Polyurethane grouting material and application thereof

Abstract

The invention belongs to the technical field of polyurethane foam, and particularly relates to a polyurethane grouting material and application thereof. The polyurethane grouting material provided by the invention comprises a component A and a component B which are independently subpackaged, the component A comprises the following components in parts by mass: 100 parts of polyether polyol, 1-5 parts of an organic silicon surfactant, 1-10.0 parts of a catalyst and 0.2-2.5 parts of a foaming agent; and the component B is isocyanate. Data of the embodiment show that the polyurethane grouting material provided by the invention has the advantages of excellent flowability and rapid curing, and the prepared foam has good mechanical properties and stability. Meanwhile, the polyurethane grouting material meets the requirements of the Monte Protocol for protecting the ozone layer and the Beijing Protocol for reducing the emission of greenhouse gases.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane foam, and particularly relates to a polyurethane grouting material and application thereof. Background Art

[0002] With the rapid development of transportation construction, the mileage of roads open to traffic has increased rapidly. In sections of roads with heavy traffic, road pavement is prone to multiple problems, such as cracking, settlement, voids, and a loose roadbed. These problems affect the quality of road operations, with settlement and voids, in particular, posing serious safety risks.

[0003] When old pavement suffers from common problems like subsidence and voids, the traditional repair method is excavation. This involves completely removing the surface and base layers, performing necessary roadbed treatments and repairs, and then rebuilding the entire pavement structure. This traditional excavation repair method presents a number of problems. First, the root cause of the problem may not be completely eliminated, thus affecting the quality and service life of the repaired pavement. Second, the work involved is extensive and the maintenance costs are high. Third, the repair process is lengthy, significantly impacting traffic.

[0004] The Ministry of Housing and Urban-Rural Development issued the industry standard HG / T 4574-2014, "Technical Specification for Trenchless Treatment of Deep Road Defects," which came into effect on June 1, 2017. This technology, which primarily uses drilling, grouting, and backfilling, precisely treats deep road defects. It effectively addresses these problems, enhances road load-bearing capacity, and extends road service life, significantly improving maintenance efficiency and effectiveness. Trenchless treatment technology also offers environmental and energy advantages. It reduces excavation and backfilling processes, thereby minimizing damage to soil and water resources, while also reducing waste generation and disposal costs. This technology not only aligns with the concept of sustainable development but also helps mitigate the environmental impact of road repair projects.

[0005] At present, non-excavation polyurethane grouting materials for roads are still in the early stages of research, and there is no grouting material that can be used to repair deep-seated diseases such as road collapse and voids. Summary of the Invention

[0006] The purpose of the present invention is to provide a polyurethane grouting material and its application. The polyurethane grouting material provided by the present invention has the advantages of excellent fluidity and rapid curing, and can be used to repair deep-seated diseases such as road collapse and cavities. At the same time, the polyurethane grouting material complies with the requirements of regulations such as the Montreal Protocol on protecting the ozone layer and the Kyoto Protocol on reducing greenhouse gas emissions.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a polyurethane grouting material, comprising independently packaged component A and component B;

[0009] Calculated by mass, the component A includes 100 parts of polyether polyol, 1 to 5 parts of organosilicon surfactant, 1 to 10.0 parts of catalyst, and 0.2 to 2.5 parts of foaming agent;

[0010] The component B is isocyanate.

[0011] Preferably, the polyether polyol includes polyether polyol a and polyether polyol b; the polyether polyol a has a hydroxyl value of 300-500 mgKOH / g and a viscosity of 1500-20000 mPa.s; the polyether polyol b has a hydroxyl value of 100-350 mgKOH / g and a viscosity of 100-500 mPa.s.

[0012] Preferably, the mass ratio of the polyether polyol a to the polyether polyol b is 50-70:50-30.

[0013] Preferably, the catalyst includes a foaming catalyst, a gel catalyst and a trimerization catalyst; the mass ratio of the foaming catalyst, the gel catalyst and the trimerization catalyst is 1:2:1.

[0014] Preferably, the foaming catalyst includes one or more of trimethylhydroxyethylethylenediamine, pentamethyldiethylenetriamine, dimorpholine diethyl ether and bis(dimethylaminoethyl) ether; the gel-type catalyst includes N,N-dimethylcyclohexylamine and / or triethylenediamine; and the trimerization catalyst includes one or more of 1,3,5-tris(dimethylaminopropyl)hexahydrotriazine, quaternary ammonium salts, soluble potassium salts and soluble sodium salts.

[0015] Preferably, the foaming agent is water.

[0016] Preferably, the isocyanate is polyphenylpolymethylene polyisocyanate.

[0017] Preferably, the volume ratio of component A to component B is 100:100-120.

[0018] The present invention also provides the use of the polyurethane grouting material described in the above technical solution in road repair.

[0019] The present invention also provides a method for repairing a road, comprising the following steps:

[0020] 1) Determine the location and depth of road damage;

[0021] 2) Arrange and drill holes at the road damage locations, then perform grouting, hole sealing and maintenance;

[0022] The grouting slurry is the polyurethane grouting material described in the above technical solution.

[0023] Data from the examples demonstrate that the polyurethane grouting material provided by the present invention exhibits excellent fluidity and rapid curing, making it suitable for repairing deep-seated road damage such as road collapses and cavities. Furthermore, the foam produced from this polyurethane grouting material exhibits excellent mechanical properties and stability. Furthermore, the polyurethane grouting material complies with the requirements of the Montreal Protocol on ozone layer protection and the Kyoto Protocol on greenhouse gas emissions reduction. DETAILED DESCRIPTION

[0024] The invention provides a polyurethane grouting material, comprising a component A and a component B which are separately packaged.

[0025] Calculated by mass, the component A includes 100 parts of polyether polyol, 1 to 5 parts of organosilicon surfactant, 1 to 10.0 parts of catalyst, and 0.2 to 2.5 parts of foaming agent;

[0026] The component B is isocyanate.

[0027] As an embodiment of the present invention, the component A includes 100 parts of polyether polyol in parts by mass; the polyether polyol includes polyether polyol a and polyether polyol b; the mass ratio of polyether polyol a to polyether polyol b is preferably 50-70:50-30, specifically 60:40, 70:30 or 50:50.

[0028] As an embodiment of the present invention, the polyether polyol a preferably has a hydroxyl value of 300 to 500 mgKOH / g and a viscosity of 1500 to 20000 mPa.s. In the embodiment of the present invention, the polyether polyol a is specifically described using PN-400 purchased from Jiahua Chemical Co., Ltd. as an example.

[0029] In one embodiment of the present invention, the polyether polyol a is preferably obtained by ring-opening polymerization of a first initiator and an alkylene oxide. In one embodiment of the present invention, the first initiator preferably comprises a polyhydroxy compound and an amine compound; the polyhydroxy compound preferably comprises one or more of glycerol, triethanolamine, pentaerythritol, sorbitol, and sucrose; and the amine compound preferably comprises ethylenediamine and / or toluenediamine. In one embodiment of the present invention, the alkylene oxide preferably comprises propylene oxide and / or ethylene oxide.

[0030] As an embodiment of the present invention, the polyether polyol b preferably has a hydroxyl value of 100 to 350 mgKOH / g, a viscosity of 100 to 500 mPa.s, and a functionality of 2 to 3. In the present embodiment, the polyether polyol b is specifically described using JH310 purchased from Jiahua Chemical Co., Ltd. as an example.

[0031] As one embodiment of the present invention, the polyether polyol b is preferably obtained by ring-opening polymerization of a second initiator and an alkylene oxide; the second initiator preferably comprises a polyhydroxy compound and a polymethylol alkane compound; the polyhydroxy compound preferably comprises one or more of ethylene glycol, propylene glycol, diethylene glycol, glycerol, and triethanolamine; and the polymethylol alkane compound preferably comprises trimethylolpropane. As one embodiment of the present invention, the alkylene oxide preferably comprises propylene oxide and / or ethylene oxide.

[0032] As an embodiment of the present invention, the component A includes 1 to 5 parts of an organosilicon surfactant, specifically 3 parts, in parts by mass; the organosilicon surfactant is preferably the S series product of Shanghai Maihao Chemical Technology Co., Ltd., the B series product of Evonik Group, the L series product of Maitu High-tech Materials and the AK series product of Jiangsu Meside Chemical Co., Ltd. In the embodiments of the present invention, S-8900 purchased from Shanghai Maihao Chemical Technology Co., Ltd. is specifically used as an example for illustration.

[0033] As an embodiment of the present invention, the component A includes 1 to 10.0 parts of catalyst, specifically 3.5 parts, 4 parts, 5 parts or 6.5 parts, in parts by mass; the catalyst preferably includes a foaming catalyst, a gel-type catalyst and a trimerization catalyst; the mass ratio of the foaming catalyst, the gel-type catalyst and the trimerization catalyst is preferably 1:2:1.

[0034] As an embodiment of the present invention, the foaming catalyst preferably includes one or more of trimethylhydroxyethylethylenediamine, pentamethyldiethylenetriamine, dimorpholine diethyl ether and bis(dimethylaminoethyl) ether; the gel-type catalyst preferably includes N,N-dimethylcyclohexylamine and / or triethylenediamine; the trimerization catalyst preferably includes one or more of 1,3,5-tris(dimethylaminopropyl)hexahydrotriazine, a quaternary ammonium salt, a soluble potassium salt and a soluble sodium salt. In the embodiments of the present invention, trimethylhydroxyethylethylenediamine (DabcoT), triethylenediamine (A33) and potassium isooctanoate (K-15) purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd. are specifically used as examples for illustration.

[0035] As an embodiment of the present invention, the component A includes 0.2 to 2.5 parts of a foaming agent, specifically 1 part or 2 parts, in parts by mass; the foaming agent is preferably water.

[0036] In the present invention, water can react with isocyanate to generate carbon dioxide (CO2), which has the advantages of an ODP value of zero and a GWP value of 1.

[0037] The present invention also provides that component A is preferably obtained by mixing a polyether polyol, an organosilicon surfactant, and a catalyst foaming agent and then defoaming;

[0038] As an embodiment of the present invention, the mixing is preferably carried out under stirring conditions, the stirring speed is preferably 400-500 rpm, and the mixing time is preferably 0.5-1 hour; the defoaming is preferably static defoaming, and the static defoaming time is preferably 0.5-1 hour.

[0039] As one embodiment of the present invention, component B is an isocyanate; the isocyanate can specifically be polyphenyl polymethylene polyisocyanate; as one embodiment of the present invention, the viscosity of the polyphenyl polymethylene polyisocyanate is preferably 150-700 mPa.s; the NCO content is preferably 30-32%; and the functionality is preferably 2.6-3.0. Specifically, the polyphenyl polymethylene polyisocyanate is a commercially available product, such as PM200, PM400, PM700 from Wanhua Chemical Group Co., Ltd., M20S and M70L from BASF, 5005 and 5888 from Huntsman, 44V20, 44V40 and 44V70 from Covestro, or M200 and SR500 from Kumho, South Korea. In the embodiments of the present invention, PM200 purchased from Wanhua Chemical Group Co., Ltd. is used as an example for illustration.

[0040] As an embodiment of the present invention, the volume ratio of component A to component B is preferably 100:100-120, specifically 100:110.

[0041] The present invention also provides a method for preparing polyurethane foam, comprising the following steps:

[0042] Component A and component B are mixed and then cast. After the components A and B react, they expand and solidify to form the polyurethane foam.

[0043] The present invention also provides the use of the polyurethane grouting material described in the above technical solution in road repair.

[0044] The present invention also provides a method for repairing a road, comprising the following steps:

[0045] 1) Determine the location and depth of road damage;

[0046] 2) Arrange and drill holes at the road damage locations, then perform grouting, hole sealing and maintenance;

[0047] The grouting slurry is the polyurethane grouting material described in the above technical solution.

[0048] As an embodiment of the present invention, the grouting is carried out using professional polyurethane grouting equipment with an output stress greater than 1000psi to ensure that component A and component B of the polyurethane grouting material are fully mixed and the mixture is grouted to the defect location.

[0049] In order to further illustrate the present invention, the scheme of the present invention is described in detail below with reference to the embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0050] The sources of the raw materials used in the following examples are as follows:

[0051] Polyether polyol a: PN-400, hydroxyl value 400 mgKOH / g, viscosity 2000 mPa·s, functionality 4.0, purchased from Jiahua Chemical Co., Ltd.

[0052] Polyether polyol b: JH310, hydroxyl value 160 mgKOH / g, viscosity 250 mPa·s, functionality 3.0, purchased from Jiahua Chemical Co., Ltd.

[0053] Silicone surfactant: S-8900, purchased from Shanghai Maihao Chemical Technology Co., Ltd.

[0054] Catalysts trimethylhydroxyethylethylenediamine (Dabco T), triethylenediamine (A33), and potassium isooctanoate (K-15) were purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd.

[0055] Polyphenyl polymethylene polyisocyanate: PM200, NCO content of 31.5%, viscosity of 200-250 mPa·s, purchased from Wanhua Chemical Group Co., Ltd.

[0056] Examples 1 to 6

[0057] The formulations of Examples 1 to 6 are shown in Table 1:

[0058] Table 1 Examples 1 to 6 (unit / mass parts)

[0059]

[0060]

[0061] Preparation method: According to the ratio in Table 1, polyether polyol, silicone surfactant and catalyst foaming agent are mixed (mixed at a speed of 500 rpm for 1 hour) and then allowed to stand and defoam for 30 minutes to obtain the obtained product.

[0062] The specific gravity, viscosity, and other physical properties of component A were tested according to CJJ / T 260-2016. The test results are shown in Table 2. The reactivity characteristics of components A and B were also tested according to HG / T 4574-2014. The test results are shown in Table 3.

[0063] Table 2 Physical properties of components A and B in Examples 1 to 6

[0064]

[0065] Table 3 Reaction characteristic indexes of components A and B in Examples 1 to 6

[0066] project unit S1 S2 S3 S4 S5 S6 Start time s 8 8 8 14 5 10 Gel time s 40 38 42 58 32 50 Free rise time s 45 42 47 65 35 55 Free foam density <![CDATA[kg / m 3 ]]> 52 51 52 53 51 105 Expansion ratio / 22.1 22.5 22.1 21.7 22.5 11.0

[0067] As can be seen from Table 2, the viscosity index of component A can be adjusted by changing the ratio of polyether polyol a and polyether polyol b. As can be seen from Table 3, the reaction characteristics after mixing components A and B can be adjusted by changing the amount of catalyst added, and the expansion ratio of the mixture of components A and B can be adjusted by changing the amount of foaming agent water added.

[0068] Components A and B were thoroughly mixed in a polyurethane pouring machine and poured into a mold to produce polyurethane foam, a polyurethane grouting material. After aging the foam at room temperature for 48 hours, various properties were tested according to HG / T4574-2014. The test results are shown in Table 4.

[0069] Table 4 Performance test results of polyurethane foam obtained in Examples 1 to 6

[0070]

[0071]

[0072] Tables 3 and 4 show that the expansion pressure of the polyurethane grouting material provided by the present invention is directly related to its free cell density and apparent density. In Example 1, the expansion pressure increases with increasing apparent density, forming a generally linear relationship. Comparing Example 1 with Example 6, at the same apparent density, the expansion pressure decreases with increasing free cell density. The polyurethane foams produced from the polyurethane grouting materials of Examples 1-6 exhibit excellent mechanical properties, with strength increasing with increasing apparent density. Furthermore, the polyurethane foams exhibit low water absorption and excellent high and low temperature stability. All performance characteristics meet the technical requirements of HG / T4574-2014, "Technical Specification for Trenchless Treatment of Deep Road Defects."

[0073] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A polyurethane grouting material, characterized in that: Comprising independently packaged component A and component B; Calculated by mass, the component A includes 100 parts of polyether polyol, 1 to 5 parts of organosilicon surfactant, 1 to 10.0 parts of catalyst, and 0.2 to 2.5 parts of foaming agent; The component B is isocyanate.

2. The polyurethane grouting material according to claim 1, wherein The polyether polyol includes polyether polyol a and polyether polyol b; the polyether polyol a has a hydroxyl value of 300-500 mgKOH / g and a viscosity of 1500-20000 mPa.s; the polyether polyol b has a hydroxyl value of 100-350 mgKOH / g and a viscosity of 100-500 mPa.s.

3. The polyurethane grouting material according to claim 1 or 2, wherein: The mass ratio of the polyether polyol a to the polyether polyol b is 50-70:50-30.

4. The polyurethane grouting material according to claim 1, wherein The catalyst comprises a foaming catalyst, a gel catalyst and a trimerization catalyst; the mass ratio of the foaming catalyst, the gel catalyst and the trimerization catalyst is 1:2:

1.

5. The polyurethane grouting material according to claim 4, wherein The foaming catalyst includes one or more of trimethylhydroxyethylethylenediamine, pentamethyldiethylenetriamine, dimorpholine diethyl ether and bis(dimethylaminoethyl) ether; the gel-type catalyst includes N,N-dimethylcyclohexylamine and / or triethylenediamine; and the trimerization catalyst includes one or more of 1,3,5-tris(dimethylaminopropyl)hexahydrotriazine, quaternary ammonium salt, soluble potassium salt and soluble sodium salt.

6. The polyurethane grouting material according to claim 1, wherein The foaming agent is water.

7. The polyurethane grouting material according to claim 1, wherein The isocyanate is polyphenyl polymethylene polyisocyanate.

8. The polyurethane grouting material according to claim 1, wherein The volume ratio of component A to component B is 100:100-120.

9. Use of the polyurethane grouting material according to any one of claims 1 to 8 in road repair.

10. A method for repairing a road, characterized in that: The following steps are involved: 1) Determine the location and depth of road damage; 2) Arrange and drill holes at the road damage locations, then perform grouting, hole sealing and maintenance; The grouting slurry is the polyurethane grouting material according to any one of claims 1 to 8.

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