Composite phase change material capable of releasing energy in winter and storing energy in summer as well as production method and application of composite phase change material

A composite phase change material and composite phase change technology, applied in the field of composite phase change materials for energy release in winter and energy storage in summer, can solve problems such as reducing road service life, affecting vegetation, crop growth, and increasing road maintenance costs

Pending Publication Date: 2022-08-05
安徽禾基科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that the defects of chlorine salt deicing agents are as listed above: 1) cause concrete erosion and cracking, and reduce the service life of the road; 2) soil salinization affects the growth of vegetation and crops; 3) long-term use increases the cost of road maintenance; 4) Corrosion of road steel bars and other metals, causing structural damage
[0007] 2. Since chlorine salt can be quickly dissolved in water, the main components will be continuously lost, especially in areas with more rain in spring and summer, and the loss rate will be faster. Therefore, the effective service life of this type of material is only 2-3 years. When the main components are lost After it is exhausted, its function of removing ice and snow is also lost.
[0008] 3. As an additive for asphalt pavement, its addition ratio is greater than 1%, and the construction cost is relatively high
If mafilon is used, the construction investment needs to be increased by about 60-70 yuan per square meter, and the cost will increase by 134.6%.

Method used

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  • Composite phase change material capable of releasing energy in winter and storing energy in summer as well as production method and application of composite phase change material
  • Composite phase change material capable of releasing energy in winter and storing energy in summer as well as production method and application of composite phase change material
  • Composite phase change material capable of releasing energy in winter and storing energy in summer as well as production method and application of composite phase change material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of above-mentioned modified composite phase change paraffin is as follows:

[0035] Under normal pressure, melt high melting point phase change paraffin wax and low melting point phase change paraffin wax in a reaction kettle at 90 °C and stir evenly, then add myristic acid and higher alcohol in turn to complete the oxidation reaction and esterification reaction, respectively, and the product is cooled to room temperature. That is, the modified composite phase change paraffin.

[0036] Because paraffin is mainly a mixture of straight chain alkanes and hydrocarbons, its general formula is Cn H 2n+2 , in order to improve its boiling point, the present invention adopts the two-step method of first oxidation and then esterification to modify the paraffin. Select myristic acid (organic carboxylic acid with 14 carbon atoms), firstly introduce -COOH group through oxidative modification, the boiling point of the modified paraffin has been significantly i...

Embodiment 1

[0042] Weigh 10.5 mg from sample 1 as sample 1A, and weigh 9.3 mg from sample 2 as sample 2A, and perform differential scanning calorimetry (DSC) thermal analysis on sample 1A and sample 2A, where the set detection conditions are :

[0043] Temperature range: -20℃—90℃;

[0044] Heating rate: 4°C / min;

[0045] Cooling rate: 4℃ / min;

[0046] Start from -20°C to 90°C at the set heating rate, and then drop from 90°C to -20°C at the set cooling rate, which is a complete temperature rise and fall detection cycle. After the sample 1A was detected, the DSC curve was obtained as follows: figure 1 As shown, the DSC curve obtained after the detection of sample 2A is as follows: figure 2 shown.

[0047] At figure 1 as well as figure 2 It contains four peak shapes of A, B, C and D, among which A and C peaks are energy release (exothermic) peak shapes, B and D peaks are energy storage (endothermic) peak shapes, and the DSC detection curve of sample 2A shows The peak shape starts w...

Embodiment 2

[0051] Weigh a small amount from sample 1 as sample 1B, and weigh a few from sample 2 as sample 2B, and perform thermogravimetric analysis (TG) on sample 1B and sample 2B respectively. The set detection conditions are:

[0052] Heating temperature range: 30℃-240℃

[0053] After thermogravimetric detection of sample 1B, the TG curve is obtained as follows: image 3 As shown, after the thermogravimetric detection of sample 2B, the TG curve is obtained as follows Figure 4 shown.

[0054] from image 3 It can be seen that the mass of sample 1B decreases when the temperature is raised to 115°C, and when the temperature is raised to 180°C, the mass is only 53% of the initial mass, and the mass loss is very large. from Figure 4 It can be seen that the mass of sample 2B decreases when the temperature is raised to 135 °C. When the temperature is raised to 180 °C, the mass still maintains 97% of the initial mass and only loses 3%. Comparing sample 1 and sample 2, the modified comp...

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Abstract

The invention provides a composite phase change material capable of releasing energy in winter and storing energy in summer, which is prepared from the following components in parts by mass: 40 to 60 parts of modified composite phase change paraffin, 10 to 15 parts of nano silicon dioxide, 5 to 10 parts of activated carbon, 2 to 5 parts of polypropylene glycol methyl ether acetate and 5 to 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 composite phase-change material which is stable in chemical property, insoluble in water, resistant to high temperature, resistant to ultraviolet rays, resistant to oxidation and resistant to aging is formed after certain physical and chemical process treatment by utilizing the characteristic that a specific phase-change substance releases heat energy and absorbs heat energy in different temperature intervals, and the material is doped into a pavement asphalt mixture according to a certain proportion. The effects of releasing energy below the freezing point in winter and storing energy above 40 DEG C in summer are realized on the premise of not influencing various pavement performances of the asphalt pavement.

Description

technical field [0001] The invention relates to a composite phase change material for releasing energy in winter and storing energy in summer, a production method and application thereof. Background technique [0002] Asphalt pavement is widely used in urban roads and highway trunk lines, and it is a high-grade pavement with the largest paved area in China. In summer, the intensity of solar heat radiation is high and the sunshine time is long, which can easily lead to the increase of the temperature of the asphalt pavement. Because the asphalt pavement is black, the absorption rate of solar thermal radiation reaches 0.85 to 0.95. Under the condition of high temperature, the anti-deformation ability of asphalt pavement will be reduced, and diseases such as rutting, jamming and even shifting are prone to occur under the load of vehicles. When the temperature is lower than 30°C, there will be no large ruts; if the temperature exceeds 38°C, there will be a large rut depth; if ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08L95/00C08L91/06C08L71/02C08K7/26C08K7/24C08K3/26
CPCC09K5/063C08L95/00C08K2003/265C08K2201/011C08L91/06C08L71/02C08K7/26C08K7/24C08K3/26Y02E70/30
Inventor 陈志宇吴晓静霍争春
Owner 安徽禾基科技有限公司
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