Alkyd Resins

Alkyd Resins

Alkyd resins have been the leading coating resin since the early 1900’s.  Most are solvent-borne.  The basic chemistry is the reaction of vegetable oils, polyols, and polyacids.  Alkyd resins can be engineered to have a wide range of processing and performance characteristics.


Short Oil Alkyd Resins

Short oil alkyd resins are the fastest drying of the unmodified alkyds.  The drying rate is efficient for OEM products and high volume manufacturing.  They dry too fast for brush application enamels. They feature a good combination of hardness, flexibility, and abrasion and chemical resistance.

Typical applications:

  • Industrial, fast-dry enamels
  • Industrial baking enamels
  • Metal primers
  • Traffic paint
  • Drum coatings
  • Aerosol paints and coatings
  • Clear wood finishes
  • Industrial wood primers

Short oil alkyd resins are often cross-linked with melamine or urea, may be air cured or baked. They are excellent for industrial coatings with aromatic or oxygenated solvents.

Short oil alkyds typically have less than 40% oil content.

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Medium Oil Alkyd Resins

Medium oil alkyds dry faster than long oil alkyds.  The solvents are typically aliphatic or oxygenated. These resins have good durability and gloss retention.  They are excellent for high gloss coatings and wood finishes.

Typical applications:

  • Exterior enamels
  • Traffic paints
  • Floor enamels
  • Furniture finishes
  • Industrial enamels and primers

Medium oil alkyds typically have 40%-to-55% oil content.

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Long Oil Alkyd Resins

Long oil alkyds are the standard resins for oil-based architectural paints and deck coatings.  They offer many excellent properties to coatings: durability, flexibility, and gloss retention.  They also offer application benefits:  brushing ease, fast dry, and compatibility with a range of solvents and other coating resins.

Typical applications:

  • Architectural and decorative enamels
  • Trim and trellis paints
  • Marine paints
  • Metal primers
  • Pigment dispersions

Long oil alkyds typically have more than 55% oil content.

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Vinyl Toluene-Modified Alkyd Resins

Vinyl toluene modification improves several properties in alkyd resins:  solubility with aliphatic and oxygenated solvents; drying speed; substrate wetting; hardness; and resistance to acid, caustic, and moisture.  The compatibility with lower-MIR solvents is ideal for aerosols. The compatibility provides industrial coating properties to indoor paints and primers. Variety of solvents and solids levels provides formulating convenience.

Typical applications:

  • Tough, flexible coatings
  • Aerosol paints and coatings
  • Industrial and maintenance coatings
  • Sanding sealers

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Silicone-Modified Alkyd Resins

Silicone modification enhances critical properties of alkyd resins to produce coatings with higher temperature tolerance and improved toughness, durability, and weather resistance.

Silicone-modified alkyd resins are typically blended with other alkyd resins for industrial and maintenance coatings in demanding applications.

Typical applications:

  • High temperature alkyd coatings
  • Industrial and maintenance coatings

Urethane-Modified Alkyd Resins, Uralkyds

Solvent-borne polyurethane-modified alkyd resins complement the ease of alkyds with the toughness of polyurethanes.  Uralkyds provide abrasion, wear, and chip resistance to enamel paints for both indoor and outdoor applications.  They also blend and improve long-oil alkyd coatings.

Typical applications:

  • Clear wood varnishes
  • Floor paints
  • Clear sports floor coatings
  • Industrial primers and finishes
  • Inks
  • OEM finishes
  • Decorative exterior coatings

Coconut Oil Alkyds, Non-Drying Alkyd Resins

Coconut oil is a non-drying oil used in short-oil and medium-oil alkyds where crystal clarity and low color are required.

Coconut alkyds can be the principal resin in wood finish coatings or a component in enamels and lacquers.  They are widely used a plasticizers and modifiers with other resins.  They are compatible with epoxy, melamine formaldehyde, urea formaldehyde, vinyl, and alkyd resins.

Non-HAPS coconut alkyds include such solvents as n-butyl acetate, isobutyl acetate, ethanol and isopropyl alcohol.

Typical applications:

  • OEM factory applied wood coatings
  • Low VOC baking enamels

Rosin Modified Alkyds

Rosin modification imparts hardness and air-dry speed to medium-oil and short-oil alkyds.

Typical applications:

  • Dark industrial baking enamels
  • Primers
  • Top-coat enamels
  • Pigment grinding vehicles

Alkyd Resins for Pigment Grinding and Dispersions

High-solids alkyd resins provide excellent vehicles for pigments and additives concentrates.  High acid value alkyds are effective dispersants and grinding aids.  Hydrocarbon-modified alkyd resins are effective aluminum vehicles for interior and exterior coatings.


Alkyd Resins in Low-HAPS Solvents and with Low-VOC

Deltech Resin Company produces high-solids alkyd resins, aerosol resins compatible with low-MIR solvent and propellant systems, and resins in such solvents as OXSOL 100TM Parachlorobenzotrifluoride, butyl acetate, PM acetate, dimethyl carbonate (DMC), and custom solvents and solvent blends.


Water-Reducible Alkyd Resin

Water-reducible alkyd resins are typically chain-stopped resins for air-dry and forced air-dry industrial enamel coatings.  These alkyd resins have high acid values and high solid levels in water-miscible solvents for further neutralization with amines and for dilution with water.  The resins produce low-VOC coatings with longer drying time and similar gloss, flow, and leveling to solvent-borne coatings.

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Alkyd Resin Dispersions

Water-dispersions of alkyd resins are VOC-free (solvent-free) alkyd resins. Specialty surfactants produce stable dispersions that are easier to use than water-reducible alkyd resins.

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Chain-Stopped Alkyd Resins

Chain-stopped short-oil alkyd resins have tight control on the molecular weight of the resin and produce coatings with improved durability. They are an alternative to short-oil alkyd resins for coatings that require shorter tack-free time.

Typical applications:

  • Top coats and primers for air dry, force dry, or bake
  • Low bake enamels
  • General purpose air dry coatings
  • Spray and dip coatings

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