Study On The Dyeability Of Modified Fine PP Fiber With Organic Nanoparticles

With the rapid growth of the global population, natural crop, such as natural cotton, are not enough to meet the increasing need of people, so the synthetic fibers generally take the place of the natural fibers. Polypropylene(PP) fiber, a unique and excellent synthetic fiber materials , is widely popularized because of its good mechanical properties, especially the fine denier fibers of PP ,which also have excellent ventilation property, warmth retention property, and bacterinertness. However, with the people’s stilling pursuing of aesthetics, the new demands come out .One of the difficulties, which prevents PP from fulfilling the new demands, is its bad dyeing ability.The latex were prepared by micro-emulsion polymerization, then using Dynamic light scattering (DLS), transmission electron microscope (TEM) to test the structure and size. After freeze drying of the micro-emulsion, the nanoparticles were obtained. Then, we blended the PP resin with the nanoparticles to prepare the complex PP resin, and put the complex resin into the melting spinning machine to make modified PP fibers. After all the above process, some properties, such as the degree of orientation, micro-structure, crystallization, hydrophilic nature property, mechanical property and etc, were tested. Finally, the modified PP fibers were dyed and then tested its dyeing ability. All the results of this research are listed in the article.The size of all the organic particles , which were prepared by micro-emulsion polymerization, are less than 100nm under the DLS test, and their PDI are also less than 0.5, so the result can be true. And then, under the direct observation via TEM, we can also see the same-sized latex dispersing averagely. After those tests, the micro-emulsion was freezing dyed, and then pressed into film to make Dynamic Mechanical Analyzer (DMA) test. After this test, the glass transition temperature of all synthetic particles were obtained ,which basically match the glass transition temperature designed before, and this result provided favorable condition for the dyeing process later. From the Photo taken under Scanning Electron Microscope (SEM), we can get the conclusion that the compatilizer increased the compatibility of organic particle and PP. With the test of rheology property, we also know that the 3#particle/PP/PgM composite system has the best rheology behavior.Through the research of Crystallization behavior of modified PP, it is concluded that the additive has little effect on PP’s crystallization behavior, but has an obvious effect on the mechanism of nucleation and growth pattern.According to the test before, we selected some good sample to do the spinning process, during this process, some of the composite system had bad performance, and others performed well. The 3#particle/PP/PgM, 4#particle/PP/PgM and 7#particle/PP/PgM had also reached the standard of fine denier fibers. Then we also detected the best additive amount, and ensure 5% was the proper amount.With the test of orientation degree, we know that the orientation degree of modified PP fibers is less than neat PP fibers’, and its orientation degree will increase rapidly, but with the decreasing mechanical properties after drafting process, only 3#particle/PP/PgM and 7#particle/PP/PgM performed a little better than others. What’s more, compared with the neat PP fibers, the polarity and hydrophilicity of modified PP fibers has been improved a lot, which attribute to the better combination of modified PP and disperse dye.Finally, we used the fiber to do the dyeing process, and all the fibers can be dyed into deep color. After the direct observe and the Quantitative Test, we get the conclude that compared to other modified fibers, 3# fiber has better dyeing ability because of the higher rate of dye-uptake towards RGB Disperse dye. It can attribute to the uniformly dispersion of 3#particle in PP matrix, which played the key role of dyeing seat. It can be proved that the new modified PP fibers we prepared can match the demand of the fine denier property and the dyeability of PP fibers, which is a breakthrough in this field.