CN108840992B - Water-based ink composition, water-based ink resin and preparation method and application thereof - Google Patents

Abstract

The invention relates to the field of water-based ink, and discloses a water-based ink composition, a water-based ink resin, and a preparation method and application thereof. An aqueous ink composition. Wherein, the composition comprises the following components in percentage by weight: (1) 20-35 wt% of a hydroxyl-terminated polyamide-ether resin; (2) 5-15 wt% of diisocyanate; (3) 2-10 wt% of a glycol; (4) 2-10 wt% of diamine sulfonate; (5) 1-6 wt% of epoxy alcohol; (6) 45-65 wt% of water. The water-based ink resin prepared from the water-based ink composition has good adhesion fastness and good printability. After the water-based ink prepared from the water-based ink resin is printed on a packaging base material, the water-based ink has the advantages of water boiling resistance and boiling resistance.

Description

Water-based ink composition, water-based ink resin and preparation method and application thereof

technical field

The invention relates to the field of water-based inks, in particular to a water-based ink composition, a water-based ink resin and a preparation method and application thereof.

Background technique

High-temperature cooking food is popular among consumers because of its long shelf life, which can be eaten cold or hot, and easy to carry. This type of food usually needs to undergo high temperature boiling or steaming process after packaging, so higher requirements are placed on the packaging of food. It is not only required that the packaging substrate can withstand the test of high temperature, but also the packaging bag after printing and compounding is required to have high compound strength. With the strengthening of domestic environmental awareness, my country's flexible packaging ink products are developing rapidly in the direction of environmental protection and hygiene. Water-based ink is non-toxic, non-irritating, non-corrosive, non-flammable, non-explosive, safe to use, and has no harm to the environment and human body. It is a typical green environmental protection product.

CN104059429B discloses a water-soluble inner printing composite plastic ink using water-soluble acrylic modified resin as ink connecting material. Due to the poor adhesion of this type of water-soluble resin to the substrate, it cannot meet the requirements of resistance to boiling and retorting.

Waterborne polyurethane is an environmentally friendly material with water as the dispersion medium, and is widely used in adhesives, coatings, leather, textile auxiliaries, medicine and health, building materials and printing. The development of water-based inks using water-based polyurethane as the ink binder has attracted extensive attention from researchers. US5470907 discloses a method for preparing an aqueous polyurethane emulsion using dimethylolpropionic acid as a hydrophilic chain extender, but due to the catalytic hydrolysis of carboxyl groups, the prepared polyurethane emulsion has poor hydrolysis resistance after film formation . Therefore, water-based polyurethane in the usual sense is difficult to meet the retort-resistant packaging requirements under the action of high temperature, high humidity, and water vapor penetration.

In recent years, ink for ordinary light packaging has gradually increased in the market. However, as a water-based ink for retort-resistant packaging, the current effect is unsatisfactory. Therefore, the development of water-based ink that is resistant to boiling and retorting has become an inevitable step in the environmental protection of ink.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problems that the water-based ink for packaging existing in the prior art cannot meet the problems of resistance to boiling and cooking, and to provide water-based ink compositions, water-based ink resins, and preparation methods and applications thereof, prepared from the water-based ink compositions of the present invention. The water-based ink resin has good adhesion fastness and good printability. After the water-based ink prepared by the water-based ink resin is printed on the packaging substrate, it has the advantages of water boiling resistance and retort resistance.

In order to achieve the above object, a first aspect of the present invention provides a water-based ink composition, wherein, by weight percentage, the composition contains the following components:

Preferably, the hydroxyl value of the hydroxyl-terminated polyamide-ether resin is 28-56 mg(KOH)/g.

Preferably, the hydroxyl-terminated polyamide-ether resin is hydroxyl-terminated polyamide-polyoxyethylene glycol resin, hydroxyl-terminated polyamide-polyoxypropylene glycol resin, hydroxyl-terminated polyamide-polytetrahydrofurandiol resin, hydroxyl-terminated polyamide-polytetrahydrofurandiol resin At least one of polyamide-propylene oxide-ethylene oxide copolymerized glycol resin, hydroxyl-terminated polyamide-tetrahydrofuran-propylene oxide copolymerized glycol resin, and hydroxyl-terminated polyamide-tetrahydrofuran-ethylene oxide copolymerized glycol resin.

Preferably, the diisocyanate is at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dimethylene benzene diisocyanate and dicyclohexylmethane diisocyanate. A sort of.

Preferably, the diol is 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, neopentyl glycol, 1,2-cyclohexane Diol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, hydrogenated bisphenol A, 2-isopropyl-1,4-butanediol, 3-methyl-1,5-pentane At least one of diol and 2,4-dimethyl-1,5-pentanediol.

Preferably, the diamine sulfonate is sodium 2-(2-amino-cyclohexylamino)-ethanesulfonate, 2-[(5-amino-1,3,3-trimethyl-cyclohexane Methyl)-amino]-ethanesulfonate, sodium 2-[4-(4-amino-cyclohexylmethyl)-cyclohexylamino]-ethanesulfonate, N-(2-aminoethyl)-aminoethyl At least one of sodium alkanesulfonate, sodium ethylenediaminoethanesulfonate, sodium 2,4-diaminobenzenesulfonate, and sodium 2,6-diaminobenzenesulfonate.

Preferably, the epoxy alcohol is glycidol and/or epoxybutanol.

A second aspect of the present invention provides a method for preparing a water-based ink resin from the above-mentioned water-based ink composition, wherein the method comprises the following steps:

(1) carry out the first reaction with the hydroxyl-terminated polyamide-ether resin and diisocyanate, and add dihydric alcohol to carry out the second reaction, reduce to room temperature and add acetone, then add diamine sulfonate to carry out the third reaction, And add epoxy alcohol to carry out the 4th reaction, obtain polymer;

(2) The polymer is contacted with water to disperse, and acetone is removed to obtain an aqueous ink resin.

According to a specific embodiment of the present invention, the method for preparing the water-based ink resin from the above-mentioned water-based ink composition can be:

(1) add hydroxy-terminated polyamide-ether resin and diisocyanate into reactor I, heat to 80～100° C., react for 1～2 hours, add dihydric alcohol to react for 1～2 hours, reduce to room temperature and add an appropriate amount of acetone The viscosity of the reactant is reduced, diamine sulfonate is added, the reaction is stirred at room temperature for 0.5-1 hour, the temperature is raised to 60-70° C., and epoxy alcohol is added to react for 1-2 hours to obtain a polymer.

(2) adding water to the reaction kettle II, under stirring, pour the polymer in the reaction kettle I into the reaction kettle II, continue to stir and disperse at room temperature for 0.5 to 1 hour, and remove the acetone by vacuuming to obtain the water-based solution. Ink resin.

The third aspect of the present invention provides the water-based ink resin prepared by the above method.

The fourth aspect of the present invention provides the application of the above-mentioned water-based ink resin in inks, coatings and adhesives.

By using the hydroxyl-terminated polyamide-ether resin as the soft segment, the invention improves the adhesion fastness of the water-based ink resin and the packaging substrate, and avoids the polymer caused by the poor hydrolysis resistance of the ester bond when ordinary polyester is used. degradation problem. Secondly, by using diamine sulfonates as chain extenders, the present invention reduces the content of hydrophilic groups in the polymer while maintaining the molecular weight of the water-based polyurethane, thereby improving the water resistance of the water-based ink resin. . Moreover, by introducing epoxy groups (epoxy alcohols) in the present invention, the subsequent crosslinking and curing of the water-based ink resin can be performed, which greatly improves the adhesion of the water-based ink resin. The combination of the above points reduces the damaging effect of water vapor on the water-based ink resin under high temperature and high humidity conditions, and improves the water-based ink's resistance to boiling and cooking.

Detailed ways

The endpoints of ranges and any values disclosed herein are not limited to the precise ranges or values, which are to be understood to encompass values proximate to those ranges or values. For ranges of values, the endpoints of each range, the endpoints of each range and the individual point values, and the individual point values can be combined with each other to yield one or more new ranges of values that Ranges should be considered as specifically disclosed herein.

A first aspect of the present invention provides a water-based ink composition, wherein, in percent by weight, the composition contains the following components:

In the present invention, the hydroxyl value of the hydroxyl-terminated polyamide-ether resin may be 28-56 mg(KOH)/g, and the hydroxyl-terminated polyamide-ether resin under this hydroxyl value is more conducive to improving the water-based ink resin of the present invention Fastness of adhesion to substrates.

In the present invention, the hydroxy-terminated polyamide-ether resin can be used as a soft segment and has hydrolysis resistance for the purpose, such as but not limited to: hydroxy-terminated polyamide-polyoxyethylene glycol resin, hydroxy-terminated polyamide -Polyoxypropylene glycol resin, hydroxyl terminated polyamide-polytetrahydrofuran glycol resin, hydroxyl terminated polyamide-propylene oxide-ethylene oxide copolymerized glycol resin, hydroxyl terminated polyamide-tetrahydrofuran-propylene oxide copolymerized glycol resin, hydroxyl terminated At least one of polyamide-tetrahydrofuran-ethylene oxide copolymerized glycol resins.

In the present invention, the diisocyanate can be, but is not limited to: toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dimethylene benzene diisocyanate, bicyclic At least one of hexylmethane diisocyanate.

In the present invention, the dihydric alcohol as a chain extender can be, but not limited to: 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol , neopentyl glycol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, hydrogenated bisphenol A, 2-isopropyl-1,4-butanediol At least one of alcohol, 3-methyl-1,5-pentanediol, and 2,4-dimethyl-1,5-pentanediol.

In the present invention, the diamine sulfonate is used as a chain extender for the purpose of improving the molecular weight of the water-based polyurethane and reducing the content of hydrophilic groups in the polymer, for example, but not limited to: Sodium 2-(2-Amino-cyclohexylamino)-ethanesulfonate, 2-[(5-Amino-1,3,3-trimethyl-cyclohexylmethyl)-amino]-ethanesulfonate, 2 -[4-(4-Amino-cyclohexylmethyl)-cyclohexylamino]-sodium ethanesulfonate, sodium N-(2-aminoethyl)-aminoethanesulfonate, sodium ethylenediaminoethanesulfonate , at least one of sodium 2,4-diaminobenzenesulfonate and sodium 2,6-diaminobenzenesulfonate.

In the present invention, the epoxy alcohol can promote post-crosslinking curing, for example, but not limited to: glycidol and/or epoxybutanol.

A second aspect of the present invention provides a method for preparing a water-based ink resin from the above-mentioned water-based ink composition, wherein the method comprises the following steps:

(1) carry out the first reaction with the hydroxyl-terminated polyamide-ether resin and diisocyanate, and add dihydric alcohol to carry out the second reaction, reduce to room temperature and add acetone, then add diamine sulfonate to carry out the third reaction, And add epoxy alcohol to carry out the 4th reaction, obtain polymer;

(2) The polymer is contacted with water to disperse, and acetone is removed to obtain an aqueous ink resin.

According to the method of the present invention, the conditions of the first reaction include, but are not limited to, a temperature of 80-100° C. and a time of 1-2 hours.

According to the method of the present invention, the conditions of the second reaction include, but are not limited to, a temperature of 80-100° C. and a time of 1-2 hours.

According to the method of the present invention, the conditions of the third reaction include but are not limited to: the temperature is room temperature and the time is 0.5-1 h.

According to the method of the present invention, the conditions of the fourth reaction include, but are not limited to: a temperature of 60-70° C. and a time of 1-2 hours.

According to the method of the present invention, the dispersion conditions may include but are not limited to: the temperature is room temperature, and the time is 0.5-1 h.

According to the method of the present invention, the acetone can reduce the viscosity of the reactants and can be stirred uniformly. The amount of acetone added depends on the viscosity of the reactants. If the viscosity is too large, the amount of acetone can be appropriately increased. If the viscosity If it is smaller, the amount of acetone can be appropriately reduced, because the step of removing acetone is performed in step (2), so the amount of acetone added can be appropriately added as required.

The third aspect of the present invention provides the water-based ink resin prepared by the above method.

The water-based ink resin has good adhesion and good printability, is environmentally friendly and can meet the packaging requirements of different grades of boiling and cooking.

The fourth aspect of the present invention provides the application of the above-mentioned water-based ink resin in inks, coatings and adhesives.

Among them, after the ink prepared with the water-based ink resin of the present invention is used as a packaging substrate, the requirements of water boiling resistance and retort resistance can be met.

The application of the above water-based ink is not limited to this.

The present invention will be described in detail below by means of examples.

Example 1

(1) 15kg hydroxy-terminated polyamide-polyoxyethylene glycol resin (hydroxyl value 32mg (KOH)/g), 6kg hydroxy-terminated polyamide-tetrahydrofuran-propylene oxide copolymerized diol resin (hydroxyl value 36mg (KOH)) /g) and 13kg toluene diisocyanate are added in the reactor 1, after being heated to 80 DEG C of reaction for 2 hours, adding the 2,2-dimethyl-1,3-propanediol of 7kg and reacting for 1.2 hours, down to room temperature and adding an appropriate amount of acetone to reduce The viscosity of the reactant, add 10kg of 2-(2-amino-cyclohexylamino)-sodium ethanesulfonate, stir and react at room temperature for 0.6 hours, heat up to 60 ° C, add 4kg of glycidol and react for 1.8 hours to obtain the polymer .

(2) Add 45kg of water to the reaction kettle II, under stirring, pour the polymer in the reaction kettle I into the reaction kettle II, continue stirring and dispersing at room temperature for 0.5 hours, remove the acetone by vacuuming, and obtain the water-based ink resin.

Example 2

(1) 27.5kg terminal hydroxyl polyamide-polyoxypropylene glycol resin (hydroxyl value is 40mg (KOH)/g), 4kg diphenylmethane diisocyanate and 6kg dicyclohexylmethane diisocyanate are added in reactor 1, Heated to 90°C, reacted for 1.4 hours, added 2kg of 2-ethyl-2-butyl-1,3-propanediol and reacted for 1 hour, cooled to room temperature, added an appropriate amount of acetone to reduce the viscosity of the reactant, added 7kg of 2-[ (5-Amino-1,3,3-trimethyl-cyclohexylmethyl)-amino]-sodium ethanesulfonate, stirred at room temperature for 0.75 hours, heated to 65°C, added 3.5kg of epoxybutanol and reacted for 1.4 hours After the polymer was obtained.

(2) 50kg of water was added to the reaction kettle II, and under stirring, the polymer in the reaction kettle I was poured into the reaction kettle II, and the stirring was continued for 0.6 hours at room temperature, and the acetone was removed by vacuuming to obtain the water-based ink resin.

Example 3

(1) 35kg hydroxy-terminated polyamide-polytetrahydrofuran diol resin (hydroxyl value is 28mg (KOH)/g), 5.5kg hexamethylene diisocyanate are added in reactor 1, heated to 100 ° C, after 1.8 hours of reaction , add 2kg neopentyl glycol, 4kg of 2,4-dimethyl-1,5-pentanediol and react for 1.4 hours, reduce to room temperature and add an appropriate amount of acetone to reduce the viscosity of the reactant, add 2kg of 2-[4-( 4-Amino-cyclohexylmethyl)-cyclohexylamino]-sodium ethanesulfonate, stirred and reacted at room temperature for 1 hour, heated to 70°C, added 6kg of glycidol and reacted for 2 hours to obtain a polymer.

(2) 45.5kg of water was added to the reaction kettle II, and under stirring, the polymer in the reaction kettle I was poured into the reaction kettle II, stirring and dispersing was continued for 0.75 hours at room temperature, and the acetone was removed by vacuuming to obtain the water-based ink resin. .

Example 4

(1) 22.5kg hydroxy terminated polyamide-oxypropylene-ethylene oxide copolymerized diol resin (hydroxyl value is 42mg (KOH)/g), 10.5kg isophorone diisocyanate are added in reactor 1, heated to 85 ℃ , after the reaction for 1.2 hours, add 3kg of 1,2-cyclohexanediol and react for 1.5 hours, drop to room temperature, add an appropriate amount of acetone to reduce the viscosity of the reactant, add 1kg of N-(2-aminoethyl)-aminoethanesulfonic acid Sodium and 5kg of sodium 2,6-diaminobenzenesulfonate were stirred and reacted at room temperature for 0.6 hours, the temperature was raised to 62°C, and 3kg of epoxybutanol was added to react for 1 hour to obtain a polymer.

(2) 55kg of water was added to the reaction kettle II, and under stirring, the polymer in the reaction kettle I was poured into the reaction kettle II, and the stirring was continued at room temperature for 0.8 hours, and the acetone was removed by vacuuming to obtain the water-based ink resin.

Example 5

(1) 24kg terminal hydroxyl polyamide-tetrahydrofuran-propylene oxide copolymerized diol resin (hydroxyl value is 56mg (KOH)/g), 15kg dimethylene benzene diisocyanate are added in reactor 1, heated to 95 ℃, reaction After 1.5 hours, add 10kg of 1,3-cyclohexanediol to react for 1.2 hours, drop to room temperature, add an appropriate amount of acetone to reduce the viscosity of the reactant, add 3kg of sodium ethylenediaminoethanesulfonate, stir and react at room temperature for 0.5 hours, and heat up to At 67° C., 0.6 kg of glycidol and 0.4 kg of epoxybutanol were added to react for 1.4 hours to obtain a polymer.

(2) 47kg of water was added to the reaction kettle II, and under stirring, the polymer in the reaction kettle I was poured into the reaction kettle II, and the stirring was continued for 1 hour at room temperature, and the acetone was removed by vacuuming to obtain the water-based ink resin.

Example 6

(1) 20kg terminal hydroxyl polyamide-tetrahydrofuran-ethylene oxide copolymerized diol resin (hydroxyl value is 40mg (KOH)/g), 5kg dicyclohexylmethane diisocyanate are added in reactor 1, heated to 92 ℃, reaction 1 After 1 hour, add 4kg of 1,4-cyclohexanediol and react for 2 hours, drop to room temperature, add an appropriate amount of acetone to reduce the viscosity of the reactant, add 2kg of sodium 2,4-diaminobenzenesulfonate, stir and react at room temperature for 0.9 hours, The temperature was raised to 68° C., and 4 kg of epoxybutanol was added to react for 1.5 hours to obtain a polymer.

(2) 65kg of water was added to the reaction kettle II, and under stirring, the polymer in the reaction kettle I was poured into the reaction kettle II, stirring and dispersing was continued at room temperature for 0.9 hours, and the acetone was removed by vacuuming to obtain the water-based ink resin.

Comparative Example 1

According to the method of embodiment 2, the difference is that 27.5kg of hydroxy-terminated polyamide-polyoxypropylene glycol resin is replaced with 27.5kg of polyterephthalic acid-adipic acid-ethylene glycol-butanediol (common polyester ) to obtain water-based ink resin.

Comparative Example 2

(1) 15kg hydroxy terminated polyamide-polyoxyethylene glycol resin, 6kg hydroxy terminated polyamide-tetrahydrofuran-propylene oxide copolymerized diol resin and 13kg toluene diisocyanate are added in reactor 1, after being heated to 80 ℃ of reaction for 2 hours , add 7kg of 2,2-dimethyl-1,3-propanediol and react for 1.2 hours, reduce to room temperature, add an appropriate amount of acetone to reduce the viscosity of the reactant, add 10kg of 2-(2-amino-cyclohexylamino)-ethanesulfonic acid Sodium, stirred and reacted at room temperature for 0.6 hours to obtain a polymer.

(2) Add 45kg of water to the reaction kettle II, under stirring, pour the polymer in the reaction kettle I into the reaction kettle II, continue stirring and dispersing at room temperature for 0.5 hours, remove the acetone by vacuuming, and obtain the water-based ink resin.

Test Example 1

Prepare water-based ink, the composition and content are shown in Table 1.

Table 1

composition content (1) Water-based ink resin 50g (2) Titanium dioxide 17g (3) Dispersant BYK-180 0.3g (4) Water 20g

Preparation process: After stirring 25g water-based ink resin, 17g titanium dioxide and 0.3g dispersant BYK-180 evenly, grind it in a sand mill to a fineness of less than 15μm to obtain a color paste, and add the remaining 25g water-based paste to the color paste The ink resin and 20 g of water are mixed evenly and filtered to obtain a water-based ink.

Preparation of composite packaging substrate: The water-based ink resin of Example 1 was prepared into a water-based ink according to the above-mentioned water-based ink preparation method, and the prepared water-based ink was scraped on the surface of the PET film with a wire rod, and dried with two-component polyurethane. As a laminating adhesive, the aluminized film and the PET film are compounded, and the ink layer and the two-component polyurethane are placed in the middle of the PET film and the aluminized film to prepare a compound packaging substrate.

Boiling resistance test: The composite packaging substrate was boiled in water at 100°C for 30 minutes, and the PET film and the aluminized film did not delaminate.

Cooking resistance test: The composite packaging substrate was cooked at 2.321 bar (absolute pressure) and 125°C for 30 minutes, and the PET film and the aluminized film did not delaminate.

Test Example 2-6

The composite packaging substrate was prepared according to the method of Test Example 1 and subjected to boiling resistance and boiling resistance tests, except that the water-based ink resins of Examples 2-6 were used, and the results were similar to those of Test Example 1.

Comparative test example 1

The composite packaging substrate was prepared according to the method of Test Example 1 and subjected to boiling resistance and boiling resistance tests. The difference is that when the water-based ink resin of Comparative Example 1 was used, the PET film and the aluminized film were delaminated.

Comparative test example 2

The composite packaging substrate was prepared according to the method of Test Example 1 and subjected to boiling resistance and boiling resistance tests. The difference is that when the water-based ink resin of Comparative Example 2 was used, the PET film and the aluminized film were delaminated.

It can be seen from the results of Test Example 1-6 and Test Example Comparative Example 1-2 that the composite packaging substrate prepared with the water-based ink prepared from the water-based ink resin of the present invention has the properties of resistance to boiling and retorting, and no layer appears. separation phenomenon. And adopt common resin, do not use the comparative example 1 of the hydroxyl-terminated polyamide-ether resin of the present invention, and in step (1), do not add epoxy alcohol to carry out the comparative example 2 of capping reaction, in the test of resistance to boiling and retorting The phenomenon of interlayer peeling occurs in all of them, which cannot meet the requirements of boiling resistance and cooking resistance. That is to say, in the present invention, the main structure of the prepared water-based ink resin has good hydrolysis resistance by selecting hydroxyl-terminated polyamide-ether resin as the soft segment and diol as the chain extender; diamine sulfonate is used as the extender. The chain agent effectively reduces the content of hydrophilic components in the water-based ink resin and improves the water resistance of the water-based ink resin. The structure of the terminal epoxy group of epoxy alcohol is introduced to improve the adhesion fastness of the ink resin. The above structural features make the water-based ink prepared from the water-based ink resin have the advantages of water-boil resistance and retort resistance after being printed on the packaging substrate.

The preferred embodiments of the present invention have been described above in detail, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, a variety of simple modifications can be made to the technical solutions of the present invention, including the combination of various technical features in any other suitable manner. These simple modifications and combinations should also be regarded as the content disclosed in the present invention. All belong to the protection scope of the present invention.

Claims (10)

1. The water-based ink composition is characterized by comprising the following components in percentage by weight:

(1) 20-35 wt% of a hydroxyl-terminated polyamide-ether resin;

(2) 5-15 wt% of diisocyanate;

(3) 2-10 wt% of a glycol;

(4) 2-10 wt% of diamine sulfonate;

(5) 1-6 wt% of epoxy alcohol;

(6) 45-65 wt% of water;

the dihydric alcohol is at least one of 2, 2-dimethyl-1, 3-propanediol, 2-ethyl-2-butyl-1, 3-propanediol, neopentyl glycol, 1, 2-cyclohexanediol, 1, 3-cyclohexanediol, 1, 4-cyclohexanediol, hydrogenated bisphenol A, 2-isopropyl-1, 4-butanediol, 3-methyl-1, 5-pentanediol and 2, 4-dimethyl-1, 5-pentanediol.

2. The aqueous ink composition according to claim 1, wherein the hydroxyl-terminated polyamide-ether resin has a hydroxyl value of 28 to 56mg KOH/g.

3. The aqueous ink composition according to claim 1 or 2, wherein the hydroxyl-terminated polyamide-ether resin is at least one of a hydroxyl-terminated polyamide-polyoxyethylene glycol resin, a hydroxyl-terminated polyamide-polyoxypropylene glycol resin, a hydroxyl-terminated polyamide-polytetrahydrofuran glycol resin, a hydroxyl-terminated polyamide-oxypropylene-oxyethylene copolyol resin, a hydroxyl-terminated polyamide-tetrahydrofuran-oxypropylene copolyol resin, a hydroxyl-terminated polyamide-tetrahydrofuran-oxyethylene copolyol resin.

4. The aqueous ink composition according to claim 1, wherein the diisocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, and dicyclohexylmethane diisocyanate.

5. The aqueous ink composition according to claim 1, wherein the diamine sulfonate is at least one of 2- (2-amino-cyclohexylamino) -ethanesulfonic acid sodium salt, 2- [ (5-amino-1, 3, 3-trimethyl-cyclohexylmethyl) -amino ] -ethanesulfonic acid sodium salt, 2- [4- (4-amino-cyclohexylmethyl) -cyclohexylamino ] -ethanesulfonic acid sodium salt, N- (2-aminoethyl) -aminoethanesulfonic acid sodium salt, ethylenediamine ethanesulfonic acid sodium salt, 2, 4-diaminobenzenesulfonic acid sodium salt, and 2, 6-diaminobenzenesulfonic acid sodium salt.

6. The aqueous ink composition according to claim 1, wherein the epoxy alcohol is propylene oxide and/or butylene oxide.

7. A method for preparing an aqueous ink resin from the aqueous ink composition according to any one of claims 1 to 6, wherein the method comprises the steps of:

(1) carrying out a first reaction on hydroxyl-terminated polyamide-ether resin and diisocyanate, adding dihydric alcohol for a second reaction, cooling to room temperature, adding acetone, then adding diamine sulfonate for a third reaction, and adding epoxy alcohol for a fourth reaction to obtain a polymer;

(2) and (3) contacting the polymer with water to disperse, and removing acetone to obtain the water-based ink resin.

8. The method of claim 7, wherein the conditions of the first reaction comprise: the temperature is 80-100 ℃, and the time is 1-2 h;

the conditions of the second reaction include: the temperature is 80-100 ℃, and the time is 1-2 h;

the conditions of the third reaction include: the temperature is room temperature, and the time is 0.5-1 h;

the conditions of the fourth reaction include: the temperature is 60-70 ℃, and the time is 1-2 h;

the dispersing conditions include: the temperature is room temperature, and the time is 0.5-1 h.

9. An aqueous ink resin prepared by the method of any one of claims 7 to 8.

10. Use of the aqueous ink resin of claim 9 in an ink.