Hybrid adhesive and the use thereof in engineered wood boards

An adhesive, hybrid technology, used in the field of manufacturing wood panels, can solve the problems of incompatibility, poor process performance, etc., to achieve the effect of improved ecology and compatibility, improved requirements, excellent workability and adhesion

Active Publication Date: 2013-07-17
KRONOTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It is known that using polycondensation and polyaddition adhesives together creates incompatibilities between the two adhesive systems which lead to poorer process properties

Method used

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  • Hybrid adhesive and the use thereof in engineered wood boards

Examples

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Effect test

example 1

[0083] Example 1: Manufacture of the first hybrid adhesive

[0084] Provides a urethane matrix in which OH groups or unincorporated cyanamide groups are also present. SiO 2 The granules are mixed into the urethane matrix in the desired amount. Subsequently, isocyanopropyltriethoxysilane and the possible initiator dibutylisotin dilaurate are added for the case where the polyurethane does not yet contain an initiator. The mixture was heated to 50°C and maintained at this temperature for about 30 minutes. After cooling to room temperature, glycidoxypropyltriethoxysilane and an acid such as phosphoric acid as catalyst are added and stirring is continued for 60 minutes. Subsequently, the polyurethane-silane-SiO thus prepared 2 The mixture is mixed with melamine resin.

example 2

[0085] Example 2: Manufacture of a Second Hybrid Adhesive

[0086] An ethanol / water mixture was provided to which was added a mixture of glycidoxypropyltriethoxysilane and ethyl orthosilicate. Subsequently, the aqueous silica sol solvent, that is to say nano-scale SiO 2 The particles are added to water, and an acid such as acetic acid or p-toluenesulfonic acid is added as a catalyst. After 5 minutes of stirring time, the melamine resin mixture was added and after an additional 20 minutes of stirring time, the polyurethane adhesive was added.

example 3

[0087] Example 3: Particle Board Manufacturing

[0088] Chip shape and chip size have a decisive influence on the quality of the chipboard. The middle layer is made of larger wood chips that give the board stability, the covering layer (outer layer) should be made of smaller wood chips in order to get a flat and regular surface. Depending on the raw material the shape and size of the chips can be influenced for better or for worse. Therefore, in order to manufacture a product of good quality, modern chipboard processes always use a certain proportion of fine-grained wood chips for a flat, uniform covering layer, and a major proportion of stable wood chips under the covering board. , layered structures, chipped new and old wood with chips of different lengths (new logs or sawn waste, e.g. bark, firewood, old wood).

[0089] The lumberyard is the entry point for raw materials. In this case, the different types of wood (quality of wood, storage capacity, quantity determinati...

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Abstract

The present invention relates to a hybrid adhesive, in particular for use in the production of engineered wood such as particle boards, fiber boards, plywood or glued-laminated timber, comprising at least one polycondensation adhesive, at least one polyaddition adhesive, and at least one particle, in particular a nanoparticle smaller than 500 nm, wherein the at least one particle is modified with at least one compound of the general formula (I) RaSiX(4-a) (I), or the general formula (II) ObXc(OH)dReSiO(4-b-c-d-e)/2 (II), where - X is H, OH or a hydrolyzable group selected from the group consisting of halogen, alkoxy, carboxy, amino, monoalkylamino or dialkylamino, aryloxy, acyloxy, alkylcarbonyl, - R is a non-hydrolyzable organic group R selected from the group consisting of substituted and non-substituted alkyl, substituted and non-substituted aryl, substituted and non-substituted alkenyl, substituted and non-substituted alkinyl, substituted and non-substituted cycloalkyl, which can be interrupted by -O- or -NH-, and where R comprises at least one functional group Q selected from a group consisting of an epoxy, hydroxy, ether, amino, monoalkylamino, dialkylamino, substituted and non-substituted anilino, amide, carboxy, alkinyl, acryl, acryloxy, methacryl, methacryloxy, mercapto, cyano, alkoxy, isocyanato, aldehyde, alkylcarbonyl, acid anhydride and/or phosphoric acid group, - R and X can be identical or different from each other, and - a = 1, 2, 3, in particular 1, - b, c, d = 0 or 1, and - e = 1, 2, 3. The present invention also relates to the use of the adhesive in engineered wood boards and to methods for the production thereof.

Description

technical field [0001] The invention relates to an adhesive according to the preamble of claim 1, the use of the adhesive according to claim 10, a method for producing the adhesive according to claims 11 and 12, a method according to claim 1 A wood panel as claimed in claim 13 and a method for manufacturing a wood panel as claimed in claim 14 . Background technique [0002] Adhesives are an important ingredient in the industrial production of a variety of products and in other wood manufactures. Adhesives can be classified according to different criteria based on the chemical basis of the adhesive or its curing mechanism. In total, three superordinate classes of adhesives are defined based on how the adhesive is manufactured: polymeric adhesives, polyaddition adhesives, and polycondensation adhesives. It is also possible to subdivide the adhesives according to their physical and / or chemical properties, for example as hot melt adhesives or solvent adhesives. [0003] Polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/00C09J161/28C09J175/00
CPCC08K2201/005C08G18/837C09J175/04C09J161/00C08K3/36C09J183/08C08K3/22C08K3/2279C09J161/28C09J183/06C09J183/04C08G18/003B29D7/01C08G18/718C09J179/04C08K9/06C09J163/00C09J177/00C09J177/06C09J167/00C09J167/02
Inventor 罗杰·布劳恩安德里亚斯·吉耶约阿希姆·哈施
Owner KRONOTEC
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