EP1554095A1

EP1554095A1 - Method for the production of colored osb plates

Info

Publication number: EP1554095A1
Application number: EP03757913A
Authority: EP
Inventors: Juliane Krüsemann; Manfred Siegler; Andreas Stohr
Original assignee: BASF SE
Current assignee: BASF SE
Priority date: 2002-10-15
Filing date: 2003-10-06
Publication date: 2005-07-20
Anticipated expiration: 2023-10-06
Also published as: WO2004035277A1; CN1774320A; BR0315133A; CN100396458C; AU2003273948A1; DE10248083A1; US20060065996A1; BR0315133B1; JP2006516106A; EP1554095B1; DE50313375D1; ATE493246T1

Abstract

A process for producing colored oriented strand board, which comprises the wood strands which serve as a base material for oriented strand board being contacted, before or after-drying, with a liquid colorant preparation, then conventionally resinated, and formed into three-layered mats and these three-layered mats being hot-pressed into board having a center layer and two outside layers.

Description

Process for the production of colored OSB boards

description

The present invention relates to a new process for the production of colored OSB panels.

In the area of wood-based materials, the market for OSB boards (Oriented Strand Boards) is growing. So far, OSB panels have mainly been used in the construction and packaging sectors.

Because of their attractive surface structure, which is characterized by the

Orientation of the coarse wood fibers (strands), the OSB boards are now increasingly used in the decorative area, e.g. in exhibition stand construction as well as for floors and furniture.

For these applications, there is a desire to color the OSB panels.

When manufacturing OSB panels, strands are first produced, which are dried in continuous dryers. Before or after drying, the strands are divided into two fractions (middle layer and top layer), which are glued separately in drum mixers. Aminoplasts (urea or urea-melamine-formaldehyde resins) or, in particular for the middle class, isocyanates (MDI: diphenylmethane-4,4'-diisocyanate) are used as binders. The glued strands are poured into three-layer mats in special pouring systems, whereby the fiber directions of the middle and top layers are as crosswise as possible. The poured mats are then pressed into sheets in continuous or discontinuous hot presses at 180 to 230 ° C.

The known processes for coloring OSB boards, in which the colorant is applied to the strands together with the binder or separately from it when gluing, lead to only moderate success, since only dyed boards are obtained.

The invention was therefore based on the object of developing a method by means of which OSB panels can be colored as evenly as possible, while at the same time the typical “wood structure” is to remain visible.

Accordingly, a process for the production of colored OSB boards has been found, which is characterized in that the wooden strands serving as the base material for the OSB boards are dried with a liquid colorant preparation before or after drying brings in contact, then glued in the usual way, poured into three-layer mats and these hot pressed to plates consisting of a middle layer with two cover layers.

The coloring of the beaches is preferably carried out according to the invention continuously by spraying or dipping into the colorant solution or dispersion.

You can only color the strands for one or both cover layers, only the strands for the middle layer or the strands of all three layers. If several layers are colored, different or the same color tones can be selected for the individual layers.

It is essential for the method according to the invention that the coloring of the beaches is carried out prior to the gluing, contrary to the procedure which is otherwise customary for coloring wood-based materials, in which coloring and gluing take place in parallel. In this way, uniformly and intensely colored OSB panels are obtained.

The liquid colorant preparation used in the process according to the invention can be a pure pigment preparation, a pure dye preparation or a preparation containing both pigment and dye.

Both pigment and dye-containing preparations are preferably used, since they give particularly strong, brilliant and lightfast colorations. Preparations which have a dye content of 0.5 to 10% by weight, based on the pigment, are particularly preferred.

The colorant preparations preferred according to the invention usually contain (A) at least one pigment, (B) at least one dye, (C) at least one dispersant and (D) water or a mixture of water and at least one water retention agent.

The pure pigment or dye preparations which can likewise be used according to the invention generally also contain these constituents, the dispersant (C) being dispensable, in particular for dye preparations in which the dye is present in solution.

Component (A) of the colorant preparations preferred according to the invention can be organic or inorganic pigments. Of course, the colorant preparations can also Contain mixtures of different organic or different inorganic pigments or mixtures of organic and inorganic pigments.

The pigments are preferably in finely divided form. Accordingly, the pigments usually have average particle sizes of 0.1 to 5 μm, in particular 0.1 to 3 μm and especially 0.1 to 1 μm.

The organic pigments are usually organic colored and black pigments. Inorganic pigments can also be color pigments (colored, black and white pigments) and gloss pigments.

The following are examples of suitable organic color pigments:

Monoazo Pigments: C.I. Pigment brown 25;

C.I. Pigment Orange 5, 13, 36, 38, 64 and 67;

C.I. Pigment Red 1, 2, 3, 4, 5, 8, 9,

12, 17, 22, 23, 31, 48: 1, 48: 2, 48: 3,

48: 4, 49, 49: 1, 51: 1, 52: 1, 52: 2, 53,

53: 1, 53: 3, 57: 1, 58: 2, 58: 4, 63,

112, 146, 148, 170, 175, 184, 185,

187, 191: 1, 208, 210, 245, 247 and

251;

C.I. Pigment Yellow 1, 3, 62, 65, 73,

74, 97, 120, 151, 154, 168, 181, 183 and 191;

C.I. Pigment violet 32;

Disazo Pigments: C.I. Pigment Orange 16, 34, 44 and

72;

C.I. Pigment Yellow 12, 13, 14, 16,

17, 81, 83, 106, 113, 126, 127, 155,

174, 176, 180 and 188;

Disazo condensation pigments: C.I. Pigment Yellow 93, 95 and 128;

C.I. Pigment Red 144, 166, 214, 220,

221, 242 and 262;

C.I. Pigment Brown 23 and 41;

- Anthanthrone pigment: CI Pigment Red 168; Anthraquinone pigments: CI Pigment Yellow 147, 177 and 199;

C.I. Pigment violet 31;

- Anthrapyrimidine pigments: C.I. Pigment yellow 108;

- Quinacridone pigments: C.I. Pigment Orange 48 and 49;

C.I. Pigment Red 122, 202, 206 and

209;

C.I. Pigment violet 19;

Quinophthalone Pigments: C.I. Pigment yellow 138;

- Diketopyrrolopyrrole pimgente: C.I. Pigment Orange 71, 73 and 81; C.I. Pigment Red 254, 255, 264, 270 and 272;

- Dioxazine pigments: C.I. Pigment violet 23 and 37; C.I. Pigment blue 80;

- Flavanthrone pigments: C.I. Pigment yellow 24;

- Indanthrone pigments: C.I. Pigment Blue 60 and 64;

Isoindoline Pigments: C.I. Pigments Orange 61 and 69;

C.I. Pigment Red 260;

C.I. Pigment Yellow 139 and 185;

- Isoindolinone pigments: C.I. Pigment Yellow 109, 110 and 173;

Isoviolanthrone Pigments: C.I. Pigment violet 31;

- Metal complex pigments: C.I. Pigment Red 257;

C.I. Pigment Yellow 117, 129, 150,

153 and 177;

C.I. Pigment green 8;

- Perinone pigments: C.I. Pigment orange 43; C.I. Pigment Red 194;

- Perylene pigments: C.I- Pigment Black 31 and 32;

C.I. Pigment Red 123, 149, 178, 179,

190 and 224;

CI Pigment Violet 29; - phthalocyanine pigments: CI Pigment Blue 15, 15: 1, 15: 2,

15: 3, 15: 4, 15: 6 and 16; C.I. Pigment green 7 and 36;

- Pyranthrone pigments: C.I. Pigment Orange 51; C.I. Pigment red 216;

- Pyrazoloquinazolone pigments: C.I. Pigment orange 67; C.I. Pigment Red 251;

- Thioindigo pigments: C.I. Pigment Red 88 and 181; C.I. Pigment violet 38;

Triarylcarboniu - pigments: C.I. Pigment Blue 1, 61 and 62;

C.I. Pigment green 1;

C.I. Pigment Red 81, 81: 1 and 169;

C.I. Pigment violet 1, 2, 3 and 27;

- C.I. Pigment Black 1 (aniline black);

- C.I. Pigment Yellow 101 (Aldazine Yellow);

C.I. Pigment brown 22,

Suitable inorganic color pigments include:

- White pigments: titanium dioxide (C.I. Pigment White 6), zinc white, colored zinc oxide; Zinc sulfide, lithopone;

Black pigments: iron oxide black (C.I. Pigment Black 11), iron-manganese black, spinel black (C.I. Pigment Black 27); Carbon black (C.I. Pigment Black 7);

Colored pigments: chromium oxide, chromium oxide hydrate green; Chrome green (C.I. Pigment Green 48); Cobalt green (C.I. Pigment Green 50); Ultramar green;

Cobalt blue (CI Pigment Blue 28 and 36; CI Pigment Blue 72); Ultramarine blue; Manganese blue; Ultramarine violet; Cobalt and manganese violet;

Iron oxide red (C.I. Pigment Red 101); Cadmium sulfoselenide (C.I. Pigment Red 108); Cerium sulfide (C.I. Pigment Red 265); Molybdatrot (C.I. Pigment Red 104); ultramarine;

Iron oxide brown (C.I. Pigment Brown 6 and 7), mixed brown, spinel and corundum phases (C.I. Pigment Brown 29, 31, 33, 34, 35, 37, 39 and 40), chrome titanium yellow (C.I. Pigment Brown 24), chrome orange, -

Cerium sulfide (C.I. Pigment Orange 75);

Iron oxide yellow (C.I. Pigment Yellow 42); Nickel titanium yellow (C.I. Pigment Yellow 53;

C.I. Pigment Yellow 157, 158, 159, 160, 161,

162, 163, 164 and 189); Chromium titanium yellow;

Spinel phases (C.I. Pigment Yellow 119);

Cadmium sulfide and cadmium zinc sulfide (C.I. Pigment Yellow 37 and 35); chrome yellow

(C.I. Pigment Yellow 34); bismuth vanadate

(C.I. Pigment Yellow 184).

The luster pigments are platelet-shaped pigments with a single phase or a single phase, the play of colors of which is characterized by the interplay of interference, reflection and absorption phenomena. Examples include aluminum flakes and aluminum, iron oxide and mica flakes coated one or more times, in particular coated with metal oxides.

As a rule, the colorant preparations preferably used according to the invention contain 10 to 70% by weight, preferably 10 to 60% by weight, of pigment (A).

Component (B) contains those preferred according to the invention

Colorant preparations at least one dye. Dyes which are soluble in water or in a water-miscible or water-soluble organic solvent are particularly suitable. The dyes (B) used preferably have a color tone which is comparable to that of the pigments (A), since a particularly intensive coloring of the wood-based materials can be achieved in this way. However, there may also be differences in color dyes (B) are used, which allows nuances in the coloration.

Cationic and anionic dyes are particularly suitable, 5 with cationic dyes being preferred.

Suitable cationic dyes (B) come in particular from the di- and triarylmethane, xanthene, azo, cyanine, azacyanine, methine, acridine, safranine, oxazine, indulin, nigrosine and 10 phenazine series, dyes from the azo, triarylmethane and xanthene series are preferred.

The following are examples: C.I. Basic Yellow 1, 2 and 37; C.I. Basic Orange 2; C.I. Basic Red 1 and 108; C.I. 15 Basic Blue 1, 7 and 26; C.I. Basic Violet 1, 3, 4, 10, 11 and 49; C.I. Basic Green 1 and 4; C.I. Basic Brown 1 and 4.

Cationic dyes (B) can also be colorants containing external basic groups. Suitable examples are 20 C.I. Basic Blue 15 and 161.

The corresponding dye bases can also be used as cationic dyes (B) in the presence of solubilizing acidic agents. Examples include: C.I. Solvent yellow 25 34; C.I. Solvent orange 3; C.I. Solvent Red 49; C.I. Solvent

Violet 8 and 9; C.I. Solvent Blue 2 and 4; C.I. Solvent Black 7.

Suitable anionic dyes are, in particular, compounds containing sulfonic acid groups from the azo, anthraquinone, metal complex, triarylmethane, xanthene and stilbene series, dyes from the triaryl methane, azo and metal complex (especially copper) , Chromium and cobalt complex) series are preferred.

35 Specifically, for example: C.I. Acid Yellow 3, 19, 36 and 204; C.I. Acid Orange 7, 8 and 142; C.I. Acid Red 52, 88, 351 and 357; C.I. Acid Violet 17 and 90; C.I. Acid Blue 9, 193 and 199; C.I. Acid Black 194; anionic chromium complex dyes such as C.I. Acid Violet 46, 56, 58 and 65; C.I. Acid Yellow

40 59; C.I. Acid Orange 44, 74 and 92; C.I. Acid Red 195; C.I. Acid Brown 355 and C.I. Acid Black 52; anionic cobalt complex dyes such as C.I. Acid Yellow 119 and 204; C.I. Direct Red 80 and 81.

45 Water-soluble dyes are preferred.

In particular, alkali metal cations such as Li ⁺ , Na ⁺ , K ⁺ , ammonium and substituted ammonium ions, especially alkanolammonium ions, may be mentioned as water-solubilizing cations.

The colorant preparations preferably used according to the invention generally contain the dye (B) in amounts of 0.5 to 10% by weight, preferably 1 to 8% by weight, based in each case on the pigment (A). Based on the total weight of the preparation, this generally corresponds to amounts of 0.05 to 7% by weight, especially 0.1 to 5.6% by weight.

Preferred pigment / dye combinations include: C.I. Pigment Pigment Blue 15: 1 and C.I. Basic Violet 4; C.I. Pigment Green 7 and C.I. Basic Green 4; C.I. Pigment Red 48: 2 and C.I. Direct Red 80; C.I. Pigment Black 7 and C.I. Basic Violet 3.

At least one dispersant is present as component (C) in the colorant preparations preferred according to the invention.

Particularly suitable dispersants (C) are nonionic and anionic surface-active additives and also mixtures of these additives.

Preferred nonionic surface-active additives (C) are based in particular on polyethers.

In addition to the unmixed polyalkylene oxides, preferably CC ₄ alkylene oxides and phenyl-substituted C ₂ -C ₄ alkylene oxides, in particular polyethylene oxides, polypropylene oxides and poly (phenylethylene oxides), block copolymers, in particular polypropylene oxide and polyethylene oxide blocks or poly (phenylethylene oxide) are, in particular, and polymers containing polyethylene oxide blocks, and also random copolymers of these alkylene oxides.

These polyalkylene oxides can be obtained by polyaddition of the alkylene oxides to starter molecules, such as to saturated or unsaturated aliphatic and aromatic alcohols, phenol or naphthol, each by alkyl, in particular C 1 -C ₄ alkyl, preferably C 1 -C 4 or C 1 -C ₄ alkyl, may be substituted, saturated or unsaturated aliphatic and aromatic amines, saturated or unsaturated aliphatic carboxylic acids and carboxamides are prepared. 1 to 300 mol, preferably 3 to 150 mol, of alkylene oxide are usually used per mol of starter molecule. Suitable aliphatic alcohols generally contain 6 to 26 carbon atoms, preferably 8 to 18 carbon atoms, and can be unbranched, branched or cyclic. Examples include octanol, nonanol, decanol, isodecanol, undecanol, dodecanol, 2-butyl octanol, tridecanol, isotridecanol, tetrahedron alcohol, pentadecanol, hexadecanol (cetyl alcohol), 2-hexyl decanol, heptadecanol, octadecanol (stearyl alcohol and 2) - nol, 2-octyldecanol, 2-nonyltridecanol, 2-decyltetradecanol, oleyl alcohol and 9-0ctadecenol as well as mixtures of these alcohols, such as Cs / Cio-, Cχ ₃ / Ci ₅ - and Cι ₆ / Cι ₈ -alcohols, and Cyclopentanol and cyclohexanol called. Of particular interest are the saturated and unsaturated fatty alcohols, which are obtained from natural raw materials through fat splitting and reduction, and the synthetic fatty alcohols from oxo synthesis. The alkylene oxide adducts with these alcohols usually have average molecular weights M _n of 200 to 5000.

Examples of the aromatic alcohols mentioned above include unsubstituted phenol and α- and β-naphthol, hexylphenol, heptylphenol, octylphenol, nonylphenol, isononylphenol, undecylphenol, dodecylphenol, di- and tributylphenol and dinonylphenol.

Suitable aliphatic amines correspond to the aliphatic alcohols listed above. Here too, the saturated and unsaturated fatty amines, which preferably have 14 to 20 carbon atoms, are of particular importance. Aniline and its derivatives may be mentioned as aromatic amines.

Suitable aliphatic carboxylic acids are, in particular, saturated and unsaturated fatty acids, which preferably contain 14 to 20 C atoms, and hydrogenated, partially hydrogenated and unhydrogenated resin acids and also polyvalent carboxylic acids, e.g. Dicarboxylic acids such as maleic acid.

Suitable carboxamides are derived from these carboxylic acids.

In addition to the alkylene oxide adducts to the monohydric amines and alcohols, the alkylene oxide adducts to at least bifunctional amines and alcohols are of particular interest.

Preferred at least bifunctional amines are di- to pentavalent amines, which have in particular the formula HN- (R-NR ¹ ) _I1 -H (R: C ₂ -C ₆ -alkylene; Ri _: hydrogen or Cx-Cβ-alkyl; n: 1 to 5) correspond. Examples include: ethylene diamine, diethylene triamine, triethylene tetra in, tetraethylene pentane amine, propylenediamine-1,3, dipropylenetriane, 3-amino-l-ethyleneaminopropane, hexamethylenediamine, dihexamethylenetriamine, 1,6-bis (3-aminopropylamino) hexane and N-methyldipropylenetriamine, with hexamethylenediamine and diethylenetriamine being particularly preferred 5 and ethylenediamine is especially preferred.

These amines are preferably first reacted with propylene oxide and then with ethylene oxide. The ethylene oxide content of the block copolymers is usually about 10 to 10 90% by weight.

The block copolymers based on polyvalent amines generally have average molecular weights M _n of 1000 to 40,000, preferably 1500 to 30,000.

15

Dihydric to pentavalent alcohols are preferred as at least bifunctional alcohols. For example, C-Cg-alkylene glycols and the corresponding di- and polyalkylene glycols, such as ethylene glycol, 1,2 and -1,3 propylene glycol, 1,2 and 1,4-butylene glycol, hexylene,

20 glycol-1,6, dipropylene glycol and polyethylene glycol, glycerol and pentaerythritol are mentioned, ethylene glycol and polyethylene glycol being particularly preferred and propylene glycol and dipropylene glycol being very particularly preferred.

25 Particularly preferred alkylene oxide adducts with at least bifunctional alcohols have a central polypropylene oxide block, ie they start from a propylene glycol or polypropylene glycol, which is first reacted with further propylene oxide and then with ethylene oxide. The content of block copolymers in ethylene oxide

30 is usually 10 to 90 wt .-%.

The block copolymers based on polyhydric alcohols generally have average molecular weights M _n of 1000 to 20,000, preferably 1000 to 15,000.

35

Such alkylene oxide block copolymers are known and commercially available eg under the name Tetronic ^® and Pluronic ^® (BASF).

Anionic surface-active additives (C) are based in particular on sulfonates, sulfates, phosphonates or phosphates as well as surface-active polymers containing carboxylate groups.

Examples of suitable sulfonates are aromatic sulfonates, such as pC ₈ -C 20 -alkylbenzenesulfonates, di- (C ₁ -C ₈ -alkyl) naphthalenesulfonates 45 and condensation products of naphthalenesulfonic acids with formaldehyde, and aliphatic sulfonates, such as C 1 -C ₈ -alkanesulfonates, α-sulfofatty acid C ₂ -C ₈ alkyl esters, sulfosuccinic acid esters and alkoxy, acyloxy and acylaminoalkanesulfonates.

Aryl sulfonates are preferred, the di- (-C ₈ -alkyl) - naphthalenesulfonates being particularly preferred. Diisobutyl and diisopropylnaphthalenesulfonate are very particularly preferred.

Examples of suitable sulfates are C ₈ -Co-alkyl sulfates.

Another important group of anionic surface-active additives (C) are the sulfonates, sulfates, phosphonates and phosphates of the polyethers mentioned as nonionic additives.

These can be converted into the by reaction with phosphoric acid, phosphorus pentoxide and phosphonic acid or sulfuric acid and sulfonic acid

Phosphoric acid monoesters or diesters and phosphonic acid esters or the

Sulfuric acid monoesters and sulfonic acid esters are transferred.

These acidic esters are like those listed above

Sulfonates and sulfates, preferably in the form of water-soluble salts, in particular as alkali metal salts, especially sodium salts, and

Ammonium salts before, but they can also be in the form of the free

Acids are used.

Preferred phosphates and phosphonates are derived primarily from alkoxylated, in particular ethoxylated, fatty and oxo alcohols, alkylphenols, fatty amines, fatty acids and resin acids, preferred sulfates and sulfonates are based in particular on alkoxylated, especially ethoxylated, fatty alcohols, alkylphenols and amines, too polyvalent amines, such as hexamethylene diamine.

Such anionic surface active additives are known and commercially available for example under the name Nekal ^® (BASF), Tamol ^® (BASF), Crodafos ^® (Croda), Rhodafac ^® (Rhodia), Maphos ^® (BASF), Texapon ^® (Cognis), Empicol ^® (Albright & Wilson), Matexil ^® (ICI), Soprophor ^® (Rhodia) and Lutensit ^® (BASF).

Other suitable anionic surface-active additives (C) are based on water-soluble polymers containing carboxylate groups. By adjusting the ratio between the polar and non-polar groupings contained, these can advantageously be adapted to the particular application and the respective pigment. Monomers which are used to prepare these additives are, in particular, ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated dicarboxylic acids and vinyl derivatives which have no acid function.

Examples of these monomer groups are:

Acrylic acid, methacrylic acid and crotonic acid,

- maleic acid, maleic acid hydride, maleic acid monoester,

Maleic acid monoamides, reaction products of maleic acid with diamines, which can be oxidized to derivatives containing a oxide group, and fumaric acid, maleic acid, maleic anhydride and maleic acid monoamides being preferred;

- vinyl aromatics such as styrene, methylstyrene and vinyltoluene;

Ethylene, propylene, isobutene; Vinyl esters of linear or branched monocarboxylic acids, such as vinyl acetate and vinyl propionate; Alkyl esters and aryl esters of ethylenically unsaturated monocarboxylic acids, in particular acrylic and methacrylic esters, such as methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl, 2-ethylhexyl, nonyl, lauryl and hydroxy ethyl (meth) acrylate and phenyl, naphthyl and • • - benzyl (meth) acrylate; Dialkyl esters of ethylenically unsaturated dicarboxylic acids, such as dimethyl, diethyl, dipropyl, diisopropyl, dibutyl, dipentyl, dihexyl, di-2-ethylhexyl, dinonyl, dilauryl and di-2-hydroxyethyl maleate and - fumarate; vinylpyrrolidone; Acrylonitrile and methacrylonitrile, styrene being preferred.

In addition to homopolymers of these monomers, in particular polyacrylic acids, copolymers of the monomers mentioned are particularly suitable as an additive (C). The copolymers can be statistical copolymers, block copolymers and graft copolymers.

The carboxyl groups of the polymeric additives (C) are preferably at least partially in salt form in order to ensure solubility in water. For example, alkali metal salts, such as sodium and potassium salts, and ammonium salts are suitable.

The polymeric additives (C) usually have average molecular weights M _w of 1000 to 250,000, and the acid number is generally 40 to 800.

Examples of preferred polymeric additives (C) are polyacrylic acids and styrene / acrylic acid, acrylic acid / maleic acid, butadiene / acrylic acid and styrene / maleic acid copolymers, each as additional monomer components acrylic acid esters. and / or maleic acid esters.

Particularly preferred polymeric additives (C) are polyacrylic acids, 5 which generally have an average molecular weight M _w of 1000 to

250,000 and have acid numbers of 200 200, and styrene / acrylic acid copolymers which generally have average molecular weights M _w of 1000 to 50,000 and acid numbers of> 50.

10 Such anionic surface active additives are also known and commercially available for example under the name Sokalan ^® (BASF), juggler cryl (Johnson Polymer), Neoresin (Avecia) and Orotan and Mo rez ^® (Rohm & Haas).

The colorant preparations preferably used according to the invention usually have a content of dispersant (C) of 1 to 50% by weight, in particular 1 to 40% by weight.

Water forms the liquid carrier material of the colorant preparations used according to the invention.

The colorant preparations preferably contain a mixture of water and a water retention agent as the liquid phase. Organic solvents which are difficult to evaporate (i.e. usually one) serve in particular as water retention agents

Have a boiling point> 100 ° C), therefore they retain water and are soluble in water or miscible with water.

Examples of suitable water retention agents are polyhydric alcohols, preferably unbranched and branched polyhydric alcohols having 2 to 8, in particular 3 to 6, carbon atoms, such as ethylene glycol, 1,2- and 1,3-propylene glycol, glycerol, erythritol, pentaerythritol , Pentites such as arabite, adonite and xylitol, and hexites such as sorbitol, mannitol and dulcitol. Also suitable are, for example, di-, 35- and tetraalkylene glycols and their mono- (especially C ₁ -C ₆ -, in particular C ₁ -C ₄ -) alkyl ethers. Examples include di-, tri- and tetraethylene glycol, diethylene glycol monomethyl, ethyl, propyl and butyl ether, triethylene glycol monomethyl, ethyl, propyl and butyl ether, di-, tri- and tetra-1,2- and -1, 3-propylene glycol 40 and di-, tri- and tetra-1,2- and -1, 3-propylene glycol monomethyl, ethyl, propyl and butyl ether.

As a rule, the colorant preparations preferably used according to the invention contain 10 to 88.95% by weight, preferably 10 to 45 80% by weight, of liquid phase (D). If water is present in a mixture with a water-retaining organic solvent, the ses solvent in general 1 to 80 wt .-%, preferably 1 to 60 wt .-%, of phase (D).

The colorant preparations can also contain customary additives, such as biocides, defoamers, anti-settling agents and rheology modifiers, the proportion of which can generally be up to 5% by weight.

The colorant preparations which are preferred according to the invention and contain both pigment and dye can be obtained in various ways. A pigment dispersion is preferably first prepared, to which the dye is then added as a solid or in particular in dissolved form.

Examples

1. Preparation of the colorant preparations

The following colorant preparations were used to color the OSB panels.

1.1. Green pigment preparation

Mixture obtained by wet grinding in a stirred ball mill

40% by weight C.I. Pigment Green 7 8% by weight of a block copolymer based on ethylenediamine / propylene oxide / ethylene oxide with an ethylene oxide content of 40% by weight and an average

Molecular weight M _n of 6500 15 wt .-% dipropylene glycol 37 wt .-% water.

1.2. Red pigment preparation

Mixture obtained by wet grinding in a stirred ball mill

30% by weight of C.I. Pigment Red 48: 2

29% by weight of a 26% by weight ammoniacal solution of an acrylic acid / styrene copolymer with an acid number of 216 mg KOH / g and an average molecular weight M _n of 9,200 1% by weight of dipropylene glycol

40% by weight water. 1.3. Black pigment preparation

Mixture obtained by wet grinding in a stirred ball mill

40% by weight C.I. Pigment Black 7

10% by weight of a block copolymer based on ethylenediamine / propylene oxide / ethylene oxide with an ethylene oxide content of 40% by weight and an average molecular weight M _n of 12,000

22% by weight dipropylene glycol 28% by weight water.

1.4. Blue pigment preparation

Mixture obtained by wet grinding in a stirred ball mill

40% by weight C.I. Pigment Blue 15: 1 8% by weight of a block copolymer based on ethylenediamine /

Propylene oxide / ethylene oxide with an ethylene oxide content of 40% by weight and an average molecular weight M _n of 6700 10% by weight dipropylene glycol 42% by weight water.

1.5. Green colorant preparation

Mixture of 25 wt .-% of the green pigment preparation No. 1.1 and 7 wt .-% of a 47 wt. % solution from C.I. Basic Green 7 in 48 wt% acetic acid and 68 wt% water.

1.6. Red colorant preparation

Mixture obtained by wet grinding in a stirred ball mill

26% by weight of C.I. Pigment Red 48: 2 5% by weight C.I. Direct Red 80

24% by weight of a 26% by weight ammoniacal solution of an acrylic acid / styrene copolymer with an acid number of 216 mg KOH / g and an average molecular weight M _n of 9,200 5% by weight of dipropylene glycol

40% by weight water. 1.7. Black colorant preparation

Mixture of 94% by weight of black pigment preparation No. 1.3 and 6% by weight of a 10% by weight solution of C.I. Basic Violet 3 in 30% by weight acetic acid.

1.8. Blue colorant preparation

Mixture of 90% by weight of the blue pigment preparation No. 1.4 and 10% by weight of a 10% by weight solution of C.I. Basic Violet 4 in 30% by weight acetic acid.

1.9. Violet dye preparation

10% by weight solution of C.I. Basic Violet 4 in 30% by weight acetic acid.

1.10. Green dye preparation

47% by weight solution of C.I. Basic Green 4 in 48 wt% acetic acid.

2. Production of colored OSB boards

The glue batch listed in the following table was used to manufacture the OSB boards:

table

2.1. Production of a green colored OSB board -

Before drying, the strands were colored by spraying with a 0.5% strength by weight dispersion of pigment preparation No. 1.1 in water and dried to 1-2% by weight moisture in drum dryers.

The colored strands were then divided into middle and top layer fractions and glued in separate continuous mixers with the glue batches listed in the table.

The glued strands were poured into mats in the usual way and pressed into plates at 200 ° C.

The OSB board obtained showed a homogeneous, intense green color. The wood structure was visible after sanding.

2.2. Production of a red colored OSB board with an isoeyanate-bound middle layer

Before drying, the strands were colored by dipping with a 0.2% strength by weight dispersion of pigment preparation No. 1.2 in water and dried to 1-2% by weight moisture in drum dryers.

The colored strands were then divided into middle and top layer fractions and glued in separate continuous mixers. The glue formulation mentioned in the table was used for the strands of the top layer. The strands for the middle layer were glued with 4% by weight isocyanate (MDI), which was emulsified in water (weight ratio 1: 1) immediately before the gluing.

The OSB plate obtained showed a homogeneous, intense red color. The wood structure was visible after sanding. 2.3. Production of a black colored OSB board with an isocyanate-bound middle layer

Before drying, the strands were dyed with a 5% by weight dispersion of colorant preparation No. 1.3 in water and then dried to a moisture content of 1-3% by weight.

The colored strands were then divided into middle and top layer fractions and glued in separate continuous mixers. The glue formulation mentioned in the table was used for the strands of the top layer. The strands for the middle layer were glued with 4% by weight of isocyanate (MDI), which was emulsified in water (weight ratio 1: 1) immediately before the gluing.

The OSB board obtained shows a homogeneous, intense, brilliant black color. The wood structure was visible after sanding.

2.4. Production of a blue colored OSB board

Before drying, the strands were dyed with a 0.5% by weight solution of dye preparation No. 1.4 in water and dried in drum dryers to 1-2% by weight moisture.

The colored strands were then divided into middle and top layer fractions and glued in separate continuous mixers with the glue batches mentioned in the table.

The OSB plate obtained showed a homogeneous, intense blue color. The wood structure was visible after sanding. 2.5 Production of a green colored OSB board

Before drying, the strands were dyed with a 0.6% by weight dispersion of pigment preparation No. 1.5 in water and dried to 1-2% by weight in a tumble dryer.

2.6 Production of an OSB board with red colored cover layers and isocyanate-bound middle layer

The dried strands were divided into middle and top layer fractions.

The strands for the top layer were colored by dipping with a 5% strength by weight dispersion of colorant preparation No. 1.6 in water and then glued with the glue batch mentioned in the table for the top layer.

The strands for the middle layer were glued with 4% by weight of isocyanate (MDI), which was emulsified in water (weight ratio 1: 1) immediately before the gluing.

The OSB board obtained shows a homogeneous, intense, brilliant red color on the top layer. The wood structure was visible after sanding. 2.7 Production of a black colored OSB board

Before drying, the strands were dyed with a 3% by weight solution of dye preparation No. 1.7 in water and dried to 1-2% by weight in a tumble dryer.

The OSB plate obtained showed a homogeneous, intense black color. The wood structure was visible after sanding.

2.8 Production of an OSB board with blue colored outer layers and isocyanate-bound middle layer

The dried strands were divided into middle and top layer fractions.

The strands for the top layer were colored by dipping with a 5% strength by weight dispersion of colorant preparation No. 1.8 in water and then glued with the glue batch mentioned in the table for the top layer.

The OSB board obtained shows a homogeneous, intense, brilliant blue color on the top layer. The wood structure was visible after sanding. 2.9 Production of a violet-colored OSB board

Before drying, the strands were colored by spraying with a 0.3% by weight dispersion of pigment preparation No. 1.9 in water and dried to 1-2% by weight moisture in drum dryers.

The OSB plate obtained showed a homogeneous, intense violet color. The wood structure was visible after sanding.

2.10 Production of an OSB board with green colored cover layers and isocyanate-bound middle layer

The dried strands were divided into middle and top layer fractions.

The strands for the top layer were colored by dipping with a 5% by weight dispersion of colorant preparation No. 1.10 in water and then glued with the glue batch mentioned in the table for the top layer.

The OSB board obtained shows a homogeneous, intense, brilliant green color on the top layer. The wood structure was visible after sanding.

Claims

claims

1. A process for the production of colored OSB boards, characterized in that the wooden beach serving as the base material for the OSB boards is brought into contact with a liquid colorant preparation before or after drying, then glued in the usual way, poured into three-layer mats and these are hot-pressed into plates consisting of a middle layer with two cover layers.

2. The method according to claim 1, characterized in that the strands are colored continuously by spraying or dipping into a colorant solution or dispersion.

3. The method according to claim 1 or 2, characterized in that the strands for the cover and / or middle layers of the OSB panels are colored.

4. Process according to claims 1 to 3, characterized in that a pigment preparation, a dye preparation or a preparation containing pigment and dye is used as the colorant preparation.

5. Process according to Claims 1 to 4, characterized in that a colorant preparation which contains at least one pigment and, based on the pigment, 0.5 to 10% by weight of at least one dye is used.

6. Process according to claims 1 to 5, characterized in that one uses a colorant preparation, the

(A) 10 to 70% by weight of at least one pigment,

(B) 0.05 to 7% by weight of at least one dye,

(C) 1 to 50% by weight of at least one dispersant,

(D) 10 to 88.95% by weight of water or a mixture of water and at least one water retention agent and

(E) 0 to 5% by weight of further constituents customary for colorant preparations

contains.

7. The method according to claim 6, characterized in that a colorant preparation is used which ^{• contains} as component (B) at least one anionic or a cationic dye.

8. The method according to claim 6, characterized in that a colorant preparation is used which contains as component (C) at least one nonionic surface-active additive, at least one anionic surface-active additive or a mixture of these surface-active additives.

9. The method according to claim 6, characterized in that one uses a colorant preparation which contains as a water retention agent a difficult to evaporate, water-soluble or water-miscible organic solvent.

10. OSB boards colored with a colorant preparation which contains at least one pigment and, based on the pigment, 0.5 to 10% by weight of at least one dye.