WL-187 Water Based Saturated Polyester Resin
Introduction
WL-187 is water based hydroxy-functional saturated polyester resin,
it has good flexibility and chemical resistance, excellent
versatility. It is usually used with amino crosslinkers (Cytec 325
and Cytec 303) for water-based amino baking varnish.
Physical Property
Appearance | Light yellow liquid | With eyes |
Solid content | 75±2% | 30min@120℃ |
Hydroxyl value | 115 mgKOH/g | For solid resin, theoretical value |
Viscosity (Brookfield 25℃)* | 30-70*mpa.s | NDJ-79 Rotational Viscometer |
Density | 1.142 g/cm3 | Densitym meter |
Viscosity *: after dilution with propylene glycol methylether (1:1)
Application Guide
◆ After WL-187 is neutralized with N, N-dimethylethanolamine( 5~6%
of the resin), it can be directly diluted with water.
◆ Add methylated amino resin (20%-30% of the resin) for baking and
curing. The baking temperature is above 120°C. The baking
conditions and paint film properties are related to the amino resin
used. When it used with the fully methylated amino resin, an acid
catalyst (0.5-1% of the resin) must be added, and the baking
temperature must be above 140°C.
Characteristics
WL-187 is a water-dilutable saturated polyester resin, which can be
infinitely diluted with deionized water after neutralized, it can
be stored stably under alkaline conditions, and will settle and
stratify under acidic conditions, which is especially obvious when
acidic pigments are added. Therefore, the diluted resin and
finished paint should be stored under weak alkaline conditions. The
pH can be adjusted using organic amines or ammonia. The viscosity
of the emulsion increases with increasing pH.
The diluted emulsion has excellent shear stability and can directly
participate in the grinding of pigment paste. Because the
structural characteristics of the resin help the wetting of
pigments and fillers. It is recommended not to add or add less
wetting agent when the resin is involved in grinding.
WL-187 has excellent hardness and flexibility after cross-linking
with amino resin, and can be widely used in coil and iron printing
industries.
Storage Condition
Store the product in a cool and dry place, the recommended storage
temperature is 0~40℃. The shelf life is one year. After the
expiration date, if the test passed, it still can be used.
.
Special Tips
This material is complied according to our existing technology and
experience, the technical advice provided is sincere, but it is not
guaranteed to be used in all samples and formulations, all the data
are for users reference only.
