CH-5     hyperdispersants

Benefits:  

1.Higher pigment loading in the millbase, shorter milling time, lower processing energy, greater productivity.

2.Much lower resin content in the millbase, wider application range of the millbase.

3. Higher dispersing stability, no aggregation, no deposition and no separation of pigment.

4.Better tinctorial effect, higher brightness, transparence and color strength.

5.Better levelling and gloss.  

Application Range:  

For pigments dispersed in offset ink / publication gravure ink and iron-printing ink, for flushed colors, too.

Dosage:  

2-5% based on the dry weight of inorganic pigment, 5-10% of the dry weight of organic pigment or carbon black.  

Usage:

1.For offset ink application  

     (1) Simplified method:

    Add measured CH-5 into the millbase, stir them thoroughly, then, add the pigment to mill together. More pigment can be added because CH-5 can reduce the viscosity of the system.

     (2) Recommended method:

Reduce the resin content of the millbase to 30-40%, use as less binding material as possible in the millbase. Binding material may be added later to the finished product. Because CH-5 can reduce the viscosity of the system, much more binding material may be added, at the same time, the pigment concentration may be higher, the solvent may be less, so the properties of the ink may be better.

     Examples:

(1) varnish formulation: 15phr modified phenol formaldehyde resin, 15phr alkyd resin, 10phr petroleum resin and 60phr aliphatic solvent

(2) millbase formulation: 26phr varnish, 8phr alkyd resin, 10phr petroleum distillation, 2phr anti-oxidant and 4phr CH-5 are stirred thoroughly, then gradually add 50phr Lithol Rubine pigment to grind together to produce red millbase; 33phr varnish, 5phr alkyd resin, 6phr petroleum distillation, 2phr anti-oxidant and 4phr CH-5 are stirred thoroughly, then gradually add 50phr Lithol Rubine pigment to grind  to produce black millbase.

(3) let-down formulation: 20phr modified phenol formaldehyde resin, 28phr active petroleum resin, 18phr soya-bean oil modified alkyd resin, 2phr adhesive and 40phr petroleum distillation to produce heatset let-down; 24phr modified maleic resin, 20phr lilic oil modified alkyd resin, 2phr adhesive and 30phr petroleum distillation to produce sheetfed let-down varnish.

(4) final ink formulation: 35phr red millbase, 51phr let-down, 7phr polyvinyl wax and 7phr aliphatic solvent to make final offset red  ink; 35phr carbon black millbase, 51phr let-down, 8phr polyvinyl wax, 8phr aliphatic solvent and 5phr alkalic blue to make final offset red ink.

2.For publication gravure ink & iron-printing ink application

    (1) Simplified method:

   Add measured CH-5 into the millbase, stir them thoroughly, then add the pigment to mill together. More pigment can be added, because CH-5 can reduce the viscosity of the system.

    (2)Recommended method:

   Add measured CH-5 into the millbase which contains 10% resin, stir them thoroughly, then add pigment to mill together. More pigment can be added because CH-5 can reduce the viscosity of the system. The millbase can be applied to more versatile uses because of less resin content.

   Following is some typical millbase formulations for reference:

  pigment               % pigment      % 10% resin solution     %  CH-5

Lithol Red DR 1839LB        35             62.2                  2.8

Lithol Rubine 4576            45             52.3                  2.7

Irgalite Red LGN             25              72.5                  2.5

Lutetia Rubine BLS461        45              51.4                  3.6

3.For flushed colors application

   The use of CH-5 hyperdispersants in flushed colors manufacturing process can reduce the time required to obtain a ‘clear break’. The time and energy needed to dry the flushed colors is also greatly reduced. The flushed color is more versatile, it may be used in heatset, sheetfed or news-printing inks.

   Because CH-5 can facilitate the transferation of the pigment from the aqueous presscake to the non-aqueous vehicle, CH-5 should be added to the presscake with heavy stirring so that it can wet-out the pigment and render more hydrophobic flushed colors.

   The amount of CH-5 required in the flushing process depends on the surface area of the pigment, but as a general guide, a level of 5-7% based on dry pigment weight is a useful starting point.

   Red flush manufacture example:

        10phr CH-5 is mixed with 500phr presscake contained Lutetia Rubine BLS461 for 5 minutes, then add 160phr flushing vehicle (which contains 30%petrolatum, 15% urethanated alkyd, 33% natural hydrocarbon resin, 22% modified phenolic resin) and keep stirring until the onset of the clear break. Let out the water and remove the residual water, add 35phr flushing vehicle and 10phr CH-5, mix thoroughly to obtain red flush with pigment content higher than 50%.

Remarks: 

The above is a two–charge example. The use of three breaks is also very common – in this case no CH-5 should be added to the third break, or the amount specified in the second charge can be split with the third charge.