Hot drawing method for aromatic polysulfonamide nascent fibre

Abstract

The invention relates to a hot drawing method for aromatic polysulfonamide nascent fibres, which is a method different from the drawing technology adopted for preparing the aromatic polysulfonamide nascent fibres in the prior art. The hot drawing method for aromatic polysulfonamide nascent fibres, which is disclosed by the invention, comprises the following steps: the nascent fibres obtained through extruding, solidifying and shaping aromatic polysulfonamide spinning solution is drawn in hot air, wherein the temperature of the hot air is 80-180DEG C, and the drawing multiple is 2-16; and the aromatic polysulfonamide nascent fibre comprises 10-50wt% of aromatic polysulfonamide, 10-60wt% of solvent and the balance of water. According to the hot drawing method for aromatic polysulfonamide nascent fibres, which is disclosed by the invention, a molecular orientation degree is improved, thereby being favorable to crystallization in the follow-up high-temperature heat setting process and improvement of fibre strength.

Description

technical field

[0001] The invention belongs to the field of preparation of arylsulfonamide fiber, and relates to a thermal stretching method of polyarylsulfonamide nascent fiber. Background technique

[0002] Polyaryl sulfone amide fiber has excellent heat resistance, good electrical insulation, good dimensional stability and chemical corrosion resistance, and can still maintain good physical properties when exposed to high temperatures. Fireproof clothing and F.H grade electrical insulating paper and some other industrial applications. However, due to the poor mechanical properties of the spun polyarylsulfonamide fiber, its wide application is affected.

[0003] The stretching of polyarylsulfonamide nascent fibers is one of the processes that have the greatest impact on the structure and performance of the fibers. The stretching process of the primary fiber determines the mechanical properties of the finished fiber. This is because the primary fiber orients the polyaryl...

Examples

Embodiment 1

[0035] Mix polyaryl sulfone amide having a weight average molecular weight of 1,000,000 and consisting of units of structural formula (1) with solvent 1-butyl-3-methylimidazolium chloride to obtain a spinning solution with a concentration of 8 wt%.

[0036] The spinning solution is extruded through the spinneret, the extrusion temperature is 105°C, the extrusion speed is 20m / min, the aspect ratio of the spinneret hole is 1.8, passes through a section of 20mm air section, and then enters a solvent and residual solution composed of 60wt%. Measure water and coagulate in a coagulation bath at a temperature of 40° C. to obtain polyarylsulfone amide primary fibers composed of 10 wt % polyarylsulfone amide, 60 wt % solvent 1-butyl-3-yl imidazolium chloride salt and the balance of water.

[0037] The as-spun fiber was stretched 15 times under hot air at a temperature of 80° C., and the strength of the finally obtained polyarylsulfonamide fiber was 3.51 cN / dtex.

Embodiment 2

[0039] Mix the polyarylsulfone amide having a weight average molecular weight of 10000 and consisting of units of the structural formula (3) with the solvent 1-butyl-3-methylimidazolium bromide to obtain a spinning solution with a concentration of 40 wt%.

[0040] The spinning solubility is extruded through the spinneret, the extrusion temperature is 70°C, the extrusion speed is 15m / min, the aspect ratio of the spinneret hole is 1.5, passes through an 80mm air section, and then enters the composition of 10wt% solvent and The remaining amount of water is coagulated and formed in a coagulation bath at a temperature of -10° C. to obtain polyarylsulfonamide primary fibers composed of 50 wt % polyarylsulfone amide, 10 wt % solvent and the remaining amount of water.

[0041] The as-spun fiber was stretched 8 times under hot air at a temperature of 180° C., and the strength of the finally obtained polyarylsulfone amide fiber was 3.55 cN / dtex.

Embodiment 3

[0043] The weight average molecular weight is 50000, the polyaryl sulfone amide that is made up of two kinds of units of structural formula (1) and structural formula (2) (mole ratio is 1:9) and solvent 1-allyl-3-methylimidazolium bromide Mix to obtain a spinning solution with a concentration of 10 wt%.

[0044] The spinning solution is extruded through the spinneret, the extrusion temperature is 90°C, the extrusion speed is 10m / min, the aspect ratio of the spinneret hole is 1.4, passes through a section of 30mm air section, and then enters the composition of 20wt% solvent and residual Measure water, coagulate and form in a coagulation bath at a temperature of 0° C., and obtain polyarylsulfonamide primary fibers composed of 15 wt % polyarylsulfone amide, 20 wt % solvent and the balance of water.

[0045] The as-spun fiber was stretched 10 times under hot air at a temperature of 90°C, and the strength of the finally obtained polyarylsulfonamide fiber was 3.63cN / dtex.

technical field

[0001] The invention belongs to the field of preparation of arylsulfonamide fiber, and relates to a thermal stretching method of polyarylsulfonamide nascent fiber. Background technique

[0002] Polyaryl sulfone amide fiber has excellent heat resistance, good electrical insulation, good dimensional stability and chemical corrosion resistance, and can still maintain good physical properties when exposed to high temperatures. Fireproof clothing and F.H grade electrical insulating paper and some other industrial applications. However, due to the poor mechanical properties of the spun polyarylsulfonamide fiber, its wide application is affected.

[0003] The stretching of polyarylsulfonamide nascent fibers is one of the processes that have the greatest impact on the structure and performance of the fibers. The stretching process of the primary fiber determines the mechanical properties of the finished fiber. This is because the primary fiber orients the polyaryl...

Examples

Embodiment 1

[0035] Mix polyaryl sulfone amide having a weight average molecular weight of 1,000,000 and consisting of units of structural formula (1) with solvent 1-butyl-3-methylimidazolium chloride to obtain a spinning solution with a concentration of 8 wt%.

[0036] The spinning solution is extruded through the spinneret, the extrusion temperature is 105°C, the extrusion speed is 20m / min, the aspect ratio of the spinneret hole is 1.8, passes through a section of 20mm air section, and then enters a solvent and residual solution composed of 60wt%. Measure water and coagulate in a coagulation bath at a temperature of 40° C. to obtain polyarylsulfone amide primary fibers composed of 10 wt % polyarylsulfone amide, 60 wt % solvent 1-butyl-3-yl imidazolium chloride salt and the balance of water.

[0037] The as-spun fiber was stretched 15 times under hot air at a temperature of 80° C., and the strength of the finally obtained polyarylsulfonamide fiber was 3.51 cN / dtex.

Embodiment 2

[0039] Mix the polyarylsulfone amide having a weight average molecular weight of 10000 and consisting of units of the structural formula (3) with the solvent 1-butyl-3-methylimidazolium bromide to obtain a spinning solution with a concentration of 40 wt%.

[0040] The spinning solubility is extruded through the spinneret, the extrusion temperature is 70°C, the extrusion speed is 15m / min, the aspect ratio of the spinneret hole is 1.5, passes through an 80mm air section, and then enters the composition of 10wt% solvent and The remaining amount of water is coagulated and formed in a coagulation bath at a temperature of -10° C. to obtain polyarylsulfonamide primary fibers composed of 50 wt % polyarylsulfone amide, 10 wt % solvent and the remaining amount of water.

[0041] The as-spun fiber was stretched 8 times under hot air at a temperature of 180° C., and the strength of the finally obtained polyarylsulfone amide fiber was 3.55 cN / dtex.

Embodiment 3

[0043] The weight average molecular weight is 50000, the polyaryl sulfone amide that is made up of two kinds of units of structural formula (1) and structural formula (2) (mole ratio is 1:9) and solvent 1-allyl-3-methylimidazolium bromide Mix to obtain a spinning solution with a concentration of 10 wt%.

[0044] The spinning solution is extruded through the spinneret, the extrusion temperature is 90°C, the extrusion speed is 10m / min, the aspect ratio of the spinneret hole is 1.4, passes through a section of 30mm air section, and then enters the composition of 20wt% solvent and residual Measure water, coagulate and form in a coagulation bath at a temperature of 0° C., and obtain polyarylsulfonamide primary fibers composed of 15 wt % polyarylsulfone amide, 20 wt % solvent and the balance of water.

[0045] The as-spun fiber was stretched 10 times under hot air at a temperature of 90°C, and the strength of the finally obtained polyarylsulfonamide fiber was 3.63cN / dtex.

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