High insulating elastic isolation material for rail transit prefabricated track slab and preparation method thereof

Abstract

A kind of high insulation elastic isolation material of rail transit prefabricated track slab and preparation method thereof, isolation material is sprayed on the position of prefabricated track slab and cast-in-place concrete contact, forms the insulation isolation layer with certain thickness attached on prefabricated track slab, it is formed by component A and component B, wherein, the component A includes polypropylene oxide-castor oil polyol, tetrahydrofuran-propylene oxide copolymer diol, 1,6-hexanediol, toluene diisocyanate and isophorone diisocyanate, the component B includes 1,2-propanediol, ethylene glycol, glycol, diethylene triamine and 4,4 '-di-tert-octyl-diphenylamine;Therefore, the present application isolates between cast-in-place concrete and prefabricated slab, is convenient to replace, provides buffering action to avoid stress concentration problem, prevents water seepage and stray current protection, improves service life, reduces cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated track slab isolation insulation, in particular to a high-insulation elastic isolation material for track traffic prefabricated track slab and a preparation method thereof. BACKGROUND

[0002] In recent years, with the advancement of urbanization process in China, the city scale is continuously expanding, and various problems faced by large cities are gradually prominent, among which traffic congestion is one of the biggest challenges faced by each city. Urban rail transit can alleviate the problem of difficulty in travel of citizens to a certain extent, so in recent years, the construction of rail transit in each city has developed rapidly.

[0003] Due to the rapid development of subway engineering, prefabricated track slabs with high early strength and fast mold turnover are widely used in subway engineering construction. The prefabricated track slabs are mostly cured and formed by steam curing. The cement hydration speed is accelerated under the steam curing environment, and has high early strength, but the faster reaction speed also easily makes the internal pores of the concrete more coarse than the standard curing concrete, and the impermeability is poorer, which creates favorable conditions for the propagation of stray current in prefabricated components in subway engineering. The stray current propagating through the prefabricated components to the underground will cause electrochemical corrosion of the internal steel bars and underground metal pipe network of the components. When the track continuously passes through the stray current, up to 10 kg of metal pipelines are easily corroded. Moreover, if the cast-in-place concrete and the prefabricated slab are not isolated and buffered, the vibration is easily directly transmitted, and over a long period of time, the current corrosion and vibration easily cause serious economic and environmental problems, and also affect the operation safety of the subway track system and threaten the safety of passengers.

[0004] Therefore, the designer of the present application, in view of the above defects, through diligent research and design, and based on the experience and achievements accumulated in the related industry for many years, has designed a high-insulation elastic isolation material for track traffic prefabricated track slab and a preparation method thereof to overcome the above defects. SUMMARY

[0005] The present application aims to provide a high-insulation elastic isolation material for track traffic prefabricated track slab and a preparation method thereof, which can overcome the defects of the prior art, isolate the cast-in-place concrete and the prefabricated slab, facilitate replacement, provide a buffering effect to avoid stress concentration problems, prevent water seepage and stray current protection, improve the service life, and reduce the cost.

[0006] To achieve the above-mentioned purpose, the present application discloses a high-insulation elastic isolation material for track traffic prefabricated track slab, which is sprayed on the position of the prefabricated track slab in contact with the cast-in-place concrete to form an insulation isolation layer with a certain thickness attached to the prefabricated track slab, and is characterized by being composed of component A and component B.

[0007] The A component comprises polyoxypropylene-castor oil polyol, tetrahydrofuran-propylene oxide copolydiol, 1,6-hexanediol, toluene diisocyanate and isophorone diisocyanate, and the B component comprises 1,2-propanediol, ethylene glycol, diethylene glycol, diethylene triamine and 4,4'-di-tert-octyl-diphenylamine.

[0008] The mass fraction (total 100) of the A component is:

[0009] Polyoxypropylene-castor oil polyol: 27.0-28.5;

[0010] Tetrahydrofuran-propylene oxide copolydiol: 35.0-36.0;

[0011] 1,6-hexanediol: 9.0-12.0;

[0012] Toluene diisocyanate: 13.0-16.0;

[0013] Isophorone diisocyanate: 10.0-16.0.

[0014] The mass fraction (total 100) of the B component is:

[0015] 1,2-propanediol: 41-47;

[0016] Ethylene glycol: 22-27;

[0017] Diethylene glycol: 22-28;

[0018] Diethylene triamine: 4-7;

[0019] 4,4'-di-tert-octyl-diphenylamine: 0.1-0.3.

[0020] The mass ratio of the A component and the B component is 1:0.03-0.05, and after uniform mixing and stirring, they are brushed or rolled on the surface of the prefabricated track plate to achieve the effects of insulation, isolation, waterproofing and vibration reduction.

[0021] Wherein:

[0022] The mass fraction (total 100) of the A component is:

[0023] Polyoxypropylene-castor oil polyol: 28.0;

[0024] Tetrahydrofuran-propylene oxide copolydiol: 35.5;

[0025] 1,6-hexanediol: 9.0;

[0026] Toluene diisocyanate: 16.0;

[0027] Isophorone diisocyanate: 11.5;

[0028] Parts by mass of the B component (total 100):

[0029] 1,2-propanediol: 46;

[0030] Ethylene glycol: 22;

[0031] Diethylene glycol: 26;

[0032] Diethylenetriamine: 5.9;

[0033] 4,4'-di-tert-octyl-diphenylamine: 0.1.

[0034] Parts by mass of the A component (total 100):

[0035] Polyoxypropylene-castor oil polyol: 27.0;

[0036] Tetrahydrofuran-propylene oxide copolymer diol: 35.0;

[0037] 1,6-hexanediol: 10.0;

[0038] Toluene diisocyanate: 13.0;

[0039] Isophorone diisocyanate: 15.0;

[0040] Parts by mass of the B component (total 100): 1,2-propanediol: 45.5;

[0041] Ethylene glycol: 24.5;

[0042] Diethylene glycol: 24.9;

[0043] Diethylenetriamine: 4.9;

[0044] 4,4'-di-tert-octyl-diphenylamine: 0.2.

[0045] Parts by mass of the A component (total 100):

[0046] Polyoxypropylene-castor oil polyol: 28.5;

[0047] Tetrahydrofuran-propylene oxide copolymer diol: 36;

[0048] 1,6-hexanediol: 10.5;

[0049] Toluene diisocyanate: 12.0;

[0050] Isophorone diisocyanate: 13.0;

[0051] Parts by mass (total 100) of the B component are: 1,2-propanediol: 44.0;

[0052] Ethylene glycol: 25.0;

[0053] Diethylene glycol: 25.7;

[0054] Diethylenetriamine: 5;

[0055] 4,4'-di-tert-octyl-diphenylamine: 0.3.

[0056] Parts by mass (total 100) of the A component are:

[0057] Polyoxypropylene-castor oil polyol (molecular weight 1300): 28.5; tetrahydrofuran-oxypropylene copolydiol (molecular weight 1500): 35.0;

[0058] 1,6-hexanediol: 10.5;

[0059] Toluene diisocyanate: 15.0;

[0060] Isophorone diisocyanate: 11.0;

[0061] Parts by mass (total 100) of the B component are:

[0062] 1,2-propanediol: 47.0;

[0063] Ethylene glycol: 23.0;

[0064] Diethylene glycol: 23.8;

[0065] Diethylenetriamine: 6.0;

[0066] 4,4'-di-tert-octyl-diphenylamine: 0.2.

[0067] Also disclosed is a preparation method of the high-insulation elastic isolation material of the rail transit prefabricated track slab described above, characterized by comprising the following steps:

[0068] Step one: add the polyoxypropylene-castor oil polyol, tetrahydrofuran-oxypropylene copolydiol, and 1,6-hexanediol in the A component into a reaction kettle, start a stirrer, and heat to about 60°C, start a vacuum pump, slowly raise the vacuum degree to 0.095-0.1, and heat to 110-120°C, and keep for 4h;

[0069] Step two: cool to 80°C, drop the toluene diisocyanate and isophorone diisocyanate in the A component at the same time, stir and react under vacuum for 5h, then discharge the A component, and place in a sealed container under nitrogen protection for standby;

[0070] Step three: 1,2-propanediol, ethylene glycol, diethylene glycol in the B component are added into a reaction kettle respectively, a vacuum pump is started, the vacuum degree is slowly increased to 0.095-0.1 (gauge pressure negative pressure), and the temperature is increased to 120-125 DEG C, and is kept for 2h;

[0071] Step four: the temperature is decreased to 50 DEG C, diethylenetriamine, 4,4'-di-tert-octyl-diphenylamine in the B component are added, stirring is carried out under vacuum for 1h, and then the B component is discharged, and is placed in a sealed container under nitrogen protection for standby;

[0072] Step five: mixing is carried out according to the A component:B component (mass ratio) =1:0.03-0.05, and stirring is uniformly carried out, and then the product can be used.

[0073] Among them: after use, the technical indexes in table 1 are reached:

[0074] Table 1 technical indexes

[0075]

[0076]

[0077] From the above content, the high insulation elastic isolation material of the rail transit prefabricated track slab and the preparation method thereof have the following effects:

[0078] 1. The isolation between cast-in-place concrete and prefabricated slab is realized, so that when the track slab needs to be replaced in the future rail transit operation, the track slab can be conveniently separated from the cast-in-place structure during lifting.

[0079] 2. The track slab limiting part plays a certain buffering role, avoiding stress concentration problems of the track slab at the limiting structure; the isolation material also has good insulation and waterproof performance, which is beneficial to prevent water seepage and stray current on the surface of the track slab and improve the durability of the track slab.

[0080] 3. The track slab can be firmly bonded, is resistant to acid, alkali and salt corrosion, hydrolysis, wear, oil, high temperature 150 DEG C, low temperature-80 DEG C, ultraviolet aging, fatigue, has excellent shock absorption and noise reduction performance, is suitable for high-frequency flexing application, has excellent comprehensive performance, and adapts to dynamic load deformation.

[0081] The detailed content of the application can be obtained through the following description. DETAILED DESCRIPTION

[0082] The application relates to a high insulation elastic isolation material of a rail transit prefabricated track slab and a preparation method thereof.

[0083] The high-insulation elastic isolation material of the rail transit prefabricated track slab is sprayed on the position of the prefabricated track slab in contact with the cast-in-place concrete, forming an insulation isolation layer with a certain thickness attached to the prefabricated track slab, which is mainly composed of the component A and the component B. The component A contains polypropylene oxide-castor oil polyol (molecular weight 1300), tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500), toluene diisocyanate and isophorone diisocyanate (polypropylene oxide-castor oil polyol and tetrahydrofuran-propylene oxide copolymer diol can better provide the hydroxyl groups required in the copolymerization reaction, and toluene diisocyanate and isophorone diisocyanate can provide the isocyanate groups in the copolymerization reaction, and the urethane groups and isocyanate groups generated during the reaction are the main components of the component A, wherein the urethane groups are the prepolymer part, and the isocyanate groups will further react with the hydroxyl groups in the component B to generate a final solid material), and the component B contains 1,2-propanediol, ethylene glycol, diethylene glycol, diethylene triamine and 4,4'-di-tert-octyl-diphenylamine (1,2-propanediol, ethylene glycol and diethylene glycol are raw materials containing hydroxyl groups, which provide the hydroxyl groups required for polymerization reaction, and further react with the isocyanate groups in the component A under the action of suitable environment and additives. Among them, 1,2-propanediol can improve the ductility of the final synthetic material; ethylene glycol can improve the frost resistance of the material; diethylene glycol can improve the insulation performance of the material. Diethylene triamine and 4,4'-di-tert-octyl-diphenylamine are chain extenders, wherein diethylene triamine can lengthen the molecular chain length of the urethane group, so that the final synthetic material has more elasticity; 4,4'-di-tert-octyl-diphenylamine has a catalytic effect of accelerating the reaction while extending the chain, which can adjust the reaction time of the components A and B and facilitate on-site construction).

[0084] In the preferred embodiment of the present application, the mass fraction (total 100) of the component A is:

[0085] Polypropylene oxide-castor oil polyol (molecular weight 1300): 27.0-28.5;

[0086] Tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500): 35.0-36.0;

[0087] 1,6-hexanediol: 9.0-12.0;

[0088] Toluene diisocyanate: 13.0-16.0;

[0089] Isophorone diisocyanate: 10.0-16.0.

[0090] The mass fraction (total 100) of the component B is:

[0091] 1,2-propanediol: 41-47;

[0092] Ethylene glycol: 22-27;

[0093] Diethylene glycol: 22-28;

[0094] Diethylene triamine: 4-7;

[0095] 4,4'-di-tert-octyl-diphenylamine: 0.1-0.3.

[0096] The mass ratio of the A component and the B component is 1:0.03-0.05 (through the specific mass ratio, the final product generated is a high-elastic high-toughness material mainly with urethane groups and having a certain structural strength, which can absorb part of energy through material deformation when stressed, thereby playing a very good vibration reduction role, and the coating position is in the middle of the two-layer concrete structure, which can separate the two layers of concrete, and the material can also play an excellent isolation role), after uniform mixing and stirring, the mixture is brushed or rolled on the surface of the prefabricated track slab to form an insulation and isolation layer, thereby achieving the effects of insulation, isolation, waterproofing and vibration reduction.

[0097] In the present application, the preparation method of the high-insulation elastic isolation material for the prefabricated track slab of rail transit comprises the following steps:

[0098] Step one: add polypropylene oxide-castor oil polyol, tetrahydrofuran-propylene oxide copolymer diol and 1,6-hexanediol in the A component into a reaction kettle, start the stirrer, heat to about 60°C, start the vacuum pump, slowly increase the vacuum degree to 0.095-0.1 (gauge negative pressure), and heat to 110-120°C and keep for about 4h.

[0099] Step two: cool to 80°C, drop the toluene diisocyanate and isophorone diisocyanate in the A component at the same time, stir under vacuum for 5h, then discharge the A component, and store in a sealed container under nitrogen protection.

[0100] Step three: add 1,2-propanediol, ethylene glycol, diethylene glycol and white carbon black in the B component into a reaction kettle, start the vacuum pump, slowly increase the vacuum degree to 0.095-0.1 (gauge negative pressure), and heat to 120-125°C and keep for about 2h.

[0101] Step four: reduce the temperature to 50°C, add diethylene triamine and 4,4'-di-tert-octyl-diphenylamine in the B component, stir under vacuum for 1h, then discharge the B component, and store in a sealed container under nitrogen protection;

[0102] Step five: mix according to the mass ratio of the A component to the B component = 1:0.03-0.05, stir uniformly, and then use, brush or roll on the surface of the prefabricated track slab to form an insulation and isolation layer, thereby achieving the effects of insulation, isolation, waterproofing and vibration reduction.

[0103] The insulation isolation layer formed by the above method can achieve the technical indexes in Table 1.

[0104] Table 1 Technical Indexes

[0105]

[0106]

[0107] The following is further described in detail through several specific examples: Specific Example One:

[0109] The mass parts (totaling 100) of the A component are:

[0110] Polyoxypropylene-castor oil polyol (molecular weight 1300): 28.0;

[0111] Tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500): 35.5;

[0112] 1,6-hexanediol: 9.0;

[0113] Toluene diisocyanate: 16.0;

[0114] Isophorone diisocyanate: 11.5.

[0115] The mass parts (totaling 100) of the B component are:

[0116] 1,2-propanediol: 46;

[0117] Ethylene glycol: 22;

[0118] Diethylene glycol: 26;

[0119] Diethylenetriamine: 5.9;

[0120] 4,4'-di-tert-octyl-diphenylamine: 0.1.

[0121] After the A component and the B component are prepared according to the above method, they are mixed and stirred uniformly according to a mass ratio of 1:0.03, and through measurement, the technical indexes in Table 2 are achieved.

[0122] Table 2 Technical Indexes of Example One

[0123]

[0124] Specific Example Two:

[0126] The mass parts (totaling 100) of the A component are:

[0127] Polypropylene oxide-castor oil polyol (molecular weight 1300): 27.0; tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500): 35.0; 1,6-hexanediol: 10.0;

[0128] Toluene diisocyanate: 13.0;

[0129] Isophorone diisocyanate: 15.0.

[0130] The mass parts (total 100) of the B component are:

[0131] 1,2-propanediol: 45.5;

[0132] Ethylene glycol: 24.5;

[0133] Diethylene glycol: 24.9;

[0134] Diethylene triamine: 4.9;

[0135] 4,4'-di-tert-octyl-diphenylamine: 0.2;

[0136] After preparing the A component and the B component according to the above method, they are mixed and stirred uniformly according to the mass ratio 1:0.04, and through measurement, the technical indexes in Table 3 are reached.

[0137] Technical indexes of Example Two in Table 3

[0138]

[0139] Specific Example Three:

[0141] The mass parts (total 100) of the A component are:

[0142] Polypropylene oxide-castor oil polyol (molecular weight 1300): 28.5;

[0143] Tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500): 36;

[0144] 1,6-hexanediol: 10.5;

[0145] Toluene diisocyanate: 12.0;

[0146] Isophorone diisocyanate: 13.0.

[0147] The mass parts (total 100) of the B component are: 1,2-propanediol: 44.0;

[0148] Ethylene glycol: 25.0;

[0149] Diethylene glycol: 25.7;

[0150] Diethylenetriamine: 5;

[0151] 4,4'-Di-tert-octyl-diphenylamine: 0.3;

[0152] After the A component and the B component are prepared according to the above method, they are mixed and stirred uniformly according to the mass ratio of 1:0.05, and through measurement, the technical indexes in Table 4 are reached.

[0153] Table 4 Technical indexes of Example Three

[0154] Specific Example Four:

[0156] The mass parts (total 100) of the A component are:

[0157] Polyoxypropylene-castor oil polyol (molecular weight 1300): 28.5;

[0158] Tetrahydrofuran-propylene oxide copolymer diol (molecular weight 1500): 35.0;

[0159] 1,6-Hexanediol: 10.5;

[0160] Toluene diisocyanate: 15.0;

[0161] Isophorone diisocyanate: 11.0.

[0162] The mass parts (total 100) of the B component are:

[0163] 1,2-Propanediol: 47.0;

[0164] Ethylene glycol: 23.0;

[0165] Diethylene glycol: 23.8;

[0166] Diethylenetriamine: 6.0;

[0167] 4,4'-Di-tert-octyl-diphenylamine: 0.2;

[0168] After the A component and the B component are prepared according to the above method, they are mixed and stirred uniformly according to the mass ratio of 1:0.05, and through measurement, the technical indexes in Table 5 are reached.

[0169] Table 5 Technical indexes of Example Four

[0170]

[0171]

[0172] Through a large number of tests and experiments, it can be seen that the high-insulation elastic isolation material of the rail transit prefabricated track slab can realize the performance comparison in table 6 as follows compared with the existing material:

[0173] Table 6 Performance comparison table of high-insulation elastic isolation material and waterproof paint

[0174]

[0175]

[0176] As can be clearly seen from table 6, the high-insulation elastic isolation material of the rail transit prefabricated track slab of the application realizes firm bonding with the track slab through the specific setting of the material components, the ratio and the process, and has superior performance, realizes acid, alkali and salt corrosion resistance, hydrolysis resistance, wear resistance, oil resistance, high temperature resistance of 150 DEG C, low temperature resistance of-80 DEG C, ultraviolet aging resistance, fatigue resistance, at the same time, has excellent shock absorption and noise reduction performance, is effectively suitable for high-frequency flexure application, the insulation isolation layer formed by the material has excellent comprehensive performance, adapts to dynamic load deformation, greatly improves the overall performance and service life.

[0177] It is obvious that the above description and record are only examples and are not intended to limit the disclosure, application or use of the present application. Although the specific examples described in the embodiments are currently considered as the best mode for implementing the teachings of the present application, the scope of the present application will include any embodiments falling within the preceding description and the appended claims.

Claims

1. A highly insulating elastic insulating material for precast track slabs used in rail transit, sprayed onto the precast track slab at the contact point with cast-in-place concrete to form an insulating insulating layer of a certain thickness attached to the precast track slab, characterized in that... Composed of component A and component B: Component A comprises polyoxypropylene-castor oil polyol, tetrahydrofuran-propylene oxide copolydiol, 1,6-hexanediol, toluene diisocyanate and isophorone diisocyanate, and component B comprises 1,2-propanediol, ethylene glycol, diethylene glycol, diethylenetriamine and 4,4'-ditert-octyl-diphenylamine. The mass fractions of component A (total 100) are: Polyoxypropylene-castor oil polyol: 27.0~28.5; Tetrahydrofuran-propylene oxide copolymer glycol: 35.0~36.0; 1,6-Hexanediol: 9.0–12.0; Toluene diisocyanate: 13.0–16.0; Isophorone diisocyanate: 10.0–16.0; The mass fractions of component B (total 100) are: 1,2-Propanediol: 41–47; Ethylene glycol: 22-27; Diethylene glycol monocondensation: 22-28; Diethylenetriamine: 4-7; 4,4'-Di-tert-octyl-diphenylamine: 0.1–0.3; The ratio of component A to component B (by mass) is 1:0.03 to 0.

05. After mixing and stirring evenly, the mixture is brushed or rolled onto the surface of the precast track slab to achieve insulation, isolation, waterproofing, and vibration reduction. This isolates the cast-in-place concrete from the precast slab, facilitating easy separation later. It also avoids stress concentration at the limiting structure of the track slab, helps prevent water seepage and stray current on the track slab surface, and has excellent overall performance, adapting to dynamic load deformation.

2. The high-insulation elastic insulating material for prefabricated track slabs in rail transit as described in claim 1, characterized in that: The mass fractions of component A (total 100) are: Polypropylene oxide-castor oil polyol: 28.0; Tetrahydrofuran-propylene oxide copolydiol: 35.5; 1,6-Hexanediol: 9.0; Toluene diisocyanate: 16.0; Isophorone diisocyanate: 11.5; The mass fractions of component B (total 100) are: 1,2-Propanediol: 46; Ethylene glycol: 22; Diethylene glycol monocondensation: 26; Diethylenetriamine: 5.9; 4,4'-Di-tert-octyl-diphenylamine: 0.

1.

3. The high-insulation elastic insulating material for prefabricated track slabs in rail transit as described in claim 1, characterized in that: The mass fractions of component A (total 100) are: Polypropylene oxide-castor oil polyol: 27.0; Tetrahydrofuran-propylene oxide copolydiol: 35.0; 1,6-Hexanediol: 10.0; Toluene diisocyanate: 13.0; Isophorone diisocyanate: 15.0; The mass fractions of component B (total 100) are: 1,2-Propanediol: 45.5; Ethylene glycol: 24.5; Diethylene glycol monocondensation: 24.9; Diethylenetriamine: 4.9; 4,4'-Di-tert-octyl-diphenylamine: 0.

2.

4. The high-insulation elastic insulating material for prefabricated track slabs in rail transit as described in claim 1, characterized in that: The mass fractions of component A (total 100) are: Polypropylene oxide-castor oil polyol: 28.5; Tetrahydrofuran-propylene oxide copolydiol: 36; 1,6-Hexanediol: 10.5; Toluene diisocyanate: 12.0; Isophorone diisocyanate: 13.0; The mass fractions of component B (total 100) are: 1,2-Propanediol: 44.0; Ethylene glycol: 25.0; Diethylene glycol monocondensation: 25.7; Diethylenetriamine: 5; 4,4'-Di-tert-octyl-diphenylamine: 0.

3.

5. The high-insulation elastic insulating material for prefabricated track slabs in rail transit as described in claim 1, characterized in that: The mass fractions of component A (total 100) are: Polypropylene oxide-castor oil polyol (molecular weight 1300): 28.5; Tetrahydrofuran-propylene oxide copolymer (molecular weight 1500): 35.0; 1,6-Hexanediol: 10.5; Toluene diisocyanate: 15.0; Isophorone diisocyanate: 11.0; The mass fractions of component B (total 100) are: 1,2-Propanediol: 47.0; Ethylene glycol: 23.0; Diethylene glycol monocondensation: 23.8; Diethylenetriamine: 6.0; 4,4'-Di-tert-octyl-diphenylamine: 0.

2.

6. A method for preparing a highly insulating elastic insulating material for prefabricated track slabs in rail transit as described in any one of claims 1-5, characterized in that... It includes the following steps: Step 1: Add the polyoxypropylene-caster oil polyol, tetrahydrofuran-propylene oxide copolymer diol, and 1,6-hexanediol from component A to the reactor, start the stirrer, and heat to about 60°C. Start the vacuum pump to slowly increase the vacuum to 0.095-0.1, and heat to 110-120°C for 4 hours. Step 2: Cool down to 80℃, add toluene diisocyanate and isophorone diisocyanate from component A dropwise, stir and react under vacuum for 5 hours, then discharge component A and place it in a sealed container under nitrogen protection for later use. Step 3: Add 1,2-propanediol, ethylene glycol, and diethylene glycol from component B to the reactor, start the vacuum pump, and slowly raise the vacuum level to 0.095-0.1 (gauge negative pressure), raise the temperature to 120-125℃, and maintain for 2 hours; Step 4: Lower the temperature to 50℃, add diethylenetriamine and 4,4'-ditert-octyl-diphenylamine from component B, stir under vacuum for 1 hour, then discharge component B and place it in a sealed container under nitrogen protection for later use. Step 5: Mix component A and component B (mass ratio) at a ratio of 1:0.03 to 0.05, and stir until homogeneous before use.

7. The method for preparing the high-insulation elastic insulating material for prefabricated track slabs in rail transit as described in claim 6, characterized in that: Achieve the technical specifications in Table 1: Table 1 Technical Specifications

Images