A room temperature curing two-component polyurethane pouring sealant for rail transit floor and a preparation method and application thereof

Abstract

The application provides a room temperature curing two-component polyurethane pouring sealant for rail transit floor and a preparation method and application thereof, which comprises component A and component B; the preparation raw materials of the component A comprise a compound with a structure of formula I, a compound with a structure of formula II, polyol modified rubber and hollow glass microbeads with a mass ratio of (8-12):(32-38):(7-13):(42-48); and the preparation raw materials of the component B comprise a compound with a structure of formula III, triphenylmethane triisocyanate and a water removing agent with a mass ratio of (67-73):(26-30):(1.5-2). The pouring sealant prepared by controlling the above-mentioned kinds and amounts of raw materials has excellent open time, high plate-core glass strength, flat tensile strength, flat compression strength, good sound insulation performance, excellent point load and static load experiment performance, and high plate-core shear force.

Description

Technical Field

[0001] This invention belongs to the field of potting compound technology, and particularly relates to a room temperature curing two-component polyurethane potting compound for a new type of lightweight rail transit floor, its preparation method and application. Background Technology

[0002] With the rapid development of the rail transit industry, the demand for bonding materials for train interior floors is also increasing. Traditional floor material bonding often relies on mechanical connections or simple adhesive bonding, but these methods often suffer from problems such as low bonding strength, short service life, poor heat resistance, and easy aging. Epoxy adhesives, as a high-performance bonding material, are widely used in the rail transit field.

[0003] However, existing epoxy adhesives often have the characteristics of high hardness, brittleness, insufficient toughness, and difficulty in removal, which makes it difficult to meet the special requirements of rail transit floor materials. These problems seriously affect the safety and service life of rail transit floors. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a room temperature curing two-component polyurethane potting compound for a novel lightweight rail transit floor, its preparation method and application, wherein the potting compound has excellent strength and can control the open time.

[0005] This invention provides a room temperature curing two-component polyurethane potting compound for rail transit flooring, comprising component A and component B;

[0006] The raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber, and hollow glass microspheres;

[0007] Formula I, wherein R is selected from C12 to C14 alkyl groups;

[0008] Formula II;

[0009] The raw materials for preparing component B include a compound having the structure of formula III, triphenylmethane triisocyanate, and a dehydrating agent;

[0010] Formula III;

[0011] In Formulas II and III, M0 is provided by modified castor oil polyol;

[0012] The mass ratio of compounds with Formula I, compounds with Formula II, polyol-modified rubber, and hollow glass microspheres in component A is (8~12):(32~38):(7~13):(42~48);

[0013] The mass ratio of the compound with the structure of formula III, triphenylmethane triisocyanate and dehydrating agent in component B is (67~73):(26~30):(1.5~2).

[0014] Preferably, the mass ratio of component A to component B is 2:0.95~1.05.

[0015] Preferably, the polyol-modified rubber is C5 hydrogenated petroleum resin R45V;

[0016] The dehydrating agent is Additive OF dehydrating agent.

[0017] Preferably, the raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber R45V, and HX-60M hollow glass microspheres in a mass ratio of 10:35:10:45; or include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber R45V, and HX-60M hollow glass microspheres in a mass ratio of 10:33:12:45.

[0018] The raw materials for preparing component B include a compound having the structure of formula III, triphenylmethane triisocyanate, and dehydrating agent Additive OF in a mass ratio of 70:28:2; or include a compound having the structure of formula III, triphenylmethane triisocyanate, and dehydrating agent Additive OF in a mass ratio of 73:25:2.

[0019] This invention provides a method for preparing the room-temperature curing two-component polyurethane potting compound described in the above technical solution, comprising the following steps:

[0020] After mixing the compound with the structure of Formula I, the compound with the structure of Formula II and the polyol-modified rubber, hollow glass microspheres are added and mixed until homogeneous to obtain component A;

[0021] The compound having the structure of formula III was mixed with triphenylmethane triisocyanate and then a dehydrating agent was added to obtain component B;

[0022] Mixing component A and component B yields a room-temperature curing two-component polyurethane potting compound.

[0023] Preferably, the compound having the structure of Formula II is prepared by the following method:

[0024] After dehydrating the castor oil polyol and cooling it, isophorone diisocyanate was added for chain extension reaction. Then, dehydrated poly-3-methyltetrahydrofuran diol was added to continue the reaction to obtain a compound with the structure of formula II.

[0025] The chain extension reaction is carried out at a temperature of 65~75℃ for a time of 3.8h~4.2h.

[0026] The reaction continues for 1.8h to 2.2h.

[0027] Preferably, the compound having the structure of Formula I is prepared by the following method:

[0028] Phosphoric acid and epoxy diluent AGE were mixed and reacted at 55-65℃ for 3.5-4.5 h to obtain a compound with the structure of formula I.

[0029] The molar ratio of phosphoric acid to epoxy diluent AGE is 1:3~3.2.

[0030] Preferably, the compound having the structure of Formula III is prepared by the following method:

[0031] After dehydrating the castor oil polyol, the temperature was lowered to 80-85℃, and H-DMI was added. The reaction was carried out for 2.8-3.2 hours to obtain a compound with the structure of formula III.

[0032] This invention provides an application of the room temperature curing two-component polyurethane potting compound described above in the potting of rail transit flooring.

[0033] Preferably, the rail transit floor comprises a first fireproof board, a first adhesive board, a polystyrene foam board, a second adhesive board, and a second fireproof board arranged in sequence.

[0034] A two-component polyurethane potting compound is used to pot the first adhesive board, the polystyrene foam board, and the second adhesive board.

[0035] This invention provides a room-temperature curing two-component polyurethane potting compound for rail transit flooring, comprising component A and component B. Component A is prepared from raw materials including a compound having structure I, a compound having structure II, a polyol-modified rubber, and hollow glass microspheres. Component B is prepared from raw materials including a compound having structure III, triphenylmethane triisocyanate, and a dehydrating agent. The mass ratio of the compound having structure I, the compound having structure II, the polyol-modified rubber, and the hollow glass microspheres in component A is (8~12):(32~38):(7~13):(42~48). The mass ratio of the compound having structure III, triphenylmethane triisocyanate, and the dehydrating agent in component B is (67~73):(26~30):(1.5~2). This invention prepares component A and component B by controlling the types and amounts of the above-mentioned raw materials respectively. The prepared potting compound has excellent open time, high strength of the core-pane glass, high tensile strength and compressive strength, good sound insulation performance, excellent performance in point load and static load tests, and also has high core-pane shear force. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the rail transit floor provided by the present invention. Detailed Implementation

[0037] This invention provides a room temperature curing two-component polyurethane potting compound for rail transit flooring, comprising component A and component B;

[0038] The raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber, and hollow glass microspheres;

[0039] Formula I, wherein R is selected from C12 to C14 alkyl groups;

[0040] Formula II,

[0041] M0 is provided by modified castor oil polyol; specifically, M0 is provided by Vantrus T-400 with a hydroxyl value of 400 mg / KOH / g and a molecular weight of 423.

[0042] The raw materials for preparing component B include a compound having the structure of formula III, triphenylmethane triisocyanate, and a dehydrating agent;

[0043] Formula III,

[0044] In Formula III, M0 is provided by modified castor oil polyol; specifically, the M0 is made of Vantrus T-400, with a hydroxyl value of 400 mg / KOH / g and a molecular weight of 423.

[0045] The mass ratio of compounds with Formula I, compounds with Formula II, polyol-modified rubber, and hollow glass microspheres in component A is (8~12):(32~38):(7~13):(42~48);

[0046] The mass ratio of the compound with the structure of formula III, triphenylmethane triisocyanate and dehydrating agent in component B is (67~73):(26~30):(1.5~2).

[0047] In this invention, the mass ratio of component A to component B is preferably 2:0.95~1.05, more preferably 2:0.98~1.03, and most preferably 2:1.

[0048] The polyol-modified rubber in this invention is C5 hydrogenated petroleum resin R45V; the dehydrating agent is AdditiveOF dehydrating agent. The hollow glass microspheres are preferably HX-60M hollow glass microspheres.

[0049] The compound having Formula I in this invention has flame retardant, viscosity reducing and plasticizing effects; the compound having Formula II can improve low-temperature flexibility; the compound having Formula III is a trifunctional curing agent that improves the toughness and curing effect of potting compound.

[0050] The dehydrating agent described in this invention improves storage stability. The polyol-modified rubber enhances the toughness and impact resistance of the potting compound. The hollow glass microspheres, acting as a filler, provide support to the potting compound and improve its compressive strength. The triphenylmethane triisocyanate, as a rigid curing agent, increases the bulk strength of the potting compound.

[0051] In specific embodiments of the present invention, the compound having the structure of Formula I has flame retardant, viscosity reducing and plasticizing effects; the compound having the structure of Formula II has the effect of improving low-temperature flexibility; the polyol modified rubber can improve the toughness and impact resistance of the potting compound; the hollow glass microspheres, as fillers, play a supporting role and can improve compressive strength.

[0052] This invention provides a method for preparing the room-temperature curing two-component polyurethane potting compound described in the above technical solution, comprising the following steps:

[0053] After mixing the compound with the structure of Formula I, the compound with the structure of Formula II and the polyol-modified rubber, hollow glass microspheres are added and mixed until homogeneous to obtain component A;

[0054] The compound having the structure of formula III was mixed with triphenylmethane triisocyanate and then a dehydrating agent was added to obtain component B;

[0055] Mixing component A and component B yields a room-temperature curing two-component polyurethane potting compound.

[0056] In this invention, a compound having the structure of Formula I, a compound having the structure of Formula II, and a polyol-modified rubber are mixed, and then hollow glass microspheres are added and mixed until homogeneous to obtain component A.

[0057] In this invention, the compound having the structure of Formula I is:

[0058] Formula I, wherein R is selected from C12 to C14 alkyl groups.

[0059] The compound having the structure of Formula I described in this invention is prepared by the following method:

[0060] Phosphoric acid and epoxy diluent AGE were mixed and reacted at 55-65℃ for 3.5-4.5 h to obtain a compound with the structure of formula I.

[0061] The molar ratio of phosphoric acid to epoxy diluent AGE is 1:3~3.2.

[0062] The epoxy diluent AGE is dodecyl glycidyl ether to tetradecyl glycidyl ether.

[0063] The specific reaction route for compounds with the structure of Formula I is as follows:

[0064] ;

[0065] Wherein, R is an alkyl group selected from C12 to C14.

[0066] The compound having the structure of formula II described in this invention is prepared by the following method:

[0067] After dehydrating the castor oil polyol and cooling it, isophorone diisocyanate (IPDI) was added for chain extension reaction. Then, dehydrated poly-3-methyltetrahydrofuran diol was added to continue the reaction to obtain a compound with the structure of formula II.

[0068] The chain extension reaction is carried out at a temperature of 65~75℃, specifically 65℃, 70℃ or 75℃; and for a time of 3.8h~4.2h, specifically 3.8h, 4h or 4.2h.

[0069] The reaction time can be 1.8h to 2.2h, specifically 1.8h, 2h or 2.2h.

[0070] In this invention, the compound having the structure of Formula II is specifically prepared according to the following route:

[0071] .

[0072] In a specific embodiment, the castor oil polyol is Vantrus Polycins T-400.

[0073] In this invention, a compound having the structure of formula III is mixed with triphenylmethane triisocyanate and then a dehydrating agent is added to obtain component B.

[0074] In this invention, the compound having the structure of Formula III is prepared by the following method:

[0075] After dehydrating the castor oil polyol, the temperature was lowered to 80-85℃, and H-DMI was added. The reaction was carried out for 2.8-3.2 hours to obtain a compound with the structure of formula III.

[0076] In this invention, castor oil polyol is preferably dehydrated by vacuuming at 120°C for 2 hours. This invention uses HDI-terminated castor oil polyol, which ensures low viscosity of the product output, allowing for fluidity of the potting compound and control of the open time.

[0077] In this invention, a compound having the structure of formula III and triphenylmethane triisocyanate are mixed for 40-50 minutes, and then a dehydrating agent is added; the dehydrating agent is preferably Additive OF dehydrating agent. After adding the dehydrating agent, the mixture is preferably mixed for 18-23 minutes before being discharged to obtain component B.

[0078] This invention mixes component A and component B to obtain a room-temperature curing two-component polyurethane potting compound.

[0079] This invention provides an application of the room temperature curing two-component polyurethane potting compound described above in the potting of rail transit flooring.

[0080] In this invention, the rail transit floor comprises a first fireproof board, a first adhesive board, a polystyrene foam board, a second adhesive board, and a second fireproof board arranged sequentially.

[0081] A two-component polyurethane potting compound is used to pot the first adhesive board, the polystyrene foam board, and the second adhesive board.

[0082] See Figure 1 , Figure 1 This is a schematic diagram of the structure of the rail transit floor provided in this invention.

[0083] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, provides a room-temperature curing two-component polyurethane potting compound for a novel lightweight rail transit floor, its preparation method, and its application. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0084] Preliminary example

[0085] Phosphoric acid and epoxy diluent AGE were mixed and reacted at 60°C for 4 hours to obtain a compound with the structure of Formula I, where R is a structure other than epoxy in the epoxy diluent; the molar ratio of phosphoric acid and epoxy diluent AGE was 1:3.

[0086] Castor oil polyol (Polycins T-400) was dehydrated under vacuum at 120°C for 2 hours, and the reaction temperature was lowered to 70°C. IDPI was then added, and the reaction was continued for 4 hours. Subsequently, dehydrated 3MCPG-1450 (poly-3-methyltetrahydrofuran diol, Lycra molecular weight 1450) was added, and the reaction was continued for 2 hours to obtain a compound with the structure of formula II.

[0087] Castor oil polyol (Polycins T-400) was heated at 120°C under vacuum for 2 hours, and the reaction temperature was lowered to 85°C. H-MDI was then added, and the reaction was stopped after 3 hours to obtain a compound with the structure of formula III.

[0088] Example 1

[0089] Mix 10% of the compound with structure I, 35% of the compound with structure II, and 10% of the polyol-modified rubber R45V for 40 min, then add 45% of HX-60M hollow glass microspheres and mix until homogeneous to obtain component A.

[0090] 70% of the compound having the structure of formula III and 28% of triphenylmethane triisocyanate were mixed, and then 2% of the dehydrating agent Additive OF was added under nitrogen to obtain component B;

[0091] Mix component A and component B at a mass ratio of 2:1 to obtain a room temperature curing two-component polyurethane potting compound.

[0092] The performance of the polyurethane potting compound prepared in Example 1 was tested, and the results are shown in Table 1:

[0093] Table 1

[0094]

[0095] Example 2

[0096] The difference from Example 1 is that component A contains 33% of the compound with structure II and 12% of the polyol-modified rubber R45V;

[0097] Component B contains 73% compounds with the structure of formula III and 25% triphenylmethane triisocyanate.

[0098] The performance of the polyurethane potting compound prepared in Example 2 was tested, and the results are shown in Table 2:

[0099] Table 2

[0100]

[0101] Comparative Example 1

[0102] The difference from Example 1 is that the compound with the structure of Formula I in component A is replaced with a modified castor oil polyol: Vantrus Polycins T-400.

[0103] The performance of the polyurethane potting compound prepared in Comparative Example 1 was tested, and the results are shown in Table 3:

[0104] Table 3

[0105]

[0106] Comparative Example 2

[0107] The difference from Example 1 is that the raw materials of component A do not include compounds having the structure of Formula I, and the amount of compounds having the structure of Formula II is 45%.

[0108] The performance of the polyurethane potting compound prepared in Comparative Example 2 was tested, and the results are shown in Table 4:

[0109] Table 4

[0110]

[0111] Comparative Example 3

[0112] Compared to Example 1, the raw material for component A contained 45% of the compound with the formula II structure, and no polyol-modified rubber R45V was added.

[0113] The performance of the polyurethane potting compound prepared in Comparative Example 3 was tested, and the results are shown in Table 5:

[0114] Table 5

[0115]

[0116] Comparative Example 4

[0117] Compared to Example 1, the polyol-modified rubber R45V in component A was replaced with Polyvest HT.

[0118] The performance of the polyurethane potting compound prepared in Comparative Example 4 was tested, and the results are shown in Table 6:

[0119] Table 6

[0120]

[0121] Comparative Example 5

[0122] Compared with Example 1, the difference is that the polyol-modified rubber R45V in the preparation raw materials of component A is replaced with Polyvest HT, and the HX-60M hollow glass microspheres are replaced with montmorillonite K30.

[0123] The performance of the polyurethane potting compound prepared in Comparative Example 5 was tested, and the results are shown in Table 7:

[0124] Table 7

[0125]

[0126] Comparative Example 6

[0127] The difference from Example 1 is that the compound with the structure of Formula III in the raw materials for preparing component B is replaced with TSE-100.

[0128] The performance of the polyurethane potting compound prepared in Comparative Example 6 was tested, and the results are shown in Table 8:

[0129] Table 8

[0130]

[0131] Comparative Example 7

[0132] Compared with Example 1, the difference is that the compound with the structure of Formula III in the raw materials for the preparation of component B is replaced with Desmodur N100.

[0133] The performance of the polyurethane potting compound prepared in Comparative Example 7 was tested, and the results are shown in Table 9:

[0134] Table 9

[0135]

[0136] Comparative Example 8

[0137] The difference from Example 1 is that the triphenylmethane triisocyanate in the raw materials for the preparation of component B is replaced with Desmodur E23.

[0138] The performance of the polyurethane potting compound prepared in Comparative Example 8 was tested, and the results are shown in Table 10:

[0139] Table 10

[0140]

[0141] Comparative Example 9

[0142] Compared with Example 1, the amount of the compound with Formula I structure in the raw materials for preparing component A was adjusted to 15%, and the amount of the compound with Formula I structure was adjusted to 30%.

[0143] The performance of the polyurethane potting compound prepared in Comparative Example 9 was tested, and the results are shown in Table 11:

[0144] Table 11

[0145]

[0146] Comparative Example 10

[0147] Compared with Example 1, the amount of the compound with the formula II structure in the raw materials for preparing component A was adjusted to 45%, and the amount of HX-60M hollow glass microspheres was adjusted to 35%.

[0148] The performance of the polyurethane potting compound prepared in Comparative Example 10 was tested, and the results are shown in Table 12:

[0149] Table 12

[0150]

[0151] Comparative Example 11

[0152] Compared with Example 1, the amount of the compound with the structure of Formula III in the raw materials for the preparation of component B was adjusted to 60%, and the amount of triphenylmethane triisocyanate was adjusted to 38%.

[0153] The performance of the polyurethane potting compound prepared in Comparative Example 11 was tested, and the results are shown in Table 13:

[0154] Table 13

[0155]

[0156] Comparative Example 12

[0157] The difference compared to Example 1 is as follows:

[0158] Castor oil polyol (Vantrus Polycins T-400) was dehydrated under vacuum at 120°C for 2 hours, then the reaction temperature was lowered to 70°C. IDPI was then added, and the reaction was continued for 4 hours. Afterwards, dehydrated PTMEG-1000 (polytetrahydrofuran glycol, BASF molecular weight 1000) was added, and the reaction was continued for 2 hours to obtain starting material 3. The reaction route is as follows:

[0159] ;

[0160] Replace the compound of formula II in the raw material preparation of component A in Example 1 with the above-mentioned raw material 3.

[0161] Raw material 3 has lost its fluidity and cannot be used as a potting compound.

[0162] Comparative Example 13

[0163] Castor oil polyol (Vantrus Polycins T-400) was dehydrated under vacuum at 120°C for 2 hours, then the reaction temperature was lowered to 70°C. IDPI was then added, and the reaction was continued for 4 hours. Dehydrated PPG was then added, and the reaction was continued for 2 hours to obtain starter 4, a pale yellow liquid. The reaction route is shown below:

[0164] ;

[0165] Compared to Example 1, the compound with the formula II structure in the raw materials of component A was replaced with the above-mentioned raw material 4.

[0166] The performance of the polyurethane potting compound prepared in Comparative Example 11 was tested, and the results are shown in Table 14:

[0167] Table 14

[0168]

[0169] As can be seen from the above embodiments, the present invention provides a room temperature curing two-component polyurethane potting compound for rail transit flooring, comprising component A and component B; the raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber, and hollow glass microspheres; the raw materials for preparing component B include compounds having the structure of formula III, triphenylmethane triisocyanate, and a dehydrating agent; the mass ratio of compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber, and hollow glass microspheres in component A is (8~12):(32~38):(7~13):(42~48); the mass ratio of compounds having the structure of formula III, triphenylmethane triisocyanate, and a dehydrating agent in component B is (67~73):(26~30):(1.5~2). This invention prepares component A and component B by controlling the types and amounts of the aforementioned raw materials. The resulting potting compound exhibits excellent open time, high panel-core glass strength, tensile strength, and compressive strength, good sound insulation performance, and excellent performance in point load and static load tests. It also possesses high panel-core shear force. Experimental results show that with an open time of 30 minutes, the panel-core peel strength is 95~96N, the compressive strength is 5.6~6.2MPa, the tensile strength is 5.1~5.3MPa, the sound insulation reaches 55dB, there are no visible pits or deformations, and the material fails at 6.4MPa.

[0170] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A room temperature curing two-component polyurethane potting compound for use in rail transit flooring, comprising component A and component B; The raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber, and hollow glass microspheres; Equation I, where, R is selected from C12~C14 alkyl groups; Formula II; The raw materials for preparing component B include a compound having the structure of formula III, triphenylmethane triisocyanate, and a dehydrating agent; Formula III, In Formulas II and III, M0 is provided by modified castor oil polyol; The mass ratio of compounds with Formula I, compounds with Formula II, polyol-modified rubber, and hollow glass microspheres in component A is (8~12):(32~38):(7~13):(42~48); The mass ratio of the compound with the structure of formula III, triphenylmethane triisocyanate and dehydrating agent in component B is (67~73):(26~30):(1.5~2).

2. The room temperature curing two-component polyurethane potting compound according to claim 1, characterized in that, The mass ratio of component A to component B is 2:0.95~1.

05.

3. The room temperature curing two-component polyurethane potting compound according to claim 1, characterized in that, The polyol-modified rubber is C5 hydrogenated petroleum resin R45V; The dehydrating agent is Additive OF dehydrating agent.

4. The room-temperature curing two-component polyurethane potting compound according to claim 3, characterized in that, The raw materials for preparing component A include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber R45V, and HX-60M hollow glass microspheres in a mass ratio of 10:35:10:45; or include compounds having the structure of formula I, compounds having the structure of formula II, polyol-modified rubber R45V, and HX-60M hollow glass microspheres in a mass ratio of 10:33:12:

45. The raw materials for preparing component B include a compound having the structure of formula III, triphenylmethane triisocyanate, and dehydrating agent Additive OF in a mass ratio of 70:28:2; or include a compound having the structure of formula III, triphenylmethane triisocyanate, and dehydrating agent Additive OF in a mass ratio of 73:25:

2.

5. A method for preparing a room-temperature curing two-component polyurethane potting compound according to any one of claims 1 to 4, comprising the following steps: After mixing the compound with the structure of Formula I, the compound with the structure of Formula II and the polyol-modified rubber, hollow glass microspheres are added and mixed until homogeneous to obtain component A; The compound having the structure of formula III was mixed with triphenylmethane triisocyanate and then a dehydrating agent was added to obtain component B; Mixing component A and component B yields a room-temperature curing two-component polyurethane potting compound.

6. The preparation method according to claim 5, characterized in that, Compounds having the structure of formula II are prepared by the following method: After dehydrating the castor oil polyol and cooling it, isophorone diisocyanate was added for chain extension reaction. Then, dehydrated poly-3-methyltetrahydrofuran diol was added to continue the reaction to obtain a compound with the structure of formula II. The chain extension reaction is carried out at a temperature of 65~75℃ for a time of 3.8h~4.2h. The reaction continues for 1.8h to 2.2h.

7. The preparation method according to claim 5, characterized in that, Compounds having the structure of Formula I are prepared by the following method: Phosphoric acid and epoxy diluent AGE were mixed and reacted at 55-65℃ for 3.5-4.5 h to obtain a compound with the structure of formula I. The molar ratio of phosphoric acid to epoxy diluent AGE is 1:3~3.

2.

8. The preparation method according to claim 5, characterized in that, Compounds having the structure of formula III are prepared by the following method: After dehydrating the castor oil polyol, the temperature was lowered to 80-85℃, and H-DMI was added. The reaction was carried out for 2.8-3.2 hours to obtain a compound with the structure of formula III.

9. The application of the room temperature curing two-component polyurethane potting compound according to any one of claims 1 to 4 in the potting of rail transit floor.

10. The application according to claim 9, characterized in that, The rail transit floor comprises a first fireproof board, a first adhesive board, a polystyrene foam board, a second adhesive board, and a second fireproof board arranged in sequence. A two-component polyurethane potting compound is used to pot the first adhesive board, the polystyrene foam board, and the second adhesive board.

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