CN102560706A - Preparation method of low-melting-point hot-melting tynex - Google Patents
Preparation method of low-melting-point hot-melting tynex Download PDFInfo
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- CN102560706A CN102560706A CN2012100519194A CN201210051919A CN102560706A CN 102560706 A CN102560706 A CN 102560706A CN 2012100519194 A CN2012100519194 A CN 2012100519194A CN 201210051919 A CN201210051919 A CN 201210051919A CN 102560706 A CN102560706 A CN 102560706A
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Abstract
The invention discloses a preparation method of low-melting-point hot-melting tynex, which is characterized by including process steps of slicing,drying,spinning,drawing nylon, and the like. In the drying step, drying temperature ranges from 50 DEG C to 70 DEG C, and drying time ranges from 12 hours to 20 hours. In the spinning step, spinning is realized through a spinning screw, and the temperature of the spinning step is in different control in different areas, the temperature areas include a screw area, a metering pump area, a bend area and a spinning box area, wherein the temperature of the screw area ranges from 180 DEG C to 225 DEG C, the temperature in the spinning box ranges from 200 DEG C to 235 DEG C, and spinning speed is 500-800 meters per minute; spinning oil with weight ratio concentration of 20% is added during spinning, the temperature of a heating plate ranges from 45 DEG C to 55 DEG C and the forming temperature of a heating plate ranges from 55 DEG C to 65 DEG C during drawing, and the drawing magnification ranges from 3.2 to 3.6. The low-melting-pint hot-melting tynex prepared by the preparation method is not easy to break or to be fuzzy, is not easy to be loose, free of edge turned down after winding and smooth in spinning, and breakage strength and linear density thereof meet the requirements after weaving.
Description
Technical field
The present invention relates to a kind of nylon material spinning field, specially refer to the preparation method of low melting point hot melt Tynex.
Background technology
In general, can the weave macromolecular material of usefulness comprises nylon (polyamide), polypropylene, PETG and polyacrylonitrile etc.These materials can form fiber and nylon, polypropylene fibre, terylene and acrylic fibers etc. through spinning process, thereby are used for textile industry.A kind of spinning process commonly used during melt spinning is through melt spinning can obtain being suitable for weaving each fibrid of usefulness.Usually, use the filament number of the fiber that melt spinning method obtains to reach 1.0dtex.With the fibrous woven of such fiber number product, for example garment material etc. have lot of advantages, so the application market space is wide.
Yet, the Along with people's growth in the living standard, also increasingly high for the requirement of textiles, be starved of can client's textiles some existing defectives.The for example above-mentioned products of mentioning such as garment material and since its filament thick therefore exist feel coarse, be prone to problem such as lousiness.
At present, carried out a lot of preparation methods about textile fabric, relevant information is CN101734633A, CN101768789A at publication number.All describe to some extent in the Chinese patent document of CN102161755A, CN102161756A.
But as far as nylon fiber, the technology of operation fusion direct fabrics method still is not very ripe.Characteristics such as the nylon fiber fabric has absorbing sweat, lightweight, toughness is good, resilience good, antiacid alkali are best suited for one of man-made fabric of human dress.Application on clothes also is one of main application of nylon fiber.Up to the present, the research report that improves the nylon spinnability through modification mode is also few, thereby the main aspect of modification is through copolymerization or adds auxiliary agent and reduce the extension ability that the molecularly oriented of nylon when reeling improves monofilament.For example introduce asymmetric cell,, add asymmetric binary acid, diamine during like common nylon polymerization or with the caprolactam and the assorted hexane of azo-cycle of side group to reduce the ability of molecularly oriented through copolymerization; When spinning, add acrylic acid derivative, like the methyl methacrylate polyester; Adopt long-chain nylon to carry out spinning or adding long-chain nylon and salt etc. thereof when the monomer polymerization of matrix nylon.
Particularly for the nylon material of low melting point hot melt; Owing to have the characteristics of fusion adhesion; Can be widely used in the fixing of carbon fiber one-way cloth, basalt fibre unidirectional cloth, glass fibre unidirectional cloth etc., sewing thread, clothes; Rope, band, line be the twist etc. fixedly, and it is very important selecting the technical scheme of spinning and each item technical process such as strict control spinning, stretching.In spinning process, be strict for the control of temperature, spinning speed, these control of process condition directly have influence on spinning quality.
Summary of the invention
In view of the deficiency that background technology exists, the technical problem that the present invention will solve provides the good spinning process of a kind of spinning quality preparation method of low melting point hot melt Tynex smoothly.
For this reason, the present invention adopts following technical scheme to realize: a kind of preparation method of low melting point hot melt Tynex is characterized in that comprising the steps:
A), nylon chips is dry; Adopt the vacuum drum mode dry, its baking temperature is 50～70 degrees centigrade, and be 12～20 hours drying time;
B), spinning; Said spinning adopts spinning screw to carry out; And its temperature subregion control; Said temperature subregion is screw rod district, measuring pump district, bend pipe district and manifold tagma; Wherein the temperature in the screw rod district is 180～225 degrees centigrade, and the temperature in spinning manifold is 200～235 degrees centigrade, and spinning speed is 500～800 meters of per minutes; And when spinning, to add weight ratio concentration be 20% spinning oil;
C), stretch; During stretching, the temperature of heat dish is 45～55 degrees centigrade, and the setting temperature of hot plate is 55～65 degree; Stretching ratio is between 3.2～3.6.
In the said step c), reel after the stretching, adopt the overfeeding mode during coiling, overfeed ratio is between 2～5%.
This Tynex preparation method of the present invention, prepared long filament is difficult for broken end and produces lousiness, and whole spinning process is smooth, is difficult for loose winding behind the coiling and collapses the limit, and the fracture strength of spinning product and line density all reach knits the back requirement.
The specific embodiment
The preparation method of this low melting point hot melt Tynex comprises nylon chips drying, spinning, stretching and winding process step.Be that example specifies below with the POLYAMIDE YARNS:
The vaporization hydrolysis will take place in the nylon chips of undried, its contained moisture content under high temperature fused state, thereby will make the molecular weight and molecular weight of polymer, show as viscosity and reduce the intensity decreases of product.In addition, because the cavity filament that the moisture content vaporization forms will cause spinning broken end or burr.Therefore, the good low melting point hot melt Tynex of obtained performance, one of main points are before spinning, sufficient drying to be carried out in section, and the moisture content of section is dropped to below 0.03%, and this operation is very crucial.But because the softening point of low melting point nylon section is far below the boiling point of water, temperature is too high when dry, and section very easily sticks together when being heated.Therefore, the drying of section has proposed higher requirement to the requirement of technology and equipment.At first, can must adopt the higher vacuum drum mode of accuracy of temperature control carry out drying high as far as possible and remove as early as possible under the temperature do not broken through for the moisture content in guaranteeing to cut into slices to section.Heating rate should be slow as far as possible and accurate, in case temperature overshot.However,, therefore can only adopt lower temperature, carry out drying, reach technological requirement with the moisture content of guaranteeing to cut into slices through the mode that prolongs drying time because the fusing point of section is lower.Through long-term test, baking temperature is with 70 ℃, and drying time is more suitable with 12 hours.
Because the softening point of copolymerization hot melt nylon is very low, and viscosity is very high.Therefore, obtain good hot melt Tynex, the technology control control of spinning temperature, cooling condition and winding shaping operation is very crucial.
Spinning temperature is a melt temperature, and during spinning, melt temperature must be higher than the fusing point of section and be lower than its decomposition temperature.Though because low melting point nylon food slicer fusing point is low, its viscosity is not low, therefore when selecting spinning temperature, must takes all factors into consideration the factor of each side, and specifically confirm, to guarantee good spun row according to polymer properties.
Because the viscosity of low melting point nylon melt is high, the row that flows is relatively poor, therefore must suitably improve spinning temperature.On the one hand, higher spinning temperature can the high mountain melt through the rheological property of spinneret orifice, improve the just surface temperature of spinnerets the cool time that can delay the melt thread on the other hand, can improve the spun row of section.The too high problems such as viscosity descends greatly, monomer volatilization of can bringing again of single temperature make and can spin capable variation.
The selection that temperature is respectively distinguished in spinning mainly takes in according to the fusing point of cutting into slices, inherent viscosity etc. comprehensively.Said spinning adopts spinning screw to carry out; And its temperature subregion control; Said temperature subregion is screw rod district, measuring pump district, bend pipe district and manifold tagma, and wherein the temperature of spinning manifold is the most key to the melt spinning shaping, and the fluctuation of spin manifold temperature is with the spun row of direct impact polymer.Screw rod one district is a feed zone, and the too high section of temperature will be softened adhesion too early, cause the loops resistance material easily, and raw material can not be got into smoothly, thereby spinning can't normally be carried out.Take all factors into consideration above various factors, through a large amount of experiments, the temperature in screw rod district is set to 180～225 degrees centigrade, and the temperature in spinning manifold is 200～235 degrees centigrade, and whole like this spinning process is smooth, for loops resistance material and broken end lousiness phenomenon take place.Because the drying of low melting point nylon is difficulty very, though the frequent time is dry, single section moisture content is often still than higher.If adopt high-speed spinning, then break end easily, not only spinning can not be carried out smoothly, and product quality also can't be guaranteed.Through evidence, the spinning speed of low melting point nylon is the most suitable with 500～800 meters/minute.Therefore low melting point nylon very easily absorbs airborne moisture content owing to contain a large amount of suction groups, makes the fibre length behind the coiling change, form loose winding and the limit phenomenon of collapsing, and causes difficulty to debatching, has a strong impact on product quality.The concentration proportioning of spinning oil and last oil mass also are one of key factors of spinning success or failure for this reason.This fiber can adopt conventional nylon spinning oil, and model is THL-PA-810, on market, all can buy, and the weight concentration proportioning is advisable with 20%.Because the undrawn yarn of under low spinning speed, obtaining, its strand be full extension not as yet, so the strength ratio of fiber is lower, size is also unstable.Need undrawn yarn be stretched through drawing machine for this reason, make the intensity of fiber be able to into once improve.During stretching, cross when low when draft temperature, because strand is difficult for sliding, the stress of tensile deformation is bigger, is easy to generate lousiness.Improve draft temperature, then tensile stress reduces, and what help stretching carries out smoothly, and can improve the intensity of fiber.But when temperature is too high, though tensile stress diminishes, big molecule will take place lax and disorientation, and its result makes the intensity of fiber descend to some extent on the contrary.In order fiber not to be sticked together and to break end, make the abundant HEAT SETTING of fiber again, guarantee its intensity, through experiment showed, under 500～800 meters/minute draw speed condition in a large number, the temperature of heat dish is with 50 ℃, and the setting temperature of hot plate is advisable with 60 ℃.
Stretching ratio depends primarily on the residual elongation rate of precursor and to the index request of product silk.Spinning temperature and spinning speed are all influential to the stretching ratio of fiber.Spinning speed is high, and the residual stretch rate of precursor is low, and then corresponding stretching ratio just should reduce.Along with the raising of stretching ratio, tensile stress will increase thereupon, the slightly also raising thereupon of tow, and extension at break then will reduce.Through a large amount of experiments, under 500～800 meters/minute spinning speed, stretching ratio is to be advisable between 3.2～3.6.
In addition, because the resilience of nylon fiber is higher, the tow behind the drawn can produce on mound bobbins and shrink, and makes the shaping of bobbin bad, causes the unwinding difficulty, influences product quality.Therefore, must adopt the overfeeding mode during coiling, overfeed ratio is between 2～5%.
According to the Tynex that above-mentioned preparation method makes, its fiber number is 33dtex/6f, and line density is 33dtex/6f, and fracture strength is 3.2cN/dtex.
Claims (2)
1. the preparation method of a low melting point hot melt Tynex is characterized in that comprising the steps:
A), nylon chips is dry; Adopt the vacuum drum mode dry, its baking temperature is 50～70 degrees centigrade, and be 12～20 hours drying time;
B), spinning; Said spinning adopts spinning screw to carry out; And its temperature subregion control; Said temperature subregion is screw rod district, measuring pump district, bend pipe district and manifold tagma; Wherein the temperature in the screw rod district is 180～225 degrees centigrade, and the temperature in spinning manifold is 200～235 degrees centigrade, and spinning speed is 500～800 meters of per minutes; And when spinning, to add weight ratio concentration be 20% spinning oil;
C), stretch; During stretching, the temperature of heat dish is 45～55 degrees centigrade, and the setting temperature of hot plate is 55～65 degree; Stretching ratio is between 3.2～3.6.
2. the preparation method of low melting point hot melt Tynex according to claim 1 is characterized in that reeling after the stretching in the said step c), adopts the overfeeding mode during coiling, and overfeed ratio is between 2～5%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313721A (en) * | 2014-11-06 | 2015-01-28 | 湖北省宇涛特种纤维股份有限公司 | Low-melting-point heat-bonded polyamide fiber filament, and preparation method therefor |
| CN108560067A (en) * | 2018-05-03 | 2018-09-21 | 常熟涤纶有限公司 | A kind of preparation process of low melting point nylon fibre |
| CN110230134A (en) * | 2019-05-29 | 2019-09-13 | 义乌市润朵服装有限公司 | A kind of drafting system of weaving loom |
| CN114108122A (en) * | 2021-10-18 | 2022-03-01 | 浙江古纤道股份有限公司 | Preparation method of low-melting-point nylon fiber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104313721A (en) * | 2014-11-06 | 2015-01-28 | 湖北省宇涛特种纤维股份有限公司 | Low-melting-point heat-bonded polyamide fiber filament, and preparation method therefor |
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| CN108560067A (en) * | 2018-05-03 | 2018-09-21 | 常熟涤纶有限公司 | A kind of preparation process of low melting point nylon fibre |
| WO2019210650A1 (en) * | 2018-05-03 | 2019-11-07 | 常熟涤纶有限公司 | Preparation technique for low-melting-point polyamide fiber |
| CN110230134A (en) * | 2019-05-29 | 2019-09-13 | 义乌市润朵服装有限公司 | A kind of drafting system of weaving loom |
| CN114108122A (en) * | 2021-10-18 | 2022-03-01 | 浙江古纤道股份有限公司 | Preparation method of low-melting-point nylon fiber |
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Application publication date: 20120711 |