Product Specification

WL-181C Water Based Saturated Polyester Resins

Introduction

 WL-181C Water Based Saturated Polyester Resins is A high-performance, oil-free resin engineered for industrial baking coatings. With ‌>73% solid content‌, this formulation maximizes production yield while delivering coatings with exceptional gloss retention, substrate adhesion, and flexibility.

‌Recommended Crosslinking System‌:

Amino Resins‌: Cytec 303 (fast-cure) / Cytec 305 (enhanced flexibility)

‌Catalysts‌: Proprietary acid catalysts optimized for urea/melamine curing mechanisms

‌Resultant Coating Properties‌:

‌Optical Excellence‌: Mirror-like gloss ,with crystal-clear transparency

‌Adhesion‌: Excellent adhesion to metals such as black metal and aluminum alloy

‌Robust Performance‌: 3H+ pencil hardness, MEK resistance >150 double-rubs, and superior pigment dispersion

‌Ideal For‌: Automotive trim coatings, appliance finishes, and high-end metalware requiring laboratory-grade durability with eco-compliance.

Physical Property

‌ Performance Features‌

l  ‌High-definition gloss finish‌ with optical-grade transparency.

l  High-solids formulation‌ minimizes solvent usage while optimizing spray/flow properties.

l  Exceptional shear stability‌ for high-intensity pigment dispersion processes.

l  ‌Substrate-adaptive flexibility‌ on metal, plastic, and composite surfaces.

Applications

l  Mainly used for the preparation of amino stoving paint,

l  Solid color paint, flash paint used in steel drums, wheel hubs, bicycles and electric vehicles and other industries

l  Stoving paints for generally industrial coatings and coil coatings.

 Amino-modified waterborne saturated polyester resins represent a breakthrough in eco-friendly, high-performance industrial coatings. By integrating reactive amino groups into the polymer backbone, these resins achieve enhanced crosslinking density and thermal stability , resulting in coatings with ‌>3H pencil hardness‌, ‌ short-term heat resistance‌, and ‌MEK resistance exceeding 200 double rubs‌. Their waterborne formulation ensures ultra-low VOC emissions, aligning with global environmental regulations. When combined with melamine-based crosslinkers and acid catalysts, the system delivers high gloss retention‌ and ‌high adhesion‌ on metals, making it ideal for automotive components, appliance finishes, and industrial machinery requiring durability, chemical resistance, and aesthetic precision.

Application Guide

◆ After it 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.

◆ It is a water-dilutable saturated polyester resin, which can be infinitely diluted with deionized water.

◆ The pH value can be adjusted with organic amine or ammonia water, and the viscosity of the emulsion will increase with the increase in pH value.

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.