Self-repairing polyurethane material for large-span steel bridge deck and preparation method of self-repairing polyurethane material

Abstract

The invention relates to the technical field of high polymer materials, in particular to a self-repairing polyurethane material for a large-span steel bridge floor and a preparation method of the self-repairing polyurethane material. Polyisocyanate has the characteristics of high strength and tear resistance, can meet the requirements of a bridge floor material on mechanical properties, preferably aromatic polyisocyanate or aliphatic and alicyclic polyisocyanate, and has the advantages of high strength, high tear resistance, high mechanical property, high mechanical property and the like. The polyurethane material can meet the requirements for the performance of the bridge deck material under different environmental conditions, meanwhile, polyether polyol and polyester polyol are introduced as soft segment parts of the polyurethane material, so that the polyurethane material has enough strength and good flexibility, the problem that an existing polyurethane material is insufficient in rigidity and flexibility is solved, and finally by adding a chain extender, the rigidity and flexibility of the bridge deck material are improved. The cross-linking density of the polyurethane material can be increased, the strength and wear resistance of the material are improved, and the polyurethane material adopting the technical scheme has the characteristics of high strength, tear resistance, wear resistance, good flexibility, strong stress strain resistance, excellent high-temperature and low-temperature performance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a self-healing polyurethane material for the deck of a long-span steel bridge and a preparation method thereof. Background Art

[0002] As an important part of the modern transportation network, the selection of the deck material for a long-span steel bridge is crucial. Traditional deck materials such as concrete and asphalt are prone to problems such as cracking and spalling under long-term loads and environmental factors, affecting the flatness of the deck and driving safety. Polyurethane materials have gradually been applied in the field of deck repair due to their high strength, tear resistance, wear resistance, etc.

[0003] However, existing polyurethane materials often have problems such as insufficient rigidity and flexibility, weak stress and strain resistance, and poor high and low temperature performance, making it difficult to meet the requirements of the complex and changeable service environment of the long-span steel bridge deck. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-healing polyurethane material for the deck of a long-span steel bridge and a preparation method thereof, so as to solve the problems that existing polyurethane materials for the self-healing of long-span steel bridge decks often have insufficient rigidity and flexibility, weak stress and strain resistance, and poor high and low temperature performance, and it is difficult to meet the requirements of the complex and changeable service environment of the long-span steel bridge deck.

[0005] To achieve the above purpose, the present invention provides a self-healing polyurethane material for the deck of a long-span steel bridge. The self-healing polyurethane material for the deck of a long-span steel bridge comprises the following in percentage: 30%-45% of polyisocyanate, 10%-30% of polyether polyol, 10%-30% of polyester polyol, 5%-15% of chain extender, and 0.5%-5% of additive. The polyisocyanate is preferably aromatic polyisocyanate or aliphatic and alicyclic polyisocyanate. The polyether polyol is preferably polytetrahydrofuran diol. The polyester polyol is preferably aromatic polyester polyol. The chain extender is preferably a small molecule alcohol or ether alcohol with two or more hydroxyl groups.

[0006] Among them, when the polyisocyanate is aromatic polyisocyanate, toluene diisocyanate (TDI) is preferred;

[0007] When the polyisocyanate is aliphatic and alicyclic polyisocyanate, a mixed system of isophorone diisocyanate (IPDI) and 1,6-hexamethylene diisocyanate (HDI) is preferred. The mixing ratio of isophorone diisocyanate (IPDI) and 1,6-hexamethylene diisocyanate (HDI) is specifically 1:1 to 3:1.

[0008] Among them, the ratio of the polyether polyol to the polyester polyol is specifically 1:3 to 3:1.

[0009] Among them, the additive includes a catalyst, a thermal-oxidative aging inhibitor, a photo-aging inhibitor, a wetting agent and a leveling agent. The catalyst accounts for 10%-30% of the total amount of the additive, the thermal-oxidative aging inhibitor accounts for 20%-40% of the total amount of the additive, the photo-aging inhibitor accounts for 10%-20% of the total amount of the additive, the wetting agent accounts for 5%-15% of the total amount of the additive, and the leveling agent accounts for 5%-15% of the total amount of the additive.

[0010] The present invention also provides a preparation method of a self-healing polyurethane material for a long-span steel bridge deck, which is used to prepare the self-healing polyurethane material for a long-span steel bridge deck as described above, and includes the following steps:

[0011] Add the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction vessel, and react for 2 to 4 hours under stirring and heating conditions until a prepolymer is formed;

[0012] Add the chain extender into the reaction vessel containing the prepolymer, and react for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed;

[0013] After cooling, curing and surface treatment of the obtained polyurethane structure, the self-healing polyurethane material for the long-span steel bridge deck is obtained.

[0014] Among them, in the step "Add the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction vessel, and react for 2 to 4 hours under stirring and heating conditions until a prepolymer is formed", the stirring speed is 600 to 1000 revolutions per minute, and the reaction temperature is 60 to 80 °C.

[0015] Among them, in the step "Add the chain extender into the reaction vessel containing the prepolymer, and react for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed", the stirring speed is 300 to 900 revolutions per minute, and the reaction temperature is 70 to 90 °C.

[0016] Among them, the specific content of the step "After cooling, curing and surface treatment of the obtained polyurethane structure, the self-healing polyurethane material for the long-span steel bridge deck is obtained" includes:

[0017] Cooling: Remove the reaction vessel from the heating device and let it cool naturally to room temperature;

[0018] Curing: Pour the cooled polyurethane material into a mold for curing;

[0019] Surface treatment: Perform surface treatment on the cured polyurethane material;

[0020] Quality inspection: Conduct quality inspection on the prepared self-healing polyurethane material.

[0021] A self-healing polyurethane material for the deck of a long-span steel bridge and its preparation method according to the present invention. The polyisocyanate has the characteristics of high strength and tear resistance, which can meet the mechanical property requirements of the deck material. Preferably, aromatic polyisocyanate or aliphatic and alicyclic polyisocyanates are used, which have excellent weather resistance and flexibility respectively, and can meet the performance requirements of the deck material under different environmental conditions. At the same time, the polyether polyol and the polyester polyol are introduced as the soft segment part of the polyurethane material, so that the polyurethane material has sufficient strength and good flexibility, solving the problem of insufficient rigidity and flexibility of the existing polyurethane materials. Finally, through the addition of the chain extender, the crosslinking density of the polyurethane material can be increased, improving the strength and wear resistance of the material. In summary, the self-healing polyurethane material for the deck of a long-span steel bridge provided by this technical solution has the characteristics of high strength, tear resistance, wear resistance, good flexibility, strong stress and strain resistance, excellent high and low temperature performance, etc. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is the flowchart of the steps of the preparation method of the self-healing polyurethane material for the deck of a long-span steel bridge provided by the present invention.

[0024] Figure 2 is the flowchart of the steps of the preparation method of the self-healing polyurethane material for the deck of a long-span steel bridge in Example 1 provided by the present invention.

[0025] Figure 3 is the flowchart of the steps of the preparation method of the self-healing polyurethane material for the deck of a long-span steel bridge in Example 2 provided by the present invention.

[0026] Figure 4 is the flowchart of the steps of the preparation method of the self-healing polyurethane material for the deck of a long-span steel bridge in Example 3 provided by the present invention. Detailed Description of the Embodiments

[0027] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0028] The present invention provides a self-healing polyurethane material for the deck of a long-span steel bridge. The self-healing polyurethane material for the deck of a long-span steel bridge comprises the following components by percentage: 30%-45% of polyisocyanate, 10%-30% of polyether polyol, 10%-30% of polyester polyol, 5%-15% of chain extender, and 0.5%-5% of additive. The polyisocyanate is preferably aromatic polyisocyanate or aliphatic and alicyclic polyisocyanate. The polyether polyol is preferably polytetrahydrofuran diol. The polyester polyol is preferably aromatic polyester polyol. The chain extender is preferably a small molecule alcohol or ether alcohol with two or more hydroxyl groups.

[0029] In this embodiment, the polyisocyanate has the characteristics of high strength and tear resistance, and can meet the requirements of the deck material for mechanical properties. And preferably aromatic polyisocyanate or aliphatic and alicyclic polyisocyanate, which respectively have excellent weather resistance and flexibility, and can meet the performance requirements of the deck material under different environmental conditions. At the same time, the polyether polyol and the polyester polyol are introduced as the soft segment part of the polyurethane material, so that the polyurethane material has sufficient strength and good flexibility, solving the problem of insufficient rigidity and flexibility of the existing polyurethane material. Finally, by adding the chain extender, the crosslinking density of the polyurethane material can be increased, and the strength and wear resistance of the material can be improved. In summary, the self-healing polyurethane material for the deck of a long-span steel bridge provided by this technical solution has the characteristics of high strength, tear resistance, wear resistance, good flexibility, strong stress and strain resistance, and excellent high and low temperature performance.

[0030] Further, when the polyisocyanate is aromatic polyisocyanate, toluene diisocyanate (TDI) is preferred;

[0031] When the polyisocyanate is aliphatic and alicyclic polyisocyanate, a mixed system of isophorone diisocyanate (IPDI) and 1,6-hexamethylene diisocyanate (HDI) is preferred. The mixing ratio of isophorone diisocyanate (IPDI) and 1,6-hexamethylene diisocyanate (HDI) is specifically 1:1 to 3:1.

[0032] Further, the ratio of the polyether polyol to the polyester polyol is specifically 1:3 to 3:1.

[0033] Further, the additive includes a catalyst, a thermal oxidation inhibitor, a light aging inhibitor, a wetting agent and a leveling agent. The catalyst accounts for 10%-30% of the total amount of the additive, the thermal oxidation inhibitor accounts for 20%-40% of the total amount of the additive, the light aging inhibitor accounts for 10%-20% of the total amount of the additive, the wetting agent accounts for 5%-15% of the total amount of the additive, and the leveling agent accounts for 5%-15% of the total amount of the additive.

[0034] In this embodiment, by providing the catalyst, the thermal-oxidative aging resistant agent, the photo-aging resistant agent, the wetting agent and the leveling agent, the curing speed, the thermal-oxidative aging resistance, the photo-aging resistance, the wettability and the leveling property of the polyurethane material can be improved respectively, thereby comprehensively enhancing the comprehensive performance of the material.

[0035] Please refer to Figure 1 , and a method for preparing a self-healing polyurethane material for a long-span steel bridge deck is also provided, which is used to prepare the self-healing polyurethane material for a long-span steel bridge deck as described above, and includes the following steps:

[0036] S1: Add the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction vessel, and react for 2 to 4 hours under stirring and heating conditions until a prepolymer is formed;

[0037] S2: Add the chain extender into the reaction vessel containing the prepolymer, and react for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed;

[0038] S3: After cooling, curing and surface treatment of the obtained polyurethane structure, the self-healing polyurethane material for the long-span steel bridge deck is obtained.

[0039] Further, in the step "Add the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction vessel, and react for 2 to 4 hours under stirring and heating conditions until a prepolymer is formed", the stirring speed is 600 to 1000 revolutions per minute, and the reaction temperature is 60 to 80 °C.

[0040] Further, in the step "Add the chain extender into the reaction vessel containing the prepolymer, and react for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed", the stirring speed is 300 to 900 revolutions per minute, and the reaction temperature is 70 to 90 °C.

[0041] Further, the specific content of the step "After cooling, curing and surface treatment of the obtained polyurethane structure, the self-healing polyurethane material for the long-span steel bridge deck is obtained" includes:

[0042] Cooling: Remove the reaction vessel from the heating device and let it cool naturally to room temperature;

[0043] Curing: Pour the cooled polyurethane material into a mold for curing;

[0044] Surface treatment: Perform surface treatment on the cured polyurethane material;

[0045] Quality inspection: Perform quality inspection on the prepared self-healing polyurethane material.

[0046] In this embodiment, first, the polyisocyanate, the polyether polyol, the polyester polyol, and the additive are added to a reaction vessel. Under the conditions of stirring and heating, the reaction is carried out for 2 to 4 hours until a prepolymer is formed. Then, the chain extender is added to the reaction vessel containing the prepolymer. Under the conditions of stirring and heating, the reaction is carried out for 1 to 3 hours until a polyurethane structure is formed. Finally, the prepared polyurethane structure is cooled, cured, and surface-treated to obtain the large-span steel bridge deck self-healing polyurethane material. The large-span steel bridge deck self-healing polyurethane material prepared by this technical solution has the characteristics of high strength, tear resistance, wear resistance, good flexibility, strong stress and strain resistance, and excellent high and low temperature performance.

[0047] Example 1:

[0048] Please refer to Figure 2 , the present invention also provides a method for preparing a large-span steel bridge deck self-healing polyurethane material for preparing the large-span steel bridge deck self-healing polyurethane material as described above, including the following steps:

[0049] S101: Add the toluene diisocyanate TDI accounting for 35% of the total amount of the polyurethane material, the polytetrahydrofuran diol accounting for 20% of the total amount of the polyurethane material, the aromatic polyester polyol accounting for 25% of the total amount of the polyurethane material, and the additive accounting for 1% of the total amount of the polyurethane material to a reaction vessel. Under the conditions of a stirring speed of 600 revolutions per minute and a stirring temperature of 60 °C, the reaction is carried out for 2 hours until a prepolymer is formed;

[0050] S102: Add the dihydroxy alcohol accounting for 19% of the total amount of the polyurethane material to the reaction vessel containing the prepolymer. Under the conditions of a stirring speed of 300 revolutions per minute and a stirring temperature of 70 °C, the reaction is carried out for 1 hour until a polyurethane structure is formed;

[0051] S103: After cooling, curing, and surface-treating the prepared polyurethane structure, the large-span steel bridge deck self-healing polyurethane material is obtained.

[0052] Example 2:

[0053] Please refer to Figure 3 , the present invention also provides a method for preparing a large-span steel bridge deck self-healing polyurethane material for preparing the large-span steel bridge deck self-healing polyurethane material as described above, including the following steps:

[0054] S201: Add the mixture system of isophorone diisocyanate (IPDI) and 1,6 - hexamethylene diisocyanate (HDI) (mixing ratio is 2:1), which accounts for 40% of the total amount of polyurethane material, the polytetrahydrofuran diol that accounts for 25% of the total amount of polyurethane material, the aromatic polyester polyol that accounts for 23% of the total amount of polyurethane material, and the additive that accounts for 2% of the total amount of polyurethane material into the reaction vessel. Under the conditions of a stirring speed of 800 revolutions per minute and a stirring temperature of 70 °C, react for 3 hours until a prepolymer is formed;

[0055] S202: Add the polyhydroxy ether alcohol that accounts for 10% of the total amount of polyurethane material into the reaction vessel containing the prepolymer. Under the conditions of a stirring speed of 600 revolutions per minute and a stirring temperature of 80 °C, react for 2 hours until a polyurethane structure is formed;

[0056] S203: After cooling, curing and surface treatment of the obtained polyurethane structure, the self - healing polyurethane material for the long - span steel bridge deck is obtained.

[0057] Example 3:

[0058] Please refer to Figure 4 , the present invention also provides a preparation method of the self - healing polyurethane material for the long - span steel bridge deck, which is used to prepare the self - healing polyurethane material for the long - span steel bridge deck as described above, and includes the following steps:

[0059] S301: Add the toluene diisocyanate (TDI) that accounts for 45% of the total amount of polyurethane material, the polytetrahydrofuran diol that accounts for 10% of the total amount of polyurethane material, the aromatic polyester polyol that accounts for 30% of the total amount of polyurethane material, and the additive that accounts for 5% of the total amount of polyurethane material into the reaction vessel. Under the conditions of a stirring speed of 1000 revolutions per minute and a stirring temperature of 80 °C, react for 4 hours until a prepolymer is formed;

[0060] S302: Add the dihydroxy alcohol that accounts for 10% of the total amount of polyurethane material into the reaction vessel containing the prepolymer. Under the conditions of a stirring speed of 900 revolutions per minute and a stirring temperature of 90 °C, react for 3 hours until a polyurethane structure is formed;

[0061] S303: After cooling, curing and surface treatment of the obtained polyurethane structure, the self - healing polyurethane material for the long - span steel bridge deck is obtained.

[0062] The above - disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of the above - mentioned embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A self-repairing polyurethane material for a long-span steel bridge deck, characterized in that: The composition comprises the following percentages: 30%-45% of polyisocyanate, 10%-30% of polyether polyol, 10%-30% of polyester polyol, 5%-15% of chain extender and 0.5%-5% of additives. The polyisocyanate is preferably aromatic polyisocyanate or aliphatic and alicyclic polyisocyanate, the polyether polyol is preferably polytetramethylene glycol, the polyester polyol is preferably aromatic polyester polyol, and the chain extender is preferably a small molecule alcohol or ether alcohol with dihydric or polyhydric hydroxyl groups.

2. The long-span steel bridge deck self-repairing polyurethane material according to claim 1, characterized in that: When the polyisocyanate is an aromatic polyisocyanate, toluene diisocyanate TDI is preferred; When the polyisocyanate is an aliphatic or alicyclic polyisocyanate, a mixed system of isophorone diisocyanate IPDI and 1,6-hexamethylene diisocyanate HDI is preferred, and the mixing ratio of isophorone diisocyanate IPDI and 1,6-hexamethylene diisocyanate HDI is specifically 1:1 to 3:

1.

3. The long-span steel bridge deck self-repairing polyurethane material according to claim 2, characterized in that: The ratio of the polyether polyol to the polyester polyol is specifically 1:3 to 3:

1.

4. The long-span steel bridge deck self-repairing polyurethane material according to claim 3, characterized in that: The additives include catalysts, thermal oxidative aging inhibitors, light aging inhibitors, wetting agents and leveling agents, wherein the catalyst accounts for 10%-30% of the total amount of the additives, the thermal oxidative aging inhibitors account for 20%-40% of the total amount of the additives, the light aging inhibitors account for 10%-20% of the total amount of the additives, the wetting agents account for 5%-15% of the total amount of the additives, and the leveling agents account for 5%-15% of the total amount of the additives.

5. A method for preparing a long-span steel bridge deck self-repairing polyurethane material, used for preparing the long-span steel bridge deck self-repairing polyurethane material as claimed in claim 1, characterized in that: The steps include: Adding the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction container, and reacting for 2 to 4 hours under stirring and heating conditions until a prepolymer is generated; Adding the chain extender into the reaction vessel containing the prepolymer, reacting for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed; The prepared polyurethane structure is cooled, solidified and surface treated to obtain the long-span steel bridge deck self-repairing polyurethane material.

6. The long-span steel bridge deck self-repairing polyurethane material and preparation method thereof according to claim 5, characterized in that: In the step of "adding the polyisocyanate, the polyether polyol, the polyester polyol and the additive into a reaction container, reacting for 2 to 4 hours under stirring and heating conditions until a prepolymer is generated", the stirring speed is 600 to 1000 rpm and the reaction temperature is 60 to 80°C.

7. The long-span steel bridge deck self-repairing polyurethane material and preparation method thereof according to claim 6, characterized in that: In the step of "adding the chain extender to the reaction container containing the prepolymer, reacting for 1 to 3 hours under stirring and heating conditions until a polyurethane structure is formed", the stirring speed is 300 to 900 rpm and the reaction temperature is 70 to 90°C.

8. The long-span steel bridge deck self-repairing polyurethane material and preparation method thereof according to claim 7, characterized in that: The specific contents of the step of "cooling, curing and surface treating the prepared polyurethane structure to obtain the long-span steel bridge deck self-repairing polyurethane material" include: Cooling: Remove the reaction vessel from the heating device and allow it to cool naturally to room temperature; Curing: Pour the cooled polyurethane material into the mold and cure it; Surface treatment: Surface treatment of the cured polyurethane material; Quality inspection: Conduct quality inspection on the prepared self-healing polyurethane material.

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