Polyurethane prepolymer, two-component polyurethane adhesive and preparation method thereof

Abstract

The application discloses a polyurethane prepolymer, a two-component polyurethane adhesive and a preparation method thereof. The polyurethane prepolymer is obtained by sequentially reacting diisocyanate with hydroxyl silicone oil and phosphate diol. The two-component polyurethane adhesive comprises an A component and a B component; the A component is prepared from raw materials including the polyurethane prepolymer 100 parts, an adhesion promoter 10-20 parts and an auxiliary 0.5-2 parts by weight; and the B component is prepared from raw materials including polyhydric alcohol 70-100 parts, a catalyst 0.01-0.1 parts and an auxiliary 0.1-20 parts by weight. The polyurethane adhesive has good flame retardance, good compatibility, bonding performance and mechanical strength with aerogel felt, is very suitable for coating of the aerogel felt, and can solve the problem of powder dropping of the aerogel felt in the transportation and use process while guaranteeing excellent heat insulation performance of the aerogel felt.

Description

Technical Field

[0001] This invention relates to the field of adhesive materials technology, and in particular to a polyurethane prepolymer, a two-component polyurethane adhesive, and a method for preparing the same. Background Technology

[0002] Aerogel felt, due to its advantages such as low thermal conductivity, low density, flame retardancy, heat insulation, water repellency, and long service life, is widely used for thermal insulation in industrial pipelines, storage tanks, transportation, household appliances, steel, non-ferrous metals, and glass industries, and is known as a super thermal insulation material. However, its mechanical properties are relatively poor. Introducing fibers into aerogel felt can improve its mechanical properties, but it also breaks down the aerogel, forming small particles that fill the fiber gaps. These particles are easily shed during transportation and installation, resulting in aerogel powder falling off the felt. This not only damages the thermal insulation performance of the aerogel felt but also poses a significant hazard to the health of construction workers and the environment.

[0003] Polyurethane adhesives are widely used due to their excellent bonding properties; however, due to their poor high-temperature resistance and flammability, they are difficult to apply to flame-retardant and heat-insulating composite materials. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a flame-retardant polyurethane adhesive coating material, which, when coated on the surface of aerogel felt, can enhance the mechanical properties of aerogel felt, solve the problem of powder shedding and falling off of aerogel felt, and improve the dust pollution problem of aerogel felt during storage, transportation, installation and use.

[0005] To achieve the aforementioned objectives, this invention first provides a polyurethane prepolymer. The polyurethane adhesive prepared from this prepolymer exhibits good flame retardant properties, as well as good compatibility, adhesion, and mechanical strength with aerogel mats. The technical solution includes the following:

[0006] A polyurethane prepolymer is obtained by reacting diisocyanate with hydroxyl silicone oil and phosphate diol sequentially; the structural formula of the phosphate diol is:

[0007]

[0008] Wherein, R is: C1-C6 alkyl.

[0009] In some embodiments, R is CH3 or -CH2CH3.

[0010] In some embodiments, the molar ratio of the diisocyanate, hydroxyl silicone oil, and phosphate diol is 2.5–3.5:1:0.4–0.6.

[0011] In some embodiments, the diisocyanate is selected from at least one of polymeric MDI, pure MDI, liquefied MDI, and TDI.

[0012] In some embodiments, the molecular weight of the hydroxyl silicone oil is 500 to 2000.

[0013] In some embodiments, the molecular weight of the hydroxyl silicone oil is 600 to 1500.

[0014] In some embodiments, the molecular weight of the hydroxyl silicone oil is 800 to 1200.

[0015] In some embodiments, the polyurethane prepolymer has a viscosity of 100–10000 mPa·s at 25°C and an isocyanate group content of 2–20%.

[0016] In some embodiments, the polyurethane prepolymer has a viscosity of 400–500 mPa·s at 25°C and an isocyanate group content of 15–18%.

[0017] In some embodiments, the preparation method of the phosphate diol includes the following steps: adding pentaerythritol to glycerol, heating to dehydrate and then cooling to 70°C to 75°C, then adding a mixture of polyphosphoric acid and phosphorus pentoxide, maintaining the reaction at 70°C to 75°C for 5 to 7 hours, then cooling to 58°C to 62°C, adding propylene oxide, and reacting for 2 to 3 hours to obtain the product.

[0018] In some embodiments, the phosphorus pentoxide content in the mixture of polyphosphoric acid and phosphorus pentoxide is 30 wt% to 40 wt%.

[0019] In some embodiments, the mass ratio of the mixture of polyphosphoric acid and phosphorus pentoxide, glycerol, pentaerythritol and propylene oxide is 1:2-3:0.4-0.8:6-10.

[0020] In some embodiments, the polyphosphoric acid has a molecular weight of 250 to 500.

[0021] In some embodiments, the polyphosphoric acid has a molecular weight of 300 to 400.

[0022] The present invention also provides a method for preparing the polyurethane prepolymer, comprising the following technical solutions:

[0023] A method for preparing a polyurethane prepolymer includes the following steps:

[0024] The diisocyanate and hydroxyl silicone oil are added to N,N-dimethylformamide and stirred for 3 to 5 hours under nitrogen protection and at a temperature of 60°C to 70°C. Then, the phosphate diol is added and stirred for another 3 to 5 hours at a temperature of 60°C to 70°C to remove N,N-dimethylformamide, thus obtaining the polyurethane prepolymer.

[0025] This invention also provides a two-component polyurethane adhesive, which, while possessing good flame retardant properties, exhibits good compatibility, adhesion, and mechanical strength with aerogel mats. The technical solutions include the following:

[0026] A two-component polyurethane adhesive, comprising component A and component B;

[0027] Component A, by weight, is prepared from raw materials comprising the following components:

[0028] 100 parts of the polyurethane prepolymer

[0029] 10-20 parts of adhesion promoter

[0030] 0.5 to 2 parts of auxiliary agent;

[0031] Component B, by weight, is prepared from raw materials comprising the following components:

[0032] 70-100 parts of polyols

[0033] Catalyst 0.01 to 0.1 parts

[0034] Additives: 0.1 to 20 parts.

[0035] In some embodiments, when used, the mass ratio of component A to component B is 1:0.8 to 4.

[0036] In some embodiments, the mass ratio of component A to component B is 1:1 to 2 when used.

[0037] In some embodiments, the two-component polyurethane adhesive has a mixed viscosity of 100–2000 mPa·s at 25°C.

[0038] In some embodiments, the two-component polyurethane adhesive has a mixed viscosity of 500–1500 mPa·s at 25°C.

[0039] In some embodiments, the adhesion promoter is 3-isocyanate-propyltriethoxysilane.

[0040] In some embodiments, the adhesion promoter is present in parts by weight of 15 to 20 parts.

[0041] In some embodiments, the adhesion promoter is present in parts by weight of 18 to 20 parts.

[0042] In some embodiments, the additives in component A are selected from one or more of leveling agents, antioxidants, and dehydrating agents.

[0043] In some embodiments, the auxiliary agent in component A is a dehydrating agent, and its weight is 0.8 to 1.5 parts.

[0044] In some embodiments, the dehydrating agent is a bicyclooxazolidine.

[0045] In some embodiments, the polyol is selected from at least one of polyether polyols, polyester polyols, castor oil, and polybutadiene polyols.

[0046] In some embodiments, the polyol has a viscosity of 100–10000 mPa·s at 25°C.

[0047] In some embodiments, the polyol has a viscosity of 100–5000 mPa·s at 25°C.

[0048] In some embodiments, the polyol is a combination of branched polyester polyol and hydroxyl-terminated polybutadiene polyol in a mass ratio of 5 to 7:1.

[0049] In some embodiments, the polyol is a combination of branched polyester polyol soovermol 760 and hydroxyl-terminated polybutadiene polyol Ricon 130 in a mass ratio of 6:1.

[0050] In some embodiments, the polyol is a combination of polyether polyol and castor oil in a mass ratio of 3 to 4:1.

[0051] In some embodiments, the polyol is a combination of polyether polyol DL-1000D and castor oil in a mass ratio of 7:2.

[0052] In some embodiments, the polyol is a combination of polyol LT-618 and polyether polyol in a mass ratio of 4 to 6:1.

[0053] In some embodiments, the polyol is a combination of polyol LT-618 and polyether polyol DV-125 in a mass ratio of 80:15.

[0054] In some embodiments, the catalyst is at least one of organotin catalysts (e.g., stannous octoate, dibutyltin dilaurate, etc.), organobismuth catalysts (e.g., bismuth neodecanoate, bismuth isooctanoate, etc.) and tertiary amine catalysts (e.g., triethylenediamine, triethanolamine).

[0055] In some embodiments, the amount of catalyst added is 0.01 to 0.1% of the total mass of the polyol.

[0056] In some embodiments, the auxiliaries in component B account for 1% to 5% of the total mass of the polyol.

[0057] In some embodiments, the auxiliaries in component B account for 1% to 2% of the total mass of the polyol.

[0058] In some embodiments, the additives in component B are selected from one or more mixtures of leveling agents, diluents, and dehydrating agents.

[0059] In some embodiments, the additive in component B is leveling agent 3306.

[0060] The present invention also provides a method for preparing the two-component polyurethane adhesive, including the following technical solution.

[0061] A method for preparing the two-component polyurethane adhesive includes the following steps:

[0062] Preparation of component A: The polyurethane prepolymer, adhesion promoter and additives are stirred and mixed under the conditions of temperature of 20℃~30℃ and vacuum degree of -0.09~-0.1MPa to obtain the final product;

[0063] Preparation of component B: The polyol, auxiliaries and catalyst are stirred and mixed at a temperature of 90℃~110℃ and a vacuum degree of -0.09~-0.1MPa, and then cooled to room temperature to obtain the final product.

[0064] In some embodiments, the mixing time is 1 hour to 3 hours.

[0065] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0066] This invention prepares a flame-retardant polyurethane prepolymer by reacting diisocyanate sequentially with hydroxyl silicone oil and phosphate diol. This process links phosphate flame-retardant groups to the polyurethane molecular chain, thereby improving the flame-retardant properties of the prepolymer and reducing the viscosity of the system. Furthermore, compared to traditional polyurethane prepolymers, the polyurethane prepolymer prepared in this invention contains a certain amount of organosilicon segments in its molecular chain, which effectively improves the compatibility between polyurethane resin and aerogel.

[0067] Furthermore, the two-component polyurethane adhesive prepared by combining the polyurethane prepolymer of the present invention with components such as adhesion promoters and polyols has a lower viscosity than water-based polyurethane adhesive when used for coating aerogel mats. This is beneficial for the uniform dispersion of the polyurethane adhesive on the surface of the aerogel mat, and can effectively improve its adhesion and flame retardant properties.

[0068] The two-component polyurethane adhesive of the present invention is very suitable for coating aerogel felt, which can solve the problem of powder shedding during transportation and use while ensuring the excellent thermal insulation performance of aerogel felt. Attached Figure Description

[0069] Figure 1 This is the 1H NMR spectrum of phosphate diol. Detailed Implementation

[0070] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments are merely illustrative of the present invention and should not be construed as limiting the invention.

[0071] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0072] The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or device that includes a series of steps is not limited to the steps or modules listed, but may optionally include steps not listed, or may optionally include other steps inherent to such process, method, product, or device.

[0073] In this invention, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0074] The following are specific examples.

[0075] All parts mentioned in the following examples refer to parts by weight.

[0076] Example 1: Preparation of flame-retardant polyurethane prepolymer

[0077] The reaction formula is as follows:

[0078]

[0079] Synthesis of phosphate ester diol (product 1): 30g of pentaerythritol was gradually added to 120g of glycerol. The mixture was dehydrated for 2 hours at 120℃ and a vacuum of -0.095MPa. The temperature was then lowered to 72℃, and a mixture of 50g of polyphosphoric acid (molecular weight 338) and phosphorus pentoxide (phosphorus pentoxide content 35wt%) was added. The reaction was maintained at 72℃ for 6 hours, then lowered to 60℃, and 400g of propylene oxide was added. After reacting for 2 hours, the phosphate ester diol was obtained. Its 1H NMR spectrum is shown below. Figure 1 As shown.

[0080] Synthesis of flame-retardant polyurethane prepolymer: 2.1 mol of liquefied MDI and 0.7 mol of hydroxyl silicone oil (molecular weight 1000) were added to 200 g of N,N-dimethylformamide, and the mixture was stirred at 65 °C for 4 hours under nitrogen protection. Then, 0.35 mol of the synthesized phosphate diol was added, and the mixture was stirred at 65 °C for another 4 hours. The N,N-dimethylformamide solvent was then removed by vacuum distillation to obtain the polyurethane prepolymer, which had a viscosity of 468 mPa·s at 25 °C and an isocyanate group content of 16.8%.

[0081] Example 2: Preparation of two-component polyurethane adhesive I

[0082] Component A: Weigh 100 parts of the polyurethane prepolymer prepared in Example 1, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary machine and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0083] Component B: Take 60 parts of branched polyester polyol (BASF, model Sovermol 760, viscosity 1500 mPa.s), 10 parts of hydroxyl-terminated polybutadiene polyol (Crevili Carbon Chemicals, model Ricon 130, viscosity 3200 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.01 parts of dibutyltin dilaurate catalyst, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 MPa and a temperature of 100°C, and then cool to room temperature.

[0084] Example 3: Preparation of two-component polyurethane adhesive II

[0085] Component A: Weigh 100 parts of the polyurethane prepolymer prepared in Example 1, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary machine and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0086] Component B: Take 70 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa.s), 20 parts of castor oil (Huanyu Oils Co., Ltd., premium grade, viscosity 600 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.03 parts of bismuth isooctanoate, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 MPa and a temperature of 100°C, and then cool to room temperature.

[0087] Example 4: Preparation of two-component polyurethane adhesive III

[0088] Component A: Weigh 100 parts of the polyurethane prepolymer prepared in Example 1, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary machine and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0089] Component B: Take 80 parts of polyol (Liten Company, model LT-618, viscosity 1200 mPa.s), 15 parts of polyether polyol (Lanxing Dongda Company, model DV-125, viscosity 460 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.01 parts of dibutyltin dilaurate catalyst, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 MPa and a temperature of 100°C, and then cool to room temperature.

[0090] Comparative Example 1: Preparation of Two-Component Polyurethane Adhesive VI

[0091] Component A: Weigh 100 parts of polyurethane prepolymer and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary mixer and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0092] The polyurethane prepolymer is prepared by synthesizing 100 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa.s) and 150 parts of liquefied MDI. The preparation method is as follows: 100g of DL-1000D is added to 150g of liquefied MDI and stirred for 4h at a temperature of 70℃ and a vacuum degree of -0.09 to -0.1MPa.

[0093] Component B: Take 60 parts of branched polyester polyol (BASF, model Sovermol 760, viscosity 1500 mPa.s), 10 parts of hydroxyl-terminated polybutadiene polyol (Crevili Carbon Chemicals, model Ricon 130, viscosity 3200 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.01 parts of dibutyltin dilaurate catalyst, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 and a temperature of 100°C, and then cool to room temperature.

[0094] Comparative Example 2: Preparation of Two-Component Polyurethane Adhesive V

[0095] Component A: Weigh 100 parts of polyurethane prepolymer, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary mixer and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0096] The polyurethane prepolymer is prepared by synthesizing 100 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D) and 150 parts of liquefied MDI. The preparation method is as follows: 100g of DL-1000D is added to 150g of liquefied MDI and stirred for 4h at a temperature of 70℃ and a vacuum degree of -0.09 to -0.1MPa.

[0097] Component B: Take 70 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa.s), 20 parts of castor oil (Huanyu Oils Co., Ltd., premium grade, viscosity 600 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.03 parts of bismuth isooctanoate, add them to a planetary mixer, stir for 2 hours under vacuum -0.09 to -0.1 and temperature 100℃, and then cool to room temperature.

[0098] Comparative Example 3: Preparation of Two-Component Polyurethane Adhesive VI

[0099] Component A: Weigh 100 parts of polyurethane prepolymer, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary mixer and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0100] The polyurethane prepolymer is prepared by synthesizing 100 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa.s) and 150 parts of liquefied MDI. The preparation method is as follows: 100g of DL-1000D is added to 150g of liquefied MDI and stirred for 4h at a temperature of 70℃ and a vacuum degree of -0.09 to -0.1MPa.

[0101] Component B: Take 70 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D), 20 parts of castor oil (Huanyu Oils Co., Ltd., premium grade, viscosity 600 mPa.s), 26 parts of phosphate diol (prepared in Example 1), 1 part of leveling agent (Lisheng Company, model 3306) and 0.03 parts of bismuth isooctanoate, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 MPa and a temperature of 100°C, and then cool to room temperature.

[0102] Comparative Example 4: Preparation of Two-Component Polyurethane Adhesive VII

[0103] Component A: Weigh 100 parts of polyurethane prepolymer, 20 parts of 3-isocyanate-propyltrimethoxysilane and 1 part of bicyclooxazolidine (Anxiang Elite Chemical Co., Ltd., model ALT-202) into a planetary mixer and stir for 2 hours at 25°C and a vacuum of -0.09 to -0.1 MPa.

[0104] The polyurethane prepolymer was synthesized from polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa·s), liquefied MDI, and phosphate ester diol (prepared in Example 1). The preparation method is as follows:

[0105] 300g of liquefied MDI, 200g of DL-1000D and 100g of phosphate diol (prepared in Example 1) were stirred and reacted for 4h under a vacuum of -0.09 to -0.1MPa and a temperature of 75°C to obtain a polyurethane prepolymer.

[0106] Component B: Take 70 parts of polyether polyol (Bluestar Dongda Company, model DL-1000D, viscosity 150 mPa.s), 20 parts of castor oil (Huanyu Oils Co., Ltd., premium grade, viscosity 600 mPa.s), 1 part of leveling agent (Lisheng Company, model 3306) and 0.03 parts of bismuth isooctanoate, add them to a planetary mixer, stir for 2 hours under a vacuum of -0.09 to -0.1 MPa and a temperature of 100℃, and then cool to room temperature.

[0107] Example 5 Viscosity Test

[0108] The two-component polyurethane adhesives prepared in Examples 2-4 and Comparative Examples 1-4 were tested for viscosity according to the standard GB / T 2794-2013 Determination of Viscosity of Adhesives by Single-Cylinder Rotation Viscometer. The test results are shown in Table 1.

[0109] Table 1

[0110]

[0111]

[0112] As shown in Table 1, the flame-retardant polyurethane prepolymer prepared by this invention can reduce the overall viscosity of the polyurethane adhesive, which is more conducive to the uniform dispersion of the polyurethane adhesive on the surface of the aerogel felt.

[0113] Example 6: Flame retardant performance and bond strength test

[0114] The flame retardant properties of the two-component polyurethane adhesives prepared in Examples 2-4 and Comparative Examples 1-4 were tested. The flame retardant property test standard was UL94.

[0115] The two-component polyurethane adhesives (mixed in the proportions shown in Table 1) prepared in Examples 2-4 and Comparative Examples 1-4 were tested after being applied to aerogel mats and cured, and their bonding strength was tested after curing at room temperature for 7 days.

[0116] Adhesion strength test standard: GB 7124-2008 Determination of tensile shear strength of adhesives (rigid material to rigid material).

[0117] The test results are shown in Table 2.

[0118] Table 2

[0119]

[0120]

[0121] As shown in Table 2, compared to ordinary polyurethane adhesives, the flame-retardant polyurethane prepolymer prepared in this invention improves the flame retardancy of the polyurethane adhesive by introducing phosphate diol. Simultaneously, the introduction of a certain proportion of siloxane segments improves the wettability of the polyurethane adhesive, enhances its compatibility with aerogel mats, strengthens the adhesive strength of the polyurethane adhesive, and solves the problem of powder shedding and detachment of aerogel mats. Furthermore, the added adhesion promoter also significantly improves the adhesive strength of the polyurethane adhesive.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A two-component polyurethane adhesive, characterized in that, Includes component A and component B; Component A, by weight, is prepared from raw materials comprising the following components: 100 parts of polyurethane prepolymer 10-20 parts of adhesion promoter Additives: 0.5-2 parts; Component B, by weight, is prepared from raw materials comprising the following components: 70-100 parts of polyols Catalyst 0.01~0.1 parts Additives: 0.1-20 parts; The polyurethane prepolymer is obtained by reacting diisocyanate with hydroxyl silicone oil and phosphate diol sequentially; the structural formula of the phosphate diol is: Wherein, R is: C1-C6 alkyl.

2. The two-component polyurethane adhesive according to claim 1, characterized in that, R is -CH3 or -CH2CH3.

3. The two-component polyurethane adhesive according to claim 1, characterized in that, The molar ratio of the diisocyanate, hydroxyl silicone oil and phosphate diol is 2.5~3.5:1:0.4~0.

6.

4. The two-component polyurethane adhesive according to claim 1, characterized in that, The diisocyanate is selected from at least one of polymeric MDI, pure MDI, liquefied MDI, and TDI; and / or, The molecular weight of the hydroxyl silicone oil is 500-2000.

5. The two-component polyurethane adhesive according to claim 1, characterized in that, The polyurethane prepolymer has a viscosity of 100~10000 mPa·s at 25°C and an isocyanate group content of 2~20%.

6. The two-component polyurethane adhesive according to claim 1, characterized in that, The preparation method of the phosphate diol includes the following steps: adding pentaerythritol to glycerol, heating to dehydrate and then cooling to 70℃~75℃, then adding a mixture of polyphosphoric acid and phosphorus pentoxide, maintaining the reaction at 70℃~75℃ for 5~7 hours, then cooling to 58℃~62℃, adding propylene oxide, and reacting for 2~3 hours to obtain the product.

7. The two-component polyurethane adhesive according to claim 6, characterized in that, The mixture of polyphosphoric acid and phosphorus pentoxide contains 30 wt% to 40 wt% phosphorus pentoxide; and / or, The mass ratio of the mixture of polyphosphoric acid and phosphorus pentoxide, glycerol, pentaerythritol, and propylene oxide is 1:2~3:0.4~0.8:6~10; and / or, The molecular weight of the polyphosphoric acid is 250-500.

8. The two-component polyurethane adhesive according to any one of claims 1-7, characterized in that, The method for preparing the polyurethane prepolymer includes the following steps: The diisocyanate and hydroxyl silicone oil are added to N,N-dimethylformamide and stirred for 3-5 hours under nitrogen protection and at a temperature of 60℃~70℃. Then, the phosphate diol is added and stirred for another 3-5 hours at a temperature of 60℃~70℃ to remove N,N-dimethylformamide, thus obtaining the polyurethane prepolymer.

9. The two-component polyurethane adhesive according to any one of claims 1-7, characterized in that, When used, the mixing mass ratio of component A and component B is 1:0.8~4; and / or, The two-component polyurethane adhesive has a mixing viscosity of 100~2000 mPa·s at 25°C; and / or, The adhesion promoter is 3-isocyanate-propyltriethoxysilane; and / or The additives in component A are selected from one or more of leveling agents, antioxidants, and dehydrating agents; and / or, The polyol is selected from at least one of polyether polyols, polyester polyols, castor oil, and polybutadiene polyols; and / or, The catalyst is at least one selected from organotin catalysts, organobismuth catalysts, and tertiary amine catalysts; and / or, The additives in component B are selected from one or more of leveling agents, diluents, and dehydrating agents.

10. A method for preparing a two-component polyurethane adhesive according to any one of claims 1-9, characterized in that, Includes the following steps: Preparation of component A: The polyurethane prepolymer, adhesion promoter and additives are stirred and mixed under the conditions of temperature of 20℃~30℃ and vacuum degree of -0.09~-0.1MPa to obtain the final product; Preparation of component B: The polyol, auxiliaries and catalyst are stirred and mixed at a temperature of 90℃~110℃ and a vacuum degree of -0.09~-0.1MPa, and then cooled to room temperature to obtain the final product.

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