Technique for producing ultra high-strength terylene industry filament yarn

Abstract

The present invention discloses a production process for an ultra high tenacity polyester industrial filament. The production process adopts a one-step method of spinning and stretching, and the method comprises the solid state tackifying, the melt spinning, the high temperature stretching, the heat setting, and the winding forming. The present invention adopts the innovative five-pair hot roll stretching heat setting process, compared with the traditional four-pair hot roll stretching heat setting, the the present invention adopts two-stage heat stretching, the processing method of the two-stage heat setting effectively reduces the stretching speed of fiber, and prolongs the heat setting time of the fiber, so that the fiber has an even stable orientation structure while the physical performance of products is ensured, the spinning condition is optimized. The ultra high tenacity polyester industrial filament prepared by utilizing the method of the present invention has the advantages that the intensity is high, the stretching and the dry heat shrinkage are reasonable, the heat resistant performance is good, and the impact resistant performance and the fatigue resistant performance are good.

Description

technical field

[0001] The invention discloses a production process of ultra-high-strength polyester industrial filament, which belongs to the technical field of textile technology. Background technique

[0002] Since the advent of polyester in the 1950s, great progress has been made in the development of industrial applications. Polyester ultra-high-strength industrial filaments are widely used in the weaving of lifting belts, wire ropes, and cables due to their extremely high strength.

[0003] At present, the domestic production is generally ordinary high-strength polyester industrial filament, and its quality is as follows: the breaking strength is 7.8-8.0cN / dtex, the dry heat shrinkage rate is 8-13%, and the 5% constant elongation load is <4cN / dtex. Ordinary high-strength wire can only be used to make general industrial products, and compared with high-performance products, it is necessary to use more raw wires to manufacture products that can lift the same load, wh...

Examples

Embodiment 1

[0022] 1. Ordinary polyethylene terephthalate (PET) slices undergo solid-state polymerization to become industrial-grade high-viscosity slices that can produce industrial yarns: low-viscosity PET slices are quantitatively fed into the crystallizer through a rotary valve, and hot air is circulated at 180°C Crystallization under action to a crystallinity of 30%, and then fed into a roof-mounted reactor through a rotary valve with an air lock device, and solid-phase polycondensation was carried out in a nitrogen environment at 230 ° C. By adjusting the residence time and nitrogen purity, the relative viscosity was adjusted to 0.67 The low-viscosity slices are viscosified to the high-viscosity slices with a relative viscosity of 1.05. When the high-viscosity chips are cooled to 120°C, the nitrogen delivery system is used to transport the high-viscosity chips to the silo of the screw extruder.

[0023] 2. Melted and extruded by the screw extruder, sprayed out from the spinneret hol...

Embodiment 2

[0025] Embodiment 2, the preparation method and equipment are the same as in Example 1, except that in step 3, the first step heat setting temperature is 245°C, and the relaxation ratio is 4.4%, and the second step heat setting temperature is 240°C, and the relaxation ratio is 7.6%; the total relaxation than about 12%.

technical field

[0001] The invention discloses a production process of ultra-high-strength polyester industrial filament, which belongs to the technical field of textile technology. Background technique

[0002] Since the advent of polyester in the 1950s, great progress has been made in the development of industrial applications. Polyester ultra-high-strength industrial filaments are widely used in the weaving of lifting belts, wire ropes, and cables due to their extremely high strength.

[0003] At present, the domestic production is generally ordinary high-strength polyester industrial filament, and its quality is as follows: the breaking strength is 7.8-8.0cN / dtex, the dry heat shrinkage rate is 8-13%, and the 5% constant elongation load is <4cN / dtex. Ordinary high-strength wire can only be used to make general industrial products, and compared with high-performance products, it is necessary to use more raw wires to manufacture products that can lift the same load, wh...

Examples

Embodiment 1

[0022] 1. Ordinary polyethylene terephthalate (PET) slices undergo solid-state polymerization to become industrial-grade high-viscosity slices that can produce industrial yarns: low-viscosity PET slices are quantitatively fed into the crystallizer through a rotary valve, and hot air is circulated at 180°C Crystallization under action to a crystallinity of 30%, and then fed into a roof-mounted reactor through a rotary valve with an air lock device, and solid-phase polycondensation was carried out in a nitrogen environment at 230 ° C. By adjusting the residence time and nitrogen purity, the relative viscosity was adjusted to 0.67 The low-viscosity slices are viscosified to the high-viscosity slices with a relative viscosity of 1.05. When the high-viscosity chips are cooled to 120°C, the nitrogen delivery system is used to transport the high-viscosity chips to the silo of the screw extruder.

[0023] 2. Melted and extruded by the screw extruder, sprayed out from the spinneret hol...

Embodiment 2

[0025] Embodiment 2, the preparation method and equipment are the same as in Example 1, except that in step 3, the first step heat setting temperature is 245°C, and the relaxation ratio is 4.4%, and the second step heat setting temperature is 240°C, and the relaxation ratio is 7.6%; the total relaxation than about 12%.