KR970005107B1 - Method for manufacturing water disperble resin and paint composition containing in thereof - Google Patents

Abstract

Process for manufacturing water dispersion resin is composed of i)reacting diisocyanate and above one of active hydrogen-containing polyol to give blocked isocyanate-containing urethane prepolymer, ii)reacting diisocyanate compound, above one of active hydrogen containing polyol, and active hydrogen-containing polyol which can form hydrophilic ion group to give isocyanate containing urethane prepolymer, iii)mixing two polymers obtained at 20-80 deg.C at agitating speed of 1,000-5,000rpm.

Description

Manufacturing method of water-dispersible resin for heavy corrosion protection and coating composition containing same

The present invention relates to a method for preparing a water-resistant resin for medium corrosion protection and a coating composition containing the same, and is suitable for a medium water-resistant paint, in particular, containers, steel buildings, etc., and a composition of a water-dispersible resin for finishing and a coating which can cope with current useful systems. It is about.

Currently, water dispersing urethanes have been widely applied in commercial applications, and in particular, the coating coverage of wood, plastics, metals, etc. by urethane alone or mixtures with acrylic has been expanded. The trend of watering and powdering in the paint market is to solve problems such as the government's regulation of global air pollution and the increase in the price of organic solvents that are increasing every year.

Manufacturing techniques for crosslinked water dispersible urethane resins are described in hydrophilic nonionic / potential ionic or urea-urethane polymer injections with dihydric and trihydric alcohols, as described in US Pat. No. 4,554,308. Method of obtaining a water dispersible urethane by inserting an ionic group, water dispersion and chain extender, and preparing a water dispersion crosslinked with a polyvalent amine after water dispersion by inserting a salt group into the urea-urethane injection. In U.S. Patent 4,408,008. However, the water-dispersible resin by the above method has a problem of weather resistance (ultraviolet resistance, water resistance, etc.), adhesion with primer, and problems such as blister generation due to coating softening in chemical resistance. . In general, the denseness of the coating film by the water-dispersible resin and the emulsion resin is highly dependent on the intergranular deposition effect, which is strongly influenced by the Tg, the minimum film forming temperature (MFFT), the co-solvent and the baking temperature of the resin. In particular, the fusion effect of the coating film at low baking temperature conditions is not only much lower than the high temperature (100 ℃ or more) but also appears to be a big problem in terms of physical properties. Therefore, the present invention compensates for the disadvantages of the physical properties of the crosslinkable urea-urethane dispersion resins by inducing a crosslinking reaction during the formation of the coating film, thereby improving the fusion and compactness of the coating film, and having good adhesion and water resistance to the above-mentioned channel. It is an object of the present invention to provide a method for producing an edible one-component aqueous dispersion resin and a coating composition containing the same.

The production method of the present invention for achieving the above object is 1) reacting a polyol containing at least one active hydrogen with a diisocyanate compound, and then preparing an isocyanate-containing urethane prepolymer blocked by a blocking agent, 2) Reacting a diisocyanate compound, a polyol containing at least one active hydrogen and a polyol capable of forming at least one hydrophilic ion group and having an active hydrogen, to prepare a urethane prepolymer containing an isocyanate, and 3) preparation It is composed of a step of mixing and dispersing the two kinds of the prepolymer well under ultrafast stirring.

That is, an isocyanate-containing urea-urethane prepolymer was prepared, mixed with an isocyanate-containing urea-urethane containing a hydrophilic nonionic / ionic group, and then dispersed under high-speed stirring, and the dispersed resin was polymer particles having a particle size of about 0.1 to 5 μm. Is a state in which water is stably dispersed in water. At this time, isocyanate-containing urea-urethane is a one-component type self-crosslinking urea-urethane urethane dispersion resin composition which reacts with water to be converted into an amine group and reacts with blocked isocyanate at a small temperature at the time of forming a coating to crosslink the coating. In addition, the composition of the paint containing the same is limited to the top coat for the medium anticorrosive, and the coating system for the optimum effect uses epoxy zinc rich primer which is generally useful as the bottom.

Hereinafter, the present invention will be described in more detail.

The manufacturing process of the blocked isocyanate water dispersion resin is prepared by three steps as follows.

1) The diisocyanate monomer and the active hydrogen-containing polyol monomer are reacted in an equivalent ratio of 1.1: 1 to 5.0: 1, and then the remaining isocyanate is blocked with a blocking agent.

2) It is possible to form at least one salt group in the diisocyanate monomer, and to prepare an isocyanate-containing prepolymer by reacting a polyol having active hydrogen in an equivalence ratio of 0.1: 1 to 5.0: 1, and the rest of the carboxyl groups by amine neutralization. After forming a salt,

3) The prepolymers of 1) and 2) above are well stirred and dispersed in water.

At this time, the existing isocyanate groups react with excess water to form an amine group-containing prepolymer or react faster with isocyanate than water and contain at least two active hydrogens for isocyanates such as ammonia, primary Or react with an excess of secondary amines to produce an amine group-containing prepolymer. The isocyanate monomer is reacted with an active hydrogen-containing polyol in the presence of an inert gas to react with an amine group-containing polyol, and the reaction temperature is maintained at 30 to 130 ° C, preferably 60 to 100 ° C, and reacted with the isocyanate-containing prepolymer prepared. The reaction temperature with the convex agent is maintained at 40 to 120 ° C, preferably 60 to 100 ° C, and the reaction is carried out. At this time, if the NCO content is too high, the urea bonds increase with respect to the total solids, which tends to make coating film difficult.

The diisocyanate monomer in step 2) is capable of forming at least one or more salts with the active hydrogen-containing polyol under an inert gas atmosphere and undergoes a separate neutralization step with a polyol ([HO] 2-R-COOH) containing active hydrogen. 5-sodiumsulfurisophthalic acid which can be solubilized without passing through alone or mixed and reacted with an equivalent ratio of 1.1: 1 to 5.0: 1 is mixed with the one prepared in step 1), and the temperature is maintained at 20 to 80 ℃, The water dispersion is maintained at 20 to 80 ° C., preferably at 30 to 60 ° C. for reaction, and the stirring speed is 500 to 10,000 rpm, preferably 1,000 to 5,000 rpm. The NCO content in steps 1) and 2) is 1.0-20%, preferably 3-10%, and the active hydrogen-containing carboxylic acid is 10% by weight or less, preferably 4-6% by weight of the carboxylic acid. Neutralizers include primary, secondary or tertiary amines but preferably tertiary amines are suitable. Examples include trimethylamine, triethylamine, triisopropylamine, tributylamine, N, N-dimethyl-cyclohexylamine, N, N-dimethylstearylamine, N, N-dimethylanaline, N-dimethylmo Porin, N-ethylmorpholine, N-methylpiperazine, N-methylpyrrolidine, N-methylpiperidine, N, N-dimethyl-ethanolamine, N, N-dimethyl-ethanolamine, N, N- Dimethyl-ethanolamine, triethanolamine, N-methyldiethanolamine, dimethylaminopropanol, 2-methoxyethyldimethyl amine, N-hydroxyethylpiperazine, 2- (2-dimethyliminoepoxy) -ethanol and 5- It is diedylamino-2-pentanone, and more preferably, amines having a low boiling point are reacted with carboxylic acid to become salts, and are easily decomposed and volatilized when forming a coating film, thereby improving the effect on water resistance. Solid content of water dispersion resin at this time is 20 to 80 weight%, Preferably it is 30 to 50 weight%.

Isocyanate monomers in steps 1), 2) and 3) can be represented by the general formula

R (NCO) ₂

R represents an organic group except for isocyanate, has a molecular weight of about 112 to 1,000, preferably about 140 to 400. Alifadic or cycloaliphada have advantageous properties in terms of UV resistance and weather resistance, but can be selected and mixed with an appropriate diisocyanate monomer depending on the required coating performance. Useful isocyanates include 2,2,4-trimethylhexamethylene diisocyanate (TMDI), 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate (HDI). Isophorone diisocyanate (IPDI), 4,4'-methylene-bis- (cyclohexylene diisocyanate) α, α'-xylene diisocyanate, and suitable aromatic diisocyanate monomers are toluene diisocyanate, 2,4,6- And isocyanate toluene, 4,4,4-triisocyanate triphenylmethane, 1,2,4-benzene triisocyanate and the like, and suitable aromatic diisocyanate monomers are toluene diisocyanate, 1,4-phenylene diisocyanate, 4,4 '-Diphenylmethane diisocyanate, meta or para-tetramethylxylene diisocyanate, and the like are used alone or in combination of two or more.

The active hydrogen-containing polyols useful in the processes of steps 1) and 2) contain an average molecular weight of 60 to 6,000, at least one active hydrogen, and the hydroxyl group is on the order of 20 to 1,000 mg KOH / g. Examples include ethylene glycol, propylene glycol, neopentyl glycol, butane diol, hexane diol and the like, and cyclo aliphadic diols include 1,4-cyclohexane diol, 4,4'-dihydroxy cyclohexyl, 2,2-propane and the like. Ethyl diols include polyethylene oxide diols, polyethylene oxide propylene diols, polytetramethylene oxidediols, and the like. The trihydric alcohols include trimethylolpropane and trimethylol ethane, which are used alone or in combination of two or more thereof.

The polyesters are prepared using the above-mentioned alcohols and dihydric and trivalent acids, which are used in the present invention, such as trimellitic inhydride, terephthalic acid, phthalic anhydride, fumaric acid, maleic acid, adipic acid, seba Food acid, cyclohexane dicarboxylic acid, isophthalic acid, phthalic acid and the like.

Depending on the type of polyol used and the position of the diisocyanate to be adducted, the flexibility or strength of the final composite can be freely adjusted. In addition, the polymerization catalyst used at this time is to accelerate the urethane reaction, triethyl diamine, morpholine, normal-ethyl- morpholine, piperazine, triethanol, which are generally known as amines or organometallic compounds (mainly TIn-based compounds). Amine, triethylamine, dibutyltin tilaurate, stanococtoate, dioctyltin diacetate, dioctate, stannous oleate, stannous talate, dibutyltin oxide, etc. It is used at about -0.1 weight%. Prepolymers can be prepared using inert solvents in isocyanate-addition polymerization reactions, which are generally organic compounds containing no oxygen or nitrogen atoms. Solvents are not necessarily used in the preparation of isocyanate-containing prepolymers, but the reactants may be present in the liquid phase, or the heat of reaction may be adjusted to increase the dispersing effect during dispersion and dimethylformamide, esters, ethers, Ketoesters, ketones, namely methyl ethyl ketone, acetone, glycol-ether-ester, carbon tetrachloride and aliphatic and alicyclic hydrocarbon pyrrolidones. In particular, dimethylformamide and n-methyl-2-pyrrolidone, which have a higher boiling point than water, are present in the urea-urethane aqueous dispersion even at high temperatures, thereby enhancing the fusion effect between the urea-urethane prepolymer particles when forming a coating film. do.

At this time, the carboxylic acid having an active hydrogen atom is 10% by weight or less, preferably 4 to 6% by weight, and more preferably used in combination with a polyether type. However, when only hydrophilic ionic groups are used, it may cause instability due to addition of electrolytes (salts, acids, bases) and low temperatures. Excessive introduction of hydrophilic nonionic groups reduces the solubility of polyether type water during heat storage. Proper mixing of hydrophilic ions and nonionic groups is necessary to maintain a stable dispersion state, as this may lead to instability. At this time, the carboxyl group represented as a branched structure forms a salt using 50 to 150% of tertiary amine.

The blocking adducts of the isocyanate-containing prepolymers by the blocking agent of step 1) are prepared by the following example and the reaction with the active hydrogen-containing prepolymer upon deblocking is as follows.

R (OH) _n + OCN-R'-NCO → (R-OCONH-R'-NCO) _n

(R-OCONH-R'-NCO) _n + nHa → (R-OCONH-R'-NHCOA) _n

(R-OCONH-R'-NHCOA) _n + nRH->(R-OCONH-R'-NHCO-R) _n

Wherein R, R 'is an organic compound containing at least one active hydrogen and RH is an active hydrogen-containing urea-urethane prepolymer having an average molecular weight of about 60 to 30,000. n represents at least one functional group and HA is a blocking monomer containing one active hydrogen. Then, the diosocyanate monomer and the active hydrogen-containing polyol monomer are reacted in an equivalent ratio of 1.1: 1 to 5.0: 1, and then the remaining isocyanate group is blocked with a bloxing agent. Useful blocking agents include oximes such as acetone oxime, butanone oxime, cyclohexanone oxime, cyclopentanone oxime, acetophenone oxime and benzophenone oxime and phenols, m-cresol, o-chlorophenol and p-toluene Phenolic and ethols such as thiol, p-nitrophenol, ethylacetoate, diethyl malonate, alcohols and amines include methanol, ethanol, n-propanol, n-butanol, n-pentanol, isopropanol, m-hydro Perfluoro alcohol, 1-chloro-2-propanol, 1,3-dichloro-2-propanol, ethylenechlorohydrin, 2,22-tripoloroethanol, di-n-butylamine, N-hydroxyphthalamide , N, N-diethylhydroxylamine, 2-hydroxypyridine, 3-hydroxypyridine, 4-hydroxypyridine, pyridine, N-oxide, 8-hydroxyquinoline, 8-hydroxyquinoline, 6-chloro 2-hydroxypyridine, 3-hydroxypyridine, N-oxide, 2-mercaptopy Lidine, 3-methyl-1-phenyl-pyrazolin-5-one, 3-methyl-2-pyrazolin-one, N-phenylhydroxyamine, 2-diethylaminoethanol, N-ethyl-N-phenylethanol Amine, 2-mecapto-1-methylimidazole, and other compounds include dimethyl phosphide, caprolactam, acetohydroxamic acid, p-toluenesulfonamide, diethylmeritric acid, thioglycolic acid, thioacetic acid , Thiobenzoic acid, acetone phenylhydrazone, p-toluenesulfonic acid, and the like.

Since the rate of pyrolysis differs depending on the temperature and the type of isocyanate, a suitable choice is required by the subdivision temperature for forming the coating film.

Therefore, the hydrophobic blocked isocyanate prepolymer prepared according to the above method is dispersed with the isocyanate-containing prepolymer of step 2) and crosslinked by reacting with the amine group-containing prepolymer according to the evaporation of water and thermal decomposition of the blocked isocyanate when forming a coating film. It will form a ized film. Since the coating film thus formed blocked the remaining NCO group of the product prepared in step 1 with a blocking agent, the product prepared in step 2 was present in the micelle in a few minutes, so that internal bonding was not performed between the particles, and crosslinking was subsequently formed during the film formation. Since the crosslinking is made according to the coating film formation compared to the pre-crosslinked urea-urethane dispersion, it is possible to obtain a more dense coating film and has advantages for chemical resistance and water resistance.

Especially for heavy coatings by mixing with water-dispersible resins or general acrylic emulsion resins produced by the process of the invention. When applied to a top coat for containers, PVC (pigment volume comtent) is 5 to 50% by weight, preferably 10 to 20% by weight, coarse solvent is 1 to 20% by weight, preferably 3 to 10% by weight As the solvent, alcohols and glycols such as dimethyl formamide, n-methyl-2-pyrrolidone, 2-ethylhexanol, texanol and octanol, which are higher in boiling point than water, especially butyl cellulsolve and butyl carby Tolls and the like are used. If necessary, a small title, an enhancer, and a dispersant are added to improve the workability of the paint, and the working and coating conditions are as follows.

1) After surface treatment (Blasting) the specimen (Sa 21/2),

2) Apply 40 µm of Epoxy Zine Rich Primer (Korea Chemicals EP 175 (C)) and dry at room temperature (25 ° C) for about 10 minutes.

3) A container topcoat paint using a water-dispersible resin as a binder is a dry coating film. The humidity is 40 to 80%, the temperature is 23 ± 5 ℃ and the air velocity is about 2m / sec using airless or air spray. Under the condition, the coating is applied to a thickness of about 80 μm, and the flash off time is maintained at about 10 minutes at room temperature, followed by drying at 75 ° C. for 30 minutes or at room temperature (25 ° C.) for 3 to 5 hours.

The following examples and comparative examples will be described in more detail the manufacturing method of the water-dispersible resin of the present invention and the coating composition containing the resin, but is not intended to limit the scope of the present invention.

Example 1

(I) Preparation of Blocked Isocyanate Urethane Prepolymer

Into a 1-lead four-necked flask equipped with a stirrer, a thermometer, a dropping tank, a nitrogen injection tube and a reflux condenser, 104.0 g of trimethol propane, 60.0 g of neopentyl glycol, and 33.5 G of N-methylpyrrolidone were added to a nitrogen atmosphere. It heated up to 50 degreeC under 50mL of toluene diisocyanate without a catalyst over 1 hour, and it was made to react for 2 hours, maintaining 50 degreeC. Subsequently, after approval at 60 ° C., 169.1 g of acetone oxime was added and reacted at 60 ° C. for 2 hours to block residual isocyanate. After the fattening reaction is completed, it is cooled to room temperature.

(II) Preparation of Isocyanate-Containing Prepolymer and Water Dispersion with Blocked Isocyanates

Polypropylene glycol (Hydroxyl number 108.7mg KOH / g) 74.1g, Polypropylene glycol (Hydroxyl number 55.6mg) in a 2-liter four-necked flask equipped with a stirrer, thermometer, dropping tank, nitrogen inlet tube and reflux condenser KOH / g) 284.9 g, dimetholol propionic acid 41.5 g, N-methylpyrrolidone 32.5 g, 0.33 g of dibutyltin dilaurate as a catalyst were added thereto, and the temperature was raised to 80 ° C. under a nitrogen atmosphere to 248.5 g of toluene diisocyanate. Was added dropwise over 1 hour and then maintained at 80 ° C. for 4 hours. Subsequently, the reaction temperature was cooled to 60 ° C., and 67.1 g of triethylamine was added dropwise over 15 minutes, held for 30 minutes, then cooled to 50 ° C., and the adapter of (I) was added at a ratio of 1 to 1% by weight and stirred well. Then cooled to room temperature.

The well mixed prepolymer mixture is dispersed at 2000 rpm while maintaining the temperature of 30 DEG C under ultra high speed stirring.

In this manner, a resin having excellent water dispersibility is prepared, and its specifications are shown in Table I.

Example 2

(I) Preparation of Blocked Isocyanate Urethane Prepolymer

Polycaprolactone triol (Union Carbide Chem: Hydrxyl number 187mg KOH / g) 69g, polypropylene glycol (Hydroxyl number) in a 1 liter four-necked flask equipped with a stirrer, thermometer, dropping tank, nitrogen injection tube and reflux condenser 108.7mg KOH / g) 87.7g, 12.8g N-methylpyrrolidone was added, and then 100g of toluene diisocyanate was maintained at 60 ° C for 2 hours, and then 54.7G of acetone oxime was added for 2 hours to block. Isocyanate is prepared.

(II) Preparation of Isocyanate-Containing Prepolymer and Water Dispersion with Blocked Isocyanates

Polyester diol (1.6 hexanediol / neopentyl glycol / adipic acid: Hydroxul number 62.2 mg KOH / g) 320.2 g in a 1-lead four-necked flask equipped with a stirrer, thermometer, dropping tank nitrogen loading and reflux condenser 24.4 g of dimethol propionic acid, 0.23 g of dibutyl tin dilaurate and 22.5 g of N-methylpyrrolidone were added as a catalyst, and 105.3 g of toluene diisocyanate was reacted for 4 hours at 80 ° C., followed by reaction temperature. Was cooled to 60 ° C., and 18.4 g of triethylamine was added dropwise over 15 minutes, held for 30 minutes, cooled to 50 ° C., and the adduct of (I) was added at the same equivalence ratio as the remaining isocyanate group of (II) and stirred well. Then cooled to room temperature. The well mixed prepolymer mixture is dispersed while maintaining at 30 ° C. under ultra-high stirring at 2000 rpm.

In this manner, a water-dispersible resin having excellent water dispersibility is prepared, and its specifications are shown in Table 1.

Example 3

(I) Preparation of Blocked Isocyanate Urethane Prepolymer

Into a 1 liter four-necked flask equipped with a stirrer, thermometer, dropping tank, nitrogen injection tube and reflux condenser, 116.8 g of trimethol propane, 68.0 g of neopentyl glycol, and 37.6 g of N-methylpyrrolidone were added to a nitrogen atmosphere. It heated up to 50 degreeC under the following, and 567.0 g of toluene diisocyanate is dripped without a catalyst over 1 hour, and it is made to react for 2 hours, maintaining 50 degreeC. Subsequently, after raising the temperature to 60 ° C, 180.0 g of acetone oxime was added and reacted at 60 ° C for 2 hours to block residual isocyanate. After the fattening reaction is completed, it is cooled to room temperature.

(II) Preparation of Isocyanate-Containing Prepolymer and Water Dispersion with Blocked Isocyanates

140.6 g of polycaprolactone diol (Union Carbide Chem .: Hydroxyl number 108.7 mg KOH / g) in a 1 liter four-necked flask equipped with a stirrer, thermometer, dropping tank, nitrogen injection tube and reflux condenser Hydroxyl number 108.7mg KOH / g) 118.6g, dimetholpropionic acid 18.7g, 0.21g of dibutyltindilaurate and 21.2g of N-methylpyrrolidone were added as a storage medium, followed by 146.0g of isophoronediasocyanate. The reaction mixture was added dropwise at 90 ° C. over 1 hour, and maintained at 90 ° C. for 4 hours. Then, the reaction temperature was cooled to 60 ° C., and 14.1 g of triethylamine was added dropwise over 15 minutes. The adduct of (I) is added in the same equivalence ratio as the remaining isocyanate of (II), stirred well and cooled to room temperature.

The well mixed prepolymer mixture is water dispersed at 30 ° C. under ultra-high stirring at 2000 rpm.

In this manner, a water-dispersible resin having excellent water dispersibility is prepared, and its specifications are shown in Table 1.

Example 4

(I) Preparation of Blocked Isocyanate Urethane Prepolymer

526 g of polycaprolactone triol (Hydroxyl number 310 mg KOH / g) in a 1 liter four-necked flask equipped with a stirrer, a thermometer, a dropping tank, a nitrogen injection tube and a reflux condenser, 126.2 g of neopentyl glycol, N-methyl glycerol 43.6 g of ton was added and heated to 50 ° C. under a nitrogen atmosphere, and 526.0 g of toluene diisocyanate was added dropwise over 1 hour without a catalyst to react for 2 hours while maintaining 50 ° C. Subsequently, the mixture is reacted at 60 ° C. for 2 hours to block residual isocyanate. After the fattening reaction is completed, it is cooled to room temperature.

(I) Preparation of Blocked Isocyanate Urethane Prepolymer

(II) Preparation of Isocyanate-Containing Prepolymer and Water Dispersion with Blocked Isocyanates

526g polycaprolactonetriol (Hydroxyl nyber 310mg KOH / g) in a 1 liter four-necked flask equipped with a stirrer, thermometer, dropping tank, nitrogen inlet tube and reflux condenser, 1262.2 g of neopentylglycol, N-methylpyrroli After adding 43.6 g of ton without a catalyst, 526.0 g of toluene diisocyanate was added dropwise over 1 hour, reacted for 2 hours while maintaining 50 ° C, and the reaction temperature was cooled to 60 ° C to give 85.4 g of triethylamine over 15 minutes. After dropping, the mixture was kept for 30 minutes, cooled to 50 ° C, and the (I) adduct was added at the same ratio as the remaining isocyanate group of (II), stirred well, and cooled to room temperature.

The well mixed prepolymer mixture is dispersed while maintaining at 30 ° C. under 2000 rpm ultrafast stirring.

In the above method, a water-dispersible resin having excellent water dispersibility is prepared, and its specifications are shown in Table 1.

[Examples 5 to 8]

Water-soluble top coat composition for container

Additives such as water-disperse resins, colored pigments, coloring pigments, dispersants (BB), antifoaming agent (BB), pH adjusting agent (BB), antimicrobial agent (BB), medium agent (BB) prepared in Examples 1 to 4 The water-soluble top coat for the container was prepared by mixing, and the results of the mixing and the coating application and the comparison of the physical properties are shown in Table 2 and Table 3, respectively.

Comparative Example 1

Water-soluble top coat composition for container

A water-soluble topcoat was prepared in the same manner as in Examples 5-8 using the water-dispersible resin F-57 (pre-corosslinked polyurethane dispersion type: Union Specialty Co. trade name). The physical property comparison is shown in Table 2 and Table 3, respectively.

Comparative Example 2

Water Soluble Paint Composition For Containers

A water-soluble topcoat for containers was prepared using the water-dispersible acrylic emulsion resin xp341sc (DSM, trade name) in the same manner as in Examples 5 to 8. Table 2 and Table 1 show the results of the application test and the comparison of properties, respectively. 3 is shown.

Claims (14)

Method for producing a one-component water dispersion resin, characterized in that consisting of the following steps 1) reacting a diisocyanated compound with a polyol containing at least one active hydrogen and then preparing a blocked isocyanate-containing urethane prepolymer by a blocking agent, 2) a ⓐ diisocyanated compound, ⓑ at least 1 Reacting a polyol containing at least one active hydrogen and a polyol capable of forming at least one hydrophilic ion group and having active hydrogen, followed by neutralization to produce an isocyanate containing urethane prepolymer, and 3) the two prepared Mixing and dispersing the prepolymer of the kind well under ultra-high stirring. The method of claim 1, wherein the diisocyanated compound of step 1) and the compound containing at least one active hydrogen are reacted in an equivalent ratio of NCO: OH = 1.1: 1 to 5.0: 1. Method for producing dispersed resin. The method of claim 1, wherein the equivalent ratio NCO: OH = 1.1: 1 to 5.0: 1 in the reaction of step 2). The method of claim 1, wherein the temperature of step 3) is 20 to 80 ℃, the stirring speed is 1,000 to 5,000rpm. The method of claim 1, wherein the neutralization of step 2) is characterized in that the amine neutralization method to neutralize the remaining carboxyl groups. The diisocyanate component of the blocked isocyanate-containing prepolymer and the active isocyanate-containing prepolymer, wherein the NCO-containing diisocyanate (CON-R-NCO) monomer is mixed alone or in combination of two or more of the aliphatic or cycloaliphatic diisocyanate. Method for producing a one-component water dispersible resin, characterized in that. 2. The active hydrogen-containing polyol (OH-R-OH) according to claim 1, wherein the polyol (ⓑ) containing at least one active hydrogen has an average molecular weight of 60 to 6000 and a hydroxy value of 20 to 1000 mg KOH / g. A method for producing a one-component water dispersion resin, characterized in that used alone or in combination of two or more. The method of claim 7, wherein the polyol is one or a mixture of aliphatic diols, cyclo aliphatic diols, and polyether diols. The method of claim 1, wherein the polyol (ⓒ) contained in the active isocyanate-containing urethane copolymer of step 2) is an active hydrogen-containing carboxylic acid capable of forming a hydrophilic ion group. 10. The method according to claim 9, wherein the active hydrogen-containing carboxylic acid is used at 10% by weight or less of the total solids. The method of claim 1, wherein the isocyanate-containing prepolymer prepared in step 1) and the blocking agent are reacted at 40 to 120 ° C. The method of claim 1, wherein the isocyanate content in step 1) and step 2) is 1.0-20%, respectively. A coating composition, comprising a water-dispersible resin and a co-solvent prepared by the method of claim 1. The coating composition according to claim 13, wherein the co-solvent is contained in an amount of 10 to 2% by weight based on the total coating composition.