EP3927878A1 - Composition de liant sans formaldéhyde - Google Patents

Composition de liant sans formaldéhyde

Info

Publication number
EP3927878A1
EP3927878A1 EP20704003.1A EP20704003A EP3927878A1 EP 3927878 A1 EP3927878 A1 EP 3927878A1 EP 20704003 A EP20704003 A EP 20704003A EP 3927878 A1 EP3927878 A1 EP 3927878A1
Authority
EP
European Patent Office
Prior art keywords
weight
binder composition
aqueous binder
copolymerized
comonomers
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.)
Pending
Application number
EP20704003.1A
Other languages
German (de)
English (en)
Inventor
Heimo WÖLFLE
Florian Bauers
Holger Poths
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Chemie AG
Original Assignee
Wacker Chemie AG
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 Wacker Chemie AG filed Critical Wacker Chemie AG
Publication of EP3927878A1 publication Critical patent/EP3927878A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
    • C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
    • C09J131/04—Homopolymers or copolymers of vinyl acetate
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/641—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions characterised by the chemical composition of the bonding agent
    • 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
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
    • C08F218/02—Esters of monocarboxylic acids
    • C08F218/04—Vinyl esters
    • C08F218/08—Vinyl acetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/40—Redox systems
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
    • C08L31/02—Homopolymers or copolymers of esters of monocarboxylic acids
    • C08L31/04—Homopolymers or copolymers of vinyl acetate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
    • C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
    • C09D131/04—Homopolymers or copolymers of vinyl acetate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/587—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • 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
    • D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
    • 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
    • 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
    • D06M15/327—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof
    • D06M15/333—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof of vinyl acetate; Polyvinylalcohol
    • 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
    • D06M17/00—Producing multi-layer textile fabrics
    • D06M17/04—Producing multi-layer textile fabrics by applying synthetic resins as adhesives
    • D06M17/06—Polymers of vinyl compounds

Definitions

  • the invention relates to a formaldehyde-free binder composition and its use for the production of textile fabrics.
  • Binder compositions for textile fabrics generally contain polymers based on ethylenically unsaturated monomers as binder components and are mostly in the form of an aqueous dispersion.
  • the polymers usually contain units of crosslinking monomers and can therefore network with one another and optionally also with fibers and thus contribute to the formation of textile fabrics with higher strength. As a result, permanent fixation of the fibers and an increase in the resistance of the textile fabrics to mechanical loads can be achieved.
  • Textile fabrics are also known by the term nonwovens and can be produced, for example, by the airlay, wetlay or spunlay process.
  • NMA N-methylolacrylamide units
  • N-methylolacrylamide groups can interact with the OH groups of cellulose or starch and consequently lead to covalent bonds between the binder polymer and the fiber.
  • formaldehyde is formed in the course of the crosslinking of such polymers, which should be avoided for toxicological reasons.
  • such polymers contain formaldehyde as an accompanying substance in many cases, for example in the production by means of polymerization using formaldehyde-releasing initiators, such as sodium formaldehyde sulfoxylate.
  • WO 2013/085764 A1 describes a fiber binder based on a vinyl acetate-ethylene copolymer dispersion stabilized with polyvinyl alcohol which does not contain N-methylolacrylamide and which contains ammonium chloride to improve the wet strength of the binder.
  • EP 0609 849 A1 describes a nonwoven in the form of an aqueous, emulsifier-stabilized dispersion of a vinyl acetate-ethylene copolymer with N-butoxymethyl, acrylamide and acrylamide monomer units.
  • EP 0184 153 B1 describes formaldehyde-free latex binders stabilized with anionic emulsifier and based on acrylic acid ester copolymers with acrylamide and dicarboxylic acid monomer units.
  • JP 2008-297523 A describes adhesives based on vinyl acetate-ethylene copolymers stabilized with polyvinyl alcohol which still contain comonomer units which are derived from acrylamide and acrylic acid.
  • the invention was based on the object of providing an aqueous binder for fiber binding which, even without the addition of crosslinking catalyst, leads to high wet strength of the fiber composite without releasing formaldehyde.
  • the invention relates to an aqueous binder composition for fiber binding, obtainable by means of free-radically initiated polymerization of vinyl acetate and ethylene, in the presence of polyvinyl alcohol in an aqueous medium, characterized in that a) 50 to 94% by weight of vinyl acetate, b) 5 to 40% by weight of ethylene, c) 0.2 to 5% by weight of acrylamide and / or methacrylamide, d) 0.2 to 5% by weight of maleic anhydride and / or maleic acid, in the presence of a polyvinyl alcohol with a degree of hydrolysis from 80 to 99 mol% are copolymerized, the data in% by weight in each case being based on the total weight of the comonomers and in each case adding up to 100% by weight.
  • b) 15 to 28% by weight of ethylene, based on the total weight of the comonomers, are copolymerized.
  • c) from 0.5 to 2% by weight, particularly preferably from 0.7 to 1.2% by weight, of acrylamide and / or methacrylamide, based in each case on the total weight of the comonomers, are copolymerized. Only acrylamide is preferably copolymerized as comonomer c).
  • comonomer e Preferably d) 0.2 to 3 wt.%, Particularly preferably 0.4 to 1.5 wt.%
  • Maleic anhydride and / or maleic acid are copolymerized.
  • Preferably, only maleic anhydride is copolymerized as comonomer e).
  • the monomers c) and d) can be completely or partially replaced with maleic acid.
  • maleic acid Preferably no acrylic acid and / or methacrylic acid are copolymerized.
  • the polymers are obtainable by means of free-radically initiated polymerization.
  • the polymers can be prepared in a manner known per se, for example by the suspension polymerisation process or, preferably, by the emulsion polymerisation process in water.
  • the polymerization temperature is generally from 20 ° C. to 120 ° C. and the work is carried out under pressure, generally between 5 bar and 100 bar.
  • the polymerization can be initiated with the water-soluble or monomer-soluble initiators or redox initiator combinations customary for emulsion polymerization or suspension polymerization.
  • Ascorbic acid, isoascorbic acid or their salts or formaldehyde-free reducing agents such as Bruggolite FF6 are preferred as reducing agents.
  • Persulfate compounds and peroxide compounds are preferred as oxidizing agents, in particular ammonium or alkali persulfates or hydrogen peroxide.
  • the initiators used are preferably no formaldehyde-releasing substances, such as formaldehyde sulfoxylates.
  • the polymerization takes place in the presence of preferably 1 to 10% by weight, based on the total weight of the comonomers, of one or more polyvinyl alcohols with a degree of hydrolysis of 80 to 99 mol%, preferably 85 to 90 mol%, particularly preferably 87 up to 89 mol%.
  • the Höppler viscosity in a 4% aqueous solution of the polyvinyl alcohols is generally from 2 to 40 mPas, preferably from 2 to 15 mPas (Höppler method at 20 ° C., DIN 53015).
  • the polyvinyl alcohols mentioned are commercially available and accessible by methods known to the person skilled in the art.
  • emulsifiers can also be used in the polymerization, for example 0.1 to 2.0% by weight, based on the total weight of the comonomers re. Preferably, no emulsifiers are used during the polymerization.
  • the aqueous dispersions generally have a pest content of 40 to 60% by weight and preferably 45 to 55% by weight.
  • the Brookfield viscosity of the aqueous dispersions is preferably 50 to 2000 mPas, particularly preferably 100 to 1500 mPas (determined with a Brookfield viscometer at 23 ° C. at 20 rpm with a solids content of the dispersions of 49 to 51 wt. -%).
  • the binder compositions can also contain one or more additives, for example emulsifiers, such as fatty alcohol ethoxylates with low degrees of ethoxylation, in particular 2 to 5, or di-isotridecyl sulfosuccinate or salts thereof, such as sodium salts.
  • emulsifiers such as fatty alcohol ethoxylates with low degrees of ethoxylation, in particular 2 to 5, or di-isotridecyl sulfosuccinate or salts thereof, such as sodium salts.
  • emulsifiers are, based on the dry weight of the polymer, from 0 to 1% by weight, preferably from 0 to 0.6% by weight. With emulsifiers, the hydrophilicity of textile fabrics treated with such binder compositions can be increased.
  • Other additives are acidic catalysts such as ammonium chloride, citric acid or sulfuric acid.
  • Acid catalysts are usually added in amounts of 0 to 2% by weight, preferably 0.1 to 1% by weight, based on the dry weight of the polymer. If the acidic catalysts are Brönstedt acids, so much of these is used that a pH of preferably 0 to 4 and particularly preferably 2 to 3 results. Most preferably, no catalysts are used in the aqueous binder composition.
  • the use according to the invention for producing the flat textile structures is generally carried out by bringing fibers into contact with one or more aqueous binder compositions according to the invention and then drying them.
  • the drying is preferably carried out at temperatures of ⁇ 160.degree. C., particularly preferably 120 to 160.degree. C. and most preferably 140 to 160.degree.
  • the fibers are generally based on natural or synthetic, especially organic, materials. Examples here are synthetic fibers based on fiber-forming polymers such as viscose, polyester, polyamide, polypropylene, polyethylene fibers. Examples of natural fiber materials are wood, wool, cotton, jute, flax, hemp, coconut, ramie, sisal fibers and, in particular, cellulose fibers.
  • the fibers can be used loosely or in the form of bundles or woven textiles, yarns or preferably in the form of nonwovens, such as fleeces, scrims or knitted fabrics.
  • the nonwovens can optionally be thermally or mechanically pre-consolidated, for example needled.
  • the fibers can have any length, preferably 5 mm to 100 mm, particularly preferably 7 mm to 75 mm and most preferably 10 mm to 60 mm.
  • the fibers can have the usual diameters, preferably diameters of 0.1 ⁇ m to 1 mm, particularly preferably 0.5 ⁇ m to 100 ⁇ m and most preferably 1 ⁇ m to 50 ⁇ m.
  • the aqueous binder composition is used in an amount of preferably 1 to 50% by weight, particularly preferably 10 to 30% by weight and most preferably 15 to 25% by weight, based in each case on the total weight of the fibers.
  • the proportion of fibers is preferably 40 to 99% by weight, particularly preferably 60 to 90% by weight and most preferably 70 to 80% by weight, based in each case on the total weight of the textile fabrics.
  • the procedure can be such that the fibers are spread out flat before solidification.
  • the methods for this are known and primarily depend on the application in which the solidified fiber material goes.
  • the fibers can, for example, by means of an air-laid, wet-laid, direct-spinning or carding device. If necessary, mechanical consolidation can also be carried out prior to consolidation with binding agent, for example by cross-laying, needling or water jet consolidation.
  • the binder composition can then be applied to the laid-out fibers, it being possible for the binder composition to be applied in planar, punctiform or pattern-like fashion.
  • the fibers can then be bound by applying temperature and, if necessary, pressure.
  • the aqueous binder composition is also suitable for the production of laminates, two fiber layers being glued together or one fiber layer being glued to another substrate.
  • the procedure can be that one fiber layer is laid out, the binder composition being applied after laying out, and another fiber layer being laid on, for example by air laying.
  • another substrate for example a plastic film, can also be placed on top.
  • the bond then takes place by applying temperature and, if necessary, pressure.
  • insulation materials made of shredded cotton are accessible, which are permanently laminated with a fiber fleece as a cover fleece.
  • the binder compositions are also suitable for the manufacture of voluminous nonwovens or wadding which are used, for example, as semi-finished products for the production of molded parts from fiber materials or as padding, insulating and filter wadding.
  • the binder compositions can be applied to the fibers and solidified by increasing the temperature, preferably in a molding tool.
  • the textile fabrics produced according to the invention are preferably nonwovens, in particular tissues, felts, wadding or coarse-meshed, loose fabrics, knits or knitted fabrics.
  • the textile fabrics can be for example in the automotive sector, for household products such as tablecloths, hygiene articles such as toilet paper, in the clothing industry, for medical textiles or geotextiles.
  • Aqueous dispersions of vinyl acetate-ethylene copolymer dispersions with a solids content of approx. 55% were prepared for testing.
  • the production was carried out by means of emulsion polymerization of 76 to 78% by weight of vinyl acetate, 21 to 22% by weight of ethylene and the amounts in% by weight of acrylamide (AA), acrylic acid (AS), maleic anhydride (MSA) given in Table 1 and N-methylol acrylamide (NMA).
  • AA acrylamide
  • AS acrylic acid
  • MSA maleic anhydride
  • NMA N-methylol acrylamide
  • the polymerization was carried out in each case in a pressure reactor at a temperature range from 40 to 75 ° C. and at a pressure of up to 85 bar.
  • Examples 1 and 2 show that with the binder composition according to the invention high wet tensile strengths are obtained, even without the addition of a catalyst.
  • NMA-containing binder compositions such as that of Comparative Example 4
  • lower values are obtained, with the additional disadvantage of the release of formaldehyde.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Nonwoven Fabrics (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne une composition aqueuse de liant pour la liaison de fibres, pouvant être obtenue au moyen d'une polymérisation amorcée par des radicaux libres d'acétate de vinyle et d'éthylène, en présence d'alcool polyvinylique dans un milieu aqueux, caractérisée en ce que a) 50 % à 94 % en poids d'acétate de vinyle, b) 5 % à 40 % en poids d'éthylène, c) 0,2 % à 5 % en poids d'acrylamide et/ou de méthacrylamide et d) 0,2 % à 5 % en poids d'anhydride maléique et/ou d'acide maléique sont copolymérisés en présence d'un alcool polyvinylique ayant un taux d'hydrolyse de 80 à 99 % en moles, les nombres en % en poids étant chacun basés sur le poids total des comonomères et, dans chaque cas, totalisant 100 % en poids.
EP20704003.1A 2020-02-06 2020-02-06 Composition de liant sans formaldéhyde Pending EP3927878A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/052993 WO2021155932A1 (fr) 2020-02-06 2020-02-06 Composition de liant sans formaldéhyde

Publications (1)

Publication Number Publication Date
EP3927878A1 true EP3927878A1 (fr) 2021-12-29

Family

ID=69500753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20704003.1A Pending EP3927878A1 (fr) 2020-02-06 2020-02-06 Composition de liant sans formaldéhyde

Country Status (4)

Country Link
US (1) US20220220646A1 (fr)
EP (1) EP3927878A1 (fr)
CN (1) CN113811584B (fr)
WO (1) WO2021155932A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023131402A1 (fr) * 2022-01-05 2023-07-13 Wacker Chemie Ag Composition stabilisée réticulable pour substrat non tissé et son procédé de préparation

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US4339552A (en) * 1978-09-18 1982-07-13 National Starch & Chemical Corporation Vinyl ester aqueous adhesive emulsions including acrylamide
US4449978A (en) * 1981-08-31 1984-05-22 Air Products And Chemicals, Inc. Nonwoven products having low residual free formaldehyde content
CA1279744C (fr) 1984-12-03 1991-01-29 Pravinchandra K. Shah Latex sans formaldehyde, et tissus faits dudit latex
US5087487A (en) * 1989-07-10 1992-02-11 National Starch And Chemical Investment Holding Corporation Non-thermoplastic binder for use in processing textile articles
EP0596318B1 (fr) 1992-11-04 1998-09-16 National Starch and Chemical Investment Holding Corporation Liants en émulsion à faible teneur en formaldehyde résiduel et ayant une ténacité améliorée
EP0609849A1 (fr) 1993-02-02 1994-08-10 Vinamul Ltd. Composition liante
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