Copper nanofluid solar cooling liquid and preparation method thereof

Abstract

The invention provides a copper nanofluid solar cooling liquid and a preparation method thereof, and belongs to the field of synthesis technologies of inorganic materials. The copper nanofluid solar cooling liquid comprises deionized water, glycol and propylene glycol, nano-copper powder, vinylpyridine, azodiisobutyronitrile, acylamino compound, phosphates and benzotriazole. The preparation method comprises the following steps of: uniformly dispersing the nano-copper powder into alcoholic solution by rapid dispersing; polymerizing on the nanometer copper surface to obtain a monomolecular film; adding a dispersing agent; mixing the obtained alcoholic solution with phosphate aqueous solution; dispersing and mixing at a medium speed again; dispersing by an ultrasonic oscillating instrument; and then homogenizing through a fold-type reducer pipe, so as to obtain the copper nanofluid solar cooling liquid. The prepared copper nanofluid has the characteristics that the thermal conductivity is four times higher than that of the deionized water, the uniformity in dispersing is realized, the stability is excellent, the stability is remained after placing for 2400 hours at the normal state, the freezing point is low, no icing occurs at the temperature of -40 DEG C, the corrosion resistance is excellent, and the copper nanofluid is suitable for an anti-freezing liquid, and the material source is rich; the raw materials are directly sourced, low in price and easy to obtain; low requirement is brought to the running of the equipment; and the massive industrial production can be easily realized.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a copper nanofluid solar cooling liquid. Background technique [0002] At present, most of the solar cooling liquids on the market are made of a mixture of pure water and ethylene glycol with a low freezing point, a high boiling point, and non-volatile as the base liquid. As we all know, water is the liquid with the best thermal conductivity and the largest specific heat capacity. After adding ethylene glycol, the thermal conductivity and specific heat capacity of the mixed liquid will decrease. And if the optimum freezing point value is obtained, the mass fraction of the amount of ethylene glycol added in the mixed solution must reach 70%, and as the amount of ethylene glycol added increases, the thermal conductivity of the mixed solution will inevitably decrease. Solar energy is a low-grade energy source. In the process of its collection and utilization, the thermal conduct...

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Problems solved by technology

However, the copper nanofluid produced by such methods generally has the phenomenon of unstable copper nano powder dispersion, easy agglomeration and precipitation; and the nano copper powder coated with carbon will form a macroscopic carbon layer on the surface of the copper powder. The carbon layer is a poor conductor of heat and the coating needs a certain thickness. The carbon layer will greatly reduce the heat conduction effect of the copper nanofluid coolant

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