Water based Wetting & Dispersing Agent HXFS02
Wetting and Dispersing Additives
Technical Information
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Hydrophobically modified ammonium polyacrylate dispersant (pale yellow clear liquid, 19–21% active)
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Low dosage, reduces grinding viscosity, improves storage stability, leveling, gloss, and water resistance
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Boosts tinting strength and accelerates drying
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Ideal for architectural coatings (exterior/interior), especially high-gloss formulations
Overview:
Water based Wetting & Dispersing Agent HXFS02 is a special ammonium polycarboxylate dispersant, with main composition of modified ammonium polyacrylate polymer solution. At 25°C, it presents as a pale yellow clear liquid, using water as solvent and having an active content of 19.0%-21.0%.
As a hydrophobically modified product, Water based Wetting & Dispersing Agent HXFS02 reduces grinding viscosity, improves coating storage stability and leveling, and has higher dispersion efficiency than conventional Water-resistant dispersants (allowing lower dosage). It also boosts paint tinting strength, significantly enhances film gloss and water resistance, and accelerates drying speed. Mainly applied in architectural coatings (exterior/interior walls) that require water resistance, it is particularly suitable for high-gloss coatings.
Why HXFS02?
Water based Wetting & Dispersing Agent HXFS02 is a hydrophobically modified ammonium polyacrylate dispersant engineered for architectural coatings where water resistance is the decisive performance criterion. Compared to conventional polyacrylate dispersants, its hydrophobic modification delivers a dual benefit: it reduces pigment grinding viscosity while simultaneously imparting post-film-formation water repellency — a property that standard hydrophilic dispersants cannot provide. This makes HXFS02 the preferred choice for exterior wall paints exposed to rain, humidity, and freeze-thaw cycles. In a typical exterior acrylic formulation, replacing a standard sodium polyacrylate dispersant with HXFS02 at 0.3–0.5% on pigment weight improves early water resistance by 20–30% without adding separate hydrophobic additives. The product also accelerates film drying, which is critical in high-humidity application environments where slow drying leads to dirt pickup and surface defects. Unlike HXFS01 (designed for inorganic pigment concentrates) and HXFS03 (a steric-stabilization block copolymer), HXFS02 targets the architectural coatings segment with an optimized balance of electrostatic repulsion and hydrophobic surface modification — delivering gloss retention, leveling, and storage stability in a single low-dosage additive.
Main Composition:
Modified ammonium polyacrylate polymer solution
Physicochemical Parameters:
| Parameter | Value |
| Appearance (25°C) | Pale yellow clear liquid |
| Solvent | Water |
| Active Content | 19.0%-21.0% |
Parameter Interpretation
- Appearance (25°C) — Pale yellow clear liquid: The pale yellow color indicates the presence of ammonium counterions in the polymer solution. Clarity confirms complete solubilization and absence of insoluble polymer fractions, which is essential for gloss-critical high-end architectural finishes where any haze would compromise film aesthetics.
- Solvent — Water: Water as the sole solvent makes HXFS02 fully VOC-free and compatible with zero-VOC architectural coating formulations, meeting LEED v4.1 and EU Directive 2004/42/EC requirements without reformulation adjustments.
- Active Content — 19.0%–21.0%: The moderate active content reflects the optimized molecular weight distribution of the ammonium polyacrylate. Lower active content (vs. HXFS01 at 44–46%) is intentional — the hydrophobically modified polymer is more surface-active per unit mass, achieving equivalent dispersion performance at lower net polymer addition rates.
Product Characteristics:
Hydrophobically modified ammonium polyacrylate polymer dispersant
Reduces grinding viscosity
Improves coating storage stability
Enhances gloss and leveling
Higher dispersion efficiency than conventional Water-resistant dispersants (allows lower dosage)
Effectively improves film water resistance, particularly suitable for high-gloss coatings
Applications:
Architectural coatings requiring water resistance (exterior/interior walls)
Recommended Dosage:
Inorganic pigments: 0.1-1%
(The above dosage is for reference only. Optimal dosage should be determined through testing.)
Addition Method:
Water-soluble, can be added directly
Storage & Packaging:
Non-toxic, non-flammable.
Shelf life: Minimum 12 months from production date when stored unopened in original containers at 4°C-40°C.
Packaging: 25kg & 200kg plastic-lined iron drums; 1000kg IBC totes.
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Frequently Asked Questions — Water based Wetting & Dispersing Agent HXFS02
How does hydrophobically modified ammonium polyacrylate improve water resistance in architectural coatings?
Hydrophobically modified ammonium polyacrylate dispersants like HXFS02 combine electrostatic pigment stabilization with hydrophobic side chains along the polymer backbone. During film formation, these hydrophobic segments migrate to the air-film interface and pigment-binder interface, creating a water-repellent barrier. This dual mechanism provides water resistance without the need for post-additive hydrophobic agents, reducing formulation complexity and cost. The ammonium counterions volatilize as ammonia during drying, leaving behind the water-insoluble polyacrylic acid backbone that contributes to long-term film integrity.
What is the recommended dosage of HXFS02 for high-gloss architectural coatings?
For high-gloss architectural coatings, the recommended dosage of HXFS02 is 0.1–1.0% based on inorganic pigment weight. For titanium dioxide (TiO₂) in a typical 20% PVC gloss formulation, start at 0.3–0.5% and optimize through grind viscosity measurement and gloss meter readings. Overdosing above 1.0% may cause foaming and reduced water resistance due to excess free surfactant. Always determine the optimal dosage through laboratory grind tests with your specific pigment-binder combination, as pigment surface area and binder type significantly influence dispersant demand.
What is the difference between HXFS02 and conventional sodium polyacrylate dispersants?
HXFS02 differs from conventional sodium polyacrylate dispersants in three critical ways: (1) Ammonium counterion — the ammonium salt form volatilizes during film drying, converting to water-insoluble polyacrylic acid that contributes to film water resistance, whereas sodium polyacrylate remains water-sensitive indefinitely. (2) Hydrophobic modification — engineered hydrophobic side chains provide built-in water repellency, eliminating the need for separate hydrophobic additives. (3) Higher dispersion efficiency per unit mass — despite lower active content (19–21% vs. typical 40–45% for sodium polyacrylates), the hydrophobically modified structure achieves equivalent or better pigment dispersion at lower net polymer addition, reducing the impact on film hardness and chemical resistance.
Can HXFS02 be used in combination with other wetting and dispersing agents?
Yes, HXFS02 can be effectively combined with other wetting agents for synergistic performance. For architectural coatings containing both inorganic pigments (TiO₂, calcium carbonate) and organic colorants, pair HXFS02 with a low-MW nonionic wetting agent (e.g., alkylphenol ethoxylate-free surfactant) to improve substrate wetting on low-energy surfaces. For water-based industrial coatings requiring both pigment dispersion and substrate adhesion, HXFS02 can be used alongside HXFS01 or HXFS03 in a dual-dispersant system. Always conduct compatibility testing: mix the dispersants in water first, verify no precipitation or phase separation occurs, then proceed to grind testing.