Low density, float resistant polyurethane runway material and method of making same

Abstract

The application belongs to the technical field of polyurethane, and particularly relates to low-density anti-floating polyurethane runway material and a preparation method thereof. The polyurethane runway material is made of A component and B component. The A component comprises the following raw materials: polyether polyol, polymer polyol, filler, modified hollow glass microbead, polyurea thickening agent, catalyst, silane coupling agent, dispersing agent, defoaming agent, ultraviolet absorber, antioxidant, and pigment. The B component comprises the following raw materials: isocyanate, polyether polyol 2, and polyether polyol 3. By introducing the modified hollow glass microbead and combining the low-damage mechanism, the density of the polyurethane runway material is significantly reduced, the overall weight is reduced, the material cost is reduced by means of the volume effect, and the basic performance and stability of the material are ensured. By constructing a five-fold anti-floating system, the floating problem of the hollow glass microbead in the liquid material and the curing process is effectively solved, and the product uniformity is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of polyurethane, and particularly relates to a low-density anti-floating polyurethane runway material and a preparation method thereof. BACKGROUND

[0002] Polyurethane runway materials have been widely used due to their excellent wear resistance, chemical corrosion resistance and controllable mechanical properties. However, traditional polyurethane runway materials have problems such as high density and large viscosity. At present, there are two main methods to reduce the density of polyurethane: one is chemical foaming method, that is, to form closed or open cell structure by introducing foaming agent, but this method has problems such as uneven distribution of pores and significant decrease of mechanical strength; the other is physical filling method, that is, to add hollow polymer microspheres, expanded perlite and other lightweight fillers, but such fillers are easy to be broken in high-speed mixing process, and have poor interfacial adhesion with polyurethane matrix, which is easy to lead to the phenomenon of floating and decrease the toughness of the composite material.

[0003] At present, hollow glass microspheres (density 0.2~0.6g / cm 3 ) can effectively reduce the density of the system in theory, but still face technical problems in practical application. On the one hand, dispersion problem, the surface of glass microspheres is smooth, and the compatibility with polyurethane liquid material is poor, and conventional high-speed stirring can easily damage the structure of microspheres, so that the density reduction effect is limited; on the other hand, the problem of floating, there is a significant density difference between glass microspheres and polyurethane liquid material, and during the process of standing and storage, the microspheres will float due to the action of gravity, which affects the uniformity of the final product. Therefore, it is necessary to develop a two-component low-density anti-floating polyurethane runway material to solve the problems of polyurethane runway material. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a low-density anti-floating polyurethane runway material, by introducing modified hollow glass microspheres and combining with low-damage mechanism, the density of polyurethane runway material is significantly reduced, the overall weight is lightened, the material cost is reduced by virtue of volume effect, and the basic performance and stability of the material are guaranteed; by constructing a five-fold anti-floating system, the problem of floating of hollow glass microspheres in liquid material and curing process is effectively solved, and the uniformity of the product is improved.

[0005] Another purpose of the present application is to provide a preparation method of a low-density anti-floating polyurethane runway material, by reasonably matching the materials and controlling the reaction activity, the operability and post-curing performance of the material are balanced on the basis of ensuring the dispersion and low damage of the system, which has performance advantages and process feasibility, and is suitable for industrial production.

[0006] The technical solutions adopted by the present application are as follows:

[0007] The low-density anti-floating polyurethane runway material is prepared from A component and B component in a mass ratio of (4-5.5):1, wherein the A component comprises the following raw materials in mass percentage:

[0008] Polyether polyol 1: 40-55%;

[0009] Polymer polyol: 8-15%;

[0010] Filler: 20-35%;

[0011] Modified hollow glass microbeads: 3-8%;

[0012] Polyurea thickening agent: 0.8-1.5%;

[0013] Catalyst: 0.3-1.5%;

[0014] Coupling agent: 1-2%;

[0015] Dispersant: 0.4-1.2%;

[0016] Defoaming agent: 0.2-0.6%;

[0017] Ultraviolet absorber: 0.3-1%;

[0018] Antioxidant: 0.1-0.5%;

[0019] Pigment: 2-5%;

[0020] The B component comprises the following raw materials in mass percentage:

[0021] Isocyanate: 70-80%;

[0022] Polyether polyol 2: 10-16%;

[0023] Polyether polyol 3: 7-20%;

[0024] The polyether polyol 1 has a functionality of 2-3 and a number average molecular weight of 2000-4000, preferably DL-4000D produced by Shandong Lanshengdong Co., Ltd., and has a low unsaturation degree;

[0025] The polyether polyol 2 has a functionality of 2 and a hydroxyl value of 54.5-57.5 mgKOH / g, preferably C220 produced by Shandong Yinaowei New Material Co., Ltd.

[0026] The polyether polyol 3 has a functionality of 3 and a hydroxyl value of 54.5-57.5 mgKOH / g, preferably C3050A produced by Shandong Yinaowei New Material Co., Ltd.

[0027] The modified hollow glass microbeads are hollow glass microbeads treated by a silane coupling agent alcohol solution.

[0028] The polymer polyol is a styrene-acrylonitrile copolymer, preferably EP903 produced by China Petroleum Chemical Co., Ltd.; the filler is heavy calcium carbonate with a particle size of 400 mesh and a density of 2.9 g / cm 3 , purchased from Jiangxi Guangyuan Chemical Industry Co., Ltd.

[0029] The preparation method of the modified hollow glass microbeads comprises the following steps:

[0030] The silane coupling agent is dissolved in an alcohol solvent to prepare a silane coupling agent alcohol solution; the hollow glass microbeads are treated by spraying the silane coupling agent alcohol solution, and then dried and cured at 60-80℃ to obtain the modified hollow glass microbeads.

[0031] The hollow glass microbeads are preferably GS40 produced by Maanshan Mining Institute New Material Technology Co., Ltd.

[0032] 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-aminopropyl triethoxysilane, and the alcohol is preferably ethanol;

[0033] The prepared modified hollow glass microbeads have a compressive strength of ≥28 MPa, a particle size of 50±2 μm, a density of 0.4±0.02 g / cm 3 , and a breakage rate of <3%.

[0034] The polyurea thickening agent is an amino-terminated polyether compound, preferably LHD-123 from Shandong Longhua New Material Co., Ltd.

[0035] The catalyst is an organic bismuth / zinc composite catalyst, preferably CUCAT-S01 produced by Guangzhou Youyun Synthetic Material Co., Ltd.

[0036] The coupling agent is γ-aminopropyl triethoxysilane.

[0037] The dispersing agent is a non-ionic high molecular dispersing agent, preferably DISPERBYK-111 produced by BYK Chemicals, Germany.

[0038] The defoaming agent is a silicone defoaming agent, preferably TEGO Airex 900 produced by Wacker Industrial Group.

[0039] The ultraviolet absorber is a benzotriazole ultraviolet absorber, preferably Tinuvin 329 produced by BASF, Germany.

[0040] The antioxidant is a hindered phenolic antioxidant, preferably Irganox 1010 produced by BASF, Germany.

[0041] The pigment is preferably iron oxide red.

[0042] The isocyanate is MDI, preferably MDI-50 produced by Wanhua Chemical Group Co., Ltd.

[0043] The preparation method of the low-density anti-floating polyurethane runway material comprises the following steps:

[0044] (1) Put polyether polyol 1, polymer polyol, the first part of the defoaming agent and the dispersant into the reaction kettle, heat to 55~65℃, add the filler, the ultraviolet absorber, the antioxidant and the pigment, disperse uniformly, then add the coupling agent, the first part of the polyurea thickening agent, heat to 55~65℃, and keep stirring for 60~90min, then vacuumize to the pressure≤-0.07MPa, add the modified hollow glass microsphere and the remaining defoaming agent under the condition of stirring speed≤500rpm, then add the remaining polyurea thickening agent, cool to below 60℃, add the catalyst, and stir for 40~60min, then the A component is obtained;

[0045] (2) Put the isocyanate, polyether polyol 2 and polyether polyol 3 into the reaction kettle, heat to 80~85℃, and keep reacting for 1.5~2h, then the B component is obtained;

[0046] (3) When used, mix the A component and the B component uniformly according to the mass ratio, spread, and the low-density anti-floating polyurethane runway material is obtained after normal temperature curing.

[0047] The amount of the first part of the defoaming agent is 40~60wt.% of the total amount of the defoaming agent; the amount of the first part of the polyurea thickening agent is 40~60wt.% of the total amount of the polyurea thickening agent.

[0048] Compared with the prior art, the low-density anti-floating polyurethane runway material has the following beneficial effects:

[0049] (1) The low-density anti-floating polyurethane runway material has the advantages that the modified hollow glass microsphere is introduced, the overall weight of the runway material is reduced by using the low-density characteristics of the modified hollow glass microsphere, the material cost is reduced by the volume effect, and the balance between the material performance and stability is realized under the premise of ensuring the low density of the material.

[0050] (2) The present application constructs a five-fold floating system to reduce the floating rate of hollow glass microspheres. Firstly, after the hollow glass microspheres are modified by amino silane coupling agent, a Si-O-Si covalent bond structure is formed on the surface, and the floating force in the A component is balanced by the chemical bond force; secondly, heavy calcium carbonate is selected, and part of the polyurea thickening agent is added in advance, and the thixotropy of the liquid material is increased to inhibit the floating of the microspheres; thirdly, amino silane coupling agent is used, and the amino group outside the Si-O-Si covalent bond can react with the -NCO group in the curing stage, so as to introduce the Si-O-Si covalent bond and the hollow glass microspheres into the polymer main chain, and reduce the floating rate of the hollow glass microspheres in the A / B component mixing stage; fourthly, a small amount of coupling agent is added in the A component, which ensures the pretreatment effect of the hollow glass microspheres and makes them participate in the reaction with the -NCO group in the curing stage, so as to preliminarily improve the mixing viscosity of the A / B component and avoid the floating of the hollow glass microspheres due to the decrease of the viscosity after mixing; fifthly, a small amount of amino-terminated polyether is introduced to quickly thicken the A / B component after mixing and greatly improve the low shear viscosity, so as to form a three-dimensional network structure and lock the hollow glass microspheres, which can effectively prevent the floating and separation of the hollow glass microspheres. Through the above five-fold floating inhibition system, the floating rate of the hollow glass microspheres in the liquid material and the curing process is significantly reduced;

[0051] (3) The present application constructs a low-damage mechanism for hollow glass microspheres through material matching and process control. Firstly, low-unsaturation and high-molecular-weight polyether polyol 1 is selected, which has low viscosity characteristics and is beneficial to the initial filler dispersion and reduces the stirring shear force, avoiding the increase of the risk of damage to the hollow glass microspheres due to the use of high-viscosity polyether; secondly, an appropriate amount of styrene-acrylonitrile grafted polyether polyol (SAN) is selected, which can improve the cohesion of the system while avoiding excessive increase of the viscosity, and the SAN particles are adsorbed on the surface of the hollow glass microspheres to form a buffer layer, further reducing the shear force; thirdly, a small amount of amino-terminated polyether is added step by step to avoid the problem of instantaneous high viscosity extrusion of the hollow glass microspheres caused by traditional one-time addition of thickening agent, and 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 damage to the hollow glass microspheres; fourthly, a vacuum low-speed stirring addition process is adopted, which cooperates with the double mechanisms of eliminating bubble disturbance and controlling shear force to realize the reduction of the damage rate of the hollow glass microspheres;

[0052] (4) When introducing polymer polyol, amino-terminated polyether thickening agent and silane coupling agent, the system reaction activity will increase and the operability will decrease. Therefore, by reasonably matching isocyanate and polyether polyol in the B component, and by using low oil absorption value filler and non-ionic high molecular dispersant, the system viscosity is reduced to improve the operability; at the same time, a delayed-thermal sensitive type environmentally friendly organic bismuth / zinc composite catalyst is used, so that the viscosity increases slowly at the initial stage of material mixing, balancing the operability of the material and the post-curing time;

[0053] (5) The preparation method of the low-density anti-floating polyurethane runway material is scientific and reasonable, simple and easy to implement, and suitable for industrial production. DETAILED DESCRIPTION

[0054] The application will be further described in conjunction with the following examples, but it does not limit the implementation of the application.

[0055] The raw materials used in the examples and comparative examples are all conventional commercially available raw materials unless otherwise specified, and the process methods used in the examples and comparative examples are all conventional methods in the art unless otherwise specified.

[0056] Some of the raw materials used in the examples and comparative examples are described as follows:

[0057] The preparation method of the modified hollow glass microbeads comprises the following steps:

[0058] The silane coupling agent is dissolved in an alcohol solvent to prepare a silane coupling agent alcohol solution with a concentration of 2wt.%; the hollow glass microbeads are then treated by spraying the silane coupling agent alcohol solution, and then dried and cured at 76℃ to obtain the modified hollow glass microbeads.

[0059] The hollow glass microbeads are GS40 produced by Maanshan Mining Institute New Material Technology Co., Ltd. of Maanshan Iron & Steel Group; the silane coupling agent is γ-aminopropyl triethoxysilane, and the alcohol is ethanol;

[0060] The compressive strength of the modified hollow glass microbeads obtained is 28MPa, the particle size is 50±2μm, the density is 0.4±0.02g / cm 3 , and the breakage rate is 2.3%.

[0061] Example 1

[0062] The low-density anti-floating polyurethane runway material is prepared from the A component and the B component in a mass ratio of 4.5:1, wherein the A component comprises the following raw materials in mass percentage:

[0063] DL-4000D: 41%;

[0064] EP-903: 8%;

[0065] Heavy calcium carbonate: 35%;

[0066] Modified hollow glass microbeads: 8%;

[0067] LHD-123: 1.2%;

[0068] CUCAT-S01: 0.4%;

[0069] KH-550: 1.5%;

[0070] DISPERBYK-111: 0.8%;

[0071] TEGO Airex 900: 0.3%;

[0072] Tinuvin 329: 0.6%;

[0073] Irganox 1010: 0.2%;

[0074] Iron oxide red: 3%;

[0075] The B component comprises the following raw materials in mass percentage:

[0076] MDI-50: 70%;

[0077] C220: 10%;

[0078] C3050A: 20%.

[0079] The preparation method of the low-density anti-floating polyurethane runway material comprises the following steps:

[0080] (1) Put DL-4000D, EP-903, the first part of TEGO Airex 900 and DISPERBYK-111 into a reaction kettle, heat to 60℃, add heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red, disperse uniformly, then add KH-550, the first part of LHD-123, and keep stirring at 60±5℃ for 60min, then vacuumize to a pressure of ≤-0.07MPa, add modified hollow glass microspheres and the remaining TEGO Airex 900 under the condition of a stirring speed of 480rpm, then add the remaining LHD-123, cool to 60℃, add CUCAT-S01, and stir for 60min to obtain the A component;

[0081] (2) Put MDI-50, C220 and C3050A into a reaction kettle, heat to 82.5±2.5℃, and keep reacting for 1.5h to obtain the B component;

[0082] (3) When used, mix the A component and the B component uniformly according to the mass ratio, spread, and then obtain the low-density anti-floating polyurethane runway material after curing at room temperature.

[0083] The amount of the first part of TEGO Airex 900 is 50wt.% of the total amount of TEGO Airex 900; and the amount of the first part of LHD-123 is 50wt.% of the total amount of LHD-123.

[0084] Example 2

[0085] The low density anti-floating polyurethane runway material is made of A component and B component with a mass ratio of 4.5:1, wherein the A component comprises the following raw materials in mass percentage:

[0086] DL-4000D: 40%;

[0087] EP-903: 8%;

[0088] Heavy calcium carbonate: 33%;

[0089] Modified hollow glass microbeads: 7%;

[0090] LHD-123: 1%;

[0091] CUCAT-S01: 1.5%;

[0092] KH-550: 1.8%;

[0093] DISPERBYK-111: 1.2%;

[0094] TEGO Airex 900: 0.6%;

[0095] Tinuvin 329: 0.9%;

[0096] Irganox 1010: 0.5%;

[0097] Iron oxide red: 4.5%;

[0098] The B component comprises the following raw materials in mass percentage:

[0099] MDI-50: 75%;

[0100] C220: 16%;

[0101] C3050A: 9%.

[0102] The preparation method of the low density anti-floating polyurethane runway material, the steps are the same as those of Example 1.

[0103] Example 3

[0104] The low density anti-floating polyurethane runway material is made of A component and B component with a mass ratio of 4.5:1, wherein the A component comprises the following raw materials in mass percentage:

[0105] DL-4000D: 54%;

[0106] EP-903: 15%;

[0107] Heavy calcium carbonate: 20%;

[0108] Modified hollow glass microsphere: 4%;

[0109] LHD-123: 0.8%;

[0110] CUCAT-S01: 0.3%;

[0111] KH-550: 1.5%;

[0112] DISPERBYK-111: 0.4%;

[0113] TEGO Airex 900: 0.2%;

[0114] Tinuvin 329: 0.3%;

[0115] Irganox 1010: 0.1%;

[0116] Iron oxide red: 3.4%;

[0117] The B component includes the following raw materials in mass percentage:

[0118] MDI-50: 80%;

[0119] C220: 13%;

[0120] C3050A: 7%.

[0121] The preparation method of the low-density anti-float polyurethane runway material is the same as that of Example 1.

[0122] Comparative Example 1

[0123] The difference from Example 1 is that the modified hollow glass microsphere in the A component is replaced by the same mass percentage of unmodified hollow glass microsphere GS40, and the others are the same as Example 1.

[0124] Comparative Example 2

[0125] The difference from Example 1 is that the polyurea thickener LHD-123 in the A component is added at one time.

[0126] The preparation method of the low-density anti-float polyurethane runway material includes the following steps:

[0127] (1) Put DL-4000D, EP-903, the first part of TEGO Airex 900 and DISPERBYK-111 into a reaction kettle, heat to 60℃, add heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red, disperse uniformly, then add KH-550 and LHD-123, keep stirring at 60±5℃ for 90min, then vacuum to pressure≤-0.07MPa, add modified hollow glass beads and the remaining TEGO Airex 900 under the condition of stirring speed of 480rpm, cool to 60℃, add CUCAT-S01, stir for 60min, then the A component is obtained;

[0128] (2) Put MDI-50, C220 and C3050A into a reaction kettle, heat to 82.5±2.5℃, keep stirring for 1.5h, then the B component is obtained;

[0129] (3) When used, mix the A component and the B component uniformly according to the mass ratio, spread, and the low-density anti-floating polyurethane runway material is obtained after curing at room temperature.

[0130] The amount of the first part of TEGO Airex 900 is 50wt.% of the total amount of TEGO Airex 900.

[0131] The others are the same as example 1.

[0132] Comparative example 3

[0133] The difference from example 1 is that no catalyst is added in the A component, and the mass percentage of heavy calcium carbonate is increased to 35.4%, and the others are the same as example 1.

[0134] Comparative example 4

[0135] The difference from example 1 is that no coupling agent is added in the A component, and the mass percentage of heavy calcium carbonate is increased to 36.5%, and the others are the same as example 1.

[0136] Comparative example 5

[0137] The difference from example 1 is that no polymer polyol is added in the A component, and the mass percentage of heavy calcium carbonate is increased to 38%, and the others are the same as example 1.

[0138] Comparative example 6

[0139] The difference from example 1 is that no vacuum defoaming technology is used in the A component.

[0140] The preparation method of the low-density anti-floating polyurethane runway material comprises the following steps:

[0141] (1) Put DL-4000D, EP-903, the first part of TEGO Airex 900 and DISPERBYK-111 into a reaction kettle, heat to 60℃, add heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red, disperse uniformly, then add KH-550, the first part of LHD-123, keep stirring at 60±5℃ for 60min, then add modified hollow glass beads and the rest of TEGO Airex 900 under the condition of stirring speed of 480rpm, then add the rest of LHD-123, cool to 60℃, add CUCAT-S01, stir for 60min, then the A component is obtained;

[0142] (2) Put MDI-50, C220 and C3050A into a reaction kettle, heat to 82.5±2.5℃, keep stirring for 1.5h, then the B component is obtained;

[0143] (3) When used, mix the A component and the B component uniformly according to the mass ratio, spread, and then the low-density anti-floating polyurethane runway material is obtained after curing at room temperature.

[0144] The amount of the first part of TEGO Airex 900 is 50wt.% of the total amount of TEGO Airex 900; the amount of the first part of LHD-123 is 50wt.% of the total amount of LHD-123.

[0145] The other is the same as example 1.

[0146] Comparative example 7

[0147] The low-density anti-floating polyurethane runway material is made of the A component and the B component according to the mass ratio of 4.5:1, wherein the A component comprises the following raw materials in mass percentage:

[0148] DL-4000D: 58%;

[0149] Heavy calcium carbonate: 35.9%;

[0150] Fumed silica XH-200: 1.2%;

[0151] DISPERBYK-111: 0.8%;

[0152] TEGO Airex 900: 0.3%;

[0153] Tinuvin 329: 0.6%;

[0154] Irganox 1010: 0.2%;

[0155] Iron oxide red: 3%;

[0156] The B component comprises the following raw materials in mass percentage:

[0157] MDI-50: 70%;

[0158] C220: 10%;

[0159] C3050A: 20%.

[0160] The gas phase silica XH-200 is purchased from Taicang Xinhong Chemical Co., Ltd.

[0161] The preparation method of the low-density anti-floating polyurethane runway material comprises the following steps:

[0162] (1) Put the DL-4000D, the first part of TEGO Airex 900 and DISPERBYK-111 into a reaction kettle, heat to 60℃, add heavy calcium carbonate, Tinuvin 329, Irganox 1010 and iron oxide red, disperse uniformly, then add the first part of gas phase silica XH-200, keep the temperature at 60±5℃ and stir for 60 min, then vacuumize to a pressure of ≤-0.07MPa, add the remaining TEGO Airex 900 under the condition of a stirring speed of 480rpm, then add the remaining gas phase silica XH-200, cool to 60℃, and stir for 60 min, to obtain the A component;

[0163] (2) Put the MDI-50, C220 and C3050A into a reaction kettle, heat to 82.5±2.5℃, and keep the temperature for 1.5h to obtain the B component;

[0164] (3) When used, mix the A component and the B component uniformly according to the mass ratio, spread, and the low-density anti-floating polyurethane runway material is obtained after curing at room temperature.

[0165] The amount of the first part of TEGO Airex 900 is 50wt.% of the total amount of TEGO Airex 900; and the amount of the first part of gas phase silica XH-200 is 50wt.% of the total amount of gas phase silica XH-200.

[0166] The polyurethane runway materials prepared in Examples 1-3 and Comparative Examples 1-7 are subjected to performance tests, and the test methods are as follows:

[0167] Density: tested according to GB / T 1033.1-2008;

[0168] Tensile strength: tested according to GB / T 528-2009;

[0169] Slurry stability: observe the material changes of A component under the condition of 45℃.

[0170] The test results are shown in Table 1.

[0171] Table 1 Performance test results

[0172]

[0173] According to the data in Table 1, the density of Examples 1-3 is between 1.03-1.08 g / cm 3 , which is significantly lower than the traditional polyurethane runway material (usually 1.3-1.5 g / cm 3 ). By introducing modified hollow glass microspheres, the material density is effectively reduced, while maintaining excellent mechanical properties and stability. The density of Comparative Examples 1-7 is between 1.35-1.48 g / cm 3 , close to or higher than the density of traditional materials, highlighting the importance of formula optimization in the invention.

[0174] According to the viscosity data in Table 1, the viscosity of A component of Examples 1-3 is between 2800-3500 cP, which is in the ideal process range, which is beneficial to construction and curing. The viscosity of Comparative Examples 1-7 is generally high. Excessive viscosity may cause construction difficulties and prolonged curing time, which indicates that the invention successfully reduces the viscosity and improves the operability through process control and formula optimization.

[0175] According to the tensile strength data in Table 1, the tensile strength of Examples 1-3 is between 2.7-2.9 MPa, which meets the requirements of high-standard runway materials. The tensile strength of Comparative Examples 1-7 is between 1.8-2.2 MPa, which is significantly lower than the examples. This shows that unmodified or process defects can lead to a decrease in material mechanical properties, while the invention significantly improves the tensile strength of the material by introducing components such as polyol, amino-terminated polyether thickener and silane coupling agent.

[0176] According to the slurry stability data in Table 1, the A component of Examples 1-3 has no delamination after standing at 45℃ for 48 days, indicating good system stability. While Comparative Examples 1-7 generally have delamination problems, the shorter the standing time, the more serious the delamination. This shows that the five anti-floating systems constructed in the invention effectively solve the problem of glass microsphere floating, and improve the uniformity and stability of the material.

[0177] In summary, the performance data of Examples 1-3 show that the present application effectively reduces the density of polyurethane runway material by optimizing the formulation and process, while significantly improving the mechanical properties and stability. Comparative Examples 1-7 have higher density, larger viscosity, lower mechanical properties and poor stability due to the lack of key components or insufficient process control. This highlights the importance of each step and component in the technical solution of the present application, proving that it can significantly improve the comprehensive performance while reducing the density of the material, and has good 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 polymer polyol is a styrene-acrylonitrile copolymer; The modified hollow glass microspheres are hollow glass microspheres that have been surface-treated with a silane coupling agent alcohol solution; The polyurea thickener is an amino-terminated polyether compound; 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.

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

5. 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.

6. 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.

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

8. The low-density, buoyancy-resistant polyurethane runway material according to claim 1, 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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