MMA polymer pavement ultra-thin ultra-fast repair material and preparation method and construction method thereof

Abstract

This invention provides an ultra-thin, ultra-fast repair material for MMA polymer pavement, along with its preparation and application methods. The material comprises component A and component B. Component A includes methyl methacrylate, acrylic resin, n-butyl methacrylate, 2-ethylhexyl acrylate, urethane acrylate, hydroxypropyl methylcellulose, a composite reinforcing agent, pigments, an ultraviolet shielding agent, and a dispersant. Component B includes benzoyl peroxide, methyl ethyl ketone peroxide, cobalt naphthenate, zinc isooctanoate, and dibutyl phthalate. This ultra-thin, ultra-fast repair material, through optimization of the composite initiator-promoter system, extends the application temperature range to -30°C to 35°C, solving the problems of traditional materials being unable to be applied in winter and the poor durability of thin-layer repair materials. Furthermore, it maintains high curing speed, high strength, and high durability even at low temperatures.

Description

Technical Field

[0001] This invention belongs to the field of airport, highway and bridge pavement maintenance, and in particular relates to an MMA polymer pavement ultrathin and ultrafast emergency repair material and its preparation and construction methods. Background Technology

[0002] During long-term service, asphalt and concrete pavements are susceptible to surface defects such as hollowing, pitting, peeling, flaking, sanding, cracking, and exposed reinforcement due to factors such as freeze-thaw cycles, heavy-load compaction, carbon dioxide carbonization, rainwater and de-icing agent erosion. If not repaired in time, the defects will gradually expand, affecting pavement safety and increasing maintenance costs. The mainstream pavement thin-layer repair materials currently have obvious defects: (1) Fast-hardening cement materials: rigidity is high, flexural strength is poor (flexural strength is only about 2MPa), construction is not possible in winter (below 5℃), curing cycle is long (28 days to reach design strength), and corrosion resistance is poor; (2) Polyurethane resin materials: outdoor aging is serious, compressive strength is low (30-35MPa), whitening phenomenon is easy to occur after construction, and curing reaction is easily affected by humidity; (3) Epoxy resin materials: poor weather resistance, easy to crack at low temperature, long curing time (strength appears in 24 hours), construction temperature is limited to above 8℃, and toxic gases are produced in the event of a fire.

[0003] MMA (methyl methacrylate) polymer materials have attracted attention due to their fast reaction speed and excellent mechanical properties. However, existing MMA repair materials still suffer from problems such as unreasonable formulation ratios, insufficient low-temperature curing activity, poor compatibility between the reinforcement and the resin, and unsatisfactory workability. Therefore, developing an ultra-thin and ultra-fast emergency repair material for MMA polymers that combines ultra-fast curing, wide temperature range application, ultra-thin layer application, high strength, and durability is of great significance for efficient pavement maintenance. Summary of the Invention

[0004] In view of this, the present invention aims to overcome the defects in the prior art and proposes an MMA polymer pavement ultrathin and ultrafast emergency repair material, as well as its preparation method and construction method.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] In a first aspect, the present invention provides an MMA polymer pavement ultrathin and ultrafast emergency repair material, the material comprising component A and component B, wherein:

[0007] Component A comprises the following components in parts by weight: 25-28 parts methyl methacrylate, 12-15 parts acrylic resin, 6-8 parts n-butyl methacrylate, 8-10 parts 2-ethylhexyl acrylate, 7-9 parts urethane acrylate, 1.5-2.5 parts hydroxypropyl methylcellulose, 22-25 parts composite reinforcement, 2.5-3.5 parts pigment, 0.3-0.5 parts ultraviolet shielding agent, and 0.2-0.4 parts dispersant;

[0008] Component B comprises the following components in parts by weight: 1.0-1.2 parts benzoyl peroxide, 0.8-1.0 parts methyl ethyl ketone peroxide, 0.6-0.8 parts cobalt naphthenate, 0.4-0.6 parts zinc isooctanoate, and 0.4-0.8 parts dibutyl phthalate.

[0009] Preferably, the mass ratio of component A to component B is 100:(3.8-4.3).

[0010] Preferably, the acrylic resin is polymethyl methacrylate with a molecular weight of 50,000-80,000.

[0011] Preferably, the ultraviolet shielding agent is one or a mixture of two of titanium dioxide (TiO2), cerium dioxide (CeO2), and zirconium dioxide (ZrO2).

[0012] Preferably, the dispersant is a polycarboxylate dispersant.

[0013] Preferably, the composite reinforcement comprises the following components in parts by weight: 0.8-1.2 parts chopped glass fiber, 0.5-0.8 parts nylon fiber, 7-9 parts heavy calcium carbonate, and 13-14 parts composite inorganic filler.

[0014] More preferably, the chopped glass fibers are 3-5 mm long and 10-15 μm in diameter, the nylon fibers are 2-3 mm long and 8-12 μm in diameter, and the heavy calcium carbonate has a particle size of 200-300 mesh.

[0015] Preferably, the composite inorganic filler comprises silica sand, bauxite powder, corundum, and bentonite in a mass ratio of 4:3:2:1.

[0016] More preferably, the silica sand has a particle size of 80-100 mesh, the bauxite powder has a particle size of 100-150 mesh, the corundum has a particle size of 150-200 mesh, and the bentonite has a particle size of 200-300 mesh.

[0017] Preferably, the pigment comprises rutile titanium dioxide and iron oxide pigment in a mass ratio of 3:1.

[0018] Secondly, the present invention also provides a method for preparing the above-mentioned MMA polymer pavement ultrathin and ultrafast emergency repair material, the preparation method comprising the steps of preparing component A and component B respectively, wherein the preparation of component A is as follows:

[0019] S11. Add methyl methacrylate, acrylic resin, n-butyl methacrylate, and 2-ethylhexyl acrylate to the reactor, heat to 50-55℃, and stir at low speed until the acrylic resin is completely dissolved to obtain the first mixture.

[0020] S12. Add urethane acrylate and UV shielding agent to the first mixture, stir at medium speed, then add hydroxypropyl methylcellulose and dispersant, and continue stirring at medium speed to obtain the second mixture.

[0021] S13. Short glass fibers, nylon fibers, heavy calcium carbonate and composite inorganic fillers are added to a dry powder mixer and stirred at high speed to obtain a composite reinforcement.

[0022] S14. Add the composite reinforcement to the second mixture in batches, stir at medium speed first and then at low speed, and finally add the pigment. After stirring, filter to obtain component A.

[0023] The preparation of component B is as follows:

[0024] Dibutyl phthalate was added sequentially to benzoyl peroxide and methyl ethyl ketone peroxide under low-speed stirring until completely dissolved. Then cobalt naphthenate and zinc isooctanoate were added, and stirring was continued to obtain component B.

[0025] Preferably, the low-speed stirring speed is 300-400 r / min and the time is 5-10 min; the medium-speed stirring speed is 600-800 r / min and the time is 10-12 min; and the high-speed stirring speed is 1000-1200 r / min and the time is 5-10 min.

[0026] Thirdly, the present invention also provides a construction method for pavement repair using the above-mentioned MMA polymer pavement ultrathin and ultrafast emergency repair material, the construction method comprising the following steps:

[0027] Step 1: Surface preparation: Clean the surface to be repaired and ensure the moisture content is ≤8%;

[0028] Step 2, Primer Application: Apply the elastic primer to the substrate at a rate of 0.2-0.3 kg / m². 2 Incubate at room temperature for 10-15 minutes;

[0029] Step 3: Repair Material Application: Mix component A and component B of the above-mentioned MMA polymer pavement ultra-thin and ultra-fast repair material thoroughly. Apply the thoroughly mixed MMA polymer pavement ultra-thin and ultra-fast repair material to the surface of the elastic primer, with a coating amount of 0.2-0.3 kg / m². 2 The thickness should be controlled between 1-10mm;

[0030] Step 4: Curing and Opening: Cure at an ambient temperature of 25-35℃ for 15-20 minutes, or at an ambient temperature of -30-5℃ for 25-30 minutes. Once the surface hardness is ≥ Shore D75, traffic can be opened.

[0031] Preferably, the elastic primer comprises the following components in parts by weight: 92-94 parts trimethylolpropane triacrylate, 3-5 parts silane coupling agent, 1-2 parts nano silica, and 0.2-0.5 parts defoamer.

[0032] Preferably, the silane coupling agent is one or a mixture of two or more of the following: KH-550, titanate coupling agent TL808, aluminate coupling agent 6253, zirconate coupling agent 108, and organochromium coupling agent YM-202.

[0033] Preferably, the particle size of the nano-silica is 50-100 nm.

[0034] Preferably, the defoamer is an organosilicon defoamer.

[0035] The elastic primer is prepared as follows: Trimethylolpropane triacrylate is added to a reaction vessel, heated to 40-45°C, and a silane coupling agent is added under low-speed stirring for 5-10 minutes; nano-silica and defoamer are added, the temperature is raised to 50-55°C, and the mixture is stirred at medium speed for 20-25 minutes; the temperature is lowered to room temperature, and the mixture is filtered to obtain the elastic primer.

[0036] The trimethylolpropane triacrylate in the elastic primer of this invention works synergistically with the silane coupling agent to penetrate and seal the capillary pores of concrete, preventing moisture erosion, and to bond with the substrate and the upper repair material through chemical bonds, forming a strong bonding system of "substrate-primer-repair material".

[0037] In the MMA polymer pavement ultrathin and ultrafast repair material of this invention, methyl methacrylate (MMA) serves as the main monomer to provide basic strength, acrylic resin enhances rigidity, n-butyl methacrylate and 2-ethylhexyl acrylate improve flexibility, and urethane acrylate enhances weather resistance and adhesion. The resulting copolymer network structure possesses both rigidity and toughness. In the composite reinforcement, chopped glass fibers and nylon fibers are interleaved to inhibit crack propagation; graded inorganic fillers optimize density and improve compressive strength and abrasion resistance. Component B uses a BPO / MEKP composite initiator and a cobalt naphthenate / zinc isooctanoate composite accelerator to rapidly generate free radicals over a wide temperature range via a redox reaction, initiating monomer polymerization and crosslinking to achieve ultrafast curing, while avoiding the problems of insufficient low-temperature activity or high-temperature reaction runaway in single initiation systems.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] (1) Wide temperature range construction, strong winter applicability: Through the optimization of the composite initiation-promoting system, the construction temperature range is extended to -30℃ to 35℃, which solves the problem that traditional materials cannot be constructed in winter, and can still ensure curing speed and strength at low temperatures;

[0040] (2) Ultra-fast curing with minimal impact on traffic: Traffic can be opened within 15 minutes in summer and 30 minutes in winter, which is far superior to epoxy resin (2 hours), polyurethane (12-48 hours) and fast-hardening cement (4 hours), and is especially suitable for airport construction without interruption.

[0041] (3) Excellent mechanical properties: compressive strength ≥55MPa, flexural strength ≥12MPa, bond strength ≥3.8MPa, abrasion resistance (750g / 500r) ≤0.015g, able to withstand repeated crushing by heavy aircraft, with no cracking or falling off in the later stage;

[0042] (4) Outstanding durability: With the addition of ultraviolet shielding agent and PUA resin, it can withstand artificial weathering (400h) without cracking or powdering; it can withstand 3% NaCl solution for 7d without change, and 10% H2SO4 solution for 48h with only slight discoloration, and its service life can reach more than 5 years.

[0043] (5) Good operability and economy: The A and B components are simple to mix and do not require precise measuring equipment; the repair thickness is only 1mm or more, the raw material consumption is low, and the overall maintenance cost is reduced by more than 40%; the construction is dust-free and there is no release of toxic gases, which meets the environmental protection requirements. Attached Figure Description

[0044] Figure 1 This is a flowchart of the construction process of the present invention;

[0045] Figure 2 This is a schematic diagram of the road surface structure after repair according to the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below.

[0047] This invention provides an MMA polymer pavement ultrathin and ultrafast emergency repair material, comprising component A and component B. The MMA polymer pavement ultrathin and ultrafast emergency repair material is formed by mixing component A and component B in a mass ratio of 100:(3.8-4.3).

[0048] Component A comprises the following components in parts by weight:

[0049] Methyl methacrylate (MMA): 25-28 parts;

[0050] Acrylic resin (PMMA, molecular weight 50,000-80,000): 12-15 parts;

[0051] Butyl methacrylate (BMA): 6-8 parts;

[0052] 2-Ethylhexyl acrylate (2-EHA): 8-10 parts;

[0053] urethane acrylate (PUA): 7-9 parts;

[0054] Hydroxypropyl methylcellulose (HPMC): 1.5-2.5 parts;

[0055] Composite reinforcement: 22-25 parts;

[0056] Pigment: 2.5-3.5 parts;

[0057] UV shielding agent: 0.3-0.5 parts;

[0058] Dispersant (polycarboxylate dispersant): 0.2-0.4 parts;

[0059] The composite reinforcement comprises the following components in parts by weight:

[0060] Short-cut glass fibers (3-5 mm in length and 10-15 μm in diameter): 0.8-1.2 parts;

[0061] Nylon fiber (2-3 mm in length, 8-12 μm in diameter): 0.5-0.8 parts;

[0062] Heavy calcium carbonate (particle size 200-300 mesh): 7-9 parts;

[0063] Composite inorganic filler: 13-14 parts;

[0064] Furthermore, the composite inorganic filler is a mixture of silica sand (80-100 mesh), bauxite powder (100-150 mesh), corundum (150-200 mesh), and bentonite (200-300 mesh) in a mass ratio of 4:3:2:1.

[0065] Furthermore, the pigment is a mixture of titanium dioxide (rutile type) and iron oxide pigment in a mass ratio of 3:1.

[0066] Component B comprises the following components in parts by weight:

[0067] Benzoyl peroxide (BPO): 1.0-1.2 parts;

[0068] Methyl ethyl ketone peroxide (MEKP): 0.8-1.0 parts;

[0069] Cobalt naphthenate: 0.6-0.8 parts;

[0070] Zinc isooctanoate: 0.4-0.6 parts;

[0071] Dibutyl phthalate (DBP): 0.4-0.8 parts;

[0072] The present invention also includes an elastic primer, comprising the following components in parts by weight:

[0073] Trimethylolpropane triacrylate: 92-94 parts;

[0074] Silane coupling agent: 3-5 parts;

[0075] Nano-silica (particle size 50-100nm): 1-2 parts;

[0076] Defoamer: 0.2-0.5 parts;

[0077] The preparation method of the elastic primer is as follows: Trimethylolpropane triacrylate is added to the reaction vessel, heated to 45°C, and silane coupling agent is added under low-speed stirring (300 r / min) for 10 min; nano silica and defoamer are added, heated to 55°C, stirred at medium speed (800 r / min) for 25 min, cooled to room temperature, and filtered to obtain the elastic primer.

[0078] The preparation method of component A is as follows:

[0079] (1) Resin premixing: Methyl methacrylate, acrylic resin, n-butyl methacrylate and 2-ethylhexyl acrylate are added to the reactor, heated to 50-55℃, and stirred at low speed (300-400r / min) for 10-30 min until the acrylic resin is completely dissolved to obtain the first mixture;

[0080] (2) Modifier compounding: Add urethane acrylate and ultraviolet shielding agent to the first mixture, stir at medium speed (600-700 r / min) for 10-15 min, then add hydroxypropyl methylcellulose and dispersant, and continue stirring at medium speed for 15-20 min to obtain the second mixture;

[0081] (3) Reinforcement pretreatment: Add chopped glass fiber, nylon fiber, heavy calcium carbonate and composite inorganic filler to a dry powder mixer and stir at high speed (1000-1200r / min) for 5-15 min to obtain composite reinforcement;

[0082] (4) Composite molding: Add the composite reinforcement to the second mixture in batches, stir at medium speed (700-800r / min) for 10-20 min, then stir at low speed (300-400r / min) for 10-30 min, finally add the pigment, stir at low speed for 10-30 min, and filter to obtain component A.

[0083] The preparation method of component B is as follows:

[0084] Add dibutyl phthalate to a mixing tank, and add benzoyl peroxide and methyl ethyl ketone peroxide in sequence while stirring at low speed (300-400 r / min). Stir at low speed for 10-30 min until completely dissolved, then add cobalt naphthenate and zinc isooctanoate, and continue stirring at low speed for 10-30 min to obtain component B.

[0085] The preparation method of MMA polymer pavement ultrathin and ultrafast emergency repair material is as follows:

[0086] At the construction site, add component A and component B to the mixing container in the specified proportions, and mix at high speed (1500-2000 r / min) for 2-3 minutes with an electric mixer until evenly mixed and ready for use.

[0087] The construction method for applying the above-mentioned MMA polymer pavement ultra-thin and ultra-fast emergency repair material is as follows: Figure 1 As shown, it includes the following steps:

[0088] Step 1: Surface Preparation: Clean the surface to be repaired using a high-pressure water gun (pressure ≥15MPa) to remove loose dust and debris; for cracks and hollow areas, roughen the surface with an angle grinder, then blow away the dust with compressed air; the moisture content of the surface must be ≤8%.

[0089] Step 2: Primer Application: Apply the elastic primer evenly to the substrate using a roller or brush, with a coverage rate of 0.2-0.3 kg / m². 2 Cure at room temperature for 10-15 minutes, until it is no longer sticky to the touch;

[0090] Step 3: Repair Material Application: Apply the evenly mixed MMA polymer pavement ultra-thin and ultra-fast repair material to the primer surface using a scraper, with a coverage rate of 0.2-0.3 kg / m². 2 The thickness should be controlled between 1-10mm depending on the depth of the disease. Air bubbles should be removed during the scraping process, and the surface should be smoothed.

[0091] Step 4: Curing and Opening: In summer (25-35℃), cure for 15-20 minutes; in winter (-30-5℃), cure for 25-30 minutes. Once the surface hardness is ≥ Shore D75, traffic can be opened.

[0092] The repaired road surface structure is as follows Figure 2 As shown.

[0093] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0094] In this document, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0095] In this document, when values ​​are described as ranges, it should be understood that such disclosure includes disclosure of all possible subranges within that range, as well as the specific numerical values ​​falling within that range, regardless of whether the specific numerical value or specific subrange is explicitly specified.

[0096] In this article, the terms "multiple" or "more than" are used unless otherwise specified, referring to a quantity greater than or equal to 2. For example, "one or more" means one or more types.

[0097] In this document, the terms "preferred" and "more preferred" are used only to describe implementation methods or embodiments with better effects, and should be understood as not constituting a limitation on the scope of protection of this invention.

[0098] In this document, terms such as "further" are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this invention.

[0099] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0100] In this document, the term "about" means a specified value of + / - 10%, preferably + / - 5%, and more preferably + / - 1%.

[0101] In this article, the terms “include,” “including,” “have,” “contain,” etc., are all open-ended terms, meaning that they include but are not limited to.

[0102] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this invention.

[0103] In the following examples and comparative examples:

[0104] Methyl methacrylate is industrial grade with a purity ≥99%; acrylic resin has a molecular weight of 60,000; n-butyl methacrylate is industrial grade with a purity ≥98%; 2-ethylhexyl acrylate is industrial grade with a purity ≥98%; urethane acrylate has a solid content of 100%; hydroxypropyl methylcellulose has a viscosity of 4000 mPa·s; chopped glass fibers have a length of 3 mm and a diameter of 13 μm; nylon fibers have a length of 2 mm and a diameter of 15 μm; heavy calcium carbonate has a particle size of 250 mesh; composite inorganic fillers include silica sand with a particle size of 100 mesh, bauxite powder with a particle size of 120 mesh, corundum with a particle size of 180 mesh, and bentonite with a particle size of 250 mesh, in a mass ratio of 4:3. The mixture is composed of titanium dioxide (rutile type) and iron oxide pigment in a 2:1 ratio. The ultraviolet shielding agent is a mixture of titanium dioxide and cerium dioxide. The dispersant is a polycarboxylate dispersant. The silane coupling agent is KH-550. The particle size of the nano silica is 80nm. The defoamer is an organosilicon defoamer. The composition is as follows: benzoyl peroxide: 75% by mass; methyl ethyl ketone peroxide: 50% by mass; cobalt naphthenate: 10% by mass; zinc isooctanoate: 10% by mass.

[0105] The present invention will be described in detail below with reference to the embodiments.

[0106] Example 1

[0107] (1) Elastic primer (98.8 parts)

[0108] The following preparation method was used to prepare the following: 93 parts of trimethylolpropane triacrylate, 4 parts of KH-550, 1.5 parts of nano-silica, and 0.3 parts of defoamer.

[0109] Add trimethylolpropane triacrylate to the reactor, heat to 45°C, add silane coupling agent while stirring at low speed (400 r / min), and stir for 30 min; add nano silica and defoamer, heat to 55°C, stir at medium speed (800 r / min) for 20 min, cool to room temperature, and filter to obtain elastic primer.

[0110] (2) Component A (92.15 parts)

[0111] The following mixture was prepared according to the following method: 26 parts MMA, 13 parts PMMA, 7 parts BMA, 9 parts 2-EHA, 8 parts PUA, 2 parts HPMC, 23.5 parts composite reinforcement (1 part chopped glass fiber, 0.6 parts nylon fiber, 8 parts calcium carbonate, 13.9 parts composite inorganic filler), 3 parts pigment, 0.35 parts ultraviolet shielding agent (0.15 parts titanium dioxide, 0.2 parts cerium dioxide), and 0.3 parts dispersant.

[0112] (a) Resin premixing: MMA, PMMA, BMA and 2-EHA are added to the reactor, heated to 55°C, and stirred at low speed (300r / min) for 30min until the acrylic resin is completely dissolved to obtain the first mixture;

[0113] (b) Modifier compounding: PUA and UV shielding agent were added to the first mixture, and the mixture was stirred at medium speed (700 r / min) for 15 min. Then HPMC and dispersant were added, and the mixture was stirred for another 20 min to obtain the second mixture.

[0114] (3) Reinforcing pretreatment: Short glass fiber, nylon fiber, heavy calcium carbonate and composite inorganic filler are added to a dry powder mixer and stirred at high speed (1200r / min) for 15 min to obtain a composite reinforcing mixture;

[0115] (4) Composite molding: Add the composite reinforcement mixture to the second mixture in batches, stir at medium speed (800r / min) for 15min, then stir at low speed (300r / min) for 20min, finally add the pigment, stir for 10min, and filter to obtain component A.

[0116] (3) Component B (4 portions)

[0117] The following preparation method was used to prepare the following compound: 1.1 parts BPO, 0.8 parts MEKP, 0.7 parts cobalt naphthenate, 0.6 parts zinc isooctanoate, and 0.8 parts DBP.

[0118] Add DBP to the mixing tank, and add BPO and MEKP sequentially while stirring at low speed (300 r / min). Stir at low speed for 15 min until completely dissolved, then add cobalt naphthenate and zinc isooctanoate, and continue stirring at low speed for 10 min to obtain component B.

[0119] (4) Performance testing

[0120] The construction method is as follows, including the following steps:

[0121] Step 1: Surface Preparation: Clean the surface to be repaired using a high-pressure water gun (pressure ≥15MPa) to remove loose dust and debris; for cracks and hollow areas, roughen the surface with an angle grinder, then blow away the dust with compressed air; the moisture content of the surface must be ≤8%.

[0122] Step 2, Primer Application: Apply the elastic primer evenly to the substrate using a roller or brush, with a coverage rate of 0.2 kg / m². 2 Leave at room temperature for 10 minutes until it is no longer sticky to the touch;

[0123] Step 3, Repair material application: Apply the evenly mixed MMA polymer pavement ultra-thin and ultra-fast emergency repair material to the primer surface with a scraper. Control the thickness (1-10mm) according to the depth of the damage. Remove air bubbles during the scraping process and smooth the surface.

[0124] Step 4: Curing and opening: Cure at 25℃ for 18 minutes.

[0125] Performance testing: compressive strength is 58 MPa, flexural strength is 15 MPa, bond strength is 4.0 MPa, abrasion resistance is 0.012 g, and coefficient of friction is 0.88.

[0126] Example 2

[0127] (1) Elastic primer (99.5 parts)

[0128] 92 parts of trimethylolpropane triacrylate, 5 parts of KH-550, 2 parts of nano silica, and 0.5 parts of defoamer were prepared in the same manner as in Example 1.

[0129] (2) Component A (96.4 parts)

[0130] The following components were prepared: 28 parts MMA, 12 parts PMMA, 8 parts BMA, 10 parts 2-EHA, 9 parts PUA, 2.5 parts HPMC, 22.5 parts composite reinforcement (1.2 parts chopped glass fiber, 0.8 parts nylon fiber, 7 parts calcium carbonate, 13.5 parts composite inorganic filler), 3.5 parts pigment, 0.5 parts ultraviolet shielding agent (0.3 parts titanium dioxide, 0.2 parts cerium dioxide), and 0.4 parts dispersant. The preparation method was the same as in Example 1.

[0131] (3) Component B (4 portions)

[0132] The preparation method is the same as in Example 1, consisting of 1.2 parts BPO, 1.0 part MEKP, 0.8 parts cobalt naphthenate, 0.6 parts zinc isooctanoate, and 0.4 parts DBP.

[0133] (4) Performance testing

[0134] After construction according to the construction method in Example 1, cure at -20℃ for 20 minutes.

[0135] Performance testing: compressive strength is 55MPa, flexural strength is 12MPa, bond strength is 3.8MPa, abrasion resistance is 0.014g, and dry friction coefficient is 0.85.

[0136] Example 3

[0137] (1) Elastic primer (98.2 parts)

[0138] 94 parts of trimethylolpropane triacrylate, 3 parts of KH-550, 1 part of nano silica, and 0.2 parts of defoamer were prepared according to the same method as in Example 1.

[0139] (2) Component A (90.5 parts)

[0140] The following components were prepared: 25 parts MMA, 15 parts PMMA, 6 parts BMA, 8 parts 2-EHA, 7 parts PUA, 1.5 parts HPMC, 25 parts composite reinforcement (1.2 parts chopped glass fiber, 0.8 parts nylon fiber, 9 parts calcium carbonate, 14 parts composite inorganic filler), 2.5 parts pigment, 0.3 parts ultraviolet shielding agent (0.2 parts titanium dioxide, 0.1 parts cerium dioxide), and 0.2 parts dispersant. The preparation method was the same as in Example 1.

[0141] (3) Component B (3.4 parts)

[0142] The preparation method is the same as in Example 1, consisting of 1 part BPO, 0.8 parts MEKP, 0.6 parts cobalt naphthenate, 0.4 parts zinc isooctanoate, and 0.6 parts DBP.

[0143] (4) Performance testing

[0144] After construction according to the construction method in Example 1, cure at -20℃ for 23 minutes.

[0145] Performance testing: compressive strength is 52MPa, flexural strength is 10MPa, bond strength is 3.5MPa, abrasion resistance is 0.17g, and dry friction coefficient is 0.82.

[0146] Comparative Example 1

[0147] The formulation consists of the following components: Component A contains 30 parts MMA, 10 parts acrylic resin, 5 parts BMA, 15 parts 2-EHA, etc., and Component B contains 2 parts BPO and 1 part cobalt naphthenate.

[0148] Comparative Example 2

[0149] (1) Elastic primer (100 parts): 93 parts of trimethylolpropane triacrylate, 1.5 parts of nano silica, and 0.3 parts of silicone defoamer (KH-550 silane coupling agent is removed, and the remaining components and parts are the same as in Example 1);

[0150] (2) Components A and B: completely consistent with Example 1;

[0151] (3) Performance test: The construction was carried out at 25℃ according to the construction method of Example 1, and the performance was tested after curing for 18 min. The performance test results are shown in Table 1.

[0152] Comparative Example 3

[0153] (1) Elastic primer: completely consistent with Example 1;

[0154] (2) Component A: completely identical to that in Example 1;

[0155] (3) Component B (10 parts): 1.1 parts benzoyl peroxide (BPO), 0.9 parts MEKP, 0.7 parts cobalt naphthenate (single accelerator, zinc isooctanoate is omitted), 6.8 parts dibutyl phthalate (DBP), prepared in the same way as in Example 1;

[0156] (4) Performance test: The construction method of Example 1 was applied at 25℃ and the performance was tested after curing for 25 min (the curing speed of a single system is slow, so the curing time was extended to the same as that of the original comparative example 1). The performance test results are shown in Table 1.

[0157] Comparative Example 4

[0158] (1) Elastic primer: completely consistent with Example 1;

[0159] (2) Component A: completely identical to that in Example 1;

[0160] (3) Component B (10 parts): 1.1 parts of benzoyl peroxide (BPO) (single initiator, MEKP omitted), 0.7 parts of cobalt naphthenate, 0.5 parts of zinc isooctanoate, and 6.8 parts of dibutyl phthalate (DBP). The preparation method is the same as in Example 1.

[0161] (4) Performance test: The construction method of Example 1 was carried out at 25℃ and the performance was tested after curing for 25 minutes (the curing speed of a single system is slow, so the curing time is extended).

[0162] The performance test results are shown in Table 1.

[0163] Comparative Example 5

[0164] (1) Elastic primer: completely consistent with Example 1;

[0165] (2) Component A: completely identical to that in Example 1;

[0166] (3) Component B (10 parts): 1.1 parts BPO, 0.9 parts MEKP, 0.7 parts cobalt naphthenate (single accelerator, zinc isooctanoate is omitted), 6.8 parts dibutyl phthalate (DBP), prepared in the same way as in Example 1;

[0167] (4) Performance test: The construction method of Example 1 was applied at 25℃ and the performance was tested after curing for 25 min (the curing speed of a single system is slow, so the curing time was extended to the same as that of the original comparative example 1). The performance test results are shown in Table 1.

[0168] The detection performance results of the above embodiments and comparative examples are shown in the table below:

[0169] Table 1 Comparison of test results

[0170] project Example 1 (25℃) Example 2 (-20℃) Example 3 (-20℃) Comparative Example 1 (25℃) Comparative Example 2 (25℃) Comparative Example 3 (25℃) Comparative Example 4 (25℃) Comparative Example 5 (25℃) Standard requirements Curing open time (min) 18 20 23 25 18 25 28 30 ≤30 Compressive strength (MPa) 58 55 52 45 46 45 48 42 ≥50 Flexural strength (MPa) 15 12 10 8 9 8 8.5 7 ≥10 Bond strength (MPa) 4.0 3.8 3.5 2.8 2.5 2,5 2.3 2.7 ≥3.5 Abrasion resistance (g) 0.012 0.014 0.17 0.028 0.012 0.31 0.25 0.032 ≤0.030 Aging resistance (400h) No cracks, no powdering No cracks, no powdering No cracks, no powdering Slight powdering No cracks, edge delamination Minor cracks, powdering Minor cracks, powdering Minor cracks, powdering No cracks, no powdering Low-temperature curing property (-20℃) It can be cured and its strength meets the requirements. It can be cured and its strength meets the requirements. It can be cured and its strength meets the requirements. Unable to cure Curable, adhesive failure Completely unable to cure Completely unable to cure Completely unable to cure It can be cured and its strength meets the requirements. Coefficient of friction (dry friction) 0.88 0.85 0.82 0.76 0.72 0.80 0.65 0.75 0.55

[0171] The test results in Table 1 show that:

[0172] (1) Comparison of Comparative Example 2 and Example 1: After removing the silane coupling agent, the elastic primer lost its chemical bonding with the substrate and repair material. Although the curing time did not change, the bonding strength was significantly lower than the standard requirements, and edge delamination occurred later. This proves that the synergistic effect of trimethylolpropane triacrylate and silane coupling agent is the core of improving bonding performance and forming a strong bonding system, and neither can be omitted.

[0173] (2) Comparison of Comparative Example 3 and Example 1: The single initiator-promoter system not only has a slow curing speed and a comprehensive decline in mechanical properties, but also has wear resistance that exceeds the standard requirements. Furthermore, it cannot be cured at low temperatures. This proves that the combination of the BPO / MEKP composite initiator and the cobalt naphthenate / zinc isooctanoate composite accelerator of this invention is the key to achieving wide temperature range construction, ultra-fast curing and excellent mechanical properties. A single system cannot solve the problems of insufficient low-temperature activity and easy runaway at high temperatures of traditional MMA materials.

[0174] (3) Comparative Example 4 (without MEKP, single initiator) showed further slow curing, insufficient strength and adhesion, excessive wear resistance, and failure to cure at low temperature, proving that the composite initiator can improve initiation efficiency and low-temperature activity.

[0175] (4) The performance of Comparative Example 5 (single initiator + single accelerator) deteriorated across the board. The curing time reached the upper limit, the compressive strength was only 42MPa, the flexural strength was 7MPa, the adhesion was 2.7MPa, the wear resistance was not up to standard, and it completely failed at low temperature. This proves that the composite initiator and accelerator system of the present invention has a synergistic effect and is indispensable. The use of single initiator and single accelerator increased the curing time, and it could not be cured at low temperature. The compressive strength, flexural strength, adhesion and other properties were significantly reduced compared with the performance indicators of Examples 1 and 2.

[0176] In summary, none of the comparative examples achieved the comprehensive performance of the embodiments of this invention, and some indicators did not meet the standard requirements. This invention overcomes the long-standing technical defects in the industry, such as inability to apply at low temperatures, easy delamination of thin layers, slow curing, and low strength, through three major innovations: composite initiation, synergistic enhancement, and interfacial bonding. The economic and social benefits are significantly improved. The readily available raw materials, stable process, and simple construction enable rapid repair of ultra-thin layers, reducing costs by more than 40%. It can be widely applied to emergency repairs of airport, municipal pavement, highway, and bridge pavement. It represents a technological breakthrough in ultra-thin and ultra-fast pavement repair materials in terms of wide temperature range, ultra-fast curing, high strength, and high durability, demonstrating significant progress compared to existing technologies.

[0177] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thin and fast-response MMA polymer pavement repair material, characterized in that: The material comprises component A and component B, wherein: Component A comprises the following components in parts by weight: 25-28 parts methyl methacrylate, 12-15 parts acrylic resin, 6-8 parts n-butyl methacrylate, 8-10 parts 2-ethylhexyl acrylate, 7-9 parts urethane acrylate, 1.5-2.5 parts hydroxypropyl methylcellulose, 22-25 parts composite reinforcement, 2.5-3.5 parts pigment, 0.3-0.5 parts ultraviolet shielding agent, and 0.2-0.4 parts dispersant; Component B comprises the following components in parts by weight: 1.0-1.2 parts benzoyl peroxide, 0.8-1.0 parts methyl ethyl ketone peroxide, 0.6-0.8 parts cobalt naphthenate, 0.4-0.6 parts zinc isooctanoate, and 0.4-0.8 parts dibutyl phthalate.

2. The MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 1, characterized in that: The mass ratio of component A to component B is 100:(3.8-4.3).

3. The MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 1, characterized in that: The acrylic resin is polymethyl methacrylate with a molecular weight of 50,000-80,000.

4. The MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 1, characterized in that: The ultraviolet shielding agent includes one or a mixture of two of titanium dioxide, cerium dioxide, and zirconium dioxide; Preferably, the dispersant is a polycarboxylate dispersant.

5. The MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 1, characterized in that: The composite reinforcement comprises the following components in parts by weight: 0.8-1.2 parts chopped glass fiber, 0.5-0.8 parts nylon fiber, 7-9 parts heavy calcium carbonate, and 13-14 parts composite inorganic filler; More preferably, the chopped glass fibers are 3-5 mm long and 10-15 μm in diameter, the nylon fibers are 2-3 mm long and 8-12 μm in diameter, and the heavy calcium carbonate has a particle size of 200-300 mesh. Preferably, the composite inorganic filler comprises silica sand, bauxite powder, corundum, and bentonite in a mass ratio of 4:3:2:1; More preferably, the silica sand has a particle size of 80-100 mesh, the bauxite powder has a particle size of 100-150 mesh, the corundum has a particle size of 150-200 mesh, and the bentonite has a particle size of 200-300 mesh.

6. The MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 1, characterized in that: The pigment comprises rutile titanium dioxide and iron oxide pigment in a mass ratio of 3:

1.

7. The preparation method of the MMA polymer pavement ultrathin and ultrafast emergency repair material according to any one of claims 1-6, characterized in that: The preparation method includes the steps of preparing component A and component B respectively, wherein the preparation of component A is as follows: S11: Add methyl methacrylate, acrylic resin, n-butyl methacrylate, and 2-ethylhexyl acrylate to a reaction vessel, heat to 50-55℃, and stir at low speed until the acrylic resin is completely dissolved to obtain the first mixture; S12: Add urethane acrylate and UV shielding agent to the first mixture, stir at medium speed, then add hydroxypropyl methylcellulose and dispersant, and continue stirring at medium speed to obtain the second mixture; S13: Short-cut glass fibers, nylon fibers, heavy calcium carbonate and composite inorganic fillers are added to a dry powder mixer and stirred at high speed to obtain a composite reinforcement. S14: Add the composite reinforcement to the second mixture in batches, stir at medium speed first and then at low speed, and finally add the pigment. After stirring, filter to obtain component A. The preparation of component B is as follows: Dibutyl phthalate was added sequentially to benzoyl peroxide and methyl ethyl ketone peroxide under low-speed stirring until completely dissolved. Then cobalt naphthenate and zinc isooctanoate were added, and stirring was continued to obtain component B.

8. The preparation method of the MMA polymer pavement ultrathin and ultrafast emergency repair material according to claim 7, characterized in that: The low-speed stirring is performed at a speed of 300-400 r / min for 10-30 min; the medium-speed stirring is performed at a speed of 600-800 r / min for 10-20 min; and the high-speed stirring is performed at a speed of 1000-1200 r / min for 5-15 min.

9. A construction method for pavement repair using the MMA polymer pavement ultrathin and ultrafast emergency repair material as described in claims 1-7, characterized in that: The construction method includes the following steps: Step 1: Surface preparation: Clean the surface to be repaired and ensure the moisture content is ≤8%; Step 2, Primer Application: Apply the elastic primer to the substrate at a rate of 0.2-0.3 kg / m². 2 Curing at room temperature for 10-15 minutes; Step 3: Repair Material Application: Mix component A and component B of the MMA polymer pavement ultra-thin and ultra-fast emergency repair material according to any one of claims 1-7 until homogeneous. Apply the homogeneous MMA polymer pavement ultra-thin and ultra-fast emergency repair material onto the surface of the elastic primer, with a coating amount of 0.2-0.3 kg / m². 2 The thickness should be controlled between 1-10mm; Step 4: Curing and Opening: Cure at an ambient temperature of 25-35℃ for 15-20 minutes, or at an ambient temperature of -30-5℃ for 25-30 minutes. Once the surface hardness is ≥ Shore D75, traffic can be opened.

10. The construction method according to claim 9, characterized in that: The elastic primer comprises the following components in parts by weight: 92-94 parts trimethylolpropane triacrylate, 3-5 parts silane coupling agent, 1-2 parts nano silica, and 0.2-0.5 parts defoamer. Preferably, the silane coupling agent is one or a mixture of two or more of the following: KH-550, titanate coupling agent TL808, aluminate coupling agent 6253, zirconate coupling agent 108, and organochromium coupling agent YM-202. Preferably, the particle size of the nano-silica is 50-100 nm; Preferably, the defoamer is an organosilicon defoamer; Preferably, the elastic primer is prepared by adding trimethylolpropane triacrylate to a reaction vessel, heating to 40-45°C, adding a silane coupling agent under low-speed stirring, and stirring for 5-10 minutes; adding nano-silica and defoamer, heating to 50-55°C, stirring at medium speed for 20-25 minutes, cooling to room temperature, and filtering to obtain the elastic primer.

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