Preparation And Properties Of Amine-based Functional Ploymer Porous Composites

The greenhouse effect caused by CO2 has attracted wide attention from governments around the world.Amine-based functional solid adsorbent materials have many advantages such as energy saving in CO2 separation,and have good development prospects.In this paper,two spherical polymer porous matrix materials were prepared by emulsion suspension polymerization.After functionalization with amine groups,new materials with high CO2 adsorption performance and good cycle stability were obtained.The main research contents include:(1)Using styrene as the monomer,combined with emulsion polymerization and suspension polymerization to prepare spherical adsorbent materials.By adjusting the volume fraction of the dispersed phase of the emulsion,the stirring speed of the third phase and the high-speed stirring conditions,polystyrene materials with good sphericity and uniform pore structure were prepared.(2)Adopt physical impregnation method to perform functionalization of amine group on spherical polystyrene adsorbent.The test results show that the adsorbent loaded with 50 wt.%polyethyleneimine(PEI,Ms=1800)has the best adsorption performance.At this time,the CO2 adsorption capacity of the material is 3.45 mmol/g and the working adsorption capacity is 2.35 mmol/g.However,its cycle stability performance is poor.After 50 adsorption/desorption cycles,the adsorption capacity of the material decreased from 2.35mmol/g to 2.095 mmol/g,a decrease of 10.8%.(3)Using n-butyl methacrylate as the monomer,based on oxidation-reduction initiation,emulsion suspension polymerization was used to prepare a polyacrylate spherical adsorbent material,impregnated with epoxy-modified tetraethylenepentamine.Tests show that when the load is 50wt.%,the material has good CO2 adsorption performance,cycle stability and thermal stability performance at this time,the material CO2 adsorption capacity is 2.3 mmol/g,working adsorption capacity is 1.8 mmol/g,After 50 absorption/desorption cycles,the working adsorption capacity decreased from 1.8 mmol/g to 1.7 mmol/g,only a decrease of 5.5%.The material began to decompose at 250?,and it can be stable in the range of use temperature(50?-120?).(4)In order to further simplify the preparation method,a one-step method was used to prepare spherical poly-n-butyl methacrylate adsorption material containing modified tetraethylenepentamine.Tests show that after loading 35 wt.%modified tetraethylenepentamine,the material has the best CO2 adsorption performance,cycle stability performance and thermal stability performance.At this time,the material CO2 adsorption capacity is 2.0 mmol/g and the working adsorption capacity is 1.6 mmol./g,the working adsorption amount of the material in the 50 suction-desorption cycles only decreased by 3.2%.The material began to decompose at 250?,and it can exist stably in the range of use temperature(50?-120?).(5)Using industrial-grade raw materials to amplify the experiment of preparing one-step spherical poly-n-methacrylate adsorption material.The test showed that the pore structure,CO2 adsorption performance and cycle stability performance of the scaled-up experimental samples all decreased significantly,which indicated that the large-scale industrial production of the amine-based poly-n-butyl methacrylate adsorption material still needs further improvement.