CN114892445A - Special light-weight coated paper for water-based ink digital printing, coating material and application thereof - Google Patents
Special light-weight coated paper for water-based ink digital printing, coating material and application thereof Download PDFInfo
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- CN114892445A CN114892445A CN202210495967.6A CN202210495967A CN114892445A CN 114892445 A CN114892445 A CN 114892445A CN 202210495967 A CN202210495967 A CN 202210495967A CN 114892445 A CN114892445 A CN 114892445A
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- coating
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- coated paper
- starch
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- 239000011248 coating agent Substances 0.000 title claims abstract description 137
- 238000000576 coating method Methods 0.000 title claims abstract description 137
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000007639 printing Methods 0.000 title claims abstract description 49
- 239000000463 material Substances 0.000 title claims abstract description 35
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 60
- 229920002472 Starch Polymers 0.000 claims abstract description 48
- 235000019698 starch Nutrition 0.000 claims abstract description 48
- 239000008107 starch Substances 0.000 claims abstract description 47
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 41
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 41
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 30
- 239000000839 emulsion Substances 0.000 claims abstract description 27
- 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 claims abstract description 26
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 26
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 25
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 25
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 25
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000000314 lubricant Substances 0.000 claims abstract description 19
- 239000005871 repellent Substances 0.000 claims abstract description 19
- 230000002940 repellent Effects 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 125000002091 cationic group Chemical group 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 45
- 239000007787 solid Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 9
- 238000006467 substitution reaction Methods 0.000 claims description 4
- 239000003002 pH adjusting agent Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- 239000002904 solvent Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000853 adhesive Substances 0.000 abstract description 8
- 230000001070 adhesive effect Effects 0.000 abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000049 pigment Substances 0.000 abstract description 5
- 239000012466 permeate Substances 0.000 abstract description 2
- 239000000976 ink Substances 0.000 description 42
- 239000000243 solution Substances 0.000 description 29
- 238000003756 stirring Methods 0.000 description 24
- 238000002156 mixing Methods 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 12
- 239000011259 mixed solution Substances 0.000 description 12
- 239000004816 latex Substances 0.000 description 6
- 229920000126 latex Polymers 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000010025 steaming Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000007645 offset printing Methods 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 3
- 239000011115 styrene butadiene Substances 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 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 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
Abstract
The application provides special light-weight coated paper for water-based ink digital printing, and a coating material and application thereof, wherein the coating material comprises the following components: 80-90 parts of heavy calcium carbonate; 10-20 parts of calcined kaolin with a pore structure; 1-5 parts of polyvinyl acetate emulsion; 10-15 parts of cationic coating starch; 0.1-0.5 parts of sodium carboxymethylcellulose; 0.05-0.15 part of dispersant; 0.02-0.05 part of pH regulator; 0.5-1.0 part of lubricant and water repellent agent respectively. In the coating material formula, porous calcined kaolin and heavy calcium carbonate are used as pigments, and hydrophilic polyvinyl acetate emulsion and coating starch are mainly used as adhesives. When the ink is coated on paper, the light-weight coated paper has a good absorption effect on the water-based ink, water can quickly permeate into the coating, and the water-based ink using water and alcohol as solvents can meet the quality requirement of digital printing.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to light-weight coated paper special for water-based ink digital printing, and a coating material and application thereof.
Background
Lightweight coated papers are commonly used in high speed web offset printing of books and magazines and typically use oil based inks. The solvent used in the oil-based ink is an organic solvent, and the organic solvent is easily volatilized in the drying process. In order to protect the environment and reduce the harm to human body, the printing industry has been slow to use water-based ink instead of part of oil-based ink. In recent years, digital printing has rapidly developed by virtue of the advantages of variable data printing, personalized printing, networked printing and the like, has become an important development direction of the digital era of the printing industry, and has wide market prospect and development space. The special ink adopted by the digital ink-jet printing is anionic water-based ink, the used solvent is not an organic solvent, but water and alcohol are blended according to a certain proportion, and the compatibility of the water, the alcohol and the ink in the water-based ink is different from that of the oil-based ink.
The production process flow of the conventional lightweight coated paper comprises the following steps: pulping, batching, screening, squeezing, pre-drying, making raw paper, coating the raw paper with paint, post-drying, press polishing and reeling to obtain the light-weight coated paper. The coating for coating the light-weight coated paper generally adopts heavy calcium carbonate and kaolin as pigments, styrene-butadiene latex and coating starch as adhesives, and components such as a lubricant and a water repellent agent are added to improve the performance of the coating. The conventional light-weight coated paper is suitable for oil-based ink offset printing, has good printing adaptability, cannot meet the requirement of water-based ink digital printing, and has poor printing effect.
Disclosure of Invention
In view of the above, the invention aims to provide light-weight coated paper special for water-based ink digital printing, a coating material and application thereof.
The technical scheme adopted by the invention is to provide a coating material for light-weight coated paper, which comprises the following components in parts by weight:
80-90 parts of heavy calcium carbonate;
10-20 parts of calcined kaolin;
1-5 parts of polyvinyl acetate emulsion;
10-15 parts of coating starch;
0.1-0.5 parts of sodium carboxymethylcellulose;
0.05-0.15 part of dispersant;
0.02-0.05 part of pH regulator;
0.5-1.0 part of lubricant;
0.5-1.0 part of water repellent agent;
the calcined kaolin has a pore structure and the coating starch is a cationic starch.
Preferably, the calcined kaolin has a density of from 2.5 to 2.6g/cm 3 Average particle size of 1.0-1.2 μm; preferably, the whiteness is 91.0-92.0% ISO and the pH value is 6.0-8.0.
Preferably, the cationic degree of substitution of the coating starch is from 0.035 to 0.075.
Preferably, the polyvinyl acetate emulsion has a solid content of 48.0-50.0 wt%, a pH value of 6.0-8.0, and a room-temperature viscosity of 300-500 mPas.
Preferably, the pH adjuster is sodium hydroxide.
Preferably, the solids content of the coating charge is from 60.0 to 64.0% by weight.
Preferably, the pH of the coating material is 8.0 to 9.0.
The invention provides special light-weight coated paper for water-based ink digital printing, which comprises base paper and a coating formed by coating a layer of coating on the surface of the base paper, wherein the coating used for the coating is the coating material.
Preferably, the preparation process of the coating used for the coating comprises the following steps:
s1, mixing the calcined kaolin, the pH regulator, the dispersant and water, and uniformly stirring to obtain a calcined kaolin mixed solution;
mixing the coating starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain coating starch solution;
mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain sodium carboxymethylcellulose solution;
and S2, sequentially adding heavy calcium carbonate, polyvinyl acetate emulsion, the coating starch solution, sodium carboxymethyl cellulose solution, a lubricant and a water repellent agent into the calcined kaolin mixed solution, uniformly stirring, and adjusting the pH to 8.0-9.0 to obtain the coating material.
In the process of preparing the coating, the control of the pH value is particularly important, and if the pH value is lower than 8.0, the viscosity of the coating can be increased, so that the coating operation performance is influenced; if the pH is higher than 9.0, the stability of the coating material is deteriorated.
The invention also provides the use of the lightweight coated paper as described above in aqueous ink digital printing.
The water-based ink for digital printing has a slower solvent penetration rate into the coating than the oil-based solvent, and water is more difficult to evaporate than the organic solvent during drying. How to control the absorption and drying speed of the light-weight coated paper on the water-based ink for digital printing is a technical problem.
The coating used for coating the base paper in the embodiment of the invention comprises the following components in parts by weight: 80-90 parts of heavy calcium carbonate, 10-20 parts of calcined kaolin, 1-5 parts of polyvinyl acetate emulsion, 10-15 parts of coating starch, 0.05-0.15 part of dispersant, 0.02-0.05 part of pH regulator, 0.1-0.5 part of sodium carboxymethylcellulose, 0.5-1.0 part of lubricant and 0.5-1.0 part of water repellent agent. Water in the solvent of the water-based ink is slowly volatilized, so that when the ink is coated on paper, water needs to quickly penetrate into the coating, the ink can be completely attached to the coating, and the coating is ensured to have no water marks. In the formula of the coating material, the porous calcined kaolin and the heavy calcium carbonate are used as pigments of the coating, and the hydrophilic polyvinyl acetate emulsion and the coating starch are mainly used as adhesives of the coating, so that the structure of a paper coating becomes more loose, and the coating material has better affinity effect on solvents containing water and alcohol in ink. When the ink is coated on paper, the light-weight coated paper has a good absorption effect on the water-based ink, water can quickly permeate into the coating, and the water-based ink using water and alcohol as solvents can meet the quality requirement of digital printing.
In addition, the invention adopts a large amount of bio-based starch adhesive, reduces the consumption of synthetic latex and reduces the pollution to the environment.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a coating material of light-weight coated paper, which comprises the following components in parts by weight:
80-90 parts of heavy calcium carbonate; 10-20 parts of calcined kaolin; 1-5 parts of polyvinyl acetate emulsion; 10-15 parts of coating starch; 0.1-0.5 parts of sodium carboxymethylcellulose; 0.05-0.15 part of dispersant; 0.02-0.05 part of pH regulator; 0.5-1.0 part of lubricant; 0.5-1.0 part of water repellent agent; the calcined kaolin has a pore structure and the coating starch is a cationic starch.
The light-weight coated paper provided by the invention has a good absorption effect on water-based ink, is good in printability and meets the requirement of digital printing.
In the coating material provided by the invention, calcined kaolin and heavy calcium carbonate are used as pigments, and the coating material specifically comprises 80-90 parts of heavy calcium carbonate and 10-20 parts of calcined kaolin. Ground calcium carbonate, also called Ground Calcium Carbonate (GCC), is generally prepared by directly crushing natural calcite, limestone, shells and the like by a mechanical method, and the sedimentation volume is 1.1-1.9 mL/g. The heavy calcium carbonate has larger particle size difference, wider particle size distribution and larger particle size, and the average particle size is generally 1-10 mu m; the average particle size (d) is: coarse ground calcium carbonate (larger than 3 μm), fine ground calcium carbonate (1-3 μm), and ultrafine calcium carbonate (0.5-1 μm). In some embodiments of the invention, the heavy calcium carbonate used is self-made C95 coated heavy calcium carbonate with a mass content of about 94-96% at about 2 μm.
The calcined kaolin is prepared by sintering kaolin (inorganic nonmetal mixture powder) in a calcining furnace to a certain temperature; the calcined kaolin in the invention not only retains the sheet-like characteristic of kaolin, but also forms porosity inside particles due to calcination and dehydration, has a good pore structure, and can obviously improve the absorption performance of the water-based ink. In a specific embodiment of the invention, the calcined kaolin has a density of from 2.5 to 2.6g/cm 3 Average particle size of 1.0-1.2 μm; further, the calcined kaolin requires: the whiteness is 91.0-92.0% ISO, the pH value is 6.0-8.0, and the product is commercially available.
In addition, the polyvinyl acetate emulsion and the coating starch are used as the adhesive of the coating, so that the coating structure is looser, and the coating has better affinity effect on water-containing and alcohol-containing solvents in the ink. The coating formula comprises, by weight, 1-5 parts of polyvinyl acetate emulsion and 10-15 parts of coating starch. The polyvinyl acetate (PVAc for short) emulsion is preferably 2-5 parts, is milky viscous liquid prepared by emulsion polymerization of vinyl acetate monomers under the action of materials such as an initiator and the like, and belongs to a water-based product; the acetyl group (CH3-CO-) of the polyvinyl acetate emulsion can significantly improve the absorption performance of the water-based ink.
The embodiment of the invention adopts a commercial polyvinyl acetate emulsion product; preferably, the polyvinyl acetate emulsion has a solids content of 48.0 to 50.0 wt.%, a pH of 6.0 to 8.0 and a viscosity of 300-500 mPas (25 ℃).
In the invention, the coating starch is cationic starch, the cationic substitution degree of the coating starch is preferably 0.035-0.075, and the color fixing effect of the water-based ink can be improved. Cationic starch generally refers to a product prepared by reacting starch with a cationic reagent (often called an etherifying agent) under certain conditions, wherein the cationic reagent mainly comprises a tertiary amine salt cationic reagent and a quaternary ammonium salt cationic reagent, and the cationic property is endowed to the starch; embodiments of the present invention may employ commercially available or self-prepared cationic coated starches in amounts of, for example, 10 parts, 12 parts, 13 parts. The embodiment of the invention adopts a large amount of bio-based starch adhesive, reduces the consumption of synthetic latex and is beneficial to environmental protection.
The coating material of the embodiment of the invention comprises: 0.1-0.5 parts by weight of sodium carboxymethylcellulose; the sodium carboxymethylcellulose is also called sodium carboxymethylcellulose salt, carboxymethylcellulose and CMC-Na, is a cellulose derivative with the glucose polymerization degree of 100-2000, and mainly plays roles in thickening, bonding and the like.
The coating formula of the embodiment of the invention comprises the following additives in parts by weight: 0.05-0.15 part of dispersant; 0.02-0.05 part of pH regulator; 0.5-1.0 part of lubricant; 0.5 to 1.0 portion of water repellent agent.
In the embodiment of the invention, the dispersing agent includes, but is not limited to, sodium polyacrylate, sodium hexametaphosphate and the like, preferably sodium polyacrylate, the solid content is more than or equal to 40%, the viscosity is less than or equal to 250mPa.s, and the pH value is 7.0-8.0. The pH adjusting agent is preferably sodium hydroxide, which also promotes dispersion. The lubricant can be one or more selected from zinc stearate, calcium stearate and polyethylene wax emulsion, preferably polyethylene wax emulsion, the solid content is 48-52%, the viscosity is less than or equal to 200mPa.s, and the pH value is 9.0-12.5. The water repellent agent (also called as a waterproof agent) is preferably polyamide polyurea resin, the solid content is 48-52%, the viscosity is less than or equal to 200mPa.s, and the pH value is 7.0-9.0. The viscosity is a value at room temperature of 25 ℃, and the solid content is mass content.
The coating material provided by the embodiment of the invention is prepared from the pigment, the adhesive, the additive and water; the solid content of the coating material is preferably 60.0-64.0 wt%, and the coating material can be suitable for high-speed paper machines. And the pH value of the coating material is 8.0-9.0, and the coating material has the characteristics of good stability and the like.
In a preferred embodiment of the present invention, the preparation method of the coating material comprises the following steps:
s1, mixing the calcined kaolin, the pH regulator, the dispersant and water, and uniformly stirring to obtain a calcined kaolin mixed solution; mixing the coating starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain coating starch solution; mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain sodium carboxymethylcellulose solution;
and S2, sequentially adding heavy calcium carbonate, polyvinyl acetate emulsion, the coating starch solution, sodium carboxymethyl cellulose solution, a lubricant and a water repellent agent into the calcined kaolin mixed solution, uniformly stirring, and adjusting the pH to 8.0-9.0 to obtain the coating material.
In the process of preparing the coating, the pH value is preferably controlled to be 8.0-9.0; if the pH value is lower than 8.0, the viscosity of the coating material is increased, and the coating operation performance is influenced; if the pH is higher than 9.0, the stability of the coating material is deteriorated.
The invention provides special light-weight coated paper for water-based ink digital printing, which comprises base paper and a coating formed by coating a layer of coating on the surface of the base paper, wherein the base paper is a conventional paper raw material in the field; the coating material used for the coating layer is the coating material described above. Coating the paper base with the coating to obtain light-weight coated paper with the quantitative of 50-90 g/m 2 。
The light-weight coated paper has a water content of 5.5 to 7.0 wt%, a whiteness (ISO) of 75 to 90%, and is opaqueThe degree is more than 82 percent, and the surface absorption weight is less than 25g/m 2 Longitudinal fracture length is larger than 4500m, transverse folding resistance is larger than 12 times, smoothness is larger than 500s, transverse expansion rate is smaller than 3. O%, printing surface strength is larger than 1.0m/s, glossiness is larger than 35%, and printing optical density is larger than 1.0; the paper is smooth and flat. The method is used for digital printing, the printing color is full and bright, the image mesh points are clear, and the edge is free of burrs.
The invention also provides application of the light-weight coated paper in water-based ink digital printing. The light-weight coated paper has a good absorption effect on water-based ink, is good in printability and meets the requirement of digital printing.
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention. Wherein, the weight ratio is not specially stated. In the examples of the present invention, commercially available raw materials were used. The polyvinyl acetate emulsion used, type: 2160HT, available from DOW chemical company; calcined kaolin, type: HA-90, available from Shanxi Jinyang corporation; the used coating starch is self-made cationic starch, and the substitution degree of the cation is 0.035-0.075; the heavy calcium carbonate is self-made C95 coated heavy calcium carbonate, and the content of-2 um is 94-96%; in the embodiment, the dispersing agent is sodium polyacrylate, the solid content is more than or equal to 40 percent, the viscosity is less than or equal to 250mPa.s, and the pH value is 7.0-8.0; the lubricant is polyethylene wax emulsion with solid content of 48-52%, viscosity of less than or equal to 200mPa.s and pH value of 9.0-12.5; the water repellent agent is polyamide polyurea resin, the solid content is 48-52%, the viscosity is less than or equal to 200mPa.s, and the pH value is 7.0-9.0.
Example 1
A special light-weight coated paper for water-based ink digital printing is disclosed, wherein a coating used for a coating comprises the following components in parts by weight: 90 parts of heavy calcium carbonate, 10 parts of calcined kaolin, 5 parts of polyvinyl acetate emulsion, 10 parts of coating starch, 0.05 part of dispersing agent, 0.02 part of sodium hydroxide, 0.4 part of sodium carboxymethylcellulose, 0.5 part of lubricating agent and 0.5 part of water repellent agent.
The preparation process of the coating used for the coating comprises the following steps:
1) mixing calcined kaolin, sodium hydroxide, a dispersant and water, and uniformly stirring to obtain a mixed solution;
2) mixing the coated starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain solution;
3) mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain solution;
4) adding heavy calcium carbonate, polyvinyl acetate emulsion, coating starch solution, sodium carboxymethyl cellulose solution, lubricant and water repellent agent into the calcined kaolin mixed solution in sequence, stirring uniformly, and adjusting the pH to 8.5 by using 10% sodium hydroxide solution to obtain the coating with the solid content of 62.6%.
After the paper base is coated with the coating, light-weight coated paper is obtained and is subjected to digital printing. The weight of the coated paper is 70g/m 2 Moisture content 6.0%, whiteness (ISO) 84%, opacity 86%, surface absorption weight 23g/m 2 Longitudinal fracture length 5200m, transverse folding resistance 18 times, smoothness 650s, transverse expansion rate 2.8%, printing surface strength 1.3m/s, glossiness 35%, and printing optical density 1.0; the paper is flat and smooth, the printing color is full and bright, the image mesh points are clear, and the edge is free of burrs.
Example 2
A special light-weight coated paper for water-based ink digital printing is disclosed, wherein a coating used for a coating comprises the following components in parts by weight: 85 parts of heavy calcium carbonate, 15 parts of calcined kaolin, 3 parts of polyvinyl acetate emulsion, 12 parts of coating starch, 0.05 part of dispersant, 0.02 part of sodium hydroxide, 0.3 part of sodium carboxymethylcellulose, 0.6 part of lubricant and 0.6 part of water repellent agent.
The preparation process of the coating used for the coating comprises the following steps:
1) mixing calcined kaolin, sodium hydroxide, a dispersant and water, and uniformly stirring to obtain a mixed solution;
2) mixing the coated starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain solution;
3) mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain solution;
4) adding heavy calcium carbonate, polyvinyl acetate emulsion, coating starch solution, sodium carboxymethyl cellulose solution, lubricant and water repellent agent into the calcined kaolin mixed solution in sequence, stirring uniformly, and adjusting the pH to 8.5 by using 10% sodium hydroxide solution to obtain the coating with the solid content of 61.5%.
After the paper base is coated with the coating, light-weight coated paper is obtained and is subjected to digital printing. The weight of the coated paper is 60g/m 2 Moisture content 6.5%, whiteness (ISO) 82%, opacity 85%, surface absorption weight 22g/m 2 Longitudinal fracture length is 5000m, transverse folding resistance is 16 times, smoothness is 700s, transverse expansion rate is less than 2.6%, printing surface strength is 1.2m/s, glossiness is 36%, and printing optical density is 1.1; the paper is flat and smooth, the printing color is full and bright, the image mesh points are clear, and the edge is free of burrs.
Example 3
A special light-weight coated paper for water-based ink digital printing is disclosed, wherein a coating used for a coating comprises the following components in parts by weight: 80 parts of heavy calcium carbonate, 20 parts of calcined kaolin, 2 parts of polyvinyl acetate emulsion, 13 parts of coating starch, 0.05 part of dispersant, 0.02 part of sodium hydroxide, 0.2 part of sodium carboxymethylcellulose, 0.5 part of lubricant and 0.5 part of water repellent agent.
The preparation process of the coating used for the coating comprises the following steps:
1) mixing calcined kaolin, sodium hydroxide, a dispersant and water, and uniformly stirring to obtain a mixed solution;
2) mixing the coated starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain solution;
3) mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain solution;
4) adding heavy calcium carbonate, polyvinyl acetate emulsion, coating starch solution, sodium carboxymethyl cellulose solution, lubricant and water repellent agent into the calcined kaolin mixed solution in sequence, stirring uniformly, and adjusting the pH to 8.5 by using 10% sodium hydroxide solution to obtain the coating with the solid content of 60.4%.
After the paper base is coated with the coating, light-weight coated paper is obtained and is subjected to digital printing. The weight of the coated paper is 80g/m 2 The water content is 7.0 percentWhiteness (ISO) 85%, opacity 87%, surface absorption weight 21g/m 2 The longitudinal fracture length is 5500m, the transverse folding resistance is 18 times, the smoothness is 600s, the transverse expansion rate is 2.5%, the printing surface strength is 1.2m/s, the glossiness is 38%, and the printing optical density is 1.2; the paper is flat and smooth, the printing color is full and bright, the image mesh points are clear, and the edge is free of burrs.
Comparative example 1
A lightweight coated paper, typically for high speed web offset printing, is coated with a coating comprising the following components in parts by weight: 70 parts of heavy calcium carbonate, 30 parts of kaolin, 10 parts of styrene-butadiene latex, 3 parts of coating starch, 0.03 part of dispersant, 0.02 part of sodium hydroxide, 0.1 part of sodium carboxymethylcellulose, 0.5 part of lubricant and 0.5 part of water repellent agent.
The preparation process of the coating used for the coating comprises the following steps:
1) mixing kaolin, sodium hydroxide, a dispersant and water, and uniformly stirring to obtain a mixed solution;
2) mixing the coated starch with water, heating to 90-100 deg.C, steaming, and stirring to obtain solution;
3) mixing sodium carboxymethylcellulose with water, heating to 50-60 deg.C for dissolving, and stirring to obtain solution;
4) adding heavy calcium carbonate, styrene-butadiene latex, coating starch solution, sodium carboxymethylcellulose solution, lubricant and water repellent agent into the kaolin mixed solution in sequence, stirring uniformly, and adjusting the pH to 8.0 by using 10% sodium hydroxide solution to obtain the coating with the solid content of 65%.
After the paper base is coated with the coating, lightweight coated paper is obtained and printed. The weight of the lightweight coated paper is 70g/m 2 Moisture content 6.0%, whiteness (ISO) 84%, opacity 84%, surface absorption weight 35g/m 2 Longitudinal fracture length is 5000m, transverse folding resistance is 16 times, smoothness is 950s, transverse expansion rate is 3.2%, printing surface strength is 1.5m/s, glossiness is 45%, and printing optical density is 0.8; the paper is smooth and flat, and is used for offset printing with full and bright color and clear image dots; when the ink is used for digital printing of water-based ink, burrs are formed on the edges of the pictures and the texts, and the ink diffusion phenomenon exists.
From the above examples, it is clear that the lightweight coated paper with the coating material formulation of the present invention has a good absorption effect on water-based ink when ink is applied to paper, and water can quickly penetrate into the coating layer, and the quality requirements for digital printing can be satisfied by using water-based ink containing water and alcohol as solvents. In addition, the invention adopts a large amount of bio-based starch adhesive, reduces the consumption of synthetic latex and reduces the pollution to the environment.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The coating material for the lightweight coated paper is characterized by comprising the following components in parts by weight:
80-90 parts of heavy calcium carbonate;
10-20 parts of calcined kaolin;
1-5 parts of polyvinyl acetate emulsion;
10-15 parts of coating starch;
0.1-0.5 parts of sodium carboxymethylcellulose;
0.05-0.15 part of dispersant;
0.02-0.05 part of pH regulator;
0.5-1.0 part of lubricant;
0.5-1.0 part of water repellent agent;
the calcined kaolin has a pore structure and the coating starch is a cationic starch.
2. A coating charge for lightweight coated paper according to claim 1, wherein the calcined kaolin has a density of from 2.5 to 2.6g/cm 3 And the average particle diameter is 1.0-1.2 μm.
3. A coating charge for lightweight coated paper according to claim 2, wherein the calcined kaolin has a whiteness in the range of 91.0 to 92.0% ISO and a pH in the range of 6.0 to 8.0.
4. A coating charge for light weight coated paper according to claim 1, characterized in that the cationic degree of substitution of the coating starch is 0.035-0.075.
5. The material for coating a lightweight coated paper as set forth in claim 1, wherein the polyvinyl acetate emulsion has a solid content of 48.0 to 50.0 wt%, a pH of 6.0 to 8.0, and a viscosity of 300-500 mPas at 25 ℃.
6. A coating material for lightweight coated paper according to claim 1, wherein the pH adjuster is sodium hydroxide.
7. A coating slip for light weight coated paper according to any of claims 1-6, characterized in that the coating slip has a solids content of 60.0-64.0 wt.%.
8. A coating slip for lightweight coated paper according to any of claims 1-6, wherein the pH of the coating slip is 8.0-9.0.
9. A special light-weight coated paper for water-based ink digital printing comprises base paper and a coating formed by coating a layer of coating on the surface of the base paper, and is characterized in that the coating used for the coating is the coating material in any one of claims 1 to 8.
10. Use of the lightweight coated paper according to claim 9 in aqueous ink digital printing.
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