Copper nanofluid solar cooling liquid and preparation method thereof

A copper nano, solar energy technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of reducing the thermal conductivity of copper nano fluid cooling liquid, unstable dispersion of copper nano powder, easy to agglomerate, etc., to avoid oxidation problems. , the adsorption effect is stable, the effect of reducing the relative density

Inactive Publication Date: 2013-04-17
济南道生一新能源科技有限公司
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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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  • Copper nanofluid solar cooling liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of copper nanofluid solar cooling liquid, it is made up of following components by weight: 55 parts of deionized water, 15 parts of ethylene glycol, 24 parts of propylene glycol, and average particle diameter is 3.5 parts of nano copper powder of 50nm, ethylene 0.6 parts of pyridine, 0.006 parts of azobisisobutyronitrile, 0.35 parts of polyvinylpyrrolidone, 0.2 parts of 1,3-dimethyl-2-imidazolinone, 0.34 parts of sodium tripolyphosphate, 0.36 parts of potassium dihydrogen phosphate, 0.24 parts of sodium phosphite, 0.31 parts of sodium hypophosphite, and 0.1 part of benzotriazole.

[0026] Its preparation method is: sodium tripolyphosphate, potassium dihydrogen phosphate, sodium phosphite and sodium hypophosphite are stirred and dissolved in deionized water with a tetrafluoroelectric electric stirrer to obtain a phosphate aqueous solution. The pH value of the final nanofluid is stabilized at about 10.2, which is the optimal pH region where the nanofluid can exist ...

Embodiment 2

[0032] A kind of copper nanofluid solar cooling liquid, it is made up of following components by weight: 55 parts of deionized water, 15 parts of ethylene glycol, 24 parts of propylene glycol, and average particle diameter is 3.5 parts of nano copper powder of 50nm, ethylene 0.6 parts of pyridine, 0.006 parts of azobisisobutyronitrile, 0.35 parts of polyvinylpyrrolidone, 0.2 parts of 1,3-dimethyl-2-imidazolinone, 0.34 parts of sodium tripolyphosphate, 0.36 parts of potassium dihydrogen phosphate, 0.24 parts of sodium phosphite, 0.31 parts of sodium hypophosphite, and 0.1 part of benzotriazole.

[0033] The steps of the preparation method in this example are the same as those in Example 1. The difference is that the copper nano-copper powder is added to the alcohol solution, and the rotation speed is 20 kr / min to disperse for 4 minutes, and then vinylpyridine and azobisisobutyronitrile are added. Continue to disperse at a rotational speed of 20kr / min for 4min. In the stage of v...

Embodiment 3

[0038] A kind of copper nanofluid solar cooling liquid, it is made up of following components by weight: 50 parts of deionized water, 22 parts of ethylene glycol, 22 parts of propylene glycol, and average particle diameter is 3.5 parts of nano copper powder of 20nm, ethylene 0.8 parts of pyridine, 0.007 parts of azobisisobutyronitrile, 0.25 parts of polyvinylpyrrolidone, 0.25 parts of 1,3-dimethyl-2-imidazolinone, 0.2 parts of sodium tripolyphosphate, 0.34 parts of potassium dihydrogen phosphate, 0.254 parts of sodium phosphite, 0.25 parts of sodium hypophosphite, 0.2 parts of benzotriazole.

[0039] The steps of the preparation method in this embodiment are the same as those in Embodiment 2 and will not be repeated. The test results show that,

[0040] (1) In this case, the polyvinylpyridine-coated copper nanofluid had only insignificant turbidity after standing for 1500 hours without the treatment of the folded and reduced-diameter tube flowing through it;

[0041] (2) The...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/20
Inventor 王博
Owner 济南道生一新能源科技有限公司
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