JPS61130002A - Manufacture of colored particle board - Google Patents

Abstract

PURPOSE:To make it possible to obtain a colored particle board that are excellent in physical properties, free from color migration at high temperature and humidity, and also free from decoration in warm water, by coloring vegetable chips desirably with an aqueous pigment, dye or the like, and adding a binder containing a self-emulsifiable isocyanate compound to the chips. CONSTITUTION:As a colorant used, can be mentioned any one of aqueous pigments or dyes that can be used by dissolving or dispersing in water, for example, nonreactive pigments, direct dyes and reactive dyes. When a self- emulsifiable isocyanate compound is used as a binder for vegetable chips, the water content of the chips can be allowed about up to 20%, and the heating time under pressure when they are molded can be reduced to 1/2 to 1/4 of usual case. The stability of the color of the colored particle board can be improved, an there is no color migration at a high temperature and humidity and no discoloration in water.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides vegetable chips colored with aqueous pigments, dyes, etc., which have the property of being easily emulsified with water without using an emulsifier. The present invention relates to a method for producing colored particle board, which comprises blending a self-emulsifying isocyanate 1 to compound as at least one component of a binder and molding the board by a conventional method.

(Prior art) Particle board has been widely used in fields such as IL furniture manufacturing, and is usually used as a binder for wood chips, wafers, sawdust, vegetable fibers, crop waste, etc. Phenol, formalin, melamine, urea, etc. Particle boards containing φ formalin resin, urea-formalin resin, isocyanate 1 to compounds, etc., and molded by hot pressure using conventional methods are not known. do not have.

(Problems to be Solved by the Invention) The present invention is a further development of the conventional uncolored particle board. This relates to colored particleboard, which is characterized in that it is formulated with a binder containing at least one of the self-emulsifying isocyanates and then molded under heat and pressure using a conventional method. It offers a new distinction in the fields of construction, furniture, toys, miscellaneous goods, displays, etc., whose applications have been restricted due to this.

(Means for solving the problem) The vegetable chips used in the present invention include lauan,
In addition to ordinary wood chips such as larch and Douglas fir, any of wafers, sawdust, plant fibers, crop waste, etc. can be used.

Further, as the coloring agent used in the present invention, any aqueous pigment or dye that can be used by dissolving or dispersing in water can be used. That is, colorants such as non-reactive m''a, direct dyes, and reactive dyes can be used.

Examples of self-emulsifying iso-isocyanate compounds used as binders include self-emulsifying MDI polyisocyanates (Coronate 3054, manufactured by Nippon Polyurethane Industries, Ltd.); It refers to a polyfunctional isocyanate compound that can be easily dispersed in water by stirring.

Further, the colored particle board of the present invention can be molded by a thermopressure molding method that is exactly the same as the molding method of other particle boards.

(Function) When a self-emulsifying isocyanate compound is used as a binder for vegetable chips, it can be used with conventionally used thermosetting resin adhesives such as phenol resin, melamine/urea resin, and urea resin, and ordinary isocyanate. As seen when using compounds, the moisture content of the chips is 5.
% and requires a long time for hot pressing during press molding, the moisture content of chips is about 20%.
%, and the heat pressure time during molding can be shortened to 1/2 to 1/4 of the normal time. What is noteworthy is that the color stability of the colored particle board has improved, and it can withstand high temperatures and high temperatures. There should be no color transfer during continuous use, no color removal under water, etc.

Furthermore, the particle board of the present invention has superior strength compared to general particle boards.

Since the self-emulsifying isocyanate compound is water-dispersible, it has good workability, and is also characterized by being easy to use in combination with other aqueous binders or to switch between uses.

It is preferable to use the self-emulsifying isothiaphor 1-compound used in the present invention alone, but the phenol resin,
It is also possible to use it in combination with thermosetting m-lipid adhesives such as urea-melamine resins and urea resins, as well as other in-sear 1-compounds. In addition, in the production of non-flammable particleboard, it is possible to use a waterproofing agent such as a wax emulsion together with commonly used auxiliary agents.

Next, the present invention will be explained in more detail with reference to Examples.

Example /.

Non-reactive water-based red pigment (manufactured by Dainippon Ink Chemical Co., Ltd., 5
D-1043, solid content 45%) 230Q in water 2300g
After adding it to the liquid to make it uniformly diluted, add 1.2
%×0.1￥n×15% larch whelk 500g 2
After soaking the seeds for one day, they were dried in a 100°G hot air dryer for one day and a night to obtain red-colored larch tubers.

Next, the red-colored Japanese larch was added to 5009
While stirring, add a self-emulsifying isocyanate compound (
Coronate 3054) 25, manufactured by Nippon Polyurethane Kogyo Co., Ltd.
After diluting Q twice with water and spraying it, stirring it evenly, put it in a forming box with a length and width of 26 cm x 28 cm, and press it lightly. Then, place the forming box into a printing plate. A 10% thick spacer was placed along the periphery of the resulting forming cage mat, and hot-pressure molding was performed under the conditions of 140°C/3 minutes/30 K9/cJ to obtain a chip with a specific gravity of 0.7. A beautiful colored particle board that was uniformly colored red even inside was obtained.

The colored particle board obtained in this example did not undergo color transfer even under high temperature and high humidity conditions, and did not suffer from color loss due to decolorization even in water.

This was prepared for comparison with this example, containing 10% of urea resin (48% solids content) as a binder, and 140°
It has higher bending strength and Young's modulus than particle board molded under hot pressure conditions of C/12 minutes/30K9/cat, making it an excellent material for furniture, miscellaneous goods, and displays.

In addition, a colored particle board prepared for comparison showed significant color transfer under high temperature and high humidity conditions, and significant discoloration in water.

Example Ω.

W contact dye (manufactured by Cibakai Key Co., Ltd., chrysophemine 0X) 7
．． 5! ;1 and sodium sulfate 250Q into water 25009 to obtain a yellow direct dye bush.

Next, lauan powder chips (
0.1% x 1.5% x 15%) 5009 was added and soaked at room temperature for 2 days, and then further heated at 30 to 40°C for 15 minutes for 10 minutes.
After treatment at 0°C for 30 minutes, remove and wash with water.
It was dried in a 00°G hot air dryer for a day and night to obtain yellow colored lauan wood chips. Thereafter, a yellow colored particle board was obtained in the same manner as in Example 1 using a self-emulsifying isocyanate compound as a binder.

The colored particle board obtained by this method was heated at 60°C.
A bright particle hoard was obtained that did not discolor even in hot water and did not lose its strength, making it suitable as an inch rear furniture material.

Example 3〜Reactive Dye''B (manufactured by CibaKaiKee Co., Ltd., K
Black B) 7.59, 250 g of sodium sulfate, and 509 g of sodium carbonate were added to 25,009 g of water to obtain a blue-black reactive dye solution.

Next, in this reactive dye solution 2500!7, Douglas% Furchip (0.1% x 1.5 x 151300
After adding 200 g of sawdust and soaking it in Tobuchi for 2 days, it was treated at 60°C for 45 minutes, removed and washed with water.
The mixture was dried in a hot air dryer at 100° C. for one day to obtain mixed chips colored blue-black. Hereinafter, in the same manner as in Example 1, the self-emulsifying isocyanate 1-compound used in Example 1 and the Coria-formalin resin adhesive 0 were added as a mixed binder, and 3% of each as an active ingredient was added to the mixed chip. A particle board which was molded under hot pressure and colored in a blue-black color was obtained.

The particle board obtained in this example does not discolor even in water at 60°C, has excellent physical properties such as bending strength, and is suitable as a board for toys and miscellaneous goods.

(Effects of the Invention) Although the colored particle board of the present invention uses a water-based colorant and a water-based binder, it has extremely good color fixation stability, and there is no color transfer etc. even under high temperature and high humidity.
It does not discolor even in hot water and has good physical properties, making it suitable for construction, furniture, cancer odor, and miscellaneous goods. What is particularly noteworthy about the effects of the present invention is that in the presence of the aqueous colorant used in the present invention, the self-emulsifying isocyanate compound, vegetable chips, etc., the effect is synergistically expressed due to their interaction.

Claims (1)

[Claims] 1. A method for producing colored particle board, which comprises mixing vegetable chips pre-colored in a predetermined color with a binder containing a self-emulsifying isocyanate compound as at least one component and molding the resultant.