Polyethylene-polypropylene Glycol CAS 9003-11-6

The polyether polyol utilized for adaptable foam are normally lengthy chain, low functionality polyethers. The capability of polyether polyol in the soft foam formulation is generally 2 to 3, as well as the ordinary molecular weight is in between 2000 and also 6500. The most pre-owned polyether triol in soft foam is typically glycerol (glycerol) as the initiator, which is gotten by the ring-opening polymerization of 1,2-propylene oxide or the copolymerization of propylene oxide and a small amount of ethylene oxide. Gotten, the molecular weight is generally 3000-7000. Polyether diols can be used as auxiliary raw materials to be combined with polyether triols in soft foam solutions. The soft foam polyether with the biggest quantity in the beginning is polyoxypropylene triol with a molecular weight of about 3000. The incurable hydroxyl teams of such polyethers are primarily second hydroxyl teams with low sensitivity. Later on, PO and EO copolyethers have basically been made use of. Polyethers with molecular weights of 3000-3500, containing a percentage of ethylene oxide chains and key hydroxyl groups are made use of for average thermal healing soft foams; polyethers with molecular weights of 5000-6500 and also high material of key hydroxyl teams (more than 70% in mole fraction) are commonly known as “high” Reactive polyether” is generally made use of for high-resilience soft foam, yet likewise for semi-rigid foam and various other foam products. This kind of polyether has great miscibility with water as well as isocyanate, suitable sensitivity, as well as significantly enhanced foam procedure stability. Additionally, the foam treating time is shortened, which also decreases the manufacturing expense.

Over the last few years, double steel cyanide complicated (DMC) catalytic systems have actually been utilized to create low unsaturation, high molecular weight polyether polyol at home as well as abroad. The high molecular weight polyether polyol created by this brand-new catalytic polymerization system has a molecular weight of even more than 10,000 and a slim molecular weight circulation range, which can be used for the production of soft foam and also minimize the amount of TDI.

High-functionality, high-hydroxyl value polyether polyols are typically made use of in inflexible foam formulas to give appropriate crosslinking as well as rigidness. The hydroxyl worth of the inflexible foam polyether polyol is normally 350-650 mg KOH/g, and also the ordinary capability is above 3. The basic hard foam formula is mostly utilized in a mix of two sort of polyethers, and also the typical hydroxyl worth is about 400mg KOH/g.

The polyether polyol with fragrant diamine compound as the beginning representative has faster curing in the later stage of frothing, and also the resulting foam has high strength and also reduced thermal conductivity. The cost of the initiator has a terrific impact on the manufacturing price of polyether polyol. Based upon cost factors, the majority of the general-purpose stiff foam polyether polyols utilize sucrose and also its mixtures as the beginning representative. Semi-rigid foam formulas usually make use of part of high molecular weight soft foam polyether, specifically high reactive polyether polyol, as well as part of high practical reduced molecular weight rigid foam polyether.

Polyurethane materials, including polyurethane water resistant coatings, flexible polyurethane plastic paths, polyurethane elastomers, polyurethane dipped layers, polyurethane adhesives, and polyurethane sealers, are commonly called situation products in the polyurethane sector according to the English abbreviation. Common polyether polyols made use of in CASE materials are polyether diols and polyether triols with molecular weights in the variety of 1000-3000. In addition, high molecular weight polyether triols are additionally made use of for sealers, and polyether triols with molecular weights of a number of hundred are likewise used for layers. ether polyols.

The low-unsaturation, medium- and also high-molecular-weight polyether manufactured by the new catalyst has a narrow molecular weight circulation and a functionality near the academic value. On the basis of low-unsaturation polyoxypropylene polyol, by adding ethylene oxide, high-performance polyether diols as well as triols with high primary hydroxyl material can be prepared, which are used in polyurethane microcellular elastomers, sealants, adhesives Agents, finishings as well as other fields. Compared with ordinary polyethers, the buildings of polyurethane products made from low-unsaturation polyether polyols such as strength and elongation are enhanced.