CN114229857A - Production process of white carbon black special for printing ink - Google Patents
Production process of white carbon black special for printing ink Download PDFInfo
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- CN114229857A CN114229857A CN202111622773.XA CN202111622773A CN114229857A CN 114229857 A CN114229857 A CN 114229857A CN 202111622773 A CN202111622773 A CN 202111622773A CN 114229857 A CN114229857 A CN 114229857A
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- carbon black
- white carbon
- solution
- sodium silicate
- pulping
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000006229 carbon black Substances 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000004537 pulping Methods 0.000 claims abstract description 71
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000003607 modifier Substances 0.000 claims abstract description 6
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 74
- 239000000047 product Substances 0.000 claims description 60
- 239000004115 Sodium Silicate Substances 0.000 claims description 56
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 56
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 56
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 42
- 239000002002 slurry Substances 0.000 claims description 32
- 230000001276 controlling effect Effects 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 21
- -1 polyethylene Polymers 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 229920000573 polyethylene Polymers 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 238000001694 spray drying Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000945 filler Substances 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 description 16
- 235000012239 silicon dioxide Nutrition 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000012716 precipitator Substances 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
- C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
-
- 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
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- 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
- C01P2006/12—Surface area
-
- 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
- C01P2006/90—Other properties not specified above
Abstract
A production process of white carbon black special for printing ink comprises the following steps: a) synthesis reaction, b) filtering and pulping, c) drying, d) modifier treatment and e) crushing treatment. The white carbon black special for the printing ink prepared by the production process has high quality, is designed for the printing ink, has the hydrophobicity of 40-50, can effectively improve the physical and chemical properties of the printing ink when being added into the printing ink, has a good three-dimensional network structure, is large in specific surface area and high in activity, and can form a network structure when the printing ink is dried, so that the performances of the printing ink, such as storage stability, printing adaptability and the like, are improved; meanwhile, the strength and the smoothness of the ink are improved, particularly, the adsorption force and the filler dispersibility of the ink are greatly improved, and the printing effect is very good.
Description
Technical Field
The invention relates to the field of white carbon black production, in particular to a production process of white carbon black special for printing ink.
Background
The ink is an important material for printing, is a viscous colloidal fluid, and expresses patterns and characters on a printing stock by printing or painting. As social demands increase, ink varieties and yields also expand and grow accordingly. A certain amount of white carbon black is generally added into the existing ink to improve the physical and chemical properties of the ink, such as adsorption force and filler dispersibility.
The existing white carbon black is generally prepared by a traditional precipitation method, sodium silicate solution and sulfuric acid are used as raw materials, and the white carbon black can be obtained through steps of synthesis, washing, refining, drying and the like. Therefore, the white carbon black for the printing ink needs to be produced urgently. Therefore, the production of white carbon black for printing ink is imminent.
Disclosure of Invention
The invention provides a production process of white carbon black special for ink, which aims to overcome the defects that the white carbon black prepared by the existing production process is not designed aiming at the ink, so that the effect of improving the physicochemical property of the ink is not ideal, and particularly the adsorption force and the filler dispersibility effect of the ink are not good.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a production process of white carbon black special for printing ink comprises the following steps: a) a synthetic reaction, namely placing a sodium silicate solution with the concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-55 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, and controlling the reaction through the flow regulation of the two solutions until the pH value of the reaction solution is 3.0-6.0 to obtain a first dilute slurry; b) filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, controlling the solid content of the white carbon black filter cake to be 10-20% and the sulfate content to be below 0.5%, and pulping by using a pulping machine to obtain a second thin slurry; c) drying, namely conveying the second dilute slurry into a drying tower for spray drying so that the moisture content of the dried white carbon black product is controlled within 3% to obtain a first white carbon black finished product; d) treating a modifier, namely putting a certain amount of polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to 110 +/-5 ℃, putting a first white carbon black finished product after the polyethylene wax is completely melted, starting stirring for 0.5-1 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 10-20% of that of the white carbon black product; e) and (4) crushing, namely crushing the second white carbon black finished product to the particle size of 3-5 mu m by using a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 40-50.
Further, the first thin slurry in step a) is produced by a plurality of stepwise syntheses, specifically as follows: 1) placing a sodium silicate solution with the preparation concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-30 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be 10-30 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the reacted solution is 5.0-7.0, and obtaining a first solution after the reaction; 2) standing the first solution in the reaction kettle for a period of time, and after the first solution becomes gel, carrying out aging treatment on the first solution, wherein the aging time is controlled to be 0.5-1.0 hour; 3) quickly and uniformly scattering gel liquid in a reaction kettle, quickly heating the reaction kettle to 50 +/-5 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.1-1.0mol/L and a dilute sulfuric acid solution with the mass fraction of 5% -10% under the condition of ensuring constant temperature, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 3.0-6.0 to obtain a first dilute slurry.
Further, the pulping treatment in the step b) is a three-stage pulping treatment, firstly, the white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine to prepare primary pulp, and the rotating speed of the primary pulping machine is controlled to be 60-100 revolutions per minute; then, the primary pulp is subjected to secondary pulping operation through a secondary pulping machine to prepare intermediate pulp, and the rotating speed of the secondary pulping machine is controlled to be 80-120 r/min; and finally, carrying out third pulping operation on the medium-grade pulp through a three-stage pulping machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-stage pulping machine is controlled at 100-140 rpm, and the high-grade pulp is the second thin pulp.
Further, the step a) is preceded by a purification treatment of the sodium silicate solution to remove impurities and heavy metals from the sodium silicate solution.
Further, in the step e), the second white carbon black finished product is firstly coarsely pulverized by a jet mill, and then the coarsely pulverized second white carbon black finished product is finely pulverized by an ultrafine pulverizer, so that the particle size of the final second white carbon black finished product is 3-5 μm.
By adopting the technical scheme, the white carbon black special for the printing ink has the beneficial effects that the white carbon black prepared by the production process has high quality, is designed for the printing ink, has the hydrophobicity reaching 40-50, can effectively improve the physical and chemical properties of the printing ink when being added into the printing ink, has a good three-dimensional network structure, is large in specific surface area and high in activity, and can form a network structure when the printing ink is dried, so that the performances of the printing ink, such as storage stability, printing adaptability and the like, are improved; meanwhile, the strength and the smoothness of the ink are improved, particularly, the adsorption force and the filler dispersibility of the ink are greatly improved, and the printing effect is very good.
Drawings
FIG. 1 is a schematic diagram of the process of the present invention.
FIG. 2 is a schematic view of another process flow of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example one
Reference is made to figure 1. A production process of white carbon black special for printing ink comprises the following steps: a) a synthetic reaction, namely placing a sodium silicate solution with the preparation concentration of 0.1mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 50 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5% under the condition of stirring the sodium silicate solution, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 6.0 +/-0.5 to obtain a first dilute slurry; the first thin slurry is produced by adopting a mode of gradually synthesizing for many times, and the specific mode is as follows: 1) placing a sodium silicate solution with the preparation concentration of 0.1mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 30 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 30 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the reacted solution reaches 7.0, and obtaining a first solution after the reaction is finished; 2) standing the first solution in the reaction kettle for a period of time, and after the first solution becomes gel, carrying out aging treatment on the first solution, wherein the aging time is controlled to be 0.5 hour; 3) quickly and uniformly scattering gel liquid in the reaction kettle, quickly heating the reaction kettle to about 50 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.1mol/L and a dilute sulfuric acid solution with the mass fraction of 10% under the condition of ensuring constant temperature, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 6.0 +/-0.5 to obtain a first dilute slurry.
b) Filtering and pulping, namely filtering and washing the first thin slurry by using a plate-and-frame filter press, controlling the solid content of the white carbon black filter cake to be 10% and the sulfate content to be below 0.5%, and pulping by using a pulping machine to obtain a second thin slurry; the pulping treatment is three-stage pulping treatment, firstly, carrying out primary pulping operation on the white carbon black filter cake through a primary pulping machine to prepare primary pulp, wherein the rotating speed of the primary pulping machine is controlled at 60 revolutions per minute; then, the primary pulp is subjected to secondary pulping operation through a secondary pulping machine to prepare intermediate pulp, and the rotating speed of the secondary pulping machine is controlled at 80 revolutions per minute; and finally, carrying out third pulping operation on the medium-grade pulp through a three-stage pulping machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-stage pulping machine is controlled at 100 revolutions per minute, and the high-grade pulp is the second thin pulp.
c) Drying, namely conveying the second dilute slurry into a drying tower for spray drying so that the moisture content of the dried white carbon black product is controlled within 3% to obtain a first white carbon black finished product; the silicon dioxide also needs strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then the silicon dioxide finished product is packed and bagged; the method for removing iron by strong magnetism comprises the following steps: the strong magnetic rod is arranged on the discharge port of the packaging machine, and the strong magnetic action is carried out on the silicon dioxide through the strong magnetic rod, so that the magnetic metal impurities in the silicon dioxide are effectively removed.
d) And (2) treating the modifier, namely putting a certain amount of polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to about 105 ℃, putting the first white carbon black finished product after the polyethylene wax is completely melted, starting stirring for 1 hour, and obtaining a second white carbon black finished product, wherein the mass of the polyethylene wax is 10 percent of that of the white carbon black product.
e) And (4) crushing, namely crushing the second white carbon black finished product to the particle size of 3 mu m by using a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 40. And the second white carbon black finished product is firstly coarsely crushed by a jet mill, and then is finely crushed by an ultrafine crusher, so that the particle size of the second white carbon black finished product is 3 μm finally.
Example two
Reference is made to figure 1. A production process of white carbon black special for printing ink comprises the following steps: a) a synthetic reaction, namely placing a sodium silicate solution with the preparation concentration of 1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 10 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 10% under the condition of stirring the sodium silicate solution, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 3.0 +/-0.5 to obtain a first dilute slurry; the first thin slurry is produced by adopting a mode of gradually synthesizing for many times, and the specific mode is as follows: 1) placing a sodium silicate solution with the preparation concentration of 1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 10 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 10 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the reacted solution is 5.0 +/-0.5, and obtaining a first solution after the reaction is finished; 2) standing the first solution in the reaction kettle for a period of time, and after the first solution becomes gel, carrying out aging treatment on the first solution, wherein the aging time is controlled to be 1.0 hour; 3) quickly and uniformly scattering gel liquid in the reaction kettle, quickly heating the reaction kettle to about 45 ℃, simultaneously adding a sodium silicate solution with the concentration of 1.0mol/L and a dilute sulfuric acid solution with the mass fraction of 5% under the condition of ensuring constant temperature, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 3.0 +/-0.5 to obtain a first dilute slurry.
b) Filtering and pulping, namely filtering and washing the first thin slurry by using a plate-and-frame filter press, controlling the solid content of the white carbon black filter cake to be 20% and the sulfate content to be less than 0.5%, and pulping by using a pulping machine to obtain a second thin slurry; the pulping treatment is three-stage pulping treatment, firstly, carrying out primary pulping operation on the white carbon black filter cake through a primary pulping machine to prepare primary pulp, wherein the rotating speed of the primary pulping machine is controlled at 100 revolutions per minute; then, the primary pulp is subjected to secondary pulping operation through a secondary pulping machine to prepare intermediate pulp, and the rotating speed of the secondary pulping machine is controlled at 120 r/min; and finally, carrying out third pulping operation on the medium-grade pulp through a three-stage pulping machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-stage pulping machine is controlled at 140 revolutions per minute, and the high-grade pulp is the second thin pulp.
c) Drying, namely conveying the second dilute slurry into a drying tower for spray drying so that the moisture content of the dried white carbon black product is controlled within 3% to obtain a first white carbon black finished product; the silicon dioxide also needs strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then the silicon dioxide finished product is packed and bagged; the method for removing iron by strong magnetism comprises the following steps: the strong magnetic rod is arranged on the discharge port of the packaging machine, and the strong magnetic action is carried out on the silicon dioxide through the strong magnetic rod, so that the magnetic metal impurities in the silicon dioxide are effectively removed.
d) And (2) treating the modifier, namely putting a certain amount of polyethylene wax into a high-speed mixing device (such as a high-speed mixer), heating to about 115 ℃, putting the first white carbon black finished product after the polyethylene wax is completely melted, starting stirring for 0.5 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 20 percent of the mass of the white carbon black product.
e) And (4) crushing, namely crushing the second white carbon black finished product to 5 mu m in particle size by using a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 50. And the second white carbon black finished product is firstly coarsely crushed by a jet mill, and then is finely crushed by an ultrafine crusher, so that the particle size of the second white carbon black finished product is 5 μm finally.
EXAMPLE III
Reference is made to figure 2. A production process of white carbon black special for printing ink comprises the following steps: it comprises the following steps:
a) and (4) purifying to remove impurities and heavy metals in the sodium silicate solution. The purification treatment mode is as follows: 1) introducing the sodium silicate solution into a microporous filter (such as with the aperture of 0.2-1 um) for filtering to obtain a first sodium silicate solution so as to remove solid impurities in the first sodium silicate solution; 2) placing the first sodium silicate filtrate in a reaction kettle, then adding a precipitator (such as sodium sulfide) into the reaction kettle under the condition of stirring the first sodium silicate filtrate, wherein the addition amount of the precipitator is 4-6% (the optimal value is 5%) of the mass of the first filtrate, stopping stirring after a preset stirring time is obtained to obtain a second sodium silicate solution, the stirring time in the reaction kettle is controlled to be 35-55 minutes (the optimal time is 45 minutes), and the temperature in the reaction kettle is controlled to be 55-65 ℃ (the optimal temperature is 60 ℃); the aim is to react iron ions and other metal ions with a precipitator to produce solid particles with larger particle size; 3) and (3) deeply filtering the second sodium silicate solution precision filter (the medium is activated carbon) to eliminate metal impurities (such as iron ions) existing in an ionic state in the first filtrate to obtain high-purity sodium silicate. The purification treatment mode is ideal, and a mode combining physical impurity removal filtration and chemical impurity removal filtration is adopted, so that solid impurities in the sodium silicate solution and metal impurities existing in an ionic state are greatly removed, and the quality of the sodium silicate is greatly improved.
b) A synthetic reaction, namely placing a sodium silicate solution with the preparation concentration of 0.6mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 45 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 8% under the condition of stirring the sodium silicate solution, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 5.0 +/-0.5 to obtain a first dilute slurry; the first thin slurry is produced by adopting a mode of gradually synthesizing for many times, and the specific mode is as follows: 1) placing a sodium silicate solution with the preparation concentration of 0.6mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be about 20 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 8% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be about 20 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the reacted solution reaches 6.0, and obtaining a first solution after the reaction is finished; 2) standing the first solution in the reaction kettle for a period of time, and after the first solution becomes gel, carrying out aging treatment on the first solution, wherein the aging time is controlled to be 0.8 hour; 3) quickly and uniformly scattering gel liquid in the reaction kettle, quickly heating the reaction kettle to about 45 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.6mol/L and a dilute sulfuric acid solution with the mass fraction of 8% under the condition of ensuring constant temperature, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 5.0 +/-0.5 to obtain a first dilute slurry.
c) Filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, and controlling the solid content of the white carbon black filter cake to be 15% and the sulfate content to be below 0.5%; pulping by a pulping machine to obtain second thin pulp; the specific operation is as follows: and filtering (i.e. coarse filtering) the first dilute slurry by using a plate-and-frame filter press to obtain a concentrated slurry, and then conveying the concentrated slurry to a membrane filter press to perform secondary filtering (i.e. fine filtering) to obtain the white carbon black filter cake. Two-step filtering operation, namely the operation mode of combining rough filtering and fine filtering, is adopted, and the filtering and washing treatment effect is good. The pulping treatment is three-stage pulping treatment, firstly, carrying out primary pulping operation on the white carbon black filter cake through a primary pulping machine to prepare primary pulp, wherein the rotating speed of the primary pulping machine is controlled at 80 revolutions per minute; then, the primary pulp is subjected to secondary pulping operation through a secondary pulping machine to prepare intermediate pulp, and the rotating speed of the secondary pulping machine is controlled at 100 revolutions per minute; and finally, carrying out third pulping operation on the medium-grade pulp through a three-stage pulping machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-stage pulping machine is controlled at 120 revolutions per minute, and the high-grade pulp is the second thin pulp.
d) Drying, namely conveying the second dilute slurry into a drying tower for spray drying so that the moisture content of the dried white carbon black product is controlled within 3% to obtain a first white carbon black finished product; the silicon dioxide also needs strong magnetic iron removal treatment to obtain a silicon dioxide finished product with strong anti-caking capacity and strong fluidity, and then the silicon dioxide finished product is packed and bagged; the method for removing iron by strong magnetism comprises the following steps: the strong magnetic rod is arranged on the discharge port of the packaging machine, and the strong magnetic action is carried out on the silicon dioxide through the strong magnetic rod, so that the magnetic metal impurities in the silicon dioxide are effectively removed.
e) And (2) treating the modifier, namely putting a certain amount of polyethylene wax into a high-speed mixing device (such as a high-speed mixer), heating to about 110 ℃, putting the first white carbon black finished product after the polyethylene wax is completely melted, starting stirring for 0.6 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 15 percent of the mass of the white carbon black product.
f) And (3) crushing, namely crushing the second white carbon black finished product to the particle size of 4 mu m by using a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 45. And the second white carbon black finished product is firstly coarsely crushed by a jet mill, and then is finely crushed by an ultrafine crusher, so that the particle size of the second white carbon black finished product is 4 μm finally.
In addition, the purification treatment may be performed in the following manner: under the condition of stirring the sodium silicate solution, adding a flocculating agent with the preparation concentration of 0.15% into the sodium silicate solution with the preparation concentration of 1.0mol/L, and filtering out impurities precipitated from the sodium silicate solution by using a plate frame after uniformly stirring for 1.2 hours to obtain the high-purity 1.0mol/L sodium silicate solution so as to remove the impurities and heavy metals in the sodium silicate solution; the flocculant can be inorganic salt flocculant such as polyaluminium sulfate, polysilicic acid or aluminum silicate and the like.
The test results of the white carbon black finished product prepared by the above embodiment are listed in the following table:
| name of item | Example one | Example two | EXAMPLE III |
| Silicon dioxide content (based on the product after ignition)% | 98.5 | 98.9 | 99.5 |
| Square meter with specific surface area per gram | 280 | 300 | 350 |
| Degree of hydrophobicity | 40 | 50 | 45 |
| Total iron (Fe) content mg/kg is less than or equal to | 300 | 200 | 100 |
| The content of heavy metal As is less than or equal to mg/kg | 0.5 | 0.35 | 0.15 |
| The content of heavy metal Pb in mg/kg is less than or equal to | 0.8 | 0.6 | 0.4 |
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (5)
1. A production process of white carbon black special for printing ink is characterized by comprising the following steps: it comprises the following steps: a) a synthetic reaction, namely placing a sodium silicate solution with the concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-55 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, and controlling the reaction through the flow regulation of the two solutions until the pH value of the reaction solution is 3.0-6.0 to obtain a first dilute slurry; b) filtering and pulping, namely performing plate-frame filtering and washing treatment on the first thin slurry, controlling the solid content of the white carbon black filter cake to be 10-20% and the sulfate content to be below 0.5%, and pulping by using a pulping machine to obtain a second thin slurry; c) drying, namely conveying the second dilute slurry into a drying tower for spray drying so that the moisture content of the dried white carbon black product is controlled within 3% to obtain a first white carbon black finished product; d) treating a modifier, namely putting a certain amount of polyethylene wax into high-speed mixing equipment (such as a high-speed mixer), heating to 110 +/-5 ℃, putting a first white carbon black finished product after the polyethylene wax is completely melted, starting stirring for 0.5-1 hour to obtain a second white carbon black finished product, wherein the mass of the polyethylene wax is 10-20% of that of the white carbon black product; e) and (4) crushing, namely crushing the second white carbon black finished product to the particle size of 3-5 mu m by using a crusher to obtain a final white carbon black finished product, wherein the hydrophobicity of the final white carbon black finished product can reach 40-50.
2. The production process of the white carbon black special for the printing ink according to claim 1, which is characterized by comprising the following steps of: the first thin slurry in the step a) is produced by adopting a mode of multiple stepwise synthesis, and the specific mode is as follows: 1) placing a sodium silicate solution with the preparation concentration of 0.1-1.0mol/L into a reaction kettle, controlling the temperature of the sodium silicate solution in the reaction kettle to be 10-30 ℃, slowly adding a dilute sulfuric acid solution with the mass fraction of 5-10% under the condition of stirring the sodium silicate solution, controlling the reaction temperature to be 10-30 ℃ through cooling water, stopping adding the sulfuric acid solution until the pH value of the reacted solution is 5.0-7.0, and obtaining a first solution after the reaction; 2) standing the first solution in the reaction kettle for a period of time, and after the first solution becomes gel, carrying out aging treatment on the first solution, wherein the aging time is controlled to be 0.5-1.0 hour; 3) quickly and uniformly scattering gel liquid in a reaction kettle, quickly heating the reaction kettle to 50 +/-5 ℃, simultaneously adding a sodium silicate solution with the concentration of 0.1-1.0mol/L and a dilute sulfuric acid solution with the mass fraction of 5% -10% under the condition of ensuring constant temperature, and regulating and controlling the reaction through the flow of the two solutions until the pH value of the reaction solution is 3.0-6.0 to obtain a first dilute slurry.
3. The production process of the white carbon black special for the printing ink according to claim 1, which is characterized by comprising the following steps of: the pulping treatment in the step b) is three-stage pulping treatment, firstly, the white carbon black filter cake is subjected to primary pulping operation through a primary pulping machine to prepare primary pulp, and the rotating speed of the primary pulping machine is controlled to be 60-100 r/min; then, the primary pulp is subjected to secondary pulping operation through a secondary pulping machine to prepare intermediate pulp, and the rotating speed of the secondary pulping machine is controlled to be 80-120 r/min; and finally, carrying out third pulping operation on the medium-grade pulp through a three-stage pulping machine to obtain high-grade pulp with high uniformity, wherein the rotating speed of the three-stage pulping machine is controlled at 100-140 rpm, and the high-grade pulp is the second thin pulp.
4. The production process of the white carbon black special for the printing ink according to claim 1, which is characterized by comprising the following steps of: the step a) is also required to be carried out with purification treatment on the sodium silicate solution before the step a) so as to remove impurities and heavy metals in the sodium silicate solution.
5. The production process of the white carbon black special for the printing ink according to claim 1, which is characterized by comprising the following steps of: in the step e), the second white carbon black finished product is firstly coarsely ground by a jet mill, and then the coarsely ground second white carbon black finished product is finely ground by an ultrafine grinder, so that the particle size of the final second white carbon black finished product is 3-5 μm.
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