CN107117852B - Foam concrete nano foaming agent composition and building block thereof and manufacturing method thereof - Google Patents
Foam concrete nano foaming agent composition and building block thereof and manufacturing method thereof Download PDFInfo
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- CN107117852B CN107117852B CN201710183416.5A CN201710183416A CN107117852B CN 107117852 B CN107117852 B CN 107117852B CN 201710183416 A CN201710183416 A CN 201710183416A CN 107117852 B CN107117852 B CN 107117852B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
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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
- C04B2111/40—Porous or lightweight materials
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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
- C04B2111/52—Sound-insulating materials
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
Compared with other foam concrete on the market, the foam concrete prepared by using the nano foaming agent composition can save 40% of cement dosage and reduce 40% of product weight when the same engineering strength is met. This provides a great profit margin for the foam concrete or foam cement panel manufacturer. In addition, the nano foaming agent composition greatly improves the strength, durability and waterproofness of common foam concrete. For example, at the same density, the strength of the foamed concrete produced using the nano-blowing agent composition of the present invention is increased by 2-5 times and the water absorption is reduced by 8-10 times compared to the foamed concrete produced using commercial blowing agents.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a concrete nano foaming agent composition, a concrete nano foaming agent block and a manufacturing method of the concrete nano foaming agent composition.
Background
The foam concrete is prepared by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine and uniformly mixing foam and cement slurry. And then cast-in-place construction or mould forming is carried out through a pumping system of a foaming machine, and the novel light heat-insulating material containing a large number of closed air holes is formed through natural maintenance. As a novel energy-saving environment-friendly building material, a large amount of research and development are carried out on the building material by domestic and foreign scholars, so that the building material is widely applied to wall materials. The advantages are that: has the advantages of low density, light weight, heat preservation, sound insulation, shock resistance and the like. However, it has some defects, such as low strength, cracking, water absorption, etc. In addition to the reasons of mixing ratio, process flow, equipment and the like, the key factor for restricting the performance of the foam concrete is the stability of foam generated by the foaming agent.
Blowing agents have been used in china for over 50 years. In the early 50 s of the last century, china developed two blowing agents, rosin soap and rosin thermopolymer, for mortar and foam concrete. The two foaming agents are widely applied in China for decades and are familiar to the building material and building industry, and the foaming agent is the first foaming agent in China and still has great application to date. After the 80's of the last century, with the rise of the Chinese surfactant industry, synthetic surfactant type foaming agents began to be used and replaced a considerable portion of rosin soaps and rosin thermopolymers, becoming a major variety of foaming agents. This is a development stage of second generation blowing agents in China. At the end of the last century, high-performance protein foaming agents in developed countries such as italy, japan, korea and the united states abroad began to enter china with the market of china being opened, and gradually showed the advantage of high stability, and have been widely used. Under the promotion of foreign protein foaming agents, various brands of animal protein foaming agents are also developed in Qinghai and other places in China, plant protein foaming agents also begin to appear, popularize and apply in the southeast coastal areas, and China enters the development and application period of third-generation foaming agents. Today, Chinese foaming agents are transitioning from the third generation to the fourth generation, and the foaming agents gradually develop from single components to multi-component compounding.
However, none of these four generation foaming agents has a concept of stabilizing the foam with a macromolecule by foaming with a surfactant. The stability of the foam produced by domestic blowing agents, or by foreign companies such as BASF, GRACE, cannot be compared with the stability of the foam produced by nano blowing agents in the literature using nanoparticles as foam stabilizers (Langmuir 2006,22, 10983). However, the high amounts of nanoparticles mentioned in the literature for stabilizing the foam, up to 45-50 vol%, make it impossible to use them industrially due to the high expensive content of nanoparticles. The U.S. patent (US patent 20090325780) reduces the amount of nanoparticles to 1 vol%, but the cost of the nano-blowing agent produced therewith is still high and not competitive in the market. Therefore, the development of the nano foaming agent which has low cost and can generate high-stability foam for producing light high-strength foam concrete building materials has positive social and economic significance.
Disclosure of Invention
In order to overcome the problems that the nano foaming agent composition in the prior art is still high in cost, large in dosage and the like and is not suitable for practical production, the invention provides a concrete nano foaming agent composition, a building block and a manufacturing method thereof.
The technical scheme adopted by the invention is as follows: a foam concrete nano foaming agent composition comprises a foaming agent and a foam stabilizer, wherein the foaming agent is a surfactant; the foam stabilizer is a nano particle, and has the innovation points that: the viscosity regulator is a high-molecular mixture, and the high-molecular mixture comprises: polyacrylamide, methylcellulose, polyvinyl alcohol, polyethylene oxide, and polyacrylic acid.
On the basis, the proportion of each high molecular component in the high molecular mixture is as follows: 1-30% of polyacrylamide, 30-70% of methylcellulose, 10-50% of polyvinyl alcohol, 10-50% of polyoxyethylene and 1-30% of polyacrylic acid.
On the basis, the proportion of each high molecular component in the high molecular mixture is as follows: 1-10% of polyacrylamide, 45-55% of methylcellulose, 20-30% of polyvinyl alcohol, 20-30% of polyoxyethylene and 1-5% of polyacrylic acid.
On the basis, the addition proportions of the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are as follows: 1-40% of surfactant, 50-85% of viscosity regulator and 1-30% of nano particle foam stabilizer.
On the basis, the addition proportions of the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are as follows: 10-20% of surfactant, 70-80% of viscosity regulator and 5-10% of nano particle foam stabilizer.
On the basis, the foaming agent consists of a novel surfactant with a hydrophilic group carboxyl group and a long-chain hydrophobic group hydrocarbon group, a single hydrophilic group rosin soap and a conventional surfactant with a sulfonic acid group.
On this basis, the nanoparticles are selected as: nano silicon oxide, nano calcium carbonate, nano titanium oxide, nano aluminum oxide, nano zinc oxide or nano zirconium oxide.
Another object of the present invention is to provide a foamed concrete block using a nano-foaming agent composition, which is innovative in that: comprises the following components: cement slurry, polystyrene foam aggregate and a nano foaming agent composition; the polystyrene foam aggregate is cement slurry, and the nano foaming agent composition is (8000-16000), and (2000-4000) 1.0.
Alternatively, in another embodiment of the present invention, a foamed concrete block using a nano-foaming agent composition is characterized in that: comprises the following components: a cement slurry and a nano-foaming agent composition; the cement slurry is prepared from (2000-4000) 1.0 parts of a nano foaming agent composition.
On the basis, the formula comprises the following components: cement slurry, polystyrene foam aggregate and a nano foaming agent composition; the polystyrene foam aggregate, the cement slurry and the nano foaming agent composition are 12000:3000: 1.0.
Alternatively, another embodiment of the present invention comprises the following ingredients: a cement slurry and a nano-foaming agent composition; the cement slurry is formed by mixing a nano foaming agent composition 3000: 1.0.
It is still another object of the present invention to provide a method for manufacturing a foamed concrete block in an embodiment in which polystyrene aggregate is added, the method comprising: the method comprises the following steps:
s1: directly and uniformly mixing the foaming agent, the viscosity regulator and the nano particle foam stabilizer powder;
s2: dissolving the nano foaming agent composition prepared in the S1 by stirring with distilled water or low-hardness water as a solvent; the ratio range of the nano foaming agent composition to the water is 1: 200-400;
s3: beating foams from the nano foaming agent composition solution prepared in the step S2 by using foaming machine equipment, mixing the foams with cement slurry and polystyrene foam aggregate, and stirring the foams with coarse force to prepare foam cement slurry;
s4: and casting the foamed cement slurry in the S3 to form the foamed concrete block.
On this basis, the specific steps of S3 are:
s31: crushing the polystyrene foam aggregate into particles with the particle size of less than or equal to 0.51 cm;
s32: mixing the crushed polystyrene foam aggregate in the step S31 with cement slurry, and uniformly mixing to form mixed slurry;
s33: adding water into the nano foaming agent composition in a maximum proportion of 200-400 times and an optimal proportion of 330 times to prepare a solution, beating out foam by using special foaming machine equipment, mixing the mixed slurry and the foam, and stirring with coarse force to form foamed cement slurry.
It is still another object of the present invention to provide a method for manufacturing a foamed concrete block according to an embodiment without adding polystyrene aggregate, wherein the method comprises the steps of: the method comprises the following steps: s1: directly and uniformly mixing the foaming agent, the viscosity regulator and the nano particle foam stabilizer powder;
s2: dissolving the nano foaming agent composition prepared in the S1 by stirring with distilled water or low-hardness water as a solvent; the ratio range of the nano foaming agent composition to the water is 1: 200-400;
s3: adopting foaming machine equipment to beat foam from the prepared nano foaming agent composition solution in the S2, mixing the foam with cement slurry, and stirring the mixture with coarse force to prepare foamed cement slurry;
s4: and casting the foamed cement slurry in the S3 to form the foamed concrete block.
Compared with the prior art, the invention has the beneficial effects that:
(1) the novel nano foaming agent composition is used for producing light building materials with unique performance. The nano foaming agent composition contains special nano particles, can react with other components in the foaming composition to generate foam with extremely small pore diameter and excellent stability, so that the foam concrete produced by the nano foaming agent composition has pores with uniform dispersion and extremely small size, and has unique excellent performance.
(2) In the novel nano foaming agent composition, the nano particles can be distributed on the surface of bubbles in a single layer to play a stabilizing role, so that the dosage of the nano particles is extremely low, and the dilutability multiple of the foaming composition is extremely high when the foaming composition is used. The blowing agent manufacturers in the current Chinese market are limited by the long-distance transportation cost because the concentration (dilution factor) of the blowing agent manufacturers is usually only about 20 times, and the blowing agent manufacturers can only supply the blowing agent to local markets. The fact that the concentration (dilutability) of the foaming composition of the present invention is 330 times and is more than 15 times that of other products means that the foaming composition of the present invention can be supplied to the entire Chinese market due to its extremely low transportation cost.
(3) The viscosity modifier, the foaming agent and the nanoparticles contained in the invention can make the foaming agent completely dissolved in 330 times of water to form a solution within one hour by adjusting the proportion content of the three components and the proportion of the high molecular component in the high molecular mixture (viscosity modifier). The foaming composition solution can generate stable foam with the volume being 12 times, and then the foam and the cement paste are mixed according to the proportion required by engineering, so that more various foam concrete products with various densities can be obtained.
(4) When the foam concrete or the concrete block prepared by the invention meets the same engineering strength, tests prove that the cement consumption can be saved by 40 percent, and the product weight can be reduced by 40 percent. This provides a great profit margin for the foam concrete or foam cement panel manufacturer. In addition, the nano foaming agent composition can greatly improve the strength, durability and waterproofness of common foam concrete. For example, at the same density, the strength of the foamed concrete produced by the nano foaming agent composition is improved by 2-5 times compared with the foamed concrete produced by the commercial foaming agent, and the water absorption rate is reduced by 8-10 times, which greatly expands the market and application range of the foamed concrete product.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a nano foaming agent composition for foam concrete, which comprises a foaming agent and a foam stabilizer, wherein the foaming agent is a surfactant; the foam stabilizer is a nanoparticle, and as an inventive point of the present invention, in this embodiment of the present invention, the foam stabilizer further includes a viscosity regulator, where the viscosity regulator is a polymer mixture, and the polymer mixture includes polyacrylamide, methylcellulose, polyvinyl alcohol, polyethylene oxide, and polyacrylic acid; in the invention, the addition of the polymer mixture viscosity regulator can better ensure that the surface tension of the liquid can be effectively reduced by matching with the surfactant under the liquid state of the composition per se to a great extent, the foaming rate is higher, the formed foam quantity is increased, when the same engineering strength is met, the cement dosage can be saved by 40 percent, the product weight can be reduced by 40 percent, and the polymer components are selected and mixed to play a synergistic cooperation role with the foaming agent and the foam stabilizer. More preferably, the ratio of each polymer component in the polymer mixture is: 1-30% of polyacrylamide, 30-70% of methylcellulose, 10-50% of polyvinyl alcohol, 10-50% of polyoxyethylene and 1-30% of polyacrylic acid. The reason why the amount of methylcellulose added is selected at the highest is that, at the same concentration, the viscosity of the aqueous solution of methylcellulose is the highest as compared with other water-soluble polymers, and the aqueous solution of methylcellulose serves as a main foam stabilizer, whereby the viscosity of the foaming agent solution can be sufficiently increased at a low concentration and the foam can be sufficiently stabilized. Secondly, in the invention, the polyvinyl alcohol and the polyoxyethylene are selected to be added in the same range because the solubility of the polyvinyl alcohol and the polyoxyethylene is similar to the viscosity of the aqueous solution, and the polyvinyl alcohol and the polyoxyethylene can be replaced mutually, so that the polyvinyl alcohol and the polyoxyethylene are added in the same range, which is taken as an invention point of the invention, and the methyl cellulose has the largest viscosity and plays a foam stabilizing role in selecting the dosage control range of each component, so the dosage is the largest; and other water-soluble polymers are mainly used for enhancing the compatibility of the foam and cement paste in the foam, enhancing the mechanical strength of a foam cement product and ensuring that the surface of the prepared foam cement building block is smooth and does not fall off.
More preferably, the optimal mixing ratio of each polymer component in the polymer mixture is as follows: 1-10% of polyacrylamide, 45-55% of methylcellulose, 20-30% of polyvinyl alcohol, 20-30% of polyoxyethylene and 1-5% of polyacrylic acid. The proportion range is selected, the hook can be hooked with the production cost, the required effect can be achieved while raw materials are saved, meanwhile, the surface tension of liquid is effectively reduced by matching with a surfactant, the large foaming rate is achieved, the formed foam quantity is more, when the same engineering strength is met, the cement using amount can be saved by 45%, and the product weight is reduced by 42%.
As another aspect of the present invention, in this embodiment of the present invention, it is emphasized that the nano-foaming agent composition for foam concrete comprises the following components in its entirety: the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are added in the following proportion: 1-40% of surfactant, 50-85% of viscosity regulator and 1-30% of nano particle foam stabilizer. Preferably, the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are added in a proportion of 10-20% of the surfactant, 70-80% of the viscosity regulator and 5-10% of the nanoparticle foam stabilizer. In the invention, the foaming agent can be completely dissolved in 330 times of water to form a solution within one hour by adjusting the proportion content of the three components and the proportion of the high molecular component in the high molecular mixture (viscosity regulator) in a characteristic way. The foaming agent solution can be generated into stable foam with the volume being 12 times, and then the foam and the cement paste are mixed according to the proportion required by engineering, so as to obtain foam concrete products with various densities.
As another aspect of the present invention, in this embodiment of the present invention, the nanoparticles are selected from nano-silica, nano-calcium carbonate, nano-titania, nano-alumina, nano-zinc oxide, or nano-zirconia, and the nano-ions are alternatively used.
Among these, the most preferred one is the nano-alumina, and this nano-particle contained in the present invention is selected and tested to react with other components in the blowing agent composition to produce foams with very small pore size (e.g., up to 65 μm) and excellent stability, so as to ensure that the foamed concrete produced therefrom has pores with uniform dispersion and extremely small size, thereby having unique and excellent properties. In the invention, the nano-particle dosage is reduced, and the nano foaming agent composition produced by the nano-particle dosage is low in cost, so that the nano-particle foaming agent composition has strong market competitiveness.
The main invention point of the invention is not in the particularity of the nano particles, but in the special formula, the aim of extremely low addition amount of the whole nano particles in the foam cement is realized. With the formulation, the content of the nano particles in the foaming agent is 5-10%, and the content of the foaming agent in the foam cement is only 1/3000, namely, the content of the nano particles in the foam cement product is less than 1/30000. There are significant cost advantages over other inventions. In addition, the performance of the foam cement product is more important creativity of the invention, namely when the 3.5MPa compressive strength is met, the density of the foam cement building block is about 40 percent lower than that of other products, and the cement is saved by about 40 percent.
It is another object of the present invention to provide a foamed concrete block using a nano-blowing agent composition, which, in this embodiment of the invention, comprises the following ingredients: cement slurry, polystyrene foam aggregate and a nano foaming agent composition; the polystyrene foam aggregate is cement slurry, and the nano foaming agent composition is (8000-16000), and (2000-4000) 1.0. More preferably, the foamed concrete block includes the following components: cement slurry, polystyrene foam aggregate and a nano foaming agent composition; the polystyrene foam aggregate, the cement slurry and the nano foaming agent composition are 12000:3000: 1.0. When the foam concrete block is adopted, the strength of the foam concrete produced by adopting the nano foaming agent composition is improved by 2-5 times compared with the foam concrete produced by adopting the foaming agent on the market, and the water absorption rate is reduced by 8-10 times (for example, the water absorption rate can reach less than 7%), compared with the water absorption rate of the product on the market which is up to more than 40%, the water absorption rate is greatly reduced, and the advantage can greatly expand the market and the application range of the foam concrete product. In this embodiment of the invention, the noted blowing agent is comprised of a hydrophilic polymer. The group carboxyl, a novel surfactant of a long-chain hydrophobic group alkyl, a rosin soap of a single hydrophilic group and a conventional surfactant with a sulfonic group. Of course, other foaming agents may be used in the present invention, and are not limited herein. In the invention, the foaming agent adopts a plurality of surfactants to be combined for use, so that the foaming effect is good and the foaming efficiency is high.
It is a further object of the present invention to disclose the method for manufacturing the above-mentioned foamed concrete block, comprising the steps of:
s1: directly and uniformly mixing the foaming agent, the viscosity regulator and the nano particle foam stabilizer powder.
S2: dissolving the nano foaming agent composition prepared in the S1 by stirring with distilled water or low-hardness water as a solvent; the maximum ratio range of the nano foaming agent to the water is 1: 200 to 400.
S3: and (4) beating foams from the nano foaming agent solution prepared in the step (S2) by adopting a foaming machine, and mixing the foams with the cement slurry and the polystyrene foam aggregate to prepare the foamed cement slurry.
S4: and casting the foamed cement slurry in the S3 to form the foamed concrete block.
Specifically, the specific step of S3 is:
s31: crushing the polystyrene foam aggregate into particles with the particle size of less than or equal to 0.51 cm;
s32: mixing the crushed polystyrene foam aggregate in the step S31 with cement slurry, and uniformly mixing to form mixed slurry;
s33: adding water into the nano foaming agent composition in a maximum proportion of 200-400 times and an optimal proportion of 330 times to prepare a solution, beating out foam by using special foaming machine equipment, mixing the mixed slurry and the foam, and stirring with coarse force to form foamed cement slurry.
In the manufacturing method, the produced foam concrete block has the characteristics of light weight, high strength, water resistance, moisture resistance, fire resistance, flame retardance, sound insulation, heat insulation, comfortable living and the like, and the product has rich raw material sources and low cost; the production process is simple, practical and convenient.
Light weight, high strength, reduced load of building, dry mass density of 300-31/2-1/8 for ordinary concrete or block;
the thermal conductivity coefficient is 0.06-0.16w/m.k, the sound insulation quantity of a wall body with the thickness of 24cm is 58dB, and the requirements of thermal insulation and sound insulation of an external wall and a household wall of a building are met;
the compressive strength is more than 0.5Mpa, the highest strength can reach more than 40.0 Mpa;
the foam concrete block has small-size air holes and low elastic modulus due to the adoption of the nano foaming agent composition, so that the foam concrete block has good absorption and dispersion effects on shock impact load, and meanwhile, the foam concrete block has light weight, so that the load of a building is effectively reduced, and the smaller the load of the building is, the stronger the shock resistance is;
the foam concrete block does not crack and has long service life, namely, the foam concrete block does not crack and hollows, does not need to be coated with an interface agent when in use, and has outstanding ageing resistance and long service life;
the water resistance is good: the water absorption of the foam concrete material is lower than 7 percent and is obviously lower than that of other self-insulation materials for walls.
It is well known that fluctuations in the local building material market directly cause their financial risk, since other blowing agent manufacturers have geographical limitations on sales due to high transportation costs. For the enterprises producing the product of the invention, the product can be sold into the whole China market due to extremely low transportation cost (1/15 of other competitors only) and excellent product performance competitiveness. The following example makes an intuitive analysis:
example 1
The foam cell size and physical foam density of the commercial product were compared with the foam cell size of the inventive nano-blowing agent composition, as shown in table 1.
TABLE 1
The physical foaming density of the foam concrete using the nano foaming agent composition of the invention is as low as 220 kg/m3. In addition, in the present embodiment, the size of the foam cells of the commercial product is large,>500 μm; the foam concrete using the nano foaming agent composition has small nano foam pore size of 65 mu m.
The invention greatly improves the strength, durability and waterproofness of the common foam concrete. For example, at the same density, the high mechanical strength of the foam concrete produced by the invention is improved by 2-5 times compared with the foam concrete produced by the commercial foaming agent, and the water absorption is reduced by 8-10 times. In addition, the foam concrete also has fireproof and flame-retardant properties.
In Table 2, the nano-foam concrete of the invention is compared with the GB 11968-2006 (autoclaved concrete) and JG/T266-2011 (foam concrete) standards:
TABLE 2
| Nano foam concrete | Steam-pressurized foam concrete | Ordinary foam concrete | |
| Density kg/cm3 | 550 | 600 | 600 |
| Strength Mpa | 3.5 | 3.5 | 1.5 |
| Coefficient of thermal conductivity W/m.k | 0.14 | 0.16 | 0.14 |
Compared with the foaming agent on the market, the nano foaming composition has the following performance advantages:
for example, the present invention utilizes 300g of cement + aggregate, with 100L of the nano-foaming composition added to form 1200L of foam. Further, for example, 60g of cement + aggregate was added to 20L of the nano-foaming composition to form 240L of foam. See table 3 below, the performance advantages of the nano-foamed compositions of the present invention compared to commercial blowing agents:
TABLE 3
Example 2
Engineering case 1
The nano foaming composition is used for manufacturing the light high-strength fireproof heat-insulating wallboard.
There are two types of wallboard products (1) traditional foam cement wallboard: density 1000kg/m3The requirement of 3.5MPa can be met. (2) The density and the strength of the sandwich foam cement wallboard reach the standard, the sandwich foam cement wallboard is gradually popularized in the market, but the preparation process is complex, and the material is expensive.
The foam cement board produced by the nano foaming composition does not need an outer coating interlayer, has the density of 600kg/m3 and the strength of 3.5MPa, and meets the engineering standard. For example, 5kg of the present nanofoaming composition can produce 2200 pieces (300X 90 mm)3) With conventional blowing agents 80k is required to produce the same amount.
Example 3
Engineering case 2
Because the product of the invention has excellent low water absorption, the invention can sufficiently meet the requirement of reinforcing the hyperbolic arch bridge of the Nanjing Changjiang river bridge: and (4) filling foam concrete on the arch.
Due to the excellent properties of the invention, the product of the invention can be directly used for construction casting (building insulation), thermal insulation materials for exterior walls, sound insulation materials for outdoor and indoor use, landscaping applications, and applications in certain special fields, such as 3D printing field materials, landfill field materials, explosion-proof field materials, materials in the field of ground barrier systems, and the like.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A foam concrete nano foaming agent composition comprises a foaming agent and a foam stabilizer, wherein the foaming agent is a surfactant; the foam stabilizer is a nanoparticle and is characterized in that: the viscosity regulator is a high-molecular mixture, and the high-molecular mixture comprises: polyacrylamide, methylcellulose, polyvinyl alcohol, and polyethylene oxide and polyacrylic acid; the mass ratio of each high molecular component in the high molecular mixture is as follows: 1-30% of polyacrylamide, 30-70% of methylcellulose, 10-50% of polyvinyl alcohol, 10-50% of polyoxyethylene and 1-30% of polyacrylic acid; the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are added in the following mass ratio: 1-40% of surfactant, 50-85% of viscosity regulator and 1-30% of nano particle foam stabilizer; the nano particles are selected from: nano silicon oxide, nano calcium carbonate, nano titanium oxide, nano aluminum oxide, nano zinc oxide or nano zirconium oxide.
2. The foamed concrete nano-blowing agent composition of claim 1, characterized in that: the mass ratio of each high molecular component in the high molecular mixture is as follows: 1-10% of polyacrylamide, 45-55% of methylcellulose, 20-30% of polyvinyl alcohol, 20-30% of polyoxyethylene and 1-5% of polyacrylic acid.
3. The foamed concrete nano-blowing agent composition of claim 1, characterized in that: the surfactant, the viscosity regulator and the nanoparticle foam stabilizer are added in the following mass ratio: 10-20% of surfactant, 70-80% of viscosity regulator and 5-10% of nano particle foam stabilizer.
4. A foamed concrete block using the nano-blowing agent composition of claim 1, characterized in that: comprises the following components: a cement slurry and a nano-foaming agent composition; the mass ratio of the nano foaming agent composition to the cement slurry is (2000-4000): 1.0.
5. The foamed concrete block of claim 4, wherein: comprises the following components: a cement slurry and a nano-foaming agent composition; the mass ratio of the cement slurry to the nano foaming agent composition is 3000: 1.0.
6. A method of manufacturing the foamed concrete block of claim 4, characterized in that: the method comprises the following steps:
s1: directly and uniformly mixing the foaming agent, the viscosity regulator and the nano particle foam stabilizer powder;
s2: dissolving the nano foaming agent composition prepared in the S1 by stirring with distilled water or low-hardness water as a solvent; the mass ratio range of the nano foaming agent composition to water is 1: 200-400;
s3: adopting foaming machine equipment to beat foam from the prepared nano foaming agent composition solution in the S2, mixing the foam with cement slurry, and stirring the mixture with coarse force to prepare foamed cement slurry;
s4: and casting the foamed cement slurry in the S3 to form the foamed concrete block.
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