Applications Applications Applications Applications

Curatives Applications

Polyurea

What it is:

Polyurea is an elastomer formed by the rapid reaction of isocyanates with polyamines. It cures extremely fast, without the need for catalysts, and develops excellent toughness, elongation, and chemical resistance.

Applications and Uses:

  • Protective coatings (pipelines, tanks, flooring, roofs)
  • Waterproofing and corrosion protection
  • Spray elastomers for automotive and industrial uses
  • High-performance linings for abrasion and impact resistance

How it is Produced:

Polyurea is synthesized by combining isocyanates (aromatic or aliphatic) with diamine curatives or chain extenders. The reaction is moisture tolerant and applied mainly through spray techniques.

The Role of Dorf Ketal Curatives:

  • Clearlink® 1000/1080: Aliphatic diamine chain extenders that improve UV stability, toughness, and heat resistance in polyurea coatings.
  • Unilink® aromatic diamines: Provide curing at ambient temperatures with improved adhesion and finish for elastomeric coatings.

Recommended Products:

Product
Function
Key Benefits
Clearlink® 1000
Aliphatic diamine chain extender
Tough, UV-stable polyurea; improved strength & heat resistance
Clearlink® 1080
Aliphatic diamine chain extender
Durable, UV-stable; low moisture sensitivity; slower reactivity
Unilink® Aromatic Diamines
Chain extender
Ambient cure; improved adhesion and finish

Polyurethane

What it is:

Polyurethanes are versatile polymers formed by the reaction of isocyanates with polyols, often modified by chain extenders and catalysts. They can be flexible, rigid, or elastomeric depending on formulation.

Applications and Uses:

  • Flexible and rigid foams (insulation, cushioning, automotive seats)
  • Coatings and adhesives
  • Elastomers (rollers, wheels, seals)
  • Sealants and binders

How it is Produced:

Polyurethanes are produced by combining diisocyanates (MDI, TDI, etc.) with polyether or polyester polyols. The use of catalysts and chain extenders controls the cure rate, mechanical properties, and processing window.

The Role of Dorf Ketal Curatives:

  • Unilink® 1000 Series: Zirconium-based catalysts, fast curing similar to tin, ideal for cast elastomers.
  • Unilink® 2000 Series: Titanium-based catalysts, delayed cure similar to mercury, offering broad formulating window.
  • Clearlink® 1000/1080: Chain extenders that enhance toughness and UV resistance.
  • Tyzor® catalysts: Effective curing agents and tin-free alternatives for polyurethane adhesives and sealants.

Recommended Products:

Product
Function
Key Benefits
Unilink® 1000 Series
Polyurethane catalyst
Fast cure, high productivity, tin replacement
Unilink® 2000 Series
Polyurethane catalyst
Delayed cure, mercury replacement, tailored properties
Clearlink® 1000/1080
Chain extender
Strength, UV stability, improved compatibility
Tyzor® 9000, AA series
Catalyst
Moderate to fast cure, environmentally responsible

Epoxy

What it is:

Epoxies are thermosetting polymers formed by the reaction of epoxide groups with curing agents (amines, anhydrides, or organometallic compounds). They are known for strong adhesion, chemical resistance, and dimensional stability.

Applications and Uses:

  • Structural adhesives and sealants
  • Protective and decorative coatings
  • Electrical insulation and composites
  • Flooring, aerospace, and automotive components

How it is Produced:

Epoxy resins are typically synthesized from bisphenol A (BPA) and epichlorohydrin. They are cured using hardeners or catalysts, which determine final mechanical and thermal properties.

The Role of Dorf Ketal Curatives:

  • Tyzor® AA series: Provide moderate to fast curing and good resistance.
  • Tyzor® 9000: Fast reactive catalyst with low impact on color.
  • These organometallic catalysts serve as effective curing agents, enhancing processing speed and final performance.

Recommended Products:

Product
Function
Key Benefits
Tyzor® AA Series
Epoxy curing agent
Moderate to fast cure, resistant, color control
Tyzor® 9000
Epoxy curing agent
Fast cure, low color impact
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