Self-healing polyurethane artificial turf adhesive and preparation method thereof

Abstract

The present invention provides a self-healing polyurethane artificial turf adhesive and a preparation method thereof, which mainly relates to the field of polymer functional materials and their application technology. The present invention uses a diol containing a disulfide bond and an amide bond as a source of reversible covalent bonds, a diamine and a diol as soft segments, and a non-aromatic diisocyanate and a crosslinking agent trimethylolpropane trimethacrylate (TMPTMA) as hard segments to obtain the polyurethane adhesive with the functional cross-linked structure. The present invention introduces functional disulfide bonds, amide bonds and urea groups into the polyurethane adhesive, which has high self-healing properties, high adhesion, strong toughness and high shearing properties. The good adhesion and excellent self-healing properties of the polyurethane adhesive have certain advantages in the fields of electronic packaging and textile fiber bonding, and can be used in the manufacture of artificial turf.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of self-repairing adhesives, in particular to a self-healing polyurethane artificial turf adhesive and a preparation method thereof. Background Art

[0002] Self-healing polyurethane adhesives have garnered widespread attention due to their multifunctional advantages, including repairability and high toughness. They have made significant progress in areas such as electronic packaging, substrate bonding, automotive assembly, and road paving. However, traditional self-healing adhesives face challenges, such as high curing temperatures, short service life, conflicts between environmental and physical properties, and poor compatibility with substrates. Furthermore, the difficulty in balancing toughness and shear strength limits their practical application.

[0003] In recent years, cross-linked networks based on high-energy urea hydrogen bonds have been widely used in biomedicine, electronics, and interfacial bonding due to their high strength, corrosion resistance, wear resistance, self-healing properties, and ability to protect coated surfaces from UV radiation. Disulfide bonds, as relatively stable, reversible covalent bonds, can impart high flexibility while maintaining excellent mechanical properties, leading to their widespread application in self-healing and recyclable polyurethane adhesives.

[0004] Traditional one-component polyurethane adhesives have problems such as poor repair performance, poor heat resistance, low weather resistance, poor aging resistance, inability to be exposed outdoors for a long time, and poor water resistance and alkali resistance. Summary of the Invention

[0005] To address the deficiencies of the prior art, the present invention provides a novel method for preparing a self-healing polyurethane adhesive for use in artificial turf. The present invention uses a diol containing an amide bond and a disulfide bond, or a diol and a diamine containing a disulfide bond, as the polyurethane soft segment, a non-aromatic isocyanate as the hard segment, and the addition of crosslinking agents trimethylolpropane trimethacrylate (TMPTMA) and trimethylolpropane (TMP). The two-component polyurethane adhesive has high self-healing properties, high toughness, high shear strength, excellent heat resistance and aging resistance, and good compatibility with artificial turf yarn and base fabric.

[0006] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0007] A self-healing polyurethane artificial turf adhesive and a preparation method thereof, comprising a polyurethane adhesive. The polyurethane adhesive comprises two components, component A and component B:

[0008] The component A comprises a diol containing an amide bond and a disulfide bond, a diol containing a disulfide bond, a non-aromatic diisocyanate, a catalyst dibutyltin dilaurate, and an organic solvent a; wherein the molar ratio of the diol to the diisocyanate is 1.0:1.5-4.0, and the total mass ratio of the organic solvent a to the diol and the diisocyanate is 2-10:1;

[0009] Preferably, the molar ratio of the diol containing an amide bond and a disulfide bond to isophorone diisocyanate is 1.0:2.0, and the total mass ratio of the organic solvent a to the diol and diisocyanate is 4.0:1.0;

[0010] Furthermore, the diol containing a disulfide bond is one of 1,1'-dithiobismethanol, 2-hydroxyethyl disulfide, 1,1'-dithiobis(2-propanol), and 2,2'-[dithiobis(2,1-ethylenedioxy)]diethanol;

[0011] The component B comprises a diamine, a diol, a diisocyanate, a catalyst dibutyltin dilaurate, and an organic solvent b; wherein the molar ratio of the diamine to the diol is 1.0:0.5-2.0, the molar ratio of the diamine and the diol to the diisocyanate is 1.0:1.5-4.0, and the total mass ratio of the organic solvent b to the diamine, diol, and diisocyanate is 2-10:1;

[0012] Preferably, the molar ratio of diamine to diol is 1.0:1.0, the molar ratio of the first two to diisocyanate is 1.0:2.0, and the total mass ratio of organic solvent a to the diol and diisocyanate is 5.0:1.0;

[0013] Furthermore, the non-aromatic diisocyanate is isophorone diisocyanate or hexamethylene diisocyanate;

[0014] Furthermore, the diamine is any one of a mixture of polyetheramine D-230 and polyetheramine D-2000, or a mixture of polyetheramine D-400 and polyetheramine D-2000, wherein the molar ratio of polyetheramine D-230 to polyetheramine D-2000 is 1.0:0.5-10.0, and the molar ratio of polyetheramine D-400 to polyetheramine D-2000 is 1.0:0.5-20.0;

[0015] Furthermore, the diol is one of polyvinyl alcohol and polytetrafluoroethylene glycol (PTMEG-650, PTMEG-1000, PTMEG-2000, PTMEG-3000) with Mw of 47,000, 67,000, or 89,000;

[0016] The preparation process of the polyurethane artificial turf adhesive includes component A, component B, a crosslinking agent, and an organic solvent C. The crosslinking agent includes trimethylolpropane trimethacrylate and trimethylolpropane, the molar ratio of component A to component B is 1.0:0.2-5.0, the molar ratio of the first two to the crosslinking agent is 1.0:0.05-0.5, and the total mass ratio of the organic solvent C to the component A, component B, and the crosslinking agent is 1-5:1.

[0017] Preferably, the molar ratio of component A to component B is 1.0:0.75, the molar ratio of the first two to the crosslinking agent is 1.0:0.25, and the total mass ratio of the organic solvent c to the component A, component B and the crosslinking agent is 3.0:1.0;

[0018] The organic solvent a, organic solvent b and organic solvent c are the same, and are one or a mixture of tetrahydrofuran, N,N-dimethylformamide, dimethyl sulfoxide and N-methylpyrrolidone;

[0019] The synthesis process of diols containing amide bonds and disulfide bonds specifically includes the following steps:

[0020] S1: Disperse monomer C and acid binding agent D in organic solvent d and stir continuously;

[0021] S2: dispersing monomer E in organic solvent d;

[0022] S3: Place the solution obtained in S2 in a constant pressure dropping funnel and add it dropwise to the solution obtained in S1 above under nitrogen atmosphere and stirring at low temperature;

[0023] S4: After the reaction is complete, the product is washed and dried in a vacuum oven to obtain product F;

[0024] S5: Dispersing monomer G in organic solvent d, adding potassium carbonate, and stirring continuously;

[0025] S6: Add product F and potassium iodide to the solution described in S5, heat under reflux in an oil bath, and stir vigorously;

[0026] S7: cooling precipitation, recrystallization, and vacuum oven drying to obtain a diol containing amide bonds and disulfide bonds;

[0027] Furthermore, in step S1, the monomer C is 3-chloropropylamine, the acid-binding agent D is any one of pyridine and triethylamine, the solvent d is any one of anhydrous tetrahydrofuran, dichloromethane, ethanol, and N,N-dimethylformamide, the mass fraction of the acid-binding agent D is 0.05-0.5wt%, and the organic solvent d is 60-110mL;

[0028] Furthermore, in step S2, the monomer E is 2,2'-dithiobisacetyl chloride, 3-(2-chlorocarbonyl-ethyldisulfonyl)-propionyl chloride, 4,4'-dithiobisbutyryl chloride, or 3,3'-dithiobisbutyryl chloride, the molar ratio of the monomer C to the monomer E is 3.0-5.0:1.0, and the organic solvent d is 50-80 mL;

[0029] Furthermore, the monomer F in step S4 is a chlorine-terminated monomer containing an amide bond and a disulfide bond;

[0030] Furthermore, in step S5, the monomer G is one of 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol and p-hydroxyphenol, the molar ratio of the product F to the monomer G is 1.0:2.0-4.0, the molar ratio of the potassium carbonate to the monomer G is 2.0-4.0:1.0, and the organic solvent d is 80-160 mL;

[0031] Furthermore, the mass fraction of potassium iodide in step S6 is 0.02-0.1 wt %;

[0032] Furthermore, the monomer C is chloropropylamine, the acid-binding agent D is triethylamine, and the monomer E is 2,2'-dithiodiacetyl chloride, and the reaction equation for preparing a monomer containing an amide bond and a disulfide bond is as follows:

[0033] Furthermore, taking the above-mentioned monomer containing an amide bond and a disulfide bond as an example, the monomer G is 1,3-propylene glycol, and the reaction equation for preparing the diol containing an amide bond and a disulfide bond is:

[0034] Furthermore, the stirring time in step S1 is 20 min-90 min;

[0035] Furthermore, the low-temperature stirring temperature in step S3 is -30 to 10°C, the stirring time is 24 to 72 hours, and the washing process is performed 2 to 3 times with water and the solvent used;

[0036] Furthermore, the vacuum drying temperature in steps S3 and S7 is 55-70° C. and the drying time is 18-36 hours;

[0037] Furthermore, the continuous stirring time in step S5 is 30 to 90 minutes;

[0038] Furthermore, the heating temperature in step S6 is 90-115° C. and the stirring time is 20-30 hours;

[0039] Furthermore, the precipitation method in step S7 is precipitation in crushed ice, and the recrystallization is any one of n-hexane, cyclohexane, and ethanol and water in a volume ratio of 1:1;

[0040] The synthesis process of component A and component B is as follows:

[0041] (1) Dissolve a diol containing an amide bond and a disulfide bond or a diol containing a disulfide bond, a non-aromatic diisocyanate and a catalyst dibutyltin dilaurate in an organic solvent a at a temperature higher than room temperature, increase the temperature gradually, stir continuously, protect with argon, and complete the reaction, then distill under reduced pressure to obtain component A;

[0042] (2) Dissolve the diamine, diol, non-aromatic diisocyanate and catalyst dibutyltin dilaurate in organic solvent B at a temperature higher than room temperature, increase the temperature gradually, stir continuously, protect with argon, complete the reaction, and perform vacuum distillation to obtain component B;

[0043] (3) Component A, component B and the cross-linking agent are dissolved in an organic solvent C at a temperature higher than room temperature, the temperature is increased gradually, stirring is continued, the reaction is stopped, and vacuum distillation is performed to obtain a self-repairing polyurethane adhesive, which is directly encapsulated by a glue potting machine.

[0044] Furthermore, the temperature range above room temperature in steps (1), (2) and (3) is 60-110°C, the gradient heating rate is 5°C / min and the temperature fluctuation range does not exceed 30°C, the amount of organic solvent used is 50-120mL and the reduced pressure distillation temperature is 40-120°C;

[0045] Furthermore, the continuous stirring method in steps (1), (2) and (3) is mechanical stirring, the stirring rate is 200-1000 rpm, and the stirring time is 10-24 hours;

[0046] Furthermore, the amount of the catalyst dibutyltin dilaurate added in step (1) is 0.1-1 wt%, and the amount of the catalyst dibutyltin dilaurate added in step (2) is 0.02-0.2 wt%.

[0047] The application of the above self-healing polyurethane adhesive in the field of artificial turf:

[0048] The prepared encapsulated polyurethane adhesive is applied to the surface of the base fabric, and a small tuft of artificial grass yarn is placed on top and cured to obtain an artificial lawn;

[0049] Furthermore, the coating method is dispensing, and the rubber hose is continuously and evenly extruded onto the surface of the base fabric;

[0050] Furthermore, the curing methods include heat curing and moisture curing. Method 1 is to heat and cure in a hot melt adhesive manner, and method 2 is to cure the unblocked isocyanate by contact with moisture in the air;

[0051] Furthermore, moisture curing is used in the initial shaping process of artificial turf, and subsequent disassembly and reshaping requires the use of heat curing.

[0052] Compared with the prior art, the beneficial effects of the present invention are:

[0053] The present invention provides a method for synthesizing diols containing amide bonds and disulfide bonds, focusing on the purification of diols to obtain high-purity (above 97%) diols with increased dynamic covalent bond content, which can be applied to the preparation of self-healing polyurethane adhesives.

[0054] The present invention provides a method for preparing a two-component polyurethane adhesive that combines reversible dynamic covalent bonds with urea-based hydrogen bonds. The self-healing polyurethane adhesive is constructed using a non-aromatic diisocyanate as the hard segment structure, a diol and a diamine as the soft segment structure, and trimethylolpropane trimethacrylate and trimethylolpropane as crosslinkers. The adhesive exhibits high tensile strength (780%), high self-healing performance (91%), and shear strength (7.71 N / mm²), extending the service life of artificial turf and facilitating the research of disassemblyable artificial turf.

[0055] The present invention utilizes excess isocyanate groups to introduce moisture curing, thereby reducing the manufacturing cost of artificial turf and being environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The morphology of the polyurethane adhesive prepared in Example 1;

[0057] Figure 2 Self-healing mechanical property test of the polyurethane adhesive prepared in Example 2 (plot 1 and plot 5 are one group, and plot 3, plot 4 and plot 2 are one group). DETAILED DESCRIPTION

[0058] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0059] Example 1

[0060] Preparation of component A: Dissolve 12.1 g (0.05 mol) of 2,2'-dithiobis(2,1-ethylenedioxy)]diethanol, 26.7 g (0.04 mol) of isophorone diisocyanate, and 0.6 g of dibutyltin dilaurate in 60 mL of anhydrous DMF in an oil bath at 70°C. Stir at 70°C for 2 h and then at 80°C for 12 h. Protect with argon. After the reaction is complete, distill under reduced pressure at 100°C to obtain 29.5 g of component A.

[0061] Preparation of component B: In an oil bath at 60°C, 10.0 g of a mixture of polyetheramine D-400 and polyetheramine D-2000 (molar ratio 1.0:1.0), 15.0 g of PTMEG-1000, 20.0 g of isophorone diisocyanate, and 0.2 g of dibutyltin dilaurate were dissolved in 80 mL of anhydrous DMF. The mixture was stirred at 60°C for 2 h and then at 80°C for 12 h. Under argon protection, the reaction was completed and the mixture was distilled under reduced pressure at 100°C to obtain 32.9 g of component B.

[0062] Preparation process of polyurethane adhesive: Under 60℃ oil bath, 20g component A, 20g component B and 15g trimethylolpropane trimethacrylate were dissolved in 80mL anhydrous DMF, stirred at 60℃ for 2h, 80℃ for 2h, and 90℃ for 16h. Under argon protection, the reaction was completed, and vacuum distillation was performed at 100℃. The product was directly packaged by a glue potting machine to obtain about 32.0g polyurethane adhesive.

[0063] Example 2

[0064] Preparation of diols containing amide bonds and disulfide bonds: 18.712g (0.2mol) of 3-chloropropylamine and 2.04g (0.2mol) of acid-binding agent D triethylamine were dispersed in 80mL of anhydrous DMF in a three-necked flask and stirred for 50min; 10.96g (0.05mol) of 2,2'-dithiodiacetyl chloride was dispersed in 60mL of anhydrous DMF, and the solution was placed in a constant pressure dropping funnel and dripped into the above solution at -10°C under a nitrogen atmosphere for 1.5h; the experiment was stopped after 36h of reaction, and the solution was dripped into 100mL of distilled water for washing. After filtration, it was added to DMF for washing twice, filtered, and placed in a vacuum dryer. The mixture was dried in a drying oven at 60°C for 24 h to obtain 15.2 g of a light yellow product with a yield of 91.2%. 9.012 g (0.1 mol) of 1,4-butanediol was dispersed in anhydrous DMF, and 13.8 g (0.1 mol) of potassium carbonate was added. The mixture was stirred magnetically for 50 min. 15.2 g (0.045 mol) of the product and 0.03 g (0.18 mmol) of potassium iodide were weighed and added to the above solution. The mixture was stirred at 60°C for 1 h, 80°C for 1 h, and 105°C for 22 h. The mixture was condensed and refluxed. The resulting solution was dropped into ice water for precipitation, filtered, and recrystallized with n-hexane. The mixture was filtered and dried in a vacuum oven at 60°C for 24 h to obtain 13.6 g of a diol containing amide bonds and disulfide bonds.

[0065] Preparation of component A: 8.8 g (0.02 mol) of diol containing amide and disulfide bonds, 8.9 g (0.04 mol) of isophorone diisocyanate, and 0.3 g of dibutyltin dilaurate were dissolved in 50 mL of anhydrous DMF in an oil bath at 60°C. The mixture was stirred at 60°C for 2 h and then at 70°C for 12 h. Under argon protection, the reaction was completed and the mixture was distilled under reduced pressure at 90°C to obtain 10.6 g of component A.

[0066] Preparation of component B: 4.0 g of a mixture of polyetheramine D-230 and polyetheramine D-2000 (molar ratio 1.0:2.0), 10.0 g of PTMEG-1000, 15.0 g of isophorone diisocyanate, and 0.1 g of dibutyltin dilaurate were dissolved in 60 mL of anhydrous DMF in an oil bath at 60°C. The mixture was stirred at 60°C for 2 h and then at 70°C for 12 h. The mixture was protected by argon. After the reaction was complete, the mixture was distilled under reduced pressure at 90°C to obtain 16.67 g of component B.

[0067] Preparation process of polyurethane adhesive: Under 60℃ oil bath, 10g component A, 15g component B and 10g trimethylolpropane trimethacrylate were dissolved in 80mL anhydrous DMF, stirred at 60℃ for 3h, stirred at 80℃ for 15h, protected by argon, and the reaction was completed. The mixture was distilled under reduced pressure at 90℃ and directly packaged with a glue potting machine to obtain about 24.0g polyurethane adhesive.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A self-healing polyurethane artificial turf adhesive, comprising a polyurethane adhesive, characterized by: The polyurethane adhesive comprises two components, component A and component B; The component A comprises a diol containing an amide bond and a disulfide bond, a diol containing a disulfide bond, a non-aromatic diisocyanate, a catalyst dibutyltin dilaurate, and an organic solvent a; wherein the molar ratio of the diol to the diisocyanate is 1.0:1.5-4.0, and the total mass ratio of the organic solvent a to the diol and the diisocyanate is 2-10:1; The component B comprises a diamine, a diol, a diisocyanate, a catalyst dibutyltin dilaurate, and an organic solvent b; wherein the molar ratio of the diamine to the diol is 1.0:0.5-2.0, the molar ratio of the diamine and the diol to the diisocyanate is 1.0:1.5-4.0, and the total mass ratio of the organic solvent b to the diamine, diol, and diisocyanate is 2-10:1; The preparation process of the polyurethane artificial turf adhesive includes component A, component B, a crosslinking agent, and an organic solvent C. The crosslinking agent includes trimethylolpropane trimethacrylate and trimethylolpropane, the molar ratio of component A to component B is 1.0:0.2-5.0, the molar ratio of the first two to the crosslinking agent is 1.0:0.05-0.5, and the total mass ratio of the organic solvent C to the component A, component B, and the crosslinking agent is 1-5:

1. The organic solvent a, organic solvent b and organic solvent c are the same, which are one or a mixture of tetrahydrofuran, N,N-dimethylformamide, dimethyl sulfoxide and N-methylpyrrolidone.

2. The self-healing polyurethane artificial turf adhesive according to claim 1, characterized in that: The non-aromatic diisocyanate is isophorone diisocyanate or hexamethylene diisocyanate.

3. The self-healing polyurethane artificial turf adhesive according to claim 1, characterized in that: The diol containing a disulfide bond is one of 1,1'-dithiobismethanol, 2-hydroxyethyl disulfide, 1,1'-dithiobis(2-propanol), and 2,2'-[dithiobis(2,1-ethylenedioxy)]diethanol.

4. The self-healing polyurethane artificial turf adhesive according to claim 1, characterized in that: The diamine is any one of a mixture of polyetheramine D-230 and polyetheramine D-2000, or a mixture of polyetheramine D-400 and polyetheramine D-2000, wherein the molar ratio of the polyetheramine D-230 to the polyetheramine D-2000 is 1.0:0.5-10.0, and the molar ratio of the polyetheramine D-400 to the polyetheramine D-2000 is 1.0:0.5-20.

0.

5. The self-healing polyurethane artificial turf adhesive according to claim 1, characterized in that: The diol is one of polyvinyl alcohol and polytetrafluoroethylene diol with Mw of 47,000, 67,000, or 89,000.

6. The method for preparing a self-healing polyurethane artificial turf adhesive according to claim 1, characterized in that: The process for preparing the diol containing amide bonds and disulfide bonds specifically comprises the following steps: S1: Disperse monomer C and acid binding agent D in organic solvent d and stir continuously; S2: dispersing monomer E in organic solvent d; S3: Place the solution obtained in S2 in a constant pressure dropping funnel and add it dropwise to the solution obtained in S1 above under nitrogen atmosphere and stirring at low temperature; S4: After the reaction is complete, the product is washed and dried in a vacuum oven to obtain product F; S5: Dispersing monomer G in organic solvent d, adding potassium carbonate, and stirring continuously; S6: Add product F and potassium iodide to the solution described in S5, heat under reflux in an oil bath, and stir vigorously; S7: cooling precipitation, recrystallization, and vacuum oven drying to obtain a diol containing amide bonds and disulfide bonds; In step S1, the monomer C is 3-chloropropylamine, the acid-binding agent D is any one of pyridine and triethylamine, the solvent d is any one of anhydrous tetrahydrofuran, dichloromethane, ethanol, and N,N-dimethylformamide, the mass fraction of the acid-binding agent D is 0.05-0.5 wt%, and the organic solvent d is 60-110 mL; In step S2, the monomer E is 2,2'-dithiobisacetyl chloride, 3-(2-chlorocarbonyl-ethyldisulfonyl)-propionyl chloride, 4,4'-dithiobisbutyryl chloride, and 3,3'-dithiobisbutyryl chloride, the molar ratio of the monomer C to the monomer E is 3.0-5.0:1.0, and the organic solvent d is 50-80 mL; The monomer F in step S4 is a chlorine-terminated monomer containing an amide bond and a disulfide bond; In step S5, the monomer G is one of 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol and p-hydroxyphenol, the molar ratio of the product F to the monomer G is 1.0:2.0-4.0, the molar ratio of the potassium carbonate to the monomer G is 2.0-4.0:1.0, and the organic solvent d is 80-160 mL; The mass fraction of potassium iodide in step S6 is 0.02-0.1 wt %.

7. The method for preparing a self-healing polyurethane artificial turf adhesive according to claim 6, characterized in that: The synthesis process of component A and component B is as follows: (1) Dissolve a diol containing an amide bond and a disulfide bond or a diol containing a disulfide bond, a non-aromatic diisocyanate and a catalyst dibutyltin dilaurate in an organic solvent a at a temperature higher than room temperature, increase the temperature gradually, stir continuously, protect with argon, and complete the reaction, then distill under reduced pressure to obtain component A; (2) Dissolve the diamine, diol, non-aromatic diisocyanate and catalyst dibutyltin dilaurate in organic solvent B at a temperature higher than room temperature, increase the temperature gradually, stir continuously, protect with argon, complete the reaction, and perform vacuum distillation to obtain component B; (3) Component A, component B and the cross-linking agent are dissolved in an organic solvent C at a temperature higher than room temperature, the temperature is increased gradually, stirring is continued, the reaction is stopped, and vacuum distillation is performed to obtain a self-repairing polyurethane adhesive, which is directly encapsulated by a glue potting machine.

8. The method for preparing a self-healing polyurethane artificial turf adhesive according to claim 6, characterized in that: The stirring time of step S1 is 20 min-90 min, the low-temperature stirring temperature of step S3 is -30~10°C, and the stirring time is 24~72 h. The washing process is washing 2~3 times with water and the solvent used. The vacuum drying temperature of steps S3 and S7 is 55~70°C, and the time is 18~36 h. The continuous stirring time of step S5 is 30~90 min. The heating temperature of step S6 is 90-115°C, and the stirring time is 20~30 h. The precipitation method of step S7 is precipitation in crushed ice, and the recrystallization is any one of n-hexane, cyclohexane, and ethanol with a volume ratio of 1:1 with water.

9. The method for preparing a self-healing polyurethane artificial turf adhesive according to claim 7, characterized in that: The temperature range above room temperature in steps (1), (2) and (3) is 60-110°C, the gradient heating rate is 5°C / min and the temperature fluctuation range does not exceed 30°C, the amount of organic solvent used is 50-120mL, the vacuum distillation temperature is 40-120°C, the continuous stirring method in steps (1), (2) and (3) is mechanical stirring, the stirring rate is 200-1000r / min, and the stirring time is 10-24h. The amount of the catalyst dibutyltin dilaurate added in step (1) is 0.1-1wt%, and the amount of the catalyst dibutyltin dilaurate added in step (2) is 0.02-0.2wt%.

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