Water Based Acrylic Ink

Product Details

Product Features

Water based acrylic ink is a high performance soft film styrene acrylic copolymer emulsion, which is specially designed for water based printing ink. Hazardous substances or substances such as lead, chromium, mercury and chromium alloys are within the standard range. This product has good adhesion, water resistance and wear resistance; Good ink transfer and printing adaptability; It has good compatibility with aqueous resin, ethanol, isopropanol and others. It is suitable for flexographic and gravure printing. The water based ink used for preparation has high gloss and bright color.

1. Water based, safe

2. It has good adhesion with corona PET film

3. Good color development, stable ink color and good gloss

4. Excellent printability and printing stability

5. Water resistance, heat resistance, scratch resistance and wear resistance

Characteristic

Good film forming toughness, fast drying speed, good scrub resistance and adhesion, good ink transfer and printability. Good color development of pigment, high gloss and good printing stability.

Technical Indicators

Appearance: translucent light yellow liquid

pH: 8.5-9.5

Solid content: 20-50%

Ionic: anionic

Viscosity: 10-25 (seconds/chai 4# cups)

Particle diameter: 10 µ M

Application 

Paper ink, corrugated paper or cardboard ink, water based flexographic ink, water based gravure ink

Water based acrylic ink is made of pigment, water-soluble resin,water and related additives through compound grinding and dispersion processing. Because it replaces the original benzene and other organic solvents with water, it greatly reduces the emission of organic volatile matter (VOC). It is safe and environmentally friendly. It is recognized as an environmentally friendly printing material in the world, especially suitable for the packaging and printing of food, beverage, medicine and other products.

Among the resins for water based ink, acrylic resin has become one of the best choices for water based acrylic ink because of its diversity and good physical and chemical properties. water based acrylic ink not only has the advantages of resin such as excellent hardness, gloss, acid and alkali resistance, good weather resistance and pollution resistance, but also has the characteristics of low price, safe use, energy saving, reducing environmental pollution and public hazards.

Causes and solutions of failure of water based acrylic ink

1. Incorrect hue. The drillability of water based acrylic ink is too low or the pigment content in the ink system is small or there is deviation in color purity. The ink precipitates and transfers poorly during printing. Add the original ink, adjust the drilling degree, mix the ink evenly before printing, and check whether the printing plate and ink roller are aging.

2. Unstable viscosity. Ink has thixotropy, foaming and volatile solvent. The ink shall be stirred evenly and then added with an appropriate amount of defoamer (0.2%) and an appropriate amount of solvent to achieve the balance of volatility.

3. Poor dryness. The imprinting will not dry or even stick to your hands within the expected time. High ink drillability, poor drying, poor absorption of base paper or plastic and fabric. Dilute the ink, adjust the printing pressure, increase the blowing or drying temperature, or use fast drying ink Or adjust the dryness. Replace the substrate and replace the light version.

4. The contour is blurred. The high-profile part of the print is blurred False dot and tone loss. The quality of the printing plate is not high, the contact between the printing plate and the ink roller is too tight, the ink drilling is large, the ink returns to coarse, the ink dries too fast and the mixing is poor. The backing plate shall be even and flat, the printing pressure shall be adjusted, the water and alcohol shall be mixed, the ink shall be stirred reasonably, and the ventilation device shall be adjusted. Do not blow on the ink roller And increase the machine speed, scrub with water containing monoethanolamine or add 0.2% dimethyl silicone oil or increase the proportion of coupling agent.

5. The image and text crush the ink out of the image and text. The quality f of the printing plate is too soft or the elasticity of the backing plate is too large, the contact pressure is too tight, the ink privacy is too low, and the ink mixing is poor. Pad the plate, adjust the height of the printing plate, adjust the printing pressure or manual silk screen printing scraper pressure, adjust the drilling degree to water ink with high drilling degree, or exchange ink with higher hardness and stir ink reasonably.

6. Poor transfer. The printing pressure is insufficient, the hardness of the printing plate is too high, the water resistance of the paper is too strong, and the ink roller is worn and aged. Increase printing pressure, use hydrophobic ink to check the wear and aging of ink roller, and add tm-20. Coupling agent Replace the blocked and worn metal anilox roller.

7. It is difficult to overprint, and multi-color overprint is not allowed. The printing pressure of the first color ink is too high, and the first color ink dries too fast. The second color printing shall be emphasized, and the first color printing shall be light. Add an appropriate amount of tm-200s coupling agent to reduce the privacy of the first color ink and adjust the dryness of the first color ink or print the second color (overcoming the surface vitrification) when the ink film is not completely dry. The printing plate swells and bulges and deforms, and replace the paper.

8. ink bubbles, ink bubbles in ink fountain after printing ink. The foam inhibitor of the ink system is poor, the ink circulation is insufficient, the water is too large, the pump circulation is too large, the pipe leaks, and the ink is too thin. Add defoamer properly (0.2%, preferably mix the internal and external plasticized defoamers) to reduce the circulation of the pump and add new ink so that it does not dilute the inspection pipe too much to prevent air leakage.

9. Chemical pinhole. Add too much defoamer, the ink is diluted too much, and the ink with low privacy is inked too much. Note that about 0.2% defoamer is added. It should be mixed with the original ink and stirred well before printing.

10. The printing plate is worn. The contact is too tight, the printing pressure is too heavy, or the texture of the printing plate is too hard. Adjust the contact, adjust the printing pressure, replace the printing plate or add 3mm plastic foam to the back of the plate.

11. Ink gelatinization. Use the wrong solvent (some active molecules begin to associate to form micelle sized aggregates). Mixed with other kinds of ink, improper storage, wrong colorant in the ink, and the ink ages for a long time. Use solvent with good solubility, add about 2% silica gel or 0.3% tm-200 coupling agent, seal and store, and properly f add auxiliary agent with activity.

12. Paste dirty / sticking dirty during printing and stacking dirty after printing. The film is peeled due to friction on the transfer rod, resulting in dirt. The ink drying speed is too slow, the printing speed is too fast, the ventilation is improper, and the ink is too soft. Replace the hard ink and add fast volatile solvent (ethanol or acetone) to slow down the printing speed and increase the air supply.

13. Ink fading the color of ink fades during printing or stacking. The ink system filler grabs too much color and has wrong pigment use (acid and alkali resistance). The printing carrier is too acidic Ink pigments are not heat-resistant. Use quick drying ink or use less drying agent. The pigment in the ink adopts stable pigment with heat and light resistance, and replace calcium filler that does not capture color. Add inorganic mica powder or anti ultraviolet absorbent or antioxidant about 0.1% - 0.3%.

14. Striped orange peel with uneven imprint. The ink leveling is too poor, the plasticizer is excessive, and the thixotropy is too large. Sometimes there are mesh stains, the paper is uneven, the ink drill is too large, the printing pressure is too large, the ink is too thin, and the water is too large. Replace the thicker ink, reduce the printing pressure, and replace the ink with good water resistance Use opaque ink Change the high-quality substrate with uniform surface and increase the filling amount (such as talc powder can not only prevent sedimentation but also improve leveling). Replace the ink with low viscosity. Do not dilute the color too light to reduce static electricity.

15. The imprint falls off (pulverization). Printed matter after binding, moving or hand erasing Ink contaminates prints and fingers. Due to improper adjustment of the ink, the resin in the printing ink system is reduced or the solubility of the solvent and binder in the ink system is unbalanced, resulting in poor wetting of pigments and fillers, too rough paper surface or too smooth aluminum and plastic surface. Increase the resin content, reduce the proportion of water, and balance the content and solubility as much as possible.

16. Poor patience. Poor water resistance, light resistance, wear resistance and alkali resistance. Use appropriate ink. After the solid ink film is formed, its pH value should be controlled between 7 and 7.5! Replace the light resistant ink or add 0.2% UV absorber or inorganic mica powder. Use soft ink.

17. Net blocking and plate blocking. There is a large f accumulation of ink residue at both ends of the ink roller. The pigments and fillers in the ink system are neutralized and accumulated due to non alkali resistant binder. The ink is mixed with paper scraps, plastic scraps and fabric scraps. Reduce the printing pressure, filter the ink and adjust the ink supply Alkali resistant pigments, fillers and alkaline active additives are selected, and the raw ink with appropriate viscosity is added to the printed ink for mediation.

Some materials added to improve ink performance in printing or water based acrylic ink formula. Also known as auxiliary agent and additive.

Common ink additives include driers, diluents, tackifiers, thinners, antioxidants, degumming agents, defoamers, surfactants, pinhole inhibitors, smoothing agents, plasticizers, preservatives and spices.

Desiccant

Additive added to the ink prepared with dry vegetable oil to accelerate the drying of ink conjunctiva. Also known as desiccant. Dry oil, dry oil for short. The common inorganic acid is boric acid. Various metal driers have their own unique effects.

Diluent

It is used to dilute the color of ink, but basically does not change the viscosity, rheology and printability of ink. Where four-color water based acrylic ink is not yet popular, lithographic ink still adopts six colors, i.e. red, yellow, blue and black. In addition, it is also necessary to print "little red" and "little blue" to adjust the hierarchical tone. This kind of ink is prepared by adding diluent to red and blue base ink respectively. Therefore, diluent is a large amount of auxiliary agent in the ink in 2018.

The diluent of oil ink is generally transparent oil and white oil, while the diluent of resin ink is different from the above.

Viscosity reducer

An additive used to reduce the viscosity of ink without affecting the ink body. Also known as adhesive remover. In the process of lithography and relief printing, due to the poor combination of paper fibers, insufficient water resistance, poor surface coating of paper, excessive viscosity of ink, too many driers, low temperature in the printing workshop and other reasons, the phenomenon of paper fuzzing occurs, resulting in the emergence of defects such as stacking and pasting. At this time, properly adding viscosity reducer can overcome the problem of paper fuzzing. The amount is generally 3 ~ 5% of the amount of ink.

Diluent

An additive used to reduce the viscosity of ink and increase the fluidity of ink. In the printing process, due to the excessive viscosity of ink and poor paper quality, there are phenomena such as paper roughening and plate dropping. In this case, in addition to reducing the viscosity of the ink with a viscosity reducer, a thinner must sometimes be added.

Antioxidant

Commonly known as anti drying agent, anti scaling agent and anti drying agent. When some dry oils and some inorganic pigments such as lead chrome yellow and iron blue are used in the formulation of water based acrylic ink, these materials are easy to produce oxidative polymerization or have the effect of promoting drying, resulting in ink scaling during storage, sometimes even dry and can not be used; In the printing process, the oxidized conjunctiva drying ink also crusts and dries on the machine due to long shutdown time. In order to overcome these problems, an appropriate amount of antioxidants can be added to this kind of ink to delay the oxidative polymerization of dry oil.

Degumming agent

When the ink is stored, its viscosity sometimes increases continuously, and accelerates with the increase of ambient temperature. It gradually hardens and can not even be used. This phenomenon is called ink gelation. Adding 5 ~ 10% anti gelling agent to the gelled ink can sometimes overcome the gelling phenomenon and make the ink available immediately. Most of the degumming agents are refined by dissolving calcium turpentine (acid value is about 65) or maleic anhydride resin with high acid value in flaxseed oil.

Defoamer

It is mainly used in thin ink. Most of these inks can be transported by pump. When scraping off from the plate (such as photocopying ink) or flowing down from the roller (such as flexible relief ink) in the printing process, air is mixed into them due to the impact between inks, resulting in bubbles. Aromatic type, alcohol type and water type inks all have this phenomenon, and water type is the most serious.

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