Waterborne acrylic resin as well as preparation method and application thereof

Abstract

The embodiment of the invention discloses waterborne acrylic resin as well as a preparation method and application thereof. The water-based acrylic resin is prepared from the following raw materials in parts by weight: 1 to 1.5 parts of sodium dodecyl benzene sulfonate, 2 to 2.5 parts of an AEO-9 surfactant, 25 to 27 parts of butyl acrylate, 4 to 5 parts of glycidyl methacrylate, 70 to 73 parts of 2-ethylhexyl acrylate, 6 to 7 parts of methacrylic acid, 10 to 12 parts of acrylonitrile, 3 to 3.5 parts of acrylamide, 0.9 to 1 part of ammonium persulfate and 142 to 145 parts of deionized water. The water-based acrylic resin disclosed by the invention is stable in performance and beneficial to prolonging the storage time, and meanwhile, when the water-based acrylic resin is applied to production of the water-decrement microfiber synthetic leather, the product can meet the production requirements of a water-decrement microfiber synthetic leather dry process in the aspects of hygroscopicity, thickness, softness, rebound resilience and the like. The raw materials of the water-based acrylic resin are environment-friendly, harmful substances such as formaldehyde are not generated, meanwhile, the production cost is low, the water-based acrylic resin is environment-friendly, and the water-based acrylic resin has a wide application prospect.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of waterborne resins, and specifically to a waterborne acrylic resin, a preparation method thereof and an application thereof. Background Art

[0002] Microfiber synthetic leather is a product similar to genuine leather formed by impregnating microfiber non-woven fabric with resin, curing (there are two methods: drying into film and wet coagulation), reducing weight, and then undergoing various other process finishing. Traditional microfiber synthetic leather is either produced using a toluene weight reduction process or a sodium hydroxide alkali weight reduction process, with a large amount of organic solvents or waste alkali discharged during the production process, which has adverse effects on the human body and the environment. Even in the production process using waterborne microfiber resin, sodium hydroxide is still used for alkali weight reduction in the final weight reduction process, generating a large amount of alkali-containing wastewater. While water weight reduction microfiber will no longer use sodium hydroxide and can directly complete the weight reduction process with water, which is not only convenient to use, but also has no waste alkali discharge, simpler sewage treatment, and lower treatment cost. It is a new type of green and environmentally friendly product in the field of microfiber synthetic leather.

[0003] Chinese Patent CN 109134819A discloses a preparation method of a waterborne resin for impregnating island-in-sea microfiber synthetic leather, wherein the waterborne resin is an amphoteric waterborne polyurethane resin simultaneously having anionic and cationic groups, and this waterborne resin can withstand alkali weight reduction and can be used for the manufacture of island-in-sea microfiber synthetic leather.

[0004] Chinese Patent CN 110685159A discloses a production method of waterborne microfiber synthetic leather, which uses a blend of a waterborne polyurethane emulsion and an acrylic acid and its ester copolymer emulsion as a waterborne impregnating slurry. In an alkali weight reduction environment, by using the hydrolysis effect of sodium hydroxide on the acrylic acid and its ester copolymer, both the acrylic acid and its ester copolymer in the resin and the sea component in the sea-island fiber are simultaneously reduced to obtain a substrate with pores.

[0005] Chinese Patent CN 114671973A discloses a preparation and application method of a waterborne acrylic resin, which uses an acrylate copolymer emulsion as a waterborne impregnating material and produces an island-in-sea microfiber synthetic leather by a waterborne dry alkali weight reduction process.

[0006] Chinese Patent CN 117402282A discloses a preparation and application method of a waterborne acrylic resin, which uses an acrylate copolymer emulsion as a waterborne impregnating material and produces an island-in-sea microfiber synthetic leather by a waterborne wet alkali weight reduction process.

[0007] The water reduction of ultra-fine synthetic leather is a new environmental protection production technology. Compared with the existing alkaline reduction process of waterborne ultra-fine synthetic leather, sodium hydroxide does not need to be added during the reduction process, and only water is required, which can greatly reduce the emission of alkaline pollutants. At present, there is no report on the waterborne acrylic resin applicable to the dry process water reduction process of ultra-fine synthetic leather. Summary of the Invention

[0008] Therefore, an embodiment of the present invention provides a waterborne acrylic resin, a preparation method thereof, and an application thereof.

[0009] In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

[0010] According to the first aspect of the embodiment of the present invention, the present invention provides a waterborne acrylic resin, comprising the following raw materials in parts by weight: 1-1.5 parts of sodium dodecylbenzenesulfonate, 2-2.5 parts of AEO-9 surfactant, 25-27 parts of butyl acrylate, 4-5 parts of glycidyl methacrylate, 70-73 parts of isooctyl acrylate, 6-7 parts of methacrylic acid, 10-12 parts of acrylonitrile, 3-3.5 parts of acrylamide, 0.9-1 part of ammonium persulfate, and 142-145 parts of deionized water.

[0011] The waterborne acrylic resin of the present invention uses isooctyl acrylate, butyl acrylate, methacrylic acid, acrylonitrile, and acrylamide as copolymerization monomers, glycidyl methacrylate as a cross-linking monomer, sodium dodecylbenzenesulfonate and AEO-9 surfactant as emulsifiers, ammonium persulfate as an initiator, and deionized water as a solvent, and is prepared by an emulsion polymerization method.

[0012] Among them: The isooctyl acrylate selected in the present invention can reduce the glass transition temperature of the resin and improve the softness of the resin film after filming compared with butyl acrylate and ethyl acrylate; the butyl acrylate selected in the present invention can improve the hydrolysis resistance of the resin compared with methyl acrylate and ethyl acrylate, and can improve the softness of the resin film after filming compared with butyl methacrylate; the methacrylic acid selected in the present invention can make the resin have higher wear resistance compared with acrylic acid; the acrylamide selected in the present invention does not contain free formaldehyde compared with N-methylol acrylamide, is more environmentally friendly, and can also improve the storage stability of the resin; the glycidyl methacrylate selected in the present invention has a higher crosslinking density compared with the commonly used crosslinking agent AAEM for acrylic resins, which is more conducive to improving the bonding fastness of the polymer; the acrylonitrile selected in the present invention has higher wear resistance compared with styrene; the present invention selects a composite emulsification system of an anionic emulsifier sodium dodecylbenzenesulfonate and a non-ionic emulsifier AEO-9 surfactant. Compared with a single anionic or non-ionic emulsification system, the polymerization reaction is more stable, easier to control, and has higher storage stability. Sodium dodecylbenzenesulfonate has better acid and alkali resistance, hydrolysis resistance, and is more resistant to hard water compared with sodium dodecyl sulfate. Through a large amount of research on the raw materials and ratios of the waterborne acrylic resin, the present invention enables the raw materials to play a synergistic effect. The obtained waterborne acrylic resin has stable performance, which is beneficial to extending the storage time. At the same time, when it is applied to the production of water-reduced microfiber synthetic leather, the product can meet the production requirements of the dry process of water-reduced microfiber synthetic leather in terms of moisture absorption, bulk thickness, softness, resilience, etc. In particular, the two monomers, methacrylic acid and acrylonitrile, cannot be used arbitrarily in the alkali reduction process of waterborne islanded microfiber due to their poor alkali resistance, but their alkali resistance does not need to be considered in the production of water-reduced microfiber. The addition of these two monomers can well improve the comprehensive performance index of the resin.

[0013] Furthermore, it includes the following raw materials in parts by weight: 1.3 parts of sodium dodecylbenzenesulfonate, 2.2 parts of AEO-9 surfactant, 26 parts of butyl acrylate, 4.5 parts of glycidyl methacrylate, 71.3 parts of isooctyl acrylate, 6.7 parts of methacrylic acid, 11 parts of acrylonitrile, 3.3 parts of acrylamide, 0.9 part of ammonium persulfate, and 144 parts of deionized water.

[0014] Furthermore, the performance indicators of the waterborne acrylic resin are as follows: Appearance: white slightly blue emulsion; Ionicity: anionic; pH value: 3 - 4; Viscosity: 500 - 600 mPa·S; Particle size range: 60 - 90 nm; Average particle size: 65 - 80 nm; Average molecular weight: > 250,000; Solids content %: 45 ± 1.

[0015] According to the second aspect of the embodiments of the present invention, the present invention provides a preparation method of the waterborne acrylic resin as described in any one of the above, including:

[0016] Dissolve ammonium persulfate in part of deionized water to obtain an ammonium persulfate aqueous solution;

[0017] Pre-emulsify isooctyl acrylate, butyl acrylate, methacrylic acid, acrylonitrile, acrylamide, glycidyl methacrylate, sodium dodecylbenzenesulfonate, AEO-9 surfactant and the remaining deionized water to obtain a pre-emulsion;

[0018] Heat the ammonium persulfate aqueous solution to 78 - 82 °C, and dropwise add the pre-emulsion thereto. After the dropping is completed, carry out aging, cooling, and adjust the solid content to obtain the aqueous acrylic resin.

[0019] Further, the amount of the part of deionized water used is 9 - 11% of the mass of deionized water.

[0020] Further, the dropping time is 3 - 3.5 hours, and the dropping temperature is controlled to be maintained at 78 - 82 °C.

[0021] Further, the aging temperature is 88 - 92 °C, and the time is 40 minutes.

[0022] In some specific embodiments, the method for preparing the aqueous acrylic resin provided by the present invention includes the following steps:

[0023] 1) Add ammonium persulfate and 9 - 11% of deionized water to a reaction kettle and stir evenly;

[0024] 2) Add butyl acrylate, glycidyl methacrylate, isooctyl acrylate, methacrylic acid, acrylonitrile, and acrylamide to a mixing kettle and stir well. Then add 27 - 32% of deionized water, 6 - 20% of sodium dodecylbenzenesulfonate, and 16 - 25% of AEO-9 surfactant, and stir well to dissolve;

[0025] 3) Add the remaining deionized water, sodium dodecylbenzenesulfonate and AEO-9 surfactant to a pre-emulsification kettle, stir well to dissolve, and then add the material in the mixing kettle to the pre-emulsification kettle and stir well to emulsify to obtain a pre-emulsion;

[0026] 4) Heat the reaction kettle to 78 - 82 °C, start to dropwise add the pre-emulsion, and keep dropping at 78 - 82 °C for 3 - 3.5 hours;

[0027] 5) After the dropping is completed, heat the reaction kettle to 88 - 92 °C, age for 40 minutes, cool to below 40 °C, detect the solid content, and adjust the solid content of the emulsion to 45 ± 1% with deionized water to obtain the aqueous acrylic resin.

[0028] According to the third aspect of the embodiments of the present invention, the present invention provides the application of the aqueous acrylic resin as described above in the process of water-reduced microfiber synthetic leather.

[0029] Further, the process of water-reduced microfiber synthetic leather is a dry process.

[0030] The embodiments of the present invention have the following advantages:

[0031] 1. The aqueous acrylic resin of the present invention has stable performance, which is beneficial to extending the storage time. At the same time, when it is applied to the production of water-reduced microfiber synthetic leather, the product can meet the production requirements of the dry process of water-reduced microfiber synthetic leather in terms of moisture absorption, fluffiness, softness, resilience, etc.

[0032] 2. The raw materials of the aqueous acrylic resin of the present invention are environmentally friendly, do not produce harmful substances such as formaldehyde, and at the same time have low production costs, are friendly to the environment, and have broad application prospects. Specific Embodiments

[0033] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0034] Example 1

[0035] This example provides an aqueous acrylic resin with the following raw material proportions: 1.1 grams of sodium dodecylbenzenesulfonate, 2.2 grams of AEO-9 surfactant, 25.5 grams of butyl acrylate, 4.5 grams of glycidyl methacrylate, 72.5 grams of isooctyl acrylate, 6.2 grams of methacrylic acid, 11.4 grams of acrylonitrile, 3.3 grams of acrylamide, 0.9 grams of ammonium persulfate, and 144 grams of deionized water.

[0036] The preparation method of the aqueous acrylic resin provided in this example includes the following steps:

[0037] 1) Add 0.9 grams of ammonium persulfate and 15 grams of deionized water to the reaction kettle and stir evenly;

[0038] 2) Add all the monomers, namely 25.5 grams of butyl acrylate, 4.5 grams of glycidyl methacrylate, 72.5 grams of isooctyl acrylate, 6.2 grams of methacrylic acid, 11.4 grams of acrylonitrile, and 3.3 grams of acrylamide, to the mixing kettle and stir well to mix;

[0039] 3) Add 44 g of deionized water, 0.1 g of sodium dodecylbenzenesulfonate, and 0.45 g of AEO-9 surfactant to the mixing kettle, and stir well to dissolve.

[0040] 4) Add the remaining 85 g of deionized water, 1 g of sodium dodecylbenzenesulfonate, and 1.75 g of AEO-9 surfactant to the pre-emulsification kettle, and stir well to dissolve.

[0041] 5) Add the materials in the mixing kettle to the pre-emulsification kettle, and stir well to emulsify to form a pre-emulsion.

[0042] 6) Heat the reaction kettle to 78 °C, then start to drip the pre-emulsion, control the uniform dripping of the materials, and finish dripping in 3 hours and 15 minutes. The reaction temperature is always controlled at 78 - 82 °C.

[0043] 7) After adding the pre-emulsion, heat the reaction kettle to 88 - 92 °C, cure for 40 minutes, then cool down to below 40 °C, detect the solid content, and adjust the solid content of the emulsion to 45 ± 1% with deionized water to obtain the product.

[0044] Example 2

[0045] This example provides an aqueous acrylic resin, and the raw material ratio is as follows: 1.4 g of sodium dodecylbenzenesulfonate, 2.3 g of AEO-9 surfactant, 26.8 g of butyl acrylate, 4.7 g of glycidyl methacrylate, 71.2 g of isooctyl acrylate, 6.6 g of methacrylic acid, 10.5 g of acrylonitrile, 3.1 g of acrylamide, 1 g of ammonium persulfate, and 142 g of deionized water.

[0046] The preparation method of the aqueous acrylic resin provided in this example includes the following steps:

[0047] 1) Add 1 g of ammonium persulfate and 15 g of deionized water to the reaction kettle and stir evenly.

[0048] 2) Add all the monomers, namely 26.8 g of butyl acrylate, 4.7 g of glycidyl methacrylate, 71.2 g of isooctyl acrylate, 6.6 g of methacrylic acid, 10.5 g of acrylonitrile, and 3.1 g of acrylamide, to the mixing kettle and stir well to mix.

[0049] 3) Add 43 g of deionized water, 0.2 g of sodium dodecylbenzenesulfonate, and 0.4 g of AEO-9 surfactant to the mixing kettle, and stir well to dissolve.

[0050] 4) Add the remaining 84 g of deionized water, 1.2 g of sodium dodecylbenzenesulfonate, and 1.9 g of AEO-9 surfactant to the pre-emulsification kettle, and stir well to dissolve.

[0051] 5) Add the materials in the mixing kettle to the pre-emulsification kettle, and stir well to emulsify to form a pre-emulsion.

[0052] 6) The reaction kettle is heated to 80 °C, and then the pre-emulsion is added dropwise. Control the uniform dropping of the materials and finish the dropping in 3 hours and 10 minutes. The reaction temperature is always controlled at 78 - 82 °C;

[0053] 7) After the pre-emulsion is added completely, the reaction kettle is heated to 88 - 92 °C. After aging for 40 minutes, it is cooled down to 40 °C. The solid content is detected, and the solid content of the emulsion is adjusted to 45 ± 1% with deionized water to obtain the product.

[0054] Example 3

[0055] This example provides an aqueous acrylic resin with the following raw material proportions: 1.1 grams of sodium dodecylbenzenesulfonate, 2.5 grams of AEO-9 surfactant, 26 grams of butyl acrylate, 4.7 grams of glycidyl methacrylate, 71.9 grams of isooctyl acrylate, 6.1 grams of methacrylic acid, 11.8 grams of acrylonitrile, 3.4 grams of acrylamide, 0.95 grams of ammonium persulfate, and 145 grams of deionized water.

[0056] The preparation method of the aqueous acrylic resin provided in this example includes the following steps:

[0057] 1) Add 0.95 grams of ammonium persulfate and 15 grams of deionized water to the reaction kettle and stir evenly;

[0058] 2) Add all the monomers, namely 26 grams of butyl acrylate, 4.7 grams of glycidyl methacrylate, 71.9 grams of isooctyl acrylate, 6.1 grams of methacrylic acid, 11.8 grams of acrylonitrile, and 3.4 grams of acrylamide, to the mixing kettle and stir well to mix;

[0059] 3) Add 45 grams of deionized water, 0.15 grams of sodium dodecylbenzenesulfonate, and 0.47 grams of AEO-9 surfactant to the mixing kettle and stir well to dissolve;

[0060] 4) Add the remaining 85 grams of deionized water, 0.95 grams of sodium dodecylbenzenesulfonate, and 2.03 grams of AEO-9 surfactant to the pre-emulsifying kettle and stir well to dissolve;

[0061] 5) Add the materials in the mixing kettle to the pre-emulsifying kettle and stir well to emulsify to form a pre-emulsion;

[0062] 6) The reaction kettle is heated to 81 °C, and then the pre-emulsion is added dropwise. Control the uniform dropping of the materials and finish the dropping in 3 hours and 25 minutes. The reaction temperature is always controlled at 78 - 82 °C;

[0063] 7) After the pre-emulsion is added completely, the reaction kettle is heated to 88 - 92 °C. After aging for 40 minutes, it is cooled down to below 40 °C. The solid content is detected, and the solid content of the emulsion is adjusted to 45 ± 1% with deionized water to obtain the product.

[0064] Comparative Example 1

[0065] This comparative example provides an aqueous acrylic resin with the following raw material proportions: 1.8 grams of sodium dodecylbenzenesulfonate, 2.8 grams of AEO-9 surfactant, 24 grams of butyl acrylate, 4.5 grams of glycidyl methacrylate, 73 grams of isooctyl acrylate, 5.7 grams of methacrylic acid, 12.2 grams of acrylonitrile, 2.6 grams of acrylamide, 1.1 grams of ammonium persulfate, and 140 grams of deionized water.

[0066] The preparation method of the aqueous acrylic resin provided in this comparative example includes the following steps:

[0067] 1) Add 1.1 grams of ammonium persulfate and 15 grams of deionized water to the reaction kettle and stir evenly.

[0068] 2) Add all the monomers, namely 24 grams of butyl acrylate, 4.5 grams of glycidyl methacrylate, 73 grams of isooctyl acrylate, 5.7 grams of methacrylic acid, 12.2 grams of acrylonitrile, and 2.6 grams of acrylamide, to the mixing kettle and stir well to mix.

[0069] 3) Add 42 grams of deionized water, 0.18 grams of sodium dodecylbenzenesulfonate, and 0.6 grams of AEO-9 surfactant to the mixing kettle and stir well to dissolve.

[0070] 4) Add the remaining 83 grams of deionized water, 1.62 grams of sodium dodecylbenzenesulfonate, and 2.2 grams of AEO-9 surfactant to the pre-emulsification kettle and stir well to dissolve.

[0071] 5) Add the materials in the mixing kettle to the pre-emulsification kettle and stir well to emulsify to form a pre-emulsion.

[0072] 6) Heat the reaction kettle to 82 °C, then start to drip the pre-emulsion, control the uniform dripping of the materials, and finish dripping in 3 hours and 22 minutes. The reaction temperature is always controlled at 78 - 82 °C.

[0073] 7) After the pre-emulsion is added, heat the reaction kettle to 88 - 92 °C, cure for 40 minutes, then cool down to below 40 °C, detect the solid content, and adjust the solid content of the emulsion to 45 ± 1% with deionized water to obtain the product.

[0074] Test Example 1

[0075] Test the emulsion properties of the aqueous acrylic resin products prepared in Examples 1 - 3 and Comparative Example 1, and the results are shown in Table 1.

[0076] Table 1

[0077]

[0078] The results show that: The aqueous acrylic resin of the embodiment of the present invention is significantly different from Comparative Example 1 in terms of viscosity, particle size range, average particle size and average molecular weight. At the same time, the aqueous acrylic resin of the embodiment of the present invention has stable performance and more excellent storage stability.

[0079] Test Example 2

[0080] Take a water-reduced microfiber non-woven fabric with a weight of 350 g / m², an average thickness of 30 filaments, and an island-to-sea ratio of 30:70, and directly impregnate it with the aqueous acrylic resin products of Examples 1-3 and Comparative Example 1. The liquid uptake rate is 190-210% of the dry weight of the fixed-island microfiber non-woven fabric. After drying at 140-150 °C, reduce the weight in water at 95-98 °C for 50 minutes, and then dry and tan.

[0081] The dry weight of the water-reduced microfiber non-woven fabric is W, and the total weight after impregnation with the resin is X. The liquid uptake rate = (X - W) ÷ W.

[0082] The fluff thickness is the ratio of the thickness of the water-reduced microfiber non-woven fabric after impregnation, drying, weight reduction, water washing and then drying to the thickness before impregnation.

[0083] The dry weight of the water-reduced microfiber non-woven fabric is W, the total weight after impregnation with the resin is X, and the weight of the water-reduced microfiber after impregnation, drying, weight reduction, water washing and then drying is Y. The resin retention rate = (Y - W × 0.7) ÷ (X - W).

[0084] The resilience and handfeel are tested by directly touching with hands.

[0085] The specific application results are shown in Table 2.

[0086] Table 2

[0087] Resin Resin retention rate (%) Fluff thickness (%) Resilience Hand feeling Liquid carrying rate (%) Example 1 98.3 90 Good Especially soft 202 Example 2 98.5 91 Good Especially soft 205 Example 3 98.2 90 Good Especially soft 199 Comparative example 1 96.3 84 Good Especially soft 204

[0088] The results show that: After reducing the weight in water at 95-98 °C for 50 minutes and washing with water, the resin retention rate of Examples 1-3 reaches more than 98%. It shows that the aqueous acrylic resin of the present invention has good resin retention rate in the dry process of water-reduced microfiber synthetic leather, and at the same time, the prepared microfiber synthetic leather products have a fluffy, thick, soft and resilient handfeel, greatly meeting the use requirements.

[0089] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A water-based acrylic resin, characterized in that The invention comprises the following raw materials in parts by weight: 1-1.5 parts of sodium dodecylbenzene sulfonate, 2-2.5 parts of AEO-9 surfactant, 25-27 parts of butyl acrylate, 4-5 parts of glycidyl methacrylate, 70-73 parts of isooctyl acrylate, 6-7 parts of methacrylic acid, 10-12 parts of acrylonitrile, 3-3.5 parts of acrylamide, 0.9-1 part of ammonium persulfate and 142-145 parts of deionized water.

2. The water-based acrylic resin according to claim 1, characterized in that The invention comprises the following raw materials in parts by weight: 1.3 parts of sodium dodecylbenzene sulfonate, 2.2 parts of AEO-9 surfactant, 26 parts of butyl acrylate, 4.5 parts of glycidyl methacrylate, 71.3 parts of isooctyl acrylate, 6.7 parts of methacrylic acid, 11 parts of acrylonitrile, 3.3 parts of acrylamide, 0.9 parts of ammonium persulfate and 144 parts of deionized water.

3. The water-based acrylic resin according to claim 1, characterized in that The performance indicators of the water-based acrylic resin are as follows: Appearance: white slightly blue emulsion; Ionicity: Anionic; pH: 3-4; Viscosity: 500-600mPa.S; Particle size range: 60-90nm; Average particle size: 65-80nm; Average molecular weight: >250,000; Solid content: 45±1%.

4. The method for preparing the water-based acrylic resin according to any one of claims 1 to 3, characterized in that: include: Dissolving ammonium persulfate in part of deionized water to obtain an ammonium persulfate aqueous solution; Pre-emulsify isooctyl acrylate, butyl acrylate, methacrylic acid, acrylonitrile, acrylamide, glycidyl methacrylate, sodium dodecylbenzenesulfonate, AEO-9 surfactant, and the balance deionized water to obtain a pre-emulsified liquid; The ammonium persulfate aqueous solution is heated to 78-82° C., and the pre-emulsion is added dropwise thereto. After the addition is completed, the solution is aged, cooled, and the solid content is adjusted to obtain the water-based acrylic resin.

5. The method for preparing the water-based acrylic resin according to claim 4, characterized in that: The amount of the partial deionized water is 9-11% of the mass of the deionized water.

6. The method for preparing the water-based acrylic resin according to claim 4, characterized in that: The dropping time is 3-3.5 hours, and the dropping temperature is controlled to be maintained at 78-82°C.

7. The method for preparing the water-based acrylic resin according to claim 4, characterized in that: The aging temperature is 88-92° C. and the aging time is 40 minutes.

8. The method for preparing the water-based acrylic resin according to claim 4, characterized in that: The steps include: 1) Add ammonium persulfate and 9-11% deionized water into a reaction kettle and stir evenly; 2) Add butyl acrylate, glycidyl methacrylate, isooctyl acrylate, methacrylic acid, acrylonitrile and acrylamide into a mixing kettle and stir well to mix, then add 27-32% of deionized water, 6-20% of sodium dodecylbenzene sulfonate and 16-25% of AEO-9 surfactant and stir well to dissolve; 3) adding the remaining deionized water, sodium dodecylbenzene sulfonate and AEO-9 surfactant into the pre-emulsification kettle, stirring and dissolving them fully, then adding the materials in the mixing kettle into the pre-emulsification kettle, stirring and emulsifying them fully, and obtaining a pre-emulsified liquid; 4) raising the temperature of the reactor to 78-82° C., starting to dropwise add the pre-emulsion, and maintaining the temperature at 78-82° C. for 3-3.5 hours; 5) After the dropwise addition is completed, the reactor is heated to 88-92° C., aged for 40 minutes, cooled to below 40° C., the solid content is detected, and the solid content of the emulsion is adjusted to 45±1% with deionized water to obtain the water-based acrylic resin.

9. Use of the water-based acrylic resin according to claim 1 in a water-reduced microfiber synthetic leather process.

10. The use according to claim 9, characterized in that: The water-reduced ultra-fiber synthetic leather process is a dry process.

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