CN114457616A - Ink-absorbing aqueous coating liquid suitable for pearlescent paper and preparation method thereof - Google Patents
Ink-absorbing aqueous coating liquid suitable for pearlescent paper and preparation method thereof Download PDFInfo
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- CN114457616A CN114457616A CN202110281421.6A CN202110281421A CN114457616A CN 114457616 A CN114457616 A CN 114457616A CN 202110281421 A CN202110281421 A CN 202110281421A CN 114457616 A CN114457616 A CN 114457616A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 62
- 238000000576 coating method Methods 0.000 title claims abstract description 62
- 239000007788 liquid Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 29
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000002270 dispersing agent Substances 0.000 claims abstract description 20
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 20
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 31
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 17
- 229920002678 cellulose Polymers 0.000 claims description 16
- 239000001913 cellulose Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 7
- 239000005056 polyisocyanate Substances 0.000 claims description 7
- 229920001228 polyisocyanate Polymers 0.000 claims description 7
- 229920005862 polyol Polymers 0.000 claims description 7
- 150000003077 polyols Chemical class 0.000 claims description 7
- 229920002873 Polyethylenimine Polymers 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 4
- 230000001580 bacterial effect Effects 0.000 claims description 4
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 claims description 4
- 239000002159 nanocrystal Substances 0.000 claims description 4
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 abstract description 8
- 230000001070 adhesive effect Effects 0.000 abstract description 8
- 235000000177 Indigofera tinctoria Nutrition 0.000 abstract description 7
- 229940097275 indigo Drugs 0.000 abstract description 7
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 6
- 230000003993 interaction Effects 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000008234 soft water Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- -1 polyvinylamine Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
-
- 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 invention provides an ink-absorbing water-based coating liquid suitable for iridescent paper, which is prepared from the following raw materials: 18-35 parts by weight of an ethylene-acrylic acid copolymer; 15-30 parts by weight of polyurethane resin; 2-5 parts by weight of fumed silica; 0.01-0.06 parts by weight of nanocellulose; 3-6 parts of a dispersant; 0.5-1.5 parts by weight of a color fixing agent; 60-85 parts of water. Compared with the prior art, the ink-absorbing water-based coating liquid suitable for the pearlescent paper provided by the invention adopts specific content components, so that the overall better interaction is realized, and the product is used for coating treatment of the pearlescent paper, so that the problems of poor inking and poor adhesion of the pearlescent paper during printing of HP ElectroInk electronic ink can be solved. Experimental results show that the solid content of the ink-absorbing water-based coating liquid provided by the invention is 10-20%, and the viscosity is 32-50 mPa & s; a sample obtained by coating the pearlescent paper and printing the pearlescent paper by HP Indigo has uniform and saturated printed appearance color, the color difference value is 0.4-0.8, and the adhesive force is good and reaches 0-1 grade of the standard GB/T5210-1985.
Description
Technical Field
The invention relates to the technical field of printing, in particular to an ink-absorbing water-based coating liquid suitable for pearlescent paper and a preparation method thereof.
Background
The pearly-lustre synthetic paper is a synthetic paper with pearly-lustre effect, is made of olefin raw materials and additives, has the effects of soft texture, strong tensile strength, light resistance and corrosion resistance, and is widely used for printing high-grade artworks, maps, paintings and books, high-grade books and periodicals and the like.
With the rise of digital printing and the improvement of technology, digital printing has become a mainstream development technology, and especially has been more and more important in medium-high-end digital image products such as wedding, photography, personal portrait and the like. The pearlescent paper with the largest use amount in the market is structurally characterized in that a thin film layer, a pre-coating layer and a printing layer are sequentially arranged on base paper, the base paper is made of common materials, the thin film layer is PET, the pre-coating layer is a colored coating material and is used for adjusting the color of the surface of the pearlescent paper, and the printing layer is formed by a coating resin and pearlescent powder mixed material. The pearlescent paper can not be directly printed by HP ElectroInk electronic ink in the existing color digital printer, and the phenomena of poor printing ink adhesion, no adhesive force of an ink layer or low adhesive force and the like can occur.
Disclosure of Invention
In view of the above, the present invention provides an ink-absorbing aqueous coating solution suitable for pearlescent paper and a preparation method thereof, which can solve the problems of poor inking and poor adhesion of pearlescent paper when printing HP ElectroInk electronic ink.
The invention provides an ink-absorbing water-based coating liquid suitable for iridescent paper, which is prepared from the following raw materials:
18-35 parts by weight of an ethylene-acrylic acid copolymer;
15-30 parts by weight of polyurethane resin;
2-5 parts by weight of fumed silica;
0.01-0.06 parts by weight of nanocellulose;
3-6 parts of a dispersant;
0.5-1.5 parts by weight of a color fixing agent;
60-85 parts of water.
Preferably, the ethylene-acrylic acid copolymer is copolymerized by 45-85 wt% of ethylene and 55-15 wt% of acrylic acid.
Preferably, the polyurethane resin is prepared by reacting organic polyisocyanate and oligomeric polyol;
the organic polyisocyanate is selected from one or more of TDI, MDI and PAPI;
the oligomeric polyol is selected from one or more of polyethylene glycol with the molecular weight of 800-1000, ethylene glycol, hexanediol and glycerol.
Preferably, the particle size of the fumed silica is 20-60 nm, the purity is 99.5-100%, and the specific surface area is 200-600 m2/g。
Preferably, the nanocellulose is selected from one or more of cellulose nanofibres, cellulose nanocrystals and bacterial nanocelluloses.
Preferably, the dispersing agent is polyethylene glycol with the molecular weight of 1000-1500.
Preferably, the fixing agent is selected from one or more of polydiallyl dimethyl ammonium chloride, polyethyleneimine, polyvinylamine and chitosan.
The invention also provides a preparation method of the ink-absorbing water-based coating liquid suitable for the pearlescent paper, which comprises the following steps:
mixing ethylene-acrylic acid copolymer, polyurethane resin and water, sequentially adding fumed silica, nanocellulose and a dispersing agent, continuously stirring for 10-30 min, standing, and adding a color fixing agent under stirring to be uniform to obtain the ink-absorbing water-based coating liquid suitable for the pearlescent paper.
Preferably, the mixing mode is stirring; the stirring speed is 50-150 r/min, and the stirring time is 3-8 min.
Preferably, the standing time is 20-30 h.
The invention provides an ink-absorbing aqueous coating liquid suitable for pearlescent paper, which is prepared from the following raw materials: 18-35 parts by weight of an ethylene-acrylic acid copolymer; 15-30 parts by weight of polyurethane resin; 2-5 parts by weight of fumed silica; 0.01-0.06 parts by weight of nanocellulose; 3-6 parts of a dispersant; 0.5-1.5 parts by weight of a color fixing agent; 60-85 parts of water. Compared with the prior art, the ink-absorbing water-based coating liquid suitable for the pearlescent paper provided by the invention adopts specific content components, so that the overall better interaction is realized, and the product is used for coating treatment of the pearlescent paper, so that the problems of poor inking and poor adhesion of the pearlescent paper during printing of HP ElectroInk electronic ink can be solved. Experimental results show that the solid content of the ink-absorbing water-based coating liquid provided by the invention is 10-20%, and the viscosity is 32-50 mPa & s; a sample obtained by coating the pearlescent paper and printing the pearlescent paper by HP Indigo has uniform and saturated printed appearance color, the color difference value is 0.4-0.8, and the adhesive force is good and reaches 0-1 grade of the standard GB/T5210-1985.
In addition, the preparation method provided by the invention has the advantages of simple process, mild condition, easiness in control and wide application prospect.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The invention provides an ink-absorbing aqueous coating liquid suitable for pearlescent paper, which is prepared from the following raw materials:
18-35 parts by weight of an ethylene-acrylic acid copolymer;
15-30 parts by weight of polyurethane resin;
2-5 parts by weight of fumed silica;
0.01-0.06 parts by weight of nanocellulose;
3-6 parts of a dispersant;
0.5-1.5 parts by weight of a color fixing agent;
60-85 parts of water.
In the present invention, the ink-receptive aqueous coating liquid suitable for the pearlescent paper comprises ethylene-acrylic acid copolymer, polyurethane resin, fumed silica, nanocellulose, a dispersant, a fixing agent and water, and preferably consists of ethylene-acrylic acid copolymer, polyurethane resin, fumed silica, nanocellulose, a dispersant, a fixing agent and water.
In the present invention, the ethylene-acrylic acid copolymer is preferably copolymerized from 45 to 85 wt% of ethylene and 55 to 15 wt% of acrylic acid, and more preferably copolymerized from 50 to 70 wt% of ethylene and 50 to 30 wt% of acrylic acid. The sources of the ethylene and acrylic acid are not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the copolymerization is preferably performed in a high pressure reactor, specifically a resin obtained by copolymerizing a vinyl monomer and an acrylic monomer by a radical polymerization reaction. In the present invention, the ink-receptive aqueous coating liquid suitable for the pearlescent paper comprises 18 to 35 parts by weight of an ethylene-acrylic acid copolymer, preferably 20 parts by weight.
In the present invention, the polyurethane resin is preferably prepared by reacting an organic polyisocyanate and an oligomeric polyol; the reaction is specifically a polymerization reaction, and the present invention is not particularly limited thereto. In the present invention, the organic polyisocyanate is preferably selected from one or more of TDI, MDI and PAPI, more preferably TDI and MDI. The source of the organic polyisocyanate in the present invention is not particularly limited, and commercially available products of the above-mentioned TDI, MDI and PAPI known to those skilled in the art may be used. In the invention, the oligomeric polyol is preferably one or more selected from polyethylene glycol with molecular weight of 800-1000, ethylene glycol, hexanediol and glycerol, and is more preferably ethylene glycol. The sources of the oligomeric polyols are not particularly limited, and those commercially available from polyethylene glycol, ethylene glycol, hexanediol, and glycerin having a molecular weight of 800 to 1000, which are well known to those skilled in the art, may be used. In the invention, the ink-absorbing aqueous coating liquid suitable for the pearlescent paper comprises 15-30 parts by weight of polyurethane resin, preferably 25 parts by weight.
In the invention, the fumed silica refers to silica which is decomposed in oxyhydrogen gas flow to obtain silica with extremely high specific surface area and fluffy feeling; the fumed silica has the advantages of small particle size, high purity, good dispersibility and the like, and meanwhile, the fumed silica is arranged on the surface of paperThe surface can form a micropore structure, can inhibit the migration of ink to X and Y directions, and can also play the roles of fixing the ink and quickly drying. In the invention, the particle size of the fumed silica is preferably 20-60 nm, and more preferably 30-50 nm; the purity of the fumed silica is preferably 99.5-100%, and more preferably 99.6-99.9%; the specific surface area of the fumed silica is preferably 200-600 m2A concentration of 300 to 500m is more preferable2(ii) in terms of/g. In the invention, the ink-absorbing water-based coating liquid suitable for the pearlescent paper comprises 2-5 parts by weight of fumed silica, and preferably 4 parts by weight.
In the present invention, the nanocellulose is preferably selected from one or more of Cellulose Nanofibres (CNF), Cellulose Nanocrystals (CNC) and Bacterial Nanocelluloses (BNC), more preferably cellulose nanofibres. The source of the nanocellulose is not particularly limited in the present invention, and commercially available products of the above Cellulose Nanofibers (CNF), Cellulose Nanocrystals (CNC) and Bacterial Nanocellulose (BNC) well known to those skilled in the art may be used. In the invention, the nano-cellulose can react with fumed silica to reduce the particle size of fumed silica particles and reduce the porosity, so that the particle size of particles in a solution is reduced, the surface is smooth, the reflection of light is more, and the nano-cellulose has a small size effect, so that the glossiness of the printed pearlescent paper is increased under the combined action of the nano-cellulose and the fumed silica. In the invention, the ink-absorbing aqueous coating liquid suitable for the pearlescent paper comprises 0.01-0.06 part by weight of nano cellulose, and preferably 0.04 part by weight.
In the invention, the dispersant is preferably polyethylene glycol with the molecular weight of 1000-1500, and is more preferably polyethylene glycol with the molecular weight of 1100. In the invention, the polyethylene glycol can effectively prevent the particles from adsorbing each other by the hydrogen bond and affinity action, thereby achieving better dispersion effect. In the invention, the ink-absorbing aqueous coating liquid suitable for the pearlescent paper comprises 3-6 parts by weight of a dispersant, preferably 5 parts by weight.
In the present invention, the fixing agent is preferably selected from one or more of polydiallyldimethylammonium chloride, polyethyleneimine, polyvinylamine, and chitosan, more preferably polyethyleneimine. The source of the fixing agent is not particularly limited in the present invention, and commercially available products of the above-mentioned polydiallyldimethylammonium chloride, polyethyleneimine, polyvinylamine and chitosan, which are well known to those skilled in the art, may be used. In the invention, the cationic property of the fixing agent is beneficial to combining the anionic dye in the ink to the surface of the coating, the fixing agent improves the optical density of the coating while fixing the ink, and the color printing effect is excellent. In the invention, the ink-absorbing aqueous coating liquid suitable for the pearlescent paper comprises 0.5-1.5 parts by weight of a color fixing agent, preferably 1 part by weight.
The water used in the present invention is not particularly limited, and soft water known to those skilled in the art may be used. In the invention, the ink-absorbing aqueous coating liquid suitable for the pearlescent paper comprises 60-85 parts by weight of water, preferably 65 parts by weight.
The technical innovation point of the invention is that the nano-cellulose is applied to disperse fumed silica, so that the silica obtains good dispersion effect; because with the addition of nano-cellulose, the smaller the dispersed particle size of silicon dioxide in the solution, the smaller the particle size of silicon dioxide particles, the pores between fibers are filled with the silicon dioxide particles with small particle size, the roughness of the paper pattern is reduced, the leveling property of the aqueous coating liquid is utilized to uniformly fill the silicon dioxide particles in the larger pores on the surface of the paper, a large number of capillaries are formed, the arrangement of the aqueous coating liquid is compact, the surface is smooth, meanwhile, the printing ink can be fixed on the surface of the coating layer more, the ink absorption speed is accelerated, the color density value is improved, the color of the printed image is enabled to be fuller and more bright, and the color reducibility is better. On the basis, the ink-absorbing water-based coating liquid suitable for the pearlescent paper provided by the invention adopts specific content components, so that the overall good interaction is realized, and the product is used for coating treatment of the pearlescent paper, so that the problems of poor inking and poor adhesion of the pearlescent paper during printing of HP ElectroInk electronic ink can be solved.
The invention also provides a preparation method of the ink-absorbing water-based coating liquid suitable for the pearlescent paper, which comprises the following steps:
mixing ethylene-acrylic acid copolymer, polyurethane resin and water, sequentially adding fumed silica, nanocellulose and a dispersing agent, continuously stirring for 10-30 min, standing, and adding a color fixing agent under stirring to be uniform to obtain the ink-absorbing water-based coating liquid suitable for the pearlescent paper.
In the present invention, the ethylene-acrylic acid copolymer, the polyurethane resin, the water, the fumed silica, the nanocellulose, the dispersant and the fixing agent are the same as those in the above technical solution, and are not described herein again. In the present invention, the whole process of the preparation method is preferably performed at normal temperature, and the present invention is not particularly limited thereto.
In the present invention, the mixing is preferably performed by stirring; the rotating speed of the stirring is preferably 50-150 r/min, and more preferably 100 r/min; the stirring time is preferably 3-8 min, and more preferably 5 min.
In the invention, the continuous stirring is the same as the stirring speed in the mixing process; the continuous stirring time is 10-30 min, preferably 20 min.
In the invention, the standing time is preferably 20-30 h, and more preferably 24 h.
The preparation method provided by the invention has the advantages of simple process, mild condition, easiness in control and wide application prospect.
The invention provides an ink-absorbing aqueous coating liquid suitable for pearlescent paper, which is prepared from the following raw materials: 18-35 parts by weight of an ethylene-acrylic acid copolymer; 15-30 parts by weight of polyurethane resin; 2-5 parts by weight of fumed silica; 0.01-0.06 parts by weight of nanocellulose; 3-6 parts of a dispersant; 0.5-1.5 parts by weight of a color fixing agent; 60-85 parts of water. Compared with the prior art, the ink-absorbing water-based coating liquid suitable for the pearlescent paper provided by the invention adopts specific content components, so that the overall better interaction is realized, and the product is used for coating treatment of the pearlescent paper, so that the problems of poor inking and poor adhesion of the pearlescent paper during printing of HP ElectroInk electronic ink can be solved. Experimental results show that the solid content of the ink-absorbing water-based coating liquid provided by the invention is 10-20%, and the viscosity is 32-50 mPa & s; a sample obtained by coating the pearlescent paper and printing the pearlescent paper by HP Indigo has uniform and saturated printed appearance color, the color difference value is 0.4-0.8, and the adhesive force is good and reaches 0-1 grade of the standard GB/T5210-1985.
In addition, the preparation method provided by the invention has the advantages of simple process, mild condition, easiness in control and wide application prospect.
To further illustrate the present invention, the following examples are provided for illustration. The ethylene-acrylic acid copolymers used in the following examples of the present invention were all copolymerized from 67.6 wt% ethylene and 32.4 wt% acrylic acid, and the synthetic steps were: sequentially adding ethylene and acrylic acid with corresponding mass into a high-pressure reaction kettle, stirring at 45 ℃ for 2 hours, and then cooling to normal temperature to obtain the copolymer; the polyurethane resin is obtained by polymerizing TDI, MDI and glycol; the fumed silica has particle size of 40nm, purity of 99.8%, and specific surface area of 400m2(ii)/g; the nanocellulose is Cellulose Nanofiber (CNF) with ash content of less than 0.06% and more than 98%, preferably with nanocellulose content of 99.2% and ash content of 0.042%, and viscosity average molecular weight (M) measured by viscosity methodηIs 10 x 104) (ii) a The used dispersing agents are all polyethylene glycol with the molecular weight of 1100; the color fixing agent is polyethyleneimine; the HP Indigo printing is printed by an HP 5000 model of Hongkong Limited, Kaiko, Haikou, and the printed appearance color value is detected by a portable color difference meter.
Example 1
Mixing 18 parts by weight of ethylene-acrylic acid copolymer, 15 parts by weight of polyurethane resin and 60 parts by weight of soft water, starting stirring, stirring for 5min at the speed of 100r/min, sequentially adding 2 parts by weight of fumed silica, 0.01 part by weight of nano-cellulose and 3 parts by weight of dispersing agent at normal temperature, continuously stirring for 20min, standing for 24h, and adding 0.5 part by weight of color fixing agent under stirring until the mixture is uniform to obtain the ink-absorbing water-based coating liquid.
As a result of the examination, the solid content of the ink-receptive aqueous coating liquid provided in example 1 of the present invention was 10%, and the viscosity was 32 mPas; coating on the pearlescent paper by a 120-mesh wire roller, wherein the dry weight of the coating is 1g/m2After HP Indigo printingAnd obtaining a sample, and detecting the uniform color of the printed appearance by using a portable color difference meter, wherein the color difference value tested by the color difference meter is 0.8, and the adhesive force reaches 1 grade of the standard GB/T5210-1985.
Example 2
Mixing 20 parts by weight of ethylene-acrylic acid copolymer, 25 parts by weight of polyurethane resin and 65 parts by weight of soft water, starting stirring, stirring for 5min at the speed of 100r/min, sequentially adding 4 parts by weight of fumed silica, 0.04 part by weight of nano cellulose and 5 parts by weight of dispersing agent at normal temperature, continuously stirring for 20min, standing for 24h, and adding 1 part by weight of color fixing agent under stirring until the mixture is uniform to obtain the ink-absorbing water-based coating liquid.
The solid content of the ink-absorbing aqueous coating liquid provided in example 2 of the present invention was found to be 20%, and the viscosity was found to be 38mPa · s; coating on the pearlescent paper by a 120-mesh wire roller, wherein the dry weight of the coating is 2g/m2And obtaining a sample after HP Indigo printing, and detecting that the color of the printed appearance is uniform by using a portable color difference meter, wherein the color difference value tested by the color difference meter is 0.4, and the adhesive force reaches 0 grade of the standard GB/T5210-1985.
Example 3
Mixing 35 parts by weight of ethylene-acrylic acid copolymer, 30 parts by weight of polyurethane resin and 85 parts by weight of soft water, starting stirring, stirring for 5min at the speed of 100r/min, sequentially adding 5 parts by weight of fumed silica, 0.06 part by weight of nanocellulose and 6 parts by weight of dispersing agent at normal temperature, continuously stirring for 20min, standing for 24h, and adding 1.5 parts by weight of color fixing agent under stirring until the mixture is uniform to obtain the ink-absorbing water-based coating liquid.
As a result of the examination, the solid content of the ink-receptive aqueous coating liquid provided in example 3 of the present invention was 17%, and the viscosity was 41 mPas; coating on the pearlescent paper by a 120-mesh wire roller, wherein the dry weight of the coating is 1.7g/m2And obtaining a sample after HP Indigo printing, detecting that the color of the printed appearance is uniform by using a portable color difference meter, wherein the color difference value measured by the color difference meter is 0.5, and the adhesive force reaches grade 1 of the standard GB/T5210-1985.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An ink-absorbing aqueous coating liquid suitable for pearlescent paper is prepared from the following raw materials:
18-35 parts by weight of an ethylene-acrylic acid copolymer;
15-30 parts by weight of polyurethane resin;
2-5 parts by weight of fumed silica;
0.01-0.06 parts by weight of nanocellulose;
3-6 parts of a dispersant;
0.5-1.5 parts by weight of a color fixing agent;
60-85 parts of water.
2. An ink-receptive aqueous coating solution suitable for pearlescent paper according to claim 1 characterized in that the ethylene-acrylic acid copolymer is copolymerized from 45 to 85 wt% of ethylene and 55 to 15 wt% of acrylic acid.
3. An ink-receptive aqueous coating solution suitable for pearlescent paper in accordance with claim 1 wherein the polyurethane resin is prepared by reacting an organic polyisocyanate and an oligomeric polyol;
the organic polyisocyanate is selected from one or more of TDI, MDI and PAPI;
the oligomeric polyol is selected from one or more of polyethylene glycol with the molecular weight of 800-1000, ethylene glycol, hexanediol and glycerol.
4. An ink-receptive aqueous coating liquid for pearlescent paper according to claim 1, wherein the fumed silica has a particle diameter of 20 to 60nm, a purity of 99.5 to 100%, and a specific surface area of 200 to 600m2/g。
5. An ink-receptive aqueous coating solution suitable for pearlescent paper in accordance with claim 1 wherein the nanocellulose is selected from one or more of cellulose nanofibres, cellulose nanocrystals and bacterial nanocelluloses.
6. An ink-receptive aqueous coating solution suitable for pearlescent paper according to claim 1 characterized in that the dispersant is polyethylene glycol having a molecular weight of 1000 to 1500.
7. An ink-receptive aqueous coating solution suitable for pearlescent paper in accordance with claim 1 wherein the fixing agent is selected from one or more of polydiallyldimethylammonium chloride, polyethyleneimine, polyvinylamine and chitosan.
8. A method for preparing an ink-receptive aqueous coating solution suitable for pearlescent paper according to any one of claims 1 to 7, comprising the steps of:
mixing ethylene-acrylic acid copolymer, polyurethane resin and water, sequentially adding fumed silica, nanocellulose and a dispersing agent, continuously stirring for 10-30 min, standing, and adding a color fixing agent under stirring to be uniform to obtain the ink-absorbing water-based coating liquid suitable for the pearlescent paper.
9. The method according to claim 8, wherein the mixing is carried out by stirring; the stirring speed is 50-150 r/min, and the stirring time is 3-8 min.
10. The preparation method according to claim 8, wherein the standing time is 20-30 h.
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| CN102732142A (en) * | 2012-07-27 | 2012-10-17 | 天津博苑高新材料有限公司 | Water-based pearlescent coating solution for digital printing and preparation method thereof |
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| CN102732142A (en) * | 2012-07-27 | 2012-10-17 | 天津博苑高新材料有限公司 | Water-based pearlescent coating solution for digital printing and preparation method thereof |
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| US20180320018A1 (en) * | 2013-12-13 | 2018-11-08 | Linwood G. Koger | Water Based Printable Coatings |
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