JPS60260303A - Manufacture of aggregate decorative 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 (Technical Field) The present invention relates to a technology for producing a laminated veneer in which the wood grain is artificially reproduced by assembling the entire wood veneer.

(Background technology) Wood veneers conventionally used as veneers for furniture or walls have the following drawbacks! (a) Discoloration and cracks on the painted surface (b) Cracks during processing These defects are caused by the tensile properties of the veneer, dimensional changes, the amount of paint absorbed, etc.

In recent years, the use of artificially decorated veneers has increased, and the above-mentioned drawbacks are more common in artificially decorated veneers than in natural veneers.

Artificial decorative veneer is made by turning low-grade wood (mostly South Sea wood) into a rainbow veneer with rotary lace, etc., then bleaching or dyeing it, conditioning the humidity, and then laminating and crimping it with an adhesive. After manufacturing, the entire sliced veneer (thickness 0.3-0.5mm) is prepared.

Therefore, when using materials with these defects as surfacing materials, methods such as increasing the number of claddings or pasting reinforcing materials such as paper on the back side of the veneer are used. It had drawbacks such as large cracks due to bending, and high costs for painting and reinforcing.

Therefore, a resin or the like is applied to the surface of the laminated decorative veneer and cured. Alternatively, methods such as pasting a transparent sheet 1 have been proposed, but in either method, a resin layer exists on the surface of the veneer, and the original wood texture is lost. It has the disadvantage that it cannot be colored.

(Purpose of the Invention) The present invention was proposed to improve the above-mentioned drawbacks, and in the laminated decorative veneer, (a) reduces the suction of paint, (b) prevents grain discoloration and cracks, and improves the wood texture. The object of the present invention is to improve the veneer without causing any damage, and (c) to provide a treated veneer with a good surface condition.

(Disclosure of invention) Next, the present invention will be explained in detail.

The present invention involves coating a pre-prepared laminated veneer with multi-isocyanates, or their polymers, oligomers, etc. (hereinafter referred to as isocyanate special), and then subjecting them to an impregnating treatment and foaming and hardening them by exposing them to 2 heated steam. It is characterized by

Pre-prepared laminated veneer is impregnated with 10 to 40% by weight of polyhydric alcohol (e.g., polyethylene glycol, polyglopylene glycol, ethylene glycol, etc.), and then simultaneously impregnated with polyhydric alcohol or laminated. Simultaneously with the veneer, it is impregnated with a urethane curing catalyst (metallized objects such as tin salts, organotin compounds, tertiary amines, etc.) at 0.1 to 1% (parts by weight of incyanate). .

In the present invention, the point specially devised to finish the laminated veneer in a good condition is that the multi-isocyanate applied
It is impregnated into the veneer and then cured with heated steam.

If a multi-isocyanate is applied to a laminated veneer and then cured by heating and steam, a foam layer will be formed on the surface of the laminated veneer, and the finished veneer will need to be sanded.
This is because thin product veneers are very difficult to sand.

No foam layer is formed on the surface of the product veneer when it is impregnated or foamed and cured.

The method of impregnation is arbitrary, but it may be heated or soaked for 30 minutes after application.
It may be determined as appropriate depending on the properties of the coated material, such as allowing it to stand for 60 minutes.

The polyisocyanates used are 2,4 tolylene diisocyanate (TDI), 4,4' diphenylmethane diisocyanate (MDI), and crude MDI (MDI 1 to 4).
n-mer), hydraulic urethane resin, etc., and may be used alone, or may be used by appropriately mixing a polymer and a monomer.

(Example-1) Rotary veneer made of hardwood Iras material (thickness 1.0
mm ) f, P f (= 9.5 ao*, density 2
weight%.

The following tests were conducted using materials bleached at a temperature of 70°C.

Polyethylene glycol (average molecule (i 1500 )
60% by weight, dye Nisminol, Milling Brown 3
G (manufactured by Sumitomo Chemical Co., Ltd.) was coated with 3001β on a veneer that had been conditioned to a 1% by weight aqueous solution of gold and a water hydration rate of 40%, and was treated in moist heat at 100°C for 3 hours. , the humidity was adjusted to 30±5 cm, and a flitch was obtained by pressing with a concave-convex mold using a urethane adhesive. The flitch was sliced to a thickness of 0.3 mm using a slicer to obtain a laminated veneer.

Add stannic chloride to the veneer in ethyl acetate at 0.5h b
Apply the dissolved solution of 107β, then crew)'
MDI 30μ and 50t/rr? k, respectively applied and left at room temperature (25°C) for 60 minutes and 120 minutes,
After confirming that the coating substance had penetrated into the veneer from the surface of each laminated veneer, the temperature was heated to 100°C.

The foam was cured in an oven at a humidity of 90±5 degrees for 3 minutes.

The treated veneer of the 2'$ri class and the veneer without surface treatment were respectively adhered to the JASn class plywood using an adhesive, and the following tests were conducted.

After polishing with 180# sandpaper, it was polished with a 30#f sandpaper. Next, general urethane coating for furniture (
Urethane sealer → urethane intermediate coating → urethane flat) Polyester painting (urethane sealer 2 times → polyester intermediate coating → urethane flat) caused discoloration and cracks.

Paint absorption was evaluated. Cracking was performed by JAS cold and hot repetition test. The results are shown in Table 1.

Table 1 (Example-2) In implementation flJ1, a curing catalyst (stannic chloride dissolved in acetic acid ester) was applied.

After conditioning the laminated veneer to a moisture content of 5% or less, a mixture of 4,4-diphenylntane diisocyaner (MDI) and polyurethane resin (PV) was applied at 252°C, and the same foaming and curing treatment as in Example 1 was applied. The discoloration, cracks, and amount of paint absorbed were measured in the same manner. MDI/PV mixing ratio -1
/1.

I did it in 1/3.

The results are shown in Table 2.

Table 2 (Example-3) The two types of veneer metals coated in Example 2 were heated at 90°C for 3 minutes immediately after coating to impregnate the coating material into the veneer.
The same test as in Example 1 was carried out by foaming and curing in the same manner, and the results are shown in Table 3. &・ 1 @Table 3 (Comparative Example-1) Table 4 shows a comparison of the surface conditions of the treated veneers that were cured under the same conditions 5 minutes after application of crude MDI in Example 1.

@Table 4 (Effects of the Invention) According to the rC invention as described above, the laminated veneer is impregnated with a multi-isocyanate applied before foaming and curing, and the veneer is impregnated before the laminated veneer is formed. By performing polyhydric alcohol treatment and using a curing catalyst, it is possible to create a layered color without losing the good wood texture of the surface.
It has the effect of producing a laminated veneer with good coating performance.

Patent applicant: Matsushita Electric Works Co., Ltd. Procedure correction disease (voluntary) December 3, 1980 Director of the Patent Office Manabu Shiga Indication of the Lord's case 1981 Patent application No. '116635 2, title of invention Laminated decorative veneer Manufacturing process 3, relationship with the case of the person making the amendment Patent applicant name (583) Matsushita Electric Works Co., Ltd. 4, agent 160 Address No. 2 Mizotabino Shiding 7, 7-5-10 Nishi-Shinjuku, Shinjuku-ku, Tokyo Floor 5, Subject of amendment Column 66 of "Detailed description of the invention" in Mei 1B Book Contents of amendment (1) "At the same time as the molding plate" in the month line of page 4 of Mei 4118 was changed to "at the time of molding the molding plate" I am corrected.

(2) Correct "1 Irus material" in the 17th line of the 5th true to "Aius material".

Claims (2)

[Claims] (1) Layer multiple wood veneers with purple adhesive in between, press them using a mold with uneven curved surfaces to make a complete flitch, and slice this flitch to produce laminated decorative veneers. , polyols were added to the wood veneer in advance.
A method for producing a laminated decorative veneer, which is characterized in that the laminated decorative veneer is impregnated with an amount of O to 40M (percentage percent), and then a multi-isocyanate is applied and impregnated to the laminated decorative veneer, and after the coating and impregnation, the laminated decorative veneer is heated and cured in water vapor. (2) The scope of patent claims in which a wood veneer is impregnated with polyols and a urethane curing catalyst, and then a multi-isocyanate is coated and impregnated on a laminated decorative veneer, and then heated and cured in steam. A method for manufacturing a laminated decorative veneer according to item 1.