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Coatings · Inks · FRP Systems · Inorganic Pigment Paste · DH-5010
Inorganic pigments added to coatings, inks, and glass-fibre-reinforced polymer (FRP) systems commonly produce a contradictory problem: high paste viscosity during processing and settling during static storage. The fundamental reason is that the dynamic flow state required during application and the static structure needed for storage stability impose opposite demands on the rheological state — and a dispersant addressing inorganic pigments must work across both.
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Conflicting demands: low viscosity during application, structural stability during storage
Why "High Viscosity" and "Settling" Can Happen Together
Inorganic Pigment Addition Raises Viscosity
Strong interfacial interactions between inorganic pigment and resin, combined with inter-particle network formation — especially for high-surface-area materials like fumed silica — cause the system to become noticeably more viscous and difficult to process.
Viscosity Lowered — But Settling Still Appears
Viscosity reduction and settling prevention are not the same direction. Systems with very low static viscosity lack the structural support to keep dense inorganic particles suspended during long storage — resulting in sedimentation even when initial viscosity is acceptable.
Dynamic and Static States Have Opposite Requirements
During application and mixing, good flow is needed. During static storage, structural support is needed to prevent settling. A purely low-viscosity system fails at storage; a purely high-viscosity system fails at application.
Fumed Silica Requires Special Attention to Dispersion
Fumed silica has large specific surface area and special particle structure, significantly affecting viscosity and thixotropy when incorporated. Without adequate wetting and dispersion, strong inter-particle interactions cause paste thickening and processing difficulty.
DH-5010: Dispersant for Inorganic Pigment Systems with Rheological Management
DH-5010 is a dispersant applicable to inorganic pigment wetting, dispersion, and settling prevention adjustment. Its application approach can be summarised as: managing the flow state during dynamic processing while providing structural support during static storage. In application and stirring, better flow helps pigment dispersion and coating spreading. After the material stops moving, the system needs to re-form a certain structure to prevent pigment from settling downward.
DH-5010 can be used for surface modification and dispersion of fumed silica and other inorganic materials, and is also applicable in unsaturated polyester FRP systems. Reference addition: 0.1%–5% of total formulation, adjusted according to pigment type, addition ratio, and resin system. For FRP systems, further evaluation combined with the resin system, actual moulding process, and mechanical properties is recommended.
Key Evaluation Criteria
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Viscosity Change After Addition
Observe whether paste viscosity changes after pigment addition and whether it remains at a processable level.
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Pigment Wetting and Dispersion State
Confirm whether pigment particles are adequately wetted — checking fineness and whether agglomerates are present.
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Flow State During Application
Evaluate flow and spreading during mixing, stirring, and application shear conditions.
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Static Settling After Storage
Observe settling degree and re-dispersibility after defined storage periods at ambient and elevated temperature.
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Viscosity Change Before and After Storage
Compare viscosity before and after storage to assess whether the rheological state is stable over time.
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Film Gloss and Surface State
Check whether the final cured film shows any surface or gloss effects from the dispersion state changes.
In inorganic pigment formulations, "viscosity reduction" and "settling prevention" appear to be opposite requirements — but both trace to the pigment's distribution state and the internal structure of the formulation. Simply raising viscosity to address settling, or reducing all structure to address viscosity, creates a trade-off that cannot be resolved at one end alone. Evaluating dispersant performance across both dynamic flow and static structural dimensions — through the viscosity, settling, and storage observations described above — gives a more complete picture of whether the dispersion system is suited to the specific application.
Frequently Asked Questions
Is the thixotropy that DH-5010 builds an intrinsic property of the additive or an emergent property of the dispersed system?
Both. DH-5010 improves the dispersion state of inorganic pigment particles — and the thixotropic character of the resulting system is an emergent property of the well-dispersed particles forming and breaking reversible networks. The additive enables the dispersion quality that allows this network behaviour to develop consistently. A poorly dispersed system with large agglomerates exhibits different rheological behaviour (often dilatant or unpredictable) compared to a well-dispersed system where the thixotropic network is formed by individually stabilised particles.
Can DH-5010 be used alongside conventional anti-settling agents (organoclays, modified ureas) in the same formulation?
Yes — combining dispersants with dedicated anti-settling agents is common practice. DH-5010 addresses pigment surface wetting and particle distribution; organoclays and modified urea additives build thixotropic network structure in the resin phase. Used together, they can provide a more complete rheological profile than either alone. However, the interaction between the two should be evaluated in the specific formulation, as some anti-settling agents and dispersants interact in ways that reduce the effectiveness of both.
