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High-viscosity polyamide 56 resin, high-strength polyamide 56 industrial yarn and preparation method and application thereof

A technology of high-viscosity polyamide and viscous polyamide, which is applied in the field of polyamide materials, can solve the problems of reducing the breaking strength of fibers, increasing the number of broken filament cakes, and unfavorable high fiber drafting, etc., and achieves melt viscosity. Uniform, increased melt shear rate, better quality results

Active Publication Date: 2020-07-17
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyester, polyamide 6, and polyamide 66 industrial yarns are generally oiled by emulsion tankers, and the water content in the emulsion is 80-90%. Polyamide 56 is oiled by emulsion, and the primary silk will quickly absorb the emulsion during the oiling process. The moisture in the fiber will cause water absorption and crystallization, and the crystallinity of the fiber will increase, which is not conducive to the subsequent high-power drafting of the fiber, and the fiber breaking strength will decrease. Subsequent high-power drafting will increase the number of broken monofilaments and the number of filaments in the yarn cake, and cannot be produced normally.

Method used

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  • High-viscosity polyamide 56 resin, high-strength polyamide 56 industrial yarn and preparation method and application thereof
  • High-viscosity polyamide 56 resin, high-strength polyamide 56 industrial yarn and preparation method and application thereof
  • High-viscosity polyamide 56 resin, high-strength polyamide 56 industrial yarn and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] (1) The low-viscosity polyamide 56 resin with a relative viscosity of 2.65 is dried at a high temperature to obtain a tackified polyamide 56 resin; (2) the tackified polyamide 56 resin obtained in step (1) is subjected to resin conditioning Wet treatment to obtain the high-viscosity polyamide 56 resin; the high-temperature drying treatment adopts vacuum protection, and the vacuum degree during the vacuuming is -0.06Mpa; the temperature of the high-temperature drying treatment is 150°C; The time for the high-temperature drying treatment is 20 hours; the equipment for the high-temperature drying treatment is a vacuum drum dryer; the relative viscosity of the tackified polyamide 56 resin is 3.5, and the water content is 55ppm; The moisture content of the high-viscosity polyamide 56 resin is 500ppm; the temperature of the humidity-conditioning treatment of the resin is 100°C, and the humidity-conditioning treatment is carried out by using nitrogen mixed with water vapor, and...

Embodiment 2

[0108] (1) drying the low-viscosity polyamide 56 resin with a relative viscosity of 2.5 to obtain a tackified polyamide 56 resin; (2) performing resin conditioning on the tackified polyamide 56 resin obtained in step (1). Wet treatment to obtain the high-viscosity polyamide 56 resin; the high-temperature drying treatment is to adopt vacuum protection, and the vacuum degree during the vacuuming is -0.08Mpa; the temperature of the high-temperature drying treatment is 160°C; The time for the high-temperature drying treatment is 15 hours; the equipment for the high-temperature drying treatment is a vacuum drum dryer; the relative viscosity of the tackified polyamide 56 resin is 3.45, and the water content is 60ppm; The moisture content of the high-viscosity polyamide 56 resin is 450ppm; the temperature of the resin humidity-conditioning treatment is 105°C, and the humidity-conditioning treatment is carried out by using nitrogen mixed with water vapor, and the nitrogen dew point is ...

Embodiment 3

[0111] (1) The low-viscosity polyamide 56 resin with a relative viscosity of 2.6 is dried at a high temperature to obtain a tackified polyamide 56 resin; (2) the tackified polyamide 56 resin obtained in step (1) is subjected to resin conditioning Wet treatment to obtain the high-viscosity polyamide 56 resin; the high-temperature drying treatment adopts vacuum protection, and the vacuum degree during the vacuuming is -0.07Mpa; the temperature of the high-temperature drying treatment is 180°C; The time for the high-temperature drying treatment is 13 hours; the equipment for the high-temperature drying treatment is a vacuum drum dryer; the relative viscosity of the tackified polyamide 56 resin is 3.6, and the water content is 30ppm; The moisture content of the high-viscosity polyamide 56 resin is 350ppm; the temperature of the resin humidity-conditioning treatment is 110°C, and the humidity-conditioning treatment is carried out by using nitrogen mixed with water vapor, and the nit...

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Abstract

The invention provides a high-viscosity polyamide 56 resin, a high-strength polyamide 56 industrial yarn, and preparation methods and applications of the high-viscosity polyamide 56 resin and the high-strength polyamide 56 industrial yarn. The preparation method of the high-strength polyamide 56 industrial yarn comprises the following steps: heating and melting high-viscosity polyamide 56 resin byadopting a single-screw or double-screw extruder, drawing in a spinning box to obtain a primary yarn, and then carrying out heat preservation, cooling, oiling, pre-interlacing, multi-stage stretching, tension setting, relaxation setting, main interlacing and winding on the primary yarn to obtain the high-strength polyamide 56 industrial yarn. The high-strength polyamide 56 industrial yarn provided by the invention has good mechanical properties and heat and humidity resistance, and can be applied to the fields of sewing threads, tire cords, airbag yarns, release cloth, water cloth, canvas, safety belts, ropes, fishing nets, industrial filter cloth, conveyor belts, parachutes, tents and bags.

Description

technical field [0001] The invention belongs to the technical field of polyamide materials, and relates to a high-viscosity polyamide 56 resin, a high-strength polyamide 56 industrial yarn and a preparation method and application thereof. Background technique [0002] Polyester and nylon industrial yarns have the characteristics of high strength, low elongation, good dimensional stability, fatigue resistance and aging resistance, making them widely used in tire cords, canvas, conveyor belts, airbags, parachutes, ropes, safety belts , industrial filter cloth or tents and other fields. [0003] There are two production processes of industrial yarn: one is the direct spinning method of the melt, and the other is the indirect spinning method of the slice solid phase thickening. Polyamide 66 and polyethylene terephthalate have been partly spun directly from the melt. Because polyamide 6 contains 8-10wt% monomers in the polymer, it needs to go through a process of removing monome...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28D01F6/60D01D5/088D01D5/096D01D5/16D01D5/22D01D10/02D02G3/46D02G3/48
CPCC08G69/26C08G69/28D01F6/60D01D5/22D01D5/16D01D5/088D01D5/096D01D10/02D02G3/46D02G3/48Y02P70/62
Inventor 孙朝续陈万钟刘修才
Owner CATHAY R&D CENT CO LTD
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