Biodegradable water-based plastic-replacing oil and preparation method thereof

Abstract

The invention relates to biodegradable water-based plastic-replacing oil and a preparation method thereof, and belongs to the technical field of water-based plastic-replacing oil. The biodegradable water-based plastic replacing oil is prepared from the following components: modified water-based polyurethane emulsion, water-based acrylic emulsion, wax powder, matting powder, a defoaming agent, a silane coupling agent, propylene glycol and deionized water. According to the invention, titanium dioxide is used for modification, so that the dispersion and compatibility of titanium dioxide are changed, titanium dioxide can participate in the reaction of a system, and the mechanical property and high temperature resistance of the water-based plastic-replacing oil are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based plastic-replacing oils, and relates to a biodegradable water-based plastic-replacing oil and a preparation method thereof. Background Art

[0002] Water-based plastic replacement oil with water as solvent is an innovative environmentally friendly material designed to replace traditional plastic film. This material not only has environmental characteristics, but also provides the same protective effect as traditional plastic film.

[0003] Water-based plastic replacement oil is biodegradable and effectively reduces environmental pollution. Compared with traditional plastic film, it avoids the waste of resources in waste paper processing. The material exhibits the advantages of high tension, high tensile strength, strong toughness, wear resistance, folding and anti-riot, waterproof and aging resistance. It has good bonding performance with ink, no back sticking, and strong adhesion. Water-based plastic replacement oil is suitable for packaging cardboard coating in many industries such as medical, electronics, cosmetics, and education. It can achieve similar effects of laminating and filming in the printing industry, and is suitable for a variety of equipment such as printing inline, full-page UV machine, ordinary oiling machine, and thin paper local UV machine. Compared with traditional plastic replacement oil, water-based plastic replacement oil has significant advantages in environmental performance. Traditional plastic replacement oil is mostly based on petrochemical raw materials and is difficult to degrade, while water-based plastic replacement oil uses biodegradable raw materials and is more in line with modern environmental protection standards. Summary of the invention

[0004] The purpose of the present invention is to provide a biodegradable water-based plastic replacement oil and a preparation method thereof. The present invention modifies the water-based plastic replacement oil by titanium dioxide, changes its dispersibility and compatibility, and enables it to participate in the reaction of the system, thereby significantly improving the mechanical properties and high temperature resistance of the water-based plastic replacement oil.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A biodegradable water-based plastic replacement oil comprises the following components by weight: 70-82 parts of modified waterborne polyurethane emulsion, 15-21 parts of waterborne acrylic emulsion, 2-4 parts of wax powder, 2-4 parts of matting powder, 0.3-0.5 parts of defoaming agent, 1.2-1.8 parts of silane coupling agent, 2-3 parts of propylene glycol and 20-40 parts of deionized water.

[0006] As a preferred technical solution of the present invention, the solid content of the aqueous acrylic emulsion is 35-45%, and the pH value is 7-9.

[0007] As a preferred technical solution of the present invention, the wax powder is PE wax with a particle size of 2-5 μm.

[0008] As a preferred technical solution of the present invention, the matting powder is Degussa TS-100; the defoaming agent is TEGO Airex 904W.

[0009] As a preferred technical solution of the present invention, the silane coupling agent is one or more of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

[0010] As a preferred technical solution of the present invention, the preparation method of the modified polyurethane emulsion comprises the following steps: After preheating the polyether diol, diisocyanate and an organic tin catalyst are added and stirred to react to obtain a prepolymer, 2,2-hydroxymethylpropionic acid and modified titanium dioxide are added to the prepolymer to continue the reaction, 1,4-butanediol is added, and after cooling, triethylamine and deionized water are added and dispersed to obtain a modified waterborne polyurethane emulsion.

[0011] As a preferred technical solution of the present invention, in the preparation of the modified polyurethane emulsion, the preheating is heating to a temperature of 60-80°C; the stirring reaction time is 2-4h; the continued reaction is reacting at a temperature of 60-80°C for 4-6h; and the cooling is cooling to 25-40°C.

[0012] As a preferred technical solution of the present invention, in the preparation of the modified polyurethane emulsion, the polyether diol, diisocyanate, organic tin catalyst, 2,2-hydroxymethylpropionic acid, modified titanium dioxide, 1,4-butanediol, triethylamine and deionized water are 20-30:8-15:0.15-0.16:2-4:2.4-3.0:1.2-2.0:5-8:60-70; the polyether diol is PPG3000; the diisocyanate is one or more of IPDI, TDI, MDI and HMDI; and the organic tin catalyst is dibutyltin laurate.

[0013] As a preferred technical solution of the present invention, the preparation method of the modified titanium dioxide comprises the following steps: S1, mixing titanium dioxide and isobutanol, adding chitosan solution, ultrasonically treating, and standing to obtain a mixed solution; S2. In an inert atmosphere, the mixed solution, anhydrous ethanol and the composite monomer are heated and stirred, and then filtered, washed and vacuum dried to obtain an intermediate object; S3. After mixing the intermediate object with anhydrous ethanol, adding thioglycerol and a photoinitiator and treating with ultraviolet light, centrifuging to obtain a solid, washing it, and vacuum drying it to obtain modified titanium dioxide.

[0014] As a preferred technical solution of the present invention, in step S1, the ultrasonic treatment is performed at a power of 600-800 W for 40-50 min; the standing time is 2-3 h; the mass ratio of the titanium dioxide, isobutanol and chitosan solution is 16-17:0.8-1.0:85-90; the chitosan solution is prepared by mixing chitosan and acetic acid solution in a mass ratio of 1.2:18-20; and the mass fraction of the acetic acid solution is 3%.

[0015] As a preferred technical solution of the present invention, in step S2, the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at a temperature of 56-65°C and a speed of 400-600 rpm for 6-8 hours; the washing is washing with anhydrous ethanol for 3 times and then washing with deionized water for 2 times; the vacuum drying is vacuum drying at a temperature of 80-90°C to constant weight; the mass ratio of the mixed solution, anhydrous ethanol and composite monomer is 120:8-10:2.8-3.2; the composite monomer is composed of citral and 5-hydroxymethylfurfural in a mass ratio of 4.2-4.6:2.3-2.5.

[0016] As a preferred technical solution of the present invention, in step S3, the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365nm for 10-12h; the washing is washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 80-90°C for 8-10h; the mass ratio of the intermediate object, anhydrous ethanol, thioglycerol and photoinitiator is 15-18:50-60:2.8-3.2:0.09-0.11; and the photoinitiator is photoinitiator 1173.

[0017] A method for preparing a biodegradable water-based plastic-replacing oil comprises the following steps: After stirring wax powder, matting powder, propylene glycol, silane coupling agent and deionized water at 600-800 rpm for 15-20 minutes, add modified waterborne polyurethane emulsion and waterborne acrylic emulsion and continue stirring for 8-10 minutes, add defoaming agent and stir at 1000-1200 rpm for 5-8 minutes to obtain the product.

[0018] Beneficial effects of the present invention: The present invention forms a stable self-assembled network structure through titanium dioxide and chitosan, significantly improving the dispersion effect of titanium dioxide, and then grafts citral, 5-hydroxymethylfurfural and thioglycerol to participate in the reaction of the system, significantly improving the mechanical properties and high temperature resistance of the water-based plastic replacement oil. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments. Example 1

[0020] A biodegradable water-based plastic replacement oil comprises the following components by weight: 70 parts of modified waterborne polyurethane emulsion, 15 parts of waterborne acrylic emulsion, 2 parts of wax powder, 2 parts of matting powder, 0.3 parts of defoaming agent, 1.2 parts of silane coupling agent, 2 parts of propylene glycol and 20 parts of deionized water; The water-based acrylic emulsion has a solid content of 35% and a pH value of 7; The wax powder is PE wax with a particle size of 2 μm; The silane coupling agent is silane coupling agent KH550.

[0021] The preparation method of the modified polyurethane emulsion comprises the following steps: After preheating the polyether diol, diisocyanate and an organic tin catalyst are added and stirred to react to obtain a prepolymer, 2,2-hydroxymethyl propionic acid and modified titanium dioxide are added to the prepolymer to continue the reaction, 1,4-butanediol is added, and after cooling, triethylamine and deionized water are added and dispersed to obtain a modified waterborne polyurethane emulsion; Among them, the preheating is heating to 60°C; the stirring reaction time is 2h; the continued reaction is reacting at 60°C for 4h; the cooling is cooling to 25°C; the polyether diol, diisocyanate, organic tin catalyst, 2,2-hydroxymethylpropionic acid, modified titanium dioxide, 1,4-butanediol, triethylamine and deionized water are 20:8:0.15:2:2.4:1.2:5:60; the polyether diol is PPG3000; the diisocyanate is IPDI; the organic tin catalyst is dibutyltin laurate.

[0022] The preparation method of the modified titanium dioxide comprises the following steps: S1. Mix titanium dioxide and isobutanol, add chitosan solution for ultrasonic treatment, and let it stand to obtain a mixed solution; wherein the ultrasonic treatment is 40 minutes at 600W power; the standing time is 2 hours; the mass ratio of titanium dioxide, isobutanol and chitosan solution is 16:0.8:85; the chitosan solution is prepared by mixing chitosan and acetic acid solution in a mass ratio of 1.2:18; the mass fraction of the acetic acid solution is 3%; S2. Under an inert atmosphere, the mixed liquid, anhydrous ethanol and composite monomer are heated and stirred, and then filtered, washed and vacuum dried to obtain an intermediate object; wherein the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at 56°C and 400 rpm for 6 hours; the washing is washing with anhydrous ethanol for 3 times and then washing with deionized water for 2 times; the vacuum drying is vacuum drying at 80°C to constant weight; the mass ratio of the mixed liquid, anhydrous ethanol and composite monomer is 120:8:2.8; the composite monomer is composed of citral and 5-hydroxymethylfurfural in a mass ratio of 4.2:2.3.

[0023] S3. After mixing the intermediate object and anhydrous ethanol, add thioglycerol and a photoinitiator, treat with ultraviolet light, centrifuge to obtain the solid, wash, and vacuum dry to obtain modified titanium dioxide; wherein the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365nm for 10 hours; the washing is washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 80°C for 8 hours; the mass ratio of the intermediate object, anhydrous ethanol, thioglycerol and photoinitiator is 15:50:2.8:0.09.

[0024] A method for preparing a biodegradable water-based plastic-replacing oil comprises the following steps: After the wax powder, matting powder, propylene glycol, silane coupling agent and deionized water are stirred at 600 rpm for 15 minutes, the modified waterborne polyurethane emulsion and waterborne acrylic emulsion are added and the stirring is continued for 8 minutes, and the defoaming agent is added and the stirring is continued at 1000 rpm for 5 minutes to obtain the product. Example 2

[0025] A biodegradable water-based plastic replacement oil comprises the following components by weight: 76 parts of modified waterborne polyurethane emulsion, 18 parts of waterborne acrylic emulsion, 3 parts of wax powder, 3 parts of matting powder, 0.4 parts of defoaming agent, 1.5 parts of silane coupling agent, 2.5 parts of propylene glycol and 30 parts of deionized water; The water-based acrylic emulsion has a solid content of 40% and a pH value of 8; The wax powder is PE wax with a particle size of 4 μm; The silane coupling agent is silane coupling agent KH550.

[0026] The preparation method of the modified polyurethane emulsion comprises the following steps: After preheating the polyether diol, diisocyanate and an organic tin catalyst are added and stirred to react to obtain a prepolymer, 2,2-hydroxymethyl propionic acid and modified titanium dioxide are added to the prepolymer to continue the reaction, 1,4-butanediol is added, and after cooling, triethylamine and deionized water are added and dispersed to obtain a modified waterborne polyurethane emulsion; Among them, the preheating is heating to 70°C; the stirring reaction time is 3 hours; the continued reaction is reacting at 70°C for 5 hours; the cooling is cooling to 32°C; the polyether diol, diisocyanate, organic tin catalyst, 2,2-hydroxymethylpropionic acid, modified titanium dioxide, 1,4-butanediol, triethylamine and deionized water are 25:12:0.155:3:2.7:1.6:6:65; the polyether diol is PPG3000; the diisocyanate is IPDI; the organic tin catalyst is dibutyltin laurate.

[0027] The preparation method of the modified titanium dioxide comprises the following steps: S1. Mix titanium dioxide and isobutanol, add chitosan solution for ultrasonic treatment, and let stand to obtain a mixed solution; wherein the ultrasonic treatment is 700W power ultrasound for 45 minutes; the standing time is 2.5 hours; the mass ratio of titanium dioxide, isobutanol and chitosan solution is 16.5:0.9:88; the chitosan solution is prepared by mixing chitosan and acetic acid solution in a mass ratio of 1.2:19; the mass fraction of the acetic acid solution is 3%; S2. Under an inert atmosphere, the mixed liquid, anhydrous ethanol and composite monomer are heated and stirred, and then filtered, washed and vacuum dried to obtain an intermediate object; wherein the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at 60°C and 500 rpm for 7 hours; the washing is washing with anhydrous ethanol for 3 times and then washing with deionized water for 2 times; the vacuum drying is vacuum drying at 85°C to constant weight; the mass ratio of the mixed liquid, anhydrous ethanol and composite monomer is 120:9:3; the composite monomer is composed of citral and 5-hydroxymethylfurfural in a mass ratio of 4.4:2.4.

[0028] S3. After mixing the intermediate object and anhydrous ethanol, add thioglycerol and a photoinitiator, treat with ultraviolet light, centrifuge to obtain the solid, wash, and vacuum dry to obtain modified titanium dioxide; wherein the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365nm for 11 hours; the washing is washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 85°C for 9 hours; the mass ratio of the intermediate object, anhydrous ethanol, thioglycerol and photoinitiator is 16:55:3:0.1.

[0029] A method for preparing a biodegradable water-based plastic-replacing oil comprises the following steps: After the wax powder, matting powder, propylene glycol, silane coupling agent and deionized water are stirred at 700 rpm for 18 minutes, the modified waterborne polyurethane emulsion and waterborne acrylic emulsion are added and the stirring is continued for 9 minutes, and the defoaming agent is added and the stirring is continued at 1100 rpm for 6 minutes to obtain the product. Example 3

[0030] A biodegradable water-based plastic replacement oil comprises the following components by weight: 82 parts of modified waterborne polyurethane emulsion, 21 parts of waterborne acrylic emulsion, 4 parts of wax powder, 4 parts of matting powder, 0.5 parts of defoaming agent, 1.8 parts of silane coupling agent, 3 parts of propylene glycol and 40 parts of deionized water; The water-based acrylic emulsion has a solid content of 45% and a pH value of 9; The wax powder is PE wax with a particle size of 5 μm; The silane coupling agent is silane coupling agent KH550.

[0031] The preparation method of the modified polyurethane emulsion comprises the following steps: After preheating the polyether diol, diisocyanate and an organic tin catalyst are added and stirred to react to obtain a prepolymer, 2,2-hydroxymethyl propionic acid and modified titanium dioxide are added to the prepolymer to continue the reaction, 1,4-butanediol is added, and after cooling, triethylamine and deionized water are added and dispersed to obtain a modified waterborne polyurethane emulsion; Among them, the preheating is heating to 80°C; the stirring reaction time is 4 hours; the continued reaction is reacting at 80°C for 6 hours; the cooling is cooling to 40°C; the polyether diol, diisocyanate, organic tin catalyst, 2,2-hydroxymethylpropionic acid, modified titanium dioxide, 1,4-butanediol, triethylamine and deionized water are 30:15:0.16:4:3.0:2.0:8:70; the polyether diol is PPG3000; the diisocyanate is IPDI; the organic tin catalyst is dibutyltin laurate.

[0032] The preparation method of the modified titanium dioxide comprises the following steps: S1. Mix titanium dioxide and isobutanol, add chitosan solution for ultrasonic treatment, and let stand to obtain a mixed solution; wherein the ultrasonic treatment is 50 minutes at 800W power; the standing time is 3 hours; the mass ratio of titanium dioxide, isobutanol and chitosan solution is 17:1.0:90; the chitosan solution is prepared by mixing chitosan and acetic acid solution in a mass ratio of 1.2:20; the mass fraction of the acetic acid solution is 3%; S2. Under an inert atmosphere, the mixed liquid, anhydrous ethanol and composite monomer are heated and stirred, and then filtered, washed and vacuum dried to obtain an intermediate object; wherein the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at 65°C and 600 rpm for 8 hours; the washing is washing with anhydrous ethanol for 3 times and then washing with deionized water for 2 times; the vacuum drying is vacuum drying at 90°C to constant weight; the mass ratio of the mixed liquid, anhydrous ethanol and composite monomer is 120:10:3.2; the composite monomer is composed of citral and 5-hydroxymethylfurfural in a mass ratio of 4.6:2.5.

[0033] S3. After mixing the intermediate object and anhydrous ethanol, add thioglycerol and a photoinitiator, treat with ultraviolet light, centrifuge to obtain the solid, wash, and vacuum dry to obtain modified titanium dioxide; wherein the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365nm for 12h; the washing is washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 90°C for 10h; the mass ratio of the intermediate object, anhydrous ethanol, thioglycerol and photoinitiator is 18:60:3.2:0.11.

[0034] A method for preparing a biodegradable water-based plastic-replacing oil comprises the following steps: After the wax powder, matting powder, propylene glycol, silane coupling agent and deionized water are stirred at 800 rpm for 20 minutes, the modified waterborne polyurethane emulsion and waterborne acrylic emulsion are added and the stirring is continued for 10 minutes, and the defoaming agent is added and the stirring is continued at 1200 rpm for 8 minutes to obtain the product. Example 4

[0035] Compared with Example 3, Example 4 is different in that the silane coupling agent is silane coupling agent KH560, and the other components, preparation steps and parameters are the same.

[0036] Comparative Example 1 Compared with Example 3, Comparative Example 1 is different in that chitosan is not used, and the other components, preparation steps and parameters are the same.

[0037] Comparative Example 2 Compared with Example 3, the difference in Comparative Example 2 is that the composite monomer is citral, and the other components, preparation steps and parameters are the same.

[0038] Comparative Example 3 Compared with Example 3, the difference in Comparative Example 3 is that the composite monomer is 5-hydroxymethylfurfural, and the other components, preparation steps and parameters are the same.

[0039] Comparative Example 4 Compared with Example 3, Comparative Example 4 is different in that no composite monomer is used, and the remaining components, preparation steps and parameters are the same.

[0040] Comparative Example 5 Compared with Example 3, Comparative Example 5 is different in that thioglycerol is not used, and the remaining components, preparation steps and parameters are the same.

[0041] The water-based plastic replacement oils prepared in Examples 1-4 and Comparative Examples 1-5 were tested for the following properties, and the test results are shown in Table 1.

[0042] Hardness test: According to GB / T6739-2006 pencil hardness test, the pencil is pressed down at a 45° angle under a load of 500g; High temperature resistance test: bake the sample at 150℃ for 1 hour and observe the surface of the cured film; Table 1

[0043] From the test results in Table 1, it can be seen that compared with Comparative Examples 1-5, the water-based plastic replacement oil prepared in Examples 1-4 has excellent mechanical properties and high temperature resistance after solidification.

[0044] The present invention uses isobutanol as a dispersion medium, and uses titanium dioxide and chitosan for ultrasonic treatment to promote chitosan to penetrate into the interior of titanium dioxide. Through hydrogen bonding and electrostatic effects, chitosan and titanium dioxide build a self-assembled stable network structure, in which chitosan plays a bridging role, significantly improving the dispersion effect of titanium dioxide in the system. Subsequently, by introducing citral and 5-hydroxymethylfurfural containing aldehyde groups, they react with the amino groups in the chitosan molecules to form Schiff base bonds, thereby constructing a network-like cross-linked structure. Now, the mechanical properties and high temperature resistance of the aqueous plastic substitute are increased. The hydrogen bonding between the hydroxyl group of 5-hydroxymethylfurfural and chitosan is utilized to make the layered stacking structure of the cross-linked composite material more compact. 5-Hydroxymethylfurfural contains a high-temperature resistant furan structure. Combined with the hydrophobic carbon chain of citral, the non-polarity and hydrophobicity of the mixed monomer are utilized to jointly improve the stability of the modified titanium dioxide and the dispersibility of the modified titanium dioxide in the aqueous plastic substitute system. In addition, the modified titanium dioxide, due to the introduction of unsaturated carbon-carbon double bonds, participates in the copolymerization reaction of the system. Combined with the grafted thioglycerol, it contains multiple active hydroxyl groups and can react chemically with diisocyanate, thereby increasing the binding force of the modified titanium dioxide, aqueous polyurethane emulsion, and aqueous acrylic emulsion system, and significantly improving its mechanical properties and high temperature resistance.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A biodegradable water-based plastic replacement oil, characterized in that: The components include the following by weight: 70-82 parts of modified waterborne polyurethane emulsion, 15-21 parts of waterborne acrylic emulsion, 2-4 parts of wax powder, 2-4 parts of matting powder, 0.3-0.5 parts of defoaming agent, 1.2-1.8 parts of silane coupling agent, 2-3 parts of propylene glycol and 20-40 parts of deionized water; The preparation method of the modified polyurethane emulsion comprises the following steps: After preheating the polyether diol, diisocyanate and an organic tin catalyst are added and stirred to react to obtain a prepolymer, 2,2-hydroxymethyl propionic acid and modified titanium dioxide are added to the prepolymer to continue the reaction, 1,4-butanediol is added, and after cooling, triethylamine and deionized water are added and dispersed to obtain a modified waterborne polyurethane emulsion; The preparation method of the modified titanium dioxide comprises the following steps: S1, mixing titanium dioxide and isobutanol, adding chitosan solution, ultrasonically treating, and standing to obtain a mixed solution; S2. In an inert atmosphere, the mixed solution, anhydrous ethanol and the composite monomer are heated and stirred, and then filtered, washed and vacuum dried to obtain an intermediate object; S3. After mixing the intermediate object with anhydrous ethanol, adding thioglycerol and a photoinitiator and treating with ultraviolet light, centrifuging to obtain a solid, washing it, and vacuum drying it to obtain modified titanium dioxide.

2. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: The solid content of the aqueous acrylic emulsion is 35-45%, and the pH value is 7-9; the wax powder is PE wax with a particle size of 2-5 μm; and the silane coupling agent is one or more of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

3. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In the preparation of the modified polyurethane emulsion, the preheating is heating to a temperature of 60-80°C; the stirring reaction time is 2-4h; the continued reaction is reacting at a temperature of 60-80°C for 4-6h; and the cooling is cooling to 25-40°C.

4. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In the preparation of the modified polyurethane emulsion, the polyether diol, diisocyanate, organic tin catalyst, 2,2-hydroxymethyl propionic acid, modified titanium dioxide, 1,4-butanediol, triethylamine and deionized water are 20-30:8-15:0.15-0.16:2-4:2.4-3.0:1.2-2.0:5-8:60-70; the polyether diol is PPG3000; and the diisocyanate is one or more of IPDI, TDI, MDI and HMDI.

5. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In step S1, the ultrasonic treatment is performed at a power of 600-800 W for 40-50 min; the standing time is 2-3 h; the mass ratio of the titanium dioxide, isobutanol and chitosan solution is 16-17:0.8-1.0:85-90; the chitosan solution is prepared by mixing chitosan and acetic acid solution in a mass ratio of 1.2:18-20; and the mass fraction of the acetic acid solution is 3%.

6. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In step S2, the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at a temperature of 56-65°C and a speed of 400-600 rpm for 6-8 hours; the washing is washing with anhydrous ethanol for 3 times and then washing with deionized water for 2 times; the vacuum drying is vacuum drying at a temperature of 80-90°C to constant weight.

7. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In step S2, the mass ratio of the mixed liquid, anhydrous ethanol and composite monomer is 120:8-10:2.8-3.2; the composite monomer is composed of citral and 5-hydroxymethylfurfural in a mass ratio of 4.2-4.6:2.3-2.

5.

8. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In step S3, the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365nm for 10-12h; the washing is washing with anhydrous ethanol for 3 times; and the vacuum drying is vacuum drying at a temperature of 80-90°C for 8-10h.

9. The biodegradable aqueous plastic-displacing oil according to claim 1, characterized in that: In step S3, the mass ratio of the intermediate object, anhydrous ethanol, thioglycerol and photoinitiator is 15-18:50-60:2.8-3.2:0.09-0.

11.

10. A method for preparing the biodegradable aqueous plastic-displacing oil according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: stirring wax powder, matting powder, propylene glycol, silane coupling agent and deionized water at a speed of 600-800 rpm for 15-20 minutes, adding modified waterborne polyurethane emulsion and waterborne acrylic emulsion and continuing stirring for 8-10 minutes, adding defoamer and stirring at a speed of 1000-1200 rpm for 5-8 minutes to obtain the product.

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