Classifications

• • 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
  • D01F1/00—General methods for the manufacture of artificial filaments or the like
  • D01F1/02—Addition of substances to the spinning solution or to the melt
  • D01F1/10—Other agents for modifying properties
• • 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
  • D01D5/098—Melt spinning methods with simultaneous stretching
• • 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
  • D01F6/44—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

Definitions

• the invention relates to a process for the production of polypropylene monofilaments having a melt viscosity index (MFI) 230 ° C / 2.16 kg from 2 to 16 g / 10 min, which have a diameter greater than 0.050 mm and improved abrasion resistance; it also relates to monofilaments of this polypropylene, as well as their use.
• MFI melt viscosity index
• Two-dimensional polypropylene textile articles are of great interest, as chemically and mechanically resistant filtration means, for filtration in the chemical, pharmaceutical and food industries.
• relatively coarse monofilaments are required, which have a diameter greater than
• Monofilaments of pure polypropylene have the disadvantage of forming a lot of dust due to the low resistance of this substance to abrasion during the weaving process.
• the abrasion problem is also known for other thermoplastics.
• PEP-A2-0 784 107 cites monofilaments spun in the molten state, of polyamide, polyester or polypropylene, intended for the fabrics of paper machines and the threads of edge trimmers.
• abrasion resistant monofilaments are obtained using 70 to 99% by weight of fibrogenic polymer and 1 to 30% by weight of a polyethylene / polypropylene rubber, modified with maleic anhydride. , and other additives.
• the examples are however limited, as far as the fibrogenic polymer is concerned, to polyamide 6 and to polyethylene terephthalate, as well as to a copolyamide of PA66 and PA6. Spinning speeds are not specified.
• EP-A-1059370 a process is also known for manufacturing polypropylene multifilaments intended for textile applications.
• an isotactic polypropylene, catalyzed by a metallocene is used, the melt viscosity index of which must be greater than 19 g for 10 minutes if the desired shrinkage characteristics are to be achieved. Indeed, to obtain a low shrinkage, high values of the MFI are necessary.
• Yet another problem consists in making available the use of coarse monofilaments, having good abrasion resistance, for the manufacture of two-dimensional technical articles, in particular intended for filtration.
• polypropylene use is preferably made of a homopolymer having a melt viscosity index of more than 2 g / 10 min, preferably from 6 to 13 g / 10 min, in particular from 12 to 13 g / 10 min.
• An MFI of more than 16 g / 10 min has the drawback of giving insufficient mechanical characteristics and poor resistance to abrasion.
• an additive consisting of a combination of lubricant, filler and thermal stabilizer.
• lubricant 0.5 to 1.2% by weight of polyethylene waxes, calcium carbonate and hindered phenols have been found to be particularly suitable.
• a lubricant in another variant, it is suitable to use as an additive 0.05 to 1.0% by weight, in particular 0.3 to 1.0% by weight, of a lubricant.
• a lubricant particularly suitable as lubricants are the metal salts of carboxylic acids, linear or branched hydrocarbons, fluorinated elastomers, polydimethylsiloxanes.
• fillers as an additive.
• fillers 0.01 to 0.1% by weight of aerosils and 0.1 to 1.0% by weight of calcium carbonate have been found to be particularly suitable.
• a thermal stabilizer Phenols, phosphites and sterically hindered phosphonites have been found to be particularly suitable.
• it is suitable to use as additive 1 to 20% by weight of a polypropylene / polyethylene copolymer having a melting point> 140 ° C.
• the monofilaments have a resistance of at least 50 cN / tex, for an elongation corresponding to the maximum tensile force (elongation at break) of less than 35%, preferably less than 30%.
• a resistance of less than 50 cN / tex has the drawback of multiplying the breaks in the yarn during the weaving process.
• the monofilaments have an abrasion of less than 0.05%.
• the abrasion is greater than 0.05%, irregularities occur during weaving, due to too rapid fouling of the combs. This makes it necessary to shorten the intervals between cleanings, which decreases the productivity of the loom.
• the monofilaments are characterized by a relative breaking energy> 100% after 24 hours treatment at 120 ° C., in particular after aging in an oven. This has the advantage of increasing the service life of the filters when they are subjected to relatively high thermal stress and to harsh chemicals.
• the monofilaments according to the invention are particularly suitable for the manufacture of two-dimensional articles intended for filtration in the chemical, pharmaceutical and food industries.
• melt viscosity index 230 ° C / 2.16 kg varying from 6.0 to 13.0 g / 10 minutes.
• 50 kg of polypropylene granulate are mixed each time, using 100 kg drums and an eccentric mixer. Mixing takes place, depending on the additive, according to two different processes. The different methods are explained in the examples.
• the granulated / additive mixture is admitted directly into the extruder and melted.
• Spinning pump displacement: 10 cm 3 / revolutions
• Spinning block electrically heated Titration pump 23.19 revolutions / min Dies: diameter: 0.7 mm capillary length: 3 x D
• Drawing bench 1 7 pancakes; diameter of the pancakes: 230 mm; 1 heating channel Drawing bench 2: 7 pancakes; diameter of the pancakes: 230 mm; 1 heating channel Drawing bench 3: 7 pancakes; diameter of the pancakes: 230 mm; 2 heating channels Drawing bench 4: 4 pancakes; diameter of the pancakes: 230 mm
• the granule is rolled for half an hour in an adhesive, such as Baysilon M 100® (trademark of the firm Bager AG), then the rest of the additives are added and mixed for an additional 1.5 hours.
• an adhesive such as Baysilon M 100® (trademark of the firm Bager AG)
• the mixture of granules consisting of polypropylene and modified polyolefin PP / PE is mixed for one hour, with a melting point> 140 ° C.
• Example 1 (reference example 1): polypropylene with MFI of 13.0 g / 10 min
• Example 2 MFI polypropylene of 6.0 g / 10 min, with a combination as an additive
• Example 3 (reference example 2): polypropylene with MFI of 12.0 g / 10 min
• Example 4 Polypropylene with MFI of 12.0 g / 10 min, with PP / PE with melting point> 140 ° C as additive
• Example 5 polypropylene with MFI of 13.0 g / 10 min, with a lubricant as an additive
• Example 6 polypropylene with MFI of 13.0 g / 10 min, with a combination based on thermal stabilizers as an additive
• Example 7 polypropylene with MFI of 13.0 g / 10 min, with a combination as an additive
• Example 8 Polypropylene with MFI of 13.0 g / 10 min, with anti-gas fading stabilization
• Example 9 MFI polypropylene of 9.0 g / 10 min, with anti-gas fading stabilization
• Fig. 3b shows photographs representing the state of the combs of a weaving loom after manufacturing 100 m, 200 m and 300 m of fabric using the monofilament according to the invention [exemplary embodiment (example 8)]. Even after manufacturing 300 m of fabric, the amount of down produced remains lower than that obtained for 100 m in the reference example.
• CM The mechanical constant CM is calculated according to the following formula: where D denotes the elongation in [%] and F denotes the resistance in [cN / tex].
• the sectional beams of 1000 m each, were manufactured using the monofilaments of
• the weaving tests are carried out on a ribbon loom.
• the crowd is formed thanks to eccentrics.
• Working mode without weft re-entry
• Comb opening: 0.175 mm thickness of teeth: 0.264 mm width of teeth: 7.0 mm Rotation speed of the loom: 1000 rpm
• the combs are photographed after an operating time of 100 m or 200 m, preferably 300 m, and they are assigned a classification.
• the monofilaments according to the invention which have a diameter> 0.050 mm, are suitable for the manufacture, without abrasion, of fabrics intended for filtration.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Artificial Filaments (AREA)
• Woven Fabrics (AREA)

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• 2002
  • 2002-12-03 ES ES02787899T patent/ES2301695T3/es not_active Expired - Lifetime
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  • 2002-12-03 PL PL02373741A patent/PL373741A1/xx not_active Application Discontinuation
  • 2002-12-03 JP JP2003549608A patent/JP2005511906A/ja active Pending
  • 2002-12-03 WO PCT/EP2002/013649 patent/WO2003048434A1/fr active IP Right Grant
  • 2002-12-03 US US10/497,408 patent/US20050067733A1/en not_active Abandoned
  • 2002-12-03 KR KR1020047008552A patent/KR100583668B1/ko not_active IP Right Cessation
  • 2002-12-03 CN CNB028243455A patent/CN1311110C/zh not_active Expired - Fee Related
  • 2002-12-03 PT PT02787899T patent/PT1453995E/pt unknown
  • 2002-12-03 AU AU2002352212A patent/AU2002352212B2/en not_active Ceased
  • 2002-12-03 EP EP02787899A patent/EP1453995B1/de not_active Expired - Lifetime
  • 2002-12-03 CA CA002468876A patent/CA2468876C/fr not_active Expired - Fee Related
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  • 2002-12-04 TW TW091135148A patent/TWI227756B/zh not_active IP Right Cessation
• 2004
  • 2004-05-18 ZA ZA200403799A patent/ZA200403799B/en unknown

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