EP0618854A1 - Procede de fabrication de panneaux de fibres ou d'agglomeres - Google Patents

Procede de fabrication de panneaux de fibres ou d'agglomeres

Info

Publication number
EP0618854A1
EP0618854A1 EP93919235A EP93919235A EP0618854A1 EP 0618854 A1 EP0618854 A1 EP 0618854A1 EP 93919235 A EP93919235 A EP 93919235A EP 93919235 A EP93919235 A EP 93919235A EP 0618854 A1 EP0618854 A1 EP 0618854A1
Authority
EP
European Patent Office
Prior art keywords
catalyst
binder
fiberboard
chipboard
nco groups
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.)
Withdrawn
Application number
EP93919235A
Other languages
German (de)
English (en)
Inventor
Jürgen Dr. Kramer
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.)
KRAMER, JUERGEN, DR.
Original Assignee
KRAMER JUERGEN DR GLUNZ AG
Kramer Juergen Dr
Glunz AG
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 KRAMER JUERGEN DR GLUNZ AG, Kramer Juergen Dr, Glunz AG filed Critical KRAMER JUERGEN DR GLUNZ AG
Publication of EP0618854A1 publication Critical patent/EP0618854A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/703—Isocyanates or isothiocyanates transformed in a latent form by physical means
    • C08G18/705—Dispersions of isocyanates or isothiocyanates in a liquid medium
    • C08G18/706—Dispersions of isocyanates or isothiocyanates in a liquid medium the liquid medium being water
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1825—Catalysts containing secondary or tertiary amines or salts thereof having hydroxy or primary amino groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1875—Catalysts containing secondary or tertiary amines or salts thereof containing ammonium salts or mixtures of secondary of tertiary amines and acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
    • C08G18/6484—Polysaccharides and derivatives thereof
    • 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

Definitions

  • the invention relates to a process for the production of chipboard or fiberboard, in which lignose-cellulose-containing chips or fibers are glued with a binder containing NCO groups, shaped into a mat and pressed under the action of heat to the chipboard or fiberboard.
  • a particle board or fiber board bonded with a binder containing NCO groups advantageously has excellent moisture resistance and no formaldehyde emission resulting from binder. It turns out to be disadvantageous, however, that binders containing NCO groups have a lower adhesive effect than other binders, which also has to be activated by comparatively high temperatures and long pressing times when the chipboard or fiberboard is hot-pressed.
  • the invention is therefore based on the object of further developing a method of the type described at the outset such that stable chipboard or fiberboard can be obtained with a lower binder content and / or that the pressing times can be shortened and / or that the pressing temperatures can be reduced.
  • REPLACEMENT LEAF reactive groups in that they are chemically incorporated into the polyurethane foam and thus inactivated after the polyurethane reaction has been carried out.
  • tertiary amines are not known as catalysts which accelerate the hardening of the binder during hot pressing.
  • the US-PS 47 72 442 discloses a method of the type described above for the production of chipboard or fiberboard using a binder containing NCO groups, wherein a fatty substance is used as a release agent for the hot-pressed chipboard or fiberboard from the press plates of the hot press becomes.
  • the detaching aid is applied in an aqueous emulsion, to which triethanolamine is added as an emulsifier.
  • US Pat. No. 4,772,442 does not report any catalytic effects of triethanolamine with regard to the binder.
  • a binder additive for the production of aminoplast resin-bound chipboard and fibreboard is known.
  • the addition of the binder is said to improve the flame-retardant properties of the particle board or fiberboard without impairing its stability.
  • constituents of the binder additive are, for example, a water-soluble amine or polyamine and a further water-soluble compound with at least one organically bound hydroxyl group or a liquid alcohol. It is also possible to add isocyanate as the binder component containing NCO groups to the binder consisting essentially of aminoplast resin.
  • a person skilled in the art from DE-OS 34 38 735 cannot infer a catalytic effect of the amines or polyamines as such on the hardening of the binder. In particular, this does not result in a direct link between the amines and binders containing NCO groups, insofar as they are used solely as binders.
  • the object of the invention is achieved by adding a catalyst which accelerates a polyurethane reaction to the binder containing NCO groups.
  • various known catalysts which accelerate the polyurethane reaction in the production of polyurethane foams are suitable as an additive to the binder containing NCO groups used in the production of chipboard or fiberboard as reactive groups.
  • the maintenance of the adhesive effect of the binder during the open storage period of the glued chips or fibers, which was previously regarded as critical, has proven to be largely problem-free.
  • the binder can be applied to the chips or fibers in an aqueous suspension and / or emulsion, the catalyst being dissolved in the water.
  • a water-soluble catalyst has the particular advantage that it can be distributed finely and uniformly in the binder. Lower amounts of the generally high-priced catalyst are sufficient than if the catalyst is water-insoluble and has to be dispersed in the water.
  • the application of the binder containing NCO groups to the chips or fibers in the form of an aqueous suspension or emulsion is a common method in the production of chipboard and fiberboard. Likewise, the use of suspensions or emulsions is up
  • the catalyst would have to be added to the binder via the toluene.
  • the catalyst can have a hydroxyl group.
  • the hydroxyl group of the catalyst is u. a. an indication of the water solubility of the catalyst.
  • the catalyst can be chemically incorporated into the particle board or fiberboard during pressing.
  • a catalyst firmly integrated after hot pressing is chemically activated. This is of particular importance since the catalysts which accelerate a polyurethane reaction have almost completely irritating, in some cases even toxic, properties in the unbound state. However, this irritating or even toxic effect no longer comes into play after the catalytic converter has been chemically installed in the particle board or fiberboard.
  • the catalyst can be a tertiary amine.
  • Amines are the best known group of catalysts which accelerate a polyurethane reaction. It is precisely the tertiary amines which are found to be advantageous in the production of particleboard and fiberboard using a binder containing NCO groups. When the glued chips are hot-pressed, they are firmly built into the resulting bonds and thereby chemically inactivated if they have an NCO-reactive group. Secondary and primary amines are always bound in the binder containing NCO groups by means of an NH / NCO reaction.
  • the ether and aliphatic amines appear particularly suitable for carrying out the invention.
  • binding agents can be eliminated by using a blocked catalyst which can be activated by supplying heat.
  • a blocked catalyst which can be activated by supplying heat.
  • Such catalysts are also known per se to those skilled in the art for accelerating a polyurethane reaction.
  • a blocked catalyst which can be activated by the supply of heat can be achieved particularly simply by masking the catalyst with an acid.
  • the resulting reaction product with the catalyst disintegrates above the temperature which is characteristic of the open storage time, but is in the lower range of the temperatures reached during the hot pressing of the chips or fibers.
  • the catalyst can be used in a concentration between 2.0 and 0.001% by weight, based on the binder. In particular, concentrations between 0.5 and 0.005% by weight have proven to be suitable in the production of particle board and fiberboard using a binder containing NCO groups.
  • concentrations between 0.5 and 0.005% by weight have proven to be suitable in the production of particle board and fiberboard using a binder containing NCO groups.
  • the low proportions in which the catalyst accelerating a polyurethane reaction is sufficient to ignite the desired effect make it clear that, although it may be chemically incorporated into the reaction product, it is a true catalyst in the classic sense and is not an actual reaction partner.
  • the low concentrations required are also a prerequisite for the production of particle board and fiberboard using the catalyst to have economic advantages. It would be nonsensical if the achievable pressing time reduction of about 30% or the achievable pressing temperature reduction of about 30 K or the binder saving were more or completely offset by an increased financial use for the catalyst.
  • the binder can be a polyisocyanate, in particular polymeric 4,4'-methylene diisocyanate (PMDI).
  • PMDI polymeric 4,4'-methylene diisocyanate
  • NCO group-containing binder is in itself unchanged composition suitable for the production of particle board and fiberboard using a catalyst which accelerates a polyurethane reaction.
  • a commercially available catalyst which accelerated a polyurethane reaction was added to the binder.
  • the binder a polymeric 4-methylene diisocyanate (PMDI)
  • PMDI polymeric 4-methylene diisocyanate
  • the ratio of the proportions of water and PMDI was 1: 1.
  • the binder was a commercially available, unmodified polyisocyanate (Desmodur 1520 A, Bayer Leverkusen AG).
  • the catalyst which accelerated a polyurethane reaction was a water-soluble, tertiary amine (TEXACAT-DPA, Texaco-Chemical GmbH) and was added to the water content of the binder emulsion in a concentration which corresponded to 0.5% by weight of the PMDI content of the emulsion.
  • the binder emulsion thus enriched was used to glue chips in the usual way. After the formation of a mat from the chips and the pressing of the mat into a chipboard under the influence of heat, the quality of the resulting chipboard was examined as a function of the pressing time. Even when the pressing time falls below the usual pressing time by approx. 25%, no drops in quality impairing the commercial ability of the particle board have been observed. Instead, there were improved mechanical properties of the chipboard assessed, which still occurred significantly below the usual pressing time. With regard to the open storage time, up to 30

Abstract

Selon un procédé de fabrication de panneaux de fibres ou d'agglomérés, on ajoute à un liant contenant des groupes NCO un catalyseur accélérant la réaction du polyuréthanne. On colle avec ce liant des fibres ou des agglomérés contenant de la lignocellulose, avec lesquels on façonne ensuite une natte qui est comprimée sous effet de la chaleur jusqu'à former un panneau de fibres ou d'agglomérés.
EP93919235A 1992-09-03 1993-09-01 Procede de fabrication de panneaux de fibres ou d'agglomeres Withdrawn EP0618854A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4229396 1992-09-03
DE19924229396 DE4229396C2 (de) 1992-09-03 1992-09-03 Verfahren zur Herstellung von Span- oder Faserplatten
PCT/EP1993/002358 WO1994005475A1 (fr) 1992-09-03 1993-09-01 Procede de fabrication de panneaux de fibres ou d'agglomeres

Publications (1)

Publication Number Publication Date
EP0618854A1 true EP0618854A1 (fr) 1994-10-12

Family

ID=6467120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919235A Withdrawn EP0618854A1 (fr) 1992-09-03 1993-09-01 Procede de fabrication de panneaux de fibres ou d'agglomeres

Country Status (4)

Country Link
EP (1) EP0618854A1 (fr)
CA (1) CA2122368A1 (fr)
DE (1) DE4229396C2 (fr)
WO (1) WO1994005475A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9417502D0 (en) * 1994-08-31 1994-10-19 Smith & Nephew Water curable compositions
DE19646879A1 (de) * 1995-11-23 1997-05-28 Henkel Kgaa Einkomponenten-Polyurethan-Reaktionsklebstoff
DE19603330C1 (de) * 1996-01-31 1997-06-05 Bayer Ag Verfahren zur Herstellung von Holzwerkstoffen mit Polyisocyanat-Bindemitteln unter Mitverwendung von latenten, wärmeaktivierbaren Katalysatoren
EP1161498A1 (fr) * 1999-02-08 2001-12-12 Sappi Limited Procede et produit se rapportant au bois d'oeuvre
DE10047485A1 (de) 2000-09-26 2002-04-11 Bayer Ag Lagerstabile latente Katalysatoren enthaltende Isocyanat-Bindemittel
US9631058B2 (en) 2013-09-03 2017-04-25 The Willamette Valley Company Composite wood particulate products with aldehyde-free adhesives and method for making same
DE102015210569A1 (de) * 2015-06-09 2016-12-15 Georg-August-Universität Göttingen Stiftung Öffentlichen Rechts Erhöhung der Reaktivität von Isocyanatklebstoffen durch Amin-/Ammoniumverbindungen
EP4015173B1 (fr) 2020-12-21 2023-09-06 Georg-August-Universität Göttingen Augmentation de la réactivité des adhésifs isocyanate à l'aide des composés d'ammonium

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA794435A (en) * 1965-11-27 1968-09-10 A. Sharp John Particle board prepared with a polyisocyanate-pine resin extract adhesive
GB1309075A (en) * 1969-04-02 1973-03-07 Gen Foam Products Production of moulded articles and board
US4101466A (en) * 1976-12-01 1978-07-18 Texaco Development Corp. Bis (dimethylaminopropyl)-amine derivatives as polyurethane catalysts
DE2711958B2 (de) * 1977-03-18 1981-08-13 Bayer Ag, 5090 Leverkusen Binde- oder Imprägnierungsmittel für lignocellulosehaltige Materialien
EP0039137A1 (fr) * 1980-04-30 1981-11-04 Imperial Chemical Industries Plc Réactions d'isocyanate
DE3328662A1 (de) * 1983-08-09 1985-02-21 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von presswerkstoffen mit polyisocyanat-bindemitteln unter mitverwendung von latenten, waermeaktivierbaren katalysatoren
US4609513A (en) * 1984-08-15 1986-09-02 Jim Walter Research Corp. Binder composition for manufacture of fiberboard
DE4200324A1 (de) * 1992-01-09 1993-07-15 Bayer Ag Verwendung eines isocyanatgruppen aufweisenden sumpfprodukts als bindemittel bei der verpressung von substraten zur herstellung von presswerkstoffen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9405475A1 *

Also Published As

Publication number Publication date
DE4229396A1 (de) 1994-03-10
WO1994005475A1 (fr) 1994-03-17
CA2122368A1 (fr) 1994-03-17
DE4229396C2 (de) 1997-06-05

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