JPH0651168B2 - Repair method with good sander characteristics, sealing method and wood board using the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a foaming coating agent to seal a wooden board surface such as plywood and to repair a concave portion thereof, and to improve sander characteristics of the wooden board surface. And a coating agent used in the method,
Furthermore, the present invention relates to a wood board subjected to the method.

[Conventional technology]

Since the surface of wooden boards such as boards, columns, and plywood has cracked surfaces of conduits and wormholes, it has been customary to apply repair agents or sealing agents for the purpose of repair or sealing. For these reasons, sealing agents such as abrasive powder and titanium paste, and various latex, repair agents such as epoxy resin and urethane resin paints are used.

[Problems to be Solved by the Invention]

However, the sealing agent and the repairing agent according to the above-mentioned conventional technology are used separately, and therefore, although the sealing agent has a sealing effect, it can fill wormholes such as wood and large conduits. There wasn't. Also, the recesses to be repaired such as wormholes differ depending on the type of material, the size of the hole, the depth, etc., and since it does not occur at a certain place, it is unavoidable to manually apply a putty-like thing with a trowel etc. It depends on the repair method.

Also, when attempting to repair the entire surface of a board or plywood using a conventional knife coater, using a normal thermosetting resin or an aqueous latex with a low film-forming temperature will cause a short working time and clogging of the sander. This caused problems such as easiness, which increased the number of times glue was made and the number of times sanders were replaced, which was a disadvantage for mass production.

The present invention is to solve the above-mentioned problems related to conventional sealing and repair work. By using a foaming coating agent for repairing and sealing, and applying this to the entire surface of the wooden board, It is intended to provide a method for improving the sander characteristics.

[Means for Solving the Problems]

The method for sealing and repairing the surface of a wood board of the present invention and the wood board subjected to the method are an aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, and a filler on the wood board surface such as wood and plywood. And a foaming coating agent consisting of a dedicated curing agent and an organic polyisocyanate or a foaming agent is applied to the entire surface while pressing (following) the application surface, and the conduit, crack, groove, insect hole, press mark on the plate surface is applied. And the like are filled with the coating agent.

In the present invention, the above-mentioned profile pressurization means that after applying the coating agent, the application surface is pressed with a trowel or the like. In order to apply pressure, for example, a doctor knife made of thin steel plate, which is usually used for coating, is used.
cm is parallel to the wood board surface to be applied, and several in the moving direction of the wood board surface.
It is arranged on the wood board surface at a certain angle so that it touches cm, and the knife is used to squeeze and apply the application material, and the tip end surface of the knife is pressed against the wood board surface.

Therefore, the application device of the present invention, as a means for applying the coating agent to the wooden board surface, a flexible member such as a doctor knife for scraping the coating agent arranged at an appropriate angle with respect to the wooden board surface, And a means for pressing the flexible member so that its tip portion contacts the surface of the wooden board with an appropriate width.

In the present invention, as a coating device, a knife coater type is usually used. As a method of contacting the tip portion of the flexible member to the surface of the object to be coated such as plywood with a width of several cm, for example, in the case of a doctor knife-shaped plate, with respect to the coating surface
It is advisable to press the plate-like body in a curved shape by applying pressure from the back surface of the plate-like body arranged at an acute angle of 40 degrees or less, that is, the surface not in contact with the coating agent, with a roll having an appropriate diameter.

The foamable coating agent used in the present invention is a viscous liquid suitable for coating, and is a conduit, a crack, or the like which is present on the surface of a wooden board during coating.
Any material can be used as long as it can be filled in recesses such as grooves, insect quill holes, and press marks and can be foamed to form a dense and strong foam layer.

As a method of forming the foam layer, there are a method of utilizing the generation of bubbles by a volatile liquid and a method of generating a gas such as carbon dioxide gas. As the volatile liquid, CFCs such as trichloromonofluoromethane and trichlorotrifluoroethane, liquids such as methylene chloride trichloroethane, acetone and isopropyl ether can be used.Silicone-based foaming is used to uniformly disperse the volatile liquid. Combination with agents and the like is also possible.

As a method of generating a gas such as carbon dioxide gas, sodium bicarbonate, calcium carbonate, guanidine carbonate or the like can be used.

Particularly preferred as the coating agent for repair and sealing of the present invention is a coating agent comprising an aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, a foaming agent, a filler and a dedicated curing agent. Further, a coating agent comprising an aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, an organic polyisocyanate, a filler and a dedicated curing agent is also preferable.

The coating agent is applied to the surface of the wooden board and then dried in a dryer. Formaldehyde resin, which is thermosetting in the process, cures rapidly in the presence of a dedicated curing agent,
An aqueous latex having a high film forming temperature (5 ° C. or higher) forms a hard coating film. Therefore, it is possible to prevent the coating solution from excessively penetrating into the wood, reduce the eye loss, and prevent sticking during the deposition.

Furthermore, since the coating film after drying is hard and uniform, clogging is less likely to occur during surface treatment with a sander, and grinding can be performed easily.

As the aqueous latex, ethylene vinyl acetate resin, vinyl acetate resin, acrylic resin, acrylic acid-acrylic acid ester copolymer resin, acrylic-styrene copolymer resin,
There are emulsions such as acrylic-ethylene-styrene copolymer resin, styrene-butadiene latex, carboxylated chloroprene rubber latex, and the like. Among these, one or two or more having a minimum film forming temperature of 5 ° C or more can be used in combination.

As the aqueous latex, a commercially available one can be used, and one having a solid content of 35 to 60% by weight is usually used.

Latex having a film-forming temperature of 5 ° C. or lower has a soft coating film when dried, and is difficult to grind during sanding, which lowers workability.

As the formaldehyde resin, urea resin, melamine resin, phenol resin, urea melamine co-condensation resin,
There are resorcinol resins, acetone resins, and the like, and these can be used alone or in combination of two or more.

As the filler, talc, clay, calcium carbonate, titanium, mica, bentonite, asbestos wood powder, blood powder,
Usual fillers such as corn gluten can be used.

As the organic polyisocyanate, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl polyisocyanate (C-MDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HD
I), hydrogenated TDI, hydrogenated MDI, hydrogenated XD
I, isophorone diisocyanate, or modified products thereof or mixtures thereof can be used.

As the dedicated curing agent, inorganic salts such as ammonium chloride and ammonium sulfate, which react with free formaldehyde in the coating agent to generate an acid, inorganic acids such as hydrochloric acid and sulfuric acid, carboxylic acids such as malic acid and citric acid, or bulk acids. There are sulfonic acids such as toluene sulfonic acid, and one or more of them can be used in combination.

The addition amount of the dedicated curing agent is in the range of 0.01 to 0.5, preferably 0.05 to 0.30 by weight ratio to the formaldehyde resin.

If the ratio is 0.01 or less, curing will be insufficient and sticking during deposition and deterioration of grinding performance during sander treatment will be caused.
On the other hand, when it is 0.5 or more, the curing is rapid and the pot life of the coating agent is shortened, which makes the work difficult.

In addition to the above-mentioned components, the coating agent of the present invention may contain a modifier such as an ultraviolet absorber or a surfactant which is usually used in this type of coating agent.

Examples of the modifier include viscosity-imparting agents such as sodium polyacrylate and cellulose ether, surfactants such as sodium dodecylben sulfonate, dispersants such as melamine sulfonic acid and polycarboxylic acid, water-soluble epoxy compounds, polyvinyl formal. There are coating strength enhancers such as, and these can be used alone or in combination of two or more as required.

[Action]

According to the present invention, as a foamable coating agent, an aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin,
When using a resin composition composed of a filler and a dedicated curing agent and a foaming agent or an organic polyisocyanate, a flexible member such as a knife for application is applied to a wood board surface such as a board or plywood when applying the resin composition. Since the contact is made on the surface from the line, the coating agent filled in the concave portion such as the groove and the crack is filled by the bending of the tip of the flexible member to the surface of the concave portion or more in a compressed state to fill the volume of the concave portion or more. , The coating material that has entered the concave portion of the article to be coated is reduced to atmospheric pressure after passing through the flexible member,
Swelling to more than each volume of the concave portion, and at the same time, it is possible to fill without blinding due to volume expansion due to foaming in the curing process of the coating agent,
Sealing and repair work can be completed in one step.

Further, in the drying step after applying the coating agent on the surface of the wooden board, the formaldehyde resin in the coating agent causes a rapid crosslinking reaction in the presence of the curing agent, and at the same time, the film forming temperature is high (5 ° C. or higher). Since the aqueous latex forms a strong coating film, grinding can be easily performed without causing clogging during the sander treatment.

〔Example〕

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

Example 1 70 parts of a urea resin (Hoonen Corporation product UW-082) having a solid content of 63% was mixed with a styrene-acrylic copolymer (Hoechst synthetic product Movinyl 864, minimum film forming temperature).
(16 ° C.) 30 parts and 2 parts of the viscosity imparting agent SN thickener 808 (San Nopco product) were mixed and stirred in advance. As a pigment, 0.15 part of carbon black and 0.15 part of red iron oxide were added, and as a filler, 30 parts of calcium carbonate, 10 parts of wood flour and 3 parts of water were added and stirred well.

Finally, 10 parts of malic acid was added as a curing agent, thoroughly mixed and stirred, transferred from a tank to a tiger server by a snake pump, and uniformly discharged on a line from a traverser as a resin coating agent for repair and sealing.

The discharged liquid is evenly applied to the plywood surface with a knife coater with a knife angle of 20 degrees and a contact width of 15 mm, and then dried at 90 ° C in a dryer.
After drying for a minute, it was deposited. The plywood that had been left to deposit for 24 hours was subjected to a sander treatment to obtain a repaired / sealed plywood of the present invention.

Example 2 A vinyl acetate / ethylene / vinyl chloride copolymer resin (Hoechst synthetic product Movinyl 1) was added to 80 parts of 60% solids melamine resin (Honen Corporation product MW-085).
91E, 20 parts of the minimum film forming temperature of 30 ° C., and 1 part of a melamine-based dispersant (Nisso Master Builders product NL-4000) were mixed and stirred in advance.

Next, 0.5 part of carbon black as a pigment, 30 parts of titanium oxide as a filler, and 20 parts of clay were mixed, and then 10 parts of ammonium chloride was added as a curing agent, followed by thorough mixing, followed by the same method as in Example 1. It was applied to the surface of plywood with, dried and deposited, and then sanded.

Example 3 80% solid content phenolic resin (Honen Corporation product PS-153) 70 parts Silicone type foam stabilizer (Nunicar product L-5421) 1.5 parts, styrene-alkyl acrylate copolymer (Mitsubishi Yuka bar Dish product YJ-1595D, minimum film forming temperature 20 ° C) 30 parts are mixed and stirred, then rice powder 10 parts as a filler, talc 5 parts and red iron oxide 0.2 parts as a pigment are gradually added and mixed, and trichlorotrichloride as a foaming agent is added thereto. 6 parts of fluoroethane (R-113 manufactured by Daikin Industries, Ltd.) was uniformly dispersed and mixed.

Finally, 10 parts of p-toluenesulfonic acid was added and mixed as a curing agent, and applied on the surface of plywood in the same manner as in Example 1, dried and deposited, and then sandered.

Example 4 50 parts of a urea / melamine co-condensation resin (Hoonen Corporation product UW-096) having a solid content of 72%, an acrylic resin emulsion (Japan Synthetic Rubber Product AE-315) 50
The parts were mixed and stirred in advance.

Next, 0.5 part of carbon black as a pigment and 20 parts of clay as a filler were mixed, and then 5 parts of ammonium sulfide as a curing agent were added and uniformly mixed to quickly mix 5 parts of tolylene diisocyanate. It was applied to the surface of plywood by the same method as shown in Example 1, dried and deposited, and then sanded.

Comparative Example Vinyl Acetate Resin (Showa High Polymer Product Polysol PS-3H
A) 100 parts, diethylene glycol 5 parts, clay 30 parts,
5 parts of talc and 5 parts of water are mixed and stirred. Further, 0.15 part of carbon black and 0.15 part of red iron oxide were added and mixed. This mixture was applied to the surface of plywood in the same manner as in Example 1, dried, deposited, and then sanded.

Table 1 shows the sealing and repairing effect of each plywood manufactured by the above Examples and Comparative Examples.

[Effect of the Invention] According to the present invention, it is possible to perform the sealing and repair which were conventionally performed in two steps without any trouble in one step, and the repairing and sealing application agent to be used has a long service life, Since the obtained film also has an excessive hardness, the sanding finish treatment is easy, and a wooden board having excellent smoothness and good workability can be obtained.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A 63-178876 (JP, A) JP-A 50-52211 (JP, A) JP-B 49-30084 (JP, B1) JP-B 48- 40722 (JP, B1)

Claims (4)

[Claims] 1. A foaming coating agent composed of an aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, a foaming agent, a filler and a dedicated curing agent is applied to a wood board surface such as wood or plywood. Applying to the entire surface while applying pressure to the surface, filling the recesses such as conduits, cracks, grooves, wormholes, press marks, etc. on the plate surface with the coating agent, and repairing with good sander characteristics, sealing method . 2. A water-based latex having a minimum film-forming temperature of 5 ° C. or higher, a formaldehyde resin, on a wood board surface such as wood or plywood.
By applying a foaming coating agent consisting of a foaming agent, a filler and a dedicated curing agent to the entire surface while applying pressure to the coating surface, the recesses such as conduits, cracks, grooves, wormholes and press marks on the plate surface are applied. A wooden board for repairing and sealing with good sander characteristics, which is characterized by being filled with the coating agent. 3. An aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, on a wood board surface such as wood or plywood.
A foaming coating agent consisting of an organic polyisocyanate, a filler and a dedicated curing agent is applied to the entire surface while applying pressure to the coating surface, and the recesses such as conduits, cracks, grooves, wormholes and press marks on the plate surface are applied. A method of repairing and filling with good sander characteristics, which comprises filling with the coating agent. 4. An aqueous latex having a minimum film forming temperature of 5 ° C. or higher, a formaldehyde resin, on a wood board surface such as wood and plywood.
By applying a foaming coating agent consisting of an organic polyisocyanate, a filler and a dedicated curing agent to the entire surface while applying pressure to the coating surface, conduits, cracks, grooves, wormholes, press marks, etc. on the plate surface A wooden board for repairing and sealing with good sander characteristics, characterized in that the recesses are filled with the coating agent.