JPS6213456A - Room temperature curing aqueous composition and method for using same - Google Patents

Abstract

PURPOSE:To form a room temperature curing aq. compsn. for which it is not necessary to retain a polymer and a crosslinking agent separately, by dispersing a crosslinking agent captured by a first polymer and a polymer crosslinked by said crosslinking agent in the form of fine particles in water. CONSTITUTION:The following components A and B in the form of fine particles are dispersed in water. Component A is a first polymer which captured a polyfunctional compd. Component B is a second polymer contg. a functional group capable of reacting with a functional group of the polyfunctional compd. The room temperature curing aq. compsn. is applied to the surface of a material to be treated, and water is evaporated to thereby bring the first polymer into contact with the second polymer, thus forming a high-molecular film. Examples of the polyfunctional compds. acting as said crosslinking agent are those contg. at least two functional groups selected from among epoxy, amino, carboxyl, hydroxyl, amide, N-methylolamide groups, etc.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a method of dispersing a crosslinking agent captured by a first polymer and a second polymer crosslinked with this crosslinking agent in the form of fine particles in water. The present invention relates to a room temperature curable aqueous composition and a method for using the same.

[Conventional technology]

Conventionally, for aqueous emulsion type compositions used as adhesives and paints, in order to increase film strength, the main chain of the polymer is crosslinked and cured by reacting with a crosslinking agent during the film formation process. ing. There are two types of such aqueous emulsion type compositions: those using crosslinking agents that react at room temperature and those using crosslinking agents that react at high temperatures.

[Problem that the invention seeks to solve]

For an aqueous emulsion type composition using a crosslinking agent that reacts at room temperature, if the polymer and crosslinking agent are mixed in advance, the crosslinking reaction will proceed during storage etc. and the aqueous emulsion type composition will thicken and harden, making it impossible to coat. . Therefore, the polymer and crosslinking agent are kept separated in separate containers until used, and are mixed together each time they are used. However, it is cumbersome to mix the two liquids each time they are used. Moreover, if the compound is not used up within a certain period of time, the remaining compound will thicken and harden over time, which is inconvenient and uneconomical.

In addition, in aqueous emulsion type compositions that use a latent crosslinking agent that reacts only at high temperatures, the crosslinking reaction does not occur at room temperature;
Since the polymer and the crosslinking agent can be blended in advance, the above-mentioned disadvantages do not occur, but since a heating device is required to cause the crosslinking reaction, there is a drawback that the cost of the heating device etc. is high.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide an aqueous room-temperature curable composition that uses a crosslinking agent that reacts at room temperature and that does not require separate holding of the polymer and the crosslinking agent, and a method for using the same. purpose.

[Means for solving problems]

In order to achieve the above object, the first gist of the present invention is a room temperature curable aqueous composition in which the following components (A) and (B) are dispersed in water in the form of fine particles, (A) A first polymer that has captured a polyfunctional compound.

(B) A second polymer having a functional group that reacts with a functional group of a polyfunctional compound in its molecular structure.

A polymer that captures a polyfunctional compound (first polymer) and a second polymer that has a functional group that reacts with the functional group of the polyfunctional compound in its molecular structure are each dispersed in water in the form of fine particles at room temperature. A curable aqueous composition is prepared, and the room-temperature curable aqueous composition is applied to the surface to be treated and water is evaporated to react with the polyfunctional compound-trapping polymer and the functional groups of the polyfunctional compound in the molecular structure. The second gist is a method for using an aqueous room-temperature curable composition that forms a polymer film by contacting it with a polymer having a functional group.

The present inventors have discovered that in an aqueous emulsion type composition using a room temperature reactive crosslinking agent, the polymer and the crosslinking agent are separated,
We believe that if the composition is brought into contact with the two after being applied, the crosslinking reaction will not occur during storage, even if the polymer and crosslinking agent are mixed in advance.In order to realize this, we conducted a series of studies using various materials. layered. As a result, by using a polyfunctional compound as a crosslinking agent, capturing it in the first polymer, and dispersing it in the form of fine particles in water, an emulsion is created in which the polyfunctional compound crosslinking agent is blocked from water, and By making an emulsion of a polymer (second polymer) having a group that reacts with the functional group of the multifunctional compound crosslinking agent and mixing the two to form an aqueous emulsion type composition, the desired purpose can be achieved and scales can be identified. Ta.

That is, in this composition, the polyfunctional compound crosslinking agent is in a trapped state, and the solubility of the polyfunctional compound in water is low, and the surfactant used has a low emulsifying ability for the polyfunctional compound. Since the diffusion of the polyfunctional compound through the phase is extremely restricted, crosslinking reactions do not occur during storage, etc., and after application of the emulsion type composition, the polyfunctional compound crosslinking agent bleeds out only when water evaporates, resulting in the above-mentioned The second polymer is crosslinked and a tough coating film is formed.

Next, this invention will be explained in detail.

A schematic diagram of the room temperature curable aqueous composition of the present invention is shown in FIG. The room temperature curable aqueous composition of the present invention comprises: 1. water, 2. polyfunctional compound as a crosslinking agent. The first polymer 31 that captures this is composed of a second polymer 4 having a functional group that reacts with the functional group of the polyfunctional compound in its molecular structure, and the first polymer 3 and the second polymer 4 are Each is emulsified and dispersed in 1 part of water with 5.6 parts of surfactant.

As is clear from FIG. 1, the polyfunctional compound 2 is captured by the first polymer 3, and this capture polymer 3 is
Surfactant 5 is oriented in a micelle shape around its outer periphery and dispersed in water 1 in the form of fine particles. In this way, the multifunctional compound 2, which is a crosslinking agent, is trapped in the first polymer 3.

On the other hand, the second polymer 4, which has a functional group that reacts with the functional group of the polyfunctional compound in its molecular structure, is dispersed in water in the form of particles by the surfactant 5, and is also in a stable state.

Examples of the polyfunctional compound 2 that acts as a crosslinking agent include an epoxy group, an amino group, and a carboxyl group.

Examples include those having two or more functional groups such as a hydroxyl group, an amide group, and an N-methylolamide group in the molecule.

Examples of the polyfunctional epoxy compound include diglycidyl ether of bisphenol A and diglycidyl ether of brominated bisphenol A.

Examples include polycarboxylic acid polyglycidyl ether, alkane polyol polyglycidyl ether, and epoxy novolac.

Examples of polyfunctional amine compounds include aromatic polyamines such as metaphenylenediamine, linear aliphatic polyamines such as diethylenetriamine, triethylenetriamine, and hexamethylenediamine, cycloaliphatic polyamines commercially available as curing agents for epoxy resins, and aliphatic polyamines. Examples include polyamine adducts, ketoimines, modified aliphatic polyamines, and polyamide amines.

Examples of polyfunctional carboxyl compounds include aliphatic polycarboxylic acids with relatively large aliphatic chains such as hexamethylene dicarboxylic acid, aliphatic polycarboxylic anhydrides, terephthalic acid, isophthalic acid, pyromellitic acid,
Examples include pyromellitic dianhydride, benzophenonetetracarboxylic acid, and benzophenonetetracarboxylic dianhydride.

The polyfunctional compound 2 may be liquid or solid at room temperature or at the reaction temperature during the preparation of the first polymer 3, as long as it is ultimately captured by the first polymer 3. I don't mind. However, if a liquid material is used at room temperature, the molecules tend to move easily, so the first and second polymers 3
, 4 is in contact with each other, the bleeding speed is fast, and the coating film strength develops quickly.

The first polymer 3 that captures the polyfunctional compound 2 is styrene, a styrene derivative, or butadiene.

These include monomers or copolymers of monomers having ethylenically unsaturated bonds, such as acrylonitrile, chloroprene, acrylic esters, methacrylic esters, vinyl acetate, ethylene, hinyl chloride, and vinylidene chloride.

In addition, the second polymer 4, which has a functional group that reacts with the functional group of the polyfunctional compound in its molecular structure, reacts with the functional group of the polyfunctional compound so that, for example, the functional groups are distributed at appropriate intervals in the molecular chain. A monomer that has a functional group that reacts with the functional group of a polyfunctional compound and an ethylenically unsaturated bond is copolymerized with a monomer that does not have a functional group that reacts with the functional group of a polyfunctional compound and has an ethylenically unsaturated bond. It can be obtained by

Monomers having a functional group that reacts with the functional group of the polyfunctional compound and having an ethylenically unsaturated bond include a hydroxyl group, a carboxyl group, an amino group, an epoxy group,
N-methylolamide group.

Examples include monomers having sulfonic acid groups, etc. in the molecule. Here, the monomer having a hydroxyl group is, for example, allyl alcohol, 2-hydroxyethyl methacrylate,
2-hydroxyethyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, monoallyl ether of polyhydric alcohol, etc. Monomers having a carboxyl group include, for example, acrylic acid, methacrylic acid, itaconic acid, fumaric acid.

These include unsaturated polymerizable organic acids such as crotonic acid, maleic acid monoester, itaconic acid monoester, fumaric acid monoester, and maleic acid. Furthermore, the monomer having an amino group is, for example, allylamine.

ter t-butylaminoethyl methacrylate, etc., and monomers with epoxy groups are, for example, glycidyl acrylate, glycidyl methacrylate, etc., and N-
Monomers having a methylolamide group include N-methylol acrylamide, N-methylol methacrylamide, etc., and monomers having a sulfonic acid group include vinylsulfonic acid,
Styrene sulfonic acid, etc. Further, a monomer having an ethylenically unsaturated bond but not having a functional group that reacts with the functional group of a polyfunctional compound is, for example, styrene.

Styrene derivatives, butadiene, acrylonitrile, methacrylonitrile, acrylic esters.

Methacrylic acid ester, vinyl acetate, ethylene.

These include vinyl chloride and vinylidene chloride.

The second polymer 4 obtained by copolymerizing these monomers has a functional group in the molecule that reacts with the functional group of the polyfunctional compound, so when it comes into contact with the polyfunctional compound 2, it crosslinks and hardens. It has the following characteristics.

As the surfactant 5.6 used in the present invention, any of anionic surfactants, cationic surfactants, and nonionic surfactants may be used, such as polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl Examples include ether and polyoxyethylene sorbitan monostearate. Additionally, water-soluble polymers such as starch, dextrin, methyl cellulose, carboxymethyl cellulose, polyacrylic acid or its water-soluble salt, polyacrylamide or its water-soluble copolymer, polyvinyl alcohol, water-soluble polyamide, etc. may be used. . The above surfactants can be used alone or in combination of two or more.

The surfactant 5 for emulsifying and dispersing the first polymer and the surfactant 6 for emulsifying and dispersing the second polymer may be of the same kind or different.

The room temperature curable aqueous composition of the present invention is produced using the above-mentioned raw materials, and the production is carried out, for example, as follows.

First, an emulsion of a polyfunctional compound-trapping polymer is created.

A method for producing this is, for example, a method in which a monomer, which is a raw material for the first polymer, is subjected to emulsion polymerization in water in the coexistence of a polyfunctional compound to trap the polyfunctional compound in the first polymer particles (hereinafter referred to as "coexistence method"). ), and a method in which a polyfunctional compound is added to an aqueous emulsion of a first polymer prepared by a known method while stirring, and the polyfunctional compound is absorbed into the first polymer particles (hereinafter referred to as "post-absorption method"). ) can be mentioned.

In both the coexistence method and post-absorption method, if the polyfunctional compound diffuses into the aqueous phase, a crosslinking reaction will occur when it coexists with the second polymer. Often the polyfunctional compound must be entrapped in the first polymer. For this purpose, it is necessary to satisfy the following conditions.

(1) The solubility of the polyfunctional compound in water is low.

(2) The surfactant used has a low emulsifying ability for polyfunctional compounds.

(3) The first polymer has an affinity with the polyfunctional compound to the extent that it can capture the polyfunctional compound.

Furthermore, in addition to the above conditions, when polymerizing the first polymer, 1
It is desirable that very little surfactant be present separately from the polymer particles after polymerization.

In the case of using the above coexistence method, the solubility of the polyfunctional compound in water, the emulsifying ability of the surfactant used for the polyfunctional compound itself, the weight ratio of the polyfunctional compound to the first polymer to be produced, the amount of the polyfunctional compound and the produced The distribution ratio of (aqueous phase)/(first polymer phase) of the polyfunctional compound can be controlled by appropriately selecting the Tg (glass transition temperature) etc. of the affinity bipolymer of the first polymer to be used. substantially, 100% by weight (hereinafter abbreviated as "%") of the polyfunctional compound is the first
It is possible to prepare emulsions in which the concentration in water is 0% by partitioning into the polymer phase. In this method, if the polyfunctional compound is one that easily reacts under acid or alkali conditions, such as an epoxy compound, it is desirable to maintain the pH of the system near neutrality during polymerization.

On the other hand, the post-absorption method is a method in which the polyfunctional compound is diffused into water and absorbed into the particles of the first polymer already present in the emulsion. Since the particles absorb the polyfunctional compound, a trace amount of the polyfunctional compound is more likely to remain in the water than in the coexistence method described above. However, while the coexistence method described above may result in insufficient polymerization stability of the first polymer, the post-absorption method does not suffer from such problems and has the advantage of being easy to operate. In addition, when absorbing a polyfunctional compound in the post-absorption method, it is preferable to heat the emulsion to 7 g or more of the first polymer because the absorption rate becomes faster.

Thus, emulsions of multifunctional compound-trapping polymers are characterized by the ease of absorption of the multifunctional compound into the first polymer (
It can be obtained by appropriately selecting one of the methods in consideration of the viscosity, whether the polymer is liquid or solid, etc., the polymerization stability of the first polymer, the required pot life, etc.

However, solvents with high solubility for polyfunctional compounds, such as toluene, acetone, and ethanol.

This does not mean that methanol etc. cannot be mixed with water and used.
It can be used as long as the concentration of the polyfunctional compound in water is low after the polyfunctional compound-trapping emulsion is formed.

Note that the proportion of the polyfunctional compound can be selected within the range of 2 to 1000% with respect to the first polymer. However, if the polyfunctional compound is too small, the crosslinking effect will not be obtained much after film formation.

In addition, in order to trap a large amount of a polyfunctional compound in the first polymer, it is necessary to polymerize only with a heptamer with low polarity such as styrene, ethylene, isoprene, or butadiene.
rather than obtaining a polymer with polarity such as acrylic ester, methacrylic ester, vinyl acetate, etc.
It is preferable to copolymerize more polar monomers such as vinyl chloride and vinylidene chloride. The content of these monomers is preferably about 10 to 100% in the case of slightly polar monomers, and about 1 to 50% in the case of more polar monomers, based on the total monomers.

In addition, during the production of the polyfunctional compound-trapping polymer, it is also possible to copolymerize a monomer having a functional group that reacts with the functional group of the polyfunctional compound, such as a hydroxyl group, a carboxyl group, or an amino group. . In this case, the capture polymer is crosslinked with a portion of the polyfunctional compound, so that the mobility of the polymer segment can be adjusted by changing the degree of crosslinking.
As a result, the rate of desorption of the polyfunctional compound can be controlled. However, if the copolymerization amount of the monomer having a functional group that reacts with the functional group of the polyfunctional compound is too large, the polyfunctional compound will cause crosslinking of the polyfunctional compound-trapping polymer itself.
The motion of the polymer segments becomes excessively restrained, which makes it difficult for the trapped multifunctional compound to detach from the trapped polymer even if it attempts to act as a crosslinker for the final polymer. This will prevent it from working smoothly. Therefore, it is desirable that the amount of copolymerized monomers having functional groups that react with the functional groups of the polyfunctional compound be kept at 10% or less of the total monomers.

Monomers with two or more double bonds, such as divinylbenzene, can also be used to control the elimination of polyfunctional compounds, but for the same reason as above, only one of the total monomers
It should be kept below 0%.

In addition, during the above-mentioned copolymerization, a known polymer modifier or the like may be allowed to coexist, if necessary.

In the thus obtained aqueous emulsion of the polyfunctional compound-trapping polymer, the polyfunctional compound serving as the crosslinking agent is trapped in the first polymer, which is dispersed in the water in the form of particles, and is not present in the water. Therefore, the crosslinking reaction will not proceed even if it is mixed in the same liquid with the second polymer that undergoes the crosslinking reaction.

After producing the multifunctional compound-trapping polymer emulsion as described above, an aqueous emulsion of a second polymer is then produced using known emulsion polymerization techniques. That is, in water in the presence of a surfactant that has a dispersion stabilizing effect, a monomer that has a functional group that reacts with the functional group of a polyfunctional compound and has an ethylenically unsaturated bond, and the functional group of the polyfunctional compound. By copolymerizing a monomer that does not have a functional group that reacts with the polyfunctional compound and has an ethylenically unsaturated bond, a second polymer that has a functional group that reacts with the functional group of the polyfunctional compound is produced. As a result, an aqueous emulsion of the second polymer is obtained. Note that the amount of copolymerized monomers having functional groups is desirably set to about 0.1 to 30% of the total monomers.

In the aqueous emulsion of the second polymer obtained in this way, the second polymer having a functional group that reacts with the functional group of the polyfunctional compound is dispersed in water in the form of particles by a surfactant serving as a dispersion stabilizer. It is in the same condition as it is.

Next, the aqueous emulsions of the first and second polymers are mixed such that the molar ratio of the functional group of the polyfunctional compound to the functional group that reacts with this functional group is 0.8 to 1.2. As a result, the room temperature curable aqueous composition of the present invention is obtained.

In the room-temperature-curing aqueous composition thus obtained, the crosslinking agent is trapped in the first polymer even though the polyfunctional compound as the crosslinking agent and the crosslinked polymer are mixed in the same solvent. The crosslinking reaction is prevented from proceeding because it does not diffuse into the water. This is the greatest feature of this invention. This aqueous composition lasts for 6 months or more at room temperature.
It is extremely stable without thickening or gelling. and,
When the composition is applied to the surface to be treated and water is volatilized, the polyfunctional compound-trapping polymer (first polymer) and the crosslinked polymer (second polymer) come into contact. Then,
The polyfunctional compound bleeds and reacts with the functional groups in the second polymer to form a cured film. The above crosslinking reaction progresses over time, and depends on the types of functional groups of the polyfunctional compound and the functional groups of the second polymer, the affinity of the polyfunctional compound and the first polymer, and the affinity of the first polymer of the polyfunctional compound. It can be controlled by changing the distribution within the polymer particles.

Note that the capture polymer that captures the polyfunctional compound is not supposed to essentially contribute to crosslinking, but in reality, the molecular chains of the resulting polymer and its own molecular chains are entangled, creating a network-like structure. Perhaps because of this, even if a coated film that has been formed and left for about a month is immersed in an organic solvent, almost no elution occurs.

As described above, in the room temperature curable aqueous composition of the present invention, the crosslinking reaction does not occur even though the crosslinking agent and the crosslinked polymer are mixed in the same solvent, and therefore the viscosity increases. It is a two-component type product that is kept uncured and only when it is applied at the time of use, a crosslinking reaction proceeds to form a film and harden, making it extremely easy to use.

〔Effect of the invention〕

As described above, the room temperature curable aqueous composition of the present invention maintains its initial state as long as the water does not volatilize, that is, in the state of an emulsion, and the crosslinking reaction does not proceed between the crosslinking agent and the crosslinked polymer. It is not necessary to separately hold the crosslinking agent and the crosslinked polymer in separate containers as in the room temperature curable aqueous composition. Furthermore, since it is not a two-component type, there is no need to mix the two together each time it is used, and it is sufficient to apply only the required amount to the surface to be coated. Therefore, it is extremely easy to use. That is, when the composition of the present invention forms a film and the water evaporates, it becomes insoluble in the solvent after one day, and the crosslinking density increases over time. Moreover, since no high-temperature-reactive crosslinking agent is used, no heating is required during curing, resulting in good workability.

The room temperature curable aqueous composition of the present invention can be used in a wide range of applications such as adhesives and paints. For example, as an adhesive, it is initially sticky and has excellent initial adhesive strength to bond adherends, and as time passes, the crosslinking density improves and the adhesive strength in the equilibrium state increases, making it an excellent adhesive. is obtained. In addition, in paints, the initial crosslinking density is low, so film forming properties are good, and over time the paint film crosslinks, increasing the hardness of the paint film and improving stain resistance. You can get something.

Next, examples will be described.

[Example 1] First, an aqueous emulsion of a polyfunctional compound-trapping polymer was obtained by a coexistence method. 91.6 g of water in four 300 mf capacity flasks equipped with thermometer, stirrer, condenser and addition funnel.

Emulgen 935, a surfactant (manufactured by Kao Soap Co., Ltd.)
2g, Emulgen 920 (manufactured by Kao Soap Co., Ltd.) 2g, sodium bisulfite 0.1g, trisodium phosphate 0.
2g was added and dissolved. Next, after purging the inside of the flask with nitrogen gas and keeping the system at 70°C, 44 g of methyl methacrylate, 3 g of acrylonitrile, 28 g of 2-ethylhexyl acrylate, and epoxy resin (Epicoat 9
828. A mixture of 25 g of monomer (manufactured by Yuka Shell Co., Ltd.) and 10 g of water in which 0.3 g of ammonium persulfate (polymerization initiator) was dissolved were added dropwise over 3 hours using separate dropping funnels, and then for 2 hours. A complete reaction was carried out. As a result, the acrylic polymer (first polymer)
Polymerization rate of 10 in which the epoxy compound is trapped in the particles
A stable aqueous emulsion with a solids content of about 50% was obtained.

Next, an aqueous emulsion of a second polymer having a functional group that reacts with the functional group of the polyfunctional compound was obtained. That is,
In a four-bottle flask with a capacity of 30 QmA equipped with a thermometer, stirrer, condenser, and dropping funnel, 91.6 g of water, 2 g of Emulgen 935 (manufactured by Kako Soup Co., Ltd.) as a surfactant, and 2 g of Emulgen 920 (manufactured by Kako Soap Co., Ltd.). 2 g and 0.1 g of sodium bisulfite were added and dissolved. Next, the inside of the flask was replaced with nitrogen gas, the system was maintained at 70°C, and while stirring, a mixed solution of 52 g of methyl methacrylate, 44 g of 2-ethylhexyl acrylate, and 8 g of tert-butylaminoethyl methacrylate was added. , 10 g of water in which 0.3 g of ammonium persulfate was dissolved was added dropwise over 3 hours using a separate dropping funnel, and then maintained for 2 hours to complete the reaction.

Then, an aqueous emulsion of a second polymer having an amino group that reacts with an epoxy group, which is a functional group of a polyfunctional compound, was obtained.

The thus obtained aqueous emulsion of the first polymer (hereinafter abbreviated as rEMIJ) and the aqueous emulsion of the second polymer (hereinafter abbreviated as rEM2) were mixed at 32
．． They were mixed at a ratio of 9/100 to obtain a room temperature curable aqueous composition of the present invention.

[Example 2] EMI and 2M2 were obtained in the same manner as in Example 1, but 2M
In the preparation of 2, the monomer to be copolymerized was
8 g instead of t-butylaminoethyl methacrylate
By using 6.25g of 0% acrylic acid aqueous solution,
A stable emulsion with a polymerization rate of 100% was obtained having carboxyl groups in the polymer. And EMI and 2M2,
They were mixed at a ratio of 52.7/100 to obtain a room temperature curable aqueous composition of the present invention.

[Example 3] EMI and 2M2 were obtained in the same manner as in Example 1, but EMI
In the preparation of epoxy resin Epicoat #82
In place of 8, 12.5 g of Epicure U (manufactured by Yuka Shell Co., Ltd.), which is a curing agent for aliphatic amine-based epoxy resins, was used to capture the amine compound in the polymer, resulting in a polymerization rate of 100.
%, and an emulsion with a solid content of 47% was obtained. Also, 2M2
In the preparation of 8 g of glycidyl methacrylate instead of 8 g of tert-butylaminoethyl methacrylate.
g, the polymer has an epoxy group, the polymerization rate is 1.
A stable emulsion of 0.00% was obtained. Then, EMI and 2M2 were mixed at a ratio of 22.3/100 to obtain a room temperature curable aqueous composition of the present invention.

[Example 4.5] EMI was obtained by the post-absorption method. That is, in the same reaction apparatus as in Example 1, 91.6 g of water, 2 g of Emulgen 935 (manufactured by Kako Soap Co., Ltd.) as a surfactant, 2 g of Emulgen 920 (manufactured by Kako Soap Co., Ltd.) and 0.0 g of sodium bisulfite were added.
Dissolve 1 g. After purging the inside of the flask with nitrogen gas and keeping the system at 70°C, while stirring, a monomer mixture solution of 44 g of methyl methacrylate, 3 g of acrylonitrile, and 28 g of 2-ethylhexyl acrylate was dissolved.
．． IO in which 3 g of potassium persulfate (polymerization initiator) was dissolved
g of water was added dropwise using a separate addition funnel over a period of 3 hours. Thereafter, the mixture was kept for 2 hours to complete the reaction, and a stable emulsion with a polymerization rate of 100% and a solid content of 43% was obtained.

For 100 g of this emulsion, 14 g of trimethylolpropane polyglycidyl ether (Epicote G
E-100,t[l (manufactured by KaShell Co., Ltd.) was added and kept at 40°C for 6 hours with stirring to obtain an emulsion with a solid content of about 50% in which the epoxy compound was captured in the acrylic polymer particles. This emulsion EMI and 2M2 used in Example 1 or 2M2 used in Example 2 are shown in Table 1.
A cold-curing aqueous composition of the present invention was obtained by mixing in the proportions shown.

The compositions of the room temperature curable aqueous compositions of Examples 1 to 5 above are summarized in Table 1.

(Margin below) [Test] One day after mixing, the five types of room-temperature-curing aqueous compositions were poured onto a polyethylene plate to a film thickness of 0.5 m, and a film was formed in a constant temperature bath at 20°C. One day, one month, and six months after film formation, about 0.1 g of the coating film was taken, immersed in 40 g of toluene, and the swelling rate and elution rate of the coating film-forming components after 24 hours were measured. Similar measurements were also carried out on the membranes formed after one month of mixing and wilting. The results are shown in Table 2.

(Margin below) Table 2 The unit of water elution amount is %.

From the results in Table 2, all of the room temperature curable aqueous compositions showed solvent resistance to the extent that the coating film did not dissolve one day after film formation, and the swelling rate and elution rate decreased over time. It can be seen that the crosslink density increases over time. Moreover, when comparing the swelling rate and elution rate of the membranes formed one day after mixing and one month after mixing, there is almost no difference, so it is clear that the polyfunctional resin compound used as the crosslinking agent and the crosslinked polymer are the same. It can be seen that almost no crosslinking reaction occurs even if the mixture is mixed in the aqueous system and allowed to stand for at least one month.Also, the epoxy-amine combination (Examples 1 and 3) which has a high reaction rate at room temperature
．． In 4), crosslinking almost completed after one month, but in the case of the epoxy-carboxyl combination with low reactivity (Example 2.5), crosslinking continued even after one month.

Note that the EMI used in Example 1 was 2000 Orpm,
10mj of liquid phase centrifuged for 1 hour! into a flask with a stopper, and add 1N-HCllCaClt reagent (HCj!47
．． 5 ml, CaC/z 405g, water 300
After adding 2 cc of g) and shaking at 30°C for 1 hour, add 5 cc of 0.5N-KOH type drug and add 0.5N-
The epoxy concentration in the aqueous phase determined by back titration with 11(1) solution was less than 0.01%.

The reason why both emulsions are stable even when mixed is that the presence of the polyfunctional compound in the aqueous phase is small and its solubility is low, and the polyfunctional compound is not emulsified by the surfactant in water. Based on these two principles, it can be thought that this is because the polyfunctional compound serving as the crosslinking agent is restricted from spreading into the aqueous phase and reacting with the second polymer.

[Brief explanation of drawings]

The drawing is a schematic diagram of the room temperature curable aqueous composition of the present invention.

Claims (2)

[Claims] (1) A room temperature curable aqueous composition characterized in that the following components (A) and (B) are dispersed in water in the form of fine particles. (A) A first polymer that captures a polyfunctional compound. (B) A second polymer having a functional group that reacts with a functional group of a polyfunctional compound in its molecular structure. (2) A polymer that captures a polyfunctional compound (first polymer) and a second polymer that has a functional group that reacts with the functional group of the polyfunctional compound in its molecular structure are each dispersed in water in the form of fine particles. By preparing a room-temperature-curing aqueous composition and applying the room-temperature-curing aqueous composition to the surface to be treated and volatilizing the water, the polyfunctional compound-trapping polymer and the polyfunctional compound in the molecular structure are combined. A method for using an aqueous room-temperature curable composition, which comprises forming a polymer film by bringing a functional group into contact with a polymer having a reactive functional group.