CN114455622B - Preparation method of super-dispersed functional calcium carbonate - Google Patents
Preparation method of super-dispersed functional calcium carbonate Download PDFInfo
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 137
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 31
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 30
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000007885 magnetic separation Methods 0.000 claims abstract description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000725 suspension Substances 0.000 claims abstract description 13
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000003763 carbonization Methods 0.000 claims abstract description 11
- 239000006148 magnetic separator Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000032683 aging Effects 0.000 claims abstract description 8
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000292 calcium oxide Substances 0.000 claims abstract description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000029087 digestion Effects 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- 238000007873 sieving Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 239000002086 nanomaterial Substances 0.000 abstract 1
- 235000010216 calcium carbonate Nutrition 0.000 description 53
- 239000004033 plastic Substances 0.000 description 12
- 229920003023 plastic Polymers 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004597 plastic additive Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000006235 reinforcing carbon black Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
- C01F11/183—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/38—Particle morphology extending in three dimensions cube-like
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- 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
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Geology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention provides a preparation method of super-dispersed functional calcium carbonate, which belongs to the technical field of nano material preparation, and comprises the steps of taking calcium oxide and water to perform digestion reaction, performing magnetic separation and enrichment on the obtained slurry through a magnetic separator, collecting the outflow calcium hydroxide slurry, performing aging reaction, sieving, and adding water to dilute to obtain calcium hydroxide suspension; and adding 2-amino-2-methylpropanol into the calcium hydroxide suspension, introducing carbon dioxide gas to carry out carbonization reaction, stopping carbonization reaction when the pH value of a reaction system is reduced to 6.5-7.0, and dehydrating, drying, crushing and screening the obtained calcium carbonate slurry to obtain the super-dispersed functional calcium carbonate. According to the invention, 2-amino-2-methylpropanol is added to prepare the cubic super-dispersed functional calcium carbonate, so that the specific surface area is large, the dispersibility is good, the agglomeration is difficult to occur, and the oil absorption value is low.
Description
Technical Field
The invention relates to a preparation method of calcium carbonate, in particular to a preparation method of super-dispersed functional calcium carbonate.
Background
The light calcium carbonate has various shapes such as cubic, spindle-shaped, chain-shaped, needle-shaped, flaky, spherical and the like, and the preparation methods of the calcium carbonate with different shapes and crystal forms are different, and the corresponding application fields and functions are also different. The light calcium carbonate has the advantages of high whiteness, high purity, good dispersibility, high compatibility and rheological property, and the like, and can partially replace semi-reinforcing carbon black and white carbon black products. The nano calcium carbonate is used as filler of plastics, rubber and paper, has semi-reinforcing effect, has better dispersibility after surface treatment, and has higher cost performance when used for filler.
The nano calcium carbonate is used as an excellent plastic product additive, so that the plastic volume can be increased, and the product cost can be reduced; the dimensional stability, hardness and rigidity of the plastic are improved, and the plastic plays a role of a framework; improving the processability of the plastic, controlling the viscosity, and improving the properties of the product such as bending strength, bending elastic modulus, heat distortion temperature and the like. And when calcium carbonate with different morphologies is used as a plastic additive, the effect achieved is different. Wherein, the cubic nano calcium carbonate particles have good dispersibility and good affinity with high polymers, and are most suitable for preparing high-end plastic products.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of the super-dispersed functional calcium carbonate.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the preparation method of the super-dispersed functional calcium carbonate comprises the following steps in sequence:
1) Taking calcium oxide and water to perform digestion reaction, performing magnetic separation and enrichment on the obtained slurry through a magnetic separator, and collecting the outflow calcium hydroxide slurry;
2) Taking calcium hydroxide slurry, carrying out aging reaction, sieving, and diluting with water to obtain calcium hydroxide suspension;
3) Adding calcium hydroxide suspension into a reactor, adding 2-amino-2-methylpropanol, introducing carbon dioxide gas for carbonization reaction, and stopping carbonization reaction when the pH value of a reaction system is reduced to 6.5-7.0 to obtain calcium carbonate slurry;
4) And (3) dehydrating, drying, crushing and screening the calcium carbonate slurry to obtain the super-dispersed functional calcium carbonate.
Further, in step 1), the magnetic separation and enrichment includes the following steps:
opening exciting current, adjusting the magnetic separation intensity of the magnetic separator to 140-160 mT, and starting to inject slurry for magnetic separation and enrichment;
and (3) after the slurry is subjected to magnetic separation and enrichment, collecting the effluent, and injecting the effluent into a magnetic separator again for repeated magnetic separation, and collecting the effluent subjected to repeated magnetic separation for more than 2 times to obtain the calcium hydroxide slurry.
Further, the slurry injection rate is 30 to 40mL/s.
Further, in step 3), 2-amino-2-methylpropanol is added in an amount of 0.7 to 1.2wt% based on the weight of calcium hydroxide in the calcium hydroxide suspension.
Further, in the step 3), the temperature of the carbonization reaction is 35 to 40 ℃.
Further, in step 3), turbine stirring is adopted in the carbonization reaction process.
Further, the rotational speed of the turbine stirring is 480-500 r/min.
Further, in the step 3), the volume content of the carbon dioxide gas in the reactor is 25 to 30%.
Further, in step 2), the concentration of calcium hydroxide in the calcium hydroxide suspension is 12 to 15wt%.
Further, in the step 1), the weight-volume ratio of the calcium oxide to the water is 1: 7-8;
the temperature of digestion reaction is 80-85 ℃;
in the step 2), the time of the aging reaction is 9-10 hours;
the sieve pore diameter of the sieve is 180-200 meshes.
The preparation method of the super-dispersed functional calcium carbonate has the beneficial effects that:
the invention takes 2-amino-2-methylpropanol as a crystal form control agent, and has two groups of hydroxyl and amino in the structural formula, wherein the hydroxyl can have strong electrostatic matching effect with calcium ions, and is combined with the calcium ions to occupy the active center of calcium carbonate crystal growth, thereby inhibiting the growth of calcium carbonate particles; meanwhile, the amino group has stronger chelation effect, can be chelated with calcium carbonate particles, and increases the steric hindrance of the calcium carbonate particles, thereby inhibiting the growth of the calcium carbonate particles; according to the invention, 2-amino-2-methylpropanol is added to prepare the cubic super-dispersed functional calcium carbonate, so that the specific surface area is large, the dispersibility is good, the agglomeration is not easy to occur, and the oil absorption value is low;
according to the invention, the magnesium, iron, manganese and other elements in the slurry are adsorbed by adopting a magnetic separation enrichment method, so that metal elements in the calcium hydroxide slurry are fundamentally removed, the metal content in the prepared super-dispersed functional calcium carbonate is effectively reduced, the whiteness of the calcium carbonate is improved, and meanwhile, the formation of a cubic crystal form of the calcium carbonate is facilitated;
according to the invention, through selecting proper technological parameters, the formation of cubic calcium carbonate is effectively controlled, and the preparation method has good dispersibility; when the cube-shaped calcium carbonate prepared by the invention is used as a filler to prepare plastics, the cube-shaped calcium carbonate can be well dispersed in the plastics and can be used as stress concentration points to induce a large number of silver marks, so that impact energy is absorbed, and the toughness of the composite material is increased; meanwhile, the cubic calcium carbonate can also play a role of a crosslinking point, and when the cubic calcium carbonate is subjected to tensile stress, the crosslinking point has a balance effect of stress concentration and stress radiation, and can play a role of uniformly distributing stress by absorbing external energy and radiation energy, so that the tensile strength of the composite material is kept from being reduced.
Drawings
FIG. 1 is a structural representation of the ultra-dispersed functional calcium carbonate prepared in example 1 of the present invention.
Detailed Description
The following description of the technical solution in the embodiments of the present invention is clear and complete. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Example 1 preparation method of ultra-dispersed functional calcium carbonate
The embodiment is a preparation method of super-dispersed functional calcium carbonate, and the specific preparation process comprises the following steps in sequence:
1) Adding 1kg of calcium oxide into 7kg of water with the temperature of 85 ℃ for digestion reaction to obtain slurry;
opening exciting current, adjusting the magnetic separation intensity of the magnetic separator to 150mT, and starting to inject slurry for magnetic separation;
after the slurry is magnetically separated, collecting the effluent, and then injecting the effluent into a magnetic separator for repeated magnetic separation, and collecting the effluent (the embodiment is magnetically separated for 2 times) with repeated magnetic separation for more than 2 times, namely the calcium hydroxide slurry.
After most elements such as magnesium, iron, manganese and the like are effectively adsorbed by the magnetic separator under specific magnetic separation strength, the obtained calcium hydroxide slurry almost has no metal elements, is favorable for the formation of the crystal form of the follow-up cubic calcium carbonate, and can reduce the metal content in the prepared calcium carbonate and improve the whiteness of the calcium carbonate.
2) Directly standing and ageing the calcium hydroxide slurry for 9 hours (without heating in the standing and ageing process, naturally cooling to room temperature), filtering by a 200-mesh sieve to remove insoluble impurities and agglomerated particles so as to avoid influencing the formation of cubic calcium carbonate crystals, and adding water to prepare the calcium hydroxide suspension with the concentration of 14 wt%.
3) Adding the calcium hydroxide suspension into a reaction kiln, heating to 35 ℃, starting turbine stirring at the rotating speed of 500r/min, adding 1.0wt% of 2-amino-2-methylpropanol (the addition amount of the 2-amino-2-methylpropanol is 1.0wt% of the weight of calcium hydroxide in the calcium hydroxide suspension), then introducing carbon dioxide gas, keeping the volume content of carbon dioxide in the reaction kiln at 28%, continuing stirring at the rotating speed of 500r/min at the temperature of 35 ℃, and stopping carbonization reaction when the pH value of the reaction system is reduced to 6.5, thus obtaining calcium carbonate slurry;
in the reaction process, a turbine stirring method is adopted, so that the fluid in the reaction kiln can be ensured to be in a radial popular flowing state, the circulation rate is high, and calcium hydroxide and carbon dioxide can be conveniently and fully contacted to form a cubic calcium carbonate crystal.
4) Taking out the calcium carbonate slurry, dehydrating, drying, crushing and screening to obtain the super-dispersed functional calcium carbonate, wherein the N1 is marked as the structural characterization chart of the super-dispersed functional calcium carbonate, and the structural characterization chart is shown in figure 1.
According to general Industrial precipitated calcium carbonate (HG/T2226-20)10 The ultra-dispersed functional calcium carbonate prepared in this example was measured to have a specific surface area of 38.2m 2 The whiteness per gram is 95.3, the iron content is 0.001%, the manganese content is 0.001%, the lead content is 0.0003%, the chromium content is 0.0002%, and the oil absorption value is 15.7%.
Examples 2 to 6 Process for the preparation of ultra-dispersed functional calcium carbonate
Examples 2 to 6 are a preparation method of ultra-dispersed functional calcium carbonate, respectively, and the steps are basically the same as those of example 1, except that the raw material consumption and the process parameters are different, and the specific details are shown in table 1:
table 1 list of process parameters in examples 2 to 6
The other parts of examples 2 to 6 are the same as in example 1.
Experimental example 1 determination of Property of ultra-dispersed functional calcium carbonate
Comparative examples 1 to 4 are comparative tests of the process for preparing ultra-dispersed functional calcium carbonate in example 1, differing only in that:
comparative example 1 without addition of 2-amino-2-methylpropanol, the resulting super-dispersed functional calcium carbonate was labeled DN1 and had a specific surface area of 10.7m 2 The whiteness is 95.2, the iron content is 0.001%, the manganese content is 0.002%, the lead content is 0.0002%, the chromium content is 0.0001%, and the oil absorption value is 54.9%;
in comparative example 2, the aging reaction was directly carried out without magnetic separation and enrichment, the obtained super-dispersed functional calcium carbonate was labeled as DN2, and the specific surface area was 35.2m 2 The whiteness per gram is 93.9, the iron content is 0.07%, the manganese content is 0.008%, the lead content is 0.0010%, the chromium content is 0.0005%, and the oil absorption value is 25.7%.
The co-operation units were commissioned to prepare polypropylene plastics by using the ultra-dispersed functional calcium carbonates N1 to N6, DN1 to DN2 and commercial nano calcium carbonate prepared in examples 1 to 6 and comparative examples 1 to 2 as additives (the addition amount is 7 wt%), and the corresponding polypropylene plastics were tested for performance according to the polypropylene (PP) resin (GB/T12670-2008), and specific test results were as follows:
TABLE 2 list of rubber product Performance test results
| Group of | Impact Strength (kJ/m) 2 ) | Flexural modulus (MPa) | Tensile Strength (MPa) |
| Example 1 | 16.23 | 989.21 | 34.13 |
| Example 2 | 15.74 | 976.31 | 33.87 |
| Example 3 | 15.21 | 962.94 | 34.21 |
| Example 4 | 15.98 | 981.52 | 33.17 |
| Example 5 | 16.02 | 973.96 | 33.62 |
| Example 6 | 15.73 | 969.41 | 34.06 |
| Comparative example 1 | 11.24 | 762.14 | 27.73 |
| Comparative example 2 | 14.47 | 924.92 | 31.89 |
| Commercial nano calcium carbonate | 11.83 | 798.24 | 28.01 |
As can be seen from Table 2, the ultra-dispersed functional calcium carbonate prepared by the invention can obviously improve the impact strength, bending model and tensile strength of polypropylene plastics.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (7)
1. The preparation method of the ultra-dispersed functional cubic calcium carbonate is characterized by comprising the following steps of:
1) Taking calcium oxide and water to perform digestion reaction, performing magnetic separation and enrichment on the obtained slurry through a magnetic separator, and collecting the outflow calcium hydroxide slurry;
in step 1), the magnetic separation and enrichment comprises the following steps:
opening exciting current, adjusting the magnetic separation intensity of the magnetic separator to 140-160 mT, and starting to inject slurry for magnetic separation and enrichment;
after the slurry is subjected to magnetic separation and enrichment, collecting effluent, and then injecting the effluent into a magnetic separator again for repeated magnetic separation, and collecting the effluent subjected to repeated magnetic separation for more than 2 times to obtain calcium hydroxide slurry;
2) Taking calcium hydroxide slurry, carrying out aging reaction, sieving, and diluting with water to obtain calcium hydroxide suspension; the aperture diameter of the screened sieve holes is 180-200 meshes;
3) Adding calcium hydroxide suspension into a reactor, adding 2-amino-2-methylpropanol, introducing carbon dioxide gas for carbonization reaction, and stopping carbonization reaction when the pH value of a reaction system is reduced to 6.5-7.0 to obtain calcium carbonate slurry; the addition amount of the 2-amino-2-methylpropanol is 0.7-1.2wt% of the weight of the calcium hydroxide in the calcium hydroxide suspension; the temperature of the carbonization reaction is 35-40 ℃;
4) And (3) dehydrating, drying, crushing and screening the calcium carbonate slurry to obtain the super-dispersed functional cubic calcium carbonate.
2. The method for producing a super-dispersed functional cubic calcium carbonate according to claim 1, wherein the slurry is injected at a rate of 30 to 40ml/s.
3. The method for preparing the ultra-dispersed functional cubic calcium carbonate according to claim 1 or 2, wherein in the step 3), turbine stirring is adopted in the carbonization reaction process.
4. The method for preparing the ultra-dispersed functional cubic calcium carbonate according to claim 3, wherein the rotational speed of turbine stirring is 480-500 r/min.
5. The method for producing a super-dispersed functional cubic calcium carbonate according to claim 1, 2 or 4, wherein the volume content of carbon dioxide gas in the reactor in step 3) is 25 to 30%.
6. The method for producing a super-dispersed functional cubic calcium carbonate according to claim 1, 2 or 4, wherein the concentration of calcium hydroxide in the calcium hydroxide suspension in step 2) is 12 to 15wt%.
7. The method for producing a super-dispersed functional cubic calcium carbonate according to claim 1, 2 or 4,
in the step 1), the weight-volume ratio of the calcium oxide to the water is 1: 7-8;
the temperature of the digestion reaction is 80-85 ℃;
in the step 2), the aging reaction time is 9-10 h.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003137548A (en) * | 2001-10-24 | 2003-05-14 | Nittetsu Mining Co Ltd | Method for manufacturing titanium oxide-calcium carbonate composite grain |
| CN107021515A (en) * | 2017-04-25 | 2017-08-08 | 井陉县天顺钙业有限公司 | Control precipitated calcium carbonate length of particle than method |
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