Pigment pastes

Of the models Hsted in Table 1, the Newtonian is the simplest. It fits water, solvents, and many polymer solutions over a wide strain rate range. The plastic or Bingham body model predicts constant plastic viscosity above a yield stress. This model works for a number of dispersions, including some pigment pastes. Yield stress, Tq, and plastic (Bingham) viscosity, = (t — Tq )/7, may be determined from the intercept and the slope beyond the intercept, respectively, of a shear stress vs shear rate plot. 

PVC spread-coating pastes are normally manufactured in high-speed planetary mixers that can be evacuated. It is best to add the plasticizer first, stir in the pigments or pigment pastes and only then to add the solid components in portions. In pigmenting plasticized PVC compounds, on the other hand, it is necessary to mix... 

In a spray dryer, the aqueous pigment paste passes through a rotating disk or nozzle into a cone-shaped spray chamber fed with hot air. The dried pigment powder trickles through a grate at the bottom. 

Soaking and de-greasing agents Dispersants for pigment pastes... 

Also, the choice of solvents in pigment pastes and suspensions depends very much on the printing technology and ink formulation. Preferred solvents are... 

PAINT is a mixture of pigment and a binder. GUM AHABIC is a X)pular water based binder, used to make WATERCOLORS, or, with an opaciher such as chalk added, GOUACHE. Crush pieces of gum arabic to a fine powder, add twice their volume of hot water, stir to dissolve. To reduce brittieness add a small amount of candy sugar. Mix 1 part gum arabic soultion with 2 parts pigment paste in water (all parts are by volume). 

M ix this yolk with equal parts of water or white wine vinegar, for use with pigment paste. GLAIR is made with egg white and is ideal for delicate illumination work on parchment. Beat egg white until the foam is dry. The liquid at the bottom of the vessel is glair. 

ASTM D 185-95. Coarse particles in pigments, pastes, and paints. 

The client has asked for a recommended formulation for a luxurious soap bar, based solely on vegetable fats (Figure 9.2). A high-quality palm-coconut base that is widely available in Europe should be suitable, but it was felt that such a premium product should contain some additional materials to convey added value . Thus, a powdered cationic polymer is incorporated, which deposits a moisturizing film on the skin and helps to promote a rich, creamy lather. Titanium dioxide, a standard additive to any soap, provides greater opacity (and, to some extent, whiteness) to the bar and a variety of pigment pastes, which are... 

Akrosperse . [Aktochem] Pigment pastes, accelerator, vulcanizer in masterbatch form for synthetic elastomers. 

BASF ADudi Blue . [BASF AG] Cone, pigment pastes with tripbenylmedume p menis fix inks, typewriter ribbon inks, carbon paper. 

Holcoplast [Holland Colours UK] Plas-tkizer/pigment pastes. 

Laropal . [BASF AG] Aldehyde and ketone resins lightfast resins for surface coatings, pigment pastes, flexo-gnq)hic and gravure inks. 

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