JP5995418B2 - Wood material processing method, wood material processed by the method and use thereof - Google Patents

Description

  The present invention relates to a method for treating a wood material such as wood, and more particularly to a treatment method for the purpose of dimensional stabilization and surface hardening of a wood material. Moreover, this invention relates to the woody material processed by the said processing method, and its use.

  Wood materials such as wood, plywood, particle board, MDF (Medium Density Fiber), or LVL (Laminated Veneer Label) (hereinafter simply referred to as “woody material”) are stretched and shrunk due to changes in water content as a natural property of wood. As a result, dimensional changes occur. In addition, since the thickness, width, and the degree of dimensional change in the length direction are different, there is a drawback that deviation such as warpage or twisting occurs.

  Furthermore, cedar and cypress, which are wood materials having a low specific gravity and a relatively soft surface, are susceptible to scratches on the surface and are difficult to use for flooring materials, interior materials or table tops.

  Conventionally, various dimensional stabilization treatments or surface hardening treatments have been performed as methods for solving the inherent disadvantages of these woody materials. For example, there is a method in which a wood material is impregnated with an initial condensate such as urea resin, melamine resin, or phenol resin, and then these resins are heated and cured to fill the cell lumen, cell gap, and cell wall of the wood material. . However, in this method, since the initial condensate has high polymerizability, the pot life of the processing liquid is short and it is difficult to reuse the processing liquid. Further, there is a problem that a lot of free formalin is generated from the woody material after the treatment.

  Therefore, as another method, Patent Document 1 below proposes a method in which a catalyst is added to an initial condensate of formaldehyde, urea, and glyoxal, and then impregnated into a wooden material and heat-cured.

Japanese Examined Patent Publication No. 6-67564

  By the way, in the method of Patent Document 1, the initial condensate of formaldehyde, urea and glyoxal has low self-polymerizability, and the pot life of the treatment liquid can be long and reused. Also, free formalin after heat curing can be greatly reduced as compared with the urea resin, melamine resin, phenol resin and the like.

  However, this initial condensate reacts with cellulose molecules in the cell wall constituting the wood material, and crosslinks this to reinforce the cell wall of the wood material, thereby achieving dimensional stability and surface hardening. Therefore, this initial condensate is less effective in filling the cell lumen, cell gap and cell wall of the wood material than the above urea resin, melamine resin, phenol resin, etc. The effect was not sufficient. In addition, this initial condensate has a problem that yellowish browning inherent to the resin occurs.

  On the other hand, a method has been proposed in which polyglycols are used in combination with an initial condensate of formaldehyde, urea and glyoxal, and the filling effect is reinforced by a reaction product of the initial condensate and polyglycols. However, this method has a problem that when the filling amount is increased, unreacted substances remain after heat-curing, and stickiness remains on the surface of the wooden material. Furthermore, there has been a problem that the surface of the woody material after the treatment is yellowed and browned by light.

  In view of the above, the present invention copes with the above-described problems and greatly improves the dimensional stability of the wood material against changes in the moisture content, and also forms a hard surface with no surface stickiness due to residual unreacted materials. Therefore, it is an object of the present invention to provide a method for treating a wood material that is unlikely to be scratched on the surface of the wood material and that can greatly improve discoloration such as yellowing due to light. Moreover, an object of this invention is to provide the woody material processed by the said method, and its use.

  In solving the above-mentioned problems, the present inventors, as a result of intensive research, formulated the addition product of a cyclic urea compound and glyoxal as the main agent, thereby stabilizing the size of the woody material, surface hardening without surface stickiness, And it discovered that the discoloration by light could be improved significantly and came to completion of this invention.

That is, according to the description of claim 1, the wood material processing method according to the present invention,
A first component comprising an addition product of 2-imidazolidinone and glyoxal;
Impregnating a woody material with a treatment liquid containing a second component composed of 4,5-dihydroxy-2-imidazolidinone or a derivative thereof;
The first component and the second component are reaction-cured in the wood material.

According to the above configuration, the first component composed of an addition product of 2-imidazolidinone and glyoxal, which is a cyclic urea compound impregnated in a wood material , is 4,5-dihydroxy-2-imidazolidinone or its The reaction product is cured by reaction with the second component made of the derivative, and the reaction product is filled into the cell lumen, cell space, and cell wall of the woody material. As a result, the strength of the wood material is improved, and further, the surface of the wood material is cured and the surface strength is also improved.

  Further, the second component composed of 4,5-dihydroxy-2-imidazolidinone or a derivative thereof impregnated in the wood material has a possibility of crosslinking between cellulose molecules constituting the cell wall of the wood material. . This improves the strength of the cell wall of the wood material and further stabilizes the size of the wood material against changes in the moisture content.

  Moreover, the said 1st component and 2nd component do not leave the stickiness of the wooden material surface by an unreacted substance, and do not produce discoloration, such as yellowish browning by light.

  Therefore, in the first aspect of the invention, the dimensional stability of the wood material with respect to the change in the moisture content is greatly improved, and there is no stickiness of the surface due to residual unreacted material, so that a hard surface is formed. It is possible to provide a method for treating a woody material that is less likely to be scratched on the surface of the material and that can greatly improve discoloration such as yellowish browning due to light.

Moreover, according to the description of Claim 2, this invention is the processing method of the wooden material of Claim 1,
In addition to the first component and the second component, a wood material is impregnated with a treatment liquid containing a third component made of glycols,
In the wood material, the third component is reacted and cured together with the first component and the second component.

  According to the said structure, in addition to a 1st component and a 2nd component, you may make it add the 3rd component which consists of glycols. This third component is reacted and cured together with the first component and the second component described above, and the reaction product is filled into the cell lumen, cell space, and cell wall of the woody material. As a result, the strength of the wooden material is improved, and the surface of the wooden material is cured to improve the surface strength. Further, the dimensional stability of the wood material against the change in the moisture content can be achieved.

  Therefore, also in the processing method of the woody material of Claim 2, the effect similar to the invention of Claim 1 can be achieved.

Moreover, according to the description of Claim 3, this invention is the processing method of the wooden material of Claim 1 or 2,
The first component is characterized in that 0.9 mol to 1.2 mol of glyoxal is added to 1 mol of 2 -imidazolidinone.

  According to the said structure, the addition product of the 1st component has added 2-component 2-imidazolidinone and glyoxal in the ratio close | similar to equimolar number. That is, it is limited to the range of 0.9 mol to 1.2 mol of glyoxal with respect to 1 mol of 2-imidazolidinone.

  Therefore, in the addition product produced | generated from this reaction, possibility that the both ends of the molecule | numerator will be comprised from a different component becomes high. Accordingly, there are many opportunities for the molecules of the first component to cause a self-polymerization reaction in the woody material. As a result, the degree of polymerization of the polymer filled in the cell lumen, cell gap and cell wall of the wood material is increased, and the strength improvement and dimensional stabilization of the wood material due to the filling effect are further improved.

  Therefore, also in the processing method of the woody material of Claim 3, the effect similar to the invention of Claim 1 or 2 can be achieved more concretely.

Moreover, according to the description of Claim 4, this invention is the processing method of the wooden material as described in any one of Claims 1-3,
The second component is
1,3-dimethyl-4,5-dihydroxy-2-imidazolidinone, 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone, 1,3-bis (hydroxyethyl)- It comprises at least one selected from the group consisting of 4,5-dihydroxy-2-imidazolidinone.

  According to the above configuration, the second component is preferably a specific derivative of 4,5-dihydroxy-2-imidazolidinone. That is, a compound in which a methyl group, a hydroxymethyl group, or a hydroxyethyl group is added to the two nitrogen atoms at the 1-position and the 3-position in the 4,5-dihydroxy-2-imidazolidinone molecule is preferable. Further, the second component may be a blend of these derivatives.

  These second components have high reactivity with the cellulose molecules constituting the cell wall of the woody material, and firmly bridge the cellulose molecules. Also, the polymer of the first component or the polymer of the first component and the third component reacts well to cross-link between the polymers, or cross-link between the polymer and cellulose molecules constituting the cell wall. . This further improves the strength of the wooden material and further stabilizes the size of the wooden material.

  Therefore, also in the processing method of the woody material of Claim 4, the effect similar to the invention as described in any one of Claims 1-3 can be achieved more concretely.

Moreover, according to the description of claim 5, the processing method of the wooden material according to the present invention,
A first component comprising an addition product obtained by adding 0.9 mol to 1.2 mol of glyoxal to 1 mol of 2-imidazolidinone;
A second component consisting of 1,3-bis (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone,
If these contents are solid content ratio (weight ratio) and the first component is 1, the wood material is impregnated with a treatment liquid in which the second component is in the range of 3-6,
The first component and the second component are reaction-cured in the wood material.

  According to the above configuration, in the first component in which two components are added at a ratio close to the equimolar number, there is a high possibility that both ends of the molecule are composed of different components. Accordingly, there are many opportunities for the molecules of the first component to cause a self-polymerization reaction in the woody material. As a result, the degree of polymerization of the polymer filled in the cell lumens, cell gaps, and cell walls of the woody material is increased.

  On the other hand, 1,3-bis (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone, which is the second component, has a high reactivity with the cellulose molecules constituting the cell wall of the woody material. Is firmly cross-linked. Moreover, it reacts well with the polymer of the first component to crosslink between the polymers, or to crosslink between the polymer and cellulose molecules constituting the cell wall. This further improves the strength of the wooden material and further stabilizes the size of the wooden material.

  Furthermore, according to the said structure, the solid content ratio (weight ratio) of a 1st component and a 2nd component is made into a predetermined range, By this, the filling of the cellular material of a woody material, a cell space | interval, and a cell wall, Crosslinking between cellulose molecules constituting the cell wall, crosslinking between polymers of the first component, and crosslinking between the polymer and cellulose molecules constituting the cell wall can be performed more efficiently.

  Further, by blending the first component and the second component at the solid content ratio, a hard surface is formed without leaving any stickiness of the surface of the wood material due to unreacted substances, and discoloration such as yellowish browning due to light occurs. There is nothing.

  Therefore, in the method for treating a wood material according to claim 5, the dimensional stability of the wood material against a change in moisture content is greatly improved, and there is no stickiness of the surface due to residual unreacted material, and a hard surface is formed. Therefore, it is possible to provide a method for treating a wood material that is unlikely to be scratched on the surface of the wood material and that can greatly improve discoloration such as yellowish browning due to light.

Moreover, according to the description of Claim 6, the processing method of the wood material which concerns on this invention,
A first component comprising an addition product obtained by adding 0.9 mol to 1.2 mol of glyoxal to 1 mol of 2-imidazolidinone;
A second component comprising 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone;
A third component comprising dipropylene glycol,
If these contents are solid content ratio (weight ratio) and the said 1st component is set to 1, the said 2nd component exists in the range of 3-6, and the said 3rd component is the range of 2.5-5.5. Impregnating the woody material with the processing solution inside,
The first component, the second component, and the third component are reactively cured in the wood material.

  According to the above configuration, in the first component in which two components are added at a ratio close to the equimolar number, there is a high possibility that both ends of the molecule are composed of different components. Accordingly, there are many opportunities for the molecules of the first component to cause a self-polymerization reaction in the woody material. Further, dipropylene glycol as the third component reacts with the first component or a polymer thereof, and can also react with the second component. As a result, the degree of polymerization of the polymer filled in the cell lumens, cell gaps, and cell walls of the woody material is increased.

  On the other hand, 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone, which is the second component, has high reactivity with cellulose molecules constituting the cell wall of the woody material, The polymer of one component or the polymer of the first component and the third component reacts well to crosslink between the polymers, or to crosslink between the polymer and cellulose molecules constituting the cell wall. This further improves the strength of the wooden material and further stabilizes the size of the wooden material.

  Furthermore, according to the above configuration, by setting the solid content ratio (weight ratio) of the first component, the second component, and the third component to a predetermined range, the wood material enters the cell lumen, the cell gap, and the cell wall. Filling, crosslinking between cellulose molecules constituting the cell wall, crosslinking between the polymer of the first component or the polymer of the first component and the third component, and between the polymer and the cellulose molecules constituting the cell wall Crosslinking can be performed more efficiently.

  In addition, by blending the first component, the second component, and the third component at the solid content ratio, a hard surface is formed without leaving any stickiness of the surface of the wood material due to unreacted materials, and yellowish brown due to light, etc. No discoloration occurs.

  Therefore, in the method for treating a wood material according to claim 6, the dimensional stability of the wood material against a change in moisture content is greatly improved, and there is no stickiness of the surface due to residual unreacted material, and a hard surface is formed. Therefore, it is possible to provide a method for treating a wood material that is unlikely to be scratched on the surface of the wood material and that can greatly improve discoloration such as yellowish browning due to light.

According to the description of claim 7, the wood material according to the present invention is
A first component comprising an addition product of 2-imidazolidinone and glyoxal;
A treatment liquid containing a second component composed of 4,5-dihydroxy-2-imidazolidinone or a derivative thereof is reactively cured in a woody material.

  According to the above configuration, the dimensional stability of the wood material with respect to the change in the moisture content is greatly improved, and the surface of the wood material is scratched because there is no surface stickiness due to residual unreacted material and a hard surface is formed. Further, it is possible to provide a wood material that is difficult to stick and that can significantly improve discoloration such as yellowish browning due to light.

According to the description of claim 8, the laminated wood according to the present invention is
In the laminated lumber formed by stripping or / and laminating the secondary lamina formed by cascading the primary lamina made of the wood material according to claim 7,
The secondary lamina is characterized in that it has a longitudinally joined portion joined so that fiber directions of the grain of the primary lamina intersect each other.

  The said structure is related with the laminated material which concerns on one use of the wooden material which concerns on this invention, The wooden material of Claim 7 is employ | adopted for this laminated material. According to the above configuration, the laminated lumber is formed by cascading the primary laminaes that have been dimensionally stabilized to form a secondary lamina, and the secondary laminaes are separated or laminated, or the laminated and laminated It is configured to do both.

  Here, in the longitudinally connected portion between the primary laminaes, the fiber direction of one primary lamina grain intersects the fiber direction of the other primary lamina grain cascaded thereto. As a result, a portion where the fiber directions of the primary lamina grain intersect also occurs at the joint portion where the width is separated and the laminated joint portion.

  In conventional laminated wood, the degree of dimensional change in the thickness, width and length directions due to changes in the moisture content of the primary lamina is different. For example, when the width direction and the length direction are joined, the change in moisture content Along with this, distortion occurs at the joint site and peels off. This distortion cannot be prevented even if it is reinforced with an ant cross.

  On the other hand, in the laminated lumber having the above-described configuration, the wood material according to claim 7 is adopted for the primary lamina and dimensional stabilization is performed. As a result, the thickness, width, and length due to the change in the moisture content of the primary lamina. Any dimensional change in the vertical direction is reduced. Furthermore, the difference in the dimensional change in the thickness, width and length directions is reduced, and the fiber directions of the grain of the primary lamina can be crossed and joined.

  As a result, the laminated material having the above-described configuration is free from warping or twisting due to a change in moisture content. Furthermore, when this laminated material is used for the building operation, the joint portion where the fiber direction of the grain intersects is exposed to the surface, and a free combination independent of the fiber direction becomes possible, and the design of the laminated material can be improved. it can.

  Therefore, according to the eighth aspect of the present invention, the dimensional stability of the wood material with respect to the change in the moisture content is greatly improved, and there is no surface stickiness due to residual unreacted material, and a hard surface is formed. It is possible to provide a laminated material that is less likely to be scratched on the surface of the woody material and that can greatly improve discoloration such as yellowish browning due to light.

Moreover, according to the description of claim 9, the laminated wood according to the present invention,
In the laminated lumber formed by cascading or / and separating the secondary lamina formed by laminating the primary lamina made of the woody material according to claim 7,
The secondary lamina has a laminated portion joined so that fiber directions of the grain of the primary lamina intersect each other.

  The said structure is related with the laminated material which concerns on one use of the wooden material which concerns on this invention like the said Claim 8, The wooden material of Claim 7 is employ | adopted for this laminated material . According to the above configuration, the laminated lumber is composed of laminated primary laminaes that have been dimensionally stabilized to form a secondary lamina, and the secondary laminaes are cascaded or separated from each other, or longitudinally coupled to the width. Constructed by performing both strips.

  As a result, the laminated material having the above-described configuration does not cause a warp or a twist due to a change in moisture content, as in the case of claim 8. Furthermore, when this laminated material is used for the building operation, it is possible to enhance the design by exposing the joint portion where the fiber directions of the grain intersect to the surface.

  Therefore, also in the invention of the ninth aspect, the same effect as that of the eighth aspect can be exhibited.

It is a perspective view which shows 1st Embodiment of the laminated material using the wooden material which concerns on this invention. It is a perspective view which shows 2nd Embodiment of the laminated material using the wooden material which concerns on this invention.

  In the present invention, the woody material refers to a material made from wood or various materials prepared using wood as a raw material. As described above, wood, plywood, particle board, MDF (Medium) It includes those including Density Fiber (LDEN) or LVL (Laminated Veneer Number).

  In particular, solid wood is preferably subjected to dimensional stabilization treatment, and these woods may be any of conifers, hardwoods, such as cedar, cypress, pine, rajatar pine, etc. It may be a thing. Furthermore, oak, hippo, zelkova, teak, etc. excellent in surface design may be used. In particular, the present invention exerts a great effect in coniferous trees such as cedar and cypress with a soft surface and broad-leaved trees with low specific gravity.

  The use of the wood material processed by the processing method according to the present invention includes everything from building structural materials, interior materials such as interiors, flooring materials, furniture and tables, or laminated materials used for these purposes. There is. Here, the laminated wood is a plate or column obtained by bonding small pieces of wood. In order to use these laminated wood for a table top or flooring, dimensional stability against changes in moisture content It is particularly required to be resistant to scratching due to its properties and surface hardening.

In the present invention, the addition product of the cyclic urea compound and glyoxal constituting the first component of the treatment liquid is, for example, at least one of a plurality of nitrogen atoms of various cyclic urea compounds such as a 5-membered ring or a 6-membered ring. This is a general term for compounds in which glyoxal is added. In particular, in the present invention, an addition product of 2-imidazolidinone and glyoxal represented by the following chemical formula 1 is preferably used.
In Formula 1, n is an integer of 1 or more, one imino group of 2-imidazolidinone reacts with one aldehyde group of glyoxal, and 2-imidazolidinone and glyoxal alternately repeat polyaddition. An initial polymer is formed.

  The structure of both terminals of this initial polymer can be adjusted by changing the ratio of the number of moles of glyoxal added to 2-imidazolidinone. For example, if 2-imidazolidinone is used more than glyoxal, there are more imino groups of 2-imidazolidinone at both ends of the initial polymer, while glyoxal is used more than 2-imidazolidinone. For example, many aldehyde groups of glyoxal are present at both ends of the initial polymer.

  Here, the ratio of the number of moles of glyoxal added to 2-imidazolidinone may be any, but in the present invention, 0.9 mole of glyoxal is used per mole of 2-imidazolidinone. An initial polymer obtained by adding ~ 1.2 mol is preferred. In this way, by adjusting the ratio of the number of moles of 2-imidazolidinone and glyoxal to the same degree, a large amount of initial polymer having both imino groups and aldehyde groups at both ends as shown in Chemical Formula 1 can be prepared. Is done. As a result, the initial polymer constituting the first component is easily self-polymerized in the cell lumen, cell gap and cell wall of the woody material, and as a result, it is filled as a higher molecular weight resin.

Next, in the present invention, 4,5-dihydroxy-2-imidazolidinone or a derivative thereof constituting the second component of the treatment liquid is 4,5-dihydroxy-2-imidazolidinone shown in Chemical Formula 2 below. Itself,
And a generic term for compounds in which the hydrogen atoms of two imino groups of 4,5-dihydroxy-2-imidazolidinone are substituted with other groups. In particular, in the present invention, 1,3-dimethyl-4,5-dihydroxy-2-imidazolidinone, 3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone, 1,3-bis It is preferable to use at least one derivative selected from the group consisting of (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone.

First, the structural formula of 1,3-dimethyl-4,5-dihydroxy-2-imidazolidinone is shown in Chemical Formula 3 below.
In Chemical Formula 3, the hydroxyl groups at the 4th and 5th positions are reactive with cellulose molecules constituting the cell wall of the woody material, and a cross-linked structure is formed between these cellulose molecules to improve the strength and dimension stabilization of the cell wall. Contribute. These hydroxy groups also react with the high molecular weight resin obtained by self-polymerization of the initial polymer of Chemical Formula 1 to bond the cell wall with the resin filled in the cell lumen, cell space and cell wall of the wood material. Also plays a role. This improves the strength of the cell wall of the wood material and fills the cell lumen, cell gap and cell wall, and achieves good dimensional stability and surface hardening of the wood material.

Next, the structural formula of 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone is shown in the following chemical formula 4.
In the chemical formula 4, the hydroxymethyl groups at the 1-position and the 3-position are very highly reactive with the cellulose molecules constituting the cell wall of the woody material, form a strong cross-linked structure between the cellulose molecules, and improve the strength of the cell wall. Greatly contributes to dimensional stabilization. The hydroxyl groups at the 4th and 5th positions are also reactive with cellulose molecules, and form a crosslinked structure between the cellulose molecules. Furthermore, these hydroxymethyl groups or hydroxy groups react with the high molecular weight resin obtained by self-polymerization of the initial polymer of Chemical Formula 1, and the resin filled in the cell lumen, cell space and cell wall of the woody material. It also plays a role in connecting cell walls. This improves the strength of the cell wall of the wood material and fills the cell lumen, cell gap and cell wall, and achieves good dimensional stability and surface hardening of the wood material.

Next, the structural formula of 1,3-bis (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone is shown in Chemical Formula 5 below.
In Chemical Formula 5, the 1- and 3-position hydroxyethyl groups are reactive with cellulose molecules constituting the cell wall of the woody material, and form a cross-linked structure between the cellulose molecules to improve the strength and dimensional stability of the cell wall. A big contribution. The hydroxyl groups at the 4th and 5th positions are also reactive with cellulose molecules, and form a crosslinked structure between the cellulose molecules. Further, these hydroxyethyl groups or hydroxy groups react with the high molecular weight resin obtained by self-polymerization of the initial polymer of Chemical Formula 1, and the resin filled in the cell lumen, cell space and cell wall of the wood material It also plays a role in connecting cell walls. This improves the strength of the cell wall of the wood material and fills the cell lumen, cell gap and cell wall, and achieves good dimensional stability and surface hardening of the wood material.

  Next, in the present invention, the glycols constituting the third component of the treatment liquid are dihydric alcohols such as ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3- Various things such as butylene glycol, trimethylene glycol, hexamethylene glycol and the like can be used. In the present invention, monoethers of the above glycols are also included as long as they have hydrophilicity.

  In particular, in the present invention, an alkylene glycol having an alkyl group having 3 to 8 carbon atoms is preferable as the glycol, and among them, dipropylene glycol is more preferable.

  When these glycols are used together as the third component of the treatment liquid, the hydroxy group of the glycols reacts with the aldehyde group of the first component or the hydroxy group, hydroxymethyl group, hydroxyethyl group of the second component, It will contribute to the crosslinking effect.

  Further, in the present invention, even when glycols are used in combination, stickiness due to unreacted substances does not remain because the first component and the second component are contained.

  A catalyst is used in combination for each reaction of the first component, the second component, and the third component. As the catalyst, a protonic acid or a Lewis acid is used. For example, zinc chloride, magnesium chloride, phosphoric acid, paratoluenesulfonic acid, various organic amine hydrochlorides, and the like can be used. The type and amount of these catalysts are appropriately adjusted depending on the reaction temperature and reaction time.

  Hereinafter, the processing method of the wooden material which concerns on this invention is demonstrated according to each process. However, the present invention is not limited only to the following steps. Further, the shape of the wood material to be processed may be any shape, and may be a plate material, a column material, a lamina for correction material, or the like.

A. Treatment liquid adjustment step The treatment agent is adjusted by blending the above-mentioned first component, second component and catalyst. Moreover, a 3rd component is mix | blended as needed. All of these components, including the initial polymer of the first component, are water-soluble substances having many hydrophilic groups, and the treatment liquid is preferably an aqueous solution. Moreover, you may mix | blend some solvents other than water, for example, alcohols, such as isopropyl alcohol, with a process liquid as needed. In the case where the treatment liquid is an aqueous solution, a drying treatment or a cleaning treatment performed if necessary becomes easy, and the working environment is also improved.

  The amount of each component to be applied to the wood material may be adjusted as appropriate depending on the type and shape of the wood material and the application to be used, but the rate of weight increase relative to the absolute dry weight of the wood material due to the solid content of the reaction resin after the reaction described below Is preferably in the range of 8% to 80%. When the solid content of the reaction resin applied to the wood material is within the above range, the cellular material is filled into the cell lumen, cell gaps and cell walls, and the cellulose molecules constituting the cell wall are sufficiently crosslinked. Is called. As a result, the dimensional stability of the wooden material is sufficiently achieved, and the surface hardening is increased in proportion to the rate of weight increase.

  On the other hand, the blending ratio of each component in the treatment liquid may be adjusted as appropriate according to the type and shape of the wood material and the intended use. For example, in the case of a treatment liquid in which the first component and the second component are blended, the first component is preferably 1 in terms of solid content ratio (weight ratio), and the second component is preferably in the range of 3 to 6, More preferably, the second component is in the range of 4-5. Moreover, when mix | blending a 3rd component with this process liquid, when the 1st component is set to 1 by a solid content ratio (weight ratio), a 2nd component exists in the range of 3-6, and a 3rd component is 2 The second component is preferably in the range of 4 to 5, and the third component is more preferably in the range of 3.5 to 4.5. .

  When the mixing ratio of each component in the treatment liquid is within the above range, the wood material is filled into the cell lumen, cell gap and cell wall, cross-linked between cellulose molecules constituting the cell wall, and the polymer of the first component Or the bridge | crosslinking between the polymers of a 1st component and a 3rd component and the bridge | crosslinking between the said polymer and the cellulose molecule which comprises a cell wall can be performed more efficiently.

  In the treatment liquid, various auxiliary agents used for the treatment of the woody material can be used in combination as long as the effects of the present invention are not affected. These auxiliaries include, for example, coloring agents, antiseptics, fireproofing agents, insecticides, antproofing agents, cracking preventing agents and the like. Furthermore, instead of using these auxiliaries in combination with the treatment liquid, treatments with various auxiliaries may be combined before and after the treatment method according to the present invention.

B. Treatment liquid impregnation step The wood material is impregnated with the treatment solution prepared in the treatment solution adjustment step. The impregnation method is a method used in various treatments of wood materials, such as normal pressure treatment methods such as coating method, spraying method, dipping method, hot and cold bath method, vessel method, rubing method, lorry method, dry method. There are pressure treatment methods such as an injection method, a pressure injection method, and a vacuum injection method. In the present invention, the reduced pressure / pressurized alternating method (OPM method) is preferable in order to sufficiently impregnate the treatment solution into the cell lumen, the cell gap and the cell wall through the wood material.

  Specifically, after the wood material is loaded into a pressure vessel which is an impregnation device, the inside of the device is depressurized to deaerate the air present in the cell lumen, cell gap and cell wall of the wood material. Thereafter, the treatment liquid is supplied into the apparatus under reduced pressure, and the wood material is immersed in the treatment liquid. Next, by pressurizing the inside of the apparatus stepwise and maintaining the pressurized state for a predetermined time, the treatment liquid can be sufficiently impregnated into the cell lumen, the cell gap and the cell wall of the woody material.

  The amount of impregnation of the treatment liquid into the wood material varies depending on the content of each component in the treatment liquid and the amount of voids in the wood material, but in the present invention, usually 60% to 400% with respect to the weight of the wood material. It is preferable to be within the range.

  As described above, since the impregnation step is performed at room temperature, the reaction of each component does not proceed even when the treatment liquid contains a catalyst, and the reactivity of the treatment liquid remains. . As a result, the treatment liquid remaining in the impregnation apparatus without being impregnated in the cell lumen, cell gap, and cell wall of the woody material can be recovered and reused in the next impregnation step.

C. Reaction Step The wood material impregnated with the treatment liquid is taken out from the impregnation apparatus and sufficiently dried in the drying apparatus. Since drying is usually performed within a range of 40 ° C. to 90 ° C., the reaction of each component does not occur at the stage of 90 ° C. or less. The wood material is dried according to a kiln dry drying schedule from raw materials according to the tree species and dimensions. It can also be dried by heating in a vacuum state.

  Next, the dried wood material is heat-treated in a heat treatment apparatus, and the reaction of each component proceeds. The conditions for the heat treatment may be appropriately selected depending on the shape of the wood material, the type of each component, the type of reaction catalyst, and the amount used. For example, in the case of a plate material having a thickness of about 1 mm to 20 mm, the temperature is 110 ° C. to 160 ° C. The reaction is carried out in minutes to 30 minutes.

  By this reaction, the first component in the treatment liquid is self-polymerized and filled into the cell lumen, cell gap and cell wall of the wood material, and the second component cross-links between the cellulose molecules on the cell wall to form the wood material. Improve cell wall strength. Moreover, the resin in which the first component is self-crosslinked, the second component, and the third component react to further achieve dimensional stability and surface hardening of the wood material.

  Hereinafter, in the method for treating a wood material according to the present invention, the following treatments were performed.

  A white cedar board material having a thickness of 20 mm, a width of 110 mm, and a length of 700 mm was used as the wood material. The treatment liquid is 104 g / liter of an aqueous solution (solid content: 40% by weight) of a compound obtained by reacting 2-imidazolidinone and glyoxal as equimolar numbers as the first component, and 1,3-bis as the second component. An aqueous solution (solid content: 40% by weight) of (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone and 470 g / liter of an aqueous magnesium chloride solution (solid content: 25% by weight) as a catalyst were 99 g / liter. An aqueous solution containing was prepared.

  White impregnation board material was loaded into the impregnation apparatus, and the inside of the impregnation apparatus was maintained at a reduced pressure of 25 mmHg for 120 minutes. Then, the said process liquid was supplied in the impregnation apparatus, maintaining the pressure-reduced state, and the white hand cedar board | plate material was immersed in the process liquid. Next, pressurize the inside of the impregnation apparatus to 0.2 MPa and maintain this state for 30 minutes, and then pressurize the interior of the impregnation apparatus to 0.4 MPa and maintain this state for 30 minutes. The treatment solution was impregnated into the cell lumen, cell gap, and cell wall of white cedar board by pressurizing up to 0.5 MPa and pressurizing the solution for 60 minutes. The amount of impregnation at this time was 330% with respect to the weight of the white hand cedar board.

  After impregnation, the white hand cedar board material is taken out from the impregnation apparatus, dried in a drying apparatus at room temperature of 50 ° C. and humidity of 60% for 1 day, and subsequently dried in a drying apparatus at room temperature of 60 ° C. and humidity of 50% for 3 days. It was dried for 3 days in a drying apparatus having a final room temperature of 80 ° C. and a humidity of 40%. The dried white cedar board material was heat-treated in a 120 ° C. heat treatment apparatus for 30 minutes to react each component, and the first component and the second component were reacted and cured. The amount of resin charged by this reaction was 71% with respect to the absolute dry weight of the white hand cedar board.

  A cypress plate having a thickness of 20 mm, a width of 110 mm, and a length of 700 mm was used as the wood material. The same prescription as in the first example was adopted as the treatment liquid. However, the recovered treatment liquid remaining in the impregnation apparatus in the first embodiment was reused as a part of the treatment liquid of the second embodiment. Specifically, 80% by volume of the collected treatment liquid and 20% by volume of the newly prepared treatment liquid were mixed and used.

  The treatment liquid impregnation step and the reaction step were performed in the same manner as in the first example. The amount of impregnation in the impregnation step was 270% with respect to the weight of the cypress plate. Moreover, the filling amount of the resin in the reaction process was 60% with respect to the absolute dry weight of the cypress plate.

  A red-handed cedar board having a thickness of 20 mm, a width of 110 mm, and a length of 700 mm was used as the wood material. In the treatment liquid, an aqueous solution (solid content: 40% by weight) of a compound obtained by reacting 2-imidazolidinone and glyoxal as equimolar numbers as the first component was 62 g / liter, and 1,3-as the second component. An aqueous solution (solid content: 40% by weight) of bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone was 280 g / liter, and dipropylene glycol (100% product) was 93 g / liter as the third component. Then, an aqueous solution containing 93 g / liter of an aqueous magnesium chloride solution (solid content: 25% by weight) as a catalyst was prepared.

  The treatment liquid impregnation step and the reaction step were performed in the same manner as in the first example. The impregnation amount in the impregnation step was 280% with respect to the weight of the red-handed cedar board. Moreover, the filling amount of the resin in the reaction process was 53% with respect to the absolute dry weight of the red-handed cedar board.

  Next, the wood materials treated in Examples 1 to 3 were evaluated. Evaluation items include a shrinkage rate test for evaluating dimensional stability, a pencil hardness test and caster test for evaluating scratch resistance on a surface, a light resistance test for evaluating anti-scratch properties by light, and a finger for evaluating surface stickiness. A test was conducted. Hereinafter, each test item and evaluation results will be described.

a. Shrinkage test (evaluation of dimensional stability):
Evaluation of dimensional stability against changes in moisture content is based on values of dimensional change (shrinkage) in the thickness direction (grid direction), width direction (grain direction), and length direction (fiber direction) of the wood material. did. In the present invention, this evaluation method employs the total shrinkage rate (%) as referred to in accordance with JIS-Z2103 “Method for measuring shrinkage rate of wood”. In addition, the test piece for evaluation used what was taken from the side surface of two-sided wood (plate face).

  In this evaluation method, the values of dimensional change (total shrinkage) in the thickness direction (grid direction), width direction (sheet direction) and length direction (fiber direction) of the wood material are all 2% or less. It is preferable that When the value of each dimensional change rate (total shrinkage rate) is 2% or less, the wooden material is not warped or twisted due to the change in moisture content.

b. Pencil hardness test (evaluation of scratch resistance):
A pencil hardness test was adopted as a method for evaluating the scratch resistance of the surface. In this invention, this evaluation method was based on JIS-K5400 "Pencil scratch test method". The surface of the wood material after dragging on the wood material with each load (300g, 700g, 1000g) applied with the core of each pencil of hardness 6B (hard) to B (soft) tilted at 45 degrees. The conspicuousness of the dent state was visually evaluated. An object in which the indentation is not conspicuous was evaluated as ◯ (good), and evaluated in three stages: △ (slightly defective) and × (defective), and was indicated by the hardness of the hardest pencil and the load at that time.

c. Caster test (evaluation of scratch resistance):
As a method for evaluating the scratch resistance of the surface, a caster test was further adopted. In the present invention, this evaluation method applies a load of 20 kg to one plastic double caster with two rotating wheels having a diameter of 50 mm and a width of 9 mm, and puts a twist of one time one way on a wooden material 35000. The depth and the conspicuousness of the dent after reciprocating were evaluated. The depth of the dent was not more than 30 μm and was inconspicuous, and was evaluated as “Good”, and evaluated in three stages: Δ (slightly poor) and × (defective).

d. Light resistance test (evaluation of anti-sparking property):
The evaluation of the anti-sparking property by light was carried out by irradiating the surface of the wood material with light, and evaluating both the brightness difference ΔL * and the color difference ΔE * ab before and after the irradiation. In the present invention, this evaluation method was based on WAS-1S (no watering) of JIS-D0205 “Weather resistance test method for automobile parts”. The lightness difference ΔL * and the color difference ΔE * ab were calculated according to JIS-Z8730 “color difference display method” for the discoloration after 150 hours irradiation with a sunshine weather meter (carbon arc lamp type). In the L * a * b * color system, the color difference ΔE * ab is expressed by the following equation:

ΔE * ab = [(Δa *) ² + (Δb *) ² + (ΔL *) ² ] ^1/2

It is represented by

e. Tentacle test (assessment of stickiness):
Evaluation of the surface stickiness due to the remaining unreacted material was evaluated in a finger touch state in which the resin does not adhere to the finger by touching the surface of the wooden material with the index finger. A sample having no stickiness was evaluated as “good” (good), and evaluated in three stages: Δ (slightly poor) and × (defective).

Table 1 shows the evaluation results for the wood materials treated in Examples 1 to 3 and untreated materials as comparative examples.
As can be seen from Table 1, the wood materials treated in Examples 1 to 3 all show good evaluation results. In the total shrinkage ratio indicating dimensional stability, the value of the total shrinkage ratio of each untreated material is large, and the difference in the values in the thickness direction, the width direction, and the length direction is large. In the woody material, the total shrinkage value is 2% or less, and there is almost no difference in values in the thickness direction, the width direction, and the length direction.

  Further, in the pencil hardness test showing the scratch resistance of the surface, each untreated material is very conspicuous with respect to the pencil having a hardness of 6B. The concavity is less noticeable. Further, in the caster test, the wood material of each example showed good results.

  Further, in the light resistance test showing the anti-discoloration property due to light, the values of the lightness difference ΔL * and the color difference ΔE * ab of each untreated material showed large values except for the red-handed cedar material. In the woody material, the values of the lightness difference ΔL * and the color difference ΔE * ab are both small, indicating good anti-burning properties. This shows an epoch-making result that the wood material of each example can always maintain a fresh wood color even in long-time use. In addition, it is considered that the lightness difference ΔL * and color difference ΔE * ab of each of the untreated materials in the red-handed cedar material are small, the hue of the original material is red, and it is difficult to stand out even if the color is changed by light.

  Moreover, in the finger test which shows the surface stickiness by the residue of an unreacted substance, stickiness is not felt in the woody material of each Example, The favorable result is shown.

  Therefore, in the present invention, the dimensional stability of the wood material against the change in moisture content is greatly improved, and the surface of the wood material is scratched because there is no stickiness of the surface due to residual unreacted material. Further, it is possible to provide a method for treating a wood material that can hardly improve discoloration such as yellowish browning due to light, and a wood material treated by the method.

  Next, as an application of the wood material excellent in dimensional stability and surface hardening obtained by the above wood material processing method, two embodiments will be described taking a laminated material as an example. Here, the laminated material is a plate material or a column material obtained by adhering small pieces of wood (hereinafter referred to as “lamina”) as described above, and these laminated materials are used as a table top plate or a floor material. For use, dimensional stability against changes in moisture content and scratch resistance due to surface hardening are particularly required.

First embodiment:
A primary lamina was prepared by forming the white cedar plate material processed in Example 1 to a predetermined size to constitute a laminated material. Table 1 shows the values of the dimensional change rate (total shrinkage rate) of these primary laminaes.

  FIG. 1 is a perspective view of the laminated material 10. The laminated material 10 is a single-layered laminated plate material, and is composed of three secondary laminaes 11, 12, and 13. Each of these secondary laminaes 11, 12, and 13 are connected to each other in the B direction (width direction) in the figure (see FIG. 1) by being separated (connected in the width direction) via an aqueous vinyl urethane resin.

  The secondary lamina 11 is composed of three primary laminaes 11a, 11b, and 11c. Each of the primary laminas 11a, 11b, and 11c is connected in a longitudinal direction (connected in the length direction) to the direction A in the figure. They are joined in the (length direction) (see FIG. 1).

  Here, the primary lamina 11a and 11c are arranged with the fiber direction of the grain parallel to the A direction (length direction) in the figure, while the primary lamina 11b has the fiber direction of the grain in the B direction (shown in the figure). (Parallel to the width direction). Accordingly, the primary laminas 11a and 11c and the primary lamina 11b are joined with the fiber directions of the grains being orthogonal to each other.

  The joint part 14a of the primary lamina 11a and the primary lamina 11b and the joint part 14b of the primary lamina 11c and the primary lamina 11b are joined together by finger joints via an aqueous vinyl urethane resin. The configurations of the secondary lamina 12 and the secondary lamina 13 are the same as the configuration of the secondary lamina 11.

  In the laminated material 10 configured in this way, the primary lamina grain fibers are joined so that the fiber directions thereof are orthogonal to each other. As described above, the value of the dimensional change rate of each primary lamina is 2%. Since it is as small as below (see Table 1) and has the same degree in the thickness, width and length directions, it does not cause warpage or twist.

  Moreover, the design property of the part joined so that the fiber direction of these primary lamina grain may orthogonally cross is high, and it can be used as a surface material.

  Therefore, in this first embodiment, since the dimensional change rate due to the change in the moisture content of the primary lamina is small, the fiber directions of the primary lamina grain can be crossed and joined, and a deviation such as warping or twisting occurs. In addition, there is no stickiness of the surface due to the residue of unreacted material, and a hard surface is formed, so that the surface of the wooden material is not easily scratched, and further, discoloration such as yellowing due to light is greatly improved, and The laminated material having high commercial value can be provided by the high design property of the cross-joined portion.

Second embodiment:
Next, another configuration example of the laminated material will be described. Also in this laminated material, the white cedar board material processed in the said Example 1 was shape | molded by the predetermined dimension, and the primary lamina was prepared.

  FIG. 2 is a perspective view of the laminated material 20. The laminated material 20 is a laminated material laminated in three layers, and is composed of three secondary laminaes 21, 22, and 23. These secondary laminaes 21, 22, and 23 are joined to each other in the C direction (thickness direction) in the figure via an aqueous vinyl urethane resin (see FIG. 2).

  The secondary lamina 21 is composed of three primary laminaes 21a, 21b, and 21c. These primary laminas 21a, 21b, and 21c are cascaded and joined in the A direction (length direction) in the figure. (See FIG. 2).

  Here, the primary lamina 21a and 21c are arranged with the fiber direction of the grain parallel to the A direction (length direction) in the figure, while the primary lamina 21b has the fiber direction of the grain in the B direction (illustrated). (Parallel to the width direction). Accordingly, the primary laminaes 21a and 21c and the primary lamina 21b are joined with the fiber directions of the wood grain orthogonal to each other.

  The joint part 24a between the primary lamina 21a and the primary lamina 21b and the joint part 24b between the primary lamina 21c and the primary lamina 21b are joined together by finger joints via an aqueous vinyl urethane resin. The configurations of the secondary lamina 22 and the secondary lamina 23 are the same as the configuration of the secondary lamina 21.

  In the laminated material 20 configured as described above, the primary lamina is bonded so that the fiber directions of the grains of the primary lamina are orthogonal to each other. As described above, the value of the dimensional change rate of each primary lamina is 2%. Since it is as small as below (see Table 1) and has the same degree in the thickness, width and length directions, it does not cause warpage or twist.

  Moreover, the design property of the part joined so that the fiber direction of the grain of these primary lamina may orthogonally cross is high, and it can be used so that this part may appear on the surface.

  Therefore, in the second embodiment, since the dimensional change rate due to the change in the moisture content of the primary lamina is small, the fiber directions of the primary lamina grain can be crossed and joined, and a deviation such as warping or twisting occurs. In addition, there is no stickiness of the surface due to the residue of unreacted material, and a hard surface is formed, so that the surface of the wooden material is not easily scratched, and further, discoloration such as yellowing due to light is greatly improved, and The laminated material having high commercial value can be provided by the high design property of the cross-joined portion.

10, 20 ... Glulam, 11-13, 21-23 ... Secondary lamina,
11a-11c, 21a-21c ... primary lamina,
14a, 14b, 24a, 24b ... Junction site.

Claims (9)

A first component comprising an addition product of 2-imidazolidinone and glyoxal;
Impregnating a woody material with a treatment liquid containing a second component composed of 4,5-dihydroxy-2-imidazolidinone or a derivative thereof;
A method for treating a wood material, characterized in that the first component and the second component are reaction-cured in the wood material. In addition to the first component and the second component, a wood material is impregnated with a treatment liquid containing a third component made of glycols,
2. The method for treating a woody material according to claim 1, wherein the third component is reacted and cured together with the first component and the second component in the woody material. 3. The method for treating a woody material according to claim 1 , wherein the first component is formed by adding 0.9 mol to 1.2 mol of glyoxal to 1 mol of 2 -imidazolidinone. The second component is
1,3-dimethyl-4,5-dihydroxy-2-imidazolidinone, 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone, 1,3-bis (hydroxyethyl)- 4. The method for treating a woody material according to claim 1, comprising at least one selected from the group consisting of 4,5-dihydroxy-2-imidazolidinone. 5. A first component comprising an addition product obtained by adding 0.9 mol to 1.2 mol of glyoxal to 1 mol of 2-imidazolidinone;
A second component consisting of 1,3-bis (hydroxyethyl) -4,5-dihydroxy-2-imidazolidinone,
When these contents are solid content ratio (weight ratio) and the first component is 1, the wood material is impregnated with a treatment liquid in which the second component is in the range of 3-6,
A method for treating a wood material, characterized in that the first component and the second component are reaction-cured in the wood material. A first component comprising an addition product obtained by adding 0.9 mol to 1.2 mol of glyoxal to 1 mol of 2-imidazolidinone;
A second component comprising 1,3-bis (hydroxymethyl) -4,5-dihydroxy-2-imidazolidinone;
A third component comprising dipropylene glycol,
When these contents are solid content ratios (weight ratio) and the first component is 1, the second component is in the range of 3 to 6, and the third component is in the range of 2.5 to 5.5. Impregnating the woody material with the processing solution inside,
A method for treating a wood material, characterized in that the first component, the second component, and the third component are reactively cured in the wood material. A first component comprising an addition product of 2-imidazolidinone and glyoxal;
A wood material, characterized in that a treatment liquid containing a second component composed of 4,5-dihydroxy-2-imidazolidinone or a derivative thereof is reaction-cured in a wood material. In the laminated lumber formed by stripping or / and laminating the secondary lamina formed by cascading the primary lamina made of the wood material according to claim 7,
The laminated laminar is characterized in that the secondary lamina has a longitudinal joint portion so that fiber directions of the grain of the primary lamina intersect each other. In the laminated lumber formed by cascading or / and separating the secondary lamina formed by laminating the primary lamina made of the woody material according to claim 7,
The laminated laminar is characterized in that the secondary lamina has a laminated portion joined so that fiber directions of the grain of the primary lamina intersect each other.