An antifoaming agent composition, its preparation method and application

Abstract

This invention relates to the field of antifoaming agent compositions, and more particularly to an antifoaming agent composition, its preparation method, and its application. The antifoaming agent composition comprises a dispersing solvent, an active antifoaming agent component, a dispersing aid, and a base oil in a weight ratio of 1–50:0.0001–5:1–90:1–20; the dispersing solvent is selected from one or more of acetone, kerosene, methyl ethyl ketone, methyl isobutyl ketone, m-difluorotoluene, toluene, and cyclohexanone. The antifoaming agent composition provided by this invention exhibits excellent antifoaming properties. When added to lubricating oil, it can quickly eliminate foam generated in the lubricating oil due to mechanical agitation and other factors. Simultaneously, it solves the problem of the antifoaming agent being difficult to disperse and easily sedimenting in oil, ensuring the long-term stability of the antifoaming agent in lubricating oil, and thus solving the high-temperature stability problem. The antifoaming agent composition of this invention is suitable for application in the field of lubricating oil, especially in lubricating oils used in ultra-low viscosity electric vehicles.

Description

Technical Field

[0001] This invention relates to the field of antifoaming agent composition technology, and in particular to an antifoaming agent composition, its preparation method, and its application. Background Technology

[0002] Compared to traditional automobiles, transmission fluids for new energy vehicles need to adapt to the high-speed operating environment of the electric motor, while also requiring low viscosity to reduce churning losses and achieve energy savings. This results in ultra-low viscosity transmission fluids being prone to foaming and difficult to eliminate, making foam control a major pain point in the new energy vehicle transmission fluid industry. Poor foam control can lead to oil overflow during operation, and more seriously, poor foam performance can result in poor oil film integrity, leading to hardware wear. Simultaneously, poor anti-foaming performance can affect the oil's insulation properties. Solving the foam problem relies on anti-foaming agent technology. However, current anti-foaming agent technology faces challenges such as high-performance anti-foaming agents being difficult to disperse and prone to sedimentation in lubricating oils, exhibiting poor long-term storage stability, and resulting in poor high-temperature anti-foaming performance.

[0003] Domestic and international researchers have made some fruitful progress in the field of antifoaming agents, but some technical problems remain unresolved. For example, CN 104232246 B discloses a lubricating oil composite antifoaming agent, which solves the shortcomings in high-temperature foaming performance, but fails to address the long-term stability issue of the antifoaming agent. US13620190284501A1 discloses a dispersion method for an antifoaming agent, which improves antifoaming performance, but fails to solve the shortcomings in high-temperature antifoaming performance.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an antifoaming composition, its preparation method, and its application. The antifoaming composition developed by this invention exhibits strong antifoaming properties, high-temperature antifoaming properties, and greater stability in lubricating oils.

[0006] Specifically, the present invention explored the causes of the above-mentioned technical problems and found that the preferred antifoaming agent composition and the use of appropriate components and proportions can effectively achieve the physical separation of the antifoaming agent, avoid the aggregation of antifoaming agent particles, and enable the antifoaming agent composition to have high efficiency antifoaming performance and good high temperature antifoaming performance in lubricating oil, and effectively disperse in lubricating oil to achieve reliable long-term storage stability.

[0007] In a first aspect, the present invention provides a novel antifoaming composition comprising: a dispersing solvent, an antifoaming active ingredient, a dispersing aid, and a base oil in a weight ratio of 1–50:0.0001–5:1–90:1–20.

[0008] This invention combines specific dispersants, dispersants, base oils, and effective antifoaming agents to obtain an antifoaming composition with high-efficiency antifoaming properties and good high-temperature performance. Through process design, the composition is fully dispersed, which can effectively achieve the dispersibility of the antifoaming agent in the lubricating oil system and reliable long-term storage stability.

[0009] Preferably, the weight ratio of the dispersing solvent, the antifoaming agent active ingredient, the dispersing aid, and the base oil is 1-50:0.0003-3:2-70:5-15.

[0010] Preferably, the dispersing solvent is selected from one or more of acetone, kerosene, methyl ethyl ketone, methyl isobutyl ketone, m-difluorotoluene, toluene, and cyclohexanone.

[0011] Preferably, the active ingredient of the antifoaming agent is selected from one or more of the following: methacrylate-acrylate copolymer, polyethylene glycol ether-fatty alcohol-polybutylene glycol ether copolymer, polydimethylsiloxane, polyether and fluorinated ester co-modified silicone oil, and polysiloxane containing branched carbon-fluorine structure.

[0012] Preferably, the polysiloxane containing a branched fluorocarbon structure has the structure shown in formula (I):

[0013]

[0014] Where R is C1-C 22 Straight-chain alkanes, x = 1–90, y = 1–30, z = 10–22.

[0015] Preferably, the polyether and fluorinated ester co-modified silicone oil has the structure shown in formula (II):

[0016]

[0017] Where m = 1 to 90, n = 1 to 20, and p = 1 to 20.

[0018] Preferably, the dispersing agent is selected from one or more of the following: alkylamine friction modifier, thiophosphate amine salt extreme pressure anti-wear agent, polymethyl methacrylate pour point depressant, polyacrylate viscosity index improver, polyisobutylene bis(succinimide) (T154) dispersant, and alkyl salicylate calcium (T106) detergent.

[0019] Preferably, the base oil is selected from one or more of mineral base oils, vegetable oils, polyalphaolefin synthetic base oils, polyol ester synthetic base oils, polyalkylene glycols, and diester synthetic base oils.

[0020] Preferably, the surface tension of the effective component of the antifoaming agent is 15-30 Nm / m, and more preferably 20-25 Nm / m.

[0021] Preferably, the kinematic viscosity of the dispersant at 100°C is 20–300 cSt, more preferably 50–200 cSt.

[0022] Secondly, the present invention also provides a method for preparing the above-mentioned antifoaming agent composition. Specifically, the method for preparing the antifoaming agent composition provided by the present invention includes the following steps:

[0023] 1) Dissolve the active ingredient of the antifoaming agent in the dispersion solvent to obtain a clear and transparent component A;

[0024] 2) The clear and transparent component A, the dispersant and the base oil are mixed in proportion and then ground and cooled to room temperature to obtain an antifoaming composition.

[0025] The present invention has found that by using the above-mentioned specific mixing method, the dispersion stability of the antifoaming agent composition in the system can be further ensured, which is beneficial to improving the antifoaming performance, high-temperature antifoaming performance and long-term storage stability of the antifoaming agent composition.

[0026] Preferably, in step (2), the grinding is carried out at 30–100°C for 0.1–1 hour;

[0027] Preferably, in step (2), the grinding process is performed 1 to 6 times, preferably 2 times;

[0028] Preferably, in step (2), the mixing is carried out in one or more of the following: a mixing tank, a colloid mill, and a high-speed homogenizer. Based on the selection of the specific dispersing aids, dispersing solvents, base oils, and effective components of the antifoaming agent, this invention utilizes a design employing a colloid mill and a high-speed homogenizer for thorough dispersion, thereby achieving more effective dispersibility and reliable long-term storage stability of the antifoaming agent in the lubricating oil system.

[0029] In this invention, the mixing in steps (1) to (2) using the specific method described above is more conducive to the dispersion of the antifoaming agent composition, thereby improving its dispersion degree in the system and achieving high-efficiency antifoaming performance, high-temperature antifoaming performance and reliable long-term storage stability.

[0030] Thirdly, the present invention also provides the application of the described antifoaming composition or the method for preparing the described antifoaming composition in the field of lubricating oils, preferably in the application of ultra-low viscosity lubricating oils for electric vehicles. The antifoaming composition of the present invention has excellent application effects in the field of lubricating oils, especially in the application of ultra-low viscosity lubricating oils for electric vehicles.

[0031] This invention prepares a high-performance antifoaming agent composition through a specific composition and preparation process. The invention's preparation method achieves effective dispersion of the antifoaming agent, solving the problems of poor dispersion and sedimentation, and ensuring long-term storage stability in lubricating oils. It also addresses the issue of poor high-temperature antifoaming performance. The beneficial effects of this invention are at least as follows:

[0032] 1) The antifoaming agent composition and preparation method provided by the present invention can achieve full dispersion when used in lubricating oil, so that the lubricating oil has high-efficiency antifoaming performance, high-temperature antifoaming performance and reliable long-term storage stability, thus solving the problem of difficult foam control of lubricating oil.

[0033] 2) The antifoaming agent composition provided by the present invention does not change the antifoaming agent particles after long-term storage. Its antifoaming performance and high-temperature antifoaming performance in lubricating oil are not affected. It solves the problem that antifoaming agents are prone to precipitation and stratification during storage, which leads to the failure of antifoaming agent performance. Detailed Implementation

[0034] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0035] Example 1

[0036] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 1:0.0001:1:1. The dispersing solvent is kerosene; the active antifoaming ingredient is polydimethylsiloxane with a surface tension of 15 Nm / m; the dispersing aid is an amine thiophosphate extreme pressure anti-wear agent with a kinematic viscosity of 300 cSt at 100°C; and the base oil is mineral oil HVI III4.

[0037] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0038] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0039] (2) Mix the clear transparent component A, dispersant and base oil according to the ratio, grind once at 100°C using a high-speed homogenizer (10000rpm) for 0.1 hours, and cool to room temperature to obtain the antifoaming composition.

[0040] Example 2

[0041] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 50:5:90:20. The dispersing solvent is kerosene; the active antifoaming ingredient is a polysiloxane containing a branched fluorocarbon structure with a surface tension of 30 Nm / m and the following structure; the dispersing aid is a thiophosphate amine salt extreme pressure anti-wear agent with a kinematic viscosity of 20 cSt at 100°C; and the base oil is polyalphaolefin synthetic base oil PAO4.

[0042] Polysiloxanes containing branched fluorocarbon structures have the following structure:

[0043]

[0044] Where R is C 22 Straight-chain alkanes, x = 1, y = 1, z = 10.

[0045] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0046] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0047] (2) After mixing the clear transparent component A, dispersant and base oil according to the ratio, grind them 6 times for 1 hour at 30°C using a high-speed homogenizer (10000rpm), and cool to room temperature to obtain the antifoaming composition.

[0048] Example 3

[0049] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 20:0.0003:2:5. The dispersing solvent is methyl ethyl ketone; the active antifoaming ingredient is a methacrylate-acrylate copolymer with a surface tension of 25 Nm / m; the dispersing aid is a polyisobutylene succinimide dispersant with a kinematic viscosity of 200 cSt at 100°C; and the base oil is a polyalkylene glycol.

[0050] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0051] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0052] (2) Mix the clear and transparent component A, the dispersant and the base oil according to the ratio, grind them twice at 80°C using a colloid mill for 0.5 hours, and cool to room temperature to obtain the antifoaming composition.

[0053] Example 4

[0054] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 20:3:70:15. The dispersing solvent is methyl isobutyl ketone; the active antifoaming ingredient is a polysiloxane containing a branched fluorocarbon structure with a surface tension of 20 Nm / m and the following structure; the dispersing aid is a polymethyl methacrylate pour point depressant with a kinematic viscosity of 50 cSt at 100°C; and the base oil is a polyol ester synthetic base oil.

[0055] Polysiloxanes containing branched fluorocarbon structures have the following structure:

[0056]

[0057] Where R is a C8 straight-chain alkane, x = 90, y = 30, z = 22

[0058] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0059] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0060] (2) Mix the clear and transparent component A, the dispersant and the base oil according to the ratio, grind them twice at 80°C using a colloid mill for 0.5 hours, and cool to room temperature to obtain the antifoaming composition.

[0061] Example 5

[0062] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 20:0.002:70:9.998. The dispersing solvent is m-difluorotoluene; the active antifoaming ingredient is polyether and fluorinated ester co-modified phenyl hydrogen silicone oil with a surface tension of 15 Nm / m and the following structure; the dispersing aid is alkyl salicylate calcium T106 detergent with a kinematic viscosity of 150 cSt at 100°C; and the base oil is a diester synthetic base oil.

[0063] Polyether and fluorinated ester co-modified phenyl hydrogen silicone oil has the structure shown in the following formula:

[0064]

[0065] Where m = 1, n = 1, p = 1.

[0066] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0067] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0068] (2) Mix the clear and transparent component A, the dispersant and the base oil according to the ratio, grind them twice at 70°C using a colloid mill for 0.5 hours, and cool to room temperature to obtain the antifoaming composition.

[0069] Example 6

[0070] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 1:0.001:50:10. The dispersing solvent is acetone; the active antifoaming ingredient is polyether and fluorinated ester co-modified phenyl hydrogen silicone oil with a surface tension of 15 Nm / m; the dispersing aid is molybdenum dithiophosphate friction modifier with a kinematic viscosity of 300 cSt at 100°C; and the base oil is vegetable oil.

[0071] Polyether and fluorinated ester co-modified phenyl hydrogen silicone oil has the structure shown in the following formula:

[0072]

[0073] Where m = 90, n = 20, p = 20.

[0074] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0075] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0076] (2) Mix the clear transparent component A, dispersant and base oil according to the ratio, grind once at 100°C using a high-speed homogenizer for 0.1 hours, and cool to room temperature to obtain the antifoaming composition.

[0077] Comparative Example 1

[0078] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, and the base oil is 20:0.002:79.998. The dispersing solvent is m-difluorotoluene, the active antifoaming ingredient is polyether and fluorinated ester co-modified phenyl hydrogen silicone oil with a surface tension of 15 Nm / m and the following structure; the base oil is a diester synthetic base oil.

[0079] Polyether and fluorinated ester co-modified silicone oils have the structure shown in the following formula:

[0080]

[0081] Where m = 1, n = 1, p = 1.

[0082] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0083] (1) Dissolve the active ingredient of the antifoaming agent in a dispersion solvent to obtain a clear and transparent component A.

[0084] (2) After mixing the clear and transparent component A and the base oil according to the ratio, grind them twice at 70°C using a colloid mill for 0.5 hours, and then cool them to room temperature to obtain the antifoaming composition.

[0085] Comparative Example 2

[0086] This embodiment provides an antifoaming composition, comprising: a dispersing solvent, an active antifoaming ingredient, a dispersing aid, and a base oil. The weight ratio of the dispersing solvent, the active antifoaming ingredient, the dispersing aid, and the base oil is 20:0.002:70:9.998. The dispersing solvent is m-difluorotoluene; the active antifoaming ingredient is polyether and fluorinated ester co-modified phenyl hydrogen silicone oil with a surface tension of 15 Nm / m and the following structure; the dispersing aid is alkyl salicylate calcium detergent with a kinematic viscosity of 150 cSt at 100°C; and the base oil is a diester synthetic base oil.

[0087] Polyether and fluorinated ester co-modified phenyl hydrogen silicone oil has the structure shown in the following formula:

[0088]

[0089] Where m = 1, n = 1, p = 1.

[0090] This embodiment also provides a method for preparing the above-mentioned antifoaming agent composition, including the following steps:

[0091] The components are added directly to the oil in the specified proportions and then subjected to simple mechanical stirring.

[0092] Experimental Example 1

[0093] This experimental example focuses on the antifoaming agent compositions of Examples 1-6 and Comparative Examples 1 and 2. The antifoaming agent compositions were applied to lubricating oils, and the oils were blended using the pulse blending method commonly used in lubricating oils. The foaming performance of the lubricating oils was evaluated using GB / T 12579 "Evaluation Method for Foaming Characteristics of Lubricating Oils," and the high-temperature foaming performance of the lubricating oils was evaluated using SH / T 0722 "Determination Method for High-Temperature Foaming Characteristics of Lubricating Oils." After high-speed centrifugation at 1280 rpm for 3 hours, the foaming performance of the upper layer of the oil was evaluated using GB / T 12579 and SH / T 0722 to assess the stability of the antifoaming agent in the oil after long-term storage. The sedimentation of the antifoaming agent was evaluated by observing the bottom of the centrifuge tubes, and the silicon content in the oil was determined using GB / T 17476 inductively coupled plasma atomic emission spectrometry.

[0094] The foam performance evaluation was conducted using four procedures: 24℃, 93.5℃, post-24℃, and 150℃. Procedure I (24℃) represents the volume of foam on the oil surface at the end of the blowing cycle at 24℃; Procedure II (93.5℃) represents the volume of foam on the oil surface at the end of the blowing cycle at 93.5℃; Procedure III (post-24℃) represents the volume of foam on the oil surface at the end of the blowing cycle at 24℃ after the oil treated at 93.5℃; and Procedure IV (150℃) represents the volume of foam on the oil surface at the end of the blowing cycle at 150℃. Lower values ​​indicate better foam performance.

[0095] As shown in Table 1, the oils processed using different dispersants, antifoaming agents, dispersing solvents, and base oils according to the dispersion process in Examples 1-6 exhibited excellent antifoaming properties, particularly at 150°C. Furthermore, the Si content in the oils remained relatively well after high-speed centrifugation. In contrast, the oils in Comparative Examples 1 and 2 showed poorer antifoaming properties at 150°C and exhibited precipitation problems due to the release of the antifoaming agent. This demonstrates that the proposed solution of this invention has good high-temperature foam control and stability, achieving excellent long-term stability.

[0096] Table 1. Results of oil foaming performance tests in Examples 1-6 and Comparative Examples 1 and 2.

[0097]

[0098] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An antifoaming agent composition, comprising: The dispersing solvent, antifoaming active ingredient, dispersing aid, and base oil are present in a weight ratio of 1~50:0.0001~5:1~90:1~20. The dispersing agent is selected from one or more of friction modifiers, extreme pressure anti-wear agents, pour point depressants, viscosity index improvers, dispersants, and detergents; the kinematic viscosity of the dispersing agent at 100°C is 20–300 cSt. The method for preparing the antifoaming agent composition includes the following steps: (1) Dissolve the effective component of the antifoaming agent in the dispersion solvent to obtain a clear and transparent component A; (2) The clear and transparent component A, the dispersant and the base oil are mixed in the specified proportions and then ground. After cooling to room temperature, an antifoaming composition is obtained. The active ingredient of the antifoaming agent is selected from one or more of the following: methacrylate-acrylate copolymer, polydimethylsiloxane, polyether and fluorinated ester co-modified phenyl hydrogen silicone oil, and polysiloxane containing branched carbon-fluorine structure.

2. The antifoaming composition according to claim 1, characterized in that, The weight ratio of the dispersing solvent, the antifoaming agent active ingredient, the dispersing aid, and the base oil is 1~50:0.0003~3:2~70:5~15.

3. The antifoaming agent composition according to claim 2, characterized in that, The dispersing solvent is selected from one or more of acetone, kerosene, methyl ethyl ketone, methyl isobutyl ketone, m-difluorotoluene, toluene, and cyclohexanone; and / or, The base oil is selected from one or more of the following: mineral oil, vegetable oil, polyalphaolefin synthetic base oil, polyol ester synthetic base oil, polyalkylene glycol, and diester synthetic base oil.

4. The antifoaming composition according to claim 1, characterized in that, The polysiloxane containing a branched fluorocarbon structure has the structure shown in formula (I): （I） In equation (I), R represents C1 to C2. 22 The divalent straight-chain alkane group, x=1~90, y=1~30, z=10~22; And / or, the polyether and fluorinated ester co-modified phenyl hydrogen silicone oil has the structure shown in formula (II): (II) In equation (II), m = 1~90, n = 1~20, and p = 1~20.

5. The antifoaming composition according to any one of claims 1-4, characterized in that, The surface tension of the active ingredient in the antifoaming agent is 15–30 Nm / m.

6. The antifoaming composition according to claim 5, characterized in that, The surface tension of the active ingredient in the antifoaming agent is 20–25 Nm / m.

7. The antifoaming composition according to any one of claims 1-4, characterized in that, The kinematic viscosity of the dispersant at 100°C is 50–200 cSt.

8. A method for preparing the antifoaming composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Dissolve the effective component of the antifoaming agent in the dispersion solvent to obtain a clear and transparent component A; (2) The clear and transparent component A, the dispersing agent and the base oil are mixed in proportion and then ground and cooled to room temperature to obtain an antifoaming composition.

9. The method for preparing the antifoaming composition according to claim 8, characterized in that, In step (2), the grinding is carried out at 30-100°C for 0.1-1 hours per cycle; And / or, in step (2), the grinding process is performed 1 to 6 times; And / or, in step (2), the mixing is carried out in one or more of the following: a mixing vessel, a colloid mill, and a high-speed homogenizer.

10. The use of the antifoaming composition according to any one of claims 1 to 7 or the antifoaming composition prepared by the method of preparation of the antifoaming composition according to claim 8 or 9 in the field of lubricating oil.

11. The application of the antifoaming composition according to claim 10, characterized in that, Application of the antifoaming composition in ultra-low viscosity lubricating oil for electric vehicles.

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