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Blocked Isocyanates

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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.


Download Datasheet
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 PRODUCT RANGE OVERVIEW

Product Reference
Isocyanate Type
Blocking Agent
Viscosity@23C, mPa.s
Equivalent Weight
Solids (%)
Solvent
Application
PU5210
IPDI Trimer
DMP
3,500
539
65
C9 Aromatic
Automotive and Coil Coating
PU5208
HDI Buiret
DMP
1,100
410
70
PM/EA
Coil
PU5209
HDI Buiret
DMP
2,250
410
70
C9 Aromatic
Coil and Electrostatic
PU5207
HDI Trimer
DMP
600
410
70
PM
Automotive and Coil Coating
PU5211
HDI Trimer
MEKO
1,400
400
70
PM
Automotive and 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.