Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof

A large-volume concrete and heat-conducting fluid technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of insufficient stability of microcapsule suspensions and achieve high suspension stability

Active Publication Date: 2010-05-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the disadvantage that the stability of the current phase change material microcapsule suspension is not good enough, the present invention provides a hea...

Method used

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  • Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof
  • Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof
  • Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof

Examples

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Embodiment 1

[0029] A heat-conducting fluid used to reduce the internal temperature rise of mass concrete is a microcapsule suspension, with hexadecane microcapsules as the dispersant, water as the liquid carrier, and 0.25% wt of hydroxymethyl cellulose as the Dispersant, the pH of the liquid system is pH=8, the concentration of the phase change material hexadecane microcapsules is 20%wt, the wall material of the hexadecane microcapsules is polyurea-melamine resin, and the phase transition temperature is 17.42°C, the phase transition enthalpy is 147.93J / g, and the particle size range is 1.51-10.48um.

[0030] The specific preparation process of the heat transfer fluid used to reduce the internal temperature rise of mass concrete is as follows:

[0031] Dissolve hydroxymethyl cellulose in water at 70°C so that its molecules can fully stretch in water, prepare a 5%wt solution and cool to room temperature for use;

[0032] Add 1 mass part of hexadecane microcapsules to 4 mass parts of water,...

Embodiment 2

[0035] A heat-conducting fluid used to reduce the internal temperature rise of mass concrete is a microcapsule suspension, with hexadecane microcapsules as the dispersant, water as the liquid carrier, and 0.2% wt of hydroxymethyl cellulose as the Dispersant, the pH of the liquid system is pH=7, the concentration of the phase change material hexadecane microcapsules is 10%wt, the wall material of the hexadecane microcapsules is polyurea-melamine resin, and the phase transition temperature is 17.42°C, the phase transition enthalpy is 147.93J / g, and the particle size range is 1.51-10.48um.

[0036] The specific preparation process of the heat transfer fluid used to reduce the internal temperature rise of mass concrete is as follows:

[0037] Dissolve hydroxymethyl cellulose in water at 60°C so that its molecules can fully stretch in water, prepare a 5%wt solution and cool to room temperature for use;

[0038] Add 1 mass part of hexadecane microcapsules to 9 mass parts of water, ...

Embodiment 3

[0041] A heat-conducting fluid used to reduce the internal temperature rise of mass concrete is a microcapsule suspension, with hexadecane microcapsules as the dispersant, water as the liquid carrier, and 0.3% wt of hydroxymethyl cellulose as the Dispersant, the pH of the liquid system is pH=9, the concentration of the phase change material hexadecane microcapsules is 25%wt, the wall material of the hexadecane microcapsules is polyurea-melamine resin, and the phase transition temperature is 17.42°C, the phase transition enthalpy is 147.93J / g, and the particle size range is 1.51-10.48um.

[0042] The specific preparation process of the heat transfer fluid used to reduce the internal temperature rise of mass concrete is as follows:

[0043] Dissolve hydroxymethyl cellulose in water at 50°C so that its molecules can fully stretch in water, prepare a 5%wt solution and cool to room temperature for use;

[0044] Add 1 mass part of hexadecane microcapsules to 3 mass parts of water, ...

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Abstract

The invention discloses a heat-conducting fluid for reducing internal temperature rise of mass concrete and a preparation method thereof. The method comprises the following steps: step 1, adding 1 part of cetane microcapsules by mass to 3-10 parts of water by mass, and under the condition of stirring, adding 0.04-0.06 part of 5wt% hydroxymethyl cellulose water solution by mass at room temperature to prepare phase-change material microcapsule suspending liquid, wherein the wall material of the cetane microcapsules is polyurea-melamine resin, the phase change temperature is 17.42 DEG C, the enthalpy of phase change is 147.93J/g, and the range of the particle size is from 1.51 to 10.48mu m; and step 2, adjusting the pH of the phase-change material microcapsule suspending liquid obtained in the step 1 to be equal to 8+/-1, and then, stirring continuously to obtain the phase-change material microcapsule suspending liquid with stable suspension property, namely the heat-conducting fluid for reducing the internal temperature rise of the mass concrete. The heat-conducting fluid has high suspension stability, higher apparent specific heat and good flowability.

Description

technical field [0001] The invention belongs to the field of using phase change materials to reduce the heat of hydration inside concrete, and relates to a heat-conducting functional fluid that uses water as a liquid carrier and cetane microcapsule particles as a functional component to reduce the internal temperature rise of large-volume concrete. Preparation. Background technique [0002] After the mass concrete is poured, the heat of hydration released by the cement hydration reaction will cause the internal temperature of the structure to rise sharply, thereby generating large temperature stress, resulting in temperature cracks, which seriously affect the durability of the structure. At present, the commonly used method to reduce the internal temperature rise of mass concrete is to pass water through the embedded pipes for cooling, but this method has low thermal conductivity, high distribution density of cooling pipes, and local temperature gradient between the pipe wal...

Claims

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Application Information

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IPC IPC(8): C09K5/06C04B40/00
Inventor 钱春香高桂波李志刚
Owner SOUTHEAST UNIV
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