HRP970066A2 - Two-component glue system for the production of laminated wood panels - Google Patents

Two-component glue system for the production of laminated wood panels Download PDF

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Publication number
HRP970066A2
HRP970066A2 HR19603988.6A HRP970066A HRP970066A2 HR P970066 A2 HRP970066 A2 HR P970066A2 HR P970066 A HRP970066 A HR P970066A HR P970066 A2 HRP970066 A2 HR P970066A2
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Croatia
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component
wooden
lamellas
wooden lamellas
production
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HR19603988.6A
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Croatian (hr)
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Dieter Dormeyer
Joachim Ebert
Manfred Ebner
Eberhard Pfuetze
Tilman Reiner
Hermann Schatz
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Basf Ag
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
    • C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C09J161/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C09J161/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

A two-component glue system suitable for the production of laminated wood panels consists of (a) an aqueous hardener mixture (component (a)) which contains (a1) 3 to 15 wt % of a Brönsted acid; (a2) 20 to 40 wt % of a mineral filler; (a3) 2 to 8 wt % of a thickener; (a4) 40 to 60 wt % water; and (b) a melamine resin (component (b)).

Description

Predloženi izum odnosi se na dvokomponentno ljepilo prikladno za proizvodnju šperploča, koje se sastoji od The proposed invention relates to a two-component adhesive suitable for the production of plywood, which consists of

a) vodene mješavine otvrdivača (komponenta (a)), koja sadrži a) aqueous mixture of hardener (component (a)), which contains

a1) 3 do 15 mas. % Bronstedt kiseline, a1) 3 to 15 wt. % Bronstedt acid,

a2) 20 do 40 mas. % mineralnog punila, a2) 20 to 40 wt. % mineral filler,

a2) 2 do 8 mas. % sredstva za zgušnjavanje, a2) 2 to 8 wt. % thickening agent,

a3) 40 do 60 mas. % vode a3) 40 to 60 wt. % water

i and

b) melaminske smole (komponenta (b)). b) melamine resins (component (b)).

Izum se nadalje odnosi na postupak za proizvodnju šperploče upotrebom dvokompenentnog ljepila kao i na šperploču proizvedenu na taj način. The invention further relates to the process for the production of plywood using a two-component adhesive, as well as to the plywood produced in this way.

Šperploča izgrađena od slijepljenih drvenih lamela općenito je poznata (usporedi Informationsdienst Holz, Holzleimbau, Bauen mit Brettschichtholz; Izdavač Arbeitsgemeinschaft Holz e. V. und Centrale Marketingsgesellschaft, ISSN-Nr. 0446-2114). Te šperploče upotrebljavaju se pretežno kao noseći elementi u industrijskoj, stambenoj i javnoj gradnji. Plywood constructed from glued wooden lamellas is generally known (compare Informationsdienst Holz, Holzleimbau, Bauen mit Brettschichtholz; Publisher Arbeitsgemeinschaft Holz e. V. und Centrale Marketingsgesellschaft, ISSN-Nr. 0446-2114). These plywood boards are mainly used as load-bearing elements in industrial, residential and public construction.

Na tom području tehničke primjene postavljaju se visoki zahtjevi prema mehaničkoj čvrstoći građevnih dijelova. Čvrstoća spoja mora biti dovoljno visoka također i nakon mnogo godina unatoč djelovanju vremenskih prilika kao što su izmjene temperature i vlage. In this area of technical application, high demands are placed on the mechanical strength of construction parts. The strength of the joint must be sufficiently high even after many years despite the effects of weather conditions such as changes in temperature and humidity.

Zbog toga, da bi dobila potrebnu preporuku prikladnosti građevinske inspekcije, ljepila koja se upotrebljavaju za proizvodnju nosećih građevinskih dijelova moraju proći obimna ispitivanja u državnim institucijama za ispitivanje. Therefore, in order to receive the necessary recommendation of suitability of the construction inspection, the adhesives used for the production of load-bearing construction parts must undergo extensive tests in state testing institutions.

Osnove tih ispitivanja predstavlja DIN 68141 zajedno s normom DIN EN 301 i DIN EN 302, Dio 1 do 4. U okviru vlastite kontrole proizvodnih pogona kvalitetu proizvedenog građevnog dijela treba potvrditi ispitivanjem delaminacije prema normi DIN EN 386 i DIN EN 391. The basis of these tests is represented by DIN 68141 together with DIN EN 301 and DIN EN 302, Part 1 to 4. Within the framework of the production plant's own control, the quality of the manufactured building part should be confirmed by delamination testing according to DIN EN 386 and DIN EN 391.

Pored zahtjeva prema ljepilima s obzirom na uporabna svojstva građevnih dijelova koja su s njima proizvedena, proizvođača šperploča žele određena svojstva koja se odnose na preradu ljepila. S jedne strane vrijeme sušenja ljepila mora biti dovoljno dugo, tako da se drvene lamele na premazane ljepilom mogu prerađivati u određenom vremenskom periodu, dok se s druge strane slijepljeni građevni dijelovi moraju biti gotovi za mehanička opterećenja u što je moguće kraćem vremenu nakon njihove proizvodnje. To pretpostavlja brzo otvrdnjavanje ljepila nakon spajanja premazanih dasaka. In addition to the requirements for adhesives with regard to the functional properties of the building parts produced with them, plywood manufacturers want certain properties related to the processing of the adhesive. On the one hand, the drying time of the glue must be long enough, so that wooden lamellas coated with glue can be processed in a certain period of time, while on the other hand, the glued construction parts must be ready for mechanical loads in the shortest possible time after their production. This assumes rapid hardening of the glue after joining the coated boards.

Medu stručnjacima je općenito poznato da se za proizvodnju šperploča, koje se mogu upotrijebiti za proizvodnju nosećih građevnih elemenata, mogu upotrijebiti fenol-rezorcinske smole. Međutim, nedostatak slojevitih drvenih elemenata je to, da se spoj ljepila zbog vlastite tamne boje fenol-rezorcinske smole u gotovom građevnom dijelu pokazuje kao uzorak crnih linija, što se često odbacuje iz estetskih razloga. It is generally known among experts that phenol-resorcinol resins can be used for the production of plywood, which can be used for the production of load-bearing building elements. However, the disadvantage of layered wooden elements is that the adhesive joint, due to its own dark color of phenol-resorcinol resin, appears as a pattern of black lines in the finished construction part, which is often rejected for aesthetic reasons.

Iz švedskog patenta 78 10 982 poznati su tekući otvrđivači. Pri tome se radi o vodenim suspenzijama, koje, u odnosu na vodenu suspenziju, sadrže 1 do 25 mas. % kiseline ili tvari koja otpušta kiselinu, 30 do 90 mas. % punila, primjerice mineralnog punila kao što je kaolin, 0,5 do 10 mas. % sredstva za zgušnjavanje i 0 do 50 mas. % apsorbera formaldehida. Otvrđivač sadrži između 35 i 85 masenih postotaka suhe tvari i pri 20°C ima viskoznost od 2000 do 12000 mPa. Liquid hardeners are known from Swedish patent 78 10 982. These are aqueous suspensions, which, in relation to the aqueous suspension, contain 1 to 25 wt. % acid or acid releasing substance, 30 to 90 wt. % filler, for example mineral filler such as kaolin, 0.5 to 10 wt. % thickening agent and 0 to 50 wt. % formaldehyde absorber. The hardener contains between 35 and 85 mass percent of dry matter and at 20°C has a viscosity of 2000 to 12000 mPa.

Preporuča se upotrijebiti otvrđivač za otvrđivanje urea-formaldehidnih smola. Međutim šperploča proizvedena pomoću tog sistema veziva-otvrđivača nema potrebnu čvrstoću, naročito ako će se koristiti u vanjskoj primjeni. It is recommended to use a hardener for curing urea-formaldehyde resins. However, the plywood produced using this binder-hardener system does not have the necessary strength, especially if it will be used in external applications.

Zbog toga je zadatak predloženog izuma bio pripremiti dvokomponentno ljepilo za proizvodnju šperploča koje nemaju tamnih spojeva ljepila i koje imaju mehaničku čvrstoću koju traži građevna industrija. Therefore, the task of the proposed invention was to prepare a two-component adhesive for the production of plywood that does not have dark adhesive joints and that has the mechanical strength required by the construction industry.

U skladu s tim pripremljeno je uvodno definirano dvokomponentno ljepilo. Accordingly, the two-component adhesive defined in the introduction was prepared.

Mješavina otvrdivača (komponenta (a)) pri temperaturi od 20°C ima ponajprije viskoznost od 3000 do 10000, posebno korisno od 4000 do 8000 mPa s, i smičnu brzinu od 30 s-1. The hardener mixture (component (a)) at a temperature of 20°C preferably has a viscosity of 3000 to 10000, particularly usefully of 4000 to 8000 mPa s, and a shear rate of 30 s-1.

Mješavina otvrdivača sadrži ponajprije The hardener mixture contains first of all

a1) 5 do 12, posebno korisno 7 do 10 mas. % Bronstedt kiseline, a1) 5 to 12, especially useful 7 to 10 wt. % Bronstedt acid,

a2) 20 do 40, posebno korisno 25 do 35 mas. % mineralnog punila, a2) 20 to 40, especially useful 25 to 35 wt. % mineral filler,

a3) 2 do 8, posebno korisno 4 do 6 mas. % sredstva za zgušnjavanje, a3) 2 to 8, especially useful 4 to 6 wt. % thickening agent,

a4) 35 do 60, posebno korisno 40 do 55 mas. % vode. a4) 35 to 60, especially useful 40 to 55 wt. % water.

Prikladne Bronstedt kiseline su primjerice mineralne kiseline kao fosforna kiselina ili organske kiseline, npr. octena kiselina, propionska kiselina, oksalna kiselina ili prije svega mravlja kiselina. Suitable Bronstedt acids are, for example, mineral acids such as phosphoric acid or organic acids, such as acetic acid, propionic acid, oxalic acid or above all formic acid.

Kao mineralna punila u obzir dolazi prije svega kaolin ili drugi alumosilikati slojevite strukture. Kaolin or other aluminosilicates with a layered structure come into consideration as mineral fillers.

Kao sredstvo za zgušnjavanje prikladan je polivinil alkohol ili djelomično hidrolizirani polivinil acetat ili njihova mješavina. Polivinil alkohol može se dobiti npr. pod komercijalnim nazivom Moviol® (proizvođač Hoechst). Kod djelomično hidroliziranog polivinil acetata hidrolizirano je najmanje 50%, ponajprije 80% esterskih skupina, od prvobitno prisutnih u polivnil acetatu. Komponenta (c) upotrebljava se količinom od 1 do 20 mas. %, ponajprije 1 do 8 mas. %. Polyvinyl alcohol or partially hydrolyzed polyvinyl acetate or a mixture thereof is suitable as a thickening agent. Polyvinyl alcohol can be obtained, for example, under the commercial name Moviol® (manufacturer Hoechst). With partially hydrolyzed polyvinyl acetate, at least 50%, preferably 80%, of the ester groups originally present in polyvinyl acetate are hydrolyzed. Component (c) is used in an amount of 1 to 20 wt. %, preferably 1 to 8 wt. %.

Pored mineralnog punila mješavina otvrdivača može sadržavati i organsko punilo. Pri tome radi se općenito o punilu koje ljepilo obično sadrži, primjerice u obliku vlakana, na primjer celulozi ili drvenom brašnu. In addition to the mineral filler, the hardener mixture can also contain an organic filler. This is generally a filler that the glue usually contains, for example in the form of fibers, for example cellulose or wood flour.

U odnosu na količinu mineralnog punila u komponenti (a) mješavina obično je sadrži od 10 do 30 mas. % organskog punila. In relation to the amount of mineral filler in component (a), the mixture usually contains from 10 to 30 wt. % organic filler.

Ako se želi šperploču koja će biti posebno otporna prema djelovanju vlage, mješavina otvrdivača sadrži nadalje korisno 1 do 20, posebno korisno 3 do 8 mas. % rezorcina u odnosu na ukupnu količinu komponenata (a1) do (a4). If you want a plywood that will be particularly resistant to the effects of moisture, the hardener mixture further usefully contains 1 to 20, especially usefully 3 to 8 wt. % of resorcinol in relation to the total amount of components (a1) to (a4).

Mješavini otvrdivača mogu se nadalje dodati još uobičajene pomoćne tvari i dodaci, kao sredstva protiv pjenjenja ili emulgatori količinom od 3 mas. % u odnosu na količinu komponenata (a1) do (a4). The mixture of hardeners can be further added with the usual auxiliaries and additives, such as anti-foaming agents or emulsifiers in an amount of 3 wt. % in relation to the amount of components (a1) to (a4).

Kao komponenta (b), melaminska smola, u obzir dolaze uobičajene komercijalne smole, koje su poznate primjerice iz Ullmannove Enciklopedije tehničke kemije, 4 izdanje, svezak 7, stranice 408 i 409. As component (b), the melamine resin, common commercial resins, which are known for example from Ullmann's Encyclopedia of Technical Chemistry, 4th edition, volume 7, pages 408 and 409, come into consideration.

Pri tome radi se ponajprije o melaminskoj smoli iz This is primarily about melamine resin from

b1) melamina, b1) melamine,

b2) 2,1 do 8,4, ponajprije 2,5 do 4,6 mola formaldehida po molu melamina, b2) 2.1 to 8.4, preferably 2.5 to 4.6 moles of formaldehyde per mole of melamine,

b3) 0 do 10, ponajprije 0 do 0,5 mola daljnjeg spoja po molu formaldehida, koji s formaldehidom može ući u reakciju polikondenzacije ili poliadicije. b3) 0 to 10, preferably 0 to 0.5 moles of a further compound per mole of formaldehyde, which can enter into a polycondensation or polyaddition reaction with formaldehyde.

Melamin (komponenta b1) upotrebljava se općenito u čvrstom obliku. Melamine (component b1) is generally used in solid form.

Formaldehid (komponenta b2) upotrebljava se općenito u obliku 30 do 50%-tne mas. otopine ili u obliku paraformaldehida. Formaldehyde (component b2) is generally used in the form of 30 to 50% by weight. solution or in the form of paraformaldehyde.

Kao komponente (b3) dolaze u obzir prije svega takove koje se pri proizvodnji aminoplastičnih smola mogu upotrijebiti zajedno s formaldehidom (usporedi Ullmannovu Enciklopediju tehničke kemije, 4. izdanje, svezak 7, str. 403 do 422), dakle npr. urea, dicijanamid i gvanamini kao benzogvanamin i acetogvanamin. Prikladni su bisgvanamini kao adipo-, glutaro- ili metilolglutarobisgvanamin, kao i spojevi koji sadrže više, npr. kondenziranih, amino-triazinskih jezgri. As components (b3) come into consideration above all those that can be used together with formaldehyde in the production of aminoplastic resins (compare Ullmann's Encyclopedia of Technical Chemistry, 4th edition, volume 7, pages 403 to 422), so for example urea, dicyanamide and guanamines such as benzoguanamine and acetoguanamine. Bisguanamines such as adipo-, glutaro- or methylolglutarobisguanamine are suitable, as well as compounds containing several, for example condensed, amino-triazine nuclei.

Posebno korisno komponenta (b) sadrži Especially useful component (b) contains

b1) 15 do 30 mas. % melamina, b1) 15 to 30 wt. % melamine,

b2) 15 do 30 mas. % formaldehida, b2) 15 to 30 wt. % formaldehyde,

b3) 5 do 25 mas. % uree, dijanamida i/ili gvanamina. b3) 5 to 25 wt. % of urea, dianamide and/or guanamine.

Priprava melaminske smole vrši se ponajprije po općim uobičajenim postupcima, poznatim primjerice iz Ullmannove Enciklopedije tehničke kemije, 4. izdanje, svezak 7, str. 403 do 422. The preparation of melamine resin is primarily carried out according to general customary procedures, known for example from Ullmann's Encyclopedia of Technical Chemistry, 4th edition, volume 7, p. 403 to 422.

Kemijska pretvorba odvija se na uobičajen način u vodenoj otopini, pri čemu udio vode, u odnosu prema masenom udjelu komponenata (bi) do (b3) čini 25 do 50 mas. %. Pri tome pH vrijednost je općenito 7 do 10, ponajprije pri 9,0 do 10,0 i reakcijska temperatura se odvija pri 60 do 110, ponajprije pri 80 do 110°C. The chemical conversion takes place in the usual way in an aqueous solution, where the proportion of water, in relation to the mass proportion of components (bi) to (b3), is 25 to 50 wt. %. In this case, the pH value is generally 7 to 10, preferably at 9.0 to 10.0 and the reaction temperature takes place at 60 to 110, preferably at 80 to 110°C.

Kemijska pretvorba vrši se općenito tako dugo dok nastane krajnja melaminska smola, odnosno elastificirana melaminska smola. Pri temperaturi 20°C 60%-tna mas. vodena otopina proizvoda te kemijske pretvorbe ima obično viskoznost od 350 do 1200, ponajprije 450 do 800 mPa-s. Pod navedenim reakcijskim uvjetima reakcija općenito traje od 7 0 do 150 minuta. The chemical conversion is generally carried out as long as the final melamine resin, i.e. elastified melamine resin, is formed. At a temperature of 20°C, 60% wt. the aqueous solution of the product of this chemical conversion usually has a viscosity of 350 to 1200, preferably 450 to 800 mPa-s. Under the stated reaction conditions, the reaction generally lasts from 70 to 150 minutes.

Kemijska pretvorba se može završiti tako da se reakcijsku smjesu ohladi na temperaturu ispod 50°C, ponajprije na 20 do 30°C. The chemical conversion can be completed by cooling the reaction mixture to a temperature below 50°C, preferably to 20 to 30°C.

Općenito su poželjne vodene elastificirane melaminske smole, naročito one sa sadržajem čvrste tvari od 50 do 70 mas.%. Ako se već neposredno nakon njene proizvodnje ne raspolaže s melaminskom smolom željenog sadržaja čvrste tvari, moguće je sadržaj čvrste tvari mijenjati odstranjivanjem vode destilacijom u vakuumu, ili dodatkom vode s miješanjem. Water elastified melamine resins are generally preferred, especially those with a solids content of 50 to 70 wt.%. If melamine resin with the desired solids content is not available immediately after its production, it is possible to change the solids content by removing water by distillation in a vacuum, or by adding water with mixing.

Za povišenje elastičnosti ljepila, ono korisno sadrži alifatske poliole količinom od 5 do 18, ponajprije od 9 do 15 mas.%, u odnosu prema sadržaju čvrste tvari melaminske smole. Polioli se mogu dodati već k polaznim tvarima, koje će se upotrijebiti za proizvodnju melaminske smole, ili se mogu dodati k gotovoj melaminskoj smoli. Prije svega u obzir dolaze C2- do C20-polioli, ponajprije dioli kao etilenglikol, dietilenglikol, dipropilenglikol i butandiol, kao i trioli kao glicerin. To increase the elasticity of the adhesive, it usefully contains aliphatic polyols in an amount of 5 to 18, preferably 9 to 15 wt.%, in relation to the solids content of the melamine resin. Polyols can be added already to the starting materials, which will be used for the production of melamine resin, or they can be added to the finished melamine resin. First of all, C2- to C20-polyols come into consideration, primarily diols such as ethylene glycol, diethylene glycol, dipropylene glycol and butanediol, as well as triols such as glycerin.

Za poboljšavanje primjensko-tehnoloških svojstava ljepila, npr. reaktivnosti i savitljivosti, k melaminskoj smoli mogu se nadalje dodati sredstva za modifikaciju, kao ε-kaprolaktam i drugi amidi karbonskih kiselina količinom od 1 do 7, ponajprije od 1 do 3 mas. % u odnosu prema sadržaju čvrste tvari melaminske smole. To improve the application-technological properties of the glue, for example, reactivity and flexibility, modification agents, such as ε-caprolactam and other amides of carboxylic acids, can be added to the melamine resin in an amount of 1 to 7, preferably 1 to 3 wt. % in relation to the solid content of melamine resin.

Pored toga melaminska smola može sadržavati po potrebi do 20, ponajprije 9 do 15 mas. % organskog punila u odnosu na čvrstu tvar. Za ovo su prikladna ista organska punila koja također mogu biti sadržana u komponenti (a). In addition, melamine resin can contain up to 20, preferably 9 to 15 wt. % of organic filler in relation to solid matter. The same organic fillers that can also be contained in component (a) are suitable for this.

Dvokomponentno ljepilo prema izumu može se primijeniti tako da se miješanjem komponenata (a) i (b) proizvede tekuće ljepilo i ono se nanese barem na jednu od dviju površina koje se moraju spojiti lijepljenjem. The two-component adhesive according to the invention can be applied by mixing components (a) and (b) to produce a liquid adhesive and applying it to at least one of the two surfaces to be joined by gluing.

Tekuće ljepilo sastoji se ponajprije od komponenata (a) i (b) s masenim omjerom od 0,1:1 do 0,5:1, a posebno korisno od 0,2:1 do 0,4:1. Liquid glue consists primarily of components (a) and (b) with a mass ratio of 0.1:1 to 0.5:1, and especially useful from 0.2:1 to 0.4:1.

Priprava tekućeg ljepila iz komponenata (a) i (b) nije kritična i vrši se svrhovito miješanjem jedne komponente u drugoj. The preparation of liquid glue from components (a) and (b) is not critical and is done purposefully by mixing one component in another.

Posve osobitu prednost daje se ljepilima za lijevanje slijedećeg sastava, pri čemu se navedeni sastojci nadopunjuju na 100 mas. dijelova: Particular preference is given to adhesives for casting with the following composition, whereby the listed ingredients are added to 100 wt. parts:

0,5 do 2,5 mas. dijela mravlje kiseline, 0.5 to 2.5 wt. part of formic acid,

0,3 do 1,5 mas. dijela sredstva za zgušnjavanje, 0.3 to 1.5 wt. part of the thickening agent,

12 do 25 mas. dijelova melamina u obliku melaminske smole, 12 to 25 wt. parts of melamine in the form of melamine resin,

4 do 21 mas. dijela uree u obliku melaminske smole, 12 do 25 mas. dijelova formaldehida u obliku melaminske smole, 4 to 21 wt. part of urea in the form of melamine resin, 12 to 25 wt. parts of formaldehyde in the form of melamine resin,

4 do 12 mas. dijelova organskog punila, 4 to 12 wt. parts of organic filler,

3 do 13 mas. dijelova C2 do C20-poliola, 3 to 13 wt. parts of C2 to C20-polyol,

0 do 5 mas. dijelova sredstva za modifikaciju, 0 to 5 wt. parts of means for modification,

0 do 4 mas. dijela rezorcina, 0 to 4 wt. part of resorcinol,

3 do 9 mas. dijelova mineralnog punila, 3 to 9 wt. parts of mineral filler,

ostatak do 100 mas. je dijelova voda. the rest up to 100 wt. is parts of water.

Dvokomponentna ljepila prema izumu prikladna su prije svega za lijepljenje masivnih drvenih dijelova. Posebno su prikladna za proizvodnju šperploča izgrađenih od više, ponajprije 5 do 70 drvenih lamela, npr. drvenih dasaka debljine od 10 do 43 mm. The two-component adhesives according to the invention are primarily suitable for gluing massive wooden parts. They are particularly suitable for the production of plywood made of several, primarily 5 to 70 wooden lamellas, for example wooden planks with a thickness of 10 to 43 mm.

Lijepljenje drvenih lamela vrši se svrhovito po jednom od postupaka općenito poznatih u drvnoj industriji. The gluing of wooden lamellas is done purposefully according to one of the procedures generally known in the wood industry.

Pri tome, može se primjerice postupiti tako, da se At the same time, one can, for example, act in such a way that

Ia: miješanjem komponenata (a) i (b) pripremi tekuće ljepilo. Ia: by mixing components (a) and (b), prepare liquid glue.

IIa: pripreme se premazane drvene lamele, pri čemu se tekuće ljepilo nanosi jednostrano ili obostrano na drvene lamele, i IIa: coated wooden slats are prepared, whereby liquid glue is applied on one or both sides to the wooden slats, and

IIIa: premazane drvene lamele dovedu se u dodir međusobno ili se dovedu u dodir s nepremazanim drvenim lamelama tako da se sloj ljepila nalazi između dviju drvenih lamela koje se želi slijepiti, IIIa: the coated wooden lamellas are brought into contact with each other or they are brought into contact with uncoated wooden lamellas so that the glue layer is between the two wooden lamellas to be glued,

pod uvjetom, da se radni postupci Ia do lila provedu unutar vremenskog perioda od 45 do 150 minuta, ponajprije od 60 do 120 minuta, on the condition that work procedures Ia to III are carried out within a time period of 45 to 150 minutes, preferably from 60 to 120 minutes,

ili or

Ib: pripreme se premazane drvene lamele, pri čemu se na drvene lamele jednostrano, ili obostrano, nanose međusobno odvojene komponente (a) i (b) , tako da se komponenta (a) , kao također i komponenta (b) nanese na jednu ili na obje strane drvene lamele, i Ib: coated wooden lamellas are prepared, whereby separately components (a) and (b) are applied to the wooden lamellas on one or both sides, so that component (a) and also component (b) are applied to one or on both sides of the wooden lamella, i

IIb: premazane drvene lamele dovedu se u dodir međusobno, ili s nepremazanim drvenim lamelama, tako da se obje komponente ljepila uvijek nalaze između 2 drvene lamele, ili IIb: coated wooden lamellas are brought into contact with each other, or with uncoated wooden lamellas, so that both components of the glue are always between 2 wooden lamellas, or

Ic: pripreme se premazane drvene lamele, pri čemu se komponente (a) i (b) međusobno odvojeno, jednostrano ili obostrano, nanose na drvene lamele, tako da se uvijek samo jedna komponenta dvokomponentnog sistema ljepila nalazi na istoj strani drvene lamele, i Ic: coated wooden lamellas are prepared, whereby components (a) and (b) are applied to the wooden lamellas separately, on one side or on both sides, so that only one component of the two-component adhesive system is always on the same side of the wooden lamella, and

IIc: premazane drvene lamele dovedu se međusobno u dodir tako, da se uvijek obje komponente (a) i (b) nalaza između dviju premazanih drvenih lamela. IIc: the coated wooden lamellas are brought into contact with each other in such a way that both components (a) and (b) are always located between the two coated wooden lamellas.

Kod odvojenog nanošenja komponenata (a) i (b), u fazi IIb ili IIc, na jedinicu površine drvene lamele nanose se komponente (a) do (b) u omjeru 0,2:1,0 do 0,5:1,0, ponajprije 0,3:1,0 do 0,4:1,0. When components (a) and (b) are applied separately, in phase IIb or IIc, components (a) to (b) are applied in a ratio of 0.2:1.0 to 0.5:1.0 to the surface unit of the wooden lamella. , preferably 0.3:1.0 to 0.4:1.0.

Ukupna količina komponenata (a) i (b), odnosno tekućeg ljepila koje se nanosi na drvene lamele u postupcima IIb, IIc, odnosno Ia, iznosi uobičajeno 350 do 500 g/m2. The total amount of components (a) and (b), i.e. liquid glue that is applied to wooden lamellas in procedures IIb, IIc, and Ia, is usually 350 to 500 g/m2.

Drvene lamele, premazane s tekućim ljepilom, odnosno pojedinačnim komponentama, dovode se u međusobni dodir postupcima IIIa, IIb, odnosno IIc, općenito pod djelovanjem pritiska od 0,6 do 1,0 N/mm2 . Taj pritisak drži se općenito tijekom vremenskog perioda potrebnog za otvrdnjavanje ljepila, a to je pri 20°C pribl. 112 - 14 sati. Otvrdnjavanje se obično provodi pri sobnoj temperaturi, a pri višim temperaturama se skraćuje odgovarajući vremenu otvrdnjavanja. Wooden lamellas, coated with liquid glue, or individual components, are brought into contact with each other by procedures IIIa, IIb, or IIc, generally under the action of pressure from 0.6 to 1.0 N/mm2. This pressure is generally maintained during the time period required for the glue to harden, which at 20°C is approx. 112 - 2 p.m. Curing is usually carried out at room temperature, and at higher temperatures it is shortened according to the curing time.

Tekuća ljepila posebno se obilježavaju vremenom njihove upotrebljivosti nakon njihove priprave, tj. miješanja dotičnih komponenata (a) i (b). Ona se nadalje obilježavaju naročito reološkin svojstvima. Na osnovi njihove strukturne viskoznosti i tiksotropije, ona ne cure po okomito postavljenoj drvenoj lameli dolje i ne izvlače se nikakve niti. Liquid adhesives are specially marked by the time of their use after their preparation, i.e. mixing the relevant components (a) and (b). Furthermore, they are characterized by special rheological properties. Based on their structural viscosity and thixotropy, they do not leak down the vertically placed wooden lamella and no threads are pulled out.

Šperploče proizvedene s dvokomponentnim ljepilima imaju posebno odlična mehanička svojstva, koja se zadržavaju također i u vanjskoj primjeni. Plywood produced with two-component adhesives has particularly excellent mechanical properties, which are retained also in external use.

PRIMJERI EXAMPLES

Primjer 1 Example 1

Priprava mješavina otvrdivača Preparation of hardener mixtures

Mješavina otvrdivača I Hardener mixture I

Jedno za drugim 4000 g 10%-tne otopine polivinil alkohola, 642 g vode, 1058 g 85%-tne mravlje kiseline, 200 g propilenkarbonata, 600 g rezorcina, 3000 g kaolina i 500 g celuloznih vlakana temeljito je izmiješano s brzohodnom miješalicom i potpuno homogenizirano. One after the other, 4000 g of 10% polyvinyl alcohol solution, 642 g of water, 1058 g of 85% formic acid, 200 g of propylene carbonate, 600 g of resorcinol, 3000 g of kaolin and 500 g of cellulose fibers were thoroughly mixed with a high-speed mixer and completely homogenized.

Gotov otvrdivač imao je slijedeće značajke: The finished hardener had the following features:

gustoća pri 20°C [g/ml]: 1,315, density at 20°C [g/ml]: 1.315,

viskoznost pri 20°C, smicanje 30/s, [mPa s] 4802 viscosity at 20°C, shear 30/s, [mPa s] 4802

pH vrijednost pri 20°C, mjerena sa staklenom elektrodom, 1,3. pH value at 20°C, measured with a glass electrode, 1.3.

Mješavina otvrdivača I Hardener mixture I

Jedno za drugim 5320 g 10,6%-tne otopine polivinil alkohola, 239 g vode, 941 g 85%-tne mravlje kiseline, 3000 g kaolina i 500 g celuloznih vlakana temeljito je izmiješano s brzohodnom miješalicom i potpuno homogenizirano. One after the other, 5320 g of 10.6% polyvinyl alcohol solution, 239 g of water, 941 g of 85% formic acid, 3000 g of kaolin and 500 g of cellulose fibers were thoroughly mixed with a high-speed mixer and completely homogenized.

Gotovi otvrdivač imao je slijedeće značajke: The finished hardener had the following features:

gustoća pri 20°C [g/ml]: 1,265 density at 20°C [g/ml]: 1.265

viskoznost pri 20°C, smicanje 30/s, [mPa-s]: 5659 viscosity at 20°C, shear 30/s, [mPa-s]: 5659

pH vrijednost pri 20°C, mjerena sa staklenom elektrodom: 1,4. pH value at 20°C, measured with a glass electrode: 1.4.

Priprava melaminske smole Preparation of melamine resin

Melaminska smola A Melamine resin A

Mješavinu od 2515 g (33,5 mola) 40%-tne otopine formaldehida, 2575 g urea-formaldehidnog predkondenzata (10,7 molova uree i 42,9 g formaldehida) , 300 g vode, 15 g dietanolamina i 2380 g (18,9 molova) melamina zagrije se na 95°C i kondenzira pri to] temperaturi 75 minuta. Nakon toga se ohladi na 87°C i dalje se kondenzira do viskoznosti od pribl. 900 mPa s (mjerene pri 20°C). Sve vrijeme trajanja kondenzacije pH vrijednost se stalno drži konstantnom pri pribl. 9,5. Kad se ohladi na 50°C doda se 415 g (6, 9 molova) uree i dalje se ohladi na sobnu temperaturu. Viskoznost mješavine iznosi 715 mPa-s (mjereno pri 20°C) i ona sadrži 62,5 mas.% čvrste tvari. U tu smolu homogeno je umiješano 100 g kaprolaktama, 600 g etilenglikola kao i 850 g celuloze. A mixture of 2515 g (33.5 moles) of a 40% formaldehyde solution, 2575 g of urea-formaldehyde precondensate (10.7 moles of urea and 42.9 g of formaldehyde), 300 g of water, 15 g of diethanolamine and 2380 g (18, 9 moles) of melamine is heated to 95°C and condensed at that temperature for 75 minutes. It is then cooled to 87°C and further condensed to a viscosity of approx. 900 mPa s (measured at 20°C). Throughout the duration of the condensation, the pH value is constantly kept constant at approx. 9.5. When it cools to 50°C, 415 g (6.9 moles) of urea is added and it is further cooled to room temperature. The viscosity of the mixture is 715 mPa-s (measured at 20°C) and it contains 62.5 wt.% solids. 100 g of caprolactam, 600 g of ethylene glycol and 850 g of cellulose were homogeneously mixed into that resin.

Gotova smola imala je slijedeće značajke: The finished resin had the following features:

viskoznost: 2480 mPa-s viscosity: 2480 mPa-s

sadržaj čvrste tvari: 65,2 mas. % solid content: 65.2 wt. %

pH vrijednost: 9,2 pH value: 9.2

vrijeme želiranja (3 g 34%-tne mravlje kiseline, 40°C): 5 minuta. gelation time (3 g of 34% formic acid, 40°C): 5 minutes.

Melaminska smola B Melamine resin B

Mješavinu od 2515 g (33,5 mola) 40%-tne otopine formaldehida, 2575 g urea-formaldehidnog predkondenzata (10,7 molova uree i 42,9 mola formaldehida) , 300 g vode, 15 g dietanolamina i 2380 g (18,9 molova) melamina zagrije se na 93°C i kondenzira se pri toj temperaturi 90 minuta do viskoznosti od pribl. 600 mPa s (mjerene pri 20°C). Sve vrijeme trajanja kondenzacije pH vrijednost se stalno drži konstantom. Kad se ohladi na 50°C doda se 415 g (6,9 molova) uree i dalje se ohladi na sobnu temperaturu. A mixture of 2515 g (33.5 moles) of a 40% formaldehyde solution, 2575 g of urea-formaldehyde precondensate (10.7 moles of urea and 42.9 moles of formaldehyde), 300 g of water, 15 g of diethanolamine and 2380 g (18, 9 moles) of melamine is heated to 93°C and condensed at that temperature for 90 minutes to a viscosity of approx. 600 mPa s (measured at 20°C). Throughout the duration of the condensation, the pH value is constantly kept constant. When it cools to 50°C, 415 g (6.9 moles) of urea is added and it is further cooled to room temperature.

Viskoznost mješavine iznosila je 548 mPa s (mjereno pri 20°C) i ona je sadržavala 62,4 mas.% čvrste tvari. U tu smolu homogeno je umiješano 850 g dietilenglikola kao i 950 g celuloze. The viscosity of the mixture was 548 mPa s (measured at 20°C) and it contained 62.4 wt.% solids. 850 g of diethylene glycol and 950 g of cellulose were homogeneously mixed into that resin.

Gotova smola imala je slijedeće značajke: The finished resin had the following features:

viskoznost: 2380 mPa s viscosity: 2380 mPa s

sadržaj čvrste tvari: 65,6 mas. % solid content: 65.6 wt. %

pH vrijednost: 9,1 pH value: 9.1

vrijeme želiranja (3 g 34%-tne mravlje kiseline, 40°C): 58 minuta. gelling time (3 g of 34% formic acid, 40°C): 58 minutes.

Melaminska smola C Melamine resin C

Mješavinu od 4550 g (60,7 molova) 40%-tne otopine formaldehida, 350 g urea-formaldehidnog predkondenzata (1,5 mola uree i 5, 8 formaldehida), 15 g dietiletanolamina i 2700 g (21,4 mola) melamina zagrije se na 97°C i kondenzira se pri toj temperaturi do viskoznosti od pribl. 580 mPa s (mjerene pri 20°C). Sve vrijeme tijekom trajanja kondenzacije pH vrijednost se stalno drži konstantnom. Kad se ohladi na 50°C doda se 438 g (7,3 molova) uree i dalje se ohladi na sobnu temperaturu. Viskoznost mješavine iznosila je 450 mPa s (mjereno pri 20°C) i ona je sadržavala 59,1 mas.% čvrste tvari. U tu smolu homogeno je umiješano 200 g kaprolaktama, 300 g 1,4-butandiola, 500 g etilenglikola kao i 947 g celuloze. A mixture of 4550 g (60.7 moles) of a 40% formaldehyde solution, 350 g of urea-formaldehyde precondensate (1.5 moles of urea and 5.8 formaldehyde), 15 g of diethylethanolamine and 2700 g (21.4 moles) of melamine is heated is at 97°C and condenses at that temperature to a viscosity of approx. 580 mPa s (measured at 20°C). All the time during the condensation, the pH value is constantly kept constant. When it cools to 50°C, 438 g (7.3 moles) of urea are added and it is further cooled to room temperature. The viscosity of the mixture was 450 mPa s (measured at 20°C) and it contained 59.1 wt.% solids. 200 g of caprolactam, 300 g of 1,4-butanediol, 500 g of ethylene glycol and 947 g of cellulose were homogeneously mixed into that resin.

Gotova smola imala je slijedeće značajke: The finished resin had the following features:

viskoznost: 2270 mPa-s viscosity: 2270 mPa-s

sadržaj čvrste tvari: 63,5 mas. % solid content: 63.5 wt. %

pH vrijednost: 9,4 pH value: 9.4

vrijeme želiranja (3 g 34%-tne mravlje kiseline, 40°C): 42 minuta. gelation time (3 g of 34% formic acid, 40°C): 42 minutes.

Fizička svojstva mješavine otvrdivača i melaminske smole određena su na slijedeći način: The physical properties of the mixture of hardener and melamine resin are determined as follows:

Viskoznosti su izmjerene po DIN-u 53019 s rotacijskim viskozimetrom pri 20°V. Sadržaj čvrste tvari izmjeren je po DIN-u 12605, pri čemu se 1 g tvari odvagne u ravnu posudicu za vaganje promjera 3,5 cm i suši se 2 sata pri 120°C u sušnici. Viscosities were measured according to DIN 53019 with a rotary viscometer at 20°V. The solids content was measured according to DIN 12605, whereby 1 g of the substance was weighed into a flat weighing container with a diameter of 3.5 cm and dried for 2 hours at 120°C in an oven.

pH vrijednost izmjerena je po DIN-u 53785/ISO 1148. The pH value was measured according to DIN 53785/ISO 1148.

Za mjerenje vremena želiranja 100 g melaminske smole pomiješano je s 3 g 34%-tne mravlje kiseline i zagrijano na 40°C. Vrijeme želiranja je vrijeme između dodatka otvrdivača i skrućivanja uzorka. To measure the gelation time, 100 g of melamine resin was mixed with 3 g of 34% formic acid and heated to 40°C. The gelling time is the time between the addition of the hardener and the solidification of the sample.

Primjensko-tehnološka ispitivanja Applied technological tests

Za primjensko-tehnološka ispitivanja iz 100 mas. dijelova melaminske smole i 20 mas. dijelova mješavine otvrdivača pripremljeno je tekuće ljepilo gotovo za upotrebu. Ispitivanja su provedena po propisima DIN 68141, izdanje iz listopada 1969., kao i DIN EN 391, izdanje iz studenog 1990., povezano s DIN EN 386, izdanje iz studenog 1990. Pojedinačno je bilo ispitano slijedeće: For applied-technological tests from 100 wt. parts of melamine resin and 20 wt. parts of the hardener mixture, ready-to-use liquid glue is prepared. The tests were carried out according to the regulations DIN 68141, edition from October 1969, as well as DIN EN 391, edition from November 1990, connected with DIN EN 386, edition from November 1990. The following were tested individually:

ispitivanje I, trajanje upotrebljivosti, DIN 68141, točka 2.1.2, test I, service life, DIN 68141, point 2.1.2,

ispitivanje II, vrijeme sušenja na otvorenom, DIN 68141, točka 2.1.3, test II, outdoor drying time, DIN 68141, point 2.1.3,

ispitivanje III, utjecaj debljine sloja i različitog redoslijeda slojeva na čvrstoću spoja, DIN 68141, točka 2.1.1 (A) i 2.2.3 (B), test III, influence of layer thickness and different order of layers on joint strength, DIN 68141, point 2.1.1 (A) and 2.2.3 (B),

ispitivanje IV, utjecaj klime u prostoriji na brzinu spajanja, DIN 68141, točka 2.3a) nakon 24 sata, test IV, the influence of the room climate on the joining speed, DIN 68141, point 2.3a) after 24 hours,

ispitivanje V, postojanost prema raslojavanju, DIN, prijedlog EN 386, test V, resistance to delamination, DIN, proposal EN 386,

ispitivanje VI, optička ocjena boje spoja ljepila i njegovo potamnjivanje. test VI, optical evaluation of the color of the adhesive joint and its darkening.

Ispitivanja su provedena na slijedećim tekućim ljepilima: Tests were performed on the following liquid adhesives:

tekuće ljepilo 1, liquid glue 1,

melaminska smola A s mješavinom otvrdivača 1, melamine resin A with hardener mixture 1,

tekuće ljepilo 2, liquid glue 2,

melaminska smola C s mješavinom otvrdivača 2, melamine resin C with hardener mixture 2,

tekuće ljepilo 3. liquid glue 3.

Uobičajena komercijalna fenol-rezorcin-formaldehidna smola (tekuće ljepilo Kuresin® 460 tvrtke BASF AG) s uobičajenim komercijalnim otvrdivačem za fenolne smole na osnovi paraformaldehida i male količine karbonske kiseline (praškasti otvrđivač Kuresin® 466 tvrtke BASF AG). A common commercial phenol-resorcinol-formaldehyde resin (liquid adhesive Kuresin® 460 from BASF AG) with a common commercial hardener for phenolic resins based on paraformaldehyde and a small amount of carbonic acid (powder hardener Kuresin® 466 from BASF AG).

Rezultati primjensko-tehnoloških ispitivanja mogu se vidjeti u tablicama 1 i 2. The results of applied technological tests can be seen in tables 1 and 2.

Tablica 1: Table 1:

Čvrstoće spojeva (N/mm2) sljepljivanjem prema DIN-u 68141 s različitim debljinama spoja nakon slijeda polaganja prema DIN-u 53254, izdanje iz siječnja 1987. Joint strengths (N/mm2) by bonding according to DIN 68141 with different joint thicknesses after the laying sequence according to DIN 53254, January 1987 edition.

[image] [image]

Tablica 2: Table 2:

Rezultati ispitivanja trajanja upotrebljivosti i vrijeme sušenja na otvorenom po DIN-u 68141 kao i raslojavanje po DIN pr EN 391 i 386 i optička ocjena boje sloja ljepila. Test results of service life and outdoor drying time according to DIN 68141 as well as delamination according to DIN pr EN 391 and 386 and optical evaluation of the color of the adhesive layer.

[image] [image]

Claims (8)

1. Dvokomponentno ljepilo prikladno za proizvodnju šperploča, naznačeno time, da se sastoji od a) vodene mješavine otvrdivača (komponenta (a)), koja sadrži a1) 3 do 15 mas. % Bronstedt kiseline, a2) 20 do 40 mas. % mineralnog punila, a3) 2 do 8 mas. % sredstva za zgušnjavanje, a4) 4 0 do 60 mas. % vode i b) melaminske smole (komponenta (b)).1. A two-component adhesive suitable for the production of plywood, characterized by the fact that it consists of a) aqueous mixture of hardener (component (a)), which contains a1) 3 to 15 wt. % Bronstedt acid, a2) 20 to 40 wt. % mineral filler, a3) 2 to 8 wt. % thickening agent, a4) 4 0 to 60 wt. % water and b) melamine resins (component (b)). 2. Dvokomponentno ljepilo prema zahtjevu 1, naznačeno time, da vodena mješavina otvrdivača (a) dodatno sadrži organsko punilo.2. Two-component adhesive according to claim 1, characterized in that the aqueous mixture of hardener (a) additionally contains an organic filler. 3. Dvokomponentno ljepilo prema zahtjevu 1 ili 2, naznačeno time, da komponenta (a) dodatno sadrži rezorcin.3. Two-component adhesive according to claim 1 or 2, characterized in that component (a) additionally contains resorcinol. 4. Dvokomponentno ljepilo prema zahtjevima 1 do 3, naznačeno time, da sadrži komponentu (b) koja se sastoji iz b1) melamina, b2) 2,1 do 8,4 molova formaldehida po molu melamina, b3) 0 do 1,0, ponajprije 0 do 0,5 mola daljnjeg spoja po molu formaldehida, koji s formaldehidom može ući u reakciju polikondenzacije ili poliadicije.4. Two-component adhesive according to claims 1 to 3, characterized in that it contains component (b) consisting of b1) melamine, b2) 2.1 to 8.4 moles of formaldehyde per mole of melamine, b3) 0 to 1.0, preferably 0 to 0.5 mol of further compound per mole of formaldehyde, which can enter into a polycondensation or polyaddition reaction with formaldehyde. 5. Postupak za proizvodnju šperploča izgrađenih od drvenih lamela upotrebom dvokomponentnog ljepila prema zahtjevima 1 do 4, naznačen time, da se Ia: miješanjem komponenata (a) i (b) pripremi tekuće ljepilo, IIa: pripreme se premazane drvene lamele, pri čemu se tekuće ljepilo nanosi jednostrano ili obostrano na drvene lamele, i IIIa: premazane drvene lamele dovedu se u dodir međusobno ili se dovedu u dodir s nepremazanim drvenim lamelama tako da se sloj ljepila nalazi između dviju drvenih lamela koje se želi slijepiti, pod uvjetom, da se radni postupci Ia do lila provedu unutar vremenskog perioda od 45 do 150 minuta.5. Process for the production of plywood made of wooden lamellas using a two-component adhesive according to claims 1 to 4, characterized by the fact that Ia: by mixing components (a) and (b), prepare liquid glue, IIa: coated wooden slats are prepared, whereby liquid glue is applied on one or both sides to the wooden slats, and IIIa: the coated wooden lamellas are brought into contact with each other or they are brought into contact with uncoated wooden lamellas so that the glue layer is between the two wooden lamellas to be glued, under the condition that work procedures Ia to Lila are carried out within a time period of 45 to 150 minutes. 6. Postupak za proizvodnju šperploča upotrebom dvokomponentnog ljepila prema zahtjevima 1 do 4, naznačen time, da se Ib: pripreme premazane drvene lamele, pri čemu se na drvene lamele jednostrano, ili obostrano, nanose međusobno odvojene komponente (a) i (b) , tako da se komponenta (a) , kao također i komponenta (b) nanese na jednu ili na obje strane drvene lamele, i IIb: premazane drvene lamele dovedu se u dodir međusobno, ili s nepremazanim drvenim lamelama, tako da se obje komponente ljepila uvijek nalaze između 2 drvene lamele.6. Method for the production of plywood using a two-component adhesive according to claims 1 to 4, characterized in that Ib: preparation of coated wooden lamellas, whereby separate components (a) and (b) are applied to the wooden lamellas on one or both sides, so that component (a) and also component (b) are applied to one or both sides of the wooden lamella, i IIb: coated wooden lamellas are brought into contact with each other, or with uncoated wooden lamellas, so that both components of the glue are always between 2 wooden lamellas. 7. Postupak za proizvodnju šperploča izgrađenih od drvenih lamela upotrebom dvokomponentnog ljepila prema zahtjevima 1 do 4, naznačen time, da se Ic: pripreme premazane drvene lamele, pri čemu se komponente (a) i (b) međusobno odvojeno, jednostrano ili obostrano, nanose na drvene lamele, tako da se uvijek samo jedna komponenta dvokomponentnog sistema ljepila nalazi na istoj strani drvene lamele, i IIc: premazane drvene lamele dovedu se međusobno u dodir tako, da se uvijek obje komponente (a) i (b) nalaza između dviju premazanih drvenih lamela.7. Process for the production of plywood made of wooden lamellas using a two-component adhesive according to claims 1 to 4, characterized by the fact that Ic: preparations of coated wooden lamellas, whereby components (a) and (b) are applied to the wooden lamellas separately, on one side or both sides, so that only one component of the two-component adhesive system is always on the same side of the wooden lamella, and IIc: the coated wooden lamellas are brought into contact with each other so that both components (a) and (b) are always located between the two coated wooden lamellas. 8. Šperploča naznačena time, da je proizvedena jednim od postupak prema zahtjevima 5 do 7.8. Plywood indicated by the fact that it was produced by one of the procedures according to requirements 5 to 7.
HR19603988.6A 1996-02-05 1997-02-04 Two-component glue system for the production of laminated wood panels HRP970066A2 (en)

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DE69902664T2 (en) * 1998-06-22 2003-04-10 Akzo Nobel Nv APPARATUS AND METHOD FOR APPLYING GLUE
DE10062415A1 (en) 2000-12-14 2002-06-20 Bayer Ag wood adhesives
NO324322B1 (en) 2001-02-26 2007-09-24 Dynea Oy Use of hardener as well as method of gluing
DE102005001565A1 (en) 2005-01-13 2006-07-27 Bayer Materialscience Ag wood adhesives
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DE19603988A1 (en) 1997-08-07
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WO1997029161A1 (en) 1997-08-14
DE59700553D1 (en) 1999-11-18

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