Waterborne Silver Paint Lacks Whiteness and Flake Alignment: How to Choose the Resin- Suzhou Qingtian New Material Co., Ltd.

Waterborne Silver Paint Lacks Whiteness and Flake Alignment: How to Choose the Resin

2026/10/12

The metallic look of a waterborne silver metallic paint depends not only on the aluminium paste but also on the film-forming character of the resin, the arrangement of the flakes and the adhesion after baking. Choosing a water-soluble acrylic resin that pairs with amino resin, and adjusting grinding dispersion and baking conditions, helps improve whiteness, metallic appearance and adhesion to the substrate.

Introduction

Waterborne silver metallic paint is often used where a metallic look matters. Unlike plain solid colours, its final effect is not only colour: it includes flake arrangement, whiteness, metallic lustre and the state of the film after baking.

In formulation development, even with the same aluminium paste, a change in resin composition or processing can change the final appearance. Some formulations show imperfect flake arrangement and an uneven metallic feel; others show adhesion that falls short of expectations after baking.

Formulation design therefore has to consider resin film formation, flake orientation and baking cure together, rather than starting only from the pigment level.

What shapes the appearance of waterborne silver paint

Flake arrangement

How the aluminium paste is arranged in the film affects how light is reflected, and so the light-dark variation, whiteness and overall metallic impression. If the flakes are not neatly arranged, different areas of the film may look different. Besides the choice of aluminium paste and the dispersion process, look at how the resin affects flake arrangement and film formation.

Resin takes part in film formation

The resin does more than form the film. It also affects the application state and the film after baking. In a waterborne silver paint the resin must be well matched with the aluminium paste, the amino resin and the other components. With a wrong resin choice, even well-dispersed flakes may not give the expected appearance and adhesion.

Baking conditions

During baking of a waterborne stoving paint, water and other volatiles gradually escape and the resin system further forms a film and cures. The relationship between resin pairing, baking temperature and time affects the final film, so evaluation should include appearance and adhesion after baking, not just the wet paint.

Water-soluble acrylic resin

A water-soluble acrylic resin can serve as a film-forming resin for waterborne silver paint. In a stoving system it is usually combined with an amino resin, and the final film forms through a sound formulation and baking conditions. Flake appearance is not set by one resin alone: resin to amino resin ratio, aluminium paste type, addition method, film thickness and baking must be verified for each formulation.

AA-9661S: reference data and points to watch

AA-9661S is a water-soluble acrylic resin. According to the product data, it suits use together with amino resin, gives good flake arrangement and whiteness after baking, and still takes care of film adhesion. It can also be used for grinding and dispersing colour paste, which offers another approach for developing waterborne silver paints and related formulations.

Appearance Pale yellow transparent liquid Solid content 60% ± 2% Acid value 45–55 mgKOH/g Viscosity Z2–Z4 (25°C, Gardner) Solvent NBA/DPM

Three ways to test in a formulation

Check flake arrangement and whiteness

With the same aluminium paste type and level, compare film appearance across resin combinations and observe flake arrangement, evenness of light and dark, and changes in whiteness.

Evaluate adhesion after baking

Test on the target substrate with the actual baking process, and use adhesion test results to judge whether the resin pairing is suitable.

Watch the colour paste processing state

If AA-9661S is used for grinding and dispersing colour paste, check the uniformity after grinding and the storage state, according to pigment type, formulation and processing conditions.

Do not skip the amino resin pairing

In a waterborne stoving paint, the resin and amino resin combination affects curing and the final film. Set different resin ratios and baking conditions during development, and record flake arrangement, whiteness, film appearance and adhesion results. If appearance is acceptable but adhesion after baking is not, check resin pairing, substrate treatment and curing conditions rather than simply raising the aluminium paste level.

Comparing item by item makes it clearer how the resin combination affects the appearance and film formation of the silver paint.

Frequently Asked Questions

Does the aluminium paste alone decide the metallic look?

No. It also relates to the film-forming character of the resin, flake arrangement and adhesion after baking.

What kind of resin is AA-9661S?

A water-soluble acrylic resin suited to use with amino resin, and it can also be used for grinding and dispersing colour paste.

Why test the baked film and not only the wet paint?

Because during baking water and volatiles escape and the resin system forms a film and cures, which affects the final film state. Appearance and adhesion after baking should be part of the test.

What if the appearance is fine but adhesion after baking is poor?

Check resin pairing, substrate treatment and curing conditions, rather than directly increasing the aluminium paste.

Summary

The appearance of waterborne silver paint involves aluminium paste arrangement, resin film formation, amino resin pairing and baking conditions, so a formulation must balance the visual effect of the flakes with the state of the film after baking. AA-9661S is a water-soluble acrylic resin that can be combined with amino resin for waterborne silver paint and can also be used for grinding and dispersing colour paste. In practice, run comparison tests on resin ratio, aluminium paste type, processing method and baking process to determine the right approach for the target formulation.