CN114560665B - Phase-change thermal-insulation facing mortar for building inner wall and preparation method thereof - Google Patents

Phase-change thermal-insulation facing mortar for building inner wall and preparation method thereof Download PDF

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CN114560665B
CN114560665B CN202210358428.8A CN202210358428A CN114560665B CN 114560665 B CN114560665 B CN 114560665B CN 202210358428 A CN202210358428 A CN 202210358428A CN 114560665 B CN114560665 B CN 114560665B
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facing mortar
phase
expanded perlite
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polyacrylic acid
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CN114560665A (en
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董国胜
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Wuhan Zhigao Environmental Technology Co ltd
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Wuhan Zhigao Environmental Technology Co ltd
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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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/08—Diatomaceous earth
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/14—Minerals of vulcanic origin
    • C04B14/18—Perlite
    • C04B14/185—Perlite expanded
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/30—Oxides other than silica
    • C04B14/301—Oxides other than silica porous or hollow
    • C04B14/302—Aerogels
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials
    • 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
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • 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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/90—Passive houses; Double facade technology

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Building Environments (AREA)

Abstract

The invention provides phase-change thermal-insulation facing mortar for an inner wall of a building, which comprises the following raw materials in parts by weight: 60 parts of ordinary Portland cement, 8-12 parts of diatomite, 20-30 parts of heavy calcium carbonate, 5-10 parts of admixture, 1-3 parts of redispersible emulsion powder, 0.5-1.5 parts of cellulose ether, 20-40 parts of phase-change material, 0.5-1.4 parts of waterproof agent and 1-3 parts of pigment. In addition, the invention also provides a method for preparing the facing mortar, which comprises the following steps: s1, preparing all components according to the proportion; s2, uniformly mixing the components. The facing mortar prepared by the invention has the characteristics of meeting the facing mortar standard in all performances, heat preservation, high mechanical strength, water resistance, bright color and the like.

Description

Phase-change thermal-insulation facing mortar for building inner wall and preparation method thereof
Technical Field
The invention relates to the technical field of facing mortar, in particular to phase-change heat-preservation facing mortar for an inner wall of a building and a preparation method thereof.
Background
The traditional inner wall surface decoration needs to be subjected to working procedures such as leveling mortar plastering, putty coating, paint making and the like, shrinkage and expansion stresses of multiple layers of different materials are inconsistent, peeling is easy to occur among layers, internal stresses are different due to temperature differences, and hollowness, water leakage or peeling among the layers occur; when the mortar is updated, the mortar on the inner layer and the outer layer coating are required to be updated completely, so that a large amount of construction waste is generated. The facing mortar is also called color mortar, is a novel environment-friendly decorative material, can be well bonded with various basal planes (concrete, cement mortar and the like), and has a single-layer structure, so that the internal tension is uniform, and the problems of cracks, cracks and delamination and falling off are avoided; after long-term use, the novel thin-layer facing mortar can be adopted for updating, no building rubbish is generated during updating, and the novel thin-layer facing mortar meets the development trend requirements of safety, environmental protection and energy conservation because the novel thin-layer facing mortar has the characteristics of natural color texture, soft vision, low cost, easy construction and the like, and is widely applied to decoration and protection of the surface of the inner wall of a building.
With the development of the construction industry, the demand for facing mortar for the surface of the inner wall of a building is becoming more and more diversified, and for example, heat preservation has become one of the common additional properties of facing mortar for the inner wall of a building. The fatty acid phase-change material is a hot spot in the field of energy-saving building material research in recent years, and is often added into building interior wall facing mortar with high requirements on heat preservation. However, in the prior art, the mechanical strength of the facing mortar is often greatly reduced when the phase-change material is doped into the facing mortar, and meanwhile, the problem that the phase-change material is easy to leak exists.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides phase-change thermal-insulation facing mortar for an inner wall of a building, which comprises the following raw materials in parts by weight:
further, the preparation method of the phase change material comprises the following steps:
s1, mixing a silane coupling agent, polyacrylic acid and water, regulating the pH value to 5.5, adding expanded perlite, reacting for 2 hours at 80 ℃, and then filtering, washing and drying to obtain polyacrylic acid-expanded perlite;
and S2, submerging the mixed liquid of the liquid n-decanoic acid and the alcohol in the polyacrylic acid-expanded perlite, then carrying out adsorption treatment, and then carrying out drying treatment to obtain the phase change material.
Further, in the step S2, the flooding manner is as follows: pouring the polyacrylic acid-expanded perlite into a three-neck flask, and slowly dripping the mixed liquid of the liquid n-decanoic acid and the alcohol into the three-neck flask until the polyacrylic acid-expanded perlite is submerged; the adsorption treatment is as follows: and (3) vacuumizing the three-neck flask, heating in a constant-temperature water bath, and filling air into the three-neck flask for adsorption, wherein the adsorption time is 2 hours, and the temperature of the constant-temperature water bath is 70 ℃. Because polyacrylic acid is grafted on the surface of the expanded perlite, but not loaded in the expanded perlite, the porous structure in the expanded perlite can be reserved, and the porous structure is convenient for adsorbing the phase change material n-capric acid; the vacuum treatment can reduce the air pressure in the pores of the expanded perlite, and after the vacuum degree is reduced, the air pressure difference is formed between the inside and the outside of the expanded perlite, so that the n-decanoic acid enters the pores of the expanded perlite, and the n-decanoic acid adsorbed in the pores of the expanded perlite is not easy to flow out due to capillary action.
Further, in step S1, the weight ratio of the silane coupling agent, the polyacrylic acid, the water and the expanded perlite is 1.5:0.8:14:1, and in step S2, the weight ratio of the liquid n-decanoic acid, the alcohol and the polyacrylic acid-expanded perlite is 1.1:2.1:1.
Further, the admixture comprises bauxite powder and rice hull powder.
Further, the waterproofing agent is polydimethylsiloxane.
Further, the pigment is an inorganic pigment.
In addition, the invention also provides a method for preparing the phase-change thermal-insulation facing mortar for the building inner wall, which comprises the following steps:
s1, preparing raw materials, namely preparing ordinary Portland cement, diatomite, heavy calcium carbonate, admixture, redispersible emulsion powder, cellulose ether, phase change material, waterproofing agent and pigment according to a proportion;
s2, uniformly mixing the raw materials in the step S1 to obtain the facing mortar.
When the decorative surface mortar is used, the facing mortar and water are uniformly stirred according to the weight ratio of 1:0.3 to obtain slurry, and the slurry is smeared on the surface of the inner wall of a building to form a decorative layer. The facing mortar prepared by the invention has the characteristics of meeting the facing mortar standard in all performances, along with good heat preservation performance, high mechanical strength, good waterproof performance, bright color and the like.
The phase change material is used in facing mortar, and can effectively improve the heat preservation performance of the facing mortar. The expanded perlite is used as an adsorption carrier of the phase-change material, so that a large amount of n-capric acid of the phase-change material can be effectively and reliably stored, the phase-change material is adsorbed and packaged in the porous material, and the leakage problem of the phase-change material when combined with facing mortar is avoided; the invention grafts the polyacrylic acid on the surface of the expanded perlite to form the polyacrylic acid-expanded perlite by the silane coupling agent, and the polyacrylic acid is grafted on the surface of the expanded perlite instead of being loaded in the expanded perlite, thus the porous structure in the expanded perlite can be reserved, the porous structure is convenient for adsorbing the phase change material n-decanoic acid, and the polyacrylic acid can form stable compounds with metal ions in components such as silicate cement, thereby effectively improving the tensile strength of facing mortar.
The diatomite has the characteristics of large porosity, light weight, heat insulation and wear resistance, is beneficial to improving the heat insulation performance of the facing mortar, has the main component of silicon dioxide, can react with calcium hydroxide generated in the hydration process of ordinary Portland cement to form a cementing material, and can increase the adhesiveness of the facing mortar. The rice hull powder is rich in lignin and silicon dioxide, the lignin is a biopolymer with a three-dimensional network structure formed by connecting 3 phenylpropane units with each other through ether bonds and carbon-carbon bonds, and contains a plurality of negative groups, so that positively charged particles can be adsorbed to bond components in the facing mortar, the bonding strength of the facing mortar is improved, the silicon dioxide can react with calcium hydroxide generated in the hydration process of ordinary Portland cement to form a cementing material, and the bonding strength of the facing mortar is further improved.
The bauxite powder has small expansion coefficient, high refractoriness and good chemical stability, and can improve the refractory performance of facing mortar; the redispersible emulsion powder has outstanding bonding strength, can improve the adhesiveness, flexural strength, waterproofness, plasticity, wear resistance and workability of facing mortar, and can also improve the cracking resistance and shrinkage performance of the facing mortar. The polydimethylsiloxane has good weather resistance, can improve the waterproof performance of the facing mortar, and can also lead the color of the facing mortar to be brighter.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
Examples 1 to 4:
examples 1-4 provide phase-change thermal-insulation facing mortar for building inner walls, which comprises the following components in parts by weight; wherein the waterproof agent is polydimethylsiloxane, and the pigment is inorganic pigment; the phase change temperature of the phase change material is 29-31 ℃; the preparation method of the phase change material comprises the following steps:
s1, mixing a silane coupling agent, polyacrylic acid and water, regulating the pH value to 5.5, adding expanded perlite, reacting for 2 hours at 80 ℃, and then filtering, washing and drying to obtain polyacrylic acid-expanded perlite;
and S2, submerging the mixed liquid of the liquid n-decanoic acid and the alcohol in the polyacrylic acid-expanded perlite, then carrying out adsorption treatment, and then carrying out drying treatment to obtain the phase change material.
Specifically, in the step S2, the flooding manner is as follows: pouring the polyacrylic acid-expanded perlite into a three-neck flask, and slowly dripping the mixed liquid of the liquid n-decanoic acid and the alcohol into the three-neck flask until the polyacrylic acid-expanded perlite is submerged; the adsorption treatment is as follows: and (3) vacuumizing the three-neck flask, heating in a constant-temperature water bath, and filling air into the three-neck flask for adsorption, wherein the adsorption time is 2 hours, and the temperature of the constant-temperature water bath is 70 ℃. In the step S1, the weight ratio of the silane coupling agent, the polyacrylic acid, the water and the expanded perlite is 1.5:0.8:14:1, and in the step S2, the weight ratio of the liquid n-decanoic acid, the alcohol and the polyacrylic acid-expanded perlite is 1.1:2.1:1.
TABLE 1
The method for preparing the fireproof heat-preservation facing mortar comprises the following steps:
s1, preparing raw materials, namely preparing ordinary Portland cement, diatomite, heavy calcium carbonate, admixture, redispersible emulsion powder, cellulose ether, phase change material, waterproofing agent and pigment according to a proportion;
s2, uniformly mixing the raw materials in the step S1 to obtain the facing mortar.
During construction, the facing mortar and water are uniformly stirred according to the weight ratio of 1:0.3 to obtain slurry, and the slurry is smeared on the surface of the inner wall of the building to form a decorative layer.
Mechanical property test:
the facing mortar prepared in examples 1 to 4 was mixed and stirred uniformly according to the weight ratio of the facing mortar to water of 1:0.3, and left standing for 5 minutes, and then a sample was formed according to the standard requirement. The correlation properties were measured according to the standard of the basic property test method JCT 1024-2019 for wall facing mortar, and the results are shown in Table 2 below.
TABLE 2
As shown in the performance test results of Table 2, the facing mortar prepared by the invention has stronger flexural strength, compressive strength and bonding strength.
And (3) testing heat preservation performance:
the facing mortar prepared in examples 1-4 is mixed and stirred uniformly according to the weight ratio of the facing mortar to water of 1:0.3 to obtain slurry, the slurry is poured into a standard test mold with the thickness of 70.7mm multiplied by 70.7mm, the test mold is vibrated until cement slurry appears on the surface of the slurry, and then scraping off the overflowed slurry at the edge, trowelling to show that the slurry is molded after two days, removing the mold, putting the molded slurry into a standard curing room for curing for 28 days to obtain a mortar test block required by the test, and after drying, testing by using a Hot Disk TPS2500S thermal conductivity tester (probe C5501), wherein the results are shown in the following table 3.
TABLE 3 Table 3
Coefficient of thermal conductivity (W/m.K)
Example 1 0.776
Example 2 0.547
Example 3 0.479
Example 4 0.431
As can be seen from the results in Table 3, the facing mortar prepared by the invention has a lower heat conductivity coefficient, which indicates that the facing mortar prepared by the invention is not easy to conduct heat, and further has a better heat insulation performance.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (4)

1. The phase-change heat-preservation facing mortar for the building inner wall is characterized by comprising the following raw materials in parts by weight:
the admixture comprises bauxite powder and rice hull powder;
the preparation method of the phase change material comprises the following steps:
s1, mixing a silane coupling agent, polyacrylic acid and water, regulating the pH value to 5.5, adding expanded perlite, reacting for 2 hours at 80 ℃, and then filtering, washing and drying to obtain polyacrylic acid-expanded perlite;
s2, submerging the mixed liquid of the liquid n-decanoic acid and the alcohol in the polyacrylic acid-expanded perlite, then carrying out adsorption treatment, and then carrying out drying treatment to obtain the phase change material;
in the step S2, the flooding mode is as follows: pouring the polyacrylic acid-expanded perlite into a three-neck flask, and slowly dripping the mixed liquid of the liquid n-decanoic acid and the alcohol into the three-neck flask until the polyacrylic acid-expanded perlite is submerged; the adsorption treatment is as follows: heating the three-neck flask in a constant-temperature water bath after vacuumizing treatment, and filling air into the three-neck flask for adsorption, wherein the adsorption time is 2 hours, and the temperature of the constant-temperature water bath is 70 ℃;
in the step S1, the weight ratio of the silane coupling agent to the polyacrylic acid to the water to the expanded perlite is 1.5:0.8:14:1, and in the step S2, the weight ratio of the liquid n-decanoic acid to the alcohol to the polyacrylic acid-expanded perlite is 1.1:2.1:1.
2. The phase-change thermal-insulation facing mortar for building interior walls according to claim 1, wherein the water-repellent agent is polydimethylsiloxane.
3. The phase-change thermal-insulation facing mortar for an inner wall of a building according to claim 1, wherein the pigment is an inorganic pigment.
4. A method for preparing the phase-change thermal-insulation facing mortar for building interior walls according to any one of claims 1 to 3, comprising the steps of:
s1, preparing raw materials, namely preparing ordinary Portland cement, diatomite, heavy calcium carbonate, admixture, redispersible emulsion powder, cellulose ether, phase change material, waterproofing agent and pigment according to a proportion;
s2, uniformly mixing the raw materials in the step S1 to obtain the facing mortar.
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