JPS59199202A - Method of bonding thrust board - 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 The present invention is a method for adhering a laminated board to a polyolefin resin surface or a slat material surface containing a polyolefin resin with high working efficiency.

Generally, when making so-called decorative plywood by gluing boards onto a base material such as plywood, the width of the board cannot be wider than the diameter of the raw wood, so usually several boards with a width of 100 to 300 mm are used. Decorative plywood of sizes such as 1800 mm x 900 mm is manufactured by arranging them side by side. Decorative plywood with a checkered pattern or the like is made by arranging a large number of small cut boards to form a decorative plywood of a certain size.

At this time, an adhesive with adhesiveness is applied on the base material, the boards are placed on top of it, temporary adhesion is performed using the adhesiveness, and then main adhesion is performed using a heat press. Adhesive work cannot be performed without using a tacky adhesive.

However, when the base material surface is a polyolefin resin, there is no adhesive among common adhesives that can effectively adhere to the polyolefin resin.

For example, when a complete waterproofing effect is required for the lower layer of a board, polyolefin resins are very advantageous in terms of waterproofing effect, cost, and processability, but conventionally, this has been abandoned due to the lack of an adhesive method. In addition, the decorative board, which has a layer of a mixture of polyolefin resin and wood flour on the bottom layer of the board, allows the surface of the board to be freely textured under heating conditions, so beautiful three-dimensional patterns can be embossed and engraved. Since it is easy to make a wind decorative board, there has been a demand for the development of a method for bonding a board to a substrate having such a polyolefin resin surface or a base material surface containing a polyolefin resin.

The present invention has been made to meet such demands, and includes a commonly used thermosetting adhesive for adhesive sheets, such as an adhesive made of a thermally crosslinkable modified latex resin and an amino resin crosslinking agent, and a polyolefin adhesive. Similar to conventional adhesives, the mixture is kneaded with resin powder and applied to the top surface of a base material with a polyolefin resin surface or a base material containing polyolefin resin, and then a temporary adhesive is placed on top of the base material. After attaching, the adhesive is completed by applying heat and pressure using a heat press, but the temperature during the heat press process must be set to above the melting point of the polyolefin resin powder (for example, 120 degrees or above in the case of polyethylene resin). Once set, the polyolefin resin in the adhesive layer has the following effects.

The polyolefin resin powder mixed in the thermosetting adhesive is placed as part of the adhesive coating between the base material having the polyolefin resin surface on the upper surface and the adhesive plate. When heated and pressurized during the process, the thermosetting adhesive starts a crosslinking reaction, and at the same time, the polyolefin resin becomes molten and begins to flow due to the press pressure. A part of it comes into contact with the surface of the base material, is compatible with the polyolefin resin that is the base material, and is completely fused. The other part also comes into contact with the surface of the mounting plate and is thermally fused to the lower surface of the mounting plate. The other remaining parts are interposed in the thermosetting adhesive layer, but their shape loses the shape of the particles before heating and is deformed into an Ameno shape when cooled, so it is not directly connected to the thermosetting resin. Even if it is not fused, an anchor effect will occur and it will not separate.In other words, when looking at the entire adhesive layer, it is partially fused to the base material surface of the polyolefin resin, so the adhesive strength is sufficient for practical use. Secured.

As described above, according to the method of the present invention, it is possible to attach a board to a polyolefin resin surface, which was originally considered impossible, with almost the same workability as conventional methods of bonding boards to plywood, etc. It is now possible to attach a seal.

Next, examples of the present invention will be specifically described.

Example 1 As a thermosetting adhesive, 65 parts of a thermally crosslinkable modified latex resin (SB-1124) manufactured by Mitsui Toatsu Chemical Co., Ltd.
Add 35 parts of amino resin crosslinking agent (8B-C-1) made by the company and mix with stirring, add 3 parts of wheat flour to the obtained product.
0 parts and 20 parts of water were added and stirred to prepare a thermosetting adhesive.

Subsequently, 80% of the thermosetting adhesive obtained as above
Adhesive polyethylene resin powder manufactured by Mitsui Petrochemical Industries, Ltd. (N8-100) was mixed and stirred at a ratio of 20% to obtain an adhesive for polyethylene.

On the other hand, an overlay plywood with a polyethylene coating formed on the plywood surface was used as a base material, and the polyethylene adhesive obtained in the above method was evenly applied to the surface at a ratio of 130 g/772", and a thickness of When I placed a 0.2mm cherry blossom board and pressed it lightly, a temporary bond was created by the adhesive force of the adhesive.I left it in this state for 60 minutes, then put it in a heat press.
After hot pressing at a pressure of 5 kg/ctA and a temperature of 140° C. for 60 seconds, it was taken out and left to cool, yielding a cherry blossom decorative plywood having a completely waterproof polyethylene layer just below the surface layer.

Example 2 A 2 mm thick wood flour mixed layer on 2.7 mm thick plywood (
The adhesive for polyethylene obtained in Example 1 was uniformly applied to the surface of a base material having a mixture of wood flour 70 and polyethylene 30 (mixed and heat-molded) at a ratio of 1809/d, and a thickness of 0.9 mm was applied thereon. Line up the 2mm teak wood boards and temporarily glue them together.
After being allowed to stand for 0 minutes, heating and pressurization were performed under the same conditions as in Example 1, and the board and the wood flour mixed layer were able to be completely bonded together. The teak decorative plywood thus obtained has a wood powder mixed layer on the bottom surface of the panel, so if it is reheated and stamped, a three-dimensional decorative board can be made.

Claims (1)

[Claims] Mix the thermosetting adhesive for the attached plate with polyolefin resin powder, apply this to the polyolefin resin surface or the base material surface containing the polyolefin resin, and place the attached plate on top of it for temporary bonding. 1. A method for adhering attached plates, which comprises heating and bonding using a hot press at a temperature higher than the melting point of the polyolefin resin powder.