Synthesis method of fatty amine polyoxyethylene ether
By introducing aluminum compounds as co-catalysts in the synthesis of fatty amine polyoxyethylene ethers, the problem of deep color in existing technologies has been solved, and the synthesized fatty amine polyoxyethylene ethers have a lighter color, making them suitable for high-end applications.
Patent Information
- Application Number
- CN202511320600.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2025-12-02
AI Technical Summary
The fatty amine polyoxyethylene ethers prepared in the prior art have the problem of deep color, which limits their application in high-end fields.
Material A is obtained by reacting aliphatic amines with ethylene oxide in the absence of an external catalyst. The reaction is then continued in the presence of a strong alkali metal and a metal-additive compound (such as an aluminum or zinc compound). The use of an aluminum compound is preferred to further reduce the color.
The fatty amine polyoxyethylene ether synthesized by this method has lower color, meeting the requirements of high-end applications.
Abstract
Description
Technical Field
[0001] This invention relates to a method for synthesizing fatty amine polyoxyethylene ethers. Background Technology
[0002] Fatty amine polyoxyethylene ethers are an important class of nonionic surfactants. From a molecular structure perspective, they consist of three key components: aliphatic alkyl groups, nitrogen atoms, and polyoxyethylene ether chains. Due to the characteristics of the nitrogen atom, the type of fatty amine polyoxyethylene ether changes with the environment: under acidic conditions, it is cationic; in neutral or alkaline environments, it is nonionic. Its structure, containing both hydrophobic fatty alkyl groups and hydrophilic polyoxyethylene ethers, makes it widely used in the textile industry as a leveling agent in acidic metal complex dyes, neutral dyes, and vat dyes, reducing the amount of sulfuric acid used in the dyeing process and improving dyeing uniformity. In viscose fiber production, it can further improve fiber strength and processing performance. It is also used in electroplating processes, pesticide emulsification, paper lubrication, and daily chemical products. However, fatty amine polyoxyethylene ethers prepared by existing methods have a relatively dark color, limiting their application in high-end fields. Summary of the Invention
[0003] One of the technical problems to be solved by the present invention is that the fatty amine polyoxyethylene ethers prepared in the prior art have a deep color. The present invention provides a new method for synthesizing fatty amine polyoxyethylene ethers, and the fatty amine polyoxyethylene ethers synthesized by the method have a light color.
[0004] To solve one of the above-mentioned technical problems, the technical solution of the present invention is as follows:
[0005] The synthesis method of fatty amine polyoxyethylene ether includes the following steps:
[0006] Step A: In the absence of an external catalyst, aliphatic amines react with ethylene oxide to obtain material A;
[0007] Step B: Material A continues to react with ethylene oxide in the presence of a catalyst to obtain aliphatic amine polyoxyethylene ether;
[0008] The catalyst, by weight, comprises the following components:
[0009] (1) Strong base containing alkali metal, 10 parts;
[0010] (2) Additive metal compounds, calculated as auxiliary metal hydroxides, are greater than 0 and less than 5 parts;
[0011] The auxiliary metal is aluminum or zinc.
[0012] We found that, in existing strong base catalysts, the introduction of the aforementioned auxiliary metal compound for the preparation of fatty amine polyoxyethylene ethers resulted in fatty amine polyoxyethylene ether products with lower color intensity, and the aluminum compound was significantly more effective than the zinc compound.
[0013] In the above and technical solutions, preferably, the alkali metal in the strong alkali containing alkali metal is potassium or sodium.
[0014] In the above and technical solutions, preferably, the strong alkali containing alkali metal includes at least one substance selected from the group consisting of alkali metal oxides, alkali metal hydroxides and alkali metal alkoxides.
[0015] In the above and technical solutions, preferably, the alkali metal alkoxide is an alkali metal methanol salt or an alkali metal ethanol salt.
[0016] By way of non-limiting example only, the amount of the auxiliary metal compound, calculated as the auxiliary metal hydroxide, is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, etc., more preferably 0.5 to 5.
[0017] More notably, when aluminum and zinc compounds are used simultaneously, the two compounds have a synergistic effect in reducing color intensity. For example, when aluminum and zinc compounds are used together, the aluminum compound is calculated as aluminum hydroxide and the zinc compound as zinc hydroxide, with a weight ratio of zinc compound to aluminum compound of 0.1–0.6. More specific examples of weight ratios include 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.50, 0.55, etc.
[0018] There are no particular restrictions on how the catalyst is added in step B. It can be simply mixed and then added to step B; or it can be added to the reaction system in step B according to the required components and amounts of the catalyst, and the order in which the catalyst is added to step B has no significant effect.
[0019] In the above-mentioned technical solutions, preferably, in step A, the molar ratio of the amount of ethylene oxide reacted to the molar ratio of the -NH bonds in the aliphatic amine is greater than 0 and less than 1.02. For example, but not limited to, the molar ratio of the amount of ethylene oxide reacted to the molar ratio of the -NH bonds in the aliphatic amine is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.01, etc.
[0020] In the above and technical solutions, preferably, the sum of the reaction amounts of ethylene oxide in steps A and B, per mole of -NH bond, is 2 to 10 moles, for example, but not limited to 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, etc., more preferably 2.5 to 9 moles.
[0021] In the above and technical solutions, preferably, the reaction temperature of step A is 90-180°C, for example, but not limited to 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, more preferably 100-170°C, even more preferably 110-160°C, even more preferably 120-145°C, and most preferably 120-145°C.
[0022] In the above and technical solutions, preferably, the reaction pressure in step A is -0.05MPa to 0.5MPa, such as but not limited to -0.04MPa, -0.03MPa, -0.02MPa, -0.01MPa, 0MPa, 0.05MPa, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, etc., and more preferably 0.1MPa to 0.4MPa.
[0023] In the above technical solution, the preferred reaction temperature for step B is 110–170°C, for example, but not limited to, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, etc. A further preferred reaction temperature is 120–160°C.
[0024] In the above and technical solutions, preferably, the reaction pressure in step B is -0.05MPa to 0.5MPa, for example, but not limited to, the reaction pressure in step B is -0.04MPa, -0.03MPa, -0.02MPa, -0.01MPa, 0MPa, 0.01MPa, 0.02MPa, 0.03MPa, 0.04MPa, 0.06MPa, 0.08MPa, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, etc., and more preferably 0.1MPa to 0.4MPa.
[0025] All pressures in this invention are gauge pressures.
[0026] In the above technical solution, the preferred aliphatic amine is C8-C9. 18 Aliphatic amines, specifically, the aliphatic amines used are selected from C8 aliphatic amines, C9 aliphatic amines, and C... 10 Aliphatic amines, C 11 Aliphatic amines, C 12 Aliphatic amines, C 13Aliphatic amines, C 14 Aliphatic amines, C 15 Aliphatic amines, C 16 Aliphatic amines, C 17 Aliphatic amines and C 18 At least one of the substances in the group consisting of aliphatic amines.
[0027] In the above technical solution, the aliphatic amine is preferably a primary amine.
[0028] In the above technical solutions, there are no special limitations on whether the aliphatic amine is straight-chain or branched, and both can achieve comparable technical effects. To ensure consistency in comparison, straight-chain aliphatic amines are used in the specific embodiments and comparative examples of this invention.
[0029] In the above technical solution, the aliphatic amine can be a saturated aliphatic amine or an unsaturated aliphatic amine; however, for the same reason, saturated aliphatic amines are used.
[0030] In the above technical solution, based on the theoretical total product mass, the preferred catalyst dosage in step B is 0.05% to 1%. Examples include, but are not limited to, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, etc., with a further preferred dosage of 0.1% to 0.5%.
[0031] In a specific embodiment of the present invention, the color of the product is measured using the method of GB / T 22295-2008 ("Test Method for Color of Transparent Liquids (Gardner Colorimetry)").
[0032] The present invention will be further described below with reference to various embodiments. Detailed Implementation
[0033]
Comparative Example 1
[0034] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0035] Second stage of reaction: 2.0g of potassium hydroxide was added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was started, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09MPa for 60 minutes, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3MPa by controlling the ethylene oxide feed rate. When a total of 522g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09MPa for 30 minutes. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0036] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 9+.
[0037] [Comparative Example 2]
[0038] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0039] Second stage of reaction: 3.0 kJ of potassium hydroxide was added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was started, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 522 g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0040] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 9-.
[0041] [Comparative Example 3]
[0042] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0043] Second stage of reaction: 4.0g of potassium hydroxide was added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was started, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09MPa for 60 minutes, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3MPa by controlling the ethylene oxide feed rate. When a total of 522g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09MPa for 30 minutes. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0044] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 8+.
[0045]
Example 1
[0046] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0047] Second stage of reaction: 3.0 g of potassium hydroxide and 0.80 g of aluminum hydroxide were added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced and maintained at this temperature. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 522 g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0048] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 3.
[0049]
Example 2
[0050] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0051] Second stage of reaction: 3.0 g of potassium hydroxide and 0.80 g of zinc hydroxide were added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 90°C, and vacuum treatment was carried out at -0.09 MPa for 60 min. Then the temperature was raised to 140°C, ethylene oxide was introduced and maintained at this temperature. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 522 g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0052] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 4-.
[0053]
Example 3
[0054] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0055] Second stage of reaction: 3.0 g potassium hydroxide, 0.10 g zinc hydroxide, and 0.70 g aluminum hydroxide were added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 522 g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0056] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 1+.
[0057]
Example 4
[0058] First stage of the reaction: 400.0 g (1.48 mol) of octadecylamine was added to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooled coil), and the reactor was sealed. The reactor was purged with nitrogen three times, the stirrer was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 130 g (2.95 mol) of ethylene oxide had been introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was complete), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 70°C.
[0059] Second stage of reaction: 3.0g potassium hydroxide, 0.15g zinc hydroxide, and 0.65g aluminum hydroxide were added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was turned on, and the temperature was raised to 90℃. Vacuum treatment was carried out at -0.09MPa for 60min, then the temperature was raised to 140℃, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3MPa by controlling the ethylene oxide feed rate. When a total of 522g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140℃ until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09MPa for 30min. Then the temperature was lowered to 60℃ to obtain the octadecylamine polyoxyethylene ether product.
[0060] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 1-.
[0061]
Example 5
[0062] The first stage involves adding 400.0 g (1.48 mol) of octadecylamine to a 2L reactor (equipped with a stirrer, an electric heating jacket, and an internal water-cooling coil) and sealing the reactor. The reactor is then purged with nitrogen three times. The stirrer is turned on and the temperature is raised to 90°C. Vacuum treatment is then carried out at -0.09 MPa for 60 min. The temperature is then raised to 140°C, and ethylene oxide is introduced and maintained at this temperature. The reaction pressure is kept at 0.3 MPa by controlling the ethylene oxide feed rate. Feeding is stopped when a total of 130 g (2.95 mol) of ethylene oxide has been introduced. A ripening reaction is carried out at 140°C until the pressure no longer decreases (indicating the ripening reaction is complete). Vacuum treatment is then carried out at -0.09 MPa for 30 min, and the temperature is then lowered to 70°C.
[0063] Second stage of reaction: 3.0 g potassium hydroxide, 0.30 g zinc hydroxide, and 0.50 g aluminum hydroxide were added to the reactor after the first stage, and the reactor was sealed. The reactor was purged with nitrogen three times, the stirring was turned on, and the temperature was raised to 90°C. Vacuum treatment was carried out at -0.09 MPa for 60 min, then the temperature was raised to 140°C, ethylene oxide was introduced, and this temperature was maintained. The reaction pressure was maintained at 0.3 MPa by controlling the ethylene oxide feed rate. When a total of 522 g (11.85 mol) of ethylene oxide was introduced, the feed was stopped. The ripening reaction was carried out at 140°C until the pressure no longer dropped (indicating that the ripening reaction was completed), and vacuum treatment was carried out at -0.09 MPa for 30 min. Then the temperature was lowered to 60°C to obtain the octadecylamine polyoxyethylene ether product.
[0064] Analysis and testing showed that the color (Gardner color) value of the fatty amine polyoxyethylene ether product was 2.
Claims
1. A method for synthesizing fatty amine polyoxyethylene ethers, comprising the following steps: Step A: In the absence of an external catalyst, aliphatic amines react with ethylene oxide to obtain material A; Step B: Material A continues to react with ethylene oxide in the presence of a catalyst to obtain aliphatic amine polyoxyethylene ether; in, The catalyst, by weight, comprises the following components: (1) Strong base containing alkali metal, 10 parts; (2) Additive metal compounds, calculated as auxiliary metal hydroxides, are greater than 0 and less than 5 parts; The auxiliary metal is aluminum or zinc.
2. The synthesis method according to claim 1, characterized in that: The alkali metal mentioned in the strong alkali containing alkali metal is potassium or sodium.
3. The synthesis method according to claim 1, characterized in that: The strong base containing alkali metal includes at least one substance selected from the group consisting of alkali metal oxides, alkali metal hydroxides, and alkali metal alkoxides.
4. The synthesis method according to claim 1, characterized in that: The alkali metal alkoxide is an alkali metal methanol salt or an alkali metal ethanol salt.
5. The synthesis method according to claim 1, characterized in that: In step A, the molar ratio of the amount of ethylene oxide reacted to the molar ratio of the -NH bond in the aliphatic amine is greater than 0 and less than 1.
02.
6. The synthesis method according to claim 1, characterized in that: The sum of the amounts of ethylene oxide reacted in steps A and B, per mole of -NH bond, is 2 to 10 moles, more preferably 2.5 to 9 moles.
7. The synthesis method according to claim 1, characterized in that: The reaction temperature in step A is 90–180°C, preferably 100–170°C, more preferably 110–160°C, even more preferably 120–145°C, and most preferably 120–145°C. And / or preferably, the reaction pressure in step A is -0.05 MPa to 0.5 MPa, preferably 0.1 MPa to 0.4 MPa.
8. The synthesis method according to claim 1, characterized in that: The reaction temperature in step B is 110–170°C, more preferably 120–160°C. And / or the reaction pressure is preferably -0.05 MPa to 0.5 MPa, more preferably 0.1 MPa to 0.4 MPa.
9. The synthesis method according to claim 1, characterized in that: The aliphatic amine is C8-C9. 18 Aliphatic amines; and / or preferably, the aliphatic amines are primary amines.
10. The synthesis method according to claim 1, characterized in that: Based on the theoretical total product mass, the catalyst dosage in step B is calculated to be 0.05%–1%. More preferably, the catalyst dosage is 0.1%–0.5%.