JPS5839405A - Non-tenebrescent 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 The present invention relates to non-fading wood obtained by acetylating the surface of wood and then immersing it in a solution of f-lyethylene glycol or its vinyl derivative.

Therefore, the present invention provides the following treatment to wood,
Not only does it provide light resistance to the surface of the main office, but it also becomes brighter when exposed to sunlight.1. It is characterized by the effect of increasing brightness and reducing redness, that is, imparting non-fading properties.

Recently, various wood treatment methods have been developed to impart light resistance to wood, but most of these methods focus on reducing the degree of discoloration that occurs when wood is exposed to sunlight. That is, these studies are concerned with how to prevent discoloration and make it difficult to burn, that is, how to positively prevent discoloration.

However, the cause of discoloration and fading of wood is that the chromophores and chromophores in the wood composition are intertwined in a complex manner, resulting in discoloration and fading, so it is possible to suppress all of these causes of discoloration with just one treatment method. It was found that it is difficult to

Therefore, the present invention was achieved through research into the synergistic effect of combining various methods. That is, in the present invention, by exposure to sunlight and ultraviolet rays,
As the brightness increases, the color tone becomes more vivid, and it is possible to impart negative discoloration, that is, non-fading property, to the wood by decreasing the redness and increasing the yellowness.

Since the color difference on the surface of wood is generally expressed as the absolute value of IB in color science, the negative discoloration obtained in the present invention can also be considered as positive discoloration when expressed as the absolute value of 4B. Although it appears unchanged, it produces a negative discoloration that is fundamentally different from the positive discoloration caused by conventional wood surface treatments.

As mentioned above, the treatment used in the present invention consists of acetylating the wood surface and then impregnating it with polyethylene glycol or its vinyl derivative.

Many acetylation methods are known, and the present inventors may use any acetylating agent, such as acetic anhydride, acetyl chloride, etc., and deoxidizing agents such as amines, etc.
For example, 1:1 to 5 with pyridine, sodium hydroxide, etc.
Excellent results are obtained using a mixture of 1:1 at temperatures below room temperature and 60°C.

In the acetylation process of the present invention, the mixing ratio of the acetylating agent and the deoxidizing agent is not a significant variable for negative discoloration, but the higher the processing temperature, the better the results. . However, the higher the temperature, the greater the off-odor emitted by the treatment solution, so acetylation treatment is usually carried out at a temperature of up to 60°C, although good results may be obtained at temperatures around 100°C or higher in some cases. The treatment time may be in the range of 8 to 24 hours at a temperature from room temperature to 60°C, but if the treatment time is longer, the acetylation of Honno will be improved and good results will be obtained, but within the scope of the present invention, the above-mentioned Favorable results have been obtained in terms of processing time. After acetylation, the wood is thoroughly washed with water, air-dried, and then oven-dried at about 60° C. for 1 hour to eliminate the residual pyridine odor.

After acetylation, the wood is treated by immersion in an aqueous or organic solvent solution of about 10 to 15% by weight of polyalkylene glycol or its vinyl derivative, such as polyethylene glycol methacrylate, for 8 hours at a temperature of about 50 to 60°C. A more favorable result can be obtained. When an organic solution is used, ethyl acetate, xylene, etc. are used as the organic solvent, and the immersion time can be shortened from 1 to 2 hours to several hours. After treatment, the product can be obtained by air drying or oven drying.

In the above-mentioned case, when polyethylene glycol V-neal m is used, a small amount of ammonium persulfate or potassium persulfate or a commonly used peroxide catalyst such as benzoyl peroxide r is mixed as a polymerization catalyst to form a polyethylene glycol neal derivative. It is also preferable to carry out impregnation polymerization.
``In the above treatment, if the wood is thick, the treatment time may be increased, but in the case of thick wood, only the surface layer of the wood is affected by sunlight. It is sufficient that this part is acetylated and further treated with I remer, and there is no need to treat the central part.

It was found that the colors were brighter and more vivid in brightness, saturation and tone.

If the non-fading wood obtained by the present invention is used as a decorative veneer for a core material such as laminated wood and used as an interior material for white water, it will not only maintain its plain wood condition for a long time, but also be used as a clear lacquer. Even if a transparent film is formed on its surface, the base wood decorative veneer can maintain its plain wood state for a long time, so the non-fading wood of the present application is suitable for architectural interiors, for Japanese people who love plain wood. It can be used for a wide range of purposes such as fittings and furniture materials.

The following examples show results obtained using North American coniferous species, particularly Peitzka (Western Fist Hemlock) wood, which is naturally prone to tanning.

Example - The mixing ratio of acetic anhydride and g IJ gin was set to 5:1, and the hemlock wood was immersed in the liquid heated to 60°C for 24 hours to perform acetylation, and after washing thoroughly with water, Air dry and oven dry. Next, a polyethylene glycol aqueous solution having a concentration of 10% was heated to 60°C, and the wood was immersed again for 8 hours, and then air-dried and oven-dried to obtain treated samples. JI this sample
1 with an ultraviolet irradiator that passes the regulations of 8-5400
After irradiation for 00 hours, each numerical value is determined by colorimetry. The results obtained are shown in Figures 1-4 and 11I.

FIG. 1 shows the change in brightness over time during ultraviolet irradiation; the brightness increases as soon as the irradiation begins, and does not decrease even after 100 hours.

Figure 2 shows the time course of the whiteness reduction rate during ultraviolet irradiation, and the whiteness reduction rate progresses negatively at the same time as the irradiation starts.
In other words, the color progresses in the direction of becoming white. Whiteness stops increasing around 75 hours, but remains on the negative side even at 100 hours.

Figure 143 shows the time course of the color difference 4B during ultraviolet irradiation, and the color difference continues to rise as soon as the irradiation starts. Although it may appear as if the color difference is large, it is simply a change in color and is expressed as a color difference that has not progressed toward fading.

Table 1 shows the tristimulus values M, Y, and 2 of the untreated #A, treated material B before irradiation, and treated material that can be irradiated for 100 hours. From this, the color difference ΔB*5, lightness difference, L1, saturation difference, C*, and hue difference, H, for person C and for C and B are determined and displayed. Although C does discolor from the wood surface, it is a negative discoloration, indicating that it is non-fading.

FIG. 4 shows the time course of redness a and yellowness during ultraviolet irradiation, with the redness gradually disappearing and the yellowness gradually increasing.

[Brief explanation of the drawing]

Figure 1 shows the time course of brightness under UV irradiation for sapwood and heartwood, fJc2 diagram (change over time of the whitening reduction rate under UV irradiation for sapwood and heartwood, and Figure 3 shows the change in brightness over time for sapwood and heartwood under UV irradiation. Fig. 4 is a graphic diagram showing the time course of the color difference ΔE when the sapwood and heartwood are irradiated with ultraviolet light. Figure 1 Attorney Patent Attorney Ki Fufuko Proceedings Amendment Written November 4, 1972 Director General of the Patent Office Shima 1) Haruki Tono1, Display of the case 1982 Patent 1g$181380662, Name of the invention Non-fading wood 3. Relationship with the case of the person making the amendment Patent applicant name: Naoyuki Monma Masanobu Yoshimura 4, agent 112° Address 2-1-2 Koishikawa, Bunkyo-ku, Tokyo Contents of the amendment (1) Details The following errors in the text have been corrected as follows. Page Line Current Correction 3 5
Polyethylene Polyalkylene 4 7 1
Time later: Approximately 1 hour Procedural amendment February 4, 1980 Haruki Shimada, Director General of the Hibi Agency t Case indication 1982 Patent resin j [138066 No. 2 Title of invention Non-fading wood & Related Name of special fraud applicant (1) Masanobu Monma (2) Naoyuki Yoshiso 4, Agent 112 Address 2-1-2 Koishikawa, Bunkyo-ku, Tokyo Contents of amendment (1: Specification [8 ) Delete the descriptions in lines 4 to 12. (2) Insert description F at the bottom of Table 1, which is bound next to page 8 of the v1 detailed collection. 4. Brief explanation of the drawings Figure 1 shows the time course of brightness [L] during irradiation of sapwood and heartwood outside the building; Fig. 3 shows the time course of the color difference ΔE in UV irradiation of sapwood and heartwood, and Iris 4Kl shows the redness a and yellowness of sapwood and heartwood in UV 11J111 irradiation. This is a graph showing the temporal change in

Claims (1)

[Claims] (1) The wood is immersed in an acetylation solution to acetylate the wood, then dried, and then dipped in a solution of polyalkylene glycol or its vinyl derivative, impregnated, and dried. Non-fading wood @