Radix asparagi polyurea millstone floor composition

Abstract

The invention provides a radix asparagi polyurea millstone terrace composition, and relates to the technical field of terrace materials. The radix asparagi polyurea millstone floor composition is characterized by comprising a component A, a component B and a component C, the component A comprises asparaginic acid ester resin, wherein the molar ratio of C4-C8 alkyl groups in alkyl groups on ester groups is not less than 40%; the component B is an isocyanate curing agent, the isocyanate curing agent contains an HDI (hexamethylene diisocyanate) tripolymer, and preferably, the isocyanate curing agent also contains an HDI prepolymer obtained by reaction of HDI and polymer polyol; the component C is aggregate; the ratio of the weight sum of the component A and the component B to the weight of the component C is 1: (7-10). The radix asparagi polyurea millstone floor composition disclosed by the invention has good impact resistance after being cured.

Description

Technical Field

[0001] The invention belongs to the technical field of floor materials and relates to an asparagus polyurea grindstone floor composition. Background Art

[0002] Terrazzo floor is a new type of floor that imitates the construction of terrazzo floor. Currently, epoxy terrazzo floor is the main type on the market, but epoxy terrazzo floor has the problem of insufficient impact strength. When something hard hits the epoxy terrazzo floor, the epoxy terrazzo floor is prone to cracking. Impact strength is a very important evaluation index of terrazzo floor. Aspartame polyurea has better impact resistance than epoxy resin. The prior art reports aspartame polyurea terrazzo floor prepared by aspartic acid ester resins such as F420 resin and F520 resin, but there is no record of better impact resistance.

[0003] Therefore, how to improve the impact strength of asparagus polyurea terrazzo flooring is a technical problem that the industry urgently needs to solve, especially while maintaining the other properties of the terrazzo flooring basically unchanged. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an asparagus polyurea terrazzo floor composition.

[0005] The technical solution of the present invention is as follows:

[0006] An asparagus polyurea terrazzo floor composition, comprising component A, component B and component C;

[0007] The A component comprises an aspartic acid ester resin as shown in the following formula (1):

[0008]

[0009] wherein X is selected from a polyvalent organic structure having a number average molecular weight of 50-5000 which is chemically inert to isocyanate groups at 100°C and which is left after the amino groups of the polyvalent amino compound are removed; 1 and R 2 are respectively selected from C2-C8 alkyl, n=2-3;

[0010] The R 1 and the R 2 The molar proportion of C4-C8 alkyl groups is not less than 40% respectively;

[0011] The B component is an isocyanate curing agent, and the isocyanate curing agent contains HDI trimer;

[0012] The C component is aggregate;

[0013] The weight ratio of the component A and the component B to the component C is 1:7-10.

[0014] Preferably, the weight proportion of the aspartic acid ester resin in the component A is not less than 90%.

[0015] Preferably, the component A further comprises one or a combination of two or more of a dispersant, an adhesion promoter, a pigment, a wetting agent, a leveling agent and a defoaming agent.

[0016] Preferably, the C4-C8 alkyl group is a branched structure.

[0017] Preferably, the isocyanate curing agent further contains HDI prepolymer;

[0018] The HDI prepolymer is obtained by polymerizing HDI and polymer polyol;

[0019] The polymer polyol molecule contains no less than 3 hydroxyl groups on average.

[0020] More preferably, the content of NCO groups in the isocyanate curing agent is 17-22.5 wt %.

[0021] More preferably, the content of NCO groups in the HDI prepolymer is 7-11 wt %.

[0022] More preferably, the number average molecular weight of the polymer polyol is 400-1200.

[0023] Preferably, the molar ratio of the NH groups in the A component to the NCO groups in the B component is 1:1-1.2.

[0024] Preferably, the particle size of the aggregate is in the range of 0.05-10 mm.

[0025] The beneficial effects of the present invention are:

[0026] (1) The present invention adopts an aspartic acid ester resin with a longer carbon chain (C4-C8 alkyl) on the ester group as the main resin of the terrazzo floor. The longer carbon chain provides a stronger internal plasticization and solvation effect than the ethyl group in the F420 resin and the F520 resin, which can significantly improve the impact strength of the terrazzo floor.

[0027] (2) The present invention further adopts a curing agent composed of HDI prepolymer and HDI trimer, which further improves the impact strength of the terrazzo floor while maintaining the good bonding strength, tensile strength, hardness and other properties of the terrazzo floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the cracking condition of the asparagus polyurea floor of comparative example 2 under an impact energy of 30J, with small cracks present.

[0029] Figure 2 The cracking condition of the epoxy polyurea floor of comparative example 3 under an impact energy of 30J shows the presence of large cracks.

[0030] Figure 3 This is the cracking condition of the asparagus polyurea floor of Example 7 under an impact energy of 50J, with no cracking.

[0031] Figure 4 This is the cracking condition of the asparagus polyurea floor of Example 8 under an impact energy of 50J, with no cracking.

[0032] Figure 5 This is the cracking condition of the asparagus polyurea floor of comparative example 4 under an impact energy of 30J, with fine cracks present. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0034] In order to improve the impact resistance of asparagus polyurea terrazzo floor, the present invention provides an asparagus polyurea terrazzo floor composition, including component A, component B and component C;

[0035] Component A comprises an aspartic acid ester resin represented by the following formula (1):

[0036]

[0037] wherein X is selected from a polyvalent organic structure having a number average molecular weight of 50-5000 which is chemically inert to isocyanate groups at 100°C and which is left after the amino groups of the polyvalent amino compound are removed; 1 and R 2 are respectively selected from C2-C8 alkyl, n=2-3;

[0038] R 1 and R 2 The molar proportion of C4-C8 alkyl groups is not less than 40% respectively;

[0039] Component B is an isocyanate curing agent, which contains HDI trimer;

[0040] Component C is aggregate;

[0041] The weight ratio of component A to component B and component C is 1:7-10.

[0042] In the present invention, the alkyl group (R 1 and R 2) contains C4-C8 alkyl, which can provide stronger internal plasticization and solvation for terrazzo flooring due to its longer carbon chain than ethyl, thereby improving the impact resistance of terrazzo flooring. Moreover, the curing agent contains HDI trimer, which can provide high cross-linking density, so that the asparagus polyurea terrazzo flooring can maintain high bonding strength, tensile strength, scratch resistance, hardness and other properties, avoiding the degradation of these properties.

[0043] The above-mentioned polyamino compound may be 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, 4,4'-diaminodicyclohexylmethane, 4,4'-dimethyl-4,4'-diaminodicyclohexylmethane, isophoronediamine, 1,4-cyclohexanediamine, 1,3-cyclohexanediamine, 1,2-cyclohexanediamine, 2-methyl-1,4-cyclohexanediamine, etc., which are well known to those skilled in the art. However, from the perspective of improving the construction operability of the asparagus polyurea terrazzo floor, 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane is better.

[0044] For R 1 and R 2 The molar proportion of C4-C8 alkyl in the terrazzo floor is higher. The higher the molar proportion of C4-C8 alkyl, the better the impact resistance of the terrazzo floor is. However, it may cause the hardness of the terrazzo floor to become lower, and the scratch resistance and stain resistance to become worse. However, this situation can be adjusted by the curing agent. For example, R 1 and R 2 The molar proportion of C4-C8 alkyl in the formula (1) may be any value among 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., without any particular limitation. For example, the aspartic acid ester resin represented by the formula (1) may be R 1 and R 2 All of them are butyl or isobutyl aspartame resin (butyl aspartame resin), or a combination of butyl aspartame resin and F520 resin in a molar ratio of 1:1, 2:1, 3:1, 4:1, 5:1, 10:1, etc.

[0045] In the present invention, the aspartic acid ester resin shown in the above formula (1) can be obtained by Michael addition reaction of polyamino compounds and dialkyl maleate (such as diethyl maleate, dibutyl maleate, diisobutyl maleate, etc.), the reaction temperature can be 80-110°C, the reaction time can be 24-120h, or after the reaction is completed, it can be left at room temperature for 1 week to 3 months to promote the completion of the reaction. Alternatively, the aspartic acid ester resin shown in the above formula (1) can be obtained by Michael addition reaction of polyamino compounds and dibutyl maleate (or diisobutyl maleate, etc.) to obtain a secondary amine resin, and then mixed with F420 resin, F520 resin, etc. according to proportion.

[0046] The above HDI trimer curing agent can be purchased directly from the market, such as HT-100 from Wanhua Chemical, TPA-100 from Asahi Kasei, etc.

[0047] In a preferred embodiment of the present invention, the weight proportion of aspartic acid ester resin in component A is not less than 90%. Aspartic acid ester resin plays the role of a connecting material in terrazzo flooring. If the proportion of aspartic acid ester resin in component A is not high enough, it will affect the performance of terrazzo flooring, such as insufficient impact resistance and insufficient bonding strength. More preferably, the weight proportion of aspartic acid ester resin in component A is not higher than 98%. For example, the weight proportion can be any value of 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, etc., without special restrictions.

[0048] In a preferred embodiment of the present invention, component A may also include one or a combination of two or more of a dispersant, an adhesion promoter, a pigment, a wetting agent, a leveling agent and a defoaming agent. The dispersant helps the dispersion of the aggregate in the terrazzo floor composition, and the amount used may be 0-1wt% of the weight of component A, or further, the amount used may be 0.2-1wt% of the weight of component A; an adhesion promoter, such as a silane coupling agent, helps to improve the adhesion and bonding strength of the aspartame terrazzo floor to the substrate, and the amount used may be 0-5wt% of the weight of component A, or further, the amount used may be 0.5-5wt% of the weight of component A; the pigment may be an inorganic pigment or an organic pigment, which can give the terrazzo floor a more diverse range of colors and patterns, etc., and the amount used may be 0-5wt% of the weight of component A, or further, the amount used may be 0.1-5wt% of the weight of component A; a wetting agent, such as a polyether-modified silicone oil, can improve the adhesion and bonding strength of the aspartame terrazzo floor to the substrate. The wettability of the terrazzo floor to the substrate is more conducive to spreading and improving adhesion. The amount can be 0-1wt% of the weight of component A, or further, the amount can be 0.2-1wt% of the weight of component A; a leveling agent, such as a polyether modified silicone oil leveling agent, can improve the surface leveling of the asparagus polyurea terrazzo floor. The amount can be 0-1wt% of the weight of component A, or further, the amount can be 0.2-1wt% of the weight of component A; a defoaming agent, such as a dimethyl silicone oil defoaming agent, can reduce or eliminate the microbubbles generated during the preparation of the asparagus polyurea terrazzo floor composition or the microbubbles generated during the construction of the asparagus polyurea terrazzo floor composition. The amount can be 0-1wt% of the weight of component A, or further, the amount can be 0.2-1wt% of the weight of component A.

[0049] In the present invention, the preparation method of component A can be directly to mix, stir and disperse the raw material components uniformly. In order to prevent component A from absorbing moisture and affecting subsequent curing, the mixing, stirring and dispersing can be carried out in an airtight environment, such as under nitrogen protection.

[0050] In a preferred embodiment of the present invention, the C4-C8 alkyl group is a branched structure. The C4-C8 alkyl group with a branched structure can reduce the adverse effects on hardness, bonding strength, tensile strength, etc. while providing the asparagus polyurea terrazzo floor with better impact resistance. For example, the C4-C8 alkyl group with a branched structure can be isobutyl, tert-butyl, 2-methylpentyl, 2-methylbutyl, etc.

[0051] In a preferred embodiment of the present invention, the isocyanate curing agent further contains an HDI prepolymer;

[0052] HDI prepolymer is obtained by polymerizing HDI and polymer polyol;

[0053] The polymer polyol molecule contains an average of not less than 3 hydroxyl groups.

[0054] Isocyanate curing agent contains HDI prepolymer as described above, has higher functionality, can further improve the impact resistance of asparagus polyurea terrazzo flooring while providing higher crosslinking density. In the present invention, polymer polyol has no particular restrictions, can be polycarbonate polyol, polycaprolactone polyol, polyether polyol, conventional polyester polyol and the like. Conventional polyester polyol refers to a polymer polyol formed by polycondensation of aliphatic dicarboxylic acid and aliphatic diol. In the present invention, it is preferred that polyester polyol adopts polycarbonate polyol, because polycarbonate polyol can provide higher mechanical strength and hardness and other properties.

[0055] In a more preferred embodiment of the present invention, the content of NCO groups in the isocyanate curing agent is 17-22.5wt%. When the content of NCO groups in the isocyanate curing agent is within the above range, the curing performance of the asparagus polyurea terrazzo floor composition is better, and an asparagus polyurea terrazzo floor with better performance can be obtained. For example, the content of NCO groups in the isocyanate curing agent can be any value of 17wt%, 17.5wt%, 18wt%, 18.5wt%, 19wt%, 19.5wt%, 20wt%, 20.5wt%, 21wt%, 21.5wt%, 22wt%, 22.5wt%, etc., without special restrictions.

[0056] In a more preferred embodiment of the present invention, the content of NCO groups in the HDI prepolymer is 7-11wt%. The content of NCO groups in the HDI prepolymer is within the above range, which can control the crosslinking density of the asparagus polyurea terrazzo floor within a more suitable range and provide an asparagus polyurea terrazzo floor with better performance. Too low a content of NCO groups in the HDI prepolymer will result in insufficient crosslinking density of the terrazzo floor, and too high a content of NCO groups in the HDI prepolymer will result in too high a crosslinking density of the terrazzo floor. In the present invention, the HDI prepolymer can be directly obtained from the market, or directly obtained by reacting HDI and a polymer polyol. For example, the content of NCO groups in the HDI prepolymer can be any value of 7wt%, 7.5wt%, 8wt%, 8.5wt%, 9wt%, 9.5wt%, 10wt%, 10.5wt%, 11wt%, etc., without special restrictions. More preferably, the weight proportion of HDI prepolymer in component B is not less than 20%, for example, the weight proportion may be 20%, 25%, 30%, 35%, etc. If the weight proportion of HDI prepolymer in component B is not high enough, the effect is not prominent.

[0057] In a more preferred embodiment of the present invention, the number average molecular weight of the polymer polyol is 400-1200. If the number average molecular weight of the polymer polyol is too low, the effect of the polymer polyol is not obvious, and the crosslinking density of the asparagus polyurea terrazzo floor composition will be too high, resulting in a decrease in impact strength and the like; if the number average molecular weight of the polymer polyol is too high, the crosslinking density of the asparagus polyurea terrazzo floor composition will be too low, which will also result in a decrease in impact strength and the like. It is more appropriate that the number average molecular weight of the polymer polyol is 400-1200. For example, the number average molecular weight of the polymer polyol can be any value of 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, etc., without special restrictions.

[0058] In a preferred embodiment of the present invention, the molar ratio of the NH groups in component A to the NCO groups in component B is 1:1-1.2. For example, the molar ratio of the NH groups in component A to the NCO groups in component B can be any value of 1:1, 1:1.02, 1:1.05, 1:1.07, 1:1.08, 1:1.1, 1:1.12, 1:1.15, 1:1.18, 1:1.2, etc., without particular limitation. More preferably, the molar ratio is 1:1.02-1.1.

[0059] In a more preferred embodiment of the present invention, the aggregate has a particle size range of 0.05-10 mm. Specifically, the aggregate can be quartz sand, vitrified microspheres, crushed stone, aluminum hydroxide, colored glass, shells, and the like.

[0060] In the present invention, when preparing the asparagus polyurea terrazzo floor composition, component A, component B and component C are directly mixed evenly respectively under the condition of isolating from air or moisture, and are packaged separately. When using, they are mixed according to proportion and stirred evenly.

[0061] The technical solution of the present invention is further described and illustrated according to various embodiments below. Unless otherwise specified, the parts described in the following embodiments are parts by weight.

[0062] Example 1

[0063] Aspartic acid ester resin is composed of butyl aspartic acid resin (R in the above formula (1) 1 and R 2 All are butyl, X is a divalent organic structure remaining after removing two amino groups from 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, n=2) and F520 resin in a molar ratio of 2:3.

[0064] Component A is composed of aspartic acid ester resin, dispersant AEO-9 and KH-560 silane coupling agent in a weight ratio of 97:1:2.

[0065] Component B is HDI trimer HT-100.

[0066] Component C is quartz sand with an average particle size of 1 mm.

[0067] The ratio of the sum of the molar numbers of NH and OH groups in component A to the molar number of NCO groups in component B is 1:1.05.

[0068] The weight ratio of component A to component B and component C is 1:8.

[0069] In an airtight environment, component A, component B and component C are mixed and stirred evenly to obtain the asparagus polyurea terrazzo floor composition.

[0070] Example 2

[0071] The difference between this embodiment and embodiment 1 is that in embodiment 1, the molar ratio of butyl asparagine resin to F520 resin is adjusted from 2:3 to 3:1. The other steps remain unchanged.

[0072] Example 3

[0073] The difference between this embodiment and embodiment 1 is that in embodiment 1, F520 resin is replaced by butyl asparagine resin. The other steps remain unchanged.

[0074] Comparative Example 1

[0075] The difference between this comparative example and Example 1 is that in Example 1, the molar ratio of butyl asparagine resin to F520 resin is adjusted from 2:3 to 1:2. The other steps remain unchanged.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 1 is that in Example 1, butyl asparagine resin is replaced by F520 resin. The other steps remain unchanged.

[0078] Comparative Example 3

[0079] This comparative example is an epoxy terrazzo floor composition. Component A is composed of 128 epoxy resin, dispersant AEO-9 and KH-560 silane coupling agent in a weight ratio of 97:1:2, component B is a curing agent 4,4'-diaminodicyclohexylmethane, and component C is quartz sand with an average particle size of 1 mm.

[0080] The ratio of the molar number of epoxy groups in component A to the molar number of amino groups in component B is 1:1.08.

[0081] The weight ratio of component A to component B and component C is 1:7-10.

[0082] Performance Testing

[0083] The asparagus polyurea terrazzo floor compositions of Examples 1-3 and Comparative Examples 1-2 and the epoxy terrazzo floor composition of Comparative Example 3 were spread and compacted on the concrete surface to a thickness of 10 mm, and then cured and maintained.

[0084] Operable time: the time it takes for the viscosity to double under the conditions of 25°C and 55% humidity.

[0085] Shore D hardness: tested according to the method of GB / T22374-2018.6.3.6.

[0086] 28-day compressive strength: tested according to the method of GB / T22374-2018.6.3.8.

[0087] Tensile bond strength: tested according to the method of GB / T22374-2018.6.3.9.

[0088] Flexural strength: tested according to JC / T 1004.7.3.

[0089] Impact resistance (1Kg steel ball): Tested according to the method of GB / T22374-2018.6.3.10, the impact heights are 1m, 3m and 5m respectively, and the corresponding impact energies are 10J, 30J and 50J respectively. Observe whether there are cracks on the floor and the size of the cracks. Cracks are divided into fine cracks, small cracks and large cracks according to their size. Crack severity: fine cracks < small cracks < large cracks. The larger the cracks, the more severe the cracking, and the worse the impact resistance.

[0090] The results are shown in Table 1 below.

[0091] Table 1

[0092]

[0093] From the data in Table 1 above, it can be seen that the asparagine polyurea terrazzo floor of the present invention has significantly better impact resistance than the epoxy terrazzo floor, and other properties are similar. In addition, as the proportion of butyl groups on the ester group in the aspartic acid ester resin increases, the impact resistance of the asparagine polyurea terrazzo floor is enhanced.

[0094] Example 4

[0095] The aspartic acid ester resin consists of the butyl aspartic acid resin of Example 1.

[0096] Component A is composed of aspartic acid ester resin, dispersant AEO-9, polyether modified silicone oil wetting agent and KH-560 silane coupling agent in a weight ratio of 96.5:1:0.5:2.

[0097] Component B is HDI trimer HT-100.

[0098] Component C is quartz sand with an average particle size of 0.7 mm.

[0099] The ratio of the sum of the molar numbers of NH and OH groups in component A to the molar number of NCO groups in component B is 1:1.04.

[0100] The weight ratio of component A to component B and component C is 1:9.

[0101] In an airtight environment, component A, component B and component C are mixed and stirred evenly to obtain the asparagus polyurea terrazzo floor composition.

[0102] Example 5

[0103] The difference between this embodiment and embodiment 4 is that in embodiment 4, butyl asparagine resin is replaced by isobutyl asparagine resin. The other steps remain unchanged.

[0104] Isobutyl asparagine is R 1 and R 2 All are isobutyl groups, X is a divalent organic structure remaining after removing two amino groups from 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, and n=2.

[0105] Example 6

[0106] The difference between this example and Example 4 is that in Example 4, butyl asparagine resin is replaced by isopentyl asparagine resin. The other steps remain unchanged.

[0107] Isoamyl asparagine is R 1 and R2 All are isopentyl groups, X is a divalent organic structure remaining after removing two amino groups from 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, and n=2.

[0108] Example 7

[0109] The difference between this embodiment and embodiment 5 is that in embodiment 5, component B is composed of HDI prepolymer and HDI trimer component in a weight ratio of 1:4, the NCO group content of component B is 19.6wt%, the NCO group content of HDI prepolymer is 10.7wt%, and the HDI prepolymer is prepared from HDI and polycarbonate triol with a number average molecular weight of 500. The other steps remain unchanged.

[0110] Example 8

[0111] The difference between this embodiment and embodiment 8 is that in embodiment 8, component B is composed of the HDI prepolymer and HDI trimer components in embodiment 7 in a weight ratio of 1:3, and the NCO group content of component B is 19 wt %. The other steps remain unchanged.

[0112] Example 9

[0113] The difference between this embodiment and embodiment 8 is that in embodiment 8, component B is composed of the HDI prepolymer and HDI trimer components in embodiment 7 in a weight ratio of 1:5, and the NCO group content of component B is 20 wt %. The other steps remain unchanged.

[0114] Example 10

[0115] The difference between this embodiment and embodiment 5 is that in embodiment 5, component B is composed of HDI prepolymer and HDI trimer component in a weight ratio of 1:4, the NCO group content of component B is 19wt%, the NCO group content of HDI prepolymer is 7.5wt%, and the HDI prepolymer is prepared from HDI and polycarbonate triol with a number average molecular weight of 800. The other steps remain unchanged.

[0116] Embodiment 11

[0117] The difference between this embodiment and embodiment 4 is that in embodiment 4, butyl asparagine resin is replaced by isooctyl asparagine resin. The other steps remain unchanged.

[0118] Isooctyl asparagine resin is R in the above formula (1) 1 and R 2 All are isooctyl, X is a divalent organic structure remaining after removing two amino groups from 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, and n=2.

[0119] Comparative Example 4

[0120] The difference between this comparative example and Example 7 is that the isobutyl asparagine resin in Example 7 is replaced by an equal weight of F520 resin. The other steps remain unchanged.

[0121] The asparagus polyurea terrazzo floor compositions of Examples 4-10 and Comparative Example 4 were spread and compacted on the concrete surface to a thickness of 5 mm, and then cured and maintained.

[0122] The performance test results are shown in Table 2 below.

[0123] Table 2

[0124]

[0125]

[0126] It can be seen from the above data that the asparagus polyurea terrazzo floor composition of the present invention has good impact resistance after curing, and the combination of HDI prepolymer and HDI trimer is used as the curing agent, and the terrazzo floor has better impact resistance after curing.

[0127] As described above, the basic principles, main features and advantages of the present invention are shown and described. Those skilled in the art should understand that the present invention is not limited by the above embodiments, which are only preferred embodiments of the present invention and cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the scope of the present invention and the content of the specification should still be within the scope of the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A polyurea terrazzo floor composition, characterized in that: It includes component A, component B and component C; The A component comprises an aspartic acid ester resin as shown in the following formula (1): wherein X is selected from a polyvalent organic structure having a number average molecular weight of 50-5000 which is chemically inert to isocyanate groups at 100° C. after removing the amino groups from the polyvalent amino compound, R1 and R2 are selected from C2-C8 alkyl groups, and n=2-3; The molar percentage of C4-C8 alkyl in R1 and R2 is not less than 40% respectively; The B component is an isocyanate curing agent, and the isocyanate curing agent contains HDI trimer; The C component is aggregate; The weight ratio of the component A and the component B to the component C is 1:7-10.

2. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The weight proportion of the aspartic acid ester resin in the component A is not less than 90%.

3. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The component A further comprises one or a combination of two or more of a dispersant, an adhesion promoter, a pigment, a wetting agent, a leveling agent and a defoaming agent.

4. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The C4-C8 alkyl group is a branched structure.

5. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The isocyanate curing agent also contains HDI prepolymer; The HDI prepolymer is obtained by polymerizing HDI and polymer polyol; The polymer polyol molecule contains no less than 3 hydroxyl groups on average.

6. The asparagus polyurea terrazzo floor composition according to claim 5, characterized in that: The content of NCO groups in the isocyanate curing agent is 17-22.5 wt %.

7. The asparagus polyurea terrazzo floor composition according to claim 5, characterized in that: The content of NCO groups in the HDI prepolymer is 7-11 wt %.

8. The asparagus polyurea terrazzo floor composition according to claim 5, characterized in that: The number average molecular weight of the polymer polyol is 400-1200.

9. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The molar ratio of the NH groups in the A component to the NCO groups in the B component is 1:1-1.

2.

10. The asparagus polyurea terrazzo floor composition according to claim 1, characterized in that: The particle size of the aggregate is in the range of 0.05-10 mm.

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