Method for preparing flame-proof polyester fiber

Abstract

The invention relates to a flame retardant polyester fiber preparation method. Pure terephthalic acid, ethylene glycol and phenyl-(ethylene glycol propionate) phosphinic acid are used for the esterification under the positive pressure and for the polycondensation, the belt casting and the granulation under the negative pressure to obtain fire retardant polyester slices. The phenyl-(ethylene glycol propionate) phosphinic acid is phosphor series fire retardant. The content of phosphor in the slices is controlled to be 0.5 to 1 percent. The fire retardant polyester slices are put in a vacuum drum dryer. The dried slices are put on a spinning machine for the spinning to obtain the fire retardant polyester fiber. The fire retardant property is stable. No free flame retardant agent monomer exists. The utilization rate of the fire retardant is improved. The corrosion, toxic gas and the smoke releasing amount of the polyester fiber and the textile are lowered. The production technological process is simplified at the same time. The used raw material categories are reduced. The production cost of the fire retardant polyester fiber is reduced. The oxygen index is 32 to 34 percent.

Description

technical field

[0001] The invention relates to a preparation method of flame-retardant polyester fiber. Background technique

[0002] As the largest synthetic fiber, polyester fiber has an oxygen index (OI) of only 21-22%, and is flammable. At present, the flame retardants used in the production of flame-retardant polyester and fibers in my country are mostly brominated flame retardants, and brominated flame-retardant polyesters and fibers produce toxic substances that endanger human health when they are burned and degraded at high temperatures. Phosphorus-based flame retardants not only have good flame retardancy, but also reduce the release of corrosion, toxic gases and smoke through solid-phase char formation and mass retention mechanisms and partial gas-phase flame retardant mechanisms in polyester, so they can overcome Some disadvantages of halogenated flame retardants. Phosphorous flame retardants are environmentally friendly. The flame retardant modification metho...