CN109694208B - Powder curing agent for expanded perlite insulation board and preparation method thereof - Google Patents
Powder curing agent for expanded perlite insulation board and preparation method thereof Download PDFInfo
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- CN109694208B CN109694208B CN201710982052.7A CN201710982052A CN109694208B CN 109694208 B CN109694208 B CN 109694208B CN 201710982052 A CN201710982052 A CN 201710982052A CN 109694208 B CN109694208 B CN 109694208B
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a powder curing agent for an expanded perlite insulation board and a preparation method thereof, and the technical scheme is characterized by comprising the following raw materials in parts by weight: 50-60 parts of power generation chimney ash, 3-8 parts of industrial aluminum sulfate, 5-10 parts of active silica, 25-35 parts of cement clinker powder, 8-12 parts of fluorite powder and 0.5-1 part of retarder, wherein the power generation chimney ash, the industrial aluminum sulfate, the active silica, the cement clinker powder, the fluorite powder and the retarder are prepared into a powder curing agent to realize the reutilization of industrial and mineral waste materials, and the prepared powder curing agent has the quick-setting property of gypsum and the high strength of cement; the insulation board is low in alkalinity, and the phenomena of alkali return and peeling of the insulation board are obviously reduced; the device also has the function of eliminating radioactive substances and can flexibly control the forming time in the forming process.
Description
Technical Field
The invention relates to a building material, in particular to a powder curing agent for an expanded perlite heat-insulating board and a preparation method thereof.
Background
Building energy conservation is an industry which is mainly supported by national industrial policies. At present, building energy-saving materials are mainly divided into inorganic heat-insulating lightweight aggregate and organic heat-insulating lightweight aggregate, but due to the characteristics of chemical properties of the materials, the requirements of heat-insulating energy-saving performance and fire safety cannot be met at the same time no matter an inorganic system or an organic system. From the aspect of heat preservation performance, the organic material is superior to the inorganic material; from the aspect of fire safety performance, the inorganic heat-insulating material is better. In recent years, expanded perlite in inorganic heat-insulating materials is gradually becoming the first choice of inorganic external wall heat-insulating materials due to the advantages of excellent fireproof performance, no environmental pollution and the like.
At present, Chinese patent with application publication number CN105948638A in the existing patent discloses a hydrophobic modified expanded perlite insulation board and a production method thereof, wherein the insulation board comprises 25-40 parts of cement, 5-8 parts of fly ash, 2-5 parts of triethoxysilane, 5-10 parts of polyacrylate emulsion, 50-70 parts of modified expanded perlite, 0.7-2.9 parts of sodium dodecyl benzene sulfonate, 5-10 parts of additive, 1-3 parts of quicklime, 0.1-0.5 part of PP fiber, 0.5-2 parts of carbon fiber, 5-10 parts of diatomite, 4-10 parts of sodium silicate and 10-20 parts of water.
However, in the preparation process of the insulation board, fly ash, quicklime, diatomite and sodium silicate are used as powder curing agents to be added into a cement and expanded perlite system, so that a forming system of the insulation board is strong alkaline, and white flower substances are presented on the surface of a wall body through wind blowing, sun drying and rain showering in the using process, and serious alkali return and peeling phenomena are caused.
Disclosure of Invention
The invention aims to provide a powder curing agent for an expanded perlite heat-insulating board, which is used as an additive of an external wall heat-insulating material, overcomes the defect that the powder curing agent in the prior art is strong in basicity and easy to return to basicity, and has excellent alkali resistance.
The technical purpose of the invention is realized by the following technical scheme:
a powder curing agent for an expanded perlite insulation board comprises the following raw materials in parts by weight: 50-60 parts of power generation chimney ash, 3-8 parts of industrial aluminum sulfate, 5-10 parts of active silica, 25-35 parts of cement clinker powder, 8-12 parts of fluorite powder and 0.5-1 part of retarder.
By adopting the technical scheme, the chimney ash is obtained by burning steel lightweight aggregate through an intermediate frequency furnace, is also called as calcium silicate sulfate floating beads, has good activity, is used as a high-quality cement raw material and added into cement clinker in large quantity, can improve the early strength of cement, reduce the cost of cement and achieve the aim of changing waste into valuable;
industrial aluminum sulfate is white crystal, is easy to absorb moisture and agglomerate after being stored in the air for a long time, is easy to dissolve in water, and is difficult to dissolve in alcohol when the water solution is acidic; mainly used as a papermaking sizing agent and a flocculating agent for drinking water, industrial water and wastewater treatment, and also used as a raw material for producing artificial gems and other aluminum salts, such as ammonia alum, potassium alum and refined aluminum sulfate; in addition, aluminum sulfate is also widely used for high-quality clarifying agents, petroleum deodorizing and decoloring agents, concrete waterproofing agents, high-grade paper white forging, titanium dioxide post-film treatment and catalyst carrier production, and the invention is beneficial to enhancing the quick-setting effect of the powder curing agent;
the active silica is one of extremely important superfine inorganic new materials, because the particle size is very small, the surface area is larger, the surface adsorption force is strong, the surface energy is large, the chemical purity is high, the dispersion performance is good, the thermal resistance, the electric resistance and the like have specific performance, and the active silica has unique characteristics in various subjects and fields with excellent stability, reinforcement, thickening and thixotropy, has irreplaceable effect, and is widely applied to various industries as an additive, a catalyst carrier, petrochemical industry, a decolorant, a delustering agent, a rubber reinforcement agent, a plastic filling agent, an ink thickening agent, a metal soft polishing agent, an insulating and heat-insulating filling agent, an advanced daily cosmetic filling agent, a spraying material, medicine, environmental protection and other fields;
the cement clinker powder mainly comprises four oxides of calcium oxide, silicon oxide, aluminum oxide and ferric oxide, and also contains a small amount of magnesium oxide, sulfur trioxide, titanium oxide, phosphorus oxide, alkali and other silicate cement clinker produced in modern production, and is used as an additive to prepare a powder curing agent, so that the high strength of the powder curing agent is greatly improved, the cost can be reduced, and the energy consumption is saved;
the fluorite powder is limestone containing a certain amount of CaF2Accelerating the decomposition of limestone, the solid-phase reaction process and C3Formation of S, CaF2During the process of calcining the hydrated lime, the content of fCaO can be reduced, and the strength and the yield of the hydrated lime can be improved; the fluorite powder also has the function of quick setting; in addition, the fluorite powder has the function of eliminating radioactive materials, effectively absorbs radioactive substances in the air, and has excellent safety and environmental protection performance;
the power generation chimney ash, industrial aluminum sulfate, active silicon dioxide, cement clinker powder, fluorite powder and retarder are prepared into powder curing agent, so that industrial and mining waste materials are recycled, and the prepared powder curing agent has quick-setting property of gypsum and high strength of cement; the insulation board is low in alkalinity, and the phenomena of alkali return and peeling of the insulation board are obviously reduced; the device also has the function of eliminating radioactive substances and can flexibly control the forming time in the forming process.
The invention is further configured to: the particle size of the power generation chimney ash is 2000-3000 meshes.
By adopting the technical scheme, the particle size of the power generation flue dust is ground to 2000-3000 meshes, and if the particle size is smaller than 2000 meshes, the particles of the power generation flue dust are large, so that the power generation flue dust is not beneficial to being uniformly mixed with industrial aluminum sulfate, active silica, cement clinker powder, fluorspar powder and retarder; if the particle size is larger than 3000 meshes, the particles of the power generation flue dust are finer, and the finer power generation flue dust is filled in the powder curing agent, so that the cost of the powder curing agent is greatly increased.
The invention is further configured to: the specific surface area of the active silicon dioxide is 120-130 m2/g。
By adopting the technical scheme, the specific surface area of the active silicon dioxide is limited to 120-130 m2The activity of the silicon dioxide is enhanced, the silicon dioxide is favorably and closely attached to the surfaces of other fillers, and the quick-setting property of the powder curing agent is improved; meanwhile, the active silicon dioxide is also helpful for enhancing the structural strength of the powder curing agent.
The invention is further configured to: the particle size of the cement clinker powder is 800-1000 meshes.
By adopting the technical scheme, the cement clinker powder is mixed with other fillers and then is pressed to form the expanded perlite insulation board, the finer the particle size of the added cement clinker powder is, the compactness and the structural strength of the insulation board are favorably improved, the cement clinker powder is ground to the particle size of 800-1000 meshes, the moderate particle size of the cement clinker powder in the range is favorable for improving the uniform compactness of the prepared powder curing agent.
The invention is further configured to: CaF in the fluorspar powder2The content of (B) is more than 95 parts.
By adopting the technical scheme, the main component of the fluorspar powder is CaF2In the prior art, the fluorite powder generally contains more impurities, and CaF in the fluorite powder used in the invention2The content of the fluorite powder is more than 95 parts, the impurity content is less, and the quick setting effect of the fluorite powder is favorably improved; meanwhile, the method has a remarkable effect of eliminating radioactive substances in the air.
The invention is further configured to: the retarder comprises at least one of sodium dipolyphosphate, sodium tripolyphosphate and sodium hexametaphosphate.
By adopting the technical scheme, the sodium tripolyphosphate is white powder, is chain condensed phosphate, can be dissolved in water, has two kinds of common anhydrous substances and hexahydrate, has suspension dispersion, peptization and emulsification effects on oil and fat, and has a strong buffering effect within the pH value of 4.3-14; the sodium hexametaphosphate is one of sodium metaphosphate polymers, is colorless transparent flaky glass or white granular crystal, is soluble in water and insoluble in organic solvent, has high solubility in water but slow dissolution speed, and has the capability of generating soluble complex for metal ions such as calcium, magnesium and the like; sodium dipolyphosphate, sodium tripolyphosphate and sodium hexametaphosphate all belong to inorganic salt retarders, and any one of the three retarders reacts with calcium hydroxide to generate insoluble calcium phosphate which is used as the retarder to hinder the hydration.
The invention also aims to disclose a preparation method of the powder curing agent for the expanded perlite heat-insulation board, which comprises the following steps:
(1) preparing materials: weighing 50-60 parts of power generation chimney ash, 3-8 parts of industrial aluminum sulfate, 5-10 parts of active silica, 25-35 parts of cement clinker powder, 8-12 parts of fluorite powder and 0.5-1 part of retarder;
(2) drying: drying the power generation chimney ash at the high temperature of 550-650 ℃ for 1-1.5 h;
(3) and (3) calcining: calcining the fluorspar powder in a tubular heating furnace at a low temperature of 150-180 ℃ for 2-2.5 hours;
(4) mixing materials: and (3) putting the dried power generation chimney ash into a mixing stirrer, and sequentially adding industrial aluminum sulfate, active silicon dioxide, cement clinker powder, fluorite powder and retarder, and mixing and stirring for 20-40 min.
By adopting the technical scheme, the materials are firstly mixed; after the materials are mixed, the power generation chimney ash is dried at high temperature, so that the power generation chimney ash is ensured to have higher dryness; calcining the fluorspar powder at low temperature to ensure that the fluorspar powder has higher activity; then, adding each filler into a mixing stirrer for fully stirring, thereby preparing the uniformly mixed powder curing agent.
The invention is further configured to: in the material mixing process, stirring is carried out for 10-20 min at the rotating speed of 200-220 r/min, the rotating speed is increased to 380-400 r/min, and stirring is continued for 10-20 min.
By adopting the technical scheme, the mixing process is divided into two stages, namely a low-speed rotation stage and a high-speed rotation stage, and the mixing is stirred in the two stages, so that the mixing uniformity of the powder curing agent is remarkably improved.
In conclusion, the invention has the following beneficial effects:
1. the powder curing agent adopts the power generation chimney ash as the main raw material, fully utilizes industrial and mining waste materials, and is favorable for realizing the reutilization of wastes;
2. the powder curing agent prepared by the invention has quick setting property of gypsum, is quickly cured in the using process, and reduces the curing time in the construction process;
3. the powder curing agent prepared by the invention has the high strength of cement, and is added into the insulation board, so that the structural strength of the insulation board is improved;
4. in the prior art, most insulation boards have an alkali return phenomenon in the use process, and the powder curing agent disclosed by the invention is low in alkalinity and cannot have the alkali return phenomenon in the use process;
5. the powder curing agent has the air hardness of calcium hydroxide, is favorable for coagulation and hardening in the air, and keeps higher strength;
6. the powder curing agent also has the function of eliminating radioactive substances, and can be molded within a controllable time range.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
a preparation method of a powder curing agent for an expanded perlite insulation board comprises the following steps:
(1) preparing materials: weighing 500g of power generation chimney ash, 30g of industrial aluminum sulfate, 50g of active silica, 250g of cement clinker powder, 80g of fluorite powder and 5g of retarder;
(2) drying: drying 500g of power generation chimney ash at the high temperature of 600 ℃ for 1 h;
(3) and (3) calcining: calcining 80g of fluorspar powder in a tubular heating furnace at a low temperature of 150 ℃ for 2 hours;
(4) mixing materials: and (3) putting 500g of dried power generation chimney ash into a mixing stirrer, sequentially adding 30g of industrial aluminum sulfate, 50g of active silica, 250g of cement clinker powder, 80g of fluorite powder and 5g of retarder, mixing and stirring for 30min, and discharging.
Selecting a Chinese patent with application publication number CN105948638A, removing fly ash, quicklime, diatomite and sodium silicate which are used as powder curing agents in the formula, and adding the powder curing agent in the first embodiment to prepare the heat-insulating plate.
Example two:
a preparation method of a powder curing agent for an expanded perlite insulation board comprises the following steps:
(1) preparing materials: weighing 530g of power generation chimney ash, 30g of industrial aluminum sulfate, 60g of active silica, 275g of cement clinker powder, 90g of fluorite powder and 6g of retarder;
(2) drying: drying 530g of power generation chimney ash at the high temperature of 600 ℃ for 1 h;
(3) and (3) calcining: calcining 90g of fluorspar powder in a tubular heating furnace at low temperature of 150 ℃ for 2 hours;
(4) mixing materials: and (3) putting 530g of dried power generation chimney ash into a mixing stirrer, sequentially adding 30g of industrial aluminum sulfate, 60g of active silica, 275g of cement clinker powder, 90g of fluorite powder and 6g of retarder, mixing and stirring for 30min, and discharging.
Selecting a Chinese patent with application publication number CN105948638A, removing fly ash, quicklime, diatomite and sodium silicate which are used as powder curing agents in the formula, and adding the powder curing agent in the second embodiment to prepare the heat-insulating plate.
Example three:
a preparation method of a powder curing agent for an expanded perlite insulation board comprises the following steps:
(1) preparing materials: weighing 550g of power generation chimney ash, 60g of industrial aluminum sulfate, 60g of active silica, 300g of cement clinker powder, 100g of fluorite powder and 6g of retarder;
(2) drying: drying 550g of power generation chimney ash at the high temperature of 600 ℃ for 1 h;
(3) and (3) calcining: calcining 100g of fluorspar powder in a tubular heating furnace at a low temperature of 150 ℃ for 2 hours;
(4) mixing materials: and (3) putting 550g of dried power generation chimney ash into a mixing stirrer, sequentially adding 60g of industrial aluminum sulfate, 60g of active silica, 300g of cement clinker powder, 100g of fluorite powder and 6g of retarder, mixing and stirring for 30min, and discharging.
Selecting a Chinese patent with application publication number CN105948638A, removing fly ash, quicklime, diatomite and sodium silicate which are used as powder curing agents in the formula, and adding the powder curing agent in the third embodiment to prepare the heat-insulating plate.
Example four:
a preparation method of a powder curing agent for an expanded perlite insulation board comprises the following steps:
(1) preparing materials: 580g of power generation chimney ash, 60g of industrial aluminum sulfate, 80g of active silica, 300g of cement clinker powder, 110g of fluorspar powder and 8g of retarder are weighed;
(2) drying: drying 580g of power generation chimney ash at the high temperature of 600 ℃ for 1 h;
(3) and (3) calcining: calcining 110g of fluorspar powder in a tubular heating furnace at a low temperature of 150 ℃ for 2 hours;
(4) mixing materials: and (3) putting 580g of dried power generation chimney ash into a mixing stirrer, sequentially adding 60g of industrial aluminum sulfate, 80g of active silica, 300g of cement clinker powder, 110g of fluorite powder and 8g of retarder, mixing and stirring for 30min, and discharging.
Selecting a Chinese patent with application publication number CN105948638A, removing fly ash, quicklime, diatomite and sodium silicate which are used as powder curing agents in the formula, and adding the powder curing agent in the fourth embodiment to prepare the heat-insulating plate.
Example five:
a preparation method of a powder curing agent for an expanded perlite insulation board comprises the following steps:
(1) preparing materials: weighing 600g of power generation chimney ash, 80g of industrial aluminum sulfate, 90g of active silica, 300g of cement clinker powder, 120g of fluorspar powder and 10g of retarder;
(2) drying: drying 600g of power generation chimney ash at the high temperature of 600 ℃ for 1 h;
(3) and (3) calcining: calcining 120g of fluorspar powder in a tubular heating furnace at a low temperature of 150 ℃ for 2 hours;
(4) mixing materials: and (3) putting 600g of dried power generation chimney ash into a mixing stirrer, sequentially adding 80g of industrial aluminum sulfate, 90g of active silica, 300g of cement clinker powder, 120g of fluorite powder and 10g of retarder, mixing and stirring for 30min, and discharging.
Selecting a Chinese patent with application publication number CN105948638A, removing fly ash, quicklime, diatomite and sodium silicate which are used as powder curing agents in a formula, and adding the powder curing agent to prepare a heat-insulating plate as a sample to be detected.
Comparative example: as a comparative example, a Chinese patent having application publication No. CN105948638A was used.
The detection means is as follows:
the expanded perlite heat-insulation board prepared by each embodiment and the comparative example is sent to a building material quality detection center of Jiangsu province for detection;
1. the results of the appearance quality measurements are shown in the following table: (for two indexes of crack, missing edge and corner)
According to the surface treatment method, the surface of the insulation board prepared in the embodiment has no phenomena of edge deletion and corner falling, the surface firmness is excellent, the surface of the insulation board prepared in the comparative example has lower surface strength due to edge deletion and corner falling, and the phenomenon of alkali return easily occurs in the use process, so that the insulation board is damaged and peeled off.
2. Dry density (kg/m)3) The results of the measurements are shown in the following table:
as can be seen from the above table, after the insulation boards of the embodiment and the comparative example are subjected to dry density detection, the detection results of the embodiment are obviously superior to those of the comparative example within the qualified range of the standard requirements, and the dry density of the fourth embodiment is greater than that of the first embodiment and that of the third embodiment, which indicates that the weight of the insulation material contained in the unit volume of the insulation board is greater, and the insulation board is favorably promoted to have excellent insulation performance.
3. The results of the thermal conductivity measurements are shown in the following table: unit W/(m.K)
According to the above table, after the thermal conductivity is detected, the thermal conductivity of the insulation board prepared in the embodiment is within the qualified range of the standard requirement, the thermal conductivity of the embodiment is about 0.030W/(m.K), which is far smaller than that of the comparative example, and the smaller the thermal conductivity is, the heat conduction is not facilitated, so that the insulation board with excellent thermal insulation performance is prepared.
4. The results of the tensile strength (MPa) measurements are shown in the following table:
the table shows that the tensile strength of the insulation board prepared in the embodiment is within the range of standard requirements, the tensile strength of the embodiment is obviously superior to that of the comparative example, and the insulation board with excellent tensile strength is prepared.
5. The results of the volume water content (%) measurement are shown in the following table:
according to the table, the volume water content of the insulation board prepared in the embodiment is within the standard range, and the volume water content of the insulation board prepared in the embodiment is obviously smaller than that of the comparative example, so that the waterproof performance of the insulation board prepared in the embodiment is more excellent.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A powder curing agent for an expanded perlite insulation board is characterized by comprising the following raw materials in parts by weight: 50-60 parts of power generation chimney ash, 3-8 parts of industrial aluminum sulfate, 5-10 parts of active silica, 25-35 parts of cement clinker powder, 8-12 parts of fluorite powder and 0.5-1 part of retarder; the retarder comprises at least one of sodium dipolyphosphate, sodium tripolyphosphate and sodium hexametaphosphate.
2. The powder curing agent for the expanded perlite insulation board as recited in claim 1, wherein: the particle size of the power generation chimney ash is 2000-3000 meshes.
3. The powder curing agent for the expanded perlite insulation board as recited in claim 1, wherein: the specific surface area of the active silicon dioxide is 120-130 m2/g。
4. The powder curing agent for the expanded perlite insulation board as recited in claim 1, wherein: the particle size of the cement clinker powder is 800-1000 meshes.
5. The powder curing agent for the expanded perlite insulation board as recited in claim 1, wherein: CaF in the fluorspar powder2The content of (A) is more than 95%.
6. A preparation method of the powder curing agent for the expanded perlite insulation board as claimed in any one of claims 1 to 5 is characterized by comprising the following steps:
(1) preparing materials: weighing 50-60 parts of power generation chimney ash, 3-8 parts of industrial aluminum sulfate, 5-10 parts of active silica, 25-35 parts of cement clinker powder, 8-12 parts of fluorite powder and 0.5-1 part of retarder;
(2) drying: drying the power generation chimney ash at the high temperature of 550-650 ℃ for 1-1.5 h;
(3) and (3) calcining: calcining the fluorspar powder in a tubular heating furnace at a low temperature of 150-180 ℃ for 2-2.5 hours;
(4) mixing materials: and (3) putting the dried power generation chimney ash into a mixing stirrer, and sequentially adding industrial aluminum sulfate, active silicon dioxide, cement clinker powder, fluorite powder and retarder, and mixing and stirring for 20-40 min.
7. The preparation method of the powder curing agent for the expanded perlite insulation board according to claim 6, which is characterized in that: in the material mixing process, stirring is carried out for 10-20 min at the rotating speed of 200-220 r/min, the rotating speed is increased to 380-400 r/min, and stirring is continued for 10-20 min.
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