QK8521 Waterborne Aluminium Pigment Orientation Agent

Name: QK8521 Waterborne Aluminium Pigment Orientation Agent
Brand: LIYANG New Chem

VOC-free EVA wax emulsion that lays aluminium and pearl pigment flat in waterborne basecoats.

Positioned against BYK 8421

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QK8521 Waterborne Aluminium Pigment Orientation Agent identification panel showing model code, chemistry family and the grade it is positioned against

Product Overview

QK8521 is a rheology-modified wax emulsion based on modified ethylene-vinyl acetate copolymer, supplied at 20% active in water with no VOC below 1500 ppm. It improves the orientation of effect pigments in waterborne coatings, cuts cloud patches and spotting, and is less sensitive to co-solvent than polyurethane thickeners. It arrives ready to use, so there is no bentonite pre-gel or acrylic thickener let-down to prepare.

Key Benefits

Lays effect pigment flat, reducing cloud patches and spotting
Less settling during storage and processing
Lower co-solvent sensitivity than polyurethane thickeners
Ready to use, unlike bentonite and acrylic thickeners that need preparation
No VOC below 1500 ppm, which keeps waterborne VOC budgets intact

At A Glance

Chemistry: Non-ionic modified EVA copolymer wax emulsion
Family: Rheology Control
Category: Coating Additives
Positioned against: BYK 8421
Appearance reference: See specification table

Who It Is For

Automotive coating formulators working to a tight VOC limit
Industrial and wood coating plants running metallic shades
Producers of co-solvent-free effect pigment pastes

Problems It Solves

Cloudy or patchy metallic panels caused by pigment not lying flat
Effect pigment settling out of storage
Orientation additives that lose effect as co-solvent content rises

Application Scenarios

Waterborne automotive basecoat, the application the data sheet recommends first
Waterborne industrial metallic coatings
Wood and furniture coatings needing an even metallic effect
Leather finishes

Technical Features

Modified EVA copolymer wax, non-ionic, carried in water
Wax melting point 105C
Supply viscosity 500 mPa.s, pH 5.0-7.0
Acidic on addition, so system pH should be lifted to 9-9.5 first
Final viscosity must be read on a rotational viscometer, not a flow cup

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	Non-ionic modified ethylene-vinyl acetate copolymer wax emulsion
VOC	None, below 1500 ppm
Active content	20 +/- 1%
Carrier	Water
Melting point (wax)	105C
Viscosity	500 mPa.s
pH	5.0-7.0
Storage and transport	0-35C
Shelf life	6 months at room temperature in the original package
Packing	50 kg / 200 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.

On total formulation, as supplied	5-10%

Use Guide

Add at a low shear rate after the effect pigment has been added. Do not pre-dilute with water.
Raise system pH to 9-9.5 before adding, because QK8521 is acidic and will pull the pH down. The higher the co-solvent content, the more pH headroom is needed.
Shake well before use and filter out any dried or hardened material.
Once opened, use the container up within a short period.
Read the final viscosity on a rotational viscometer such as a Brookfield, not a flow cup.

Quality Control On Your Side

Verify pH before and after addition on every batch
Filter before use to keep dried wax out of the line
Judge orientation on sprayed panels under controlled light

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.

Polyurethane thickener	Holds orientation better as co-solvent content rises.
Bentonite	Supplied ready to use, with no pre-gel preparation.
Acrylic thickener	Easier to add and handle, and less settling in storage.

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

QK8521 Waterborne Aluminium Pigment Orientation Agent Questions

What pH should the system be at before adding QK8521?

Raise the system to pH 9 to 9.5 before addition. The product is acidic and will lower system pH, and formulations with more co-solvent need more headroom.

Can it be diluted with water first?

No. Add it undiluted at low shear after the effect pigment.

What is the shelf life?

Six months at room temperature in the unopened original package. Store and transport between 0 and 35C.

How should final viscosity be measured?

With a rotational viscometer such as a Brookfield. A flow cup will not give a usable reading on this system.