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[Chemical Knowledge]：Production process and preparation method of polymer polyol POP

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POP(Polyol Oligomer Polymer) is a high-performance, environmentally friendly synthetic material, widely used in automotive, building materials, home, electronics and other fields. This article will focus on the production process and preparation method of polymer polyol POP.

1. polymer polyol POP production process

polymer polyol POP production process includes the following links:

1. raw material preparation

preparation of polymer polyol POP raw materials are mainly benzoyl chloride and polyether polyol. Polyether polyols can be replaced by polyether glyceryl ether, polyether acrylate and other materials.

2. Polymerization

Benzoyl chloride and polyether polyol are put into a reaction kettle, and a basic catalyst such as phosphorus pentoxide (P2O5) or triphenylphosphine (TPP) is used as a catalyst for polymerization. The reaction temperature is generally about 130°C and the reaction time is about 4 to 8 hours.

3. Discharge of Reaction Product
After the
reaction, the polymer polyol POP is discharged from the reactor to remove the residue.

4. Post-treatment

polymer polyol POP needs to be post-treated before it can be used. Post-treatment mainly includes neutralization, cleaning and drying.

2. polymer polyol POP preparation method

1. Polyether polyol and benzoyl chloride direct polymerization method

This method is to put polyether polyol and benzoyl chloride directly into the reaction kettle for polymerization. The method is simple, but the molecular weight distribution of the polymer polyol POP is wide.

2. Polyether polyol and benzoyl chloride prepolymerization method

This method is to pre-mix polyether polyol, benzoyl chloride and triacetamide and other additives after reaction. The prepolymer is heated and polymerized in xylene, and then the second polymerization is carried out to prepare the polymer polyol POP with a narrow molecular weight distribution.

3. Polyether Polyol and Benzoyl Chloride Crosslinking Polymerization
This method is
by adding a crosslinking agent, such as bis (2-hydroxyethyl) formate or a polycarboxylic acid, in the polymerization reaction. This method can prepare polymer polyol POP with narrow molecular weight distribution and improve the mechanical properties of the product. The production process and preparation method of

polymer polyol POP have their own advantages and disadvantages, and it is necessary to adopt appropriate methods for preparation according to specific needs. In the future, the application of polymer polyol POP in environmental protection materials, high-performance materials and other fields will have a wider range of development.