CN109943112B - Ecological photocatalytic fireproof coating for air purification and preparation method thereof - Google Patents
Ecological photocatalytic fireproof coating for air purification and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an ecological photocatalytic fireproof coating for air purification and a preparation method thereof, belonging to the field of functional coatings. The ecological photocatalytic fireproof paint comprises a base material, a catalyst, a char forming agent, a foaming agent, a flame-retardant filler, a photocatalytic pigment, an inorganic solvent, a dispersing agent, a drier, a drying assistant and a nanometer mother solution. The invention solves the problem that the prior art utilizes metal elements and rare earth elements to react with TiO2The modification has the problems of high cost and complex process and the defect of single function of the coating filler, not only endows the fireproof coating with brand-new function, opens up the way of novel functional coating, but also reduces the production cost of the photocatalytic fireproof coating by about 30 percent and improves the market competitiveness of the photocatalytic fireproof coating. By using steel slag to TiO2The modified red mud micro powder is used as a photocatalytic pigment and the flame retardant filler to prepare the ecological photocatalytic fireproof coating, so that a new way for utilizing metallurgical solid waste is developed, and high value-added application of the metallurgical solid waste is realized.
Description
Technical Field
The invention belongs to the field of functional coatings, and particularly relates to steel slag modified TiO modified by using Bayer process red mud micro powder, sintering process red mud micro powder and mixed process red mud micro powder as flame retardant filler2The ecological photocatalytic fireproof coating used for air purification, which can comprehensively utilize metallurgical solid wastes, is prepared as a photocatalytic pigment.
Background
The steel slag is solid waste generated in the steel-making process and accounts for about 15 to 20 percent of the steel-making yield. The steel slag mainly comprises calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus and the like, namely SiO2、Fe2O3、Al2O3、ZnO、CaO、MgO、P2O5、MnO、SO3And the like, and also contains a small amount of free calcium oxide, metallic iron, and the like. The red mud is waste residue generated in the production process of alumina, and the main component of the red mud is SiO2、CaO、Fe2O3、Al2O3、Na2O、TiO2、K2O, etc., and further contains causticizing alkali components, trace nonferrous metals, etc. At present, a large amount of steel slag and red mud are piled up, which not only occupies valuable land, but also causes pollution to the surrounding environment and underground water. Therefore, how to utilize the steel slag and the red mud in a large scale and high efficiency to realize the reduction of the environment and the improvement of enterprises is a problem which needs to be solved urgently.
Inorganic TiO pigment with good thermal stability of metal elements and rare earth elements is generally adopted in the coating industry2Modified to improve TiO2The purposes of very low quantum efficiency, low photocatalytic activity and low visible light utilization rate are achieved, and the improvement of the modified TiO is realized2Absorption capacity for visible light. At present, metal elements and rare earth elements are utilized to couple TiO2The modification has the problems of high cost and complex process, if the metal element contained in the steel slag is used for modifying TiO2The modification is carried out to realize the aim of photocatalytic degradation of formaldehyde under a visible light source, and the modified TiO can be greatly reduced2The cost is reduced, and the utilization added value of the steel slag can be improved. While utilizing a catalyst containing a large amount of A12O3The red mud micro powder is used as a coating filler, and A1 in the red mud micro powder is in alkaline condition2O3 can be mixed with ZnO, MgO and P contained in steel slag2O5And the like, thereby improving the flame retardant property of the coating. Therefore, the steel slag is utilized to react with TiO2The modified red mud micro powder is used as a photocatalytic pigment and the red mud micro powder is used as a flame retardant filler to prepare the ecological photocatalytic fireproof coating for air purification, so that the high-added-value cyclic utilization of metallurgical solid waste is realized, the synergism of metallurgical enterprises is promoted, a new approach for utilizing the metallurgical solid waste is developed, and the cost of coating enterprises is reduced.
Disclosure of Invention
To solve the problemUsing metal elements and rare earth elements to TiO2The modification has the problems of high cost and complex process and the defect of single function of the coating filler, and the invention utilizes the steel slag to carry out modification on TiO2The modified red mud micro powder is used as a photocatalytic pigment and the flame retardant filler to prepare the ecological paint, and the stirring speed, the stirring time, the stirring temperature, the heating speed, the calcining temperature and the like are controlled, so that the high-added-value recycling of metallurgical solid wastes is realized, and the multifunctional paint with the photocatalytic performance and the fireproof performance is obtained.
In order to solve the above technical problems, the present invention is realized by the following technical solutions.
The invention provides an ecological photocatalytic fireproof coating for air purification, which comprises the following raw materials in percentage by weight:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is one or more of Bayer process red mud micro powder, sintering process red mud micro powder and mixed process red mud micro powder; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
The invention also provides a preparation method of the ecological photocatalytic fireproof coating for air purification, which comprises the following steps:
firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring the solution for 30 to 45min at the speed of 500 to 800r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding the dilute hydrochloric acid solution in which the steel slag micro powder is dissolved into the solution at the speed of 800 to 1000r/min, stirring the solution at the speed of 800 to 1000r/min for 45 to 60min to obtain a liquid sol, and aging the liquid sol indoors to form a dry gelThen the dried gel is put into a medium temperature experimental furnace to be heated to 600 ℃ to 800 ℃ at the speed of 1.5 ℃/min to 2.5 ℃/min, the temperature is kept for 2 hours, and the dried gel is naturally cooled to the room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 40-60%, and the steel slag micro powder is molten iron desulphurization tailing micro powder, casting residue micro powder, converter hot splashing slag micro powder, converter roller slag micro powder, electric furnace hot splashing slag micro powder and electric furnace roller slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
Secondly, stirring the dispersing agent and the inorganic solvent for 5min to 10min under the condition of 1000r/min to 1500r/min, sequentially adding the base material and the flame-retardant filler, stirring for 5min to 10min under the condition of 1000r/min to 1500r/min, adding the photocatalytic pigment, stirring for 5min to 10min under the condition of 1000r/min to 1500r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 10min to 30min under the condition of 800r/min to 1000r/min, and obtaining the photocatalytic fireproof white slurry.
And finally, pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 5-10 min at the speed of 500-800 r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 20-30 min at the speed of 500-800 r/min to obtain the ecological photocatalytic fireproof paint.
The scientific principle of the invention is as follows:
on the one hand, dilute hydrochloric acid solution is used for treating Fe contained in steel slag2O3、Al2O3、ZnO、MgO、P2O5MnO partial dissolution of TiO2Modifying to realize steel slag modified TiO2The formaldehyde is degraded under the photocatalysis of a visible light source.
On the other hand, the red mud fine powder contains a large amount of a flame retardant Al substance with a high melting point2O3Al in the red mud micro powder under alkaline condition2O3Can be mixed with ZnO, MgO and P contained in the steel slag2O5And the flame retardant synergistic effect is generated, and the flame retardant effect is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problem of using gold in the prior artMetal and rare earth element to TiO2The modification has the problems of high cost and complex process and the defect of single function of the coating filler, not only endows the fireproof coating with brand-new function, opens up the way of novel functional coating, but also reduces the production cost of the photocatalytic fireproof coating by about 30 percent and improves the market competitiveness of the photocatalytic fireproof coating.
2. The invention utilizes the steel slag to TiO2The modified red mud micro powder is used as a photocatalytic pigment and the flame retardant filler to prepare the ecological photocatalytic fireproof coating, so that a new way for utilizing the metallurgical solid waste is developed, the application of the metallurgical solid waste with high added value is realized, and the purpose of 'using waste to increase efficiency' is achieved.
3. The ecological photocatalytic fireproof coating for air purification and the preparation method thereof meet the policy requirements of relevant energy conservation, environmental protection and circular economy.
Drawings
FIG. 1 is a schematic view of an HJC-1 environmental test chamber simulating an indoor environment under a visible light source;
FIG. 2 is a schematic representation of the fire resistance test;
in the figure: 1. a temperature and humidity sensor; 2. a sampling port; 3. a fan; 4. a visible light source; 5. alcohol blowtorch; 6. a support; 7. an iron stand with an iron clamp; 8. a test board; a. formaldehyde gas; b. an ecological photocatalytic fireproof coating.
Detailed Description
The present invention will be described in detail with reference to specific examples, but the present invention is not limited to the examples.
Example 1
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is Bayer process red mud micro powder; the photocatalysisThe pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 40min at 600r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution at 1000r/min, stirring for 45min at 900r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace, heating to 600 ℃ at 2.0 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 50%, and the steel slag micro powder is molten iron desulphurization tailing micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
And secondly, stirring the dispersing agent and the inorganic solvent for 8min at the speed of 1100r/min, sequentially adding the base material and the flame-retardant filler, stirring for 6min at the speed of 1400r/min, adding the photocatalytic pigment, stirring for 10min at the speed of 1200r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 15min at the speed of 900r/min, and thus obtaining the photocatalytic fireproof white slurry.
And finally, pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 7min at the speed of 500r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 30min at the speed of 800r/min to obtain the ecological photocatalytic fireproof coating.
Example 2
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is sintering red mud micro powder; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring the solution for 30min at the speed of 700r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution at the speed of 800r/min, stirring the solution for 55min at the speed of 1000r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to rise to 700 ℃ at the speed of 2.5 ℃/min, keeping the temperature for 2h, and naturally cooling the solution to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the steel slag micro powder is 60 percent, and the steel slag micro powder is casting residue micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
Secondly, stirring the dispersing agent and the inorganic solvent for 7min at 1500r/min, sequentially adding the base material and the flame-retardant filler, stirring for 9min at 1000r/min, adding the photocatalytic pigment, stirring for 5min at 1300r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 25min at 800r/min, and obtaining the photocatalytic fireproof white slurry.
And finally pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 8min at the speed of 800r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 20min at the speed of 600r/min to obtain the ecological photocatalytic fireproof coating.
Example 3
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is red mud micro powder prepared by a mixed combination method; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 45min at the condition of 800r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution at the condition of 900r/min, stirring for 60min at the condition of 800r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to be heated to 800 ℃ at the speed of 1.5 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 45%, and the steel slag micro powder is converter hot splashing slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
And secondly, stirring the dispersing agent and the inorganic solvent for 5min at 1200r/min, sequentially adding the base material and the flame-retardant filler, stirring for 7min at 1200r/min, adding the photocatalytic pigment, stirring for 8min at 1100r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 30min at 1000r/min, and thus obtaining the photocatalytic fireproof white slurry.
And finally pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 10min at 600r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 25min at 500r/min to obtain the ecological photocatalytic fireproof coating.
Example 4
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is red mud micro powder prepared by a mixed combination method; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 35min under the condition of 500r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution under the condition of 900r/min, stirring for 50min under the condition of 1000r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to be heated to 600 ℃ at the speed of 2.5 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 55 percent, and the steel slag micro powder is converter roller slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
And secondly, stirring the dispersing agent and the inorganic solvent for 10min at 1400r/min, sequentially adding the base material and the flame-retardant filler, stirring for 5min at 1300r/min, adding the photocatalytic pigment, stirring for 7min at 1500r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 10min at 900r/min, and obtaining the photocatalytic fireproof white slurry.
And finally pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 9min at the speed of 700r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 30min at the speed of 700r/min to obtain the ecological photocatalytic fireproof coating.
Example 5
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is sintering red mud micro powder; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 45min at 700r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution at 1000r/min, stirring for 55min at 800r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to rise to 700 ℃ at 1.5 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 40%, and the electric furnace hot splashing slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
Secondly, stirring the dispersing agent and the inorganic solvent for 9min at 1300r/min, sequentially adding the base material and the flame-retardant filler, stirring for 10min at 1500r/min, adding the photocatalytic pigment, stirring for 6min at 1000r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 20min at 1000r/min, and obtaining the photocatalytic fireproof white slurry.
And finally, pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 5min at 600r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 20min at 800r/min to obtain the ecological photocatalytic fireproof coating.
Example 6
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is Bayer process red mud micro powder; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 35min under the condition of 600r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution under the condition of 800r/min, stirring for 50min under the condition of 1000r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to be heated to 800 ℃ at the speed of 2.0 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 40%, and the steel slag micro powder is electric furnace roller slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
Secondly, stirring the dispersing agent and the inorganic solvent for 6min at the speed of 1000r/min, sequentially adding the base material and the flame-retardant filler, stirring for 8min at the speed of 1100r/min, adding the photocatalytic pigment, stirring for 9min at the speed of 1400r/min, sequentially adding the catalyst, the char forming agent and the foaming agent, stirring for 30min at the speed of 800r/min, and obtaining the photocatalytic fireproof white slurry.
And finally pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 6min at the speed of 700r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 25min at the speed of 500r/min to obtain the ecological photocatalytic fireproof coating.
Comparative example 1
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring for 35min under the condition of 600r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding a dilute hydrochloric acid solution in which steel slag micro powder is dissolved into the solution under the condition of 800r/min, stirring for 50min under the condition of 1000r/min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to be heated to 800 ℃ at the speed of 2.0 ℃/min, keeping the temperature for 2h, and naturally cooling to room temperature to obtain the steel slag modified TiO2. The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 40%, and the steel slag micro powder is electric furnace roller slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
Secondly, stirring the dispersing agent and the inorganic solvent for 6min at the speed of 1000r/min, adding the base material and stirring for 8min at the speed of 1100r/min, adding the photocatalytic pigment and stirring for 9min at the speed of 1400r/min, sequentially adding the catalyst, the char forming agent and the foaming agent and stirring for 30min at the speed of 800r/min to obtain the photocatalytic white slurry.
And finally pouring the photocatalytic white slurry into a paint mixing cylinder, stirring for 6min at the speed of 700r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 25min at the speed of 500r/min to obtain the ecological photocatalytic coating.
Comparative example 2
The components used for preparing 100g of the product of the invention and the mass ratio thereof are as follows:
the base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is Bayer process red mud micro powder; the inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aid is zinc powder; the nano mother liquid is nano SiO2And (4) mother liquor.
Firstly, stirring a dispersing agent and an inorganic solvent for 6min at the speed of 1000r/min, then sequentially adding a base material and a flame-retardant filler, stirring for 8min at the speed of 1100r/min, then sequentially adding a catalyst, a char forming agent and a foaming agent, and stirring for 30min at the speed of 800r/min to obtain the fireproof white slurry.
And pouring the fireproof white slurry into a paint mixing cylinder, stirring for 6min at the speed of 700r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 25min at the speed of 500r/min to obtain the ecological fireproof paint.
The performance test procedures of the preparation examples 1-6 and the comparative examples 1-2 are as follows:
an indoor environment under a visible light source (as shown in figure 1) was simulated by using an HJC-1 type environment test chamber commonly adopted in the european union. The temperature and humidity sensor 1 is used, the temperature is set to be 23 +/-0.5 ℃, and the humidity is set to be 45 +/-3%. Dripping 2.5 mu L of 37-40% formaldehyde analytical pure solution on a culture dish, and placing the culture dish into a ringThe environment testing cabin is fully volatilized in the environment testing cabin, and the concentration of the formaldehyde gas a in the whole environment testing cabin is 1mg/m by utilizing the fan 33. The ecological photocatalytic fireproof coating b with the theoretical coating thickness (200 mu m) is loaded to 0.1m2The test plate of (1) is excited by a visible light source (4) to produce a catalytic effect. By adopting an acetylacetone spectrophotometry (GB/T15516-1995), gas in a 10L cabin is sampled at 240min by using a sampling port 2, and the concentration change of formaldehyde gas in an environment test cabin is detected, so that the efficiency of the ecological photocatalytic fireproof coating for photocatalytic degradation of formaldehyde can be calculated.
A vertical combustion method (as shown in fig. 2) is used. Coating the ecological photocatalytic fireproof paint b on one side of a test board 8, placing the test board on an iron stand 7 with an iron clamp, facing the alcohol blast burner 5 on one side of the test board coated with the ecological photocatalytic fireproof paint, keeping the vertical distance between the test board and the mouth of the alcohol blast burner about 7cm, and starting timing to the detection end point when the flame temperature reaches about 1000 ℃. During detection, the back fire surface of the test board is carbonized during combustion, cracks appear, and the end point of the flame-resistant time (min) is determined.
TABLE 1 ecological photocatalytic fireproof paint Performance test results
| Serial number | Surface drying time/h | Actual drying time/h | Flame resistance time/min | Efficiency/% of photocatalytic degradation of formaldehyde |
| Example 1 | 3 | 16 | 56 | 55.8 |
| Example 2 | 4 | 26 | 72 | 51.2 |
| Example 3 | 2 | 12 | 65 | 45.3 |
| Example 4 | 4 | 23 | 77 | 46.1 |
| Example 5 | 2 | 11 | 61 | 49.8 |
| Example 6 | 4 | 25 | 53 | 56.5 |
| Comparative example 1 | 7 | 29 | 14 | 53.4 |
| Comparative example 2 | 9 | 34 | 48 | 5.6 |
Claims (2)
1. An ecological photocatalytic fireproof coating for air purification is characterized by comprising the following raw materials in percentage by weight:
5 to 15 percent of base material
1 to 3 percent of catalyst
1 to 3 percent of charring agent
1 to 3 percent of foaming agent
15 to 25 percent of flame-retardant filler
15 to 25 percent of photocatalytic pigment
30 to 55 percent of inorganic solvent
1 to 5 percent of dispersant
0.1 to 0.5 percent of drier
0.1 to 0.5 percent of drying assistant agent
1 to 5 percent of nano mother solution
The base material is aluminum dihydrogen phosphate; the catalyst is ammonium polyphosphate; the char-forming agent is dipentaerythritol; the foaming agent is melamine; the flame-retardant filler is one or more of Bayer process red mud micro powder, sintering process red mud micro powder and mixed process red mud micro powder; the photocatalytic pigment is steel slag modified TiO2(ii) a The inorganic solvent is water; the dispersant is sodium hexametaphosphate; the drier is manganese dioxide; the drying aidIs zinc powder; the nano mother liquid is nano SiO2Mother liquor;
the photocatalytic pigment-steel slag modified TiO2The preparation method comprises the following steps:
firstly, according to the volume ratio of tetrabutyl titanate to absolute ethyl alcohol of 1: 3, stirring the solution for 30 to 45min at the speed of 500 to 800r/min by using a constant-temperature magnetic stirrer to obtain a uniform transparent solution, then slowly adding the dilute hydrochloric acid solution in which the steel slag micro powder is dissolved into the solution at the speed of 800 to 1000r/min, stirring the solution at the speed of 800 to 1000r/min for 45 to 60min to obtain a liquid sol, ageing the liquid sol indoors to form a dry gel, then putting the dry gel into a medium-temperature experimental furnace to be heated to 600 to 800 ℃ at the speed of 1.5 to 2.5 ℃/min, keeping the temperature for 2h, and naturally cooling the dry gel to the room temperature to obtain the steel slag modified TiO2；
The steel slag modified TiO2The mass percent of the medium steel slag micro powder is 40-60%, and the steel slag micro powder is one or more of molten iron desulphurization tailing micro powder, casting residue micro powder, converter hot splashing slag micro powder, converter roller slag micro powder, electric furnace hot splashing slag micro powder and electric furnace roller slag micro powder; the tetrabutyl titanate, the absolute ethyl alcohol and the hydrochloric acid are analytically pure.
2. The preparation method of the ecological type photocatalytic fire-retardant coating for air purification according to claim 1, is characterized by comprising the following steps:
stirring a dispersing agent and an inorganic solvent for 5min to 10min under the condition of 1000r/min to 1500r/min, sequentially adding a base material and a flame-retardant filler, stirring for 5min to 10min under the condition of 1000r/min to 1500r/min, adding a photocatalytic pigment, stirring for 5min to 10min under the condition of 1000r/min to 1500r/min, sequentially adding a catalyst, a char forming agent and a foaming agent, stirring for 10min to 30min under the condition of 800r/min to 1000r/min, and obtaining photocatalytic fireproof white slurry;
pouring the photocatalytic fireproof white slurry into a paint mixing cylinder, stirring for 5-10 min at the speed of 500-800 r/min, sequentially adding a drier, a drying assistant and a nano mother solution, and stirring for 20-30 min at the speed of 500-800 r/min to obtain the ecological photocatalytic fireproof paint.
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| CN110205026B (en) * | 2019-07-10 | 2021-07-09 | 安徽工业大学 | High-adhesion coating with flame retardant and antirust properties and preparation method thereof |
| CN114873973B (en) * | 2022-06-01 | 2023-02-28 | 安徽工业大学 | Photocatalytic solid waste-based cement particle board and preparation method thereof |
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