Research On The Resource Modification Of Waste Textile Fiber And Its Application In Filled Polyolefin

In the light of the present situation of complex components, difficult separationand low resource level of waste textile products in our county, this thesis offers abrand new resource way for waste textile fiber. That is, the soft waste textileproducts were firstly harden by reactive monomer through the thermopolymerizationmethod, and then cut into particles to use as filler for polyolefin composites. Theresource modification technology of waste textile fiber and its application in filledpolyolefin composites were studied as follows:1. The transformation of soft waste textile products to harden particles wasachieved by treating them with reactive monomer through thermal polymerization.The optimal technological conditions for pelletizing the waste textile products wereexplored.2. The structure and properties of polypropylene(PP) composites filled withwaste dacron (PET) textile, nylon(PA) textile and cellulose textile treated the abovemethod were studied respectively. The results showed that, the pelletized wastetextile could disaggregate into single fiber in PP resin after melt compounding, andthis fiber exhibited the heterogeneous nucleation effect to the PP crystallization.Moreover, PET textile fiber had slightly β nucleation effect. The composites filledwith PA textile fiber had better tensile and impact properties comparing with otherfilled PP composites, while the flexural properties was inferior. The addition ofwaste textile fiber affected slightly on the thermal stability of PP composites, but itcould enhance the heat deflection temperature.3. The effect of particle size of hardened waste textile fiber on the properties ofcomposites was studied. It found that with particle size increased, the tensileproperties of PP composites improved, while the flexural and impact propertiesdecreased. Moreover, the composites, which filled with the hardened textile fiberwith the size of4mm×4mm, had the best combination properties.4. The effect of the two kinds of macromolecular compatibilizer on theproperties of PP composites filled with hardened waste textile fiber was studied. The results showed that PP-g-MA could commendably improve the compatibilitybetween PET fiber and PP resin and enhance the mechanical properties of materials.5. A serial of β-nucleated polypropylene (β-PP)/nano-calcium carbonate(nano-CaCO3)/waste PET fiber ternary composites were further prepared. Therelationships among components, structure and properties of the PP composites werestudied. The results show that adding nano-CaCO3improved the mechanicalproperties of the materials. Adding PET waste textile fiber increased the rigidity andtoughness, but decreased the tensile strength of the composites. Both PET fiber andnano-CaCO3exhibited the nucleation effect on the PP crystallization and slightlyinduced the formation of PP β crystals. Mo’s method could satisfactorily describe thenonisothermal crystallization behavior of ternary composite.