EP4237474A1 - Particules polymères thermoplastiques expansibles à base de polymères de styrène et procédé de préparation associé - Google Patents

Particules polymères thermoplastiques expansibles à base de polymères de styrène et procédé de préparation associé

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Publication number
EP4237474A1
EP4237474A1 EP21801543.6A EP21801543A EP4237474A1 EP 4237474 A1 EP4237474 A1 EP 4237474A1 EP 21801543 A EP21801543 A EP 21801543A EP 4237474 A1 EP4237474 A1 EP 4237474A1
Authority
EP
European Patent Office
Prior art keywords
polymer particles
expandable
styrene
thermoplastic polymer
weight
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
EP21801543.6A
Other languages
German (de)
English (en)
Inventor
Bianca WILHELMUS
Yvonne VAN VEEN
Dominik DÖRR
Sebastian GRÖSCHEL
Tobias STANDAU
Volker ALTSTÄDT
Regino WEBER
Thomas Neumeyer
Peter Schreier
Max LÖHNER
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.)
Ineos Styrolution Group GmbH
Original Assignee
Ineos Styrolution Group 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 Ineos Styrolution Group GmbH filed Critical Ineos Styrolution Group GmbH
Publication of EP4237474A1 publication Critical patent/EP4237474A1/fr
Pending legal-status Critical Current

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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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/22—After-treatment of expandable particles; Forming foamed products
    • C08J9/228—Forming foamed products
    • C08J9/232—Forming foamed products by sintering expandable particles
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141—Hydrocarbons
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/03—Extrusion of the foamable blend
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/034—Post-expanding of foam beads or sheets
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • 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
    • C08J2325/00—Characterised by the use 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 aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/08—Copolymers of styrene
    • 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
    • C08J2325/00—Characterised by the use 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 aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/08—Copolymers of styrene
    • C08J2325/12—Copolymers of styrene with unsaturated nitriles
    • 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
    • C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
    • C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers

Definitions

  • the invention relates to expandable polymer particles based on styrene polymers, a process for their production and the use of the expandable polymer particles for foam moldings.
  • Particle foams have been used in numerous applications for years, including building insulation, packaging, and automotive structural lightweight wall materials.
  • Particle foams usually consist of many foamed (expanded) polymer beads that are welded together. Compared to solid materials, particle foams typically offer the advantage of weight reduction with good mechanical properties at the same time.
  • Particle foams made from polyolefins such as polyethylene
  • polyolefins such as polyethylene
  • CN-A 107501595 describes a process for producing particles made from expanded polypropylene.
  • a disadvantage of particle foams made from polyolefins is that they have to be completely foamed during production, since the blowing agent does not remain in the polymer material for a long time. It is not possible to produce polyolefin particles loaded with blowing agent which can still be expanded after a certain storage time. Therefore, a temporal and spatial separation of production of the particles and processing (foaming) is not possible, which is desirable in practice. Only polyolefin particles that have already been foamed can be manufactured and processed. Due to the high total volume, the transport of such particles is more complex than the transport of non-foamed products or particles.
  • EP-A 2384355 (BASF) describes expandable, thermoplastic polymer particles containing a styrene polymer and a polyolefin. Since the polymers used are not miscible with one another, a compatibilizer must be used to adjust the morphology.
  • the use of polyolefins and compatibilizers is necessary to achieve particle foams with high rigidity and good elasticity, which cannot be achieved with a particle foam consisting only of polystyrene.
  • the use of polyolefins with a compatibilizer requires at least one additional process step, the production of a blend of at least three components, polystyrene, polyolefin and compatibilizer.
  • suitable compatibilizers are often complex and the production of these components is expensive.
  • a material consisting of only one type of polymer is advantageous, which can be reintroduced into the corresponding material cycle.
  • US Pat. No. 4,108,806 (Dow, 1978) describes a process for producing expanded and expandable polymer particles based on a polyolefin matrix, into which expandable microspheres are introduced.
  • the microspheres consist of a thermoplastic shell and a core of a volatile liquid blowing agent, which causes the polymer mass to expand when heated. This production method is complex and a polymer mixture of two or more types of polymers is produced.
  • WO 2013/085742 (Dow) describes the provision of an extruded polymer foam using a blowing agent mixture of 74-78% by weight of 1,1,1,2-tetrafluoroethane, 13-16% by weight of CO2 and 7- 9 wt .-% water is produced, but it is not based on the provision of expandable polymer particles.
  • US7919538 (Dow) describes a particle foam consisting of SAN and an additive that shields infrared radiation for the purpose of improved thermal insulation; expandable polymer particles are not sought.
  • US3945956 describes a process for producing expandable polymer particles in which a volatile liquid blowing agent is enclosed in a hollow sphere made of styrene and acrylonitrile.
  • the blowing agent is encapsulated in a polymer particle but not homogeneously distributed in a polymer matrix. When such polymer particles expand, this results in a foam with inhomogeneously distributed cavities.
  • US5480599 describes a process for producing particle foams.
  • the propellant can be at least partially recovered after expansion of the particles.
  • the process only provides expanded polymer particles, not expandable particles.
  • US5049328 describes a process for producing foam without organic blowing agents. Only inert gases such as CO2, nitrogen or air are used as propellants. The process is not suitable for providing expandable polymer particles that can be stored for a certain period of time (eg days, weeks, months). the gases consisting of small molecules can escape quickly from the polymer mass if necessary.
  • An object of the present invention is therefore to provide expandable, thermoplastic polymer particles with low loss of blowing agent and high expansion capacity, which (even after processing) can be recycled without great technical effort and which can be processed into particle foams with high rigidity and good elasticity, and a Process for their manufacture.
  • the expandable, thermoplastic polymer particles contain or preferably consist of:
  • B) 1 to 10% by weight, preferably 3 to 7% by weight, based on the total weight of (A), (B) and (C), of one or more blowing agents (B);
  • C 0 to 3% by weight, preferably 0.1 to 2% by weight, based on the total weight of (A), (B) and (C), of one or more nucleating agents or nucleating agents (C); and optionally one or more further additives (Z) in an amount which does not impair the formation of domains and the resulting foam structure.
  • the expandable, thermoplastic polymer particles generally contain no further polymers apart from the one or more styrene polymers (A); where the styrene polymers (A) are miscible with one another if the expandable, thermoplastic polymer particles contain a plurality of styrene polymers (A); and wherein the expandable, thermoplastic polymer particles are thermoplastically recyclable.
  • thermoplastically recyclable means that the expandable, thermoplastic polymer particles are well suited (without high technical complexity) for recycling, for example in a mechanical recycling process.
  • Styrene polymers are particularly suitable for recycling if the styrene polymer (A) consists of only one polymer class, or if the several styrene polymers (A) consist of polymer classes that are readily miscible with one another, such as SAN, AMSAN, ABS and ASA.
  • the styrenic polymer (A) consists of only one class of polymers such as SAN, AMSAN, ABS and ASA.
  • the expandable polymer particles according to the invention can be recycled particularly well, for example in mechanical recycling processes.
  • the styrene polymer (A) consists of polymer classes which are miscible with one another. Even then, there is a good ability or suitability for recycling, e.g. in mechanical recycling processes. Good miscibility is shown, for example, by the fact that two or more phases are not formed at the processing temperature (e.g. 200-260 °C).
  • the blowing agent (B) is preferably distributed homogeneously in the expandable, thermoplastic polymer particles in a polymer matrix composed of one or more of the styrene polymers (A).
  • the expandable thermoplastic polymer particles contain 87 to 99% by weight, preferably 91 to 97% by weight, particularly preferably 93.5 to 97% by weight, based on the total weight of (A), (B) and (C) , one or more styrene polymers (A), which are selected, for example, from the group consisting of styrene-acrylonitrile copolymers (SAN), acrylonitrile-butadiene-styrene copolymers (ABS), acrylate-styrene-acrylonitrile copolymers (ASA) , methyl methacrylate-acrylonitrile-butadiene-styrene copolymers (MABS), methyl methacrylate-butadiene-styrene copolymers (MBS), a(alpha)-methylstyrene-acrylonitrile copolymers (AMSAN), styrene-methyl methacrylate copolymers (SMMA), amorphous
  • the styrene polymer (A) is preferably selected from the group consisting of styrene-acrylonitrile copolymers (SAN), acrylonitrile-butadiene-styrene copolymers (ABS) or acrylonitrile-styrene-acrylate copolymers (ASA).
  • SAN styrene-acrylonitrile copolymers
  • ABS acrylonitrile-butadiene-styrene copolymers
  • ASA acrylonitrile-styrene-acrylate copolymers
  • Styrene-acrylonitrile copolymers, acrylonitrile-butadiene-styrene copolymers or acrylonitrile-styrene-acrylate copolymers with a melt volume rate MVR (220° C./10 kg) according to ISO 1133 in the range from 1 to 12 cm 3 /10 min are particularly preferred , preferably in the range from 1 to 10 cm 3 /10 min.
  • the styrene polymer (A) contains no styrene homopolymer.
  • the expandable, thermoplastic polymer particles contain no other polymers than the styrene polymer (A), which preferably contains no styrene homopolymer.
  • Component (A) consists, for example, of SAN, ABS, ASA and/or mixtures containing at least two of these polymers. In the case of ABS as component (A), at least one component (C) is preferably also used.
  • the expandable, thermoplastic polymer particles contain 1 to 10% by weight, preferably 3 to 7% by weight, particularly preferably 4 to 6% by weight, based on the total weight of (A), (B) and (C), one or more physical blowing agents, such as CO2, aliphatic Cs to Cs hydrocarbons, alcohols, ketones, ethers or halogenated hydrocarbons, preferably CO2 or alternatively isobutane, n-butane, isopentane , n-pentane (bp 36°C), cyclopentane, or mixtures thereof.
  • one or more physical blowing agents such as CO2, aliphatic Cs to Cs hydrocarbons, alcohols, ketones, ethers or halogenated hydrocarbons, preferably CO2 or alternatively isobutane, n-butane, isopentane , n-pentane (bp 36°C), cyclopentane, or mixtures thereof.
  • the expandable, thermoplastic polymer particles contain 0 to 3% by weight, preferably 0 to 2% by weight, often 0.1 to 2% by weight, particularly preferably 0.1 to 0.8% by weight. -%, based on the total weight of (A), (B) and (C), of one or more nucleating or nucleating agents, for example talc, alumina or silica.
  • additives (Z) such as plasticizers, flame retardants, soluble and insoluble inorganic and / or organic dyes and pigments, fillers, co-blowing agents or other additives can be added in amounts to the expandable, thermoplastic polymer particles, which the domain formation and from it do not impair the resulting foam structure (e.g. in the range from 0.1 to 5% by weight, in the range from 0.1 to 2% by weight, preferably from 0.1 to 0.9% by weight, based on the total composition).
  • additives (Z) such as plasticizers, flame retardants, soluble and insoluble inorganic and / or organic dyes and pigments, fillers, co-blowing agents or other additives can be added in amounts to the expandable, thermoplastic polymer particles, which the domain formation and from it do not impair the resulting foam structure (e.g. in the range from 0.1 to 5% by weight, in the range from 0.1 to 2% by weight, preferably from 0.1 to 0.9% by weight, based on the total composition).
  • Customary plastic additives and auxiliaries can be present as additives in the expandable, thermoplastic polymer particles.
  • an additive or an auxiliary can be selected from the group consisting of antioxidants, UV stabilizers, peroxide destroyers, antistatic agents, lubricants, mold release agents, flame retardants, fillers or reinforcing materials (glass fibers, carbon fibers, etc.), colorants and combinations of two or more of it.
  • oxidation retardants and heat stabilizers are halides of metals from group I of the periodic table, for example sodium, potassium and/or lithium halides, optionally in combination with copper(I) halides, for example chlorides, bromides, Iodides, sterically hindered phenols, hydroquinones, substituted representatives of these groups and mixtures thereof in concentrations of up to 1% by weight, based on the total weight of the expandable, thermoplastic polymer particles.
  • organic dyes such as nigrosine, pigments such as titanium dioxide, phthalocyanines, ultramarine blue and carbon black can be contained as dyes in the thermoplastic polymer particles, as well as fibrous and pulverulent fillers and reinforcing agents.
  • examples of the latter are carbon fibers, glass fibers, amorphous silica, calcium silicate (wollastonite), aluminum silicate, magnesium carbonate, kaolin, chalk, powdered quartz, mica and feldspar.
  • Long-chain fatty acids are examples of lubricants and mold release agents, which can generally be used in amounts of up to 1% by weight, often 0.1-0.8% by weight, based on the total weight of the expandable, thermoplastic polymer particles such as stearic acid or behenic acid, their salts (e.g. Ca or Zn stearate) or esters (e.g. stearyl stearate or pentaerythritol tetrastearate) and amide derivatives (e.g. ethylenebisstearylamide).
  • their salts e.g. Ca or Zn stearate
  • esters e.g. stearyl stearate or pentaerythritol tetrastearate
  • amide derivatives e.g. ethylenebisstearylamide
  • Mineral-based antiblocking agents can also be present in amounts of up to 0.1% by weight, based on the total weight of the expandable, thermoplastic polymer particles. Examples which may be mentioned are amorphous or crystalline silica, calcium carbonate or aluminum silicate.
  • Mineral oil preferably medicinal white oil
  • plasticizers which may be mentioned are dioctyl phthalate, dibenzyl phthalate, butylbenzyl phthalate, hydrocarbon oils, N-(n-butyl)benzenesulfonamide and o- and p-tolylethylsulfonamide.
  • non-halogen-containing flame retardants known for the respective thermoplastics can be present, in particular those based on phosphorus compounds.
  • the expandable, thermoplastic polymer particles consist of the styrene polymer (A) and the blowing agent (B). In a further embodiment, the expandable, thermoplastic polymer particles consist of the styrene polymer (A), the blowing agent (B) and the nucleating agent or nucleating agent (C). In a further embodiment, the expandable, thermoplastic polymer particles consist of the styrene polymer (A), the blowing agent (B), the nucleating agent or nucleating agent (C) and other additives (Z) in amounts which do not impair domain formation and the resulting foam structure.
  • styrene polymer (A) is an acrylonitrile-butadiene-styrene copolymer (ABS)
  • ABS acrylonitrile-butadiene-styrene copolymer
  • C nucleating agent
  • One subject of the invention is a process for producing expandable, thermoplastic polymer particles, comprising the steps of: a) mixing a styrene polymer (A) with a blowing agent (B) and optionally a nucleating agent or nucleating agent (C), and optionally additives in amounts that Do not affect domain formation and resulting foam structure, so that a polymer mixture (I) is formed. b) pre-expanding the polymer mixture (I).
  • only the styrenic polymer (A) and the blowing agent (B) are used as starting materials in the process.
  • only the styrenic polymer (A), the blowing agent (B) and the nucleating agent or nucleating agent (C) are used in the process.
  • only the styrene polymer (A), the blowing agent (B), the nucleating agent or the nucleating agent (C) and other additives (Z) are used in the process in amounts which do not impair domain formation and the resulting foam structure.
  • At least step b), particularly preferably steps a) and b), preferably takes place under a pressure which exceeds atmospheric pressure.
  • process steps a) and b) take place in an extruder with subsequent underwater granulation at a pressure in the range from 1.5 to 11 bar.
  • process steps a) and b) take place in an autoclave.
  • the granulated styrene polymer (A) to which a nucleating agent (C) and optionally further additives have optionally been added, is impregnated under pressure with the blowing agent (B) to form expandable, thermoplastic polymer particles. These can then be isolated or obtained as prefoamed foam particles directly by decompression.
  • the styrene polymer (A) is synthesized in a suspension and treated with a physical blowing agent.
  • a continuous process is particularly preferred in which, in process step a), a thermoplastic styrene polymer (A), for example SAN, ABS or ASA, optionally mixed with the nucleating agent (C) and optionally the other additives, is melted in a twin-screw extruder and mixed with the blowing agent ( B) is impregnated.
  • the melt loaded with blowing agent can then be extruded and cut in process step b) through an appropriate nozzle to form foam sheets, strands or particles.
  • a preferred embodiment is extrusion through a microperforated plate with one or, as a rule, several holes with a hole diameter of 0.1 to 2.4 mm, preferably 0.2 to 1.2 mm, particularly preferably from 0.5 to 0.8 mm, so that particles are formed.
  • the melt emerging from the microperforated plate is fed into a stream of water, where the melt is cut up into individual particles by a suitable device.
  • the setting of the appropriate back pressure and a suitable temperature in the water flow of this so-called underwater granulation enables a targeted production of expandable polymer particles.
  • the expandable, thermoplastic polymer particles according to the invention preferably have an average particle diameter in the range from 0.1 to 3 mm, preferably from 0.3 to 2 mm, particularly preferably from 0.5 to 1 mm. Expandable polymer particles with a narrow particle size distribution and an average particle diameter in the range mentioned lead to better filling of the mold when the polymer particles are welded to form a molded part. They enable a more filigree part design and a better part surface. In a further preferred embodiment, the expandable, thermoplastic polymer particles are prefoamed. The expandable polymer particles obtained are preferably foamed to an average diameter in the range from 0.2 to 10 mm.
  • the specific density of the expanded polymer particles is preferably in the range from 10 to 250 g/l, particularly preferably 20 to 200 g/l, particularly preferably 25 to 150 g/l and particularly preferably 30-100 g/l.
  • the expandable, thermoplastic polymer particles according to the invention can be filled into a mold which is then closed and hot air or steam flows through it and is thus heated.
  • the polymer particles expand further, ideally until the cavity is completely filled, and thus form foam moldings.
  • the processing pressure is chosen so low that the domain structure in the cell membranes is preserved.
  • the pressure is usually in the range from 0.5 to 1.0 bar.
  • a further object of the invention is accordingly the use of expandable, thermoplastic polymer particles as described above in a foam molding formed by welding the expandable polymer particles by means of hot air or steam.
  • the molding preferably has a specific density of less than 250 g/l, preferably less than 150 g/l.
  • the invention also relates to the foams or moldings obtained from the expandable, thermoplastic polymer particles.
  • the polymers (A) were mixed with the blowing agent (B) and optionally the nucleating agent (C) at 200-240 °C melted and mixed homogeneously.
  • the polymer mixture (I) obtained in this way was then cooled in a single-screw extruder (type E 45 M, manufacturer Collin GmbH) with a screw diameter of 45 mm and a length-to-diameter ratio of 30, and the melt was extruded through a heated perforated plate.
  • the polymer strand was cut off by means of underwater pelletizing, so that a propellant-loaded minigranulate with a narrow particle size distribution was obtained.
  • the minigranules loaded with blowing agent were then prefoamed in an X-Line 3 prefoamer (manufacturer Kurtz GmbH).
  • the pre-foamed polymer particles were welded in a TVZ 162/100 PP molding machine (manufacturer Teubert Maschinenbau GmbH) at approx. 120-125 °C in order to produce test specimens for measuring the thermal and mechanical properties.
  • the density of the prefoamed particles was determined in accordance with ISO 1183 using an AG245 density balance (manufacturer: Mettler Toledo).
  • the thermal characterization of the test specimens was carried out according to DIN EN 12667 with a heat flow measuring plate apparatus type HMF Lambda Small (manufacturer Netzsch) using test specimens with the dimensions 200 x 200 x 20 mm and a temperature gradient of 20 K.
  • test specimens The mechanical characterization of the test specimens was carried out using a 3-point bending test with a universal testing machine 1485 (manufacturer Zwick Roell) in accordance with ISO 1209 on test specimens measuring 120 x 25 x 20 mm, with a pressure of 0.5 N and a test speed of 10 mm /min
  • test specimens from the compositions according to the invention have better mechanical properties than the test specimens from the composition not according to the invention (comparative test 4).
  • compositions according to the invention can be stored well and lead to a better flexural modulus in test specimens than the bodies made from the composition not according to the invention (comparison 4).
  • blowing agents such as isobutane, n-butane, isopentane and cyclopentane instead of n-pentane.
  • the polymer products obtained or the moldings made of SAN or ABS can be recycled without great effort, e.g. with the recovery of styrene, which also makes them interesting for ecological reasons.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

La présente invention concerne des particules polymères expansibles à base de polymères de styrène, un procédé de préparation de ces particules et l'utilisation des particules polymères expansibles dans une pièce moulée en mousse. Les particules polymères contiennent A) 87 à 99 % en poids d'un ou plusieurs polymères de styrène (A), par rapport au poids total de (A), de (B) et de (C) ; B) 1 à 10 % en poids d'un ou plusieurs agents d'expansion (B) ; C) 0 à 3 % en poids d'un ou plusieurs nucléateurs ou agents de nucléation C) ; et éventuellement d'autres additifs (Z) en des quantités qui ne dégradent pas la formation de domaines et la structure de mousse qui en résulte.
EP21801543.6A 2020-10-30 2021-10-28 Particules polymères thermoplastiques expansibles à base de polymères de styrène et procédé de préparation associé Pending EP4237474A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20204862 2020-10-30
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WO2024008911A1 (fr) 2022-07-08 2024-01-11 Ineos Styrolution Group Gmbh Particules de polymères thermoplastiques expansibles ayant une teneur en matériau recyclé, et leur procédé de production
EP4551643A1 (fr) 2022-07-08 2025-05-14 INEOS Styrolution Group GmbH Particules de polymère thermoplastique expansé ayant une teneur en matériau recyclé, et leur procédé de production

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