Name: Hydrogenated Castor Oil Thickener HCO
Brand: Coatingsink
SKU: hydrogenated-castor-oil-thickener
Availability: InStock

Question 1

How does hydrogenated castor oil create a thixotropic gel network in solventborne coatings?

Accepted Answer

HCO forms a three-dimensional hydrogen-bond network through interactions between its hydroxyl groups and polar sites in the binder or solvent. This network provides structure at rest — preventing sag and pigment settling — but breaks down reversibly under shear during application, then recovers on standing. The recovery is temperature-dependent; faster at ambient temperatures typical of industrial spray application.

Question 2

Which solvent systems are compatible with HCO, and which should be avoided?

Accepted Answer

HCO performs well in aromatic and aliphatic solventborne systems including alkyd, epoxy, and polyurethane coatings. It is ineffective in strongly polar solvents such as ketones and esters, which disrupt hydrogen bonding and collapse the gel network. HCO is not suitable for waterborne formulations. For best results, pre-disperse HCO with heat at 80–90°C in a small aliquot of the primary solvent before addition to the mill base.

Question 3

What dosage range prevents sag in thick-film industrial coatings without causing excessive drag?

Accepted Answer

Start at 0.5% on total formulation weight for light anti-settling in thin-film systems. For thick-film anti-corrosion coatings (DFT >100 µm), use 1.5–2.5%. Over-addition beyond 3% creates excessive gel structure that raises application viscosity under shear and causes drag marks. Always evaluate sag resistance with a sag meter at the target wet film thickness and ambient temperature.

Appearance	White to off-white powder
Melting Point	83–88°C
Hydroxyl Value	155–165 mg KOH/g
Recommended Dosage	0.5–2.5%
Particle Size (D50)	≤15 µm

Hydrogenated Castor Oil Thickener HCO

Specifications

FAQ

Interested in Hydrogenated Castor Oil Thickener HCO?