Preparation And Application Of Functional Additives Of Thermoplastic Resin

Plastic additives are dispersed in the molecular structure of the plastic which does not seriously affect the molecular structure of plastic.It can improve the performance of some defects in resin itself,therefore improve the processing properties and the use of plastic products.The use value of products was rasied and service life was prolonged.Besides,it also give plastic substrate some new performance.A variety of plastic additives,this article has conducted the research to multi oxazolinyl macromolecular chain extender,etching anhydride modified fiber toughening agent,titanium dioxide photocatalyst preparation and role in resin.The phthalic anhydride was used to etching aramid fiber(AFs)to improve the interface bonding ability with the resin.At the same time phthalic anhydride,the etching agent,is also a kind of chain extension agent which could improve the characteristics of fiber/resin composite materials viscosity.The experimental results showed that the surface roughness and surface oxygen levels of AFs increased gradually as the extension of etching time.Compared with the pure R-PET,AFs/R-PET composite materials were easier to crystallization.The viscosity of the AFs/R-PET composites was the largest when the AFs was etched for 6 h which was reached 0.9343 dL·g-1.The bending strength and impact strength of the AFs/R-PET composites were greatly improved which were respectively 107.23 MPa and 10.49 kJ·m-2 when the added AFs was etched for 6 h.The comprehensive mechanical properties of the composite materials were the best.Iron doped TiO2 microspheres were synthesized by hydrothermal method of which titanium fluoride(TiF4)was used as the titan source and(Fe(NO3)3)was used as the doping precursors.The composite of Fe-TiO2 and R-PET were blended by the extrusion machine and the film blowing machine.The photocatalytic activity of the composites was evaluated by the photocatalytic degradation of methylene blue(MB).The results showed that the TiO2 microspheres were all anatase which generated at 160℃ in aqueous solution and the iron doped did not affect the morphology and crystal structure of the microspheres.Besides,iron doping could significantly improve the catalytic activity of TiO2 microspheres and the highest catalytic activity of iron and titanium ratio is 1.5:100.R-PET film modified by the Fe-TiO2 showed a low transparency but a great self-cleaning property.The acrylic monomer containing oxazoline group was synthesized by acrylic acid chloride and 2-p-hydroxyphenyl-2-oxazoline through esterification reaction.The ammonium persulfate was used as initiator to initiate the monomers polymerization into macromolecule chain extender(POXA)with multi-oxazoline groups.The results showed that POXA was a good chain extender of R-PET.The intrinsic viscosity of R-PET increased and then decreased with the increase of POXA content.The MFR of R-PET had a rapid decrease of the addition of POXA but was not obvious after a further increase in the amount of chain extender.It is proved that chain extender is an effective chain extending method,POXA and PMDA have certain synergistic effect.