CN103030418A - Low-density composite foaming cement and preparation method thereof - Google Patents
Low-density composite foaming cement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses low-density composite foaming cement and a preparation method thereof, relating to a light building material. The foaming cement is prepared by adopting a normal-temperature foaming technology, and comprises the following components in parts by weight: 100 parts of cement, 10-50 parts of active admixture, 1-5 parts of redispersible emulsion powder, 1-4 parts of water repellent, 0.5-1.5 parts of cellulose ether, 0.3-0.7 parts of reinforced fiber, 0.2-0.5 parts of foam stabilizer, 3-8 parts of foaming agent and 50-80 parts of water. The method comprises the following preparation steps of: proportionally mixing and stirring the cement, active admixture, redispersible emulsion powder, water repellent, cellulose ether, reinforced fiber, foam stabilizer, and water into cement slurry; adding the foaming agent; and stirring, molding by casting and naturally curing. The foaming cement disclosed by the invention has the advantages of low volume weight, small heat conducting coefficient, small shrinkage ratio, high intensity, integration of heat preservation, sound insulation, fire prevention and low carbon, simple and convenient production preparation process and easiness in controlling.
Description
Technical field
The present invention relates to a kind of low density composite foaming cement with insulation, sound-proofing properties, belong to material of construction.
Background technology
At present, the used lagging material overwhelming majority of the external thermal insulation system in China's building energy conservation system is the inflammable organic polymer materials such as extruded sheet, fire; In recent years, owing to adopting the organic polymer lagging material to cause a lot of wildfires, cause heavy losses, caused the great attention of relevant departments, on March 14th, 2011, explicitly point out in " about the notice of further clear and definite covil construction heat insulating material for external fire supervision management relevant requirements " that the Fire-Fighting Bureau under the Ministry of Public Security issues: " before the new standard issue; carry out as strict as possible " covil construction outer heat preservation system and decoration of exterior wall fire prevention temporary provisions " second regulation, it is the material of A level that the covil construction heat insulating material for external adopts combustionproperty." this has proposed Secretary to energy-saving heat-insulating wall material, energy-saving heat-insulating wall material not only will satisfy the requirement of energy saving building, also will satisfy the fp requirement.Therefore, inorganic heat insulation material replaces organic polymer material, has become development trend.Inorganic heat insulation material commonly used has foamed cement, multicellular glass, foamed ceramics, gas concrete and the fiber heat preservation materials such as rock wool, mineral wool.Multicellular glass, foamed ceramics need high temperature sintering, and gas concrete needs steam press maintenance, and this three's production process energy consumption is large, and it is on the high side; Although the fiber heat preservation material such as rock wool, mineral wool price is lower slightly, harmful in producing, using.Relatively comprehensive, the energy consumption of foam cement preparation process is low, and contains a large amount of sealed porositys, has good insulation, sound insulation, fire resistance, is a kind of comparatively ideal lagging material, is rapidly developed in recent years and uses.
Patent CN102060566A discloses a kind of high-performance foaming cement and preparation method thereof, at first prepare cement slurry, then by the standby foam of foaming mechanism, again with cement slurry and foam by weight 1: (0.1-1) casting after the mixing and stirring makes foam cement.The problems such as the method exists that preparation process is complicated, cement slurry and foam ratio are wayward.Patent CN101113105A discloses a kind of foamed cement and its production and use, and its component comprises whipping agent, flyash and cement, and this patent does not relate to the concrete material of whipping agent and kind and foam cement preparation method thereof.
Summary of the invention
The object of the present invention is to provide a kind of foaming at normal temp technology to prepare the method for foam cement, the method manufacture process is easy, is easy to control; The excellent propertys such as prepared foam cement unit weight is low, thermal conductivity is little, intensity is high, soundproof effect, bonding have the effects such as insulation, fire prevention and noise reduction.
For achieving the above object, technical solution of the present invention adopts following weight part proportioning:
100 parts of cement, active admixture 10-50 part, redispersable latex powder 1-5 part, hydrophober 1-4 part, ether of cellulose 0.5-1.5 part, fortifying fibre 0.3-0.7 part, suds-stabilizing agent 0.2-0.5 part, whipping agent 3-8 part, water 50-80 part.
Described cement is one or two or more kinds mixing of silicate cement, sulplo-aluminate and high-alumina cement, and active admixture is one or more mixing in silicon ash, flyash, the slag powders; Hydrophober is one or more mixing of organosilicon moisture repellent, silylation hydrophober, fatty acid metal salt hydrophober such as calcium stearate, aluminum stearate; Ether of cellulose is one or more mixing of methyl cellulose ether, hydroxypropyl methyl cellulose ether, methyl hydroxyethylcellulose ether; Whipping agent is a kind of of hydrogen peroxide, aluminium powder, sodium bicarbonate; Fortifying fibre is one or two or more kinds mixing of polypropylene fibre, carbon fiber and vinylon fibre.Suds-stabilizing agent is one or more mixing of Sodium dodecylbenzene sulfonate, ACRYLIC EMULSION, trolamine, cocoanut fatty acid diethanolamide, glycollic amide.
In said ratio, when independent silicate cement, need to add hardening accelerator 1-3 part; Described hardening accelerator is one or more mixing of sodium sulfate, sodium aluminate, nitrocalcite, Quilonum Retard or calcium formiate.
Preparation method of the present invention and processing step are as follows:
(1) presses each component materials of proportion speed weighing;
(2) cement, active admixture, redispersable latex powder, hydrophober, ether of cellulose, fortifying fibre, suds-stabilizing agent and water are added in the stirrer successively, stirred 2-8 minute, become cement slurry;
(3) in the cement slurry that step (2) makes, add whipping agent by proportioning, stir 10-60 after second, casting, the physical environment maintenance gets final product.
Advantage of the present invention: low-density foamed cement of the present invention is a kind of fire prevention, energy-conservation porous, inorganic thermal insulation material.(1) volume density is low, thermal conductivity is little, intensity is high; (2) have good resistivity against fire, refractoriness reaches more than 1000 ℃, belongs to A level fire-retardant material; (3) the industrial solid castoff utilization ratio is high, and inorganic fire-retarded warming plate has utilized the solid waste such as flyash, blast-furnace slag in a large number, has saved resource, has protected environment.(4) meet the requirement that energy saving building is heat insulation, be incubated; Can be used for the insulations such as buildings external and internal wall, ground, roofing, also can be used as the lagging materials such as pipeline, boiler.The use that the present invention is a large amount of industrial residue, both protected environment, saved again resource, and reduced cost, meet the strategy of energy-saving and emission-reduction and Sustainable development.
Embodiment
Below in each example, raw materials used silicate cement is 42.5 grades of ordinary Portland cements of PO; Aluminosulfate cement is the R.SAC42.5 quick hardening sulphoaluminate cement; Aluminate cement is the CA-50 aluminate cement; The activity index of blast-furnace slag is measured by standard GB/T/T18046-2000, and 7 days activity indexs are not less than 75%, 28 day activity index and are not less than 95%; Flyash meets GB/T 1596-2005 regulation II level ash.
Embodiment 1
A kind of low density composite foaming cement is by weight ratio: 100 parts of aluminosulfate cements, 15 parts in flyash, 1.5 parts of redispersable latex powders, 2 parts of calcium stearates, 1 part of organosilicon moisture repellent, 0.5 part of methyl cellulose ether, 0.5 part of polypropylene fibre, 0.2 part of cocoanut fatty acid diethanolamide, 6 parts in hydrogen peroxide, 65 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing hydrogen peroxide) is added in the stirrer successively, stir after 5 minutes, add hydrogen peroxide and stirred casting natural curing 30 seconds.
After tested, made low density composite foaming cement dry density is 230kg/m
3, thermal conductivity is 0.055W/ (mK), and ultimate compression strength is 0.41MPa, and water-intake rate is 7.2%, and drying shrinkage is 0.64mm/m.
Embodiment 2
A kind of low density composite foaming cement is by weight ratio: 90 parts of aluminosulfate cements, 10 parts of silicate cements, 15 parts in flyash, 1.5 parts of redispersable latex powders, 2.3 parts of calcium stearates, 1 part of organosilicon moisture repellent, 0.5 part of methyl cellulose ether, 0.5 part of polypropylene fibre, 0.2 part of ACRYLIC EMULSION, 5.6 parts in hydrogen peroxide, 70 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing hydrogen peroxide) is added in the stirrer successively, stir after 5 minutes, add hydrogen peroxide and stirred casting natural curing 30 seconds.
After tested, made low density composite foaming cement dry density is 240kg/m
3, thermal conductivity is 0.061W/ (mK), and ultimate compression strength is 0.45MPa, and water-intake rate is 7.5%, and drying shrinkage is 0.65mm/m.
Embodiment 3
A kind of low density composite foaming cement is by weight ratio: 100 parts of silicate cements, 20 parts in flyash, 1.3 parts of redispersable latex powders, 1.5 parts of aluminum stearates, 1 part of organosilicon moisture repellent, 0.5 part of methyl cellulose ether, 0.5 part of polypropylene fibre, 0.2 part of trolamine, 1 part in sodium sulfate, 2 parts of sodium aluminates, 5.8 parts in hydrogen peroxide, 80 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing hydrogen peroxide) is added in the stirrer successively, stir after 5 minutes, add hydrogen peroxide and stirred casting natural curing 30 seconds.
After tested, made low density composite foaming cement dry density is 252kg/m
3, thermal conductivity is 0.068W/ (mK), and ultimate compression strength is 0.50MPa, and water-intake rate is 7.6%, and drying shrinkage is 0.76mm/m.
Embodiment 4
A kind of low density composite foaming cement is by weight ratio: 80 parts of silicate cements, 20 parts of aluminate cements, 20 parts of ground granulated blast furnace slags, 1.3 parts of redispersable latex powders, 2 parts of calcium stearates, 1 part of silylation hydrophober, 0.5 part of hydroxypropyl methyl cellulose ether, 0.35 part of polypropylene fibre, 0.1 part on carbon fiber, 0.2 part of trolamine, 2.6 parts of aluminium powders, 70 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing aluminium powder) is added in the stirrer successively, stir after 6 minutes, add aluminium powder and stirred casting natural curing 30 seconds.
After tested, made low density composite foaming cement dry density is 260kg/m
3, thermal conductivity is 0.067W/ (mK), and ultimate compression strength is 0.52MPa, and water-intake rate is 7.6%, and drying shrinkage is 0.68mm/m.
Embodiment 5
A kind of low density composite foaming cement is by weight ratio: 80 parts of silicate cements, 20 parts of aluminate cements, flyash 10,20 parts of ground granulated blast furnace slags, 1.3 parts of redispersable latex powders, 2 parts of calcium stearates, 1 part of silylation hydrophober, 0.5 part of hydroxypropyl methyl cellulose ether, 0.3 part of polypropylene fibre, 0.1 part on carbon fiber, 0.2 part of trolamine, 5.8 parts in hydrogen peroxide, 65 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing hydrogen peroxide) is added in the stirrer successively, stir after 5 minutes, add hydrogen peroxide and stirred casting natural curing 20 seconds.
After tested, made low density composite foaming cement dry density is 275kg/m
3, thermal conductivity is 0.079W/ (mK), and ultimate compression strength is 0.55MPa, and water-intake rate is 7.2%, and drying shrinkage is 0.64mm/m.
Embodiment 6
A kind of low density composite foaming cement is by weight ratio: 100 parts of aluminosulfate cements, 10 parts in flyash, 1.5 parts of redispersable latex powders, 2.5 parts of calcium stearates, 1 part of organosilicon moisture repellent, 0.5 part of methyl cellulose ether, 0.5 part of polypropylene fibre, 0.2 part of cocoanut fatty acid diethanolamide, 6.2 parts in hydrogen peroxide, 65 parts in water.
Preparation method: press each component materials of proportion speed weighing, material (not containing hydrogen peroxide) is added in the stirrer successively, stir after 5 minutes, add hydrogen peroxide and stirred casting natural curing 20 seconds.
After tested, made low density composite foaming cement dry density is 196kg/m
3, thermal conductivity is 0.051W/ (mK), and ultimate compression strength is 0.32MPa, and water-intake rate is 7.8%, and drying shrinkage is 0.70mm/m.
Claims (10)
1. low-density foamed cement and preparation method thereof, it is characterized in that: adopt the foaming at normal temp technology, each component proportion of this foam cement is cement 100 weight parts, active admixture 10-50 weight part, redispersable latex powder 1-5 weight part, hydrophober 1-4 weight part, ether of cellulose 0.5-1.5 weight part, fortifying fibre 0.3-0.7 weight part, suds-stabilizing agent 0.2-0.5 weight part, whipping agent 3-8 weight part, water 50-80 weight part.
2. cement according to claim 1 is characterized in that described cement is one or two or more kinds of silicate cement, sulplo-aluminate and high-alumina cement.
3. active admixture according to claim 1 is characterized in that described active admixture is one or more in silicon ash, flyash, the slag powders.
4. hydrophober according to claim 1 is characterized in that described hydrophober is one or more of organosilicon moisture repellent, silylation hydrophober, fatty acid metal salt hydrophober such as calcium stearate, aluminum stearate.
5. ether of cellulose according to claim 1 is characterized in that described ether of cellulose is one or more of methyl cellulose ether, hydroxypropyl methyl cellulose ether, methyl hydroxyethylcellulose ether.
6. whipping agent according to claim 1 is characterized in that described whipping agent is a kind of of hydrogen peroxide, aluminium powder, sodium bicarbonate.
7. fortifying fibre according to claim 1 is characterized in that described fortifying fibre is one or two or more kinds of polypropylene fibre, carbon fiber and vinylon fibre.
8. described suds-stabilizing agent according to claim 1 is characterized in that described suds-stabilizing agent is one or more of Sodium dodecylbenzene sulfonate, ACRYLIC EMULSION, trolamine, cocoanut fatty acid diethanolamide, glycollic amide.
9. described independent use silicate cement prepares low-density foamed cement according to claim 1, it is characterized in that: also need add hardening accelerator 1-3 weight part; Described hardening accelerator is one or more mixing of sodium sulfate, sodium aluminate, nitrocalcite, Quilonum Retard or calcium formiate.
10. according to the preparation method of the described low-density foamed cement of claim 1, comprise the steps:
(1) each component is pressed the proportion speed weighing;
(2) cement, active admixture, redispersable latex powder, hydrophober, ether of cellulose, fortifying fibre, suds-stabilizing agent and water are added in the stirrer successively, stirred 2-8 minute, become cement slurry;
(3) in the cement slurry that step (2) makes, add whipping agent by proportioning, stir 10-60 after second, casting, natural curing gets final product.
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Application publication date: 20130410 |