Name: 1,6-Hexanediol (HDO)
Brand: Coatingsink
SKU: 1-6-hexanediol
Availability: InStock

Question 1

Why is 1,6-hexanediol preferred over shorter-chain diols in polyurethane coatings?

Accepted Answer

The six-carbon chain of HDO balances crystallinity and flexibility that shorter diols cannot achieve. In polycarbonate diol (PCDL) synthesis, HDO reacts with diphenyl carbonate to yield a product with crystalline-to-amorphous transition near ambient temperature, giving PU coatings excellent low-temperature flexibility down to -40 degC while maintaining high hardness at 23 degC. Waterborne PU dispersions built on HDO-PCDL show superior hydrolysis resistance vs. polyester-based WPU because carbonate linkages resist hydrolytic chain scission.

Question 2

What is the role of 1,6-hexanediol in UV-curable urethane acrylate oligomers?

Accepted Answer

HDO reacts with MDI or IPDI and hydroxyethyl acrylate to form hexamethylene urethane diacrylate, a low-viscosity bifunctional monomer used as a reactive diluent in UV coatings. The six-carbon soft segment provides flexibility and elongation in the cured film. In wood UV lacquers, 5-15% HDO-urethane acrylate improves crack resistance under thermal cycling without sacrificing hardness.

Question 3

What are the storage and handling requirements for 1,6-hexanediol flakes?

Accepted Answer

1,6-HDO melts at 41-43 degC. Store below 30 degC in a cool, dry warehouse to prevent caking; the product is mildly hygroscopic. For liquid handling, heat to 50-60 degC using hot water or low-pressure steam tracing. Avoid overheating above 80 degC to prevent color formation. Compatible with carbon-steel equipment.

Purity	>=99.5%
Appearance	white crystalline flakes/pellets
Color (APHA)	<=10 (melt)
Boiling Point	250 degC (760 mmHg)
Functionality	2 (primary OH)
Melting Point	41-43 degC
Water Content	<=0.05%
Hydroxyl Value	~950 mgKOH/g
Molecular Weight	118.17 g/mol

1,6-Hexanediol (HDO)

Specifications

FAQ

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