Characteristicsinstructions：
Urea-formaldehyde
resin-YY-257 is a colorlessslightly yellow aldehyde condensation resin,
insoluble in water, soluble in most organic solvents,paint / ink
formulations raw materials have good compatibility, with excellent
anti-yellowing properties . Primarily used for general paste grinding resin and
used in paint formulations, with good color development properties, can
effectively improve the adhesion, hardness, gloss, solids contentfullness
of the film coatings. It is a multi-functional coating / ink additives.
Main technical index:
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Test items
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Index
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Test method
|
|
Appearance
|
Colorlessslightly yellow transparent solid
powdergranules
|
Visual
|
|
Softening point
(℃)
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80-100
|
ISO 4625-1:2004
|
|
Gardner Color
*
|
＜3
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ISO 4630-1:2004
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|
Acid value
(mgKOH/g)
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＜3
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ISO 2114:2000
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Hydroxyl value
(mgKOH/g)
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40-80
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DIN 53240-2:1998
|
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Density
(g/cm3)
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1.10±0.05
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ISO 1183-1:2004(E)B
|
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Moisture (%)
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≤1.0
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ISO 760：2000
|
|
Content of free formaldehyde
(%)
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≤0.3
|
|
Application:
Urea-formaldehyde
resin-YY-257 due to its excellent compatibilitysolubility in solvent, so
that it can be used in various types of paint / ink formulation; can
effectively improve the film gloss, adhesion, hardness, resistance to
yellowing; has good pigmentfiller wetting propertiesits dissolution
and melting viscosity low, is the excellent performance of the general color
paste grinding resin, in coating application can improve the coating of solid
content; has excellent weathering resistanceyellowing resistance.
