JPS6271607A - Manufacture of colored wood impregnated with synthetic resin - 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 is a technology related to WPC, which is one of wood modification methods.

(Background technology J) Conventional methods for coloring wood include chemical coloring, dyeing, etc. Also, as a method for coloring synthetic resin-impregnated wood, coloring agents such as dyes and pigments are added to the synthetic resin injected into the wood. There is a method of obtaining colored wood impregnated with synthetic resin.

However, the above method had the following drawbacks.

■ Even if chemical coloring or dyeing treatment is performed, the entire body will be of the same color tone, making it difficult to make only the target vessel part a dark color.

■ When colored synthetic resin is used, the vessel becomes dark colored, but there are restrictions on the types of resin that can be colored. (The type of coloring is determined by the number of tanks in which the synthetic resin is stored.) Also, when changing the colored synthetic resin, the previous color must be removed if the resin from the internal piping of the vacuum cooker is not sufficiently removed. There is also a risk of confusion.

That is, although such a method is suitable for high-volume, low-variety production, it poses a problem for low-volume, high-variety production.

(Object of the Invention) In the present invention, first, the entire wood is colored with a reactive coloring liquid to a target color tone. Incidentally, the coloring treatment is carried out by dipping or coating in a reactive coloring liquid.

Next, the colored wood is subjected to conventional vacuum and pressure methods.
'1. Inject and impregnate the synthetic resin and semi-cure the synthetic resin with hot air.

Next, a coloring agent such as a dye or pigment is applied to the surface of the wood, and the coloring agent is embedded in the vessel portion, and then a clear synthetic resin is applied and hardened using a hot pressure press. As a result, the objective is to obtain colored wood impregnated with a synthetic resin in which the vessel portion of the hardwood is darkened and the grain of the wood is emphasized.

(Structure of the invention) An outline of the steps of the manufacturing method of the present invention is shown below.

Obtain the veneer number using raw wood, rotary lace, slicer, etc. The thickness of the veneer varies depending on the final part, but when used for flooring, it is preferably Q3 to 3 thick. Next, the veneer is left as a raw material or after drying, and is then dipped in a reactive coloring liquid or coated with a spray, roll coater, etc., and left at room temperature to be colored. The reactive coloring liquid used at this time includes inorganic acids such as nitric acid, hydrochloric acid, and sulfuric acid, alkalis such as sodium carbonate, ammonia, sodium hydroxide, and sodium hydrogen ash, ferric chloride, and ferrous sulfate. , cobalt chloride, copper sulfate, cobalt nitrate and other metal salts, dimethyamine, triethylamine
Examples include fatty acid amines such as amine, diethanolamine, and triethanolamine, other pyridines, and aromatic amine compounds. Among these, it is preferable to use one or a mixture of two or more kinds.

Next, the colored veneer is dried by hot air, high frequency, etc. to a moisture content of 10% or less, placed in a vacuum-pressure cooker, and unsaturated polyester, METAC! Impregnate the veneer with a synthetic resin such as j/L/methyl acid. After finishing the impregnation,
Remove excess synthetic resin from the surface of the veneer and semi-cure with hot air.

Next, a semi-hardened veneer is placed on the base plate coated with adhesive, and is integrally fixed to the base plate using a hot press.

Next, apply a coloring agent to the surface of the veneer using a squall coater.
Apply with a flow coater, etc. The colorant used is preferably a water-soluble dye or pigment.

Further, after the colorant has dried and fc, excess colorant adhering to areas other than the vessel portion is removed by sanding, brushing, etc.

Finally, a clear synthetic resin is applied to the surface of the veneer using a flow coater or the like, followed by hot pressing and other surface finishing and processing to obtain colored wood impregnated with synthetic resin.

Next, the method for producing the synthetic resin-impregnated colored wood of the present invention will be described in detail based on specific examples.

Example 1 A rotary veneer (thickness: 0.5%) of hardwood and oak (moisture content: (a)% or more) is immersed in a 1.0% aqueous solution of sodium carbonate for 1.5 hours. In addition, the veneers should be processed one by one by sandwiching them with spacers.

After finishing the treatment, the veneer is taken out and subjected to high frequency drying to reduce the moisture content to 7 to 8% or less. This dried veneer is placed in a vacuum-pressure cooker and the pressure is reduced. 10) After reaching -/L' or less, 1
After evacuating for at least 1 hour, synthetic resin was poured into the pot to impregnate the veneer. The blend of synthetic fat is unsaturated Holieste/I/
100 parts, nutylene monomer added, and 4 parts of BPO.

After leaving it in a reduced pressure state for about 1 hour, return it to normal pressure,
Leave it for another 4 hours or more to impregnate the veneer with the synthetic resin.

Next, after removing the excess synthetic resin adhering to the surface of the synthetic resin-impregnated veneer, it is once left in a hot air dryer at 120 to 140°C for 720 minutes to semi-cure the synthetic resin. This semi-cured synthetic resin-impregnated veneer was placed on plywood coated with adhesive and heated at 140 to 150°C for 10 NLl.
! ψ product (contact pressure, hot press for 3 minutes.

Next, 5 parts of Bornokunu Brown PM-3BR and 100 parts of water were applied to the surface of the synthetic resin-impregnated veneer in an amount of I to 00ψπ and dried. The application is based on Reno (- Throl Kotani). After drying, the surface of the veneer is polished to remove the coloring agent from areas other than the vessel area. Furthermore, a synthetic resin (same as that used for impregnation) is applied to the surface of the veneer. Coat with a flow coater (50-60 μU)
Fill the ducts and heat-press with the same properties as described above to harden the synthetic resin applied to the surface of the veneer. Finally, the product is processed and finished.

Example 2) Oak veneer with a thickness of 1.0 fJ was treated with sodium hydroxide 0.0
Immerse the blade in a 5% aqueous solution and leave it for a while.

The rest is the same as in Example 1).

Example 3) Spray a 1.0% aqueous solution of copper sulfate onto a 0.5M thick raw oak veneer at 150±20' l/n? (both sides) apply,
Laminate the veneers. Cover this with a sheet and leave it overnight.

Drying ~ Synthetic resin injection/impregnation ~ Semi-curing ~ Placing the base plate:
Same as Example 1).

A 5% aqueous solution of Suminol, Milling, and Brown 3G is applied to the surface of the veneer, and the excess dye is removed by drying.

The following is the same as in Example 1).

Example 4) From veneer yu color to veneer surface colorant application and removal, Example 1
)same as.

The synthetic resin applied to the surface of the veneer is methymethacrylate/l/
100 parts, 7 parts of methacrylic acid, BPO
2nd FiS' (5O-bQ sheet order city).

Example 5) Oak 0.5) tlJWL veneer (moisture content 10-15!%)
) is immersed in a 0.5% aqueous solution of nitric acid for 1 hr to color it. Synthetic resin impregnation, semi-curing, base plate attachment, etc. are the same as in Example υ.

(Effects of the Invention) Since the method for producing synthetic resin-impregnated colored wood of the present invention is configured as described above, the following effects can be achieved.

■ By depositing a coloring agent on the vessel, colored wood impregnated with a synthetic resin with sharp grains can be obtained.

■ Since the injected synthetic resin is not colored, many types of coloring are possible. In other words, it becomes possible to produce a wide variety of products in small quantities.

■ Since a clear synthetic resin is applied and cured, the surface of the veneer becomes smooth, making it suitable for use as a surface decorative layer for architectural boards, especially flooring materials.

Claims (1)

[Claims] (1) After impregnating and coloring wood with a reactive coloring chemical solution, it is impregnated with a synthetic resin and then semi-cured with hot air. A method for producing colored wood impregnated with a synthetic resin, characterized in that a coloring agent is then applied to the surface of the synthetic resin-impregnated wood and heat-cured to darken the vessel part of the broad-leaved tree and emphasize the grain part.