Polyurethane floor containing modified hollow glass beads and preparation method thereof
By surface modification treatment of hollow glass microspheres with nano-silica and isocyanate, the problem of poor compatibility between hollow glass microspheres and polyurethane matrix is solved, the wear resistance and weather resistance of the flooring are improved, and lightweighting and environmental protection are achieved.
Patent Information
- Application Number
- CN202511869556.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-01-23
AI Technical Summary
Untreated hollow glass microspheres have poor compatibility with polyurethane matrix, resulting in uneven dispersion of fillers in the matrix, weak interfacial bonding, and easy stress concentration. This reduces the wear resistance, impact resistance, and long-term weather resistance of the flooring material. Furthermore, traditional solvent-based polyurethane flooring materials are harmful to the environment.
By surface modification of hollow glass microspheres, a mixture of nano-silica and specific isocyanate is used to form modified hollow glass microspheres. These microspheres are then combined with polyester polyols, curing agents, etc., to form a strong interfacial bond and hydrogen bond or network cross-linking structure, thereby improving compatibility.
It significantly improves the wear resistance, compressive strength and impact resistance of polyurethane flooring, gives it excellent weather resistance, and achieves lightweight and environmental protection, meeting the requirements of green building.
Smart Images
Figure CN121379338A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of surface modification technology for hollow glass microspheres, specifically to a polyurethane flooring containing modified hollow glass microspheres and its preparation method. Background Technology
[0002] Hollow glass microspheres (HGM) are hollow spherical materials made of borosilicate glass, characterized by low density, high strength, low thermal conductivity, and good chemical stability. Due to their unique structure, hollow glass microspheres are widely used as lightweight functional fillers in composite materials, coatings, plastics, and other fields, effectively reducing product density and improving their mechanical and thermal insulation properties.
[0003] Incorporating hollow glass microspheres into polyurethane flooring materials helps reduce the weight of the flooring system, improves material flowability and workability during construction, and, due to their high strength and rigidity, can enhance the mechanical properties of the flooring to some extent. However, untreated hollow glass microspheres have poor compatibility with the polyurethane matrix, resulting in uneven dispersion of the filler in the matrix, weak interfacial bonding, and a tendency to cause stress concentration, thereby reducing the flooring material's abrasion resistance, impact resistance, and long-term weather resistance. This defect limits the widespread application of hollow glass microspheres in high-performance polyurethane flooring.
[0004] Currently, most common polyurethane flooring materials use solvent-based systems. While they possess certain mechanical strength and durability, they easily release volatile organic compounds (VOCs) during production and construction, adversely affecting the environment and human health. With increasingly stringent environmental regulations and the promotion of green building concepts, developing environmentally friendly, high-performance polyurethane flooring systems has become an urgent need for the industry.
[0005] Therefore, how to effectively modify the surface of hollow glass microspheres to enhance their interfacial compatibility with polyurethane resin, thereby maintaining the lightweight properties of the material while further improving the wear resistance, weather resistance and overall service life of the flooring, has become an important research direction in this field. Summary of the Invention
[0006] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a polyurethane flooring containing modified hollow glass microspheres and its preparation method. By improving the compatibility between hollow glass microspheres and polyurethane through surface modification, the wear resistance and weather resistance of the polyurethane flooring are significantly improved.
[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A polyurethane flooring containing modified hollow glass microspheres, comprising the following raw materials in weight percentage: 60-75 parts polyester polyol, 25-30 parts curing agent, 6-15 parts modified hollow glass microspheres, 1-3 parts dispersant, 0.5-2 parts leveling agent, 1-2 parts defoamer, and 3-8 parts pigment; wherein the modified hollow glass microspheres are composed of hollow glass microspheres, nano-silica, and a surface modifier, and the surface modifier is composed of the following raw materials in weight percentage: a mixture of 2-3 parts polyol and 45-50 parts dimethyl sulfoxide, and a mixture of 4-10 parts isocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and 20-25 parts acetone.
[0008] Furthermore, the polyols include one or more of glycerol, polycarbonate diol, and polybutanediol.
[0009] Furthermore, the isocyanate is one of toluene diisocyanate, diphenylmethane diisocyanate, or hexamethylene diisocyanate.
[0010] Furthermore, the molar ratio of hydroxyl groups to isocyanate groups in polyols is 1:1.2-1.5.
[0011] Furthermore, the polyester polyol is polyester polyol 2150, and the curing agent is PM-200.
[0012] Furthermore, the weight percentage of nano-silica is 0.5-2 parts.
[0013] A method for preparing polyurethane flooring containing modified hollow glass microspheres, utilizing the aforementioned polyurethane flooring containing modified hollow glass microspheres, is as follows: S1. Preparation of modified hollow glass microspheres: A certain amount of hollow glass microspheres and nano-silica were added to polyol and dimethyl sulfoxide and stirred evenly; then, at a certain temperature, a mixed solution of isocyanate and acetone was added dropwise while stirring, and the reaction was carried out for a certain time; after the reaction was completed, the mixture was filtered and dried to obtain modified hollow glass microspheres. S2. Mix the polyester polyol and modified hollow glass microspheres evenly according to the weight parts. S3. Add dispersant, leveling agent, defoamer, and pigment to step S2 and disperse evenly; S4. Add curing agent to step S3, and mix evenly under vacuum to obtain the polyurethane flooring.
[0014] Furthermore, in step S1, the reaction temperature is 75-90℃ and the reaction time is 110-130 minutes.
[0015] Furthermore, in step S4, the reaction temperature is 15-35℃, and the mixture is stirred under vacuum for 1-3 minutes.
[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. Synergistic Improvement of Mechanical Properties and Durability: This invention uses modified hollow glass microspheres as fillers, which are mixed with polyester polyols and curing agents to form a strong interfacial bond. Through mutual penetration, entanglement, and the formation of hydrogen bonds or network cross-linked structures, the reinforcing effect of the filler is fully utilized. This not only significantly improves the wear resistance, compressive strength, and impact resistance of the flooring, but also endows it with excellent weather resistance, ensuring long-term and effective protection of the ground in various harsh environments.
[0017] 2. Lightweight and Energy-Saving Environmental Advantages: The inherent properties of the hollow glass microspheres in this invention enable the flooring material to achieve lightweighting while maintaining high strength. This not only reduces the weight of the product, facilitating construction and transportation (thereby reducing transportation energy consumption and carbon emissions), but its excellent thermal insulation performance also contributes to building energy conservation and meets green environmental protection requirements.
[0018] 3. Environmental friendliness: The materials used in this invention are non-toxic and harmless, and compared with traditional solvent-based flooring systems, the preparation process of this invention is more environmentally friendly. Attached Figure Description
[0019] Figure 1 This is a flowchart of a preferred embodiment of the present invention for preparing polyurethane flooring containing modified hollow glass microspheres. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0021] A polyurethane flooring containing modified hollow glass microspheres is composed of the following raw materials in weight percentages: 60-75 parts polyester polyol, 25-30 parts curing agent, 6-15 parts modified hollow glass microspheres, 1-3 parts dispersant, 0.5-2 parts leveling agent, 1-2 parts defoamer, and 3-8 parts pigment; wherein the modified hollow glass microspheres are composed of hollow glass microspheres, nano-silica, and a surface modifier, and the surface modifier is composed of the following raw materials in weight percentages: a mixture of 2-3 parts polyol and 45-50 parts dimethyl sulfoxide, and a mixture of 4-10 parts isocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and 20-25 parts acetone.
[0022] The polyols include one or more of glycerol, polycarbonate diol, and polybutanediol.
[0023] The isocyanate is one of toluene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate.
[0024] The molar ratio of hydroxyl groups to isocyanate groups in the polyol is 1:1.2-1.5.
[0025] The polyester polyol is polyester polyol 2150, and the curing agent is PM-200.
[0026] The nano-silica has a weight percentage of 0.5-2 parts.
[0027] like Figure 1 As shown, a method for preparing polyurethane flooring containing modified hollow glass microspheres includes the following steps: S1. Preparation of modified hollow glass microspheres: A certain amount of hollow glass microspheres and nano-silica were added to polyol and dimethyl sulfoxide and stirred evenly; then, at a certain temperature, a mixed solution of isocyanate and acetone was added dropwise while stirring, and the reaction was carried out for a certain time; after the reaction was completed, the mixture was filtered and dried to obtain modified hollow glass microspheres. S2. Mix the polyester polyol and modified hollow glass microspheres evenly according to the weight parts. S3. Add dispersant, leveling agent, defoamer, and pigment to step S2 and disperse evenly; S4. Add curing agent to step S3, and mix evenly under vacuum to obtain the polyurethane flooring.
[0028] In step S1, the reaction temperature is 75-90℃ and the reaction time is 110-130 minutes. In step S4, the reaction temperature is 15-35℃, and the mixture is stirred under vacuum for 1-3 minutes.
[0029] The following is a specific example: Example 1
[0030] A method for preparing polyurethane flooring containing modified hollow glass microspheres includes the following steps: 7 g of hollow glass microspheres were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 6.26 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0031] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring.
[0032] Examples 2-7 are similar to Example 1. By adjusting the amount and type of isocyanate and the type of polyol, polyurethane flooring under different modification conditions was prepared, and its wear resistance was tested. Detailed example data are provided below.
[0033] Examples 8-9 are similar to Example 1, but different amounts of nano-silica were added during the surface modification treatment of hollow glass microspheres to prepare polyurethane flooring under different modification conditions, and their wear resistance was tested. Detailed example data are provided below. Example 2
[0034] 7 g of hollow glass microspheres were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 5.22 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0035] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 3
[0036] 7 g of hollow glass microspheres were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 7.83 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0037] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 4
[0038] 7 g of hollow glass microspheres were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 11.25 g of diphenylmethane diisocyanate and 20 g of acetone was added dropwise at 80 °C. The reaction was carried out for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0039] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 5
[0040] 7 g of hollow glass microspheres were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 7.56 g of hexamethylene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0041] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 6
[0042] 7 g of hollow glass microspheres were dispersed in a mixture of 9.96 g of polycarbonate diol and 45 g of dimethyl sulfoxide. A mixture of 6.26 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0043] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 7
[0044] 7 g of hollow glass microspheres were dispersed in a mixture of 7.50 g of polybutanediol and 45 g of dimethyl sulfoxide. A mixture of 6.26 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0045] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 8
[0046] 7 g of hollow glass microspheres and 0.07 g of nano-silica were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 6.26 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0047] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Example 9
[0048] 7 g of hollow glass microspheres and 0.14 g of nano-silica were dispersed in a mixture of 2.76 g of glycerol and 45 g of dimethyl sulfoxide. A mixture of 6.26 g of toluene diisocyanate and 20 g of acetone was added dropwise at 80 °C. The mixture was reacted for 120 minutes, filtered, and dried to prepare modified hollow glass microspheres.
[0049] 65.0 g of polyester polyol 2150 and 6.5 g of modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Comparative Example 1
[0050] Based on Example 1, the only difference is the addition of unmodified hollow glass microspheres.
[0051] 65.0 g of polyester polyol 2150 and 6.5 g of unmodified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Comparative Example 2
[0052] Based on Example 1, the only difference is that hollow glass microspheres are not added.
[0053] Add 65.0g of polyester polyol 2150 to 2.0g of dispersant, 1.0g of leveling agent, 1.3g of defoamer and 1.3g of pigment, disperse evenly, and finally add 26.0g of curing agent PM-200. Mix evenly under vacuum to obtain the polyurethane flooring. Comparative Example 3
[0054] Based on Example 1, the only difference is that the hollow glass microspheres are surface modified with silane coupling agent KH-570.
[0055] 65.0 g of polyester polyol 2150 and 6.5 g of silane coupling agent modified hollow glass microspheres were stirred and mixed evenly. Then, 2.0 g of dispersant, 1.0 g of leveling agent, 1.3 g of defoamer and 1.3 g of pigment were added and dispersed evenly. Finally, 26.0 g of curing agent PM-200 was added and mixed evenly under vacuum to obtain the polyurethane flooring. Test Example 1
[0056] The polyurethane antistatic ultra-wear-resistant floor coatings prepared in the examples and comparative examples were applied to one side of a 100mm×100mm×40mm concrete substrate using a brush coating method. The dry film thickness was 1mm, resulting in 12 test panels, with 3 panels in each group. After curing at 25℃ and 50% humidity for 5 days, abrasion resistance tests were conducted. The coating surface should be smooth and flat, without obvious bubbles, cracks, or other defects. The test procedure followed the national standard GB / T 22374-2018 "Determination of Abrasion Resistance - Rotating Rubber Grinding Wheel Method" for floor coating materials.
[0057] Fix the test plate on the turntable, lower the friction head so that the rubber grinding wheel (model CS-17) is placed on the surface of the test plate, position the dust suction nozzle, and adjust the position of the dust suction nozzle so that it is 1 mm away from the surface of the disc; turn on the dust suction device and then start the turntable, rotate the rubber grinding wheel on the test plate 300 times, use lint-free paper to remove any loose abrasive residue remaining on the test plate, weigh the test plate again, and check whether the coating has been worn through; repeat the above steps on two other test plates and record the results, and take the average value of the test data.
[0058] The initial mass of the test plate before the weighing test was accurate to 0.1 mg and recorded as the initial mass. After the test, the average mass loss of the three test plates in the same group was calculated using the subtraction method, accurate to 1 mg. The test data are shown in Table 1.
[0059] Table 1
[0060] Through tests 1, Examples 2 and 3, the R value of the surface modifier was changed. The experimental results showed that if the polyurethane modifier is too soft or too hard, it will affect the wear resistance of the polyurethane flooring. Examples 1 and 4-5 used different isocyanates, and the tests showed that hollow glass microspheres modified with toluene diisocyanate had the greatest improvement on the wear resistance of polyurethane flooring. The test results of Examples 1 and 6-7 demonstrate that the use of glycerol-modified hollow glass microspheres has the greatest effect on improving the wear resistance of polyurethane flooring. The test results of Examples 1 and 8-9 further demonstrate that adding a small amount of nano-silica during the modification of hollow glass microspheres can improve the wear resistance of the modified hollow glass microspheres to polyurethane flooring. Comparative Examples 1, 2, and 3 show that adding unmodified hollow glass microspheres improves the wear resistance of polyurethane flooring. However, the compatibility of unmodified hollow glass microspheres and hollow glass microspheres modified with silane coupling agents with polyurethane is poor, and the improvement in wear resistance is not significant.
[0061] In summary, this invention optimizes the surface modification effect of hollow glass microspheres by adjusting the ratio of polyol and isocyanate, thereby significantly improving their compatibility with polyurethane.
[0062] The present invention uses polyurethane and inorganic nanomaterials to jointly modify the surface of hollow glass microspheres, thereby improving the wear resistance of the material.
[0063] The modified hollow glass microspheres of this invention significantly improve the wear resistance of polyurethane flooring, especially when modified with toluene diisocyanate and glycerol, where the improvement in wear resistance is most significant.
[0064] The modified hollow glass microspheres of this invention are non-toxic and harmless, meet modern environmental protection requirements, and do not sacrifice the mechanical properties of polyurethane after addition; on the contrary, they improve the properties such as compressive strength and impact resistance.
[0065] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.
[0066] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.
Claims
1. A polyurethane floor containing modified hollow glass microspheres, characterized in that, The polyurethane floor containing the modified hollow glass microbeads is prepared by the following steps: S1, preparation of the modified hollow glass microbeads: a certain amount of hollow glass microbeads and nanosilica are added into polyol and dimethyl sulfoxide and stirred uniformly; then a mixed solution of isocyanate and acetone is added drop by drop while stirring at a certain temperature, and the reaction is carried out for a certain time; after the reaction is completed, the product is filtered and dried to obtain the modified hollow glass microbeads; S2, the polyester polyol and the modified hollow glass microbeads are mixed uniformly according to the weight parts; S3, the dispersing agent, the leveling agent, the defoaming agent and the pigment are added into step S2 and dispersed uniformly; S4, the curing agent is added into step S3, and the mixture is stirred uniformly under vacuum to obtain the polyurethane floor.
2. The polyurethane floor containing modified hollow glass microspheres according to claim 1, characterized by: The polyol includes one or more of glycerol, polycarbonate diol and polybutylene glycol.
3. The polyurethane floor containing modified hollow glass microspheres according to claim 2, characterized by: The isocyanate is one of toluene diisocyanate, diphenyl methane diisocyanate and hexamethylene diisocyanate.
4. The polyurethane floor containing modified hollow glass microspheres according to claim 3, characterized by: The molar ratio of the hydroxyl group in the polyol to the isocyanate group is 1:1.2-1.
5.
5. The polyurethane floor containing modified hollow glass microspheres according to claim 1, characterized by: The polyester polyol is polyester polyol 2150, and the curing agent is PM-200.
6. The polyurethane floor containing modified hollow glass microspheres according to claim 1, characterized by: The weight percentage of the nanosilica is 0.5-2 parts.
7. A method for preparing a polyurethane floor containing modified hollow glass microspheres, characterized by: The polyurethane floor containing the modified hollow glass microbeads is prepared by the following steps: S1, preparation of the modified hollow glass microbeads: a certain amount of hollow glass microbeads and nanosilica are added into polyol and dimethyl sulfoxide and stirred uniformly; then a mixed solution of isocyanate and acetone is added drop by drop while stirring at a certain temperature, and the reaction is carried out for a certain time; after the reaction is completed, the product is filtered and dried to obtain the modified hollow glass microbeads; S2, the polyester polyol and the modified hollow glass microbeads are mixed uniformly according to the weight parts; S3, the dispersing agent, the leveling agent, the defoaming agent and the pigment are added into step S2 and dispersed uniformly; S4, the curing agent is added into step S3, and the mixture is stirred uniformly under vacuum to obtain the polyurethane floor. The reaction temperature in step S1 is 75-90°C, and the reaction time is 110-130 minutes. The reaction temperature in step S4 is 15-35°C, and the stirring time under vacuum is 1-3 minutes. 8. The method of claim 7, wherein the modified hollow glass microsphere-containing polyurethane floor is prepared by the steps of: (a) mixing the modified hollow glass microsphere-containing polyurethane floor material with a solvent; (b) applying the mixed material to a floor surface; (c) drying the mixed material; and (d) curing the dried mixed material. 9. The method of claim 7, wherein the modified hollow glass microsphere-containing polyurethane floor is prepared by the steps of: (a) mixing the modified hollow glass microsphere-containing polyurethane floor material with a solvent; (b) applying the mixed material to a floor surface; (c) drying the mixed material; and (d) curing the dried mixed material.