CN112745726A - High-performance organic-inorganic composite heat-reflection waterproof coating, and preparation method and application thereof - Google Patents
High-performance organic-inorganic composite heat-reflection waterproof coating, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a high-performance organic-inorganic composite heat-reflecting waterproof coating, a preparation method and application thereof. The high-performance organic-inorganic composite heat-reflecting waterproof coating is prepared from the following components in percentage by weight: 5-10% of potassium silicate, 15-20% of silica sol, 10-15% of acrylic emulsion, 3.0-5.0% of glass beads, 5.0-10% of far infrared ceramic powder, 12-15% of titanium dioxide, 15-20% of pigment and filler, 0.4-0.6% of thickening agent, 0.1-0.2% of pH regulator, 0.5-0.7% of dispersing agent, 0.1-0.2% of wetting agent, 0.1-0.2% of defoaming agent, 0.5-0.8% of film-forming assistant, 0.5-1% of organosilicon waterproofing agent and the balance of water. The composite heat-reflecting waterproof coating has strong adhesive force and water resistance, provides an effective and lasting protection effect for a wall body, and expands the application of the composite heat-reflecting waterproof coating in the field of external wall heat insulation.
Description
Technical Field
The invention belongs to the field of building coatings, and particularly relates to a high-performance organic-inorganic composite heat-reflecting waterproof coating, and a preparation method and application thereof.
Background
With the rapid development of economy in China, the national requirements on energy conservation and environmental protection are higher and higher, and emission reduction in the field of buildings can be realized through building energy conservation. Therefore, the development and popularization of the building exterior wall heat insulation coating with heat insulation and heat preservation effects have great significance for reducing the use of refrigeration equipment, reducing energy consumption and saving social energy. However, the existing heat-insulating coating in China has various types and uneven quality, and is difficult to achieve high-efficiency and durable heat-insulating effect.
Meanwhile, in recent years, silicate-based water-based inorganic coatings have been rapidly developed, and the inorganic coatings are favored by the market because of good alkali resistance, pollution resistance, and excellent weather resistance and environmental protection. But the inorganic heat-insulating coating has poor storage stability, poor water resistance, easy powder shedding and the like, and seriously influences the long-term effectiveness of the heat-insulating effect, so the inorganic heat-insulating coating grows slowly in China.
In the prior art, some people obtain organic and inorganic waterproof paint by compounding and modifying silicate with organic polymer emulsion, and Chinese patent CN201810560614.3 discloses an environment-friendly building paint which comprises the following raw materials: potassium silicate, silica sol, polyvinyl acetate emulsion, acrylic emulsion, fly ash, titanium dioxide, an auxiliary agent and deionized water; the auxiliary agent comprises a dispersing agent, a stabilizing agent, a thickening agent, a defoaming agent, a flatting agent, a preservative, a coupling agent, cellulose and a pH regulator. The coating is green and environment-friendly, and has excellent physical properties; the polyvinyl acetate emulsion, the acrylic emulsion, the fly ash, the titanium dioxide and other raw materials are added, so that the coating has the advantages of good elasticity, good rheological property, good anticorrosion effect, good waterproof effect and the like, but the patent has the following defects: (1) poor heat insulation performance, (2) poor weather resistance, (3) poor waterproofness, and (4) insufficient adhesive force and strength.
Disclosure of Invention
The invention aims to provide a high-performance organic-inorganic composite heat-reflecting waterproof coating, a preparation method and application aiming at the defects, and the composite coating has two characteristics of heat insulation and water resistance. Common potassium silicate on the market has low modulus, poor strength, poor water resistance and poor weather resistance; the silica sol has the advantages of strong permeability, strong adhesive force, ultrahigh hardness, stain resistance and the like, but is brittle and easy to crack after being cured. The potassium silicate, the silica sol and the acrylic emulsion are compounded for use, so that the high strength and strong water resistance of a paint film can be realized, and the defects of hardness, brittleness and easy cracking of the paint film can be overcome.
The high-performance organic-inorganic composite heat-reflecting waterproof coating disclosed by the invention is prepared from the following components in percentage by weight: 5-10% of potassium silicate, 15-20% of silica sol, 10-15% of acrylic emulsion, 3.0-5.0% of glass beads, 5.0-10% of far infrared ceramic powder, 12-15% of titanium dioxide, 15-20% of pigment and filler, 0.4-0.6% of thickening agent, 0.1-0.2% of pH regulator, 0.5-0.7% of dispersing agent, 0.1-0.2% of wetting agent, 0.1-0.2% of defoaming agent, 0.5-0.8% of film-forming assistant, 0.5-1% of organosilicon waterproofing agent and the balance of water.
Preferably, the weight ratio of potassium silicate to glass beads is 1: (1-1.5), if the dosage of the glass microspheres is too much, the glass microspheres cannot be fully wrapped by the potassium silicate and the acrylic emulsion, so that the mechanical property of the coating is reduced, and if the dosage of the potassium silicate is too much, the thermal stability of the coating is poor when the coating is placed, the coating is easy to break emulsion, and the coating is poor in water resistance and easy to crack and fall off.
The functional functions of the components in the high-performance organic-inorganic composite heat-insulating waterproof coating are as follows:
the potassium silicate is a nano-scale product after functional modification and inert treatment, can effectively coat the filler, and has higher content of separated free silicic acid during curingCan rapidly and effectively penetrate into the substrate by capillary action, and can react with Ca (OH) in the substrate2Reaction to produce CaSiO3The gel has good adhesive property, so that the paint film has strong adhesive force to the base layer and excellent sealing property. In addition, the potassium silicate is a pure inorganic product, has strong alkalinity, can effectively prevent the growth and the propagation of organisms such as fungi, algae and the like, and has good heat resistance and fire resistance after being solidified. The potassium silicate is preferably nano-modified potassium silicate KS33 of Samson chemical.
The silica sol is a colloid in which nano-scale silica particles are uniformly dispersed in water, and has the characteristics of large specific surface area, high surface energy, high temperature resistance, oxidation resistance, high hardness and the like. In the process of dehydration of the silica sol, silicon hydroxyl groups among monomer silicic acid are self-polymerized, so that a firm Si-O-Si bond can be formed, and a spatial silica network coating film is formed. And the addition of the silica sol can reduce the specific gravity of soluble salt in a system, so that the coating has better mechanical strength and water resistance. The silica sol is preferably ZC301 of Sessian chemical.
The glass transition temperature of the acrylate emulsion is 20-30 ℃, the solid content of the acrylate emulsion is 45-55%, the acrylate emulsion within the range has good strength, and the acrylate emulsion is also beneficial to increasing the flexibility of a paint film, and provides powerful support for preventing the paint film from cracking and improving the water resistance of the paint film.
The glass beads are hollow tiny round particles, the main component is borosilicate, the particle size is 10-100 micrometers, the wall thickness is 1-2 micrometers, the packing density is small, according to measurement, the thermal conductivity coefficient of the beads is 0.03-0.1W/(m.k), and the glass beads have good heat insulation performance.
Preferably, the glass beads are treated by the following method, which sequentially comprises the following steps: firstly, adding glass beads into NaOH solution with the mass concentration of 1-2% according to the mass ratio of 1 (2.5-3.5), mechanically stirring for 1-2h, washing with deionized water to be neutral, and drying at the temperature of 100-; weighing the obtained glass beads, adding 2-3% by mass of aluminate into the glass beads, mixing the glass beads in a high-speed mixer for 2-3h, and finally drying the glass beads at the temperature of 140-160 ℃ to obtain the glass bead.
The aluminate is preferably PN-827 aluminate from Nanjing Pinning coupling agent, Inc.
The far infrared ceramic powder is white powder and is formed by mixing a plurality of substances, the far infrared ceramic powder takes far infrared rays (the infrared radiance is higher) which can be radiated more than normal objects as a main characteristic function, the heat insulation coating containing the far infrared ceramic powder is coated on the outer surface of a building, the high solar reflectance and the high hemisphere emissivity can be realized, and the using amount is preferably 5-10%.
The titanium dioxide is rutile titanium dioxide, the rutile titanium dioxide is prepared by a sulfuric acid method, and the zirconium-silicon-aluminum-phosphorus multi-inorganic coating and organic treatment technology are adopted, so that the hue and the particle size of the titanium dioxide are controlled very accurately, the dispersibility and the stability of the titanium dioxide in the water-based paint can be improved, and the covering power and the heat reflection performance of a paint film can also be improved. The dosage is preferably 10-15%.
The pigment and filler is selected from one or more of inert filling powder such as heavy calcium, talcum powder or barium sulfate, and the dosage is preferably 15-20%.
The thickener is preferably hydroxyethyl cellulose ether; the dispersant is preferably a high molecular polymer dispersant; the wetting agent is preferably alkyl polyoxyethylene ether wetting agent; the defoaming agent is preferably mineral oil defoaming agent; the film-forming auxiliary is preferably 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, i.e., the alcohol ester twelve.
The pH regulator is amine substance, preferably AMP95 of Dow chemical.
The water is preferably deionized water.
The invention also provides a preparation method of the organic-inorganic composite heat-insulating waterproof coating, which sequentially comprises the following steps:
(1) firstly, 1/3-1/2 of the total amount of the required water is added into a container, then 1/3-1/2 of the total amount of the required thickening agent, a pH regulator, a wetting agent, a dispersing agent and a defoaming agent are added, and the mixture is stirred for 3-5min at a low speed (600-;
(2) then adding pigment, filler and titanium dioxide, dispersing at high speed (1500-;
(3) adding the acrylic ester emulsion, the film-forming assistant, potassium silicate, silica sol, the balance of thickener, the organic silicon waterproof agent and the balance of water into a dispersion cylinder, stirring for 10-15min, and uniformly mixing to obtain the organic-inorganic composite heat-insulating waterproof coating.
The addition sequence of the components in the steps is fixed, for example, potassium silicate cannot be added in the step (2), if the potassium silicate is added in the step (2), the surface of the coating can be damaged under high-speed stirring, the filler cannot be effectively coated, and the adhesion of a paint film to a base layer is poor during curing.
The invention also comprises the application of the organic-inorganic composite heat-insulating waterproof coating in the exterior wall of a building, wherein the base layer contains Ca (OH)2Can be reacted with Ca (OH) in the substrate2Reaction is carried out to obtain CaSiO3The gel has good adhesive property, so that the paint film has strong adhesive force to the base layer and excellent sealing property.
Compared with the prior art, the invention has the following characteristics and advantages:
(1) the organic-inorganic composite heat-insulating waterproof coating disclosed by the invention is added with a silicate material as an important film-forming substance, and is compounded with silica sol, so that the system modulus is increased, and the overall performance of the coating is improved. The silica particles in the silica sol have the excellent characteristics of high rigidity, high strength, ultraviolet absorption, high adsorbability, environmental protection and the like, and the silica sol is adopted to modify the coating, so that the adhesive force, the impact resistance and the mechanical strength of the coating are improved. Meanwhile, the acrylate emulsion added into the system can provide certain flexibility for the system and prevent cracking caused by overhigh rigidity of a paint film. The acrylate emulsion has good yellowing resistance and contributes to the weather resistance of the coating;
(2) the far infrared ceramic powder in the organic-inorganic composite heat-insulating waterproof coating can reflect most of solar rays, so that heat is prevented from entering the interior of a wall body, and the glass beads can effectively block heat by virtue of lower heat conductivity coefficient and higher reflectivity. However, the glass beads can embrittle the paint film, the mechanical strength of the paint film is influenced, the doping amount is not too high easily, the defect can be overcome by the far infrared ceramic micro powder, and the heat-insulating property of the coating can reach the best by the synergistic effect of the far infrared ceramic micro powder and the far infrared ceramic micro powder;
(3) the organic-inorganic composite heat-insulating waterproof coating disclosed by the invention not only has stronger adhesive force, excellent alkali-resistant weather-resistant performance, high-efficiency mildew-proof antibacterial performance, but also has stronger water-resistant performance, so that the service life of a product can be greatly prolonged, a more effective and lasting protection effect is provided for a wall body, and the application of the organic-inorganic composite heat-insulating waterproof coating in the field of external wall heat insulation is greatly expanded.
Drawings
Fig. 1 shows a device for testing thermal insulation performance.
Detailed Description
Specific embodiments of the present invention will now be described as follows:
the raw materials described in the examples are as follows: the hydroxyethyl cellulose ether is Shanghai Kangji chemical company Limited S30000YP2, the dispersant is METOLAT 394 of German Ming Ling chemical, the defoamer is AGITAN 351 of German Ming Ling chemical, the pH regulator is AMP95 of Dow chemical, and the film-forming aid is commercially available alcohol ester twelve.
The potassium silicate is nano modified potassium silicate KS33 in the Simpson chemical, the silica sol is ZC301 in the Simpson chemical, the acrylic emulsion is GD-4261 with wide sunlight, the solid content is 48%, and the glass transition temperature is 20 ℃. The glass beads are purchased from Son Natrade company Limited in Guangzhou city, the far infrared ceramic powder is purchased from Asahi Yangye industry in Lingshou county, the titanium dioxide brand is R902, the manufacturer is DuPont in the United states, the heavy calcium is purchased from Guangxi Munsen industry, the wetting agent brand is M364, the manufacturer is German Mingling, the organosilicon waterproofing agent brand is BS1306, and the manufacturer is German Wake.
The formulations of examples 1-2 and comparative examples 1-3 are shown in Table 1, with the units being parts by weight.
TABLE 1
Table 2 shows the formulations of examples 4-6 and comparative examples 3-4 in parts by weight, wherein examples 4 and 5 are the same as examples 1 and 2, respectively, except that the glass beads of examples 4 and 5 were treated as follows: firstly, adding glass beads into a NaOH solution with the mass concentration of 1% according to the mass ratio of 1:3, mechanically stirring for 1h, washing the mixture to be neutral by using deionized water, and then drying the mixture at 110 ℃ for later use; weighing the obtained glass beads, adding 2% by mass of aluminate ester into the glass beads, mixing the glass beads in a high-speed mixer for 2 hours, and finally drying the glass beads in the environment of 150 ℃, wherein the aluminate ester is selected from Nanjing pining aluminate ester PN-827.
The formulation of comparative example 3 is different from example 6 in that the amount of glass beads is 80 parts and the far infrared ceramic fine powder is not contained, and the formulation of comparative example 4 is different from example 6 in that the amount of far infrared ceramic fine powder is 80 parts and the glass beads are not contained.
TABLE 2
The preparation methods of the above examples and comparative examples are as follows:
(1) 1/2 of the total amount of the required water is firstly added into a container, then 1/2 of the total amount of the required thickening agent, a pH regulator, a wetting agent, a dispersing agent and a defoaming agent are added, and the mixture is stirred at a low speed (800r/min) for 5min until a uniform colloidal substance is formed;
(2) then adding pigment, filler and titanium dioxide, dispersing at high speed (1600r/min) for 30min until the fineness reaches below 40 μm, and then adding glass beads under low speed (700r/min) stirring to obtain uniform and stable slurry;
(3) adding the acrylate emulsion, the film-forming assistant, potassium silicate, silica sol, the balance of the thickener, the organic silicon waterproof agent and the balance of water into a dispersion cylinder, stirring for 10min, and uniformly mixing to obtain the organic-inorganic composite heat-insulating waterproof coating.
The formulations of examples 1-3 and comparative examples 1-2 were tested for performance as required in the JG/T26-2002 "inorganic exterior wall coatings for buildings" standard, and the data are given in Table 3.
TABLE 3
From the detection results in the table, the organic-inorganic composite heat-insulating waterproof coating disclosed by the invention is excellent in performance, and the physical and chemical properties of the coating completely meet the requirements of JG/T26-2002 inorganic building exterior wall coatings.
The formulations of examples 3 to 5 and comparative examples 4 to 5 were subjected to performance tests as required in the JG/T26-2002 "inorganic exterior wall coatings for buildings" standard, and the data are shown in Table 4.
TABLE 4
Comparing examples 4 and 5 with examples 1 and 2, it can be seen that after the glass beads are subjected to surface treatment, the mechanical properties of the whole coating are greatly improved, and the adhesive force and the strength are obviously increased, which indicates that the modified glass beads can effectively improve the bonding effect of the interface, enhance the mechanical properties, and simultaneously, the heat insulation effect is obviously improved.
Through a large number of tests, the glass beads have synergistic effect with the far infrared ceramic micro powder in the aspect of water permeability after being modified.
The heat insulation performance test of the organic-inorganic composite heat insulation waterproof coating is carried out according to the following method: the fiber reinforced calcium silicate board is used as a test board for a thermal insulation temperature difference test, the size of the test board is 100mm multiplied by 5mm, and the preparation of the coating is carried out according to the regulation in GB/T9271-2008 'colored paint and varnish standard test board'. The test conditions (the heat insulation performance test device is shown in figure 1) are that (1) indoor test is carried out, and the door and the window are ensured to be tightly closed when the experiment is carried out; (2) adjusting voltage to ensure that the temperature of the upper surface of the plate is (75 +/-2) DEG C during testing; (3) in the test process, a test board is placed on the cavity, the coating surface faces to the iodine-tungsten lamp, and the change of the temperature of the inner surface of the test board along with time is observed; (4) to ensure data stability, the test time was 1 h. The specific results are shown in Table 5.
TABLE 5
As can be seen from Table 5, the organic-inorganic composite heat-insulating waterproof coating of comparative example 1 and comparative example 2, after being added with the glass beads and the far infrared ceramic micro powder, has a heat-insulating temperature difference of nearly 10 ℃ compared with the common exterior wall coating, and the comparative example 1 and comparative example 2 have a better effect on heat insulation of the base material. Comparing example 1 with example 2, it was found that when the glass beads and the far infrared ceramic fine powder act synergistically, the heat insulating temperature difference can be reduced by about 1 ℃. However, from the data analysis in table 3, for the strength and water permeability, example 2 is better than examples 1 and 3, which shows that the compounding of silica sol and potassium silicate can optimize the performance of the coating, the increase of silica sol can effectively improve the mechanical properties of wear resistance, hardness and the like of the coating, and simultaneously, the potassium silicate KS33 of the invention can more effectively permeate into the base layer, thereby realizing higher adhesion and excellent sealing property. Wherein the water permeability is tested according to the standard of GB/T9755-2014.
Claims (10)
1. The organic-inorganic composite heat-reflecting waterproof coating is characterized by comprising the following components in percentage by weight:
5-10% of potassium silicate, 15-20% of silica sol, 10-15% of acrylic emulsion, 3.0-5.0% of glass beads, 5.0-10% of far infrared ceramic powder, 12-15% of titanium dioxide, 15-20% of pigment and filler, 0.4-0.6% of thickening agent, 0.1-0.2% of pH regulator, 0.5-0.7% of dispersing agent, 0.1-0.2% of wetting agent, 0.1-0.2% of defoaming agent, 0.5-0.8% of film-forming assistant, 0.5-1% of organosilicon waterproofing agent and the balance of water.
2. The organic-inorganic composite heat-reflecting waterproof paint according to claim 1, characterized in that the potassium silicate is nano-modified potassium silicate KS33 of Western Samson chemical, and the silica sol is ZC301 of Western Samson chemical.
3. The organic-inorganic composite heat-reflecting waterproof coating material according to claim 1, wherein the weight ratio of potassium silicate to glass beads is 1: (1-1.5).
4. The organic-inorganic composite heat-reflecting waterproof coating as claimed in claim 1, wherein the acrylate emulsion has a glass transition temperature of 20 ℃ to 30 ℃ and a solid content of 45% to 55%.
5. The organic-inorganic composite heat-reflecting waterproof coating material according to claim 1, wherein the particle size of the glass beads is 10-100 micrometers, the wall thickness is 1-2 micrometers, and the thermal conductivity is 0.03-0.1W/(m.k).
6. The organic-inorganic composite heat-reflecting waterproof coating according to claim 5, characterized in that the glass beads are treated by the following method, which comprises the following steps in sequence: firstly, adding glass beads into NaOH solution with the mass concentration of 1-2% according to the mass ratio of 1 (2.5-3.5), mechanically stirring for 1-2h, washing with deionized water to be neutral, and drying at the temperature of 100-; weighing the obtained glass beads, adding 2-3% by mass of aluminate into the glass beads, mixing the glass beads in a high-speed mixer for 2-3h, and finally drying the glass beads in an environment of 140-160 ℃.
7. The organic-inorganic composite heat-reflective waterproof coating material of claim 6, wherein the aluminate is aluminate PN-827 of Nanjing Pinin coupling agent, Inc.
8. The organic-inorganic composite heat-reflective waterproof coating material according to claim 1, wherein the thickener is hydroxyethyl cellulose ether; the dispersant is a high molecular polymer dispersant; the wetting agent is alkyl polyoxyethylene ether wetting agent; the defoaming agent is mineral oil defoaming agent; the film forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, and the pH regulator is an amine substance.
9. The preparation method of the organic-inorganic composite heat-reflecting waterproof coating material according to claim 1, characterized by comprising the following steps in sequence:
(1) firstly, 1/3-1/2 of the total amount of the required water is added into a container, then 1/3-1/2 of the total amount of the required thickening agent, a pH regulator, a wetting agent, a dispersing agent and a defoaming agent are added, and the mixture is stirred for 3-5min at the rotating speed of 600-;
(2) then adding pigment, filler and titanium dioxide, dispersing for 30-35min at the rotating speed of 1500-;
(3) adding the acrylic ester emulsion, the film-forming assistant, potassium silicate, silica sol, the balance of thickener, the organic silicon waterproof agent and the balance of water into a dispersion cylinder, stirring for 10-15min, and uniformly mixing to obtain the organic-inorganic composite heat-insulating waterproof coating.
10. The use of the organic-inorganic composite heat-reflective waterproof coating material in the exterior wall of a building according to claim 1, wherein the base layer contains Ca (OH)2。
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| CN112047744A (en) * | 2020-07-17 | 2020-12-08 | 北京盈德化工有限公司 | Heat insulation material and preparation method and application thereof |
| CN113122086A (en) * | 2021-05-10 | 2021-07-16 | 上海宜瓷龙新材料股份有限公司 | Antibacterial and antiviral inorganic ceramic interior wall coating and preparation method thereof |
| CN114163883A (en) * | 2021-12-09 | 2022-03-11 | 中国铝业股份有限公司 | Novel heat-insulating coating of aluminum cell cover plate, coating and preparation method thereof |
| CN114292536A (en) * | 2021-12-31 | 2022-04-08 | 福建建工建材科技开发有限公司 | Inorganic coating with reflection and heat insulation functions |
| CN114292537A (en) * | 2022-02-28 | 2022-04-08 | 陈军 | Elastic waterproof nano coating and preparation method thereof |
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| CN114292536A (en) * | 2021-12-31 | 2022-04-08 | 福建建工建材科技开发有限公司 | Inorganic coating with reflection and heat insulation functions |
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| CN115093729B (en) * | 2022-07-26 | 2024-01-02 | 富思特新材料科技发展股份有限公司 | Self-luminous pollution-resistant fireproof material and preparation method and application thereof |
| CN117229681A (en) * | 2023-08-03 | 2023-12-15 | 深圳标朗环保新材料科技有限公司 | Antirust heat-insulating coating and preparation method and application thereof |
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