METHOD FOR PRODUCING SINGLE- OR MULTI-LAYER LIGNOCELLULOSE MATERIALS USING TRIALKYL PHOSPHATE

Abstract

The present invention relates to a process for the discontinuous or continuous, preferably continuous, production of single-layer or multilayer lignocellulosic materials, comprising the process steps of v) mixing the components of the individual layers, x) scattering the mixture(s) produced in process step i) to form a mat, xi) precompacting the scattered mat, and xii) hot pressing the precompacted mat, which comprises, in process step i)
for the core of multilayer lignocellulosic materials or for single-layer lignocellulosic materials, mixing the lignocellulose particles (component LCP-1) with u) 0 to 25 wt % of expanded polymer particles having a bulk density in the range from 10 to 150 kg/m.sup.3 (component A), v) 0.05 to 1.39 wt % of binders selected from the group of organic isocyanates having at least two isocyanate groups (component B), w) 3 to 20 wt % of binders selected from the group of amino resins (component C), x) 0 to 5 wt % of curing agents (component D), y) 0 to 5 wt % of additives (component E), z) 0.01 to 10 wt % of trialkyl phosphate (TAP) (component F), and
for the outer layers of multilayer lignocellulosic materials, mixing the lignocellulose particles (component LCP-2) with aa) 1 to 30 wt % of binders selected from the group of amino resins, phenolic resins, organic isocyanates having at least two isocyanate groups, protein-based binders, and other polymer-based binders (component G), bb) 0 to 5 wt % of curing agents (component H), cc) 0 to 5 wt % of additives (component I), and dd) 0 to 10 wt % of trialkyl phosphate (TAP) (component J).

Claims

1-14. (canceled)

15. A process for the discontinuous or continuous, preferably continuous, production of single-layer or multilayer lignocellulosic materials, comprising the process steps of i) mixing the components of the individual layers, ii) scattering the mixture(s) produced in process step i) to form a mat, iii) precompacting the scattered mat, and iv) hot pressing the precompacted mat, which comprises, in process step i) for the core of multilayer lignocellulosic materials or for single-layer lignocellulosic materials, mixing the lignocellulose particles (component LCP-1) with a) 0 to 25 wt % of expanded polymer particles having a bulk density in the range from 10 to 150 kg/m.sup.3 (component A), b) 0.05 to 1.39 wt % of binders selected from the group of organic isocyanates having at least two isocyanate groups (component B), c) 3 to 20 wt % of binders selected from the group of amino resins (component C), d) 0 to 5 wt % of curing agents (component D), e) 0 to 5 wt % of additives (component E), f) 0.01 to 10 wt % of trialkyl phosphate (TAP) (component F), and for the outer layers of multilayer lignocellulosic materials, mixing the lignocellulose particles (component LCP-2) with g) 1 to 30 wt % of binders selected from the group of amino resins, phenolic resins, organic isocyanates having at least two isocyanate groups, protein-based binders, and other polymer-based binders (component G), h) 0 to 5 wt % of curing agents (component H), i) 0 to 5 wt % of additives (component: I), and j) 0 to 10 wt % of trialkyl phosphate (TAP) (component J).

16. The process for producing single-layer or multilayer lignocellulosic materials according to claim 15, wherein the process is carried out continuously.

17. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein the lignocellulosic materials comprise, in the core or in the sole layer, respectively, 0.5 to 7.5 wt % of component F) or mixtures thereof.

18. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein component F) used comprises trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, or mixtures thereof.

19. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein component F) used comprises triethyl phosphate.

20. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein for the sole layer or the layer of the core, respectively, in process step i) component C) is mixed with component F) or with component D) and with components F), or with component D), with component E) and/or with a portion of component E) and of components F), in a separate step, before it is contacted with LCP-1) or with a mixture of LCP-1) with other components.

21. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein for the sole layer or the layer of the core., in process step i) component C) is mixed with a portion of component F) or with component D) and with a portion of components F), or with component D), with component E) and/or with a portion of component E) and a portion of components F), and component B) is mixed with a portion of component F) or with component E) and/or with a portion of component E) and a portion of components F), in separate steps, before they are contacted with LCP-1) or with a mixture of LCP-1) with other components.

22. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein component B), which has optionally been mixed in a separate step with one or more components selected from the groups of components D), E), and F), and component C), which has optionally been mixed in a separate step with one or more components selected from the groups of components D), E), and F), are added in process step i), either simultaneously or in succession, preferably simultaneously, to the lignocellulose particles LCP-1) or to the mixture of lignocellulose particles LCP-1) with other components.

23. The process for producing multilayer or single-layer lignocellulosic materials according to claim 15, wherein the lignocellulosic materials possess a density of 100 to 700 kg/m.sup.3, preferably 150 to 490 kg/m.sup.3, more preferably 200 to 440 kg/m.sup.3, more particularly 250 to 390 kg/m.sup.3.

24. A single-layer or multilayer lignocellulosic material having a core and optionally at least one upper outer layer and one lower outer layer, produced according to claim 15, in which the scattered layers comprise, for the core of multilayer lignocellulosic materials or in single-layer lignocellulosic materials, lignocellulose particles (component LCP-1) mixed with a) 0 to 25 wt % of expanded polymer particles having a bulk density in the range from 10 to 150 kg/m.sup.3 (component A), b) 0.05 to 1.39 wt % of binders selected from the group of organic isocyanates having at least two isocyanate groups (component B), c) 3 to 20 wt % of binders selected from the group of amino resins (component C), d) 0 to 5 wt % of curing agents (component D), e) 0 to 5 wt % of additives (component E), and f) 0.01 to 10 wt % of trialkyl phosphate (TAP) or mixtures thereof (component F), and for the outer layers of multilayer lignocellulosic materials, lignocellulose particles (component LCP-2) mixed with g) 1 to 30 wt % of binders selected from the group of amino resins, phenolic resins, organic isocyanates having at least two isocyanate groups, protein-based binders, and other polymer-based binders (component G), h) 0 to 5 wt % of curing agents (component H), i) 0 to 5 wt % of additives (component: I), and j) 0 to 10 wt % of trialkyl phosphate (TAP) (component J).

25. The single-layer or multilayer lignocellulosic material according to claim 24, the core or the single layer of the lignocellulosic material comprising 0.5 to 7.5 wt % of component F) or mixtures thereof.

26. A single-layer or multilayer lignocellulosic material obtainable by the process according to claim 15.

27. The use of the single-layer or multilayer lignocellulosic material according to claim 15 in construction, in fitting-out of interiors, in shop fitting and the construction of exhibition stands, as material for furniture, or as packaging material.

28. The use of the single-layer and multilayer lignocellulosic material according to claim 15 as roof paneling and wall paneling, infill, shuttering, floors, internal layers for doors, partitions, shelving, or as support material for unit furniture, as shelving, as door material, as worktop, as kitchen front, as outer layers in sandwich structures, as elements in tables, chairs, and upholstered furniture.

Description

EXAMPLES

[0224] Production of the Boards

[0225] Glue used was a urea-formaldehyde glue (Kaurit Leim 337 from BASF SE). The solids content was adjusted with water to 64.2 wt %. Lupranat M 20 FB from BASF SE was used as pMDI component.

[0226] Production of Chip Material for the Inventive Particle Board (Resination)

[0227] In a mixer, 5.4 kg of spruce chips (middle-layer chips) were mixed with 1 kg of a mixture of 100 parts by weight of Kaurit Leim 337, 4 parts by weight of a 52% strength aqueous ammonium nitrate solution, and 15 parts of water. Then 21.6 g of a mixture of 3 parts by weight of pMDI and one part by weight of triethyl phosphate were applied in the mixer.

[0228] Pressing of the Chip Material

[0229] 950 g of resinated chips, either immediately or after a waiting time of 15 minutes, were scattered into a mold measuring 3030 cm, and subjected to cold precompaction. Thereafter the resulting precompacted chip mat was pressed to particle board in a hot press, to a thickness of 16 mm (pressing temperature 210 C., pressing time 100 s).

[0230] Investigation of the Particle Board

[0231] The transverse tensile strength was determined according to EN 319.

[0232] The thickness swelling after 24 hours was determined according to EN 317.

[0233] The perforator value as a measure of formaldehyde emission was determined according to EN 120.

[0234] The results of the tests are compiled in the table.

[0235] The quantity figures are based always on 100 wt % dry weight of woodchips. The density of the two boards was 550 kg/m.sup.3.

TABLE-US-00001 Kaurit Leim 337 Lupranat M 20 FB TEP Waiting [% based on [% based on [% based on time Test atro wood] atro wood] atro wood] [min] 1 10 0.3 0.1 0 2 10 0.3 0.1 15

TABLE-US-00002 Transverse Thickness swelling Perforator value tensile strength after 24 h according to EN120 Test [N/mm.sup.2] [%] [mg/100 g] 1 0.60 20.6 6.8 2 0.58 21.5 7.7