EP2546039A2 - Procédé destiné à la réduction de lýémission dýaldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois - Google Patents

Procédé destiné à la réduction de lýémission dýaldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois Download PDF

Info

Publication number: EP2546039A2
Authority: EP; European Patent Office
Prior art keywords: wood; thiosulfate; additive; urea; aldehydes
Prior art date: 2009-07-06
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

EP12187385A

Other languages

German (de)

English (en)

Other versions

EP2546039A3 (fr

EP2546039B1 (fr

Inventor

Dr. Dirk Grunwald

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.)

Kronotec AG

Original Assignee

Kronotec 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.)

2009-07-06

Filing date

2009-07-06

Publication date

2013-01-16

2009-07-06 Application filed by Kronotec AG filed Critical Kronotec AG

2009-07-06 Priority to EP12187385.5A priority Critical patent/EP2546039B1/fr

2009-07-06 Priority to PL12187385T priority patent/PL2546039T3/pl

2013-01-16 Publication of EP2546039A2 publication Critical patent/EP2546039A2/fr

2013-03-20 Publication of EP2546039A3 publication Critical patent/EP2546039A3/fr

2014-03-26 Application granted granted Critical

2014-03-26 Publication of EP2546039B1 publication Critical patent/EP2546039B1/fr

Status Active legal-status Critical Current

2029-07-06 Anticipated expiration legal-status Critical

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
- B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission

Definitions

the present invention relates to a process for the production of wood-based materials from lignocellulose-containing comminution products, wherein a reduction of the emission of volatile organic compounds and aldehydes including formaldehyde from wood, the crushed products and the wood-based material produced is achieved. More particularly, the present invention relates to methods for reducing the emission of volatile organic compounds and aldehydes, including formaldehyde, wherein wood or the lignocellulosic minerals are treated with thiosulfates, preferably a certain combination of thiosulfate and urea compounds, to control the emission of such volatile organic compounds To prevent aldehydes from the wood or the manufactured wood material. Furthermore, the present invention relates to wood materials that can be produced by this process. In particular, the present invention provides treating agents for treating wood or lignocellulosic crushing products and wood-based materials made therefrom that are capable of reducing the emission of aldehydes, including formaldehyde and volatile organic compounds, and their corresponding use
Lignocellulosic or lignocellulosic materials such as wood and wood pulp products, and derived timber products, such as wood-based panels, include volatile organic compounds (VOCs) and very volatile organic compounds (VVOCs), such as formaldehyde. Volatile organic compounds are subsumed with all volatile organic compounds whose retention time in the gas chromatogram lies between C6 (hexane) and C16 (hexadecane). Among the very volatile organic compounds, among others, formic acid and formaldehyde are counted.
aldehydes as used herein includes not only the volatile compounds but also all other aldehydes, especially formaldehyde, unless otherwise specified.
Volatile organic compounds and very volatile organic compounds occur depending on the nature and condition of the lignocelluloses, such as the type of wood, the storage period, the storage conditions of the wood or the comminution products of lignocellulose, in different chemical compositions and amounts.
the VOCs are derived essentially from extractives of the lignocelluloses, e.g. of wood or conversion products. Prominent representatives of these are substances such as alpha-pinene, beta-pinene, delta-3-carene. Especially in the wood of the conifers, these components are found again. Conversion products, e.g. during storage and processing of the wood and shredded products, e.g. Pentanal and hexanal.
softwoods which mainly produce chipboard, medium-density fiberboard (MDF) or OSB boards, contain large quantities of resin and fats which lead to the formation of volatile organic terpene compounds and aldehydes. Some of these substances are also formed by degradation of the main components of the wood, such as lignin, cellulose and hemicellulose. VOCs including aldehydes and formaldehyde may also be formed by the use of certain adhesives for the manufacture of wood-based materials.
Adhesives currently used in the manufacture of wood-based materials such as OSB boards, medium density fiberboard, etc. include aminoplast adhesives such as urea-formaldehyde (UF) adhesives, melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives).
aminoplast adhesives such as urea-formaldehyde (UF) adhesives, melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives).
Other adhesives typically used in wood-based materials include diisocyanate-based adhesives (PMDI), polyurethane adhesives, phenol-formaldehyde (PF) adhesives, and / or tannin-formaldehyde (TF) adhesives, or mixtures thereof.
PMDI diisocyanate-based adhesives
PF
VOCs and the formaldehyde take place both during the production of the wood-based materials as well as after their production or in their application.
partial chemical degradation of the wood may occur.
volatile compounds such as aldehydes and acids, then emit during the later manufacturing process or later use of the produced wood materials. They can also have a negative influence on the bond strength and thus adversely affect the properties of the produced wood materials.
the WO 02/072323 describes methods for reducing the emission of formaldehyde from layered products containing at least two layers, wherein the surface of a plate or a veneer is treated with a solution containing sulfite or bisulfite.
the examples illustrate that veneer is treated with a sulfite solution to lower formaldehyde emission.
From the WO 2007/012350 are known processes for the production of wood-based articles with low emission of chemical compounds, namely low formaldehyde emission when using formaldehyde-containing resins.
the treatment of wood chips or wood fibers with bisulfite is proposed.
the wood materials produced by methods of the prior art show an unsatisfactory VOC and aldehyde emission, especially during prolonged use.
VOCs especially the aldehydes
formaldehyde emission of wood-based materials it is an object of the present invention using chemical additives to limit the emission of VOCs (especially the aldehydes) and preferably also the formaldehyde emission of wood-based materials to a low level. In doing so, as little as possible should be intervened in the technological process of wood-based material production in order to avoid costly technological adjustments or conversion measures. In addition, a chemical disturbance of the process must also be avoided. When using the usual formaldehyde-containing adhesives whose curing takes place under high temperatures and high pressure. Furthermore, it is an object of the present invention to minimize the emission of aldehydes and VOCs over the entire period, that is to say during the production and the later, longer use of the produced wood-based materials.
the object is achieved by adding a special composition to the wood or the lignocellulose-containing comminution products or the wood-based materials in order, by reaction with the VOCs and the aldehydes, to modify them so that they no longer consist of the wood or the comminution products emit the wood materials produced from the shredded products.
the resulting compounds are so high molecular weight that they are no longer volatile and therefore no longer contribute in the long term to the VOC emissions or aldehyde emissions including formaldehyde emissions.
wood-based materials made of wood or the lignocellulose-containing shredded products are in particular the release of the VOCs and aldehydes when in use. That is, the wood-based materials emit VOCs and aldehydes, including formaldehyde, in wood over a long period of time. These arise in part, as outlined above, over time by chemical reactions in the lignocellulosic wood material. For example, by the action of light, oxygen, etc. corresponding degradation products of wood ingredients, such as fatty acids, but also lignin, cellulose and hemicellulose arise in the produced wood material, which then as the corresponding primary emission or secondary or tertiary emissions, as stated above, from the Emit wood.
VOCs and aldehydes including formaldehyde
the addition of the additive may take place before or after the comminution and work-up of the comminuted products, e.g. B. after the refiner in fibers done.
the additives can be impregnated into the wood, the lignocellulosic crushing products can be treated with the additives z. B. be impregnated.
the application of the additives takes place immediately before the hot pressing or before the dryer.
the addition of the adhesive can be carried out before or after the application of the additive.
the individual components of the additive can be applied simultaneously or separately. In other words, the additive can be applied in solution to the lignocellulose-containing comminution products by conventional means. Alternatively, the lignocellulose-containing comminution products can be treated individually with the components.
the component from the group i) before or after the component from the group ii) are applied separately.
This application or treatment can be carried out before or after application of the adhesive.
the adhesive can also be effected between the application of a first component of the additive and the second component of the additive.
a significant advantage of the present invention is provided in additives that reduce in a reduction step aldehydes but also other volatile organic compounds, especially those with double bonds, so that the emission of these VOCs and aldehydes including formaldehyde are also reduced in the long term and a disorder the technological process does not occur.
thiosulfates in particular the general formula MeS 2 O 3 or Me 2 (S 2 O 3 ) wherein Me is an alkali, alkaline earth metal or ammonium
the emissions, in particular the long-term emission of VOCs and aldehydes including Formaldehyde can be reduced from wood and wood-based materials.
the additive thus preferably contains at least one component in each case from the two groups i) and ii).
Group i) comprises thiosulfates.
they are thiosulfates of the general formula MeS 2 O 3 or Me 2 (S 2 O 3 ), where Me is an alkali metal, alkaline earth metal, or ammonium.
Me is an alkali metal, alkaline earth metal, or ammonium.
Preferred is the thiosulfate of one of the group of sodium thiosulfate, ammonium thiosulfate, lithium thiosulfate, potassium thiosulfate, calcium thiosulfate, magnesium thiosulfate.
the thiosulfate salt used is sodium thiosulfate or ammonium thiosulfate and most preferably ammonium thiosulfate.
the components mentioned antioxidant properties can suppress the VOC emission, which are caused for example by oxidation.
the resulting from the thiosulfate intermediate sulfite may, for. B. with isolated double bonds, such as those contained in, inter alia, terpenes, fats or fatty acids, by reduction or addition with these compounds.
At least one thiosulfate is added to the comminution products.
the salts used are preferably ammonium thiosulfate and / or sodium thiosulfate.
Group ii) comprises urea and urea derivatives, such as monomethylolurea or methyleneurea. Preference is given to using urea.
Urea also reacts with formaldehyde to form mono- and dimethylolurea. This reaction is very slow and thus also allows a long-term lowering of the formaldehyde levels in the wood materials.
urea alone is not meaningful because the reaction with formaldehyde is very slow and it is an equilibrium reaction, so that formaldehyde can be released at a later date again.
a combination of at least one component of group i) and at least one component from group ii) is added to the wood or the comminution products or the wood-based materials in the process according to the invention. Due to the different reaction modes or reaction times of the added components in relation to formaldehyde and VOC, the long-term emission of VOC and formaldehyde can be very effectively changed, thereby optimizing the properties of the wood-based materials. Furthermore, thiosulfate salts of group i) are suitable for stabilizing ureas of group ii) by preventing urea hydrolysis. Thus, a better effectiveness of group ii) can be assumed.
the at least one thiosulfate salt is added in an amount of from 0.1% by weight to 5% by weight, based on atro-lignocellulose. Particular preference is given to amounts of from 0.2% by weight to 1.5% by weight, for. B. a mixture with about 57% solids content with 1% dosed on atro wood.
the amount of urea is preferably in the range of 0.5% by weight to 5% by weight, based on atorocellulose.
the treatment agents according to the invention can be used to reduce emissions from wood, lignocellulose-containing comminution products or wood-based materials, for. B. in the production of wood-based materials are used, wherein the addition is carried out according to the method according to the invention advantageously via standard equipment for binder dosing, such as Beleimtrommel, blow-line gluing or dry gluing.
the addition of the solution to the mat via nozzles directly in front of the hot press is possible.
the additive is not mixed with the adhesive, but before or after application of the adhesive added to the crushed products immediately prior to hot pressing. It is not limited only to formaldehyde-containing adhesives, but also extends to all other thermosetting or thermosetting adhesives used in wood-based materials, such as e.g. PMDI.
the wood can be impregnated directly with the additives according to the invention. This impregnation can take place before the comminution of the wood; An impregnation after production of the wood material is also possible.
compositions containing 0 to 90 wt .-% ammonium thiosulfate 0 to 90% by weight of sodium thiosulfate 0 to 90 wt .-% urea wherein in each case components from groups i) and ii) are present in an amount of at least 0.1% by weight.
the present invention further relates to compositions (treating agents) for treating wood, lignocellulose-containing comminution products and wood-based materials and for reducing the emission of volatile organic compounds (VOC) and aldehydes, including formaldehyde, comprising at least one i) thiosulfate salt, preferably in combination with ii) Urea and urea derivatives.
VOC volatile organic compounds
aldehydes including formaldehyde
VOC volatile organic compounds
aldehydes including formaldehyde
thiosulfate salt preferably in combination with ii) Urea and urea derivatives.
the thiosulfate salt is those derived from sodium and ammonia.
a further preferred embodiment relates to a composition (treating agent) of the abovementioned type in which at least one thiosulfate salt is used in combination with urea and / or urea derivative.
wood materials obtainable according to the method of the invention.
wood-based materials are characterized by a reduced emission of volatile organic compounds, in particular the aldehydes including formaldehyde.
aldehydes including formaldehyde.
These are in particular fibreboard, such as HDF or MDF, chipboard or OSB boards.

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Life Sciences & Earth Sciences (AREA)
Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Wood Science & Technology (AREA)
Forests & Forestry (AREA)
Dry Formation Of Fiberboard And The Like (AREA)
Chemical And Physical Treatments For Wood And The Like (AREA)
Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

EP12187385.5A 2009-07-06 2009-07-06 Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB Active EP2546039B1 (fr)

Priority Applications (2)

Application Number	Priority Date	Filing Date	Title
EP12187385.5A EP2546039B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB
PL12187385T PL2546039T3 (pl)	2009-07-06	2009-07-06	Sposób redukcji emisji aldehydów i lotnych związków organicznych z płyt OSB, stosowanie substancji dodatkowych do realizacji tego celu i płyta OSB

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
EP09008805.5A EP2272644B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois
EP12187385.5A EP2546039B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB

Related Parent Applications (3)

Application Number	Title	Priority Date	Filing Date
EP09008805.5 Division		2009-07-06
EP09008805.5A Division EP2272644B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois
EP09008805.5A Division-Into EP2272644B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

Publications (3)

Publication Number	Publication Date
EP2546039A2 true EP2546039A2 (fr)	2013-01-16
EP2546039A3 EP2546039A3 (fr)	2013-03-20
EP2546039B1 EP2546039B1 (fr)	2014-03-26

Family

ID=41338621

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
EP12187385.5A Active EP2546039B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB
EP09008805.5A Active EP2272644B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
EP09008805.5A Active EP2272644B1 (fr)	2009-07-06	2009-07-06	Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

Country Status (5)

Country	Link
EP (2)	EP2546039B1 (fr)
ES (2)	ES2611080T3 (fr)
HU (1)	HUE031829T2 (fr)
PL (2)	PL2546039T3 (fr)
PT (2)	PT2546039E (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102008020642A1 (de) *	2008-04-24	2009-10-29	Kronotec Ag	Verfahren zur Herstellung von Holzwerkstoffen und Holzwerkstoffe
KR101214074B1 (ko) *	2012-02-27	2012-12-20	백철기	무공해 갈대 합성 목재 및 그의 제조방법
CN102615690B (zh) *	2012-04-12	2014-03-12	文安县天华密度板有限公司	氨气熏蒸木纤维生产环保型人造板的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2002072323A1 (fr)	2001-03-12	2002-09-19	Akzo Nobel N.V.	Procede permettant de reduire les emissions de formaldehyde issues de produits dotes d'une couche chargee de formaldehyde
WO2007012350A1 (fr)	2005-07-27	2007-02-01	Kronospan Technical Company Ltd.	Procede pour produire des articles constitues de materiaux derives du bois a faible emission de composes chimiques
DE102007038041A1 (de)	2007-08-10	2009-02-12	Kronotec Ag	Verfahren zur Vermeidung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP2001164235A (ja) *	1999-09-30	2001-06-19	Kyokutoo International:Kk	ホルムアルデヒド捕捉剤、木質板の処理方法及び木質板
EP1781750A4 (fr) *	2004-07-27	2012-08-08	Duluxgroup Australia Pty Ltd	Système pour fournir un substrat cellulosique reconstitué enduit de poudre

2009
- 2009-07-06 ES ES09008805.5T patent/ES2611080T3/es active Active
- 2009-07-06 HU HUE09008805A patent/HUE031829T2/en unknown
- 2009-07-06 PL PL12187385T patent/PL2546039T3/pl unknown
- 2009-07-06 PT PT121873855T patent/PT2546039E/pt unknown
- 2009-07-06 EP EP12187385.5A patent/EP2546039B1/fr active Active
- 2009-07-06 ES ES12187385.5T patent/ES2468024T3/es active Active
- 2009-07-06 EP EP09008805.5A patent/EP2272644B1/fr active Active
- 2009-07-06 PT PT90088055T patent/PT2272644T/pt unknown
- 2009-07-06 PL PL09008805T patent/PL2272644T3/pl unknown

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2002072323A1 (fr)	2001-03-12	2002-09-19	Akzo Nobel N.V.	Procede permettant de reduire les emissions de formaldehyde issues de produits dotes d'une couche chargee de formaldehyde
WO2007012350A1 (fr)	2005-07-27	2007-02-01	Kronospan Technical Company Ltd.	Procede pour produire des articles constitues de materiaux derives du bois a faible emission de composes chimiques
DE102007038041A1 (de)	2007-08-10	2009-02-12	Kronotec Ag	Verfahren zur Vermeidung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen
WO2009021702A1 (fr)	2007-08-10	2009-02-19	Kronotec Ag	Procédé de réduction des émissions d'aldéhydes et de composés organiques volatils à partir de matériaux dérivés du bois

Also Published As

Publication number	Publication date
ES2611080T3 (es)	2017-05-04
PT2272644T (pt)	2017-01-10
EP2546039A3 (fr)	2013-03-20
ES2468024T3 (es)	2014-06-13
EP2272644A1 (fr)	2011-01-12
EP2546039B1 (fr)	2014-03-26
EP2272644B1 (fr)	2016-10-19
PL2546039T3 (pl)	2014-08-29
PT2546039E (pt)	2014-06-09
PL2272644T3 (pl)	2017-09-29
HUE031829T2 (en)	2017-08-28

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