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
  • C08G18/28—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
  • C08G18/6492—Lignin containing materials; Wood resins; Wood tars; Derivatives thereof
• • 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
  • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
• • 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
  • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
  • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
• • 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
  • C08G18/1833—Catalysts containing secondary or tertiary amines or salts thereof having ether, acetal, or orthoester 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
  • C08G18/20—Heterocyclic amines; Salts thereof
  • C08G18/2009—Heterocyclic amines; Salts thereof containing one heterocyclic ring
  • C08G18/2018—Heterocyclic amines; Salts thereof containing one heterocyclic ring having one nitrogen atom in the ring
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/302—Water
• • 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 wood-based materials by hot pressing of lignocellulose-containing materials glued with polyisocyanates as binders using amine catalysts which are stable in polyisocyanates.
• Wood materials such as Particle boards, composite boards or other shaped bodies are usually manufactured by taking the inorganic or organic raw material, e.g. a mass of wood chips, wood fibers and / or other lignose cellulose-containing material, with polyisocyanates and water, optionally polyols or other binders such as urea-formaldehyde or phenol / formaldehyde resins, hot-pressed as a so-called mixed gluing.
• polyisocyanates as binders improves the stability and moisture behavior of the
• polyisocyanates have as binders, such as e.g. disclosed in DE-OS 21 09 686, far-reaching procedural advantages.
• EP-A 133 680 discloses a process for producing wood-based materials using polyurethanes as binders, in which tertiary or quaternary ammonium phosphonates or quaternary ammonium phosphates are used as heat-activatable catalysts.
• tertiary or quaternary ammonium phosphonates or quaternary ammonium phosphates are used as heat-activatable catalysts.
• the shortening of the pressing time that can be observed when using these catalysts is not yet sufficient for an economical process run-through.
• DE-OS 196 03 330 describes a process for the production of wood-based materials with polyisocyanates as binders using a latent catalyst system, in which ammonium salts are used as the catalyst, which are obtained by reacting amines with malonic acid.
• These activated binders are effective press time shorteners and work even at high cutting temperatures. Due to their poor storage stability in isocyanates, however, separate metering of the catalyst to the isocyanate is necessary directly before the gluing. This separate dosing entails additional equipment costs and possible sources of error in production.
• the invention relates to a process for the production of wood-based materials by hot pressing of lignocellulose-containing materials glued with storage-stable binders, amine catalysts containing as binders
• Polyisocyanates are used.
• the amine catalysts to be used according to the invention are preferably those which contain dimol holino compounds.
• Dimorpholinodiethyl ether and dimorpholinopolyethylene glycol are particularly preferred.
• Dimethylphino compounds have been proposed variously as storage-stable additives to moisture-curing MDI prepolymers or PMDI epoxy resins (EP-A 226 287, EP-A 668 302, EP-A 732 385, US-A 5 075 405, EP- A 811 645 or WO 94/18265); However, their use in unmodified isocyanate for the production of storage-stable binders for the production of wood-based materials by hot pressing was hitherto unknown.
• the binders generally contain 0.01 to 30% by weight of catalyst, based on isocyanate. In a preferred variant, they contain 0.02 to 2% by weight, particularly preferably 0.05 to 1% by weight.
• the addition of the catalyst to the isocyanate and the subsequent mixing must take place with the exclusion of moisture.
• the mixed binder system can then be stored at temperatures of up to 40 ° C for at least two months and can also be exposed to temperatures of up to 60 ° C for a short time without impairing the properties of the binder.
• Suitable isocyanate components when carrying out the process according to the invention are aliphatic, cycloaliphatic, araliphatic, aromatic and heterocychic polyisocyanates, as described by W. Siefken in Justus Liebigs Annalen der Chemie 562, pp. 75-136, for example those of the formula
• n 2 to 4 preferably 2
• Q is an aliphatic hydrocarbon residue with 2 to 18, preferably 6 to 10 C atoms, a cycloaliphatic hydrocarbon residue with 4 to 23, preferably 5 to 13 C atoms, an aromatic hydrocarbon residue with 6 to 23, preferably 6 to 13 C atoms, or an araliphatic hydrocarbon radical with 8 to 15, preferably 8 to 13, carbon atoms,
• the technically easily accessible polyisocyanates e.g. 2,4- and 2,6-tolylene diisocyanate as well as any mixtures of these isomers (“TDI”), and particularly preferably polyphenyl-polymethylene polyisocyanates, such as those produced by aniline-formaldehyde condensation and subsequent phosgeny (“crude MDI”) , If necessary, the polyisocyanates used can also be modified.
• Highly nuclei isocyanates of the diphenylamine diisocyanate series (pMDI types) are particularly preferably used as the polyisocyanate component.
• prepolymers having terminal isocyanate groups and having an average molecular weight of about 275 to 2,000 as obtained by reacting higher molecular weight and / or low molecular weight polyols with an excess of polyisocyanate in a manner known per se.
• Suitable polyols are all higher molecular weight polyols customary in polyurethane chemistry, in particular two to eight hydroxyl group-containing compounds, especially those having a molecular weight of 400 to 10,000, preferably 550 to 5,000, for example at least two, generally two to eight, but preferably two up to four hydroxyl-containing polyesters, polyethers, polythioethers, polyacetals, polycarbonates and polyesteramides, as are known per se for example for the production of homogeneous and cellular polyurethanes.
• Suitable lignocellulose-containing raw materials that can be bound with the polyisocyanate activator formulation according to the invention are, for example, wood,
• the material can be in the form of granules, beaches, chips, fibers or flour and have a water content of e.g. 0 to 35% by weight, preferably 5 to 25% by weight.
• the binder is added in an amount of 1 to 100% by weight, preferably 2 to 12% by weight, and - generally under the action of pressure and heat - pressed into sheets or moldings.
• multi-layer panels or molded parts can be produced from veneers, papers or fabrics. Even multi-layer panels or molded parts made of veneer and strip, strip or rod middle layers, so-called
• Blockboards can be produced according to the invention by treating the veneers with the isocyanate activator formulation as described above and then pressing them with the middle layers - generally at elevated temperature and pressure. Temperatures of 80 to 250 ° C., particularly preferably 100 to 220 ° C., are preferably maintained. The initial pressure here is preferably between 5 and 150 bar; in the course of the pressing process, the pressure usually drops to around 0.
• polyisocyanate activator formulations can also be combined with the polyhydroxyl compounds described above in an NCO / OH
• Ratio of 1.1: 1 to 10: 1, preferably 1.5: 1 to 5: 1, are used. It is possible to use the two components separately or as a reactive mixture. Such combinations of polyisocyanate and polyhydroxyl compounds are of practical importance as binders, for example in the binding of cork pellets. It is also possible to use blowing agents known per se in an amount of about 0.5 to 30% by weight, based on binder or impregnating agent and / or other foaming or chemical reaction between polyisocyanates, hgnocellulose-containing material and optionally additives influencing polyhydroxyl compounds, such as stabilizers, in an amount of 0.05 to 10% by weight, based on binder or impregnating agent.
• the polyisocyanate activator formulations to be used according to the invention as binders can also be combined with the aqueous solutions of condensation products made from formaldehyde with urea and / or melamine and / or phenol, which have been predominantly used in the wood-based panel industry (mixed gluing), but also with others, so far less usual binders and impregnating agents, such as Sulfite waste liquor (lignin sulfonate or other technical lignin solutions of wood pulping) or tannin-like compounds such as tannin, where e.g. a mixing ratio of the inventive binders with these additional binders between 1:10 and 10: 1, preferably between 1: 5 and 5: 1, and wherein the binders according to the invention and the additional ones
• the sheets or molded parts produced according to the invention are based on lignocellulose-containing or other organic and / or inorganic raw materials, especially for use in construction.
• the binders or the raw materials can be obtained from the commercially available ones
• Additives e.g. aqueous polyethylene emulsions organic or inorganic protective medium, in pure form or as a solution in an amount of about 0.05 to 30% by weight, preferably 0.5 to 20% by weight, based on the total material.
• Possible solvents are: water or organic solvents, for example residual oils from petroleum processing, chlorinated hydrocarbons, etc. The gluing quality is generally not adversely affected by this. In contrast to
• Phenol / formaldehyde resin-glued boards advantageously neither salt efflorescence nor "bleeding" occur in the materials produced according to the invention.
• the shaped bodies impregnated or bound with them frequently tend to adhere to the surfaces of the hot presses or molds. This can be avoided by means of release agents which are added to the binder.
• Another solution is to apply the release agents in pure form or as a solution to the metallic surfaces that come into contact with the pressings or to the molded surface. All substances previously proposed for this purpose can be used as external release agents.
• Urea formaldehyde resins have up to 50% greater flexural rigidity (besides an improvement in other mechanical properties) or to achieve the same mechanical properties with a binder concentration reduced by about 25 to 70%.
• DABCO ® DA20 Air Products
• DMDEE Dimorpholinodiethylether
• DMPEG Dimorpholinopolyethylenglykol
• PCCAT ® 1KSC Nitroil Europe
• DMDEE and DMPEG can also be processed as stock solutions with a shelf life of more than 2 weeks at a catalyst concentration in pMDI of 20% by weight.
• middle layer chips which consist of a mixture of softwood and

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Medicinal Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Manufacturing & Machinery (AREA)
• Forests & Forestry (AREA)
• Materials Engineering (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7657563

Family Applications (1)

Country Status (9)

Families Citing this family (12)

Family Cites Families (17)

• 2000
  • 2000-09-26 DE DE10047485A patent/DE10047485A1/de not_active Withdrawn
• 2001
  • 2001-09-13 CA CA2423015A patent/CA2423015C/en not_active Expired - Lifetime
  • 2001-09-13 AU AU2002213909A patent/AU2002213909A1/en not_active Abandoned
  • 2001-09-13 WO PCT/EP2001/010563 patent/WO2002026851A1/de active Application Filing
  • 2001-09-13 PL PL36054201A patent/PL360542A1/xx not_active Application Discontinuation
  • 2001-09-13 EP EP01982281A patent/EP1325050A1/de not_active Withdrawn
  • 2001-09-21 US US09/957,845 patent/US6524652B2/en not_active Expired - Lifetime
  • 2001-09-24 AR ARP010104487A patent/AR030799A1/es active IP Right Grant
  • 2001-09-24 MY MYPI20014458A patent/MY137947A/en unknown
• 2003
  • 2003-01-03 US US10/336,146 patent/US6723818B2/en not_active Expired - Lifetime
• 2007
  • 2007-06-15 AR ARP070102643A patent/AR059654A2/es active IP Right Grant

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events