Wetting and Dispersing Additives

Silicone-free defoamers based on other incompatible polymers (e.g., acrylates and acrylic copolymers) are also commercially available. 

Commercial products include Agitan (Miinzing) Airex, Foamex (Tego) BYK-024, -052, -066 (Byk) Colloid 681F (Colloids) Dehydran, Foamasier, Nopco (Henkel) Disparlon OX-710 (Kusumoto) Dapro (Daniel) and Drewplus L-475 (Drew). 

A) Benard cells B) Rub-out test performed on the lower part of the panel 

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Auxiliary agents flow control additives, wetting and dispersing additives, antifloating additives... 

Many additives can be incorporated relatively easily into the paint system during or after the last phase of production (let down). In some cases, however (e.g., with many rheological additives), certain incorporation conditions have to be observed. Wetting and dispersing additives, for example, always have to be present in the mill-base to achieve the desired results. 

To allow ATH filler loads above 100 phr specially designed fillers are neeessary. Unfortunately, fine fillers have very large surface areas ftat makes wetting quite diffieult even with specific wetting and dispersing additives. However, judicious blending can prepare filler loads up to 300 phr with acceptable viscosities for moulding and pultrusion, for instance, with resins like dicyclopentadiene or modified methyl methacrylates. 

BYK Wetting and Dispersing Additives for Homogenization, Stabilization and Fiber wetting in Polyester Holding Compounds and Pultrusion. 

Uses Wetting and dispersing additive for fiiiers and pigments in PVC piastisois, fiiiersurf. treatments, prod, of masterbatches DOP-free provides iowervisc., higher ioadings, better coior deveiopment Properties Lt. brn. vise, iiq., aicohoiic odor insoi. in water sp.gr. 1.07 dens. 8.83 Ib/gal acid no. 85 flash pt. (PMCC) > 110 C ref index 1.468 100% act. 

Uses Wetting and dispersing additive for Ti02, ZnO, CaCOj, and azodicarbon-amide pastes in plasticizers for prod, of chemically foamed PVC piastisois promotes more uniform and smaller cell structure improves long-term color stability Properties Colorless Iiq., alcoholic odor sol, in water sp.gr. 1.02 dens. 8.43 Ib/gal ... 

Chem. Descrip. Higher m.w. unsaturated polycarboxylic acid Uses Wetting and dispersion additive to prevent flooding produces selective flocculation of pigments and extenders, stabilizes pigment dispersion for binder systems such as alkyds, acrylate polymers, chlorinated polymers, polyester/ melamine polyisocyanate systems... 

Uses Wetting and dispersion additive for solv.-based paints deflocculant Properties Sp.gr. 0.93 g/cc flash pt. 25 C 50 1% act. in xylene/diisobutyl ketone (4 1)... 

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