CN109337468B - Hydrophobic powder falling prevention coating for aerogel felt surface, preparation method and application - Google Patents
Hydrophobic powder falling prevention coating for aerogel felt surface, preparation method and application Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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Abstract
The invention discloses a hydrophobic powder falling prevention coating for the surface of an aerogel felt, which comprises a water repellent, and also discloses a preparation method and application of the coating.
Description
Technical Field
The invention relates to a preparation method of a hydrophobic anti-dropping powder coating, in particular to a hydrophobic anti-dropping powder coating used on the surface of a silicon dioxide aerogel felt.
Background
The current global energy background is characterized by a need to reduce energy consumption, delay fossil fuel shortages and slow greenhouse gas emissions. The heat insulation performance of the heat insulation material is the most effective way for reducing energy consumption, the heat conductivity coefficient of the traditional heat insulation material is higher, and the application of the heat insulation material in the fields of indoor heat insulation and the like is limited by increasing the thickness of the heat insulation material to improve the heat insulation performance. The silica aerogel has a continuous, three-dimensional and skeleton-connected network structure, is a low-density nano porous amorphous heat-insulating material, has a skeleton size of nano level and a skeleton thickness of not more than 100nm, so that heat flow generates unidirectional transmission similar to one-dimensional heat conduction in the aerogel skeleton, the volume occupied by solids in the aerogel structure is usually less than 5%, and the proportion occupied by solid heat transfer in an internal heat transfer mode is greatly reduced. BMW company wraps the aerogel layer on the water-cooling radiator to improve the cold resistance of the automobile. The aerogel material aerospace suit developed by Aspen Aerogels in America can bear ultralow temperature of minus 130 ℃, so that the personal safety of astronauts is protected. The aerogel has excellent heat insulation performance and great significance for reducing energy consumption.
The good characteristics of high porosity, low thermal conductivity and low dielectric constant make the aerogel widely used in more fields. However, the silica aerogel has large brittleness due to the characteristics of the inorganic nano-skeleton structure, and has poor bending resistance and friction resistance, so that the industrial application is difficult to realize. The strength of the aerogel felt prepared by the composite fiber material is obviously improved. However, the addition of the fiber material also causes the silica aerogel on the surface of the aerogel felt to easily fall off, particularly, in the transportation and construction processes, the surfaces of the aerogel felt rub against each other, a large amount of dust falls off to form raise dust, so that the environment is obviously polluted, meanwhile, certain hidden dangers exist for the health of constructors, and the continuous falling of aerogel powder finally possibly reduces the heat insulation performance of the aerogel fiber felt.
In order to solve the problem, the patent CN106838547A hopes to fix the particles on the fiber material by means of dipping or spraying the adhesive on the surface of the fiber felt and then spraying the nano-pore heat insulating material particles on the surface of the adhesive, but this method obviously cannot solve the brittleness problem of the aerogel particles, and the adhered nano-pore heat insulating material particles have obvious pores, resulting in poor overall heat conductivity of the material; patent CN103192582A discloses a method for bonding inorganic fire-proof cloth and aerogel material by using inorganic or organic adhesive to prevent the surface of aerogel material from falling powder. However, the existence of the pores of the inorganic fireproof cloth can not solve the problem fundamentally, in addition, the coated material is difficult to bend, the edges, gaps and the like of the material are difficult to wrap, and the thickness and the density of the material are obviously increased. Patents CN103589258A and CN106631154A have prepared a coating and a composite material respectively to improve the problem of powder falling of aerogel-based materials, but two methods all adopt aqueous film forming materials and additives, after being applied on the surface of aerogel, have obvious hydrophilicity, when being stored and constructed in humid environment for a long time, the water vapor or water drops in the air are easily adsorbed on the surface of coating, and gradually enter into the pores of aerogel, resulting in the stability reduction of aerogel, in addition, in these two methods, all need to be milled by a ball mill, resulting in the complex production process, the production cycle is longer, the container is difficult to clean. The application patent CN107337420A provides a method for manufacturing a hydrophobic calcium silicate heat-insulating spray paint for building heat preservation, the hydrophobic calcium silicate is mixed with white latex, wallpaper glue powder, reinforcing fibers and a flame retardant, the system is only suitable for being sprayed on the surfaces of buildings such as wall surfaces and roofs, and is not suitable for the surfaces of aerogel felts needing to be bent, and the preparation process is complex and is not beneficial to industrial production. The hydrophobic powder falling prevention coating for the surface of the aerogel felt is developed, the problem of powder falling of the aerogel felt is solved, the hydrophobic performance is greatly improved, the operation is convenient and fast, and the cost is low.
Disclosure of Invention
The invention aims to provide a coating for the surface (especially a bent surface) of an aerogel felt, which can prevent silica aerogel on the surface of the aerogel felt from falling off and falling off.
In order to achieve the purpose, the invention adopts the following specific scheme:
a hydrophobic anti-dropping powder coating for the surface of aerogel felt comprises a hydrophobic agent.
Preferably, the first and second liquid crystal materials are,
the hydrophobic anti-falling powder coating for the surface of the aerogel felt further comprises a film forming substance, a cross-linking agent, a film forming auxiliary agent, a compatibilizer, a flame retardant, a defoaming agent and water.
The hydrophobic anti-falling powder coating for the surface of the aerogel felt comprises the following components in parts by weight:
60-80 parts of film forming material;
0.5-15 parts of cross-linking agent;
4-12 parts of a film-forming auxiliary agent;
0.2-10 parts of a compatibilizer;
40-70 parts of flame retardant;
0.3-2.5% of defoaming agent;
40-180 parts of water;
0.2-60 parts of water repellent.
In order to improve the hydrophobic rate of the hydrophobic anti-dropping powder coating to more than 98.0 percent after application, the water repellent is one or more of an organic silicon water repellent, powder and particles treated by the organic silicon water repellent;
in order to improve the hydrophobic rate of the hydrophobic anti-falling powder coating to more than 98.0 percent after application, the organosilicon hydrophobic agent is one or more of hexamethyldisiloxane, hexamethyldisilazane, dimethyldiethoxysilane, monomethyldiethoxy-monohydroxysilane, methyltriethoxysilane, methyltrimethoxysilane, polymethyltriethoxysilane, polymethyltrimethoxysilane, methylhydroxy silicone oil, hydroxyl-containing hydrogen silicone oil, methyltrifluoropropyl silicone oil or methylvinyl silicone oil.
The compatibilizer is one or more of gamma-methacryloxypropyltrimethoxysilane, vinyl trimethoxysilane and vinyl triethoxysilane.
The film forming material is one or more of acrylic resin, polysiloxane, phenolic resin, urea resin, polyvinyl chloride resin, perchloroethylene resin, vinyl chloride vinylidene chloride copolymer resin, nitrocellulose and butyl acetate cellulose.
The cross-linking agent is one or more of methyl potassium silicate and methyl sodium silicate.
The film forming auxiliary agent is one or more of alcohol ester dodeca, ethylene glycol propyl ether, ethylene glycol butyl ether, propylene glycol propyl ether, propylene glycol butyl ether, diethylene glycol ethyl ether, diethylene glycol propyl ether, diethylene glycol butyl ether, dipropyl alcohol butyl ether, diethylene glycol ethyl ether acetate and diethylene glycol butyl ether acetate.
The flame retardant is one or more of aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate, starch, melamine, urea, molybdenum trioxide and ammonium octamolybdate.
The defoaming agent is one or more of n-octanol, a water-based defoaming agent F-127 and polyethylene glycol ether.
The film forming material is one or more of acrylic resin, polysiloxane, phenolic resin, urea resin, polyvinyl chloride resin, perchloroethylene resin, vinyl chloride vinylidene chloride copolymer resin, nitrocellulose and butyl acetate cellulose;
the cross-linking agent is one or more of methyl potassium silicate and methyl sodium silicate.
The invention also provides a preparation method of the powder falling prevention coating for the surface of the aerogel felt, which has the characteristics of simple process, convenient construction and low cost.
A preparation method of the powder falling prevention coating for the surface of the aerogel felt comprises the following steps:
(1) adding one or more of film forming substances, a film forming auxiliary agent, a cross-linking agent, a compatibilizer and water into a container, uniformly stirring, and reacting for 1 hour;
(2) and sequentially adding a flame retardant, a defoaming agent and a water repellent, and uniformly stirring again to obtain the hydrophobic anti-dropping powder coating for the surface of the aerogel felt.
The invention also provides application of the powder falling prevention coating for the surface of the aerogel felt in spraying or brushing on the surface of the aerogel felt.
By adopting the technical scheme, the method has the following beneficial effects:
firstly, the water repellent is used in the powder dropping prevention coating, and the coating is applied to the surface of the aerogel felt, so that the silicon dioxide aerogel in the processing, transporting and bending processes of the surface of the aerogel felt can be effectively prevented from dropping and dropping powder, namely the coating is 250-350 g/m2After being brushed or sprayed on the surface of the aerogel felt and dried, the powder dropping rate is reduced to below 0.5 percent from the original 1.5 to 2 percent, and when the aerogel felt is bent for 50 times at 180 degrees, the powder dropping performance of the coating is basically not influenced, and the load of unit area is 500N/m2The powder dropping rate is less than or equal to 1 percent after 1000 times of friction.
And after the water repellent agent in the coating is applied to the surface of the aerogel felt, the water repellent rate can reach more than 98.0 percent, and compared with the existing powder falling prevention coating, the water repellent rate can be improved by more than 150 percent. The aerogel felt sprayed or brushed with the hydrophobic powder falling prevention coating can be stored in a humid environment or transported and constructed in rainy days without influencing the heat conductivity coefficient.
Finally, the coating of the invention has little effect on the aerogel felt, and after the coating is coated on the surface of the aerogel felt and dried, the thermal conductivity coefficient is improved by no more than 5 percent compared with that of the untreated aerogel felt.
The invention is further illustrated by the following specific embodiments.
Detailed Description
Example 1
The invention relates to a hydrophobic anti-falling powder coating for the surface of aerogel felt, which comprises the following components in parts by weight:
the film forming material, the film forming assistant, the cross-linking agent, the compatibilizer and the water are added into a container according to the proportion in the formula of the embodiment 1 and are stirred uniformly to react for 1 hour. And then adding a flame retardant, a defoaming agent and a water repellent in sequence and stirring uniformly again to obtain the hydrophobic anti-dropping powder coating for the surface of the aerogel felt.
The hydrophobic anti-dusting coating prepared in example 1 was uniformly spread on the surface of aerogel felt at a coating dosage of 280g/m2The thickness is increased to 0.01mm-0.35mm, and the hydrophobic anti-powder falling aerogel felt is obtained after the constant temperature curing is carried out for 15 minutes at 70 ℃.
The hydrophobic, dust shedding prevention aerogel blankets prepared in example 1 were compared to untreated aerogel blankets for performance as shown in table 1 below.
Performance comparison Table 1
Example 2
The invention relates to a hydrophobic anti-falling powder coating for the surface of aerogel felt, which comprises the following components in parts by weight:
the film forming material, the film forming assistant, the cross-linking agent, the compatibilizer and the water are added into a container according to the proportion in the formula of the embodiment 2 and are stirred uniformly to react for 1 hour. And then adding a flame retardant, a defoaming agent and a water repellent in sequence and stirring uniformly again to obtain the hydrophobic anti-dropping powder coating for the surface of the aerogel felt.
The hydrophobic anti-dropping powder coating prepared in the example 2 is evenly scraped on the surface of the aerogel felt, and the dosage of the coating is 280g/m2The thickness is increased to 0.01mm-0.35mm, and the hydrophobic anti-powder falling aerogel felt is obtained after the constant temperature curing is carried out for 15 minutes at 70 ℃.
The hydrophobic, dust shedding prevention aerogel blankets prepared in example 2 were compared to untreated aerogel blankets and the performance was shown in table 2 below.
Performance comparison Table 2
Example 3
The invention relates to a hydrophobic anti-falling powder coating for the surface of aerogel felt, which comprises the following components in parts by weight:
the film forming material, the film forming assistant, the cross-linking agent, the compatibilizer and the water are added into a container according to the proportion in the formula of the embodiment 3 and are stirred uniformly to react for 1 hour. And then adding a flame retardant, a defoaming agent and a water repellent in sequence and stirring uniformly again to obtain the hydrophobic anti-dropping powder coating for the surface of the aerogel felt.
The hydrophobic anti-dusting coating prepared in example 3 was uniformly spread on the surface of aerogel felt at a coating dosage of 280g/m2The thickness is increased to 0.01mm-0.35mm, and the hydrophobic anti-powder falling aerogel felt is obtained after the constant temperature curing is carried out for 15 minutes at 70 ℃.
The hydrophobic, dust shedding prevention aerogel blankets prepared in example 3 were compared to untreated aerogel blankets and the performance was shown in table 3 below.
Performance comparison Table 3
In addition, when the surfaces of the aerogel felts prepared in the examples 1 to 3 are bent for 50 times at 180 degrees, the powder dropping performance of the coating is basically not influenced, and the load per unit area is 500N/m2The powder dropping rate is less than or equal to 1 percent after 1000 times of friction.
The above cases are merely specific embodiments of the present invention, and the technical features of the present invention are not limited thereto. From a comparison of the properties in the three cases, tables 1, 2 and 3, it can be seen that:
after the hydrophobic powder dropping prevention coating for the surface of the aerogel felt is scraped on the surface of the aerogel felt, compared with an untreated aerogel felt, the heat conductivity coefficient value is basically kept consistent, powder on the surface of the aerogel felt does not drop, and the hydrophobic performance is greatly improved. Therefore, the hydrophobic powder falling prevention coating not only solves the powder falling problem of the aerogel felt, but also ensures the stable performance of the aerogel felt product during long-term storage and transportation in a humid environment and construction in rainy days due to the introduction of the hydrophobic agent.
The above embodiments are merely preferred embodiments of the present disclosure, which are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present disclosure, should be included in the scope of the present disclosure.
Claims (3)
1. The preparation method of the powder dropping preventing coating for the surface of the aerogel felt is characterized by comprising the following steps of
(1) Adding a film forming substance, a film forming auxiliary agent, a cross-linking agent, a compatibilizer and water into a container, uniformly stirring, and reacting for 1 hour; wherein, the film forming material accounts for 60 to 80 weight portions, the film forming additive accounts for 4 to 12 weight portions, the cross-linking agent accounts for 0.5 to 15 weight portions, the compatibilizer accounts for 0.2 to 10 weight portions, and the water accounts for 40 to 180 weight portions; the film-forming material is acrylic resin and polysiloxane; the cross-linking agent is one or more of methyl potassium silicate and methyl sodium silicate; the compatibilizer is one or more of Y-methacryloxypropyltrimethoxysilane, vinyl trimethoxysilane and vinyl triethoxysilane;
(2) sequentially adding 40-70 parts by weight of flame retardant, 0.3-2.5 parts by weight of defoaming agent and 0.2-60 parts by weight of water repellent, and uniformly stirring again to obtain the hydrophobic anti-falling powder coating for the surface of the aerogel felt; wherein the water repellent is an organic silicon water repellent.
2. A method of preparing the powder drop prevention coating for aerogel blanket surfaces as defined in claim 1, wherein: the organosilicon water repellent is one or more of hexamethyldisiloxane, hexamethyldisilazane, dimethyldiethoxysilane, monomethyldiethoxymonohydroxysilane, methyltriethoxysilane, methyltrimethoxysilane, polymethyltriethoxysilane, polymethyltrimethoxysilane, methylhydroxysilicon oil, hydroxyhydrosilicon oil, methyltrifluoropropyl silicone oil and methylvinyl silicone oil.
3. Use of an aerogel dusting prevention coating prepared according to the method of claim 1 to spray or brush on the surface of an aerogel blanket.
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| CN112999988B (en) * | 2019-12-18 | 2022-09-20 | 航天特种材料及工艺技术研究所 | Powder-falling-preventing wave-transmitting aerogel and preparation method and application thereof |
| CN111851070A (en) * | 2020-07-07 | 2020-10-30 | 巩义市泛锐熠辉复合材料有限公司 | Heat-insulating flame-retardant sheet and preparation method thereof |
| CN114806325A (en) * | 2022-03-21 | 2022-07-29 | 河南普力特克新材料有限公司 | Encapsulation flame-retardant coating for aerogel and production process thereof |
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|---|---|---|---|---|
| CN103589258A (en) * | 2013-10-16 | 2014-02-19 | 纳诺科技有限公司 | Aerogel coating and production method and application thereof |
| CN105348936A (en) * | 2015-11-25 | 2016-02-24 | 三棵树涂料股份有限公司 | Hydrophobic elastic waterborne emulsion paint and preparation method thereof |
| CN106631154A (en) * | 2016-11-24 | 2017-05-10 | 纳诺科技有限公司 | Non-shedding aerogel composite material and production technique thereof |
| CN106700773A (en) * | 2016-12-01 | 2017-05-24 | 湖北硅金凝节能减排科技有限公司 | Anti-dusting coating and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589258A (en) * | 2013-10-16 | 2014-02-19 | 纳诺科技有限公司 | Aerogel coating and production method and application thereof |
| CN105348936A (en) * | 2015-11-25 | 2016-02-24 | 三棵树涂料股份有限公司 | Hydrophobic elastic waterborne emulsion paint and preparation method thereof |
| CN106631154A (en) * | 2016-11-24 | 2017-05-10 | 纳诺科技有限公司 | Non-shedding aerogel composite material and production technique thereof |
| CN106700773A (en) * | 2016-12-01 | 2017-05-24 | 湖北硅金凝节能减排科技有限公司 | Anti-dusting coating and preparation method thereof |
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