CN116971204A - Low-fluorescence calcium carbonate for papermaking and preparation method and application thereof - Google Patents
Low-fluorescence calcium carbonate for papermaking and preparation method and application thereof Download PDFInfo
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- CN116971204A CN116971204A CN202310942957.7A CN202310942957A CN116971204A CN 116971204 A CN116971204 A CN 116971204A CN 202310942957 A CN202310942957 A CN 202310942957A CN 116971204 A CN116971204 A CN 116971204A
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- calcium carbonate
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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 284
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 142
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 88
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000002002 slurry Substances 0.000 claims abstract description 48
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000000498 ball milling Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 239000002270 dispersing agent Substances 0.000 claims description 18
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- 239000003240 coconut oil Substances 0.000 claims description 8
- 235000019864 coconut oil Nutrition 0.000 claims description 8
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 6
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- 235000011008 sodium phosphates Nutrition 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 150000003384 small molecules Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 18
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 15
- 239000000126 substance Substances 0.000 description 9
- 239000012634 fragment Substances 0.000 description 8
- 239000004579 marble Substances 0.000 description 8
- 230000000844 anti-bacterial effect Effects 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000001238 wet grinding Methods 0.000 description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 4
- 238000010009 beating Methods 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000006081 fluorescent whitening agent Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000007850 fluorescent dye Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 210000002249 digestive system Anatomy 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001917 fluorescence detection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides low-fluorescence calcium carbonate for papermaking and a preparation method and application thereof, belonging to the field of preparation of inorganic nonmetallic mineral powder. The preparation method comprises the following steps: mixing and ball milling raw calcium carbonate ore and No. 1 grinding aid to obtain calcium carbonate powder; and (3) removing the No. 1 grinding aid in the calcium carbonate powder, mixing the calcium carbonate powder with water to obtain a pre-grinding slurry, and mixing and grinding the pre-grinding slurry and the No. 2 grinding aid to obtain the calcium carbonate slurry. The calcium carbonate powder and the calcium carbonate slurry are used for papermaking, and the obtained paper has no fluorescent effect, so that the problem that the existing calcium carbonate product has more fluorescent material sources and cannot meet the paper production standard is effectively solved.
Description
Technical Field
The invention relates to the field of preparation of inorganic nonmetallic mineral powder, in particular to low-fluorescence calcium carbonate for papermaking and a preparation method and application thereof.
Background
Paper is closely related to daily life, and is seen everywhere in production and life, paper industry in China has been developed for many years, paper tableware is various, and now in the food field, paper tableware has replaced partial plastic tableware, such as paper straw, paper packaging cutlery box and the like, and the connection between paper and food is more and more tight, and higher requirements are also put forward on the safety of paper. In the early days, the napkin contains a large amount of fluorescent whitening agent when exposed to light, and the napkin cannot contain the fluorescent whitening agent because the fluorescent whitening agent in the napkin contains benzene, naphthalene and other groups, is easy to absorb by mucous membrane tissues of the digestive system of a human body, is not easy to decompose and has a cancerogenic risk. Along with the improvement of the living standard of people, the health consciousness is stronger, the requirements on paper products are higher and higher, and part of paper enterprises have higher enterprise standards and require strict control from paper raw materials.
And calcium carbonate is the first large filler used in papermaking, and the technical index requirements of many paper enterprises on upstream calcium carbonate provider products comprise detection of fluorescent substances of the products. Not all raw materials for papermaking generate fluorescence, certain conditions are necessary for generating the fluorescence, the fluorescence is related to the self molecular structure of the substance, and the substance which generally contains conjugated pi bonds in the molecule, has the characteristics of rigid plane structure and the like is easy to generate the fluorescence. The calcium carbonate for papermaking in the market is mostly heavy calcium carbonate produced by physical grinding, the detection of fluorescent substances in calcium carbonate products is a common phenomenon, the detection is a great technical problem faced by calcium carbonate additive manufacturing enterprises, the sources of the fluorescent substances in the calcium carbonate products are various, the introduction of the fluorescent substances in raw ores and the processing process account for main reasons, wherein the raw ores can avoid the appearance of the fluorescent substances through mineral separation, the processing process usually involves the addition of grinding aids, part of the common grinding aids contain rigid structures of conjugated double bonds, and the introduction of the aids can lead to the fluorescent reaction of the calcium carbonate products. How to provide low-fluorescence calcium carbonate for papermaking and a preparation method and application thereof is a problem to be solved by the technicians in the field.
Disclosure of Invention
The invention aims to provide low-fluorescence calcium carbonate for papermaking as well as a preparation method and application thereof, so as to solve the problem that fluorescent substances are commonly existed in the existing calcium carbonate products for papermaking and the production requirement of paper towels is difficult to meet.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of low-fluorescence calcium carbonate for papermaking, which comprises the following steps:
1) Mixing and ball milling raw calcium carbonate ore and No. 1 grinding aid to obtain calcium carbonate powder;
2) Removing the No. 1 grinding aid in the calcium carbonate powder, mixing the calcium carbonate powder with water to obtain pre-grinding slurry, mixing the pre-grinding slurry with the No. 2 grinding aid, and grinding to obtain calcium carbonate slurry;
the low fluorescence papermaking calcium carbonate comprises calcium carbonate powder and calcium carbonate slurry.
Preferably, the grinding aid No. 1 in the step 1) comprises one or two of coconut oil, ethylene glycol and propylene glycol; the calcium carbonate content of the raw calcium carbonate ore is more than or equal to 97 percent; the mass ratio of the No. 1 grinding aid to the raw calcium carbonate ore is 0.8-1.2: 100.
preferably, the mass fraction of the coconut oil in the grinding aid No. 1 is 50-60%.
Preferably, the particle size of the calcium carbonate powder in the step 1) is 550-650 meshes.
Preferably, the solid content of the pre-ground pulp in the step 2) is 70-80%;
the No. 2 grinding aid comprises an inorganic small molecular dispersing agent and an organic dispersing agent, wherein the mass ratio of the inorganic small molecular dispersing agent to the organic dispersing agent is 0.5-1: 1.
preferably, the inorganic small molecule dispersant comprises one or more of sodium phosphate, sodium tripolyphosphate and sodium hexametaphosphate; the organic dispersing agent comprises one or more of starch, isopropanol and hydroxypropyl methyl cellulose.
Preferably, in the step 2), the mass ratio of the No. 2 grinding aid to the calcium carbonate powder is 0.8-1.2: 100.
preferably, the solid content of the calcium carbonate slurry in the step 2) is 70-75%, and the fineness of the calcium carbonate slurry is less than 2 μm, and the content of particles is more than or equal to 95%.
The invention provides low-fluorescence calcium carbonate for papermaking.
The invention also provides application of the low-fluorescence papermaking calcium carbonate in papermaking, wherein the calcium carbonate powder is used for filling paper, and the calcium carbonate slurry is used for coating the surface of the paper.
The invention has at least the following beneficial effects:
1. the grinding aid selected by the invention has no fluorescence phenomenon, the grinding efficiency can be improved by mixing a plurality of grinding aids, the auxiliary coconut oil component for dry grinding has natural comprehensive antibacterial capability, and the mildew-proof and antibacterial effects of the paper can be improved by adding the calcium carbonate ground by the grinding aid into the paper.
2. According to the invention, the grinding aid in the dry powder is separated in the preparation process and then subjected to wet grinding, so that the influence of the No. 1 grinding aid on the preparation of the calcium carbonate slurry by subsequent grinding can be reduced.
3. The calcium carbonate product has low fluorescent substance content, and paper made by adding the calcium carbonate product into paper pulp fibers has no fluorescent appearance through fluorescent equipment detection.
Detailed Description
The invention provides a preparation method of low-fluorescence calcium carbonate for papermaking, which comprises the following steps:
1) Mixing and ball milling raw calcium carbonate ore and No. 1 grinding aid to obtain calcium carbonate powder;
2) Removing the No. 1 grinding aid in the calcium carbonate powder, mixing the calcium carbonate powder with water to obtain pre-grinding slurry, mixing the pre-grinding slurry with the No. 2 grinding aid, and grinding to obtain calcium carbonate slurry;
the low fluorescence papermaking calcium carbonate comprises calcium carbonate powder and calcium carbonate slurry.
In the invention, the grinding aid No. 1 in the step 1) comprises one or two of coconut oil, ethylene glycol and propylene glycol; the calcium carbonate content of the raw calcium carbonate ore is more than or equal to 97%, preferably 97.5-99.5%, more preferably 98-99%, and even more preferably 98.5%; the mass ratio of the No. 1 grinding aid to the raw calcium carbonate ore is 0.8-1.2: 100, preferably 0.9 to 1.1:100, more preferably 0.95 to 1.5:100, more preferably 1:100.
in the present invention, the particle size of the raw calcium carbonate ore in the step 1) is 4 to 7cm, preferably 5 to 6cm.
In the present invention, the mass fraction of coconut oil in the grinding aid No. 1 is 50 to 60%, preferably 52 to 58%, more preferably 54 to 56%, and even more preferably 55%.
In the present invention, the particle size of the calcium carbonate powder in the step 1) is 550 to 650 mesh, preferably 570 to 630 mesh, more preferably 590 to 610 mesh, and even more preferably 595 to 605 mesh.
In the present invention, the solid content of the pre-ground slurry in the step 2) is 70 to 80%, preferably 72 to 78%, and more preferably 74 to 76%.
In the invention, the No. 2 grinding aid comprises an inorganic small molecular dispersing agent and an organic dispersing agent, wherein the mass ratio of the inorganic small molecular dispersing agent to the organic dispersing agent is 0.5-1: 1, preferably 0.6 to 0.9:1, more preferably 0.7 to 0.8:1.
in the present invention, the method for removing the grinding aid No. 1 in the step 2) is heating and removing, wherein the heating temperature is 150-200 ℃, preferably 160-190 ℃, more preferably 170-180 ℃, and the heating time is 5-10 min, preferably 6-9 min, more preferably 7-8 min.
In the invention, the inorganic small molecular dispersing agent comprises one or more of sodium phosphate, sodium tripolyphosphate and sodium hexametaphosphate; the organic dispersing agent comprises one or more of starch, isopropanol and hydroxypropyl methyl cellulose.
In the invention, the mass ratio of the No. 2 grinding aid to the calcium carbonate powder in the step 2) is 0.8-1.2: 100, preferably 0.9 to 1.1:100, more preferably 0.95 to 1.05:100, more preferably 1:100.
in the present invention, the solid content of the calcium carbonate slurry in the step 2) is 70 to 75%, preferably 71 to 74%, and more preferably 72 to 73%; the fineness of the particles in the calcium carbonate slurry is not less than 95%, preferably 95 to 99%, more preferably 96 to 98%, and even more preferably 97 to 98% of the fineness of the particles in the calcium carbonate slurry is not more than 2. Mu.m.
In the invention, the grinding devices in the step 1) and the step 2) are ceramic lining devices, and the grinding media are ceramic balls.
The invention provides low-fluorescence calcium carbonate for papermaking, which comprises calcium carbonate powder and calcium carbonate slurry.
The invention also provides application of the low-fluorescence papermaking calcium carbonate in papermaking, wherein the calcium carbonate powder is used for filling paper, and the calcium carbonate slurry is used for coating the surface of the paper.
In the invention, the calcium carbonate powder material with 25-30% of the pulp mass is added in the paper making process, and the calcium carbonate powder material with 27-29% of the pulp mass is preferably added.
In the present invention, the calcium carbonate slurry is used in combination with a coating liquid for coating the surface of paper, and the calcium carbonate slurry is 80 to 90% by mass, preferably 83 to 88% by mass, and more preferably 85% by mass of the total system.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Selecting marble raw ore with 98% calcium carbonate content, crushing the marble raw ore into fragments with the particle size of 4-7 cm by adopting a jaw crusher, and mixing the fragments with the mass ratio of 1: and (3) mixing the coconut oil of the step (1) with glycerol to obtain a grinding aid No. 1. The mass ratio is 1.2:100 No. 1 grinding aid is mixed with raw calcium carbonate ore with the grain diameter of 4-7 cm, and the mixture is subjected to dry ball milling in a grinding machine with a ceramic lining by taking ceramic balls as grinding media, so as to obtain calcium carbonate powder with the grain diameter of 600 meshes.
A portion of the calcium carbonate powder was dried at 180℃for 10min and then mixed with water to give a pre-ground slurry having a solids content of 73%. The mass ratio is 1:1 and hydroxypropyl methyl cellulose, mixing the No. 2 grinding aid with the mass of the calcium carbonate powder accounting for 1.1 percent, mixing the No. 2 grinding aid with the pre-grinding slurry, and carrying out wet grinding in a ceramic lining grinding machine by taking ceramic balls as grinding media to obtain the calcium carbonate slurry with the particle size of less than 2 mu m accounting for 95 percent of the total particle amount.
And (3) taking the calcium carbonate powder prepared in the process that the beating degree is 45 SR and the dissociated pulp fiber is added with 30% of the total mass of the calcium carbonate powder in the stirring process, and carrying out sheet making on a sheet making machine to obtain paper. Coating a coating liquid consisting of 90wt% of calcium carbonate slurry, 0.25wt% of sodium carboxymethyl cellulose and 9.75wt% of Tao Shiding benzene latex on the surface of the obtained paper, and drying to obtain the finished paper. And detecting the fluorescence effect and the antibacterial property of the fluorescent dye.
Example 2
Selecting marble raw ore with 97% calcium carbonate content, crushing the marble raw ore into fragments with the particle size of 4-7 cm by adopting a jaw crusher, and mixing the fragments with the mass ratio of 6:4 and ethylene glycol to obtain the No. 1 grinding aid. The mass ratio is 1:100 No. 1 grinding aid is mixed with raw calcium carbonate ore with the grain diameter of 4-7 cm, and the mixture is subjected to dry ball milling in a grinding machine with a ceramic lining by taking ceramic balls as grinding media, so as to obtain calcium carbonate powder with the grain diameter of 600 meshes.
A portion of the calcium carbonate powder was dried at 200℃for 6min and then mixed with water to give a pre-ground slurry with a solids content of 72%. The mass ratio is 0.5:1 sodium hexametaphosphate and isopropanol to obtain a No. 2 grinding aid, mixing the No. 2 grinding aid with the mass of the calcium carbonate powder accounting for 1.2 percent with the pre-grinding slurry, and carrying out wet grinding in a ceramic lining grinding machine by taking ceramic balls as grinding media to obtain calcium carbonate slurry with the particle size of less than 2 mu m accounting for 95 percent of the total particle amount.
And (3) taking the calcium carbonate powder prepared in the process that the beating degree is 45 SR and the dissociated pulp fiber is added with 27% of the total mass of the calcium carbonate powder in the stirring process, and carrying out sheet making on a sheet making machine to obtain paper. Coating a coating liquid consisting of 85 weight percent of calcium carbonate slurry, 0.25 weight percent of sodium carboxymethyl cellulose and 14.75 weight percent of Tao Shiding benzene latex on the surface of the obtained paper, and drying to obtain the finished paper. And detecting the fluorescence effect and the antibacterial property of the fluorescent dye.
Example 3
Selecting marble raw ore with 98.5% calcium carbonate content, crushing the marble raw ore into fragments with the particle size of 4-7 cm by adopting a jaw crusher, and mixing the fragments with the mass ratio of 5.8:4.2 and ethylene glycol to obtain the No. 1 grinding aid. The mass ratio is 0.9:100 No. 1 grinding aid is mixed with raw calcium carbonate ore with the particle size of 4-7 cm, and the mixture is subjected to dry ball milling in a grinding machine with a ceramic lining by taking ceramic balls as grinding media, so as to obtain calcium carbonate powder with the particle size of 630 meshes.
A portion of the calcium carbonate powder was dried at 200℃for 6 minutes and then mixed with water to give a pre-ground slurry having a solids content of 76%. The mass ratio is 0.7:1 sodium hexametaphosphate and isopropanol to obtain a No. 2 grinding aid, mixing the No. 2 grinding aid with the mass of the calcium carbonate powder accounting for 1.0 percent with the pre-grinding slurry, and carrying out wet grinding in a ceramic lining grinding machine by taking ceramic balls as grinding media to obtain calcium carbonate slurry with the particle size of less than 2 mu m accounting for 96.3 percent of the total particle amount.
And (3) taking the calcium carbonate powder prepared in the process that the beating degree is 45 SR and the dissociated pulp fiber is added with 25% of the total mass of the calcium carbonate powder in the stirring process, and carrying out sheet making on a sheet making machine to obtain paper. Coating a coating liquid consisting of 88 weight percent of calcium carbonate slurry, 0.25 weight percent of sodium carboxymethyl cellulose and 11.75 weight percent of Tao Shiding benzene latex on the surface of the obtained paper, and drying to obtain the finished paper.
Example 4
Selecting marble raw ore with 97% calcium carbonate content, crushing the marble raw ore into fragments with the particle size of 4-7 cm by adopting a jaw crusher, and mixing the fragments with the mass ratio of 6:4 and glycerol to obtain the grinding aid No. 1. The mass ratio is 1.1:100 No. 1 grinding aid is mixed with raw calcium carbonate ore with the grain diameter of 4-7 cm, and the mixture is subjected to dry ball milling in a grinding machine with a ceramic lining by taking ceramic balls as grinding media, so as to obtain calcium carbonate powder with the grain diameter of 600 meshes.
A portion of the calcium carbonate powder was dried at 180 ℃ for 8min and then mixed with water to give a pre-ground slurry with a solids content of 72%. The mass ratio is 0.5:1 sodium hexametaphosphate and starch are mixed to obtain a No. 2 grinding aid, the No. 2 grinding aid accounting for 1.2 percent of the mass of the calcium carbonate powder is mixed with pre-grinding slurry, and wet grinding is carried out in a ceramic lining grinding machine by taking ceramic balls as grinding media, so that calcium carbonate slurry with the particle size of less than 2 mu m accounting for 96.8 percent of the total particle amount is obtained.
And (3) taking the calcium carbonate powder prepared in the process that the beating degree is 45 SR and the dissociated pulp fiber is added with 28% of the total mass of the calcium carbonate powder in the stirring process, and carrying out sheet making on a sheet making machine to obtain paper. Coating a coating liquid consisting of 83 weight percent of calcium carbonate slurry, 0.25 weight percent of sodium carboxymethyl cellulose and 16.75 weight percent of Tao Shiding benzene latex on the surface of the obtained paper, and drying to obtain the finished paper.
Comparative example 1
The comparative example differs from example 1 only in that a commercial Guangxi Kelong 600 mesh heavy calcium carbonate powder and a Dongsheng new material grade 95 calcium carbonate slurry were selected for papermaking, and the fluorescence effect and the antibacterial performance thereof were examined.
In the above examples, the antibacterial detection standard was QB/T2591-2003, and the fluorescence detection standard was GB/T5009.78-2003.
Table 1 results of the final paper properties test prepared in examples and comparative examples
As can be seen from Table 1, the paper prepared from the low fluorescence papermaking calcium carbonate material prepared by the present invention has not only no significant fluorescence effect but also excellent antibacterial properties as compared with the paper prepared from the commercial calcium carbonate material.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The preparation method of the low-fluorescence calcium carbonate for papermaking is characterized by comprising the following steps of:
1) Mixing and ball milling raw calcium carbonate ore and No. 1 grinding aid to obtain calcium carbonate powder;
2) Removing the No. 1 grinding aid in the calcium carbonate powder, mixing the calcium carbonate powder with water to obtain pre-grinding slurry, mixing the pre-grinding slurry with the No. 2 grinding aid, and grinding to obtain calcium carbonate slurry;
the low fluorescence papermaking calcium carbonate comprises calcium carbonate powder and calcium carbonate slurry.
2. The method for preparing low fluorescence papermaking calcium carbonate according to claim 1, wherein the grinding aid No. 1 in the step 1) comprises one or two of coconut oil, ethylene glycol and propylene glycol; the calcium carbonate content of the raw calcium carbonate ore is more than or equal to 97 percent; the mass ratio of the No. 1 grinding aid to the raw calcium carbonate ore is 0.8-1.2: 100.
3. the method for preparing low-fluorescence papermaking calcium carbonate according to claim 2, wherein the mass fraction of coconut oil in the No. 1 grinding aid is 50-60%.
4. The method for preparing low fluorescence calcium carbonate for papermaking according to claim 2 or 3, wherein the particle size of the calcium carbonate powder in the step 1) is 550-650 mesh.
5. The method for preparing low fluorescence calcium carbonate for papermaking according to claim 4, wherein the solid content of the pre-ground pulp in the step 2) is 70-80%;
the No. 2 grinding aid comprises an inorganic small molecular dispersing agent and an organic dispersing agent, wherein the mass ratio of the inorganic small molecular dispersing agent to the organic dispersing agent is 0.5-1: 1.
6. the method for preparing low-fluorescence papermaking calcium carbonate according to claim 5, wherein the inorganic small-molecule dispersant comprises one or more of sodium phosphate, sodium tripolyphosphate and sodium hexametaphosphate; the organic dispersing agent comprises one or more of starch, isopropanol and hydroxypropyl methyl cellulose.
7. The method for preparing low-fluorescence papermaking calcium carbonate according to claim 6, wherein the mass ratio of the No. 2 grinding aid to the calcium carbonate powder in the step 2) is 0.8-1.2: 100.
8. the method according to any one of claims 5 to 7, wherein the solid content of the calcium carbonate slurry in the step 2) is 70 to 75%, and the fineness of the calcium carbonate slurry is not less than 95% of the particle content of 2 μm or less.
9. The low-fluorescence papermaking calcium carbonate prepared by the method for preparing low-fluorescence papermaking calcium carbonate according to any one of claims 1-8.
10. Use of a low fluorescence papermaking calcium carbonate according to claim 9, characterised in that calcium carbonate powder is used for filling of paper and calcium carbonate slurry is used for coating of paper surface.
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