JPH0711221A - Adhesive - Google Patents
AdhesiveInfo
- Publication number
- JPH0711221A JPH0711221A JP15512993A JP15512993A JPH0711221A JP H0711221 A JPH0711221 A JP H0711221A JP 15512993 A JP15512993 A JP 15512993A JP 15512993 A JP15512993 A JP 15512993A JP H0711221 A JPH0711221 A JP H0711221A
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- Prior art keywords
- resin
- condensation
- adhesive
- emulsion
- degree
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、突き板合板、合板、紙
管等の製造に使用する接着剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive used for manufacturing veneer plywood, plywood, paper tubes and the like.
【0002】[0002]
【従来の技術】突き板合板、合板、紙管等を製造する際
に用いる接着剤として、酢酸ビニル樹脂エマルジョン、
エチレン・酢酸ビニル樹脂エマルジョン、スチレン・ブ
タジエン共重合エマルジョン等の合成樹脂エマルジョン
に、尿素・ホルムアルデヒド縮合樹脂、メラミン・ホル
ムアルデヒド縮合樹脂等のアミノ樹脂を使用直前に配合
混合したものが、合成樹脂エマルジョンの良好な仮接着
性およびアミノ樹脂の耐水性がうまく発揮できることか
ら広く使用されている。2. Description of the Related Art Vinyl acetate resin emulsions are used as adhesives when manufacturing veneer plywood, plywood, paper tubes, etc.
Synthetic resin emulsions such as ethylene / vinyl acetate resin emulsions and styrene / butadiene copolymer emulsions, and amino resins such as urea / formaldehyde condensation resin and melamine / formaldehyde condensation resin mixed and mixed immediately before use are good synthetic resin emulsions. It is widely used because of its good temporary adhesion and good water resistance of amino resin.
【0003】[0003]
【発明が解決しようとする課題】しかしこの混合方法
は、両者の最適混合条件が確立されておらず、相溶性不
良の場合は、分離・増粘する事がしばしば起き、接着力
が十分に得られないので、通常は使用直前に混合使用さ
れている。そのため、使用に際しては均一に混合するた
めに少量を頻繁に配合する必要がある。また、貯蔵安定
性に優れる一液混合型の接着剤を得ることは困難であっ
た。However, in this mixing method, the optimum mixing conditions for the two have not been established, and when compatibility is poor, separation and thickening often occur, and sufficient adhesive strength is obtained. Therefore, it is usually used as a mixture just before use. Therefore, in use, it is necessary to frequently mix a small amount in order to mix uniformly. Further, it has been difficult to obtain a one-component mixed type adhesive having excellent storage stability.
【0004】[0004]
【課題を解決するための手段】本発明者らは、これらの
問題点を解決するため鋭意研究した結果、アミノ樹脂の
縮合度(樹脂濃度10重量%の水溶液の白濁温度で判定
する。後述)が合成樹脂エマルジョンとの相溶性におい
て重要な影響を及ぼすことを見出し、本発明を完成し
た。Means for Solving the Problems As a result of intensive studies for solving these problems, the present inventors have determined the degree of condensation of amino resin (determined by the cloudiness temperature of an aqueous solution having a resin concentration of 10% by weight, which will be described later). The present invention has been completed based on the finding that is important for compatibility with synthetic resin emulsions.
【0005】即ち、本発明は、縮合度が5〜30℃であ
るアミノ樹脂と合成樹脂エマルジョンからなることを特
徴とするエマルジョン−アミノ樹脂系接着剤である。That is, the present invention is an emulsion-amino resin type adhesive characterized in that it comprises an amino resin having a condensation degree of 5 to 30 ° C. and a synthetic resin emulsion.
【0006】以下本発明について詳述する。合成樹脂エ
マルジョンとして、酢酸ビニル樹脂エマルジョン、エチ
レン・酢酸ビニル樹脂エマルジョン、スチレン・ブタジ
エン共重合エマルジョン、アクリルエステル樹脂系エマ
ルジョン、塩化ビニル樹脂系マルジョン、塩化ビニリデ
ン樹脂系エマルジョン、ポリスチレンエマルジョン、ポ
リエチレンエマルジョン、ポリブテンエマルジョンなど
が挙げられる。The present invention will be described in detail below. Synthetic resin emulsions include vinyl acetate resin emulsion, ethylene / vinyl acetate resin emulsion, styrene / butadiene copolymer emulsion, acrylic ester resin emulsion, vinyl chloride resin emulsion, vinylidene chloride resin emulsion, polystyrene emulsion, polyethylene emulsion, polybutene emulsion. And so on.
【0007】アミノ樹脂としては、一般的に、尿素・ホ
ルムアルデヒド縮合樹脂、メラミン・ホルムアルデヒド
縮合樹脂、アニリンアルデヒド縮合樹脂などが挙げられ
る。アミノ樹脂の製造方法としては、尿素・ホルムアル
デヒド縮合樹脂の場合を例に挙げると、ホルムアルデヒ
ドと尿素のモル比を2〜3:1比としpHをNaOHに
より約8. 0に調整し、温度を80〜95℃に保ち30
分程度反応させたのち蟻酸にてpHを約4. 5にして約
10分間反応を行い、次いでNaOHでpHを4.8〜
6.0とした後、ホルムアルデヒドと尿素のモル比を1
〜2:1比になるように尿素を追加し、溶解させ、さら
に反応を縮合度が所定の温度になるまで行い、さらにN
aOHでpHを約8としたのちに常温になるまで冷却を
行うのが一般的である。Examples of the amino resin generally include urea / formaldehyde condensation resin, melamine / formaldehyde condensation resin, aniline aldehyde condensation resin and the like. As a method for producing the amino resin, taking the case of a urea-formaldehyde condensation resin as an example, the molar ratio of formaldehyde and urea is 2-3: 1, the pH is adjusted to about 8.0 with NaOH, and the temperature is adjusted to 80%. Keep at ~ 95 ℃ 30
After reacting for about a minute, the pH is adjusted to about 4.5 with formic acid and the reaction is performed for about 10 minutes, and then the pH is adjusted to 4.8 to about 4 with NaOH.
After setting to 6.0, the molar ratio of formaldehyde to urea is 1
Urea is added and dissolved in a ratio of up to 2: 1 and the reaction is further carried out until the condensation degree reaches a predetermined temperature.
It is common to adjust the pH to about 8 with aOH and then cool to room temperature.
【0008】メラミン・ホルムアルデヒド縮合樹脂の場
合は、ホルムアルデヒドとメタノールとメラミンのモル
比を1. 5〜4. 5:1〜5:1比とし、pHをNaO
Hにより10〜13に調整し、温度を80〜90℃に保
ち、この時の縮合度を所定の程度になる迄反応を進めた
のち速やかに常温になるまで冷却を行うのが一般的であ
る。In the case of the melamine-formaldehyde condensation resin, the molar ratio of formaldehyde, methanol and melamine is 1.5 to 4.5: 1 to 5: 1 and the pH is NaO.
It is common to adjust to 10 to 13 with H, maintain the temperature at 80 to 90 ° C., proceed the reaction until the degree of condensation at this time reaches a predetermined degree, and then quickly cool to room temperature. .
【0009】アミノ樹脂の縮合度を測定することは種々
の縮合程度のものの混合物であるため困難であり、平均
的な縮合度の尺度として、水溶液での白濁温度を用いる
ことが便利である。本発明では、後述する測定方法で測
定した樹脂濃度10重量%の水溶液の白濁温度を縮合度
とする。It is difficult to measure the degree of condensation of the amino resin because it is a mixture of various degrees of condensation, and it is convenient to use the cloudiness temperature in an aqueous solution as a measure of the average degree of condensation. In the present invention, the degree of condensation is defined as the cloudiness temperature of an aqueous solution having a resin concentration of 10% by weight measured by the measuring method described later.
【0010】本発明で用いるアミノ樹脂は縮合度が30
℃以下のものが好ましく、通常5〜30℃のものであ
る。なお、上記のように製造したアミノ樹脂では通常ア
ミノ基1モルに対するホルムアルデヒドの量は0.5〜
1.5モルの条件で得られるものである。The amino resin used in the present invention has a condensation degree of 30.
It is preferably not higher than 0 ° C, usually 5 to 30 ° C. In addition, in the amino resin produced as described above, the amount of formaldehyde is usually 0.5 to 1 mol of amino group.
It is obtained under the condition of 1.5 mol.
【0011】合成樹脂エマルジョンとの相溶性は、上記
条件にあるアミノ樹脂ではいずれの割合においても良好
であり、配合時に混合しても良いし、あらかじめアミノ
樹脂と合成樹脂エマルジョンとを混合しても良い。あら
かじめ混合する場合は、アミノ樹脂の反応を防止するた
め、一般的な酸又は、アルカリでpHを7〜10に調整
することにより長期間にわたり分離、増粘を起こさず安
定性に優れる接着剤を得ることができる。アミノ樹脂の
縮合度が30℃を越えると合成樹脂エマルジョンとのい
ずれの混合割合においても相溶性が悪くなり、接着され
た突き板合板、合板、紙管、等の接着力が不安定とな
り、実用的でなくなる。また、アミノ樹脂の縮合度が4
℃以下である場合は、合成樹脂エマルジョンとの相溶性
は良いが接着力が十分でなくなり実用的でなくなる。The compatibility with the synthetic resin emulsion is good in any proportion of the amino resin under the above conditions, and they may be mixed at the time of compounding, or the amino resin and the synthetic resin emulsion may be mixed in advance. good. In case of pre-mixing, in order to prevent the reaction of amino resin, by adjusting the pH to 7 to 10 with a general acid or alkali, an adhesive with excellent stability that does not cause separation or thickening over a long period of time is prepared. Obtainable. If the degree of condensation of the amino resin exceeds 30 ° C, the compatibility will be poor at any mixing ratio with the synthetic resin emulsion, and the adhesive strength of the bonded veneer plywood, plywood, paper tube, etc. will become unstable, making it practical. It becomes untargetable. Also, the condensation degree of the amino resin is 4
When the temperature is lower than 0 ° C, the compatibility with the synthetic resin emulsion is good, but the adhesive strength is insufficient and it becomes unpractical.
【0012】[0012]
【実施例】以下、実施例、比較例によりさらに詳細に説
明するが本発明は、これらに限定されるものではない。EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
【0013】評価方法 (A)アミノ樹脂の縮合度の測定方法 100mlのメスシリンダーに樹脂重量濃度が10%に
なるように樹脂と蒸留水を加え、約100mlとする。
速やかに温度計で水と樹脂が良く混和するようにかき混
ぜる。この液の色相が、白濁した場合は加温水槽、透明
の場合は冷却水槽で、メスシリンダー内の液がわずかに
濁りを生じるように温度を調整する。この時の温度を読
みとり縮合度とする。Evaluation Method (A) Method for Measuring Condensation Degree of Amino Resin Resin and distilled water are added to a 100 ml graduated cylinder so that the weight concentration of the resin is 10%, and the volume is set to about 100 ml.
Immediately stir with a thermometer so that the water and resin mix well. When the hue of this liquid becomes cloudy, the temperature is adjusted so that the liquid in the graduated cylinder becomes slightly turbid by using a warm water tank or a transparent water tank. The temperature at this time is read and used as the condensation degree.
【0014】(B)相溶性およびポットライフ(PL)
のテスト方法 ユリア樹脂木材接着剤JIS K 6801−1987 に
規定される3.酢ビ混和性試験に準じて測定した。相溶
性の判定は、分離、増粘等が無く優れており、実用範囲
にあるものを○、実用的でないものを×と示した。ま
た、25℃で14日間保存し、分離、増粘等の有無を調
べた。ポットライフの判定は、分離、増粘が無く優れて
おり、実用範囲にあるものを○、実用的でないものを×
と示した。(B) Compatibility and pot life (PL)
2. Test method of urea resin wood adhesive specified in JIS K 6801-1987. It was measured according to the vinyl acetate compatibility test. The compatibility was judged to be excellent without separation, thickening, etc., and those within the practical range were marked with ◯, and those not practical were marked with x. Further, it was stored at 25 ° C. for 14 days, and the presence or absence of separation or thickening was examined. Judgment of pot life is excellent without separation and thickening, and is in the practical range ○, unpractical ×
Was shown.
【0015】(C)合板接着力の測定方法 ユリア樹脂木材接着剤JIS K 6801−1987 に
規定される6.7.2木材引張せん断接着強さに準じて
測定した。(C) Plywood adhesive strength measurement method Uria resin wood adhesive It was measured according to 6.7.2 wood tensile shear adhesive strength specified in JIS K 6801-1987.
【0016】(D)総合評価の方法 どの混合比条件においても相溶性、合板接着力が優れて
おり、ポットライフも良好で、実用範囲にあるものを
○、実用的でないものを×と示した。(D) Method of Comprehensive Evaluation Excellent compatibility, plywood adhesiveness, and good pot life under any mixing ratio condition, and those in the practical range were marked with ◯, and those not practical were marked with x. .
【0017】実施例1 2リットルのフラスコに37%ホルムアルデヒド720
gと尿素266. 4gを入れ、20%NaOH水溶液に
よりpHを約8に調整し、温水浴により80〜95℃で
30分間反応させたのち、蟻酸にてpHを約4. 5にし
て約10分間反応を行い、次いで20%NaOH水溶液
によりpHを約5.2としてから尿素18.5gを追加
し、溶解し、さらに、縮合度が5℃迄になるまで反応を
進め、次いで20%NaOH水溶液によりpHを約8と
したのち徐々に常温になるまで冷却を行った。このアミ
ノ樹脂液の固形分は50重量%であり、縮合度は5℃で
あった。ここで得られたアミノ樹脂液と三井東圧化学
(株)製の酢酸ビニル樹脂エマルジョン「ストラクトボ
ンドV−222」(商品名、固形分約40%、pH約
4、粘度約30000CP/25℃)とを混合し、相溶
性とPLと合板接着力を調べた。エマルジョンはあらか
じめ20%NaOH水溶液によりpHを約8に調整した
後アミノ樹脂液と混合した。なお、アミノ樹脂/エマル
ジョンの混合割合は重量比で25/75、50/50お
よび75/25である。測定結果を表1に示す。Example 1 37% formaldehyde 720 in a 2 liter flask
g and urea (266.4 g) were added, the pH was adjusted to about 8 with a 20% aqueous NaOH solution, the mixture was reacted in a warm water bath at 80 to 95 ° C. for 30 minutes, and then the pH was adjusted to about 4.5 with formic acid to about 10 After reacting for 20 minutes, the pH was adjusted to about 5.2 with a 20% NaOH aqueous solution, 18.5 g of urea was added and dissolved, and the reaction was allowed to proceed until the degree of condensation reached 5 ° C., then a 20% NaOH aqueous solution. The pH was adjusted to about 8 and then gradually cooled to room temperature. The solid content of this amino resin solution was 50% by weight, and the degree of condensation was 5 ° C. The amino resin solution obtained here and a vinyl acetate resin emulsion "Structobond V-222" manufactured by Mitsui Toatsu Chemicals, Inc. (trade name, solid content about 40%, pH about 4, viscosity about 30,000 CP / 25 ° C) Were mixed, and compatibility, PL and plywood adhesion were examined. The emulsion was previously adjusted to a pH of about 8 with a 20% NaOH aqueous solution and then mixed with the amino resin solution. The mixing ratio of the amino resin / emulsion is 25/75, 50/50 and 75/25 by weight. The measurement results are shown in Table 1.
【0018】実施例2〜4 縮合度をそれぞれ10℃、20℃、30℃なるまで反応
を進めた以外は、実施例1と同様にしてアミノ樹脂液を
製造した。得られたアミノ樹脂の固形分は実施例1と同
じであったが、縮合度はそれぞれ10℃、20℃、30
℃であった。以下、実施例1と同様に相溶性とPLと合
板接着力を調べた。その結果を表1に示す。Examples 2 to 4 Amino resin solutions were produced in the same manner as in Example 1 except that the reaction was allowed to proceed until the condensation degree reached 10 ° C, 20 ° C and 30 ° C, respectively. The solid content of the obtained amino resin was the same as in Example 1, but the condensation degrees were 10 ° C., 20 ° C. and 30 ° C., respectively.
It was ℃. Hereinafter, the compatibility, PL and plywood adhesive strength were examined in the same manner as in Example 1. The results are shown in Table 1.
【0019】比較例1〜4 実施例1において、反応の縮合度をそれぞれ2℃、40
℃、50℃、60℃になるまで反応を進めた以外は、実
施例1と同様にして、アミノ樹脂液を得た。各樹脂の固
形分、縮合度はそれぞれ50重量%・2℃、50重量%
・40℃、50重量%・50℃、50重量%・60℃で
あった。以下、実施例1と同様に評価をし、表2に示し
た。Comparative Examples 1 to 4 In Example 1, the degree of condensation of the reaction was 2 ° C. and 40, respectively.
An amino resin solution was obtained in the same manner as in Example 1 except that the reaction was allowed to proceed to 50 ° C, 50 ° C, and 60 ° C. The solid content and condensation degree of each resin are 50% by weight, 2 ° C and 50% by weight, respectively.
-It was 40 degreeC, 50 weight% -50 degreeC, 50 weight% -60 degreeC. Hereinafter, the evaluation was performed in the same manner as in Example 1 and shown in Table 2.
【0020】[0020]
【表1】 (注) PL:ポットライフ。 UF:尿素・ホルムアル
デヒド樹脂。PVAc:酢酸ビニル樹脂エマルジョン。
縮合度:単位 ℃。 強度:単位 kgf/cm2。[Table 1] (Note) PL: Pot life. UF: Urea / formaldehyde resin. PVAc: Vinyl acetate resin emulsion.
Degree of condensation: Unit: ° C. Strength: Unit kgf / cm 2 .
【0021】[0021]
【表2】 [Table 2]
【0022】実施例5 2リットルのフラスコに、37%ホルムアルデヒド72
0g、メタノール198. 9gとメラミン559gを入
れ、20%NaOH水溶液によりpHを10〜13に調
整し、温水浴にて80〜90℃に保ち、縮合度が20℃
になったところで速やかに常温になるまで冷却した。こ
のアミノ樹脂液の固形分は58重量%であり、縮合度は
20℃であった。以下、実施例1と同様に相溶性SとP
Lと合板接着力を調べた。その結果を表3に示す。Example 5 A 2 liter flask was charged with 72% 37% formaldehyde.
0 g, 198.9 g of methanol and 559 g of melamine were added, the pH was adjusted to 10 to 13 with a 20% aqueous NaOH solution, the temperature was maintained at 80 to 90 ° C in a warm water bath, and the degree of condensation was 20 ° C.
When it became, it was quickly cooled to room temperature. The solid content of this amino resin liquid was 58% by weight, and the degree of condensation was 20 ° C. Hereinafter, as in Example 1, the compatibility S and P
The adhesive force between L and plywood was examined. The results are shown in Table 3.
【0023】実施例6、7 実施例3において、合成樹脂エマルジョンを住友化学
(株)製エチレン酢酸ビニル樹脂エマルジョン「S−4
60」(商品名、固形分約60%、pH約4、粘度約6
500CP/25℃)または三井東圧化学(株)製のス
チレン・ブタジエン共重合樹脂エマルジョン「ストラク
トボンドSB−1021」(商品名、固形分約49%、
pH約4、粘度約70CP/25℃)を使用した以外
は、同様の評価を行った。その結果を表3に示す。Examples 6 and 7 In Example 3, the synthetic resin emulsion was replaced by Sumitomo Chemical Co., Ltd. ethylene vinyl acetate resin emulsion "S-4".
60 "(brand name, solid content about 60%, pH about 4, viscosity about 6
500 CP / 25 ° C.) or a styrene-butadiene copolymer resin emulsion “Structobond SB-1021” manufactured by Mitsui Toatsu Chemicals, Inc. (trade name, solid content about 49%,
The same evaluation was performed except that a pH of about 4 and a viscosity of about 70 CP / 25 ° C.) were used. The results are shown in Table 3.
【0024】[0024]
【表3】 (注) MF:メラミン・ホルムアルデヒド樹脂。EV
A:エチレン・酢酸ビニル樹脂エマルジョン。SBR:
スチレン・ブタジエン共重合樹脂エマルジョン。[Table 3] (Note) MF: Melamine / formaldehyde resin. EV
A: Ethylene / vinyl acetate resin emulsion. SBR:
Styrene / butadiene copolymer emulsion.
【0025】[0025]
【発明の効果】以上に明らかなように、本発明の接着剤
はアミノ樹脂と合成樹脂エマルジョンとが均一に混合し
ており、ポットライフも十分であり、むらのない良好な
接着力が得られる。As is apparent from the above, the adhesive of the present invention is obtained by uniformly mixing the amino resin and the synthetic resin emulsion, has a sufficient pot life, and can obtain good adhesive strength without unevenness. .
Claims (1)
と合成樹脂エマルジョンからなることを特徴とするエマ
ルジョン−アミノ樹脂系接着剤。1. An emulsion-amino resin adhesive, comprising an amino resin having a degree of condensation of 5 to 30 ° C. and a synthetic resin emulsion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15512993A JPH0711221A (en) | 1993-06-25 | 1993-06-25 | Adhesive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15512993A JPH0711221A (en) | 1993-06-25 | 1993-06-25 | Adhesive |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0711221A true JPH0711221A (en) | 1995-01-13 |
Family
ID=15599193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15512993A Pending JPH0711221A (en) | 1993-06-25 | 1993-06-25 | Adhesive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0711221A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104277748A (en) * | 2014-10-31 | 2015-01-14 | 浙江红高梁木业有限公司 | High-temperature-resistant wood floor nano adhesive and preparation method thereof |
-
1993
- 1993-06-25 JP JP15512993A patent/JPH0711221A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104277748A (en) * | 2014-10-31 | 2015-01-14 | 浙江红高梁木业有限公司 | High-temperature-resistant wood floor nano adhesive and preparation method thereof |
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