PU-FC runway material with high mechanical strength and preparation method thereof

Abstract

The invention relates to the technical field of polyurethane, and discloses a PU-FC runway material with high mechanical strength and a preparation method thereof.The PU-FC runway material comprises a PU polyurethane runway material with high mechanical strength and an FC water-based fluorocarbon coating, and the PU polyurethane runway material with high mechanical strength comprises a prepolymer and a curing agent; the prepolymer comprises 100 parts by weight of polyether polyol and 90-130 parts by weight of an isocyanate compound; the curing agent comprises 140-165 parts by weight of polyether polyol, 6-12 parts by weight of a chain extender, 2-8 parts by weight of modified polyacrylonitrile fibers and the like. The surface of the modified polyacrylonitrile fiber contains a large number of carbamate groups, so that the compatibility between the polyacrylonitrile fiber and polyurethane is good, the carbamate groups, carboxyl groups, amido bonds and the like on the surface of the polyacrylonitrile fiber have strong hydrogen-bond interaction with the polyurethane, and the interface bonding force between the carbamate groups, carboxyl groups, amido bonds and the like is improved; the polyacrylonitrile fiber has a better reinforcing effect, and the tensile property, the shore A hardness and the tearing strength of the polyurethane material are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurethane, and specifically relates to a PU-FC runway material with high mechanical strength and a preparation method thereof. Background Art

[0002] Polyurethane has good properties such as elasticity, impact resistance, wear resistance, and aging resistance, and is widely used in plastics, runways, sports equipment, etc. Traditional polyurethane materials for runways have relatively low mechanical strength, and there will be phenomena such as damage and cracks during long-term use, reducing the service life. Improving the mechanical properties of polyurethane materials for runways is a research hotspot, and usually inorganic fillers, polymer fibers, etc. are added to the polyurethane materials.

[0003] Polyacrylonitrile fiber has excellent weather resistance, mechanical strength and modulus, and is widely used in materials such as plastics, rubber, and concrete. The patent with the publication number CN108017897B discloses a polyacrylonitrile nanofiber membrane / thermoplastic polyurethane composite material and a preparation method thereof. Using the polyacrylonitrile nanofiber membrane as a reinforcing body, the thermoplastic polyurethane composite material prepared by the impregnation method has characteristics such as high tension, tensile strength, elongation at break, and toughness. However, the compatibility between ordinary polyacrylonitrile fiber and polyurethane is poor, and it is difficult to effectively exert the reinforcing effect of the fiber. Summary of the Invention

[0004] The present invention solves the problem of relatively low mechanical properties of polyurethane runway materials.

[0005] The technical solution of the present invention: A PU-FC runway material with high mechanical strength and a preparation method thereof: The PU-FC runway material includes a high mechanical strength PU polyurethane runway material and an FC waterborne fluorocarbon coating;

[0006] The high mechanical strength PU polyurethane runway material includes a prepolymer component and a curing agent component; The prepolymer component includes 100 parts by weight of polyether polyol and 90-130 parts by weight of isocyanate compound; The curing agent component includes 140-165 parts by weight of polyether polyol, 6-12 parts by weight of chain extender, 15-30 parts by weight of plasticizer, 1.4-1.8 parts by weight of catalyst, 20-40 parts by weight of filler, and 2-8 parts by weight of modified polyacrylonitrile fiber.

[0007] The preparation method of the PU-FC runway material with high mechanical strength is as follows:

[0008] (1) React dry polyether polyol and isocyanate compound in a nitrogen atmosphere at 70-80 °C for 2-3 h, cool and discharge to obtain the prepolymer component.

[0009] (2) Mix polyether polyol, chain extender, plasticizer, catalyst, filler, and modified polyacrylonitrile fiber, grind evenly to obtain the curing agent component; then mix the curing agent component and the prepolymer component, quickly pour into a mold, and cure at 20 - 35 °C for 18 - 24 h to obtain a high mechanical strength PU polyurethane runway material.

[0010] (3) Spray FC waterborne fluorocarbon coating on the surface of the high mechanical strength PU polyurethane runway material, and cure thermally to obtain a high mechanical strength PU-FC runway material.

[0011] Preferably, the isocyanate compound is toluene diisocyanate or diphenylmethane diisocyanate.

[0012] Preferably, the chain extender is 1,4-butanediol, 1,6-hexanediol or diethanolamine.

[0013] Preferably, the catalyst is any one or combination of lead isooctanoate or phenylmercuric acetate.

[0014] Preferably, the plasticizer is bis(2-ethylhexyl) phthalate, dioctyl phthalate or dibutyl phthalate.

[0015] Preferably, the filler is calcium carbonate, talcum powder or montmorillonite.

[0016] Preferably, the preparation method of the modified polyacrylonitrile fiber is as follows:

[0017] (1) Add polyacrylonitrile fiber to an aqueous sodium hydroxide solution with a mass fraction of 7 - 12%, heat to 60 - 80 °C, react for 10 - 15 min, add hydrochloric acid to adjust the pH to 5 - 6, filter, wash with water, and dry to obtain hydrolyzed polyacrylonitrile fiber.

[0018] (2) Add N-Boc-serinol and benzyl isocyanate with a molar ratio of 1:(2 - 2.2) to dichloromethane, react at 30 - 40 °C for 4 - 6 h, rotary evaporate, wash with petroleum ether, add the intermediate to dichloromethane, dropwise add trifluoroacetic acid, react at 20 - 25 °C for 5 - 8 h, add an aqueous sodium bicarbonate solution, shake and let stand for liquid separation, remove the aqueous phase, collect the dichloromethane extract, rotary evaporate, and recrystallize the product in ethanol to obtain 2-amino-1,3-propanediol dicarbamate. The reaction formula is:

[0019]

[0020] (3) Add 100 parts by weight of hydrolyzed polyacrylonitrile fiber, 6 - 20 parts by weight of 2 - amino - 1,3 - propanediol dicarbamate, 3.8 - 12.6 parts by weight of dicyclohexylcarbodiimide, and 0.4 - 1.2 parts by weight of 4 - dimethylaminopyridine to N,N - dimethylformamide. Heat to 70 - 85 °C, stir and react for 3 - 8 h, filter, wash successively with ethanol and water, and dry to obtain modified polyacrylonitrile fiber.

[0021] Beneficial technical effects of this aspect: In the present invention, dicyclohexylcarbodiimide and 4 - dimethylaminopyridine are used as catalysts to carry out an amidation reaction between the carboxyl groups on the surface of hydrolyzed polyacrylonitrile fiber and the amino groups of 2 - amino - 1,3 - propanediol dicarbamate, thereby introducing a large number of urethane groups on the surface of polyacrylonitrile fiber. Finally, it is blended and cured with the prepolymer composition and curing agent components to obtain a PU polyurethane runway material with high mechanical strength.

[0022] The surface of the modified polyacrylonitrile fiber of the present invention contains a large number of urethane groups, resulting in good compatibility between the polyacrylonitrile fiber and polyurethane. The polyacrylonitrile fiber is uniformly dispersed in the polyurethane material. At the same time, there are strong hydrogen bond interactions between the urethane groups, carboxyl groups, amide bonds, etc. on the surface of the polyacrylonitrile fiber and polyurethane, improving the interfacial bonding force between the two, enabling the polyacrylonitrile fiber to play a better reinforcing role, and significantly improving the tensile properties, Shore A hardness, and tear strength of the polyurethane material.

[0023] In the present invention, a water - borne fluorocarbon coating can be sprayed on the surface of the PU polyurethane runway material, and baked and thermally cured to obtain a PU - FC runway material, which can improve the wear resistance, waterproof performance, etc. of the runway material. Specific Embodiments

[0024] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is given in conjunction with the examples. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0025] The following polyether polyol model is HSH - 330N, purchased from Nantong Qinrui Yang Chemical Co., Ltd. The polyacrylonitrile fiber model is TC - PAN - 06, with a specification of 6 mm, purchased from Shandong Taicheng Fiber Co., Ltd. The FC water - borne fluorocarbon coating model is HF - 7211, purchased from Guangdong Hongfang Coating Co., Ltd.

[0026] Example 1:

[0027] (1) 50 g of polyacrylonitrile fiber was added to 2.5 L of an aqueous sodium hydroxide solution with a mass fraction of 7%, heated to 70 °C, reacted for 10 min, adjusted to pH 5 with hydrochloric acid, filtered, washed with water, and dried to obtain hydrolyzed polyacrylonitrile fiber.

[0028] (2) 40 mmol of N-Boc-serinol and 80 mmol of benzyl isocyanate were added to 100 mL of dichloromethane, reacted at 30 °C for 6 h, rotary evaporated, washed with petroleum ether. The intermediate was added to 120 mL of dichloromethane, 60 mL of trifluoroacetic acid was added dropwise, reacted at 20 °C for 8 h, an aqueous sodium bicarbonate solution was added, shaken and allowed to stand for liquid separation, the aqueous phase was removed, the dichloromethane extract was collected, rotary evaporated, and the product was recrystallized from ethanol to obtain 2-amino-1,3-bis(carbobenzoxyamide).

[0029] (3) 50 g of hydrolyzed polyacrylonitrile fiber, 3 g of 2-amino-1,3-bis(carbobenzoxyamide), 1.9 g of dicyclohexylcarbodiimide, and 0.2 g of 4-dimethylaminopyridine were added to 2 L of N,N-dimethylformamide, heated to 70 °C, stirred and reacted for 6 h, filtered, washed successively with ethanol and water, and dried to obtain modified polyacrylonitrile fiber.

[0030] (4) 1 kg of dry polyether polyol and 1.3 kg of diphenylmethane diisocyanate were reacted in a nitrogen atmosphere at 70 °C for 3 h, cooled and discharged to obtain a prepolymer component.

[0031] (5) 1.65 kg of polyether polyol, 92 g of chain extender 1,4-butanediol, 220 g of plasticizer bis(2-ethylhexyl) phthalate, 9 g of catalyst lead isooctanoate, 9 g of phenylmercuric acetate, 400 g of filler calcium carbonate, and 20 g of modified polyacrylonitrile fiber were stirred and mixed, ground evenly to obtain a curing agent component; then the curing agent component and the prepolymer component were stirred and mixed, quickly poured into a mold, and cured at 25 °C for 24 h to obtain a high mechanical strength PU polyurethane runway material.

[0032] Example 2:

[0033] (1) 50 g of polyacrylonitrile fiber was added to 2 L of an aqueous sodium hydroxide solution with a mass fraction of 12%, heated to 60 °C, reacted for 15 min, adjusted to pH 6 with hydrochloric acid, filtered, washed with water, and dried to obtain hydrolyzed polyacrylonitrile fiber.

[0034] (2) Add 40 mmol of N-Boc-serinol and 88 mmol of benzyl isocyanate to 120 mL of dichloromethane, react at 30 °C for 6 h, rotary evaporate, wash with petroleum ether. Add the intermediate to 120 mL of dichloromethane, dropwise add 80 mL of trifluoroacetic acid, react at 25 °C for 5 h, add an aqueous sodium bicarbonate solution, shake and then let it stand for liquid separation. Remove the aqueous phase, collect the dichloromethane extract, rotary evaporate, and recrystallize the product from ethanol to obtain 2-amino-1,3-propanediyl bis(benzylcarbamate).

[0035] (3) Add 50 g of hydrolyzed polyacrylonitrile fiber, 6.5 g of 2-amino-1,3-propanediyl bis(benzylcarbamate), 4 g of dicyclohexylcarbodiimide, and 0.3 g of 4-dimethylaminopyridine to 2.5 L of N,N-dimethylformamide, heat to 70 °C, stir and react for 8 h, filter, wash successively with ethanol and water, and dry to obtain the modified polyacrylonitrile fiber.

[0036] (4) React 1 kg of dry polyether polyol and 0.9 kg of toluene diisocyanate in a nitrogen atmosphere at 80 °C for 2 h, cool and discharge to obtain the prepolymer component.

[0037] (5) Stir and mix 1.4 kg of polyether polyol, 60 g of chain extender diethanolamine, 150 g of plasticizer dioctyl phthalate, 7 g of catalyst lead isooctanoate, 7 g of phenylmercuric acetate, 200 g of filler montmorillonite, and 50 g of modified polyacrylonitrile fiber, grind evenly to obtain the curing agent component; then stir and mix the curing agent component and the prepolymer component, quickly pour them into a mold, and cure at 35 °C for 18 h to obtain the high mechanical strength PU polyurethane runway material.

[0038] Example 3:

[0039] (1) Add 50 g of polyacrylonitrile fiber to 2.5 L of 10% sodium hydroxide aqueous solution, heat to 80 °C, react for 10 min, adjust the pH to 6 with hydrochloric acid, filter, wash with water, and dry to obtain the hydrolyzed polyacrylonitrile fiber.

[0040] (2) Add 40 mmol of N-Boc-serinol and 88 mmol of benzyl isocyanate to 100 mL of dichloromethane, carry out reflux condensation reaction at 40 °C for 4 h, rotary evaporate, wash with petroleum ether. Add the intermediate to 150 mL of dichloromethane, dropwise add 80 mL of trifluoroacetic acid, react at 20 °C for 6 h, add an aqueous sodium bicarbonate solution, shake and then let it stand for liquid separation. Remove the aqueous phase, collect the dichloromethane extract, rotary evaporate, and recrystallize the product from ethanol to obtain 2-amino-1,3-propanediyl bis(benzylcarbamate).

[0041] (3) Add 50 g of hydrolyzed polyacrylonitrile fiber, 10 g of 2-amino-1,3-propanediol dicarbamate, 6.3 g of dicyclohexylcarbodiimide, and 0.6 g of 4-dimethylaminopyridine to 3 L of N,N-dimethylformamide. Heat to 85 °C and stir for 3 h. Filter, wash successively with ethanol and water, and dry to obtain modified polyacrylonitrile fiber.

[0042] (4) React 1 kg of dry polyether polyol and 1.2 kg of diphenylmethane diisocyanate in a nitrogen atmosphere at 75 °C for 3 h. Cool and discharge to obtain the prepolymer component.

[0043] (5) Stir and mix 1.6 kg of polyether polyol, 120 g of chain extender 1,6-hexanediol, 300 g of plasticizer dibutyl phthalate, 8.4 g of catalyst lead isooctanoate, 8.4 g of phenylmercury acetate, 280 g of filler talc powder, and 80 g of modified polyacrylonitrile fiber, and grind evenly to obtain the curing agent component; then stir and mix the curing agent component and the prepolymer component, quickly pour into a mold, and cure at 20 °C for 24 h to obtain a high mechanical strength PU polyurethane runway material.

[0044] Comparative Example 1:

[0045] (1) React 1 kg of dry polyether polyol and 1.3 kg of diphenylmethane diisocyanate in a nitrogen atmosphere at 70 °C for 3 h. Cool and discharge to obtain the prepolymer component.

[0046] (2) Stir and mix 1.65 kg of polyether polyol, 92 g of chain extender 1,4-butanediol, 220 g of plasticizer phthalic acid (2-ethyl ester), 9 g of catalyst lead isooctanoate, 9 g of phenylmercury acetate, and 400 g of filler calcium carbonate, and grind evenly to obtain the curing agent component; then stir and mix the curing agent component and the prepolymer component, quickly pour into a mold, and cure at 25 °C for 24 h to obtain a PU polyurethane runway material.

[0047] Comparative Example 2:

[0048] (1) React 1 kg of dry polyether polyol and 1.3 kg of diphenylmethane diisocyanate in a nitrogen atmosphere at 70 °C for 3 h. Cool and discharge to obtain the prepolymer component.

[0049] (2) Stir and mix 1.65 kg of polyether polyol, 92 g of chain extender 1,4-butanediol, 220 g of plasticizer phthalic acid (2-ethyl ester), 9 g of catalyst lead isooctanoate, 9 g of phenylmercury acetate, 400 g of filler calcium carbonate, and 20 g of polyacrylonitrile fiber, and grind evenly to obtain the curing agent component; then stir and mix the curing agent component and the prepolymer component, quickly pour into a mold, and cure at 25 °C for 24 h to obtain a PU polyurethane runway material.

[0050] Comparative Example 3:

[0051] (1) 1 kg of dry polyether polyol and 1.3 kg of diphenylmethane diisocyanate were reacted in a nitrogen atmosphere at 70 °C for 3 h, cooled and discharged to obtain a prepolymer component.

[0052] (2) 1.65 kg of polyether polyol, 92 g of chain extender 1,4-butanediol, 220 g of plasticizer phthalic acid (2-ethyl ester), 9 g of catalyst lead isooctanoate, 9 g of phenylmercury acetate, 400 g of filler calcium carbonate, and 20 g of hydrolyzed polyacrylonitrile fiber (prepared in Example 1) were stirred and mixed, ground evenly to obtain a curing agent component; then the curing agent component and the prepolymer component were stirred and mixed, quickly poured into a mold, and cured at 25 °C for 24 h to obtain a PU polyurethane runway material.

[0053] Comparative Example 4

[0054] (1) 50 g of hydrolyzed polyacrylonitrile fiber (prepared in Example 1), 3 g of benzylamine, 1.9 g of dicyclohexylcarbodiimide, and 0.2 g of 4-dimethylaminopyridine were added to 2 L of N,N-dimethylformamide, heated to 70 °C, stirred and reacted for 6 h, filtered, washed successively with ethanol and water, and dried to obtain modified polyacrylonitrile fiber.

[0055] (2) 1 kg of dry polyether polyol and 1.3 kg of diphenylmethane diisocyanate were reacted in a nitrogen atmosphere at 70 °C for 3 h, cooled and discharged to obtain a prepolymer component.

[0056] (3) 1.65 kg of polyether polyol, 92 g of chain extender 1,4-butanediol, 220 g of plasticizer phthalic acid (2-ethyl ester), 9 g of catalyst lead isooctanoate, 9 g of phenylmercury acetate, 400 g of filler calcium carbonate, and 20 g of modified polyacrylonitrile fiber were stirred and mixed, ground evenly to obtain a curing agent component; then the curing agent component and the prepolymer component were stirred and mixed, quickly poured into a mold, and cured at 25 °C for 24 h to obtain a PU polyurethane runway material.

[0057] The tensile properties of the polyurethane runway material were tested according to the GB / T 528-2009 standard. The hardness was tested according to the GB / T 531.1-2008 standard. The tear strength was tested according to the GB / T 529-2008 standard.

[0058] Table 1 Performance Test of Polyurethane Runway Material

[0059]

[0060] After testing, compared with Comparative Example 1, modified polyacrylonitrile fibers were added to the polyurethane runway materials of Examples 1-4. The surface of the modified polyacrylonitrile fibers contains a large number of urethane groups, which are the same as the urethane groups of polyurethane, resulting in good compatibility between the polyacrylonitrile fibers and polyurethane. The polyacrylonitrile fibers are evenly dispersed in the polyurethane material. At the same time, there are strong hydrogen bond interactions between the urethane groups, carboxyl groups, amide bonds, etc. on the surface of the polyacrylonitrile fibers and polyurethane, improving the interfacial bonding force between the two, enabling the polyacrylonitrile fibers to play a better reinforcing role, and significantly improving the tensile properties, Shore A hardness and tear strength of the polyurethane material.

[0061] In Comparative Example 2, ordinary polyacrylonitrile fibers were added. Their compatibility with the polyurethane material is very poor, the interfacial force between the two is low, the reinforcing effect of the polyacrylonitrile fibers on polyurethane is not good, and the mechanical properties of the material are low. In Comparative Example 3, hydrolyzed polyacrylonitrile fibers were added. They do not contain urethane groups, have poor compatibility with polyurethane, have a poor reinforcing effect on polyurethane, and the mechanical properties of the material are low. In Comparative Example 4, benzylamine was used to react with hydrolyzed polyacrylonitrile fibers. The obtained modified polyacrylonitrile fibers do not contain urethane groups, have poor compatibility with polyurethane, have a poor reinforcing effect on polyurethane, and the mechanical properties of the material are low.

[0062] The present invention also provides the following examples:

[0063] Example 4:

[0064] FC waterborne fluorocarbon coating was sprayed on the surface of high-mechanical-strength PU polyurethane runway material (prepared by Example 1), baked and cured at 80 °C for 2 h first, and then baked and cured at 125 °C for 3 h to obtain a high-mechanical-strength PU-FC runway material.

[0065] Example 5:

[0066] FC waterborne fluorocarbon coating was sprayed on the surface of high-mechanical-strength PU polyurethane runway material (prepared by Example 2), baked and cured at 80 °C for 2 h first, and then baked and cured at 130 °C for 2 h to obtain a high-mechanical-strength PU-FC runway material.

[0067] Example 6:

[0068] FC waterborne fluorocarbon coating was sprayed on the surface of high-mechanical-strength PU polyurethane runway material (prepared by Example 2), baked and cured at 90 °C for 1 h first, and then baked and cured at 120 °C for 3 h to obtain a high-mechanical-strength PU-FC runway material.

[0069] By spraying waterborne fluorocarbon coating on the surface of the PU polyurethane runway material, the wear resistance, waterproofness and other properties of the PU polyurethane material can be improved.

[0070] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A PU-FC runway material with high mechanical strength, characterized in that, The described PU-FC runway material includes a high-mechanical-strength PU polyurethane runway material and an FC waterborne fluorocarbon coating; The high-mechanical-strength PU polyurethane runway material includes a prepolymer component and a curing agent component; The prepolymer component includes 100 parts by weight of polyether polyol and 90 - 130 parts by weight of isocyanate compound; The curing agent component includes 140 - 165 parts by weight of polyether polyol, 6 - 12 parts by weight of chain extender, 15 - 30 parts by weight of plasticizer, 1.4 - 1.8 parts by weight of catalyst, 20 - 40 parts by weight of filler, and 2 - 8 parts by weight of modified polyacrylonitrile fiber; The preparation method of the modified polyacrylonitrile fiber is as follows: Add hydrolyzed polyacrylonitrile fiber, 2-amino-1,3-propylene bis(carbamic acid benzyl ester), dicyclohexylcarbodiimide, and 4-dimethylaminopyridine to N,N-dimethylformamide, stir and react, filter, wash, and dry to obtain the modified polyacrylonitrile fiber.

2. The high-mechanical-strength PU-FC runway material according to claim 1, characterized in that, The isocyanate compound is toluene diisocyanate or diphenylmethane diisocyanate.

3. The high-mechanical-strength PU-FC runway material according to claim 1, wherein The chain extender is 1,4-butanediol, 1,6-hexanediol, or diethanolamine; the catalyst is any one or a combination of lead isooctanoate or phenylmercury acetate.

4. The high mechanical strength PU-FC runway material according to claim 1, characterized in that, The plasticizer is bis(2-ethylhexyl) phthalate, dioctyl phthalate, or dibutyl phthalate.

5. The PU-FC runway material with high mechanical strength according to claim 1, characterized in that, The filler is calcium carbonate, talcum powder, or montmorillonite.

6. The high-mechanical-strength PU-FC runway material according to claim 1, characterized in that, The dosage of the hydrolyzed polyacrylonitrile fiber is 100 parts by weight, the dosage of 2-amino-1,3-propylene bis(carbamic acid benzyl ester) is 6 - 20 parts by weight, the dosage of dicyclohexylcarbodiimide is 3.8 - 12.6 parts by weight, and the dosage of 4-dimethylaminopyridine is 0.4 - 1.2 parts by weight.

7. The high-mechanical-strength PU-FC runway material according to claim 1, characterized in that, In the preparation method of the modified polyacrylonitrile fiber, the reaction temperature is 70 - 85 °C and the reaction time is 3 - 8 h.

8. The high-mechanical-strength PU-FC runway material according to claim 1, wherein The preparation method of the hydrolyzed polyacrylonitrile fiber is as follows: Add polyacrylonitrile fiber to an aqueous sodium hydroxide solution with a mass fraction of 7 - 12%, heat to 60 - 80 °C, react for 10 - 15 min, add hydrochloric acid to adjust the pH to 5 - 6, filter and wash with water, and dry to obtain the hydrolyzed polyacrylonitrile fiber.

9. The high mechanical strength PU-FC runway material according to claim 6, characterized in that, The preparation method of 2-amino-1,3-propylene bis(carbamic acid benzyl ester) is as follows: Add N-Boc-serinol and benzyl isocyanate with a molar ratio of 1:(2 - 2.2) to dichloromethane, react at 30 - 40 °C for 4 - 6 h, rotary evaporate, wash, add the intermediate to dichloromethane, dropwise add trifluoroacetic acid, react at 20 - 25 °C for 5 - 8 h, add an aqueous sodium bicarbonate solution, extract, and recrystallize the product in ethanol to obtain 2-amino-1,3-propylene bis(carbamic acid benzyl ester).

10. A preparation method of a PU-FC runway material with high mechanical strength according to any one of claims 1-8, characterized in that, The preparation method is as follows: (1) React dry polyether polyol and isocyanate compound in a nitrogen atmosphere at 70 - 80 °C for 2 - 3 h, cool and discharge to obtain the prepolymer component; (2) Stir and mix polyether polyol, chain extender, plasticizer, catalyst, filler, and modified polyacrylonitrile fiber, grind evenly to obtain the curing agent component; then stir and mix the curing agent component and the prepolymer component, quickly pour into a mold, and cure at 20 - 35 °C for 18 - 24 h to obtain the high-mechanical-strength PU polyurethane runway material. (3) Spray the FC waterborne fluorocarbon coating on the surface of the high mechanical strength PU polyurethane runway material, and thermally cure it to obtain a high mechanical strength PU-FC runway material.

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