Wax emulsion prepared by adopting reversed-phase emulsification method and preparation method of wax emulsion

Abstract

The invention relates to the technical field of wax emulsion, and discloses wax emulsion prepared by adopting a reversed-phase emulsification method and a preparation method of the wax emulsion. The preparation method comprises the following steps: S1, melting a certain amount of carnauba wax, a nonionic surfactant such as tween-80, an anionic surfactant such as fatty alcohol ether sulfate (FES-77), sodium dioctyl sulfosuccinate (OT-75) and sodium hydroxide according to a certain proportion at a high temperature to prepare a mixture; s2, dropwise adding a certain amount of high-temperature distilled water at a certain speed while stirring, and stirring the obtained mixture at high temperature for 30 minutes to prepare O / W emulsion; according to the wax emulsion prepared by adopting the reversed-phase emulsification method and the preparation method thereof, the prepared carnauba wax emulsion has relatively good stability, the particle size of emulsion particles in the emulsion is relatively small, the application range of carnauba wax can be expanded, and the carnauba wax emulsion has relatively good use convenience, so that the carnauba wax emulsion has relatively good application prospects. The wax emulsion produced by adopting the polymerization emulsification method can be widely applied to colored powdered ink.

Description

Technical Field

[0001] The invention relates to the technical field of wax emulsions, in particular to an oil-in-water type carnauba wax emulsion, specifically a wax emulsion prepared by an inverse emulsification method and a preparation method thereof. Background Art

[0002] During the preparation process, the water-in-oil wax emulsion needs to rely on the surface activity of the emulsifier and under the action of a certain mechanical external force, so that the wax with a higher melting point is evenly and stably dispersed in the water in the form of nano droplets; this wax emulsion is milky white and has the characteristics of good film-forming properties, fine texture, smooth and translucent surface. Compared with solvent-based products, it is greener, more harmless, environmentally friendly and economical, has good practicality and application prospects, and is widely used in industrial fields such as toner, leather, coatings, and papermaking.

[0003] The most critical factor in the preparation of water-in-oil wax emulsions is the coordination of the hydrophilic and lipophilic groups of the emulsifier, which ensures good affinity with the oily wax while ensuring that it is soluble in water to form a stable wax emulsion. Therefore, the selection of the hydrophilic-lipophilic balance (HLB value) of the emulsifier is key. Secondly, after determining the emulsifier, the effects of factors such as the amount of emulsifier added and the emulsification temperature on the performance of the wax emulsion must also be considered.

[0004] The preparation of water-based wax emulsions has been reported so far, and the emulsifiers used are generally glyceryl monostearate (GMS), alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, etc. These emulsifiers are used in large amounts and the stability of the wax emulsion is poor. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a wax emulsion prepared by an inverse emulsification method and a preparation method thereof, which has the advantages of stable effect and convenient use, and solves the problem of poor stability.

[0006] (II) Technical solution In order to achieve the above-mentioned purpose of stability and convenient use, the present invention provides the following technical scheme: a wax emulsion prepared by an inverse emulsification method, comprising the following raw material components: 3.0-10 kg of water, 1-5 kg ​​of carnauba wax, 20-90 g of a composite emulsifier, 50-500 g of Tween-80, 20-90 g of a fatty alcohol ether sulfate, 20-90 g of dioctyl sodium sulfosuccinate, 20-90 g of sodium hydroxide and an appropriate amount of alkali.

[0007] Preferably, the mass ratio of the carnauba wax, Tween-80, fatty alcohol ether sulfate, dioctyl sodium sulfosuccinate, and sodium hydroxide is (100-200): (10-20): (2.5-7): (2.5-7): (0.3-0.6).

[0008] Preferably, the mass fraction of water in the entire wax emulsion is not less than 65% to 80%; the mass fraction of fatty alcohol ether sulfate in the entire wax emulsion is 2.5 to 5.5%.

[0009] Preferably, the mass fraction of dioctyl sodium sulfosuccinate in the entire wax emulsion is 2.5-6.5%.

[0010] Another technical problem to be solved by the present invention is to provide a method for preparing a wax emulsion by using an inverse emulsification method, comprising the following steps: S1, putting the formulated amount of carnauba wax, Tween-80, fatty alcohol ether sulfate, dioctyl sodium sulfosuccinate, sodium hydroxide and an appropriate amount of alkali into a stirring device, and fully heating and stirring, and after the carnauba wax is stirred and melted, a mixture is obtained; S2. Add the formulated amount of water to the mixture obtained in step S1, and put them into a mixing device for thorough mixing. During the process, a certain amount of high-temperature distilled water is added dropwise at a certain speed to obtain a mixed solution, i.e., an O / W emulsion.

[0011] Preferably, the rotation speed of the stirring device in step S1 is 450-1000 r / min, and the water temperature when adding water in step S2 is 95-100°C.

[0012] Preferably, in the stirring and mixing equipment in step S1 and step S2, a heat preservation stirring and mixing method is adopted, and the heat preservation temperature is 95°C~100°C, and the heat preservation stirring time is 20~45min. After the stirring and mixing is completed, the temperature is lowered and stirred at a constant stirring speed until it drops to room temperature.

[0013] (III) Beneficial effects Compared with the prior art, the present invention provides a wax emulsion prepared by an inverse emulsification method and a preparation method thereof, which has the following beneficial effects: The wax emulsion prepared by the reverse emulsification method and the preparation method thereof, by selecting Tween-80 as the main emulsifier, and selecting fatty alcohol ether sulfate (FES-77) and dioctyl sodium sulfosuccinate (OT-75) as auxiliary emulsifiers, the main emulsifier and the auxiliary emulsifier are both environmentally friendly emulsifiers, which conform to the green environmental protection concept currently advocated, and the prepared carnauba wax emulsion has good stability, and the latex particles in the emulsion have a small particle size, which can expand the application range of carnauba wax and has good convenience in use. Therefore, the wax emulsion produced by this type of polymerization emulsification method can be widely used in color toner. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: Preparation of wax emulsion with 15% solid content: Select 1 kg of carnauba wax, 50 g of Tween-80, 25 g of FES-77 (fatty alcohol ether sulfate), 25 g of OT-75 (sodium dioctyl sulfosuccinate), and 3 g of sodium hydroxide, mix them, heat them to above 95°C, when the carnauba wax is completely melted, add 6.0 kg of distilled water above 95°C, after adding, keep stirring at above 95°C for 30 minutes, then cool to room temperature with stirring to obtain a wax emulsion with a solid content of 15%.

[0016] Embodiment 2: Preparation of wax emulsion with 18% solid content: Select 1 kg of carnauba wax, 70 g of Tween-80, 30 g of FES-77 (fatty alcohol ether sulfate), 30 g of OT-75 (dioctyl sodium sulfosuccinate), and 3 g of sodium hydroxide, mix them, heat them to above 95°C, when the carnauba wax is completely melted, add 5.5 kg of distilled water above 95°C, after adding, keep stirring at above 95°C for 30 minutes, then cool to room temperature with stirring to obtain a wax emulsion with a solid content of 18%.

[0017] Embodiment three: Preparation of wax emulsion with 20% solid content: Select 1 kg of carnauba wax, 90 g of Tween-80, 32 g of FES-77 (fatty alcohol ether sulfate), 32 g of OT-75 (dioctyl sodium sulfosuccinate), and 3 g of sodium hydroxide, mix them, heat them to above 95°C, when the carnauba wax is completely melted, add 5.0 kg of distilled water above 95°C, after adding, keep stirring at above 95°C for 30 minutes, then cool to room temperature with stirring to obtain a wax emulsion with a solid content of 20%.

[0018] Embodiment 4: Preparation of wax emulsion with 23% solid content: Select 1 kg of carnauba wax, 100 g of Tween-80, 35 g of FES-77 (fatty alcohol ether sulfate), 35 g of OT-75 (sodium dioctyl sulfosuccinate), and 3 g of sodium hydroxide, mix them, heat them to above 95°C, when the carnauba wax is completely melted, add 4.5 kg of distilled water above 95°C, after adding, keep stirring at above 95°C for 30 minutes, then cool to room temperature with stirring to obtain a wax emulsion with a solid content of 23%.

[0019] Embodiment five: Preparation of wax emulsion with 25% solid content: Select 1 kg of carnauba wax, 110 g of Tween-80, 40 g of FES-77 (fatty alcohol ether sulfate), 40 g of OT-75 (sodium dioctyl sulfosuccinate), and 3 g of sodium hydroxide, mix them, heat them to above 95°C, when the carnauba wax is completely melted, add 4.0 kg of distilled water above 95°C, after adding, keep stirring at above 95°C for 30 minutes, then cool to room temperature with stirring to obtain a wax emulsion with a solid content of 23%.

[0020] Observation of wax emulsion performance: 1. Centrifugal stability: Place the wax emulsion sample in a TD5G desktop centrifuge and centrifuge it at 3000 rpm for 15 minutes to observe whether there is stratification; 2. Storage stability: After the wax emulsion is sealed and stored at room temperature for a period of time, observe whether there is stratification; 3. Dispersibility: Drop the wax emulsion into water and observe its diffusion rate in the water.

[0021] The invention has the beneficial effects that: by selecting Tween-80 as a main emulsifier, and selecting fatty alcohol ether sulfate (FES-77) and dioctyl sodium sulfosuccinate (OT-75) as auxiliary emulsifiers, the main emulsifier and the auxiliary emulsifier are both environmentally friendly emulsifiers, which conform to the green environmental protection concept advocated now; the prepared carnauba wax emulsion belongs to a composition in the form of an oil-in-water emulsion; in centrifugal stability measurement, there is no stratification phenomenon; there is no stratification phenomenon after being placed at room temperature for one month; it can be quickly dispersed in water and becomes a blue fluorescent cloud-like state; after being slightly stirred, it becomes a blue or pale transparent solution.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wax emulsion prepared by an inverse emulsification method, characterized in that: The raw material components include: 3.0-10 kg of water, 1-5 kg ​​of carnauba wax, 20-90 g of composite emulsifier, 50-500 g of Tween-80, 20-90 g of fatty alcohol ether sulfate, 20-90 g of dioctyl sodium sulfosuccinate, 2-10 g of sodium hydroxide and appropriate amount of alkali.

2. The wax emulsion method according to claim 1, characterized in that: The mass ratio of the carnauba wax, Tween-80, fatty alcohol ether sulfate, dioctyl sodium sulfosuccinate and sodium hydroxide is (100-200): (10-20): (2.5-7): (2.5-7): (0.3-0.6).

3. The wax emulsion prepared by the inverse emulsification method according to claim 1, characterized in that: The mass fraction of water in the entire wax emulsion is not less than 65% to 80%; the mass fraction of fatty alcohol ether sulfate in the entire wax emulsion is 2.5 to 5.5%.

4. The wax emulsion prepared by the inverse emulsification method according to claim 1, characterized in that: The mass fraction of dioctyl sodium sulfosuccinate in the entire wax emulsion is 2.5-6.5%.

5. A method for preparing a wax emulsion by using an inverse emulsification method, characterized in that: The following steps are involved: S1, putting the formulated amount of carnauba wax, Tween-80, fatty alcohol ether sulfate, dioctyl sodium sulfosuccinate, sodium hydroxide and an appropriate amount of alkali into a stirring device, and fully heating and stirring, and after the carnauba wax is stirred and melted, a mixture is obtained; S2. Add the formulated amount of water to the mixture obtained in step S1, and put them into a mixing device for thorough mixing. During the process, a certain amount of high-temperature distilled water is added dropwise at a certain speed to obtain a mixed solution, i.e., an O / W emulsion.

6. A wax emulsion prepared by an inverse emulsification method and a preparation method thereof, characterized in that: The rotation speed of the stirring device in step S1 is 450-1000 r / min, and the water temperature when adding water in step S2 is 95-100° C.

7. A wax emulsion prepared by an inverse emulsification method and a preparation method thereof, characterized in that: In the stirring and mixing equipment in step S1 and step S2, a heat preservation stirring and mixing method is adopted, and the heat preservation temperature is 95°C~100°C, and the heat preservation stirring time is 20~45min. After the stirring and mixing is completed, the temperature is lowered and stirred at a constant stirring speed until it drops to room temperature.