Double Metal Cyanide Complex (DMC)

Product Description

Chemical structure:

Zn3〔Co(CN)6〕2·aZnCl2·bH2O·ctert-Butyl alcohol

Chemical name: Zinc hexacyanocobaltate tert-butanol chelate

DMC Catalyst is a cutting-edge catalyst for oxidized olefin ring-opening polymerization, tailored for the synthesis of oxidized olefin polyethers with 1-6 functional groups as initiators. In comparison to alkali catalysts, utilizing DMC Catalysts for polyether production presents several advantages:

1.Reduced Production and Operational Costs:

• Eliminates the need for post-processing procedures, resulting in accelerated reaction speeds and a significant increase in device production capacity.
• By omitting post-processing steps, there is a decrease in equipment investment, energy consumption, water usage, solid waste, and wastewater production per unit product, leading to enhanced product yield.

2.Enhanced Product Properties:

• Facilitates the production of higher molecular weight polyethers, with a molecular weight per hydroxyl group exceeding 2000.
• Yields polyethers characterized by narrow molecular weight distribution, reduced by-products, low unsaturation levels, and minimal odor.

3.Improved Properties in PU Applications:

• When applied in the PU domain (elastomers, soft foam, high-resilience foam, coatings, sealants), significant enhancements are observed in various properties such as tensile strength, elongation, and pressure resistance.

Physical Properties

Guideline for use

       1.Conditions of starter

• Hydroxyl-containing compounds: Monoalcohols – fatty alcohols with a boiling point exceeding 100°C, monoalcohols partially modified with propylene oxide or ethylene oxide. Other monoalcohols may be utilized as long as they effectively eliminate water. Polyols – including (iso)propylene glycol, glycerin, or other propylene oxide polyethers derived from small molecules with three or more valences, propylene oxide/ethylene oxide copolyethers, fully ethylene oxide polyethers, tetrahydrofuran polyethers, tetrahydrofuran/propylene oxide copolyethers, etc. Phenols encompass monophenols and bisphenols. Users have a broader choice of alcohols or hydroxyl-containing compounds as initiators, such as fatty dihydric alcohols, unsaturated mono- and dibasic alcohols, polyester polyols, etc. In essence, the examples provided in this manual serve as guidelines.
• Molecular weight range: Polyol- 350~1000 or higher molecular weight.
• ∑Mn+ (mainlyrefers toK, Na ions) ≤ 5ppm
• Water content ≤ 0.1%
• Acid value ≤ 0.15mgKOH/g

2. Operation

• Rinse the reactor thoroughly with deionized water to eliminate K+ ions and prevent catalyst deactivation.
• After vacuum-drying the reactor, introduce the initiator (low molecular weight polyether with K+ content ≤ 5ppm), catalyst, and phosphoric acid. Use 35-40ppm (final product) of catalyst and 30ppm (final product) of phosphoric acid. Bubble ammonia gas for 1 hour (preferably under vacuum), ensuring the oxygen content is ≤0.015%.
• Once the reactor temperature reaches 130°C-140°C, add a specific amount of PO (or PO/EO) to raise the reactor pressure to 0.2-0.45Mpa. As the pressure drops significantly, gradually add the remaining PO (or PO/EO). Maintain the reaction temperature at 135°C-145°C for 1 hour.

Note: Control the feed rate to prevent rapid temperature fluctuations during the initial stage of the reaction.

Package 

Net weight 250g*2/bag or according to customer specifications.

Shelf life

12 months from the date of production under unopened original packaging.

Storage

Please store in a dry place at a temperature of 25±10 ℃, and avoid exposure to direct light and direct heat.