A polyurethane composite material for repairing cracks in asphalt pavement

Abstract

The present application discloses a polyurethane composite material for repairing cracks in asphalt pavement, and relates to the technical field of grouting engineering. The polyurethane composite material includes component A, component B, and 0.1%-4% of the total weight of component A and component B. The composite agent nanographene, according to weight parts, component A includes 40-65 of polyether polyol, 0.1-3 parts of catalyst, 0.1-5 parts of polyoxyethylene nonionic surfactant, and 35-55 parts of diluent, and component B includes 50-60 parts of isocyanate, 20-30 parts of diluent, and 20-30 parts of flame retardant. This polyurethane composite material has better mechanical properties than the original polyurethane material, and fully meets the needs of repairing cracks in asphalt pavement. Therefore, the present application provides a polyurethane composite material for repairing cracks in asphalt pavement, which solves the technical problems of poor mechanical properties of polyurethane materials in the prior art and weak bonding performance with asphalt crack surfaces.

Description

Technical Field

[0001] The present application relates to the technical field of grouting engineering, and in particular to a polyurethane composite material for repairing cracks in asphalt pavement. Background Art

[0002] Asphalt pavement is often cracked due to vehicle load, temperature change, improper joint treatment and other reasons. Cracks are divided into static cracks and dynamic cracks according to their development status. In the repair of cracks in asphalt pavement, commonly used repair materials are asphalt, epoxy resin and polyurethane. Asphalt can fill cracks and provide good bonding strength. This material performs well in the repair of static cracks, but asphalt has limited crack resistance and will still crack after being subjected to vehicle cyclic loads. Therefore, it is not suitable for crack repair. Although epoxy resin has good strength, adhesion and wear resistance, because of its high hardness after curing, it will suddenly break after being subjected to certain cyclic loads, causing unpredictable dangerous events. Therefore, epoxy resin is not suitable for pavement crack repair. Although conventional polyurethane materials can improve the material's compression resistance, tensile resistance or flexibility by adjusting the content of different components, the improvement of a certain performance will inevitably reduce the performance of other aspects due to the adjustment of components. Therefore, the problem of crack repair has not been completely solved. When faced with stress changes caused by factors such as vehicle loads and temperature fluctuations in actual road use, the material needs to have good flexibility while maintaining good mechanical properties. The composite filling of nanomaterials has become a convenient way to solve this problem. Nanomaterials can fill a certain molecular space in materials with macromolecular structures, increasing the density of the material and thus comprehensively improving the performance of the material. Therefore, nanographene is used to perform composite modification on polyurethane. Through experiments, it can be found that the composite material has good compression resistance, tensile strength and bonding strength with crack materials after curing, which can meet the requirements of asphalt pavement crack repair. Summary of the invention

[0003] The purpose of the present application is to provide a polyurethane composite material for repairing cracks in asphalt pavement, so as to solve the technical problems in the prior art of poor performance of polyurethane materials and weak bonding performance with corresponding crack materials.

[0004] The present application provides a polyurethane composite material for repairing cracks in asphalt pavement. The polyurethane composite material comprises a component A, a component B and 0.1%-4% of the total weight of the component A and the component B as a composite agent nanographene. In terms of weight parts, the component A comprises 40-65 parts of a polyether polyol, 0.1-3 parts of a catalyst, 0.1-5 parts of a polyoxyethylene nonionic surfactant and 35-55 parts of a diluent, and the component B comprises 50-60 parts of an isocyanate, 20-30 parts of a diluent and 20-30 parts of a flame retardant.

[0005] Preferably, the weight of the composite nanographene is 2% of the total weight of the A component and the B component.

[0006] Preferably, in the component A, the catalyst comprises triethylamine.

[0007] Preferably, in the component A, the diluent comprises dibutyl phthalate.

[0008] Preferably, the polyether polyol includes polyether polyol DMN-1000 which is a polyether polyol with a functionality of 3 and a molecular weight of 1000, and polyether polyol DDL-200 which is a polyether polyol with a functionality of 2 and a number average molecular weight of 200Da, wherein the mass ratio of polyether polyol DMN-1000 to polyether polyol DDL-200 is 4:1.

[0009] Preferably, the polyoxyethylene nonionic surfactant includes alkylphenol polyoxyethylene ether.

[0010] Preferably, in the B component, the diluent comprises dimethyl carbonate.

[0011] Preferably, in the B component, the flame retardant comprises triester phosphate.

[0012] Preferably, in the B component, the isocyanate comprises toluene diisocyanate.

[0013] Therefore, the present application adopts the above-mentioned polyurethane composite material for repairing cracks in asphalt pavement, which has the following beneficial effects:

[0014] (1) In component A, compared with polyester polyols, polyether polyols have no easily hydrolyzed groups and their ether bonds are more flexible, so they have better water resistance and flexibility. The catalyst triethylamine can reduce the activation energy of the reaction and promote the self-polymerization reaction of isocyanate, thereby improving the mechanical properties of the material. The polyoxyethylene nonionic surfactant can improve the compatibility and stability of the components. This improvement helps the various components of the material to be fully mixed and penetrate into the cracks of the road surface. Dibutyl phthalate helps to increase the fluidity of the material, making the slurry have better fluidity and easier to pour into the cracks.

[0015] (2) Component B is mainly isocyanate, which reacts with polyether polyol to form carbamate. After the reaction is completed, carbamate and isocyanate are further cross-linked to form a stronger biuret group. In the reaction with isocyanate, polyether polyol provides more segments composed of carbon-carbon main chain polymer polyols, which makes the material have good toughness. Flame retardants make the material have excellent high temperature resistance, and together with diluents, reduce the viscosity of the system and enhance the fluidity of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A graph showing the change in pressure of the material of the present application with the content of nanographene;

[0017] Figure 2 A graph showing the variation of the tensile force of the material of the present application with the nanographene content;

[0018] Figure 3 This is a graph showing how the adhesion between the material of the present application and asphalt material changes with the nanographene content. DETAILED DESCRIPTION

[0019] Example 1

[0020] A polyurethane composite material for repairing cracks in asphalt pavement, the polyurethane composite material comprises component A, component B and 1% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 50 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 3 parts of triethylamine, 5 parts of alkylphenol polyoxyethylene ether and 42 parts of dibutyl phthalate, component B comprises 50 parts of toluene diisocyanate, 20 parts of dimethyl carbonate and 30 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and adhesion.

[0021] Example 2

[0022] A polyurethane composite material for repairing cracks in asphalt pavement, the polyurethane composite material comprises component A, component B and 1% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 60 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 0.1 parts of triethylamine, 0.2 parts of alkylphenol polyoxyethylene ether and 39.7 parts of dibutyl phthalate, component B comprises 60 parts of toluene diisocyanate, 20 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and adhesion.

[0023] Example 3

[0024] A polyurethane composite material for repairing cracks in asphalt pavement, the polyurethane composite material comprises component A, component B and 1% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 55 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and adhesion.

[0025] Example 4

[0026] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises a component A, a component B and a composite agent nanographene of 1% of the total weight of the components A and B. In terms of weight, the component A comprises: 55 parts of polyether polyol (the polyether polyol comprises a polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and a polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, and the component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure the pressure, tension and bonding force. The pressure is 78MPa, the tension is 8MPa, and the bonding force is 0.41MPa.

[0027] Example 5

[0028] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises component A, component B and 2% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 55 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are uniformly mixed, corresponding test specimens are made to measure pressure, tension and bonding force. The pressure is 85MPa, the tension is 10.4MPa, and the bonding force is 0.76MPa.

[0029] Example 6

[0030] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises a component A, a component B and a composite agent nanographene of 3% of the total weight of the components A and B. In terms of weight, the component A comprises: 55 parts of polyether polyol (the polyether polyol comprises a polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and a polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, and the component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are uniformly mixed, corresponding test specimens are made to measure the pressure, tension and bonding force. The pressure is 64MPa, the tension is 7MPa, and the bonding force is 0.5MPa.

[0031] Example 7

[0032] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises component A, component B and 4% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 55 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are uniformly mixed, corresponding test specimens are made to measure pressure, tension and bonding force. The pressure is 57MPa, the tension is 2.1MPa, and the bonding force is 0.36MPa.

[0033] Comparative Example 1

[0034] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises component A and component B by weight, component A comprises: 55 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 4:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and adhesion. For tension and adhesion, the pressure is 60MPa, the tension is 4.4MPa, and the adhesion is 0.21MPa.

[0035] Comparative Example 2

[0036] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises a component A, a component B and a composite agent nanographene of 2% of the total weight of the components A and B. In terms of weight, the component A comprises: 55 parts of polyether polyol (the polyether polyol comprises a polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and a polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 5:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, and the component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are uniformly mixed, corresponding test specimens are made to measure the pressure, tension and bonding force. The pressure is 82MPa, the tension is 9.8MPa, and the bonding force is 0.74MPa.

[0037] Comparative Example 3

[0038] A polyurethane composite material for repairing cracks in an asphalt pavement, the polyurethane composite material comprises a component A, a component B and a composite agent nanographene of 2% of the total weight of the components A and B. In terms of weight, the component A comprises: 55 parts of polyether polyol (the polyether polyol comprises a polyether polyol DMN-1000 with a functionality of 3 and a molecular weight of 1000 and a polyether polyol with a functionality of 2 and a number average molecular weight of 200Da in a mass ratio of 3:1), 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, and the component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are uniformly mixed, corresponding test specimens are made to measure the pressure, tension and bonding force. The pressure is 80MPa, the tension is 9.5MPa, and the bonding force is 0.72MPa.

[0039] Comparative Example 4

[0040] A polyurethane composite material for repairing cracks in asphalt pavement, the polyurethane composite material comprises component A, component B and 2% of the total weight of component A and component B as a composite agent nanographene, in terms of weight, component A comprises: 55 parts of polyester polyol, 2 parts of triethylamine, 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and bonding force. The pressure is 77MPa, the tension is 8.8MPa, and the bonding force is 0.66MPa.

[0041] Comparative Example 5

[0042] A polyurethane composite material for repairing cracks in asphalt pavement without a catalyst, the polyurethane composite material comprises component A, component B and 2% of the total weight of component A and component B, component A comprises: 55 parts of polyether polyol (polyether polyol comprises polyether polyol DMN-1000 with a molecular weight of 1000 and polyether polyol with a molecular weight of 200Da with a mass ratio of 4:1), 3 parts of alkylphenol polyoxyethylene ether and 40 parts of dibutyl phthalate, component B comprises 55 parts of toluene diisocyanate, 25 parts of dimethyl carbonate and 20 parts of triester phosphate. After the raw materials are evenly mixed, corresponding test specimens are made to measure pressure, tension and bonding force. The pressure is 72MPa, the tension is 8.4MPa, and the bonding force is 0.61MPa.

[0043] Therefore, the present application provides a polyurethane composite material for repairing cracks in asphalt pavement, which solves the technical problems in the prior art that the polyurethane material has poor mechanical properties and weak bonding performance with the asphalt crack surface.

[0044] In the description of this specification, the description with reference to the terms "an experimental example", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the experimental example or example are included in at least one experimental example or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same experimental example or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more experimental examples or examples in a suitable manner.

[0045] Finally, it should be noted that the above experimental examples are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred experimental examples, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A polyurethane composite material for repairing cracks in asphalt pavement, characterized in that: The polyurethane composite material comprises component A, component B and 1%-2% of the total weight of component A and component B as a composite agent nanographene. In terms of weight, component A comprises 40-65 parts of polyether polyol, 0.1-3 parts of catalyst, 0.1-5 parts of polyoxyethylene nonionic surfactant and 35-55 parts of diluent, and component B comprises 50-60 parts of isocyanate, 20-30 parts of diluent and 20-30 parts of flame retardant. The catalyst includes triethylamine; The polyether polyols include polyether polyol DMN-1000 which is a polyether polyol with a functionality of 3 and a molecular weight of 1000, and polyether polyol DDL-200 which is a polyether polyol with a functionality of 2 and a number average molecular weight of 200 Da, wherein the mass ratio of polyether polyol DMN-1000 to polyether polyol DDL-200 is 4:

1.

2. The polyurethane composite material for repairing cracks in asphalt pavement according to claim 1, characterized in that: In the A component, the diluent includes dibutyl phthalate.

3. The polyurethane composite material for repairing cracks in asphalt pavement according to claim 1, characterized in that: The polyoxyethylene nonionic surfactant includes alkylphenol polyoxyethylene ether.

4. The polyurethane composite material for repairing cracks in asphalt pavement according to claim 1, characterized in that: In the B component, the diluent includes dimethyl carbonate.

5. The polyurethane composite material for repairing cracks in asphalt pavement according to claim 1, characterized in that: In the B component, the flame retardant includes triester phosphate.

6. The polyurethane composite material for repairing cracks in asphalt pavement according to claim 1, characterized in that: In the B component, the isocyanate includes toluene diisocyanate.

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