Flame retardant fiber production process

There are Flame retardant fabric manufacturing coating, blending , and graft copolymerization modification method and core-sheath composite spinning method . Coating method is a fiber made ​​of a flame retardant used in the production process or its physical adsorption or chemical binding , the flame attached to the flame-retardant fiber to achieve the purpose of the method . However, moisture can lead to physical adsorption , toxicity and other issues, it will cause fabrics chemisorption strength decreased , feel hard and other defects. And this fire-retardant treatment method limited scope depends on the skills and finishing plant , the treatment effect instability, poor durability . This method is generally used for natural fiber fabrics and synthetic blended fabric with flame processing, can also be used for pure polyester , polyacrylonitrile fabric processing , but the application is not common. Blending the spinning slice that is added during the manufacturing process or the flame retardant was added to a melt spinning method to obtain flame retardant fiber . To produce a flame retardant polypropylene fiber , the addition of flame retardants , there are two methods : ① Full Granulation : the polypropylene , flame retardants , stabilizers were blended , and extrusion granulation . Pellets with this spinning , flame retardant properties can be obtained with polypropylene fibers. ② masterbatch method: flame retardants, carrier , stabilizer were blended granulation, which is masterbatch pellets . Spinning , the polypropylene masterbatch certain proportion slices mixed, and spun to obtain a flame retardant polypropylene fiber . This method uses the more common , reducing the spinning temperature , to improve the spinnability of the polypropylene , the yarn strength, elongation qualities such little effect . Copolymerization polymer that is added during polymerization of the monomer in a flame retardant obtained by copolymerizing a molecular chain containing fire retardant chemicals unit slice spinning method . Modified polymers using this method , durable flame retardancy . This method is mainly used for addition polymerization type ( polyacrylonitrile ) and polycondensation type ( polyester, polyamide ) . Graft modification method is to use radiant heat , high-energy electron beam or chemical initiator of the fiber and flame retardant monomer graft copolymerization, to obtain effective and lasting flame retardant modified method . Fire retardant and flame retardant modified fiber grafting monomer graft copolymerization retardant elements and relevant parts . The flame-retardant sheath-core composite spinning method for modifying the application is not common , primarily because of the need complicated spinning apparatus . In recent years, composite flame retardant polyester fiber spinning method , the use of skin - core structure , that is, or add a flame retardant copolymer polyester core common polyester composite spun from the cortex . This is to prevent premature decomposition of halogenated flame retardants affect hydrogen halide leave the flame retardant effect, and also prevents certain shortcomings of phosphorus flame retardants are not high temperature , but also to maintain the original appearance of the fibers , whiteness and dyeability .