CN110372301B - Temperature and humidity regulating cement-based mortar and preparation method thereof - Google Patents
Temperature and humidity regulating cement-based mortar and preparation method thereof Download PDFInfo
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- CN110372301B CN110372301B CN201910703062.1A CN201910703062A CN110372301B CN 110372301 B CN110372301 B CN 110372301B CN 201910703062 A CN201910703062 A CN 201910703062A CN 110372301 B CN110372301 B CN 110372301B
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- aluminum nitride
- phase change
- epoxy acrylate
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a temperature and humidity adjusting cement-based mortar and a preparation method thereof. The cement-based mortar is prepared from the following raw materials in addition to water: 8-12 wt% of aluminum nitride/phase change material/epoxy acrylate functional monomer, 19-24 wt% of cement, 10-14 wt% of fly ash, 0.4-1.2 wt% of water reducing agent, 0.05-0.7 wt% of expanding agent, 0.05-0.6 wt% of air entraining agent and 55-61 wt% of sand; in the aluminum nitride/phase change material/epoxy acrylate functional monomer, the phase change material is filled in the aluminum nitride as a core material, and the surface of the aluminum nitride is coated with an epoxy acrylate layer. The temperature and humidity regulating cement-based mortar based on the aluminum nitride/phase change material/epoxy acrylate functional monomer has good heat and humidity storage performance, high heat and heat absorption and humidity release efficiency and good mechanical property.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to temperature and humidity adjusting cement-based mortar and a preparation method thereof.
Background
With the continuous promotion of industrialization, the acceleration of urbanization process and the dense urban population, the heat island effect is increasingly obvious, the requirement of human beings on the comfort of indoor environment is higher and higher, the good indoor environment can lead people to be delightful and energetic, the working efficiency is improved, and the adjustment of the indoor comfort such as temperature and humidity through power equipment is certainly a little overhead. Under the circumstance that the contradiction between modern energy shortage and demand is increasingly highlighted, the requirement that the indoor comfort is improved and the energy is saved and the consumption is reduced is a considerable problem. Therefore, in the field of building, research on building energy-saving technology with passive adjustment capability is an important direction, and cement-based mortar has a high heat-moisture contact area as a building material widely applied.
Therefore, the cement-based mortar with the temperature and humidity adjusting performance has wide application prospect in the aspects of solving the problems of human living environment comfort, saving energy and reducing consumption.
Disclosure of Invention
The invention aims to solve the technical problem of providing a temperature and humidity adjusting cement-based mortar and a preparation method thereof aiming at the defects of the prior art. The cement-based mortar with multiple performances of temperature and humidity adjustment provided by the invention has good heat and humidity storage performance, and high heat absorption, heat release, moisture absorption and moisture release efficiency.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the cement-based mortar is prepared from the following raw materials in addition to water: 8-12 wt% of aluminum nitride/phase change material/epoxy acrylate functional monomer, 19-24 wt% of cement, 10-14 wt% of fly ash, 0.4-1.2 wt% of water reducing agent, 0.05-0.7 wt% of expanding agent, 0.05-0.6 wt% of air entraining agent and 55-61 wt% of sand; the aluminum nitride/phase change material/epoxy acrylate functional monomer comprises aluminum nitride, a phase change material serving as a phase change core material and filled in the aluminum nitride, and an epoxy acrylate layer coated on the surface of the aluminum nitride.
According to the scheme, the water-cement ratio is 0.4-0.6.
According to the scheme, the phase transition temperature of the aluminum nitride/phase change material/epoxy acrylate functional monomer is 31.2-33.1 ℃, the phase transition enthalpy is 150.1-179.7J/g, the load capacity of the phase change material is 200-260%, the heat conductivity coefficient is 34-45W/mK, the water absorption rate is 93.7-103.8%, and the average particle size is 5-15 μm.
According to the scheme, the phase change material is palmitic acid and capric acid, and the mass ratio of the palmitic acid to the capric acid is (5-9): 4.
According to the scheme, the aluminum nitride/phase change material/epoxy acrylate functional monomer is obtained by filling a hollow part of mesoporous aluminum nitride through a surface through hole of the hollow mesoporous aluminum nitride by taking a phase change material as a phase change core material and then coating the phase change material/epoxy acrylate functional monomer with epoxy acrylate.
According to the scheme, the ultrasonic time in the step (b) is 1-3 h.
According to the scheme, the cement is P.I 42.5 portland cement.
According to the scheme, the sand is standard sand with the fineness modulus of 0.5-2.0 mm.
According to the scheme, the average particle size of the fly ash is 8-12 mu m.
According to the scheme, the water reducing agent is prepared from 20-70 parts by weight of polycarboxylic acid water reducing agent and 1-5 parts by weight of lignosulfonic acid water reducing agent, and the water reducing rate is more than 25%.
According to the scheme, the expanding agent is one of hydrated calcium sulphoaluminate expanding agents and calcium aluminate expanding agents.
According to the scheme, the air entraining agent is one of sodium dodecyl sulfate and methyl cellulose ether.
The preparation method of the temperature and humidity regulating cement-based mortar comprises the following steps: placing cement, fly ash, an expanding agent, an air entraining agent and a water reducing agent in a stirrer according to a water-cement ratio of 0.4-0.6, stirring for 40-90 s, then adding sand, stirring for 40-90 s, and finally adding an aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer, stirring for 20-50 s to prepare the temperature and humidity regulating cement-based mortar.
The aluminum nitride/phase change material/epoxy acrylate functional monomer comprises aluminum nitride, a phase change material serving as a phase change core material and filled in the aluminum nitride, and an epoxy acrylate layer coated on the surface of the aluminum nitride.
The preparation method of the aluminum nitride/phase change material/epoxy acrylate functional monomer comprises the following steps:
(a) heating and melting the phase-change material, and fully mixing to prepare a phase-change core material;
(b) ultrasonically treating 10-50 parts by weight of hollow mesoporous aluminum nitride and 40-150 parts by weight of the phase change core material obtained in the step (a) to enable the phase change core material to enter the mesoporous aluminum nitride through a surface through hole of the hollow mesoporous aluminum nitride, and filling the hollow part of the mesoporous aluminum nitride to obtain a phase change unit;
(c) adding 50-200 parts of the phase change unit obtained in the step (b) into a reaction kettle, adding 20-120 parts of epoxy-acrylate emulsion and 1-10 parts of alcohol auxiliary agent, fully stirring, stirring at 35-50 ℃ until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/phase change material/epoxy acrylate functional monomer.
The hollow structure of the hollow mesoporous aluminum nitride in the aluminum nitride/phase change material/epoxy acrylate functional monomer can provide a cavity load with higher capacity, the phase change material enters the hollow mesoporous aluminum nitride sphere through a through hole on the surface of the hollow mesoporous aluminum nitride sphere, and then the surface hole of the aluminum nitride sphere is coated by epoxy acrylate ester, so that the performance of adjusting the environmental humidity can be realized, the surface hole of the aluminum nitride sphere can be sealed, the phase change material in the cavity can be effectively prevented from leaking, and finally, a three-layer spherical shell structure is formed, wherein the innermost layer is a phase change core material, the middle layer is an aluminum nitride wall material, and the surface layer is an epoxy acrylate aluminum nitride/phase change material/epoxy acrylate functional monomer.
The temperature and humidity adjusting cement-based mortar provided by the invention has excellent performance, higher mechanical strength and phase change core material loading capacity, and effectively controls the defect that the strength of the current market product is greatly reduced along with the increase of the mixing amount of a temperature adjusting unit. When the environmental temperature exceeds 31 ℃, the phase-change core material in the functional unit cavity in the mortar is converted from a solid state to a liquid state, and a large amount of energy is absorbed along with the conversion; when the temperature is lower than 31 ℃, the core material is converted from a liquid state to a solid state, and a large amount of energy is released to achieve the temperature regulation and maintain the performance of temperature stability.
The invention has considerable latent heat capacity of temperature regulation, and can improve the extremely high latent heat to maintain the temperature of the environment for a long time or change in a larger temperature. The wall material aluminum nitride also has extremely high heat conductivity to make up the defects of low heat conductivity and slow temperature regulation of the products in the market. When the humidity of the epoxy acrylate on the surface layer is higher than the environmental equilibrium humidity, the epoxy acrylate can absorb water rapidly to prevent the environmental humidity from being increased, and compared with other humidity-controlling coatings, the epoxy acrylate humidity-controlling coating has the advantages of strong humidity storage capacity, high humidity absorbing and releasing speed and capability of effectively improving the environmental humidity.
In conclusion, the temperature and humidity adjusting cement-based mortar and the preparation method thereof provided by the invention have the following beneficial effects:
(1) the aluminum nitride/phase change material/epoxy acrylate functional monomer provided by the invention has the advantages of good dispersibility, large load capacity of the phase change material, good coating of the epoxy acrylate, and high heat conductivity and mechanical strength.
(2) The temperature and humidity regulating cement-based mortar based on the aluminum nitride/phase change material/epoxy acrylate functional monomer has good heat and humidity storage performance, high heat and heat absorption and humidity release efficiency and good mechanical property. The wall body prepared by the mortar can effectively adjust indoor relative heat and humidity, and provides a more comfortable and friendly living environment.
(3) The method has the advantages of simple process, no harmful waste generated in the preparation and production process, greenness, safety, wide raw material source and accordance with the requirements of sustainable development.
Detailed Description
The preparation method of the aluminum nitride/phase change material/epoxy acrylate functional monomer comprises the following steps:
example 1
(a) Heating and melting palmitic acid and capric acid (mass ratio is 5:4) in a hydrothermal magnetic stirrer and fully mixing to prepare a phase-change core material; (b) putting 30 parts by weight of mesoporous aluminum nitride and 70 parts by weight of the phase change core material obtained in the step (a) into a filter flask and connecting the filter flask with a vacuum pump, and carrying out ultrasonic treatment for 1 hour in a water bath environment at 60 ℃ to obtain a phase change unit; (c) adding 50 parts by weight of the phase change unit prepared in the step (b) into a reaction kettle, adding 30 parts by weight of epoxy acrylate emulsion and 1 part by weight of alcohol auxiliary agent in a water bath environment at 35 ℃, fully stirring until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer.
Example 2
(a) Heating and melting palmitic acid and capric acid (mass ratio 6:4) in a hydrothermal magnetic stirrer and fully mixing to prepare a phase-change core material; (b) putting 10 parts by weight of mesoporous aluminum nitride and 40 parts by weight of the phase change core material obtained in the step (a) into a filter flask and connecting the filter flask with a vacuum pump, and carrying out ultrasonic treatment for 1.5 hours in a water bath environment at 60 ℃ to obtain a phase change unit; (c) adding 70 parts by weight of the phase change unit prepared in the step (b) into a reaction kettle, adding 80 parts by weight of epoxy-acrylate emulsion and 5 parts by weight of alcohol auxiliary agent in a water bath environment at 40 ℃, fully stirring until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer.
Example 3
(b) Heating and melting palmitic acid and capric acid (mass ratio of 7:4) in a hydrothermal magnetic stirrer and fully mixing to prepare a phase-change core material; (b) putting 40 parts by weight of mesoporous aluminum nitride and 110 parts by weight of the phase change core material obtained in the step (a) into a filter flask and connecting the filter flask with a vacuum pump, and carrying out ultrasonic treatment for 2 hours in a water bath environment at 60 ℃ to obtain a phase change unit; (c) adding 160 parts by weight of the phase change unit prepared in the step (b) into a reaction kettle, adding 120 parts of epoxy-acrylate emulsion and 9 parts of alcohol auxiliary agent in a water bath environment at 45 ℃, fully stirring until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer.
Example 4
Heating and melting palmitic acid and capric acid (mass ratio of 9:4) in a hydrothermal magnetic stirrer and fully mixing to prepare a phase-change core material; (b) putting 50 parts by weight of mesoporous aluminum nitride and 150 parts by weight of the phase change core material obtained in the step (a) into a filter flask and connecting the filter flask with a vacuum pump, and carrying out ultrasonic treatment for 3 hours in a water bath environment at 60 ℃ to obtain a phase change unit; (c) adding 200 parts by weight of the prepared phase change unit obtained in the step (b) into a reaction kettle, adding 20 parts of epoxy-acrylate emulsion and 10 parts of alcohol auxiliary agent in a water bath environment at 500 ℃, fully stirring until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer.
The hollow mesoporous spherical aluminum nitride wall material is prepared by taking aluminum powder as a precursor, referring to the conventional Nanosized aluminum nitride porous spheres formed through a self-supporting Solid-gas interface reaction of Jie Zheng and [ J ] Journal of Solid State Chemistry 180(2007) 276-283, heating the wall material in an ammonia atmosphere, and reacting the wall material based on the Cokender effect mechanism.
Preparing temperature and humidity regulating cement-based mortar:
preparing the temperature and humidity regulating cement-based mortar by using the aluminum nitride/phase change material/epoxy acrylate functional monomer prepared in the embodiment according to the following dosage ratio: 8-12 wt% of aluminum nitride/phase change material/epoxy acrylate functional monomer, 19-24 wt% of cement, 10-14 wt% of fly ash, 0.4-1.2 wt% of water reducing agent, 0.05-0.7 wt% of expanding agent, 0.05-0.6 wt% of air entraining agent, 55-61 wt% of sand and 0.4-0.6 of water-cement ratio. The raw materials and mass ratios used in the examples are shown in Table 1.
TABLE 1
The water reducing agent is prepared from a polycarboxylic acid water reducing agent and a lignosulfonic acid water reducing agent, the expanding agent is a hydrated calcium sulphoaluminate expanding agent, and the air entraining agent is methyl cellulose ether.
The humidity regulating performance of the temperature and humidity regulating cement-based mortar prepared by the embodiment of the invention can be used for detecting the equilibrium moisture content and the humidity absorbing and releasing speed of the mortar according to the national standard GB/T20312-2006 moisture and humidity performance and moisture absorption performance measurement of building materials and products at 30 ℃ and a relative humidity 95% climate box method; detecting the phase change temperature, the phase change latent heat and the specific heat capacity of the mortar according to the building material industry standard JC/2111-2012 test method for the phase change temperature regulation performance of the building material; the mechanical property of the mortar is tested according to the national standard GB/T17671-1999 method for testing cement mortar strength for 28 days.
The performance data for each example is shown in table 2.
TABLE 2
As shown in Table 2, compared with the temperature and humidity adjusting cement-based mortar prepared in examples 2 to 6 which is prepared in example 1 (control group) without adding the aluminum nitride/palmitic acid/capric acid/epoxy acrylate functional monomer, the temperature and humidity adjusting performance is good, and the balance moisture content is 0.1576 to 0.2158g/g-1(ii) a The moisture absorbing and releasing speed in the first hour can respectively reach 0.2851-0.2428 and 0.2013-0 of the total equilibrium moisture2553; the phase transition temperature is 30.5-30.8 ℃; the latent heat of phase change is 165.8-170.8 KJ/Kg; a specific heat capacity of 1.16 to 1.40kJ/(Kg & K); the strength of the steel plate is 28-32 MPa after 28 days.
Claims (9)
1. The temperature and humidity regulating cement-based mortar is characterized in that: the cement-based mortar is prepared from the following raw materials in addition to water: 8-12 wt% of aluminum nitride/phase change material/epoxy acrylate functional monomer, 19-24 wt% of cement, 10-14 wt% of fly ash, 0.4-1.2 wt% of water reducing agent, 0.05-0.7 wt% of expanding agent, 0.05-0.6 wt% of air entraining agent and 55-61 wt% of sand; the aluminum nitride/phase change material/epoxy acrylate functional monomer comprises aluminum nitride, a phase change material filled in the aluminum nitride as a phase change core material, and an epoxy acrylate layer coated on the surface of the aluminum nitride, and is obtained by filling a hollow part of mesoporous aluminum nitride through a surface through hole of the hollow mesoporous aluminum nitride by using the phase change material as the phase change core material, and then coating the hollow part with epoxy acrylate.
2. The temperature and humidity regulating cement-based mortar according to claim 1, characterized in that: the water-cement ratio is 0.4-0.6.
3. The temperature and humidity regulating cement-based mortar according to claim 1, characterized in that: the phase transition temperature of the aluminum nitride/phase change material/epoxy acrylate functional monomer is 31.2-33.1 ℃, the phase transition enthalpy is 150.1-179.7J/g, the phase change material load is 200-260%, the heat conductivity coefficient is 34-45W/mK, the water absorption rate is 93.7-103.8%, and the average particle size is 5-15 mu m.
4. The temperature and humidity regulating cement-based mortar according to claim 1, characterized in that: the phase change material is palmitic acid and capric acid, and the mass ratio of the palmitic acid to the capric acid is (5-9): 4.
5. The temperature and humidity regulating cement-based mortar according to claim 1, characterized in that: the cement is P.I 42.5 portland cement; the sand is standard sand with the fineness modulus of 0.5-2.0 mm; the average particle size of the fly ash is 8-12 mu m; the water reducing agent is prepared from 20-70 parts by weight of polycarboxylic acid water reducing agent and 1-5 parts by weight of lignosulfonic acid water reducing agent, and the water reducing rate is more than 25%; the swelling agent is one of hydrated calcium sulphoaluminate swelling agent and calcium aluminate swelling agent; the air entraining agent is one of sodium dodecyl sulfate and methyl cellulose ether.
6. The preparation method of the temperature and humidity adjusting cement-based mortar, according to claim 1, is characterized in that cement, fly ash, an expanding agent, an air entraining agent and a water reducing agent are simultaneously placed in a stirrer according to a water-cement ratio of 0.4-0.6 and stirred for 40-90 s, then sand is added and stirred for 40-90 s, finally aluminum nitride/phase change material/epoxy acrylate functional monomer is added and stirred for 20-50 s, and the temperature and humidity adjusting cement-based mortar is prepared.
7. The aluminum nitride/phase change material/epoxy acrylate functional monomer is characterized in that: the aluminum nitride/phase change material/epoxy acrylate functional monomer comprises aluminum nitride, a phase change material filled in the aluminum nitride as a phase change core material, and an epoxy acrylate layer coated on the surface of the aluminum nitride, and is obtained by filling a hollow part of mesoporous aluminum nitride through a surface through hole of the hollow mesoporous aluminum nitride by using the phase change material as the phase change core material, and then coating the hollow part with epoxy acrylate.
8. The aluminum nitride/phase change material/epoxy acrylate functional monomer of claim 7, wherein: the method is characterized in that: the phase transition temperature of the aluminum nitride/phase change material/epoxy acrylate functional monomer is 31.2-33.1 ℃, the phase transition enthalpy is 150.1-179.7J/g, the phase change material load is 200-260%, the heat conductivity coefficient is 34-45W/mK, the water absorption rate is 93.7-103.8%, and the average particle size is 5-15 mu m.
9. The method for preparing the aluminum nitride/phase change material/epoxy acrylate functional monomer according to claim 8, wherein the method comprises the following steps: the method comprises the following steps:
(a) heating and melting the phase-change material, and fully mixing to prepare a phase-change core material;
(b) ultrasonically treating 10-50 parts by weight of hollow mesoporous aluminum nitride and 40-150 parts by weight of the phase change core material obtained in the step (a) to enable the phase change core material to enter the mesoporous aluminum nitride through a surface through hole of the hollow mesoporous aluminum nitride, and filling the hollow part of the mesoporous aluminum nitride to obtain a phase change unit;
(c) adding 50-200 parts of the phase change unit obtained in the step (b) into a reaction kettle, adding 20-120 parts of epoxy-acrylate emulsion and 1-10 parts of alcohol auxiliary agent, fully stirring, stirring at 35-50 ℃ until the auxiliary agent is completely volatilized, completely adsorbing the epoxy acrylate emulsion on the surface of an aluminum nitride ball, and airing in a natural environment to obtain the aluminum nitride/phase change material/epoxy acrylate functional monomer.
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