AU670702B2 - A method of producing a wood-derived material - Google Patents

A method of producing a wood-derived material Download PDF

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Publication number
AU670702B2
AU670702B2 AU70366/94A AU7036694A AU670702B2 AU 670702 B2 AU670702 B2 AU 670702B2 AU 70366/94 A AU70366/94 A AU 70366/94A AU 7036694 A AU7036694 A AU 7036694A AU 670702 B2 AU670702 B2 AU 670702B2
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AU
Australia
Prior art keywords
bonding agent
accordance
weight
wood
cellulose
Prior art date
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Ceased
Application number
AU70366/94A
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AU7036694A (en
Inventor
Berthold Dombo
Antonio Pizzi
Willi Roll
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.)
Hexion Specialty Chemicals AG
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Ruetgerswerke AG
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Application filed by Ruetgerswerke AG filed Critical Ruetgerswerke AG
Publication of AU7036694A publication Critical patent/AU7036694A/en
Assigned to RUTGERS AKTIENGESELLSCHAFT reassignment RUTGERS AKTIENGESELLSCHAFT Amend patent request/document other than specification (104) Assignors: RUTGERSWERKE AKTIENGESELLSCHAFT
Application granted granted Critical
Publication of AU670702B2 publication Critical patent/AU670702B2/en
Assigned to BAKELITE AG reassignment BAKELITE AG Alteration of Name(s) in Register under S187 Assignors: RUTGERS AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H99/00—Subject matter not provided for in other groups of this subclass, e.g. flours, kernels
    • 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
    • C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
    • 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
    • C08G16/00—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00
    • C08G16/02—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes
    • 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
    • C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
    • C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
    • C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
    • C08G8/20—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with polyhydric phenols
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/04—Condensation polymers of aldehydes or ketones with phenols only

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Wood Science & Technology (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Operated Clutches (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
  • Inorganic Insulating Materials (AREA)
  • Soft Magnetic Materials (AREA)
  • Laminated Bodies (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Compounds Of Unknown Constitution (AREA)

Abstract

Thermocurable binders for cellulose-containing products contain tannin and a substance which liberates formaldehyde at elevated temperature. Materials produced using these binders exhibit good strength properties and low swelling values after immersion in water.

Description

P1001011 2ao9l Flogulation 3 2(2)
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Application Number: 70366/94 Lodged: 19 August 1994 Invention Title: A METHOD OF PRODUCING A WOOD-DERIVED MATERIAL C e C ee *o The following statement Is a full description of this invention, Including the best method of performing it known to e ee \^jj^ A method of producina a wood-derived material This invention relates to a method for the production of wood-derived material, particularly particle boards in which tannins are used as the bonding agent.
In the context of the search for natural and especially renewable raw materials for the production of bonding agents for wood-derived materials, the use of tannins is known in the art Macromol. SCI.-Chem. A 16 1243-1250 (1981).
In spite of their good availability, however, the use of tannins has not become generally established, because the tensile strength of tannin-bonded wood-derived materials, particularly after they have been stored in water, is not satisfactory.
It is therefore the aim of the invention to provide a tannins-based bonding agent which can be used to produce wood-derived materials with considerably improved mechanical properties.
This aim is achieved by: a method of producing a wood-derived material according to claims 1 to 6.
It was found that tannins of the pecan nut and pine bark exhibit outstanding adhesiveness (compared with other tannins) when used, in conjunction with hexamethylenetetramine (Hexa) as a bonding agent for wood chips. The tensile strength of such products in increased, reaching values such as those of e.g. corresponding materials bonded with phenolic resin. The drop in transverse tensile strength after storage in water is considerably reduced, and
V.
S the swelling values in boiling water are also reduced.
A further advantage here is that these tannins can be used without a breakdown treatment such as is commonly used with other tannins.
"A Suitable tannins are those from the pine bark or pecan nut group.
S Mixtures of these tannins with e.g. mimosa or quebracho tannin in a ratio of from to 5:2 have a longer hardening time, but can nevertheless be used. These tannins are commercially available products and have long been in use, mainly as tanning agents. The commercial grade of these products is adequate for use according to the invention.
7 The tannins of the present invention are mixed with hexamethylenetetramine, the hexamethylenetetramine content of the bonding agent being 3.0 to 9% by weight relative to the tannin content.
It is also within the scope of the invention if the bonding agent contains not only the special types of tannin and hexamethylenetetramine but also, in addition, up to 50 by weight of a novolak or up to 20% by weight of an at-least difunctional isocyanate compound, e.g. diisocyanatonaphthaline, 4, 4"triisocyanatotriphenylmethane, or isophorone-, toluene-, or hexamethylenediisocyanate or diisocyanato-diphenylmethane (MDI); in which case, in practical use, the di- or poly- isocyanate is applied to the cellulose-containing products at the same time as the application of the dried mixture of tannin according to the invention and hexamethylenetetramine before said cellulosecontaining products are pressed to form the resultant materials.
Suitable cellulose-containing products are e.g. wood chips, or cellulosebased fibres such as cotton, flax, or straw Se e e **o
I
from which particle boards, non-woven fabrics7 or sound and heat insulation boards are to be produced.
The production of materials is performed as follows: the bonding agents used according to the invention are mixed with celiulosecontaining products, the mixture is placed in a mould, and is hardened under pressure at a temperature above the decomposition temperature of the formaldehyde-releasing material and below the decomposition temperature of the tannin, 'i.e preferably 150 to 210"C. The pressure used is in the range from 0.1 to 4 MPa/mm 2 depending on the material used and the desired density. Thus the production of e.g.
three-layer particle boards is also possible, using a pressure of 2 to 3.5 MPa/mm 2 Depending on the desired material and the desired strength, the amount of bonding agent used ranges from 4 to 20% by weight relative to the amount of cellulose-containing product. The bonding agent can be in the form of a mixture of solids, or a solution of the components in water, alcohol or a water-alcohol mixture.
Such solutions can be stored at room temperature for a number of weeks without a large increase in viscosity. In the case of aqueous solutions, however, the simple addition Sof a fungicide is recommended to prevent any fungal attack.
S: The following examples show the use of the method according to the invention for the production of particle boards.
Examples Wood chips are sprayed with a water-alcohol solution I containing the bonding agent. The amount of bonding agent in the solution by weight is 11% of the weight of the wood. Th( wood chips are dried and then moulded, pressed, and hardened Sin a manner known in the art (2.5 N/mm 2 195 0 C) to form boards of 400 x 350 x 12 mm.
4 The following are determined: the density and transverse tensile strength of the boards in the dry state and (b) the wet state after being kept in water (2 hours in boiling water, followed by drying for 16 hours at 105°C) and also the thickness swell after 2 hours in boiling water, for different variations of the mixing ratios of the bondingagent components, the amount of bonding agent, and the duration of pressing.
Examples 1 to In Example 1, the proportion of hexamethylenetetramine ranges from 7.5 to 5.5% of the bonding agent.
Correspondingly, the proportion of pecan nut tannin ranges from 92.5% to 94.5%.
In Example 2, the proportion of hexamethylenetetramine relative to tannin is i.e. the proportion of pecan nut tannin is 93.6%. The duration of pressing is varied.
Example 3 shows the values for a three-layer particle board with 6.4% hexamethylenetetramine in the bonding agent, and a bonding-agent content of 10% in the inner layer and 12% in the outer layers.
Examples 4 and 5 show the data for the use of mimosa (wattle) tannin, as a comparison for Examples 1 and 2.
The following tables show the values obtained: e* Example 1 Hex ame t hyl en e tr amine Example 4 (comparison) Pressing time (sec/mm) Density (kg/rn 2 Transverse tensile strength, dry (M.Pa) Transverse tensile strength, after period in water a) Swelling(% HCHO Emission (mg/100g; WKI) 17.5 729 0.*82 0.25 25.0 1.71 6.4% 17.5 730 0.*81 0.27 23.9 1.45 5.*5% 17.5 736 0.79 0.*26 22.1 0,84 7.5% 17.5 731 0.45 0.09 32.1 2.01 17.5 711 0.43 0.07 31.5 1.87 Example 2 Hexa) Ex ample (comparison) Hexa) Pressing time (sec/mm) Density (kg/n 3 17.5 12.5 30.0 17.5 12.5 730 *13 8 714 711 Transverse tensile strength, dry (M.Pa) Transverse tensile strength, after period in water '(H.Pa) Swelling(% HCHO Emission (mg/b00g; WXI) 0.81 0.27 23.9 1.45 0.75 0.19 22.4 1.32 0. 67 0.17 20.9 1. 1 0.5 0.13 29.7 1 64 0.45 0.09 32.1 2.01 0.41 0.03 36.7 1.28 Examole 3 Pressing time (sec/mm) 12.5 Binding agent Middle/Outer Layer 10/12 Moisture of chips after bonding Middle/Outer Layer 28/26 Density (kg/m 3 723 Transverse tensile strength, dry (MPa) 0.83 Transverse tensile strength after period in water (MPa) 0.27 Swelling 22.1 *HCHO emission (mg/100g, WKI) 1.4 *e *o h 8 Example 6 Single-layer particle boards were produced and tested according to the general conditions for the examples (pressing time 15 s/mm at 190"C, 2.5 N/mm 2 Bonding agent: Tannin from pine bark (37% aqueous solution) Hexamethylenetetramine aqueous solution) Zinc acetate aqueous solution) Water 337 parts by weight 19.3 parts by weight 19.3 parts by weight 10 parts by weight Results: Density (kg/m 3 708 0
S
Transverse tensile strength, dry (MPa) 0.80 Transverse tensile strength, after period in water (MPa) 0.23 HCHO emission (mg/100 0.1 Examole 7 Triple-layer particle boards were produced and tested according to the general conditions for the examples (pressing time 15 s/mm at 190 0 C, 2.5 N/mm 2
S
0 9.
Kt I Bonding agent: Core layer Outer layers Tannin from pine bark (37% aqueous solution) Hexa-rethylenetetramine aqueous solution) Zinc acetate aqueous solution) Water 327 19.5 24 .0 12 327 parts by weight 19.5 partus by weight 19.5 parts by weight >v weight Results: Density (kg/rn 3 Transverse tensile strength, dry Transverse tensile strength, after period in water (MLPa) HCHO emission (mg/100 723 0.80 0.29 0.16 0 0 V. 6 0 o 00**O* 00 0 000 0 00 0 0* 00
I

Claims (7)

1. A method of producing a wood-derived material, by mixing a bonding agent with products containing cellulose, putting the mixture into a mould, and processing it at a temperature in the range of 150 to 210 'C and at a pressure in the range of 0.1 to 4 MPalmm 2 characterised in that the bonding agent contains tannin of the pecan nut and/or pine bark, together with hexamethylenetetramine.
2. A method in accordance with claim 1, characterised in that the hexamethylenetetramine component is 3.0 to 9% by weight relative to the tannin content.
3. A method in accordance with claim I or claim 2, characterised in that the bonding agent contains a novolak, the amount thereof being up to 50% by weight.
4. A method in accordance with claim 1 or claim 2, characterised in that the bonding agent contains up to 20% by weight of an isocyanate compound that is a' least difunctional.
5. A method in accordance with claim I, characterised in that the bonding agent is mixed with the cellulose-containing products in the form of a powder.
6. A method in accordance with claim 1, characterised in that the bonding agent is sprayed onto the cellulose-containing products in the form of.a solution.
7. A method according to claim I substantially as herein described or exemplified. DATED this 23rd day of January, 1996 RUTGERS AKTIENGESELLCHAFT WATERMARK PATENTf TRADEMARK ATTORNEYS 290 BURWOOD FOAD HAWTHORN VIC 3122 AUSTRALIA LCG:JGC:BB
AU70366/94A 1993-08-21 1994-08-19 A method of producing a wood-derived material Ceased AU670702B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4328220 1993-08-21
DE4328220 1993-08-21
DE4402159A DE4402159A1 (en) 1993-08-21 1994-01-26 Thermosetting binders
DE4402159 1994-01-26

Publications (2)

Publication Number Publication Date
AU7036694A AU7036694A (en) 1995-03-02
AU670702B2 true AU670702B2 (en) 1996-07-25

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ID=25928829

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Application Number Title Priority Date Filing Date
AU70366/94A Ceased AU670702B2 (en) 1993-08-21 1994-08-19 A method of producing a wood-derived material

Country Status (15)

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EP (1) EP0639608B1 (en)
AT (1) ATE170892T1 (en)
AU (1) AU670702B2 (en)
BR (1) BR9403283A (en)
CA (1) CA2129936C (en)
CZ (1) CZ9402006A3 (en)
DE (2) DE4402159A1 (en)
ES (1) ES2068171T3 (en)
FI (1) FI943836A (en)
GR (1) GR950300015T1 (en)
HU (1) HUT71636A (en)
NO (1) NO943068L (en)
NZ (1) NZ264187A (en)
SI (1) SI9400325A (en)
SK (1) SK99094A3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4447711C2 (en) * 1994-01-27 2000-08-03 Bakelite Ag Heat-curable binders for cellulose-based prods., e.g. chipboard
DE4402341C2 (en) * 1994-01-27 2000-11-02 Bakelite Ag Binder solutions for cellulosic products
EP0788866B1 (en) * 1996-02-09 1998-05-20 Schlingmann GmbH & Co. Method for the fabrication of particle boards and fibreboards with low formaldehyde content using tannin based binders
US5912317A (en) * 1997-04-02 1999-06-15 Angus Chemical Company Oxazolidine-based hardeners for the room temperature cure of resorcinol resins in the bonding of wood articles--II
US5858553A (en) * 1997-04-02 1999-01-12 Angus Chemical Company Oxazolidine-based hardeners for the room temperature cure of resorcinol resins in the bonding of wood articles
DE19733925A1 (en) * 1997-08-06 1999-02-11 Bakelite Ag Binder composition, its use and a process for the production of particle board
FR2952937B1 (en) 2009-11-20 2013-02-08 Chaire Europeenne De Chimie Now Pour Un Developpement Durable NOVEL PHENOPLAST RESINS OBTAINED FROM PHENOLIC COMPOUNDS AND MACROMOLECULAR HARDENERS WITH ALDEHYDE FUNCTIONS

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1225571A (en) * 1968-02-27 1971-03-17
US4098765A (en) * 1977-05-02 1978-07-04 Kays Stanley J Pecan nut by-products and processes
US4201699A (en) * 1977-07-12 1980-05-06 Chen Chia Ming Phenol-aldehyde resin composition containing pecan pith extract and an aldehyde
EP0544927B1 (en) * 1990-12-14 1995-10-11 Diteco Ltda. An adhesive composition comprising isocyanate, phenol-formaldehyde and tannin, useful for manufacturing plywoods for exterior application
DE9209289U1 (en) * 1992-07-10 1992-08-20 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eV, 8000 München Moisture-resistant, biologically resistant chipboard

Also Published As

Publication number Publication date
CZ9402006A3 (en) 1995-03-15
FI943836A0 (en) 1994-08-19
CA2129936C (en) 2000-08-15
SK99094A3 (en) 1995-04-12
CA2129936A1 (en) 1995-02-22
EP0639608B1 (en) 1998-09-09
AU7036694A (en) 1995-03-02
DE59406873D1 (en) 1998-10-15
ATE170892T1 (en) 1998-09-15
ES2068171T1 (en) 1995-04-16
FI943836A (en) 1995-02-22
BR9403283A (en) 1995-04-11
DE4402159A1 (en) 1995-02-23
HU9402410D0 (en) 1994-11-28
NO943068D0 (en) 1994-08-19
ES2068171T3 (en) 1998-11-16
NO943068L (en) 1995-02-22
SI9400325A (en) 1995-02-28
MX9405910A (en) 1997-10-31
NZ264187A (en) 1995-05-26
EP0639608A1 (en) 1995-02-22
GR950300015T1 (en) 1995-04-30
HUT71636A (en) 1996-01-29

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