CN115594433A - Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate - Google Patents

Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate Download PDF

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CN115594433A
CN115594433A CN202211306291.8A CN202211306291A CN115594433A CN 115594433 A CN115594433 A CN 115594433A CN 202211306291 A CN202211306291 A CN 202211306291A CN 115594433 A CN115594433 A CN 115594433A
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waste red
red brick
paraffin
waste
phase change
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CN115594433B (en
Inventor
刘铁
蒋俊
金超
卢忠远
李军
朱勤业
陈静
吴艳萍
黄金桥
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Ningbo Construction Engineering Group Co ltd
Southwest University of Science and Technology
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Ningbo Construction Engineering Group Co ltd
Southwest University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a preparation method of waste red brick phase-change aggregate and the waste red brick phase-change aggregate, wherein the preparation method comprises the following steps: (1) Crushing the waste red bricks after the impurities are removed into particles; (2) Calcining the granular waste red bricks, and cooling the waste red bricks to normal temperature for later use; (3) Adding paraffin into a container, heating for melting, immersing the spare waste red brick particles processed in the step (2) into liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin; (4) Reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state; (5) And (5) coating the paraffin-absorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin. The waste red brick phase-change aggregate prepared by the preparation method can improve the heat conductivity coefficient of the waste red brick, and enhance the heat conduction and phase-change heat storage capacity of the waste red brick aggregate.

Description

Preparation method of waste red brick phase-change aggregate and waste red brick phase-change aggregate
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of waste red brick phase-change aggregate and the waste red brick phase-change aggregate.
Background
On the one hand, the phase change energy storage materials appearing in recent years gradually become a new favorite of building energy-saving materials. The phase-change energy storage material is doped into the existing building material to prepare the phase-change energy storage enclosure structure, so that the heat absorption and release functions of the enclosure structure can be greatly enhanced, a small amount of material can store and release a large amount of heat, and the phase-change energy storage enclosure structure has the characteristics of both common building materials and the phase-change energy storage material.
On the other hand, the harmless disposal or recycling of a huge amount of construction waste has been the focus of social attention. Due to the fact that old urban buildings mainly adopt brick-concrete structures and the like, the proportion of waste red bricks in building wastes is relatively high. However, in the prior art, waste red bricks are often directly crushed and then mixed into mortar or concrete, and the waste red bricks mainly comprise quartz, feldspar, illite, kaolinite and the like, wherein the heat conductivity of minerals such as the feldspar, the illite, the kaolinite and the like is poorer than that of the quartz, so that the heat conductivity of the red bricks is lower, and in an enclosure structure with a phase-change energy storage material, the heat exchange between environmental heat and the phase-change energy storage material is not facilitated, the heat storage and release efficiency is low, and the temperature regulation and control effect is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of waste red brick phase change aggregate, which can improve the heat conductivity coefficient of waste red bricks and enhance the heat conduction and phase change heat storage capacity of the waste red brick aggregate.
The invention provides a technical scheme for preparing waste red brick phase-change aggregate, which comprises the following steps:
(1) Crushing the waste red bricks after the impurities are removed into particles;
(2) Calcining the granular waste red bricks, and cooling the waste red bricks to normal temperature for later use;
(3) Adding paraffin into a container, heating to melt the paraffin, immersing the waste red brick particles processed in the step (2) for later use into liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin;
(4) Reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state;
(5) And (3) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
After the steps are adopted, the preparation method of the waste red brick phase change aggregate has the following advantages:
in the step (2) of the preparation method, the waste red brick particles in the step (1) are subjected to heat treatment, and low-heat-conductivity minerals such as feldspar in the aluminosilico minerals in the waste red brick particles are treated at the heat treatment temperature, wherein CaO in the red brick is calcium oxide, alkali and Fe 2 O 3 I.e. iron sesquioxide, tiO 2 Under the action of the auxiliary melting components such as titanium dioxide and the like, high-heat-conductivity minerals such as quartz and mullite are gradually generated, so that the heat conductivity coefficient of the waste red brick particles is improved, and the heat conductivity of the waste red brick phase-change aggregate is enhanced.
Coating the paraffin-adsorbed waste red brick particles with the paraffin in the solid state in the paraffin step (4) by using an aqueous epoxy resin, so that the paraffin is not leaked, and the mortar and the concrete performance are prevented from being degraded due to the fact that the paraffin slowly leaks out of the concrete or the mortar; meanwhile, paraffin leakage is prevented from influencing the interface of the phase change aggregate and the cement paste, so that the problem of poor interface adhesion is avoided, and the high quality of the waste red brick phase change aggregate which is prepared by the preparation method and has common building materials and phase change energy storage materials is ensured.
When the waste red brick phase change aggregate prepared by the preparation method is applied to concrete, when the environmental temperature rises, minerals such as quartz, mullite and the like with high thermal conductivity in waste red brick particles in which paraffin in the waste red brick phase change aggregate is subjected to heat treatment rapidly generate heat exchange with the environment, the solid state is changed into the liquid state, the external heat is absorbed, and the indoor temperature is ensured to be stabilized within a certain range; when the external environment temperature is reduced, the paraffin in the waste red brick phase-change aggregate is converted into a solid state from a liquid state, heat is released, the indoor temperature is maintained to be stabilized within a certain range, the operation of temperature control equipment can be reduced, energy consumption is reduced, and the phase-change heat storage capacity is stronger.
Further, the preparation method of the waste red brick phase change aggregate further comprises the step (6) of coating the waste red brick phase change aggregate obtained in the step (5) with powder before the aqueous epoxy resin is completely cured. After the steps are adopted, the paraffin wax waste red brick phase change particles coated by the water-based epoxy resin can be easily separated from each other, the agglomeration phenomenon is not easy to generate, the processing process is more convenient, and the heat conductivity of the phase change aggregate shell prepared by the preparation method can be further improved.
Further, the powder is a mixture of one or more of graphite powder, carbon nano powder and graphene in any proportion. After the steps are adopted, the heat conductivity coefficient of the powder is very high, heat can be quickly transferred to paraffin in the phase change aggregate prepared by the preparation method for storage, and the heat conductivity coefficient of the phase change aggregate prepared by the preparation method is also high.
Furthermore, the powder is one or a mixture of more of cement, fly ash and mineral powder according to any proportion. After the steps are adopted, the powder has certain hydration activity, the interface bonding force between the phase change aggregate prepared by the preparation method and cement paste in concrete can be increased, the concrete which permeates the phase change aggregate prepared by the preparation method has better integral strength, the heat conductivity coefficient of the powder is higher than that of solidified aqueous epoxy resin, and the integral heat conductivity coefficient of the phase change aggregate prepared by the preparation method can be further improved.
Further, the diameter of the particles in the step (1) is 2-30mm. After the steps are adopted, the phase change aggregate prepared by the preparation method has stronger practicability as a building aggregate material, and the parameters such as porosity, phase change enthalpy, heat conductivity coefficient and the like are more suitable for being applied to a building envelope structure with heat storage and heat release functions.
Further, the calcining temperature in the step (2) is 1150-1250 ℃, and the furnace cooling is carried out after the heat preservation is carried out for 5-30 min. After the steps are adopted, in the preferable calcining temperature range and the preferable heat preservation time range, the low-heat-conductivity minerals such as feldspar in the aluminosilico minerals in the red brick grains are abandoned, and CaO in the red brick is calcium oxide, alkali and Fe 2 O 3 I.e. iron sesquioxide, tiO 2 Under the action of the melting-assisting components such as titanium oxide and the like, the probability of generating high-heat-conductivity minerals such as quartz and mullite is higher, the heat conductivity coefficient of the waste red brick particles is further improved, and the heat conductivity of the waste red brick particles is further enhanced.
Further, when the waste red brick particles in the step (3) are soaked in liquid paraffin, the vacuum degree above the liquid level of the liquid paraffin in the closed container is 0.001-0.1MPa; the separation is carried out after 10-60 minutes of immersion. After the steps are adopted, gas in pores of the waste red brick particles can be discharged as much as possible by setting negative pressure, so that the waste red brick particles after heat treatment adsorb liquid paraffin as much as possible, and the phase-change heat storage capacity of the phase-change aggregate prepared by the preparation method is improved.
Further, the mass ratio of the aqueous epoxy resin A glue to the aqueous epoxy resin B glue in the step (5) is 3; the curing time of the water-based epoxy resin is 18-22min. After the steps are adopted, the curing time is adopted within the mass ratio range of the aqueous epoxy resin A glue and the aqueous epoxy resin B glue, so that the paraffin waste red brick particles coated with the aqueous epoxy resin can be easily separated from each other, and the paraffin leakage rate is reduced to be lower.
The invention aims to solve another technical problem of providing the waste red brick phase change aggregate which can improve the heat conductivity coefficient of the waste red brick and enhance the heat conduction and phase change heat storage capacity of the waste red brick aggregate.
The other technical scheme of the invention is that the waste red brick phase change aggregate is prepared by adopting the preparation method of any one of the technical schemes; the porosity of the waste red brick phase-change aggregate is 25.4-35.1%; the melting temperature of the paraffin is 21.6-41.4 ℃; the phase change enthalpy of the composite material is 40.13-68.86J/g; the thermal conductivity is 1.38-1.84W/(m.K); the liquid paraffin leakage rate is 0-0.08%.
After adopting the structure, the waste red brick phase change aggregate has the following advantages: the waste red brick phase change aggregate has higher heat conductivity coefficient and stronger heat conductivity. When the waste red brick phase-change aggregate is applied to concrete, when the environmental temperature rises, minerals such as quartz, mullite and the like with high thermal conductivity in waste red brick particles are subjected to heat treatment by paraffin in the waste red brick phase-change aggregate to quickly generate heat exchange with the environment, the solid state is changed into the liquid state, the external heat is absorbed, and the indoor temperature is ensured to be stabilized within a certain range; when the external environment temperature is reduced, the paraffin in the waste red brick phase-change aggregate is converted into a solid state from a liquid state, heat is released, the indoor temperature is maintained to be stable within a certain range, the operation of temperature control equipment can be reduced, energy consumption is reduced, and the phase-change heat storage capacity is strong.
Further, the porosity of the waste red brick phase-change aggregate is 25.4%; the melting temperature of the paraffin is 21.6-38.1 ℃; the phase change enthalpy of the waste red brick phase change aggregate is 40.13-49.34J/g; the heat conductivity coefficient is 1.63-1.84W/(m.K); the liquid paraffin leakage rate is 0-0.05%. After the structure is adopted, the heat conductivity coefficient, the heat conductivity and the phase change heat storage capacity of the waste red brick phase change aggregate can be further enhanced.
Drawings
FIG. 1 is an XRD pattern of the waste red brick particles treated in step (2) of example 3 of the production process of the present invention (feldspar, mullite and quartz are taken as examples only).
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It is to be noted that the description of the embodiments is provided to aid understanding of the present invention, and is not intended to limit the present invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to a preparation method of waste red brick phase-change aggregate and the waste red brick phase-change aggregate.
It is understood that energy storage is also known as energy storage. Powder coating is also known as encapsulation. Powder is also called powder. Liquids are also referred to as liquid phases or liquid states. Solids are also referred to as solid phases or solid states. The prepared product is also called prepared or prepared. mm is also known as millimeter. min is also called minutes. W/(m.K) can also be written as W/m.K.
The preparation method of the waste red brick phase change aggregate comprises the following steps:
(1) And crushing the waste red bricks after the impurities are removed into particles.
The impurities in the waste red bricks can be removed before the waste red bricks are crushed. The impurities comprise one or more of hardened cement, broken stones, pebbles, reinforcing steel bars and spoil. In actual operation, the method can be manually selected, only the waste red bricks are selected, and then hardened cement materials and the like on the waste red bricks are manually removed by a mud knife. Of course, the method can also be used to remove steel and iron impurities such as steel bars and the like by adopting a magnet adsorption mode of a mechanical adsorption device, then remove impurities such as broken stones, pebbles and spoil by using a mechanical sieve which is smaller than the waste red bricks but larger than the broken stones, pebbles and spoil, then clamp each waste red brick by using a mechanical device such as a clamp, destroy cement hardened substances on the waste red bricks by using a drill bit and the like, and then screen out the cement hardened substances destroyed into fragments. The waste red bricks can be crushed into particles by a hammer crusher. The particles may have a diameter of 2-30mm.
(2) And calcining the granular waste red bricks, and cooling the waste red bricks to normal temperature for later use along with the furnace.
The calcination temperature is preferably 1150-1250 ℃, and the furnace cooling is preferably carried out after the heat preservation is preferably 5-30 min.
(3) Adding paraffin into a container, heating to melt the paraffin, immersing the waste red brick particles processed in the step (2) for later use in liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin.
When the waste red brick particles are soaked in the liquid paraffin, the sealed container can be vacuumized, and the vacuum degree above the liquid level of the liquid paraffin in the sealed container can be 0.001-0.1MPa. The immersion time can be 10 to 60 minutes, in which case the red bricks no longer adsorb paraffin and then separation is carried out, for example by filtering the red brick particles adsorbed with paraffin with a screen.
(4) And reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state.
In the actual operation process, the container filled with the red brick particles adsorbed with the paraffin can be placed in a cold air conditioning room or a cold storage box for cooling. It is understood that the waste red brick particles which are treated by the step and have been in a solid state and adsorbed with the paraffin can be easily separated manually if part of the paraffin of the particles is adhered to each other. Of course, it may be divided by a commercially available disperser.
(5) And (3) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
In practice, the aqueous epoxy resin a and B glues with relatively low viscosity can be purchased, and it is understood that the curing agent is already contained therein, and the mass ratio of the aqueous epoxy resin a and the aqueous epoxy resin B is preferably 3. It will be understood that the relatively low tack aqueous epoxy resin glues A and B can be obtained by only specifying to the vendor that the relatively low tack aqueous epoxy resin glues A and B are to be purchased.
As will be understood, the curing of the waterborne epoxy resin has two meanings, one is the curing without coating the powder, such as curing at normal temperature, and the curing time of the waterborne epoxy resin is preferably 18-22min. If the coating aqueous epoxy resins of the cured partial waste red brick phase change aggregates are adhered to each other, the coating aqueous epoxy resins can be separated by a commercially available dispersion machine.
Or, the other is curing after coating the powder:
the preparation method of the waste red brick phase change aggregate can also comprise the following steps (6): and (4) before the waterborne epoxy resin is completely cured, coating the waste red brick phase change aggregate obtained in the step (5) by using powder, so that the waterborne epoxy resin adhesion among particles can be prevented. And curing, such as at room temperature.
The powder material can be one or a mixture of graphite powder, carbon nano powder and graphene according to any proportion.
The powder material can also be one or a mixture of more of cement, fly ash and mineral powder according to any proportion.
In actual operation, before the waterborne epoxy resin is completely cured, the waste red brick phase change aggregate obtained in the step (5) is placed into a container containing the powder, and the container rolls in the powder, so that the surface of the powder is coated with more than one layer of powder.
The waste red brick phase change aggregate is prepared by adopting the preparation method of any one of the technical schemes.
The DSC test of the prior art, also called differential scanning calorimetry test, is carried out on the waste red brick phase change aggregate obtained after the waterborne epoxy resin which is not coated with the powder and is prepared by the method is cured, and if the used crucible can be a common crucible such as an aluminum crucible; the testing temperature range can be low temperature (-20 ℃) to 100 ℃; the temperature rise and fall speed can be 5 ℃/min; the atmosphere may be nitrogen; the equipment model can be NETZSCH DSC 214; the sample form is that the phase-change waste red brick aggregate, namely the phase-change waste red brick particle, is obtained after the prepared waterborne epoxy resin which is not coated with powder is cured.
The waste red brick phase-change aggregate prepared by the method of the invention after curing the water-based epoxy resin without coating the powder is subjected to a heat conduction test in the prior art, larger phase-change red brick particles with the diameter of about 28mm are selected, the surface of the particles is ground flat, and the particles are tested at room temperature according to GB/T32064-2015 transient planar heat source test method for building materials, namely Hunan Tan Hunan apparatus DRE-2C.
The test results are shown in the following table:
Figure BDA0003906173050000061
the data show that the porosity of the waste red brick phase-change aggregate can be 25.4-35.1%; the melting temperature of the paraffin wax can be 21.6-41.4 ℃; the phase change enthalpy of the phase change aggregate can be 40.13-68.86J/g; the thermal conductivity can be 1.38-1.84W/(m.K); the liquid paraffin leakage rate can be 0-0.08%.
The data also show that the porosity of the waste red brick phase-change aggregate is preferably 25.4%; the melting temperature of the paraffin is preferably 21.6-38.1 ℃; the phase change enthalpy of the phase change aggregate is preferably 40.13-49.34J/g; the thermal conductivity is 1.63-1.84W/(m.K); the liquid paraffin leakage rate is 0-0.05%.
The above data also indicate that the heat conductivity coefficient of the waste red brick particles without impregnated paraffin is reduced along with the increase of the porosity, but after the paraffin is impregnated, the heat conductivity coefficient of the aggregate can be increased, and along with the increase of the porosity of the red brick, the phase change enthalpy of the phase change aggregate is increased, the number of pores is large, the phase change paraffin is contained, the phase change enthalpy is high, the heat storage capacity is high, and the influence of the change of the external environment temperature in the building is small.
The table selects 5 kinds of paraffin with different melting temperatures for comparison tests, which shows that the aggregate after adsorbing the paraffin can store certain heat, namely phase change enthalpy, and can play a role in buffering, so that the temperature in a building can not generate great change along with the change of the external environment.
The porosity in the table is respectively 25.4%, 30.2% and 35.1%, which shows that the waste red brick phase change aggregate has good universality, small porosity has good technical effect, and large porosity also has good technical effect.
The above data support and demonstrate the advantages, i.e., technical effects, described in the summary above.
The invention will be further illustrated with reference to specific examples:
example 1
The preparation method of the waste red brick phase change aggregate comprises the following steps:
(1) And crushing the waste red bricks after the impurities are removed into particles.
Impurities in the waste red bricks are removed before the waste red bricks are crushed. The waste red bricks can be crushed into particles by a hammer crusher. The particle diameter may be 2-20mm.
(2) And calcining the granular waste red bricks, and cooling the waste red bricks to normal temperature for later use along with the furnace.
The calcination temperature is preferably 1200 ℃, and the furnace cooling is preferably carried out after the heat preservation is preferably 15 min.
(3) Adding paraffin into a container, heating to melt the paraffin, immersing the waste red brick particles processed in the step (2) for later use in liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin.
The specific operation can be as follows: heating paraffin to 50 ℃ to melt the paraffin, vacuumizing the closed container when the waste red brick particles are soaked in liquid paraffin, wherein the vacuum degree above the liquid phase paraffin liquid level in the closed container can be 0.001-0.1MPa, and the soaking time can be 50 minutes, and then filtering the red brick particles adsorbed with the paraffin by using a screen.
(4) And reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state.
And (3) placing the container filled with the red brick particles adsorbed with the paraffin in a cold air-conditioning room to reduce the temperature so that the paraffin is in a solid state. The paraffin wax with the adhesion was manually separated by hand or separated by a commercially available dispenser.
(5) And (3) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
Commercially available water-based epoxy resin A glue and water-based epoxy resin B glue with relatively low viscosity can be adopted, the mass ratio of the water-based epoxy resin A glue to the water-based epoxy resin B glue is preferably 3.
The curing described in example 1, i.e. one without covering the powder, was: curing at normal temperature, wherein the curing time of the water-based epoxy resin is 18min. The aqueous epoxy resin of the coating layer of the cured partial waste red brick phase change aggregate is adhered to each other and can be separated by a commercially available dispersion machine.
The waste red brick porosity of the waste red brick phase change aggregate prepared by the preparation method of the embodiment 1 is 35.1%; the melting temperature of the paraffin is 29.2 ℃; the phase change enthalpy of the phase change aggregate is 56.48J/g; the thermal conductivity is 1.57W/(m.K); the liquid paraffin leakage rate was 0.05%.
Example 2
The preparation method of the waste red brick phase change aggregate comprises the following steps:
(1) And crushing the waste red bricks after the impurities are removed into particles.
Impurities in the waste red bricks are removed before the waste red bricks are crushed. The waste red bricks can be crushed into particles by a hammer crusher. The particles may have a diameter of 15-25mm.
(2) And calcining the granular waste red bricks, and cooling the waste red bricks to normal temperature for later use along with the furnace.
The calcination temperature is preferably 1250 ℃, and the furnace cooling is preferably carried out after the heat preservation is preferably 50 min.
(3) Adding paraffin into a container, heating for melting, immersing the waste red brick particles processed in the step (2) into liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin.
The specific operation can be as follows: heating paraffin to 50 deg.C to melt paraffin, vacuum-pumping the sealed container when the waste red brick granules are soaked in liquid paraffin, wherein the vacuum degree above the liquid paraffin level in the sealed container can be 0.001-0.1MPa, and soaking time can be 50min, and filtering the red brick granules adsorbed with paraffin by using a screen.
(4) And reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state.
And (3) placing the container filled with the red brick particles adsorbed with the paraffin in a cold air conditioning room to reduce the temperature so that the paraffin is in a solid state. The paraffin wax having the adhesion was separated by a commercially available disperser.
(5) And (5) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
The adhesive is prepared from the purchased water-based epoxy resin A adhesive and purchased water-based epoxy resin B adhesive which are relatively low in viscosity, wherein the mass ratio of the water-based epoxy resin A adhesive to the water-based epoxy resin B adhesive is preferably 3. The curing described in example 2, i.e. the other being the curing after coating the powder:
and (6) coating the waste red brick phase change aggregate obtained in the step (5) with powder before the waterborne epoxy resin is completely cured, placing the powder into a container filled with the powder, rolling the powder, and coating a layer of powder on the surface of the powder, wherein the powder can be cement. And curing at normal temperature, wherein the curing time of the water-based epoxy resin can be 22min.
The waste red brick porosity of the waste red brick phase change aggregate prepared by the preparation method of the embodiment 2 is 30.2%; the melting temperature of the paraffin is 29.2 ℃; the phase change enthalpy of the composite material is 48.80J/g; the thermal conductivity is 1.65W/(m.K); the liquid paraffin leakage rate was 0.02%.
Example 3
The preparation method of the waste red brick phase change aggregate comprises the following steps:
(1) And crushing the waste red bricks after the impurities are removed into particles.
Removing impurities in the waste red bricks before crushing the waste red bricks. The waste red bricks can be crushed into particles by a hammer crusher. The particle diameter may be 15-30mm.
(2) And after the granular waste red bricks are calcined, cooling the calcined waste red bricks to the normal temperature along with the furnace for later use.
The calcination temperature is preferably 1150 ℃, and the furnace cooling is preferably carried out after the heat preservation is preferably 30 min.
As shown in FIG. 1, the granular waste red brick granules calcined in step (2) of example 3 were subjected to XRD test or X-ray diffraction of the prior art to obtain red brick granulesOn the XRD map, it can be seen that CaO in the waste red brick particles, namely calcium oxide, alkali and Fe, is generated in the red brick particles in the heat treatment process 2 O 3 I.e. iron sesquioxide, tiO 2 Under the action of the melting-assisting components such as titanium dioxide, the low-heat-conductivity minerals such as feldspar and the like are mainly gradually converted into the high-heat-conductivity minerals such as quartz, mullite and the like, so that the heat conductivity coefficient of the waste red brick particles is improved. After the waste red brick particles are subjected to heat treatment as in example 3, the thermal conductivity of the waste red brick particles with the porosity of 25.4% is 0.42W/(mK) before the heat treatment, and the thermal conductivity of the waste red brick particles is 1.9W/(mK) after the heat treatment.
(3) Adding paraffin into a container, heating to melt the paraffin, immersing the waste red brick particles processed in the step (2) for later use in liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin.
The specific operation can be that the paraffin is heated to 50 ℃ to melt the paraffin, when the waste red brick particles are soaked in the liquid paraffin, the sealed container can be vacuumized, the vacuum degree above the liquid phase paraffin liquid level in the sealed container can be 0.001-0.1MPa, the soaking time can be 40 minutes, and then the red brick particles absorbed with the paraffin are filtered by a screen.
(4) And reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state.
And (3) placing the container filled with the red brick particles adsorbed with the paraffin in a cold air conditioning room to reduce the temperature so that the paraffin is in a solid state. The paraffin wax having the adhesion was separated by a commercially available disperser.
(5) And (3) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
The coating is carried out at normal temperature by using the purchased water-based epoxy resin A glue and water-based epoxy resin B glue with relatively low viscosity, wherein the mass ratio of the water-based epoxy resin A glue to the water-based epoxy resin B glue is preferably 3. The curing described in example 3, i.e. the other being the curing after coating the powder:
and (6) coating the waste red brick phase change aggregate obtained in the step (5) with powder before the waterborne epoxy resin is completely cured, placing the powder into a container filled with the powder, rolling the powder to coat a layer of powder on the surface of the powder, wherein the powder can be a mixture of graphite powder, carbon nano powder and graphene in any proportion. And curing at normal temperature, wherein the curing time of the water-based epoxy resin can be 20min.
The waste red brick porosity of the waste red brick phase-change aggregate prepared by the preparation method of the embodiment 3 is 25.4%; the melting temperature of the paraffin is 21.6 ℃; the phase change enthalpy of the composite material is 40.13J/g; the thermal conductivity is 1.84W/(m.K); the liquid paraffin leakage rate was 0.05%.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The preparation method of the waste red brick phase change aggregate is characterized by comprising the following steps:
(1) Crushing the waste red bricks after the impurities are removed into particles;
(2) Calcining the granular waste red bricks, and cooling the calcined granular waste red bricks to normal temperature for later use;
(3) Adding paraffin into a container, heating to melt the paraffin, immersing the waste red brick particles processed in the step (2) for later use into liquid paraffin, and separating the waste red brick particles adsorbed with the paraffin;
(4) Reducing the temperature of the waste red brick particles adsorbed with the paraffin so that the adsorbed paraffin is in a solid state;
(5) And (3) coating the paraffin-adsorbed waste red brick particles with solid paraffin in the step (4) by using aqueous epoxy resin, and curing the aqueous epoxy resin to obtain the waste red brick phase change aggregate.
2. The preparation method of the waste red brick phase-change aggregate according to claim 1, characterized by comprising the following steps: and (6) coating the waste red brick phase change aggregate obtained in the step (5) with powder before the water-based epoxy resin is completely cured.
3. The preparation method of the waste red brick phase change aggregate according to claim 2, characterized in that: the powder is one or a mixture of a plurality of graphite powder, carbon nano powder and graphene according to any proportion.
4. The preparation method of the waste red brick phase change aggregate according to claim 2, characterized in that: the powder material is one or a mixture of more of cement, fly ash and mineral powder according to any proportion.
5. The preparation method of the waste red brick phase change aggregate according to claim 2, characterized in that: the diameter of the particles in the step (1) is 2-30mm.
6. The preparation method of the waste red brick phase change aggregate according to claim 1, which is characterized in that: in the step (2), the calcining temperature is 1150-1250 ℃, and the furnace is cooled after the heat preservation is carried out for 5-30 min.
7. The preparation method of the waste red brick phase-change aggregate according to claim 1, characterized by comprising the following steps: when the waste red brick particles in the step (3) are soaked in the liquid paraffin, the vacuum degree above the liquid paraffin liquid level in the closed container is 0.001-0.1MPa; the separation is carried out after 10-60 minutes of immersion.
8. The preparation method of the waste red brick phase-change aggregate according to claim 1, characterized by comprising the following steps: the mass ratio of the aqueous epoxy resin A glue to the aqueous epoxy resin B glue in the step (5) is 3; the curing time of the water-based epoxy resin is 18-22min.
9. The waste red brick phase change aggregate is characterized in that: prepared by the preparation method of any one of claims 1 to 8; the porosity of the waste red brick phase-change aggregate is 25.4-35.1%; the melting temperature of the paraffin is 21.6-41.4 ℃; the phase change enthalpy of the composite material is 40.13-68.86J/g; the heat conductivity coefficient is 1.38-1.84W/(m.K); the liquid paraffin leakage rate is 0-0.08%.
10. The waste red brick phase change aggregate of claim 9, wherein: the porosity of the waste red bricks of the waste red brick phase-change aggregate is 25.4%; the melting temperature of the paraffin is 21.6-38.1 ℃; the phase change enthalpy of the composite material is 40.13-49.34J/g; the heat conductivity coefficient is 1.63-1.84W/(m.K); the liquid paraffin leakage rate is 0-0.05%.
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CN108609935A (en) * 2018-07-18 2018-10-02 绍兴市中等专业学校 A kind of environment-friendly phase change decoration mortar and preparation method thereof based on polymeric phase change material
CN112279593A (en) * 2020-11-02 2021-01-29 江苏绿和环境科技有限公司 Method for preparing recycled concrete small hollow building block by using waste red brick grinding powder
CN112608053A (en) * 2020-12-18 2021-04-06 中建西部建设北方有限公司 Modified aggregate, preparation method and concrete using modified aggregate
CN114032073A (en) * 2021-11-22 2022-02-11 西南科技大学 Preparation method of slag expanded bead composite phase-change material

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WO2017043983A1 (en) * 2015-09-07 2017-03-16 Politechnika Rzeszowska im. Ignacego Łukasiewicza Insulating and accumulation construction partition and a method for its production
CN107129205A (en) * 2017-05-15 2017-09-05 浙江海洋大学 A kind of materials for wall and preparation method thereof
CN108609935A (en) * 2018-07-18 2018-10-02 绍兴市中等专业学校 A kind of environment-friendly phase change decoration mortar and preparation method thereof based on polymeric phase change material
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