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DOWSIL™ 2405 Resin

A reactive alkoxy-siloxane resin used as binder that provides heat resistance and improves the physical performance of paints and coatings for high temperature resistance applications. The material can be moisture-cured at room temperature without the presence of tin catalyst.

Benefits:

  • Room temperature curing without tin catalyst
  • High heat resistance (i.e. 650°C with black and aluminum pigments)
  • Improved flexibility and impact resistance
  • Solventless delivery
  • Low smoke generation on initial heating
  • Compatible with pure methyl methoxy and traditional phenyl silicone resins

Properties

These values are not intended for use in preparing specifications.

Typical Properties

  • Benefit Yes No High Temperature Coatings
  • Color Yes No Clear
  • Cure Type Yes No Alkoxy Cure
  • Residual Silicone Dioxide Yes No 77.9 ww%
  • Shelf Life Yes No 720 Days
  • Solventless Yes No true
  • Specific Gravity @ 25°C Yes No 1.11
  • System Yes No Solvent Borne
  • Temperature Stable Yes No High
  • Viscosity at 25ºC Yes No 100 to 300 Centistokes

Achieve improved flexibility in high-temperature-resistant, room-temperature-curing coatings

  • Paint formulators are under pressure to deliver more-sustainable coatings. This is reflected in the demand for lower-temperature – and hence lower-energy – curing systems. This is especially relevant to formulators of high-temperature-resistant coatings, which usually require high curing temperatures.
  • Traditional solutions have been methyl methoxy resins, but these suffer from stress due to their high-crosslink-density curing, which limits flexibility and film build.
  • With DOWSIL™ 2405 Resin, formulators have an option to significantly extend the formulating space for room-temperature-curing, high-temperature-resistant coatings.

Room temperature cure

  • When catalyzed with TnBT or other catalysts, DOWSIL™ 2405 Resin cures within 60 minutes at ambient temperature (20°C) to form a medium-hard coating.
  • Some traditional phenyl resins, such as DOWSIL™ RSN-0806 Resin, physically dry to provide high hardness (Figure 1). However, they do not exhibit good cure, and they have little or no solvent resistance.
  • In contrast, methyl methoxy resins, such as DOWSIL™ 2405 Resin, provide medium hardness but very good solvent resistance.

Improved flexibility/impact resistance

  • For selected substrates and where film thickness can be controlled, formulators can create very fast-curing systems using methyl methoxy resins such DOWSIL™ US-CF 2403 Resin. However, the high crosslink density associated with these resins can result in films that are brittle and have poor impact resistance, causing many formulators to avoid using them.
  • With DOWSIL™ 2405 Resin, the cure rate is reduced slightly, but the flexibility and impact resistance are significantly improved (Figure 2). Formulators can blend DOWSIL™ 2405 Resin and DOWSIL™ US-CF 2403 Resin in any ratio to optimize some hardness and cure rate.

Figure 2. Flexibility limitations of room-temperature-curing resin

Graph: Flexibility limitations of room-temperature-curing resin

Solventless delivery with good build/viscosity

  • The very low molecular weight of methyl methoxy resins can lead to difficulties in the formulation of easy-to-spray products with good build per coat. However, with the slight increase in molecular weight of DOWSIL™ 2405 Resin, formulators have more formulation options to achieve good build with less risk of sags/runs.
  • Plus, with its solventless delivery, DOWSIL™ 2405 Resin may be used for high-solids formulations (and low VOC).

Tin-free curing

  • DOWSIL™ 2405 Resin is catalyzed by titanium compounds (such as TnBT) or other hydrolysis catalysts, and does not require the use of tin catalysts.

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DOWSIL™ 2405 Resin
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DOWSIL™ 2405 Resin
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