Offset ink formulation

Formula 1

Components

Dosage/g

Components

Dosage/g

Carbon black

200

Thermal Polymer Oil

100

Basic Lantona

100

Light oil

25

Rosin modified phenolic resin

450

Cobalt naphthenate solution (metal containing 6%)

5

Oil-in-water droplet emulsion

120

Description The formulation of the oil-in-water drop type emulsion consists of 30% alkyd resin and 70% plate cleaner. The preparation process is as follows.

Alkyd resin 231 g linseed oil, 14 g pentaerythritol, 8 g propylene glycol, 0.12 g citronella in a reactor, stirred under a nitrogen gas flow at a long temperature to 250 °C for transesterification 90 min, the temperature dropped to 200 °C 50 g of isophthalic acid was added The temperature was raised to 250°C and the ester exchanged for 50 minutes to obtain an alkyd resin.

The plate cleansing solution dissolved 7.7 g of gum arabic in 46 g of water, adjusted to color with contaminated red paper with hydrochloric acid, stirred at 40-50° C. for 6 hours, and slowly dripped 120 g of ethanol aqueous solution (95%) to precipitate arabinonic acid. Vacuum filtration to take precipitate heated to 90 ° C arabinose, dissolved in 90g of water to get the layout of the liquid.

Oil-in-water Dripping Emulsion 140g of plate cleaner was added to 60g of alkyd resin at 50°C and stirred for 30min to obtain a water-in-oil-drop type emulsion.

Ink preparation The components in the formula (except the oil-in-water drop-type emulsion) were mixed to make a paste dispersion and then added to the oil-in-water droplet emulsion. The total amount reached 1000 g. The mixture was mixed with a strong mixer to evenly distribute it in the ink connecting material. That is, offset printing ink.

Formula 2

Components

Dosage/g

Components

Dosage/g

Î’-type phthalocyanine blue

150

Light oil

30

Hydrophobic barium sulfate

150

Oil-in-water droplet emulsion

100

Rosin modified phenolic resin

550

Description The oil-in-water drop type emulsion is prepared from a 50% water-resistant alkyd resin and a 50% plate cleaner. The preparation process is as follows.

1 Water resistant alkyd golf ball Dali should be charged 231g, glycerine 19g and turpentine 0.15g into the reactor, make it stirred in a nitrogen stream, heated to 250 °C, at this temperature for transesterification 30min, cooled to 200 After the temperature was increased, 50 g of isophthalic acid was added, and the temperature was raised to 250°C. After the ester exchange at this temperature for 5 hours, an alkyd resin was prepared, and then after cooling to 150°C, 6 g of aluminum octylate and 24 g of light oil were added at 150°C. After the temperature was increased, 6g of aluminum caprylate and 24g of light oil were stirred at 150°C for 30 min to obtain a water-resistant alkyd resin.

2 Layout Cleaner Gum arabic gum 8.6g, phosphoric acid 2.2g, ammonium alum 16g and not 113.2g are mixed. When preparing the water-in-oil emulsion, take the water-resistant alkyd resin first, and then slowly add the plateau clear liquid at 50°C, stir After 20 minutes Serve.

3 Prepare high-band offset inks First mix β-type phthalocyanine blue, hydrophobic barium sulphate, rosin-modified phenolic resin, virgin water and light oil, and prepare a pigment dispersion paste. Then combine 100 parts of the water-in-oil emulsion. When mixed in a powerful dispersion stirrer, the plate cleaner is evenly dispersed in the ink binder, which results in an ink with excellent storage stability. With his printing on high-speed offset printing, no ink brush marks are produced.

Source: 21st Century Fine Network