CN111269606B - High-purity high-thickening easy-to-disperse nano montmorillonite used in water-based paint field and preparation method thereof - Google Patents
High-purity high-thickening easy-to-disperse nano montmorillonite used in water-based paint field and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/43—Thickening agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
Abstract
The invention relates to a preparation method of nano montmorillonite for a water-based paint, belonging to the technical field of bentonite modification. The method comprises the following steps: 1) uniformly mixing calcium bentonite mineral powder, a sodium modifier and a dispersant, adding water, uniformly mixing, stacking for more than 72 hours, drying and crushing; 2) adding water, stirring to prepare pulp, and centrifuging; 3) adjusting the pH value to 8-10, and stirring for reaction; 4) adding a modifier, and stirring at a constant temperature of 20-70 ℃; 5) adjusting the pH value to 7-9, and stirring at a constant temperature of 20-70 ℃; 6) and (5) drying. According to the invention, the sodium modification is carried out on the calcium bentonite by adopting a stacking treatment process, and the low-molecular-weight sodium polyacrylate is introduced in the modification process, so that the sodium modification is promoted and the subsequent pulping step is facilitated; the charge on the end face of the montmorillonite sheet is controlled, and the dispersion performance of the montmorillonite is obviously improved; and a hydrophilic organic polymer chain segment is introduced, so that the thickening capacity of the montmorillonite is greatly improved.
Description
Technical Field
The invention relates to a preparation method of nano montmorillonite for a water-based paint, belonging to the technical field of bentonite modification.
Background
Montmorillonite is the main mineral component of bentonite, and the microstructure is 2: the type 1 lamellar structure, the thickness of the individual layers is around 1nm, and is therefore also referred to as natural two-dimensional nanomaterial. Montmorillonite layers are naturally electronegative and have exchangeable cations from layer to layer. Montmorillonite is generally classified into calcium-based montmorillonite, sodium-based montmorillonite, hydrido montmorillonite and the like according to the difference in exchangeable cation species between montmorillonite layers. The physical and chemical properties of different types of montmorillonite are obviously different, and the application fields are different. For example, calcium-based montmorillonite has the characteristic of high water absorption rate and is commonly used as a drying agent; the hydrogen-based montmorillonite has certain catalytic and decolorizing capabilities and is commonly used as a catalyst carrier or a decolorizing agent; the sodium montmorillonite can be dispersed in water to form colloid with thixotropic property, and is commonly used as rheological additive.
The bentonite in nature mainly comprises minerals such as montmorillonite, quartz, feldspar, calcite, kaolinite, zeolite, illite and the like. The content of montmorillonite in bentonite ore beds with different producing areas and different causes and the types of associated minerals have certain difference. Generally, the higher the montmorillonite content, the better the deposit quality, and the better the application effect. The preparation of high-purity montmorillonite is always a hot spot in the field of deep processing of montmorillonite. The purification of the montmorillonite is generally realized by separating the montmorillonite and impurity minerals in an aqueous medium by utilizing the gravity settling principle and the specific gravity difference of the montmorillonite and the impurity minerals to obtain the montmorillonite with higher purity. The sodium-based montmorillonite has the best suspension property, so a sodium modification modifier or a dispersing agent is generally added in the purification process to carry out sodium modification on the montmorillonite, the suspension property of the montmorillonite is improved, and the high-purity montmorillonite is obtained after separation and purification.
Patent No. 200410039840.5 discloses a method for preparing a high-purity inorganic gel of magnesium aluminum silicate. The method takes magnesium-lithium soapstone, bentonite and attapulgite as raw materials, the raw ore is crushed, water is added and a viscosity reducer is added to be stirred to prepare slurry, the slurry is centrifugally separated and purified, iron is removed by strong magnetic separation, and A type modifiers (lithium sulfate and potassium sulfate) are added; adding B type modifier (magnesium sulfate and aluminum sulfate) for modification, centrifuging and concentrating, filtering and washing the ore pulp by using an alcohol preparation, and then drying to obtain the product.
Patent No. 200710004960.5 discloses a method for producing sodium bentonite from calcium bentonite. The method comprises the steps of adding crushed calcium bentonite into a sodium hexametaphosphate aqueous solution, uniformly stirring, adding a saturated sodium carbonate solution, stirring and aging, heating and modifying, dispersing at a high speed, removing impurities by siphoning, centrifugally purifying, flocculating and dehydrating and the like to obtain the high-quality sodium bentonite. The flocculation dehydration adopts chitosan acetic acid aqueous solution.
Patent No. 200510120588.5 discloses a method for producing high-purity montmorillonite. The method comprises the steps of uniformly mixing bentonite ore powder, sodium salt powder and urea powder to prepare dispersive bentonite with expansion multiple of more than 50ml/g, adding water, stirring for pulping, performing centrifugal separation to obtain high-purity montmorillonite slurry, then adjusting the pH of the slurry to 2-4 by using acid, adding sodium hydrosulfite for removing iron, adding polyacrylamide for flocculation and dehydration, washing, drying and crushing to obtain the high-purity montmorillonite powder.
The invention patent with the patent number of 200710067840.X discloses a method for superfine purification of montmorillonite. The method comprises pulping bentonite raw ore and water according to a certain proportion, soaking, stirring, pulping, sieving to remove large particle impurities, then placing into superfine stripping equipment for superfine stripping, then removing fine sand by classification to obtain high-purity superfine slurry, finally dehydrating, drying and pulverizing to obtain high-purity superfine montmorillonite.
The invention patent document with application number 201210501810.6 discloses a method for separating and purifying montmorillonite from calcium bentonite. The method comprises the steps of preparing calcium bentonite into suspension, adding a sodium carbonate dispersant, adjusting the pH value of the suspension, separating and purifying, adjusting the slurry to a specific pH value, performing ultrasonic treatment, and separating to obtain the high-purity montmorillonite.
The invention patent document with application number 201810946424.5 discloses a production process for refining montmorillonite by using bentonite. After bentonite is pulped, coarse impurities are removed through sieving, modifiers are modified (sodium carbonate, lithium carbonate, sodium citrate and EDTA), viscosity reducers (sodium pyrophosphate, sodium hexametaphosphate, sodium tripolyphosphate and polycarboxylate modified pyrophosphate) are added, then filtration and separation are carried out to obtain slurry with high purity, flocculating is carried out by adding flocculant (magnesium chloride), centrifugal dehydration is carried out to obtain high-solid-content slurry, pH is adjusted to 6-7 through acid, and soluble impurities are removed through washing; and adding the flocculating agent again for concentration to obtain high-solid-content slurry, diluting for the second time, adding the viscosity reducer, stripping by a stripping machine, concentrating for the third time, and spray drying.
In the patent, the purification method of the montmorillonite is different, the montmorillonite is prepared into sodium-based montmorillonite or lithium-based montmorillonite with better suspension property by adopting a modifier, then the montmorillonite slurry with high purity is obtained by centrifugal separation, and then the slurry is subjected to stripping/ultrasonic treatment, so that the stripping effect of the montmorillonite in water is improved, fine particle impurities are further separated, and the purity of the montmorillonite is improved; then the solid content of the slurry is improved by methods of alcohol washing, flocculation, concentration, dehydration and the like, and the high-purity montmorillonite product is obtained by drying and crushing. However, the addition of auxiliaries such as viscosity reducer and flocculant can reduce the thickening capacity of montmorillonite after secondary dispersion, thereby reducing the use performance of montmorillonite as thickening rheological aid.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of high-purity high-thickening easy-dispersion nano montmorillonite used in the field of water-based paint, and the method for preparing the high-purity high-thickening easy-dispersion nano montmorillonite can obviously improve the thickening capacity of gel formed by dispersion of montmorillonite in water and has good thickening and thixotropic properties in the fields of water-based paint and the like.
The technical scheme for solving the problems is as follows:
a preparation method of high-purity high-thickening easy-dispersion nano montmorillonite used in the field of water-based paint comprises the following steps:
1) uniformly mixing calcium-based bentonite mineral powder, a sodium modifier and a dispersant, adding water accounting for 20-30% of the mass of the bentonite, uniformly mixing, stacking for more than 72 hours, drying and crushing to obtain sodium-based bentonite mineral powder;
2) adding water into sodium bentonite ore powder, stirring for pulping, and centrifugally purifying to obtain suspension slurry with the montmorillonite content of more than 90 wt%;
3) adjusting the pH value of the suspension slurry to 8-10 by using acid, and stirring and reacting for 0.5-5 hours;
4) adding a modifier to carry out modification treatment on the montmorillonite, and stirring for 1-10 hours at a constant temperature of 20-70 ℃;
5) adjusting the pH value of the slurry obtained in the step 4) to 7-9 by using alkali, and stirring for 1-2 hours at a constant temperature of 20-70 ℃;
6) drying the slurry obtained in the step 5) to obtain the high-purity high-thickening easy-to-disperse nano montmorillonite.
Preferably, the sodium modifier in the step 1) is one or more selected from sodium carbonate, sodium fluoride and sodium oxalate, and the dosage of the sodium modifier is 0.5 to 2.0 times of the cation exchange capacity of the bentonite, and more preferably 0.8 to 1.5 times.
Preferably, the dispersant in the step 1) is polyacrylate, the molecular weight is 500-5000, and the dosage of the dispersant is 0.5-2% of the mass of the bentonite.
Preferably, the solid content of the slurry in the step 2) is 2-15%, and more preferably 5-8%.
Preferably, the acid in step 3) is selected from one or more of hydrochloric acid, sulfuric acid and phosphoric acid; further preferred is sulfuric acid, and sulfuric acid should be used after dilution, which is more advantageous for the control of the slurry pH.
Preferably, the modifier in the step 4) is selected from one or two of polyacrylic acid-carboxyvinyl copolymer and polyacrylate; the amount of the modifier is 0.1-10% by mass of the montmorillonite, and more preferably 0.5-5%.
Preferably, the alkali in step 5) is selected from one or more of sodium hydroxide, magnesium hydroxide and calcium hydroxide.
Preferably, the drying process in step 6) is one selected from spray drying, roller film drying, and hot air oven drying.
In the technical scheme of the invention, the step 1) aims to convert calcium bentonite into sodium bentonite, the addition of the dispersing agent is favorable for full sodium modification, and meanwhile, the dispersing agent can reduce the viscosity of the slurry in the subsequent pulping step and is favorable for purification of montmorillonite.
In the step 2) of the invention, when the sodium bentonite is used for pulping, the viscosity of the slurry is improved along with the increase of the concentration, the solid content of the slurry is controlled properly, and the method has a key significance on the purification purity of the montmorillonite. Therefore, the solid content of the slurry in the step 2) is 2-15%, preferably 5-8%.
The purpose of the step 3) is to control the pH of the purified slurry, and the pH control range is 8-10. This step has a bond impact on the ease of dispersion of the montmorillonite product.
The step 4) of the invention aims to introduce a hydrophilic organic polymer chain segment into the high-purity montmorillonite slurry, so that a montmorillonite sheet layer is adsorbed on the polymer chain segment to form an organic/inorganic composite network structure, and the thickening capability of montmorillonite is improved.
The purpose of step 5) according to the invention is to adjust the slurry pH between 7 and 9, at which pH the binding of the organic components to the smectite in step 4 is favoured.
The drying process of step 6) of the invention does not carry out concentration or flocculation dehydration treatment on the slurry before drying, and aims to maintain the dispersing and thickening capability of the montmorillonite.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the sodium modification is carried out on the calcium bentonite by adopting a stacking treatment process, and the low-molecular-weight sodium polyacrylate is introduced in the modification process, so that the sodium modification is promoted and the subsequent pulping step is facilitated; the energy consumption in the sodium treatment process is low, and the process is simple and easy to implement.
2. The invention regulates and controls the pH value of the purified sodium bentonite slurry, controls the charge of the sheet end face of the montmorillonite and obviously improves the dispersion performance of the montmorillonite.
3. In the step 4), the thickening capacity of the montmorillonite can be greatly improved by introducing the hydrophilic organic polymer chain segment.
4. The invention, step 6), adopts the direct slurry drying process, so that the combination of the montmorillonite sheet layer and the organic polymer chain segment is not damaged, and the thickening capability of the finished product is not lost.
Detailed description of the invention
In order to enhance the understanding of the present invention, the present invention will be described in further detail with reference to the following examples. The examples are only for explaining the present invention and do not constitute a limitation to the scope of protection of the present invention.
Example 1:
and (3) carrying out sodium treatment on the calcium bentonite. 300kg of calcium bentonite (water content: 12%; Cation Exchange Capacity (CEC): 60mmol/100g of soil) was weighed, 10kg of sodium carbonate (1.5 times CEC) was added, 2.6kg of sodium polyacrylate (molecular weight 5000) (1% dry soil) was added, mixed well in a mixer, then 90kg of water was added, mixed well again, stacked for 1 month, dried, and pulverized to obtain sodium bentonite powder for use.
Example 2:
and (3) carrying out sodium treatment on the calcium bentonite. 300kg of calcium bentonite (water content: 12%; Cation Exchange Capacity (CEC): 60mmol/100g of soil) is weighed, 10kg of sodium carbonate (1.5 times CEC) is added to the mixture and mixed in a mixer, then 90kg of water is added to the mixture and mixed uniformly again, and the mixture is piled up for 1 month, dried and crushed to obtain sodium bentonite powder for standby.
Example 3:
purifying montmorillonite. 10kg of the sodium bentonite powder obtained in the example 1 is slowly added into 200kg of water, fully stirred and dispersed, kept stand for 24h and centrifugally purified to obtain high-purity montmorillonite slurry. The slurry was tested for solid content and montmorillonite content (montmorillonite content is characterized by the amount of blue absorption). Test results show that the solid content of the slurry is 3.5%, and the blue absorption amount is as follows: 45 percent. And taking part of the purified slurry to directly spray and dry to obtain a high-purity montmorillonite sample, wherein the label is FH-1.
Example 4:
purifying montmorillonite. 10kg of the sodium bentonite powder obtained in the example 2 is slowly added into 200kg of water, fully stirred and dispersed, kept stand for 24h and centrifugally purified to obtain high-purity montmorillonite slurry. The slurry was tested for solid content and montmorillonite content (montmorillonite content is characterized by the amount of blue absorption). Test results show that the solid content of the slurry is 3.0%, and the blue absorption amount is as follows: 40 percent. And taking part of the purified slurry to directly spray and dry to obtain a high-purity montmorillonite sample, wherein the label is FH-2.
Example 5:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 3, testing the pH value to be 10.56, adding dilute sulfuric acid to adjust the pH value of the slurry to be 9.5, and stirring and dispersing for 2h at room temperature; adding a polyacrylic acid-carboxyl group copolymer: 7g, stirring for 2 hours at the constant temperature of 50 ℃; the test slurry pH was 7.56; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 50 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample with FH-3 label.
Example 6:
and (5) purifying the montmorillonite slurry for modification treatment. 10kg of the montmorillonite purified slurry of example 3 was taken, tested for pH10.56, and polyacrylic acid-hydroxyethyl copolymer was added: 7g, stirring for 2 hours at the constant temperature of 50 ℃; the test slurry pH was 7.56; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 50 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample, labeled as FH-4.
Example 7:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 3, testing the pH value to be 10.56, adding dilute sulfuric acid to adjust the pH value of the slurry to be 8, and stirring and dispersing for 2h at room temperature; adding polyacrylic acid-hydroxyethyl copolymer: 7g, stirring for 2 hours at the constant temperature of 50 ℃; the test slurry pH was 7.56; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 50 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample with FH-5 label.
Example 8:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 3, testing the pH value to be 10.56, adding dilute sulfuric acid to adjust the pH value of the slurry to be 9.5, and stirring and dispersing for 2h at room temperature; adding polyacrylic acid-carboxyvinyl copolymer: 5g, stirring for 2 hours at a constant temperature of 50 ℃; the test slurry pH was 8.0; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 50 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample with FH-6 label.
Example 9:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 3, testing the pH value to be 10.56, adding dilute sulfuric acid to adjust the pH value of the slurry to be 9.5, and stirring and dispersing for 2h at room temperature; adding polyacrylic acid-carboxyvinyl copolymer: 7g, stirring for 2 hours at the constant temperature of 50 ℃; the test slurry pH was 8.0; spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample, and marking as FH-7.
Example 10:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 3, testing the pH value to be 10.56, adding dilute sulfuric acid to adjust the pH value of the slurry to be 7.5, and stirring and dispersing for 2h at room temperature; adding polyacrylic acid-carboxyvinyl copolymer: 5g, stirring for 2 hours at a constant temperature of 50 ℃; the test slurry pH was 7.0; spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample, and marking as FH-8.
Example 11:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 4, testing the pH value to be 10.24, adding dilute sulfuric acid to adjust the pH value of the slurry to be 9.5, and stirring and dispersing for 2h at room temperature; adding polyacrylic acid-carboxyvinyl copolymer: 6g, stirring for 2 hours at a constant temperature of 50 ℃; the test slurry pH was 8.2; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 50 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample with FH-9 label.
Example 12:
and (5) purifying the montmorillonite slurry for modification treatment. Taking 10kg of the montmorillonite purified slurry in the embodiment 4, testing the pH value to be 10.24, adding dilute sulfuric acid to adjust the pH value of the slurry to be 9.5, and stirring and dispersing for 2h at room temperature; adding polyacrylate: 6g, stirring for 2 hours at a constant temperature of 70 ℃; the test slurry pH was 8.2; adding sodium hydroxide solution to adjust pH to 9.0, stirring at 70 deg.C for 1h, and spray drying to obtain high-purity high-viscosity easily dispersible montmorillonite sample with FH-10 label.
Sample evaluation protocol: weighing 190g of distilled water in a clean and dry container, placing the container under a high-speed stirrer, immersing a dispersion disc to 1/3 underwater, starting the high-speed stirrer, regulating the rotating speed to 500rpm, slowly adding 10g of weighed sample under the stirring condition, then increasing the stirring rotating speed to 2000rpm, stirring for 15 minutes, stopping and removing the container, and placing the container in a DV2T digital rotational viscometer to test the viscosity. The test results are shown in the following table.
The sodium bentonite powders prepared in example 1 and example 2 show a significant difference in the slurry preparation process. The sample prepared in example 1 was able to disperse quickly into water with essentially no undispersed particles appearing during agitation. When the sample prepared in example 2 is dispersed in water, non-dispersed particles are easily formed and adhered to the inner walls of the stirring rod and the stirring cylinder, and the sample needs to be cleaned manually. And under the condition of the same dispersion concentration, the viscosity value of the sample prepared in the example 2 after being dispersed in water is obviously higher than that of the sample prepared in the example 1.
Table, comparison of data for samples prepared in examples dispersed in water to 5% colloid
Claims (4)
1. A preparation method of high-purity high-thickening easy-dispersion nano montmorillonite used in the field of water-based paint comprises the following steps:
1) uniformly mixing calcium-based bentonite mineral powder, a sodium modifier and a dispersant, adding water accounting for 20-30% of the mass of the bentonite, uniformly mixing, stacking for more than 72 hours, drying and crushing to obtain sodium-based bentonite mineral powder;
2) adding water into sodium bentonite ore powder, stirring for pulping, and centrifugally purifying to obtain suspension slurry with the montmorillonite content of more than 90 wt%;
3) adjusting the pH value of the suspension slurry to 8-10 by using acid, and stirring and reacting for 0.5-5 hours;
4) adding a modifier to carry out modification treatment on the montmorillonite, and stirring for 1-10 hours at a constant temperature of 20-70 ℃;
5) adjusting the pH value of the slurry obtained in the step 4) to 7-9 by using alkali, and stirring for 1-2 hours at a constant temperature of 20-70 ℃;
6) drying the slurry obtained in the step 5) to obtain high-purity high-thickening easily-dispersible nano montmorillonite;
the sodium modifier in the step 1) is selected from one or more of sodium carbonate, sodium fluoride and sodium oxalate, and the dosage of the sodium modifier is 0.5-2.0 times of the cation exchange capacity of the bentonite;
the solid content of the slurry in the step 2) is 2-15%;
the modifier in the step 4) is selected from one or two of polyacrylic acid-carboxyl ethylene copolymer and polyacrylate; the using amount of the modifier is 0.1-10% of the mass of the montmorillonite;
the drying in the step 6) is directly drying the slurry, and the slurry is not subjected to concentration or flocculation dehydration treatment before the drying, and is selected from one of spray drying, roller film drying and hot air oven drying.
2. The preparation method of the high-purity high-thickening easy-dispersing nano montmorillonite used in the field of water-based paint according to claim 1 is characterized in that: the dispersant in the step 1) is polyacrylate, the molecular weight is 500-5000, and the dosage of the dispersant is 0.5-2% of the mass of the bentonite.
3. The preparation method of the high-purity high-thickening easy-dispersing nano montmorillonite used in the field of water-based paint according to claim 1 is characterized in that: the acid in the step 3) is selected from one or more of hydrochloric acid, sulfuric acid and phosphoric acid.
4. The preparation method of the high-purity high-thickening easy-dispersing nano montmorillonite used in the field of water-based paint according to claim 1 is characterized in that: the alkali in the step 5) is selected from one or two of sodium hydroxide and calcium hydroxide.
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| CN113402904A (en) * | 2021-06-08 | 2021-09-17 | 浙江丰虹新材料股份有限公司 | Preparation method of low-viscosity composite clay thixotropic agent |
| CN113769704B (en) * | 2021-10-26 | 2023-10-20 | 内蒙古宁城天宇膨润土科技有限公司 | Bentonite for treating paint waste water and its preparation method |
| WO2023194321A1 (en) | 2022-04-06 | 2023-10-12 | Byk-Chemie Gmbh | Natural sodium bentonite clay with improved rheological properties |
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| EP2380850A1 (en) * | 2009-01-08 | 2011-10-26 | Hailisheng Pharmaceutical Co., Ltd | Modified sodium-montmorillonite, preparing method and uses thereof |
| CN104760968A (en) * | 2015-03-26 | 2015-07-08 | 黄山市白岳活性白土有限公司 | Preparation method of nanoscale organobentonite |
| CN107399742A (en) * | 2017-08-25 | 2017-11-28 | 芜湖飞尚非金属材料有限公司 | A kind of preparation technology of ultra-fine montmorillonite |
| CN109264732A (en) * | 2018-09-26 | 2019-01-25 | 芜湖市鹏磊新材料有限公司 | It is a kind of to have the function of reactivity preparation method for bentonite |
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