CN111943585A - Environment-friendly phase-change decoration spraying mortar and preparation method thereof - Google Patents
Environment-friendly phase-change decoration spraying mortar and preparation method thereof Download PDFInfo
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- CN111943585A CN111943585A CN202010737734.3A CN202010737734A CN111943585A CN 111943585 A CN111943585 A CN 111943585A CN 202010737734 A CN202010737734 A CN 202010737734A CN 111943585 A CN111943585 A CN 111943585A
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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
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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
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
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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
- 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
- C04B2111/00508—Cement paints
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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
- 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
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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
- C04B2201/30—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
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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 discloses environment-friendly phase change decoration spraying mortar which comprises the following raw materials in parts by weight: 85-95 parts of Portland cement, 24-28 parts of natural sand, 18-22 parts of phase change material, 8-12 parts of self-extinguishing polystyrene particles, 4-6 parts of reinforcing filler, 1.5-2 parts of vinyl acetate copolymer rubber powder, 0.9-1.2 parts of auxiliary agent and 180 parts of tap water; the invention also discloses a preparation method of the mortar. According to the invention, the phase-change material is added into the mortar raw material, the phase-change material is a compound of paraffin and graphene oxide, and the phase-change material has higher thermal conductivity after being compounded with the paraffin and graphene oxide, so that the mortar can be endowed with excellent phase-change performance, and the temperature control performance of the decorative mortar can be effectively improved; through the auxiliary matching of the reinforcing filler and the vinyl acetate copolymer rubber powder, the mechanical strength and the fire resistance of the decorative mortar can be improved, and the environment-friendly phase change decorative spraying mortar with excellent comprehensive performance is obtained, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of building coatings, and particularly relates to environment-friendly phase change decoration spraying mortar and a preparation method thereof.
Background
Decorative mortar refers to mortar used as a facing for buildings. It is a surface decoration which obtains a special decorative surface form through various processing treatments while smearing so as to meet aesthetic requirements. Decorative mortar finishes can be divided into two categories, namely mortar-type finishes and stone-ballast-type finishes. The mortar type facing is a surface decoration with certain color, lines and texture by coloring the mortar or artistic processing of the surface form of the mortar. The stone-ballast decorative surface is made up by mixing various colour stone-ballast as aggregate into cement mortar, making it into cement-ballast slurry and coating it on the surface of wall base layer, then removing surface cement slurry skin by means of water-washing, chopping and grinding to obtain the decorative surface with stone-ballast colour and texture. The cementitious materials used in the decorative mortar are essentially the same as in the conventional finishing mortar, except that the mortar-type finish is more white cement and various pigments are added.
Patent 201210404036.7 discloses a phase change heat storage cement mortar containing rubber powder and a preparation method thereof, and the formula is as follows: 5-40 parts of phase change energy storage material, 100 parts of cement, 280 parts of sand, and 5-30 parts of water, wherein the phase change energy storage material is in a microcapsule structure and comprises a capsule wall and a capsule core, the capsule core is made of organic phase change material, and the capsule wall is made of silicon dioxide-rubber powder composite capsule wall material. The cement mortar disclosed by the invention has the advantages of phase change temperature regulation, long service cycle, excellent physical and chemical properties, environmental protection, no toxicity, wide application range and the like. The phase-change material with a capsule structure is adopted, the effective component of the phase-change material is a single organic phase-change material, and the defect that the heat-conducting property can not meet the use requirement exists.
Disclosure of Invention
The invention aims to provide environment-friendly phase-change decorative spraying mortar and a preparation method thereof, wherein a phase-change material is added into a mortar raw material, the phase-change material is a compound of paraffin and graphene oxide, and the phase-change material has higher thermal conductivity after being compounded, so that the phase-change material can endow the mortar with excellent phase-change performance and can effectively improve the temperature control performance of the decorative mortar; the mechanical strength and the fire resistance of the decorative mortar can be improved by the auxiliary matching of the reinforcing filler and the vinyl acetate copolymer rubber powder, and in addition, the preparation process is simple, the raw materials are easy to obtain and environment-friendly, the environment-friendly phase change decorative spraying mortar with excellent comprehensive performance is obtained, and the application prospect is wide.
The purpose of the invention can be realized by the following technical scheme:
the environment-friendly phase change decoration spraying mortar comprises the following raw materials in parts by weight: 85-95 parts of Portland cement, 24-28 parts of natural sand, 18-22 parts of phase change material, 8-12 parts of self-extinguishing polystyrene particles, 4-6 parts of reinforcing filler, 1.5-2 parts of vinyl acetate copolymer rubber powder, 0.9-1.2 parts of auxiliary agent and 180 parts of tap water;
the decorative spraying mortar is prepared by the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase change material, self-extinguishing polystyrene particles and an auxiliary agent for 3-5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6-8min to obtain the mortar.
Further, the self-extinguishing polystyrene particle has a particle size of 4 to 5 mm.
Further, the auxiliary agent comprises a retarder, a thickener and an air entraining agent, and the mass ratio of the retarder to the thickener to the air entraining agent is 18:17: 7; wherein the retarder is a compound of sodium gluconate and white sugar, and the mass ratio of the sodium gluconate to the white sugar is 1: 4; the thickening agent is a compound obtained by mixing hydroxypropyl methyl cellulose ether and xanthan gum according to the mass ratio of 3: 2.
Further, the reinforcing filler is a compound of mountain flour, heavy calcium carbonate and magnesium-aluminum carbonate hydrotalcite, and the mass ratio of the mountain flour, the heavy calcium carbonate and the magnesium-aluminum carbonate hydrotalcite is 1:2-3: 0.5-0.7.
Further, the phase change material is prepared by the following method:
s1, dispersing graphene oxide in DMF (dimethyl formamide) according to a solid-liquid ratio of 1g:30mL, adding thionyl chloride, carrying out reflux reaction at 80 ℃ for 10-12h, washing a product with dichloromethane after the reaction is finished, and drying in a vacuum oven at 60 ℃ to obtain pretreated graphene oxide;
s2, adding the pretreated graphene oxide, stearyl alcohol, triethylamine, toluene and DMF into a round-bottom flask according to a certain proportion, stirring the mixture at 85 ℃ for 50-60min, performing reflux reaction for 110-120h, filtering, washing with ethanol for 5-6 times, and drying the product in a vacuum oven at 55 ℃ to obtain modified graphene;
s3, enabling the paraffin to be in a completely molten state at the temperature of 65 ℃, adding the modified graphene into the molten paraffin, magnetically stirring for 3-4h at the speed of 450r/min, then carrying out ultrasonic treatment for 20-30min, naturally cooling, solidifying and crushing to obtain the phase-change material.
Further, the amount of thionyl chloride added in step S1 is 3 to 4 times the volume of DMF.
Further, the amount of the pretreated graphene oxide, stearyl alcohol, triethylamine, toluene and DMF in step S2 was 1g:15g:2mL:15mL:5 mL.
A preparation method of environment-friendly phase change decoration spraying mortar comprises the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase change material, self-extinguishing polystyrene particles and an auxiliary agent for 3-5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6-8min to obtain the mortar.
The invention has the beneficial effects that:
the vinyl acetate copolymer rubber powder is added into the mortar raw material, the dry shrinkage rate of the sulphosilicate cement mortar can be improved, and the vinyl acetate copolymer rubber powder has active groups (carbonyl), so that the water consumption required by cement hydration is reduced, the efficiency of hydration water is improved, and pores generated by water evaporation are reduced; secondly, because the vinyl acetate copolymer rubber powder can generate tiny bubbles in the water dispersion process, the bubbles can block capillary tubes in the hardened mortar, thereby reducing the evaporation of water and reducing the drying shrinkage of the hardened cement paste;
according to the invention, the reinforcing filler is added into the mortar raw material, the reinforcing filler is a compound of mountain flour, heavy calcium carbonate and magnesium-aluminum carbonate hydrotalcite, wherein the particle size of the mountain flour is less than 0.075mm, the mountain flour can optimize the hardened pore structure, and the strength and impermeability of the mortar are improved while the sound absorption of the mortar is not influenced; the magnesium-aluminum carbonate hydrotalcite is a layered double metal hydroxide and can provide flame retardant property for the mortar;
adding a phase change material into a mortar raw material, wherein the phase change material is a compound of paraffin and graphene oxide, treating the graphene oxide by thionyl chloride, reacting the thionyl chloride with-COOH on the surface of the graphene oxide to perform acyl chlorination on the surface of the graphene oxide, introducing acyl chloride groups on the surface of the graphene oxide, and reacting the acyl chloride groups with-OH on stearyl alcohol molecules to graft octadecyl molecular chains on the surface of the graphene oxide to form modified graphene oxide; due to the introduction of the long-chain alkane on the surface, the compatibility between the graphene oxide and the paraffin can be improved, and the graphene oxide is uniformly dispersed in the paraffin to form the composite phase-change material; the improvement of the lamellar structure and the surface lipophilicity of the modified graphene enables the van der Waals acting force between the modified graphene oxide and the paraffin to be enhanced, so that the latent heat can be increased to a certain extent, and the heat conducting property of the paraffin is improved; the modified graphene uniformly dispersed in the paraffin can be connected with each other to form a spatial network structure, and the network structures easy to conduct heat form a heat conduction network in the whole composite system due to the ultrahigh heat conduction performance of the graphene material, so that heat can be more quickly transferred through the heat conduction networks and absorbed or released by the phase change material in the phase change process of the composite phase change material, and the heat conductivity of the phase change material is improved;
according to the invention, the phase-change material is added into the mortar raw material, the phase-change material is a compound of paraffin and graphene oxide, the phase-change material has higher thermal conductivity after being compounded, and the phase-change material is added into the mortar, so that the mortar can be endowed with excellent phase-change performance, and the temperature control performance of the decorative mortar can be effectively improved; the mechanical strength and the fire resistance of the decorative mortar can be improved by the auxiliary matching of the reinforcing filler and the vinyl acetate copolymer rubber powder, and in addition, the preparation process is simple, the raw materials are easy to obtain and environment-friendly, the environment-friendly phase change decorative spraying mortar with excellent comprehensive performance is obtained, and the application prospect is wide.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The environment-friendly phase change decoration spraying mortar comprises the following raw materials in parts by weight: 85-95 parts of Portland cement, 24-28 parts of natural sand, 18-22 parts of phase change material, 8-12 parts of self-extinguishing polystyrene particles, 4-6 parts of reinforcing filler, 1.5-2 parts of vinyl acetate copolymer rubber powder, 0.9-1.2 parts of auxiliary agent and 180 parts of tap water;
the particle size of the self-extinguishing type polystyrene particles is 4-5mm, and the cement particles can better wrap the particles by doping the self-extinguishing type polystyrene particles with larger particle size, so the construction performance is better; the self-extinguishing polystyrene particles have good flame-retardant and fireproof performance, and endow the mortar with good flame-retardant and fireproof performance;
the auxiliary agent comprises a retarder, a thickening agent and an air entraining agent, and the mass ratio of the retarder to the thickening agent to the air entraining agent is 18:17: 7; wherein the retarder is a compound of sodium gluconate and white sugar, and the mass ratio of the sodium gluconate to the white sugar is 1: 4; compared with sodium gluconate, white sugar has longer retardation time and more obvious strength enhancement effect, but on the retention capacity of working performance, sodium gluconate has better performance, so that the retarder selects a compound of the two, can play a role in complementing advantages and ensures that wet-mixed pulp has longer open time; the thickening agent is a compound obtained by mixing hydroxypropyl methyl cellulose ether and xanthan gum according to the mass ratio of 3:2, the rheological property of the mortar can be improved by doping the hydroxypropyl methyl cellulose ether, but the water retention capacity of the hydroxypropyl methyl cellulose ether on the mortar is poor, and slight bleeding of the mortar is easily caused, so that the water retention of the mortar is remarkably improved by selecting the xanthan gum for compounding (the water retention rate is not less than 88%);
the vinyl acetate copolymer rubber powder can improve the dry shrinkage rate of the cement mortar containing the hydrosilicate, and active groups (carbonyl) exist in the vinyl acetate copolymer rubber powder, so that the water consumption required by cement hydration is reduced, the efficiency of hydration water is improved, and pores generated by water evaporation are reduced; secondly, because the vinyl acetate copolymer rubber powder can generate tiny bubbles in the water dispersion process, the bubbles can block capillary tubes in the hardened mortar, thereby reducing the evaporation of water and reducing the drying shrinkage of the hardened cement paste;
the reinforcing filler is a compound of mountain flour, heavy calcium carbonate and magnesium-aluminum carbonate hydrotalcite, and the mass ratio of the mountain flour, the heavy calcium carbonate and the magnesium-aluminum carbonate hydrotalcite is 1:2-3: 0.5-0.7; the particle size of the stone powder is less than 0.075mm, the stone powder can optimize the hardened pore structure, and the strength and the impermeability of the mortar are improved while the sound absorption of the mortar is not influenced; the magnesium-aluminum carbonate hydrotalcite is a layered double metal hydroxide and can provide flame retardant property for the mortar;
the phase-change material is prepared by the following method:
s1, dispersing graphene oxide in DMF (dimethyl formamide) according to a solid-liquid ratio of 1g:30mL, adding thionyl chloride (the addition amount of the thionyl chloride is 3-4 times of the volume of the DMF), carrying out reflux reaction at 80 ℃ for 10-12h, washing a product with dichloromethane after the reaction is finished, and drying in a vacuum oven at 60 ℃ to obtain pretreated graphene oxide;
s2, adding the pretreated graphene oxide, stearyl alcohol, triethylamine, toluene and DMF into a round-bottom flask according to a certain proportion, stirring the mixture at 85 ℃ for 50-60min, performing reflux reaction for 110-120h, filtering, washing with ethanol for 5-6 times, and drying the product in a vacuum oven at 55 ℃ to obtain modified graphene;
wherein the dosage ratio of the pretreated graphene oxide to the stearyl alcohol to the triethylamine to the toluene to the DMF is 1g to 15g to 2mL to 15mL to 5 mL;
s3, enabling the paraffin to be in a completely molten state at the temperature of 65 ℃, adding the modified graphene into the molten paraffin, magnetically stirring for 3-4h at the speed of 450r/min, then carrying out ultrasonic treatment for 20-30min, naturally cooling, solidifying and crushing to obtain the phase-change material;
after the graphene oxide is treated by thionyl chloride, reacting the thionyl chloride with-COOH on the surface of the graphene oxide to perform acyl chlorination on the surface of the graphene oxide, introducing acyl chloride groups on the surface of the graphene oxide, and then reacting the acyl chloride groups with-OH on stearyl alcohol molecules to graft octadecyl molecular chains on the surface of the graphene oxide to form modified graphene oxide; due to the introduction of the long-chain alkane on the surface, the compatibility between the graphene oxide and the paraffin can be improved, and the graphene oxide is uniformly dispersed in the paraffin to form the composite phase-change material; the improvement of the lamellar structure and the surface lipophilicity of the modified graphene enables the van der Waals acting force between the modified graphene oxide and the paraffin to be enhanced, so that the latent heat can be increased to a certain extent, and the heat conducting property of the paraffin is improved; the modified graphene uniformly dispersed in the paraffin can be connected with each other to form a spatial network structure, and the network structures easy to conduct heat form a heat conduction network in the whole composite system due to the ultrahigh heat conduction performance of the graphene material, so that heat can be more quickly transferred through the heat conduction networks and absorbed or released by the phase change material in the phase change process of the composite phase change material, and the heat conductivity of the phase change material is improved;
the preparation method of the decorative spraying mortar comprises the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase change material, self-extinguishing polystyrene particles and an auxiliary agent for 3-5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6-8min to obtain the mortar.
Example 1
The environment-friendly phase change decoration spraying mortar comprises the following raw materials in parts by weight: 85 parts of Portland cement, 24 parts of natural sand, 18 parts of phase-change material, 8 parts of self-extinguishing polystyrene particles, 4 parts of reinforcing filler, 1.5 parts of vinyl acetate copolymer rubber powder, 0.9 part of auxiliary agent and 180 parts of tap water;
the decorative spraying mortar is prepared by the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase-change material, self-extinguishing polystyrene particles and an auxiliary agent for 3min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6min to obtain the mortar.
Example 2
The environment-friendly phase change decoration spraying mortar comprises the following raw materials in parts by weight: 90 parts of Portland cement, 26 parts of natural sand, 20 parts of phase-change material, 10 parts of self-extinguishing polystyrene particles, 5 parts of reinforcing filler, 1.8 parts of vinyl acetate copolymer rubber powder, 1.1 parts of auxiliary agent and 190 parts of tap water;
the decorative spraying mortar is prepared by the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase-change material, self-extinguishing polystyrene particles and an auxiliary agent for 4min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 7min to obtain the mortar.
Example 3
The environment-friendly phase change decoration spraying mortar comprises the following raw materials in parts by weight: 95 parts of Portland cement, 28 parts of natural sand, 22 parts of phase-change material, 12 parts of self-extinguishing polystyrene particles, 6 parts of reinforcing filler, 2 parts of vinyl acetate copolymer rubber powder, 1.2 parts of auxiliary agent and 200 parts of tap water;
the decorative spraying mortar is prepared by the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase-change material, self-extinguishing polystyrene particles and an auxiliary agent for 5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 8min to obtain the mortar.
Comparative example
The phase change material in example 1 was changed to paraffin, and the remaining raw materials and preparation process were unchanged.
The mortars obtained in examples 1 to 3 and comparative example were tested for the following properties:
testing the dry density, compressive strength and heat conductivity coefficient of the mortar according to a method specified in GB/T20473-2006 building thermal insulation mortar standard; testing the combustion performance and the fracture energy; the test results are given in the following table:
as can be seen from the above table, the mortars prepared in examples 1-3 had compressive strengths of 1.06-1.07MPa and thermal conductivities of 0.054-0.062W (m.K)-1The combustion performance reaches A1 level, which shows that the mortar prepared by the invention has low heat conductivity coefficient, good mechanical property, good fireproof performance and extremely high comprehensive performance; compared with a comparative example, the thermal conductivity of the paraffin can be improved by compounding the paraffin and the graphene oxide, and the thermal conductivity can be reduced by adding the paraffin and the graphene oxide into the mortar, so that the temperature control performance of the mortar can be better improved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The environment-friendly phase change decoration spraying mortar is characterized by comprising the following raw materials in parts by weight: 85-95 parts of Portland cement, 24-28 parts of natural sand, 18-22 parts of phase change material, 8-12 parts of self-extinguishing polystyrene particles, 4-6 parts of reinforcing filler, 1.5-2 parts of vinyl acetate copolymer rubber powder, 0.9-1.2 parts of auxiliary agent and 180 parts of tap water;
the decorative spraying mortar is prepared by the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase change material, self-extinguishing polystyrene particles and an auxiliary agent for 3-5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6-8min to obtain the mortar.
2. The environment-friendly phase change decorative spraying mortar of claim 1, wherein the self-extinguishing polystyrene particles have a particle size of 4-5 mm.
3. The environment-friendly phase-change decorative spraying mortar of claim 1, wherein the auxiliary agents comprise a retarder, a thickener and an air-entraining agent, and the mass ratio of the retarder, the thickener and the air-entraining agent is 18:17: 7; wherein the retarder is a compound of sodium gluconate and white sugar, and the mass ratio of the sodium gluconate to the white sugar is 1: 4; the thickening agent is a compound obtained by mixing hydroxypropyl methyl cellulose ether and xanthan gum according to the mass ratio of 3: 2.
4. The environment-friendly phase change decorative spraying mortar of claim 1, wherein the reinforcing filler is a compound of mountain flour, heavy calcium carbonate and magnesium aluminum carbonate hydrotalcite, and the mass ratio of the mountain flour, the heavy calcium carbonate and the magnesium aluminum carbonate hydrotalcite is 1:2-3: 0.5-0.7.
5. The environment-friendly phase-change decorative spraying mortar of claim 1, wherein the phase-change material is prepared by the following method:
s1, dispersing graphene oxide in DMF (dimethyl formamide) according to a solid-liquid ratio of 1g:30mL, adding thionyl chloride, carrying out reflux reaction at 80 ℃ for 10-12h, washing a product with dichloromethane after the reaction is finished, and drying in a vacuum oven at 60 ℃ to obtain pretreated graphene oxide;
s2, adding the pretreated graphene oxide, stearyl alcohol, triethylamine, toluene and DMF into a round-bottom flask according to a certain proportion, stirring the mixture at 85 ℃ for 50-60min, performing reflux reaction for 110-120h, filtering, washing with ethanol for 5-6 times, and drying the product in a vacuum oven at 55 ℃ to obtain modified graphene;
s3, enabling the paraffin to be in a completely molten state at the temperature of 65 ℃, adding the modified graphene into the molten paraffin, magnetically stirring for 3-4h at the speed of 450r/min, then carrying out ultrasonic treatment for 20-30min, naturally cooling, solidifying and crushing to obtain the phase-change material.
6. The environment-friendly phase change decorative spraying mortar of claim 5, wherein the addition amount of thionyl chloride in the step S1 is 3-4 times the volume of DMF.
7. The environment-friendly phase change decorative spraying mortar of claim 5, wherein the amount of the pretreated graphene oxide, the stearyl alcohol, the triethylamine, the toluene and the DMF in the step S2 is 1g:15g:2mL:15mL:5 mL.
8. The preparation method of the environment-friendly phase change decoration spraying mortar of claim 1, which is characterized by comprising the following steps:
firstly, compounding and dry-mixing portland cement, natural sand, a phase change material, self-extinguishing polystyrene particles and an auxiliary agent for 3-5min, slowly adding tap water, and uniformly stirring;
and secondly, sequentially adding the reinforcing filler and the vinyl acetate copolymer rubber powder, and blending for 6-8min to obtain the mortar.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045271A (en) * | 2021-03-19 | 2021-06-29 | 龙南县彩艺装饰材料厂 | Energy-saving dry-mixed mortar and production method thereof |
| CN113735503A (en) * | 2021-08-26 | 2021-12-03 | 江阴市龙宇节能科技有限公司 | Polyphenyl-phase change composite thermal insulation material and preparation method thereof |
| CN113913048A (en) * | 2021-03-26 | 2022-01-11 | 杭州安誉科技有限公司 | High-thermal-conductivity PCR reaction tube and preparation process thereof |
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| CN113913048A (en) * | 2021-03-26 | 2022-01-11 | 杭州安誉科技有限公司 | High-thermal-conductivity PCR reaction tube and preparation process thereof |
| CN113735503A (en) * | 2021-08-26 | 2021-12-03 | 江阴市龙宇节能科技有限公司 | Polyphenyl-phase change composite thermal insulation material and preparation method thereof |
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