WO2003072876A1 - Agregat de fibres ceramiques - Google Patents

Agregat de fibres ceramiques Download PDF

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Publication number
WO2003072876A1
WO2003072876A1 PCT/JP2003/002129 JP0302129W WO03072876A1 WO 2003072876 A1 WO2003072876 A1 WO 2003072876A1 JP 0302129 W JP0302129 W JP 0302129W WO 03072876 A1 WO03072876 A1 WO 03072876A1
Authority
WO
WIPO (PCT)
Prior art keywords
aggregate
fiber
ceramic fiber
fibers
ceramic
Prior art date
Application number
PCT/JP2003/002129
Other languages
English (en)
Japanese (ja)
Inventor
Mamoru Shoji
Toshiaki Sasaki
Toshio Ito
Naoyuki Kagawa
Original Assignee
Mitsubishi Chemical Functional Products, Inc.
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 Mitsubishi Chemical Functional Products, Inc. filed Critical Mitsubishi Chemical Functional Products, Inc.
Publication of WO2003072876A1 publication Critical patent/WO2003072876A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration

Definitions

  • the present invention relates to a ceramic fiber assembly.
  • the ceramic fiber aggregate is usually melted in a melting furnace at a temperature close to 2000 ° C at a temperature of around 2000 ° C (melting method), and then centrifuged by a rotating plate or compressed air. It is manufactured by a method that converts into fibers by cooling at once.
  • the ceramic fiber aggregate obtained by the melting method as described above contains a large amount of unfibrillated particles during spinning. I Dog (hereinafter referred to as shot), and its proportion is usually 50% by weight. Reach.
  • the fiber structure becomes an amorphous amorphous glass structure because it is rapidly cooled from a molten state during fiberization.
  • Such a ceramic fiber aggregate is inexpensive, but is inferior to a crystalline alumina fiber in heat resistance 5 ′, and is further reduced in performance by a large amount of shot.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a novel ceramic fiber aggregate that maintains high fiber properties and has a short shot content power of 5 ′.
  • the gist of the present invention is an aggregate of ceramic fibers, is water-dispersible fiber ⁇ height is 1 4 0 m 1 / g Shiyotto content and above particle diameter 4 5 lambda m above 20% by weight or less in the ceramic fiber aggregate.
  • the ceramic fiber aggregate of the present invention is obtained by a melting method and contains alumina and silica as main components. That is, the ceramic fiber aggregate of the present invention is basically manufactured as a fiber aggregate by the above-described known melting method.
  • alumina and silica are the main components means that their content is 80% by weight or more. That is, the ceramic fiber of the present invention in order to enhance heat resistance, a small amount of C r 2 0 3, Z r 0 2 or the like may be added.
  • the ceramic fiber aggregate of the present invention has a bulk in water of 140 m 1 / g or more and a shot content of 45 ⁇ m or more in particle diameter of 20% by weight or less. Characterized.
  • the value of the “bulk height of the dispersion fiber in water” described above means a value measured by the following method. That is, 3 g of ceramic fiber is refined, put into a 1 L mesis cylinder (a commercially available standard product) having a diameter of 65.5 mm, and further added with 1 L of water and sufficiently sealed to obtain a fiber. After dispersing the mixture, the mixture is allowed to stand for 30 minutes and the bulk of the precipitated fiber is measured. The value obtained by converting the bulk of the obtained fiber per unit g was defined as the bulk height of the fiber dispersed in water. The lower the value of the bulk of the dispersed fibers in water, the shorter the fibers constituting the ceramic fiber aggregate.
  • the content of the “shot having a particle diameter of 45 ⁇ m or more” described above means a value measured by a method in accordance with JISR-3331.
  • the ceramic fiber aggregate of the present invention is obtained, for example, by a melting method, and has alumina and silica as main components and an alumina-silicon weight ratio of usually 30:70 to 60:40. It can be obtained by subjecting an aggregate of ceramic fibers to a wet defibration and then performing a de-shot process.
  • the above commercial products have shots with an alumina / silica weight ratio of approximately 50:50, an average fiber diameter of 2-3 m, and a size of 45 ⁇ 111 or more according to JISR-3311.
  • the amount is usually of the order of 50% by weight.
  • typical product forms of the above-mentioned commercial products include blanket and balta, but balta is preferable.
  • the fibers may become entangled by a heat treatment called needle punching or squeezing, and the wet defibration may not be performed sufficiently.
  • needle punching or squeezing a heat treatment that is used to satisfy the physical properties specified in the present invention.
  • an oil agent added to the fiber surface. Its purpose is to prevent dust from fibers and maintain the texture. Furthermore, in the case of blankets, it is added as a lubricant for punch needles during needle punching. Such an oil agent is added to the entire fiber at the stage of melt spinning. Therefore, a general blanket does not remain because the fiber is hardened by heat treatment after needle punching, but remains in the case of bulk.
  • a hydrophilic nonionic surfactant or a non-hydrophilic cationic surfactant is mainly used.
  • the above-mentioned oils have an adverse effect on the dispersibility of the fibers during wet unraveling. That is, when the oil agent is non-hydrophilic, the fibers repel water and are hardly dispersed in water. If the oil agent is hydrophilic, it foams in and further, the fibers and shots are dispersed in water, making shot separation difficult.
  • the ceramic fiber aggregate to be subjected to the above-described modification treatment is degreased before wet defibration.
  • the degreasing treatment is usually performed by heat treatment at 400 to 600 ° C. If the heat treatment temperature is lower than 400 ° C, the removal of the “oil” in the fiber becomes insufficient, and if it exceeds 600 ° C, there are problems such as thermal deterioration and fusion of the fiber. Failure occurs during defibration (dispersion of fibers) Wet defibration, no. It can be carried out using a device commercially available under the name of a refiner, a stirrer, a mixer, or the like for a loop.
  • the ratio of the fiber to water is usually 0.5 to 3% by weight, preferably 1 to 2% by weight. If the fiber concentration in the water is too high, the fibers will become entangled with each other and the dispersion of the fibers will not be successful, requiring long-term dispersion. As a result, there is a problem that the fiber length is shortened more than necessary. In addition, productivity force when the fiber concentration in the water is too low? Deteriorate.
  • the ceramic fiber aggregate is dissolved so that the bulk of the fibers dispersed in water is at least 140 ml / g and the content of the shot having a particle diameter of at least 45 ⁇ m is at most 20% by weight.
  • the fiber conditions are appropriately selected.
  • the bulk of the dispersion fiber in water is preferably 200 ml / g or more, and the upper limit is not particularly limited, but it is considered that it can be up to about 700 m1 / g.
  • the content of the shot having a particle diameter of 45 ⁇ m or more is preferably 10% by weight or less.
  • the lower limit is not particularly limited, but is usually about 5% by weight because excessive de-shot processing increases the possibility of shortening the fiber length more than necessary.
  • the shot 1 is removed from the unraveled fiber by sedimentation in water.
  • a separation method a liquid cyclone, a separation method using a floating sedimentation tank, or the like can be used.
  • the fiber concentration in the water is usually in the range of 1 to 2% by weight, preferably 0.2 to 1% by weight. If the fiber concentration is too high, shots separated from the fibers by dispersion and defibration will be mixed with the fibers and difficult to separate. What are the separation conditions? It is determined by the equipment used, the content of the shot in the fiber obtained, the yield of the fiber, and the like.
  • the ceramic fiber aggregate modified as described above needs to be dried depending on the application.
  • the ceramic fiber aggregate of the present invention may be subjected to a firing treatment.
  • the firing conditions vary depending on the type of fiber used, the type of heat treatment furnace, etc., but usually, mullite crystals are generated in the fiber at 900 to 1200 ° C (preferably 950 to 1100 ° C).
  • the temperature is usually 5 to 5 hours (preferably about 1 hour).
  • the size of the mrit crystal is measured by the Wi-son method based on X-ray diffraction, and calcined so that this value is usually 30 OA or less, preferably 20 OA or less, and more preferably 50 to 15 OA. To process.
  • the above-mentioned baking process is performed after the de-shot process.
  • the sheet can be processed before the firing treatment.
  • Such sheet processing can be performed by a method in which the ceramic fiber aggregate after the de-shock treatment is processed by a paper machine, a vacuum molding machine, or the like.
  • the present invention will be described in more detail with reference to examples.
  • the present invention is not limited to the following examples unless it exceeds the gist of the present invention.
  • the evaluation method and the aggregate of ceramic fibers used in the following examples are as follows.
  • the ceramic fiber aggregate was heat-treated at 600 ° C for 1 hour to remove the oil attached to the fiber surface before use.
  • the paper mat is cut to 5 Omm, and it is applied to a compression tester (Shimadzu “IS-500”) and compressed at a compression speed of 1 mm / min.
  • the load per unit area (kg / cm 2 ) was determined by dividing the compressive load by the mat area, and the relationship between the compressive density (g / cm 3 ) and the load (kg / cm 2 ) was determined.
  • Mats that provide high surface pressure have excellent resilience and are suitable for applications such as heat-resistant packing and cushioning materials.
  • the surface pressure as described above is usually about 6 kg / cm 2 or more, and up to about 12 kgZ cm 2 can be expected as the upper limit.
  • Measurement angle of reference material 26.6, 36.5, 39.4, 40.3, 42.4
  • TMA thermo-mechanical analysis
  • test fiber aggregate ((F) in Table 2) was added to 4.0 L of water and dispersed to form a 1% by weight slurry, and the slurry was mixed with a commercially available mixer (Model 34BL22 manufactured by Waring Co.) to 7800 The dispersion was further dispersed by rpm and dispersed for 2 minutes.
  • the fiber assembly (papermaking mat) obtained in Example 3 above was subjected to a heat treatment to test the high temperature properties.
  • Table 4 shows the results. Mullite crystal grains were detected in the paper-made mat that had been heat-treated above 950 ° C, and the heat resistance by TMA was greatly improved. In particular, in the case of a paper-made mat having a crystal grain size of 15 OA or less, the fiber did not deteriorate due to the heat treatment, and a high surface pressure could be maintained.
  • a short fiber contained in a large amount of fibers while maintaining an appropriate fiber length is provided.
  • removing the fibers it is possible to obtain a ceramic fiber aggregate having significantly improved physical properties.
  • Such a ceramic fiber aggregate is relatively inexpensive and, moreover, covers an intermediate temperature region between alumina fiber and ceramic fiber, so that it is suitable for applications such as heat-resistant packing and cushioning materials.
  • a gripping material for a catalytic converter of a vehicle exhaust gas purification device is exemplified.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Inorganic Fibers (AREA)

Abstract

L'invention concerne un agrégat de fibres céramiques, caractérisé en ce qu'il présente un étoffement de fibres à l'état dispersé dans de l'eau supérieur ou égal à 140 ml/g, et contient des charges d'injection dont les particules non fibreuses moyennes présentent un diamètre particulaire supérieur ou égal à 40 νm dans une teneur de 20 % en poids. Cet agrégat de fibres céramiques est considérablement retiré des charges d'injection, qui sont contenues à forte teneur dans un agrégat de fibres céramiques classiques, tout en maintenant une longueur de fibre appropriée, ce qui lui permet de convenir à une utilisation pour un emballage résistant à la chaleur, un matériau de rembourrage et analogue.
PCT/JP2003/002129 2002-02-27 2003-02-26 Agregat de fibres ceramiques WO2003072876A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-50904 2002-02-27
JP2002050904 2002-02-27

Publications (1)

Publication Number Publication Date
WO2003072876A1 true WO2003072876A1 (fr) 2003-09-04

Family

ID=27764291

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/002129 WO2003072876A1 (fr) 2002-02-27 2003-02-26 Agregat de fibres ceramiques

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WO (1) WO2003072876A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014115814A1 (fr) * 2013-01-23 2014-07-31 電気化学工業株式会社 Fibre d'alumine et agrégat de fibres d'alumine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952130A (en) * 1972-11-17 1976-04-20 United States Gypsum Company Mineral wool paper
GB1455563A (en) * 1972-11-29 1976-11-17 Ici Ltd Fibrous mater-als
JPS58208419A (ja) * 1982-04-30 1983-12-05 Ibiden Co Ltd セラミツク繊維綿状物中のシヨツト除去方法
US4532006A (en) * 1983-08-05 1985-07-30 The Flintkote Company Inorganic fiber mat using mineral wool and related process and apparatus
JPH0411091A (ja) * 1990-04-26 1992-01-16 Honshu Paper Co Ltd 無機ペーパーの製造方法及びその方法による無機ペーパー

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952130A (en) * 1972-11-17 1976-04-20 United States Gypsum Company Mineral wool paper
GB1455563A (en) * 1972-11-29 1976-11-17 Ici Ltd Fibrous mater-als
JPS58208419A (ja) * 1982-04-30 1983-12-05 Ibiden Co Ltd セラミツク繊維綿状物中のシヨツト除去方法
US4532006A (en) * 1983-08-05 1985-07-30 The Flintkote Company Inorganic fiber mat using mineral wool and related process and apparatus
JPH0411091A (ja) * 1990-04-26 1992-01-16 Honshu Paper Co Ltd 無機ペーパーの製造方法及びその方法による無機ペーパー

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014115814A1 (fr) * 2013-01-23 2014-07-31 電気化学工業株式会社 Fibre d'alumine et agrégat de fibres d'alumine
JPWO2014115814A1 (ja) * 2013-01-23 2017-01-26 デンカ株式会社 アルミナ質繊維及びアルミナ質繊維集合体

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