[admin]

In water-based coatings, packaging inks, and color pastes, pigment dispersion has a direct effect on processing and finished-product consistency. A formulation may look uniform immediately after production but develop settling, flocculation, color variation, or viscosity changes during storage if the pigment particles are not adequately stabilized.

This is why dispersant selection should be considered as part of the complete grinding and formulation process rather than simply as an additive for improving initial color strength. The dispersant needs to promote pigment wetting, help separate particles during grinding, and maintain that separation afterward.

The Water-Based Super Dispersant LD-6470 is a polymer dispersant developed for water-based pigment systems, including water-based inks and universal color pastes. Its active substance does not contain APEO-class environmentally harmful substances, which makes it relevant to formulators developing water-based systems with specific environmental considerations.

What Happens When Pigments Are Not Properly Dispersed?

Pigment particles naturally tend to form aggregates. During grinding, the liquid phase needs to wet the pigment surface effectively so that mechanical energy can break down larger agglomerates and distribute the particles throughout the formulation.

If wetting is insufficient, grinding may not achieve the desired particle distribution. The resulting paste can show reduced color development, inconsistent appearance, or difficulty reaching the required fineness.

The situation can become more apparent during storage. Pigments may gradually settle or form new aggregates, while changes in particle interaction can contribute to flocculation or viscosity variation. In a production environment, these problems can lead to additional mixing, filtration, adjustment, or even batch rejection.

A suitable polymer dispersant works at the pigment-liquid interface. By improving wetting and helping maintain particle separation, it can contribute to a more stable dispersion throughout processing and subsequent storage.

The Role of a Polymer Dispersant in Water-Based Systems

Dispersants perform several related functions, so evaluating one only by its initial color development can give an incomplete picture.

During the grinding stage, good pigment wetting allows the liquid medium and dispersant to reach the pigment surface more effectively. This helps the grinding equipment work against pigment agglomerates and promotes more uniform particle distribution.

Once the particles have been separated, stabilization becomes the next concern. If pigment particles readily come back together, the dispersion can lose stability even when the initial grinding result appears satisfactory.

For water-based formulations, the dispersant also needs to fit the chemistry of the surrounding system. Resin type, pigment surface characteristics, pigment loading, water content, grinding conditions, and other additives can all influence the final result.

This means that a dispersant should be evaluated as part of the complete formulation rather than treated as an isolated component.

How LD-6470 Fits Into Pigment Grinding

The Water-Based Super Dispersant LD-6470 is intended for water-based inks and universal color pastes where pigment wetting and dispersion stability are important.

Its use during grinding can improve the interaction between the pigment surface and liquid phase. Better wetting can help reduce pigment agglomeration and make the grinding process more efficient.

After grinding, the dispersant continues to play a role in keeping pigment particles separated. This is particularly relevant when a color paste needs to remain stable for an extended period before being incorporated into another formulation.

According to the product information, LD-6470 is also suitable for resin-free color pastes, where it can provide good storage stability while supporting tinting strength and gloss.

For formulators, this combination is useful because the practical objective is not simply to produce a fine pigment dispersion immediately after grinding. The dispersion should also maintain acceptable performance during storage and later use.

Application in Water-Based Packaging Inks

Packaging ink systems require consistent color from batch to batch. Small changes in pigment dispersion can affect color strength, shade consistency, viscosity, and the appearance of the printed layer.

A dispersant can be introduced during the grinding stage to help wet and distribute pigment particles. When dispersion is more uniform, pigment utilization can become more consistent, which may support repeatable tinting performance.

Gloss is another consideration. Large pigment agglomerates or uneven particle distribution can interfere with the uniformity of the applied ink film. Improving dispersion can therefore contribute to a smoother and more consistent surface appearance.

However, the optimum dispersant level depends on the pigment and the complete ink formulation. A dosage that works well with one pigment may not produce the same result with another. Laboratory trials should therefore compare several dosage levels rather than relying on a single fixed addition rate.

Using LD-6470 in Water-Based Paint Pastes

Universal color pastes need to combine strong color development with adequate storage stability and compatibility with different coating systems. This can make pigment stabilization particularly important.

For organic pigments, the recommended dosage of Water-Based Super Dispersant LD-6470 is 15%–30% based on the amount of organic pigment.

This range should be treated as a starting point for formulation development rather than an automatic production setting. Organic pigments can differ significantly in surface characteristics, particle size, oil absorption, and interaction with dispersants.

A practical development process is to prepare several samples with different dispersant levels while keeping other variables as consistent as possible. The samples can then be compared for grinding fineness, viscosity, tinting strength, gloss, appearance, and storage stability.

This approach provides more useful information than calculating the dispersant solely from total pigment concentration.

Why Tinting Strength and Gloss Should Be Evaluated Together

Color strength is often one of the first properties considered when evaluating a pigment dispersant. If pigment particles are efficiently wetted and distributed, more of the available pigment surface can participate in color development.

However, high tinting strength by itself does not necessarily mean that the dispersion is suitable for long-term use. A paste can show strong color immediately after grinding and still develop instability during storage.

Gloss provides another useful indication of dispersion quality. Poorly dispersed pigment particles and large agglomerates can interfere with surface uniformity after the coating or ink is applied.

For this reason, formulation trials should consider both immediate performance and longer-term behavior. Comparing tinting strength and gloss before and after storage can help identify whether a dispersant is providing stable performance rather than only a short-term improvement.

Technical Characteristics to Consider

LD-6470 is supplied as a brownish-yellow to yellow liquid. Its density at 25°C is listed at 1.05–1.20 g/cm³, with a flash point of 300°C. The cloud point is above 90°C, and the active ingredient content is listed as 100%.

These values are useful for formulation calculations, production documentation, and compatibility assessments. They can also help production teams establish consistent material-handling and batch-control procedures.

Nevertheless, technical specifications should not replace application testing. A dispersant's actual behavior can change depending on pigment chemistry, grinding equipment, solids content, water quality, resin or resin-free formulation, and other additives.

For a new formulation, laboratory testing under conditions that closely represent the intended production process remains the more reliable method of determining suitability.

A Step-by-Step Testing Method for Dispersant Selection

When introducing a dispersant into an existing water-based pigment system, a controlled comparison can make formulation development more efficient.

Start by preparing the pigment and grinding medium according to the target formulation. Add the dispersant during the grinding stage and prepare multiple samples using different dosage levels.

Next, evaluate the wetting and grinding behavior. Check whether the pigment is incorporated efficiently and whether the resulting paste reaches the required fineness.

After grinding, compare the samples for viscosity, color strength and gloss. If the formulation is intended for color matching, shade development should also be checked under consistent testing conditions.

Storage testing should then be performed. Depending on the application, samples can be observed for settling, flocculation, viscosity drift, changes in appearance, or other signs of instability.

For resin-free color pastes in particular, storage stability is an important part of the evaluation because the paste may need to remain usable for an extended period before final incorporation.

Packaging and Storage Considerations

LD-6470 is available in 25 kg and 200 kg plastic or iron drums. The material should be stored in a cool and dry location.

The stated shelf life is one year when the product remains unopened and is stored under the recommended conditions.

For industrial users, storage consistency is worth considering when conducting formulation trials. If different batches are evaluated under significantly different storage conditions, it can become difficult to determine whether performance changes are caused by the formulation or by material handling.

Maintaining batch records for dispersant lot numbers, addition levels, grinding conditions, pigment type and storage observations can therefore make future production adjustments easier.

Factors That Can Change the Required Dosage

There is no universal dispersant dosage that can be applied equally to every pigment system.

Pigment chemistry is one of the main variables. Organic pigments with different surface properties can require different levels of dispersant to achieve effective wetting and stabilization.

Pigment concentration is another factor, but it should not be considered alone. Grinding equipment, shear conditions, grinding time, water content, other additives, and the target viscosity can also influence the result.

For this reason, the 15%–30% dosage recommendation for organic pigments should be used as a practical development range. Testing several points within this range can help identify the balance between dispersion quality, color development, viscosity and storage performance.

Overdosing should also be avoided unless testing demonstrates a clear benefit. More dispersant does not automatically mean better dispersion, and excessive additive levels can affect the overall formulation balance.

Environmental Considerations in Water-Based Formulation

The move toward water-based coatings and inks is often accompanied by greater attention to raw-material selection and formulation chemistry.

For formulators, the environmental profile of an additive can therefore become one of several selection criteria alongside technical performance, compatibility, cost and processing behavior.

LD-6470 uses an active substance that does not contain APEO-class environmentally harmful substances. This provides an additional consideration for manufacturers developing water-based pigment systems where such substances are being avoided.

At the same time, environmental positioning should not replace technical validation. The dispersant still needs to demonstrate suitable wetting, dispersion stability, color performance and storage behavior in the actual formulation.

Choosing a Dispersant for the Complete Formulation

The most suitable dispersant is not necessarily the one that produces the strongest initial color response. A better evaluation considers the entire life of the pigment paste, from wetting and grinding through storage and final application.

For water-based packaging inks, the main priorities may include consistent color development, viscosity control and surface appearance. For universal paint pastes, storage stability and compatibility with different coating systems may receive greater attention.

In both cases, formulation testing should examine several performance indicators together. This helps avoid selecting a product based on a single measurement that does not represent the complete application.

The Water-Based Super Dispersant LD-6470 provides a polymer-based option for water-based pigment systems, with applications in water-based inks and resin-free color pastes. Its recommended organic-pigment dosage range, APEO-free active substance profile, and stated performance in storage stability, tinting strength and gloss give formulators several factors to evaluate during development.

Working With an Experienced Additive Manufacturer

For companies developing or modifying pigment systems, technical support from an experienced additive manufacturer can be useful when moving from laboratory trials to regular production.

Yangzhou Lida Resin Co., Ltd. has been involved in the R&D, production and sales of chemical additives since 1999. Its product range covers coating additives, acetylacetonate salts and coupling agents, including titanium, aluminum, boron and silicon series.

The company operates production facilities in Jiangsu Province and maintains R&D and quality evaluation capabilities for product development and application testing.

For international buyers evaluating dispersants for water-based coatings, packaging inks or paint pastes, supplier capability should be considered together with product specifications. Consistent production, quality control, technical communication and application support can all affect the efficiency of long-term sourcing.

Final Considerations Before Production

Before adopting a new dispersant for full-scale production, it is useful to confirm several points: pigment type, dispersant dosage, grinding sequence, grinding energy, target fineness, viscosity, color strength, gloss and storage stability.

Small-scale trials can reveal interactions that are not obvious from a technical data sheet. Comparing multiple dosage levels under controlled conditions can also help identify whether the dispersant is genuinely improving the formulation or simply changing one isolated property.

For water-based pigment systems where wetting, stable dispersion, color development and storage performance all matter, the Water-Based Super Dispersant LD-6470 can serve as a practical candidate for laboratory evaluation. The final dosage and processing conditions should be established according to the specific pigment and formulation rather than applied as a fixed recipe.

A systematic approach—controlled grinding, dosage comparison, performance testing and storage evaluation—gives formulators a clearer basis for deciding whether LD-6470 is suitable for their particular water-based ink, coating or color-paste system.

http://www.yzlida.com
Yangzhou Lida Resin Co., Ltd.

[Author]

Posts