CN109516486B - Preparation method of light calcium carbonate for carbonless copy paper - Google Patents
Preparation method of light calcium carbonate for carbonless copy paper Download PDFInfo
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- CN109516486B CN109516486B CN201811558936.0A CN201811558936A CN109516486B CN 109516486 B CN109516486 B CN 109516486B CN 201811558936 A CN201811558936 A CN 201811558936A CN 109516486 B CN109516486 B CN 109516486B
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- calcium carbonate
- lime milk
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- carbonless copy
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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 175
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 85
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 41
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 41
- 239000004571 lime Substances 0.000 claims abstract description 41
- 235000013336 milk Nutrition 0.000 claims abstract description 41
- 239000008267 milk Substances 0.000 claims abstract description 41
- 210000004080 milk Anatomy 0.000 claims abstract description 41
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 32
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 20
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000019738 Limestone Nutrition 0.000 claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 12
- 230000029087 digestion Effects 0.000 claims abstract description 12
- 239000006028 limestone Substances 0.000 claims abstract description 12
- -1 magnesium ion compound Chemical class 0.000 claims abstract description 12
- CDOUZKKFHVEKRI-UHFFFAOYSA-N 3-bromo-n-[(prop-2-enoylamino)methyl]propanamide Chemical compound BrCCC(=O)NCNC(=O)C=C CDOUZKKFHVEKRI-UHFFFAOYSA-N 0.000 claims abstract description 11
- FCYKAQOGGFGCMD-UHFFFAOYSA-N Fulvic acid Natural products O1C2=CC(O)=C(O)C(C(O)=O)=C2C(=O)C2=C1CC(C)(O)OC2 FCYKAQOGGFGCMD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims abstract description 11
- 229940095100 fulvic acid Drugs 0.000 claims abstract description 11
- 239000002509 fulvic acid Substances 0.000 claims abstract description 11
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000007873 sieving Methods 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000001354 calcination Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000007603 infrared drying Methods 0.000 claims abstract description 9
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 10
- PUKLDDOGISCFCP-JSQCKWNTSA-N 21-Deoxycortisone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)C)(O)[C@@]1(C)CC2=O PUKLDDOGISCFCP-JSQCKWNTSA-N 0.000 claims description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 5
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 25
- 239000002245 particle Substances 0.000 abstract description 18
- 238000009826 distribution Methods 0.000 abstract description 11
- 238000011161 development Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 3
- 235000010216 calcium carbonate Nutrition 0.000 description 71
- 239000011248 coating agent Substances 0.000 description 20
- 238000000576 coating method Methods 0.000 description 20
- 239000000047 product Substances 0.000 description 12
- 239000000049 pigment Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N Lactic Acid Natural products CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- KKTCWAXMXADOBB-UHFFFAOYSA-N azanium;hydrogen carbonate;hydrate Chemical compound [NH4+].O.OC([O-])=O KKTCWAXMXADOBB-UHFFFAOYSA-N 0.000 description 1
- 238000010533 azeotropic distillation Methods 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000011858 nanopowder Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000007039 two-step reaction Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
-
- 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
- D21H19/385—Oxides, hydroxides or carbonates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation method of light calcium carbonate for carbonless copy paper, which comprises the steps of calcining limestone to prepare quicklime, carrying out digestion reaction on the quicklime and water to generate lime milk, sieving by a 100-mesh sieve, and preparing 10-100g/L lime milk; heating lime milk to 40-90 ℃, adding a magnesium ion compound and dioctyl sodium sulfosuccinate and/or fulvic acid compound agent into the lime milk, introducing carbon dioxide, stirring at high speed in the carbonation reaction process, and stopping reaction when the pH of a reaction solution is reduced to 7-8 to obtain calcium carbonate slurry; and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at the temperature of 60-80 ℃ to obtain the light calcium carbonate product for the carbonless copy paper. The calcium carbonate prepared by the method has good dispersibility and narrow particle size distribution, and the color development optical density, the surface strength and the paper napping strength of the carbonless copy paper are improved when the calcium carbonate is applied to the carbonless copy paper.
Description
Technical Field
The invention relates to the technical field of calcium carbonate, in particular to a preparation method of light calcium carbonate for carbonless copy paper.
Background
Calcium carbonate is the most common mineral on the surface, but not all calcium carbonates are of value in the paper industry. Calcium carbonate is divided in the paper industry into fillers (GCC) and coating Pigments (PCC), which has earlier been used as a paper filler and pigment than GCC. The PCC particles have loose structures, rough appearance and special morphological characteristics. Compared with GCC, PCC has a high coefficient of astigmatism, giving filled paper better bulk, optical properties and retention. Domestic coating grade PCC is used in small amounts due to the high production cost and price of PCC. However, the superiority of PCC in paper coating is not comparable with GCC. In the future, more paper making enterprises may use PCC as a coating pigment. Researches show that the smoothness and the aging resistance of a paper coating can be improved by properly adding the ultrafine PCC, the absorptivity, the tightness, the opacity and the coating pore structure of the ink are improved, the roughness is reduced, and the water retention value of the coating is improved. The quality requirements for PCC coating pigments vary from paper grade to paper grade. Generally, the smaller the average particle size of PCC, the narrower the particle size distribution is, the more advantageous the smoothness, sizing and surface strength of the coated paper.
The carbonless copy paper is called carbonless paper or pressure-sensitive recording paper for short, is a new type of copy paper, and possesses the functions of direct copying and direct colour development. The carbonless copy paper is filled with PCC and covers the uneven surface of the base paper, so that the whiteness and the opacity of the paper can be improved, the smoothness and the glossiness of the paper surface are improved, the surface of the paper sheet has uniform and good ink absorbability, and finally, a good printing effect is obtained. Most precipitated calcium carbonate generally has the problems of wide particle size distribution, serious agglomeration and the like, and causes adverse effects on the processing and application of coated carbonless copy paper.
CN103923489A discloses a method for preparing a super-dispersible suspended calcium carbonate emulsion, which comprises the steps of preparing calcium carbonate powder into slurry with a certain solid content on the basis of obtaining the calcium carbonate powder by dry grinding, adding a super-dispersant in the process of preparing the slurry, and simultaneously adding a polyethylene glycol wetting agent and a titanate and aluminate composite coupling agent; and carrying out wet grinding by using the prepared slurry. The calcium carbonate produced by the method has high fineness and good dispersibility. However, the slurry added with a reagent such as polyethylene glycol is not suitable for industrial production because the slurry is likely to generate foam and corrode production equipment.
CN1253373C discloses a method for producing ultrafine calcium carbonate dispersible particles by a two-step reaction of first preparing uniform cubic precipitated calcium carbonate as seeds under conditions exceeding the critical supersaturation degree, and then in a second step, adding a reaction rate controlling agent to adjust the reaction conditions and perform crystal growth on the surface of the seed calcium carbonate. Thereby obtaining the superfine calcium carbonate with controllable granularity and uniform granularity distribution. The method of the invention is suitable for various existing reaction devices, no additional device is needed, the dosage of the additive used in the process is very small, and the obtained product has controllable particle size and particle size distribution. However, the calcium carbonate prepared by carbonizing the seed crystal has more intergrowth and agglomeration of particles, and the product is not suitable for being applied to the paper-making coating industry.
CN107758718A discloses a method for preparing superfine calcium carbonate nano-powder by calcite, which comprises the steps of crushing calcite, sieving, removing impurities, adding deionized water for digestion, and performing primary aging to obtain primary aged slurry; adding absolute ethyl alcohol into the ammonium bicarbonate water solution to obtain an ammonium bicarbonate alcohol water solution; under rapid and violent stirring, rapidly spraying the primary aged slurry and an ammonium bicarbonate alcohol aqueous solution into a reactor to generate white precipitates, rapidly adding a large amount of deionized water to dilute the precipitates, and performing secondary aging on the slurry; and (3) dehydrating after secondary aging, re-dispersing the obtained solid precipitate in deionized water, adding zinc sulfate into the slurry, stirring for 10min, adding phosphoric acid, introducing carbon dioxide for secondary carbonization under continuous stirring, filtering, washing and drying the slurry after secondary carbonization to obtain a precipitate, mixing the precipitate with n-butyl alcohol, and performing reduced pressure azeotropic distillation dehydration to obtain the superfine nano calcium carbonate powder. The method needs a large amount of deionized water, has very high cost, and can obtain a finished product by diluting the calcium carbonate suspension in a large amount and then drying the calcium carbonate suspension, so that the energy consumption is very high and the economic benefit is greatly reduced.
CN100509631C discloses a preparation method of light calcium carbonate for carbonless copy paper, which comprises adding a dispersant into silicon oxide slurry, grinding, adding calcium hydroxide slurry, and carbonizing to obtain the light calcium carbonate. The method can make the carbonless copy paper develop color faster. However, the method has complex operation flow and large addition amount of silicon oxide, and influences the purity of the product.
CN102502748B discloses a method for preparing rose-shaped calcium carbonate by microwave, wherein the precipitated calcium carbonate can be used as a high-quality pigment and filler and applied to industries such as papermaking, coating, plastics, rubber and the like. However, the calcium carbonate prepared by the method has a plurality of aggregates, and has adverse effects on the color development uniformity and the surface strength of the carbonless copy paper.
CN102674423B discloses a preparation method of flake-shaped superfine calcium carbonate for papermaking coating, the flake-shaped superfine calcium carbonate produced by the invention has small average diameter and thin thickness, the whiteness and the oil absorption value reach the national standard, and the flake-shaped superfine calcium carbonate can replace kaolin to be used as pigment for papermaking coating, thereby bringing economic benefit to enterprises. However, the method has great process difficulty, is not easy to control the particle size of the product, has certain disadvantages of fluidity and spindle-shaped calcium carbonate, and is not beneficial to the running of a high-speed paper machine.
CN101113004A discloses calcium carbonate for carbonless copy paper coating, preparation and application thereof, and the calcium carbonate prepared by the method can improve the smoothness and color development speed of carbonless copy paper. However, in the method, the crystal seeds are used for preparing the calcium carbonate, so that the calcium carbonate crystals are easy to agglomerate and grow, the particle size distribution is widened, and the surface strength of the carbonless copy paper is adversely affected.
According to the above, the calcium carbonate used for preparing the pigment of the coated paper at present has the defects of wide particle size distribution, poor dispersibility and the like, and causes the mechanical property and the processing property of the coated paper to be reduced. The light calcium carbonate with narrow particle size distribution, small average particle size and good dispersibility is prepared by the method and applied to the carbonless copy paper, so that the coated paper has excellent color rendering property and surface strength.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims at solving the problems of calcium carbonate for coating paper pigment and provides a preparation method of light calcium carbonate for carbonless copy paper. The method uses limestone as a raw material, calcines and digests the limestone to obtain calcium hydroxide slurry, adopts a bubbling carbonization method, improves the dispersion performance of calcium carbonate through the inhibition effect of magnesium ions on the growth of calcium carbonate crystals and the steric hindrance caused by the absorption of dioctyl sodium sulfosuccinate and/or fulvic acid on the crystal faces of the calcium carbonate, obtains PCC with narrow particle size distribution, and improves the color rendering performance and the paper napping strength of the coated carbonless copy paper.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) calcining limestone at the temperature of 1000-1200 ℃ for 200-300 minutes to prepare quicklime, carrying out digestion reaction on the quicklime and water to generate lime milk, and sieving by a 100-mesh sieve to prepare 10-100g/L lime milk;
(2) heating lime milk to 40-90 ℃, adding a magnesium ion compound and dioctyl sodium sulfosuccinate and/or fulvic acid compound agent into the lime milk, introducing carbon dioxide, stirring at high speed in the carbonation reaction process, and stopping reaction when the pH of a reaction solution is reduced to 7-8 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at the temperature of 60-80 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
Further, the mass ratio of the quicklime to the water in the digestion reaction is 1:6-8, stirring is carried out at room temperature, and the stirring speed is controlled to be 100-.
Furthermore, the addition amount of the compound agent is 0.3-3% of the weight of the lime milk.
Further, the weight ratio of the magnesium ion compound to the dioctyl sodium sulfosuccinate is 1-4: 1.
further, the weight ratio of the magnesium ion compound, the dioctyl sodium sulfosuccinate and the fulvic acid in the compound agent is 1-4: 1:1-2.
Further, the weight ratio of the magnesium ion compound to the fulvic acid in the compound agent is 1-3: 1.
further, the magnesium ion compound is one or more of magnesium carbonate, magnesium chloride and magnesium sulfate.
Further, the concentration of the carbon dioxide in the step (2) is 20-30%, and the reaction temperature is controlled at 20-30 ℃.
Further, the high-speed stirring speed is 300r/min-500 r/min.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the invention uses limestone as raw material, calcines and digests to obtain calcium hydroxide slurry, adopts bubbling carbonization method, improves the dispersion property of calcium carbonate by the inhibiting effect of magnesium ions on the growth of calcium carbonate crystal and the steric hindrance caused by the absorption of fulvic acid and/or dioctyl sodium sulfosuccinate on the crystal face of calcium carbonate, obtains PCC with narrow particle size distribution, and has good application prospect.
2. The calcium carbonate prepared by the invention is applied to the carbonless copy paper, and the color development optical density, the surface strength and the paper napping strength of the carbonless copy paper are improved.
3. The method has the advantages of simple and feasible process, low production cost, suitability for industrial production and better economic and social benefits.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Example 1
A preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) crushing limestone to 10-15cm, calcining at 1150 ℃ for 300 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:6 to generate lime milk, and sieving with a 100-mesh sieve to prepare 20g/L lime milk;
(2) heating lime milk to 50 ℃, adding 1% of magnesium chloride and 1% of dioctyl sodium sulfosuccinate by weight of the lime milk into the lime milk, introducing 20% of carbon dioxide, keeping the stirring speed at 300r/min, and stopping reaction when the pH of a reaction solution is reduced to 7.5 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at the temperature of 60 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
Example 2
A preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) crushing limestone to 10-15cm, calcining at 1050 ℃ for 300 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:8 to generate lime milk, and sieving with a 100-mesh sieve to prepare 50g/L lime milk;
(2) heating lime milk to 70 ℃, adding 1% of magnesium sulfate, 0.3% of dioctyl sodium sulfosuccinate and 0.5% of fulvic acid, which are 1% of the weight of the lime milk, into the lime milk, introducing 25% of carbon dioxide, keeping the stirring speed at 350r/min, and stopping reaction when the pH value of a reaction solution is reduced to 7 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at 70 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
Example 3
A preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) crushing limestone to 10-15cm, calcining at 1200 ℃ for 200 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:7 to generate lime milk, and sieving with a 100-mesh sieve to prepare 100g/L lime milk;
(2) heating lime milk to 60 ℃, adding magnesium sulfate accounting for 0.35 percent of the weight of the lime milk and fulvic acid accounting for 0.1 percent of the weight of the lime milk into the lime milk, introducing carbon dioxide with the concentration of 30 percent, keeping the stirring speed at 500r/min, and stopping reaction when the pH value of a reaction solution is reduced to 8 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at 80 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
Comparative example 1
A preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) crushing limestone to 10-15cm, calcining at 1150 ℃ for 300 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:6 to generate lime milk, and sieving with a 100-mesh sieve to prepare 20g/L lime milk;
(2) heating lime milk to 50 ℃, introducing 20% carbon dioxide, keeping the stirring speed at 300r/min, and stopping reaction when the pH of the reaction liquid is reduced to 7.5 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at the temperature of 60 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
Comparative example 2
A preparation method of light calcium carbonate for carbonless copy paper comprises the following steps:
(1) crushing limestone to 10-15cm, calcining at 1050 ℃ for 300 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:8 to generate lime milk, and sieving with a 100-mesh sieve to prepare 50g/L lime milk;
(2) heating lime milk to 70 ℃, introducing 25% carbon dioxide, keeping the stirring speed at 350r/min, and stopping reaction when the pH of the reaction liquid is reduced to 7 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at 70 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
After the calcium carbonate finished product prepared in the above examples is subjected to coating experiment and test according to the method: 50 parts of calcium carbonate, 70 parts of water, 30 parts of kaolin (prepared into liquid), 5 parts of oxidized starch, 5 parts of styrene-butadiene latex, 5 parts of color developing agent and 0.5 part of sodium polyacrylate. The paint is prepared by mixing the pigment and various auxiliary agents in a certain order. Taking the prepared coating, manually coating the coating at the speed of 2m/s by using a No. 0 press roll according to the coating weight of 55 g/square meter, and carrying out carbon-free copy paper performance detection after drying, wherein the test results are shown in Table 1.
Table 1: test effect of calcium carbonate prepared by embodiment of the invention applied to carbon paper
As can be seen from the above table, the light calcium carbonate prepared by the method of the invention has smaller average particle size, narrow particle size distribution, low viscosity of prepared coating, moderate water retention value compared with the calcium carbonate prepared by the common method (comparative example), is beneficial to the operation of a high-speed paper machine, can reduce the energy consumption of the paper machine, and has better economic benefit. Compared with common light calcium carbonate, the color development density and the surface strength of the coated carbonless copy paper are obviously improved, and the quality of the carbonless copy paper is greatly improved.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (2)
1. A preparation method of light calcium carbonate for carbonless copy paper is characterized by comprising the following steps:
(1) calcining limestone at the temperature of 1000-1200 ℃ for 200-300 minutes to prepare quicklime, carrying out digestion reaction on the quicklime and water to generate lime milk, and sieving by a 100-mesh sieve to prepare 10-100g/L lime milk;
(2) heating lime milk to 40-90 ℃, adding a magnesium ion compound, dioctyl sodium sulfosuccinate and fulvic acid compound agent into the lime milk, introducing carbon dioxide, stirring at a high speed in the carbonation reaction process, and stopping reaction when the pH value of a reaction solution is reduced to 7-8 to obtain calcium carbonate slurry;
(3) washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at the temperature of 60-80 ℃ to obtain a light calcium carbonate product for the carbonless copy paper;
the addition amount of the compound agent is 0.3-3% of the weight of the lime milk;
the weight ratio of the magnesium ion compound, the dioctyl sodium sulfosuccinate and the fulvic acid of the compound agent is 1-4: 1: 1-2;
the magnesium ion compound is one or more of magnesium carbonate, magnesium chloride and magnesium sulfate;
the mass ratio of the quicklime to the water in the digestion reaction is 1:6-8, stirring is carried out at room temperature, and the stirring speed is controlled to be 100-150 r/min;
in the step (2), the concentration of carbon dioxide is 20-30%, and the reaction temperature is controlled at 20-30 ℃;
the high-speed stirring speed is 300r/min-500 r/min.
2. A preparation method of light calcium carbonate for carbonless copy paper is characterized by comprising the following steps:
(1) crushing limestone to 10-15cm, calcining at 1050 ℃ for 300 minutes to obtain quicklime, carrying out digestion reaction on the quicklime and water according to the proportion of 1:8 to generate lime milk, and sieving with a 100-mesh sieve to prepare 50g/L lime milk;
(2) heating lime milk to 70 ℃, adding 1% of magnesium sulfate, 0.3% of dioctyl sodium sulfosuccinate and 0.5% of fulvic acid, which are 1% of the weight of the lime milk, into the lime milk, introducing 25% of carbon dioxide, keeping the stirring speed at 350r/min, and stopping reaction when the pH value of a reaction solution is reduced to 7 to obtain calcium carbonate slurry;
(3) and washing and filtering the calcium carbonate slurry by using absolute ethyl alcohol, and performing infrared drying at 70 ℃ to obtain the light calcium carbonate product for the carbonless copy paper.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103539188A (en) * | 2013-10-30 | 2014-01-29 | 成都新柯力化工科技有限公司 | Preparation method of calcium carbonate fibers |
| CN106456505A (en) * | 2014-04-17 | 2017-02-22 | 荷兰联合利华有限公司 | Solid oral care compositions |
| CN106517285A (en) * | 2016-11-21 | 2017-03-22 | 广西华纳新材料科技有限公司 | Method for preparing bar-shaped nanometer calcium carbonate |
| CN106634049A (en) * | 2016-11-21 | 2017-05-10 | 广西华纳新材料科技有限公司 | Method for preparing nano calcium carbonate for weather-resistant ink |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103539188A (en) * | 2013-10-30 | 2014-01-29 | 成都新柯力化工科技有限公司 | Preparation method of calcium carbonate fibers |
| CN106456505A (en) * | 2014-04-17 | 2017-02-22 | 荷兰联合利华有限公司 | Solid oral care compositions |
| CN106517285A (en) * | 2016-11-21 | 2017-03-22 | 广西华纳新材料科技有限公司 | Method for preparing bar-shaped nanometer calcium carbonate |
| CN106634049A (en) * | 2016-11-21 | 2017-05-10 | 广西华纳新材料科技有限公司 | Method for preparing nano calcium carbonate for weather-resistant ink |
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