CN114854375A - Winter energy-releasing and summer energy-storing composite phase-change material, production method and application thereof - Google Patents
Winter energy-releasing and summer energy-storing composite phase-change material, production method and application thereof Download PDFInfo
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- 239000012782 phase change material Substances 0.000 title claims abstract description 37
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Civil Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a winter energy-releasing summer energy-storing composite phase-change material which comprises, by mass, 40-60 parts of modified composite phase-change paraffin, 10-15 parts of nano silicon dioxide, 5-10 parts of activated carbon, 2-5 parts of polypropylene glycol methyl ether acetate and 5-10 parts of light calcium carbonate; the modified composite phase-change paraffin is obtained by sequentially carrying out oxidation reaction and esterification reaction on a mixture of high-melting-point phase-change paraffin and low-melting-point phase-change paraffin. The invention utilizes the characteristic that a specific phase change substance releases heat energy and absorbs heat energy in different temperature intervals, and forms a composite phase change material which is stable in chemical property, insoluble in water, resistant to high temperature, ultraviolet, oxidation and aging after being treated by a certain physical and chemical process, and the composite phase change material is added into a pavement asphalt mixture according to a certain proportion, thereby realizing the effects of releasing energy below the freezing point in winter and storing energy above 40 ℃ in summer on the premise of not influencing various pavement performances of the asphalt pavement.
Description
Technical Field
The invention relates to a winter energy-releasing and summer energy-storing composite phase-change material, a production method and application thereof.
Background
The asphalt pavement is widely applied to urban roads and highway trunks and is a high-grade pavement with the largest paving area in China at present. In summer, the solar heat radiation intensity is high, the sunshine duration is long, the temperature of the asphalt pavement is easily increased, the friction between tires and the ground when the automobile runs at high speed, and the temperature is also increased due to the exhaust emission. Because the asphalt pavement is black, the absorptivity of the asphalt pavement to solar heat radiation reaches 0.85-0.95. At high temperatures, the asphalt pavement may have reduced resistance to deformation and may be susceptible to rutting, hugging, or even shifting under the load of the vehicle. When the temperature is lower than 30 ℃, large ruts are not generated generally; the temperature exceeds 38 ℃ and then the track depth is very large; the temperature continuously exceeds 40 ℃, the road surface can be seriously damaged by rutting, and the danger of tire burst can be caused by the increase of the air pressure in the tire due to the friction between the road surface and the tire. In daytime, the temperature of the asphalt pavement is much higher than that of the bare soil surface. Thus, the high temperature of the asphalt pavement has many adverse effects. Particularly, in cities with dense buildings and large heat emission by manpower, the asphalt pavement can aggravate the heat island effect of the cities, and the asphalt volatilizes harmful gases due to high temperature and is one of the important causes of air pollution.
The national soil with about 3/4 in China belongs to the snow accumulation area in winter, and the icing of the road surface becomes the primary factor of frequent traffic accidents, harms the traffic safety of the road and causes great hidden dangers to the property and life safety of people. When rainfall or air is humid in winter, the moisture can be quickly frozen in a road surface and a certain structural depth at a lower temperature, and the ice layer with high strength is formed by gradually compacting the ice layer through rolling by a vehicle. Because the pavement has a certain structural depth and higher surface energy, the ice layer is tightly adhered to the pavement surface and is difficult to remove mechanically or manually.
As a chemical freezing inhibition paving technology, a typical product is Mafilon, salt is mainly wrapped by igneous rocks with porous structures, and the igneous rocks are ground into powdery particles to replace mineral powder in a mixture, so that the salt is fully dispersed in the mixture. Salt in the Mafilon material is gradually separated out from a narrow space with higher concentration in the asphalt mixture to a road surface with lower salt concentration through osmotic pressure, capillary phenomenon and the friction effect of running vehicles, and is rapidly dissolved in water, so that the liquid-phase vapor pressure of the water is reduced, but the solid-state vapor pressure of the ice is unchanged. In order to achieve the balance of solid-liquid steam pressure of the ice-water mixture, ice and snow begin to melt, so that the freezing of the pavement in winter is prevented and delayed, the snow-melting and ice-thawing effects are exerted, meanwhile, the volume of the porous material is kept unchanged after salt is separated out, and the damage of cavities caused by the separation of effective components of the mixture is avoided.
The Mafilon disadvantages include the following:
1. the main components of the composite material are chloride salt and carbonate, wherein the chloride salt is the main component, and the carbonate is a structural carrier. It is known that the drawbacks of the chlorine salt ice and snow remover are as listed above: 1) the concrete is corroded and cracked, and the service life of the road is shortened; 2) the salinization of soil affects the growth of vegetation and crops; 3) the long-term use increases the road maintenance cost; 4) corrode metals such as road steel bars, causing structural damage.
2. The main components can be continuously lost due to the fact that the chlorine salt can be quickly dissolved in water, and particularly in areas with much rainwater in spring and summer, the loss speed is higher, so that the effective service life of the material is only 2-3 years, and when the main components are completely lost, the function of removing ice and snow is completely lost.
3. As an additive of the asphalt pavement, the addition proportion is more than 1 percent, and the construction cost is higher. Taking this province as an example, the cost (including material cost and construction cost) of pavement of each cubic asphalt mixture is about 1300 yuan, and the cost of pavement per square is about 52 yuan. If mafilon is used, the construction investment needs to be increased by about 60-70 yuan per square, and the cost is increased by 134.6%.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a winter energy-releasing summer energy-storing composite phase-change material, a production method and application thereof, wherein the energy-releasing (heat-releasing) within a certain range of the freezing point temperature and below can be realized by utilizing the heating and heat-absorbing performance of a special solid-liquid phase-change material with higher latent heat at a specific temperature, and the energy-storing (heat-absorbing) at the temperature of 40 ℃ to more than 60 ℃ can be realized to realize the ice and snow removal of a road surface in winter and the temperature reduction of the road surface in summer.
In order to solve the technical problems, the invention adopts the technical scheme that: a winter energy-releasing summer energy-storing composite phase-change material comprises, by mass, 40-60 parts of modified composite phase-change paraffin, 10-15 parts of nano-silica, 5-10 parts of activated carbon, 2-5 parts of polypropylene glycol methyl ether acetate and 5-10 parts of light calcium carbonate;
the modified composite phase-change paraffin is obtained by sequentially carrying out oxidation reaction and esterification reaction on a mixture of high-melting-point phase-change paraffin and low-melting-point phase-change paraffin.
Further, the preparation method of the modified composite phase-change paraffin specifically comprises the following steps:
melting the high-melting-point phase-change paraffin and the low-melting-point phase-change paraffin in a reaction kettle at the temperature of 90 ℃, uniformly stirring, sequentially adding myristic acid and higher alcohol to respectively complete oxidation reaction and esterification reaction, and cooling the product to room temperature to obtain the modified composite phase-change paraffin.
Further, the modified composite phase-change paraffin comprises, by mass, 20-40 parts of high-melting-point phase-change paraffin, 40-60 parts of low-melting-point phase-change paraffin, 5-8 parts of myristic acid and 10-15 parts of higher alcohol.
Further, the preparation method of the energy-releasing summer energy-storing composite phase-change material in winter comprises the following steps:
s1, placing the modified composite phase-change paraffin in a reaction kettle according to the mass parts, heating to 90 ℃, sequentially adding the nano silicon dioxide, the activated carbon and the light calcium carbonate according to the mass parts, fully stirring for 30-40min, and cooling to room temperature to obtain a base material;
s2, finishing the granulation process by using the base material obtained in the S1 through a fluidization method, wherein the particle size is 1.5-2.0 mm;
s3, taking polypropylene glycol methyl ether acetate as a film forming material, and coating the base material particles with high molecular emulsion by adopting a boiling method process to obtain the energy-releasing and energy-storing composite phase change material in summer.
Further, the application of the energy-releasing summer energy-storing composite phase change material in winter is characterized in that the energy-releasing summer energy-storing composite phase change material in winter is mixed into an asphalt mixture according to a certain proportion and is added according to 5 per mill to 8 per mill of the mass of the asphalt mixture.
Compared with the prior art, the invention has the beneficial effects that: by utilizing the characteristics of releasing heat energy and absorbing heat energy of specific phase change substances in different temperature ranges and through certain physical and chemical processes, the composite phase change material which is stable in chemical property, insoluble in water, resistant to high temperature, ultraviolet, oxidation and ageing is formed, and the composite phase change material is doped into a pavement asphalt mixture according to a certain proportion, so that the effects of releasing energy below the freezing point in winter and storing energy above 40 ℃ in summer are realized on the premise of not influencing various pavement performances of the asphalt pavement.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:
FIG. 1 is a DSC curve of sample 1A;
FIG. 2 is a DSC curve of sample 2A;
FIG. 3 is a TG detection curve of sample 1B;
fig. 4 is a TG detection curve of sample 2B;
FIG. 5 is a DSC curve of sample 3.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
A Phase Change Material (PCM-Phase Change Material) refers to a substance that changes the state of a substance at a constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, and in this case, the phase change material absorbs or releases a large amount of latent heat. Once the material is widely applied to human life, the material becomes an optimal green environment-friendly carrier for energy conservation and environmental protection, and is listed as a national research and development utilization sequence in China. At present, phase change materials are widely applied to the industries or fields of aerospace, buildings, clothes, refrigeration equipment, military, communication, electric power and the like.
Phase change materials can be divided into Organic (Organic) and Inorganic (Inorganic) phase change materials. They can also be divided into Hydrated Salts (Hydrated Salts) phase change materials and waxy (Paraffin Wax) phase change materials.
Phase change materials have the ability to change their physical state over a range of temperatures. Taking waxy phase-change materials (solid-liquid phase change) as an example, when the materials are heated to a melting temperature, the materials generate phase change from a solid state to a liquid state, and the phase-change materials absorb and store a large amount of latent heat in the melting process; when the phase change material is cooled, the stored heat is dissipated to the environment within a certain temperature range, and reverse phase change from liquid to solid is carried out. In both phase change processes, the stored or released energy is called latent heat of phase change. When the physical state changes, the temperature of the material is almost kept unchanged before the phase change is completed, a wide temperature platform is formed, and although the temperature is unchanged, the latent heat absorbed or released is quite large.
Saturated hydrocarbons (paraffins), certain crystalline polymers (plastics) and certain naturally occurring organic acids are more practical organic phase change materials in terms of melting point, heat of fusion, performance stability, price. The commonly used organic phase change materials mainly comprise paraffin, fatty acid, polyhydric alcohol and the like.
The invention adopts a solid-liquid phase change energy storage mechanism, utilizes paraffin and unsaturated fatty acid organic phase change substances, and is based on the following characteristics: (1) the latent heat of fusion is high, so that the material can store or emit more heat in phase change; (2) the phase change process has good reversibility, small expansion and contraction, and less supercooling or overheating phenomena; (3) the phase transition temperature is proper, and the specific temperature required to be controlled can be met; (4) the heat conductivity coefficient is large, the density is large, and the specific heat capacity is large; (5) the phase-change material is non-toxic, non-corrosive, low in cost and convenient to manufacture.
A winter energy-releasing summer energy-storing composite phase-change material comprises, by mass, 40-60 parts of modified composite phase-change paraffin, 10-15 parts of nano-silica, 5-10 parts of activated carbon, 2-5 parts of polypropylene glycol methyl ether acetate and 5-10 parts of light calcium carbonate; the modified composite phase-change paraffin is obtained by performing oxidation reaction and esterification reaction on a mixture of high-melting-point phase-change paraffin and low-melting-point phase-change paraffin.
The preparation method of the modified composite phase-change paraffin comprises the following steps:
melting high-melting-point phase-change paraffin and low-melting-point phase-change paraffin in a reaction kettle at 90 ℃ under normal pressure, uniformly stirring, sequentially adding myristic acid and higher alcohol to respectively complete oxidation reaction and esterification reaction, and cooling the product to room temperature to obtain the modified composite phase-change paraffin.
Because the paraffin is mainly a mixture of straight-chain paraffin and hydrocarbon compounds, the general formula of the paraffin is C n H 2n+2 In order to increase the boiling point, the invention adopts a two-step method of firstly oxidizing and then esterifying to modify the paraffin. Myristic acid (organic carboxylic acid with 14 carbon atoms) is selected and is firstly introduced into a-COOH group through oxidation modification, the boiling point of the modified paraffin is obviously improved, but the weak acidity and the hydrophilicity are not beneficial to the application of the product. And then, high-carbon alcohol (saturated monohydric alcohol with more than twelve carbon atoms) and the paraffin wax which is oxidized and then grafted with carboxyl are selected to carry out esterification reaction, so as to obtain the esterified paraffin wax. The esterified paraffin is further improved in boiling point due to the elimination of acidity, is insoluble in water and can meet the use conditions.
In the preparation process of the modified composite phase-change paraffin, the modified composite phase-change paraffin comprises, by mass, 20-40 parts of high-melting-point phase-change paraffin, 40-60 parts of low-melting-point phase-change paraffin, 5-8 parts of myristic acid and 10-15 parts of higher alcohol.
The technical effect of the energy-releasing summer energy-storing composite phase-change material obtained in the invention in winter is explained in the following by combining with the embodiment.
And (3) taking 30 g of low-melting-point phase-change paraffin and 10 g of high-melting-point phase-change paraffin, putting the low-melting-point phase-change paraffin and the high-melting-point phase-change paraffin into a round-bottom flask, heating to 90 ℃, stirring for 10-15 minutes to be uniform after all the high-melting-point phase-change paraffin is melted, cooling to room temperature to obtain mixed phase-change paraffin, and taking a plurality of mixed phase-change paraffin as samples 1.
And adding 30 g of low-melting-point phase-change paraffin and 10 g of high-melting-point phase-change paraffin into a round-bottom flask, heating to 90 ℃, stirring for 10-15 minutes after all the low-melting-point phase-change paraffin and the high-melting-point phase-change paraffin are melted to be uniform, adding a certain amount of myristic acid, and continuing stirring for 20-30 minutes. And heating to 120 ℃, adding a certain amount of higher alcohol, stirring for 20-30 minutes, cooling to room temperature to obtain the modified composite phase-change paraffin, and taking a small amount of the modified composite phase-change paraffin as a sample 2.
Example 1
Weighing 10.5mg of sample 1 as sample 1A and 9.3mg of sample 2 as sample 2A, and performing Differential Scanning Calorimetry (DSC) thermal analysis on sample 1A and sample 2A, wherein the detection conditions are as follows:
temperature range: -20 ℃ to 90 ℃;
the heating rate is as follows: 4 ℃/minute;
cooling rate: 4 ℃/minute;
starting from minus 20 ℃ and increasing the temperature to 90 ℃ according to the set temperature rising rate, and then reducing the temperature from 90 ℃ to minus 20 ℃ according to the set temperature reducing rate, thereby forming a complete temperature rising and reducing detection cycle. The DSC curve obtained by detecting the sample 1A is shown in figure 1, and the DSC curve obtained by detecting the sample 2A is shown in figure 2.
In FIG. 1 and FIG. 2, A, B, C, D includes four peaks, wherein the A, C peak is an energy release (exothermic) peak, the B, D peak is an energy storage (endothermic) peak, and the DSC curve of sample 2A shows the peak shape as A 1 ，B 1 ，C 1 And D 1 For differentiation, the data for each peak shape are shown in the following table:
the DSC detection data of A1 and A2 show that: the phase-change latent heat value of the phase-change paraffin modified by oxidation and esterification is changed little, and the effective temperature interval of energy release and energy storage is not changed obviously.
Example 2
Weighing a little from the sample 1 as a sample 1B, weighing a plurality of samples from the sample 2 as a sample 2B, and performing thermogravimetric analysis (TG) on the sample 1B and the sample 2B respectively, wherein the set detection conditions are as follows:
temperature rise temperature range: 30-240 deg.C
The TG curve obtained by thermogravimetry of sample 1B is shown in fig. 3, and the TG curve obtained by thermogravimetry of sample 2B is shown in fig. 4.
As can be seen from fig. 3, sample 1B had a mass decrease at a temperature of 115 ℃ and had a mass of only 53% of the initial mass at a temperature of 180 ℃. As can be seen from fig. 4, the sample 2B has a mass decrease when the temperature is raised to 135 ℃, and when the temperature is raised to 180 ℃, the mass still maintains 97% of the initial mass, only 3% is lost, and comparing the sample 1 and the sample 2, the modified composite phase-change paraffin can withstand the high temperature of 180 ℃ during road asphalt mixture processing while basically maintaining the latent heat of phase change.
Example 3
20 g of the finished product of the invention is added into 20 g of modified asphalt SBS which is heated to 180 ℃, and after being stirred evenly, the product is preserved for 20 minutes at the constant temperature of 180 ℃, and then is naturally cooled to the room temperature. Weighing 5.7mg of the cooled mixture as a sample 3, and carrying out differential scanning calorimetry analysis on the sample 3, wherein the set detection conditions are as follows:
temperature range: -20 ℃ to 90 ℃;
the heating rate is as follows: 4 ℃/minute;
cooling rate: 4 ℃/minute;
starting from minus 20 ℃ and increasing the temperature to 90 ℃ according to the set temperature rising rate, and then reducing the temperature from 90 ℃ to minus 20 ℃ according to the set temperature reducing rate, thereby forming a complete temperature rising and reducing detection cycle.
The DSC curve obtained by testing sample 3 is shown in fig. 5, and fig. 5 includes four peaks a2, B2, C2, and D2, where the peaks a2 and C2 are energy release (heat release) peaks, and the peaks B2 and D2 are energy storage (heat absorption) peaks, and the data of each peak is shown in the following table:
because the main component of the asphalt is a complex organic mixture consisting of hydrocarbons with different molecular weights and non-metallic derivatives thereof, the mass ratio of the complex organic mixture to the modified asphalt SBS at the temperature of 180 ℃ is 1: in the mixing experiment of 1, because the product accounts for 50% of the mixture by mass, the latent heat of phase change of the product is reduced to 50% of the original latent heat of the product, and the temperature intervals of phase change energy storage and energy release are not obviously changed, so that the product is verified to have no obvious mass loss in the high-temperature asphalt mixing process and have no chemical reaction with asphalt which influences the latent heat of phase change and the temperature intervals of energy storage and energy release.
Example 4:
preparing an SMA-13 asphalt mixture test piece, wherein the mass ratio of the product to the asphalt mixture is 1: the proportion of 200 is added, the size of a test piece is 300mm 80mm, the mass of the asphalt mixture is 17940 g, the mass of the product is 90 g, and an asphalt mixture rutting test is carried out on the test piece (road engineering asphalt and asphalt mixture test regulation (JTG E20-2011)), so that the asphalt mixture (test piece number 1) added with the product and the asphalt mixture (test piece number 2) not added with the product are detected and compared as shown in the following table:
from the above table, the dynamic stability value of the SMA13 type asphalt mixture added with the product of the invention is only reduced by 1.9%, and the test value is still far higher than the highest requirement of China on road asphalt mixture in traffic and transportation industry specifications, and the product has the application condition in various roads.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (5)
1. The energy-releasing summer energy-storing composite phase-change material in winter is characterized by comprising, by mass, 40-60 parts of modified composite phase-change paraffin, 10-15 parts of nano silicon dioxide, 5-10 parts of activated carbon, 2-5 parts of polypropylene glycol methyl ether acetate and 5-10 parts of light calcium carbonate;
the modified composite phase-change paraffin is obtained by sequentially carrying out oxidation reaction and esterification reaction on a mixture of high-melting-point phase-change paraffin and low-melting-point phase-change paraffin.
2. The winter energy-releasing summer energy-storing composite phase-change material as claimed in claim 1, wherein the preparation method of the modified composite phase-change paraffin is as follows:
melting the high-melting-point phase-change paraffin and the low-melting-point phase-change paraffin in a reaction kettle at the temperature of 90 ℃, uniformly stirring, sequentially adding myristic acid and higher alcohol to respectively complete oxidation reaction and esterification reaction, and cooling the product to room temperature to obtain the modified composite phase-change paraffin.
3. The energy-releasing summer energy-storing composite phase-change material in winter as claimed in claim 2, wherein the modified composite phase-change paraffin comprises, by mass, 20-40 parts of high-melting-point phase-change paraffin, 40-60 parts of low-melting-point phase-change paraffin, 5-8 parts of myristic acid and 10-15 parts of higher alcohol.
4. A method for preparing the energy-releasing summer energy-storing composite phase-change material in winter as claimed in any one of claims 1 to 3, which comprises the following steps:
s1, placing the modified composite phase-change paraffin in a reaction kettle according to the mass parts, heating to 90 ℃, sequentially adding the nano silicon dioxide, the activated carbon and the light calcium carbonate according to the mass parts, fully stirring for 30-40min, and cooling to room temperature to obtain a base material;
s2, finishing the granulation process by using the base material obtained in the S1 through a fluidization method, wherein the particle size is 1.5-2.0 mm;
s3, taking polypropylene glycol methyl ether acetate as a film forming material, and coating the base material particles with high molecular emulsion by adopting a boiling method process to obtain the energy-releasing and energy-storing composite phase change material in summer.
5. Use of the energy-releasing summer energy-storing composite phase-change material according to any one of claims 1 to 5, wherein the energy-releasing summer energy-storing composite phase-change material is mixed into the asphalt mixture according to a certain proportion, and is added according to 5 per mill to 8 per mill of the quality of the asphalt mixture.
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| CN114524635A (en) * | 2022-02-22 | 2022-05-24 | 河北交投路桥建设开发有限公司 | Road composite phase change material for asphalt pavement and preparation method thereof |
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| CN101029216A (en) * | 2007-04-16 | 2007-09-05 | 徐虎林 | Self-temperature-adjusting phase-variable material for highway and its production |
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