Synthesis method of slow reaction type polyether amine for polyisocyanurate

Abstract

The invention discloses a synthesis method of slow reaction type polyether amine for polyisocyanurate, and belongs to the field of polyurea materials. Monofunctional isocyanate is adopted to modify primary amine polyether into secondary amine polyether, required slow reaction type polyether amine is prepared, and the slow reaction type polyether amine contains an isocyanurate structure which is the same as a later polyisocyanurate (polyurea) structure, so that influence on performance is avoided. The molecular weight of the process product can be increased, 1-NH2 in the molecular structure is changed into 2-NH-through chemical reaction, and compared with a traditional process product, the number of amine reactive hydrogen in each molecular structure of the process product is not changed. According to the method, low-temperature and low-pressure reaction is carried out, the yield is high, the yield is larger than 99.80%, the primary amine content is smaller than 0.80%, flammable and explosive raw materials such as hydrogen and liquid ammonia are not used in the process, energy consumption is reduced, and operation is safe.

Description

Technical Field

[0001] This invention belongs to the technical field of polyurea materials, specifically a method for synthesizing slow-reaction polyetheramines for polyisocyanurate. Background Technology

[0002] Polyisocyanate (PUA) is an elastomer material produced by reacting isocyanate components with amine polyether (polyetheramine) components. This material is catalyst-free, chemically stable, extremely hydrophobic, and insensitive to environmental temperature and humidity. It possesses a range of advantages including high wear resistance, high strength, impact resistance, and waterproofing and corrosion resistance. First- and second-generation polyureas have very short curing times, typically solidifying in 3-5 seconds. This significantly improves construction efficiency and shortens construction cycles in large-scale projects.

[0003] However, the rapid gelation speed limits its application, as conventional methods like brushing or handheld spraying cannot be used. Replacing the primary amine polyether, a raw material for polyurea, with a less reactive secondary amine polyether yields a novel aliphatic, slow-reacting, high-performance coating material, also known as third-generation polyurea. This polyurea exhibits controllable reaction speed, good weather resistance, excellent mechanical properties, and ease of application and substrate wetting. It meets the flowability and leveling requirements for preparing defect-free coatings, showing broad application prospects in metal surface protection, flooring construction, and bridge and tunnel corrosion prevention.

[0004] There is considerable research on secondary amine polyethers in China. Fang Lianshun, Jia Zhengren, and Dong Xiaohong's paper, "Synthesis of Secondary Amine Polyethers," published in *Fine & Specialty Chemicals*, describes the reaction of polyether amine CAD2000, methyl ethyl ketone, and hydrogen in the presence of a nickel-based catalyst to produce secondary amine polyether CASD2000. The reaction temperature is 130℃, the reaction pressure is 5MPa, the primary amine content is ≤2%, and the catalyst retains good stability and catalytic activity after 10 uses. This process involves high reaction temperature and pressure, and the use of hydrogen under high temperature and pressure places stringent requirements on the equipment. Qi Weijun et al.'s paper, "High-Efficiency Synthesis of Bis(alkyl polyoxyethylene) Secondary Amines under Normal Pressure," published in *Fine Chemicals*, avoids the high-pressure reaction conditions, but still requires the use of hydrogen at a high temperature of 200℃.

[0005] Patent CN109517160A provides a method for preparing secondary amine polyethers, using polyetheramine and n-butyl glycidyl ether as raw materials, reacting at 65-75°C for 4-6 hours in the presence of acetic acid to obtain secondary amine polyethers. The drawback of this invention is that the ring-opening rate of the epoxy groups in the product is between 92-95%, and the residual epoxy groups will slowly continue to react with the secondary amine groups. Patent CN116731306A also uses polyetheramine and epoxy compounds for preparation, and this invention's process also has the aforementioned drawback.

[0006] Patent CN118994520A uses terminal amine polyethers and aldehyde compounds in the presence of a solvent at a temperature of 100-140°C for 1-24 hours. After the reaction, the solvent is removed to obtain secondary amine polyethers. This invention uses an excess of aldehydes and a relatively large amount of solvent, which significantly affects the yield and cost.

[0007] Patent CN114316250B uses a primary amine polyether and itaconic acid ester to prepare a secondary amine resin via a Michael reaction, with a yield between 92% and 98.1%. Increasing the amount of itaconic acid ester results in a decrease in the product yield. Modified aspartic secondary amine resins prepared by patents CN114989036A, CN114989028B, CN119285939A, and CN108129637A also exhibit the aforementioned problems. Summary of the Invention

[0008] To address the problems existing in the prior art, this invention provides a method for synthesizing slow-reaction polyetheramines (secondary amine polyethers) for polyisocyanurates. This method is simple, economical, and practical.

[0009] This invention is achieved through the following technical solution:

[0010] A method for synthesizing polyisocyanurate using a slow-reaction polyetheramine includes the following steps:

[0011] S1. Under nitrogen protection, add 1.0 mol of primary amine polyether and 0.01~0.03% of metal salt catalyst (by mass of the total product) into a clean reactor.

[0012] S2. Start stirring, cool with brine, control the temperature at 10℃, slowly add 1.01~1.04 times the molar number of primary amine groups of monofunctional isocyanate, control the reaction temperature at 10~25℃, control the reaction time at 5~14h, after the reaction is completed, raise the temperature to 60~80℃, keep it at the temperature for 2~5h, then degas under vacuum for 1h, and discharge the material to obtain secondary amine polyether, which is the slow-reacting polyether amine.

[0013] The specific reaction formula is as follows:

[0014]

[0015] Wherein: R is a small molecule alcohol initiator structural group of primary amino polyether, including but not limited to methanol group, ethanol group, butanol group, octanol group, dodecyltetracool group, hexadecyltetracool group, ethylene glycol group, propylene glycol group, glycerol group, pentaerythritol group, xylitol group, sorbitol group, and sucrose group;

[0016] R' is a group of monofunctional isocyanate, such as p-chlorophenyl, octadecyl, m-tolyl, 2-chloroethyl, 3,4-dichlorophenyl ester, n-butyl, trans-4-methylcyclohexyl;

[0017] x and y are integers, x = 1~135, y = 0~45. n is the functionality of the hydroxyl group of the initiator, n = 1~8.

[0018] Preferably, the primary amino polyether is a polyether obtained by polymerizing a small molecule alcohol with propylene oxide and ethylene oxide, and then amination with liquid ammonia. Specific products include, but are not limited to, the grades CAD180, CAD230, CAD400, CAED900, CAD1000, CAD2000, CAED2000, CAM1000, CAM2070, CAM3085, CAL1000, CAB100, CAB200, CAB300, CAT403, CAT1000, CAT3000, CAT5000, CAT8000, CAJWSC8000, CAMTC8000, CASLC8000, and CAZT8000 of Yangzhou Chenhua New Materials Co., Ltd.

[0019] Preferably, the small molecule alcohols include, but are not limited to, methanol, ethanol, butanol, octanol, dodecyltetradecyl alcohol, hexadecyl alcohol, ethylene glycol, propylene glycol, glycerol, trimethylolpropane, pentaerythritol, xylitol, sorbitol, and sucrose.

[0020] Preferably, the molecular weight range of the primary amine polyether is 175 to 8250.

[0021] Preferably, the metal salt catalyst is selected from one or a mixture of metal salts such as iron, tin, lead, potassium, sodium, and bismuth, such as chelated tin, stannous octoate, dibutyltin dilaurate, di(dodecyl sulfide)dibutyltin, dibutyltin diacetate, potassium acetate, potassium oleate, ferric acetate, ferric chloride, lead acetate, potassium octoate, sodium acetate, sodium oleate, and bismuth octoate, or a mixture thereof.

[0022] Preferably, the metal salt catalyst is selected from one or a mixture of chelated tin, stannous octoate, dibutyltin dilaurate, dibutyltin diacetate, and bismuth octoate.

[0023] Preferably, the monofunctional isocyanate refers to an isocyanate whose molecular structure contains only one NCO group, including but not limited to: p-chlorophenyl isocyanate, octadecyl isocyanate, m-tolyl isocyanate, 2-chloroethyl isocyanate, 3,4-dichlorophenyl isocyanate, n-butyl isocyanate, and trans-4-methylcyclohexyl isocyanate.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention uses monofunctional isocyanate to modify primary amine polyether into secondary amine polyether to obtain the desired slow-reaction polyether amine, which contains isocyanurate structure, the same as the later polyisocyanurate (polyurea) structure, and will not cause any impact on performance.

[0026] Traditional primary amine polyethers are reacted with diethyl maleate, epoxy compounds, etc. to produce secondary amine polyethers. The molecular weight of the product will increase, the -NH2 in the original structure will be changed to -NH-, and the number of active amine hydrogens in each molecule of the product will be reduced by half.

[0027] The reaction formula between primary amine polyether and diethyl maleate is as follows:

[0028]

[0029] The reaction formula between primary amine polyethers and epoxy compounds is as follows:

[0030]

[0031] The molecular weight of the product produced by the process of this invention will also increase. However, by changing one -NH2 to two -NH- in the molecular structure through a chemical reaction, the number of active amine hydrogens in each molecular structure of the product produced by the process of this invention remains unchanged compared with the traditional process. During the downstream polyurea construction, the molar ratio of the reactive groups does not need to be adjusted, and a polyurea product with a reaction rate that is significantly slower than that of primary amino polyether can be obtained.

[0032] This invention utilizes a low-temperature, low-pressure reaction, resulting in a high yield (>99.80%) and a primary amine content of <0.80%. The process avoids flammable and explosive raw materials such as hydrogen and liquid ammonia, saving energy and ensuring safe operation. Attached Figure Description

[0033] Figure 1 The infrared spectrum of the raw material CAD2000 in Example 4 of this invention;

[0034] Figure 2 This is the infrared spectrum of product CASD2000 in Embodiment 4 of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings:

[0036] The following embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations and modifications made to the shape, structure, features, and spirit described in the claims of the present invention should be included within the scope of the claims. The primary amine polyether in the embodiments is a product manufactured by Yangzhou Chenhua New Materials Co., Ltd. The present invention will be further described below:

[0037] Example 1

[0038] Under nitrogen protection, 1.0 mol of primary amine polyether CAD180 and 0.01% of the total mass of the product metal salt catalyst chelated tin were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.01 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was controlled at 10°C. The reaction time was controlled at 6 hours. After the reaction was completed, the temperature was raised to 60°C and held for 2 hours. Then, the reactor was degassed under vacuum for 1 hour. The secondary amine polyether, namely the slow-reaction polyether amine CASD180 of this invention, was obtained.

[0039] Example 2

[0040] Under nitrogen protection, 1.0 mol of primary amine polyether CAD230 and 0.01% of the total mass of the product metal salt catalyst chelated tin were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.01 times the molar amount of primary amine polyether p-chlorophenyl isocyanate was slowly added, and the reaction temperature was controlled at 10°C. The reaction time was controlled at 5 h. After the reaction was completed, the temperature was raised to 60°C and held for 2 h. After vacuum degassing for 1 h, the secondary amine polyether was obtained, which is the slow-reaction polyether amine CASD230 of this invention.

[0041] Example 3

[0042] Under nitrogen protection, 1.0 mol of primary amine polyether CAED900 and 0.02% of the metal salt catalyst stannous octoate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. Octadecyl isocyanate (1.02 times the molar number of primary amines) was slowly added, and the reaction temperature was maintained at 14°C. The reaction time was controlled at 7 h. After the reaction was completed, the temperature was raised to 65°C and held for 3 h. Then, the reactor was degassed under vacuum for 1 h. The secondary amine polyether, namely the slow-reaction polyether amine CASED900 of this invention, was discharged.

[0043] Example 4

[0044] Under nitrogen protection, 1.0 mol of primary amine polyether CAD2000 and 0.02% of the metal salt catalyst stannous octoate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. 1.02 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was maintained at 14°C. The reaction time was controlled at 7 h. After the reaction was completed, the temperature was raised to 65°C and held for 3 h. Then, the reactor was degassed under vacuum for 1 h. The secondary amine polyether, namely the slow-reaction polyether amine CASD2000 of this invention, was discharged.

[0045] Example 5

[0046] Under nitrogen protection, 1.0 mol of primary amine polyether CAM1000 and 0.02% of the metal salt catalyst dibutyltin dilaurate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. Octadecyl isocyanate (1.03 times the molar amount of primary amine) was slowly added, and the reaction temperature was maintained at 18°C ​​for 6 hours. After the reaction was completed, the temperature was raised to 70°C and held for 2.5 hours. Then, the reactor was degassed under vacuum for 1 hour to obtain secondary amine polyether, which is the slow-reaction polyether amine CASM2000 of this invention.

[0047] Example 6

[0048] Under nitrogen protection, 1.0 mol of primary amine polyether CAM2070 and 0.03% of the metal salt catalyst dibutyltin diacetate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.03 times the molar amount of primary amine polyether m-tolyl isocyanate was slowly added dropwise, and the reaction temperature was controlled at 20°C. The reaction time was controlled at 10 h. After the reaction was completed, the temperature was raised to 75°C and held for 4 h. After vacuum degassing for 1 h, the secondary amine polyether, namely the slow-reaction polyether amine CASM2070 of this invention, was obtained.

[0049] Example 7

[0050] Under nitrogen protection, 1.0 mol of primary amine polyether CAM3085 and 0.03% of the metal salt catalyst bismuth octoate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. 1.04 times the molar amount of primary amine polyether 2-chloroethyl isocyanate was slowly added, and the reaction temperature was maintained at 25°C for 14 hours. After the reaction was completed, the temperature was raised to 75°C and held for 5 hours. Then, the reactor was degassed under vacuum for 1 hour to obtain secondary amine polyether, which is the slow-reaction polyether amine CASM3085 of this invention.

[0051] Example 8

[0052] Under nitrogen protection, 1.0 mol of primary amine polyether CAL1000, 0.01% of the total product mass of the metal salt catalyst bismuth octoate, and 0.01% of the total product mass of the metal salt catalyst stannous octoate were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.04 times the molar amount of primary amine polyether 3,4-dichlorophenyl isocyanate was slowly added, and the reaction temperature was controlled at 23°C. The reaction time was controlled at 12 h. After the reaction was completed, the temperature was raised to 80°C and held for 4 h. After vacuum degassing for 1 h, the secondary amine polyether was obtained, which is the slow-reaction polyether amine CASL1000 of this invention.

[0053] Example 9

[0054] Under nitrogen protection, 1.0 mol of primary amine polyether CAB100, 0.02% of the total product mass of the metal salt catalyst bismuth octoate, and 0.01% of the total product mass of the metal salt catalyst dibutyltin diacetate were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.01 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was controlled at 12°C. The reaction time was controlled at 6 hours. After the reaction was completed, the temperature was raised to 62°C and held for 2 hours. Then, the reactor was degassed under vacuum for 1 hour to obtain secondary amine polyether, which is the slow-reaction polyether amine CASB100 of this invention.

[0055] Example 10

[0056] Under nitrogen protection, 1.0 mol of primary amine polyether CAT403 and 0.02% of the metal salt catalyst dibutyltin diacetate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to a controlled temperature of 10°C. 1.01 times the molar amount of primary amine polyether trans-4-methylcyclohexyl isocyanate was slowly added dropwise, and the reaction temperature was controlled at 15°C. The reaction time was controlled at 8 hours. After the reaction was completed, the temperature was raised to 66°C and held for 3 hours. Then, the reactor was degassed under vacuum for 1 hour, and the secondary amine polyether, namely the slow-reaction polyether amine CAST403 of this invention, was obtained.

[0057] Example 11

[0058] Under nitrogen protection, 1.0 mol of primary amine polyether CAT3000 and 0.03% of the total mass of the product metal salt catalyst chelated tin were added to a clean reactor. Stirring was started, and the temperature was controlled at 10°C by cooling with brine. 1.03 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was controlled at 24°C. The reaction time was controlled at 14 h. After the reaction was completed, the temperature was raised to 75°C and held for 5 h. After vacuum degassing for 1 h, the secondary amine polyether was obtained, which is the slow-reaction polyether amine CAST3000 of this invention.

[0059] Example 12

[0060] Under nitrogen protection, 1.0 mol of primary amine polyether CAT8000 and 0.03% of the metal salt catalyst dibutyltin dilaurate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. Octadecyl isocyanate (1.03 times the molar amount of primary amine) was slowly added, and the reaction temperature was maintained at 25°C for 14 hours. After the reaction was completed, the temperature was raised to 80°C and held for 4 hours. Then, the reactor was degassed under vacuum for 1 hour to obtain secondary amine polyether, which is the slow-reaction polyether amine CAST8000 of this invention.

[0061] Example 13

[0062] Under nitrogen protection, 1.0 mol of primary amine polyether CAJWSC8000 and 0.03% of the total mass of the product metal salt catalyst chelated tin were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. 1.04 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was controlled at 25°C. The reaction time was controlled at 13 h. After the reaction was completed, the temperature was raised to 78°C and held for 3 h. After vacuum degassing for 1 h, the secondary amine polyether was obtained, which is the slow-reaction polyether amine CASJWSC8000 of this invention.

[0063] Example 14

[0064] Under nitrogen protection, 1.0 mol of primary amine polyether CAMTC8000 and 0.03% of the metal salt catalyst dibutyltin diacetate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to control the temperature at 10°C. Octadecyl isocyanate (1.03 times the molar number of primary amines) was slowly added, and the reaction temperature was controlled at 22°C. The reaction time was controlled at 12 h. After the reaction was completed, the temperature was raised to 75°C and held for 4 h. Then, the reactor was degassed under vacuum for 1 h. The secondary amine polyether, namely the slow-reaction polyether amine CASMTC8000 of this invention, was discharged.

[0065] Example 15

[0066] Under nitrogen protection, 1.0 mol of primary amine polyether CASLC8000 and 0.03% of the metal salt catalyst dibutyltin diacetate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. 1.02 times the molar amount of primary amine polyether 2-chloroethyl isocyanate was slowly added, and the reaction temperature was maintained at 22°C. The reaction time was controlled at 12 h. After the reaction was completed, the temperature was raised to 75°C and held for 5 h. Then, the reactor was degassed under vacuum for 1 h. The secondary amine polyether was obtained, which is the slow-reaction polyether amine CASSLC8000 of this invention.

[0067] Example 16

[0068] Under nitrogen protection, 1.0 mol of primary amine polyether CAZT8000 and 0.03% of the metal salt catalyst dibutyltin diacetate (by mass of the total product) were added to a clean reactor. Stirring was started, and the reactor was cooled with brine to maintain the temperature at 10°C. 1.03 times the molar amount of primary amine polyether n-butyl isocyanate was slowly added, and the reaction temperature was maintained at 18°C. The reaction time was controlled at 11 h. After the reaction was completed, the temperature was raised to 70°C and held for 4 h. After vacuum degassing for 1 h, the secondary amine polyether was obtained, which is the slow-reaction polyether amine CASZT8000 of this invention.

[0069] Taking Example 4 as an example, the infrared spectra of the raw material CAD2000 and the product CASD2000 are as follows: Figure 1-2As shown in the comparison spectrum, the primary amine group of CAD2000 does not have an obvious absorption peak in the spectrum. After the raw material CAD2000 is modified into CASD2000 by the present invention, a secondary amine stretching vibration peak appears at 3347 cm-1 and a secondary amine bending vibration peak appears at 1560 cm-1. The spectral structure is consistent with the target product.

[0070] The properties of the slow-reacting polyetheramines prepared according to the embodiments of the present invention are shown in the table below:

[0071] Serial Number Product brand Number of primary amino moles per mole of primary amino polyether raw material Yield / % Primary amine content / % 1 CASD180 2 99.95 0.75 2 CASD230 2 99.85 0.62 3 CASED900 2 99.88 0.36 4 CASD2000 2 99.81 0.28 5 CASM2000 1 99.82 0.22 6 CASM2070 1 99.90 0.27 7 CASM3085 1 99.86 0.21 8 CASL1000 1 99.91 0.25 9 CASB100 1 99.97 0.39 10 CAST403 3 99.96 0.58 11 CAST3000 3 99.85 0.22 12 CAST8000 3 99.84 0.23 13 CASJWSC8000 4 99.85 0.19 14 CASMTC8000 5 99.84 0.23 15 CASSLC8000 6 99.88 0.18 16 CASZT8000 8 99.89 0.20

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for synthesizing a slow-reaction polyetheramine for polyisocyanurate, characterized in that: Includes the following steps: S1. Under nitrogen protection, add 1.0 mol of primary amine polyether and 0.01~0.03% of metal salt catalyst (by mass of the total product) into a clean reactor. S2. Start stirring, cool with brine, control the temperature at 10℃, slowly add 1.01~1.04 times the molar number of primary amine groups of monofunctional isocyanate, control the reaction temperature at 10~25℃, control the reaction time at 5~14h, after the reaction is completed, raise the temperature to 60~80℃, keep it at the temperature for 2~5h, then degas under vacuum for 1h, and discharge the material to obtain secondary amine polyether, which is the slow-reacting polyether amine. The specific reaction formula is as follows: Wherein: R is a small molecule alcohol initiator structural group of primary amino polyether, including but not limited to methanol group, ethanol group, butanol group, octanol group, dodecyltetracool group, hexadecyltetracool group, ethylene glycol group, propylene glycol group, glycerol group, pentaerythritol group, xylitol group, sorbitol group, sucrose group; R' is a monofunctional isocyanate group, including but not limited to p-chlorophenyl, octadecyl, m-tolyl, 2-chloroethyl, 3,4-dichlorophenyl ester, n-butyl, and trans-4-methylcyclohexyl; x and y are integers, x = 1~135, y = 0~45, and n is the functionality of the hydroxyl group of the initiator, n = 1~8.

2. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 1, characterized in that: The primary amino polyether is a polyether obtained by polymerizing small molecule alcohols with propylene oxide and ethylene oxide, and then amination with liquid ammonia.

3. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 2, characterized in that: The small molecule alcohols include, but are not limited to, methanol, ethanol, butanol, octanol, dodecyltetradecyl alcohol, hexadecyl alcohol, ethylene glycol, propylene glycol, glycerol, trimethylolpropane, pentaerythritol, xylitol, sorbitol, and sucrose.

4. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 2, characterized in that: The molecular weight range of the primary amine polyether is 175~8250.

5. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 1, characterized in that: The metal salt catalyst is one or a mixture of metal salts such as iron, tin, lead, potassium, sodium, and bismuth.

6. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 5, characterized in that: The metal salt catalyst is one or a mixture of chelated tin, stannous octoate, dibutyltin dilaurate, di(dodecyl sulfide)dibutyltin, dibutyltin diacetate, potassium acetate, potassium oleate, ferric acetate, ferric chloride, lead acetate, potassium octoate, sodium acetate, sodium oleate, and bismuth octoate.

7. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 6, characterized in that: The metal salt catalyst is preferably one or a mixture of chelated tin, stannous octoate, dibutyltin dilaurate, dibutyltin diacetate, and bismuth octoate.

8. The method for synthesizing a slow-reaction polyetheramine for polyisocyanurate according to claim 5, characterized in that: The monofunctional isocyanate refers to an isocyanate whose molecular structure contains only one NCO group, including but not limited to p-chlorophenyl isocyanate, octadecyl isocyanate, m-tolyl isocyanate, 2-chloroethyl isocyanate, 3,4-dichlorophenyl isocyanate, n-butyl isocyanate, and trans-4-methylcyclohexyl isocyanate.

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