JP3017150B2 - Manufacturing method of wooden house interior materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wood-based house interior material in which formaldehyde emission is reduced.

[0002]

2. Description of the Related Art In recent years, formaldehyde released from wood-based house interior materials into rooms has been regarded as a problem as a causative substance of chemical sensitivity. That is, wood-based house interior materials are often made of wood-based substrates, such as plywood, particle board, MDF, and laminated wood for decorative purposes, but formaldehyde is volatilized from the adhesive used to manufacture the above-mentioned substrates. It is.

For example, plywood is manufactured by laminating a plurality of veneers with an adhesive. Examples of the adhesive include a urea resin adhesive containing formaldehyde in a raw material, a melamine resin adhesive, and a phenol resin. System adhesives are frequently used. Therefore, wood-based house interior materials using plywood (ceiling boards, storage materials, flooring, siding boards, skirting boards, peripheral edges,
Panel material) releases formaldehyde remaining in the adhesive used in the manufacture of plywood.

[0004]

For the reasons described above, in recent years, there has been a strong demand for wood-based house interior materials that emit a small amount of formaldehyde, and JAS has established standards regarding the amount of formaldehyde emission from plywood. On the other hand, in order not to release formaldehyde from the plywood, it is most preferable to use an adhesive containing no formaldehyde, but this method increases the production cost of the plywood.

[0005] As means for reducing the amount of formaldehyde released from wood-based house interior materials, there is a means for attaching a formaldehyde catch sheet to a wood-based substrate.
However, this method cannot provide a sufficient effect of reducing the amount of formaldehyde emission, and requires a separate line for attaching a formaldehyde catch sheet, which reduces the productivity of wood-based house interior materials and significantly increases manufacturing costs. I do.

The present invention has been made in view of the above circumstances, and it is possible to sufficiently reduce the amount of formaldehyde released from wood-based house interior materials, and not to reduce the productivity of wood-based house interior materials. Moreover, it is an object of the present invention to provide a method for manufacturing a wooden house interior material without significantly increasing the manufacturing cost.

[0007]

Means for Solving the Problems The present inventors have achieved the above object.
As a result of intensive studies to achieve this, Holm Aldehi
Is a compound that reacts with formaldehyde and traps formaldehyde
Formaldehyde scavengerAnd a sulfate or sulfiteThe vinegar
Using an adhesive added to the vinyl acid resin emulsion
When the wooden substrate and the decorative sheet are bonded together,
~ The above-mentioned object is effectively achieved.
Was found to be.

When a wood substrate and a decorative sheet are adhered to each other with an adhesive obtained by adding a formaldehyde scavenger to a vinyl acetate resin emulsion obtained by emulsion polymerization of vinyl acetate in water, the formaldehyde scavenger is added to the vinyl acetate resin emulsion. Satisfactorily penetrates into the wood-based substrate together with the water contained therein, and the formaldehyde scavenger reacts efficiently with the formaldehyde in the adhesive to effectively trap formaldehyde. As a result, it is possible to achieve JAS standard F1 (average formalin concentration (concentration in water) of 0.5 mg / l or less) relating to the amount of formaldehyde released from plywood. A formaldehyde scavenger in the adhesive
Since only a sulfate or a sulfite is added, the existing wood-based house interior material production line can be used as it is, so that the productivity is not reduced and the cost is not greatly increased. Since the formaldehyde scavenger is harmless and not a volatile substance, there is no problem in safety and health. An excellent effect of reducing formaldehyde emission can be obtained irrespective of the thickness, configuration and species of the wood substrate. Formaldehyde trap on adhesive
By adding sulfate or sulfite together with the scavenger,
To obtain better formaldehyde emission reduction effect
Can be.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. In the present invention, a decorative sheet is attached to a wood-based substrate that releases formaldehyde with an adhesive. Here, as the wood-based substrate, for example, plywood, particle board, MDF, laminated wood for makeup and the like can be mentioned. Examples of the decorative sheet include a paper decorative sheet, a plastic decorative sheet, and a wooden decorative sheet.

In the present invention, the adhesive used is a vinyl acetate resin emulsion to which a formaldehyde scavenger is added. In this case, as the vinyl acetate resin emulsion, an emulsion obtained by emulsion polymerization of vinyl acetate in water can be used, but its properties are not particularly limited. As the formaldehyde scavenger, a compound that reacts with formaldehyde to scavenge formaldehyde is used. As the compound, for example, one or more selected from urea, thiourea and ammonium chloride can be suitably used. Further, a sulfate or sulfite such as sodium sulfite is added to the adhesive used in the present invention together with a formaldehyde scavenger .
Thereby, a more excellent formaldehyde emission reduction effect can be obtained.

The amount of the formaldehyde scavenger to be added to the adhesive can be appropriately determined according to the type of the wood substrate, etc., but is usually 5 to 20% by weight, especially 7 to 14% by weight of the whole adhesive. It is appropriate to do so. If the amount is less than 5% by weight, a sufficient effect of reducing formaldehyde emission may not be obtained. If the amount exceeds 20% by weight, the properties of the adhesive may be adversely affected.

Addition of sulfate or sulfite in the adhesive
The amount is 2 to 10% by weight of the whole adhesive, especially 3 to 7% by weight.
It is appropriate that If the amount is less than 2% by weight, the effect of adding the sulfate or sulfite may not be sufficiently obtained, and if it exceeds 10% by weight, the properties of the adhesive may be adversely affected.

[0013]

As described above, the method for producing a wood-based house interior material according to the present invention can sufficiently reduce the amount of formaldehyde released from the wood-based house interior material.
It does not cause a decrease in the productivity of wood-based house interior materials, and does not significantly increase the production cost.

Claims (3)

(57) [Claims] 1. A method for manufacturing a wood-based house interior material by bonding a decorative sheet to a wood-based substrate that releases formaldehyde with an adhesive, wherein the adhesive is a vinyl acetate resin emulsion and a formaldehyde scavenger and a sulfate.
A method for producing a wood-based house interior material, comprising using an adhesive obtained by adding a sulfite . 2. The method according to claim 1, wherein the formaldehyde scavenger is at least one compound selected from urea, thiourea and ammonium chloride. 3. The amount of sulfate or sulfite added to the adhesive
The woody substance according to claim 1 or 2, which is 2 to 10% by weight of the body.
A method of manufacturing interior materials for homes.