Production method of special polyester staple fiber for high-strength medium-elongation nonwoven fabric

Abstract

The invention relates to a method for producing polyester staple fiber specially used for high-strength middle-stretching non-woven fabric, mainly comprises the processing steps as follows: the raw materials: phthalic acid and ethylene glycol are mixed and stirred and sequentially enter a primary esterification reactor and a secondary esterification reactor for esterification reaction; subsequently, the materials sequentially enter a primary polycondensation reactor, a secondary polycondensation reactor and a final polycondensation reactor for polycondensation reaction; the produced polyestermelt is spinned, cooled, coiled, stored, collected as bundles, stretched, tensioned and thermally shaped, curled, loosened and thermally shaped, cut off and finally packaged so as to prepare the polyester staple fiber specially used for high-strength middle-stretching non-woven fabric; the secondary esterification reactor is internally provided with 300-600ppm of Di-n-butyl Phthalate; and the characteristic viscosity of the polyester melt is controlled to be 0.64-0.66, the spinning temperature is controlled to be 295-300 DEG C, the blowing temperature of a blowing device is 25-28 DEG C and the temperature for loosening and thermal shaping is 130-150 DEG C. The method can ensure the fracture strength of the fiber and has proper elongation at break and dry-hot shrinkage.

Description

(1) Technical field [0001] The invention relates to a fiber production method, in particular to a production method of polyester staple fibers specially used for high-strength and medium-stretch non-woven fabrics. It is mainly used in the production of non-woven fabrics such as linoleum base fabrics. It belongs to the technical field of chemical fiber production. (2) Background technology [0002] With the continuous expansion of the application field of non-woven fabrics and the continuous improvement of production technology, the requirements for the quality of raw materials are becoming more and more diverse, and the special requirements for some special products are almost harsh. At present, the breaking strength of conventional medium-length polyester staple fibers in the market is in the range of 4.5 to 5.0, the elongation at break is about 30%, and the dry heat shrinkage rate at 180°C is about 7%. For non-woven fabrics used as linoleum base fabrics, etc., the fiber ...

AI Technical Summary

Problems solved by technology

In the production process of polyester fiber, the breaking strength and the breaking elongation are two mutually opposite indexes. The means of increasing the breaking strength often reduce the breaking elongation at the same time; and to reduce the dry heat shrinkage, the breaking strength also will suffer loss

Therefore, it is extremely difficult to produce polyester staple fibers with high breaking strength, medium elongation at break, and low dry heat shrinkage.

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