Classifications

• • A—HUMAN NECESSITIES
  • A43—FOOTWEAR
  • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
  • A43B1/00—Footwear characterised by the material
  • A43B1/0063—Footwear characterised by the material made at least partially of material that can be recycled
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K11/00—Use of ingredients of unknown constitution, e.g. undefined reaction products
  • C08K11/005—Waste materials, e.g. treated or untreated sewage sludge
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
  • Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear

Definitions

• the present invention relates to a filler mixture for the production of thermoplastic stiffening materials for the footwear industry, primarily of front and rear caps
• the powder mixture consists of a bioplastic and a specially selected, renewable natural substance.
• shoe stiffening materials with the inventive filler mixture can be done both on a double belt plant, as well as by extrusion, in particular by coextrusion.
• EP 183 912 B2 describes shoe stiffening materials which can already be bonded directly to the shoe leather without additional adhesive.
• hot melt adhesive polycaprolactone types which were particularly suitable due to their low melting point of about 60 ° C.
• the fillers used were plastic powders or plastic-encapsulated organic or inorganic powders which did not dissolve in the hot-melt adhesive. Depending on the requirements, these materials were provided on one or both sides with a carrier material.
• the ratio of hot melt adhesive to filler had to be 50-95 wt .-% to 50-5 wt% filler.
• the fillers used here spherical, polygonal particles with a grain size of 10-500 pm, were both organic, natural, and inorganic, mineral fillers.
• the sharpening and punching waste of these materials had the same composition as the starting materials and could therefore easily back into the extruder process be introduced.
• a disadvantage of these materials was the comparatively high proportion of hot melt adhesive in order to allow the inner cohesion of the compound. Especially at higher temperatures it could happen at lower hot melt adhesive portions that they split apart in the longitudinal direction or were brittle after cooling or solidification.
• the TW 201008765 was a method of producing environmentally friendly outsoles from recycled rice husks, wheat husks and similar phytochemicals as an additive. These raw materials are sieved, then machine-mixed evenly with natural rubber and formed into environmentally friendly sheets of material of appropriate thickness. , The result is a material for rubber outsoles that contains rice shell granules and has very good physical properties. Through this manufacturing process could
• the TW 45548 B was a "shoe-making shoe-making shoe industry" containing mainly a styrofoam waste material up to 13% by weight of the total footwear, besides the rice husk.
• polylactic acid and derivatives for an environmentally friendly and biodegradable packaging which was mainly used in the food industry, use made.
• the composition of polymers such as thermoplastic polyhydroxyalkanoates (PHA) and polyhydroxybutyrates (PHB) and inorganic filler, e.g. B. nano-calcium carbonates.
• inorganic filler e.g. B. nano-calcium carbonates.
• organic fillers e.g. B. powdered straw, sugar cane leaves, palm leaves or rice hulls up to a particle size of 20 ⁇ , had improved thermal insulation capacity.
• a typical composition z. B. consisted of 71% polylactic acid (PLA), 9% PHB and 20% nano-calcium carbonate. These materials were not suitable as thermoplastic shoe stiffening materials.
• shoe stiffening materials for the shoe cap production, as well as suitable manufacturing processes.
• shoe stiffening materials should have improved flexural strength, elongation, surface tack, as well as peel strength, as well as good biodegradability and recycle capability. Above all, the materials should be economical and ecologically produced.
• the task was mainly to find suitable filler mixtures as raw materials, on the one hand, of course, renewable resources, especially vegetable origin and on the other hand contain bioplastics and both can be used up to 75 wt.% Based on the hot melt adhesive content as fillers, without that finished thermoplastic stiffening material during processing and processing, becomes unstable, especially in the heat falls apart.
• a filler mixture which is also compatible with the known hot-melt adhesives.
• This mixture consists of bioplastic, polylactic acid powder or poly-lactic acid (PLA) powder and a specially selected plant fiber, namely purified rice husks.
• PLA poly-lactic acid
• a specially selected plant fiber namely purified rice husks.
• methods of preparation in addition to the conventional powder coating technique, on a double belt system, especially the extrusion or coextrusion in a multi-channel extruder, have proven particularly useful, which allow to process the inventive filler combination up to an amount of 75% by weight, without doing the necessary material properties, such as Thermostability, flexural strength and surface tackiness to lose.
• the products thus produced have all the properties required in practice and are therefore particularly well suited as shoe stiffening materials, as shoe caps.
• the filler component polymic acid, or the recycled polylactic acid, further referred to as PLA or r-PLA, is readily biodegradable.
• PLA is already being processed in many different applications. Uses of PLA in the packaging industry, food industry, agriculture, horticulture, medical technology, sports and functional clothing, as composites.
• PLA belongs to the bioplastics, but is also a renewable raw material, because initially the lactic acid is originally obtained from sugar and corn starch, and later by polymerization from which the polylactic acid is produced.
• Bioplastics are not a single polymer class but a large family of different types of plastics. The term is understood differently: on the one hand, bioplastics are understood to mean biodegradable plastics and, on the other, plastics that are primarily produced on the basis of agricultural raw materials. In most cases, both definitions overlap.
• PLA is readily biodegradable biologically under certain environmental conditions in industrial composting plants, under industrial compost conditions degradation takes place within a few months.
• a recycled polylactic acid, r-PLA, in powder form is preferably used.
• thermoplastic hot melt adhesives such as polycaprolactone types (Capa types) or thermoplastic polyurethanes (TPU's) or ethylene vinyl acetates (EVA ).
• the filler mixture is compatible with all of these, but also with many other thermoplastic hot melt adhesives, and can be easily processed into films, flat sheets or plates. These materials can optionally also be coated on one or both sides with a carrier material.
• the raw materials used according to the invention have the following physical properties: a. Poly-e-caprolactone types or polycaprolactone-based polyurethanes, in powder form, having a molecular weight of 40,000-80,000 g / mol and an MFI value between 2.5 and 31, depending on the type measured at 100 and 160 ° C / 2.16 kg, the particle size distribution ranges between 50 to 1000 ⁇ .
• MFI melt flow index
• Rice-powder with a particle size of 1 to 3000 ⁇ , preferably from 20 to 800 ⁇
• Polylactic acid powder and / or r-PLA powder with a MFI 2-40 g / 10min at 190 ° C / 2.16 kg, with a particle size distribution of 50 to 1000 ⁇ and a residual moisture content of max. 2500 ppm.
• As carrier materials both a hydroentangled, perforated / unperforated polyester nonwoven having a basis weight of 10 - 120g / m 2 or a cotton or cotton blend fabric having a basis weight of 25 - 120 g / m 2 are used.
• melt flow indexes The measurement of the melt flow indexes (MFI) is carried out according to the specification of DIN EN ISO 1133.
• the flexural strength of the tested products was measured according to DIN EN ISO 20864 (Domtest).
• thermoplastic stiffening materials according to the invention can be carried out by extrusion or coextrusion, but also by means of powder coating processes on a double-belt system. Production examples on a double belt system
• the powdery raw materials, the rice husks and the r-PLA proportionately mixed together to form a homogeneous powder mixture, if necessary. also agglomerated This mixture is processed on a double belt line.
• the double belt system consists of an endlessly circulating upper belt, as well as a similar lower belt, whereby an adjustable gap forms between the two belts.
• the powder mixture is given up at given pressure and temperature values and filmed.
• the heat for the filming is produced by heating plates.
• the filming means that the mixture is melted in a continuous flow process, then pressed into the flat mold and then cured after cooling.
• the difference to the double belt system consists in the fact that the heat is generated with a radiant heater or infrared radiator and the compaction of the powder by calender rolls instead of upper or lower band occurs.
• Table 1 shows the measured values of the stiffening materials produced on a double belt system.
• Reisschalenagglomerat powder consisting of 50 wt .-% rice husks with 50% by weight of EVA powder, and 15 wt .-% poly-caprolactone powder and 10 wt.% EVA powder, with 25 wt .-% r-PLA powder, all mixed homogeneously.
• compositions according to patent WO 2011/098842 were measured in the same way as the inventive compositions.
• the purified rice husks and r-PLA both together in amounts of 50 to 75 wt .-%, and the thermoplastic hot melt adhesives, in amounts of 25 to 50 wt .-%, be subjected to a pre-agglomeration.
• thermoplastic polyurethane having an MFI value of 1-25 g / 10 min, measured at 150 ° C, 10 kg, 10 wt .-% ethylene vinyl acetate copolymer having a VA content of 20 to 40 wt .-% and 20 wt , -% linear polyester poly-e-caprolactone having a molecular weight distribution of 40 to 80,000, and 40 wt .-% recycled polylactic acid powder and 15 wt.% Rice husk powder with a particle size of 400 to 800 pm, are pre-agglomerated and then in the extruder further processed.
• thermoplastic polyurethane having an MFI value of 1-25 g / 10 min, measured at 150 ° C, 10 kg, 10 wt .-% ethylene vinyl acetate copolymer having a VA content of 20 to 20 wt .-% are with 45% by weight of recycled polylactic acid powder having an MFI (melt flow index) of 15-35 g / 10 min and 15% by weight of rice husk powder having a particle size of 350 to 700 ⁇ m are pre-agglomerated and then further processed in the extruder.
• MFI melt flow index
• 10% by weight of ethylene vinyl acetate copolymer having a VA content of 20 to 40% by weight and 60% by weight of linear polyester poly-e-caprolactone having a molecular weight distribution of 40 to 80,000 are mixed with 30% by weight of wood powder having a bulk density of about 25 g / ml of a residual moisture of less than 9% and then further processed in the extruder.
• each melt layer is formed in a separate flow channel.
• the melt distribution of each individual layer can be corrected across the width by means of dust beams. Only in the area of the ironing zone, that is the area shortly before the melt emerges the nozzle, the individual melt streams flow together.
• the thickness distribution of the overall composite can be corrected by adjusting the exit gap.
• the final product after coextrusion has a 3-layer structure consisting of a "core" consisting of the filler mixture, especially of rice husk and r-PLA, and hot melt adhesive, as well as 2 outer adhesive layers of the thermoplastic hot melt adhesives.
• the melt stream A for example, from 50 wt .-% r-PLA and 25 wt .-% rice husks, and 25 wt .-% EVA and the two outer adhesive layers, as shown in Figure 1,
• the melt streams B and C can be selected from EVA, thermoplastic polyurethanes or polyesters, e.g. As polycaprolactones, which are applied together in an amount of about 10 to 250 g per m 2 of the surface of this core.
• the thickness of these adhesive layers can be from 0.1 to 2 pm.
• the filler mixture that forms the "inner core" may optionally also be pre-agglomerated prior to extrusion.
• Coextrusion is particularly advantageous when the inner core contains up to 75% by weight of filler mixture, because this can reduce the amount of hot melt adhesive in the core, which has considerable economic advantages.
• the ratio of (fillers in the core): (adhesive in the core) can therefore be up to 3: 1.
• This material composition in the core, the 3-layer structure and the variation of the layer thickness or adhesive amount in the outer layers make it possible, as needed, to realize different stiffnesses and flexural strengths and it also has advantages in introducing and handling the shoe caps in the shoe during the shoe production.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

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• 2012
  • 2012-07-05 DE DE201210013432 patent/DE102012013432B4/de active Active
• 2013
  • 2013-06-27 PT PT13736759T patent/PT2890259T/pt unknown
  • 2013-06-27 SI SI201331552T patent/SI2890259T1/sl unknown
  • 2013-06-27 HK HK15110639.9A patent/HK1209601A1/xx unknown
  • 2013-06-27 WO PCT/EP2013/001894 patent/WO2014005684A1/de not_active Ceased
  • 2013-06-27 EP EP13736759.5A patent/EP2890259B1/de not_active Not-in-force
  • 2013-06-27 ES ES13736759T patent/ES2741432T3/es active Active
  • 2013-06-27 JP JP2015518891A patent/JP6038306B2/ja not_active Expired - Fee Related
  • 2013-06-27 US US14/410,428 patent/US20150322243A1/en not_active Abandoned
  • 2013-06-27 CN CN201380035805.3A patent/CN104602558A/zh active Pending
  • 2013-07-03 TW TW102123913A patent/TWI504670B/zh not_active IP Right Cessation
  • 2013-07-03 AR ARP130102375 patent/AR091667A1/es unknown

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