JPS6221503A - Manufacture of reinforced veneer - 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 [Field of Industrial Application] The present invention relates to a reinforced veneer used for building materials, furniture materials, etc.

[Prior art and its problems]

Conventionally, there are a wide variety of methods for manufacturing reinforced wood veneers by impregnating wood veneers with synthetic resins using vacuum impregnation or pressure impregnation.
It is being done.

However, this conventional method has disadvantages in that impregnation of the resin into the wood veneer is uneven, making it impossible to obtain a homogeneous reinforced veneer, and it takes time to impregnate the wood veneer with the resin.

[Means for solving problems]

The present invention uses a method of pre-treating wooden veneers for reinforced veneers with a hydrophilic solvent, thereby making it easier to impregnate wooden veneers with synthetic resins, etc., and solving the problems in the resin technology described above. It is something.

The present invention is a method for producing a reinforced veneer, which is characterized in that the wood veneer is pretreated with a hydrophilic solvent, then impregnated with a synthetic resin or oil and fat, and then cured by an appropriate means.

The hydrophilic solvent used for pretreatment is methanol (boiling point 64.
65°C), ethanol (boiling point 78.3°C), acetone (boiling point 56.5°C), isopropyl alcohol (boiling point 9
7.4℃) etc. The solvent preferably has a solubility in water of 10 g or more per 100 g of water, and the boiling point of the solvent is less than 100°C.

Pretreatment with these hydrophilic solvents can be carried out by immersing the car plate in the solvent for 1 hour to 1 day at a temperature from room temperature to 50°C. The pretreatment of the present invention is
By replacing the water contained in the veneer with a solvent, it can be easily replaced during impregnation with synthetic resin, etc. Furthermore, since the solvent has the function of swelling the wood structure, it prevents resin etc. from entering the wood structure. Furthermore, the solvent also has the effect of preventing uneven hardening of the resin by eluting or diffusing substances originally contained in the wood that inhibit the polymerization of the resin.

After pretreatment with a solvent in this way, a step of squeezing out excess solvent with a squeezing roll may be added.

Also, after this pretreatment, 50 °C at 50 to 110 °C
A drying step of about 60 minutes may be included.

Drying can improve thermal efficiency during resin impregnation. The moisture content in the veneer does not need to be 0%. Although this treatment reduces the effect of facilitating the replacement of the resin with the solvent (it does not completely eliminate it as some solvent remains), the effect of preventing the polymerization inhibiting substance from acting remains the same.

Usable veneer resins include oak, toga, pine, birch, etc., and the thickness of the veneer is usually 0.3 to 1.0 yen, but is not limited to this thickness. .

The synthetic resins used in the present invention include alkyd resins, epoxy resins, polybutadiene resins, urethane resins, unsaturated polyester resins, acrylate resins, diallyl phthalate resins, etc., and the oils and fats include linseed oil, Refers to boiled oil, etc. Naturally, the synthetic resin includes a two-component synthetic resin, and specific examples include the following combinations.

Epoxy resin: A liquid containing an epoxy resin liquid and a curing agent (ethylene diamine), etc.Polybutadiene resin: A liquid containing a polybutadiene resin liquid and a catalyst (benzoyl peroxide), etc.Urethane resin: Acrylic polyol or polyamine or polyester polyol and curing agent (TD'I
・Liquid unsaturated polyester resin containing MD I -H'MD I) etc...Liquid acrylate resin containing unsaturated polyester resin and catalyst (benzoyl peroxide, dicumyl peroxide) etc...Epoxy'acrylate A reactive diluent (methyl methacrylate, methyl acrylate, ethyl acrylate, butyl methacrylate) may be added to the liquid containing an initiator (acetyl peroxide) and the like.

Diallyl phthalate resin... Diallyl phthalate resin liquid and catalyst (benzoyl peroxide tertiary)
Butyl peroxide, tert-butyl peracetite), etc., and the synthetic resins or oils to be impregnated into the wood veneer can be heated to a temperature above the boiling point of the solvent prior to impregnation, to reduce their viscosity. Moreover, the wood veneer is heated during impregnation, which softens the wood structure and makes it easier for the solvent and air in the wood veneer to escape to the outside.
As a result, synthetic resin liquid and the like become easily impregnated into the wood veneer. When the heating temperature of the resin or the like is set to 100° C. or higher, the water remaining in the wood veneer easily evaporates and is easily replaced with synthetic resin liquid, etc., which is an advantage.

The wood veneer thus impregnated with synthetic resin or oil is then cured by appropriate means. Possible curing methods include a method of leaving it as is, a method of accelerating curing by heating, and a method of using ultraviolet rays or electron beams.

Note that a dryer, a hot roll press, or a flat plate hot press may be used for heating.

Example 1 A 0.8 mm + thick Japanese pine veneer was immersed in a 100% methanol solution for 2 hours at room temperature, then taken out, and placed under reduced pressure in a resin solution containing 100 parts by weight of unsaturated polyester resin and 1 part by weight of hensyl peroxide. After soaking in water for 2 hours, this wood veneer was placed on the surface of a 12 mm thick plywood board using a urethane adhesive, and heat-pressed at 130°C and 8 kg/cJ for 5 minutes to form an unsaturated polyester. Adhesion was completed at the same time as the resin was cured, and the desired reinforced veneer-bonded decorative board was obtained.

Example 2 Example 1 except that instead of immersing the Japanese pine veneer in the unsaturated polyester resin liquid of Example 1 for 2 hours under reduced pressure, the Japanese pine veneer was immersed in the unsaturated polyester resin liquid at 110°C for 2 minutes. In the same manner as above, a desired reinforced veneer-bonded decorative board was obtained.

Example 3 An 11-thick oak veneer was immersed in a 90% ethanol aqueous solution at 50° C. for 5 hours and then taken out. After squeezing out the excess aqueous solution, it was dried at 90° C. for 5 minutes.

After impregnating the above oak veneer with the unsaturated polyester resin under reduced pressure for 2 hours, 100 parts by weight of the same unsaturated polyester resin, 1-80 parts by weight of methyl methacrylate, 10 parts by weight of dicumyl peroxide, and 60 parts by weight of methyl isobutyl ketone were added. It was immersed in the same solution for 2 hours. This wood veneer is heated to 130°C1
The desired reinforced veneer was obtained by hot pressing at 8 kg/cJ for 5 minutes.

Example 4 Example 3 except that instead of impregnating the oak veneer with the unsaturated polyester resin of Example 3 under reduced pressure for 2 hours, the oak veneer was immersed in the unsaturated polyester resin solution at 110°C for 2 minutes.
A desired reinforced veneer was obtained in the same manner as above.

Example 5 An 11-thick Japanese pine veneer was immersed in a 100% acetone solution for 1 hour at room temperature, then taken out, the excess liquid was squeezed out, and this was immersed in an epoxy acrylate resin solution under reduced pressure for 40 minutes, followed by acetyl veneer. , 8 parts by weight of peroxide, 100 parts by weight of methyl methacrylate, and 40 parts by weight of ethyl acrylate for 1 hour. Next, use this rice pine veneer for 90
The desired reinforced veneer was obtained by drying at ℃ for 4 hours.

Example 6 The Evogashi acrylate resin of Example 5 was applied to a Japanese pine veneer for 40 minutes.
A desired reinforced veneer was obtained in the same manner as in Example 5, except that the Japanese pine veneer was immersed in an epoxy acrylate resin solution at 120° C. for 40 seconds instead of being impregnated under reduced pressure.

Example 7 The solvent-treated veneer used in Example 1 was immersed in an epoxy resin (trade name: Epicoat 828) solution at 120°C for 30 seconds, the excess liquid was removed, and 100 parts by weight of ethylenediamine was applied to both sides of the veneer. Apply 80g/rd of a solution containing 100 parts by weight of methyl ethyl ketone, leave for 4 hours, and then heat to 80°C.
After drying for 3 hours, a desired reinforced veneer was obtained.

Example 8 A 0.6 mm thick cover veneer which had been immersed in a 100% isopropyl alcohol solution at 40°C for 12 hours and the excess liquid removed was treated with 100 parts by weight of TDI block isocyanate at 110°C and 100 parts by weight of ethylene glycol dimethyl ether acetate. After soaking in the solution for 2 minutes, remove the excess solution, and then soak in polypropylene glycol 10.
0 parts by weight and 150 parts by weight of ethylene glycol dimethyl ether acetate for 7 hours. then 100
Dry for 2 hours at 160°C, followed by 18kg/c
A desired reinforced veneer was obtained by hot pressing for 10 minutes.

Example 9 Three solvent-treated veneers used in Example 1 were added to a linseed oil solution.
After being immersed for 0 minutes, it was taken out from the solution and left to stand at room temperature to obtain a desired reinforced veneer.

Example 10 Instead of soaking the veneer in the linseed oil liquid for 30 minutes as in Example 9, the veneer was soaked in the linseed oil liquid heated to 160°C for 30 minutes.
A desired reinforced veneer was obtained in the same manner as in Example 9 except that the veneer was immersed for a second.

Example 11 In an acrylic ultraviolet curable resin liquid heated to 120°C,
The solvent-treated veneer used in Example 1 was immersed for 20 seconds, then taken out from the solution, and irradiated on both sides with an ultraviolet lamp with an output of 160 W/cm for 3 seconds to obtain a desired reinforced veneer.

〔Effect of the invention〕

The present invention uses a process of pre-treating the wood veneer with a hydrophilic solvent to facilitate impregnation of the wood veneer with synthetic resin, etc., and enables even resin impregnation, resulting in homogeneous and A high-quality reinforced veneer can be obtained, and furthermore, if this resin is heated to a temperature higher than the boiling point of the solvent before impregnation, remarkable effects such as a significant improvement in impregnation efficiency can be achieved.

Claims (2)

[Claims] (1) A method for producing a reinforced veneer, which comprises pretreating a wood veneer with a hydrophilic solvent, impregnating it with a synthetic resin or oil, and curing it by an appropriate means. (2) The method for producing a reinforced veneer according to claim 1, wherein the synthetic resin or oil or fat to be impregnated into the wood veneer is heated in advance to a temperature higher than the boiling point of the hydrophilic solvent.