Polyurethane composition, polyurethane resin, road repair material and construction method for road repair

Abstract

The present application relates to a polyurethane composition for road repair, a polyurethane resin, a road repair material and a construction method, the polyurethane composition comprising component A and component B, component A comprising a polyurethane prepolymer; the polyurethane prepolymer is prepared from the following components by weight: 100 parts of a first polyol and 100-800 parts of a polyisocyanate; component B comprises: 100 parts of a second polyol, 80-280 parts of water glass, 0.05-0.25 parts of a catalyst, 1-5 parts of a coupling agent, 0.5-2.5 parts of a defoaming agent and 0.5-5 parts of a surfactant; in the polyurethane composition, the mass ratio of component A to component B is 1:(0.5-2.5). The polyurethane composition for road repair of the present application has a fast curing speed, high hardness, high bonding strength, longer service life and durability when the obtained polyurethane resin is used for road repair, and the repaired road surface is not easy to wear.

Description

Technical Field

[0001] This invention relates to the field of road repair technology, and specifically to a polyurethane composition, polyurethane resin, road repair materials, and construction method for road repair. Background Technology

[0002] In recent years, the scale of road engineering in my country has been continuously expanding, and the mileage of highways has been steadily increasing. The market demand for roads has shifted from primarily new construction to primarily maintenance. Ensuring high road surface smoothness is a crucial aspect of road maintenance and a key indicator of the quality of high-grade highway pavements in my country. During actual road operation, uneven settlement and other factors can easily lead to height differences at bridge joints or around manhole covers. When vehicles drive over these differences, significant vibrations and noise are generated, causing noise pollution to nearby residents, affecting driving comfort and safety, and shortening the lifespan of roads and bridges. Therefore, for existing high-grade highways, any unevenness in the road surface requires timely and effective repair.

[0003] Patent CN201910992213.X discloses a pavement elevation difference repair agent comprising emulsified asphalt mixture. This repair agent can be applied at room temperature without the need for special equipment; it can be mixed manually or with a simple mixer. Application is simple, allowing for large-scale application, and traffic can be opened 30-60 minutes after application. Currently available pavement elevation difference repair materials are mostly asphalt-based, which either suffer from low initial stability and long opening times, or have low bonding strength to the base layer and are easily damaged under heavy loads, or are greatly affected by temperature, cracking at low temperatures and softening at high temperatures. Most of these fail to adequately meet the requirements for elevation difference repair.

[0004] In summary, existing pavement elevation difference repair materials, primarily asphalt, result in pavement that is highly susceptible to temperature changes after repair, softening at high temperatures and becoming brittle at low temperatures, leading to a short service life. Developing a reactive pavement elevation difference repair material that cures quickly, provides high repair strength, has a long service life, and is easy to apply is a pressing technical challenge. Summary of the Invention

[0005] The purpose of this invention is to provide a polyurethane composition, polyurethane resin, road repair material, and construction method for road repair. Based on the road repair material and construction method of this invention, road elevation differences can be repaired with fast construction speed, high repair strength, and long service life after repair.

[0006] In a first aspect, the present invention relates to a polyurethane composition for road repair, the polyurethane composition comprising component A and component B, wherein component A comprises: a polyurethane prepolymer; wherein the polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of a first polyol and 100-800 parts of a polyisocyanate; component B comprises the following components in parts by weight: 100 parts of a second polyol, 80-280 parts of water glass, 0.05-0.25 parts of a catalyst, 1-5 parts of a coupling agent, 0.5-2.5 parts of a defoamer, and 0.5-5 parts of a surfactant; wherein, in the polyurethane composition, the mass ratio of component A to component B is 1:(0.5-2.5).

[0007] Optionally, the polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isoflurane diisocyanate, and hexamethylene diisocyanate; the isocyanate group content of the polyurethane prepolymer is 8% to 30%, based on the total weight of the polyurethane prepolymer.

[0008] Optionally, the first polyol and the second polyol are each independently selected from at least one of polyether polyols, polyester polyols and vegetable oil-based polyols.

[0009] Optionally, the first polyol and the second polyol are each independently selected from vegetable oil-based polyols, wherein the hydroxyl value of the vegetable oil-based polyol is 50-400 mg KOH / g and the functionality is 2-4; the vegetable oil-based polyol is selected from at least one of the polyols of soybean oil, safflower oil, linseed oil, corn oil, castor oil, sunflower seed oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil and tung oil.

[0010] Optionally, the first polyol and the second polyol are each independently selected from polyether polyols, wherein the polyether polyol has a hydroxyl value of 28-120 mgKOH / g and a functionality of 2-3; the polyether polyol is selected from at least one of propylene oxide polyether polyol, butylene oxide polyether polyol and polytetrahydrofuran polyether polyol.

[0011] Optionally, the first polyol and the second polyol are each independently selected from polyester polyols, wherein the polyester polyol has a hydroxyl value of 56-130 mgKOH / g and a functionality of 2-3; the polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol and bio-based polyester polyol.

[0012] Optionally, the catalyst is selected from at least one of organometallic catalysts and morpholine catalysts.

[0013] Optionally, the coupling agent is a silane coupling agent, preferably at least one selected from 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3-(2-aminoethyl)aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-diethylenetriaminepropylmethyldimethoxysilane, and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0014] Optionally, the defoamer is a silicone defoamer, preferably at least one of Defom 6500, Defom 5500, DAPROAP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH, and Airex932; the surfactant is a nonionic surfactant, preferably at least one of Glucopon 215UP, Glucopon 225DK, Glucopon 425N / NH, Glucopon 600CSUP, and Glucopon 650EC.

[0015] In a second aspect, the present invention relates to a polyurethane resin for road repair, which is prepared from the polyurethane composition described in the first aspect of the present invention; the method for preparing the polyurethane resin from the polyurethane composition includes: (1) providing or preparing component A; optionally including the step of preparing a polyurethane prepolymer: heating a first polyol to 110 to 115°C at -0.094 to -0.1 MPa for dehydration for 0.5 to 2 h, then cooling to 45 to 55°C and adding a first portion of polyisocyanate, heating to 80 to 85°C, reacting for 2 to 4 h, cooling, adding or not adding a second portion of polyisocyanate, and discharging to obtain the polyurethane prepolymer; (2) providing component B; (3) mixing component A and component B.

[0016] Thirdly, the present invention relates to a road repair material comprising the polyurethane composition for road repair described in the first aspect of the present invention or the polyurethane resin for road repair described in the second aspect of the present invention.

[0017] Fourthly, the present invention relates to a construction method for repairing road elevation differences, the construction method comprising the following steps: (1) cleaning the elevation difference area and filling and leveling the cleaned elevation difference area with aggregate; the aggregate having a particle size of 0.075 to 4.75 mm; (2) pouring the polyurethane resin for road repair described in the second aspect of the present invention onto the surface of the aggregate filling the elevation difference area, and mixing the polyurethane resin with the aggregate to form a mixture; wherein the mass percentage of the polyurethane resin in the mixture is 6% to 18%, preferably 8% to 15%; (3) smoothing the mixture located at the elevation difference area, and before the polyurethane resin is completely cured, spreading fine sand on the surface of the mixture.

[0018] Beneficial effects:

[0019] The polyurethane composition of the present invention for road repair produces a polyurethane resin that cures quickly, has high hardness, high bonding strength, longer service life and durability, and the repaired road surface is not easily worn. Detailed Implementation

[0020] The present application will be further described in detail below through embodiments. Through these descriptions, the features and advantages of the present application will become clearer and more apparent.

[0021] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0023] It should be noted that the number of parts mentioned in this invention can refer to parts by weight, and the NCO content represents the isocyanate group content.

[0024] In a first aspect, the present invention relates to a polyurethane composition for road repair, the polyurethane composition comprising component A and component B, wherein component A comprises: a polyurethane prepolymer; wherein the polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of a first polyol and 100-800 parts of a polyisocyanate; component B comprises the following components in parts by weight: 100 parts of a second polyol, 80-280 parts of water glass, 0.05-0.25 parts of a catalyst, 1-5 parts of a coupling agent, 0.5-2.5 parts of a defoamer, and 0.5-5 parts of a surfactant; wherein, in the polyurethane composition, the mass ratio of component A to component B is 1:(0.5-2.5).

[0025] It should be noted that the polyurethane composition described in the first aspect of this invention is a reactive road repair material. After component A and component B are mixed, the isocyanate component in component A and the active hydrogen component in component B undergo a rapid stepwise addition polymerization reaction under the action of a catalyst and other additives, generating linear and / or three-dimensional molecular structures, ultimately yielding a cured polyurethane resin. Before the polyurethane resin cures, it can bond and / or react with the aggregate particles used in road repair through chemical bonds, hydrogen bonds, van der Waals forces, electrostatic forces, physical interlocking, etc., and simultaneously bond and / or react firmly with the surface of the road surface to be repaired, thus achieving a firmly bonded repair effect after the polyurethane resin cures.

[0026] It should be noted that the polyurethane composition of the present invention uses both polyol and water glass, and is combined with surfactants, which makes the material cure quickly, has high repair strength, and has a longer service life and durability during the road repair process.

[0027] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isoflurane diisocyanate, and hexamethylene diisocyanate; the isocyanate group content of the polyurethane prepolymer is 8% to 30% based on the total weight of the polyurethane prepolymer. Preferably, the isocyanate group content of the polyurethane prepolymer is greater than 12%.

[0028] It should be noted that the polyurethane prepolymer obtained by reacting the polyisocyanate with the first polyol, and together with component B, constitute the polyurethane composition for road repair, can exert a synergistic effect to better repair roads. When the polyisocyanate is selected from modified diphenylmethane diisocyanate, it can specifically be polymethylene polyphenyl polyisocyanate.

[0029] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the first polyol and the second polyol are each independently selected from at least one of polyether polyols, polyester polyols and vegetable oil-based polyols.

[0030] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the first polyol and the second polyol are each independently selected from vegetable oil-based polyols, wherein the vegetable oil-based polyols have a hydroxyl value of 50-400 mgKOH / g and a functionality of 2-4; the vegetable oil-based polyols are selected from at least one of the polyols of soybean oil, safflower oil, linseed oil, corn oil, castor oil, sunflower seed oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil, and tung oil.

[0031] It should be noted that in the polyurethane composition for road repair of the present invention, the second polyol is selected from the vegetable oil-based polyols described above, and water glass is compounded in a certain weight ratio. This significantly improves the curing speed, hardness, and bonding strength during road repair, resulting in better road surface durability and a longer service life. It should also be noted that the modulus of the water glass used in the polyurethane composition for road repair of the present invention can be 2.0 to 3.5.

[0032] According to another specific embodiment of the polyurethane composition of the first aspect of the present invention, the first polyol and the second polyol are each independently selected from polyether polyols, wherein the polyether polyols have a hydroxyl value of 28-120 mgKOH / g and a functionality of 2-3; the polyether polyols are selected from at least one of propylene oxide polyether polyols, butane oxide polyether polyols and polytetrahydrofuran polyether polyols.

[0033] It should be noted that when the first polyol and the second polyol are each independently selected from polyether polyols, the first polyol and / or the second polyol may preferably be polypropylene glycol, i.e., propylene oxide polyether polyol.

[0034] In another specific embodiment of the polyurethane composition according to the first aspect of the present invention, the first polyol and the second polyol are each independently selected from polyester polyols, wherein the polyester polyol has a hydroxyl value of 56 to 130 mg KOH / g and a functionality of 2 to 3; the polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol and bio-based polyester polyol.

[0035] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the catalyst is selected from at least one of organometallic catalysts and morpholine catalysts.

[0036] It should be noted that the catalyst described in this invention accelerates the reaction between the isocyanate component in component A and the active hydrogen component in component B. The organometallic catalyst described in this invention can be an organobismuth catalyst or an organotin catalyst, etc.

[0037] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the coupling agent is a silane coupling agent, preferably at least one selected from 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3-(2-aminoethyl)aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-diethylenetriaminepropylmethyldimethoxysilane, and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0038] It should be noted that, when the polyurethane composition for road repair of the present invention is used for road repair, the inorganic groups in the silane coupling agent can react with the oxides on the surface of the dented road surface or crack to generate stable silicon-oxygen bonds, and the organic groups in the silane coupling agent can react with the isocyanate groups to graft onto the polyurethane molecular chain, thereby increasing the bonding strength between the repair material and the road surface.

[0039] According to a specific embodiment of the polyurethane composition of the first aspect of the present invention, the defoamer is an organosilicone defoamer, preferably at least one selected from Defom 6500, Defom 5500, DAPRO AP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH and Airex932; the surfactant is a nonionic surfactant, preferably at least one selected from Glucopon 215UP, Glucopon 225DK, Glucopon 425N / NH, Glucopon 600CSUP and Glucopon 650EC.

[0040] It should be noted that in the polyurethane composition for road repair of the present invention, during the process of mixing component A and component B to obtain polyurethane resin, bubbles that have no effect and are detrimental to road repair are generated. By adding the aforementioned silicone defoamer, especially one or more of the aforementioned silicone defoamers, the generated bubbles can be effectively eliminated, which is beneficial for the repaired road surface to obtain greater strength, so that the repaired road surface has better durability and service life.

[0041] It should be noted that, as a preferred embodiment, in the polyurethane composition for road repair of the present invention, the second polyol is selected from the aforementioned vegetable oil-based polyol, and water glass is compounded according to the aforementioned weight proportions, while the aforementioned nonionic surfactant is also compounded. This results in a more stable polyurethane composition for storage. During road repair, after component A and component B are mixed, in the presence of the aforementioned nonionic surfactant, the surface tension of different components such as the polyurethane prepolymer in component A, the second polyol in component B, and water glass is reduced, allowing for faster and more uniform mixing between the components. This promotes the rapid reaction between the isocyanate component and the active hydrogen component, which is beneficial for faster curing of the polyurethane resin and improves the bonding strength and service life of the cured polyurethane resin.

[0042] In a second aspect, the present invention relates to a polyurethane resin for road repair, which is prepared from the polyurethane composition described in the first aspect of the present invention; the method for preparing the polyurethane resin from the polyurethane composition includes: (1) providing or preparing component A; optionally including the step of preparing a polyurethane prepolymer: heating a first polyol to 110 to 115°C at -0.094 to -0.1 MPa for dehydration for 0.5 to 2 h, then cooling to 45 to 55°C and adding a first portion of polyisocyanate, heating to 80 to 85°C, reacting for 2 to 4 h, cooling, adding or not adding a second portion of polyisocyanate, and discharging to obtain the polyurethane prepolymer; (2) providing component B; (3) mixing component A and component B.

[0043] It should be noted that, in the first embodiment, in step (1), the temperature is raised to 80-85°C, and after reacting for 2-4 hours, the temperature is lowered, and the polyurethane prepolymer is discharged. In this embodiment, the polyisocyanate is added all at once.

[0044] In the second embodiment, in step (1), the temperature is raised to 80-85°C, reacted for 2-4 hours, then cooled to 45-55°C, and the second part of polyisocyanate is added and mixed evenly. The polyurethane prepolymer is then discharged. In this embodiment, the polyisocyanate is added in two parts. The first part of the polyisocyanate is added after the first polyol is dehydrated and cooled, then the temperature is raised for a certain time, and after cooling to 45-55°C, the second part of the polyisocyanate is added. In this embodiment, the second part of the polyisocyanate is not subjected to a heating reaction. This additional polyisocyanate can avoid adverse phenomena such as self-polymerization of polyisocyanate at high temperatures, can adjust the NCO content of the obtained polyurethane prepolymer to be within the target content range, and has a certain regulatory effect on the performance of the final product.

[0045] It should be noted that, in the second embodiment, the sum of the weights of the first polyisocyanate portion and the second polyisocyanate portion is the total weight. The proportion of the first polyisocyanate portion in the total weight can be 20-50%, and the proportion of the second polyisocyanate portion in the total weight can be 50-80%. Specifically, the weight ratio of the first polyisocyanate portion and the second polyisocyanate portion can be 1:3. The first polyisocyanate portion and the second polyisocyanate portion can be the same polyisocyanate, or they can be selected from different polyisocyanates.

[0046] Thirdly, the present invention relates to a road repair material comprising the polyurethane composition for road repair described in the first aspect of the present invention or the polyurethane resin for road repair described in the second aspect of the present invention.

[0047] Fourthly, the present invention relates to a construction method for repairing road elevation differences, the construction method comprising the following steps: (1) cleaning the elevation difference area and filling and leveling the cleaned elevation difference area with aggregate; the aggregate having a particle size of 0.075 to 4.75 mm; (2) pouring the polyurethane resin for road repair described in the second aspect of the present invention onto the surface of the aggregate filling the elevation difference area, and mixing the polyurethane resin with the aggregate to form a mixture; wherein the mass percentage of the polyurethane resin in the mixture is 6% to 18%, preferably 8% to 15%; (3) smoothing the mixture located at the elevation difference area, and before the polyurethane resin is completely cured, spreading fine sand on the surface of the mixture.

[0048] It should be noted that the construction method for road elevation difference repair of the present invention is simple and easy to carry out. In step (1), the aggregate can be crushed stone, etc. According to the size of the elevation difference, such as 2-5cm, an appropriate amount of aggregate is selected for filling; in step (2), the A component and B component described in the first aspect of the present invention can also be mixed to obtain polyurethane resin, and then poured; in step (2), the polyurethane resin and the aggregate are mixed evenly to form a mixture; in step (3), the surface can be smoothed with a trowel, and before the resin is completely cured, fine sand is spread. After waiting for 10-15 minutes, traffic can be opened.

[0049] The road repair material or road elevation difference repair method of the present invention can form a repair surface with good strength in 10 minutes at room temperature and can be opened to traffic within 30 minutes; no primer is required, and it can form high bonding strength with a variety of substrates such as asphalt concrete and steel plates; the road repair material does not soften at high temperature and does not crack at low temperature.

[0050] The present invention will be further described in detail below through examples, but these examples are not intended to limit the invention.

[0051] Unless otherwise specified, all reagents used in the following examples are commercially available finished reagents.

[0052] The following is a description of the manufacturers and brands of reagents used in the examples or comparative examples:

[0053] 1. Polyols:

[0054] Castor oil polyol, product brand XP D1000, functionality 2, hydroxyl value 122mgKOH / g, van truss;

[0055] Polypropylene glycol, product brand PPG1000, functionality 2, hydroxyl value 112mgKOH / g, Shandong Lanxing Dongda Co., Ltd.

[0056] Vegetable oil-based polyol, product brand Sovermol 819, functionality 2.6, hydroxyl value 240 mg KOH / g, BASF;

[0057] 2. Polyisocyanates:

[0058] Diphenylmethane diisocyanate, product brand MDI-50, Wanhua Chemical Group Co., Ltd.

[0059] Polymethylene polyphenyl polyisocyanate (modified diphenylmethane diisocyanate), product brand PM200, Wanhua Chemical Group Co., Ltd.

[0060] Liquefied diphenylmethane diisocyanate (modified diphenylmethane diisocyanate), product brand MDI100L, Wanhua Chemical Group Co., Ltd.

[0061] 3. Water glass, modulus 3.1, Tianjin Zhonghe Shengteng Chemical Co., Ltd.;

[0062] 4. Catalyst: Organometallic catalyst for polyurethane resin, product brand AUCAT-100E, Guangzhou Yourun Synthetic Materials Co., Ltd.

[0063] 5. Coupling agent: 3-(2,3-epoxypropoxy)propyltrimethoxysilane, product brand A-187, Momentive, USA;

[0064] 6. Defoamer: Product brand BYK-065, BYK Chemical;

[0065] 7. Surfactant: Product brand name Glucopon 215UP, BASF.

[0066] The component amounts in the following examples are all expressed in parts by weight.

[0067] Example 1

[0068] (1) Preparation of component A:

[0069] 100 parts of castor oil polyol (XP D1000) were heated to 110℃ and dehydrated under vacuum (-0.096MPa) for 1 hour. Then, the temperature was lowered to 50℃ and 100 parts of diphenylmethane diisocyanate (MDI-50) were added. The temperature was gradually raised to 80-85℃ and reacted for 3 hours. After that, the temperature was lowered to 50℃ and 300 parts of polymethylene polyphenyl polyisocyanate (PM200) were added. The mixture was mixed evenly and discharged to obtain a polyurethane prepolymer with an isocyanate group (NCO) content of 25.1%.

[0070] (2) Preparation of component B:

[0071] Mix 100 parts of castor oil polyol (XP D1000) with 100 parts of water glass (modulus 3.1) until homogeneous, then add 0.18 parts of polyurethane resin organometallic catalyst (AUCAT-100E), 1.5 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (A-187) as a coupling agent, 1.5 parts of defoamer (BYK-065), and 2.5 parts of nonionic surfactant (Glucopon215UP), and stir until homogeneous to obtain component B.

[0072] (3) Mix the above-prepared component A and component B at a mass ratio of 1:1 to obtain a polyurethane resin for road repair.

[0073] Example 2

[0074] (1) Preparation of component A:

[0075] 100 parts of castor oil polyol (XP D1000) were heated to 110℃ and dehydrated under vacuum (-0.096MPa) for 1 hour. Then, the temperature was lowered to 50℃ and 150 parts of diphenylmethane diisocyanate (MDI-50) were added. The temperature was gradually raised to 80-85℃ and reacted for 3 hours. After cooling, the product was discharged to obtain a polyurethane prepolymer with an isocyanate group (NCO) content of 16.8%.

[0076] (2) Preparation of component B:

[0077] 100 parts of vegetable oil-based polyol (Sovermol 819) and 90 parts of water glass (modulus 3.1) were mixed evenly. Then, 0.25 parts of polyurethane resin organometallic catalyst (AUCAT-100E), 1.5 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (A-187) as a coupling agent, 2.0 parts of defoamer (BYK-065) and 2.5 parts of nonionic surfactant (Glucopon 215UP) were added and stirred evenly to obtain component B.

[0078] (3) Mix the above-prepared component A and component B at a mass ratio of 1:1 to obtain a polyurethane resin for road repair.

[0079] Example 3

[0080] (1) Preparation of component A:

[0081] Same as in Implementation 1.

[0082] (2) Preparation of component B:

[0083] 100 parts of vegetable oil-based polyol (Sovermol 819) and 100 parts of water glass (modulus 3.1) were mixed evenly. Then, 0.15 parts of polyurethane resin organometallic catalyst (AUCAT-100E), 1.5 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (A-187) as a coupling agent, 1.5 parts of defoamer (BYK-065) and 2.5 parts of nonionic surfactant (Glucopon 215UP) were added and stirred evenly to obtain component B.

[0084] (3) Same as Example 1.

[0085] Example 4

[0086] The polyurethane resin for road repair was prepared according to the method of Example 1, except that:

[0087] In Example 1, castor oil polyol (XP D1000) in component A was replaced with an equal weight of polypropylene glycol (PPG1000), and castor oil polyol (XP D1000) in component B was replaced with an equal weight of vegetable oil-based polyol (Sovermol 819).

[0088] Example 5

[0089] (1) Preparation of component A:

[0090] 100 parts of polypropylene glycol (PPG1000) were heated to 110°C and dehydrated under vacuum (-0.096 MPa) for 1 hour. Then, the temperature was lowered to 50°C and 250 parts of liquefied diphenylmethane diisocyanate (MDI 100L) were added. The temperature was gradually raised to 80-85°C and reacted for 3 hours. After that, the temperature was lowered to 50°C and 500 parts of polymethylene polyphenyl polyisocyanate (PM200) were added. The mixture was mixed evenly and discharged to obtain a polyurethane prepolymer with an isocyanate group (NCO) content of 27.4%.

[0091] (2) Preparation of component B:

[0092] 100 parts of vegetable oil-based polyol (Sovermol 819) and 200 parts of water glass (modulus 3.1) were mixed evenly. Then, 0.15 parts of polyurethane resin organometallic catalyst (AUCAT-100E), 3.5 parts of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (A-187) as a coupling agent, 2.0 parts of defoamer (BYK-065) and 3.5 parts of nonionic surfactant (Glucopon 215UP) were added and stirred evenly to obtain component B.

[0093] (3) Mix the above-prepared component A and component B at a mass ratio of 1:2 to obtain a polyurethane resin for road repair.

[0094] Comparative Example 1

[0095] The polyurethane resin for road repair was prepared according to the method of Example 1, except that:

[0096] Castor oil polyol XP D1000 was not added during the preparation of component B.

[0097] Comparative Example 2

[0098] The polyurethane resin for road repair was prepared according to the method of Example 2, except that:

[0099] No water glass was added during the preparation of component B.

[0100] Comparative Example 3

[0101] The polyurethane resin for road repair was prepared according to the method of Example 2, except that:

[0102] The amount of water glass added during the preparation of component B is 50 parts.

[0103] Test Example 1

[0104] The curing time, hardness, bond strength, tensile strength and elongation at break of the polyurethane resins prepared for road repair in the above examples and comparative examples were tested, and the results are shown in Table 1.

[0105] The performance testing methods involved are as follows:

[0106] 1. Curing time

[0107] The curing time shall be tested in accordance with the provisions of section 16 of GB / T16777.

[0108] 2. Bond strength

[0109] The bond strength was tested according to the provisions of section 7 of GB / T 16777. The resin was applied to the surface of the asphalt concrete sample block with a thickness of 0.2-0.5 mm.

[0110] 3. Tensile strength and elongation at break

[0111] Tensile strength and elongation at break shall be tested in accordance with the provisions of GB / T 528-2009;

[0112] 4. Hardness

[0113] Hardness was tested in accordance with the provisions of GB / T 6031-2017.

[0114] Table 1. Performance test results of polyurethane resin

[0115]

[0116] The data in Table 1 show that the polyurethane resin in the examples exhibits excellent overall performance in terms of curing time, hardness, bond strength, and tensile strength. The polyurethane resins in the comparative examples either have excessively long curing times, excessively low elongation at break leading to easy breakage, or low bond strength, resulting in inferior overall performance compared to the examples. In Comparative Example 3, the amount of water glass in component B was too low, leading to severe foaming of the material after mixing components A and B, resulting in polyurethane resin with low bond strength and easy breakage.

[0117] Test Example 2

[0118] The polyurethane resins prepared in the above-described embodiments and comparative examples were used to repair areas with elevation differences in roads. Expansion joints at bridge abutments in asphalt pavements (areas with similar depths and shapes of depressions at different locations) were filled using the materials prepared in the above-described embodiments and comparative examples. The polyurethane resin content was 10% (the percentage of polyurethane resin in the total mass of polyurethane resin and aggregate), and the aggregate was basalt gravel with a particle size of 0.075–4.75 mm. Specifically, the expansion joints at the bridge abutments were first cleaned, and the basalt gravel was used to fill and level the expansion joints. The polyurethane resins prepared in the above-described embodiments and comparative examples were then uniformly poured onto the surface of the basalt gravel filled at different locations, and the polyurethane resin and gravel were mixed evenly and smoothed. Before the polyurethane resin was completely cured, fine sand was spread on the surface. The development time for traffic was evaluated, and the pavement texture depth, friction coefficient, and permeability coefficient were tested. The condition was observed after 30 days of operation, and the results are shown in Table 2.

[0119] The testing methods involved are as follows:

[0120] The opening time is calculated from the start of mixing components A and B until the polyurethane resin has fully dried.

[0121] The construction depth was tested in accordance with T0961-1995 of the "Specifications for Field Testing of Highway Subgrade and Pavement" (JTG 3450-2019).

[0122] The friction coefficient was tested in accordance with T0964-2008 of the "Specifications for Field Testing of Highway Subgrade and Pavement" (JTG 3450-2019).

[0123] The permeability coefficient was tested in accordance with T0971-2019 of the "Specifications for Field Testing of Highway Subgrade and Pavement" (JTG 3450-2019).

[0124] Table 2. Results of polyurethane resin repair of asphalt pavement elevation differences.

[0125]

[0126]

[0127] The data in Table 2 show that the polyurethane resin prepared in the examples exhibits excellent overall performance in repairing asphalt pavements. The repaired pavement shows less wear and a longer service life within the same timeframe. The polyurethane resin remains stable at temperatures ranging from -30℃ to 70℃, thus demonstrating better high and low temperature stability compared to asphalt-based repair materials. Furthermore, the road repair material of this invention can be mixed using equipment or manually, making it convenient to operate. It also exhibits strong adhesion to the substrate and possesses toughness.

[0128] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this application. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0129] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0130] The present application has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present application based on these embodiments, all of which fall within the protection scope of the present application.

Claims

1. A polyurethane composition for road repair, characterized in that, The polyurethane composition comprises component A and component B, wherein, Component A contains: Polyurethane prepolymer; The polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of the first polyol, and 100-800 parts of polyisocyanate; Component B comprises the following components in parts by weight: 100 parts of the second polyol, 80-280 parts of water glass Catalyst 0.05~0.25 parts, 1-5 parts of coupling agent, 0.5-2.5 parts of defoamer, and Surfactant 0.5-5 parts; In the polyurethane composition, the mass ratio of component A to component B is 1:(0.5~2.5). Wherein, the first polyol is selected from at least one of polyether polyol, polyester polyol and vegetable oil-based polyol, and the second polyol is selected from vegetable oil-based polyol; The hydroxyl value of the plant oil-based polyol is 50~400 mgKOH / g, and the functionality is 2~4; The polyether polyol has a hydroxyl value of 28~120 mgKOH / g and a functionality of 2~3; The hydroxyl value of the polyester polyol is 56~130 mgKOH / g, and the functionality is 2~3.

2. The polyurethane composition according to claim 1, characterized in that, The polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isoflurone diisocyanate and hexamethylene diisocyanate; The isocyanate group content of the polyurethane prepolymer is 8% to 30%, based on the total weight of the polyurethane prepolymer.

3. The polyurethane composition according to claim 1, characterized in that, The plant oil-based polyol is selected from at least one polyol selected from soybean oil, safflower oil, flaxseed oil, corn oil, castor oil, sunflower seed oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil, and tung oil.

4. The polyurethane composition according to claim 1, characterized in that, The polyether polyol is selected from at least one of propylene oxide polyether polyol, butane oxide polyether polyol, and polytetrahydrofuran polyether polyol.

5. The polyurethane composition according to claim 1, characterized in that, The polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol, and bio-based polyester polyol.

6. The polyurethane composition according to claim 1, wherein, The catalyst is selected from at least one of organometallic catalysts and morpholine catalysts.

7. The polyurethane composition according to claim 1, wherein, The coupling agent is a silane coupling agent.

8. The polyurethane composition according to claim 7, wherein, The coupling agent is selected from at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3-(2-aminoethyl)aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-diethylenetriaminepropylmethyldimethoxysilane, and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

9. The polyurethane composition according to claim 1, wherein, The defoamer is an organosilicone defoamer; The surfactant is a nonionic surfactant.

10. The polyurethane composition according to claim 9, wherein, The defoamer is selected from at least one of Defom 6500, Defom 5500, DAPRO AP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH and Airex932.

11. The polyurethane composition according to claim 9, wherein, The surfactant is selected from at least one of Glucopon 215UP, Glucopon 225 DK, Glucopon 425 N / NH, Glucopon 600 CSUP, and Glucopon 650 EC.

12. A polyurethane resin for road repair, prepared from the polyurethane composition according to any one of claims 1 to 11; the method for preparing the polyurethane resin from the polyurethane composition comprises: (1) Providing or preparing component A; optionally including the step of preparing a polyurethane prepolymer: The first polyol is heated to 110-115℃ at -0.094~-0.1 MPa for dehydration for 0.5~2h, then cooled to 45~55℃ and the first part of polyisocyanate is added. The temperature is raised to 80~85℃ and reacted for 2~4h. The temperature is then lowered, and the second part of polyisocyanate is added or not added. The product is discharged to obtain the polyurethane prepolymer. (2) Provide component B; (3) Mix component A and component B.

13. A road repair material comprising the polyurethane composition for road repair as described in any one of claims 1 to 11 or the polyurethane resin for road repair as described in claim 12.

14. A construction method for repairing road elevation differences, characterized in that, The construction method includes the following steps: (1) Clean up the elevation difference area and fill and level the cleaned elevation difference area with aggregate; the aggregate has a particle size of 0.075~4.75 mm; (2) The polyurethane resin for road repair as described in claim 12 is poured onto the surface of the aggregate that is filled in the elevation difference area, and the polyurethane resin is mixed with the aggregate to form a mixture; wherein the mass percentage of the polyurethane resin in the mixture is 6% to 18%; (3) Smooth the mixture located at the height difference, and before the polyurethane resin is completely cured, spread fine sand on the surface of the mixture.

15. The construction method for road elevation difference repair according to claim 14, wherein, The polyurethane resin accounts for 8% to 15% of the mass of the mixture.

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