Preparation Process Optimization Of Far-Infrared Polyeaster Masterbatches And Fibers

PET is the abbreviation for polyethylene terephthalate. It is cheap, sturdy, durable, not easy to deform. It also has good elasticity, corrosion resistance and insulation. China is the largest producer and user of polyester in the word, but Chinese products are facing a problem of single type and low technical content. High performance, differentiation and functional fibers are still the direction of future development.Far infrared polyester fiber is a fiber which is prepared by adding an absorbent. The agent can absorb heat from the outside and release far infrared radiation. Inorganic powder is the most widely used far infrared agent at present. The far infrared radiation it releases can rise sensible temperature of human and penetrate deep into the skin to promote blood circulation. Far infrared polyester fiber is a multifunctional fiber which can keep warm and take health care. With the uprising general public requirement on health, far infrared polyester fiber has a promising future.Usually various inorganic substances are mixed to broaden far infrared emission spectrum so as to get good far infrared radiation performance. This article studies the influence of calcination temperature on mixed metal oxide (MMO). Mg-Al layered double hydroxides (LDHs) are calcined at700℃to prepare MMO which contains less impurities and has a low moisture absorption. Mg-Al MMO, SiO2and ZrO2with certain proportion are mixed to prepare far infrared agent. The influence of different processing technology on the particle size and distribution of far infrared agent is studied. Wet grinding process is used for60min to prepare the agent which is uniformly dispersed and has a particle size of500nm. Dry grinding and modifying one step process is used for5hour and then airflow pulverization is also used to prepare the agent which is widely dispersed and has an average particle size of350nm. The far infrared agent is modified by2-4wt%titanate coupling agent to control the memory effect of MMO and increase the compatibility of the agent and PET.Master batch method is used to prepare polyester chips with10wt%far infrared agent. Preparation process of far infrared agent is determined according to the research on the water content of far infrared agent, dispersity of far infrared agent in the polyester and filter pressure performance. The molecular weight of far infrared polyester chips is measured. The result suggests that MgO is the main reason what lead polyester to degrade. And the water content and micromolecule is the second one. Melt spinning method is used to prepare different specifications of far infrared polyester fiber. Research on the mechanical properties of the fibers shows that the fiber strength decrease when addition of the agent rise. The strength of the fiber which wet process far infrared agent was added to is the minimum and decrease about50%. The strength of the fiber which dry process far infrared agent was added to is better and decrease about18%.Different far infrared polyester fibers are twisted and waved to prepare far infrared polyester fabric. Elevated temperature method is used to test the far infrared performance of the fabric. The temperature of far infrared fabric with1.5wt%agent rises2℃than the pure polyester fabric during the same time irradiation. The product has obvious far infrared radiation performance and is better than the similar one in market.