Method for producing wood material panels, in particular OSB wood material panels, and wood material panel that can be produced in accordance with said method

Patent metadata

Field	Value
Publication number	US-10189178-B2
Application number	US-201515526142-A
Country	US
Kind code	B2
Filing date	Mar 9, 2015
Priority date	Nov 13, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A method of producing wood-base panels, especially OSB wood-base panels is provided. The method including the steps of providing wood strands, applying at least one adhesive system to the wood strands having at least one polymer adhesive and at least one nanoparticle below 500 nm, and pressing the wood strands admixed with the adhesive system to form wood-base panels.

First claim

What is claimed is:

1. A method of producing an OSB wood-base panel, comprising the steps of:
a) providing wood strands;
b) applying at least one adhesive system to the wood strands, wherein the adhesive system comprises:
solely a polyurethane adhesive, and
nanoparticles below 500 nm, wherein at least one nanoparticle is modified with at least one compound of general formula (I)
R a SiX (4-a)   (I),

or of general formula (II)
O b X c (OH) d R e SiO (4-b-c-d-e)/2   (II),

where
X is H, OH or a hydrolyzable moiety selected from the group consisting of: halogen, alkoxy, carboxyl, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl,
R is a nonhydrolyzable organic moiety R selected from the group consisting of: substituted and unsubstituted alkyl, substituted and unsubstituted aryl, substituted and unsubstituted alkenyl, substituted and unsubstituted alkynyl, substituted and unsubstituted cycloalkyl, which may each be interrupted by —O— or —NH—, and
wherein R may include at least one functional group Q selected from a group containing an epoxy, hydroxyl, ether, amino, monoalkylamino, dialkylamino, substituted and unsubstituted anilino, amide, carboxyl, acryloyl, acryloyloxy, methacryloyl, methacryloyloxy, mercapto, cyano, alkoxy, isocyano, aldehyde, alkylcarbonyl, acid anhydride and/or phosphoric acid group,
a is =0, 1, 2, 3,
b, c, d are=0 or 1, and
e is =1, 2, 3;

wherein the adhesive system is admixed to the wood strands in an amount between 1.0 and 2.5 wt % based on the wood strands, and
c) pressing the wood strands admixed with the adhesive system to form the wood-base panel.

2. The method as claimed in claim 1 , wherein the wood strands have a length between 50 to 200 mm, a width between 5 to 50 mm, and a thickness between 0.1 and 2 mm.

3. The method as claimed in claim 1 , wherein the polyurethane adhesive is based on polydiphenylmethane diisocyanate (PMDI).

4. The method as claimed in claim 1 , wherein X is selected from a group containing fluorine, chlorine, bromine, iodine, C 1-6 alkoxy, C 6-10 aryloxy, C 2-7 acyloxy, C 2-7 alkylcarbonyl, monoalkylamino or dialkylamino of C 1 to C 12 .

5. The method as claimed in claim 1 , wherein R is selected from a group consisting of: substituted and unsubstituted C 1-30 alkyl, substituted and unsubstituted C 2-6 alkenyl, substituted and unsubstituted C 2-6 alkynyl and substituted and unsubstituted C 6-10 aryl.

6. The method as claimed in claim 1 , wherein R is selected from a group containing methyl, ethyl, n-propyl, isopropyl, n-butyl, s-butyl, t-butyl, pentyl, hexyl, cyclohexyl, vinyl, 1-propenyl, 2-propenyl, butenyl, acetylenyl, propargyl, phenyl and naphthyl.

7. The method as claimed in claim 1 , wherein the at least one functional group Q is selected from a group containing epoxy, hydroxyl, ether, acryloyl, acryloyloxy, methacryloyl, methacryloyloxy, alkoxy, cyano and/or isocyano groups.

8. The method as claimed in claim 1 , wherein the at least one functional group Q is an epoxy group, an amine group or an isocyano group.

9. The method as claimed in claim 1 , wherein the at least one nanoparticle has a size between 2 and 400 nm.

10. The method as claimed in claim 1 , wherein the at least one nanoparticle comprises an oxidic, hydroxidic or oxyhydroxidic nanoparticle.

11. The method as claimed in claim 1 , wherein the modified nanoparticles are used in an amount between 1 to 15 wt % based on the total amount of polyurethane adhesive.

12. The method as claimed in claim 1 , wherein the modified nanoparticles are admixed to the polyurethane adhesive or are applied to the wood strands before resination thereof.

13. An OSB wood-base panel obtained by a method as claimed in claim 1 , comprising an adhesive content between 1.0 and 2.5 wt % based on the total amount of the wood strands.

14. The method of claim 1 , wherein a is =0 or 1.

15. The method of claim 1 , wherein the adhesive system is admixed to the wood strands in an amount between 2.0 and 2.2 wt % based on the wood strands.

16. The method of claim 3 , wherein the polyurethane adhesive based on PMDI is the sole polymer adhesive.

Assignees

• SWISS KRONO Tec AG

Inventors

• Gier Andreas
• Kalwa Norbert
• Mueller Dirk

Classifications

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• B29K2995/0077

  Yield strength; Tensile strength · CPC title

• C09J161/00

  Adhesives based on condensation polymers of aldehydes or ketones (with polyalcohols C09J159/00; with polynitriles C09J177/00); Adhesives based on derivatives of such polymers · CPC title

• C08G18/003

  with epoxy compounds having no active hydrogen (with epoxy resins containing active hydrogen C08G18/58) · CPC title

• C09J5/06

  involving heating of the applied adhesive · CPC title