WO1980000142A1 - Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques - Google Patents

Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques Download PDF

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Publication number
WO1980000142A1
WO1980000142A1 PCT/SE1978/000014 SE7800014W WO8000142A1 WO 1980000142 A1 WO1980000142 A1 WO 1980000142A1 SE 7800014 W SE7800014 W SE 7800014W WO 8000142 A1 WO8000142 A1 WO 8000142A1
Authority
WO
WIPO (PCT)
Prior art keywords
cellulose
aldehyde
radiation
linking
cross
Prior art date
Application number
PCT/SE1978/000014
Other languages
English (en)
Inventor
A Akesson
T Reitberger
Original Assignee
A Akesson
T Reitberger
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 A Akesson, T Reitberger filed Critical A Akesson
Priority to PCT/SE1978/000014 priority Critical patent/WO1980000142A1/fr
Priority to DE19782857545 priority patent/DE2857545A1/de
Priority to GB8005428A priority patent/GB2039919B/en
Publication of WO1980000142A1 publication Critical patent/WO1980000142A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission

Definitions

  • the effect caused by the radiation can be influenced in some way, by exposing the polymer to said radiation in the presence of various additives, for example in a manner such that a. material which has been decomposed can also be re-linked and the properties thereof improved thereby. Further, it has been found that the presence of air when irradiating the material also has a certain significance, since in many cases the oxygen accelerates the decomposition of the material .
  • cellulose, cellulose derivatives and various natural cellulose composites belong to those polymeric materials most sensitive to radiation. If one excepts an insignificant positive effect at very small doses, i.e. ⁇ 10 krad, the mechanical properties of these materials are greatly impaired with increasing doses of radiation. It is also known that the properties of a plurality of condensation polymers between formaldehyde and urea, melamine or different phenol types, are impaired by radiation.
  • the present invention is based on the surprising discovery that chipboard or particle board bonded with formaldehyde-urea-resin exhibits highly improved mechanical properties subsequent to exposing the board to radiation.
  • the invention relates to a method of manufacturing bonded products which may be comprised fully or partially of cellulose or cellulose derivative, e.g. saw dust, wood chips, paper or vegetable fibres, the adhesive used being a condensation resin between an aldehyde, e.g. formaldehyde, and urea, melamine or a phenol type, and its widest aspect is mainly characterised by the fact that the product is irradiated to at most 5 Mrad with ionising radiation, the material undergoing a certain degree of cross-linking and residual quantities of uncured adhesive substances being reduced simultaneously therewith.
  • One Mrad corresponds to an amount of energy taken up in the material of 10 Joule/g or 10 Ws/g.
  • the present invention constitutes a significant step forward in this respect, owing to the fact that, in addition to improving the mechanical properties of the products, the radiation also contributes to reducing the residual content of aldehyde in the material.
  • the invention can also be applied together with various additives containing those functional groups which experience has shown will improve the extent to which cross-linking takes place when the material is subjected to radiation.
  • An example of such an additive is hydrocarbon with olefinic, acrylic or other comparable groups. It also lies within the scope of the invention to modify the adhesive substance itself, in a manner such that these groups are chemically bound to one or more of the components of the resin.
  • test rods measuring 60 x 13.9 x 16 mm were manufactured from the plates and impact tested at a distance of 46.8 mm between the points of impact.
  • the plates were irradiated at room temperature and exposed to the effect of oxygen in the air.
  • the dosing rate was approximately 0.04 krad/s.
  • the material may also be irradiated at elevated temperatures and at other dosing rates than those mentioned here. Slightly improved effects can be expected, in actual fact, when the dosing rate is increased, owing to the fact that the extent to which linking takes place is then more pronounced.
  • the material may be irradiated during the manufacture of the bonded product or in immediate conjunction therewith. Alternatively the material may be irradiated at a later stage, for example when the product is substantially finished and ready for use, or even shortly after the material has been put into use.
  • the irradiating operation - if it has not previously been carried out - may be undertaken when the semi-manufacture is converted to the final product.
  • the irradiating operation can be carried out either with the intention of influencing the surface layer of the material or in a manner such as to cause the radiation to pass completely through the material.
  • it is an advantage to use a less expensive and simpler type of accelerator

Abstract

Dans une methode de fabrication de produits agglomeres composes completement ou partiellement de cellulose ou d'un derive cellulosique, tel que la sciure, les copeaux de bois, le papier ou les fibres vegetales, on utilise une resine de condensation d'un aldehyde, de preference un formaldehyde, et de l'uree, du type melamine ou aphenol comme moyen d'addition. Le produit est irradie a au plus 5 M rad avec une radiation ionisante. Le materiau subit ensuite une certaine reticulation. Les quantites residuelles de substances adhesives non-traitees sont reduites en meme temps. La dose de radiation est reglee de maniere que les quantites residuelles d'aldehyde dans les materiaux soient reduites. De preference, la quantite residuelle de formaldehyde dans le materiau est egalement reduite. En ajoutant des additifs contenant des groupes olefinique, acrylique ou autres groupes semblables, on augmente le taux de la reticulation.
PCT/SE1978/000014 1978-07-06 1978-07-06 Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques WO1980000142A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/SE1978/000014 WO1980000142A1 (fr) 1978-07-06 1978-07-06 Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques
DE19782857545 DE2857545A1 (de) 1978-07-06 1978-07-06 A method of manufacturing bonded products of cellulose or cellulose derivatives
GB8005428A GB2039919B (en) 1978-07-06 1978-07-06 Method of manufacturing bonded products of cellulose or cellulose derivatives

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/SE1978/000014 WO1980000142A1 (fr) 1978-07-06 1978-07-06 Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques
WOSE78/00014 1978-07-06

Publications (1)

Publication Number Publication Date
WO1980000142A1 true WO1980000142A1 (fr) 1980-02-07

Family

ID=20333567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1978/000014 WO1980000142A1 (fr) 1978-07-06 1978-07-06 Methode de fabrication de produits agglomeres de cellulose ou de derives cellulosiques

Country Status (3)

Country Link
DE (1) DE2857545A1 (fr)
GB (1) GB2039919B (fr)
WO (1) WO1980000142A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196342B (en) * 1986-10-14 1990-06-27 Borden Inc Manufacture of fibreboard
WO1999012711A1 (fr) * 1997-09-05 1999-03-18 Fritz Egger Gmbh & Co. Procede et dispositif pour produire des corps moules a partir de materiau broye
EP3081307A1 (fr) * 2005-03-24 2016-10-19 Xyleco, Inc. Procédé de fabrication d'un composite

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668133A (en) * 1953-04-13 1954-02-02 United Shoe Machinery Corp Adhesive bonding processes
US3140197A (en) * 1959-04-01 1964-07-07 Heberlein & Co Ag Finished textile and method of producing same
GB1223760A (en) * 1967-04-04 1971-03-03 Weyerhaeuser Co Process of bonding an impregnated overlay material to a substrate material
SE403583B (sv) * 1977-01-07 1978-08-28 Akesson Arne Sett vid tillverkning av limmade produkter av cellulosa eller ett cellulosaderivat

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077417A (en) * 1958-02-05 1963-02-12 Dow Chemical Co Stabilization of wood and wood products with acrylic-like compounds
CH528957A (de) * 1969-06-04 1972-10-15 Lonza Ag Verfahren zur Herstellung von cellulosehaltigem Material mit verbesserter Abriebfestigkeit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668133A (en) * 1953-04-13 1954-02-02 United Shoe Machinery Corp Adhesive bonding processes
US3140197A (en) * 1959-04-01 1964-07-07 Heberlein & Co Ag Finished textile and method of producing same
GB1223760A (en) * 1967-04-04 1971-03-03 Weyerhaeuser Co Process of bonding an impregnated overlay material to a substrate material
SE403583B (sv) * 1977-01-07 1978-08-28 Akesson Arne Sett vid tillverkning av limmade produkter av cellulosa eller ett cellulosaderivat

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196342B (en) * 1986-10-14 1990-06-27 Borden Inc Manufacture of fibreboard
WO1999012711A1 (fr) * 1997-09-05 1999-03-18 Fritz Egger Gmbh & Co. Procede et dispositif pour produire des corps moules a partir de materiau broye
EP3081307A1 (fr) * 2005-03-24 2016-10-19 Xyleco, Inc. Procédé de fabrication d'un composite

Also Published As

Publication number Publication date
GB2039919B (en) 1983-02-09
GB2039919A (en) 1980-08-20
DE2857545A1 (de) 1980-11-27

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