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Blocked Isocyanates

DESCRIPTION

Leeson Polyurethanes Ltd. produce a range of blocked isocyanate systems. The range aims to overcome some of the limitations with traditional PU technology, namely:

TRADITIONAL LIMITATIONS OF PU TECHNOLOGY

  • Stability in 1K systems
  • Pot life restrictions in 2K systems
  • Sensitivity to moisture, both ambient and trace levels in raw materials
  • Increasing concern regarding free isocyanate levels in systems

BENEFITS OF LEESON’S BLOCKED ISOCYANATE RANGE

  • A range of blocking agents available to give different unblocking temperatures
  • Aliphatic based technology, giving excellent UV colour stability
  • Flexible Formulation approach, offering tailored solutions to customers
  • Products compatible with polyester, urethane and acrylic resins
  • Range of DMP based technology offers lower unblocking temperatures
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PRODUCT SPECIFICATIONS

Product: Leeson Blocked Isocyanates – 1 Component

TYPICAL APPLICATIONS

OEM – coil coating; automotive coatings; electrostatic coatings; white goods.

PRODUCTS INCLUDED IN THIS SYSTEM

Range of products depending on the customers’ requirements

Detailed guidance available on request.

IMPORTANT NOTE

Leeson Polyurethane’s products are guaranteed against defective materials and manufacture and are sold subject to its standard Terms and Conditions of Sale, copies of which can be obtained on request.

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Download Datasheet
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 PRODUCT RANGE OVERVIEW

PROPERTY
PU5207
PU5208
PU5209
PU5210
PU5211
PU5364
PU5429
PU5614
PU5615
PU5616
Appearance
Clear straw liquid
Clear straw liquid
Clear straw liquid
Clear straw liquid
Clear straw liquid
Clear straw liquid
Clear straw liquid
Clear low viscosity liquid
Clear low viscosity liquid
Clear low viscosity liquid
Viscosity at 25˚C (mPa.s)
≤1000
900 – 1300
2050 – 2450
3200 – 3800
1300 – 1500
1000 – 1400
1000 ± 500
<1000
<200
<1000
Density at 25˚C (g/cm³)
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
1.0 – 1.1
Solids content (%)
68 – 72
68 – 72
68 – 72
63 – 73
68 – 72
63 – 67
68 – 72
38 – 42
38 – 42
38 – 42
Isocyanate type
HMDI Trimer
HDI Biuret
HDI Biuret
IPDI Trimer
HMDI Trimer
IPDI Monomer
HDI Biuret
HMDI Trimer
HMDI Trimer
HMDI Trimer
 

Solvent
1-Methoxy-2-
Propanol
1-Methoxy-2-
Propanol
Naphtha B
Naphtha B
Butyl acetate
1-Methoxy-2-
Propanol
1-Methoxy-2-
Propanol
1-Methoxy-2-
Propanol
Water
Water
Water
Flashpoint
– closed cup (˚C)
31
31
48
22
31
31
31
N/A
N/A
N/A
Boiling point (˚C)
120
120
135
126
120
120
120
N/A
N/A
N/A
Apparent % NCO
(as supplied)
10.12
10.2
10.2
7.9
10.5
7.46
8.94
4.0
5.1
4.8
Apparent eq. wt.
(as supplied)
415
410
410
530
400
563
470
1056
826
875
Blocking agent
3,5-dimethylpryazole
3,5-dimethylpryazole
3,5-dimethylpryazole
3,5-dimethylpryazole
Methyl ethyl Ketoxime
3,5-dimethylpryazole
Diethyl malonate
Dimethyl-pyrazole
Dimethyl-pyrazole
Dimethyl-pyrazole
Application
Automotive
& Coil Coating
Coil
Coil & Electrostatic
Automotive
& Coil Coating
Automotive
& Coil Coating
Automotive
& Coil Coating
Automotive
& Coil Coating

FURTHER INFORMATION

The Leeson Polyurethane range includes 4 blocking agents, allowing customers to choose the temperature (and also the isocyanates), they wish to use. Detailed below are the 4 blocking agents used within our range.

 

Blocking Agent
Unblocking Range (°C)
 Diethyl malonate (DEM)100-120
Dimethyl pyrazole (DMP)110-120
Methylethyl ketoxime (MEKO)140-160
ε-Caprolactam (ε-CAP)160-180

 

HOW DOES THE TECHNOLOGY WORK?

During manufacture, we react the blocking agent onto the isocyanate.  This gives an inert and non hazardous material, at standard ambient temperatures.

The blocked isocyanate can be compounded into suitable coating systems, which are applied and dried.  Once cured at the correct unblocking temperature, the isocyanate is able to react with the functional co-binder polymer, to give a final cross linking cure.

FOR MORE INFORMATION

To ensure you are specifying a fit for purpose system for your application please consult our Area Sales Manager for your area or visit our website.