Name: Blocked Isocyanate Crosslinker BI-3000 (Methyl Ethyl Ketoxime-blocked)
Brand: Coatingsink
SKU: blocked-isocyanate-bi3000
Availability: InStock

Question 1

How does a blocked isocyanate enable 1K (one-component) thermosetting PU coatings?

Accepted Answer

Blocking an isocyanate with a blocking agent such as methyl ethyl ketoxime (MEKO) temporarily deactivates the NCO group. At room temperature the blocked isocyanate is stable and can be formulated with a polyol in a single-package system. When the coating is heated to the deblocking temperature (140–160°C for MEKO), the blocking agent is released, regenerating free NCO groups that then crosslink with the polyol to form a fully cured, durable PU network.

Question 2

What are the advantages and limitations of MEKO-blocked versus caprolactam-blocked isocyanates?

Accepted Answer

MEKO-blocked crosslinkers like BI-3000 deblock at 140–160°C, enabling lower energy curing and good compatibility with most polyol resins. Caprolactam-blocked systems typically require 170–190°C but release a less volatile blocking agent and are preferred where MEK-oxime emissions must be minimized (e.g., can coatings with food contact). The choice depends on cure temperature window, regulatory requirements and substrate tolerance.

Appearance	clear to pale yellow liquid
Solid Content	75±2%
Deblocking Temperature	~140–160°C
NCO Content (unblocked)	14.0–15.5%
Viscosity (25°C, 75% in BA)	800–2000 mPa·s

Blocked Isocyanate Crosslinker BI-3000 (Methyl Ethyl Ketoxime-blocked)

Specifications

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