Polyurethane lawn adhesive and preparation method thereof

Abstract

The invention relates to the field of lawn adhesives, in particular to a polyurethane lawn adhesive and a preparation method thereof, which are used for solving the problems that the existing lawn adhesive is slow in curing speed, low in adhesive strength and easy to be eroded by light, heat and oxygen, so that the performance of the lawn adhesive is greatly reduced. The polyurethane lawn adhesive is simple, convenient and rapid to construct, can firmly adhere an artificial lawn to the surface of a base layer in practical application, effectively prevents the lawn from warping and falling off, ensures the laying quality and the service life of the artificial lawn, has excellent temperature resistance and waterproof performance by using fluorine-containing modified castor oil, and is suitable for popularization and application. The modified nano calcium carbonate is utilized to enable the lawn adhesive to have excellent mechanical properties, so that the lawn adhesive can effectively resist the influence of severe environments such as high temperature and humidity on the lawn adhesive, the lawn adhesive has excellent adhesive property, and the service life of a lawn is effectively prolonged.

Description

Technical Field

[0001] The invention relates to the field of lawn adhesives, and in particular to a polyurethane lawn adhesive and a preparation method thereof. Background Art

[0002] Artificial turf is increasingly used in modern sports venue construction and urban landscape decoration. Whether it is professional football fields, tennis courts and other sports venues, or landscape areas such as urban parks and rooftop greening, artificial turf has gradually become people's first choice due to its advantages such as beauty, durability and easy maintenance. However, the laying effect and service life of artificial turf depend largely on the performance of the adhesive used.

[0003] There are many problems with existing lawn adhesive products. Some adhesives cure slowly, and it takes a long time to put them into use after construction, which not only prolongs the construction period, but also increases the construction cost. The bonding strength of some products is insufficient. When affected by factors such as rain erosion, frequent trampling by people, or temperature changes, artificial turf is prone to warping and falling off, which seriously affects the use effect and aesthetics of the lawn. In addition, many lawn adhesives have poor weather resistance. Under the influence of natural environments such as ultraviolet rays, high temperature, and humidity, they are prone to aging and deterioration, resulting in a decrease in bonding performance and shortening the service life of artificial turf.

[0004] Therefore, it is of great practical significance to develop a polyurethane lawn adhesive with fast curing speed, high bonding strength and good weather resistance and a preparation method thereof. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a polyurethane lawn adhesive and a preparation method thereof, which solves the problems that the existing lawn adhesive has a slow curing speed, low bonding strength and is easily corroded by light, heat and oxygen, resulting in a significant decrease in the performance of the lawn adhesive.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A polyurethane lawn adhesive comprises: a component A and a component B; The mass ratio of component A to component B is 1:8; Wherein, the A component comprises the following components in parts by weight: 30-40 parts of xylene diisocyanate, 60-70 parts of polymethylene polyphenyl polyisocyanate; Wherein, the B component comprises the following components in parts by weight: 20-30 parts of fluorine-containing modified castor oil, 5-9 parts of dioctyl terephthalate, 70-80 parts of modified nano calcium carbonate, 3-5 parts of zeolite molecular sieve and 1-2 parts of diethylene glycol.

[0007] As a further embodiment of the present invention: the fluorine-containing modified castor oil is prepared by the following steps: Step a1: adding hexafluoroisopropanol, mercaptopropionic acid, p-toluenesulfonic acid and chloroform into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introducing nitrogen for protection, and then stirring the reaction at a temperature of 25-30° C. and a stirring rate of 300-400 r / min for 1-2 hours, and then heating to 80-90° C. and stirring the reaction for 4-5 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with sodium hydroxide solution, and then allowed to stand for stratification, and the organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step a2: Castor oil, fluorinated mercaptan modifier, benzoin dimethyl ether and anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. The reaction is then stirred for 40-50 hours at a temperature of 0-5°C, a stirring rate of 300-400 r / min and 365nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed with a saturated sodium chloride solution for 2-3 times, and then allowed to stand for stratification. The organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered. The filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil.

[0008] As a further solution of the present invention: the usage ratio of the hexafluoroisopropanol, mercaptopropionic acid, p-toluenesulfonic acid and chloroform in step a1 is 10 mmol: 10 mmol: 0.05-0.09 g: 50-60 mL.

[0009] As a further solution of the present invention: the mass fraction of the sodium hydroxide solution in step a1 is 5-7%.

[0010] As a further solution of the present invention: the usage ratio of the castor oil, the fluorinated mercaptan modifier, benzoin dimethyl ether and anhydrous acetone in step a2 is 10 mmol: 30 mmol: 0.1-0.3 g: 100-120 mL.

[0011] As a further solution of the present invention: the modified nano calcium carbonate is prepared by the following steps: Add nano calcium carbonate and N, N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, perform ultrasonic treatment for 30-40 minutes under the condition of ultrasonic power of 200-300W, introduce nitrogen protection, then add tartaric acid and stir the reaction for 1-2 hours at a temperature of 25-30°C and a stirring rate of 300-400r / min, then heat the temperature to 130-150°C and stir the reaction for 8-10 hours, after the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with anhydrous ethanol and distilled water for 3-5 times in sequence, then place it in a vacuum drying oven, dry it at a temperature of 60-65°C for 2-3 hours, and then pass it through a 400-mesh sieve to obtain modified nano calcium carbonate.

[0012] As a further solution of the present invention: the usage ratio of the nano-calcium carbonate, N,N-dimethylformamide and tartaric acid is 1g:30-35mL:0.3-0.7g.

[0013] As a further solution of the present invention: a method for preparing a polyurethane lawn adhesive comprises the following steps: Step 1: Weigh 30-40 parts of xylene diisocyanate and 60-70 parts of polymethylene polyphenyl polyisocyanate according to weight parts and set aside; Step 2: Add dimethylbenzene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stir and react for 30-50 minutes at a temperature of 50-80° C. and a stirring rate of 300-400 r / min to obtain component A; Step 3: Weigh 20-30 parts of fluorine-containing modified castor oil, 5-9 parts of dioctyl terephthalate, 70-80 parts of modified nano calcium carbonate, 3-5 parts of zeolite molecular sieve and 1-2 parts of diethylene glycol according to weight parts, and set aside; Step 4: adding fluorinated modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 1-2 hours at a temperature of 100-110° C. and a stirring rate of 300-400 r / min to obtain component B; Step 5: When using, mix component A and component B in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0014] Beneficial effects of the present invention: The invention discloses a polyurethane lawn adhesive and a preparation method thereof. The method comprises the following steps: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle for stirring and reacting to obtain component A; adding fluorine-containing modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into the reaction kettle for stirring and reacting to obtain component B; and stirring and mixing component A and component B to obtain the polyurethane lawn adhesive. The preparation method utilizes that the xylene diisocyanate and polymethylene polyphenyl polyisocyanate in component A have high reactivity and can react chemically with the fluorine-containing modified castor oil, modified nano calcium carbonate and diethylene glycol in component B to form component B. Strong chemical bonds can improve the bonding strength of the lawn adhesive. In practical applications, the artificial lawn can be firmly bonded to the surface of the base layer, effectively preventing the lawn from warping and falling off, ensuring the laying quality and service life of the artificial lawn. The fluorine-containing modified castor oil is used to make it have excellent heat resistance and waterproof properties, and the modified nano calcium carbonate is used to make it have excellent mechanical properties, so that the lawn adhesive can effectively resist the influence of high temperature, humidity and other harsh environments on the lawn adhesive, so that it has excellent bonding properties and effectively prolongs the service life of the lawn. Moreover, when the polyurethane lawn adhesive is used, it only needs to mix and stir the A component and the B component, and the construction is simple and quick. In the preparation of polyurethane lawn adhesive, a fluorine-modified castor oil is first prepared, and hexafluoroisopropanol and mercaptopropionic acid are reacted, and the hydroxyl group on the hexafluoroisopropanol reacts with the carboxyl group on the mercaptopropionic acid to form a fluorine-containing thiol modifier containing a thiol group and a large number of fluorine atoms. Then, castor oil and the fluorine-containing thiol modifier are reacted, and the alkenyl group on the castor oil and the thiol group on the fluorine-containing thiol modifier undergo a click chemical reaction, thereby introducing a large number of fluorine atoms into the castor oil to obtain the fluorine-modified castor oil. Castor oil itself is a natural oil with dual benefits of economy and environmental protection. It also contains multiple hydroxyl groups, so that it can react with the isocyanate group in component A to form an urethane bond to form polyurethane. The use of the fluorine-modified castor oil introduces a large number of fluorine atoms into the polyurethane, which gives the lawn adhesive good water resistance and Oil resistance: it is difficult for water and oil to adhere to and penetrate the surface of the adhesive layer. At the same time, the presence of fluorine atoms enhances the stability of the molecular structure and can effectively resist the erosion of light, heat and oxygen, thereby improving the weather resistance of the turf adhesive. In the preparation of polyurethane turf adhesive, a modified nano-calcium carbonate is first prepared, and the nano-calcium carbonate is modified using tartaric acid. Tartaric acid contains two hydroxyl groups and a carboxyl group. The carboxyl group can chemically bond with the surface group of the nano-calcium carbonate, thereby greatly improving the dispersibility of the nano-calcium carbonate, so that it can be evenly distributed in the turf adhesive. In addition, the introduced hydroxyl group can react with the isocyanate group in component A, so that it can be distributed in the turf adhesive in the form of a chemical bond, and can be fully filled in the gaps between the polyurethane molecular chains, thereby greatly improving the mechanical properties of the turf adhesive. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Embodiment 1, this embodiment is a preparation method of polyurethane lawn adhesive, comprising the following steps: Step S1: 10 mmol hexafluoroisopropanol, 10 mmol mercaptopropionic acid, 0.05 g p-toluenesulfonic acid and 50 mL chloroform are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. Then, the reaction is stirred at a temperature of 25° C. and a stirring rate of 300 r / min for 1 hour, and then the temperature is raised to 80° C. and the reaction is stirred for 4 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with a 5% sodium hydroxide solution, and then allowed to stand for stratification. The organic phase is washed 3 times with distilled water, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step S2: 10 mmol castor oil, 30 mmol fluorinated thiol modifier, 0.1 g benzoin dimethyl ether and 100 mL anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. Then, the reaction is stirred for 40 hours at a temperature of 0° C., a stirring rate of 300 r / min and 365 nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed twice with a saturated sodium chloride solution, and then allowed to stand for stratification. The organic phase is washed three times with distilled water, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil; Step S3: 1 g of nano calcium carbonate and 30 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and ultrasonically treated for 30 min at an ultrasonic power of 200 W, and nitrogen protection was introduced, and then 0.3 g of tartaric acid was added and stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 1 h, and then the temperature was raised to 130° C. and stirred for reaction for 8 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol and distilled water for 3 times in sequence, and then placed in a vacuum drying oven, dried at a temperature of 60° C. for 2 h, and then passed through a 400-mesh sieve to obtain modified nano calcium carbonate; Step S4: weigh 30 parts of xylene diisocyanate and 60 parts of polymethylene polyphenyl polyisocyanate according to weight parts for later use; Step S5: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 30 minutes at a temperature of 50° C. and a stirring rate of 300 r / min to obtain component A; Step S6: weigh 20 parts of fluorine-containing modified castor oil, 5 parts of dioctyl terephthalate, 70 parts of modified nano calcium carbonate, 3 parts of zeolite molecular sieve and 1 part of diethylene glycol according to weight parts for later use; Step S7: adding fluorine-containing modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 1 hour at a temperature of 100° C. and a stirring rate of 300 r / min to obtain component B; Step S8: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0017] Embodiment 2, this embodiment is a preparation method of a polyurethane lawn adhesive, comprising the following steps: Step S1: 10 mmol hexafluoroisopropanol, 10 mmol mercaptopropionic acid, 0.07 g p-toluenesulfonic acid and 55 mL chloroform are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. Then, the reaction is stirred at a temperature of 28° C. and a stirring rate of 350 r / min for 1.5 h, and then the temperature is raised to 85° C. and the reaction is stirred for 4.5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with a 6% sodium hydroxide solution, and then allowed to stand for stratification. The organic phase is washed 4 times with distilled water, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step S2: 10 mmol castor oil, 30 mmol fluorinated mercaptan modifier, 0.2 g benzoin dimethyl ether and 110 mL anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. Then, the reaction is stirred for 45 hours at a temperature of 3° C., a stirring rate of 350 r / min and 365 nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed twice with a saturated sodium chloride solution, and then allowed to stand for stratification. The organic phase is washed four times with distilled water, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil; Step S3: 1 g of nano calcium carbonate and 32 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and ultrasonically treated for 35 min at an ultrasonic power of 250 W, and nitrogen protection was introduced. Then, 0.5 g of tartaric acid was added and stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 1.5 h, and then the temperature was raised to 140° C. and stirred for reaction for 9 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol and distilled water for 4 times in sequence, and then placed in a vacuum drying oven, dried at a temperature of 62° C. for 2.5 h, and then passed through a 400-mesh sieve to obtain modified nano calcium carbonate; Step S4: weigh 35 parts of xylene diisocyanate and 65 parts of polymethylene polyphenyl polyisocyanate according to weight and set aside; Step S5: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 40 minutes at a temperature of 65° C. and a stirring rate of 350 r / min to obtain component A; Step S6: weigh 25 parts of fluorine-containing modified castor oil, 7 parts of dioctyl terephthalate, 75 parts of modified nano-calcium carbonate, 4 parts of zeolite molecular sieve and 1.5 parts of diethylene glycol according to weight parts for later use; Step S7: adding fluorine-containing modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 1.5 hours at a temperature of 105° C. and a stirring rate of 350 r / min to obtain component B; Step S8: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0018] Embodiment 3, this embodiment is a method for preparing a polyurethane lawn adhesive, comprising the following steps: Step S1: 10 mmol hexafluoroisopropanol, 10 mmol mercaptopropionic acid, 0.09 g p-toluenesulfonic acid and 60 mL chloroform are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. Then, the reaction is stirred at a temperature of 30° C. and a stirring rate of 400 r / min for 2 h, and then the temperature is raised to 90° C. and the reaction is stirred for 5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with a 7% sodium hydroxide solution, and then allowed to stand for stratification. The organic phase is washed with distilled water 5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step S2: 10 mmol castor oil, 30 mmol fluorinated thiol modifier, 0.3 g benzoin dimethyl ether and 120 mL anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. Then, the reaction is stirred for 50 hours at a temperature of 5° C., a stirring rate of 400 r / min and 365 nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed with a saturated sodium chloride solution for 3 times, and then allowed to stand for stratification. The organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil; Step S3: 1 g of nano calcium carbonate and 35 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and ultrasonically treated for 40 min at an ultrasonic power of 300 W, and nitrogen was introduced for protection. Then, 0.7 g of tartaric acid was added and stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 2 h, and then the temperature was raised to 150° C. and stirred for reaction for 10 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol and distilled water for 5 times in sequence, and then placed in a vacuum drying oven, dried at a temperature of 65° C. for 3 h, and then passed through a 400-mesh sieve to obtain modified nano calcium carbonate; Step S4: Weigh 40 parts of xylene diisocyanate and 70 parts of polymethylene polyphenyl polyisocyanate according to weight and set aside; Step S5: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 50 minutes at a temperature of 80° C. and a stirring rate of 400 r / min to obtain component A; Step S6: weigh 30 parts of fluorine-containing modified castor oil, 9 parts of dioctyl terephthalate, 80 parts of modified nano calcium carbonate, 5 parts of zeolite molecular sieve and 2 parts of diethylene glycol according to weight parts for later use; Step S7: adding fluorine-containing modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 2 hours at a temperature of 110° C. and a stirring rate of 400 r / min to obtain component B; Step S8: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0019] Comparative Example 1: This comparative example is a method for preparing a polyurethane lawn adhesive, comprising the following steps: Step S1: weigh 40 parts of xylene diisocyanate and 70 parts of polymethylene polyphenyl polyisocyanate according to weight and set aside; Step S2: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 50 minutes at a temperature of 80° C. and a stirring rate of 400 r / min to obtain component A; Step S3: weigh 30 parts of castor oil, 9 parts of dioctyl terephthalate, 80 parts of nano calcium carbonate, 5 parts of zeolite molecular sieve and 2 parts of diethylene glycol according to weight parts, and set aside; Step S4: adding castor oil, dioctyl terephthalate, nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 2 hours at a temperature of 110° C. and a stirring rate of 400 r / min to obtain component B; Step S5: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0020] Comparative Example 2: This comparative example is a method for preparing a polyurethane lawn adhesive, comprising the following steps: Step S1: 10 mmol hexafluoroisopropanol, 10 mmol mercaptopropionic acid, 0.09 g p-toluenesulfonic acid and 60 mL chloroform are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. Then, the reaction is stirred at a temperature of 30° C. and a stirring rate of 400 r / min for 2 h, and then the temperature is raised to 90° C. and the reaction is stirred for 5 h. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with a 7% sodium hydroxide solution, and then allowed to stand for stratification. The organic phase is washed with distilled water 5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step S2: 10 mmol castor oil, 30 mmol fluorinated thiol modifier, 0.3 g benzoin dimethyl ether and 120 mL anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. Then, the reaction is stirred for 50 hours at a temperature of 5° C., a stirring rate of 400 r / min and 365 nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed with a saturated sodium chloride solution for 3 times, and then allowed to stand for stratification. The organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil; Step S3: Weigh 40 parts of xylene diisocyanate and 70 parts of polymethylene polyphenyl polyisocyanate according to weight and set aside; Step S4: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 50 minutes at a temperature of 80° C. and a stirring rate of 400 r / min to obtain component A; Step S5: weigh 30 parts of fluorine-containing modified castor oil, 9 parts of dioctyl terephthalate, 80 parts of nano calcium carbonate, 5 parts of zeolite molecular sieve and 2 parts of diethylene glycol according to weight parts for later use; Step S6: adding fluorine-containing modified castor oil, dioctyl terephthalate, nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 2 hours at a temperature of 110° C. and a stirring rate of 400 r / min to obtain component B; Step S7: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0021] Comparative Example 3: This comparative example is a method for preparing a polyurethane lawn adhesive, comprising the following steps: Step S1: 1 g of nano calcium carbonate and 35 mL of N,N-dimethylformamide are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and ultrasonically treated for 40 min at an ultrasonic power of 300 W, and nitrogen protection is introduced, and then 0.7 g of tartaric acid is added and stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 2 h, and then the temperature is raised to 150° C. and stirred for reaction for 10 h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with anhydrous ethanol and distilled water for 5 times in sequence, and then placed in a vacuum drying oven, dried at a temperature of 65° C. for 3 h, and then passed through a 400-mesh sieve to obtain modified nano calcium carbonate; Step S2: Weigh 40 parts of xylene diisocyanate and 70 parts of polymethylene polyphenyl polyisocyanate according to weight and set aside; Step S3: adding xylene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stirring and reacting for 50 minutes at a temperature of 80° C. and a stirring rate of 400 r / min to obtain component A; Step S4: weigh 30 parts of castor oil, 9 parts of dioctyl terephthalate, 80 parts of modified nano calcium carbonate, 5 parts of zeolite molecular sieve and 2 parts of diethylene glycol according to weight parts, and set aside; Step S5: adding castor oil, dioctyl terephthalate, modified nano-calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 2 hours at a temperature of 110° C. and a stirring rate of 400 r / min to obtain component B; Step S6: When in use, component A and component B are stirred and mixed evenly in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

[0022] The polyurethane turf adhesives of Examples 1-3 and Comparative Examples 1-3 were respectively scraped onto Hexin Kuraray microfiber leather with a scraping thickness of 0.1 mm, and then laminated with a rubber roller at 5 kg pressure and 60°C. The peel strengths after being placed at 25°C for 10 minutes, the peel strength after being placed at 25°C for 24 hours, the peel strength after being placed at 120°C for 24 hours, the peel strength after being soaked in 25°C deionized water for 24 hours after being placed at 25°C for 24 hours, and the peel strength after being soaked in 80°C deionized water for 24 hours after being placed at 25°C for 24 hours were tested.

[0023] The test results are shown in the following table:

[0024] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be known that the polyurethane lawn adhesive of the present application has excellent bonding properties and still has good bonding properties in high temperature and humid environments.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. A polyurethane lawn adhesive, characterized in that: include: Component A and component B; The mass ratio of component A to component B is 1:8; Wherein, the A component comprises the following components in parts by weight: 30-40 parts of xylene diisocyanate, 60-70 parts of polymethylene polyphenyl polyisocyanate; Wherein, the B component comprises the following components in parts by weight: 20-30 parts of fluorine-containing modified castor oil, 5-9 parts of dioctyl terephthalate, 70-80 parts of modified nano calcium carbonate, 3-5 parts of zeolite molecular sieve and 1-2 parts of diethylene glycol.

2. A polyurethane lawn adhesive according to claim 1, characterized in that: The fluorine-containing modified castor oil is prepared by the following steps: Step a1: adding hexafluoroisopropanol, mercaptopropionic acid, p-toluenesulfonic acid and chloroform into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introducing nitrogen for protection, and then stirring the reaction at a temperature of 25-30° C. and a stirring rate of 300-400 r / min for 1-2 hours, and then heating to 80-90° C. and stirring the reaction for 4-5 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then adjusted to pH 7 with sodium hydroxide solution, and then allowed to stand for stratification, and the organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a fluorine-containing thiol modifier; Step a2: Castor oil, fluorinated mercaptan modifier, benzoin dimethyl ether and anhydrous acetone are added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen is introduced for protection. The reaction is then stirred for 40-50 hours at a temperature of 0-5°C, a stirring rate of 300-400 r / min and 365nm ultraviolet irradiation. After the reaction is completed, the reaction product is added to ethyl acetate, and then washed with a saturated sodium chloride solution for 2-3 times, and then allowed to stand for stratification. The organic phase is washed with distilled water for 3-5 times, and then dried with anhydrous sodium sulfate, and then vacuum filtered. The filtrate is rotary evaporated to remove the solvent to obtain fluorinated modified castor oil.

3. A polyurethane lawn adhesive according to claim 2, characterized in that: The usage ratio of the hexafluoroisopropanol, mercaptopropionic acid, p-toluenesulfonic acid and chloroform in step a1 is 10 mmol: 10 mmol: 0.05-0.09 g: 50-60 mL.

4. A polyurethane lawn adhesive according to claim 2, characterized in that: The mass fraction of the sodium hydroxide solution in step a1 is 5-7%.

5. The polyurethane lawn adhesive according to claim 2, characterized in that: The usage ratio of the castor oil, the fluorinated mercaptan modifier, benzoin dimethyl ether and anhydrous acetone in step a2 is 10 mmol: 30 mmol: 0.1-0.3 g: 100-120 mL.

6. The polyurethane lawn adhesive according to claim 1, characterized in that: The modified nano calcium carbonate is prepared by the following steps: Add nano calcium carbonate and N, N-dimethylformamide into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, perform ultrasonic treatment for 30-40 minutes under the condition of ultrasonic power of 200-300W, introduce nitrogen protection, then add tartaric acid and stir the reaction for 1-2 hours at a temperature of 25-30°C and a stirring rate of 300-400r / min, then heat the temperature to 130-150°C and stir the reaction for 8-10 hours, after the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with anhydrous ethanol and distilled water for 3-5 times in sequence, then place it in a vacuum drying oven, dry it at a temperature of 60-65°C for 2-3 hours, and then pass it through a 400-mesh sieve to obtain modified nano calcium carbonate.

7. The polyurethane lawn adhesive according to claim 6, characterized in that: The dosage ratio of the nano calcium carbonate, N,N-dimethylformamide and tartaric acid is 1g:30-35mL:0.3-0.7g.

8. A method for preparing the polyurethane lawn adhesive according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Weigh 30-40 parts of xylene diisocyanate and 60-70 parts of polymethylene polyphenyl polyisocyanate according to weight parts and set aside; Step 2: Add dimethylbenzene diisocyanate and polymethylene polyphenyl polyisocyanate into a reaction kettle, stir and react for 30-50 minutes at a temperature of 50-80° C. and a stirring rate of 300-400 r / min to obtain component A; Step 3: Weigh 20-30 parts of fluorine-containing modified castor oil, 5-9 parts of dioctyl terephthalate, 70-80 parts of modified nano calcium carbonate, 3-5 parts of zeolite molecular sieve and 1-2 parts of diethylene glycol according to weight parts, and set aside; Step 4: adding fluorinated modified castor oil, dioctyl terephthalate, modified nano calcium carbonate, zeolite molecular sieve and diethylene glycol into a reaction kettle, stirring and reacting for 1-2 hours at a temperature of 100-110° C. and a stirring rate of 300-400 r / min to obtain component B; Step 5: When using, mix component A and component B in a mass ratio of 1:8 to obtain a polyurethane lawn adhesive.

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