CN103882545B - A kind of high convergency flat acrylic fiber and production method thereof - Google Patents
A kind of high convergency flat acrylic fiber and production method thereof Download PDFInfo
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- CN103882545B CN103882545B CN201410068671.1A CN201410068671A CN103882545B CN 103882545 B CN103882545 B CN 103882545B CN 201410068671 A CN201410068671 A CN 201410068671A CN 103882545 B CN103882545 B CN 103882545B
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Abstract
The present invention relates to a kind of high convergency flat acrylic fiber, this high convergency flat acrylic fiber is grouped into by the one-tenth of following mass percent: acrylonitrile 91-94%, vinyl acetate 6-9%, the length-width ratio of described high convergency flat acrylic fiber is 2-13:1, and shrinkage factor is 26-30%.Its production method includes: acrylonitrile and copolymerization of vinyl acetate preparing polyacrylonitrile dry powder, and dissolves in a solvent, extrude after heating from the rectangular opening of spinneret, double diffusion forms as-spun fibre；As-spun fibre is washed first break draft；Then oil agent；And dry, shape；Finally stretch and prepare high convergency flat acrylic fiber.The present invention is by adjusting acrylonitrile and the content of vinyl acetate, the molecular weight of copolymer and specifically technological process in copolymer, make the soft handle of the high convergency flat acrylic fiber prepared, the flexibility of fiber can be increased, can guarantee that again the highly shrinkable of fiber, resilience, hydrophobicity, spinnability, and acrylic fiber is easily painted.
Description
Technical field
The present invention relates to a kind of flat acrylic fiber, be specifically related to a kind of high convergency flat acrylic fiber and production method thereof.
Background technology
Acrylic fiber (polyacrylonitrile fibre) has the title of artificial wool, have softness, dye bulk, easy, lovely luster, fast light, antibacterial, be not afraid of advantages such as damaging by worms.Good springiness, when extending 20%, rebound degree still can keep 65%, fluffy curling and soft, and warmth retention property is higher by 15% than Pilus Caprae seu Ovis, and intensity is 1.8-4.5cN/dtex, higher 1-2.5 times than Pilus Caprae seu Ovis.Sun-proof function admirable, open-air exposure 1 year, intensity only declines 20%.Fiber softening temperature 190-230 DEG C, acidproof, the antioxidant of energy and common organic solvents, but alkali resistance is poor.Requiring can pure spin or with natural fibre blended according to different purposes, its textile is widely used in the field such as clothing, decoration.And flat acrylic fiber is a kind of cross section is rectangle or the acrylic fiber close to rectangle, flat acrylic fiber has special gloss, bulkiness and anti-pilling property, and has good post-treatment effect.Feel exactly likes touch feather and animal fur, is therefore mainly used as the ornament materials etc. in artificial fur, push toy, interior decoration and car.
And high convergency flat acrylic fiber can make various fabrics with its own potential high convergency performance with conventional flat fiber blend, there is the features such as soft, fabric is abundant, plentiful, warmth retention property is good, the imitation fur made is stood upright and is felt, has stereovision, also can produce unusual luster effect.Therefore, the market demand of high convergency flat acrylic product is increasingly good.Domestic yet there are no produces the technology having high convergency flat acrylic now, and Related product mostly is as external import.And adopting the technology producing the common acrylon of high convergency to produce high convergency flat fiber completely, fiber is easily broken, and shrinkage factor is irregular, and shrinkage factor can only achieve less than 24%.If shrinkage factor is on the low side, finished product feel is not plentiful, show-through, and product style is bad, and the residual deformation of multi-drawing is relatively big, the changeableness such as the knitting cuff of acrylon, neckline, it is impossible to meet user's requirement.
Summary of the invention
Present invention aims to above shortcomings in prior art, it is provided that a kind of shrinkage factor is high, the high convergency flat acrylic fiber of super imitative animal height hair true to nature.
The above-mentioned purpose of the present invention is achieved through the following technical solutions: a kind of high convergency flat acrylic fiber, this high convergency flat acrylic fiber is grouped into by the one-tenth of following mass percent: acrylonitrile 91-94%, vinyl acetate 6-9%, the length-width ratio of described high convergency flat acrylic fiber is 2-13:1, and shrinkage factor is 26-30%.
Polyacrylonitrile macromole without second comonomer tends to closely pile up, and transverse height is orderly, and this structure makes fiber lack elasticity, quality embrittlement, can not carry out super drawing during fiberizing.To this, the present invention adds the vinyl acetate of 6-9% and the acrylonitrile compolymer of 91-94%, destroys the regularity of polyacrylonitrile macromolecular chain so that it is a degree of disordering occurs structure.The addition of vinyl acetate simultaneously reduces the dipole effect between cyano group, reduces the degree of crystallinity of polyacrylonitrile copolymer, makes the flexible reinforced of polyacrylonitrile macromole, and polymeric vitrification point reduces, and flexibility, thermoelasticity, shrinkage factor strengthen.
Further object is that the production method providing a kind of above-mentioned high convergency flat acrylic fiber, this production method comprises the steps:
S1, spinning moulding: the vinyl acetate of the acrylonitrile of 91-94% and 6-9% is carried out under the catalytic action of persulfate and sulphite copolyreaction and prepares polyacrylonitrile dry powder, polyacrylonitrile dry powder is dissolved in solvent dimethyl acetylamide and forms stock solution, stock solution is heated to 82-90 DEG C by heater via, stock solution after heating is extruded from the rectangular opening of spinneret, in coagulating bath, forms as-spun fibre through double diffusion；
S2, washing, drawing-off: through drafting machine drawing-off after being washed by above-mentioned as-spun fibre, during washing, tank temperature is 80-90 DEG C, and washing flow is 3000L/h, and the drafting multiple of drafting machine is 3-6 times, and speed is 30-60m/min；
S3, oil: by the tow oil agent after washing drawing-off, smooth agent, in finishing bathtray, in oil preparation solution, the addition of oil preparation accounts for the 0.25-0.55% of tow gross mass；
S4, drying, sizing: the tow after oiling is dried by hot-rolling at 120-150 DEG C, hot-rolling quantity is 46-50, and tow cooling is curling, is then sent into by tow in sizing pot, 100-150 DEG C, carry out thermal finalization under 300-400KPa and process 30-50min；
S5, high convergency: by the tow after sizing by steam box, when stretch rate is 1.2-1.8:1, tow is stretched, prepare product high convergency flat acrylic fiber.
In step S2 of the present invention, as-spun fibre is after washing drawing-off, and morphosis and the supramolecular structure of fiber there occurs change, and along with the increase of drafting multiple, macromolecular orientation degree increases, and fibrous fracture intensity improves, and ductility declines.Fiber general in prior art, its washing drafting multiple length selects 4.5-6, and the fracture strength of fiber is 2.5-3.0CN/Dtex.If drafting multiple is lower than 2.0, the fracture strength of fiber especially line density can not be guaranteed, and the intensity of fiber only has 1.0CN/Dtex, is unable to undergo super drawing and produces single wire fracture, it is impossible to obtains good shrinkage factor.Must selecting drafting multiple 3-6 times through experimentation, the elongation at break of fiber and fracture strength will be greatly improved.And when the temperature washing drawing-off is too low, drafting process easily occurs brittle fracture；If the temperature of washing drawing-off is too high, fiber plastic deformation is more and more significant, and this partial deformation just can not recover when drying, thus subtracting low-fiber elongation at break, drops low-fiber shrinkage factor.Therefore, the temperature of washing drawing-off is controlled at 80-90 DEG C by the present invention.
High-shrinkage fibre have employed higher heat treatment pressure compared with common acrylic fiber, the fiber that common oil preparation processes just very easily hardens, and hardens, and shrinkage factor is not high, obtaining good solution by the problem increased above the smooth agent of favorable dispersibility, shrinkage factor is good.
Drying, sizing in step S4 play critical effect to producing high convergency flat acrylic fiber, also include crimping procedure after drying.If it is too high to dry temperature, macromole can be made to obtain energy within a certain period of time and fully shrink, result even in more than shrinkage loss most.If drying, temperature is too low can make again moisture regain too high, spins processing and bring difficulty after giving, and therefore drying temperature is controlled at 120-150 DEG C by the present invention.And there is order and change in orientation in heat-setting process in acrylic fiber.Active force main between acrylonitrile copolymer macromole is the dipole force between cyano group, nursing lax more than vitrification point can alleviate the dipole molecule power of some instability that the orientation stress of the high-elastic stretching of structure endogenous cause of ill causes, fiber internal stress is made to disappear, macromole is relatively freely crispaturaed, and the degree of orientation after the richer flexibility thermal finalization of segment decreases.Facts have proved. when will reach identical ductility, the tensile stress that the fiber that heat setting temperature is high needs is just little, and tensile stress is little, then show that segment easily produces motion, therefore steam pressure and the setting temperature of thermal finalization are properly increased, being conducive to producing the elongation based on high elastic deformation, macromole can being made fully to shrink, thus improving the contractility of flat acrylic fiber.
The shrinkage factor of fiber is also had a certain impact by the draw ratio in step S5.If draw ratio is less than 1.2, fiber macromole can not be fully extended, it is impossible to obtains shrinkage factor to greatest extent.
The impact of shrinkage factor is interknited and mutually restricts by above-mentioned each side, is not relatively independent.Only this five aspect is harmonious, just can obtain desirably, and shrinkage factor is high, and fracture strength is high, the high convergency flat acrylic fiber that other performances are all up to standard.
In the production method of above-mentioned high convergency flat acrylic fiber, the molecular weight of polyacrylonitrile dry powder described in step S1 is 60000-100000.
In the production method of above-mentioned high convergency flat acrylic fiber, the persulfate described in step S1 is the one in Ammonium persulfate., potassium peroxydisulfate, and described sulphite is the one in sodium pyrosulfite, sodium sulfite, sodium sulfite.
In the production method of above-mentioned high convergency flat acrylic fiber, in the stock solution described in step S1, polyacrylonitrile dry powder accounts for the 20-25% of gross mass.
In stock solution, polymer content is high, and the solvent that need to remove is just few, it is easy to molding, and fibre density increases, it is easy to keep shape.If polymer content is too low in stock solution, the contact probability between macromole can be reduced, it is impossible to coagulation forming, it is difficult to form flat acrylic fiber.The concentration of polyacrylonitrile dry powder in stock solution is controlled between 20-25% by the present invention, is conducive on the one hand improving yield, is conducive to improving the special-shaped degree of flat acrylic fiber on the other hand.Additionally, stock solution temperature affects the viscoelastic property of stock solution, temperature suitably raises the viscosity and elasticity that can reduce stock solution, reduces spinneret orifice extrusion swelling, improves the special-shaped degree of flat acrylic.But stock solution temperature is too high can cause again flat acrylic fiber to shape excessively fierceness, and dynamic analysis of spinning produces core-skin Rotating fields, affects the physical property of flat acrylic fiber, and therefore, stock solution is heated to 82-90 DEG C by heater via of the present invention.
In the production method of above-mentioned high convergency flat acrylic fiber, the rectangular opening length-width ratio of spinneret described in step S1 is 2-13:1, and the hole count of spinneret is 10000-40000.
The present invention finds through lot of experiments, the rectangular opening length-width ratio of spinneret is controlled at 2-13:1, the hole count of spinneret is 10000-40000, such spinneret can make the flat acrylic fiber prepared compared with dumbbell shaped, its quality uniformity is better, and emulation property is higher, and flexibility is more preferably, resilience is better, thus improve feel and the shrinkage factor of fiber.Subregion distribution is conducive to coagulating bath even into spinneret inside and fiberizing, inside and outside uniformity, and the uniformity of fiber is also better.And the empty of spinneret causes coagulating bath skewness too much, fiberizing is uneven, affects fiber quality；Hole count very little, yields poorly, and cost is high.
In the production method of above-mentioned high convergency flat acrylic fiber, entering the temperature of stock solution during coagulating bath and be 80-90 DEG C in step S1, coagulation bath temperature is 30-45 DEG C, and coagulating bath solvent strength is 30-50%, and circulating load is 28-35kL/h.
When coagulating bath concentration is too high, double diffusion process is excessively slow, causes coagulation forming difficulty, not easily fag end, and molding is insufficient, and fracture of wire increases, and fiber surface solidification is bad, forms doubling, and fabric hand is thick and stiff, and intensity reduces.But when coagulating bath concentration is too low, double diffusion process is accelerated, and the solidification making fiber sheath is excessively fierce, forms brittle cortex at stock solution thread outer layer, the tensility of fiber declines, and causes fiber to produce cavity, easy fracture and produce lousiness, wiriness, color and luster whitens, and slight and degree of stretching all declines.
Same, the temperature of coagulating bath affects the diffusion velocity of coagulator and solvent, thus affecting forming process.Through experimental study, between coagulation bath temperature is 30-45 DEG C, along with the reduction of coagulation bath temperature, setting rate declines, and coagulation forming ratio is more uniform, and intensity raises.When the temperature of coagulating bath is excessive, diffusion coefficient increases, and process of setting accelerates, it is easy to form sclerocortex, produces lousiness, makes the decrease in strength of acrylic fiber.
In fiber formation process, owing to stock solution temperature is higher than coagulating bath, cause bath temperature rise, and coagulation bath temperature and concentration directly affect the molding effect of fiber, therefore it is necessary to constantly circulate, ensure that coagulating bath concentration and temperature are relative stable in certain scope, the quality of guarantee acrylic fiber.When solidifying same bath flow is too little, the concentration of different parts in coagulating bath and thermograde difference being made to increase, acrylic fiber shapes inequality, can cause fracture of wire time serious.
In sum, by constantly test, the present invention show that the temperature of coagulating bath is 30-45 DEG C, coagulating bath solvent strength is 30-50%, and when circulating load is 28-35kL/h, the molding of flat acrylic fiber is good, and performance is good.
It is preferred that, during described entrance coagulating bath, the temperature of stock solution is 80-85 DEG C, and coagulation bath temperature is 30-40 DEG C, and coagulating bath solvent strength is 30-45%, and circulating load is 30-32kL/h.
In the production method of above-mentioned high convergency flat acrylic fiber, in the finishing bathtray described in step S3, in oil preparation solution, the addition of oil preparation accounts for the 0.3-0.5% of tow gross mass.Described oil preparation is the compound of nonionic surfactant and cationic surfactant, described nonionic surfactant, cationic surfactant, smooth agent mol ratio be 1:(1-3): (0.1-0.5).Wherein, described nonionic surfactant is alkylphenol polyoxyethylene, high-carbon fatty alcohol polyoxyethylene ether, one in polyoxyethylene carboxylate, described cationic surfactant is quaternary cationic surfactant, such as alkyl trimethyl ammonium salt type surfactant, dialkyl dimethyl ammonium salt type surfactant, alkyl dimethyl benzyl ammonium salt type surfactant, pyridine salt type surfactant, alkylisoquinolinium ammonium type surfactant, one or more in benzyl chloride ammonium salt type surfactant, described smooth agent is cationic paraffin wax emulsions.
It is known that the moisture pick-up properties of chemical synthetic fiber is poor, acrylon are 20 DEG C in temperature, and when relative humidity is 65%, regain only has 1.2%-2%, and mass specific resistance is 1014Ω*g/cm2, due to few containing the number of hydrophilic radical carboxyl in acrylon macromolecular chain, so the water absorbing properties of fiber is poor, conductive capability is poor.Acrylon surface does not have oils and fats, and in fiber, cyano group polarity is relatively strong, therefore fiber surface intermolecular force is relatively big, and coefficient of friction is bigger.Electrification phenomenon in various degree will be produced during friction between fiber and fiber or between fiber and machinery so that it is fluffy in post-treatment, chaotic, sometimes also can be adsorbed on equipment, be wound around, processing difficulties.For reducing frictional force and electrostatic effect, prior art is typically in fiber and applies oil preparation or antistatic additive, and the compound that oil preparation is nonionic surfactant and cationic surfactant that the present invention selects when adding oil preparation, it is simultaneously introduced the smooth agent of cationic paraffin wax emulsions, fiber and interfibrous adhesion can be prevented, acrylic fiber is made to have soft and smooth feel, improve elasticity, improve antistatic effect, and increase the cohesive force between fiber to a certain extent, improve the shrinkage factor of fiber, make fiber post-treatment to be smoothed out.
In the production method of above-mentioned high convergency flat acrylic fiber, the steam the temperature inside the box described in step S5 is 100-150 DEG C.
Compared with prior art, present invention have the advantage that
1, low-fiber vitrification point, drops in the molecular weight of present invention content and copolymer by adjusting acrylonitrile and vinyl acetate in copolymer, the flexibility of fortifying fibre and thermoelasticity, improves the contractility of fiber, makes acrylic fiber be easier to colouring.
2, the present invention is by adjusting the concentration of stock solution, temperature, the concentration of solidification liquid, temperature, circulating load, Reasonable adjustment washing temperature, drafting multiple, and control temperature, the pressure drying, shape, and the technological parameter such as the draw ratio of high convergency, the contractility making flat acrylic fiber of the present invention is high, soft, rigidity is strong, and resilience, bulkiness, spreadability, hydrophobicity, spinnability are good.
3, appropriate design of the present invention spinneret, the technological process making production is smooth and easy, and the emulation of flat acrylic fiber is high, makes the soft handle of the flat acrylic fiber prepared, can increase flexibility and the feel of fiber, can guarantee that again the contractility of fiber and resilience.
Specific embodiment
The following is specific embodiments of the invention, technical scheme is further described, but the present invention is not limited to these embodiments.
Embodiment 1: preparation 3D high convergency flat fiber
Spinning moulding: the vinyl acetate of the acrylonitrile of 91-94% and 6-9% is carried out under the catalytic action of persulfate and sulphite copolyreaction and makes the polyacrylonitrile dry powder that molecular weight is 60000-100000, be dissolved in by polyacrylonitrile dry powder in solvent dimethyl acetylamide forming concentration is the stock solution of 20-25%, stock solution is heated to 82-90 DEG C by heater via, stock solution after heating is extruded from the rectangular opening of spinneret, in coagulating bath, forms as-spun fibre through double diffusion；Wherein, entering the temperature of stock solution during coagulating bath and be 80-90 DEG C, the temperature of coagulating bath is 30-45 DEG C, and in coagulating bath, the concentration of solvent dimethyl acetylamide is 30-50%, and circulating load is 28-35kL/h.Described spinneret is the rectangular slab of long 113mm, wide 55mm, and rectangle orifice length is 0.20mm, Kong Kuanwei 0.020mm, and the hole count of spinneret is 38000-40000 hole.
Washing and drawing-off: through drafting machine drawing-off after being washed by above-mentioned as-spun fibre, tank temperature is 80-100 DEG C, and washing flow is 3000L/h, and the drafting multiple of drafting machine is 3-6 times, and fibre bundle speed is 30-60m/min.
Oil: by the tow oil agent after washing drawing-off and smooth agent；Wherein, in described finishing bathtray, in oil preparation solution, the addition of oil preparation accounts for the 0.35% of tow gross mass, described oil preparation is the compound of nonionic and cationic surfactant, described nonionic surfactant is alkylphenol polyoxyethylene, described cationic surfactant is alkyl trimethyl ammonium salt type surfactant, described smooth agent is cationic paraffin wax emulsions, described nonionic surfactant, cationic surfactant, smooth agent mol ratio be 1:2:0.5.
Dry, shape: by hot-rolling, the tow after oiling is dried 15min at 130 DEG C, and hot-rolling quantity is 50, and tow cooling is curling, then tow is sent in sizing pot, under 370KPa, carry out thermal finalization process 30min.
High convergency: by the tow after thermal finalization by the steam box that temperature is 120 DEG C, when stretch rate is 1.6:1, tow is stretched, curling post processing obtains final products high convergency flat acrylic fiber.
Embodiment 2: preparation 5D high convergency flat fiber
Spinning moulding: the vinyl acetate of the acrylonitrile of 91-94% and 6-9% is carried out under the catalytic action of persulfate and sulphite copolyreaction and makes the polyacrylonitrile dry powder that molecular weight is 60000-100000, be dissolved in by polyacrylonitrile dry powder in solvent dimethyl acetylamide forming concentration is the stock solution of 20-25%, stock solution is heated to 82-90 DEG C by heater via, stock solution after heating is extruded from the rectangular opening of spinneret, in coagulating bath, forms as-spun fibre through double diffusion；Wherein, entering the temperature of stock solution during coagulating bath and be 80-90 DEG C, the temperature of coagulating bath is 30-45 DEG C, and in coagulating bath, the concentration of solvent dimethyl acetylamide is 30-50%, and circulating load is 28-35kL/h.Described spinneret is the rectangular slab of long 113mm, wide 55mm, and rectangle orifice length is 0.275mm, Kong Kuanwei 0.025mm, and the hole count of spinneret is 20000-28000 hole.
Washing and drawing-off: through drafting machine drawing-off after being washed by above-mentioned as-spun fibre, tank temperature is 80-100 DEG C, and washing flow is 3000L/h, and the drafting multiple of drafting machine is 3-6 times, and fibre bundle speed is 30-60m/min.
Oil: by the tow oil agent after washing drawing-off and smooth agent；Wherein, in described finishing bathtray, in oil preparation solution, the addition of oil preparation accounts for the 0.35% of tow gross mass, described oil preparation is the compound of nonionic and cationic surfactant, described nonionic surfactant is alkylphenol polyoxyethylene, described cationic surfactant is alkyl trimethyl ammonium salt type surfactant, described smooth agent is cationic paraffin wax emulsions, described nonionic surfactant, cationic surfactant, smooth agent mol ratio be 1:2:0.5.
Dry, shape: by hot-rolling, the tow after oiling is dried 5min at 130 DEG C, and hot-rolling quantity is 50, and tow cooling is curling, then tow is sent in sizing pot, under 390KPa, carry out thermal finalization process 30min.
High convergency: by the tow after thermal finalization by the steam box that temperature is 130 DEG C, when stretch rate is 1.8:1, tow is stretched, curling post processing obtains final products high convergency flat acrylic fiber.
Choosing the high convergency flat acrylic fiber prepared in embodiment 1-2 and carry out performance test, test result is as shown in table 1.
Table 1: the performance test results of high convergency flat acrylic fiber in embodiment 1-2
As seen from Table 1, the shrinkage factor of the flat acrylic fiber of the present invention is high, easily paints, soft, and rigidity is strong, and resilience, bulkiness, spreadability, hydrophobicity, spinnability are good.
Comparing after the high convergency flat acrylic fiber prepared in embodiment of the present invention 1-2 is carried out feel test by test group and with matched group (common acrylic fiber), test result is as shown in table 2.
Table 2: the high convergency flat acrylic fiber prepared in embodiment of the present invention 1-2 compares with the feel of common acrylic fiber
| Sample | Feel |
| Embodiment 1 | 4.7 |
| Embodiment 2 | 4.6 |
| Matched group | 3.3 |
Feel is the 10 people groups score averages by group each after dividing scoring by 1-5 after testing, and 5 are divided into full marks.As known from Table 2, the high convergency flat acrylic fiber of the present invention is more soft than common acrylic fiber, fine and smooth, and feel is more preferably.
Specific embodiment described herein is only to present invention spirit explanation for example.Described specific embodiment can be made various amendment or supplements or adopt similar mode to substitute by those skilled in the art, but without departing from the spirit of the present invention or surmount the scope that appended claims is defined.
Although the present invention has made a detailed description and has quoted as proof some specific embodiments, but to those skilled in the art, as long as it is obvious for can making various changes without departing from the spirit and scope of the present invention or revise.
Claims (8)
1. the production method of a high convergency flat acrylic fiber, it is characterised in that this production method comprises the steps:
S1, spinning moulding: the vinyl acetate of the acrylonitrile of 91-94% and 6-9% is carried out under the catalytic action of persulfate and sulphite copolyreaction and prepares polyacrylonitrile dry powder, polyacrylonitrile dry powder is dissolved in solvent dimethyl acetylamide and forms stock solution, stock solution is heated to 82-90 DEG C by heater via, stock solution after heating is extruded from the rectangular opening of spinneret, in coagulating bath, forms as-spun fibre through double diffusion；
S2, washing, drawing-off: through drafting machine drawing-off after being washed by above-mentioned as-spun fibre, during washing, tank temperature is 80-90 DEG C, and washing flow is 3000L/h, and the drafting multiple of drafting machine is 3-6 times, and speed is 30-60m/min；
S3, oil: by the tow oil agent after washing drawing-off and smooth agent, described oil preparation is the compound of nonionic surfactant and cationic surfactant, described nonionic surfactant, cationic surfactant, smooth agent mol ratio be 1:(1-3): (0.1-0.5), in finishing bathtray, in oil preparation solution, the addition of oil preparation accounts for the 0.25-0.55% of tow gross mass；
S4, drying, sizing: the tow after oiling is dried by hot-rolling at 120-150 DEG C, hot-rolling quantity is 46-50, and tow cooling is curling, is then sent into by tow in sizing pot, 100-150 DEG C, carry out thermal finalization under 300-400kPa and process 30-50min；
S5, high convergency: by the tow after sizing by steam box, when stretch rate is 1.2-1.8:1, tow is stretched, prepare product high convergency flat acrylic fiber.
2. the production method of high convergency flat acrylic fiber according to claim 1, it is characterised in that the molecular weight of polyacrylonitrile dry powder described in step S1 is 60000-100000.
3. the production method of high convergency flat acrylic fiber according to claim 1, it is characterized in that, persulfate described in step S1 is the one in Ammonium persulfate., potassium peroxydisulfate, and described sulphite is the one in sodium pyrosulfite, sodium sulfite, sodium sulfite.
4. the production method of high convergency flat acrylic fiber according to claim 1, it is characterised in that in the stock solution described in step S1, polyacrylonitrile dry powder accounts for the 20-25% of gross mass.
5. the production method of high convergency flat acrylic fiber according to claim 1, it is characterised in that the rectangular opening length-width ratio of spinneret described in step S1 is 2-13:1, the hole count of spinneret is 10000-40000.
6. the production method of high convergency flat acrylic fiber according to claim 1, it is characterized in that, entering the temperature of stock solution during coagulating bath in step S1 and be 80-90 DEG C, coagulation bath temperature is 30-45 DEG C, coagulating bath solvent strength is 30-50%, and circulating load is 28-35kL/h.
7. the production method of the high convergency flat acrylic fiber according to claim 1 or 6, it is characterized in that, entering the temperature of stock solution during coagulating bath in step S1 and be 80-85 DEG C, coagulation bath temperature is 30-40 DEG C, coagulating bath solvent strength is 30-45%, and circulating load is 30-32kL/h.
8. the production method of high convergency flat acrylic fiber according to claim 1, it is characterised in that the steam the temperature inside the box described in step S5 is 100-150 DEG C.
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