JPS61102209A - Method of coloring wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention belongs to the field of wood processing technology, and more specifically to the field of wood coloring technology.

[Background Art] Conventionally, methods for coloring wood include methods using synthetic dyes, auxiliary agents (for example, gold salt) for coloring components in wood, or
It can be broadly classified into two types: so-called chemical coloring, which is colored with a combination of natural pigments and chemicals (``Chemistry of Wood Utilization'', published by Kyoritsu Shuppan, author: Tomotaka Yoshimoto et al.).

Among chemical coloring methods, an example of using natural products is a method in which wood is impregnated with an aqueous solution of logwood extract (mainly consisting of tannins) and ferrous sulfate. However, since the composition of natural product extracts is generally not constant, variations are expected depending on the loft. On the other hand, synthetic dyes do not have the above problems because they have a well-defined chemical structure, but they do have problems such as the depth of natural colors and unnatural discoloration. A common disadvantage of all of the above methods is that the coating amount per unit of dyed area is required to be 1 .mu./ci or more.

[Object of the Invention] An object of the present invention is to provide a method of expressing a color tone closer to that of natural wood in the coloring of wood. Specifically, the purpose is to provide a method of expressing the color tone of cedar wood, which is a high-quality material, using dyeing technology.

[Disclosure of the Invention] The present invention provides a method for coloring wood, which is characterized by impregnating bleached wood with at least one norlignan. By converting natural pigment precursors (colorless) into pigments in a manner as close as possible to the process by which wood creates pigment components in nature, we are able to express a color tone that is closer to that of natural wood when coloring wood. It is characterized by the use of norlignans as a precursor of natural pigments.

The norlignans used in this invention include agathare4inol [A] and sugjredinol [B].
, hinokiresinol
[C co), monomethoxyhinokiresinol (monom
ethoxyresinol [D]), hydroxysugiresinol
l[E] ), seguirin-C (seguirin-
Norlignans having two or more phenyl groups such as C[F co) are exemplified. The structural formulas of these are shown below. Note that these substances may be extracted from wood or synthesized.

l-1 [A] [B] [C] [D Although the amount of impregnated conollignans is not intended to be limited, it is 1 to 100.
μg/eta is preferred. When the amount of impregnation is within this range, it is possible to express the appropriate color tone of natural materials (particularly the color of natural cedar wood). In the impregnation, the norlignans are dissolved in a solvent such as alcohols or esters and impregnated into the wood that has been previously subjected to decolorization treatment. After impregnation, if it is necessary to forcibly develop color, the wood impregnated with norlignans is exposed to natural light or air oxidized by heating. In the case of heating, the heating temperature is preferably 0 to 100°C and the heating time is preferably 5 to 24 hours.

By doing the above, it is possible to perform coloring that closely resembles natural wood.

Examples will be explained below.

Example 1 Agatis heartwood was extracted with methanol, and hinokiresinol was isolated from the extract using a silica gel column.

Next, a methanol solution of 0.1% hinokiresinol,
Approximately 2 ml of the solution was sprayed onto the surface of a bleached wood veneer (5 x 5σ), air-dried, and then heated at 50° C. for 5 hours in a thermostat with natural light to develop color. The veneer color was measured using a color difference system.

Example 2 The same procedure as in Example 1 was carried out except that monomethoxyhinokiresinol was used instead of hinokiresinol.

Example 3 The same procedure as in Example 1 was carried out except that the heating conditions were 25° C. for 24 hours.

Table 1 shows the results of the examples described above.

[Margins below] Table 1 [Effects of the Invention] This invention is characterized by impregnating bleached wood with at least one type of norlignan, so it is possible to color the wood in a way that closely matches the color of natural wood. Ta.

Claims (2)

[Claims] (1) A method for coloring wood, which comprises impregnating bleached wood with at least one norlignan. (2) The norlignans include agasaresinol, sugiresinol, hinokiresinol, monomethoxyhinokiresinol, hydroxygiresinol, and seguirin-C
The method for coloring wood according to claim 1, characterized in that the coloring method is one or more selected from the group consisting of: