WO2023006507A1 - Matériau composite - Google Patents

Matériau composite Download PDF

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Publication number
WO2023006507A1
WO2023006507A1 PCT/EP2022/070208 EP2022070208W WO2023006507A1 WO 2023006507 A1 WO2023006507 A1 WO 2023006507A1 EP 2022070208 W EP2022070208 W EP 2022070208W WO 2023006507 A1 WO2023006507 A1 WO 2023006507A1
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WO
WIPO (PCT)
Prior art keywords
composite material
organic fiber
fibers
weight
binder
Prior art date
Application number
PCT/EP2022/070208
Other languages
German (de)
English (en)
Inventor
Ewald Wilka
Original Assignee
Nabore GmbH
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 Nabore GmbH filed Critical Nabore GmbH
Publication of WO2023006507A1 publication Critical patent/WO2023006507A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B1/00—Footwear characterised by the material
    • A43B1/02—Footwear characterised by the material made of fibres or fabrics made therefrom
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/02—Uppers; Boot legs
    • A43B23/0205—Uppers; Boot legs characterised by the material
    • A43B23/0225—Composite materials, e.g. material with a matrix
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2307/00—Characterised by the use of natural rubber
    • C08J2307/02—Latex

Definitions

  • the present invention relates to a composite material containing at least one organic fiber material and at least one binder, the binder being selected from natural latex.
  • the invention relates to a method for producing a composite material and a use of the composite material.
  • composite materials are known in the prior art.
  • the composite materials are based on animal raw materials and binders. Due to the high demand for these composite materials in many areas of industry and/or everyday life, this inevitably results in an enormous amount of waste. This is problematic since the synthetic additives in particular, for example synthetic polymers, are based on petroleum and such a product consists neither of natural raw materials nor is it easily degradable.
  • animal materials in the form of fibers are also frequently used for composite materials used in the prior art.
  • consumers are increasingly turning to a vegan product, i. H. a product that is sustainable and free of animal materials.
  • a composite material according to the invention comprises a) at least one organic, vegetable, fiber material or a mixture of two or more organic, vegetable, fiber materials, with the organic, vegetable, fiber material or the mixture of two or more organic, vegetable, fiber materials being preferred a proportion of at least 40% by weight, particularly preferably at least 50% by weight, in particular at least 60% by weight, and/or at most 90% by weight, in particular at most 80% by weight, in the composite material, and b) at least one binder, wherein the binder is selected from at least one natural latex, and wherein the binder preferably has a proportion of at least 10% by weight, in particular at least 25% by weight, and/or at most 50% by weight, in particular at most 40% by weight, in the composite material.
  • composite material or “composite material” means a composite material or composite material (composite or compound for short) or a material made of two or more connected materials, which is also referred to here as a multiphase or mixed material and consists of at least two main components : from the fibers reinforcing the composite material and a binder which embeds the fibers as a filler and/or adhesive. Due to mutual interactions of the two components, the overall material can advantageously form higher-quality properties than each of the two components involved themselves.
  • a composite material can be, for example, a fiber material made from a flat structure made of fibers and binders. These are often vegetable fibers and/or animal fibers which are bonded together with the binders.
  • the composite material has different material properties than its individual components. Material properties of the components are essentially important for the properties of the composite material. In principle, any fiber material that gives the composite material the desired properties, such as a specific feel or look, is suitable as the organic fiber material.
  • organic fibrous material refers to a fibrous material, i. H. a linear, elementary structure that consists of a fibrous material and whose at least outer fiber shape essentially has a longitudinal shape and which comprises at least one organic component.
  • a fibrous material i. H. a linear, elementary structure that consists of a fibrous material and whose at least outer fiber shape essentially has a longitudinal shape and which comprises at least one organic component.
  • a treatment step for conversion into a fibrous structure can also be preferred.
  • both vegetable and animal organic fiber materials are in principle suitable for this. However, vegetable fiber material is preferred.
  • the composite material contains at least one organic, preferably vegetable, fiber material or a mixture of two or more organic, preferably vegetable, fiber materials, the organic, preferably vegetable, fiber material or the mixture of two or more organic, preferably vegetable, fiber materials preferably being a proportion of at least 40% by weight, in particular at least 50% by weight.
  • a material advantageously contains a small proportion of organic material or a high proportion of binder, as a result of which a composite material with a higher tensile strength can be obtained.
  • a composite material according to the invention contains at most 90% by weight, in particular at most 80% by weight, of the at least one organic, preferably vegetable, fiber material.
  • Such an organic, preferably vegetable, fiber material according to the invention advantageously enables a stiff material which can be used as a stiffening material for bags, for example.
  • the composite material according to the invention contains a binder.
  • binder essentially stands for the proportion of natural latex, regardless of how many components it consists of and how many different preparations it comprises.
  • Natural latex is a material that is created by tapping the sap of the rubber tree and concentrating it.
  • Natural rubber colloquially also called caoutchouc
  • rubber elasticum or resina elastica is also known as rubber elasticum or resina elastica and is a rubber-like substance in the milky sap of rubber plants, which can be obtained from renewable natural materials in an environmentally friendly way.
  • the elastic polymers of natural latex consist of polymerized isoprene units of an extremely uniform structure with an extraordinarily high molar mass (> 2 x 10 5 g/mol) and a cis-1,4 content of over 95%.
  • natural latex advantageously does not require any petroleum-based components.
  • the natural latex enables the binder or the composite material to be produced from purely natural raw materials that are not based on petroleum. It is also a raw material that is particularly durable, breathable and antibacterial.
  • the proportion of natural latex in the composite material is at least 10% by weight, in particular at least 25% by weight.
  • the proportion of natural latex in the composite material is at most 50% by weight, in particular at most 40% by weight.
  • Such a proportion of natural latex gives the composite material softness and durability. This advantageously ensures that the softness is constant both at low temperatures (for example at temperatures below freezing point ( ⁇ 20° C.)) and at high temperatures (for example at over 50° C.). i.e. the softness of the composite material is independent of temperature. Due to the durability as well as the longevity of the raw material, a stable and durable composite material is also provided.
  • the proportion of natural latex advantageously contributes to the fact that the product can be easily deformed and is therefore very flexible, which is a great advantage due to the versatile use of composite materials.
  • the present invention makes it possible to use only one binder, namely only natural latex, so that the use of further components can advantageously be dispensed with.
  • biopolymer is understood to mean a polymer which is essentially of biological origin and whose proportion of synthetic components is no more than 20% by weight, preferably no more than 10% by weight.
  • biopolymer does not exclude that the biopolymer can also go through processes for its preparation and purification.
  • a small proportion of a synthetic polymer and/or a synthetic latex in the binder is not excluded, such a proportion being up to 20% by weight, preferably up to 15% by weight, of the total proportion of the binder can lie.
  • the present invention comprises a method for producing a composite material with the following steps: i) providing an organic, vegetable, fibrous material or a mixture of two or more organic, vegetable, fibrous materials, ii) defibering the organic, vegetable, fibrous material or the mixture of two or more organic, vegetable, fiber materials, iii) subsequent mixing of the components from step ii) with a binder to obtain a dispersion, wherein the binder is selected from at least one natural latex, iv) optional addition of at least one biopolymer and/or a synthetic polymer, v) optionally adding an aqueous solution of an aluminum and/or a copper salt or an organic acid (formic acid or acetic acid) to the dispersion from step iii) or optionally from step iv), vi) optionally dewatering the mixture Step v), vii) optionally drying the mixture Step v) or vi).
  • an organic, vegetable, fiber material or a mixture of two or more organic, vegetable, fiber materials can in principle be carried out in such a way that this is obtained as a correspondingly manufactured material or is also self-made.
  • both animal and vegetable fiber materials can be used in the process according to the invention.
  • a preferred method uses vegetable fiber material, the vegetable fiber material in particular used and/or recycled vegetable fiber material.
  • the finishing of the plant fibers includes work steps that shape the surface appearance of the composite material and can influence its surface properties. In most cases, the finishing involves the color design of the surface coloring, but also impregnation, wax finishing or mechanical processing steps such as ironing or embossing of the organic fiber material.
  • the preparation describes previous work steps in the intended production sites.
  • the organic vegetable fiber material is defibrated.
  • Such defibering can be done either dry or wet depending on the desired product. In the case of soft, little woody vegetable fiber materials, the defibering is preferably carried out dry.
  • the fiber material is defibrated using a mill, for example a baffle plate mill.
  • a mill for example a baffle plate mill.
  • Such dry defibration advantageously enables a soft composite material to be produced.
  • such a method enables the composite material to be produced with only little water consumption.
  • the fiberized material is then soaked in an aqueous solution or liquid, for example in a ratio of 5% fiber material and 95% water, preferably 4% by weight fiber material and 96% by weight water.
  • the preferably animal fiber material is first dry comminuted to a preferred fiber length of approx Ratio of 5% fiber material and 95% water, preferably 4% by weight fiber material and 96% by weight water). Such a wet defibration can take place, for example, by means of disc refiners. These harder plant fiber materials result in a slightly harder composite material.
  • the softness or strength of the composite material can be adjusted individually. This depends on the mixing ratio between the dry and the wet fiber material.
  • the use of 100% dry fiber material advantageously results in a very soft product, which can be used for handbag, shoe or clothing material, but also in the Automotive industry can be used.
  • the use of 100% wet fiber material results in a very strong product, which is used, for example, for shoe soles, inside walls of bags, wall coverings.
  • a vegetable fiber material it is advantageously provided with a cationic, low molecular weight polymer and/or a quaternary ammonium compound (pH preferably 4 to 7) after the defibration.
  • the zeta potential is advantageously set in such a way that the organic fiber material is present in a neutral or slightly cationic form, but not anionic.
  • the zeta potential is the electrical potential at the shear layer of a moving particle in a suspension.
  • the proportion of the cationic polymer or the quaternary ammonium compound in the finished end product, i. H. in the dewatered or dried composite material, is advantageously less than 1% by weight, preferably less than 0.5% by weight.
  • a compound can be selected, for example, from a quaternary polyalkylamine and is commercially available under the name Chupafloc LP 221 (Chupa Textilchemie GmbH, Wertingen, Germany).
  • the binder for the production of the composite material is selected from a natural latex.
  • the natural latex is preferably added to the organic, vegetable, fiber material in a form low in ammonia.
  • An aqueous solution of inorganic aluminum and/or copper salt can then optionally be added to the mixture or dispersion.
  • Aluminum sulfate is preferably used for this.
  • an organic acid such as for example formic acid or acetic acid can be used.
  • the inorganic salts or organic acids are used to precipitate the binder.
  • most of the metal salt is removed from the composite material with the aqueous phase, but a small amount can remain in the composite material.
  • no metal salts remain in the material or waste water when using organic acids.
  • the mixture can be dewatered and dried.
  • the amounts of the organic, preferably vegetable, fiber material or the binder are provided in such a way that, after production of the composite material according to the invention, they preferably result in a proportion as already explained above.
  • the present invention relates to a composite material, the composite material being obtainable by the production method described above.
  • the present invention relates to a method for surface coating an article, wherein a composite material according to the invention and an article are heated to a temperature above the yield point of the composite material, the composite material is applied to the article, and the article and the composite material are then applied to a Temperature are cooled below the yield point of the composite material.
  • the present invention relates to the use of the composite material according to the invention, preferably for profile wrapping of wall, floor and ceiling panels, for surface coating of furniture fronts with or without inner radii, for edge gluing, in particular for surface coating of parts in the interior of motor-driven motor vehicles, for the production of aircraft seats or Inner linings, in particular for the manufacture of textiles for clothing, shoes and bags.
  • the soft composite material whose production process has already been explained, is used for the production of textiles for clothing, shoes and bags, for example.
  • the solid composite material (whose manufacturing process was also explained above) is preferably used for more solid products, such as shoe soles, inside walls of bags (reinforcing material), wall coverings.
  • the soft product Due to its elasticity, the soft product can also be pulled over three-dimensional surfaces and can thus be subjected to contour-accurate moulding, for example, which remains dimensionally stable when glued to a carrier. Due to the fact that this product is advantageously not thermoplastic due to the use of natural latex, such deformations are not dependent on temperature and can be deformed without paying attention to the deformation temperature.
  • a composite material according to the invention can be applied to various carrier materials as a decorative strip surface or in the form of various applications, as a result of which a very lively appearance or an individual design of the interior of motor-driven motor vehicles can be obtained.
  • the composite material can also be bonded to a lining and/or outer material such as a nonwoven fabric.
  • a nonwoven fabric such as a nonwoven fabric.
  • an advantageous composite material contains vegetable fibers.
  • the organic fiber material can be made from purely vegan, renewable raw materials. Plant fibers are particularly sustainable raw materials in this case. This is all the more true if they occur as residues in a production process.
  • an advantageous composite material comprises a proportion of more than 50% by weight, preferably at least 70% by weight, preferably a proportion of at least 80% by weight, particularly preferably a proportion of at least 90% by weight, in particular preferably a proportion of at least 95% by weight, most preferably at least 99% by weight, of natural components, ie of plant and/or animal components, particularly preferably of vegan components, ie of components of non-animal origin.
  • Preferred plant fibers are fibers from pineapple, banana, cotton, kapok, jute, kenaf, ramie, manila, coconut, sisal, bast residues from lime and/or oak, nettle, flax fibers and/or hemp fibers, particularly preferably from pineapple, banana, cotton , bast residues from linden and/or oak, fiber nettle, flax fibers and/or hemp fibers, in particular from pineapple, banana, cotton, flax fibers and/or hemp fibers, particularly preferably from hemp fibers.
  • the plant fibers can be obtained from any type of plant or plant residues.
  • Such an approach ultimately also enables the selection of regional raw materials, such as e.g. B. hemp fibers in order to have a lasting positive influence on the CO2 footprint.
  • the organic fiber material is preferably comminuted to a stretched length of about 0.1 to 15 mm, preferably about 0.1 to 8 mm, for example by means of a cutting mill.
  • the fiber length is preferably at least about 0.5 mm, particularly preferably at least about 1 mm, in particular at least about 3 mm.
  • a preferred fiber length is at most up to about 15 mm, particularly preferably up to about 10 mm, in particular up to about 8 mm.
  • the fiber length is measured in the stretched state of the fiber; Depending on the starting material and the type of comminution, it can happen that the fiber assumes an irregular shape, for example a curved shape, without external influence.
  • plastic fibers animal fibers and/or used and/or recycled fabric fibers, more preferably animal fibers and/or used and/or recycled fabric fibers, especially used and/or recycled fabric fibers.
  • Such used and/or recycled fabric fibers advantageously contain at least 80% by weight of vegetable fibers such as cotton.
  • used stands for "used” or “no longer unused” or “second-hand”.
  • Such used material can also include waste material and/or possibly show signs of wear and tear and can, but does not necessarily have to, be functional.
  • a used material is a composite material that has already been put to its normal use by the manufacturer, seller or a third party and may have a material defect. It can also be about rejected goods or leftover goods that should not be sold in this way. This can also be goods that occur, for example, as waste from a production process.
  • waste means that a raw material is reused, reused or remanufactured.
  • waste can be classified as waste. This means that waste is processed through various recovery processes into products, materials or substances, either for the original purpose or for other purposes. Irrespective of their original purpose, the products, materials or substances are used here for the purpose of producing a composite material according to the invention.
  • Suitable plastic fibers can be selected from polymers such as cupro, viscose, modal, acetate, triacetate or alginate fibers and protein fibers or mixtures of two or more of the fibers mentioned.
  • suitable synthetic polymer fibers polyacrylic, polymethacrylic, polyvinyl chloride, fluorine-containing polymer fibers, polyethylene, polypropylene, vinyl acetate, polyacrylonitrile, polyamide, polyester or polyurethane fibers can be mentioned.
  • Suitable animal fibers include natural fibers such as wool, hair, or silk; used and/or recycled fabric fibers can be obtained, for example, from felt fabric, cork fabric, linen fabric, paper fabric, velvet fabric, jersey fabric, leather fabric and/or denim and the like.
  • the preferred used and/or recycled fabric fibers that occur in textile production, for example denim, are particularly advantageous here.
  • a method of making a composite material uses post-consumer and/or recycled fabric fibers, post-consumer and/or recycled plastic fibers, and/or post-consumer and/or recycled animal fibers.
  • the composite material according to the invention comprises at least one binder made from a natural latex.
  • the polymer units of the natural latex preferably have a molecular mass of at least about 250,000 Da, preferably about 500,000 Da, preferably at least about 1,000,000 Da, in particular at least about 1,500,000 Da.
  • a preferred molecular mass of the polymer units of the natural latex is at most about 10,000,000 Da, particularly preferably at most about 5,000,000 Da, in particular at most about 3,000,000 Da, particularly preferably at most about 2,500,000 Da, most preferably at at most about 2,000,000 Da.
  • the determination of the molecular mass of polymers is known in principle to those skilled in the art and can be determined, for example, by gel permeation chromatography (GPC).
  • a binder can contain other binders in addition to the advantageous natural latex.
  • Biopolymers, synthetic polymers and/or synthetic latexes are preferably used for this purpose.
  • further binders are used in addition to the natural latex, the biopolymers, the synthetic polymers and/or the synthetic latex preferably have a proportion of at most 50% by weight of the total proportion of the binder.
  • the polymer units of such a polymer preferably have a minimum film forming temperature (MFT) of at most 5°C, in particular at most 0°C.
  • MFT minimum film forming temperature
  • a polymer with such a minimum film-forming temperature advantageously gives the composite material optimal elastic properties and high resistance to breakage.
  • the term minimum film-forming temperature means the lowest temperature at which a thin layer of a polymer dispersion still dries to form a coherent film. It is close to the glass transition temperature T g of the polymer and, with film formation, determines one of the most important performance properties of a polymer dispersion.
  • a method for determining the minimum film-forming temperature is known to those skilled in the art and can be carried out according to DIN 53787, for example.
  • a preferred method for producing such a composite material therefore takes into account the addition of one or more biopolymers, synthetic polymers and/or synthetic latexes in addition to the steps already mentioned above.
  • a more preferred composite material can contain up to 20% by weight, preferably up to 10% by weight, particularly preferably up to 5% by weight, particularly up to 2.5% by weight, particularly preferably up to 1% by weight %, one or more components from the group consisting of inorganic salts, preservatives, dyes, natural and/or synthetic fats, paraffins, natural and/or synthetic oils, silicone oils, ionic and/or nonionic surfactants.
  • the proportion mentioned refers to the end product of the composite material, i. H. onto the dewatered or dried composite material.
  • moldable components such as moldable shoe components such as heel caps and/or toe caps, casing of objects, for example casing of boxes, perfume containers and the like, leather linings of containers and caskets, etc. be used.
  • the advantageous composite material comprises a thermally activatable adhesive, preferably a hot-melt adhesive.
  • a thermally activatable adhesive or preferred hot-melt adhesive After activation at a temperature at which the adhesive or hot-melt adhesive softens or changes to the liquid state, such a thermally activatable adhesive or preferred hot-melt adhesive forms a firm connection with the organic fiber material and is permanently bonded to it over the entire surface . Subsequent cooling solidifies the adhesive and remains firmly connected to the organic fiber material even under high mechanical stress.
  • hot melt adhesive also called hot melt adhesive, hot melt or hot glue
  • hot melt adhesive is understood to mean a generally solvent-free substance that is more or less solid at room temperature, which liquefies when heated at its melting point and when it cools down a solid compound, in the present case Case with the organic fibers and optionally other substances that are in the advantageous composite material forms.
  • This group of adhesives is based on different chemical raw materials.
  • the melting temperature of such a hot-melt adhesive is preferably within the thermal deformation temperature of the composite material.
  • the thermally activatable adhesive or the preferred hot-melt adhesive can be the binder itself, i. H. the natural latex and possibly other optional binders.
  • the thermally activatable adhesive or the hot-melt adhesive can also be selected from a different substance.
  • Such an alternative substance can be selected, for example, from the group of polyamide, polyethylene, polyalphaolefin, ethylene vinyl acetate copolymers, polyester elastomers, copolyamide elastomers, vinyl pyrrolidone/vinyl acetate copolymers and the like.
  • the inventive vegan composite material For the production of the inventive vegan composite material are dry vegetable fibers such as B. hemp, sisal, Unters, cotton used. If the fiber length is more than 10 mm, the fibers are comminuted dry in so-called cutting knife mills (mills with rotating and static knives) to a fiber length of less than 10 mm. A sieve with 1 cm 2 m perforation is used for this purpose, which is inserted in the cutting blade mill and only ejects fibers that are smaller than 10 mm.
  • cutting knife mills mills with rotating and static knives
  • crimped fibers In the case of crimped fibers, these are no longer treated, but soaked in water and a so-called pulp is produced (suspension of fibers in water).
  • the smooth, uncrimped fibers are again defibrated dry, specifically in so-called impact disk mills (e.g. REF 8, Pallmann, Zweimaschinen, Germany) in order to achieve crimping.
  • impact disk mills e.g. REF 8, Pallmann, Zweimaschinen, Germany
  • Such a shredded material is advantageously used for the manufacture of, for example, bag material.
  • a pulp is then also produced from these fibers.
  • these fibers must also be pre-shredded to a length of 10 mm and then wet defibrated using disc refiners (e.g. Asplund disc refiner, Valmet, Darmstadt, Germany).
  • disc refiners e.g. Asplund disc refiner, Valmet, Darmstadt, Germany.
  • Such a material can advantageously be used as a stiffening material, for example for shoe soles or bag inner material.
  • a binder e.g. aluminum sulphate solution, Ecolochem, 7-10% ig, pH ⁇ 7
  • the zeta potential is preferably adjusted to neutral or cationic with the aid of a quaternary ammonium compound (e.g. Chupafloc LP 221, from CHUPA) in order to be able to fix the anionic binder better.
  • a quaternary ammonium compound e.g. Chupafloc LP 221, from CHUPA
  • Natural latex is added as a binder. In this way, a completely natural product with a soft, supple material can be achieved.
  • a biopolymer can optionally be added.
  • one or more synthetic, thermoplastic binders such as styrene butadiene rubber: SBR; acrylates, styrene acrylates, nitrile butadiene rubber: NBR, polyurethanes, etc.
  • SBR styrene butadiene rubber
  • NBR acrylates, styrene acrylates, nitrile butadiene rubber
  • polyurethanes etc.
  • these must be anionic and coagulable.
  • the pulp obtained in this way is then drained with a fourdrinier machine (e.g. from Corsini or Bellmer), dried in a drying tunnel (e.g. from Dornier) with the supply of warm air, calendered in a rolling mill and ground (e.g. from Aletti , Varese), and further refined.
  • the refinement can be done, for example, by embossing on the surface and finishing with color.
  • denim or other textiles containing at least 80% vegetable fibers are shredded, freed from metals and then in so-called cutting blade mills (mills with rotating and static knives) to a fiber length analogous to example 1 crushed under 10 mm.
  • the fibers are then mixed with water and wet defibered with disc refiners.
  • a cationic product e.g. aluminum sulphate solution from Ecolochem, 7-10%, pH ⁇ 7
  • the zeta potential is preferably adjusted to neutral or cationic with the aid of a quaternary ammonium compound (e.g. Chupafloc LP 221, from CHUPA) in order to be able to fix the anionic binder better.
  • a quaternary ammonium compound e.g. Chupafloc LP 221, from CHUPA
  • Natural latex is added as a binder. In this way, a completely natural product with a soft, supple material can be achieved.
  • a biopolymer can optionally be added.
  • one or more synthetic, thermoplastic binders such as SBR; acrylates, styrene acrylates, NBR, polyurethanes, etc.
  • a preferred proportion of up to 30% by weight, particularly preferably of up to 15% by weight (of the end product) must be added, whereby this must be anionic (pH 6 to 8) and coagulable.
  • the pulp obtained in this way is then dewatered with a fourdrinier machine (Corsini), dried in a drying tunnel (Dornier) with the supply of warm air, calendered in a rolling mill (e.g. Aletti, Varese), ground and further refined.
  • the refinement can be done, for example, by embossing on the surface and finishing with color.

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
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  • Medicinal Chemistry (AREA)
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Abstract

La présente invention concerne un matériau composite contenant au moins un matériau fibreux organique et au moins un liant, le liant étant choisi parmi au moins un latex de caoutchouc naturel. L'invention concerne en outre un procédé de fabrication d'un matériau composite et une utilisation du matériau composite.
PCT/EP2022/070208 2021-07-29 2022-07-19 Matériau composite WO2023006507A1 (fr)

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DE102021119798.8 2021-07-29
DE102021119798.8A DE102021119798A1 (de) 2021-07-29 2021-07-29 Verbundmaterial

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WO2005017004A1 (fr) * 2003-08-08 2005-02-24 Ledertech Gmbh Matiere composite pour realiser des parties de chaussure thermoformables a base de fibres organiques

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US20070184742A1 (en) 2005-10-20 2007-08-09 Sustainable Solutions, Inc., (SSI) Corp. of Delaware Composite leather material
DE102019109954A1 (de) 2019-04-15 2020-10-15 S.M.B.-Equity GmbH Thermoplastisches Verbundmaterial

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