NACURE®4000 - King Industries, Inc.

NACURE ® 4000
Alkyl Acid Phosphate Catalyst

NACURE ® 4000
NACURE ® 4000 is a 100% active alkyl acid
phosphate catalyst designed for use with high imino
(NH) or polymeric melamines and phenolic resins for
promoting adhesion to a variety of
substrates. It offers:
Excellent adhesion to metal and
aluminum substrates
Lower VOCs
Low temperature cures
Good long term package stability
Product Profile
NACURE 4000
Appearance
Clear, light straw liquid
% Active 100
Acid # 650
Specific gravity, 25°C 1.42
Weight per gallon, 25°C 11.8 lbs.
Use Levels & Incorporation
The typical use levels of NACURE 4000 is 0.5 to 3.0% as supplied on total resin solids (TRS).
100°C minimum bakes Butylated, polymeric amino resins 0.3 - 1.0% (TRS)
80°C minimum bakes Methylated, high imino amino resins 1.0 - 1.5% (TRS)
Ambient cures
Methylated, high imino amino resins
Highly alkylated, monomeric amino resins
>2.0% (TRS)
2.0 - 4.0% (TRS)
It is recommended to use a relatively high molecular weight acrylic resin for ambient cure conditions to
achieve films with optimum tack-free and through-cure properties.
Adhesion
NACURE 4000 offers excellent adhesion properties
to a variety of substrates. The formulation shown
in Graph 1.1 demonstrates excellent adhesion
properties found when using this catalyst to
accelerate the cure of a polymeric melamine resin
with a short oil alkyd. NACURE 4000 is compared
to several commercial acid phosphate products.
Catalyst dosages are adjusted to give the same
equivalents of phosphate in each formulation.
Formulations containing any of these weak acids
gives good adhesion to iron phosphate treated cold
rolled steel. However, significant advantages to
coating adhesion on aluminum are found with
NACURE 4000.
APA
APP
PP
4000
Graph 1.1 Adhesion to Aluminum & Steel
Bake Schedule: Adhesion 15 min./107°C
Steel
Aluminum
Table 1.1
Raw Material
Grams
0 20 40 60 80 100
% A dhe si on
Beckosol 12-035 Alkyd
Product of Reichhold
Cymel 247-10 butylated melamine
Product of Cytec
TiPure R-900 TiO2
Product of DuPont
41.66
13.02
26.66
n-Butanol 3.32
Xylene 15.34
Total 100.00
Table 1.2
Catalyst Levels (as supplied on total)
NACURE 4000 0.25
Phenyl Phosphate (PP) 0.84
Acid Pyrophosphate (APP) 0.43
Alkyl Phosphonic Acid (APA) 0.35

Cure Response
NACURE 4000 can be utilized with amino resins
that are available for coatings that need ambient
cure response. A solventbased clearcoat
demonstrating this is shown in Table 2.1. Ineos
Resimene 717 is a partially alkylated, high imino
melamine resin. This is combined with a high
molecular weight acrylic resin, using both 2% and
4% NACURE 4000 catalyst as supplied on total
resin solids to drive the reaction under ambient
conditions (25 - 28˚C).
Table 2.1 Catalyzed Ambient Cure Clearcoat
Raw Material No Catalyst 2% NACURE 4000
57% N.V. High MW
Acrylic
Resimene 717
Product of Ineos
BYK 306
Product of Byk Chemie
Xylene/nBuAcetate
(70/30)
70.18 70.78
12.01 12.01
0.20 0.20
17.01 16.01
NACURE 4000 0.00 1.00
TOTAL 100.0 100.0
Table 2.2 Catalyzed Clearcoat Film Properties
4% NACURE 4000
70.78
12.01
0.20
15.01
2.00
100.0
Properties on
Tinplate
Pencil Hardness
(1 week)
No Catalyst 2% NACURE 4000 4% NACURE 4000
HB H 2H
MEK Rub (2X) 5 120 150
% Crosshatch
Adhesion
80 90 100
Both catalyzed and uncatalyzed versions of this
coating are tack free after 20 minutes at ambient
temperatures. After one week of ambient cure time
the MEK solvent rub resistance shows a significant
improvement using NACURE 4000, indicating films
are more highly crosslinked than the control.
Additional improvements in crosshatch adhesion
are also evident in the catalyzed coatings.
Storage Stability
Graph 2.1 MEK Rubs
160
140
120
100
80
60
40
20
0
No Catalyst 2% 4%
% NACURE 4000 (TRS)
MEK Rubs (2X)
% Adhesion
NACURE 4000 is a free alkyl acid phosphate catalyst. It
can provide extended storage stability in formulations with
common techniques used to prolong catalyzed
coating shelf life. This includes the use of a minimum of
10% alcohol solvent to reduce premature amino resin
crosslinking and self-condensation reactions during storage.
This catalyst can provide superior storage stability at low
dosages in comparison to a variety of other acid
phosphate catalysts available. Graph 2.2 demonstrates
smaller viscosity increases using NACURE 4000 after 57
days of ambient storage in the coating shown in Table 1.1.
For optimum stability the catalyst can be added to the
coating at the time of application to avoid any shelf life
issues.
Graph 2.2 NACURE 4000 Adhesion & Stability
Bake Schedule: 15 min./107°C
Viscosity, cP @ 25˚C
2000
1800
1600
1400
1200
1000
800
600
400
200
0
4000 PP APP APA
Initial
2 Days
36 Days
57 Days

Additional Information
Visit us at:
www.kingindustries.com
King Industries, Inc - USA
Coatings Additives Division
Mr. Steve Knight
Science Rd.
Norwalk, CT 06852
Phone (203) 866-5551
Email: coatings@kingindustries.com
King Industries - Europe
Mr. Marcel Groenewoud
Noordake 64
2741 EZ Waddinxveen
The Netherlands
Phone: +31 182-631360
Email: mg@kingintl.nl
King Industries - Asia
Dr. Zhiqiang Alex He
42 Ju Lin Ya Yuan
Rich Mond Hill (Juhaoyuan)
Bo Ai 7th Road
Zhongshan, Guangdong,
China 528403
Phone: +86 760-88229866
Email: alex.he@kingindustries.com
The conditions of your use and application of our products, technical assistance and information (whether verbal, written or by way of product evaluations), including any suggested formulations and
recommendations, are beyond our control. Therefore, it is imperative that you test our products, technical assistance and information to determine to your own satisfaction whether they are suitable for your
intended uses and applications. Such testing has not necessarily been done by King Industries, Inc. ("King"). The facts, recommendations and suggestions herein stated are believed to be reliable; however, no
guaranty or warranty of their accuracy is made. EXCEPT AS STATED, THERE ARE NO WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS OR OTHERWISE. KING SHALL NOT BE
HELD LIABLE FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES. Any statement inconsistent herewith is not authorized and shall not bind King. Nothing herein shall be construed
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NACURE4000/Mar.2013