A Fischer-Tropsch wax emulsion and preparation method thereof

Abstract

The present application relates to a kind of fischer-tropsch wax emulsion and its preparation method, belong to wax emulsion technical field.The fischer-tropsch wax emulsion of the present application is mainly composed of water, fischer-tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine.The fischer-tropsch wax emulsion of the present application uses fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether as main emulsifier, uses fatty acid emulsifier and triethanolamine as auxiliary emulsifier, main emulsifier and auxiliary emulsifier are all environmentally friendly emulsifier, in line with the green environmental protection concept advocated now.In addition, the fischer-tropsch wax emulsion of the present application has good stability, the latex particle size in emulsion is smaller, can expand the application range of fischer-tropsch wax, and has good use convenience.The fischer-tropsch wax emulsion of the present application has faster drying speed when being used for preparing wax film.

Description

Technical Field

[0001] The invention relates to a Fischer-Tropsch wax emulsion and a preparation method thereof, belonging to the technical field of wax emulsions. Background Art

[0002] Fischer-Tropsch wax is a methylene polymer synthesized from synthesis gas or natural gas. It is primarily composed of linear, saturated, higher-carbon alkanes with a relative molecular mass of 500-1000. It features a narrow melting point range, is free of aromatics and sulfur, is non-toxic, and is safe and environmentally friendly. Currently, Fischer-Tropsch wax is primarily used in hot-melt adhesives, inks and coatings, plastics processing, PVC lubrication, polyolefin lubrication, and masterbatch dispersion. Due to its inherent limitations, Fischer-Tropsch wax is currently primarily used as an oily material. However, with increasing environmental protection requirements, water-based materials are gradually replacing oily materials as the mainstream product. Therefore, to expand its application, Fischer-Tropsch wax emulsions have been developed. Fischer-Tropsch wax emulsions are homogeneous liquids containing both wax and water. They do not require heating, melting, or dissolution in solvents. They are non-toxic, non-corrosive, have simple production processes, are easy to store, convenient to use, and are inexpensive. However, current Fischer-Tropsch wax emulsions suffer from poor stability and poor compatibility with other aqueous solutions or emulsions. To address these issues, large amounts of emulsifiers are required. For example, Chinese patent document CN 111040189 A discloses a Fischer-Tropsch wax emulsion, which includes the following components by weight percentage: 20-30% Fischer-Tropsch wax, 15-20% emulsifier, 2-6% high molecular weight amphoteric surfactant, 0.2-0.6% polyvinyl alcohol and the balance deionized water. The Fischer-Tropsch wax emulsion provided by the invention has the appearance of a milky white liquid with a blue light, is easy to emulsify and has high storage stability, and has a storage stability of more than 12 months at room temperature. However, the preparation process of the Fischer-Tropsch wax emulsion requires homemade high molecular weight amphoteric surfactant, which makes the preparation process complicated and the cost too high. In addition, the amount of emulsifier used in the Fischer-Tropsch wax emulsion is large, which not only causes excessive cost, but also causes the Fischer-Tropsch wax emulsion to dry too slowly when preparing the wax film. Summary of the Invention

[0003] The object of the present invention is to provide a Fischer-Tropsch wax emulsion, which can solve the problems of high cost and slow drying when preparing wax films caused by the high emulsifier content in the current Fischer-Tropsch wax emulsion.

[0004] Another object of the present invention is to provide a method for preparing a Fischer-Tropsch wax emulsion.

[0005] In order to achieve the above object, the technical solution adopted by the Fischer-Tropsch wax emulsion of the present invention is:

[0006] A Fischer-Tropsch wax emulsion mainly consists of water, Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine; the mass ratio of the Fischer-Tropsch wax, the fatty alcohol polyoxyethylene ether and the isomeric alcohol polyoxyethylene ether is (17-19):(6-8):(3-5); the mass ratio of the fatty acid emulsifier and the triethanolamine is 1:(0.9-1.1); the mass fraction of water in the Fischer-Tropsch wax emulsion is not less than 59%; the mass fraction of the fatty acid emulsifier in the Fischer-Tropsch wax emulsion is 0.5-1.2%; and the fatty alcohol polyoxyethylene ether has the structure shown in formula 1.

[0007]

[0008] In formula 1, R is C 10 ~C 18 alkyl; and n=2-10.

[0009] The Fischer-Tropsch wax emulsion of the present application uses the fatty alcohol polyoxyethylene ether and the isomeric alcohol polyoxyethylene ether as main emulsifiers, uses the fatty acid emulsifier and the triethanolamine as auxiliary emulsifiers, and the main emulsifiers and the auxiliary emulsifiers are both environmentally-friendly emulsifiers, which conforms to the green and environmentally-friendly concept advocated at present. In addition, the Fischer-Tropsch wax emulsion of the present application has good stability, the latex particle size in the emulsion is small, the application range of the Fischer-Tropsch wax can be expanded, and the Fischer-Tropsch wax emulsion has good use convenience. The Fischer-Tropsch wax emulsion of the present application has a faster drying speed when used for preparing a wax film.

[0010] Preferably, the fatty alcohol polyoxyethylene ether consists of AEO-3 and AEO-9. Compared with other fatty alcohol polyoxyethylene ethers, the use of AEO-3 and AEO-9 has a better hydrophilic and lipophilic effect, thereby being beneficial to the emulsification of the Fischer-Tropsch wax.

[0011] It can be understood that the chemical structure of AEO-3 is R-O-(CH2CH2O)3H (R is dodecyl), AEO-3 is a white oily substance, is easily soluble in oil and organic solvents, can be dispersed in water, and has excellent emulsifying properties; the chemical structure of AEO-9 is R-O-(CH2CH2O)9H (R is C 12 ~C 18 alkyl), and it is a hydrophilic emulsifier.

[0012] Preferably, the mass ratio of the AEO-3 and the AEO-9 is (4.5-5.5):(1.5-2.5).

[0013] Preferably, the isomeric alcohol polyoxyethylene ether is isomeric tridecanol polyoxyethylene ether. Compared with other isomeric alcohol polyoxyethylene ethers, the isomeric tridecanol polyoxyethylene ether has good emulsifying effect because its pour point is relatively low and it can still flow at about 15℃, so it is relatively convenient to use in industry.

[0014] Preferably, the isomeric tridecanol polyoxyethylene ether is E1310.

[0015] Preferably, the fatty acid emulsifier is stearic acid.

[0016] Preferably, the drop melting point of the Fischer-Tropsch wax is 85-92° C. For example, the drop melting point of the Fischer-Tropsch wax is 89.5° C. In the present invention, the drop melting point of the Fischer-Tropsch wax is determined according to the provisions of the standard GB / T 8026-2014 "Determination of Drop Melting Point of Petroleum Waxes and Petroleum Tallow".

[0017] Preferably, the mass fraction of water in the Fischer-Tropsch wax emulsion is 59% to 80%.

[0018] The technical solution adopted in the preparation method of the Fischer-Tropsch wax emulsion of the present invention is:

[0019] A method for preparing the above-mentioned Fischer-Tropsch wax emulsion comprises the following steps:

[0020] (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, and fatty acid emulsifier until the Fischer-Tropsch wax melts to obtain a mixture;

[0021] (2) adding a portion of water to the mixture obtained in step (1) and mixing to obtain a mixed solution; the temperature of the water is 95 to 100° C.; the mass of the water is greater than or equal to 1 / 3 of the amount of the formula water and less than 1 / 2 of the amount of the formula water;

[0022] (3) mixing the formulated amount of triethanolamine and the remaining amount of water to obtain a triethanolamine solution; the temperature of the water is 95 to 100° C.;

[0023] (4) adding the triethanolamine solution obtained in step (3) to the mixed solution obtained in step (2), mixing them evenly, and obtaining a Fischer-Tropsch wax emulsion.

[0024] The preparation method of the Fischer-Tropsch wax emulsion of the present invention is simple and easy to operate, and the prepared Fischer-Tropsch wax emulsion has good stability. The amount of water in step (2) is relatively small, which facilitates the oil-in-water reaction, and the amount of water used in step (3) is relatively large, which facilitates the water-in-oil reverse reaction in step (4), thereby forming a uniform and stable emulsion. Compared with the method of adding water in one step or adding the oil phase to the water phase, the two-step water addition method is easier to change phases, the emulsion particle size is smaller and more uniform, and the equipment requirements are lower.

[0025] Preferably, in step (2), the mixing is stirring; the stirring speed is 550 to 1000 r / min; and the stirring time is 15 to 40 min.

[0026] Preferably, in step (4), the mixing is performed by stirring; the stirring speed is 950 to 1500 r / min; and the stirring time is 20 to 45 min. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0028] The dropping melting point of the Fischer-Tropsch wax used in Examples 1-3 of the present invention and Comparative Examples 1-10 is 89.5°C.

[0029] 1. Specific embodiments of the Fischer-Tropsch wax emulsion of the present invention are as follows:

[0030] Example 1

[0031] The Fischer-Tropsch wax emulsion of this embodiment is composed of water, Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine; the mass ratio of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether is 18:7:4, the fatty alcohol polyoxyethylene ether is composed of AEO-3 and AEO-9 in a mass ratio of 5:2, the isomeric alcohol polyoxyethylene ether is isomeric tridecyl alcohol polyoxyethylene ether, the isomeric tridecyl alcohol polyoxyethylene ether is E1310, and the fatty acid emulsifier is stearic acid; in the Fischer-Tropsch wax emulsion of this embodiment, the mass fraction of water is 59%, and the mass fractions of the fatty acid emulsifier and triethanolamine are both 1%.

[0032] Example 2

[0033] The Fischer-Tropsch wax emulsion of this embodiment is composed of water, Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine; the mass ratio of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether is 17:8:3, the fatty alcohol polyoxyethylene ether is composed of AEO-3 and AEO-9 in a mass ratio of 4.5:2.5, the isomeric alcohol polyoxyethylene ether is isomeric tridecanol polyoxyethylene ether, the isomeric tridecanol polyoxyethylene ether is E1310, and the fatty acid emulsifier is stearic acid; in the Fischer-Tropsch wax emulsion of this embodiment, the mass fraction of water is 80%, the mass fraction of the fatty acid emulsifier is 0.5%, and the mass fraction of triethanolamine is 0.45%.

[0034] Example 3

[0035] The Fischer-Tropsch wax emulsion of this embodiment is composed of water, Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine; the mass ratio of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether is 19:6:5, the fatty alcohol polyoxyethylene ether is composed of AEO-3 and AEO-9 in a mass ratio of 5.5:1.5, the isomeric alcohol polyoxyethylene ether is isomeric tridecyl alcohol polyoxyethylene ether, the isomeric tridecyl alcohol polyoxyethylene ether is E1310, and the fatty acid emulsifier is stearic acid; in the Fischer-Tropsch wax emulsion of this embodiment, the mass fraction of water is 70%, the mass fraction of the fatty acid emulsifier is 1.2%, and the mass fraction of triethanolamine is 1.32%.

[0036] Comparative Example 1

[0037] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 2 is that the fatty alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example consists of AEO-3 and AEO-9 in a mass ratio of 4:2.5.

[0038] Comparative Example 2

[0039] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 3 is that the fatty alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example consists of AEO-3 and AEO-9 in a mass ratio of 6:1.5.

[0040] Comparative Example 3

[0041] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 2 is that the fatty alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example consists of AEO-3 and AEO-9 in a mass ratio of 4.5:3.

[0042] Comparative Example 4

[0043] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 3 is that the fatty alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example consists of AEO-3 and AEO-9 in a mass ratio of 5.5:1.

[0044] Comparative Example 5

[0045] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 2 is that the mass ratio of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example is 17:8:2.

[0046] Comparative Example 6

[0047] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 3 is that the mass ratio of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether in the Fischer-Tropsch wax emulsion of this comparative example is 19:6:6.

[0048] Comparative Example 7

[0049] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 2 is that the mass fraction of the fatty acid emulsifier in the Fischer-Tropsch wax emulsion of this comparative example is 0.3%.

[0050] Comparative Example 8

[0051] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 3 is that the mass fraction of the fatty acid emulsifier in the Fischer-Tropsch wax emulsion of this comparative example is 1.4%.

[0052] Comparative Example 9

[0053] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 2 is that the mass fraction of triethanolamine in the Fischer-Tropsch wax emulsion of this comparative example is 0.3%.

[0054] Comparative Example 10

[0055] The only difference between the Fischer-Tropsch wax emulsion of this comparative example and the Fischer-Tropsch wax emulsion of Example 3 is that the mass fraction of triethanolamine in the Fischer-Tropsch wax emulsion of this comparative example is 1.5%.

[0056] The Fischer-Tropsch wax emulsions of Comparative Examples 1, 3, 5, 7, and 9 were prepared by a method comprising the following steps:

[0057] (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, AEO-3, AEO-9, isomeric tridecanol polyoxyethylene ether, and stearic acid until the Fischer-Tropsch wax melts to obtain a mixture;

[0058] (2) adding a portion of water (temperature of 95° C.) to the mixture obtained in step (1), stirring at a speed of 800 r / min for 30 min to obtain a mixed solution; the amount of water in this step is 3 / 8 of the water amount in the formula;

[0059] (3) mixing the formulated amount of triethanolamine and the remaining amount of water (temperature is 95° C.) to obtain a triethanolamine solution;

[0060] (4) adding the triethanolamine solution obtained in step (3) to the mixed solution obtained in step (2), stirring at a speed of 1200 r / min for 30 min to obtain a Fischer-Tropsch wax emulsion;

[0061] The Fischer-Tropsch wax emulsions of Comparative Examples 2, 4, 6, 8 and 10 were prepared by a method comprising the following steps:

[0062] (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, AEO-3, AEO-9, isomeric tridecanol polyoxyethylene ether, and stearic acid until the Fischer-Tropsch wax melts to obtain a mixture;

[0063] (2) adding a portion of water (temperature of 100° C.) to the mixture obtained in step (1), stirring at a speed of 1000 r / min for 40 min to obtain a mixed solution; the amount of water in this step is 5 / 12 of the water amount in the formula;

[0064] (3) mixing the formulated amount of triethanolamine and the remaining amount of water (temperature is 100° C.) to obtain a triethanolamine solution;

[0065] (4) adding the triethanolamine solution obtained in step (3) to the mixed solution obtained in step (2), stirring at a speed of 1500 r / min for 45 minutes to obtain a Fischer-Tropsch wax emulsion.

[0066] 2. The specific embodiment of the preparation method of the Fischer-Tropsch wax emulsion of the present invention is as follows:

[0067] Example 4

[0068] The preparation method of the Fischer-Tropsch wax emulsion of this embodiment is the preparation method of the Fischer-Tropsch wax emulsion of Example 1, and specifically comprises the following steps:

[0069] (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, AEO-3, AEO-9, isomeric tridecanol polyoxyethylene ether, and stearic acid until the Fischer-Tropsch wax melts to obtain a mixture;

[0070] (2) adding a portion of water (temperature of 98°C) to the mixture obtained in step (1), stirring at a speed of 550 r / min for 20 min to obtain a mixed solution; the amount of water in this step is 1 / 3 of the water in the formula;

[0071] (3) mixing the formulated amount of triethanolamine and the remaining amount of water (temperature is 98° C.) to obtain a triethanolamine solution;

[0072] (4) adding the triethanolamine solution obtained in step (3) to the mixed solution obtained in step (2), stirring at a speed of 950 r / min for 25 min to obtain a Fischer-Tropsch wax emulsion;

[0073] Example 5

[0074] The preparation method of the Fischer-Tropsch wax emulsion of this embodiment is the preparation method of the Fischer-Tropsch wax emulsion of Example 2, and specifically comprises the following steps:

[0075] (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, AEO-3, AEO-9, isomeric tridecanol polyoxyethylene ether, and stearic acid until the Fischer-Tropsch wax melts to obtain a mixture;

[0076] (2) adding a portion of water (temperature of 95° C.) to the mixture obtained in step (1), stirring at a speed of 800 r / min for 30 min to obtain a mixed solution; the amount of water in this step is 3 / 8 of the water amount in the formula;

[0077] (3) mixed triethanolamine and the rest of water (temperature is 95℃) to obtain triethanolamine solution;

[0078] (4) added triethanolamine solution obtained in step (3) into the mixture obtained in step (2) and stirred at 1200r / min for 30min to obtain Fischer-Tropsch wax emulsion.

[0079] Example 6

[0080] The preparation method of Fischer-Tropsch wax emulsion in this example is the preparation method of Fischer-Tropsch wax emulsion in example 3, which specifically includes the following steps:

[0081] (1) mixed Fischer-Tropsch wax, AEO-3, AEO-9, isomeric tridecanol polyoxyethylene ether and stearic acid in formula amount and heated until Fischer-Tropsch wax melted to obtain mixture;

[0082] (2) added part of water (temperature is 100℃) into the mixture obtained in step (1) and stirred at 1000r / min for 40min to obtain mixture; the amount of water in this step is 5 / 12 of formula water amount;

[0083] (3) mixed triethanolamine and the rest of water (temperature is 100℃) to obtain triethanolamine solution;

[0084] (4) added triethanolamine solution obtained in step (3) into the mixture obtained in step (2) and stirred at 1500r / min for 45min to obtain Fischer-Tropsch wax emulsion.

[0085] Experimental example 1

[0086] In order to evaluate the emulsification effect of different emulsifiers on Fischer-Tropsch wax, Fischer-Tropsch wax emulsion was prepared according to the preparation method of Fischer-Tropsch wax emulsion in example 1 by using NP-7 (nonyl phenol polyoxyethylene ether), AEO-3 and E1310 in combination or using lipophilic emulsifier S-80 (sorbitan fatty acid ester), hydrophilic emulsifier T-80 (polyoxyethylene sorbitan monooleate) and E1310 in combination, when the mass ratio of Fischer-Tropsch wax, NP-7, AEO-3 and E1310 is (17-19):(4-6):(1-3):(3-5) or the mass ratio of Fischer-Tropsch wax, S-80, T-80 and E1310 is (17-19):(4-6):(1-3):(3-5), and when the mass fraction of water in Fischer-Tropsch wax emulsion is 55-80%, the mass fraction of stearic acid and triethanolamine is 1%, the standing time of Fischer-Tropsch wax emulsion is 7d, and stratification phenomenon occurs. It is indicated that there is a problem of poor emulsification effect when NP-7 (nonyl phenol polyoxyethylene ether), AEO-3 and E1310 are used in combination or S-80, T-80 and E1310 are used in combination.

[0087] Experimental Example 2

[0088] In order to evaluate the basic properties of the Fischer-Tropsch wax emulsions of Examples 1-3 and Comparative Examples 1-10, the appearance of each Fischer-Tropsch wax emulsion was observed and recorded, and the stability of each Fischer-Tropsch wax emulsion was determined. The stability of the Fischer-Tropsch wax emulsion included storage stability, centrifugal stability and cold-heat cycle stability.

[0089] The test method for storage stability included the following steps: the Fischer-Tropsch wax emulsion was placed at room temperature (about 10-30°C) for 6 months, and then the appearance of the emulsion was observed and visually evaluated (the level evaluation standard for emulsion stability was in accordance with the provisions in the standard GBT 11543-2008). Since the storage stability test time was relatively long, for the Fischer-Tropsch wax emulsion which showed layering and other phenomena in a short time, the test was terminated when the layering and other phenomena occurred.

[0090] The test method for centrifugal stability included the following steps: the Fischer-Tropsch wax emulsion was centrifuged at a centrifugal speed of 4000 r / min for 10 min, and then the appearance of the emulsion was observed and visually evaluated (the level evaluation standard for emulsion stability was in accordance with the provisions in the standard GBT 11543-2008).

[0091] The test method for cold-heat cycle stability included the following steps: the Fischer-Tropsch wax emulsion was placed at -10°C for 16 h and then continued to be placed at 23°C for 8 h, as one cold-heat cycle, and the change in the state of the emulsion (demulsification, coagulation, flocculation or separation) was observed. If the emulsion did not change, the above cold-heat cycle operation was repeated 5 times, and the number of cycles of gel-thaw was used to represent the cold-heat cycle stability.

[0092] In order to save test time, the centrifugal stability and cold-heat cycle stability tests were not performed for some Fischer-Tropsch wax emulsions which showed layering in a short time. During the storage stability test, the Fischer-Tropsch wax emulsion of Comparative Example 2 was layered after 1 h, with a yellow water layer at the bottom and a white waxy substance at the top; the Fischer-Tropsch wax emulsion of Comparative Example 3 was layered after 1 h; the Fischer-Tropsch wax emulsions of Comparative Examples 4-5 and Comparative Example 9 were not completely emulsified, and the storage stability was not tested; the Fischer-Tropsch wax emulsion of Comparative Example 6 had a small amount of water separation after 2 h, and the water layer was about 1 mm thick after one day; and the storage stability of the Fischer-Tropsch wax emulsions of Comparative Example 1 and Comparative Example 7 was relatively poor, and the cold-heat cycle stability was not tested.

[0093] The experimental results are shown in Table 1.

[0094] Table 1 Appearance and stability of the Fischer-Tropsch wax emulsions of Examples 1-3 and Comparative Examples 1-10

[0095]

[0096]

[0097] Note: In Table 1, "-" means that the corresponding test was not performed.

[0098] The results show that the appearance and stability of the Fischer-Tropsch wax emulsions of Examples 1-3 are good.

[0099] Experimental Example 3

[0100] The average particle size of the emulsion particles in the Fischer-Tropsch wax emulsions of Examples 1-3 and Comparative Examples 1-10 was determined using a laser particle size analyzer; the dispersibility of the Fischer-Tropsch wax emulsions of Examples 1-3 and Comparative Examples 1-10 was determined according to the following method: the Fischer-Tropsch wax emulsion was dropped into water, and the dispersibility grade was visually evaluated (Grade 1: the wax emulsion was dropped into water, and large particles floated, and almost no emulsification occurred; Grade 2: the wax emulsion was dropped into water, and white particles floated on the water surface, and after stirring, the emulsion became milky white and opaque; Grade 3: the wax emulsion was dropped into water, and white cloud-like dispersion liquid was formed, and after stirring, the emulsion became milky white with a slight fluorescence; Grade 4: the wax emulsion was dropped into water, and rapidly dispersed to form a cloud-like dispersion liquid with blue fluorescence, and after stirring, a pale transparent solution was obtained). Since the Fischer-Tropsch wax emulsions of Comparative Examples 2-6 and Comparative Example 9 had problems such as incomplete emulsification or poor stability, no particle size determination was performed. The experimental results are shown in Table 2.

[0101] Table 2 Average particle size of emulsion particles in the Fischer-Tropsch wax emulsions of Examples 1-3 and Comparative Examples 1-10 and dispersibility of the Fischer-Tropsch wax emulsions

[0102]

[0103]

[0104] Note: In Table 2, "-" means that the corresponding test was not performed.

[0105] The results show that the particle size of the emulsion particles in the Fischer-Tropsch wax emulsions of Examples 1-3 is small, and the dispersibility is good.

Claims

1. A Fischer-Tropsch wax emulsion, characterized in that The invention mainly consists of water, Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, fatty acid emulsifier and triethanolamine; the mass ratio of the Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether and isomeric alcohol polyoxyethylene ether is (17-19):(6-8):(3-5); the mass ratio of the fatty acid emulsifier to triethanolamine is 1:(0.9-1.1); the mass fraction of water in the Fischer-Tropsch wax emulsion is not less than 59%; the mass fraction of the fatty acid emulsifier in the Fischer-Tropsch wax emulsion is 0.5-1.2%; the fatty alcohol polyoxyethylene ether is composed of AEO-3 and AEO-9 in a mass ratio of (4.5-5.5):(1.5-2.5).

2. The Fischer-Tropsch wax emulsion according to claim 1, wherein The isomeric alcohol polyoxyethylene ether is isomeric tridecanol polyoxyethylene ether.

3. The Fischer-Tropsch wax emulsion according to claim 2, wherein The isomeric tridecanol polyoxyethylene ether is E1310.

4. The Fischer-Tropsch wax emulsion according to claim 1, wherein The fatty acid emulsifier is stearic acid.

5. The Fischer-Tropsch wax emulsion according to any one of claims 1 to 4, wherein The drop melting point of the Fischer-Tropsch wax is 85-92°C.

6. A method for preparing a Fischer-Tropsch wax emulsion according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) heating and mixing the formulated amounts of Fischer-Tropsch wax, fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, and fatty acid emulsifier until the Fischer-Tropsch wax melts to obtain a mixture; (2) adding a portion of water to the mixture obtained in step (1) and mixing to obtain a mixed solution; the temperature of the water is 95 to 100° C.; the mass of the water is greater than or equal to 1 / 3 of the amount of the formula water and less than 1 / 2 of the amount of the formula water; (3) mixing the formulated amount of triethanolamine and the remaining amount of water to obtain a triethanolamine solution; the temperature of the water is 95 to 100° C.; (4) adding the triethanolamine solution obtained in step (3) to the mixed solution obtained in step (2), mixing them evenly, and obtaining a Fischer-Tropsch wax emulsion.

7. The method for preparing the Fischer-Tropsch wax emulsion according to claim 6, wherein: In step (2), the mixing is stirring; the stirring speed is 550 to 1000 r / min; and the stirring time is 15 to 40 minutes.

8. The method for preparing the Fischer-Tropsch wax emulsion according to claim 6, wherein: In step (4), the mixing is performed by stirring; the stirring speed is 950 to 1500 r / min; and the stirring time is 20 to 45 min.

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