Thixotropic Agent for Rheology

Borchi® Gel NA is a low shear thixotropic additive in paint. As a rheology modifier, it provides improved viscosity stability after tinting with universal colorants in water-based coatings systems.

Characteristics of a Thixotropic Rheology Modifier Additive

This strong shear thinning rheology modifier agent is a VOC-, APEO- and tin-free organic zirconium complex neutralized with sodium hydroxide. Benefits include highly effective storage stability, as well as the prevention of settling and separation of pigments.

A thixotropic agent designed for thickening paint is ideal for brush and roller applications, and allows for efficient flow and leveling. They can also create a gel structure that is dosage dependent.

thixotropic agent rheology modifier brush and roller paint flow and levelingSolid Paint based on a styrene acrylic polymer.  Modified hydroxyethyl methyl cellulose (HEMC) in combination with 1.5% Borchi® Gel NA

 

Most binders that work with Borchi® Gel NA are for decorative systems and have strong hydroxyl and carboxyl functionality. This is also the case for Borchi® Gel PN, a shear thinning rheology modifier neutralized with ammonia. However, these rheology additives can also work for industrial systems with strong hydroxyl and carboxyl functionality.

 

This thickening agent does not contain any odor and 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.

Other solutions

Other thixotropic shear thinning rheology modifier additives from Borchers include Borchi® Gel PN.

performance of Borchi Gel NA in paint systems with resins thixotropic rheology modifier additive

Borchi® Gel NA and PN show improved viscosity compared to competitive thixotropic rheology additive. Can be used in architectural, wood, industrial and metal systems

Borchi Gel NA thixotropic thickening agent crosslinking

The level of Borchi® Gel PN/NA is important as too much can lead to excessive crosslinking.  This may cause separation and structure loss. As more of the rheology modifier is added, the amount of resin should decrease.

 

  • 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 :
  • Europe : EINECS
  • Korea : ECL
  • Taiwan : NECI