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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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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- | 1-Methoxy-2- | Naphtha B | Naphtha B | 1-Methoxy-2- | 1-Methoxy-2- | 1-Methoxy-2- | 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 | Coil & Electrostatic | Automotive | Automotive | Automotive | Automotive |
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.
