CN108610815A - Aerosil composite thermal barrier coatings and preparation method thereof - Google Patents
Aerosil composite thermal barrier coatings and preparation method thereof Download PDFInfo
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- CN108610815A CN108610815A CN201611235103.1A CN201611235103A CN108610815A CN 108610815 A CN108610815 A CN 108610815A CN 201611235103 A CN201611235103 A CN 201611235103A CN 108610815 A CN108610815 A CN 108610815A
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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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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
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- 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
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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Abstract
The present invention provides a kind of aerosil composite thermal barrier coatings, it is prepared by the raw material including the aerosil of special ratios, titanium dioxide, hollow glass micropearl, far-infared ceramic powder, the characteristics of having had both isolation-type, reflection-type, Radiation Heat-insulated Paint, the thermal coefficient of coating can effectively be reduced, reflectivity, the radiance for improving coating simultaneously, realize preferable heat insulation.Preparation method of the present invention is simple, and mild condition is safe, and does not need large scale equipment, is suitble to industrialized production.
Description
Technical field
The present invention relates to aerosils, and in particular to a kind of aerosil composite thermal barrier coatings and its system
Preparation Method.
Background technology
With the continuous development of modern social economy, the consumption of the energy is growing day by day, and wherein building energy consumption about accounts for society
The one third of total energy consumption, therefore building energy conservation is particularly important in terms of Optimization of Energy Saving structure, control energy consumption.It is building
It builds in heat-insulated field, the development and application of novel heat insulation material play considerable effect.Aerosil is one
Nanoporous solid material of the kind with low-density, lower thermal conductivity, high light transmission rate, high porosity and high-specific surface area, bone
Frame is in three-dimensional network shape, nanoscale hole hole is full of in structure, in partiting thermal insulation, environmental protection, medicine, catalysis, building energy conservation, oil
The fields such as work, aerospace show great application potential.As one of following ten big potentiality new materials, silica airsetting
Glue has larger development prospect in heat-insulating field.
Invention content
The purpose of the present invention is to provide a kind of heat insulating coat, the coating be by comprising aerosil, titanium dioxide,
The composite thermal barrier coatings that raw material including hollow glass micropearl and far-infared ceramic powder is prepared can effectively reduce coating
Thermal coefficient, while improving the reflectivity of coating, radiance, realize preferable heat insulation.
Unless otherwise specified, number of the present invention is parts by weight, and the percentage is mass percent.
The object of the present invention is achieved like this：
A kind of heat insulating coat, it is characterised in that：By including aerosil, titanium dioxide and hollow glass micropearl, remote
Raw material including infrared ceramic powder is prepared, wherein aerosil, titanium dioxide, hollow glass micropearl and far infrared pottery
The mass ratio of porcelain powder is 2~7：3~8：3~8：6~16.
In order to improve the filming performance of composite thermal barrier coatings, the raw material for preparing of above-mentioned heat insulating coat further includes appropriate acrylic acid
Resin and water.In heat insulating coat according to the present invention, those skilled in the art can also be according to specific requirement, in this hair
Appropriate functional aid, such as wetting agent, dispersant, antifoaming agent, coalescents are added in bright heat insulating coat raw material；Above-mentioned work(
Energy property auxiliary agent such as wetting agent, dispersant, antifoaming agent, coalescents are clear concept for those of ordinary skill in the art.
In order to further increase the heat insulation of above-mentioned heat insulating coat, above-mentioned heat insulating coat is by including silica airsetting
Raw material including glue, titanium dioxide, hollow glass micropearl, far-infared ceramic powder, acrylic resin, functional aid and water prepare and
At wherein 30~40% acrylic resins, 2~7% aerosils, 3~8% titanium dioxides, 3~8% hollow glass are micro-
Pearl, 6~16% far-infared ceramic powders, surplus are functional aid and water, by percentage to the quality, total amount 100%.
In order to further increase the filming performance of above-mentioned heat insulating coat, above-mentioned heat insulating coat raw material includes that functionality helps
Agent, the wherein dosage of antifoaming agent are the 0.3~1% of total raw material amount, and wetting agent dosage is the 0.1~0.7% of total raw material amount, dispersion
The dosage of agent is the 0.1~0.7% of total raw material amount, and coalescents are the 1.3~2.5% of total raw material amount, by percentage to the quality.
Above-mentioned heat insulating coat is by including aerosil, titanium dioxide, hollow glass micropearl, acrylic resin, wetting
Raw material including agent, dispersant, antifoaming agent, coalescents and water is prepared, wherein 30~40% acrylic resins, 2~7%
Aerosil, 3~8% titanium dioxides, 3~8% hollow glass micropearls, 6~16% far-infared ceramic powders, 0.3~1% disappears
Infusion, 0.1~0.7% wetting agent, 0.1~0.7% dispersant, 1.3~2.5% coalescents；Surplus is water, with quality percentage
Than meter, total amount 100%.
In order to further improve the heat-proof quality of coating, the mass ratio of above-mentioned titanium dioxide and hollow glass micropearl is 1：1.
The heat-proof quality and cost of above-mentioned heat insulating coat in order to balance, the wet-film thickness preferably 50 of above-mentioned heat insulating coat~
200μm。
According to the second aspect of the invention, another object of the present invention is to provide the preparation methods of above-mentioned heat insulating coat.
The present invention is by silicon dioxide aerogel powder, with wetting agent, dispersant and 1/3~1/2 antifoaming agent in deionized water
High speed shearing dispersion obtain aerosil slurry, add titanium dioxide, far-infared ceramic powder, hollow glass micropearl with
And remaining antifoaming agent, it is uniformly dispersed to obtain the compound insulating moulding coating of aerosil.
The preparation method of above-mentioned heat insulating coat, using following steps：
Silica aerogel particles are milled into powder, by wetting agent, dispersant, 1/3~1/2 antifoaming agent addition go from
In sub- water, stirred evenly with the rotating speed of 300~500r/min, stirring 3~after five minutes, silicon dioxide aerogel powder is added, turns
Speed is increased to 1800~2000r/min, its high speed shear is made to disperse aerosil slurry to be prepared in 2~3 hours, with
Rotating speed is reduced afterwards to 600~800r/min, and acrylic resin and coalescents are added, stirs evenly, finally sequentially adds titanium white
Powder, far-infared ceramic powder, hollow glass micropearl and remaining antifoaming agent, are uniformly mixed that obtain aerosil compound
Insulating moulding coating；Coating is uniformly coated on aluminium alloy plate with bar spreader, coating wet film thickness is 120~150 μm or so, from
Drying is conserved under the conditions of so, both.
Advantageous effect：
1, the present invention provides a kind of composite thermal barrier coatings, by the aerosil of special ratios, titanium dioxide, hollow
Raw material including glass microballoon, far-infared ceramic powder is combined, and has had both isolation-type, reflection-type, Radiation Heat-insulated Paint
Feature can effectively reduce the thermal coefficient of coating, while improve the reflectivity of coating, radiance, realize preferable heat-insulated effect
Fruit.
2, the present invention makes full use of the unique nano-pore of aerosil and tridimensional network characteristic, in conjunction with titanium white
The characteristic of powder, hollow glass micropearl and far-infared ceramic powder, composite thermal barrier coatings appearance flawless (the silica airsetting of preparation
Glue, with the increase of aerosil additive amount, the equilibrium temperature presentation of model bottom first reduces the trend risen afterwards, when
When the aerosil of addition is more than certain proportion, coating surface cracks), also soilless sticking phenomenon (titanium white in coating
The solar spectrum reflectivity of powder starts gradually to be incremented by with the increase of titanium dioxide mass fraction, when mass fraction is more than a certain amount of
When, agglomeration takes place in titanium dioxide in the coating, causes the decline of coating reflectivity)；Also substantially reduce coating simultaneously
Thermal coefficient, effectively reduce heat transmission, promote its heat insulation, play the role of improve environment, reduce energy consumption.
3, compared with heat insulating coat in the prior art, the present invention has many advantages, such as thin layer, lightweight, environmental protection.The present invention is not
Only there is low thermal coefficient and high reflectivity and radiance, and heat insulation under the same conditions, take this hair
Bright made heat insulating coat thickness is more frivolous；Likewise, when coating layer thickness is identical, heat insulation of the present invention is more notable,
While Optimization of Energy Saving structure, energy consumption is controlled.
4, it is applied alone aerosil to prepare heat insulating coat, the thermal coefficient of coating can be reduced to a certain degree, enhancing applies
The barrier heat-proof quality of layer is compared with blank model, and aerosil coating can make model bottom temp reduce by 12
℃.The present invention it is compound using the raw material including aerosil, titanium dioxide, hollow glass micropearl, far-infared ceramic powder and
At heat insulating coat, relative to being applied alone aerosil to prepare heat insulating coat, heat-proof quality in the case of same coating layer thickness
More preferably.When addition mass fraction be 5% aerosil, 5% titanium dioxide, 5% hollow glass micropearl and 10%
Infrared ceramic powder when, composite thermal barrier coatings have better heat-proof quality；It is and uncoated when coating wet film thickness is 150 μm
The comparison of blank model, temperature highest can reduce by 14.8 DEG C.
5, preparation method of the present invention is simple, and mild condition is safe, and does not need large scale equipment, is suitble to industry metaplasia
Production.
Description of the drawings
Fig. 1 is the coating model bottom surface temperature variation curve of different quality containing aerosil；
Fig. 2 is the coating model thermal coefficient of different quality containing aerosil；
Fig. 3 is the sunlight reflection collection of illustrative plates of the coating of different quality containing titanium dioxide；
Fig. 4 is different quality containing titanium white powder coating SEM photograph；
Fig. 5 is the coating model bottom surface temperature variation curve of different quality containing titanium dioxide；
Fig. 6 is the coating sunlight reflection collection of illustrative plates of different quality containing hollow glass micropearl；
Fig. 7 is the coating model bottom surface temperature variation curve of different quality containing hollow glass micropearl；
Fig. 8 is the hollow glass micropearl of different ratios and the coating sunlight reflection collection of illustrative plates of titanium dioxide；
Fig. 9 is the hollow glass micropearl of different ratios and the coating model bottom surface temperature variation curve of titanium dioxide；
Figure 10 is the hollow glass micropearl of different ratios and the coating SEM photograph of titanium dioxide；
Figure 11 is influence of the far-infared ceramic powder additive amount to coating infrared emittance；
Figure 12 is the coating model bottom surface temperature variation curve of different quality containing far-infared ceramic powder；
Figure 13 is different-thickness heat insulating coat model temperature variation curve in embodiment 5.
Embodiment
The present invention is specifically described below by embodiment, it is necessary to which indicated herein is that following embodiment is only used
In invention is further explained, it should not be understood as limiting the scope of the invention, person skilled in art can
To make some nonessential modifications and adaptations to the present invention according to aforementioned present invention content.The raw materials used in the present invention and reagent are equal
For commercial product.
Raw material, instrument and reagent
Experiment raw material are water-based acrylic resin, coalescents (Zhuhai Ji Li Chemical Co., Ltd.s)；Hydrophobic type dioxy
SiClx aeroge (Guangdong Alison High-technology Co., Ltd.)；Titanium dioxide (HUNTSMAN)；(U.S. 3M is public for hollow glass micropearl
Department)；Far-infared ceramic powder (rising sun boat mineral products in Lingshou County sell Co., Ltd)；Wetting agent, dispersant (Guangzhou Si Luoke chemistry
Co., Ltd)；Antifoaming agent (Rhodia)；Deionized water (laboratory self-control)；Aluminium alloy plate (commercially available).
Test method of the present invention：Using the thermal coefficient of the thermal conductivity factor instrument testing coating of HOT DISK companies of Sweden.It adopts
With Hitachi, Ltd U-4100 ultraviolet/visible lights/near infrared spectrometer, with the sun light reflection of integral ball testing coating
Rate.Using the HWF-2 type infrared emittance measuring instrument testing coatings of northern Chi Hong Photoelectric Co., Ltd.s in the red of 8~14 mu m wavebands
Outer emissivity.Reference《The metal surfaces HC/T4341-2012 heat-reflecting insulating coating》In method, the heat-insulated effect of testing coating
Fruit.Coating wet film thickness is measured using the QNIX4500 coating thickness detectors of German Knicks.
One-component filler heat insulating coat performance evaluation
Embodiment 1 (aerosil influences the performance of heat insulating coat)
The preparation of coating：
Silica aerogel particles are first milled into powder with planetary ball mill, by 0.5g wetting agents (Silok
7117), 0.5g dispersants (Silok 7195), 0.3g antifoaming agent (681-F) are added in 41g deionized waters, with 500r/min's
Rotating speed stirs evenly, and after stirring 3 minutes, silicon dioxide aerogel powder is added, rotating speed is increased to 1800r/min, makes its high speed
Aerosil slurry (thermal coefficient 0.02Wm is prepared in 3 hours in shearing dispersion-1k-1Silica airsetting
Rubber powder body), rotating speed is then reduced to 700r/min, and 35g acrylic resins and 2g coalescents are added, stir evenly, finally add
The antifoaming agent (681-F) for entering 0.7g, obtains aerosil one-component insulating moulding coating；With bar spreader in aluminium alloy plate
Upper uniformly coating coating, coating wet film thickness are 150 μm or so, and drying is conserved under natural conditions.
In above-mentioned preparation method, select thermal coefficient for 0.02Wm-1k-1Silicon dioxide aerogel powder be heat-insulated original
Material, according to the 0% of total raw material amount, 2%, 3%, 4%, 5%, 6%, 7%, 8% totally 8 groups of experiments prepare, then to accordingly every
Hot coating performance is analyzed.It is obstructed by the coating of infrared lamp simulated solar optical tests difference aerosil additive amount
Heat-proof quality, Fig. 1 is the temperature variation curve of different coating model bottom surface, it can be seen from the figure that uncoated silica gas
The model bottom surface equilibrium temperature of gel heat-insulation coating is 59.2 DEG C, is coated with the model bottom of aerosil heat insulating coat
Equilibrium temperature has different degrees of reduction.With the increase of aerosil additive amount, the equilibrium temperature of model bottom
Presentation first reduces the trend risen afterwards, and when the mass fraction of aerosil is 5%, the heat insulation of coating is best,
The bottom equilibrium temperature of model is 47.2 DEG C at this time.Fig. 2 is different model thermal coefficient change curves, it can be seen from the figure that
When the mass fraction of the aerosil of addition is less than 5%, the thermal coefficient of coating with aerosil increasing
Add and reduce, when mass fraction is equal to 5%, the thermal coefficient of coating is minimum 0.08Wm-1k-1.When silica airsetting
When glue mass fraction is more than 5%, the thermal coefficient of coating increases instead, this may be due to the increasing with aerosil
Add, dispersibility, which declines, to be caused.It was found that, when the aerosil mass fraction of addition is more than 8%, coating table
Face cracks.
Embodiment 2 (titanium dioxide or/and hollow glass micropearl influence the performance of heat insulating coat)
The preparation of coating：
Beaker, shearing rotating speed 700r/min, 0.3g dispersant is added in 40g acrylic resins and 2g coalescents first
(Silok 7195) is then added the antifoaming agent (681-F) of 2.7g titanium dioxides or/and hollow glass micropearl and 0.3g, obtains
Insulating moulding coating；Coating is uniformly coated on aluminium alloy plate with bar spreader, and drying is conserved under natural conditions.
In above-mentioned preparation method, select titanium dioxide for heat-insulated raw material, according to the 0% of total raw material amount, 6%, 8%, 10%,
12%, 14%, 16% totally 7 groups of experiments preparations, then analyze corresponding heat insulating coat performance.Also selection hollow glass is micro-
Pearl is heat-insulated raw material, according to the 0% of total raw material amount, 6%, 8%, 10%, 12%, 14%, 16% totally 7 groups of experiments preparations, then
Corresponding heat insulating coat performance is analyzed.Also simultaneous selection titanium dioxide and hollow glass micropearl are heat-insulated raw material, according to total
The 10% of material quantity prepares heat insulating coat, according to titanium dioxide and hollow glass micropearl mass ratio 2:8、4:6、5:5、6:4、8:2 totally 5
Prepared by group experiment, then analyze corresponding heat insulating coat performance.Experiment has studied titanium dioxide respectively and hollow glass is micro-
The sun reflective character and heat-proof quality of coating prepared by two kinds of reflection fillers of pearl.Fig. 3 is addition different quality containing titanium white
The sunlight of the coating of powder reflects collection of illustrative plates, and as seen from the figure, titanium dioxide has excellent solar spectrum reflection characteristic, the sun of model
Spectral reflectivity starts gradually to be incremented by with the increase of titanium dioxide mass fraction, but when mass fraction is more than 12%, sample applies
The spectral reflectivity of layer decreases instead.Fig. 4 is the microscopic appearance figure of the preferable titanium white powder coating of reflecting properties, can by figure
Know, when the mass fraction of titanium dioxide be less than 12% when, titanium white powder content cannot be uniformly filled into coating, cause its reflectivity compared with
It is low, but when mass fraction is more than 12%, agglomeration takes place in titanium dioxide in the coating, causes under coating reflectivity
Drop.By Fig. 5 different coating bottom temp curves it is found that when titanium dioxide mass fraction is 12%, model bottom temp is minimum
It it is 53 DEG C, compared with blank model, equilibrium temperature is 6.2 DEG C low, and the reflection for further illustrating coating with this condition is special
Property is preferable.
Fig. 6 is the sunlight reflection collection of illustrative plates for the coating for adding different quality containing hollow glass micropearl, can with Fig. 3 comparisons
Know, the solar spectrum reflectivity of hollow glass micropearl model is overall low compared with titanium dioxide, and reflectivity rule is also with its quality
The increase presentation of score first increases the trend subtracted afterwards, and when mass fraction is more than 10%, the spectral reflectivity of sample coatings starts to drop
It is low.Fig. 7 is the bottom temp change curve for adding different quality containing hollow glass micropearl coating model, when hollow glass is micro-
When pearl mass fraction is 10%, minimum 51.4 DEG C of model bottom temp, compared with blank model, equilibrium temperature low 7.8
℃.Hollow glass micropearl is as coating made from filler, and coating is low made from luminance factor titanium dioxide, but its equilibrium temperature
It is lower, it is, due to its boring, to cause it with lower heat conduction system because the hollow structure of hollow glass micropearl causes
Number, further enhances its heat-proof quality.
Low thermal conductivity both with considering the high sun light reflectivity and hollow glass micropearl of titanium dioxide, the two is mixed
It closes and coating is added used as reflection filler.Both determining mass fraction being added is 10%, is added by comparing the two is different
Add ratio, to determine optimum reflection filler additive amount.Table 1 is the different adding proportion values of hollow glass micropearl and titanium dioxide.
The different reflection filler adding proportion values of table 1
Fig. 8 and Fig. 9 is respectively the sunlight reflection collection of illustrative plates and model bottom temp change curve of coating, from figure it is found that
When the amount that hollow glass micropearl and titanium dioxide add is identical, minimum 50.2 DEG C of model bottom equilibrium temperature, sunlight at this time
Reflectivity is not maximum, shows that hollow glass micropearl at this time and titanium dioxide play heat-blocking action, and its equilibrium temperature ratio jointly
The two distinguishes low 1.2 and 3 DEG C when being used alone, more notable to the heat insulation of coating when illustrating that the two is used in mixed way.Figure 10 is
The microscopic appearance figure of coating, as seen from the figure, when the additive amount ratio of hollow glass micropearl and titanium dioxide is 2:8 and 4:It is hollow when 6
Glass microballoon cannot form continuous barrier layer, and the low thermal conductivity advantage having just can not show, and heat insulation is not also shown
It writes.When the additive amount ratio of hollow glass micropearl and titanium dioxide is 5:When 5, hollow glass micropearl forms continuous barrier layer, and
Titanium dioxide is attached to bead surface, can play good sun light reflection effect, it is respective excellent that coating has both fillers
The heat insulation of point, coating is best.It is hollow when continuing the content of raising hollow glass micropearl, while reducing titanium white powder content
Small-scale agglomeration occurs for glass microballoon, and the barrier heat insulation influence of coating becomes smaller, and the ability of reflected sunlight with
The reduction for titanium white powder content continuously decreases, and the temperature of coating model bottom is caused compared with the two ratio to be 5:Want high when 5.
Embodiment 3 (far-infared ceramic powder influences the performance of heat insulating coat)
The preparation of coating：
Beaker, shearing rotating speed 700r/min, 0.3g dispersant is added in 40g acrylic resins and 2g coalescents first
(Silok 7195) is then added 2.7g far-infared ceramic powders and the antifoaming agent (681-F) of 0.3g, obtains insulating moulding coating；With
Bar spreader uniformly coats coating on aluminium alloy plate, and drying is conserved under natural conditions.
In above-mentioned preparation method, select far-infared ceramic powder for heat-insulated raw material, according to the 0% of total raw material amount, 6%, 8%,
10%, 12%, 14%, 16% totally 7 groups of experiments preparations, then analyze corresponding heat insulating coat performance.Experiment uses spoke
Functional stuffing of the far-infared ceramic powder that rate is 0.95 as radiation heat insulation coating is penetrated, different far-infared ceramic powder additive amounts are studied
The infrared emittance of coating, Figure 11 and Figure 12 indicate the coating model of the far-infared ceramic powder of addition different quality containing respectively
Emissivity changes and bottom temp situation of change.As can be seen from Figure 11, with the increase of filer content, the emissivity of coating gradually increases
Greatly, and as the gradual increase emissivity of additive amount improves unobvious.The emissivity of coating is generally held in a higher water
Flat, minimum 0.86 reaches maximum value 0.93, this may be film-forming resin when far-infared ceramic powder additive amount is 14%
With all higher reason of emissivity of far-infared ceramic powder.The high emissivity of coating contributes to coating by heat with the side of heat radiation
Formula scattering is fallen, and the heat insulation for improving coating has larger help.It can be recognized from fig. 12 that the painting of addition far-infared ceramic powder
Layer has certain heat insulation, and with the raising of additive amount, coating model bottom equilibrium temperature continuously decreases.In addition quality point
When several 10%, coating model bottom equilibrium temperature is 5.2 DEG C lower than blank model, when continuing to add far-infared ceramic powder, model
Back temperature is held essentially constant, and coating heat-proof quality is preferable at this time.
The compound heat insulating coat performance evaluation of aerosil
Embodiment 4
5g silica aerogel particles are first milled into powder with planetary ball mill, by 0.5g wetting agents (Silok
7117), 0.5g dispersants (Silok 7195), 0.3g antifoaming agent (681-F) are added in 41g deionized waters, with the left sides 500r/min
Right rotating speed stirs evenly, and after stirring 3 minutes, silicon dioxide aerogel powder is added, and rotating speed is increased to 1800r/min or so,
Its high speed shear is set to disperse aerosil slurry to be prepared in 3 hours, then reduction rotating speed to 700r/min or so, adds
Enter 35g acrylic resins and 2g coalescents, stir evenly, it is empty finally to sequentially add 5g titanium dioxides, 5g far-infared ceramic powders, 5g
The antifoaming agent (681-F) of heart glass microballoon and 0.7g, obtains the compound insulating moulding coating of aerosil；It is coated with bar
Device uniformly coats coating on aluminium alloy plate, and coating wet film thickness is 150 μm or so, and drying is conserved under natural conditions.
Using coating model bottom temp as basis for estimation, with reference to embodiment 4, embodiment is run according to following table 2 parameter
5-13, the percentage composition value of titanium dioxide and hollow glass micropearl is two kinds of fillers by 1 in table:The value being added after the mixing of 1 ratio.
Table 2
As can be seen from Table 2：In very poor R, the value of aerosil dosage column is maximum, therefore, titanium dioxide
Silica aerogel dosage influences maximum in coating formula on the heat-proof quality of the compound heat insulating coat of aerosil, secondly
For the dosage of titanium dioxide and hollow glass micropearl, far-infared ceramic powder influences the heat-proof quality of coating minimum.By a large amount of real
Test and obtain, when addition mass fraction be 5% aerosil, 5% titanium dioxide, 5% hollow glass micropearl and
When 10% infrared ceramic powder, composite thermal barrier coatings have good heat-proof quality.When coating wet film thickness is 150 μm, at this time
The temperature of coating model bottom is 44.4 DEG C, and the blank sample board bottom portion temperature comparisons with uncoated coating, temperature highest can reduce
14.8℃。
Influence of the compound heat insulating coat thickness of aerosil to heat-proof quality
Compound insulating moulding coating (the aerosil of aerosil is prepared with reference to embodiment 4：Titanium dioxide：It is empty
Heart glass microballoon：Far-infared ceramic powder mass ratio is 5:5:5:10), use spreader prepare wet-film thickness for 50,80,100,
150,200 μm of coating, testing coating model equilibrium temperature, test result are as shown in figure 13 after normal temperature cure.
As seen from Figure 13, with the increase of coating layer thickness, the equilibrium temperature of coating model continuously decreases, and coating drops
The amplitude of low temperature is gradually reduced.May be the increase with coating layer thickness, the content of each functional stuffing improves in unit area,
Cause the thermal coefficient of coating to reduce, reflectivity and radiance increase so that coating after optimization with thickness increase, it is heat-insulated
Performance improves.When wet-film thickness is 100,150,200 μm, coating model equilibrium temperature is respectively 44.6,44.2 and 44 DEG C, explanation
When thickness, which reaches a certain level, to be further continued for increasing, the heat-proof quality raising of coating is not notable, this may be due to coating
Thermal coefficient reduces unobvious, caused by sun light reflectivity and radiance are not improved.
Found in the preparation process of heat insulating coat of the present invention, aerosil, titanium dioxide, hollow glass micropearl and
The dosage of infrared ceramic powder is particular about there are prodigious, once control is bad, not only coating shows to be likely to occur crackle, it is also possible to certain
A little substances lead to agglomeration in the coating, to seriously affect the heat insulation of composite thermal barrier coatings.The present invention makes full use of
The unique nano-pore of aerosil and tridimensional network characteristic, in conjunction with titanium dioxide, hollow glass micropearl and far infrared
The characteristics of characteristic of ceramic powder, the composite thermal barrier coatings of preparation have had both isolation-type, reflection-type, Radiation Heat-insulated Paint, appearance
Flawless, also soilless sticking phenomenon in coating, can not only effectively reduce the thermal coefficient of coating, moreover it is possible to improve the reflection of coating
Rate, to reach preferable heat insulation.
Claims (10)
1. a kind of heat insulating coat, it is characterised in that：By including aerosil, titanium dioxide and hollow glass micropearl, remote red
Raw material including outer ceramic powder is prepared, wherein aerosil, titanium dioxide, hollow glass micropearl and far-infrared ceramic
The mass ratio of powder is 2~7：3~8：3~8：6~16.
2. heat insulating coat as described in claim 1, it is characterised in that：The raw material for preparing of the heat insulating coat further includes appropriate propylene
Acid resin and water.
3. heat insulating coat as claimed in claim 1 or 2, it is characterised in that：Appropriate work(can be also added in the heat insulating coat raw material
Energy property auxiliary agent, the functional aid are the combination of one or more of wetting agent, dispersant, antifoaming agent, coalescents.
4. heat insulating coat as claimed in claim 3, it is characterised in that：The heat insulating coat is by including aerosil, titanium
Raw material including white powder, hollow glass micropearl, far-infared ceramic powder, acrylic resin, functional aid and water is prepared,
In 30~40% acrylic resins, 2~7% aerosils, 3~8 % titanium dioxides, 3~8% hollow glass micropearls, 6~16%
Far-infared ceramic powder, surplus are functional aid and water, by percentage to the quality, total amount 100%.
5. heat insulating coat as claimed in claim 4, it is characterised in that：The dosage of the antifoaming agent is the 0.3 ~ 1% of total raw material amount,
Wetting agent dosage is the 0.1~0.7% of total raw material amount, and the dosage of dispersant is the 0.1~0.7% of total raw material amount, and coalescents are
The 1.3~2.5% of total raw material amount, by percentage to the quality.
6. the heat insulating coat as described in claim 3 or 4 or 5 any one, it is characterised in that：The heat insulating coat is by including titanium dioxide
Including silica aerogel, titanium dioxide, hollow glass micropearl, acrylic resin, wetting agent, dispersant, antifoaming agent, coalescents and water
Raw material be prepared, wherein 30~40% acrylic resins, 2~7% aerosils, 4~6 % titanium dioxides, 4~6% is empty
Heart glass microballoon, 6~16% far-infared ceramic powders, 0.3 ~ 0.5% antifoaming agent, 0.1~0.7% wetting agent, 0.1~0.7% dispersant,
1.3~2.5% coalescents；Surplus is water, by percentage to the quality, total amount 100%.
7. the heat insulating coat as described in claim 1,3,4 or 5 any one, it is characterised in that：The titanium dioxide and hollow glass are micro-
The mass ratio of pearl is 1：1.
8. heat insulating coat as claimed in claim 6, it is characterised in that：The mass ratio of the titanium dioxide and hollow glass micropearl is 1：
1。
9. the heat insulating coat as described in claim any one of 1-8, it is characterised in that：The wet-film thickness of the heat insulating coat be 50~
200μm。
10. the preparation method of heat insulating coat as described in claim any one of 1-8, using following steps：
Silica aerogel particles are milled into powder, deionized water is added in wetting agent, dispersant, 1/3~1/2 antifoaming agent
In, it is stirred evenly with the rotating speed of 300 ~ 500r/min, stirring 3 ~ after five minutes, silicon dioxide aerogel powder is added, rotating speed improves
To 1800 ~ 2000 r/min, makes its high speed shear disperse aerosil slurry to be prepared in 2 ~ 3 hours, then reduce
Rotating speed is added acrylic resin and coalescents, stirs evenly to 600 ~ 800 r/min, finally sequentially adds titanium dioxide, remote red
Outer ceramic powder, hollow glass micropearl and remaining antifoaming agent are uniformly mixed and obtain the compound heat-insulated painting of aerosil
Material；Coating is uniformly coated on aluminium alloy plate with bar spreader, coating wet film thickness is 120 ~ 150 μm, is supported under natural conditions
Drying is protected, both.
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| CN201611235103.1A CN108610815A (en) | 2016-12-28 | 2016-12-28 | Aerosil composite thermal barrier coatings and preparation method thereof |
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| CN201611235103.1A CN108610815A (en) | 2016-12-28 | 2016-12-28 | Aerosil composite thermal barrier coatings and preparation method thereof |
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| CN201611235103.1A Pending CN108610815A (en) | 2016-12-28 | 2016-12-28 | Aerosil composite thermal barrier coatings and preparation method thereof |
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| CN115216185A (en) * | 2022-07-08 | 2022-10-21 | 广东广纳新材料有限公司 | Reflective heat-insulation coating, preparation method thereof and reflective heat-insulation composite layer |
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