How Does a Waterborne Coating Balance Thickening and Leveling? DH-7216S Explained- Suzhou Qingtian New Material Co., Ltd.

How Does a Waterborne Coating Balance Thickening and Leveling? DH-7216S Explained

2026/07/23

Waterborne Coating · Thickening & Leveling Balance · DH-7216S

In waterborne coatings, adhesives, and related systems, viscosity directly affects storage stability, application flow, and the final film appearance. Standard thickening approaches can easily cause leveling to decline or limit application performance. A polyurethane associative thickener can adjust the system's rheological properties to achieve balance between high viscosity at low shear and easy application at high shear.

Section One — Introduction

In waterborne coatings, adhesives, and related systems, viscosity affects not only product storage stability but also application performance and final film appearance. If system viscosity is too low, settling and sagging problems can easily occur; if viscosity is too high, application may become difficult and leveling performance may decline.

Therefore, an effective thickening system needs to adjust rheological properties according to different shear states — ensuring stability while also allowing smooth application and good film appearance.

Section Two — Common Problems

Significant viscosity change during storage
Insufficient system stability over extended storage, affecting usability.

Poor flow during application
Unreasonable viscosity, causing coating difficulty or insufficient leveling.

Insufficient anti-settling effect
Pigments and fillers easily settle, affecting product uniformity.

Gloss reduction after thickening
Some thickeners may affect coating surface appearance.

Section Three — Limitations of Traditional Thickening Approaches

Traditional thickening methods typically improve stability by raising the overall system viscosity, but excessive thickening may reduce the coating's flow ability and affect application performance.

For waterborne coatings, the ideal thickener needs not only to provide sufficient structural viscosity, but also to have good thixotropic capability — keeping the system stable at rest while remaining easy to flow during application.

Section Four — Product Application Approach: DH-7216S

DH-7216S · Polyurethane Associative Waterborne Thickener

DH-7216S is a polyurethane associative waterborne thickener that adjusts the system's rheological structure to achieve higher viscosity in the low-shear state along with good pseudoplastic behaviour.

Dispersion Compatibility

Excellent compatibility across dispersed systems — helps improve pigment wetting and system stability.

Thixotropic Performance

Good thixotropic behaviour — the system is stable at rest and flows freely under application shear.

pH Stability

Non-ionic structure — less affected by pH changes in the system.

Gloss Preservation

Does not significantly affect film gloss — helps balance thickening, stability, and application performance.

Suitable for waterborne coatings and waterborne adhesive systems.

Section Five — Summary

The performance of a waterborne coating is not determined solely by resin and pigment — rheology equally affects the final result. Selecting a polyurethane associative thickener appropriately can improve system viscosity stability, increase application adaptability, and maintain good leveling and film appearance.

Frequently Asked Questions

Can DH-7216S be used as the sole thickener in a waterborne formulation?

It can function as the primary thickener in many waterborne systems. For formulations requiring very high low-shear viscosity — such as heavy mastics or textured coatings — it is sometimes combined with a cellulose or inorganic thickener to achieve the target viscosity profile across all shear states.

Why does adding too much thickener sometimes reduce leveling rather than improve it?

Increasing thickener dosage raises the structural viscosity that the film must overcome to level during the open time. Once the structural viscosity is high enough that leveling forces cannot overcome it before the film begins to set, surface texture is locked in. Matching the thickener type and dosage to the target application shear rate — not simply the storage viscosity — is the key to balancing the two properties.

Does DH-7216S affect freeze-thaw stability of the waterborne system?

Polyurethane associative thickeners can be sensitive to freeze-thaw cycling under some conditions. Freeze-thaw stability testing of the complete formulation is recommended for any product that may be exposed to sub-zero temperatures during storage or transport.