CN112375429A - Digital printing pigment ink and preparation method thereof - Google Patents
Digital printing pigment ink and preparation method thereof Download PDFInfo
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- CN112375429A CN112375429A CN202011277316.7A CN202011277316A CN112375429A CN 112375429 A CN112375429 A CN 112375429A CN 202011277316 A CN202011277316 A CN 202011277316A CN 112375429 A CN112375429 A CN 112375429A
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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
- C09D11/322—Pigment 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
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/58—Material containing hydroxyl groups
- D06P3/60—Natural or regenerated cellulose
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/30—Ink jet printing
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- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention discloses a digital printing pigment ink, which comprises the following components in percentage by weight: 8 to 12 percent of nano organic pigment, 0.5 to 3 percent of dispersing wetting agent, 0.5 to 2 percent of adhesive, 5 to 15 percent of humectant, 0.1 to 1 percent of preservative, 5 to 10 percent of viscosity regulator, 0.1 to 1 percent of pH regulator and the balance of deionized water; the particle size of the nano-scale organic pigment is 50-100 nm. The digital printing pigment ink has the advantages of low preparation cost, good long-term storage stability, low possibility of flocculation, aggregation, precipitation and layering, moderate viscosity and surface tension, good fluidity of the ink in a pipeline, smooth printing, good printing effect, good fastness to washing, dry and wet rubbing and capability of meeting the wearing requirements of customers.
Description
Technical Field
The invention relates to the technical field of digital printing, in particular to digital printing pigment ink and a preparation method thereof.
Background
The digital printing is to input the pattern into the computer in digital form, edit and process by computer printing color-separation draft system (CAD), and then the computer controls the micro-piezoelectric ink jet nozzle to directly spray the special dye solution onto the textile or other medium to form various high-precision patterns. Compared with the traditional printing and dyeing process, the digital printing has the following advantages: 1. the production process of digital printing greatly shortens the original process route, has high order receiving speed and greatly reduces the proofing cost; 2. the principle of the digital printing technology enables the product to break the restrictions of the traditional production on color register and the length of the pattern, and the printing effect of high-grade printing of the textile fabric can be realized; 3. the digital printing production really realizes the production process of small batch and quick reaction, and the production batch is not limited at all; 4. the high-precision spray printing process ensures that no water or color paste is used in the spray printing process.
Digital printing inks can be classified into dye inks and pigment inks according to the pigment classification used. Compared with dye inks, pigment inks have the following advantages: 1. the method has universality for different fibers. Different fibers require different dye inks, while pigment inks are suitable for use with a variety of fibers. 2. The process is simple. The pigment ink is used for digital printing of the fabric, does not need complex pretreatment and post-treatment processes, directly performs ink-jet printing on the fabric, and then only needs simple baking, so that the process is simple and convenient, and the operation is simple. 3. Environmental protection and no sewage discharge. The pigment is adhered to the surface of the fabric by the adhesive, so that floating color cannot be generated on the fiber, and the pigment type digital ink-jet printing is not required to be washed and soaped after being baked and fixed, thereby achieving the effect of emission reduction. 4. The light fastness is good. The pigment ink is sprayed on the fabric and then exists on the fabric in a state of fine particles, each of which contains a large number of pigment molecules, and the inner layer maintains color even if the pigment molecules of the outer layer are decomposed by light. The dye exists on the fabric in a molecular state, is easily decomposed by light and easily loses the color effect.
The research on the dye ink for inkjet printing of textiles is mature, while the research on the pigment ink is still in the early stage, and the products are not mature enough. At present, the pigment ink sold and used in the market is relatively few, wherein the ink with higher quality is mostly imported products and is very expensive, and compared with the ink sold in the market, although the price is relatively cheap, the performances of the ink are still very different, and the current situations limit the application and popularization of the pigment type ink-jet printing technology. Therefore, the development of the pigment ink with low price, good jet printing effect and excellent stability has very important practical significance.
Disclosure of Invention
In order to solve the above-mentioned disadvantages and drawbacks of the prior art, an object of the present invention is to provide a digital printing pigment ink. The digital printing pigment ink has the advantages of low preparation cost, good long-term storage stability, moderate viscosity and surface tension, good fluidity in pipelines, smooth printing, good printing effect, washing resistance, light resistance, friction resistance and high drying speed of printed products.
In order to realize the purpose, the invention adopts the technical scheme that:
the digital printing pigment ink comprises the following components in percentage by weight: 8 to 12 percent of nano organic pigment, 0.5 to 3 percent of dispersing wetting agent, 0.5 to 2 percent of adhesive, 5 to 15 percent of humectant, 0.1 to 1 percent of preservative, 5 to 10 percent of viscosity regulator, 0.1 to 1 percent of pH regulator and the balance of deionized water.
Preferably, the particle size of the nanoscale organic pigment is 50-100 nm. When the organic pigment with the granularity is stirred and passes through a nozzle at a high speed, the grain diameter of the organic pigment can still be kept unchanged or changed slightly, and the printing effect is better. Meanwhile, the particle size of the pigment can influence the coloring strength of the pigment, the nanoscale organic pigment with the particle size of 50-100 nm has better coloring power, and the coloring power is reduced when the particle size is higher or lower than the particle size.
Preferably, the nanoscale organic pigment comprises at least one of permanent orange RN, gold light red, benzidine yellow G, phthalocyanine blue, phthalocyanine red, phthalocyanine violet, permanent violet RL, pigment yellow 2GLT, permanent orange HSL. The nano-scale organic pigment has higher tinting strength, easy grinding and dispersion of particles, bright color, low density and no toxicity.
The nanoscale organic pigment has small particle size and large specific surface area and surface energy, and is easy to self-agglomerate, so that the organic pigment is difficult to disperse into nanoscale particles in water. The dispersing wetting agent is added to effectively prevent pigment particles from agglomerating, so that the pigment particles can keep better dispersion stability in water. The dispersing wetting agent can also improve the wetting property of pigment ions, and the good wetting property can ensure that pigment particles can be rapidly contacted with a dispersing medium, thereby being beneficial to the dispersion of the particles.
Preferably, the dispersing wetting agent comprises sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignosulfonate. Sodium dodecyl sulfonate belongs to an anionic surfactant and has excellent functions of permeation, washing, wetting, decontamination and emulsification. The fatty alcohol-polyoxyethylene ether belongs to a nonionic surfactant, and has the advantages of high stability, good water solubility, electrolyte resistance, easy biodegradation and small foam. The sodium lignosulfonate is a natural high molecular polymer and has strong dispersibility. According to the invention, researches show that when the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether and the sodium lignosulfonate are used together, the dispersing and wetting effects can be simultaneously shown, so that the pigment can be rapidly dispersed in water in a micro-particle state, a space barrier force is provided among pigment particles, the pigment particles are prevented from sinking and flocculating, and the good dispersion stability of the pigment particles is kept.
Preferably, in the dispersion wetting agent, by mass ratio, sodium dodecyl sulfate: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1 (0.01-0.1). When the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether and the sodium lignin sulfonate are used together according to the proportion, the dispersing and wetting agent shows better dispersing and wetting effects.
Most preferably, in the dispersion wetting agent, sodium dodecyl sulfate: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. When the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether and the sodium lignin sulfonate are used together according to the proportion, the dispersing and wetting agent has the best dispersing and wetting effects.
The invention also finds that the amount of the dispersing wetting agent can influence the dispersibility of the pigment through experiments. If the amount of the dispersing wetting agent is too large or too small, the dispersibility of the pigment is lowered, and the pigment is liable to be precipitated or agglomerated. In the formula of the invention, when the dosage of the dispersing wetting agent reaches 0.5-3%, the pigment has better dispersion stability and can not be settled or agglomerated.
Preferably, the binder comprises a polyacrylate and a butadiene copolymer. Preferably, the butadiene copolymer is selected from the group consisting of a copolymer of butadiene and styrene or/and a copolymer of butadiene and acrylonitrile. The butadiene copolymer has high relative molecular weight, and has the advantages of soft hand feeling, good elasticity, low price and the like. However, butadiene is a soft monomer, and the copolymer contains double bonds and is easily oxidized to cause yellowing of the film, and the adhesive force, light resistance, transparency and solvent resistance are poor. The polyacrylate can form a water-resistant film with good gloss, firm adhesion, difficult peeling and good weather resistance. According to the invention, researches show that the adhesive force, the weather resistance and the film forming property of the adhesive can be obviously improved by compounding the polyacrylate and the butadiene copolymer, and the printing fastness and the washing fastness of the ink are improved.
Preferably, in the adhesive, the weight ratio of polyacrylate: and (3) 1 for butadiene copolymers. When the polyacrylate and the butadiene copolymer are compounded according to the mass ratio, the comprehensive performance of the adhesive is better.
Preferably, in the adhesive, the weight ratio of polyacrylate: butadiene copolymer 2: 1. When the polyacrylate and the butadiene copolymer are compounded according to the mass ratio, the comprehensive performance of the adhesive is best.
According to the invention, the research also finds that if the addition amount of the adhesive is too large, the viscosity of the ink is too large, and the jetting performance of the ink is influenced; if the amount of the binder added is too small, insufficient print fastness will result. When the dosage of the adhesive in the formula of the invention reaches 0.5-2%, the viscosity of the ink is appropriate, and the printing effect is good.
Preferably, the humectants include sorbitol, potassium tripolyphosphate, and diethylene glycol. The humectant can effectively inhibit the volatilization of water in the ink, thereby preventing the ink from becoming concentrated and precipitating pigment particles. According to the invention, through research, sorbitol, potassium tripolyphosphate and diethylene glycol are compounded to be used as a humectant, so that the moisturizing agent has a remarkable moisturizing effect, and can effectively prevent water in ink from volatilizing for a long time.
Preferably, in the humectant, the ratio by mass of sorbitol: potassium tripolyphosphate: diethylene glycol 1:1 (0.1 to 0.5). When the sorbitol, the potassium tripolyphosphate and the diglycol are compounded in the proportion to be used as the humectant, the moisturizing effect is obvious.
Preferably, in the humectant, the ratio by mass of sorbitol: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. When the sorbitol, the potassium tripolyphosphate and the diglycol are compounded in the proportion to be used as the humectant, the moisturizing effect is most remarkable.
Preferably, the preservative comprises at least one of a sorbate ester, 1, 2-benzisothiazolin-3-one, preservative YL 50. The preservative has broad spectrum, high efficiency, low toxicity, good compatibility and strong stability, and can effectively prevent the generation of mould, thereby effectively preventing black channels and spray heads from being blocked and prolonging the service life of the spray heads.
Preferably, the viscosity regulator comprises at least one of triethylene glycol methyl ether, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and urea. The pigment ink is used as a fluid, whether the fluid can smoothly flow when a nozzle and an ink channel pass through the fluid, and the viscosity is an important index and has important influence on the printing smoothness of the ink-jet printing ink. If the viscosity of the ink is too low, ink drops are easy to break, so that printed lines are not smooth and fine. If the viscosity of the ink is too high, the broken tail may be elongated and formed into a drawn line when the ink is ejected from the nozzle. When the amount of the viscosity regulator in the formula of the invention reaches 5-10%, the ink has proper and stable viscosity, and can obtain better printing effect.
Preferably, the pH adjuster includes at least one of lactic acid, sodium hydroxide, citric acid, and tris.
The pH value of the digital printing pigment ink obtained by the formula is 7.7-8.3, and the viscosity is 2.0-3.4 mPa.S. Therefore, the digital printing pigment ink has a proper pH value, does not generate electrochemical corrosion on a spray head, and does not damage the spray head and block a pipeline. The digital printing pigment ink also has proper viscosity, good fluidity, smooth printing and good printing effect.
Preferably, the digital printing pigment ink consists of the following components in percentage by weight: 10% of nano-scale organic pigment, 2% of dispersing wetting agent, 1.2% of adhesive, 10% of humectant, 0.5% of preservative, 7% of viscosity regulator, 0.5% of pH regulator and the balance of deionized water. The digital printing pigment ink obtained by the formula has the best comprehensive performance and low preparation cost.
The invention also provides a preparation method of the digital printing pigment ink, which comprises the following steps: mixing the nanoscale organic pigment, the dispersing wetting agent and a proper amount of deionized water, heating to 55-65 ℃, uniformly stirring, then adding the adhesive, the humectant, the preservative, the viscosity regulator, the pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 10-20 min, and discharging to obtain the digital printing pigment ink.
Compared with the prior art, the invention has the beneficial effects that: the digital printing pigment ink has the advantages of low preparation cost, good long-term storage stability, low possibility of flocculation, aggregation, precipitation and layering, moderate viscosity and surface tension, good fluidity of the ink in a pipeline, smooth printing, good printing effect, good fastness to washing, dry and wet rubbing and capability of meeting the wearing requirements of customers.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention is further illustrated by the following examples. It is apparent that the following examples are only a part of the embodiments of the present invention, and not all of them. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
The digital printing pigment ink comprises the following components in percentage by weight: 10% of nano-scale organic pigment (golden bright red), 2% of dispersing wetting agent, 1.2% of adhesive, 10% of humectant, 0.5% of preservative, 7% of viscosity regulator, 0.5% of pH regulator and the balance of deionized water. The dispersing and wetting agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. The adhesive is composed of polyacrylate and butadiene copolymer, and the mass ratio of polyacrylate: a butadiene copolymer is 2:1, which is a copolymer of butadiene and styrene. The humectant consists of sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass ratio of sorbitol is as follows: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. The preservative is sorbate, the viscosity regulator is triethylene glycol methyl ether, and the pH regulator is citric acid.
The preparation method of the digital printing pigment ink comprises the following steps: mixing the nanoscale organic pigment with the particle size of 50-100 nm, a dispersing wetting agent and a proper amount of deionized water, heating to 60 ℃, uniformly stirring, adding an adhesive, a wetting agent, a preservative, a viscosity regulator, a pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 15min, and discharging to obtain the digital printing pigment ink.
Example 2
The digital printing pigment ink comprises the following components in percentage by weight: 11% of nano-scale organic pigment (golden bright red), 2.5% of dispersing wetting agent, 1.5% of adhesive, 12% of wetting agent, 0.5% of preservative, 5.2% of viscosity regulator, 0.3% of pH regulator and the balance of deionized water. The dispersing and wetting agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. The adhesive is composed of polyacrylate and butadiene copolymer, and the mass ratio of polyacrylate: a butadiene copolymer is 2:1, which is a copolymer of butadiene and styrene. The humectant consists of sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass ratio of sorbitol is as follows: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. The preservative is sorbate, the viscosity regulator is triethylene glycol monomethyl ether, the pH regulator is citric acid and sodium hydroxide, and the mass ratio of the citric acid: sodium hydroxide 8: 1.
The preparation method of the digital printing pigment ink comprises the following steps: mixing the nanoscale organic pigment with the particle size of 50-100 nm, a dispersing wetting agent and a proper amount of deionized water, heating to 60 ℃, uniformly stirring, adding an adhesive, a wetting agent, a preservative, a viscosity regulator, a pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 20min, and discharging to obtain the digital printing pigment ink.
Example 3
The digital printing pigment ink comprises the following components in percentage by weight: 9% of nano-scale organic pigment (golden bright red), 1% of dispersing wetting agent, 0.8% of adhesive, 10% of humectant, 0.2% of preservative, 9% of viscosity regulator, 1% of pH regulator and the balance of deionized water. The dispersing and wetting agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. The adhesive is composed of polyacrylate and butadiene copolymer, and the mass ratio of polyacrylate: a butadiene copolymer is 2:1, which is a copolymer of butadiene and styrene. The humectant consists of sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass ratio of sorbitol is as follows: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. The preservative is a preservative YL50, the viscosity regulator is polyethylene glycol methyl ether, and the pH regulator is citric acid.
The preparation method of the digital printing pigment ink comprises the following steps: mixing the nanoscale organic pigment with the particle size of 50-100 nm, a dispersing wetting agent and a proper amount of deionized water, heating to 55 ℃, uniformly stirring, adding an adhesive, a wetting agent, a preservative, a viscosity regulator, a pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 15min, and discharging to obtain the digital printing pigment ink.
Example 4
The digital printing pigment ink comprises the following components in percentage by weight: 8% of nano-scale organic pigment (golden light red), 0.5% of dispersing wetting agent, 0.5% of adhesive, 15% of humectant, 0.1% of preservative, 10% of viscosity regulator, 0.2% of pH regulator and the balance of deionized water. The dispersing and wetting agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. The adhesive is composed of polyacrylate and butadiene copolymer, and the mass ratio of polyacrylate: a butadiene copolymer is 2:1, which is a copolymer of butadiene and acrylonitrile. The humectant consists of sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass ratio of sorbitol is as follows: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. The preservative is 1, 2-benzisothiazolin-3-one, the viscosity regulator is polyethylene glycol 200, and the pH regulator is citric acid.
The preparation method of the digital printing pigment ink comprises the following steps: mixing the nanoscale organic pigment with the particle size of 50-100 nm, a dispersing wetting agent and a proper amount of deionized water, heating to 55 ℃, uniformly stirring, adding an adhesive, a wetting agent, a preservative, a viscosity regulator, a pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 10min, and discharging to obtain the digital printing pigment ink.
Example 5
The digital printing pigment ink comprises the following components in percentage by weight: 12% of nano-scale organic pigment (golden bright red), 3% of dispersing wetting agent, 2% of adhesive, 5% of humectant, 1% of preservative, 5% of viscosity regulator, 0.1% of pH regulator and the balance of deionized water. The dispersing and wetting agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05. The adhesive is composed of polyacrylate and butadiene copolymer, and the mass ratio of polyacrylate: a butadiene copolymer is 2:1, which is a copolymer of butadiene and acrylonitrile. The humectant consists of sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass ratio of sorbitol is as follows: potassium tripolyphosphate: diethylene glycol 1:1: 0.3. The preservative is sorbate, the viscosity regulator is urea, the pH regulator is citric acid and tris (hydroxymethyl) aminomethane, and the mass ratio of the citric acid: tris ═ 6: 1.
The preparation method of the digital printing pigment ink comprises the following steps: mixing the nanoscale organic pigment with the particle size of 50-100 nm, a dispersing wetting agent and a proper amount of deionized water, heating to 65 ℃, uniformly stirring, adding an adhesive, a wetting agent, a preservative, a viscosity regulator, a pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 20min, and discharging to obtain the digital printing pigment ink.
Performance testing
The performance test results of the digital printing pigment ink prepared in the embodiments 1 to 5 of the invention are shown in the following table.
And (3) viscosity testing: the viscosity of the pigment ink was measured three times at a constant temperature of 25 ℃ using a malvern rotational rheometer, and the average value was taken.
pH value: the pH of the pigment ink was measured with an acidimeter at a constant temperature of 25 ℃.
Intermittent printing effect: printing can be carried out after 7 days of intermission, the effect is the same as that of a standard sample, and the product is qualified; otherwise, the product is not qualified.
Stability: (40 +/-1) DEG C, sealing for 120h without deterioration, and determining to be qualified; otherwise, the product is not qualified.
Dispersibility: the mixture is placed at a constant temperature of 25 ℃ for 7 days, and the phenomena of layering, precipitation, flocculation and the like do not occur, so that the product is qualified; otherwise, the product is not qualified.
From the results in the table above, it can be seen that: the inks of embodiments 1 to 5 of the present invention have suitable viscosity and pH, good fluency, low volatility, good moisture retention, and good dispersion stability.
Testing of print clarity
Using the drawing program of Chinese WORD2003, three straight lines with the line width of 1mm are longitudinally drawn, printed on the cotton fabric, observed by a high power microscope, and the widths of a plurality of parts of the lines in the printed pattern are measured and used as the printing width. The printing definition is calculated through a formula, and the smaller the printing definition value is, the better the ink printing effect is.
Print definition ═ printing width-standard width/standard width
The control group used epression 1390 high-end pure cotton textile coating ink.
The printing definition test results of the digital printing pigment ink prepared in the embodiments 1 to 5 of the invention are shown in the following table.
| Test sample | Print definition on cotton fabrics |
| Example 1 | 0.002 |
| Example 2 | 0.004 |
| Example 3 | 0.003 |
| Example 4 | 0.005 |
| Example 5 | 0.005 |
| Control group | 0.001 |
From the results in the table above, it can be seen that: the inks of the embodiments 1 to 5 of the invention have better printing definition, the printing definition is equivalent to the effect of similar imported inks, and especially the ink prepared by the embodiment 1 has the best performance.
Fastness to printing test
1. Testing the rubbing color fastness of the fabric:
according to the requirements of GB/T3920-.
The crocking fastness was assessed according to GB251-1995 Grey sample card for assessment of staining.
2. Testing the soaping color fastness of the fabric:
and (3) carrying out soaping color fastness test on the sample according to the requirements of GB/T3921.1-2008 'textile color fastness test and soaping color fastness'.
Soaping fastness was assessed according to GB250-1995 Grey sample card for assessing discoloration.
The control group used epression 1390 high-end pure cotton textile coating ink.
The results of the test on the printing fastness of the digital printing pigment ink prepared in the embodiment 1-5 of the invention are shown in the following table.
| Test sample | Colour fastness to rubbing | Color fastness to soaping |
| Example 1 | 4 | 4-5 |
| Example 2 | 4 | 4 |
| Example 3 | 3-4 | 4 |
| Example 4 | 3 | 3 |
| Example 5 | 3 | 2-3 |
| Control group | 4 | 4 |
From the results in the table above, it can be seen that: the inks of the embodiments 1-5 of the invention have good printing fastness, the effect is equivalent to that of similar imported inks, and especially the ink prepared by the embodiment 1 has the best performance.
To investigate the effect of the binder on the print fastness of the inks, the following test set was set up.
The ink is prepared by the test groups 1-7 according to the formula and the preparation method of the embodiment 1, the adhesive dosage of each test group is 1.2%, and then the printing fastness of each test group is tested.
The results of the digital printing pigment ink prepared by the test groups 1 to 7 are shown in the following table.
| Test sample | Colour fastness to rubbing | Color fastness to soaping |
| Test group 1 | 3 | 3-4 |
| Test group 2 | 4 | 4 |
| Test group 3 | 4 | 4-5 |
| Test group 4 | 3-4 | 4 |
| Test group 5 | 3 | 4 |
| Test group 6 | 1 | 1-2 |
| Test group 7 | 2 | 2-3 |
From the results in the table above, it can be seen that: the print fastness was the best for test 3, and was found after 2 and 4 tests, which indicated that the polyacrylate: when the butadiene copolymer is 2:1, the overall performance of the adhesive is best. The printing fastness of the test groups 1-5 is obviously superior to that of the test groups 6-7, which shows that the adhesive force of the adhesive is more obvious when the polyacrylate and the butadiene copolymer are used together.
To investigate the effect of the dispersing wetting agent on the dispersion and wetting effect of the inks, the following test set was set up.
The ink is prepared by the formula and the preparation method of the embodiment 1 according to the test groups 1-7, the consumption of the dispersing wetting agent of each test group is 2%, and then the dispersing wetting performance of each test group is tested.
Dispersibility: the mixture is placed at a constant temperature of 25 ℃ for 7 days, and the phenomena of layering, precipitation, flocculation and the like do not occur, so that the product is qualified; otherwise, the product is not qualified.
Wettability: the pigment was dispersed at a constant temperature of 25 c and the time taken for the pigment to disperse uniformly in each test group was tested, the shorter the time taken, indicating the better the wetting.
The results of the dispersion wetting test of the digital printing pigment inks prepared in test groups 1 to 7 are shown in the following table.
| Test group | Time taken for dispersion(s) | Dispersibility |
| Test group 1 | 3.5 | Qualified |
| Test group 2 | 2.9 | Qualified |
| Test group 3 | 3.2 | Qualified |
| Test group 4 | 3.8 | Qualified |
| Test group 5 | 9.1 | Fail to be qualified |
| Test group 6 | 12.5 | Fail to be qualified |
| Test group 7 | 6.3 | Qualified |
From the results in the table above, it can be seen that: the dispersion wettability was best for test 2, test 1 and 3 times, indicating sodium dodecyl sulfate: fatty alcohol polyoxyethylene ether: when the sodium lignosulfonate is 1:1:0.05, the dispersing and wetting agent has the best dispersing and wetting effect. The dispersing and wetting properties of the test groups 1-4 are obviously superior to those of the test groups 5-7, which shows that the dispersing and wetting agent has more obvious dispersing and wetting effects when the sodium dodecyl sulfate, the fatty alcohol-polyoxyethylene ether and the sodium lignosulfonate are used together.
To investigate the effect of the humectant on the water-retaining effect of the ink, the following test set was set.
The ink is prepared by the test groups 1-7 according to the formula and the preparation method of the embodiment 1, the humectant dosage of each test group is 10%, then the water retention performance of each test group is tested, and the water retention effect is evaluated according to the water volatilization rate, wherein the lower the water volatilization rate is, the better the water retention performance is.
The water content of the ink was measured under an environment of a constant temperature of 25 ℃ and a constant humidity of 50%, and the water content of the ink was measured after leaving for 7 days.
The water evaporation rate was [ (water content 7 days before 7 days)/water content 7 days before ] × 100%
The water evaporation rate of the digital printing pigment ink prepared by the test groups 1 to 7 is shown in the following table.
| Test group | Moisture volatilization Rate (%) |
| Test group 1 | 3.5 |
| Test group 2 | 2.3 |
| Test group 3 | 3.7 |
| Test group 4 | 4.5 |
| Test group 5 | 9.6 |
| Test group 6 | 11.2 |
| Test group 7 | 8.8 |
From the results in the table above, it can be seen that: test group 2 had the lowest water evaporation rate, test groups 1 and 3 times, indicating that sorbitol: potassium tripolyphosphate: when diethylene glycol is 1:1:0.3, the moisturizing effect of the moisturizing agent is best. The water evaporation rate of the test groups 1-4 is obviously lower than that of the test groups 5-7, which shows that the humectant has more remarkable moisturizing effect due to the compounding of sorbitol, potassium tripolyphosphate and diethylene glycol.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The digital printing pigment ink is characterized by comprising the following components in percentage by weight: 8 to 12 percent of nano organic pigment, 0.5 to 3 percent of dispersing wetting agent, 0.5 to 2 percent of adhesive, 5 to 15 percent of humectant, 0.1 to 1 percent of preservative, 5 to 10 percent of viscosity regulator, 0.1 to 1 percent of pH regulator and the balance of deionized water; the particle size of the nano-scale organic pigment is 50-100 nm; the dispersing and wetting agent comprises sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and sodium lignin sulfonate, and the sodium dodecyl sulfate comprises the following components in percentage by mass: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1 (0.01-0.1); the adhesive comprises polyacrylate and a butadiene copolymer, wherein the mass ratio of polyacrylate: 1 is a butadiene copolymer (1-3); the butadiene copolymer is selected from a copolymer of butadiene and styrene or/and a copolymer of butadiene and acrylonitrile; the humectant comprises sorbitol, potassium tripolyphosphate and diethylene glycol, and the mass ratio of sorbitol to the total mass of the humectant is as follows: potassium tripolyphosphate: diethylene glycol 1:1 (0.1 to 0.5).
2. The digital printing pigment ink according to claim 1, wherein in the dispersion wetting agent, sodium dodecyl sulfate: fatty alcohol polyoxyethylene ether: sodium lignosulfonate 1:1: 0.05.
3. The digital printing pigment ink according to claim 1, wherein the nanoscale organic pigment comprises at least one of permanent orange RN, gold red, benzidine yellow G, phthalocyanine blue, phthalocyanine red, phthalocyanine violet, permanent violet RL, pigment yellow 2GLT, permanent orange HSL.
4. The digital printing pigment ink according to claim 1, wherein in the binder, the weight ratio of polyacrylate: butadiene copolymer 2: 1.
5. The digital printing pigment ink according to claim 1, wherein in the humectant, sorbitol: potassium tripolyphosphate: diethylene glycol 1:1: 0.3.
6. The digital printing pigmented ink of claim 1 wherein the preservative comprises at least one of a sorbate ester, a 1, 2-benzisothiazolin-3-one, preservative YL 50.
7. The digital printing pigment ink according to claim 1, wherein the viscosity regulator comprises at least one of triethylene glycol methyl ether, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, and urea.
8. The digital printing pigmented ink of claim 1 wherein the pH adjuster comprises at least one of lactic acid, sodium hydroxide, citric acid, tris.
9. The method for preparing pigment ink for digital printing according to any one of claims 1 to 8, comprising the steps of: mixing the nanoscale organic pigment, the dispersing wetting agent and a proper amount of deionized water, heating to 55-65 ℃, uniformly stirring, then adding the adhesive, the humectant, the preservative, the viscosity regulator, the pH regulator and the balance of deionized water, uniformly stirring, keeping the temperature for 10-20 min, and discharging to obtain the digital printing pigment ink.
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| CN113047061A (en) * | 2021-03-18 | 2021-06-29 | 常州喜莱维纺织科技有限公司 | Ultra-low viscosity color pigment and preparation method and application thereof |
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Application publication date: 20210219 |