1.
Main Products & Applications:
SKYSPERSE/SKYJET pigment dispersion pastes are the mixing concentrates
achieved from dissolving the chips in form of either free flowing pourable
liquids or high viscosity pastes.
SKYSPERSE pigment pastes may be easily incorporated into letdown
varnishes to produce high quality of printing inks.
SKYSPERSE pigment pastes are snack colors for the ink and coating
applications and can be used in producing the excellent quality of printing
inks, paints and coatings. Besides, they will reduce the production time, labor
cost, and provide more flexibility in formulation and production.
2.
Incorporation Of Pigmented Pastes:
A high shear mixing equipments is necessary for its optimum efficiency.
The same technique is recommended for both the semi-liquid dispersion and paste
dispersion during letdown and incorporation. Proper letdown technique is
critical when using a dispersion in order to avoid pigment reagglomeration. The
major reason of pigment reagglomeration are because of incompatibility or
pigment shock which can result when the pigment concentration is quickly
reduced in viscosity or introduced into a vehicle system improperly.
The best solution is to reduce the pigment dispersion with small
amounts of total vehicle system under good agitation. This should be done until
the viscosity of paste appromimates the viscosity of base vehicle system. When
this is reached, the dispersion can be added to the vehicle system at a steady
rate until the dispersion becomes fully incorporated. This should be done under
good agitation with full movement in the tank. After the incorporation is
complete, total system should be mixed thoroughly to guarantee a homogeneous
mixture.
Special care should be paid if the solvents alone are used for
dispersion reduction. It is recommended to use most active solvent first. If
this cannot be done, a mixture of the total solvent blend should be used. A
non-solvent or diluents should never be used alone.
3.
Basic Rules Of Letdown
⑴Do not add
materials with big different viscosities.
⑵The viscosity of
the pigment dispersion and the vehicle based should be approximately the same
to avoid physical shock..
⑶Make additions
always under good agitation.
⑷Letdown vehicle
should be a mixture of solvents and resin.
⑸If using solvents
alone, always use the most active solvent fist or a mixture of the total
solvent system.
⑹Never add
non-solvents or diluents alone.