Silicone resin emulsions

A silicone resin emulsion product designed to impart durable water repellency when suitably applied and cured to various fabrics. The recommended CATALYST SL Cone, to be used in the application of RANEOFF S. 

Silicone resin emulsion for water-repellent finishes. 

Silicone resin emulsions. With the aid of suitable emulsifiers and stabilisers, insoluble silicone resins can be converted into water-soluble emulsions and can be diluted with water. Such emulsions are used as water-repellent additives for plaster or silicate emulsion paints as well as for the surface treatment of mineral powders such as perlite, aerated concrete granules, and so on. 

It is well known that organosilicon compounds do not become equally well attached to all mineral substrates. While silicates always readily lend themselves to coating with silane and polysiloxane [19-21], the same cannot always be said of calcium carbonate [19, 20]. Calcium carbonate (calcite), a widely used filler, is generally considered difficult to cover with silanes. Given the proven, good attachment of silicone resin to calcium carbonate fillers in silicone resin emulsion paints [2, 22], the question arises as to whether only higher polymeric siloxanes are able to form hydrophobic protective coatings on calcium carbonate. 

The fact that mineral-paint-like silicone resin emulsion paints, which have veiy open pores yet... 

The binders used for silicone resin emulsion paints [16] are almost exclusively methylsilicone resins, R-SiOsa (R = CH3), in combination with an organic polymer binder. Aqueous silicone resin emulsions predominate. As a solvent-free solution cannot be produced from a solid resin, high-viscosity silanes/siloxanes/silicone resin mixtures are used that differ initially from the solid resin in the degree of polymerization. 

The paint samples were prepared from a high-grade silicone resin emulsion paint [48] with a binder ratio of 10 wt% styrene acrylate to 10 wt% silicone resin emulsion (both 50% solids). The coatings were applied to a mineral substrate and dried at room temperature. Part of each sample was etched for a few minutes in 10% nitric acid so that the organic polymer could be visualized better. 

Silicone resin emulsion paints always contain two binders, i.e. some of the organic polymer binder in the emulsion paint is replaced by silicone resin. Silicone resin emulsion paints are predominantly formulated at high PVC (pigment volume concentration > 60%), as a result of which the overall binder content is low. The PVC is a theoretical description of the volume fraction of the... 

Theory Behind Silicone Resin Emulsion Paint... 

Fig. 2. Highly simplified model of the microstructure of a silicone resin emulsion paint.

The microstructure of a silicone resin emulsion paint is shown in Fig. 3. The overview even at low magnification (Fig. 3a) indicates that one binder forms thick films (black arrows) into which sinks some of the approx. 300-nm-sized white pigment (titanium dioxide). This is the organic polymeric binder. Because of the deficit of organic polymer, pore voids are open and voids between fillers are only partly filled (Fig. 3c), i.e., only small adhesive bridges are present (black arrows in Figs. 3a,c), which determine the binding power. 

Fig. 4. SE images of organic polymer binders (a, b) in the primaiy form as dispersion and (c, d) coalesced in silicone resin coatings, a, b Typical particle shape of the primaiy latex particles after rapid diying in a vacuum, c, d Plaster/paint samples etched with 10% HNO3. c Plan view of a coalesced polymer binder of a silicone resin plaster and d cross-section of of a polymer film partly covering a clay mineral particle within a silicone resin emulsion paint.

Vinac 828M binder, iotions Propylene glycol alginate binder, iow-emission waii paints Lipaton AE 3723 Styrene/n-butylacrylate/ acrylic acid/acrylamide copolymer binder, iow-VOC coatings Silicone Resin Emulsion BS 43A Silres MP42E... 

GP-179 Silicone Resin. See Polydimethylsiloxane GP-209 Silicone Polyol Copolymer, GP-215 Silicone Polyol Copolymer, GP-217 Silicone Polyol Copolymer. See Dimethicone copolyol GP-223 Silicone Resin Emulsion. See Polydimethylsiloxane GP-226 Silicone Polyol Copolymer. See... 

Foam-Eater [Coastal Chem. Corp] GP-179 Silicone Resin [Genesee Polymers http //www.gpcsilicones.com], GP-223 Silicone Resin Emulsion [Genesee Polymers http //www.gpcsiiicones.com], GP-616 Silicone Fluid [Genesee Polymers http //www.gpcsiiicones.com], HTH Spa Defoamer f[Arch Chems./HTH Water Prods.] Masil EM 100 [BASF/Perf. Chems. http //www.basf.com/businesses/chemicais/per formance]-, Masil EM 100 Cone. [BASF/Perf. Chems. 

Silicone Release Agent 5038. See Dimethicone Silicone Resin Emulsion BS 43A. See Polydimethylsiloxane Silicone rubber. See Silicone elastomer Silicone Systems 820, Silicone Systems 872, Silicone Systems 873, Silicone Systems 876 Silicone Systems 878, Silicone Systems 882 Silicone Systems 883, Silicone Systems 886] Silicone Systems 889] Silicone Systems 921] Silicone Systems 922] Silicone Systems 923] Silicone Systems 924] Silicone Systems 925] Silicone Systems 972] Silicone Systems 972P, Silicone Systems 976 Silicone Systems 982] Silicone Systems 982P] Silicone Systems 983] Silicone Systems 984] isilicone Systems 986. See Silicone... 

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