significantly. The performance remained relatively stable after immersion treatment, alkali treatment, heat treatment, and ultraviolet treatment. This is because the weather resistance of the product is enhanced by the combined effects of the emulsion's weather resistance in the liquid component, the UV stabilizer, and the composite functional powder in the powder component.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the scope of the present invention, and these improvements all fall within the protection scope of the present invention.

Claims

1. An exposed, fast-drying polymer cement waterproof coating and its preparation method, characterized in that, The coating consists of liquid and powder components. The liquid component, by weight percentage, comprises: 0%–5% pure acrylic emulsion, 75%–85% low-temperature flexible styrene-acrylic emulsion, 0.1%–0.3% bactericide, 0.5%–1% silicone defoamer, 0.3%–0.5% potassium salt dispersant, 0.1%–0.3% silane coupling agent, 1%–2% environmentally friendly plasticizer, 8%–15% water, 0.2%–0.5% polyurethane thickener, and 0.2%–0.5% UV stabilizer. The powder component, by weight percentage, comprises: 40%–50% white silicate cement, 2.5%–5% rapid-hardening sulfoaluminate cement, 15%–20% quartz sand, 10%–20% heavy calcium carbonate, and 15%–20% composite functional powder. The ratio of liquid to powder is 1:1.25–1.

5.

2. The liquid component of the exposed, fast-drying polymer cementitious waterproof coating according to claim 1, characterized in that, The environmentally friendly plasticizers, including dioctyl phthalate, silicone defoamer, bactericide, potassium salt dispersant, UV stabilizer, and polyurethane thickener, are all commercially available products.

3. The liquid component of the exposed, fast-drying polymer cementitious waterproof coating according to claim 1, characterized in that, The silane coupling agent is model KH-550.

4. The powder of the exposed, fast-drying polymer cementitious waterproof coating according to claim 1, characterized in that, The white silicate cement in the powder has a strength grade of PW 42.5, and the rapid-hardening sulfoaluminate cement is a commercially available product.

5. The powder of the exposed, fast-drying polymer cementitious waterproof coating according to claim 1, characterized in that, The fineness of the quartz sand in the powder is 200 mesh, and the fineness of the heavy calcium carbonate is 800 mesh.

6. The powder of the exposed, fast-drying polymer cementitious waterproof coating according to claim 1, characterized in that, The composite functional powder in the powder is a self-formulated anti-aging, acid and alkali resistant, and UV resistant powder with a fineness of 3000 mesh.

7. The exposed, fast-drying polymer cement waterproof coating and its preparation method according to claims 1-6, characterized in that, The preparation process of the exposed, fast-drying polymer cement waterproof coating is as follows: (1) The liquid preparation process is as follows: a. Add pure acrylic emulsion, low-temperature flexible styrene-acrylic emulsion and water to the liquid mixing tank, and control the stirring speed to 200~300 r / min and the stirring time to 10 min~20 min; b. Add bactericide, organosilicon defoamer, potassium salt dispersant, UV stabilizer and environmentally friendly plasticizer to the liquid mixing tank in sequence, and control the stirring speed to 300~400 r / min and the stirring time to 30~45 min; c. Add silane coupling agent, and control the stirring speed to 300~400 r / min and the stirring time to 30~45 min; d. Add polyurethane thickener, and control the stirring speed to 400~500 r / min and the stirring time to 10~20 min; e. Discharge and package to obtain a liquid of a quick-drying polymer cement waterproof coating that can be exposed. (2) The powder preparation process is as follows: a. Add white silicate cement, quartz sand and heavy calcium carbonate to the powder mixing tank in sequence, and control the stirring speed to 30~45 r / min and the stirring time to 25~45 min; b. Add rapid hardening sulfoaluminate cement, and control the stirring speed to 40~50 r / min and the stirring time to 30~40 min; c. Add composite functional powder, and control the stirring speed to 40~50 r / min and the stirring time to 20~30 min; d. Discharge and package to obtain a powder of a quick-drying polymer cement waterproof coating that can be exposed.

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