Characteristics of solution polymerization
The viscosity of the polymerization system is lower than that of the bulk polymerization, the mixing and heat dissipation are relatively easy, the production operation and temperature are easy to control, and the evaporation of the solvent can be used to eliminate the polymerization heat. In the case of free radical polymerization, an automatic acceleration effect may not occur when the monomer concentration is low, thereby avoiding explosive polymerization and simplifying the design of the polymerization reactor. The disadvantage is that for radical polymerization, the yield is often low, and the degree of polymerization is smaller than other methods. The use and recovery of a large number of expensive, flammable, and even toxic solvents not only increase production costs and equipment investment, reduce equipment production capacity, but also cause the environment Pollution. If solid polymer is to be prepared, it is necessary to configure separation equipment and increase the steps of washing, solvent recovery and purification. Therefore, in the industry, solution polymerization is used only when it is difficult to use other polymerization methods or directly use a polymer solution.
advantage:
The polymerization heat is easy to diffuse and the polymerization reaction temperature is easy to control; it can be directly finished in solution; the materials are easy to be transported after the reaction; the low molecular substances are easy to remove; the automatic acceleration phenomenon can be eliminated. Aqueous solution polymerization uses water as a solvent, which is very beneficial to environmental protection.
Disadvantages:
The monomer is diluted by the solvent, the polymerization rate is slow, and the molecular weight of the product is low; the solvent is consumed, the solvent is recycled, the equipment utilization rate is low, and the cost is increased; the use of the solvent causes environmental pollution problems