CN101144195A - Technique for producing ultra high-strength terylene industry filament yarn - Google Patents
Technique for producing ultra high-strength terylene industry filament yarn Download PDFInfo
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- CN101144195A CN101144195A CNA200710134080XA CN200710134080A CN101144195A CN 101144195 A CN101144195 A CN 101144195A CN A200710134080X A CNA200710134080X A CN A200710134080XA CN 200710134080 A CN200710134080 A CN 200710134080A CN 101144195 A CN101144195 A CN 101144195A
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Abstract
The present invention discloses a production process for an ultra high tenacity polyester industrial filament. The production process adopts a one-step method of spinning and stretching, and the method comprises the solid state tackifying, the melt spinning, the high temperature stretching, the heat setting, and the winding forming. The present invention adopts the innovative five-pair hot roll stretching heat setting process, compared with the traditional four-pair hot roll stretching heat setting, the the present invention adopts two-stage heat stretching, the processing method of the two-stage heat setting effectively reduces the stretching speed of fiber, and prolongs the heat setting time of the fiber, so that the fiber has an even stable orientation structure while the physical performance of products is ensured, the spinning condition is optimized. The ultra high tenacity polyester industrial filament prepared by utilizing the method of the present invention has the advantages that the intensity is high, the stretching and the dry heat shrinkage are reasonable, the heat resistant performance is good, and the impact resistant performance and the fatigue resistant performance are good.
Description
Technical field
The invention discloses a kind of production technology of ultra high-strength terylene industry filament yarn, belong to the textile technology technical field.
Background technology
Terylene is since coming out the fifties in last century, and the exploitation on industrial use has obtained very big progress.The strong industrial filament of terylene superelevation is widely used in to weave hanging belt, cotton rope, drag-line etc. because of it has the extra high characteristics of intensity.
At present, domestic production be generally common high-strength polyester industrial long filament, its quality is as follows: fracture strength is 7.8～8.0cN/dtex, dry-hot shrinkage is 8～13%, 5% load at certain elongation＜4cN/dtex.Common high strength yarn can only be used for making the general industrial product, and compares with high performance product, and manufacturing can lift the product of same load, needs to use the precursor of more radicals, also is non-remunerative economically concerning downstream user.In recent years, because the high-strength polyester industrial long filament is had higher requirement again for its intensity in the extensive use in fields such as military equipment, therefore developing a kind of more high-intensity polyester industrial filament yarn seems very urgent.
We think, so man of domestic industry Silk Mill does not only produce the polyester industrial yarn product that intensity 〉=8.3cN/dtex and degree of stretching and dry-hot shrinkage all conform with requirement, traced it to its cause following some:
1, not enough to the research of solid-phase tack producing (SSP) technology, the importance of its relevant parameter is not caused enough attention
2, spinning speed is not enough, only is 2000～2200m/min
3, draw roll temperature and each stage drafting multiple selection are improper; Selection to final drafting multiple on the technology is lower, is generally 4.0～5.2
4, non-selected rational loose ratio during drawing-off
Summary of the invention
The objective of the invention is to adopt the preparation technology of the ultra high-strength terylene industry filament yarn of a kind of spinning, stretching one-step method, have fracture strength height, extension at break and the rational characteristics of dry-hot shrinkage index with the polyester industrial filament yarn of this prepared.
For achieving the above object, the technical solution used in the present invention is: a kind of preparation technology of ultra high-strength terylene industry filament yarn, adopt spinning and stretching one-step method technology, and comprising:
1, solid-phase tack producing: common polyethylene terephthalate (PET) section in polymer reactor through solid phase become can the manufacture silk the high sticking section of technical grade; The present invention preferably adopts and finish whole polycondensation process in the ridge type polymer reactor; like this in whole polycondensation process; section is flowed in preheater with the form of laminar flow fully; so uniformity of time of staying that can guarantee all sections in preheater; there is not mechanical agitation in the whole process flow; solid-phase tack producing is carried out in section under the environment of a gentleness; in the tackify process, can not produce extra dust like this; the degree of purity and the viscosity uniformity of high sticking section have been guaranteed; adopt the mass flow technique of low pressure low speed to the conveying of spinning feed bin by SSP; whole induction system all uses pure nitrogen as working media; avoid producing dust, the screw rod inlet can not degraded owing to nitrogen protection yet.
2, melt spinning: high sticking section, through slow cooling, oils behind the lateral blowing cooling forming after the spinneret orifice ejection through the screw extruder melt extruded.
3, drawing by high temperature, HEAT SETTING: adopt 5 roller draft process, two-stage stretches, two levels of thermal is lax, and 125～135 ℃ of first step draft temperatures, draw ratio are 3.8～4.2,235～245 ℃ of the second step draft temperatures, draw ratio is 1.42～1.45, and total drawing ratio is 5.7～6.0,245～250 ℃ of first step heat setting temperatures, lax than 4.4%～4.6%, 240～250 ℃ of the second step heat setting temperatures, lax than 7.4～7.6%, the total relaxation ratio is 11%～12%; The corresponding relation that different lax ratios and two-stage are lax and the performance comparison table of product:
| Total loose % that compares | The loose % of one-level | The loose % of secondary | Winding tension cN | Fracture strength cN/dtex | Dry-hot shrinkage % | The spinning situation |
| 6 | 2 | 4 | 1.00 | 7.6 | 8.0 | Well |
| 8 | 5 | 3 | 0.75 | 7.8 | 12.0 | Difference |
| 10 | 4 | 6 | 0.60 | 8.0 | 10.0 | Relatively poor |
| 12 | 4 | 8 | 0.45 | 8.3 | 6.0 | Well |
As can be seen from the above table, total lax ratio, winding tension become linear approximate relationship with fracture strength, total relaxation is bigger than more, winding tension is more little, and the fracture strength of product is high more, but on the lax corresponding relation of two-stage, if one-level is lax excessive, it is always undesirable to spin condition, and it is apparent in view to beat on the in the end a pair of hot-rolling of strand, is easy to generate broken end.Because in relaxation, because strand tension force is between three pair rollers of back, reduce gradually, several to hot-rolling on the tension force transport phenomenon apparent in view, one-level is lax excessive, causes in the secondary relaxation, the Tension Difference mutation is big in the strand, slippage relatively between the different tow on the hot-rolling is easy to generate and jumps silk, causes broken end.Adopting the lax advantage of two-stage is the time that can prolong relaxation heat setting, make the crystalline texture of the unstable orientation texture disorientation formation large-size in the fiber, but the proportioning that two-stage is lax must be rationally, to reduce the transmission of tow tension on hot-rolling as far as possible, the relative slippage of control tow on hot-rolling, so winding tension and 1,2 grades lax than reasonably combined, could guarantee stable spinning situation, preferable is: 245～248 ℃ of first step heat setting temperatures, lax than 4.4%～4.6%, 240～245 ℃ of the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 11.9%～12.1%; The best is: 245 ℃ of first step heat setting temperatures, lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 12%.
4, coiling and molding: with above-mentioned fiber with 3000～4000 meters/minute the speed coiling and molding after obtain finished product.
Beneficial effect of the present invention is:
1, industrial silk spinning silk needs high sticking section, the section of traditional polymerization technique production can't be satisfied the requirement of industrial silk spinning silk, therefore necessary further tackify, we adopt the one-step method solid phase polycondensation process of innovation, are the ridge type structure in the polymer reactor, and section is passed through reactor with the form of laminar flow, heat by highly purified nitrogen, and take away the small-molecule substance that reaction generates, a step is finished tackify, and the viscosity of section is risen to about 1.02 by 0.65.The relay that one-step technology has been avoided cutting into slices in traditional solid phase polycondensation process is carried, prevent the back mixing of in a plurality of stills, cutting into slices, guarantee the viscosity uniformity of the high sticking section of raw material, viscosity fluctuation is controlled in the scholar 0.015, and the dust content in the control solid phase polycondensation process is below 50PPM.And the viscosity fluctuation of traditional handicraft solid phase polycondensation generally can only control to scholar 0.025, and dust content reaches more than the 100PPM.The raw material accurate viscosity Control of cutting into slices, extremely low dust content has guaranteed still can keep stable under the relatively harsher process conditions of spinning silk winding, for the technology adjustment in road, back provides bigger space.
2, our company's ultra high-strength terylene industry silk adopts 5 pairs of hot-rolling stretching heat setting process of innovation, compare with 4 pairs of traditional hot-rolling stretching HEAT SETTING, adopt 2 grades of hot-stretchs, the processing method of 2 grades of HEAT SETTING, effectively reduce the draw speed of fiber, prolonged the heat-setting time of fiber, make fiber have uniform and stable orientation texture, when guaranteeing the product physical property, optimized the situation of spinning.And because hot-rolling adopts the heating of multi-region high-frequency electrical mode of heating, hot-rolling surface temperature stable homogeneous makes the technical process control stabilization, and the dry-hot shrinkage fluctuation range of fiber has been dwindled one times than traditional handicraft.
3, utilize the ultra high-strength terylene industry filament yarn of the inventive method preparation to have the good advantage of reasonable, the shock-resistant fatigue performance of fracture strength height, extension at break and dry-hot shrinkage, can satisfy the needs of downstream user well.
The specific embodiment
Embodiment one:
1, common poly terephthalic acid second two fat (PET) sections through solid phase become can the manufacture silk the high sticking section of technical grade: low viscosity PET section quantitatively feeds crystallizer through revolving valve, under 180 ℃ of recirculated hot air effects, crystallize to degree of crystallinity 30%, revolving valve through the band gas locking device is fed into the ridge type reactor then, in 230 ℃ nitrogen environment, carry out solid phase polycondensation, by regulating the time of staying and nitrogen gas purity, the low sticking section of relative viscosity 0.67 is stated to the sticking section of height of relative viscosity 1.05.When high sticking section is cooled to 120 ℃, use the nitrogen induction system that the sticking section of height is transported to the screw extruder feed bin.
2, through the screw extruder melt extruded, after the spinneret orifice ejection, through slow cooling, lateral blowing cooling forming: melt extrude in the process, 300 ℃ of the melt temperatures of control screw rod outlet, through the annealing device of 330 ℃ of too high 300mm, temperature, the lateral blowing system delay cooling by 20 ℃ of temperature, relative humidity 80% again.In this process, control is extruded fast 10m/min, spinneret draft than about 65.
3, through oil, stretching, HEAT SETTING, coiling operation, obtain having superhigh intensity, the finished product polyester industrial yarn of low-shrinkage.After oiling, tow goes on foot HEAT SETTING: 130 ℃ of first step draft temperatures, 240 ℃ of 4.0, the second step of draw ratio draft temperatures, draw ratio 1.45 through two steps stretching, two; 245 ℃ of first step heat setting temperatures are lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%; Total stretching ratio 5.8, total relaxation is than 12%.
Embodiment two, preparation method and equipment are with embodiment one, and different is in the step 3, and 245 ℃ of first step heat setting temperatures are lax more lax than 7.6% than 240 ℃ of 4.4%, the second step heat setting temperatures; Total relaxation is than about 12%.
Claims (7)
1. the production technology of a ultra high-strength terylene industry filament yarn adopts spinning and stretching one-step method, comprising:
1) the low sticking section of solid-phase tack producing: PET in polymer reactor through solid phase become can the manufacture silk the sticking section of height;
2) melt spinning: high sticking section, through slow cooling, oils behind the lateral blowing cooling forming after the spinneret orifice ejection through the screw extruder melt extruded;
3) drawing by high temperature, HEAT SETTING: adopt 5 roller draft process, two-stage stretches, two levels of thermal is lax, and 125～135 ℃ of first step draft temperatures, draw ratio are 3.8～4.2,235～245 ℃ of the second step draft temperatures, draw ratio is 1.42～1.45, and total drawing ratio is 5.7～6.0,245～250 ℃ of first step heat setting temperatures, lax than 4.4%～4.6%, 240～250 ℃ of the second step heat setting temperatures, lax than 7.4～7.6%, the total relaxation ratio is 11%～12%;
4) coiling and molding: with above-mentioned fiber with 3000～4000 meters/minute the speed coiling and molding after obtain finished product.
2. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 1, it is characterized in that: 245～248 ℃ of first step heat setting temperatures are lax than 240～245 ℃ of 4.4%～4.6%, the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 11.9%～12.1%; The best is: 245 ℃ of first step heat setting temperatures, lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 12%.
3. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 2 is characterized in that: 245 ℃ of first step heat setting temperatures, 240 ℃ of lax 4.4%, the second step of ratio heat setting temperatures, lax ratio 7.6%; Total relaxation is than about 12%.
4. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 2: 130 ℃ of first step draft temperatures, 240 ℃ of 4.0, the second step of draw ratio draft temperatures, draw ratio 1.45; 245 ℃ of first step heat setting temperatures are lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%; Total stretching ratio 5.8, total relaxation is than 12%.
5. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 1, it is characterized in that: described polymer reactor is the ridge type polymer reactor.
6. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 1: spinning silk winding speed is 3000～4000 meters/minute.
7. the production technology of a kind of ultra high-strength terylene industry filament yarn according to claim 1, its product feature is: a kind of polyester industrial filament yarn (FDY) of intensity 〉=8.3cN/dtex, elongation 6～10%, dry-hot shrinkage≤8%.
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| CNA200710134080XA CN101144195A (en) | 2007-10-18 | 2007-10-18 | Technique for producing ultra high-strength terylene industry filament yarn |
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