EP2218807A1 - Heat treatment for increasing compressive strentgh of PPTA filaments - Google Patents
Heat treatment for increasing compressive strentgh of PPTA filaments Download PDFInfo
- Publication number
- EP2218807A1 EP2218807A1 EP09153014A EP09153014A EP2218807A1 EP 2218807 A1 EP2218807 A1 EP 2218807A1 EP 09153014 A EP09153014 A EP 09153014A EP 09153014 A EP09153014 A EP 09153014A EP 2218807 A1 EP2218807 A1 EP 2218807A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ppta
- yarn
- filaments
- heat treatment
- compressive strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 238000009987 spinning Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000004148 curcumin Substances 0.000 claims abstract description 4
- 230000007717 exclusion Effects 0.000 claims abstract description 4
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- 239000004760 aramid Substances 0.000 description 6
- 229920003235 aromatic polyamide Polymers 0.000 description 6
- 125000003118 aryl group Chemical group 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920003368 Kevlar® 29 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000000399 optical microscopy Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
- D01F6/605—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides from aromatic polyamides
Definitions
- the invention relates to a method for obtaining a PPTA [poly(para-phenylene terephthalamide)] yarn with increased compressive strength and to PPTA yarn thus obtained.
- Heating PPTA yarn is a common process to remove water that adheres to the yarn after neutralizations and washing during the spinning process. Such heating processes typically are performed at about 150 to 250 oC for typically not longer than a few seconds.
- Yarns spun from anisotropic solution of high molecular weight aromatic polyamides are known in literature.
- the process of making wholly aromatic polyamides is taught by Kwolek et al. in US 3,063,966 .
- the processing for spinning wholly aromatic polyamide yarns from anisotropic solutions is taught in US 3,154,610 and US 3,414,645 .
- the preparation of anisotropic dopes of aromatic polyamides is disclosed in US RE 30,352 .
- the present invention allows standard spin dope preparation and dry jet wet (air gap) spinning techniques that can be used without modifications of the aryl moieties as opposed to earlier described.
- Yarns were prepared from PPTA having a compressive strength as high as 1.3 GPa or even higher.
- the invention relates to a method for obtaining a PPTA yarn with increased compressive strength by the steps of air gap spinning a PPTA spin dope to PPTA filaments, bundling the filaments to the yarn, washing and optionally neutralizing and drying the yarn, characterized in that these steps are followed by applying a heat treatment to the PPTA yarn comprising heating the yarn at a temperature of 340 to 510 oC for 5 sec to 5 min under exclusion of oxygen.
- this method renders PPTA yarns having improved compressive strength by applying a heating process for a relatively long time at relatively low tensions.
- This heating step is in addition to the commonly used steps of making PPTA yarns, including air gap spinning, which includes coagulating the spun filaments and bundling these to yarn, followed by one or more of well-known process steps as washing, neutralizing, drying, winding and the like.
- the best compressive strength improvement is obtained when the heat treatment of the yarn is performed at a temperature of 360 to 480 oC for 20 sec to 2 min. It was found that the results improved at higher temperature at the lower end of the claimed time period, thus better results are obtained when the heat treatment is performed at a temperature of 410 to 440 oC for 20 sec to 1 min, or even better when performed at a temperature of 425 to 435 oC for 20 sec to 1 min. In general shorter heating times are used at higher heating temperatures.
- the heat treatment is performed at a tension of 0.02 to 3 cN/dtex, more preferably at a tension of 0.1 to 0.5 cN/dtex, and most preferably at a tension of 0.1 to 0.3 cN/dtex.
- the heating step of this invention is performed under exclusion of oxygen.
- the presence of oxygen during this treatment has a negative influence on the tenacity of the yarn.
- Oxygen therefore must be removed as good as possible from the heating device, such as an oven, for instance by flushing with inert gas such as nitrogen, helium, and the like.
- the amount of oxygen must be brought to less than 1 vol%, preferably less than 0.5 vol%.
- the PPTA yarns were spun from anisotropic solutions of aromatic polyamides in sulfuric acid, but other solvents such as NMP/calcium chloride can also be used.
- the aromatic polyamides were prepared using conventional polycondensation reaction techniques.
- the spin dopes could be prepared by mixing the polymer with sulfuric acid ice.
- the yarns can be spun via the known dry jet wet spinning procedure.
- the present method of the additional heat treatment may render PPTA yarns wherein the filaments have compressive strengths that have never been obtained earlier.
- the compressive strength of the filaments (of PPTA yarns) is higher than in the similar yarns not having undergone the additional heat treatment.
- the invention therefore has also to its objective PPTA yarns wherein the average compressive strength ⁇ c of its filaments is at least 0.8 + 2.5 * 10 -3 * (E-100) GPa, wherein E is the modulus in GPa.
- the term "average compressive strength" ( ⁇ c ) means the average of the measured compressive strength values of 3 filaments that are at randomly taken from the yarn.
- PPTA yarns with compressive strength 0.5 GPa at a modulus of 50 GPa have filaments with compressive strength 0.5 GPa at a modulus of 50 GPa, whereas this PPTA yarn after the heat treatment of this invention has a compressive strength of at least about 0.68 GPa.
- PPTA yarns with compressive strength 0.95 GPa or higher are yarns that have never been obtained earlier.
- PPTA yarns having filaments with compressive strengths of at least 0.95 GPa, more preferably of at least 1 GPa are therefore novel and also an objective of this invention. These yarns with extreme high compressive strength filaments are obtained by selecting optimum heating conditions with regard to temperature and heating time.
- the treatment was done in an oven of 3.66 m length.
- the oven was under nitrogen to a residual level of less than 0.3 vol% oxygen.
- Yarns were equilibrated at 21 °C and 65% RH.
- the compressive strength was determined via the elastica loop test (ELT) according to D.J. Sinclair, J. Appl. Phys., 21 (1950) 380 .
- ELT elastica loop test
- a filament is bent into a single asymmetric loop wherein the diameters are a few millimeters, immersed in paraffin, covered with a glass slide, which is then gradually contracted. Images were acquired during contraction, followed by measuring the c- and ⁇ -axes, wherein the c-axis is the largest diameter and the ⁇ -axis is the smallest diameter of the loop.
- the compressive strength ⁇ c is calculated from c*, which is determined by taking the intersection of two lines that can be drawn through the graph c/a before and after kink bend formation.
- the c* is obtained by semi-automatic drawing both lines.
- solid sulfuric acid having a concentration of 99.8% and high molecular weight PPTA were initially mixed at temperatures below 10 °C, Subsequently, the temperature of the polyamide sulfuric acid mixture was allowed to rise to room temperature resulting in a dry sandy mass, for use in making the spin dope.
- the PPTA and concentrated sulfuric acid can be mixed in a twinscrew extruder above room temperature to directly obtain the spin dope.
- PPTA spin dope was spun to filament yarn of different linear densities and finally washed and dried in the conventional manner.
- the yarn was heat treated in a tube oven at the temperatures and times as indicated in Table 1 in an inert environment (max. 0.25 vol.% O 2 ).
- the properties of these yarns are listed in Table 1.
- PPTA is poly(para-phenyleneterephthalamide);
- Comp. compression Table 1
- Mechanical properties of PPTA yarns after heat treatment Tension cN/dtex Heating time sec Temp °C Linear density dtex Tenacity mN/tex EAB % Modulus GPa Toughness J/g Comp.
Abstract
Description
- The invention relates to a method for obtaining a PPTA [poly(para-phenylene terephthalamide)] yarn with increased compressive strength and to PPTA yarn thus obtained.
- It is an objective of the present invention to provide PPTA yarns having filaments with improved compressive properties. It was found that this objective could be reached if the yarn receives an after treatment wherein the yarn is subjected to particular heating conditions.
- Heating PPTA yarn is a common process to remove water that adheres to the yarn after neutralizations and washing during the spinning process. Such heating processes typically are performed at about 150 to 250 ºC for typically not longer than a few seconds.
- Yarns spun from anisotropic solution of high molecular weight aromatic polyamides are known in literature. The process of making wholly aromatic polyamides is taught by Kwolek et al. in
US 3,063,966 . The processing for spinning wholly aromatic polyamide yarns from anisotropic solutions is taught inUS 3,154,610 andUS 3,414,645 . The preparation of anisotropic dopes of aromatic polyamides is disclosed inUS RE 30,352 . - Several attempts to improve compressive properties of polymeric yarns in general, and PPTA yarns in particular, are known. Sweeny reported the thermal elimination of halogens from the aryl moieties followed by the cross-linking of the halogen-free aryl moieties, in order to create inter-chain covalent bonding between the aryl moieties and increasing the compressive strength (Sweeny, W., Improvements in compressive properties of high modulus yarns by crosslinking. J. Polym. Sci., Part A: Polym. Chem., 1992, 30(6): p. 1111-1122).
- D.J. Sweeney at al. in High Perf. Polym., 14, 133-143 (2002) performed a heat treatment on unmodified PPTA yarn (Kevlar-29 fiber) to improve the compressive strength of the yarn. Yarns were slowly heated to 400, 440, or 470 ºC and held at that temperature for 5 to 10 minutes. The yarns were slowly brought to these temperatures by using a heating rate (ramp) of 2.5 to 7.5 ºC/min. Thus the minimum period that the yarns were kept between 340 and 400 ºC was 13 minutes, and the period between 360 and 400 ºC was at least 10 minutes. Thus the yarns were heated for relatively long periods and only moderate improvements were found at compressive strengths which were found to be from 0.31 to 0.63 GPa.
- Common heating conditions have been described in
US 3,869,430 . The yarns are heated within a zone maintained at a temperature of at least 150 ºC under a tension of at least 0.45 cN/dtex. The use of 150 ºC for a period of 60 seconds under a tension of 9 cN/dtex has been found satisfactory for a 171 dtex yam. Higher temperatures can be used, but using very short heating times. Thus the use of a 650 ºC zone has only given good results with a 360 dtex yam for periods of from 0.6 to 1.0 second at 5.5 cN/dtex. Extension of the time at this high temperature leads to higher modulus but also to a serious loss in tensile strength. Thus zone temperatures as high as 800 ºC or more could only be used at sufficiently short times and low tensions. The use of high temperatures and long times under these conditions leads to excessive degradation of the yarn resulting in losses of tensile strength and/or inherent viscosity. - Contrary to most of the prior art attempts wherein modified PPTA was used, the present invention allows standard spin dope preparation and dry jet wet (air gap) spinning techniques that can be used without modifications of the aryl moieties as opposed to earlier described. Yarns were prepared from PPTA having a compressive strength as high as 1.3 GPa or even higher.
- The standard search to compressive strength of PPTA filaments has been published in a paper by M.G. Northolt and D.J. Sikkema in Adv. in Pol. Sci., 98, page 336 (1990). These authors disclose that the compressive strength of polymer filaments increases with increasing modulus, but for PPTA filaments the compressive strength σc does not exceed the maximum value of about 0.85 GPa.
- It has now been found that the compressive strength of PPTA yarn can considerably be increased with regard to these commonly known PPTA yarns by applying a heat treatment, without the need to use halogenated or otherwise modified aryl moieties, which treatment is fundamentally different from the usual heat treatments that are performed for drying the yarn.
- To this end the invention relates to a method for obtaining a PPTA yarn with increased compressive strength by the steps of air gap spinning a PPTA spin dope to PPTA filaments, bundling the filaments to the yarn, washing and optionally neutralizing and drying the yarn, characterized in that these steps are followed by applying a heat treatment to the PPTA yarn comprising heating the yarn at a temperature of 340 to 510 ºC for 5 sec to 5 min under exclusion of oxygen.
- Thus this method renders PPTA yarns having improved compressive strength by applying a heating process for a relatively long time at relatively low tensions. This heating step is in addition to the commonly used steps of making PPTA yarns, including air gap spinning, which includes coagulating the spun filaments and bundling these to yarn, followed by one or more of well-known process steps as washing, neutralizing, drying, winding and the like.
- The best compressive strength improvement is obtained when the heat treatment of the yarn is performed at a temperature of 360 to 480 ºC for 20 sec to 2 min. It was found that the results improved at higher temperature at the lower end of the claimed time period, thus better results are obtained when the heat treatment is performed at a temperature of 410 to 440 ºC for 20 sec to 1 min, or even better when performed at a temperature of 425 to 435 ºC for 20 sec to 1 min. In general shorter heating times are used at higher heating temperatures.
- The best results are obtained when apart from temperature and heating time also the tension is controlled. Preferably the heat treatment is performed at a tension of 0.02 to 3 cN/dtex, more preferably at a tension of 0.1 to 0.5 cN/dtex, and most preferably at a tension of 0.1 to 0.3 cN/dtex.
- The heating step of this invention is performed under exclusion of oxygen. The presence of oxygen during this treatment has a negative influence on the tenacity of the yarn. Oxygen therefore must be removed as good as possible from the heating device, such as an oven, for instance by flushing with inert gas such as nitrogen, helium, and the like. In any case the amount of oxygen must be brought to less than 1 vol%, preferably less than 0.5 vol%.
- The PPTA yarns were spun from anisotropic solutions of aromatic polyamides in sulfuric acid, but other solvents such as NMP/calcium chloride can also be used. The aromatic polyamides were prepared using conventional polycondensation reaction techniques. The spin dopes could be prepared by mixing the polymer with sulfuric acid ice. The yarns can be spun via the known dry jet wet spinning procedure.
- The present method of the additional heat treatment may render PPTA yarns wherein the filaments have compressive strengths that have never been obtained earlier. Thus at any modulus the compressive strength of the filaments (of PPTA yarns) is higher than in the similar yarns not having undergone the additional heat treatment. The invention therefore has also to its objective PPTA yarns wherein the average compressive strength σc of its filaments is at least 0.8 + 2.5*10-3 *(E-100) GPa, wherein E is the modulus in GPa.
The term "average compressive strength" (σc) means the average of the measured compressive strength values of 3 filaments that are at randomly taken from the yarn. - Thus according to M.G. Northolt and D.J. Sikkema common PPTA yarns have filaments with compressive strength 0.5 GPa at a modulus of 50 GPa, whereas this PPTA yarn after the heat treatment of this invention has a compressive strength of at least about 0.68 GPa. PPTA yarns with compressive strength 0.95 GPa or higher are yarns that have never been obtained earlier. PPTA yarns having filaments with compressive strengths of at least 0.95 GPa, more preferably of at least 1 GPa, are therefore novel and also an objective of this invention. These yarns with extreme high compressive strength filaments are obtained by selecting optimum heating conditions with regard to temperature and heating time.
- The invention is further illustrated by the following non-limitative examples.
- The treatment was done in an oven of 3.66 m length. The oven was under nitrogen to a residual level of less than 0.3 vol% oxygen.
- Yarns were equilibrated at 21 °C and 65% RH. The compressive strength was determined via the elastica loop test (ELT) according to D.J. Sinclair, J. Appl. Phys., 21 (1950) 380. In this test a filament is bent into a single asymmetric loop wherein the diameters are a few millimeters, immersed in paraffin, covered with a glass slide, which is then gradually contracted. Images were acquired during contraction, followed by measuring the c- and α-axes, wherein the c-axis is the largest diameter and the α-axis is the smallest diameter of the loop. The compressive strength σc is calculated from c*, which is determined by taking the intersection of two lines that can be drawn through the graph c/a before and after kink bend formation. The c* is obtained by semi-automatic drawing both lines. Before kink bend formation the theoretical ratio c/a is 1.34.The compressive strength is calculated according to the equation:
wherein - σc:
- is compressive strength in GPa
- E
- is Youngs modulus in GPa from tensile measurements
- r
- is initial radius of the filament in mm, as determined with optical microscopy
- c*:
- is value of the c-axis at which the c/a-ratio starts to deviate from 1.34.
- Modulus, tenacity, EAB (elongation at break), and toughness of the yarns were measured according to ASTM D885.
- In a mixing vessel solid sulfuric acid having a concentration of 99.8% and high molecular weight PPTA were initially mixed at temperatures below 10 °C, Subsequently, the temperature of the polyamide sulfuric acid mixture was allowed to rise to room temperature resulting in a dry sandy mass, for use in making the spin dope. Alternatively, the PPTA and concentrated sulfuric acid can be mixed in a twinscrew extruder above room temperature to directly obtain the spin dope.
- PPTA spin dope was spun to filament yarn of different linear densities and finally washed and dried in the conventional manner. The yarn was heat treated in a tube oven at the temperatures and times as indicated in Table 1 in an inert environment (max. 0.25 vol.% O2). The properties of these yarns are listed in Table 1. PPTA is poly(para-phenyleneterephthalamide); Comp. = compression
Table 1 Mechanical properties of PPTA yarns after heat treatment Tension cN/dtex Heating time sec Temp °C Linear density dtex Tenacity mN/tex EAB % Modulus GPa Toughness J/g Comp. Strength Gpa -* - - 89 2195 3.2 91 35.7 0.56 0.36 28 380 86 2019 2.5 115 24.9 0.94 -* - - 71 2242 3.05 103 34.6 0.63 0.22 28 360 66 1978 2.3 123 22.7 0.98 0.75 28 360 66 1988 2.3 128 22.3 0.98 2.27 28 360 65 2103 2.2 135 22.8 0.86 0.22 28 400 65 2144 2.4 124 24.7 1.05 0.75 28 400 65 2085 2.3 130 22.8 1.01 2.27 28 400 65 2111 2.1 138 22.1 1.05 0.22 28 430 65 2052 2.2 128 22.4 1.25 0.75 28 430 65 2079 2.1 137 22 1.11 2.27 28 430 65 2032 2 145 19.9 0.99 2.27 56 400 65 2124 2.2 140 21.8 0.95 0.22 56 430 64 1903 2 134 18.8 1.22 -* - 1684 2030 3.09 91.3 30.8 0.5# 1.8 28 410 1649 1700 1.99 122.4 16.6 0.87 1.7 28 430 1642 1670 1.95 123 16.0 0.96 * comparative example: No heat treatment
# estimated
Claims (11)
- A method for obtaining a PPTA yarn with increased compressive strength by the steps of air gap spinning a PPTA spin dope to PPTA filaments, bundling the filaments to the yarn, washing and optionally neutralizing and drying the yarn, characterized in that these steps are followed by applying a heat treatment to the PPTA yarn comprising heating the yarn at a temperature of 340 to 510 ºC for 5 sec to 5 min under exclusion of oxygen.
- The method according to claim 1 wherein the heat treatment is performed at a temperature of 360 to 480 ºC for 20 sec to 2 min.
- The method according to claim 1 wherein the heat treatment is performed at a temperature of 410 to 440 ºC for 20 sec to 1 min.
- The method according to claim 1 wherein the heat treatment is performed at a temperature of 425 to 435 ºC for 20 sec to 1 min.
- The method according to any one of claims 1-4 wherein the heat treatment is performed at a tension of 0.02 to 3 cN/dtex.
- The method according to any one of claims 1-4 wherein the heat treatment is performed at a tension of 0.1 to 0.5 cN/dtex.
- The method according to any one of claims 1-4 wherein the heat treatment is performed at a tension of 0.1 to 0.3 cN/dtex.
- A PPTA yarn having filaments with an average compressive strength σc of at least 0.8 + 2.5*10-3 *(E-100) GPa, wherein E is the modulus in GPa.
- The PPTA yarn of claim 8 having filaments with an average compressive strength σc of at least 0.85 + 2.5*10-3 *(E-100) GPa, wherein E is the modulus in GPa.
- The PPTA yarn of claim 8 having filaments with an average compressive strength of at least 0.95 GPa.
- The PPTA yarn of claim 8 having filaments with an average compressive strength of at least 1.0 GPa.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK09153014.7T DK2218807T3 (en) | 2009-02-17 | 2009-02-17 | Heat treatment to increase the compressive strength of PPTA filaments |
ES09153014T ES2379506T3 (en) | 2009-02-17 | 2009-02-17 | Heat treatment to feed the compressive strength of PPTA filaments |
PL09153014T PL2218807T3 (en) | 2009-02-17 | 2009-02-17 | Heat treatment for increasing compressive strentgh of PPTA filaments |
EP09153014A EP2218807B1 (en) | 2009-02-17 | 2009-02-17 | Heat treatment for increasing compressive strentgh of PPTA filaments |
AT09153014T ATE545723T1 (en) | 2009-02-17 | 2009-02-17 | HEAT TREATMENT TO INCREASE THE PRESSURE STRENGTH OF PPTA FILAMENTS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP09153014A EP2218807B1 (en) | 2009-02-17 | 2009-02-17 | Heat treatment for increasing compressive strentgh of PPTA filaments |
Publications (2)
Publication Number | Publication Date |
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EP2218807A1 true EP2218807A1 (en) | 2010-08-18 |
EP2218807B1 EP2218807B1 (en) | 2012-02-15 |
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EP09153014A Active EP2218807B1 (en) | 2009-02-17 | 2009-02-17 | Heat treatment for increasing compressive strentgh of PPTA filaments |
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EP (1) | EP2218807B1 (en) |
AT (1) | ATE545723T1 (en) |
DK (1) | DK2218807T3 (en) |
ES (1) | ES2379506T3 (en) |
PL (1) | PL2218807T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102286794A (en) * | 2011-08-09 | 2011-12-21 | 中国石油化工股份有限公司 | High-performance fibers and preparation method thereof |
CN102839480A (en) * | 2012-10-02 | 2012-12-26 | 上海会博新材料科技有限公司 | Method for improving strength utilization rate of para-aramid fiber in reinforcing optic cable |
CN112458583A (en) * | 2020-10-22 | 2021-03-09 | 烟台泰和新材料股份有限公司 | Para-aramid fiber, preparation method thereof and application of para-aramid fiber in preparation of molten metal splash protection clothing |
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US3154610A (en) | 1961-05-31 | 1964-10-27 | Celanese Corp | Process of wet spinning polyamides and prevention of gel formation |
US3414645A (en) | 1964-06-19 | 1968-12-03 | Monsanto Co | Process for spinning wholly aromatic polyamide fibers |
US3673143A (en) * | 1970-06-24 | 1972-06-27 | Du Pont | Optically anisotropic spinning dopes of polycarbonamides |
US3869430A (en) | 1971-08-17 | 1975-03-04 | Du Pont | High modulus, high tenacity poly(p-phenylene terephthalamide) fiber |
USRE30352E (en) | 1966-06-13 | 1980-07-29 | E. I. Du Pont De Nemours And Company | Optically anisotropic aromatic polyamide dopes |
EP0247889A2 (en) * | 1986-05-30 | 1987-12-02 | E.I. Du Pont De Nemours And Company | High modulus poly-p-phenylene terephthalamide fiber |
EP0388878A2 (en) * | 1989-03-20 | 1990-09-26 | E.I. Du Pont De Nemours And Company | On-line fiber heat treatment |
EP0759454A1 (en) * | 1994-05-11 | 1997-02-26 | Asahi Kasei Kogyo Kabushiki Kaisha | para-ORIENTED AROMATIC POLYAMIDE MOLDING AND PROCESS FOR PRODUCING THE SAME |
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JP2007297722A (en) * | 2006-04-27 | 2007-11-15 | Du Pont Toray Co Ltd | Poly-para-phenylene terephthalamide fiber and method for producing the same fiber and its use |
WO2008075751A1 (en) * | 2006-12-15 | 2008-06-26 | Teijin Techno Products Limited | Heterocyclic ring-containing aromatic polyamide fiber, method for producing the same, fabric comprising the fiber, fiber-reinforced composite material reinforced with the fiber |
-
2009
- 2009-02-17 PL PL09153014T patent/PL2218807T3/en unknown
- 2009-02-17 DK DK09153014.7T patent/DK2218807T3/en active
- 2009-02-17 ES ES09153014T patent/ES2379506T3/en active Active
- 2009-02-17 AT AT09153014T patent/ATE545723T1/en active
- 2009-02-17 EP EP09153014A patent/EP2218807B1/en active Active
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Cited By (5)
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CN102286794A (en) * | 2011-08-09 | 2011-12-21 | 中国石油化工股份有限公司 | High-performance fibers and preparation method thereof |
CN102286794B (en) * | 2011-08-09 | 2013-06-12 | 中国石油化工股份有限公司 | High-performance fibers and preparation method thereof |
CN102839480A (en) * | 2012-10-02 | 2012-12-26 | 上海会博新材料科技有限公司 | Method for improving strength utilization rate of para-aramid fiber in reinforcing optic cable |
CN112458583A (en) * | 2020-10-22 | 2021-03-09 | 烟台泰和新材料股份有限公司 | Para-aramid fiber, preparation method thereof and application of para-aramid fiber in preparation of molten metal splash protection clothing |
CN112458583B (en) * | 2020-10-22 | 2021-09-17 | 烟台泰和新材料股份有限公司 | Para-aramid fiber, preparation method thereof and application of para-aramid fiber in preparation of molten metal splash protection clothing |
Also Published As
Publication number | Publication date |
---|---|
ES2379506T8 (en) | 2012-06-11 |
DK2218807T3 (en) | 2012-03-26 |
ES2379506T3 (en) | 2012-04-26 |
ATE545723T1 (en) | 2012-03-15 |
PL2218807T3 (en) | 2012-05-31 |
EP2218807B1 (en) | 2012-02-15 |
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