Prefabricated polyurethane runway coiled material and preparation method thereof

Abstract

The invention provides a prefabricated polyurethane runway coiled material and a preparation method thereof. The coiled material is prepared from the following raw materials: polyether polyol, thixotropic powder, isocyanate, a chain extender, organic hollow microspheres, a plasticizer, an inorganic filler and the like. The material disclosed by the invention has excellent physical and mechanical properties and a quantitative closed microporous structure, the material consumption is saved, and the product has high dimensional stability and wear resistance.

Description

Technical Field

[0001] The present invention belongs to the field of polyurethane materials, and particularly relates to a prefabricated polyurethane runway coil and a preparation method thereof. Technical Background

[0002] In recent years, the use of polyurethane plastic materials has become more and more common, and the laying sites include stadiums, schools, public fitness places, etc. The plastic materials have a certain hardness and good flatness. Introducing a closed microporous structure therein can absorb vibrations, achieve a buffering effect, and increase the thickness of the plastic, reducing the material consumption.

[0003] The laying of traditional polyurethane plastic sites generally adopts the on-site construction method. During the construction process, the operator needs to mix materials at the construction site. During the operation of mixing materials, the ratio of the two components is prone to errors, resulting in a decline in material quality and even the consequence of non-curing; on-site construction is greatly affected by environmental temperature and humidity, and it is difficult to construct in extreme weather such as rain and cold environments, restricting the laying effect and efficiency of polyurethane plastic sites.

[0004] Most of the polyurethane prefabricated runway materials are rubber materials, and the wear resistance is much lower than that of polyurethane materials; the current polyurethane prefabricated runway materials are of integral foaming structure, resulting in a decrease in surface strength, easy damage, and reduced service life of the materials.

[0005] CN110540674A discloses a solvent-free foaming prefabricated plastic runway, which uses water as a foaming agent to prepare a plastic material with a foam structure. Although water as a foaming agent is environmentally friendly, the foaming foam structure is difficult to control, and partial open-cell structures will be generated, resulting in a "water seepage" phenomenon, affecting the service life of the material; at the same time, this type of closed-cell structure is generated by carbon dioxide generated by water foaming and has no support structure. With the movement of polyurethane chain segments and temperature changes, thermal expansion and contraction will occur, and the macroscopic manifestation is the "edge warping" of the prefabricated runway product, which is a common problem in the industry.

[0006] CN201810219861.7 discloses a thermoplastic foamed particle-filled plastic runway, which uses thermoplastic materials to foam and granulate, and is formed by molding or gluing with glue. Using it alone cannot achieve the effect, and it is necessary to bond a surface layer such as a cast-in-place surface layer or a spray self-texturing surface layer on the surface to obtain sufficient wear resistance. It is an approximate semi-prefabricated material, and the subsequent construction of the veneer is still restricted by on-site construction batching and climate, and the stability of the finished product cannot be guaranteed.

[0007] Therefore, it is very necessary to provide a prefabricated plastic material with a stable closed-cell structure and integrally formed laying. Summary of the Invention

[0008] One of the objectives of the present invention is to provide a prefabricated polyurethane microporous runway coil. In view of the current situation of existing prefabricated plastic runways: no foaming structure or open-cell foaming causing pore reduction and shortened service life, the problem of product shrinkage cannot be solved, and the product surface is prone to wear. The present invention provides a prefabricated polyurethane plastic runway coil with a simple molding method and a stable closed microporous structure. The material has excellent physical and mechanical properties and a quantitative closed microporous structure, saving material usage, and the product has high dimensional stability and wear resistance.

[0009] To achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions:

[0010] A prefabricated polyurethane microporous runway coil, the coil is prepared from raw materials comprising the following parts by mass:

[0011]

[0012] The present invention is different from traditional prefabricated coils. It does not use chemical blowing agents and special composite sandwich processes ("popcorn" sandwich). A quantitative closed-cell foam structure is evenly distributed in the coil, effectively increasing the thickness and elasticity of the coil. During the product preparation process, a large number of hydrogen bonds are formed in the system by adding thixotropic powder to obtain a static high-viscosity B component. After the microspheres are heated and foamed, they are evenly distributed in the system and will not float on the surface in large quantities; aliphatic diols and low-reactivity amine chain extenders are built into the B component. After mixing with the A component, the amine chain extender reacts with the isocyanate first, encapsulating the microsphere structure in the system and simultaneously destroying the original hydrogen bonds in the system, and the thixotropy gradually disappears, ensuring that the surface of the mixture is fully leveled.

[0013] In an embodiment of the present invention, the polyether polyol is polytetrahydrofuran ether diol and / or hydroxyl-terminated polyether polyol; preferably, the molecular weight of the polyether polyol is 1000-6000; preferably, the hydroxyl-terminated polyether polyol is polymerized from one or more of propylene oxide, ethylene oxide, tetrahydrofuran, trimethylolpropane, glycerol, and ethylene glycol.

[0014] In an embodiment of the present invention, the thixotropic powder is a filler with the effect of forming weak hydrogen bonds to trigger thixotropy, preferably one or more of attapulgite, bentonite, and fumed silica.

[0015] In an embodiment of the present invention, the isocyanate is one or more of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,4-toluene diisocyanate.

[0016] In one embodiment of the present invention, the chain extender is a mixture of an amine chain extender and a small molecule alcohol chain extender; preferably, the mass ratio of the amine chain extender to the small molecule alcohol chain extender in the mixture is 1:(2-5); preferably, the amine chain extender is a low-activity aromatic diamine compound, preferably one or more of 3,5-diethyltoluenediamine, 4,4'-bis(sec-butylamino)-diphenylmethane, and 4,4'-methylenebis(3-chloro-2,6-diethylaniline); preferably, the small molecule alcohol chain extender is an aliphatic diol, preferably one or more of ethylene glycol, diethylene glycol, and 1,4-butanediol.

[0017] In one embodiment of the present invention, the hollow microspheres are thermoplastic microspheres; preferably, the hollow microspheres have a core-shell structure, the outer shell is a thermoplastic polymer, the inner core is filled with gas, and the volume can expand to form closed-cell foam after heating.

[0018] In one embodiment of the present invention, the plasticizer has a boiling point higher than 130° C., and is preferably one or more of chlorinated paraffin, terephthalate, epoxidized soybean oil, and chlorinated palm oil.

[0019] In one embodiment of the present invention, the wetting and dispersing agent is an anti-settling type dispersant, preferably one or more of a high molecular weight copolymer containing pigment affinity groups, a polycarboxylic acid ester, and a modified polysiloxane solution.

[0020] In one embodiment of the present invention, the inorganic filler is an inorganic powder with a mesh size of 400 or more, preferably one or more of calcium carbonate, kaolin, talc, white carbon black, and titanium dioxide.

[0021] In one embodiment of the present invention, the colorant is a dye powder, preferably one or more of red iron oxide, phthalocyanine green, and permanent red.

[0022] In one embodiment of the present invention, the antioxidant is a hindered phenol antioxidant, preferably one or more of 3,5-di-tert-butyl-4-hydroxyphenylpropionate, 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0023] Another object of the present invention is to provide a method for preparing a prefabricated polyurethane microporous runway coil.

[0024] A method for preparing a prefabricated polyurethane microporous runway coil, wherein the coil is the coil described in any one of claims 1 to 7, and the preparation method comprises the following steps:

[0025] S1: prepolymerization of polyether polyol and isocyanate to obtain material A;

[0026] S2: The dehydrated polyether polyol, chain extender, powder, plasticizer, functional additive, thixotropic powder, and anti-aging additive are added to the organic hollow microspheres and dispersed to obtain Material B.

[0027] S3: Mix Material A and Material B, pour and form into sheets, cure and foam, and wind up.

[0028] In one embodiment of the present invention, the prepolymerization temperature in S1 is 70 - 90°C, and the time is 2 - 4 h.

[0029] In one embodiment of the present invention, the temperature of the system when adding the organic hollow microspheres in S2 is 60 - 70°C.

[0030] In one embodiment of the present invention, the curing and foaming temperature in S3 is 80 - 120°C, and the time is 1 - 2 h.

[0031] Another object of the present invention is to provide a use of a prefabricated polyurethane microporous runway coil.

[0032] A use of a prefabricated polyurethane microporous runway coil, where the coil is the above-mentioned coil or the coil prepared by the above-mentioned preparation method, and the coil is used for laying sports fields.

[0033] In the present invention, by adding organic hollow microspheres, a closed microporous structure is generated in the matrix by physical foaming, which can effectively improve the number of foams and the certainty of foam morphology. Adding a fixed proportion of organic microspheres ensures extremely high product stability of coil products in different batches; using thixotropic powder to endow the liquid with thixotropy ensures that although the viscosity is low when the material temperature is high, there is thixotropy. In the initial stage of the reaction, after the microspheres expand, they are evenly distributed in the matrix and do not float. As the reaction proceeds, the amine chain extender and isocyanate form strong hydrogen bonds, destroying the weak hydrogen bond structure formed by the thixotropic powder, and the thixotropy disappears with the progress of the reaction, without affecting the material leveling. At this time, the cross-linked structure in the system is formed, fixing the foaming microspheres and ensuring the uniform distribution of the microspheres in the matrix; during the curing process by oven heating after forming into sheets, the organic microspheres foam after reaching the expansion temperature, and the foaming structure is fixed after cooling. Supported by a high-strength outer shell, it will not expand and contract due to heat, maintaining the dimensional stability of the material.

[0034] Compared with the prior art, the positive effects of the present invention are as follows:

[0035] (1) Without using traditional water foaming agents, it is ensured that all foam structures are closed cells, avoiding water seepage problems caused by site damage.

[0036] (2) By the generation and disappearance of thixotropy, it is ensured that the microsphere structure is evenly distributed in the system, obtaining a paving product with stable appearance and performance.

[0037] (3) The preparation and processing process is simple. There is no need for the lamination process of different structural layers, and the finished product can be obtained by one-time casting and curing. Detailed implementation manners

[0038] The principles and features of the present invention will be described below in conjunction with specific embodiments. The described embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0039] The summary of the raw material abbreviations, sources and substance names involved in the present invention is as follows:

[0040] 3135: Polyether triol with a molecular weight of 6000 - 6500, purchased from Wanhua Chemical Co., Ltd.

[0041] 2020: Polyether diol with a molecular weight of 2000, purchased from Wanhua Chemical Co., Ltd.

[0042] 2010: Polyether diol with a molecular weight of 1000, purchased from Wanhua Chemical Co., Ltd.

[0043] PTMG2000: Polyether diol with a molecular weight of 2000, purchased from Wanhua Chemical Co., Ltd.

[0044] TDI-80: A mixture of 2,4-toluene diisocyanate with a mass content of 80% and 2,6-toluene diisocyanate with a mass content of 20%, purchased from Wanhua Chemical Co., Ltd.

[0045] MDI-50: A blend of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate, purchased from Wanhua Chemical Co., Ltd.

[0046] Bentonite: Purchased from Fengxing Chemical Trading Co., Ltd.

[0047] Attapulgite: 325 mesh, purchased from Mingmei Mineral Chemical Co., Ltd.

[0048] 120DU25: Organic hollow microspheres, purchased from Polychem Company, USA

[0049] JH-PG12: Organic hollow microspheres, purchased from Beijing Yijin Technology Co., Ltd.

[0050] MS140W: Organic hollow microspheres, purchased from Beijing Yijin Technology Co., Ltd.

[0051] DEG: Diethylene glycol, alias diglycol, purchased from Huntsman Company, USA

[0052] BDO: 1,4-butanediol, purchased from Wanhua Chemical Co., Ltd.

[0053] DETDA: 3,5 - Diethyltoluenediamine, purchased from Zibo Fangzhong Chemical Co., Ltd.

[0054] 6200: 4,4’ - Bis(sec - butylamino) - diphenylmethane, purchased from Wanhua Chemical Co., Ltd. M - CDEA: 4,4’ - Methylenebis(3 - chloro - 2,6 - diethylaniline), purchased from Chemical Raw Materials Co., Ltd. in Kunshan City, Jiangsu Province

[0055] BYK - W961: Wetting and dispersing agent, propylene glycol solution of polycarboxylic acid - alkyl ammonium salt, purchased from BYK Chemie GmbH in Germany

[0056] 7066: Wetting and dispersing agent, high - molecular - weight polymer, purchased from Guangzhou Slokchem Co., Ltd.

[0057] 1010: High - molecular - weight hindered phenol antioxidant, pentaerythritol tetra[β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionate], purchased from Qingdao Haida Chemical Co., Ltd.

[0058] 1135: Liquid hindered phenol antioxidant, isooctyl 3,5 - di - tert - butyl - 4 - hydroxyphenylpropionate, purchased from Shanghai Xiuyuan Chemical Co., Ltd. PC - 03S: Catalyst, zinc - bismuth complex catalyst, purchased from Shanghai Zhengui Technology Co., Ltd.

[0059] PC - 03S: Catalyst, zinc - bismuth complex catalyst, purchased from Shanghai Zhengui Technology Co., Ltd.

[0060] T - 12: Catalyst, dibutyltin dilaurate, purchased from Shanghai Minchen Chemical Industry.

[0061] Equipment: For laboratory preparation, a 40×30×1 cm open - top silica gel mold was selected.

[0062] Example 1

[0063] The preparation method of the polyurethane plastic material is as follows:

[0064] (1) After dehydration, 37.07 g of polyether polyol 3135 and 15.6 g of polyether polyol 2020 were put into the reaction kettle and heated to 50°C; then 30.42 g of MDI - 50 was added and reacted at 80°C for 2 h, followed by vacuum degassing for 0.5 h to obtain Material A;

[0065] (2) 10 g of polyether polyol 3135, 5 g of polyether polyol 2020, 2 g of bentonite, 1.2 g of DEG, 0.4 g of DETDA, 12 g of chlorinated paraffin, 30 g of calcium carbonate, 0.3 g of iron oxide red, 0.5 g of 7066, 0.2 g of 1010, and 0.01 g of T - 12 were vacuum - dehydrated at 120°C for 2 h until no bubbles were generated; the temperature was lowered to 60°C, and 0.2 g of 120DU25 was added and dispersed for another 30 min to obtain Material B;

[0066] (3) Mix Material A and Material B in a mass ratio of 1 / 6, pour 10 g to form a sheet, and then cure and foam in an oven at 100 °C for 1.5 h. Take it out to obtain Specimen 1.

[0067] Example 2

[0068] The preparation method of the polyurethane plastic material in this example is as follows:

[0069] (1) Respectively put 37 g of polyether polyol 3135 and 16 g of polyether polyol 2020 into the reaction kettle and heat up to 55 °C; then add 30 g of MDI-50 and react at 75 °C for 2.5 h, and carry out vacuum degassing for 0.5 h to obtain Material A;

[0070] (2) Respectively put 10 g of polyether polyol 3135, 5 g of polytetrahydrofuran ether diol PTMG2000, 4 g of attapulgite, 1.2 g of BDO, 0.6 g of 6200, 8 g of chlorinated paraffin, 4 g of terephthalate, 30 g of talc powder, 0.25 g of phthalocyanine green, 1 g of 7066, 0.2 g of 1135, and 0.02 g of PC-03S in a vacuum at 110 °C for 3 h until no bubbles are generated; cool down to 65 °C and add 0.35 g of JH-PG12 and continue to disperse for 30 min to obtain Material B;

[0071] (3) Mix Material A and Material B in a mass ratio of 1 / 5, pour 10 g to form a sheet, and then cure and foam in an oven at 85 °C for 2 h. Take it out to obtain Specimen 2.

[0072] Example 3

[0073] The preparation method of the polyurethane plastic material in this example is as follows:

[0074] (1) Respectively put 38.6 g of polyether polyol 3135 and 15 g of polytetrahydrofuran ether diol PTMG2000 into the reaction kettle and heat up to 60 °C; then add 10 g of TDI-80 and react at 90 °C for 1.5 h, and then add 20 g of MDI-50 and react at 80 °C for 1 h, and carry out vacuum degassing for 0.5 h to obtain Material A;

[0075] (2) Respectively put 10 g of polyether polyol 3135, 5 g of polyether polyol 2020, 4 g of attapulgite, 1.2 g of DEG, 0.3 g of M-CDEA, 12 g of epoxy soybean oil, 30 g of kaolin, 0.3 g of permanent red, 0.5 g of BYK-W961, 0.2 g of 1135, and 0.02 g of T-12 in a vacuum at 110 °C for 3 h until no bubbles are generated; cool down to 60 °C and add 0.25 g of MS140W and continue to disperse for 30 min to obtain Material B;

[0076] (3) Mix Material A and Material B in a mass ratio of 1 / 5, pour 10 g to form a sheet, and cure and foam it in an oven at 115 °C for 1 h, then take it out to obtain Specimen 3.

[0077] Comparative Example 1

[0078] Compared with Example 1, the difference is that no thixotropic powder is added, and others are the same.

[0079] The preparation method of the polyurethane plastic material in this comparative example is as follows:

[0080] (1) Respectively put 37.07 g of polyether polyol 3135 and 15.6 g of polyether polyol 2020 into the reaction kettle and heat up to 50 °C; then add 30.42 g of MDI-50 and react at 80 °C for 2 h, and carry out vacuum degassing for 0.5 h to obtain Material A;

[0081] (2) Respectively put 10 g of polyether polyol 3135, 5 g of polyether polyol 2020, 1.2 g of DEG, 0.4 g of DETDA, 12 g of chlorinated paraffin, 30 g of calcium carbonate, 0.3 g of iron oxide red, 0.5 g of 7066, 0.2 g of 1010, 0.01 g of T-12 under the condition of 120 °C and carry out vacuum dehydration for 2 h until no bubbles are generated; cool down to 60 °C and add 0.2 g of 120DU25 and continue to disperse for 30 min to obtain Material B;

[0082] (3) Mix Material A and Material B in a mass ratio of 1 / 6, pour 10 g to form a sheet, and cure and foam it in an oven at 100 °C for 1.5 h, then take it out to obtain Specimen 4.

[0083] Comparative Example 2

[0084] Compared with Example 2, the difference is that no amine chain extender is added, and others are the same. The preparation method of the polyurethane plastic material in this comparative example is as follows:

[0085] (1) Respectively put 37 g of polyether polyol 3135 and 16 g of polyether polyol 2020 into the reaction kettle and heat up to 55 °C; then add 30 g of MDI-50 and react at 75 °C for 2.5 h, and carry out vacuum degassing for 0.5 h to obtain Material A;

[0086] (2) Respectively put 10 g of polyether polyol 3135, 5 g of polytetrahydrofuran ether glycol PTMG2000, 4 g of attapulgite, 1.2 g of BDO, 8 g of chlorinated paraffin, 4 g of terephthalate, 30 g of talc powder, 0.25 g of phthalocyanine green, 1 g of 7066, 0.2 g of 1135, 0.02 g of Pc-03S under the condition of 110 °C and carry out vacuum dehydration for 3 h until no bubbles are generated; cool down to 65 °C and add 0.35 g of JH-PG12 and continue to disperse for 30 min to obtain Material B;

[0087] (3) Mix Material A and Material B in a mass ratio of 1 / 5, pour 10 g to form a sheet, and cure and foam it in an oven at 85 °C for 2 h, then take it out to obtain Specimen 5.

[0088] Comparative Example 3

[0089] Compared with Example 3, the difference is that microspheres are not added, and others are the same.

[0090] (1) Respectively put 38.6 g of polyether polyol 3135 and 15 g of polytetrahydrofuran ether diol PTMEG2000 into a reaction kettle and heat up to 60 °C; then add 10 g of TDI-80 and react at 90 °C for 1.5 h, then add 20 g of MDI-50 and react at 80 °C for 1 h, and carry out vacuum degassing for 0.5 h to obtain Material A;

[0091] (2) Respectively put 10 g of polyether polyol 3135, 5 g of polyether polyol 2020, 4 g of attapulgite, 1.2 g of DEG, 0.3 g of M-CDEA, 12 g of epoxidized soybean oil, 30 g of kaolin, 0.3 g of permanent red, 0.5 g of BYK-W961, 0.2 g of 1135, and 0.01 g of T-12 into a vacuum dehydration for 3 h at 110 °C until no bubbles are generated; cool down to 60 °C to obtain Material B;

[0092] (3) Mix Material A and Material B at 60 °C in a mass ratio of 1 / 5, pour 10 g to form a sheet, and cure and foam it in an oven at 115 °C for 1 h, then take it out to obtain Specimen 6.

[0093] Testing method:

[0094] 1. Levelling property: Visual method: Observe the surface flatness of the prepared specimen. If there are flow marks, it is poor; if it is smooth and flat, it is excellent;

[0095] 2. Tensile strength: Test according to standard GB / T 528-2009, pulling speed 100 mm / min;

[0096] 3. Abrasion resistance: Test according to standard GB / T 9867-2008;

[0097] 4. Impact absorption: Test according to standard GB / T36246-2018, and the impact absorption requirement is more than 33%;

[0098] Table 1

[0099]

[0100]

[0101] In each comparative example, due to the lack of a key component, it is difficult to form a synergistic effect, resulting in poor physical properties of the specimens.

[0102] In Comparative Example 1, thixotropic powder was not used. After casting, the temperature of the liquid material was relatively high and the viscosity was very low in the early stage of the reaction. Due to the relatively low density of the microspheres, they would migrate to the top of the diaphragm, causing the microspheres to float. After curing, the distribution of the microspheres was uneven, and the content of microspheres at the pattern at the bottom of the mold was small, resulting in a reduction in impact absorption.

[0103] In Comparative Example 2, due to the thixotropy of the liquid material during the reaction and the use of a small molecule alcohol chain extender, strong hydrogen bonds could not be formed to destroy the thixotropy, and the surface was difficult to level.

[0104] In Comparative Example 3, hollow microspheres were not used. After high-temperature curing, it was a dense elastic structure with high hardness, and the impact absorption could not meet the standard.

[0105] The physical and mechanical properties of the coil of the present invention exceed the national standard and are higher than those of the vast majority of commercially available products. The fully closed-cell structure can completely avoid the problem of water seepage of the material, has good wear resistance, and improves the service life of the site; the production equipment and process are simple, and the low density saves the material consumption.

[0106] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A prefabricated polyurethane microporous runway coil, characterized in that, the coil is prepared from raw materials comprising the following parts by mass:

2. The coil according to claim 1, characterized in that, the polyether polyol is polytetrahydrofuran ether diol and / or hydroxyl-terminated polyether polyol; preferably, the molecular weight of the polyether polyol is 1000 - 7000; preferably, the hydroxyl-terminated polyether polyol is polymerized from one or more of propylene oxide, ethylene oxide, tetrahydrofuran, trimethylolpropane, glycerol, and ethylene glycol.

3. The coil according to claim 1 or 2, characterized in that, the thixotropic powder is a filler with the effect of forming weak hydrogen bonds to cause thixotropy, preferably one or more of attapulgite, bentonite, and fumed silica.

4. The coil according to any one of claims 1 - 3, characterized in that, the isocyanate is one or more of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,4-toluene diisocyanate.

5. The coil according to any one of claims 1 - 4, characterized in that, the chain extender is a mixture of an amine chain extender and a small molecule alcohol chain extender; preferably, the mass ratio of the amine chain extender to the small molecule alcohol chain extender in the mixture is 1:(2 - 5); preferably, the amine chain extender is a low-activity aromatic diamine compound, preferably one or more of 3,5-diethyltoluenediamine, 4,4'-bis(sec-butylamino)-diphenylmethane, and 4,4'-methylenebis(3-chloro-2,6-diethylaniline); preferably, the small molecule alcohol chain extender is an aliphatic diol, preferably one or more of ethylene glycol, diethylene glycol, and 1,4-butanediol.

6. The coil according to any one of claims 1 - 5, characterized in that, the hollow microspheres are thermoplastic microbeads; preferably, the hollow microspheres have a core-shell structure, the outer shell is a thermoplastic polymer, the inner core is filled with gas, and the volume can expand to form a closed-cell foam after heating.

7. The coil according to any one of claims 1 - 6, characterized in that, the plasticizer has a boiling point higher than 130°C, preferably one or more of chlorinated paraffin, terephthalate, epoxy soybean oil, and chlorinated palm oil; and / or, the wetting and dispersing agent is an anti-settling dispersing agent, preferably one or more of a high molecular weight copolymer containing a pigment affinity group, a polycarboxylate ester, and a modified polysiloxane solution; and / or, the inorganic filler is an inorganic powder with a mesh number above 400, preferably one or more of calcium carbonate, kaolin, talc powder, white carbon black, and titanium dioxide; and / or, the colorant is a dyed powder, preferably one or more of iron oxide red, phthalocyanine green, and permanent red; and / or, the antioxidant is a hindered phenol antioxidant, preferably one or more of octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, isooctyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, and pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; and / or, the catalyst is an organometallic catalyst.

8. A preparation method of a prefabricated polyurethane microporous runway coil, wherein the coil is the coil described in any one of claims 1-7, characterized in that, the preparation method comprises the following steps: S1: Prepolymerize polyether polyol and isocyanate to obtain material A; S2: Add dehydrated polyether polyol, chain extender, powder, plasticizer, functional auxiliary agent, thixotropic powder and aging auxiliary agent into organic hollow microspheres and disperse to obtain material B; S3: Mix and pour materials A and B into sheets, cure and foam, and wind up.

9. According to the preparation method described in claim 8, characterized in that, in S1, the prepolymerization temperature is 70-90°C and the time is 2-4 h; and / or, in S2, the temperature of the system when adding organic hollow microspheres is 60-70°C; and / or, in S3, the curing and foaming temperature is 80-120°C and the time is 1-2 h.

10. A use of a prefabricated polyurethane microporous runway coil, wherein the coil is the coil described in any one of claims 1-7, or the coil prepared by the preparation method described in claim 8 or 9, characterized in that, the coil is used for laying sports venues.

Images