JP2955992B2 - Building materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to building materials such as plywood and laminated veneer obtained by laminating and bonding a plurality of wooden veneers.

[0002]

2. Description of the Related Art As a building material, plywood and veneer laminates obtained by laminating a plurality of wooden veneers via an adhesive so that their fiber directions are orthogonal or parallel are known. It is. Such a building material is used for building members, fitting members, construction members, and the like, as they are, or by subjecting their surfaces to optional makeup.

[0003] Since building materials are warped or twisted due to expansion and contraction due to absorption and release of moisture, it has been proposed to perform dimensional stabilization treatment such as acetylation treatment, formalization treatment, esterification treatment and the like.

[0004]

However, the dimensional stabilization treatment according to the prior art requires the use of dangerous or expensive chemicals, requires special equipment, and requires a long processing time. However, all of them have low productivity and are not practically satisfactory.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a low-cost building material which is suppressed in moisture absorption expansion and excellent in dimensional stability.

In order to achieve this object, the present invention according to claim 1 provides a building material obtained by laminating and bonding a plurality of wood veneers, wherein at least the wood veneer constituting the outermost layer has a glyoxal resin and It is characterized by being impregnated and fixed with a polyhydric alcohol.

The present invention according to claim 2 is a building material characterized by laminating and bonding a plurality of wooden veneers to which a glyoxal resin and a polyhydric alcohol are impregnated and fixed.

A third aspect of the present invention is the building material according to the first or second aspect, wherein a veneer is used for at least one of the wooden veneers constituting the outermost layer.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The wood veneer used in the building material of the present invention is obtained by cutting a softwood or hardwood raw wood or a flitch obtained by cutting a raw wood into a rotary lace, a half-round rotary lace, a slicer, a veneer saw and the like. Obtained by cutting using an apparatus.

[0010] On the surface of the wooden veneer, cells of wood, cell holes formed of conduit holes or temporary conduit holes are opened, or innumerable fine cracks appear.

After drying the obtained wood veneer to adjust its water content to about 7 to 25%, the glyoxal resin is applied and impregnated, and dried by heating to fix the glyoxal resin in the wood veneer. The coating and impregnation of the wood veneer with the glyoxal resin can be performed by using a dipping device or a coating device such as a roll coater, a flow coater, a curtain coater, or a spray.

The glyoxal resin is an initial condensate composed of urea, glyoxal and formaldehyde, and the compounding molar ratio thereof is preferably from 1: 0.5 to 1: 1 to 3.

The glyoxal resin impregnated in the wooden veneer is insolubilized by a self-polycondensation reaction and is insolubilized by an ether bond with a hydroxyl group such as cellulose in the wooden veneer.

A catalyst can be added to the glyoxal resin as necessary. As the catalyst, a magnesium chloride catalyst, an organic amine salt catalyst, a zinc nitrate catalyst, or the like can be used. Addition of such a catalyst activates the self-polycondensation reaction of the glyoxal resin and promotes insolubilization. For this reason, 0.5 to 23% by weight of the non-volatile component of the glyoxal resin is used. Is preferred. There is no problem if the catalyst is added in an amount of 23% by weight or more, but the effect is not significantly improved, so that the practical meaning is poor.

The glyoxal resin is used by adding a polyhydric alcohol. As the polyhydric alcohols, ethylene glycol, propylene glycol, glycerin, pentaerythritol and the like can be used alone or in any combination. The polyhydric alcohol is in a weight ratio of 80:20 to 6 with respect to the nonvolatile component of the glyoxal resin.
It is preferable to mix in the range of 0:40. By adding polyhydric alcohols, in addition to the glyoxal resin being ether-bonded to hydroxyl groups of cellulose and the like in the wood veneer, the hydroxyl groups of polyhydric alcohols are also ether-bonded, so that the crosslink density is high and condensed. Promotes insolubilization.

When a polyhydric alcohol is added to a glyoxal resin for use, it is preferable that the molecular weights of the glyoxal resin and the polyhydric alcohol are similar. If a polyhydric alcohol having a lower molecular weight or a higher molecular weight than the glyoxal resin is added, the glyoxal resin and the polyhydric alcohol are separated without being uniformly penetrated into the wood veneer, and a sufficient ether bond is formed. Is inhibited,
The effect of insolubilization cannot be obtained as expected.

The building material of the present invention uses a treated veneer impregnated and fixed with the glyoxal resin and the polyhydric alcohol as described above and an untreated veneer not impregnated and fixed with these materials, and at least the building material The outer layer is obtained by arranging a treated veneer and laminating and bonding a plurality of wooden veneers via an adhesive.

Alternatively, a building material of the present invention can be obtained by laminating and bonding a plurality of treated veneers to which glyoxal resin and polyhydric alcohols have been impregnated and fixed via an adhesive.

It is preferable to use a veneer for at least one of the wooden veneers (the veneer treated by impregnation and fixation of a glyoxal resin and a polyhydric alcohol) constituting the outermost layer of the building material.

When laminating the wooden veneers, adjacent wooden veneers may be laminated in a direction in which their fiber directions are orthogonal to each other, or may be laminated with the fiber directions of all the wooden veneers parallel. . Alternatively, it is a building material in which one or a plurality of wooden veneers are arranged so that the fiber directions are orthogonal to each other at an arbitrary position, while many of the wooden veneers constituting the building material are laminated with all fiber directions parallel. Can also.

According to the construction of the building material of the present invention, at least the wood veneer disposed on the outermost layer is impregnated and fixed with the glyoxal resin, and the self-polycondensation reaction of the glyoxal resin and the hydroxyl groups such as cellulose in the wood veneer are performed. Is insolubilized by an ether bond of the polyhydric alcohol, and the glyoxal resin is also ether-bonded to a hydroxyl group in the polyhydric alcohol to form a water-insoluble reactant. Is greatly reduced, the dimensional stability is improved, and the balance between the front and the back is improved, so that occurrence of warpage, twist, and the like is prevented.

In the building material of the present invention obtained as described above, a decorative layer is formed on the front surface or the front and back surfaces as necessary. The decorative layer is formed by subjecting the surface of the building material to a base treatment such as a sealing treatment, a sealer treatment, an undercoating treatment, a sanding treatment, etc., if necessary, and then performing a coloring coating or a pattern printing. Alternatively, after performing the same base treatment as necessary, with or without an adhesive,
Veneer, artificial veneer, veneer or artificial veneer to which a backing material is stuck, or decorative paper, decorative synthetic resin-impregnated paper, even if the decorative layer is formed by pasting a decorative sheet-like material such as a decorative synthetic resin film Good.

[0023]

According to the present invention, in a building material obtained by laminating and bonding a plurality of wood veneers, at least the wood veneer constituting the outermost layer is impregnated and fixed with a glyoxal resin and a polyhydric alcohol. Thus, there is provided a building material in which the hygroscopicity from the front and back surfaces is suppressed low, and therefore the hygroscopic expansion is suppressed, the dimensional stability is excellent, and no warping or twisting occurs.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-29711 (JP, A) JP-A-4-316801 (JP, A) JP-A-9-24506 (JP, A) 39763 (JP, B2) JP-B 46-2437 (JP, B1) JP-B 50-18043 (JP, B1) JP-B 53-27994 (JP, Y2) Utility model registration 2578494 (JP, Y2) (58) ) Surveyed field (Int. Cl. ⁶ , DB name) B27D 1/04 B27K 5/00

Claims (3)

(57) [Claims] 1. A building material obtained by laminating and bonding a plurality of wood veneers, wherein at least the wood veneer constituting the outermost layer is impregnated and fixed with a glyoxal resin and a polyhydric alcohol. Building materials. 2. A building material comprising a plurality of wood veneers impregnated and fixed with a glyoxal resin and polyhydric alcohols, which are laminated and bonded. 3. The building material according to claim 1, wherein a veneer is used as at least one of the wooden veneers constituting the outermost layer.