Guangzhou Silok New Materials / Silok Silicone Additives, Prepolymers and Dispersions

Selection and quotation of Silok materials: leveling agents, wetting agents, defoamers and dispersants, slip agents, silicone prepolymers and waterborne silicone PU and acrylic dispersions.

Silok 8244, 350 and 333 Leveling Agents

Modified polysiloxane leveling agents for UV, waterborne and solvent-based varnishes, paints and inks. Silok 8244 with a higher molecular weight gives mirror leveling and resistance to oil stains, while Silok 350 and Silok 333 give quick leveling without craters and orange peel.

8244: 1000–5000 cps viscosity
8244: 0.35% in PU wood finish
350: 0.5–2.0% in UV film paint
333: 0.1–0.3% in baking paint

Silok 8000 and 8066 Substrate Wetting Agents

Polyether modified polysiloxane wetting agents lower surface tension and wet metal, plastic and other low-energy substrates. Silok 8000 has low foam stability, while Silok 8066 resists plasticizer migration and is intended for water based PU coatings on PVC substrates.

8000: down to 19.6 dyne at 1%
8000: 10–100 cP viscosity
8066: 20.0 ± 2.0 mN/m
8066: 1.0–2.0% in PVC coatings

Silok 4016 Defoamer for Solvent-Based Systems

Silok 4016 is a defoamer made of modified silicone and silicon dioxide for solvent-based and UV systems. It knocks down and suppresses foam at a very small dosage, allows full recoating and does not affect leveling or gloss, so it suits both finish and substrate paints.

4016: 0.2% in epoxy floor paint
4016: 0.1–0.3% in gravure ink
4016: 1.0% in UV and silk screen ink
4016: 0.1–0.5% in epoxy adhesive

Silok 7066 Universal Wetting and Dispersing Agent

Silok 7066 is a light color dispersant of the polycarboxylic acid ester block polymer type, mainly for titanium dioxide and other inorganic powders. It wets and disperses pigments and fillers in solvent-based, solvent-free, water-based and UV systems with stable color paste.

7066: acid value 173
7066: 500–1500 cP viscosity
7066: 95.00 ± 3.00% solids
7066: carbon black and matting powder

Silok 87, 351 and 51M Slip and Abrasion Agents

Silok 87 and Silok 351 are polyether modified polysiloxanes that reduce the friction coefficient and improve slip and abrasion resistance of UV varnishes and printing inks. Silok 51M is a modified silicone oil emulsion for water-based coatings, inks and leather finishing.

87: 0.3–0.8% in UV paper gloss
351: 300–800 cP viscosity
351: 0.3–2.0% in UV printing ink
51M: 2.0–5.0% in water-based leather

Silok 8815 Silicone Prepolymers for PU Synthesis

Silok 8815 is a silicone prepolymer with two hydroxyl groups and reactivity similar to polyols: it copolymerizes with NCO groups when synthesizing silicone modified PU resins, emulsions and Si-TPU. The range also lists carboxyl, epoxy-based, amino and vinyl silicone prepolymers.

8815: AMW 1750
8815: 30–100 cP viscosity
8815: anti-abrasion for resin and coating
8815: two-component PU baking paint

Silok 1087R3, 1090R2 and 1486R Silicone PU Dispersions

Waterborne polyurethane dispersions with high silicone content for leather finishing, textile and paper coatings. Silok 1087R3 is miscible with all types of waterborne resins in any ratio, Silok 1090R2 gives a velvety matte feel, and Silok 1486R self-crosslinks without a curing agent.

1087R3: 83% silicon-based content
1090R2: silicone is 70% of solids
1486R: 980% elongation at break
1486R: 19 N/mm tear strength

Silok 1899R and 1052R Silicone Acrylic Dispersions

Silok 1899R is a silane-modified hydroxy acrylic dispersion used together with a curing agent: the coating is hydrophobic, oleophobic and easy to clean. Silok 1052R is a silicone-PU modified acrylate emulsion without organic solvents that forms a transparent elastic film.

1899R: 4% hydroxyl content
1899R: 360 days storage stability
1052R: 50 ± 2% solids
1052R: 800 dry and wet wipe cycles

Additive Dosage by Coating Type

The manufacturer gives additive levels by weight of the coating. Silok 8244 is added at 0.35% to gloss and matt PU wood finishes and at 0.5–1.0% to UV wood floor varnish, Silok 350 at 0.5–2.0% to UV film paint, and Silok 333 at 0.1–0.3% to baking paint and PU varnish.

The Silok 4016 defoamer is dosed at 0.2% in epoxy floor paint, 0.1–0.3% in gravure ink and 1.0% in UV and silk screen ink. The Silok 51M abrasion resistance emulsion is added at 2.0–5.0% to water-based leather surfaces and textile coatings.

Wetting Agent or Leveling Agent: Choosing by Surface Tension

Silok 8000 lowers surface tension to 19.6 dyne at 1% concentration and wets metal, plastic and other low-energy substrates with low foam stability.

Silok 8066 with a static surface tension of 20.0 ± 2.0 mN/m resists plasticizer migration and is intended for water based PU coatings on PVC (1.0–2.0%) and PU leather finishing (0.5–2.0%).

For mirror leveling and resistance to oil stains the choice is Silok 8244, and for quick leveling with good substrate wetting it is Silok 350.

Silicone in Polyurethane: Prepolymer or Ready Dispersion

Silok 8815 is a prepolymer with two hydroxyl groups and an AMW of 1750: its reactivity is similar to polyols and it copolymerizes with NCO groups. It is used to synthesize silicone modified PU resins, PU emulsions and Si-TPU, improving wear resistance and preventing adhesion, fouling and graffiti.

Without in-house synthesis, ready dispersions are used: Silok 1087R3 with 83% silicon-based content is miscible with waterborne resins in any ratio, and Silok 1486R self-crosslinks without a curing agent and reaches 980% elongation at break.

Waterborne Silicone Acrylic Binders

Silok 1899R is a silane-modified hydroxy acrylic dispersion with 4% hydroxyl content that is used together with a curing agent. The coating is hydrophobic and oleophobic, oil pen marks are wiped off with 75% ethanol without damaging the film, and storage stability is 360 days.

It is applied to wood grain paper coatings, architectural coatings and glass coatings. Silok 1052R is a silicone-PU modified acrylate emulsion without organic solvents with 50 ± 2% solids: the film withstands 800 dry and wet wipe cycles without degumming.

Guangzhou Silok New Materials / Silok and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Guangzhou Silok New Materials / Silok and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.