CN1106867A - Spinning process for the preparation of high thermoweldability polyolefin fibers - Google Patents

Spinning process for the preparation of high thermoweldability polyolefin fibers Download PDF

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Publication number
CN1106867A
CN1106867A CN94107510A CN94107510A CN1106867A CN 1106867 A CN1106867 A CN 1106867A CN 94107510 A CN94107510 A CN 94107510A CN 94107510 A CN94107510 A CN 94107510A CN 1106867 A CN1106867 A CN 1106867A
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fiber
copolymer
spinning
weight
minute
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Granted
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CN94107510A
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CN1069352C (en
Inventor
L·施帕诺里
G·布拉卡
L·平诺卡
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Himont Inc
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Himont Inc
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Priority claimed from IT001308 external-priority patent/IT1264839B1/en
Priority claimed from ITMI940390 external-priority patent/IT1274029B/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/544—Olefin series
    • 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
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • 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
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
    • 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
    • D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/30—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising olefins as the major constituent
    • 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
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Artificial Filaments (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Multicomponent Fibers (AREA)
  • Cell Separators (AREA)

Abstract

Disclosed are polyolefin fibers, for the preparation of nonwoven fabrics, prepared by using dies having a real or equivalent output diameter of the holes greater than or equal to 0.5 mm, with the proviso that for fibers having a count greater than or equal to 4 dtex, the ratio of the said output hole diameter to the count is greater than or equal to 0.06 mm/dtex.

Description

Spinning process for the preparation of high thermoweldability polyolefin fibers
The present invention relates to prepare the spinning process that the weldable polyamide fiber particularly is suitable for preparing supatex fabric based on polyacrylic fiber.
Described supatex fabric needing to be particularly suitable for the considerable flexibility and the occasion of tear resistance, for example be used as the cover of diaper and amenities, they are by the lower number fiber production that is generally 0.2 to 5 dtex, also as film, they are to be fiber production between 3 and 10 dtexs by number number.The basic demand that is used for the polyamide fiber of supatex fabric is that they must be bonded to each other by the synergy as the temperature and pressure on hot calendering technology basis.The feature of this being called " weldable " always is not present in the polyamide fiber, perhaps is degree varies at least.In fact, weldable depends on the polyolefinic type of desiring spinning, the spinning condition of the additive that it comprised, processing type and use in itself.
Disclosed european patent application 391438 has been described the polyolefin composition that is suitable for spinning, it is characterized in that existing being selected from organic phosphite and/or phosphinate (phosphonites), HALS(hindered amine as light stabilizer) stabilizing agent and randomly have phenol antioxidant.
Above-mentioned patent application has also been described by conventional spinning process, particularly produces the weldable fiber of the method for staple fibre by the polyolefin composition acquisition of aforementioned stable.Because making, selection of stabilizers provided good weldable among the embodiment in the case.In the above-described embodiments, the routine " the long method of spinning " that has the punch die of 0.4mm diameter pore by use is installed (one of feature is fiber winding speed height), and the number of making number is the fiber of the foregoing description of 1.9 to 2.2 dtexs.
Using the punch die of minor diameter (smaller or equal to 0.4mm) pore to produce the lower number fiber all is typical for above-mentioned long spinning equipment and " short spinning " device of being used for producing staple fibre, because it can obtain the high level of production.
In fact, pore diameter is more little, and the pore number is high more in the punch die, this means that time per unit produces more fiber.Here it is this area restriction pore diameter greater than the use of the punch die of 0.4mm to produce the reason of high number number fiber (being higher than 5 dtexs).
Now very surprisingly find, in the production and spun-bond process of staple fibre, use diameter to cause significantly improving of fiber weldable more than or equal to the punch die of the pore of 0.5mm, precondition is for the fiber of number number greater than 4 dtexs, and pore diameter is enough high with the ratio of number number.
Correspondingly, the number of the invention provides number is preferably 0.2 to 10 dtex, the more preferably weldable fiber preparation method of 0.5 to 3 dtex, wherein the actual or of equal value output diameter of the pore of employed punch die is more than or equal to 0.5, particularly 0.5 to 2mm, and precondition is for the fiber of number number more than or equal to 4 dtexs, and the ratio of described output pore diameter and number number is more than or equal to the 0.06mm/ dtex, be preferably greater than or equal the 0.08mm/ dtex, more preferably greater than or equal the 0.1mm/ dtex.
Here employed " the output diameter of pore " is that the outer surface at punch die is the diameter of the pore of the fiber front surface that leaves punch die.In the whole thickness of punch die, the diameter of pore can be different with the output pore diameter." pore output diameter of equal value " refers to that pore is not the situation of circle, in this case, is the object of the invention, can consider the desirable diameter of a circle that area equates with output pore area, and this is just corresponding to above-mentioned diameter of equal value.
As previously mentioned, the inventive method can be spun or shortly spins subtraction unit and spunbond device carries out by the length that use is used to produce staple fibre.
Long spinning equipment generally includes the first spinning section, and fiber is extruded and carries out air cooling in quench column in this section.Then, these fibers enter fininshing step, in this process they are stretched, curl-expanded and cut-out.In general, above-mentioned fininshing step carries out with respect to spinning batch (-type) ground, and being gathered into total's number at fiber roving is that the specific part of 100 to 200,000 spies' single rove carries out.Described rove is sent into stretching then, is curled-expanded and shearing device, and these devices are in turn with 100 to 200m/ minutes spinning speed work.In the long spinning equipment of other type, above-mentionedly finish the stage and the spinning stage carries out in turn.In the case, fiber directly by collector to draw roll, their certain proportions (being not more than 1.5) that is stretched at this.With about 5,000 spies' of their numbers of being gathered into number rove, follow then to curl with the much the same speed of spinning speed-expanded and cut-out.
And long spinning equipment compares technological parameter with short spinning equipment and controls better.Usually the process conditions that adopt when using long spinning equipment are as follows:
Orifice flow speed〉0.2g/ minute;
Fibril aggregation speed 〉=500m/ minute;
Fiber leaves the space of cooling off and solidifying behind the punch die〉0.5m.
When adopting long spinning equipment to operate and employed punch die when one of as above described, above-mentioned condition also can be used in the technology of the present invention.
Preferably operate in the time range below:
-orifice flow speed is 0.15 to 1.0g/ minute, preferred 0.2 to 0.5g/ minute;
-fibril aggregation speed 500 to 3500m/ minutes, preferred 600 to 2000m/ minutes;
And, draw ratio preferably from 1.1 to 4.0.
The detailed introduction of long spinning equipment is referring to Fried helm Hauser " Plastics Extrusion Technology ", and Hauser publishes, 1988, the 17 chapters.
The weldable of having found staple fibre improves with the reduction of fibril aggregation speed.The situation of staple fibre particularly, the inventive method is advantageous particularly when using short spinning equipment, and a feature of described device is low fibril aggregation speed (less than 500m/ minute).
But above-mentioned short spinning equipment continued operation, because spinning speed and stretching, curl and cut-off velocity is complementary, and because the reducing of its simplicity and cumulative volume, to spin method more economical than long for these devices, and be suitable for small-scale production.Yet up to now, short spinning equipment can't be produced good (for example be higher than 2.5N, record by method described in the embodiment) staple fibre of weldability value.Therefore, when using short spinning equipment, the inventive method is with regard to particular importance, because it has solved the problem of operating production weldable staple fibre with described device.
The process conditions that are suitable for most the short spinning equipment of use of the present invention are as follows.
Orifice flow speed 0.005 to 0.18g/ minute, preferred 0.008 to 0.070g/ minute, more preferably 0.010 to 0.030g/ minute.Fibril aggregation speed is from 30 to 500m/ minutes, and preferred 40 to 250m/ minutes, more preferably 50 to 100m/ minutes.Draw ratio from 1.10 to 3.50, preferred 1.20 to 2.50.And cooling of punch die output fiber and curing space (cooling space) are preferably greater than 2mm, and more preferably greater than 10mm, preferred especially 10 to 350mm.
Described cooling is usually by aerojet or mobile causing.Therefore, cooling space is the distance between punch die and above-mentioned air jet or the air-flow.
At last, the preferred draw speed of the present invention is lower than 100 ℃, particularly in 15 ℃ to 50 ℃ scopes.The further details of short spinning equipment can be referring to M.Ahmed, " Polypropylene fibers science and technology ", Elsevier Scientific Publishing Company(1982) the 344-346 page or leaf.
Above-mentioned length spin and the spinning temperature of lacking spinning equipment usually in 240 ℃ to 310 ℃ scopes, in preferred 270 ℃ to the 300 ℃ scopes.
Employed equipment is usually included in the air-breathing aggregation apparatus of extruder, cooling tower and use Venturi tube that a punch die is arranged on the spinning head in melt spun processes.
Usually assemble filament with conveyer belt below the device of this use air velocity controlling fiber aggregation velocity, they are scattered in a fiber web with thermal welding on calender there.
According to the present invention, when using common melt-spun machine, process conditions are easily below using.
Orifice flow speed was from 0.1 to 2.0g/ minute; Preferred 0.2 to 1.0g/ minute.
Fiber leaves the cooling behind the punch die and solidifies space (cooling space) and is preferably greater than 2mm, more preferably greater than 10mm, particularly in 10 to 350mm scopes.
Fiber is usually by means of the air jet or the cooling of flowing.Cooling space is the distance between punch die and air jet or the air-flow.
Spinning temperature is usually between 230 ℃ to 300 ℃, between preferred 240 ℃ to 280 ℃.
In general, the olefin polymer of the available fiber of production weldable in the methods of the invention is R-CH=CH 2(wherein R is hydrogen atom or C to alkene 1-6Alkyl) homopolymers or copolymer and composition thereof.Preferred especially following polymers:
1) isotaxy or be mainly isotactic Noblen;
2) propylene and ethene and/or C 4-8The crystalline copolymer of alpha-olefin (for example 1-butylene, 1-alkene, 1-octene, 4-methyl isophthalic acid-heptene), wherein the comonomer total content is in 0.05% to 20%(weight), or described copolymer and isotaxy or be mainly the mixture of isotactic Noblen
3) heterophasic copolymer comprises (A) Noblen and/or 2) copolymer in one and a kind of elastomer composition (B), this composition comprises ethene and propylene and/or C 4-8The copolymer of alpha-olefin, and randomly comprise a small amount of diene (for example butadiene, 1,4-hexadiene, 1,5-hexadiene, ethylidene-1-ENB).
(B) amount of diene is preferably from 1% to 10%(weight in).
Heterophasic copolymer (3) is according to known method, mixes or makes by sequential co-polymerization by the composition with molten condition, and comprise 5%-80%(weight usually) copolymer composition (B).
The instantiation that is particularly suitable for preparing the olefin polymer of weldable fiber is following random copolymer of propylene:
A) crystalline propylene random copolymer, it comprises 1.5% to 20%(weight) ethene or C 4-C 8Alpha-olefin;
B) crystalline propylene random copolymer, it comprises 85% to 96%(weight) propylene, 1.5% to 5%(weight) ethene and 2.5% to 10%(weight) C 4-C 8Alpha-olefin.
C) crystalline propylene random copolymer composition, it comprises (percetage by weight):
(1) 30% to 65% propylene and C 4-C 8The copolymer of alpha-olefin, this copolymer comprise 80% to 98% propylene;
The copolymer of (2) 35% to 70% propylene and ethene is randomly with 2% to 10% C 4-C 8The copolymerization of alpha-olefin; Described copolymer is at above-mentioned C 4-C 8Alpha-olefin comprises 2% to 10% ethene when not existing, at C 4-C 8When existing, alpha-olefin comprises 0.5% to 5% ethene;
D) composition of crystalline propylene random copolymer and crystalline ethylene copolymer comprises (percentage by weight):
One or more crystalline polypropylenes of (1) 40% to 70% and one or more are selected from ethene and/or C 4-C 8The copolymer of the comonomer of alpha-olefin, wherein the content of one or more comonomers is 5% to 20%;
(2) 30% to 60%MFR E(by ASTM D1238) be 0.1 to 1.5 LLDPE.
Above-mentioned copolymer also can be mixed with each other and/or with isotaxy or be mainly isotactic Noblen and mix.
Other instantiation that is particularly suitable for preparing the olefin polymer of weldable fiber comprises 5% to 95%(weight) isotaxy or be mainly isotactic propylene homopolymer and/or above-mentioned a) to d) type atactic propene copolymer and 95% to 5%(weight) be selected from the heterophasic copolymer of following composition:
(I) composition comprises:
(ⅰ) 10-60 weight portion isotacticity index is higher than 90 Noblen, or propylene and ethene and/or another C 4-C 8The crystalline copolymer of alpha-olefin, it comprises the weight greater than 85%() propylene and isotacticity index be higher than 85;
(ⅱ) the crystalline polymer composition that contains ethene of 10-40 weight portion is insoluble to dimethylbenzene at ambient temperature;
(ⅲ) 30-60 weight portion amorphous state ethylene-propylene copolymer composition randomly comprises the small part diene, is dissolved in the dimethylbenzene at ambient temperature, and comprises 40-70%(weight) ethene;
(II) composition comprises:
(ⅰ) 10-50 weight portion isotacticity index is higher than 80 Noblen or propylene and ethene and/or C 4-C 8The copolymer of alpha-olefin, this copolymer comprise the weight above 85%() propylene;
(ⅱ) the 5-20 weight portion contains the copolymer composition of ethene, is insoluble in the dimethylbenzene at ambient temperature.
(ⅲ) 40-80 parts by weight of ethylene and propylene and/or C 4-C 8Alpha-olefin and randomly with the copolymer composition of small part diene, comprise and be less than 40%(weight) ethene, described composition is dissolved in the dimethylbenzene at ambient temperature, intrinsic viscosity is 1.5 to 4dl/g.
Provided C above 4-C 8The instantiation of alpha-olefin and diene.
Usually, when being used to produce staple fibre, the melt flow rate (MFR) of above-mentioned olefin polymer (MFR) is measured according to ASTM D1238-L, at 0.5 to 100g/10 minute, preferably in 1.5 to 35g/10 minutes scopes.
When being used for the melt-spun device of the inventive method, the MFR value of above-mentioned olefin polymer preferably between 5 to 25g/10 minutes, particularly 8 to 15g/10 minutes.These MFR values have constituted the another distinguished feature of the inventive method, because polyolefinic MFR was greater than 25g/10 minute in conventional melt spun processes.
Above-mentioned MFR value directly obtains in polymerization process, or obtains by control degradation.For obtaining described control degradation, for example the stage adds organic peroxide on the spinning threadling of olefin polymer or before granulation.Olefin polymer is usually with pill or the non-particle of extruding, and for example the form of sheet or ball is used.
The olefin polymer that carries out spinning with the arbitrary method of the present invention is preferably used the kind of disclosed european patent application 391438 described stabilizing agents and quantity stabilisation.According to described patent application, the polyolefin that is used for spinning comprises one or more following stabilizing agents:
A) 0.01-0.5%(weight) one or more organic phosphites and/or phosphinate;
B) 0.005-0.5%(weight) one or more HALS(hindered amine as light stabilizer); Randomly one or more concentration are no more than 0.02%(weight) phenol antioxidant.
The aforementioned stable agent can join by the method for granulation or surface coated in the polyolefin, perhaps they can with the polyolefin mechanical mixture.
The instantiation of phosphite ester is: tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester, sell by CIBA GEIGY, and trade name Irgafos 168; Diphosphorous acid distearyl acyl group pentaerythritol ester is sold trade name Weston618 by BORG-WARNER CHEMCAL; Phosphorous acid 4,4 '-two (the 3-methyl-6-tert butyl phenyl-2 1 tridecyl) esters of butylidene, ADEKA ARGUS CHEMCAL sells, trade name P; Tricresyl phosphite (nonyl phenyl) ester; Two (2, the 4-di-t-butyl) pentaerythritol esters of diphosphorous acid; Sold by BORG-WARNER CHEMCAL, trade name Ultranox 626.
The preferred embodiment of phosphinate be two phosphonous acid four (2, the 4-di-tert-butyl-phenyl) 4,4 '-diphenylene (diphenylilene) ester, the Sandostab P-EPQ that Sandoz sells is exactly based on this.
HALS is the amine that contains one or more replacements, the monomer or the oligomeric compound of preferred pyridine radicals.
The instantiation of HALS that contains the pyridine radicals of replacement is the following commodity that CIBA-GEIGY sells:
Chimassorb?944
Chimassorb?905
Tinuvin?770
Tinuvin?292
Tinuvin?622
Tinuvin?144
Spinuvex?A36
With U.S. GYANAMID product sold Cyasorb UV 3346.
The example of phenol antioxidant is: three (the 4-tert-butyl group-3-hydroxyl-2,6-dimethyl benzyl)-s-triazines-2,4, and 6-(1H, 3H, 5H)-and triketone, sell by U.S. CYANAMID, trade name Cyanox 1790; Two [ethyl (3, the 5-di-tert-butyl-4-hydroxyl benzyl) phosphonic acids) calcium; 1,3,5-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl)-s-triazine-2,4,6(1H, 3H, 5H) triketone; 1,3,5-trimethyl-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene; Four [3-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester; 3-(3, the 5-di-tert-butyl-hydroxy phenyl) octyl propionate, to sell by CIBA GEIGY, trade name is respectively Irganox 1425; Irganox 3114; Irganox1330, Irganox 1010, and Irganax 1076; Abietic acid 2,6-dimethyl-3-hydroxyl-4-tert-butyl group benzyl ester.
The following example is used for illustration purpose rather than limitation of the present invention.
The weldable assessment of fiber
In general, in order to assess the weldable of fiber, by under a certain specified criteria, measuring by the supatex fabric calendering of fiber manufacturing.Then, mensuration is parallel with calender tears the required tension force of described supatex fabric with vertical direction.
The tension value of measuring in the method is considered to the measuring of weldable ability of fiber.
But the dispersing uniformity that the result mainly is subjected to the completion feature (curl, Surface Finishing, thermosetting etc.) of fiber and enters the fiber of calender influences, for avoiding these unfavorable factors and obtaining the assessment of more direct fiber weldable, formulated a kind of method, will describe in detail below.
Prepare sample (ASTM D1577-7 method) by 400 extraordinarily thick yarns, 0.4 meter long, is made up of continuous fibers.
After rove is twisted with the fingers 80 times, two end points are combined, thereby the two parts that obtain rove are wound in the product of a rope.
Use Bruggel HSC-ETK heat sealing machine, under 150 ℃ of plate temperatures, operate, use the clamp pressure and the weld time in 1 second of 800N, on described sample, carry out welding.
Use dynamometer to measure the required mean force of two parts of separation rove (these two parts constitute a sample at welding point).The result is that the value that will measure at least eight times on average obtains, and represents with newton, represents the heat seal strength of fiber.
Carry out the polymer of spinning
The polymer that is used for preparing fiber in an embodiment is as follows:
The polypropylene I
The mechanical impurity of Noblen, the MFRL13g/10 of Noblen minute, be partially soluble in dimethylbenzene at 25 ℃, be equivalent to 3.5%(weight), having the sheet form (average diameter of particles 450 μ m) that the control particle diameter distributes, it comprises:
Additive concentration (weight)
Irganox?1076 0.07%
Irganox?3114 0.01%
Irgafos?168 0.07%
Calcium stearate 0.05%
Described mechanical impurity is by mentioned component being joined CACCIA speed blender (LABO 30 types), obtaining in 4 minutes 1400 rev/mins of mixing.
The polypropylene II
The composition identical with the polypropylene I, but be the form that is pill, and described mechanical impurity is pressed as above method extruding pelletization.
The polypropylene III
Noblen, spherical particle, diameter 2 are to 3mm, and MFR is 12.2g/10 minute.Be partially soluble in the dimethylbenzene at 25 ℃, be equivalent to 4.2%(weight), following composition is added on the surface:
Additive concentration (weight)
Irganox?1076 0.01%
Chimassorb?994 0.02%
Sandostab?P-EPQ 0.05%
Calcium stearate 0.05%
Chimassorb 944 is the ammoniums that are obstructed of following formula
Wherein n is generally 2 to 20.
Embodiment 1
Use polypropylene I defined above, at LEONARD 25 long spinning equipments (by Costruzioni Meccaniche Leonard-Sumirago(VA)-Italy produce and market) last preparation staple fibre.Device is constructed as follows:
-extruder, diameter are the screw rod of 25mm, and the ratio of length/diameter is 25, and flow rate is 1-6kg/ hour;
-2.5cm 3The measuring pump of/commentaries on classics
-have 61 output diameters be the punch die of 0.8mm circular hole;
-will extrude the system that long filament cools off by transverse injection air (18-20 ℃);
-have an aggregation apparatus of 1000-6000 rice/minute velocity interval;
Stretching device in the-steam oven.
Use following process conditions to carry out spinning operation:
280 ℃ of punch die temperature
Orifice flow speed 0.3g/ minute
1400 meters/minute of aggregation velocities
Draw ratio 1.3
100 ℃ of draft temperatures
Feature at the resulting fiber of the method is:
-filament number several 1.7 dtexs
(according to ASTM D1577-79)
-weldable 4.1N
The comparative example 1
Use polymer, device and the condition identical with embodiment 1, just punch die has 61 circular holes, exports diameter 0.4mm.
The feature of the fiber that obtains with the method is:
-filament number several 1.7 dtexs
-weldable 2.0N
Embodiment 2
Use polypropylene I defined above, use the weak point of following formation to spin pilot-plant and prepare staple fibre:
-single screw extrusion machine, diameter 120mm, length is equivalent to 30 diameters;
-150cm 3The measuring pump of/commentaries on classics
-have 3.5 * 10 4The punch die of individual circular hole and 0.6mm output diameter, described pore is placed to crown;
-cooling device, coaxial with the hat of punch die pore, on perpendicular to the plane of leaving fiber, eject 20 ℃ air.
Spinning condition is as follows:
300 ℃ of-temperature
-orifice flow speed 0.018g/ minute
Between-punch die and the cooling blast apart from 5mm
-aggregation velocity 70m/ minute
80 ℃ of-draft temperatures
-draw ratio 1.4
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 6.85N
Embodiment 3
Use device and the condition identical, prepare staple fibre, only be to use the polypropylene III with embodiment 2.
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 6.5N
Embodiment 4
Use polymer, device and the condition identical with embodiment 2, the preparation staple fibre, just between punch die and the cooling blast apart from being 15mm.
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 7.6N
Embodiment 5
Use polymer, device and the condition identical with embodiment 2, the preparation staple fibre just stretches generation at ambient temperature.
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 10N
The comparative example 2
Use the polymer manufacture staple fibre identical, use the industrial equipment with 8 identical described in the embodiment 2 spinning unit formations, but punch die has 5.18 * 10 with embodiment 2 4Individual output diameter is the circular hole of 0.4mm.Spinning condition is:
285 ℃ of-temperature
-orifice flow speed 0.018g/ minute
Between-punch die and the cooling blast apart from 5mm
-aggregation velocity 64m/ minute
80 ℃ of-draft temperatures
-draw ratio 1.5
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 2.35N
The comparative example 3
Use device and the condition identical to prepare staple fibre, only be to use the polypropylene III with comparative example 2.
Spinning condition is:
295 ℃ of-temperature
-orifice flow speed 0.024g/ minute
Between-punch die and the cooling blast apart from 5mm
-aggregation velocity 70m/ minute
80 ℃ of-draft temperatures
-draw ratio 1.35
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 2.2N
Embodiment 6
Use the polypropylene I, with BARMAG 25.2E1/24D type melt-spun device (BARMER MASHINENFAB RIK A.G.Manfacture production and selling) preparation fiber.Device is arranged as follows:
-extruder, diameter are the screw rod of 25mm, and the ratio of length/diameter is 24, and the extruder flow rate is 0.3-1.2kg/ hour;
-0.6cm 3The measuring pump of/commentaries on classics
-delivery outlet diameter with 37 circular cross-sections is the pore punch die of 0.8mm;
-make the system that fiber cools off that extrudes by transverse injection air (18-20 ℃);
-using the aggregation apparatus of bleeding of Venturi tube, aggregation velocity is between 500-4000m/ minute.
Spinning process condition is as follows:
280 ℃ of-punch die temperature
-orifice flow speed 0.6g/ minute
-aggregation velocity 2700m/ minute
-punch die and the cooling air jet between apart from 20mm
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 5.4N
The comparative example 4
Using the polymer identical with embodiment 6, identical device and identical condition of work, is that punch die has 37 circular cross-section holes, delivery outlet diameter 0.4mm.
The fiber characteristics that obtains with the method is:
-filament number several 2.2 dtexs
-weldable 2.04N
Embodiment 7
Use the polypropylene II, prepare fiber and non-weaving cloth with the melt-spun Chinese style device of German LURGI company manufacturing.Device is arranged as follows:
-contain the rectangular die in 931 circular cross-section holes, delivery outlet diameter 0.9mm.
-20 ℃ air-cooling apparatus acts on the plane perpendicular to the fiber of exporting.
Spinning condition is as follows:
280 ℃ of-temperature
-orifice flow speed 0.52g/ minute
Between-punch die and the cooling blast apart from 30mm
-aggregation velocity 2300m/ minute
The fiber characteristics that obtains with the method is:
-filament number several 2.3 dtexs
-weldable 6.4N
Embodiment 8
Use the device identical to prepare fiber, and work under the same conditions with embodiment 6, but use polypropylene III.
The fiber that obtains has following feature:
-filament number several 2.2 dtexs
-weldable 5.8N
The comparative example 5
Use the polymer identical with embodiment 8, the device identical with embodiment 6 prepares fiber, but the punch die that installs contains 37 circular cross-section holes and the delivery outlet diameter equals 0.4mm.
Resulting fiber has following feature:
-filament number several 2.2 dtexs
-weldable 2.1N

Claims (14)

1, a kind of method for preparing the weldable polyamide fiber, wherein the actual or of equal value output diameter of the pore of employed punch die is more than or equal to 0.5mm, precondition is for the fiber of number number more than or equal to 4 dtexs, and the ratio of described pore output diameter and number number is more than or equal to the 0.06mm/ dtex.
2, the process of claim 1 wherein the actual of pore or output diameter of equal value from 0.5 to 2mm.
3, the process of claim 1 wherein that long spinning equipment that use to produce staple fibre operates.
4, the method for claim 3, wherein orifice flow speed is 0.15 to 1g/ minute, fibril aggregation speed 500 to 3500m/ minutes, draw ratio 1.1 to 4.0.
5, the process of claim 1 wherein that short spinning equipment that use to produce staple fibre operates.
6, the method for claim 5, wherein orifice flow speed is 0.005 to 0.18g/ minute, fibril aggregation speed is 30 to 500m/ minutes, draw ratio 1.10 to 3.50.
7, the method for claim 5, wherein cooling space is greater than 2mm.
8, the method for claim 5, use therein draft temperature are lower than 100 ℃.
9, the process of claim 1 wherein and use the melt-spun device to operate.
10, the method for claim 9, wherein orifice flow speed is 0.1 to 2.0g/ minute, fibril aggregation speed 400 to 4500m/ minutes.
11, the method for claim 10, wherein cooling space is greater than 2mm.
12, the method for claim 9, the MFR of olefin polymer that wherein carries out spinning was from 5 to 25g/10 minutes.
13, the process of claim 1 wherein that the olefin polymer that carries out spinning is to be selected from:
1) isotaxy or be mainly isotactic Noblen;
2) propylene and ethene and/or C 4-8The crystalline copolymer of alpha-olefin, wherein the comonomer total content is in 0.05% to 20%(weight), or described copolymer and isotaxy or be mainly the mixture of isotactic Noblen;
3) heterophasic copolymer comprises (A) Noblen and/or 2) copolymer in one and a kind of elastomer composition (B), this composition comprises ethene and propylene and/or C 4-8The copolymer of alpha-olefin, and randomly comprise a small amount of diene.
14, the process of claim 1 wherein that the olefin polymer that carries out spinning comprises one or more following stabilizing agents:
A) 0.01-0.5%(weight) one or more organic phosphites and/or phosphinate;
B) 0.005-0.5%(weight) one or more HALS; And randomly comprise concentration and be no more than 0.02%(weight) one or more phenol antioxidant.
CN94107510A 1993-06-17 1994-06-17 Spinning process for the preparation of high thermoweldability polyolefin fibers Expired - Fee Related CN1069352C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI93A13008 1993-06-17
IT001308 IT1264839B1 (en) 1993-06-17 1993-06-17 Spinning process for prodn. of thermo:weldable polyolefin fibres - provides nonwoven fabrics with good softness and tear resistance e.g. cover:stock for nappy
ITMI94A00390 1994-03-04
ITMI940390 IT1274029B (en) 1994-03-04 1994-03-04 Spinning process for prodn. of thermo:weldable polyolefin fibres - provides nonwoven fabrics with good softness and tear resistance e.g. cover:stock for nappy

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CN1069352C CN1069352C (en) 2001-08-08

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EP0629720A2 (en) 1994-12-21
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FI942889A (en) 1994-12-18
CA2126013A1 (en) 1994-12-18

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