Thixotropic Agent / Rheology Modifier

Borchi® Gel NA is a thixotropic additive for water-based paint formulations. This rheology modifier is a VOC-, APEO-, and tin-free organic zirconium complex thickener neutralized with sodium hydroxide. It is ideal for the low shear range.

 

Benefits of Thixotropic Agents

Borchi® Gel NA thixotropic additive provides improved viscosity stability after tinting with universal colorants in water-based coatings systems. Other benefits include highly effective storage stability, as well as the prevention of settling and separation.

Borchi® Gel NA allows for efficient flow and leveling. It can be optimized to create a gel structure that is dosage dependent.

 

low shear thixotropic thickener / rheology modifier

Solid paint based on a styrene acrylic polymer.  Modified hydroxyethyl methyl cellulose (HEMC) is used in combination with 1.5% Borchi® Gel NA

 

This thickening agent does not contain any odor and can be used as a post additive to adjust final viscosity in formulations. The concentration level is important as too high a level can lead to excessive crosslinking, which may cause separation and structure loss.

 

 

 

Similar Rheology Modifiers

Other organic zirconium complex thickeners from Borchers include Borchi® Gel PN. This solution is a shear thinning rheology modifier neutralized in ammonia.

 

Resin with 1.0% Borchi® Gel NA or 1.0% Borchi® Gel PN Concentration: Viscosity Measured After 24 hours

Borchi® Gel NA and PN show improved viscosity compared to a control. They are effective in architectural, industrial, and metal coatings

 

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

shear thinning rheology modifier dosage level / low shear

The level of Borchi® Gel PN/NA is important as too much can lead to excessive crosslinking.  This may cause separation and structure loss

 

 

Applications

Most binders that work with Borchi® Gel NA are for decorative systems and have strong hydroxyl and carboxyl functionality. However, this rheology modifier additive can also work in industrial systems with strong hydroxyl and carboxyl functionality. This solution works well in brush and roller applications.

  • Physical Characteristics

    AppearanceClear to slight turbid, colorless to yellowish liquid
    Non-volatile contentN/A
    pH6-8
    Density1.33 g/cm3 DIN 51757 (20°C)
    ViscosityN/A
    Solvent(s)Water

  • Features

    • Low shear thixotropic thickening agent for use in water-based coatings systems whose binders contain free hydroxyl and carboxyl groups
    • Develops viscosity in the low shear range to prevent
      settling and separation
    • Improves viscosity stability of a coating after tinting with
      Universal Colorants
    • Can be used as post additive to adjust the final viscosity
      of a formulation
    • 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

    Typical usage levels are 0.5 – 2.0 % as supplied based on the total weight of the formula. In difficult systems it could be necessary to increase the dosage up to 5 % (as supplied) on total 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 NA used. The exact dosage should be experimentally determined. We recommend adding Borchi® Gel NA at the end of the formula under good mixing conditions to prevent gel seeds from forming and to develop a homogeneous gel structure.

  • 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 [email protected].

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