CN100445433C

CN100445433C - Dry spinning process of making bright polyacrylic fibre

Info

Publication number: CN100445433C
Application number: CNB2005100607443A
Authority: CN
Inventors: 姚家华; 张宇飞; 丁国伟; 邹忠伟; 张露朝; 黄志强
Original assignee: Zhejiang Jinyong Acrylic Co ltd
Current assignee: Zhejiang Jinyong Acrylic Co ltd
Priority date: 2005-09-09
Filing date: 2005-09-09
Publication date: 2008-12-24
Anticipated expiration: 2025-09-09
Also published as: CN1740411A

Abstract

The present invention relates to a method for making a dry spinning large bright acrylic fiber. The original spinning shaping after-treatment technology is improved, the water washing temperature is controlled within 96 to 100 DEG C in a water washing process and a drafting process, the drafting multiple is lowered at 2.65 to 4.5 times, the drafting rate is lowered at 230 to 360 M / min, and the drying temperature and the steam flow in a drying process after the water washing process and the drafting process are enhanced simultaneously. The present invention not only ensures that molecular chains have enough stretching time, but also prevents the molecular chains from damage, and thereby, the present invention reduces the roughness and the damage degree of fiber surfaces and increases the fineness and the densification degree of fibers to make the made fibers luster and bright so as to meet the requirement for fiber brightness by the Chinese industry of leather, costume, etc., and the made fibers can completely replace imported products.

Description

The manufacture method of dry spinning bright polyacrylic fibre

Technical field

The present invention relates to a kind of method of dry fabrication acrylic fiber, particularly a kind of manufacture method of dry spinning bright polyacrylic fibre.

Background technology

Though China has just introduced the production technology of du pont company dry production acrylic fiber at the mid-80, therefore the parameter in the production technology is perfect not enough, reasonable, fiber surface when moulding is torn hinder seriously, thereby cause the smoothness of fiber surface, fineness to descend, so acrylic fiber luminance difference with this method production, can't satisfy with acrylic fibers is raw material production underwear, clothes and the demand of making industries such as Fake Furs, woollen blanket, and domestic every profession and trade now still needs the dependence on import raw material to produce.

Number of patent application 200410018616.8 " the dry acrylic fiber fiber production method that contains vinylacetate " is only studied the raw material in Du Pont's production technology, solved raw material problem in short supply, found better substitute, at the production cost that effectively reduces acrylic fibers, improved the spinnability of fiber, improve on the dyeability of fiber and made major contribution, but its still unresolved light requirement to fiber, can't satisfy with the acrylic fiber is the demand of the every profession and trade of raw material.

Summary of the invention

Technical problem to be solved by this invention is: the manufacture method that a kind of dry spinning bright polyacrylic fibre is provided, by improving brightness, the light transmission that original spinning moulding aftertreatment technology improves fiber, the acrylic fiber gloss that method is thus produced is bright, satisfy industry users' such as Fake Furs, clothes requirement, the substituting import one product uses fully.

The present invention addresses the above problem the technical scheme that is adopted, and the preparation method of dry spinning bright polyacrylic fibre may further comprise the steps:

A, preparation spinning solution: with polyacrylonitrile dry powder (PAN) is raw material, is that solvent mixes in Marko's mixer with dimethyl formamide (DMF), is mixed with polymer concentration and is 30～35% polymer spun silk stock solution, adds light-colored agent simultaneously and filters stand-by;

B, spinning technique: with above-mentioned stoste filtered fluid heater via heating, make the inboard temperature of heater be controlled at 130～145 ℃, temperature outside is controlled at 115～130 ℃, enter filament spinning component after the heating, the stoste thread that forms by the circular or special-shaped spinneret orifice on the spinnerets enters the path, the path temperature is controlled at 320～420 ℃ of visor oven temperature, degree from top to bottom successively, 210～270 ℃ of conical part temperature, 190～240 ℃ of last path upper temps, 160～210 ℃ of last path temperature of lower, by the solvent in the hot nitrogen vaporizing raw liquor thread, the path nitrogen flow is 110～180kg/h, nitrogen temperature is 320～420 ℃, and sprays tow at the spray chamber place with the cold rare solvent that contains DMF, obtains as-spun fibre;

C, washing, drawing-off: through washing, drawing-off, drawing machine tank temperature is 92～100 ℃ with above-mentioned tow, and drafting multiple is 2.2～4.5 times, and draft speed is 230～360m/min, oils, folds silk, decatize then, curls, cools off and carry the back barrelling.

D, drying: through the tow after the washing drawing-off, carry out the tension force that fiber oiled, adjusted fiber once more, enter cutting machine at last, the fiber that is cut into the required length of user is sent into drying machine, drying machine decatize boots steam flow is controlled at 1500～2000kg/h, baking temperature is controlled at 125～140 ℃, and dryness finalization is made dry method the light acrylic fiber greatly.

Compared with prior art, the invention has the advantages that: in-problem technological parameter in the existing production technology is done to improve targetedly, adjust, mainly be that tow to spinning technique carries out post processing, in washing, in the drafting process, improving washing drawing machine tank temperature is 96～100 ℃, the temperature of drawn fiber is reached on the vitrification point, guarantee the freely-movable of fiber macromolecular chain in drawing process, simultaneously, by reducing drafting multiple, now being that 2.65～4.5 multiple proportions are original reduces by 1.5～0.3 times, and reducing draft speed now is 230～360m/min, than original reduction by 45～220m/min.Guarantee that strand has the enough stretching, extension time, avoid causing the damage of strand, thereby reduce the roughness and the degree of injury of fiber surface, improved the fineness of fiber surface, reach the purpose that improves fiber gloss, brightness.Meanwhile adjust again and improved 5～10 ℃ of drying machine steam flow 20% after washing, the drawing-off, baking temperatures, promote the microgap of fibrous inside to shrink, merge, reduced the cavity of fibrous inside, thereby improved the densification degree of fiber, reduce the devitrification of fiber, improve the light transmission of fiber.So the acrylic fibers gloss that makes is bright, through on probation, the brightness of fiber has surpassed imported product, can satisfy the demand of every profession and trade in the domestic market, can replace imported product and use.

The specific embodiment

Embodiment is further described the present invention below in conjunction with accompanying drawing.

A prepares spinning solution

Polyacrylonitrile dry powder PAN and solvent DMF are fully mixed in Marko's mixer, are mixed with polyacrylonitrile concentration and are 33 ± 1% spinning solution, add an amount of light-colored agent simultaneously, and filter;

The B spinning technique

The filtered fluid of above-mentioned stoste directly is pressed into filament spinning component with pump, stoste forms the stoste thread through the spinneret orifice in the assembly and enters spinning shaft, in the path, solution D MF in the rapid vaporizing raw liquor thread of hot nitrogen, make the stoste thread solidify the formation silk thread, and spray tow with the rare solvent of cold DMF at mouth spray chamber place, path;

Adopt circle or irregularly-shaped hole spinnerets, hole count is 1000～3000, dry spinning path length is 5.5m, diameter 28cm, the nitrogen of the inner logical heat in path, the outside, path is with heater, control path temperature, at this moment, the inboard temperature of heater is at 136 ± 1 ℃, temperature outside is controlled at 125 ± 1 ℃, and the path temperature is followed successively by from top to bottom: 340 ± 10 ℃ of visor oven temperature, degree; 240 ± 10 ℃ of conical part temperature, last path upper temp is 210 ± 10 ℃, and last path temperature of lower is 180 ± 10 ℃, and the path nitrogen flow is 130 ± 10kg/h, 380 ± 10 ℃ of nitrogen temperatures, path productive rate 37～50kg/h obtains as-spun fibre.

C washing, drawing-off

Above-mentioned as-spun fibre is carried out boundling, guide to washing drawing-off combination machine and wash drawing-off, washing drawing-off groove temperature must be controlled at 96 ℃～100 ℃, the multiple of washing drawing-off is 2.65～4.5 times, draft speed is 310 ± 30m/min, after the washing of fiber process, the drawing-off, oil, fold silk, decatize, curl, cool off conveying back barrelling.

The D drying

Pass through silk guide frame through the tow after the washing drawing-off, carry out the tension force that fiber oiled, adjusted fiber once more, enter cutting machine at last, be cut into the fiber of the required length of user, fiber is fallen the feeding feed bin of staple fibre by minute silk device, fiber is evenly sent on the carrier bar of dryer through promoting oblique curtain and fiber stripping roller, fiber delivers into the decatize boots by carrier bar, and decatize boots steam flow is controlled at 1800 ± 200kg/h; Fiber enters dry section subsequently, and baking temperature is controlled at 127 ℃～137 ℃, and last staple fibre process wind send, opener, and after the strict processing of these operations, can obtain dry method has the light acrylic fiber greatly.

This fiber surface is smooth, do not have significantly to tear damage, and the brightness height, soft, fracture strength 〉=2.2CN/dtex, extension at break 30%～50%, crispation number 〉=28/10cm.

Claims

1, a kind of preparation method of dry spinning bright polyacrylic fibre is characterized in that: may further comprise the steps:

A, preparation spinning solution: with polyacrylonitrile dry powder is raw material, is that solvent mixes in Marko's mixer with the dimethyl formamide, is mixed with polymer concentration and is 30～35% polymer spun silk stock solution, adds light-colored agent simultaneously and filters stand-by;

B, spinning technique: with above-mentioned stoste filtered fluid heater via heating, make the inboard temperature of heater be controlled at 130～145 ℃, temperature outside is controlled at 115～130 ℃, enter filament spinning component after the heating, the stoste thread that forms by the circular or special-shaped spinneret orifice on the spinnerets enters the path, the path temperature is controlled at 320～420 ℃ of visor oven temperature, degree from top to bottom successively, 210～270 ℃ of conical part temperature, 190～240 ℃ of last path upper temps, 160～210 ℃ of last path temperature of lower, by the solvent in the hot nitrogen vaporizing raw liquor thread, the path nitrogen flow is 110～180kg/h, nitrogen temperature is 320～420 ℃, and sprays tow at the spray chamber place with the cold rare solvent that contains dimethyl formamide, obtains as-spun fibre;

C, washing, drawing-off: through washing, drawing-off, drawing machine tank temperature is 96～100 ℃ with above-mentioned tow, and drafting multiple is 2.65～4.5 times, and draft speed is 310 ± 30m/min, oils, folds silk, decatize then, curls, cools off and carry the back barrelling;

D, drying: through the tow after the washing drawing-off, carry out the tension force that fiber oiled, adjusted fiber once more, enter cutting machine at last, the fiber that is cut into the required length of user is sent into drying machine, drying machine decatize boots steam flow is controlled at 1800 ± 200kg/h, baking temperature is controlled at 127～137 ℃, and dryness finalization is made dry method the light acrylic fiber greatly.