Application of RFNC resin free color paste in oil modified organic silicon coatings

Document number: DENSON-TDS-RFNC-Silicone-2025

With the advancement of kitchenware and appliance manufacturing, surface treatments now require enhanced environmental sustainability and improved heat and scrub resistance. High-performance oil-modified silicone coatings have gained widespread adoption due to their exceptional chemical resistance, high-temperature tolerance, and non-toxic properties. However, achieving coloration through inherent resin compatibility remains a critical yet challenging process. Traditional resin-based pigments often suffer from compatibility issues that lead to floating colors, mottling, uneven gloss, and ultimately compromised heat resistance and mechanical performance of the coatings.

Tissot's RFNC (Resin-Free Nano Color) series of resin-free color paste provides excellent color matching solutions for modified silicone coating systems with its innovative resin-free carrier nano dispersion technology.

At present, polyester modified silicone (silicon content 70%) with curing condition 280℃ 10 minutes, epoxy modified silicone coating, alkyd modified silicone coating have been tested

I. Core Product Advantages: Unmatched Compatibility. The RFNC color paste's core lies in its "super dispersion formula" and "resin-free" system. It eliminates carrier resins that might compete with silicone resins, consisting solely of high-performance superdispersants, refined pigments, and eco-friendly solvents. This structure delivers near universal compatibility.

Mechanism of compatibility

1. No competition solidification: avoid interference between carrier resin in color paste and silicone resin in coating during cross-linking curing process.

2. Space steric stability: The use of high efficiency polymer super dispersant and multi-anchors and multi-chains anchoring groups can make pigment particles remain stable in the coating system for a long time and not easy to flocculate through the space steric effect.

3. Solvent System Compatibility: The carefully selected eco-friendly polyester solvent system demonstrates excellent compatibility with most modified silicone resins, ensuring optimal initial wetting and long-term storage stability of the pigment paste. Free from benzene and quinoline, this formulation demonstrates strong market foresightability to meet increasingly stringent requirements in future markets.

II. Compatibility coverage with various modified silicone resins

The RFNC color paste has been verified by a large number of applications and shows excellent compatibility with the following typical types of modified silicone resins.

1, epoxy modified silicone:

Wacker® SILIKOPHEN series, Ying Chu P50 P80/X P1000, Shin-Etsu Chemical KR-520X series,

Excellent compatibility. No flocculation or gelation after system mixing, uniform coating gloss, no floating color or blooming. (Applied in ovens, incinerators, pipelines)

2. Polyester modified silicone:

Wacker® SILRES® MPF Series, Allnex® Specific Resin, Mito, Nagasaki, Miki, Shinetsu

Excellent. No effect on the hydroxyl and carboxyl groups of resin, strong color display, good leveling. (Applied in non-stick pan coating engine internal coating)

3. Acrylic modified silicone:

In Shinetsu and Nagakusho of Japan, certain models are excellent. The wide compatibility window does not affect the light retention and weather resistance of acrylic chain segments. (Applied in outdoor steel structures and automotive parts)

III. Excellent heat resistance

The core value of modified silicone coatings lies in their high-temperature resistance. RFNC color paste maximizes the retention and enhancement of this performance. Selected pigments: The high-performance organic pigments in the RFNC series demonstrate exceptional thermal stability (typically withstand temperatures ranging from 240°C to 290°C, depending on pigment type).

No resin decomposition: because the color paste itself does not contain any carrier resin which will decompose, carbonize or change color at high temperature, the coating is more stable in color under high temperature environment, and will not bubble, crack or change color due to the thermal weight loss of the color paste components.

Synergistic effect: the stable pigment dispersion system and the inorganic-organic hybrid network of silicone resin work together to maintain the integrity and appearance of the coating after long-term thermal aging.

IV. Environmental protection and food contact safety

The product contains no heavy metals and complies with EU regulatory requirements under EN71-3-19. It is free from alkylphenol polyoxyethylene ether (APEO) and meets EU REACH, SVHC, and other regulatory standards. Low VOC: Utilizing eco-friendly solvents helps reduce overall VOC emissions in the coating system. Food contact application potential: RFNC pigment paste provides formulations compliant with FDA and/or EU framework regulations (EC) No 1935/2004 for coatings used in food processing equipment, cookware, and similar applications. (Note: The final coating's overall compliance must be evaluated and certified by formulation engineers through full system assessment, with results verified by qualified third-party testing. These pigment paste examples are case studies for reference only and do not guarantee complete regulatory compliance.) The resin-free RFNC system reduces potential migration of 

small-molecule organic compounds, establishing a robust foundation for relevant certifications.

V. Application guidance and suggestions

Recommended application: The recommended dosage ranges from 4% to 10% of the total paint weight, with specific amounts depending on desired color depth and coverage. For light color systems, the dosage may be appropriately increased. To ensure optimal dispersion and distribution, it is recommended to mix the pigment slurry with 1:1 solvents of matching formula type before application.

Storage: Store in a cool, dry place, out of direct sunlight. The shelf life is usually 12 months.

6、The following varieties are recommended for oil modified silicone coatings cured at high temperature

Yellow: RFNC-8225 8227T 8229 8229T

Red: RFNC-8380T 8367 8377T 8322T

Orange: RFNC-8373

Blue: RFNC-8650 RFNC-8653 RFNC-8655

Green: RFNC-8607

Purple: RFNC-8523T

Black: RFNC-1006