Polyurea material, preparation method thereof and application of polyurea material in sports field

Abstract

The invention discloses a polyurea material, a preparation method thereof and application of the polyurea material in a sports field. The polyurea material comprises a component A and a component B, the component A comprises the following components in parts by weight: 35-65 parts of polyaspartic ester resin and 4-12 parts of reaction type silicon-containing polyaspartic resin, the reaction type silicon-containing polyaspartic resin has an aspartic ester type secondary amine active hydrogen structure, and at least one hydrolyzable alkoxy silane group is introduced into the molecular structure of the reaction type silicon-containing polyaspartic resin; and the component B comprises polyisocyanate. The reactive silicon-containing polyaspartic resin is introduced into a polyaspartic acid ester system, so that a silicon-containing structure participates in construction of a polyurea network in a reaction mode, and the interface bonding stability and service performance consistency of the material under the conditions of damp heat, water vapor, ultraviolet and abrasion coupling are improved on the premise that the curing speed and the elastic property are not affected.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a polyurea material, its preparation method, and its application in sports venues. Background Technology

[0002] Sports fields typically refer to functional paved areas used for running, ball game training, and competitive matches. Their structure generally includes a base layer such as cement concrete or asphalt, an elastic layer providing cushioning and rebound, and a surface functional layer providing wear resistance, slip resistance, and aesthetic appeal. During use, sports fields need to withstand repeated foot impacts, rolling and sliding friction, and changes in personnel load over long periods. They are also frequently exposed to rain, moisture, ultraviolet radiation, and temperature cycling. Therefore, comprehensive requirements are placed on the surface layer material. It must not only possess good elastic recovery, wear resistance, and mechanical stability, but also maintain consistency in slip resistance, durability, and user comfort under long-term environmental coupling, and form a reliable bond with the base layer to prevent blistering, cracking, or localized failure.

[0003] Currently, polyurea materials are used as protective layers, elastic layers, or functional surface layers in sports fields due to their rapid curing, dense film formation, and good wear and weather resistance. The common method is spraying or troweling them onto the surface of a cement concrete substrate to form a continuous elastic coating. At the same time, engineering practices in sports fields place greater emphasis on materials that not only meet initial performance standards but also maintain stable film formation under large-area construction conditions and retain performance during long-term use. For example, under humid and hot environments, residual moisture in the substrate after rain, and extreme temperature variations caused by sunlight, the material must maintain high interfacial bonding reliability and surface functional stability.

[0004] However, in practical engineering, polyurea systems for sports fields may still suffer from insufficient long-term service consistency. This manifests as difficulty in consistently controlling the interfacial bonding quality due to fluctuations in the construction environment and substrate condition. Furthermore, the surface layer experiences reduced elasticity and resilience, drift in wear resistance and anti-slip properties, and localized powdering or texture instability under the combined effects of humidity, heat, UV radiation, and abrasion. These issues lead to decreased comfort and safety, and increased maintenance costs. These problems, to some extent, restrict the further promotion and high-quality application of polyurea materials in the sports field. Therefore, there is a need to provide a polyurea material more suitable for the working conditions of sports fields to improve the overall stability and long-term consistency during construction and service. Summary of the Invention

[0005] This application provides a polyurea material to address the technical problems of existing polyurea materials used in sports fields, such as difficulty in controlling the interfacial bonding quality under humid and hot environments, residual moisture in the base layer, and the coupling effect of ultraviolet radiation and abrasion, as well as the lack of long-term consistency in elastic rebound and wear resistance and anti-slip performance during service.

[0006] To achieve the above objectives, embodiments of this application provide a polyurea material, comprising component A and component B; By weight, component A comprises 35-65 parts of polyaspartic acid ester resin and 4-12 parts of reactive silicon-containing polyaspartic acid resin, wherein the reactive silicon-containing polyaspartic acid resin has an active hydrogen structure of aspartic acid ester type secondary amine and at least one hydrolyzable alkoxysilyl group is introduced into its molecular structure. Component B includes polyisocyanates.

[0007] Optionally, the reactive silicon-containing polyaspartic resin is an aspartic acid ester type secondary amine resin prepared by Michael addition reaction of an amine compound containing a hydrolyzable alkoxysilane group with maleic acid diester or fumarate diester.

[0008] Optionally, the hydrolyzable alkoxysilane group in the reactive silicon-containing polyaspartic resin is a monohydrolyzable silane group or a dihydrolyzable silane group.

[0009] Optionally, based on the total active hydrogen equivalent of component A, the amount of hydrolyzable alkoxysilane groups introduced by the reactive silicon-containing polyaspartic resin accounts for 0.2% to 3.0% of the total active hydrogen equivalent of component A.

[0010] Optionally, component B includes aliphatic polyisocyanates and / or alicyclic polyisocyanates.

[0011] Optionally, the ratio of component A to component B is such that the NCO index is 0.98 to 1.08.

[0012] To achieve the above objectives, this application also proposes a method for preparing a polyurea material, comprising the following steps: Component A was prepared by mixing polyaspartic acid ester resin with reactive silicon-containing polyaspartic resin. Component B, containing polyisocyanates, is provided; The components A and B are metered and mixed, stirred evenly, and then cured and molded.

[0013] Optionally, the reactive silicon-containing polyaspartic resin is prepared by the following steps: under controlled conditions of moisture content in the reaction system, an amine compound containing a hydrolyzable alkoxysilane group is subjected to a Michael addition reaction with maleic acid diester or fumarate diester to obtain a reactive silicon-containing polyaspartic resin with an aspartic acid ester type secondary amine active hydrogen structure.

[0014] Optionally, the moisture content of component A is determined by Karl Fischer method to be no more than 0.10 wt%.

[0015] To achieve the above objectives, this application also proposes the application of polyurea material in sports fields, wherein the elastic layer and / or surface functional layer of the sports field adopts the polyurea material described in the above embodiments.

[0016] The polyurea material in this embodiment employs a two-component system. During use, component A and component B are metered and mixed, then coated onto a substrate or substructure, and cured into a film within a short time. Component A uses polyaspartic ester resin as the main reactive resin, and incorporates a certain proportion of reactive silicone-containing polyaspartic resin. Component B provides polyisocyanate as the curing component. After mixing, the active hydrogen of the aspartic ester-type secondary amine in component A undergoes an addition reaction with the isocyanate groups in component B, rapidly forming a cross-linked network dominated by urea bonds. This allows the coating to form a stable film and a continuous structure under large-area application conditions. Since the reactive silicone-containing polyaspartic resin also possesses active hydrogen of the aspartic ester-type secondary amine, it does not exist as a free additive during curing but participates in network formation together with the main resin. This avoids fluctuations in the interface and surface state caused by migration, exudation, or phase separation of the silicone component before and after curing, allowing the coating to achieve a more consistent network structure and interface morphology during the formation stage, laying the foundation for long-term service stability.

[0017] The cured network contains hydrolyzable alkoxysilane groups introduced by reactive silica-containing polyaspartic resin. This structure is more likely to hydrolyze with environmental moisture in the contact area between the coating and the mineral substrate, generating silanol groups. The surface of the mineral substrate commonly contains hydroxyl and silicate-related active sites, and the silanol groups can condense with these sites to form siloxane bonds. Since this process occurs after the coating has formed a film, the chemical bonding at the interface, combined with the existing mechanical interlocking, makes the interface more stable in bearing shear and peel stress under humid heat, moisture fluctuations, and temperature cycling. It is less prone to significant fluctuations in bonding quality due to changes in the substrate condition, thus reducing the probability of blistering, cracking, and localized failure. Simultaneously, the coating body, with its urea-linked cross-linked network as a framework, possesses good elastic recovery and wear resistance. Under the combined effects of UV radiation, humid heat, and abrasion, the improved interface stability helps inhibit the propagation of interfacial micro-damage to the surface, reducing stress concentration and surface micro-crack accumulation caused by localized debonding. This minimizes the drift of resilience and surface function over time, thus better meeting the long-term consistency requirements of sports venues for comfort and safety. Detailed Implementation

[0018] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0019] Example 1 Component A was prepared by weight, comprising 55 parts polyaspartic ester resin and 7 parts reactive silicone-containing polyaspartic resin. The reactive silicone-containing polyaspartic resin has an active hydrogen structure of aspartic ester-type secondary amine, and at least one hydrolyzable alkoxysilyl group is introduced into its molecular structure. The two resins were added to a dry, clean mixing container and mechanically stirred at 20–30 degrees Celsius until the system was homogeneous, thus obtaining component A.

[0020] Component B, an aliphatic polyisocyanate curing component, was prepared. The mass ratio of components A to B was determined based on the equivalent active hydrogen of all aspartic ester-type secondary amines in component A and the equivalent isocyanate groups in component B, resulting in an NCO index of 1.03 for the mixture. Components A and B were metered and added to a mixing cup according to the mass ratio, stirred thoroughly, and immediately poured into a standard flat mold with a thickness of 2 mm. The mixture was then allowed to cure at 23±2 degrees Celsius until surface dry, and then allowed to cure further to obtain polyurea sheet samples for testing.

[0021] Example 2 Component A was prepared by weight, comprising 60 parts of polyaspartic acid ester resin and 5 parts of reactive silicone-containing polyaspartic resin, wherein the reactive silicone-containing polyaspartic resin satisfies the structural characteristics described in Example 1. The two resins were stirred and mixed at 20–30 degrees Celsius until the system was homogeneous to obtain component A.

[0022] Component B, an alicyclic polyisocyanate curing component, was prepared. Based on the equivalent of the active hydrogen in the secondary amine of component A and the equivalent of the isocyanate groups in component B, the mass ratio of components A to B was determined to achieve an NCO index of 0.99 for the mixture. Components A and B were metered and mixed according to the mass ratio and stirred thoroughly. The mixture was poured into a standard flat mold with a thickness of 2 mm and cured at 23±2 degrees Celsius to obtain a polyurea sheet sample.

[0023] Example 3 Component A was prepared by weight, comprising 45 parts polyaspartic acid ester resin and 10 parts reactive silicone-containing polyaspartic acid resin, wherein the reactive silicone-containing polyaspartic acid resin satisfies the structural characteristics described in Example 1. The two resins were stirred and mixed at 20–30 degrees Celsius until the system was homogeneous to obtain component A.

[0024] Component B was prepared, which is a compound curing component consisting of aliphatic and alicyclic polyisocyanates. Based on the equivalent of the active hydrogen in the secondary amine of component A and the equivalent of the isocyanate groups in component B, the mass ratio of components A and B was determined to achieve an NCO index of 1.06 for the mixture. Components A and B were metered and mixed according to the mass ratio and stirred thoroughly. The mixture was poured into a standard flat mold with a thickness of 2 mm and cured at 23±2 degrees Celsius to obtain a polyurea material sheet sample.

[0025] Example 4 An amine compound containing a monohydrolyzable alkoxysilane group was added to a dry, sealed reaction vessel, and the moisture content of the system was controlled to be no more than 0.10 wt% under nitrogen protection. Maleate diester was then added, and a Michael addition reaction was carried out at 20–40°C. During the reaction, the feed ratio and reaction time were controlled to gradually transform the system into a clear and homogeneous liquid product. After the reaction, a reactive silicon-containing polyaspartic resin with an active hydrogen structure of aspartic ester-type secondary amine and a monohydrolyzable alkoxysilane group introduced into the molecular structure was obtained.

[0026] The reactive silicone-containing polyaspartic resin prepared above was used as part of component A and mixed with polyaspartic ester resin in the proportions described in Example 1 to prepare component A; component B, containing aliphatic polyisocyanate, was also provided separately. The mass ratio was calculated based on the total active hydrogen equivalent of component A and the isocyanate equivalent of component B, so that the NCO index of the mixed system was 1.03. After the components A and B were metered and mixed according to the mass ratio and stirred evenly, the mixture was poured into a standard flat mold with a thickness of 2 mm and cured at 23±2 degrees Celsius to obtain polyurea material sheet samples for performance testing.

[0027] Example 5 An amine compound containing a dihydrolyzable alkoxysilyl group was added to a dry, sealed reaction vessel. Fumarate diester was then added to the system, and a Michael addition reaction was carried out at 20–40°C. The system remained homogeneous and transparent during the reaction. Upon completion, a reactive silica-containing polyaspartic resin with an active hydrogen structure of an aspartic ester-type secondary amine and a dihydrolyzable alkoxysilyl group was obtained.

[0028] The above-mentioned reactive silicone-containing polyaspartic resin was used as part of component A, and mixed with polyaspartic ester resin in the proportions described in Example 3 to prepare component A; a compound component B containing aliphatic polyisocyanate and alicyclic polyisocyanate was also provided. The mass ratio of component A to component B was determined according to the equivalence relationship between components A and B, so that the NCO index of the mixed system was 1.06. Component A and component B were mixed and stirred evenly according to the mass ratio, poured into a standard flat mold with a thickness of 2 mm, and cured at 23±2 degrees Celsius to obtain polyurea material sheet samples for performance testing.

[0029] Comparative Example 1 Component A was prepared by weight, comprising only 62 parts of polyaspartic ester resin, without any reactive silicone-containing polyaspartic resin or other silicone-containing components. The polyaspartic ester resin was added to a dry and clean mixing container and mechanically stirred at 20–30 degrees Celsius until the system was homogeneous, thus obtaining Component A of Comparative Example 1.

[0030] Component B was prepared. Component B is an aliphatic polyisocyanate curing component, and the same aliphatic polyisocyanate as in Example 1 was selected. Based on the equivalent active hydrogen of the aspartic ester-type secondary amine in Component A of Comparative Example 1 and the equivalent isocyanate groups in Component B, the mass ratio of Component A to Component B was determined to achieve an NCO index of 1.03 for the mixed system. Components A and B were metered and added to a mixing cup according to the mass ratio, stirred thoroughly, and immediately poured into a standard flat mold with a thickness of 2 mm. The mixture was then cured at 23 ± 2 degrees Celsius to obtain a polyurea material sheet sample for testing.

[0031] Comparative Example 2 Component A was prepared by weight, comprising 55 parts polyaspartic ester resin and 7 parts silicon-containing additive. The silicon-containing additive is a silane compound containing a hydrolyzable alkoxysilane group in its molecular structure. This silicon-containing additive does not possess the active hydrogen structure of an aspartic ester-type secondary amine and cannot undergo an addition reaction with the isocyanate group in component B; it exists only in the system as a physical blend. The polyaspartic ester resin and the silicon-containing additive were added to a dry, clean mixing container and mechanically stirred at 20–30 degrees Celsius until the system was homogeneous, yielding component A of Comparative Example 2.

[0032] Component B was prepared. Component B is an aliphatic polyisocyanate curing component, and the same aliphatic polyisocyanate as in Example 1 was selected. Based on the equivalent active hydrogen of the aspartic ester-type secondary amine in Component A of Comparative Example 2 and the equivalent isocyanate groups in Component B, the mass ratio of Component A to Component B was determined to achieve an NCO index of 1.03 for the mixed system. Components A and B were metered and mixed according to the mass ratio and stirred evenly. The mixture was poured into a standard flat mold with a thickness of 2 mm and cured at 23 ± 2 degrees Celsius to obtain a polyurea material sheet sample for testing.

[0033] Comparative Example 3 An amine compound containing a hydrolyzable alkoxysilane group was added to a reaction vessel, and maleic acid diester was directly added to initiate a Michael addition reaction without controlling the moisture content of the reaction system. During the reaction, the system gradually became turbid, the viscosity increased significantly, and local gelation occurred in the later stage of the reaction. The resulting product had poor uniformity, making it difficult to obtain a stable reactive silica-containing polyaspartic resin.

[0034] The product obtained above was used as part of component A and mixed with polyaspartic ester resin in the same proportion as in Example 1 to prepare component A; component B, containing aliphatic polyisocyanate, was also provided separately. The mass ratio of component A to component B was determined based on the equivalence relationship, so that the NCO index of the mixture was 1.03. After mixing and stirring component A and component B evenly, the mixture was poured into a standard flat mold with a thickness of 2 mm and cured at 23±2 degrees Celsius to obtain polyurea material sheet samples for performance testing.

[0035] Performance testing The interfacial bonding performance was tested using the pull-out method. A cement substrate was used as the base material, and the substrate was prepared by grinding and dust removal. Components A and B from the examples or comparative examples were mixed and stirred evenly according to the corresponding NCO index ratio, and then uniformly coated onto the surface of the cement substrate to form a coating film. The dry film thickness was controlled at 2 mm, and the film was cured at 23±2 degrees Celsius. After curing, a standard pull-out steel block was bonded to the coating surface using structural adhesive. After the structural adhesive cured, a pull-out adhesion tester was used to apply a vertical tensile force to the steel block until failure. The maximum pull-out force was recorded and converted into the pull-out strength; the failure morphology was also recorded, distinguishing between interfacial failure, coating cohesive failure, or substrate failure. At least 5 parallel points were tested for each group of samples, and the average value was taken as the interfacial pull-out strength of that group.

[0036] The interfacial retention test after humid heat aging was conducted in a humid heat constant temperature and humidity chamber. The cured coated substrate was placed in a humid heat environment for aging, with aging conditions set at 60 degrees Celsius and 95% relative humidity for 7 days. After aging, the samples were allowed to recover at 23±2 degrees Celsius for 24 hours, and then the pull-out strength was tested using the pull-out method described above. The ratio of the pull-out strength after aging to the pull-out strength before aging was calculated as the interfacial bonding retention rate, and the changes in the failure morphology were recorded.

[0037] The abrasion resistance test was conducted using the rotary abrasion method. Using 2 mm thick sheets obtained in the examples and comparative examples as samples, test pieces of specified dimensions were cut and conditioned for 24 hours at 23±2 degrees Celsius and 50±5% relative humidity before testing. The test pieces were mounted on a rotary abrasion testing machine, a standard grinding wheel was selected, and a specified load was applied. The abrasion speed was set to 1000 revolutions. The mass of the sample was weighed before and after the test, and the mass loss was calculated or converted into volumetric abrasion. The mass measurement was performed using an electronic balance with an accuracy of 0.1 mg.

[0038] The anti-slip performance was tested using the pendulum friction coefficient method. The materials from the examples and comparative examples were coated onto a flat substrate and cured into a film to form a smooth test surface. After conditioning the samples at 23±2 degrees Celsius, the pendulum value was measured using a pendulum friction coefficient tester under dry conditions. Each group of samples was tested at least five times, and the average value was taken as the anti-slip index. To evaluate the anti-slip retention after the coupling of damp heat and wear, the pendulum value of similar samples could be retested after damp heat aging or wear testing, and the ratio of the retested value to the initial value was calculated as the anti-slip retention rate.

[0039] The elastic rebound performance test was conducted using the ball rebound method. Using the sheet samples obtained in the examples and comparative examples as test objects, the samples were placed on a horizontal rigid base, and a standard steel ball was released at a specified height. The rebound height of the steel ball was measured, and the rebound rate was calculated. Each group of samples was tested at least five times, and the average value was taken as the rebound index. To evaluate the rebound retention under environmental conditions, the samples could be retested under the same conditions after damp heat aging, and the retention rate calculated.

[0040] In the above tests, the sample preparation thickness, curing conditions, humidity conditioning conditions, and number of tests were kept consistent for each embodiment and comparative sample; the retention rate was expressed as the ratio of the measured value after aging or treatment to the initial measured value for the corresponding item.

[0041] Test results and data Table 1. Tensile strength of each sample interface and its retention after damp heat aging As shown in Table 1, Examples 1-5 all exhibited high and similar interfacial pull-out strengths in the initial state, and maintained a strength retention rate of over 90% after hygrothermal aging. Furthermore, the failure morphology was mainly cohesive failure within the coating film, indicating that the interfacial bonding remained stable under high temperature and humidity conditions. Examples 4 and 5 did not show a decrease in interfacial retention rate compared to Examples 1-3, indicating that the reactive silica-containing polyaspartic resins prepared in Examples 4 and 5 can also stably participate in the construction of the polyurea network and maintain the interfacial bonding state.

[0042] In Comparative Example 1, without the introduction of reactive silicon-containing polyaspartic resin, the pull-out strength decreased significantly after hygrothermal aging, mainly due to interfacial damage. In Comparative Example 2, although a silicon-containing component was introduced, it did not enter the polyurea network in a reactive structure, resulting in insufficient interfacial retention after hygrothermal aging. In Comparative Example 3, the moisture conditions were not controlled during the preparation of the reactive silicon-containing polyaspartic resin, leading to unstable resin structure and dispersion. The interfacial retention rate of its polyurea material after hygrothermal aging was also significantly lower than that of the Example Group.

[0043] Table 2. Changes in wear resistance and anti-slip index after wear for each sample As shown in Table 2, the wear amounts of Examples 1-5 were all at low levels, the decrease in anti-slip index after wear was small, and the anti-slip retention rate was stable. Examples 4 and 5 maintained the same wear resistance and anti-slip retention as Examples 1-3, indicating that the reactive silicon-containing polyaspartic resins obtained through different methods did not weaken the surface functional stability of the material under wear.

[0044] Comparative Example 1 showed a significantly higher wear amount under abrasion conditions, and the anti-slip index decreased significantly. Although Comparative Examples 2 and 3 were similar to the Example Group in terms of initial anti-slip index, their anti-slip retention rate after abrasion was still significantly lower than that of the Example Group, indicating that their surface structure was more prone to deterioration under friction.

[0045] Table 3. Elastic resilience and retention after damp heat aging for each sample As shown in Table 3, Examples 1-5 maintained a high resilience rate after humid heat aging, and the resilience retention rate was stable, indicating that the elastic structure of the material decreased little under high temperature and high humidity conditions. The resilience performance of Examples 4 and 5 was basically the same as that of Examples 1-3, indicating that the reactive silicon-containing polyaspartic resin prepared under controlled water conditions would not have an adverse effect on the elastic resilience of the polyurea material.

[0046] Comparative Examples 1, 2, and 3 showed a significant decrease in resilience after humid heat aging, and their resilience retention rate was significantly lower than that of the Example Group, reflecting the insufficient stability of their elastic structure under environmental conditions.

[0047] The test results summarized in Tables 1-3 show that, under the same sample preparation and testing conditions, Examples 1-5 exhibited high levels of retention in interfacial bonding performance, surface anti-slip performance, and elastic resilience after exposure to humid heat and abrasion, with minimal performance changes, demonstrating good service consistency. The polyurea materials corresponding to Examples 4 and 5 maintained consistent performance indicators with those of Examples 1-3, indicating that the reactive silica-containing polyaspartic resin prepared under controlled water conditions, regardless of the introduced hydrolyzable alkoxysilane group structure, can stably participate in the construction of the polyurea system and maintain the overall material performance.

[0048] In contrast, the comparative samples showed more significant performance degradation under humid heat aging and abrasion conditions. Among them, Comparative Example 3 did not control the moisture conditions during the preparation of the reactive silicon-containing polyaspartic resin, resulting in its polyurea material failing to reach the level of the example group in terms of interfacial bonding retention, wear resistance and anti-slip retention, and elastic rebound retention. This further illustrates that water control conditions and reactive introduction methods are of practical significance for obtaining stable service performance.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the present invention's specification under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A polyurea material, characterized in that, Includes component A and component B; By weight, component A comprises 35-65 parts of polyaspartic acid ester resin and 4-12 parts of reactive silicon-containing polyaspartic acid resin, wherein the reactive silicon-containing polyaspartic acid resin has an active hydrogen structure of aspartic acid ester type secondary amine and at least one hydrolyzable alkoxysilyl group is introduced into its molecular structure. Component B includes polyisocyanates.

2. The polyurea material according to claim 1, characterized in that, The reactive silicon-containing polyaspartic resin is an aspartic acid ester type secondary amine resin prepared by Michael addition reaction of an amine compound containing a hydrolyzable alkoxysilane group with maleic acid diester or fumarate diester.

3. The polyurea material according to claim 1, characterized in that, The hydrolyzable alkoxysilane group in the reactive silicon-containing polyaspartic resin is either a monohydrolyzable silane group or a dihydrolyzable silane group.

4. The polyurea material according to claim 1, characterized in that, Based on the total active hydrogen equivalent of component A, the amount of hydrolyzable alkoxysilane groups introduced by the reactive silicon-containing polyaspartic resin accounts for 0.2% to 3.0% of the total active hydrogen equivalent of component A.

5. The polyurea material according to claim 1, characterized in that, Component B includes aliphatic polyisocyanates and / or alicyclic polyisocyanates.

6. The polyurea material according to claim 1, characterized in that, The ratio of component A to component B results in an NCO index of 0.98 to 1.

08.

7. A method for preparing a polyurea material according to any one of claims 1 to 6, characterized in that, Includes the following steps: Component A was prepared by mixing polyaspartic acid ester resin with reactive silicon-containing polyaspartic resin. Component B, containing polyisocyanates, is provided; The components A and B are metered and mixed, stirred evenly, and then cured and molded.

8. The method for preparing polyurea material according to claim 7, characterized in that, The reactive silicon-containing polyaspartic resin is prepared by the following steps: under controlled conditions of moisture content in the reaction system, an amine compound containing a hydrolyzable alkoxysilane group is subjected to a Michael addition reaction with maleic acid diester or fumarate diester to obtain a reactive silicon-containing polyaspartic resin with an aspartic acid ester type secondary amine active hydrogen structure.

9. The method for preparing polyurea material according to claim 7, characterized in that, The moisture content of component A, as determined by the Karl Fischer method, is no more than 0.10 wt%.

10. The application of a polyurea material in sports fields, characterized in that, The elastic layer and / or surface functional layer of the sports field are made of polyurea material as described in any one of claims 1 to 6.

Images