Polyurethane concrete and preparation method thereof

Abstract

The invention relates to the field of building materials, and in particular to a polyurethane concrete and a preparation method thereof. The polyurethane concrete comprises the following components in parts by weight: 90-190 parts of a single-component polyurethane glue; 1-4 parts of a curing agent; 900-1150 parts of an aggregate; and 0.5-12 parts of a catalyst. The single-component polyurethane glue is prepared by diluting a prepolymer of a polyester polyol and an isocyanate with an active monomer, and the NCO content of the single-component polyurethane glue is 0.1-5wt %. The polyester polyol has a functionality of 2 and an average molecular weight of 1000-3000 g / mol, and is prepared by polymerizing a diol, a dibasic acid and a functional monomer, wherein the functional monomer comprises bisphenol A and liquid rubber, so that the concrete is resistant to high temperature, corrosion and aging, has a small shrinkage during construction and can be cured quickly, so as to solve the problem that the existing concrete does not have the aforementioned effects.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to polyurethane concrete and a preparation method thereof. Background Art

[0002] Road construction is the core of transportation infrastructure construction, among which cement concrete and asphalt concrete are commonly used construction materials, but they each have their limitations. Although cement concrete has high strength and low cost, it is prone to quality problems during construction and use, affecting structural strength and durability. Asphalt concrete has good flexibility and low noise characteristics, but its high temperature resistance, anti-aging performance and resistance to chemical substances are poor, which can easily lead to road deformation and cracking.

[0003] In view of the shortcomings of the above two traditional concrete materials, relevant scholars introduced polyurethane concrete. However, existing polyurethane concrete has limitations, such as poor compactness and low strength of polyurethane permeable concrete, and polyurethane organic polymer materials face challenges such as high temperature aging and ultraviolet aging, which in turn affect the durability of concrete. In addition, the isocyanate in polyurethane reacts with water to cause polyurethane foaming, reduce the density of concrete, and affect the mechanical strength. In response to these problems, there are currently related technologies to improve these problems, such as the "A method for preparing polyurethane concrete and its use for rapid repair of airport pavements" disclosed in the Chinese invention patent application with patent number CN202111196093.6 (publication number CN113845332A), the "An epoxy resin modified polyurethane concrete and its preparation method" disclosed in the Chinese invention patent application with patent number CN202210709555.8 (publication number CN114956664A), and the "An epoxy resin modified polyurethane concrete and its preparation method" disclosed in the Chinese invention patent application with patent number CN 201811221583.5 (publication number CN109439177A).

[0004] Although there are many technologies to improve polyurethane concrete, in order to solve the defects of polyurethane concrete, it is necessary to start from the design of polymer material formula and combine it with the preparation method of polyurethane concrete to solve it thoroughly. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a polyurethane concrete which is resistant to high temperature, corrosion and aging, has a small shrinkage during construction and can be cured quickly, in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned polyurethane concrete in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a polyurethane concrete, characterized in that it comprises the following components in parts by weight:

[0008] 90~190 parts of one-component polyurethane glue;

[0009] 1~4 parts of curing agent;

[0010] Aggregate 900~1150 parts;

[0011] Catalyst 0.5~12 parts;

[0012] The one-component polyurethane adhesive is prepared by diluting a prepolymer of polyester polyol and isocyanate with an active monomer, and the NCO content of the one-component polyurethane adhesive is 0.1-5wt%;

[0013] The polyester polyol has a functionality of 2 and an average molecular weight of 1000-3000 g / mol. It is polymerized from a diol or a diol substitute, a dibasic acid or a dibasic acid substitute and a functional monomer. The functional monomer includes bisphenol A and liquid rubber. The amount of bisphenol A added accounts for 10-20% of the mass of the polyester polyol, and the amount of liquid rubber added accounts for 5-15% of the mass of the polyester polyol.

[0014] Preferably, the active monomer is one or more of glycidyl acrylate, glycidyl methacrylate, N,N-dimethylaminoethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, and pentaerythritol triacrylate. The use of active monomers increases the crosslinking density and helps the bonding of the single-component polyurethane adhesive to the aggregate.

[0015] Preferably, the isocyanate is one or more of TDI (toluene diisocyanate), HDI (hexamethylene diisocyanate), and IPDI (isophorone diisocyanate).

[0016] Preferably, the diol is one or more of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and neopentyl glycol; the diol substitute is one or more of bisphenol A polyoxyethylene ether, bisphenol A polyoxypropylene ether, and hydroxyl-terminated liquid rubber.

[0017] Preferably, the dibasic acid is one or more of adipic acid, fumaric acid, isophthalic acid, and terephthalic acid; the dibasic acid substitute is one or more of maleic anhydride, phthalic anhydride, chlorendic anhydride, and carboxyl-terminated liquid rubber.

[0018] Preferably, the curing agent is prepared by mixing diol, petroleum ether, water and peroxide at room temperature, wherein the diol accounts for 30-40% of the mass of the curing agent, the petroleum ether accounts for 20-30% of the mass of the curing agent, the peroxide accounts for 20-40% of the mass of the curing agent, and the water accounts for 10-20% of the mass of the curing agent; the peroxide is used to ensure the activity of the curing agent, the diol is used to ensure the curing speed of the curing agent, and the advantages of such a ratio of diol, petroleum ether, water and peroxide are that the storage stability of the curing agent can be improved and the storage and transportation risks can be reduced;

[0019] The diol is one or more of ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol;

[0020] The peroxide is one or more of cumene hydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, hydrogen peroxide, and methyl ethyl ketone peroxide.

[0021] Preferably, the catalyst is one or more of triethylenediamine, dibutyltin dilaurate, cobalt isooctanoate, and N,N-dimethylaniline. The use of a catalyst can increase the reaction activity and accelerate the curing speed.

[0022] Preferably, the aggregate is one or more of basalt, limestone, granite, diabase, gold sand, and quartz sand, and the aggregate particle size ranges from 0 to 9.5 mm. The use of such aggregates with a certain gradation can make the polyurethane concrete have a more stable strength.

[0023] Preferably, the aggregate gradation of each level has a gradation range of: 90-100% through 9.5mm sieve hole, 53-90% through 4.75mm sieve hole, 34-75% through 2.36mm sieve hole, 22-65% through 1.18mm sieve hole, 15-53% through 0.6mm sieve hole, 8-25% through 0.3mm sieve hole, 3-13% through 0.15mm sieve hole, and 0-8% through 0.075mm sieve hole. Aggregate gradation generally adopts the aggregate gradation design of the maximum density stacking theory, and according to the distribution and shape characteristics of a specific batch of aggregates, the gradation is continuously optimized and improved on the theoretical basis through specific experiments.

[0024] The technical solution adopted by the present invention to solve the above second technical problem is: a method for preparing the above polyurethane concrete, characterized in that it comprises the following steps:

[0025] 1. Preparation of one-component polyurethane adhesive:

[0026] (1.1) Adding diol, dibasic acid and functional monomer into a reactor, reacting at 180°C to 220°C for 4 to 10 hours, to prepare a polyester polyol with a functionality of 2 and an average molecular weight of 1000 to 3000 g / mol;

[0027] (1.2) adding isocyanate and the polyester polyol prepared in step (1.1) into a reactor and reacting at 80° C. to 110° C. to prepare a prepolymer; when the NCO content of the obtained prepolymer is 0.1 to 5 wt %, adding an active monomer to dilute for 30 to 120 min to obtain the one-component polyurethane adhesive;

[0028] 2. Mixing the catalyst with the one-component polyurethane adhesive prepared in step 1 according to a certain proportion to obtain a pre-accelerated one-component polyurethane adhesive;

[0029] 3. Prepare curing agent: mix glycol, petroleum ether, water and peroxide in proportion at room temperature;

[0030] 4. Mix the pre-accelerated one-component polyurethane adhesive prepared in step 2 and the curing agent prepared in step 3 evenly, then add aggregates according to proportion, and mix evenly to obtain a polyurethane mixture;

[0031] 5. The polyurethane mixture of step 4 is formed by vibration leveling to finally form polyurethane concrete.

[0032] Compared with the prior art, the advantages of the present invention are as follows: the polyurethane concrete prepared by the present invention has the properties of high temperature resistance, corrosion resistance, aging resistance, extremely small construction shrinkage, rapid curing, high strength and high toughness. The specific reasons are as follows:

[0033] 1. The polyester polyol of the present invention is added with bisphenol A having excellent chemical stability, which can effectively resist the erosion of certain corrosive substances, thereby giving the material good corrosion resistance. At the same time, the addition of aromatic hydrocarbons helps to absorb ultraviolet rays, further improving the material's resistance to ultraviolet aging. In addition, the liquid rubber is introduced into the polyester through a chemical bond, so that the material has excellent ductility at low temperatures and improves its low-temperature toughness; at high temperatures, the liquid rubber segment gives the material a certain thermoplasticity, thereby improving the flexibility of the material at high temperatures.

[0034] 2. In the preparation of polyurethane concrete, the curing agent is combined with a catalyst pre-added in the one-component polyurethane adhesive to chemically react with the one-component polyurethane adhesive, and the purpose of preventing the polymer from shrinking is finally achieved through a balance between micro-foaming (micro-foaming of the NCO at the control end) and micro-contraction (free radical polymerization of the prepolymer (the prepolymer formed in step (1.2)) initiated by the peroxide); and the curing agent initiates free radical polymerization of the double bonds in the prepolymer chain segment and the double bonds of the active monomer, thereby increasing the crosslinking density of the polymer, improving the corrosion resistance of the material, and reducing the water permeability of the polyurethane pavement;

[0035] The catalyst is pre-added to the one-component polyurethane adhesive and can be stored for more than 3 months at room temperature. The curing agent is added during construction and the operating time at room temperature can be adjusted from 30 minutes to 3 hours. It has the characteristics of simple operation and convenient construction.

[0036] The final indicators of the polyurethane concrete prepared by the present invention are: compression resistance ≥45MPa, -10℃ low temperature bending strain ≥3000με, 70℃ bending strain ≥7000με, in the acid, alkali and salt corrosion environment, its surface does not crack, no particles fall off, the strength is stable, and it can effectively resist the damage of corrosive substances such as salt. The tensile strength of polyurethane adhesive (mixed with single-component polyurethane adhesive, curing agent and catalyst) at 50℃ is ≥15MPa, and the elongation at break is ≥50%. The polyurethane mixture (polyurethane adhesive and aggregate are evenly mixed) does not crack after 10 million fatigue tests at 70℃, and the rutting dynamic stability at 80℃ is ≥23000 times / mm. The construction shrinkage is extremely small, and it has high density (concrete shrinkage rate is 600*10 -6 ) and strength.

[0037] In addition, the polyurethane concrete also has excellent aging performance. After 60 years of environmental erosion such as ultraviolet radiation and thermal aging in low-altitude areas, its strength does not decrease significantly and its water permeability coefficient is 0, ensuring stability under long-term environmental erosion and preventing peeling or cracking, thereby significantly extending the service life of the road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a gradation diagram of the aggregate in the following examples. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with specific embodiments. Example 1

[0040] The polyurethane concrete of this embodiment includes the following components in parts by weight:

[0041] 140 parts of one-component polyurethane adhesive; 2.5 parts of curing agent; 900 parts of aggregate; 0.5 parts of catalyst.

[0042] The preparation method of the polyurethane concrete of this embodiment comprises the following steps:

[0043] 1. Preparation of one-component polyurethane adhesive:

[0044] (1.1) Adding diol, dibasic acid and functional monomer into a reactor, reacting at 180°C-200°C for 4 hours, to prepare a polyester polyol with a functionality of 2 and an average molecular weight between 1000-1400 g / mol;

[0045] The diols are ethylene glycol and diethylene glycol, the dibasic acids are adipic acid, maleic acid and phthalic anhydride, and the functional monomers are bisphenol A and liquid rubber, including 120g of ethylene glycol, 450g of diethylene glycol, 220g of adipic acid, 150g of maleic anhydride, 150g of phthalic anhydride, 450g of bisphenol A and 130g of liquid rubber.

[0046] (1.2) adding isocyanate and the polyester polyol prepared in step (1.1) into a reactor and reacting at 80°C-110°C; when the NCO content of the obtained prepolymer is 0.1-2.3wt%, adding active monomers to dilute for 30 minutes, thereby obtaining the one-component polyurethane adhesive; the active monomers are methyl methacrylate and diethylene glycol dimethacrylate; the isocyanate is TDI; wherein the polyester polyol is 866g, TDI is 140g, methyl methacrylate is 200g, and diethylene glycol dimethacrylate is 450g.

[0047] 2. Mix the catalyst with the one-component polyurethane adhesive prepared in the above step 1 in proportion to obtain a pre-accelerated one-component polyurethane adhesive; the catalyst is triethylenediamine and cobalt isooctanoate, wherein triethylenediamine is 3g and cobalt isooctanoate is 0.1g.

[0048] 3. Prepare curing agent: mix glycol, petroleum ether, water and peroxide in proportion at room temperature;

[0049] The diol accounts for 36% of the mass of the curing agent, petroleum ether accounts for 20% of the mass of the curing agent, the peroxide accounts for 30% of the mass of the curing agent, and water accounts for 10% of the mass of the curing agent; the diol is ethylene glycol, and the peroxide is cumene hydroperoxide;

[0050] 4. The pre-accelerated one-component polyurethane adhesive prepared in step 2 and the curing agent prepared in step 3 are mixed evenly according to a certain proportion, and then aggregate is added according to a certain proportion. After mixing evenly, a polyurethane mixture is obtained; the aggregate is quartz sand, and the aggregate particle size ranges from 0 to 9.5 mm;

[0051] The gradation of each grade of aggregate is gradation 1, specifically: the pass rate of 9.5mm sieve hole is 95%, the pass rate of 4.75mm sieve hole is 71%, the pass rate of 2.36mm sieve hole is 52%, the pass rate of 1.18mm sieve hole is 41%, the pass rate of 0.6mm sieve hole is 29%, the pass rate of 0.3mm sieve hole is 15%, the pass rate of 0.15mm sieve hole is 7%, and the pass rate of 0.075mm sieve hole is 4%.

[0052] 5. The polyurethane mixture of step 4 is formed by vibration leveling to finally form polyurethane concrete. Example 2

[0053] The polyurethane concrete of this embodiment includes the following components in parts by weight:

[0054] 90 parts of one-component polyurethane adhesive; 1 part of curing agent; 1000 parts of aggregate; 2.5 parts of catalyst.

[0055] The preparation method of the polyurethane concrete of this embodiment comprises the following steps:

[0056] 1. Preparation of one-component polyurethane adhesive:

[0057] (1.1) Adding diol, dibasic acid and functional monomer into a reactor, reacting at 190°C-210°C for 7 hours, to prepare a polyester polyol with a functionality of 2 and an average molecular weight of 1800-2200 g / mol;

[0058] The diols are diethylene glycol and propylene glycol, the dibasic acids are adipic acid, isophthalic acid and maleic anhydride, and the functional monomers are bisphenol A and liquid rubber, including 330g of diethylene glycol, 170g of propylene glycol, 200g of adipic acid, 160g of isophthalic acid, 140g of maleic anhydride, 400g of bisphenol A, and 160g of liquid rubber.

[0059] (1.2) adding isocyanate and the polyester polyol prepared in step (1.1) into a reactor and reacting at 80°C-110°C; when the NCO content of the obtained prepolymer is 1.8-3.6wt%, adding active monomers to dilute for 80 minutes, thereby obtaining the one-component polyurethane adhesive; the active monomers are glycidyl methacrylate, N,N-dimethylaminoethyl methacrylate and 1,6-hexanediol diacrylate; the isocyanate is TDI; wherein the polyester polyol is 910g, TDI is 125g, glycidyl methacrylate is 50g, N,N-dimethylaminoethyl methacrylate is 400g, and 1,6-hexanediol diacrylate is 150g.

[0060] 2. Mix the catalyst with the one-component polyurethane adhesive prepared in the above step 1 in proportion to obtain a pre-accelerated one-component polyurethane adhesive; the catalyst is cobalt isooctanoate, and the amount used is 0.2g.

[0061] 3. Prepare curing agent: mix glycol, petroleum ether, water and peroxide in proportion at room temperature;

[0062] The diol accounts for 30% of the mass of the curing agent, petroleum ether accounts for 24% of the mass of the curing agent, the peroxide accounts for 20% of the mass of the curing agent, and water accounts for 15% of the mass of the curing agent; the diol is ethylene glycol, and the peroxide is hydrogen peroxide;

[0063] 4. Mix the pre-accelerated one-component polyurethane adhesive prepared in step 2 and the curing agent prepared in step 3 in proportion, then add aggregate in proportion, and mix well to obtain a polyurethane mixture;

[0064] The aggregate is quartz sand, and the aggregate particle size range is 0~9.5mm; the gradation of each grade of aggregate is gradation 2, specifically: the 9.5mm sieve hole pass rate is 91%, the 4.75mm sieve hole pass rate is 55%, the 2.36mm sieve hole pass rate is 37%, the 1.18mm sieve hole pass rate is 29%, the 0.6mm sieve hole pass rate is 19%, the 0.3mm sieve hole pass rate is 10%, the 0.15mm sieve hole pass rate is 5%, and the 0.075mm sieve hole pass rate is 2%.

[0065] 5. The polyurethane mixture of step 4 is formed by vibration leveling to finally form polyurethane concrete. Example 3

[0066] The polyurethane concrete of this embodiment includes the following components in parts by weight:

[0067] 190 parts of one-component polyurethane adhesive; 4 parts of curing agent; 1150 parts of aggregate; 12 parts of catalyst.

[0068] The preparation method of the polyurethane concrete of this embodiment comprises the following steps:

[0069] 1. Preparation of one-component polyurethane adhesive:

[0070] (1.1) Adding diol, dibasic acid and functional monomer into a reactor, reacting at 200°C-220°C for 10 hours, and preparing polyester polyol with a functionality of 2 and an average molecular weight of 2600-3000 g / mol;

[0071] The diols are propylene glycol and dipropylene glycol, the dibasic acids are terephthalic acid, fumaric acid and adipic acid, and the functional monomers are bisphenol A and liquid rubber, including 170g of propylene glycol, 310g of dipropylene glycol, 150g of terephthalic acid, 170g of fumaric acid, 210g of adipic acid, 230g of bisphenol A and 60g of liquid rubber.

[0072] (1.2) adding isocyanate and the polyester polyol prepared in step (1.1) into a reactor and reacting at 80°C-110°C; when the NCO content of the obtained prepolymer is 3.2-5wt%, adding active monomers to dilute for 120 minutes, thereby obtaining the one-component polyurethane adhesive; the active monomers are glycidyl methacrylate, ethylene glycol dimethacrylate, trimethylolpropane triacrylate and pentaerythritol triacrylate; the isocyanate is HDI; wherein the polyester polyol is 875g, HDI is 125g, glycidyl methacrylate is 400g, ethylene glycol dimethacrylate is 130g, trimethylolpropane triacrylate is 150g, and pentaerythritol triacrylate is 100g.

[0073] 2. Mix the catalyst with the one-component polyurethane adhesive prepared in the above step 1 in proportion to obtain a pre-accelerated one-component polyurethane adhesive; the catalyst is cobalt isooctanoate, and the amount used is 0.2g.

[0074] 3. Prepare curing agent: mix glycol, petroleum ether, water and peroxide in proportion at room temperature;

[0075] The diol accounts for 40% of the mass of the curing agent, petroleum ether accounts for 30% of the mass of the curing agent, the peroxide accounts for 40% of the mass of the curing agent, and water accounts for 20% of the mass of the curing agent; the diol is ethylene glycol, and the peroxide is methyl ethyl ketone peroxide;

[0076] 4. The pre-accelerated one-component polyurethane adhesive prepared in step 2 and the curing agent prepared in step 3 are mixed evenly according to a certain proportion, and then aggregate is added according to a certain proportion. After mixing evenly, a polyurethane mixture is obtained; the aggregate is quartz sand, and the aggregate particle size ranges from 0 to 9.5 mm;

[0077] The gradation of each grade of aggregate is gradation 3, specifically: the pass rate of 9.5mm sieve hole is 100%, the pass rate of 4.75mm sieve hole is 85%, the pass rate of 2.36mm sieve hole is 67%, the pass rate of 1.18mm sieve hole is 58%, the pass rate of 0.6mm sieve hole is 46%, the pass rate of 0.3mm sieve hole is 22%, the pass rate of 0.15mm sieve hole is 11%, and the pass rate of 0.075mm sieve hole is 7%.

[0078] 5. The polyurethane mixture of step 4 is formed by vibration leveling to finally form polyurethane concrete.

[0079] In step 5 of the above three embodiments, the vibration leveling method is a prior art and will not be described in detail here.

[0080] The performance test results of the polyurethane adhesive and polyurethane concrete prepared in the above three embodiments are shown in the following table:

[0081]

[0082] The polyurethane adhesive in the above table is formed by mixing a single-component polyurethane adhesive, a curing agent, and a catalyst; polyurethane concrete is formed by adding aggregate to the polyurethane adhesive, mixing, and vibrating to level it.

Claims

1. A polyurethane concrete, characterized in that: The composition comprises the following components in parts by weight: 90~190 parts of one-component polyurethane glue; 1~4 parts of curing agent; Aggregate 900~1150 parts; Catalyst 0.5~12 parts; The one-component polyurethane adhesive is prepared by diluting a prepolymer of polyester polyol and isocyanate with an active monomer, and the NCO content of the one-component polyurethane adhesive is 0.1-5wt%; The polyester polyol has a functionality of 2 and an average molecular weight of 1000-3000 g / mol, and is polymerized from a diol or a diol substitute, a dibasic acid or a dibasic acid substitute, and a functional monomer, wherein the functional monomer comprises bisphenol A and liquid rubber, wherein the amount of bisphenol A added accounts for 10-20% of the mass of the polyester polyol, and the amount of liquid rubber added accounts for 5-15% of the mass of the polyester polyol; the diol substitute is one or more of bisphenol A polyoxyethylene ether, bisphenol A polyoxypropylene ether, and hydroxyl-terminated liquid rubber, and the dibasic acid substitute is one or more of maleic anhydride, phthalic anhydride, chlorendic anhydride, and carboxyl-terminated liquid rubber; The active monomer is one or more of glycidyl acrylate, glycidyl methacrylate, N,N-dimethylaminoethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, and pentaerythritol triacrylate; The curing agent is prepared by mixing diol, petroleum ether, water and peroxide at room temperature, wherein the diol accounts for 30-40% of the mass of the curing agent, the petroleum ether accounts for 20-30% of the mass of the curing agent, the peroxide accounts for 20-40% of the mass of the curing agent, and the water accounts for 10-20% of the mass of the curing agent; The diol of the curing agent is one or more of ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol; The peroxide is one or more of cumene hydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, hydrogen peroxide, and methyl ethyl ketone peroxide.

2. The polyurethane concrete according to claim 1, characterized in that: The isocyanate is one or more of toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

3. The polyurethane concrete according to claim 1, characterized in that: The diol of the polyester polyol is one or more of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol and neopentyl glycol.

4. The polyurethane concrete according to claim 1, characterized in that: The dibasic acid is one or more of adipic acid, fumaric acid, isophthalic acid and terephthalic acid.

5. The polyurethane concrete according to claim 1, characterized in that: The catalyst is one or more of triethylenediamine, dibutyltin dilaurate, cobalt isooctanoate, and N,N-dimethylaniline.

6. The polyurethane concrete according to any one of claims 1 to 5, characterized in that: The aggregate is one or more of basalt, limestone, granite, diabase, gold sand, and quartz sand, and the aggregate particle size ranges from 0 to 9.5 mm.

7. The polyurethane concrete according to claim 6, characterized in that: The aggregate grading of each grade has a grading range of: 9.5mm sieve hole pass rate is 90-100%, 4.75mm sieve hole pass rate is 53-90%, 2.36mm sieve hole pass rate is 34-75%, 1.18mm sieve hole pass rate is 22-65%, 0.6mm sieve hole pass rate is 15-53%, 0.3mm sieve hole pass rate is 8-25%, 0.15mm sieve hole pass rate is 3-13%, and 0.075mm sieve hole pass rate is 0-8%.

8. A method for preparing the polyurethane concrete according to any one of claims 1 to 7, characterized in that: The steps include:

1. Preparation of one-component polyurethane adhesive: (1.1) Adding diol, dibasic acid and functional monomer into a reactor, reacting at 180°C to 220°C for 4 to 10 hours, to prepare a polyester polyol with a functionality of 2 and an average molecular weight of 1000 to 3000 g / mol; (1.2) adding isocyanate and the polyester polyol prepared in step (1.1) into a reactor and reacting at 80° C. to 110° C. to prepare a prepolymer; when the NCO content of the obtained prepolymer is 0.1 to 5 wt %, adding an active monomer to dilute for 30 to 120 min to obtain the one-component polyurethane adhesive; 2. Mixing the catalyst with the one-component polyurethane adhesive prepared in step 1 according to a certain proportion to obtain a pre-accelerated one-component polyurethane adhesive; 3. Prepare curing agent: mix glycol, petroleum ether, water and peroxide in proportion at room temperature; 4. Mix the pre-accelerated one-component polyurethane adhesive prepared in step 2 and the curing agent prepared in step 3 evenly, then add aggregates according to proportion, and mix evenly to obtain a polyurethane mixture; 5. The polyurethane mixture of step 4 is formed by vibration leveling to finally form polyurethane concrete.

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