CN108948886A - A kind of phase-changing and temperature-regulating coating and preparation method thereof - Google Patents
A kind of phase-changing and temperature-regulating coating and preparation method thereof Download PDFInfo
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
Abstract
The invention discloses a kind of phase-changing and temperature-regulating coating and preparation method thereof, graphene oxide water solution is subjected to atomization drying first and thermal expansion is handled, obtain the graphene microballoon with central hole structure, then melt phase-change material and be fully infiltrated into the cavity of graphene microballoon, obtains the phase change microsphere with core-shell structure.The extra phase-change material of phase transformation microsphere surface is removed by the method for filters pressing, is uniformly mixed using the method for mechanical mixture with each component of coating, phase-changing and temperature-regulating coating can be obtained.The present invention greatly reduces the leakage of phase-change material in use, is remarkably improved service life by using graphene hollow sphere coating phase-change materials.The high-termal conductivity of graphene can effectively facilitate the heat exchange of environment and coating, can coating heat storage and release.In addition, graphene itself has highly conductive, antibacterial and far infrared transmission characteristic, it can assign coating a variety of new functions.
Description
Technical field
The invention belongs to paint fields more particularly to a kind of phase-changing and temperature-regulating coating and preparation method thereof.
Background technique
Nowadays, the decoration of traditional coating and simple protective effect can not meet the development of modern industry already, it is required
Modern coatings will not only have decoration or protective effect, also have both other one or more functions, such as heat-insulation and heat-preservation, resistance to height
The warm, burn into of resistance to special media self-cleaning, high-insulativity, high-wearing feature, fire line etc..At this moment, functional special coating is just met the tendency of
And it is raw, with the development of modern science and technology, the requirement to functional coating is also higher and higher, the coating that high-performance is overlapped mutually by
To more and more concerns.Phase-changing and temperature-regulating coating is that have absorption or release amount of heat in phase transition process using phase-change material
And achieve the purpose that temperature adjustment.It is simply mixed however, directly phase-change material is added in formulation for coating material, in use can
There is phase-change material exudation, the defect of phase transition function decaying, it is therefore desirable to by coating, limiting the means such as movement for phase-change material
Firmly it is retained among coating.
Usually there is the disadvantages of heat transfer is slow, temperature adjustment rate is slow in conventional phase-changing and temperature-regulating coating, this is because coating each component and
Phase transformation covering material is not highly heat-conductive material.Graphene as a kind of two-dimentional carbon nanomaterial, because its excellent power, electricity, heat,
The performances such as magnetic, optics, since the advent of the world have received extensive concern.This two dimension heat conducting nanometer material can be effectively to phase transformation material
Material is coated, and provides conductive and heat-conductive channel, thus is a kind of phase-change material lapping of great potential.There are two types of at present
Graphene/phase change composite material preparation thinking of mainstream, one is simply by graphene be used as thermally conductive additive, it is micro- with phase transformation
Capsule is compound with polymer together, as patent 201510690957.8 " a kind of graphene-based heat conductive silica gel phase change composite material and
Preparation method "；Another kind is using graphene coating phase-change materials, such as patent 201711101732.X " modified graphite oxide
The preparation method of the composite phase-change material of alkene cladding " phase-change material coated using surfactant processing graphene oxide.So
And both methods has great defect, the former only improves the thermal conductivity of material entirety, and phase transition performance does not obtain
It is promoted, the latter has used modified graphene and graphene oxide etc. then to coat phase-change material, has not only been difficult to ensure phase-change material
Effective cladding, and material overall thermal conductivity can not be promoted.In addition to this, the introducing of graphene is usually associated with phase-change material
Reduction (the Carbon.2016 of enthalpy of phase change；100:693-702.).Therefore, while realizing effectively cladding, thermal conductivity and not is promoted
Reducing enthalpy of phase change is the key that realize phase-change accumulation energy performance.
Summary of the invention
The purpose of the present invention is aiming at the shortcomings of the prior art, provide a kind of phase-changing and temperature-regulating coating and preparation method thereof.
The purpose of the present invention is what is be achieved through the following technical solutions: a kind of phase-changing and temperature-regulating coating, which is characterized in that include
Following component: graphene phase change microsphere, filler, lotion, dispersing agent, coalescing agent, defoaming agent, thickener, water.The graphene
Phase change microsphere has core-shell structure, and shell is graphene hollow microspheres, and core is phase-change material.Graphene phase change microsphere is in coating
Quality accounting between 5.9%-15.9%.
Further, filler is at least one of kaolin, titanium dioxide, calcium carbonate, montmorillonite and silica, partial size
It is 2-10 μm；The lotion is in styrene-acrylic latex, pure-acrylic emulsion, styrene-butadiene emulsion, acrylate and vinyl acetate emulsion, polyvinyl alcohol and polyethylene glycol
At least one；The dispersing agent is one of sodium polyphosphate, calgon, sodium pyrophosphate, lauryl sodium sulfate；
The thickener is carboxymethyl cellulose；The coalescing agent is benzyl alcohol.
Further, the graphene phase change microsphere is prepared by following steps:
(1) will be dry having a size of 1~50 micron of single-layer graphene oxide dispersion liquid by atomization drying method, it is aoxidized
Graphene microballoon, carbon-to-oxygen ratio are 3~6.
(2) step (1) is obtained graphene oxide microballoon to be placed in tube furnace, rises to 1000 DEG C or more, heat preservation 1h is obtained
Graphene hollow microspheres.Heating rate is in 5 DEG C/min or more.
(3) 100 mass parts phase-change materials and 5~10 mass parts graphene hollow microspheres are mixed, is heated to phase-change material
10~60min is stirred after thawing, stands vacuum defoamation 1h, and graphene phase change microsphere is then obtained by filters pressing, cooling.
Further, the atomization drying temperature of the step (1) is 130~200 DEG C.
Further, the phase transition temperature of the phase-change material of the step (3) is between 10~60 DEG C.
Further, the filters pressing temperature of the step (3) is higher than the phase transition temperature of phase-change material.
A kind of preparation method of phase-changing and temperature-regulating coating, this method are as follows: proportionally weigh raw material, by lotion, dispersing agent, fill out
Material, water and graphene phase change microsphere are added in reaction kettle and are stirred；Defoaming agent, coalescing agent and half is then sequentially added to increase
It thick dose, stirs evenly.Remaining thickener is ultimately joined, stirs evenly and phase-changing and temperature-regulating coating can be obtained.
The beneficial effects of the present invention are:
(1) present invention prepares graphene hollow microspheres by the technique for being spray-dried and thermally expanding, and passes through the phase in melting
Become in material and sufficiently impregnates inside and outer surface that infiltration can make phase-change material be distributed in graphene hollow sphere.Pattern is obtained ahead of time
Controllable graphene hollow microspheres can ensure that the cladding to phase-change material with size, and due to thermal reduction, graphene oxide table
The group in face removes, and defect is repaired, and has higher mechanical performance and heating conduction, therefore compared to interfacial assembly, emulsification
Etc. forms it is more stable efficiently.
(2) it in pressure-filtering process, since graphene hollow microspheres have splendid resistance against compression and dimensional stability, is pressing
The space that power acts between lower microballoon is extruded, and uncoated phase-change material is caused to be removed, and internal phase-change material is able to
It is basic to retain, can analogy at " one basket of basketball " form.It is micro- that the graphene phase transformation with core-shell structure can be obtained after the cooling period
Ball.
(3) graphene phase change microsphere can be dispersed in coating, and tiny balloon is more readily formed compared to sheet dispersion
Conductive and heat-conductive network, therefore the thermal conductivity of coating significantly rises after addition graphene phase change microsphere, therefore can realize that fast speed heat is rung
It answers.In addition, present inventors have unexpectedly found that the cladding of graphene does not have a negative impact substantially to phase-change material enthalpy of phase change, or even have
Certain enhancing, so as to effectively promote the temperature adjusting performance of coating.
(4) addition of graphene imparts the new functions such as coating far infrared transmission, antibacterial, antistatic, it can be achieved that functionality
Superposition, application surface is more extensive, and scientific and technological added value is higher.Phase change microsphere is dispersed among coating, and durable type is good.
(5) the actual interpolation amount of graphene seldom (10% or less), has the advantage of high performance-price ratio.
(6) production method is simple, and the equipment being related to is existing conventional production equipment, the addition pair of graphene phase change microsphere
The influence of Paint preparation technology is little, it is easy to accomplish industrialized production.
To sum up, have high thermal conductivity, hypotonic leakage, fast-response, temperature adjusting performance good using the phase-changing and temperature-regulating coating that this method obtains
Advantage, and due to the addition of graphene, coating also has many new functions such as far infrared transmission, antibacterial, antistatic, has
Effect realizes the effect of multi-functional superposition, promotes the scientific and technological content and value of coating products.
Detailed description of the invention
Fig. 1 is the preparation flow figure through phase-changing and temperature-regulating coating of the present invention.
Fig. 2 is the scanning electron microscope (SEM) photograph of the graphene hollow microspheres prepared through the embodiment of the present invention 1.
Specific embodiment
The present invention is specifically described below by embodiment, the present embodiment is served only for doing further the present invention
It is bright, it should not be understood as limiting the scope of the invention, those skilled in the art makes one according to the content of foregoing invention
A little nonessential changes and adjustment belong to protection scope of the present invention.
Embodiment 1:
(1) will be dry having a size of 1~5 micron of single-layer graphene oxide dispersion liquid by atomization drying method, it is aoxidized
Graphene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 130 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
30min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 1 part of benzyl alcohol and 0.5 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.Graphene hollow microspheres it is microcosmic
Pattern is as shown in Figure 2.
Embodiment 2:
(1) will be dry having a size of 20~30 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 130 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
60min is sufficiently stirred after change, stands vacuum defoamation 1h, with the filters pressing at 50 DEG C, obtains graphene phase change microsphere after cooling.
(4) by 30 parts of styrene-acrylic emulsions, 0.6 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；Then sequentially add 0.5 part of defoaming agent, 3 parts of benzyl alcohols and 0.2 part of carboxymethyl cellulose
Element stirs evenly.0.2 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 3:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 130 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
20min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 60 parts of titanium dioxides, 170 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 2 parts of benzyl alcohols and 0.3 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.3 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 4:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 6.Atomization drying temperature is 200 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
20min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 50 parts of titanium dioxides, 200 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 2 parts of benzyl alcohols and 0.3 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.3 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 5:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 140 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 10 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
50min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
(4) by 40 parts of pure-acrylic emulsions, 0.3 part of sodium polyphosphate, 50 parts of calcium carbonate, 20 parts of silica, 130 parts of water and 25
Part graphene phase change microsphere, which is added in reaction kettle, to be stirred；Then sequentially add 1 part of defoaming agent, 2 parts of benzyl alcohols and 0.3 part of carboxylic
Methylcellulose stirs evenly.0.3 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 6:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
30min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C, cooling obtains graphene phase change microsphere.
(4) by 40 parts of styrene-acrylic emulsions, 1 part of sodium polyphosphate, 60 parts of calcium carbonate, 40 parts of montmorillonites, 250 parts of water and 25 parts of stones
Black alkene phase change microsphere is added in reaction kettle and is stirred；Then sequentially add 2 parts of defoaming agents, 3 parts of benzyl alcohols and 0.5 part of carboxymethyl
Cellulose stirs evenly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 7:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
10min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
(4) by 20 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 10 parts of calcium carbonate, 100 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；Then sequentially add 0.5 part of defoaming agent, 1 part of benzyl alcohol and 0.2 part of carboxymethyl cellulose
Element stirs evenly.0.2 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Comparative example 1: the coating of graphene phase change microsphere is not added.
Comparative example 2:
(1) by atomization drying method that 100~500 nanometers of size of single-layer graphene oxide dispersion liquid is dry, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 150 DEG C.
Remaining is the same as embodiment 1, specific performance such as table 1, shown in 2.
Comparative example 3:
(1) by atomization drying method that 90~100 microns of size of single-layer graphene oxide dispersion liquid is dry, it is aoxidized
Graphene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 150 DEG C.
Remaining is the same as embodiment 1, specific performance such as table 1, shown in 2.
Comparative example 4:
(2) by atomization drying method that 42~50 microns of size of single-layer graphene oxide dispersion liquid is dry, it is aoxidized
Graphene microballoon, carbon-to-oxygen ratio 10.Atomization drying temperature is 220 DEG C.
Remaining is the same as embodiment 1, specific performance such as table 1, shown in 2.
Comparative example 5:
(1) by atomization drying method that 42~50 microns of size of single-layer graphene oxide dispersion liquid is dry, it is aoxidized
Graphene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 150 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 20 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
60min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 50 DEG C obtains graphene phase change microsphere after cooling.
Remaining is the same as embodiment 1, specific performance such as table 1, shown in 2.
Comparative example 6:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
40min is sufficiently stirred after change, stands vacuum defoamation 1h, it is micro- to obtain graphene phase transformation then by the filters pressing at 50 DEG C, after cooling
Ball.
(4) 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 5 parts of graphene phase transformations are micro-
Ball is added in reaction kettle and is stirred；1 part of defoaming agent, 1 part of benzyl alcohol and 0.5 part of carboxymethyl cellulose then are sequentially added, is stirred
It mixes uniformly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Comparative example 7:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 10 DEG C/min rises to 1300 DEG C, heat preservation
1h obtains graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 40 DEG C melts eicosane
40min is sufficiently stirred after change, stands vacuum defoamation 1h, is directly used after cooling.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 1 part of benzyl alcohol and 0.5 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Specific performance such as table 1, shown in 2.
The performance of table 1 embodiment and comparative example relevant parameter and phase change microspherea
aThe enthalpy of phase change of eicosane is 200.6J g-1
The performance of table 2 embodiment and comparative example relevant parameter and coating
| Maximum circumstance of temperature difference (DEG C) | Thermal conductivity (Wm-1K-1) | Antibiotic property (%) | Sheet resistance (Ω) | |
| Embodiment 1 | 4.5 | 0.84 | 83 | 107 |
| Embodiment 2 | 4.8 | 0.87 | 85 | 107 |
| Embodiment 3 | 5.2 | 0.91 | 88 | 107 |
| Embodiment 4 | 5.9 | 0.86 | 91 | 106 |
| Embodiment 5 | 6.7 | 0.95 | 87 | 106 |
| Embodiment 6 | 6.5 | 0.76 | 87 | 107 |
| Embodiment 7 | 7.9 | 1.12 | 94 | 105 |
| Embodiment 8 | 5.6 | 1.02 | 82 | 107 |
| Embodiment 9 | 4.8 | 0.98 | 81 | 107 |
| Comparative example 1 | 0 | 0.21 | 0 | 1013 |
| Comparative example 2 | 0.8 | 0.43 | 66 | 1010 |
| Comparative example 3 | 0 | 0.46 | 70 | 109 |
| Comparative example 4 | 0 | 0.47 | 73 | 108 |
| Comparative example 5 | 3.1 | 0.78 | 79 | 107 |
| Comparative example 6 | 3.3 | 0.82 | 78 | 1010 |
| Comparative example 7 | 4.7 | 0.77 | 72 | 109 |
It can be seen that the graphene oxide ruler at 1~50 micron from the comparison of embodiment 1,2,3 and comparative example 1,2,3
The enthalpy of phase change of gained composite phase-change microballoon is higher in very little range, and does not leak.It is (right when graphene oxide is undersized
Ratio 2), gained graphene oxide microballoon can form hole on tiny balloon surface in thermal expansion, to can not effectively wrap up
Phase-change material；When graphene oxide is oversized (comparative example 2), since size steric hindrance is significant, graphene sky can not be effectively formed
Heart microballoon, can not effective coating phase-change materials.
As can be seen that the control of graphene oxide carbon-to-oxygen ratio is relatively more reasonable 3~6 from embodiment 3,4 and comparative example 4, but
When being that carbon-to-oxygen ratio is excessively high, surface group quantity is few, it is difficult to make graphene oxide microsphere expansion (comparative example 4).It can not effectively wrap up
Shape-changing material.
As can be seen that the mass ratio of graphene hollow sphere and phase-change material is 5~10 from embodiment 3,5 and comparative example 5:
100 the most rationally.If the mass ratio of graphene hollow sphere is too low, most of phase-change material is not played a role, leads to efficiency
It reduces, cost.If the mass ratio of graphene hollow sphere is excessive (comparative example 5), phase-change material cannot be sufficient filling with into all
In microballoon, so that phase-changing and temperature-regulating reduced performance.
As can be seen that mass ratio of the graphene phase change microsphere in coating is in 5.9- from embodiment 3,6,7 and comparative example 6
15.9% performance is best.Many performances such as phase-changing and temperature-regulating embody not significant (comparative example when graphene phase change microsphere additive amount is too low
6) uniformity of coating and film forming decline to a great extent, and after adding too much, and it is impaired to apply item gesture.
As can be seen that filters pressing can effectively exclude the free paraffins on the outside of graphene microballoon from embodiment 3 and comparative example 7,
Avoid the leakage of paraffin.And effective accounting decline of the graphene in coating in the case where no filters pressing step, so that leading
Heat, a series of performance declines such as conduction.
Embodiment 8:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 8 DEG C/min rises to 1400 DEG C, keeps the temperature 1h
Obtain graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 60 DEG C makes phase change paraffin
40min is sufficiently stirred after thawing, stands vacuum defoamation 1h, the then filters pressing at 70 DEG C, cooling obtains graphene phase change microsphere.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 1 part of benzyl alcohol and 0.5 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Embodiment 9:
(1) will be dry having a size of 42~50 microns of single-layer graphene oxide dispersion liquid by atomization drying method, obtain oxygen
Graphite alkene microballoon, carbon-to-oxygen ratio 3.Atomization drying temperature is 160 DEG C.
(2) the graphene oxide microballoon that step (1) obtains is placed in tube furnace, 5 DEG C/min rises to 1000 DEG C, keeps the temperature 1h
Obtain graphene hollow microspheres.
(3) 100 mass parts eicosanes and 5 mass parts graphene hollow microspheres are mixed, being heated to 30 DEG C melts nonadecane
40min is sufficiently stirred after change, stands vacuum defoamation 1h, the then filters pressing at 40 DEG C, cooling obtains graphene phase change microsphere.
(4) by 30 parts of styrene-acrylic emulsions, 0.3 part of sodium polyphosphate, 70 parts of titanium dioxides, 180 parts of water and 25 parts of graphene phase transformations
Microballoon is added in reaction kettle and is stirred；1 part of defoaming agent, 1 part of benzyl alcohol and 0.5 part of carboxymethyl cellulose then are sequentially added,
It stirs evenly.0.5 part of carboxymethyl cellulose is ultimately joined, phase-changing and temperature-regulating coating can be obtained in stirring 30min.
Through above step, phase-changing and temperature-regulating coating, specific performance such as table 1, shown in 2 are obtained.
Claims (7)
1. a kind of phase-changing and temperature-regulating coating, which is characterized in that include following component: graphene phase change microsphere, filler, lotion, dispersion
Agent, coalescing agent, defoaming agent, thickener, water.The graphene phase change microsphere has core-shell structure, and shell is that graphene is hollow
Microballoon, core are phase-change material.Graphene phase change microsphere is in the quality accounting in coating between 5.9%-15.9%.
2. phase-changing and temperature-regulating coating according to claim 1, which is characterized in that filler be kaolin, titanium dioxide, calcium carbonate,
At least one of montmorillonite and silica, partial size are 2-10 μm；The lotion is styrene-acrylic latex, pure-acrylic emulsion, butylbenzene
At least one of lotion, acrylate and vinyl acetate emulsion, polyvinyl alcohol and polyethylene glycol；The dispersing agent is sodium polyphosphate, hexa metaphosphoric acid
One of sodium, sodium pyrophosphate, lauryl sodium sulfate；The thickener is carboxymethyl cellulose；The coalescing agent is
Benzyl alcohol.
3. phase-changing and temperature-regulating coating according to claim 1, which is characterized in that the graphene phase change microsphere passes through following step
Suddenly it is prepared:
(1) will be dry having a size of 1~50 micron of single-layer graphene oxide dispersion liquid by atomization drying method, obtain graphite oxide
Alkene microballoon, carbon-to-oxygen ratio are 3~6.
(2) step (1) is obtained graphene oxide microballoon to be placed in tube furnace, rises to 1000 DEG C or more, heat preservation 1h obtains graphite
Alkene tiny balloon.Heating rate is in 5 DEG C/min or more.
(3) 100 mass parts phase-change materials and 5~10 mass parts graphene hollow microspheres are mixed, is heated to phase-change material thawing
10~60min is stirred afterwards, stands vacuum defoamation 1h, and graphene phase change microsphere is then obtained by filters pressing, cooling.
4. phase-changing and temperature-regulating coating according to claim 3, which is characterized in that the atomization drying temperature of the step (1) is
130~200 DEG C.
5. phase-changing and temperature-regulating coating according to claim 3, which is characterized in that the phase transformation of the phase-change material of the step (3)
Temperature is between 10~60 DEG C.
6. phase-changing and temperature-regulating coating according to claim 3, which is characterized in that the filters pressing temperature of the step (3) is higher than phase
Become the phase transition temperature of material.
7. a kind of preparation method of phase-changing and temperature-regulating coating described in claim 1, which is characterized in that this method are as follows: proportionally
Raw material is weighed, lotion, dispersing agent, filler, water and graphene phase change microsphere are added in reaction kettle and are stirred；Then successively add
Enter defoaming agent, coalescing agent and half thickener, stirs evenly.Remaining thickener is ultimately joined, stirring evenly can be obtained
Phase-changing and temperature-regulating coating.
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