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A kind of preparation method of lipophilic hyperbranched molecular modification nanofluid

A nanofluid and lipophilic technology, applied in the field of heat transfer, can solve the problems of difficult to guarantee the stability of nanofluid and the influence of nanofluid heat transfer ability, etc., and achieve the effect of easy popularization and application, prolonging life, and simple steps

Active Publication Date: 2021-04-02
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional nanofluids need to add dispersants or surfactants to improve their stability during the preparation process, but adding dispersants or surfactants will affect the heat transfer capability of nanofluids, and once dispersants or surfactants occur Aging and deterioration, the stability of nanofluids is difficult to be guaranteed

Method used

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  • A kind of preparation method of lipophilic hyperbranched molecular modification nanofluid
  • A kind of preparation method of lipophilic hyperbranched molecular modification nanofluid
  • A kind of preparation method of lipophilic hyperbranched molecular modification nanofluid

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Effect test

Embodiment 1

[0034] The preparation method of the lipophilic hyperbranched molecular modified nanofluid of the present embodiment is as follows:

[0035] (1) Add 10 g of hexadecyl chloride to 40 mL of chloroform, under nitrogen protection, dissolve 2 g of PEI (number average molecular weight distribution 1000-36000) in chloroform and add to the above solution, then add 5 g of triethyl amine, the mixture was vigorously stirred at 0°C for 3 h, then the mixture was reacted at 25°C for 24 h, and finally reacted at 70°C for 2 h to obtain a crude product; then, the crude product was cooled to room temperature, and the waste residue was removed by suction filtration. Stir for 1 h, discard the upper layer of acetone, repeat the washing twice, 35 ° C rotary evaporation and vacuum drying to obtain HPEI-C16;

[0036] (2) Add 0.4 g tetra-n-octylammonium bromide and 0.2 g potassium chloropalladate to 120 mL toluene, and react for 1 h. Take the organic phase, add 0.2 g HPEI-C16, add 20 mL NaBH dropwise...

Embodiment 2

[0040] The preparation method of the lipophilic hyperbranched molecular modified nanofluid of the present embodiment is as follows:

[0041] (1) Add 0.3 g tetra-n-octylammonium bromide and 0.1 g potassium chloropalladate to 120 mL toluene, and react for 1 h. Take the organic phase, add 0.2 g of HPEI-C16 obtained in Example 1, add 20 mL of NaBH dropwise 4 Aqueous solution (0.1 g / 10 mL water), stirring vigorously for 12 h, standing still to take the organic layer; rotary evaporation at 45 ℃ to get the crude product, washing with absolute ethanol 3 times, drying in vacuum overnight at 25 ℃ to obtain lipophilic hyperbranched molecular modification nanoparticles;

[0042] (2) The nanoparticles obtained in step (1) were weighed, added to decahydronaphthalene for ultrasonic dispersion for 1 h, and a lipophilic hyperbranched molecule-modified nanofluid with a nanoparticle content of 0.01% to 0.5% was obtained.

[0043] The palladium nanofluid can exist stably for more than one month...

Embodiment 3

[0045] The preparation method of the lipophilic hyperbranched molecular modified nanofluid of the present embodiment is as follows:

[0046] (1) Add 0.3 g tetra-n-octylammonium bromide and 0.4 g potassium chloropalladate to 120 mL toluene, and react for 1 h. Take the organic phase, add 0.2 g of HPEI-C16 obtained in Example 1, add 20 mL of NaBH dropwise 4 Aqueous solution (0.1 g / 10mL water), stirring vigorously for 12 h, standing still to take the organic layer; 45 ℃ rotary evaporation to get the crude product, washing with absolute ethanol 3 times, vacuum drying at 25 ℃ overnight to obtain lipophilic hyperbranched molecular modified nano particles.

[0047] (2) The nanoparticles obtained in step (1) were weighed, added to decahydronaphthalene for ultrasonic dispersion for 1 h, and a lipophilic hyperbranched molecule-modified nanofluid with a nanoparticle content of 0.01% to 0.3% was obtained.

[0048] The palladium nanofluid can exist stably for more than 15 days, and the th...

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Abstract

The invention discloses a preparation method of lipophilic hyperbranched molecule modified nanofluid, wherein the nanofluid is composed of a liquid medium and nanoparticles dispersed in the liquid medium. The preparation method comprises the main steps of preparation and dispersion of the nanoparticles. The surface of the nano material is modified by lipophilic hyperbranched molecules. Compared with the prior art, the preparation method has the advantages that the nano particles are dispersed stably without agglomeration, the nano particles are loaded by utilizing the specific dendritic macromolecular structure of the hyperbranched polyethyleneimine grafted by long-chain alkyl acyl chloride, the number-average molecular weight of hyperbranched molecules is distributed between 1000 and 36000. The prepared nano particles are relatively small in particle size, not easy to agglomerate and good in stability. By the addition amount of 0.01%-5%, the nano fluid with good stability and excellent heat-conducting property can be obtained; and the preparation process is controllable, good in repeatability and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of heat transfer, and relates to a nanofluid heat transfer working fluid, in particular to a lipophilic hyperbranched molecular modified nanofluid and a preparation method thereof. Background technique [0002] With the continuous development of the economy and society and the increasingly prominent energy problems, the effective use and conservation of energy has become a problem that is highly valued in the economic development of various countries. Traditional heat transfer fluids have low thermal conductivity and poor heat transfer capacity, making it difficult to meet today's high-intensity and high-load heat transfer requirements. It is urgent to develop new and efficient heat transfer fluids with high thermal conductivity and good heat transfer performance to meet high Heat transfer requirements under load and special conditions. Nanofluid is a new type of heat exchange medium that is uniform, stable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/10C08G73/02C08G83/00
CPCC08G73/0206C08G83/006C09K5/10
Inventor 秦笑梅秦肖雲王兰陈亚培赵建波周娇吴倩
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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