CN108676386B - Low-viscosity calcined kaolin, low-viscosity calcined kaolin slurry and preparation method thereof - Google Patents
Low-viscosity calcined kaolin, low-viscosity calcined kaolin slurry and preparation method thereof Download PDFInfo
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- 239000005995 Aluminium silicate Substances 0.000 title claims abstract description 279
- 235000012211 aluminium silicate Nutrition 0.000 title claims abstract description 279
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 279
- 239000002002 slurry Substances 0.000 title claims abstract description 113
- 238000002360 preparation method Methods 0.000 title abstract description 18
- 238000007613 slurry method Methods 0.000 title description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 122
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000002270 dispersing agent Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 23
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 20
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 19
- 239000006185 dispersion Substances 0.000 claims description 14
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 12
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 description 30
- 238000006116 polymerization reaction Methods 0.000 description 14
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
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- 235000019353 potassium silicate Nutrition 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- 229920002994 synthetic fiber Polymers 0.000 description 1
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- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
- C09C1/42—Clays
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
-
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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 discloses low-viscosity calcined kaolin, low-viscosity calcined kaolin slurry and a preparation method thereof, wherein the low-viscosity calcined kaolin comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, and the polyvinyl alcohol accounts for 0.05-1% of the mass of the calcined kaolin. The polyvinyl alcohol is coated on the calcined kaolin particles, so that the affinity between the low-viscosity calcined kaolin particles and water molecules is improved, and the viscosity of the low-viscosity calcined kaolin slurry is reduced. The application range of the low-viscosity calcined kaolin is expanded.
Description
Technical Field
The invention relates to the field of kaolin preparation, in particular to low-viscosity calcined kaolin. In addition, the invention also relates to low-viscosity calcined kaolin slurry and a preparation method thereof.
Background
The calcined kaolin is prepared by taking kaolin as a raw material and calcining the kaolin at high temperature, so that the chemical properties of the kaolin are changed to meet certain requirements. The particle size of the superfine calcined kaolin is less than 1 μm. In aqueous systems such as paint, compared with calcined kaolin products with 1250 mesh with coarse particle size, the superfine calcined kaolin has higher covering power and viscosity. However, ultrafine calcined kaolin is difficult to meet for use because of its relatively high viscosity when it is desired to formulate a slurry of calcined kaolin at higher concentrations to meet certain industrial requirements. The surface modification treatment is a common technical means for improving the application performance of the powder, and the surface of the powder is coated with an organic modifier to reduce the surface free energy of the powder, so that the compatibility of the inorganic powder with materials such as rubber, plastics and the like is improved, and the application performance is improved. In the aqueous slurry system, the superfine calcined kaolin can be subjected to surface modification without adding a dispersant into the slurry, so that the viscosity of the slurry can be remarkably reduced. However, when the particle size of the calcined kaolin is small, a high-concentration slurry of 55 to 65% is prepared, the viscosity is too high, and even if the amount of the dispersant is increased, the viscosity of the slurry cannot be significantly reduced.
Polyvinyl alcohol is an organic compound, a white flaky, flocculent or powdery solid, and is odorless. It is soluble in hot water, slightly soluble in dimethyl sulfoxide, and insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, and ethylene glycol. Polyvinyl alcohol is an important chemical raw material, and is used for manufacturing polyvinyl acetal, gasoline-resistant pipelines, vinylon synthetic fibers, fabric treating agents, emulsifiers, paper coatings, adhesives, glue and the like. In the prior art, the polyvinyl alcohol generally acts synergistically with the dispersant or stabilizer, however, little research has been conducted on the application of polyvinyl alcohol alone to kaolin.
Disclosure of Invention
The invention provides low-viscosity calcined kaolin, low-viscosity calcined kaolin slurry and a preparation method thereof, and aims to solve the technical problem that the application range of calcined kaolin is influenced due to the large viscosity of high-concentration calcined kaolin slurry.
The technical scheme adopted by the invention is as follows:
the invention provides low-viscosity calcined kaolin, which comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, wherein the mass of the polyvinyl alcohol is 0.05-1% of that of the calcined kaolin.
Further, the polymerization degree of the polyvinyl alcohol is 500-2600, and the alcoholysis degree is 78-99%.
Further, when the polymerization degree of the polyvinyl alcohol is 1600-1800, the mass of the polyvinyl alcohol is 0.3-0.4% of that of the calcined kaolin.
Further, when the polymerization degree of the polyvinyl alcohol is 550 to 800, the mass of the polyvinyl alcohol is 0.5 to 0.7% of the mass of the calcined kaolin.
Further, the calcined kaolin is ultrafine calcined kaolin, the particle size of which is less than 1 μm.
Further, the low-viscosity calcined kaolin also comprises a dispersing agent, and the dispersing agent accounts for 0.05-1% of the mass of the calcined kaolin.
According to another aspect of the present invention, there is provided a method for preparing a low viscosity calcined kaolin, comprising adding a polyvinyl alcohol solution to a slurry of calcined kaolin and drying to obtain a low viscosity calcined kaolin.
Further, the mass concentration of the calcined kaolin slurry is 20-55%.
Further, the polyvinyl alcohol is dissolved by hot water at the temperature of 60-98 ℃, and the mass concentration of the polyvinyl alcohol solution is 1-10%.
Further, the method comprises adding a dispersant when preparing the calcined kaolin slurry.
Further, the method comprises the step of carrying out depolymerization and scattering treatment after drying treatment to obtain the low-viscosity calcined kaolin.
According to another aspect of the present invention, there is also provided a low viscosity calcined kaolin slurry, comprising low viscosity calcined kaolin and water, wherein the temperature of the water is below 60 ℃, and preferably, the mass concentration of the low viscosity calcined kaolin slurry is 55-65%.
According to another aspect of the present invention, there is provided a method for preparing a low viscosity calcined kaolin slurry by adding water to a low viscosity calcined kaolin, dispersing, and stirring to obtain a low viscosity calcined kaolin slurry.
The invention has the following beneficial effects:
the invention provides a low viscosity calcined kaolin comprising polyvinyl alcohol and calcined kaolin. The low-viscosity calcined kaolin is dispersed in water with the temperature of below 60 ℃, and the polyvinyl alcohol is adsorbed on the surface of the calcined kaolin, so that the compatibility of calcined kaolin particles and water is improved, the viscosity is reduced, and the application range of the low-viscosity calcined kaolin is expanded.
The preparation method of the low-viscosity calcined kaolin provided by the invention comprises the steps of directly adding a polyvinyl alcohol solution into slurry of the calcined kaolin, and drying to obtain the low-viscosity calcined kaolin. The viscosity of the calcined kaolin slurry cannot be significantly reduced if the polyvinyl alcohol solution is added only when the calcined kaolin slurry is being formulated. The preparation method has the advantages of simple preparation process, mild reaction conditions and good repeatability, and is suitable for large-scale production. The prepared low-viscosity calcined kaolin has obvious effect and good practicability through tests, simulation, production and application.
In the low-viscosity calcined kaolin slurry provided by the invention, when the low-viscosity calcined kaolin is dispersed in water with the temperature of below 60 ℃, the polyvinyl alcohol is difficult to dissolve in cold water, so that the polyvinyl alcohol adsorbed on the surface of the low-viscosity calcined kaolin can be stably kept on the surface of calcined kaolin particles. Thus, the low viscosity calcined kaolin described above has a stable and long lasting affinity for water molecules, and thus the low viscosity calcined kaolin slurry produced has a relatively low viscosity at high mass concentrations. In contrast, adding a polyvinyl alcohol solution without treatment as described above, but only when preparing a superfine calcined kaolin slurry, does not significantly help to reduce the viscosity and increase the concentration of the calcined kaolin slurry.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The invention provides low-viscosity calcined kaolin, which comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, wherein the mass of the polyvinyl alcohol is 0.05-1% of that of the calcined kaolin.
The polyvinyl alcohol accounts for 0.05-1% of the mass of the calcined kaolin. The polyvinyl alcohol and the calcined kaolin are calculated according to dry basis, the addition amount of the polyvinyl alcohol is 0.05-1% of the mass of the dry basis of the calcined kaolin, and when a small amount of the polyvinyl alcohol is used, the polyvinyl alcohol has good dispersibility; when the polyvinyl alcohol is added in an excessive amount, the calcined kaolin slurry is seriously agglomerated during drying, is difficult to break up and depolymerize, and is not beneficial to the application performance of the calcined kaolin.
The low viscosity calcined kaolin, polyvinyl alcohol, as described above, is added to the calcined kaolin in a variety of ways, such as: dissolving with hot water to form a polyvinyl alcohol solution, and adding the polyvinyl alcohol solution into the calcined kaolin slurry; heating the calcined kaolin slurry to a higher temperature, and adding polyvinyl alcohol for dissolving; the manner of addition is not limited to one such that the polyvinyl alcohol is sufficiently dissolved in the calcined kaolin slurry. And then drying the calcined kaolin slurry, wherein the polyvinyl alcohol is gradually adsorbed on the surface of the calcined kaolin along with the evaporation of water, and finally obtaining the low-viscosity calcined kaolin.
The low viscosity calcined kaolin described above, comprising polyvinyl alcohol and calcined kaolin. The low-viscosity calcined kaolin is dispersed in water with the temperature of below 60 ℃, and the polyvinyl alcohol is adsorbed on the surface of the calcined kaolin, so that the compatibility of calcined kaolin particles and water is improved, the viscosity is reduced, and the application range of the low-viscosity calcined kaolin is expanded.
Preferably, the polymerization degree of the polyvinyl alcohol is 500-2600, and the alcoholysis degree is 78-99%. The physical properties of polyvinyl alcohol are influenced by chemical structure, alcoholysis degree and polymerization degree. The alcoholysis degree is generally 78%, 88% and 98%. The alcoholysis degree of partial alcoholysis is generally 87-89%, and the alcoholysis degree of complete alcoholysis is 98-100%. Often, the thousand or hundred digits of the average degree of polymerization are placed in front of the polymerization, and the percentage of alcoholysis is placed in the back, e.g., 17-88, i.e., the apparent degree of polymerization is 1700 and the alcoholysis is 88%. In general, the polymerization degree increases, the viscosity of an aqueous solution increases, and the strength and solvent resistance after film formation are improved, but the solubility in water and the elongation after film formation decrease. The polyvinyl alcohol 17-92 is easy to dissolve in hot water, the dissolving temperature is 75-80 ℃, other properties are basically the same as those of the polyvinyl alcohol 17-88, and the polyvinyl alcohol is used as an emulsion stabilizer for emulsion polymerization and used for preparing a water-soluble adhesive. The polyvinyl alcohol 17-99 is also called slashing resin, is soluble in hot water of 90-95 ℃ and is almost insoluble in cold water. Experiments prove that the polyvinyl alcohol with the polymerization degree of 500-2600 and the alcoholysis degree of 78-99% can be well dissolved and dispersed in the calcined kaolin slurry, and the viscosity of the low-viscosity calcined kaolin slurry is remarkably reduced. More preferably, the polyvinyl alcohol accounts for 0.3 to 0.4% by mass of the calcined kaolin when the polymerization degree of the polyvinyl alcohol is 1600 to 1800. When the polymerization degree of the polyvinyl alcohol is 550-800, the polyvinyl alcohol accounts for 0.5-0.7% of the calcined kaolin by proper mass. Since the degree of polymerization is related to the ratio of polyvinyl alcohol to calcined kaolin, the addition of polyvinyl alcohol and calcined kaolin can be performed with reference to the degree of polymerization.
Preferably, the calcined kaolin is ultrafine calcined kaolin having a particle size of less than 1 μm. The particle size of the calcined kaolin is less than 1 mu m; in aqueous systems such as coating and the like, compared with calcined kaolin products with the particle size of 1250 meshes, the low-viscosity calcined kaolin has higher covering power and viscosity, is more suitable for certain special industrial requirements, and improves the application performance.
Preferably, the low-viscosity calcined kaolin further comprises a dispersant, and the dispersant accounts for 0.05-1% of the mass of the calcined kaolin. The calcined kaolin is added with a dispersant to be adsorbed on the surface of the particles, so that the interaction between the particles and a liquid phase medium and between the particles is changed, and the particles have stronger repulsive force, thereby forming stable suspension. The dispersant is sodium hexametaphosphate, sodium polyacrylate or water glass. The addition of the above-described dispersant can reduce the time and energy required for the calcined kaolin to complete the dispersion process, stabilizing the dispersion of calcined kaolin.
As a general inventive concept, the present invention also provides a method for preparing a low viscosity calcined kaolin, wherein a polyvinyl alcohol solution is added to the calcined kaolin slurry, and the calcined kaolin is dried to obtain the low viscosity calcined kaolin.
The preparation method of the low-viscosity calcined kaolin comprises the steps of directly adding the polyvinyl alcohol solution into the slurry of the calcined kaolin, and drying to obtain the low-viscosity calcined kaolin. The viscosity of the calcined kaolin slurry cannot be significantly reduced if the polyvinyl alcohol solution is added only when the calcined kaolin slurry is being formulated. The preparation method has the advantages of simple preparation process, mild reaction conditions and good repeatability, and is suitable for large-scale production. The prepared low-viscosity calcined kaolin has obvious effect and good practicability through tests, simulation, production and application.
Preferably, the mass concentration of the calcined kaolin slurry is 20-55%. Generally, the calcined kaolin and water are mixed according to the weight ratio of 1-3: 1, and when the mass concentration of the calcined kaolin slurry reaches more than 55%, the viscosity increases more rapidly as the concentration is higher. Therefore, the polyvinyl alcohol is used as a dispersing agent, and the polyvinyl alcohol can be applied to calcined kaolin slurry with the mass concentration higher than 55%, so that the viscosity of the system is remarkably reduced.
Preferably, the polyvinyl alcohol is dissolved by hot water at the temperature of 60-98 ℃, and the mass concentration of the polyvinyl alcohol solution is 1-10%. The polyvinyl alcohol has a polar side chain containing a large number of hydroxyl groups, and is easily soluble in hot water. The dissolving process of the polyvinyl alcohol comprises swelling and dissolving, namely water molecules enter the inside of a macromolecular chain of the polyvinyl alcohol to increase the volume of the macromolecular chain, and then the swelled polyvinyl alcohol molecules are transferred into the aqueous solution. The temperature has great influence on the water solubility of polyvinyl alcohol, and macromolecular polyvinyl alcohol is in a glass state and is partially crystallized, so that the macromolecular polyvinyl alcohol is difficult to dissolve in cold water and only exists in a gel form. When the temperature reaches 60-98 ℃, macromolecular polyvinyl alcohol is converted into a high-elasticity state from a glass state, a crystalline part begins to melt, the mobility of a molecular chain is greatly increased, and the solubility of the macromolecular polyvinyl alcohol in water is greatly improved. The dissolution temperature of polyvinyl alcohol in water is generally above 60 ℃. Therefore, the polyvinyl alcohol is required to be prepared into a solution with a certain concentration in hot water and then added into the slurry of the calcined kaolin. So that the calcined kaolin particles are uniformly dispersed and the viscosity is reduced.
The stirring time for dissolving the polyvinyl alcohol is 20-30 min. And the polyvinyl alcohol is stirred to effectively prevent the polyvinyl alcohol from caking, so that the polyvinyl alcohol is uniformly dissolved, and then the polyvinyl alcohol is added into the calcined kaolin slurry to accelerate the mixing progress.
Preferably, the method further comprises adding a dispersant during the preparation of the calcined kaolin slurry. When preparing the calcined kaolin slurry, a dispersant is added to facilitate the dispersion of the calcined kaolin. More preferably, the dispersant is sodium hexametaphosphate, sodium polyacrylate or water glass. The addition of the dispersant reduces the time and energy required by the calcined kaolin to complete the dispersion process, stabilizes the dispersion of the calcined kaolin, further improves the slurry concentration, and reduces the drying cost.
Preferably, the method further comprises performing depolymerization and disintegration treatment after the drying treatment to obtain the low-viscosity calcined kaolin. The calcined kaolin slurry containing the polyvinyl alcohol is pumped into a spray dryer, is mixed with compressed air in a nozzle of a drying tower, is sprayed upwards in a mist shape through a drying nozzle, the mist material sprayed from the nozzle is contacted with hot air, and the mist material is rapidly heated and dried in the hot air. Drying can be performed in various forms such as box drying, flash drying and spray drying, and spray drying is preferred. Spray drying is more beneficial to the uniform coating of the polyvinyl alcohol on the surface of the calcined kaolin.
The dried material is broken up by a depolymerizer, and after depolymerization and breaking up treatment, the low-viscosity calcined kaolin particles are uniformly distributed to prevent agglomeration. The low viscosity calcined kaolin described above is obtained.
The invention further provides low-viscosity calcined kaolin slurry as a general inventive concept, which comprises low-viscosity calcined kaolin and water, wherein the temperature of the water is below 60 ℃, and preferably, the mass concentration of the low-viscosity calcined kaolin slurry is 55-65%.
In the low-viscosity calcined kaolin slurry, when the low-viscosity calcined kaolin is dispersed in water at a temperature of 60 ℃ or lower, the polyvinyl alcohol is hardly soluble in cold water, and therefore, the polyvinyl alcohol adsorbed on the surface of the low-viscosity calcined kaolin can be stably retained on the surface of the calcined kaolin particles. Thus, the low viscosity calcined kaolin described above has a stable and long lasting affinity for water molecules, and thus the low viscosity calcined kaolin slurry produced has a relatively low viscosity at high mass concentrations.
As a general inventive concept, the invention also provides a method for preparing low-viscosity calcined kaolin slurry, which comprises the steps of adding water into low-viscosity calcined kaolin, dispersing and stirring to obtain the low-viscosity calcined kaolin slurry. The preparation method of the low-viscosity calcined kaolin slurry also comprises the step of adding a dispersing agent in the dispersing process of the low-viscosity calcined kaolin.
The preparation method of the low-viscosity calcined kaolin slurry comprises the following specific steps: adding water with the temperature of 60 ℃ below into low-viscosity calcined kaolin, preparing low-viscosity calcined kaolin slurry with the mass concentration of 55-65% by a high-speed dispersion machine, adding a dispersing agent during preparation, wherein the adding amount of the dispersing agent is 0.05-1% of the dry mass of the low-viscosity calcined kaolin, and stirring for 30-60 min to obtain the low-viscosity calcined kaolin slurry.
Examples
In the following examples, each chemical reagent is commercially available.
Example 1
The low viscosity calcined kaolin of this example comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, the polyvinyl alcohol being 0.3% by mass of the calcined kaolin. Calcined kaolin: the average particle size was 0.9. mu.m; polyvinyl alcohol specification: 17-99.
The low viscosity calcined kaolin of this example was prepared by the method of:
polyvinyl alcohol is dissolved in hot water at 98 ℃ in advance, and is stirred for 20min to prepare a solution with the mass concentration of 2%. Preparing calcined kaolin into slurry with the mass concentration of 40%, and adding sodium hexametaphosphate as a dispersing agent, wherein the mass of the sodium hexametaphosphate is 0.3% of the mass of the calcined kaolin. And adding the prepared polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount of the polyvinyl alcohol solution is 0.3 percent of the mass of the calcined kaolin. Drying the calcined kaolin slurry containing the polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin.
The method of preparing the low viscosity calcined kaolin slurry of this example:
preparing low-viscosity calcined kaolin slurry with the mass concentration of 60% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the mass of the sodium polyacrylate is 0.4% of that of the low-viscosity calcined kaolin, and stirring for 60 min. The low viscosity calcined kaolin slurry was measured to have a viscosity of 50 centipoise.
Example 2
The low viscosity calcined kaolin of this example comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, the polyvinyl alcohol being 0.05% by mass of the calcined kaolin. Calcined kaolin: the average particle size was 0.9. mu.m; polyvinyl alcohol specification: 17-88.
The method of making the low viscosity calcined kaolin of this example.
Polyvinyl alcohol is dissolved in hot water at 98 ℃ in advance, and is stirred for 20min to prepare a solution with the mass concentration of 2%. Preparing calcined kaolin into slurry with the mass concentration of 50%, and adding sodium polyacrylate serving as a dispersing agent, wherein the mass of the sodium polyacrylate is 0.3% of that of the calcined kaolin. And adding the prepared polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount of the polyvinyl alcohol solution is 0.05 percent of the mass of the calcined kaolin. Drying the calcined kaolin slurry containing the polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin.
The method of preparing the low viscosity calcined kaolin slurry of this example:
preparing low-viscosity calcined kaolin slurry with the mass concentration of 65% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the mass of the sodium polyacrylate is 0.8% of that of the low-viscosity calcined kaolin, and stirring for 30 min. The low viscosity calcined kaolin slurry was measured to have a viscosity of 60 centipoise.
Example 3
The low viscosity calcined kaolin of this example comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, the polyvinyl alcohol being 0.2% by mass of the calcined kaolin. Calcined kaolin: the average particle size was 0.9. mu.m; polyvinyl alcohol specification: 24-99.
The low viscosity calcined kaolin of this example was prepared by the method of:
polyvinyl alcohol is dissolved in hot water at 98 ℃ in advance, and is stirred for 20min to prepare a solution with the mass concentration of 2%. Preparing calcined kaolin into slurry with the mass concentration of 20%, and adding sodium hexametaphosphate as a dispersing agent, wherein the mass of the sodium hexametaphosphate is 0.3% of the mass of the calcined kaolin. And adding the prepared polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount of the polyvinyl alcohol solution is 0.2 percent of the mass of the calcined kaolin. Drying the calcined kaolin slurry containing the polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin.
The method of preparing the low viscosity calcined kaolin slurry of this example:
preparing low-viscosity calcined kaolin slurry with the mass concentration of 55% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the mass of the sodium polyacrylate is 0.4% of that of the low-viscosity calcined kaolin, and stirring for 30 min. The low viscosity calcined kaolin slurry was determined to have a viscosity of 55 centipoise.
Example 4
The low viscosity calcined kaolin of this example comprised calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, the polyvinyl alcohol being 1% by mass of the calcined kaolin. Calcined kaolin: average particle size 0.9 μm; polyvinyl alcohol specification: 05-88.
The low viscosity calcined kaolin of this example was prepared by the method of:
polyvinyl alcohol is dissolved in hot water at 98 ℃ in advance, and is stirred for 20min to prepare a solution with the mass concentration of 4%. Preparing calcined kaolin into slurry with the mass concentration of 40%, and adding sodium hexametaphosphate as a dispersing agent, wherein the mass of the sodium hexametaphosphate is 0.3% of the mass of the calcined kaolin. And adding the prepared polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount is 1% of the mass of the calcined kaolin. Drying the calcined kaolin slurry containing the polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin.
The method of preparing the low viscosity calcined kaolin slurry of this example:
preparing low-viscosity calcined kaolin slurry with the mass concentration of 60% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the mass of the sodium polyacrylate is 0.4% of that of the low-viscosity calcined kaolin, and stirring for 30 min. The low viscosity calcined kaolin slurry was determined to have a viscosity of 58 centipoise.
Example 5
The low viscosity calcined kaolin of this example comprises calcined kaolin and polyvinyl alcohol adsorbed on the surface of the calcined kaolin, the polyvinyl alcohol being 0.7% by mass of the calcined kaolin. Calcined kaolin: the average particle size was 0.9. mu.m; polyvinyl alcohol specification: 08-88.
The low viscosity calcined kaolin of this example was prepared by the method of:
polyvinyl alcohol is dissolved in water with the temperature of 98 ℃ in advance, and is stirred for 20min to prepare a solution with the mass concentration of 4%. Preparing calcined kaolin into slurry with the mass concentration of 35%, and adding sodium hexametaphosphate as a dispersing agent, wherein the mass of the sodium hexametaphosphate is 0.3% of that of the calcined kaolin. And adding the prepared polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount of the polyvinyl alcohol solution is 0.7 percent of the mass of the calcined kaolin. Drying the calcined kaolin slurry containing the polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin.
The method of preparing the low viscosity calcined kaolin slurry of this example:
preparing low-viscosity calcined kaolin slurry with the mass concentration of 65% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the mass of the sodium polyacrylate is 0.4% of that of the low-viscosity calcined kaolin, and stirring for 30 min. The low viscosity calcined kaolin slurry was determined to have a viscosity of 57 centipoise.
Comparative example 1
The calcined kaolin in the example 1 is prepared into slurry with the mass concentration of 60% through a high-speed dispersion machine, sodium polyacrylate serving as a dispersing agent is added during preparation, the mass of the sodium polyacrylate is 0.4% of that of the calcined kaolin, and the mixture is stirred for 30 min. The viscosity of the calcined kaolin slurry is measured to be 800 centipoises, and the calcined kaolin slurry is continuously stirred for 60min, so that the viscosity of the calcined kaolin slurry is basically unchanged.
Comparative example 2
The calcined kaolin in the example 1 is prepared into slurry with the mass concentration of 60% through a high-speed dispersion machine, sodium polyacrylate and polyvinyl alcohol 17-99 solution are added during preparation, the mass concentration of the sodium polyacrylate and the polyvinyl alcohol 17-99 solution is respectively 0.4% and 0.3% of the mass of the calcined kaolin, and the mass concentration of the polyvinyl alcohol 17-99 solution is 2%, and the mixture is stirred for 60 min. The calcined kaolin slurry was determined to have a viscosity of 700 centipoise.
It can be seen that the low viscosity calcined kaolin slurries prepared herein have a relatively low viscosity at high mass concentrations. In contrast, adding a polyvinyl alcohol solution without treatment as described above, but only when preparing a superfine calcined kaolin slurry, does not significantly help to reduce the viscosity and increase the concentration of the calcined kaolin slurry.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for preparing low-viscosity calcined kaolin is characterized in that,
dissolving polyvinyl alcohol 17-99 in hot water at 98 ℃, and stirring for 20min to prepare a polyvinyl alcohol solution with the mass concentration of 2%;
preparing calcined kaolin with the average particle size of 0.9 mu m into slurry with the mass concentration of 40 percent, and adding sodium hexametaphosphate as a dispersing agent, wherein the mass of the sodium hexametaphosphate is 0.3 percent of that of the calcined kaolin;
adding polyvinyl alcohol solution into the calcined kaolin slurry, wherein the addition amount is 0.3 percent of the mass of the calcined kaolin;
drying the calcined kaolin slurry containing polyvinyl alcohol in a spray dryer, and then scattering the calcined kaolin slurry through a depolymerizer to obtain the low-viscosity calcined kaolin;
preparing low-viscosity calcined kaolin slurry with the mass concentration of 60% by a high-speed dispersion machine, adding sodium polyacrylate serving as a dispersing agent when preparing, wherein the sodium polyacrylate is 0.4% of the mass of the low-viscosity calcined kaolin, and stirring for 60min, and the viscosity of the low-viscosity calcined kaolin slurry is 50 centipoise.
2. A low viscosity calcined kaolin slurry, characterized in that the low viscosity calcined kaolin obtained by the method for preparing a low viscosity calcined kaolin according to claim 1,
the low viscosity calcined kaolin slurry comprises a low viscosity calcined kaolin and water, the water having a temperature of less than 60 ℃.
3. The low viscosity calcined kaolin slurry of claim 2,
the mass concentration of the low-viscosity calcined kaolin slurry is 60%.
4. A method for producing a low viscosity calcined kaolin slurry, characterized in that the low viscosity calcined kaolin obtained by the method for producing a low viscosity calcined kaolin according to claim 1,
and adding water into the low-viscosity calcined kaolin, dispersing and stirring to obtain the low-viscosity calcined kaolin slurry.
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