CN115785817A - Drier and preparation method and application thereof - Google Patents
Drier and preparation method and application thereof Download PDFInfo
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- CN115785817A CN115785817A CN202211383280.XA CN202211383280A CN115785817A CN 115785817 A CN115785817 A CN 115785817A CN 202211383280 A CN202211383280 A CN 202211383280A CN 115785817 A CN115785817 A CN 115785817A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 150000007524 organic acids Chemical class 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
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- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
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- 239000007857 degradation product Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003385 bacteriostatic effect Effects 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 20
- 239000000126 substance Substances 0.000 abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 13
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000020477 pH reduction Effects 0.000 abstract description 2
- 238000007127 saponification reaction Methods 0.000 abstract description 2
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- 239000003963 antioxidant agent Substances 0.000 description 3
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- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
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- 229910052725 zinc Inorganic materials 0.000 description 2
- IZFHEQBZOYJLPK-SSDOTTSWSA-N (R)-dihydrolipoic acid Chemical compound OC(=O)CCCC[C@@H](S)CCS IZFHEQBZOYJLPK-SSDOTTSWSA-N 0.000 description 1
- 101710161460 3-oxoacyl-[acyl-carrier-protein] synthase Proteins 0.000 description 1
- OEOIWYCWCDBOPA-UHFFFAOYSA-N 6-methyl-heptanoic acid Chemical compound CC(C)CCCCC(O)=O OEOIWYCWCDBOPA-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- RGJOEKWQDUBAIZ-IBOSZNHHSA-N CoASH Chemical compound O[C@@H]1[C@H](OP(O)(O)=O)[C@@H](COP(O)(=O)OP(O)(=O)OCC(C)(C)[C@@H](O)C(=O)NCCC(=O)NCCS)O[C@H]1N1C2=NC=NC(N)=C2N=C1 RGJOEKWQDUBAIZ-IBOSZNHHSA-N 0.000 description 1
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- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 1
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- RGJOEKWQDUBAIZ-UHFFFAOYSA-N coenzime A Natural products OC1C(OP(O)(O)=O)C(COP(O)(=O)OP(O)(=O)OCC(C)(C)C(O)C(=O)NCCC(=O)NCCS)OC1N1C2=NC=NC(N)=C2N=C1 RGJOEKWQDUBAIZ-UHFFFAOYSA-N 0.000 description 1
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- KDTSHFARGAKYJN-UHFFFAOYSA-N dephosphocoenzyme A Natural products OC1C(O)C(COP(O)(=O)OP(O)(=O)OCC(C)(C)C(O)C(=O)NCCC(=O)NCCS)OC1N1C2=NC=NC(N)=C2N=C1 KDTSHFARGAKYJN-UHFFFAOYSA-N 0.000 description 1
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- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 1
- 235000020778 linoleic acid Nutrition 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a drier and a preparation method and application thereof. A preparation method of the drier comprises the following steps: mixing red mud and organic acid, stirring for reaction, and filtering to obtain a solid serving as the drier; the temperature of the stirring reaction is 150-550 ℃. The drier prepared from the red mud is treated by acidification and saponification, so that polluting substances are not generated, the preparation time is greatly reduced, heavy metal ion components, rare earth element components and special environmental factors thereof are utilized to the maximum extent, and multi-angle omnibearing efficient drying is achieved.
Description
Technical Field
The invention relates to the technical field of red mud resource utilization, and particularly relates to a drier and a preparation method and application thereof.
Background
The red mud is strong alkaline solid waste generated in the process of extracting bauxite by using alumina, and is named as the red mud because the red mud is rich in reddish brown iron oxide. According to different compositions, technical levels and production process parameters of bauxite, 1-2 tons of red mud can be generated when 1 ton of alumina is produced. Wherein the red mud is rich in heavy metal elements such as calcium, aluminum, iron, copper, zinc and the like and some rare earth elements, and is a renewable resource. However, the existing red mud disposal mode is mainly stacking, which not only occupies land and wastes resources, but also is easy to form environmental pollution and potential safety hazard. Therefore, an effective method for comprehensively utilizing the red mud is urgently needed to reduce the increasingly serious red mud stacking risk, which has great significance for the sustainable development of the alumina industry in China.
The drier is a substance capable of accelerating the drying of a coating film, and plays a catalytic role in oxygen absorption and polymerization of a dry oil film. With the development of industrialization, the demand of coating is increasing. How to efficiently and quickly dry the coating is another problem to be solved urgently at present.
The traditional drier is generally organic acid soap of metals such as cobalt, manganese, lead, zinc, calcium and the like. The commonly used driers in the current market are cobalt driers, dibutyltin dilaurate driers and lead driers. But the cobalt drier has less resources, mostly depends on import and has high price; the solidifying point of the dibutyltin dilaurate drier is 16-23 ℃, and solid matters can be precipitated when the temperature is lowered in winter, so that the catalytic action is greatly reduced, even no catalytic action exists, the appearance performance of paint and a paint film is influenced, and products containing butyltin are more and more limited in export and the cost is increased once due to the improvement of environmental protection requirements of European Union; the lead drier is not suitable for sulfur-containing atmosphere because it is easy to generate black sulfide with sulfur to deepen paint film. The process method for preparing the composite drier product by refining the rare earth substances in the red mud by using strong oxidation inorganic acid such as nitric acid and adding a large amount of auxiliary agents is existed, the problems of deep color, toxicity and low efficiency of the traditional drier are effectively solved by using the valence-change property and the coordination property of the rare earth elements, the whole process consumes about 15 days, the problem of nitric acid tail gas emission exists, the content of the effective rare earth elements contained in the red mud is rare, and the problems of insufficient utilization of main components such as ferric oxide and aluminum oxide in the red mud and the like are caused, so that the comprehensive economic benefit of industrial production is insufficient. The prior art utilizes rare earth waste residues to prepare the coating composite drier, but the method is directed at rare earth, is not directed at red mud, and essentially utilizes rare earth elements in the red mud, so that the drying effect only depends on the coordination property of the rare earth elements, and the drying effect is poor.
Disclosure of Invention
In order to overcome the problem that the conventional red mud cannot be utilized inefficiently, the invention aims at providing a preparation method of a drier, the invention aims at providing application of the drier, and the invention aims at providing a coating.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of a drier, which comprises the following steps: mixing red mud and organic acid, stirring for reaction, and filtering to obtain a solid serving as the drier;
the temperature of the stirring reaction is 150-550 ℃.
The drying efficiency of the red mud can be improved comprehensively and effectively by the aid of various metal ions rich in the red mud, a fixed solidifying point cannot be generated, and the red mud drying agent is suitable for various environments. The existing siccative can not effectively purify and control indoor formaldehyde, and more organic wastes can be generated in the generation process to breed bacteria for reproduction and proliferation. Iron ions rich in the red mud can effectively reduce the emission of formaldehyde, and heavy metal ions rich in the red mud have good sterilization and disinfection effects. The main metal and non-metal elements in the red mud exist in the form of Fe 2 O 3 、Al 2 O 3 、SiO 2 、Na 2 O、TiO 2 Oxides such as CaO and the like, and rare earth elements with the content lower than 1 percent besides main elements such as Fe, al, si, na, ti, ca and the like, wherein the most abundant elements in the red mud are iron and aluminum, the iron content is 5 to 50 percent, and the aluminum content is 4 to 30 percent.
The preparation mechanism of the drier of the invention is as follows:
firstly, a melting method is used for generating metal soap through acid leaching of metal, salt and metal oxide, red mud particles are in a partial melting state at high temperature, and are uniformly dispersed in organic acid under the stirring action, and the corresponding metal soap is generated through full reaction. Wherein the salt reacts (1), the metal reacts (2) and (3), and the metal oxide reacts (4).
MY+nRCOONa＝M n+ ( - OOCR) n +NaY ①
M+nRCOOH＝M n+ ( - OOCR) n +H 2 ②
M+n/2O 2 +nRCOOH＝M n+ ( - OOCR) n +H 2 O ③
MO+nRCOOH＝M n+ ( - OOCR) n +H 2 O ④
Wherein M may be Fe, al, ca, ti, zn, cu, and Y may be CO 3 2- 、SO 4 2- 。
Preferably, in the preparation method of the drier, the particle size of the red mud is 180-320 μm; more preferably, the particle size of the red mud is 200-300 μm; when the particle size does not meet the requirement, grinding pretreatment in advance is needed; the red mud with the particle size can increase the contact area, accelerate the reaction rate and reduce the reaction time.
Preferably, in the preparation method of the drier, the red mud is dried after alkali reduction, and the pH value of the dried red mud after alkali reduction is 8-9; the pH value of the red mud after the alkali reduction is determined by adding water into the dealkalized red mud according to the solid-liquid volume ratio of 1:1 and stirring the mixture until the final pH value of the clarified liquid is not changed any more; the red mud can adopt the conventional carbonization method or calcification method in the prior art; the drier prepared from the red mud after the alkali reduction can reduce the use amount of organic acid and the reaction time.
Preferably, in the preparation method of the drier, the red mud comprises the following components in percentage by mass: 6-9% of SiO 2 、2.5-5％TiO 2 、25-40％Fe 2 O 3 、16-26％Al 2 O 3 、8-13％CaSO 4 、18-26％CaCO 3 (ii) a Further preferably, the red mud comprises the following massThe components in percentage by weight are as follows: 7-8% of SiO 2 、3-4％TiO 2 、30-35％Fe 2 O 3 、18-24％Al 2 O 3 、9-12％CaSO 4 、20-24％ CaCO 3 。
Preferably, in the preparation method of the drier, after stirring and reacting, cooling is carried out, saturated salt water is added, and the solid product is obtained by separating out the metal soap due to the reduction of the solubility, and the drier is used.
Preferably, in the preparation method of the drier, the organic acid comprises at least one of naphthenic acid, isooctanoic acid, linoleic acid and tea acid.
Preferably, in the preparation method of the drier, the mass ratio of the organic acid to the red mud is not less than 2:1; further preferably, the mass ratio of the organic acid to the red mud is not less than 4:1; still further preferably, the mass ratio of the organic acid to the red mud is not less than 5:1.
Preferably, the preparation method of the drier has the temperature of stirring reaction of 350-550 ℃; further preferably, the temperature of the stirring reaction is 400-500 ℃; still more preferably, the temperature of the stirred reaction is 450 ℃.
Preferably, the preparation method of the drier has the advantages that the stirring reaction time is 20-40min; further preferably, the stirring reaction time is 23-35min; still more preferably, the reaction time is 30min with stirring.
Preferably, the drier is prepared by introducing air and/or oxygen during the stirring reaction; when air or oxygen is introduced in the stirring process, the oxygen in the air can oxidize the metal simple substance to accelerate the reaction process (3).
In a second aspect, the invention provides a drier prepared by the above-mentioned method for preparing a drier.
Preferably, in the drier, the content of the iron element is 0.45-5wt%; further preferably, the content of iron element is 1.5-5wt%.
Preferably, in the drier, the content of aluminum element is 0.25-3wt%; further preferably, the content of aluminum element is 0.8 to 3wt%.
The third aspect of the invention provides the application of the drier prepared by the preparation method of the drier in preparation of sterilization and/or bacteriostasis products.
The action mechanism of the drier for sterilization and disinfection is as follows:
the novel red mud-based drier has more excellent sterilization and disinfection effects compared with the existing drier due to the rich antibacterial metal ions. Certain metal ions M (M = Zn) in ROOM 2+ ，Cu 2+ ，Fe 3+ ) Has broad-spectrum antibacterial property, and can kill bacteria and fungi. Meanwhile, the red mud-based drier disclosed by the invention has good heat resistance and dispersibility, and still has a good bactericidal effect in summer where fungi are easy to breed. The sterilization mechanism can be divided into three processes of adsorption, membrane damage and intracellular enzyme system destruction.
The first step is as follows: and (4) an adsorption process. The surface of the cell membrane of bacteria and fungi is negatively charged (mainly by-COO) - ，-O-PO3 - ，-S - Plasma generation), positively charged metal cations are adsorbed by cell membranes by coulomb attraction and with the help of certain transport substances on the cell surface;
the second step: and (4) a membrane damage process. The metal ions acting on the surface of the cell membrane gradually replace the positions of nontoxic cations on the surface of the cell membrane along with the increasing absorption amount and are combined with proteins or other anionic groups to destroy the function of the cell membrane, so that the cytoplasm flows outwards, the cell metabolism is not facilitated, and the cell death is caused after serious interference;
the third step: after the heavy metal ions are transported to the interior of the cell, the heavy metal ions can be combined with-NH on intracellular protein 3 The group-SH group reacts with the group-COOH to destroy the high-order structure of the protein, so that the protein loses the due biological function. Acyl carrier, coenzyme A containing sulfhydryl compound and hydrogen acceptor dihydrolipoic acid in the ketonic acid oxidase system in the energy synthesis system are all extremely sensitive to metal ions. In general, metal ions entering the interior of cells can interfere with the action of various enzymes, causing them to lose their intended biological functions, and ultimately leading to cell death.
The mechanism of bactericidal action can also be explained as: m can be O in air 2 Generating hydroxyl radicals (HO.) andhigh active oxygen anion (O) 2- ) Providing active catalytic sites and thus oxidative stress, reducing the reproductive capacity of the bacteria, leading to their elimination.
The fourth aspect of the invention provides an application of the drier prepared by the preparation method of the drier in preparation of aldehyde degradation products.
In a fifth aspect, the invention provides a coating, the components of which comprise the above-mentioned drier.
Preferably, in the coating, the mass percent of the drier is 1-2.5%; further preferably, the mass percent of the drier is 1.2-2.1%; still more preferably, the mass percentage of the drier is 1.4-1.6%.
Preferably, the coating further comprises a base coating, and the base coating comprises at least one of NC paint, PU paint and PE paint.
The action process of the drier in the drying and curing of the coating is divided into the following 4 steps:
(1) During the induction period, the coating is decomposed into free radicals under the action of oxygen, and the reaction is as follows:
R-H+O 2 ＝R·+H·
the reaction in the process is slow due to the fact that the coating contains antioxidants, and oxygen in the air is preferentially combined. After the metal soap is added, the existence of the antioxidant in the coating can be greatly reduced due to the fact that the metal soap is rich in high-valence metal ions and has strong oxidizing property, besides, the chelate of iron and copper can react with the antioxidant to generate free radicals, chain reaction is initiated through the free radicals to generate more free radicals, and therefore the rate of induction reaction can be accelerated.
(2) And (4) generating peroxide, wherein free radicals generated in the induction period are combined with oxygen in the air to generate the peroxide. The reaction is as follows:
R·+O 2 +H·＝ROOH
after the metal soap is added, the metal cations can absorb oxygen in the air to provide more oxygen for the generation of peroxide, and the reaction is as follows:
M n+ +O 2 ＝M n+ -O-O·
M n+ -O-O·+R·+H·＝ROOH+M n+
wherein M may be Ca, al, fe, cu, zn, ti, sc, etc.
(3) Peroxides decompose and, because of their instability, spontaneously decompose into free radicals.
ROOH＝RO·+·OH
2ROOH＝ROO·+RO·+H 2 O
However, metal ions (Ca) 2+ 、Al 3+ 、Fe 3+ 、Cu 2+ 、Zn 2+ 、Ti 4+ 、Sc 2+ ) This reaction can be catalyzed, greatly accelerating the rate of peroxide cleavage, and thus faster generation of free radicals. Wherein, the iron ion is mainly used for surface drying, the aluminum ion is mainly used for internal drying, and the calcium ion is mainly used for drying. The drying effect of various metal ions is combined with each other, so that the drying rate and the drying effect are greatly accelerated.
(4) The radicals crosslink with each other. Through the three steps, the free radicals in the system are R, RO and OO, and the radicals are combined by mutual collision to finally form various crosslinking products.
R·+R·＝R-R
R·+RO·＝R-OR
R·+ROO·＝R-O-O-R
RO·+RO·＝R-O-O-R
RO·+ROO·＝R-O-R+O 2
ROO·+ROO·＝R-O-O-R+O 2
Form C-C (carbon-carbon bond), C-O-C (ether bond), C-O-C (peroxy bond), the individual organic groups crosslink with one another, leading to hardening of the coating. In addition, a large amount of RO is generated in the reaction, and a part of RO generates beta shearing reaction under the action of oxygen to generate aldehyde substances. Therefore, a large amount of harmful substances such as formaldehyde and the like can be released in the paint curing process, and the paint is harmful to human bodies. The following reactions:
RO·+O 2 →R`CHO
after the drier is added, the iron ions (Fe) are peculiar to the drier 3+ ) The aldehyde substance has strong oxidizability, can continuously oxidize the generated aldehyde substance into carboxylic acid substances, and then the carboxylic acid substances can form hydrogen bonds, so that the boiling point of the carboxylic acid substances is far higher than that of the aldehyde substance, and the carboxylic acid substances are not easy to volatilize under normal conditions, thereby achieving the effect of reducing the release of the aldehyde substance.
The invention has the beneficial effects that:
the invention utilizes the red mud as a raw material, and the red mud is recycled as solid waste, not only contains rare earth elements but also contains a large amount of heavy metal ions, can effectively perform the drying action, realizes the effect of drying a large amount of formaldehyde in a short time, and can effectively reduce the emission of formaldehyde due to rich iron ions, thereby having great improvement compared with the prior dryer which can not effectively reduce the emission of formaldehyde, and having good sterilization effect due to the special complex environment in the red mud. Therefore, the method has great significance as an effective method for comprehensively utilizing the red mud, and the effect of comprehensively utilizing the red mud as the raw material for preparing the drier is far better than the single effect of preparing the composite drier for the coating by only utilizing the rare earth waste residue.
The drier prepared from the red mud is treated by acidification and saponification, so that polluting substances are not generated, the preparation time is greatly reduced, heavy metal ion components, rare earth element components and special environmental factors thereof are utilized to the maximum extent, and multi-angle omnibearing efficient drying is achieved.
Detailed Description
The following detailed description of the embodiments of the present invention is provided for the purpose of illustration only and is not to be construed as limiting the invention.
The present invention will be described in further detail with reference to specific examples.
The starting materials, reagents or equipment used in the examples were, unless otherwise specified, either commercially available from conventional sources or available by methods known in the art. Unless otherwise indicated, the testing or testing methods are conventional in the art.
The red mud used in the following examples is the red mud after alkali reduction, and the main component table of the red mud is shown in table 1 below:
TABLE 1 Red mud composition table (wt%)
| SiO 2 | TiO 2 | Fe 2 O 3 | Al 2 O 3 | CaSO 4 | CaCO 3 |
| 7.25 | 3.45 | 33.3 | 21.89 | 10.69 | 22.31 |
Example 1
The embodiment provides a preparation method of a drier, which specifically comprises the following steps:
adding the red mud subjected to alkali reduction into a ball mill, and treating to obtain alkali-reduced red mud powder with the particle size of about 200-300 microns; naphthenic acid and red mud powder (the mass ratio of the organic acid to the red mud is 5:1) are added into a rotary tube furnace, the stirring speed is 40-50r/min, and the stirring is carried out for 30min at 150 ℃, 250 ℃, 350 ℃, 450 ℃ and 550 ℃. The mixture after reaction is filtered, washed with saturated brine to obtain solid organic acid soap.
Uniformly mixing an organic acid soap and a coating (NC paint) according to a proportion of 12g/kg, smearing the mixture on the inner wall of a semi-closed experimental box (3m3m3m3m3m), carrying out short-term drying monitoring, wherein the test results of surface drying and actual drying experiments at different temperatures are shown in the following table 2; carrying out titration experiment on organic acid soap obtained by reaction at different temperatures, and calculating to obtain Fe 3+ 、Al 3+ The mass fractions are shown in table 3.
Mixing organic acid soap and NC paint uniformly according to a proportion of 12g/kg, smearing on the inner wall of a semi-closed experiment box (3 m x 3 m), monitoring the aldehyde content for a long time, and measuring the aldehyde content by the following method: according to the sampling time, a formaldehyde detector is placed in the experimental box, the reading number is the formaldehyde content after 10min, and the test results are shown in the following table 4.
TABLE 2
| Reaction temperature | Time to surface dry | Actual drying time |
| 150℃ | 90min | 33h |
| 250℃ | 82min | 26h |
| 350℃ | 71min | 20h |
| 450℃ | 62min | 16h |
| 550℃ | 73min | 21h |
TABLE 3
| Reaction temperature | Fe 3+ | Al 3+ |
| 150℃ | 0.45％ | 0.25％ |
| 250℃ | 0.97％ | 0.55％ |
| 350℃ | 2.07％ | 1.07％ |
| 450℃ | 4.00％ | 2.25％ |
| 550℃ | 1.65％ | 0.88％ |
TABLE 4
| Reaction temperature | 3d | 6d |
| 150℃ | 0.26mg/m 3 | 0.30mg/m 3 |
| 250℃ | 0.24mg/m 3 | 0.25mg/m 3 |
| 350℃ | 0.21mg/m 3 | 0.17mg/m 3 |
| 450℃ | 0.19mg/m 3 | 0.11mg/m 3 |
| 550℃ | 0.22mg/m 3 | 0.18mg/m 3 |
Example 2
Controlling the reaction temperatureThe temperature is 450 ℃, air is introduced into the tubular furnace in the reaction process, and the volume ratio of the gas to the reaction liquid =20:1, the rest of the experimental conditions were the same as in example 1. Titrating the prepared organic acid soap, and determining Fe 3+ 、Al 3 + The results of mass fraction are shown in table 5 below, wherein the data in table 5 without air admission are the data for the product prepared in example 1.
TABLE 5
| Fe 3+ | Al 3+ | |
| Introducing air | 4.43％ | 2.52％ |
| Without introducing air | 4.00％ | 2.25％ |
As can be seen from the data in Table 5 above, the metal leaching rate can be improved by introducing air.
Example 3
The organic acid soap prepared in example 2 was added to the paints a (NC paint), B (PU paint) and C (PE paint), and the paints doped with the organic acid soap were subjected to a dry measurement test in a semi-closed box (3m × 3m), and the data of the doped amount of the different organic acid soaps are shown in the following table 6.
TABLE 6
| Adding amount of | A | B | C |
| 3g/kg | 34h solid stem | 36h solid stem | 31h dried |
| 6g/kg | 27h solid stem | 32h solid stem | 24h solid stem |
| 9g/kg | 21h of dried bean curd | 24h solid stem | 18h of dried bean curd |
| 12g/kg | 15h solid dry | 15h solid dry | 13h solid stem |
| 15g/kg | 13h solid stem | 14h of dried bean curd | 13h solid stem |
| 18g/kg | 14h of dried bean curd | 14h of dried bean curd | 14h of dried bean curd |
| 21g/kg | 15h solid dry | 14h of dried bean curd | 17h of dried bean curd |
Example 4
The organic acid soap prepared in example 2 was added to a paint (NC paint) in an amount of 15g/kg as an experimental group; NC paint without organic acid soap is adopted as a control group; surface and actual dry measurements were made in a semi-enclosed box (3mx3mx3m); simultaneously measuring the formaldehyde content of the experimental group and the control group; the results of the dry test of the experimental group and the control group are shown in table 7 below, the results of the dry test of the experimental group and the control group are shown in table 8 below, and the results of the formaldehyde content test of the experimental group and the control group are shown in table 9 below.
TABLE 7
| Sampling time | Control group | Experimental group |
| 30min | Not dried on the surface | Not dried on the surface |
| 60min | Not dried on the surface | Watch stem |
| 90min | Watch stem | Watch stem |
TABLE 8
| Sampling time | Control group | Experimental group |
| 6h | Dried bean curd | Immature dried bean curd |
| 12h | Dried bean curd | Dried bean curd |
| 18h | Immature dried bean curd | Dried bean curd |
| 24h | Dried bean curd | Dried bean curd |
TABLE 9
| Sampling time | Control group | Experimental group |
| 1d | 0.19mg/m 3 | 0.15mg/m 3 |
| 2d | 0.22mg/m 3 | 0.17mg/m 3 |
| 3d | 0.27mg/m 3 | 0.18mg/m 3 |
| 4d | 0.35mg/m 3 | 0.17mg/m 3 |
| 5d | 0.36mg/m 3 | 0.14mg/m 3 |
| 6d | 0.34mg/m 3 | 0.11mg/m 3 |
| 7d | 0.30mg/m 3 | 0.09mg/m 3 |
The data in tables 7 to 9 above show that the dryer of the present invention is excellent in both the drying effect and the formaldehyde-removing effect.
Although the present invention has been described with reference to specific embodiments, it should be understood that the present invention is not limited to the above embodiments, and any modifications, equivalents, improvements and the like, which fall within the spirit and principle of the present invention, should be construed as being included in the scope of the present invention.
Claims (10)
1. The preparation method of the drier is characterized by comprising the following steps: mixing red mud and organic acid, stirring for reaction, and filtering to obtain a solid serving as the drier;
the temperature of the stirring reaction is 150-550 ℃.
2. The process for preparing a drier according to claim 1, wherein the temperature of the stirring reaction is 350 to 550 ℃.
3. The preparation method of the drier according to claim 1, wherein the particle size of the red mud is 180 to 320 μm.
4. The method for preparing a drier according to claim 1, wherein air and/or oxygen is introduced during the stirring reaction.
5. A dryer prepared by the method of any one of claims 1 to 4.
6. Drier according to claim 5, wherein the content of iron element in the drier is 0.45-5wt%; the aluminum element content in the drier is 0.25-3wt%.
7. Use of a dryer prepared by the process of any one of claims 1 to 4 in the preparation of a bactericidal and/or bacteriostatic product.
8. Use of a drier prepared by the process of any one of claims 1 to 4 in the preparation of aldehyde degradation products.
9. A coating, characterized in that the components of the coating comprise a drier as claimed in claim 5 or 6.
10. The coating of claim 9, wherein the mass percent of the drier in the coating is 1-2.5%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633819A (en) * | 2008-07-23 | 2010-01-27 | 甘肃稀土新材料股份有限公司 | Preparation method of high efficient rare-earth paint drier |
| CN109943112A (en) * | 2019-03-26 | 2019-06-28 | 安徽工业大学 | A kind of environmental photocatalysis fireproof coating and preparation method thereof for air cleaning |
| CN110144133A (en) * | 2019-04-10 | 2019-08-20 | 浙江迈实科技有限公司 | A kind of preparation process of dryer and its application |
| US20200299806A1 (en) * | 2016-03-25 | 2020-09-24 | Fakon Vállalkozási Kft. | Process for processing red mud and producing rare-earth metal salts |
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- 2022-11-07 CN CN202211383280.XA patent/CN115785817A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633819A (en) * | 2008-07-23 | 2010-01-27 | 甘肃稀土新材料股份有限公司 | Preparation method of high efficient rare-earth paint drier |
| US20200299806A1 (en) * | 2016-03-25 | 2020-09-24 | Fakon Vállalkozási Kft. | Process for processing red mud and producing rare-earth metal salts |
| CN109943112A (en) * | 2019-03-26 | 2019-06-28 | 安徽工业大学 | A kind of environmental photocatalysis fireproof coating and preparation method thereof for air cleaning |
| CN110144133A (en) * | 2019-04-10 | 2019-08-20 | 浙江迈实科技有限公司 | A kind of preparation process of dryer and its application |
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