Modified acrylate resin, method for preparing the same, and interface agent for ballastless track joint sealant

Abstract

The application discloses a modified acrylate resin, a preparation method thereof and an interface agent for ballastless track caulking glue. Alkyl methacrylate monomers, alkyl acrylate monomers, styrene, fluorine-containing vinyl monomers, isocyanate monomers, an initiator, a molecular weight regulator and a secondary amino silane are prepared into the modified acrylate resin, and then the modified acrylate resin, an epoxy silane coupling agent, a solvent, a water removing agent and a catalyst are prepared into the interface agent for the ballastless track caulking glue. The film forming material uses the modified acrylate resin, the structure of which contains fluorine, a benzene ring, a urea group and an acrylic acid structure, so that the film forming material has high adhesion to concrete, and is good in water resistance, alkali resistance and weather resistance.

Description

Technical Field

[0001] This invention belongs to the field of rail transit materials technology, specifically relating to a modified acrylic resin and its preparation method, and a high water-resistant interface agent for ballastless track caulking materials. Background Technology

[0002] With the vigorous development of high-speed railway construction in my country, ballastless track has become the mainstream choice for high-speed railway line laying due to its advantages such as high smoothness and low maintenance. In ballastless track systems, joint sealant is used to fill gaps to prevent track erosion by rainwater. This sealant is subjected to long-term exposure to rainwater, concrete efflorescence, and UV aging under sunlight. The long-term adhesion of the sealant affects the safety of the ballastless track system. The interface agent, acting as a "bridge" connecting the track base and the sealant material, primarily improves the adhesion of the sealant to the concrete surface, preventing detachment due to rainwater erosion and concrete efflorescence. Its performance plays a decisive role in the sealant application. Therefore, when verifying whether the performance of the sealant and interface agent used in ballastless track meets the safety requirements of the ballastless track system, performance tests should be conducted focusing on water resistance (immersion test), alkali resistance (alkali treatment), and weather resistance (thermal aging and UV aging) to comprehensively verify the anti-detachment ability of the interface agent and sealant under complex environments.

[0003] Traditional interface agents mainly fall into three categories: epoxy, polyurethane, and silicone. While epoxy resin-based agents offer high bonding strength and good water resistance, they are often two-component, making them inconvenient to use. Polyurethane-based interface agents suffer from poor water resistance and are prone to bubbling. Silicone-based interface agents have lower strength and do not meet current requirements. With advancements in technology and increasingly stringent usage requirements, modified composites with different polymers are an effective way to improve performance. For example, patent CN 110698965 A discloses a cement interface agent that primarily uses epoxy-modified polyurethane as the film-forming material, overcoming the poor water resistance of traditional polyurethane. However, it still suffers from poor storage stability and a short shelf life, and is prone to bubbling on damp surfaces, affecting its performance.

[0004] Acrylic resin has excellent weather resistance and can maintain stable performance even under long-term ultraviolet radiation and harsh outdoor climates; it has good corrosion resistance and can resist chemicals such as acids and alkalis; however, its high temperature resistance is not strong and its bonding strength to concrete substrates is not high. Summary of the Invention

[0005] In view of this, the present invention aims to provide a modified acrylic resin and its preparation method, and a novel interface agent for ballastless track caulking. The interface agent uses silane and fluorine-containing monomer-modified acrylic resin as the film-forming material, which not only has high-strength adhesion to concrete, but also has good water resistance, alkali resistance, high temperature resistance and weather resistance.

[0006] In a first aspect, the present invention provides an interface agent for ballastless track caulking adhesive, wherein the amount of each component of the raw material is calculated according to parts by weight, and the raw material includes the following components:

[0007] Modified acrylic resin: 30-40 parts;

[0008] Solvent: 30-40 parts;

[0009] Epoxy silane coupling agent: 2-5 parts;

[0010] Dehydrating agent: 1-2 parts;

[0011] Catalyst: 0.5–1 part;

[0012] The modified acrylic resin is obtained by free radical polymerization of (meth)acrylate alkyl ester monomers, styrene, fluorinated monomers, and isocyanate monomers under an initiator, followed by reaction with aminosilane.

[0013] The solvent is one or more of butyl acetate, ethyl acetate, dichloroethane, toluene, and xylene, with ethyl acetate being preferred.

[0014] The epoxy silane coupling agent is γ-glycidoxypropyltrimethoxysilane or γ-glycidoxypropyltriethoxysilane, with γ-glycidoxypropyltrimethoxysilane being preferred.

[0015] The dehydrating agent is one of triethyl orthoformate, vinyltrimethoxysilane, and vinyltriethoxysilane, with vinyltrimethoxysilane being preferred.

[0016] The catalyst is one or two of dibutyltin dilaurate and stannous octoate, with dibutyltin dilaurate being preferred.

[0017] Secondly, the present invention provides a modified acrylate resin, wherein the amount of each component in the raw materials is calculated according to parts by weight, and the raw materials include the following components:

[0018] 30-40 parts of alkyl methacrylate monomers;

[0019] 6-8 parts of alkyl acrylate monomers;

[0020] 6-8 parts styrene;

[0021] 2 to 4 parts of fluorinated vinyl monomers;

[0022] 2-4 parts isocyanate monomer,

[0023] 5–9 parts secondary aminosilane;

[0024] 0.5 to 1 part initiator;

[0025] 0.3–0.6 parts of molecular weight regulator;

[0026] 60-80 parts solvent;

[0027] The preparation process of modified acrylate resin is as follows: All monomers (including alkyl methacrylate monomers, alkyl acrylate monomers, styrene, fluorinated vinyl monomers, isocyanate monomers), initiators, and molecular weight regulators are mixed evenly to obtain a mixture. First, a portion of the mixture is added to a reaction vessel, then all solvents are added, and the mixture is heated to 80-90°C and reacted for 30-60 minutes. The remaining mixture is then added dropwise, and the addition is completed within 2 hours. The reaction is maintained at this temperature for at least 2 hours. The temperature is then lowered to below 40°C, and secondary aminosilane is added dropwise to react with the isocyanate groups therein. After the addition is completed, the reaction continues for at least 30 minutes.

[0028] When adding the mixture to the reactor, the first portion of the mixture added to the reactor can be about one-third of the total mass of the mixture.

[0029] The modified acrylic resin provided by this invention has the following reaction formula:

[0030]

[0031] R1 is selected from any one of -CH3, -CH2CH3, -C4H9, and -CH2CH(C2H5)C4H9;

[0032] R2 is selected from any one of -CH3, -C4H9, and -CH2CH(C2H5)C4H9;

[0033] R3 is selected from either -CH2CF3 or -CH2CF2CHFCF3;

[0034] R4 is selected from either -H or -CH3;

[0035] R5 is selected from -C3H6Si(OCH3)3, -C6H 11 Any one of -C6H5;

[0036] Where a is any integer from 10 to 100, b is any integer from 3 to 20, c is any integer from 3 to 20, d is any integer from 1 to 10, and e is any integer from 1 to 10.

[0037] Preferably, the number average molecular weight of this modified acrylate resin is 2000 to 50000.

[0038] In the raw materials of the modified acrylate resin, the alkyl methacrylate monomers include one or two of methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate, with methyl methacrylate being preferred.

[0039] The alkyl acrylate monomer is one or two of methyl acrylate, butyl acrylate, and isooctyl acrylate, with isooctyl acrylate being preferred.

[0040] The fluorinated vinyl monomer is one or both of trifluoroethyl methacrylate and hexafluorobutyl acrylate, with trifluoroethyl methacrylate being preferred.

[0041] The isocyanate monomer is one or both of isocyanate methacrylate and isocyanate acrylate, with isocyanate methacrylate being preferred.

[0042] The secondary aminosilane is one or two of N-phenyl–3-aminopropyltrimethoxysilane, bis(3-trimethoxysilylpropyl)amine, and 3-(N-cyclohexylamino)-propyltrimethoxysilane, with bis(3-trimethoxysilylpropyl)amine being preferred.

[0043] The initiator is one or two of benzoyl peroxide and azobisisobutyronitrile, with azobisisobutyronitrile being preferred.

[0044] The molecular weight regulator is one or two of 2,4-diphenyl-4-methyl-1-pentene and dodecyl mercaptan, with 2,4-diphenyl-4-methyl-1-pentene being preferred.

[0045] The solvent is one or two of ethyl acetate, butyl acetate, toluene, and xylene, with butyl acetate being preferred.

[0046] This invention provides an interface agent for ballastless track caulking, characterized in that the film-forming material uses modified acrylic resin. The modified acrylic resin is produced by free radical polymerization of alkyl methacrylate monomers, styrene, alkyl acrylate monomers, fluorinated monomers, and isocyanate monomers under an initiator, and then by reacting isocyanate groups with amino groups to generate urea groups that are attached to aminosilane. Among them, alkyl methacrylate monomers and styrene provide good cohesive force. Styrene has benzene rings, which can improve heat resistance to a certain extent. Alkyl acrylate monomers provide a certain degree of flexibility. Fluorinated monomers make the surface energy of the interface agent low, which can play a good waterproof role, but will also reduce the adhesion at the interface. Silane coupling agent can not only enhance the adhesion and make up for the adverse effect of fluorinated monomers on adhesion, but also improve the weather resistance of the interface agent. The urea group generated by the reaction of aminosilane and isocyanate group has multiple functions: (1) it can enhance the surface energy of the interface agent and further make up for the adverse effect of fluorinated monomers on adhesion; (2) it can increase the cohesive force of the interface agent itself; (3) it can promote the hydrolysis of silane to a certain extent. The combined effect of the above factors gives the interface agent high adhesive strength.

[0047] In summary, this invention not only has high-strength adhesion to concrete, but also exhibits good water resistance, alkali resistance, and weather resistance. Its curing method is single-component moisture curing, and it can be surface-dried in about 10 minutes after being brushed onto the concrete. The construction operation is simple and convenient, and it has a promising application prospect. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] Example 1

[0050] Preparation of modified acrylic resin:

[0051] 30 parts by weight of methyl methacrylate, 6 parts by weight of isooctyl acrylate, 6 parts by weight of styrene, 2 parts by weight of trifluoroethyl methacrylate, 2 parts by weight of isocyanate ethyl methacrylate, 0.5 parts by weight of azobisisobutyronitrile, and 0.3 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 60 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 80°C. After the temperature of the liquid in the reaction vessel reached 80°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 5 parts by weight of bis(3-trimethoxysilylpropyl)amine were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0052] Preparation of interfacial agents:

[0053] An interface agent was prepared by mixing 30 parts by weight of the above-mentioned modified acrylic resin, 30 parts by weight of ethyl acetate, 2 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1 part by weight of vinyltrimethoxysilane, and 0.5 parts by weight of dibutyltin dilaurate.

[0054] Example 2

[0055] Preparation of modified acrylic resin:

[0056] 40 parts by weight of methyl methacrylate, 8 parts by weight of isooctyl acrylate, 8 parts by weight of styrene, 4 parts by weight of trifluoroethyl methacrylate, 4 parts by weight of isocyanate ethyl methacrylate, 1 part by weight of azobisisobutyronitrile, and 0.6 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 80 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 90°C. After the temperature of the liquid in the reaction vessel reached 90°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 9 parts by weight of bis(3-trimethoxysilylpropyl)amine were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0057] Preparation of interfacial agents:

[0058] An interface agent was prepared by mixing 40 parts by weight of the above-mentioned modified acrylic resin, 40 parts by weight of ethyl acetate, 5 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 2 parts by weight of vinyltrimethoxysilane, and 1 part by weight of dibutyltin dilaurate.

[0059] Example 3

[0060] Preparation of modified acrylic resin:

[0061] 35 parts by weight of methyl methacrylate, 7 parts by weight of isooctyl acrylate, 7 parts by weight of styrene, 3 parts by weight of trifluoroethyl methacrylate, 2 parts by weight of isocyanate ethyl methacrylate, 0.7 parts by weight of azobisisobutyronitrile, and 0.5 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 70 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 85°C. After the temperature of the liquid in the reaction vessel reached 85°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 7 parts by weight of bis(3-trimethoxysilylpropyl)amine were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0062] Preparation of interfacial agents:

[0063] An interface agent was prepared by mixing 35 parts by weight of the above-mentioned modified acrylic resin, 35 parts by weight of ethyl acetate, 4 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1.5 parts by weight of vinyltrimethoxysilane, and 0.7 parts by weight of dibutyltin dilaurate.

[0064] Example 4

[0065] Preparation of modified acrylic resin:

[0066] 35 parts by weight of ethyl methacrylate, 7 parts by weight of butyl acrylate, 7 parts by weight of styrene, 3 parts by weight of hexafluorobutyl acrylate, 2 parts by weight of isocyanate ethyl methacrylate, 0.7 parts by weight of azobisisobutyronitrile, and 0.5 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 70 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 85°C. After the temperature of the liquid in the reaction vessel reached 85°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 7 parts by weight of bis(3-trimethoxysilylpropyl)amine were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0067] Preparation of interfacial agents:

[0068] An interface agent was prepared by mixing 35 parts by weight of the above-mentioned modified acrylic resin, 35 parts by weight of butyl acetate, 4 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1.5 parts by weight of vinyltriethoxysilane, and 0.7 parts by weight of dibutyltin dilaurate.

[0069] Example 5

[0070] Preparation of modified acrylic resin:

[0071] 36 parts by weight of methyl methacrylate, 7 parts by weight of isooctyl acrylate, 8 parts by weight of styrene, 3 parts by weight of trifluoroethyl methacrylate, 2 parts by weight of isocyanate, 0.6 parts by weight of azobisisobutyronitrile, and 0.4 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 70 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 85°C. After the temperature of the liquid in the reaction vessel reached 85°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 7 parts by weight of N-phenyl–3-aminopropyltrimethoxysilane were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0072] Preparation of interfacial agents:

[0073] An interface agent was prepared by mixing 35 parts by weight of the above-mentioned modified acrylic resin, 35 parts by weight of ethyl acetate, 4 parts by weight of γ-glycidyl etheroxypropyltriethoxysilane, 1.5 parts by weight of vinyltrimethoxysilane, and 0.6 parts by weight of stannous octoate evenly.

[0074] Comparative Example 1

[0075] Preparation of modified acrylic resin (without using fluorinated vinyl monomers):

[0076] 30 parts by weight of methyl methacrylate, 6 parts by weight of isooctyl acrylate, 6 parts by weight of styrene, 2 parts by weight of isocyanate methacrylate, 0.5 parts by weight of azobisisobutyronitrile, and 0.3 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 60 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 80°C. After the temperature of the liquid in the reaction vessel reached 80°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours. The temperature was then lowered to 40°C, and 5 parts by weight of bis(3-trimethoxysilylpropyl)amine were added dropwise. The reaction was maintained at this temperature for 30 minutes to obtain the modified acrylic resin.

[0077] Preparation of interfacial agents:

[0078] An interface agent was prepared by mixing 30 parts by weight of the above-mentioned modified acrylic resin, 30 parts by weight of ethyl acetate, 2 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1 part by weight of vinyltrimethoxysilane, and 0.5 parts by weight of dibutyltin dilaurate.

[0079] Comparative Example 2

[0080] Preparation of modified acrylic resin (using vinylsilane instead of secondary aminosilane and isocyanate monomers):

[0081] 30 parts by weight of methyl methacrylate, 6 parts by weight of isooctyl acrylate, 6 parts by weight of styrene, 2 parts by weight of trifluoroethyl methacrylate, 7 parts by weight of 3-methacryloyloxypropyltrimethoxysilane, 0.5 parts by weight of azobisisobutyronitrile, and 0.3 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 60 parts by weight of butyl acetate were poured into a reaction vessel, and one-third of the mixed monomers were added. The vessel was evacuated and purged with nitrogen. The temperature was set to 80°C. After the temperature of the liquid in the reaction vessel reached 80°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours to obtain the modified acrylic resin.

[0082] Preparation of interfacial agents:

[0083] An interface agent was prepared by mixing 30 parts by weight of the above-mentioned modified acrylic resin, 30 parts by weight of ethyl acetate, 2 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1 part by weight of vinyltrimethoxysilane, and 0.5 parts by weight of dibutyltin dilaurate.

[0084] Comparative Example 3

[0085] Preparation of modified acrylic resin (without secondary aminosilane):

[0086] 30 parts by weight of methyl methacrylate, 6 parts by weight of isooctyl acrylate, 6 parts by weight of styrene, 2 parts by weight of trifluoroethyl methacrylate, 2 parts by weight of isocyanate ethyl methacrylate, 0.5 parts by weight of azobisisobutyronitrile, and 0.3 parts by weight of 2,4-diphenyl-4-methyl-1-pentene were stirred and mixed evenly. 60 parts by weight of butyl acetate were poured into a reactor, and one-third of the mixed monomers were added. The reactor was evacuated and purged with nitrogen. The temperature was set to 80°C. After the temperature of the liquid in the reactor reached 80°C, the reaction was carried out for 30 minutes. Then, the remaining monomers were added dropwise over a period of 2 hours. After the addition was completed, the reaction was carried out for 2 hours to obtain the modified acrylic resin.

[0087] Preparation of interfacial agents:

[0088] An interface agent was prepared by mixing 30 parts by weight of the above-mentioned modified acrylic resin, 30 parts by weight of ethyl acetate, 2 parts by weight of γ-glycidyl etheroxypropyltrimethoxysilane, 1 part by weight of vinyltrimethoxysilane, and 0.5 parts by weight of dibutyltin dilaurate.

[0089] Performance tests for each embodiment:

[0090] The interface agents prepared in the above embodiments were tested according to the relevant requirements of "TJ / GW 119-2013 Provisional Technical Conditions for Joint Sealing Materials for Ballastless Track of High-Speed ​​Railway". The surface drying time, actual drying time, bonding strength, heat treatment, alkali treatment and water immersion were performed in accordance with GB / T 16777-2008, the bonding area with concrete was performed in accordance with GB / T 13477, and the ultraviolet aging treatment was performed in accordance with GB / T 14522.

[0091]

[0092] The test results show that, compared with Example 1, Comparative Example 1 did not add fluorinated monomers, resulting in a significant deviation in water resistance. After adding fluorinated monomers, its water resistance was significantly improved, and the area of ​​bond failure was 0 after immersion in water according to the standard. Comparative Example 2 used vinyl silane acryloyloxypropyltrimethoxysilane instead of secondary aminosilane and isocyanate monomers, and directly used vinyl-containing silane coupling agent to connect to the acrylate backbone, with no urea structure in the molecular chain. Comparative Example 3 used isocyanate monomers, but did not add aminosilane. The bond strength of both comparative documents 2 and 3 to concrete substrates did not reach 3 MPa (the required index of "TJ / GW 119-2013 Provisional Technical Conditions for Jointing Materials of Ballastless Track for High-Speed ​​Railway"). The bond failure area of ​​Comparative Example 2 increased after immersion in water and alkali treatment, and Comparative Example 3 increased after immersion in water, alkali treatment, and UV aging. This shows that using isocyanate monomers to react with aminosilanes to connect to the acrylate backbone can improve its interfacial bond strength.

[0093] Although the invention has been described herein with reference to illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of this disclosure. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A modified acrylate resin, characterized in that, The raw materials comprise the following components by weight: 30-40 parts of alkyl methacrylate monomers; 6-8 parts of alkyl acrylate monomers; 6-8 parts styrene; 2 to 4 parts of fluorinated vinyl monomers; 2-4 parts isocyanate monomer, 5–9 parts secondary aminosilane; 0.5 to 1 part initiator; 0.3–0.6 parts of molecular weight regulator; 60-80 parts solvent; The isocyanate monomer is one or both of isocyanate methacrylate and isocyanate acrylate; The secondary aminosilane is one or two of N-phenyl–3-aminopropyltrimethoxysilane, bis(3-trimethoxysilylpropyl)amine, and 3-(N-cyclohexylamino)-propyltrimethoxysilane; The preparation method of modified acrylate resin includes the following steps: alkyl methacrylate monomers, alkyl acrylate monomers, styrene, fluorinated vinyl monomers, isocyanate monomers, initiators, and molecular weight regulators are mixed evenly to obtain a mixture. A portion of the mixture is first added to a reaction vessel, all solvents are added, the mixture is heated to react, the remaining mixture is added dropwise, the mixture is kept at a constant temperature, the temperature is lowered to below 40°C, and secondary aminosilane is added dropwise to react with the isocyanate groups therein to obtain the resin.

2. The modified acrylate resin according to claim 1, characterized in that, The fluorinated vinyl monomer is one or both of trifluoroethyl methacrylate and hexafluorobutyl acrylate.

3. The modified acrylate resin according to claim 1, characterized in that, The alkyl methacrylate monomers include one or two of methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate; The alkyl acrylate monomer is one or two of methyl acrylate, butyl acrylate, and isooctyl acrylate; The initiator is one or both of benzoyl peroxide and azobisisobutyronitrile; The molecular weight regulator is one or both of 2,4-diphenyl-4-methyl-1-pentene and dodecyl mercaptan. The solvent is one or two of ethyl acetate, butyl acetate, toluene, and xylene.

4. The modified acrylate resin according to any one of claims 1 to 3, characterized in that, The heating reaction conditions are as follows: heat to 80-90℃ and react for 30-60 minutes, then start adding the remaining mixture dropwise, and complete the addition within 2 hours; the heat preservation reaction time is as follows: heat preservation reaction for at least 2 hours; after the addition of secondary aminosilane is completed, continue the reaction for at least 30 minutes.

5. A modified acrylate resin, characterized in that, It has the following structural formula: ； R1 is selected from any one of -CH3, -CH2CH3, -C4H9, and -CH2CH(C2H5)C4H9; R2 is selected from any one of -CH3, -C4H9, and -CH2CH(C2H5)C4H9; R3 is selected from either -CH2CF3 or -CH2CF2CHFCF3; R4 is selected from either -H or -CH3; R5 is selected from -C3H6Si(OCH3)3, -C6H 11 Any one of -C6H5; Where a is any integer from 10 to 100, b is any integer from 3 to 20, c is any integer from 3 to 20, d is any integer from 1 to 10, and e is any integer from 1 to 10.

6. An interface agent for caulking of ballastless tracks, characterized in that, The raw materials comprise the following components by weight: 30-40 parts of the modified acrylate resin according to any one of claims 1 to 5; Solvent: 30-40 parts; Epoxy silane coupling agent: 2-5 parts; Dehydrating agent: 1-2 parts; Catalyst: 0.5 to 1 part.

7. The interface agent for ballastless track joint sealant according to claim 6, characterized in that, The epoxy silane coupling agent is one or both of γ-glycidoxypropyltrimethoxysilane and γ-glycidoxypropyltriethoxysilane.

8. The interface agent for ballastless track joint sealant according to claim 7, characterized in that, The solvent is one or more of butyl acetate, ethyl acetate, dichloroethane, toluene, and xylene; the dehydrating agent is one of triethyl orthoformate, vinyltrimethoxysilane, and vinyltriethoxysilane; and the catalyst is one or two of dibutyltin dilaurate and stannous octoate.

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