Hyperdispersant for offset printing
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The commonly used hyperdispersant for offset inks is 17000, 18000, and 19,000, which are very low in the unfolding chain. Some 17000 and similar products on the domestic market are actually 17,000 xylene or white ore with a content of about 40%. Oil solution.
The 17000 series is an amine-anchored hyperdispersant. According to the above pigment-dispersant matching principle, the organic pigment molecule contains a trace amount of carboxyl or sulfonic acid groups, which will facilitate the dispersion of organic pigments in the offset ink system. The specific methods that can be used for each major species are:
A. benzidine yellow:
(1) The rosin derivative provides an acidic surface, such as rosin-511 produced by Zhenjiang Tianlong, which is widely used by major companies around the world for the surface treatment of benzidine yellow. What needs to be explained here is that many pigment manufacturers in China use hydrogenated rosin or disproportionated rosin for the production of benzidine yellow, which is very dangerous because hydrogenation or disproportionated rosin-coated benzidine yellow is in the drying or storage process. The middle pole is easy to catch fire, and many major fire accidents have occurred at home and abroad, causing huge economic losses. In order to prevent fire accidents, some pigment factories are forced to add a large amount of antioxidants or flame retardants in the pigment production process, which reduces the risk of fire to some extent, but increases the production cost and the obtained benzidine. The quality of yellow is debatable, and in many systems pigments containing antioxidants or flame retardants cannot be used.
Figures 4 and 5 are the differential thermal analysis spectra of rosin-511 and domestic disproportionated rosin, respectively. It can be seen that the initial decomposition temperature of rosin-511 is more than 60 °C than that of domestic disproportionate. This may be the reason why pigments using disproportionated rosin are prone to fire.
In order to further improve the fluidity of benzidine yellow, some pigment manufacturers use rosin-511 in combination with the use of hyperdispersant 18000. In fact, this is not necessary, which is only a means for ink manufacturers to transfer costs.
(2) Co-coupling is carried out using a sulfonic acid group-containing DCB derivative to impart a weak acidity to the surface of the benzidine yellow.
(3) Adding a benzidine yellow derivative capable of providing weak acidity, such as the multiplying agent Tilo-22000. In fact, this is not necessary, and it is just a method of cost transfer in the ink factory.
B.PR57:1 and other lake-like organic pigments:
Due to the relatively high surface polarity of these pigments, the dispersant is easily adsorbed on its surface, in addition to the proper amount of additives such as iso- 4B acid, toluic acid, T required to ensure crystal integrity adjustment and hue adjustment. In addition to -500 and T-510, it is not necessary to add a hyperdispersant. However, there are still many pigment manufacturers adding Tilo-3000 or Tilo-17000 in the production process to obtain the so-called Baohong, which is fluid and dispersible in offset ink. This is also a game to transfer the cost of the ink factory to The pigment factory only.
C. Blue 15:3:
For offset inks, blue 15:3 can be added with no more than 5% of rosin derivatives to impart a suitable weak acidity to the surface of the pigment, which facilitates the firm bonding with the hyperdispersant Tilo-17000 or the like during ink polishing. Or add the multiplier Tilo-5000 to protect
Proof of low viscosity requirements in offset printing systems. As mentioned above, the Tilo-5000 should also be something that the ink factory adds itself.