How to Use DMC Catalyst to Produce Polyether Polyols？
The DMC catalyst is double metal cyanide catalyst. Compared with similar polyols made using basic(e.g., KOH)catalysts, polyether polyols made from the catalyst have low unsaturations, narrow molecular weight distributions, have high molecular weight, and are useful in making a variety of polyurethane products. DMC catalyst is highly active in epoxide polymerization reactions used to prepare polyether polyols.
We can yield the DMC more than 20000 kg within one year, and thus afford to produce 50～70 ten thousand tons of polyols. This catalyst is white or light yellow powder, is suitable for preparation of polyols with 1~6 functions. Compared with basic catalysts, this catalyst can be used with less amount (30ppm), and reaction time of polymerization is reduced largely, and the polyols products are not necessary to be refined. The DMC is suitable for using in common epoxide polymerization reactors, but it can be better if reactors have both of stirring and cycling systems.
When using the DMC production period is short, thus the costs for production are reduced while the property of products are advanced.
Conditions wanted for initiators
1. polyethers with 1～3 0r more hydroxyl groups 2. molecular weight:for at least 2 hydroxyl groups---350~1000; for monols---with boiling point more than l00℃ 3. ∑Mn+ (mainly for K、Naions)≤5ppm 4. water content≤0.1% 5. acid value≤0.15mgKOH/g
Applying procedure
1. Weigh certain amount of initiator and the catalyst. The catalyst's amount is generally 30ppm relative to the product (it mainly refers to N220 with 2 hydroxyl groups and N330 with 3 hydroxyl groups). The amount of the catalyst can reduce if the molecular weight of products are relatively high, e.g. for N240, the amount can be 20～25ppm. 2. The mixture is stirred and is stripped under a vacuum with pressure less than l0 mm (Hg), and is heated to 130~145℃ to remove traces of water from the starter. Generally it needs more than 40min after the temperature rises to 130~145℃. 3. Propylene oxide (PO) or mixture of ethylene oxide (EO) and PO is fed to the reactor, under a pressure of 0.1—0.25Mpa. Additional PO or PO and EO is not added until an accelerated pressure drop occurs in the reactor (temperature can reach above 180℃,but this can not harm the activity of DMC or the properties of products). PO or PO and EO is added while maintaining a reactor pressure generally less than 0.1Mpa,temperature 140±10℃. 4. After PO or PO and EO addition is complete, the mixture is held at 140±5℃ until a constant pressure is observed. Residual unreacted monomer (generally only traces) is then stripped.
May 9, 2025Polyols are primarily derived from renewable resources such as vegetable oils (e.g., soybean oil, castor oil, palm oil), sugars, and other biomass. These raw materials are transformed into polyols thr...view
September 24, 2020Ethyl iodide cas no is a colorless and flammable compound. Its chemical formula is C2H5I, which is prepared by heating ethanol with iodine and phosphorus. When it comes into contact with air, especial...view
October 13, 2021Myristoyl Chloride also known as tetradecanoyl Chloride. It's a colorless liquid.The substance may be harmful to the environment and special attention should be paid to the pollution of water bodies. ...view
October 30, 2020Bronopol is a kind of highly effective and extensive preservative, which has the following obvious advantages:1. Bronopol at ppm concentration can effectively kill bacteria.2. It has multiple bacteric...view
October 13, 2021Benzyl bromide, is a benzene ring by bromomethyl bromide substituted aromatic compounds, chemical formula C7H7Br, in the presence of oxidizer it is obtained from toluene and bromine reaction, it is a ...view
March 4, 2021As time goes by, hair is inevitably damaged by external factors, resulting in changes to its physico-chemical properties. Damaged hair may feel dull, stiff, coarse, difficult to comb and prone to brea...view
Related Products
Specialty PU Elastomer 2
SystemWINNATE/WINCUREAdvantage·Low module, low stress·High rebound, high elongation·Good tear resistance·Constant hardness between -40~80℃Application·Applied to produce elastomer pad for NVH red...
ADC Monomer
Chemical Formula: C12H18O7
CAS No.: 142-22-3
Dangerous Grade: None
Polyether Polyol 12000
Product Name: Polyether Polyol 12000Chemical Formula: N/ACAS No.: N/ADangerous Grade: NOTechnical Data of Polyether Polyol 12000ITEMSSPECIFICATIONAppearanceTransparentColority(APHA)≤50Hydroxyl value...
