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Polyester fiber for its excellent performance, with a wide range of applications and industries. But belongs to melt combustible fiber polyester fiber, easy to form a droplet combustion, droplet easy to bring, including burns and other secondary damage, modified polyester fiber, to improve its anti-droplet performance has become a hot research. Anti-droplet research mostly add anti-droplet additives (such as PTFE, nanoparticles, etc.) with a polyester matrix blending, or take advantage of copolymerization, but basically there are spinning difficult or add less ineffective. Check this paper put forward the idea of the formation of a small amount of thermosetting resin PET fiber anti-droplet modified, specific method is to add a plastic-substances - Benzoguanamine (BG) in the PET substrate prepared by blending PET / BG blend fibers, and then spun out of a blend of fibers in the formaldehyde solution for processing, BG and formaldehyde reaction to generate three-dimensional mesh of a thermosetting resin, the protection of the resin, quick combustion carbonization and increase the carbon content, Acting dropwise played adsorption, in order to achieve the purpose of anti-droplet. In this paper, the melt flow rate instrument and RH-7 capillary rheometer EDS, titration, SEM, FTIR, XRD, TG, DSC, oxygen index (LOI) and anti-droplet test by means of PET / BG total structure and performance of the migration of the rheological properties and BG, BG and formaldehyde reaction characteristics as well as fiber blend. The main contents and conclusions include: (1) using the the melt rheology rate instrument and RH-7 type capillary rheometer PET, PET / BG blends melt rheological properties of the test results showed that the PET / BG. blend melt index increases with increasing the content of BG; apparent viscosity gradually decreases as the temperature increases and the increase in shear rate, melt performance characteristics of pseudoplastic fluids; different temperatures, a non-Newtonian index n gradually increases with increasing temperature; structural viscosity index and a zero-shear viscosity as the temperature is gradually reduced as the temperature rises. Viscous flow activation energy decreases with increasing shear rate. Within the scope of the study, with the increase of the content of BG, a non-Newtonian index of the PET / BG blend melt larger structural viscosity index and the smaller the activation energy of viscous flow. The above results show that in the PET base body ADD BG less influence on the spinnability. (2) X-ray energy dispersive spectroscopy, and a melt flow velocity meter BG test results show that the migration occurred during the preparation of the PET / BG blends. (3) the use of the internal standard method of hydroxylamine hydrochloride method and iodometric method, infrared spectroscopy to study the response characteristics of the BG and formaldehyde, the single factor to consider can be drawn: in the hydroxymethylation stage, the optimum reaction temperature 80 ℃, time 40min , pH 8.5; in the polycondensation stage, a polycondensation temperature 80 ° C Time 2h, pH value of from 4 to 5, and is easy to form a multi-mesh structure of the crosslinking points of a thermosetting resin. (4) SEM, FTIR, XRD studies show that, compared with pure polyester fiber, anti-droplet polyester fiber surface is rough; during the preparation of the anti-droplet polyester fiber, PET / BG blend fibers in BG and formaldehyde the reaction, and the crystal structure of the fibers does not occur with accession and reaction BG changes. (5) through an anti-droplet performance test, TG, DSC and oxygen index (LOI) test shows that anti-droplet polyester fiber compared with the pure polyester fibers, the thermal stability decreases and the decrease in the number of droplet per unit time (1min) ; With BG content increases, the amount of anti-droplet polyester fibers into carbon gradually increase anti-droplet gradually increased, LOI increases gradually.
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