Polyurea joint filling material capable of being repaired on site

Abstract

The invention belongs to the technical field of building materials, and particularly discloses a polyurea joint filling material capable of achieving site repair and application of the polyurea joint filling material. The material is prepared by mixing a component P and a component I according to a mass ratio of 100: (150-220), the component P comprises polyether polyol, an amine chain extender, a calcium carbonate filler, a plasticizer and an auxiliary agent; and the component I is modified isocyanate synthesized by polyether polyol and an isocyanate monomer. By optimizing the synergistic effect of the amine chain extender and the zinc catalyst, the material can be quickly cured in a wide temperature range from-10 DEG C to 50 DEG C (surface drying is less than or equal to 45 minutes), and zero VOC release is realized in the construction process. The obtained restoration has high tensile strength (greater than or equal to 4.0 MPa), ultrahigh elongation (greater than or equal to 400%) and excellent weather resistance, is suitable for on-site rapid restoration of cracks of infrastructures such as roads and bridges, and remarkably improves the engineering efficiency and durability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and specifically discloses a polyurea joint filling material capable of repairing on site and application thereof. BACKGROUND

[0002] With the increase of the service life of infrastructure, the sealing failure problems of expansion joints, settlement joints and construction joints are prone to occur in bridges, tunnels, roads and the like. Traditional joint filling materials such as concrete and asphalt-based materials have defects such as insufficient aging resistance, easy cracking under high-low temperature cycles, attenuation of adhesion to base materials, low construction efficiency and the like in the long-term use process, and are difficult to meet the demand of modern engineering for "high durability, rapid curing, environmental protection and low toxicity".

[0003] 1. Curing delay and stress concentration of rigid materials - concrete needs ≥24 hours of initial setting (20℃ environment), and the shrinkage rate reaches 0.04-0.06%, which leads to the risk of interface peeling (adhesion strength <1.5MPa); 2. Weather resistance imbalance of flexible materials - the softening point of asphalt-based joint filling agent decreases sharply under ultraviolet irradiation (60℃→45℃), and the elongation rate decays by >50% (initial 400%→<200% after 6 months), and the annual average maintenance frequency reaches 2-3 times; 3. Conflict between environmental protection and construction efficiency - although solvent-based polyurethane materials can achieve 30 minutes of surface drying, the VOC release amount is >250g / L (benzene series accounts for 40%), which violates the GB 33372-2020 standard (limit value 100g / L), and the fluidity is lost at low temperature (<5℃) (viscosity >5000mPa·s); 4. Single function of composite materials - although the epoxy-asphalt composite system improves chemical resistance, the embrittlement temperature rises to -5℃ (cracking rate >30% in cold regions), and cannot be compatible with rapid repair scenarios (operable time <8 minutes).

[0004] The existing improvement schemes have significant defects: silicone sealant: although the weather resistance is excellent (-50~200℃), the strength is too low (tensile strength ≤0.8MPa), and it cannot bear heavy equipment traffic; fast-curing cement: 20 minutes of initial setting is accompanied by a heat release peak >80℃ (temperature difference crack rate ↑15%), and the elongation rate is <0.1%; solvent-free polyurethane: VOC meets the standard but low-temperature curing is delayed (curing time ≥120 minutes at 5℃), and cannot meet the winter construction demand.

[0005] Therefore, it is urgent to develop a joint filling material which has rapid curing (surface drying ≤45 minutes), wide temperature range adaptability (-10~50℃ construction), high mechanical strength (tensile strength ≥4.0MPa, elongation rate ≥400%) and zero VOC release, so as to break through the technical barriers of traditional materials in large infrastructure repair scenarios. SUMMARY

[0006] To solve the above prior art problems, the application provides a polyurea joint filling material capable of being repaired on site.

[0007] To achieve the above object, the application solves the technical problem by adopting the following technical scheme:

[0008] A polyurea joint filling material capable of being repaired on site is prepared by mixing P component and I component in a mass ratio of 100:(150-220).

[0009] The P component comprises, in mass parts:

[0010] Polyether polyol with a functionality of 2-3.5 and a molecular weight of 2000-6000: 10-30 parts;

[0011] Amine chain extender with a functionality of 2 and a molecular weight of 100-500: 20-40 parts;

[0012] Calcium carbonate filler: 15-50 parts;

[0013] Plasticizer: 10-30 parts (at least one selected from dioctyl phthalate and propylene carbonate);

[0014] Organic siloxane defoaming agent: 0.2-1.0 parts;

[0015] Zinc catalyst: 0.05-1.0 parts;

[0016] Carbon black: 0.1-0.5 parts;

[0017] The I component is modified isocyanate synthesized from polyether polyol with a functionality of 2-4 and a molecular weight of 1500-7500 and isocyanate monomer selected from at least one of MDI and TDI.

[0018] The principle of the scheme is that the amine chain extender (functionality 2) and the zinc catalyst synergistically catalyze the polyurea reaction, and the high-filled calcium carbonate improves the mechanical strength. The beneficial effects are that the super-fast curing (≤45 minutes), super-high elongation (≥400%) and wide temperature range construction (-10-50℃) are achieved, and the performance bottleneck of traditional materials is broken through.

[0019] Further, the mass ratio of the P component to the I component in the above polyurea joint filling material capable of being repaired on site is 100:(180-200). The principle is that the NCO / active hydrogen ratio is optimized by limiting P:I=100:(180-200) to avoid excessive crosslinking or insufficient reaction. The beneficial effects are that the tensile strength (≥5MPa) and the elongation (≥450%) are balanced, and the durability of the repair body is improved (see the data of Example 2).

[0020] Further, the above-mentioned polyurea joint filling material capable of repairing on site, the polyether polyol in the P component is a polyoxypropylene triol with a molecular weight of 3000-5000 and a functionality of 3. Principle: A moderate crosslinking network is formed by using a polyether triol with a functionality of 3 and a molecular weight of 3000-5000. Advantage: The cohesive strength of the material is enhanced (Shore hardness HA 60-70), while the flexibility and crack resistance are maintained.

[0021] Further, the above-mentioned polyurea joint filling material capable of repairing on site, the amine chain extender is selected from at least one of diethyl toluene diamine (DETDA) and dimethylthio toluene diamine (DMTDA). Principle: DETDA / DMTDA contains a hindered amine group, which has high reactivity at low temperature and avoids the curing delay of ordinary alcohol chain extenders. Advantage: Ensures workability at -10℃ (viscosity <3000 mPa·s), solves the problem of winter construction (compared with Comparative Example 3).

[0022] Further, the above-mentioned polyurea joint filling material capable of repairing on site, the calcium carbonate filler has a particle size of 800-1500 mesh and is surface treated with a silane coupling agent. Principle: Silane treatment of ultra-fine calcium carbonate (800-1500 mesh) improves interfacial compatibility and reduces stress concentration. Advantage: The bonding strength is increased to ≥2.5 MPa (after wet heat), and the interfacial peeling is inhibited (compared with Comparative Example 1).

[0023] Further, the above-mentioned polyurea joint filling material capable of repairing on site, the zinc catalyst is zinc octoate or zinc iso-octoate, and the amount used is 0.1-0.5 parts. Principle: The zinc catalyst (0.1-0.5 parts) selectively accelerates the amine-isocyanate reaction, which is still efficient at low temperature. Advantage: The surface drying time at 5℃ is ≤60 minutes (compared with Comparative Example 4, which is >180 minutes without the zinc catalyst).

[0024] Further, the above-mentioned polyurea joint filling material capable of repairing on site, the synthesis method of the I component is: the polyether polyol and the isocyanate monomer are reacted at 65-85℃ for 1-4 hours, and the NCO content is controlled at 12-18wt%. Principle: The NCO content of the I component is controlled at 12-18wt%, ensuring controllable reaction activity and molecular weight. Advantage: Avoids the strength reduction caused by insufficient NCO (the tensile strength of Comparative Example 5 is only 2.3 MPa).

[0025] The application also discloses a preparation method of the joint filling material.

[0026] (1) Preparation of the P component: the raw materials are stirred and mixed at 25-40℃ for 0.5-1 hour. Principle: Low-temperature mixing (25-40℃) of the P / I components avoids pre-polymerization, and rapid stirring triggers curing during construction. Advantage: The on-site operation is simple, the load can be carried in 45 minutes, and the repair efficiency is improved by more than 5 times.

[0027] (2) Preparation of I component: polyether polyol is reacted with isocyanate monomer at 65-85℃ for 1-4 hours;

[0028] (3) During construction, P and I components are mixed and stirred at room temperature for 30-60 seconds, and curing is completed within 45±10 minutes after pouring.

[0029] Further, in the above preparation method, the mixing and stirring in step (3) is carried out by using a two-component spraying device with a pressure ratio of 2:1-4:1, and the pouring environment has a humidity of ≤85%. Principle: The two-component device with a pressure ratio of 2:1-4:1 forcibly mixes to ensure the uniformity of the high-viscosity system. Beneficial effect: No bubble defects in an environment with a humidity of ≤85%, and the restoration body is dense and defect-free (0 cracks in dynamic fatigue test).

[0030] The application also discloses the above-mentioned site restoration method, and uses the above-mentioned filling material, and comprises the following steps:

[0031] Cleaning the gap to be restored to a depth of ≥20 mm;

[0032] Pouring the mixed P / I components into the gap;

[0033] Curing and forming under an environmental temperature of-10℃ to 50℃,

[0034] The obtained restoration body has a tensile strength of ≥4.0 MPa, an elongation of ≥400%, and a Shore hardness HA of 60-70. Principle: Deep gap pouring (≥20 mm) combined with wide temperature curing adapts to complex working conditions of infrastructure cracks. Beneficial effect: Single restoration life is more than 5 years (annual maintenance is less than 0.5 times), and the comprehensive cost is reduced by 80% (see test example 5).

[0035] Compared with the prior art, the application has the following outstanding beneficial effects:

[0036] The application breaks through the technical bottleneck of traditional filling materials and realizes multi-dimensional performance improvement through innovative formula design:

[0037] 1) High-efficiency construction adaptability: amine chain extenders (such as DETDA / DMTDA) and zinc catalysts cooperatively accelerate the reaction, maintain low-viscosity fluidity in severe cold to high-temperature environments (-10℃ to 50℃), ensure curing within 45 minutes, and overcome the defects that solvent-type materials cannot be constructed at low temperatures and cement-based materials cure slowly.

[0038] 2) Excellent durability: polyurea main chain structure combined with superfine calcium carbonate fillers endows the material with super-high elongation and anti-fatigue properties, and the mechanical property retention rate is more than 90% under the erosion of ultraviolet light, heat and humidity and salt spray, completely solving the problems of softening failure of asphalt-based materials and insufficient strength of silicone glue.

[0039] 3) Green environmental protection advantage: the whole system adopts solvent-free formula, eliminates VOC and heavy metal pollution from the source, and meets the strict environmental protection standard.

[0040] 4) Significant economic benefit: the material has long service life and low maintenance characteristics, which greatly reduces the comprehensive cost of infrastructure repair. In general, the material provides a technically reliable and environmentally friendly solution for rapid repair of large infrastructure. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the present application, if no special description is made, the numerical range is regarded as continuous and includes the minimum value and the maximum value of the range and every value between the minimum value and the maximum value. Further, when the range refers to an integer, every integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or a characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges.

[0043] In the present application, the specific dispersion and stirring treatment method is not particularly limited.

[0044] In the present application, the test method used is a conventional method unless otherwise specified; the materials, reagents, etc. used are reagents and materials available from commercial channels unless otherwise specified.

[0045] Table 1 Raw material parameter table

[0046]

[0047]

[0048]

[0049] Example 1

[0050] One kind of polyurea joint filling material that can be repaired on site is composed of P component and I component with a mass ratio of 100:150.

[0051] The P component includes polyoxypropylene triol (functionality 3, molecular weight 3000) 10 parts, DETDA (molecular weight 178) 20 parts, silane treated calcium carbonate (1250 mesh) 15 parts, dioctyl phthalate 10 parts, organosiloxane defoaming agent 0.2 parts, zinc octoate 0.05 parts, and carbon black 0.1 parts.

[0052] The I component is synthesized from polyether polyol (functionality 2, molecular weight 1500) and diphenyl methane diisocyanate.

[0053] Two, a preparation method of a field repairable polyurea joint filling material, comprising the following steps:

[0054] 1. The P component is prepared by weighing the raw materials according to the above mass parts, mixing the P component raw materials at 30°C and 200 rpm for 30 min.

[0055] 2. The I component is prepared by mixing polyether polyol (functionality 2, molecular weight 1500) and diphenyl methane diisocyanate at a mass ratio of 100:30, and reacting at 75°C for 1 hour.

[0056] 3. The P component and the I component are mixed uniformly at room temperature, poured into the field gap, and cured at room temperature.

[0057] Performance test:

[0058] Tensile strength: 4.2 MPa (GB / T 528)

[0059] Elongation: 420% (GB / T 528)

[0060] Viscosity at -10°C: 1800 mPa·s (GB / T 10247)

[0061] VOC release: not detected (GB 33372-2020)

[0062] Example 2

[0063] One, a field repairable polyurea joint filling material, composed of a P component and an I component at a mass ratio of 100:200;

[0064] The P component includes polyether polyol (functionality 3.5, molecular weight 5000) 20 parts, DMTDA (molecular weight 214) 30 parts, calcium carbonate (1000 mesh, silane treated) 35 parts, propylene carbonate 20 parts, defoaming agent 0.6 parts, zinc isooctoate 0.3 parts, and carbon black 0.3 parts.

[0065] The I component is synthesized from polyether polyol (functionality 4, molecular weight 6000) and toluene diisocyanate.

[0066] Two, a method for preparing a field-repairable polyurea joint material, comprising the following steps:

[0067] 1. The P component is prepared by mixing the raw materials in the P component according to the above mass parts at 25°C and 200 rpm for 1 hour.

[0068] 2. The I component is prepared by mixing the polyether polyol (functional degree 4, molecular weight 6000) and TDI at a mass ratio of 100:37 at 80°C for 2.5 hours.

[0069] 3. The P component and the I component are mixed uniformly at room temperature and cured at room temperature to form a shape.

[0070] Performance test:

[0071] Tensile strength: 5.1 MPa

[0072] Elongation: 450%

[0073] Viscosity at 50°C: 1500 mPa·s

[0074] Elongation retention rate after 1000 hours of ultraviolet aging: 92% (ISO 4892-3)

[0075] Example 3

[0076] One, a field-repairable polyurea joint material is prepared by mixing the P component and the I component at a mass ratio of 100:220.

[0077] The P component includes polyether polyol (functional degree 2, molecular weight 6000) 30 parts, DETDA / DMTDA complex (1:1) 40 parts, calcium carbonate (800 mesh) 50 parts, dioctyl phthalate 30 parts, defoamer 1.0 part, zinc octoate 1.0 part, and carbon black 0.5 part.

[0078] The I component is synthesized by mixing polyether polyol (functional degree 3, molecular weight 7500) and diphenyl methane diisocyanate.

[0079] Two, a method for preparing a field-repairable polyurea joint material, comprising the following steps:

[0080] 1. The P component is prepared by mixing the raw materials in the P component according to the above mass parts at 40°C and 200 rpm for 48 minutes.

[0081] 2. The I component is prepared by mixing the polyether polyol (functional degree 3, molecular weight 7500) and diphenyl methane diisocyanate at a mass ratio of 100:40 at 65°C for 4 hours.

[0082] 3. Mix P component and I component at room temperature, and solidify and form at room temperature.

[0083] Performance test:

[0084] Tensile strength at -10°C: 3.8 MPa

[0085] Elongation: 390%

[0086] Hardness change after hot and humid aging (85°C / 85% RH, 30 days): +3 HA.

[0087] Comparative Example 1

[0088] Comparative Example 1 is a conventional concrete, specifically:

[0089] Mix cement, sand, and water at a solid-liquid ratio of 1:2:0.4, and cure at 20°C for 24 hours to initiate setting.

[0090] Performance:

[0091] Tensile strength at 28 days: 1.2 MPa

[0092] Shrinkage: 0.05% (interface peeling)

[0093] Cannot be constructed at -10°C.

[0094] Comparative Example 2

[0095] Comparative Example 2 is an asphalt-based joint sealant, specifically:

[0096] Mix 70# road asphalt and 20% SBS modification.

[0097] Performance:

[0098] Initial elongation: 380%

[0099] Elongation after 6 months of ultraviolet aging: 175%

[0100] Softening deformation at 60°C.

[0101] Comparative Example 3

[0102] Comparative Example 3 differs from Example 2 in that Comparative Example 3 uses a common diol chain extender instead of the amine-free chain extender DMTDA, and is otherwise the same.

[0103] Performance:

[0104] Curing time: 120 minutes (25°C)

[0105] Tensile strength: 1.8 MPa

[0106] Viscosity at -10°C: 6800 mPa·s (cannot be poured).

[0107] Comparative Example 4

[0108] Comparative Example 4 differs from Example 2 in that Comparative Example 4 has no zinc catalyst (zinc isooctoate), and is otherwise identical.

[0109] Performance:

[0110] Curing time at 5℃: >180 minutes

[0111] Elongation: 210% (incomplete curing).

[0112] Test Example 1

[0113] The polyurea joint filling materials prepared in Examples 1-3 and Comparative Examples 1-5 were respectively tested for low-temperature curing performance to analyze their construction adaptability in a wide temperature range.

[0114] Test method:

[0115] The viscosity of the mixed slurry at different temperatures was tested using a rotational viscometer (model: Brookfield DV2T).

[0116] Temperature gradient: -10℃, 5℃, 25℃, 50℃.

[0117] Shear rate: 10 s -1 (simulating the state of pouring).

[0118] Curing time determination:

[0119] According to the GB / T 13477 standard, the open time (penetration depth ≤0.1mm) was determined using a penetrometer (0.5mm needle).

[0120] Table 2: Low-temperature curing performance test results

[0121]

[0122] In the table, “*” indicates that the concrete could not be stirred at -10℃.

[0123] As can be seen from Table 2, the viscosity of the polyurea joint filling materials prepared in Examples 1-3 was all <3000 mPa·s (pumpable critical value) at -10℃, while the viscosity of the polyurea joint filling material prepared in Comparative Example 3 without amine chain extender increased sharply, and the absence of zinc catalyst in Comparative Example 4 resulted in a 4-fold delay in curing at 5℃, proving the necessity of low-temperature catalysis.

[0124] Test Example 2

[0125] Different polyurea joint filling materials were tested for ultraviolet aging durability to analyze their long-term weather resistance and strength retention rate

[0126] Test method:

[0127] UV accelerated aging according to ISO 4892-3:

[0128] Irradiance: 0.76 W / m 2 @340 nm

[0129] Cycle: 4h UV (60°C) + 4h condensation (50°C)

[0130] Every 500h sample test: tensile strength, mass loss rate (precision 0.1 mg), surface chalking grade (reference ISO 4628-6: 0 grade no chalking -> 5 grade severe).

[0131] Table 3: UV aging durability test results table

[0132]

[0133] In the table: "*" is the 60°C test.

[0134] From Table 3, it can be seen that the amine chain extender of Example 2 forms a dense urea bond, so that the strength retention rate of the polyurea joint filling material after 2000h of UV aging is as high as 92%, while the asphalt-based aromatic hydrocarbon in Comparative Example 2 is photolyzed, resulting in a mass loss of 12% and a collapse of strength.

[0135] Test Example 3

[0136] Dynamic fatigue performance test

[0137] Purpose: to verify the crack following property of high elongation (≥400%)

[0138] Method:

[0139] Design a crack opening and closing cycle device according to ASTM C794:

[0140] Concrete base plate gap width: 10mm

[0141] Cycle conditions: 0.5Hz frequency, ±25% amplitude stretching (simulating thermal expansion and contraction)

[0142] After 1 million cycles, record:

[0143] Bond failure area ratio (interface peeling evaluation)

[0144] Number of material body cracks

[0145] Table 4: Dynamic fatigue performance test results table

[0146] Group Adhesion intact rate after 100,000 cycles Number of body cracks (striations / cm 2 )]]> Example 3 98％ 0 Comparative Example 1 30％ 15 (through crack) Comparative Example 4 65％ 8

[0147] From Table 4, it can be seen that Comparative Example 4 without zinc catalyst resulted in incomplete curing, leading to a decrease in cohesive strength and causing the body to crack. Comparative Example 1 showed brittle fracture of the concrete, and the interface peeling rate reached 70%.

[0148] Test Example 4

[0149] Environmental friendliness and VOC release

[0150] Method:

[0151] Test volatile organic compounds according to GB 33372-2020 standard:

[0152] Crush the cured material through a 40-mesh sieve

[0153] Headspace-GCMS (Agilent 8890 / 5977B)

[0154] Conditions: 120°C heating for 30 min, capturing released gas

[0155] Hazardous heavy metal detection:

[0156] ICP-MS analysis after microwave digestion.

[0157] Table 5 Environmental friendliness and VOC release table

[0158]

[0159] ND*: not detected (detection limit 0.1 μg / g).

[0160] As can be seen from Table 5, Example 1 contains a zinc catalyst instead of traditional lead / mer additives, achieving zero environmental toxicity.

[0161] Test Example 5

[0162] According to GB / T 16777-2008, test the bonding strength of different polyurea joint filling materials in a humid heat / salt spray environment, and analyze their interface durability.

[0163] Test method:

[0164] Substrate treatment: concrete (C40), steel plate (Q235), asphalt mixture.

[0165] Environmental aging:

[0166] Scheme A: 85°C / 85% RH, 30 days

[0167] Scheme B: 5% NaCl salt spray, 1000h

[0168] Tensile rate: 10 mm / min

[0169] Table 6 Bonding strength table

[0170]

[0171]

[0172] From Table 6, it can be seen that the comparative example 3 without amine chain extender has interface peeling (smooth bonding surface) in the humid heat environment, while the example 2 maintains cohesive failure (material body fracture) on all substrates.

[0173] In summary, the present application provides a polyurea joint sealing material that can be repaired on site. Compared with traditional repair materials, the polyurea joint sealing material of the present application has a viscosity of <3000 mPa·s at a temperature of -10℃, and a surface drying time of ≤60 minutes at 5℃, has good wide temperature range construction performance, and still has a high tensile strength retention rate after 2000 hours of ultraviolet aging, and a bonding strength attenuation rate of less than 10% in a salt spray / humid heat environment, which is significantly better than asphalt-based materials and ordinary concrete. At the same time, after 100,000 times of crack opening and closing cycles, the body has no cracks, and the bonding integrity rate is >98%. It has good dynamic stability, which is helpful for the development of industrial protection technology.

[0174] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A field-repairable polyurea caulk material, characterized in that The P component and the I component are mixed in a mass ratio of 100:(150-220); The P component comprises, by mass parts: Polyether polyol with a functionality of 2-3.5 and a molecular weight of 2000-6000: 10-30 parts; Amine chain extender with a functionality of 2 and a molecular weight of 100-500: 20-40 parts; Calcium carbonate filler: 15-50 parts; Plasticizer: 10-30 parts (at least one selected from dioctyl phthalate and propylene carbonate); Organic siloxane defoaming agent: 0.2-1.0 parts; Zinc catalyst: 0.05-1.0 parts; Carbon black: 0.1-0.5 parts; The I component is a modified isocyanate synthesized from a polyether polyol with a functionality of 2-4 and a molecular weight of 1500-7500 and an isocyanate monomer selected from at least one of MDI and TDI.

2. The joint filler material of claim 1, wherein The mass ratio of the P component to the I component is 100:(180-200).

3. The joint filler material of claim 1, wherein The polyether polyol in the P component is polyoxypropylene triol with a molecular weight of 3000-5000 and a functionality of 3.

4. The joint filler material of claim 1, wherein The amine chain extender is at least one selected from diethyltoluene diamine (DETDA) and dimethylthio toluene diamine (DMTDA).

5. The joint filler material of claim 1, wherein The calcium carbonate filler has a particle size of 800-1500 mesh and is surface treated with a silane coupling agent.

6. The joint filler material of claim 1, wherein The zinc catalyst is zinc octoate or zinc iso-octoate, and the amount used is 0.1-0.5 parts.

7. The joint filler material of claim 1, wherein The synthesis method of the I component is that the polyether polyol and the isocyanate monomer are reacted at 65-85°C for 1-4 hours, and the NCO content is controlled at 12-18wt%.

8. The method for preparing the sealant as described in any one of claims 1-7, characterized in that, It comprises: (1) Preparation of the P component: stir and mix the raw materials at 25-40°C for 0.5-1 hour; (2) Preparation of the I component: react the polyether polyol and the isocyanate monomer at 65-85°C for 1-4 hours; (3) When constructing, mix and stir the P and I components in proportion at room temperature for 30-60 seconds, and complete curing within 45±10 minutes after pouring.

9. The production method according to claim 8, characterized by, The mixing and stirring in step (3) is implemented by using a two-component spraying device with a pressure ratio of 2:1-4:1, and the pouring environment has a humidity of ≤85%.

10. A method of site remediation, characterized by, The use of the caulking material according to any one of claims 1-7 comprises the following steps: Clean the gap to be repaired to a depth of ≥20mm; Pour the mixed P / I components into the gap; Cure and form at an ambient temperature of -10°C to 50°C, The obtained repair body has a tensile strength of ≥4.0MPa, an elongation of ≥400%, and a Shore hardness of HA60-70.

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