Name given to composite material group obtained by mixing unsaturated polyester resin with fiber, sand etc. to improve mechanical strength. Fiber reinforced polyesters (also called FRP or Glass) are the most widely used unsaturated polyester based composites.

Castor oil derivatives

Castor oil derivatives, having tendencies to establish hydrogen bonds with the binders over their OH groups, provide the coating with a thixotropic structure. Sensitivity to high temperatures applied during paint production can be noted as their weakness.

Drying time

Time period required to reach the desired drying level after application, is defined as the drying time. Depending on the drying level, various drying times can be mentioned such as dust-free drying time, dry-to-touch time, dry-to-assembly time, dry-to-stack time and chemical drying time etc.

Moisture curing polyurea coatings

See Moisture curing coatings

Moisture curing polyurethane coatings

Despite the fact that, polyurea is formed from the reaction of isocyanate with moisture in the air, coatings composed of polyurea is commonly misnamed as “moisture curing polyurethane coatings”.

Polyurethane resins

See Urethane resins

Paint production using monopigmented pigment pastes

In this paint production approach, a resin with a high compatibility range is selected as main dispersion resin and different pigments are dispersed separately to a certain grain size using this resin. Color matching is performed using this pigment pastes and letdown is done by adding remaining ingredients after a proper calculation. The main advantages of this approach are, better optimization of capacity of production equipment (especially the mills) and storage areas in addition to reduced production times. It is achieved by producing common pigment pastes, which can be used in various product groups owing to the compatible resin used. The drawback of this approach is the difficulties in sensitive color matching because of highly concentrated pigment pastes in addition to the possibility of decrease in color strength, gloss as well as haze and formation of particles due to pigment flocculation during storage.

Urea

Compound produced by reaction of liquid CO2 with ammonia and used in the synthesis of urea formaldehyde resin.
Melting point: 132-136°C

Urea formaldehyde resins

Polymerization product of urea and formaldehyde. Commonly used as adhesives. In addition, they are used as cross-linker in alkyd and polyester baking systems.

Urethane modified resins

Resins that have alkyd, acrylic structures but modified with monomers and prepolymers containing isocyanate groups to improve flexibility, chemical resistance and so on.

Urethane resins

Urethane resins are formed by reactions of compounds bearing at least two isocyanate groups with molecules with more than one hydroxyl groups. Urethane coatings have high water, solvent and chemical resistance. Urethane coatings with no aromatic groups have superior UV resistance.

Production quality

Assessment of how close the characteristics of a product and service are after production process, relative to those projected during design stage. See Also Design quality

Polymerization product of urea and formaldehyde. Commonly used as adhesives. In addition, they are used as cross-linker in alkyd and polyester baking systems.

Resins that have alkyd, acrylic structures but modified with monomers and prepolymers containing isocyanate groups to improve flexibility, chemical resistance and so on.

Polyurethane resins

See Urethane resins

Urethane resins

Urethane resins are formed by reactions of compounds bearing at least two isocyanate groups with molecules with more than one hydroxyl groups. Urethane coatings have high water, solvent and chemical resistance. Urethane coatings with no aromatic groups have superior UV resistance.

See UV stabilizers

General name of additives used to prevent degradation of organic coating films exposed to UV light. UV stabilizers are classified into two groups. UV stabilizers (also called as UV absorbers). They convert the absorbed UV energy into heat and this heat is then dissipated through the substrate. Benzophenones and benzotriazole derivatives are commonly used UV stabilizers. The other group is free radical scavengers. They act by trapping the free radicals formed by UV light and decompose these radicals along with themselves hereby suppress the degradation of coating. Hindered amine light stabilizers (HALS) are used as free radical scavengers.

 

UV stabilizers

General name of additives used to prevent degradation of organic coating films exposed to UV light. UV stabilizers are classified into two groups. UV stabilizers (also called as UV absorbers). They convert the absorbed UV energy into heat and this heat is then dissipated through the substrate. Benzophenones and benzotriazole derivatives are commonly used UV stabilizers. The other group is free radical scavengers. They act by trapping the free radicals formed by UV light and decompose these radicals along with themselves hereby suppress the degradation of coating. Hindered amine light stabilizers (HALS) are used as free radical scavengers.

UV absorbers

See UV stabilizers

General name of additives used to prevent degradation of organic coating films exposed to UV light. UV stabilizers are classified into two groups. UV stabilizers (also called as UV absorbers). They convert the absorbed UV energy into heat and this heat is then dissipated through the substrate. Benzophenones and benzotriazole derivatives are commonly used UV stabilizers. The other group is free radical scavengers. They act by trapping the free radicals formed by UV light and decompose these radicals along with themselves hereby suppress the degradation of coating. Hindered amine light stabilizers (HALS) are used as free radical scavengers.

A test performed to predict the degrading effect of outdoor exposure as UV light, rain/fog and temperature change. Especially, it is a common belief that, degradation of binders during the UV cycle of the test, under high energy radiation which does not exist under natural exposures, disturbs its simulation quality.