With the rising voices of environmental protection in various countries, the current printing factories in various countries are facing a lot of "green pressure."

New vegetable oil ink

To change the printability of vegetable oil inks, the chemistry of the solvent (vegetable oil) must first be changed. In Europe there has been a new vegetable fat derived from the reaction of fatty acids obtained with soybean oil or linseed oil with alcohols (methanol, ethanol and isobutanol). This vegetable fat has the same ink printing properties as mineral oil. Its viscosity ranges from 3 to 15 mPa • s at 23 ° C, very close to mineral oil, allowing it to easily penetrate into the paper, greatly increasing ink retention. The same amount of solvent made with this vegetable fat and mineral solvent were placed in a 150 �?span> oven and found that the volatilization rate of the two is almost the same. At the same time, the improved vegetable fat has a greater ability to dissolve the resin than mineral oil, taking into account the rate of fixation, gloss and good ink-to-water balance, all of which make vegetable oil a superior alternative to mineral oil.

At present, this new type of vegetable oil cannot completely replace the mineral oil directly as a solvent, but it can replace a considerable amount of mineral oil in the ink solvent, accounting for 40% to 50% of the amount of solvent.

New ink application characteristics

1. Printability

Compared with mineral oil ink, the same amount of water, vegetable oil ink agile reaction to water, stop water viscosity steady, rapid recovery. Vegetable oil ink on the water intake speed, absorption is limited. In contrast, mineral oil inks showed a steady decline in viscosity, stop adding water, ink on water detachment slow and there is fluctuation. Printing with vegetable oil inks can effectively prevent over emulsification, density fluctuations and water bars and other failures.

2. Fixing speed

Due to their low viscosity, vegetable oil inks adhere quickly and quickly on all coated papers, whether on high-speed or low-speed presses. The use of mineral oil ink, even with the dusting, fixing speed and vegetable oil ink, usually takes 1 hour.

3. Wear resistances

Oftentimes newspaper readers are often dirty with ink sticky black when reading. This is because the ink on the substrate after printing with conventional ink can easily be erased. Vegetable oil ink can be a good solution to this problem. Its wear resistance is better than mineral oil, because the fatty acid ester in vegetable oil contains unsaturated bond, the ink is easily oxidized and conjunctiva after it is printed on the material, so that the ink is firmly fixed on the printing material. The mineral oil on the contrary, its chemical stability, there will be no reaction, it is difficult to conjunctiva.

4. Printing ink

Because vegetable oil inks can show a thicker and brighter color effect, you can save ink, reduce printing costs, and increase unit yields by 10% to 15%.

5 light fastness, heat resistance

Vegetable oil ink boiling point is much higher than the volatile components of oil, when the laser printer or copier heating, will not be volatile and stick to the paper, it will not pollute the machine parts.

6. The double-sided printing characteristic

Because of this new vegetable oil has particularly good stability, solubility, non-volatile and moderate viscosity characteristics, which is particularly suitable for double-sided printing. In the printing process, the just-printed side should immediately flip the roller contact with the back, in order to prevent printing graphics stick to the roller, ink fixing speed neither too fast, nor in the end of the printing caused by rub dirty. However, this new solvent system can provide many effects.

7. Environmental performance

Vegetable oil does not contain organic volatile aromatic polycyclic hydrocarbons and other harmful substances, is non-toxic solvents, is conducive to human health and prevent air pollution.

In addition, it has been found that vegetable oil ink is easier to de-inked and has less fiber loss than conventional mineral oil in the recovery of waste paper, and the deinked waste ink is more likely to degrade compared to mineral oil inks (since most plant oils decompose spontaneously, Can be decomposed, while the petroleum distillate material does not work), this feature is very beneficial for waste paper recycling and drainage.