Decorative concrete containing photosensitive color-changing materials and its preparation method

Abstract

This application relates to the field of decorative concrete technology, specifically disclosing a decorative concrete containing a photosensitive color-changing material and its preparation method. The decorative concrete is mainly made from the following raw materials: water, cement, desulfurized gypsum, river sand, photosensitive color-changing material, auxiliary inorganic pigments, water-reducing agent, defoamer, expanding agent, polymer emulsion, polypropylene fiber, and calcium sulfate whiskers. The photosensitive color-changing material is obtained by sequentially coating the surface of river sand with an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer, followed by treatment with oleylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane. This decorative concrete, through the synergistic effect between the raw materials, not only has color but also changes color under visible or ultraviolet light, while also possessing high mechanical strength, meeting market demands.

Description

Technical Field

[0001] This application relates to the field of decorative concrete technology, and more specifically, to a decorative concrete containing a photosensitive color-changing material and a method for its preparation. Background Technology

[0002] Decorative concrete is made by adding design elements such as color, tone, texture, style, and pattern to ordinary concrete, and by combining patterns and colors to achieve a decorative effect. It is popular and widely used in construction.

[0003] The raw materials for decorative concrete generally include water, cement, sand, and water-reducing agents. To achieve different colors, some researchers directly add inorganic or organic pigments to the raw materials. However, in actual processing, the applicant found that while these methods can give decorative concrete color, the color is limited and it cannot change color under visible or ultraviolet light. Therefore, there is an urgent need to research a type of decorative concrete that can change color under visible or ultraviolet light. Summary of the Invention

[0004] In order to achieve color change of decorative concrete under visible or ultraviolet light irradiation, this application provides decorative concrete containing photosensitive color-changing materials and a preparation method thereof.

[0005] In one aspect, this application provides a decorative concrete containing photosensitive color-changing material, employing the following technical solution: A decorative concrete containing photosensitive color-changing material, mainly composed of the following raw materials in parts by weight: 30-35 parts water, 45-60 parts cement, 2-4 parts desulfurized gypsum, 230-270 parts river sand, 140-160 parts photosensitive color-changing material, 5-15 parts auxiliary inorganic pigment, 1-2 parts water-reducing agent, 0.1-0.3 parts defoamer, 0.5-1.5 parts expansion agent, 14-16 parts polymer emulsion, 2.5-3.5 parts polypropylene fiber, and 2.5-3.5 parts calcium sulfate whiskers;

[0006] The photosensitive color-changing material is obtained by sequentially coating the surface of river sand with an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer, followed by treatment with oleylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane.

[0007] By adopting the above technical solution, auxiliary inorganic pigments are added to the raw materials of decorative concrete, enabling the concrete to acquire color. Different colors of inorganic pigments can be selected to produce different colors in the decorative concrete. Photochromic materials are a type of photosensitive material that changes color when exposed to visible or ultraviolet light, and reverts to its original color when moved to darkness. Therefore, by adding photochromic materials to the raw materials of decorative concrete, the concrete can change color under visible or ultraviolet light, meeting market demand. Furthermore, through the synergistic effect between the raw materials, the decorative concrete exhibits advantages such as a 28-day compressive strength >47 MPa, a 28-day flexural strength >5 MPa, and an absorption rate <2.5%, demonstrating high mechanical strength and low absorption rate.

[0008] The photosensitive color-changing material of this application consists of an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer coated on the surface of river sand. The refractive index of titanium dioxide is 1.8-2.7, and the refractive index of silicon dioxide is 1.4-1.7. Light is refracted sequentially through three layers: the outer titanium dioxide layer, the silicon dioxide layer, and the inner titanium dioxide layer. This causes varying degrees of reflection and refraction on the surface of the photosensitive color-changing material, exhibiting photochromic characteristics. Furthermore, this allows decorative concrete to change color under visible or ultraviolet light. Additionally, oleoylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane are grafted onto the surface of the outer titanium dioxide layer. Oleylpropyl dimethyl betaine contains double bonds, imide groups, carboxylic acid anionic groups, and quaternary ammonium cationic groups, while vinyl-tris(2-methoxyethoxy)silane contains double bonds, ether groups, and siloxy groups. By utilizing the synergistic effect between the two, the active groups on the surface of the photosensitive color-changing material are increased, the bonding strength between the photosensitive color-changing material and the raw materials is improved, and the mechanical strength of decorative concrete is increased.

[0009] Simultaneously, polymer emulsions are added to the raw materials of decorative concrete. These emulsions lose moisture to form polymers, which then combine with the raw materials to create a network structure, increasing the bonding strength and reducing water absorption. Polypropylene fibers and calcium sulfate whiskers are also added to the raw materials. The polypropylene fibers are fibrous, and the calcium sulfate whiskers are needle-like; through the synergistic effect of these two components, the mechanical strength of the decorative concrete is enhanced.

[0010] Optionally, the photosensitive color-changing material is prepared using the following method:

[0011] T1. Prepare tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution, and tetrabutyl titanate ethanol solution b.

[0012] T2. Add river sand to nitric acid solution and mix. Heat to 30-50℃, then add tetrabutyl titanate ethanol solution a dropwise. After the addition is complete, stir for 2-4 hours, filter, and obtain single-layer coated river sand.

[0013] T3. Add a single layer of coated river sand to a nitric acid solution and mix. Heat the mixture to 50-70℃, then add an ethanol solution of tetraethyl orthosilicate dropwise. After the addition is complete, stir for 3-5 hours, filter, and obtain double-layer coated river sand.

[0014] T4. Add double-layer coated river sand to nitric acid solution and mix. Heat to 30-50℃, then add tetrabutyl titanate ethanol solution b dropwise. After the addition is complete, stir for 2-4 hours, filter, wash, and dry to obtain multi-layer coated river sand.

[0015] T5. Heat the multi-layer coated river sand to 600-700℃, keep it at that temperature for 1-3 hours, then cool it down to obtain the initial product.

[0016] T6. Add oleylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane to water and mix. Then add the initial product and stir for 1-3 hours. Then add ammonium persulfate and stir for 4-6 hours. Filter and dry to obtain the photosensitive color-changing material.

[0017] Optionally, the weight ratio of the river sand, tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution, tetrabutyl titanate ethanol solution b, oleylpropyl dimethyl betaine, and vinyl-tris(2-methoxyethoxy)silane is 1:(0.8-1.2):(0.8-1.2):(0.8-1.2):(0.2-0.4):(0.2-0.4), and the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution a is 7-13%; the mass concentration of tetraethyl orthosilicate in tetraethyl orthosilicate ethanol solution b is 7-13%; and the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution b is 13-17%.

[0018] By adopting the above technical solution, river sand is first added to a nitric acid solution, followed by the dropwise addition of tetrabutyl titanate ethanol solution a. The tetrabutyl titanate in tetrabutyl titanate ethanol solution a hydrolyzes upon contact with water and deposits on the surface of the river sand, forming a single-layer coating. Next, tetraethyl orthosilicate ethanol solution is added dropwise. The tetraethyl orthosilicate in tetraethyl orthosilicate ethanol solution hydrolyzes upon contact with water and deposits on the surface of the single-layer coated river sand, forming a double-layer coated river sand. Then, tetrabutyl titanate ethanol solution b is added dropwise. The tetrabutyl titanate in tetrabutyl titanate ethanol solution b hydrolyzes upon contact with water and deposits on the surface of the double-layer coated river sand, forming a multi-layer coated river sand. Further high-temperature treatment causes the surface of the river sand to be sequentially coated with an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer, obtaining the initial product. Subsequently, oleic acid acylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane are grafted onto the surface of the initial product and polymerized under the action of ammonium persulfate. This introduces imide groups, carboxylic acid anionic groups, quaternary ammonium cationic groups, ether groups, siloxy groups, etc., onto the surface of the photosensitive color-changing material, thereby enhancing the interaction between the photosensitive color-changing material and the raw materials and improving the performance of the photosensitive color-changing material.

[0019] In the preparation method of the photosensitive color-changing material of this application, nitric acid solution is used to lower the pH value of the reaction solution. Combined with the addition of tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution and tetrabutyl titanate ethanol solution b, the hydrolysis rate of tetrabutyl titanate and tetraethyl orthosilicate can be reduced, which facilitates the coating of the inner titanium dioxide layer, silicon dioxide layer and outer titanium dioxide layer, and increases the use effect of the photosensitive color-changing material.

[0020] Further, in step T2, the weight ratio of river sand to nitric acid solution is 1:(8-12), and the mass concentration of nitric acid in the nitric acid solution is 0.5-1%. Preferably, the weight ratio of river sand to nitric acid solution is 1:10, and the mass concentration of nitric acid in the nitric acid solution is 0.8%. In step T3, the weight ratio of river sand to nitric acid solution is 1:(8-12), and the mass concentration of nitric acid in the nitric acid solution is 0.5-1%. Preferably, the weight ratio of river sand to nitric acid solution is 1:10, and the mass concentration of nitric acid in the nitric acid solution is 0.8%. In step T4, the weight ratio of river sand to nitric acid solution is 1:(8-12), and the mass concentration of nitric acid in the nitric acid solution is 0.5-1%. Preferably, the weight ratio of river sand to nitric acid solution is 1:10, and the mass concentration of nitric acid in the nitric acid solution is 0.8%.

[0021] In step T6, the weight ratio of water, oleylpropyl dimethyl betaine, and ammonium persulfate is (80-120):(2-4):(0.05-0.15). Preferably, the weight ratio of water, oleylpropyl dimethyl betaine, and ammonium persulfate is 100:(2-4):0.1.

[0022] In several implementation schemes, in step T2, the heating temperature is 40°C and the stirring time is 3 hours. However, the heating temperature can be set to 30°C, 35°C, 45°C, 50°C, etc., and the stirring time can be set to 2 hours, 2.5 hours, 3.5 hours, 4 hours, etc., as needed.

[0023] In several implementation schemes, in step T3, the heating temperature is 60°C and the stirring time is 4 hours. However, the heating temperature can be set to 50°C, 55°C, 65°C, 70°C, etc., and the stirring time can be set to 3 hours, 3.5 hours, 4.5 hours, 5 hours, etc., as needed.

[0024] In several implementation schemes, in step T4, the heating temperature is 40°C and the stirring time is 3 hours. However, the heating temperature can be set to 30°C, 35°C, 45°C, 50°C, etc., and the stirring time can be set to 2 hours, 2.5 hours, 3.5 hours, 4 hours, etc., as needed.

[0025] In several implementation schemes, in step T5, the heating temperature is 650℃ and the heat treatment time is 2h. However, the heating temperature can also be set to 600℃, 620℃, 680℃, 700℃, etc., and the heat treatment time can be set to 1h, 1.5h, 2.5h, 3h, etc., as needed.

[0026] In several implementation schemes, in step T6, the stirring time for adding the initial product is 2 hours, and the stirring time for adding ammonium persulfate is 5 hours. Alternatively, the stirring time for adding the initial product can be set to 1 hour, 1.5 hours, 2.5 hours, 3 hours, etc., and the stirring time for adding ammonium persulfate can be set to 4 hours, 4.5 hours, 5.5 hours, 6 hours, etc., as needed.

[0027] Optionally, in step T1, the tetrabutyl titanate ethanol solution a is prepared by the following method: adding tetrabutyl titanate to ethanol and mixing to obtain tetrabutyl titanate ethanol solution a;

[0028] Tetraethyl orthosilicate ethanol solution is prepared by adding tetraethyl orthosilicate to ethanol and mixing to obtain tetraethyl orthosilicate ethanol solution;

[0029] Tetrabutyl titanate ethanol solution b is prepared by adding tetrabutyl titanate to ethanol and mixing to obtain tetrabutyl titanate ethanol solution b.

[0030] By adopting the above technical solution, it is convenient to prepare tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution and tetrabutyl titanate ethanol solution b.

[0031] Optionally, in step T2, the dropping time of tetrabutyl titanate ethanol solution a is 1-2 hours; in step T3, the dropping time of tetraethyl orthosilicate ethanol solution is 1-2 hours; and in step T4, the dropping time of tetrabutyl titanate ethanol solution b is 1-2 hours.

[0032] By adopting the above technical solution, tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution and tetrabutyl titanate ethanol solution b are all added dropwise, which facilitates the hydrolysis of tetrabutyl titanate and tetraethyl orthosilicate, and forms an inner titanium dioxide layer, a silicon dioxide layer and an outer titanium dioxide layer on the surface of river sand.

[0033] In several implementation schemes, in step T2, the dropping time of tetrabutyl titanate ethanol solution a is 1.5 hours, but it can also be set to 1 hour, 2 hours, etc., as needed. In step T3, the dropping time of tetraethyl orthosilicate ethanol solution is 1.5 hours, but it can also be set to 1 hour, 2 hours, etc., as needed. In step T4, the dropping time of tetrabutyl titanate ethanol solution b is 1.5 hours, but it can also be set to 1 hour, 2 hours, etc., as needed.

[0034] Optionally, the river sand has a continuous gradation of 0.15-0.35 mm particle size.

[0035] By adopting the above technical solution, the particle size of river sand is limited, which increases the density of decorative concrete and improves its mechanical strength and service life.

[0036] Optionally, the auxiliary inorganic pigment is one or more of ferric oxide, iron(II) oxide, copper oxide, and cobalt oxide.

[0037] By adopting the above technical solution, the auxiliary inorganic pigments are optimized, making it easier to select auxiliary inorganic pigments.

[0038] Optionally, the polymer emulsion is an acrylic polymer emulsion; the polypropylene fiber has an average length of 0.6-1.2 mm and an average diameter of 15-45 μm; and the calcium sulfate whiskers have an average length of 30-80 μm and an average diameter of 1-8 μm.

[0039] By adopting the above technical solution, the polymer emulsion is an acrylic polymer emulsion. The acrylic polymer emulsion loses water to form an acrylic polymer, increasing the interaction between the acrylic polymer and the polypropylene fibers. Furthermore, the length and diameter of the polypropylene fibers, as well as the length and diameter of the calcium sulfate whiskers, are optimized to enhance the synergistic effect between the two and improve the mechanical strength of the decorative concrete.

[0040] Optionally, the cement is white silicate cement; the water-reducing agent is polycarboxylate water-reducing agent; the defoamer is organosilicon defoamer; and the expanding agent is magnesium oxide expanding agent.

[0041] By adopting the above technical solutions, cement, water-reducing agents, defoamers, and expanding agents can be optimized, making it easier to select cement, water-reducing agents, defoamers, and expanding agents.

[0042] Secondly, this application provides a method for preparing decorative concrete containing photosensitive color-changing materials as described above, using the following technical solution:

[0043] A method for preparing decorative concrete containing photosensitive color-changing material as described above includes the following steps: mixing water, cement, desulfurized gypsum, river sand, photosensitive color-changing material, auxiliary inorganic pigments, water-reducing agent, defoamer, expanding agent, polymer emulsion, polypropylene fiber, and calcium sulfate whiskers to obtain decorative concrete.

[0044] By adopting the above technical solution, the processing and preparation of decorative concrete can be facilitated.

[0045] In summary, this application has at least the following beneficial effects:

[0046] 1. The decorative concrete of this application incorporates auxiliary inorganic pigments in the raw materials to give it color. Furthermore, a photosensitive color-changing material is added to the raw materials. This material consists of an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer coated on the surface of river sand. Due to the different refractive indices of titanium dioxide and silicon dioxide, three different refractive layers are formed on the river sand surface, exhibiting photosensitive color-changing characteristics. This allows the decorative concrete to change color under visible or ultraviolet light, meeting market demands.

[0047] 2. The photosensitive color-changing material of this application further grafts oleic acid acylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane onto the surface of the outer titanium dioxide layer, introducing imide groups, carboxylic acid anionic groups, quaternary ammonium cationic groups, ether groups, and siloxy groups onto the surface of the photosensitive color-changing material, thereby enhancing its bonding strength with the raw materials and improving the mechanical strength of the decorative concrete.

[0048] 3. The decorative concrete of this application also incorporates polymer emulsion into the raw materials, which, in conjunction with the interaction of cement and desulfurized gypsum, increases the bond strength between the raw materials. Furthermore, polypropylene fibers and calcium sulfate whiskers are added to the raw materials; the polypropylene fibers are fibrous, and the calcium sulfate whiskers are needle-like. Through the synergistic effect of these two components, the mechanical strength of the decorative concrete is further enhanced. Detailed Implementation

[0049] To make this application easier to understand, the following detailed description will be provided with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained commercially or by conventional methods.

[0050] Preparation Example

[0051] Preparation Example 1

[0052] A photosensitive color-changing material is prepared by the following method:

[0053] T1. Prepare tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution, and tetrabutyl titanate ethanol solution b.

[0054] In the tetrabutyl titanate ethanol solution a, the mass concentration of tetrabutyl titanate is 10%; in the tetraethyl orthosilicate ethanol solution, the mass concentration of tetraethyl orthosilicate is 10%; and in the tetrabutyl titanate ethanol solution b, the mass concentration of tetrabutyl titanate is 15%.

[0055] Furthermore, tetrabutyl titanate ethanol solution a is prepared by the following method: tetrabutyl titanate is added to ethanol and stirred for 10 min to obtain tetrabutyl titanate ethanol solution a.

[0056] The tetraethyl orthosilicate ethanol solution is prepared by adding tetraethyl orthosilicate to ethanol and stirring for 10 min to obtain the tetraethyl orthosilicate ethanol solution.

[0057] Tetrabutyl titanate ethanol solution b was prepared by adding tetrabutyl titanate to ethanol and stirring for 10 min to obtain tetrabutyl titanate ethanol solution b.

[0058] T2. Add 10 kg of river sand to 100 kg of nitric acid solution and stir for 10 min. Heat to 40 °C, then add 10 kg of tetrabutyl titanate ethanol solution a dropwise, completing the addition over 1.5 h. After the addition is complete, stir for 3 h. Filter to obtain a single-layer coated river sand.

[0059] The nitric acid solution contains 0.8% nitric acid by mass; the river sand has a continuous gradation of 0.15-0.35 mm particle size and a mud content of 1%.

[0060] T3. Add a single layer of coated river sand to 100 kg of nitric acid solution and stir for 10 min. Heat to 60 °C, then add 10 kg of tetraethyl orthosilicate ethanol solution dropwise over 1.5 h. After the addition is complete, stir for 4 h. Filter to obtain double-layer coated river sand.

[0061] The mass concentration of nitric acid in the nitric acid solution is 0.8%.

[0062] T4. Add double-layered coated river sand to 100 kg of nitric acid solution and stir for 10 min. Heat to 40 °C, then add 10 kg of tetrabutyl titanate ethanol solution b dropwise, completing the addition over 1.5 h. After the addition is complete, stir for 3 h. Filter, then wash three times with 30 kg of water each time. Finally, dry at 100 °C to obtain multi-layered coated river sand.

[0063] The mass concentration of nitric acid in the nitric acid solution is 0.8%.

[0064] T5. Heat the multi-layer coated river sand to 650℃, keep it at that temperature for 2 hours, and then cool it down to 25℃ to obtain the initial product.

[0065] T6. Add 3 kg of oleylpropyl dimethyl betaine and 3 kg of vinyl-tris(2-methoxyethoxy)silane to 100 kg of water and stir for 10 min. Then add the initial product and stir for 2 h. Then add 0.1 kg of ammonium persulfate and stir for 5 h. Filter. Then dry at 100℃ to obtain the photosensitive color-changing material.

[0066] Preparation Example 2

[0067] A photosensitive color-changing material, which differs from Preparation Example 1 in that, in step T1, the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution a is 7%; the mass concentration of tetrabutyl titanate in tetraethyl orthosilicate ethanol solution is 13%; and the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution b is 13%.

[0068] Furthermore, in step T2, the amount of tetrabutyl titanate ethanol solution a added is 12 kg; in step T3, the amount of tetraethyl orthosilicate ethanol solution a added is 8 kg; in step T4, the amount of tetrabutyl titanate ethanol solution b added is 12 kg; and in step T6, the amount of oleylpropyl dimethyl betaine used is 2 kg, and the amount of vinyl-tris(2-methoxyethoxy)silane used is 4 kg.

[0069] Preparation Example 3

[0070] A photosensitive color-changing material differs from Preparation Example 1 in that, in step T1, the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution a is 13%; the mass concentration of tetrabutyl titanate in tetraethyl orthosilicate ethanol solution is 7%; and the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution b is 17%.

[0071] Furthermore, in step T2, the amount of tetrabutyl titanate ethanol solution a added is 8 kg; in step T3, the amount of tetraethyl orthosilicate ethanol solution a added is 12 kg; in step T4, the amount of tetrabutyl titanate ethanol solution b added is 8 kg; and in step T6, the amount of oleylpropyl dimethyl betaine used is 4 kg, and the amount of vinyl-tris(2-methoxyethoxy)silane used is 2 kg.

[0072] Example

[0073] Table 1. Raw material content of decorative concrete (unit: kg)

[0074]

[0075]

[0076] Example 1

[0077] A decorative concrete containing photosensitive color-changing materials, the raw materials and their proportions are shown in Table 1.

[0078] The cement is white silicate cement, specifically white silicate cement PW42.5; the desulfurized gypsum is selected from Hebei Runri Mineral Products Co., Ltd.; the river sand has a particle size of 0.15-0.35mm continuous gradation and a mud content of 1%; the auxiliary inorganic pigment is ferric oxide; the water-reducing agent is polycarboxylate water-reducing agent, specifically polycarboxylate water-reducing agent AN4000; the defoamer is organosilicon defoamer, specifically organosilicon defoamer AT930; and the expanding agent is magnesium oxide expanding agent, specifically magnesium oxide expanding agent T60A.

[0079] The polymer emulsion is an acrylic polymer emulsion, specifically acrylic polymer emulsion LEAC-21; the polypropylene fibers have an average length of 1 mm and an average diameter of 30 μm, and are selected from Taian Tongban Fiber Co., Ltd.; the calcium sulfate whiskers have an average length of 50 μm and an average diameter of 5 μm; the photosensitive color-changing material was prepared using Preparation Example 1.

[0080] A method for preparing decorative concrete containing photosensitive color-changing materials includes the following steps:

[0081] Add photosensitive color-changing material to river sand and stir for 5 minutes. Then add cement, desulfurized gypsum, expanding agent, and auxiliary inorganic pigments, and stir for 5 minutes. Next, add polypropylene fiber and calcium sulfate whiskers, and stir for 5 minutes. Finally, add water, water-reducing agent, defoamer, and polymer emulsion, and stir for 10 minutes to obtain decorative concrete.

[0082] Example 2

[0083] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that the raw material ratio of the decorative concrete is different, and the raw material ratio of the decorative concrete is shown in Table 1.

[0084] Example 3

[0085] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that the raw material ratio of the decorative concrete is different, and the raw material ratio of the decorative concrete is shown in Table 1.

[0086] Example 4

[0087] A decorative concrete containing a photosensitive color-changing material differs from Example 1 in that the source of the photosensitive color-changing material is different, and the photosensitive color-changing material is prepared using Preparation Example 2.

[0088] Example 5

[0089] A decorative concrete containing a photosensitive color-changing material differs from Example 1 in that the source of the photosensitive color-changing material is different, and the photosensitive color-changing material is prepared using Preparation Example 3.

[0090] Comparative Example

[0091] Comparative Example 1

[0092] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that the photosensitive color-changing material is replaced with an equal amount of river sand in the raw materials of the decorative concrete, and the river sand has a particle size of 0.15-0.35mm continuous gradation and a mud content of 1%.

[0093] Comparative Example 2

[0094] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that, in the preparation method of the photosensitive color-changing material of the decorative concrete raw material, in step T6, oleoylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane are replaced with an equal amount of water.

[0095] Comparative Example 3

[0096] A decorative concrete containing a photosensitive color-changing material differs from Example 1 in that, in step T6 of the method for preparing the photosensitive color-changing material of the decorative concrete raw material, vinyl-tris(2-methoxyethoxy)silane is replaced with an equal amount of oleylpropyl dimethyl betaine.

[0097] Comparative Example 4

[0098] A decorative concrete containing a photosensitive color-changing material differs from Example 1 in that, in step T6 of the method for preparing the photosensitive color-changing material of the decorative concrete raw material, oleic acid acylpropyl dimethyl betaine is replaced with an equal amount of vinyl-tris(2-methoxyethoxy)silane.

[0099] Comparative Example 5

[0100] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that, in the raw materials of the decorative concrete, an equal amount of polypropylene fibers replace calcium sulfate whiskers.

[0101] Comparative Example 6

[0102] A decorative concrete containing photosensitive color-changing material differs from Example 1 in that an equal amount of calcium sulfate whiskers replaces polypropylene fibers in the raw materials of the decorative concrete.

[0103] Performance testing

[0104] Decorative concrete samples obtained in Examples 1-5 and Comparative Examples 1-6 were taken as specimens, and the following performance tests were performed on the specimens. The test results are shown in Table 2.

[0105] In accordance with GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the 28-day compressive strength and 28-day flexural strength of the specimens were tested.

[0106] The following method is used to determine the color change of ultraviolet light: Irradiate the sample under ultraviolet light for 3 minutes, and observe and compare whether the color of the sample changes.

[0107] The visible light color change is determined by the following method: Irradiate the sample under visible light for 10 minutes, and observe and compare whether the sample color changes.

[0108] The water absorption rate was determined by the following method: the sample was immersed in water and left to stand for 10 minutes. The weight of the sample before and after immersion was measured, and the water absorption rate was calculated.

[0109] Table 2 Detection Results

[0110]

[0111] As shown in Table 2, the decorative concrete of this application can change color under ultraviolet or visible light irradiation, and restore its original color when moved to the dark. Furthermore, it exhibits high 28-day compressive strength and 28-day flexural strength, with a 28-day compressive strength of 47.6-49.3 MPa and a 28-day flexural strength of 5.4-5.7 MPa, demonstrating high mechanical strength and meeting market demands.

[0112] The photochromic material in Comparative Example 2 was not organically modified; the photochromic material in Comparative Example 3 was treated with oleylpropyl dimethyl betaine; the photochromic material in Comparative Example 4 was treated with vinyl-tris(2-methoxyethoxy)silane; and the photochromic material in Example 13 was treated with both oleylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane. This demonstrates that treatment with oleylpropyl dimethyl betaine and vinyl-tris(2-methoxyethoxy)silane in the preparation of photochromic materials can introduce a large number of active groups onto their surface, increasing the bonding strength between the photochromic material and the raw materials, and enhancing the compressive and flexural strength of the photochromic material.

[0113] In Comparative Example 5, polypropylene fibers were added to the decorative concrete; in Comparative Example 6, calcium sulfate whiskers were added to the decorative concrete; and in Example 1, both polypropylene fibers and calcium sulfate whiskers were added to the decorative concrete. This demonstrates that simultaneously adding polypropylene fibers and calcium sulfate whiskers to the raw materials of decorative concrete, and utilizing their synergistic effect, can further enhance the mechanical strength of the decorative concrete, resulting in superior overall performance.

[0114] It should be noted that the embodiments described above are only for explaining this application and do not constitute any limitation on this application. This application has been described with reference to typical embodiments, but it should be understood that the terms used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to this application within the scope of the claims, and revisions can be made to the invention without departing from the scope and spirit of this application. Although the application described herein relates to specific methods, materials, and embodiments, it does not mean that this application is limited to the specific examples disclosed herein; on the contrary, this application can be extended to all other methods and applications with the same function.

Claims

1. Decorative concrete containing a photosensitive color-changing material, characterized in that: It is mainly made of the following raw materials by weight: water 30-35 parts, cement 45-60 parts, desulfurization gypsum 2-4 parts, river sand 230-270 parts, photosensitive color-changing material 140-160 parts, auxiliary inorganic pigment 5-15 parts, water reducing agent 1-2 parts, defoaming agent 0.1-0.3 parts, expanding agent 0.5-1.5 parts, polymer emulsion 14-16 parts, polypropylene fiber 2.5-3.5 parts, calcium sulfate whisker 2.5-3.5 parts; The photosensitive color-changing material is obtained by sequentially coating the surface of river sand with an inner titanium dioxide layer, a silicon dioxide layer, and an outer titanium dioxide layer, and then treating with oleic acid acyl propyl dimethyl betaine and vinyl-tris(2-methoxyethoxy) silane; The photosensitive color-changing material is prepared by the following method: T1, prepare a tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution, tetrabutyl titanate ethanol solution b; T2, add river sand to nitric acid solution and mix, heat to 30-50 DEG C, then drop tetrabutyl titanate ethanol solution a, after drop completion, stir for 2-4 h, filter, obtain single layer coated river sand; T3, add single layer coated river sand to nitric acid solution and mix, heat to 50-70 DEG C, then drop tetraethyl orthosilicate ethanol solution, after drop completion, stir for 3-5 h, filter, obtain double layer coated river sand; T4, add double layer coated river sand to nitric acid solution and mix, heat to 30-50 DEG C, then drop tetrabutyl titanate ethanol solution b, after drop completion, stir for 2-4 h, filter, wash, dry, obtain multi-layer coated river sand; T5, heat multi-layer coated river sand to 600-700 DEG C, heat treatment for 1-3 h, cool, obtain preliminary product; T6, add oleic acid acyl propyl dimethyl betaine and vinyl-tris(2-methoxyethoxy) silane to water and mix, then add preliminary product, stir for 1-3 h, then add ammonium persulfate, stir for 4-6 h, filter, dry, obtain photosensitive color-changing material.

2. A decorative concrete containing a photosensitive color-changing material according to claim 1, characterized by: The weight ratio of river sand, tetrabutyl titanate ethanol solution a, tetraethyl orthosilicate ethanol solution, tetrabutyl titanate ethanol solution b, oleic acid acyl propyl dimethyl betaine, and vinyl-tris(2-methoxyethoxy) silane is 1:(0.8-1.2):(0.8-1.2):(0.8-1.2):(0.2-0.4):(0.2-0.4), and the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution a is 7-13%; the mass concentration of tetraethyl orthosilicate in tetraethyl orthosilicate ethanol solution is 7-13%; the mass concentration of tetrabutyl titanate in tetrabutyl titanate ethanol solution b is 13-17%.

3. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: In step T1, tetrabutyl titanate ethanol solution a is prepared by the following method: add tetrabutyl titanate to ethanol and mix, obtain tetrabutyl titanate ethanol solution a; Tetraethyl orthosilicate ethanol solution is prepared by the following method: add tetraethyl orthosilicate to ethanol and mix, obtain tetraethyl orthosilicate ethanol solution; Tetrabutyl titanate ethanol solution b is prepared by the following method: add tetrabutyl titanate to ethanol and mix, obtain tetrabutyl titanate ethanol solution b.

4. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: The dropping time of the tetrabutyl titanate ethanol solution a in step T2 is 1-2 h; the dropping time of the ethyl silicate ethanol solution in step T3 is 1-2 h; and the dropping time of the tetrabutyl titanate ethanol solution b in step T4 is 1-2 h.

5. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: The particle size of the river sand is 0.15-0.35 mm continuous gradation.

6. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: The auxiliary inorganic pigment is one or more of ferric oxide, magnetite, copper oxide and cobalt oxide.

7. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: The polymer emulsion is an acrylic polymer emulsion; the average length of the polypropylene fiber is 0.6-1.2 mm, and the average diameter is 15-45 μm; and the average length of the calcium sulfate whisker is 30-80 μm, and the average diameter is 1-8 μm.

8. The decorative concrete containing a photosensitive color change material according to claim 1, characterized by: The cement is white Portland cement; the water reducing agent is a polycarboxylic acid water reducing agent; the defoaming agent is a silicone defoaming agent; and the expanding agent is a magnesium oxide expanding agent.

9. A method for the production of decorative concrete containing a photosensitive chromic material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing water, cement, desulfurized gypsum, river sand, a photosensitive color-changing material, an auxiliary inorganic pigment, a water reducing agent, a defoaming agent, an expanding agent, a polymer emulsion, polypropylene fiber and calcium sulfate whisker to obtain decorative concrete.

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