JPH08269425A - Wood adhesive - Google Patents
Wood adhesiveInfo
- Publication number
- JPH08269425A JPH08269425A JP9610295A JP9610295A JPH08269425A JP H08269425 A JPH08269425 A JP H08269425A JP 9610295 A JP9610295 A JP 9610295A JP 9610295 A JP9610295 A JP 9610295A JP H08269425 A JPH08269425 A JP H08269425A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- compound
- diisocyanate
- amino
- melamine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Veneer Processing And Manufacture Of Plywood (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、木材用接着剤の耐水
性を向上させる技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the water resistance of an adhesive for wood.
【０００２】[0002]
【従来の技術】木材用接着剤には、例えば合板等の木質
板製造用として尿素ホルムアルデヒド樹脂接着剤、尿素
メラミン共縮合樹脂接着剤、メラミン樹脂接着剤等が周
知である。これらの接着剤は、原料である尿素やメラミ
ンがアミノ基を有することからアミノ樹脂系接着剤とよ
ばれている。アミノ樹脂系接着剤は、比較的硬化速度が
速く、また、増量剤として小麦粉や木粉等の安価な材料
を接着力を低下させないで使用することができ、グルー
コストの節減も図ることができるものである。2. Description of the Related Art Urea-formaldehyde resin adhesives, urea-melamine co-condensation resin adhesives, melamine resin adhesives, etc. are well known as adhesives for wood, for example, for producing wood boards such as plywood. These adhesives are called amino resin adhesives because the raw materials urea and melamine have amino groups. Amino resin-based adhesives have a relatively high curing speed, and inexpensive materials such as wheat flour and wood flour can be used as an extender without reducing the adhesive strength, and the glue cost can be reduced. It is a thing.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記のアミ
ノ樹脂系接着剤、とりわけ尿素ホルムアルデヒド樹脂接
着剤、尿素メラミン共縮合樹脂接着剤等は樹脂自身の硬
化後の耐水性に欠ける等の理由により耐水性に乏しいと
いう欠点があった。この発明は、これらのアミノ樹脂系
接着剤の接着力等の諸性能を維持しつつ耐水性を飛躍的
に向上させることのできる技術を提供することを目的と
している。However, the above-mentioned amino resin adhesives, particularly urea formaldehyde resin adhesives, urea melamine co-condensation resin adhesives, etc., are water-resistant due to lack of water resistance after curing of the resin itself. It had the disadvantage of poor sex. It is an object of the present invention to provide a technique capable of dramatically improving water resistance while maintaining various performances such as adhesive strength of these amino resin adhesives.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するため
に、この発明では尿素やメラミン等のアミノ基を有する
化合物を主成分とする接着剤にイソシアネート基を有す
る化合物を添加する手段を採用する。In order to solve the above-mentioned problems, the present invention adopts means for adding a compound having an isocyanate group to an adhesive containing a compound having an amino group such as urea or melamine as a main component. .
【０００５】アミノ基を有する化合物としては、尿素、
メラミン、グアナミン、アニリン、スルホンアミド、チ
オ尿素があげられる。アルデヒドとしては一般に利用さ
れているホルムアルデヒドを使用する。反応過程として
は、ホルムアルデヒドとアミノ化合物とを反応させ、窒
素原子にホルムアルデヒドが付加したメチロール化合物
を生成させる。このメチロール化合物中間体を酸または
熱によって縮合させ、三次元構造を持った硬化物とす
る。As the compound having an amino group, urea,
Examples include melamine, guanamine, aniline, sulfonamide, and thiourea. As the aldehyde, commonly used formaldehyde is used. In the reaction process, formaldehyde is reacted with an amino compound to form a methylol compound in which formaldehyde is added to a nitrogen atom. The methylol compound intermediate is condensed with an acid or heat to obtain a cured product having a three-dimensional structure.
【０００６】これに添加するイソシアネート基を有する
化合物（−ＮＣＯ）は、常温では固体で溶剤に溶解した
状態で用いられ、極性の高さから反応性に優れ、特にＯ
Ｈ基として重付加反応による結合を生じるものである。
化合物としては、Ｐ−フェニレンジイソシアネート、ヘ
キサメチレンジイソシアネート、トルエンジイソシアネ
ート、１−クロロフェニルジイソシアネート、エチルベ
ンゼン−α２−ジイソシアネート等の有機化合物が用い
られる。The compound having an isocyanate group (-NCO) to be added thereto is used in a state of being solid at room temperature and dissolved in a solvent, and it is excellent in reactivity due to its high polarity.
The H group causes a bond by a polyaddition reaction.
As the compound, organic compounds such as P-phenylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, 1-chlorophenyl diisocyanate and ethylbenzene-α2-diisocyanate are used.
【０００７】[0007]
【作用】この発明によれば、アミノ基を有する化合物を
主成分とする接着剤にイソシアネート基を有する化合物
を添加したので、接着剤中の水素や木材中のＯＨ基と化
学結合を生成するという作用を生じる。According to the present invention, a compound having an isocyanate group is added to an adhesive containing a compound having an amino group as a main component, so that a chemical bond is formed with hydrogen in the adhesive and OH groups in wood. Produce an effect.
【０００８】[0008]
【実施例】常用の尿素ホルムアルデヒド樹脂接着剤と、
この尿素ホルムアルデヒド樹脂接着剤１００部に対して
イソシアネート樹脂を５部添加して混合した２種類の木
材用接着剤を準備した。これらの接着剤を用いて厚さ１
２ｍｍの５プライ合板を常法にて得た。そして、これら
の合板の耐水性および接着剤の接着力を確認するため、
ＪＡＳ Ｉ類 特類試験で実施した。結果は表１のとお
りであった。このように、この発明では接着力は従来と
おりの性能を維持しつつ耐水性を大幅に向上させること
がわかる。[Example] A conventional urea-formaldehyde resin adhesive,
Two kinds of wood adhesives were prepared by adding 5 parts of isocyanate resin to 100 parts of this urea formaldehyde resin adhesive and mixing them. Thickness 1 with these adhesives
A 2-mm 5-ply plywood was obtained by a conventional method. And to confirm the water resistance of these plywood and the adhesive strength of the adhesive,
JAS Type I Special test was conducted. The results are shown in Table 1. As described above, in the present invention, it is understood that the adhesive strength significantly improves the water resistance while maintaining the conventional performance.
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【発明の効果】この発明によれば、アミノ基を有する化
合物を主成分とする接着剤にイソシアネート基を有する
化合物を添加したので、接着剤中の水素や木材中のＯＨ
基と化学結合を生成しながら高分子化するという作用を
生じる。According to the present invention, a compound having an isocyanate group is added to an adhesive containing a compound having an amino group as a main component. Therefore, hydrogen in the adhesive or OH in wood is used.
It produces the action of polymerizing while forming a chemical bond with the group.
【００１１】したがって、接着剤自体の耐水性が著しく
向上されるので、合板等の木質板を製造する際にこの発
明の接着剤を用いることにより、耐水性に優れる木質板
を得ることができるものである。Therefore, since the water resistance of the adhesive itself is remarkably improved, a wood board having excellent water resistance can be obtained by using the adhesive of the present invention when manufacturing a wood board such as plywood. Is.
Claims (1)
合物を主成分とする接着剤にイソシアネート基を有する
化合物が添加されていることを特徴とする木材用接着
剤。1. An adhesive for wood, wherein a compound having an isocyanate group is added to an adhesive containing a compound having an amino group such as urea or melamine as a main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9610295A JPH08269425A (en) | 1995-03-28 | 1995-03-28 | Wood adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9610295A JPH08269425A (en) | 1995-03-28 | 1995-03-28 | Wood adhesive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08269425A true JPH08269425A (en) | 1996-10-15 |
Family
ID=14156033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9610295A Pending JPH08269425A (en) | 1995-03-28 | 1995-03-28 | Wood adhesive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08269425A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000036020A1 (en) * | 1998-12-17 | 2000-06-22 | Bayer Corporation | Extended polymethylene poly(phenylisocyanate) resin binders for the production of wood composite products |
-
1995
- 1995-03-28 JP JP9610295A patent/JPH08269425A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000036020A1 (en) * | 1998-12-17 | 2000-06-22 | Bayer Corporation | Extended polymethylene poly(phenylisocyanate) resin binders for the production of wood composite products |
| US6224800B1 (en) | 1998-12-17 | 2001-05-01 | Bayer Corporation | Extended polymethylene poly(phenylisocyanate) resin binders for the production of wood composite products |
| AU748481B2 (en) * | 1998-12-17 | 2002-06-06 | Bayer Corporation | Extended polymethylene poly(phenylisocyanate) resin binders for the production of wood composite products |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040309 |