Advantages: simple production process, short process, less production equipment and less investment; The reactor has the advantages of large effective reaction volume, large production capacity, easy continuous operation and low production cost. Disadvantages: the thermal effect is relatively large, and the automatic acceleration causes the product to blister and change color. In severe cases, the temperature is out of control, which leads to explosive polymerization, and the product is more difficult to meet the standard. Because the viscosity of the system increases with polymerization, mixing and heat transfer become difficult. In the case of free radical polymerization, sometimes the polymerization speed will automatically increase, and if it is not properly controlled, it will lead to explosive polymerization. The molecular weight distribution of the product is wide, the unreacted monomer is difficult to remove, and the mechanical properties of the product are poor.