BYK RHEOBYK 425 Liquid Rheology Additive

RHEOBYK -425

Liquid rheology additive, VOC-free, used in water-based systems, to adjust the viscosity in the tank, Improves anti-sagging and anti-settling properties.

Chemical composition

Urea-modified polyurethane solution APEO-free VOC-free

Typical physical and chemical data

The data given on this data page are only typical values, not the technical indicators of the product.

Storage and Shipping

RHEOBYK-425 should be stored at 10-40°C. If the storage environment changes, the additive may appear uneven, but it will not affect the rheological properties. Mix well before use.

Application

Coatings, printing inks and adhesives

Product characteristics and advantages: The rheological properties of RHEOBYK-425 mainly depend on the water-based resin dispersion The interaction of particles has obvious pseudoplastic fluid behavior. Urea-modified additives enhance rheological properties through hydrogen bonding. RHEOBYK-425 is VOC- and APEO-free, does not affect gloss, and its rheological properties are independent of pH.

Recommended Purpose

RHEOBYK-425 is suitable for a variety of water-based coatings, printing inks and adhesives to improve flow resistance Suspension and formulation to adjust desired in-can viscosity. Viscosity increases while improving storage stability and reducing sedimentation. When milling color pastes, this additive increases the viscosity of the millbase and thus improves the dispersion conditions.

To significantly reduce the application viscosity of the formulation (for example, conventional spraying of paints), RHEOBYK-425 is recommended to be used together with RHEOBYK-420 (or BYK-D420 or RHEOBYK-7420ES), because anti-settling is more Obvious.

Recommended dosage

Adjuvant dosage of 0.1-2% in the total formula (in the form of purchase).

The above recommended dosage is for reference, and the optimal dosage needs to be determined through a series of experiments.

Adding method and processing Guidance

RHEOBYK-425 can be added to the formulation at any time during the production process; Add at the end of the force. If RHEOBYK-425 is used dry to increase the viscosity of the grinding base to improve the dispersion conditions of the color paste, it can be directly added to the grinding base.

Due to excellent rheological properties, this additive may cause a sharp increase in viscosity, resulting in subsequent Handling is difficult. In this case, it is recommended to use the method of pre-diluted RHEOBYK-425. It can be diluted with water (10 parts of RHEOBYK-425+90 parts of water), and water/solvent mixture can also be used as a standard coalescent (for example, 20 parts of RHEOBYK-425+70 parts of water+10 parts of coalescent). RHEOBYK-425 has high viscosity at low temperature, pre-dilution can effectively reduce viscosity. The storage stability of the diluted solutions was tested individually.

Washing cleaning and maintenance products

Product characteristics and advantages: The rheological properties of RHEOBYK-425 depend on the surfactant in the system The micellar interactions produce pronounced pseudoplastic fluid behavior. In addition, urea-modified additives further enhance the rheological properties through hydrogen bonding. The rheological behavior is thus excellent, e.g. preventing the settling of particles (e.g. packaged perfumes) without negatively affecting the emptying of residual containers.

RHEOBYK-425 is VOC and APEO free. The adjuvant is liquid and easy to handle. Its thickening effect does not depend on the pH value. The anti-sedimentation property is more obvious when the pH value is greater than 4.5. Very good compatibility with surfactants, especially cationic surfactants. The rheological properties of associative thickeners depend on the composition of the respective system. The transparency of the application system remains unchanged.

Recommended use

RHEOBYK-425 is used as a thickener and anti-settling agent for water-based systems.

Recommended dosage

0.1-1.0% additive dosage (purchased form) is based on the total formula, depending on the formula required performance.

The above recommended dosage is for reference, and the optimal dosage needs to be determined through a series of experiments.

Adding method and processing Guidance

RHEOBYK-425 can be added to the formulation at any time during the formulation process; Add at the end of the force.

Due to excellent rheological properties, this additive may cause a sharp increase in viscosity, resulting in subsequent Handling is difficult. In this case, it is recommended to use the method of pre-diluted RHEOBYK-425. Dilute N0 parts of RHEOBYK-425+90 parts of water with water). RHEOBYK-425 has high viscosity at low temperature, and pre-dilution can effectively reduce the viscosity at this time. The storage stability of diluted solutions should be tested individually.

It can be added to the recipe at any time during the production process; it is recommended to add it at the end under suitable shear force.

Due to excellent rheological properties, this additive may cause a sharp increase in viscosity, resulting in subsequent Handling is difficult. In this case, it is recommended to use the method of pre-diluted RHEOBYK-425. Dilute N0 parts of RHEOBYK-425+90 parts of water with water). RHEOBYK-425 has high viscosity at low temperature, and pre-dilution can effectively reduce the viscosity at this time. The storage stability of diluted solutions should be tested individually.