Application and Classification of Polyether Polyol

Polyether polyol is mostly used to manufacture soft, hard and semi-rigid polyurethane foams. Polyether polyol is not only easy to obtain raw materials with low cost, but also hold good properties of synthetic polyurethane foam.It is the polyol raw material with the largest dosage for polyurethane foam industry.

1. Polyether polyol for soft foam

Polyether polyol used for soft foam is generally long-chain polyether with low functionality. The functionality of polyether polyol in soft foam formula is generally 2 ~ 3, and the average molecular weight is between 2000 ~ 6500. Polyether triol is the most commonly used in soft foam. Generally, glycerin (glycerol) is used as RXH, which is obtained by ring-opening polymerization of 1, 2-propylene oxide or copolymerization of propylene oxide with a small amount of ethylene oxide. The molecular weight is generally in the range of 3000 ~ 7000. Glycerin are mainly used soft foam with high resilience, and can also be used in foam products such as semi-hard foam. This kind of polyether has good miscibility with water and isocyanate, the reaction activity is suitable, and the foam process stability is greatly improved. In addition, the foam curing time is shortened, which also reduces the production cost.

2. Polyether polyol for hard form

Polyether polyol with high functionality and high hydroxyl value is commonly used in hard foam formulations,only in this way can a sufficient degree of cross-linking and rigidity be produced. The hydroxyl value of hard foam polyether polyol is generally 350 ~ 650mg KOH/g, and the average functionality is above 3.

3. Elastic non-foam polyurethane material

As for ordinary polyether polyol used in elastic non-foam, polyurethane polyether glycol and polyether triol with molecular weights ranging from 1000 to 3000 are most commonly used. In addition, sealant also uses the high molecular weight polyether triols and coatings also use polyether polyol with a molecular weight of several hundred.

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Polyether Polyol Manufacturing ProcessPolyether Polyol Manufacturing Process

Synthesis of DMC-based polyether polyol by a continuous method A certain amount of DMC catalyst is taken and uniformly dispersed in a certain amount of small molecule initiator. Add 0.5 kg of the mixture of the initiator in the small test reactor. The vacuum was replaced 1-2 times with N2, and the N2 pressure was maintained at 0.1 MPa. After heating, stirring and raising the temperature to a certain temperature, the quantitative PO was introduced into the continuous autoclave with nitrogen gas for induction. When the induction is successful (the temperature in the kettle rises and the pressure drops), the PO is continuously passed to carry out the reaction. Open the outer loop and continue to pass the PO into the continuous kettle. When the liquid in the reaction vessel is full, the PO, DMC catalyst and the initiator are continuously added to the kettle at a certain ratio and a certain speed through the power system. Continuous discharge is started when a certain pressure is reac

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