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WO2008065687A2 - Procédé de fabrication d'articles thermoformés expansés - Google Patents

Procédé de fabrication d'articles thermoformés expansés Download PDF

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Publication number
WO2008065687A2
WO2008065687A2 PCT/IT2007/000708 IT2007000708W WO2008065687A2 WO 2008065687 A2 WO2008065687 A2 WO 2008065687A2 IT 2007000708 W IT2007000708 W IT 2007000708W WO 2008065687 A2 WO2008065687 A2 WO 2008065687A2
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WO
WIPO (PCT)
Prior art keywords
mixture
process according
glass
weight
goods
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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.)
Ceased
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PCT/IT2007/000708
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English (en)
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WO2008065687A3 (fr
Inventor
Rossano Ragazzini
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Individual
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Individual
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Priority to EP20070827759 priority Critical patent/EP2076473A2/fr
Publication of WO2008065687A2 publication Critical patent/WO2008065687A2/fr
Publication of WO2008065687A3 publication Critical patent/WO2008065687A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
    • C03C11/007—Foam glass, e.g. obtained by incorporating a blowing agent and heating
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    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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Definitions

  • the present invention relates to a process for making expanded thermoformed goods.
  • a process according to the present invention comprises the step of mixing glass particles with an expanding agent and in submitting the mixture so obtained to a baking process, as indicated in claim 1. Further features of the present invention are the subject of the dependent claims.
  • a process according to the present invention consists in mixing glass particles with an expanding agent and submitting this mixture to a baking process.
  • the quantity of glass to be used is comprised between 90 % and 99 % while the quantity of expanding agent to be used is comprised between 1 and 5 % by weight of the mixture.
  • the glass can be flour-like or sand-like.
  • a gypsum mortar is prepared using glass flour (granulometry 50-100 ⁇ ) for 60-70% by weight and
  • the gypsum acts both as a crude binding agent, ensuring high formability even when moulds having particularly complex shapes are used, and as an expanding agent.
  • the baking temperature can be comprised between 900 and 1100° C in relation to the quantity of expanding agent used to realise the mixture.
  • the temperature of 900° C is reached in about 2 hours, then the material is brought to a temperature of 1100 C in about 1 hour.
  • An air cooling phase of the product removed from the furnace follows this step.
  • the mixture components are the same as those of the previous example and powdered gypsum is used instead of a gypsum mortar, and the baking process takes place in a muffle furnace. In this case, however, it is preferable to use a gypsum quantity comprised between 2 and 10 %.
  • Example 3 The composition mentioned in example 1 stays the same and, if a minor formability of the mixture is accepted, the glass can be sand-like with an irregular granulometry, instead of being flour-like.
  • Example 4 Potassium permanganate (KMnO 4 ) is used in a quantity- comprised between 1% and 5% by weight of the mixture, CaSO 4 in a quantity comprised between 20% and 30% by weight of the mixture, 70-74% of glass flour, and 5 % organic fibres (for example paper fibers) by weight of the mixture which constitute a carbonizable agent.
  • the mixture is brought to a temperature of 800 0 C in 1 hour, then to 950 ° C in 20-30 minutes.
  • the potassium permanganate frees oxygen, and there is the formation of manganese (MnO 2 ) and manganese silicate.
  • the oxygen bubbles determine an increase in volume of the material being baked.
  • the manganese acts as a bleaching agent if its percentage is inferior to 3%. If greater amounts of the indicated expanding agent are used, the finished product will take a violettish coloration.
  • a mixture containing 10-30% by weight of CaSO 4 , 2-5% of KAl(SO 4 ), 5-10% of paper fibers and glass particles (in a quantity necessary to reach 100% by weight of the mixture) is prepared.
  • the mixture is then brought to a temperature of 900 ° C in two hours and then to a temperature of 950-1000 ° C in 20 minutes.
  • a cooling phase follows this phase (the cooling can be either rapid or slow) . In this case, a vitreous sponge-like product is obtained.
  • a mixture containing 10-30% by weight of CaSO 4 , 2-5% of BaSO 4 , 5-10% of paper fibers and glass particles (in a quantity necessary to reach 100 % by weight of the mixture) is prepared.
  • the mixture is brought to a temperature of 900°C in two hours and then to 1000-1050 ° C in 30 minutes.
  • a cooling phase follows this phase (the cooling can be either rapid or slow) .
  • a vitreous sponge-like product is obtained like in the case of example 5 but with gaseous bubbles having a minor volume.
  • BaSO 4 facilitates continuity in the formation of gaseous bubbles during the glass fusion above 1000 ° C and it is preferably used in a mixture with high- temperature-fusing glass.
  • Example 7 A mixture containing 10-30 % by weight of CaSO 4 , 2-5 % of NaSO 4 , 5-10% of paper fibres and glass particles (in a quantity necessary to reach 100% by weight of the mixture) is prepared. The mixture is brought to a temperature of 800 ° C in 3 hours and then to a temperature of 1050 ° C in an hour. An air cooling follows. Na 2 SO 4 facilitates continuity in the formation of gaseous bubbles during the glass fusion between 750 ° C and 1050 ° C and it is preferably used in a mixture with low-temperature- fusing glass.
  • Example 8 A mixture containing 10-30 % by weight of CaSO 4 , 2-5 % of NaSO 4 , 5-10% of paper fibres and glass particles (in a quantity necessary to reach 100% by weight of the mixture) is prepared. The mixture is brought to a temperature of 800 ° C in 3 hours and then to a temperature of 1050 ° C in an hour. An air cooling follows. Na 2 SO 4 facilitates continuity in the formation of gas
  • a mixture containing 10-30 % by weight of CaSO 4 , 2- 5% of MgSO 4 , %-10% of paper fibers and glass particles (in a quantity necessary to reach 100% by weight of the mixture) is prepared.
  • the mixture is brought to a temperature of 800 C in 3-4 hours and then to 1050 ° C in 2 hours.
  • An air cooling follows.
  • the effect of MgSO 4 is analogous to that of CaSO 4 described in Example 1.
  • the mixture is brought to a temperature of 850 ° C in 3 hours and then to 1050 0 C in 1 hour.
  • An air cooling follows.
  • the presence of copper determines an increase in the viscosity range of the glass, as, during the process, copper silicate is formed. This helps holding of the most voluminous gaseous bubbles .
  • a mixture containing 10-30% by weight of CaSO 4 , 2-5 % of FeSO 4 , 5-10% of paper fibers and glass particles (in a quantity necessary to reach 100 % by weight of the mixture) is prepared.
  • the mixture is brought to a temperature of 850 ° C in 3 hours and then to 1000 ° C in 2 hours.
  • An air cooling follows.
  • the presence of FeSO 4 determines an effect which is opposite to that of CuSO 4 indicated in Example 9, i.e. it increases the fluidity range of the glass and reduces the viscosity thereof.
  • Example 11 A mixture containing 10-30% by weight of CaSO 4 , 2- 5% of ZnSO 4 , 5-10 % of paper fibers and glass particles (in a quantity necessary to reach 100% by weight of the mixture) is prepared.
  • Example 12 The mixture is brought to a temperature of 850 0 C in 4 hours and then to 1050 0 C in 1 hour. An air cooling follows.
  • the effect determined by the presence of ZnSO 4 in the mixture is analogous to that indicated in Example 10 as regards the fluidity of glass, but this substance acts as a structuring agent, since zinc silicates are formed during baking.
  • Example 12 The effect determined by the presence of ZnSO 4 in the mixture is analogous to that indicated in Example 10 as regards the fluidity of glass, but this substance acts as a structuring agent, since zinc silicates are formed during baking.
  • a mixture containing 40-50% of CaSO 4 , 1-5 % by weight of the mixture of paper fibers and glass particles in a quantity necessary to reach 100 % by- weight of the mixture) is prepared.
  • the mixture is brought to a temperature of 1000-1100 0 C in about 8 hours and kept at this temperature for 30-60 minutes.
  • An air cooling follows.
  • the thus obtained product features a mixed alveolar structure (with open and closed alveoli) and is more thermally refractory than the products in the previous examples and it maintains good mechanical properties and features a higher density.
  • the time indicated in the previous embodiments can obviously vary in relation to the mass submitted to baking.
  • the expanding agent in order to ensure a more uniform distribution of cavities in the finished product, it is foreseen to premix the expanding agent with carbon or with a relatively low-temperature carbonizable substance (i.e. carbonizable at 300- 400° C ), such as sugary substances, sawdust, vegetable wastes or paper fibers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Glass Compositions (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé destiné à la production d'articles thermoformés expansés, consistant à préparer un mélange, à le placer dans un moule de formage, puis à le cuire. Le procédé se caractérise par le fait que ledit mélange comprend des particules de verre, du CaSO4, ainsi qu'une substance carbonisable.
PCT/IT2007/000708 2006-10-18 2007-10-10 Procédé de fabrication d'articles thermoformés expansés Ceased WO2008065687A2 (fr)

Priority Applications (1)

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EP20070827759 EP2076473A2 (fr) 2006-10-18 2007-10-10 Procédé de fabrication d'articles thermoformés expansés

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ITFI20060252 ITFI20060252A1 (it) 2006-10-18 2006-10-18 Procedimento per realizzare manufatti termoformati espansi
ITFI2006A000252 2006-10-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3939946A1 (fr) * 2020-07-13 2022-01-19 Alfred Oberender Mélange pour matériaux de construction

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR936885A (fr) * 1945-12-21 1948-08-02 Pittsburgh Corning Corp Perfectionnements à la formation des corps cellulaires
GB2117753A (en) * 1982-04-06 1983-10-19 Printsulate Limited Compositions
DE19510865A1 (de) * 1995-03-16 1996-09-26 Protekum Umweltinstitut Gmbh O Verfahren zur Herstellung von Wertstoffen aus einem Altpapier-Restgemisch (Reject)
DE19805379A1 (de) * 1997-07-29 1999-08-12 Hermsdorfer Inst Tech Keramik Verfahren zur Herstellung eines Ziegelsteines mit hoher Wärmedämmwirkung und niedriger Wasserdampfdiffusionswiderstandszahl
JP4878734B2 (ja) * 2004-01-08 2012-02-15 ニチハ株式会社 無機質板の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3939946A1 (fr) * 2020-07-13 2022-01-19 Alfred Oberender Mélange pour matériaux de construction

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WO2008065687A3 (fr) 2008-07-17
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