JP2006297862A - Wood modifier, its manufacturing method and glass-impregnated wood using wood modifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood modifier which is used for impregnating a wood with a glass component and thereby, enhancing the flame retardant properties and hardness of the wood, imparting rotting-inhibitive and antiformic characteristics, and making the surface hydrophobic and glossy. <P>SOLUTION: The wood modifier is composed of a silicate of soda solution generated by dissolving in a silicate of soda, an aqueous solution of a mixture of a wood extract containing a tropolone/a boric acid, which is obtained by dissolving the boric acid in the wood extract containing tropolones, and heating the dissolution liquid. Further, the wood modifier is applied to the surface of the wood or the wood is impregnated with the wood modifier by a subatmospheric pressure/pressurizing process. Finally, the wood modifier is cured at a prescribed temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wood modifier, a method for producing the same, and a glass-impregnated wood using the wood modifier. More specifically, in order to improve flame retardancy and mechanical strength of wood, it is derived from sodium silicate, boric acid and natural substances. The present invention relates to a thermosetting wood modifier that is produced from tropolones of the above and is cured at a relatively low temperature, a method for producing the same, and an impregnated wood with the wood modifier.

  Examples of modifiers for improving the mechanical strength of wood include plastic wood that has been polymerized by impregnating low-viscosity resin monomers into the wood voids, acetyl wood that has been ester-polymerized with hydroxyl groups of wood, and silicic acid compounds There are known modifiers combined with ceramics impregnated with wood.

  The ceramic wood described in Patent Document 1 is hardened by forcibly injecting a ceramic sol or a mixed solution of a ceramic sol and an aqueous metal salt solution into a gap in the wood under reduced pressure.

  The wood modifier described in Patent Document 2 is modified by imparting slipperiness, strength, water resistance, water repellency and the like to the surface of wood or the like made of an organosilane compound and an amino alcohol compound.

  Moreover, the manufacturing method of the modified wood described in Patent Document 3 is provided with an infiltration hole in the wood by laser processing, and a silicic acid compound such as alkali silicate or colloidal silica is immersed in the wood under reduced pressure. It is intended to impart flame retardancy to wood by gelation.

  These methods require processing such as the formation of permeation holes, discoloration and damage the original texture of wood, unreacted acids and bases remain in the wood, resulting in unstable dimensions, and organosilane compounds There are problems such as requiring expensive chemical solutions.

  Also known as preservatives are oil-soluble preservatives using tars or phenols, water-soluble preservatives composed of compounds such as arsenic, chromium and copper, and water-soluble preservatives containing troponoid metal complexes. However, preservatives containing troponoid compounds are known as environmentally friendly preservatives due to odor, safety and health problems, and the like.

  The wood preservative described in Patent Document 4 has α, β, γ-tyaprisin, α, β, γ-drabrin or a troponoid metal complex composed of tropolone and metal as an active ingredient, and this is injected into wood under pressure, vacuum By injecting, it is possible to provide wood that is safe for the human body, has a high antiseptic effect, and has excellent adhesion to wood.

However, this is a preservative to the last, and effects such as improvement in the strength of wood cannot be obtained as with the modifier. Further, in order to use such a wood preservative in combination with the modifying agent so as to have both the modifying effect and the preserving effect, it is necessary to impregnate the wood with each of these solvents, and the process becomes complicated.
Japanese Patent Laid-Open No. 10-166315 JP 2001-181599 A JP 2002-120204 A JP-A-9-175916

  Therefore, the problem to be solved by the present invention is to impregnate wood with a glass component, improve flame retardancy and hardness, have antiseptic and ant-proofing effects, make the surface hydrophobic, and give it a gloss. It is an object to provide a wood-impregnated wood treated with the wood modifier, a method for producing the wood modifier, and the wood modifier.

  The wood modifier according to claim 1 of the present invention is a sodium silicate generated by dissolving and heating a tropolone-containing wood extract-boric acid mixed aqueous solution in which boric acid is dissolved in a wood extract containing tropolones in sodium silicate. The gist is that the water in the liquid is volatilized and dehydrated. Specifically, it is desirable to blend at a ratio of 5 parts by weight or less of boric acid with respect to 100 parts by weight of sodium silicate.

  The glass-impregnated wood according to claim 2 of the present invention is formed by applying the wood modifying agent according to claim 1 to the surface of the wood, or impregnating by a reduced pressure method, and performing a curing treatment at a predetermined temperature. This is the gist.

  In the method for producing a wood modifier according to claim 3 of the present invention, boric acid is dissolved in a wood extract obtained by immersing wood in water for a predetermined period to extract tropolones, and this tropolone-containing wood extract-boric acid mixed solution is dissolved. The gist of the invention is to melt the sodium silicate and heat it, volatilize the water in the sodium silicate liquid and concentrate the sodium silicate liquid.

  According to the wood modifier of claim 1, the tropolone-containing wood extract-boric acid mixed aqueous solution is dissolved and heated in sodium silicate to form a siloxane bond-containing aqueous solution. Therefore, when this siloxane bond-containing aqueous solution is impregnated into wood, and the siloxane bond is polymerized, the wood substrate is vitrified, improving the flame retardancy and hardness of the wood, and providing antiseptic and ant-proofing effects. The surface of the wood can be made hydrophobic, further glossy, and modified without impairing the texture of the wood. In addition, even wood such as thinned wood can be finished beautifully and in a high-quality wood.

  Since the glass-impregnated wood according to claim 2 is polymerized and vitrified by the siloxane bond-containing aqueous solution soaked in the wood, it not only has improved flame retardancy, but also has antiseptic and ant-proofing effects. Very suitable for building materials. In addition, the aqueous solution containing siloxane bonds penetrates into the cell walls and conduits of wood and vitrifies, preventing the implantation of decaying fungi and suppressing the oxidation of lignin. Can withstand the use of

  According to the method for producing a wood modifier according to claim 3, since a tropolone-borate ion complex composed of tropolone and boric acid extracted from wood is added to sodium silicate to produce a siloxane bond-containing aqueous solution. If it is economical to use for large wood such as building materials such as tropolones derived from natural materials and relatively low environmental harm, and low cost general-purpose sodium silicate and boric acid. There is little harm to the surrounding environment. Moreover, since it is water-soluble and easily soaks into wood, it is not necessary to perform processing such as providing a permeation hole in the wood in advance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an outline of the production process of the wood modifier of the present invention. First, as wood 10 for extracting tropolones, 3 kg of waste rice cedar is used here, and this is immersed in 10 liters of water for 10 days to produce wood extract 12. This wood extract contains a tropolone compound represented by the following formula 1 and contains, for example, hinokitiol represented by C ₁₀ H ₁₂ O ₂ , β, γ-tyaprisin, and the like.

（式中、Ｒは水素原子、低級アルキル基、低級アルケニル基を示す。）

(In the formula, R represents a hydrogen atom, a lower alkyl group, or a lower alkenyl group.)

  50 g of boric acid 14 is added to 1 liter of wood extract 12 and dissolved by stirring. At this time, tropolones in the wood extract and boric acid react to form a tropolone-borate ion complex represented by the following formula.

（式中、Ｒは水素原子、低級アルキル基、低級アルケニル基、ｍは１〜３の整数を示す。）

(In the formula, R represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, and m represents an integer of 1 to 3.)

This 1 liter of tropolone-borate ion complex aqueous solution 16 is mixed with 1 liter of sodium silicate Na ₂ .nSiO ₂ (OH) ₂ (n = 0.5-5) to obtain a tropolone-borate ion complex-sodium silicate. A mixed solution 20 is prepared. Here, it is preferable that sodium silicate has a relatively large n, that is, a relatively small sodium content. This is because sodium contained in a trace amount in the glass strengthens the glass, but on the other hand, if sodium remains in the finished modified wood, it is not preferable in terms of dimensional stability of the wood.

  In general, when boric acid is added to sodium silicate, sodium ions of boric acid and sodium silicate cause a neutralization reaction, polymerization of polysilicate ions and formation of siloxane bonds progress, and the viscosity of sodium silicate increases and becomes cloudy. It is known to form silica gel.

  It is also known that when sodium silicate is simply heated, a siloxane bond is generated by dehydration polymerization of silanol groups of sodium silicate and a thin gel film is generated on the surface of the sodium silicate. However, in this case, the gel film is very brittle because the Si—O—Na bond of sodium silicate is stable and the polymerization of the siloxane bond does not proceed.

  Based on these, the borate ion complex in the tropolone-borate ion complex-sodium silicate mixed solution 20 neutralizes the alkali of sodium silicate and grows a siloxane bond, while dehydration reaction with the hydroxyl group of sodium silicate. It is believed that they have two opposing effects of bonding and preventing siloxane bond growth.

  Therefore, if the amount of the aqueous solution of tropolone-borate ion complex is too large relative to sodium silicate, a vigorous neutralization reaction between sodium ion and borate ion of sodium silicate occurs, accompanied by rapid growth of siloxane bonds. Will form silica gel. Therefore, it is desirable that the mixing ratio of sodium silicate and tropolone-borate ion complex aqueous solution be 5 parts by weight or less of boric acid with respect to 100 parts by weight of sodium silicate.

  When this tropolone-borate ion complex-sodium silicate mixed solution 20 is heated, a thin gel-like film 22 is formed on the surface. This is because when the tropolone-borate ion complex-sodium silicate mixed solution 20 is heated, silanol Si—OH in the solution forms a siloxane bond, and this siloxane bond further grows by dehydration polymerization, and sodium and tropolone- A gel containing a siloxane bond containing a small amount of a borate ion complex.

  Furthermore, the tropolone-borate ion complex-sodium silicate mixed solution 20 is kept at 70 to 80 ° C. for about 30 minutes to evaporate moisture and promote dehydration polymerization of siloxane bonds. Thereafter, when the heating is stopped and the mixture is allowed to cool, the gel film 22 is dissolved again in the solution.

  After applying the aqueous solution 24 containing the siloxane bond which volatilized the water | moisture content etc. from this tropolone-borate ion complex-sodium silicate mixed solution 20 to the wood 26 as a wood modifier, and drying at normal temperature, 120 to 300 degreeC And cured.

  Through these treatments, a glass film coated wood 28 provided with a glossy hydrophobic glass film on the surface of the wood 26 was manufactured. The hardness of the glass film on the surface of the glass-coated wood 28 is very hard, about 2H in pencil hardness before the curing process and 5H-6H after the curing process.

  As another example, the aqueous solution 24 containing the siloxane bond was injected into the wood 30 by a reduced pressure injection method. The siloxane bond-containing aqueous solution 24 was injected into a cypress material having a side of 10 cm and a thickness of 2 cm and having a water content of 15% at 5 to 9 atm. At this time, the siloxane bond-containing aqueous solution 24 impregnated wood with about 5 mm from the surface, and the weight increased by about 20%.

  When the wood impregnated with the aqueous solution 24 containing siloxane bonds was cured at 120 ° C. for 30 minutes, it was cured to a depth of about 3 mm from the surface. And it confirmed that the said siloxane bond containing aqueous solution 24 did not melt | dissolve this pressure-impregnated glass impregnated wood 32 under reduced pressure.

  When this cured glass-impregnated wood 32 was blown with a flame from a burner and the flame retardancy was confirmed, the portion directly hit by the flame turned black, but it burned to the back even if the flame was applied for 10 minutes. There was no.

  Furthermore, after applying the siloxane bond-containing aqueous solution 24 to the glass-impregnated wood 32 that has been subjected to the curing treatment, and also performing a curing treatment at 120 ° C. to 300 ° C., a titanium oxide-based outdoor photocatalyst coat was applied. It was confirmed that the white-waxing effect that occurs when coating on the urethane coating was not generated.

    As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in this example, a tropolone-borate ion complex was produced from a wood extract prepared by immersing wood in water, but in addition to the wood extract, a tropolone compound produced from a tea component or the like, It can also be replaced with an aqueous solution produced from other natural or synthetic products.

  Instead of sodium silicate, colloidal silica obtained by removing sodium of sodium silicate by an ion exchange method may be used.

  Further, the siloxane bond-containing aqueous solution 24 may be mixed with a general-purpose ultraviolet protective water-based urethane coating to add UV protection properties to the properties such as hydrophobicity and flame retardancy.

  Further, if a paper product or the like is immersed in the siloxane bond-containing aqueous solution 24 and subjected to a curing treatment, a flame-retardant paper product can be obtained.

  The wood modifier of the present invention improves the strength of wood, imparts flame retardancy, makes its surface hydrophobic and gloss, and has a wide range of uses and sizes from furniture and crafts to building materials. It can be used to modify wood.

It is the figure which showed the outline of the manufacturing process of the wood modifier of this invention.

Explanation of symbols

12 Wood extract 16 Tropolone-borate ion complex aqueous solution 20 Tropolone-borate ion complex-sodium silicate mixed solution 24 Siloxane bond-containing aqueous solution

Claims (3)

  A wood modifier produced by dehydration polymerization of a tropolone-containing wood extract-boric acid mixed aqueous solution in which boric acid is dissolved in a wood extract containing tropolones and dissolved in sodium silicate and heated. .   The wood modifier according to claim 1 is applied to the surface of wood, or impregnated by a reduced pressure method, a hot bath injection method or a dipping method, and subjected to a curing treatment at a predetermined temperature. Glass impregnated wood. Boric acid is dissolved in a wood extract obtained by immersing wood in water for a predetermined period to extract tropolones, and this tropolone-containing wood extract-boric acid mixed solution is melted in sodium silicate and heated. A method for producing a wood modifier, characterized in that water is volatilized to concentrate a sodium silicate solution.

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