CN108677267A - A kind of preparation method of high-strength daiamid-6 fiber - Google Patents
A kind of preparation method of high-strength daiamid-6 fiber Download PDFInfo
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- CN108677267A CN108677267A CN201810394574.XA CN201810394574A CN108677267A CN 108677267 A CN108677267 A CN 108677267A CN 201810394574 A CN201810394574 A CN 201810394574A CN 108677267 A CN108677267 A CN 108677267A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/90—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyamides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Polyamides (AREA)
Abstract
The present invention relates to a kind of preparation methods of high-strength daiamid-6 fiber, including：Prepared by chain extender, prepared by modified hectorite, and prepared by the modification hectorite of acid or acid anhydrides grafting, prepared by high-strength PA6 compound resins, prepared by high-strength PA6 composite fibres.Hectorite is modified by the present invention with KH570, and after being reacted with unsaturated dibasic acid or dibasic acid anhydride, the compatibility of itself and polymeric matrix can be enhanced, and introducing amino on hectorite makes it enhance with PA6 strand active forces, easily it is orientated with PA6 molecular chain orientations, compound resin crystal property is improved, its mechanical property is enhanced；The PA6 fibers of preparation can effective reinforcing fiber mechanical property, can effectively apply in the interior trims such as household textiles, automobile product, big aircraft, high ferro, military battle-dress uniform decorations etc..
Description
Technical field
The invention belongs to high-strength Fypro preparation field, more particularly to a kind of preparation side of high-strength daiamid-6 fiber
Method.
Background technology
Polyamide is commonly called as nylon, due to excellent performance and melting moldability, with nylon 6, nylon66 fiber, Buddhist nun
Dragons 1212 etc. are the crystal type polyamide extensive use in garment fabric and industrial materials of representative, and may be used as leading to
It is widely used in the fields such as automobile, electronic apparatus with engineering plastics.But that there are heat resistances is insufficient for above-mentioned general polyamide,
The defects of water imbibition is strong, modulus is not high enough, especially automobile and electronic field, it is desirable that polyamide has high-fire resistance, high intensity
Deng therefore, there is an urgent need to a kind of polyamide of high intensity and fibers.
Currently, the method for preparing high intensity Fypro includes mainly：Chain extension, nanometer enhancing, solid phase polycondensation and after lead
It stretches.
Invention content
Technical problem to be solved by the invention is to provide a kind of preparation method of high-strength daiamid-6 fiber, this method is
On the basis of polymerizeing based on conventional polymer, with diamine react preparing chain extender using dibasic acid anhydride, and by lithium soap
Stone is modified, and with the binary acid containing unsaturated bond or dibasic acid anhydride react and improved the compatible of hectorite and matrix
Property；It cooperates with enhancing to prepare PA6 compound resins with physical modification using chemical modification, compound tree is realized using in-situ polymerization one-step method
The preparation of fat prepares high intensity PA6 fibers by melt spinning and first break draft, setting process；Enhancing effect is notable, operating process
It is easy, it is easy to accomplish large-scale production.
A kind of preparation method of high-strength daiamid-6 fiber of the present invention, including：
(1) dibasic acid anhydride and diamine containing phenyl ring are dissolved in solvent respectively, the obtained diamine solution containing phenyl ring
It instills in obtained dibasic acid anhydride solution, obtaining chain extender after filtering, acetone washing (can be used for PA6 chain extensions and the list of enhancing
Body), the molar ratio of wherein dibasic acid anhydride and the diamine containing phenyl ring is 1-4:1, a concentration of 5- of diamine solution containing phenyl ring
20g/ml, dibasic acid anhydride solution concentration are 5-20g/ml；
(2) in a solvent by hectorite dispersion, silane coupling agent reaction is added, obtains modified hectorite, is dispersed in water
In, unsaturated dibasic acid or unsaturated dicarboxylic acid anhydride, initiator and catalyst reaction is added, cleaning obtains acid or acid anhydrides grafting
Modification hectorite, wherein the mass ratio of silane coupling agent and hectorite be 0.5-2:1, modified hectorite, unsaturated binary
The mass ratio of acid or unsaturated dicarboxylic acid anhydride, initiator and catalyst is 1：1-2：0.001%-0.3%：0.001%-0.3%,
The mass ratio of modified hectorite and water is 1-5:100, the ratio of hectorite and solvent is 1g：30-100mL；
(3) chain extender in caprolactam and step (1) is mixed, acid or the modification lithium of acid anhydrides grafting in step (2) is added
The aqueous dispersions of saponite, open loop, polycondensation obtain high-strength PA6 compound resins, after spinning drawing, obtain the compound fibres of high-strength PA6
Dimension, wherein acid or the modification hectorite of acid anhydrides grafting account for the 0.5%-3% of gross mass, chain extender accounts for the 1%-10% of gross mass,
Gross mass is the quality sum of the modification hectorite of acid or acid anhydrides grafting, chain extender and caprolactam.
Dibasic acid anhydride is succinic anhydride or phthalic anhydride in the step (1)；Solvent is acetone.
The diamine containing phenyl ring is p-phenylenediamine, 4,4 '-diaminodiphenyl-methanes or 1,5- naphthalenes two in the step (1)
Amine.
Solvent is ethanol water in the step (2)；Hectorite grain size is 10-50nm.
Silane coupling agent is KH570 in the step (2)；Initiator is ammonium persulfate；Catalyst is tetramethylethylenediamine.
Unsaturated dibasic acid is itaconic acid or maleic acid in the step (2)；Unsaturated dicarboxylic acid anhydride is itaconic acid
Acid anhydride or maleic anhydride.
Silane coupling agent reaction is added in the step (2) is：It is warming up to 50-70 DEG C of reaction 2-4h.
Unsaturated dibasic acid is added in the step (2) or unsaturated dicarboxylic acid anhydride, initiator and catalyst reaction are：
React at room temperature 3-5h.
Ring-opening reaction temperature is 240~250 DEG C in the step (3), and the ring-opening reaction time is 2~6h；Polycondensation reaction temperature
Degree is 250~270 DEG C, and polycondensation reaction time is 3~8h.
Spinning temperature is 240~260 DEG C in the step (3), spinning speed 1500-3000m/min.
Draw conditions are in the step (3)：Drawing temperature is 50-70 DEG C, and heat setting temperature is 100-120 DEG C, drawing-off
Multiple is 2-4 times.
The intensity of high-strength PA6 composite fibres is 6cN/dtex~12cN/dtex in the step (3).
The present invention prepares novel chain extender by reacting dibasic acid anhydride with diamine, while by hectorite KH570
It is modified reacted with the binary acid containing unsaturated double-bond or acid anhydrides after, be added polymerization system can greatly enhance hectorite with
The compatibility of PA6 matrixes.
The present invention prepares the PA6 compound resins with high intensity by using chemical modification and physical modification synergistic effect,
And prepare the PA6 fibers with high intensity by the techniques such as melt spinning and drawing-off, sizing.
Therefore, the present invention realizes using the method for copolymerization, nanometer in situ polymerization and introduces rigid chain segment in PA6 main chains, and is former
Position introduces the small size inorganic nano material for having strong effect power with matrix, the synchronous mesh for realizing enhancing crystallization and enhancing mechanics
's.The industrialization of PA6 high-intensity fibers can effectively fill up domestic PA6 high-intensity fiber technology of preparing blank through the invention.
Advantageous effect
(1) present invention, which reacts dibasic acid anhydride with the diamine containing phenyl ring, prepares a kind of expansion can be used for PA6 chain extending reactions
Chain agent.The chain extender preparation method is simple and easily introduces rigid chain segment on PA6 main chains containing benzene ring structure, enhances its performance；
(2) hectorite that uses of the present invention is 10-50nm, and to be dispersed in water.Hectorite is modified with KH570, and
After being reacted with unsaturated dibasic acid or dibasic acid anhydride, the compatibility of itself and polymeric matrix can be enhanced, and introduced on hectorite
Amino makes it enhance with PA6 strand active forces, is easily orientated with PA6 molecular chain orientations, improves compound resin crystal property, increases
Its strong mechanical property；
(3) the PA6 fibers that prepare of the present invention can effective reinforcing fiber mechanical property, can effectively apply in household textile
The interior trims such as product, automobile product, big aircraft, high ferro, military battle-dress uniform decorations etc.；
(4) present invention is easy to operate, efficient, and at low cost, effectiveness is lasting, has a extensive future.
Description of the drawings
Fig. 1 is the chain extender structures formula that PA6 chain extensions are used in embodiment 1.
Fig. 2 be the present invention used in hectorite (a) 100nm transmission electron microscope picture and (b) 50nm transmission electron microscope picture.
Fig. 3 is the TG data of hectorite, hectorite-KH570 and hectorite-KH570- maleic anhydrides in embodiment 1
Figure.
Fig. 4 is the schematic diagram of maleic anhydride graft modification hectorite in embodiment 1.
Fig. 5 is maleic anhydride graft modification hectorite and PA6 interaction schematic diagrames prepared by embodiment 1.
Specific implementation mode
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1
(1) it is 2 by molar ratio:1 succinic anhydride is dissolved in acetone respectively with p-phenylenediamine, obtain succinic anhydride solution,
P-phenylenediamine solution, succinic anhydride solution concentration are 5g/ml, and p-phenylenediamine solution concentration is 5g/ml, and p-phenylenediamine solution is dripped
Enter in succinic anhydride solution, acetone washes 3 times and obtains chain extender after filtering.
(2) (1g hectorites are scattered in the water of 50g ethyl alcohol after being dispersed in after hectorite ultrasound in the aqueous solution of ethyl alcohol
In solution), it is 0.5 in mass ratio by KH570 and hectorite:It is warming up to 60 DEG C of reaction 3h after 1 mixing, obtains KH570 modifications
Hectorite.The 1g KH570 hectorites being modified are dispersed in 100ml water, maleic anhydride, ammonium persulfate and tetramethyl is added
Base reacting ethylenediamine 4h, is cleaned with water and ethyl alcohol, and the mass ratio of hectorite and maleic anhydride that KH570 is modified is 1:
The mass ratio of 1, KH570 hectorite, ammonium persulfate and the tetramethylethylenediamine being modified is 1：0.015%：0.015%, it obtains suitable
The modification hectorite of anhydride maleique grafting.
(3) chain extender in caprolactam and step (1) is added in polymerization reaction kettle, by maleic two in step (2)
The modification hectorite of acid anhydrides grafting is added to after (1g be modified hectorite be scattered in 100ml water) ultrasonic disperse poly- together in water
It closes in reaction kettle, the mass ratio of modification hectorite, chain extender and caprolactam that maleic anhydride is grafted is 1:5:94,240
DEG C reaction 4h after, 260 DEG C reaction 6h, obtain high-strength PA6 compound resins, melt spinning and the spinning through 2000m/min at 240 DEG C
Silk speed carries out spinning winding, the drawing-off at 60 DEG C, and thermal finalization at 110 DEG C obtains high-strength PA6 fibers, fiber is strong through 3 times of drawing-offs
Degree is 8cN/dtex.
Fig. 2 shows：The size of hectorite is about 20-30nm, and small size, high dispersive are conducive to improve the mechanical property of composite fibre
Energy.
Fig. 3 shows：KH570 grafting rates are about 15%, and it is about 7.5% that maleic anhydride, which continues modified grafting rate, always
Grafting rate is about 22.5%.
Embodiment 2
(1) it is 2 by molar ratio:1 phthalic anhydride is dissolved in acetone respectively with p-phenylenediamine, obtains phthalic acid
Anhydride solution, p-phenylenediamine solution, phthalic anhydride solution concentration are 10g/ml, and p-phenylenediamine solution concentration is 10g/ml, will
P-phenylenediamine solution instills in phthalic acid anhydride solution, and acetone washes 3 times and obtains chain extender after filtering.
(2) (1g hectorites are scattered in 80ml ethyl alcohol after being dispersed in after hectorite ultrasound in the aqueous solution of ethyl alcohol
In aqueous solution), it is 1.5 in mass ratio by KH570 and hectorite:It is warming up to 60 DEG C of reaction 3h after 1 mixing, obtains KH570 modifications
Hectorite.The 1g KH570 hectorites being modified are scattered in 80ml water, maleic acid, ammonium persulfate and tetramethyl is added
Reacting ethylenediamine 4h, is cleaned with water and ethyl alcohol, and the mass ratio of hectorite and maleic acid that KH570 is modified is 1:2,
The mass ratio of hectorite, ammonium persulfate and tetramethylethylenediamine that KH570 is modified is 1：0.01%：0.01%, obtain maleic
The modification hectorite of diacid grafting.
(3) chain extender in caprolactam and step (1) is added in polymerization reaction kettle, by maleic two in step (2)
The modification hectorite of acid grafting is added to polymerization after (1g be modified hectorite be scattered in 50ml water) ultrasonic disperse together in water
In reaction kettle, the mass ratio of modification hectorite, chain extender and caprolactam that maleic acid is grafted is 1.5:7.5:91,250
DEG C reaction 4h after, 270 DEG C reaction 8h, obtain high-strength PA6 compound resins, melt spinning and the spinning through 3000m/min at 255 DEG C
Silk speed carries out spinning winding, the drawing-off at 70 DEG C, and thermal finalization at 110 DEG C obtains high-strength PA6 fibers, fiber is strong through 3 times of drawing-offs
Degree is 7cN/dtex.
Embodiment 3
(1) it is 2 by molar ratio:1 phthalic anhydride is dissolved in acetone respectively with p-phenylenediamine, obtains phthalic acid
Anhydride solution, p-phenylenediamine solution, phthalic anhydride solution concentration are 15g/ml, and p-phenylenediamine solution concentration is 15g/ml, will
P-phenylenediamine solution instills in phthalic acid anhydride solution, and acetone washes 3 times and obtains chain extender after filtering.
(2) (1g hectorites are scattered in 50ml ethyl alcohol after being dispersed in after hectorite ultrasound in the aqueous solution of ethyl alcohol
In aqueous solution), it is 1 in mass ratio by KH570 and hectorite:It is warming up to 60 DEG C of reaction 3h after 1 mixing, obtains KH570 modifications
Hectorite.The 1g KH570 hectorites being modified are scattered in 50ml water, itaconic acid, ammonium persulfate and tetramethylethylenediamine is added
4h is reacted, is cleaned with water and ethyl alcohol, the mass ratio of hectorite and itaconic acid that KH570 is modified is 1:2, KH570 modifications
The mass ratio of hectorite, ammonium persulfate and tetramethylethylenediamine is 1：0.02%：0.02%, obtain the modification lithium of Itaconic Acid Grafted
Saponite.
(3) chain extender in caprolactam and step (1) is added in polymerization reaction kettle, itaconic acid in step (2) is connect
The modification hectorite of branch is added to polymerisation after (1g be modified hectorite be scattered in 80ml water) ultrasonic disperse together in water
In kettle, the mass ratio of the modification hectorite of Itaconic Acid Grafted, chain extender and caprolactam is 2:7:After 91,240 DEG C of reaction 4h,
270 DEG C of reaction 5.5h, obtain high-strength PA6 compound resins, at 250 DEG C melt spinning and spinning speed through 1500m/min into
Row spinning winding, the drawing-off at 65 DEG C, thermal finalization at 110 DEG C obtain high-strength PA6 fibers, fibre strength is through 4 times of drawing-offs
10cN/dtex。
Embodiment 4
(1) it is 2 by molar ratio:1 succinic anhydride is dissolved in acetone respectively with p-phenylenediamine, obtain succinic anhydride solution,
P-phenylenediamine solution, succinic anhydride solution concentration are 20g/ml, and p-phenylenediamine solution concentration is 20g/ml, by p-phenylenediamine solution
It instills in succinic anhydride solution, acetone washes 3 times and obtains chain extender after filtering
(2) (1g hectorites are scattered in 75ml ethyl alcohol after being dispersed in after hectorite ultrasound in the aqueous solution of ethyl alcohol
In aqueous solution), it is 1.5 in mass ratio by KH570 and hectorite:It is warming up to 60 DEG C of reaction 3h after 1 mixing, obtains KH570 modifications
Hectorite.The 1g KH570 hectorites being modified are scattered in 100ml water, itaconic anhydride, ammonium persulfate and tetramethyl is added
Reacting ethylenediamine 4h, is cleaned with water and ethyl alcohol, and the mass ratio of hectorite and itaconic anhydride that KH570 is modified is 1:1.5
The mass ratio of hectorite, ammonium persulfate and tetramethylethylenediamine that KH570 is modified is 1：0.02%：0.01%, obtain itaconic acid
The modification hectorite of acid anhydride grafting.
(3) chain extender in caprolactam and step (1) is added in polymerization reaction kettle, by itaconic anhydride in step (2)
It is anti-that the modification hectorite of grafting is added to polymerization after (1g be modified hectorite be scattered in 50ml water) ultrasonic disperse together in water
It answers in kettle, the mass ratio of modification hectorite, chain extender and caprolactam that itaconic anhydride is grafted is 3:5:92,250 DEG C of reaction 5h
Afterwards, 260 DEG C of reaction 8h, obtain high-strength PA6 compound resins, at 255 DEG C melt spinning and spinning speed through 2000m/min into
Row spinning winding, the drawing-off at 70 DEG C, thermal finalization at 110 DEG C obtain high-strength PA6 fibers, fibre strength is through 3.5 times of drawing-offs
8.5cN/dtex。
Claims (10)
1. a kind of preparation method of high-strength daiamid-6 fiber, including：
(1) dibasic acid anhydride and diamine containing phenyl ring are dissolved in solvent respectively, the obtained diamine solution containing phenyl ring instills
In obtained dibasic acid anhydride solution, chain extender is obtained after being filtered, washed, wherein dibasic acid anhydride and the diamine containing phenyl ring rubs
You are than being 1-4:1, a concentration of 5-20g/ml of diamine solution containing phenyl ring, dibasic acid anhydride solution concentration are 5-20g/ml；
(2) in a solvent by hectorite dispersion, silane coupling agent reaction is added, obtains modified hectorite, is dispersed in water, add
Enter unsaturated dibasic acid or unsaturated dicarboxylic acid anhydride, initiator and catalyst reaction, clean, obtains the modification of acid or acid anhydrides grafting
The mass ratio of hectorite, wherein silane coupling agent and hectorite is 0.5-2:1, modified hectorite, unsaturated dibasic acid or not
The mass ratio of monounsaturated dicarboxylic acid acid anhydride, initiator and catalyst is 1：1-2：0.001%-0.3%：0.001%-0.3%, modified
The mass ratio of hectorite and water is 1-5:100, the ratio of hectorite and solvent is 1g：30-100mL；
(3) chain extender in caprolactam and step (1) is mixed, acid or the modification hectorite of acid anhydrides grafting in step (2) is added
Aqueous dispersions, open loop, polycondensation obtains high-strength PA6 compound resins, after spinning drawing, obtains high-strength PA6 composite fibres,
Middle acid or the modification hectorite of acid anhydrides grafting account for the 0.5%-3% of gross mass, and chain extender accounts for the 1%-10% of gross mass, gross mass
For the quality sum of acid or the modification hectorite of acid anhydrides grafting, chain extender and caprolactam.
2. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (1)
Middle dibasic acid anhydride is succinic anhydride or phthalic anhydride；Solvent is acetone.
3. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (1)
In the diamine containing phenyl ring be p-phenylenediamine, 4,4 '-diaminodiphenyl-methanes or 1,5- naphthylenediamines.
4. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (2)
Middle solvent is ethanol water；Silane coupling agent is KH570；Hectorite grain size is 10-50nm；Initiator is ammonium persulfate；It urges
Agent is tetramethylethylenediamine.
5. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (2)
Middle unsaturated dibasic acid is itaconic acid or maleic acid；Unsaturated dicarboxylic acid anhydride is itaconic anhydride or maleic anhydride.
6. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (2)
Middle addition silane coupling agent reacts：It is warming up to 50-70 DEG C of reaction 2-4h.
7. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (2)
Middle addition unsaturated dibasic acid or unsaturated dicarboxylic acid anhydride, initiator and catalyst reaction are：In room temperature reaction 3-5h.
8. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (3)
Middle ring-opening reaction temperature is 240~250 DEG C, and the ring-opening reaction time is 2~6h；Polycondensation reaction temperature is 250~270 DEG C, polycondensation
Reaction time is 3~8h.
9. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step (3)
Middle spinning temperature is 240~260 DEG C, spinning speed 1500-3000m/min.
10. a kind of preparation method of high-strength daiamid-6 fiber described in accordance with the claim 1, which is characterized in that the step
(3) draw conditions are in：Drawing temperature is 50-70 DEG C, and heat setting temperature is 100-120 DEG C, and drafting multiple is 2-4 times.
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