A kind of manufacture method of antithermal shrink polyster high strength yarn
Technical field
The present invention relates to a kind of manufacture method of industrial terylene thread, especially a kind of manufacture method of antithermal shrink polyster high strength yarn.
Background technology
Antithermal shrink polyster high strength yarn has characteristics such as intensity height, ABRASION RESISTANCE be good, corrosion-resistant, is a special kinds of polyester industrial yarn.Since 20th century, introduced polyester industrial yarn production equipment and technology the nineties, the output of common high strength yarn is all increasing every year, development along with industry, market also increases day by day to the demand of antithermal shrink polyster high strength yarn, Application Areas is constantly expansion also, as industries such as building, daily living article, medical science, military supplies application is arranged all, specific to lamp house cloth, filtration fabrics, the high temperature resistant fabric of building, WATERPROOF FABRIC etc.
At present, mainly continue to use the production route of polyester industrial yarn both at home and abroad, adopt conventional spinning drawing-off two step method, can spin the middle high-strength terylene filament of fracture strength greater than 6.0cN/dtex, main processes comprises: inherent viscosity is carried out melt spinning greater than 0.85 polyester, during spinning, below shower nozzle, add annealing device, spinning speed is between 600-800m/min, and the silk that makes carries out the secondary drawing-off, regulates proper temperature and one-level, secondary drawing multiplying power proportioning, produce required in high-intensity terylene thread, its technical indicator: intensity is 6.2-6.4cN/dtex, dry-hot shrinkage 2.0-2.5%, elongation at break 12-15%.And at present real antithermal shrink polyster high strength yarn rule of origin mainly relies on import, perhaps produces by import equipment and technology, and its manufacture method and technology and domestic prior art and equipment difference are very big, and its manufacturing cost is also high.
Summary of the invention
According to problems of the prior art, promptly utilize homemade spinning equipment, improve the production technology of existing antithermal shrink polyster silk, the objective of the invention is to design the production method of a kind of stable and reliable operation, antithermal shrink polyster high strength yarn that cost of investment is low, technical scheme of the present invention is so to realize:
A kind of manufacture method of antithermal shrink polyster high strength yarn, comprise polyester slice raw material-solid phase polycondensation-melt extruded-lateral blowing cooling-multistage hot-rolling stretching-high temperature laxation shaping-coiling and molding, raw material adopts batch (-type) through solid phase polycondensation, i.e. rotary drum tackify under vacuum, acquired character viscosity is the sticking section of the height of 0.96-0.99, require to have a narrower molecular weight distribution simultaneously, make big molecule even as much as possible, reaction speed can not be too fast, and temperature can not be too high, and the material temperature is 226 ℃-232 ℃, strand is slowly increased, and vacuum and whipping performance are preferably arranged, allow micromolecule in time get rid of, make big molecule have more uncertainty to prevent backward reaction;
In " lateral blowing cooling " step, the speed of cooling air, temperature,, blast and aperture size, all cooling has very big influence to silk, and most important to the influence of spinning and after-drawing.Wind speed, blast are big, easily take away heat, but make the bar swing easily, and move on the freezing point, are unfavorable for spinning; Wind speed, blast are little, and cooling effect is bad, and freezing point moves down, difficulty in spinning; The wind-warm syndrome height can reduce the jet stretch tension force of fiber, reduces the preorientation of fiber, and the multistage hot-rolling that is beneficial to the back stretches, but has influenced crystallization, has reduced the heat endurance of fiber simultaneously.For taking into account intensity and heat-shrinkable, selecting wind-warm syndrome is 18 ℃-20 ℃, blast 500Pa, wind speed 0.6m/s; Described multistage hot-rolling stretches and divides two-stage, and the first order stretches 4 times, and second level stretching 1.4-1.5 times, the first order and second level heat roller temperature are 185 ℃-188 ℃; Described high temperature laxation shaping is chosen under 246 ℃ of-252 ℃ of high temperature actions, and by the overfeeding of big ratio, the partial relaxation bigger internal stress falls, and macromolecular conformation is tended towards stability.
" multistage hot-rolling stretching " is contract key in the high strength yarn production technology of heat resistanceheat resistant, common high strength yarn stretches, pass through multistage stretching at a certain temperature, polyester macromolecule chain and crystal grain, crystalline region are arranged vertically in order, obtain higher orientation, the intensity of fiber is improved step by step, temperature is controlled at about 230 ℃ of softening points, can be easy to reach 7.5cN/dtex intensity, but its heat endurance is bad, because higher draft temperature, it is very high to surpass 200 ℃ of macromolecular internal stress, occur disorientation after being heated easily, thereby be difficult to obtain the low thermal shrinkage fiber.The present invention continues to use two-stage and stretches, the first order stretches 4 times, second level stretching 1.4-1.5 doubly, two-stage stretches and all selects heat roller temperature is 185 ℃-190 ℃, at this moment nucleus is grown up rapidly, carries out in the time of when being stretching in nucleus and shooting up, and being orientated like this is not only single macromolecular chain, and also have crystal grain, crystalline region and the orientation of the macromolecular mass that is cross-linked with each other, also lay a good foundation for road " high temperature laxation shaping " down.
" high temperature laxation shaping " is chosen under 246 ℃ of-252 ℃ of high temperature actions, and by the overfeeding of big ratio, the partial relaxation bigger internal stress falls, macromolecular conformation is tended towards stability, thereby reach fiber be heated the retraction little, i.e. the purpose that heat resistanceheat resistant is contracted, dry-hot shrinkage can reach 0.2%.
As preferably, melt extruded obtains as-spun fibre through slow cooling, in this process, polyester macromolecule is finished by solid-state-liquid state-solid-state conversion, and the fiber-forming polymer of rheid has stronger viscoplasticity, have higher jet stretch tension force, it is improper to cool off, and can cause sticking connection or melt fracture.In the large-scale production process; owing to be subjected to the influence of several factors; the nature drawing point is difficult to fixing; make the uncertainty that becomes very big that stretches,, help controlling preorientation and crystallization simultaneously for a metastable natural drawing point is arranged; there is a higher slow cooling temperature very necessary; through a large amount of experiments, the slow cooling temperature is controlled at 358 ℃-362 ℃, and 360 ℃ are scheme most preferably.
As preferably, use finish lubricated in the high temperature laxation shaping technology, used finish is high temperature resistant finish, each component is:
(a) PSI, its molecular formula is
Mass percent is 5~8%;
(b) Emulsifier EL-60 90, and its molecular formula is
Mass percent is 32~40%;
(c) nonyl phenol polyethenoxy ether, its molecular formula is
Mass percent is 30~34%;
(d) pentaerythrite alkyl three esters, its molecular formula is
Mass percent is 28~32%.
As preferably, the inherent viscosity of high sticking section is 0.98 in " solid phase polycondensation " step.
As preferably, the slow cooling temperature is 360C in " melt extruded " step.
The present invention utilizes the section of high and dry technology company far away in the Chinese Zhengzhou to carry and pre-crystallization apparatus, the solid-phase tack producing device of sky, Yangzhou great pressure company, in Beijing beautiful chemical fibre system machine company spin equipment such as owing combination machine, improve spinning technique, a kind of manufacture method of antithermal shrink polyster high strength yarn has been proposed, the main technique step is: polyester slice raw material-solid phase polycondensation-melt extruded-lateral blowing cooling-multistage hot-rolling stretching-high temperature laxation shaping-coiling and molding, having made intensity is 6.5-7.2cN/dtex, dry-hot shrinkage 0.2-1.0%, percentage elongation is the antithermal shrink polyster high strength yarn of 22-25%, this process cost of investment is low, implement simple, started on home equipment that to produce dimensional stability to heating in house little, the precedent of the terylene thread that intensity is high, market application foreground is wide.
The specific embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1: a kind of manufacture method of antithermal shrink polyster high strength yarn comprises " polyester slice raw material-solid phase polycondensation-melt extruded-lateral blowing cooling-multistage hot-rolling stretch a high temperature laxation shaping-coiling and molding " processing step.
The polyester slice raw material reaches the tackify purpose through solid phase polycondensation, and the present invention adopts rotary drum tackify under the vacuum, and acquired character viscosity is 0.98 the sticking section of height, and temperature can not be too high, and the material temperature is 228 ℃;
" melt extruded " step.The sticking section of height behind the solid phase polycondensation by the screw rod melt extruded, through the measuring pump accurate measurement with melt pressure is provided, sprays the melt thread by filament spinning component, and slow cooling becomes as-spun fibre, and the slow cooling temperature is controlled at 360 ℃ ± 1 ℃;
" lateral blowing cooling " step, for taking into account intensity and heat-shrinkable, selecting wind-warm syndrome is 19 ℃, blast 500Pa, wind speed 0.6m/s;
" multistage hot-rolling stretching " divides two-stage, and the first order stretches 4 times, and the second level stretches 1.45 times, and the first order and second level heat roller temperature are 186 ℃;
" high temperature laxation shaping " is chosen under 248 ℃ of high temperature actions, and by the overfeeding of big ratio, the partial relaxation bigger internal stress falls, macromolecular conformation is tended towards stability, thereby reach fiber be heated the retraction little, i.e. the purpose that heat resistanceheat resistant is contracted, dry-hot shrinkage can reach 0.2%; Added high temperature resistant finish in this processing step, its component is:
(a) PSI, its mass percent are 6%,
(b) Emulsifier EL-60 90, and its mass percent is 34%,
(c) nonyl phenol polyethenoxy ether, its mass percent are 32%,
(d) pentaerythrite alkyl three esters, its mass percent is 28%;
" coiling and molding ", the silk behind the high temperature laxation shaping is reeled by cold dish, and the silk of gained does not have broken end, lousiness, and technical indicator meets the requirement of antithermal shrink polyster high strength yarn.
Embodiment 2: a kind of manufacture method of antithermal shrink polyster high strength yarn comprises " polyester slice raw material-solid phase polycondensation-melt extruded-lateral blowing cooling-multistage hot-rolling stretching-high temperature laxation shaping-coiling and molding " processing step.
" lateral blowing cooling " step, for taking into account intensity and heat-shrinkable, selecting wind-warm syndrome is 18 ℃, blast 500Pa, wind speed 0.6m/s;
Other step reference example 1 is identical with embodiment 1.
Embodiment 3: a kind of manufacture method of antithermal shrink polyster high strength yarn comprises " polyester slice raw material-solid phase polycondensation-melt extruded-lateral blowing cooling-multistage hot-rolling stretch a high temperature laxation shaping-coiling and molding " processing step.
" multistage hot-rolling stretching " divides two-stage, and the first order stretches 4 times, and the second level stretches 1.5 times, and the first order and second level heat roller temperature are 188 ℃;
" high temperature laxation shaping " is chosen under 250 ℃ of high temperature actions, and by the overfeeding of big ratio, the partial relaxation bigger internal stress falls, macromolecular conformation is tended towards stability, thereby reach fiber be heated the retraction little, i.e. the purpose that heat resistanceheat resistant is contracted, dry-hot shrinkage can reach 0.2%.Added high temperature resistant finish in this processing step, its component is:
(a) PSI, its mass percent are 8%,
(b) Emulsifier EL-60 90, and its mass percent is 32%,
(c) nonyl phenol polyethenoxy ether, its mass percent are 30%,
(d) pentaerythrite alkyl three esters, its mass percent is 30%;
Other step reference example 1 is identical with embodiment 1.