Liquid phase synthesis method of high isotactic polybutene-1

Abstract

The embodiment of the invention provides a liquid phase synthesis method of high isotactic polybutene-1 and belongs to the field of high-molecular polymer synthesis. With adoption of the liquid phase synthesis method of the high isotactic polybutene-1, a polymer with reasonable molecular weight distribution can be acquired according to the principle of reaction kinetics while the subsequent separation energy consumption is reduced. The liquid phase synthesis method of the high isotactic polybutene-1 comprises the following steps: adding a butane-1 monomer, a supported titanium catalyst, a cocatalyst, and mixed liquid of an electron donor and an inert solvent in a loop reactor sequentially, taking hydrogen as a molecular weight regulator and inert gas as a pressure regulator in the loop reactor, carrying out programmed temperature increasing within a preset temperature range under the condition of enabling the reaction pressure in the whole loop reactor to keep in a preset pressure range by regulating the partial pressure ratio of the inert gas, carrying out constant-pressure reaction for 1-4h, carrying out flash evaporation to remove the unreacted monomer, and obtaining the powdery high isotactic polybutene-1. The liquid phase synthesis method can be used for industrial production of the high isotactic polybutene-1.

Description

technical field

[0001] The invention relates to the field of polymer synthesis, in particular to a liquid phase synthesis method of high isotactic polybutene-1. Background technique

[0002] Isotactic polybutene polymer is a semi-crystalline polymer with butene-1 as a monomer, which naturally has physical properties similar to polyethylene and polypropylene polymers, and its outstanding creep resistance As well as the good mechanical properties displayed under heated conditions, it has unique advantages in the application of hot and cold water pipes, floor heating pipes, and packaging films.

[0003] The traditional synthesis methods of isotactic polybutene-1 can be divided into gas-phase method and liquid-phase method. The gas-phase method is usually carried out with a gas-phase ebullating bed, but the gas-phase ebullating bed has high requirements for technology and equipment, and when solving the main problems affecting the reaction, the flow field and the size of the bu...