JPS6143161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a surface-reinforced decorative board whose surface is laminated with a synthetic resin-injected thin board.

Conventionally, W.
PC processing is used in various fields such as building materials, household goods, and sporting goods, and its applications are expanding rapidly today.

In particular, for building materials, we are improving softness and abrasion resistance, which are disadvantages of wood, and creating new cosmetic properties (design properties).
In search of this, decorative laminates, which are made by injecting synthetic resin into thin wooden boards and hardening them into one piece, are becoming more and more popular. However, it is very difficult to uniformly inject synthetic resin liquid into the wood cells because the material of the wood itself is extremely uneven and fillers may be stuck inside the tissue, and it is difficult to inject the synthetic resin liquid evenly into the wood cells. You don't get what you put in. Therefore, WPC veneer flooring, sills, rising frames,
Thin plates are still used for stairs, etc. not only for cost reasons but also to improve injection performance. However, when synthetic resin liquid is injected into a thin board, contrary to the improvement of injectability, the veneer becomes transparent and the color of the adhesive underneath or the color of the base material becomes too strong. It has become difficult to handle.

In response to this, there has recently been a movement to make WPC-treated veneers as thick as possible to improve the performance and cosmetic properties of WPC, and stacking multiple synthetic resin injection-treated veneers can replace thick materials. It is.

That is, in this method, an adhesive is applied to a base material and a cured or uncured synthetic resin injected thin plate is placed on the base material.
After applying heat and pressure, the surface is sanded, an adhesive is applied, and a cured or uncured synthetic resin injected thin plate is placed on the surface, which is then applied with heat and pressure. This operation is repeated according to the required number of thick sheets.

However, this method had problems because it required repeated sanding and adhesive application, which made the work complicated and the adhesive cost too much.

Furthermore, when bonding uncured veneers together, water vapor and solvent gas can accumulate between the layers of synthetic resin-injected veneers, easily resulting in poor adhesion (punks), and the product defect rate increases as the number of layers of injected veneers increases. Due to this difficulty, it was not very efficient.

Therefore, the present invention provides a method for manufacturing a laminated surface-reinforced decorative board which solves all the problems of poor workability and adhesion that occur when laminating and curing synthetic resin-injected veneers as described above.

In other words, a surface-reinforced decorative board is manufactured by stacking a plurality of uncured synthetic resin-injected thin sheets with different amounts of hardening agent added on an adhesive-coated base material in descending order of the amount of hardening agent added and bonding them together by heat-pressure bonding. It is the law.

To further explain this invention in detail, the curing agent BP
A plurality of uncured thin plates injected with unsaturated polyester resin with different amounts of O (benzoyl peroxide) added are stacked on top of an adhesive-coated base material in descending order of the amount of curing agent added. At this time, adhesive is applied only between the base material and the first resin-injected veneer, and is not required at all between the other resin-injected veneers. this
Heat and pressure integration is carried out at 140℃ and 8Kg/cm for ^several minutes to several tens of minutes to produce a thick surface-reinforced decorative board with a WPC treated veneer layer.

The reason why the amount of hardening agent added is changed for each laminated veneer is that if the hardening agent is the same for the laminated resin-injected veneers, the injected veneers in contact with the hot plate will transfer heat quickly and will reach the resin curing temperature immediately. However, the veneer below that veneer takes some time to reach the curing temperature due to heat transfer delays.

At this time, the solvent from the heated lower veneer before curing turns into a gas and tries to escape to the outside of the veneer. However, since the hot plate side is already hardening, it cannot escape and gets stuck between the layers of the veneer, resulting in a puncture.

In order to prevent this, the amount of curing agent added is increased as the distance from the hot plate increases, and the curing speed of the resin increases as the amount of curing agent added increases, and moreover, the curing reaction proceeds from a lower temperature. For this reason, the reaction progresses according to the rate of heat transfer from the hot plate, so that the entire laminated veneer is cured almost simultaneously.

Therefore, there is no uneven generation of solvent gas, and punctures can be prevented.

The amount of curing agent added here naturally varies depending on the type of thermosetting synthetic resin, the type of curing agent, the thickness of the resin-injected veneer, press pressure, time, and temperature, but in general, unsaturated polyester If it is a laminated type with two injection point plates, the weight is 8Kg/cm ² , the temperature is 140℃, and the thickness of the veneer is 1.0m/m, the amount of hardener BPQ added should be the amount of the injection point plate in the first layer in contact with the adhesive. The weight ratio of the board is 2% thermosetting synthetic resin, and the second layer veneer is the same as the first layer veneer.
80% suitable.

As described above, by laminating resin-injected veneers with different amounts of curing agent added without the use of adhesives, the resin curing between the veneers becomes smoother, and the work that was previously caused by the use of adhesives can be done smoothly. There is no problem of complicated process or poor adhesion between veneers, and because the thickness of the veneer has increased, the influence of the color of the adhesive or base material, which was caused by the transparency of thin veneers, has been reduced, and the product yield has been improved. The results are extremely significant.

Example An example in which this invention is applied to a sill will be explained with reference to the drawings. Four unsaturated polyester resin-injected Yonegi veneers 1.0m/m1, 2, 3, 4 are used, and a hardening agent (BPO) is added. The amounts are 2%, 1.6%, and 1.3 respectively.
%, 1.0%, adhesive (Kurataku) 6 application amount
Apply uniformly on the veneer laminate material 7 with a roll coater under the condition of 13 g/cm ² , and then coat the veneers 1, 2, etc. on top of it with a roll coater.
3 and 4 were placed in this order, and heat-pressure curing bonding was performed at 140° C. and 8 Kg/cm ² for 15 minutes. A sill groove 5 was processed and a 0.8 m/m colored rice veneer 8 for decoration was glued to this, resulting in a sill with a deep appearance and no adhesion defects (punctures).

[Brief explanation of the drawing]

The drawing is a side view showing an embodiment of the present invention. 1, 2, 3, 4...Unsaturated polyester resin injected rice veneer, 5...Sill groove, 6...Adhesive, 7
...Laminated veneer lumber, 8...Colored rice toga veneer for cosmetic purposes.

Claims (1)

[Claims] 1. In a method for manufacturing a decorative board in which a plurality of thermosetting synthetic resin-injected veneers are pasted on the surface, thermosetting resin-injected thin veneers with different amounts of hardening agent are placed on a base material coated with an adhesive. When placing multiple veneers without intervening adhesive between them, the veneers with the highest amount of curing agent are stacked one on top of the other, starting with the base material, and the injected resin is cured while simultaneously adhering the base materials. A method for producing a laminated surface-reinforced decorative board characterized by its integration.