CN111607288A - Casein type water-based pigment yellow ink-jet ink for titanium white paper and preparation method thereof - Google Patents
Casein type water-based pigment yellow ink-jet ink for titanium white paper and preparation method thereof Download PDFInfo
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- CN111607288A CN111607288A CN202010378136.1A CN202010378136A CN111607288A CN 111607288 A CN111607288 A CN 111607288A CN 202010378136 A CN202010378136 A CN 202010378136A CN 111607288 A CN111607288 A CN 111607288A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
Abstract
The invention discloses a casein type water-based pigment yellow ink-jet ink for titanium white paper digital printing, which comprises the following components in percentage by mass: 12 to 20 percent of nano pigment yellow dispersion liquid, 3 to 15 percent of casein solution, 15 to 40 percent of humectant, 0.2 to 2.0 percent of surfactant, 0.1 to 1.0 percent of preservative and the balance of deionized water. The ink takes natural polymer casein as a connecting material, can avoid the problems of insufficient gum dipping, fading, easy edge breakage and scratch in subsequent board processing and the like in the post-processing process of the printed titanium white paper, and has good storage stability, printing smoothness and standby performance. The invention also discloses a preparation method of the ink.
Description
The technical field is as follows:
the invention relates to water-based pigment yellow ink-jet ink, in particular to casein type digital ink-jet ink for titanium white paper, and belongs to the technical field of printing and ink-jet.
Background art:
the titanium white paper has a quantitative weight of 70-90 g/m2From about 60 to 65 percentThe special paper composed of wood pulp fiber and 35-40% of titanium dioxide is widely used for surface decoration of artificial board materials, and is also commonly called decorative paper. The titanium white paper belongs to a paper product with single color tone, cannot meet the aesthetic requirement that the traditional board has wood grain, and needs to be printed and decorated by water-based ink to become decorative paper with rich and colorful patterns. The printed titanium white paper can meet the requirements of decorative board on decoration, durability and processability after the procedures of dipping, drying, hot pressing and the like of amino resin. Wherein the processability requirements of the decorative paper include: firstly, the resin can be completely soaked when being impregnated with amino resin (including urea-formaldehyde resin, melamine resin, triamine modified urea-formaldehyde resin and the like); secondly, the subsequent plates are not broken during tenon, groove and other processing; and thirdly, the surface of the plate is scratched without scratches. The three require that the decorative paper has good permeability and air permeability, and the specific indexes proposed in GB/T28995 and 2012 for the artificial board veneer are as follows: the permeability is less than or equal to 8s, and the air permeability (ancient force method) is less than 35s/100 ml.
Casein is also called casein and caseinic acid, and is a casein product extracted from cow milk. In addition to being widely used in the food industry, casein is also commonly used in industrial applications, such as tie resins for leather color finishes. The casein film forming has discontinuity, can meet the requirement of decorative paper on air permeability, has the characteristics of wide sources and environmental protection, and becomes the best choice of resin for the decorative paper printing ink.
The digital printing technology is gradually mature and rapidly developed along with the development of IT technology and modern material technology, has the advantages of individuation, flexibility, short period and environmental protection, replaces the traditional printing mode of decorative paper by the digital printing technology, can rapidly meet the market demand and meet the current great trend of environmental protection. However, there are many problems in practical application, and from the perspective of ink, the following are the main problems: (1) the pattern ink dots are easy to permeate into the titanium white paper (the titanium white paper is ultrahigh-absorption paper), so that the color performance cannot meet the requirement; (2) the titanium white paper printed with the dark color patterns is easy to fade during impregnation, which not only damages the integrity of the color patterns, but also pollutes amino resin in a glue pool, and cannot meet the requirement of continuous production.
Chinese patent CN1973089B discloses a method for manufacturing decorative laminates by means of ink jet by curtain coating at least one ink fixing layer comprising a hydrophilic binder and a non-hydrophilic polymeric binder onto a decorative base paper, printing the ink fixing layer by means of ink jet printing at high resolution, then impregnating with a melamine-formaldehyde thermosetting resin and laminating to form a low pressure laminate.
As for the ink-jet ink for manufacturing the decorative laminate, there are patent documents as follows:
EP3034572B1 (HYMMEN, germany) provides ink jet inks which achieve the desired static surface tension and viscosity of the ink using fluorosurfactants and specific oligomers, the colorant used being a pigment dispersed with a polymeric dispersant or a self-dispersing pigment, the average particle size of the pigment being less than 100nm, the ink jet ink containing a polymer latex binder which eliminates the ink receiving layer on the paper substrate, the binder used being a vinyl polymer and a condensation polymer, having stable dispersibility in the ink. Chinese patent CN108641481A provides a digital ink-jet ink for environment-friendly water-based decorative paper, the ink adopts pigment dispersion liquid prepared by a nano coating method, and wetting agents are added in a balanced manner, so that the affinity between the pigment and titanium dioxide paper is effectively improved, and the production efficiency is improved. The resin solution is styrene acrylic resin, water-soluble acrylic resin or ethoxy polyurethane resin, and the resins have good wrapping property, film forming property, re-solubility and wear resistance, can form a fixed continuous polymer film, but the air permeability requirement of the product is not easy to reach the standard, and are not beneficial to the subsequent amino resin impregnation processing procedure.
If the ink in the method is applied to the ink-jet printing of the titanium white base paper, the defect of insufficient glue penetration exists in the subsequent dipping process, which is also a problem faced by the traditional gravure mode for producing the color titanium white paper. As the special digital jet printing ink for the titanium white paper, the ink has a great promotion space in the aspects of improving the ink point penetration problem and the subsequent processing performance of decorative paper.
The invention content is as follows:
the invention provides a casein type water-based pigment yellow ink-jet ink for titanium white paper digital printing.
The invention also provides a preparation method of the ink.
The casein type water-based pigment yellow ink-jet ink for titanium white paper comprises the following components in percentage by mass: 12 to 20 percent of nano pigment yellow dispersion liquid, 3 to 15 percent of casein solution, 15 to 40 percent of humectant, 0.2 to 2.0 percent of surfactant, 0.1 to 1.0 percent of preservative and the balance of deionized water.
Casein is a protein and therefore has protein amphiphilicity and is perishable and perishable. The isoelectric point of the casein is about 4.6, the solubility of the casein in water is low, the casein is easy to form precipitates in acid, and the casein is high in solubility in dilute alkali and concentrated acid.
The casein solution of the present invention is obtained by dissolving casein in an alkali, the alkali being monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, triethylamine, N-methyl-monoethanolamine, N, N-dimethyl-monoethanolamine, N-methyl-diethanolamine, N-methyl-isopropanolamine, N, N-dimethyl-isopropanolamine, N-methyl-diisopropanolamine, N-ethyl-monoethanolamine, N, N-diethyl-monoethanolamine, N-ethyl-diethanolamine, N-ethyl-isopropanolamine, N, N-diethyl-isopropanolamine, N-ethyl-diisopropanolamine, N-propyl-monoethanolamine, N-propyl-isopropanolamine, N-isopropyl-monoethanolamine, N-isopropyl-isopropanolamine, one or more of N, N-dipropyl monoethanolamine, N, N-dipropyl monoisopropanolamine, N, N-diisopropyl monoethanolamine, N, N-diisopropyl monoisopropanolamine, N-butyl monoethanolamine, N-butyl monoisopropanolamine, diglycolamine, N-methyl diglycolamine, N, N-dimethyl diglycolamine, morpholine, N-methylmorpholine, N-ethylmorpholine, ammonia water, sodium hydroxide, potassium hydroxide and borax.
The casein contains hydrophilic groups such as carboxyl, hydroxyl, amino and the like, and the casein resin with the carboxyl groups is neutralized by low molecular weight ammonia or amine substances to generate organic amine salts which can be dissolved in water due to ionization.
The nano-scale pigment yellow dispersion liquid is nano-scale water-based pigment yellow dispersion liquid with the mass concentration of the pigment of 20-35 percent; the particle size of the dispersion is preferably 50 to 300nm, more preferably 80 to 200nm, and most preferably 90 to 150 nm.
The nano pigment yellow dispersion liquid is preferably cabot
400 series, HOSTAJET YELLOW 4G-PT of Kelaien, Bayer of Germany
One of the series of products (such as LEVANYL Yellow GN-LF, LEVANYLELOW 10G-LF, LEVANYL Yellow 5GX-LF, LEVANYL Yellow HR-LF).
The printing decorative paper takes titanium white paper as a base material, patterns such as wood grains, stone grains and the like are printed to imitate the natural landscape, and the used ink is the largest in yellow ink. The yellow pigment in the nano-scale pigment yellow dispersion used in the present invention may be a yellow pigment commonly used in the art, such as c.i. pigment yellow 83, c.i. pigment yellow 93, c.i. pigment yellow 138, c.i. pigment yellow 139, c.i. pigment yellow 150, c.i. pigment yellow 151, c.i. pigment yellow 153, c.i. pigment yellow 154, c.i. pigment yellow 155, c.i. pigment yellow 180; preferred are barbituric acid derivative-based yellow pigments such as c.i. pigment yellow 139 and c.i. pigment yellow 150, which have the following structural formulae, respectively.
The casein has a large amount of polar groups such as carboxyl, amino, hydroxyl, sulfydryl and the like, and has good dispersing effect on the pigment. The barbituric acid is also called malonylurea, wherein a pyrimidine heterocyclic structure containing carbonyl and peptide bonds and active groups in casein molecules can form a large number of intermolecular hydrogen bonds and secondary bonds, so that the casein solution has good dispersion stability and leveling effect on yellow pigment containing a barbituric acid derivative structure, the yellow pigment is better in color spreading, and the problem of penetration of yellow ink spots on titanium white paper can be prevented.
The humectant is a water-soluble organic solvent with high boiling point and low volatility, and is one or more of 1, 2-propylene glycol, 1, 3-propylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, glycerol, sorbitol, xylitol, dimethyl sulfoxide, 1, 2-hexanediol and 1,2, 6-hexanetriol.
The aqueous pigment jet ink of the present invention comprises at least one surfactant which is a non-ionic surfactant, preferably ethoxylated acetylenic diols and polyether modified siloxanes. Further preferably, the surfactant may be one or more of Surfynol 465, Surfynol 485, Dynol 604, Dynol 607, Dynol 960, Dynol 980, TEGO 410, TEGO 440, TEGO 450, TEGO245, TEGO 270, BYK 346, BYK 348, BYK 3580 of bekk, germany, and more preferably, the surfactant is one or more of Dynol 604, Dynol 607, BYK 346, BYK 348.
The microorganisms that cause decay in inkjet inks are mainly gram-negative bacteria, especially the genera enterotoxigenic and pseudomonas; the coating film after ink jet printing is easy to generate mould such as aspergillus niger, penicillium and the like. The bactericidal preservative can denature proteins in microorganisms, reduce activity of cells, promote cell death, and also can cause mutation of cytogenetic genes of microorganisms or interfere activity of enzymes in cells, so that propagation is difficult. The preservative is isothiazolinone, and preferably 1, 2-benzisothiazolin-3-one.
The preparation method of the casein type water-based pigment yellow ink-jet ink for the titanium white paper comprises the following steps:
(1) dissolving casein by using alkali to prepare a casein solution with the mass fraction of 3-10%, and filtering after 24 hours for later use;
(2) uniformly mixing a humectant, a surfactant, a preservative, deionized water and the casein solution obtained in the step (1), adding the nano pigment yellow dispersion, uniformly stirring at a high speed, and grinding by a sand mill until the particle size is less than 200 nm;
(3) standing and aging the ink obtained in the step (2) at room temperature for 12-24 hours, and after aging is completed, performing graded filtration by using a filter element to remove harmful impurities to obtain a finished ink product;
(4) the prepared ink can be used for digital printing of titanium white paper.
In order to prevent the casein from being corrupted, a proper amount of preservative is required to be added when preparing the casein solution, the preferred preservative is one of 1, 2-benzisothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, and the more preferred preservative is 1, 2-benzisothiazolin-3-one.
The high-speed stirring in the step (2) is carried out at a rotating speed of 400-1000 rpm, and the stirring time is 30-60 minutes;
and (3) standing and aging to enable a dispersion system in the ink to be balanced, and insoluble substances and unstable colloids are separated out, wherein the filter element in the step (3) is a polyvinylidene fluoride filter element, and the graded filtration is respectively 1 micrometer and 0.5 micrometer.
Compared with the prior art, the product provided by the invention has the following advantages:
(1) the natural polymer casein is used as a connecting material, has the characteristics of strong adhesive force and high temperature resistance, is discontinuous and loose in film forming and good in air permeability, ensures that the decorative paper has good permeability and air permeability, and is beneficial to the permeation of amino resin molecules and the release of by-product water generated by resin crosslinking and curing in the hot pressing process, so that the problems of insufficient glue permeation, color loss, easy edge breakage and scratch in subsequent plate processing and the like in the gum dipping process of the decorative paper can be effectively avoided. The nano-scale water-based pigment yellow dispersion liquid adopted by the invention has good compatibility with casein solution, the prepared ink-jet ink has fine pigment particles, centralized particle size distribution and stable dispersion, and the ink has excellent storage stability, printing fluency and standby performance.
(2) The casein used in the invention has wide sources, is green and environment-friendly, is a renewable raw material which can be completely biodegraded, and the prepared ink does not contain substances which are toxic or harmful to human bodies and environment and has good compatibility.
Detailed Description
The present invention is further illustrated by the following specific embodiments, which are not meant to limit the scope of the invention.
Example 1:
preparation of casein solution: 0.19g of diisopropanolamine and 34.2g of deionized water are mixed to prepare a solvent mixture, 1.8g of casein powder (national medicine group) is dissolved in the solvent mixture, the mixture is stirred uniformly to prepare a casein solution with the mass concentration of 5 percent, 0.04g of preservative 1, 2-benzisothiazolin-3-one is added, and the mixture is filtered by 400 meshes of filter cloth for standby after 24 hours.
Preparing water-based pigment ink-jet ink: (1) 200g of humectant glycerol, 4g of ethoxylated acetylene glycol surfactant Dynol 604 (American air chemical industry), 2g of preservative 1, 2-benzisothiazolin-3-one, the filtered 5% casein solution and 638g of deionized water are mixed and stirred uniformly.
(2) Adding 120g of nano pigment yellow dispersion (LeVANYLELOW GN-LF, Germany) into the mixed solution in the step (1), stirring at a high speed (the rotating speed is 600 revolutions per minute) for 1 hour, and grinding by a sand mill until the particle size is less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Example 2:
preparation of casein solution: 0.21g of triethylamine and 84.4g of deionized water are mixed to prepare a solvent mixture, 2.6g of casein powder (Sigma reagent company) is dissolved in the solvent mixture, the mixture is stirred uniformly to prepare a casein solution with the mass concentration of 3 percent, 0.09g of preservative 1, 2-benzisothiazolin-3-one is added, and the mixture is filtered by 400-mesh filter cloth for standby after 24 hours.
Preparing water-based pigment ink-jet ink: (1) 250g of humectant 1, 2-propylene glycol, 8g of polyether modified siloxane surfactant BYK 346 (German Bick chemical), 3g of preservative 1, 2-benzisothiazolin-3-one, the filtered 3% casein solution and 522g of deionized water are mixed and stirred uniformly.
(2) 130G of nano pigment yellow dispersion liquid (Clarian Hostajewalow 4G-PT) is added into the mixed solution in the step (1), stirred at a high speed (the rotating speed is 600 revolutions per minute) for 1 hour, and then milled by a sand mill until the particle size is less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Example 3:
preparation of casein solution: 0.83g of triisopropanolamine and 129.6g of deionized water are mixed to prepare a solvent mixture, 5.4g of casein powder (Sigma reagent company) is dissolved in the solvent mixture, the mixture is stirred uniformly to prepare a casein solution with the mass concentration of 4 percent, 0.14g of preservative 1, 2-benzisothiazolin-3-one is added, and after 24 hours, the mixture is filtered by 400-mesh filter cloth for later use.
Preparing water-based pigment ink-jet ink: (1) 200g of humectant 1, 3-propylene glycol, 5g of polyether modified siloxane surfactant BYK 346 (German Bick chemical), 4g of preservative 1, 2-benzisothiazolin-3-one, the filtered 4% casein solution and 506g of deionized water are mixed and stirred uniformly.
(2) 150g of a nanosized pigment yellow dispersion (Levanylyocell HR-LF, Germany) was added to the mixed solution of step (1), stirred at a high speed (600 rpm) for 1 hour, and milled by a sand mill to a particle size of less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Example 4:
preparation of casein solution: mixing 0.94g of diethanolamine and 128.8g of deionized water to prepare a solvent mixture, dissolving 11.2g of casein powder (national drug group) in the solvent mixture, uniformly stirring the mixture to prepare a casein solution with the mass concentration of 8%, adding 0.14g of preservative 1, 2-benzisothiazolin-3-one, and filtering the mixture by a 400-mesh filter cloth for later use after 24 hours.
Preparing water-based pigment ink-jet ink: (1) 150g of humectant diethylene glycol, 10g of ethoxylated acetylene glycol surfactant Dynol 607 (American air chemical industry), 10g of preservative 1, 2-benzisothiazolin-3-one, the filtered 8% casein solution and 530g of deionized water were mixed and stirred uniformly.
(2) 160g of a nanoscale pigment yellow dispersion (Kabot, USA) was added to the mixed solution in step (1)
400) Stirring at high speed (600 rpm) for 1 hr, and grinding to particle size less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Example 5:
preparation of casein solution: mixing 1.07g triethanolamine and 81g deionized water to prepare a solvent mixture, dissolving 9g casein powder (Aladdin chemical reagent company) in the solvent mixture, stirring uniformly to prepare a casein solution with the mass concentration of 10%, adding 0.09g preservative 1, 2-benzisothiazolin-3-one, and filtering with 400-mesh filter cloth for later use after 24 hours.
Preparing water-based pigment ink-jet ink: (1) 350g of humectant polyethylene glycol 200, 15g of ethoxylated acetylene glycol surfactant Dynol 604 (American air chemical industry), 8g of preservative 1, 2-benzisothiazolin-3-one, the filtered 10% casein solution and 357g of deionized water are mixed and stirred uniformly.
(2) Adding 180G of nano pigment yellow dispersion (Levanylyocell 10G-LF, Germany) into the mixed solution in the step (1), stirring at a high speed (the rotating speed is 600 revolutions per minute) for 1 hour, and grinding by a sand mill until the particle size is less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Example 6:
preparation of casein solution: mixing 0.27g of diethanolamine and 36.8g of deionized water to prepare a solvent mixture, dissolving 3.2g of casein powder (Aladdin chemical reagent company) in the solvent mixture, stirring the mixture evenly to prepare a casein solution with the mass concentration of 8 percent, adding 0.04g of preservative 1, 2-benzisothiazolin-3-one, and filtering the mixture by a 400-mesh filter cloth for standby after 24 hours.
Preparing water-based pigment ink-jet ink: (1) 400g of sorbitol as a humectant, 20g of Dynol 607 (American air chemical industry) as an ethoxylated acetylene glycol surfactant, 1g of 1, 2-benzisothiazolin-3-one as a preservative, the filtered 8% casein solution and 339g of deionized water are mixed and stirred uniformly.
(2) Adding 200g of nano pigment yellow dispersion (Levanylyocell 5GX-LF, Germany) into the mixed solution in the step (1), stirring at a high speed (the rotating speed is 600 revolutions per minute) for 1 hour, and grinding by a sand mill until the particle size is less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the casein type water-based pigment yellow ink-jet ink for the titanium white paper.
Comparative example 1:
preparing water-based pigment ink-jet ink: (1) 350g of humectant glycerol, 5g of ethoxylated acetylenic diol surfactant Dynol 607 (American air chemical), 2g of preservative 1, 2-benzisothiazolin-3-one, 7.6g of styrene-acrylic colloidal emulsion (BASF Joncryl142, Germany) and 515.4g of deionized water were mixed and stirred uniformly.
(2) Adding 120G of nano pigment yellow dispersion (Clarian Hostajewalow 4G-PT) into the mixed solution in the step (1), stirring at a high speed (the rotating speed is 600 revolutions per minute) for 1 hour, and grinding by a sand mill until the particle size is less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the water-based pigment yellow ink-jet ink for the titanium white paper.
Comparative example 2:
preparing water-based pigment ink-jet ink: (1) 300g of humectant 1, 3-propylene glycol, 6g of modified siloxane surfactant BYK 346 (German Bick chemical), 3g of preservative 1, 2-benzisothiazolin-3-one, 5g of waterborne polyurethane resin (Anhui Dahuatai AH-1502) and 536g of deionized water are mixed and stirred uniformly.
(2) 150g of a nanosized pigment yellow dispersion (Levanylyocell HR-LF, Germany) was added to the mixed solution of step (1), stirred at a high speed (600 rpm) for 1 hour, and milled by a sand mill to a particle size of less than 200 nm.
(3) And (3) standing and aging the ink obtained in the step (2) at room temperature for 24 hours, and carrying out graded filtration and packaging by using two polyvinylidene fluoride filter cores (of Hangzhou Kebaite company) of 1 micron and 0.5 micron in sequence to obtain a finished product of the water-based pigment yellow ink-jet ink for the titanium white paper.
The test method of the product obtained by the invention is as follows:
print fluency and standby performance: the printing test is carried out by using an Epson large-format printer (EPSON P10080) in an indoor environment with the temperature of 18-28 ℃ and the relative humidity of 50% -70%.
Gum dipping performance: and (3) immersing the titanium white paper sample printed with the pattern into melamine resin, and evaluating the impregnation and fading conditions according to GB/T28995-2012, which is special paper for artificial board veneer.
Anti-aging stability of ink: a20 g sample of the prepared ink was stored in a glass reagent bottle in a sealed state, and left in a water bath at 60 ℃ for 2 weeks, and the change in the appearance of the ink was observed, and the particle size of the ink was measured by a laser particle sizer (Bettersize 2600, Denton, a Baite apparatus).
1-obviously layering, wherein the upper layer is transparent clear liquid;
2, obviously layering, and enabling the upper layer to be turbid;
3, slightly layering, and removing layering after shaking;
4-no delamination, large particle size tested;
5-no delamination, no large particle size tested.
The pH value is measured by a PHS-3C type pH meter (Shanghai thunder magnetic) (25 ℃);
the conductivity is measured by a DDS-307 conductivity meter (Shanghai thunder magnetic) (25 ℃);
the viscosity was measured using a T-series rotary viscometer (Shanghai Fangrui instruments Co.);
the surface tension was measured using a BYZ series automatic surface tensiometer (Shanghai Fairy instruments Co.).
TABLE 1 Performance parameters of the aqueous pigmented yellow inkjet inks of examples 1-6 and comparative examples 1-2
TABLE 2 results of performance test of the ink products of examples 1 to 6 and comparative examples 1 to 2
The above results show that compared with the comparative example, the ink finished product prepared by the invention has the following advantages:
(1) the invention takes casein as a connecting material, and a discontinuous film formed by casein solution has the characteristics of looseness and porosity, so that the printed titanium white paper has good permeability and air permeability, and the product prepared by the invention meets the requirements in national standard' special paper for artificial board facing GB/T28995-: the permeability is less than or equal to 8s, the air permeability (ancient method) is less than 35s/100ml, and almost no fading phenomenon exists in the gum dipping process.
(2) The nano pigment dispersion liquid and the casein solution adopted by the invention have good compatibility, and the prepared ink has good storage stability, printing fluency and standby performance.
The above embodiments are only preferred embodiments of the present invention, and obviously not all embodiments, but all modifications, substitutions and improvements made within the spirit and scope of the present invention are included in the claims of the present invention.
Claims (7)
1. The casein type water-based pigment yellow ink-jet ink for the titanium white paper comprises a nano pigment yellow dispersion liquid, a humectant, a surfactant, a preservative and deionized water, and is characterized by comprising the following components in percentage by mass:
the casein solution is prepared by dissolving casein in alkali, wherein the alkali is monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, triethylamine, N-methyl-monoethanolamine, N, N-dimethyl-monoethanolamine, N-methyl-diethanolamine, N-methyl-isopropanolamine, N, N-dimethyl-isopropanolamine, N-methyl-diisopropanolamine, N-ethyl-monoethanolamine, N, N-diethyl-monoethanolamine, N-ethyl-diethanolamine, N-ethyl-isopropanolamine, N, N-diethyl-isopropanolamine, N-ethyl-diisopropanolamine, N-propyl-monoethanolamine, N-propyl-isopropanolamine, N-isopropyl-monoethanolamine, N-isopropyl-isopropanolamine, N, one or more of N-dipropyl monoethanolamine, N, N-dipropyl monoisopropanolamine, N, N-diisopropyl monoethanolamine, N, N-diisopropyl monoisopropanolamine, N-butyl monoethanolamine, N-butyl monoisopropanolamine, diglycolamine, N-methyl diglycolamine, N, N-dimethyl diglycolamine, morpholine, N-methylmorpholine, N-ethylmorpholine, ammonia water, sodium hydroxide, potassium hydroxide and borax.
2. The casein-based aqueous pigment yellow inkjet ink for titanium white paper according to claim 1, wherein the nano-scale pigment yellow dispersion liquid is a nano-scale aqueous pigment yellow dispersion liquid having a pigment mass concentration of 20% to 35%.
3. The casein-based aqueous pigment yellow inkjet ink for titanium white paper according to claim 2, wherein the yellow pigment in the nano-scale pigment yellow dispersion liquid is a barbituric acid derivative-based yellow pigment.
4. The casein-based aqueous pigment yellow inkjet ink for white titanium paper according to claim 3, wherein the humectant is one or more selected from 1, 2-propylene glycol, 1, 3-propylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, glycerol, sorbitol, xylitol, dimethyl sulfoxide, 1, 2-hexanediol, and 1,2, 6-hexanetriol;
the surfactant is a nonionic surfactant;
the preservative is isothiazolinone.
5. The aqueous pigment yellow inkjet ink for titanium white paper of claim 4, wherein the nonionic surfactant is an ethoxylated acetylene glycol or polyether-modified siloxane.
6. The method for preparing the casein type water-based pigment yellow ink-jet ink for titanium white paper according to claims 1 to 5, characterized by comprising the following steps:
(1) dissolving casein by using alkali to prepare a casein solution with the mass fraction of 3-10%, and filtering after 24 hours for later use;
(2) uniformly mixing a humectant, a surfactant, a preservative, deionized water and the casein solution obtained in the step (1), adding the nano pigment yellow dispersion, uniformly stirring at a high speed, and grinding by a sand mill until the particle size is less than 200 nm;
(3) standing and aging the ink obtained in the step (2) at room temperature for 12-24 hours, and after aging is completed, performing graded filtration by using a filter element to remove harmful impurities to obtain a finished ink product;
(4) the prepared ink can be used for digital printing of titanium white paper.
7. The method for preparing the casein type water-based pigment yellow ink-jet ink for titanium white paper as claimed in claim 6, wherein the rotation speed of the high-speed stirring in the step (2) is 400-1000 r/min, and the stirring time is 30-60 min; the filter element in the step (3) is a polyvinylidene fluoride filter element, and the graded filtration is respectively 1 μm and 0.5 μm.
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