Knowde Enhanced TDS
Identification & Functionality
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Applications & Uses
- Applications
- Coating Type
- Application
SILIKAL® R 71 resin (SILIKAL® R 71 re resin) is employed primarily as a colorless, scratch-resistant top coat for decorative colored flakes and colored sand surfaces. Compared with SILIKAL® R 71 resin, SILIKAL® R 71 re resin is characterized by a reduced blue fraction. SILIKAL® R 81 resin must be used for surfaces which are used wet in the food industry.
- Advice on Application
Once moderately sized batches (5 - 10 kg) have been mixed with the necessary quantity of hardener as laid down in the “Hardener dosages” table, the resin is immediately poured onto the surface and applied crosswise, preferably by means of a paint roller. Although it is possible to spread it roughly with a rubber blade first, the dwell time of the still liquid resin until final leveling on a colored flake surface must not be too long, as this may partly dissolve and leave color tracks behind. To ensure the best possible properties, the minimum and maximum coating thickness must be observed. Material consumption for smooth coatings is approx. 400 g/m² per application and on areas sprinkled with SILIKAL® Filler QS 0.7 - 1.2 mm approx. 500 g/m². If the coating thickness is exceeded (more than 800 g/m² ), the resin will tend to flake and yellow. If the thickness is too low, excessively high monomer loss may occur, leading to insufficient hardness or lower resistance. Under braking strains the thermoplastic character of the surface may lead to tire marks which in many cases can be removed again using suitable cleaning agents. It makes sense for the user to protect the surface against damage through careful use and care. In many cases it would be advisable to ensure that fork-lift trucks are driven appropriately, black tires are exchanged for white ones and/or a surface care agent (e. g. SILIKAL® Protect) is used.
Special Advice: Hard top coats must never be applied directly on very elastic coatings, e. g. SILIKAL® RV 368 or R 61 HW resin. In these cases a moderately elasticized intermediate coat made from SILIKAL® R 61, R 62 or R 81 resin must be applied, as otherwise movement caused by temperature will lead to hairline cracks forming in the top coat.
Pigmenting: Pigmenting is possible, but SILIKAL® R 72 has better properties in this regard. If pigmentation is nevertheless essential, 10 % pbw. of SILIKAL® Pigment Powder is usually added. To avoid lumps in the pigment, it must first be dispersed with the same quantity of resin by means of a dissolver to eliminate lumps. After the dispersion process, the residual quantity of resin is added to the new pigment paste until the total content of the mix is again 10 %. You must make particularly sure that pigments which are not made by Silikal are properly tested for their compatibility and storage stability.
- Suggested Coating System
- Colorless top coat
- Pigmented top coat
- Hardener Dosages
Temperature Hardening Powder (% pbw.*) Pot life (approx. min.) Hardening time (approx. min.)
-5°C 5 25 60 0°C 4 17 40 10°C 3 15 30 20°C 2 15 30 30°C 1 8 15 * The quantity of hardening powder is always related to the quantity of resin.
Properties
- Resin Properties
| Value | Units | Test Method / Conditions | |
| Viscosity (20°C) | approx. 60 - 80 | mPa.s | DIN 53 015 |
| Flow Time (20°C, 4 mm Cup) | 18 - 21 | sec. | ISO 2431 |
| Density (D₄²⁰) | 0.99 | g/cm³ | DIN 51 757 |
| Flash Point | 10.0 | °C | DIN 51 755 |
| Pot Life (20°C, 100 g, 3 % pbw. Hardening Powder) | approx. 15 min. | — | — |
| Application Temperature | -5 to 35 | °C | — |
| Density (Hardened state) | 1.18 | g/cm³ | DIN 53 479 |
| Ultimate Elongation (Hardened state) | 4.0 | % | DIN 53 455 |
| Hardness (Hardened state) | 70 - 80 | Shore-D | DIN 53 505 |
| Water Absorption (4 Days, Hardened State, 50·50·4 mm) | 125.0 | mg | DIN 53 495 |
| Water Vapour Permeability (Hardened state) | 1.05*10⁻¹¹ | g/cm·h·Pa | DIN 53 122 |