EP1011939A1 - Fabrication de panneaux composites - Google Patents

Fabrication de panneaux composites

Info

Publication number
EP1011939A1
EP1011939A1 EP98930962A EP98930962A EP1011939A1 EP 1011939 A1 EP1011939 A1 EP 1011939A1 EP 98930962 A EP98930962 A EP 98930962A EP 98930962 A EP98930962 A EP 98930962A EP 1011939 A1 EP1011939 A1 EP 1011939A1
Authority
EP
European Patent Office
Prior art keywords
treatment
agent
straw
surfactant
alkali
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.)
Granted
Application number
EP98930962A
Other languages
German (de)
English (en)
Other versions
EP1011939B1 (fr
Inventor
Panagiotis Nakos
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.)
Marlit Ltd
Original Assignee
Marlit Ltd
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
Priority claimed from GBGB9714679.9A external-priority patent/GB9714679D0/en
Priority claimed from GBGB9714893.6A external-priority patent/GB9714893D0/en
Application filed by Marlit Ltd filed Critical Marlit Ltd
Publication of EP1011939A1 publication Critical patent/EP1011939A1/fr
Application granted granted Critical
Publication of EP1011939B1 publication Critical patent/EP1011939B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0209—Methods, e.g. characterised by the composition of the agent
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K9/00—Chemical or physical treatment of reed, straw, or similar material
    • 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
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/10—Extraction of components naturally occurring in wood, cork, straw, cane or reed

Definitions

  • the present invention relates to a method of manufacturing composite boards including improving the bondability of annual plant fibrous material such as straw.
  • Defibration means disruption of the morphological structure of annual plant fibres, straw leading to the creation of individual fibres.
  • the waxy and the silica layer encircling the straw inhibit sufficient direct contact between the binder and the straw fibres.
  • thermal treatment combined with high shear forces disrupts the original morphological structure of straw leading to higher accessibility of individual fibres to the binder and consequently, an increase in the affinity of straw towards bonding.
  • the process of opening up the morphological structure of straw is similar to that of pulping wood for paper making.
  • the properties of the boards made from straw could be further improved if the straw was treated or pre-treated with a dilute solution of sodium hydroxide containing 0.01 - 2% NaOH based on the straw material.
  • alkaline materials other than sodium hydroxide could be also used to achieve the same effect. It was disclosed that such chemicals could be formaldehyde catchers such as urea and other catchers well known in the art.
  • the present invention provides a process for the manufacture of composite boards in which annual plant and/or agri-waste material is treated to improve bondability to synthetic or natural binders by subjecting the material to treatment with an aqueous medium containing an agent capable of removing waxy or silica layers from the material, which agent is a strong acid, a strong alkali or a surfactant or a combination of acid or alkali and surfactant and the treatment is continued until the waxy or silica layers are sufficiently removed so as not to interfere with the bond to the binder.
  • the preferred agent is a combination of strong acid or alkali and surfactant.
  • the process of the invention can be applied either to undefibrated plant material that is plant material in which the stalks are merely chopped or to defibrated plant material in which the original material has been broken down to individual fibres .
  • Modification of the process of the present invention is the addition of such an agent to a material while it is being subjected to high shear treatment providing such agent is a combination of a surfactant with an acid or alkali to reduce the energy consumption or improve properties of the boards.
  • a process for the treatment of annual plant material to improve bondability to synthetic or natural binders comprising subjecting the material to treatment with a surfactant in a liquid acidic or alkaline dispersion or solution before or during at least part of an attrition treatment of the material to reduce the energy consumption or improve properties of the boards.
  • a process in which the plant material is treated with an aqueous system containing acid or non-alkaline surfactant is treated with an aqueous system containing acid or non-alkaline surfactant.
  • the treatment can precede or be simultaneous with a high shear treatment of the material to effect defibration to reduce the energy consumption or improve properties of the boards.
  • a combination of strong alkali e.g. NaOH
  • a surfactant to treat the plant material.
  • a strong acid in high strength for example 36% by weight solution in water of hydrochloric acid
  • high strength is meant a solution in water of the highest strength possible with risk of damage to the straw (for example at too great a concentration sulphuric and nitric acids for example could damage the basic straw structure) .
  • a surfactant which is sufficiently strong to remove waxy layers in straw material.
  • the effectiveness of the de-waxing or de- silification agent can be verified by achieving a water absorption (% weight gain on soaking in water) of at least 200% or by forming a board and verifying that the board has a certain IB (Internal Bond) strength.
  • the IB strength is the tensile strength perpendicular to the plane of the board, e.g. according to EN312-2 for 19mm- thick particleboard at least an IB strength of 0.24N/mm 2 is considered to be necessary.
  • Acids which can be employed include strong inorganic acids such as sulphuric acid or hydrochloric acid and strong organic acids such as formic, acetic or sulfonic acid.
  • Surfactants which can be employed in the invention are those surface active agents which are sufficiently powerful to effect the removal of wax or silica layers from the surface of straw. In particular some surfactants are not easily dispersible or soluble in water or other solvents and should be added to water or solvent along with an alkaline or acidic agent to enable adequate dispersion or solution.
  • a typical surfactant is o,p-dodecyl sulfonic acid but this is only exemplary of the well known agents. This surfactant when used with sodium hydroxide, as alkali was very effective.
  • surfactants are alkyl benzene sulphonic acid for example with sodium hydroxide; cetyl trimethyl ammonium chloride for example with hydrochloric acid.
  • This surfactant can be employed by itself for example a fatty alcohol surfactant can be selected from cationic, anionic or neutral surfactants which one skilled in the art would appreciate, given the teaching of the invention would be likely to affect the waxy/silicious agents.
  • Alkalis which can be employed include sodium hydroxide or other strong inorganic alkalis, ammonia or organic strongly alkaline materials.
  • the active agents can be contacted with the straw in either a pre-treatment step or as a part of a defibration treatment step. If the fibrous material is to be brought into contact with active agent as a pre-treatment step then it is convenient to use a tank.
  • a tank can be filled with the appropriate chemical and then the residence time of the fibrous material in the tank can be adjusted accordingly depending on the actual chemical used, the concentration of the chemical and the temperature of the acidic or alkaline solution or the temperature of the aqueous wetting agent solution. It will be recalled that the purpose of the treatment is to dissolve or otherwise remove the waxy layer and/or the silica layer from the surface of the plant fibres.
  • An important aspect of the invention is that in case of acid curing binders the plant material after treatment is adjusted (if necessary) to a pH of 3-8. This can be achieved by addition of either alkali or acid as appropriate or by extensive washing.
  • the plant material particularly straw is chopped or cut to a length of less than 10cm preferably between 0.5cm and 5cm. It is also possible to split the straw stalks in the middle (lengthwise) to make the interior of the fibre accessible to subsequent treatment.
  • Material that is used in the process of the invention is annual plant material and/or agri-waste such as rice, straw, rice husks, wheat straw, rice straw, barley straw, corn residues, miscanthus, sorghum, sunflower etc. However, most preferably, straws are utilized in the processes of the invention.
  • High shear devices which can be used when required include high shear attrition systems discussed in the earlier application UK 9607566.8. However, it is also possible to use attrition mills which employ less energy than high shear systems. Such attrition mills are well known in the art.
  • the fibres pre-treated by acid or alkali and/or wetting agent can be subjected to processing through the attrition mill or alternatively the acid/alkali/wetting agent treatment chemicals can be contacted with the fibres as they enter the attrition mill .
  • the fibres can be dried using conventional dryers used in particleboard factories, e.g. drum dryer, or a tube dryer like that used in medium density fibreboard mills. From then onwards, the dried fibres follow the conventional procedure as for the production of particleboard, medium or high density fibreboard.
  • conventional dryers used in particleboard factories e.g. drum dryer, or a tube dryer like that used in medium density fibreboard mills. From then onwards, the dried fibres follow the conventional procedure as for the production of particleboard, medium or high density fibreboard.
  • Materials particularly straw treated in accordance with this invention have improved bondability to synthetic and natural bonding agents and isocyanate binders.
  • Binders which can be used to bond treated straw are formaldehyde-based resins such as urea-formaldehyde resins (UF-resins) , melamine-urea-formaldehyde resins (MUF-resins) , melamine-formaldehyde resins (MF-resins) , phenol-formaldehyde resins (PF-resins) , melamine-urea- phenol-formaldehyde resins (MUPF-resins) , tannin- formaldehyde resins (TF-resins) and isocyanate binders.
  • the binders can be added in the amount of 5 - 25% based on dry straw material.
  • the invention is particularly applicable to amino resins.
  • the straw can be mixed with the binder when the straw is in the high shear machine when that is employed or in a separate blender.
  • Addition of a sizing agent is not obligatory but can be added if necessary either in the defibration treatment or separately.
  • a method of assessing the effectiveness of a treating agent is to measure the water absorption of the treated material.
  • Samples of treated straw are dried at 65°C for 48hours. This will usually achieve a moisture content of 5% (dry basis) .
  • Treatments 1, 2 and 3 were for comparison with the teaching of GB 709569A and GB 2084212A
  • the straw After the straw has been dried to a moisture content of approximately 4% it was placed in a Loedige blender and a urea formaldehyde resin was applied with a spraying system. The resin was catalyzed with an ammonium salt to accelerate the curing. The glued material was then formed to boards and the boards were pressed in a hot press. The initial temperature of the press was 200°C.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Laminated Bodies (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un procédé de traitement pour matériau de plante annuelle (par exemple, paille) visant à améliorer la capacité de liaison dudit matériau avec des résines liantes pour la formation de composites, qui consiste à soumettre le matériau à l'action d'un milieu liquide contenant une quantité suffisante d'acide, d'alcali ou de tensio-actif suffisamment fort pour éliminer les couches sensiblement cireuses ou à base de silice.
EP98930962A 1997-07-11 1998-07-10 Fabrication de panneaux composites Expired - Lifetime EP1011939B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9714679.9A GB9714679D0 (en) 1997-07-11 1997-07-11 Manufacture of straw boards
GB9714679 1997-07-11
GBGB9714893.6A GB9714893D0 (en) 1997-07-15 1997-07-15 Manufacture of straw boards
GB9714893 1997-07-15
PCT/GR1998/000021 WO1999002318A1 (fr) 1997-07-11 1998-07-10 Fabrication de panneaux composites

Publications (2)

Publication Number Publication Date
EP1011939A1 true EP1011939A1 (fr) 2000-06-28
EP1011939B1 EP1011939B1 (fr) 2001-09-05

Family

ID=26311872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98930962A Expired - Lifetime EP1011939B1 (fr) 1997-07-11 1998-07-10 Fabrication de panneaux composites

Country Status (12)

Country Link
EP (1) EP1011939B1 (fr)
JP (1) JP2001512058A (fr)
KR (1) KR20010021695A (fr)
CN (1) CN1263490A (fr)
AU (1) AU8123398A (fr)
BG (1) BG104004A (fr)
BR (1) BR9810704A (fr)
CA (1) CA2292661A1 (fr)
DE (1) DE69801585D1 (fr)
IL (1) IL133338A0 (fr)
PL (1) PL337927A1 (fr)
WO (1) WO1999002318A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102431071A (zh) * 2011-10-25 2012-05-02 张文生 一种秸秆纤维板的制造方法及塑料衬板液体球磨机

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2250645A1 (fr) 1998-10-16 2000-04-16 Wayne Wasylciw Procede de production d'articles a partir de particules lignocellulosiques et d'un liant
CN1338983A (zh) * 1999-11-01 2002-03-06 艾伯塔研究委员会公司 非木质木素纤维素材料的酸处理
KR20010089911A (ko) * 2000-03-13 2001-10-17 류영선 무공해 건축자재용 소재 및 그 제조방법
WO2002081160A1 (fr) * 2001-04-03 2002-10-17 Alberta Research Council Inc. Procedes de traitement de la paille pour l'obtention de fibres
KR100700634B1 (ko) * 2002-05-03 2007-03-27 재단법인서울대학교산학협력재단 농산 폐자원-목재 파티클 복합재
KR100517591B1 (ko) * 2002-06-01 2005-09-28 유중형 옥수숫대 합판 및 그 제조방법
KR20020075340A (ko) * 2002-08-27 2002-10-04 김수현 농업부산물(밀집,볏집,옥수수대)활용 특수가공 신소재개발 제조기술.
CN100369726C (zh) * 2005-04-04 2008-02-20 上海康拜环保科技有限公司 水稻秸杆脱硅处理方法
KR100710618B1 (ko) * 2005-08-11 2007-04-24 전북대학교산학협력단 왕겨를 이용한 복합재료 및 그 제조방법
WO2007069807A1 (fr) * 2005-12-13 2007-06-21 Hong, Hook Panneau de tiges de maïs fonctionnel et procédé de préparation correspondant
KR100779632B1 (ko) 2005-12-13 2007-11-28 유해일 옥수숫대를 이용한 기능성 판재 및 그 제조방법
KR101034603B1 (ko) * 2010-07-26 2011-05-12 김재철 농산 폐기물 파티클의 제조 방법 및 이를 이용한 파티클 보드의 제조 방법
EP2766156A4 (fr) 2011-10-13 2015-11-11 Univ Connecticut Procédé pour la fabrication de panneaux de particules
CN102431072A (zh) * 2011-10-25 2012-05-02 张文生 一种秸秆的处理方法及秸秆纤维板的制造方法
CN104029268A (zh) * 2014-06-17 2014-09-10 镇江市高等专科学校 一种农作物豆秸秆纤维复合材料的制备方法
CN108705646A (zh) * 2018-05-02 2018-10-26 信阳美丽真好秸秆新材科技有限公司 稻麦秸阻燃人造板及其制备方法
CN113442254B (zh) * 2021-01-18 2022-07-12 湖南城市学院 一种芦苇刨花板的生产方法
CN113500672B (zh) * 2021-06-15 2022-03-15 长江大学 一种破乳剂、稻草秆的处理方法和应用

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GB709569A (en) * 1951-04-12 1954-05-26 Louis Grand Method of obtaining pulps usable in the paper-making or other industries, from wood or annual plants, and the pulps resulting therefrom
HU181185B (en) * 1980-09-15 1983-06-28 23 Sz Allami Epitoeipari Valla Method for producing bodies particularly auilding units
SE466060C (sv) * 1990-02-13 1995-09-11 Moelnlycke Ab Absorberande kemitermomekanisk massa och framställning därav
DE4211888A1 (de) * 1992-04-09 1993-10-14 Wulf V Dr Bonin Ganzpflanzen-Formteile
SE470330B (sv) * 1992-06-11 1994-01-24 Sunds Defibrator Ind Ab Förfarande för framställning av fiberboard enligt torra metoden

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9902318A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102431071A (zh) * 2011-10-25 2012-05-02 张文生 一种秸秆纤维板的制造方法及塑料衬板液体球磨机

Also Published As

Publication number Publication date
AU8123398A (en) 1999-02-08
IL133338A0 (en) 2001-04-30
JP2001512058A (ja) 2001-08-21
BG104004A (en) 2000-07-31
WO1999002318A1 (fr) 1999-01-21
DE69801585D1 (de) 2001-10-11
EP1011939B1 (fr) 2001-09-05
BR9810704A (pt) 2000-08-08
KR20010021695A (ko) 2001-03-15
CN1263490A (zh) 2000-08-16
PL337927A1 (en) 2000-09-11
CA2292661A1 (fr) 1999-01-21

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