JPS5898204A - Manufacture of synthetic resin injected and treated wood and its treating agent - 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 provides synthetic resin injection treatment for straight-grained and thin-grained coniferous wood boards that has a beautiful wood grain pattern and improves hardness, abrasion resistance, and other physical properties. The present invention relates to a method and a treatment agent thereof.

Usually, synthetic resin injection treatment is carried out as a method to improve the hardness, wear resistance, and other physical properties of wood.The methods of curing the injected synthetic resin liquid include methods such as radiation, radiation, etc., and catalysts. It is broadly classified into a heat curing method by addition, but the former requires large-scale equipment and is not suitable for industrial production, so it is common in Japan that the latter method is not used. The heat curing method can be further divided into a method in which the injected resin liquid is cured without pressure, and a method in which the injected resin liquid is cured under pressure.

The non-pressure curing method involves curing the injected wood in a heated atmosphere such as air or nitrogen gas. In the case of this method, the sounding material part becomes transparent by being filled with resin, and the color of the wood is added, and curing is completed in a dark state, whereas the summer wood part becomes white and opaque. The original shading of the spring wood and summer wood is reversed. Of course,
A very clear wood grain pattern can be obtained. However, in industrial production, (1) deformations such as warping and twisting are likely to occur due to the internal stress of the wood or the shrinkage stress of the resin during curing. This tendency is particularly noticeable in grained materials, making subsequent processing tedious and difficult.

(2) When bonding cured thin wood boards to wood substrates, it is difficult to use ordinary wood adhesives because the surface is covered with cured synthetic resin, and epoxy adhesives, urethane adhesives, etc. It is necessary to use adhesives that are expensive and have poor workability. In some cases, it may be necessary to pre-treat the adhesive surface of the hardened wood, such as sanding.

There are many disadvantages to industrial production.

On the other hand, the method of curing under pressure involves curing the injected wood by pressing and heating using a hot press or the like.

In the case of this method, (1) it is possible to perform the adhesion to the wood base material at the same time as m-formation; At this time, since the real wood part of the injected wood is exposed, a general thermosetting wood adhesive that is inexpensive and has good workability can be used.

(2) Furthermore, when curing is complete, since it is adhesively fixed to the base material, deformations such as warping and twisting occur.

Although it has great advantages in terms of industrial production, in terms of appearance, both the spring and summer wood parts become transparent, and the color of the wood is added, making the wood darker. It has the disadvantage that only a poor finish can be obtained.

The present invention aims to eliminate such drawbacks and to obtain a wood grain pattern equivalent to or better than 11 by using a method of simultaneously performing curing and adhesion with good workability and by curing under no pressure. That is, even if wood is once compressed by compaction pressure, as long as the pressure is not high enough to destroy the wood, a restoring force is generated that tends to return to the original state after the pressure is released. At this time, if the adhesive force between the cured resin and the cell wall is stronger than the restoring force of the wood (and the strength of the cured resin must also be sufficiently strong), the resin and cell wall will remain in close contact even after decompression. In order to maintain its pristine condition, the entire surface becomes transparent and the wood grain becomes unclear. In general, the density difference between the spring wood and summer wood of coniferous trees is large, with the summer wood being higher than the spring wood. For this reason, the restoring force after compaction is much smaller in the spring wood than in the summer wood. Therefore, by adding an adhesion reducing agent to the synthetic resin liquid, the adhesion between the cured resin and the cell wall can be adjusted to the restoring force of the springwood cells.
If set between the restoring forces of the material and cells, it will be clamped.

After heating, the summerwood part restores itself freely, causing separation between the cured resin and the cell walls, creating spaces that cause diffuse reflection of light, making it white and opaque. On the other hand, in the spring wood part, the adhesion force is stronger than the restoring force, so the cured resin and the cell wall remain in close contact with each other, so the wood color is added and the wood color exists in a darkened and transparent state. Therefore, it is possible to obtain a clear wood grain pattern with clear shading in the spring wood portion and the summer wood portion.

Furthermore, as discussed above, in wood species where the natural white, yellow, and red colors of wood are prized, a large amount of adhesion is applied so that the adhesion force between the hardened resin and the cell wall is less than the restoring force of the spring wood cells. If a treatment agent to reduce the strength, that is, an adhesion reducing agent is added, everything from the spring wood to the summer wood will be restored, forming spaces between the cured resin and the cell walls, and the entire surface will become white. Because it is made opaque, it is also possible to obtain a so-called white wood-like appearance, which retains the color tone of the material before injection. As described above, in the present invention, it is possible to obtain a desired appearance by adjusting the adhesion between the cured resin and the cell wall by adjusting the amount of the adhesion reducing agent. In addition, encouraging the free restoration of cells relieves residual stress,
It is also effective as a measure to prevent cracking and deformation.

The inventors have discovered that it is extremely effective to blend a polyester polymer plasticizer as an adhesion reducing agent for the unsaturated polyester resin in the present invention. When selecting a polyester polymer plasticizer, one that has good compatibility with the unsaturated polyester resin used is suitable from the viewpoint of workability. About the addition foot is approximately 10
~40% is appropriate, but since the restoring force of wood varies depending on various factors such as the type of wood and the crushing pressure, it is desirable to conduct a preliminary test in advance to determine the amount of wood to be added. Furthermore, the combined use of a low-molecular plasticizer such as DBP or a desiliconizing agent such as silicone is effective in promoting the adhesion-lowering function of the polyester-based polymer plasticizer. In addition, there is no problem in adding a surfactant, a reaction accelerator, a reaction inhibitor, a reaction inhibitor, a flame retardant, and the like. In addition, since the surface of the synthetic resin injection-treated wood according to the present invention has a gate protrusion similar to the wood grain pattern due to restoration, it is not possible to smooth the surface by sanding or the like and then cover it with an appropriate material. Desirable for aesthetics and surface protection.

Next, examples of the present invention and comparative examples will be shown.

Example 1 A sliced straight-grained veneer of 0.6-thick rice chestnut wood was dried for 5 hours.
g for 2 hours, 100 parts of unsaturated polyester resin (alkyd: styrene = 65785), 10 parts of polyester polymer plasticizer, and 5 parts of DBP.

After injecting a mixed resin solution containing npoZ part and 0.2 parts of hydroquinone, the resin solution-injected veneer was placed on a plywood coated with an a-olefin adhesive and heated at 10 K using a hot press.
The resin liquid injected veneer was cured and bonded by heating at 140° C. for one portion under a pressure of t7d. In the thus obtained unsaturated polyester resin injection-treated rice chestnut wood, the spring wood remains dark and transparent, but only the summer wood has been restored and has become white and opaque. Although it was the opposite of the shading of summer wood, a natural and clear wood grain pattern was obtained that did not give any impression of it.

Comparative example 1゜Example 1. Unsaturated polyester resin (alkyd: styrene = 65:85) 10
0 parts, 5 parts of DBP, 4 parts of BPO, 0 parts of hydroquinone
．． A mixed resin solution containing 2 parts was injected and cured. The thus obtained unsaturated polyester resin injection-treated rice chestnut wood had a deep color and a transparent appearance in both the spring wood and summer wood, and the wood grain was unclear throughout.

Example 2 After drying a sliced grain veneer of scrap wood with a cod thickness of 0.6°, Example 1. Under the same conditions as above, 100 parts of unsaturated polyester resin (alkyd: styrene = 65: 85),
20 parts of polyester polymer plasticizer, 5 parts of DBP, np
A mixed resin solution containing 0.2 parts of hydroquinone and 0.2 parts of hydroquinone was injected and cured.

The thus obtained unsaturated polyester resin injection-treated waste wood becomes opaque in both the spring and summer wood parts, and the whiteness of the cypress material is reduced.
A so-called plain wood-like appearance with yellow and red tinges was obtained.

Comparative example 2゜ Example 2. A veneer similar to Comparative Example 1. Same conditions as.

Injected and cured with the same resin.

The obtained unsaturated polyester resin injection-treated scrap material turned yellow and transparent as a whole, and its appearance was completely different from the original color tone.

[Brief explanation of the drawing]

Figure 1 shows Comparative Example 1. FIG. 2 is an explanatory diagram of the processing of the cross section of the butt end in Embodiment 1 of the present invention. FIG. 8 is an explanatory diagram of the processing of the cross section of the butt end shown in FIG.
The figure shows an example of the present invention, and is a schematic diagram of one cell showing a state in which the cell becomes transparent due to close contact. a...Summer wood part b...Spring wood part C...Base material d...Cell wall e...Curing resin f...Vacancy procedure amendment (voluntary) 1. Indication of the case Relationship to the 1937 Patent Application No. 197984 Patent applicant 5 Date of amendment order Voluntary 6 Number of inventions increased by amendment 0 As shown in the attached sheet 8 Contents of amendment (1) Patent claim The full text of the scope has been corrected as shown in the attached sheet. (2) From line 15 to line 16 on page 4 of the specification [(It is also necessary that the strength of the cured resin is sufficiently strong) J is deleted. (3) On page 7, line 15 of the specification, "0.2 part of hydroquinone" is corrected to "0.02 part of hydroquinone." (4) On page 7, line 16 of the specification, ``the resin liquid injected veneer'' is corrected to ``the resin paper injected veneer.'' (5) On page 7, line 17 of the specification. "...adhesive-coated plywood..." is corrected to "...adhesive-coated plywood (0)...". (6) In the first line of page 8 of the specification, "spring wood section" is written. (7) In the second line of page 8 of the specification, the phrase "summer wood section" is corrected to "summer wood section (a)." (8) On page 8 of the specification tube, line 10, the words ``...0.2 parts'' are corrected to ``...0.02 parts''. ” In the second line from the bottom of page 8 of the specification for “Injection-treated rice hemp wood,” the phrase “…0.2 parts” is corrected to “…α0.2 parts.”Ov In the third line from the bottom of page 9 of the specification, insert ``1...Resin-injected veneer Y...Injection-treated rice toga wood'' between ``This is a schematic diagram of the cell.'' and ``A...Summer wood portion.'' (Attachment included) Scope of Claims: ■ In the production of unsaturated polyester-based synthetic resin injection-treated wood that is simultaneously cured and bonded to a base material by pressing and heating, the cells of the injected coniferous straight-grained and thin-grained boards are A method for producing synthetic resin injection-treated wood characterized by reducing the adhesion between the cell wall and the cured resin in accordance with the restoring force after pressing and heating. A treatment agent for synthetic resin injection-treated wood characterized by containing a polyester-based polymer tlltli agent to reduce the adhesion between the cell wall and the cured resin.''

Claims (1)

[Claims] ■ In the production of unsaturated polyester-based synthetic resin injection-treated wood that is simultaneously cured and adhered to the base material by pressing and heating, the cells of the injected coniferous straight-grained and thin-grained boards are compressed and heated. A method for producing synthetic resin injection-treated wood characterized by reducing the adhesion between a thin #I wall and a cured resin in accordance with the restoring force. ■ Synthesis characterized by adding a low ring astringency imparting agent such as a polyester polymer plasticizer to the unsaturated polyester resin used in the synthetic resin injection process in order to reduce the adhesion between the cell wall and the cured resin. A treatment agent for resin injection treated wood.