A yellowing-resistant aspartame polyurea plastic track surface material and a preparation method thereof

Abstract

The application relates to the technical field of runway surface layer materials, and discloses a yellowing-resistant aspartame polyurea plastic runway surface layer material and a preparation method thereof. The yellowing-resistant aspartame polyurea plastic runway surface layer material is prepared by mixing A component, an adhesive and a ternary ethylene-propylene rubber; the raw materials of the A component include polyaspartic acid ester resin, polyether polyol, plasticizer, filler, pigment, dispersant, defoaming agent, antioxidant, ultraviolet absorber and curing agent; the polyaspartic acid ester resin comprises polyaspartic acid ester resin I and polyaspartic acid ester resin II with a weight ratio of 1-9:1, the NH equivalent of the polyaspartic acid ester resin I is 230-255 g / mol, and the NH equivalent of the polyaspartic acid ester resin II is 304-316 g / mol. Through the technical scheme, the problem of low mechanical property of the runway surface layer material in the related art is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of runway surface materials, in particular to a yellowing-resistant aspartame polyurea plastic runway surface material and a preparation method thereof. BACKGROUND

[0002] As a kind of sports ground material widely used in schools, stadiums and other places, the performance of plastic runway is directly related to the safety and performance of athletes. Traditional plastic runway surface is mostly made of polyurethane (PU) or ethylene-propylene-diene rubber (EPDM) and other materials. However, these materials generally have the problems of insufficient weather resistance and easy mechanical property decline during long-term outdoor use. Especially in harsh environments such as ultraviolet radiation and alternating heat and humidity, the molecular chain of traditional runway surface material is prone to breakage or crosslinking density reduction, resulting in gradual loss of tensile strength of the material, affecting the service life and safety. In addition to the functional requirements of plastic runway, people also have new requirements for color, from red to blue runway, and even colorful rainbow runway. Currently, the plastic runway surface material is mostly polyurethane spraying material of methylene diphenyl diisocyanate (MDI) type, which contains aromatic polyurethane adhesive with poor weather resistance and is prone to yellowing. The yellowing of polyurethane spraying material is not obvious in visual, but for organic pigments such as phthalocyanine green and phthalocyanine blue, the weather resistance is poor, and the ordinary methylene diphenyl diisocyanate (MDI) type polyurethane spraying material quickly changes color.

[0003] Therefore, it is of great significance to develop a plastic runway surface material with good mechanical properties and yellowing resistance to meet the long-term durability requirements of modern sports facilities. SUMMARY

[0004] The application provides a yellowing-resistant aspartame polyurea plastic runway surface material and a preparation method thereof, which solves the problem of low mechanical property of runway surface material in the prior art.

[0005] The technical scheme of the application is as follows:

[0006] The application provides a yellowing-resistant aspartame polyurea plastic runway surface material, which is mixed by A component, adhesive and ethylene-propylene-diene rubber.

[0007] The raw materials of the A component include the following components in parts by weight:

[0008] Polyaspartic ester resin 10~50 parts, polyether polyol 10~20 parts, plasticizer 5~20 parts, filler 20~40 parts, pigment 3~6 parts, dispersant 0.2~1 parts, antifoaming agent 0.2~1 parts, antioxidant 0.5~2 parts, ultraviolet light absorber 0.5~2 parts, curing agent 0.5~2 parts;

[0009] The polyaspartic ester resin comprises polyaspartic ester resin I and polyaspartic ester resin II in a weight ratio of 1~9:1;

[0010] The NH equivalent of the polyaspartic ester resin I is 230~255g / mol, and the NH equivalent of the polyaspartic ester resin II is 304~316g / mol.

[0011] As a further technical solution, the weight ratio of the polyaspartic ester resin I and the polyaspartic ester resin II is 1.5~4:1.

[0012] In the present application, when the weight ratio of the polyaspartic ester resin I and the polyaspartic ester resin II is 1.5~4:1, the mechanical properties of the aspartame polyurea plastic track surface layer material can be further improved.

[0013] As a further technical solution, the filler comprises one or more of calcium carbonate, talc powder, and barium sulfate.

[0014] As a further technical solution, when the filler is talc powder, the talc powder is modified talc powder.

[0015] The raw material of the modified talc powder comprises talc powder and a hydroxyl-containing acrylamide compound in a weight ratio of 30:2~7.

[0016] As a further technical solution, the hydroxyl-containing acrylamide compound comprises one or both of N-(2-hydroxypropyl) methacrylamide and N-(hydroxymethyl) acrylamide, and is preferably N-(2-hydroxypropyl) methacrylamide.

[0017] In the present application, the hydroxyl-containing acrylamide compound is used to modify the talc powder, improving the dispersibility of the talc powder in the organic matrix components such as polyaspartic ester resin and polyether polyol, and to some extent, improving the interfacial bonding of the talc powder with the organic matrix in the A component, such as polyaspartic ester resin and polyether polyol. The uniformly dispersed talc powder particles can form a more stable physical shielding structure inside the material, reducing the damage of ultraviolet light to the aspartame polyurea plastic track surface layer material and improving its ultraviolet aging resistance.

[0018] In the present application, the weight ratio of talc and hydroxyl-containing acrylamide compound is 30:2~7, for example, it can be 30:2, 30:3, 30:4, 30:5, 30:6, 30:7, preferably 30:3~5, when the weight ratio of talc and hydroxyl-containing acrylamide compound is 30:3~5, the ultraviolet aging resistance of the asparagus amine polyurea plastic track surface layer material can be further improved.

[0019] As a further technical solution, the preparation method of the modified talc powder comprises the following steps:

[0020] The hydroxyl-containing acrylamide compound is dispersed in ethanol, the talc powder is added, mixed uniformly, concentrated, dried, and the modified talc powder is obtained.

[0021] As a further technical solution, the plasticizer comprises one or more of chlorinated paraffin, tributyl citrate, chlorinated palm oil methyl ester, alkyl sulfonate phenyl ester, preferably tributyl citrate;

[0022] The pigment comprises one of phthalocyanine blue, phthalocyanine green, sunfast red, sunfast yellow;

[0023] The dispersant comprises one or both of TEGO-650 dispersant and TEGO-652 dispersant, preferably TEGO-650 dispersant;

[0024] The defoaming agent comprises one or more of TEGO-825 defoaming agent, TEGO-990 defoaming agent, and TEGO-902W defoaming agent;

[0025] The antioxidant comprises one or more of antioxidant 1010, antioxidant 245, and antioxidant 1098;

[0026] The ultraviolet absorber comprises one or more of UV-531, UV-329, and UV-320, preferably UV-531;

[0027] The curing agent comprises hexamethylene diisocyanate trimer.

[0028] The present application provides a preparation method of a yellowing-resistant asparagus amine polyurea plastic track surface layer material, which is used for preparing the yellowing-resistant asparagus amine polyurea plastic track surface layer material and comprises the following steps:

[0029] S1, the polyether polyol, pigment and dispersant are mixed uniformly, ground, and the color paste is obtained;

[0030] S2, after the first mixing of the polyaspartic acid ester resin, color paste, plasticizer and filler, adding defoaming agent, ultraviolet absorber, antioxidant, after the second mixing, adding curing agent, third mixing, to get A component;

[0031] S3, the A component, adhesive and ethylene propylene diene rubber are mixed uniformly to obtain the anti-yellowing aspartame polyurea plastic track surface layer material.

[0032] As a further technical solution, the weight ratio of the A component, adhesive and ethylene propylene diene rubber is 1:1:1.

[0033] As a further technical solution, the particle size of the color paste is <30 μm.

[0034] As a further technical solution, in step S2, the stirring speed is 450-550 r / min and the stirring time is 30-35 min in the first mixing; the stirring speed is 1000-1100 r / min and the stirring time is 100 min in the second mixing; the stirring speed is 1000-1100 r / min and the stirring time is 30 min in the third mixing.

[0035] As a further technical solution, the raw materials of the adhesive include the following components by weight:

[0036] Cycloaliphatic diisocyanate 20-40 parts, trimethylolpropane 5-10 parts, chain extender 5-10 parts, polyether polyol 30-60 parts, stabilizer 1-2 parts, catalyst 1-3 parts, silane coupling agent 1-5 parts.

[0037] As a further technical solution, the raw materials of the adhesive include the following components by weight:

[0038] Cycloaliphatic diisocyanate 30 parts, trimethylolpropane 6 parts, chain extender 6 parts, polyether polyol 50 parts, stabilizer 2 parts, catalyst 3 parts, silane coupling agent 2 parts.

[0039] As a further technical solution, the cycloaliphatic diisocyanate includes isophorone diisocyanate and hydrogenated 4,4'-dicyclohexyl methane diisocyanate in a weight ratio of 1:1.

[0040] As a further technical solution, the stabilizer is phosphoric acid, and the mass fraction of the phosphoric acid is 85%.

[0041] As a further technical solution, the chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, diethylene glycol, and neopentyl glycol, preferably 1,4-butanediol.

[0042] As a further technical solution, the catalyst is a metal coordination catalyst, such as dibutyltin dilaurate or zinc isooctanoate, preferably dibutyltin dilaurate.

[0043] As a further technical solution, the silane coupling agent includes one or two of γ-aminopropyltriethoxysilane and γ-mercaptopropyltrimethoxysilane, preferably γ-aminopropyltriethoxysilane.

[0044] As a further technical solution, the method for preparing the adhesive includes the following steps:

[0045] A1. Mix the chain extender with 50% by weight of polyether polyol, add the trimethylolpropane, and mix evenly to obtain mixture A;

[0046] A2. Mix the alicyclic diisocyanate and stabilizer, add the remaining parts by weight of polyether polyol and silane coupling agent, mix evenly to obtain mixture B;

[0047] A3. Mix 50% by weight of mixture A and mixture B, then add the remaining parts by weight of mixture A, mix evenly, add 50% by weight of catalyst, carry out the first reaction, add the remaining parts by weight of catalyst, carry out the second reaction, and obtain the adhesive.

[0048] As a further technical solution, in step A1, the temperature is 65°C and the time is 1 hour when the mixture is homogeneous.

[0049] As a further technical solution, in step A2, when the mixture is homogeneous, the temperature is 60~70℃ and the time is 30min.

[0050] As a further technical solution, in step A3, the mixing temperature is 60~70℃ and the time is 20min; the mixing time is 80~85℃ and the time is 2h.

[0051] During the first reaction, the temperature was maintained at 80-85℃ for 10-12 hours, and then the temperature was lowered to 65℃.

[0052] The second reaction was carried out at 65°C for 30 minutes.

[0053] As a further technical solution, in both component A and the adhesive, the polyether polyol is independently a trifunctional polyether.

[0054] In this invention, the polyether polyol is a trifunctional polyether with a number average molecular weight of 300-5000, such as polyether polyol N303, polyether polyol N305, polyether polyol N307, polyether polyol N310, polyether polyol N4030, and polyether polyol N5030.

[0055] The working principle and beneficial effects of this invention are as follows:

[0056] This invention relates to an aspartic polyurea plastic running track surface material, which uses polyaspartic ester resin and polyether polyol as the main materials, combined with fillers, pigments, dispersants, and other additives to form component A. This is then combined with adhesives and EPDM rubber, and through a specific formulation, sprayed and cured to form the surface layer of the plastic running track. This solves the problem of easy fading of blue running track surfaces and exhibits good resistance to yellowing. Simultaneously, the prepared aspartic polyurea plastic running track surface material possesses excellent mechanical properties. Component A includes two types of polyaspartic ester resin with NH equivalents of 230-255 g / mol and 304-316 g / mol. The combined use of these two polyaspartic ester resins effectively improves the mechanical properties of the plastic running track surface material. Polyaspartic acid ester resins with an NH equivalent of 230~255 g / mol have relatively short molecular weights and relatively high activity, enabling them to quickly form high-density cross-linked networks. Polyaspartic acid ester resins with an NH equivalent of 304~316 g / mol have relatively long molecular chains, relatively low cross-linking density, and higher molecular activity. By using two polyaspartic acid ester resins with different NH equivalents together, a structure with moderate density can be formed, and the material can be given ductility. Stress can be evenly transmitted under load, further improving the overall tensile strength of the plastic running track surface material. Detailed Implementation

[0057] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0058] In the following examples and comparative examples, the polyaspartic acid ester resin with an NH equivalent of 230 g / mol was model 6620; the polyaspartic acid ester resin with an NH equivalent of 304 g / mol was model 7423; the polyaspartic acid ester resin with an NH equivalent of 255 g / mol was model JH-8122; the polyaspartic acid ester resin with an NH equivalent of 316 g / mol was model 7474; the polyaspartic acid ester resin with an NH equivalent of 291 g / mol was model LB-852A; the polyaspartic acid ester resin with an NH equivalent of 334 g / mol was model 6671; the polyether polyol was polyether polyol N310, with a functionality of 3 and a number average molecular weight of 1000, purchased from Guangzhou Yinghong Chemical Co., Ltd.; and the EPDM rubber was model EPDM-3640.

[0059] The preparation method of the adhesive includes the following steps:

[0060] A1. Add 6 parts of 1,4-butanediol and 25 parts of polyether polyol to a reaction vessel and stir to mix. Add 6 parts of trimethylolpropane and stir to mix at 65°C for 1 hour to obtain mixture A.

[0061] A2. Add 15 parts of isophorone diisocyanate, 15 parts of hydrogenated 4,4′-dicyclohexylmethane diisocyanate and 2 parts of phosphoric acid to a reaction vessel and stir to mix. Add 25 parts of polyether polyol and 2 parts of γ-aminopropyltriethoxysilane and stir to mix at 65°C for 30 min to obtain mixture B.

[0062] A3. Add 50% by weight of mixture A and mixture B to the reactor. Stir and mix at 65°C for 20 minutes. Add the remaining mixture A. Heat to 80°C and stir for 2 hours. Add 1.5 parts of dibutyltin dilaurate. Keep the temperature at 80°C for 10 hours. Cool to 65°C. Add 1.5 parts of catalyst. Stir and react at 65°C for 30 minutes to obtain the adhesive.

[0063] Example 1

[0064] A method for preparing a yellowing-resistant aspartic acid polyurea plastic running track surface material includes the following steps:

[0065] S1. Mix 10 parts of polyether polyol, 3 parts of phthalocyanine blue and 0.2 parts of TEGO-650 dispersant evenly, grind to obtain a color paste with a particle size of 25μm;

[0066] S2. Mix 5 parts of polyaspartic acid ester resin (NH equivalent 230 g / mol), 5 parts of polyaspartic acid ester resin (NH equivalent 304 g / mol), color paste, 5 parts of tributyl citrate and 20 parts of talc powder at 500 r / min for 30 min. Add 0.2 parts of TEGO-990 defoamer, 0.5 parts of UV absorber UV-531 and 0.5 parts of antioxidant 245 and stir at 1000 r / min for 100 min. Add 0.5 parts of hexamethylene diisocyanate trimer and continue stirring at 1000 r / min for 30 min to obtain component A.

[0067] S3. Mix component A, adhesive and EPDM rubber (weight ratio 1:1:1) evenly to obtain yellowing resistant aspartic acid polyurea plastic running track surface material.

[0068] Example 2

[0069] A method for preparing a yellowing-resistant aspartic acid polyurea plastic running track surface material includes the following steps:

[0070] S1. Mix 16 parts of polyether polyol, 4 parts of phthalocyanine blue and 0.7 parts of TEGO-650 dispersant evenly, grind to obtain a color paste with a particle size of 25μm;

[0071] S2. Mix 18 parts of polyaspartic acid ester resin (NH equivalent 230 g / mol), 18 parts of polyaspartic acid ester resin (NH equivalent 304 g / mol), color paste, 10 parts of tributyl citrate and 30 parts of talc powder at 500 r / min for 30 min. Add 0.3 parts of TEGO-990 defoamer, 1 part of UV absorber UV-531 and 1 part of antioxidant 245 and stir at 1000 r / min for 100 min. Add 1 part of hexamethylene diisocyanate trimer and continue stirring at 1000 r / min for 30 min to obtain component A.

[0072] S3. Mix component A, adhesive and EPDM rubber (weight ratio 1:1:1) evenly to obtain yellowing resistant aspartic acid polyurea plastic running track surface material.

[0073] Example 3

[0074] A method for preparing a yellowing-resistant aspartic acid polyurea plastic running track surface material includes the following steps:

[0075] S1. Mix 20 parts of polyether polyol, 6 parts of phthalocyanine blue and 1 part of TEGO-650 dispersant evenly, grind and obtain a color paste with a particle size of 25μm.

[0076] S2. 25 parts of polyaspartic acid ester resin (NH equivalent of 255 g / mol), 25 parts of polyaspartic acid ester resin (NH equivalent of 316 g / mol), color paste, 20 parts of tributyl citrate and 40 parts of talc are stirred at 500 r / min for 30 min. 1 part of TEGO-990 defoamer, 2 parts of UV absorber UV-531 and 2 parts of antioxidant 245 are added and stirred at 1000 r / min for 100 min. 2 parts of hexamethylene diisocyanate trimer are added and stirred at 1000 r / min for another 30 min to obtain component A.

[0077] S3. Mix component A, adhesive and EPDM rubber (weight ratio 1:1:1) evenly to obtain yellowing resistant aspartic acid polyurea plastic running track surface material.

[0078] Example 4

[0079] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the amount of polyaspartic acid ester resin (NH equivalent of 230 g / mol) added is 32.4 parts, and the amount of polyaspartic acid ester resin (NH equivalent of 304 g / mol) added is 3.6 parts.

[0080] Example 5

[0081] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the amount of polyaspartic acid ester resin (NH equivalent of 230 g / mol) added is 21.6 parts, and the amount of polyaspartic acid ester resin (NH equivalent of 304 g / mol) added is 14.4 parts.

[0082] Example 6

[0083] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the amount of polyaspartic acid ester resin (NH equivalent of 230 g / mol) added is 28.8 parts, and the amount of polyaspartic acid ester resin (NH equivalent of 304 g / mol) added is 7.2 parts.

[0084] Example 7

[0085] The only difference between this embodiment and Example 6 is that in this embodiment, the talc powder is modified talc powder. The preparation method of modified talc powder includes the following steps: dispersing 2 parts of N-(2-hydroxypropyl)methacrylamide in 50 parts of ethanol, adding 30 parts of talc powder, mixing evenly, concentrating, and drying to obtain modified talc powder.

[0086] Example 8

[0087] The only difference between this embodiment and Example 7 is that in the preparation method of modified talc powder in this embodiment, the amount of N-(2-hydroxypropyl)methacrylamide added is 3 parts.

[0088] Example 9

[0089] The only difference between this embodiment and Example 7 is that in the preparation method of modified talc powder in this embodiment, 5 parts of N-(2-hydroxypropyl)methacrylamide are added.

[0090] Example 10

[0091] The only difference between this embodiment and Example 7 is that in the preparation method of modified talc powder in this embodiment, the amount of N-(2-hydroxypropyl)methacrylamide added is 7 parts.

[0092] Comparative Example 1

[0093] The only difference between this comparative example and Example 2 is that in this comparative example, the polyaspartic acid ester resin (NH equivalent of 230 g / mol) is replaced with an equal amount of polyaspartic acid ester resin (NH equivalent of 304 g / mol).

[0094] Comparative Example 2

[0095] The only difference between this comparative example and Example 2 is that in this comparative example, the polyaspartic acid ester resin (NH equivalent of 304 g / mol) is replaced with an equal amount of polyaspartic acid ester resin (NH equivalent of 230 g / mol).

[0096] Comparative Example 3

[0097] The only difference between this comparative example and Example 2 is that in this comparative example, the polyaspartic ester resin (NH equivalent of 230 g / mol) is replaced with an equal amount of polyaspartic ester resin (NH equivalent of 291 g / mol), and the polyaspartic ester resin (NH equivalent of 304 g / mol) is replaced with an equal amount of polyaspartic ester resin (NH equivalent of 334 g / mol).

[0098] Experimental Example 1

[0099] The plastic running track surface materials prepared in Examples 1-10 and Comparative Examples 1-3 were sprayed onto the PU running track base plate. After curing for 7 days, a sample module with a thickness of 13 mm was obtained. The tensile strength of the sample module was tested according to the test method in GB 36246-2018 "Synthetic Material Surface Sports Fields for Primary and Secondary Schools". The test results are shown in Table 1.

[0100] Table 1 Performance test results of Examples 1-10 and Comparative Examples 1-3

[0101]

[0102] Compared with Comparative Examples 1-3, the tensile strength of the plastic running track surface materials prepared in Examples 1-10 was improved, indicating that when two polyaspartic acid ester resins with NH equivalents of 230-255 g / mol and 304-316 g / mol were added to component A of the plastic running track surface material, the mechanical properties of the plastic running track surface material can be effectively improved by using two polyaspartic acid ester resins with different NH equivalents in combination.

[0103] Experiment Example 2

[0104] The plastic running track surface material prepared in Examples 6-10 was sprayed onto the PU running track base plate. After curing for 7 days, a sample module with a thickness of 13 mm was obtained. Xenon lamp irradiation test was carried out according to the test method in GB 36246-2018 "Synthetic Material Surface Sports Fields for Primary and Secondary Schools". The test time was 500 hours. After the test, the ultraviolet aging tensile strength test was carried out according to the above tensile strength test method. The test results are shown in Table 2.

[0105] Table 2 Performance test results of Examples 6-10

[0106]

[0107] The tensile strength change rate after 500h UV aging test was calculated as (tensile strength before 500h UV aging test - tensile strength after 500h UV aging test) / tensile strength before 500h UV aging test × 100%. Compared with Example 6, the tensile strength change rate of the plastic running track surface material prepared in Examples 7-10 was smaller after 500h UV aging test. This indicates that modifying the talc filler in component A of the plastic running track surface material with hydroxyl-containing acrylamide compounds can effectively improve the UV aging resistance of the plastic running track surface material.

[0108] Experimental Example 3

[0109] The plastic running track surface materials prepared in Examples 1-3 were sprayed onto the PU running track base plate. After curing for 7 days, a sample module with a thickness of 13 mm was obtained, and the following performance tests were conducted:

[0110] (1) Surface drying time and actual drying time test: The plastic running track surface material prepared in Examples 1 to 3 was sprayed onto the PU running track base plate. Before curing, the surface drying time and actual drying time were tested according to the method in GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film".

[0111] (2) Yellowing resistance test: The yellowing resistance test of the sample modules of Examples 1 to 3 was carried out according to the method in GB / T 1766-2008 "Rating method for aging of paint and varnish coatings". The change of the plastic track surface material on the sample module was observed under xenon lamp for 3500h.

[0112] The test results are shown in Table 3:

[0113] Table 3 Performance test results of Examples 1-3

[0114]

[0115] As can be seen from Table 3, the plastic track surface material samples of Examples 1-3, after being exposed to the sun outdoors for 10 days and 60 days, showed no change in color compared to the samples placed indoors. Furthermore, after 3500 hours under a xenon lamp, the plastic track surface material showed no abnormalities. This indicates that the aspartic acid polyurea plastic track surface material prepared by this invention has good resistance to yellowing, good weather resistance, and is not easy to fade, which can meet the requirements for long-term use of the track.

[0116] The above are merely 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A yellowing-resistant aspartic acid polyurea plastic running track surface material, characterized in that, It is composed of component A, adhesive and EPDM rubber; The raw materials for component A include the following components in parts by weight: The composition includes 10-50 parts of polyaspartic acid ester resin, 10-20 parts of polyether polyol, 5-20 parts of plasticizer, 20-40 parts of filler, 3-6 parts of pigment, 0.2-1 part of dispersant, 0.2-1 part of defoamer, 0.5-2 parts of antioxidant, 0.5-2 parts of ultraviolet absorber, and 0.5-2 parts of curing agent. The polyaspartic acid ester resin includes polyaspartic acid ester resin I and polyaspartic acid ester resin II in a weight ratio of 1 to 9:

1. The NH equivalent of polyaspartic acid ester resin I is 230~255 g / mol, and the NH equivalent of polyaspartic acid ester resin II is 304~316 g / mol. The adhesive raw materials comprise the following components in parts by weight: 30 parts alicyclic diisocyanate, 6 parts trimethylolpropane, 6 parts chain extender, 50 parts polyether polyol, 2 parts stabilizer, 3 parts catalyst, and 2 parts silane coupling agent.

2. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 1, characterized in that, The weight ratio of polyaspartic acid ester resin I to polyaspartic acid ester resin II is 1.5~4:

1.

3. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 1, characterized in that, The filler includes one or more of calcium carbonate, talc, and barium sulfate.

4. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 3, characterized in that, When the filler is talc, the talc is modified talc; The raw materials for the modified talc powder include talc powder and hydroxyl-containing acrylamide compounds in a weight ratio of 30:2~7.

5. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 4, characterized in that, The hydroxyl-containing acrylamide compounds include one or both of N-(2-hydroxypropyl)methacrylamide and N-(hydroxymethyl)acrylamide.

6. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 4, characterized in that, The preparation method of the modified talc powder includes the following steps: The hydroxyl-containing acrylamide compound is dispersed in ethanol, the talc powder is added, mixed evenly, concentrated, and dried to obtain the modified talc powder.

7. The aspartic acid polyurea plastic running track surface material resistant to yellowing according to claim 1, characterized in that, The plasticizer includes one or more of chlorinated paraffin, tributyl citrate, methyl palmitate, and alkyl sulfonate; The pigments include one of phthalocyanine blue, phthalocyanine green, fast red, and fast yellow. The dispersant includes one or both of TEGO-650 dispersant and TEGO-652 dispersant; The defoamer includes one or more of TEGO-825 defoamer, TEGO-990 defoamer, and TEGO-902W defoamer; The antioxidant includes one or more of antioxidant 1010, antioxidant 245, and antioxidant 1098; The ultraviolet absorber includes one or more of UV-531, UV-329, and UV-320; The curing agent includes hexamethylene diisocyanate trimer.

8. A method for preparing a yellowing-resistant aspartic polyurea plastic running track surface material, used to prepare the yellowing-resistant aspartic polyurea plastic running track surface material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix the polyether polyol, pigment and dispersant evenly, and grind to obtain a color paste; S2. After the polyaspartic acid ester resin, color paste, plasticizer and filler are mixed for the first time, defoamer, ultraviolet absorber and antioxidant are added, and after the second mixing, curing agent is added, and after the third mixing, component A is obtained. S3. Mix the A component, adhesive and EPDM rubber evenly to obtain the yellowing-resistant aspartic acid polyurea plastic running track surface material.

9. The method for preparing a yellowing-resistant aspartic acid polyurea plastic running track surface material according to claim 8, characterized in that, The weight ratio of component A, adhesive, and EPDM rubber is 1:1:

1.

10. The method for preparing a yellowing-resistant aspartic acid polyurea plastic running track surface material according to claim 8, characterized in that, The particle size of the pigment is <30μm.

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