Green and environment-friendly real stone paint taking desert sand as aggregate and preparation method of green and environment-friendly real stone paint

Abstract

The invention discloses a green environment-friendly real stone paint taking desert sand as aggregate and a preparation method thereof. The green environment-friendly real stone paint taking desert sand as aggregate is prepared from the following raw materials in parts by weight: 150-200 parts of silicone acrylic emulsion; 400 to 500 parts of colored modified desert sand; 50 to 100 parts of auxiliary aggregate; 2-4 parts of a thickening agent; 8-12 parts of a coalescing agent; 1-2 parts of a preservative; the colored modified desert sand is desert sand which is subjected to surface activation treatment and high-temperature sintering coloring; through modification treatment of desert sand and collaborative optimization of a formula and a process, the green environment-friendly real stone paint which is stable in color, high in adhesive force and excellent in weather resistance is successfully prepared, the problems that desert sand resources in a desert area are idle and wasted and traditional real stone paint aggregates exist are solved, high-value utilization of solid waste resources is achieved, and the environment-friendly real stone paint is suitable for large-scale popularization and application. The composite material has remarkable economic value, social value and environmental protection value, and has a wide application prospect in the field of building outer wall decoration materials.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, specifically to a green and environmentally friendly stone-like paint using desert sand as aggregate and its preparation method. Background Technology

[0002] Stone-like paint, a thick architectural coating that closely resembles natural stone in its decorative effect, is widely used in building exterior wall decoration projects due to its aesthetic appeal, strong texture, and good weather resistance. Traditional stone-like paint primarily uses natural or dyed colored sand as aggregate. However, natural colored sand resources are limited, and over-exploitation can severely damage the ecological environment; furthermore, its extraction and transportation costs are high. Dyed colored sand, on the other hand, generally suffers from poor colorfastness, easy fading, and weak adhesion to the emulsion, leading to problems such as peeling and discoloration of the stone-like paint coating during use, affecting the building's decorative effect and service life.

[0003] Desert sand is abundant globally, but its color is monotonous, mostly yellowish-brown, with a smooth surface and chemical inertness. This results in poor interfacial compatibility and weak adhesion with paint emulsions. When used directly as aggregate in stone-like paint, it leads to insufficient paint film adhesion, easy cracking and peeling. Furthermore, it cannot meet the diverse color requirements of architectural decoration. Therefore, it has long been underutilized. How to modify desert sand through technical means to solve its problems of monotonous color and insufficient adhesion, transforming it into a high-performance aggregate for stone-like paint, and realizing the resource-based and high-value utilization of desert sand, while simultaneously reducing the production cost of stone-like paint and mitigating the environmental damage caused by the mining of natural colored sand, has become an urgent technical challenge in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a green and environmentally friendly stone paint with desert sand as aggregate and its preparation method. By performing special modification treatment on desert sand, the problems of desert sand's single color and weak adhesion to emulsion are solved, and an environmentally friendly stone paint with stable color, strong adhesion and excellent weather resistance is prepared, realizing the high-value application of desert sand in high-end architectural coatings.

[0005] This invention is implemented as follows:

[0006] According to a first aspect of the present invention, the present invention provides a green and environmentally friendly stone-like paint using desert sand as aggregate, which is made from the following raw materials in parts by weight:

[0007] 150-200 parts of silicone-acrylic emulsion;

[0008] Colored modified desert sand, 400-500 parts;

[0009] 50-100 parts of auxiliary aggregate;

[0010] Thickener 2-4 parts;

[0011] 8-12 parts of film-forming aid;

[0012] 1-2 parts preservative;

[0013] 100-150 parts water.

[0014] The colored modified desert sand is desert sand that has undergone surface activation treatment and high-temperature sintering for coloring. Its particle size range is 20-80 mesh. Desert sand within this particle size range can ensure that the real stone paint coating has good texture and breathability.

[0015] Furthermore, the preparation method of the color-modified desert sand includes the following steps:

[0016] a. Pretreatment: First, the raw desert sand is washed with water to remove the dust and soluble impurities attached to the surface, then acid washed, then washed with clean water until the pH value is neutral, and finally dried.

[0017] b. Surface activation treatment: The pretreated desert sand is soaked in a silane coupling agent solution and then dried;

[0018] c. Coloring treatment: The surface-activated desert sand is mixed with inorganic mineral pigments and sintered at 800-900℃ for 1-2 hours. The pigments are firmly bonded to the desert sand particles through high-temperature sintering. After cooling, the colored modified desert sand is obtained.

[0019] Furthermore, the silane coupling agent is KH-560, with a solution concentration of 1-2%. This type of silane coupling agent can effectively improve the surface activity of desert sand and enhance its adhesion to the emulsion.

[0020] Furthermore, the inorganic mineral pigment is an iron oxide pigment (such as iron oxide red, iron oxide yellow, iron oxide black, etc.), and its dosage is 3%-5% of the desert sand mass. Iron oxide pigments have the advantages of bright color, strong weather resistance, and stable chemical properties, which can ensure the long-lasting color of the real stone paint coating.

[0021] Furthermore, in step a, the pickling involves soaking the desert sand in 5%-10% dilute hydrochloric acid for 2-4 hours, which can effectively remove harmful impurities such as iron oxides and carbonates from the surface of the desert sand. The drying temperature is 105±5℃, which can completely remove the moisture from the desert sand and avoid affecting the subsequent modification effect. In step b, the soaking time for surface activation is 1-2 hours to ensure that the silane coupling agent can fully adhere to the surface of the desert sand to form an activation layer.

[0022] Furthermore, the auxiliary aggregate is 40-120 mesh white quartz sand or marble powder. Adding auxiliary aggregate can adjust the texture and color gradation of the real stone paint, making the decorative effect closer to natural stone.

[0023] Furthermore, the thickener is hydroxyethyl cellulose, which can effectively adjust the viscosity of the stone paint, prevent aggregate settling, and ensure the storage stability and application performance of the coating.

[0024] Furthermore, the film-forming aid is 12-ol ester, which can lower the minimum film-forming temperature of silicone-acrylic emulsion, promote the formation of a continuous and dense paint film on the substrate surface, and improve the integrity and durability of the coating.

[0025] Furthermore, the preservative is an isothiazolinone preservative, which can effectively inhibit the growth and reproduction of microorganisms during the storage and use of the coating, and extend the shelf life of the coating.

[0026] According to a second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned green and environmentally friendly stone paint using desert sand as aggregate, comprising the following steps:

[0027] S100. Mix water, thickener, preservative, and film-forming aid evenly. S200. Add silicone-acrylic emulsion and mix evenly. S300. Slowly add color-modified desert sand and auxiliary aggregates, and stir until all aggregates are evenly coated with the slurry to obtain the finished stone paint.

[0028] Furthermore, the stirring in steps S100-S300 is all done at low speed, which means the stirring speed is 350-500 rpm. This stirring speed can ensure that the components are fully mixed, and can also avoid excessive bubbles caused by excessive stirring speed, which would affect the coating quality. In step S200, the stirring time is 5-10 minutes to ensure that the silicone-acrylic emulsion is fully integrated with other components. In step S300, the stirring time is 10-15 minutes to ensure that all aggregates are completely and uniformly coated by the emulsion slurry without agglomeration.

[0029] Compared with existing technologies, the beneficial effects of this invention are as follows: Through the modification treatment of desert sand and the synergistic optimization of formula and process, this invention successfully prepares a green and environmentally friendly real stone paint with stable color, strong adhesion, and excellent weather resistance. It not only solves the problems of idle and wasteful desert sand resources in desert areas and the many problems existing in traditional real stone paint aggregates, but also realizes the high-value utilization of solid waste resources. It has significant economic, social and environmental value and has broad application prospects in the field of building exterior wall decoration materials. Attached Figure Description

[0030] Figure 1 This is a process flow diagram of the preparation of color-modified desert sand in Example 1;

[0031] Figure 2 This is a process flow diagram of the preparation process of the green and environmentally friendly real stone paint using desert sand as aggregate in Example 1;

[0032] Figure 3 This is a flow chart of the preparation process of the color-modified desert sand in Example 2;

[0033] Figure 4 This is a process flow diagram of the preparation of green and environmentally friendly real stone paint using desert sand as aggregate in Example 2;

[0034] Figure 5 This is a process flow diagram of the preparation of color-modified desert sand in Example 3;

[0035] Figure 6 This is a process flow diagram of the preparation process of the green and environmentally friendly real stone paint using desert sand as aggregate in Example 3. Detailed Implementation

[0036] Example 1

[0037] This embodiment provides a desert sand-like stone paint with a granite-like effect, and its raw material formula is as follows (parts by weight):

[0038] Silicone-acrylic emulsion: 180 parts;

[0039] Colored modified desert sand (20-40 mesh): 450 parts;

[0040] Auxiliary aggregate (80-120 mesh white quartz sand): 80 parts;

[0041] Thickener (hydroxyethyl cellulose): 3 parts;

[0042] Film-forming aid (alcohol ester dodecyl): 10 parts;

[0043] Preservatives (isothiazolinones): 1.5 parts;

[0044] Water: 130 portions.

[0045] The preparation process is as follows:

[0046] like Figure 1 As shown, colored modified desert sand is prepared:

[0047] a. Pretreatment: Take desert sand raw material, first wash it with water to remove impurities, then soak it in 5% dilute hydrochloric acid for 4 hours, then wash it with clean water until pH=7, and dry it at 105℃;

[0048] b. Surface activation treatment: Immerse the dried desert sand in a 1.5% KH-560 silane coupling agent ethanol solution for 1.5 hours, then remove and dry.

[0049] c. Coloring treatment: Take 100 parts of activated desert sand, mix it evenly with 4 parts of iron oxide black and 1 part of iron oxide yellow, sinter at 850℃ for 1.5 hours, and obtain black-toned colored modified desert sand after cooling.

[0050] like Figure 2 As shown, a desert sand-like stone paint with a granite-like effect is prepared:

[0051] S100. Add 130 parts water, 3 parts hydroxyethyl cellulose, 1.5 parts preservative, and 10 parts alcohol ester dodecyl to a dispersion tank and stir at low speed of 350 rpm until uniformly dispersed.

[0052] S200, add 180 parts of silicone-acrylic emulsion, and continue to stir at low speed of 350 rpm for 5 minutes to form a uniform emulsion mixture;

[0053] S300: Slowly add 450 parts of black-toned modified desert sand and 80 parts of white quartz sand, and stir at 350 rpm for 12 minutes until the aggregate is completely coated to obtain the finished stone paint product.

[0054] Performance test results: The adhesion (cross-cut test) of the stone paint coating is grade 0, the water resistance (96h) is normal, the alkali resistance (48h) is normal, the stain resistance (5 cycles) is ≤15%, the decorative effect is very similar to natural granite, and all performance indicators are better than the national standard requirements.

[0055] Example 2

[0056] This embodiment provides a beige desert sand-like stone paint, the raw material formula of which is as follows (parts by weight):

[0057] Silicone-acrylic emulsion: 160 parts;

[0058] Colored modified desert sand (40-80 mesh): 420 parts;

[0059] Auxiliary aggregate (40-70 mesh marble powder): 70 parts;

[0060] Thickener (hydroxyethyl cellulose): 2.5 parts;

[0061] Film-forming aid (alcohol ester dodecyl): 9 parts;

[0062] Preservatives (isothiazolinones): 1.0 part;

[0063] Water: 110 portions.

[0064] The preparation process is as follows:

[0065] like Figure 3 As shown, colored modified desert sand is prepared:

[0066] a. Pretreatment: Take desert sand raw material, wash it with water, soak it in 8% dilute hydrochloric acid for 2.5 hours, wash it with clean water until pH=7, and dry it at 110℃;

[0067] b. Surface activation treatment: Immerse the dried desert sand in a 1% KH-560 silane coupling agent ethanol solution for 2 hours, then remove and dry it.

[0068] c. Coloring treatment: Take 100 parts of activated desert sand and mix it evenly with 3.5 parts of iron oxide yellow. Sinter at 800℃ for 2 hours and obtain beige colored modified desert sand after cooling.

[0069] like Figure 4 As shown, a beige desert sand-like stone paint is prepared:

[0070] S100. Add 110 parts water, 2.5 parts hydroxyethyl cellulose, 1.0 part preservative, and 9 parts alcohol ester dodecyl to a dispersion tank and stir at low speed of 400 rpm until uniformly dispersed.

[0071] S200, add 160 parts of silicone-acrylic emulsion, and continue stirring at low speed of 400 rpm for 6 minutes to form a uniform emulsion mixture;

[0072] S300: Slowly add 420 parts of beige-colored modified desert sand and 70 parts of marble powder, and stir at 400 rpm for 10 minutes until the aggregate is completely coated to obtain the finished stone paint product.

[0073] Performance test results: The stone-like paint coating has a delicate texture and uniform color. The adhesion (cross-cut test) is grade 1. The water resistance (96h) and alkali resistance (48h) are normal. The stain resistance (5 cycles) is ≤12%. All performance indicators meet or exceed the national standards for exterior wall stone-like paint.

[0074] Example 3

[0075] This embodiment provides a reddish-brown desert sand-like stone paint, the raw material formula of which is as follows (parts by weight):

[0076] Silicone-acrylic emulsion: 200 parts;

[0077] Colored modified desert sand (30-60 mesh): 480 parts;

[0078] Auxiliary aggregate (60-100 mesh white quartz sand): 90 parts;

[0079] Thickener (hydroxyethyl cellulose): 4 parts;

[0080] Film-forming aid (alcohol ester dodecyl): 12 parts;

[0081] Preservative (isothiazolinone): 2 parts;

[0082] Water: 150 portions.

[0083] The preparation process is as follows:

[0084] like Figure 5 As shown, colored modified desert sand is prepared:

[0085] a. Pretreatment: Take desert sand raw material, wash it with water, soak it in 10% dilute hydrochloric acid for 2 hours, wash it with clean water until pH=7, and dry it at 108℃;

[0086] b. Surface activation treatment: Immerse the dried desert sand in a 2% KH-560 silane coupling agent ethanol solution for 1 hour, then remove and dry.

[0087] c. Coloring treatment: Take 100 parts of activated desert sand, mix it evenly with 5 parts of iron oxide red, sinter at 900℃ for 1 hour, and obtain reddish-brown colored modified desert sand after cooling.

[0088] like Figure 6 As shown, a reddish-brown desert sand-like stone paint is prepared:

[0089] S100. Add 150 parts water, 4 parts hydroxyethyl cellulose, 2 parts preservative, and 12 parts dodecyl alcohol ester to a dispersion tank and stir at low speed of 500 rpm until uniformly dispersed.

[0090] S200, add 200 parts of silicone-acrylic emulsion, and continue stirring at low speed of 500 rpm for 10 minutes to form a uniform emulsion mixture;

[0091] S300: Slowly add 480 parts of reddish-brown colored modified desert sand and 90 parts of white quartz sand, and stir at 500 rpm for 15 minutes until the aggregate is completely coated to obtain the finished stone paint.

[0092] Performance test results: The real stone paint coating has rich color and strong texture. The adhesion (cross-cut test) is grade 0. The water resistance (96h) and alkali resistance (48h) are normal. The stain resistance (5 cycles) is ≤10%. The overall performance is excellent.

[0093] This invention has the following technical advantages:

[0094] 1. High-value utilization of resources: This invention transforms abundant desert sand with extremely low utilization rate into high-performance stone paint aggregate, realizing "turning waste into treasure". It not only reduces the raw material cost of stone paint, but also reduces the ecological damage caused by the mining of natural colored sand, and has significant economic value and environmental benefits.

[0095] 2. Stable and long-lasting color: Through high-temperature sintering coloring technology, inorganic mineral pigments are firmly bonded to the desert sand particles, avoiding the problems of easy fading and discoloration of traditional dyed sand. The prepared stone paint coating has uniform color, high color fastness, excellent weather resistance, and is not easy to change color with long-term use.

[0096] 3. Excellent adhesion performance: The surface activation treatment with silane coupling agent improves the surface activity and interfacial compatibility of desert sand, which greatly enhances its adhesion to silicone acrylic emulsion. The prepared stone paint coating has strong adhesion, is not prone to cracking or peeling, and has significantly improved durability.

[0097] 4. Excellent environmental performance: The raw materials used in this invention are all environmentally friendly, and there is no emission of toxic or harmful substances during the production process. It also reduces the consumption of natural resources and is in line with the concept of green building development.

[0098] 5. Simple preparation process: The preparation method of the present invention has simple steps, and the required equipment are all conventional equipment in the field of architectural coating production. The process parameters such as stirring speed and time are easy to control, which is conducive to large-scale production.

[0099] In summary, this invention, through the modification of desert sand and the synergistic optimization of formulation and process, successfully prepared a green and environmentally friendly stone-like paint with stable color, strong adhesion, and excellent weather resistance. This not only solves the problems of idle and wasteful desert sand resources in desert areas and the many problems existing in traditional stone-like paint aggregates, but also realizes the high-value utilization of solid waste resources. It has significant economic, social, and environmental value and has broad application prospects in the field of building exterior wall decoration materials.

[0100] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A green and environmentally friendly stone-like paint using desert sand as aggregate, characterized in that, Made from the following raw materials in parts by weight: 150-200 parts of silicone-acrylic emulsion; Colored modified desert sand, 400-500 parts; 50-100 parts of auxiliary aggregate; Thickener 2-4 parts; 8-12 parts of film-forming aid; 1-2 parts preservative; 100-150 parts water; The colored modified desert sand is desert sand that has undergone surface activation treatment and high-temperature sintering for coloring, and its particle size ranges from 20 to 80 mesh.

2. The green and environmentally friendly stone-like paint using desert sand as aggregate as described in claim 1, characterized in that, The preparation method of the color-modified desert sand includes the following steps: a. Pretreatment: First, the raw desert sand is washed with water and acid, then washed until neutral, and finally dried. b. Surface activation treatment: The pretreated desert sand is soaked in a silane coupling agent solution and then dried; c. Coloring treatment: Mix the surface-activated desert sand with inorganic mineral pigments and sinter at 800-900℃ for 1-2 hours.

3. The green and environmentally friendly stone-like paint using desert sand as aggregate as described in claim 2, characterized in that, The silane coupling agent is KH-560, and its solution concentration is 1-2%.

4. The green and environmentally friendly stone-like paint using desert sand as aggregate as described in claim 2, characterized in that, The inorganic mineral pigment is an iron oxide pigment, and its dosage is 3%-5% of the desert sand mass.

5. The green and environmentally friendly stone-like paint using desert sand as aggregate according to claim 2, characterized in that, In step a, the pickling involves soaking the desert sand in 5%-10% dilute hydrochloric acid for 2-4 hours, and the drying temperature is 105±5℃; in step b, the surface activation soaking time is 1-2 hours.

6. The green and environmentally friendly stone-like paint using desert sand as aggregate as described in claim 1, characterized in that, The auxiliary aggregate is 40-120 mesh white quartz sand or marble powder.

7. The green and environmentally friendly real stone paint using desert sand as aggregate as described in claim 1, characterized in that, The thickener is hydroxyethyl cellulose.

8. The green and environmentally friendly stone-like paint using desert sand as aggregate as described in claim 1, characterized in that, The film-forming aid is 12-ol ester.

9. A method for preparing a green and environmentally friendly stone-like paint using desert sand as aggregate as described in any one of claims 1-8, characterized in that, Includes the following steps: S100. Mix water, thickener, preservative, and film-forming aid evenly. S200, add silicone-acrylic emulsion and stir until homogeneous; S300, slowly add color-modified desert sand and auxiliary aggregates, and stir until all aggregates are evenly coated with slurry to obtain the finished stone paint product.

10. The method for preparing a green and environmentally friendly stone-like paint using desert sand as aggregate according to claim 9, characterized in that, The stirring in steps S100-S300 is carried out at a low speed, which means the stirring speed is 350-500 rpm. In step S200, the stirring is carried out for 5-10 minutes, and in step S300, the stirring is carried out for 10-15 minutes.

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