CN101712862B - Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof - Google Patents
Heat-conducting fluid for reducing internal temperature rise of mass concrete and preparation method thereof Download PDFInfo
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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
The invention belongs to using phase-change material and reduce inside concrete hydration heat field, relate to a kind of be liquid carrier with water, be the preparation method of heat conduction functional fluid who is used to reduce internal temperature rise of mass concrete of functional component with the cetane microcapsule particle.
Background technology
After the casting of concrete in mass, the hydration heat that hydrated reaction of cement discharges can cause the temperature of inside configuration significantly to rise, and then produces bigger thermal stress, causes the appearance temperature crack, has a strong impact on structure durability.At present the method for reduction internal temperature rise of mass concrete commonly used is water flowing cooling in pre-buried pipeline, but problem such as this method exists that the capacity of heat transmission is lower, the cooling duct distribution density is higher, the localized temperature gradients of tube wall and concrete substrate is excessive in the process of cooling.The important channel that effectively overcomes the above problems is to adopt the stronger functional fluid of the capacity of heat transmission to replace water as heat-eliminating medium.
The heat conduction functional fluid is that phase change material and liquid carrier are combined the fluid liquid prepared with appropriate mode.Phase change material in the heat conduction functional fluid enough absorbs in the process that solid-liquid phase change takes place or emits a large amount of heats, makes fluid have higher apparent specific heat in phase transition temperature interval, thereby has the higher capacity of heat transmission.Adopt the heat conduction functional fluid to replace water as heat-eliminating medium; Not only can obtain better cooling-down effect; Also can effectively reduce distribution density that cooling tube leads and the energy consumption in the heat-eliminating medium working cycle; Effectively avoid the appearance of local microfracture between cooling duct and the concrete substrate, significant for construction quality, reduction executive cost, the save energy of raising large volume concrete structural.
Heat conduction functional fluid kind and preparation method thereof mainly contains at present:
1) phase change material emulsion
Phase change material emulsion is phase change material directly to be dispersed in form emulsion in the water.The method for preparing at present phase change material emulsion mainly contains emulsification pretreatment and two kinds of methods of ultrasonic emulsification.Emulsification pretreatment be develop early, Application Areas method widely, be with liquid through the rotor of high speed rotating and the gap between the fixed stator, make liquid receive great shear forces and the emulsive method.Emulsification pretreatment method consumption energy consumption duration, the diameter of emulsion hanging drop is difficult to continue refinement after reaching certain limit, make its use receive certain limitation; Ultrasonic emulsification is meant under the ultrasonic energy effect, utilizes hyperacoustic " cavitation effect ", makes two or more immiscible liquid mix the formation dispersion system, and wherein a kind of liquid is evenly distributed among another liquid and forms the technological process of milk sap.Ultrasonic emulsification has when joint, advantage such as energy-conservation, has obtained to use comparatively widely.
Phase change material emulsion is as heat-conducting fluid, not only requires phase chatoyance feed liquid in the emulsion to drip and has suitable concentration and size distribution, also requires drop in use to keep good suspension stability simultaneously.But solid-liquid phase change constantly takes place in phase change material in temperature changing process, is easy to cause the gathering caking of phase change material, and then problems such as evaporation efficiency reduction, cooling duct obstruction occur, makes its application receive very big restriction.
2) phase-change material micro-capsule suspension-s
Form micro-capsule with the high molecular polymer coating phase-change materials, and microcapsule are scattered in form suspension-s in the water, just can be formed on the functional fluid that phase transition temperature interval has the higher capacity of heat transmission.At present, the technology of preparing of phase-change material micro-capsule is comparatively ripe, and the phase change material in the heat-conducting fluid is owing to there is the polymer shell parcel, and microcapsule suspensions is difficult for blocking pipe, has higher application feasibility than phase change material emulsion.But because the particle diameter of phase-change material micro-capsule is less, microcapsule granule attracts each other easily under the effect of Van der Waals force and bumps and be attached on together, causes the fluidic suspension stability to reduce greatly.Simultaneously, conditions such as the potential of hydrogen of suspension system, concentration also can produce bigger influence to its stability.The stability of phase-change material micro-capsule suspension-s is its important restraining factors that obtain the ideal application effect.
Summary of the invention
The present invention is directed to the stable imperfect shortcoming of present phase-change material micro-capsule suspension-s, a kind of heat-conducting fluid that is used to reduce internal temperature rise of mass concrete and preparation method thereof is provided, taken into account the satisfactory stability property and the higher capacity of heat transmission.
Technical scheme of the present invention is: a kind of heat-conducting fluid that is used to reduce internal temperature rise of mass concrete; Being a kind of microcapsule suspensions, is dispersoid with the cetane microcapsule, is liquid carrier with water; Adopting the Walocel MT 20.000PV of 0.2-0.3%wt is dispersion agent; The potential of hydrogen of liquid system is that the concentration of pH=7-9, phase change material cetane microcapsule is 10-30%wt, and the wall material of described cetane microcapsule is polyureas-melamine resin, and transformation temperature is 17.42 ℃; Enthalpy of phase change is 147.93J/g, and particle size range is 1.51-10.48um.
The concrete preparation process of the described heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is following:
Walocel MT 20.000PV is dissolved in 50-70 ℃ the water, its molecule can fully be stretched in water, solution postcooling to the room temperature that is mixed with 5%wt is for use;
The cetane microcapsule of 1 mass parts is joined in the water of 3-10 mass parts; Adopt the digital display type stirrer to stir 10-15min under the room temperature with the rotating speed of 200-300r/min; The Walocel MT 20.000PV solution that adds the 5%wt of 0.04-0.06 mass parts in the whipping process; Make the Walocel MT 20.000PV molecular adsorption at the phase-change material micro-capsule particle surface, and then make generation mixing steric hindrance repulsion effect between the microcapsule granule, process the comparatively stable phase-change material micro-capsule suspension-s of performance;
Low whipping speed is under the 200-300r/min condition; The NaOH solution that in phase-change material micro-capsule suspension-s, slowly drips 10%wt is regulated pH=8 ± 1; Under the 200-300r/min rotating speed, stir 10min after dropwising again; Make the sterically hindered effect of Walocel MT 20.000PV be able to give full play to, be prepared into the heat-conducting fluid that the stable phase-change material micro-capsule suspension-s of suspension property just is used to reduce internal temperature rise of mass concrete.
Beneficial effect:
1. concentration is that demixing phenomenon does not appear in the cetane microcapsule suspension-s of 20%wt in 72h, and suspension stability is high.
2. phase-change material micro-capsule suspension-s has higher apparent specific heat in phase transition temperature interval.The high specific heat of the suspension-s of 10%wt, 20%wt, 30%wt microcapsule concentration can reach 7.137J/g ℃, 7.779J/g ℃, 8.716J/g ℃ respectively, is respectively 1.70,1.86 and 2.08 times of water.
3. the concentration phase-change material micro-capsule suspension-s that is respectively 10%wt, 20%wt, 30%wt has good flowability, and its viscosity Engler increases 5%wt, 9%wt and 21%wt than water respectively, and increasing degree is little, good fluidity.
4. temperature is respectively 15 ℃ and 25 ℃ in the gangway, cooling liquid speed is 16L/m
3Under h, concrete sample half adiabatic condition; To adopt concentration be 20% phase-change material micro-capsule suspension-s is respectively 6.6 ℃ and 4.1 ℃ as heat-eliminating medium to the reduction of inside concrete temperature rise with adopting water as the cold-zone medium, and cooling extent is respectively 18.0% and 28.9% of peak temperature rise.
Description of drawings
Fig. 1 dispersion agent kind is to the influence of microcapsule suspensions stability.
Fig. 2 Walocel MT 20.000PV volume is to the influence of microcapsule suspensions stability.
Fig. 3 system potential of hydrogen is to the influence of phase-change material micro-capsule stability of suspension.
The specific heat of Fig. 4 different concns phase-change material micro-capsule suspension-s.
The viscosity of Fig. 5 different concns phase-change material micro-capsule suspension-s.
The different heat-eliminating mediums of Fig. 6 are to the cooling-down effect of concrete test block.
Embodiment
Below in conjunction with accompanying drawing the present invention is made and to specify.
A kind of heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is a kind of microcapsule suspensions, is dispersoid with the cetane microcapsule; With water is liquid carrier, and adopting the Walocel MT 20.000PV of 0.25%wt is dispersion agent, and the potential of hydrogen of liquid system is that the concentration of pH=8, phase change material cetane microcapsule is 20%wt; The wall material of described cetane microcapsule is polyureas-melamine resin; Transformation temperature is 17.42 ℃, and enthalpy of phase change is 147.93J/g, and particle size range is 1.51-10.48um.
The concrete preparation process of the described heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is following:
Walocel MT 20.000PV is dissolved in 70 ℃ the water, its molecule can fully be stretched in water, solution postcooling to the room temperature that is mixed with 5%wt is for use;
The cetane microcapsule of 1 mass parts is joined in the water of 4 mass parts; Adopt the digital display type stirrer to stir 10-15min under the room temperature with the rotating speed of 200-300r/min; Adding quality in the whipping process is the Walocel MT 20.000PV solution of the 5%wt of 0.04M; Make the Walocel MT 20.000PV molecular adsorption at the phase-change material micro-capsule particle surface, and then make generation mixing steric hindrance repulsion effect between the microcapsule granule, process the comparatively stable phase-change material micro-capsule suspension-s of performance;
Low whipping speed is under the 200-300r/min condition; The NaOH solution that in phase-change material micro-capsule suspension-s, slowly drips 10%wt is regulated pH=8; Under the 200-300r/min rotating speed, stir 10min after dropwising again; Make the sterically hindered effect of Walocel MT 20.000PV be able to give full play to, be prepared into the heat-conducting fluid that the stable phase-change material micro-capsule suspension-s of suspension property just is used to reduce internal temperature rise of mass concrete.
Embodiment 2
A kind of heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is a kind of microcapsule suspensions, is dispersoid with the cetane microcapsule; With water is liquid carrier, and adopting the Walocel MT 20.000PV of 0.2%wt is dispersion agent, and the potential of hydrogen of liquid system is that the concentration of pH=7, phase change material cetane microcapsule is 10%wt; The wall material of described cetane microcapsule is polyureas-melamine resin; Transformation temperature is 17.42 ℃, and enthalpy of phase change is 147.93J/g, and particle size range is 1.51-10.48um.
The concrete preparation process of the described heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is following:
Walocel MT 20.000PV is dissolved in 60 ℃ the water, its molecule can fully be stretched in water, solution postcooling to the room temperature that is mixed with 5%wt is for use;
The cetane microcapsule of 1 mass parts is joined in the water of 9 mass parts; Adopt the digital display type stirrer to stir 10-15min under the room temperature with the rotating speed of 200-300r/min; Adding quality in the whipping process is the Walocel MT 20.000PV solution of the 5%wt of 0.04M; Make the Walocel MT 20.000PV molecular adsorption at the phase-change material micro-capsule particle surface, and then make generation mixing steric hindrance repulsion effect between the microcapsule granule, process the comparatively stable phase-change material micro-capsule suspension-s of performance;
Low whipping speed is under the 200-300r/min condition; The NaOH solution that in phase-change material micro-capsule suspension-s, slowly drips 10%wt is regulated pH=7; Under the 200-300r/min rotating speed, stir 10min after dropwising again; Make the sterically hindered effect of Walocel MT 20.000PV be able to give full play to, be prepared into the heat-conducting fluid that the stable phase-change material micro-capsule suspension-s of suspension property just is used to reduce internal temperature rise of mass concrete.
A kind of heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is a kind of microcapsule suspensions, is dispersoid with the cetane microcapsule; With water is liquid carrier, and adopting the Walocel MT 20.000PV of 0.3%wt is dispersion agent, and the potential of hydrogen of liquid system is that the concentration of pH=9, phase change material cetane microcapsule is 25%wt; The wall material of described cetane microcapsule is polyureas-melamine resin; Transformation temperature is 17.42 ℃, and enthalpy of phase change is 147.93J/g, and particle size range is 1.51-10.48um.
The concrete preparation process of the described heat-conducting fluid that is used to reduce internal temperature rise of mass concrete is following:
Walocel MT 20.000PV is dissolved in 50 ℃ the water, its molecule can fully be stretched in water, solution postcooling to the room temperature that is mixed with 5%wt is for use;
The cetane microcapsule of 1 mass parts is joined in the water of 3 mass parts; Adopt the digital display type stirrer to stir 10-15min under the room temperature with the rotating speed of 200-300r/min; Adding quality in the whipping process is the Walocel MT 20.000PV solution of the 5%wt of 0.06M; Make the Walocel MT 20.000PV molecular adsorption at the phase-change material micro-capsule particle surface, and then make generation mixing steric hindrance repulsion effect between the microcapsule granule, process the comparatively stable phase-change material micro-capsule suspension-s of performance;
Low whipping speed is under the 200-300r/min condition; The NaOH solution that in phase-change material micro-capsule suspension-s, slowly drips 10%wt is regulated pH=9; Under the 200-300r/min rotating speed, stir 10min after dropwising again; Make the sterically hindered effect of Walocel MT 20.000PV be able to give full play to, be prepared into the heat-conducting fluid that the stable phase-change material micro-capsule suspension-s of suspension property just is used to reduce internal temperature rise of mass concrete.
Fig. 1 is the influence of dispersion agent kind to microcapsule suspensions stability, and various dispersion agent volumes are 0.1% of microcapsule quality.Can know that by Fig. 1 the stable difference of the phase-change material micro-capsule suspension-s of the dispersion agent preparation of employing different varieties is obvious.Be at volume under the situation of 0.1%wt, it is best to adopt Walocel MT 20.000PV to do the stability of suspension of dispersion agent preparation, and it is longer to begin to occur the obvious stratified time; And adopt the stability of suspension of other two kinds of dispersion agent preparations relatively poor, it is also shorter to begin to occur the stratified time.
Fig. 2 is the influence of Walocel MT 20.000PV volume to microcapsule suspensions stability, the pH=7 of suspension-s system.Can know by Fig. 2; Along with the increase of Walocel MT 20.000PV volume, the layering volume of phase-change material micro-capsule suspension-s reduces afterwards earlier and increases, when the Walocel MT 20.000PV volume is 0.2-0.3%; The layering volume of phase-change material micro-capsule suspension-s is minimum, has higher suspension stability; So when preparing phase-change material micro-capsule suspension-s as the heat conduction functional fluid, the optimum mix amount of dispersion agent Walocel MT 20.000PV is 0.2-0.3%
Fig. 3 is the influence of system potential of hydrogen to the phase-change material micro-capsule stability of suspension, and the Walocel MT 20.000PV volume is 0.2% of a microcapsule quality.Can know that by 3 the potential of hydrogen of suspension system has obvious influence to the stability of phase-change material micro-capsule suspension-s.The pH value is between 7～9, and stability of suspension is better.At this moment Walocel MT 20.000PV almost completely acts on the phase-change material micro-capsule particle surface, and the sterically hindered effect of Walocel MT 20.000PV macromolecular chain is bigger, and suspensoid has advantages of higher stability; The pH value is lower than at 7 o'clock, and high affine absorption takes place for phase-change material micro-capsule particle and Walocel MT 20.000PV, and s-adsorption increases; The consumption of required Walocel MT 20.000PV increases; This moment, the sterically hindered effect of macromolecular chain reduced, thereby the tendency of flocculation of suspensoid is bigger, less stable; The pH value reduces because the adsorptive capacity of Walocel MT 20.000PV increases with pH value greater than after 9, remaining Walocel MT 20.000PV molecule entering liquid phase; Its concentration is increased; The bridging effect of macromolecular chain also increases, and causes the tendency of flocculation of system to increase, and stability of suspension descends; When the pH value was 8 ± 1, system stability was best, and the Walocel MT 20.000PV molecular chain fully stretches, and under the effect of space steric effect, made the dispersing property of system reach optimum regime.So when preparing phase-change material micro-capsule suspension-s as the heat conduction functional fluid, system pH is that 8 ± 1 o'clock stability is best.
Fig. 4 is the specific heat of different concns phase-change material micro-capsule suspension-s.Can know that by Fig. 4 in phase transition temperature interval, the specific heat that concentration is respectively 10%, 20%, 30% suspension-s obviously increases, be respectively 7.137J/g ℃, 7.779J/g ℃ and 8.716J/g ℃, be respectively 1.70 times, 1.86 times and 2.08 times of water than thermal peak.The phase-change material micro-capsule granule density is high more in the suspension-s, and the quality of materials that solid-liquid phase change takes place in phase transition temperature interval is many more, and the heat of absorption is also many more, and it is big more to show as maximum instantaneous specific heat; The phase-change material micro-capsule suspension-s of different concns is between 18.5-19.0 ℃ than the temperature that thermal peak occurs, and this is by the transformation temperature decision of core in the microcapsule; In non-transformation temperature district, the phase-change material micro-capsule granule density is high more, and the specific heat of combustion of suspension-s is low more.Though it is the specific heat of suspension-s all is lower than water in non-phase transition temperature interval, less with the specific heat of water difference.This is because phase-change material micro-capsule specific heat of self when not undergoing phase transition is lower than water and causes.In phase transition temperature interval, the specific heat of phase-change material micro-capsule suspension-s obviously increases, and explains that its capacity of heat transmission obviously increases.
Fig. 5 is the viscosity of different concns phase-change material micro-capsule suspension-s.Can know that by Fig. 5 along with the increase of phase-change material micro-capsule concentration, the viscosity of suspension-s is increase trend.Concentration is respectively 10%wt, 20%wt, 30%wt phase-change material micro-capsule suspension-s increases by 5%, 9% and 21% respectively than its viscosity Engler of water, and increasing degree is less, has good flowability.
Fig. 6 is the cooling-down effects of different heat-eliminating mediums to concrete test block.Can be known that by Fig. 6 do not taking under the cooling provision situation, the top temperature in the concrete test block is 52.6 ℃, peak temperature rise is 22.8 ℃.Adopt water and phase-change material micro-capsule suspension-s to be respectively 48.5 ℃ and 46 ℃ as the top temperature in the heat-eliminating medium concrete test block, thermal spike reduces by 4.1 ℃ and 6.6 ℃ respectively, and cooling extent is respectively 18.0% and 28.9% of peak temperature rise.The cooling-down effect of phase-change material micro-capsule suspension-s is apparently higher than the cooling-down effect of water.
Claims (3)
1. preparation method who is used to reduce the heat-conducting fluid of internal temperature rise of mass concrete is characterized in that step is:
The first step; The cetane microcapsule of 1 mass parts is joined in the water of 3-10 mass parts, add the Walocel MT 20.000PV aqueous solution of the 5%wt of 0.04-0.06 mass parts under the room temperature while stirring, process phase-change material micro-capsule suspension-s; The wall material of described cetane microcapsule is polyureas-melamine resin; Transformation temperature is 17.42 ℃, and enthalpy of phase change is 147.93J/g, and particle size range is 1.51-10.48um;
In second step, pH=8 ± 1 of the phase-change material micro-capsule suspension-s that the adjusting the first step makes continues to stir to obtain the stable phase-change material micro-capsule suspension-s of suspension property then, just is used to reduce the heat-conducting fluid of internal temperature rise of mass concrete.
2. the preparation method who is used to reduce the heat-conducting fluid of internal temperature rise of mass concrete as claimed in claim 1 is characterized in that stirring velocity is 200-300r/min.
3. the preparation method who is used to reduce the heat-conducting fluid of internal temperature rise of mass concrete as claimed in claim 1 is characterized in that, adopts 10%wtNaOH solution to regulate the pH value.
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| CN103146355B (en) * | 2011-12-07 | 2016-02-10 | 北京中石伟业科技股份有限公司 | A kind of heat-sink material |
| KR101192718B1 (en) * | 2012-01-31 | 2012-10-18 | 이원목 | A materials construction with PCM micro capsule and method for manufacturing same |
| CN103113853A (en) * | 2013-01-18 | 2013-05-22 | 青岛科技大学 | Suspension stabilized phase change energy storage fluid and preparation method thereof |
| CN114804731B (en) * | 2022-03-18 | 2023-01-24 | 中煤地建设工程有限公司 | Large-volume concrete and preparation method thereof |
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