Exterior wall stone-like thermal insulation coating and preparation method thereof

Abstract

The invention relates to the technical field of printing ink curing coatings, and discloses a preparation method of an external wall stone-imitating thermal insulation coating. The coating is prepared from the following components in parts by mass: 30 to 50 parts of acrylic emulsion, 8 to 20 parts of glass powder, 5 to 15 parts of ceramic powder, 15 to 30 parts of natural stone powder, 10 to 25 parts of sand grains, 0.3 to 1.2 parts of thickening agent, 0.5 to 1.5 parts of wetting dispersant, 1.5 to 3.5 parts of coalescing agent, 1 to 5 parts of mildew-proof weather-proof agent and 50 to 80 parts of water. By adding the glass powder, the ceramic powder and other components, a microcosmic heat insulation layer is formed in the coating, heat conduction is effectively reduced, energy consumption of a building is reduced, and a good heat insulation effect is achieved. The mildew-proof and weather-proof agent is a brand new compound, and long-acting bacteriostasis is realized by destroying cell walls of mildew or interfering a metabolic enzyme system of the mildew. The mildew-proof coating has high stability in a humid environment, is not easy to decompose, and can provide lasting mildew-proof protection for buildings.

Description

Technical Field

[0001] The invention relates to the technical field of novel ink curing coatings, and in particular to a method for preparing an exterior wall imitation stone thermal insulation coating. Background Art

[0002] In the field of building exterior wall coatings, traditional exterior wall coatings mainly focus on decorative and basic protective functions. However, in actual applications, exterior wall coatings face many severe challenges, among which mildew and weather resistance problems are particularly prominent.

[0003] Mold is extremely common in humid environments. Exterior wall paint exposed to air for extended periods of time can easily breed mold. Mold growth not only affects the building's appearance, causing unsightly spots and discoloration, but can also cause paint to peel, reducing its lifespan. Furthermore, mold metabolites can pose potential hazards to the indoor environment and human health, such as triggering allergic reactions and respiratory illnesses. Traditional coatings often incorporate mold inhibitors to prevent mold. However, these agents have limitations, such as a lack of long-lasting effectiveness, susceptibility to environmental factors, and potential environmental pollution.

[0004] Weather resistance is also a critical issue. Exterior wall coatings must withstand long-term exposure to natural factors, including UV radiation, temperature fluctuations, and wind and rain erosion. UV radiation can cause photochemical reactions in the organic components of the coating, causing it to fade and powder, reducing its protective properties. Drastic temperature fluctuations can induce thermal expansion and contraction stresses in the coating, which can easily lead to cracking and flaking. Wind and rain erosion accelerates the aging process and shortens its service life. Traditional exterior wall coatings lack sufficient weather resistance to meet the longevity and high weather resistance requirements of modern buildings.

[0005] In response to the above problems, although there are some improvement measures in the existing technology, such as using special resins and pigments to improve the weather resistance of coatings, and adding new mildew inhibitors to enhance the mildew resistance effect, these improvements often have certain limitations and cannot fundamentally solve the mildew and weather resistance problems.

[0006] For example, while some weather-resistant coatings have improved their resistance to UV rays to a certain extent, their overall performance in high-temperature and high-humidity environments is still less than ideal, and they are prone to cracking and peeling. While some mildew-resistant coatings can effectively inhibit mold growth in the short term, their effectiveness gradually weakens over time. Furthermore, some mildew inhibitors may have adverse effects on the environment, making them incompatible with environmental protection requirements.

[0007] Therefore, developing an exterior wall imitation stone insulation coating with excellent mildew and weather resistance to overcome the defects of mildew and weather resistance in the prior art has become a technical problem to be solved urgently. Summary of the Invention

[0008] The purpose of the present invention is to provide an exterior wall imitation stone thermal insulation coating with excellent mildew and weather resistance, in order to solve the problems of mildew and insufficient weather resistance of exterior wall coatings in the prior art, while having good thermal insulation effect and realistic stone decorative effect.

[0009] To achieve the above object, the technical solution adopted by the present invention is: an exterior wall imitation stone thermal insulation coating, composed of the following components by weight: 30-50 parts of acrylic emulsion, 8-20 parts of glass powder, 5-15 parts of ceramic powder, 15-30 parts of natural stone powder, 10-25 parts of sand, 0.3-1.2 parts of thickener, 0.5-1.5 parts of wetting and dispersing agent, 1.5-3.5 parts of film-forming aid, 1-5 parts of mildew and weathering agent, and 50-80 parts of water; The mildew and weather resistant agent is a compound shown in Formula 1; Formula 1: ; R1 in Formula 1 is selected from any one of methyl, methoxy, amino, bromine and fluorine.

[0010] Furthermore, the mildew and weather resistant agent is a brand-new compound.

[0011] Furthermore, the mildew-proof and weather-resistant agent has the functions of mildew-proofing, weather-resistant and anti-counterfeiting.

[0012] Furthermore, the mildew and weather resistant agent exhibits fluorescence under ultraviolet light.

[0013] Furthermore, the particle size of the glass powder is 20-80 μm; the particle size of the ceramic powder is 10-50 μm.

[0014] Furthermore, the natural stone powder is 200-400 mesh; the sand particles are 40-120 mesh; and the natural stone powder is any one of marble powder, quartz powder or mica powder.

[0015] Furthermore, the thickener is hydroxyethyl cellulose.

[0016] Furthermore, the wetting and dispersing agent is any one of sodium polyacrylate, potassium polyacrylate, and sodium polymethacrylate.

[0017] Furthermore, the film-forming aid is lauryl alcohol ester.

[0018] Furthermore, the mildew and weather resistant agent is any one of the compounds shown in the following structures: ; .

[0019] A method for preparing an exterior wall imitation stone thermal insulation coating comprises the following steps: S1. The acrylic emulsion, film-forming agent, mildew and weathering agent and 50% parts by mass of water were added to a dispersion vessel and stirred at 300-500r / min for 10min to obtain material A; S2. The wetting and dispersing agent, thickener and remaining water were added to the material A, and the speed was stirred at 800-1200 r / min for 15 min to obtain material B; S3. Add the natural stone powder and sand to the material B, maintain stirring speed for 20 min until uniformly dispersed, to obtain material C; S4. Add the glass powder and ceramic powder to the material C, adjust the speed to 400-600 r / min and stir for 15 min to obtain an exterior wall imitation stone insulation coating.

[0020] Furthermore, the S1 is performed under a nitrogen atmosphere.

[0021] Furthermore, the stirring process in S3 is carried out under a vacuum degree of -0.06 to -0.08 MPa.

[0022] Furthermore, the exterior wall imitation stone thermal insulation coating is a new type of ink coating.

[0023] Furthermore, the exterior wall imitation stone thermal insulation coating is a curable coating.

[0024] The mildew and weather-resistant agent of the present invention achieves long-lasting antibacterial effect by destroying the cell wall of mold or interfering with its metabolic enzyme system. Compared with traditional mildew inhibitors, the compound is highly stable in humid environments, is not easily decomposed, and provides long-lasting mildew protection. The mildew and weather-resistant agent has the effect of resisting ultraviolet rays and oxygen free radicals, thereby producing weather resistance. Under high temperature and high humidity conditions, the compound synergizes with glass powder and ceramic powder to form a dense inorganic barrier, reducing aging caused by wind and rain erosion. The mildew and weather-resistant agent exhibits fluorescence under ultraviolet light because its molecular structure has a large π conjugated system, which can stimulate electron transitions, exhibit fluorescence, and achieve an anti-counterfeiting effect.

[0025] The acrylic emulsion described in this invention serves as the base binder for the coating, providing film-forming properties and adhesion. It forms a continuous, dense film layer, reducing water penetration, thereby reducing the risk of mildew and enhancing weather resistance. It also provides support for other components, ensuring the overall stability of the coating. Glass powder and ceramic powder serve as functional fillers, offering high hardness and weather resistance. Glass powder reflects ultraviolet light, reducing photoaging; ceramic powder provides thermal stability, resisting stress cracking caused by temperature fluctuations. They act synergistically in thermal insulation: by forming a microscopic insulating layer, they reduce heat conduction and enhance the overall thermal insulation performance of the coating. Natural stone powder and sand act as aggregates, enhancing the mechanical strength and weather resistance of the coating. Thickeners and wetting and dispersing agents: Thickeners adjust the viscosity of the coating, preventing settling and sagging, ensuring uniform application during application without affecting other properties. Wetting and dispersing agents promote uniform dispersion and wetting of all components, reducing agglomeration, thereby improving the uniformity and stability of the coating. Coalescing aids help the acrylic emulsion form a continuous, smooth film layer at low temperatures, improving the coating's flexibility and durability. This enhances weather resistance, prevents cracking caused by temperature fluctuations, and provides an excellent carrier for the mildew and weathering agent. This is a key innovative component that directly addresses mildew and weathering issues. It is a brand-new compound with multiple functions: mildew resistance and weathering resistance.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. Significantly improved thermal insulation performance: The exterior wall imitation stone insulation coating of the present invention forms a microscopic thermal insulation layer in the coating by adding ingredients such as glass powder and ceramic powder, which effectively reduces heat conduction, reduces the energy consumption of the building, and achieves good thermal insulation effect.

[0027] 2. Greatly enhanced weather resistance: The mildew-proof and weather-resistant agent in the paint works synergistically with the glass powder and ceramic powder to resist the erosion of natural factors such as ultraviolet rays and oxygen free radicals, and reduce stress cracking caused by temperature changes, thereby significantly improving the weather resistance of the paint and extending its service life.

[0028] 3. Long-lasting and effective mildew resistance: The mildew and weathering agent used is a new compound that achieves long-lasting antibacterial properties by destroying the mold cell wall or interfering with its metabolic enzyme system. It is highly stable in humid environments and does not easily decompose, providing long-lasting mildew protection for buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the nuclear magnetic resonance image of the mildew and weather resistant agent 1 described in the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Synthesis Example 1 Synthesis of mildew and weathering agent 1: .

[0032] To the reaction system, 15 g of raw material 1, 7.80 g of raw material 2, and 200 ml of dichloromethane were added and stirred until completely dissolved. 2.160 g of concentrated sulfuric acid was slowly added dropwise, and the temperature was raised to 85°C for 6 h. After the reaction, the pH of the system was adjusted to neutral with 0.10 mol / L aqueous sodium bicarbonate solution. The layers were separated, and the organic phase was retained. The organic phase was dried over anhydrous magnesium sulfate, dried by spin chromatography (silica gel column chromatography, using a mixture of n-heptane and ethyl acetate as the eluent), and dried by spin drying to obtain 19.50 g of intermediate 1. Structural identification data - mass spectrum MS+ 1:500.

[0033] Under a nitrogen atmosphere, 19.50 g of intermediate 1, 15.42 g of raw material 3, 7.50 g of sodium tert-butoxide, 0.4 g of tri-tert-butyl phosphine, and 250 ml of toluene were added to the reaction system. The atmosphere was replaced with nitrogen three times, and 1.07 g of tris(dibenzylideneacetone)dipalladium was added. The mixture was stirred evenly, heated to 120°C, and refluxed for 12 hours. After the reaction, the temperature was slightly lowered and filtered through diatomaceous earth. The filtrate was cooled to room temperature and washed three times with water. The organic phase was retained, and the aqueous phase was extracted with dichloromethane. The combined organic phases were dried over anhydrous magnesium sulfate and the solvent was removed using a rotary evaporator. The mixture was then spin-dried and eluted with a mixture of n-heptane and ethyl acetate to obtain 18.37 g of mildew and weathering agent 1. Structural identification data - mass spectrum MS+1: 777.

[0034] Antifungal and weatherproofing agent 1 1 HNMR(Chloroform-d)δ8.02-7.93(m,1H),7.90(dd,1H),7.76(m,1H),7.65-7.53(m,3H),7.48(dd,1H),7.41-7.20(m,5H),6.32(s,1H),4.06(t,1H) ),3.76(m,1H),3.63(m,1H),2.77(m,1H),2.63(m,1H),2.49(d,3H),2.29 (m,1H),1.98(m,1H),1.68-1.44(m,2H),1.44-1.28(m,2H),0.87(t,3H).

[0035] Synthesis Example 2 - Synthesis Example 5 In Synthesis Examples 2-5, mildew-proof and weather-resistant agents 2-5 were synthesized sequentially, replacing raw material 2. The remaining compositions remained the same as in Synthesis Example 1. The specific structures of raw material 2, mildew-proof and weather-resistant agents 2-5, and structural identification data are shown in the table below.

[0036] Example 1 Preparation of an exterior wall imitation stone thermal insulation coating: 1. Raw materials mass ratio: Acrylic emulsion: 40 parts, purchased from Jiangsu Plus Biotechnology Co., Ltd., solid content ≥45%; Glass powder: 15 parts, particle size between 20-80 μm, purchased from: Foshan Youhe Chemical Technology Co., Ltd. Ceramic powder: 10 parts, particle size between 10-50 μm, purchased from Jiangxi Saici Materials Co., Ltd. Natural stone powder: 25 parts, 300 mesh marble powder, purchased from: Guangxi Hezhou Guibao Powder Co., Ltd. Sand: 20 parts, 80 mesh sand, purchased from Wuhan Penglei Biotechnology Co., Ltd. Thickener: 0.8 parts, hydroxyethyl cellulose, purchased from Shanghai Yuanye Biotechnology Co., Ltd. Wetting and dispersing agent: 1.0 part, selected sodium polyacrylate, purchased from: Hubei Zhonglong Kangsheng Fine Chemical Co., Ltd.; Film-forming aid: 2.5 parts, selected from lauryl alcohol ester, purchased from Shanghai Yuanye Biotechnology Co., Ltd. Antifungal and weathering agent: 3.0 parts, using Antifungal and weathering agent 1, the product synthesized in Synthesis Example 1; Water: 65 parts.

[0037] 2. Preparation method: S1. Add acrylic emulsion, film-forming aid, mildew and weathering agent, and 50% of the total water (i.e., 32.5 parts of water) to a dispersion kettle. Under nitrogen atmosphere, stir and mix at 400 r / min for 10 minutes until the materials are evenly dispersed to obtain material A.

[0038] S2. Add a wetting and dispersing agent, a thickener, and the remaining water (32.5 parts) to material A, increase the stirring speed to 600 r / min, and continue stirring for 15 minutes to obtain material B.

[0039] S3. Natural stone powder and sand were added to material B, the speed was maintained at 6000r / min, and stirred for 20 minutes under vacuum conditions of -0.07MPa to obtain material C; S4. Add glass powder and ceramic powder to material C, adjust the speed to 500 r / min, and stir for 15 minutes to obtain an exterior wall imitation stone insulation coating.

[0040] Example 2-Example 5 The preparation of an exterior wall imitation stone insulation coating refers to the preparation method of Example 1, except that the mildew and weather resistant agent therein is replaced with mildew and weather resistant agent 2 to mildew and weather resistant agent 5 in sequence, and the rest remains the same as Example 1.

[0041] Comparative Example 1 The preparation of an exterior wall imitation stone insulation coating is based on the preparation method of Example 1, except that the mildew and weathering agent is replaced with salicylate (structure: , which is a commonly used antifungal agent in industry), and the rest are the same as those in Example 1.

[0042] Comparative Example 2 A preparation method of an exterior wall imitation stone insulation coating is prepared by referring to the preparation method of Example 1, wherein the mildew and weathering agent is replaced by an antioxidant RD (structure: , with good weather resistance), and the rest remains the same as in Example 1.

[0043] Comparative Example 3 An exterior wall imitation stone thermal insulation coating was prepared by referring to the preparation method of Example 1, except that the mildew and weathering agent was replaced with 1.5 parts of salicylate + 1.5 parts of antioxidant RD, and the rest remained the same as Example 1.

[0044] Comparative Example 4 The preparation of an exterior wall imitation stone thermal insulation coating refers to the preparation method of Example 1, except that the mildew and weathering agent is replaced with mildew inhibitor IPBC (CAS: 55406-53-6, a mildew inhibitor commonly used in industry), and the rest remains the same as Example 1.

[0045] Comparative Example 5 The preparation of an exterior wall imitation stone insulation coating refers to the preparation method of Example 1, except that the mildew and weathering agent is replaced with antioxidant H (CAS: 74-31-7, with good weather resistance), and the rest remains the same as Example 1.

[0046] Comparative Example 6 The preparation method of an exterior wall imitation stone insulation coating refers to the preparation method of Example 1, except that the mildew and weathering agent is replaced by 1.5 parts of antioxidant H + 1.5 parts of mildew inhibitor IPBC, and the rest remains the same as Example 1.

[0047] Comparative Example 7 A kind of preparation of exterior wall imitation stone thermal insulation coating refers to the preparation method of embodiment 1, and replaces the mildew and weathering agent therein with , and the rest remain the same as in Example 1.

[0048] Comparative Example 8 A kind of preparation of exterior wall imitation stone thermal insulation coating refers to the preparation method of embodiment 1, and replaces the mildew and weathering agent therein with , and the rest remain the same as in Example 1.

[0049] Comparative Example 9 The preparation of an exterior wall imitation stone thermal insulation coating is based on the preparation method of Example 1, except that the mildew and weathering agent is not added, and the rest is the same as in Example 1.

[0050] Comparative Example 10 The preparation of an exterior wall imitation stone thermal insulation coating is similar to that of Example 1 except that the glass powder is not added. Other aspects of the preparation are the same as those of Example 1.

[0051] Comparative Example 11 The preparation of an exterior wall imitation stone thermal insulation coating is based on the preparation method of Example 1, except that the ceramic powder is not added, and the rest is the same as in Example 1.

[0052] Comparative Example 12 The preparation of an exterior wall imitation stone thermal insulation coating is based on the preparation method of Example 1, except that no sand is added, and the rest is the same as in Example 1.

[0053] Performance testing: The exterior wall imitation stone insulation coatings prepared in the examples and comparative examples were applied to the surface of a polytetrafluoroethylene plate, cured at low temperature, and removed after drying to prepare thin disc samples of a specified size (30 mm in diameter and 1 mm in thickness) for performance testing.

[0054] 1. Thermal conductivity: Referring to GB10295-1988 (Determination of steady-state thermal resistance and related properties of insulating materials - Heat flow meter method), the thermal conductivity of the sample was measured using a DRL-I thermal conductivity meter. The data are shown in the following table.

[0055] 2. Oxygen index measurement: Cut the coating into 200mm×20mm×1mm test pieces. Use a JF-3 oxygen index tester to adjust the concentrations of oxygen and nitrogen. Ignite the coating test piece and observe the oxygen concentration during continuous combustion. The data are shown in the table below.

[0056] 3. Weathering test: The samples were placed in a xenon lamp aging test chamber and exposed for 2000 hours. The ΔE value (based on the CIELAB standard) was measured using a spectrocolorimeter. The data are shown in the table below. Exposure conditions: Radiation intensity: 0.35W / m 2 (at 340nm wavelength); temperature cycle: 60℃ (light phase) to 40℃ (dark phase), 8 hours of light + 4 hours of condensation (simulated rain) per cycle; relative humidity: 50%±5% (light phase), 95%±5% (condensation phase).

[0057] 4. Anti-mildew test: A mixed mold spore suspension (containing Aspergillus niger, Penicillium and Trichoderma, and the spore concentration of each mold is 1×10 6 CFU / mL), soak the thin disc sample in the mixed mold spore suspension for 3 seconds, remove it, and continue to culture it at a temperature of 28℃ and a relative humidity of 95% for 28 days. The mold growth coverage rate (%) is observed. The data are shown in the following table.

[0058] The performance of the embodiment group of the present invention is significantly better than that of the comparative group, highlighting the superiority of the exterior wall imitation stone thermal insulation coating. In terms of thermal insulation performance, the thermal conductivity of the embodiments is generally low, reflecting an excellent thermal insulation effect, while the comparative groups, especially those lacking glass powder or ceramic powder, show a clear deterioration trend. In terms of the oxygen index index, the values ​​of the embodiments are higher, indicating that the flame retardant performance is effectively improved, while most comparative groups show a lower oxygen index, suggesting insufficient flame retardancy. In terms of weather resistance, the ΔE value of the embodiments is lower, indicating that the color stability and anti-aging ability are strong, while the ΔE value of the comparative groups is higher, suggesting poor weather resistance. In terms of mildew resistance, the mold growth coverage of the embodiments is lower as a whole, proving that the mildew resistance effect is significant, while the comparative groups, especially those without adding mildew resistance weathering agents or using substitutes, have higher coverage, indicating that the mildew resistance is seriously insufficient. These trends consistently reflect the key optimization role of the mildew resistance weathering agent, glass powder and ceramic powder of the present invention in synergy.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An exterior wall imitation stone thermal insulation coating, characterized in that: The invention is composed of the following components in parts by mass: 30-50 parts of acrylic emulsion, 8-20 parts of glass powder, 5-15 parts of ceramic powder, 15-30 parts of natural stone powder, 10-25 parts of sand, 0.3-1.2 parts of thickener, 0.5-1.5 parts of wetting and dispersing agent, 1.5-3.5 parts of film-forming aid, 1-5 parts of mildew and weathering agent, and 50-80 parts of water; The mildew and weather resistant agent is a compound shown in Formula 1; Formula 1: ; R1 in Formula 1 is selected from any one of methyl, methoxy, amino, bromine and fluorine.

2. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The particle size of the glass powder is 20-80 μm; The particle size of the ceramic powder is 10-50 μm.

3. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The natural stone powder is 200-400 mesh; The sand particles are 40-120 mesh; The natural stone powder is any one of marble powder, quartz powder or mica powder.

4. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The thickener is hydroxyethyl cellulose.

5. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The wetting and dispersing agent is any one of sodium polyacrylate, potassium polyacrylate, and sodium polymethacrylate.

6. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The film-forming aid is lauryl alcohol ester.

7. The exterior wall imitation stone thermal insulation coating according to claim 1, characterized in that: The mildew and weathering agent is any one of the compounds shown in the following structures: ； 。 8. A method for preparing an exterior wall imitation stone thermal insulation coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The acrylic emulsion, film-forming agent, mildew and weathering agent and 50% parts by mass of water were added to a dispersion vessel and stirred at 300-500r / min for 10min to obtain material A; S2. The wetting and dispersing agent, thickener and remaining water were added to the material A, and the speed was stirred at 800-1200 r / min for 15 min to obtain material B; S3. Add the natural stone powder and sand to the material B, maintain stirring speed for 20 min until uniformly dispersed, to obtain material C; S4. Add the glass powder and ceramic powder to the material C, adjust the speed to 400-600 r / min and stir for 15 min to obtain an exterior wall imitation stone insulation coating.

9. The method for preparing the exterior wall imitation stone thermal insulation coating according to claim 8, characterized in that: The S1 was performed under a nitrogen atmosphere.

10. The method for preparing the exterior wall imitation stone thermal insulation coating according to claim 8, characterized in that: The stirring process in S3 is carried out under a vacuum degree of -0.06 to -0.08 MPa.

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