CN113621258A - Fireproof flame-retardant ecological coating and preparation method thereof - Google Patents
Fireproof flame-retardant ecological coating and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/10—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances lime
- C09D1/12—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances lime with organic additives
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- C08F2/00—Processes of polymerisation
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- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
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- C08F2/00—Processes of polymerisation
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
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- C08K9/00—Use of pretreated ingredients
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a fireproof flame-retardant ecological coating and a preparation method thereof. The fireproof flame-retardant ecological coating is prepared from the raw materials of lime, kaolin, diatom ooze, biochar, titanium dioxide, pine oil, glycerol, a film-forming aid, a flame retardant, a binder and a flame-retardant emulsion. When in preparation, firstly, the kaolin and the diatom ooze are dispersed in water, and lime is added under the stirring condition to obtain a coating base material; adding the biochar, titanium dioxide, a film forming auxiliary agent and a flame retardant into the coating base material, and performing ultrasonic stirring to obtain a coating primary product; and adding the pine oil and the glycerol into the primary paint product, and stirring for 30-45 min to obtain the paint. The method has the advantages of simple process and low manufacturing cost, and the prepared coating is non-toxic to human bodies, green and environment-friendly, and has good fireproof and flame-retardant properties.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a fireproof flame-retardant ecological coating and a preparation method thereof.
Background
The existing paint is mainly divided into oil paint and water paint, and is applied to surface coating of walls, furniture and the like. The coating is usually prepared by mixing various binders and fillers, most of the base materials of the binders and the fillers are toxic and harmful chemical products, and particularly, the coating with the functions of corrosion prevention and mildew prevention needs to use chemical substances with higher toxicity to achieve the effect. The paint can release toxic and harmful components in the production and use processes, and can cause harm to human bodies. Meanwhile, the coating in the prior art is unstable in a high-temperature environment, has poor fireproof and flame-retardant properties and cannot play a flame-retardant role.
Disclosure of Invention
Aiming at the prior art, the invention provides the fireproof flame-retardant ecological coating which is harmless to human bodies, green and environment-friendly, simple in process, low in manufacturing cost and good in high-temperature stability.
In order to achieve the purpose, the invention adopts the technical scheme that: the fireproof flame-retardant ecological coating is prepared from the following raw materials in parts by mass:
100-120 parts of lime, 80-100 parts of kaolin, 20-40 parts of diatom ooze, 20-40 parts of biochar, 10-20 parts of titanium dioxide, 10-20 parts of pine oil, 5-15 parts of glycerol, 5-15 parts of a film forming additive, 5-15 parts of a flame retardant, 20-40 parts of a binder, 10-20 parts of a flame retardant emulsion and 650-750 parts of water.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the fireproof flame-retardant ecological coating is prepared from the following raw materials in parts by mass:
110 parts of lime, 90 parts of kaolin, 30 parts of diatom ooze, 30 parts of biochar, 15 parts of titanium dioxide, 15 parts of pine oil, 10 parts of glycerol, 10 parts of a film-forming aid, 10 parts of a flame retardant, 30 parts of a binder, 15 parts of a flame-retardant emulsion and 700 parts of water.
The fireproof flame-retardant ecological coating is prepared from a plurality of raw materials. The kaolin is fine and smooth in texture, can improve the thixotropy and the leveling property of the coating by taking the kaolin as a main raw material of the coating, and has better uniformity and stability of a film layer formed after being coated; and the kaolin has excellent plasticity and fire resistance, and is also greatly helpful for improving the fire resistance of the coating.
The diatom ooze in the preparation raw materials has a porous structure and can adsorb substances harmful to human bodies in the air, and the diatom ooze can also absorb moisture in the air, so that the moisture exists in the coating film in a form of bound water, and the fireproof performance of the coating film is further improved.
The biochar in the raw materials is a porous active substance, harmful substances in the air can be adsorbed together with diatom ooze, liquid materials can be adsorbed into the air, a combined body with a more stable structure is formed, and the storage stability and the fireproof performance of the coating can be remarkably improved by the combined body.
The flame-retardant emulsion in the raw materials can play a better flame-retardant role while improving the film-forming property of the coating.
The pine oil and the glycerol in the raw materials for preparation can improve the mechanical property of the coating film, prevent the film formed by the coating from cracking at high temperature, and have better fireproof and flame-retardant properties.
The flame retardant in the preparation raw materials and the rest components endow the coating with fireproof performance.
Furthermore, solid materials in the preparation raw materials exist in a powder form, and the particle size of the powder is 40-60 mu m.
Further, the flame-retardant emulsion is prepared by the following steps:
(1) mixing an emulsifier, modified nano-silica and water, and stirring at 65-70 ℃ for 10-20 min to obtain an emulsion; the emulsifier is formed by mixing sodium dodecyl sulfate, AEO-9 and isomeric tridecanol polyoxyethylene ether according to the mass ratio of 3:2: 1;
(2) dissolving potassium persulfate in the emulsion to form an initiator solution;
(3) uniformly mixing methyl methacrylate, butyl acrylate, styrene, diethyl vinylphosphonate and double-end vinyl silicone oil according to the mass ratio of 24:72:20:21:16 to obtain a reactant;
(4) adding 20 wt% of reactants into a reaction kettle, stirring for 30min at room temperature, then heating to 80-85 ℃, adding 1/3 initiator solution, and keeping the temperature for reaction for 30 min;
(5) dropwise adding the rest reactant and the initiator solution into the reaction kettle in 3-4 h, and continuing to perform heat preservation reaction for 1h after dropwise adding is finished; then cooling to below 40 ℃ to obtain the flame-retardant emulsion.
Further, the structural formula of the double-end-capped vinyl silicone oil is as follows:
CH2＝CH-Si(CH3)2O[(CH3)2SiO]n(CH3)2Si-CH＝CH2its molecular weight is about 1000.
Further, the modified nano-silica is prepared by the following steps:
dissolving a certain amount of emulsifier sodium dodecyl sulfate in deionized water, rapidly stirring for 15min, adding a certain amount of nano silicon dioxide under mechanical stirring, ultrasonically dispersing for 1h, transferring into a three-neck flask, dropwise adding a certain amount of silane coupling agent 3- (methacryloyloxy) propyl trimethoxysilane under stirring, heating to 75 ℃, stirring for reacting for 8h, cooling to obtain a modified nano silicon dioxide aqueous solution, centrifuging, and drying to obtain the modified nano silicon dioxide.
Further, the biochar is prepared by the following steps:
s1: mixing the traditional Chinese medicine residues with fermentation liquor according to a material-liquid ratio of 1g: 2-4 mL, carrying out closed fermentation at 35-40 ℃ for 12-24 h, then carrying out solid-liquid separation, collecting solids, and drying until the water content is lower than 5% to obtain a biomass raw material; the fermentation liquor is aqueous solution of cellulase and pectinase;
s2: crushing a biomass raw material into particles with the particle size of 200-500 mu m, then loading the particles into a carbonization device, introducing protective gas, heating to 280-320 ℃ at the heating rate of 20 ℃/min, carrying out heat preservation treatment for 30-45 min, heating to 580-600 ℃ at the heating rate of 10 ℃/min, carrying out heat preservation treatment for 2-4 h, and then air-cooling to room temperature to obtain a biochar primary product;
s3: dispersing the biochar primary product in 40-45 wt% sulfuric acid solution, stirring at a stirring speed of 45-60 rpm for 30-45 min, then carrying out solid-liquid separation, collecting solids, transferring the solids to an oven at the temperature of 180-220 ℃, baking for 1-2 h, then air cooling to room temperature, and then crushing into powder with the particle size of 40-60 mu m to obtain the biochar.
The biochar is prepared from the traditional Chinese medicine residues as raw materials, so that the traditional Chinese medicine residues can be recycled, and active substances in the Chinese herbal medicines can improve the comprehensive performance of the biochar, so that the obtained activated carbon has higher adsorption capacity on harmful substances.
Further, the concentrations of the cellulase and the pectinase in the fermentation liquor are respectively 1-2 g/mL and 0.5-1 g/mL.
Further, the flame retardant is formed by mixing aluminum hydroxide and magnesium hydroxide according to the mass ratio of 1: 1-3. .
Further, the film forming aid is ethylene glycol, propylene glycol or hexylene glycol.
Further, the binder is water glass.
The invention also discloses a preparation method of the fireproof flame-retardant ecological coating, which comprises the following steps:
s1: dispersing kaolin and diatom ooze in water, and then adding lime under the stirring condition to obtain a coating base material;
s2: adding the biochar, titanium dioxide, a film forming auxiliary agent and a flame retardant into a coating base material, and ultrasonically stirring for 30-60 min to obtain a coating primary product;
s3: and adding the pine oil and the glycerol into the primary paint, and stirring for 30-45 min to obtain the paint.
Wherein the stirring speed in the S1 and S3 is 45-60 rpm.
The invention has the beneficial effects that:
1. the coating disclosed by the invention contains numerous components, but does not contain harmful chemical components, all raw materials are ecotype, and diatom ooze and activated carbon in the components can adsorb harmful substances in the air, the moisture content can be adjusted and balanced, the coating is moisture-absorbing and breathable, automatic balance is realized, so that a building has respiratory property, and when water vapor is released into a wall body, the harmful substances in the wall body are hydrolyzed and oxidized and then separated out, and indoor and outdoor air is purified.
2. The coating film formed by the coating disclosed by the invention has good ageing resistance, good stability, no pulverization, no cracking and no fading, and meanwhile, the film has excellent high-temperature stability, is not easy to crack at high temperature and has good fireproof performance.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1
The fireproof flame-retardant ecological coating is prepared from the following raw materials in parts by mass:
110 parts of lime, 90 parts of kaolin, 30 parts of diatom ooze, 30 parts of biochar, 15 parts of titanium dioxide, 15 parts of pine oil, 10 parts of glycerol, 10 parts of a film-forming aid, 10 parts of a flame retardant, 30 parts of a binder, 15 parts of a flame-retardant emulsion and 700 parts of water. Wherein the film-forming assistant is glycol; the flame retardant is formed by mixing aluminum hydroxide and magnesium hydroxide according to the mass ratio of 1: 2; the binder is water glass.
The biochar is prepared by the following steps:
s1: mixing the residual traditional Chinese medicine residues after the heat-clearing and spleen-purging powder is decocted with fermentation liquor according to the material-liquid ratio of 1g to 3mL, carrying out closed fermentation for 18h at 37 ℃, then carrying out solid-liquid separation, collecting solids, and drying until the water content is lower than 5% to obtain a biomass raw material; the fermentation liquor is aqueous solution of cellulase and pectinase, and the concentrations of the cellulase and the pectinase in the fermentation liquor are 1g/mL and 0.5g/mL respectively;
s2: crushing a biomass raw material into particles with the particle size of 300 mu m, then filling the particles into an atmosphere box furnace, vacuumizing, introducing nitrogen, heating to 300 ℃ at the heating rate of 20 ℃/min, carrying out heat preservation treatment for 40min, heating to 600 ℃ at the heating rate of 10 ℃/min, carrying out heat preservation treatment for 3h, and then air-cooling to room temperature to obtain a biochar primary product;
s3: dispersing the biochar primary product in 40 wt% sulfuric acid solution, stirring at a stirring speed of 60rpm for 30min, then carrying out solid-liquid separation, collecting the solid, transferring the solid to a baking oven with the temperature of 200 ℃, baking for 2h, then air-cooling to room temperature, and then crushing into powder with the particle size of 50 microns to obtain the biochar.
The flame-retardant emulsion is prepared by the following steps of:
(1) adding 12 parts of emulsifier, 210 parts of water and 12 parts of modified nano-silica into a reaction kettle, heating to 68 ℃, and stirring for 15min to obtain an emulsion; the emulsifier is formed by mixing sodium dodecyl sulfate, AEO-9 and isomeric tridecanol polyoxyethylene ether according to the mass ratio of 3:2: 1;
(2) dissolving 1.2 parts of initiator potassium persulfate in 40 parts of emulsion to form an initiator solution;
(3) uniformly mixing methyl methacrylate, butyl acrylate, styrene, diethyl vinylphosphonate and double-end vinyl silicone oil according to the mass ratio of 24:72:20:21:16 to obtain a reactant; the structural formula of the double-end-capped vinyl silicone oil is as follows:
CH2＝CH-Si(CH3)2O[(CH3)2SiO]n(CH3)2Si-CH＝CH2a molecular weight of about 1000;
(4) adding 20 wt% of reactants into a reaction kettle, stirring for 30min at room temperature, then heating to 82 ℃, adding 1/3 initiator solution, and keeping the temperature for reaction for 30 min;
(5) dropwise adding the rest reactants and the initiator solution into the reaction kettle in 4h, and continuing to perform heat preservation reaction for 1h after dropwise adding; then cooling to below 40 ℃ to obtain the flame-retardant emulsion.
The solid materials in the preparation raw materials of the coating exist in a powder form, and the particle size of the powder is 50 mu m.
The fireproof flame-retardant ecological coating in the embodiment is prepared by the following steps:
s1: dispersing kaolin and diatom ooze into water, stirring at a stirring speed of 45rpm, and adding lime under stirring to obtain a coating base material;
s2: adding the biochar, titanium dioxide, a film forming auxiliary agent, a flame retardant, a binder and a flame retardant emulsion into a coating base material, and ultrasonically stirring for 45min at an ultrasonic frequency of 25kHz to obtain a coating primary product;
s3: adding oleum Pini and glycerol into the primary paint, and stirring at 45rpm for 45 min.
Example 2
The fireproof flame-retardant ecological coating is prepared from the following raw materials in parts by mass:
100 parts of lime, 100 parts of kaolin, 20 parts of diatom ooze, 40 parts of biochar, 10 parts of titanium dioxide, 20 parts of pine oil, 5 parts of glycerol, 15 parts of a film-forming aid, 5 parts of a flame retardant, 40 parts of a binder, 10 parts of a flame-retardant emulsion and 750 parts of water. Wherein the film-forming assistant is propylene glycol; the flame retardant is formed by mixing aluminum hydroxide and magnesium hydroxide according to the mass ratio of 1: 1; the binder is water glass.
The biochar is prepared by the following steps:
s1: mixing the residual traditional Chinese medicine residues after the heat-clearing and spleen-purging powder is decocted with fermentation liquor according to a material-liquid ratio of 1g to 2mL, carrying out closed fermentation at 35 ℃ for 24 hours, then carrying out solid-liquid separation, collecting solids, and drying until the water content is lower than 5% to obtain a biomass raw material; the fermentation liquor is aqueous solution of cellulase and pectinase, and the concentrations of the cellulase and the pectinase in the fermentation liquor are 2g/mL and 0.5g/mL respectively;
s2: crushing a biomass raw material into particles with the particle size of 500 mu m, then filling the particles into an atmosphere box furnace, vacuumizing, introducing nitrogen, heating to 280 ℃ at the heating rate of 20 ℃/min, performing heat preservation treatment for 45min, heating to 580 ℃ at the heating rate of 10 ℃/min, performing heat preservation treatment for 4h, and then air-cooling to room temperature to obtain a biochar primary product;
s3: dispersing the biochar primary product in 45 wt% sulfuric acid solution, stirring at a stirring speed of 45rpm for 45min, then carrying out solid-liquid separation, collecting the solid, transferring the solid to a baking oven with the temperature of 220 ℃, baking for 1h, then air-cooling to room temperature, and then crushing into powder with the particle size of 60 mu m to obtain the biochar.
The preparation of the flame-retardant emulsion is the same as in example 1.
The solid materials in the preparation raw materials of the coating exist in a powder form, and the particle size of the powder is 60 mu m.
The fireproof flame-retardant ecological coating in the embodiment is prepared by the following steps:
s1: dispersing kaolin and diatom ooze into water, stirring at a stirring speed of 60rpm, and adding lime under the stirring condition to obtain a coating base material;
s2: adding the biochar, titanium dioxide, a film forming auxiliary agent, a flame retardant, a binder and a flame retardant emulsion into a coating base material, and ultrasonically stirring for 30min at the ultrasonic frequency of 40kHz to obtain a coating primary product;
s3: adding oleum Pini and glycerol into the primary paint, and stirring at 60rpm for 30 min.
Example 3
The fireproof flame-retardant ecological coating is prepared from the following raw materials in parts by mass:
120 parts of lime, 80 parts of kaolin, 40 parts of diatom ooze, 20 parts of biochar, 20 parts of titanium dioxide, 10 parts of pine oil, 15 parts of glycerol, 5 parts of a film-forming aid, 15 parts of a flame retardant, 20 parts of a binder, 20 parts of a flame-retardant emulsion and 650 parts of water. Wherein the film-forming assistant is hexanediol; the flame retardant is formed by mixing aluminum hydroxide and magnesium hydroxide according to the mass ratio of 1: 3; the binder is water glass.
The biochar is prepared by the following steps:
s1: mixing the residual traditional Chinese medicine residues after the heat-clearing and spleen-purging powder is decocted with fermentation liquor according to the material-liquid ratio of 1g to 3mL, carrying out closed fermentation for 12h at 40 ℃, then carrying out solid-liquid separation, collecting solids and drying until the water content is lower than 5% to obtain a biomass raw material; the fermentation liquor is aqueous solution of cellulase and pectinase, and the concentrations of the cellulase and the pectinase in the fermentation liquor are 1g/mL and 1g/mL respectively;
s2: crushing a biomass raw material into particles with the particle size of 200 mu m, then filling the particles into an atmosphere box furnace, vacuumizing, introducing nitrogen, heating to 320 ℃ at the heating rate of 20 ℃/min, carrying out heat preservation treatment for 30min, heating to 600 ℃ at the heating rate of 10 ℃/min, carrying out heat preservation treatment for 2h, and then air-cooling to room temperature to obtain a biochar primary product;
s3: dispersing the biochar primary product in 45 wt% sulfuric acid solution, stirring at a stirring speed of 60rpm for 30min, then carrying out solid-liquid separation, collecting the solid, transferring the solid to a baking oven with the temperature of 180 ℃, baking for 2h, then air-cooling to room temperature, and then crushing into powder with the particle size of 40 mu m to obtain the biochar.
The preparation of the flame-retardant emulsion is the same as in example 1.
The solid materials in the preparation raw materials of the coating exist in a powder form, and the particle size of the powder is 40 mu m.
The fireproof flame-retardant ecological coating in the embodiment is prepared by the following steps:
s1: dispersing kaolin and diatom ooze into water, stirring at a stirring speed of 45rpm, and adding lime under stirring to obtain a coating base material;
s2: adding the biochar, titanium dioxide, a film forming auxiliary agent, a flame retardant, a binder and a flame retardant emulsion into a coating base material, and ultrasonically stirring for 45min at an ultrasonic frequency of 25kHz to obtain a coating primary product;
s3: adding oleum Pini and glycerol into the primary paint, and stirring at 60rpm for 30 min.
Comparative example 1
Compared with the coating in example 1, the biological carbon in the components is replaced by active carbon, and the rest components and operation are the same as example 1.
Comparative example 2
Compared with the coating in example 1, the fireproof flame-retardant ecological coating has the advantages that diatom ooze is absent in the components, and the rest components and operation are the same as those in example 1.
Comparative example 3
Compared with the coating in example 1, the biochar in the components is the commercial biochar, and the rest components and operation are the same as in example 1.
Comparative example 4
Compared with the coating in example 1, the fireproof flame-retardant ecological coating is lack of pine oil and glycerin in the components, and the rest components and operation are the same as example 1.
Comparative example 5
Compared with the coating in example 1, the fireproof flame-retardant ecological coating has the advantages that the flame-retardant emulsion is absent in the components, and the rest of the components and the operation are the same as those in example 1.
Analysis of results
The coatings prepared in the above examples and comparative examples were applied to test boards to form a film layer having a thickness of about 2mm, and the air cleaning ability of the film layer was examined, and the results are shown in table 1. The air purification capability test method comprises the following steps: placing the plate coated with the coating in a closed space, and introducing gasified formaldehyde to ensure that the content of formaldehyde in the closed space is 1g/m3(ii) a After 24 hours the content of air formaldehyde in the box was measured again.
TABLE 1 air purification effect of coating film layer
The stability and fire resistance of the coating film was further examined and the results are shown in Table 2. The test method comprises the following steps: coating the paint on an experimental plate to form a film layer with the thickness of about 2mm, drying and forming at room temperature, and connecting a temperature detector on the back of the experimental plate. After the coating layer is formed and cured, the coating layer is directly heated for 180 seconds by a high-temperature spray gun at 1000 ℃, the change of the coating layer is observed in the process, and the temperature change of the back of the experimental plate is detected.
TABLE 2 stability and fire resistance of the coating film layer
While the present invention has been described in detail with reference to the embodiments, it should not be construed as limited to the scope of the patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (10)
1. The fireproof flame-retardant ecological coating is characterized by being prepared from the following raw materials in parts by mass:
100-120 parts of lime, 80-100 parts of kaolin, 20-40 parts of diatom ooze, 20-40 parts of biochar, 10-20 parts of titanium dioxide, 10-20 parts of pine oil, 5-15 parts of glycerol, 5-15 parts of a film forming additive, 5-15 parts of a flame retardant, 20-40 parts of a binder, 10-20 parts of a flame retardant emulsion and 650-750 parts of water.
2. The fireproof flame-retardant ecological coating according to claim 1, characterized in that: the material is prepared from the following raw materials in parts by mass:
110 parts of lime, 90 parts of kaolin, 30 parts of diatom ooze, 30 parts of biochar, 15 parts of titanium dioxide, 15 parts of pine oil, 10 parts of glycerol, 10 parts of a film-forming aid, 10 parts of a flame retardant, 30 parts of a binder, 15 parts of a flame-retardant emulsion and 700 parts of water.
3. The fireproof flame-retardant ecological coating according to claim 1 or 2, characterized in that: the solid materials in the preparation raw materials exist in a powder form, and the particle size of the powder is 40-60 mu m.
4. The fire-retardant ecological paint according to claim 1 or 2, characterized in that: the flame-retardant emulsion is prepared by the following steps:
(1) mixing an emulsifier, modified nano-silica and water, and stirring at 65-70 ℃ for 10-20 min to obtain an emulsion; the emulsifier is formed by mixing sodium dodecyl sulfate, AEO-9 and isomeric tridecanol polyoxyethylene ether according to the mass ratio of 3:2: 1;
(2) dissolving potassium persulfate in the emulsion to form an initiator solution;
(3) uniformly mixing methyl methacrylate, butyl acrylate, styrene, diethyl vinylphosphonate and double-end vinyl silicone oil according to the mass ratio of 24:72:20:21:16 to obtain a reactant;
(4) adding 20 wt% of reactants into a reaction kettle, stirring for 30min at room temperature, then heating to 80-85 ℃, adding 1/3 initiator solution, and keeping the temperature for reaction for 30 min;
(5) dropwise adding the rest reactant and the initiator solution into the reaction kettle in 3-4 h, and continuing to perform heat preservation reaction for 1h after dropwise adding is finished; then cooling to below 40 ℃ to obtain the flame-retardant emulsion.
5. The fireproof flame-retardant ecological coating according to claim 1, wherein the biochar is prepared by the following steps:
s1: mixing the traditional Chinese medicine residues with fermentation liquor according to a material-liquid ratio of 1g: 2-4 mL, carrying out closed fermentation at 35-40 ℃ for 12-24 h, then carrying out solid-liquid separation, collecting solids, and drying until the water content is lower than 5% to obtain a biomass raw material; the fermentation liquor is an aqueous solution of cellulase and pectinase;
s2: crushing a biomass raw material into particles with the particle size of 200-500 mu m, then loading the particles into a carbonization device, introducing protective gas, heating to 280-320 ℃ at the heating rate of 20 ℃/min, carrying out heat preservation treatment for 30-45 min, heating to 580-600 ℃ at the heating rate of 10 ℃/min, carrying out heat preservation treatment for 2-4 h, and then air-cooling to room temperature to obtain a biochar primary product;
s3: dispersing the biochar primary product in 40-45 wt% sulfuric acid solution, stirring at a stirring speed of 45-60 rpm for 30-45 min, then carrying out solid-liquid separation, collecting solids, transferring the solids to an oven at the temperature of 180-220 ℃, baking for 1-2 h, then air cooling to room temperature, and then crushing into powder with the particle size of 40-60 mu m to obtain the biochar.
6. The fireproof flame-retardant ecological coating according to claim 5, characterized in that: the concentrations of the cellulase and the pectinase in the fermentation liquor are 1-2 g/mL and 0.5-1 g/mL respectively.
7. The fireproof flame-retardant ecological coating according to claim 1 or 2, characterized in that: the flame retardant is formed by mixing aluminum hydroxide and magnesium hydroxide according to the mass ratio of 1: 1-3.
8. The fireproof flame-retardant ecological coating according to claim 1 or 2, characterized in that: the film-forming assistant is ethylene glycol, propylene glycol or hexanediol.
9. The fireproof flame-retardant ecological coating according to claim 1 or 2, characterized in that: the binder is water glass.
10. The preparation method of the fireproof flame-retardant ecological paint according to any one of claims 1 to 9, which comprises the following steps:
s1: dispersing kaolin and diatom ooze in water, and then adding lime under the stirring condition to obtain a coating base material;
s2: adding the biochar, titanium dioxide, a film forming auxiliary agent, a flame retardant, a binder and a flame retardant emulsion into a coating base material, and ultrasonically stirring for 30-60 min to obtain a coating primary product;
s3: and adding the pine oil and the glycerol into the primary paint, and stirring for 30-45 min to obtain the paint.
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| CN105505998A (en) * | 2015-12-15 | 2016-04-20 | 北京科技大学 | Method for preparing alcohol and biochar from traditional Chinese medicine residues in gradient mode |
| CN108912928A (en) * | 2018-06-25 | 2018-11-30 | 段小宁 | Fire-retardant, waterproof aqueous core shell acrylic esters resin coating and paint preparation method |
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