Shear Thinning Rheology Modifier Additive for Water-Based Paints

Borchi® Gel PN is a shear thinning, thixotropic rheology modifier additive for water-based paints. It provides desired thixotropy properties in the low shear range.

 

Benefits of Shear Thinning Rheology Modifiers

Borchi® Gel PN is a VOC-, APEO- and tin-free organic zirconium complex thickener neutralized with ammonia. Benefits of this rheology additive include highly effective storage stability and prevention of settling and sagging. It improves viscosity stability after tinting with universal colorants in water-based coatings systems.

 

shear thinning rheology modifiers for waterborne paints prevent paint sedimentation

Borchi® Gel PN prevents long-term paint sedimentation and syneresis (photo shows coatings after 2 weeks of storage at 40 ºC)

 

Concentration levels need to be optimized as too high a level can lead to excessive crosslinking, which may cause separation and structure loss. There is no need for biocides when using this product.

 

 

 

 

Using Borchi® Gel PN Rheology Modifier with Inorganic Pigment Dispersants and Cellulosic Thickeners

Borchi® Gel PN can be used with our Borchi® Gen 1252 wetting and dispersing agent for titanium dioxide (TiO2) pigment dispersions. Benefits of using both products together include the elimination of settling, as well as improved viscosity variance over time and extended heat age stability. Borchi® Gen 1252 provides high opacity and strong tint strength in pigments. There is no change in gloss or contrast ratio with the use of these products. Borchi® Gel PN is more effective than fumed silica in TiO2 formulations.

 

75% TiO2 Concentration

TiO2 dispersant / dispersing agent for TiO2 viscosity stability

Viscosity stability is better over time with Borchi® Gel PN for TiO2 dispersions

 

Borchi® Gel PN can also be used with our Borchi® Gen 1757 wetting and dispersing agent for bismuth vanadate pigment dispersions. Benefits of combining these products include better storage stability and the elimination of settling in bismuth vanadate pigments.

 

thixotropic shear thinning rheology modifier for viscosity stability in bismuth vanadate pigment dispersions

Borchi® Gel PN in WB PY 184 dispersion brings anti-settlementation and long-term stabilization of dense inorganic pigments. The viscosity profile does not impact the flow behavior of the pigment concentrate, allowing for higher pigment loading when used in combination with Borchi® Gen 1757

 

When used with a cellulosic thickener, Borchi® Gel PN builds up viscosity and sag resistance. Its thixotropic profile allows for superior sag resistance and leveling. Borchi® Gel PN has a lowered spattering tendency compared to cellulosic thickeners and builds a stronger rheological network that is resistant to water and solvent impact.

 

thixotropic thickener with cellulosic thickener

Borchi® Gel PN builds up viscosity and improves sag resistance when used with a cellulosic thickener

 

Borchi® Gel PN can be used with medium and high shear thickeners like Borchi® Gel L75 N for improved hiding power.

 

Similar Rheology Modifiers

Other rheology modifier additives from Borchers that are known for thixotropy in the low shear range and based on an organic zirconium complex include Borchi® Gel NA. Borchi® Gel NA is neutralized with sodium hydroxide.

 

low shear thixotropic thickeners / rheology modifiers for waterborne paints prevent viscosity drop from addition of universal colorants

Shear thinning rheology modifiers for water-based paints like Borchi® Gel PN and Borchi® Gel NA prevent drops in viscosity when adding universal colorants

 

Increasing Borchi® Gel PN/NA Concentration / Decreasing Resin Concentration

shear thinning rheology modifiers for waterborne paints dosage level / low shear

The level of Borchi® Gel PN or Borchi® Gel NA is important.  Too much can lead to excessive crosslinking, which may cause separation and structure loss

 

 

Applications

Borchi® Gel PN is ideal for use in architectural and general industrial coating applications.

 

Resources

Click here for sales tool with Borchi® Gen 1252

Click here for sales tool with Borchi® Gen 1757

  • Physical Characteristics

    AppearanceClear, colorless to slight yellowish liquid
    Non-volatile contentNA
    pHNA
    Density1.23 g/cm3 DIN 51757
    (20 °C)
    ViscosityNA
    Solvent(s)Water

  • Features

    • Thixotropic additive for use in water-based coatings systems whose binders or additives contain free hydroxyl and carboxyl groups
    • Strongly pseudoplastic and non-Newtonian rheology modifier
    • Contains shear thinning behavior
    • Develops viscosity in the low shear range
    • Improves viscosity stability after tinting with Universal Colorants in coatings
    • Once applied, the structure rebuilds slowly for improved flow and leveling while retaining good sag resistance
    • VOC-free
    • APEO-free
    • Tin-free

  • Applications

    • Wide range of polymer systems
      • Vinyl acetate
      • Acrylic
      • Styrene acrylic
      • Colloid
      • Surfactant stabilized polymers
    • Coatings
      • Interior
      • Exterior

  • Dosage

    • 0.5 – 2.0% on total paint formulation

    The degree of thixotropy will depend on the type of reactive groups present in the system, the pH of the coating (ideally between 7.5 and 8.5), the level of the desired gel structure and the amount of Borchi® Gel PN used. The exact dosage should be experimentally determined. Borchi® Gel PN can be added to the mill-base or as a post add provided good mixing conditions are used.

  • Storage

    Protect from the effects of weathering and store at temperatures between 5 and 30 °C. Once opened, containers should be
    resealed immediately after each removal of the product.

  • Safety

    Please refer to our safety data sheet for information relating to product safety.

Registration :

For chemical inventory status, please review section 15 of the current SDS.

Click here to access the SDS portal.

For additional regulatory information, please contact regulatory@milliken.com.

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