JPS63293004A - Improved wood and manufacture thereof - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides WPC (Wood PC) using epoxy resin.
The present invention relates to improved wood treated with Plastic Combination and a method for producing the same.

[Background technology]

Recently, it has been proposed to impregnate wood with a thermoplastic resin and subject it to WPC treatment. This method improves the water resistance and dimensional stability of the wood by impregnating it with thermoplastic resin, and has the advantage that the wood texture is not impaired. It has the disadvantage of being inferior.

On the other hand, WPC involves impregnating wood with a condensation resin liquid such as unsaturated polyester resin and then heating it to harden the resin.
Processing is also known. In such WPC treatment, heat resistance,
Water resistance, hot water resistance, etc. are improved, but there is a drawback that the wood becomes plastic and the original wood texture is lost. Furthermore, since radical curing resins are inhibited from polymerization by oxygen in the air, there is a problem in that the curing reaction does not proceed when exposed to the air.

[Purpose of the invention]

An object of the present invention is to provide an improved lumber that has excellent heat resistance, water resistance, and hot water resistance, has a woody texture, and has excellent productivity, and a method for producing the same.

[Disclosure of the invention]

The improved wood of this invention is obtained by dispersing and curing an epoxy resin composition containing an epoxy resin and an organic polybasic acid anhydride as main components in wood.

In other words, the improved wood of the present invention has excellent heat resistance, water resistance, and hot water resistance without impairing the wood texture by impregnating the wood with a specific epoxy resin composition and sufficiently dispersing and curing it. It also has excellent productivity due to its fast curing speed.

Further, the method for producing improved wood of the present invention includes a step of creating an impregnating liquid by dissolving an epoxy resin composition containing an epoxy resin and an organic polybasic acid anhydride as main components in an organic solvent, and applying the impregnating liquid to the wood. and a step of curing the epoxy resin by evaporating the organic solvent from the impregnating liquid.

According to the method of the present invention, the epoxy resin composition is dissolved in an organic solvent to create an impregnating liquid, and the wood is impregnated with this. It increases the impregnation and permeability inside the wood, making it more effective in maintaining the wood texture of the wood.

The main constituent materials (epoxy resin, curing agent) that make up the epoxy resin composition have excellent weather resistance and durability without whitening or discoloration during use, and they volatilize together with the solvent during the solvent volatilization after impregnation into wood. It is preferable to have low volatility so as not to damage the wood, and also to have an appropriate curing speed and pot life.
Proceed as follows, and in the state of the impregnating solution with a solvent added, at room temperature 1! ! It is desirable that it maintains stability for one hour or more.

Examples of epoxy resins that satisfy these conditions include alicyclic (or cycloaliphatic) epoxy resins, hydantoin-type epoxy resins, triglycidyl isocyanunate, and aromatic epoxy resins.

Examples of the alicyclic epoxy resin include compounds having a cyclohexene oxide group, tricyclodecene oxide group, cyclopentene oxide group, etc., as well as epoxy compounds having a structure in which the aromatic ring of an aromatic epoxy compound is hydrogenated, such as diglycidyl hexahydro. Phthalate, diglycidyl cyclohexane 1,3-dicarboxylate (cis or trans form), diglycidyl cyclohexane 1,4-dicarboxylate (cis or trans form), and "Recaresin HBEJ" manufactured by Shin Nippon Chemical ■
etc. can be mentioned.

Examples of the hydantoin type epoxy resin include diglycidylhydantoin, glycidylglycidoxyalkylhydantoin, and the like. The triglycidyl isocyanunate can be produced by, for example, reacting triallylisocyanurate with hypochlorous acid to obtain a trichlorohydrin intermediate, and removing hydrogen chloride from this intermediate with an alkali to glycidylate it, or cyanuric acid. A trichlorohydrin intermediate is obtained by reacting an acid with epichlorohydrin, and from this, hydrogen chloride is removed and glycidylated in the same manner as described above. Furthermore, rDenacol EX301J (triglycidyl tris isocyanurate) manufactured by Nagase Kasei ■ can also be used.

Further, examples of the aromatic epoxy resin include bisphenol A epoxy resin, novolak epoxy resin, bisphenol F epoxy resin, and brominated epoxy resin.

However, it is not appropriate to use aromatic epoxy resin alone from the viewpoint of weather resistance, and it is preferable to use it in combination with alicyclic epoxy resin, etc. Also, as an epoxy resin other than the above, Nagase "Bunacol EX21" made by Kasei ■
1J (neopentyl glycol diglycidyl ether), ``Bunacol EX231J (spiroglycol diglycidyl ether), ``Bunacol EX314J
(glycerol polyglycidyl ether), “Bunacol EX321J ()rimethylolbroban polyglycidyl ether), rXB2869 manufactured by Ciba” (
Hindatoin epoxy compound) etc. can also be used.

As the organic polybasic acid anhydride used as the curing agent, it is preferable to use one that has a suitably fast curing speed and excellent weather resistance. For example, alicyclic or aliphatic acid anhydrides are preferred. can give.

Specifically, methyltetrahydrophthalic anhydride, tetrahydrophthalic anhydride, nadic anhydride, methylnadic anhydride, hexahydrophthalic anhydride, and 4-methylhexahydrophthalic anhydride, which have been conventionally used as curing agents for epoxy resins. , 3-methylhexahydrophthalic anhydride, 4'-(4-methyl-3-pentenyl)tetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, maleated fatty acid, dodecenyl succinic anhydride, vinyl ether-maleic anhydride Polymers, alkyl styrene-maleic anhydride copolymers, methylcyclohexenetetracarboxylic anhydride, succinic anhydride, and alkenyl succinic anhydride (e.g. dodecenyl succinic anhydride) obtained by the ene reaction of olefin and maleic anhydride. Available for use. Furthermore, among other acid anhydrides used as hardening agents, halogenated acid anhydrides (for example, chlorendic anhydride, etc.) are suitable for imparting flame retardancy to improved wood. In addition, aromatic acid anhydrides (phthalic anhydride,
Although trimellitic anhydride (such as trimellitic anhydride) has excellent heat deformation resistance and chemical resistance, it has the disadvantage of poor weather resistance, so it is not appropriate to use it as a main component, and it is appropriate to use it in combination with other curing agents. It is.

A curing accelerator is added to accelerate the reaction between the epoxy resin and the acid anhydride. Examples of the curing accelerator include tertiary amines, phosphines, imidazoles, carboxylic acid metal salts, and the like. Examples of the tertiary amine include "rDBU" manufactured by Sun Abbott and rUCAT SAI 0.
In addition to 2J (DBU2 ethylhexanoate), 2,
4.6- )su(dimethylaminomethyl)phenol (
Examples include "DMP30" manufactured by Rohl Hase, "SumiCure DJ etc." manufactured by Sumitomo Chemical Industries, Ltd., and benzyldimethylamine (BDMA). Examples of the phosphine include triphenylphosphine, ethyltriphenylphosphonium bromide, etc. can be given.

As imidazoles, for example, 2-ethyl-4-methylimidazole (r2E4MZJ, 1 manufactured by Shikoku Kasei)
-isobutyl-2-methylimidazole (rlBM-12 manufactured by Yuka Shell Epoxy ■), 1-benzyl-2-
Methylimidazole (rlB2MZJ manufactured by Shikoku Kasei)
etc. can be mentioned.

The blending ratio of the epoxy resin, curing agent, and curing accelerator may be within the commonly used blending range.

In addition, it is necessary to use an organic solvent that has an affinity for the wood structure, such as alcohol If (methanol, ethanol, isopropanol, etc.), ketones (acetone, methyl ethyl ketone, etc.), ester 11, etc. (methyl acetate, ethyl acetate, etc.), ether M
(isopropyl ether, tetrahydrofuran, dioxane, etc.), halogenated hydrocarbons (methylene chloride, chloroform, etc.) and other organic solvents. These organic solvents can be used alone or in combination of two or more, and may also be used in combination with hydrocarbon solvents such as cyclohexane and toluene. It is preferable to use one with a boiling point of 100°C or less because it has excellent dissolving power for the accelerator, can form a homogeneous solution, and can easily volatilize the solvent after impregnating the wood. The concentrations of the epoxy resin, curing agent, and curing accelerator can be appropriately determined based on the resin inclusion property, workability, etc., and are not particularly limited.

In addition, in order to prevent coloration during and after curing of the epoxy resin, a stabilizer may be added to the impregnating liquid. Examples of the stabilizer include organic tin compounds, organic sulfur compounds, benzophenone compounds, and hydroquinone compounds. compounds, phenolic compounds, amine compounds, phenyl salicylate compounds, and the like.

The wood to be impregnated with the impregnating liquid includes tree species such as toga, pine, and cypress. As the impregnation method, in addition to the normal pressure immersion method in which the wood is immersed in the impregnating solution under normal pressure, the reduced pressure normal pressure method or the reduced pressure pressure method in which the wood is immersed under reduced pressure and then immersed under normal pressure or increased pressure can be adopted. It is determined as appropriate depending on the amount of impregnation, the type of wood, etc. The amount of epoxy resin etc. to be impregnated can be determined as appropriate within a range that increases the hardness, water resistance, heat resistance, and hot water resistance of the wood, and does not impair the wood's original texture and texture. Regarding the hardness, it is preferable that the Percoll hardness is 40 or less in order to maintain a woody feel.

After impregnation, the wood is dried to volatilize the solvent, and the resin is cured by heating or the like. In addition to air drying, forced drying using warm air or hot air, and vacuum drying under reduced pressure can be used to volatilize the solvent. In forced drying, the main components are gradually vaporized along with the solvent to avoid continuous loss. It is preferable to do so.

The improved wood obtained in this way has high water resistance, heat resistance, and hot water resistance because the epoxy resin is cured in the wood, and has a woody feel and moderate hardening speed. In addition, in the method of this invention, the main components such as epoxy resin are dissolved in an organic solvent and impregnated into the wood, so the permeability of these components in the wood is reduced. Higher dispersibility. In this case, when impregnating with epoxy resin etc. without using an organic solvent, the wood texture may be damaged, and the pot life of the resin is short, so the epoxy resin and hardening agent should be separated and impregnated in stages. There is a drawback that it must be done.

Furthermore, in this invention, since the epoxy resin reacts with the hydroxyl group in the epoxy resin wood component, there is also the advantage that the adhesiveness between the cured product and the wood structure is increased.

Next, the improved wood of the present invention and its manufacturing method will be explained with reference to Examples.

Example 1: An impregnation liquid having the following composition was prepared.

(Ingredients) (Amount) Alicyclic epoxy resin 70.0 g ("Celoxide 2021J" manufactured by Daicel Chemical ■) Alicyclic acid anhydride 78.2 g ("Epicron B650J" manufactured by Dainippon Ink ■) Curing acceleration Agent (bicyclic tertiary amine > 2.0 g (rUcAT 5A102J manufactured by Sun Abbott) Hardening accelerator 0.7 g (ethylene glycol) Organic solvent (acetone) 590.0 g As wood, Japanese tomato, Japanese pine, Japanese pine, Use Taiwanese cypress with a specific gravity of 0
．． 4) 10 pieces of each were prepared in a size of 15cm x 15cm x 8cm and impregnated with the above impregnating solution. After impregnation, air dry at night, 1 hour at 80°C, 13
The wood was cured by heating at 0° C. for 3 hours to obtain improved wood.

Example 2: Improved wood was obtained in the same manner as in Example 1, except that an impregnation solution having the following composition was prepared.

(Ingredients) (Amount) Alicyclic epoxy resin 100.0 g ("Recaresin I (BEJ" manufactured by New Japan Chemical) Alicyclic acid anhydride 62.0 g ("Epiclon B570J" manufactured by Dainippon Ink) Hardening accelerator (imidazole) 3.0 g (rlBMI-12J manufactured by Yuka Shell Epoxy ■) Organic solvent (methanol) 500.0 g Example 3: An impregnating solution having the following composition was prepared.

(Ingredients) (Amount) Aromatic epoxy resin i o o, o g ("Epicort 828J" manufactured by Yuka Shell Epoxy ■) Alicyclic acid anhydride 81.0 g ("Epicron B650J" manufactured by Dainippon Ink ■) Curing accelerator (bicyclic tertiary amine) 3.0 g (rUCAT 5A102J manufactured by Sun Abbott) Organic solvent (acetone) 720.0 g The same wood as in Example 1 was used, and the above impregnation solution was added to it. After the impregnation, the wood was air-dried overnight and heated at 80° C. for 1 hour and at 130° C. for 2 hours to harden, thereby obtaining an improved wood.

The improved wood obtained in each example had excellent weather resistance, water resistance, heat resistance, and hot water resistance, high hardness, and retained its original wood texture.

〔Effect of the invention〕

The improved wood of this invention has a specific epoxy resin composition impregnated into the wood and dispersed and cured, so it has excellent heat resistance, water resistance, and hot water resistance without impairing the wood texture, and has an appropriate curing speed. Therefore, productivity is also excellent.

Furthermore, according to the method of the present invention, the epoxy resin composition is dissolved in an organic solvent to prepare an impregnating liquid, and the impregnating liquid is impregnated into the wood. Impregnating property of epoxy resin inside wood,
It increases permeability and is more effective in preserving the wood texture of wood.

Eni[)B+1g"=t: 1 Proceeding principal's letter (spontaneous) 1. Hanyu's Goin Patent Application No. 130309 1962 3. Person making the amendment Relationship with Hanyu Applicant 4, Agent 5, Amendment Voluntary amendment to the date of the instruction (1) On page 2, line 19 of the specification, "condensation type" is corrected to "thermosetting type."

(2) On page 4, line 15 of the specification, add ``katsu'' after ``taka,''.

(3) In the first line of page 7 of the specification, the phrase "weather resistant" is corrected to "weather resistant for applications that require a high degree of weather resistance, such as exterior materials."

(4) On page 8, line 19 of the specification, add ``for use as an exterior material'' after ``because of''.

(5) Specification, page 1O, lines 5-6, “Alcohols...
...isoproper tools, etc.),".

(6) From page 10, line 19 to page 11, line 2 of the specification, ``Not for organic solvents'' is deleted.

(6) From page 11, line 19 to page 12, line 1 of the specification, the phrase ``preferable for hardness...'' has been replaced with ``the amount of resin impregnated that does not affect the wood texture has been determined based on the results of numerous studies. , can be expressed as follows.In other words, when the resin impregnation rate is 100% when the voids in the wood are completely filled, if the resin impregnation rate is 2 to 80%, the improved wood has a high wood feel. If the resin impregnation rate exceeds 80%, the wood texture will deteriorate, and if it is less than 2%, the wood improvement effect will be reduced.''

(7) On page 14, line 19 of the specification, "methanol" is corrected to "acetone."

(8) On page 16, line 9 of the specification, add ``katsu'' after ``taka,''.

Claims (6)

[Claims] (1) Improved wood obtained by dispersing and curing an epoxy resin composition containing an epoxy resin and an organic polybasic acid anhydride as main components in wood. (2) The epoxy resin is one or more selected from the group consisting of alicyclic epoxy resin, hydantoin type epoxy resin, triglycidyl isocyanurate, and aromatic epoxy resin. ) Improved wood as described in section. (3) Claim No. 1, wherein the epoxy resin is a mixture of an alicyclic epoxy resin and an aromatic epoxy resin.
) Improved wood as described in section. (4) The improved wood according to claim (1), which is obtained by adding a curing accelerator to the epoxy resin composition. (5) The organic polybasic acid anhydride is an alicyclic acid anhydride,
The improved wood according to claim (1), which is an aliphatic acid anhydride or a mixture thereof. (6) A step of dissolving an epoxy resin composition containing an epoxy resin and an organic polybasic acid anhydride as main components in an organic solvent to create an impregnation solution, a step of impregnating wood with the impregnation solution, and a step of impregnating the wood with the impregnation solution. A method for producing improved wood comprising the step of evaporating the organic solvent from the impregnating liquid and curing the epoxy resin.