QK4200 Liquid Rheological Agent

Name: QK4200 Liquid Rheological Agent
Brand: LIYANG New Chem

Liquid polyurea rheology additive for waterborne and water/glycol-ether systems, dosed for anti-settling or anti-sag.

Positioned against BYK 420

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QK4200 Liquid Rheological Agent identification panel showing model code, chemistry family and the grade it is positioned against

Product Overview

QK4200 is a liquid polyurea rheology additive for waterborne, dispersion and emulsion systems. Stirred into the coating it builds a three-dimensional network that gives strongly shear-thinning flow, so pigment stays in suspension and film build holds on vertical surfaces without flattening out the levelling. It works in water, water/glycol-ether and alcohol-solvent blends, and can be post-added to correct a batch that has already been let down.

Key Benefits

Shear-thinning network forms after stirring, so the coating stays brushable but recovers body at rest
Prevents pigment and filler settling in storage without a separate anti-settling paste
Holds film build on vertical surfaces at 0.5-2% without hurting flow and levelling
Post-addable, so an under-bodied batch can be corrected instead of reworked
Effective in water, water/glycol-ether and alcohol-solvent blends

At A Glance

Chemistry: Modified polyurea solution
Family: Rheology Control
Category: Coating Additives
Positioned against: BYK 420
Appearance reference: Light yellow to brownish yellow liquid

Who It Is For

Industrial coating formulators moving solventborne recipes across to water
Paint plants that store filled stock for months before shipment
Toll manufacturers who need a post-addable viscosity lever on the filling line

Problems It Solves

Hard settling that will not redisperse with drum agitation
Runs and sags on vertical panels at the film build the specification asks for
Batch-to-batch viscosity drift that would otherwise mean reworking a full tank

Application Scenarios

Waterborne industrial topcoats sprayed on vertical steelwork
High-pigment-load primers that separate during long storage
Emulsion systems where a pre-gel paste would need extra grinding equipment
Correcting viscosity on a finished batch before filling

Technical Features

Chemistry is a modified polyurea solution, not a fumed silica or bentonite thickener
50% non-volatile content, so a small addition carries a lot of active structure
Viscosity 300-1600 cps at 25C keeps it pumpable at ambient temperature
Moisture sensitive: slight haze during storage does not change the rheology effect

Specification

Typical Data And Dosage

Typical values are indicative of the product and are not release specifications. Figures are reproduced from the manufacturer data sheet.

Chemical composition	Modified polyurea solution
Appearance	Light yellow to brownish yellow liquid
Non-volatile content	50%
Density	1.05-1.15 g/cm3
Viscosity (25C)	300-1600 cps
Solvent	N-methylpyrrolidone
Storage	Dry conditions, temperature sensitive
Shelf life	12 months maximum
Packing	25 kg / 180 kg

Recommended Dosage

All dispersant and additive dosage figures below are quoted exactly as the source data sheet quotes them. Dispersant figures are percentages on pigment weight, not on the total batch. The published values are empirical, so confirm the optimum with a dosage ladder in your own system.

Anti-settling	0.2-1% on total formulation
Anti-sag	0.5-2% on total formulation

Use Guide

Add under moderate shear so the additive mixes evenly and disperses quickly.
No special temperature control is needed. It can go in at the mill base stage or be post-added to adjust viscosity.
Allow 2-24 hours after mixing before judging the rheology; build-up depends on time and system polarity.
If a drier is used in the same formulation, watch for discoloration from metal complex formation and re-check the rheology.

Quality Control On Your Side

Typical values on the data sheet are indicative, not release specifications
Confirm the optimum addition level by a dosage ladder in your own system
Check yellowing at the top of the dosage range before locking a white or pastel formulation

Comparison

How It Compares With The Alternatives

Technical comparison against other ways of solving the same problem. Nothing here is a performance claim against a named commercial product.

Fumed silica	Comes ready as a liquid, so no high-shear pre-dispersion step and no dust handling.
Bentonite pre-gel	No separate pre-gel preparation and no water-to-clay ratio to control on the plant floor.
Associative polyurethane thickener	Builds thixotropy for settling and sag control rather than lifting the whole viscosity curve.

Customisation And Supply

Packing as published on this page; other pack sizes are confirmed per order
Technical data sheet and, where available, safety data sheet supplied by email on request
Tailor-made products can be discussed; send the property you need and the system it goes into
Shipped from Tianjin, China by sea or air

Questions