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Surface Finishing Tutorial

#174 Paint Types - 2

Category : Painting
December 6, 2013

(3) Alkyd resin paint

Alkyd resin paints are room temperature drying paints with alkyd resin which is based on substrates of polybasic acids such as phthalic anhydride and polyhydric alcohol (glycerin, etc.) ester modified with various oils or fatty acids as the main coating component.
For the purpose of improving the paint suitability, it may be modified with rosin, phenolic resins, silicone resins, epoxy resins, styrene monomer. Theses are called Modified Alkyd Resin Paints, and unmodified ones are called Oil Modified Alkyd Resin Paints or Pure Alkyd Resin Paints.
The characteristics of this type of paints are: [1] Strong coatings, good adhesion, good weatherability, [2] Good pigment dispersion thus good color, luster, color retention, [3] good density, [4] good water resistance, solvent resistance, heat resistance, [5] easy to use and economical, etc.
They are used in large quantities in all areas and dominates the field of practical use paints along with Amino Alkyd Paints mentioned next. They are used for construction applications (interior and exterior painting, construction materials, steel structure, equipment, etc.), marine vessels, automobiles, metal painting (large electrical appliances, machine and tools, farm implementation, etc.), and home use.

(4) Amino alkyd resin paint

Amino alkyd resin paints are baked paints with mixtures of alkyd resin and amino resin as the main coating component. For amino resin, butylated melamine or urea resin are widely used. During the baking process, the hardened coating is formed by OH group of alkyd resin and CH2OH group of amino resin making ether bonding.
The property of amino alkyd resin paints vary with the component resin types, mixture ratio, and baking conditions. For instance, the higher the resin concentration and baking temperature, the higher the coating crosslink density, hardness, chemical resistance will be.
The general characteristics of this type of paint are as shown below.
[1] Low temperature, short time baking are possible, [2] coating is hard and glossy, [3] little discoloration, good weatherability and chemical resistance, [4] good wear resistance and electrical property, flame resistant. As a shortcoming, if anything, they are not as good in adhesion and alkali resistance compared to epoxy, vinyl, acrylic resin paints.
They are widely used on applications, other than in-field paintings, as under and over coatings that can be baked on construction materials (sash, surface treated steel plates, etc.), automobiles, electrical material, machinery, metal furniture, office equipment, and other metal products.

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