JPH03110103A - Woody exterior - Google Patents

Abstract

PURPOSE:To improve weather resistance, waterproofing, rot- and insect-proofing, dimensional stability, mechanical strength and flame retardance by using improved wood, the inside of which contains an insoluble incombustible inorganic matter, as wood constituting a section exposed to at least the outer surface of a wood section. CONSTITUTION:Log, lumbered wood, sliced veneer, plywood, etc., are employed as material wood for improvement, and the material wood is not limited particularly. An insoluble incombustible inorganic matter is not limited particularly, but various salt such as a borate, a phosphate, a hydrogenphosphate, a carbonate, a sulfate, a hydrogensulfate, a silicate, a nitrate, a hydroxide, etc., are cited as said inorganic matter. A cation-containing treating liquid and an anion- containing treating liquid are impregnation-permeated separately into wood texture in succession in order to form the insoluble incombustible inorganic matter in wood texture. Said treating liquids are impregnated alternately once or plural times, or they may be impregnated continuously without an alternate method on the plural. Rot- and insect-proofing, dimensional stability, mechanical strength, flame retardance, weather resistance, and waterproofing are improved without damaging woody feeling through the treatment.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to wood exteriors.

[Conventional technology]

In recent years, inorganic exteriors have become mainstream for siding, and metals have become mainstream for gates, fences, posts, decks, etc., but in the past, exteriors were made of wood, and the It is still loved today because of its softness and warmth.

[Problem to be solved by the invention]

However, since the exterior is exposed to the wind and rain outdoors,
Wooden materials have problems in terms of weather resistance, water resistance, antiseptic and insect repellent properties, dimensional stability, mechanical strength, flame retardancy (fire retardancy), etc. For this reason, inorganic and metal exteriors are used, but neither of these has the softness and warmth characteristic of wood exteriors.

In view of the above circumstances, this invention has antiseptic and insect repellent properties, dimensional stability, mechanical strength, flame retardancy (fire retardancy), etc., has excellent weather resistance and water resistance, and has a woody feel. The challenge is to provide an exterior look.

[Means to solve the problem]

As a result of repeated studies to solve the above problems, the inventors discovered the effectiveness of using modified wood containing insoluble and nonflammable inorganic substances, and completed the present invention.

That is, the present invention is characterized in that at least the portion that appears on the outer surface is made of wood, and the wood that constitutes at least the portion that appears on the outer surface of the wood portion is modified wood that contains an insoluble, nonflammable inorganic substance inside. shall be.

The method for producing the modified wood used in the wood exterior according to the present invention is not particularly limited, but it is preferably carried out by the method described below.

The raw material wood for modification is not particularly limited, and examples thereof include raw logs, sawn timber products, sliced veneers, plywood, and the like.

There are no limitations on the tree species, etc.

In addition, the insoluble, nonflammable inorganic substances (insoluble products) that are generated in wood and dispersed and fixed in the wood structure are not particularly limited, but include, for example, borates, phosphates, hydrogen phosphates, carbonates, etc. salts, sulfates, hydrogen sulfates, silicates,
Examples include various salts such as nitrates and hydroxides. Among these salts, specific examples of carbonates include Ba
C0t, Ca COt , Fe COt , M g
CO* , M n COs , N i Cot , Z
n COs etc. Two or more of these may coexist in the wood. The insoluble, nonflammable inorganic substance within the wood may be fixed in the form of a reaction with wood cellulose.

Note that one type of insoluble nonflammable inorganic substance may contain two or more types of each of the cation and/or anion moieties described below.

In order to generate the above-mentioned insoluble non-combustible inorganic substance in the wood tissue, an aqueous solution prepared with a group of inorganic compounds constituting the cationic part of the insoluble non-combustible inorganic substance, that is, a cation-containing treatment liquid, and an anionic part constituting the insoluble non-combustible inorganic substance are used. An aqueous solution prepared with another group of inorganic compounds, that is, an anion-containing treatment solution, is separately and sequentially impregnated into the wood structure. The cation-containing treatment liquid and the anion-containing treatment liquid can be impregnated alternately once or multiple times. When impregnating multiple times, the impregnation may be performed not alternately but continuously.

The cation moiety of the insoluble nonflammable inorganic substance includes, for example, alkali metals such as Na and C;
Alkaline earth metals such as a, Ba, Mg, Sr, Mn,
Transition elements such as Ni and Cd, carbon group elements such as Si and Pb,
Examples include Z n % A 1 and the like. Among these, alkali metals, alkaline earth metals, Zn and Al
is preferred.

The anion portion of the insoluble nonflammable inorganic substance includes, for example, B, Oy, Bos, PO4, C
Examples include O3, S04, NO3, 0HSC1, Br5F, ■, and OH. Among these, BOL,
PO,, COI, SO.

and OH anions are preferred. Furthermore, among the anions, B40t, BOs, and PO4 are as described above ('b).
For CO1, the effect is expected to be due to the mechanism of (d+), and for halogens such as C1, F, and Br, the effect is expected to be due to the mechanism of (C1 and (d)). Note that C1F.

Although Br has an excellent flame retardant effect, it generates a large amount of smoke, so care must be taken when using it.

The above cations and anions are arbitrarily selected depending on the composition of the desired insoluble, nonflammable inorganic substance to be produced in the wood, and by dissolving the water-soluble inorganic substances containing each of these ions in water separately, the desired A cation-containing treatment liquid containing cations and an anion-containing treatment liquid containing desired anions are prepared. However, since not all combinations of cations and anions are possible, it is preferable to select an appropriate combination that can be used, taking into consideration constraints such as the ionic radius.

Examples of inorganic substances that dissolve in water to produce the above-mentioned desired cations include Mg C11x, Mg B r! , MgS
O,-HlolMg (Now)z ・6Ht O,
CaCit SCa B rt , Ca (N'O*
)t, B a Cl・2H, OlB a B I”!
, B a (NOx)t % A11CIl*,
AIB rs , AlzC8O4)* , AI (N
Examples include, but are not limited to, o5es 9 Hz OlZnClg. However, drugs other than halides have low solubility and are difficult to obtain at the required concentration, but halides are preferred because they have high solubility and are easy to obtain at the required concentration. Examples of inorganic substances that dissolve in water to produce the desired anions include N
az COs, (NHa)* Cot, Hz SO
a, Nag-SO4, (NH4)x 304, Hs
PO4, Nag ) (po4, (NHa)i HPO
4, Hs Bow, NaBog, NH, Bow, etc., but the present invention is not limited thereto. Each of the above water-soluble inorganic substances may be used alone, or a plurality of types may be used in combination in one treatment liquid within the range where a uniform aqueous solution can be formed without reacting with each other.

The inorganic substance impregnation treatment of the raw material wood using the above-mentioned cation-containing treatment liquid and anion-containing treatment liquid is performed, for example, as follows.

First, one of the two treatment liquids (the first liquid) is impregnated into the wood by immersing the raw material wood in the same treatment liquid. After impregnating with the first liquid, a treatment liquid (second liquid) containing ions of a partner that reacts with the first liquid is similarly impregnated to generate insoluble and nonflammable inorganic substances inside the wood.

Next, after the two liquids, the anion-containing treatment liquid and the cation-containing treatment liquid, are impregnated as described above, if necessary, a third liquid, a fourth liquid, etc. are prepared and repeated. The product layer may be densified by impregnation.

The cation/anion-containing treatment liquids used at this time may be of the same type or different types, and their concentrations are not particularly limited.

The impregnation treatment method for each liquid, the impregnation treatment time, etc. are not particularly limited, and impregnation can be carried out under reduced pressure or by coating.

In addition, prior to the impregnation treatment with the first liquid, it is recommended that the raw material wood be subjected to a water saturation treatment so that the wood is sufficiently saturated with water. This is because the ions contained in the first liquid can be rapidly diffused using the water in the wood as a medium, and the processing time can be shortened. The water saturation treatment method is not particularly limited, but may be carried out by submerged wood storage, steaming, impregnation under reduced pressure, impregnation under pressure, or the like. In addition, the first
When the liquid is impregnated under reduced pressure, it is not necessarily necessary to carry out this water saturation treatment.

After the impregnation treatment, curing can be performed as necessary to promote the production reaction of insoluble and nonflammable inorganic substances.

After the insoluble, nonflammable inorganic substance is generated and fixed in the wood by the above impregnation treatment, the surface of the wood is washed with water, if necessary, and dried to obtain a modified wood.

The ratio between the amount of bath used for the water saturation treatment, impregnation treatment, etc. and the amount of wood is not particularly limited, but for example, the amount of bath is about 10 times the weight of the untreated wood.

Through each of the above treatments, it is possible to efficiently obtain modified wood that is highly superior in antiseptic and insect repellent properties, dimensional stability, etc., and has flame retardancy. Since the obtained modified wood has inorganic substances impregnated and fixed inside the wood, the wood texture is not impaired, and the wood has excellent appearance as well as the above-mentioned performance.

By using the thus-obtained modified wood containing an insoluble non-combustible inorganic material in part or in whole, it is possible to improve the antiseptic and insect repellent properties, dimensional stability, mechanical strength, and flame retardancy ( It is possible to obtain a wood exterior with excellent weather resistance and water resistance.

In the wooden exterior according to the present invention, it is not necessary that all of the material is wood, and in order to create a woody feel, at least the portion that appears on the outside surface may be wood, and the species of the wood is not limited at all. In addition, it is not necessary that all of the wood parts be modified wood that contains insoluble and nonflammable inorganic substances inside, and in order to impart the above characteristics to the wood exterior, at least the wood that makes up the part that appears on the outside has insoluble and nonflammable inorganic substances inside. Modified wood containing inorganic substances is sufficient.

[For production]

The modified wood containing an insoluble, non-combustible inorganic substance inside, which is used in the wood exterior according to the present invention, is one in which the voids such as conduits inside the wood, the internal cavity, the wood cell walls, etc. are filled with insoluble, non-combustible, hard inorganic substances. Therefore, it has the following characteristics. First, water resistance is improved because voids are eliminated and water penetration into the wood is prevented.

Second, the interior of the wood cell walls is occupied by the filler, producing a bulk effect, which makes it difficult for the wood itself to expand or contract. As a result, dimensional stability is improved and various mechanical strengths are also excellent.

Thirdly, the wood cells are reinforced, which increases the surface hardness, among other things.

Fourth, this insoluble, non-combustible inorganic material that fills the internal cavity of the wood does not provide nutrients for fungi and living things, so it prevents fungi and insects from entering the wood, and it has antiseptic and insect repellent properties. improve.

Furthermore, in addition to the fact that the wood is composited with nonflammable inorganic substances (inorganic coating), depending on the type of inorganic substance, it can also have the effect of improving flame retardancy, making the wood highly flame retardant. become.

Here, once the insoluble and nonflammable inorganic substances are fixed in the wood structure, there is little possibility that they will be dissolved out of the wood thereafter, so there is little worry that their effects will be diminished.

Moreover, since this modified wood contains inorganic substances only inside it, the woody appearance is not impaired.

In the wooden exterior according to the present invention, at least the portion that appears on the outside is made of wood, and the wood that constitutes at least the portion that appears on the outside of the wood portion is modified wood that has the above characteristics. Therefore, the wooden exterior according to this invention has antiseptic and insect repellent properties, dimensional stability,
It has mechanical strength, flame retardancy, etc., excellent weather resistance and water resistance, and has a rich wood texture.

〔Example〕

Specific examples and comparative examples of the present invention are shown below, but the present invention is not limited to the following examples.

First, a rotary veneer made of agathis material with a thickness of 3n was saturated with water at 80°C. Next, B a Cl z and H2SO4
2 moles/I! an aqueous solution at 80°C containing
), containing 4 mol/l of HPO4 and Hg BO, 8
After immersing the veneer saturated with water in an aqueous solution at 0°C for 4 hours each, the veneer is washed in running water for 24 hours and dried to remove the veneer containing insoluble nonflammable inorganic substances inside. Obtained. After that, as shown in Figure 2, the obtained veneer 1
Laminated with water-resistant adhesive 2 (resorcinol type),
9-ply plywood 3 as shown in figure + a) and figure (b)
15-ply parallel plywood (rLVL) as seen in
) 4 was produced.

The following examples were carried out using the 9-ply plywood 3 and the 15-ply LVL4 thus obtained.

Example 1 - By performing a prescribed processing on the 9-ply plywood 3, the first
I obtained a gate A as shown in the figure.

-Example 2- A fence B as shown in Fig. 3 was created by performing prescribed processing on 9-ply plywood 3 and 15-ply LVL4.
I got it.

Example 3 - A 5CI11 square timber was subjected to the same treatment as the veneer described above to obtain a square timber 5 containing an insoluble, non-combustible inorganic substance inside. By subjecting the square timber 5 and the nine-ply plywood 3 to predetermined processing, a deck C as shown in FIG. 4 was obtained.

Example 4 - Siding D as shown in FIG. 5 was obtained by subjecting a 9-ply plywood 3 and a 15-ply LVL 4 to predetermined processing.

Example 5 - By performing a prescribed process on the 9-ply plywood 3, the sixth
I obtained Bost E as shown in the figure.

- Comparative Example 1 - The procedure was the same as in Example 1, except that instead of the modified wood containing insoluble, nonflammable inorganic substances, untreated wood containing no inorganic substances was used. I made a gate.

Examples 1 to 5 and Comparative Example 1 obtained as above
A termite resistance test was conducted on the wooden exterior of . As a result, 3
The insect mortality rate after a week was 100% for the wooden exteriors of Examples 1 to 5, and 5% for the wooden exterior of Comparative Example 1.

Note that in the above embodiments, wood is mainly used as the member, but in this invention, only the portion that appears on the outside surface may be made of wood, and the other portions may be made of a material other than wood. do not have. In addition, in the above embodiments, plywood and LVL are used as the wood members, all of which are made of veneers containing insoluble and nonflammable inorganic substances, but in this invention, only the veneers that appear on the outside are inside. Plywood or LV made of untreated veneer that contains an insoluble noncombustible inorganic substance inside, and other parts do not contain an insoluble noncombustible inorganic substance inside.
It is possible to use L as a wood member.

〔Effect of the invention〕

The wooden exterior according to the present invention has a rich wood feel because at least the part that appears on the outside is made of wood, and the wood that makes up at least the part that appears on the outside has weather resistance, water resistance, antiseptic properties, and Because it is a modified wood with excellent insect repellency, dimensional stability, mechanical strength, and flame retardancy (fire retardant), it does not rot, mold, termite damage, dimensional change, or curl, and is difficult to burn. It is safe and can maintain a good wood texture over a long period of time.

[Brief explanation of drawings]

Fig. 1 is an external view of a gate according to Example 1 of the wooden exterior according to the present invention, and Fig. 2 (a) shows the laminated specifications of a 9-ply plywood made of a veneer containing an insoluble, non-combustible inorganic substance inside. A cross-sectional view, FIG. 2(b) is a cross-sectional view showing the lamination specifications of a 15-ply LVL made of a veneer containing an insoluble and non-combustible inorganic substance, and FIG. 3 is an external view of the fence of Example 2. 4 is an external view of the deck of Example 3, FIG. 5 is an external view of the siding of Example 4, and FIG. 6 is an external view of the post of Example 5.

Claims (1)

[Scope of Claims] 1. An exterior in which at least a portion that appears on the outside surface is made of wood, and that the wood that constitutes at least the portion that appears on the outside surface of the wood portion is modified wood that contains an insoluble and noncombustible inorganic substance inside. Characteristic wood exterior. 2 Modified wood containing an insoluble non-combustible inorganic substance inside is impregnated with one of a cation-containing treatment liquid and an anion-containing treatment liquid that produce the same insoluble non-combustible inorganic substance by mixing, and then impregnating the other. The wood exterior according to claim 1, which is obtained by fixing an insoluble, nonflammable inorganic substance inside the raw material wood.