Negative delayed coagulation latex paint and preparation method thereof, and method for delayed coagulation and washing of exposed aggregate

Abstract

The invention belongs to the technical field of decorative concrete material surfaces, and provides a negative retarding latex paint, which comprises 60-90 parts of latex paint, 10-40 parts of a liquid retarder, 10-30 parts of water, 0.5-1.0 part of an anti-settling agent, and 1.0-2.0 parts of a surfactant. The emulsion paint and the retarder are arranged, the retarder can be evenly attached to the surface of the mold through the film forming matter in the emulsion paint, the phenomenon that due to the surface tension of the mold and the external effect, the retarder distribution thickness is uneven is avoided, and the technical effects that the washing depth is uniform, and the aggregate exposure effect is uniform are achieved.

Description

Technical Field

[0001] The invention relates to the field of decorative concrete material surfaces, in particular to a negative retarding latex paint and a preparation method thereof, and a retarding method for water-washed exposed aggregate. Background Art

[0002] Exposed aggregate concrete is a type of decorative concrete. During the prefabrication process, the finishing surface is not very flat and is not suitable for exposed aggregate decorative surface in terms of technology. The surface in contact with the mold is often used as the exposed aggregate decorative surface. Retarder is a special functional material that can prolong the setting and hardening time of cement in the contact area with it, and use a high-pressure water gun to wash the concrete surface to achieve an exposed aggregate effect. When using concrete retarder to make exposed aggregate decorative components, the retarder is generally applied to the surface of the mold, and after the component is demoulded, the surface in contact with the retarding coating is washed with pressurized water to form an exposed aggregate effect.

[0003] How to make the retarder evenly adhere to the mold surface and have a certain wear resistance is the key technology of the negative retarding exposed aggregate process of concrete. The mold surface tension refers to the intermolecular interaction force on the mold surface. The size of the mold surface tension determines the wettability of the mold surface and the distribution of the liquid on the mold surface.

[0004] In the prior art, the retarder is adhered to the mold surface through adhesives, binders and other materials to improve the stability of the exposed aggregate. For example, Chinese patent CN110256964A discloses a negative retarding coating for concrete and its preparation method, Chinese patent CN111848215A discloses a negative corrosion inhibitor capable of adjusting the washing depth of exposed aggregate concrete and its application, and Chinese patent CN104552557A discloses a method for preparing a glass fiber reinforced cement surface retarding material. In actual operation, due to changes in ambient temperature and humidity, mold changes or changes in dosage, and due to the surface tension of the mold, these methods cannot make the retarder adhere evenly to the mold surface. During the flushing process, some places are very deep, and some places cannot be flushed away, and a uniform retarding exposed aggregate decorative surface cannot be obtained. Especially when a complex mold has an inclined or vertical surface, sagging causes the lower surface retarder to be very thick, while the side retarder depth is not enough or even cannot be flushed away. Summary of the invention

[0005] The invention discloses a negative retarding latex paint and a preparation method thereof, and a retarding method for water-washed exposed aggregate, which are used to solve relevant technical problems in the background technology.

[0006] The technical solution provided by the present invention is as follows: a negative retarding latex paint, comprising: 60 to 90 parts of latex paint, 10 to 40 parts of liquid retarder, 10 to 30 parts of water, 0.5 to 1.0 parts of anti-settling agent, and 1.0 to 2.0 parts of surfactant.

[0007] In some embodiments, the retarder is one or more of sugars, phosphates, tartrates, gluconates, citric acid and salts thereof.

[0008] In some embodiments, the latex paint is one of polyvinyl acetate latex paint, ethylene propylene latex paint, and pure acrylic latex paint.

[0009] In some embodiments, the surfactant is one of stearic acid, sodium dodecylbenzene sulfonate, quaternary ammonium compounds, and lecithin.

[0010] In some embodiments, the anti-settling agent is one of polyolefin wax, polyamide wax, and methyl pyrrolidone solution.

[0011] A preparation method of a negative retarding latex paint comprises the following steps: taking 60-90 parts of latex paint, 10-40 parts of liquid retarder, 10-30 parts of water, 0.5-1.0 parts of anti-settling agent and 1.0-2.0 parts of surfactant, adding them into a disperser in sequence and mixing at a speed of 500-1000 r / min, using ultrasonic dispersion for 5-10 minutes to obtain the retarding latex paint, and controlling the temperature at 50-60 DEG C during mixing and dispersing.

[0012] A method for negative retarding setting with water-washed exposed aggregate, using the negative retarding setting latex paint prepared by the preparation method to perform retarding setting, comprising the following steps:

[0013] S1. Clean and dry the mold;

[0014] S2. Use the cross spraying method to spray the slow-setting latex paint twice, and control the spraying amount at 180g / m2 each time;

[0015] S3. Dry for 110 minutes in natural environment, and pour or spray concrete after latex paint forms film;

[0016] S4. After pouring for 18 hours, demould the concrete components after they reach the lifting strength, and then evenly wash the exposed aggregate parts with a high-pressure water gun. The water washing depth of the concrete surface is 0.2-3.0mm;

[0017] S5: After curing, an exposed aggregate concrete decorative component is obtained.

[0018] In some embodiments, the mold is one of a metal mold, a plastic mold, a wooden mold, and a silicone mold.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The negative retarding latex paint of the present invention, by setting latex paint and retarder, utilizes the film-forming substance in the latex paint to make the retarder evenly adhere to the mold surface, thereby solving the problem of uneven distribution thickness of the retarder caused by the surface tension of the mold and external effects, and achieving the technical effect of uniform water washing depth and uniform aggregate exposure effect.

[0021] (2) The negative retarding latex paint of the present invention can effectively control the retarding depth by setting the ratio of latex paint to retarder, thereby ensuring that the water washing depth of the concrete surface is 0.2 to 3.0 mm, thereby achieving a technical effect of high precision of the water washing depth.

[0022] (3) The preparation method of the negative retarding latex paint of the present invention uniformly disperses the retarder in the latex paint by ultrasonic dispersion. The ultrasonic dispersion technology can uniformly disperse the retarder in the latex paint, thereby avoiding the problem of uneven distribution of the retarder in the latex paint caused by uneven stirring. Due to the uniform distribution of the retarder in the latex paint, the consistency of the water washing depth is ensured, making the exposed aggregate effect more uniform.

[0023] (4) The negative retarding method combined with water-washing exposed aggregate of the present invention is to spray the retarding latex paint evenly on the mold surface, and the film-forming substance in the latex paint makes the retarder evenly adhere to the mold surface, thereby solving the problem of uneven distribution thickness of the retarder caused by the surface tension of the mold and external effects, and achieving the technical effect of uniform water washing depth and uniform exposed aggregate effect.

[0024] (5) The negative retarding method of the present invention is to spray the retarding latex paint twice by the cross spraying method, which can ensure the uniform coverage of the latex paint on the mold surface and avoid the problem of uneven coating thickness caused by single-direction spraying; by controlling the spraying amount at 180g / m 2 , which can ensure the consistency of coating thickness and achieve the best retarding effect. Since the coating thickness is uniform, the effect of the retarder is ensured, and ultimately the exposed aggregate effect is more uniform and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a rendering of a concrete decorative component obtained in Example 1 of the present invention;

[0026] Figure 2 This is a rendering of a concrete decorative component obtained in Example 2 of the present invention;

[0027] Figure 3 This is a rendering of the concrete decorative component prepared in Example 3 of the present invention. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] The present invention includes a negative retarding latex paint, including: 60 to 90 parts of latex paint, 10 to 40 parts of liquid retarder, 10 to 30 parts of water, 0.5 to 1.0 parts of anti-settling agent, and 1.0 to 2.0 parts of surfactant. By setting the latex paint and retarder, the retarder can be uniformly attached to the mold surface by using the film-forming substance in the latex paint, which solves the problem of uneven distribution thickness of the retarder caused by the surface tension of the mold and the external effect, and achieves the technical effect of uniform water washing depth and uniform exposed aggregate effect. By setting the ratio of latex paint to retarder, the retarding depth can be effectively controlled, ensuring that the water washing depth of the concrete surface is 0.2 to 3.0 mm, and achieving the technical effect of high precision of water washing depth.

[0030] The present invention includes a preparation method of the above-mentioned negative retarding latex paint, which includes the following steps: taking 60 to 90 parts of latex paint, 10 to 40 parts of liquid retarder, 10 to 30 parts of water, 0.5 to 1.0 parts of anti-settling agent, and 1.0 to 2.0 parts of surfactant, sequentially adding them into a disperser and mixing at a speed of 500 to 1000 r / min, using ultrasonic dispersion for 5 to 10 minutes to obtain retarding latex paint, and controlling the temperature at 50 to 60° C. during mixing and dispersion. The retarder is uniformly dispersed in the latex paint by ultrasonic dispersion, and the ultrasonic dispersion technology can uniformly disperse the retarder in the latex paint, avoiding the problem of uneven distribution of the retarder in the latex paint caused by uneven stirring. Due to the uniform distribution of the retarder in the latex paint, the consistency of the water washing depth is ensured, and the exposed aggregate effect is more uniform.

[0031] The present invention comprises: a method for negative retarding setting with water-washed exposed aggregate, wherein the negative retarding setting latex paint prepared by the above preparation method is used for retarding setting, and the method comprises the following steps:

[0032] S1. Clean and dry the mold;

[0033] S2. Use the cross spraying method to spray the slow-setting latex paint twice, and control the spraying amount at 180g / m2 each time;

[0034] S3. Dry for 110 minutes in natural environment, and pour or spray concrete after latex paint forms film;

[0035] S4. After pouring for 18 hours, demould the concrete components after they reach the lifting strength, and then evenly wash the exposed aggregate parts with a high-pressure water gun. The water washing depth of the concrete surface is 0.2-3.0mm;

[0036] S5: After curing, an exposed aggregate concrete decorative component is obtained.

[0037] The negative retarding method combined with water-washing exposed aggregate of the present invention sprays the retarding latex paint evenly on the mold surface, and the retarder is evenly attached to the mold surface through the film-forming substance in the latex paint, which solves the problem of uneven retarder distribution thickness caused by mold surface tension and external effects, and achieves the technical effect of uniform water washing depth and uniform exposed aggregate effect.

[0038] In this embodiment, the slow-setting latex paint is sprayed twice by the cross spraying method, which can ensure the uniform coverage of the latex paint on the mold surface and avoid the problem of uneven coating thickness caused by single-direction spraying; by controlling the spraying amount at 180g / m 2 , which can ensure the consistency of coating thickness and achieve the best retarding effect. Since the coating thickness is uniform, the effect of the retarder is ensured, and ultimately the exposed aggregate effect is more uniform and beautiful.

[0039] In the present embodiment, the latex paint is one of polyvinyl acetate latex paint, ethylene propylene latex paint, and pure acrylic latex paint.

[0040] In this embodiment, the retarder is one or more of sugars, phosphates, tartrates, gluconates, citric acid and salts thereof.

[0041] In this embodiment, the surfactant is one of stearic acid, sodium dodecylbenzene sulfonate, quaternary ammonium compound, and lecithin.

[0042] In this embodiment, the anti-settling agent is one of polyolefin wax, polyamide wax, and methyl pyrrolidone solution.

[0043] In the present embodiment, the mold is one of a metal mold, a plastic mold, a wooden mold, and a silicone mold.

[0044] In this embodiment, the selection of latex paint, retarder, anti-settling agent, and surfactant will not affect the effect of the negative retarded latex paint.

[0045] In this embodiment, the selection of the mold type will not affect the preparation of the negative retarding mixed water-washed exposed aggregate.

[0046] Example 1

[0047] S101: preparing a negative retarding latex paint: selecting 85 parts of latex paint, 15 parts of liquid retarder, 30 parts of water, 0.5 parts of anti-settling agent, and 1.0 parts of surfactant by weight, adding them into a disperser in sequence, rotating and mixing at a speed of 600 r / min, and using ultrasonic dispersion for 8 minutes to obtain a retarding latex paint, and controlling the temperature at 52° C. during mixing and dispersing;

[0048] S102: Clean the silicone mold to ensure that the surface of the silicone mold is dry and free of pollution;

[0049] S103: Use the automatic latex paint spray gun to spray the slow-setting latex paint twice using the cross spray method, and control the spraying amount at 120g / m 2 ;

[0050] S104: Dry for 80 minutes in natural environment, and pour or spray concrete after latex paint forms a film;

[0051] S105: After pouring for 20 hours, the concrete component is demoulded after reaching the lifting strength, and then the exposed aggregate part is evenly washed with a high-pressure water gun, and the water washing depth of the concrete surface is 0.3mm;

[0052] S106: After curing, a concrete decorative component with an exposed aggregate thickness of 0.2 mm is obtained. Figure 1 shown.

[0053] Example 2

[0054] S101: preparing a negative retarding latex paint: selecting 75 parts of latex paint, 25 parts of liquid retarder, 20 parts of water, 0.8 parts of anti-settling agent, and 1.5 parts of surfactant in parts by weight, adding them into a disperser in sequence at a speed of 800 r / min, using ultrasonic dispersion for 6 minutes to obtain a retarding latex paint, and controlling the temperature at 55° C. during mixing and dispersion;

[0055] S102: Clean the wooden mold and ensure that the surface of the wooden mold is dry and free of pollution;

[0056] S103: Use a latex paint automatic spray gun to spray slow-setting latex paint twice using a cross spray method, with the spraying amount each time controlled at 150g / m2;

[0057] S104: Dry for 100 minutes in natural environment, and pour or spray concrete after the latex paint forms a film;

[0058] S105: After pouring for 22 hours, the concrete components are demoulded after reaching the lifting strength, and then the exposed aggregate parts are evenly washed with a high-pressure water gun. The water washing depth of the concrete surface is 1.2mm;

[0059] S106: After curing, a concrete decorative component with an exposed aggregate thickness of 1.5 mm is obtained, such as Figure 2 shown.

[0060] Example 3

[0061] S1: preparing negative retarding latex paint: selecting 65 parts of latex paint, 35 parts of liquid retarder, 10 parts of water, 1.0 parts of anti-settling agent, and 1.8 parts of surfactant by weight, respectively, adding them into a disperser in sequence at a speed of 1000 r / min, using ultrasonic dispersion for 8 minutes to obtain retarding latex paint, and controlling the temperature at 58° C. during mixing and dispersing;

[0062] S102: Clean the steel mold to ensure that the surface of the steel mold is dry and free of pollution;

[0063] S103: Use a latex paint automatic spray gun to spray slow-setting latex paint twice using a cross spray method, with the spraying amount each time controlled at 180g / m2;

[0064] S104: Dry for 110 minutes in natural environment, and pour or spray concrete after latex paint forms a film;

[0065] S105: After pouring for 18 hours, demould the concrete components after they reach the lifting strength, and then evenly wash the exposed aggregate parts with a high-pressure water gun. The water washing depth of the concrete surface is 2.0mm;

[0066] S106: After curing, a concrete decorative component with an exposed aggregate thickness of 2.5 mm is obtained, such as Figure 3 shown.

[0067] from Figures 1 to 3 It can be seen that the present invention can effectively control the water washing depth of the concrete surface within the range of 0.2 to 3.0 mm by adjusting the ratio of latex paint to retarder, with high water washing depth accuracy, uniform water washing depth and uniform aggregate exposure effect.

[0068] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0069] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A negative slow-setting latex paint, characterized in that: include: 60-90 parts of latex paint, 10-40 parts of liquid retarder, 10-30 parts of water, 0.5-1.0 parts of anti-settling agent, and 1.0-2.0 parts of surfactant.

2. A negative slow-setting latex paint as claimed in claim 1, characterized in that: The retarder is composed of one or more of sugars, phosphates, tartrates, gluconates, citric acid and salts thereof.

3. A negative slow-setting latex paint as claimed in claim 1, characterized in that: The latex paint is one of polyvinyl acetate latex paint, ethylene propylene latex paint and pure acrylic latex paint.

4. A negative slow-setting latex paint as claimed in claim 1, characterized in that: The surfactant is one of stearic acid, sodium dodecylbenzene sulfonate, quaternary ammonium compound and lecithin.

5. A negative slow-setting latex paint as claimed in claim 1, characterized in that: The anti-settling agent is one of polyolefin wax, polyamide wax and methyl pyrrolidone solution.

6. A method for preparing a negative retarded latex paint as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: taking 60-90 parts of latex paint, 10-40 parts of liquid retarder, 10-30 parts of water, 0.5-1.0 parts of anti-settling agent and 1.0-2.0 parts of surfactant, adding them into a disperser in sequence, mixing at a rotation speed of 500-1000 r / min, using ultrasonic dispersion for 5-10 minutes to obtain retarded latex paint, and controlling the temperature at 50-60 DEG C during mixing and dispersing.

7. A method for negatively retarding and mixing water-washed exposed aggregate, characterized in that: The negative retarding latex paint prepared by the preparation method according to claim 6 is subjected to retarding, comprising the following steps: S1. Clean and dry the mold; S2. Use the cross spraying method to spray the slow-setting latex paint twice, and control the spraying amount at 180g / m 2 ; S3. Dry for 110 minutes in natural environment, and pour or spray concrete after latex paint forms film; S4. After pouring for 18 hours, demould the concrete components after they reach the lifting strength, and then evenly wash the exposed aggregate parts with a high-pressure water gun. The water washing depth of the concrete surface is 0.2-3.0mm; S5: After curing, an exposed aggregate concrete decorative component is obtained.

8. A method for negatively retarding and mixing water-washed exposed aggregate as claimed in claim 7, characterized in that: The mold is one of metal mold, plastic mold, wooden mold and silicone mold.

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