CN111943621A - Fireproof flame-retardant thermal-insulation mortar and preparation method thereof - Google Patents
Fireproof flame-retardant thermal-insulation mortar and preparation method thereof Download PDFInfo
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- CN111943621A CN111943621A CN202010760547.7A CN202010760547A CN111943621A CN 111943621 A CN111943621 A CN 111943621A CN 202010760547 A CN202010760547 A CN 202010760547A CN 111943621 A CN111943621 A CN 111943621A
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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
- C04B28/14—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 containing calcium sulfate 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2092—Resistance against biological degradation
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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
-
- 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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Fireproofing Substances (AREA)
Abstract
The invention discloses fireproof flame-retardant thermal insulation mortar which is formed by uniformly mixing a solid material and a liquid material according to the weight ratio of 1: 3.5-4.5; the invention also discloses a preparation method of the fireproof flame-retardant heat-preservation mortar, in the preparation process of the modified lignocellulose, methyl is introduced to the surface of the etherified lignocellulose, so that the surface of the lignocellulose has good surface activity, the mixing and dispersing effects of the lignocellulose in the mortar are improved, meanwhile, the modified lignocellulose has good thickening and film-forming properties, in addition, when the mortar is prepared, the modified lignocellulose can play a role in improving the crack resistance of the dried mortar, on the other hand, gel liquid formed by the modified lignocellulose can play a role in water retention, and meanwhile, the modified lignocellulose gel coated on the surface of the hollow glass microspheres can improve the mixing and connecting effects of the hollow glass microspheres and other components such as cement in the mortar.
Description
Technical Field
The invention belongs to the technical field of environment-friendly building materials, and particularly relates to fireproof flame-retardant thermal-insulation mortar and a preparation method thereof.
Background
The mortar is a bonding substance used for building bricks on buildings, is formed by adding water into sand and cementing materials according to a certain proportion, is also called mortar and also used as mortar, and is commonly used as cement mortar, mixed mortar (or cement lime mortar), lime mortar and clay mortar.
Along with the progress of society and the development of scientific technology, the building quality is required to be higher, as an important component of a building structure, the function of mortar can bring remarkable influence on the safety of the building, and the building safety problem and the building heat insulation problem are two important parameters of modern buildings, wherein the main source of the building safety is the fire problem, so that the use of fireproof and high-temperature-resistant building materials is an important means for improving the fireproof performance of the building, the heat insulation performance of an outer wall of the building is improved, the heat exchange between the inside and the outside of the building can be reduced, the energy utilization efficiency of refrigeration and heating in the building is improved, and in order to solve the problems, the heat insulation mortar capable of achieving the fireproof and flame-retardant effects is provided.
Disclosure of Invention
The invention aims to provide fireproof flame-retardant thermal-insulation mortar and a preparation method thereof.
The technical problems to be solved by the invention are as follows:
along with the progress of society and the development of scientific technology, the building quality is required to be higher, as an important component of a building structure, the function of mortar can bring remarkable influence on the safety of the building, the building safety problem and the building heat insulation problem are two important parameters of modern buildings, wherein the main source of the building safety is the fire problem, so that the use of fireproof and high-temperature-resistant building materials is an important means for improving the fireproof performance of the building, and how to improve the heat insulation performance of an outer wall of the building and reduce the heat exchange between the inside and the outside of the building so as to improve the energy utilization efficiency of refrigeration and heating in the building is one of the problems to be solved at present.
The purpose of the invention can be realized by the following technical scheme:
the fireproof flame-retardant thermal-insulation mortar is prepared by uniformly mixing a solid material and a liquid material according to the weight ratio of 1: 3.5-4.5;
the solid material comprises the following raw materials in parts by weight: 200-350 parts of Portland cement, 15-30 parts of gypsum powder, 1-4 parts of modified lignocellulose, 300-500 parts of fine sand, 40-100 parts of hollow glass beads, 1-20 parts of cement foaming agent and 1-10 parts of water-retaining agent;
the liquid material comprises the following raw materials in parts by weight: 200-300 parts of deionized water, 1-5 parts of bactericide, 1-5 parts of dispersant and 200-400 parts of acrylate emulsion;
the dispersant is a fatty acid internal dispersant, a paraffin dispersant or a metal soap dispersant;
the cement foaming agent is prepared by uniformly mixing sodium chloride, sodium thiosulfate, ammonium chloride, nekal, aluminum powder and iron powder according to the weight ratio of 1:1.5:1.2:0.5:3: 90;
the water reducing agent is a polycarboxylic acid or naphthalene water reducing agent;
the fine sand has more than 85% of particles with the particle size of more than 0.075mm, and the average particle size of 0.125mm-0.25 mm;
the preparation method of the fireproof flame-retardant thermal-insulation mortar comprises the following steps:
firstly, preparing raw materials according to the weight ratio, adding deionized water into a container, stirring, then adding acrylate emulsion, a bactericide and a dispersing agent, and uniformly mixing and stirring to obtain a liquid material;
secondly, weighing the raw materials in the solid material according to the weight ratio for later use, cleaning and drying the hollow glass microspheres, adding the hollow glass microspheres into a sodium hydroxide solution with the mass concentration of 4%, soaking for 2-3h, filtering, washing with deionized water, and drying for later use;
thirdly, taking the liquid material prepared in the previous step, and adding modified lignocellulose into the liquid material, wherein the ratio of the modified lignocellulose to the liquid material is 1kg-2 kg: 10L, adding hollow glass beads after uniformly mixing and stirring, performing ultrasonic dispersion, and performing heating reaction at the temperature of 55-75 ℃ to uniformly mix and disperse the modified lignocellulose and the hollow glass beads, so that the surfaces of the hollow glass beads are coated with a layer of colloidal liquid of the modified lignocellulose;
fourthly, adding the residual solid materials into a mixing and stirring device for uniform mixing and stirring to obtain a solid mixture;
and fifthly, uniformly mixing the solid mixture and the liquid material according to the weight ratio, and adding the mixture of the modified lignocellulose and the hollow glass beads into the mixture to obtain the fireproof flame-retardant heat-preservation mortar.
In the step, on one hand, the modified lignocellulose can improve the crack resistance of the dried mortar, on the other hand, the gel liquid formed by the modified lignocellulose can achieve the water retention effect, and meanwhile, the modified lignocellulose gel coated on the surfaces of the hollow glass beads can improve the mixing and connecting effects of the hollow glass beads and other components such as cement in the mortar;
the preparation method of the modified lignocellulose comprises the following steps:
s1, preparing a sodium hydroxide aqueous solution with the mass concentration of 16% -18%, heating the sodium hydroxide aqueous solution to 45-50 ℃, adding lignocellulose into the sodium hydroxide aqueous solution, stirring and dispersing, soaking for 15-25min, filtering, washing with deionized water to be neutral, and drying at the temperature of 80-100 ℃;
s2, adding the lignocellulose obtained by the previous step into 85% ethanol water solution with volume concentration, uniformly stirring, adding sodium hydroxide into the ethanol water solution, adjusting the mass concentration of the sodium hydroxide to be 8% -15%, and carrying out etherification reaction at the temperature of 30 ℃ for 1-1.5h to obtain a lignocellulose modified intermediate;
s3, preparing 20-24% chloroacetic acid ethanol water solution, wherein the volume ratio of ethanol to water in the chloroacetic acid ethanol water solution is 17:3, adding the prepared chloroacetic acid ethanol water solution into the lignocellulose modified intermediate obtained by the previous step, adding the lignocellulose modified intermediate into the chloroacetic acid ethanol water solution, uniformly mixing and stirring, reacting at 70 ℃ for 2-3h, and adding hydrochloric acid into the reaction product after the reaction is finished to adjust the pH to 7-7.5;
s4, filtering and separating the product obtained in the last step, washing the separated solid-phase product for 2-5 times by using an ethanol water solution with the volume concentration of 35% -85%, filtering and separating, and drying the solid-phase product at the temperature of 80-95 ℃ to obtain the modified lignocellulose;
in the preparation process of the modified lignocellulose, methyl is introduced to the surface of the etherified lignocellulose, so that the surface of the lignocellulose has good surface activity, the mixing and dispersing effects of the lignocellulose in mortar are improved, and the modified lignocellulose has good thickening and film-forming properties.
The invention has the beneficial effects that:
in the preparation process of the modified lignocellulose, methyl is introduced to the surface of the etherified lignocellulose, so that the surface of the lignocellulose has good surface activity, the mixing and dispersing effects of the lignocellulose in mortar are improved, meanwhile, the modified lignocellulose has good thickening and film-forming properties, in addition, when the mortar is prepared, the modified lignocellulose can play a role in improving the crack resistance of the dried mortar on one hand, on the other hand, gel liquid formed by the modified lignocellulose can play a role in water retention, and meanwhile, the modified lignocellulose gel coated on the surface of the hollow glass microsphere can improve the mixing and connecting effects of the hollow glass microsphere and other components such as cement in the mortar, so that the heat preservation and protection effects of the hollow glass microsphere can be improved, and the bonding effect of the mortar cannot be obviously reduced, meanwhile, the modified lignocellulose with good water retention property can play a good flame-retardant cooling effect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The fireproof flame-retardant thermal-insulation mortar is prepared by uniformly mixing a solid material and a liquid material according to the weight ratio of 1: 4;
the solid material comprises the following raw materials in parts by weight: 250 parts of Portland cement, 20 parts of gypsum powder, 3 parts of modified lignocellulose, 350 parts of fine sand, 50 parts of hollow glass beads, 4 parts of cement foaming agent and 2 parts of water-retaining agent;
the liquid material comprises the following raw materials in parts by weight: 250 parts of deionized water, 4 parts of bactericide, 5 parts of dispersant and 300 parts of acrylate emulsion;
the dispersant is a fatty acid internal dispersant;
the cement foaming agent is prepared by uniformly mixing sodium chloride, sodium thiosulfate, ammonium chloride, nekal, aluminum powder and iron powder according to the weight ratio of 1:1.5:1.2:0.5:3: 90;
the water reducing agent is polycarboxylic acid;
the fine sand has more than 85% of particles with the particle size of more than 0.075mm, and the average particle size of 0.125mm-0.25 mm;
the preparation method of the fireproof flame-retardant thermal-insulation mortar comprises the following steps:
firstly, preparing raw materials according to the weight ratio, adding deionized water into a container, stirring, then adding acrylate emulsion, a bactericide and a dispersing agent, and uniformly mixing and stirring to obtain a liquid material;
secondly, weighing the raw materials in the solid material according to the weight ratio for later use, washing and drying the hollow glass microspheres, adding the washed and dried hollow glass microspheres into a sodium hydroxide solution with the mass concentration of 4%, soaking for 2 hours, filtering, washing with deionized water, and drying for later use;
thirdly, taking the liquid material prepared in the previous step, and adding modified lignocellulose into the liquid material, wherein the ratio of the modified lignocellulose to the liquid material is 1.5 kg: 10L, adding hollow glass beads after uniformly mixing and stirring, performing ultrasonic dispersion, and performing heating reaction at the temperature of 70 ℃ to uniformly mix and disperse the modified lignocellulose and the hollow glass beads, so that the surfaces of the hollow glass beads are coated with a layer of colloidal liquid of the modified lignocellulose;
fourthly, adding the residual solid materials into a mixing and stirring device for uniform mixing and stirring to obtain a solid mixture;
and fifthly, uniformly mixing the solid mixture and the liquid material according to the weight ratio, and adding the mixture of the modified lignocellulose and the hollow glass beads into the mixture to obtain the fireproof flame-retardant heat-preservation mortar.
The preparation method of the modified lignocellulose comprises the following steps:
s1, preparing a sodium hydroxide aqueous solution with the mass concentration of 18%, heating the sodium hydroxide aqueous solution to 50 ℃, adding lignocellulose into the sodium hydroxide aqueous solution, stirring and dispersing, soaking for 20min, filtering, washing with deionized water to be neutral, and drying at the temperature of 80 ℃;
s2, adding the lignocellulose obtained by the previous step into 85% ethanol water solution with volume concentration, uniformly stirring, adding sodium hydroxide, adjusting the mass concentration of the sodium hydroxide to be 8%, and carrying out etherification reaction at the temperature of 30 ℃ for 1.5h to obtain a lignocellulose modified intermediate;
s3, preparing an ethanol water solution of chloroacetic acid with the mass concentration of 24%, wherein the volume ratio of ethanol to water in the ethanol water solution of chloroacetic acid is 17:3, adding the prepared ethanol water solution of chloroacetic acid into the lignocellulose modified intermediate obtained by the previous step, adding the lignocellulose modified intermediate into the ethanol water solution of chloroacetic acid, uniformly mixing and stirring, reacting at the temperature of 70 ℃ for 2.5 hours, and after the reaction is finished, dropwise adding hydrochloric acid into a reaction product to adjust the pH value to 7-7.5;
s4, filtering and separating the product obtained in the last step, washing the solid-phase product obtained by separation for 2 times by using an ethanol water solution with the volume concentration of 35-85%, filtering and separating, and drying the solid-phase product at the temperature of 90 ℃ to obtain the modified lignocellulose.
Example 2
The fireproof flame-retardant thermal-insulation mortar is prepared by uniformly mixing a solid material and a liquid material according to the weight ratio of 1: 4;
the solid material comprises the following raw materials in parts by weight: 300 parts of Portland cement, 20 parts of gypsum powder, 4 parts of modified lignocellulose, 400 parts of fine sand, 60 parts of hollow glass beads, 6 parts of cement foaming agent and 6 parts of water-retaining agent;
the liquid material comprises the following raw materials in parts by weight: 200 parts of deionized water, 4 parts of bactericide, 4 parts of dispersant and 300 parts of acrylate emulsion;
the dispersant is a fatty acid internal dispersant;
the cement foaming agent is prepared by uniformly mixing sodium chloride, sodium thiosulfate, ammonium chloride, nekal, aluminum powder and iron powder according to the weight ratio of 1:1.5:1.2:0.5:3: 90;
the water reducing agent is polycarboxylic acid;
the fine sand has more than 85% of particles with the particle size of more than 0.075mm, and the average particle size of 0.125mm-0.25 mm;
the preparation method of the fireproof flame-retardant thermal-insulation mortar comprises the following steps:
firstly, preparing raw materials according to the weight ratio, adding deionized water into a container, stirring, then adding acrylate emulsion, a bactericide and a dispersing agent, and uniformly mixing and stirring to obtain a liquid material;
secondly, weighing the raw materials in the solid material according to the weight ratio for later use, washing and drying the hollow glass microspheres, adding the washed and dried hollow glass microspheres into a sodium hydroxide solution with the mass concentration of 4%, soaking for 2 hours, filtering, washing with deionized water, and drying for later use;
thirdly, taking the liquid material prepared in the previous step, and adding modified lignocellulose into the liquid material, wherein the ratio of the modified lignocellulose to the liquid material is 2 kg: 10L, adding hollow glass beads after uniformly mixing and stirring, performing ultrasonic dispersion, and performing heating reaction at the temperature of 70 ℃ to uniformly mix and disperse the modified lignocellulose and the hollow glass beads, so that the surfaces of the hollow glass beads are coated with a layer of colloidal liquid of the modified lignocellulose;
fourthly, adding the residual solid materials into a mixing and stirring device for uniform mixing and stirring to obtain a solid mixture;
and fifthly, uniformly mixing the solid mixture and the liquid material according to the weight ratio, and adding the mixture of the modified lignocellulose and the hollow glass beads into the mixture to obtain the fireproof flame-retardant heat-preservation mortar.
The preparation method of the modified lignocellulose comprises the following steps:
s1, preparing a sodium hydroxide aqueous solution with the mass concentration of 16%, heating the sodium hydroxide aqueous solution to 50 ℃, adding lignocellulose into the sodium hydroxide aqueous solution, stirring and dispersing, soaking for 20min, filtering, washing with deionized water to be neutral, and drying at the temperature of 90 ℃;
s2, adding the lignocellulose obtained by the previous step into 85% ethanol water solution with volume concentration, uniformly stirring, adding sodium hydroxide into the ethanol water solution, adjusting the mass concentration of the sodium hydroxide to be 12%, and carrying out etherification reaction at the temperature of 30 ℃ for 1.5h to obtain a lignocellulose modified intermediate;
s3, preparing an ethanol water solution of chloroacetic acid with the mass concentration of 24%, wherein the volume ratio of ethanol to water in the ethanol water solution of chloroacetic acid is 17:3, adding the prepared ethanol water solution of chloroacetic acid into the lignocellulose modified intermediate obtained by the previous step, adding the lignocellulose modified intermediate into the ethanol water solution of chloroacetic acid, uniformly mixing and stirring, reacting at the temperature of 70 ℃ for 3 hours, and after the reaction is finished, dropwise adding hydrochloric acid into a reaction product to adjust the pH value to 7-7.5;
s4, filtering and separating the product obtained in the last step, washing the solid-phase product obtained by separation for 2 times by using an ethanol water solution with the volume concentration of 35-85%, filtering and separating, and drying the solid-phase product at the temperature of 85 ℃ to obtain the modified lignocellulose.
Analysis of Experimental data and results
The fire resistance (GB8624-2006), the heat preservation performance and the compressive strength of the mortars prepared in the examples 1 and 2 are detected, and the specific results are shown in a table 1:
TABLE 1
| Detecting items | Fire resistance | Coefficient of thermal conductivity | Compressive strength |
| Example 1 | A2 | ≤0.06W/(M.K) | 2MPA |
| Example 2 | A2 | ≤0.065W/(M.K) | 1.8MPA |
From the results, the fireproof thermal insulation mortar disclosed by the invention has good fire resistance and thermal insulation performance and also has good compressive strength.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (7)
1. The fireproof flame-retardant thermal insulation mortar is characterized by being prepared by uniformly mixing a solid material and a liquid material according to the weight ratio of 1: 3.5-4.5;
the solid material comprises the following raw materials in parts by weight: 200-350 parts of Portland cement, 15-30 parts of gypsum powder, 1-4 parts of modified lignocellulose, 300-500 parts of fine sand, 40-100 parts of hollow glass beads, 1-20 parts of cement foaming agent and 1-10 parts of water-retaining agent;
the liquid material comprises the following raw materials in parts by weight: 200-300 parts of deionized water, 1-5 parts of bactericide, 1-5 parts of dispersant and 200-400 parts of acrylate emulsion.
2. The fire-proof flame-retardant thermal mortar according to claim 1, wherein the dispersant is a fatty acid internal dispersant, a paraffin wax dispersant or a metal soap dispersant.
3. The fireproof flame-retardant thermal insulation mortar of claim 1, wherein the cement foaming agent is prepared by uniformly mixing sodium chloride, sodium thiosulfate, ammonium chloride, nekal, aluminum powder and iron powder according to a weight ratio of 1:1.5:1.2:0.5:3: 90.
4. The fireproof flame-retardant thermal mortar of claim 1, wherein the water reducing agent is a polycarboxylic acid or naphthalene water reducing agent.
5. The fire-proof and flame-retardant thermal mortar as claimed in claim 1, wherein the fine sand contains more than 85% of particles with a particle size of 0.075mm and an average particle size of 0.125-0.25 mm.
6. The preparation method of the fireproof flame-retardant thermal insulation mortar according to claim 1, which is characterized by comprising the following steps:
firstly, preparing raw materials according to the weight ratio, adding deionized water into a container, stirring, then adding acrylate emulsion, a bactericide and a dispersing agent, and uniformly mixing and stirring to obtain a liquid material;
secondly, weighing the raw materials in the solid material according to the weight ratio for later use, cleaning and drying the hollow glass microspheres, adding the hollow glass microspheres into a sodium hydroxide solution with the mass concentration of 4%, soaking for 2-3h, filtering, washing with deionized water, and drying for later use;
thirdly, taking the liquid material prepared in the previous step, and adding modified lignocellulose into the liquid material, wherein the ratio of the modified lignocellulose to the liquid material is 1kg-2 kg: 10L, adding hollow glass beads after uniformly mixing and stirring, performing ultrasonic dispersion, and performing heating reaction at the temperature of 55-75 ℃ to uniformly mix and disperse the modified lignocellulose and the hollow glass beads, so that the surfaces of the hollow glass beads are coated with a layer of colloidal liquid of the modified lignocellulose;
fourthly, adding the residual solid materials into a mixing and stirring device for uniform mixing and stirring to obtain a solid mixture;
and fifthly, uniformly mixing the solid mixture and the liquid material according to the weight ratio, and adding the mixture of the modified lignocellulose and the hollow glass beads into the mixture to obtain the fireproof flame-retardant heat-preservation mortar.
7. The preparation method of the fireproof flame-retardant thermal mortar according to claim 6, wherein the preparation method of the modified lignocellulose is as follows:
s1, preparing a sodium hydroxide aqueous solution with the mass concentration of 16% -18%, heating the sodium hydroxide aqueous solution to 45-50 ℃, adding lignocellulose into the sodium hydroxide aqueous solution, stirring and dispersing, soaking for 15-25min, filtering, washing with deionized water to be neutral, and drying at the temperature of 80-100 ℃;
s2, adding the lignocellulose obtained by the previous step into 85% ethanol water solution with volume concentration, uniformly stirring, adding sodium hydroxide into the ethanol water solution, adjusting the mass concentration of the sodium hydroxide to be 8% -15%, and carrying out etherification reaction at the temperature of 30 ℃ for 1-1.5h to obtain a lignocellulose modified intermediate;
s3, preparing 20-24% chloroacetic acid ethanol water solution, wherein the volume ratio of ethanol to water in the chloroacetic acid ethanol water solution is 17:3, adding the prepared chloroacetic acid ethanol water solution into the lignocellulose modified intermediate obtained by the previous step, adding the lignocellulose modified intermediate into the chloroacetic acid ethanol water solution, uniformly mixing and stirring, reacting at 70 ℃ for 2-3h, and adding hydrochloric acid into the reaction product after the reaction is finished to adjust the pH to 7-7.5;
s4, filtering and separating the product obtained in the last step, washing the solid-phase product obtained by separation for 2-5 times by using an ethanol water solution with the volume concentration of 35% -85%, filtering and separating, and drying the solid-phase product at the temperature of 80-95 ℃ to obtain the modified lignocellulose.
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| CN115678490A (en) * | 2022-09-09 | 2023-02-03 | 宁波聚力新材料科技有限公司 | Low-specific-gravity low-corrosion coated silica gel and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115678490A (en) * | 2022-09-09 | 2023-02-03 | 宁波聚力新材料科技有限公司 | Low-specific-gravity low-corrosion coated silica gel and preparation method thereof |
| CN115678490B (en) * | 2022-09-09 | 2024-01-12 | 宁波聚力新材料科技有限公司 | Low-specific gravity low-corrosion coated silica gel and preparation method thereof |
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Application publication date: 20201117 |