CN103771808A - Phase change thermal storage cement mortar containing rubber powder and preparation method thereof - Google Patents
Phase change thermal storage cement mortar containing rubber powder and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a phase change thermal storage cement mortar containing rubber powder. The formula of the cement mortar (by mass portion) is as below: 5-40 portions of a phase change energy storage material, 100 portions of cement, 120-280 portions of sand and 5-30 portions of water. The phase change energy storage material has a microcapsule structure, and is composed of a capsule wall and a capsule core; the capsule core uses an organic phase change material; and the capsule wall is a silica-rubber powder composite capsule wall material. The preparation method of the cement mortar is as below: (1) adding an oil phase material formed by mixing an organic phase change material and a surface active agent into an aqueous phase material containing silica, dispersing the mixture uniformly in an emulsion, then quickly adding a coupling agent and the rubber powder, filtering, washing and drying to obtain the phase change energy storage material; (2) mixing the cement, sand, additives and the phase change energy storage material into a dry material; and (3) adding water to the dry material. The phase change thermal storage cement mortar containing rubber powder provided by the invention has the advantages of phase change thermoregulation, long service life, excellent physical and chemical properties, environment-friendliness, no toxicity, and wide application range, etc.
Description
Technical field
The present invention relates to a kind of sand-cement slurry and preparation method thereof, relate in particular to a kind of phase-transition heat-storage sand-cement slurry that contains rubber powder and preparation method thereof.
Background technology
China is the country that the energy relatively lacks, and energy occupancy volume is only 40% of world standard per capita, but energy consumption total quantity consumed accounts for the second in the world, and the construction industry big power consumer in national economy especially.It is reported, in China's existing building, 95% does not reach energy conservation standard, energy-conservationly in newly-increased building up to standard does not exceed eighty per cant, and unit floor area of building energy consumption is 2～3 times of developed country, has caused heavy energy burden to society.In addition,, along with the develop rapidly of domestic automobile industry, the output of junked tire will be with annual double-digit speed increment.2004, the generation of China's junked tire exceeded 1.12 hundred million, up to the present still had a considerable amount of junked tires not deal with.These tires have not only caused huge threat to environment, and are a kind of serious wastings of resources.Therefore, the processing of junked tire also just becomes a serious social concern.Sand-cement slurry is conventional construction material, after junked tire is processed, is blended in sand-cement slurry, and part substitutes slurry component, is efficent use of resources, is again a new way that solves environmental problem.
In addition, want to improve the heat-accumulation temperature-adjustment ability of sand-cement slurry, the most effective way is that a certain amount of phase-changing energy storage material is added wherein.Phase-changing energy storage material (PCM) is as a kind of emerging functional materials, its principle of work is: utilize the phase transition process of material, absorb (or release) latent heat of phase change, realize the absorption (or release) to energy in environment, and then can heat accumulation or refrigeration, thereby realize the target of energy storage.Phase-change accumulation energy belongs to the one of hidden heat energy storage, have compared with sensible heat energy storage that energy storage density is high, the easily feature such as control of energy storage (or release can) the approximate isothermal of process, process, be very suitable for solving Power supply and demand unbalance and in space, on the time unmatched contradiction.If phase-changing energy storage material, rubber powder (from junked tire) and mortar can be combined with, will improve largely the use properties of sand-cement slurry, this mode being combined with is studied less at present.In addition,, because rubber powder belongs to organic substance, in the process of mixing with mortar (inorganic substance), its affinity also has much room for improvement.
At the end of the eighties in last century, the method that first the Shuaib Ahmad professor (concrete, 2009,8,63～65) of the U.S. utilizes rubber grain replacement thickness to gather materials is prepared modified rubber cement concrete.Modified rubber cement concrete has the not available distinct advantages of many portland cement concrete, such as lightweight, elastic shock attenuation, noise reduction sound insulation, air-and water-permeable, ductility and good toughness etc.
The people such as Zheng Lijuan (Wuhan University of Technology's journal, 2008,30:1,52～54) research shows, select polar monomer maleic anhydride (MAH), under non-oxygen barrier condition, take benzoyl peroxide (BPO) as initiator, graft modification is carried out in waste rubber powder surface, rubber powder, after surface modification, can obviously increase the interfacial adhesion of rubber powder and sand-cement slurry.But, when using this type of chemical modification method to improve rubber powder and sand-cement slurry avidity, easily introduce a small amount of chemical composition, easily covil construction are polluted.Further, the rubber powder of this class methods modification, the increase rate of itself and sand-cement slurry interfacial adhesion is limited, can not tackle the problem at its root.Moreover chemical modification process more complicated, easily cause mortar cost surging, be unfavorable for that spread uses.
The people such as Liu Chenglou (Chinese coating, 2010,25:12,39～43) prepared a kind of phase-change and energy-storage desulfurized gypsum thermal insulation mortar, this mortar is a kind of interior wall coating material of alternative brushing gypsum backing material, coating has the functions such as insulation, temperature adjustment, fine setting be wet, is a kind of environment-friendly and energy-efficient product innovation, is made up of composite cementitious materials, light-weight aggregate, phase-change accumulation energy shaping material and multiple admixture.Phase-change accumulation energy shaping material is wherein by octadecane wax liquid is adsorbed onto in the open pores of pearlstone, makes sizing phase-change material after cooling.Use phase-changing energy storage material that this type of physical adsorption method makes after circulation repeatedly, easily from matrix, run off, cause material heat storage capacity to decline; Also, because its preparation process need to experience vacuum suck twice, preparation process is more loaded down with trivial details, is difficult for grasping.
CN101671149A discloses a kind of paraffin microencapsulated phase-change thermal-storage mortar and preparation method thereof.The method, take inorganic gel materials such as cement as matrix, is mixed the organic phase change material paraffin of micro encapsulation, forms the novel external wall heat insulating material for external with heat accumulation function.Adopt coupling agent process for modifying surface and polymer fiber toughening technology, improved the consistency of paraffin microcapsule and inorganic gel materials.But microcapsule prepared by the method select urea and formaldehyde as cyst material, easily bring pollution in generative process and use procedure, especially for covil construction, also can produce some disadvantageous effects at aspects such as fire prevention.In addition, select to add coupling agent to improve the consistency of paraffin microcapsule and inorganic gel materials, only can have effect to a certain extent direct affine DeGrain.
Summary of the invention
In view of the deficiencies in the prior art, the invention provides a kind of phase-transition heat-storage sand-cement slurry that contains rubber powder and preparation method thereof.The phase-transition heat-storage sand-cement slurry that prepared by the inventive method contain rubber powder has phase-changing and temperature-regulating, life cycle is long, physicochemical property is good, environment-protecting asepsis, the advantage such as widely applicable.
The phase-transition heat-storage sand-cement slurry that the present invention contains rubber powder, its formula is as follows, in mass parts:
5～40 parts of phase-changing energy storage materials, are preferably 10～30 parts,
100 parts of cement,
120～280 parts of sands, are preferably 150～220 parts,
5～30 parts, water; Be preferably 10～20 parts,
In the present invention, phase-changing energy storage material is microcapsule structure, is made up of cyst wall and capsule-core, capsule-core adopts organic phase change material, cyst wall is silica-rubber powder composite sac wall material, and the mass ratio of capsule-core and cyst wall is 1:3～1:10, and the mass ratio of silicon-dioxide and rubber powder is 1:1～3:1.
In the present invention, organic phase change material is generally paraffin, C
14～C
22normal paraffin, C
9～C
18higher fatty acid and ester class in one or more, be preferably 18
#paraffin, 20
#paraffin, 25
#paraffin, 30
#paraffin, 45
#paraffin, 58
#one or more in paraffin or n-butyl stearate etc.The transformation temperature of organic phase change material is 18～60 ℃.
In the present invention, silicon-dioxide is generated by one or more silicon source material hydrolysis, as tetraethoxy and/or silicon sol, is preferably silicon sol.
In the present invention, rubber powder is the rubber powder that waste old machining obtains, and particle diameter is 60～120 orders.
In the present invention, cement is one or more in the silicate cement, ordinary Portland cement, high-alumina cement of strength grade 42.5 or 52.5.
In the present invention, sand is one or more in river sand, extra large sand, artificial sand, and fineness modulus is 1～3.
In the present invention, preferably add a kind of additive in phase-transition heat-storage sand-cement slurry, this additive is one or more in redispersable latex powder, calcium carbonate powders, ether of cellulose or fiber.Additive preferably includes redispersable latex powder, calcium carbonate powders, ether of cellulose and fiber, and add-on is 0.5～10 part, is preferably 1～5 part; Wherein redispersable latex powder add-on is 0.8～5 part, is preferably 1～3 part; Calcium carbonate powders add-on is 0.1～5 part, is preferably 0.4～2 part; Ether of cellulose add-on is 0.1～8 part, is preferably 0.5～3 part; Fiber add-on is 0.5～10 part, is preferably 1～5 part.
In the present invention, in additive, redispersable latex powder is one or more in the multipolymer of multipolymer, vinyl acetate between to for plastic and propylene of multipolymer, vinyl acetate between to for plastic and the ethene of vinyl acetate between to for plastic and tertiary monocarboxylic acid ethene, be preferably the multipolymer of vinyl acetate between to for plastic and ethene, its minimum film-forming temperature is zero degree; Calcium carbonate powders particle diameter is 1～10 μ m; Ether of cellulose is one or more in methylcellulose gum, hydroxyethylmethyl-cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, Natvosol, Vltra tears, is preferably methylcellulose gum and ethyl cellulose; Fiber is one or more in vegetable fibre in natural fiber, animal fibre, mineral fibre, is preferably vegetable fibre.
The phase-transition heat-storage sand-cement slurry preparation method that the present invention contains rubber powder, comprises the following steps: organic phase change material and tensio-active agent are mixed into oil phase material by (1); It is in the deionized water of 3～8 times of its quality that silicon source material is joined, and makes silica containing water material; Oil phase material is joined to dispersed one-tenth milk sap in water material, add rapidly subsequently coupling agent and rubber powder, after filtering, wash, being dried, obtain phase-changing energy storage material; (2) cement, sand, additive and phase-changing energy storage material are mixed into uniform siccative; (3) finally water is joined in siccative, obtain the phase-transition heat-storage sand-cement slurry that contains rubber powder.
In the inventive method, can add as required or not add additive, preferably add additive.
In the inventive method, the mass ratio of tensio-active agent and organic phase change material is 1:50～1:30; In the material of silicon source, dioxide-containing silica is 25wt%～65wt%; The mass ratio of coupling agent and organic phase change material is 1:1～1:5.
In the inventive method, tensio-active agent is one or more in polyoxyethylene glycol, sucrose ester, polysorbate, octadecyl Phenylsulfonic acid, sodium lauryl sulphate, Trombovar, Sodium palmityl sulfate etc., is preferably one or both in sodium lauryl sulphate and Trombovar.
In the inventive method, coupling agent is one or more in γ-aminopropyl triethoxysilane, γ mercaptopropyitrimethoxy silane, is preferably γ mercaptopropyitrimethoxy silane.
In the inventive method, organic phase change material and tensio-active agent are uniformly mixed into oil phase material under 30～80 ℃ of heating, 500～1000rpm agitation condition; Silicon source material is joined in deionized water, under room temperature, stir with 500～1000rpm, mix and make water material; Oil phase material is joined in water material, and heating at 30～80 ℃, stirs 20～100 minutes with 500～1500rpm; Add after coupling agent and rubber powder, under former temperature and mixing speed, keep 20～60 minutes, after filtering, wash, being dried, obtain phase-changing energy storage material.
The phase-transition heat-storage sand-cement slurry that prepared by the inventive method contain rubber powder is applicable to covil construction, commercial building ground and body of wall and lays, and the heat-accumulation temperature-adjustment in extraordinary house (as mobile communication room).
Advantage of the present invention, specific as follows:
(1) microcapsules of storing energy through phase change that prepared by the inventive method; rubber powder and silicon-dioxide are combined and become composite sac wall material by action of coupling agents; due to contain in cyst wall structure-OH group; easily with the hydrophilic inorganic material bonding such as cement and sand; so the microcapsule granule of preparation can be dispersed in body material more securely; be that rubber powder also can merge in body material preferably, be difficult for layering, or come off.
(2) the phase-transition heat-storage sand-cement slurry that contains rubber powder that prepared by the inventive method, because part of cement and sand are substituted by rubber powder, therefore this mortar has lower density; Toughness and the extension property of all right reinforced mortar of existence of rubber powder, improve shock resistance and anti-fatigue ability, improves acoustical and thermal effect.In addition, waste old is combined to use with traditional construction material, also contribute to resource reutilization, while or a kind of low cost are improved the effective way of sand-cement slurry, have certain economic benefit.
(3) microcapsules of storing energy through phase change that prepared by the inventive method is the composite sac wall construction that contains rubber powder, and its intensity and toughness are all better than the microcapsule using single-material as cyst wall, can obviously improve the life cycle of microcapsule.
(4) adopt and add the mode of additive to improve the performance of sand-cement slurry self, and regulate the fusion performance of microcapsules of storing energy through phase change and sand-cement slurry.Specifically, the finedraw that the calcium carbonate powders in additive can filling concrete, improves compaction rate, the physical strength of reinforced cement mortar; Redispersable latex powder can reinforced cement mortar cohesive strength, reduce its water-absorbent, prevent cracking, improve the snappiness of mortar simultaneously; Ether of cellulose has certain hydrophilic ability, can improve the fusion faculty of microcapsules of storing energy through phase change and sand-cement slurry; After fiber mixes with sand-cement slurry, can embed in mortar pore, effectively prevent the cracking of mortar.
(5) preparation technology of the present invention is simple, controllability is strong, utilizes existing industrial processes technology, and almost cost free increases, and has greatly improved production efficiency, is suitable for commercial scale production and promotes.
Accompanying drawing explanation
Fig. 1 is the performance test graphic representation of the sand-cement slurry of embodiment 1 and comparative example 1 gained.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.In the present invention, given umber is mass parts, and wt% is massfraction.
Embodiment 1
Getting latent heat of phase change is 25 of 157.7 kJ/kg
#20 parts and 0.5 part sodium lauryl sulphate of paraffin is put into beaker, is placed in magnetic force thermostatic mixer, is heated to 50 ℃, after paraffin melts completely, rotating speed is adjusted to 500rpm, is uniformly mixed to form oil phase material; 80 parts of silicon sol that is 35wt% by dioxide-containing silica join in 300 parts of deionized waters, under room temperature, stir with 1000rpm, obtain 60 parts of silicon-dioxide after hydrolysis, make water material; Oil phase material is joined in water material, at 50 ℃, stir 30 minutes with 800rpm, form milk sap; Add subsequently 60 parts of rubber powders, add 20 parts of γ mercaptopropyitrimethoxy silanes according to the mass ratio 1:1 of organic phase change material and coupling agent, former temperature continues to stir 20 minutes, obtains the microcapsules of storing energy through phase change A of the compound cyst wall of silica-rubber powder after filtering, wash, being dried.Recording this microcapsule potential heat value by differential scanning calorimeter (DSC) is 50.5 kJ/kg, and the diameter that scanning electron microscope (SEM) is measured is about 13 μ m.
By the cement of 100 parts, the sand, 5 parts of additives (wherein 5 parts, 3 parts of 3 parts of multipolymers, the methylcellulose gum of 2 parts of calcium carbonate powderss, vinyl acetate between to for plastic and ethene and vegetable fibre) of 220 parts and the microcapsules of storing energy through phase change A blend of 30 parts, stir again.Add subsequently 20 parts of water, stir, must contain the phase-transition heat-storage sand-cement slurry A of rubber powder
1.It is 31.6 kJ/kg that DSC records this mortar potential heat value.
Comparative example 1
In embodiment 1, do not add microcapsules of storing energy through phase change, rest materials and operational condition are constant, obtain sand-cement slurry A
2.It is 7.2 kJ/kg that DSC records mortar potential heat value.As shown in Figure 1, in two isopyknic Simulation house roof structures, load respectively the sand-cement slurry A of 5 kilograms
1with sand-cement slurry A
2, in the summer of Northern Part of China, high noon, temperature can exceed in the situation of 30 ℃, carried out heat-accumulation temperature-adjustment simultaneous test from 9 o'clock in the morning by afternoon 16 o'clock.Experimental result shows not add the ordinary mortar potential heat value of microcapsules of storing energy through phase change very low, and because the thermal-arrest effect on roof has even exceeded free air temperature, has a strong impact on the level of comfort of buildings; And the mortar that has added microcapsules of storing energy through phase change keeps below free air temperature in for a long time, and intensification and temperature-fall period milder, provide certain condition for improving human settlement.
Embodiment 2
At embodiment 1, prepare in the process of microcapsules of storing energy through phase change, rubber powder umber is kept to 40 parts by 60 parts, make microcapsules of storing energy through phase change B.The potential heat value that records B by DSC is 65.3kJ/kg, and the diameter that scanning electron microscope (SEM) is measured B is about 10 μ m.Rest materials and operational condition are constant, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
1.It is 37.5 kJ/kg that DSC records mortar potential heat value.
Embodiment 3
In embodiment 2, keep rest materials and operational condition constant, the umber of microcapsules of storing energy through phase change B is reduced to 10 parts, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
2.It is 25.1kJ/kg that DSC records mortar potential heat value.
Embodiment 4
In embodiment 2, keep rest materials and operational condition constant, the umber of additive is reduced to 1 part, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
3.It is 36.3kJ/kg that DSC records mortar potential heat value.
Embodiment 5
In embodiment 2, keep rest materials and operational condition constant, in additive, only comprise 0.5 part of copolymer 1 part of vinyl acetate between to for plastic and ethene and methylcellulose gum, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
4.It is 35.5 kJ/kg that DSC records mortar potential heat value.
Embodiment 6
In embodiment 2, keep rest materials and operational condition constant, in additive, only comprise the multipolymer of 5 parts of vinyl acetate between to for plastics and ethene, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
5.It is 35.1kJ/kg that DSC records mortar potential heat value.
Embodiment 7
In embodiment 2, keep rest materials and operational condition constant, do not add additive, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
6.It is 34.9kJ/kg that DSC records mortar potential heat value.
Embodiment 8
In embodiment 2, keep rest materials and operational condition constant, sand umber is reduced to 150 parts, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
7.It is 38.4kJ/kg that DSC records mortar potential heat value.
In embodiment 2, keep rest materials and operational condition constant, the umber of water is reduced to 10 parts, obtain the phase-transition heat-storage sand-cement slurry B that contains rubber powder
8.It is 36.5kJ/kg that DSC records mortar potential heat value.
Comparative example 2
In embodiment 2, prepare in microcapsules of storing energy through phase change process and do not add rubber powder, make silicon sol hydrolysis generate silicon-dioxide, the cyst material of microcapsule only has silicon-dioxide, and rest materials and operational condition are constant, make microcapsules of storing energy through phase change C.The potential heat value that DSC records C is 88.6kJ/kg, and the diameter that scanning electron microscope (SEM) is measured C is about 8.5 μ m.
Comparative example 3
According to the people such as Zheng Lijuan (Wuhan University of Technology's journal, 2008,30:1,52～54) research method, get 40 parts of rubber powders and be placed in 20mL toluene solution, add maleic anhydride BPO, isothermal reaction 5 hours at 80 ℃, dry wash away impurity after cooling, obtain rubber powder surface grafting maleic anhydride product.By saturated NaOH solution soaking 40 minutes for rubber powder, then clean rubber powder surface with clear water again, naturally dry, obtain the rubber powder of surface modification.
According to proportioning in embodiment 2, use waits umber microcapsules of storing energy through phase change C to replace B, and the modified rubber powder that obtains of the aforesaid method of the umber such as interpolation, and rest materials and operational condition are constant, obtain the phase-transition heat-storage sand-cement slurry C that contains rubber powder
1.
Comparative example 4
According to the people such as Liu Chenglou (Chinese coating, 2010,25:12,39～43) preparation method, adds pearlstone in heating in water bath for reaction still, is 80 ℃ in temperature, negative pressure of vacuum, under 0.5～0.6MPa, vacuumizes 20min, then adds the octadecane wax of melting, continue to vacuumize, negative pressure is 0.9～1.0MPa, and insulation 30min makes octadecane wax liquid be inflated perlitic open pores absorption completely, discharging, cooling, makes phase-changing energy storage material D.
According to proportioning in embodiment 2, use waits umber phase-changing energy storage material D to replace B, and the rubber powder of the umber such as interpolation, and rest materials and operational condition are constant, obtain the phase-transition heat-storage sand-cement slurry D that contains rubber powder
1.
Table 1 is depicted as the physicochemical property comparing result of the phase-changing energy storage material making in embodiment and comparative example.
Table 1 phase-changing energy storage material physicochemical property comparing result
| Physicochemical property | Potential heat value/kJkg -1 | Grain size/μ m | Compressive strength/KPa | Potential heat value/kJkg after 1 year -1 | Thermostability (later having or not leakage for 1 year) |
| A | 50.5 | 13 | 430 | 50.3 | Without leakage |
| B | 65.3 | 10 | 405 | 65.1 | Without leakage |
| C | 88.6 | 8.5 | 310 | 88.2 | Without leakage |
| D | 45.3 | 52 | 285 | 39.2 | There is leakage |
From table 1, in cyst wall structure, do not add in the situation of rubber powder, potential heat value is higher, grain size is less, but compressive strength is on the low side, is only 310KPa, increased with other material Blending Processes in damaged probability; And when in the higher situation of rubber powder add-on, although compressive strength is higher, its potential heat value is on the low side, grain size is also larger, exists certain not enough; Only, when rubber powder consumption is moderate, the overall target of the microcapsules of storing energy through phase change making is just more applicable.The phase-changing energy storage material that uses physisorphtion to obtain, compared with microcapsules of storing energy through phase change, the material accumulation of energy of unit mass is lower, and potential heat value is only 45.3kJkg
-1, and thermostability is poor, uses and has the phenomenon of leakage after 1 year.
Table 2 is depicted as the comparing result of the sand-cement slurry physicochemical property making in embodiment and comparative example.
Table 2 sand-cement slurry physicochemical property comparative result
| Physicochemical property | Potential heat value/kJkg -1 | Thermal conductivity W/ (mK) | Resistance to cleavage/Jmm 2×10 -5 | Ultimate compression strength/MPa | Recycle the performance of 5 years |
| A 1 | 31.6 | 0.20 | 15 | 21 | Without leakage |
| A 2 | 7.2 | 0.47 | 4 | 33 | — |
| B 1 | 37.5 | 0.22 | 13 | 25 | Without leakage |
| B 2 | 25.1 | 0.24 | 12 | 27 | Without leakage |
| B 3 | 36.3 | 0.24 | 11 | 25 | Without leakage |
| B 4 | 35.5 | 0.23 | 11 | 24 | Without leakage |
| B 5 | 35.1 | 0.24 | 11 | 23 | Without leakage |
| B 6 | 34.9 | 0.23 | 10 | 23 | Without leakage |
| B 7 | 38.4 | 0.23 | 12 | 24 | Without leakage |
| B 8 | 36.5 | 0.22 | 12 | 24 | Without leakage |
| C 1 | 58.1 | 0.35 | 9 | 28 | There is leakage |
| D 1 | 20.3 | 0.28 | 8 | 22 | There is leakage |
Note: the moulding of test specimen and preparation method are undertaken by GB175-1999, then measures ultimate compression strength and the resistance to cleavage of its 28d according to GB/T17671-1999 " Test method for strength of hydraulic cement mortar ".
As can be seen from Table 2, its potential heat value of sand-cement slurry that adds microcapsules of storing energy through phase change is higher, and ordinary mortar potential heat value only has 7.2kJ/kg(A
2shown in).Because the thermal conductivity of conventional cement mortar is higher, heat transfer and exothermic process are very fast, so heat insulation effect is poor; Add after the microcapsules of storing energy through phase change that contains rubber powder, thermal conductivity obviously reduces, and along with the mass penalty of rubber powder, thermal conductivity is on a declining curve, add the sand-cement slurry heat insulation and preservation effect of rubber powder better, the mortar heat-accumulation temperature-adjustment effect that prepared by the inventive method is better.Along with adding of microcapsules of storing energy through phase change, the ultimate compression strength of sand-cement slurry starts to reduce, but within the scope of certain interpolation, still remains on 25MPa left and right, meets GB/T17671-1999 requirement.And having added the mortar of rubber powder and combined additive, its resistance to cleavage increases, and increases along with the increase of rubber powder and combined additive add-on.
Rubber powder after modification is directly added in other material to all poor (C of the sand-cement slurry resistance to cleavage making and thermal conductivity
1shown in), main poor relevant with the affine effect of rubber powder and fertile material.Through the outdoor test discovery of 5 years, the sand-cement slurry that contains microcapsules of storing energy through phase change was without leakage phenomenon, and potential heat value changes very little.
Claims (17)
1. contain a phase-transition heat-storage sand-cement slurry for rubber powder, its formula following (in mass parts):
5～40 parts of phase-changing energy storage materials,
100 parts of cement,
120～280 parts of sands,
5～30 parts, water,
Wherein, phase-changing energy storage material is microcapsule structure, is made up of cyst wall and capsule-core, capsule-core adopts organic phase change material, cyst wall is silica-rubber powder composite sac wall material, and the mass ratio of capsule-core and cyst wall is 1:3～1:10, and the mass ratio of silicon-dioxide and rubber powder is 1:1～3:1.
2. according to sand-cement slurry claimed in claim 1, it is characterized in that: its formula following (in mass parts):
10～30 parts of phase-changing energy storage materials,
100 parts of cement,
150～220 parts of sands,
10～20 parts, water.
3. according to sand-cement slurry claimed in claim 1, it is characterized in that: organic phase change material is paraffin, C
14～C
22normal paraffin, C
9～C
18higher fatty acid and ester class in one or more.
4. according to sand-cement slurry claimed in claim 1, it is characterized in that: organic phase change material is 18
#paraffin, 20
#paraffin, 25
#paraffin, 30
#paraffin, 45
#paraffin, 58
#one or more in paraffin or n-butyl stearate etc.
5. according to the sand-cement slurry described in claim 1,3 or 4, it is characterized in that: the transformation temperature of organic phase change material is 18～60 ℃.
6. according to sand-cement slurry claimed in claim 1, it is characterized in that: silicon-dioxide is generated by one or more silicon source material hydrolysis, and silicon source material is tetraethoxy and/or silicon sol.
7. according to sand-cement slurry claimed in claim 1, it is characterized in that: rubber powder is the rubber powder that waste old machining obtains, particle diameter is 60～120 orders.
8. according to sand-cement slurry claimed in claim 1, it is characterized in that: cement is one or more in the silicate cement, ordinary Portland cement, high-alumina cement of strength grade 42.5 or 52.5.
9. according to sand-cement slurry claimed in claim 1, it is characterized in that: sand is one or more in river sand, extra large sand, artificial sand, and fineness modulus is 1～3.
10. according to sand-cement slurry claimed in claim 1, it is characterized in that: in sand-cement slurry, add a kind of additive, this additive is one or more in redispersable latex powder, calcium carbonate powders, ether of cellulose or fiber.
11. according to sand-cement slurry claimed in claim 10, it is characterized in that: the additive adding comprises redispersable latex powder, calcium carbonate powders, ether of cellulose and fiber, and add-on is 0.5～10 part; Wherein redispersable latex powder add-on is 0.8～5 part, and calcium carbonate powders add-on is 0.1～5 part, and ether of cellulose add-on is 0.1～8 part, and fiber add-on is 0.5～10 part.
12. according to sand-cement slurry claimed in claim 10, it is characterized in that: the additive adding comprises redispersable latex powder, calcium carbonate powders, ether of cellulose and fiber, and add-on is 1～5 part; Wherein redispersable latex powder add-on is 1～3 part, and calcium carbonate powders add-on is 0.4～2 part, and ether of cellulose add-on is 0.5～3 part, and fiber add-on is 1～5 part.
13. according to the sand-cement slurry described in claim 10,11 or 12, it is characterized in that: in additive, redispersable latex powder is one or more in the multipolymer of multipolymer, vinyl acetate between to for plastic and propylene of multipolymer, vinyl acetate between to for plastic and the ethene of vinyl acetate between to for plastic and tertiary monocarboxylic acid ethene, and its minimum film-forming temperature is zero degree; Calcium carbonate powders particle diameter is 1～10 μ m; Ether of cellulose is one or more in methylcellulose gum, hydroxyethylmethyl-cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, Natvosol, Vltra tears; Fiber is one or more in vegetable fibre in natural fiber, animal fibre, mineral fibre.
The arbitrary described phase-transition heat-storage sand-cement slurry preparation method who contains rubber powder of 14. claims 1 to 13, comprises the following steps: organic phase change material and tensio-active agent are mixed into oil phase material by (1); It is in the deionized water of 3～8 times of its quality that silicon source material is joined, and makes silica containing water material; Oil phase material is joined to dispersed one-tenth milk sap in water material, add rapidly subsequently coupling agent and rubber powder, after filtering, wash, being dried, obtain phase-changing energy storage material; (2) cement, sand, additive and phase-changing energy storage material are mixed into uniform siccative; (3) finally water is joined in siccative, obtain the phase-transition heat-storage sand-cement slurry that contains rubber powder.
15. according to the preparation method described in claim 14, it is characterized in that: the mass ratio of tensio-active agent and organic phase change material is 1:50～1:30; In the material of silicon source, dioxide-containing silica is 25wt%～65wt%; The mass ratio of coupling agent and organic phase change material is 1:1～1:5.
16. according to the preparation method described in claim 14, it is characterized in that: tensio-active agent is one or more in polyoxyethylene glycol, sucrose ester, polysorbate, octadecyl Phenylsulfonic acid, sodium lauryl sulphate, Trombovar, Sodium palmityl sulfate etc.
17. according to the preparation method described in claim 14, it is characterized in that: coupling agent is one or more in γ-aminopropyl triethoxysilane, γ mercaptopropyitrimethoxy silane.
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