CN103849948A - Producing method of dacron industrial filaments for melt direct spinning safety airbag - Google Patents
Producing method of dacron industrial filaments for melt direct spinning safety airbag Download PDFInfo
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- CN103849948A CN103849948A CN201410083563.1A CN201410083563A CN103849948A CN 103849948 A CN103849948 A CN 103849948A CN 201410083563 A CN201410083563 A CN 201410083563A CN 103849948 A CN103849948 A CN 103849948A
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Abstract
The invention discloses a producing method of dacron industrial filaments for a melt direct spinning safety airbag. The method is characterized by comprising the following steps including (1) melt viscosity increase: low-viscosity melt obtained through polycondensation is subjected to melt liquid phase viscosity increase polymerization; (2) melt direct spinning; high-intensity polyester melt is conveyed to each spinning positions and enters a spinning box body, the melt is extruded out from a spinneret plate after being metered and filtered, is heated by a slow-cooling heater, enters a spinning path after lateral blowing cooling, and is subjected to bundling oiling; (3) traction thermal formation: two-stage stretching is carried out, and in addition, loosening thermal formation is carried out; (4) winding forming: fiber treated through the step (3) is coiled and formed after the network processing, and products are obtained.
Description
Technical field
The present invention relates to fiber product manufacturing technology field, be specifically related to the production method of a kind of fused mass directly spinning air bag polyester industrial filament yarn.
Background technology
Safe automobile air bag industrial filament, traditional safe automobile air bag is produced and is adopted section spinning process flow process with industrial filament: undertaken after esterification, polycondensation reaction by PTA and EG, cooling and dicing is made the section of IV0.65-0.68dL/g, again by the sticky section of height of solid phase polycondensation IV0.92-1.10dl/g processed, by the spinning of screw rod melt extruded, batch and make through drawing and heat-setting.Tradition solid phase polycondensation process route is manufactured safe automobile air bag and is had with industrial filament that technological process is long, equipment investment is large, the high deficiency of energy consumption.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method of melt direct spinning High-speed machining polyester industrial filament is provided, realizes the object of industrial filament for the production fused mass directly spinning air bag of low energy consumption, high finished product rate.
For achieving the above object, the technical scheme that the present invention takes is as follows:
The production method of polyester industrial filament yarn for fused mass directly spinning air bag, comprises the steps:
(1) melt tackify: low polycondensation gained sticky melt is carried out to the polymerization of melt liquid-phase tackifying;
(2) melt direct spinning: high viscosity polyester melt Conveying to each spinning station, enters spinning manifold, melt is extruded by spinnerets through metering, after filtering, heated by slow cooling heater, then after lateral blowing is cooling, enter spinning shaft, boundling oils;
(3) drawing and heat-setting: carry out two-stage stretching, and relaxation heat setting;
(4) coiling and molding: after network processes, coiling and molding, makes product through the fiber of step (3).
In step (1), described liquid-phase tackifying is that the low sticky melt that viscosity that polycondensation is obtained is 0.65-0.71dl/g carries out tackify in the film formation reaction of vertical liquid-phase tackifying still; Reaction temperature is 275 ~ 285 ℃, and the reaction time is 90 ~ 110 minutes, and the melt viscosity that tackify obtains is 0.95 ~ 1.05dl/g, and b value is less than 3.
In step (2), spinning adopts 8/spinning, and after the pump of measuring pump, pressure is 12 ~ 18MPa, and filtering accuracy is 15 ~ 25 μ m, and the diameter of spinnerets is 165mm, and spinning temperature is 295 ~ 305 ℃.
In step (2), slow cooling adds thermal recovery slow cooling heater, and slow cooling heater height is 330mm, and slow heating-up temperature is 320-350 ℃.
In step (2), in cross air blowing device, lateral blowing temperature is 20 ~ 25 ℃, and humidity is 75 ~ 80%, and wind speed is: 0.50-0.65m/s.
In described cross air blowing device, be provided with fairing.
In step (2), spinning shaft is taper.
In step (2), spinning shaft below arranges oil nozzle, oils and adopts two road oil nozzles to oil, and oil applying rate is 0.7% ± 0.2.
In step (3), two-stage stretches and comprises that one-level stretches and two-stage stretches, and one-level draw ratio is 4.0-4.2, and secondary drawing is than being 1.40-1.42, and the temperature of drawing process is 92 ~ 245 ℃, and total drawing ratio is 5.95-6.15.
In step (3), the temperature of relaxation heat setting is 240-250 ℃, and total relaxation compares 7%-9%.
Operation principle and the beneficial effect of technical solution of the present invention are as follows:
Technological process of the present invention: undertaken after esterification, polycondensation reaction by PTA and EG, the melt Conveying of IV0.65-0.68dL/g is arrived to liquid-phase tackifying still, by the sticky melt of height of film forming liquid polycondensation IV0.95-1.10dl/g processed, be delivered to spinning by booster pump again, batch and make through drawing and heat-setting.The breakthrough of liquid-phase tackifying technology, (once washing still operation affects the spinning time and was decremented to 8 hours by 24 hours, in periodic duty three months efficiently to wash the maturation of still flow process.) widely shortened process, reduce equipment investment, reduce energy consumption.
The present invention has adopted vertical viscosity-increasing reactor, melt enters and distributes from top, there is gravity nature film forming to flow down, advance without power, the little molecular product that polycondensation produces is removed by vacuum suction, melt first in first out, has guaranteed that high sticky melt has consistent reaction condition and the time of staying in reactor.The polymeric reaction temperature in liquid-phase tackifying stage is controlled at 275 ~ 285 ℃, and the reaction time is controlled at 90 ~ 110min.Adopt above-mentioned process conditions, can suppress the generation of side reaction in high temperature tackify course of reaction, guarantee that melt form and aspect are good, meanwhile, also can effectively improve melt viscosity, Reaction time shorten, maintain large capacity long-term operation, the high sticky melt of output high-quality polyester, more than the melt viscosity after tackify can reach 0.95-1.1dl/g, melt b value is less than 3, can meet the demand of terylene industrial yarn spinning.
The present invention compared with prior art has the following advantages:
1, take high-viscosity polyester melt as raw material, melt direct spinning air bag polyester industry yarn processed, the spinning fiber number of single head can reach for 500 dawn, the large 7.5cN/dtex of fracture strength of fiber, with existing air bag with compared with polyester industrial filament yarn production process, under the prerequisite being protected at melt and fiber quality, to shorten the reaction time, effectively shorten technological process, raised the efficiency, reduced energy consumption.
2, cross air blowing device adopts sandwich construction, comprises rectification layer, filter course.Guarantee to have guaranteed that wind speed profile is even.
3, spinning shaft is related to taper tube wall and the spinning shaft by loose structure, makes inside and outside air balance, and is easy to exchange the heat of strand.
4, owing to being melt direct spinning, be not subject to the flow restriction of spinning screw spinning, thereby in technical solution of the present invention, spinning machine adopts 8/.The air bag polyester industrial filament that this method is produced, constant product quality, production efficiency is high, has improved the output of unit interval, has reduced and has produced power consumption and production cost.
Adopt the prepared product of technical solution of the present invention to can be used as silk for automotive safety, as safe automobile air bag.
specific embodiments
Embodiment 1
Technological parameter is as follows:
Equipment: LSP liquid phase polymerization equipment; Spinning equipment; Stretching and winding equipment.
Product specification: 550tex/140f.
Raw material: viscosity 0.98dl/g after glossy polyester melt tackify; End carboxyl-COOH≤30mol/t; Diethylene glycol (DEG)≤1.2%.
Liquid phase polymerization temperature: 278-285 ℃.
Spinning temperature: 302 ℃.
Slow cooling heating-up temperature: 330 ℃.
Measuring pump is for amount: 342g/min.
Lateral blowing cooling parameter:
Wind speed: 0.60m/s; Humidity: 75%; Wind-warm syndrome: 21 ℃.
Stretching condition (two-stage stretching)
one-level draw ratio: 4.06,
Total draw ratio: 6.15,
| Draw roll | Speed m/min | Temperature ℃ |
| GR1 | 461 | ? |
| GR2 | 476? | 92 |
| GR3 | 1920 | 125 |
| GR4 | ? 2835? | ?244 |
| GR5 | ?2680 | ? 244 |
| GR6 | 2575 | ?235 ? |
Relaxation rate: 8.29%,
Winding speed: 2600m/min.
Spinning oil: Japan produces, this E-6551 of pine, crude oil oils.
Network device pressure: pre-network 0.15MPa, master network 0.30MPa.
Concrete technology step:
Processing high-viscosity polyester melt: first base polyester melt (low sticky melt) is transported to liquid phase polymerizer tackify once again by pipeline; reaction temperature is 278 ℃; reaction time is 90 minutes; under the protection of high vacuum, melt improves viscosity by film apparatus, and the ethylene glycol that reaction produces and other side reaction things are by vacuum sucking-off.Melt viscosity is brought up to 0.98dl/g from 0.665dl/g;
Direct fabrics: the polyester fondant after liquid-phase tackifying polymerization is delivered to spinning manifold by melt house steward, after entering filament spinning component, extrudes from spinnerets measuring pump again, the diameter of spinnerets is 165mm, heated by slow cooling heater, slow cooling heating-up temperature is 330 ℃, highly 330mm, again by side shape blowing device cooling forming, blowing temperature is at 21 ℃, humidity is 75%, and wind speed 0.60m/s is provided with rectification and filtering material in cross air blowing device, rectifying material just has monoblock cellular board, and filtering material adopts metal mesh filter.Then enter spinning shaft, spinning shaft is designed to taper, is designed with porous, the inside and outside air-flow of balance.
Stretching and winding: at 8/, single head fiber number is 560dtex, 2600 ms/min of spinning speeds; Oil on silk surface, adopt two-stage high-speed stretch, under 92 ~ 244 ℃ of conditions of heating-up temperature, stretch, total draw ratio is 6.15; Be, under the condition of 244-247 ℃, to carry out high temperature, relaxation heat setting in temperature; And in the scope of 2600 ms/min of process speeds coiling and molding, make finished product.
The air bag industrial filament that the present embodiment is produced, line density is 560dtex, fracture strength is greater than 7.6cN/dtex, the coefficient of variation is less than 4.5%, elongation at break 17 ± 2%, dry-hot shrinkage 3.5% ± 0.5(190 ℃ × 5minwith0.01cn/dtex), network 13 ± 2/M.
Embodiment 2
Technological parameter is as follows:
Equipment: LSP liquid phase polymerization equipment; Spinning equipment; Stretching and winding equipment.
Product specification: 470dtex/140f
Raw material: viscosity 0.98dl/g after glossy polyester melt tackify; End carboxyl-COOH≤30mol/t; Diethylene glycol (DEG)≤1.2%.
Liquid phase polymerization temperature: 278-285 ℃.
Spinning temperature: 300 ℃.
Slow cooling heating-up temperature: 330 ℃.
Pump is for amount: 287g/min
Lateral blowing cooling parameter:
Wind speed: 0.55m/s; Humidity: 75%; Wind-warm syndrome: 21 ℃.
Stretching condition (two-stage stretching)
one-level draw ratio: 4.02,
Total draw ratio: 6.06,
| Draw roll | Speed m/min | Temperature ℃ |
| GR1 | ?465 | ? |
| GR2 | 480 | 92 |
| GR3 | 1960? | 125 |
| GR4 | ?2820 | 246 |
| GR5 | ?2680? | ?245 |
| GR6 | 2575 | ?235 ? |
Relaxation rate: 7.80%.
Winding speed: 2600m/min.
Spinning oil: Japan produces, this E-6551 of pine, crude oil oils.
Network device pressure: first network 0.15MPa, second network 0.3MPa.
Concrete technology step:
1) processing high-viscosity polyester melt: first base polyester melt is transported to liquid phase polymerizer tackify once again by pipeline, reaction temperature is 278 ℃, reaction time is 90 minutes, under the protection of high vacuum, melt improves viscosity by film apparatus, the ethylene glycol that reaction produces and other side reaction things are by vacuum sucking-off, and melt viscosity is brought up to 0.98dl/g from 0.665dl/g;
2) direct fabrics: the polyester fondant after liquid-phase tackifying polymerization is delivered to spinning manifold by melt house steward, after entering filament spinning component, extrudes from spinnerets measuring pump again, the diameter of spinnerets is 165mm, heated by slow cooling heater, slow cooling heating-up temperature is 330 ℃, highly 330mm, again by cross air blowing device cooling forming, blowing temperature is at 21 ℃, humidity is 75%, and wind speed: 0.55m/s is provided with rectification and filtering material in cross air blowing device, rectifying material just has monoblock cellular board, and filtering material adopts metal mesh filter.Then enter spinning shaft, spinning shaft is designed to taper, is designed with porous, the inside and outside air-flow of balance.
3) stretching and winding: at 8/, single head fiber number is 470dtex, 2600 ms/min of spinning speeds; Oil on silk surface, carry out the two-stage high-speed stretch in above-mentioned technological parameter, under 92 ~ 246 ℃ of conditions of heating-up temperature, stretch, total draw ratio is 6.06; Be, under the condition of 245 ~ 2248 ℃, to carry out high temperature, relaxation heat setting in temperature; And in the scope of 2600 ms/min of process speeds coiling and molding, make finished product.
The air bag polyester industrial filament that the present embodiment is produced, line density is 470dtex, fracture strength is greater than 7.6cN/dtex, the coefficient of variation is less than 4.5%, elongation at break 18 ± 2%, dry-hot shrinkage 3.5% ± 0.5(190 ℃ × 5minwith0.01cn/dtex, network 13 ± 2/M.
Claims (10)
1. the production method of polyester industrial filament yarn for fused mass directly spinning air bag, is characterized in that, comprises the steps:
(1) melt tackify: low polycondensation gained sticky melt is carried out to the polymerization of melt liquid-phase tackifying;
(2) melt direct spinning: high viscosity polyester melt Conveying to each spinning station, enters spinning manifold, melt is extruded by spinnerets through metering, after filtering, heated by slow cooling heater, then after lateral blowing is cooling, enter spinning shaft, boundling oils;
(3) drawing and heat-setting: carry out two-stage stretching, and relaxation heat setting;
(4) coiling and molding: after network processes, coiling and molding, makes product through the fiber of step (3).
2. the production method of fused mass directly spinning air bag polyester industrial filament yarn according to claim 1, it is characterized in that: in step (1), described liquid-phase tackifying is that the low sticky melt that viscosity that polycondensation is obtained is 0.65-0.71dl/g carries out tackify in the film formation reaction of vertical liquid-phase tackifying still; Reaction temperature is 275 ~ 285 ℃, and the reaction time is 90 ~ 110 minutes, and the melt viscosity that tackify obtains is 0.95 ~ 1.05dl/g, and b value is less than 3.
3. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, it is characterized in that: in step (2), spinning adopts 8/spinning, after the pump of measuring pump, pressure is 12 ~ 18MPa, filtering accuracy is 15 ~ 25 μ m, the diameter of spinnerets is 165mm, and spinning temperature is 295 ~ 305 ℃.
4. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, is characterized in that: in step (2), slow cooling adds thermal recovery slow cooling heater, and slow cooling heater height is 330mm, and slow heating-up temperature is 320-350 ℃.
5. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, is characterized in that: in step (2), in cross air blowing device, lateral blowing temperature is 20 ~ 25 ℃, and humidity is 75 ~ 80%, and wind speed is: 0.50-0.65m/s.
6. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1 or 5, is characterized in that: in described cross air blowing device, be provided with fairing.
7. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, is characterized in that: in step (2), spinning shaft is taper.
8. the production method with polyester industrial filament yarn according to the fused mass directly spinning air bag described in claim 1 or 7, is characterized in that: in step (2), spinning shaft below arranges oil nozzle, oils and adopts two road oil nozzles to oil, and oil applying rate is 0.7% ± 0.2.
9. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, it is characterized in that: in step (3), two-stage stretches and comprises that one-level stretches and two-stage stretches, one-level draw ratio is 4.0-4.2, secondary drawing is than being 1.40-1.42, the temperature of drawing process is 92 ~ 245 ℃, and total drawing ratio is 5.95-6.15.
10. the production method of polyester industrial filament yarn for fused mass directly spinning air bag according to claim 1, is characterized in that: in step (3), the temperature of relaxation heat setting is 240-250 ℃, and total relaxation compares 7%-9%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104451918A (en) * | 2014-12-11 | 2015-03-25 | 浙江尤夫高新纤维股份有限公司 | Production method of melt direct spinning flat polyester industrial filaments |
| CN105369377A (en) * | 2015-12-04 | 2016-03-02 | 浙江古纤道新材料股份有限公司 | High-strength type HMLS terylene industrial yarn processing equipment |
| CN111793839A (en) * | 2020-06-30 | 2020-10-20 | 浙江海利环保科技股份有限公司 | Method for delaying filament bundle cooling spinning of multi-F fine denier regenerated polyester filament |
| CN114921863A (en) * | 2022-02-25 | 2022-08-19 | 桐昆集团浙江恒通化纤有限公司 | Production method of water-repellent oil-repellent air filtration fiber |
| CN115382297A (en) * | 2022-04-12 | 2022-11-25 | 江阴市华思诚无纺布有限公司 | Melt direct spinning triangular-section sheath-core bi-component PET (polyethylene terephthalate) spun-bonded liquid filter material and preparation method thereof |
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| CN115382297A (en) * | 2022-04-12 | 2022-11-25 | 江阴市华思诚无纺布有限公司 | Melt direct spinning triangular-section sheath-core bi-component PET (polyethylene terephthalate) spun-bonded liquid filter material and preparation method thereof |
| CN115382297B (en) * | 2022-04-12 | 2023-10-31 | 江阴市华思诚无纺布有限公司 | Melt direct spinning bi-component PET (polyethylene terephthalate) spinning liquid filtering material and preparation method thereof |
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Application publication date: 20140611 |