JP2000328030A - Two-component, separate-coating, fast-curing aqueous adhesive - Google Patents

Abstract

(57) Abstract: an aqueous solution of a synthetic Takako compound having an imide group (-CO) ₂ NH structure in the molecule, in honeymoon adhesive formulated with a carboxylated rubber latex, conventionally least equivalent It has an initial bond strength and excellent mixing stability, exhibits phenomenal storage stability over a long period of one year or more, and has an open assembly time (JIS)
K 6800) is provided. SOLUTION: Liquid A has an imide group (-CO) in the molecule.
_The upper limit is 10 parts by weight of a rubber latex having both a hydroxyl group and a carboxyl group in a molecule as a solid content with respect to an aqueous solution of a synthetic polymer compound having a ₂ NH ₂ structure and 1 part by weight as a solid content of the aqueous solution. An aqueous adhesive obtained by mixing in the above range, and a two-liquid fractionally coated quick-curing adhesive composition using a polyaldehyde aqueous solution as the B liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a liquid A to one of the surfaces to be bonded at the time of bonding.
A two-liquid separation coating speed that applies instantaneously and exerts excellent initial adhesive strength in a very short time by applying the liquid B to the other adhered surface and bonding and pressing the two surfaces together. It relates to a cured aqueous adhesive.

[0002]

2. Description of the Related Art As the liquid A, an imide group (-
An aqueous adhesive prepared by blending an aqueous solution of a synthetic polymer compound having a CO) ₂ NH structure and a rubber latex, and a two-package separation-type fast-setting aqueous adhesive using a polyaldehyde aqueous solution such as a glyoxal aqueous solution as the B liquid are honeymoon type adhesives. Widely used in industry as a water-based adhesive. This honeymoon-type adhesive has an adhesive mechanism for temporarily bonding at an early stage by gelling at the moment when the liquid A and the liquid B come into contact with each other. This temporary bonding gives an adhesive strength that cannot be easily peeled off in a matter of seconds to minutes, and shifts to permanent bonding with the disappearance of water. However, the initial adhesive strength is greatly affected by the type of rubber latex, which is the main raw material of the liquid A. The rubber component of the rubber latex is roughly classified into a rubber having no functional group in the molecule (hereinafter referred to as a non-functional rubber) and a rubber having a carboxyl group in the molecule (hereinafter referred to as a carboxylated rubber).

[0003] When a nonfunctional rubber latex is mixed with an aqueous solution of the synthetic polymer compound to prepare a solution A,
The obtained solution A exhibits excellent mixing stability and long-term storage stability, but has low initial adhesive strength. On the other hand, the liquid A using the latex of the carboxylated rubber has an excellent initial adhesive strength, but coarse particles are apt to be generated when the two components are mixed, and thickening, separation, and gelation occur during long-term storage. It was a drawback. However, since this honeymoon type adhesive is characterized by the initial adhesive strength, a carboxylated rubber latex has to be used at the expense of mixing stability and long-term storage stability.

In an attempt to alleviate this problem, Japanese Patent Application Laid-Open No. 6-116543 discloses, as a carboxylated rubber latex in Solution A, 1) an aliphatic conjugated diene monomer (for example, butadiene) (25 To 50% by weight) / ethylenically unsaturated carboxylic acid monomer (for example, acrylic acid) (0.5 to 10% by weight) / other monomer copolymerizable therewith (for example, styrene) (40 to 50% by weight). 74.5
%) And 2) the total amount of detected acid measured by conductivity titration is 20 to 60 meq, and the distribution ratio of these detected acid amounts to a) the latex surface and b) the aqueous layer portion is a) / b) = 1 / 1.5 to 1/5 were used. However, even with this technique, the initial bond strength is not sufficient and the long-term storage stability is only two weeks (1
It is only kept for about 4 days), which is insufficient for practical use and has not solved the problem.

[0005]

An object of the present invention is to provide a honeymoon adhesive comprising an aqueous solution of a synthetic polymer compound having an imide group (—CO) ₂ NH structure in a molecule and a carboxylated rubber latex. It has the same or better initial adhesive strength than the conventional ones, and has excellent mixing stability of the latex and an aqueous solution of a synthetic high molecular compound, and exhibits surprising storage stability over a period of one year or more, and also has an open deposition time. (Op
It is an object of the present invention to provide a two-liquid separation coating type fast-curing adhesive composition having a longer en assembly time (JIS K 6800).
Here, open assembly time (JIS K 68
(00) means the time during which the adherend can be left in the air from the time the adhesive is applied to the adherend to the time when the adhesive is pressed, and the longer this time is, the better the work efficiency and workability are. Have been.

[0006]

The present inventor has set forth what type of carboxylated rubber latex is,
I have studied for many years to see if the above goals can be achieved. In other words, when comprehensively examining the type of emulsifier, the copolymerization ratio of rubber component monomers, copolymerization with other monomers, appropriate molecular weight, etc., when using rubber latex having hydroxyl groups in addition to carboxyl groups in the molecule As far as possible, the inventors have found that the above-mentioned target can be achieved, and have further completed the present invention by further studying the quantitative ratio of the hydroxyl group to the carboxyl group and the properties based thereon. That is, the present invention provides (1) an aqueous solution of a synthetic high molecular compound having an imide group (—CO) ₂ NH structure in a molecule as solution A, and 1 part by weight of a solid content of the aqueous solution, An aqueous adhesive obtained by mixing a rubber latex having both a hydroxyl group and a carboxyl group in a solid content within a range of up to 10 parts by weight as a solid content, and a two-part separation coating speed using a polyaldehyde aqueous solution as a B liquid. A cured adhesive composition, and (2) the aqueous solution of the synthetic polymer compound is an alkaline aqueous solution of an isobutylene-maleic anhydride-maleimide copolymer.
And (3) the rubber latex is a styrene-butadiene-based latex according to (1) or (2). (4) The rubber latex has a hydroxyl group content of 0.5 to 10.0 mol% (based on the rubber solid content of the rubber latex).
In the same manner, the content of the carboxyl group is 1.5 to 10.0
Mol% (based on the rubber solid content of the rubber latex), and the molar ratio of hydroxyl group / carboxyl group is 1/6.
The two-component, separate-coating, quick-setting adhesive composition according to any one of the above (1) to (3).

Hereinafter, the present invention will be described in detail. Examples of the synthetic polymer compound having an imide group (—CO) ₂ NH structure in the molecule used in the solution A of the present invention include α, β monounsaturated compounds having a maleimide group in the molecule and maleimide. Synthetic polymer compounds such as multi-component copolymers are suitable. In a multi-component copolymer having a maleimide group in the molecule, an unsaturated compound capable of forming a carboxyl group such as maleic anhydride as one component of the copolymer,
The copolymer is water-soluble and is useful and preferable for improving the adhesive performance. These polymer compounds can be used in the present invention by dissolving them in water as they are or by adding a basic substance and solubilizing them in water to form an aqueous solution.

[0008] These multi-component copolymers used in the solution A of the present invention include vinyl acetate-maleic anhydride-maleimide, styrene-maleic anhydride-maleimide, isobutylene-maleic anhydride-maleimide, styrene-isobutylene-maleic anhydride. Acid-maleimide,
Examples thereof include vinyl methyl ether-maleimide and vinyl pyrrolidone-maleimide, which may be used alone or in combination of two or more. The maleimide component of the multi-component copolymer may be used by reacting maleic anhydride of the copolymer with ammonia and converting a part of the maleic anhydride to maleimide.

As the aqueous solution of the synthetic polymer compound having an imide group in the molecule of the solution A of the present invention, an isobutylene-maleic anhydride copolymer is reacted with ammonia, and a part of the maleic anhydride in the molecule is converted into maleic anhydride. A partially imidized polymer of an isobutylene-maleic anhydride copolymer in which 10 to 90 mol% of maleic acid remains, obtained by imidization (hereinafter, referred to as a "partially imidized polymer of an isobutylene-maleic anhydride copolymer"). An aqueous alkali solution, particularly an aqueous ammonia solution, is preferred. The solution A of the present invention is used by mixing a carboxylated rubber latex with an aqueous solution of a synthetic polymer compound having an imide group in the molecule, and this mixture is used for the elasticity, water resistance, and adhesive performance of the cured adhesive film. It is essential to improve

The solution A of the present invention has excellent initial adhesive strength and miscibility, exhibits astounding storage stability over a period of one year or more, and has an open deposition time (open assembly time). In order to make the time (JIS K 6800) longer, a rubber latex having both a hydroxyl group and a carboxyl group in the molecule is used as the rubber latex. Examples of the rubber latex include aqueous latexes such as carboxyl-modified styrene-butadiene-based synthetic rubber, acrylonitrile-butadiene-based synthetic rubber, chloroprene-based synthetic rubber, and natural rubber. , SBR.) Latex is preferred.

In order for the solution A of the present invention to exhibit excellent initial adhesive strength, mixing stability and surprising long-term storage stability for one year or more, the rubber latex has a hydroxyl group content of 0%. 0.5 to 10.0 mol% (based on the rubber solid content of the rubber latex), preferably 1.0 to 4.0 mol%.
0 mol%, and the content of the carboxyl group is 1.5 to 1
0.0 mol% (based on the rubber solid content of the rubber latex), preferably 2.0 to 4.0 mol%, and a molar ratio of hydroxyl group / carboxyl group of 1/6 or more, preferably 1 / 4 or more.

When the content of the hydroxyl group is 0.5 mol% or less, the mixing stability and the long-term storage stability are reduced.
When the content is 0.0 mol% or more, the effects are saturated and the monomer is expensive, which is disadvantageous in cost, and both are not preferred. On the other hand, when the content of the carboxyl group is also 1.5 mol% or less, the initial adhesive strength decreases, and when it is 10.0 mol% or more, the initial adhesive strength is saturated and the viscosity suddenly increases. In addition, the cost is disadvantageous because the monomer is expensive, and both are not preferred. When the molar ratio of the hydroxyl group / carboxyl group is less than 1/6, the initial adhesive strength is large, but the miscibility and long-term storage stability for one year or more are undesirably poor.

In order to introduce a carboxyl group hydroxyl group into the rubber latex of the present invention, an ethylenically unsaturated carboxylic acid is used, and specifically, acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, etc. Mono- or dicarboxylic acids (anhydrides). In order to introduce a hydroxyl group, an unsaturated monomer containing a hydroxyalkyl group is used. Specifically, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, hydroxybutyl Examples thereof include methacrylate, di (ethylene glycol) maleate, and 2-hydroxyethyl methyl fumarate. Among them, hydroxyethyl acrylate (HEA) is preferable.

In preparing the rubber latex of the present invention, in addition to the ethylenically unsaturated carboxylic acid, the unsaturated monomer containing a hydroxyalkyl group, and the rubber component monomer, methyl as a monomer copolymerizable therewith is used. Unsaturated carboxylic acid alkyl esters such as methacrylate, vinyl cyanide monomers such as acrylonitrile, and unsaturated carboxylic acid amide monomers such as acrylamide may be used. The rubber latex having both a hydroxyl group and a carboxyl group in the molecule of the present invention has an upper limit of 10 superposed parts as a solid based on 1 part by weight of an aqueous solution of a synthetic polymer compound having an imide group in the molecule. It is better to mix as much as possible. If the mixing amount is too large, the gel formed by contact between the polymer compound having an imide group in the molecule in the liquid A and glyoxal or other polyaldehyde compound in the liquid B becomes insufficient in gel strength. Does not exhibit fast curing properties, cannot exhibit excellent initial adhesive strength in a very short time, and has insufficient final adhesive strength.

A filler can be added to the solution A as needed for the purpose of increasing the amount and strengthening. Examples of the filling ratio include calcium carbonate, kaolin, baryta, wood flour, plant flour and the like, and an appropriate amount is added according to the purpose.
In addition, in addition to the above, the liquid A in the present invention may be added with a plasticizer, a coloring agent, and other compounding agents, which are usually used as necessary. It can be added and used. On the other hand, examples of the water-soluble polyaldehyde compound used in the solution B of the present invention include glyoxal, malondialdehyde, succindialdehyde, glutardialdehyde, vimelindialdehyde, suberindialdehyde, and the like, and glyoxal is particularly preferred. It is. These polyaldehyde compounds are usually used as a 2 to 50% aqueous solution. Alternatively, an aqueous solution obtained by mixing two or more of these may be used.

The solution B is prepared as an aqueous solution or an aqueous dispersion obtained by adding and mixing a crosslinking agent which forms a crosslink with a functional group such as a carboxyl group of a polymer compound contained in the solution A. Can be used. Thus, when the two liquids are separately applied, bonded and adhered, it is possible to generate this cross-linking in parallel with the gelation by the polyaldehyde compound, and the cross-linking can be performed without reacting with the polyaldehyde compound. Agents are suitable. Examples of such a cross-linking agent include hydrophilic polyepoxy compounds, such as polyol polyepoxide.

It is preferable that these crosslinking agents are mixed within a range of not more than 10 parts by weight per 1 part by weight of the polyaldehyde compound. If the amount is too large, the strength of the gel formed by the components in the solution A and the polyaldehyde compound at the time of bonding becomes insufficient, the desired quick-curing property is not exhibited, and a sufficient initial adhesive strength cannot be obtained. When a crosslinking agent is mixed with the aldehyde compound, the compound is rapidly cured by gel formation, and the water resistance and heat resistance after curing are improved by crosslinking.

In the liquid B of the present invention, a coloring agent, a surfactant, a water-soluble polymer compound, a viscosity modifier and the like may be appropriately added as long as the curing of the polyaldehyde compound is not impaired. You may use it. The two-component, separate-coating, fast-curing adhesive composition comprising the A and B liquids obtained by the present invention is obtained by applying the A liquid to one adherent surface, for example, one surface of wood or the like, and bonding the B liquid to the other surface. Is applied to the surface to be adhered, and the two surfaces are stuck together, pressed and pressed,
Temporary gelation causes temporary temporary bonding at an early stage. This temporary bonding provides an adhesive strength that cannot be easily peeled in a very short time (for example, about 10 seconds), and shifts to permanent bonding with the disappearance of moisture.

In general, in the case of bonding using an aqueous medium, a sufficient final bonding strength is not obtained at room temperature unless the pressing and pressing are performed for a considerably long time. However, according to the adhesive composition of the present invention, the bonding speed is high. Due to the curability, the pressing press can be operated for a short time (for example,
(10 seconds), it is possible to perform adhesion with sufficient final adhesion strength after standing and curing. Therefore, the time for pressing and pressing can be significantly reduced (see "Minimum pressing time" in Table 1), and thus the workability can be significantly improved. In addition, the adhesive composition of the present invention may be applied and dried in advance with the solution B, and later, the solution A may be applied to another surface and adhered and adhered to perform a desired contact. It can be used with the same workability as a one-part adhesive. Therefore, when the adhesive composition of the present invention is used for woodworking and the like, a continuous conveyor system can be formed.

The adhesive composition of the present invention can be used for various woody materials, for example, materials such as wood, chipboard, and hardboard, inorganic materials such as slate board and silica board, melamine resin decorative materials, and plastics such as bakelite. Materials, paper materials such as corrugated paperboard and kraft paper can be bonded. Therefore, such as flash panels, decorative plywood, prefabricated panels, glued wood, etc.
Work such as tenon, dowel, torme, sword, square wood, and other assembling work is quick and labor-saving, and can be bonded even at room temperature, contributing to energy saving. Hereinafter, the adhesive composition of the present invention will be specifically described with reference to examples. However, the present invention is not limited by these examples.

[0021]

EXAMPLES All parts and percentages in the examples and comparative examples are parts by weight and percentages by weight. (Example 1) <Preparation of SBR latex> Each monomer shown in Table 1 and t
A mixture of dodecyl mercaptan, 0.6 parts of sodium dodecylbenzenesulfonate, 0.5 part of sodium hydrogen carbonate, 0.8 part of ammonium persulfate and 100 parts of water was added to 10 parts.
The mixture was charged in a 1 liter autoclave and polymerization was carried out with stirring. The polymerization temperature was 65 ° C. Next, unreacted monomers and the like are removed from the reaction product by steam distillation, and the SBR is removed.
Latex was obtained. Subsequently, 25% aqueous ammonia and caustic soda were added to the latex to adjust the pH to 7, and the solid content to 48%.

<Preparation of Solution A> In 210 parts of water, 80 parts of a partially imidized polymer of an isobutylene-maleic anhydride copolymer (manufactured by Kuraray Co., Ltd .: Isoban 306) and 25%
After adding 20 parts of aqueous ammonia and heating and dissolving while stirring, 190 parts of calcium carbonate and 5 parts of the above-mentioned SBR latex 5 were added.
Then, 00 parts was added to obtain solution A. <Preparation of solution B> A 20% aqueous glyoxal solution was used as solution B. (1) Evaluation of mixing stability (JIS K 6804 “7.
(1) Appearance test method)) Immediately after the preparation, the solution A was uniformly and thinly coated on a clean slide glass plate with a glass rod or the like, and immediately checked for the presence of coarse particles to evaluate the miscibility. ：: No coarse particles are observed. X: Even one coarse particle is observed.

(2) Evaluation of reproducibility of viscosity Several lots of the above SBR latex were prepared, and A
A liquid was prepared, and the viscosity of the obtained liquid A was measured. ：: When the difference in viscosity between lots is within 50% (Example: When the minimum is 10 Pa.s and the maximum is within 15 Pa.s) ×: When the difference in viscosity between lots is 50% or more (Example: Minimum) Is 10Pa.s and the maximum is 15Pa.s or more)

(3) Evaluation of long-term storage stability after storage for one year The prepared solution A was stored at room temperature for one year, stirred again, the state of mixing was observed, and the viscosity was measured to evaluate. For the observation of the mixing state, the liquid A after storage for one year was uniformly and thinly applied on a clean 10 cm × 12 cm slide glass plate with a glass rod, and immediately the presence or absence of coarse particles was examined. In addition, there is no problem in practical use in the case where the evaluation of long-term storage stability after storage for one year is △. ：: No coarse particles are present on the glass plate, and the increase in viscosity after storage is within 30% of that before storage (eg, before storage is within 10 Pa.s and after storage is within 13 Pa.s). When there are 1 to 5 coarse particles on the glass plate, and the increase in viscosity after storage is within 50% of that before storage (Example: 10 Pa.s before storage and 15 Pa.s after storage) X: When there are 6 or more coarse particles on the glass plate. Or, when the increase in viscosity after storage is 50% or more compared to that before storage (Example: 10 Pa.s before storage and 15 Pa.s or more after storage)

(4) Evaluation of "shortest press time" Liquid B is applied to two 4 cm x 5 cm 5 mm thick Rawan plywood and dried. The coating amount is 30 g / m ² . 4cm
Solution A is applied to the upper and lower surfaces of a 1 cm thick rice pine having a size of × 4 cm. The coating amount is 250 g / m ² . Yonematsu is sandwiched between two plywoods so that the liquids A and B are in contact with each other and the three sides thereof are coincident, and after pressing for a certain period of time, immediately project the protruding ends of the two plywoods. Spread outward and peel off,
At that time, the adhesive strength (Kgf / cm ² ) was measured. Then, the relationship between the adhesive strength and the pressing time at this time was examined, and the time at which the adhesive strength was 12 kgf / cm ² was defined as “the shortest press time”. Experience has shown that 12 kgf
When the above-mentioned adhesive strength is obtained, good adhesion can be obtained even in actual bonding work of plywood. But 12kg
In the case of f or less, poor adhesion frequently occurs in actual work. Therefore, as the time at which the adhesive strength becomes 12 kgf / cm ² , that is, the “shortest press time”, is shorter, the pressing time is shorter, and the workability is improved. For example, when the "minimum press time" is 10 seconds, the time is 1/3 of that of 30 seconds.
, The work efficiency is tripled.

(5) Evaluation of Initial Adhesive Strength (30 Seconds) Liquid B is applied to two pieces of 5 mm thick Rawan plywood having a size of 4 cm × 5 cm and dried. The coating amount is 30 g / m ² . 4cm
Solution A is applied to the upper and lower surfaces of a 1 cm thick rice pine having a size of × 4 cm. The coating amount is 250 g / m ² . Yonematsu is sandwiched between two plywoods so that the liquids A and B are in contact with each other and the three sides thereof are coincident with each other.
The protruding ends of the plywood were expanded outward and peeled off, and the adhesive strength (Kgf / cm ² ) at that time was measured. It is determined that the larger the measured value, the better. The results of the above (1) to (5) are shown in the lower column of Table 1 (Example 1). (Comparative Examples 1 to 5) Table 1 (Comparative Examples 1 to 5) was carried out in exactly the same manner as in Example 1 except that the SBR latex synthesizing composition shown in the upper column was used. The results shown in the lower column of Examples 1 to 5) were obtained. (Comparative Example 6) The same procedure as in Example 1 was carried out except that the latex obtained by mixing 50% each of the SBR latexes of Comparative Example 2 and Comparative Example 4 was used, and the lower column of Table 1 (Comparative Example 6) was used. Were obtained.

[0027]

[Table 1]

As is clear from the results in Table 1, Comparative Example 1
When the SBR latex having only 2 carboxyl groups is used, the shortest press time and the initial adhesive strength are good, but the mixing stability, viscosity reproducibility and long-term storage stability after one year storage are poor. . When the SBR latex having only a hydroxyl group of Comparative Examples 3 and 4 was used, the mixing stability, viscosity reproducibility and long-term storage stability after one year storage were good, but the shortest press time and initial adhesive strength were poor. It is. SBR of Comparative Example 5 having neither a hydroxyl group nor a carboxyl group
When latex is used, it is the same as in Comparative Examples 3 and 4. When the mixed latex of Comparative Example 6 was used, the shortest press time and the initial adhesive strength were almost good as a result of being affected by the carboxyl group, but the mixing stability, viscosity reproducibility and long-term storage stability after one year storage were obtained. Sex is poor. As described above, only Example 1 satisfies the minimum press time, the initial adhesive strength and the mixing stability, the viscosity reproducibility, and the long-term storage property after one year storage.

(Example 2) Next, in <Preparation of SBR latex> of Example 1, mol% of acrylic acid and hydroxyethyl acrylate (HEA) based on SBR solid content, that is, hydroxyl group (OH group) and carboxyl group ( CO
A latex was synthesized by varying the molar% of the (OH group) variously as shown in Table 2. Using this, a two-component fraction coating fast curing aqueous adhesive was obtained in exactly the same manner as in Example 1. In Table 2, the numbers on the horizontal axis indicate acrylic acid, and the numbers on the vertical axis indicate mole% (relative to SBR solids) of hydroxyethyl acrylate (HEA). (3) Long-term storage stability (○, Δ, ×) after one-year storage of the two-component, separate-coating, fast-curing aqueous adhesive prepared by using a latex, and the lower row shows the (4) initial stability. The evaluation results of the adhesive strength (Kgf / cm ² ) are shown.

From the results shown in Table 2, the solution A of the present invention simultaneously exhibits excellent initial adhesive strength (15 kgf / cm ² or more) and long-term storage stability after one year storage (evaluation: ○ to Δ). (The area within the frame of the bold line) shows that the content of hydroxyl groups in the SBR latex is 0.5 to 10.0 mol% (based on the rubber solid content of the rubber latex), and the content of carboxyl groups is also the same. Is from 1.5 to 10.0 mol% (based on the rubber solid content of the rubber latex), and
It can be seen that the molar ratio of carboxyl groups must be 1/6 or more (evaluation of long-term storage stability after one year storage: ○ to Δ), preferably １ ／ or more (same as ○). Then, as the number of moles of hydroxyl groups and carboxyl groups increases, the viscosity and cost of the SBR latex also increase. Therefore, considering the work of preparing the solution A, the coating work, and the economics, the content of the hydroxyl groups and carboxyl groups is considered. Are preferably 1.0 to 4.0 mol% and 2.0 to 4.0 mol%, respectively.
It is. The shaded portions in Table 2 indicate regions where the SBR latex cannot be used due to its high viscosity.

[0031]

[Table 2]

(Example 3) A tape was formed on four sides of the surface of a square glass plate to form a frame, and the solution A of Example 1 was uniformly applied inside the frame. 260g /
m. Then, a tape frame was similarly formed on another square glass plate, and the same amount of the solution A prepared in the same manner as in Example 1 except that hydroxyethyl acrylate (HEA) was not used was applied to the inside of the frame. 23 samples of both
It was left at 0 ° C. and touched the applied surface with a finger at each elapsed time to observe whether the adhesive was attached (transferred) to the finger. ：: Transfer sufficiently. Δ: Transfer when strongly touched. ×: No transfer. The results are shown in Table 3 below. In Table 3, the former is displayed as "COOH + OH" and the latter is displayed as "COOH only". From the results in Table 3, "COOH + OH"
The liquid A (the liquid A in Example 1) has a longer time for the liquid A to stick (transfer) to the finger than the liquid having “COOH only”, that is, the time that the liquid A can be left in the air without drying ( (Open deposition time) is long. Since the open deposition time is long, a large amount of the adherend can be applied and applied, and even if it is pressed afterwards, an appropriate adhesive force is exhibited, so that work efficiency and workability are improved.

[0033]

[Table 3]

[0034]

As described above, the present invention relates to a honeymoon adhesive comprising an aqueous solution of a synthetic polymer compound having an imide group (—CO) ₂ NH structure in a molecule and a carboxylated rubber latex. By using a rubber latex having both a hydroxyl group and a carboxyl group in the molecule as the rubber latex, the content of the hydroxyl group is particularly 0.5 to 10.0 mol% (provided that the rubber solid content of the rubber latex is ), The carboxyl group content is 1.5 to 10.0 mol% (based on the rubber solid content of the rubber latex), and the molar ratio of hydroxyl group / carboxyl group is 1/6. As described above, the use of a rubber latex of preferably 1/4 or more provides an initial bond strength equal to or higher than that of the conventional two-package separate-coating type fast-setting aqueous adhesive and excellent mixing stability. In addition, the storage stability can be improved over a period of one year or more, and the open assembly time (JIS K 6800) can be further increased.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J040 CA011 CA012 CA071 CA072 CA081 CA082 CA151 CA152 DA141 DA142 DB041 DB042 DD051 DD052 DE021 DE022 DG021 DG022 DH031 DH032 GA05 GA07 GA12 GA22 HB17 JA03 JA13 KA16 LA05

Claims (4)

[Claims] 1. An imide group (—CO) in a molecule as a liquid A.
_The upper limit is 10 parts by weight of a rubber latex having both a hydroxyl group and a carboxyl group in a molecule as a solid content with respect to an aqueous solution of a synthetic polymer compound having a ₂ NH ₂ structure and 1 part by weight of the solid content of the aqueous solution. An aqueous adhesive obtained by mixing in the range described above, and a two-liquid separation coating fast-curing adhesive composition characterized by using a polyaldehyde aqueous solution as the B liquid. 2. The two-component, fractionally applied, fast-curing adhesive composition according to claim 1, wherein the aqueous solution of the synthetic polymer compound is an alkaline aqueous solution of an isobutylene-maleic anhydride-maleimide copolymer. object. 3. The two-component, separate-coating, quick-setting adhesive composition according to claim 1, wherein the rubber latex is a styrene-butadiene-based latex. 4. The rubber latex has a hydroxyl group content of 0.5 to 10.0 mol% (based on the rubber solid content of the rubber latex), and a carboxyl group content of 1.5 to 10.0 mol%. 4. The composition according to claim 1, wherein the molar ratio of the hydroxyl group to the carboxyl group is 10.0 mol% (based on the rubber solid content of the rubber latex) and 1/6 or more. Item 2. The two-component, separate-coating, fast-curing adhesive composition according to item 1.