Water-based blister varnish and preparation method thereof

Abstract

The invention relates to the technical field of blister oil, in particular to water-based blister oil and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing raw materials; (2) synthesizing hydroxyl polyacrylate; (3) synthesizing polyurethane: adding not less than 1 / 2 of diisocyanate, polyester glycol and part of the first catalyst into the reaction kettle, heating, keeping the reaction, then adding the rest diisocyanate, hyperbranched polyol and part of the first catalyst, continuing the heat-preservation reaction, then cooling, and then adding the hyperbranched polyol and part of the first catalyst into the reaction kettle; and then adding an acetone mixed solution consisting of a hydroxyl polyacrylate mixed solution, a chain extender, the rest of the first catalyst and not more than 2 / 3 of acetone, carrying out heat preservation reaction, diluting, adding deionized water, and removing acetone to obtain the water-based blister varnish. According to the method, crosslinking is enhanced through hyperbranched polyol, the performance is optimized through an IPN structure, controllability is improved through staged reaction, and unification of high performance and environmental protection of the blister varnish is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of blister oil, in particular to a water-based blister oil and a preparation method thereof. Background Art

[0002] Traditional blister oil technology is mainly divided into two categories: oil-based system and water-based system, but both have significant defects and are difficult to meet the comprehensive needs of the modern packaging industry for environmental protection, performance and process efficiency.

[0003] Oil-based blister packaging uses organic solvents such as toluene and ethyl acetate as diluents. The drying process produces high levels of volatile organic compounds (VOCs), which not only pollute the environment but also pose health risks to operators with long-term exposure. For example, traditional oil-based products dry slowly (taking several hours), and residual solvents can cause odor or toxicity transfer to packaged food.

[0004] Although early water-based products were environmentally friendly (low VOCs), they had the following problems: (1) Poor plastic absorption ability. The bonding strength to substrates such as PVC and PET was insufficient (peel strength was only 0.15N / cm), and they were prone to back-adhesion or debonding at high temperatures. (2) Dependence on film-forming agents. To compensate for the film-forming defects of water-based resins, 20%-50% of film-forming agents (such as glycol ethers) had to be added. However, there were still problems such as slow drying and difficult wastewater treatment.

[0005] Some technologies attempt to improve performance through acrylic-polyurethane compounding, but there are compatibility issues, such as insufficient heat resistance of polyurethane (anti-stickiness at 65°C) and poor flexibility of acrylic resin. Alternatively, wax emulsions (such as polyethylene wax) are added to improve wear resistance, or nano-silica is introduced to enhance heat resistance, but the cost is high and the dispersion stability is poor. Summary of the Invention

[0006] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide a high-performance aqueous vacuum blister oil that is not prone to anti-sticking at high temperatures and a preparation method thereof.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A method for preparing a water-based blister oil comprises the following steps:

[0009] (1) preparing raw materials: 70-90 parts by weight of diisocyanate, 30-40 parts by weight of polyester diol, 20-30 parts by weight of hyperbranched polyol, 0.1-0.2 parts by weight of a first catalyst, 4-5 parts by weight of a chain extender, 5-10 parts by weight of acrylic acid, 3-6 parts by weight of 2-hydroxyethyl acrylate, 2-4 parts by weight of methyl methacrylate, 0.02-0.04 parts by weight of an initiator, 0.1-0.2 parts by weight of an emulsifier, 50-70 parts by weight of acetone, and 80-120 parts by weight of deionized water;

[0010] (2) Synthesis of polyacrylate: acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate and emulsifier are added to 1 / 3-1 / 2 of deionized water, stirred evenly, and then an initiator is added. The temperature is raised to 80-90°C and the reaction is carried out for 1.5-2.5 hours to obtain a hydroxy polyacrylate mixture.

[0011] (3) Synthesis of polyurethane: Add not less than 1 / 2 of diisocyanate, polyester diol and part of the first catalyst to the reactor, heat to 70-90°C, keep reacting for 3-4h, then add the remaining diisocyanate, hyperbranched polyol and part of the first catalyst, continue to keep warm and react for 3-4h, then cool to 50-60°C, then add hydroxy polyacrylate mixture, chain extender, the remaining first catalyst and acetone mixture consisting of no more than 2 / 3 of acetone, keep warm and react for 2-3h, add the remaining acetone to dilute, then add the remaining deionized water for emulsification, and after recovering the acetone, obtain water-based blister oil.

[0012] Wherein, the diisocyanate is one or a combination of isophorone diisocyanate and hexamethylene diisocyanate. Preferably, the diisocyanate is isophorone diisocyanate.

[0013] Wherein, the polyester polyol is one or more of polyhexamethylene adipate diol, polybutylene adipate diol and polyneopentyl adipate diol. Preferably, the polyester polyol is polyhexamethylene adipate diol.

[0014] Wherein, the first catalyst is dibutyltin dilaurate.

[0015] The chain extender is one or more of 2,2-dimethylol propionic acid and 1,4-butanediol-2-sodium sulfonate. Preferably, the chain extender is a mixture of 2,2-dimethylol propionic acid and 1,4-butanediol-2-sodium sulfonate in a ratio of 1:1-2.

[0016] Wherein, the initiator is one or more of ammonium persulfate and potassium persulfate. Preferably, the initiator is a mixture of ammonium persulfate and potassium persulfate in a weight ratio of 1:1.

[0017] The emulsifier is a combination of sorbitan stearate and polyoxyethylene sorbitan monostearate. Preferably, the emulsifier is a mixture of sorbitan stearate and polyoxyethylene sorbitan monostearate in a weight ratio of 1:1.

[0018] The preparation method of the hyperbranched polyol comprises the following steps: adding diol, pentaerythritol and dihydroxymethyl acid in a mass ratio of 1:1-2:7-17 into a reaction device, fully stirring and mixing, heating to 120-140° C., adding a second catalyst of 0.4-1 wt % of the diol, continuing the reaction for 2-3 hours, vacuuming and reacting for 2-3 hours, terminating the reaction when the acid value is stable, cooling to below 50° C., dissolving the product with acetone, pouring it into n-hexane for precipitation, and finally vacuum drying to obtain the hyperbranched polyol.

[0019] Hyperbranched polyol of the present invention forms a three-dimensional branched structure containing multiple hydroxyls in the terminal through the coordinated reaction of dibasic alcohol, pentaerythritol and dihydroxymethyl acid. Compared with linear polyol (functionality 2-3), it can form a higher density cross-linked network when reacting with isocyanate, significantly improving the tensile strength and elongation at break of blister oil. The carboxyl (COOH) of dihydroxymethyl acid gives the hyperbranched polyol self-emulsifying ability, making the blister oil form more stable microemulsion in water, which is better than traditional external emulsification product. The void structure of the hyperbranched polyol can load nano silicon dioxide, reduce molecular chain entanglement, reduce high temperature fluidity, and improve the temperature resistance of blister oil.

[0020] Wherein, the diol is one or more of propylene glycol and 1,4-butanediol. Preferably, the diol is propylene glycol.

[0021] The beneficial effects of the present invention are as follows: the present invention first reacts with polyester diol to generate a soft segment prepolymer, and then reacts with hyperbranched polyol to construct a hard segment structure for the second time. This design can accurately control the distribution of molecular segments and optimize mechanical properties. Through the three-dimensional structure and a large number of terminal hydroxyl groups of the hyperbranched polyol, the crosslinking density and molecular chain flexibility of the polyurethane are significantly improved, and the heat resistance and adhesion can be significantly enhanced. After the polyurethane prepolymer is synthesized in steps, it is reacted with a hydroxy polyacrylate mixture (containing 2-hydroxyethyl acrylate) to form an interpenetrating network structure (IPN). This structure combines the flexibility of polyurethane and the high gloss of polyacrylate, solves the defect of "hot sticky and cold brittle" of traditional water-based blister oil, and enhances the bonding strength to various substrates such as PVC, PET, and paper cards, and dries quickly. The synergistic effect of hyperbranched polyol and methyl methacrylate makes the blister oil heat-resistant to a temperature of more than 80°C (traditional products are only 65°C), and there is no risk of degumming in high temperature and high humidity environments. The product system is fully aqueous (VOC <50g / L), free of harmful substances such as formaldehyde, and certified by EU REACH and FDA, making it suitable for food and pharmaceutical packaging. This method achieves both high performance and environmental friendliness in blister packaging by enhancing cross-linking with hyperbranched polyols, optimizing performance through IPN structures, and improving controllability through staged reactions. This technical approach can replace solvent-based products and is particularly suitable for high-end packaging and high-temperature transportation scenarios. DETAILED DESCRIPTION

[0022] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0023] Example 1

[0024] A method for preparing a water-based blister oil comprises the following steps:

[0025] (1) Prepare the following raw materials: 80 parts by weight of diisocyanate, 35 parts by weight of polyester diol, 25 parts by weight of hyperbranched polyol, 0.1 parts by weight of a first catalyst, 4 parts by weight of a chain extender, 8 parts by weight of acrylic acid, 4 parts by weight of 2-hydroxyethyl acrylate, 3 parts by weight of methyl methacrylate, 0.03 parts by weight of an initiator, 0.1 parts by weight of an emulsifier, 60 parts by weight of acetone, and 100 parts by weight of deionized water;

[0026] (2) Synthesis of polyacrylate: Acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate and emulsifier were added to 1 / 2 of deionized water, stirred evenly, and then an initiator was added. The temperature was raised to 80°C and the reaction was carried out for 2.5 hours to obtain a hydroxy polyacrylate mixture.

[0027] (3) Synthesis of polyurethane: Add 1 / 2 of diisocyanate, polyester diol and part of the first catalyst to the reactor, heat to 80°C, keep reacting for 3.5 hours, then add the remaining diisocyanate, hyperbranched polyol and part of the first catalyst, continue to keep warm and react for 3.5 hours, then cool to 50°C, then add hydroxy polyacrylate mixture, chain extender, the remaining first catalyst and acetone mixture consisting of 2 / 3 of acetone, keep warm and react for 2.5 hours, add the remaining acetone to dilute, then add the remaining deionized water for emulsification, and after recovering the acetone, obtain water-based blister oil.

[0028] In this embodiment, the diisocyanate is isophorone diisocyanate, the polyester polyol is poly(hexamethylene adipate diol), the first catalyst is dibutyl tin dilaurate, the chain extender is a mixture of 2,2-dihydroxymethylpropionic acid and 1,4-butanediol-2-sodium sulfonate in a ratio of 1:2, the initiator is a mixture of ammonium persulfate and potassium persulfate in a weight ratio of 1:1, and the emulsifier is a mixture of sorbitan stearate and polyoxyethylene sorbitan monostearate in a weight ratio of 1:1.

[0029] The preparation method of the hyperbranched polyol comprises the following steps: adding dihydric alcohol, pentaerythritol and dimethylol acid in a mass ratio of 1:2:12 into a reaction device, fully stirring and mixing uniformly, heating to 130 DEG C, adding 0.6wt% of the second catalyst of dihydric alcohol, continuously reacting for 2.5h, vacuumizing for 3h, terminating the reaction when the acid value is stable, cooling to below 50 DEG C, dissolving the product with acetone and then pouring into n-hexane for precipitation, and finally vacuum drying to obtain the hyperbranched polyol.

[0030] The dihydric alcohol is propylene glycol.

[0031] Example 2

[0032] A preparation method of an aqueous blister oil, comprising the following steps:

[0033] (1) preparing raw materials: 70 parts by weight of diisocyanate, 30 parts by weight of polyester diol, 20 parts by weight of hyperbranched polyol, 0.1 part by weight of first catalyst, 4 parts by weight of chain extender, 6 parts by weight of acrylic acid, 4 parts by weight of 2-hydroxyethyl acrylate, 3 parts by weight of methyl methacrylate, 0.02 parts by weight of initiator, 0.1 parts by weight of emulsifier, 50 parts by weight of acetone and 80 parts by weight of deionized water;

[0034] (2) synthesis of polyacrylate: acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate and emulsifier are added into 1 / 3 of deionized water, after stirring uniformly, the initiator is added, heated to 80 DEG C, and reacted for 2.5h to obtain a hydroxyl polyacrylate mixture;

[0035] (3) synthesis of polyurethane: 1 / 2 of diisocyanate, polyester diol and part of the first catalyst are added into a reaction kettle, heated to 90 DEG C, and reacted for 3h, then the remaining diisocyanate, hyperbranched polyol and part of the first catalyst are added, and the reaction is continued for 3h, then the temperature is lowered to 60 DEG C, then the hydroxyl polyacrylate mixture, the chain extender, the remaining first catalyst and 1 / 2 of the acetone mixture are added, and the reaction is kept for 2h, then the remaining acetone is diluted, and then the remaining deionized water is added for emulsification, after recovering the acetone, the aqueous blister oil is obtained.

[0036] In the embodiment, the diisocyanate is hexamethylene diisocyanate, the polyester polyol is polybutylene adipate diol, the first catalyst is dibutyltin dilaurate, the chain extender is a mixture composed of 2,2-dimethylol propionic acid and 1,4-butanediol-2-sodium sulfonate in a mass ratio of 1:1, the initiator is ammonium persulfate, and the emulsifier is a mixture composed of sorbitan stearate and polyoxyethylene sorbitan monostearate in a weight ratio of 1:1.

[0037] In this embodiment, the preparation method of the hyperbranched polyol includes the following steps: adding diol, pentaerythritol and dihydroxymethyl acid in a mass ratio of 1:1:7 to a reaction device, stirring and mixing them uniformly, heating to 140° C., adding 1 wt% of a second catalyst based on the diol, continuing the reaction for 2 hours, and then vacuuming and reacting for 3 hours. When the acid value is stable, the reaction is terminated, the temperature is lowered to below 50° C., the product is dissolved in acetone and poured into n-hexane for precipitation, and finally vacuum drying to obtain a hyperbranched polyol.

[0038] The diol is 1,4-butanediol.

[0039] Example 3

[0040] A method for preparing a water-based blister oil comprises the following steps:

[0041] (1) preparing raw materials: 90 parts by weight of diisocyanate, 40 parts by weight of polyester diol, 30 parts by weight of hyperbranched polyol, 0.2 parts by weight of a first catalyst, 5 parts by weight of a chain extender, 10 parts by weight of acrylic acid, 6 parts by weight of 2-hydroxyethyl acrylate, 4 parts by weight of methyl methacrylate, 0.04 parts by weight of an initiator, 0.2 parts by weight of an emulsifier, 70 parts by weight of acetone, and 120 parts by weight of deionized water;

[0042] (2) Synthesis of polyacrylate: Acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate and emulsifier were added to 1 / 2 of deionized water, stirred evenly, and then an initiator was added. The temperature was raised to 90°C and the reaction was carried out for 1.5 hours to obtain a hydroxy polyacrylate mixture.

[0043] (3) Synthesis of polyurethane: Add 2 / 3 of diisocyanate, polyester diol and part of the first catalyst to the reactor, heat to 90°C, keep reacting for 3 hours, then add the remaining diisocyanate, hyperbranched polyol and part of the first catalyst, continue to keep warm and react for 3 hours, then cool to 60°C, then add hydroxy polyacrylate mixture, chain extender, the remaining first catalyst and acetone mixture consisting of 1 / 3 acetone, keep warm and react for 2 hours, add the remaining acetone to dilute, then add the remaining deionized water for emulsification, and after recovering the acetone, obtain water-based blister oil.

[0044] In this embodiment, the diisocyanate is isophorone diisocyanate, the polyester polyol is polyneopentyl adipate diol, the first catalyst is dibutyltin dilaurate, the chain extender is 2,2-dihydroxymethylpropionic acid, the initiator is potassium persulfate, and the emulsifier is a mixture of sorbitan stearate and polyoxyethylene sorbitan monostearate in a weight ratio of 1:1.

[0045] In this embodiment, the preparation method of the hyperbranched polyol includes the following steps: adding diol, pentaerythritol and dihydroxymethyl acid in a mass ratio of 1:2:17 to a reaction device, stirring and mixing them uniformly, heating to 140° C., adding a second catalyst of 0.4 wt % of the diol, continuing the reaction for 2 hours, and then vacuuming and reacting for 2 hours. When the acid value is stable, the reaction is terminated, the temperature is lowered to below 50° C., the product is dissolved in acetone and poured into n-hexane for precipitation, and finally vacuum drying to obtain a hyperbranched polyol.

[0046] Wherein, the diol is a mixture of propylene glycol and 1,4-butanediol in a weight ratio of 1:1.

[0047] Example 4

[0048] A method for preparing a water-based blister oil comprises the following steps:

[0049] (1) Prepare the following raw materials: 75 parts by weight of diisocyanate, 32 parts by weight of polyester diol, 21 parts by weight of hyperbranched polyol, 0.15 parts by weight of a first catalyst, 4 parts by weight of a chain extender, 6 parts by weight of acrylic acid, 5 parts by weight of 2-hydroxyethyl acrylate, 3 parts by weight of methyl methacrylate, 0.02 parts by weight of an initiator, 0.15 parts by weight of an emulsifier, 60 parts by weight of acetone, and 100 parts by weight of deionized water;

[0050] (2) Synthesis of polyacrylate: Acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate and emulsifier were added to 1 / 2 of deionized water, stirred evenly, and then an initiator was added. The temperature was raised to 90°C and the reaction was carried out for 2 hours to obtain a hydroxy polyacrylate mixture.

[0051] (3) Synthesis of polyurethane: 1 / 2 of diisocyanate, polyester diol and part of the first catalyst were added to the reactor, the temperature was raised to 90°C, and the reaction was maintained for 3 hours. Then, the remaining diisocyanate, hyperbranched polyol and part of the first catalyst were added, and the reaction was continued for 3 hours. Then, the temperature was lowered to 50°C, and an acetone mixture consisting of a hydroxy polyacrylate mixture, a chain extender, the remaining first catalyst and 1 / 2 of acetone was added. The mixture was heated for 2.5 hours, the remaining acetone was added for dilution, and the remaining deionized water was added for emulsification. After the acetone was recovered, the water-based blister oil was obtained.

[0052] In this embodiment, the diisocyanate is isophorone diisocyanate, the polyester polyol is a mixture of polyhexamethylene adipate diol, polybutylene adipate diol and polyneopentyl adipate diol in a weight ratio of 1:1:1, the polyester polyol is polyhexamethylene adipate diol, the first catalyst is dibutyltin dilaurate, the chain extender is a mixture of 2,2-dihydroxymethylpropionic acid and 1,4-butanediol-2-sodium sulfonate in a ratio of 1:1-2, the initiator is a mixture of ammonium persulfate and potassium persulfate in a weight ratio of 1:1, and the emulsifier is a mixture of dehydrated sorbitan stearate and polyoxyethylene sorbitan monostearate in a weight ratio of 1:1.

[0053] In this embodiment, the preparation method of the hyperbranched polyol includes the following steps: adding diol, pentaerythritol and dihydroxymethyl acid in a mass ratio of 1:2:10 to a reaction device, stirring and mixing them uniformly, heating to 13°C, adding 0.8wt% of a second catalyst based on the diol, continuing the reaction for 3 hours, and then vacuuming and reacting for 3 hours. When the acid value is stable, the reaction is terminated, the temperature is lowered to below 50°C, the product is dissolved in acetone, poured into n-hexane for precipitation, and finally vacuum dried to obtain a hyperbranched polyol.

[0054] In this embodiment, the diol is propylene glycol.

[0055] Comparative Example 1

[0056] In step (3) of this comparative example 1, the polyurethane was synthesized using a one-step synthesis method. All of the diisocyanate, polyester diol, hyperbranched polyol, and a portion of the first catalyst were added to a reaction kettle. The temperature was raised to 90° C., the reaction was maintained for 4 hours, and then the temperature was lowered to 60° C. The remaining reaction conditions were the same as those in Example 1.

[0057] Comparative Example 2

[0058] In this comparative example 1, in step (3) of synthesizing the polyurethane, a one-step synthesis method was adopted, and the hyperbranched polyol was replaced with an equal weight of polyester diol. The remaining reaction conditions were the same as those in Example 1.

[0059] Comparative Example 3

[0060] In the step (3) of synthesizing the polyurethane in Comparative Example 1, a one-step synthesis method was adopted, and an equal weight of polyester diol was replaced with an equal weight of hyperbranched polyol. The remaining reaction conditions were the same as those in Example 1.

[0061] Comparative Example 4

[0062] In the preparation method of the hyperbranched polyol in Comparative Example 1, pentaerythritol and dihydroxymethyl acid were added to the reaction apparatus at a mass ratio of 1:4, and no diol was added. The remaining reaction conditions were the same as in Example 1.

[0063] Example 1 and Comparative Examples 1-4 were prepared according to GB / T2791-1995. The blister oils of Example 1 and Comparative Examples 1-4 were coated on a substrate and hot pressed at a temperature of 50° C. to prepare samples. The test indicators and methods for the samples were as follows:

[0064] (1) Peel strength: 180° peel test was performed according to GB / T2791-1995 standard.

[0065] (2) Temperature resistance: The sample was placed in an environment of 80°C for 2 hours, and then a 180° peel test was performed according to GB / T2791-1995 standard.

[0066] (3) Stability: After the sample was placed at room temperature for 72 hours, a 180° peel test was performed according to the GB / T2791-1995 standard.

[0067] The test results are shown in the following table:

[0068]

[0069] As can be seen from the test results in the above table, the water-based blister oil of the present invention has high peel strength, high temperature resistance, and strong stability. The initial peel strength of Example 1 reached 7.6N / mm, which is 6.3% to 18.8% higher than that of Comparative Examples 1-4 (6.4-7.1N / mm), indicating that its molecular design (such as hyperbranched polyol crosslinking or polyurethane-acrylate interpenetrating network) effectively improves interfacial adhesion. After high-temperature aging at 80°C, the peel strength retention rate of Example 1 was 80.3% (6.1 / 7.6), far higher than the 74.6% to 65.6% of Comparative Examples 1-4, indicating that its cross-linked network structure is more stable at high temperatures and has stronger resistance to thermal degradation. After being placed at room temperature for 72 hours, the peel strength of Example 1 increased (7.8N / mm) instead of decreasing, possibly due to the post-curing effect; while Comparative Examples 3 and 4 showed a significant decrease (6.0-6.5N / mm), reflecting that their resin systems are susceptible to environmental humidity or oxidation.

[0070] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A method for preparing an aqueous blister oil, characterized in that: The steps include: (1) preparing raw materials: 70-90 parts by weight of diisocyanate, 30-40 parts by weight of polyester diol, 20-30 parts by weight of hyperbranched polyol, 0.1-0.2 parts by weight of a first catalyst, 4-5 parts by weight of a chain extender, 5-10 parts by weight of acrylic acid, 3-6 parts by weight of 2-hydroxyethyl acrylate, 2-4 parts by weight of methyl methacrylate, 3-5 parts by weight of nano-silica, 0.02-0.04 parts by weight of an initiator, 0.1-0.2 parts by weight of an emulsifier, 50-70 parts by weight of acetone, and 80-120 parts by weight of deionized water; (2) Synthesis of polyacrylate: Acrylic acid, 2-hydroxyethyl acrylate, methyl methacrylate, nano-silica and emulsifier are added to 1 / 3-1 / 2 of deionized water, stirred evenly, and then an initiator is added. The temperature is raised to 80-90°C and the reaction is carried out for 1.5-2.5 hours to obtain a hydroxy polyacrylate mixture. (3) Synthesis of polyurethane: Add not less than 1 / 2 of diisocyanate, polyester diol and part of the first catalyst to the reactor, heat to 70-90°C, keep reacting for 3-4h, then add the remaining diisocyanate, hyperbranched polyol and part of the first catalyst, continue to keep warm and react for 3-4h, then cool to 50-60°C, then add hydroxy polyacrylate mixture, chain extender, the remaining first catalyst and acetone mixture consisting of no more than 2 / 3 of acetone, keep warm and react for 2-3h, add the remaining acetone to dilute, then add the remaining deionized water for emulsification, and after recovering the acetone, obtain water-based blister oil.

2. The method for preparing an aqueous blister oil according to claim 1, wherein: The diisocyanate is one or a combination of isophorone diisocyanate and hexamethylene diisocyanate.

3. The method for preparing an aqueous blister oil according to claim 1, wherein: The polyester polyol is one or more of polyhexamethylene adipate diol, polybutylene adipate diol and polyneopentyl adipate diol.

4. The method for preparing an aqueous blister oil according to claim 1, wherein: The first catalyst is dibutyltin dilaurate.

5. The method for preparing an aqueous blister oil according to claim 1, wherein: The chain extender is one or more of 2,2-dihydroxymethylpropionic acid and 1,4-butanediol-2-sodium sulfonate.

6. The method for preparing an aqueous blister oil according to claim 1, wherein: The initiator is one or more of ammonium persulfate and potassium persulfate.

7. The method for preparing an aqueous blister oil according to claim 1, wherein: The emulsifier is a combination of sorbitan stearate and polyoxyethylene sorbitan monostearate.

8. The method for preparing an aqueous blister oil according to claim 1, wherein: The preparation method of the hyperbranched polyol comprises the following steps: adding diol, pentaerythritol and dihydroxymethyl acid in a mass ratio of 1:1-2:7-17 into a reaction device, fully stirring and mixing, heating to 120-140° C., adding a second catalyst in an amount of 0.4-1 wt % of the diol, continuing the reaction for 2-3 hours, then vacuuming and reacting for 2-3 hours, terminating the reaction when the acid value is stable, cooling to below 50° C., dissolving the product with acetone, pouring it into n-hexane for precipitation, and finally vacuum drying to obtain the hyperbranched polyol.

9. The method for preparing an aqueous blister oil according to claim 8, wherein: The diol is one or more of propylene glycol and 1,4-butanediol.

10. A water-based blister oil, characterized by: The method for preparing the aqueous blister oil according to any one of claims 1 to 9 is worthy of application.

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