Low-density floating-resistant polyurethane runway material and preparation method thereof

Abstract

The invention belongs to the technical field of polyurethane, and particularly relates to a low-density floating-resistant polyurethane runway material and a preparation method thereof. The polyurethane runway material is prepared from a component A and a component B, wherein the component A is prepared from the following raw materials: polyether polyol, polymer polyol, filler, modified hollow glass beads, a polyurea thickening agent, a catalyst, a silane coupling agent, a dispersing agent, a defoaming agent, an ultraviolet absorbent, an antioxidant and pigment; and the component B comprises the following raw materials: isocyanate, polyether polyol 2 and polyether polyol 3. By introducing the modified hollow glass beads and combining a low-damage mechanism, the density of the polyurethane runway material is remarkably reduced, the overall weight is reduced, meanwhile, the material cost is reduced by means of the volume effect, and the basic performance and stability of the material are guaranteed; by constructing a quintuple floating inhibition system, the floating problem of the hollow glass beads in a liquid material and in a curing process is effectively solved, and the product uniformity is improved.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane technology, specifically relating to low-density, buoyancy-resistant polyurethane runway materials and their preparation methods. Background Technology

[0002] Polyurethane running track materials have been widely used due to their excellent wear resistance, chemical corrosion resistance, and controllable mechanical properties. However, traditional polyurethane running track materials suffer from problems such as high density and high viscosity. Currently, there are two main methods to reduce the density of polyurethane: one is the chemical foaming method, which involves introducing a foaming agent to form a closed-cell or open-cell structure, but this method suffers from uneven cell distribution and a significant decrease in mechanical strength; the other is the physical filling method, which involves adding lightweight fillers such as hollow polymer microspheres and expanded perlite, but these fillers are prone to cracking during high-speed mixing and have poor interfacial bonding with the polyurethane matrix, easily leading to floating and a decrease in the toughness of the composite material. Currently, physically filled hollow glass microspheres (density 0.2~0.6 g / cm³) are being developed. 3 While theoretically effective in reducing system density, this method still faces technical challenges in practical applications. One issue is dispersion: the smooth surface of glass microspheres leads to poor compatibility with liquid polyurethane materials, and conventional high-speed stirring easily damages the microsphere structure, limiting the density reduction effect. Another issue is buoyancy: a significant density difference exists between glass microspheres and liquid polyurethane materials, causing them to float due to gravity during static storage, affecting the uniformity of the final product. Therefore, it is necessary to develop a two-component, low-density, buoyancy-resistant polyurethane running track material to address these problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a low-density, float-resistant polyurethane running track material. By introducing modified hollow glass microspheres and combining them with a low-damage mechanism, the density of the polyurethane running track material is significantly reduced, the overall weight is lightened, and the material cost is reduced by leveraging the volume effect, while ensuring the basic performance and stability of the material. By constructing a five-fold anti-buoyancy system, the floating problem of hollow glass microspheres in liquid materials and during the curing process is effectively solved, thereby improving product uniformity. Another objective of this invention is to provide a method for preparing a low-density, buoyancy-resistant polyurethane runway material. By rationally combining materials and controlling reactivity, the method balances the workability and post-curing performance of the material while ensuring system dispersibility and low damage. It combines performance advantages with process feasibility and is suitable for industrial production.

[0004] The technical solution adopted in this invention is as follows: The aforementioned low-density, buoyancy-resistant polyurethane runway material is made from component A and component B in a mass ratio of (4~5.5):1, wherein component A comprises the following raw materials by mass percentage: Polyether polyol 1: 40~55%; Polymer polyols: 8~15%; Filler: 20~35%; Modified hollow glass microspheres: 3~8%; Polyurea thickener: 0.8~1.5%; Catalyst: 0.3~1.5%; Coupling agent: 1~2%; Dispersant: 0.4~1.2%; Defoamer: 0.2~0.6%; UV absorber: 0.3~1%; Antioxidant: 0.1~0.5%; Pigment: 2-5%; Component B comprises the following raw materials by mass percentage: Isocyanate: 70~80%; Polyether polyol 2: 10~16%; Polyether polyol 3: 7~20%; The polyether polyol 1 has a functionality of 2 to 3 and a number-average molecular weight of 2000 to 4000. It is preferably DL-4000D produced by Shandong Lanxing Dongda Co., Ltd., which has low unsaturation. The polyether polyol 2 has a functionality of 2 and a hydroxyl value of 54.5~57.5 mgKOH / g, and is preferably C220 produced by Shandong Yinuowei New Materials Co., Ltd. The polyether polyol 3 has a functionality of 3 and a hydroxyl value of 54.5~57.5 mgKOH / g, and is preferably C3050A produced by Shandong Yinuowei New Material Co., Ltd.

[0005] The modified hollow glass microspheres are hollow glass microspheres that have undergone surface treatment with a silane coupling agent alcohol solution.

[0006] The polymer polyol is a styrene-acrylonitrile copolymer, preferably EP903 produced by China Petroleum & Chemical Corporation; the filler is heavy calcium carbonate with a particle size of 400 mesh and a density of 2.9 g / cm³. 3 Purchased from Jiangxi Guangyuan Chemical Co., Ltd.

[0007] The method for preparing the modified hollow glass microspheres includes the following steps: A silane coupling agent was dissolved in an alcohol solvent to prepare a silane coupling agent alcohol solution. Hollow glass microspheres were sprayed with the silane coupling agent alcohol solution and then dried and cured at 60~80℃ to obtain modified hollow glass microspheres.

[0008] The hollow glass microspheres are preferably GS40 produced by China Steel Group Maanshan Mining Research Institute New Materials Technology Co., Ltd.

[0009] The concentration of the silane coupling agent alcohol solution is 1~3 wt.%, and the silane coupling agent in the silane coupling agent alcohol solution is preferably γ-aminopropyltriethoxysilane, and the alcohol is preferably ethanol; The modified hollow glass microspheres obtained have a compressive strength ≥28MPa, a particle size of 50±2μm, and a density of 0.4±0.02g / cm³. 3 The breakage rate is less than 3%.

[0010] The polyurea thickener is an amino-terminated polyether compound, preferably LHD-123 from Shandong Longhua New Material Co., Ltd.

[0011] The catalyst is an organic bismuth / zinc composite catalyst, preferably CUCAT-S01 produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

[0012] The coupling agent is γ-aminopropyltriethoxysilane.

[0013] The dispersant is a nonionic polymeric dispersant, preferably DISPERBYK-111 produced by BYK Chemicals in Germany.

[0014] The defoamer is an organosilicon defoamer, preferably TEGO Airex 900 manufactured by Evonik Industries.

[0015] The ultraviolet absorber is a benzotriazole ultraviolet absorber, preferably Tinuvin 329 manufactured by BASF in Germany.

[0016] The antioxidant is a hindered phenolic antioxidant, preferably Irganox 1010 manufactured by BASF in Germany.

[0017] The pigment is preferably iron oxide red.

[0018] The isocyanate is MDI, preferably MDI-50 produced by Wanhua Chemical Group Co., Ltd.

[0019] The preparation method of the low-density, buoyancy-resistant polyurethane runway material includes the following steps: (1) Add polyether polyol 1, polymer polyol, first part defoamer and dispersant into the reactor, heat to 55~65℃, add filler, ultraviolet absorber, antioxidant and pigment, disperse evenly and then add coupling agent and first part polyurea thickener, keep warm and stir at 55~65℃ for 60~90min, then evacuate to pressure ≤-0.07MPa, add modified hollow glass microspheres and remaining defoamer at stirring speed ≤500rpm, then add remaining polyurea thickener, cool to below 60℃, add catalyst, stir for 40~60min to obtain component A; (2) Isocyanate, polyether polyol 2 and polyether polyol 3 are added to the reaction vessel, heated to 80~85℃, and kept at the temperature for 1.5~2h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

[0020] The amount of the first part of the defoamer is 40-60 wt.% of the total amount of defoamer; the amount of the first part of the polyurea thickener is 40-60 wt.% of the total amount of polyurea thickener.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The low-density, buoyancy-resistant polyurethane runway material of the present invention reduces the overall weight of the runway material by introducing modified hollow glass microspheres, and reduces the material cost through volume effect; at the same time, by controlling the amount of modified hollow glass microspheres added, a balance between material performance and stability is achieved while ensuring the low density of the material. (2) The present invention constructs a five-fold buoyancy suppression system to reduce the buoyancy rate of hollow glass microspheres. First, after modification with an aminosilane coupling agent, hollow glass microspheres form a Si-O-Si covalent bond structure on their surface, balancing their buoyancy in component A through chemical bonding forces. Second, heavy calcium carbonate is selected, and a portion of polyurea thickener is added beforehand to increase the thixotropy of the liquid material and inhibit the floating of microspheres. Third, using an aminosilane coupling agent, the amino groups attached to the outer side of the Si-O-Si covalent bonds can react with -NCO groups during the curing stage, introducing the Si-O-Si covalent bonds and hollow glass microspheres into the polymer backbone, reducing the floating rate of hollow glass microspheres during the mixing stage of components A and B. Fourth, a small amount of coupling agent is added to component A to ensure the pretreatment effect of hollow glass microspheres while allowing them to participate in the reaction with -NCO groups during the curing stage, initially increasing the mixing viscosity of components A and B, and avoiding the floating of hollow glass microspheres due to the decrease in viscosity after mixing. Fifth, by introducing a small amount of terminal amino polyether, the A / B... After mixing, the components rapidly thicken and significantly increase low-shear viscosity, forming a three-dimensional network structure that locks the hollow glass microspheres within, effectively preventing them from floating and separating. Through this five-fold anti-buoyancy system, the floating rate of hollow glass microspheres in liquid materials and during the solidification process is significantly reduced. (3) This invention constructs a low-damage mechanism for hollow glass microspheres through material matching and process control. First, a low-unsaturation, high-molecular-weight polyether polyol 1 is selected. Its low viscosity is beneficial for the initial dispersion of fillers and reduces the stirring shear force, avoiding the risk of hollow glass microsphere breakage due to the use of high-viscosity polyether. Second, an appropriate amount of styrene-acrylonitrile grafted polyether polyol (SAN) is selected. While improving the cohesion of the system, the viscosity is avoided from increasing excessively. The SAN particles adsorb onto the surface of the hollow glass microspheres to form a buffer layer, further reducing the shear force. Third, a small amount of terminal amino polyether is added stepwise to avoid the problem of instantaneous high viscosity extrusion of hollow glass microspheres caused by the traditional one-time addition of thickener. At the same time, a liquid environment with high thixotropy and medium viscosity is formed, reducing the dependence on high stirring intensity and reducing the breakage of hollow glass microspheres. Fourth, a vacuum low-speed stirring addition process is adopted. Through the synergistic effect of eliminating bubble disturbance and controlling shear force, the breakage rate of hollow glass microspheres is reduced. (4) When introducing polymer polyols, amino-terminated polyether thickeners and silane coupling agents, the reactivity of the system increases and the operability decreases. To this end, by using a reasonable ratio of isocyanate to polyether polyol in component B, and by combining low oil absorption filler and nonionic polymeric dispersant, the viscosity of the system is reduced to improve operability; at the same time, a delayed-thermal environmentally friendly organic bismuth / zinc composite catalyst is used to slow down the viscosity increase in the initial stage of material mixing, thus balancing the operability and post-curing time of the material. (5) The preparation method of the low-density buoyancy-resistant polyurethane runway material of the present invention is scientific, reasonable, simple and easy to implement, and suitable for industrial production. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments, but these embodiments do not limit the implementation of the present invention.

[0023] Unless otherwise specified, the raw materials used in the examples and comparative examples are all commercially available materials, and the process methods used in the examples and comparative examples are all conventional methods in the art.

[0024] The following is a description of some of the raw materials used in the examples and comparative examples: The method for preparing the modified hollow glass microspheres includes the following steps: A silane coupling agent was dissolved in an alcohol solvent to prepare a 2 wt.% silane coupling agent alcohol solution. Hollow glass microspheres were spray-treated with the silane coupling agent alcohol solution and then dried and cured at 76°C to obtain modified hollow glass microspheres.

[0025] The hollow glass microspheres are GS40 produced by Sinosteel Group Maanshan Mining Institute New Materials Technology Co., Ltd.; the silane coupling agent is γ-aminopropyltriethoxysilane, and the alcohol is ethanol. The modified hollow glass microspheres obtained had a compressive strength of 28 MPa, a particle size of 50 ± 2 μm, and a density of 0.4 ± 0.02 g / cm³. 3 The breakage rate was 2.3%.

[0026] Example 1 The aforementioned low-density, buoyancy-resistant polyurethane runway material is made from component A and component B in a mass ratio of 4.5:1, wherein component A comprises the following raw materials by mass percentage: DL-4000D: 41%; EP-903: 8%; Heavy calcium carbonate: 35%; Modified hollow glass microspheres: 8%; LHD-123: 1.2%; CUCAT-S01: 0.4%; KH-550: 1.5%; DISPERBYK-111: 0.8%; TEGO Airex 900: 0.3%; Tinuvin 329: 0.6%; Irganox 1010: 0.2%; Iron oxide red: 3%; Component B comprises the following raw materials by mass percentage: MDI-50: 70%; C220: 10%; C3050A: 20%.

[0027] The preparation method of the low-density, buoyancy-resistant polyurethane runway material includes the following steps: (1) DL-4000D, EP-903, TEGO Airex 900 (part 1) and DISPERBYK-111 were added to the reactor and heated to 60°C. Heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red were added and dispersed evenly. KH-550 and LHD-123 (part 1) were added and stirred at 60±5°C for 60 min. Then, the pressure was evacuated to ≤-0.07MPa and modified hollow glass microspheres and the remaining TEGO Airex 900 were added at a stirring speed of 480 rpm. The remaining LHD-123 was added and the temperature was lowered to 60°C. CUCAT-S01 was added and stirred for 60 min to obtain component A. (2) Add MDI-50, C220 and C3050A into the reactor, heat to 82.5±2.5℃, and keep the temperature for 1.5h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

[0028] The amount of TEGO Airex 900 used in the first part is 50 wt.% of the total amount of TEGO Airex 900 used; the amount of LHD-123 used in the first part is 50 wt.% of the total amount of LHD-123 used.

[0029] Example 2 The aforementioned low-density, buoyancy-resistant polyurethane runway material is made from component A and component B in a mass ratio of 4.5:1, wherein component A comprises the following raw materials by mass percentage: DL-4000D: 40%; EP-903: 8%; Heavy calcium carbonate: 33%; Modified hollow glass microspheres: 7%; LHD-123: 1%; CUCAT-S01: 1.5%; KH-550: 1.8%; DISPERBYK-111: 1.2%; TEGO Airex 900: 0.6%; Tinuvin 329: 0.9%; Irganox 1010: 0.5%; Iron oxide red: 4.5%; Component B comprises the following raw materials by mass percentage: MDI-50: 75%; C220: 16%; C3050A: 9%.

[0030] The preparation method of the low-density, buoyancy-resistant polyurethane runway material is the same as that in Example 1.

[0031] Example 3 The aforementioned low-density, buoyancy-resistant polyurethane runway material is made from component A and component B in a mass ratio of 5.5:1, wherein component A comprises the following raw materials by mass percentage: DL-4000D: 54%; EP-903: 15%; Heavy calcium carbonate: 20%; Modified hollow glass microspheres: 4%; LHD-123: 0.8%; CUCAT-S01: 0.3%; KH-550: 1.5%; DISPERBYK-111: 0.4%; TEGO Airex 900: 0.2%; Tinuvin 329: 0.3%; Irganox 1010: 0.1%; Iron oxide red: 3.4%; Component B comprises the following raw materials by mass percentage: MDI-50: 80%; C220: 13%; C3050A: 7%.

[0032] The preparation method of the low-density, buoyancy-resistant polyurethane runway material is the same as that in Example 1.

[0033] Comparative Example 1 The difference from Example 1 is that the modified hollow glass microspheres in component A are replaced with the same percentage of unmodified hollow glass microspheres GS40 by mass, while the rest is the same as in Example 1.

[0034] Comparative Example 2 The difference from Example 1 is that the polyurea thickener LHD-123 in component A is added only once.

[0035] The preparation method of the low-density, buoyancy-resistant polyurethane runway material includes the following steps: (1) DL-4000D, EP-903, TEGO Airex 900 and DISPERBYK-111 were added to the reactor and heated to 60°C. Heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red were added and dispersed evenly. KH-550 and LHD-123 were added and stirred at 60±5°C for 90 min. Then the vacuum was drawn to a pressure ≤-0.07MPa. Modified hollow glass microspheres and the remaining TEGO Airex 900 were added at a stirring speed of 480 rpm. The temperature was lowered to 60°C and CUCAT-S01 was added. The mixture was stirred for 60 min to obtain component A. (2) Add MDI-50, C220 and C3050A into the reactor, heat to 82.5±2.5℃, and keep the temperature for 1.5h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

[0036] The first part of the TEGO Airex 900 used is 50 wt. of the total TEGO Airex 900 used.

[0037] Everything else is the same as in Example 1.

[0038] Comparative Example 3 The difference from Example 1 is that no catalyst is added to component A, and the mass percentage of heavy calcium carbonate is increased to 35.4%, while the rest is the same as in Example 1.

[0039] Comparative Example 4 The difference from Example 1 is that no coupling agent is added to component A, and the mass percentage of heavy calcium carbonate is increased to 36.5%, while the rest is the same as in Example 1.

[0040] Comparative Example 5 The difference from Example 1 is that no polymer polyol is added to component A, and the mass percentage of heavy calcium carbonate is increased to 38%, while the rest is the same as in Example 1.

[0041] Comparative Example 6 The difference from Example 1 is that vacuum degassing technology is not used in component A.

[0042] The preparation method of the low-density, buoyancy-resistant polyurethane runway material includes the following steps: (1) DL-4000D, EP-903, TEGO Airex 900 (part 1) and DISPERBYK-111 were added to the reactor and heated to 60°C. Heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red were added and dispersed evenly. KH-550 and LHD-123 (part 1) were added and stirred at 60±5°C for 60 min. Modified hollow glass microspheres and the remaining TEGO Airex 900 were added at a stirring speed of 480 rpm. The remaining LHD-123 was added and the temperature was lowered to 60°C. CUCAT-S01 was added and stirred for 60 min to obtain component A. (2) Add MDI-50, C220 and C3050A into the reactor, heat to 82.5±2.5℃, and keep the temperature for 1.5h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

[0043] The amount of TEGO Airex 900 used in the first part is 50 wt.% of the total amount of TEGO Airex 900 used; the amount of LHD-123 used in the first part is 50 wt.% of the total amount of LHD-123 used.

[0044] Everything else is the same as in Example 1.

[0045] Comparative Example 7 The aforementioned low-density, buoyancy-resistant polyurethane runway material is made from component A and component B in a mass ratio of 4.5:1, wherein component A comprises the following raw materials by mass percentage: DL-4000D: 58%; Heavy calcium carbonate: 35.9%; Fumed silica XH-200: 1.2%; DISPERBYK-111: 0.8%; TEGO Airex 900: 0.3%; Tinuvin 329: 0.6%; Irganox 1010: 0.2%; Iron oxide red: 3%; Component B comprises the following raw materials by mass percentage: MDI-50: 70%; C220: 10%; C3050A: 20%.

[0046] The fumed silica XH-200 was purchased from Taicang Xinhong Chemical Co., Ltd.

[0047] The preparation method of the low-density, buoyancy-resistant polyurethane runway material includes the following steps: (1) DL-4000D, the first part TEGO Airex 900 and DISPERBYK-111 were put into the reactor, heated to 60°C, and heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red were added. After being dispersed evenly, the first part of fumed silica XH-200 was added. The mixture was kept warm and stirred at 60±5°C for 60 min. Then, the vacuum was drawn to a pressure ≤-0.07MPa. The remaining TEGO Airex 900 was added at a stirring speed of 480 rpm, and the remaining fumed silica XH-200 was added. The mixture was cooled to 60°C and stirred for 60 min to obtain component A. (2) Add MDI-50, C220 and C3050A into the reactor, heat to 82.5±2.5℃, and keep the temperature for 1.5h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

[0048] The amount of the first part TEGO Airex 900 is 50 wt. of the total amount of TEGO Airex 900; the amount of the first part fumed silica XH-200 is 50 wt. of the total amount of fumed silica XH-200.

[0049] The polyurethane running track materials prepared in Examples 1-3 and Comparative Examples 1-7 were subjected to performance tests, and the test methods are as follows: Density: Tested according to GB / T 1033.1-2008; Tensile strength: Tested in accordance with GB / T 528-2009; Slurry stability: Component A was allowed to stand at 45°C, and the changes in the material were observed.

[0050] The test results are shown in Table 1.

[0051] Table 1 Performance Test Results

[0052] As shown in Table 1, the densities of Examples 1-3 range from 1.03 to 1.08 g / cm³. 3 The concentration is significantly lower than that of traditional polyurethane running track materials (typically 1.3~1.5 g / cm³). 3By introducing modified hollow glass microspheres, the material density was effectively reduced while maintaining excellent mechanical properties and stability. The densities of Comparative Examples 1-7 ranged from 1.35 to 1.48 g / cm³. 3 The density of these materials is close to or higher than that of traditional materials, highlighting the importance of formulation optimization in this invention.

[0053] According to the viscosity data in Table 1, the viscosity of component A in Examples 1-3 is between 2800 and 3500 cP, which is within the ideal process range and beneficial for application and curing. The viscosity of Comparative Examples 1-7 is generally too high. Excessively high viscosity may lead to difficulties in application and prolonged curing time. This indicates that the present invention has successfully reduced viscosity and improved operability through process control and formulation optimization.

[0054] According to the tensile strength data in Table 1, the tensile strengths of Examples 1-3 are between 2.7 and 2.9 MPa, meeting the requirements for high-standard runway materials. The tensile strengths of Comparative Examples 1-7 are between 1.8 and 2.2 MPa, significantly lower than those of the Examples. This indicates that unmodified materials or process defects can lead to a decrease in the mechanical properties of the material. The present invention, by introducing components such as polymeric polyols, amino-terminated polyether thickeners, and silane coupling agents, significantly improves the tensile strength of the material.

[0055] According to the slurry stability data in Table 1, component A of Examples 1-3 showed no stratification after standing at 45°C for 48 days, indicating good system stability. However, Comparative Examples 1-7 generally exhibited stratification issues, with stratification becoming more severe the shorter the standing time. This demonstrates that the five-fold buoyancy suppression system constructed in this invention effectively solves the problem of glass microsphere flotation, improving the uniformity and stability of the material.

[0056] In summary, the performance data from Examples 1-3 demonstrate that this invention, through optimized formulation and process, effectively reduces the density of polyurethane running track materials while significantly improving mechanical properties and stability. Comparative Examples 1-7, due to the lack of key components or insufficient process control, exhibit higher density, higher viscosity, decreased mechanical properties, and poor stability. This highlights the importance of each step and component in the technical solution of this invention, proving that it can significantly improve overall performance while reducing material density, demonstrating promising application prospects.

Claims

1. A low-density, buoyancy-resistant polyurethane running track material, characterized in that, It is made from component A and component B in a mass ratio of (4~5.5):1, wherein component A comprises the following raw materials by mass percentage: Polyether polyol 1: 40~55%; Polymer polyols: 8~15%; Filler: 20~35%; Modified hollow glass microspheres: 3~8%; Polyurea thickener: 0.8~1.5%; Catalyst: 0.3~1.5%; Coupling agent: 1~2%; Dispersant: 0.4~1.2%; Defoamer: 0.2~0.6%; UV absorber: 0.3~1%; Antioxidant: 0.1~0.5%; Pigment: 2-5%; Component B comprises the following raw materials by mass percentage: Isocyanate: 70~80%; Polyether polyol 2: 10~16%; Polyether polyol 3: 7~20%; The polyether polyol 1 has a functionality of 2 to 3 and a number-average molecular weight of 2000 to 4000. The polyether polyol 2 has a functionality of 2 and a hydroxyl value of 54.5~57.5 mgKOH / g; The polyether polyol 3 has a functionality of 3 and a hydroxyl value of 54.5~57.5 mgKOH / g; The modified hollow glass microspheres are hollow glass microspheres that have undergone surface treatment with a silane coupling agent alcohol solution.

2. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The polymer polyol is a styrene-acrylonitrile copolymer; the filler is heavy calcium carbonate.

3. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The method for preparing the modified hollow glass microspheres includes the following steps: A silane coupling agent was dissolved in an alcohol solvent to prepare a silane coupling agent alcohol solution. Hollow glass microspheres were sprayed with the silane coupling agent alcohol solution and then dried and cured at 60~80℃ to obtain modified hollow glass microspheres.

4. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The polyurea thickener is an amino-terminated polyether compound.

5. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The catalyst is an organic bismuth / zinc composite catalyst; the coupling agent is γ-aminopropyltriethoxysilane.

6. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The dispersant is a nonionic polymeric dispersant; the defoamer is an organosilicone defoamer.

7. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The ultraviolet absorber is a benzotriazole ultraviolet absorber; the antioxidant is a hindered phenolic antioxidant.

8. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, characterized in that, The isocyanate mentioned is MDI.

9. A method for preparing the low-density, buoyancy-resistant polyurethane runway material according to any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Add polyether polyol 1, polymer polyol, first part defoamer and dispersant into the reactor, heat to 55~65℃, add filler, ultraviolet absorber, antioxidant and pigment, disperse evenly and then add coupling agent and first part polyurea thickener, keep warm and stir at 55~65℃ for 60~90min, then evacuate to pressure ≤-0.07MPa, add modified hollow glass microspheres and remaining defoamer at stirring speed ≤500rpm, then add remaining polyurea thickener, cool to below 60℃, add catalyst, stir for 40~60min to obtain component A; (2) Isocyanate, polyether polyol 2 and polyether polyol 3 are added to the reaction vessel, heated to 80~85℃, and kept at the temperature for 1.5~2h to obtain component B; (3) When using, mix component A and component B evenly according to the mass ratio, spread them out, and cure at room temperature to obtain low-density buoyancy-resistant polyurethane runway material.

10. The method for preparing the low-density, buoyancy-resistant polyurethane runway material according to claim 9, characterized in that, The amount of the first part of the defoamer is 40-60 wt.% of the total amount of defoamer; the amount of the first part of the polyurea thickener is 40-60 wt.% of the total amount of polyurea thickener.

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