CN114481697B - Brucite composite material and preparation method and application thereof - Google Patents
Brucite composite material and preparation method and application thereof Download PDFInfo
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- CN114481697B CN114481697B CN202210063676.XA CN202210063676A CN114481697B CN 114481697 B CN114481697 B CN 114481697B CN 202210063676 A CN202210063676 A CN 202210063676A CN 114481697 B CN114481697 B CN 114481697B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
- B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
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Abstract
The invention belongs to the technical field of papermaking, and particularly relates to a brucite composite material as well as a preparation method and application thereof. The invention provides a brucite composite material, which comprises brucite and inorganic filler; the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite; the inorganic filler and the brucite have different micro-morphologies. According to the invention, brucite and inorganic filler with different microcosmic appearances are compounded, and mutual stacking among different microcosmic appearances is utilized, so that agglomeration of the brucite and the inorganic filler can be reduced, pores between the brucite and the inorganic filler are further increased, the compactness of the composite material is reduced, and the oil absorption value of the composite material is improved.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a brucite composite material as well as a preparation method and application thereof.
Background
The thermal paper is also called thermal facsimile paper, thermal recording paper, or thermal copy paper. Thermal papers generally comprise a raw base paper substrate, a pre-coat layer, and a thermochromic layer. In the printing process, the dye and the color developing agent in the thermosensitive color changing layer are subjected to chemical reaction to generate color change when being heated, so that a printed image is obtained.
In order to increase the recording speed of the thermal paper, it is generally necessary to add a low-melting substance to the thermochromic layer to lower the melting points of the dye and the developer. However, the molten substance generated by the low-melting-point substance during printing is easy to adhere to the thermal pen (printing head), which affects the thermal conductivity of the thermal pen and reduces the color development sensitivity of the thermal paper during subsequent printing.
In order to solve the above problems, at present, a filler having oil absorption is mainly added to a precoat layer to enhance the adsorption of the thermal paper to the molten substances, thereby reducing the accumulation of the molten substances on the print head. The prior art oil-absorbing fillers mainly comprise kaolin, talc or light calcium carbonate, but the above fillers still have the disadvantage of low oil absorption values (less than 50mL/100 g), resulting in low color development sensitivity of the thermal paper.
Disclosure of Invention
The brucite composite material provided by the invention has a high oil absorption value, and can improve the color development sensitivity of thermal paper.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a brucite composite material, which comprises brucite and inorganic filler;
the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite;
the inorganic filler and the brucite have different micro-morphologies.
Preferably, the microscopic morphology of the brucite is flaky or fibrous; the micro-morphology of the kaolin is sheet-shaped; the micro-morphology of the calcium carbonate is granular; the micro appearance of the wollastonite is fibrous.
Preferably, the mass ratio of the brucite to the inorganic filler is (1-10): (1-10).
The particle size of the brucite composite material is 0.8-1.4 um.
The invention also provides a preparation method of the brucite composite material, which comprises the following steps:
and mixing brucite and inorganic filler, and grinding to obtain the brucite composite material.
Preferably, the grinding comprises sequentially performing dry grinding and wet grinding.
Preferably, the wet-milled raw material further comprises a dispersant and a modifier.
Preferably, the dispersant comprises a copolymer of lignosulfonate and acrylic acid;
the molecular weight of the copolymer is 3500-4500;
the mass of the dispersant is 0.4-0.8% of the mass of brucite.
Preferably, the modifier comprises water-soluble chitosan and cationic starch;
the mass ratio of the water-soluble chitosan to the cationic starch is 1:1 to 5;
the mass of the modifier is 0.4-0.8% of the total mass of the brucite and the inorganic filler.
Preferably, the rotation speed of the wet grinding is 1300-1400 rpm, and the time is 60-90 min.
The invention also provides an application of the brucite composite material in the technical scheme or the brucite composite material prepared by the preparation method in the technical scheme in preparation of a thermal paper precoat.
The invention provides a brucite composite material, which comprises brucite and inorganic filler; the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite; the inorganic filler and the brucite have different micro-morphologies. The brucite and the inorganic filler with different microcosmic appearances are compounded, and the mutual stacking among the different microcosmic appearances is utilized, so that the agglomeration of the brucite and the inorganic filler can be reduced, the pores between the brucite and the inorganic filler are further increased, the compactness of the composite material is reduced, and the oil absorption value of the composite material is improved. According to the description of the embodiment, the brucite composite material has the oil absorption value of 50-100 mL/100g, and can improve the color development sensitivity of the thermal paper when being applied to the precoating layer of the thermal paper.
Drawings
FIG. 1 is an SEM image of a brucite composite obtained in example 1;
FIG. 2 is an SEM image of a brucite composite obtained in example 2;
FIG. 3 is an SEM photograph of the brucite composite obtained in example 6.
Detailed Description
The invention provides a brucite composite material, which comprises brucite and inorganic filler;
the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite;
the inorganic filler and the brucite have different micro-morphologies.
In the invention, the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite; in the case where the inorganic filler is two or more selected from the above options, the proportion of the specific substance in the present invention is not particularly limited, and the specific substances may be mixed in any proportion.
In the present invention, the microscopic morphology of the brucite is preferably in the form of flakes or fibers. In the invention, the micro-morphology of the kaolin is preferably flake-shaped; the micro-morphology of the calcium carbonate is preferably granular; the micro-morphology of the wollastonite is preferably fibrous. In the invention, the brucite and the inorganic filler in the brucite composite material have different micro-morphologies. According to the invention, brucite and inorganic filler with different microcosmic appearances are compounded, and different microcosmic appearances are piled up, so that the agglomeration of the brucite and the inorganic filler can be reduced, the pores between the brucite and the inorganic filler are further increased, the compactness of the composite material is reduced, and the oil absorption value of the composite material is improved.
In the present invention, the particle diameter of the inorganic filler is preferably 0.8 to 1.4um, more preferably 0.9 to 1.3 μm, and still more preferably 1.0 to 1.2 μm. In the present invention, the particle size of the brucite composite material is preferably 0.8 to 1.4. Mu.m, more preferably 0.9 to 1.3. Mu.m, and still more preferably 1.0 to 1.2. Mu.m.
In the present invention, the mass ratio of the brucite to the inorganic filler is preferably (1 to 10): (1 to 10), more preferably (2 to 9): (2 to 9), more preferably (3 to 8): (3-8).
The invention also provides a preparation method of the brucite composite material in the technical scheme, which comprises the following steps:
and mixing brucite and inorganic filler, and grinding to obtain the brucite composite material.
In the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.
In the invention, the brucite is preferably obtained by screening and washing raw brucite ores. The source of the brucite raw ore is not particularly required by the invention, and the source which is well known to the technical personnel in the field can be adopted. The present invention does not require any special procedures for the screening and washing processes, and can be carried out using procedures well known to those skilled in the art. In the present invention, the purity of the brucite is preferably 96%.
In the present invention, when the inorganic filler preferably comprises kaolin, the kaolin is preferably obtained by crushing, desanding and sorting kaolin raw ore. The kaolin crude ore source is not particularly required in the invention, and the source well known to those skilled in the art can be adopted. The present invention does not require any special procedures for the crushing, desanding and sorting, and can be performed using procedures well known to those skilled in the art. In the present invention, the purity of the kaolin is preferably 90%.
In the present invention, when the inorganic filler preferably includes calcium carbonate, the calcium carbonate is preferably obtained by screening and washing raw calcium carbonate ore. The source of the calcium carbonate raw ore is not particularly required by the invention, and the source known to those skilled in the art can be adopted. The present invention has no particular requirements for the screening and washing process and may be carried out using processes well known to those skilled in the art. In the present invention, the purity of the calcium carbonate is preferably 96%.
In the present invention, when the inorganic filler preferably comprises wollastonite, the wollastonite is preferably obtained by screening and washing raw wollastonite ore. The invention has no special requirements on the source of the wollastonite raw ore, and the wollastonite raw ore can be obtained from sources well known to those skilled in the art. The present invention has no particular requirements for the screening and washing process and may be carried out using processes well known to those skilled in the art. In the present invention, the purity of the wollastonite is preferably 96%.
In the present invention, the mass ratio of the brucite to the inorganic filler is preferably (1 to 10): (1 to 10), more preferably (2 to 9): (2 to 9), more preferably (3 to 8): (3-8).
The process of mixing is not particularly limited in the present invention, and may be performed by a process known to those skilled in the art.
After the mixing is completed, the invention also preferably comprises crushing the mixed material. The process of the present invention is not particularly limited, and may be carried out by a process known to those skilled in the art. In the present invention, the crushing is preferably carried out in a jaw crusher.
In the present invention, the grinding preferably includes sequentially performing dry grinding and wet grinding.
The dry grinding process is not particularly limited in the present invention, and may be performed by a process known to those skilled in the art. In the present invention, the dry grinding is preferably carried out in a ring roll mill. In the present invention, the particle size of the coarse powder obtained by the dry grinding is preferably 200 to 300 mesh, more preferably 220 to 280 mesh, and still more preferably 240 to 260 mesh.
After the dry grinding is finished, the invention also preferably comprises iron removal treatment of the obtained coarse powder. The process of the iron removal treatment in the present invention is not particularly limited, and may be performed by a process known to those skilled in the art.
In the present invention, the wet-milled raw material preferably further includes a dispersant and a modifier.
In the present invention, the dispersant preferably comprises a copolymer of lignosulfonate and acrylic acid.
In the present invention, the method for preparing the copolymer preferably comprises the steps of:
under the protection of ultrasound and nitrogen, the lignosulfonate solution and NaHSO are mixed 3 Stirring and mixing, then dripping acrylic monomer and (NH) 4 ) 2 S 2 O 8 And an initiator to carry out copolymerization reaction to obtain the copolymer.
In the present invention, the lignosulfonate in the lignosulfonate solution is preferably sodium lignosulfonate. In the present invention, the mass concentration of the lignosulfonate solution is preferably 10%. In the present invention, the mass of the acrylic acid monomer is 20% of the mass of the lignosulfonate. In the present invention, the NaHSO 3 The mass of (b) is 5% of the mass of the acrylic monomer. In the present invention, the (NH) 4 ) 2 S 2 O 8 The mass of the initiator was 1.0% of the mass of the acrylic monomer.
In the present invention, the power of the ultrasound is preferably 800 to 1000W, more preferably 850 to 950W, and still more preferably 880 to 900W.
In the present invention, the rotation speed of the stirring is preferably 1300 to 1400rpm, more preferably 1350rpm. In the present invention, the time for the dropwise addition is preferably 60min. In the present invention, the time of the polymerization reaction is preferably 180min; the temperature was 60 ℃.
After the polymerization reaction is completed, the invention also preferably comprises the step of carrying out post-treatment on the obtained reaction liquid; the post-treatment preferably comprises precipitation, filtration and washing in sequence. In the present invention, the precipitation is preferably carried out by mixing the reaction solution with acetone. The amount of acetone used in the present invention is not particularly limited, and those known to those skilled in the art can be used. The filtration and washing processes of the present invention are not particularly limited and may be performed by processes well known to those skilled in the art. In the present invention, the polymerization is preferably carried out in a flask with a reflux condenser.
In the present invention, the molecular weight of the copolymer is preferably 3500 to 4500, more preferably 3800 to 4300, and still more preferably 4000 to 4200. In the present invention, the mass of the dispersant is preferably 0.4% to 0.8%, more preferably 0.5% to 0.7%, and still more preferably 0.6% of the mass of the brucite. In the invention, the dispersant can further improve the efficiency of wet grinding; the lignosulfonate has a C3-C6 hydrophobic framework, and can avoid agglomeration of powder in a grinding process after being subjected to graft copolymerization with acrylic acid, and meanwhile, the compatibility of the brucite composite material and paper can be enhanced.
In the present invention, the modifier preferably includes water-soluble chitosan and cationic starch. In the present invention, the mass ratio of the water-soluble chitosan to the cationic starch is preferably 1:1 to 5, more preferably 1:2 to 4, more preferably 1:3. in the present invention, the mass of the modifier is preferably 0.4% to 0.8%, more preferably 0.5% to 0.7%, and still more preferably 0.6% of the total mass of the brucite and the inorganic filler. In the present invention, the modifier can further improve the dispersibility of the particles; the water-soluble chitosan can form hydrogen bonds with paper fibers, and can effectively reduce the shrinkage rate of the base paper under the synergistic action of the water-soluble chitosan and cationic starch, further improve the strength of paper and improve the retention rate of the composite material in a coating.
In the present invention, the wet grinding process preferably includes: after the coarse powder, the dispersant and the dispersion medium are mixed, the modifier is added during the wet grinding process.
In the present invention, the dispersion medium is preferably water.
The process of mixing is not particularly limited in the present invention, and may be performed by a process known to those skilled in the art. In the present invention, the mixing is preferably performed in a slurry tank. In the present invention, the solid content of the slurry obtained after the mixing is preferably 50 to 70%, more preferably 52 to 68%, and still more preferably 55 to 65%.
After the mixing is completed, the invention preferably comprises conveying the slurry obtained by mixing into a vertical stirring mill through a diaphragm pump for wet grinding. In the present invention, the feeding rate of the diaphragm pump is preferably 10 to 15Hz, more preferably 11 to 14Hz, and still more preferably 12 to 13Hz.
In the invention, the grinding medium adopted in the wet grinding process is preferably high-purity alumina ceramic balls; the grain diameter of the high-purity alumina ceramic ball is preferably 1.0-1.2 mm, and more preferably 1.1mm. In the present invention, the wet grinding is preferably carried out in a vertical stirred mill with an alumina ceramic lining. In the present invention, the volume ratio of the total volume of the high-purity alumina ceramic balls to the alumina ceramic lining is preferably 60% to 65% (i.e., the filling rate of the high-purity alumina ceramic balls is 60% to 65%), more preferably 61% to 64%, and still more preferably 62% to 63%. In the present invention, the ball-to-material ratio in the wet grinding process is preferably 3 to 4:1.
according to the invention, preferably, after the mixture of the coarse powder, the dispersing agent and the dispersion medium is subjected to wet grinding for 30-40 min, the modifying agent is continuously added from a medicine adding port in the middle of the vertical stirring mill through a metering pump. In the invention, the modifier is added by adopting the above defined method, so that the binding force between the modifier and the mixture can be further improved, and the modifier can better coat the mixture to avoid the agglomeration of the mixture.
In the present invention, the rotation speed of the wet grinding is preferably 1300 to 1400rpm, more preferably 1320 to 1380rpm, and still more preferably 1330 to 1350rpm; the time is preferably 60 to 90min, more preferably 65 to 85min, and still more preferably 70 to 80min.
After the wet grinding is finished, the method also preferably comprises the step of carrying out post-treatment on the obtained material; the treatment preferably comprises iron removal, sieving, filter pressing, drying, scattering and depolymerization which are sequentially carried out to obtain the brucite composite material. The processes of iron removal, sieving, filter pressing, drying, scattering and depolymerization described in the present invention are not particularly limited, and may be performed by processes well known to those skilled in the art.
The invention also provides an application of the brucite composite material in the technical scheme or the brucite composite material prepared by the preparation method in the technical scheme in preparation of a thermal paper precoat. The present invention is not limited to the specific embodiments of the application, and can be implemented by using embodiments known to those skilled in the art.
In the present invention, the brucite composite material preferably has an oil absorption value of 50 to 100mL/100g.
For further illustration of the present invention, a brucite composite material and a preparation method and application thereof provided by the present invention will be described in detail with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Crushing, desanding and sorting kaolin crude ore to obtain kaolin (with a sheet shape in a microscopic appearance) with the purity of 90%; screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is fibrous);
uniformly mixing 3 tons of kaolin and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and carrying out iron removal treatment to obtain coarse powder with the particle size of 200-300 meshes;
5.2 tons of coarse powder, 4.707 tons of water and 31.2Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid are put into a pulp mixing tank to be mixed, so that pulp with the solid content of 52 percent is obtained; the slurry is conveyed into a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 14Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.2mm, the filling rate is 63%, the ball-to-material ratio is 3).
Example 2
Screening and washing raw calcium carbonate ore to obtain calcium carbonate with the purity of 96% (the micro-morphology is granular); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microcosmic appearance is flaky);
mixing 3 tons of calcium carbonate and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
5.5 tons of coarse powder, 4.707 tons of water and 33Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid are put into a pulp preparing tank for mixing to obtain pulp with the solid content of 55 percent; the slurry is conveyed into a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 14Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 62%, the ball-material ratio is 4.
Example 3
Screening and washing wollastonite raw ore to obtain wollastonite with the purity of 96% (fibrous microstructure); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microcosmic appearance is flaky);
mixing 6 tons of wollastonite and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
5.5 tons of coarse powder, 4.497 tons of water and 33Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid are put into a pulp mixing tank to be mixed, so that pulp with the solid content of 55% is obtained; conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 14Hz for wet grinding (a grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 62%, the ball-to-material ratio is 4), the grinding speed is 1350rpm, after grinding for 30min, adding a compound formed by 33Kg of water-soluble chitosan and cationic starch (the mass ratio of the water-soluble chitosan to the cationic starch is 1).
Example 4
Crushing, desanding and sorting kaolin crude ore to obtain kaolin (with a sheet shape in a microscopic appearance) with the purity of 90%; screening and washing raw calcium carbonate ore to obtain calcium carbonate with the purity of 96% (the micro-morphology is granular); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is fibrous);
mixing 2 tons of kaolin, 2 tons of calcium carbonate and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
putting 6.1 tons of coarse powder, 3.9 tons of water and 36.6Kg of copolymer (with the molecular weight of 3950) formed by sodium lignosulfonate and acrylic acid into a pulp mixing tank for mixing to obtain pulp with the solid content of 61 percent; and (2) conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 14Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5).
Example 5
Crushing, desanding and sorting kaolin crude ore to obtain kaolin with the purity of 90% (the micro-morphology is flaky); screening and washing wollastonite raw ore to obtain wollastonite with the purity of 96% (fibrous microstructure); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is fibrous);
mixing 2 tons of kaolin, 2 tons of wollastonite and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
6.1 tons of coarse powder, 3.9 tons of water and 42.7Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid are put into a pulp mixing tank to be mixed, so that pulp with the solid content of 61 percent is obtained; conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (a grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 62%, the ball-to-material ratio is 3.5), the grinding speed is 1350rpm, after grinding for 30min, adding a compound formed by 38.6Kg of water-soluble chitosan and cationic starch (the mass ratio of the water-soluble chitosan to the cationic starch is 1).
Example 6
Screening and washing raw calcium carbonate ore to obtain calcium carbonate with the purity of 96% (the micro-morphology is granular); screening and washing wollastonite raw ore to obtain wollastonite with the purity of 96% (fibrous microstructure); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is flaky);
mixing 2 tons of calcium carbonate, 2 tons of wollastonite and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
putting 6 tons of coarse powder, 3.96 tons of water and 36Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid into a pulp mixing tank for mixing to obtain pulp with solid content of 60%; conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (a grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5), the grinding speed is 1350rpm, after grinding for 30min, adding a compound formed by 39Kg of water-soluble chitosan and cationic starch (the mass ratio of the water-soluble chitosan to the cationic starch is 1).
Example 7
Crushing, desanding and sorting kaolin crude ore to obtain kaolin with the purity of 90% (the micro-morphology is flaky); screening and washing raw calcium carbonate ore to obtain calcium carbonate with the purity of 96% (the micro-morphology is granular); screening and washing wollastonite raw ore to obtain wollastonite with the purity of 96% (fibrous microstructure); screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is fibrous);
mixing 2 tons of kaolin, 2 tons of wollastonite, 2 tons of calcium carbonate and 1 ton of brucite, crushing by a jaw crusher, carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
putting 6 tons of coarse powder, 3.96 tons of water, 36Kg of copolymer (with the molecular weight of 4000) formed by sodium lignosulfonate and acrylic acid into a pulp preparing tank for mixing to obtain pulp with the solid content of 60 percent; and (2) conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5).
Comparative example 1
Screening and washing brucite raw ore to obtain brucite with the purity of 96% (the microscopic morphology is flaky);
crushing 7 tons of brucite with the purity of 96% by a jaw crusher, then carrying out dry ball milling in a ring roller mill, and obtaining coarse powder with the particle size of 200-300 meshes through iron removal treatment;
taking 6 tons of coarse powder, 3.96 tons of water and 36Kg of copolymer (molecular weight 4000) formed by sodium lignin sulfonate and acrylic acid, and putting the mixture into a pulp mixing tank for mixing to obtain pulp with solid content of 60%; and (2) conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5).
Comparative example 2
Crushing, desanding and sorting kaolin crude ore to obtain kaolin with the purity of 90% (the micro-morphology is flaky);
crushing 7 tons of kaolin with the purity of 90% by a jaw crusher, then carrying out dry ball milling in a ring roller mill, and carrying out iron removal treatment to obtain coarse powder with the particle size of 200-300 meshes;
taking 6 tons of coarse powder, 2.96 tons of water and 36Kg of copolymer (molecular weight 4000) formed by sodium lignin sulfonate and acrylic acid, and putting the mixture into a pulp mixing tank for mixing to obtain pulp with solid content of 60%; conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (a grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5), the grinding speed is 1380rpm, after grinding for 30min, adding a compound formed by 36Kg of water-soluble chitosan and cationic starch (the mass ratio of the water-soluble chitosan to the cationic starch is 1).
Comparative example 3
Screening and washing raw calcium carbonate ore to obtain calcium carbonate with the purity of 96% (the micro-morphology is granular);
crushing 7 tons of calcium carbonate with the purity of 96% by a jaw crusher, then carrying out dry ball milling in a ring roller mill, and obtaining coarse powder with the particle size of 200-300 meshes by iron removal treatment;
taking 6 tons of coarse powder, 2.96 tons of water, 36Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid, and mixing in a pulp blending tank to obtain pulp with solid content of 60%; and (2) conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5).
Comparative example 4
Screening and washing wollastonite raw ore to obtain wollastonite with the purity of 96% (fibrous microstructure);
crushing 7 tons of wollastonite with the purity of 96% by using a jaw crusher, then carrying out dry ball milling in a ring roller mill, and removing iron to obtain coarse powder with the particle size of 200-300 meshes;
taking 6 tons of coarse powder, 2.96 tons of water, 36Kg of copolymer (molecular weight 4000) formed by sodium lignosulfonate and acrylic acid, and mixing in a pulp blending tank to obtain pulp with solid content of 60%; and (2) conveying the slurry to a vertical stirring mill with an alumina ceramic lining through a diaphragm pump at a feeding rate of 11Hz for wet grinding (the grinding medium is high-purity alumina ceramic balls with the particle size of 1.1mm, the filling rate is 61%, the ball-to-material ratio is 3.5).
Performance testing
Test example 1
Scanning electron microscope tests are carried out on the brucite composite materials obtained in the examples 1, 2 and 6, and the test results are shown in fig. 1-3, wherein fig. 1 is an SEM image of the brucite composite material obtained in the example 1, and it can be seen from fig. 1 that flaky kaolin and fibrous brucite are piled up mutually and have more gaps; FIG. 2 is an SEM image of the brucite composite material obtained in example 2, and it can be seen from FIG. 2 that calcium carbonate particles and flaky brucite are stacked with each other, and there are many voids, and the voids are helpful for improving the oil absorption value of the composite powder; FIG. 3 is an SEM photograph of the brucite composite obtained in example 6, and it can be seen from FIG. 3 that calcium carbonate particles, fibrous wollastonite and flaky brucite are piled up, and that many voids are observed.
Test example 2
The whiteness, oil absorption and iron content values of the composites obtained in examples 1 to 7 and comparative examples 1 to 4 were measured according to the test standard GB/T5211.
The test results are shown in table 1.
TABLE 1 test results of the composite materials obtained in examples 1 to 7 and comparative examples 1 to 4
As can be seen from Table 1, the brucite composite material obtained by the invention has higher oil absorption value.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (6)
1. A brucite composite material is characterized by comprising brucite and inorganic filler;
the inorganic filler comprises one or more of kaolin, calcium carbonate and wollastonite;
the inorganic filler and the brucite have different micro-morphologies;
the microscopic morphology of the brucite is flaky or fibrous; the micro-morphology of the kaolin is sheet-shaped; the micro-morphology of the calcium carbonate is granular; the micro appearance of the wollastonite is fibrous;
the mass ratio of the brucite to the inorganic filler is 1:3 to 6;
the particle size of the brucite composite material is 0.8 to 1.4um;
the preparation method of the brucite composite material comprises the following steps:
and mixing the brucite and the inorganic filler, and then sequentially carrying out dry grinding and wet grinding to obtain the brucite composite material.
2. A method of preparing the brucite composite material of claim 1, comprising the steps of:
mixing brucite and an inorganic filler, and then sequentially carrying out dry grinding and wet grinding to obtain the brucite composite material;
the wet-milled raw material also comprises a dispersant and a modifier.
3. The method of claim 2, wherein the dispersant comprises a copolymer of lignosulfonate and acrylic acid;
the molecular weight of the copolymer is 3500 to 4500.
4. The method of claim 2, wherein the modifier comprises water-soluble chitosan and cationic starch;
the mass ratio of the water-soluble chitosan to the cationic starch is 1:1 to 5.
5. The method according to any one of claims 2 to 4, wherein the wet grinding is performed at a rotation speed of 1300 to 1400rpm for 60 to 90min.
6. The brucite composite material of claim 1 or the brucite composite material prepared by the preparation method of any one of claims 2 to 5, and the application of the brucite composite material in a precoat of thermal paper.
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| CN111892831A (en) * | 2020-08-07 | 2020-11-06 | 江西广源化工有限责任公司 | Composite powder for electronic adhesive and preparation method and application thereof |
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| WO1998022388A1 (en) * | 1996-11-21 | 1998-05-28 | Oji-Yuka Synthetic Paper Co., Ltd. | Minute composite inorganic powder and use thereof |
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