Dispersing agent based on caprolactone and polyethyleneimine and preparation method thereof
Through the dispersant preparation method of caprolactone and polyethyleneimine, combined with polyhydroxystearic acid and phosphate monomer modification, the problems of high cost of dispersant, environmental pollution and unstable performance are solved, and good dispersion effect and stability in aqueous and oily systems are achieved, and the application scope is broadened.
Patent Information
- Application Number
- CN202510324538.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2025-07-04
AI Technical Summary
The existing dispersant has high production costs, serious environmental pollution, and unstable performance, making it difficult to meet the adaptability of diversified filler systems, especially under high temperature conditions, and the dispersion effect is reduced, and traditional dispersant has poor compatibility in aqueous and oily systems.
The dispersant is prepared through a specific synthetic process using caprolactone and polyethyleneimine as raw materials, and the modification of polyhydroxystearic acid and phosphate monomers is used to optimize the compatibility of the dispersant in aqueous and oily systems, and the introduction of phosphate groups as internal plasticizers reduces the interaction force between molecular chains.
It significantly improves the dispersion effect and stability of dispersants in aqueous and oily systems, broadens the scope of application, reduces production costs, reduces environmental pollution, and is suitable for a variety of complex application environments.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of dispersants, and particularly relates to a dispersant based on caprolactone and polyethyleneimine and a preparation method thereof. Background Art
[0002] Dispersants are one of the indispensable key additives in coatings, inks, adhesives and other related fields. Their main function is to promote the uniform dispersion of pigments and fillers in the matrix. The dispersion quality of pigments and fillers directly affects the performance of the final product, such as color uniformity, gloss, stability, rheological properties and mechanical strength. In the production process of coatings and inks, pigments and fillers tend to aggregate and form agglomerates, resulting in uneven dispersion, which in turn affects the quality and performance of the product. Dispersants adsorb on the surface of pigments and fillers, reduce the interaction force between particles, prevent agglomeration, and thus improve the dispersion effect.
[0003] Traditional dispersants mainly include low-molecular-weight surfactants and high-molecular polymers. Low-molecular-weight surfactants mainly achieve dispersion through electrostatic repulsion, but their stability and persistence are poor. High-molecular polymer dispersants, on the other hand, can provide a more persistent dispersion effect through steric hindrance effects and electrostatic stabilization mechanisms. In recent years, with the progress of materials science, polymeric dispersants have gradually become the mainstream, especially those prepared by ring-opening polymerization or molecular interactions between polymers, which have stronger dynamic structures and a wider range of applications.
[0004] The dispersants in the prior art have the following disadvantages and limitations: 1. High production cost. The preparation of polymeric dispersants usually involves complex chemical reactions and precise process control, resulting in high production costs. Due to the high production cost, the price of polymeric dispersants is usually high, which limits their application in some price-sensitive fields, such as architectural coatings, packaging printing inks, etc. In these fields, customers have strict cost control, and high-priced dispersants are difficult to be widely accepted, thus limiting their market penetration rate. 2. Complex structure treatment process and difficult control. The molecular structure design of polymeric dispersants is complex, and usually requires precise control of parameters such as molecular weight, molecular weight distribution, block length, functional group position, etc. to achieve the best dispersion effect. However, in actual production, the control of these parameters is difficult, and it is easily affected by various factors such as reaction conditions, catalyst activity, monomer purity, etc., resulting in inconsistent product performance between batches. 3. The environmental operation effect is sensitive to temperature and shear. The performance of polymeric dispersants in actual applications is often affected by environmental conditions, especially temperature and shear force. At high temperatures, the molecular chains of dispersants may desorb or break, resulting in the re-agglomeration of pigments and fillers and a decrease in the dispersion effect.
[0005] In addition to performance limitations, there are also some problems with the environmental friendliness of existing dispersants. First of all, many polymeric dispersants are synthesized using toxic or non-degradable chemicals, such as organic solvents, heavy metal catalysts, etc. These substances may cause environmental pollution during production and use.
[0006] In addition, most traditional dispersants are produced through complex chemical synthesis processes, which may cause environmental pollution and have negative impacts on human health, making it difficult to meet the increasingly strict environmental protection requirements. Limited dispersion effect and stability: Existing dispersants show poor dispersion effects and stability in the dispersion of pigments and fillers, especially in high-demand application scenarios (such as high solid content systems or high-temperature conditions), and their performance often fails to meet expectations. Limited scope of application: The functions of existing dispersants are relatively single, lacking the ability to adapt to diverse filler systems and unable to meet the requirements of both water-based and oil-based systems simultaneously.
[0007] Therefore, there is an urgent need for a dispersant based on caprolactone and polyethyleneimine and its preparation method. Summary of the Invention
[0008] The object of the present invention is to provide a dispersant based on caprolactone and polyethyleneimine and its preparation method.
[0009] To achieve the above object, the present invention provides the following technical solutions: A preparation method of a dispersant based on caprolactone and polyethyleneimine, comprising the following steps: (1) Add xylene to a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add caprolactone monomer and polyhydroxystearic acid, and stir evenly; the molecular weight range of polyhydroxystearic acid: 300 - 4200; (2) Slowly add an organotin catalyst to the reaction kettle, add antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring, with a rotation speed of 200 - 300 rpm, and react for 2 - 3 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine to the modified polycaprolactone system, heat to 160 - 180 °C, continue to react for 1 - 2 hours, add stearic acid as a terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0010] Furthermore, the preparation method of the modified polycaprolactone system comprises the following steps: by weight, (1) Add 100 parts of xylene to a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 60 - 70 parts of caprolactone monomer and 10 - 20 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.05 - 0.1 parts of organotin catalyst into the reaction kettle, add 0.01 - 0.05 parts of antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring at a speed of 200 - 300 rpm, and react for 2 - 3 hours to obtain a modified polycaprolactone system.
[0011] Further, the polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 550 - 600, polyhydroxystearic acid with a molecular weight of 1200 - 1300, and polyhydroxystearic acid with a molecular weight of 2000 - 2100.
[0012] Further, the polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 550 - 600, polyhydroxystearic acid with a molecular weight of 1200 - 1300, and polyhydroxystearic acid with a molecular weight of 2000 - 2100 in a weight ratio of 1:1.2 - 1.4:0.5 - 0.7.
[0013] Further, the weight ratio of polyethyleneimine to caprolactone monomer is 0.2 - 0.4:6 - 7.
[0014] Further, the addition amount of the terminator is 1% - 2% of the total weight of the raw materials.
[0015] Further, the step (1) also includes a phosphate monomer, specifically: (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 60 - 70 parts of caprolactone monomer, 15 - 20 parts of phosphate monomer, and 10 - 20 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.05 - 0.1 parts of organotin catalyst into the reaction kettle, add 0.01 - 0.05 parts of antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring at a speed of 200 - 300 rpm, and react for 2 - 3 hours to obtain a modified polycaprolactone system.
[0016] Further, the phosphate monomer includes methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.3 - 1.5.
[0017] Further, the phosphate monomer includes methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.4.
[0018] The present invention provides a dispersant based on caprolactone and polyethyleneimine prepared by the described preparation method.
[0019] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. By selecting green raw materials and improving the synthesis process, the present invention reduces the potential hazards to the environment and health. The dispersant can exhibit good dispersion effects in both aqueous and oily systems, significantly enhancing the dispersibility of pigments and fillers and the stability of the system. Meanwhile, the dispersant has good system compatibility and is applicable to a variety of complex application environments, thus broadening the application scope of the dispersant.
[0020] 2. By using polyhydroxystearic acid to modify the dispersant, the present invention can optimize the compatibility of the dispersant in oily and aqueous systems and improve the dispersibility of the dispersant at the same time.
[0021] 3. By introducing a phosphate ester monomer, the phosphate ester group acts as an internal plasticizer, which can reduce the intermolecular interaction force and prevent cracks caused by the stiffness of molecular chains at low temperatures. Detailed Embodiments
[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0023] Embodiment 1 This embodiment provides a dispersant based on caprolactone and polyethyleneimine, and the preparation method includes the following steps: (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 65 parts of caprolactone monomer, 18 parts of phosphate ester monomer and 15 parts of polyhydroxystearic acid, and stir evenly; the molecular weight range of polyhydroxystearic acid: 300 - 4200; (2) Slowly add 0.07 parts of an organotin catalyst into the reaction kettle, add 0.03 parts of antioxidant BHT, raise the temperature of the reaction system to 130 °C, start stirring, the rotation speed is 250 rpm, and the reaction time is 2.5 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine into the modified polycaprolactone system, raise the temperature to 170 °C, continue the reaction for 1.5 hours, add a terminator stearic acid to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0024] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 580, polyhydroxystearic acid with a molecular weight of 1250, and polyhydroxystearic acid with a molecular weight of 2040 in a weight ratio of 1:1.3:0.6.
[0025] The weight ratio of polyethyleneimine to caprolactone monomer is 0.3:7.
[0026] The amount of the terminator added is 1.5% by weight of the total amount of the raw materials.
[0027] The phosphate monomers include methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.4.
[0028] Example 2 This embodiment provides a dispersant based on caprolactone and polyethyleneimine, and the preparation method comprises the following steps: (1) Add 100 parts of xylene to a dry reactor, introduce inert gas to exclude air, ensure an anhydrous and oxygen-free environment, add 60 parts of caprolactone monomer, 20 parts of phosphate monomer and 10 parts of polyhydroxystearic acid, and stir evenly; (2) 0.1 parts of an organic tin catalyst was slowly added into the reaction kettle, and 0.01 parts of an antioxidant BHT was added. The reaction system was heated to 140°C, and stirring was started at a speed of 200 rpm. The reaction time was 3 hours to obtain a modified polycaprolactone system. (3) Add polyethyleneimine to the modified polycaprolactone system, raise the temperature to 160°C, continue the reaction for 2 hours, add a terminator stearic acid to terminate the reaction, cool the reaction system to room temperature, remove xylene by vacuum distillation, and obtain a dispersant based on caprolactone and polyethyleneimine.
[0029] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 550, polyhydroxystearic acid with a molecular weight of 1300 and polyhydroxystearic acid with a molecular weight of 2000 in a weight ratio of 1:1.2:0.7.
[0030] The weight ratio of polyethyleneimine to caprolactone monomer is 0.2:3.
[0031] The amount of the terminator added is 1% by weight of the total amount of the raw materials.
[0032] The phosphate monomers include methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.3.
[0033] Example 3 This embodiment provides a dispersant based on caprolactone and polyethyleneimine, and the preparation method comprises the following steps: (1) Add 100 parts of xylene to a dry reactor, introduce inert gas to exclude air, ensure an anhydrous and oxygen-free environment, add 70 parts of caprolactone monomer, 15 parts of phosphate monomer and 20 parts of polyhydroxystearic acid, and stir evenly; (2) 0.05 parts of an organic tin catalyst was slowly added into the reaction kettle, and 0.05 parts of an antioxidant BHT was added. The reaction system was heated to 120°C, and stirring was started at a speed of 300 rpm. The reaction time was 2 hours to obtain a modified polycaprolactone system. (3) Add polyethyleneimine to the modified polycaprolactone system, heat up to 180 °C, continue the reaction for 1 hour, add the terminator stearic acid to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0034] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 600, polyhydroxystearic acid with a molecular weight of 1200, and polyhydroxystearic acid with a molecular weight of 2100 at a weight ratio of 1:1.4:0.5.
[0035] The weight ratio of polyethyleneimine to caprolactone monomer is 0.2:7.
[0036] The addition amount of the terminator is 2% by weight of the total amount of raw materials.
[0037] The phosphate monomer includes methacrylic acid phosphate and vinyl phosphate at a weight ratio of 1:1.5.
[0038] Comparative Example 1 The difference between this comparative example and Example 1 is that polyhydroxystearic acid and phosphate monomers are not used for modification.
[0039] Specifically, a dispersant based on caprolactone and polyethyleneimine, the preparation method includes the following steps: (1) Add 100 parts of xylene to a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and oxygen-free environment, add 65 parts of caprolactone monomer, and stir evenly; (2) Slowly add 0.07 parts of organotin catalyst to the reaction kettle, add 0.03 parts of antioxidant BHT, heat the reaction system to 130 °C, start stirring, the rotation speed is 250 rpm, and the reaction time is 2.5 hours to obtain a polycaprolactone system; (3) Add polyethyleneimine to the polycaprolactone system, heat up to 170 °C, continue the reaction for 1.5 hours, add the terminator stearic acid to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0040] The weight ratio of polyethyleneimine to caprolactone monomer is 0.3:7.
[0041] The addition amount of the terminator is 1.5% by weight of the total amount of raw materials.
[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that polyhydroxystearic acid is not used for modification.
[0043] Specifically, a dispersant based on caprolactone and polyethyleneimine, the preparation method includes the following steps: (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 65 parts of caprolactone monomer and 18 parts of phosphate monomer, and stir evenly; (2) Slowly add 0.07 part of organotin catalyst into the reaction kettle, add 0.03 part of antioxidant BHT, heat the reaction system to 130 °C, start stirring at a speed of 250 rpm, and react for 2.5 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine into the modified polycaprolactone system, heat it to 170 °C, continue to react for 1.5 hours, add stearic acid as a terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0044] The addition amount of the terminator is 1.5% by weight of the total amount of raw materials.
[0045] The phosphate monomer includes methacrylic acid phosphate and vinyl phosphate with a weight ratio of 1:1.4.
[0046] Comparative Example 3 The difference between this comparative example and Example 1 is that modification is not carried out using a phosphate monomer.
[0047] Specifically, a dispersant based on caprolactone and polyethyleneimine, the preparation method includes the following steps: (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 65 parts of caprolactone monomer and 15 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.07 part of organotin catalyst into the reaction kettle, add 0.03 part of antioxidant BHT, heat the reaction system to 130 °C, start stirring at a speed of 250 rpm, and react for 2.5 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine into the modified polycaprolactone system, heat it to 170 °C, continue to react for 1.5 hours, add stearic acid as a terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0048] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 580, polyhydroxystearic acid with a molecular weight of 1250, and polyhydroxystearic acid with a molecular weight of 2040 in a weight ratio of 1:1.3:0.6.
[0049] The weight ratio of polyethyleneimine to caprolactone monomer is 0.3:7.
[0050] The addition amount of the terminator is 1.5% by weight of the total amount of raw materials.
[0051] Comparative Example 4 The difference between this comparative example and Example 1 is: different ratios of polyhydroxystearic acid.
[0052] Specifically: A dispersant based on caprolactone and polyethyleneimine, the preparation method includes the following steps: (1) Add 100 parts of xylene to a dry reaction kettle, and introduce an inert gas to remove air to ensure an anhydrous and anaerobic environment. Add 65 parts of caprolactone monomer, 18 parts of phosphate monomer, and 15 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.07 parts of organotin catalyst to the reaction kettle, add 0.03 parts of antioxidant BHT, heat the reaction system to 130 °C, start stirring, the rotation speed is 250 rpm, and the reaction time is 2.5 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine to the modified polycaprolactone system, heat up to 170 °C, continue to react for 1.5 hours, add stearic acid as the terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0053] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 580, polyhydroxystearic acid with a molecular weight of 1250, and polyhydroxystearic acid with a molecular weight of 2040 at a weight ratio of 1:1:1.
[0054] The weight ratio of polyethyleneimine to caprolactone monomer is 0.3:7.
[0055] The addition amount of the terminator is 1.5% by weight of the total amount of raw materials.
[0056] The phosphate monomer includes methyl methacrylate phosphate and vinyl phosphate at a weight ratio of 1:1.4.
[0057] Comparative Example 5 The difference between this comparative example and Example 1 is: different ratios of phosphate monomers.
[0058] Specifically: A dispersant based on caprolactone and polyethyleneimine, the preparation method includes the following steps: (1) Add 100 parts of xylene to a dry reaction kettle, and introduce an inert gas to remove air to ensure an anhydrous and anaerobic environment. Add 65 parts of caprolactone monomer, 18 parts of phosphate monomer, and 15 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.07 parts of organotin catalyst into the reaction kettle, add 0.03 parts of antioxidant BHT, heat the reaction system to 130 °C, start stirring at a speed of 250 rpm, and react for 2.5 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine to the modified polycaprolactone system, heat to 170 °C, continue to react for 1.5 hours, add stearic acid as the terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
[0059] The polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 580, polyhydroxystearic acid with a molecular weight of 1250, and polyhydroxystearic acid with a molecular weight of 2040 in a weight ratio of 1:1.3:0.6.
[0060] The weight ratio of polyethyleneimine to caprolactone monomer is 0.3:7.
[0061] The addition amount of the terminator is 1.5% of the total weight of the raw materials.
[0062] The phosphate monomer includes methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.
[0063] Performance testing Perform performance detection on the dispersants of Examples 1-3 and Comparative Examples 1-5. Among them, the low-temperature flexibility is tested according to the standard of GB / T16777-2008, the stain resistance index is tested according to the standard of GBT9780-2013, and the film gloss is tested according to the standard of GB / T5237.4-2017.
[0064] In the table, "film gloss" and "stain resistance index" are indicators reflecting the dispersion degree of the coating. The more uniform the dispersion, the better the gloss, and the smoother the surface, the less likely it is to be contaminated, indicating better dispersion performance of the dispersant. "Low-temperature flexibility" is also an indicator reflecting the dispersion performance, which means that when the coating of the coating is bent with the coated object under certain conditions, the coating will not produce cracks.
[0065] Table 1 Performance test results
[0066] From the above performance test results, it can be seen that the dispersants of Examples 1-3 have good dispersion effects.
[0067] However, in the comparative examples, because the necessary technical solutions were not adopted, their performance in the corresponding performance tests was significantly worse than that of the examples.
[0068] In Comparative Example 1, polyhydroxystearic acid and phosphate monomer were not used for modification, and the dispersion effect of the dispersant on the coating decreased.
[0069] In Comparative Example 2, polyhydroxystearic acid was not used for modification, and the dispersion effect of the dispersant on the coating decreased.
[0070] In Comparative Example 3, the phosphate monomer was not used for modification, and the dispersion effect of the dispersant on the coating decreased, and the low-temperature flexibility deteriorated.
[0071] In Comparative Example 4, due to the different ratios of polyhydroxystearic acid, the dispersion effect of the dispersant on the coating decreased. If the molecular weight of PEG is too high, it may lead to too high viscosity of the dispersant, affecting the processing performance; if the molecular weight is too low, the dispersion effect may be reduced. Selecting the molecular weight of the compounded polyhydroxystearic acid of the present invention has better effects.
[0072] In Comparative Example 5, due to the different ratios of the phosphate monomer, the present invention uses a phosphate group with a specific ratio as an internal plasticizer, which can reduce the intermolecular interaction force and prevent cracks caused by the stiffness of the molecular chain at low temperatures. At the same time, the phosphate group can form strong chemical bonds with the surface of the pigment, and the dispersant improves the adsorption stability.
[0073] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.
Claims
1. A preparation method of a dispersant based on caprolactone and polyethyleneimine, characterized in that It includes the following steps: (1) Add xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add caprolactone monomer and polyhydroxystearic acid, and stir evenly; the molecular weight range of polyhydroxystearic acid: 300 - 4200; (2) Slowly add an organotin catalyst into the reaction kettle, add antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring, with a rotation speed of 200 - 300 rpm, and the reaction time is 2 - 3 hours to obtain a modified polycaprolactone system; (3) Add polyethyleneimine into the modified polycaprolactone system, heat it to 160 - 180 °C, continue the reaction for 1 - 2 hours, add stearic acid as a terminator to terminate the reaction, cool the reaction system to room temperature, and remove xylene by vacuum distillation to obtain a dispersant based on caprolactone and polyethyleneimine.
2. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 1, characterized in that, The preparation method of the modified polycaprolactone system includes the following steps: by weight, (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 60 - 70 parts of caprolactone monomer and 10 - 20 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.05 - 0.1 part of an organotin catalyst into the reaction kettle, add 0.01 - 0.05 part of antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring, with a rotation speed of 200 - 300 rpm, and the reaction time is 2 - 3 hours to obtain a modified polycaprolactone system.
3. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 2, characterized in that, The rotation speed of stirring is 200 - 300 rpm.
4. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 3, characterized in that, Polyhydroxystearic acid is a mixture of polyhydroxystearic acid with a molecular weight of 550 - 600, polyhydroxystearic acid with a molecular weight of 1200 - 1300, and polyhydroxystearic acid with a molecular weight of 2000 - 2100 in a weight ratio of 1:1.2 - 1.4:0.5 - 0.
7.
5. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 4, characterized in that, The weight ratio of polyethyleneimine to caprolactone monomer is 0.2 - 0.4:6 - 7.
6. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 1, characterized in that, The addition amount of the terminator is 1% - 2% of the total weight of the raw materials.
7. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 5, characterized in that, In the step (1), a phosphate monomer is also included, specifically: (1) Add 100 parts of xylene into a dry reaction kettle, introduce an inert gas to remove air, ensure an anhydrous and anaerobic environment, add 60 - 70 parts of caprolactone monomer, 15 - 20 parts of phosphate monomer and 10 - 20 parts of polyhydroxystearic acid, and stir evenly; (2) Slowly add 0.05 - 0.1 part of an organotin catalyst into the reaction kettle, add 0.01 - 0.05 part of antioxidant BHT, heat the reaction system to 120 - 140 °C, start stirring, with a rotation speed of 200 - 300 rpm, and the reaction time is 2 - 3 hours to obtain a modified polycaprolactone system.
8. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 7, characterized in that, The phosphate monomer includes methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.3 - 1.
5.
9. The preparation method of the dispersant based on caprolactone and polyethyleneimine according to claim 8, characterized in that, The phosphate monomer includes methacrylic acid phosphate and vinyl phosphate in a weight ratio of 1:1.
4.
10. A dispersant based on caprolactone and polyethyleneimine prepared by the preparation method according to any one of claims 1 - 9.
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