CN116875124A - Aerogel nanoparticle-based heat insulation coating and preparation method thereof - Google Patents
Aerogel nanoparticle-based heat insulation coating and preparation method thereof Download PDFInfo
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Classifications
-
- 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
-
- 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
- C09D7/43—Thickening agents
-
- 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
-
- 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
- C09D7/65—Additives macromolecular
-
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The application relates to the field of heat-insulating protective materials, and particularly discloses a heat-insulating coating based on aerogel nanoparticles and a preparation method thereof. The aerogel nanoparticle-based heat insulation coating comprises the following components in parts by weight: 5-30 parts of polymer resin emulsion and hydrophobic SiO 2 10-50 parts of aerogel, 1-5 parts of surfactant, 1-5 parts of thickener and 10-30 parts of water; the surfactant is at least one of PO-EO block polyether PE6100, PO-EO block polyether PE 6400 and PO-EO block polyether PE 6800; the thickener comprises at least one of polysaccharide and protein. The application can effectively reduce the heat insulation performance of the heat insulation medium caused by the heat bridge effect of the polymer resin emulsionInfluence, reduces the influence on the strength of the coating, and simultaneously meets the environmental requirements of current green building materials, energy conservation and emission reduction.
Description
Technical Field
The application relates to the field of heat-insulating protective materials, in particular to a heat-insulating coating based on aerogel nano particles and a preparation method thereof.
Background
The heat insulating paint is one kind of functional paint with the features of heat insulation, waterproof, antirust, anticorrosive, short construction period and fast effect. Aerogel is widely used in the fields of heat insulation, catalysis, environmental remediation and the like due to its ultra-low thermal conductivity and open pore structure. Wherein the heat preservation and insulation are SiO 2 Maximum field of application of aerogel and in limited space, siO 2 Aerogel is the most desirable insulating material.
However, the conventional coating layer using the polymer resin emulsion as the main matrix component has compact structure, obvious thermal bridge effect and good heat conduction, and the added aerogel nano particles and the heat insulation coating layer of other heat insulation media cannot exert the maximum heat insulation performance. In order to solve the above-mentioned problems, conventional heat insulating materials generally foam polymer resin emulsions with a surfactant such as an accelerator or a foaming agent.
However, a large amount of foaming agent is used, so that the environment requirements of current green building materials, energy conservation and emission reduction are not met, and the coating can have an excessive negative effect on mechanical properties such as bonding strength and the like.
Disclosure of Invention
The application provides a heat insulation coating based on aerogel nano particles and a preparation method thereof. The heat-insulating coating can effectively reduce the influence of the heat-insulating effect of the polymer resin emulsion on the heat-insulating medium, reduce the influence on the bonding strength of the coating, and simultaneously meet the environmental requirements of current green building materials, energy conservation and emission reduction.
In a first aspect, the present application provides an aerogel nanoparticle-based thermal insulation coating, which adopts the following technical scheme:
the aerogel nanoparticle-based heat insulation coating comprises the following components in parts by weight: 5-30 parts of polymer resin emulsion and hydrophobic SiO 2 10-50 parts of aerogel, 1-5 parts of surfactant, 1-5 parts of thickener and 10-30 parts of water; the surfactant is at least one of PO-EO block polyether PE6100, PO-EO block polyether PE 6400 and PO-EO block polyether PE 6800; the thickener comprises at least one of polysaccharide and protein.
By adopting the technical scheme, the blending of the thickener and the polymer resin emulsion can obtain the modified polymer resin emulsion precursor with low flow property and high viscosity, and the polymer resin emulsion precursor can form a uniform micron/millimeter pore structure. Meanwhile, under the action of the surfactant of the application, the hydrophobic SiO 2 Aerogel can be introduced into the gas-liquid interface of the modified polymer resin emulsion precursor to form a uniformly dispersed fluffy structure; on the one hand hydrophobic SiO 2 Aerogel is used as a heat insulation material, is uniformly dispersed in a coating system, and can provide good heat insulation performance for the coating. In another aspect, the hydrophobic SiO of the present application 2 Aerogel can also be used as a stabilizer in the system of the application, regulate and control the time of delaying the Orshi ripening, and utilize hydrophobic SiO 2 The nano-pore structure of the aerogel itself and the extremely low surface energy stabilize the micro/millimeter pore structure of the polymer resin emulsion. Furthermore, the hydrophobic SiO of the present application 2 Additive amount of aerogelThe usage amount of the thickener is combined, so that the long-acting stability of a gas-liquid interface is effectively maintained, meanwhile, the multistage pore structure grading of nanometer-micrometer-millimeter scale is provided, and the heat bridge effect caused by the compact structure of the polymer resin emulsion in the coating is greatly reduced. Furthermore, the polymer resin emulsion precursor and the hydrophobic SiO of the application 2 The interface between the aerogel is rough, has stronger acting force, and effectively improves the hydrophobicity SiO 2 Dispersibility and uniformity of aerogel in resin system, and hydrophobic SiO 2 The cross-linking points between the aerogel and the polymer resin emulsion can also stabilize hydrophobic SiO 2 The porosity of the aerogel increases the stability of the coating system.
In addition, for the coating system of the application, it is sufficiently viscous and the liquid phase largely belongs to the structure of the film, so that the liquid phase does not break down the hydrophobic SiO due to its surface tension 2 The pore structure of the aerogel effectively reduces SiO due to hydrophobicity 2 Hydrophobic SiO from aerogel feed 2 The aerogel has reduced heat conducting property. And the heat-insulating material SiO 2 Aerogel particles are of a nanoscale hydrophobic porous structure, so that water is not easy to absorb, and the problem that the traditional heat insulation material is corroded and falls off in the later period due to water absorption and damp is solved.
Meanwhile, the coating can be prepared at normal temperature, and has excellent construction performance at normal temperature, and the heat-insulating coating not only reduces the influence on the bonding strength of the coating, but also meets the environmental requirements of current green building materials, energy conservation and emission reduction.
Optionally, the thickener comprises at least one of sodium alginate, guar gum, gum arabic, pectin, carrageenan, whey protein, nanocellulose, and chitin.
By adopting the technical scheme, the thickener can make the polymer resin emulsion precursor well form a uniform and stable micron/millimeter pore structure, and can better assist the hydrophobic SiO 2 The aerogel works, and the thickener belongs to a bio-based natural substance while effectively reducing the thermal bridge effectThe method is green and environment-friendly.
Optionally, the hydrophobic SiO 2 Aerogel has particle diameter of 10nm-200nm and density of 0.05g/cm 3 -0.15g/cm 3 。
In a second aspect, the application provides a preparation method of an aerogel nanoparticle-based heat insulation coating, which adopts the following technical scheme:
a preparation method of a heat insulation coating based on aerogel nano particles comprises the following steps:
(1) Adding a thickening agent into water, uniformly mixing and removing bubbles;
(2) Adding the liquid in the step (1) into the polymer resin emulsion, uniformly mixing, and regulating the pH value to be 4-6;
(3) Adding a surfactant into the liquid in the step (2), and uniformly mixing;
(4) To hydrophobic SiO 2 Adding aerogel into the liquid in the step (3), and uniformly mixing to obtain the heat-insulating coating.
By adopting the technical scheme, the surfactant disclosed by the application is a polyether nonionic surfactant, and the polyether nonionic surfactant is a common surfactant with excellent performance. More importantly, for the coating system of the present application, the use of three surfactants, PO-EO block polyether PE6100, PO-EO block polyether PE 6400, PO-EO block polyether PE6800, can better achieve the desired hydrophobicity of SiO 2 The purpose of introducing the aerogel into the gas-liquid interface of the polymer resin emulsion; on the one hand, the lipophilic groups of PO-EO block polyether PE6100, PO-EO block polyether PE 6400 and PO-EO block polyether PE6800 can well attract hydrophobic SiO 2 An aerogel; on the other hand, these three surfactants can also act well on the coating system according to the application, the hydrophobic SiO being 2 The aerogel is uniformly and stably introduced into the gas-liquid interface of the polymer resin emulsion; further utilizing hydrophobically modified SiO 2 Aerogel nano particles are used as interface stable particles, and the gas-liquid interface of the modified polymer resin emulsion precursor is stabilized through the self high surface energy and complex surface state structure, so that the solid-liquid-gas three-phase structure is formedPhase structure Pickering emulsion. On the one hand, the nano solid particles in the three-phase arrangement structure can be continuously and dynamically rearranged until the resin is solidified on the basis of the Pickering structure of the nano particles, so that the cracking tendency of the foam film is reduced; on the other hand, the addition of the nano solid particles can cause the increase of the viscosity and the reduction of the fluidity of the liquid, reduce the liquid discharge speed, improve the stability of the foam, form an irreversible foam structure and improve the stability and the long-acting performance of the foam structure.
Optionally, the stirring time in the step (2) is 5-20min, and the rotating speed is 500-2500rpm. The stirring time of the step (3) is 5-20min, and the rotating speed is 500-2000rpm. In the step (4), hydrophobic SiO is added within 5-30min 2 The aerogel is added to the liquid in the step (3) in batches, and then stirred for 10-15min at a rotating speed of 100-500rpm. In the step (2), the pH regulator is glacial acetic acid.
By adopting the technical scheme, the proper stirring time and stirring speed are beneficial to forming uniform and stable micron/millimeter pore structure of the modified polymer resin emulsion precursor, and are beneficial to hydrophobic SiO 2 Aerogels function in the coating systems of the present application. The application effectively solves the problems of unstable bubble structures introduced in the conventional coating high-speed dispersion process and damage to aerogel nano structures caused by high shear force by using a low-speed stirring mode at normal temperature and normal pressure.
In summary, the application has the following beneficial effects:
1. in the presence of the thickener, surfactant and the like according to the present application, hydrophobic SiO 2 The aerogel stabilizes a gas-liquid interface in a foaming structure of the polymer resin through self high surface energy and a complex surface state structure, so that Pickering emulsion with a solid-liquid-gas three-phase structure is formed; the stability and the long-acting performance of the foaming structure are improved. Furthermore, the liquid phase in the application does not break down hydrophobic SiO 2 The pore structure of the aerogel can further relatively seal the hydrophobic SiO 2 Pore structure of aerogel using hydrophobic SiO 2 Aerogel particles as core insulating filler, micron-millimeter scale combined with polymer resinThe pore structure is constructed to form a millimeter-micrometer-nanometer multi-stage pore structure, so that the defects of high thermal bridge effect, high heat conductivity and poor heat insulation performance caused by a compact structure of polymer resin in the conventional coating are overcome, the problem of large temperature gradient caused by poor constant temperature protection effect on a base material due to high heat conductivity of the conventional heat insulation protective coating is further solved, the problem of paint film cracking is also solved, the heat insulation effect is greatly improved, and the temperature difference cracking damage is effectively reduced.
2. The application introduces hydrophobic SiO at the gas-liquid interface of polymer resin emulsion 2 The aerogel nanoparticles effectively reduce collapse of the pore bubble structure caused by severe change of surface tension in the curing and drying processes, and the nanoparticles serve as a stabilizer to greatly improve the stability of the pore bubble structure and improve the long-acting stability of the foaming resin structure in the curing and drying stages.
3. The preparation process of the heat-insulating coating provided by the application effectively solves the problems of unstable bubble structures introduced and damage to aerogel nano structures caused by high shear force in the high-speed dispersion process of the conventional coating by using a low-speed stirring mode at normal temperature and normal pressure.
4. The polymer resin emulsion provided by the application realizes that a micron-millimeter pore structure can be formed in the resin through directional regulation and control of surface tension, and solves the problem that the overall density of a conventional thermal insulation coating is greatly reduced by introducing hollow microspheres, sepiolite, asbestos fibers and the like; meanwhile, the existence of an interface with weaker bonding strength between the polymer resin emulsion and the heat insulation filler is reduced, the influence on the bonding strength of the coating is effectively reduced, and potential safety hazards such as falling off in the later service process are avoided.
Drawings
FIG. 1 is a schematic diagram of the paint according to example 1 of the present application.
FIG. 2 is a microscopic image of the coating used to embody example 1.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
The embodiment provides a heat insulation coating based on aerogel nanoparticles, which comprises the following components:
5-30 parts of polymer resin emulsion, 10-50 parts of hydrophobic SiO2 aerogel, 1-5 parts of surfactant, 1-5 parts of thickener and 10-30 parts of water.
Wherein, the water is deionized water; the polymer resin emulsion was a ceramic AC261 acrylic emulsion, and the polymer resin emulsion in the comparative example of the present application was also a ceramic AC261 acrylic emulsion.
The surfactant in this example is at least one of the PO-EO block polyether PE6100, PO-EO block polyether PE 6400, and PO-EO block polyether PE6800 of Basoff.
Hydrophobic SiO 2 Aerogel is commercially available, its particle size is 10nm-200nm, and its density is 0.05g/cm 3 -0.15g/cm 3 。
The thickener is a bio-based natural polysaccharide or protein, and further preferably, the thickener in this embodiment comprises at least one of sodium alginate, guar gum, gum arabic, pectin, carrageenan, whey protein, nanocellulose, and chitin, and is analytically pure.
The embodiment also provides a preparation method of the aerogel nanoparticle-based heat insulation coating, which comprises the following steps:
a preparation method of a heat insulation coating based on aerogel nano particles comprises the following steps:
(1) Adding a thickening agent into water, uniformly mixing and removing bubbles;
(2) Adding the liquid in the step (1) into the polymer resin emulsion, uniformly mixing, and regulating the pH value to be 4-6; further, the pH regulator is glacial acetic acid; the stirring time of the step (2) is 5-20min, and the rotating speed is 500-2500rpm.
(3) Adding a surfactant into the liquid in the step (2), and uniformly mixing; further, the stirring time in the step (3) is 5-20min, and the rotating speed is 500-2000rpm.
(4) Adding the hydrophobic SiO2 aerogel into the liquid in the step (3), and mixingAnd (5) uniformly obtaining the heat-insulating coating. Further, in the step (4), the hydrophobic SiO is added within 5 to 30min 2 The aerogel is added to the liquid in the step (3) in batches, and then stirred for 10-15min at a rotating speed of 100-500rpm.
The following is described by way of specific examples:
example 1
Example 1 provides an aerogel nanoparticle-based thermal barrier coating comprising the following components:
20g of polymer resin emulsion, hydrophobic SiO 2 10g of aerogel, 1g of surfactant, 1g of thickener and 10g of water.
The surfactant is PO-EO block polyether PE 6400.
The thickener is nanocellulose 3w,3w has the meaning: the molecular weight of the nanocellulose is 3 ten thousand; at the same time the nanocellulose used in the comparative example was also nanocellulose 3w.
Example 1 also provides a method for preparing an aerogel nanoparticle-based thermal insulation coating, comprising the steps of:
(1) Adding a thickening agent into deionized water, uniformly mixing and removing bubbles;
(2) Adding the liquid in the step (1) into the polymer resin emulsion, stirring for 10min at 500rpm, uniformly mixing, and regulating the pH value to 5.5 by using glacial acetic acid serving as a pH value regulator.
(3) And (3) adding a surfactant into the liquid in the step (2), stirring for 10min at a rotating speed of 500rpm, and uniformly mixing.
(4) Hydrophobic SiO was added within 15min 2 And (3) adding aerogel into the liquid in the step (3) in batches, stirring for 10min again, wherein the rotating speed is 100rpm, and uniformly mixing to obtain the heat-insulating coating.
Examples 2 to 10
Examples 2-10 differ from example 1 in that: the raw materials or the preparation process parameters are different, and are specifically shown in tables 1 and 2.
TABLE 1 parameter tables of examples 1-6 (usage units: g; time units: min; rotation speed units: rpm)
TABLE 2 parameter tables of examples 7-10 (usage units: g; time units: min; rotation speed units: rpm)
Comparative example
Comparative example 1
Comparative example 1 and example 3 differ in that: no addition of hydrophobic SiO 2 The preparation method of the aerogel and the heat insulation coating of the comparative example 1 comprises the following steps:
(1) Adding a thickening agent into deionized water, uniformly mixing and removing bubbles;
(2) Adding the liquid in the step (1) into the polymer resin emulsion, stirring for 10min at 500rpm, uniformly mixing, and regulating the pH value to 5.5 by using glacial acetic acid serving as a pH value regulator.
(3) And (3) adding a surfactant into the liquid in the step (2), stirring for 10min at a rotating speed of 500rpm, and uniformly mixing to obtain the heat-insulating coating.
Comparative example 2
Comparative example 2 and example 3 differ in that: no thickener or water was added. A method for preparing the heat insulating coating of comparative example 2, comprising the steps of:
(1) The pH value of the polymer resin emulsion is adjusted to 5.5 by glacial acetic acid which is a pH value regulator.
(2) And (3) adding a surfactant into the liquid in the step (1), stirring for 10min at a rotating speed of 500rpm, and uniformly mixing.
(3) Hydrophobic SiO was added within 15min 2 And (3) adding aerogel into the liquid in the step (2) in batches, wherein the adding amount of the aerogel is not more than one tenth of the whole mass of the system each time, stirring for 10 minutes again, and uniformly mixing at the rotating speed of 100rpm to obtain the heat-insulating coating.
Comparative example 3
Comparative example 3 discloses a heat-insulating coating material comprising 20g of polymer resin emulsion, hydrophobic SiO, as a heat-insulating filler by adding hollow microspheres 2 10g of aerogel, 1g of surfactant and 20g of hollow microspheres. The surfactant is PO-EO block polyether PE 6400; the hollow microsphere is produced by new material limited company of Zhengzhou holy hollow microsphere, and the particle size range is 40-100 mu m. The preparation method of the heat preservation and heat insulation coating comprises the following steps:
(1) The pH value of the polymer resin emulsion is adjusted to 5.5 by glacial acetic acid which is a pH value regulator.
(2) And (3) adding a surfactant into the liquid in the step (1), stirring for 10min at a rotating speed of 500rpm, and uniformly mixing.
(3) Hydrophobic SiO was added within 30min 2 Adding aerogel into the liquid in the step (3) in batches, stirring for 15min again, wherein the rotation speed is 200rpm, and uniformly mixing, wherein the addition amount of the aerogel is not more than one tenth of the whole mass of the system.
(4) And adding the hollow microspheres into the mixture, stirring for 10 minutes at a rotating speed of 1000rpm, and uniformly mixing to obtain the heat-insulating coating.
Comparative example 4
Comparative example 4 and example 3 differ in that: the surfactant is triethanolamine.
Comparative example 5
Comparative example 5 and example 3 differ in that: the thickener is BaSO 4 。
Comparative example 6
Comparative example 6 discloses a coating comprising the following components: 0.2g of nanocellulose, 20g of polymer resin emulsion, 6400 g of PO-EO block polyether PE, 10g of heavy calcium carbonate and 20g of deionized water. The preparation method of the coating in the comparative example 6 comprises the following steps:
(1) Adding nanocellulose into deionized water, uniformly mixing and removing bubbles, wherein the nanocellulose is nanocellulose 3w;
(2) And (3) adding the liquid in the step (1) into the polymer resin emulsion, stirring for 15min at 2000rpm, and uniformly mixing.
(3) And (3) adding a surfactant into the liquid in the step (2), stirring for 10min at 2000rpm, and uniformly mixing.
(4) Adding heavy calcium carbonate into the liquid in the step (3), stirring for 45min at 2500rpm, and uniformly mixing to obtain the conventional heat-insulating coating.
Comparative example 7
Comparative example 7 differs from example 3 in that: the amount of thickener was 20g, hydrophobic SiO 2 The aerogel was used in an amount of 5g.
Comparative example 8
Comparative example 8 provides a thermal barrier coating:
(1) 5g of foaming agent AOS is added into 20g of polymer resin emulsion, the stirring time is 10min, the rotating speed is 1000rpm, the mixture is uniformly mixed, and the pH value is adjusted to 5.5 by utilizing glacial acetic acid serving as a pH value regulator.
(2) Adding 1g of surfactant PO-EO block polyether PE 6400 into the liquid in the step (1), stirring for 10min at 500rpm, and uniformly mixing to obtain the heat-insulating coating.
(43) SiO is made of 2 And (3) adding aerogel nano particles into the liquid in the step (3), wherein the adding amount of each time is not more than 1/10 of the whole volume mass of the system, adding the aerogel nano particles within 15 minutes, stirring the mixture for 10 minutes again, and uniformly mixing the mixture at the rotating speed of 100rpm to obtain the heat-insulating coating.
Comparative example 9
Comparative example 9 differs from example 3 in that: the rotational speed of step (2) was 3000rpm.
Comparative example 10
Comparative example 10 and example 3 differ in that: the rotational speed of step (4) was 1500rpm.
And (3) performance detection:
(1) The adhesive strength (MPa) of the coating obtained in examples and comparative examples was measured with reference to GB/T25261-2018, reflective insulation coating for construction.
(2) The density (g/cm) of the coatings obtained in the examples and comparative examples was determined by measuring the dry coating density with reference to GB/T9272-2007 color paint and varnish 3 ) And (5) testing.
(3) The heat-insulating coating of the embodiment and the comparative example is uniformly coated on the surface of a substrate, and the heat-insulating coating is obtained after the substrate is dried for 24 hours at normal temperature. Referring to GB/T25261-2018 reflective heat-insulating paint for building, the heat-insulating coating is subjected to heat conductivity coefficient (W/(mK) and heat-insulating temperature difference (DEG C) test, wherein the test condition is that the ambient temperature of a hot surface is 80 ℃ and the ambient temperature of a cold surface is 25 ℃, and the dry film thickness of the coating is 10mm.
The results of the above tests are shown in tables 3 and 4
Table 3 performance test table of examples
Table 4 comparative example performance test table
The heat insulation performance of the coating of the embodiment of the application is well improved through the performance discovery of the conventional coating of the application and the conventional coating of the comparative example 6; next, it was found that the heat insulating coating material of the examples of the present application was more excellent in heat insulating performance and better in coating adhesive strength than those of comparative examples 3 and 8 in which other heat insulating fillers were added or foaming agents were used to improve the heat insulating performance of the coating material. And it can be found by examining FIGS. 1 and 2 that the hydrophobic SiO in the present application 2 Aerogel is uniformly and stably introduced into the gas-liquid interface of a coating system, hydrophobic SiO2 aerogel particles are used as core heat insulation filler, and the micron-millimeter pore structure of polymer resin is combined to construct millimeter-micron-nanometer multipleThe hierarchical pore structure overcomes the defects of high thermal bridge effect, high heat conductivity coefficient and poor heat insulation performance of the conventional coating due to the compact structure of the polymer resin.
Performance data for comparative example 3 and comparative example 1, it was found that hydrophobic SiO was not used 2 Aerogel, comparative example 1, has significantly reduced insulation properties, indicating hydrophobic SiO 2 The addition of aerogel is important to the thermal insulation properties of the coating. Further comparing example 2 with example 1, hydrophobic SiO 2 The increased amount of aerogel used, which resulted in a decrease in strength and a small increase in thermal insulation performance for example 2, suggests that the hydrophobic SiO is 2 The introduction of aerogel, the coating density becomes smaller, causing a decrease in strength. However, the comparison reveals that the hydrophobic SiO of example 2 2 The aerogel was used in a much greater amount than in example 1, as a rule, in hydrophobic SiO 2 The aerogel should greatly improve the heat insulation of the coating by virtue of its own heat insulation performance, but the heat insulation performance of example 2 is improved as compared with that of example 1, but the improvement is not much, which means that the auxiliary effect of the thickener and the surfactant is not needed, the hydrophobic SiO 2 Aerogels do not perform well.
Further, examples 7 to 9, which are increased in the amount of the surfactant, the amount of the thickener, and the amounts of the surfactant and the thickener, respectively, compared with example 2, have been found that the heat insulating properties of examples 7 and 8 are further improved, but the heat insulating properties of example 9 are most significantly improved, and the mechanical properties are improved to some extent; this demonstrates that the surfactant and thickener have a certain coordination in the coating system of the present application, the blending of the thickener and the polymer resin emulsion can obtain a modified polymer resin emulsion precursor with low flow property and large viscosity, the polymer resin emulsion precursor can form a uniform micron/millimeter pore structure, and the surfactant is hydrophobic SiO 2 Aerogel is uniformly and stably introduced into the gas-liquid interface of polymer resin emulsion, so that hydrophobically modified SiO is utilized 2 The aerogel nano particles are used as interface stable particles, so that the stability and the long-acting performance of the foaming structure are improved; at the same time, the thickener promotes the polymer resin emulsionLiquid precursor and hydrophobic SiO 2 The aerogel has stronger acting force, so that the hydrophobicity SiO is effectively improved 2 Dispersibility and uniformity of aerogel in resin system, and hydrophobic SiO 2 The cross-linking points between the aerogel and the polymer resin emulsion can also stabilize hydrophobic SiO 2 Pores of the aerogel. Furthermore, under the multiparty cooperation of the application, the coating has good heat insulation performance and good mechanical property.
Comparative example 3 and comparative example 2 found that the absence of a thickener has a great effect on the heat insulating properties of the coating, indicating that the thickener and hydrophobic SiO 2 Aerogel also has an accelerating effect on the heat insulating property of the coating, and observing the property data of comparative example 5 shows that the heat insulating property of the final coating is poor without using the thickener of the present application. In addition, in combination with the performance data of comparative example 7, it was found that thickener and hydrophobic SiO 2 The limitations of aerogel usage are important to the performance of the coating, otherwise the thermal insulation properties of the coating are not only poor, but also have a greater negative impact on the strength of the coating. Meanwhile, the performance data of comparative example 3 and comparative example 4 show that the kind of surfactant has a certain influence on the heat insulating performance of the coating, and the surfactant performance in the examples of the present application is superior.
Further comparing example 3 with example 2, it was found that there was some increase in the amount of both thickener and surfactant in example 3, wherein the density of example 3 did not change much and the strength was reduced by a small amount. In general, the thickener promotes the formation of a uniform micron/millimeter pore structure in the polymer resin emulsion precursor, and thus the density of the coating should be small, but in practice the density of example 3 does not vary much because of the absence of hydrophobic SiO 2 Since the aerogel used as an interfacial stabilizer failed to maintain the stability of the pore structure, the density of example 3 was not changed much, and the heat insulation performance was also reduced to a small extent. Further, example 10 compares to example 3, hydrophobic SiO 2 Aerogel has increased certain usage amount, and the heat insulation performance is improved, which indicates that the hydrophobic SiO 2 Aerogel is matched with thickening agent and surfactant, and is used for polymerThe micron/millimeter pore structure of the resin emulsion precursor has a stabilizing effect. .
Example 4 the amount of polymer resin emulsion was increased compared to example 3 and the hydrophobic SiO 2 The aerogel usage was reduced and the insulation effect of example 4 was found to be significantly reduced, but the strength was improved, indicating that the thermal bridge effect affected the insulation performance of the coating by excessive use of the emulsion.
In combination with the detection results of comparative example 9 and comparative example 10, it was found that the stirring condition of the materials during the preparation of the paint also affects the performance of the paint, and the specific expression is as follows: if the stirring speed is too high, step (2) has a negative effect on the heat insulating properties of the coating, which may be caused by the fact that the stirring speed is too high, so that the polymer resin emulsion precursor cannot form a uniform micron/millimeter pore structure. In addition, the too high stirring speed in the step (4) also affects the performance of the coating, probably because the too high stirring speed affects the hydrophobicity of SiO 2 The aerogel is introduced into the gas-liquid interface of the coating system, thereby influencing the subsequent hydrophobicity SiO 2 The stabilization of the pore structure of the coating system by the aerogel.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The aerogel nanoparticle-based heat insulation coating is characterized by comprising the following components in parts by weight: 5-30 parts of polymer resin emulsion and hydrophobic SiO 2 10-50 parts of aerogel, 1-5 parts of surfactant, 1-5 parts of thickener and 10-30 parts of water; the surfactant is at least one of PO-EO block polyether PE6100, PO-EO block polyether PE 6400 and PO-EO block polyether PE 6800; the thickener comprises at least one of polysaccharide and protein.
2. The aerogel nanoparticle-based thermal insulation coating of claim 1, wherein the thickener comprises at least one of sodium alginate, guar gum, gum arabic, pectin, carrageenan, whey protein, nanocellulose, chitin.
3. The aerogel nanoparticle-based thermal barrier coating of claim 1, wherein the hydrophobic SiO 2 Aerogel has particle diameter of 10nm-200nm and density of 0.05g/cm 3 -0.15g/cm 3 。
4. A method for preparing the aerogel nanoparticle-based thermal insulation coating as claimed in any one of claims 1 to 3, comprising the steps of:
(1) Adding a thickening agent into water, uniformly mixing and removing bubbles;
(2) Adding the liquid in the step (1) into the polymer resin emulsion, uniformly mixing, and regulating the pH value to be 4-6;
(3) Adding a surfactant into the liquid in the step (2), and uniformly mixing;
(4) To hydrophobic SiO 2 Adding aerogel into the liquid in the step (3), and uniformly mixing to obtain the heat-insulating coating.
5. The method for preparing an aerogel nanoparticle-based thermal insulation coating according to claim 4, wherein the stirring time in the step (2) is 5-20min, and the rotation speed is 500-2500rpm.
6. The method for preparing an aerogel nanoparticle-based thermal insulation coating according to claim 4, wherein the stirring time in the step (3) is 5-20min, and the rotation speed is 500-2000rpm.
7. The method for preparing an aerogel nanoparticle-based thermal insulation coating according to claim 4, wherein in the step (4), the hydrophobic SiO is added within 5-30min 2 The aerogel is added into the liquid in the step (3) in batches,then stirring for 10-15min at 100-500rpm.
8. The method of claim 4, wherein in step (2), the pH adjustor is glacial acetic acid.
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| US20050282022A1 (en) * | 2004-06-16 | 2005-12-22 | Degussa Ag | Coating formulation for improving surface properties |
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| CN112280397A (en) * | 2020-10-29 | 2021-01-29 | 纳诺科技有限公司 | Aerogel coating and preparation method thereof |
| CN115611288A (en) * | 2022-10-19 | 2023-01-17 | 江苏丰彩节能科技有限公司 | Closed silica aerogel microsphere and thermal insulation coating containing same |
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| WO1996000750A1 (en) * | 1994-06-28 | 1996-01-11 | Ppg Industries, Inc. | Surfactants for incorporating silica aerogel in polyurethane foams |
| US20050282022A1 (en) * | 2004-06-16 | 2005-12-22 | Degussa Ag | Coating formulation for improving surface properties |
| CN102459079A (en) * | 2009-04-27 | 2012-05-16 | 卡博特公司 | Aerogel compositions and methods of making and using them |
| CN112280397A (en) * | 2020-10-29 | 2021-01-29 | 纳诺科技有限公司 | Aerogel coating and preparation method thereof |
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