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

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 ...

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%.

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