CN114163171B - Greening brick and preparation method thereof - Google Patents
Greening brick and preparation method thereof Download PDFInfo
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- CN114163171B CN114163171B CN202210126775.8A CN202210126775A CN114163171B CN 114163171 B CN114163171 B CN 114163171B CN 202210126775 A CN202210126775 A CN 202210126775A CN 114163171 B CN114163171 B CN 114163171B
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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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
- C04B40/02—Selection of the hardening environment
- C04B40/0204—Selection of the hardening environment making use of electric or wave energy or particle radiation
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a greening brick, which comprises desert sand grains, bentonite, zeolite powder, modified borax, a humectant, a gelling agent, a reinforcing agent, activated carbon, a curing agent and nano boron nitride powder; the preparation method of the greening brick comprises the steps of preparing a base material, preparing an additive, preparing a mixture, pressing the mixture to obtain a pressed primary greening brick, carrying out low-temperature plasma treatment, carrying out microwave irradiation treatment and maintaining; the preparation method of the invention can improve the air permeability of the greening brick, ensure the high strength, good water resistance and rapid curing of the greening brick and simultaneously improve the water retention capacity of the greening brick.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a greening brick and a preparation method thereof.
Background
With the continuous development of current socioeconomic, the ecological environment is destroyed, the grassland and forest gradually degenerate, and environmental problems such as desertification attract attention. Due to the special climatic conditions of desert areas, ecological reversal is difficult to realize by only depending on natural recovery, and the ecological environment is required to be reformed through human factor intervention. At present, three methods are mainly used for desert control at home and abroad: engineering sand fixation, biological sand fixation, and chemical sand fixation.
Engineering sand fixation is also called mechanical sand fixation, a physical mechanical method is adopted to block shifting of quicksand, generally, sand barriers are built, grass grids are laid, the sand fixation effect can be seen in the method for a short time, but the protection height is limited, and the quicksand is easily buried; biological sand fixation, also called plant sand fixation, is the most common and effective method at present, and comprises a sand sealing and forest cultivating technology, an airplane seeding technology and a windproof and sand fixation forest building technology; the organic composite shell body formed by gluing the microorganisms in algae, lichens, moss and soil and other related organisms with soil surface layer particles through mycelia, rhizoids, secretions and the like is called biological crust, so that the growth and the propagation of the organic composite shell body can be ensured, the microenvironment of the soil can be changed through biological metabolism, but the biological crust coverage is high, and the use cost is also high; chemical sand fixation agent is sprayed on the surface of desertified sand grains to form a sand fixation and consolidation layer on the surface of the desertified sand grains, so that sand dunes are stabilized to move, soil conditions are improved, the chemical sand fixation agent is usually used together with biological sand fixation, but the chemical sand fixation agent has low strength, is easy to age, needs to be sprayed regularly and has high labor cost.
The greening brick belongs to one of chemical sand fixation, has the characteristics of higher consolidation strength, good water absorption and retention, good water resistance, rapid solidification and good cohesiveness, but the existing greening brick has poor air permeability and is not beneficial to plant growth, although some technicians in the prior art also make the greening brick into a porous shape and can improve the air permeability of the greening brick, the made greening brick has low strength and poor water retention capacity, in desert, the greening brick is sunned hotter by the sun in the daytime to evaporate water in the desert, and when the water is not enough to replenish, the plant is easily dried. Therefore, the development of a greening brick which can improve the water retention capacity while improving the air permeability, ensuring high strength, good water resistance and rapid solidification is a technical problem which is urgently needed to be solved at present.
Chinese patent CN101386502B discloses a preparation method of a porous desert greening brick, which comprises the steps of fully mixing bentonite and sand, adding water glass, and fully stirring; the mixed material is put into a die to be molded and pressed, and then the mixed material is completely soaked in AlCl3Curing in the solution, curing after curing and forming; the preparation method has simple process, convenient operation and low cost, but the prepared desert greening brick has poor water retention capacity due to the porous shape, and is easy to cause plant water loss.
Chinese patent CN101386503B discloses a desert greening brick prepared by an inorganic gelling technology, wherein water glass and sand are fully mixed, and the dosage of the water glass used for every 12kg of sand is between 1000-2000 ml; the mixture is fully soaked in AlCl after being subjected to compression molding3Curing in the solution, curing after curing and forming; the preparation method has the advantages of simple process, simple and convenient operation and low cost, but the prepared greening brick has poor air permeability and is not beneficial to plant growth.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the greening brick and the preparation method thereof, which can improve the air permeability of the greening brick, ensure the high strength, good water resistance and quick curing of the greening brick and simultaneously improve the water retention capacity of the greening brick.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a greening brick sequentially comprises the steps of preparing a base material, preparing an additive, preparing a mixture, pressing the mixture to obtain a pressed primary greening brick, carrying out low-temperature plasma treatment, carrying out microwave irradiation treatment and maintaining.
The preparation method comprises the steps of preparing a base material, mixing and stirring desert sand grains, bentonite, zeolite powder, modified borax, a reinforcing agent, activated carbon and nano boron nitride powder uniformly, and then carrying out ultrasonic oscillation, wherein the frequency of the ultrasonic oscillation is controlled to be 30-50kHz, the time of the ultrasonic oscillation is 1-1.5 hours, and the base material is obtained after the ultrasonic oscillation is finished;
the preparation method of the modified borax comprises the following steps: placing borax in a ball mill for ball milling to obtain borax powder after the ball milling is finished, mixing the borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water, stirring at 40-45 ℃, obtaining borax liquid after the stirring is finished, and drying the borax liquid at 140-150 ℃ for 1.5-2h to obtain the modified borax.
The ball-material ratio in the ball milling process in the preparation of the modified borax is 20-25: 1, the rotating speed of the ball mill is 300-.
In the preparation of the modified borax, the mass ratio of borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water is 10-12: 15-20: 3-4: 1-2: 30-40.
In the preparation of the modified borax, the stirring speed is 150-200rpm, and the stirring time is 1-1.5 h.
The preparation of the additive comprises the steps of mixing and stirring the humectant, the gelling agent and the curing agent uniformly, and then carrying out ultraviolet treatment, wherein the wavelength of the ultraviolet treatment is controlled to be 200-250nm, and the time of the ultraviolet treatment is 20-30min, so as to obtain the additive;
the preparation method of the humectant comprises the following steps: mixing and stirring trehalose, sodium alginate, anionic polyacrylamide and sodium pyrophosphate uniformly to obtain the humectant.
In the preparation of the humectant, the mass ratio of trehalose to sodium alginate to anionic polyacrylamide to sodium pyrophosphate is (20-25): 10-15: 6-10: 12-15.
The molecular weight of the anionic polyacrylamide is 1000-1200 ten thousand, and the charge density is 30-40 mol%.
The low-temperature plasma treatment is to place the pressed primary greening brick in low-temperature plasma treatment equipment for low-temperature plasma treatment, wherein the treatment temperature in the treatment process is 8-12 ℃, the treatment power is 250-300W, and the treatment time is 5-7 min;
the preparation method comprises the steps of preparing a mixture, adding an additive into a base material, and fully mixing and uniformly stirring to obtain a mixture;
the mixture is pressed to obtain a pressed primary greening brick, the mixture is filled into a die and pressed under the pressure of 5-8MPa, the pressing time is controlled to be 3-5min, and the pressed primary greening brick is obtained after pressing;
performing microwave irradiation treatment, namely performing microwave irradiation on the greening brick subjected to the low-temperature plasma treatment, and obtaining a primary greening brick subjected to the microwave irradiation treatment after the microwave irradiation is finished;
the power in the microwave irradiation process is 500-600W, the temperature of the microwave irradiation is 50-60 ℃, and the time of the microwave irradiation is 5-7 min;
and (3) maintaining, namely maintaining the primary greening brick subjected to the microwave irradiation treatment for 3-5 days in an environment with the temperature of 50-60 ℃ to obtain the greening brick.
The greening brick comprises the following components in parts by weight: 100 portions of desert sand grains, 35 to 40 portions of bentonite, 30 to 35 portions of zeolite powder, 10 to 15 portions of modified borax, 5 to 8 portions of humectant, 5 to 7 portions of gelling agent, 4 to 6 portions of reinforcing agent, 3 to 5 portions of active carbon, 1 to 2 portions of curing agent and 0.5 to 1 portion of nano boron nitride powder.
The particle size of the nanometer boron nitride powder is 50-80 nm.
The preparation method of the gelling agent comprises the following steps: mixing xanthan gum, sodium chloride, calcium chloride, chitosan and polyvinyl alcohol 1788, uniformly stirring to obtain a primary gelling agent, and carrying out microwave oscillation on the primary gelling agent to obtain the gelling agent after the microwave oscillation is finished.
In the preparation of the gelling agent, the mass ratio of the xanthan gum, the sodium chloride, the calcium chloride, the chitosan and the polyvinyl alcohol 1788 is 30-35: 2-5: 4-5: 10-12: 7-10.
The microwave intensity of the microwave oscillation in the preparation of the gelling agent is 120-150W, and the microwave oscillation time is 10-15 min.
The preparation method of the reinforcing agent comprises the following steps: and mixing and stirring the calcium carbonate, the magnesium carbonate, the nano silicon dioxide and the sodium sulfate uniformly to obtain the reinforcing agent.
The reinforcing agent is prepared from calcium carbonate, magnesium carbonate, nano silicon dioxide and sodium sulfate in a mass ratio of 20-25: 3-5: 2-5: 1-2.
The preparation method of the curing agent comprises the following steps: mixing and stirring the pre-gelatinized starch, magnesium hexafluorosilicate hexahydrate, sodium citrate, yellow dextrin and aluminum chloride uniformly, and standing for 3-4h at 40-45 ℃ to obtain the curing agent.
In the preparation of the curing agent, the mass ratio of pregelatinized starch, magnesium hexafluorosilicate hexahydrate, sodium citrate, yellow dextrin and aluminum chloride is 8-10: 15-18: 2-5: 5-7: 2-3.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the preparation method of the greening brick, the borax in the raw materials of the greening brick is modified, and low-temperature plasma treatment is performed in the process of preparing the greening brick, so that the compressive strength, the breaking strength and the thermal shock resistance of the greening brick can be improved, the compressive strength of the prepared greening brick can reach 5.1-5.4MPa, the breaking strength can reach 9.1-9.5MPa, and the thermal shock resistance can reach 60-66 times;
(2) according to the preparation method of the greening brick provided by the invention, the borax in the raw materials of the greening brick is modified and low-temperature plasma treatment is carried out in the process of preparing the greening brick, so that the apparent porosity and the air permeability of the prepared greening brick can be improved, the apparent porosity of the prepared greening brick can reach 57-61%, and the air permeability can reach 310-344-micron2；
(3) The preparation method of the greening brick provided by the invention can improve the water retention capacity of the greening brick by adding the humectant, and carrying out ultraviolet treatment on the humectant, the gelling agent and the curing agent in the preparation process of the greening brick, and the greening brick prepared by the invention is used for covering sand with the water content of 15%, and the red-blue light ratio is 9: 1, the illumination intensity is 600 mu mol/(m)2S) the water content of the sand decreases by 1.5-1.9% after continuous irradiation for 18h under the LED lamp.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
The greening brick comprises the following components in parts by weight: 100 parts of desert sand grains, 35 parts of bentonite, 30 parts of zeolite powder, 10 parts of modified borax, 5 parts of humectant, 5 parts of gelling agent, 4 parts of reinforcing agent, 3 parts of active carbon, 1 part of curing agent and 0.5 part of nano boron nitride powder.
The particle size of the nanometer boron nitride powder is 50 nm.
The preparation method of the modified borax comprises the following steps: placing borax in a ball mill for ball milling, and controlling the ball-to-material ratio in the ball milling process to be 20: 1, the rotating speed of a ball mill is 300rpm, the ball milling time is 1h, the borax powder is obtained after the ball milling is finished, and then the borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water are mixed according to the mass ratio of 10: 15: 3: 1: 30, stirring for 1h at the temperature of 40 ℃, controlling the stirring speed to be 150rpm, obtaining the borax liquid after the stirring is finished, and drying the borax liquid for 1.5h at the temperature of 140 ℃ to obtain the modified borax.
The preparation method of the humectant comprises the following steps: mixing trehalose, sodium alginate, anionic polyacrylamide and sodium pyrophosphate in a mass ratio of 20: 10: 6: 12 mixing and stirring evenly to obtain the humectant.
The molecular weight of the anionic polyacrylamide is 1000 ten thousand, and the charge density is 30 mol%.
The preparation method of the gelling agent comprises the following steps: mixing xanthan gum, sodium chloride, calcium chloride, chitosan and polyvinyl alcohol 1788 in a mass ratio of 30: 2: 4: 10: and 7, uniformly mixing and stirring to obtain a primary gelling agent, carrying out microwave oscillation on the primary gelling agent for 10min, controlling the microwave intensity to be 120W, and finishing the microwave oscillation to obtain the gelling agent.
The preparation method of the reinforcing agent comprises the following steps: mixing calcium carbonate, magnesium carbonate, nano silicon dioxide and sodium sulfate in a mass ratio of 20: 3: 2: 1, mixing and stirring uniformly to obtain the reinforcing agent.
The preparation method of the curing agent comprises the following steps: pre-gelatinized starch, magnesium hexafluorosilicate hexahydrate, sodium citrate, yellow dextrin and aluminum chloride in a mass ratio of 8: 15: 2: 5: 2, mixing and stirring uniformly, and standing for 3 hours at the temperature of 40 ℃ to obtain the curing agent.
A preparation method of a greening brick comprises the following steps:
1. preparing a base material: mixing and stirring desert sand grains, bentonite, zeolite powder, modified borax, a reinforcing agent, activated carbon and nano boron nitride powder uniformly, then carrying out ultrasonic oscillation, controlling the frequency of the ultrasonic oscillation to be 30kHz, controlling the time of the ultrasonic oscillation to be 1 hour, and obtaining a base material after the ultrasonic oscillation is finished;
2. preparing an additive: mixing humectant, gelatinizer, and solidifying agent, stirring, and treating with ultraviolet rays at wavelength of 200nm for 20min to obtain additive;
3. preparing a mixture: adding the additive into the base material, and fully mixing and stirring uniformly to obtain a mixture;
4. pressing: putting the mixture into a die, pressing at the pressure of 5MPa, controlling the pressing time to be 3min, and obtaining a primary greening brick after pressing;
5. low-temperature plasma treatment: placing the primary greening brick in low-temperature plasma treatment equipment for low-temperature plasma treatment, controlling the treatment temperature to be 8 ℃, the treatment power to be 250W and the treatment time to be 5min, and obtaining the greening brick subjected to low-temperature plasma treatment;
6. microwave irradiation treatment: performing microwave irradiation on the primary greening brick subjected to low-temperature plasma treatment, controlling the power of the microwave irradiation to be 500W, controlling the temperature of the microwave irradiation to be 50 ℃, and controlling the time of the microwave irradiation to be 5min to obtain the primary greening brick subjected to microwave irradiation treatment;
7. and (5) maintenance: and (3) maintaining the primary greening brick subjected to the microwave irradiation treatment for 3 days in an environment with the temperature of 50 ℃ to obtain the greening brick.
Example 2
The greening brick comprises the following components in parts by weight: 110 parts of desert sand grains, 38 parts of bentonite, 32 parts of zeolite powder, 12 parts of modified borax, 7 parts of humectant, 6 parts of gelling agent, 5 parts of reinforcing agent, 4 parts of active carbon, 1.5 parts of curing agent and 0.8 part of nano boron nitride powder.
The particle size of the nanometer boron nitride powder is 60 nm.
The preparation method of the modified borax comprises the following steps: placing borax in a ball mill for ball milling, and controlling the ball-to-material ratio in the ball milling process to be 22: 1, the rotating speed of a ball mill is 320rpm, the ball milling time is 1.2h, borax powder is obtained after the ball milling is finished, and then the borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water are mixed according to the mass ratio of 11: 18: 3.5: 1.5: 35, stirring for 1.2 hours at the temperature of 42 ℃, controlling the stirring speed to be 180rpm, obtaining the borax liquid after the stirring is finished, and drying the borax liquid for 1.8 hours at the temperature of 145 ℃ to obtain the modified borax.
The preparation method of the humectant comprises the following steps: trehalose, sodium alginate, anionic polyacrylamide and sodium pyrophosphate are mixed according to a mass ratio of 22: 12: 8: 13 and mixing and stirring uniformly to obtain the humectant.
The molecular weight of the anionic polyacrylamide is 1100 ten thousand, and the charge density is 35 mol%.
The preparation method of the gelling agent comprises the following steps: mixing xanthan gum, sodium chloride, calcium chloride, chitosan and polyvinyl alcohol 1788 in a mass ratio of 32: 3: 4.5: 11: 8, uniformly mixing and stirring to obtain a primary gelling agent, carrying out microwave oscillation on the primary gelling agent for 12min, controlling the microwave intensity to be 140W, and finishing the microwave oscillation to obtain the gelling agent.
The preparation method of the reinforcing agent comprises the following steps: mixing calcium carbonate, magnesium carbonate, nano silicon dioxide and sodium sulfate in a mass ratio of 22: 4: 3: 1.5 mixing and stirring evenly to obtain the reinforcing agent.
The preparation method of the curing agent comprises the following steps: pre-gelatinized starch, magnesium hexafluorosilicate hexahydrate, sodium citrate, yellow dextrin and aluminum chloride in a mass ratio of 9: 16: 4: 6: 2.5, evenly mixing and stirring, and standing for 3.5 hours at 42 ℃ to obtain the curing agent.
A preparation method of a greening brick comprises the following steps:
1. preparing a base material: mixing and stirring desert sand grains, bentonite, zeolite powder, modified borax, a reinforcing agent, activated carbon and nano boron nitride powder uniformly, and then carrying out ultrasonic oscillation, wherein the frequency of the ultrasonic oscillation is controlled to be 40kHz, the time of the ultrasonic oscillation is 1.2h, and the base material is obtained after the ultrasonic oscillation is finished;
2. preparing an additive: mixing humectant, gelatinizer, and solidifying agent, stirring, and treating with ultraviolet rays at wavelength of 220nm for 25min to obtain additive;
3. preparing a mixture: adding the additive into the base material, and fully mixing and stirring uniformly to obtain a mixture;
4. pressing: putting the mixture into a die, pressing at the pressure of 6MPa for 4min to obtain a primary greening brick after pressing;
5. low-temperature plasma treatment: placing the primary greening brick in low-temperature plasma treatment equipment for low-temperature plasma treatment, controlling the treatment temperature to be 10 ℃, the treatment power to be 280W and the treatment time to be 6min, and obtaining the greening brick subjected to low-temperature plasma treatment;
6. microwave irradiation treatment: performing microwave irradiation on the primary greening brick subjected to low-temperature plasma treatment, controlling the power of the microwave irradiation to be 550W, controlling the temperature of the microwave irradiation to be 55 ℃, and controlling the time of the microwave irradiation to be 6min to obtain the primary greening brick subjected to microwave irradiation treatment;
7. and (5) maintenance: and (3) maintaining the primary greening brick subjected to the microwave irradiation treatment for 4 days in an environment with the temperature of 55 ℃ to obtain the greening brick.
Example 3
The greening brick comprises the following components in parts by weight: 120 parts of desert sand grains, 40 parts of bentonite, 35 parts of zeolite powder, 15 parts of modified borax, 8 parts of humectant, 7 parts of gelling agent, 6 parts of reinforcing agent, 5 parts of active carbon, 2 parts of curing agent and 1 part of nano boron nitride powder.
The particle size of the nanometer boron nitride powder is 80 nm.
The preparation method of the modified borax comprises the following steps: placing borax in a ball mill for ball milling, and controlling the ball-to-material ratio in the ball milling process to be 25: 1, the rotating speed of a ball mill is 350rpm, the ball milling time is 1.5h, borax powder is obtained after the ball milling is finished, and then the borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water are mixed according to the mass ratio of 12: 20: 4: 2: 40, stirring for 1.5h at the temperature of 45 ℃, controlling the stirring speed to be 200rpm, obtaining the borax liquid after the stirring is finished, and drying the borax liquid for 2h at the temperature of 150 ℃ to obtain the modified borax.
The preparation method of the humectant comprises the following steps: mixing trehalose, sodium alginate, anionic polyacrylamide and sodium pyrophosphate in a mass ratio of 25: 15: 10: 15 and mixing and stirring uniformly to obtain the humectant.
The molecular weight of the anionic polyacrylamide is 1200 ten thousand, and the charge density is 40 mol%.
The preparation method of the gelling agent comprises the following steps: mixing xanthan gum, sodium chloride, calcium chloride, chitosan and polyvinyl alcohol 1788 in a mass ratio of 35: 5: 5: 12: 10 mixing and stirring uniformly to obtain a primary gelling agent, carrying out microwave oscillation on the primary gelling agent for 15min, controlling the microwave intensity to be 150W, and finishing the microwave oscillation to obtain the gelling agent.
The preparation method of the reinforcing agent comprises the following steps: mixing calcium carbonate, magnesium carbonate, nano silicon dioxide and sodium sulfate in a mass ratio of 25: 5: 5: 2 mixing and stirring uniformly to obtain the reinforcing agent.
The preparation method of the curing agent comprises the following steps: pre-gelatinized starch, magnesium hexafluorosilicate hexahydrate, sodium citrate, yellow dextrin and aluminum chloride in a mass ratio of 10: 18: 5: 7: 3, mixing and stirring uniformly, and standing for 4 hours at the temperature of 45 ℃ to obtain the curing agent.
A preparation method of a greening brick comprises the following steps:
1. preparing a base material: mixing and stirring desert sand grains, bentonite, zeolite powder, modified borax, a reinforcing agent, activated carbon and nano boron nitride powder uniformly, and then carrying out ultrasonic oscillation, wherein the frequency of the ultrasonic oscillation is controlled to be 50kHz, the time of the ultrasonic oscillation is 1.5h, and the base material is obtained after the ultrasonic oscillation is finished;
2. preparing an additive: mixing humectant, gelatinizer, and solidifying agent, stirring, and treating with ultraviolet ray at wavelength of 250nm for 30min to obtain additive;
3. preparing a mixture: adding the additive into the base material, and fully mixing and stirring uniformly to obtain a mixture;
4. pressing: putting the mixture into a die, pressing at the pressure of 8MPa for 5min to obtain a primary greening brick after pressing;
5. low-temperature plasma treatment: placing the primary greening brick in low-temperature plasma treatment equipment for low-temperature plasma treatment, controlling the treatment temperature to be 12 ℃, the treatment power to be 300W and the treatment time to be 7min, and obtaining the greening brick subjected to low-temperature plasma treatment;
6. microwave irradiation treatment: performing microwave irradiation on the primary greening brick subjected to low-temperature plasma treatment, controlling the power of the microwave irradiation to be 600W, controlling the temperature of the microwave irradiation to be 60 ℃, and controlling the time of the microwave irradiation to be 7min to obtain the primary greening brick subjected to microwave irradiation treatment;
7. and (5) maintenance: and (3) maintaining the primary greening brick subjected to the microwave irradiation treatment for 5 days in an environment with the temperature of 60 ℃ to obtain the greening brick.
Comparative example 1
The composition and preparation method of the greening brick described in embodiment 1 are adopted, and the differences are as follows: the composition of the greening brick and the preparation of the greening brick adopt borax to replace modified borax.
Comparative example 2
The composition and preparation method of the greening brick described in embodiment 1 are adopted, and the differences are as follows: the components of the greening brick do not contain a humectant, namely, the humectant is not added in the step 2 in the preparation of the greening brick.
Comparative example 3
The composition and preparation method of the greening brick described in embodiment 1 are adopted, and the differences are as follows: in the step 2 of the preparation of the greening brick, ultraviolet treatment is not carried out, namely, the humectant, the gelatinizing agent and the curing agent are mixed and stirred uniformly to obtain the additive.
Comparative example 4
The composition and preparation method of the greening brick described in embodiment 1 are adopted, and the differences are as follows: the 5 th step of low-temperature plasma treatment is omitted in the preparation of the greening brick.
The green bricks prepared in examples 1-3 and comparative examples 1-4 were tested for compressive strength, breaking strength and thermal shock resistance, and the test results were as follows:
the greening bricks prepared in examples 1-3 and comparative examples 1-4 were tested for apparent porosity and air permeability, and the test results were as follows:
the water retention capacity of the greening bricks prepared in examples 1 to 3 and comparative examples 1 to 4 was tested by the following method: preparing 7 identical open desert test boxes with LED lamps, controlling the weight of sand in each desert test box to be identical, controlling the water content of the sand to be 15%, respectively covering the desert test boxes with the greening bricks prepared in examples 1-3 and comparative examples 1-4, controlling the temperature of each desert test box to be 50 ℃, and controlling the red-blue light ratio of the LED lamps of each desert test box to be 9: 1, the illumination intensity is 600 mu mol/(m)2S), after continuously irradiating for 18h, testing the water content of the sand in each desert test box, wherein the test results are as follows:
all percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A preparation method of a greening brick is characterized by sequentially comprising the steps of preparing a base material, preparing an additive, preparing a mixture, pressing the mixture to obtain a pressed primary greening brick, carrying out low-temperature plasma treatment, carrying out microwave irradiation treatment and maintaining;
the preparation method comprises the steps of preparing a base material, mixing and stirring desert sand grains, bentonite, zeolite powder, modified borax, a reinforcing agent, activated carbon and nano boron nitride powder uniformly, and then carrying out ultrasonic oscillation, wherein the frequency of the ultrasonic oscillation is controlled to be 30-50kHz, the time of the ultrasonic oscillation is 1-1.5 hours, and the base material is obtained after the ultrasonic oscillation is finished;
the preparation method of the modified borax comprises the steps of placing borax in a ball mill for ball milling, obtaining borax powder after the ball milling is finished, then mixing the borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water, stirring at the temperature of 40-45 ℃, obtaining borax liquid after the stirring is finished, and drying the borax liquid at the temperature of 140-150 ℃ for 1.5-2 hours to obtain the modified borax;
in the preparation of the modified borax, the mass ratio of borax powder, sodium dodecyl benzene sulfonate, poly dimethyl diallyl ammonium chloride, acetic acid and deionized water is 10-12: 15-20: 3-4: 1-2: 30-40 parts of;
the preparation of the additive comprises the steps of mixing and stirring the humectant, the gelling agent and the curing agent uniformly, and then carrying out ultraviolet treatment, wherein the wavelength of the ultraviolet treatment is controlled to be 200-250nm, and the time of the ultraviolet treatment is 20-30min, so as to obtain the additive;
the preparation method of the humectant comprises the steps of mixing and uniformly stirring trehalose, sodium alginate, anionic polyacrylamide and sodium pyrophosphate to obtain the humectant;
in the preparation of the humectant, the mass ratio of trehalose to sodium alginate to anionic polyacrylamide to sodium pyrophosphate is (20-25): 10-15: 6-10: 12-15;
the preparation method comprises the steps of preparing a mixture, adding an additive into a base material, and fully mixing and uniformly stirring to obtain a mixture;
and the low-temperature plasma treatment is to place the pressed primary greening brick in low-temperature plasma treatment equipment for low-temperature plasma treatment, wherein the treatment temperature is 8-12 ℃, the treatment power is 250-300W, and the treatment time is 5-7 min.
2. The method for preparing the greening brick as claimed in claim 1, wherein the microwave irradiation treatment is carried out by subjecting the greening brick after the low-temperature plasma treatment to microwave irradiation, and the primary greening brick after the microwave irradiation treatment is obtained after the microwave irradiation treatment is finished.
3. The method for preparing the greening brick as claimed in claim 1, wherein the maintaining step is carried out by maintaining the primary greening brick after the microwave irradiation treatment at 50-60 ℃ for 3-5 days to obtain the greening brick.
4. The greening brick prepared by the preparation method of claim 1, which comprises the following components in parts by weight: 100 portions of desert sand grains, 35 to 40 portions of bentonite, 30 to 35 portions of zeolite powder, 10 to 15 portions of modified borax, 5 to 8 portions of humectant, 5 to 7 portions of gelling agent, 4 to 6 portions of reinforcing agent, 3 to 5 portions of active carbon, 1 to 2 portions of curing agent and 0.5 to 1 portion of nano boron nitride powder.
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| CN1966861B (en) * | 2006-09-30 | 2012-03-28 | 北京仁创科技集团有限公司 | Composite water permeable brick |
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| CN101386503A (en) * | 2008-10-28 | 2009-03-18 | 海南大学 | Desert greening brick prepared by inorganic gelation |
| CN101497520A (en) * | 2009-03-06 | 2009-08-05 | 天津师范大学 | Preparation of core type greening brick |
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