EP3571173A1 - Matériau granulaire thermo-isolant et son procédé de fabrication - Google Patents

Matériau granulaire thermo-isolant et son procédé de fabrication

Info

Publication number
EP3571173A1
EP3571173A1 EP18700427.0A EP18700427A EP3571173A1 EP 3571173 A1 EP3571173 A1 EP 3571173A1 EP 18700427 A EP18700427 A EP 18700427A EP 3571173 A1 EP3571173 A1 EP 3571173A1
Authority
EP
European Patent Office
Prior art keywords
granules
silica
compression
compressive stress
kpa
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
EP18700427.0A
Other languages
German (de)
English (en)
Inventor
Matthias Geisler
Ann-Kathrin Herr
Christian MOERS
Gabriele Gärtner
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.)
Evonik Operations GmbH
Original Assignee
Evonik Degussa 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 Evonik Degussa GmbH filed Critical Evonik Degussa GmbH
Publication of EP3571173A1 publication Critical patent/EP3571173A1/fr
Pending legal-status Critical Current

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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention relates to a granular material having improved mechanical stability, and to processes for its production and use
  • silica-based insulating materials are usually the so-called aerogels, as well as precipitated or pyrogenic produced
  • Silica used Further information on these silica types can be found in Ullmann's Encyclopedia of Industrial Chemistry, chapter "Silica” published online on 15.04.2008, DOI: 10.1002 / 14356007.a23_583.pub3.
  • WO 2006/097668 A1 discloses a granular thermal insulation material comprising hydrophobic fumed silica and a clouding agent which is prepared by mixing a hydrophobic silica with clouding agent and the subsequent densification into granules having a size of 0.25 to 2.5 mm. Such products are characterized by a relatively high tamped density of 250 to 450 g / L.
  • EP2910724A1 discloses a frame filled with heat-insulating material, comprising a mixture of hydrophobized pyrogenically prepared silica having an average diameter of 1 to 100 ⁇ m and a clouding agent
  • EP 0725037 A1 describes granules having an average grain diameter of 10 to 120 ⁇ m based on hydrophobic pyrogenically produced silicon dioxide for use as a catalyst support. Such granules have a tamped density of 260 to 570 g / L and are obtained by spray-drying a silica-containing aqueous Dispersion, tempering at temperatures of 150 to 1 100 ° C and subsequent hydrophobing made with organosilicon compounds.
  • European Application 16181905.7 discloses the preparation of a heat-insulating material comprising hydrophobic silicas and opacifiers by treating a precipitated powdered silica with a silane, mixing with a hydrophilic pyrogenic silica and subsequent thermal treatment at 40-200 ° C. The resulting powdered mixture can be heated before thermal
  • Treatment can be optionally compressed to a granulate with a tamped density of 100-400 g / L.
  • DE 2903487 A1 discloses a process for producing powdery hydrophobic silicon dioxides by the treatment of hydrophilic silicas with
  • US 006099749 A discloses a process for producing finely divided compacted compositions comprising hydrophilic silicas which have been treated with ammonia before compacting.
  • silica-based powdery and granular thermal insulation materials ensure sufficient thermal insulation, they have a relatively high density and / or are not optimized with regard to mechanical stability.
  • the object of the present invention was to provide a hydrophobic thermal insulation material in a simple and practical form, which has very good mechanical stability and Abriebeigenschaften with low densities and thus low cost.
  • This object was achieved by providing a granulate containing hydrophobized silicon dioxide and at least one IR opacifier, a tamped density of up to 250 g / L and a compressive stress according to DIN EN 826: 2013 at 50% compression of 150 to 300 kPa or greater than 300 kPa has, wherein the compressive stress measurement on a bed with square area, having edge length 200 mm and 20 mm dump height, solved.
  • the term "granules" in the present invention is understood to mean a granular, readily pourable, free-flowing solid.
  • Tamping densities of various powdery or coarse-grained granular materials can be determined according to DIN ISO 787-1 1: 1995 "General test methods for pigments and fillers - Part 1 1: Determination of tamping volume and tamped density. The filling density of a bed after shaking and pounding is measured.
  • the granules according to the invention have a tamped density of up to 250 g / L, preferably from 50 to 250 g / L, preferably from 100 to 240 g / L, particularly preferably from 130 to 230 g / L.
  • Mechanical strength of the granules of the invention can be measured by measuring the compressive stress in the packing of such materials. Such a compressive stress measurement is based on DIN EN 826: 2013 "Thermal insulation products for construction - Determination of the
  • this standard specifies the compressive stress of plates at 10% compression, which is less optimal for bulk materials due to an inherently too large roughness on the bed surface than for the plates, this roughness would be the measurement inaccuracy of too small upsets, For this reason, in the present application the compressive stress measurement was carried out at 50% compression according to DIN EN 826: 2013, wherein the compressive stress measurement takes place on a bed with a square surface with edge length 200 mm and bed height 20 mm. The lateral boundary was realized with a soft foam which keeps the sample in position during the preparation.
  • a compressive force at 50% compression which can be converted into a compressive stress over the surface of the sample, is measured:
  • Compression ⁇ is defined here as the ratio of the reduction in thickness of the test specimen (in the present case, bed consisting of the granules according to the invention) to its initial thickness, measured in the loading direction.
  • the granules according to the invention have a compressive stress according to DIN EN 826: 2013 at 50% compression of 150 to 300 kPa, preferably 170 to 300 kPa, more preferably 200 to 300 kPa, most preferably 250 to 300 kPa, wherein the compressive stress measurement on a bed with square area, having edge length 200 mm and
  • a numerical mean particle size of the granules according to the invention can be determined according to IS013320: 2009 by laser diffraction particle size analysis.
  • the average value d.sub.so which represents which particle size does not exceed 50% of all particles, is defined as a numerical average particle size.
  • the granulate according to the invention may have a d.sub.50 value of greater than 10 .mu.m, is preferably from 20 to 4000 .mu.m, preferably from 50 to 3500 .mu.m, more preferably from 100 to 3000 .mu.m, very particularly preferably from 150 to 2500 .mu.m.
  • the granules of the present invention preferably contains only the particles having a size of at most 6000 ⁇ m, preferably from 50 to 5000 ⁇ m, particularly preferably from 200 to 4000 ⁇ m determined by dynamic image analysis according to ISO 13322-2: 2006. Most preferably, the granules of the invention are free of particles which are smaller than 200 ⁇ .
  • the granules according to the invention may have a BET surface area of greater than 20 m 2 / g, preferably from 30 to 500 m 2 / g, more preferably from 50 to 400 m 2 / g, most preferably from 70 to 350 m 2 / g.
  • the specific surface area also called BET surface area, is determined according to DIN 9277: 2014 by nitrogen adsorption using the Brunauer-Emmett-Teller method.
  • the granules according to the invention contain hydrophobized silica.
  • hydrophobic refers to the particles having a low affinity for polar media such as water, whereas the hydrophilic particles have a high affinity for polar media such as water.
  • the hydrophobicity of the hydrophobic materials also called hydrophobicity
  • the degree of hydrophobicity of a hydrophobic silica can be determined, inter alia, by its methanol wettability, as described in more detail, for example, in WO201 1/076518 A1, pages 5-6, in pure water , a hydrophobic silica separates completely from the water and floats on the water
  • the granules according to the invention have a methanol wettability of greater than 5, preferably from 10 to 80, preferably from 15 to 70, more preferably from 20 to 65, most preferably from 25 to 60 wt .-% methanol content in a methanol-water mixture ,
  • the granules according to the invention contain at least one IR opacifier.
  • Such an IR opacifier reduces the infrared transmission of a thermal barrier material and thus minimizes the heat transfer by radiation.
  • the IR opacifier is selected from the group consisting of silicon carbide, titania, zirconia, ilmenite, iron titanates, iron oxides, zirconium silicates, manganese oxides, graphites, carbon blacks, and mixtures thereof.
  • the particle size of the opacifier is usually between 0.1 to 25 ⁇ .
  • the granules of the present invention may contain from 30 to 95, preferably from 40 to 90, particularly preferably from 50 to 85,% by weight of the silicon dioxide and from 5 to 50, preferably from 10 to 40, particularly preferably from 15 to 30, parts by weight. Contain% of opacifier.
  • the granules of the present invention are excellent
  • Thermal insulation properties and can be used for thermal insulation.
  • the thermal conductivity of the granules according to the invention can be measured according to the method with the disk device and the heat flow meter device according to EN 12667: 2001.
  • the mean measuring temperature is 10 ° C and the
  • the thermal conductivity of the granulate according to the invention as a bed is preferably less than 50 mW / (m * K), preferably from 10 to 45, more preferably from 15 to 40, most preferably from 20 to 35 mW / (m * K).
  • the granules according to the invention contain silicon dioxide. This silica may include one or more commonly known types of silicas such as the so-called aerogels, xerogels, perlites, precipitated silicas, fumed silicas.
  • the granules according to the invention preferably contain one or more pyrogenic silicas.
  • Pyrogenic silicas are produced by means of flame hydrolysis or flame oxidation.
  • hydrolyzable or oxidizable starting materials are generally oxidized or hydrolyzed in a hydrogen-oxygen flame.
  • Starting materials for pyrogenic processes can be used organic and inorganic substances. Particularly suitable is silicon tetrachloride.
  • the hydrophilic silica thus obtained is amorphous. Fumed silicas are usually present in aggregated form. By “aggregated” is meant that so-called
  • Primary particles which initially arise in the genesis, combine firmly in the further course of the reaction to form a three-dimensional network.
  • the primary particles are largely free of pores and have free on their surface
  • the granules according to the invention are characterized by a particularly high stability at a low tamped density. This can be shown, for example, by means of the particle size decrease of a suspension of the investigated granules under defined ultrasound application in isopropanol, as is explained in greater detail in the description of the exemplary embodiments. This test shows that the granules according to the invention have a particularly high stability at a low tamped density. This can be shown, for example, by means of the particle size decrease of a suspension of the investigated granules under defined ultrasound application in isopropanol, as is explained in greater detail in the description of the exemplary embodiments. This test shows that the granules according to the invention have a
  • the granules according to the invention can be used for thermal insulation.
  • the granules of the invention may be used in heat-insulating mixtures and / or formulations.
  • the corresponding heat-insulating mixtures and / or formulations may contain at least one solvent and / or binder and / or one filler.
  • the solvent may be selected from the group consisting of water, alcohols, aliphatic and aromatic hydrocarbons, ethers, esters, aldehydes, ketones and mixtures thereof.
  • water, methanol, ethanol, propanol, butanol, pentane, hexane, benzene, toluene, xylene, diethyl ether, methyl tert-butyl ether, ethyl acetate, acetone can be used.
  • the binder may contain organic or inorganic substances. The binder preferably contains reactive organic substances.
  • Organic binders may, for example, be selected from the group consisting of (meth) acrylates, alkyd resins, epoxy resins, gum arabic, casein, vegetable oils, polyurethanes, silicone resins, wax, cellulosic glue.
  • reactive organic substances may, for example, by polymerization, crosslinking reaction or another chemical reaction type for curing the heat-insulating formulation used and / or the heat-insulating mixture.
  • the heat-insulating formulation and / or the heat-insulating mixture may be inorganic curable
  • Inorganic also referred to as mineral binders have essentially the same as the organic binder task to combine aggregates together. Furthermore, inorganic binders are used in
  • Non-hydraulic binders are water-soluble binders such as white limestone, dolomitic lime, gypsum and anhydrite, which harden only in the air.
  • Hydraulic binders are binders that harden in the air and under water and are insoluble in water after curing. These include hydraulic limestones, cements, plaster and masonry binders.
  • a further subject of the present invention is a process (A) for producing a granulate containing hydrophobized silicon dioxide and at least one
  • IR opacifier comprising the following steps:
  • step b) compression of the mixture obtained in step a) into a granulate
  • step b) thermal treatment of the granules produced in step b) at a temperature of 200 to 1200 ° C;
  • step d) hydrophobing of the thermally treated granules from step c) with a hydrophobing agent.
  • Another subject matter of the invention is a further process (B) for producing a granulate containing hydrophobized silica and at least one IR opacifier, comprising the following steps:
  • step b) compression of the mixture obtained in step a) into a granulate
  • step c) treatment of the granules produced in step b) with ammonia; d) hydrophobing of the ammonia-treated granules from step c) with a hydrophobing agent.
  • Steps a) and b) of the processes (A) and (B) according to the invention can be carried out as individual, separate stages or alternatively combined in one process step.
  • Compaction of the mixture obtained in step a) to give granules according to step b) of process (A) or of process (B) can be carried out by venting or compaction.
  • Thermal treatment of the granules prepared in step b) in process (A) can at temperatures from 200 to 1500 ° C, preferably from 400 to 1400, preferably from 500 to 1200, more preferably from 600 to 1 100, most preferably from 800 to 1 100 ° C are performed.
  • step c) of the process (B) according to the invention the treatment of the granules produced in step b) with ammonia, preferably with gaseous ammonia takes place.
  • the period of time in which step c) of the process (B) according to the invention is carried out depends inter alia on the composition of the heat-insulating molded body and its thickness. In general, the time period is 10 minutes to 100 hours, preferably 0.5 to 20 hours. Preferred temperatures are in the range from 0 to 200 ° C., more preferably from 20 to 100 ° C.
  • ammonia can be introduced into the chamber provided for this purpose with the granules to be treated.
  • the only requirement placed on the chamber is that it can maintain the pressures and temperatures required in the process according to the invention.
  • steam may be added to the previously prepared granules, preferably at a relative vapor pressure of 50 to 95%.
  • the hydrophobizing agent used in step d) of process (A) or (B) may contain a silicon-containing compound, which is preferably selected from the group consisting of halosilanes, alkoxysilanes, silazanes or siloxanes.
  • Such a silicon-containing compound is particularly preferably a liquid compound having at least one alkyl group and a boiling point of less than 200 ° C. It is preferably selected from the group consisting of CH 3 SiCl 3 , (CH 3 ) 2 SiCl 2 , (CH 3 ) 3 SiCl, C 2 H 5 SiCl 3 , (C 2 H 5 ) 2 SiCl 2 , (C 2 H 5 ) 3 SiCl, C 3 H 8 SiCl 3 , CH 3 Si (OCH 3 ) 3 , (CH 3 ) 2 Si (OCH 3 ) 2 , (CH 3 ) 3 SiOCH 3 , C 2 H 5 Si (OCH 3 ) 3 , (C 2 H 5 ) 2 Si (OCH 3 ) 2 , (C 2 H 5 ) 3 SiOCH 3 , C 8 Hi 5 Si (OC 2 H 5 ) 3 , C 8 Hi 5 Si (OCH 3 ) 3 , (H 3 C) 3 SiNHSi (CH 3) 3, and
  • step b) and / or c) and / or d separation of fractions of the granules of different size from one another can take place such that only one or more fractions having certain particle sizes are separated and further be used.
  • Tamping density of the product was adjusted by the contact pressure, the roller speed and the applied negative pressure.
  • the compacted granules were first fed to an oscillating sieve mill with a mesh size of 3150 ⁇ m (manufacturer
  • the desired fractionation of the particle fractions for example, from 200 to 1 190 ⁇ or from 1 190 to 3150 ⁇ .
  • a vibrating sieve from Sweco, Model LS18S was used.
  • the mixture of AEROSIL ® 300 silicon carbide was previously prepared with a compressor roll Grenzebach (Vacupress VP 160/220) compacted.
  • Tamped density of the resulting granules was adjusted by the contact pressure, the roller speed and the applied negative pressure.
  • the applied vacuum was less than 300 mbar, absolute.
  • the rolling speed was 5 rpm and the pressing pressure was 2000 N.
  • the subsequent thermal curing took place in a chamber furnace XR 310 from Schröder Industrieöfen GmbH. For this purpose, several layers were treated with a bed of up to 5 cm in height with a temperature program. The temperature ramp was 300 K / h up to the target temperature of 950 ° C, the holding time was 3 hours, then the cooling (without active cooling) of the samples was carried out until removal.
  • HMDS hexamethyldisilazane
  • the thermally cured granules were first fed to an oscillating sieve mill with a mesh size of 3150 ⁇ m
  • the ultrasound measurements were carried out with the Retsch Horiba LA-950 Laser Particle Size Analyzer from Horiba. Measuring method: Mie scattering theory, measuring range: 0.5 to 5000 [Ji m. A similar method is described in WO 2014001088 A1. The samples were pretreated prior to measurement by manually sieving particles larger than 2500 ⁇ so as not to clog the analyzer's gap. In each case 1 g (depends on the
  • Figure 1 shows the decrease in the dso quotient (dimensionless plotted on the y-axis) during the sonication time (in seconds plotted on the x-axis).
  • the individual measurement series are identified as follows:
  • Comparable particle size fractions show that the granules of Examples 1 and 2 according to the invention have a better mechanical stability than the products of Comparative Examples 1 and 4 with less than 260 g / l tamped density.
  • the granules according to the invention show a comparable or even better mechanical stability than the materials from Comparative Examples 2 and 3 with tamping densities higher than 350 g / l. Accordingly, the

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  • Manufacturing & Machinery (AREA)
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  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Thermal Sciences (AREA)
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Abstract

La présente invention concerne un matériau granulaire thermo-isolant comprenant de la silice hydrophobe, au moins un agent opacifiant IR, présentant une masse volumique après tassement allant jusqu'à 250 g/L et une contrainte de compression selon la norme DIN EN 826:2013 à 50 % d'écrasement de 150 à 300 ou supérieure à 300 kPa. L'invention concerne également un procédé pour sa fabrication et pour son utilisation à des fins d'isolation thermique.
EP18700427.0A 2017-01-18 2018-01-18 Matériau granulaire thermo-isolant et son procédé de fabrication Pending EP3571173A1 (fr)

Applications Claiming Priority (4)

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EP17151995 2017-01-18
US201762482943P 2017-04-07 2017-04-07
EP17167175 2017-04-20
PCT/EP2018/051142 WO2018134275A1 (fr) 2017-01-18 2018-01-18 Matériau granulaire thermo-isolant et son procédé de fabrication

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EP (1) EP3571173A1 (fr)
JP (1) JP7050810B2 (fr)
CN (1) CN110446692A (fr)
MX (1) MX2019008516A (fr)
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MX2021000626A (es) 2018-07-18 2021-03-25 Evonik Operations Gmbh Procedimiento de hidrofobizacion de cuerpos de material de aislamiento conformados a base de silice a presion ambiental.
EP3870537A1 (fr) 2020-01-14 2021-09-01 Evonik Operations GmbH Matériau granulaire hydrophobe à base de silice présentant une polarité accrue
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JP7050810B2 (ja) 2022-04-08
US11565974B2 (en) 2023-01-31
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US20200031720A1 (en) 2020-01-30
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