WO2018002808A1 - Fibres polymères hydrophiles et procédé de préparation associé - Google Patents

Fibres polymères hydrophiles et procédé de préparation associé Download PDF

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Publication number
WO2018002808A1
WO2018002808A1 PCT/IB2017/053799 IB2017053799W WO2018002808A1 WO 2018002808 A1 WO2018002808 A1 WO 2018002808A1 IB 2017053799 W IB2017053799 W IB 2017053799W WO 2018002808 A1 WO2018002808 A1 WO 2018002808A1
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WO
WIPO (PCT)
Prior art keywords
fibers
range
mixture
hydrophilic polymeric
present disclosure
Prior art date
Application number
PCT/IB2017/053799
Other languages
English (en)
Inventor
Mridul MEDHI
Thaliyil Veedu Sreekumar
Nilesh Shankar REVAGADE
Suresh Bhanudas NIKAM
Vikas Kadu Bhangale
Original Assignee
Reliance Industries Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Reliance Industries Limited filed Critical Reliance Industries Limited
Publication of WO2018002808A1 publication Critical patent/WO2018002808A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0048—Fibrous materials
    • C04B20/0068—Composite fibres, e.g. fibres with a core and sheath of different material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/285—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N7/00—Flexible sheet materials not otherwise provided for, e.g. textile threads, filaments, yarns or tow, glued on macromolecular material

Definitions

  • the present disclosure relates to polymeric fibers.
  • Fibers have been used to reinforce cement concrete.
  • a few examples of reinforcing fibers are cellulose, bleached cellulose, Polyacrylonitrile (PAN) fibers, Poly-(vinyl alcohol) (PVOH) fibers, glass wool, rock wool and asbestos fibers.
  • Asbestos fibers are known for their excellent reinforcing properties and their dispersibility in wet cement. However, due to increasing health concerns they are being replaced by other safer materials.
  • An object of the present disclosure is to provide fibers having good hydrophilicity and thus good wettability.
  • Another object of the present disclosure is to provide fibers that have good reinforcing strength, and good dispersibility. Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
  • Hydrophilic polymeric fibers of the present disclosure comprise a polyester core and a sheath.
  • the sheath comprises a mixture of a polyelectrolyte and at least one base selected from a group of reagents consisting of alkali metal compounds and alkaline earth metal compounds.
  • the mixture is having viscosity in the range of 5 cP to 50 cP.
  • the polyester core can comprise at least one polyester selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly trime thy lene terephthalate (PTT), polytrime thy lene naphthalate (PTN), poly trime thy lene isophthalate (PTI), polybutylene naphthalate (PBN), polyethylene naphthalate (PEN), and vectran.
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PTT poly trime thy lene terephthalate
  • PN polytrime thy lene naphthalate
  • PTI poly trime thy lene isophthalate
  • PBN polybutylene naphthalate
  • PEN polyethylene naphthalate
  • vectran vectran
  • the polyelectrolyte can be at least one selected from the group consisting of polyacrylamide, chitosan, isinglass, guar gum, alginates and polydiallyldimethylammonium chloride (polyDADMAC).
  • the polyelectrolyte is polyacrylamide.
  • the at least one base is sodium carbonate.
  • mass ratio of the at least one polyelectrolyte to the at least one base is in the range of 1 :0.5 to 1 :5.
  • a process for preparing the hydrophilic polymeric fibers of the present disclosure comprises the following steps.
  • a predetermined quantity of at least one base is mixed in a polar fluid medium to obtain a suspension and a predetermined quantity of a polyelectrolyte is slowly added to the suspension under stirring at a predetermined speed, at a predetermined temperature, for a predetermined time, followed by cooling to obtain a mixture.
  • the mixture is applied to tows of polyester fibers.
  • the excess mixture is squeezed out, followed by curing the polyester fibers coated with the mixture for a predetermined time period to obtain the hydrophilic polymeric fibers of the present disclosure.
  • the polar fluid medium is water.
  • the predetermined temperature is in the range of 50 °C to 60 °C
  • the predetermined stirring speed is in the range of 50 rpm to 400 rpm
  • the predetermined time period in the range of 30 min to 3 hours
  • the cooling temperature is in the range of 20 °C to 35 °C.
  • the curing of the polyester fibers coated with the mixture is carried out for a time period in the range of 1 minute to 90 minutes.
  • Figure 1 illustrates a comparison between tows of hydrophilic polymeric fibers of the present disclosure (B and C) and prior art hydrophilic polyester fibers (A) in terms of their interaction with wet cement;
  • Figure 2 illustrates a comparison between the hydrophilic polymeric fibers of the present disclosure (B and C) and prior art hydrophilic polyester fibers (A) in terms of their interaction with cement, observed under an optical microscope.
  • Asbestos fibers are known for their excellent reinforcing properties and their dispersibility in cement, however they are being replaced by other fibers due to increasing health concerns that asbestos fibers pose to the workers.
  • Other fibers replacing asbestos fibers have not been found to be satisfactory in cement reinforcing applications owing to their poor wettability in the wet cement matrix and/or poor reinforcing properties. This poor wettability in wet cement is a direct result of the poor hydrophilicity of the reinforcing fibers.
  • the present disclosure envisages polymeric fibers that have good hydrophilicity and, in turn, good wettability in a wet cement matrix.
  • the fibers of the present disclosure have good reinforcing strength, good dispersibility in cement compositions, and are safe for workers.
  • hydrophilic polymeric fibers are provided. Polyester fibers, per se, do not have good hydrophilicity, thus resulting in poor dispersibility in cement compositions.
  • the present disclosure envisages hydrophilic polymeric fibers that have a polyester core, and a sheath.
  • the sheath comprises a mixture of a polyelectrolyte and at least one base selected from a group of reagents consisting of alkali metal compounds and alkaline earth metal compounds.
  • the fibers of the present disclosure have higher hydrophilicity as compared to the fibers of the prior art and hence, better dispersibility and wettability in wet cement.
  • the mixture has a viscosity in the range of 5 cP to 50 cP.
  • the mass ratio of the mixture coated on the polyester core to the total mass of the hydrophilic polymeric fibers is in the range of 0.01 wt% to 5 wt%.
  • the polyester core comprises at least one polyester selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly trime thy lene terephthalate (PTT), polytrime thy lene naphthalate (PTN), poly trime thy lene isophthalate (PTI), polybutylene naphthalate (PBN), polyethylene naphthalate (PEN), and vectran.
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PTT poly trime thy lene terephthalate
  • PN polytrime thy lene naphthalate
  • PTI poly trime thy lene isophthalate
  • PBN polybutylene naphthalate
  • PEN polyethylene naphthalate
  • vectran vectran
  • the at least one polyelectrolyte is selected from the group consisting of polyacrylamide, chitosan, isinglass, guar gum, alginates, and polydiallyldimethylammonium chloride (polyDADMAC).
  • the at least one polyelectrolyte is polyacrylamide.
  • the alkali metal and the alkaline earth metal of the at least one base is selected from the group consisting of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), francium (Fr) beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra).
  • the at least one base is sodium carbonate.
  • the mass ratio of the amount of the at least one polyelectrolyte to the at least one base is in the range of 1:0.5 to 1 :5.
  • the mass ratio of the at least one polyelectrolyte to the at least one base is 1 :2. In an embodiment, the mass ratio of the mixture to the total mass of hydrophilic polymeric fibers is in the range of 0.01 wt% to 5 wt%.
  • a process for preparing the hydrophilic polymeric fibers of the present disclosure is disclosed herein.
  • a predetermined quantity of at least one base is mixed in a polar fluid medium to obtain a suspension.
  • a predetermined quantity of at least one polyelectrolyte is slowly added to the suspension under stirring at a predetermined speed, at a predetermined temperature, for a predetermined time period, followed by cooling to obtain a mixture.
  • the mixture is applied to tows of polyester fibers.
  • the excess mixture is squeezed out, followed by curing the polyester fibers coated with the mixture for a predetermined time period to obtain the hydrophilic polymeric fibers of the present disclosure.
  • the polar fluid medium is water.
  • the predetermined temperature is in the range of 50 °C to 60 °C
  • the predetermined stirring speed is in the range of 50 rpm to 400 rpm
  • the predetermined time period is in the range of 30 min to 3 hours
  • said cooling temperature is in the range of 20 °C to 35 °C.
  • the mixture is applied by spraying on tows of polyester fibers.
  • the spraying technique comprises two sets of nozzles arranged in a way that the fiber coating formulation is sprayed on the tows of polyester fibers from above and below.
  • the amount of the fiber coating formulation applied on the tows is 0.01wt to 5wt , preferably, 0.4wt%, of the total mass of the hydrophilic polyester fibers.
  • the step of curing is carried out by passing the polyester fibers coated with the mixture, onto a relaxer for a period of 5 min to 30 min.
  • the hydrophilic polymeric fibers of the present disclosure are sent to a cutter to cut them into predetermined short lengths to obtain hydrophilic polymeric short fibers.
  • the predetermined short lengths of the hydrophilic polymeric short fibers are in the range of 0.4 mm to 190 mm.
  • the lengths of hydrophilic polymeric short fibers can be in the range of 0.4 mm to 26 mm, whereas for the other applications such as paper, carpet, and/or diapers the lengths of hydrophilic polymeric short fibers can be in the range of 0.4 mm to 190 mm.
  • the denier of the polyester fibers used in the present disclosure is in the range of 0.6D to 12D. In an embodiment, the denier of the polyester fibers used in the present disclosure is 1.5D.
  • the hydrophilic polymeric short fibers of the present disclosure are used as reinforcing agents that can be mixed with cementitious compositions for preparing concrete articles.
  • asbestos fibers are used as reinforcing agents.
  • the hydrophilic polymeric short fibers can be used to partly replace the conventional asbestos fibers as reinforcing agents.
  • the hydrophilic polymeric short fibers of the present disclosure have better affinity for wet cement as compared to the hydrophilic fibers of the prior art.
  • the polyelectrolyte coated on the polyester fibers has a resonance charge distribution in the functional group in the side chain, like, -CO-NH2 in case of poly aery lamide. This generates a charged pole in each repeating unit, especially, when the pH is greater than 7. This charged pole in the repeating units of the polyelectrolyte reacts with the cations released from the cement forming metallic bond between the metal cations and the anions in the side chains of the polyelectrolyte resulting in a certain degree of complexation.
  • the polyelectrolyte material on the surface of the polymeric fibers increases flocculation of the cement particles, which is further enhanced by the interaction of the functional groups with Ca ++ ions produced by cement hydration.
  • the polyelectrolyte coated on polyester fibers thus, forms a complex with the cement particles and binds with it. This is the reason for an increased affinity of the hydrophilic polyester fibers of the present disclosure towards wet cement. This improves the flexural strength, flexural toughness, and bond strength and abrasion resistance of the reinforced concrete structures. This also reduces the crushing ratio, permeability and contractility of the reinforced concrete.
  • the hydrophilic polymeric short fibers of the present disclosure impart high compactness to produce high strength cement concrete.
  • the hydrophilic fibers in the prior art do not possess this metallic bond with the cement particles, due to which their adherence to cement is poorer as compared to the hydrophilic polymeric fibers of the present disclosure.
  • a fiber-reinforced cementitious composition employing the hydrophilic polymeric short fibers of the present disclosure as cement reinforcements is disclosed herein.
  • the fiber-reinforced cementitious composition comprises:
  • hydrophilic polymeric short fibers in an amount in the range of 0.5% to 2% by weight of the cement
  • the cement is Portland cement.
  • the supplementary cementitious material can be at least one selected from the group consisting of natural or artificial pozzolans, fly ash, lime fillers, burnt shale, quartz dust, silica dust, ground granulated blast furnace slag, color pigments and hard ground waste.
  • fly ash and lime fillers are used as supplementary cementitious material.
  • the aggregate can comprise at least one of sand and gravel.
  • the additive when added, can be at least one selected from the group consisting of set accelerators, hardening accelerators, dispersants, fluid loss additives, gel strength modifiers, latex systems, light-weight additives, retarders, weighting agents, plasticizers, super plasticizers, water reducing agents, viscosity modifying agents, air-entraining agents, corrosion inhibitors, foaming agents, pumping agents, workability enhancing agents, shrinkage reducers, curing agents, surface improving agents and agents to control alkali-silica reaction.
  • set accelerators hardening accelerators, dispersants, fluid loss additives, gel strength modifiers, latex systems, light-weight additives, retarders, weighting agents, plasticizers, super plasticizers, water reducing agents, viscosity modifying agents, air-entraining agents, corrosion inhibitors, foaming agents, pumping agents, workability enhancing agents, shrinkage reducers, curing agents, surface improving agents and agents to control alkali-silica reaction.
  • Predetermined quantities of hydrophilic polymeric short fibers of the present disclosure and asbestos fibers are dispersed in water to obtain a dispersion.
  • the dispersion is gradually added to cement, aggregate, water, optionally at least one supplementary cementitious material and optionally at least one additive to obtain the fiber-reinforced cementitious composition.
  • the fiber-reinforced cementitious composition of the present disclosure can be used to prepare articles, typically for use in the construction industry.
  • a process for preparing an article using the fiber-reinforced cementitious composition of the present disclosure is also envisaged herein.
  • the fiber-reinforced cementitious composition of the present disclosure is molded using a mold under pressure to obtain a molded mass. The molded mass is then allowed to cure to form the article.
  • the hydrophilic polymeric short fibers of the present disclosure are used as reinforcing agents as a part replacement for asbestos fibers in the preparation of fiber cement sheets or gypsum boards.
  • the hydrophilic fibers of the present disclosure can be used as a secondary reinforcing agent in concrete. This can help in reducing early age crack formation, the number of weakened planes and the tendency for future crack formation. It also prevents micro shrinkage cracks that may get developed during hydration, making the concrete structure/concrete article inherently stronger.
  • the modulus of elasticity of such fiber reinforced concrete (FRC) is higher in comparison to the modulus of elasticity of only concrete or mortar binder. This FRC also helps in increasing the flexural strength of the concrete article.
  • hydrophilic polymeric short fibers of the present disclosure can be used as reinforcing agents for paper.
  • the polyelectrolyte on the surface of the hydrophilic polymeric short fibers increases the dispersibility of the short fibers in water.
  • the dispersing action of the polymeric short fibers helps to reduce the pulp flocculation which, in turn, improves paper formation.
  • the hydrophilic polymeric short fibers can be used in both hand-made and machine-made processes for preparing paper.
  • Na2C(3 ⁇ 4 (0.2 g) was mixed in 40 mL water contained in a vessel to form a suspension (0.5% solution).
  • Polyacrylamide (0.1 g) (Percol 2305) was slowly added in parts to the above suspension with continuous stirring at a speed of 300 rpm, at 60° C for 1 hour, and was allowed to cool over 1 hour to obtain a mixture (referred to as RTH-2C). Viscosity of this mixture was found to be 35.1 cP (using Brookfield SP# 1, at 100 rpm and 30° C).
  • This coating mixture (RTH-2C) was sprayed over a 25 g PET fiber tow. The excess mixture was squeezed out and the coated fibers were kept on a relaxer for 15 min. Thereafter, the coated fibers were taken to a cutter to cut them to short fibers which are referred to as polymeric short fibers (RTH-2C fibers).
  • 'B' illustrates RTH-2C fibers (i.e. hydrophilic polymeric short fibers of the present disclosure) whereas 'C illustrates a tow of RTH-2C fibers (i.e. hydrophilic polymeric fibers of the present disclosure). It is clearly evident from Figure 1 that 'B' and 'C are wetted by the cement composition to a very high degree as compared to ⁇ '.
  • FIG 2 ⁇ ', 'B' and 'C, also illustrate the interaction with cement of R3S fibers ( ⁇ ') and RTH-2C fibers ('B' and 'C') as observed under an optical microscope. It is clearly evident from the images that the RTH-2C fibers (of the present disclosure) show better interaction with cement as compared to commercially available hydrophilic PET fibers (R3S fibers).
  • the short fibers from Experiment 1 were taken along with asbestos fibers for reinforcing a cement slab.
  • the control cement composition (experiment 3a) used for the slab was: 54% of Ordinary Portland Cement (OPC), 35.5% of fly ash (FA), 9% of asbestos fibers (AF), and 1.5% of cellulosic pulp (CP).
  • OPC Ordinary Portland Cement
  • FA fly ash
  • AF asbestos fibers
  • CP cellulosic pulp
  • 0.5% of asbestos fibers of the control cement composition were replaced by commercially available polyester fibers (R3S fibers), PVA coated polyester fibers (RTH-1 fibers) and polymeric short fibers of the present disclosure (RTH-2C fibers) respectively.
  • RTH-1 fibers PVA coated polyester fibers
  • RTH-2C fibers polymeric short fibers of the present disclosure
  • R3S Commercially available PET fibers.
  • RTH-1 PVA coated polyester fibers.
  • RTH-2C Hydrophilic Polymeric Fiber of the present disclosure.
  • R3S Commercially available PET fibers.
  • RTH-1 PVA coated polyester fibers.
  • RTH-2C Hydrophilic Polymeric Fiber of the present disclosure.
  • the hydrophilic polymeric short fibers of the present disclosure were used as reinforcing agents in paper-making.
  • the control sample for paper making was 100% cellulosic pulp.
  • Polymeric short fibers of Experiment 1 (RTH-2C fibers) were used as a reinforcing material for paper.
  • the resultant paper was compared with the control sample and paper with R3S fibers used as reinforcing material.
  • the tensile strength of the paper prepared using RTH-2C fibers as reinforcing agents decreased in comparison with the control sample and the R3S fibers reinforced paper.
  • elongation (%) of the paper prepared using RTH-2C fibers as reinforcing agents increased considerably in comparison with elongation (%) of the control sample and the R3S fibers reinforced paper.
  • Table 3 compares the tensile strength and elongation properties of the control sample, R3S paper sample and RTH-2C paper sample. Table 3: Comparison of tensile strength and elongation of the control sample paper and the papers with R3S fibers and RTH-2C fibers as reinforcing agents
  • R3S Commercially available PET fibers.
  • RTH-1 PVA coated polyester fibers.
  • RTH-2C Hydrophilic Polymeric Fiber of the present disclosure.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Textile Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Composite Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne des fibres polymères hydrophiles. Les fibres comprennent une âme de polyester et une gaine, la gaine comprenant un mélange d'un polyélectrolyte et d'un composé de métal alcalin ou d'un composé de métal alcalino-terreux. Les fibres polymères hydrophiles selon la présente invention peuvent servir de fibres de renforcement destinées à des compositions à base de ciment et dans la fabrication du papier.
PCT/IB2017/053799 2016-06-29 2017-06-26 Fibres polymères hydrophiles et procédé de préparation associé WO2018002808A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201621022323 2016-06-29
IN201621022323 2016-06-29

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WO2018002808A1 true WO2018002808A1 (fr) 2018-01-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698331A (en) * 1995-01-25 1997-12-16 Toray Industries, Inc. Hygroscopic polyester copolymer, and a hygroscopic fiber made therefrom
US5700559A (en) * 1994-12-16 1997-12-23 Advanced Surface Technology Durable hydrophilic surface coatings
JP2009084101A (ja) * 2007-09-28 2009-04-23 Seiren Co Ltd モルタル用繊維補強材およびそれを使用したモルタル成型物
WO2012016237A2 (fr) * 2010-07-30 2012-02-02 United Resource Recovery Corporation Fonctionnalisation de surface de polyester
WO2014207760A2 (fr) * 2013-06-27 2014-12-31 Reliance Industries Limited Fibres polyester hydrophiles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5700559A (en) * 1994-12-16 1997-12-23 Advanced Surface Technology Durable hydrophilic surface coatings
US5698331A (en) * 1995-01-25 1997-12-16 Toray Industries, Inc. Hygroscopic polyester copolymer, and a hygroscopic fiber made therefrom
JP2009084101A (ja) * 2007-09-28 2009-04-23 Seiren Co Ltd モルタル用繊維補強材およびそれを使用したモルタル成型物
WO2012016237A2 (fr) * 2010-07-30 2012-02-02 United Resource Recovery Corporation Fonctionnalisation de surface de polyester
WO2014207760A2 (fr) * 2013-06-27 2014-12-31 Reliance Industries Limited Fibres polyester hydrophiles

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