In order to ensure the product status of water-based ink in the printing process and the quality of the final product, in addition to selecting the appropriate water-based ink resin, it is also necessary to add related additives in water-based ink to ensure the stability of the ink, the commonly used additives in water-based ink are mainly pH stabilizers, defoamer, fast drying agent and slow drying agent.

1.pH stabilizer pH stabilizer is mainly used to adjust the pH value of ink. The pH value problem of ink painting, through the ink manufacturers to promote ink products to printing companies is often mentioned, low pH value is easy to cause ink caking, if the pH value is high, its viscosity is relatively low. In general, the change of ink pH value should be detected in the printing process, when the pH value is lower than 8, an appropriate amount of pH stabilizer should be added, so that the ink can maintain a good printing state. The pH value of ink in European countries is neutral as the standard, when the pH value is adjusted at 8.5, its fluidity and gloss reach the best state, but in the printing process (within 1 hour) due to the volatilization of amine solvents, the viscosity of ink will increase rapidly, the gloss will decrease, the fluidity will become worse, and there will be a large number of unqualified products, such as adjusting the pH value, the need to add amine solvents. And in the printing process (within 1 hour) to carry out continuous testing (with acidity meter), a little careless, waste will appear, and the whole workshop is full of bad smell, such products in the printability is considered bad, such as ink pH value between 7 and 8, ink stability is the best, the user can add pure water as a solvent to reduce viscosity, This will not increase the cost, but also reduce the resin taste of the ink.

2. Defoamer: printing speed is fast and printing technicians add too much water, which is easy to produce bubbles. When the bubble is relatively large, the phenomenon of printing white and inking amount is small, which seriously affects the printing quality. It is generally recommended to add two kinds of foam inhibitor and surface defoamer in ink and wash to solve the foaming phenomenon, and the proportion of use is 1 ~ 2%.

3. Fast drying agent: ink in the process of use due to the different resin selected by the ink manufacturer or the machine speed is too fast, may cause the ink drying speed is slow. The accelerated drying agent can adjust the ink drying speed to meet the requirements of the printing machine speed, improve production efficiency, and its use ratio is 2 ~ 3%.

4. Slow drying agent: Slow drying agent can inhibit and slow down the drying speed of ink, play a moisturizing role, prevent the ink from drying on the plate or the roller, reduce the occurrence of printing failures such as blocking plate and paste plate, and the proportion of use is between 1 and 2%.

5. Diluent: under the premise of constant pH value and viscosity, adding diluent can reduce the color concentration of a certain ink. The dosage should be determined according to the specific circumstances.

6. Diluent: Adding diluent to ink can reduce the viscosity of thickened water-based ink without affecting the pH value. The amount must not exceed 5% of the total ink volume.

7. Enhancer: Enhancer can enhance the adhesion of printing ink or gloss oil to the substrate material, and its dosage is generally 1 to 2% of the total ink amount.

8. Electrostatic agent: electrostatic agent can effectively prevent the accumulation of static electricity on the printing machine, and its dosage is generally 0.5~1% of the total ink amount.