Oleamide emulsion for pigment and filler dispersion and preparation method of oleamide emulsion

Abstract

The invention relates to the field of oleamide emulsion processing, and particularly discloses an oleamide emulsion for pigment and filler dispersion and a preparation method thereof.The oleamide emulsion for pigment and filler dispersion is prepared from 40-50 parts of oleamide, 80-100 parts of water, 3-7 parts of a dispersing agent, 1-3 parts of a stabilizer, 1-3 parts of an emulsifying agent, 1-3 parts of a flow promoter and 1-2 parts of a defoaming agent; the stabilizer is prepared from polyethylene glycol diacrylate modified cellosilk and polyglutamic acid modified nanofiller in a mass ratio of 1: (1-2); the preparation method comprises the following steps: uniformly mixing and stirring oleamide and water, heating and stirring, homogenizing, then adding the dispersing agent and the emulsifier, preserving heat and uniformly mixing to obtain a mixture; and cooling the mixture to 50-55 DEG C, adding a stabilizer, a flow promoter and a defoaming agent, uniformly mixing, defoaming, and cooling to room temperature to obtain a finished product. The invention has the advantages that the stability is better in the storage process, the layering phenomenon is not easy to occur, and the flowability and the dispersity are better in the use process.

Description

Technical Field

[0001] This application relates to the field of oleic acid amide emulsion processing. More specifically, it relates to an oleic acid amide emulsion for pigment and filler dispersion and a preparation method thereof. Background Art

[0002] For pigments and fillers to be evenly dispersed, a dispersant needs to be added. Oleic acid amide emulsion is an efficient dispersant. It can help pigment and filler particles disperse better in the medium. The hydrophilic and hydrophobic groups in its molecular structure enable it to interact with the surface of pigments and fillers, reducing the agglomeration force between particles, thereby improving the dispersion uniformity of pigments and fillers. And oleic acid amide emulsion can improve the wettability between pigments and fillers and the substrate, making it easier for pigments and fillers to be wetted and spread by the substrate, which helps to improve the construction performance of coatings or inks and reduce surface defects and uneven coating problems. At the same time, oleic acid amide emulsion can increase the stability of the pigment and filler dispersion system. It can form a stable protective film to prevent pigment and filler particles from settling and delaminating during storage and use, thus extending the service life of the product.

[0003] In the prior art, in order to prevent the oleic acid amide emulsion from delaminating during storage, generally the viscosity of the oleic acid amide emulsion is increased. However, increasing the viscosity easily affects the fluidity, which in turn leads to poor dispersion effect of the emulsion. If the viscosity of the oleic acid amide emulsion is low, the oleic acid amide emulsion has good fluidity and can be evenly dispersed, but the emulsion is prone to delamination during storage.

[0004] Therefore, how to prepare a new oleic acid amide emulsion with good stability during storage, not prone to delamination, and having good fluidity and dispersibility during use, which can be used as a pigment and filler dispersant, is a problem to be solved. Summary of the Invention

[0005] In order to prepare a new oleic acid amide emulsion with good stability during storage, not prone to delamination, and having good fluidity and dispersibility during use and being able to be evenly dispersed, this application provides an oleic acid amide emulsion for pigment and filler dispersion and a preparation method thereof.

[0006] In the first aspect, this application provides an oleic acid amide emulsion for pigment and filler dispersion, adopting the following technical scheme: An oleic acid amide emulsion for pigment and filler dispersion contains the following raw materials in parts by weight: 40 - 50 parts of oleic acid amide, 80 - 100 parts of water, 3 - 7 parts of dispersant, 1 - 3 parts of stabilizer, 1 - 3 parts of emulsifier, 1 - 3 parts of flow promoter, 1 - 2 parts of defoamer; the stabilizer is composed of polyethylene glycol diacrylate modified fiber filaments and polyglutamic acid modified nano-fillers with a mass ratio of 1:1 - 2.

[0007] By adopting the above technical solution, during the storage of the oleic acid amide emulsion, the dispersion effect of the dispersant is utilized to facilitate the uniform distribution of oleic acid amide, and combined with the emulsification effect of the emulsifier, the stability of the oleic acid amide emulsion is improved; in the stabilizer, the polyethylene glycol diacrylate modified fiber filaments and the polyglutamic acid modified nano-fillers cooperate with each other. By utilizing the light dispersion effect of the fiber filaments and the good cross-linking effect between the polyethylene glycol diacrylate loaded on its surface and oleic acid amide, the distribution stability of the polyethylene glycol diacrylate modified fiber filaments in the oleic acid amide emulsion is improved. In combination with the formation of hydrogen bonds between the carboxyl groups and amino groups of polyglutamic acid on the surface of the polyglutamic acid modified nano-fillers and oleic acid amide, the dispersion stability and distribution uniformity of oleic acid amide in the oleic acid amide emulsion are further improved, making it difficult for the emulsion to show a layering phenomenon during storage.

[0008] During the use of the oleic acid amide emulsion, excessive thickeners and binders are not added. Instead, the cross-linking and dispersion effects of the polyethylene glycol diacrylate modified fiber filaments, the polyglutamic acid modified nano-fillers and oleic acid amide are utilized to ensure stability, so that the oleic acid amide emulsion has a good flow effect during use, facilitating the dispersion of pigments and fillers.

[0009] Preferably, the polyethylene glycol diacrylate modified fiber filaments are made of polyethylene glycol diacrylate and microcrystalline cellulose with a mass ratio of 1:0.5 - 1.

[0010] By adopting the above technical solution, by utilizing the porous effect of microcrystalline cellulose, the surface of microcrystalline cellulose can load polyethylene glycol diacrylate, so that polyethylene glycol diacrylate is distributed on the surface and internal pores of microcrystalline cellulose. The viscosity of the emulsion is regulated by polyethylene glycol diacrylate, and combined with the rheological effect of microcrystalline cellulose on the emulsion, it is ensured that the emulsion has a good flow effect; and polyethylene glycol diacrylate is convenient for the connection of oleic acid amide, and combined with the hydroxyl groups of microcrystalline cellulose, it is convenient to connect with oleic acid amide, further improving the stability effect and dispersion uniformity of oleic acid amide in the oleic acid amide emulsion.

[0011] Preferably, the polyglutamic acid modified nano-fillers are prepared from carrier mesoporous silica and polyglutamic acid solution with a mass ratio of 1:0.1 - 0.3.

[0012] By adopting the above technical solution, the carrier mesoporous silica surface adheres to the polyglutamic acid solution. The amino and carboxyl groups in polyglutamic acid are further used to connect with oleic acid amide, and it can also connect with the hydroxyl groups in microcrystalline cellulose in the polyethylene glycol diacrylate modified fiber filaments, further improving the stability and distribution uniformity of the stabilizer and oleic acid amide in the oleic acid amide emulsion.

[0013] Preferably, the material-loading mesoporous silica is prepared by bonding a polycaprolactone melt solution after loading ethanol on the mesoporous silica, and the mass ratio of the mesoporous silica to the polycaprolactone melt solution is 1:0.2 - 0.4.

[0014] By adopting the above technical solution, the mesoporous silica has a pore structure and a large specific surface area, which is convenient for loading ethanol. Finally, it is coated through the bonding effect of the polycaprolactone melt solution. The melting point of polycaprolactone is about 60 °C. Ethanol is not easily completely volatilized, and it is immediately cooled and air-dried after coating, making the polycaprolactone melt solution form a film, ensuring the loading effect of the mesoporous silica on ethanol. Polycaprolactone is not easily soluble in ethanol, so part of the ethanol is retained in the pore structure of the mesoporous silica.

[0015] When the oleic acid amide emulsion is used at a higher temperature, it reaches the melting point of polycaprolactone, causing the polycaprolactone to melt and release ethanol, exposing the mesoporous silica. Utilizing the dilution effect of ethanol and the dispersion effect of the mesoporous silica, it ensures a good flow effect during use and ensures that the oleic acid amide emulsion still has a good flow effect when used at a higher temperature.

[0016] Preferably, the dispersant is composed of polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether with a mass ratio of 1:0.5 - 1.

[0017] By adopting the above technical solution, polyvinylpyrrolidone has excellent solubility and film-forming properties. In the oleic acid amide emulsion, it can improve the stability of the emulsion, prevent oil-water separation, and can also form a protective film on the surface of the emulsion to further improve the stability of the emulsion. While fatty alcohol polyoxyethylene ether can effectively reduce the oil-water interfacial tension, promote the dispersion and stability of oleic acid amide in water, and interact with the stabilizer to improve the stability of the stabilizer and oleic acid amide in the emulsion, and it is not easy to have a layering problem.

[0018] Preferably, the flow promoter is polycaprolactone-coated polyethylene glycol 8000, and the polycaprolactone-coated polyethylene glycol 8000 is prepared from a polycaprolactone melt solution and polyethylene glycol 8000 particles with a mass ratio of 1:1 - 2.

[0019] By adopting the above technical solution, during the storage of the oleic acid amide emulsion, the cooperation between polycaprolactone and oleic acid amide is utilized to ensure the stability of the oleic acid amide emulsion. During use, after reaching the melting point of polycaprolactone, the polyethylene glycol 8000 particles are released. Utilizing the water-soluble flow effect of polyethylene glycol 8000 with a lower addition amount, the fluidity of the oleic acid amide emulsion is further improved, so that the oleic acid amide emulsion has good stability during storage and is not easy to have a layering problem, and during use, it has a good flow effect.

[0020] Preferably, the defoamer is an organosilicon defoamer.

[0021] By adopting the above technical solution, the silicone defoamer has excellent defoaming performance, can effectively destroy and inhibit the generation of foam in the emulsion, and ensure the smoothness and uniformity of the emulsion.

[0022] Preferably, the emulsifier is Tween 80.

[0023] By adopting the above technical solution, Tween 80 has good solubilization and emulsification effects, and can improve the stability of the emulsion.

[0024] In the second aspect, the present application provides a preparation method of an oleic acid amide emulsion for pigment and filler dispersion, adopting the following technical solution: A preparation method of an oleic acid amide emulsion for pigment and filler dispersion, comprising the following steps: S1. Mix oleic acid amide and water evenly, heat up to 80 - 85 °C and stir for 20 - 30 min, and obtain a preliminary mixture through homogenization; S2. Add a dispersant and an emulsifier to the preliminary mixture, keep warm and mix evenly to obtain a mixed material; S3. Cool the mixed material to 50 - 55 °C, then add a stabilizer, a flow promoter, and a defoamer, mix evenly, and then perform vacuum defoaming and cool to room temperature to obtain a finished product.

[0025] By adopting the above technical solution, oleic acid amide is mixed and stirred evenly with substances such as a dispersant and an emulsifier at a higher temperature, and at a lower temperature, a stabilizer and a flow promoter are added and mixed evenly, ensuring that polycaprolactone is not easily melted, so that the oleic acid amide emulsion has good stability during storage and good fluidity during use, and still has good flow effect even when used at a higher temperature.

[0026] Preferably, the average particle size of oleic acid amide after homogenization in S1 is 0.5 - 1 μm.

[0027] By adopting the above technical solution, the particle size of oleic acid amide is limited, ensuring that oleic acid amide is not easily too small to aggregate, nor easily sink due to too large oleic acid amide particles, which affects the stability of the oleic acid amide emulsion; limiting this particle size ensures good stability and good fluidity of oleic acid amide.

[0028] In summary, the present application has the following beneficial effects: 1. During the storage of the oleic acid amide emulsion, the polyethylene glycol diacrylate modified fiber filaments and the polyglutamic acid modified nano-fillers cooperate with each other. By utilizing the light-weight dispersion effect of the fiber filaments and the good cross-linking effect between the polyethylene glycol diacrylate loaded on their surface and oleic acid amide, the distribution stability of the polyethylene glycol diacrylate modified fiber filaments in the oleic acid amide emulsion is improved. The carboxyl and amino groups of polyglutamic acid on the surface of the polyglutamic acid modified nano-fillers form hydrogen bonds with oleic acid amide, further improving the dispersion stability and distribution uniformity of oleic acid amide in the oleic acid amide emulsion, so that the emulsion is not prone to stratification during storage; and it ensures that the emulsion has a good flow effect, facilitating the dispersion of pigments and fillers.

[0029] 2. The melting point of polycaprolactone is 60 °C, and the melting point of polyethylene glycol 8000 is about 62 °C. Even if the polycaprolactone melt is evenly sprayed on the surface of polyethylene glycol 8000, causing partial softening and melting of the surface of polyethylene glycol 8000, the subsequent air-drying and cooling effect can ensure the coating effect of the polycaprolactone melt on polyethylene glycol 8000. By limiting the addition amount of polyethylene glycol 8000, under the action of a relatively high water content, it can ensure that the oleic acid amide emulsion has a good flow effect.

[0030] 3. When the oleic acid amide emulsion is used at a relatively high temperature, reaching the melting point of polycaprolactone causes the polycaprolactone to melt and release ethanol, exposing the mesoporous silica. Utilizing the dilution effect of ethanol and the dispersion effect of mesoporous silica, it ensures a good flow effect during use, and ensures that the oleic acid amide emulsion still has a good flow effect when used at a relatively high temperature. Detailed implementation mode

[0031] The following further elaborates on this application in combination with examples.

[0032] Preparation example of polyethylene glycol diacrylate modified fiber filaments The polyethylene glycol diacrylate was purchased from Guangzhou Shanghe Chemical Technology Co., Ltd., and other raw materials were all commercially available.

[0033] Preparation example 1: The polyethylene glycol diacrylate modified fiber filaments were prepared by the following method: 1 kg of polyethylene glycol diacrylate was evenly sprayed on the surface of 0.8 kg of microcrystalline cellulose at a spraying rate of 100 mL / min. During the spraying process, the microcrystalline cellulose was continuously stirred at 100 r / min, and the average length of the microcrystalline cellulose was 2 μm to obtain the finished product.

[0034] Preparation example 2: The difference between this preparation example and preparation example 1 is as follows: 1 kg of polyethylene glycol diacrylate was evenly sprayed on the surface of 0.5 kg of microcrystalline cellulose at a spraying rate of 100 mL / min. During the spraying process, the microcrystalline cellulose was continuously stirred at 100 r / min. The average length of the microcrystalline cellulose was 2 μm, and the finished product was obtained.

[0035] Preparation Example 3: The difference between this preparation example and Preparation Example 1 is as follows: 1 kg of polyethylene glycol diacrylate was evenly sprayed on the surface of 1 kg of microcrystalline cellulose at a spraying rate of 100 mL / min. During the spraying process, the microcrystalline cellulose was continuously stirred at 100 r / min. The average length of the microcrystalline cellulose was 2 μm, and the finished product was obtained.

[0036] Preparation Examples of Polyglutamic Acid-Modified Nanofillers The following raw materials are all commercially available.

[0037] Preparation Example 4: The polyglutamic acid-modified nanofiller was prepared by the following method: 1 kg of mesoporous silica was evenly dispersed in 10 kg of ethanol. The average particle size of the mesoporous silica was 200 nm, and the mass fraction of ethanol was 75%. It was ultrasonically dispersed for 10 min at 20 kHz, then allowed to stand for 10 min, and the ethanol was filtered out. 0.3 kg of polycaprolactone melt was evenly sprayed on the surface of the mesoporous silica. The polycaprolactone melt was prepared by heating polycaprolactone to 65 °C for melting. After spraying, it was immediately air-dried and dispersed so that the mesoporous silica did not adhere and agglomerate, obtaining the carrier-loaded mesoporous silica; 0.2 kg of polyglutamic acid solution was evenly sprayed on the surface of 1 kg of the carrier-loaded mesoporous silica. The polyglutamic acid solution was an aqueous solution of polyglutamic acid with a mass fraction of 5%. After drying, it was dispersed so that the carrier-loaded mesoporous silica did not adhere and agglomerate, obtaining the polyglutamic acid-modified nanofiller.

[0038] Preparation Example 5: The difference between this preparation example and Preparation Example 4 is as follows: 1 kg of mesoporous silica was evenly dispersed in 10 kg of ethanol. The average particle size of the mesoporous silica was 200 nm, and the mass fraction of ethanol was 75%. It was ultrasonically dispersed for 10 min at 20 kHz, then allowed to stand for 10 min, and the ethanol was filtered out. 0.2 kg of polycaprolactone melt was evenly sprayed on the surface of the mesoporous silica. The polycaprolactone melt was prepared by heating polycaprolactone to 65 °C for melting. After spraying, it was immediately air-dried and dispersed so that the mesoporous silica did not adhere and agglomerate, obtaining the finished product; 0.1 kg of polyglutamic acid solution was evenly sprayed on the surface of 1 kg of the carrier-loaded mesoporous silica. The polyglutamic acid solution was an aqueous solution of polyglutamic acid with a mass fraction of 5%. After drying, it was dispersed so that the carrier-loaded mesoporous silica did not adhere and agglomerate, obtaining the polyglutamic acid-modified nanofiller.

[0039] Preparation Example 6: The difference between this preparation example and Preparation Example 4 is as follows: 1 kg of mesoporous silica was evenly dispersed in 10 kg of ethanol. The average particle size of the mesoporous silica was 200 nm, and the mass fraction of ethanol was 75%. It was ultrasonically dispersed for 10 min under the condition of 20 kHz, then allowed to stand for 10 min, the ethanol was filtered out, and 0.4 kg of polycaprolactone melt was evenly sprayed on the surface of the mesoporous silica. The polycaprolactone melt was prepared by melting polycaprolactone at 65 °C. After spraying, it was immediately air-dried and dispersed so that the mesoporous silica did not adhere and agglomerate to obtain the finished product; 0.3 kg of polyglutamic acid solution was evenly sprayed on the surface of 1 kg of loaded mesoporous silica. The polyglutamic acid solution was an aqueous solution of polyglutamic acid with a mass fraction of 5%. After drying, it was dispersed so that the loaded mesoporous silica did not adhere and agglomerate to obtain the polyglutamic acid-modified nano filler.

[0040] Preparation Example of Polycaprolactone-Coated Polyethylene Glycol 8000 All other raw materials were commercially available.

[0041] Preparation Example 7: Polycaprolactone-coated polyethylene glycol 8000 was prepared by the following method: 1 kg of polycaprolactone melt was evenly sprayed on the surface of 1.5 kg of polyethylene glycol 8000 particles. The average particle size of the polyethylene glycol 8000 particles was 10 μm, and the polycaprolactone melt was prepared by melting polycaprolactone at 60 °C. After spraying the polycaprolactone melt, it was immediately air-dried and finally polished and dispersed to an average particle size of 2 μm to obtain polycaprolactone-coated polyethylene glycol 8000.

[0042] Preparation Example 8: The difference between this preparation example and Preparation Example 8 is as follows: 1 kg of polycaprolactone melt was evenly sprayed on the surface of 1 kg of polyethylene glycol 8000 particles. The polycaprolactone melt was prepared by melting polycaprolactone at 60 °C. After spraying the polycaprolactone melt, it was immediately air-dried and finally polished and dispersed to an average particle size of 2 μm to obtain polycaprolactone-coated polyethylene glycol 8000.

[0043] Preparation Example 9: The difference between this preparation example and Preparation Example 8 is as follows: 1 kg of polycaprolactone melt was evenly sprayed on the surface of 2 kg of polyethylene glycol 8000 particles. The polycaprolactone melt was prepared by melting polycaprolactone at 60 °C. After spraying the polycaprolactone melt, it was immediately air-dried and finally polished and dispersed to an average particle size of 2 μm to obtain polycaprolactone-coated polyethylene glycol 8000. Examples

[0044] Example 1: An oleic acid amide emulsion for pigment and filler dispersion: 45 kg of oleic acid amide, 90 kg of water, 5 kg of dispersant, 2 kg of stabilizer, 2 kg of emulsifier, 2 kg of flow promoter, 1 kg of defoamer; the stabilizer is composed of polyethylene glycol diacrylate modified fiber filaments prepared in Preparation Example 1 and polyglutamic acid modified nano-fillers prepared in Preparation Example 4 in a mass ratio of 1:1; the dispersant is composed of polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1; the emulsifier is Tween 80; the flow promoter is polycaprolactone-coated polyethylene glycol 8000 prepared in Preparation Example 7, and the defoamer is an organosilicon defoamer; The preparation method is as follows: S1. Mix oleic acid amide and water and stir evenly, heat up to 85 °C and stir for 30 min, then homogenize. After homogenization, the average particle size of oleic acid amide is 1 μm to obtain a preliminary mixture; S2. Add the dispersant and emulsifier to the preliminary mixture and stir evenly, keep warm at 80 °C for 30 min to obtain a mixed material; S3. Cool the mixed material to 50 °C, then add the stabilizer, flow promoter and defoamer, mix evenly, and then perform vacuum degassing and cool down to room temperature of 25 °C to obtain the finished product.

[0045] Example 2: The difference between this example and Example 1 is that: 40 kg of oleic acid amide, 80 kg of water, 3 kg of dispersant, 1 kg of stabilizer, 1 kg of emulsifier, 1 kg of flow promoter, 1 kg of defoamer; the stabilizer is composed of polyethylene glycol diacrylate modified fiber filaments prepared in Preparation Example 2 and polyglutamic acid modified nano-fillers prepared in Preparation Example 5 in a mass ratio of 1:1; the dispersant is composed of polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether in a mass ratio of 1:0.5; the emulsifier is Tween 80; the flow promoter is polycaprolactone-coated polyethylene glycol 8000 prepared in Preparation Example 8, and the defoamer is an organosilicon defoamer; The preparation method is as follows: S1. Mix oleic acid amide and water and stir evenly, heat up to 80 °C and stir for 20 min, then homogenize. After homogenization, the average particle size of oleic acid amide is 0.5 μm to obtain a preliminary mixture; S2. Add the dispersant and emulsifier to the preliminary mixture and stir evenly, keep warm for 30 min to obtain a mixed material; S3. Cool the mixed material to 55 °C, then add the stabilizer, flow promoter and defoamer, mix evenly, and then perform vacuum degassing and cool down to room temperature of 25 °C to obtain the finished product.

[0046] Example 3: The difference between this example and Example 1 is that: 50 kg of oleic acid amide, 100 kg of water, 7 kg of dispersant, 3 kg of stabilizer, 3 kg of emulsifier, 3 kg of flow promoter, 2 kg of defoamer; the stabilizer is composed of polyethylene glycol diacrylate modified fiber filaments prepared in Preparation Example 3 and polyglutamic acid modified nano-fillers prepared in Preparation Example 6 with a mass ratio of 1:2; the dispersant is composed of polyvinylpyrrolidone and fatty alcohol polyoxyethylene ether with a mass ratio of 1:1; the emulsifier is Tween 80; the flow promoter is polycaprolactone-coated polyethylene glycol 8000 prepared in Preparation Example 9, and the defoamer is an organosilicon defoamer.

[0047] Example 4: The difference between this example and Example 1 is that: During the preparation process of the polyglutamic acid modified nano-fillers, ethanol was not loaded on the surface of the carrier mesoporous silica.

[0048] Example 5: The difference between this example and Example 1 is that: During the preparation process: S1. Mix oleic acid amide and water and stir evenly, heat up to 80 °C and stir until the oleic acid amide is completely dissolved, and homogenize. The average particle size of the oleic acid amide after homogenization is 0.5 μm to obtain a preliminary mixture; S2. Add a dispersant, an emulsifier, a stabilizer, a flow promoter, and a defoamer to the preliminary mixture, mix and stir evenly at 80 °C, keep warm for 30 min, and cool to room temperature to obtain the finished product.

[0049] Comparative Example Comparative Example 1: The difference between this comparative example and Example 1 is that: The stabilizer in the raw materials is sodium alginate.

[0050] Comparative Example 2: The difference between this comparative example and Example 1 is that: In the raw materials, microcrystalline cellulose with the same mass is used to replace the polyethylene glycol diacrylate modified fiber filaments, and silica with the same mass is used to replace the polyglutamic acid modified nano-fillers.

[0051] Comparative Example 3: The difference between this comparative example and Example 1 is that: In the raw materials, polyethylene glycol diacrylate with the same mass is used to replace the polyethylene glycol diacrylate modified fiber filaments, and polyglutamic acid with the same mass is used to replace the polyglutamic acid modified nano-fillers.

[0052] Comparative Example 4: The difference between this comparative example and Example 1 is that: The flow promoter was not added to the raw materials.

[0053] Performance Detection Test 1. Stability Detection The oleic acid amide emulsions were prepared by the methods of Examples 1-3 and Comparative Examples 2-3 respectively. The oleic acid amide emulsions were placed in cylindrical bottles and allowed to stand for 60 days. The phenomenon of turbidity and stratification was observed, and the turbidity and stratification grade was recorded. No turbidity, precipitation, and stratification phenomenon was rated 10 points → severe turbidity, precipitation, and stratification phenomenon was rated 1 point.

[0054] 2. Fluidity detection The oleic acid amide emulsions were prepared by the methods of Examples 1-5 and Comparative Examples 1 and 4 respectively. The viscosity of the emulsions was detected by a viscometer, and the emulsions were heated to 80 °C and the viscosity was detected continuously, and the data was recorded.

[0055] Table 1 Performance test table (" / " in the table represents that the corresponding comparative example did not detect this item, so there is no data) Combined with Examples 1-3 and Table 1, it can be seen that the oleic acid amide emulsion prepared in this application has good storage stability and use fluidity, and still has good fluidity at a relatively high temperature.

[0056] Combined with Example 1 and Examples 4-5 and Table 1, it can be seen that in the preparation process of the polyglutamic acid modified nano-filler in Example 4, silica was used to replace the carrier mesoporous silica with the same mass. Compared with Example 1, the viscosity of the emulsion prepared in Example 4 was slightly higher than that in Example 1, and the viscosity under high temperature conditions was also higher than that in Example 1; it shows that mesoporous silica loaded with ethanol can adjust the fluidity of the emulsion under high temperature conditions.

[0057] In Example 5, a dispersant, an emulsifier, a stabilizer, a flow promoter, and an antifoaming agent were added to the premix and mixed and stirred evenly at 80 °C. Compared with Example 1, the viscosity of the emulsion prepared in Example 5 was higher than that in Example 1, and the viscosity at high temperature was higher than that in Example 1; it shows that during the preparation process of the emulsion, the ethanol loaded in the mesoporous silica has been consumed, and polyethylene glycol 8000 in the flow promoter is also distributed in the emulsion, thus affecting the fluidity of the oleic acid amide emulsion.

[0058] Combined with Example 1 and Comparative Examples 1-4 and Table 1, it can be seen that in Comparative Example 1, the stabilizer in the raw material was sodium alginate. Compared with Example 1, the viscosity of the emulsion prepared in Comparative Example 1 was higher than that in Example 1, indicating that the high viscosity of sodium alginate affects the fluidity of the oleic acid amide emulsion.

[0059] In Comparative Example 2, microcrystalline cellulose was used to replace poly(ethylene glycol) diacrylate modified fiber filaments with the same mass, and silica was used to replace polyglutamic acid modified nano-fillers with the same mass. Compared with Example 1, the fraction of the emulsion prepared in Comparative Example 2 was lower than that in Example 1; it shows that poly(ethylene glycol) diacrylate, polyglutamic acid and oleic acid amide can be connected to improve the dispersion stability and uniformity of oleic acid amide in the oleic acid amide emulsion, and it is not easy to appear problems of stratification and precipitation.

[0060] In Comparative Example 3, the polyethylene glycol diacrylate modified fiber filaments were replaced with polyethylene glycol diacrylate of the same mass in the raw materials, and the polyglutamic acid modified nano-fillers were replaced with polyglutamic acid of the same mass. Compared with Example 1, the emulsion fraction prepared in Comparative Example 3 was lower than that in Example 1; it shows that microcrystalline cellulose and mesoporous silica can also be connected with oleic acid amide to improve the stability of oleic acid amide in the oleic acid amide emulsion, and problems such as delamination and precipitation are not likely to occur.

[0061] In Comparative Example 4, the flow promoter was not added to the raw materials. Compared with Example 1, the viscosity of the emulsion prepared in Comparative Example 4 was higher than that in Example 1, indicating that the flow promoter can improve the fluidity of the emulsion.

[0062] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this embodiment as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An oleic acid amide emulsion for pigment and filler dispersion, characterized in that: Contains the following raw materials in parts by weight: 40-50 parts of oleic acid amide, 80-100 parts of water, 3-7 parts of dispersant, 1-3 parts of stabilizer, 1-3 parts of emulsifier, 1-3 parts of flow promoter, 1-2 parts of defoamer; the stabilizer is composed of polyethylene glycol diacrylate modified fiber and polyglutamic acid modified nano filler in a mass ratio of 1:1-2.

2. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The polyethylene glycol diacrylate modified fiber yarn is made of polyethylene glycol diacrylate and microcrystalline cellulose in a mass ratio of 1:0.5-1.

3. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The polyglutamic acid modified nano filler is prepared from mesoporous silica and polyglutamic acid solution in a mass ratio of 1:0.1-0.

3.

4. The oleic acid amide emulsion for pigment and filler dispersion according to claim 3, characterized in that: The loaded mesoporous silica is prepared by loading ethanol on mesoporous silica and then bonding it with polycaprolactone melt, and the mass ratio of the mesoporous silica to the polycaprolactone melt is 1:0.2-0.

4.

5. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The dispersant is composed of polyvinyl pyrrolidone and fatty alcohol polyoxyethylene ether in a mass ratio of 1:0.5-1.

6. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The flow promoter is polycaprolactone-coated polyethylene glycol 8000, which is prepared from polycaprolactone melt and polyethylene glycol 8000 particles in a mass ratio of 1:1-2.

7. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The defoamer is an organosilicon defoamer.

8. The oleic acid amide emulsion for pigment and filler dispersion according to claim 1, characterized in that: The emulsifier is Tween 80.

9. The method for preparing the oleic acid amide emulsion for pigment and filler dispersion according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Mix oleamide and water and stir evenly, raise the temperature to 80-85°C and stir for 20-30 minutes, and homogenize to obtain a primary mixture; S2, adding dispersant and emulsifier to the initial mixture, mixing and stirring evenly to obtain a mixture; S3. The mixture is cooled to 50-55°C, and then stabilizer, flow promoter and defoamer are added. After mixing evenly, vacuum degassing is performed and the mixture is cooled to room temperature to obtain the finished product.

10. The method for preparing an oleic acid amide emulsion for pigment and filler dispersion according to claim 9, characterized in that: The average particle size of the oleamide after homogenization in S1 is 0.5-1 μm.

Images